A lithium battery multi-point pressure performance test system

Abstract

The invention relates to the field of battery testing technology, in particular to a lithium battery multi-point pressure performance testing system, comprising a multi-stage test operation end, a loading operation end, an intermediate calibration test end and a power test track, wherein the loading operation end is installed at a receiving end of the multi-stage test operation end before testing; by assembling different replaceable impact simulation parts on the exposed surfaces of the ends of a plurality of replaceable impact simulation parts, and adjusting the array angle and the concave-convex height of the replaceable impact simulation parts through a contact surface random rotation angle regulating part and a non-directional impact contact surface regulating part, collision points with different impact intensities are randomly generated, and then a connecting rope, an elastic stretching part and a release bracket are used as power conduction, and multi-point impact of a structural layer is achieved under the reaction force of an array impact structure formed by the replaceable impact simulation parts, and a single throw-off action is used to simulate the state in which a battery pack is affected by multiple collision media at a time, thereby measuring the influence of the battery on multiple performance parameters after the multi-point collision.

Description

Technical Field

[0001] The invention relates to the technical field of battery testing, in particular to a lithium battery multi-point pressure performance testing system. Background Art

[0002] Existing testing methods mainly use face-to-face compression or collision to test whether the live parts of the battery pack are damaged after being stressed. However, if the collision object produces a large impact force on the battery pack during an actual collision, the battery pack is prone to multiple points of stress when it moves and rolls under the impact force. Under this influence, the morphology of the damaged surface of the battery pack varies. Although the damage surface caused by this type of damage is small and the degree is relatively light, its internal load-bearing structure is affected by multiple deformation damage surfaces with different morphologies, and when the compression rate is superimposed, even if no rupture damage occurs, the uneven performance of its internal pressure will cause a decrease in battery capacity, limited air tightness, and disconnection of the live part of the electrical conductive structure. Therefore, in order to avoid the loss of test data, it is necessary to generate battery pack samples with multiple points of stress damage for the test and approval of multiple performance parameters. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a lithium battery multi-point pressure performance testing system.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a lithium battery multi-point pressure performance test system, including a multi-stage test operation end, a loading operation end, an intermediate calibration test end and a power test track, the loading operation end is installed at the receiving end of the multi-stage test operation end before the test, the intermediate calibration test end is installed at the transmission end of the loading operation end after the test, the power test track is set up in the test site, one end of the power test track passes through the intermediate calibration test end and is slidably connected to the intermediate calibration test end, a test forming end transmission component is slidably connected to the inner side of the power test track, a multi-point compression test chamber is set up in the middle section of the power test track, and the test forming end transmission component slides along the power test track and passes through the multi-point compression test chamber;

[0005] A multi-point impact surface forming component is arranged on the inner side of the multi-point compression test chamber, and the multi-point impact surface forming component includes a plurality of contact surface random rotation angle regulating parts, a non-directional impact contact surface regulating part and a replaceable impact simulation part. The contact surface random rotation angle regulating part is arranged in an array along the inner wall of the multi-point impact surface forming component, and the non-directional impact contact surface regulating part is arranged at the transmission end of the contact surface random rotation angle regulating part. The contact surface random rotation angle regulating part is used to adjust the axial angles of the non-directional impact contact surface regulating part and the replaceable impact simulation part, thereby resetting the collision contact inclination angle of the battery after it enters the multi-point compression test chamber and is thrown off. The replaceable impact simulation part is detachably connected to the output end of the non-directional impact contact surface regulating part, and the non-directional impact contact surface regulating part is used to adjust the replaceable impact simulation part.

[0006] Preferably, a first avoidance drive push rod and a second avoidance drive push rod are also provided on the inner side of the multi-point impact surface forming component, the output end of the first avoidance drive push rod is fixedly connected to two groups of contact surface random rotation angle control parts arrayed laterally on the inner wall of the multi-point impact surface forming component, the output end of the second avoidance drive push rod is fixedly connected to the contact surface random rotation angle control parts arrayed at the bottom of the inner wall of the multi-point impact surface forming component, the multi-point compression test chamber is installed with a PLC control component, the PLC control component is connected with the contact surface random rotation angle control part and the non-directional impact contact surface adjustment part by signal, the PLC control component is used to control the collision contact form of any one of the contact surface random rotation angle control part and the non-directional impact contact surface adjustment part.

[0007] Preferably, a fire extinguishing mechanism and a self-locking gate are also provided on one side of the multi-point compression test chamber, the output end of the fire extinguishing mechanism extends to the inner side of the multi-point compression test chamber, the self-locking gate is slidably connected to the entrance end of the multi-point compression test chamber, and the exposed surface of the replaceable impact simulation part is any one of hollow steel, solid steel, solidified asphalt, solidified concrete, marble and wood.

[0008] Preferably, the test forming end transmission assembly includes a mobile sample assembly frame, an axial throw-off drive member, and a sample surface positioning and extension mechanism. The mobile sample assembly frame is slidably connected to the top of the power test track. The axial throw-off drive member is installed on the upper end of the mobile sample assembly frame through a throw-off inclination adjustment structure. The throw-off inclination adjustment structure is used to adjust the test operation inclination angle of the axial throw-off drive member. The output end of the axial throw-off drive member is fixedly connected to the sample surface positioning and extension mechanism. The bottom of the sample surface positioning and extension mechanism is a notch with a flat cross-sectional shape. A throw-off in place sensor unit is also provided on the outside of the mobile sample assembly frame. The throw-off in place sensor unit is used to trigger an unlocking signal of the sample surface positioning and extension mechanism when the mobile sample assembly frame moves to the multi-point compression test chamber.

[0009] Preferably, a winding mechanism and a release bracket are respectively provided at the front and rear ends of the power test track, the driving end of the winding mechanism is connected to a connecting rope, one end of the release bracket is fixedly connected to the mobile sample assembly frame, the other end of the release bracket is slidably connected to the power test track, and an electromagnetic lock is provided between the release bracket and the power test track, one end of the connecting rope is detachably connected to an elastic stretching piece, one end of the elastic stretching piece is wound around the outside of the release bracket, and the elastic stretching piece is made of a latex tube.

[0010] Preferably, a return stroke transmission chain group is provided on the inner side of the power test track, one end of the return stroke transmission chain group is fixedly connected to the multi-point compression test bin, and the other end of the return stroke transmission chain group is connected to an external traction mechanism, and the return stroke transmission chain group is used to tow the multi-point compression test bin to debug the test moving distance between the multi-point compression test bin and the multi-stage test operation end.

[0011] Preferably, the multi-stage test operation end includes an air tightness test bench, a capacitance parameter test bench and a conduction test bench, and the air tightness test bench, the capacitance parameter test bench and the conduction test bench are used to test the performance parameters of the battery pack before and after it is damaged.

[0012] Preferably, a processed sample return measurement end is installed at one end of the power test track away from the multi-stage test operation end, and the processed sample return measurement end includes a damage surface image analysis mechanism and a secondary measurement and sorting mechanism. The damage surface image analysis mechanism and the secondary measurement and sorting mechanism are arranged at the tail of the power test track transmission end. The damage surface image analysis mechanism is used to determine whether multi-point compression occurs in the battery component after being thrown off and impacted from the inside of the multi-point compression test chamber. The secondary measurement and sorting mechanism is used to return the battery component after the damage surface is formed to the test formation end transmission assembly.

[0013] Preferably, a gripping mechanical component and a one-time measurement and sorting mechanism are provided between the loading operation end and the intermediate calibration test end, the one-time measurement and sorting mechanism is used to sort the battery packs that have passed the preliminary performance test at the multi-stage test operation end to the position of the gripping mechanical component, and the gripping mechanical component is used to assemble the battery packs to the inner side of the mobile sample assembly rack.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: after the test-forming end transmission assembly is assembled with a battery pack, different replaceable impact simulation parts are assembled on the exposed surfaces of the ends of the replaceable impact simulation parts, and the array angles and concave-convex heights of the replaceable impact simulation parts are adjusted by the contact surface random rotation angle control part and the non-directional impact contact surface adjustment part, and collision points with different impact intensities are randomly generated. Then, the connecting rope, the elastic stretching part and the release bracket are used as power transmission, and the instantaneous force generated by the stretching and contraction of the elastic stretching part transmits the test-forming end transmission assembly to the inside of the multi-point compression test chamber, and is thrown into place by the sensor unit When the transmission assembly at the element determination test forming end reaches the inner side of the multi-point compression test chamber, the sample surface positioning extension mechanism is controlled to unlock the battery pack, so that the battery pack is thrown off and enters the inner side of the multi-point compression test chamber. Then, the multi-point impact of the structural layer is realized under the reaction force of the array impact structure formed by the replaceable impact simulation part. The state of the battery pack being affected by multiple collision media at a time is simulated through a single throwing-off action, and the structural performance after continuous impact is obtained. Finally, the multi-parameter test of air tightness, capacitance parameters and conduction performance is carried out on the multi-point collision sample for the second time through the multi-stage test operation end, so as to measure the influence of the battery on multiple performance parameters after the multi-point collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0018] Figure 3 It is a structural schematic diagram of the multi-point compression test chamber in the present invention.

[0019] In the figure: 1. Multi-stage test operation end; 11. Air tightness test bench; 12. Capacitance parameter test bench; 13. Conductivity test bench; 2. Loading operation end; 21. Gripping mechanical components; 22. One-time measurement and sorting mechanism; 3. Intermediate calibration test end; 4. Power test track; 41. Return stroke transmission chain group; 5. Test formation end transmission assembly; 51. Mobile sample assembly rack; 52. Axial throw-off drive component; 53. Sample surface positioning extension mechanism; 54. Throw-off inclination adjustment structure; 55. Throw-off in place sensor unit; 6. Multi-point compression Test chamber; 61. Multi-point impact surface forming component; 611. Contact surface random rotation angle control unit; 612. Non-directional impact contact surface adjustment unit; 613. Replaceable impact simulation unit; 614. First avoidance drive push rod; 615. Second avoidance drive push rod; 62. Fire extinguishing mechanism; 63. PLC control component; 64. Self-locking gate; 7. Processed sample returns to the measurement end; 71. Damage surface image analysis mechanism; 72. Secondary measurement and sorting mechanism; 8. Winding mechanism; 81. Connecting rope; 82. Elastic stretching member; 83. Release bracket. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] like Figure 1-Figure 3 As shown, a lithium battery multi-point pressure performance test system described in the present invention includes a multi-stage test operation end 1, a loading operation end 2, an intermediate calibration test end 3 and a power test track 4, the loading operation end 2 is installed at the receiving end of the multi-stage test operation end 1 before the test, the intermediate calibration test end 3 is installed at the transmission end after the test of the loading operation end 2, the power test track 4 is set up in the test site, one end of the power test track 4 passes through the intermediate calibration test end 3 and is slidably connected to the intermediate calibration test end 3, the inner side of the power test track 4 is slidably connected with a test forming end transmission component 5, the middle section of the power test track 4 is set with a multi-point compression test chamber 6, and the test forming end transmission component 5 slides along the power test track 4 and passes through the multi-point compression test chamber 6.

[0022] In the present embodiment, since the battery pack is prone to multi-point force when it moves and rolls under the action of impact force, the morphology of the damaged surface of the battery pack is different under the influence, and its internal load-bearing structure is affected by multiple deformation damage surfaces with different morphologies, when the compression rate is increased, even if no rupture damage occurs, the uneven internal pressure will cause the battery capacity to decrease, the airtightness to be limited, and the disconnection of the electrically conductive structure of the live part. Therefore, in order to avoid the traditional collision simulation test method from being unable to generate a sample body for testing the battery capacity, airtightness and electrical conductivity disconnection, resulting in the loss of test data, the present invention proposes a lithium battery multi-point pressure performance testing system.

[0023] The multi-stage test operation end 1 includes an airtightness test bench 11, a capacitance parameter test bench 12 and a conduction test bench 13. The airtightness test bench 11, the capacitance parameter test bench 12 and the conduction test bench 13 are used to test the performance parameters of the battery pack before and after it is damaged.

[0024] In this embodiment, the loading operation end 2 is a belt transmission rail, which is used to transport the battery pack selected as a sample to the multi-stage test operation end 1. The airtightness test bench 11, the capacitance parameter test bench 12 and the conduction test bench 13 arranged in the multi-stage test operation end 1 are all test instruments known in the art. After the loading operation end 2 initially transports the battery pack to the multi-stage test operation end 1, it first performs a benchmark parameter test through the airtightness test bench 11, the capacitance parameter test bench 12 and the conduction test bench 13, and after the test, the battery pack that has not completed the benchmark parameter test verification is clamped and placed in the primary measurement sorting mechanism 22 by the gripping mechanical component 21, and the battery pack that has passed the benchmark parameter test verification is clamped on the inner side end of the mobile sample assembly frame 51 by the gripping mechanical component 21, and the battery pack is fixed by the sample surface positioning extension mechanism 53 (which is an electrically controlled clamp), thereby completing the pretreatment before the multi-point collision test, wherein the mobile sample assembly frame 51 is located at the inner side position of the middle calibration test end 3 in the initial state.

[0025] A multi-point impact surface forming component 61 is arranged on the inner side of the multi-point compression test chamber 6. The multi-point impact surface forming component 61 includes a plurality of contact surface random rotation angle regulating parts 611, a non-directional impact contact surface regulating part 612 and a replaceable impact simulation part 613. The contact surface random rotation angle regulating parts 611 are arranged in an array along the inner wall of the multi-point impact surface forming component 61. The non-directional impact contact surface regulating part 612 is arranged at the transmission end of the contact surface random rotation angle regulating part 611. The contact surface random rotation angle regulating part 611 is used to adjust the axial angles of the non-directional impact contact surface regulating part 612 and the replaceable impact simulation part 613, thereby resetting the collision contact inclination angle of the battery after it enters the multi-point compression test chamber 6 and is thrown off. The replaceable impact simulation part 613 is detachably connected to the output end of the non-directional impact contact surface regulating part 612, and the non-directional impact contact surface regulating part 612 is used to adjust the replaceable impact simulation part 613.

[0026] In an optional implementation of the present embodiment, a first avoidance drive push rod 614 and a second avoidance drive push rod 615 are further provided on the inner side of the multi-point impact surface forming component 61, the output end of the first avoidance drive push rod 614 is fixedly connected to two groups of contact surface random rotation angle control parts 611 arrayed laterally on the inner wall of the multi-point impact surface forming component 61, the output end of the second avoidance drive push rod 615 is fixedly connected to the contact surface random rotation angle control parts 611 arrayed at the bottom of the inner wall of the multi-point impact surface forming component 61, the multi-point compression test chamber 6 is installed with a PLC control component 63, the PLC control component 63 is signal-connected to the contact surface random rotation angle control part 611 and the non-directional impact contact surface adjustment part 612, the PLC control component 63 is used to control the collision contact form of any contact surface random rotation angle control part 611 and the non-directional impact contact surface adjustment part 612.

[0027] In an optional implementation of the present embodiment, a fire extinguishing mechanism 62 and a self-locking gate 64 are further provided on one side of the multi-point compression test chamber 6, the output end of the fire extinguishing mechanism 62 extends to the inner side of the multi-point compression test chamber 6, the self-locking gate 64 is slidably connected to the entrance end of the multi-point compression test chamber 6, and the exposed surface of the replaceable impact simulation part 613 is any one of hollow steel, solid steel, solidified asphalt, solidified concrete, marble and wood materials.

[0028] In this embodiment, the replaceable impact simulation part 613 is used to fill the exposed surface collision material by opening a groove, and any one of hollow steel, solid steel, solidified asphalt, solidified concrete, marble and wooden materials is made into a "T"-shaped insertion structure with a matching groove shape to realize the construction of the exposed collision surface.

[0029] In this embodiment, after assembling different replaceable impact simulation parts on the exposed surfaces of the ends of several replaceable impact simulation parts, the array angle and the concave-convex height of the replaceable impact simulation part 613 are adjusted by the contact surface random rotation angle control part 611 and the non-directional impact contact surface adjustment part 612, and collision points with different impact intensities are randomly generated. Then, the connecting rope 81, the elastic stretching member 82 and the release bracket 83 are used as power transmission. The instantaneous force generated by the stretching and contraction of the elastic stretching member 82 transmits the test forming end transmission component 5 to the inside of the multi-point compression test chamber 6, and the throw-off position sensing unit 55 determines that when the test forming end transmission component 5 reaches the inside of the multi-point compression test chamber 6, the sample surface positioning extension mechanism 53 is controlled to unlock the battery pack, so that the battery pack is thrown off and then enters After entering the inner side of the multi-point compression test chamber 6, multi-point impact of the structural layer is realized under the reaction force of the array impact structure formed by the replaceable impact simulation part 613, wherein a damping layer is set at the rotation connection between the contact surface random rotation angle adjustment part 611 and the non-directional impact contact surface adjustment part 612, which is used for the friction force after the rotation adjustment of the non-directional impact contact surface adjustment part 612, so that the non-directional impact contact surface adjustment part 612 can be positioned after rotation, and the non-directional impact contact surface adjustment part 612 on the inner side of the contact surface random rotation angle adjustment part 611 can be rotated to any angle, and the non-directional impact contact surface adjustment part 612 is driven to extend the replaceable impact simulation part 613 to any propulsion length, thereby generating replaceable impact simulation parts 613 with different angles as collision points.

[0030] In an optional implementation manner of the present embodiment, the test forming end transmission assembly 5 includes a mobile sample assembly frame 51, an axial throw-off drive member 52, and a sample surface positioning extension mechanism 53. The mobile sample assembly frame 51 is slidably connected to the top of the power test track 4. The axial throw-off drive member 52 is installed on the upper end of the mobile sample assembly frame 51 through a throw-off inclination adjustment structure 54. The throw-off inclination adjustment structure 54 is used to adjust the test operation inclination of the axial throw-off drive member 52. The output end of the axial throw-off drive member 52 is fixedly connected to the sample surface positioning extension mechanism 53. The bottom of the sample surface positioning extension mechanism 53 is a notch with a flat cross-sectional shape. The mobile sample assembly A throw-away-in-place sensor unit 55 is also provided on the outer side of the rack 51. The throw-away-in-place sensor unit 55 is used to trigger the unlocking signal of the sample surface positioning and extension mechanism 53 when the mobile sample assembly rack 51 moves to the multi-point compression test chamber 6. The front end opening of the multi-point compression test chamber 6 is provided with an induction coil for triggering the signal of the throw-away-in-place sensor unit 55. After the mobile sample assembly rack 51 moves to the multi-point compression test chamber 6, when the throw-away-in-place sensor unit 55 reaches the position of the induction coil, the throw-away-in-place sensor unit 55 sends a disconnection signal to the sample surface positioning and extension mechanism 53, so that the battery pack is detached from the inner side of the mobile sample assembly rack 51 into the multi-point compression test chamber 6.

[0031] In this embodiment, after the battery pack is clamped to the inner side of the mobile sample assembly frame 51 by the gripping mechanical member 21, the battery pack is gripped and fixed by the sample surface positioning extension mechanism 53, wherein the throw-off inclination adjustment structure 54 realizes its own angle adjustment by installing a motor, and after the battery pack is fixed by the sample surface positioning extension mechanism 53, the operation angle of the axial throw-off drive member 52 is adjusted by the throw-off inclination adjustment structure 54 according to the requirement of the throw-off angle during the test, and then the axial throw-off drive member 52 drives the sample surface positioning extension mechanism 53 to drive the battery pack to rotate and swing, which serves as the power generation end when the battery is thrown off by the rotational force. Among them, the rotation path of the axial throw-off drive member 52 is only along one side close to the multi-point compression test chamber 6, and it rotates and swings back and forth in a radius.

[0032] In an optional implementation of the present embodiment, a winding mechanism 8 and a release bracket 83 are respectively provided at the front and rear ends of the power test track 4, the driving end of the winding mechanism 8 is connected to a connecting rope 81, one end of the release bracket 83 is fixedly connected to the mobile sample assembly frame 51, the other end of the release bracket 83 is slidingly connected to the power test track 4, and an electromagnetic lock is provided between the release bracket 83 and the power test track 4, one end of the connecting rope 81 is detachably connected to an elastic stretching piece 82, one end of the elastic stretching piece 82 is wound around the outside of the release bracket 83, and the elastic stretching piece 82 is made of a latex tube.

[0033] In this embodiment, mutually adapted clamps are installed between the connecting rope 81 and the elastic stretching member 82. After the sample surface positioning and extension mechanism 53 on the inner side of the mobile sample assembly frame 51 fixes the battery pack, the connecting rope 81 is driven by the winding mechanism 8 to extend toward the release bracket 83 until the connecting rope 81 is transported to the front end position of the elastic stretching member 82. The connecting rope 81 and the elastic stretching member 82 are then fixed to each other by the clamps between the connecting rope 81 and the elastic stretching member 82 to achieve the connection between the connecting rope 81 and the elastic stretching member 82. After the connecting rope 81 and the elastic stretching member 82 are connected to each other by the clamps, the release bracket 83 is used as the fixing point of the elastic stretching member 82. The winding mechanism 8 is controlled to wind up the connecting rope 81, so that the elastic stretching member 82 is stretched in the direction of the winding mechanism 8 to store energy under the traction force of the connecting rope 81. After the elastic stretching member 82 is stretched to the required length for the current test, the preparation before the test is completed. Among them, since an electromagnetic lock is provided between the release bracket 83 and the power test track 4, when the connection rope 81 pulls the elastic tensile member 82 to stretch, the release bracket 83 remains in a fixed state.

[0034] In an optional implementation of the present embodiment, a return stroke transmission chain group 41 is provided on the inner side of the power test track 4, one end of the return stroke transmission chain group 41 is fixedly connected to the multi-point compression test bin 6, and the other end of the return stroke transmission chain group 41 is connected to an external traction mechanism, and the return stroke transmission chain group 41 is used to tow the multi-point compression test bin 6 to debug the test moving distance between the multi-point compression test bin 6 and the multi-stage test operation end 1.

[0035] In this embodiment, traction drive components are provided at both ends of the power test track 4, and the traction drive components are used to realize the forward and backward traction of the return stroke transmission chain group 41. The return stroke transmission chain group 41 is pulled forward and backward by the power test track 4 to debug the test stroke between the multi-point compression test chamber 6 and the intermediate calibration test end 3, thereby reserving the moving distance of the battery pack during high-speed sliding acceleration, so that the battery pack can be thrown off from the fixed end of the sample surface positioning extension mechanism 53 after reaching the sliding speed.

[0036] In an optional implementation of the present embodiment, a processed sample return measurement end 7 is installed at one end of the power test track 4 away from the multi-stage test operation end 1. The processed sample return measurement end 7 includes a damage surface image analysis mechanism 71 and a secondary measurement and sorting mechanism 72. The damage surface image analysis mechanism 71 and the secondary measurement and sorting mechanism 72 are arranged at the tail end of the transmission end of the power test track 4. The damage surface image analysis mechanism 71 is used to determine whether multi-point compression occurs in the battery component after being thrown off and impacted from the inside of the multi-point compression test chamber 6. The secondary measurement and sorting mechanism 72 is used to return the battery component after the damage surface is formed to the test formation end transmission component 5.

[0037] In the present embodiment, after the battery pack enters the inner side of the multi-point compression test chamber 6 and completes the multi-point impact, the battery pack is manually transferred to the processed sample return measurement end 7, and the damage surface image analysis mechanism 71 performs image acquisition of the battery pack to analyze the degree of damage of the current battery pack after the multi-point impact. If the battery pack directly produces surface rupture and leakage, the ruptured battery is sorted and transported to the scrap area by the secondary measurement and sorting mechanism 72. If the battery pack only has impact pits or deformation on the surface, the deformed battery is re-transported to the multi-stage test operation end 1, and the secondary test is started through the air tightness test bench 11, the capacitance parameter test bench 12 and the conduction test bench 13. Among them, since the battery pack that has not reached the test intensity and is completely damaged does not need to be subjected to secondary measurement, the setting of the damage surface image analysis mechanism 71 and the secondary measurement and sorting mechanism 72 is only to sort the completely damaged battery pack. Since the improvement content of the present invention is not this part, conventional technical means in the field can be used to achieve image acquisition and analysis, and this embodiment will not repeat this principle.

[0038] In an optional implementation of the present embodiment, a gripping mechanical component 21 and a one-time measurement and sorting mechanism 22 are provided between the loading operation end 2 and the intermediate calibration test end 3. The one-time measurement and sorting mechanism 22 is used to sort the battery packs that have passed the preliminary performance test at the multi-stage test operation end 1 to the position of the gripping mechanical component 21. The gripping mechanical component 21 is used to assemble the battery packs to the inner side of the mobile sample assembly rack 51.

[0039] The working principle of the present invention is as follows: the battery pack selected as a sample is transported to the multi-stage test operation end 1 through the loading operation end 2, and the reference parameter test is performed by the airtightness test bench 11, the capacitance parameter test bench 12 and the conduction test bench 13. After the test, the battery pack that has not completed the reference parameter test verification is clamped and placed in the primary measurement sorting mechanism 22 by the gripping mechanical component 21, and the battery pack that has passed the reference parameter test verification is clamped by the gripping mechanical component 21 at the inner side end of the mobile sample assembly rack 51, and the sample surface positioning extension mechanism is used. 53 fixes the battery pack, and then controls the throw-off inclination adjustment structure 54 to adjust the throw-off angle of the battery pack after it is fixed, so as to prevent the battery pack from being blocked by the mobile sample assembly frame 51 when it is thrown out from the inner side of the mobile sample assembly frame 51. After completion, the axial throw-off driving member 52 is controlled to drive the radius of the battery pack fixed by the sample surface positioning extension mechanism 53 to rotate and swing back and forth. After that, the winding mechanism 8 is controlled to wind up the connecting rope 81, so that the elastic stretching member 82 is stretched to the direction of the winding mechanism 8 under the traction force of the connecting rope 81 to store energy. After the elastic stretching member 82 is stretched to the required length for the current test, the release bracket 83 is controlled to be closed, and the positioning between the release bracket 83 and the power test track 4 is disconnected. At this time, the axial throw-off driving member 52 quickly elastically contracts in the direction of the winding mechanism 8, driving the mobile sample assembly frame 51 to quickly move to the multi-point compression test chamber 6 through the sample surface positioning extension mechanism 53 and the sliding path restriction of the power test track 4, until the throw-off position sensing unit 55 reaches the induction coil position, and the throw-off position sensing unit 55 sends a disconnection signal to the sample surface positioning extension mechanism 53, so that the battery pack is released from the positioning of the sample surface positioning extension mechanism 53, and at the same time, the battery pack is detached from the inner side of the mobile sample assembly frame 51 under the force generated by the rotation and swing of the axial throw-off driving member 52, and thrown to the multi-point compression test chamber 6, and finally, under the reaction force of the array impact structure formed by the replaceable impact simulation part 613 of the battery pack, a multi-point impact of multiple structural layers is realized in the multi-point compression test chamber 6, and a single throw-off action is used to simulate the state of the battery pack being affected by multiple collision media at a time. After the multi-point impact, the battery pack tested in the multi-point compression test chamber 6 is manually transferred to the processed sample return measurement end 7, and the damage surface image analysis mechanism 71 collects the image of the battery pack to analyze the degree of damage to the current battery pack after the multi-point impact. If the battery pack only has impact dents or deformation on the surface, the deformed battery is manually transferred back to the multi-stage test operation end 1, and the secondary test is started through the airtightness test bench 11, the capacitance parameter test bench 12 and the conduction test bench 13 to obtain the airtightness, capacitance parameters and conduction performance parameters of the multi-point collision sample after the multi-point collision.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium battery multi-point pressure performance test system, comprising a multi-stage test operation end (1), a loading operation end (2), an intermediate calibration test end (3) and a power test track (4), characterized in that: The loading operation end (2) is installed at the receiving end of the multi-stage test operation end (1) before the test, the intermediate calibration test end (3) is installed at the transmission end of the loading operation end (2) after the test, the power test track (4) is set up at the test site, one end of the power test track (4) passes through the intermediate calibration test end (3) and is slidably connected to the intermediate calibration test end (3), the inner side of the power test track (4) is slidably connected with a test forming end transmission component (5), the middle section of the power test track (4) is set up with a multi-point compression test chamber (6), and the test forming end transmission component (5) slides along the power test track (4) and passes through the multi-point compression test chamber (6); A multi-point impact surface forming component (61) is arranged inside the multi-point compression test chamber (6), and the multi-point impact surface forming component (61) comprises a plurality of contact surface random rotation angle regulating parts (611), a non-directional impact contact surface regulating part (612), and a replaceable impact simulation part (613), wherein the contact surface random rotation angle regulating parts (611) are arranged in an array along the inner wall of the multi-point impact surface forming component (61), and the non-directional impact contact surface regulating parts (612) are arranged at the contact surface random rotation angle regulating parts (611). At the transmission end, the contact surface random rotation angle regulating portion (611) is used to adjust the axial angles of the non-directional impact contact surface regulating portion (612) and the replaceable impact simulation portion (613), thereby resetting the collision contact inclination angle of the battery after it enters the multi-point compression test chamber (6) and is thrown off; the replaceable impact simulation portion (613) is detachably connected to the output end of the non-directional impact contact surface regulating portion (612); and the non-directional impact contact surface regulating portion (612) is used to adjust the replaceable impact simulation portion (613); A first avoidance driving push rod (614) and a second avoidance driving push rod (615) are also provided on the inner side of the multi-point impact surface forming component (61), the output end of the first avoidance driving push rod (614) being fixedly connected to two groups of contact surface random rotation angle control parts (611) arrayed laterally on the inner wall of the multi-point impact surface forming component (61), and the output end of the second avoidance driving push rod (615) being fixedly connected to the contact surface random rotation angle control parts (611) arrayed at the bottom of the inner wall of the multi-point impact surface forming component (61). The multi-point compression test chamber (6) is equipped with a PLC control component (63), the PLC control component (63) being signal-connected to the contact surface random rotation angle control parts (611) and the non-directional impact contact surface control parts (612), and the PLC control component (63) being used to control the collision contact form of any of the contact surface random rotation angle control parts (611) and the non-directional impact contact surface control parts (612).

2. A lithium battery multi-point pressure performance testing system according to claim 1, characterized in that: A fire extinguishing mechanism (62) and a self-locking gate (64) are also provided on one side of the multi-point compression test chamber (6); an output end of the fire extinguishing mechanism (62) extends to the inside of the multi-point compression test chamber (6); the self-locking gate (64) is slidably connected to an inlet end of the multi-point compression test chamber (6); and an exposed surface of the replaceable impact simulation part (613) is any one of hollow steel, solid steel, solidified asphalt, solidified concrete, marble and wood.

3. A lithium battery multi-point pressure performance testing system according to claim 1, characterized in that: The test forming end transmission assembly (5) comprises a mobile sample assembly frame (51), an axial throw-off driving member (52), and a sample surface positioning extension mechanism (53). The mobile sample assembly frame (51) is slidably connected to the top of the power test track (4). The axial throw-off driving member (52) is mounted on the upper end of the mobile sample assembly frame (51) via a throw-off inclination adjustment structure (54). The throw-off inclination adjustment structure (54) is used to adjust the test operation inclination of the axial throw-off driving member (52). The output end of the axial throw-off driving member (52) is fixedly connected to the sample surface positioning extension mechanism (53). The bottom of the sample surface positioning extension mechanism (53) is a notch with a plane cross-sectional shape. The outer side of the mobile sample assembly frame (51) is also provided with a throw-off in place sensor unit (55). The throw-off in place sensor unit (55) is used to trigger an unlocking signal of the sample surface positioning extension mechanism (53) when the mobile sample assembly frame (51) moves to the multi-point compression test chamber (6).

4. A lithium battery multi-point pressure performance testing system according to claim 3, characterized in that: The front and rear ends of the power test track (4) are respectively provided with a winding mechanism (8) and a release bracket (83); the driving end of the winding mechanism (8) is connected to a connecting rope (81); one end of the release bracket (83) is fixedly connected to the mobile sample assembly rack (51); the other end of the release bracket (83) is slidably connected to the power test track (4); an electromagnetic lock is provided between the release bracket (83) and the power test track (4); one end of the connecting rope (81) is detachably connected to an elastic stretching member (82); one end of the elastic stretching member (82) is wound around the outside of the release bracket (83); and the elastic stretching member (82) is made of a latex tube.

5. A lithium battery multi-point pressure performance testing system according to claim 1, characterized in that: A return travel transmission chain group (41) is arranged inside the power test track (4), one end of the return travel transmission chain group (41) is fixedly connected to the multi-point compression test chamber (6), and the other end of the return travel transmission chain group (41) is connected to an external traction mechanism, and the return travel transmission chain group (41) is used to tow the multi-point compression test chamber (6) to debug the test movement distance between the multi-point compression test chamber (6) and the multi-stage test operation end (1).

6. A lithium battery multi-point pressure performance testing system according to claim 1, characterized in that: The multi-stage test operation end (1) comprises an airtightness test bench (11), a capacitance parameter test bench (12) and a conduction test bench (13); the airtightness test bench (11), the capacitance parameter test bench (12) and the conduction test bench (13) are used to test the performance parameters of a battery pack before it is thrown off and after it is damaged.

7. A lithium battery multi-point pressure performance testing system according to claim 1, characterized in that: A processed sample return measurement end (7) is installed at one end of the power test track (4) away from the multi-stage test operation end (1). The processed sample return measurement end (7) comprises a damage surface image analysis mechanism (71) and a secondary measurement sorting mechanism (72). The damage surface image analysis mechanism (71) and the secondary measurement sorting mechanism (72) are arranged at the tail end of the transmission end of the power test track (4). The damage surface image analysis mechanism (71) is used to determine whether a battery assembly generates multi-point compression after being thrown off and impacted from the inside of the multi-point compression test chamber (6). The secondary measurement sorting mechanism (72) is used to return the battery assembly after the damage surface is formed to the test formation end transmission assembly (5).

8. A lithium battery multi-point pressure performance testing system according to claim 4, characterized in that: A gripping mechanical component (21) and a primary measurement sorting mechanism (22) are provided between the loading operation end (2) and the intermediate calibration test end (3); the primary measurement sorting mechanism (22) is used to sort the battery packs that have passed the preliminary performance test of the multi-stage test operation end (1) to the position of the gripping mechanical component (21); and the gripping mechanical component (21) is used to assemble the battery packs to the inner side of the mobile sample assembly rack (51).

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