Battery pack impact detection device and detection method

Abstract

The embodiment of the invention provides a battery pack impact detection device and detection method, and relates to the technical field of battery pack impact detection. A battery pack impact detection device comprises a bottom frame, the rear side of the bottom frame is fixedly connected with a side barrel with a PLC, the top of the side barrel is fixedly connected with a top frame, and the two sides of the bottom frame are fixedly connected with cylinder barrels; a rotating assembly is arranged in the top frame, and a transposition assembly used in cooperation with the rotating assembly is arranged on the top frame. A main detection assembly used in cooperation with the transposition assembly is arranged in the side cylinder, and auxiliary detection assemblies matched with the main detection assembly in a linkage mode are arranged on the two sides of the bottom frame. A conversion assembly used in cooperation with the cylinder barrel is arranged in the bottom frame. And a plane impact head, a prism impact head or a pointed cone impact head is driven to orderly carry out single-time pressing impact or reciprocating pressing impact motion on the battery packs on the placing rack, so that the bearing conditions of the battery packs under the action of impact forces in different shapes are obtained, and the detection result is more comprehensive and accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery pack impact detection, and particularly relates to a battery pack impact detection device and a detection method. Background Art

[0002] A battery pack is an integrated system composed of multiple battery cells (battery monomers) through specific designs, including core components such as battery cells, modules, a battery management system (BMS), and a high-strength housing. To simulate scenarios of violent impacts during transportation and use, detect the structural integrity and leak prevention ability of the battery pack under extreme mechanical impacts, prevent potential safety hazards such as battery cell deformation and short circuits, and consider durability during high-intensity driving (such as mountain roads and high-speed driving) or transportation bumps, it is necessary to perform impact detection on the completed battery pack.

[0003] In the prior art (a patent application with the publication number CN222318385U and the patent name "An Impact Detection Device for a Battery Pack"), the battery pack is limited by a limiting component. The electric push rod is started to drive the connecting plate and the fixing plate to move. The movement of the fixing plate drives the impact head to move up and down. After the adjustment is completed, the motor is started to drive the cam to rotate. The rotating cam cooperates with the spring to realize the up-and-down reciprocating movement of the limiting plate, the telescopic rod, the mounting plate, and the impact head. The up-and-down reciprocating impact head can perform reciprocating impacts on the battery pack to achieve the purpose of anti-impact detection. In the process of implementing this technical solution, it is found that at least the following problems exist in the prior art:

[0004] Considering the evaluation of safety and the verification of reliability, during the impact detection of the battery pack, mostly a single-shaped impact head is used to perform the impact detection. Since the destructive forces generated by foreign objects of different shapes in actual use scenarios are different, the impact detection of the battery pack is relatively one-sided, and the accuracy of the obtained detection results is not high. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems in the prior art that the shape of the impact head is too single, resulting in relatively one-sided impact detection of the battery pack and low accuracy of the obtained detection results.

[0006] To achieve the above object, the specific technical solution of the present invention is as follows:

[0007] A battery pack impact detection device, comprising a chassis, a side cylinder with a PLC controller is fixedly connected to the rear side of the chassis, and a top frame is fixedly connected to the top of the side cylinder. Cylinder barrels are fixedly connected to both sides of the chassis; A rotating assembly is arranged in the top frame, and the rotating assembly includes a double-headed motor fixed between the side cylinder and the top frame. A transposition assembly is arranged on the top frame and is used in cooperation with the rotating assembly; A main detection assembly is arranged in the side cylinder and is used in cooperation with the transposition assembly. The main detection assembly includes a driving bevel gear fixed on an output shaft of the double-headed motor. Auxiliary detection assemblies are arranged on both sides of the chassis and are in linkage cooperation with the main detection assembly; A conversion assembly is arranged in the chassis and is used in cooperation with the cylinder barrel. The conversion assembly includes optical rods fixed on both sides of the inner cavity of the chassis. A refrigeration assembly for temperature control cooperation with the chassis is arranged on the outer side of the cylinder barrel.

[0008] Preferably, the rotating assembly further includes a first electric push rod embedded in the other output shaft of the double-headed motor, and a driving circular gear is fixedly connected to the piston rod of the first electric push rod. Planetary circular gears used in cooperation with the driving circular gear are rotatably connected to the four sides of the inner cavity of the top frame, and a toothed ring is meshed with the outer side of the planetary circular gear. Sliding seats slidably matched with the top frame are fixedly connected to the four sides of the toothed ring.

[0009] Preferably, the transposition assembly includes a first circuit breaker fixed on one side of the sliding seat, and a first electromagnet used in cooperation with the first circuit breaker is fixedly connected to the outer side of the sliding seat. A first magnet is adsorbed on the outer side of the first electromagnet, and a flat impact head, a prism impact head and a pointed cone impact head are respectively fixedly connected to the outer side of the first magnet and are distributed at equal triangular intervals along the transverse axis of the top frame.

[0010] Preferably, the main detection assembly further includes a second electric push rod rotatably arranged on the top of the side cylinder, and a driven bevel gear used in cooperation with the driving bevel gear is fixedly connected to the piston rod of the second electric push rod. A reciprocating lead screw rotatably matched with the side cylinder is fixedly connected to the bottom of the second electric push rod, and a lead screw sleeve is threadedly connected to the reciprocating lead screw. A connecting arm is fixedly connected to the front side of the lead screw sleeve.

[0011] Preferably, the auxiliary detection assembly includes a placement rack slidably arranged in the chassis, and a limiting groove is formed in the placement rack. Support shafts are fixedly connected to both sides of the chassis, and swing arms used in cooperation with the chassis are hinged to both sides of the support shafts. Support arms are hinged to both sides of the placement rack, and hinge shafts used in hinged cooperation with the swing arms are fixedly connected to the ends of the support arms. A lateral impact head is arranged on the top of the swing arm.

[0012] Preferably, the conversion component further includes connecting arms hinged to both sides of the bottom of the placement rack, and the ends of the connecting arms are hinged with sliding sleeves that are slidably matched with the optical rods. A T-shaped rod that is slidably matched with the chassis and the cylinder barrel is fixedly connected to the inner side of the sliding sleeve, and a piston head that is slidably matched with the cylinder barrel is fixedly connected to the outer side of the T-shaped rod. A return spring fixedly matched with the chassis is sleeved on the T-shaped rod.

[0013] Preferably, the refrigeration component includes a four-way valve connected to the outside of the cylinder barrel and is provided with a pressure sensor. Both ends of the four-way valve are connected with threaded hoses. The top of the threaded hose is connected with a booster tank, and the outer end of the booster tank is connected with a first three-way joint. The inner end of the first three-way joint is connected with a cold delivery cover, and refrigerators with refrigeration fins are embedded on both sides of the cold delivery cover.

[0014] Preferably, annular slide rails slidably matched with the sliding seats are provided on both sides of the top frame, and a main pressure sensor is embedded on the flat impact head. A strip-shaped chute slidably matched with the connecting arm is provided on the front side of the side cylinder, and a second circuit breaker is fixedly connected to the connecting arm. A second electromagnet is fixedly connected to the front side of the connecting arm, and second magnets used in cooperation with the second electromagnet are fixedly connected to the rear sides of the flat impact head, the prism impact head, and the cone impact head.

[0015] Preferably, an auxiliary pressure sensor is embedded on the inner side of the lateral impact head, and an adjusting bolt is threadedly connected to the top of the rocker arm. A universal ball head hinged with the lateral impact head is arranged inside the adjusting bolt, and buffer springs fixedly matched with the sliding sleeve are sleeved on both sides of the optical rod. Double-headed cylinders are embedded on both sides of the inner cavity of the chassis, and the two piston rods of the double-headed cylinders are fixedly connected with a protective cover embedded with the cold delivery cover through a connecting seat. A guide rail strip is fixedly connected to the inner side of the protective cover, and guide rail grooves slidably matched with the guide rail strip are provided on both sides of the chassis. A temperature sensor and a smoke sensor are diagonally embedded on the top of the protective cover, and a flow equalizing net is embedded on the inner side of the cold delivery cover.

[0016] The battery pack impact detection device and detection method of the present invention have the following advantages:

[0017] 1. For this battery pack impact detection device and detection method, first, the first electric push rod adjusts the meshing stroke of the driving circular gear and the three planetary circular gears. Then, the double-headed motor drives the ring gear to perform linear rotation through the meshed driving circular gear and the three planetary circular gears. The ring gear drives the flat impact head, the prism impact head, and the cone impact head to rotate and displace in an orderly manner through the three sliding seats, achieving the effective displacement effect of different-shaped impact heads without manual replacement, which provides convenience for the subsequent impact detection work of the battery pack. Immediately afterwards, first, the second electric push rod adjusts the meshing stroke of the driven bevel gear and the driving bevel gear. Then, the double-headed motor drives the reciprocating lead screw to rotate through the meshed driving bevel gear and the driven bevel gear. The reciprocating lead screw drives the connecting arm to perform a single downward press or a reciprocating downward press through the lead screw sleeve. Then, the connecting arm drives the flat impact head, the prism impact head, or the cone impact head to perform a single downward impact or a reciprocating downward impact on the battery pack on the placement rack in an orderly manner, obtaining the bearing condition of the battery pack under different-shaped impact forces, making the detection result more comprehensive and accurate. At the same time, when the battery pack is under the downward impact force of the flat impact head, the prism impact head, or the cone impact head, first, two supporting shafts provide articulated support and cooperation for the four rocker arms. Then, the placement rack drives the four support arms to perform outward expansion and inward movement. The four support arms drive the four rocker arms to move outward and inward back and forth through the hinge shaft. Then, the four rocker arms drive the four side impact heads to perform single or reciprocating knocking on the side of the battery pack following the downward press of the flat impact head, the prism impact head, or the cone impact head, achieving the synchronous impact detection effect on the top and side of the battery pack, further improving the comprehensiveness and accuracy of the battery pack detection. Then, under the downward impact force, the placement rack drives the sliding sleeves on the four connecting arms to slide back and forth on the optical rod, absorbing the downward impact force on the battery pack on the placement rack. Then, the absorbed impact potential energy is released and drives the piston heads on the two T-shaped rods to perform reciprocating work in the two cylinders, converting the downward impact potential energy into the kinetic energy formed by the pressurized gas. Then, the pressurized gas sources generated in the two cylinders are supplied into the four pressurized small tanks for temporary storage through the threaded hoses on the two four-way valves. When the battery pack generates high temperature during impact, the pressurized gas sources temporarily stored in the four pressurized small tanks are supplied into the two cooling covers through the two first three-way joints. The cold sources provided by the two refrigerators are supplied. Then, under the action of the pressurized force, the cold sources supplied into the two cooling covers reach the enclosed space formed by the two protective covers to cool down the battery pack that generates high temperature, so as to prevent the battery pack from burning and scrapping during the impact detection operation and reduce the impact detection cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view of the initial state of the structure of a battery pack impact detection device of the present invention;

[0019] Figure 2A side view of a battery pack impact detection device according to the present invention in a structural transposition state;

[0020] Figure 3 This is a rear view of the battery pack impact detection device structure in an impact state according to the present invention;

[0021] Figure 4 A partial side cross-sectional view of the structure of a battery pack impact detection device according to the present invention;

[0022] Figure 5 A partial bottom view of the initial state of the structure of a battery pack impact detection device of the present invention;

[0023] Figure 6 A partial bottom view of the battery pack impact detection device structure in an impact state according to the present invention;

[0024] Figure 7 It is a rear cross-sectional view of the base frame, side tubes, top frame, rotating assembly, transposition assembly and main inspection assembly structure of the present invention;

[0025] Figure 8 This is a rear view of the initial state of the rotation assembly, transposition assembly and main inspection assembly structure of the present invention;

[0026] Figure 9 This is a rear view of the rotation assembly, transposition assembly and main inspection assembly structure of the present invention in an impact state;

[0027] Figure 10 It is a bottom-view cross-sectional view of the top frame, rotating assembly and transposition assembly structure of the present invention;

[0028] Figure 11 This is a bottom view of the main inspection component structure of the present invention;

[0029] Figure 12 It is a side cross-sectional view of the initial state of the chassis, cylinder, auxiliary inspection assembly and conversion assembly structure of the present invention;

[0030] Figure 13 A side cross-sectional view of the chassis, cylinder, auxiliary inspection assembly, and conversion assembly structure of the present invention in an impact state;

[0031] Figure 14 A bottom view of the auxiliary inspection assembly structure of the present invention;

[0032] Figure 15 This is an exploded view of the auxiliary inspection component structure of the present invention;

[0033] Figure 16 A bottom view of the conversion assembly structure of the present invention in its initial state;

[0034] Figure 17 A top view of the conversion component structure of the present invention in the conversion state;

[0035] Figure 18 Side view of the initial state of the protective cover, conversion component, refrigeration component and fire extinguishing component structures of the present invention;

[0036] Figure 19 Side sectional view of the initial state of the protective cover, cylinder barrel, conversion component, refrigeration component and fire extinguishing component structures of the present invention;

[0037] Figure 20 Side view of the structure of the refrigerator of the present invention;

[0038] Figure 21 Side view of the conversion state of the cylinder barrel, conversion component, refrigeration component and fire extinguishing component structures of the present invention;

[0039] Figure 22 Partial upward sectional view of the cylinder barrel, conversion component and fire extinguishing component structures of the present invention;

[0040] Figure 23 Partial sectional view of the structure of the fire extinguishing component of the present invention;

[0041] Figure 24 Initial state diagram of the protective cover structure of the present invention.

[0042] Description of the markings in the figure: 1, chassis; 2, side cylinder; 3, top frame; 4, cylinder barrel; 51, double-headed motor; 52, first electric push rod; 53, driving circular gear; 54, planetary circular gear; 55, gear ring; 56, sliding seat; 61, first circuit breaker; 62, first electromagnet; 63, first magnet; 64, flat impact head; 65, prism impact head; 66, pointed cone impact head; 71, driving bevel gear; 72, driven bevel gear; 73, second electric push rod; 74, reciprocating lead screw; 75, lead screw sleeve; 76, connecting arm; 81, placement rack; 82, supporting shaft; 83, rocker arm; 84, supporting arm; 85, hinge shaft; 86, lateral impact head; 91, connecting arm; 92, sliding sleeve; 93, smooth rod; 94, T-shaped rod; 95, piston head; 96, return spring; 101, four-way valve; 102, threaded hose; 103, pressurizing small tank; 104, first three-way joint; 105, cold air supply cover; 106, refrigerator; 111, second three-way joint; 112, arc-shaped frame; 113, flow equalizing plate; 114, pressurizing chamber; 115, pressurizing nozzle; 116, small electric control valve; 12, plugging cover plate; 13, annular slide rail; 14, main pressure sensor; 15, strip-shaped chute; 16, second circuit breaker; 17, second electromagnet; 18, second magnet; 19, auxiliary pressure sensor; 20, distance adjusting bolt; 21, universal ball head; 22, buffer spring; 23, double-headed air cylinder; 24, connecting seat; 25, protective cover; 26, guide rail bar; 27, guide rail groove; 28, temperature sensor; 29, smoke sensor; 30, flow equalizing net. Detailed implementation mode

[0043] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments:

[0044] As Figures 1-24 shown, an impact detection device for a battery pack of the present invention includes a chassis 1. A side cylinder 2 with a PLC controller is fixedly connected to the rear side of the chassis 1, and a top frame 3 is fixedly connected to the top of the side cylinder 2. Cylinder barrels 4 are fixedly connected to both sides of the chassis 1. Double-headed cylinders 23 are embedded in both sides of the inner cavity of the chassis 1. Two piston rods of the double-headed cylinder 23 are fixedly connected through a connecting seat 24 to a protective cover 25 that is embedded and matched with a cold supply cover 105. Through the opening and closing adjustment of the two groups of protective covers 25, the battery pack on the chassis 1 is subjected to a closed protection treatment to prevent the fragments ejected during the impact detection of the battery pack, as well as the smoke and open fire from causing harm to the surrounding personnel. A guide rail strip 26 is fixedly connected to the inner side of the protective cover 25, and guide rail grooves 27 that are slidably matched with the guide rail strip 26 are opened on both sides of the chassis 1, which plays a role in sliding support for the protective cover 25 and improves the opening and closing stability of the protective cover 25. A temperature sensor 28 and a smoke sensor 29 are diagonally embedded in the top of the protective cover 25 to monitor the temperature and smoke in the closed space formed in the protective cover 25 in real time, ensuring the safety of the battery pack impact detection site;

[0045] A rotating assembly is provided inside the top frame 3, and the rotating assembly includes a double-headed motor 51 fixed between the side cylinder 2 and the top frame 3. A transposition assembly is provided on the top frame 3 and is used in conjunction with the rotating assembly to perform electromagnetic positioning and restriction release on the flat impact head 64, the prism impact head 65, and the cone impact head 66, achieving an effective transposition effect of impact heads of different shapes without manual replacement, providing convenience for subsequent impact detection work of the battery pack; A main inspection assembly is provided inside the side cylinder 2 and is used in conjunction with the transposition assembly. The main inspection assembly includes a driving bevel gear 71 fixed on one output shaft of the double-headed motor 51, and sequentially performs single-press impact or reciprocating press impact movement on the battery pack on the placement rack 81 to obtain the bearing condition of the battery pack under the action of impact forces of different shapes, making the test results more comprehensive and accurate. Auxiliary inspection assemblies are provided on both sides of the bottom frame 1 and are linked and coordinated with the main inspection assembly. Four rocker arms 83 drive four groups of side impact heads 86 to perform single or reciprocating knocking on the side of the battery pack following the downward pressing of the flat impact head 64, the prism impact head 65, or the cone impact head 66, achieving a synchronous impact detection effect on the top and side of the battery pack, further improving the comprehensiveness and accuracy of the battery pack detection; A conversion assembly is provided inside the bottom frame 1 and is used in conjunction with the cylinder 4. The conversion assembly includes smooth rods 93 fixed on both sides of the inner cavity of the bottom frame 1, which converts the downward pressing impact potential energy into the kinetic energy formed by pressurized gas, providing convenience for subsequent on-site refrigeration and dry powder fire extinguishing, reducing the input cost of power equipment. A refrigeration assembly is provided on the outside of the cylinder 4 and is temperature-controlled with the bottom frame 1 to cool down the battery pack that generates high temperature, preventing the battery pack from burning out during the impact detection operation, and reducing the impact detection cost of the battery pack.

[0046] Such as Figures 7-21As shown, the rotating assembly further includes a first electric push rod 52 embedded in the other output shaft of the double-headed motor 51, and the piston rod of the first electric push rod 52 is fixedly connected to a driving circular gear 53. Planetary circular gears 54 that cooperate with the driving circular gear 53 are rotatably connected to the four surrounding sides of the inner cavity of the top frame 3. The first electric push rod 52 adjusts the meshing stroke of the driving circular gear 53 and the three groups of planetary circular gears 54. A toothed ring 55 is meshed with the outer side of the planetary circular gear 54. The double-headed motor 51 drives the toothed ring 55 to perform linear rotation through the engaged driving circular gear 53 and the three groups of planetary circular gears 54. Sliding seats 56 that are slidably matched with the top frame 3 are fixedly connected to the four surrounding sides of the toothed ring 55; the position-changing assembly includes a first circuit breaker 61 fixed to one side of the sliding seat 56, and a first electromagnet 62 that is fixedly connected to the outer side of the sliding seat 56 and is used in cooperation with the first circuit breaker 61. A first magnet 63 is adsorbed on the outer side of the first electromagnet 62. A flat impact head 64, a prism impact head 65, and a pointed cone impact head 66 are respectively fixedly connected to the outer side of the first magnet 63 and are distributed at equal triangular distances along the transverse axis of the top frame 3. The toothed ring 55 drives the flat impact head 64, the prism impact head 65, and the pointed cone impact head 66 to perform orderly rotation and position change through the three groups of sliding seats 56. Then, the three groups of first circuit breakers 61, first electromagnets 62, and first magnets 63 perform electromagnetic positioning and restriction release on the flat impact head 64, the prism impact head 65, and the pointed cone impact head 66, achieving an effective position-changing effect of different-shaped impact heads without manual replacement, providing convenience for the subsequent impact detection work of the battery pack; annular sliding rails 13 that are slidably matched with the sliding seats 56 are opened on both sides of the top frame 3, which play a role in rotatably supporting the sliding seats 56 and improving the rotational stability of the sliding seats 56 to prevent the flat impact head 64, the prism impact head 65, and the pointed cone impact head 66 from shaking. A main pressure sensor 14 is embedded in the flat impact head 64. A strip-shaped sliding groove 15 that is slidably matched with the connecting arm 76 is opened on the front side of the side cylinder 2, which plays a role in slidingly limiting the connecting arm 76 and ensuring the stability of the connecting arm 76 during lifting and lowering.

[0047] The main inspection component also includes a second electric push rod 73 that rotates on the top of the side cylinder 2, and the piston rod of the second electric push rod 73 is fixedly connected to the driven bevel gear 72 used in conjunction with the driving bevel gear 71. The meshing stroke of the driven bevel gear 72 and the driving bevel gear 71 is adjusted by the second electric push rod 73. The bottom of the second electric push rod 73 is fixedly connected to a reciprocating screw rod 74 that rotates with the side cylinder 2. The reciprocating screw rod 74 is driven to rotate by the double-headed motor 51 through the driving bevel gear 71 and the driven bevel gear 72 that are meshed in place; and a screw rod sleeve 75 is threadedly connected to the reciprocating screw rod 74, and the front side of the screw rod sleeve 75 is fixedly connected to a connecting arm 76. The reciprocating screw rod 74 drives the connecting arm 76 through the screw rod sleeve 75 to perform a single downward pressure or reciprocating lift The descending downward pressure action is carried out in conjunction with the second circuit breaker 16, the second electromagnet 17 and the second attracting magnet 18 to electromagnetically position the ordered flat impact head 64, the prismatic impact head 65 and the conical impact head 66 and the connecting arm 76, and then the connecting arm 76 drives the flat impact head 64, the prismatic impact head 65 or the conical impact head 66 to perform a single downward pressure impact or a reciprocating downward pressure impact movement on the battery pack on the placement rack 81 in an orderly manner, so as to obtain the battery pack's bearing condition under the action of impact forces of different shapes, so as to make the detection result more comprehensive and accurate; the connecting arm 76 is fixedly connected to the second circuit breaker 16, and the front side of the connecting arm 76 is fixedly connected to the second electromagnet 17, and the second electromagnet 17 is powered on and off by the second circuit breaker 16, so that the second electromagnet The iron 17 carries electromagnetic force when it is energized and loses the electromagnetic force when it is de-energized. The rear sides of the flat impact head 64, the prismatic impact head 65 and the pointed cone impact head 66 are fixedly connected with a second attracting magnet 18 used in conjunction with the second electromagnet 17. The flat impact head 64, the prismatic impact head 65 and the pointed cone impact head 66 are then adsorbed and positioned by the second attracting magnet 18. The auxiliary inspection component includes a placement rack 81 that slides in the base frame 1, and a limiting slot is provided on the placement rack 81. Both sides of the base frame 1 are fixedly connected with a supporting shaft 82, and both sides of the supporting shaft 82 are hinged with a rocker arm 83 used in conjunction with the base frame 1. Both sides of the placement rack 81 are hinged with a support arm 84. When the battery pack is hit by the flat impact head 64, the prismatic impact head 65 or the pointed cone impact head 6 6 Under the action of the downward impact force, the two groups of supporting shafts 82 first provide hinged support for the four rocker arms 83, and then the placement frame 81 drives the four support arms 84 to perform outward and inward movement, and the end of the support arm 84 is fixedly connected to the hinge shaft 85 hinged with the rocker arm 83. The top of the rocker arm 83 is provided with a lateral impact head 86, and the four support arms 84 drive the four rocker arms 83 to move back and forth outward and inward through the hinge shaft 85. Then, the four rocker arms 83 drive the four groups of lateral impact heads 86 to follow the flat impact head 64, the prismatic impact head 65 or the conical impact head 66 to press down on the side of the battery pack to perform a single or reciprocating knock, thereby achieving a synchronous impact detection effect on the top and side of the battery pack, further improving the comprehensiveness and accuracy of the battery pack detection.

[0048] The conversion component further includes connecting arms 91 hinged to both sides of the bottom of the placement rack 81, and sliding sleeves 92 hinged to the ends of the connecting arms 91 and slidingly engaged with the optical rods 93. Under the action of the downward impact force, the placement rack 81 drives the sliding sleeves 92 on the four connecting arms 91 to slide back and forth on the optical rods 93, so as to absorb the downward impact force on the battery pack on the placement rack 81. A T-shaped rod 94 fixedly connected to the inner side of the sliding sleeve 92 and slidingly engaged with the chassis 1 and the cylinder barrel 4 is provided, and a piston head 95 slidingly engaged with the cylinder barrel 4 is fixedly connected to the outer side of the T-shaped rod 94. A return spring 96 fixedly fitted with the chassis 1 is sleeved on the T-shaped rod 94, and then the absorbed impact potential energy is released to drive the piston heads 95 on the two T-shaped rods 94 to perform reciprocating work in the two groups of cylinder barrels 4, so as to convert the downward impact potential energy into the kinetic energy formed by the pressurized gas; an auxiliary pressure sensor 19 is embedded in the inner side of the lateral impact head 86 to detect the pressure of the lateral impact head 86 hitting the battery pack, and an adjusting bolt 20 is threadedly connected to the top of the rocker arm 83 to adjust the knocking distance of the lateral impact head 86 to meet the knocking detection requirements of battery packs of different specifications and sizes. A universal ball head 21 hingedly engaged with the lateral impact head 86 is arranged inside the adjusting bolt 20 to adaptively adjust the knocking angle of the lateral impact head 86, so that the lateral impact head 86 effectively hits the side of the battery pack. Buffer springs 22 fixedly fitted with the sliding sleeves 92 are sleeved on both sides of the optical rod 93 to elastically buffer and assist in resetting and compensating the sliding stroke of the sliding sleeves 92; the refrigeration component includes a four-way valve 101 connected to the outside of the cylinder barrel 4 and provided with a pressure sensor, and threaded hoses 102 are connected to both ends of the four-way valve 101. The top ends of the threaded hoses 102 are connected to a pressurization small tank 103. The pressurized gas sources generated in the two groups of cylinder barrels 4 are supplied into the four groups of pressurization small tanks 103 for temporary storage through the threaded hoses 102 on the two groups of four-way valves 101. The outer end of the pressurization small tank 103 is connected to a first three-way joint 104, and the inner end of the first three-way joint 104 is connected to a cold air supply cover 105. A flow equalizing mesh 30 is embedded in the inner side of the cold air supply cover 105 to equalize the cold source supplied by the cold air supply cover 105. After the battery pack generates high temperature during impact, the pressurized gas sources temporarily stored in the four groups of pressurization small tanks 103 are supplied into the two groups of cold air supply covers 105 through the two first three-way joints 104. Refrigerators 106 with refrigeration fins are embedded on both sides of the cold air supply cover 105. Cold sources are provided by the two groups of refrigerators 106. Then, the cold sources supplied into the two groups of cold air supply covers 105 reach the enclosed space formed by the two groups of protective covers 25 under the action of the pressurization force, so as to cool down the battery pack generating high temperature, so as to prevent the battery pack from burning out during the impact detection operation and reduce the impact detection cost of the battery pack.

[0049] Such as Figures 21-24As shown, during the impact detection of the battery pack, the battery pack is hit by the impact head, causing the internal components to collide and generate high temperatures, and then it is prone to open flame combustion. Most of the time, the inspectors get fire extinguishers from other places to extinguish the fire on the spot, which prolongs the fire extinguishing time and has low safety. It does not have an automatic dry powder fire extinguishing function. A fire extinguishing component is provided on the refrigeration component, and the fire extinguishing component includes a second three-way joint 111 connected to the top of the pressurizing small tank 103. The bottom end of the second three-way joint 111 is connected to an arc-shaped frame 112 that is fitted with the protective cover 25 in an embedded manner. A flow equalizing plate 113 is embedded between the second three-way joint 111 and the arc-shaped frame 112. The pressurized air sources temporarily stored in the four pressurizing small tanks 103 are controlled to be evenly distributed by two second three-way joints 111 through the flow equalizing plate 113. A pressurizing chamber 114 for mixing dry powder fire extinguishing agent and pressurized air source is provided in the inner cavity of the arc-shaped frame 112. The pressurized air source is then supplied into the pressurizing chambers 114 of the two arc-shaped frames 112 to be pressurized and mixed with the dry powder fire extinguishers added in advance. The arc-shaped frame 112 is array-connected with pressurizing nozzles 115 that are connected and matched with the pressurizing chamber 114 on the side close to the battery pack. A small electric control valve 116 is provided on the pressurizing nozzle 115. By controlling the synchronous opening of the small electric control valves 116 on the array-distributed pressurizing nozzles 115, the pressurized dry powder fire extinguishing agent in the pressurizing chamber 114 is sprayed comprehensively towards the battery pack area through the array-distributed pressurizing nozzles 115 to suppress the unburned area and extinguish the burning flames. A sealing cover plate 12 is fixed by bolts at the dry powder fire extinguishing agent feeding port of the arc-shaped frame 112, which is convenient for timely adding the dry powder fire extinguishing agent required for fire extinguishing into the pressurizing chambers 114 of the two arc-shaped frames 112.

[0050] A method for detecting the impact of a battery pack, the operation steps are as follows: Step 1. First, place the battery pack to be detected in the limit groove on the placement rack 81 for positioning, then control the first electric push rod 52 to start and drive the driving circular gear 53 to move forward and engage with the meshing parts of the three planetary circular gears 54. Then control the double-headed motor 51 to start and drive the three engaged planetary circular gears 54 to rotate through the driving circular gear 53 on the first electric push rod 52. The three planetary circular gears 54 drive the toothed ring 55 to rotate linearly. The toothed ring 55 drives the flat impact head 64, the prism impact head 65 and the cone impact head 66 to rotate linearly through the three sliding seats 56. After the flat impact head 64, the prism impact head 65 and the cone impact head 66 to be used are sequentially transposed to the connection position of the connecting arm 76 and stopped, first control the second circuit breaker 16 on the connecting arm 76 to start and energize the second electromagnet 17. The second electromagnet 17 carrying electromagnetic force sequentially performs electromagnetic adsorption positioning on the flat impact head 64, the prism impact head 65 and the cone impact head 66 that are sequentially transposed. And correspondingly control the first circuit breaker 61 on the flat impact head 64, the prism impact head 65 and the cone impact head 66 to start and cut off the power supply of the first electromagnet 62, so that the first electromagnet 62 loses electromagnetic force and releases the adsorption force of the first magnet 63, and the transposition connection and fixation work between the flat impact head 64, the prism impact head 65 and the cone impact head 66 and the connecting arm 76 can be sequentially completed. After the transposition work of the three impact heads is completed, first control the double-headed motor 51 to pause, and then control the first electric push rod 52 to close and drive the driving circular gear 53 to move backward and disengage from the meshing parts of the three planetary circular gears 54 to the initial position;

[0051] Step 2. Before that, first control the two double-headed cylinders 23 to open and synchronously move the two groups of protective covers 25 inward through the two groups of connecting seats 24 to seal and protect the chassis 1 and the battery packs on the placement rack 81. After the connecting arm 76 sequentially and orderly replaces and fixes the flat impact head 64, the prism impact head 65, and the cone impact head 66, first control the second electric push rod 73 to open and drive the driven bevel gear 72 to move upward and engage with the meshing part of the driving bevel gear 71. Then control the double-headed motor 51 to start and drive the driven bevel gear 72 to rotate through the engaged driving bevel gear 71. The driven bevel gear 72 drives the connecting arm 76 on the lead screw sleeve 75 to move downward through the reciprocating lead screw 74. The connecting arm 76 sequentially drives the flat impact head 64, the prism impact head 65, and the cone impact head 66 after being connected and fixed to move downward to perform a single downward impact on the battery pack in the limiting groove on the placement rack 81, or perform a reciprocating downward impact on the battery pack, so as to obtain the impact conditions of the flat impact head 64, the prism impact head 65, and the cone impact head 66 with different impact surfaces on the battery pack. At the same time, under the action of the downward impact force of the flat impact head 64, the prism impact head 65, and the cone impact head 66 on the battery pack, the placement rack 81 is forced to drive the four support arms 84 to drive the hinge shaft 85 to move downward and expand outward. With the supporting and rotating cooperation of the two supporting shafts 82 for the four rocker arms 83, according to the shape structure of the four rocker arms 83, the four outward-expanded support arms 84 drive the four groups of lateral impact heads 86 at the tops of the four rocker arms 83 to move inward synchronously. And the distance between the four groups of lateral impact heads 86 is adjusted in advance through the universal ball heads 21 on the four distance-adjusting bolts 20. Then the four groups of lateral impact heads 86 follow and strike the side of the battery pack. By means of the downward impact force of the battery pack, the top and side of the battery pack can be synchronously impacted and detected;

[0052] Step 3. At the same time, the downward impact force on the battery pack also forces the four connecting arms 91 to extend outward synchronously. The four connecting arms 91 drive the four sets of sliding sleeves 92 to slide outward synchronously on the two light rods 93 and squeeze the four buffer springs 22 back and forth. When the battery pack loses the downward impact force of the flat impact head 64, the prismatic impact head 65 or the conical impact head 66, the battery pack on the placement rack 81 is driven to move upward by the four sets of sliding sleeves 92 and the connecting arms 91 under the elastic restoring force of the four buffer springs 22. At this time, the placement rack 81, which has lost the downward impact force and is in an upward state, passes through The four support arms 84 drive the four rocker arms 83 to reset, and drive the four groups of lateral impact heads 86 to separate from the side of the battery pack, preparing for the next knocking action. At this time, under the elastic reset cooperation of the two reset springs 96 on the piston heads 95 on the two T-shaped rods 94, the four groups of sliding sleeves 92 sliding back and forth also drive the two groups of piston heads 95 through the two T-shaped rods 94 to reciprocate in the two groups of cylinders 4 to perform work and generate a pressurized air source, converting the downward impact potential energy generated on the placement rack 81 into the pressurized kinetic energy formed by the pressurized gas. The pressurized air source generated in the two groups of cylinders 4 passes through the two groups of four-way valves 10 1 is supplied to the four groups of booster tanks 103 for temporary storage. When the two groups of temperature sensors 28 detect that the temperature in the closed space formed by the two groups of protective covers 25 is high, it means that the battery pack is damaged and generates high temperature, which is on the verge of combustion. The battery pack needs to be cooled and flame-retarded. At this time, the boosted gas source temporarily stored in the four groups of booster tanks 103 is controlled to be supplied to the two groups of cold-feeding covers 105 through the two first three-way connectors 104, and the two groups of refrigerators 106 are controlled to open in advance and supply cold source to the two groups of cold-feeding covers 105. Under the pressure of the two boosted gas sources, The cold source in the two sets of cold supply covers 105 is evenly distributed through the two sets of equalizing nets 30 and pressurized to be supplied to the closed space formed by the two sets of protective covers 25, so as to cool down and flame retard the battery pack in the impact or non-impact state. After the impact detection work is completed, the double-headed motor 51 is first controlled to be closed, and then the second electric push rod 73 is controlled to be closed and drive the driven bevel gear 72 to move downward and disengage from the meshing part of the driving bevel gear 71 to the initial position. Conversely, the two sets of protective covers 25 are extended and reset by the two double-headed cylinders 23, and the battery pack after the impact detection is taken out to prepare for the impact work of the next set of battery packs.

[0053] Step 4. If the smoke sensor 29 detects that the smoke in the enclosed space formed by the two sets of protective covers 25 is large, it indicates that the battery pack has been severely damaged at this time and an open fire has occurred locally or overall. Immediately control the pressurized gas temporarily stored in the four sets of pressurized small tanks 103 to be evenly distributed by the two second three-way joints 111 through the flow equalizing plate 113, and then supply it into the pressurizing chambers 114 of the two arc-shaped frames 112 to be pressurized and mixed with the dry powder fire extinguishers added in advance. At the same time, control the synchronous opening of the small electric control valves 116 on the array-distributed pressurizing nozzles 115. Then, the pressurized dry powder fire extinguishing agent in the pressurizing chambers 114 is sprayed comprehensively towards the battery pack area through the array-distributed pressurizing nozzles 115 to suppress the unburned area and extinguish the burning flames. It should be noted that the dry powder fire extinguishing agent required for fire extinguishing should be regularly added to the pressurizing chambers 114 of the two arc-shaped frames 112 through the plugging cover plate 12.

Claims

1. A battery pack impact detection device, comprising a chassis (1), characterized in that: A side cylinder (2) with a PLC controller is fixedly connected to the rear side of the chassis (1), and a top frame (3) is fixedly connected to the top of the side cylinder (2). Cylinder barrels (4) are fixedly connected to both sides of the chassis (1). A rotating assembly is arranged inside the top frame (3), and the rotating assembly includes a double-headed motor (51) fixed between the side cylinder (2) and the top frame (3). A position-changing assembly used in cooperation with the rotating assembly is arranged on the top frame (3). A main inspection assembly used in cooperation with the position-changing assembly is arranged inside the side cylinder (2), and the main inspection assembly includes a driving bevel gear (71) fixed on an output shaft of the double-headed motor (51). Auxiliary inspection assemblies in linkage cooperation with the main inspection assembly are arranged on both sides of the chassis (1). A conversion assembly used in cooperation with the cylinder barrels (4) is arranged inside the chassis (1), and the conversion assembly includes smooth rods (93) fixed on both sides of the inner cavity of the chassis (1). A refrigeration assembly for temperature control cooperation with the chassis (1) is arranged on the outer side of the cylinder barrels (4).

2. The impact detection device for a battery pack according to claim 1, wherein: The rotating assembly further includes a first electric push rod (52) embedded in the other output shaft of the double-headed motor (51), and a driving circular gear (53) is fixedly connected to the piston rod of the first electric push rod (52). Planetary circular gears (54) used in cooperation with the driving circular gear (53) are rotatably connected to the periphery of the inner cavity of the top frame (3), and a toothed ring (55) is meshed with the outer side of the planetary circular gears (54). Sliding seats (56) slidably matched with the top frame (3) are fixedly connected to the periphery of the toothed ring (55).

3. The impact detection device for a battery pack according to claim 2, wherein: The position-changing assembly includes a first circuit breaker (61) fixed on one side of the sliding seat (56), and a first electromagnet (62) used in cooperation with the first circuit breaker (61) is fixedly connected to the outer side of the sliding seat (56). A first magnetic absorber (63) is adsorbed on the outer side of the first electromagnet (62), and a flat impact head (64), a prism impact head (65), and a pointed cone impact head (66) are respectively fixedly connected to the outer side of the first magnetic absorber (63) and are distributed at equal triangular intervals along the transverse axis of the top frame (3).

4. The impact detection device for a battery pack according to claim 3, wherein: The main inspection assembly further includes a second electric push rod (73) rotatably arranged on the top of the side cylinder (2), and a driven bevel gear (72) used in cooperation with the driving bevel gear (71) is fixedly connected to the piston rod of the second electric push rod (73). A reciprocating lead screw (74) rotatably matched with the side cylinder (2) is fixedly connected to the bottom of the second electric push rod (73), and a lead screw sleeve (75) is threadedly connected to the reciprocating lead screw (74). A connecting arm (76) is fixedly connected to the front side of the lead screw sleeve (75).

5. The impact detection device for a battery pack according to claim 4, wherein: The auxiliary inspection component includes a placement rack (81) slidably arranged in the chassis (1), and a limiting groove is formed in the placement rack (81). Both sides of the chassis (1) are fixedly connected with supporting shafts (82), and both sides of each supporting shaft (82) are hinged with a rocker arm (83) used in cooperation with the chassis (1). Both sides of the placement rack (81) are hinged with support arms (84), and the ends of the support arms (84) are fixedly connected with hinge shafts (85) hinged in cooperation with the rocker arms (83). A lateral impact head (86) is arranged at the top of the rocker arm (83).

6. The impact detection device for a battery pack according to claim 5, wherein: The conversion component further includes connecting arms (91) hinged to both sides of the bottom of the placement rack (81), and the ends of the connecting arms (91) are hinged with sliding sleeves (92) slidably matched with a smooth rod (93). A T-shaped rod (94) slidably matched with the chassis (1) and the cylinder barrel (4) is fixedly connected to the inner side of the sliding sleeve (92), and a piston head (95) slidably matched with the cylinder barrel (4) is fixedly connected to the outer side of the T-shaped rod (94). A return spring (96) fixedly matched with the chassis (1) is sleeved on the T-shaped rod (94).

7. The impact detection device for a battery pack according to claim 6, wherein: The refrigeration component includes a four-way valve (101) communicated with the outside of the cylinder barrel (4) and is provided with a pressure sensor. Both ends of the four-way valve (101) are communicated with threaded hoses (102). The top ends of the threaded hoses (102) are communicated with a pressurizing small tank (103), and the outer ends of the pressurizing small tank (103) are communicated with a first three-way joint (104). The inner end of the first three-way joint (104) is communicated with a cold delivery cover (105), and refrigerators (106) with refrigeration fins are embedded on both sides of the cold delivery cover (105).

8. The impact detection device for a battery pack according to claim 7, wherein: Circular sliding rails (13) slidably matched with the sliding seats (56) are formed on both sides of the top frame (3), and a main pressure sensor (14) is embedded on the flat impact head (64). A strip-shaped sliding groove (15) slidably matched with the connecting arm (76) is formed on the front side of the side cylinder (2), and a second circuit breaker (16) is fixedly connected to the connecting arm (76). A second electromagnet (17) is fixedly connected to the front side of the connecting arm (76), and second magnets (18) used in cooperation with the second electromagnet (17) are fixedly connected to the rear sides of the flat impact head (64), the prism impact head (65), and the cone impact head (66).

9. The impact detection device for a battery pack according to claim 8, wherein: A secondary pressure sensor (19) is embedded inside the lateral impact head (86), and an adjusting bolt (20) is threadedly connected to the top of the rocker arm (83). A universal ball head (21) that is hinged to the lateral impact head (86) is arranged inside the adjusting bolt (20). Buffer springs (22) that are fixedly fitted with the sliding sleeve (92) are sleeved on both sides of the smooth rod (93). Double-headed cylinders (23) are embedded on both sides inside the chassis (1), and two piston rods of the double-headed cylinders (23) are fixedly connected through a connecting seat (24) to a protective cover (25) that is fitted with the cold air supply cover (105). A guide rail strip (26) is fixedly connected inside the protective cover (25), and guide rail grooves (27) that are slidably fitted with the guide rail strip (26) are formed on both sides of the chassis (1). A temperature sensor (28) and a smoke sensor (29) are diagonally embedded on the top of the protective cover (25), and a flow equalizing net (30) is embedded inside the cold air supply cover (105).

10. A method for detecting the impact of a battery pack, according to the battery pack impact detection device according to any one of the above claims 1-9, characterized in that: It includes the following steps: Step 1: First, place the battery pack to be detected on the placement rack (81), then control the first electric push rod (52) to start and drive the driving circular gear (53) to move forward and engage with the meshing parts of the three planetary circular gears (54). Then control the double-headed motor (51) to start and drive the three planetary circular gears (54) to rotate through the driving circular gear (53), thereby driving the ring gear (55) to linearly rotate. The ring gear (55) drives the flat impact head (64), the prism impact head (65), and the cone impact head (66) to linearly rotate through the three sliding seats (56) until they stop at the connection position. Then, the connecting arm (76) orderly connects and positions the flat impact head (64), the prism impact head (65), and the cone impact head (66) that have been replaced in position; Step 2: First, control the second electric push rod (73) to start and drive the driven bevel gear (72) to move upward and engage with the driving bevel gear (71). Then control the double-headed motor (51) to start and drive the connecting arm (76) on the lead screw sleeve (75) to move downward through the driving bevel gear (71) and the driven bevel gear (72) by means of the reciprocating lead screw (74). The connecting arm (76) orderly drives the flat impact head (64), the prism impact head (65), and the cone impact head (66) that have been connected and fixed to move downward to perform a single downward impact and a reciprocating downward impact on the battery pack in the limiting groove on the placement rack (81), obtaining the impact conditions of different shaped bodies. Meanwhile, under the action of the downward impact force received by the battery pack, the two supporting shafts (82) support and rotate the four rocker arms (83), forcing the placement rack (81) to drive the four support arms (84) to drive the four lateral impact heads (86) at the tops of the four rocker arms (83) to synchronously move inward through the hinge shaft (85), and then the four lateral impact heads (86) follow and strike the side of the battery pack; Step 3. At the same time, the downward impact force on the battery pack also forces the four connecting arms (91) to expand outward synchronously. The four connecting arms (91) drive the four sets of sliding sleeves (92) to slide outward synchronously on the two optical rods (93). The four sets of sliding sleeves (92) sliding back and forth also drive the two sets of piston heads (95) to reciprocate in the two sets of cylinder barrels (4) through the two T-shaped rods (94) and generate a pressurized gas source, converting the downward impact potential energy generated on the placement rack (81) into the pressurized kinetic energy formed by the pressurized gas. Then, the pressurized gas source generated in the two sets of cylinder barrels (4) is supplied into the four sets of pressurized small tanks (103) for temporary storage through the threaded hoses (102) on the two sets of four-way valves (101). When the two temperature sensors (28) detect that the on-site temperature is relatively high, it is controlled that the pressurized gas source temporarily stored in the four sets of pressurized small tanks (103) is supplied into the two sets of cold air supply covers (105) through the two first three-way connectors (104), and the two sets of refrigerators (106) are controlled in advance to start and supply cold sources into the two sets of cold air supply covers (105), and the cold sources are supplied into the closed space formed by the two sets of protective covers (25) through the two sets of cold air supply covers (105) to cool and prevent the battery pack from catching fire in both the impact and non-impact states until all the impact detection work is completed.

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