CN211401556U

CN211401556U - Airtight detection device of shutoff battery package relief valve

Info

Publication number: CN211401556U
Application number: CN202020339777.1U
Authority: CN
Inventors: 王�锋; 赵俊杰; 陈文骏; 姜志文; 周亚萍
Original assignee: SAIC CATL Power Battery System Co Ltd
Current assignee: SAIC CATL Power Battery System Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-09-01
Anticipated expiration: 2030-03-18

Abstract

The utility model discloses an airtight detection device of shutoff battery package relief valve, include: the shell is in a tubular shape with two open ends, and a first end of the shell extends inwards to form an inner edge; a piston member movable within the housing; a latch member having a shaft by which the latch member is mounted at the second end of the housing, the latch member being configured to: when the locking piece rotates around the rotating shaft, the locking piece jacks the piston piece towards the first end of the shell; an elastic member installed between the inner edge and a front end surface of the piston member, the elastic member being configured to: when the locking member is pushed toward the first end portion, the elastic member is compressed and expanded. The utility model has the advantages that: (1) the air tightness detection device can detect the tightness of the connection of the lower tray; (2) the air tightness detection device can be positioned and plugged by itself without depending on other parts; (3) the material and processing cost of the air tightness detection device is greatly reduced.

Description

Airtight detection device of shutoff battery package relief valve

Technical Field

The utility model relates to a sealing device especially relates to an airtight detection device of shutoff battery package relief valve for airtight test of power battery package for new forms of energy automobile belongs to power battery technical field.

Background

After the battery pack is assembled, the battery pack needs to be subjected to airtight testing, and the battery pack can be taken out of a warehouse only after the battery pack reaches the dustproof and waterproof level of IP 67. And in the stage of developing and designing the battery pack, simulation is carried out. At the battery package service phase, its inside under powerful pressure, the battery package can warp, influences the security, so install the relief valve in PRA assembly department, if the battery package is inside to exceed certain pressure, the relief valve can open the pressure release automatically. During the airtight test, adopt the flow method, need fill certain pressure gas in the battery package, lead to the relief valve to open, need take measures to the shutoff of relief valve, ensure the true accuracy of test data.

The existing air tightness detection device cannot detect whether the explosion-proof valve is connected with the lower tray or not. The existing airtight detection device has to depend on other parts, such as a lower tray positioning hole to block an explosion-proof valve, ultra-accurate positioning is needed, the sizes of the parts are accurate, otherwise, the sealing condition cannot be met, and the processing and manufacturing costs are too high and heavy.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the existing battery pack pressure release valve air tightness detection device has high requirement on size precision and high processing cost; the body is heavy and the use is inconvenient.

In order to solve the technical problem, the utility model provides an airtight detection device of shutoff battery package relief valve, include:

the shell is in a tubular shape with two open ends, and a first end of the shell extends inwards to form an inner edge;

a piston member movable within the housing;

a lock member having a shaft by which the lock member is mounted at the second end of the housing, the lock member being configured to: when the locking piece rotates around the rotating shaft, the locking piece jacks the piston piece towards the first end of the shell;

an elastic member mounted between the inner edge and the front end surface of the piston member, the elastic member being configured to: when the piston member is urged toward the first end of the housing, the resilient member is compressed and expanded.

In some embodiments, the inner wall of the housing is provided with at least two grooves, and the outer wall of the piston member is provided with a rib which is matched with the grooves.

In some embodiments, the first end of the housing is provided with a positioning hole.

In some embodiments, the second end of the housing is mounted with an extension, and the extension is provided with a rotating shaft hole for mounting the rotating shaft.

In some embodiments, the latch member is provided with a handle.

In some embodiments, the portion of the locking member that contacts the rear end surface of the piston member is a combination of a curved surface and a flat surface.

In some embodiments, the distance between the curved surface and the central axis of the shaft varies smoothly.

In some embodiments, the plane is configured to: when the locking piece is locked in place, the plane is in integral contact with the rear end face of the piston piece.

In some embodiments, the resilient member is made of rubber.

In some embodiments, other components of the air-tightness detecting device, besides the elastic member, are machined from an aluminum alloy.

The utility model has the advantages that:

(1) the air tightness detection device can detect the tightness of the connection of the lower tray;

(2) the air tightness detection device can be positioned and plugged by itself without depending on other parts;

(3) the material and processing cost of the air tightness detection device is greatly reduced.

Drawings

Fig. 1 is a schematic diagram of an overall structure of an oblique rear view angle of an air tightness detecting device according to a preferred embodiment of the present invention;

fig. 2 is a schematic view of an oblique front view of the air tightness detecting device according to a preferred embodiment of the present invention;

fig. 3 is a schematic structural diagram of the elastic member, the piston member and the locking member in the air tightness detecting device according to a preferred embodiment of the present invention;

fig. 4 is a schematic diagram illustrating an oblique front view of the elastic member, the piston member and the locking member of the air tightness detecting device according to a preferred embodiment of the present invention;

fig. 5 is a schematic view of an appearance structure of a battery pack relief valve corresponding to the air tightness detecting device of the present invention;

fig. 6 is a schematic view illustrating the air tightness detecting device according to a preferred embodiment of the present invention plugging the pressure release valve of the battery pack;

fig. 7 is an appearance structure diagram of the lower case of the battery pack corresponding to the air tightness detecting device of the present invention.

The reference numerals of the above figures are as follows:

100 case

110 inner edge

120 positioning notch

130 extension part

200 piston element

210 bead

220 groove

300 locking piece

310 rotating shaft

320 lock body

Curved surface of 321

322 plane

330 handle

400 elastic member

410 groove

500 relief valve

510 air outlet

520 position fixing part

530 screw

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Unless otherwise defined, technical or scientific terms used in the claims and the specification of this patent shall have the ordinary meaning as understood by those of ordinary skill in the art to which this patent belongs. As used in this specification and the appended claims, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "a" or "an," and the like, do not denote a limitation of quantity, but rather denote the presence of at least one. In the description of this patent, unless otherwise indicated, "a plurality" means two or more. The word "comprising" or "having", and the like, means that the element or item appearing before "comprises" or "having" covers the element or item listed after "comprising" or "having" and its equivalent, but does not exclude other elements or items.

In the description of this patent, it is to be understood that the terms "upper," "lower," "left," "right," "horizontal," "lateral," "longitudinal," "top," "bottom," "inner," "outer," "clockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings to facilitate the description of the patent and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

In order to ensure the use safety of the battery pack, a pressure release valve is arranged on the battery pack. When the battery pack is used, after the inside of the battery pack exceeds a certain pressure, the pressure release valve can be opened automatically to release the pressure, and the safety of the battery pack is ensured. When manufacturers test the air tightness of the battery pack, the flow method is generally adopted for testing, the battery pack needs to be filled with gas, and if the air pressure of the gas exceeds the upper bearing limit of the pressure release valve, the pressure release valve can be opened to release the gas, so that the test fails. Therefore, in the air tightness test, although the pressure relief valve is allowed to open due to the increase of the air pressure, the pressure relief valve needs to be ensured not to leak air to the outside, otherwise, the authenticity and the accuracy of the air tightness test of the battery pack are affected. At present, the new energy automobile battery package should satisfy the sealed requirement of IP67, detects through airtight test equipment whether upper cover and the lower casing of battery package have the leak source.

The utility model discloses an airtight detection device of battery package relief valve, it is exactly to say that this is a relief valve plugging device who uses when new forms of energy battery package airtight test. When airtight test, the pressure release valve will open under certain pressure, because plugging device has blockked the contact of relief valve with the external world, also can't be toward outer leakage gas after the relief valve is opened, guarantee airtight test reliability and accuracy. The device can ensure that the pressure release valve does not influence the test due to the increase of the air pressure in the battery pack. The device has low development cost and improves the production efficiency of the battery pack.

Fig. 1 and fig. 2 are schematic diagrams showing the overall structure of the air tightness detecting device according to a preferred embodiment of the present invention, wherein fig. 1 is observed at an oblique front viewing angle, and fig. 2 is observed at an oblique rear viewing angle. The overall appearance of the air tightness detecting device can be understood by combining fig. 1 and fig. 2. The air tightness detecting device is mainly composed of a housing 100, a piston member 200, a locking member 300, and an elastic member 400. The elastic member 400 has elasticity, and is made of an elastic material, and generally, a rubber member is used. In order to ensure the elastic performance and the service life of the elastic element 400, the misumi memory rubber is preferably used for 3 thousands of times without deformation, and the common sealing rubber can only be used for thousands of times. The entire airtightness testing apparatus, including the housing 100, the piston member 200, the lock member 300, etc., except for the elastic member 400, is made of a metal material, preferably 7000-series aluminum alloy. The 7000 series aluminum alloy material dead weight is light, can not have because airtight testing arrangement self dead weight is too big and lead to the leakproofness bad. Meanwhile, the aluminum alloy is not rusted and has long service life.

The casing 100 is in a shape of a circular tube with openings at two ends, the tube diameter of the casing is larger than the outer diameter of the pressure release valve, so that the front part of the casing 100 can be ensured to smoothly cover the pressure release valve 500; it is also possible to ensure that the casing 100 is in light contact with the relief valve 500 in the free state and is firmly coupled with the relief valve 500 without dropping and sealing in the operating state, as shown in fig. 5 and 6. Fig. 7 is a full view of the airtight detecting device for sealing the lower case of the battery pack. The short length of the tube of the housing 100 brings the center of gravity of the air tightness detecting device forward, facilitating its firm engagement with the pressure relief valve 500 during plugging. The front end of the housing 100 extends into the housing to form an inner edge 110, and the inner edge 110 is indispensable as a limiting component of the elastic member 400. The inner rim 110 is provided with four positioning notches 120 to be engaged with the screws 530 of the pressure relief valve 500, so that the elastic member 400 is easily aligned with the air outlet holes 510 of the pressure relief valve 500, as shown in fig. 5.

It should be noted that the above circular tube shape of the housing 100 and the number of positioning notches 120 are designed to match the relief valve 500 shown in fig. 5. The design of the air tightness detecting device of this patent is not limited thereto, and the housing 100 includes, but is not limited to, a circular tube shape, and may have other shapes such as an oval shape, a rounded rectangle shape, and the like. The number and position of the positioning notches 120 are not limited to those shown in fig. 2, and may be set according to the shape of the relief valve 500 and the set screws.

The inner wall of the housing 100 is provided with a plurality of grooves 220 for cooperating with the ribs 210 of the outer wall of the piston member 200. The extending part 130 is installed at the rear end of the housing 100, and the extending part 130 is provided with a rotation shaft hole for installing the locking member 300. Preferably, the extension 130 is integrally formed with the housing 100 to ensure strength and durability.

The piston member 200 is a solid body in appearance, and has a hollow interior in order to reduce its weight. The front end of the piston member 200 is extended forward at its outer circumference to form a flange for abutting against the elastic member 400. This flange also has four recesses that mate with four detents 520 of the relief valve 500. The outer wall of the piston member 200 is provided with four ribs 210, and the ribs 210 are installed in the grooves 220 of the housing 100, so that the piston member 200 slides back and forth in the housing 100 instead of rotating. The rear end surface of the piston member 200 is a flat surface that is in contact mating with the flat surface 322 of the latch member 300, as shown in fig. 3.

As shown in fig. 3 and 4, the locking member 300 is composed of a rotating shaft 310, a locking member main body 320 and a handle 330, which may be integrally formed by a same material, or may be fixed together in a suitable manner after being separately processed. The extension 130 of the housing 100 is a semicircular ring, and two ends of the extension are provided with a rotating shaft hole, and the rotating shaft 310 is installed in the rotating shaft hole; when the lock member 300 rotates around the rotation shaft 310, the lock member 300 pushes the piston member 200 toward the front end of the housing 100. To achieve the above object, the locker body 320 needs to be specially designed: the locking member main body 320 is a rectangular parallelepiped, and the surface of the locking member main body contacting the rear end surface of the piston member 200 is a combination of the curved surface 321 and the flat surface 322, and the combination of the curved surface 321 and the flat surface 322 is in smooth transition.

The curved surface 321 may take the following two forms: (1) the curved surface 321 is a part of a cylindrical surface, and the rotation axis 310 is deviated from the axis of the cylindrical surface, so that the distance between the tangent line (the curved surface 321 is tangent to the rear end surface of the piston member 200) and the rotation axis 310 is changed continuously as the locking member 300 rotates around the rotation axis 310, so that the locking member 300 pushes the piston member 200 forward; (2) the curved surface 321 is a curved surface with variable curvature, and needs to meet the requirement: as the locking member 300 rotates around the rotation shaft 310, the distance between the tangent line (the curved surface 321 is tangent to the rear end surface of the piston member 200) and the rotation shaft 310 changes, so that the locking member 300 pushes the piston member 200 forward. When the lock member 300 is locked in place, the flat surface 322 is in integral contact with the rear end surface of the piston member 200. In order to enable the locking member main body 320 to rotate easily, a handle 330 is installed at the tail portion of the locking member main body, and the force application size of an operator is reduced by utilizing the lever principle, so that the locking member main body meets the human engineering.

The elastic member 400 is an annular rubber member, and is installed between the inner rim 110 and the front end surface of the piston member 200. When the piston member 200 is pushed toward the front end portion of the housing 100, a spatial distance between the front end surface of the piston member 200 and the front edge 110 of the housing 100 becomes smaller; the elastic member 400 is located right in the space, and is inevitably expanded by being pressed, and then deformed toward the center line of the housing, and finally compresses and blocks the air outlet 510. The elastic member 400 is provided with four grooves 410, which are engaged with the positioning portions 520 of the pressure relief valve 500, i.e. the four grooves 410 are sleeved on the four positioning portions 520. Due to the design, the elastic piece 400 can be prevented from rotating in the deformation process, and the blocking of the air outlet 510 by the elastic piece 400 is enhanced.

Fig. 5 shows an external appearance structure of a relief valve 500 to which the airtightness detection apparatus is directed. The pressure release valve 500 is mounted on the lower shell of the battery pack through four screws 530, the main body of the pressure release valve 500 is a flat cylinder protruding out of the side wall of the battery pack, four positioning portions 520 are uniformly distributed on the peripheral wall of the cylinder, and a long strip-shaped air outlet 510 is formed in the wall surface between every two positioning portions 520, so that the four air outlet 510 are also uniformly distributed on the peripheral wall surface of the cylinder.

The structure of the air tightness detecting device in a preferred embodiment of the present invention is described above in detail, and the external structure of the pressure release valve is described briefly, and the working manner of plugging the pressure release valve by the air tightness detecting device is described in detail below, including the following steps:

step 1: the handle 330 is operated such that the axis of the handle 330 is parallel to the axis of the housing 100. At this time, the distance between the inner rim 110 of the housing and the front end surface of the piston member 200 is maximized, and the elastic member 400 is in a relaxed state.

Step 2: the air tightness testing device is sleeved on the pressure release valve 500, the four positioning grooves 410 of the elastic piece 400 are sleeved on the four positioning parts 520 of the pressure release valve 500, and the air tightness testing device and the pressure release valve are basically firm.

And step 3: the operator holds the lower portion of the housing 100 of the air tightness detecting device with one hand and operates the handle 330 with the other hand such that the axis of the handle 330 is perpendicular to the axis of the housing 100. At this time, the distance between the inner rim 110 of the housing and the front end surface of the piston member 200 is minimized, and the elastic member 400 is in a set maximum expansion state. As the elastic member 400 expands, it blocks the four air outlet holes 510 of the pressure relief valve 500, and then performs the air tightness test of the battery pack.

And 4, step 4: the handle 330 is operated again to return to the parallel state between the axis of the handle 330 and the axis of the housing 100. At this time, the elastic member 400 is loosened, and it is restored to its original shape by its own elastic force and is no longer in close contact with the relief valve, so that the airtightness detecting apparatus can be removed from the relief valve 500.

For relief valve plugging device and method among the prior art, the utility model provides an airtight detection device of shutoff battery package relief valve has following characteristics:

(1) the mode of sealing the side face of the pressure release valve is ingeniously adopted for sealing, and the tightness between the pressure release valve and the lower shell can be detected by the gas detection equipment.

(2) By adopting the expansion type compression sealing mode, the sealing ring has the sealing function and also has the fixing function.

(3) Similar to the toggle clamp type clamping mode, damage of the air tightness detection device to the pressure release valve due to overlarge operating force is avoided.

(4) Each part of the air tightness testing device can be independently disassembled, the maintenance and the replacement are convenient, and the manufacturing and using cost is low.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides an airtight detection device of shutoff battery package relief valve which characterized in that includes:

a piston member movable within the housing;

a latch with a shaft by which the latch is mounted at the second end of the housing, the latch configured to: when the locking piece rotates around the rotating shaft, the locking piece jacks the piston piece towards the first end of the shell;

an elastic member mounted between the inner edge and a front end surface of the piston member, the elastic member configured to: the elastic member is compressed and expanded when the piston member is urged toward the first end of the housing.

2. The airtightness detection device for plugging the pressure release valve of the battery pack according to claim 1, wherein the inner wall of the housing is provided with at least two grooves, and the outer wall of the piston member is provided with a rib used in cooperation with the grooves.

3. The device of claim 1, wherein the first end of the housing is provided with a positioning hole.

4. The airtightness detection apparatus according to claim 1, wherein an extension portion is mounted at the second end of the casing, and the extension portion is provided with a rotation shaft hole for mounting the rotation shaft.

5. The device of claim 1, wherein the locking member has a handle.

6. The airtightness detection device for plugging the pressure release valve of the battery pack according to claim 1, wherein a portion of the locking member, which is in contact with the rear end surface of the piston member, is a combination of a curved surface and a flat surface.

7. The airtightness detection apparatus according to claim 6, wherein a distance between the curved surface and the central axis of the rotation shaft changes smoothly.

8. The device of claim 6, wherein the plane is configured to: when the locking piece is locked in place, the plane is in integral contact with the rear end face of the piston piece.

9. The airtightness detection apparatus for closing the pressure release valve of the battery pack according to claim 1, wherein the elastic member is made of rubber.

10. The airtightness detection apparatus according to claim 9, wherein parts of the airtightness detection apparatus other than the elastic member are formed by processing an aluminum alloy.