A battery case protection device

Abstract

The utility model relates to battery detection technical field discloses a kind of battery shell protection devices, including tool main part, for cladding and limiting battery to be detected, tool main part has the accommodating cavity compatible with the outer peripheral wall of battery to be detected, the inner wall of accommodating cavity and the surface of battery to be detected abut and adhere;Avoiding part is used to avoid and expose the convex piece of battery outer wall, the utility model is cladded compaction by tool main part and inhibits the inflation of battery side and battery upper and lower surface, avoiding part is provided in the position of explosion-proof valve and aluminium shell weld joint, to ensure that the detection effect of not affecting the leak point of explosion-proof valve, aluminium shell weld joint and peripheral weld position;By reinforcing component and cover plate component cooperate with tool main part to adapt secondary helium detection, the device is simple and practical, without major modification to equipment, installation and use are very convenient, effectively avoid battery inflation in the process of helium detection vacuumizing, and do not affect the detection accuracy of equipment.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a battery casing protection device. Background Technology

[0002] In the production process of lithium-ion batteries, the helium detection process is crucial, bearing the important responsibility of ensuring the battery's sealing and safety. The electrolyte inside lithium-ion batteries is highly corrosive and flammable. If the battery is not properly sealed, electrolyte leakage can severely impact battery performance and lifespan, and may even lead to extremely dangerous situations such as short circuits, fires, or explosions. The helium detection process can promptly and accurately detect even minute leaks in the battery, providing a solid and reliable guarantee for battery quality and safe use.

[0003] In lithium battery production, the commonly used helium detection method is the vacuum pressure method. While relatively complex, this method achieves high precision. Specifically, the battery under test is first placed in a vacuum-sealed chamber, providing a relatively independent and stable environment for testing. This chamber is tightly connected to an auxiliary evacuation system and a helium mass spectrometer leak detector. The battery's charging port is led out of the vacuum chamber via a connecting pipe and then connected to a helium source. When testing begins, the auxiliary evacuation system quickly removes air from the vacuum chamber, creating a vacuum. Helium is then introduced into the battery through the connecting pipe. If a leak is present, helium quickly enters the vacuum chamber through the leak and then into the helium mass spectrometer leak detector. By detecting the incoming helium, the leak detector accurately determines whether a leak exists and its extent. This vacuum pressure method has significant advantages; its detection sensitivity is extremely high, capable of detecting even the smallest leaks. At the same time, it can also detect the leakage rate of batteries under any working pressure, and can truly and accurately reflect the actual leakage state of the tested battery, providing reliable data for battery quality assessment.

[0004] However, in the current production process of power lithium batteries, the battery is placed in a vacuum environment during the first and second helium testing processes. During the helium testing, the internal pressure of the battery is greater than the external pressure. The battery will expand and deform due to the internal pressure, causing the aluminum shell side, i.e. the two large surfaces of the battery, to expand. This expansion of the internal space of the battery will have an adverse effect on the battery during the liquid injection and formation process, resulting in the product failing to meet the process and quality requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a battery casing protection device to solve the problems in the prior art. Without affecting the accuracy of the test results, it can effectively avoid appearance quality problems such as expansion and deformation of lithium batteries caused by vacuuming during helium testing. It is also highly applicable, operates well, has stable performance, and is easy to maintain and operate.

[0006] This utility model provides a battery casing protection device, including: The fixture body is used to cover and limit the battery to be tested. The fixture body has a receiving cavity adapted to the outer peripheral wall of the battery to be tested. The inner wall of the receiving cavity abuts and fits against the surface of the battery to be tested. An obstacle avoidance section is provided on the side of the tooling body facing the receiving cavity, used to avoid and expose the protrusions on the outer wall of the battery to be inspected.

[0007] In the battery casing protection device described above, preferably, the tooling body includes a base plate, a left side plate and a right side plate symmetrically arranged along the long side of the base plate, and the base plate, the left side plate and the right side plate together form the receiving cavity.

[0008] In the battery casing protection device described above, preferably, the bottom plate, the left side plate, and the right side plate are integrally formed.

[0009] In the battery casing protection device described above, preferably, a vacuum pre-drilled hole is provided on the base plate for connecting the vacuum pipeline of a primary helium detection device.

[0010] In the battery casing protection device described above, preferably, the protrusion includes a functional part and / or a welded part of the side plate of the battery to be inspected, and the clearance part includes any one or more combinations of grooves, holes, notches or hollow structures adapted to the protrusion.

[0011] In the battery housing protection device described above, preferably, the battery housing protection device further includes a reinforcement component and a cover plate assembly. The reinforcement component is fixed to the outside of the tooling body and is adapted to the outer periphery of the tooling body. The cover plate assembly is used to cover the opening side of the accommodating cavity and is detachably connected to the reinforcement component.

[0012] In the battery casing protection device described above, preferably, the cover assembly includes an inner cover and an outer cover, the inner cover being opposite to the base plate and used to adhere to and press against the surface of the battery to be inspected, and the inner cover and the outer cover being fixedly connected or integrally formed.

[0013] In the battery casing protection device described above, preferably, the material of the reinforcing component and the outer cover includes any one of aluminum alloy, stainless steel or titanium alloy.

[0014] In the battery casing protection device described above, preferably, the material of the tooling body and the inner cover includes any one of PEEK, PPS, PTFE or reinforced nylon.

[0015] Compared with existing technologies, this utility model uses the main body of the tooling to cover and compact the sides and top and bottom of the battery to suppress bulging. By providing avoidance parts at the explosion-proof valve and aluminum shell weld, it ensures that the detection effect of leaks at the explosion-proof valve, aluminum shell weld and surrounding welded areas is not affected. The reinforcement components and cover plate components cooperate with the main body of the tooling to adapt to secondary helium testing. This device is simple and practical, does not require major modifications to the equipment, and is very convenient to install and use. It effectively avoids battery bulging during the vacuuming process of helium testing without affecting the detection accuracy of the equipment. Attached Figure Description

[0016] Figure 1 This is a perspective view of Embodiment 1 provided by the present utility model; Figure 2 This is a perspective view of Embodiment 1 provided by an embodiment of the present invention from another direction; Figure 3 This is a perspective view of Embodiment 2 provided by the present invention; Figure 4 This is a perspective view of Embodiment 2 provided by the present invention from another direction.

[0017] Explanation of reference numerals in the attached figures: 10. Tooling body; 100. Base plate; 101. Left side plate; 102. Right side plate; 11. Receiving cavity; 20. Explosion-proof valve anti-cavitation groove; 21. Side weld anti-cavitation groove; 22. Vacuuming pre-reserved hole; 30. Reinforcing component; 31. Cover plate assembly; 310. Inner cover; 311. Outer cover; 32. Assembly hole. Detailed Implementation

[0018] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] Example 1 See Figure 1-2 As shown, a battery casing protection device includes a tooling body 10 and a clearance portion, wherein: The fixture body 10 is used to cover and limit the battery to be tested. The fixture body 10 has a receiving cavity 11 that is adapted to the outer peripheral wall of the battery to be tested. The inner wall of the receiving cavity 11 abuts against and fits the surface of the battery to be tested. A clearance section is provided on the side of the fixture body 10 facing the receiving cavity 11 to avoid and expose the protrusions on the outer wall of the battery to be tested. When a vacuum is drawn into the chamber of the helium testing equipment to detect the helium composition, the pressure difference between the inside and outside of the battery will cause the large surface and sides of the battery to bulge and deform. In the embodiment provided in this application, when performing helium testing, the fixture body 10 contacts and fixes the battery to be tested, and the inner wall of the receiving cavity 11 adheres to and abuts against the surface of the battery to be tested, playing a certain role in fixing and limiting it, thereby suppressing the expansion and deformation of the aluminum shell of the battery to be tested during vacuuming.

[0020] In some embodiments of this application, see Figure 1 As shown, the fixture body 10 includes a base plate 100, a left side plate 101 and a right side plate 102 symmetrically arranged along the long side of the base plate 100. The base plate 100, left side plate 101 and right side plate 102 together form a receiving cavity 11. The opening side of the receiving cavity 11 is flush with the battery to be tested. During a helium test, the helium testing equipment has a sealing plate inside the box, which can be used to press against the large surface of the battery to be tested. Therefore, the fixture body 10 can wrap the two large surfaces and two narrow sides of the battery by cooperating with the base plate 100, left side plate 101, right side plate 102 and sealing plate. It should be noted that the two end faces of the battery are not easily deformed. Therefore, in order to save consumables and reduce the complexity of opening the corresponding avoidance parts for the end faces, the fixture body 10 only needs to protect and limit the four sides of the battery. When the helium testing equipment is evacuated, the internal air pressure of the box decreases sharply, and there is a large pressure difference between the inside and outside of the battery. In this embodiment, the deformation of the aluminum shell of the battery can be greatly reduced by the surrounding protection of the fixture body 10.

[0021] In this embodiment, the base plate 100, the left side plate 101, and the right side plate 102 are integrally formed. The part of the accommodating cavity 11 that contacts the battery is made of a smooth plane to avoid wear on the battery. The fixture body 10 is made of PEEK material, which is wear-resistant and also avoids scratching the surface of the battery aluminum shell. The fixture body 10 can be designed according to the battery size so that the inner wall of the accommodating cavity 11 fits the outer wall of the battery, reducing the expansion space. In this embodiment, see Figure 1-2 As shown, a vacuuming pre-drilled hole 22 is provided on the base plate 100 for connecting the vacuuming pipeline of the primary helium detection equipment. The vacuuming pre-drilled hole 22 can be a circular hole, the diameter of which is adapted to the outer diameter of the vacuuming pipeline of the primary helium detection equipment. In order to prevent the vacuuming pipeline from warping at the base plate 100, a through groove extends from the circular hole to the end of the base plate 100 for accommodating the wiring of the vacuuming pipeline.

[0022] See Figure 1-2 As shown, the protrusion of the battery under test includes the explosion-proof valve and the side weld of the side plate of the battery under test. The clearance part includes at least an explosion-proof valve clearance groove 20 adapted to the shape of the explosion-proof valve and a side weld clearance groove 21 adapted to the side weld. The explosion-proof valve clearance groove 20 and the side weld clearance groove 21 are arranged opposite to each other on the left side plate 101 and the right side plate 102. One end of the explosion-proof valve clearance groove 20 extends to the opening side of the receiving groove, which facilitates the placement of the battery in the tooling body 10. The side weld clearance groove 21 extends along the length direction of the side plate. Its function is to allow the positions of the explosion-proof valve and the side weld to be detected without affecting the detection effect of the equipment on the battery sealing performance.

[0023] Example 2 See Figure 3-4 As shown, the difference from Embodiment 1 is that the battery casing protection device further includes a reinforcing component 30 and a cover plate assembly 31. The reinforcing component 30 is fixed to the outside of the tooling body 10 and is adapted to the outer periphery of the tooling body 10. The cover plate assembly 31 is used to cover the opening side of the accommodating cavity 11 and is detachably connected to the reinforcing component 30. The tooling body 10 in Embodiment 2 is the same as the tooling body 10 in Embodiment 1, and its specific structure will not be described in detail here. In Embodiment 2, the tooling body 10 also has an explosion-proof valve clearance groove 20 and a side weld clearance groove 21 adapted to the explosion-proof valve and the side weld. The difference is that the bottom plate 100 does not need to have a vacuum pre-drilling hole 22.

[0024] Secondary helium testing is the final leak detection after battery packaging. It requires a re-inspection of all batteries that passed the initial helium test. The testing frequency is higher, and the operation process is more complex, requiring frequent assembly and disassembly. Therefore, please refer to... Figure 3-4 As shown in Embodiment 2, the reinforcing component 30 strengthens the load-bearing capacity of the fixture body 10. The secondary helium detection equipment lacks a sealing plate; instead, a cover plate assembly 31 is detachably connected to the reinforcing component 30, protecting and limiting the two large and two narrow sides of the battery under test, preventing deformation of the aluminum shell during the secondary helium detection. The reinforcing component 30 is flush with the top of the fixture body 10. When the battery under test is placed in the receiving slot 11 and the cover plate assembly 31 is connected to the reinforcing component 30, the cover plate assembly 31 fits snugly against the large surface of the battery under test and the top surfaces of the reinforcing component 30 and the fixture body 10, preventing excess gaps and creating an expandable space. Multiple mounting holes 32 are provided on the opposing surfaces of the cover plate assembly 31 and the reinforcing component 30, and multiple locking components, including screws, locating pins, and studs, are used for installation and fixation.

[0025] See Figure 3As shown, in this embodiment, the cover assembly 31 includes an inner cover 310 and an outer cover 311. The inner cover 310 is opposite to the base plate 100 and is used to adhere to and press against the surface of the battery to be tested. The inner cover 310 and the outer cover 311 are fixedly connected or integrally formed. In embodiment 2, the reinforcing component 30 is fixedly connected to the tooling body 10 to avoid displacement during use, and is separately connected to the cover assembly 31 to facilitate the removal of the battery to be tested.

[0026] In some embodiments of this application, the fixture body 10 and inner cover 310, which are in contact with the battery under test, are made of PEEK material, which is wear-resistant and also avoids scratching the surface of the battery's aluminum casing. The reinforcing component 30 and outer cover 311 are made of aluminum alloy to strengthen the fixture body 10 and inner cover 310 and to prevent the PEEK material from cracking. Of course, in other embodiments, the fixture body 10 and inner cover 310 can also be made of any one of PPS, PTFE, or reinforced nylon, and the reinforcing component 30 and outer cover 311 can also be made of stainless steel or titanium alloy, etc.

[0027] Based on the above embodiments 1-2, the battery casing protection device can be used in the helium detection box for primary and secondary helium detection. According to the battery size design, the main body 10 of the primary helium detection fixture is made of PEEK material, the main body 10 of the secondary helium detection fixture and the inner cover 310 are made of PEEK material, and the reinforcing component 30 and the outer cover 311 are reinforced with aluminum alloy plate to prevent the PEEK material from cracking. The battery is placed in the box of the helium detection equipment. During the primary helium detection, the battery is pressed together with the main body 10 of the fixture through the sealing plate inside the box to prevent the battery from bulging on the top and bottom surfaces. The side of the battery contacts the inner wall of the main body 10 of the fixture to avoid the internal air pressure of the battery being greater than the external air pressure during vacuuming, which would cause the aluminum shell of the battery cell to bulge. During the secondary helium test, the top cover assembly and the reinforcement assembly 30 strengthen the main body of the tooling 10 while working together to compact the battery to be tested, preventing it from bulging and deforming on all four sides. The main body of the tooling 10 avoids the weld seams and explosion-proof valve positions on the surface of the battery aluminum shell, so that the side weld seams and explosion-proof valve positions can be detected, thus avoiding affecting the equipment's testing effect on the battery's sealing performance.

[0028] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A battery casing protection device, characterized in that, include: The fixture body is used to cover and limit the battery to be tested. The fixture body has a receiving cavity adapted to the outer peripheral wall of the battery to be tested. The inner wall of the receiving cavity abuts and fits against the surface of the battery to be tested. An obstacle avoidance section is provided on the side of the tooling body facing the receiving cavity, used to avoid and expose the protrusions on the outer wall of the battery to be inspected.

2. The battery casing protection device according to claim 1, characterized in that, The tooling body includes a base plate, a left side plate and a right side plate symmetrically arranged along the long side of the base plate, and the base plate, the left side plate and the right side plate together form the accommodating cavity.

3. The battery casing protection device according to claim 2, characterized in that, The base plate, the left side plate, and the right side plate are integrally formed.

4. The battery casing protection device according to claim 2, characterized in that, The base plate has a vacuuming pre-drilled hole for connecting the vacuuming pipeline of the primary helium detection equipment.

5. The battery casing protection device according to claim 1, characterized in that, The protrusion includes the functional part and / or welded part of the side plate of the battery to be inspected, and the avoidance part includes any one or more combinations of grooves, holes, notches or hollow structures adapted to the protrusion.

6. The battery casing protection device according to claim 2, characterized in that, The battery casing protection device further includes a reinforcement component and a cover plate assembly. The reinforcement component is fixed to the outside of the tooling body and is adapted to the outer periphery of the tooling body. The cover plate assembly is used to cover the opening side of the accommodating cavity and is detachably connected to the reinforcement component.

7. The battery casing protection device according to claim 6, characterized in that, The cover assembly includes an inner cover and an outer cover. The inner cover is opposite to the base plate and is used to adhere to and press against the surface of the battery to be tested. The inner cover and the outer cover are fixedly connected or integrally formed.

8. The battery casing protection device according to claim 7, characterized in that, The materials of the reinforcement components and the outer cover include any one of aluminum alloy, stainless steel, or titanium alloy.

9. The battery casing protection device according to claim 7, characterized in that, The material of the tooling body and the inner cover includes any one of PEEK, PPS, PTFE or reinforced nylon.

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