An encapsulation device for a lithium battery

Abstract

An encapsulation device for a lithium battery according to the present invention has a rectangular overall shape and successively includes a lower die base, an upper die base, at least one set of plates, an upper cover plate and screws from bottom to top. The lower die base is open at the top, surrounded by the surrounding walls and the bottom surface, and has a first rectangular concave area in the middle. The upper edge of the first rectangular concave area forms a second rectangular concave area along the four sides with the upper ends of the surrounding walls. A third rectangular groove is provided at the center of each of the four sides of the second rectangular concave area, and a fourth rectangular groove is provided outside the upper end of the surrounding wall near each third rectangular groove. At least two upward protruding columns are provided at the upper ends of the two long walls of the lower die base. At the upper part of a left corner of the lower die base, a semi-circular pipe groove is provided from near the corner end to the upper end of the left corner of the first rectangular concave area. This solution can ensure that each side of the outer package of the encapsulated lithium battery is uniformly stressed and has a uniform thickness after hot pressing encapsulation, with good sealing performance, good product consistency and high qualified rate, and improves the production efficiency of the lithium battery with four electrodes.

Description

Technical Field

[0001] The present invention relates to the field of battery manufacturing, and particularly to a packaging device for a lithium battery. Background Art

[0002] The electrodes of existing lithium batteries are divided into positive and negative electrodes, and there are two setting types: one is set at the same end of the lithium battery, and the other is set at opposite ends of the lithium battery. For such two types of lithium batteries, there are respective mature packaging processes and supporting packaging devices.

[0003] However, for the deficiencies of existing two-electrode lithium batteries, such as when the capacity of the lithium battery is large and the load is heavy, during the charging or discharging process, a large amount of heat is generated, causing the temperature of the lithium battery to rise, which affects the use and performance of the battery. On the other hand, the positive and negative electrodes of most lithium batteries are arranged in parallel on the same side, and this structure has a hidden danger of short circuit between the positive and negative electrodes during production or use, resulting in battery failure and even explosion danger. Therefore, we have invented a lithium battery structure design with four electrodes. Due to the structural differences, the existing packaging processes and packaging devices cannot meet the production and processing requirements of four-electrode lithium battery products. After repeated exploration and research, we have invented a packaging device for a lithium battery. Summary of the Invention

[0004] The object of the present invention is to solve the problem that the existing lithium battery packaging processes and packaging devices cannot meet the production and processing requirements of four-electrode lithium battery products, and its specific solutions are as follows:

[0005] A packaging device for a lithium battery, the overall shape is rectangular, and it sequentially includes a lower die base, an upper die base, at least one set of plates, an upper cover plate and screws from bottom to top.

[0006] The lower die base is open at the top, surrounded by the surrounding walls and the bottom surface, and has a first rectangular concave area in the middle. The upper edge of the first rectangular concave area forms a second rectangular concave area along the four sides with the upper ends of the surrounding walls. Each of the four centers of the second rectangular concave area is provided with a third rectangular groove, and each third rectangular groove is provided with a fourth rectangular groove on the outside of the upper end of the surrounding wall. At least two upward convex columns are respectively provided at the upper ends of the two long walls of the lower die base. At the upper part of a left corner of the lower die base, a semi-circular pipe groove is provided from near the corner end to the upper end of the left corner of the first rectangular concave area, and the pipe groove opening is upward.

[0007] The upper die holder is a rectangular hollowed-out structure with a central opening that is connected vertically, surrounded by four side walls. At the lower end of the rectangular hollow, a fifth rectangular concave area is formed along the four sides with the lower ends of the four side walls. In the center of each of the four sides of the fifth rectangular concave area, there is a sixth rectangular groove. On the outer side of each sixth rectangular groove near the lower end of the four side walls, there is a seventh rectangular groove. At the lower ends of the two long walls of the upper die holder, there are at least two downward concave holes that match the convex columns. In the center of the upper ends of the four side walls of the upper die holder, there are first screw blind holes. At the lower part of a left corner of the upper die holder, a semi-circular pipe groove is provided from near the corner end to the lower end of the left corner of the rectangular hollow, and the groove opening of the pipe groove faces downward.

[0008] The sleeve plate is a rectangular hollowed-out structure with a central opening that is connected vertically, and second screw through holes are respectively provided in the center of the remaining four surrounding frames.

[0009] The upper cover plate is closed on the top and has an eighth rectangular concave area with an opening facing downward in the middle. Third screw through holes are respectively provided in the center of the remaining four surrounding frames. The upper cover plate and the sleeve plate are fastened on the top of the upper die holder through the screws to form an upper die holder with adjustable thickness suitable for various lithium battery sizes.

[0010] Further, the first rectangular concave area matches the lower half of the outer packaging structure of the encapsulated lithium battery. The rectangular hollow of the upper die holder is superimposed on the rectangular hollow of the sleeve plate, and then superimposed on the eighth rectangular concave area of the upper cover plate. The total superimposed concave area formed matches the upper half of the outer packaging structure of the encapsulated lithium battery. The number of sleeve plates can be one or more to suit various sizes of encapsulated lithium batteries.

[0011] Further, the second rectangular concave area matches the edge sealing structure after hot pressing of the lower half of the aluminum-plastic composite film of the encapsulated lithium battery. The fifth rectangular concave area matches the edge sealing structure after hot pressing of the upper half of the aluminum-plastic composite film of the encapsulated lithium battery.

[0012] Further, after the upper die holder and the lower die holder are closed, the groove area formed by the third rectangular groove and the sixth rectangular groove matches the packaging structure of the PP glue on the electrode of the encapsulated lithium battery and the aluminum-plastic composite film after hot pressing. The groove area formed by the fourth rectangular groove and the seventh rectangular groove matches the structure of the exposed part of the electrode of the encapsulated lithium battery. The two semi-circular pipe grooves of the upper die holder and the lower die holder form a complete circular pipe groove when closed, and this circular pipe groove matches the structure of the PP pipe protruding from a corner of the encapsulated lithium battery. The first screw blind holes, the second screw through holes, and the third screw through holes match each other.

[0013] Optionally, the upper die holder and the lower die holder can be one of a split type or a hinge type structure.

[0014] In summary, adopting the technical solution of the present invention has the following beneficial effects:

[0015] This solution solves the problem that the existing lithium battery packaging process and packaging device cannot meet the production and processing requirements of lithium battery products with four electrodes. The flexibly combined template and upper cover plate design of this solution can be compatible with lithium battery packaging structures of various sizes, saving the manufacturing cost of the device. According to the specific situation of the lithium battery product to be packaged, a split structure of the upper die base and the lower die base or a hinge structure can be adopted. The structural design of this solution is simple and practical. As long as the dimensional accuracy of the mold is well controlled, it can ensure that each side of the outer package of the packaged lithium battery is uniformly stressed and has a uniform thickness after hot pressing and packaging, with good sealing performance, good product consistency, high qualification rate, and improved production efficiency of the lithium battery with four electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only a part of the embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0017] Figure 1 is a structural decomposition diagram of a packaging device for a lithium battery according to the present invention;

[0018] Figure 2 is a structural diagram of the packaged lithium battery according to the present invention.

[0019] DESCRIPTION OF THE REFERENCE NUMERALS:

[0020] 1 - lower die base, 2 - upper die base, 3 - template, 4 - upper cover plate, 5 - screw, 6 - first rectangular recess, 7 - second rectangular recess, 8 - third rectangular groove, 9 - fourth rectangular groove, 10 - convex column, 11 - semi-circular pipe groove, 12 - rectangular cutout, 13 - fifth rectangular recess, 14 - sixth rectangular groove, 15 - seventh rectangular groove, 16 - concave hole, 18 - second screw through hole, 19 - eighth rectangular recess, 20 - third screw through hole, 21 - packaged lithium battery, 22 - sealing edge, 23 - PP glue, 24 - electrode, 25 - PP tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

[0022] As Figures 1 to 2As shown in the figure, a packaging device for a lithium battery has a rectangular overall shape and successively includes a lower die base 1, an upper die base 2, at least one set of plates 3, an upper cover plate 4, and screws 5 from bottom to top.

[0023] The lower die base 1 has an open top, its surrounding walls and bottom enclose, and a first rectangular concave area 6 is provided in the middle. The upper edge of the first rectangular concave area 6 forms a second rectangular concave area 7 along the four sides with the upper ends of the surrounding walls. A third rectangular groove 8 is provided at the center of each of the four sides of the second rectangular concave area 7. A fourth rectangular groove 9 is provided outside the upper end of the surrounding wall near each third rectangular groove 8. At least two upward protruding columns 10 are provided at the upper ends of the two long walls of the lower die base 1. At the upper part of a left corner of the lower die base 1, a semicircular pipe groove 11 is provided from near the corner end to the upper end of the left corner of the first rectangular concave area 6, and its pipe groove opening is upward.

[0024] The upper die base 2 has a rectangular hollowing 12 that is vertically communicated in the middle and is surrounded by surrounding walls. The lower edge of the rectangular hollowing 12 forms a fifth rectangular concave area 13 along the four sides with the lower ends of the surrounding walls. A sixth rectangular groove 14 is provided at the center of each of the four sides of the fifth rectangular concave area 13. A seventh rectangular groove 15 is provided outside the lower end of the surrounding wall near each sixth rectangular groove 14. At least two downward concave holes 16 that match the protruding columns 10 are provided at the lower ends of the two long walls of the upper die base 2. The centers of the upper ends of the surrounding walls of the upper die base 2 are respectively provided with first screw blind holes (not shown in the figure). At the lower part of a left corner of the upper die base 2, a semicircular pipe groove 11 is provided from near the corner end to the lower end of the left corner of the rectangular hollowing 12, and its pipe groove opening is downward.

[0025] The set of plates 3 has a rectangular hollowing 12 that is vertically communicated in the middle, and second screw through holes 18 are respectively provided at the centers of the remaining surrounding frames.

[0026] The upper cover plate 4 is closed on the top and has an eighth rectangular concave area 19 with an opening downward in the middle. Third screw through holes 20 are respectively provided at the centers of the remaining surrounding frames. The upper cover plate 4 and the set of plates 3 are fastened on the upper surface of the upper die base 2 through screws 5 to form an upper die base with an adjustable thickness suitable for various lithium battery sizes. The first screw blind holes, the second screw through holes 18, and the third screw through holes 20 match each other.

[0027] Furthermore, the first rectangular concave area 6 matches the lower half of the outer packaging structure of the packaged lithium battery 21. The rectangular hollowing 12 of the upper die base 2 is superimposed on the rectangular hollowing 12 of the set of plates 3, and then superimposed on the eighth rectangular concave area 19 of the upper cover plate 4. The total superimposed concave area formed matches the upper half of the outer packaging structure of the packaged lithium battery 21. The number of sets of plates 3 can be one or more to suit various sizes of the packaged lithium battery 21.

[0028] Further, the sealing edge 22 formed after hot pressing the second rectangular concave area 7 with the lower half of the aluminum-plastic composite film of the encapsulated lithium battery 21 has a matching structure. The fifth rectangular concave area 13 has a matching structure with the sealing edge 22 formed after hot pressing the upper half of the aluminum-plastic composite film of the encapsulated lithium battery 21.

[0029] Further, after the upper die base 2 and the lower die base 1 are closed, the groove area formed by the third rectangular groove 8 and the sixth rectangular groove 14 is matched with the packaging structure of the PP glue 23 on the electrode of the encapsulated lithium battery 21 and the aluminum-plastic composite film after hot pressing. The groove area formed by the fourth rectangular groove 9 and the seventh rectangular groove 15 is matched with the exposed part of the electrode 24 of the encapsulated lithium battery 21. The two semi-circular pipe grooves 11 of the upper die base 2 and the lower die base 1 are closed to form a complete circular pipe groove, and this circular pipe groove is matched with the PP pipe 25 extending from a corner of the encapsulated lithium battery 21.

[0030] Optionally, the upper die base 2 and the lower die base 1 can be one of a split type or a hinge type (not shown in the figure) structure. It should be noted that in this solution, the lower die base 1 can also be designed like the upper die base 2 to have a structure that can flexibly stack the depth of the concave area, so as to be compatible with more sizes of encapsulated lithium batteries 21. In addition, as long as the number of grooves in the corresponding upper die base 2 and lower die base 1 is reduced in this solution, it is also suitable for encapsulating and processing lithium batteries with two electrodes at the same end or two electrodes at opposite ends.

[0031] In summary, adopting the technical solution of the present invention has the following beneficial effects:

[0032] This solution solves the problem that the existing lithium battery packaging process and packaging device cannot meet the production and processing requirements of lithium battery products with four electrodes. The flexible combination of the template 3 and the upper cover plate 4 in this solution can be compatible with the structures of various sizes of encapsulated lithium batteries 21, saving the manufacturing cost of the device. According to the specific situation of the encapsulated lithium battery 21 product, a split type structure or a hinge type structure can be adopted for the upper die base 2 and the lower die base 1. The structural design of this solution is simple and practical. As long as the dimensional accuracy of the mold is controlled, it can ensure that the forces and thicknesses of each side are uniform after the outer packaging of each encapsulated lithium battery 21 is hot-pressed and encapsulated, with good sealing performance, good product consistency and high qualification rate, and improves the production efficiency of lithium batteries with four electrodes.

[0033] The above-described embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the above embodiments shall be included in the protection scope of the technical solution.

Claims

1. An encapsulation device for a lithium battery, with an overall rectangular shape, characterized in that: it successively includes a lower die base, an upper die base, at least one set plate, an upper cover plate and screws from bottom to top; the lower die base is open at the top, surrounded by the peripheral walls and the bottom surface, with a first rectangular concave area in the middle. The upper edge of the first rectangular concave area forms a second rectangular concave area along the four sides with the upper ends of the peripheral walls. Each of the four centers of the second rectangular concave area is provided with a third rectangular groove, and each third rectangular groove is provided with a fourth rectangular groove on the outside of the upper end of the peripheral wall. At least two upward protruding columns are respectively provided at the upper ends of the two long walls of the lower die base; at the upper part of a left corner of the lower die base, a semicircular pipe groove is provided from near the corner end to the upper end of the left corner of the first rectangular concave area, and the pipe groove opening is upward; the upper die base is a rectangular hollow with upper and lower communication in the middle, surrounded by the peripheral walls. The lower edge of the rectangular hollow forms a fifth rectangular concave area along the four sides with the lower ends of the peripheral walls. Each of the four centers of the fifth rectangular concave area is provided with a sixth rectangular groove, and each sixth rectangular groove is provided with a seventh rectangular groove on the outside of the lower end of the peripheral wall. At least two downward concave holes matching the protruding columns are respectively provided at the lower ends of the two long walls of the upper die base. The centers of the upper ends of the peripheral walls of the upper die base are respectively provided with first screw blind holes; at the lower part of a left corner of the upper die base, a semicircular pipe groove is provided from near the corner end to the lower end of the left corner of the rectangular hollow, and the pipe groove opening is downward; the set plate is a rectangular hollow with upper and lower communication in the middle, and the centers of the remaining peripheral frames are respectively provided with second screw through holes; the upper cover plate is closed at the top, with an eighth rectangular concave area with an opening downward in the middle, and the centers of the remaining peripheral frames are respectively provided with third screw through holes; the upper cover plate and the set plate are fastened on the upper surface of the upper die base through the screws; the first rectangular concave area matches the lower half outer packaging structure of the encapsulated lithium battery; the rectangular hollow of the upper die base is superimposed on the rectangular hollow of the set plate, and then superimposed on the eighth rectangular concave area of the upper cover plate. The total superimposed concave area formed matches the upper half outer packaging structure of the encapsulated lithium battery; the number of set plates is one or more; the first screw blind holes, the second screw through holes and the third screw through holes match each other.

2. The encapsulation device for a lithium battery according to claim 1, characterized in that: the second rectangular concave area matches the edge sealing structure after hot pressing of the lower half aluminum-plastic composite film of the encapsulated lithium battery.

3. The encapsulation device for a lithium battery according to claim 2, characterized in that: the fifth rectangular concave area matches the edge sealing structure after hot pressing of the upper half aluminum-plastic composite film of the encapsulated lithium battery.

4. The encapsulation device for a lithium battery according to claim 3, characterized in that: after the upper die base and the lower die base are closed, the groove area formed by the third rectangular groove and the sixth rectangular groove matches the encapsulation structure of the PP glue on the electrode of the encapsulated lithium battery and the aluminum-plastic composite film after hot pressing, and the groove area formed by the fourth rectangular groove and the seventh rectangular groove matches the structure of the exposed part of the electrode of the encapsulated lithium battery.

5. The encapsulation device for a lithium battery according to claim 4, characterized in that: The two semicircular tube grooves of the upper mold base and the lower mold base are combined to form a complete circular tube groove, and the circular tube groove matches the PP tube structure extending from a corner of the encapsulated lithium battery.

6. A lithium battery packaging device according to claim 5, Features: The upper die base and the lower die base may be of a split type or a hinged structure.

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