CN113363655A

CN113363655A - Secondary packaging device and secondary packaging method for soft package battery

Info

Publication number: CN113363655A
Application number: CN202110619754.5A
Authority: CN
Inventors: 李峥; 冯玉川; 覃青波; 李清晖; 王明辉; 何泓材
Original assignee: Yichun Qingtao Energy Technology Co ltd
Current assignee: Yichun Qingtao Energy Technology Co ltd
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2021-09-07

Abstract

The invention discloses a secondary packaging device and a secondary packaging method for a soft package battery, and belongs to the technical field of battery processing. Laminate polymer battery's secondary packaging hardware includes casing and tray, the tray set up in the casing, the tray is used for supporting the battery, be provided with the cavity in the tray, the tray top seted up with the vacuum hole of cavity intercommunication, the cavity communicates in outside evacuating device. The secondary packaging method of the soft package battery comprises the following steps: forming a downwardly directed airflow channel within the secondary packaging chamber; puncturing the air bag; and carrying out secondary packaging on the aluminum plastic film. The invention can prevent the electrolyte from splashing to pollute the battery and the inside of the shell, thereby being beneficial to ensuring the quality of the battery.

Description

Secondary packaging device and secondary packaging method for soft package battery

Technical Field

The invention relates to the technical field of battery processing, in particular to a secondary packaging device and a secondary packaging method for a soft package battery.

Background

The soft package battery generally comprises an aluminum-plastic film, a battery cell coated in the aluminum-plastic film and an electrolyte arranged in the aluminum-plastic film. In the process of forming the soft package battery, a positive plate, a negative plate and a diaphragm need to be wound/stacked to form a battery cell, and pit punching operation is carried out on an aluminum plastic film; then, placing the battery cell into the punched hole of the aluminum-plastic film, and folding the aluminum-plastic film punched with the hole in half to coat the battery cell; in order to prevent water vapor from entering the inside of the aluminum-plastic film, a heated seal head is required to perform heat sealing on the aluminum-plastic film, in general, as shown in fig. 1, the sealing includes a top seal 103, a side seal 102, a primary sealing and a secondary sealing, the top and one side of the aluminum-plastic film after being folded in half are sealed (i.e., the top seal 103 and the side seal 102) so that only one side of the aluminum-plastic film is left with an opening, then, electrolyte is injected into the aluminum-plastic film from the opening, and a sealing area 104 at the opening is pre-sealed (i.e., the primary sealing), and then, the sealing is performed and formed; an air bag 106 is left between the sealing area 104 and the battery core 101; finally, the second sealing area 105 on the side of the air bag 106 close to the battery cell 101 is subjected to hot-pressing packaging, i.e. secondary packaging, so that the battery cell 101 is completely sealed in the aluminum plastic film.

However, in the battery formation process, gas is generated in the aluminum plastic film, and the gas needs to be extracted to perform secondary packaging of the battery. When the gas is exhausted, the air bag is punctured and the vacuum pumping is carried out simultaneously, so that the gas in the aluminum plastic film can be exhausted. However, in the process of secondary packaging of the battery by the conventional secondary packaging device, because the electrolyte in the aluminum-plastic film is in a vacuum environment, the electrolyte is easy to splash to pollute a cavity of the secondary packaging, the quality of the battery is not guaranteed, and even the external package of the battery is polluted.

Disclosure of Invention

The invention aims to provide a secondary packaging device of a soft package battery, which can guide the electrolyte in an aluminum plastic film to flow directionally when secondary packaging is carried out, so that the processing quality of the battery is improved.

The invention also aims to provide a secondary packaging method of the soft package battery, which can guide the electrolyte in the aluminum-plastic film to flow directionally when secondary packaging is carried out, so that the processing quality of the battery is improved.

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

the utility model provides a laminate polymer battery's secondary packaging hardware, includes casing and tray, the tray set up in the casing, the tray is used for supporting the battery, be provided with the cavity in the tray, the tray top seted up with the vacuum hole of cavity intercommunication, the cavity communicates in outside evacuating device.

Optionally, the vacuum holes are arranged in the tray corresponding to the area between the first sealing area and the second sealing area of the battery on the tray.

Optionally, the vacuum holes are provided in plurality, the vacuum holes are kidney-shaped holes, and the vacuum holes are arranged at equal intervals along the same direction perpendicular to the extending direction of the vacuum holes.

Optionally, a groove is formed in the top of the tray, a cover plate covers an opening of the groove, and the groove and the cover plate form the cavity.

Optionally, at least one sidewall of the groove is obliquely arranged, and at least one end of the vacuum hole is located above the obliquely arranged sidewall of the groove.

Optionally, the top edge of the tray is provided with a baffle.

Optionally, the top of the tray is provided with a step shape, and the vacuum holes are arranged on the higher side of the tray.

Optionally, still include bayonet and first lift driving piece, the bayonet setting is in the casing and be located the tray top, the bayonet connect in the execution end of first lift driving piece, first lift driving piece can drive the bayonet goes up and down.

Optionally, the packaging device further comprises a packaging mechanism, wherein the packaging mechanism comprises:

the upper end enclosure is arranged in the shell and is positioned above the tray;

the lower end enclosure is arranged in the shell and is positioned below the upper end enclosure, and the lower end enclosure movably penetrates through the tray;

the upper end enclosure is connected to an execution end of the second lifting driving piece;

the lower end enclosure is connected to an execution end of the third lifting driving piece; and

the second lifting driving piece and the third lifting driving piece can drive the upper sealing head and the lower sealing head to mutually approach or separate.

A method for secondary packaging of a soft package battery comprises the following steps:

opening a vacuum device to form a directional airflow channel in the shell;

the air bag is punctured, and the gas in the air bag is exhausted out of the secondary packaging device through the gas flow channel;

and carrying out secondary packaging on the battery.

The shell is in a negative pressure state;

the air flow channel is characterized in that the suction end sucks the air and liquid in the air bag, and the discharge end discharges the sucked air in the air bag;

the suction end is in contact with the air pocket.

Exemplary gas flow passages may be formed by vacuum holes, cavities, and external vacuum pumping devices.

The invention has the beneficial effects that:

the secondary packaging device of the soft package battery comprises a shell and a tray, wherein the tray is arranged in the shell and used for supporting the battery, a cavity is arranged in the tray, a vacuum hole communicated with the cavity is formed in the top of the tray, the cavity is communicated with an external vacuumizing device, when the external vacuumizing device is used for vacuumizing, airflow in the shell can be enabled to flow directionally under the action of negative pressure due to the arrangement of the vacuum hole, electrolyte flowing out when an air bag of the battery on the tray is punctured can flow to the vacuum hole under the guiding action of the directionally flowing airflow, and downward directional airflow is formed in the shell due to the arrangement of the vacuum hole, so that the situation that the electrolyte brought out by the gas in the battery shell splashes around the shell is avoided, and the quality of the battery and the production line environment are further guaranteed.

According to the secondary packaging method of the soft package battery, the directional airflow channel is formed in the secondary packaging chamber, after the air bag is punctured, the gas in the battery shell is sucked out, and the gas leaves the shell under the action of the directional airflow channel; part of electrolyte is taken out of the battery along with the gas and flows directionally under the action of directional airflow, so that the electrolyte can be prevented from splashing to pollute a cavity of secondary packaging, and the processing quality of the battery is favorably ensured.

Drawings

Fig. 1 is a schematic structural diagram of an aluminum-plastic film and a battery cell therein after secondary packaging;

fig. 2 is a perspective view of a secondary packaging device for a pouch battery according to an embodiment of the present invention, with one side plate removed from a case;

fig. 3 is a perspective view of a secondary packaging device of a pouch battery according to an embodiment of the present invention, with a housing removed;

fig. 4 is a perspective view of a tray and a lower head of a secondary packaging device of a pouch battery according to an embodiment of the present invention;

fig. 5 is a side view of a tray and a lower head of a secondary packaging device of a pouch battery according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view taken at A-A in FIG. 5;

fig. 7 is a schematic view of the gas flow inside the housing during evacuation.

In the figure:

100. a battery; 101. an electric core; 102. side sealing; 103. top sealing; 104. a sealing area; 105. a second sealing area; 106. an air bag;

1. a housing; 2. a tray; 21. a cavity; 22. a vacuum hole; 23. a baffle plate; 3. a bayonet; 5. a packaging mechanism; 51. an upper end enclosure; 52. a lower end enclosure; 6. a pipeline.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings of fig. 1-7.

The embodiment provides a laminate polymer battery's secondary packaging device, as shown in fig. 1 to 7, laminate polymer battery's secondary packaging device includes casing 1 and tray 2, and tray 2 sets up in casing 1, and tray 2 is used for supporting battery 100, is provided with cavity 21 in the tray 2, and the vacuum hole 22 with cavity 21 intercommunication is seted up at tray 2 top, and cavity 21 communicates in outside evacuating device (not shown). In detail, the chamber 21 communicates with the evacuation means through the duct 6.

The secondary packaging process refers to a process of packaging the battery 100 at the edge of the finished battery 100 after the formation process and cutting off the air bag 106 in the subsequent process, and is also called secondary packaging because the battery 100 has been subjected to top-side packaging and primary packaging before the formation.

In the actual operation process, when the external vacuum-pumping device starts to operate, the gas in the shell 1 is taken out of the shell 1 through the vacuum holes 22; thus, the airflow in the upper portion of the tray 2 passes through the vacuum holes 22 to form a directional, top-down, directional airflow. The electrolyte flowing out of the air pocket 106 of the battery 100 on the tray 2 can only move on the tray 2 without splashing under the guiding action of the directional flowing air flow, so that the battery 100 and the inside of the housing 1 can be prevented from being polluted, and the processing quality of the battery 100 can be ensured.

Preferably, in order to avoid the electrolyte in the battery 100 from being carried out by the air flow as much as possible, the height of the tray 100 at one side of the duct 6 is higher than that at the side far from the duct 6, so that the tray 2 forms an angle of 5-30 degrees with the horizontal plane; preferably, it is 5-15 °. If the angle is too large, the packaging strength and flatness during secondary packaging are affected, and the quality of the battery 100 is affected.

As shown in fig. 7, during the vacuum process, the gas on the upper portion of the tray 2 enters the vacuum holes 22 from the top down; the gas in the lower part of the tray 2 enters the vacuum holes 22 from the side. Therefore, in the entire case 1, neither the electrolyte in the battery 100 nor the electrolyte carried out by the gas is subjected to the upward gas force.

Preferably, the cross-sectional area of the tray 2 is more than 75%, preferably more than 85% of the cross-sectional area of the housing 1 in the plane of the tray 2.

The sectional area occupied by the tray 2 is large, and the backflow formed at the gap between the tray 2 and the housing 1 can be effectively prevented. Especially when the vacuum degree is not large, the gas flow distribution is affected.

In one embodiment, the duct 6 includes a plurality of ducts and the tray 2 is not provided with the duct 6 above.

It is understood that the area of the battery 100 where the aluminum-plastic film is punctured is located in the air pocket area of the battery 100, and after the air pocket 106 is punctured, the gas generated in the formation stage of the battery 100 is discharged from the battery 100 under the negative pressure.

In one embodiment, the vacuum holes 22 are provided in plural, the vacuum holes 22 are waist-shaped holes, and the plural vacuum holes 22 are arranged at intervals in a direction perpendicular to the extending direction of the vacuum holes 22.

As shown in fig. 6, the top of the tray 2 is provided with a groove, the opening of the groove is covered with a cover plate, and the groove and the cover plate form a cavity 21, which is convenient for processing the cavity 21. In detail, the vacuum hole 22 is provided on the cover plate, so that communication of the vacuum hole 22 and the cavity 21 can be facilitated.

Furthermore, at least one side wall of the groove is obliquely arranged, and at least one end of the vacuum hole 22 is positioned above the obliquely arranged side wall of the groove, so that the electrolyte flowing into the vacuum hole 22 can conveniently flow into the cavity 21, and the electrolyte is prevented from flowing out along the bottom surface of the cover plate.

As shown in fig. 4 to 6, the top edge of the tray 2 is provided with a baffle 23, so that the electrolyte can only flow on the tray 2, and the electrolyte is prevented from flowing into other positions in the housing 1 to pollute the whole chamber.

The battery 100 is provided with one side thickness of electric core 101 thick, and the thickness of the one side that forms air pocket 106 is thinner, and air pocket 106 one side is unsettled, is unfavorable for the puncture to air pocket 106, and in order to make the electrolyte that is taken out by the gas can flow out smoothly, the top of tray 2 sets up to the stairstepping, and vacuum hole 22 sets up in the higher one side of tray 2 to can form the support to air pocket 106.

In order to facilitate puncturing the air bag 106, as shown in fig. 1 and 2, the secondary packaging device for a pouch battery in this embodiment further includes a bayonet 3 and a first lifting driving member (not shown), wherein the bayonet 3 is disposed in the housing 1 and located above the tray 2, the bayonet 3 is connected to an execution end of the first lifting driving member, and the first lifting driving member can drive the bayonet 3 to lift. In some optional embodiments, the first lifting driving member is disposed on the outer wall of the housing 1, the bayonet 3 is connected to the actuating end of the first lifting driving member through a connecting member, the connecting member penetrates through the top wall of the housing 1, the bayonet 3 is preferably disposed in a plurality, and each bayonet 3 is connected to the connecting member, so that the electrolyte in the air bag 106 can be rapidly discharged, and the efficiency of secondary packaging is improved. In some alternative embodiments, the first lift drive is a pneumatic cylinder. Of course, the first lifting driving member may be provided in other forms in other embodiments, and is not limited herein.

A clearance groove is formed in the position, corresponding to the bayonet knife 3, of the tray 2, and in the process of puncturing the air bag 106, the bayonet knife 3 moves downwards under the action of the first lifting driving piece, and the bayonet knife 3 extends into the clearance groove to puncture the air bag 106.

As an implementation mode, the clearance groove is a blind hole; it does not extend through the tray 2, but merely provides a receiving area for the bayonet 3.

In one embodiment, the number m of the vacuum holes 22 is not less than the number n of the bayonet knives 3 and at least (m-l) of the vacuum holes 22 are positioned corresponding to the bayonet knives 3, wherein l is the number of the clearance grooves.

It will be understood that positional correspondence means that the bayonet 3 can extend into the vacuum hole 22 during the process of puncturing the air pocket 106.

In order to facilitate secondary packaging of the battery 100, as shown in fig. 2 to 4, the secondary packaging device for a pouch battery in this embodiment further includes a packaging mechanism 5, where the packaging mechanism 5 includes an upper sealing head 51, a lower sealing head 52, a second lifting driving member (not shown) and a third lifting driving member (not shown), and the upper sealing head 51 is disposed in the housing 1 and above the tray 2. The lower seal head 52 is arranged in the shell 1 and is positioned below the upper seal head 51, and the lower seal head 52 movably penetrates through the tray 2. The upper end enclosure 51 is connected to the execution end of the second lifting driving member. The lower head 52 is connected to the actuating end of the third lifting drive member. The second lifting driving member and the third lifting driving member can drive the upper seal head 51 and the lower seal head 52 to approach or separate from each other. In detail, the upper head 51 and the lower head 52 are respectively connected with a heating element, the upper head 51 and the lower head 52 can be heated, and the second lifting driving member is disposed outside the housing 1. The third lifting drive is arranged outside the housing 1. The upper head 51 and the lower head 52 are driven by the second lifting driving member and the third lifting driving member to heat-seal the battery 100. In some alternative embodiments, the second and third lift drives are both air cylinders. Of course, the second lifting driving element and the third lifting driving element may be provided in other forms in other embodiments, and are not limited herein.

When the secondary packaging device for the soft package battery in the embodiment is used, a closed cavity is formed in the shell 1, the vacuumizing device is opened, the air bag 106 is punctured by the aid of the first lifting driving piece driving the bayonet 3, airflow in the shell 1 can be enabled to flow directionally through the vacuum holes 22, electrolyte brought out by the gas can flow to the vacuum holes 22 through the tray 2 under the diversion effect of the airflow flowing directionally, the electrolyte can be prevented from splashing to pollute the inside of the battery 100 and the shell 1, the quality of the battery 100 is guaranteed, and finally the second lifting driving piece and the third lifting driving piece respectively drive the upper end socket 51 and the lower end socket 52 to be close to each other to carry out heat sealing on the battery 100.

The embodiment also provides a method for secondary packaging of the soft package battery by using the secondary packaging device according to the embodiment, which comprises the following steps:

s1, starting a vacuumizing device to form a directional airflow channel in a shell 1;

s2. puncture the gas pocket 106 and the gas in the battery 100 leaves the battery 100 under the action of the negative pressure and the directed gas flow inside the housing 1.

And S3, carrying out secondary packaging on the battery.

In detail, after the vacuum extractor is turned on, the inside of the casing 1 is in a negative pressure state. The air flow path sucks gas and liquid in the air bag 106 at a suction end thereof and discharges the sucked gas in the air bag 106 at a discharge end thereof. The suction end is in contact with the air pocket 106. Exemplary gas flow passages may be formed by vacuum holes 22, cavity 21 and external vacuum pumping means.

In this embodiment, after the air bag 106 is punctured, the electrolyte flowing out of the air bag 106 can flow directionally under the action of the directional airflow channel, so that the electrolyte can be prevented from splashing to pollute a secondary packaging chamber, and the processing quality of the battery 100 can be ensured.

In step S3, the process of performing secondary encapsulation on the battery 100 is known in the art, and includes, but is not limited to, adjusting the position of the upper head 51 by the second lifting driving member, and adjusting the position of the lower head 52 by the third lifting driving member, so that the upper head 51 and the lower head 52 move toward each other. Meanwhile, the heating element heats the upper head 51 and the lower head 52 to a preset temperature. The upper cap 51 and the lower cap 52 simultaneously encapsulate the two sealing regions 105 of the battery 100.

It is understood that any known two-sealing process can be used in the present application without departing from the inventive concept of the present application, such as only using the second elevating driving member to drive the upper sealing head 51 and the lower sealing head 52 with a fixed structure.

The packaging process may further include step S4: the air pocket 106 is cut off.

The method of cutting out the air pockets 106 is not particularly limited, and any known method can be used in the present invention, such as cutting out by a human, or cutting out by an automated device.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a laminate polymer battery's secondary packaging hardware, includes casing (1), its characterized in that still includes tray (2), tray (2) set up in casing (1), tray (2) are used for supporting battery (100), be provided with cavity (21) in tray (2), tray (2) top seted up with vacuum hole (22) of cavity (21) intercommunication, cavity (21) communicate in outside evacuating device.

2. The secondary packaging device for pouch batteries according to claim 1, characterized in that the vacuum holes (22) are provided in the tray (2) corresponding to the region between the primary sealing area (104) and the secondary sealing area (105) of the battery (100) on the tray (2).

3. The secondary packaging device for the pouch battery according to claim 1, wherein the vacuum hole (22) is provided in plurality;

preferably, the vacuum holes (22) are kidney-shaped holes;

preferably, the plurality of vacuum holes (22) are arranged at intervals in a direction perpendicular to an extending direction of the vacuum holes (22).

4. The secondary packaging device for the soft package battery is characterized in that a groove is formed in the top of the tray (2), a cover plate covers the opening of the groove, and the groove and the cover plate form the cavity (21).

5. The pouch battery secondary packaging device according to claim 4, wherein at least one side wall of the groove is obliquely arranged, and at least one end of the vacuum hole (22) is located above the obliquely arranged side wall of the groove.

6. The secondary packaging device for the pouch battery according to claim 1, characterized in that the top edge of the tray (2) is provided with a baffle (23).

7. The secondary packaging device for the pouch battery according to claim 1, wherein the top of the tray (2) is provided in a stepped shape, and the vacuum hole (22) is provided at the higher side of the tray (2).

8. The secondary packaging device for the soft package battery according to any one of claims 1 to 7, further comprising a bayonet (3) and a first lifting driving member, wherein the bayonet (3) is arranged in the housing (1) and above the tray (2), the bayonet (3) is connected to an execution end of the first lifting driving member, and the first lifting driving member can drive the bayonet (3) to lift.

9. The secondary packaging device for the pouch battery according to any one of claims 1 to 7, characterized by further comprising a packaging mechanism (5), wherein the packaging mechanism (5) comprises:

the upper end enclosure (51) is arranged in the shell (1) and is positioned above the tray (2);

the lower seal head (52) is arranged in the shell (1) and is positioned below the upper seal head (51), and the lower seal head (52) movably penetrates through the tray (2);

the upper end enclosure (51) is connected to an execution end of the second lifting driving piece;

the lower end enclosure (52) is connected to an execution end of the third lifting driving piece; and

the second lifting driving piece and the third lifting driving piece can drive the upper seal head (51) and the lower seal head (52) to be close to or far away from each other.

10. A method for secondary packaging of a pouch battery using the secondary packaging device according to any one of claims 1 to 9, comprising the steps of:

s1, opening a vacuumizing device to form a directional airflow channel in the shell;

s2, puncturing an air bag (106) to form directional air flow in the shell;

and S3, carrying out secondary packaging on the battery.