CN217444519U - Laminate polymer battery and heat-seal mould - Google Patents

Abstract

The utility model belongs to the technical field of the battery, a laminate polymer battery and heat-seal mould is disclosed, laminate polymer battery includes the body, and laminate polymer battery still includes the blast pipe, and the blast pipe is inserted and is located on the body, and the blast pipe is configured into the inside of the external world of one-way conduction and body, and the gas of the inside of body can be circulated to the external world by the blast pipe, wherein: the periphery of the exhaust pipe is covered with a first heat sealing layer, and the first heat sealing layer and a second heat sealing layer covered outside the body are made of the same material. The utility model discloses a mode of heat-seal makes first heat-seal layer and second heat-seal layer fuse to with blast pipe and laminate polymer battery's body fixed connection. Because the blast pipe after the heat-seal forms integratively with laminate polymer battery's body, consequently even laminate polymer battery swells and contracts the back through the inflation repeatedly, the leakproofness of the junction of blast pipe and laminate polymer battery's body can not receive the influence yet to make laminate polymer battery have higher life.

Description

Laminate polymer battery and heat-seal mould

Technical Field

The utility model relates to a battery technology field especially relates to a laminate polymer battery and heat-seal mould.

Background

As a battery with good safety performance, a lithium ion battery is widely used in the fields of mobile phones, tablet computers, wearable devices, mobile power sources, electronic cigarettes, various digital products, electric tools, power sources, energy storage and the like. The lithium ion battery can generate gas in the recycling process, and if the gas cannot be discharged in time, the lithium ion battery can expand and swell, so that the contact between the positive electrode and the negative electrode of the battery is poor, the problems of high capacity attenuation of the battery, local lithium precipitation of the battery and the like can be caused, and the performance of the battery is greatly influenced.

Therefore, a lithium ion battery with an exhaust pipe is provided in the prior art to timely exhaust gas generated inside the battery, thereby preventing the battery performance from being affected. However, in the prior art, the exhaust pipe is generally fixed to the battery body by means of a sealant, and for the soft package lithium ion battery, when the battery repeatedly expands and swells due to gas generation and retracts when the gas is exhausted, the sealant may fall off from the battery, so that the service life of the battery is short.

Therefore, the above problems need to be solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a laminate polymer battery and heat-seal mould, this laminate polymer battery has higher life.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model discloses an aspect provides a laminate polymer battery, laminate polymer battery includes the body, laminate polymer battery still includes the blast pipe, the blast pipe is inserted and is located on the body, the blast pipe be configured into one-way switch on external with the inside of body, the gas of the inside of body can by the blast pipe circulation is to the external world, wherein:

the periphery of the exhaust pipe is covered with a first heat sealing layer, and the first heat sealing layer and a second heat sealing layer covered outside the body are made of the same material.

Preferably, the exhaust pipe is a copper pipe.

Preferably, the diameter of the exhaust pipe is less than or equal to 100 μm.

Preferably, the thickness of the first heat-seal layer is 50 μm or more and 100 μm or less.

Preferably, the first heat-seal layer and the second heat-seal layer are both made of polypropylene material.

Preferably, the body is further provided with a tab outside, the tab is arranged on the same side as the exhaust pipe, the exhaust pipe comprises a first pipe part inserted in the body and a second pipe part exposed out of the body, and the length of the second pipe part in the axial direction is smaller than or equal to the length of the tab in the axial direction of the exhaust pipe.

Preferably, the length of the first tube part along the axial direction of the first tube part is greater than or equal to the seal width of the top package of the soft-package battery.

Preferably, a check valve is arranged on one side of the exhaust pipe far away from the body.

The utility model discloses another aspect still provides a heat-seal mould, heat-seal mould is configured to the heat-seal like the laminate polymer battery as above, with fixed connection the blast pipe with the body.

Preferably, the heat sealing mold is provided with a receiving groove configured to receive a boundary area of the exhaust pipe and the body.

The utility model has the advantages that: the utility model discloses in, because cover the first heat-seal layer of locating the periphery of blast pipe and cover the material of locating the outside second heat-seal layer of body the same, consequently the utility model discloses in can make first heat-seal layer and second heat-seal layer fuse through the mode of heat-seal to with blast pipe and laminate polymer battery's body fixed connection, and the junction of sealed blast pipe and laminate polymer battery's body. Because the utility model discloses the blast pipe after the middle-sized heat-seal forms integratively with laminate polymer battery's body, even consequently laminate polymer battery expands through producing gas repeatedly and swells to return back when gaseous being discharged, the leakproofness of the junction of blast pipe and laminate polymer battery's body can not receive the influence yet, thereby makes laminate polymer battery have higher life. The process the utility model provides a laminate polymer battery of heat-seal die heat-seal has higher life.

Drawings

Fig. 1 is the schematic structural diagram of the pouch battery in the embodiment of the present invention.

In the figure:

1. a body; 11. a tab;

2. an exhaust pipe; 21. a second pipe portion; 22. a one-way valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. 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. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Please refer to fig. 1, this embodiment provides a pouch battery, and the pouch battery includes body 1, and the pouch battery still includes blast pipe 2, and blast pipe 2 is inserted and is located on body 1, and blast pipe 2 is configured as the inside of one-way conduction external and body 1, and the gas of the inside of body 1 can be circulated to the external world by blast pipe 2, wherein: the exhaust pipe 2 is covered with a first heat seal layer (not shown) on the outer periphery thereof, and the first heat seal layer is made of the same material as a second heat seal layer (not shown) provided on the outer side of the body 1.

In the present embodiment, since the first heat-seal layer covering the outer periphery of the exhaust pipe 2 and the second heat-seal layer covering the outer portion of the body 1 are made of the same material, the first heat-seal layer and the second heat-seal layer can be fused by heat sealing in the present embodiment, so that the exhaust pipe 2 and the body 1 of the pouch battery are fixedly connected, and the joint of the exhaust pipe 2 and the body 1 of the pouch battery is sealed. Because in this embodiment the body 1 of blast pipe 2 after the heat-seal forms integratively with laminate polymer battery, consequently even laminate polymer battery expands because of producing gas through relapse and swells to when gaseous by the discharge back of contracting, the leakproofness of the junction of blast pipe 2 and laminate polymer battery's body 1 can not receive the influence yet, thereby makes laminate polymer battery have higher life.

Based on the foregoing, the present embodiment further provides a heat sealing mold (not shown in the drawings), which is configured to heat seal the pouch battery as described above to fixedly connect the exhaust pipe 2 and the body 1, and the pouch battery heat-sealed by the heat sealing mold has a longer service life.

Further, the heat-seal mold is provided with the storage tank, and the storage tank is configured to the boundary region of holding blast pipe 2 and body 1, and the cell wall of storage tank can wrap in the periphery of the junction of blast pipe 2 and laminate polymer battery's body 1 promptly to fuse first heat-seal layer and second heat-seal layer, thereby fixed connection blast pipe 2 and laminate polymer battery's body 1.

In order to conduct the outside and the inside of the body 1 of the pouch battery in a single direction, a one-way valve 22 is arranged on one side of the exhaust pipe 2 away from the body 1 in the embodiment. In this embodiment, when the internal pressure of the body 1 of the pouch battery reaches 300-1000Pa, the check valve 22 is opened under the action of the internal pressure of the body 1 of the pouch battery, the gas inside the body 1 of the pouch battery can be circulated to the outside through the exhaust pipe 2, and when the gas enters from the outside, the check valve 22 is closed to cut off the flow of the gas.

It can be understood that, in other alternative embodiments, the exhaust treatment may also be performed manually by a worker, specifically, the worker may perform the exhaust treatment according to the expansion rate of the pouch battery, when the expansion rate of the pouch battery is 1% to 15%, the worker performs the exhaust treatment, and the expansion rate may be calculated by the thickness change of the pouch battery, and since the calculation of the expansion rate according to the thickness change of the pouch battery is prior art, details of the calculation are not described here. In this embodiment, the gas discharge mode of the pouch battery is not particularly limited.

Further, the exhaust pipe 2 in this embodiment is a copper pipe to prevent the exhaust pipe 2 from being broken during the process of assembling the pouch battery.

In order not to affect the subsequent assembly of the pouch battery into the battery box, it is necessary to ensure that the sum of the diameter of the vent pipe 2 and the thickness of the first heat seal layer is less than the thickness of the body 1 of the battery, and in the present embodiment, the diameter of the vent pipe 2 is less than or equal to 100 μm.

It can be understood that, since the exhaust pipe 2 in the present embodiment is a copper pipe, even if the diameter of the exhaust pipe 2 is small, the exhaust pipe 2 is not easily broken during the process of assembling the pouch battery

Further, the thickness of the first heat-seal layer in this embodiment is 50 μm or more and 100 μm or less.

In this embodiment, the first heat-seal layer and the second heat-seal layer are both made of polypropylene material.

Preferably, the tab 11 is further arranged outside the body 1 of the pouch battery, the tab 11 is arranged on the same side as the exhaust pipe 2, the exhaust pipe 2 comprises a first pipe part (not shown in the figure) inserted inside the body 1 and a second pipe part 21 exposed outside the body 1, and the axial length of the second pipe part 21 is less than or equal to the axial length of the tab 11 along the exhaust pipe 2, so as to further avoid influencing the subsequent assembly of the pouch battery into the battery box.

Further, first pipe portion is greater than or equal to the seal width of laminate polymer battery top encapsulation along its axial length, and preferably, in this embodiment, first pipe portion is equal to the seal width of laminate polymer battery top encapsulation along its axial length to reduce laminate polymer battery's invalid volume, thereby further be convenient for laminate polymer battery follow-up assembly to in the battery box.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a laminate polymer battery, laminate polymer battery includes body (1), its characterized in that, laminate polymer battery still includes blast pipe (2), blast pipe (2) are inserted and are located on body (1), blast pipe (2) are configured as one-way switch on external world with the inside of body (1), the gas of the inside of body (1) can by blast pipe (2) circulate to the external world, wherein:

the periphery of the exhaust pipe (2) is covered with a first heat sealing layer, and the first heat sealing layer and a second heat sealing layer covered outside the body (1) are made of the same material.

2. The pouch battery according to claim 1, wherein the gas vent pipe (2) is a copper pipe.

3. The pouch cell according to claim 2, characterized in that the diameter of the gas vent tube (2) is less than or equal to 100 μm.

4. The pouch battery according to claim 1, characterized in that the thickness of the first heat-seal layer is 50 μm or more and 100 μm or less.

5. The pouch cell according to claim 1, wherein the first heat-seal layer and the second heat-seal layer are both made of a polypropylene material.

6. The soft package battery according to claim 1, wherein a tab (11) is further disposed outside the body (1), the tab (11) is disposed on the same side of the exhaust pipe (2), the exhaust pipe (2) comprises a first pipe portion inserted inside the body (1) and a second pipe portion (21) exposed outside the body (1), and the length of the second pipe portion (21) in the axial direction thereof is less than or equal to the length of the tab (11) in the axial direction of the exhaust pipe (2).

7. The pouch cell according to claim 6, wherein the length of the first tube part in the axial direction thereof is greater than or equal to the seal width of the pouch cell top package.

8. The pouch battery according to claim 1, characterized in that the side of the vent-pipe (2) away from the body (1) is provided with a one-way valve (22).

9. A heat-sealing die, characterized in that it is configured to heat-seal a pouch battery according to any one of claims 1 to 8, so as to fixedly connect the exhaust tube (2) and the body (1).

10. Heat-sealing die according to claim 9, characterised in that it is provided with a housing groove configured to house the interface area of the exhaust pipe (2) and the body (1).

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