CN114284538A

CN114284538A - Manufacturing system and method of special-shaped three-dimensional battery cell

Info

Publication number: CN114284538A
Application number: CN202010977309.1A
Authority: CN
Inventors: 张继锋; 殷振国; 刘淼; 张艳萍; 唐成平; 徐言慧
Original assignee: Ray Tech International Ltd
Current assignee: Ray Tech International Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2022-04-05

Abstract

The invention discloses a manufacturing system and a method of a special-shaped three-dimensional battery cell, and relates to a manufacturing system and a method of a secondary battery. The method mainly comprises the steps of manufacturing a pole piece, manufacturing a diaphragm, stacking the pole piece, laminating and forming and the like; the system mainly comprises a positioning mechanism, a stacking mechanism and a transferring mechanism, and the battery core forming processing is automatically carried out with high precision. The invention can realize the completely personalized customized manufacture of the battery cell with any irregular shape, the negative plate is used as the outline shape of the battery cell, the maximization of the electric quantity of the battery cell can be realized, the positive plate can be completely clamped between two adjacent negative electrodes, the safe operation of the battery cell can be realized, the product consistency is high, the invention has the characteristic of high yield, the process is simple and efficient, the automatic manufacture of the battery cell can be realized, the yield of the special-shaped battery cell is effectively improved, and the problem of the space limitation of the battery on the market to the applied product is effectively solved.

Description

Manufacturing system and method of special-shaped three-dimensional battery cell

Technical Field

The invention relates to the field of secondary battery manufacturing systems and methods, in particular to a manufacturing system and a method of a special-shaped three-dimensional battery cell which can be used for manufacturing a soft package lithium ion battery with high energy density, high safety performance and strong shape plasticity.

Background

At present, secondary batteries, especially soft package lithium ion batteries, are widely used in various life electronic products, especially mobile phones, computers, wearable products, and the like, due to their large energy density, high safety performance, and strong shape plasticity. With the continuous application and popularization of secondary batteries in various electrical appliances, the batteries with standard shapes cannot meet the market demands in the past, such as wearable and life-type electronic products, the shapes of the batteries are often required to comply with the design requirements of the products and are limited by the space of the products, so that the personalized requirements are more and more, and batteries with irregular three-dimensional shapes, such as wearable equipment, are required to be used in many times.

In the prior art, most of secondary batteries are square blocks, cuboids or columns. Even when there is a profile battery, the profile battery is manufactured by stacking unipolar sheets having substantially the same size and shape into a columnar shape. However, the production of the irregular three-dimensional battery is rare and rare because the requirements of the battery performance are satisfied, and the safety performance of the battery, the efficiency and the cost of the battery production are satisfied.

Disclosure of Invention

The invention provides a system and a method for manufacturing a special-shaped three-dimensional battery core, which can realize high-efficiency low-cost and high-performance and safe secondary batteries manufactured by high-degree personalized customization.

In order to achieve the purpose, the invention adopts the following technical scheme:

a manufacturing system of a special-shaped three-dimensional battery cell comprises: the stacking mechanism comprises a positioning mechanism, a stacking mechanism and a transfer mechanism; the positioning mechanism is provided with a special-shaped die cavity at least partially enlarging the inner contour from bottom to top; the stacking mechanism comprises an anode placing position and a cathode placing position which are arranged on the stacking platform, the anode placing positions can be used for stacking and fixing anode plates with the same edge shape, and a plurality of anode placing positions are used for correspondingly stacking anode plates with different edge shapes; the negative electrode placing positions can stack negative plates with the same edge shape, and a plurality of negative electrode placing positions can correspondingly stack negative plates with different edge shapes; the transfer mechanism can alternately transfer the positive plate and the negative plate from the stacking mechanism to the special-shaped die cavity according to the edge shape expansion sequence.

The manufacturing system of the special-shaped three-dimensional battery cell further comprises a pole piece manufacturing machine, a bag manufacturing machine and a hot press. In order to realize electrode plate manufacturing, the electrode plate manufacturing machine manufactures the electrode plate into the positive electrode plate and the negative electrode plate with the set edge shape including the extension plate through cutting pieces and coating the positive electrode material and the negative electrode material. In order to realize that the battery cell is formed simply by stacking the positive and negative pole pieces without additionally stacking the diaphragms, the bag making machine wraps the upper surface and the lower surface of one of the positive and negative pole pieces in the two diaphragms. The hot press fixes the laminated positive and negative pole pieces into an integrated battery core through heating and pressurizing, so as to package the battery or the multi-battery-core combination. In order to realize the transfer of the pole pieces between the positioning mechanism and the stacking mechanism, the transfer mechanism comprises a mechanical gripper and a negative pressure suction head, and the mechanical gripper comprises a longitudinal driving part and a transverse driving part. Wherein, the transverse driving part is connected with the longitudinal driving part in a driving way, and the negative pressure suction head is connected with the transverse driving part in a driving way.

In the above manufacturing system, preferably, the stacking platform includes an anode platform and a cathode platform, each anode placing position is arranged on the anode platform, and the cathode placing positions are respectively located on the cathode platform; or, each positive electrode placing position and each negative electrode placing position are arranged on one stacking platform in a stacking sequence. The arrangement mode of the anode placing positions and the cathode placing positions can be various, the anode placing positions and the cathode placing positions are respectively arranged to increase efficiency and save space, and the anode placing positions and the cathode placing positions are arranged on a stacking platform to save the stroke of a transfer mechanism.

In the above manufacturing system, it is preferable that the stacking mechanism is connected to a driving device for moving each of the positive electrode placing position and the negative electrode placing position to the transfer mechanism pole piece taking-out position in the stacking order. The scheme has the beneficial effects that the positive electrode placing position and the negative electrode placing position can be sequentially driven to be close to the transfer mechanism alternately, the lamination time is shortened, and the processing efficiency of the special-shaped battery core is increased.

In the above manufacturing system, preferably, the positive electrode placing locations are positive electrode troughs arranged in a circular shape on the positive electrode platform, and the negative electrode placing locations are negative electrode troughs arranged in a circular shape on the negative electrode platform. If the positive electrode plate taking mechanism is provided with a driving device, the positive electrode platform and the negative electrode platform can be respectively and independently connected with the driving device, so that the positive electrode platform and the negative electrode platform can alternatively rotate and drive the positive electrode material groove and the negative electrode material groove to respectively rotate to the positive electrode plate taking position and the negative electrode plate taking position of the transfer mechanism. This scheme beneficial effect lies in, and the position is placed to anodal position and the position is placed to the negative pole and has the turnover motion respectively, has the drive simply, and the operation is comparatively stable, advantage that the conveying precision is high.

Preferably, the positive electrode placing position is a positive electrode trough linearly arranged on the positive electrode platform, the negative electrode placing position is a negative electrode trough linearly arranged on the negative electrode platform, and if the manufacturing system is provided with a driving device, the positive electrode platform and the negative electrode platform can be respectively and independently connected with the driving device, so that the positive electrode platform and the negative electrode platform are alternately and linearly arranged and drive the positive electrode trough and the negative electrode trough to respectively rotate to the positive electrode taking position and the negative electrode taking position of the transfer mechanism. This scheme beneficial effect lies in, and the position is placed to anodal position and the position linear motion respectively is placed to the negative pole, has the drive simply, and the operation is comparatively stable, advantage that the conveying precision is high.

In the above manufacturing system, specifically, the positive electrode placing groove is arranged on the stacking platform, and has a shape matching with the edge of the positive electrode sheet placed thereon; the negative pole is placed the position and is set up on the platform is put things in good order, and it has and places negative pole piece edge shape phase-match.

In the above manufacturing system, preferably, a first opening for positioning the anode protruding piece is provided at a lateral outer edge of each anode placing position, and a second opening for positioning the cathode protruding piece is provided at a lateral outer edge of each cathode placing position; the anode placing positions and the cathode placing positions are respectively arranged in a circular shape, and the first openings and the second openings are arranged centripetally or in a vest shape; or the anode placing positions and the cathode placing positions are respectively arranged in a linear shape, the first openings are arranged in parallel towards the same direction, and the second openings are arranged in parallel towards the same direction. The scheme has the beneficial effects that the extending pieces of the positive and negative pole pieces can be connected in the same direction by transferring in a translation mode without rotating the pole pieces.

Preferably, the manufacturing system includes that a first positioning groove for fixing each positive electrode extending piece and a second positioning groove for fixing each negative electrode extending piece are respectively arranged at the outer edge of the side portion of the special-shaped mold cavity, the first positioning groove and the second positioning groove are arranged at an included angle, and the included angle is 0-180 degrees. The scheme has the beneficial effect that the flexible arrangement of the anode and cathode lugs of the battery can be realized.

A manufacturing method of a special-shaped three-dimensional battery cell comprises the following steps:

manufacturing a pole piece, namely manufacturing a positive pole piece and a negative pole piece with different edge shapes; in the step of manufacturing the pole pieces, any two adjacent negative pole pieces with edge shape enlarging sequence are provided, wherein the edge of one negative pole piece can completely cover the edge of the other negative pole piece, and each negative pole piece forms the outline of the special-shaped three-dimensional battery cell; the edge of any positive plate is completely wrapped in the edges of the negative plates on the two sides of the positive plate;

preparing a diaphragm, wherein the upper surface and the lower surface of one of each positive plate or each negative plate are wrapped between two diaphragms to form a pole piece wrapped with the diaphragm, and the other of the positive plate or each negative plate is an unwrapped pole piece;

stacking the pole pieces, namely stacking the positive pole pieces with the same edge shape on the same placement position, and stacking the negative pole pieces with the same edge shape on the same placement position, wherein the number of the placement positions is at least equal to the sum of the numbers of the positive pole pieces and the negative pole pieces with different edge shapes;

and (3) laminating, namely transferring the pole pieces wrapped with the diaphragm and the pole pieces not wrapped in the diaphragm into a special-shaped die cavity matched with the outer contour of the manufactured battery cell in sequence and alternately, expanding the inner contour of at least part of the special-shaped die cavity along the laminating direction, and positioning the positive pole piece and the negative pole piece according to the edge shape expanding sequence to form the special-shaped three-dimensional shape of the battery cell.

In the above manufacturing method, preferably, the edge shape of any one of the negative electrode sheets is a cross-sectional edge shape corresponding to the height of the special-shaped three-dimensional body in which the negative electrode sheet is located, the positive electrode sheet adjacent to the negative electrode sheet is reduced by the edge shape according to a set proportion, and the special-shaped mold cavity positions the negative electrode sheets in order of the expansion of the edge shape. The scheme has the beneficial effects that the effective power storage area of the battery cell is increased under the condition that the safety of the special-shaped structure battery is ensured. More specifically, each negative electrode sheet is in a similar pattern, two adjacent negative electrode sheets are randomly stacked, the edge proportion of one negative electrode sheet is greater than that of the other negative electrode sheet, the negative electrode sheets are stacked to form a special-shaped three-dimensional shape with the edge shape expanded in the similar pattern, the edge shape of the diaphragm can completely cover the positive electrode sheet and the negative electrode adjacent to the diaphragm, the negative electrode sheets are stacked to form the special-shaped three-dimensional shape with the outer contour gradually expanded in a proportional manner by expanding similar polygons, similar circles and the like, and the expanded range of the electrode sheets is convenient to set.

In the above manufacturing method, preferably, in the step of stacking the pole pieces, the placing positions for placing the positive pole pieces and the placing positions for placing the negative pole pieces are respectively arranged in a circular or linear shape, and are moved to the positive pole piece suction point by rotation corresponding to the circular arrangement or translation corresponding to the linear arrangement, and are transferred to the special-shaped mold cavity from the suction point by a mechanical gripper suction manner. This scheme beneficial effect lies in, through the removal of placing the position, reduces the removal scope of mechanical tongs, shortens the lamination time, increases electric core machining efficiency.

Preferably, after the stacking step, the cell is subjected to a hot pressing process to fix the positive and negative electrode sheets, the fixed cell is connected to the positive and negative electrode tabs of the battery, the cell is packaged in the battery shell and filled with an electrolyte to form the battery, and the ends of more than two batteries formed by the special-shaped cells in the stacking direction are connected with each other and correspondingly connected to form the battery with the contour gradually changing in the inner and outer directions. The scheme has the beneficial effects that the battery is assembled by the electric core with the unidirectional increase, and then the plurality of special-shaped batteries are connected to form the battery packs with various shapes.

Preferably, in the above manufacturing method, the step of manufacturing the pole pieces includes that the positive pole piece and the negative pole piece are respectively integrally cut to form protruding pieces protruding from edges of the pole pieces, and the protruding pieces of the positive pole piece and the negative pole piece on the lower layer are both arranged in the stacking direction, and the protruding length of the protruding piece of the positive pole piece and the protruding piece of the negative pole piece on the lower layer is greater than or equal to that of the protruding piece of the battery cell unit on the upper layer, so that the protruding pieces of each pole piece in the battery cell forming the special-shaped three-dimensional shape are electrically connected to one end with a larger battery cell outline. The beneficial effects of the scheme are that the extension piece of the small-size pole piece is longer, the convenient grabbing and positioning are realized, meanwhile, the extension piece of each pole piece is welded at the end with the larger outline, and the pole ear of the epitaxial battery is more stable.

In the above manufacturing method, preferably, the step of manufacturing the pole pieces includes that the manufacturing number of the negative pole pieces is one more than that of the positive pole pieces, and the two sides of each of the positive pole pieces and the negative pole pieces are coated with corresponding polar materials; or the number of the positive plates or the negative plates is the same, the positive plates and the negative plates at the top layer and the bottom layer of the battery core are respectively coated with the polar materials in a single layer, and the other two layers are coated with the polar materials. The scheme has the beneficial effects that the process can be simplified by unifying the double-sided coating, the materials can be reduced by the top-bottom single-sided coating, the effective utilization space of the battery is increased, and the battery capacity is enlarged.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the method for manufacturing the battery cell, the positive and negative plates are manufactured into different edge shapes to serve as the basis of the special-shaped structure of the battery cell, the positive and negative plates are wrapped with the diaphragm through bag making, the pole plates with the same specification are respectively stacked, and finally the positive and negative plates are alternately stacked in the special-shaped cavity in sequence and fixed for positioning, so that the special-shaped battery cell can be manufactured. The method can realize completely personalized customized manufacture of the battery cell with any irregular shape, the manufactured battery cell can be used as the outline model of the battery cell through the negative pole piece, the maximization of the electric quantity of the battery cell can be realized, and the battery cell can be completely clamped between two adjacent negative poles through the positive pole piece, so that the safe operation of the battery cell can be realized; and the product consistency is high, the characteristics of high yields are achieved, the process is simple and efficient, automatic battery core manufacturing can be realized, and the problem that the battery in the market is limited by the space of the applied product is effectively solved.

(2) In the cell manufacturing system, the positive and negative plates with the same specification can be respectively stacked, taken out according to the stacking sequence through the transfer mechanism and placed in the special-shaped die cavity for realizing the cell shape shaping effect, so that the cell with any irregular shape can be completely manufactured in a personalized and customized manner, and the cell manufacturing system has the characteristics of automation, flow and high precision, and effectively improves the yield of the special-shaped cell.

The invention will be further described with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of a cross-sectional structure of a stacked cell according to the system and method of the present invention;

figure 2 is a schematic diagram of a stacked cell partial explosion configuration under the system and method of the present invention;

fig. 3 is a schematic perspective view of a linear battery cell manufacturing system according to the present invention;

fig. 4 is a schematic perspective view of a circular battery cell manufacturing system according to the present invention;

fig. 5 is a schematic sectional view of a secondary battery manufactured from the battery cell of the present invention;

fig. 6 is a schematic perspective view of a secondary battery fabricated from the battery cell of the present invention;

fig. 7 is a schematic sectional view illustrating a secondary battery having assembled cells according to the present invention;

fig. 8 is a schematic perspective view of a secondary battery having a combined cell according to the present invention.

The reference signs are: the battery comprises a battery core 1, a positive plate 101, a negative plate 102, a diaphragm 103, a stretching plate 104, a battery shell 2, a tab 21, a positioning mechanism 3, a special-shaped mold cavity 31, a first opening 32, a second opening 33, a mechanical gripper 41, a negative pressure suction head 42, a positive material groove 51, a negative material groove 52, a positive material platform 53, a negative material platform 54, a first positioning groove 56, a second positioning groove 57, a second battery core 1a and a second shell 2 a.

Detailed Description

To better illustrate the objects, technical solutions and advantages of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 2, the cell manufacturing system and method of the present invention can be manufactured exemplarily, and can be used for manufacturing at least a cell 1 with an outline increasing from one end to the other end, specifically, the cell 1 is a specially-shaped cell 1 formed by sequentially and alternately stacking positive and negative electrode sheets and a diaphragm 103, which are sequentially stacked, to form a regular quadrangular pyramid, or other specially-shaped cells 1 connected in a multi-pyramid, a truncated cone, a hemisphere, a semi-ellipsoid, or the above-mentioned three-dimensional shape.

As shown in fig. 1 to 4, the method for manufacturing a special-shaped three-dimensional battery cell according to the present invention, which can embody the characteristics of the battery cell manufacturing system according to the present invention, includes the following specific processing steps:

first, a pole piece is manufactured. Referring to fig. 1 and 2, the pole piece manufacturing step specifically includes that each of the positive pole piece 101 and the negative pole piece 102 is formed by cutting the electrode material coated with the polar material on both sides into a square shape. The positive electrode sheets 101 have the same thickness and the negative electrode sheets 102 have the same thickness, which is convenient for manufacturing. The edge shape of a certain layer of negative plate 102 is the edge shape of the position of which the stacking height H corresponds to the set special-shaped three-dimensional shape, namely the section shape of the positive quadrangular pyramid, and the stacking height can be equal to the sum of the thickness of the positive plate 101 of each wrapping membrane below the negative plate and the thickness of each negative plate 102, and the sum of the number of the separation membranes 103 and the thickness of the separation membranes 103 is multiplied by the thickness of the separation membranes 103. In one cell 1, each negative plate 102 has a similar square edge shape. In the stacking direction, the side length ratio of the lower-layer negative electrode sheet 102 is greater than that of the upper-layer negative electrode sheet 102. Each positive plate 101 is also similar to a square edge shape, the size ratio of each positive plate 101 meets the characteristic that the upper layer is larger than or equal to the lower layer, and mainly, the ratio of the positive plate 101 is smaller than that of the two adjacent negative plates 102. The negative electrode tab 102 has 7 edge shapes, the positive electrode tab 101 has 6 edge shapes, and the negative electrode tab 102 has one more layer than the positive electrode tab 101. Each positive electrode sheet and each negative electrode sheet are integrally provided with a protruding sheet 104 protruding from the edge of the electrode sheet, the protruding length of the protruding sheet 104 of the positive electrode sheet 101 and the protruding sheet 104 of the negative electrode sheet 102 on the lower layer is greater than or equal to that of the protruding sheet 104 of the cell 1 unit on the upper layer, the length of the positive electrode protruding sheet 104 on the bottom layer is enough to be connected to the positive electrode protruding sheet 104 on the top layer through bending, and similarly, the length of the negative electrode protruding sheet 104 on the bottom layer is enough to be connected to the negative electrode protruding sheet 104 on the top layer through bending.

Then, the diaphragm 103 is manufactured. Referring to fig. 2, the upper and lower surfaces of each positive electrode sheet 101 are wrapped between two separators 103 by a bag-making method, and the negative electrode sheet 102 is not wrapped around the separator 103. The separator 103 is also square-edge shaped, and has a larger proportion than the adjacent negative electrode sheet 102, and the proportion increases in the stacking direction. Since the flexibility of the diaphragm 103 does not affect the modeling structure of the battery cell 1, the diaphragm 103 protrudes to increase the electrolyte capacity.

Then, the pole pieces are stacked. Referring to fig. 3 and 4, a plurality of positive plates 101 with the same edge shape are stacked at the same placement position, a plurality of negative plates 102 with the same edge shape are stacked at the same placement position, and the number of the placement positions is equal to the sum of the numbers of the positive plates 101 with different specifications and the negative plates 102 with different specifications, namely, 7 negative electrode placement positions and 6 positive electrode placement positions.

And finally, stacking. Referring to fig. 1 to 4, the negative electrode placing positions and the positive electrode placing positions are respectively arranged in a circular or linear arrangement and can be sequentially moved to the suction point, and are transferred from the suction point to the special-shaped mold cavity 31 by means of suction by the mechanical gripper 41. If the negative electrode placing positions linearly arranged on one side are advanced by one stroke, the mechanical gripper 41 moves to the side suction point, then sucks the negative electrode piece 102 and moves to the special-shaped mold cavity 31 for placing, and the positive electrode placing positions linearly arranged on the other side are advanced by one stroke, the mechanical gripper 41 moves to the positive electrode side suction point, then sucks the positive electrode piece 101 and moves to the special-shaped mold cavity 31 for placing, and the lamination is completed sequentially in a circulating mode.

In the manufacturing of a special-shaped battery, after the lamination step, as shown in fig. 5 to 6, the battery core 1 is subjected to a hot pressing process to fix the positive and negative electrode sheets, the fixed battery core 1 is connected to the positive and negative electrode tabs 21 of the battery, and then the battery core is packaged in the battery shell 2 and filled with an electrolyte to form the rechargeable lithium ion battery with a regular rectangular pyramid shape.

In the manufacturing of another special-shaped battery, after the stacking step, as shown in fig. 7 to 8, the cell is subjected to a hot pressing process to fix the positive and negative electrode sheets, the fixed cell is connected to the positive and negative electrode tabs of the battery, and then the cell is packaged in the battery shell and filled with the electrolyte to form the battery. A second battery cell 1a and a second casing 2a are also provided. The battery cell 1 is packaged in the battery shell 1, the second battery cell 1a is packaged in the second shell 2a, the battery shell 2 is connected with the bottom of the second shell 2a, and the positive electrode lug and the negative electrode lug are correspondingly connected to form a battery with the outline gradually changing in the inner direction and the outer direction in multiple directions.

As shown in fig. 3 and 4, in order to embody the characteristics of the method for manufacturing a battery cell according to the present invention, the present invention provides a system for manufacturing a special-shaped three-dimensional battery cell, including: the device comprises a pole piece making machine, a bag making machine, a stacking mechanism, a transfer mechanism, a positioning mechanism 3 and a hot press, wherein the positioning mechanism 3 is used for positioning each positive pole piece and each negative pole piece to form the profile of the special-shaped three-dimensional electric core 1, a special-shaped mold cavity 31 with the bottom expanded towards the inner profile is arranged on an entity, the top of the special-shaped mold cavity 31 is opened, the pole pieces are placed into the special-shaped mold cavity 31 from the opening, and the positive pole pieces and the negative pole pieces with different edge shapes are sequentially and alternately stacked from the bottom to the top. The stacking mechanism is provided with anode placing positions and cathode placing positions, the anode placing positions can be used for stacking and fixing the anode plates 101 with the same edge shape, and the anode placing positions are used for correspondingly stacking the anode plates 101 with different edge shapes; the negative electrode placing positions can stack the negative electrode pieces 102 with the same edge shape, and the negative electrode placing positions can correspondingly stack the negative electrode pieces 102 with different edge shapes; the transfer mechanism may alternately transfer the positive electrode tab 101 and the negative electrode tab 102 from the stacking mechanism to the special-shaped cavity 31 in order of the expansion of the edge shape. In addition, the pole piece making machine is used for making the positive pole piece and the negative pole piece with the set edge shape comprising the extending pieces 104 by coating the positive pole material and the negative pole material and cutting and molding the pole piece material; the bag making machine packages each positive plate 101 between the upper and lower diaphragms 103, and the hot press fixes the laminated positive and negative plates into an integrated battery core 1 by heating and pressurizing, so as to package the battery or the combination of multiple battery cores 1. In particular, the transfer mechanism comprises a mechanical gripper 41 and a suction head 42. The mechanical gripper 41 includes a longitudinal driving portion and a lateral driving portion. Wherein the transverse driving part is connected with the longitudinal driving part in a driving way, and the negative pressure suction head 42 is connected with the transverse driving part in a driving way.

Referring to fig. 3 and 4, in the present embodiment, the positive electrode placing positions and the negative electrode placing positions are respectively arranged on two bases, including a positive electrode platform 53 and a negative electrode platform 54. The driving mechanism is independently connected to the positive electrode platform 53 and the negative electrode platform 54 so as to enable the positive electrode placing position and the negative electrode placing position to move to the electrode piece taking-out point in sequence. The mechanical gripper 41 performs a transfer movement between the take-out point and the special-shaped mold cavity 31, and grips the positive and negative electrode sheets in a vacuum suction manner. In other embodiments, it is understood that the stacking mechanism may be arranged such that the positive electrode positions and the negative electrode positions are alternately arranged on a base from small to large.

In fig. 3, in another embodiment of the manufacturing system, specifically, the positive electrode placing positions are positive electrode troughs 51 circularly arranged on a positive electrode platform 53, the negative electrode placing positions are negative electrode troughs 52 circularly arranged on a negative electrode platform 54, and the driving mechanisms are independently and rotatably connected to the positive electrode platform 53 and the negative electrode platform 54 and drive the positive electrode placing positions and the negative electrode placing positions to rotate respectively. In this embodiment, the first positioning slot 56 and the second positioning slot 57 are arranged at an angle of 180 degrees. The positive electrode placing positions and the negative electrode placing positions are arranged in a linear shape, the first openings 32 are arranged in parallel to each other toward the left side, and the second openings 33 are arranged in parallel to each other toward the upper side. Through the translational motion, the mechanical gripper 41 can transport the pole piece, and correspondingly place the pole piece in the special-shaped mold cavity 31, and the positive and negative extending pieces 104 are matched with the positioning grooves and form an included angle of 180 degrees. Through adjusting the relative orientation of first opening 32 and second opening 33 to and adjust first constant head tank 56 and second constant head tank 57 contained angle, can realize adjusting the contained angle between electric core 1 just, negative pole utmost point ear 21.

In fig. 4, one embodiment of the manufacturing system specifically includes 6 positive electrode placing locations circularly arranged on a positive electrode platform 53. The cathode placement sites have 7 cathode bins 52 arranged in a circular pattern on a cathode platform 54. Corresponding to the fixed positive and negative electrode extending pieces 104, the lateral outer edge of each positive electrode placing position is provided with a first opening 32 for positioning the positive electrode extending piece 104, and the lateral outer edge of each negative electrode placing position is provided with a second opening 33 for positioning the negative electrode extending piece 104. Each of the first opening 32 and the second opening 33 is concentrically disposed. Corresponding to each positive electrode extending piece 104 and each negative electrode extending piece 104 in the fixed electric core 1, a first positioning groove 56 for fixing each positive electrode extending piece 104 and a second positioning groove 57 for fixing each negative electrode extending piece 104 are respectively arranged at the outer edge of the side part of the special-shaped mold cavity 31, the first positioning groove 56 and the second positioning groove 57 are arranged at an included angle, and the included angle is 180 degrees. Taking the rightmost end of the positive electrode platform 53 as a positive electrode sheet 101 taking point and the leftmost end of the negative electrode platform 54 as a negative electrode sheet 102 taking point, the pole pieces can be correspondingly placed in the special-shaped die cavities 31 by horizontally conveying the pole pieces, and the positive and negative electrode extending sheets 104 are matched with the positioning grooves to form an included angle of 180 degrees. The taking-out point on one side is unchanged, and the included angle between the positive electrode lug 21 and the negative electrode lug 21 of the battery cell 1 can be adjusted by adjusting the taking-out point on the other side and correspondingly adjusting the included angle between the first positioning groove 56 and the second positioning groove 57. And (4) a mechanical gripper.

Taking the above circular arrangement embodiment as an example, the operation steps of the cell manufacturing system described in the present invention are specifically as follows:

1. preparing a die with a special-shaped die cavity 31 which can be used as a positioning mechanism 3, wherein the die is provided with a special-shaped cavity with an upward opening and an inverted regular rectangular pyramid, and a first positioning groove 56 and a second positioning groove 57 are arranged on the outer edge in different directions; manufacturing a conveying mechanism, namely arranging a mechanical gripper 41 and manufacturing a negative pressure suction head 42 capable of sucking pole pieces with various shapes and specifications; the mechanism is put things in good order in preparation, including anodal platform 53 and negative pole platform 54 promptly, wherein anodal platform 53 has processed 6 anodal silo 51 that correspond the positive plate 101 edge shape of each specification, wherein negative pole platform 54 has processed 7 negative pole silos 52 that correspond the positive plate 101 edge shape of each specification, wherein anodal platform 53 and negative pole platform 54 are the rotary driving mechanism of independently connecting separately, each anodal silo 51 all is equipped with the first opening 32 of same orientation, each negative pole silo 52 all is provided with the second opening 33 of same orientation in addition.

2. The positive and negative plates with special-shaped three-dimensional shapes are prepared by a plate making machine.

3. The positive electrode and the separator 103 were formed into a positive electrode pouch by a pouch-making machine.

4. A plurality of positive and negative plates with the same edge shape are correspondingly stacked in the positive material groove 51 and the negative material groove 52.

5. And starting to manufacture, moving the mechanical hand grip 41 to a suction point on one side of the negative electrode platform 54, sucking one negative electrode sheet 102 in the negative electrode trough 52 with the smallest proportion by 1, and putting the negative electrode sheet into the special-shaped die cavity 31.

6. Then, the mechanical gripper 41 moves to the suction point on one side of the positive electrode platform 53, sucks the positive electrode sheet 101 wrapped with the diaphragm 103 in the 1 st positive electrode trough 51 with the minimum proportion and puts the positive electrode sheet into the lamination trough, namely above the 1 st negative electrode sheet 102, and meanwhile, the negative electrode platform 54 rotates by a set angle to enable the other negative electrode trough 52 to replace the position of the original negative electrode trough 52

7. Then, the negative mechanical gripper 41 moves to a suction point on one side of the negative platform 54 to suck the 2 nd negative material groove 52 with a smaller proportion, and one negative plate 102 inside is placed in the lamination groove.

8. And repeating the process of alternately and sequentially stacking the positive and negative electrode plates until the plates in the N positive electrode material grooves 51 and the N +1 negative electrode material grooves 52 are respectively taken one plate, and finishing the stacking. And transferring the lamination groove to a hot press for hot press molding, and finishing the manufacture of the regular rectangular pyramid lamination battery core.

The foregoing embodiments have been described primarily for the purposes of illustrating the general principles, and features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a manufacturing system of three-dimensional electric core of abnormal shape which characterized in that includes: a positioning mechanism (3), a stacking mechanism and a transfer mechanism,

the positioning mechanism (3) is provided with a special-shaped die cavity (31) which is enlarged from bottom to outside and at least partially enlarges the inner contour;

the stacking mechanism comprises an anode placing position and a cathode placing position which are arranged on the stacking platform, the anode placing positions can be used for stacking and fixing anode plates (101) with the same edge shape, and a plurality of anode placing positions correspondingly stack anode plates (101) with different edge shapes; the negative electrode placing positions can stack negative electrode sheets (102) with the same edge shape, and a plurality of negative electrode placing positions can correspondingly stack negative electrode sheets (102) with different edge shapes;

the transfer mechanism can alternately transfer the positive electrode sheets (101) and the negative electrode sheets (102) from the stacking mechanism to the special-shaped mold cavity (31) according to the edge shape expansion sequence.

2. The system for manufacturing the heterotype three-dimensional battery cell according to claim 1, wherein the stacking platform comprises a positive platform (53) and a negative platform (54), each positive placement position is arranged on the positive platform (53), and each negative placement position is respectively arranged on the negative platform (54); or, each positive electrode placing position and each negative electrode placing position are arranged on one stacking platform in a stacking sequence.

3. The system for manufacturing the heterotype three-dimensional battery cell according to claim 2, wherein the positive electrode placing positions are positive electrode troughs (51) circularly arranged on a positive electrode platform (53), and the negative electrode placing positions are negative electrode troughs (52) circularly arranged on a negative electrode platform (54); or the positive electrode placing positions are positive electrode material grooves (51) which are linearly arranged on a positive electrode platform (53), and the negative electrode placing positions are negative electrode material grooves (52) which are linearly arranged on a negative electrode platform (54).

4. The system for manufacturing the heterotype three-dimensional battery core according to claim 2 or 3, wherein the stacking mechanism is connected with a driving device to move each of the positive electrode placing position and the negative electrode placing position to the transfer mechanism pole piece taking-out position in a stacking order.

5. The system for manufacturing the heterotype three-dimensional battery cell according to claim 1 or 2, wherein the positive electrode placing position is a positive electrode placing groove which is arranged on the solid body and has a shape matched with the edge shape of the positive electrode sheet (101) placed on the positive electrode placing position, and the negative electrode placing position is a negative electrode placing groove which is arranged on the solid body and has a shape matched with the edge shape of the negative electrode sheet (102) placed on the negative electrode placing position.

6. The system for manufacturing the heterotype three-dimensional battery cell according to claim 1, wherein the lateral outer edge of each positive electrode placing position is provided with a first opening (32) for positioning a positive electrode extending sheet (104), and the lateral outer edge of each negative electrode placing position is provided with a second opening (33) for positioning a negative electrode extending sheet (104);

the anode placing positions and the cathode placing positions are respectively arranged in a circular shape, and the first openings (32) and the second openings (33) are arranged centripetally or in a vest mode; alternatively, the first and second electrodes may be,

the positive electrode placing positions and the negative electrode placing positions are arranged in a linear mode respectively, the first openings (32) are arranged in parallel in the same direction, and the second openings (33) are arranged in parallel in the same direction.

7. The system for manufacturing the special-shaped three-dimensional battery cell according to claim 6, wherein a first positioning groove (56) for fixing each positive electrode protruding piece (104) and a second positioning groove (57) for fixing each negative electrode protruding piece (104) are respectively arranged at the outer edge of the side portion of the special-shaped mold cavity (31), the first positioning groove (56) and the second positioning groove (57) are arranged at an included angle, and the included angle is 0-180 °.

8. A manufacturing method of a special-shaped three-dimensional battery cell is characterized by comprising the following steps:

manufacturing a pole piece, namely manufacturing a positive pole piece (101) and a negative pole piece (102) with different edge shapes;

preparing a diaphragm (103), wrapping the upper surface and the lower surface of one of each positive plate (101) or each negative plate (102) between the two diaphragms (103) to form a pole piece wrapped with the diaphragm (103), wherein the other of the positive plate (101) or each negative plate (102) is an unwrapped pole piece;

stacking the pole pieces, namely stacking the positive pole pieces (101) with the same edge shape at the same placement position, and stacking the negative pole pieces (102) with the same edge shape at the same placement position, wherein the number of the placement positions is at least equal to the sum of the numbers of the positive pole pieces (101) and the negative pole pieces (102) with different edge shapes;

and (2) laminating, namely transferring and laminating the pole pieces wrapped with the diaphragm (103) and the pole pieces not wrapped in the diaphragm into a special-shaped die cavity (31) matched with the outer contour of the prepared electric core (1) in sequence alternately, expanding the inner contour of at least part of the special-shaped die cavity (31) along the laminating direction, and positioning the positive pole piece and the negative pole piece according to the expanding sequence of the edge shape to form the special-shaped three-dimensional shape of the electric core (1).

9. The method for manufacturing the special-shaped three-dimensional battery cell according to claim 8, wherein in the step of manufacturing the pole pieces, any two adjacent negative pole pieces (102) with edge shape enlarging order are provided, wherein the edge of one negative pole piece (102) can completely cover the edge of the other negative pole piece (102), and each negative pole piece (102) forms the outer contour of the special-shaped three-dimensional battery cell (1); the edge of any positive plate (101) is completely wrapped in the edges of the negative plates (102) at the two sides of the positive plate; preferably, the edge shape of any negative plate (102) is a cross-sectional edge shape corresponding to the height of the special-shaped solid, the positive plate (101) adjacent to the negative plate (102) is reduced by the edge shape according to a set proportion, and the special-shaped mold cavity (31) positions the negative plates (102) in the order of expansion of the edge shape.

10. The method for manufacturing the special-shaped three-dimensional battery cell according to claim 8, wherein in the step of pole piece stacking, the placing positions for placing the positive pole piece (101) and the placing positions for placing the negative pole piece (102) are respectively arranged in a circular or linear shape, and are moved to the sucking point of the positive pole piece (101) through rotation corresponding to the circular arrangement or translation corresponding to the linear arrangement, and are transferred from the sucking point to the special-shaped mold cavity (31) through a mechanical hand (41) sucking mode.

11. The method for manufacturing the special-shaped three-dimensional battery core according to claim 8, wherein after the stacking step, the battery core (1) is subjected to hot pressing to fix the positive and negative electrode sheets, the fixed battery core (1) is connected with the positive and negative electrode tabs (21) of the battery, the battery core (1) is packaged in the battery shell (2) and is filled with electrolyte to form the battery, and the ends of more than two batteries formed by the special-shaped battery cores (1) in the stacking direction are connected with each other and the positive and negative electrode tabs (21) are correspondingly connected to form the battery with the gradually-changed outline in the inner and outer directions.

12. The method for manufacturing the heterotype three-dimensional battery cell according to claim 8, wherein the step of manufacturing the pole pieces includes that the positive pole piece (101) and the negative pole piece (102) are respectively integrally cut to form protruding pieces (104) protruding from edges of the pole pieces, the protruding pieces (104) of the positive pole piece (101) and the negative pole piece (102) in the lower layer are both in the stacking direction, and have a protruding length greater than or equal to that of the protruding piece (104) in the upper layer battery cell (1), and the protruding pieces (104) of each pole piece in the heterotype three-dimensional battery cell (1) are electrically connected to one end of the battery cell (1) with a larger outline.

13. The method for manufacturing the heterotype three-dimensional battery cell according to claim 8, wherein the step of manufacturing the pole pieces comprises that the number of the negative pole pieces (102) is one more than that of the positive pole pieces (101), and the positive pole pieces (101) and the negative pole pieces (102) are coated with corresponding polar materials on both sides; or the number of the positive plates (101) or the negative plates (102) is the same, the positive plates (101) and the negative plates (102) on the top layer and the bottom layer of the battery core (1) are respectively coated with a polar material in a single layer, and the rest two layers are coated with polar materials.