Equipment and device for detecting sealing performance of lower shell of power battery

Abstract

The invention discloses power battery lower shell sealing performance detection equipment and a detection device. The power battery lower shell sealing performance detection equipment comprises a pressing table, a pressing plate and a pressing air cylinder. One end of the pressing plate is connected with the piston rod, and the other end of the pressing plate is provided with a through hole; the pressing table is arranged on the lower side of the pressing plate, the side wall of the pressing table is connected with inflation equipment through a connector, an air outlet hole is formed in the top of the pressing table and corresponds to the penetrating hole, the power battery lower shell is arranged between the pressing plate and the pressing table, and clamping and pressing acting force is provided by the pressing air cylinder. The air outlet hole and the through hole are used for detecting the sealing performance of the rivet nut on the lower shell of the power battery. The scheme has higher flexibility, has compatibility with different types of battery shells, can perform sealing detection on independent rivet pulling holes, and has outstanding pertinence characteristics. The universal structural design enables the airtightness detection equipment to flexibly modify and adjust a target, is convenient to install, reduces the occupied space, and meets more harsh environmental requirements.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies for automobiles, and more specifically, to a power battery lower shell sealing detection device and a detection apparatus. Background Art

[0002] Power batteries are the power source of new energy vehicles. As the core component of new energy electric vehicles, the energy density, safety, and reliability of battery packs directly affect the range, safety, and service life of electric vehicles. As one of the key indicators to measure its quality, air tightness directly affects the service life, performance, and safety of the battery. Therefore, power battery air tightness testing plays an important role in the battery production and testing process, especially before the power battery leaves the factory and after disassembly and assembly, the overall air tightness needs to be tested to increase the safety of the power battery throughout its life cycle and reduce the risk of failure.

[0003] The sealing performance of power batteries is mainly achieved through two aspects: first, the structural sealing of the battery pack body, which is usually achieved by laser welding technology to connect the upper and lower parts of the body into a whole; second, auxiliary sealing rings or waterproof sealants. These additional measures can further enhance the sealing performance of the battery pack. Before the power battery pack leaves the factory, the upper and lower shells are first tested for sealing performance. After passing the test, they are assembled into groups and the assembled power battery packs are tested for sealing performance for the second time to ensure their good sealing performance.

[0004] There are a series of strict requirements for the air tightness testing of new energy vehicle batteries and power battery packs. For the testing of the sealing performance of power battery packs, the industry mostly uses the method of inflation and pressure maintenance for measurement, that is, filling a fixed amount or constant pressure of gas into the power battery pack, and testing the changes in the air pressure in the power battery pack to evaluate the sealing performance of the power battery pack. Due to the large internal space of the current power battery, the large amount of gas filled and the long filling time, the time-consuming testing of the sealing performance of the power battery has become a key factor affecting production. With the continuous improvement of testing technology, the air tightness testing of batteries has become more accurate and efficient. How to reduce the cost of sealing performance testing, speed up production rhythm, and support the sustainable development of the battery industry has become the key focus of the industry. Summary of the invention

[0005] One object of the present invention is to provide a new technical solution for a power battery lower shell sealing detection device and a detection apparatus to solve the technical problems raised in the above-mentioned background technology.

[0006] According to a first aspect of the present invention, there is provided a power battery lower housing sealing detection device, comprising a pressing platform, a pressing plate and a pressing cylinder;

[0007] The piston rod of the pressing cylinder extends upward, one end of the pressing plate is connected to the piston rod, and the other end is provided with a through hole;

[0008] The press platform is arranged on the lower side of the press plate, and an inflation device is connected to the side wall of the press platform through an interface. An air outlet is provided on the top of the press platform, and the air outlet corresponds to the through hole. The lower shell of the power battery is arranged between the press plate and the press platform, and the clamping force is provided by the clamping cylinder. The air outlet and the through hole are used to detect the sealing of the rivet nut on the lower shell of the power battery.

[0009] Optionally, according to the power battery lower shell sealing detection equipment described in the present invention, a pressing block is provided on the lower end surface of the pressing plate, a cavity communicating with the through hole is provided in the pressing block, and the air outlet of the pressing platform is completely wrapped in the cavity.

[0010] Optionally, according to the power battery lower shell sealing detection device of the present invention, a rubber pad is provided on the end surface of the pressing block, and the rubber pad is in contact with the power battery lower shell.

[0011] Optionally, according to the power battery lower shell sealing detection device of the present invention, a rubber ring is provided on the pressing platform around the air outlet.

[0012] Optionally, according to the power battery lower shell sealing detection device of the present invention, the rubber ring protrudes beyond the end surface of the pressing platform.

[0013] Optionally, according to the power battery lower shell sealing detection device of the present invention, the top of the piston rod is rotatably connected to a support rod, and the pressure plate is fixed to the end of the support rod by at least two screws.

[0014] Optionally, according to the power battery lower shell sealing detection equipment described in the present invention, the clamping cylinder is also provided with a fixed seat located next to the piston rod, and a connecting rod is connected to the fixed seat through a pin shaft, and the other end of the connecting rod is connected to the support rod through a pin shaft, and the connection point between the support rod and the connecting rod is the rotation center of the pressure plate.

[0015] Optionally, according to the power battery lower shell sealing detection device of the present invention, the connection point between the connecting rod and the pressure plate is located in the middle of the pressure plate close to one end of the piston rod.

[0016] Optionally, according to the power battery lower shell sealing detection device of the present invention, the end surface of the support rod close to the pressure plate is the positioning reference surface of the power battery lower shell.

[0017] According to another aspect of the present invention, there is also a power battery lower shell sealing detection device, comprising a stand and a plurality of detection devices described in the above embodiments;

[0018] A work surface is provided on the upper side of the stand, and the work surface is used to place the lower shell of the power battery; the detection equipment is evenly arranged on the circumference of the work surface, and performs sealing detection on the rivet nuts on the lower shell of the power battery.

[0019] Compared with the existing solutions, the present invention has the following technical features:

[0020] 1) This solution has higher flexibility, is compatible with different types of battery shells, and can perform sealing tests on individual rivet holes, with outstanding targeted features. The universal structural design allows the airtightness detection equipment to flexibly modify and adjust the target, is easy to install, occupies less space, and meets more stringent environmental requirements.

[0021] 2) Compared with other solutions, this airtightness detection equipment is easy to assemble and disassemble, simple to operate, and has the characteristics of rapid detection and strong target targeting. It has a significant effect on improving production efficiency and reducing labor costs in the actual production process.

[0022] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0024] Figure 1 It is a structural schematic diagram of the power battery lower shell airtightness detection device disclosed in the present invention;

[0025] Figure 2 It is a schematic diagram of the use of the power battery lower shell airtightness detection device disclosed in the present invention;

[0026] Figure 3 It is a schematic structural diagram of the power battery lower shell airtightness detection device disclosed in the present invention.

[0027] Description of reference numerals:

[0028] 1-clamping cylinder; 2-piston rod; 3-fixed seat; 4-connecting rod; 5-support rod; 6-pressing plate; 7-screw; 8-perforation; 9-pressing block; 10-pressing platform; 11-interface; 12-air outlet; 13-rubber ring; 14-lower housing of power battery; 15-testing equipment; 16-test bench. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] according to Figure 1 and Figure 2 As shown, the present invention provides a sealing detection device for a power battery lower shell 14, comprising a pressing platform 10, a pressing plate 6 and a pressing cylinder 1.

[0034] The piston rod 2 of the pressing cylinder 1 extends upward, one end of the pressing plate 6 is connected to the piston rod 2, and the other end is provided with a through hole 8.

[0035] The press platform 10 is arranged on the lower side of the press plate 6, and an inflation device is connected to the side wall of the press platform 10 through an interface 11. An air outlet 12 is provided on the top of the press platform 10, and the air outlet 12 corresponds to the through-hole 8. The power battery lower shell 14 is arranged between the press plate 6 and the press platform 10, and the clamping force is provided by the clamping cylinder 1. The air outlet 12 and the through-hole 8 are used to detect the sealing of the rivet nut on the power battery lower shell 14.

[0036] The pressure platform 10 is connected to the interface 11 through an external inflation device, and the detection gas is stably and evenly filled into the pressure platform 10. After the air pressure reaches the specified numerical range, the pressure is maintained and the air pressure value is monitored. If the pressure drop is less than the specified standard, it is considered that the sealing performance of the rivet nut hole is good.

[0037] The present invention aims to provide a design of airtightness detection equipment for the lower shell 14 of a power battery, which adopts an independent clamping tool and a charging interface 11. Compared with the traditional airtightness detection scheme of a power battery, this design performs a separate airtightness performance test on each rivet nut, which increases the airtightness detection accuracy and has more design space for improving the airtightness detection efficiency. The independent hole position airtightness detection device is integrated with the clamping device, which has a higher degree of freedom for hole position airtightness detection.

[0038] Furthermore, a pressing block 9 is provided on the lower end surface of the pressing plate 6, and a cavity communicating with the through hole 8 is provided in the pressing block 9, and the air outlet 12 of the pressing platform 10 is completely wrapped in the cavity. A rubber pad is provided on the end surface of the pressing block 9, and the rubber pad contacts the lower housing 14 of the power battery.

[0039] In this embodiment, the cavity in the pressure block 9 completely wraps the rivet nut of the power battery lower shell 14. The rubber pad has an annular structure and is arranged around the rivet nut to ensure the sealing of the detection and prevent air leakage between the pressure block 9 and the power battery lower shell 14. In addition, the rubber pad can also reduce damage to the power battery lower shell 14.

[0040] Furthermore, a rubber ring 13 is provided on the pressing platform 10 around the air outlet 12. The rubber ring 13 protrudes from the end surface of the pressing platform 10. As described above, the sealing of the test is ensured to prevent air leakage between the pressing block 9 and the lower shell 14 of the power battery. In addition, the rubber pad can also reduce damage to the lower shell 14 of the power battery.

[0041] Furthermore, the top of the piston rod 2 is rotatably connected to a support rod 5, and a pressing plate 6 is fixed to the end of the support rod 5 by at least two screws 7. In implementation, the connection length between the pressing plate 6 and the piston rod 2 is shortened by the support rod 5 to avoid the problem that the pressing plate 6 is easily broken or the pressing force is insufficient due to being too long.

[0042] Furthermore, the clamping cylinder 1 is provided with a fixing seat 3 beside the piston rod 2, and a connecting rod 4 is connected to the fixing seat 3 through a pin shaft, and the other end of the connecting rod 4 is connected to the support rod 5 through a pin shaft, and the connection point between the support rod 5 and the connecting rod 4 is the rotation center of the pressing plate 6. The connection point between the connecting rod 4 and the pressing plate 6 is located in the middle of the pressing plate 6 near one end of the piston rod 2. In this embodiment, the connecting rod 4 and the support rod 5 form a lever structure, and the clamping cylinder 1 serves as the force-applying end of the lever structure, which can not only ensure the clamping effect of the pressing plate 6 on the lower housing 14 of the power battery, but also effectively avoid the problem that the support rod 5 and the pressing plate 6 are far away from the force-applying end, which is easy to cause breakage.

[0043] Furthermore, the end surface of the support rod 5 close to the pressure plate 6 is the positioning reference surface of the power battery lower housing 14. Figure 2 As shown, the pressing plate 6 and the pressing platform 10 act on the upper and lower end surfaces of the power battery lower shell 14, and the end surface of the support rod 5 abuts against the side wall of the power battery lower shell 14 to ensure that the power battery lower shell 14 is clamped in place.

[0044] according to Figure 3 As shown, the present invention also provides a power battery lower shell sealing detection device, including a stand 16 and a plurality of detection devices 15 in the above embodiments;

[0045] A work surface is provided on the upper side of the stand 16, and the work surface is used to place the power battery lower shell 14; the detection equipment 15 is evenly arranged around the work surface, and performs a sealing test on the rivet nuts on the power battery lower shell 14. Taking the sealing test of the rivet nuts on the side beams on both sides as an example, the shell is an external sealing solution, and the sealing performance of the rivet nuts and their mounting holes is an important sealing indicator. Each rivet hole is tightened by a set of airtight detection equipment 15 and the sealing performance is tested separately.

[0046] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A power battery lower shell sealing detection device, characterized in that: It includes a pressing table, a pressing plate and a pressing cylinder; The piston rod of the pressing cylinder extends upward, one end of the pressing plate is connected to the piston rod, and the other end is provided with a through hole; The press platform is arranged on the lower side of the press plate, and an inflation device is connected to the side wall of the press platform through an interface. An air outlet is provided on the top of the press platform, and the air outlet corresponds to the through hole. The lower shell of the power battery is arranged between the press plate and the press platform, and the clamping force is provided by the clamping cylinder. The air outlet and the through hole are used to detect the sealing of the rivet nut on the lower shell of the power battery.

2. The power battery lower shell sealing detection device according to claim 1, characterized in that: A pressing block is provided on the lower end surface of the pressing plate, a cavity communicating with the through hole is provided in the pressing block, and the air outlet of the pressing platform is completely wrapped in the cavity.

3. The power battery lower shell sealing detection device according to claim 2, characterized in that: A rubber pad is provided on the end surface of the pressing block, and the rubber pad is in contact with the lower housing of the power battery.

4. The power battery lower shell sealing detection device according to claim 3, characterized in that: A rubber ring is provided on the pressing platform at the peripheral side of the air outlet.

5. The power battery lower shell sealing detection device according to claim 4, characterized in that: The rubber ring protrudes out of the end surface of the pressing platform.

6. The power battery lower shell sealing detection device according to claim 1, characterized in that: The top of the piston rod is rotatably connected to a support rod, and the pressure plate is fixed to the end of the support rod by at least two screws.

7. The power battery lower shell sealing detection device according to claim 6, characterized in that: The clamping cylinder is also provided with a fixed seat beside the piston rod, and a connecting rod is connected to the fixed seat through a pin shaft. The other end of the connecting rod is connected to the support rod through a pin shaft, and the connection point between the support rod and the connecting rod is the rotation center of the pressure plate.

8. The power battery lower shell sealing detection device according to claim 7, characterized in that: The connection point between the connecting rod and the pressing plate is located in the middle of the pressing plate close to one end of the piston rod.

9. The power battery lower shell sealing detection device according to claim 6, characterized in that: The end surface of the support rod close to the pressure plate is the positioning reference surface of the lower shell of the power battery.

10. A power battery lower shell sealing detection device, characterized in that: A test device comprising a stand and a plurality of test devices as described in any one of claims 1 to 9; A work surface is provided on the upper side of the stand, and the work surface is used to place the lower shell of the power battery; the detection equipment is evenly arranged on the circumference of the work surface, and performs sealing detection on the rivet nuts on the lower shell of the power battery.

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