A cylindrical battery manual pressing device

Abstract

The utility model belongs to cylindrical lithium cell airtightness detection technical field, concretely is a kind of cylindrical battery manual press device, by roof, support column, bottom plate constitute main frame, four support columns are connected by screw with roof, bottom plate, still include two clamping mould that form the clamping of electric core, the moving mechanism that can respectively drive clamping mould translation is installed on the bottom plate;The roof is provided with press mechanism and is penetrated, and press mechanism includes fixed sleeve fixed on the roof and gas rod screw-connected in fixed sleeve, and gas rod is equipped with threaded portion on it;It can be understood that, to replace helium with compressed gas or nitrogen to press, reduce the verification cost of small batch or experimental sample stage;Manual threaded gas rod is adjusted to compact force with nut, avoid the deformation or air leakage of battery cover plate due to improper air pressure, and flexibility is higher;Overall structure omits cylinder, solenoid valve and other components, and it is small in size, simple in processing and easy to transport.

Description

Technical Field

[0001] This utility model belongs to the field of cylindrical lithium battery airtightness testing technology, and in particular relates to a manual pressure testing device for cylindrical batteries. Background Technology

[0002] Lithium-ion batteries, as the most widely used energy storage devices, are widely applied in various industries due to their unique performance advantages. Cylindrical lithium-ion batteries, as an important type, are used in electric vehicles, digital electronics, and base station backup power due to their shock resistance and resistance to expansion. During their production, airtightness testing and the opening pressure of the explosion-proof valve (pressure relief valve) are extremely critical safety indicators: if the battery's airtightness is poor, external moisture and impurities can easily seep into the casing, leading to electrolyte deterioration and electrode corrosion, potentially causing short circuits, bulging, and other hazards; and in the event of thermal runaway, the internal pressure rises, and whether the explosion-proof valve can open normally under the set pressure directly affects the safety and reliability of the battery system.

[0003] Ensuring the airtightness of grooved sealed batteries relies heavily on the sealing process, the quality of the welding at the seal, and the design of the explosion-proof valve. If the grooved seal or welding is not tight, it can create tiny leakage channels; if the explosion-proof valve fails to open properly, it could lead to a battery explosion.

[0004] However, existing airtightness testing methods mostly use helium and sensor equipment, which are costly for small batches or experimental samples. At the same time, the commonly used cylinder clamping device is not easy to adjust—excessive pressure can cause the cover plate to bend and deform, interfering with the test results, while insufficient pressure may cause air leakage.

[0005] To address the aforementioned issues, this application proposes a manual pressure testing device for cylindrical batteries. Utility Model Content

[0006] The purpose of this invention is to provide a manual pressure testing device for cylindrical batteries, which solves the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model is a manual pressure device for cylindrical batteries, which consists of a top plate, support columns, and a bottom plate forming the main frame. The four support columns are connected to the top plate and the bottom plate by screws. It also includes two clamping molds that clamp the battery cells. The bottom plate is equipped with a moving mechanism that can drive the clamping molds to move.

[0009] A pressure-pressing mechanism is provided through the top plate. The pressure-pressing mechanism includes a fixed sleeve fixed to the top plate and a gas rod spirally connected to the fixed sleeve. The gas rod has a threaded part, and the inner side of the fixed sleeve also has a thread that spirally engages with the threaded part. After rotation, the fixed sleeve and the gas rod will produce vertical relative displacement. The gas rod has an axially penetrating air pipe inside. A rubber sleeve is fitted and connected to the bottom of the gas rod, and the rubber sleeve has a through hole corresponding to the air pipe.

[0010] Furthermore, a groove is formed on the upper outer part of the battery cell, and a clamping opening is formed on the side of the clamping mold near the battery cell that corresponds to the groove.

[0011] Furthermore, the moving mechanism includes a push seat mounted on the base plate and a screw screw helically connected to the push seat. One end of the screw screw is connected to a rotating rod, and the other end of the screw screw is rotatably connected to a clamp. Several guide rods that slide in cooperation with the push seat are also fixed on the clamp.

[0012] Furthermore, the clamping mold is detachably fixed to the clamping seat.

[0013] Furthermore, the bottom of the gas rod is formed with a groove that fits into the rubber sleeve with an interference fit, and the surface of the gas rod connecting to the rubber sleeve is formed with annular ribs.

[0014] Furthermore, a screw head is formed at the outer top of the gas rod.

[0015] Furthermore, the top of the air tube in the air rod is formed with an internal thread that engages with the quick plug screw.

[0016] Furthermore, the outside of the gas rod is provided with a nut that abuts against the fixing sleeve via a threaded portion.

[0017] Furthermore, the base plate is provided with a transparent protective cover that covers the pressing device. The transparent protective cover has a cuboid structure, and the back of the transparent protective cover and the parts corresponding to the moving mechanism and the pressing mechanism are all open.

[0018] This utility model has the following beneficial effects:

[0019] This invention uses compressed gas and nitrogen to pressurize the product, eliminating the need for helium and reducing the inspection costs for initial product verification during small-batch production or experimental sample production.

[0020] This utility model uses a threaded air rod for manual up-and-down adjustment, which is fixed with a nut. Compared with using a cylinder, it is more flexible and can manually apply the pressure of the air rod cover plate, avoiding deformation or air leakage of the battery cover plate due to excessive or insufficient air pressure in the cylinder.

[0021] This utility model has no cylinders, no solenoid valves or other components, is small in size, and is simple to manufacture and easy to transport;

[0022] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0026] Figure 3 This is a partially cut and enlarged structural diagram of the air column;

[0027] Figure 4 A cross-sectional view showing the rubber sleeve tightly abutting against the injection platform;

[0028] Figure 5 This is a top-view structural diagram of the battery cell;

[0029] Figure 6 This is a schematic diagram of the structure of the battery cell and the clamping mold assembly.

[0030] Figure 7 This is a schematic diagram of the structure of the battery cell in this utility model, which is used to test the sealing performance through the valve port.

[0031] Figure 8 for Figure 7 A schematic diagram of the structure of the battery cell;

[0032] The attached diagram lists the components represented by each number as follows:

[0033] In the diagram: 1. Quick plug; 2. Air rod; 201. Air pipe; 202. Settling tank; 203. Threaded part; 204. Tightening head; 205. Ring rib; 3. Nut; 4. Fixing sleeve; 5. Top plate; 6. Transparent protective cover; 7. Support column; 8. Push seat; 9. Rotating rod; 10. Screw; 11. Base plate; 12. Guide rod; 13. Clamp; 14. Battery cell; 1401. Liquid injection platform; 1402. Liquid injection port; 1403. Valve port; 1404. Rubber ring; 1405. Groove; 1406. Cover plate; 1407. Aluminum sheet; 1408. Weld seam; 15. Clamping mold; 1501. Clamping opening; 16. Rubber sleeve. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Example 1

[0037] Please see Figure 1 - Figure 6 As shown, this utility model is a manual pressure testing device for a cylindrical battery, used for sealing testing of the battery cell 14. The liquid injection platform 1401 is formed in the middle of the upper end of the battery cell 14, and the liquid injection port 1402 penetrates the liquid injection platform 1401 into the inside of the battery cell 14. The valve port 1403 is formed on the battery cell 14 by sheet metal. Under normal conditions, the valve port 1403 is in a closed state. The cover plate 1406 is sealed and installed on the battery cell 14 by the rubber ring 1404. In this embodiment, compressed gas or nitrogen is injected into the battery cell 14 through the liquid injection port 1402 for airtightness testing of the rubber ring 1404 and the valve port 1403. The valve port 1403 is the interface of an explosion-proof valve or a pressure relief valve.

[0038] Specifically, the manual pressing device consists of a top plate 5, support columns 7, and a bottom plate 11 forming the main frame. The four support columns 7 are connected to the top plate 5 and the bottom plate 11 by screws. It also includes two clamping molds 15 that clamp the battery cell 14. The bottom plate 11 is equipped with a moving mechanism that can drive the clamping molds 15 to move.

[0039] Furthermore, a slot 1405 is formed on the upper outer part of the battery cell 14, and a clamping opening 1501 is formed on the side of the clamping mold 15 near the battery cell 14, corresponding to the slot 1405.

[0040] Furthermore, the moving mechanism includes a push seat 8 mounted on the base plate 11 and a screw 10 screwed to the push seat 8. One end of the screw 10 is connected to a rotating rod 9, and the other end of the screw 10 is rotatably connected to a clamp 13. Several guide rods 12 that slide in cooperation with the push seat 8 are also fixed on the clamp 13. The front end of the guide rod 12 is fixedly installed to the clamp 13 by threads, and the rest of the rod body has a smooth surface, which plays a guiding role.

[0041] In use, first operate the moving mechanism at one end, and drive the screw 10 to rotate through the rotating rod 9. The screw 10 and the push seat 8 generate a helical displacement to push the clamping mold 15 to move. The guide rod 12 slides in the push seat 8. After adjusting to a suitable position, stop the movement of one side of the clamping mold 15. Hold the battery cell 14 with one hand and align the slot 1405 with the clamping opening 1501 of the clamping mold 15. Operate the moving mechanism at one end with the other hand until the two clamping molds 15 clamp the battery cell 14, thereby achieving the function of fixing the battery cell 14.

[0042] Furthermore, the clamping mold 15 is detachably fixed to the clamping base 13 by bolts. In actual use, the clamping mold 15 with the corresponding diameter can be replaced according to the size of the battery cell 14, thereby improving flexibility.

[0043] Specifically, a pressure-pressing mechanism is provided through the top plate 5. The pressure-pressing mechanism includes a fixed sleeve 4 fixed on the top plate 5 and a gas rod 2 spirally connected in the fixed sleeve 4. The gas rod 2 has a threaded part 203. The inner side of the fixed sleeve 4 also has a thread that spirally engages with the threaded part 203. After rotation, the fixed sleeve 4 and the gas rod 2 will have a vertical relative displacement. The gas rod 2 has an axially penetrating air pipe 201 inside. A rubber sleeve 16 is fitted and connected to the bottom of the gas rod 2. The rubber sleeve 16 has a through hole corresponding to the air pipe 201.

[0044] Furthermore, in order to ensure a stable and sealed connection between the rubber sleeve 16 and the air rod 2, a groove 202 is formed at the bottom of the air rod 2 to fit the rubber sleeve 16 with an interference fit. An annular rib 205 is formed on the surface of the air rod 2 connecting the rubber sleeve 16. Multiple annular ribs 205 can be provided to achieve multi-stage sealing between the rubber sleeve 16 and the air rod 2.

[0045] Furthermore, the top of the air tube 201 in the air rod 2 is formed with an internal thread that screws into the quick plug 1, and the air rod 2 is connected to the external air circuit through the quick plug 1.

[0046] Furthermore, the top of the gas spring 2 is formed with a screw head 204, which makes it easy to manually or with tools to screw the gas spring 2 so that it can cooperate with the fixed sleeve 4 to form vertical displacement.

[0047] Furthermore, the outside of the air rod 2 is provided with a nut 3 through the threaded part 203 that abuts against the fixed sleeve 4. There are two nuts 3. When the air rod 2 and the fixed sleeve 4 are adjusted to the working position, the air rod 2 and the fixed sleeve 4 are further pressed by tightening the two nuts 3, so as to further fix the air rod 2.

[0048] Furthermore, the base plate 11 is provided with a transparent protective cover 6 that covers the pressing device. The transparent protective cover 6 is made of acrylic material with a cuboid structure. The back of the transparent protective cover 6 and the parts corresponding to the moving mechanism and the pressing mechanism are all open.

[0049] During use, after the battery cell 14 is fixed, loosen the two nuts 3 on the air rod 2, and turn the air rod 2 by turning the screw head 204. The moving force generated by the screw will push the air rod 2 down. When the rubber sleeve 16 is close to the battery cell 14, stop the operation. Then turn the rotating rod 9 on the two sets of moving mechanisms to adjust the position of the battery cell 14 and align the liquid injection port 1402 directly below the rubber sleeve 16. After that, continue to turn the air rod 2 down so that the rubber sleeve 16 seals against the liquid injection platform 1401. You can tell whether the rubber sleeve 16 is deformed by observing whether it is tight. Turn the two nuts 3 in sequence and press them on the upper end of the fixing sleeve 4 so that the battery cell 14 and the air rod 2 will not be displaced during the inflation process.

[0050] Place the transparent protective cover 6 on the base plate 11, pour water onto the surface of the cover plate 1406 through the back of the transparent protective cover 6, and connect the quick plug 1 to the external air pipe to complete the preparation work for the airtightness test.

[0051] Compressed air or nitrogen is injected into the battery cell 14 according to the set air pressure. Observe whether the rubber ring 1404 continuously produces air bubbles within a certain period of time. If so, there is an airtightness defect in the sealing process. If not, the airtightness is good. Observe whether the area around the valve port 1403 continuously produces air bubbles within a certain period of time. If so, there is an airtightness defect in the valve port 1403. If not, the sealing is good. Whether the valve port 1403 can be opened smoothly affects the safety performance of the battery.

[0052] If the valve 1403 is ruptured or burst open within a certain time after being filled with standard air pressure that can open the valve port 1403, it indicates that the valve port 1403 is designed reasonably. If it ruptures or bursts open prematurely below the opening air pressure or fails to rupture or burst open above the opening air pressure, it indicates that the valve port 1403 is designed unreasonably. This manifests as small air bubbles appearing at the rupture point of the valve port 1403 or through holes appearing after it bursts open.

[0053] Example 2

[0054] Please see Figure 7 - Figure 8 As shown, after the airtightness test of the rubber ring 1404 and valve port 1403 is completed through the injection port 1402 in Example 1, the aluminum sheet 1407 is placed on top of the injection port 1402 and welded at the gap to form a weld 1408. This example is used for the airtightness test of the weld 1408.

[0055] Manually open valve port 1403, adjust the position of battery cell 14 relative to air rod 2 through two sets of moving mechanisms, so that rubber sleeve 16 is sealed and connected with valve port 1403. Add water to the top surface of battery cell 14, and inject compressed air or nitrogen into battery cell 14 according to the set air pressure. Observe whether bubbles are continuously generated at weld 1408 within a certain period of time. If there are bubbles, it means that there is an airtightness defect in the sealing welding process. If there are no bubbles, it means that the airtightness is good.

[0056] Understandably, using compressed gas or nitrogen instead of helium for pressurization reduces the verification cost in small batches or experimental sample stages; the use of a manual threaded pneumatic rod with a nut to adjust the clamping force avoids deformation or leakage of the battery cover due to improper air pressure, providing greater flexibility; the overall structure eliminates components such as cylinders and solenoid valves, resulting in a smaller size, simpler processing, and easier transportation.

[0057] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A manual pressure testing device for a cylindrical battery, comprising a top plate (5), support columns (7), and a bottom plate (11) forming the main frame, wherein four support columns (7) are connected to the top plate (5) and the bottom plate (11) by screws, characterized in that: It also includes two clamping molds (15) that clamp the battery cell (14), and the base plate (11) is equipped with a moving mechanism that can drive the clamping molds (15) to translate respectively; A pressing mechanism is provided through the top plate (5). The pressing mechanism includes a fixed sleeve (4) fixed on the top plate (5) and an air rod (2) spirally connected in the fixed sleeve (4). The air rod (2) has a threaded part (203). The inner side of the fixed sleeve (4) is also provided with a thread that spirally engages with the threaded part (203). After rotation, the fixed sleeve (4) and the air rod (2) will have a vertical relative displacement. The air rod (2) has an axially penetrating air pipe (201) inside. The bottom of the air rod (2) is fitted with a rubber sleeve (16). The rubber sleeve (16) has a through hole corresponding to the air pipe (201).

2. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The upper part of the battery cell (14) is formed with a slot (1405), and the clamping mold (15) is formed with a clamping opening (1501) on the side near the battery cell (14) corresponding to the slot (1405).

3. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The moving mechanism includes a push seat (8) mounted on the base plate (11) and a screw (10) screwed to the push seat (8). One end of the screw (10) is connected to a rotating rod (9), and the other end of the screw (10) is rotatably connected to a clamp (13). Several guide rods (12) that slide with the push seat (8) are also fixed on the clamp (13).

4. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The clamping mold (15) is fixedly installed to the clamping seat (13) in a detachable manner.

5. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The bottom of the air rod (2) is formed with a groove (202) that fits into the rubber sleeve (16) with an interference fit. The surface of the air rod (2) connecting the rubber sleeve (16) is formed with annular ribs (205).

6. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The top of the gas rod (2) is formed with a screw head (204).

7. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The top of the air tube (201) in the air rod (2) is formed with an internal thread that is screwed into the quick plug (1).

8. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The gas rod (2) has a nut (3) on its outside through a threaded part (203) that abuts against the fixed sleeve (4).

9. The manual pressure testing device for cylindrical batteries according to claim 1, characterized in that: The base plate (11) is provided with a transparent protective cover (6) that covers the pressing device. The transparent protective cover (6) is a cuboid structure. The back of the transparent protective cover (6) and the parts corresponding to the moving mechanism and the pressing mechanism are all open.

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