A battery cell module extrusion testing device and system

Abstract

The utility model relates to a kind of battery module extrusion testing device, through two first fixed rod, two second fixed rod, and rear end plate dismounting type connection lower end plate and upper end plate, first sliding slot and second sliding slot are respectively set up on lower end plate and upper end plate, two first fixed rod are slidably arranged in first sliding slot or second sliding slot.The extrusion testing device of the utility model utilizes the frame formed by lower end plate, upper end plate, fixed rod and rear end plate, and the clamping of different thickness, different length module can be completed in short time, cooperate with slider position adjustment, accurately reproduce various intrusion in vehicle collision.The extrusion testing device of the utility model can be repeatedly used in battery module level, and the collision extrusion verification that traditional only to vehicle stage can be implemented is moved to early part development.

Description

Technical Field

[0001] This utility model relates to equipment for testing the electrical condition of batteries, and more particularly to a cell module extrusion testing device and system. Background Technology

[0002] In recent years, the number of new energy vehicles in my country has increased rapidly. Frequent news reports of battery pack fires and explosions in electric vehicle collisions have made battery safety a focus of attention for consumers and regulatory authorities. Battery packs are heavy and expensive, and their structural resistance to intrusion during a vehicle collision directly determines whether thermal runaway will propagate. Traditional verification methods involve assembling the complete battery pack into the vehicle after all sub-components are assembled, conducting real-vehicle collision or trolley crush tests, and judging safety by observing whether fires or explosions occur.

[0003] However, battery pack development cycles often last for months, and any test failure means re-manufacturing the pack and rescheduling. The cost of a single test can be as high as hundreds of thousands of yuan. If thermal runaway occurs, it can also damage the entire vehicle and testing equipment, posing a huge safety risk. At the same time, whole-pack level tests can only obtain the macroscopic response of the pack and cannot accurately obtain deformation and failure data of individual cells or modules under different intrusion amounts and different preloads, making it difficult to provide a basis for early structural optimization.

[0004] Therefore, the industry urgently needs a low-cost, repeatable, and data-granular extrusion testing solution that can be carried out at the cell or module stage to expose design defects in advance, shorten the development cycle, and reduce verification risks. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art, and therefore adopts the following technical solution: The first aspect of this utility model is to provide a battery cell module extrusion testing device, comprising: a lower end plate, a rear end plate, an upper end plate, and a fixing rod; wherein... The lower end plate has two first sliding grooves on the left and right sides of its front end, and two first sliders are slidably disposed in the two first sliding grooves; the lower end plate has two first fixing holes on the left and right sides of its rear end; and a first slot is formed in the middle of the rear end of the lower end plate. The upper end plate has two second sliding grooves on the left and right sides of its front end, and two second sliders are slidably disposed in the two second sliding grooves; the upper end plate has two second fixing holes on the left and right sides of its rear end; and a second slot is provided in the middle of the rear end of the upper end plate. The fixing rod includes: two first fixing rods and two second fixing rods, the bottom of the two first fixing rods being detachably connected to the two first sliders respectively, and the top of the two first fixing rods being detachably connected to the two second sliders respectively; the bottom of the two second fixing rods being detachably connected to the two first fixing holes respectively, and the top of the two second fixing rods being detachably connected to the two second fixing holes respectively. The bottom end of the rear end plate is detachably connected to the first slot, and the top end of the rear end plate is detachably connected to the second slot.

[0006] Preferably, it further includes: a pressure sensor; wherein, A third detection hole is provided on the upper end plate, and the pressure sensor is disposed in the third detection hole, with the detection end of the pressure sensor located on the lower surface of the upper end plate.

[0007] Preferably, it further includes: a lifting ring; wherein, The upper plate has a fourth mounting hole, and the lifting ring is detachably installed in the fourth mounting hole.

[0008] Preferably, it further includes: a camera; wherein, The upper plate has a fourth mounting hole, and the lifting ring is detachably installed in the fourth mounting hole.

[0009] Preferably, the bottom outer wall of the first fixing rod is provided with a first external thread, the first slider is provided with a first threaded hole, and the bottom of the first fixing rod and the first slider are detachably connected by thread engagement.

[0010] Preferably, the top outer wall of the first fixing rod is provided with a second external thread, and the second slider is provided with a second threaded hole. The top of the first fixing rod and the second slider are connected in a detachable manner through threaded engagement.

[0011] Preferably, the bottom outer side wall of the second fixing rod is provided with a third external thread, the inner side wall of the first fixing hole is provided with a first internal thread, and the bottom of the second fixing rod and the first fixing hole are detachably connected by thread engagement.

[0012] Preferably, a third external thread is provided on the bottom outer wall of the second fixing rod, a first fixing nut is embedded in the first fixing hole, the first fixing nut has a third threaded hole, and the bottom of the second fixing rod is connected to the first fixing nut by thread engagement for detachable connection.

[0013] Preferably, a fourth external thread is provided on the top outer wall of the second fixing rod, and a second internal thread is provided on the inner wall of the second fixing hole. The top of the second fixing rod and the second fixing hole are connected in a detachable manner through threaded engagement.

[0014] Preferably, a fourth external thread is provided on the top outer wall of the second fixing rod, a second fixing nut is embedded in the second fixing hole, the second fixing nut has a fourth threaded hole, and the bottom of the second fixing rod is connected to the second fixing nut by thread engagement for detachable connection.

[0015] Preferably, in the width direction of the lower end plate or the upper end plate, the width of the rear end plate is slightly larger than the width of the first slot or the second slot to form an interference fit.

[0016] A second aspect of this utility model is to provide a battery cell module extrusion testing system, comprising: the battery cell module extrusion testing device as described above, and an extrusion column; wherein... Several battery cell modules are stacked between the lower end plate and the upper end plate; The extrusion column performs an extrusion test on several of the battery cell modules along the length of the lower end plate or the upper end plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are reflected in: The extrusion testing device of this utility model can be used repeatedly at the cell module level, moving the collision extrusion verification that can only be carried out at the vehicle stage to the early stage of component development. The extrusion testing device of this utility model utilizes a frame formed by a lower end plate, an upper end plate, a fixed rod, and a rear end plate to clamp modules of different thicknesses and lengths in a short time. With the adjustment of the slider position, it can accurately reproduce various intrusion amounts in a vehicle collision. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the battery cell module extrusion testing device equipped with lifting rings in this utility model; Figure 2 This is a schematic diagram of the structure of the battery cell module extrusion testing device equipped with lifting rings in this utility model; Figure 3 This is a schematic diagram of the structure of the battery cell module extrusion testing device equipped with a camera in this utility model; The reference numerals in the figures include: Battery cell module 01; extrusion column 02; lower end plate 1; first slide groove 11; first slider 111; first fixing hole 12; first fixing nut 121; rear end plate 2; upper end plate 3; second slide groove 31; second slider 311; second fixing nut 321; first fixing rod 41; second fixing rod 42; pressure sensor 5; lifting ring 61; camera 62. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below.

[0020] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0021] The word "comprising" or similar terms used in this utility model patent application specification and claims mean that the objects preceding "comprising" include the objects listed after "comprising" or their equivalents, and do not exclude other objects.

[0022] Example 1 like Figure 1 As shown, this embodiment provides a battery cell module extrusion testing device, including: a lower end plate 1, a rear end plate 2, an upper end plate 3, a fixing rod, and a pressure sensor 5; wherein, The lower end plate 1 has a front end and a rear end that are oppositely arranged along its length direction, a left side and a right side that are oppositely arranged along its width direction, and an upper surface and a lower surface that are oppositely arranged along its thickness direction. Two first sliding grooves 11 are respectively opened on the left and right sides of the front end of the lower end plate 1, and two first sliders 111 are slidably arranged in the two first sliding grooves 11. Two first fixing holes 12 are respectively opened on the left and right sides of the rear end of the lower end plate 1. A first slot is opened in the middle of the rear end of the lower end plate 1. The upper end plate 3 has a front end and a rear end that are oppositely arranged along its length direction; the upper end plate 3 has a left side and a right side that are oppositely arranged along its width direction; the upper end plate 3 has an upper surface and a lower surface that are oppositely arranged along its thickness direction; two second sliding grooves 31 are respectively opened on the left and right sides of the front end of the upper end plate 3, and two second sliders 311 are slidably arranged in the two second sliding grooves 31; two second fixing holes are respectively opened on the left and right sides of the rear end of the upper end plate 3; a second slot is opened in the middle of the rear end of the upper end plate 3; a third detection hole is opened on the upper end plate 3 (preferably the middle of the upper end plate 3); The fixing rod includes two first fixing rods 41 and two second fixing rods 42. The first fixing rods 41 have oppositely arranged tops and bottoms along their length (axial direction). The bottoms of the two first fixing rods 41 are detachably connected to the two first sliders 111, and the tops of the two first fixing rods 41 are detachably connected to the two second sliders 311. The second fixing rods 42 have oppositely arranged tops and bottoms along their length (axial direction). The bottoms of the two second fixing rods 42 are detachably connected to the two first fixing holes 12, and the tops of the two second fixing rods 42 are detachably connected to the two second fixing holes. The bottom end of the rear end plate 2 is detachably connected to the first slot, and the top end of the rear end plate 2 is detachably connected to the second slot. The pressure sensor 5 is disposed in the third detection hole, and the detection end of the pressure sensor 5 is located on the lower surface of the upper end plate 3. The pressure sensor 5 outputs the module pre-tightening force in real time to ensure that the test conditions are consistent with the actual assembly state of the battery pack. Thus, the failure boundary of the entire pack can be predicted by low-cost, low-energy module-level tests, avoiding the high cost of scrapping the entire pack due to a single failure.

[0023] In some preferred embodiments, a fourth mounting hole is provided on the upper end plate 3 (preferably the middle of the front end of the upper end plate 3). A lifting ring 61 or a camera 62 is detachably installed in the fourth mounting hole. The lifting ring 61 can be installed during transportation, and the camera 62 can be replaced during testing to achieve close-range high-definition recording of the microscopic morphology at the moment of extrusion, providing fine data for subsequent simulation calibration and material improvement.

[0024] In some preferred embodiments, the first fixing rod 41 has a first external thread on its bottom outer side wall and a second external thread on its top outer side wall. The first slider 111 has a first threaded hole. The bottom of the first fixing rod 41 and the first slider 111 are detachably connected by a threaded engagement. The second slider 311 has a second threaded hole. The top of the first fixing rod 41 and the second slider 311 are detachably connected by a threaded engagement. In some preferred embodiments, the first fixing rod 41 is a double-ended screw; the first slider 111 and the second slider 311 are nuts, the thickness of which is lower than the thickness of the first groove 11, to ensure that the nut does not protrude from the lower end plate 1, thereby ensuring that the cell module extrusion testing device and the extrusion workbench are fully in contact, avoiding local stress concentration; at the same time, the width of the nut is slightly lower than the width of the first groove 11 or the second groove 31, so as to limit the rotation of the nut but allow it to slide along the length direction of the first groove 11 or the second groove 31, thereby adapting to the length of different cell modules and preset the extrusion intrusion amount.

[0025] In some preferred embodiments, a third external thread is provided on the bottom outer wall of the second fixing rod 42, a fourth external thread is provided on the top outer wall of the second fixing rod 42, a first internal thread is provided on the inner wall of the first fixing hole 12, the bottom of the second fixing rod 42 is detachably connected to the first fixing hole 12 through threaded engagement, a second internal thread is provided on the inner wall of the second fixing hole, and the top of the second fixing rod 42 is detachably connected to the second fixing hole through threaded engagement. In some preferred embodiments, the second fixing rod 42 is a double-ended screw.

[0026] In some other preferred embodiments, a third external thread is provided on the bottom outer side wall of the second fixing rod 42, and a fourth external thread is provided on the top outer side wall of the second fixing rod 42. A first fixing nut 121 is embedded in the first fixing hole 12. The first fixing nut 121 has a third threaded hole. The bottom of the second fixing rod 42 is connected to the first fixing nut 121 by thread engagement for detachable connection. A second fixing nut 321 is embedded in the second fixing hole. The second fixing nut 321 has a fourth threaded hole. The bottom of the second fixing rod 42 is connected to the second fixing nut 321 by thread engagement for detachable connection. In some other preferred embodiments, the second fixing rod 42 is a double-ended screw, and the thickness of the first fixing nut 121 is lower than the thickness of the first fixing hole 12, so as to ensure that the first fixing nut 121 does not protrude from the lower end plate 1, thereby ensuring that the cell module extrusion test device and the extrusion workbench are fully fitted together and avoiding local stress concentration.

[0027] In some preferred embodiments, in the width direction of the lower end plate 1 or the upper end plate 3, the width of the rear end plate 2 is slightly larger than the width of the first slot or the second slot to form an interference fit.

[0028] In some preferred embodiments, the entire battery cell module extrusion testing device is coated with insulating powder to prevent high-voltage short circuits.

[0029] Example 2 Still Figure 1 As shown in the figure, this embodiment provides a battery cell module extrusion testing system and its usage method.

[0030] In use, first place the first slider 111 (nut) into the first slide groove 11, and insert the first fixing nut 121 into the first fixing hole 12; then, screw the bottom of the two first fixing rods 41 into the first slider 111 and pre-tighten, and screw the bottom of the two second fixing rods 42 into the first fixing nut 121 and pre-tighten; the bottom end of the rear end plate 2 is pressed into the first slot in an interference fit manner. Several battery cell modules 01 are stacked sequentially on the upper surface of the lower end plate 1, and the battery cell modules 01 are attached to the front surface of the rear end plate 2. After stacking, the upper plate 3 is passed through the two first fixing rods 41 and the two second fixing rods 42 and placed on the top of the uppermost cell module. The pressure sensor 5 is embedded in the third detection hole, and the detection end of the pressure sensor 5 is located between the lower surface of the upper plate 3 and the upper surface of the uppermost cell module. The top of the two first fixing rods 41 is screwed into the second slider 311 (nut), and the top of the two second fixing rods 42 is screwed into the second fixing nut 321. Rotating the second slider 311 and the second fixing nut 321 causes the upper plate 3 to move downward. The pressure sensor 5 outputs a pre-tightening force in real time. When the force reaches the battery pack assembly force, the second slider 311 and the second fixing nut 321 are locked. At this time, the second slider 311 can be placed in or not placed in the second groove 31, and the second fixing nut 321 can be embedded in or not embedded in the second fixing hole. like Figure 2 As shown, after the lifting ring 61 is assembled in the fourth mounting hole, the entire assembly is lifted to the extrusion table, and then the lifting ring 61 is removed; as Figure 3 As shown, the fourth mounting hole is fitted with a camera 62, which is used to record the microscopic deformation process of the extrusion column 02 intruding into the surface of the battery cell module 01 at close range.

[0031] In summary, the extrusion testing device of this invention can be repeatedly used at the cell module level, moving the collision extrusion verification, which can only be carried out at the vehicle stage in the traditional way, to the early stage of component development.

[0032] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell module extrusion testing device, characterized in that, include: Lower end plate (1), rear end plate (2), upper end plate (3), fixing rod; among which, The lower end plate (1) has two first sliding grooves (11) on the left and right sides of the front end, and two first sliders (111) are slidably arranged in the two first sliding grooves (11); the lower end plate (1) has two first fixing holes (12) on the left and right sides of the rear end; and the lower end plate (1) has a first slot in the middle of the rear end. The upper end plate (3) has two second sliding grooves (31) on the left and right sides of the front end, and two second sliders (311) are slidably arranged in the two second sliding grooves (31); the upper end plate (3) has two second fixing holes on the left and right sides of the rear end; and the upper end plate (3) has a second slot in the middle of the rear end. The fixing rod includes two first fixing rods (41) and two second fixing rods (42). The bottoms of the two first fixing rods (41) are detachably connected to the two first sliders (111) respectively, and the tops of the two first fixing rods (41) are detachably connected to the two second sliders (311) respectively. The bottoms of the two second fixing rods (42) are detachably connected to the two first fixing holes (12) respectively, and the tops of the two second fixing rods (42) are detachably connected to the two second fixing holes respectively. The bottom end of the rear end plate (2) is detachably connected to the first slot, and the top end of the rear end plate (2) is detachably connected to the second slot.

2. The cell module extrusion testing device according to claim 1, characterized in that, Also includes: Pressure sensor (5); where, The upper end plate (3) is provided with a third detection hole, the pressure sensor (5) is disposed in the third detection hole, and the detection end of the pressure sensor (5) is located on the lower surface of the upper end plate (3).

3. The cell module extrusion testing device according to claim 1, characterized in that, Also includes: Rings (61); among which, The upper end plate (3) has a fourth mounting hole, and the lifting ring (61) is detachably installed in the fourth mounting hole.

4. The cell module extrusion testing device according to claim 1, characterized in that, Also includes: Camera (62); among which, The upper end plate (3) has a fourth mounting hole, and the lifting ring (61) is detachably installed in the fourth mounting hole.

5. The cell module extrusion testing device according to claim 1, characterized in that, The first fixing rod (41) has a first external thread on its bottom outer side wall, and the first slider (111) has a first threaded hole. The bottom of the first fixing rod (41) and the first slider (111) are connected in a detachable manner through threaded engagement.

6. The cell module extrusion testing device according to claim 1, characterized in that, The first fixing rod (41) has a second external thread on its top outer side wall, and the second slider (311) has a second threaded hole. The top of the first fixing rod (41) and the second slider (311) are connected in a detachable manner through threaded engagement.

7. The cell module extrusion testing device according to claim 1, characterized in that, The bottom outer wall of the second fixing rod (42) is provided with a third external thread, and the inner wall of the first fixing hole (12) is provided with a first internal thread. The bottom of the second fixing rod (42) and the first fixing hole (12) are connected in a detachable manner through thread engagement.

8. The cell module extrusion testing device according to claim 1, characterized in that, The bottom outer wall of the second fixing rod (42) is provided with a third external thread, and the first fixing hole (12) is inlaid with a first fixing nut (121). The first fixing nut (121) has a third threaded hole, and the bottom of the second fixing rod (42) and the first fixing nut (121) are connected by thread for detachment.

9. The cell module extrusion testing device according to claim 1, characterized in that, The second fixing rod (42) has a fourth external thread on its top outer side wall and a second internal thread on its inner side wall. The top of the second fixing rod (42) and the second fixing hole are connected in a detachable manner by thread engagement.

10. The cell module extrusion testing device according to claim 1, characterized in that, The second fixing rod (42) has a fourth external thread on its top outer side wall, and a second fixing nut (321) is embedded in the second fixing hole. The second fixing nut (321) has a fourth threaded hole, and the bottom of the second fixing rod (42) and the second fixing nut (321) are connected by thread for detachment.

11. A battery cell module extrusion testing system, characterized in that, include: The cell module extrusion testing apparatus and the extrusion column (02) as described in any one of claims 1-10; wherein, Several battery cell modules (01) are stacked between the lower end plate (1) and the upper end plate (3). The extrusion column (02) performs an extrusion test on several of the battery cell modules (01) along the length direction of the lower end plate (1) or the upper end plate (3).

Images