CN106602148B

CN106602148B - soft package lithium battery core and manufacturing process thereof

Info

Publication number: CN106602148B
Application number: CN201611109111.1A
Authority: CN
Inventors: 王辉; 王洋; 孔金河
Original assignee: 孔金河
Current assignee: Hebei zero point Amperex Technology Limited
Priority date: 2016-12-06
Filing date: 2016-12-06
Publication date: 2019-12-17
Anticipated expiration: 2036-12-06
Also published as: CN106602148A

Abstract

the invention discloses a soft-package lithium battery cell and a manufacturing process thereof, which are used for improving the packaging level and improving the safety performance of the battery cell. The battery cell comprises a positive plate, a negative plate, a diaphragm and a soft package shell, wherein the positive plate (A) is arranged between the first diaphragm and the first diaphragm, the periphery of the positive plate is packaged in a heat sealing mode to form diaphragm strips, the diaphragm strips are arranged in the soft package shell in a Z-shaped folding mode, and the negative plate is clamped between two adjacent diaphragm strips; the positive lug welded on the positive plate penetrates through the edge of the diaphragm belt and then extends to the outer side of the soft package shell; the negative electrode lug welded on the negative electrode plate extends to the outer side of the soft can; and electrolyte is filled in the soft package shell. The invention adopts the Z-shaped folding mode, so that the winding stress is avoided, the product consistency is good, and the assembly line type operation mode has better consistency than the traditional lamination mode.

Description

Soft package lithium battery core and manufacturing process thereof

Technical Field

The invention relates to the technical field of lithium battery lamination production, in particular to a soft-package lithium battery core and a manufacturing process thereof.

Background

Soft-packaged cells (also known as "polymer cells") are widely available in some small digital products.

The structure of the current soft package battery cell comprises a laminated structure and a winding structure.

In a common laminated structure, a positive plate, a diaphragm and a negative plate are stacked to form a stacked structure, wherein the diaphragm is disconnected, the laminated structure of the structure is generally characterized in that the diaphragm is cut into thin sheets slightly larger than the plates and then stacked layer by layer, and the problem that lithium ions bypass the diaphragm exists around the diaphragm, so that the influence on the charge and discharge performance of a battery cell is large.

In a common winding structure, the positive plate, the diaphragm and the negative plate are continuous and long-strip-shaped, the three are stacked and wound around a center to form a flat structure, the winding mode of the structure has winding stress, arching and wrinkling phenomena can occur in the long-term application process, and the generation of the phenomena is caused by the inconsistent tension force between winding layers in the winding process.

The technical advantages and the technical defects of the two modes exist, and the main point of the invention is to provide a more excellent scheme.

disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the soft-package lithium battery core and the manufacturing process thereof, which are used for manufacturing the lamination of the square soft-package lithium battery, and the manufacturing process of the novel mode is provided, so that the manufacturing process is more convenient and quicker, higher in efficiency and better in effect, and the isolation effect and the puncture resistance effect of the soft-package lithium battery core are better.

The technical scheme adopted by the invention for solving the technical problems is as follows:

The soft package lithium battery cell comprises a positive plate, a negative plate, a diaphragm and a soft package shell, and is characterized in that,

the diaphragm comprises a first diaphragm and a second diaphragm, a positive plate (A) is arranged between the first diaphragm and the first diaphragm, the periphery of the positive plate is packaged in a heat sealing mode to form diaphragm belts, the diaphragm belts are arranged in a soft package shell in a Z-shaped folding mode, and a negative plate is clamped between two adjacent diaphragm belts;

The positive lug welded on the positive plate penetrates through the edge of the diaphragm belt and then extends to the outer side of the soft package shell;

The negative electrode lug welded on the negative electrode plate extends to the outer side of the soft can;

and electrolyte is filled in the soft package shell.

The manufacturing process of the soft package lithium battery cell is characterized by sequentially carrying out the following steps:

step one, manufacturing a diaphragm strip

The method comprises the following steps that firstly, a first diaphragm releasing mechanism releases a first diaphragm, the first diaphragm falls on a traction belt and is tiled, then positive plates are released through a first continuous releasing device, adjacent positive plates are arranged in an axisymmetric mode, a second diaphragm is released through a second diaphragm releasing mechanism, the positive plates (A) are packaged between the first diaphragm and the second diaphragm through the first continuous releasing device, the distance between the adjacent positive plates (A) is controlled to be 2 mm through an electric partition plate, and finally, a heat sealing mechanism is used for carrying out heat sealing on the periphery of the positive plates, the positive plates are fixed between two layers of diaphragms and are distributed discontinuously and uniformly to form a diaphragm belt;

Step two, lamination manufacturing

the diaphragm strip is subjected to Z-shaped continuous folding through a folding mechanism, negative plates (B) are released through a second continuous release device while the diaphragm strip is folded, the number of the second continuous release devices is two, the negative plates (B) are released into the diaphragm strip from the front side and the rear side respectively, the diaphragm strip is cut by a cutting device after the number of the positive plates is calculated, and finally, a lamination in which the diaphragm strip and the negative plates are orderly overlapped is formed through arrangement;

Step three, pre-assembling the lamination

The lamination is put into a soft package shell, the positive lugs on all the positive plates are welded into a whole, the negative lugs on all the negative plates are welded into a whole, the soft package shell is locally thermally sealed and is provided with a liquid filling port and a liquid outlet,

step four, filling the electrolyte and packaging the soft package shell

Continuously filling liquid into the soft package shell through the electrolyte filling device and replacing all internal air,

And packaging the soft package shell in a heat seal mode.

First diaphragm release mechanism comprises unreeling roller, tensioning roller and nip roll, and is rolled up first diaphragm is located unreels on the roller and through tensioning roller and nip roll back natural tiling on pulling the belt.

The second diaphragm release mechanism has the same structure as the first diaphragm release mechanism.

the heat sealing mechanism comprises a cutter, a quadrilateral linkage mechanism and a first cylinder, wherein the cutter is a rectangular frame, the heat sealing cutter is fixed in the heat sealing frame, an electric heating element for heat sealing the periphery of the positive pole piece is arranged in the heat sealing frame, the upper side of the heat sealing frame is provided with the parallelogram linkage mechanism, one end part of the parallelogram linkage mechanism extends outwards and is hinged with the rack, the parallelogram linkage mechanism has a swinging action under the action of the first cylinder, and in the swinging process, the heat sealing frame is always in a horizontal state.

The electric clapboard comprises a clapboard, a control motor and a guide post, the thickness of the clapboard in the electric clapboard is set to be 2 mm, and the clapboard moves up and down along the guide post under the drive of the control motor.

The folding mechanism comprises a vertical plate, a connecting rod and an electric linear push rod, wherein the lower end of the vertical plate is pivoted on the rack equipment, the middle part and the upper part of the vertical plate are respectively connected with the connecting rod in a hinged mode to form a parallelogram mechanism, and when a diaphragm belt in a vertical state is in place, the folding mechanism acts to change the direction of the diaphragm belt and fold the diaphragm belt.

The first continuous releasing device comprises a box body, a bottom plate, a jacking mechanism and a pushing mechanism, wherein the box body is a rectangular ceramic box, the length of the inner cavity of the box body is 2 mm less than the length of the positive plate in the length direction, the positive plate is equal in the width direction, after the positive plate is placed in the box body, the positive plate has a slightly convex trend in the length direction,

A pair of clamping grooves are formed in an opening at the upper end of the box body, the two clamping grooves are oppositely arranged and fixed at the upper edge of the box body, and the edges of two sides of the positive plate freely slide along the clamping grooves;

The upper end of the box body is provided with a top plate, the lower surface of the top plate is an arc-shaped surface which is concave upwards, and the radian of the top plate is the same as that of the jacking plate,

A first notch for avoiding an electrode leading-out port on the positive plate is arranged in one of the clamping grooves, and a second notch for avoiding a positive electrode leading-out part is arranged on the box body;

The jacking plate is an arc-shaped plate, a soft copper layer is arranged on the upper surface of the arc-shaped plate, a guide column is arranged on the lower side of the arc-shaped plate, and teeth are arranged on two sides of the guide column;

A bottom plate is arranged at the lower opening of the box body in a hinged connection mode, the bottom plate can be opened and closed, the box body is filled with the positive plate in the opening state, and the bottom plate is used for jacking the positive plate in the closing state; a circular hole is formed in the middle of the bottom plate, the guide post penetrates through the circular hole, another symmetrically-arranged gear is mounted on the lower side of the bottom plate, the gear is meshed with teeth on the guide post, and the two gears are driven by a first servo motor through a pair of conical gears which are arranged in opposite directions;

The box comprises a box body clamping groove and is characterized in that a first guide plate and a second guide plate are respectively arranged on the front side and the rear side of the box body clamping groove, a pushing mechanism is installed on the second guide plate and comprises an air cylinder, a pushing plate and a connecting frame, the pushing plate is an alloy plate or a ceramic plate with the thickness equal to that of a positive plate, the front end of the pushing plate is inserted into the clamping groove, the rear end of the pushing plate is connected with a piston of the air cylinder through the connecting frame, and the pushing plate is pushed to reciprocate through the action of the air cylinder.

The second continuous release device and the first continuous release device have the same structure.

The invention has the beneficial effects that:

1. the lamination degree of automation is high, and the whole process is automatically completed by a machine without human intervention, so that the automatic level of production is improved, and the efficiency is improved.

2. because the Z-shaped folding mode is adopted, winding stress does not exist, the product consistency is good, and the assembly line type operation mode has better consistency than the traditional lamination mode.

3. The efficiency is high, and the whole process of diaphragm release, positive plate release, heat seal and negative plate release is finished at one go, and the efficiency is improved by 50%.

4. By adopting the special pole piece release device, the positive pole piece and the negative pole piece are high in release speed and free of damage, and the actual requirements can be met.

drawings

Fig. 1 is a diagram of lamination effect.

Fig. 2 is a perspective view of a single positive electrode tab (negative electrode tab).

Fig. 3 is a schematic diagram of a lamination.

Fig. 4 is one of the lamination processes.

fig. 5 is a simulation of the lamination process.

Fig. 6 is a lamination line layout.

figure 7 is a schematic view of an end of a separator unwind roll.

Fig. 8 is a structure view of the tension roller.

fig. 9 is a perspective view of the heat sealing mechanism.

FIG. 10 is a front view of the heat sealing mechanism.

Fig. 11 is a perspective view of the cutting device.

fig. 12 is a front view of the cutting apparatus.

Fig. 13 is a perspective view of the folding mechanism.

Fig. 14 is a perspective view of a continuous pole piece release device 1.

Fig. 15 is a perspective view of a continuous pole piece release device 2.

Fig. 16 is a perspective view of a continuous pole piece release device 3.

Fig. 17 is a cross-sectional view of a continuous pole piece release.

Fig. 18 is a schematic diagram of the operation of the continuous pole piece release device.

fig. 19 is a schematic diagram of the storage and organization platform.

fig. 20 is a lamination process flow diagram.

Fig. 21 is a schematic diagram of an electrolyte zero air flush apparatus.

Fig. 22 is a structural diagram of a pouch battery clamping and oscillating mechanism.

Fig. 23 is a schematic structural diagram of a pouch battery cell.

In the figure: 1 diaphragm release part, 11 first diaphragm release part, 111 unwinding roller, 1111 nylon sleeve, 112 tension roller, 113 flattening roller, 12 second diaphragm release part, 11 'first diaphragm, 12' second diaphragm, 2 positive plate release part, 3 heat seal part, 31 cutter, 32 quadrilateral linkage mechanism, 33 first cylinder, 34 heat seal frame, 35 hinge point, 4 negative plate release part, 5 arrangement part, 6 cutting part, 61 gantry frame, 62 cutter, 63 second cylinder, 64 counter, 65 thin steel plate, 66 rubber sheet, 67 knife slot, 71 lower traction belt, 711 upper traction roller, 72 electric partition plate, 73 folding mechanism, 731 riser, 732 connecting rod, 733 electric linear push rod, 8 storage arrangement platform, 81 pallet, 82 lifting mechanism, 83 auxiliary cylinder, 84 arrangement plate, 9 continuous release device, 91 box, 911 slot, top plate 912, first gap, 913' second breach, 92 bottom plate, 921 gear, 923 conical gear, 922 first servo motor, 93 jacking board, 94 climbing mechanism, 95 ejecting mechanism, 951 cylinder, 952 ejecting board, 953 link, the first deflector of 901, 902 second deflector, 101 electric pump, 102 electrolyte storage jar, 103 filter, 104 soft packet of battery adds holds and vibrates the mechanism, 1041 vibrations platform, 1042 left and right reciprocal holding board, 1043 rocking arm, 1044 first eccentric wheel, 1045 damping support rod, 1046 ejector pin, 1047 second eccentric wheel, 100 soft packet of.

Detailed Description

due to the difference of production processes of various manufacturers, polymer lithium batteries on the market are divided into two different structures of a winding type (represented by sony and toshiba) and a laminated type (represented by TCL and ATL).

The existing laminating machine and the laminating principle are all layer-by-layer discs, namely, a continuous diaphragm is adopted, the diaphragm is bent in a Z shape by the laminating machine, and a positive plate and a negative plate are implanted into a diaphragm interlayer at intervals to form a lamination, so that the mode has low working efficiency, the automation degree can be improved, but the high-efficiency production is still difficult to meet.

the general design idea is to improve the feeding efficiency of the diaphragm, namely, the continuous and high-speed continuous film feeding is adopted, so that the productivity is improved.

However, the conventional method has a defect in that, when the film feeding speed reaches 1 m/s, since the diaphragm has certain elasticity, a restoring force must be generated during the high-speed winding process, and thus stress is generated, that is, the wound laminate, the electrode is tightly wrapped, and a wrinkle phenomenon is generated.

Aiming at the existing defects, the protection subject of the invention is as follows:

The developed soft package battery cell and the manufacturing process thereof have the advantage that theoretically, the efficiency is improved by more than two times of that of a single-layer diaphragm continuous lamination.

The developed soft package shell lithium battery cell has the advantages that the positive plate and the negative plate are completely isolated and packaged, the inner surface of the metal shell is provided with the insulating coating, the buffer space made of the foaming material is formed, and the packaging quality is improved.

The following description is made by referring to fig. 1 to 20, and the basic principle is that a double-layer diaphragm simultaneous stacking mode is adopted, a positive plate or a negative plate is stacked between two diaphragms in advance, then primary packaging is performed through heat seal, then folding is performed, another negative plate or positive plate is implanted in the folding process to form a composite lamination effect, the lamination formed after finishing is performed, the formed lamination is packaged with a metal shell, and an electrode is welded.

When the diaphragm is folded, the diaphragm which is firstly folded can be sealed in a heat sealing way, so that the positive and negative pole pieces are isolated from each other, and the isolation effect between the positive and negative pole pieces is improved.

meanwhile, aiming at high lamination speed, the traditional sucker type manipulator cannot adapt to the supply of a quick and continuous positive plate or negative plate, and the carrying part of the electrode plate is redesigned so as to achieve the purpose of integral optimization.

Based on the above description, a lamination machine is provided for manufacturing a soft-package battery core: as shown in figures 1 to 20 of the drawings,

Comprises a diaphragm releasing part 1, a positive plate releasing part 2, a heat sealing part 3, a negative plate releasing part 4, a finishing part 5, a cutting part 6 and a conveying part.

The membrane release part 1 comprises a first membrane release mechanism 11 and a second membrane release mechanism 12, and the membrane release part is used for releasing, flattening and flatly laying the coiled membrane in a first-order and a second-order and at a reasonable speed.

Wherein the first diaphragm release mechanism 11 is composed of an unwinding roller 111, a tension roller 112 and a flattening roller 113, and the second diaphragm release mechanism is the same as the first diaphragm release mechanism.

Wherein first diaphragm release mechanism 11 releases first diaphragm 11 'earlier, after the tiling, then releases positive plate, releases second diaphragm 12' again, encapsulates positive plate A between two-layer diaphragm to fix a position, carry out the heat seal at last, form the positive plate that is interrupted, even interval sets up, and wherein the interval setting between two positive plates is about 2 millimeters, and this 2 millimeters interval is realized through electronic baffle.

The diaphragm unreels roller 111 and adopts deciding moment buffer technology, promptly, and the driving motor who unreels roller 111 is servo digital motor, can carry out digital control, adopts deciding the moment device to cushion between unreeling roller 111 and the motor power axle, decides the moment device structure and includes: two nylon cover 1111 that inside and outside cover was put, the damping force through setting up between the nylon cover realizes deciding the moment transmission, and under the normal condition, keep the friction relation between the nylon cover, relative static when driving torque surpasss and sets for moment, realizes skidding, prevents excessively tearing that excessive transmission caused the diaphragm, refer to figure 7.

The tension roller 112 adopts a flexible tension technology, that is, the tension roller is a composite roller, the central mandrel is a steel shaft, the outer surface of the steel shaft is made of rubber, and two ends of the mandrel are mounted on the frame through bearings.

As an alternative scheme, the tension roller is a combination of a flexible shaft and a rubber sleeve, the outer surface of the flexible shaft is covered with the rubber sleeve, the curvature of the tension roller is controlled to be R2 m, and the diaphragm is loosened through rotation to prevent over-tightening. In the installation process, the flexible shaft keeps a certain included angle at two ends.

Further, the above-mentioned tension roller 112 adopts an eccentric structure, that is, the tension roller itself is an eccentric roller, the eccentricity is controlled at 1 cm, and the purpose of loosening is realized through the eccentric operation law, wherein, a gear is installed at one end of the tension roller, the gear is directly driven by a motor, the electrode at this position runs with the motion of pulse type, drives the tension roller to have a discontinuous start-stop shaking action, and the purpose of uncoiling is achieved, refer to fig. 8.

after unwinding, the first membrane 11' laid on the lower traction belt is in a free flattened condition, free of resilient stresses.

The flattening roll 113 is a super smooth roll, the surface fineness of the roll reaches R1.6 (roughness), the diameter is not less than 1 m, the coating angle is not less than 90 degrees, and the super smooth roll is used for stably turning the diaphragm.

The second membrane release mechanism 12 is identical to the first membrane release mechanism and is used for the release of the second membrane 12' arranged in tandem, with the positive plate release portion 2 and the pneumatic separator plate being provided in the middle of the two membrane release mechanisms.

The positive plate release part 2 adopts a continuous release device 9 which is marked as a first continuous release device, carries a positive plate A at each time, and places the positive plate A on a first diaphragm 11', the positive plates are arranged in a left-right crossed mode, the positions of the left positive plate and the right positive plate are different, the positions of the left positive plate and the right positive plate are placed in a positive-negative mode, and the folded positive plates are symmetrical, so that the positive lugs A1 can be led out conveniently by referring to fig. 4. Traditional sucking disc formula manipulator has two problems, and the first problem is that handling speed is slow, needs to inhale, carry, release three action, needs the pneumatic system cooperation, is difficult to quick completion, and the second problem is because the thickness of positive plate is very thin, generally is the aluminium foil of thickness 0.1 millimeter to 0.3 millimeter, produces the adhesion easily, once carries two, causes the maloperation.

The continuous releasing device 9 structurally comprises a box body 91, a bottom plate 92, a jacking plate 93, a jacking mechanism 94 and a pushing-out mechanism 95, and is shown in fig. 14 to 16, wherein the box body 91 is a rectangular box body, a clean ceramic box is adopted, pollution to a positive plate A in the box body can be prevented, the length of an inner cavity of the box body is 2 mm smaller than the length of the positive plate in the length direction, the positive plate A is equal in the width direction, after the positive plate is placed in the box body, the positive plate A has a slightly convex trend in the length direction, and in the reference of fig. 18, the positive plate has certain elasticity and has a tight resilience, and after the positive plate is placed in the box body, the positive plate is upwards convex under the action of the lower jacking plate.

a pair of clamping grooves 911 made of plastic materials are formed in an opening at the upper end of the box body 91, the two clamping grooves are oppositely arranged and fixed at the upper edge of the box body, and two side edges of the positive plate A can freely slide in the clamping grooves 911.

The position of the card slot 911 just can satisfy the free movement of one positive plate, that is, one positive plate is conveyed at a time, and the condition of multiple plates cannot occur due to the limitation of the width of the card slot.

The upper end of the box body 91 is provided with a top plate 912, the lower surface of the top plate 912 is an arc-shaped surface which is concave upwards, the radian is the same as that of the jacking plate 93, the region is a recovery region of the positive plate, in the region, the positive plate A is unfolded, and two side edges of the flattened positive plate A are inserted into the slots.

A first notch 913 for avoiding an electrode lead-out opening on the positive electrode plate is provided in one of the slots 911, and a second notch 913' for avoiding an electrode lead-out portion is provided on the box 91 for leading out an electrode.

The jacking plate 93 is an arc-shaped plate made of metal, a soft copper layer is arranged on the upper surface of the arc-shaped plate 93, a transverse reinforcing rib is arranged on the lower surface of the arc-shaped plate, a cylindrical guide column 931 is led out downwards from the reinforcing rib, and teeth 932 are arranged on two sides of the guide column.

A bottom plate 92 is installed at a lower opening of the box body 91 in a hinged connection mode, the bottom plate can be opened and closed, the box body is filled with the positive plate A in an opening state, and the box body is used for jacking the positive plate in a closed state.

a circular hole is arranged at the right center of the bottom plate 92, the guide post passes through the circular hole, another symmetrically arranged gear 921 is arranged at the lower side of the bottom plate, and the gear 921 is meshed with the teeth 932 on the guide post to form transmission. The two gears are driven by a first servo motor 922 through a pair of bevel gears 923, respectively.

The front side and the rear side of a clamping groove of the box body 91 are respectively provided with a first guide plate 901 and a second guide plate 901, the first guide plate 901 is used for conveying a positive plate to a target position, a positive pressure closed air chamber is arranged on the lower side of the first guide plate, an air inlet of the closed air chamber is connected with the positive pressure air bag through an air path electromagnetic valve, air is supplemented into the closed air chamber through the air path electromagnetic valve, a nozzle mounting hole penetrating through the inside and the outside is formed in the first guide plate, a nozzle is mounted in the nozzle mounting hole and is uniformly unknown in the first guide plate, a structural reference diagram of the nozzle is shown, the air pressure of the closed air chamber is controlled to be about 0.2 MPa, and the air is blown to balance the pole piece, so that the friction resistance between the pole piece and the first guide plate is reduced, and the surface quality of the pole piece is in a high-grade dead.

the second guide plate 902 is used for installing the push-out mechanism 95, wherein the push-out mechanism includes a cylinder 951, a push-out plate 952 and a connecting frame 953, wherein the push-out plate 952 is an alloy plate or a ceramic plate having a thickness equal to that of the positive plate, the front end of the push-out plate is inserted into the slot 911, and the rear end of the push-out plate is connected with the piston of the cylinder through the connecting frame 953. The reciprocating motion of the pushing plate is pushed by the action of the cylinder.

Further, the above-mentioned push-out plate 952 has two limit positions, an initial limit position is located outside the effective area of the positive electrode tab, and an end position is located in the push-out area of the positive electrode tab.

An electric control electric partition plate 72 is arranged above a lower traction belt 71 at the releasing position of the positive plate and comprises a partition plate, a control motor and a guide post, the thickness of the partition plate in the electric partition plate is set to be 2 millimeters, and the partition plate is clamped between two adjacent positive plates to form spacing positioning and ensure that the spacing between the two positive plates is uniform. The electric partition plate 72 has an up-and-down action process, and the specific structure can refer to a cutter mechanism and is a gantry structure, and the cutter in the electric partition plate is replaced by a partition plate with a certain thickness, which is not described in detail herein.

the rear side of the second diaphragm releasing mechanism 12 is provided with a heat sealing part 3 which is a heat sealing mechanism in an electric heating heat sealing mode and comprises a cutter 31, a quadrilateral linkage mechanism 32 and a first air cylinder 33, wherein the cutter 31 is a rectangular frame, the heat sealing cutter is fixed in a heat sealing frame 34, an electric heating element is arranged in the heat sealing frame, the cutter can be heated to 200 ℃ to be enough to locally melt the diaphragm to form heat sealing, the upper side of the heat sealing frame 34 is provided with the parallelogram linkage mechanism 32, one end part of the parallelogram linkage mechanism extends outwards and is hinged with a frame, namely a hinge point 35 in fig. 9, the parallelogram linkage mechanism has a swinging action under the action of the first air cylinder 33, and in the swinging process, the heat sealing frame 34 is always in a horizontal state.

the heat sealing cutter simultaneously performs heat sealing on two adjacent positive plates, and the structural diagram of the heat sealing mechanism is shown with reference to fig. 9 and 10.

The heat seal frame can adopt a structure with a buffer technology, and a buffer spring is embedded in the instant heat seal frame to realize automatic buffering.

And after heat sealing, forming a diaphragm strip C with an anode plate clamped inside, wherein the diaphragm strip C is formed by clamping the anode plate by two continuous diaphragms, and the anode plates are uniformly arranged at equal intervals to form a plurality of continuous laminated sheets.

The rear side of the heat seal cutter is provided with a traction roller assembly, the traction roller assembly comprises an upper traction roller 711 and a lower traction belt 71, and the lower traction belt can move under the driving of a power motor to drive an upper diaphragm to move, and refer to fig. 6.

The upper traction roller 711 is driven by a stepping motor, the surface of the upper traction roller is a rubber compound layer, and patterns are arranged on the surface of the rubber roller, so that traction force is improved.

Be provided with at carry over pinch rolls subassembly rear side and tailor part 6, this portion of tailorring is the pneumatic type device of tailorring, the device includes planer-type frame 61, set up cut-off knife 62 on planer-type frame, the planer-type frame can open and shut from top to bottom under the effect of second cylinder 63, accomplish the action of tailorring, for example, what each electricity core comprises 50 positive and negative pole pieces, then every 50 pole pieces are decided, for the cooperation count, set up a counter 64 in the front side or the rear side of tailorring the device, the preferred magnetic induction counter of counter, count through the quantity of response pole piece, a thickness for control lamination.

For the cooperation cut-off knife tailors, be provided with individual sword groove 67 on the platform under the cut-off knife, place flexible cushion in the sword groove, improve and tailor the regularity to the protection cut-off knife.

A thin steel plate 65 is arranged at the rear side of the cutting device, a flexible rubber sheet 66 is adhered to the rear side of the thin steel plate, the rubber sheet 66 is in a sagging state under the self action, and the sagging length is half of the width of the pole piece, and refer to fig. 11 and 12.

Place one in the side below position of sheet rubber 66 rear side and accomodate arrangement platform 8, accomodate arrangement platform and have automatic raising and lowering functions, including layer board 81, elevating system 82, detection switch, wherein elevating system is located the downside of layer board 81 for the rising and the decline of layer board 81, detection switch is used for detecting the quantity of the diaphragm strip on the layer board, and feeds back to control system, is used for controlling the decline of layer board, and every lamination that falls, the layer board is automatic descends the height of a lamination thickness, descends gradually. The left side and the right side of the supporting plate 81 are respectively provided with a baffle plate which is used for limiting the position of the lamination in the left and right directions, and the lamination is continuous, so that the coarse limiting can be carried out in the left and right directions.

Be provided with an auxiliary cylinder 83 in both sides around accomodating arrangement platform 8, install the arrangement board 84 of a vertical setting on auxiliary cylinder's the piston rod, after the lamination targets in place, through two auxiliary cylinder's reciprocal vibrations, vibrate the arrangement to the diaphragm lamination from both sides around, improve the regularity, wherein auxiliary cylinder from vibration frequency control about 50 per minute.

The front side and the rear side of the storage and arrangement platform are respectively provided with a negative plate release part 4, the structure of the negative plate release part is the same as that of the positive plate release part, and the negative plate release parts are all continuous release mechanisms 9 which adsorb one negative plate at a time to realize operation.

Different from the positive plate release part, the guide plate of the negative plate release part is in an inclined state, so that the negative plate can be conveniently pushed out, and the negative plate can be conveniently and quickly put in place.

And the negative plate releasing parts are arranged at intervals from the front side and the rear side at each time.

The front side of the rubber sheet below the cutting device is provided with a folding mechanism 73, the folding mechanism 73 comprises a vertical plate 731, a connecting rod 732 and an electric linear push rod 733, wherein the lower end of the vertical plate 731 is pivoted on rack equipment, the middle part and the upper part of the vertical plate 731 are respectively connected with the connecting rod in a hinged mode to form a parallelogram mechanism, and the rubber sheet on the upper part is lifted to avoid the out-of-control of the rubber sheet. When the diaphragm strips in the vertical state are in place, the folding mechanism 73 acts to change the direction of the lamination and fold the lamination to realize folding by 90 degrees, and when the lamination is folded, the insertion of the negative pole pieces at the front side and the rear side is realized, and one negative pole piece is inserted from the left side and the right side every time the lamination is folded.

The folding mechanism can be replaced by a horizontally arranged air cylinder, the air cylinder is fixed on the equipment, and then the laminated sheets are overlapped at intervals through an air cylinder piston to form the laminated sheets.

The working process is as follows:

the first diaphragm releasing mechanism firstly releases a first diaphragm, the released first diaphragm is flatly laid on a lower traction belt in a natural mode, the first diaphragm has no tension force, then a positive plate is released, a distance of about 2 mm is kept between the positive plate and the positive plate, the distance of 2 mm is realized through a pneumatic clapboard, then a second diaphragm is released, the second diaphragm has no tension force, the positive plate is packaged between two layers of diaphragms, and finally heat sealing is carried out, a heat sealing point is located at the edge of the positive plate and avoids an electrode part to form discontinuous positive plates arranged at intervals, wherein the distance between the two positive plates is set to about 2 mm to form a fixed diaphragm belt, and the positive plates in the diaphragm belt are independent from each other and arranged at intervals.

Then the vertical plate swings in a folding mechanism in a pulse mode, the laminated diaphragm belt is folded once when swinging once, a negative plate is implanted from the front side and the rear side simultaneously while folding to form a laminated sheet, and finally the laminated sheet is arranged to form a regular shape.

Soft package lithium battery core and manufacturing process thereof

And (3) electrode welding the stacked laminations to form a whole, adopting pressure welding to realize firm welding, wrapping the laminations by using a diaphragm, putting the wrapped laminations into a soft package bag, injecting electrolyte, and finally packaging, wherein an electrode insulating sleeve is additionally arranged at an electrode part in the packaging process to form the soft package battery. The soft package battery has the following structure:

The positive plate and the negative plate are arranged at intervals, a layer of diaphragm is arranged between the positive plate and the negative plate, the diaphragm is formed after heat sealing, the electrodes of the positive plate and the negative plate are separately bundled and led out to the outside, and the soft wrapping tape is made of high polymer resin materials with insulating property.

A process for manufacturing a soft package lithium battery,

Step one, preparing a positive plate and a negative plate for standby through coating and cutting,

Step two, preparing a diaphragm with the width being 1.2 times of the length of the positive plate and the negative plate for standby

step three, the first diaphragm is flatly laid on a continuously moving lower traction belt, meanwhile, the positive plates are uniformly placed on the first diaphragm in the middle, the positive plates are uniformly arranged at intervals manually or mechanically, the interval distance is kept at about 2 mm, and each side is reserved with 2 mm allowance,

step four, uniformly covering the second diaphragm on the first diaphragm to form full coverage on the positive plate, carrying out heat sealing on the diaphragm around the positive plate by using a heat sealing cutter, avoiding an electrode part in the heat sealing process, forming a continuous diaphragm belt after heat sealing, forming positive plates arranged at intervals in the diaphragm belt,

Step five, folding the diaphragm strip according to a Z-shaped mode, filling negative plates in the folding process, wherein the electrodes of the negative plates are overlapped, the electrodes on the positive plates are overlapped to form the appearance shown in figure 1,

Step six, binding the laminated sheets after finishing by using a diaphragm to form a square shape, putting the square shape into a soft bag,

Step seven, putting the soft bag into a liquid filling machine for pressing and finishing to form a regular shape, filling the electrolyte,

and step eight, performing heat sealing packaging after standing for 1 to 2 hours, removing the air inside through the exhaust holes in the soft packing tape after the heat sealing packaging, completely removing the air inside through multiple continuous liquid flushing and liquid discharging, and finally packaging the exhaust holes.

An electrolyte zero-air charging device, referring to fig. 21, comprises the following structure:

The device comprises an electric pump 101, an electrolyte storage tank 102, a filter 103 and a soft package battery clamping and vibrating mechanism 104, wherein the electric pump 101 is a liquid injection pump with a UBA (super Bay) brand model number of E2-R20B, the electric pump pumps electrolyte into the soft package battery, the electrolyte is filtered by the filter 103, the filter is of a double parallel structure, one device is used, the soft package battery clamping and vibrating mechanism comprises a vibrating platform 1041, a left reciprocating clamping plate 1042 and a right reciprocating clamping plate 1042, and a driving motor, a rocker arm 1043 is arranged below the vibrating platform 1041, the upper end of the rocker arm is arranged in the middle of the vibrating platform, the lower end of the rocker arm is arranged on a first eccentric wheel 1044, damping support rods 1045 are arranged at four corners of the vibrating platform, the damping support rods are telescopic rods with telescopic performance and elasticity, the first eccentric wheel is controlled by the driving motor, and under the rotation of the first eccentric wheel, the vibration platform is in a vibration state.

The revolving cylinder of left and right sides moves simultaneously when annotating the liquid, and revolving cylinder drives second eccentric wheel 1047, and the second eccentric wheel is through drive ejector pin 1046, and the ejector pin kick-backs under the effect of pressure spring, and the soft package is pressed from both sides tightly in reciprocating in unclamping, and this process is favorable to expiring of the bubble in the soft package 100, refers to fig. 22.

It is ensured that a circulation is maintained during the entire filling process, at least that no more air bubbles are driven out.

And then, plugging the air outlet of the soft bag in a heat seal mode to form permanent plugging.

a reinforced seal is arranged at the outer side of the soft package heat sealing position, and the formed soft package battery cell has the structure shown in fig. 23.

the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the scope of the present invention, and various modifications and improvements of the present invention may be made by those skilled in the art without departing from the spirit of the present invention as defined by the appended claims.

Claims

1. The manufacturing process of the soft package lithium battery core comprises a positive plate, a negative plate, diaphragms and a soft package shell, wherein the diaphragms comprise a first diaphragm (11 ') and a second diaphragm (12'), the positive plate (A) is arranged between the first diaphragm and the first diaphragm, the adjacent positive plates (A) are equidistant, the periphery of the positive plate is packaged in a heat sealing mode to form a diaphragm belt, the diaphragm belt is arranged in the soft package shell in a Z-shaped folding mode, and the negative plate is clamped between the two adjacent diaphragm belts; the positive plate is a discontinuous monomer, and the negative plate is a discontinuous monomer;

And be filled with electrolyte in soft packet of shell inside, its characterized in that carries out following step in order:

Step one, manufacturing a diaphragm strip

the method comprises the following steps that firstly, a first diaphragm releasing mechanism (11 ') releases a first diaphragm (11'), the first diaphragm (11 ') falls on a traction belt and is tiled, then positive plates are released through positive plate releasing parts, adjacent positive plates are arranged in an axisymmetric mode, then a second diaphragm (12') is released through a second diaphragm releasing mechanism (12), a positive plate (A) is packaged between the first diaphragm and the second diaphragm through the positive plate releasing parts, the distance between the adjacent positive plates (A) is controlled to be 2 mm through electric partition plate control, finally, a heat sealing mechanism is used for carrying out heat sealing on the periphery of the positive plate, the positive plates are fixed between two layers of diaphragms and are distributed discontinuously and uniformly to form a diaphragm belt;

Step two, lamination manufacturing

The diaphragm strip is subjected to Z-shaped continuous folding through a folding mechanism (73), negative plates (B) are released through a negative plate release part while the diaphragm strip is folded, the number of the negative plate release parts is two, the negative plates (B) are respectively released into the diaphragm strip from the front side and the rear side, the diaphragm strip is cut by a cutting device after the number of the positive plates is calculated, and finally, a lamination in which the diaphragm strip and the negative plates are orderly overlapped is formed through arrangement; step three, the lamination pre-installation is to put the lamination into a soft package shell, weld all the positive lugs on the positive plates into a whole, weld all the negative lugs on the negative plates into a whole, partially heat seal the soft package shell and leave a liquid filling port and a liquid outlet,

step four, filling the electrolyte and packaging the soft package shell

and continuously filling liquid into the soft package shell through an electrolyte filling device, replacing all internal air, and packaging the soft package shell in a heat sealing mode.

2. The manufacturing process according to claim 1, wherein the first membrane release mechanism (11) is composed of an unwinding roller (111), a tension roller (112) and a flattening roller (113), and the first membrane in a roll shape is positioned on the unwinding roller and naturally laid on the traction belt after passing through the tension roller and the flattening roller.

3. The process of claim 2, wherein the second membrane release mechanism has the same structure as the first membrane release mechanism.

4. The manufacturing process of claim 1, wherein the heat sealing mechanism comprises a cutter (31), a quadrilateral linkage mechanism (32) and a first air cylinder (33), wherein the cutter (31) is a rectangular frame, the heat sealing cutter is fixed in a heat sealing frame (34), an electric heating element for sealing the periphery of the positive pole piece is arranged in the heat sealing frame, a parallelogram linkage mechanism (32) is arranged on the upper side of the heat sealing frame (34), one end part of the parallelogram linkage mechanism extends outwards and is hinged with the frame, the parallelogram mechanism has a swinging action under the action of the first air cylinder (33), and in the swinging process, the heat sealing frame (34) is always in a horizontal state.

5. the manufacturing process of claim 1, wherein the electric partition comprises a partition, a control motor and a guide post, the thickness of the partition in the electric partition is set to be 2 mm, and the partition (72) has an up-and-down motion along the guide post under the drive of the control motor.

6. The manufacturing process of claim 1, wherein the folding mechanism (73) comprises a vertical plate (731), a connecting rod (732) and an electric linear push rod (733), wherein the lower end of the vertical plate (731) is pivoted on a rack device, the middle part and the upper part of the vertical plate (731) are respectively connected with the connecting rod in a hinged manner to form a parallelogram mechanism, and when the membrane strip in a vertical state is in place, the folding mechanism (73) acts to change the direction of the membrane strip and fold the membrane strip.

7. The manufacturing process according to claim 1, wherein the positive plate release part comprises a box body (91), a bottom plate (92), a lifting plate (93), a lifting mechanism (94) and a pushing mechanism (95), wherein the box body (91) is a rectangular ceramic box, the length of an inner cavity of the box body is 2 mm less than the length of the positive plate in the length direction, the positive plate (A) has the same width direction, and the positive plate (A) has the tendency of slightly protruding in the length direction after the positive plate is placed in the box body,

a pair of clamping grooves (911) are formed in an opening at the upper end of the box body (91), the two clamping grooves are oppositely arranged and fixed at the upper edge of the box body, and the edges of two sides of the positive plate (A) freely slide along the clamping grooves (911);

A top plate (912) is arranged at the upper end of the box body (91), the lower surface of the top plate (912) is an arc-shaped surface which is concave upwards, and the radian is the same as that of the jacking plate (93),

A first notch (913) which avoids an electrode leading-out port on the positive electrode is arranged in one of the clamping grooves (911), and a second notch (913') which avoids a positive electrode leading-out part is arranged on the box body (91);

The jacking plate (93) is an arc-shaped plate, a soft copper layer is arranged on the upper surface of the arc-shaped plate (93), guide columns (931) are arranged on the lower side of the arc-shaped plate, and teeth (932) are arranged on two sides of each guide column;

A bottom plate (92) is installed at the lower opening of the box body (91) in a hinged connection mode, the bottom plate can be opened and closed, a positive plate (A) is filled in the box body in the opening state, and the bottom plate is used for jacking the positive plate in the closing state; a round hole is formed in the middle of the bottom plate (92), the guide column penetrates through the round hole, another symmetrically-arranged gear (921) is mounted on the lower side of the bottom plate, the gear (921) is meshed with teeth (932) on the guide column, and the two gears are driven by a first servo motor (922) through a pair of reversely-arranged bevel gears (923);

The front side and the rear side of the clamping groove of the box body (91) are respectively provided with a first guide plate (901) and a second guide plate (901), the second guide plate (902) is provided with a push-out mechanism (95), the push-out mechanism comprises an air cylinder (951), a push-out plate (952) and a connecting frame (953), the push-out plate (952) is an alloy plate or a ceramic plate with the thickness equal to that of a positive plate, the front end of the push-out plate is inserted into the clamping groove (911), the rear end of the push-out plate is connected with a piston of the air cylinder through the connecting frame (953), and the air cylinder pushes the push-out plate to reciprocate.

8. the manufacturing process according to claim 7, wherein the positive electrode tab release portion and the negative electrode tab release portion have the same structure.