CN220380701U

CN220380701U - Tightness detection clamp and battery cell tightness detection device

Info

Publication number: CN220380701U
Application number: CN202322023168.1U
Authority: CN
Inventors: 糜伟; 袁世豪; 唐书霞
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-01-23
Anticipated expiration: 2033-07-31

Abstract

The application discloses sealing member detects anchor clamps and electric core tightness detection device, through putting into flexible cavity in the accommodation space that bears the seat, and flexible cavity's the top opening of putting into the mouth and stretching out from accommodation space, just so can put into flexible cavity with the electric core that is surveyed, because the gravity of being surveyed the electric core can be with the bottom of flexible cavity at accommodation space, support the electric core that is surveyed through bearing the seat, then establish the apron lid on bearing the seat again, with opening and put into mouthful sealed, vacuum pipeline through wearing to establish on the apron like this carries out the evacuation to flexible cavity, flexible cavity will warp inwards shrink under external atmospheric pressure effect, the evacuation is fast, detection efficiency is high, flexible cavity can be hugged closely and is extruded by the electric core at the electric core surface that is surveyed moreover, thereby can play the effect that prevents electric core inflation.

Description

Tightness detection clamp and battery cell tightness detection device

Technical Field

The utility model relates to the technical field of battery detection, in particular to a tightness detection clamp and a battery cell tightness detection device.

Background

With the rapid development of new energy industry, especially the rapid development of electric automobiles, the application of batteries is increasingly wide, and the requirements on the safety of the batteries are also higher.

Air tightness is an important index affecting the safety performance of the battery. In the actual production process, the leakage detection is usually required to be performed on the battery cell so as to determine whether the air tightness of the battery cell meets the requirement. The common gas tightness detection method is to inject a certain amount of leakage gas such as helium into the battery cell, then put the battery cell into the internal cavity of the clamp, vacuumize the internal cavity of the clamp, and then judge the gas tightness of the battery cell by detecting the leakage gas.

However, the inventor researches that the clamp is made of rigid materials, when the internal cavity of the clamp is subjected to vacuum, the internal cavity of the clamp is not compressed, the vacuum pumping speed is low, and the detection time is long, so that a large amount of space exists between the battery cell and the clamp, and if the external pressure of the battery cell is smaller than the internal pressure, the battery cell can bulge.

Disclosure of Invention

The utility model aims to provide a tightness detection clamp and a battery cell tightness detection device, which can improve detection efficiency and play a role in preventing battery cells from swelling.

In a first aspect, the present utility model provides a tightness detection clamp comprising:

the bearing seat is provided with an accommodating space with an opening at the top;

the flexible cavity is arranged in the accommodating space, the top of the flexible cavity is provided with an accommodating opening, the accommodating opening extends out of the opening, and the accommodating opening can be used for allowing a power supply core to pass through so that the power supply core is accommodated in the flexible cavity;

and the cover plate is covered on the bearing seat so as to seal the opening and the placing opening, wherein the cover plate is provided with a vacuum pipeline in a penetrating way, and the vacuum pipeline is communicated with the placing opening.

In an alternative embodiment, an outward extending ring is formed on the flexible cavity and on the outer peripheral side of the insertion opening, and the extending ring is co-extruded by the bearing seat and the cover plate.

In an alternative embodiment, the lower surface of the cover plate is provided with a concave groove, and the top of the flexible cavity is embedded in the concave groove.

In an optional embodiment, the tightness detection fixture further comprises a battery cell positioning base, the battery cell positioning base presses the bottom of the flexible cavity to the bottom of the accommodating space, and a positioning groove is formed in the battery cell positioning base so as to put the battery cell in.

In an alternative embodiment, the number of the positioning grooves is a plurality, and the inner diameter sizes of the positioning grooves are sequentially reduced from top to bottom.

In an alternative embodiment, each positioning slot includes a first slot and a second slot in cross communication, each of the first slot and the second slot being capable of receiving a power supply.

In an alternative embodiment, the bearing seat is in a frame structure and comprises a bottom plate, a plurality of support columns and a top ring, wherein the support columns are vertically connected to the bottom plate at intervals in the circumferential direction, the top ring is connected to the tops of the support columns, and the inner circumferential surface of the top ring forms the opening.

In an alternative embodiment, the flexible cavity is made of rubber.

In an alternative embodiment, the cover plate is provided with a gas injection pipeline communicated with the inlet in a penetrating way.

In a second aspect, the present utility model provides a device for detecting tightness of a battery cell, including a tightness detection fixture according to any of the foregoing embodiments.

The beneficial effects of the embodiment of the utility model include:

through putting into flexible cavity in the accommodation space of bearing seat, and flexible cavity's the mouth of putting stretches out from accommodation space's open-top, just so can put into flexible cavity with the battery cell that is surveyed, because the gravity of being surveyed the battery cell can be with the bottom of flexible cavity at accommodation space's bottom, support the battery cell that is surveyed through bearing seat, then establish the apron lid on bearing seat, with opening and mouth seal, vacuum pumping is carried out to flexible cavity through the vacuum pipe who wears to establish on the apron like this, flexible cavity will warp inwards shrink under external atmospheric pressure effect, the evacuation speed is fast, detection efficiency is high, flexible cavity can be hugged closely at the battery cell surface that is surveyed and squeeze to the battery cell that is surveyed moreover, thereby can play the effect that prevents the battery cell bulge.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of an embodiment tightness detection clamp;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a perspective view of the bearing seat of the present embodiment;

FIG. 4 is a perspective view of the cover plate of the present embodiment;

fig. 5 is a perspective view of the cell positioning base of the present embodiment.

Icon: 10-a bearing seat; 12-a bottom plate; 14-supporting columns; 16-top ring; 161-opening; 18-an accommodation space; 30-a flexible cavity; a 32-extension ring; 34-an inlet; 50-cover plate; 52-a vacuum pipe; 54-gas injection pipeline; 56-a concave groove; 70-a cell positioning base; 72-positioning grooves; 721-first positioning slot; 723-a second detent; 74-a first groove; 76-second groove.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

At present, from the development of market situation, the power battery is widely used because of the advantages of long storage time, high power density, high energy density and the like. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

Air tightness is an important index affecting the safety performance of the battery. In the actual production process, the leakage detection is usually required to be performed on the battery cell so as to determine whether the air tightness of the battery cell meets the requirement.

The common gas tightness detection method is to inject a certain amount of leakage gas such as helium into the battery cell, then put the battery cell into the internal cavity of the clamp, press the cover plate 50 and the clamp to seal the internal cavity of the clamp, then vacuumize the internal cavity of the clamp, and then judge the gas tightness of the battery cell by detecting whether the leakage gas leaks from the battery cell.

However, the fixture is made of rigid materials, when the internal cavity of the fixture is subjected to vacuum, the internal cavity of the fixture is not compressed, the vacuum pumping speed is low, the detection time is long, the detection efficiency is low, a large amount of space exists between the battery cell and the fixture, and if the external pressure of the battery cell is smaller than the internal pressure, the battery cell can bulge.

The inventors have studied and have proposed the following examples for improvement. Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1 and 2, the present embodiment discloses a tightness detection fixture, which includes a bearing seat 10, a flexible cavity 30 and a cover plate 50. The carrier 10 has an accommodation space 18 with a top opening 161. The flexible cavity 30 is arranged in the accommodating space 18, the top of the flexible cavity 30 is provided with an inlet 34, the inlet 34 extends out of the opening 161, and the inlet 34 can pass through a power supply core so that the power supply core is placed in the flexible cavity 30; the cover plate 50 is covered on the bearing seat 10 to seal the opening 161 and the placement opening 34, wherein the cover plate 50 is provided with a vacuum pipeline 52 communicated with the placement opening 34.

In this way, the flexible cavity 30 is placed in the accommodating space 18 of the bearing seat 10, the placement opening 34 of the flexible cavity 30 extends out of the top opening 161 of the accommodating space 18, so that the tested battery cell can be placed in the flexible cavity 30, the bottom of the flexible cavity 30 can be pressed at the bottom of the accommodating space 18 due to the gravity of the tested battery cell, the tested battery cell is supported by the bearing seat 10, then the cover plate 50 is covered on the bearing seat 10 to seal the opening 161 and the placement opening 34, the flexible cavity 30 is vacuumized through the vacuum pipeline 52 penetrating through the cover plate 50, the flexible cavity 30 can be deformed and contracted inwards under the action of external air pressure, the vacuumizing speed is high, the detection efficiency is high, and the flexible cavity 30 can be tightly attached to the surface of the tested battery cell and can squeeze the tested battery cell, so that the effect of preventing the battery cell from swelling can be achieved.

When the inside of the flexible cavity 30 is vacuumized through the vacuum pipe 52, if gaps, holes and the like exist in the battery cell, leakage gas such as helium in the measured battery cell can escape into the flexible cavity 30 outside the battery cell, and then the leakage gas is discharged through the vacuum pipe 52 to be recognized and detected by a detecting instrument such as a helium detector, and then NG is judged. If the detecting instrument does not detect the leakage gas after the vacuumizing reaches the preset time, the air tightness of the battery cell is judged to be qualified, the vacuumizing is stopped at the moment, and then the cover plate 50 is opened to take out the tested battery cell.

The flexible cavity 30 is made of a material (such as rubber) with high elasticity and good sealing property, so that when the inside of the flexible cavity 30 is vacuumized, the flexible cavity 30 is convenient to deform and cling to the surface of the tested battery cell, and the strength of the tested battery cell shell is far greater than that of the flexible cavity 30, so that the flexible cavity 30 can shrink inwards under the action of external air pressure instead of the tested battery cell expanding outwards.

In this embodiment, the cover plate 50 is further provided with a gas injection pipe 54 in communication with the inlet 34, so that gas can be filled into the flexible cavity 30 through the gas injection pipe 54, and thus the vacuum pumping is stopped after NG is judged, and then cleaning gas such as nitrogen gas, which is different from the leakage gas, is filled into the flexible cavity 30 through the gas injection pipe 54, so as to clean the leakage gas such as helium gas which may possibly remain in the flexible cavity 30.

Referring to fig. 3, the bearing seat 10 is a frame structure, and includes a bottom plate 12, a plurality of support columns 14 and a top ring 16, wherein the support columns 14 are vertically connected to the bottom plate 12 at intervals in a circumferential direction, the top ring 16 is connected to the tops of the support columns 14, so that the bottom plate 12, the support columns 14 and the top ring 16 together enclose an accommodating space 18, and an opening 161 is formed on an inner circumferential surface of the top ring 16.

In this way, the top opening 161 of the flexible cavity 30 extends from the top ring 16, the battery cell is pressed on the bottom plate 12 after being placed into the flexible cavity 30, and the bottom plate 12 and the top ring 16 are connected through the support columns 14, so that the whole bearing seat 10 is in a frame structure, the permeability of the flexible cavity 30 and the external environment is better, and the flexible cavity 30 can be more easily contracted and deformed inwards after being vacuumized.

In the present embodiment, the outer peripheral side of the re-placement opening 34 on the flexible cavity 30 is formed with the outward extending ring 32, and the extending ring 32 is co-extruded by the top ring 16 and the cover plate 50 of the carrier 10, so that the extending ring 32 can be inserted between the cover plate 50 and the top ring 16, and after the cover plate 50 and the top ring 16 are fastened, the upper and lower surfaces of the extending ring 32 are respectively pressed to achieve the sealing between the cover plate 50 and the top ring 16, so that the cover plate 50 and the flexible cavity 30 can also be sealed, thereby achieving the sealing effect of sealing the placement opening 34 and the top opening 161.

In addition, referring to fig. 4, a concave groove 56 is provided on the lower surface of the cover plate 50, and the top of the flexible cavity 30 is embedded into the concave groove 56, so that the top of the flexible cavity 30 is embedded with the inner wall of the concave groove 56, thereby further improving the sealing effect between the cover plate 50 and the flexible cavity 30.

Referring to fig. 5, in the present embodiment, the tightness detection fixture further includes a battery cell positioning base 70, where the battery cell positioning base 70 presses the bottom of the flexible cavity 30 to the bottom of the accommodating space 18, that is, the battery cell positioning base 70 presses the bottom of the flexible cavity 30 to the bottom plate 12, and a positioning slot 72 is provided on the battery cell positioning base 70 to put in the battery cell.

Thus, the positioning groove 72 on the battery cell positioning base 70 is used for placing the battery cell, so that the position of the battery cell can be conveniently positioned, the preparation time before vacuum pumping is shortened, and the detection efficiency is improved.

The quantity of constant head tank 72 is a plurality of, and reduces in proper order from last internal diameter size down and set up to can adapt to not unidimensional electric core, place at the constant head tank 72 that the degree of depth is lighter to the electric core that the size is great, prevent at darker constant head tank 72 to the electric core that the size is less, can both can carry out accurate location through electric core positioning base 70 assurance not unidimensional electric core like this, compatible scope is big, electric core type change is fast and with low costs.

In this embodiment, the number of the positioning slots 72 is two, and the positioning slots are divided into a first positioning slot 721 and a second positioning slot 723, wherein the inner diameter of the first positioning slot 721 is larger than that of the second positioning slot 723, and the second positioning slot 723 is formed at the bottom of the first positioning slot 721, that is, the first positioning slot 721 and the second positioning slot 723 are sequentially arranged from top to bottom, the first positioning slot 721 is used for positioning a cell with a larger size, and the second positioning slot 723 is used for positioning a cell with a smaller size.

Each of the positioning slots 72 includes a first slot 74 and a second slot 76 in cross communication, each of the first slot 74 and the second slot 76 being capable of receiving a power supply. Specifically, the first slot 74 and the second slot 76 of the first positioning slot 721 are configured to accommodate different sized battery cells, and the first slot 74 and the second slot 76 of the second positioning slot 723 are also configured to accommodate different sized battery cells, thereby further improving the compatibility range.

In addition, this embodiment also discloses a battery cell tightness detection device, this battery cell tightness detection device includes the tightness detection anchor clamps of above-mentioned embodiment, still include evacuating device in addition, detecting instrument and gas injection device, gas injection device communicates with gas injection pipeline 54, vacuum pipeline 52, evacuating device and detecting instrument communicate in proper order, evacuating device carries out the evacuation to flexible cavity 30 through vacuum pipeline 52, in order to make the gas in the flexible cavity 30 enter into the detecting instrument at terminal, detecting instrument can discern and detect the leakage gas, gas injection device then is used for injecting inert gas in order to discharge the leakage gas out of flexible cavity 30 through gas injection pipeline 54 towards flexible cavity 30.

In summary, this embodiment discloses a sealing member detection fixture and a device for detecting tightness of a battery cell, by placing a flexible cavity 30 in a receiving space 18 of a bearing seat 10, and a placement opening 34 of the flexible cavity 30 extends out of a top opening 161 of the receiving space 18, so that a battery cell to be tested can be placed in the flexible cavity 30, since the gravity of the battery cell to be tested can press the bottom of the flexible cavity 30 to the bottom of the receiving space 18, the battery cell to be tested is supported by the bearing seat 10, and then a cover plate 50 is covered on the bearing seat 10 to seal the opening 161 and the placement opening 34, so that the flexible cavity 30 is vacuumized through a vacuum pipe 52 penetrating through the cover plate 50, the flexible cavity 30 is deformed and contracted inwards under the action of external air pressure, the vacuuming speed is high, and the flexible cavity 30 can be tightly attached to the surface of the battery cell to be tested and squeeze the battery cell to be tested, thereby playing a role of preventing the battery cell from swelling.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A tightness detection clamp, comprising:

2. The tightness detecting jig according to claim 1, wherein an outwardly extending ring is formed on an outer peripheral side of the flexible cavity body further than the inlet port, the extending ring being co-extruded by the bearing seat and the cover plate.

3. The tightness detection clamp according to claim 1, wherein a lower surface of the cover plate is provided with a concave groove, and a top of the flexible cavity is embedded in the concave groove.

4. The tightness detection clamp according to claim 1, further comprising a cell positioning base that presses the bottom of the flexible cavity against the bottom of the accommodation space, wherein a positioning groove is provided on the cell positioning base to put in the cell.

5. The tightness detecting jig according to claim 4, wherein the number of the positioning grooves is plural, and the inner diameter dimension is decreased in order from top to bottom.

6. The tightness detection clamp of claim 5 wherein each of the positioning slots comprises a first slot and a second slot in cross communication, each of the first slot and the second slot being capable of receiving a power supply.

7. The tightness detection clamp according to claim 1, wherein the bearing seat is of a frame structure and comprises a bottom plate, a plurality of support columns and a top ring, the support columns are vertically connected to the bottom plate at intervals in the circumferential direction, the top ring is connected to the tops of the support columns, and the inner circumferential surface of the top ring forms the opening.

8. The tightness detection clamp according to claim 1, wherein the flexible cavity is made of rubber.

9. The tightness detection clamp according to claim 1, wherein the cover plate is provided with a gas injection pipe communicated with the inlet.

10. A cell tightness detection device, characterized by comprising the tightness detection jig according to any one of claims 1 to 9.