43results about How to "Improve welding yield" patented technology

The invention relates to the technical field of new energy, and discloses a battery and a battery pack, the battery comprises: a shell, the shell contains a Ti element, and the mass of the Ti element accounts for more than or equal to 60% of the total mass of the shell; the pole column is arranged on the shell; the battery cell comprises a battery cell body and tabs, the tabs comprise a positive tab and a negative tab, one of the positive tab and the negative tab is electrically connected with the pole, and the other one of the positive tab and the negative tab is electrically connected with the shell; the ratio of the mass of the Ti element of the shell to the total mass of the shell is a, the conductivity of the shell is b, and the lead-out size of the tab from the cell body is c; a. C / b is greater than or equal to 99 and less than or equal to 3650. According to the battery provided by the invention, the relationship among a, b and c is comprehensively controlled, so that the light weight of the shell is realized, the over-current capability of the battery can be met, the battery is prevented from generating relatively large temperature rise, and the condition that the safety performance of the battery is poor is prevented.

This invention belongs to the field of battery technology and discloses an ultrasonic welding head structure, ultrasonic welding equipment, and a battery. The ultrasonic welding head structure includes a first welding head and a second welding head. The thickness of the first electrode tab is t1. The first welding head includes a first welding head body and a first welding tooth. The first welding tooth is disposed on the first welding head body and has a tooth height of h1, a1≤h1 / t1≤b1, where a1 is a first preset minimum value and b1 is a first preset maximum value. The thickness of the second electrode tab is t2. The second welding head includes a second welding head body and a second welding tooth. The second welding tooth is disposed on the second welding head body and has a tooth height of h2, a2≤h2 / t2≤b2, where a2 is a second preset minimum value and b2 is a second preset maximum value. The hardness of the first electrode tab is less than that of the second electrode tab, and the thickness of the first electrode tab is greater than that of the second electrode tab, a1>a2, b1<b2, in order to improve the welding yield of the first electrode tab and the first adapter piece.

The application relates to the technical field of batteries, and provides a battery terminal structure, a cover plate structure, a battery, a battery pack and an electric equipment. The battery terminal structure comprises a terminal platform, the terminal platform is used for being connected with a tab of a battery; a cover, the cover comprises a cover body part and a terminal part, the cover body part comprises a body part and a connecting part, the body part is formed with an accommodating space with an opening on one side, at least part of the terminal part is located in the accommodating space, and the connecting part is used for fixedly connecting with the terminal platform; and the connecting part is arranged on a circumferential edge of the terminal part. According to the embodiment of the application, the processing difficulty of the battery can be simplified, and the process cost is reduced.

The present application relates to a kind of automobile executor assembly equipment, for the loading of parts in succession, cover and welding operation of being carried out in executor shell;Including flow transfer table, is provided with parallel arrangement and transmission direction opposite automatic feeding line;Manual feeding line, the two ends of automatic feeding line and manual feeding line are connected by carrying line;Welding station, is provided with carousel transmission mechanism;Transfer manipulator, be between flow transfer table and welding station, for feeding to automatic feeding line, and the executor assembly of being assembled to manual feeding line is clamped and transported to welding station and is welded work;Welding station is provided with positioning device, positioning device includes the displacement scale group being arranged above welding station, and the jacking assembly being arranged below welding station, welding station is provided with the fixture plate capable of being driven to lift by jacking assembly, the fixture plate is provided with the positioning column corresponding with displacement scale group on;Fixture plate is lifted under the action of jacking assembly, makes displacement scale group and positioning column contact positioning.

The application belongs to the technical field of new energy battery pole friction welding, in particular to a new energy battery pole friction welding device; it comprises: a friction welding machine, which can perform friction welding on copper poles and aluminum poles; a manipulator, the front end of the manipulator is provided with a gripper, and the clamping of the gripper and the manipulator realizes the feeding and discharging of the friction welding machine; the new energy battery pole friction welding device further comprises: a cleaning unit; the front end of the manipulator is provided with a cleaning unit, when welding, the upper surface of the copper pole and the lower surface of the aluminum pole are welded, so the cleaning unit realizes the pre-welding cleaning of the upper surface of the copper pole and the lower surface of the aluminum pole through wiping and blowing and the overturning of the gripper; the welding quality is ensured, and the welding yield of the new energy battery pole is improved.

The utility model relates to the technical field of machine manufacturing, and discloses a ladder manufacturing positioning tool which comprises a supporting frame body and a plurality of connecting pieces, at least one pair of first positioning plates distributed at intervals in the first direction is arranged at the top of the supporting frame body, a first positioning hole is formed in each first positioning plate, and a second positioning hole is formed in each first positioning plate. A plurality of pairs of second positioning plates distributed at intervals in the first direction are arranged on one side of the supporting frame body in the height direction at intervals, each second positioning plate is provided with a second positioning hole, and the first direction is perpendicular to the height direction of the supporting frame body. Every two connecting plates located on different main frames can correspond to at least one pair of first positioning plates or at least one pair of second positioning plates, and the first positioning holes and the second positioning holes are used for assisting in positioning the positions of through holes to be formed in the corresponding connecting plates. Each connecting piece is detachably connected with a through hole formed in the connecting plate and the first positioning hole or the second positioning hole corresponding to the through hole. And the ladder stand manufacturing yield is high, and the universality is good.

The utility model discloses a cylindrical battery, the both ends of the roll core in the shell are equipped with first tab and second tab respectively, the first tab includes a plurality of first tab sections that are arranged at intervals along the circumference, and the second tab includes a plurality of second tab sections that are arranged at intervals along the circumference, the threaded pole of the first current collector disc is insulated through the pole through -hole and is connected with the nut outside the shell, the first current collector disc is equipped with the first through -hole, and the first tab section passes through the first through -hole and is connected with the side of the first current collector disc away from the roll core after bending, the second current collector disc is equipped with the second through -hole, and the second tab section passes through the second through -hole and is connected with the side of the second current collector disc away from the roll core after bending, and the shell open end is closed through the cover plate. Advantageous effects: the utility model passes through the tab and is bent towards the through -hole of the current collector disc and is welded on the side of the current collector disc away from the roll core, makes the welding position of the tab and the current collector disc in the visible state, is favorable to reduce the false welding, the welding -leak phenomenon and so on, improves the welding yield.

The invention discloses a core wire welding device which is provided with a core wire shaping mechanism, a core wire welding dynamic deviation rectifying device, a CCD module and a welding assembly, the core wire shaping mechanism is used for shaping a core wire, and the core wire welding dynamic deviation rectifying device is used for rectifying deviation of the core wire by swinging a cable. The core wire shaping device has the beneficial effects that two corresponding core wires can be separated through positioning of the center positioning piece of the core wire shaping mechanism, and then the core wires are pressed and clamped through the clamping part, so that the core wires can be attached to a bonding pad and return to a welding area of the bonding pad, core wire shaping is achieved, and the core wire welding dynamic deviation correcting device is used for correcting the core wires. The CCD module captures the image of the welding area of the product, so that the offset of the core wire and the bonding pad can be obtained, the shifting fork shifts the core wire cable, the positions of the core wire and the bonding pad are adjusted, the core wire is located in the welding area of the bonding pad, the welding quality is improved, and the welding yield is increased.

The utility model provides a single battery, battery pack and electronic device, this single battery includes casing, electrode assembly, lid and current collection member, the casing includes side wall, and the side wall surrounds to have the opening, electrode assembly installs in the casing, the lid blocks the opening, and is welded fixed with the side wall, current collection member sets up between the lid and electrode assembly, and current collection member and the current collection department of electrode assembly electric connection, wherein, at the side of lid away from electrode assembly, the lid includes thinning area, and the side surface of thinning area away from electrode assembly recess forms first recess, and the welding mark is formed by the welding connection of lid, side wall and current collection member, and the welding mark is located in first recess. The utility model can improve the technical problem of the welding quality of prior art because of the big thickness of lid, reduces the safety and the yield of single battery.

The invention discloses a welding positioning device for an air suspension hoop. The welding positioning device comprises a fixed bottom plate, a sliding mechanism, a first inner mold, a second inner mold, a first inclined pressing mechanism, a second inclined pressing mechanism and a centering mechanism, wherein the first inclined pressing mechanism and the second inclined pressing mechanism are symmetrically arranged; the first inner mold and the second inner mold are fixedly arranged on the fixed bottom plate and the sliding back plate respectively, a gap is reserved between the first inner mold and the second inner mold, and semi-arch-shaped supporting blocks of the first inner mold and the second inner mold are used for supporting hoops. The centering insertion piece can be inserted into the gap for centering, the first inclined pressing mechanism firstly presses the first end of the hoop to be attached to the centering insertion piece, after the centering insertion piece is withdrawn, the second inclined pressing mechanism fixes the second end of the hoop, and the sliding mechanism drives the second inner mold to drive the second end of the hoop to be in accurate butt joint with the first end. According to the welding positioning device for the air suspension hoop, strict alignment of the two free ends of the hoop in the up-down direction and the front-back direction is achieved, the welding yield is greatly increased, and the welding positioning device is suitable for the large-batch low-cost production requirement.

A fixture for fixing and welding a BMS board to a battery cell includes a base with a cavity for holding the BMS board and the battery cell. The cavity has a through hole at its bottom for the battery cell leads to extend out. Two or more first magnets are symmetrically arranged in two rows on the base, located on either side of the cavity. A cover plate is placed on the base to fix the BMS board and battery cell within the cavity; the cover plate has at least one welding hole on its upper part. Two second magnets, the same number as the first magnets but with opposite magnetic properties, are symmetrically arranged in two rows on the lower part of the cover plate, corresponding to the positions of the first magnets, so that when the cover plate is placed on the base, the first and second magnets attract each other. This invention, through the positioning of the cavity, ensures the accuracy of the relative position between the battery cell assembly and the BMS board, and precisely positions the B+, B-, B1, and B2 welding points, greatly improving the welding yield.

This utility model relates to the field of lithium battery technology, and proposes a soldering structure and a cylindrical lithium-ion battery. The soldering structure includes multiple parallel and spaced solder lines, and the solder lines are wavy in shape. The width W1 of the soldering structure is 1.6-3.4 mm; the minimum distance W10 between two adjacent solder lines is 0.6-1.1 mm. By controlling the reasonable size of the soldering, problems such as welding explosions and discoloration of solder lines caused by heat concentration due to excessively small soldering can be avoided. At the same time, excessively large soldering can prevent the increase in laser travel, the reduction in welding efficiency and production capacity, and the decrease in welding reliability caused by the expansion of the solder line area, thereby effectively improving welding quality and efficiency.

The application relates to the battery technical field and discloses a battery monomer, a battery device, a power utilization device and an ultrasonic welding device. The battery monomer comprises a shell, a pole and an electrode assembly. The pole is arranged in the shell, and the electrode assembly is accommodated in the shell and comprises a tab part. The tab part comprises a plurality of tab pieces. The plurality of tab pieces are stacked and connected to form a folding part. The folding part has at least one first region, at least one second region and at least one third region. The first region is connected with the third region through the second region. The compaction degree of the plurality of tab pieces in the first region is greater than that in the second region. The compaction degree of the plurality of tab pieces in the second region is greater than that in the third region. The folding part has a connecting part electrically connected with the pole. Part of the outer periphery of the connecting part is located in the first region. Part of the outer periphery of the connecting part is located in the second region. Therefore, the problem of cracks in the edge of the connecting part can be improved, and the reliability of the battery monomer is improved.

The invention belongs to the technical field of power semiconductors, and particularly discloses an IGBT module welding jig and a welding method.The jig comprises a bottom plate and a DBC positioning frame, mounting holes are formed in the edges of the four corners of the bottom plate respectively, a pin is arranged in each mounting hole, and the DBC positioning frame is fixed to the upper surface of the bottom plate through the pins. Through the one-time welding process and the welding jig, the welding efficiency and the yield of the IGBT module can be improved.

This utility model discloses a special fixture for laser welding of 5G base station surge protectors, including a base plate, a base movably mounted on the base plate, and a top seat with a movable cover mounted on the base plate. The base plate has several contoured grooves; the shape of the contoured grooves matches the outline of the 5G base station surge protector. The top seat has several mounting holes, and the positions of the mounting holes correspond to the contoured grooves. A boss is provided on the inner circumference of each mounting hole, and a pressing and light-blocking mechanism is installed thereon. The pressing and light-blocking mechanism includes a sliding seat and an elastic pressure tongue assembly and an elastic light-blocking assembly mounted thereon. The elastic pressure tongue assembly includes a guide shaft cover, a guide shaft with a guide ring, a guide shaft spring, a pressure tongue, and a fixing screw. The elastic light-blocking assembly includes a shoulder screw, a light-blocking block spring, and a light-blocking block. The pressure tongue and light-blocking block are arranged around the area below the welding hole, achieving high-precision and rapid positioning of the fixture, blocking laser energy dissipation, and adjusting the pressing and light-blocking positions.

The utility model discloses a kind of formation negative pressure suction devices suitable for cylindrical battery, including positioning sleeve, suction pipe and suction nozzle, the port of positioning sleeve first end is equipped with mounting plate;The suction pipe is along the axial direction of the positioning sleeve and is set in the mounting plate, the suction nozzle is arranged in the positioning sleeve and includes connected connecting section and conical section, the connecting section is connected with the suction pipe, the conical section is used to seal with the liquid injection hole.The formation negative pressure suction device suitable for cylindrical battery of the utility model can effectively prevent electrolyte from overflowing during suction process, thereby reducing the residue of electrolyte on the cell cover plate, reducing the risk of electrolyte pollution. Since the pollution of electrolyte is reduced, the subsequent sealing nail welding yield is improved, thereby reducing the defective rate in production process, improve production efficiency. In addition, electrolyte pollution is reduced, the demand of manual wiping or machine wiping is reduced, thereby reducing production cost.

The invention discloses a core wire welding dynamic deviation rectifying device and a core wire welding method. A micro motor is installed on a lifting body, a swing arm is installed at the power output end of the micro motor, the axis of the micro motor is perpendicular to the swing plane of the swing arm, an avoiding groove is formed in the lifting body, and the bottom of the swing arm penetrates through the avoiding groove; the top of the swing arm can swing in the receding groove, a shifting fork for shifting a cable where the core wire is located is arranged at the bottom of the swing arm, and core wire welding comprises the following steps of primary image capturing, core wire cable clamping, secondary image capturing, primary cable shifting, primary welding, tertiary image capturing, secondary cable shifting and secondary welding. The device has the beneficial effects that an image of a product welding area is captured in real time through the CCD module, so that the offset of a core wire and a bonding pad can be obtained, the core wire is located in the welding area of the bonding pad by independently controlling the shifting fork to shift a core wire cable, and therefore the welding quality is improved, and the welding yield is increased.

The invention provides a reflow soldering selective temperature control device and method based on neural network PID control, and relates to the technical field of selective temperature control, visual scanning monitoring of distribution of elements with different heat capacities is carried out on a PCB, temperature field data is acquired from visual scanning information, and real-time element size information of a preset key area is extracted; performing control quantity analysis, and outputting the control quantity of the independent temperature control module corresponding to the preset key area; carrying out selective temperature compensation analysis on a preset key area, carrying out selective temperature compensation control according to compensation analysis data, carrying out adjustment analysis on adjustment parameters of a micro heater, carrying out parameter adjustment control on the micro heater according to adjustment analysis data, and obtaining selective temperature control data; dynamic and accurate local temperature compensation can be realized for elements with different heat capacities on the same PCB, so that the temperature difference between the elements is remarkably reduced, and welding defects caused by different heat capacities of large and small elements are avoided.

This application provides a battery cell and a battery pack, relating to the field of battery technology. The battery cell includes: a housing, an electrode assembly, an end cap, terminals, and a conductive element. The electrode assembly is disposed within the housing; the end cap is connected to the housing; the terminals are disposed within the end cap; the conductive element is disposed within the housing, and is located on the side of the end cap near the electrode assembly. The conductive element is electrically connected to the electrode assembly, and the side of the conductive element near the end cap is welded to the terminals. A first embossed area is provided on the side of the conductive element away from the end cap. The first embossed area and the terminals are opposite each other. The first embossed area has multiple first grooves, each first groove being arranged circumferentially along the terminals and forming a closed structure. The multiple first grooves are concentrically arranged and spaced apart. The battery cell provided in this application increases the surface roughness of the conductive element, thereby reducing the reflectivity of the conductive element to laser light, which helps to improve the welding yield between the terminals and the conductive element, thus improving the electrical performance and safety of the battery cell.

The utility model relates to a battery and a welding head, and relates to the technical field of battery manufacturing, the battery comprises a battery cell and a tab, the tab is connected with the battery cell, the tab is provided with at least one welding printing unit, and the welding printing unit is provided with a first middle area, a first edge area and a second edge area, at least one first welding printing groove is formed in the first middle area, at least one second welding printing groove is formed in each of the first edge area and the second edge area, and the depth of the first welding printing groove is larger than that of the second welding printing groove. According to the battery and the welding head provided by the embodiment of the invention, the problem that the tooth heights of different parts of the welding head are easy to generate deformation deflection can be improved, the ultrasonic welding quality is improved, and the service life of the welding head is prolonged.

The application discloses a cable connector, which comprises an insulating seat, a first terminal array, a second terminal array, a metal shell and a cable; the insulating seat is provided with a support platform; the first terminal array and the second terminal array each comprise at least one pair of differential signal terminals and ground terminals; the cable comprises a core wire group, and the core wire group comprises signal conductors and ground conductors; wherein a plurality of accommodating grooves are arranged between the first terminal array and the second terminal array; the signal conductors are electrically connected to the differential signal terminals on one side of the support platform; and the ground conductors are bent into one of the accommodating grooves and are electrically connected to the ground terminals on the other side of the support platform. The ground conductors are directly arranged on the lateral sides of the differential signal terminals, thereby improving the electromagnetic shielding effect between two adjacent pairs of differential signal terminals, improving the electromagnetic shielding effect of the first terminal array and the second terminal array, reducing the electromagnetic interference in the signal transmission process, and ensuring the stability of high-frequency signal transmission.

A method for manufacturing a high-precision mini LED circuit board involves: pre-enlarging one side of a first copper layer to a thickness greater than the designed thickness; sequentially attaching an adhesive layer and a support layer to one side of the first copper layer; partially etching the corresponding pad pattern on the other side to form a semi-etched groove; then silkscreening solder paste and polishing to form the pads; taking a first single-sided copper-clad laminate composed of an insulating dielectric layer and a second copper layer, stacking and pressing the sides of the insulating dielectric layer corresponding to the pads to form a laminated board; sequentially removing the pre-enlarged area, support layer, and adhesive layer from the laminated board to create surface circuit patterns, followed by subsequent processing to form the circuit board; by using a thick copper layer to replace the designed copper layer, and constructing a reverse processing structure with adhesive and support layers, the pads are reverse-formed on the insulating dielectric layer, and the circuit patterns are simultaneously reverse-formed, avoiding the hemispherical protrusion problem of the solder surface caused by solder spraying, providing a high-quality substrate for subsequent LED chip soldering, and effectively reducing the hidden dangers of cold solder joints and poor contact.

The invention relates to a CCS integrated structure based on ultrasonic direct welding and a manufacturing method. The CCS integrated structure based on ultrasonic direct welding comprises a base material body, a folding part and a positioning piece. A first bonding pad is arranged on the base material body; the folding part is connected with the base material body, a second bonding pad is arranged at the end, away from the base material body, of the folding part, and the folding part is constructed to be capable of being bent in the direction of the base material body so that the second bonding pad can be overlapped with the first bonding pad to form an ultrasonic welding area; and the positioning piece is arranged between the base material body and the folding part and is used for fixing the relative position between the base material body and the folding part after the second bonding pad and the first bonding pad are overlapped. According to the CCS integrated structure based on ultrasonic direct welding and the manufacturing method, the special requirement for the thickness of a common base material in the ultrasonic welding process can be reduced.

The utility model discloses a fan support welding tool which comprises a base, a chuck assembly and three clamping assemblies, the chuck assembly comprises a first installation plate, the first installation plate is fixedly installed on the top of the base, three sliding seats are evenly distributed on the top of the first installation plate, a clamping jaw is installed on each sliding seat in a sliding mode, and the three clamping assemblies are fixedly installed on the base. A second mounting plate is mounted at the top of the sliding seat, a control plate is rotatably mounted at the bottom of the first mounting plate, the clamping assembly comprises mounting seats, first clamping rods and second clamping rods, one mounting seat is mounted at the top of each second mounting plate, the first clamping rods are fixedly mounted at the tops of the mounting seats, and the second clamping rods are fixedly mounted at the tops of the first clamping rods. The second clamping rod is rotationally mounted at the top of the mounting seat, and one end of the first clamping rod is elastically connected with one end of the second clamping rod through a spring. The fan support welding device is used for welding a fan support, the difficulty of welding operation can be reduced, dislocation and the like can be avoided, and the welding efficiency and the yield are improved.

The application discloses a chip welding method, wherein the chip welding method comprises the following steps: printing tin paste on a pad of a substrate to be processed; wherein the height difference between the highest point of the substrate to be processed and the lowest point of the substrate to be processed is less than or equal to 45 microns; flattening the tin paste on the pad by a pressing block to compensate for the height difference of the substrate to be processed; and welding a solder ball on a chip with the tin paste. The method widens the limit of the substrate warpage in the traditional process, and effectively improves the welding yield.

The utility model discloses a resistance welding head relates to resistance welding equipment technical field. Including first pressure regulating spare, second elastic pressure regulating spare, first detection sensor, second detection sensor, slide rail, base body, slide rail limit block, welding head installation unit, gravity balance elastic part, the base body includes limit part and slide seat department respectively, before carrying out resistance welding, can through first pressure regulating spare to second elastic pressure regulating spare and apply or release the pressure of need adjusting, then through it and reach the welding head installation unit department through gravity balance elastic part to reach slide rail after the pressure of need adjusting and apply or release to realize the pressure regulating purpose.

The application relates to the technical field of batteries and discloses a battery cell and a battery pack. The battery cell comprises a shell with an open end, and the end face of the open end is a first end face; a cover plate assembly is arranged at the open end of the shell, and the cover plate assembly comprises a cover plate, the cover plate comprises a cover plate body, a reinforcing ring part and a lap joint ring part, the reinforcing ring part is connected to the outer circumferential side of the cover plate body in a surrounding manner, the upper surface of the reinforcing ring part is provided with a groove, the lower surface of the reinforcing ring part is provided with a convex rib corresponding to the groove, the convex rib extends into the inner cavity of the shell and is in gap cooperation with the side wall of the shell, and the lap joint ring part is connected to the outer circumferential side of the reinforcing ring part in a surrounding manner and is lapped on the first end face; the size of the bottom wall of the groove along the ring width direction of the reinforcing ring part is w1, and the recess depth of the groove along the up-down direction is h3, wherein the relationship between w1 and h3 satisfies the formula: 0.3 <= w1 / h3 <= 0.8. On the basis of strengthening the structural strength of the cover plate, the material cost and the weight of the battery cell are reduced, and the battery cell is lightened.

This disclosure relates to a welding method and welding system for a battery casing. The casing includes a housing surrounding a battery cell and a cover plate for sealing the ends of the housing. The welding method is used to weld the cover plate to the housing. The welding method includes: obtaining a welding path and dividing the welding path into at least a first segment and a second segment connected sequentially; controlling a welding head to weld at a uniform speed in the first segment; and controlling the welding head to weld at a uniform acceleration starting from the end of the first segment in the second segment. When welding the battery casing and the cover plate, making the welding speed of the second segment a uniform acceleration greater than that of the first segment can reduce the laser energy input of the welding head to the latter segment, i.e., reduce the line energy. Even if the welding heat from the first segment accumulates in the latter segment, it will ensure good consistency of the penetration depth between the first and latter segments of the welding path, thereby resulting in a high welding yield and good welding quality for the battery casing.

This utility model relates to the field of photovoltaic technology, specifically to a device for flattening conductive wires in stacked-grid solar cells. The device includes a support component, a power component, a transmission component, and a pressing component. The support component has a positioning structure to achieve precise positioning of the solar cells. The power component drives the transmission component to move the pressing component vertically. The pressing component presses the conductive wires with a pressing element, and an elastic buffer on the outside of the pressing element ensures that the conductive wires are fully flattened and of uniform height. This device effectively increases the contact area between the conductive wires and the connecting strips, reduces welding difficulty, and improves welding yield and solar cell yield. It is suitable for the production of stacked-grid solar cells.

The utility model belongs to battery technical field discloses a kind of explosion-proof valve, external protection component and battery.The explosion-proof valve includes explosion-proof valve body and extension part, extension part is set along the outer edge of explosion-proof valve body, the outer side wall of extension part is connected to the inner side wall of explosion-proof through-hole, skirt is set on the one end of extension part close to the bottom port of explosion-proof through-hole, skirt is connected to the peripheral surface on the bottom port of explosion-proof through-hole.Because of the existence of seam bottom skirt, when explosion-proof valve is welded on external protection component, it can effectively avoid the problem that external protection component is welded through due to the thickness of external protection component is relatively thin, thereby effectively improve the welding yield and welding quality of explosion-proof valve, and further enhance the use safety of external protection component, so that the battery provided with the above external protection component not only has higher energy density, but also can improve battery production quality, stability and use safety.