Inflation cylinder and inflation tool for battery blasting test

Abstract

The utility model discloses an inflation air cylinder and an inflation tool for battery blasting test, the inflation air cylinder comprises a cylinder body and a valve drawing rod, a hollow channel is arranged in the valve drawing rod, the valve drawing rod hermetically penetrates through the cylinder body and is in sliding fit with the cylinder body, a piston is sleeved outside the valve drawing rod, an inner cavity of the cylinder body is divided into an upper cavity and a lower cavity by the piston, and the cylinder body is provided with an inflation inlet. The end, close to the upper cavity, of the valve drawing rod is an air inlet end, the end, close to the lower cavity, of the valve drawing rod is an air outlet end, the air inlet end is connected with an inflation device, the air outlet end is connected with a rubber sleeve, and the rubber sleeve is connected with a battery anti-explosion valve. The battery anti-explosion device has the beneficial effects that the battery is inflated through the inflating cylinder, the battery is fixed through the fixing clamp, and the valve drawing rod of the inflating cylinder wraps the battery anti-explosion valve through the rubber sleeve, so that quick connection or disassembly can be realized, and the battery anti-explosion device is convenient to mount. And the rubber sleeve can be tightly pressed on a battery shell or a cover plate by inflating the upper cavity of the cylinder body, so that the sealing between the valve drawing rod and the battery is realized, and the sealing performance is good.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, specifically to an inflatable cylinder and inflatable fixture for battery explosion testing. Background Technology

[0002] With the rapid development of battery technology, the requirements for battery safety are becoming increasingly stringent. Battery leakage and abnormal airtightness have always been top concerns in the lithium-ion battery industry. To comprehensively assess battery safety, the industry typically conducts breathing and explosion tests on batteries. Furthermore, during battery manufacturing and inspection, safety verification is required for various factors, including the battery casing, cover plate, structural component welding, leakage, and explosion-proof valves. Traditional breathing and explosion-proof machines usually pressurize the explosion-proof valve of the battery cover plate and are equipped with specialized clamps. However, when pressurizing the battery, a method of plugging and sealing the explosion-proof valve is commonly used. This involves breaking the explosion-proof valve, inserting an inflation tube into the valve, and sealing the tube with sealant. The battery is then placed in an explosion-proof cabinet, and air is injected into the battery through the inflation tube to conduct the explosion test. This method requires cutting the high-pressure nylon air tube from the glue application point after each inspection, which damages the air tube and increases inspection costs. It also requires high air pressure at the glue application point and certain glue application techniques. In addition, each inspection requires applying glue and waiting for it to solidify, which takes a long time. The glue application point is also prone to cracking, resulting in a low first-time pass rate. It is also quite dangerous to observe abnormalities in the product. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an inflation cylinder and inflation fixture for battery explosion testing. The inflation cylinder inflates the battery, and a fixing clamp secures the battery. The valve rod of the inflation cylinder is wrapped with a rubber sleeve around the battery's explosion-proof valve, allowing for quick connection and disassembly, and is easy to install. Furthermore, by inflating the upper cavity of the cylinder, the rubber sleeve is pressed tightly against the battery casing or cover, achieving a good seal between the valve rod and the battery.

[0004] The purpose of this utility model is achieved through the following technical measures: a gas-filling cylinder for battery explosion testing, comprising a cylinder body and a valve rod with an internal hollow channel, the valve rod sealingly penetrating the cylinder body and slidingly engaging with the cylinder body, a piston being fitted around the valve rod, the piston dividing the internal cavity of the cylinder body into an upper cavity and a lower cavity, the cylinder body having a gas inlet, the gas inlet communicating with the upper cavity, the end of the valve rod near the upper cavity being the gas inlet, the end of the valve rod near the lower cavity being the gas outlet, the gas inlet being connected to a gas-filling device, and the gas outlet being connected to a rubber sleeve, the rubber sleeve being connected to a battery explosion-proof valve.

[0005] In some embodiments, the intake end of the valve stem is also connected to a pressure gauge.

[0006] In some embodiments, the cylinder block is further provided with a fluororubber gasket at the through hole of the valve stem.

[0007] In some embodiments, the cylinder body includes a cylinder wall, and a top cover and a bottom cover are respectively provided at both ends of the cylinder wall. A sealing ring is provided between the top cover and the cylinder wall and between the bottom cover and the cylinder wall.

[0008] In some embodiments, buffer pads are provided between the top cover and the cylinder wall, and between the bottom cover and the cylinder wall.

[0009] An inflation fixture for battery explosion testing includes an inflation cylinder and a fixing clamp, wherein the fixing clamp is used to fix the battery.

[0010] In some embodiments, the fixing clamp includes a base and a cover plate, the base and the cover plate are connected by telescopic legs, a battery insulation clamp is disposed between the base and the cover plate, and the cover plate is provided with an explosion-proof valve protrusion.

[0011] In some embodiments, a lower insulating plate is provided above the base, and an upper insulating plate is provided below the cover plate. The upper insulating plate is provided with a through hole corresponding to the exposed opening of the explosion-proof valve.

[0012] In some embodiments, the lower insulating plate has one or more lower battery holders, and the upper insulating plate has one or more upper battery holders corresponding to the lower battery holders.

[0013] In some embodiments, the top of the cover plate is provided with a movable slide rail, a trolley is provided on the movable slide rail, and an inflation cylinder is fixed on the trolley.

[0014] Compared with existing technologies, the advantages of this utility model are as follows: This utility model provides an inflation cylinder and inflation fixture for battery explosion testing. The inflation cylinder inflates the battery via a valve rod, which wraps around the battery's explosion-proof valve with a rubber sleeve, allowing for quick connection and disassembly, and convenient installation. Furthermore, inflation into the upper cavity through the cylinder's inflation port causes the valve rod to move downwards via a piston, pressing the rubber sleeve tightly against the battery casing or cover, achieving a good seal between the valve rod and the battery. The inflation fixture provided by this utility model can also integrate the inflation cylinder onto a fixing clamp, allowing the fixture to be placed directly in liquid for observation of battery leakage. The inflation fixture of this utility model can be adjusted by changing the length of the telescopic legs to test different battery models, increasing the fixture's applicability. The rubber sleeve of this invention can be reused, avoiding damage to the inflation tube, reducing the inspection loss rate, and lowering the inspection cost. Compared with the existing tube plugging and glue application method, which does not have a special clamp to support the battery, this invention uses a fixing clamp to fix the battery, which can reduce the risk of explosion during inspection.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the split structure of the cylinder of this utility model.

[0017] Figure 2 This is a structural schematic diagram of the fixing clamp of this utility model.

[0018] Figure 3 This is a schematic diagram of the split structure of the inflatable tool of this utility model.

[0019] Figure 4 This is a diagram showing the airflow direction during the pressurization and inflation of the inflatable tool of this utility model.

[0020] The components are: 1. Cylinder wall, 2. Bottom cover, 3. Top cover, 4. Valve rod, 5. Piston, 6. Inlet, 7. Rubber sleeve, 8. Buffer pad, 9. Sealing ring, 10. Pressure gauge, 11. Cover plate, 12. Base, 13. Upper insulating plate, 14. First leg, 15. Second leg, 16. Limit pin, 17. Lower battery holder, 18. Terminal holder, 19. Sliding rail, 20. Trolley, 21. Bracket fixing plate. Detailed Implementation

[0021] like Figures 1 to 4 As shown, a battery explosion test inflation cylinder includes a cylinder body and a valve rod 4 with an internal hollow channel. The valve rod 4 is sealed through both ends of the cylinder body and slides with the cylinder body. Specifically, the valve rod 4 can move along the axial direction of the cylinder body. A piston 5 is fitted around the valve rod 4, and the piston 5 divides the internal cavity of the cylinder body into an upper cavity and a lower cavity. The cylinder body has an inflation port 6, which communicates with the upper cavity. Inflation is carried into the upper cavity through the inflation port 6, increasing the air pressure in the upper cavity, thereby pushing the piston 5 to move, which in turn moves the valve rod 4. The end of the valve rod 4 near the upper cavity is the air inlet, and the end of the valve rod 4 near the lower cavity is the air outlet. The air inlet is connected to an inflation device, and the air outlet is connected to a rubber sleeve 7, which is connected to a battery explosion-proof valve.

[0022] Further preferably, the rubber sleeve 7 can be made of fluororubber to increase resistance to electrolyte corrosion and compression rebound.

[0023] In some embodiments, the air intake end of the valve lever 4 is also connected to a pressure gauge 10. By observing the pressure changes of the pressure gauge 10, the air pressure can be directly observed, facilitating real-time monitoring of pressure changes within the battery.

[0024] In some embodiments, the cylinder body is further provided with a fluororubber gasket at the through hole of the valve stem 4. Preferably, a rigid fluororubber gasket is used, and more preferably, the fluororubber gasket has a hardness of Shore A75, to prevent air leakage and increase the service life of the cylinder.

[0025] In some embodiments, the cylinder body includes a cylinder wall 1, with a top cover 3 and a bottom cover 2 respectively provided at both ends of the cylinder wall 1, and sealing rings 9 are respectively provided between the top cover 3 and the cylinder wall 1 and between the bottom cover 2 and the cylinder wall 1.

[0026] In some embodiments, buffer pads 8 are provided between the top cover 3 and the cylinder wall 1 and between the bottom cover 2 and the cylinder wall 1, respectively. Specifically, the buffer pads 8 are located in the upper cavity and the lower cavity, respectively, and are attached to the top cover 3 and the bottom cover 2, respectively. The buffer pads can buffer the collision and wear between the piston 5 and the top cover 3 and the bottom cover 2, thereby increasing the service life.

[0027] A gas-filling fixture for battery explosion testing includes an inflation cylinder and a fixing clamp, the fixing clamp being used to fix the battery. Specifically, the fixing clamp is located below the inflation cylinder, and the inflation cylinder can be directly fixed above the fixing clamp, or it can be fixed by other support frames well known to those skilled in the art.

[0028] In some embodiments, the fixing clamp includes a base 12 and a cover plate 11, which are connected by telescopic legs. A battery insulation clamp is disposed between the base 12 and the cover plate 11, and the cover plate 11 has an exposed explosion-proof valve opening. When the battery is fixed to the fixing clamp, the rubber sleeve at the outlet of the inflation cylinder can completely cover the area of ​​the explosion-proof valve opening, thereby completely enclosing the explosion-proof valve opening and allowing gas to flow from the explosion-proof valve opening into the battery.

[0029] It should be noted that this utility model does not specifically limit the structure of the telescopic outriggers. Any outrigger structure with adjustable length known to those skilled in the art can be applied to this utility model. For example, a telescopic outrigger with the following structure can be used: The telescopic outrigger includes a first outrigger 14 and a second outrigger 15. The first outrigger 14 is slidably fitted onto the outside of the second outrigger 15. The first outrigger 14 has multiple limiting holes, and the second outrigger 15 has an elastic limiting pin, which works in conjunction with the limiting holes. The elastic limiting pin can also be replaced by a limiting pin 16, with limiting holes on both the first outrigger 14 and the second outrigger 15. The limiting pin 16 is simultaneously inserted into the limiting holes on both the first outrigger 14 and the second outrigger 15 to limit the position of the first outrigger 14 and the second outrigger 15.

[0030] In some embodiments, a lower insulating plate is provided above the base 12, and an upper insulating plate 13 is provided below the cover plate 11. The upper insulating plate 13 has a through hole corresponding to the exposed opening of the explosion-proof valve. The arrangement of the upper insulating plate 13 and the lower insulating plate avoids short circuits in the battery connection during the experiment.

[0031] In some embodiments, the lower insulating plate has one or more lower battery holders 17, and the upper insulating plate 13 has one or more upper battery holders corresponding to the lower battery holders 17, with each upper battery holder corresponding to an explosion-proof valve outlet. More preferably, the lower battery holder 17 also has a terminal post holder 18. The upper and lower battery holders 17 together form a fixed battery position, enabling simple placement and preventing battery misalignment.

[0032] In some embodiments, the top of the cover plate 11 is provided with a movable slide rail 19, and a trolley 20 is provided on the movable slide rail 19. An inflation cylinder is fixed on the trolley 20. When multiple batteries are fixed simultaneously by the fixing fixture, the movement of the trolley 20 along the movable slide rail 19 can drive the inflation cylinder to move, enabling the sequential inspection of multiple batteries. Specifically, there are two movable slide rails 19, which are arranged along the length of the fixing fixture and respectively located on both sides of the explosion-proof valve protrusion. The multiple explosion-proof valve protrusions are arranged linearly along the length of the fixing fixture. Each of the two movable slide rails 19 is provided with a trolley 20, and a bracket fixing plate 21 is provided above the two trolleys 20. The bracket fixing plate 21 is provided with an observation window for aligning with the pressure port. The inflation cylinder is mounted on the bracket fixing plate 21, and the outlet end of the valve rod 4 can pass through the observation window.

[0033] When using the inflation fixture to inflate the battery, install the battery on the lower battery holder 17, and adjust the length of the telescopic legs to clamp the battery between the upper and lower battery holders 17. Then move the trolley 20, causing it to move the inflation cylinder, aligning the rubber sleeve 7 at the outlet of the valve rod 4 with the battery's explosion-proof valve. Inflate the upper cavity through the inflation port 6, causing the piston 5 to move the valve rod 4 downwards, thus lowering the rubber sleeve 7 to cover the explosion-proof valve. Continue inflation, causing the piston 5 to move the valve rod 4 further, pressing the rubber sleeve 7 tightly against the battery casing or cover, achieving a seal between the outlet of the valve rod 4 and the battery. Finally, the inflation device inflates the battery through the valve rod 4 to conduct an explosion test. After the experiment, the upper cavity can be depressurized through the inflation port 6. The piston 5 moves the valve rod 4 upwards, and the rubber sleeve 7 disengages from the explosion-proof valve. The trolley 20 can then be moved to test the next battery.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An inflatable cylinder for battery explosion testing, characterized in that: The device includes a cylinder block and a valve stem with a hollow internal channel. The valve stem seals through the cylinder block and slides with it. A piston is fitted over the valve stem, dividing the internal cavity of the cylinder block into an upper chamber and a lower chamber. The cylinder block has an air inlet that communicates with the upper chamber. The end of the valve stem near the upper chamber is the air inlet, and the end near the lower chamber is the air outlet. The air inlet is connected to an air filling device, and the air outlet is connected to a rubber sleeve that is connected to a battery explosion-proof valve.

2. The inflatable cylinder for battery explosion testing according to claim 1, characterized in that: The valve stem intake end is also connected to a pressure gauge.

3. The inflatable cylinder for battery explosion testing according to claim 1, characterized in that: The cylinder block is also equipped with a fluororubber gasket at the through hole of the valve stem.

4. The inflatable cylinder for battery explosion testing according to claim 1, characterized in that: The cylinder body includes a cylinder wall, and a top cover and a bottom cover are respectively provided at both ends of the cylinder wall. A sealing ring is provided between the top cover and the cylinder wall, and between the bottom cover and the cylinder wall.

5. The inflatable cylinder for battery explosion testing according to claim 4, characterized in that: Buffer pads are also provided between the top cover and the cylinder wall, and between the bottom cover and the cylinder wall.

6. A gas-filling fixture for battery explosion testing, characterized in that: The invention includes the inflation cylinder and fixing clamp as described in any one of claims 1-5, wherein the fixing clamp is used to fix the battery.

7. The gas-filling fixture for battery explosion testing according to claim 6, characterized in that: The fixing fixture includes a base and a cover plate, which are connected by telescopic legs. The battery insulation is clamped between the base and the cover plate, and the cover plate has an explosion-proof valve protrusion.

8. The gas-filling fixture for battery explosion testing according to claim 7, characterized in that: A lower insulating plate is provided above the base, and an upper insulating plate is provided below the cover plate. The upper insulating plate has through holes corresponding to the exposed opening of the explosion-proof valve.

9. The gas-filling fixture for battery explosion testing according to claim 8, characterized in that: The lower insulating plate has one or more lower battery holders, and the upper insulating plate has one or more upper battery holders corresponding to the lower battery holders.

10. The gas-filling fixture for battery explosion testing according to claim 7, characterized in that: The top of the cover plate is provided with a movable slide rail, and a trolley is provided on the movable slide rail. An inflation cylinder is fixed on the trolley.

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