Packaging mechanism, packaging device and battery

Abstract

The utility model provides a packaging mechanism, a packaging device and a battery, and relates to the technical field of batteries. According to the packaging mechanism provided by the invention, the filling blocks can slide in the accommodating grooves, and the number of the filling blocks can be adjusted according to actual requirements, so that the positions and the number of the filling blocks can be adjusted according to different packaging requirements, and the packaging structure of the battery is packaged by utilizing the upper surfaces of the filling blocks; therefore, more flexible packaging of the battery is realized, and the sealing effect of any position of a subsequent battery cell is achieved, so that after the battery generates gas in a test, the packaging structure of the battery is cut and exhausted, and then the cut position is packaged by using the upper surface of the filling block.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a packaging mechanism, a packaging device and a battery. Background Art

[0002] With the increasing development of the industry, the specific energy of soft-pack batteries is continuously increasing at present, and the attention to the life and application safety of soft-pack batteries is also getting higher and higher; the aluminum-plastic film soft-pack battery is mainly sealed by using a hot-melt method for the aluminum-plastic film polypropylene packaging layer and the tab polypropylene packaging layer; at present, the evaluation of the sealing effect in the industry only stays on the basic packaging strength test and cannot evaluate the long-term sealing effect; the main reason for the current inability to evaluate the long-term effect is that after the finished product of the battery cell is packaged, the interior contains relevant components such as electrolyte and electrode sheets, and there will be some moisture in the battery electrolyte and electrode sheets. When the battery cell undergoes an accelerated life test in a high-temperature and high-humidity environment, the moisture reacts with the lithium salt in the electrolyte to generate hydrofluoric acid, which in turn causes the test battery cell to bulge and break, and fail in advance, and the experimental expected results cannot be obtained. Summary of the Utility Model

[0003] In view of this, the present application provides a packaging mechanism, a packaging device and a battery, aiming to solve the above technical problems to a certain extent.

[0004] In a first aspect, the present application provides a packaging mechanism for packaging a battery, and the packaging mechanism includes:

[0005] A packaging main body extending along a first direction, the packaging main body having a receiving groove extending along the first direction, the receiving groove having an opening portion opening along a second direction perpendicular to the first direction, the opening portion extending along the first direction, and the packaging main body further including a plurality of fixing portions spaced along the first direction on the packaging main body;

[0006] A plurality of filling blocks for at least partially filling into the receiving groove, the filling blocks being able to slide in the receiving groove and being connected to the fixing portions corresponding to the positions in the first direction to be fixed relative to the packaging main body, and one side surface of the filling block in the second direction is exposed via the opening portion to at least engage with the outer surface of the packaging main body.

[0007] Preferably, the dimension of the packaging main body in the first direction is 10 mm longer than the total length of the battery packaged by the packaging mechanism.

[0008] Preferably, the thickness W1 of the wall portion of the packaging main body for defining the receiving groove is 5-10 mm;

[0009] The dimension W2 of the opening portion in the third direction is greater than or equal to 10 mm, and the dimension of the surface of the filling block exposed through the opening portion in the third direction is the same as the dimension of the opening portion in the third direction;

[0010] Wherein, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0011] Preferably, the encapsulation body includes two wall portions opposite to each other in the third direction, and the dimension of one of the two wall portions in the first direction is greater than that of the other of the two wall portions;

[0012] Wherein, each of the two wall portions is formed with a recess extending along the first direction, and the recess is used to cooperate with the filling block so that the filling block is held in the receiving groove, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0013] Preferably, from the side where the wall portion where the recess is located to the receiving groove, the dimension of the recess in the second direction gradually decreases;

[0014] The filling block includes two embedding portions opposite to each other in the third direction, the embedding portions extend along the first direction, and the shape of the embedding portions is adapted to the recess so as to be able to slide in the recess.

[0015] Preferably, the fixing portion is formed as a first through hole penetrating the encapsulation body along the third direction, and the filling block has a second through hole extending along the third direction;

[0016] The encapsulation mechanism further includes a plurality of fasteners, and the plurality of fasteners are arranged in one-to-one correspondence with the plurality of fixing portions, and the fasteners pass through the first through hole and the second through hole to fix the filling block, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0017] Preferably, the encapsulation mechanism further includes a connecting portion disposed on one side of the encapsulation body in the second direction, the connecting portion extends along the first direction, and the connecting portion has a plurality of connecting holes spaced along the first direction, and the plurality of connecting holes are used to connect an external encapsulation device;

[0018] The dimension of the filling block in the first direction is 20 mm.

[0019] In a second aspect, the present application provides an encapsulation device, which includes two encapsulation mechanisms as described above, and the two encapsulation mechanisms are disposed opposite to each other in the second direction and can approach each other to encapsulate a battery located between the two encapsulation mechanisms.

[0020] In a second aspect, the present application provides a battery encapsulated by the encapsulation device as described above. The battery has a length direction and a width direction, and the battery includes:

[0021] An encapsulation structure and a bare battery cell, where the bare battery cell is encapsulated inside the encapsulation structure by the encapsulation structure;

[0022] Wherein, the encapsulation structure includes an exhaust cavity, the exhaust cavity includes a conduction cavity and a trimming cavity. The conduction cavity is adjacent to the bare battery cell at least in one of the length direction and the width direction. The trimming cavity is not adjacent to the bare battery cell in both the length direction and the width direction. The trimming cavity communicates with the conduction cavity, and the part of the encapsulation structure located between the trimming cavity and the bare battery cell is encapsulated.

[0023] Preferably, the conduction cavity is wound around the outer sides of two wide sides and one long side of the bare battery cell. A part of a second encapsulation area is disposed at an interval between the trimming cavity and the other long side of the bare battery cell. A first encapsulation area is wound around the outside of the conduction cavity, and the remaining area of the encapsulation structure is another part of the second encapsulation area.

[0024] According to the encapsulation mechanism provided by the present application, since the filling block can slide in the accommodation groove and the number of filling blocks can be adjusted according to actual needs, therefore, the position and number of the filling blocks can be adjusted according to different encapsulation requirements, so as to use the upper surface of the filling block to encapsulate the encapsulation structure of the battery, and further achieve more flexible encapsulation of the battery, achieve the sealing effect at any position of the subsequent battery cell, and thus allow the encapsulation structure of the battery to be trimmed after the battery generates gas during the test. After exhausting the gas, the trimmed position is encapsulated by using the upper surface of the filling block as described above.

[0025] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 A schematic diagram showing a partial structure of the encapsulation device provided by the embodiment of the present application;

[0028] Figure 2Schematic diagram showing a plan view of a packaging body provided according to an embodiment of the present application;

[0029] Figure 3 Schematic diagram showing a plan view of a packaging mechanism provided according to an embodiment of the present application;

[0030] Figure 4 Schematic diagram showing a plan view of the working process of a packaging device provided according to an embodiment of the present application;

[0031] Figure 5 Schematic diagram showing a three-dimensional view of the working process of a packaging device provided according to an embodiment of the present application;

[0032] Figure 6 Schematic diagram showing a plan view of a battery provided according to an embodiment of the present application;

[0033] Figure 7 Schematic diagram showing a plan view of the cutting area and the reinforcement packaging area of a battery provided according to an embodiment of the present application;

[0034] Figure 8 Schematic diagram showing a plan view of the re-packaging of a battery provided according to an embodiment of the present application.

[0035] Reference numerals:

[0036] 100 - Packaging body; 110 - Accommodating groove; 111 - Open part; 120 - Fixing part; 130 - Wall part; 131 - Concave part; 140 - Connecting part; 141 - Connecting hole;

[0037] 200 - Filling block; 210 - Surface; 220 - Embedded part; 230 - Second through hole;

[0038] 400 - Battery; 410 - Bare battery cell; 420 - Encapsulation structure; 421 - Conductive cavity; 422 - Cutting cavity; 423 - First packaging area; 424 - Second packaging area; 425 - Cutting area; 426 - Reinforcement packaging area. Detailed implementation manners

[0039] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0040] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0042] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0043] According to the encapsulation mechanism provided by the first aspect of the embodiments of the present application, the structure and working principle of the encapsulation mechanism will be specifically described below in conjunction with Figures 1 to 5 Specifically describe the structure and working principle of the encapsulation mechanism.

[0044] According to the encapsulation mechanism provided by the embodiments of the present application, the encapsulation mechanism is used to encapsulate the battery 400, and the encapsulation mechanism includes an encapsulation main body 100 and a plurality of filling blocks 200.

[0045] In the embodiment, the encapsulation main body 100 extends along a first direction, the encapsulation main body 100 has a receiving groove 110 extending along the first direction, the receiving groove 110 has an opening portion 111 opening along a second direction perpendicular to the first direction, the opening portion 111 extends along the first direction, and the encapsulation main body 100 further includes a plurality of fixing portions 120, and the plurality of fixing portions 120 are arranged on the encapsulation main body 100 at intervals along the first direction.

[0046] In an embodiment, a plurality of filling blocks 200 are used to at least partially fill into the receiving groove 110. The filling blocks 200 can slide within the receiving groove 110 and are connected to the fixing portion 120 corresponding to the position in the first direction so as to be fixed relative to the encapsulation main body 100. One side surface 210 of the filling block 200 in the second direction is exposed via the opening portion 111 to be at least joined to the outer surface 210 of the encapsulation main body 100.

[0047] Thus, according to the encapsulation mechanism provided by the embodiment of the present application, since the filling blocks 200 can slide within the receiving groove 110 and the number of the filling blocks 200 can be adjusted according to actual needs, therefore, according to different encapsulation requirements, the positions and the number of the filling blocks 200 can be adjusted, so as to use the upper surface 210 of the filling blocks 200 to encapsulate the encapsulation structure 420 of the battery 400, and further achieve more flexible encapsulation of the battery 400, and achieve the sealing effect at any position of the subsequent battery core, so that after the battery 400 generates gas during the test, the encapsulation structure 420 of the battery 400 can be cut, and after exhausting the gas, the upper surface 210 of the filling blocks 200 is used to encapsulate the cutting position.

[0048] In an embodiment, as an example, the upper surface 210 of the filling block 200 can protrude from the receiving groove 110 or be flush with the outer edge of the receiving groove 110.

[0049] In an embodiment, the second direction can be, for example, the vertical direction, the first direction can be a horizontal direction, and the subsequent third direction can be another horizontal direction perpendicular to the first direction.

[0050] In an embodiment, as an example, the battery 400 can be, for example, a soft-pack battery 400, and the encapsulation structure 420 can be, for example, an aluminum-plastic film.

[0051] According to the encapsulation mechanism provided by the embodiment of the present application, the dimension of the encapsulation main body 100 in the first direction is 10 mm longer than the total length of the battery 400 encapsulated by the encapsulation mechanism, so as to ensure that the battery 400 can be completely encapsulated.

[0052] According to the encapsulation mechanism provided by the embodiment of the present application, the thickness W1 of the wall portion 130 of the encapsulation main body 100 for defining the receiving groove 110 can be 5 - 10 mm, so as to ensure the strength of the encapsulation main body 100 and at the same time ensure that the space occupied by the encapsulation main body 100 is not too large. W1 can be, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm.

[0053] According to the encapsulation mechanism provided by the embodiments of the present application, the size W2 of the open portion 111 in the third direction is greater than or equal to 10 mm, such as 10 mm, 11 mm, 12 mm or even larger. The size of the surface 210 of the filling block 200 exposed through the open portion 111 in the third direction is the same as the size of the open portion 111 in the third direction, so as to ensure the sealing performance of the battery 400 encapsulation.

[0054] According to the encapsulation mechanism provided by the embodiments of the present application, the encapsulation main body 100 includes two wall portions 130 opposite to each other in the third direction. The size of one of the two wall portions 130 in the first direction is greater than that of the other of the two wall portions 130. In this way, it is beneficial to use the part where one wall portion 130 is longer than the other wall portion 130 as a reference to facilitate the loading of the filling block 200 into the receiving groove 110.

[0055] In an embodiment, each of the two wall portions 130 is formed with a recess 131 extending along the first direction. The recess 131 is used to cooperate with the filling block 200 so that the filling block 200 is held in the receiving groove 110, ensuring the reliability of the installation of the filling block 200 on the encapsulation main body 100.

[0056] According to the encapsulation mechanism provided by the embodiments of the present application, from the side where the wall portion 130 where the recess 131 is located to the receiving groove 110, the size of the recess 131 in the second direction gradually decreases. As an example, the recess 131 can be formed as a substantially dovetail groove.

[0057] Correspondingly, the filling block 200 includes two embedding portions 220 opposite to each other in the third direction. The embedding portions 220 extend along the first direction. The shape of the embedding portions 220 is adapted to the recess 131 so as to be able to slide in the recess 131, and the embedding portions 220 are formed as substantially wedge-shaped structures.

[0058] According to the encapsulation mechanism provided by the embodiments of the present application, the fixing portion 120 is formed as a first through hole penetrating the encapsulation main body 100 along the third direction. The filling block 200 has a second through hole 230 extending along the third direction. The encapsulation mechanism further includes a plurality of fasteners (such as screws). The plurality of fasteners are arranged in one-to-one correspondence with the plurality of fixing portions 120. The fasteners pass through the first through hole and the second through hole 230 to fix the filling block 200.

[0059] According to the encapsulation mechanism provided by the embodiments of the present application, the encapsulation mechanism further includes a connection portion 140 provided on one side of the encapsulation main body 100 in the second direction (the connection portion 140 can be, for example, a strip-shaped structure). The connection portion 140 extends along the first direction, and the connection portion 140 has a plurality of connection holes 141 spaced along the first direction. The plurality of connection holes 141 are used to connect an external encapsulation device, for example, by screw connection. In addition, in the embodiment, the size of the filling block 200 in the first direction is 20 mm.

[0060] According to a second aspect of the embodiments of the present application, an encapsulation device is provided. The encapsulation device includes two upper encapsulation mechanisms. The two encapsulation mechanisms are disposed opposite to each other in the second direction (i.e., the vertical direction) and can approach each other (for example, are respectively connected to corresponding cylinders) to encapsulate a battery 400 located between the two encapsulation mechanisms.

[0061] The encapsulation device realizes functions such as sealing before the cell test, presetting the gas channel during the test process, and sealing the cell after exhaust, avoiding the sealing failure caused by continuous swelling during the cell test; the encapsulation device can continuously realize the sealing function after exhaust, providing a necessary process for the collection of long-term data. According to the actually collected test data, the service life and application safety of the current soft-pack battery 400 can be improved.

[0062] According to a third aspect of the embodiments of the present application, a battery 400 is provided. The battery 400 is encapsulated by the above encapsulation device. The battery 400 has a length direction and a width direction. The battery 400 includes: an encapsulation structure 420 and a bare cell 410. The bare cell 410 is encapsulated by the encapsulation structure 420 inside the encapsulation structure 420.

[0063] In the embodiment, the encapsulation structure 420 includes an exhaust cavity. The exhaust cavity includes a conduction cavity 421 and a cutting cavity 422. The conduction cavity 421 is adjacent to the bare cell 410 at least in one of the length direction and the width direction. The cutting cavity 422 is not adjacent to the bare cell 410 in both the length direction and the width direction. The cutting cavity 422 is communicated with the conduction cavity 421. The part of the encapsulation structure 420 located between the cutting cavity 422 and the bare cell 410 is encapsulated.

[0064] In this way, when the battery 400 generates gas, a position in the cutting cavity 422 can be selected as the cutting area 425 and cut open, the gas is squeezed from the conduction cavity 421 into the cutting cavity 422, and then discharged from the battery 400. Then, at the upstream side of the cutting area 425, corresponding to the position of the cutting cavity 422, encapsulation is performed to form a reinforcement encapsulation area 426, completing the re-sealing of the battery 400. As the exhaust is carried out multiple times, the selection of the cutting area 425 gradually moves to the right.

[0065] In an embodiment, specifically, the conduction cavity 421 is wound around the outer sides of two wide sides and one long side of the bare battery cell 410. A part of the second encapsulation area 424 is disposed at an interval between the trimming cavity 422 and the other long side of the bare battery cell 410. The first encapsulation area 423 is wound around the outside of the conduction cavity 421. The remaining area of the encapsulation structure 420 is the other part of the second encapsulation area. The first encapsulation area 423 is formed as a substantially primary encapsulation area, and the second encapsulation area 424 is formed as a substantially secondary encapsulation area.

[0066] In an embodiment, the filling block 200 is assembled with the upper and lower encapsulation bodies 100 through a wedge-shaped structure and bolts. Further, the assembled upper and lower head bodies are respectively installed on the encapsulation device through bolt connections, and the battery cell that has completed the first side sealing and top sealing is placed between the upper and lower encapsulation bodies 100. After adjusting the temperature of the encapsulation device, the upper and lower heads are driven by the device cylinder for encapsulation. In the embodiment, after the encapsulation is completed, the battery 400 is placed in a high-temperature and high-humidity environment for testing. As the testing time extends, if the tested battery cell bulges, the gas flow area (exhaust cavity) is opened and then squeezed for exhaust. After the exhaust is completed, the position of the filling block 200 is adjusted to the area to be encapsulated, and then the battery cell is encapsulated again. Subsequently, according to the gas production amount, exhaust-encapsulation-exhaust-encapsulation is performed, and this step can be cycled.

[0067] The above are only the preferred embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent structural transformation made by using the content of the specification and drawings of the present application under the innovative concept of the present application, or any direct / indirect application in other related technical fields is included in the protection scope of the present application.

Claims

1. An encapsulation mechanism, characterized in that, The encapsulation mechanism is used to encapsulate a battery, and the encapsulation mechanism includes: An encapsulation main body that extends along a first direction. The encapsulation main body has a receiving groove that extends along the first direction. The receiving groove has an opening portion that opens in a second direction perpendicular to the first direction. The opening portion extends along the first direction. The encapsulation main body further includes a plurality of fixing portions that are spaced apart along the first direction on the encapsulation main body; A plurality of filling blocks that are used to at least partially fill into the receiving groove. The filling blocks can slide in the receiving groove and are connected to the fixing portions corresponding to their positions in the first direction to be fixed relative to the encapsulation main body. One side surface of the filling blocks in the second direction is exposed via the opening portion to at least engage with the outer surface of the encapsulation main body.

2. The encapsulation mechanism according to claim 1, characterized in that, The dimension of the encapsulation main body in the first direction is 10 mm longer than the total length of the battery encapsulated by the encapsulation mechanism.

3. The encapsulation mechanism according to claim 1, wherein The thickness W1 of the wall portion of the encapsulation main body for defining the receiving groove is 5 - 10 mm; The dimension W2 of the opening portion in a third direction is greater than or equal to 10 mm, and the dimension of the surface of the filling block exposed via the opening portion in the third direction is the same as the dimension of the opening portion in the third direction; Wherein, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

4. The encapsulation mechanism according to claim 1, wherein, The encapsulation main body includes two wall portions opposite to each other in the third direction, and the dimension of one of the two wall portions in the first direction is greater than that of the other of the two wall portions; Wherein, each of the two wall portions is formed with a recess that extends along the first direction. The recess is used to cooperate with the filling block to keep the filling block in the receiving groove. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

5. The encapsulation mechanism according to claim 4, wherein From the side where the wall portion where the recess is located to the receiving groove, the dimension of the recess in the second direction gradually decreases; The filling block includes two embedding portions opposite to each other in the third direction. The embedding portions extend along the first direction, and the shape of the embedding portions is adapted to the recess to be able to slide in the recess.

6. The encapsulation mechanism according to claim 1, characterized in that, The fixing portion is formed as a first through hole that penetrates the encapsulation main body along the third direction, and the filling block has a second through hole that extends along the third direction; The encapsulation mechanism further includes a plurality of fasteners that are provided in one-to-one correspondence with the plurality of fixing portions. The fasteners pass through the first through hole and the second through hole to fix the filling block. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

7. The encapsulation mechanism according to claim 1, wherein The encapsulation mechanism further includes a connecting portion disposed on one side of the encapsulation main body in the second direction. The connecting portion extends along the first direction and has a plurality of connecting holes spaced apart along the first direction. The plurality of connecting holes are used to connect an external encapsulation device; The filling block has a size of 20 mm in the first direction.

8. An encapsulation device, characterized in that, The encapsulation device includes two encapsulation mechanisms as described in any one of claims 1 to 7. The two encapsulation mechanisms are disposed opposite to each other in the second direction and can approach each other to encapsulate a battery located between the two encapsulation mechanisms.

9. A battery, characterized in that, The battery is encapsulated by the encapsulation device as described in claim 8. The battery has a length direction and a width direction. The battery includes: An encapsulation structure and a bare battery cell, and the bare battery cell is encapsulated inside the encapsulation structure by the encapsulation structure; Wherein, the encapsulation structure includes an exhaust cavity. The exhaust cavity includes a conduction cavity and a trimming cavity. The conduction cavity is adjacent to the bare battery cell at least in one of the length direction and the width direction. The trimming cavity is not adjacent to the bare battery cell in both the length direction and the width direction. The trimming cavity communicates with the conduction cavity, and a portion of the encapsulation structure located between the trimming cavity and the bare battery cell is encapsulated.

10. The battery according to claim 9, characterized in that, The conduction cavity is wound around the outer sides of two wide sides and one long side of the bare battery cell. A part of the second encapsulation area is disposed at an interval between the trimming cavity and the other long side of the bare battery cell. The first encapsulation area is wound around the outside of the conduction cavity, and the remaining area of the encapsulation structure is another part of the second encapsulation area.

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