Battery compression testing apparatus

Abstract

The utility model relates to energy storage equipment detection technical field especially relates to a kind of battery pressure test equipment, including rack, pressure unit and detection unit. Wherein, pressure unit is set in rack, and pressure unit includes stage and pressure piece, stage is used to place the measured piece, and pressure piece can be moved towards measured piece, and with preset pressure pressure measured piece. Detection unit includes displacement sensor, and displacement sensor is set on pressure piece, and displacement sensor is used to detect the depth of measured piece subsidence after pressure piece pressure measured piece. The battery pressure test equipment is set on pressure piece by displacement sensor, the distance of pressure piece movement can be obtained, subtract the distance between pressure piece and measured piece, and the depth of measured piece pressure deformation can be calculated.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment testing technology, and in particular to a battery pressure testing device. Background Technology

[0002] Lithium-ion batteries are a key component of electric vehicles. During assembly and transportation, lithium-ion batteries are susceptible to damage from accidental stepping or pressure from stacked objects. Therefore, batteries need to have a certain degree of resistance to being stepped on. During battery manufacturing, pressure testing is required to assess the battery's deformation under pressure. However, existing battery pressure testing equipment cannot detect the depth of deformation after pressure application. Utility Model Content

[0003] The purpose of this invention is to provide a battery pressure testing device that can detect the deformation depth of a battery after it has been subjected to pressure.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A battery pressure testing device is provided, comprising:

[0006] frame;

[0007] A pressing unit is disposed within the frame. The pressing unit includes a platform and a pressing member. The platform is used to place the test piece, and the pressing member can move toward the test piece and press against the test piece with a preset pressure.

[0008] The detection unit includes a displacement sensor, which is disposed on the pressing member and is used to detect the depth of the test member's depression after the pressing member presses against the test member.

[0009] Optionally, it also includes a cooling box and a lifting unit. The cooling box is disposed inside the frame and contains cooling fire extinguishing materials. The output end of the lifting unit is used to connect to the platform and drive the platform to move into the cooling box.

[0010] Optionally, the lifting unit includes a first driving component, a guide column, a support platform, and a transmission assembly. The first driving component is mounted on the frame. The guide column is connected to the output end of the first driving component through the transmission assembly. The guide column passes through the frame and is threadedly connected to the frame. The support platform is mounted inside the frame and is threadedly connected to the guide column. The platform is mounted on the support platform.

[0011] Optionally, the transmission assembly includes a first transmission rod and a bevel gear set, the bevel gear set including a first bevel gear and a second bevel gear, one end of the first transmission rod is connected to the output end of the first drive member, and the other end is connected to the first bevel gear, the guide post is threadedly connected to the second bevel gear, and the first bevel gear meshes with the second bevel gear.

[0012] Optionally, multiple guide posts are provided, and the multiple guide posts are connected to each other through the first transmission rod and the bevel gear set.

[0013] Optionally, the pressing unit further includes a second driving member, which is disposed on the support platform. The pressing member is connected to the output end of the second driving member, and the second driving member can drive the pressing member to move closer to or away from the test object.

[0014] Optionally, the pressing unit further includes multiple tooling plates, which are detachably connected to the platform. The multiple tooling plates enclose an accommodating space, and the test piece is confined within the accommodating space.

[0015] Optionally, the detection unit further includes a pressure sensor, the detection end of which is disposed on the pressing member, and the pressure sensor is used to detect the pressure of the pressing member pressing against the test piece.

[0016] Optionally, the detection unit further includes a detection component for detecting the voltage and / or temperature of the device under test.

[0017] Optionally, the rack includes a safety door, and a safety light curtain is also provided on the rack for detecting whether the safety door is open.

[0018] The beneficial effects of this utility model are:

[0019] This invention provides a battery pressure testing device, including a frame, a pressure-bearing unit, and a detection unit. The pressure-bearing unit is housed within the frame and includes a platform and a pressure-bearing component. The platform holds the test piece, and the pressure-bearing component is movable towards the test piece, applying a preset pressure to it. The detection unit includes a displacement sensor mounted on the pressure-bearing component. The displacement sensor detects the depth of indentation of the test piece after the pressure-bearing component presses against it. By using a displacement sensor on the pressure-bearing component, the device can obtain the distance the pressure-bearing component moves. Subtracting this distance from the distance between the pressure-bearing component and the test piece allows for the calculation of the depth of deformation under pressure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the battery pressure testing equipment provided in this embodiment of the utility model;

[0021] Figure 2 This is a partial structural schematic diagram of the battery pressure testing equipment provided in this embodiment of the utility model;

[0022] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0023] In the picture:

[0024] 1. Rack; 11. Safety door; 12. Safety light curtain; 13. Protective net;

[0025] 2. Pressing unit; 21. Platform; 22. Pressing component; 221. Guide rod; 222. Press head; 23. Second driving component; 24. Tooling plate;

[0026] 3. Cooling box;

[0027] 4. Lifting unit; 41. First driving component; 42. Guide column; 43. First transmission rod; 44. Support platform. Detailed Implementation

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Lithium-ion batteries are a key component of electric vehicles. During assembly and transportation, lithium-ion batteries are susceptible to damage from accidental stepping or pressure from stacked objects. Therefore, batteries need to have a certain degree of resistance to being stepped on. During battery manufacturing, pressure testing is required to assess the battery's deformation under pressure. However, existing battery pressure testing equipment cannot detect the depth of deformation after pressure application.

[0032] Therefore, this embodiment provides a battery pressure testing device to solve the above problems. The battery pressure testing device can detect the deformation depth of the battery after it is subjected to pressure.

[0033] like Figures 1-3 As shown, the battery pressure testing equipment of this embodiment includes a frame 1, a pressure-bearing unit 2, and a detection unit. The pressure-bearing unit 2 is disposed within the frame 1 and includes a platform 21 and a pressure member 22. The platform 21 is used to place the test piece, and the pressure member 22 can move towards the test piece and press against it with a preset pressure. The detection unit includes a displacement sensor (not shown in the figure), which is disposed on the pressure member 22. The displacement sensor is used to detect the depth of the test piece's depression after the pressure member 22 presses against it. By setting a displacement sensor on the pressure member 22, the battery pressure testing equipment can obtain the distance the pressure member 22 moves. Subtracting the distance between the pressure member 22 and the test piece, the depth of the test piece's deformation under pressure can be calculated.

[0034] Optionally, the frame 1 includes a safety door 11, and a safety light curtain 12 is also provided on the frame 1. The safety light curtain 12 is used to detect whether the safety door 11 is open. During the pressure test, once the safety light curtain 12 detects that the safety door 11 is open, it is considered that the pressure test process may cause harm to the operator, and the equipment will automatically stop the pressure test to ensure the safety of the operator.

[0035] Optionally, the side of the frame 1 is provided with a protective net 13, which has an explosion-proof function. On the one hand, the operator can see the process of the internal pressure test, and on the other hand, the protective net 13 can effectively block the flying debris and protect the safety of the operator.

[0036] Optionally, in this embodiment, protective nets 13 are provided on all four sides of the frame 1, and a safety door 11 is located on one side of the frame 1, and a protective net 13 is also provided on the safety door 11.

[0037] To address the possibility of thermal runaway of the test component during testing, such as Figure 2As shown, optionally, the battery pressure testing equipment also includes a cooling chamber 3, which is disposed within the frame 1. The cooling chamber 3 contains a cooling and extinguishing substance, and the platform 21 can be moved into the cooling chamber 3 so that the test piece is located in the cooling and extinguishing substance. Optionally, in this embodiment, the cooling and extinguishing substance is water. Optionally, the cooling chamber 3 has an inlet pipe and an outlet pipe to facilitate water inlet and outlet.

[0038] Optionally, the battery pressure testing equipment further includes a lifting unit 4, which includes a first drive component 41. The first drive component 41 is mounted on the frame 1, and the platform 21 is drivenly connected to the output end of the first drive component 41. The first drive component 41 can drive the platform 21 into or out of the cooling box 3. Optionally, the first drive component 41 is a motor.

[0039] Optionally, in this embodiment, the cooling box 3 is located below the stage 21, and the stage 21 can be lowered to immerse the test piece in water. Optionally, the first driving member 41 is disposed on the top surface of the frame 1 to prevent damage to the first driving member 41 in the event of thermal runaway of the test piece.

[0040] Optionally, the lifting unit 4 further includes a guide column 42 and a transmission assembly. The guide column 42 is connected to the output end of the first drive member 41 through the transmission assembly. The platform 21 is connected to the guide column 42. The first drive member 41 can drive the guide column 42 to move along its own axis through the transmission assembly to drive the platform 21 into or out of the cooling box 3. The guide column 42 can ensure the stability of the direction of movement of the platform 21. The guide column 42 passes through the frame 1 and is threadedly connected to the frame 1 to ensure that the axial position of the guide column 42 relative to the through hole on the top surface of the frame 1 remains unchanged, and to ensure that the guide column 42 always moves along its own axis.

[0041] Optionally, the transmission assembly includes a first transmission rod 43 and a bevel gear set. The bevel gear set includes a first bevel gear and a second bevel gear. One end of the first transmission rod 43 is connected to the output end of the first driving member 41, and the other end is connected to the first bevel gear. The guide post 42 is threadedly connected to the second bevel gear, and the first bevel gear meshes with the second bevel gear. The first transmission rod 43 is connected to the output end of the first driving member 41, and the first driving member 41 can drive the first transmission rod 43 to rotate. The bevel gear set includes a first bevel gear and a second bevel gear. The first bevel gear is sleeved on the first transmission rod 43, and the second bevel gear is sleeved on the guide post 42. The outer wall of the guide post 42 has external threads, and the second bevel gear has internal threads, and the two are threaded together. Since the first transmission rod 43 is horizontally arranged and the guide post 42 is vertically arranged, the bevel gear set can realize the transmission between the two. Specifically, the first driving member 41 drives the first transmission rod 43 to rotate, the first bevel gear on the first transmission rod 43 rotates coaxially, the first bevel gear meshes with the second bevel gear on the guide post 42, the second bevel gear on the guide post 42 rotates, and the guide post 42 moves along its own axis due to the threaded engagement with the second bevel gear, thereby realizing the movement of the platform 21 in the vertical direction.

[0042] Optionally, to ensure the stability of the platform 21's movement, multiple guide pillars 42 are provided, and the multiple guide pillars 42 are connected by a first transmission rod 43 and a bevel gear set. Optionally, in this embodiment, the first driving member 41 simultaneously drives two first transmission rods 43, and the two first transmission rods 43 respectively drive two guide pillars 42 to move. These two guide pillars 42, in turn, drive two more guide pillars 42 to move through the bevel gear set and the first transmission rod 43, thereby achieving synchronous movement of the four guide pillars 42. The transmission between the guide pillars 42 and the first transmission rods 43 is also achieved through a bevel gear set, which will not be elaborated here. Optionally, the first transmission rods 43 are also horizontally arranged and perpendicular to the extension direction of the first transmission rod 43 connected to the first driving member 41. Optionally, in this embodiment, a total of four guide pillars 42 are provided, and the first driving member 41 has output ends on both sides. One output end drives the first transmission rod 43 to rotate. This first transmission rod 43 meshes with a first bevel gear and a second bevel gear, thereby driving the first guide post 42, which also has a second bevel gear, to rotate. Each end of the second transmission rod 43 has a first bevel gear. The second bevel gear on the first guide post 42 also meshes with a first bevel gear at one end of the second transmission rod 43, driving the second transmission rod 43 to rotate. The second transmission rod 43 then meshes with a second bevel gear on the second guide post 42 through a first bevel gear at its other end, driving the second guide post 42 to rotate. The other side of the first driving member 41 is mirror-symmetrical to the above arrangement, thus driving the other two guide posts 42 to rotate synchronously.

[0043] Optionally, the lifting unit 4 also includes a support platform 44, to which the guide columns 42 and the platform 21 are connected. Optionally, the support platform 44 is disposed within the frame 1 and located above the platform 21, and is threadedly connected to the guide columns 42. Optionally, the bottom of the guide columns 42 is connected to the support platform 44. The platform 21 is disposed on the support platform 44, and optionally, the support platform 44 is connected to the platform 21 below via a vertically extending connecting rod. Since the platform 21 needs to be submerged in the cooling tank 3, its size cannot be too large. The support platform 44 is larger than the platform 21, allowing the four guide columns 42 to be more dispersed, which helps ensure the stability of the lifting process.

[0044] To control the movement of the pressing member 22, the pressing unit 2 may optionally include a second driving member 23. The second driving member 23 is mounted on the support platform 44, and the pressing member 22 is connected to the output end of the second driving member 23. The second driving member 23 can drive the pressing member 22 closer to or further away from the test piece. Optionally, the second driving member 23 is a cylinder or a linear motor. Optionally, the second driving member 23 is located above the support platform 44. The support platform 44 separates the second driving member 23 from the platform 21, which can, to some extent, prevent thermal runaway of the test piece on the platform 21 from damaging the second driving member 23.

[0045] Optionally, the pressing member 22 includes a guide rod 221 and a pressing head 222. One end of the guide rod 221 is connected to the output end of the second driving member 23, and the other end is connected to the pressing head 222. The guide rod 221 passes through a through hole in the support platform 44. Optionally, a sliding bearing is provided between the guide rod 221 and the through hole to ensure the stability of the movement of the guide rod 221.

[0046] Optionally, the guide rod 221 and the pressure head 222 are detachably connected. One device can be configured with a variety of pressure heads 222 of different shapes and specifications to simulate different battery stepping and pressure scenarios. Appropriate pressure heads 222 can be assembled as needed.

[0047] Optionally, in this embodiment, two sets of the second driving member 23 and the pressing member 22 are provided, which can also simulate the situation where the battery has two pressing positions at the same time. Of course, in other embodiments, one, three or more sets of the second driving member 23 and the pressing member 22 may also be provided.

[0048] like Figure 3As shown, optionally, the pressing unit 2 also includes multiple tooling plates 24, which are detachably connected to the stage 21. The tooling plates 24 enclose a receiving space, within which the workpiece to be tested is confined. Optionally, the stage 21 is horizontally positioned, and the tooling plates 24 are vertically positioned. The stage 21 has multiple evenly arranged threaded holes, and the tooling plates 24 can be detachably connected to the stage 21 using bolts. Simultaneously, adjacent tooling plates 24 can also be detachably connected to each other, further improving the stability of the receiving space. The position, size, and shape of this receiving space on the stage 21 are adjustable, maximizing its adaptability to workpieces of different specifications and shapes.

[0049] Optionally, the detection unit also includes a pressure sensor (not shown in the figure). The detection end of the pressure sensor is disposed on the pressing member 22. The pressure sensor is used to detect the pressure of the pressing member 22 pressing against the test piece. It can also calculate the subsequent movement distance of the pressing member 22 from the starting point of the pressure change as the deformation depth of the test piece.

[0050] Optionally, the detection unit also includes a detection component (not shown in the figure), which includes a voltage detection module and a temperature detection module. The voltage detection module connects the acquisition end to the positive and negative terminals of the device under test via a voltage acquisition line to detect the voltage of the device under test. The temperature detection module places the acquisition end on the surface of the device under test via a temperature acquisition line to detect the temperature of the device under test. This allows observation of the effect of pressure on the battery's voltage and temperature, and understanding of the boundary values ​​of battery pressure.

[0051] Optionally, the detection unit also includes a control display screen (not shown in the figure). The output terminals of the voltage detection module and the temperature detection module are connected to the control display screen, which can send the detected voltage and temperature signals to the display screen to display the data.

[0052] The following test uses a ternary lithium aluminum-cased battery as the test piece. The test procedure includes the following steps: First, select four aluminum-cased batteries and place them vertically on the stage 21, fixing them with the tooling plate 24. Then, select a suitable pressure head 222 and assemble it onto the guide rod 221, and start the second drive component 23 to apply pressure to the battery.

[0053] One of the pressure heads 222 can perform a pressure test on the battery. Specifically, pressure is applied to the battery through the pressure head 222, with the pressure gradually increasing each time, starting from 1000N and increasing by 100N each time, and each pressure is maintained for 3 seconds, until the battery voltage becomes abnormal, or the temperature becomes abnormal, or the battery catches fire. The applied force, i.e., the maximum pressure the battery can withstand, is recorded, as is the depth of the downward indentation on the battery surface.

[0054] Another pressure head 222 can perform a stomp test on the battery. Specifically, the battery surface is stomped repeatedly with constant pressure to simulate the situation of a person stepping on the battery. The stomp is repeated until the battery malfunctions. The number of stomps and the pressure are recorded to determine the battery's stomp safety.

[0055] This battery pressure testing equipment can simulate scenarios where lithium-ion batteries are subjected to pressure from people stepping on them or from stacked objects. By combining real-time monitoring of the battery's voltage and temperature, the maximum pressure the battery can withstand and the degree of pressure from being stepped on can be determined. Furthermore, the equipment effectively ensures the safety of both the equipment and the testing personnel by incorporating a cooling box 3, a safety light curtain 12, and voltage and temperature detection components.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery compression testing apparatus, characterized by, include: Rack (1); A pressing unit (2) is disposed in the frame (1). The pressing unit (2) includes a platform (21) and a pressing member (22). The platform (21) is used to place the test piece, and the pressing member (22) can move toward the test piece and press the test piece with a preset pressure. The detection unit includes a displacement sensor, which is disposed on the pressing member (22) and is used to detect the depth of the test member sinking after the pressing member (22) presses against the test member.

2. The battery compression test apparatus of claim 1, wherein It also includes a cooling box (3) and a lifting unit (4). The cooling box (3) is located inside the frame (1) and contains cooling and extinguishing materials. The output end of the lifting unit (4) is used to connect to the platform (21) and drive the platform (21) to move into the cooling box (3).

3. The battery compression testing apparatus of claim 2, wherein, The lifting unit (4) includes a first driving member (41), a guide column (42), a support platform (44), and a transmission assembly. The first driving member (41) is mounted on the frame (1). The guide column (42) is connected to the output end of the first driving member (41) through the transmission assembly. The guide column (42) passes through the frame (1) and is threadedly connected to the frame (1). The support platform (44) is mounted inside the frame (1) and is threadedly connected to the guide column (42). The platform (21) is mounted on the support platform (44).

4. The battery compression testing apparatus of claim 3, wherein, The transmission assembly includes a first transmission rod (43) and a bevel gear set. The bevel gear set includes a first bevel gear and a second bevel gear. One end of the first transmission rod (43) is connected to the output end of the first drive member (41), and the other end is connected to the first bevel gear. The guide post (42) is threadedly connected to the second bevel gear, and the first bevel gear meshes with the second bevel gear.

5. The battery compression testing apparatus of claim 4, wherein, Multiple guide posts (42) are provided, and the multiple guide posts (42) are connected to each other through the first transmission rod (43) and the bevel gear set.

6. The battery compression test apparatus of claim 3, wherein, The pressing unit (2) further includes a second driving member (23), which is disposed on the support platform (44). The pressing member (22) is connected to the output end of the second driving member (23). The second driving member (23) can drive the pressing member (22) to move closer to or away from the test piece.

7. The battery compression testing apparatus of any one of claims 1-6, wherein, The pressing unit (2) also includes multiple tooling plates (24), which are detachably connected to the platform (21). The multiple tooling plates (24) enclose a receiving space, and the test piece is limited within the receiving space.

8. The battery compression testing apparatus of any one of claims 1-6, wherein, The detection unit also includes a pressure sensor, the detection end of which is disposed on the pressing member (22), and the pressure sensor is used to detect the pressure of the pressing member (22) pressing against the test piece.

9. The battery compression testing apparatus of any one of claims 1-6, wherein, The detection unit further includes a detection component for detecting the voltage and / or temperature of the device under test.

10. The battery compression testing apparatus of any one of claims 1-6, wherein, The rack (1) comprises a safety door (11), and a safety grating (12) is further arranged on the rack (1), and the safety grating (12) is used for detecting whether the safety door (11) is opened.

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