CN212161861U

CN212161861U - Laminate polymer battery structure

Info

Publication number: CN212161861U
Application number: CN202020826724.2U
Authority: CN
Inventors: 苏岩; 曹鹏华; 王科技; 黄强; 柳春雷; 徐宏阳; 顾凯旋; 梁亚东; 陈辉
Original assignee: Jiewei Power Industry Jiaxing Co ltd
Current assignee: Jiewei Power Industry Jiaxing Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2020-12-15
Anticipated expiration: 2030-05-18

Abstract

The utility model provides a laminate polymer battery structure, includes electric core and heat-seal aluminium-plastic film outside electric core, the regional heat-seal of aluminium-plastic film has the structure, be equipped with in the structure with aluminium-plastic film and the communicating route in the external world, the outer opening on route is a sealed hole, sealed hole is equipped with detachable end cap. The utility model can greatly save the width of the air bag and has obvious effect on reducing the cost; after the negative pressure formation is adopted, the pressurization of the cell main body can be cancelled, and the input cost of the formation equipment is reduced along with the negative pressure formation.

Description

Laminate polymer battery structure

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to laminate polymer battery structure.

Background

In the process of first charging and formation of a lithium battery, a small amount of polar aprotic solvent in an electrolyte generates a reduction reaction after obtaining part of electrons, the reduction reaction is combined with lithium ions to generate an SEI (solid electrolyte interphase) film with the thickness of about 100-120nm, the reaction is accompanied with the generation of gas while the reaction is carried out, the gas generated by the discharge reaction is particularly important for first charging, if the gas is unfavorable to discharge, the separation of a positive electrode, a negative electrode and a diaphragm is generated due to the existence of the gas, the SEI film is finally uneven and incomplete, and the lithium ions can be precipitated on the negative electrode, the precipitation of the metal lithium not only affects the electrical property of the battery, but also the precipitation of the metal lithium can pierce the diaphragm, so that the thermal runaway of the battery due to internal short circuit is caused, and the discharge of the gas is particularly critical.

Soft package lithium ion battery is for collecting the gas that the formation in-process produced, keeps the air pocket of certain length in battery structure usually, seals the air pocket after annotating the liquid, becomes in-process and exerts the constraining force to the main part of battery, and the gas that the formation produced can be because of the effect of constraining force moves to the air pocket position, punctures, cuts, heat-seal the air pocket after waiting to become to finish.

The structure of the reserved air bag can not completely ensure that all generated gas is transferred into the air bag in the formation process, and the generated gas easily enters the electric core main body, so that the electric performance of the electric core is reduced and the risk of thermal runaway exists. The formation process is the best mode if negative pressure exhaust is adopted, but the structure of the reserved air bag is very difficult to realize the negative pressure exhaust function, and meanwhile, the structural air bag of the reserved air bag needs to be cut off after formation, so that the material cost of the battery aluminum plastic film is increased.

In terms of the formation equipment, the input cost of the pressurization formation equipment is greatly increased due to the constraint force applied to the main body of the battery in the structural requirement of the reserved gas bag. Meanwhile, the problem of sucking out the electrolyte is not considered in a general negative pressure formation mode, and due to the special structure of the soft package battery, the battery is not suitable for liquid supplement after formation, so that the sucked-out electrolyte needs to be sucked into the battery again after the vacuum formation is finished.

Disclosure of Invention

For solving the above-mentioned problem that prior art exists, the utility model provides a save the air pocket width greatly, have to reduce cost and show effect, cancel the pressor laminate polymer battery structure to electric core main part.

The utility model adopts the technical proposal that:

the utility model provides a laminate polymer battery structure, includes electric core and heat-seal aluminium-plastic film outside electric core, its characterized in that: the heat-sealing area of the aluminum-plastic film is heat-sealed with a structural part, a passage for communicating the aluminum-plastic film with the outside is arranged in the structural part, the outer opening of the passage is a sealing hole, and the sealing hole is provided with a detachable plug. The utility model can greatly save the width of the air bag and has obvious effect on reducing the cost; after the negative pressure formation is adopted, the pressurization of the cell main body can be cancelled, and the input cost of the formation equipment is reduced along with the negative pressure formation;

further, the structural part comprises a main body, the main body is heat-sealed at the heat-sealing area, the outer end of the main body is provided with a crown part, and the sealing hole is formed in the crown part.

Further, the passageway is disposed along the length from the seal bore to the inner end of the body.

Further, the both ends of electricity core are provided with anodal ear and negative pole ear respectively, the tip of anodal ear and negative pole ear exposes the plastic-aluminum membrane setting.

Further, the structural member is made of polypropylene materials.

Further, the total length of the structural member is 10mm-200mm, the main body is cylindrical, the outer diameter is 2-10mm, the outer diameter of the crown is 10-30mm, the inner diameter of the passage is 1-9mm, and the inner diameter of the sealing hole is 5-25 mm.

Further, the plug is a rubber plug.

Further, the structural member is heat-sealed at any position of the right heat-sealed area.

Or the structural member is heat-sealed in the right area of the positive electrode tab in the upper heat-sealed area or the right area of the negative electrode tab in the lower heat-sealed area.

Further, the right side part of the aluminum-plastic film on the battery cell is an air bag, and the air bag accounts for 45-60%. Because the gas can be discharged through the structural part, the width of the air bag can be greatly saved, and the cost is obviously reduced.

The utility model has the advantages that:

1. the width of the air bag can be greatly saved, and the air bag has obvious effect on reducing the cost;

2. after the negative pressure formation is adopted, the pressurization of the cell main body can be cancelled, and the input cost of the formation equipment is reduced along with the negative pressure formation;

3. the structure can be connected with a liquid storage cup of corresponding equipment in the formation process, even if electrolyte is sucked out, the electrolyte can be stored in the liquid storage cup, and along with the breaking of external vacuum, the sucked electrode liquid can also return to a battery from the liquid storage cup;

4. by adopting the connecting structural part, the structural part can be sealed by using the rubber plug before the final side edge is packaged, the battery is ensured not to be the same as the outside, and the rubber plug is widely applied to the aluminum-shell battery and has high maturity.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a schematic structural diagram of the structural member of the present invention.

In the figure: 1. negative electrode tab, 2, cell, 3, right side heat-seal area, 4, positive electrode tab, 5, structural member, 6, upper side heat-seal area, 7, lower side heat-seal area, 8, body, 9, crown, 10, seal hole, 11, channel

Detailed Description

The present invention will be further described with reference to the following specific embodiments, but the present invention is not limited to these specific embodiments. It will be recognized by those skilled in the art that the present invention encompasses all alternatives, modifications, and equivalents as may be included within the scope of the claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by 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. 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.

Referring to fig. 1 and fig. 2, this embodiment provides a laminate polymer battery structure, including electric core 2 and the plastic-aluminum membrane of heat-seal outside electric core 2, the both ends of electric core 2 are provided with anodal ear 4 and negative pole ear 1 respectively, the setting of plastic-aluminum membrane is exposed to the tip of anodal ear 4 and negative pole ear 1.

In the embodiment, the structural member 5 is heat-sealed in the heat-sealed area of the aluminum plastic film, and the structural member 5 is made of a polypropylene material. The structure 5 is heat sealed to any position of the right side heat seal area 3. Alternatively, the structure 5 is heat-sealed in the region to the right of the positive electrode tab 4 in the upper heat-sealed region 6 or in the region to the right of the negative electrode tab 1 in the lower heat-sealed region 7. The heat sealing position of the structural member 5 is set as desired.

In this embodiment, a passage 11 for communicating the aluminum plastic film with the outside is arranged in the structural member 5, an outer opening of the passage 11 is a sealing hole 10, the sealing hole 10 is provided with a removable plug, and the plug is a rubber plug and is a universal member. Specifically, the structural member 5 comprises a main body 8, the main body 8 is heat sealed at a heat sealing area, a crown portion 9 is arranged at the outer end of the main body 8, and the sealing hole 10 is arranged at the crown portion 9. The passageway 11 is provided along the length from the sealing bore 10 to the inner end of the body 8.

The total length of the structural member in this embodiment is 10mm to 200mm, the main body is cylindrical, the outer diameter is 2 mm to 10mm, the outer diameter of the crown is 10mm to 30mm, the inner diameter of the passage is 1 mm to 9mm, and the inner diameter of the sealing hole is 5mm to 25 mm.

In the embodiment, the right side part of the aluminum-plastic film on the battery core is an air bag, and the air bag accounts for 45-60%. Since the gas can be released through the structural member 5, the width of the gas bag can be greatly saved, which has a significant effect on reducing the cost.

The utility model discloses after the top side seal of laminate polymer battery is accomplished, at pre-buried structure 5 of original air pocket side, the material is polypropylene or other materials that can carry out the hot melt with the plastic-aluminum membrane, structure 5 is direct encapsulates with plastic-aluminum membrane air pocket side, in the pre-buried banding of structure, accomplish the encapsulation at electric core four sides before annotating the liquid and only reserve a structure and communicate with each other with the external world, the inside through-hole that is of structure 5, the top external diameter that structure 5 leaks the part outward is greater than all the other parts, form a platform, when the formation, vacuum chuck can laminate the inside through-hole of this platform sealed structure, can form the negative pressure to battery inside through the structure after the outside pipeline produces the negative pressure, the gas that the formation in-process produced can discharge with it.

After the packaging of the utility model is completed, the liquid injection process carries out the liquid injection action through the structural part 5, and before the liquid injection, the structural part is positioned by the positioning mechanism, thereby ensuring that the liquid injection port is tightly connected with the crown part 9 and achieving the purpose of completely sealing the sealing hole 10; after the liquid injection is finished, the structural member is positioned by a positioning mechanism, after the positioning is finished, a sealing rubber nail or a rubber plug is inserted into a sealing hole 10 to finish the sealing of the battery cell, the sealed battery is placed in a plastic tray, and the tray structure has the design of supporting and primarily positioning the structural member; before formation, the structural part is positioned by a positioning mechanism, after the positioning is finished, the sealing rubber nail or the rubber plug is pulled out from the sealing hole 10, and the sealing rubber nail or the rubber plug is cleaned and then reused; during formation, the battery is placed in the tray and does not need to be taken out of the tray, the positioning mechanism positions the structural part, the tray is jacked up after the positioning is finished, and the vacuum chuck battery of the formation equipment is tightly connected with the crown part 9 and completely seals the sealing hole 10; a liquid storage cup is arranged on the upper side of the vacuum chuck, the electrolyte sucked out after the negative pressure starts is stored in the liquid storage cup, the action of breaking vacuum is firstly carried out on the liquid storage cup after the formation is finished, and the electrode liquid in the liquid storage cup is sucked into the battery again under the action of the negative pressure in the battery; after the actions are completed, the battery and the sucker are separated to complete the whole process of negative pressure formation, the structural part is positioned by the positioning mechanism after the negative pressure formation is completed, and the sealing rubber nail or the rubber plug is inserted into the sealing hole 10 after the positioning is completed to complete the sealing of the battery core, so that the next procedure is carried out.

The utility model provides an electricity core structure after top side seal, air pocket side width that can significantly reduce of this kind of structure further reduces laminate polymer battery plastic-aluminum membrane material cost to neotype electricity core structure can be applicable to the negative pressure and become, adopts the negative pressure to become and to cancel the pressurization to electric core main part after, and it also can descend thereupon to become equipment input cost. In addition, the structure can be connected with a liquid storage cup of corresponding equipment in the formation process, even if electrolyte is sucked out, the electrolyte can be stored in the liquid storage cup, and the sucked electrode liquid can also return to the battery from the liquid storage cup along with the breaking of external vacuum.

It should be noted that the above embodiments can be freely combined as necessary. The foregoing has been a detailed description of the preferred embodiments and principles of the present invention, and it will be apparent to those skilled in the art that variations may be made in the specific embodiments based on the concepts of the present invention, and such variations are considered as within the scope of the present invention.

Claims

1. The utility model provides a laminate polymer battery structure, includes electric core and heat-seal aluminium-plastic film outside electric core, its characterized in that: the heat-sealing area of the aluminum-plastic film is heat-sealed with a structural part, a passage for communicating the aluminum-plastic film with the outside is arranged in the structural part, the outer opening of the passage is a sealing hole, and the sealing hole is provided with a detachable plug.

2. The pouch cell structure of claim 1, wherein: the structural part comprises a main body, the main body is heat-sealed at a heat-sealing area, a crown part is arranged at the outer end of the main body, and a sealing hole is formed in the crown part.

3. The pouch cell structure of claim 2, wherein: the passageway is disposed along the length from the seal bore to the inner end of the body.

4. The pouch cell structure of claim 1, wherein: the right side part of the aluminum-plastic film on the battery cell is an air bag, and the air bag accounts for 45-60%.

5. The pouch cell structure of claim 1, wherein: the two ends of the battery cell are respectively provided with a positive electrode lug and a negative electrode lug, and the end parts of the positive electrode lug and the negative electrode lug are exposed out of the aluminum plastic film.

6. The pouch cell structure of claim 1, wherein: the structural member is made of polypropylene materials.

7. The pouch cell structure of claim 2, wherein: the total length of the structural member is 10mm-200mm, the main body is cylindrical, the outer diameter of the main body is 2-10mm, the outer diameter of the crown is 10-30mm, the inner diameter of the passage is 1-9mm, and the inner diameter of the sealing hole is 5-25 mm.

8. The pouch cell structure of claim 1, wherein: the plug is a rubber plug.

9. The pouch cell structure of claim 1, wherein: the structural member is heat sealed at any position of the right heat sealed area.

10. The pouch cell structure of claim 1, wherein: the structural member is heat-sealed in the right area of the positive electrode tab in the upper heat-sealing area or the right area of the negative electrode tab in the lower heat-sealing area.