An optimization design method of a battery pack protection structure and the battery pack protection structure

Abstract

The application relates to the technical field of batteries, in particular to a battery pack protection structure optimization design method and the battery pack protection structure, which comprises the following steps: determining the position of a power line based on a battery management system (PCB) board in a battery pack; after the position of the power line is determined, the rated current of the power line is measured by using a universal meter; based on the rated current, a fuse link blank with a fuse current of 3 times the rated current is selected; and the fuse link blank is punched by using a punch press to obtain a fuse link with a fuse current of 1.5-2.5 times the rated current. The method selects the fuse link blank with the fuse current of 3 times the rated current for punching, leaves a processing allowance for the punching of the fuse link blank, avoids the phenomenon that the rated current is excessively reduced after one-time punching, and obtains the fuse link with a simple structure and fast response speed.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an optimized design method for a battery pack protection structure and the battery pack protection structure thereof. Background Technology

[0002] The battery management system (BMS) of a battery pack is used to monitor parameters such as voltage, current, and temperature of the batteries, as well as status information such as SOC (State of Charge) and SOH (State of Health). It can also manage the balancing of multiple battery components in the battery pack. It has charge and discharge protection functions and can alarm and diagnose battery pack faults. Therefore, it is an extremely important electronic component in the battery pack. In the present technology, protective structures are often set on the power lines of its circuit board to protect the safety of the entire system.

[0003] However, existing technologies still have serious shortcomings. For example, a battery fuse with patent number CN202420044576.7 includes a housing assembly, a terminal assembly, and a fusible element assembly. The housing assembly includes an upper housing and a lower housing, which are connected to each other to form an accommodating space filled with filler for arc extinguishing. The terminal assembly includes a first terminal and a second terminal, which are made of two or more composite metal materials. The first terminal is located on one side of the housing assembly, with one end extending into the accommodating space and fixed to the housing assembly, and the other end used to connect to the battery tab. The second terminal is located on the other side of the housing assembly, with one end extending into the accommodating space and fixed to the housing assembly, and the other end used to connect to the battery tab. This device has an overly complex structure and extremely low practicality. Summary of the Invention

[0004] This invention provides an optimized design method for a battery pack protection structure and the battery pack protection structure itself, in order to address the issues raised in the background art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: an optimized design method for a battery pack protection structure, comprising the following steps:

[0006] The location of the power lines is determined based on the PCB board of the battery management system within the battery pack.

[0007] After determining the location of the power cord, use a multimeter to measure its rated current;

[0008] Select fuse blanks with a fusing current three times the rated current based on the rated current;

[0009] The fuse link blank is punched by a punch press to obtain a fuse link with a fuse current of 1.5-2.5 times of the rated current.

[0010] Preferably, the material of the fuse link blank is lead-antimony alloy or zinc alloy or copper alloy.

[0011] Preferably, the rated current is measured by using a multimeter to measure the working power line for three times and taking the average value.

[0012] Preferably, the hole structure is obtained by punching the fuse link blank by a punch press, the hole structure reduces the volume of the fuse link blank, and thus reduces the resistance value of the fuse link blank.

[0013] Preferably, the battery pack protection structure is suitable for the optimization design method of the battery pack protection structure, and comprises a fuse link and a hole structure, and the hole structure is arranged on the fuse link.

[0014] Preferably, the hole structure is arranged through the middle part of the fuse link.

[0015] Preferably, the two ends of the fuse link are respectively connected with the top of an electrically-conductive sheet, the bottom of the electrically-conductive sheet is connected with a pin, and the pin is plated with a tin or silver or nickel or gold protective layer.

[0016] Preferably, a round corner is arranged between the end of the fuse link and the top of the electrically-conductive sheet.

[0017] Preferably, the two sides of each electrically-conductive sheet are respectively connected with the end of a lug.

[0018] Preferably, the lug is arranged in the middle part of the electrically-conductive sheet.

[0019] The beneficial effects of the present application are as follows:

[0020] In the scheme of the present application:

[0021] The method leaves a processing allowance for the punching of the fuse link blank by selecting a fuse link blank with a fuse current of 3 times of the rated current, avoids the phenomenon that the rated current is excessively reduced after one-time punching, and obtains a fuse link with simple structure and fast response speed. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The flowchart of the present application;

[0023] Figure 2 The structure diagram of the fuse link of the present application;

[0024] Figure 3 The connection relationship diagram of the electrically-conductive sheet and the lug of the present application;

[0025] Figure 4This is a structural diagram of the main body of the stamping press of the present invention;

[0026] Figure 5 This is a cross-sectional view of the stamping machine of the present invention;

[0027] Figure 6 This is a schematic diagram of the meshing connection between the gear and rack of the present invention;

[0028] Figure 7 This is a schematic diagram showing the rotatable connection between the guide wheel and the stamping rod of the present invention;

[0029] Figure 8 This is a schematic diagram showing the location of the pressure chamber in this invention;

[0030] Figure 9 This is a schematic diagram showing the positioning and rotational connection relationship of the two rotating shafts in this invention;

[0031] Figure 10 This is a schematic diagram showing the sliding connection between the vibration block and the fan blade in this invention;

[0032] Figure 11 This is a schematic diagram of the ratchet ring and ratchet meshing connection of the present invention.

[0033] The components include: mounting platform 1, bottom mold 2, drive assembly 3, stamping assembly 4, motor 5, spline shaft 6, spline sleeve 7, eccentric wheel 8, guide wheel 9, rotating shaft 10, gear 11, nut 12, rack 13, stamping rod 14, mounting plate 15, spring 16, guide plate 17, mounting tube 18, piston 19, positioning plate 20, pressure chamber 21, rotating shaft 22, blade 23, liquid inlet pipe 24, liquid outlet pipe 25, fan blade 26, air inlet pipe 27, vibrating block 28, spring 29, ratchet ring 30, ratchet 31, fuse 40, hole structure 41, conductive sheet 42, pin 43, rounded corner 44, and protrusion 45. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] Example 1: Reference Figures 1-11 An optimized design method for a battery pack protection structure and the battery pack protection structure, comprising the following steps:

[0036] The location of the power lines is determined based on the PCB board of the battery management system within the battery pack.

[0037] After determining the location of the power cord, use a multimeter to measure its rated current;

[0038] Select fuse blanks with a fusing current three times the rated current based on the rated current;

[0039] The fuse link blank is punched by a punch press to obtain the fuse link 40 with a fuse current of 1.5-2.5 times of the rated current.

[0040] The principle and beneficial effects of the above scheme are:

[0041] First, the battery management system PCB board in the battery pack is found, the position of the power line is accurately determined, the rated current of the power line is quickly determined by using the ammeter shell, then a fuse link blank with a fuse current of 3 times of the rated current is selected, then the fuse link blank is punched by a punch press, the punching reduces the volume of the fuse link blank, reduces its resistance value, and thus realizes the reduction of the rated current, and after punching, the fuse link 40 with a fuse current of 1.5-2.5 times of the rated current is obtained, and the precise design of the fuse link 40 is completed; the reason for selecting the fuse link 40 with a fuse current of 1.5-2.5 times of the rated current is that the battery management system PCB board itself belongs to a control circuit, the current is small, and it needs to work for a long time, so this selection can improve the response speed of the fuse link 40 when the circuit fails, and at the same time will not affect the normal operation of the circuit;

[0042] The method selects a fuse link blank with a fuse current of 3 times of the rated current for punching, leaving a processing allowance for the punching of the fuse link blank, avoiding the phenomenon that the rated current is reduced too much after one-time punching, and obtaining the fuse link 40 with simple structure and fast response speed.

[0043] Embodiment two: refer to Figures 1-11 The material of the fuse link blank is lead-antimony alloy or zinc alloy or copper alloy.

[0044] The principle and beneficial effects of the above scheme are:

[0045] The fuse link blank is made of lead-antimony alloy or zinc alloy or copper alloy, the above three alloys are easy to obtain, and the strength of the fuse link blank can be adjusted according to the actual situation by adjusting the proportion of lead and antimony, or the zinc content or the copper content, greatly reducing the difficulty of blank manufacturing.

[0046] Embodiment three: refer to Figures 1-11 When the rated current is measured by using the multimeter, the power line under work is measured three times and the average value is taken.

[0047] The principle and beneficial effects of the above scheme are:

[0048] The rated current is obtained by using the multimeter, which reduces the difficulty of measurement, and in addition, the measurement result is improved by taking the average value of three measurements.

[0049] Embodiment four: refer to Figures 1-11The punching structure 41 is punched on the fuse link blank by a punch, the punching structure 41 reduces the volume of the fuse link blank, and further reduces the resistance value of the fuse link blank.

[0050] The principle and beneficial effects of the above scheme are:

[0051] The punching structure 41 not only reduces the volume of the blank, but also reduces the cross-sectional area, and further accurately reduces the resistance value of the blank, reducing the difficulty of adjusting the resistance value.

[0052] Embodiment five: refer to Figures 1-11 A battery pack protection structure suitable for the optimization design method of any one of the above battery pack protection structures, comprising: a fuse link 40 and a hole structure 41, the hole structure 41 is opened on the fuse link 40.

[0053] The principle and beneficial effects of the above scheme are:

[0054] The hole structure 41 punched on the fuse link 40 can be any shape, and the number of hole structures 41 can be determined according to actual conditions, reducing the difficulty of selecting the punching device.

[0055] Embodiment six: refer to Figures 1-11 The hole structure 41 is opened through the middle of the fuse link 40.

[0056] The principle and beneficial effects of the above scheme are:

[0057] The hole structure 41 is opened through the middle of the fuse link 40, which can balance the resistance values of the two ends of the fuse link 40, and further avoid the phenomenon of slow response or premature fusing of the structure.

[0058] Embodiment seven: refer to Figures 1-11 Each end of the fuse link 40 is connected with the top of one conductive sheet 42, the bottom of the conductive sheet 42 is connected with a pin 43, and the pin is plated with a tin or silver or nickel or gold protective layer.

[0059] The principle and beneficial effects of the above scheme are:

[0060] The setting of the conductive sheet 42 can increase the height of the fuse link 40, so that when the fuse link 40 fuses, it will not burn the surrounding elements, and connecting the pin 43 at the bottom of the conductive sheet 42 facilitates welding the structure with the power line; The pin is plated with a tin or silver or nickel or gold protective layer, and the setting of the protective layer can improve the stability of the fuse protection and the reliability of the device welded on the PCB.

[0061] Embodiment eight: refer to Figures 1-11 A fillet 44 is arranged between the end of the fuse link 40 and the top of the conductive sheet 42.

[0062] The principle and beneficial effects of the above scheme are:

[0063] A fillet 44 is arranged between the end of the fuse link 40 and the top of the conductive sheet 42, which can increase the smoothness of the structure as a whole, reduce the edges and corners, and avoid scratching the operator or installation tool during installation of the structure; at the same time, the fillet 44 can avoid the phenomenon of premature fusing after the current or temperature rises due to the increase of the resistance value in the length direction of the structure.

[0064] Embodiment nine: refer to Figures 1-11 The end of each conductive sheet 42 is connected with a protrusion 45 on each side.

[0065] The principle and beneficial effects of the above scheme are:

[0066] The protrusions 45 arranged on both sides of the conductive sheet 42 reduce the difficulty of grabbing the structure.

[0067] Embodiment ten: refer to Figures 1-11 The protrusions 45 are arranged in the middle of the conductive sheet 42.

[0068] The principle and beneficial effects of the above scheme are:

[0069] In order to further reduce the difficulty of grabbing the structure and prevent the protrusions 45 from being stuck on other elements before welding, the protrusions 45 are arranged in the middle of the conductive sheet 42.

[0070] Embodiment eleven: refer to Figures 1-11 The stamping machine comprises a mounting table 1, a bottom die 2, a driving assembly 3 and a stamping assembly 4, the mounting table 1 is connected with the bottom die 2, the mounting table 1 is connected with the driving assembly 3, the bottom die 2 is connected with the stamping assembly 4, the top of the stamping assembly 4 is connected with the output end of the driving assembly 3, and the output end of the stamping assembly 4 is arranged towards the positioning groove in the middle of the bottom die 2.

[0071] The principle of the above scheme is:

[0072] The mounting table 1 is used to fix the driving assembly 3, the fuse link blank is placed in the positioning groove of the bottom die 2, the driving assembly 3 is started to drive the stamping assembly 4 to move, and the fuse link blank in the positioning groove is stamped to obtain the hole structure 41, thereby completing the manufacturing of the fuse link 40; and based on the prior art, the bottom of the positioning groove is provided with a space for accommodating the waste fuse link blank after stamping.

[0073] The beneficial effects of the above scheme are:

[0074] By arranging the output end of the driving assembly 3 to be connected with the stamping assembly 4, the stamping assembly 4 stamps the fuse link blank in the positioning groove of the bottom die 2, thereby greatly reducing the stamping difficulty of the hole structure 41.

[0075] Embodiment twelve: refer to Figures 1-11 The driving assembly 3 comprises a motor 5, a spline shaft 6, a spline sleeve 7, an eccentric wheel 8 and a guide wheel 9, the motor 5 is connected to the mounting table 1, the end of the motor 5 is connected to the end of the spline shaft 6, the other end of the spline shaft 6 is connected to the end of the spline sleeve 7, the other end of the spline sleeve 7 is connected to the bottom die 2, the middle part of the plurality of eccentric wheels 8 is connected to the spline sleeve 7 at equal intervals, the distance from the middle part of the eccentric wheel 8 to the bottom is the lower diameter, the distance from the middle part of the eccentric wheel 8 to the top is the upper diameter, the lower diameters of each eccentric wheel 8 are equal, the upper diameters of the plurality of eccentric wheels 8 gradually decrease in the direction towards the motor 5, one eccentric wheel 8 is frictionally connected with the guide wheel 9, and the guide wheel 9 is rotationally connected to the top of the stamping assembly 4.

[0076] The principle of the above scheme is:

[0077] When the hole structure 41 needs to be processed, the eccentric wheel 8 with a different upper diameter is selected according to the different thicknesses of the fuse link blank, so as to adjust the stamping stroke of the stamping assembly 4, so as to process the through hole structure 41 on the fuse link blank with different thicknesses;

[0078] When a thicker fuse link blank needs to be processed, the spline sleeve 7 is moved towards the motor 5, thereby moving the longer eccentric wheel 8, when the bottom of the eccentric wheel 8 is in contact with the guide wheel 9, the motor 5 is started, the rotation of the motor 5 drives the spline shaft 6 to rotate, the spline shaft 6 drives the spline sleeve 7 to rotate, thereby driving the eccentric wheel 8 to rotate, the eccentric wheel 8 in rotation is in frictional connection with the guide wheel 9, thereby driving the stamping assembly 4 to move downward for stamping to obtain the hole structure 41;

[0079] When a thinner fuse link blank needs to be processed, the spline sleeve 7 is moved away from the motor 5, thereby moving the shorter eccentric wheel 8, when the bottom of the eccentric wheel 8 is in contact with the guide wheel 9, the motor 5 is started, the rotation of the motor 5 drives the spline shaft 6 to rotate, the spline shaft 6 drives the spline sleeve 7 to rotate, thereby driving the eccentric wheel 8 to rotate, the eccentric wheel 8 in rotation is in frictional connection with the guide wheel 9, thereby driving the stamping assembly 4 to move downward for stamping to obtain the hole structure 41.

[0080] The beneficial effects of the above scheme are:

[0081] By arranging the plurality of eccentric wheels 8 with different upper diameters on the spline sleeve 7, the stroke of the stamping assembly 4 driven by the frictional connection between the eccentric wheel 8 and the guide wheel 9 changes, thereby stamping the fuse link blank with different thicknesses, improving the practicability of the device and the adaptability to different workpiece processing;

[0082] The sliding connection of the spline shaft 6 and the spline sleeve 7 greatly reduces the difficulty of adjusting the position of the different eccentric wheels 8, and reduces the complexity of the device. The connection of the spline shaft 6 and the output end of the motor 5 reduces the complexity of the device in design, and further reduces the difficulty of the device in maintenance and maintenance;

[0083] The spline sleeve 7 is a hollow structure, so when the rotating eccentric wheel 8 rubs against the guide wheel 9, the heat transmitted to the spline sleeve 7 by the eccentric wheel 8 can be quickly dissipated, further preventing the accumulation of heat on the spline sleeve 7, preventing the phenomenon of thermal deformation during work, preventing the separation of the rotating eccentric wheel 8 and the guide wheel 9, and avoiding the phenomenon of stamping failure or sudden impact causing damage to parts during work;

[0084] Because the spline sleeve 7 is provided with a plurality of eccentric wheels 8 with different diameters, after stamping a plurality of blank materials with the same thickness, the eccentric wheels 8 with different diameters are replaced, and the last eccentric wheel 8 in work has sufficient time to dissipate heat and avoid aging;

[0085] The device generates heat during work, and the heat conduction channels exist between the interval arranged eccentric wheels 8. The rotation of the eccentric wheel 8 drives the flow of air to dissipate heat, and the convection of air occurs between the two eccentric wheels 8 due to the temperature difference, further dissipating the heat generated during friction of the device, and improving the heat dissipation efficiency of the device during work.

[0086] Embodiment thirteen: refer to Figures 1-11 The bottom die 2 is rotatably connected with two shafts 10, the shafts 10 are connected with gears 11, the top of the shafts 10 is connected with nuts 12, each gear 11 is meshingly connected with one side of a rack 13, the rack 13 is slidably connected with the bottom die 2, and the end of the rack 13 is rotatably connected with the other end of the spline sleeve 7.

[0087] The principle of the above scheme is:

[0088] When the diameter of the eccentric wheel 8 rubbing against the guide wheel 9 needs to be replaced, the nut 12 is rotated, the nut 12 drives the shaft 10 to rotate, the shaft 10 drives the gear 11 to rotate, and under the sliding cooperation of the bottom die 2 and the rack 13, the gear 11 drives the rack 13 meshingly connected therewith to move towards the motor 5, thereby driving the spline sleeve 7 to move;

[0089] When the eccentric wheel 8 with a smaller diameter that rubs against the guide wheel 9 needs to be replaced, the nut 12 is rotated in the reverse direction, the rotating shaft 10 is rotated by the nut 12, the gear 11 is rotated by the rotating shaft 10, under the sliding fit of the bottom die 2 and the rack 13, the rack 13 connected with the gear 11 by meshing is moved away from the motor 5, and the spline sleeve 7 is further moved.

[0090] The beneficial effects of the above scheme are:

[0091] The gear 11 is connected with the rack 13 by meshing, which reduces the difficulty of adjusting the position of the spline sleeve 7 in the horizontal direction.

[0092] Further, the rack 13 fixes the other end of the spline sleeve 7 during rotation, keeps the axis of the spline sleeve 7 and the top of the bottom die 2 always in parallel, further improves the safety of the device during work, avoids the reduction of the stability of the friction between the eccentric wheel 8 and the guide wheel 9, further eliminates the vibration of the device during work, so as to control the punching precision of the punching assembly 4, reduces the setting of other positioning structures near the positioning groove in the bottom die 2 or parts for positioning the blank, not only reduces the weight of the whole device, but also prevents the loosening of parts in the device after a period of work, realizes the suppression of potential resonance, further improves the machining precision of the hole structure 41, and then realizes the precise adjustment of the resistance value of the fuse link 40, reduces the difficulty of adjusting the fuse current of the fuse link 40, and improves the yield rate of the device during production.

[0093] Embodiment fourteen: refer to Figures 1-11The stamping assembly 4 comprises a stamping rod 14, the guide wheel 9 is rotationally connected to the top of the stamping rod 14, the stamping rod 14 is connected with a mounting disc 15, the bottom of the mounting disc 15 is connected with the top of a guide disc 17 through a spring 16, the guide disc 17 is connected with the inner wall of a mounting pipe 18, the guide hole in the middle of the guide disc 17 is slidably connected with the stamping rod 14, the mounting pipe 18 is connected with the bottom die 2, the guide disc 17 is arranged below the mounting disc 15, a piston 19 is arranged below the guide disc 17, the inner wall of the mounting pipe 18 is connected with a positioning disc 20, the positioning disc 20 is arranged below the guide disc 17, the piston 19 and the positioning disc 20 form a pressure cavity 21, the pressure cavity 21 is filled with lubricating oil, the piston 19 is slidably sealed with the inner wall of the pressure cavity 21, a rotating shaft two 22 is rotationally connected to the middle of the positioning disc 20, a plurality of blades 23 are connected to the side wall of the rotating shaft two 22, the rotating shaft two 22 is arranged in the pressure cavity 21, the through hole in the middle of the rotating shaft two 22 is slidably sealed with the stamping rod 14, the inner wall of the pressure cavity 21 is connected with the end of a liquid inlet pipe 24, the top of the positioning disc 20 is connected with the end of a liquid outlet pipe 25, a one-way valve is connected in the liquid inlet pipe 24, a one-way valve two is connected in the liquid outlet pipe 25, the side wall of the rotating shaft two 22 is connected with the inner wall of a ratchet ring 30, the ratchet ring 30 is meshingly connected with a ratchet 31, the ratchet 31 is connected with the top of a rotating shaft three, the ratchet 31 is connected with the top of the positioning disc 20 through a torsional spring, and the rotating shaft three is rotationally connected with the top of the positioning disc 20.

[0094] The principle of the above scheme is:

[0095] The eccentric wheel 8 in rotation is frictionally matched with the guide wheel 9, in order to prevent the guide wheel 9 from being excessively rubbed, the guide wheel 9 is rotationally connected to the top of the stamping rod 14, when the bottom of the eccentric wheel 8 is in contact with the guide wheel 9, the stamping rod 14 will not move relative to the mounting pipe 18, after the eccentric wheel 8 rotates, one side of the bottom of the eccentric wheel 8 begins to be frictionally matched with the guide wheel 9, the length of the spring 16 connected to the mounting disc 15 increases, with the continuous rotation, one side of the eccentric wheel 8 is frictionally matched with the guide wheel 9, then the top of the eccentric wheel 8 is frictionally matched with the guide wheel 9, driving the stamping rod 14 to move downward, after the stamping rod 14 finishes the downward stamping, the spring 16 drives the stamping rod 14 to move upward and reset under the resetting elastic force, and prepares for the next stamping, the rotation of the eccentric wheel 8 is continuously carried out, and finally drives the stamping rod 14 to move reciprocatingly in the longitudinal direction;

[0096] When the stamping rod 14 moves, the guide hole in the middle of the guide disc 17 guides the stamping rod 14 to prevent it from deviating, thereby ensuring the accuracy of stamping;

[0097] The downward moving punch rod 14 drives the piston 19 to move, reduces the volume of the pressure chamber 21, the one-way valve closes, and the lubricating oil in the pressure chamber 21 is discharged through the one-way valve two of the liquid outlet pipe 25; the upward moving punch rod 14 drives the piston 19 to move, increases the volume of the pressure chamber 21, the one-way valve two closes, and the lubricating oil enters the pressure chamber 21 through the one-way valve of the liquid inlet pipe 24;

[0098] Since the side wall of the rotating shaft two 22 is connected with a plurality of paddles 23, when the lubricating oil in the pressure chamber 21 starts to be discharged, the paddles 23 drive the rotating shaft two 22 to rotate relative to the punch rod 14, the rotating shaft two 22 is connected with the ratchet ring 30 in rotation, at this time the ratchet 31 will not hinder the rotation of the ratchet ring 30; when the pressure chamber 21 is injected with lubricating oil, the paddles 23 will have a tendency to reverse due to the influence of the reverse flowing lubricating oil, at this time the ratchet ring 30 is locked by the ratchet 31, and finally the rotating shaft two 22 is fixed, that is, the tooth top inclined surface in the ratchet ring 30 is arranged towards the rotating direction of the paddle 23.

[0099] The beneficial effects of the above scheme are:

[0100] The pressure chamber 21 supplements the lubricating oil through the liquid inlet pipe 24 and releases the lubricating oil through the liquid outlet pipe 25. The existence of the lubricating oil can first lubricate the piston 19 and the mounting pipe 18, prevent the piston 19 or the mounting pipe 18 from being worn after long-term work, improve the perpendicularity of the punch rod 14 to the top of the bottom die 2 during reciprocating motion on the basis of ensuring the integrity of the parts, and further ensure the accuracy of the stamping.

[0101] The continuously circulating hydraulic oil can cool the piston 19, the mounting pipe 18 and the punch rod 14. The bottom end of the cooled punch rod 14 will not expand after being heated, so that the hole structure 41 will not expand after being stamped, and the fuse link 40 itself will not have a phenomenon of resistance value drop, so that the battery management system PCB board of the battery pack will not have a phenomenon of early melting under the rated current. At the same time, the phenomenon of axis deviation of the punch rod 14 after continuous work due to heating can be ensured. The fuse link 40 always maintains symmetry on both sides in its cross section, so that the axis of the hole structure 41 after stamping can be perpendicular to the top of the fuse link 40. When the battery management system PCB board of the battery pack reaches the melting current of the fuse link 40 and needs to be disconnected, the phenomenon of one side being disconnected and the other side being connected will not occur, which greatly improves the response speed of the fuse link 40.

[0102] Since the piston 19 is connected with the punch rod 14, when the punch rod 14 moves downward, the piston 19 is resisted by the lubricating oil, which acts as a buffer. The larger the diameter of the eccentric wheel 8, the greater the resistance of the lubricating oil when the bottom end of the eccentric wheel 8 contacts the top end of the guide wheel 9. This prevents the piston 19 from colliding with other components in the pressure chamber 21 after the spring 16 breaks, and prevents the bottom mold 2 from being damaged by the collision during processing.

[0103] The rotating paddle 23 can stir the lubricating oil, thereby increasing the flowability of the lubricating oil, destroying the agglomerates in the lubricating oil that has been in a shutdown state for a long time, and ensuring the circulation of the lubricating oil. The non-rotating paddle 23 keeps the second rotating shaft 22 fixed, so that when the pressure chamber 21 is refilled with lubricating oil, the stroke of the relative movement between the second rotating shaft 22 and the reset punch rod 14 is reduced, reducing the wear between the second rotating shaft 22 and the punch rod 14.

[0104] Embodiment Fifteen: Figures 1-11 The outlet pipe 25 is connected to the end of the coil pipe outside the mounting pipe 18, the coil pipe is connected to the bottom mold 2, and the other end of the coil pipe is connected to the other end of the inlet pipe 24.

[0105] The principle of the above scheme is:

[0106] The flowing lubricating oil enters the coil pipe to be cooled, then enters the inlet pipe 24 through the other end of the coil pipe, and is again supplied to the pressure chamber 21.

[0107] The beneficial effects of the above scheme are:

[0108] The lubricating oil flowing through the coil pipe can be cooled, increasing the cooling efficiency of the pressure chamber 21.

[0109] Embodiment Sixteen: Figures 1-11 The bottom end of the second rotating shaft 22 is connected to a plurality of flaps 26 on the side wall below the bottom end of the mounting pipe 18, and the bottom end of the punch rod 14 is arranged below the bottom end of the second rotating shaft 22 and is concentric with the punch through hole of the bottom mold 2.

[0110] The principle and beneficial effects of the above scheme are:

[0111] When the punch rod 14 moves downward for punching, the paddle 23 rotates to drive the rotation of the second rotating shaft 22, and the fan blade 26 rotates synchronously, so that the fan blade 26 can blow air to the punch rod 14 and the fuse link during the punching process. At this time, the punch rod 14 can dissipate the heat generated during the last punching process through the flowing air flow, and blow away the dust on the top of the blank to be processed, thereby improving the cleanliness of the blank after processing and the punch rod 14 itself; when the punch rod 14 moves upward, the rotation of the fan blade 26 stops. The reason for such arrangement is to prevent the fuse link 40 in the positioning groove from being fixed by the downward air flow, so that the operator or other workpieces cannot take out the fuse link 40 in time, thereby affecting the next punching work.

[0112] In addition, due to the upward movement of the punch rod 14, even if there is flowing air, it cannot timely cool the gradually shortened punch rod 14. Since the process of discharging lubricating oil is synchronized with the downward movement of the punch rod 14, the fan blade 26 continuously rotates, so that the cooling efficiency of the punch rod 14 during contraction is far lower than that during the downward movement of the punch rod 14 and after the extension of the punch rod 14 after the movement is completed. The contracted punch rod 14 can be cooled by the lubricating oil just injected into the pressure cavity 21, so that the stop of air supply during the contraction of the punch rod 14 greatly improves the rationality of the device during operation.

[0113] Embodiment seventeen: Figures 1-11 The air inlet pipe 27 is connected to the mounting pipe 18, the air inlet end of the air inlet pipe 27 is arranged outside the side wall of the mounting pipe 18, the cooling part of the air inlet pipe 27 is arranged in the pressure cavity 21, the top end of the cooling part is arranged in parallel with the top surface of the second rotating shaft 22, and the air outlet end of the air inlet pipe 27 is arranged towards the top of the fan blade 26.

[0114] The principle and beneficial effects of the above scheme are:

[0115] In order to increase the air supply amount of the fan blade 26, the air inlet pipe 27 is arranged, the bottom of the air inlet pipe 27 can provide an air flow channel for the top of the fan blade 26, thereby increasing the air flux;

[0116] In order to prevent the downward movement of the piston 19 from colliding with the air inlet pipe 27, the top of the cooling part of the air inlet pipe 27 is arranged in parallel with the top surface of the second rotating shaft 22;

[0117] The air inlet pipe 27 arranged in the pressure cavity 21 can cool the discharged lubricating oil due to the flowing air in the air inlet pipe 27, thereby preventing the efficiency of the coil from being reduced during heat dissipation.

[0118] Embodiment eighteen: Figures 1-11 Figures 1-11 The top of the fan blade 26 is slidably connected with the vibration block 28, one side of the vibration block 28 towards the second rotating shaft 22 is connected with the end of the second spring 29, and the other end of the second spring 29 is connected with the top of the fan blade 26.

[0119] The principle and beneficial effects of the above scheme are:

[0120] The device will have dust accumulation phenomenon after long-term shutdown, this phenomenon is the most fan blade 26, similarly, the device is located in the environment, there is a lot of dust content will also lead to dust accumulation on the fan blade 26, when the fan blade 26 rotates, under the sliding fit of the vibration block 28 and the top of the fan blade 26, and the centrifugal force under the vibration block 28 moves away from the direction of the second shaft 22, the length of the spring 29 is elongated; when the fan blade 26 stops rotating, under the sliding fit of the vibration block 28 and the top of the fan blade 26, under the action of the elastic force of the spring 29 reset, the vibration block 28 moves to the direction of the second shaft 22, and hits the fan blade 26; Because the device is provided with a plurality of eccentric wheels 8 with different diameters, so when the diameter of the eccentric wheel 8 is large, the displacement of the vibration block 28 is large, so the vibration generated on the fan blade 26 after its reset is large, when the diameter of the eccentric wheel 8 is small, the displacement of the vibration block 28 is small, so the vibration generated on the fan blade 26 after its reset is small, and the dust removal effect is different accordingly;

[0121] The device can select different circulating amounts of lubricating oil based on the actual punching depth when punching, the punching depth is large, the circulating amount of lubricating oil is large, and then the heat dissipation of the lubricating oil and the heat dissipation speed of the fan blade 26 are fast, the punching depth is small, the circulating amount of lubricating oil is small, and then the heat dissipation of the lubricating oil and the heat dissipation speed of the fan blade 26 are slow, greatly improving the self-control ability of the device and the adaptability to different working conditions.

[0122] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, it can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. An optimized design method for a battery pack protection structure, characterized in that, The method comprises the following steps: Determine the position of the power line based on the battery management system PCB board in the battery pack; After determining the position of the power line, use a multimeter to measure its rated current; Based on the rated current, select a fuse link blank with a melting current of 3 times the rated current; Use a punch to punch the fuse link blank to obtain a fuse link with a melting current of 1.5-2.5 times the rated current; The punch comprises a mounting table (1), a bottom die (2), a driving assembly (3), and a punching assembly (4). The mounting table (1) is connected with the bottom die (2). The driving assembly (3) is connected to the mounting table (1). The punching assembly (4) is connected to the bottom die (2). The top of the punching assembly (4) is connected with the output end of the driving assembly (3). The output end of the punching assembly (4) is arranged towards the positioning groove in the middle of the bottom die (2). The driving assembly (3) comprises a motor (5), a spline shaft (6), a spline sleeve (7), an eccentric wheel (8), and a guide wheel (9). The motor (5) is connected to the mounting table (1). The output end of the motor (5) is connected with the end of the spline shaft (6). The other end of the spline shaft (6) is slidingly connected with the end of the spline sleeve (7). The other end of the spline sleeve (7) is connected with the bottom die (2). The spline sleeve (7) is equidistantly connected with the middle parts of multiple eccentric wheels (8). The distance from the middle part to the bottom of the eccentric wheel (8) is the lower diameter. The distance from the middle part to the top of the eccentric wheel (8) is the upper diameter. The lower diameters of each eccentric wheel (8) are equal. The upper diameters of the multiple eccentric wheels (8) gradually decrease in the direction towards the motor (5). One eccentric wheel (8) is frictionally connected with the guide wheel (9). The guide wheel (9) is rotationally connected to the top of the punching assembly (4). Two rotating shafts (10) are rotationally connected to the bottom die (2). The rotating shafts (10) are connected with gears (11). The top of the rotating shafts (10) is connected with nuts (12). Each gear (11) is meshingly connected with one side of a rack (13). The rack (13) is slidingly connected with the bottom die (2). The end of the rack (13) is rotationally connected with the other end of the spline sleeve (7). The stamping assembly (4) comprises a stamping rod (14), a guide wheel (9) is rotationally connected to the top of the stamping rod (14), a mounting disc (15) is connected to the stamping rod (14), the bottom of the mounting disc (15) is connected to the top of a guide disc (17) through a spring (16), the guide disc (17) is connected to the inner wall of a mounting pipe (18), a guide hole in the middle of the guide disc (17) is slidingly connected to the stamping rod (14), the mounting pipe (18) is connected to the bottom die (2), the guide disc (17) is arranged below the mounting disc (15), a piston (19) is arranged below the guide disc (17), a positioning disc (20) is connected to the inner wall of the mounting pipe (18), the positioning disc (20) is arranged below the guide disc (17), the piston (19) and the positioning disc (20) form a pressure cavity (21), lubricating oil is injected into the pressure cavity (21), the piston (19) is slidingly sealed to the inner wall of the pressure cavity (21), a rotating shaft two (22) is rotationally connected to the middle of the positioning disc (20), a plurality of paddles (23) are connected to the side wall of the rotating shaft two (22), the rotating shaft two (22) is arranged in the pressure cavity (21), a through hole in the middle of the rotating shaft two (22) is slidingly sealed to the stamping rod (14), the inner wall of the pressure cavity (21) is connected to the end of a liquid inlet pipe (24), the top of the positioning disc (20) is connected to the end of a liquid outlet pipe (25), a one-way valve is connected to the liquid inlet pipe (24), a one-way valve two is connected to the liquid outlet pipe (25), the side wall of the rotating shaft two (22) is connected to the inner wall of a ratchet ring (30), the ratchet ring (30) is meshingly connected to a ratchet (31), the ratchet (31) is connected to the top of a rotating shaft three, the ratchet (31) is connected to the top of the positioning disc (20) through a torsional spring, the rotating shaft three is rotationally connected to the top of the positioning disc (20); The other end of the liquid outlet pipe (25) arranged outside the mounting pipe (18) is connected to the end of a disc pipe, the disc pipe is connected to the bottom die (2), and the other end of the disc pipe is connected to the other end of the liquid inlet pipe (24); A plurality of fan blades (26) are connected to the side wall below the bottom end of the mounting pipe (18), the bottom end of the stamping rod (14) is arranged below the bottom end of the rotating shaft two (22) and is arranged concentrically with the stamping through hole of the bottom die (2); An air inlet pipe (27) is connected to the mounting pipe (18), the air inlet end of the air inlet pipe (27) is arranged outside the side wall of the mounting pipe (18), the cooling part of the air inlet pipe (27) is arranged in the pressure cavity (21), the top end of the cooling part is arranged in parallel with the top surface of the rotating shaft two (22), and the air outlet end of the air inlet pipe (27) is arranged towards the top of the fan blade (26).

2. The method of claim 1, wherein, The material of the fuse link blank is lead-antimony alloy or zinc alloy or copper alloy.

3. The method of claim 1, wherein, When the rated current is measured by using a multimeter, the power line in operation is measured three times and the average value is taken.

4. The method of claim 1, wherein, The punching of the fuse link blank by the stamping machine obtains a hole structure, the hole structure reduces the volume of the fuse link blank, and further reduces the resistance value of the fuse link blank.

5. A battery pack protection structure, adapted to the optimization design method of a battery pack protection structure according to any one of claims 1-4, characterized in that, It comprises: A fuse link and a hole structure, the hole structure is arranged on the fuse link.

6. The battery pack protection structure of claim 5, wherein The hole structure is arranged through the middle of the fuse link.

7. The battery pack protection structure of claim 5, wherein The top of each conducting sheet is connected with one end of the fuse link, and the bottom of the conducting sheet is connected with a pin, which is plated with a tin, silver, nickel or gold protective layer.

8. The battery pack protection structure of claim 7, wherein, A round corner is arranged between the end of the fuse link and the top of the conducting sheet.

9. The battery pack protection structure of claim 8, wherein, The end of each conducting sheet is connected with one end of a protrusion.

10. The battery pack protection structure of claim 9, wherein, The protrusion is arranged in the middle of the conducting sheet.

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