Puncture test device

Abstract

The utility model belongs to the technical field of cell acupuncture tests, and discloses an acupuncture test device. The needling test device comprises a box body, a driving part and a needling needle, the outer wall of at least one side of the box body is transparent, the box body is used for containing constant-temperature oil liquid, a preset heating temperature is set in the box body to heat the oil liquid, the bottom of the box body is used for fixing a module, and the module comprises a plurality of battery cells; the driving piece is arranged below the box body; the pricking needle extends along the Z axis, the output end of the driving part is fixedly connected with the pricking needle, and the driving part is used for driving the pricking needle to move upwards along the Z axis, so that the pricking needle pierces into the battery cell at a constant speed. According to the acupuncture test device, the outer wall of at least one side of the box body is set to be transparent, so that the thermal failure process of the battery cell can be observed through the transparent box body when the acupuncture needle pierces a certain battery cell to cause thermal runaway of the battery cell, and when the test object is a module, the process of spreading from the failure battery cell to other battery cells in the module can also be observed; research and development personnel can conveniently carry out refined analysis on the failure.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core puncture test, in particular to a puncture test device. Background Art

[0002] In battery cell puncture tests, most of the time only individual battery cells are tested. However, in actual use, multiple battery cells are often used at the same time. Therefore, conducting a puncture test after multiple battery cells are formed into a module is closer to actual use. When puncturing one of the battery cells in the module, the box containing the bath oil is mostly made of metal, and the process of battery cell runaway and the process of heat spreading to surrounding battery cells cannot be observed, which is not conducive to R&D personnel to analyze abnormal problems and set corresponding avoidance measures for thermal runaway of the battery cells.

[0003] Therefore, it is urgent to design a needle puncture test device to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a needle penetration test device, which can visually observe the failure process of the battery cell and the heat spread process, and help R&D personnel to conduct detailed analysis of the failure.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Acupuncture test device, including:

[0007] A box body, at least one side of which has a transparent outer wall, is used to contain constant temperature oil, a preset heating temperature is set inside the box body to heat the oil, and the bottom of the box body is used to fix the module, and the module includes multiple battery cells;

[0008] A driving member is arranged below the box body;

[0009] The needle extends along the Z direction. The output end of the driving member is fixedly connected to the needle. The driving member is used to drive the needle to move upward along the Z direction so that the needle can penetrate into the battery cell at a uniform speed.

[0010] As an optional solution, the box body is a transparent glass cover.

[0011] As an optional solution, a plurality of visible baffles are provided inside the box and around the module.

[0012] As an optional option, it also includes:

[0013] A tool fixing plate, connected to the bottom plate of the box body in an adjustable manner;

[0014] The fixing tool is installed on the fixing plate. The fixing tool can limit the module in the horizontal direction and the Z direction. The needle can pass through the fixing plate and the fixing tool.

[0015] As an optional solution, the above-mentioned fixed tooling includes:

[0016] A limiting bottom plate is provided with limiting grooves adapted to the shapes of the plurality of battery cells;

[0017] Connectors and cover plates, the cover plates are arranged on the tops of the plurality of battery cells, and the cover plates and the limiting bottom plates are connected via at least three connectors.

[0018] As an optional solution, a high-speed camera is also included, and the high-speed camera is used to capture the thermal runaway of the module after acupuncture.

[0019] As an optional solution, it further includes a connecting plate, the connecting plate is located above the driving member, and the box is installed on the connecting plate;

[0020] The sealing member is provided on the connecting plate and the bottom plate of the box body at positions corresponding to the needles. The sealing member is configured to allow the needles to pass through but not the constant temperature oil.

[0021] As an optional solution, the sealing component is a nitrile rubber component.

[0022] As an optional solution, the acupuncture test device further includes:

[0023] The oil draining member is installed on the above-mentioned box body, and is used for discharging the above-mentioned constant temperature oil in the above-mentioned box body.

[0024] As an optional solution, the acupuncture test device further includes:

[0025] A protective box, in which the driving member is installed, and the protective box is located below the box body;

[0026] An installation shaft, one end of the installation shaft is located in the protection box and connected to the output end of the driving member, and the other end of the installation shaft passes through the protection box and is fixedly connected to the needle.

[0027] The beneficial effects of the present invention are:

[0028] The utility model provides a needle penetration test device, which sets at least one side outer wall of a box body to be transparent, and a driving member drives a needle to move upward along the Z direction, so that the needle can pass through the bottom end of the box body and penetrate into the battery cell at a uniform speed. When the needle penetrates a certain battery cell and causes thermal runaway of the battery cell, the thermal failure process of the battery cell can be observed through the transparent box body. When the test object is a module, the process of the failure spreading from the failed battery cell to other battery cells in the module can also be observed, which helps R&D personnel to conduct detailed analysis of the failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of an acupuncture test device provided by an embodiment of the present utility model;

[0030] Figure 2 This is a schematic structural diagram of a portion of the acupuncture test device provided by an embodiment of the present utility model;

[0031] Figure 3 It is a top view of a portion of the acupuncture test device provided by an embodiment of the present utility model;

[0032] Figure 4 This is a cross-sectional view of a portion of the acupuncture test device provided by an embodiment of the present invention at the position of the needle;

[0033] Figure 5 This Figure 4 Enlarged view at point A.

[0034] In the picture:

[0035] 1. Box body; 11. Bottom plate; 12. Cover body;

[0036] 2. Driving part; 3. Mounting shaft; 4. Needle; 5. Pillar; 6. Protective box; 7. Seal; 9. Connecting plate; 91. Avoidance groove; 10. Fixing tool; 101. Limiting bottom plate; 102. Cover plate; 103. Connecting part; 13. Tool fixing plate; 131. Slide groove; 14. Oil drain part; 15. Visible baffle; 16. First buckle plate; 17. Second buckle plate; 18. Adjusting bolt. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] This embodiment provides a needle penetration test device that can visually observe the process of battery cell failure and heat spread, which helps R&D personnel to conduct detailed analysis of failure. Figure 1 As shown, the puncture test device includes a box 1, a driving member 2 and a needle 4. At least one side of the outer wall of the box 1 is transparent. The box 1 is used to contain constant temperature oil. A preset heating temperature is set in the box 1 to heat the oil. The bottom of the box 1 is used to fix the module, which includes multiple battery cells; the driving member 2 is arranged below the box 1; the needle 4 extends along the Z direction, and the output end of the driving member 2 is fixedly connected to the needle 4. The driving member 2 is used to drive the needle 4 to move upward along the Z direction so that the needle 4 can penetrate the battery cell at a uniform speed.

[0042] The above-mentioned puncture test device sets at least one side of the outer wall of the box body 1 to be transparent, and the driving member 2 drives the needle 4 to move upward along the Z direction, so that the needle 4 can pass through the bottom end of the box body 1 and penetrate into the battery cell at a uniform speed. When the needle 4 penetrates a certain battery cell and causes thermal runaway of the battery cell, the thermal failure process of the battery cell can be observed through the transparent box body 1. When the test object is a module, the process of spreading from the failed battery cell to other battery cells in the module can also be observed, which helps R&D personnel to conduct detailed analysis of the failure.

[0043] Alternatively, as Figure 1 As shown, the box body 1 includes a bottom plate 11 and a cover body 12. The cover body 12 is buckled on the bottom plate 11. At least part of the cover body 12 is transparent. In order to ensure the sealing of the box body 1, a sealant is applied between the cover body 12 and the bottom plate 11.

[0044] Optionally, the box body 1 is a transparent glass cover. It is easy to obtain and has low cost. Figure 1 As shown, the cover 12 is composed of a frame and a glass plate ( Figure 1 Only the frame is shown, and the frame is not numbered). The glass plate is installed on the frame. The glass cover has four side surfaces and a top surface. In this embodiment, the four side surfaces and the top surface are all provided with glass plates. In other embodiments, one or more of the surfaces can be selected to be provided with glass plates, which is not limited here.

[0045] In other embodiments, the transparent portion of the box body 1 may also be made of quartz material, which is not limited here.

[0046] When the box body 1 is a transparent glass cover, due to the limited strength of the glass cover, when the battery core fails due to heat, the sparks or slag produced can easily break the glass cover, causing the box body 1 to leak and become unusable.

[0047] In order to solve the above problems, Figure 2 As shown, multiple visible baffles 15 are provided around the module inside the box 1. The arrangement of the visible baffles 15 can effectively prevent slag from splashing toward the glass cover when the battery cell fails, thereby preventing the glass cover from being broken and extending the life of the needle penetration test device.

[0048] Alternatively, as Figure 2 As shown, the puncture test device also includes a fixed tool 10, and the module is fixed in the fixed tool 10. The fixed tool 10 can limit the module in the horizontal direction and the Z direction. The needle 4 can pass through the tool fixing plate 13 and the fixed tool 10. Through the above arrangement, the positioning of multiple battery cells in the box 1 can be achieved.

[0049] Specifically, if Figure 2As shown, the fixture 10 includes a limiting base plate 101, connectors 103, and a cover plate 102. The limiting base plate 101 defines limiting grooves adapted to the shapes of the multiple battery cells. The cover plate 102 is placed on top of the multiple battery cells and is connected to the limiting base plate 101 via at least three connectors 103. The limiting grooves enable the movement of the battery cells in the XY plane, while the cover plate 102 restricts the movement of the battery cells in the Z direction.

[0050] In this embodiment, the cover plate 102 and the limiting base plate 101 are both square, and four visual baffles 15 are provided. A visual baffle 15 is connected to each side of the fixed tool 10, and the two ends of each visual baffle 15 are respectively connected to the cover plate 102 and the limiting base plate 101. This arrangement ensures that the area of ​​the visual baffle 15 does not need to be made very large, saving materials.

[0051] In other embodiments, the visible baffle 15 may also be installed on the bottom plate 11 of the box body 1, which is not limited here.

[0052] Optionally, the needle penetration test device further includes a fixture fixing plate 13 connected to the bottom plate 11 of the housing 1; the fixing fixture 10 is mounted on the fixture fixing plate 13. To achieve adjustable position of the fixing fixture 10 relative to the bottom plate 11 of the housing 1, thereby enabling the needle 4 to penetrate battery cells at different positions, in this embodiment, the fixture fixing plate 13 is adjustably connected to the bottom plate 11 of the housing 1, and / or the fixing fixture 10 is adjustably connected to the fixture fixing plate 13.

[0053] Specifically, Figure 3 For example, the fixture fixing plate 13 is provided with a slide groove 131 along the X direction, and the adjusting bolt 18 passes through the slide groove 131 and is threadedly connected to the bottom plate 11 of the box body 1. When the adjusting bolt 18 is loosened, the fixture fixing plate 13 can be adjusted along the X direction. When the adjusting bolt 18 is tightened, the head of the adjusting bolt 18 abuts against the fixture fixing plate 13, thereby locking the position of the fixture fixing plate 13. Similarly, the fixing fixture 10 and the fixture fixing plate 13 can also be adjusted in the Y direction in this way, which will not be described in detail here. Of course, in another embodiment, the fixture fixing plate 13 adjusts the position in the Y direction, and the fixing fixture 10 adjusts the position in the X direction to achieve the above effect, which is not limited here.

[0054] Optionally, the needle puncture test apparatus further includes a high-speed camera (not shown) for capturing thermal runaway of the module after needle puncture. This arrangement allows for slow playback of the thermal runaway or heat spread process, facilitating analysis of the cause of the runaway.

[0055] Alternatively, as Figure 4 and Figure 5As shown, the puncture test device also includes a connecting plate 9 and a sealing member 7. The connecting plate 9 is located above the driving member 2, and the box body 1 is installed on the connecting plate 9. The connecting plate 9 and the bottom plate 11 of the box body 1 are both provided with sealing members 7 at positions corresponding to the puncture needles 4. The sealing member 7 is configured to allow the puncture needles 4 to pass through but the constant temperature oil does not pass through.

[0056] By respectively providing sealing members 7 on the connecting plate 9 and the bottom plate 11 of the box body 1, that is, providing sealing members 7 at the insertion position and the exit position of the pricking needle 4, the constant temperature oil in the box body 1 will not overflow downward from the insertion position of the pricking needle 4, thereby ensuring the sealing effect of the constant temperature oil in the box body 1; and, there is no need to provide the entire driving member 2 and the pricking needle 4 in the box body 1, that is, there is no need to change the structure of the box body 1 itself, so that the volume of the box body 1 does not need to be very large, reducing the difficulty of producing the box body 1, and does not occupy a large test area, so that the entire acupuncture test device is more compact.

[0057] In this embodiment, the sealing member 7 is a nitrile rubber member, which has the characteristics of excellent oil resistance, high wear resistance, good heat resistance and strong adhesion, thereby better ensuring that the constant temperature oil in the box body 1 will not overflow downward from the insertion position of the needle 4.

[0058] Alternatively, as Figure 5 As shown, a first buckle plate 16 is connected to the lower side of the connecting plate 9, and a seal 7 is clamped between the first buckle plate 16 and the connecting plate 9; a second buckle plate 17 is connected to the lower side of the bottom plate 11, and a seal 7 is clamped between the second buckle plate 17 and the connecting plate 9. Through the above arrangement, the installation of two seals 7 is realized, and the clamping method enables the seal 7 to have a certain amount of deformation, ensuring sufficient deformation and better sealing effect.

[0059] Optionally, the connecting plate 9 and the first buckle plate 16 can be connected by bolts, and the base plate 11 and the second buckle plate 17 can be connected by bolts. It should be noted that after the bolts connecting the base plate 11 and the second buckle plate 17 are tightened, they are sunk into the base plate 11 to prevent the bolts from occupying space outside the base plate 11.

[0060] Optionally, an avoidance groove 91 corresponding to the second gusset plate 17 is opened on the upper side of the connecting plate 9, so that the second gusset plate 17 can be made thicker to ensure that the strength of the second gusset plate 17 is sufficient.

[0061] Alternatively, as Figure 1As shown, the needle penetration test device also includes an oil drain 14, which is installed on the housing 1 and is used to drain the constant-temperature oil in the housing 1. After the needle penetration test is completed, the oil drain 14 can be directly opened to drain the constant-temperature oil in the housing 1 through the oil drain 14 to the outside of the housing 1. The oil drain 14 includes a pipe body and a valve body (not shown). When the valve body is opened, the oil is discharged. When the valve body is closed, the oil is retained in the housing 1 for testing.

[0062] The acupuncture test device also includes a protective box 6, a mounting shaft 3 and a support 5; wherein the driving member 2 is installed in the protective box 6, the protective box 6 is located below the box body 1, and the two ends of the support 5 are respectively fixedly connected to the protective box 6 and the connecting plate 9; one end of the mounting shaft 3 is located in the protective box 6 and is connected to the output end of the driving member 2, and the other end of the mounting shaft 3 passes through the protective box 6 and is fixedly connected to the puncture needle 4, so that the mounting shaft 3 can be driven by the driving member 2 to move in the Z direction, thereby driving the puncture needle 4 to move in the Z direction.

[0063] By placing the driver 2 in the protective box 6, the driver 2 can be better protected and prevented from being affected by dust and impurities in the surrounding environment, thereby increasing the service life of the driver 2. In this embodiment, the driver 2 is specifically an electric cylinder with high precision and long service life.

[0064] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A needle puncture test device, characterized in that include: A box (1) having at least one side of its outer wall being transparent, the box (1) being used to contain constant temperature oil, a preset heating temperature being set in the box (1) to heat the oil, and the bottom of the box (1) being used to fix a module, the module comprising a plurality of battery cells; A driving member (2) is arranged below the box (1); The pricking needle (4) extends along the Z direction, the output end of the driving member (2) is fixedly connected to the pricking needle (4), and the driving member (2) is used to drive the pricking needle (4) to move upward along the Z direction so that the pricking needle (4) can penetrate the battery cell at a uniform speed.

2. The needle puncture test device according to claim 1, characterized in that: The box body (1) is a transparent glass cover.

3. The needle puncture test device according to claim 2, characterized in that: Inside the box (1), a plurality of visible baffles (15) are provided around the module.

4. The needle puncture test device according to claim 1, characterized in that: Also includes: A tool fixing plate (13) is connected to the bottom plate (11) of the box body (1) in an adjustable manner; A fixed tool (10) is installed on the tool fixing plate (13); the fixed tool (10) can limit the module in the horizontal direction and the Z direction; the needle (4) can pass through the tool fixing plate (13) and the fixed tool (10).

5. The needle puncture test device according to claim 4, characterized in that: The fixing tool (10) comprises: A limiting bottom plate (101) is provided with limiting grooves adapted to the shapes of the plurality of battery cells; A connector (103) and a cover plate (102), wherein the cover plate (102) is provided on top of the plurality of battery cells, and the cover plate (102) and the limiting bottom plate (101) are connected via at least three connectors (103).

6. The acupuncture test device according to any one of claims 1 to 5, characterized in that: It also includes a high-speed camera, which is used to shoot the thermal runaway of the module after acupuncture.

7. The acupuncture test device according to any one of claims 1 to 5, characterized in that: It also includes a connecting plate (9), the connecting plate (9) is located above the driving member (2), and the box (1) is mounted on the connecting plate (9); A sealing member (7) is provided on the connecting plate (9) and the bottom plate (11) of the box body (1) at positions corresponding to the puncture needle (4). The sealing member (7) is configured to allow the puncture needle (4) to pass through while the constant temperature oil does not pass through.

8. The needle puncture test device according to claim 7, characterized in that: The sealing member (7) is a nitrile rubber member.

9. The needle puncture test device according to any one of claims 1 to 3, characterized in that: The acupuncture test device further comprises: An oil draining member is installed on the box body (1), and is used to drain the constant temperature oil in the box body (1).

10. The needle puncture test device according to any one of claims 1 to 3, characterized in that: The acupuncture test device further comprises: A protection box (6), wherein the driving member (2) is installed in the protection box (6), and the protection box (6) is located below the box body (1); An installation shaft (3), one end of the installation shaft (3) is located in the protection box (6) and is connected to the output end of the driving member (2), and the other end of the installation shaft (3) passes through the protection box (6) and is fixedly connected to the needle (4).

Images