Device suitable for air tightness detection of new energy battery shell

Abstract

The utility model relates to a device suitable for air tightness detection of a new energy battery shell. The device comprises a rack. The base is arranged in the rack and is used for bearing the battery shell; the plugging part is arranged on the rack and / or the base and is used for plugging a hole channel and / or a gap for communicating the to-be-detected cavity with the outside; the air supply mechanism is arranged on the rack or the base and is used for supplying air to the to-be-tested cavity; the pressing part is arranged on the rack and is used for pressing the battery shell and the base; the orthopedic parts are divided into the upper orthopedic parts and the lower orthopedic parts which are arranged in a one-to-one opposite mode, and the upper orthopedic parts are arranged on the pressing parts; the lower shape correcting part is arranged on the base and can tightly press the water cooling plate from the upper face or the lower face of the water cooling plate in a matched mode so as to correct deformation. The air tightness detection device has the advantages that the flatness of the water-cooling plate can be ensured when the air tightness is detected by arranging the shape correcting part which can be freely configured, the working procedures are reduced, and the quality of a battery pack is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical workpiece detection field, concretely relates to a device suitable for new energy battery shell airtightness detection. BACKGROUND

[0002] Battery shell as the bearing of new energy battery pack, plays a key role to the safe work and protection of battery module, the existing battery shell structure such as the battery box structure disclosed in the Chinese utility model patent (announcement) No. CN216413153U, the box structure includes frame and the liquid cooling plate welded with frame. The welding mode of the procedure mainly has friction stir welding, and the welding forming process has particularity, defects can be generated in the weld position, so that the airtightness requirement of battery pack cannot be met. For this reason, the Chinese utility model patent with application No. ZL202323133987.8 discloses a kind of airtightness detection device of battery shell, including pressing assembly, plugging assembly, positioning assembly and the detection table for installing each component;The airtightness of shell is detected by the way of pressing battery shell and inflating on the detection table.

[0003] But due to the process that frame and water cooling plate are welded into shape, water cooling plate can be deformed to a certain extent, and needs to be corrected in flatness, but the airtightness detection device in the above prior art can only detect the airtightness of battery shell and cannot correct the flatness, if the flatness correction is needed, another flatness correction device is needed to correct the flatness, not only the steps are complicated, but also the weld between water cooling plate and frame after flatness correction can produce new defects, resulting in the loss of airtightness of battery shell. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem in the prior art, and provides a device suitable for new energy battery shell airtightness detection, which can correct the flatness of frame body.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is as follows: the device suitable for new energy battery shell airtightness detection comprises:

[0006] A rack;

[0007] A base is arranged in the rack and is used to carry the battery shell, wherein the battery shell comprises a frame body and a water cooling plate welded on the frame body, and the frame body and the water cooling plate surround a to-be-measured cavity with an opening downward;

[0008] A plugging part is arranged on the rack and / or the base and is used to block the hole and / or gap, which communicates with the to-be-measured cavity and the outside;And

[0009] The gas supply mechanism is arranged on the frame or the base and is used for supplying gas to the cavity to be tested.

[0010] The pressing part is arranged on the frame and is used for pressing the battery shell and the base, so that a sealed space is formed between the cavity to be tested and the base.

[0011] The orthopedic part includes an upper orthopedic part and a lower orthopedic part arranged opposite to the upper orthopedic part. The upper orthopedic part is arranged on the pressing part and can act on the water-cooled plate from the upper surface of the water-cooled plate. The lower orthopedic part is arranged on the base and can act on the water-cooled plate from the lower surface of the water-cooled plate. The orthopedic part cooperatively presses the water-cooled plate from the upper / lower surface of the water-cooled plate to correct the deformation.

[0012] As a specific arrangement of the orthopedic part, preferably, the upper orthopedic part is at least two first protrusions protruding from the lower surface of the pressing part. The lower surface of each first protrusion is flush with the upper surface of the water-cooled plate. Correspondingly, the lower orthopedic part is at least two second protrusions arranged on the base. The upper surface of each second protrusion is flush with the lower surface of the water-cooled plate and is arranged opposite to the corresponding first protrusion. The first protrusion and the second protrusion can also be designed to be detachably connected. The operator can flexibly change the arrangement of the first protrusion and the second protrusion according to the deformation state of the water-cooled plate, so as to correct the deformation of the water-cooled plate at any position.

[0013] Further, the distribution of each first protrusion on the pressing part is arrayed. Correspondingly, the distribution of each second protrusion on the base is also arrayed. The arrayed arrangement can better correct the deformation of the water-cooled plate.

[0014] As a specific arrangement of the second protrusion, preferably, the base has a filling block capable of being filled in the cavity to be tested and leaving a gap between the cavity to be tested. The filling block is provided with at least two accommodation grooves. Each accommodation groove is used for accommodating the corresponding second protrusion. Each second protrusion protrudes from the upper surface of the filling block. When the cavity to be tested is subjected to the air tightness test, the gas supply mechanism only needs to supply gas to the gap between the filling block and the cavity to be tested. Since the gap is small, the inflation speed is fast and uniform, which improves the air tightness test efficiency and accuracy. The accommodation grooves distributed on the filling block provide space for the installation of the second protrusion.

[0015] As a specific implementation of the pressing part, preferably, the pressing part is arranged on the rack and above the loading position of the base battery shell; the pressing part comprises an oil cylinder and a pressing plate connected to the piston rod of the oil cylinder, the piston rod of the oil cylinder can move up and down relative to the rack, and in the state of downward movement of the piston rod, the pressing plate can be driven to press down together with the upper straightening part to the water-cooled plate. In this way, while the oil cylinder drives the pressing plate to press the water-cooled plate downward to cooperate with the blocking part to block the battery shell for air tightness detection, the upper straightening part can also press downward to cooperate with the lower straightening part arranged on the base to press the water-cooled plate and correct the deformation of the water-cooled plate. In addition to the oil cylinder, other driving cylinders such as air cylinders or electric driving cylinders can also be used to drive the pressing plate to move up and down.

[0016] Further, a guide assembly is arranged on the rack, the guide assembly comprises a guide plate arranged on the oil cylinder and a guide column connected to the guide plate and the rack along the up-down direction, and a guide sleeve is arranged on the guide plate and used to be sleeved on the guide column. In this way, the pressing plate can be kept horizontal when it is pressed down, so that the upper straightening part can act on the water-cooled plate horizontally after the pressing plate is pressed down, and the flatness of the water-cooled plate is ensured.

[0017] As a specific implementation of the blocking part, preferably, the blocking part comprises:

[0018] a blocking block, the frame of the battery shell has an opening hole communicating with the outside, and the blocking block is arranged on the base and used to block the opening hole;

[0019] a sealing ring, used to seal the periphery of the downward opening of the cavity to be detected, and a groove for accommodating the sealing ring is arranged on the base along the periphery of the frame. The cavity to be detected is sealed under the joint sealing of the blocking block and the sealing ring, so that the air tightness is detected.

[0020] Compared with the prior art, the device for air tightness detection can correct the deformation of the water-cooled plate by arranging the upper straightening part on the pressing part and the lower straightening part on the base, and can ensure the flatness of the water-cooled plate while detecting the air tightness, thereby reducing the process and improving the quality of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of one angle when the embodiment of the utility model is loaded;

[0022] Figure 2 It is a structural schematic view of another angle when the embodiment of the utility model is loaded;

[0023] Figure 3 It is a sectional view of one angle when the embodiment of the utility model is loaded;

[0024] Figure 4 It is the structural schematic view of the pressing part of the embodiment of the utility model;

[0025] Figure 5 It is the sectional view of the embodiment of the utility model after removing the water cooling plate of one angle;

[0026] Figure 6 It is the structural schematic view of the battery shell in the embodiment of the utility model;

[0027] Figure 7 It is the exploded structural schematic view of the base and the sealing ring in the embodiment of the utility model. Specific implementation

[0028] The utility model will be further described in detail in combination with the drawings.

[0029] As Figures 1-3 The best embodiment of the utility model is shown. The device suitable for the air tightness detection of new energy battery shell of the embodiment includes the rack 1, the base 2 for bearing the battery shell 3 is arranged in the rack 1, the pressing part for pressing the battery shell 1 and the base 2 is arranged on the base 2, the plugging part for plugging the hole and / or the gap for communicating with the outside of the cavity to be detected, and the gas supply mechanism for supplying the cavity to be detected with gas. Wherein, the battery shell 3 detected in the embodiment adopts the battery shell 3 shown in Figure 6 The battery shell 3 includes the frame body 32 and the water cooling plate 31 welded on the frame body 32, and the frame body 32 and the water cooling plate 31 surround the cavity to be detected with the opening downward.

[0030] As the special improvement of the embodiment for the flatness correction of the water cooling plate 31 when the air tightness of the battery shell 3 is detected, the pressing part for pressing the battery shell 3 and the base 2 and the orthopedic part are arranged on the rack 1. Wherein, the orthopedic part includes the upper orthopedic part and the lower orthopedic part arranged on the upper and lower sides of the water cooling plate 3, specifically, referring to Figure 2 、 Figure 4 And referring to Figure 5The upper straightening part includes a plurality of first protrusions 71 which are detachably arranged on the pressing part and can act on the water-cooled plate 31 from the upper surface of the water-cooled plate 31, and the lower straightening part includes a plurality of second protrusions 72 which are detachably arranged on the base 2 and can act on the water-cooled plate 31 from the lower surface of the water-cooled plate 31. The first protrusions 71 protrude from the lower surface of the pressing part and the lower surface thereof is flush with the upper surface of the water-cooled plate 31, and the upper surface of the second protrusions 72 is flush with the lower surface of the water-cooled plate 31 and is arranged opposite to the first protrusions 71 corresponding thereto. The first protrusions 71 are arranged in an array on the pressing part, and the second protrusions 72 are also arranged in an array on the base 2. During loading, the first protrusions 71 and the second protrusions 72 are respectively located on both sides of the water-cooled plate 31, and the water-cooled plate 31 contacted by the first protrusions 71 and the second protrusions 72 can be pressed to correct the deformation.

[0031] Since the plurality of first protrusions 71 and the plurality of second protrusions 72 are arranged, the operator needs to flexibly change the arrangement mode of the straightening part according to the deformation state of the water-cooled plate 31 to correct the deformation of the water-cooled plate 31 at any position. Therefore, a plurality of screw holes are arranged on the pressing surface of the pressing plate 4, the first protrusions 71 are fixed to the pressing plate 4 by screws, and the first protrusions 71 are detachably connected to the pressing plate 4. The base 2 is provided with filling blocks 22 which can be filled in the to-be-tested cavity and leave a gap between the to-be-tested cavity and the filling blocks 22. The filling blocks 22 are made of solid materials such as nylon, and the filling blocks 22 are provided with at least two accommodation grooves 221, each of which is used to accommodate the second protrusion 72 corresponding thereto, and each of the second protrusions 72 protrudes from the filling block 22. When the to-be-tested cavity is subjected to the air tightness test, the air supply mechanism only needs to supply air to the gap between the filling block 22 and the to-be-tested cavity. Since the gap is small, the air charging speed is fast and the air charging is uniform, and the air tightness test efficiency and accuracy are improved.

[0032] In addition, a gasket 73 is arranged between the first protrusion 71 and the pressing plate 4 and between the second protrusion 72 and the accommodation groove 221 to improve the stability.

[0033] Reference Figures 1-4 The specific structure of the pressing part is that a cross beam 11 is arranged above the loading position of the battery shell 3 on the rack 1, and four oil cylinders 111 are arranged on the cross beam 11 along the length direction of the rack. The piston rod 112 of each oil cylinder 111 is connected with the pressing plate 4, the piston rod 112 of the oil cylinder 111 can move up and down relative to the rack 1, and in the state that the piston rod 112 moves downward, the pressing plate 4 and the upper straightening part can be driven to press downward on the water-cooled plate 31, so that a sealed space is formed between the to-be-tested cavity and the base 2.

[0034] Reference Figure 4In order to keep the pressing plate 4 horizontal when it is pressed down, thereby ensuring the flatness of the water-cooled plate 31, a guide assembly is further arranged on the rack 1, which includes a guide plate 113 arranged on the oil cylinder 111 near the two ends of the cross beam 11 and a guide column 41 connected to the guide plate 113 and the rack 1 along the up-down direction, and a guide sleeve 114 arranged on the guide plate 113 for sleeving the guide column. Through the sliding fit between the guide column 41 and the guide sleeve 114, it is ensured that the pressing plate 4 can always keep horizontal when it is lifted up and pressed down. It should be noted that even if only one oil cylinder 111 is arranged, the pressing plate 4 can still be kept parallel to the base through the cooperation of the guide plate 113 and the guide column 41.

[0035] As shown in Figures 1-3 and Figure 7 , the blocking part includes a blocking block 51 and a sealing ring 52; the frame 32 of the battery shell 3 has an opening 321 communicating with the outside, the blocking block 51 is sealingly clamped on the opening 321 of the frame 32 and can block the opening 321; the base 2 has a groove 21 for accommodating the sealing ring 52 along the circumference of the frame 32, and the sealing ring 52 is arranged in the groove 21 and can seal the downwardly open circumference of the cavity to be measured. When the base 2 and the frame 32 are pressed tightly, the sealing ring 52 can prevent air leakage gap between the frame 32 and the base 2.

[0036] As shown in Figure 3 , a gas supply mechanism is arranged on the base 2, which can fill gas into the battery shell 3. Specifically, the gas supply mechanism is arranged on the first blocking block 51' and is a pipeline connecting the distal end of the first blocking block 51' extending into the battery shell 3 and the proximal end outside the battery shell 3.

[0037] As shown in Figures 1-3 , the base 2 is provided with a limiting block 8 and a guide block 9 around the loading position of the battery shell 3 to determine the position of the battery shell 3.

[0038] In use, before loading, the operator first measures the flatness of the water-cooled plate 32 using the three-coordinate method or other methods, finds out the parts of the water-cooled plate 32 that need to be corrected, then adjusts the number and position of the first and second protrusions 71 and 72 accordingly, and then loads. After loading is completed, the operator presses down the pressing plate 4 by operating the oil cylinder 111, corrects the water-cooled plate 3 and presses the entire battery shell 3 tightly on the base 2. Then, the gas supply mechanism is inflated, and the operator detects the air tightness of the corrected battery shell 3.

Claims

1. A device suitable for detecting the air tightness of a new energy battery shell, comprising: a rack (1); a base (2) arranged in the housing (1) for carrying a battery housing (3), wherein a battery shell (3) comprising a frame (32) and a water-cooled plate (31) welded on the frame (32), the frame (32) and the water-cooled plate (31) enclosing a downwardly open cavity to be measured; a plugging part provided on the rack (1) and / or the base (2) for plugging the cavity to be measured and the hole and / or gap communicating with the outside; and a gas supply mechanism provided on the rack (1) or the base (2) for supplying gas to the cavity to be measured; characterized in that it further comprises: a pressing part provided on the rack (1) for pressing the battery shell (3) and the base (2) to form a sealed space between the cavity to be measured and the base (2); a straightening part comprising an upper straightening part and a lower straightening part provided in one-to-one correspondence with the upper straightening part, the upper straightening part being arranged on the pressing part and being capable of acting on the water-cooled plate (31) from the upper surface of the water-cooled plate (31); the lower straightening part being arranged on the base (2) and being capable of acting on the water-cooled plate (31) from the lower surface of the water-cooled plate (31), the straightening part cooperatively pressing the water-cooled plate (31) from the upper / lower surface of the water-cooled plate (31) to correct the deformation.

2. The apparatus of claim 1, wherein: The upper straightening part is at least two first protrusions (71) protruding below the lower surface of the pressing part, the lower surface of each first protrusion (71) being flush with the upper surface of the water-cooled plate (31); correspondingly, the lower straightening part is at least two second protrusions (72) provided on the base (2), the upper surface of each second protrusion (72) being flush with the lower surface of the water-cooled plate (31) and being arranged in one-to-one correspondence with the corresponding first protrusion (71).

3. The apparatus of claim 2, wherein: The distribution of each first protrusion (71) on the pressing part is arrayed; correspondingly, the distribution of each second protrusion (72) on the base (2) is also arrayed.

4. The apparatus of claim 3, wherein: The base (2) has a filling block (22) capable of being filled in the cavity to be measured and leaving a gap between the cavity to be measured, the filling block (22) being provided with at least two accommodation grooves (221) for accommodating the corresponding second protrusion (72), each second protrusion (72) protruding from the filling block (22).

5. The apparatus of any of claims 1-4, wherein: The pressing part is provided on the rack (1) and located above the battery shell (3) loading position of the base (2); the pressing part comprises an oil cylinder (111) and a pressing plate (4) connected to the end of the piston rod (112) of the oil cylinder (111), the piston rod (112) of the oil cylinder (111) being capable of moving up and down relative to the rack (1), and in the state of downward movement of the piston rod (112), the pressing plate (4) and the upper straightening part are capable of being pressed downward on the water-cooled plate (31).

6. The apparatus of claim 5, wherein: The rack (1) is provided with a guide assembly, which comprises a guide plate (113) arranged on the oil cylinder (111) and a guide column (41) connected to the guide plate (113) and the rack (1) along the up-down direction respectively, and a guide sleeve (114) arranged on the guide plate (113) for sleeving on the guide column.

7. The device for detecting the air tightness of a new energy battery shell according to any one of claims 1-4, characterized in that: The sealing part comprises: A sealing block (51) is arranged on the base (2) and used for sealing the opening (321) and has an opening (321) in communication with the outside on the frame (32) of the battery shell (3); A sealing ring (52) is used for sealing the downward opening periphery of the cavity to be measured, and a groove (21) for accommodating the sealing ring (52) is arranged along the periphery of the frame (32) on the base (2).

Images