Optimization design method of battery pack protection structure and battery pack protection structure

Abstract

The invention relates to the technical field of batteries, in particular to an optimal design method of a battery pack protection structure and the battery pack protection structure, and the method comprises the following steps: determining the position of a power line based on a battery management system PCB in a battery pack; after the position of the power line is determined, a universal meter is used for measuring rated current; selecting a fuse link blank of which the fusing current is three times of the rated current based on the rated current; according to the method, the fuse link blank is punched through a punching machine, the fuse link with the fusing current 1.5-2.5 times of the rated current is obtained, according to the method, the fuse link blank with the fusing current 3 times of the rated current is selected to be punched, the machining allowance is reserved for punching of the fuse link blank, the phenomenon that the rated current is excessively reduced after one-time punching is avoided, and the service life of the fuse link is prolonged. The obtained fuse link is simple in structure and high in response speed.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to an optimized design method for a battery pack protection structure and the battery pack protection structure. Background Art

[0002] The battery management system of a battery, i.e., BMS, is used for monitoring parameters such as the voltage, current, and temperature of the batteries in a battery pack, as well as state information such as the SOC (State of Charge) and SOH (State of Health) of the batteries. At the same time, it can also perform balancing management between multiple battery components in the battery pack. It has charge and discharge protection functions itself and can alarm and diagnose faults in the battery pack. Therefore, it is a very important electronic component in the battery pack. In the prior art, a protection structure is often set on the power line of its circuit board to provide safety protection for the entire system.

[0003] However, there are still serious deficiencies in the prior art. For example, a battery fuse with the patent number CN202420044576.7 includes a housing assembly, a terminal assembly, and a melt assembly. The housing assembly includes an upper housing and a lower housing, which are connected to each other to form an accommodation space filled with filler for arc extinguishing. The terminal assembly includes a first terminal piece and a second terminal piece. The first terminal piece and / or the second terminal piece is composed of two or more metal materials. The first terminal piece is arranged on one side of the housing assembly, one end of the first terminal piece extends into the accommodation space and is fixed on the housing assembly, and the other end of the first terminal piece is used to connect to the battery tab. The second terminal piece is arranged on the other side of the housing assembly, one end of the second terminal piece extends into the accommodation space and is fixed on the housing assembly, and the other end of the second terminal piece is used to connect to the battery tab. The structure of this device is too complex and its practicality is extremely low. Summary of the Invention

[0004] The present invention provides an optimized design method for a battery pack protection structure and the battery pack protection structure to solve the situation proposed in the background art.

[0005] To achieve the above-mentioned invention purpose, the present invention provides the following technical solutions: An optimized design method for a battery pack protection structure includes the following steps:

[0006] Determine the position of the power line based on the PCB board of the battery management system in the battery pack;

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

[0008] Select a fuse blank with a fusing current 3 times the rated current based on the rated current;

[0009] The fuse piece blank is punched by a stamping machine to obtain a fuse piece with a fusing current 1.5 - 2.5 times the rated current.

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

[0011] Preferably, when measuring its rated current with a multimeter, the power supply line during operation is measured three times and the average value is taken.

[0012] Preferably, after the fuse piece blank is punched by a stamping machine, a hole structure is obtained. The hole structure reduces the volume of the fuse piece blank, thereby reducing the resistance value of the fuse piece blank.

[0013] Preferably, a battery pack protection structure is applicable to the optimization design method of the battery pack protection structure described in any one of the above, and includes: a fuse piece and a hole structure, and the hole structure is opened on the fuse piece.

[0014] Preferably, the hole structure runs through and is opened in the middle of the fuse piece.

[0015] Preferably, each end of the fuse piece is connected to the top of a conductive piece, the bottom of the conductive piece is connected to a lead pin, and the lead pin is plated with a tin or silver or nickel or gold protective layer.

[0016] Preferably, a fillet is provided between the end of the fuse piece and the top of the conductive piece.

[0017] Preferably, each side of each conductive piece is connected to the end of a bump.

[0018] Preferably, the bump is arranged in the middle of the conductive piece.

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

[0020] In the solution of the present invention:

[0021] The method punches the fuse piece blank with a fusing current 3 times the rated current, leaving a machining allowance for the stamping of the fuse piece blank, avoiding the phenomenon that the rated current decreases too much after one - time stamping, and the obtained fuse piece has a simple structure and a fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the flow chart of the present invention;

[0023] Figure 2 is the structural schematic diagram of the fuse piece of the present invention;

[0024] Figure 3 is the schematic diagram of the connection relationship between the conductive piece and the bump of the present invention;

[0025] Figure 4Structural diagram of the press body of the present invention;

[0026] Figure 5 Cross-sectional view of the press of the present invention;

[0027] Figure 6 Schematic diagram of the meshing connection relationship between the gear and the rack of the present invention;

[0028] Figure 7 Schematic diagram of the rotational connection relationship between the guide wheel and the punching rod of the present invention;

[0029] Figure 8 Schematic diagram of the position where the pressure chamber is opened in the present invention;

[0030] Figure 9 Schematic diagram of the rotational connection relationship between the positioning and the second rotating shaft of the present invention;

[0031] Figure 10 Schematic diagram of the sliding connection relationship between the vibration block and the fan blade of the present invention;

[0032] Figure 11 Schematic diagram of the meshing connection relationship between the ratchet ring and the ratchet of the present invention.

[0033] Wherein: mounting table 1, bottom die 2, drive assembly 3, punching 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, punching rod 14, mounting disc 15, spring 16, guide disc 17, mounting pipe 18, piston 19, positioning disc 20, pressure chamber 21, second rotating shaft 22, paddle 23, liquid inlet pipe 24, liquid outlet pipe 25, fan blade 26, air inlet pipe 27, vibration block 28, second spring 29, ratchet ring 30, ratchet 31, fuse piece 40, hole structure 41, conductive piece 42, pin 43, rounded corner 44, convex block 45. Specific embodiments

[0034] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0035] Embodiment 1: Refer to Figures 1 - 11 , an optimized design method for a battery pack protection structure and the battery pack protection structure, including the following steps:

[0036] Determine the position of the power line based on the PCB board of the battery management system in the battery pack;

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

[0038] Select a fuse piece blank with a fusing current 3 times the rated current based on the rated current;

[0039] The fuse piece blank is punched using a stamping machine to obtain a fuse piece 40 with a fusing current that is 1.5 - 2.5 times the rated current.

[0040] The principle and beneficial effects of the above solution are as follows:

[0041] First, locate the PCB board of the battery management system within the battery pack, accurately determine the position of its power supply line, quickly determine the rated current of the power supply line using an ammeter case, then select a fuse piece blank with a fusing current that is 3 times the rated current. Subsequently, use a stamping machine to punch the fuse piece blank. The punching reduces the volume of the fuse piece blank and lowers its resistance value, thereby achieving a reduction in the rated current. After stamping, a fuse piece 40 with a fusing current that is 1.5 - 2.5 times the rated current is obtained, completing the precise design of the fuse piece 40; the reason for selecting a fuse piece 40 with a fusing current that is 1.5 - 2.5 times the rated current is that the PCB board of the battery management system itself belongs to a control circuit with a relatively small current and needs to operate for a long time. Such a selection can improve the response speed of the fuse piece 40 when a circuit fault occurs and will not affect the operation of the normal circuit at the same time;

[0042] The method punches a fuse piece blank with a fusing current that is 3 times the rated current, leaving a machining allowance for the stamping of the fuse piece blank, avoiding the phenomenon of excessive reduction in the rated current after a single stamping. The obtained fuse piece 40 has a simple structure and a fast response speed.

[0043] Example Two: Refer to Figures 1 - 11 , the material of the fuse piece blank is lead - antimony alloy or zinc alloy or copper alloy.

[0044] The principle and beneficial effects of the above solution are as follows:

[0045] The fuse piece blank is made of lead - antimony alloy or zinc alloy or copper alloy. These three alloys are easily obtainable, and the strength of the fuse piece 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] Example Three: Refer to Figures 1 - 11 , when using a multimeter to measure its rated current, the power supply line during operation is measured three times and the average value is taken.

[0047] The principle and beneficial effects of the above solution are as follows:

[0048] Using a multimeter to obtain the rated current reduces the measurement difficulty. In addition, by taking the average value of three measurements, the accuracy of the measurement result is improved.

[0049] Example Four: Refer to Figures 1 - 11, After punching the fuse sheet blank with a stamping machine, a hole structure 41 is obtained. The hole structure 41 reduces the volume of the fuse sheet blank, thereby reducing the resistance value of the fuse sheet blank.

[0050] The principle and beneficial effects of the above solution are as follows:

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

[0052] Example Five: Refer to Figures 1 - 11 , A battery pack protection structure applicable to the optimized design method of any one of the above-mentioned battery pack protection structures, including: a fuse sheet 40 and a hole structure 41, and the hole structure 41 is formed on the fuse sheet 40.

[0053] The principle and beneficial effects of the above solution are as follows:

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

[0055] Example Six: Refer to Figures 1 - 11 , The hole structure 41 is formed through the middle part of the fuse sheet 40.

[0056] The principle and beneficial effects of the above solution are as follows:

[0057] The hole structure 41 formed through the middle part of the fuse sheet 40 can balance the resistance values at both ends of the fuse sheet 40, thereby avoiding the phenomenon of untimely or premature fusing response of the structure.

[0058] Example Seven: Refer to Figures 1 - 11 , One end of each of the two ends of the fuse sheet 40 is connected to the top of a conductive sheet 42, the bottom of the conductive sheet 42 is connected to a pin 43, and a tin or silver or nickel or gold protective layer is plated on the pin.

[0059] The principle and beneficial effects of the above solution are as follows:

[0060] The setting of the conductive sheet 42 can increase the height of the fuse sheet 40. Therefore, when the fuse sheet 40 fuses, it will not burn the surrounding components. Connecting the pin 43 to the bottom of the conductive sheet 42 facilitates welding the structure to the power supply line; a tin or silver or nickel or gold protective layer is plated on the pin, and the setting of the protective layer can improve the stability of the fuse protection and the reliability of welding the device on the PCB board.

[0061] Example Eight: Refer to Figures 1 - 11 , A fillet 44 is provided between the end of the fuse sheet 40 and the top of the conductive sheet 42.

[0062] The principle and beneficial effects of the above solution are as follows:

[0063] There is a fillet 44 between the end of the fuse piece 40 and the top of the conductive piece 42. The fillet 44 can increase the overall smoothness of the structure, reduce the sharp corners, and avoid scratching the operator or the installation tool during the installation of the structure; at the same time, the fillet 44 can prevent the resistance value of the structure from increasing in its length direction, and avoid the phenomenon of premature fusing after the current or temperature increases.

[0064] Example Nine: Refer to Figures 1 - 11 , the ends of a convex block 45 are connected to both sides of each conductive piece 42.

[0065] The principle and beneficial effects of the above solution are as follows:

[0066] The convex blocks 45 provided on both sides of the conductive piece 42 reduce the difficulty of grasping the structure.

[0067] Example Ten: Refer to Figures 1 - 11 , the convex block 45 is arranged in the middle of the conductive piece 42.

[0068] The principle and beneficial effects of the above solution are as follows:

[0069] To further reduce the difficulty of grasping the structure and prevent the convex block 45 from getting stuck on other components before welding, the convex block 45 is arranged in the middle of the conductive piece 42.

[0070] Example Eleven: Refer to Figures 1 - 11 , the stamping machine includes: a mounting table 1, a bottom die 2, a driving component 3 and a stamping component 4. The mounting table 1 is connected to the bottom die 2, a driving component 3 is connected to the mounting table 1, a stamping component 4 is connected to the bottom die 2, the top of the stamping component 4 is connected to the output end of the driving component 3, and the output end of the stamping component 4 faces the positioning groove in the middle of the bottom die 2.

[0071] The principle of the above solution is:

[0072] The mounting table 1 is used to fix the driving component 3. Place the fuse piece blank in the positioning groove of the bottom die 2, start the driving component 3 to drive the stamping component 4 to move, and stamp the fuse piece blank in the positioning groove to obtain the hole structure 41, completing the manufacture of the fuse piece 40; and based on the prior art, a space for accommodating the waste of the fuse piece blank after stamping is provided at the bottom of the positioning groove.

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

[0074] By setting the output end of the driving component 3 to be connected to the stamping component 4, and the stamping component 4 stamps the fuse piece blank in the positioning groove of the bottom die 2, the stamping difficulty of the hole structure 41 is greatly reduced.

[0075] Example Twelve: Reference Figures 1 - 11 The driving assembly 3 includes: a motor 5, a spline shaft 6, a spline sleeve 7, an eccentric wheel 8 and a guide wheel 9. A motor 5 is connected to the mounting table 1, the output end of the motor 5 is connected to the end of the spline shaft 6, the other end of the spline shaft 6 is slidably 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 parts of a plurality of eccentric wheels 8 are equidistantly connected to the spline sleeve 7. The distance from the middle part to the bottom of the eccentric wheel 8 is the lower diameter, and 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 set to be equal. In the direction towards the motor 5, the upper diameters of the plurality of eccentric wheels 8 gradually decrease. One eccentric wheel 8 is in frictional engagement with the guide wheel 9, and the guide wheel 9 is rotatably connected to the top of the stamping assembly 4.

[0076] The principle of the above solution is as follows:

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

[0078] When a relatively thick fuse blank needs to be processed, the spline sleeve 7 is moved towards the motor 5, thereby driving the longer eccentric wheel 8 to move. When the bottom of the eccentric wheel 8 comes into contact and cooperation 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 rotating eccentric wheel 8 is in frictional engagement 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 relatively thin fuse blank needs to be processed, the spline sleeve 7 is moved away from the motor 5, thereby driving the shorter eccentric wheel 8 to move. When the bottom of the eccentric wheel 8 comes into contact and cooperation 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 rotating eccentric wheel 8 is in frictional engagement 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 solution are as follows:

[0081] By arranging a plurality of eccentric wheels 8 with different upper diameters on the spline sleeve 7, it is convenient to drive the stroke of the stamping assembly 4 to change by the frictional engagement between the eccentric wheel 8 and the guide wheel 9, thereby stamping the fuse blanks with different thicknesses, improving the practicability of the device and the adaptability to the processing of different workpieces;

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

[0083] The spline sleeve 7 is of a hollow structure. Therefore, when the rotating eccentric wheel 8 rubs against the guide wheel 9, the heat transferred to the spline sleeve 7 by the eccentric wheel 8 can be dissipated quickly, further preventing the accumulation of heat on the spline sleeve 7, preventing it from deforming due to heat during operation, preventing the separation of the rotating eccentric wheel 8 from the guide wheel 9, and thus avoiding the phenomenon of stamping failure or sudden impact causing damage to components during the operation of the device;

[0084] Since there are multiple eccentric wheels 8 with different upper diameters on the spline sleeve 7, after stamping multiple blanks of the same thickness, the eccentric wheel 8 with a different diameter will be replaced, and the previously working eccentric wheel 8 has sufficient time to dissipate heat, avoiding the phenomenon of its own aging;

[0085] The device generates heat after operation. There is a heat diversion channel between the eccentric wheels 8 arranged at intervals. The rotation of the eccentric wheel 8 drives the flow of air for heat dissipation. Due to the different temperatures between the two eccentric wheels 8, air convection occurs, further dissipating the heat generated during friction of the device and improving the heat dissipation efficiency of the device during operation.

[0086] Example Thirteen: Refer to Figures 1 - 11 , two rotating shafts 10 are rotatably connected to the bottom die 2, gears 11 are connected to the rotating shafts 10, nuts 12 are connected to the tops of the rotating shafts 10, each gear 11 is meshed with one side of a rack 13, the rack 13 is slidably connected to the bottom die 2, and the end of the rack 13 is rotatably connected to the other end of the spline sleeve 7.

[0087] The principle of the above solution is:

[0088] When it is necessary to replace the eccentric wheel 8 with a larger diameter that rubs against the guide wheel 9, rotate the nut 12, the nut 12 drives the rotating shaft 10 to rotate, the rotating shaft 10 drives the gear 11 to rotate, and under the sliding fit between the bottom die 2 and the rack 13, the gear 11 drives the rack 13 meshed with it to move towards the direction of the motor 5, thereby driving the spline sleeve 7 to move;

[0089] When it is necessary to replace the eccentric wheel 8 with a smaller diameter that rubs against the guide wheel 9, rotate the nut 12 in the reverse direction. The nut 12 drives the rotation of the rotating shaft 10, and the rotating shaft 10 drives the rotation of the gear 11. Under the sliding fit between the bottom die 2 and the rack 13, the gear 11 drives the rack 13 engaged with it to move away from the motor 5, thereby driving the spline sleeve 7 to move.

[0090] The beneficial effects of the above solution are as follows:

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

[0092] Furthermore, during the operation of the device, the rack 13 fixes the other end of the spline sleeve 7 during rotation, keeping the axis of the spline sleeve 7 always parallel to the top of the bottom die 2. This further improves the safety of the device during operation, prevents the stability of the friction between the eccentric wheel 8 and the guide wheel 9 from decreasing, further eliminates the vibration of the device during operation, so as to control the stamping accuracy of the stamping component 4, reduces the setting of other positioning structures near the positioning groove in the bottom die 2 or parts for positioning the blank. This not only reduces the overall weight of the device but also prevents the loosening of components inside the device after a period of operation, realizes the suppression of potential resonance phenomena, further improves the machining accuracy of the hole structure 41, and then realizes the precise adjustment of the resistance value of the fuse piece 40, reduces the difficulty of adjusting the fusing current of the fuse piece 40, and improves the yield rate of the device during production.

[0093] Example 14: Refer to Figures 1 - 11, the stamping assembly 4 includes: a stamping rod 14, a guide wheel 9 is rotatably connected to the top of the stamping rod 14, an installation disc 15 is connected to the stamping rod 14, the bottom of the installation 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 an installation pipe 18, a guide hole in the middle of the guide disc 17 is slidably connected to the stamping rod 14, the installation pipe 18 is connected to the bottom die 2, the guide disc 17 is arranged below the installation disc 15, a piston 19 is arranged below the guide disc 17, a positioning disc 20 is connected to the inner wall of the installation pipe 18, the positioning disc 20 is arranged below the guide disc 17, the piston 19 and the positioning disc 20 form a pressure chamber 21, lubricating oil is filled in the pressure chamber 21, the piston 19 is slidably sealed with the inner wall of the pressure chamber 21, a second rotating shaft 22 is rotatably connected to the middle of the positioning disc 20, a plurality of blades 23 are connected to the side wall of the second rotating shaft 22, the second rotating shaft 22 is placed in the pressure chamber 21, a through hole in the middle of the second rotating shaft 22 is slidably sealed with the stamping rod 14, the end of a liquid inlet pipe 24 is connected to the inner wall of the pressure chamber 21, the end of a liquid outlet pipe 25 is connected to the top of the positioning disc 20, a one-way valve is connected in the liquid inlet pipe 24, a second one-way valve is connected in the liquid outlet pipe 25, the side wall of the second rotating shaft 22 is connected to the inner wall of a ratchet ring 30, the ratchet ring 30 is meshed with a ratchet 31, the ratchet 31 is connected to the top of a third rotating shaft, the ratchet 31 is connected to the top of the positioning disc 20 through a torsion spring, and the third rotating shaft is rotatably connected to the top of the positioning disc 20.

[0094] The principle of the above solution is as follows:

[0095] The eccentric wheel 8 in rotation is in frictional cooperation with the guide wheel 9. To prevent excessive friction of the guide wheel 9, it is rotatably connected to the top of the stamping rod 14. When the bottom of the eccentric wheel 8 comes into contact and cooperation with the guide wheel 9, the stamping rod 14 will not move relative to the installation pipe 18. When the eccentric wheel 8 rotates, one side of the bottom of the eccentric wheel 8 begins to be in frictional cooperation with the guide wheel 9, and the length of the spring 16 connected to the installation disc 15 increases. As the rotation continues, one side of the eccentric wheel 8 is in frictional cooperation with the guide wheel 9, and then the top of the eccentric wheel 8 is in frictional cooperation with the guide wheel 9, driving the stamping rod 14 to move downward. When the downward stamping of the stamping rod 14 ends, the spring 16 drives the stamping rod 14 to move upward and reset under the restoring elastic force, preparing for the next stamping. Continuing the rotation of the eccentric wheel 8, finally driving the reciprocating motion of the stamping rod 14 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 shifting, thereby ensuring the accuracy of stamping;

[0097] The downward moving stamping rod 14 drives the piston 19 to move, reducing 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 stamping rod 14 drives the piston 19 to move, increasing 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 a plurality of blades 23 are connected to the side wall of the rotating shaft two 22, when the lubricating oil starts to be discharged from the pressure chamber 21, the blade 23 drives the rotating shaft two 22 to rotate relative to the stamping rod 14. The ratchet ring 30 is connected to the rotating shaft two 22 during rotation, and the ratchet 31 at this time will not hinder the rotation of the ratchet ring 30; When the pressure chamber 21 is filled with lubricating oil, the blade 23 will tend to reverse under the influence of the reversely 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 rotation direction of the blade 23.

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

[0100] The pressure chamber 21 replenishes the lubricating oil through the liquid inlet pipe 24 and releases the lubricating oil through the liquid outlet pipe 25. The presence of the lubricating oil can first lubricate the piston 19 and the installation pipe 18, preventing the piston 19 or the installation pipe 18 from being worn after long-term work. On the basis of ensuring the integrity of the parts, the perpendicularity of the stamping rod 14 to the top of the bottom die 2 during reciprocating motion is improved, thereby ensuring the stamping accuracy;

[0101] The continuously circulating hydraulic oil can cool the piston 19, the installation pipe 18 and the stamping rod 14. The bottom end of the cooled stamping rod 14 will not expand due to heat, so the hole structure 41 will not expand in diameter after stamping. Furthermore, the fuse piece 40 itself will not have a decrease in resistance value, and the battery management system PCB board of the battery pack will not be prematurely fused below the rated current; At the same time, it can ensure that the stamping rod 14 has an axis offset phenomenon due to heat after continuous work. The fuse piece 40 always maintains symmetry on both sides of its cross-section. Therefore, the axis of the hole structure 41 after stamping can be perpendicular to the top of the fuse piece 40. When the battery management system PCB board of the battery pack reaches the fusing current of the fuse piece 40 and needs to be opened, there will be no phenomenon that one side is disconnected and the other side is connected, greatly improving the response speed of the fuse piece 40;

[0102] Since the piston 19 is connected to the stamping rod 14, when the stamping rod 14 moves downward, the piston 19 is subject to the resistance of the lubricating oil. At this time, the lubricating oil plays a buffering role. After the bottom end of the eccentric wheel 8 with a larger diameter contacts the top end of the guide wheel 9, the greater the resistance from the lubricating oil, which can prevent the piston 19 from colliding with other components in the pressure chamber 21 after the spring 16 breaks and fails, and at the same time avoid the bottom die 2 in the processing from being damaged by impact;

[0103] The rotating blade 23 can stir the lubricating oil, thereby increasing the fluidity of the lubricating oil to break up the lumps in the lubricating oil that has been in a shutdown state for a long time, and then ensure the circulation of the lubricating oil. The stationary blade 23 keeps the rotating shaft two 22 fixed. Therefore, when the lubricating oil is re-injected into the pressure chamber 21, the stroke of the relative movement between the rotating shaft two 22 and the reset stamping rod 14 is reduced, reducing the wear between the rotating shaft two 22 and the stamping rod 14.

[0104] Example 15: Refer to Figures 1 - 11 , the other end of the liquid outlet pipe 25 outside the installation pipe 18 is connected to the end of the coil pipe. The coil pipe is connected to 2, and the other end of the coil pipe is connected to the other end of the liquid inlet pipe 24.

[0105] The principle of the above solution is:

[0106] The flowing lubricating oil enters the coil pipe for heat dissipation, and then enters the liquid inlet pipe 24 through the other end of the coil pipe and is replenished into the pressure chamber 21 again.

[0107] The beneficial effect of the above solution is:

[0108] The lubricating oil flowing through the coil pipe can dissipate heat, increasing the heat dissipation efficiency of the pressure chamber 21.

[0109] Example 16: Refer to Figures 1 - 11 , a plurality of fan blades 26 are connected to the side wall below the bottom end of the rotating shaft two 22, and the bottom end of the stamping rod 14 is placed below the bottom end of the rotating shaft two 22 and is concentric with the stamping through hole of the bottom die 2.

[0110] The principle and beneficial effect of the above solution are:

[0111] When the stamping rod 14 moves downward for stamping, the blade 23 rotates to drive the rotation of the second rotating shaft 22, and synchronously the fan blade 26 rotates. Therefore, during the stamping process, the fan blade 26 can blow air on the stamping rod 14 and the fuse piece. At this time, the stamping rod 14 can dissipate the heat generated during the previous stamping through the action of the flowing air, and at the same time blow away the dust existing on the top of the blank to be processed, improving the cleanliness of the processed blank and the stamping rod 14 itself; when the stamping rod 14 moves upward, the rotation of the fan blade 26 stops. The reason for this setting is to prevent the fuse piece 40 in the positioning groove from being fixed by the downward air flow, resulting in the operator or other workpieces being unable to take out the fuse piece 40 in time, which affects the next stamping work;

[0112] In addition, due to the upward movement of the stamping rod 14, even if there is flowing air, it cannot cool the gradually shortening stamping rod 14 in time. Since the process of lubricating oil discharge is synchronized with the process of the stamping rod 14 moving downward and the fan blade 26 rotates continuously, the cooling efficiency of the stamping rod 14 when it contracts is much lower than that of the stamping rod 14 when it moves downward and after the movement is completed and the stamping rod 14 extends. The contracted stamping rod 14 can be cooled by the lubricating oil just injected into the pressure chamber 21. Therefore, stopping the air supply when the stamping rod 14 contracts greatly improves the rationality of the device during operation.

[0113] Example Seventeen: Refer to Figures 1 - 11 , an air inlet pipe 27 is connected to the installation pipe 18. The air inlet end of the air inlet pipe 27 is placed outside the side wall of the installation pipe 18, the cooling part of the air inlet pipe 27 is placed in the pressure chamber 21, the top of the cooling part is arranged parallel to 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 solution are:

[0115] To increase the air supply volume of the fan blade 26, the air inlet pipe 27 is provided. The bottom of the air inlet pipe 27 can provide a channel for air flow to the top of the fan blade 26, thereby increasing the air flux;

[0116] To prevent the downward moving piston 19 from hitting the air inlet pipe 27, the top of its cooling part is arranged parallel to the top surface of the second rotating shaft 22;

[0117] Since there is flowing air in the air inlet pipe 27 placed in the pressure chamber 21, it can cool the discharged lubricating oil to prevent the efficiency of the coil during heat dissipation from decreasing.

[0118] Example Eighteen: Refer to Figures 1 - 11 , a vibration block 28 is slidably connected to the top of the fan blade 26. One side of the vibration block 28 facing the second rotating shaft 22 is connected to the end of a second spring 29, and the other end of the second spring 29 is connected to the top of the fan blade 26.

[0119] The principle and beneficial effects of the above solution are as follows:

[0120] When the device has been shut down for a long time, dust accumulation will occur. This phenomenon is most obvious in the fan blade 26. Similarly, in the environment where the device is located, if the dust content is high, it will also cause dust to accumulate on the fan blade 26. When the fan blade 26 rotates, under the sliding fit between the vibration block 28 and the top of the fan blade 26, and under the action of centrifugal force, the vibration block 28 moves away from the rotating shaft two 22, and the length of the spring two 29 elongates; when the rotation of the fan blade 26 stops, under the sliding fit between the vibration block 28 and the top of the fan blade 26, under the elastic force of the spring two 29 during reset, the vibration block 28 moves towards the rotating shaft two 22 and impacts the fan blade 26; since there are multiple eccentric wheels 8 with different diameters in the device, 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, and 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 corresponding dust removal effects are different;

[0121] The device can select different lubricating oil circulation amounts based on the actual stamping depth during stamping. When the stamping depth is large, the lubricating oil circulation amount is large, and thus the heat dissipation of the lubricating oil and the fan blade 26 is fast. When the stamping depth is small, the lubricating oil circulation amount is small, and thus the heat dissipation of the lubricating oil and the fan blade 26 is slow, which greatly improves the device's ability of autonomous control and its adaptability to different working conditions.

[0122] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. An optimized design method for a battery pack protection structure, characterized in that, Including the following steps: Determine the position of the power line based on the PCB board of the battery management system 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 blank with a fusing current three times the rated current; Use a punching machine to punch the fuse blank to obtain a fuse with a fusing current of 1.5 - 2.5 times the rated current.

2. The optimized design method of a battery pack protection structure according to claim 1, characterized in that, The material of the fuse blank is lead - antimony alloy or zinc alloy or copper alloy.

3. The optimized design method of a battery pack protection structure according to claim 1, characterized in that, When using a multimeter to measure its rated current, measure the working power line three times and take the average value.

4. An optimized design method for a battery pack protection structure according to claim 1, characterized in that After using a punching machine to punch the fuse blank to obtain a hole structure, the hole structure reduces the volume of the fuse blank, thereby reducing the resistance value of the fuse blank.

5. A battery pack protection structure applicable to the optimization design method of the battery pack protection structure according to any one of claims 1-4, characterized in that, Including: A fuse and a hole structure, the hole structure is opened on the fuse.

6. The battery pack protection structure according to claim 5, characterized in that, The hole structure runs through the middle of the fuse.

7. A battery pack protection structure according to claim 5, characterized in that, Each end of the fuse is connected to the top of a conductive sheet, the bottom of the conductive sheet is connected to a pin, and the pin is plated with a tin or silver or nickel or gold protective layer.

8. A battery pack protection structure according to claim 7, characterized in that, There is a fillet between the end of the fuse and the top of the conductive sheet.

9. The battery pack protection structure according to claim 8, wherein, Each side of each conductive sheet is connected to the end of a bump.

10. A battery pack protection structure according to claim 9, characterized in that, The bump is arranged in the middle of the conductive sheet.

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