Simple blasting device for voltage withstanding test of battery cell aluminum shell

Abstract

The invention relates to the technical field of lithium battery detection equipment, and discloses a simple blasting device for a voltage withstanding test of a battery cell aluminum shell, the simple blasting device comprises a detection box, the detection box comprises a box body and a cover body installed on the box body, and the cover body and the box body form a sealing cavity; a gas circuit box is arranged on one side of the box body, a gas outlet pipe is mounted in the gas circuit box, one end of the gas outlet pipe extends into the sealing cavity, and gas exhausted by the gas outlet pipe is blown into the battery cell aluminum shell; a connecting pipe is arranged in the gas circuit box and communicated with the gas outlet pipe, and a flow valve is arranged on the connecting pipe. According to the simple blasting device for the voltage withstanding test of the battery cell aluminum shell, all functions of an existing complex blasting device are simplified, only core functions are reserved, light weight is completed in structural design, the purchase cost of the device is greatly reduced, and the convenience of the device is improved; and the current situations of disorder and danger of the blasting test in the industry can be effectively improved with extremely low cost investment.

Description

Technical Field

[0001] The present invention relates to the technical field related to lithium battery testing equipment, and in particular to a simple blasting device for voltage withstand testing of an aluminum shell of a battery cell. Background Art

[0002] The safety of new energy vehicles has gradually received more and more attention, and hot news about car fires caused by battery pack failures has emerged in an endless stream. This requires major new energy manufacturers to invest more energy in improving the safety of battery packs and safety testing.

[0003] Generally speaking, as long as the cell module is prevented from severe collision, penetrating scratches and other destructive effects, the safety of the cell can be almost guaranteed. However, in rare cases, due to the failure of the thermal management system of the cell module, or the aging and abuse of the charging facilities, the cell will experience thermal failure, excessive lithium precipitation and other phenomena. At this time, the internal air pressure of the cell will rise. When the air pressure rises to a certain level, it will trigger the safety valve on the cell to release air and discharge pressure. Whether the safety valve can automatically release air and discharge pressure in time under the specified air pressure is an extremely important safety feature in the single cell. Due to the particularity of the cell structure, if there is an explosion test on the finished cell, it can only be done by drilling holes on the side wall of the cell and then filling the cell with air to test the safety of the cell. Because the threshold of the experiment is low, most companies directly connect the cell to the gas cylinder, and then use an explosion-proof box or explosion-proof cover to wrap the cell before starting the experiment. The existing ones generally need to be in explosion-proof boxes or explosion-proof covers which are not closed environments. If leakage occurs at the connection between the battery cell and the pipeline, it cannot be discovered in time, which affects the detection results to a certain extent. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes a simple blasting device for voltage withstand test of aluminum shell of battery core.

[0005] The present invention provides a simple blasting device for a withstand voltage test of an aluminum shell of a battery cell, comprising a test box, wherein the test box comprises a box body and a cover body mounted on the box body, wherein the cover body and the box body form a sealed cavity;

[0006] An air path box is provided on one side of the box body, an air outlet pipe is installed in the air path box, one end of the air outlet pipe extends to the sealed cavity, and the gas discharged from the air outlet pipe is blown into the aluminum shell of the battery core;

[0007] A connecting pipe is arranged in the air circuit box, the connecting pipe is communicated with the air outlet pipe, and a flow valve is arranged on the connecting pipe.

[0008] As a further optimization scheme of the present invention, the connecting pipe is connected to an air inlet pipe, and the external gas is pumped to the air inlet pipe, the connecting pipe and the air outlet pipe by an air pump, and the gas in the air outlet pipe is blown into the aluminum shell of the battery cell.

[0009] As a further optimized solution of the present invention, a main valve is provided on the air intake pipe, and the main valve can be a manual valve or a solenoid valve.

[0010] As a further optimized solution of the present invention, a total pressure gauge is provided on the connecting pipe. By observing the air pressure in the connecting pipe displayed by the total pressure gauge, it can be checked whether it meets the expected value. If not, it should be adjusted in time.

[0011] As a further optimized solution of the present invention, a puncture needle is provided on one side wall of the box body, and a telescopic member is provided inside the box body, and the telescopic member is used to drive the aluminum shell of the battery cell to move toward the puncture needle to puncture the aluminum shell of the battery cell.

[0012] As a further optimized solution of the present invention, an elastic protective member is further provided on the inner wall of the box body, and the elastic protective member is sleeved on the outer side of the puncture needle.

[0013] As a further optimized solution of the present invention, the elastic protective member has an elastic sealing sheet on the side away from the box body, and the elastic sealing sheet, the elastic protective member and the inner wall of the box body form a protective cavity. The puncture needle is located in the protective cavity. When the aluminum shell of the battery cell moves toward the puncture needle, the puncture needle first penetrates the elastic sealing sheet and then pierces the side wall of the aluminum shell of the battery cell.

[0014] As a further optimized solution of the present invention, a placement frame is installed in the box body, the placement frame is installed in the box body for transverse sliding, the telescopic end of the telescopic frame is connected to the placement frame, and the battery cell is placed in the placement frame.

[0015] As a further optimized solution of the present invention, a baffle frame is detachably mounted on the placement frame, and the baffle frame brings the battery core aluminum shell close to the puncture needle. When the battery core aluminum shell moves toward the puncture needle, the baffle frame contacts the elastic sealing sheet and squeezes the elastic sealing sheet to move toward the puncture needle so that the puncture needle penetrates the elastic sealing sheet, and then the puncture needle punctures the battery core aluminum shell to form a detection hole. Preferably, the puncture needle is conical, and the outer diameter of the puncture needle gradually decreases from the end away from the battery core aluminum shell to the end close to the battery core aluminum shell.

[0016] As a further optimized solution of the present invention, a connecting joint is provided on the inner wall of the box body, one end of the connecting joint is connected to the air outlet pipe, and the other end of the connecting joint extends into the detection hole of the aluminum shell of the battery cell and seals the detection hole.

[0017] As a further optimized solution of the present invention, the connecting joint includes a connecting pipe, which is connected to the air outlet pipe. The connecting pipe is externally sleeved with a conical elastic sealing portion, and the conical elastic sealing portion has a portion extending into the detection hole.

[0018] As a further optimized solution of the present invention, the battery core aluminum shell has a puncturing station and a detection station on the baffle frame. When the battery core aluminum shell is at the puncturing station, the telescopic frame drives the placement frame to approach the puncture needle, and the puncture needle punctures the battery core aluminum shell; when the battery core aluminum shell is in the detection station, when the telescopic member drives the placement frame to move close to the connecting joint, the connecting joint extends to the detection hole and the conical elastic sealing portion seals the measuring hole; then the telescopic member stops the action, that is, the cover body is covered to make the box body airtight, and then gas is blown into the battery core aluminum shell through the air inlet pipe, the connecting pipe, the air outlet pipe and the connecting joint to complete the blasting.

[0019] In the present invention, the simple blasting device proposed for the voltage withstand test of the aluminum shell of the battery cell simplifies the functions of the existing complex blasting device, retains only the core functions and achieves lightweight structure design, which greatly reduces the purchase cost of the device and improves the convenience of the equipment. It can effectively improve the chaotic and dangerous status of blasting tests in the industry with extremely low cost investment.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the gas circuit box of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure inside the box of the present invention;

[0024] Figure 4 This is a partial enlarged view of the elastic protective member in the box of the present invention;

[0025] Figure 5 A partial cross-sectional view of the elastic protective member of the present invention;

[0026] Figure 6 This is a schematic diagram of the connecting pipe structure of the present invention;

[0027] In the figure: 1. detection box; 10. box body; 11. cover body; 2. air circuit box; 3. outlet pipe; 4. connecting pipe; 5. flow valve; 6. inlet pipe; 7. total pressure gauge; 8. puncture needle; 9. telescopic part; 12. elastic protective part; 13. elastic sealing sheet; 14. placement frame; 15. baffle frame; 16. connecting pipe; 17. conical elastic sealing part. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] like Figure 1-Figure 6 A simple blasting device for a withstand voltage test of an aluminum shell of a battery cell is shown, comprising a test box 1, wherein the test box 1 comprises a box body 10 and a cover body 11 mounted on the box body 10, wherein the cover body 11 and the box body 10 form a sealed cavity;

[0030] Specifically, the box body 10 has an opening on the side, and the cover body 11 is installed on the box body 10 and is used to seal the cover opening. Preferably, a vertical slide groove is opened on the box body 10, and the cover body 11 has a connecting part connected to the slide groove. A sealing gasket is provided at the connection between the cover body 11 and the box body 10. Preferably, a handle is provided on the top of the cover body 11 to facilitate users to open or close the cover body 11.

[0031] An air circuit box 2 is provided on one side of the box body 10, and an air outlet pipe 3 is installed in the air circuit box 2. One end of the air outlet pipe 3 extends to the sealed cavity, and the gas discharged from the air outlet pipe 3 is blown into the aluminum shell of the battery core;

[0032] A connecting pipe 4 is provided in the air circuit box 2 , the connecting pipe 4 is communicated with the air outlet pipe 3 , and a flow valve 5 is provided on the connecting pipe 4 .

[0033] During the detection process, firstly, the battery core aluminum shell with the detection hole is placed in the box body 10, and the outlet pipe 3 and the sealing hole are sealed by the existing sealant, and then the cover body 11 is covered, the flow valve 5 is opened, and then the gas source outside is blown into the battery core aluminum shell through the connecting pipe 4 and the outlet pipe 3 for detection. Preferably, in order to avoid the failure to detect whether there is leakage at the connection between the battery core aluminum shell and the outlet pipe 3 during the detection process, a pressure sensor (not shown in the figure) is also provided in the box body 10.

[0034] Preferably, the connecting pipe is connected to the air inlet pipe 6, and the external gas is pumped to the air inlet pipe 6, the connecting pipe 4 and the air outlet pipe 3 by an air pump, and the gas in the air outlet pipe 3 is blown into the aluminum shell of the battery cell.

[0035] Preferably, a main valve (not shown in the figure) is provided on the intake pipe 6. The main valve can be a manual valve or a solenoid valve. A total pressure gauge 7 is provided on the connecting pipe 4. The total pressure gauge 7 is close to the intake pipe 6 relative to the flow valve 5. In the initial stage of detection, the flow valve 5 is closed and the main valve is opened. The air pressure in the intake pipe 6 is displayed to ensure that the air pressure in the intake pipe 6 meets the expected value. If not, it should be adjusted in time.

[0036] Preferably, a puncture needle 8 is provided on one side wall of the box 10, and a telescopic member 9 is provided inside the box 10. The telescopic member 9 can be a member that can drive a member to reciprocate, such as an electric cylinder or a pneumatic cylinder in the prior art. In this embodiment, the telescopic member 9 is an electric cylinder, and the telescopic member 9 is used to drive the aluminum shell of the battery core to move toward the puncture needle 8 to puncture the aluminum shell of the battery core, thereby processing the detection hole on the aluminum shell of the battery core. Preferably, the puncture needle 8 is conical, and the outer diameter of the puncture needle 8 gradually decreases from the end away from the aluminum shell of the battery core to the end close to the aluminum shell of the battery core.

[0037] Preferably, an elastic protective member 12 is further provided on the inner wall of the box body 10, and the elastic protective member 12 is sleeved on the outside of the puncture needle 8. The elastic protective member 12 is a bellows, and there is a movable space between the inner wall of the elastic protective member 12 and the puncture needle 8, that is, the inner diameter of the elastic protective member 12 is much larger than the outer diameter of the puncture needle 8, thereby preventing the puncture needle 8 from being hit after the aluminum shell of the battery cell explodes.

[0038] Preferably, the elastic protective member 12 has an elastic sealing sheet 13 on the side away from the box body 10. The elastic sealing sheet 13 can be a rubber sheet. The elastic sealing sheet 13, the elastic protective member 12 and the inner wall of the box body 10 form a protective cavity. The puncture needle 8 is located in the protective cavity. When the aluminum shell of the battery cell moves toward the puncture needle 8, the puncture needle 8 first penetrates the elastic sealing sheet 13 and then pierces the side wall of the aluminum shell of the battery cell, thereby further protecting the puncture needle 8 without affecting the puncture of the aluminum shell of the battery cell.

[0039] Preferably, a placement frame 14 is installed in the box 10, the placement frame 14 is installed in the box 10 in a transverse sliding manner, the telescopic end of the telescopic frame is connected to the placement frame 14, and the battery core aluminum shell is placed in the placement frame 14. The placement frame 14 has a first limiting plate and a second limiting plate, the first limiting plate and the second limiting plate are arranged oppositely and in parallel, the first limiting plate and the second limiting plate are parallel to the inner wall of the box 10 where the puncture needle 8 is installed, and the first limiting plate and the second limiting plate are used for preliminary limiting of the battery core aluminum shell.

[0040] Preferably, a baffle 15 is detachably mounted on the placement frame 14, and the baffle 15 brings the aluminum shell of the battery cell close to the puncture needle 8. When the aluminum shell of the battery cell moves toward the puncture needle 8, the baffle 15 contacts the elastic sealing sheet 13 and squeezes the elastic sealing sheet 13 to move toward the puncture needle 8 so that the puncture needle 8 penetrates the elastic sealing sheet 13, and then the puncture needle 8 punctures the aluminum shell of the battery cell to form a detection hole. The baffle 15 is cylindrical and opposite to the elastic protective member 12. When puncturing, the baffle 15 is mounted on the placement frame 14, and when the withstand voltage test is performed, the baffle 15 is removed.

[0041] Preferably, a connecting joint is provided on the inner wall of the box body 10. Specifically, the air outlet pipe 3 is fixed on the box body 10, and one end of the connecting joint is first connected to the air outlet pipe 3 and fixed. An extension portion is provided on the connecting joint, and the extension portion is clamped on the box body 10 to prevent the connection between the connecting joint and the air outlet pipe 3 from loosening. The other end of the connecting joint extends into the detection hole of the aluminum shell of the battery cell and seals the detection hole.

[0042] Preferably, the connecting joint includes a connecting pipe 16, which is made of metal material. The connecting pipe 16 is connected to the exhaust pipe 3. The outer sleeve of the connecting pipe 16 is provided with a conical elastic sealing portion 17, which is made of rubber. The conical elastic sealing portion 17 has a portion extending into the detection hole. When the telescopic member 9 drives the aluminum shell of the battery cell to move closer to the connecting joint, the conical elastic sealing portion 17 seals the detection hole and the pull-through pipe extends into the detection hole.

[0043] Preferably, the aluminum shell of the battery cell has a puncturing station and a detection station on the baffle frame 15. When the aluminum shell of the battery cell is at the puncturing station, the telescopic frame drives the placement frame 14 to approach the puncture needle 8, and the puncture needle 8 punctures the aluminum shell of the battery cell; when the aluminum shell of the battery cell is in the detection station, when the telescopic member 9 drives the placement frame 14 to move close to the connecting joint, the connecting joint extends to the detection hole and the conical elastic sealing portion 17 seals the detection hole; then the telescopic member 9 stops the action, that is, the cover body 11 is covered to make the box body 10 airtight, and then gas is blown into the aluminum shell of the battery cell through the air inlet pipe 6, the connecting pipe 4, the air outlet pipe 3 and the connecting joint to complete the blasting.

[0044] In the present invention, the simple blasting device proposed for the voltage withstand test of the aluminum shell of the battery cell simplifies the functions of the existing complex blasting device, retains only the core functions and achieves lightweight structure design, which greatly reduces the purchase cost of the device and improves the convenience of the equipment. It can effectively improve the chaotic and dangerous status of blasting tests in the industry with extremely low cost investment.

[0045] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A simple blasting device for voltage withstand test of aluminum shell of battery core, characterized in that: The detection box (1) comprises a box body (10) and a cover body (11) installed on the box body (10), wherein the cover body (11) and the box body (10) form a sealed cavity; An air circuit box (2) is provided on one side of the box body (10), an air outlet pipe (3) is installed in the air circuit box (2), one end of the air outlet pipe (3) extends to the sealed cavity, and the gas discharged from the air outlet pipe (3) is blown into the detection hole of the aluminum shell of the battery core; A connecting pipe (4) is provided in the air circuit box (2), the connecting pipe (4) is in communication with the air outlet pipe (3), and a flow valve (5) is provided on the connecting pipe (4).

2. The simple blasting device for the withstand voltage test of the aluminum shell of the battery cell according to claim 1 is characterized in that: The connecting pipe (4) is connected to an air inlet pipe (6), and external gas is pumped to the air inlet pipe (6), the connecting pipe (4) and the air outlet pipe (3) by an air pump, and the gas in the air outlet pipe (3) is blown into the aluminum shell of the battery core.

3. The simple blasting device for the withstand voltage test of the aluminum shell of the battery cell according to claim 1 is characterized in that: The connecting pipe (4) is provided with a total pressure gauge (7).

4. The simple blasting device for voltage withstand test of aluminum shell of battery cell according to claim 1, characterized in that: A puncture needle (8) is provided on one side wall of the box body (10), and a telescopic member (9) is provided inside the box body (10). The telescopic member (9) is used to drive the aluminum shell of the battery core to move toward the puncture needle (8) to puncture the aluminum shell of the battery core.

5. The simple blasting device for voltage withstand test of aluminum shell of battery cell according to claim 4, characterized in that: An elastic protective member (12) is also provided on the inner wall of the box body (10), and the elastic protective member (12) is sleeved on the outer side of the puncture needle (8).

6. The simple blasting device for the withstand voltage test of the aluminum shell of the battery cell according to claim 5 is characterized in that: The elastic protective member (12) has an elastic sealing sheet (13) on the side away from the box body (10), and the elastic sealing sheet (13), the elastic protective member (12) and the inner wall of the box body (10) form a protective cavity, and the puncture needle (8) is located in the protective cavity. When the aluminum shell of the battery cell moves toward the puncture needle (8), the puncture needle (8) first penetrates the elastic sealing sheet (13) and then punctures the side wall of the aluminum shell of the battery cell.

7. The simple blasting device for the withstand voltage test of the aluminum shell of the battery cell according to claim 6 is characterized in that: A placement frame (14) is installed in the box body (10); the placement frame (14) is installed in the box body (10) in a transversely sliding manner; the telescopic end of the telescopic frame is connected to the placement frame (14); and the battery cell is placed in the placement frame (14).

8. The simple blasting device for the withstand voltage test of the aluminum shell of the battery cell according to claim 7 is characterized in that: A blocking frame (15) is detachably mounted on the placement frame (14), and the blocking frame (15) brings the aluminum shell of the battery cell close to the puncture needle (8). When the aluminum shell of the battery cell moves toward the puncture needle (8), the blocking frame (15) contacts the elastic sealing sheet (13) and presses the elastic sealing sheet (13) to move toward the puncture needle (8), so that the puncture needle (8) penetrates the elastic sealing sheet (13), and then the puncture needle (8) punctures the aluminum shell of the battery cell to form a detection hole.

9. The simple blasting device for voltage withstand test of aluminum shell of battery cell according to claim 1, characterized in that: The inner wall of the box body (10) is provided with a connecting joint, one end of which is in communication with the air outlet pipe (3), and the other end of which extends into the detection hole of the aluminum shell of the battery core and seals the detection hole.

10. The simple blasting device for voltage withstand test of aluminum shell of battery cell according to claim 9, characterized in that: The connecting joint comprises a connecting pipe (16), the connecting pipe (16) being connected to the air outlet pipe (3), the connecting pipe (16) being provided with a conical elastic sealing portion (17) on the outside, and the conical elastic sealing portion (17) having a portion extending into the detection hole.

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