Battery shell air tightness detection tool

Abstract

The utility model provides a battery shell air tightness detection tool, which comprises a detection box, a support plate and a box cover, the top of the detection box is provided with the box cover, the side wall of the detection box is provided with an air tap, the air tap is connected with an external pressure maintaining machine, the bottom of the inner cavity of the detection box is vertically fixed with the support plate, and the cavity wall of the inner cavity is provided with an air tightness detection head. A spring pressing column is installed at the bottom of the box cover and comprises a spring barrel, the spring barrel is vertically fixed to the bottom of the box cover, a bottom plate is fixed to the bottom of the spring barrel, an abutting pressing rod is movably sleeved with the spring barrel, the bottom of the abutting pressing rod penetrates through the bottom plate downwards to form a pressing rod end, and a pressing rod spring is arranged at the top of the abutting pressing rod. By adopting the scheme, the short circuit of the battery caused by air leakage and water seepage can be prevented, and the quality of the battery pack is ensured. The structure is reasonable and the detection effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile detection configuration, in particular to an air tightness detection tool for a battery housing. Background Art

[0002] The battery pack is the main source of power for new energy vehicles. After the production of the battery pack is completed, a series of tests are required, including the air tightness detection of the battery housing. The air tightness detection can effectively identify whether the battery pack leaks air and the corresponding leakage points. For the air tightness detection of the battery housing, the following methods are traditionally available: 1. Manually check the appearance of the battery housing; 2. Water detection method; 3. Manually hold a ventilation and pressurization device to ventilate and maintain pressure on the battery housing. However, manual inspection of the appearance cannot effectively determine whether there is air leakage; water detection requires water injection and pressurization, and drying is also required after the detection is completed, resulting in low efficiency; when operating the manually held ventilation and pressurization device, the sealing performance cannot be guaranteed. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an air tightness detection tool for a battery housing, which can prevent the battery from short - circuiting due to air leakage and water seepage, thereby ensuring the quality of the battery pack. The structure adopted in this solution is reasonable and the detection effect is good.

[0004] To achieve the above purpose, the technical solution provided by the utility model is: an air tightness detection tool for a battery housing, which includes a detection box, and also includes a support plate and a box cover. Among them, the box cover is installed on the top of the detection box, and an air nozzle is installed on the side wall. The air nozzle is connected to an external pressure maintainer. A support plate is vertically fixed at the bottom of the inner cavity of the detection box, and an air tightness detection head is arranged on the inner cavity wall. A spring compression column is installed at the bottom of the box cover. The spring compression column includes a spring cylinder, the spring cylinder is vertically fixed at the bottom of the box cover, a bottom plate is fixed at the bottom, a contact pressure rod is movably sleeved in the spring cylinder, the bottom of the contact pressure rod passes downward through the bottom plate to form a pressure rod end, and a pressure rod spring is arranged at the top.

[0005] One side of the box cover is hinged to the detection box, and a box cover cylinder is hinged to the outer side wall of the detection box below the hinged end. A cylinder plate is fixed on the top of the box cover above the hinged end, and the piston rod of the box cover cylinder is hinged to the cylinder plate.

[0006] The top of the pressure rod spring abuts against the bottom of the box cover, and the bottom of the pressure rod spring abuts against the top of the contact pressure rod.

[0007] There are multiple air tightness detection heads, which are respectively located on the four side walls of the detection box.

[0008] There are two support plates, which are fixedly arranged in parallel at the bottom of the inner cavity of the detection box, and the support plates are provided with toothed support positions.

[0009] There are multiple air nozzles, which are respectively located on the four side walls of the detection box.

[0010] After adopting the above solution, the battery case to be detected is placed on the top of the support plate, and the cover cylinder controls the cover to close. During the closing process, the bottom of the contact pressure rod starts to contact the top of the battery case to complete the positioning of the battery case. After the battery case is positioned, the air nozzle injects gas into the box driven by an external press, and the airtight detection head starts to detect the air pressure fluctuation in the box, so as to identify whether the battery case leaks air and the approximate location of the air leak, thereby preventing the battery from short - circuiting due to air leakage and water seepage, and further ensuring the quality of the battery pack. The structure after adopting this solution is reasonable and the detection effect is good. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of the present utility model. Detailed Embodiment

[0012] The following further describes the present utility model in conjunction with all the drawings. The preferred embodiment of the present utility model is as follows. The embodiments described by referring to the drawings are exemplary and are only used to explain this patent, and should not be construed as a limitation to this patent.

[0013] In the description of this patent, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this patent.

[0014] In the description of this patent, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0015] See attached Figure 1, a battery case airtightness detection tooling according to this embodiment includes a detection box 1, and also includes a support plate 2 and a box cover 4. Among them, a box cover 4 is installed on the top of the detection box 1, and an air nozzle 5 is installed on the side wall of the detection box 1. The air nozzle 5 is connected to an external pressure maintaining machine. There are multiple air nozzles 5, which are respectively located on the four side walls of the detection box 1. A support plate 2 is vertically fixed at the bottom of the inner cavity of the detection box 1. There are two support plates 2, which are fixedly parallel to the bottom of the inner cavity of the detection box 1. The support plate 2 is provided with a toothed support position. An airtight detection head 7 is provided on the inner cavity wall of the detection box 1. There are multiple airtight detection heads 7, which are respectively located on the four side walls of the detection box 1.

[0016] A spring compression post is installed at the bottom of the box cover 4. The spring compression post includes a spring cylinder 6. The spring cylinder 6 is vertically fixed at the bottom of the box cover 4. One side of the box cover 4 is hinged to the detection box 1. A box cover cylinder 3 is hinged to the outer side wall of the detection box 1 below the hinged end. A cylinder plate is fixed to the top of the box cover 4 above the hinged end. The piston rod of the box cover cylinder 3 is hinged to the cylinder plate. A bottom plate is fixed to the bottom of the spring cylinder 6. A contact pressure rod 8 is movably sleeved in the spring cylinder 6. The bottom of the contact pressure rod 8 passes downward through the bottom plate to form a pressure rod end. A pressure rod spring 9 is provided at the top of the contact pressure rod 8. The top of the pressure rod spring 9 abuts against the bottom of the box cover 4, and the bottom of the pressure rod spring 9 abuts against the top of the contact pressure rod 8.

[0017] After adopting the above scheme, a universal ball is movably installed at the bottom of the contact pressure rod. The box cover cylinder controls the opening of the box cover. The battery case to be detected is placed on the top of the support plate. The top of the support plate is designed to be toothed, and the battery case is supported by the tooth tips to reduce the contact area of the support plate. The box cover cylinder controls the closing of the box cover. During the closing process, the bottom of the contact pressure rod starts to contact the top of the battery case. After closing in place, the pressure rod spring is compressed by force, so that the contact pressure rod is in close contact with the battery case, completing the positioning of the battery case. After the battery case is positioned, the air nozzle injects gas into the box driven by an external pressure maintaining machine. When the injected gas reaches the designed pressure, the pressure maintaining machine maintains the pressure, and the airtight detection head starts to detect the air pressure fluctuation in the box. When the air pressure in the box is stable without fluctuation, it indicates that the battery case has no air leakage. When the air pressure in a certain area is detected to fluctuate by a certain side or a certain airtight detection head, it indicates that there is an air leakage point on that side, thereby identifying whether the battery case has air leakage and the approximate location of the air leakage, preventing the battery from short-circuiting due to air leakage and water seepage, and thus ensuring the quality of the battery pack. The structure after adopting this scheme is reasonable and the detection effect is good.

[0018] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the implementation scope of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A battery housing air tightness testing tool, comprising a testing box (1), characterized in that: It also comprises a support plate (2) and a box cover (4), wherein the top of the detection box (1) is provided with a box cover (4), a side wall of the detection box (1) is provided with an air nozzle (5), the air nozzle (5) is connected to an external pressure maintaining machine, a support plate (2) is vertically fixed to the bottom of the inner cavity of the detection box (1), an airtight detection head (7) is provided on the inner cavity wall of the detection box (1), a spring pressure column is installed at the bottom of the box cover (4), the spring pressure column comprises a spring cylinder (6), the spring cylinder (6) is vertically fixed to the bottom of the box cover (4), a bottom plate is fixed to the bottom of the spring cylinder (6), a resisting pressure rod (8) is movably sleeved inside the spring cylinder (6), the bottom of the resisting pressure rod (8) passes downward through the bottom plate to form a pressure rod end, and a pressure rod spring (9) is provided at the top of the resisting pressure rod (8).

2. A battery casing air tightness detection tool according to claim 1, characterized in that: One side of the box cover (4) is hinged to the detection box (1), a box cover cylinder (3) is hinged on the outer wall of the detection box (1) below the hinged end, a cylinder plate is fixed to the top of the box cover (4) above the hinged end, and a piston rod of the box cover cylinder (3) is hinged to the cylinder plate.

3. The battery housing air tightness detection tool according to claim 1, characterized in that: The top of the pressure rod spring (9) abuts against the bottom of the box cover (4), and the bottom of the pressure rod spring (9) abuts against the top of the abutting pressure rod (8).

4. The battery housing air tightness detection tool according to claim 1, characterized in that: There are multiple airtight detection heads (7), which are respectively located on the four side walls of the detection box (1).

5. The battery housing air tightness detection tool according to claim 1, characterized in that: The support plates (2) are composed of two pieces, which are fixed in parallel to the bottom of the inner cavity of the detection box (1), and the support plates (2) are provided with tooth-shaped support positions.

6. The battery housing air tightness detection tool according to claim 1, characterized in that: There are multiple air nozzles (5), which are respectively located on the four side walls of the detection box (1).

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