A power battery electrolyte leakage test protection device

Abstract

The utility model relates to power battery technical field, specifically disclose a kind of power battery electrolyte leakage test protection device, including support frame, lifting assembly is equipped on support frame, fixed plate is equipped at the lower end of lifting assembly, N group of suction cups are equipped at the lower end of fixed plate, and the bottom of suction cup is adsorbed contact with battery pack upper cover, and negative pressure is generated to offset vacuum pressure;Avoidance cylinder is equipped at the upper end of fixed plate, and the suction force of avoidance cylinder controls the suction cup.The application solves the problem that the negative pressure of mass spectrometry test causes the deformation, depression, internal component device of power battery upper cover in the prior art, realizes the safety and nondestructive testing of vacuum mass spectrometry test.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically to a power battery electrolyte leakage test and protection device. Background Technology

[0002] During the assembly and production of power batteries, the cell casing may suffer microstructural damage due to mechanical stress from equipment or operators. Although this latent damage is difficult to identify through conventional testing methods, it can lead to the slow leakage of trace amounts of electrolyte, which in turn causes cell performance degradation, manifesting as quality problems such as abnormal voltage or excessive internal resistance.

[0003] To address the above issues, the industry currently uses vacuum mass spectrometry to detect electrolyte leaks in battery packs, ensuring battery safety and performance. By analyzing and detecting the composition of the electrolyte, irreversible damage caused by cell leakage can be prevented. Current mainstream mass spectrometers generally analyze the gas composition of battery packs by establishing a negative pressure environment of -5 kPa to -101 kPa. While this method effectively identifies electrolyte volatiles, the vacuum negative pressure testing conditions inevitably cause plastic deformation of the battery cover, especially for lightweight, thin-walled battery covers.

[0004] This technological defect creates a fundamental contradiction with testing requirements. The testing process itself becomes a new source of quality risk, causing structural damage to qualified products while simultaneously identifying problematic cells. This is particularly pronounced in the field of new energy vehicle power batteries, where structural integrity is paramount. This technological limitation means that existing testing methods cannot meet the basic requirements of non-destructive testing, while also increasing overall production costs and making it difficult to guarantee the reliability of battery packs. Utility Model Content

[0005] The present invention aims to provide a power battery electrolyte leakage test protection device to solve the problem that the existing electrolyte leakage detection process causes structural damage to the battery pack, making it difficult to meet the requirements of non-destructive testing and affecting the quality of the battery pack.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a power battery electrolyte leakage test protection device. A lifting assembly ensures stable lifting operation, and the selectable number and range of suction cups ensures more comprehensive and flexible protection for all power battery covers. A dynamic negative pressure adjustment is achieved through an avoidance cylinder to precisely counteract the vacuum pressure generated during testing, reducing damage to the battery pack from vacuum pressure, ensuring battery pack quality, and achieving true non-destructive testing. Specifically, the power battery electrolyte leakage test protection device includes a support frame with a lifting assembly on it. A fixed plate is located at the lower end of the lifting assembly, and N sets of suction cups are located at the lower end of the fixed plate. The bottom of the suction cups adheres to the battery pack cover, generating negative pressure to counteract the vacuum pressure. An avoidance cylinder is located at the upper end of the fixed plate, controlling the suction force of the suction cups.

[0008] The principles and advantages of this scheme are:

[0009] In the process of detecting electrolyte leaks, the detection process can easily cause structural damage to the battery pack. Traditional solutions often sacrifice detection sensitivity to reduce negative pressure intensity or reinforce the battery structure to resist vacuum deformation. However, this not only makes it difficult to detect potential leaks early, but also increases the weight and cost of the battery system. With the continuous increase in the energy density requirements of power batteries and the accelerating trend towards lightweight casings, existing solutions are unable to meet practical needs and are actually hindering the development of battery packs.

[0010] Therefore, this solution designs a testing device that can protect the battery structure under standard vacuum testing conditions. Without interfering with the accuracy of mass spectrometry analysis, it effectively counteracts the mechanical effects of vacuum negative pressure on the battery casing through innovative force compensation or pressure balancing, thereby achieving truly non-destructive testing.

[0011] Furthermore, it also includes a PLC system mounted on the support frame, which controls the number and range of suction cups that are activated.

[0012] Furthermore, the support frame includes multiple support columns and a crossbeam connecting the support columns, and the lifting assembly is disposed on the crossbeam.

[0013] Furthermore, the lifting assembly includes a positioning plate disposed on the crossbeam, and a synchronous lifter is provided on the positioning plate, the lower end of which is connected to the fixed plate.

[0014] Furthermore, the suction cup is a sponge suction cup, and 1≤N≤8.

[0015] Furthermore, a pressure gauge is also provided on the support frame, and the pressure gauge is electrically connected to the PLC system.

[0016] Furthermore, the support frame has a length of 1800-2000mm, a width of 1000-1600mm, and a height of 1000-1100mm.

[0017] Furthermore, reinforcing ribs are provided between the support column and the crossbeam.

[0018] Furthermore, the suction cups are spaced apart at the lower end of the fixing plate.

[0019] Furthermore, the synchronous lifting device includes two telescopic rods, a linkage rod is provided between the two telescopic rods, and a transmission gear is provided on one side of the linkage rod. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a front view of the present invention;

[0022] Figure 3 This is a top view of the present invention;

[0023] Figure 4 This is a schematic diagram of the operating state of this utility model.

[0024] The markings in the accompanying drawings include: support frame 1, support column 101, crossbeam 102, fixed foot 103, reinforcing rib 104, mounting beam 105; lifting assembly 2, positioning plate 201, synchronous lifter 202, telescopic rod 203, linkage rod 204; fixing plate 3, suction cup 4, battery pack 5, and avoidance cylinder 6. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] Example 1

[0027] This embodiment is basically as shown in the appendix. Figure 1 As shown: A power battery electrolyte leakage test protection device uses a coaxial lifter fixed on the support frame 1 and the fixed plate 3 to stabilize the parallelism between the fixed plate 3 and the battery pack 5. The sponge suction cup 4 of the fixed plate 3 is controlled by the PLC system to generate negative pressure on the top cover of the battery pack 5 to counteract the vacuum pressure during the mass spectrometer test, thereby reducing damage to the battery pack and achieving non-destructive testing while ensuring detection accuracy.

[0028] In this embodiment, the power battery electrolyte leakage test protection device includes a support frame 1 with an overall square structure, which can also be called a gantry support frame. It includes multiple support columns 101 and crossbeams 102 connecting the support columns 101. In this embodiment, four support columns 101 are provided, located at the four corners. Fixed feet 103 with a width greater than the support columns 101 are provided at the bottom of each support column 101 to improve the stability of the support frame 1. Crossbeams 102 are sequentially welded to the top of the support columns 101, and the support columns 101 are fixedly connected by the crossbeams 102, thus forming a stable support frame 1 with a certain height. In this embodiment, the length of the support frame 1 can be set to 1800-2000mm; the width to 1000-1600mm; and the height to 1000-1100mm. This allows for the protective placement of battery packs of different sizes without affecting the mass spectrometer's detection operation. Specifically, the length of support frame 1 can be set to 1800mm, the width to 1000mm, and the height to 1065mm.

[0029] A reinforcing rib 104 is welded between the support column 101 and the crossbeam 102 to further improve the stability of the support frame 1. Multiple mounting beams 105 are also welded between the two crossbeams 102 for mounting and fixing the lifting assembly 2.

[0030] The lifting assembly 2 is mounted on the support frame 1. In this embodiment, the lifting assembly 2 is mounted on the crossbeam 102. The lifting assembly 2 includes a positioning plate 201 welded to the top of the crossbeam 102. A synchronous lifter 202 is mounted on the positioning plate 201 to stabilize the parallelism between the fixed plate 3 and the battery pack 5. In this embodiment, the synchronous lifter 202 includes two telescopic rods 203, and a linkage rod 204 is provided between the two telescopic rods 203 to ensure that the telescopic rods 203 on both sides move synchronously. A transmission gear is installed on one side of the linkage rod 204 to control the synchronous up-and-down movement of the telescopic rods 203. Through holes are provided on both sides of the positioning plate 201, and the lower ends of the telescopic rods 203 pass through the through holes and can move up and down within the through holes.

[0031] As attached Figure 2As shown, a fixing plate 3 is provided at the lower end of the lifting assembly 2. In this embodiment, the fixing plate 3 is welded to the lower end of the telescopic rod 203, so that the fixing plate 3 can move up and down stably and accurately through the telescopic rod 203. N sets of suction cups 4 are detachably installed at the lower end of the fixing plate 3. By moving the fixing plate 3, the suction cups 4 are moved, so that the bottom of the suction cups 4 adsorbs and contacts the top cover of the battery pack 5, and generates negative pressure to counteract the vacuum pressure. In this embodiment, the suction cups 4 are spaced apart at the lower end of the fixing plate 3, and the suction cups 4 are sponge suction cups, used to adsorb the top cover of the power battery to counteract the deformation caused by the negative pressure test. At the same time, in this embodiment, 1≤N≤8, that is, the number of suction cups 4 can be increased or decreased according to the size of the battery pack, so as to flexibly switch the position and number of sponge suction cups.

[0032] An avoidance cylinder 6 is provided at the upper end of the fixing plate 3. The avoidance cylinder 6 controls the suction force of the suction cup 4 by adjusting the air pressure, so that the suction cup 4 can move slightly with the battery cover, but will not completely detach. This is used to dynamically balance the suction force of the suction cup and the deformation force of the vacuum negative pressure, so as to maintain the seal and avoid the deformation of the cover caused by rigid pulling.

[0033] It also includes a PLC system mounted on the support frame 1. The PLC system controls the number and range of suction cups 4 activated on the fixing plate 3, enabling more comprehensive and flexible protection for all power battery covers. A pressure gauge is also installed on the support frame 1, and the pressure gauge is electrically connected to the PLC system. The pressure gauge detects the negative pressure inside the chamber. When the negative pressure increases, the cylinder is controlled to synchronously reduce the thrust, or even reverse the pulling force to offset part of the vacuum suction, ensuring that the net pressure on the battery cover is close to atmospheric pressure.

[0034] The specific implementation process is as follows:

[0035] As attached Figure 3 As shown, before mass spectrometry analysis, the battery pack 5 is transported to the bottom of the device in the set orientation. Using the lifting remote control button, the cylinder is lowered, causing the suction cup 4 of the protection device to press firmly against the battery cover under the cylinder's push, providing pre-pressure to ensure a seal, as shown in the attached diagram. Figure 4 As shown, the cylinder sends the sponge suction cup on the fixed plate 3 to the working position, and the start test button is pressed to start the test.

[0036] When the mass spectrometer is evacuated, the battery cover will be subjected to inward suction force, which may cause it to collapse and deform. At this time, the avoidance cylinder 6 actively contracts or releases pressure, causing the suction cup 4 cover to slightly indent, so that the suction cup maintains a certain suction force and avoids excessive deformation of the cover.

[0037] In this embodiment, an avoidance cylinder ensures the suction cup remains in contact with the top cover, providing flexible reverse support rather than rigid resistance. This minimizes the impact of vacuum deformation on the battery pack during vacuum testing. Furthermore, the dynamic adjustment of the avoidance cylinder guarantees the required vacuum level for the mass spectrometer, achieving the necessary detection accuracy, while controlling the deformation of the top cover within a recoverable elastic range. This enables non-destructive testing that meets the testing requirements, ensuring the quality of the battery pack.

[0038] Example 2

[0039] In this embodiment, multiple clearance cylinders can be set in sections according to the size of the battery cover to achieve zoned control. Local deformation is detected by pressure gauges and pressure sensors. Based on the detection results, only the clearance cylinders in the deformed areas are contracted, while other areas remain fixedly supported, thereby further reducing the impact of deformation on the battery cover and ensuring that the net pressure borne by each part of the battery cover is more uniform and closer to the normal pressure state.

[0040] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A power battery electrolyte leakage test and protection device, characterized in that: The device includes a support frame, on which a lifting assembly is mounted. A fixed plate is located at the lower end of the lifting assembly, and N sets of suction cups are located at the lower end of the fixed plate. The bottom of the suction cups is in contact with the top cover of the battery pack and generates negative pressure to counteract the vacuum pressure. An avoidance cylinder is located at the upper end of the fixed plate, and the avoidance cylinder controls the suction force of the suction cups.

2. The power battery electrolyte leakage test and protection device according to claim 1, characterized in that: It also includes a PLC system mounted on the support frame, which controls the number and range of suction cups to be activated.

3. The power battery electrolyte leakage test and protection device according to claim 1, characterized in that: The support frame includes multiple support columns and a crossbeam connecting the support columns, and the lifting assembly is mounted on the crossbeam.

4. The power battery electrolyte leakage test and protection device according to claim 3, characterized in that: The lifting assembly includes a positioning plate on a crossbeam, and a synchronous lifter is provided on the positioning plate. The lower end of the synchronous lifter is connected to the fixed plate.

5. The power battery electrolyte leakage test and protection device according to claim 1, characterized in that: The suction cup is a sponge suction cup, and 1≤N≤8.

6. The power battery electrolyte leakage test and protection device according to claim 2, characterized in that: A pressure gauge is also provided on the support frame, and the pressure gauge is electrically connected to the PLC system.

7. The power battery electrolyte leakage test and protection device according to claim 1, characterized in that: The support frame has a length of 1800-2000mm, a width of 1000-1600mm, and a height of 1000-1100mm.

8. The power battery electrolyte leakage test and protection device according to claim 3, characterized in that: Reinforcing ribs are also provided between the support column and the crossbeam.

9. The power battery electrolyte leakage test and protection device according to claim 1, characterized in that: The suction cups are spaced apart at the lower end of the fixed plate.

10. The power battery electrolyte leakage test and protection device according to claim 4, characterized in that: The synchronous lifting device includes two telescopic rods, a linkage rod between the two telescopic rods, and a transmission gear on one side of the linkage rod.

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