CN219321412U - Packaging structure of soft package battery core - Google Patents
Packaging structure of soft package battery core Download PDFInfo
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- CN219321412U CN219321412U CN202223365397.3U CN202223365397U CN219321412U CN 219321412 U CN219321412 U CN 219321412U CN 202223365397 U CN202223365397 U CN 202223365397U CN 219321412 U CN219321412 U CN 219321412U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of batteries, and particularly discloses a packaging structure of a soft-package battery core, which comprises a top sealing line, a side sealing line and a corner sealing line, wherein the corner sealing line is arranged between the top sealing line and the side sealing line, and is arc-shaped and protrudes towards a pit punching position, so that the corner sealing line can avoid a guide post arranged in a Block frame, and meanwhile, the area of an unsealed area at the top and the bottom is reduced, thereby being beneficial to the improvement of energy density. The corner sealing lines are connected with the side sealing lines through the straight transition sections, an overlapping area is formed between the straight transition sections and the side sealing lines, and the overlapping area is far away from the pit punching position, so that the situation that the plastic-aluminum film is damaged by friction in the subsequent use process due to glue overflow generated in the overlapping area is avoided, the situation of liquid leakage is avoided, and the sealing effect is good.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a packaging structure of a soft-package battery core.
Background
Lithium ion batteries are receiving increasing attention as an important component of electric vehicles, in particular, their energy density, safety, durability, and the like. The soft-package battery core is used as a basic unit of the lithium ion battery, and the performance and the structure of the soft-package battery core have decisive influence on the energy density, the safety, the durability and the like of the lithium ion battery. Therefore, the safety and durability of the soft-package battery cell are ensured while the energy density is improved, and the method is an important point in industry research and development.
At present, in the module structure of lithium ion battery, in order to guarantee the accuracy of soft packet of electric core assembly, can set up the guide post in the Block frame generally, in order to dodge this position, can adopt two kinds of technical scheme often: firstly, the length of the core pack body is shortened, but the space utilization rate inside the module is reduced, so that the energy density is reduced; secondly, the four corners of the core pack body are cut off at oblique angles, then the corner seal is directly carried out in the packaging procedure, bad degassing and bubble generation can possibly be caused, the product quality is poor, the production energy consumption is large, and under the conditions of large chamfer area and oblique angle, the included angle between the corner seal line and the side seal line of the core pack body is close to the pit corner of the core pack body, the leakage is easy to occur, and the sealing effect is poor.
Therefore, a package structure of the soft package is needed to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to provide a packaging structure of a soft-package battery cell, wherein a corner sealing line is in an arc shape, and is in arc transition with a side sealing line, so that the corner cutting area is reduced, the packaging structure is good in sealing, and liquid leakage is not easy to occur.
To achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a packaging structure of a soft package battery core, which is used for packaging a core package body in an aluminum plastic film, wherein two opposite sides of the core package body along the length direction of the core package body are provided with lugs, the ends of the lugs extend out of the aluminum plastic film and are arranged, the packaging structure of the soft package battery core comprises a top sealing line and a side sealing line, a corner sealing line is arranged between the top sealing line and the side sealing line, the corner sealing line is arc-shaped, the corner sealing line is connected with the top sealing line through an arc transition section, and the corner sealing line is connected with the side sealing line through a straight line transition section.
Optionally, a punching pit is arranged on the aluminum plastic film, external corner arcs and internal corner arcs are arranged at four corners of the punching pit, an overlapping area is arranged between the straight line transition section and the side sealing line, and the shortest distance between the overlapping area and the external corner arcs is L d The L is d The value range of (2) is L d ≥2.5mm。
Optionally, a punching pit is arranged on the aluminum plastic film, external corner arcs and internal corner arcs are arranged at four corners of the punching pit, an overlapping area is arranged between the straight line transition section and the side sealing line, and the shortest distance between the overlapping area and the external corner arcs is L d The L is d The value range of (2) is L d ≥4.0mm。
The pit is a single pit, and four corners of the single pit are respectively provided with the external corner arc and the internal corner arc; or (b)
The punching pit is a double pit, and four corners at the outermost side in the double pit are respectively provided with an outer corner arc and an inner corner arc.
Optionally, the outer edge of the corner sealing line is formed by a first arc having a radius R b The inner edge of the corner sealing line is formed by a second circular arc with the radius of R d Radius R of the first arc b Radius R smaller than the second arc d The circle centers of the first arc and the second arc are arranged on the same side, and the first arc and the second arc are both arranged in an inward protruding mode.
Optionally, the outer edge of the arc transition section is formed by a third arc with radius R a The inner side edge of the arc transition section is formed by a fourth arc, and the half of the fourth arcThe diameter is R c Radius R of the third arc a Radius R smaller than the fourth arc c The circle centers of the third arc and the fourth arc are arranged on the same side, and the third arc and the fourth arc are both arranged in an outward protruding mode.
Optionally, the width of the top sealing line is L a The L is a The value range of (2) is L a ≥3.5mm；
The width of the corner sealing line is L b The L is b The value range of (2) is L b ≥3.5mm；
The width of the side sealing line is L e The L is e The value range of (2) is L e ≥5.0mm。
Optionally, a distance between the initial position of the arc transition section and the tab is L c The L is c The value range of (2) is L c ≥3.0mm。
Optionally, after the corner cutting procedure, the outer edge of the corner sealing line is formed by a fifth circular arc and a straight line tangent to the fifth circular arc, wherein the radius of the fifth circular arc is R e 。
The beneficial effects of the utility model are as follows:
the utility model provides a packaging structure of a soft package battery core, which comprises a top sealing line, side sealing lines and corner sealing lines, wherein the corner sealing lines are arranged at four corners of a core package body, and the corner sealing lines are arranged between the top sealing line and the side sealing lines and are used for packaging corners of the core package body. The corner sealing line is arc-shaped and is protruded towards the pit punching position, so that the corner sealing line can avoid a guide column arranged in a Block frame, the area of an unsealed area at the top and the bottom is reduced, and the lifting of energy density is facilitated. The corner sealing line is connected with the top sealing line through the arc transition section, the corner sealing line is connected with the side sealing line through the straight line transition section, an overlapping area is formed between the straight line transition section and the side sealing line, and the overlapping area is far away from the pit punching position, so that the situation that the plastic-aluminum film is damaged due to friction in the subsequent use process caused by glue overflow in the overlapping area is avoided, the leakage is avoided, and the sealing effect is good.
Drawings
Fig. 1 is a schematic diagram of a partial structure of a package structure (not packaged) of a soft package battery cell according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a partial structure of a package structure (after package) of a soft package battery cell according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a partial structure of a package structure (after package) of a soft package battery core according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a package structure (after corner cutting) of a soft package battery core according to an embodiment of the present utility model;
fig. 5 is a partial enlarged view at D in fig. 4.
In the figure:
100. an aluminum plastic film; 200. a tab; 310. a top seal line; 320. a side seal line; 330. a corner seal line; 400. overlapping areas.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1-3, the present embodiment provides a packaging structure of a soft package battery core, where the packaging structure of the soft package battery core is used for packaging a core package body (not shown in the drawings) in an aluminum plastic film 100, two opposite sides of the core package body along the length direction of the core package body are provided with tabs 200, and ends of the tabs 200 extend out of the aluminum plastic film 100. In fig. 1, a schematic partial structure of the plastic-aluminum film 100 before packaging is shown, and in particular, a packaging mode may be selected for hot-press packaging. Further, in this embodiment, two plastic-aluminum films 100 are selected, a pit is punched on one plastic-aluminum film 100, the other Zhang Lv plastic film 100 is kept in a flat plate shape, after the pit is punched on one plastic-aluminum film 100, the two plastic-aluminum films 100 are aligned, then the core pack body is placed in the pit punching position, the tab 200 is connected with the core pack body, and the tab 200 is led out from the length direction of the core pack to the outer side of the plastic-aluminum film 100. In some embodiments, when the two plastic-aluminum films 100 are each provided with a pit, the pit depth of the two plastic-aluminum films 100 may be the same or different, which is not limited in this embodiment.
With continued reference to fig. 2 and 3, after the core package body and the plastic-aluminum film 100 are fixed through the encapsulation frock, set up the packaging structure of the soft packet electric core around the core package body, the packaging structure of the soft packet electric core includes top seal line 310, side seal line 320 and bight seal line 330, wherein, top seal line 310 sets up along the length direction of core package body, can encapsulate the core package body along its length direction's relative two sides through top seal line 310, side seal line 320 sets up along the width direction of core package body, is used for the encapsulation through side seal line 320 the two sides of core package body along its width direction, bight seal line 330 sets up in the four corners department of core package body, and bight seal line 330 sets up between top seal line 310 and side seal line 320 for encapsulate the bight of core package body. After the packaging process is finished, the corner sealing line 330 in the embodiment is arc-shaped and protrudes towards the pit position, so that the corner sealing line 330 can avoid the guide post arranged in the Block frame, the use of the area of the unsealed area at the top and the bottom is reduced, and the improvement of the energy density is facilitated.
As an alternative, the corner sealing line 330 is connected with the top sealing line 310 through an arc transition section, the corner sealing line 330 is connected with the side sealing line 320 through a straight line transition section, an overlapped area 400 is formed between the straight line transition section and the side sealing line, a punching pit is arranged on the aluminum plastic film 100, four corners of the punching pit are respectively provided with an external corner arc and an internal corner arc, and the shortest distance between the overlapped area 400 and the external corner arc of the punching pit is L d ，L d The value range of (2) is L d And is more than or equal to 2.5mm. Because the overlapping area 400 is far away from the arc position of the outer corner of the punching pit, the situation that the plastic-aluminum film 100 is damaged by friction in the subsequent use process due to glue overflow generated by the overlapping area 400 is avoided, the situation of liquid leakage is avoided, and the sealing effect is good.
In some embodiments, referring to fig. 3, the punched pit of the aluminum plastic film 100 is a single pit, and four corners of the single pit are provided with an outer corner arc and an inner corner arc, wherein the outer corner arc refers to a corner transition arc on the outer wall surface of the aluminum plastic film 100, and the circle thereofThe center position is point A, the inner corner arc is the corner transition arc on the inner wall surface of the aluminum plastic film 100, and the center position is point B. The shortest distance between the overlapping area 400 and the outer corner arc of the pit is L d ，L d Namely, the distance between the point C (the position of the intersection of the inner edge of the straight transition section and the inner edge of the side seal line 320) and the point A, L d The value range of (2) is L d And is more than or equal to 2.5mm. For example, L d Can be set to 2.5mm, 2.7mm, 2.9mm, 3.0mm, 3.2mm or 3.4mm, etc., and can be specifically adjusted according to the pit depth h, and the comparison of the embodiment is not limited. Therefore, in this embodiment, the overflow glue generated in the overlapping area 400 between the straight transition section and the side sealing line 320 on the plastic-aluminum film 100 is far away from the outer corner arc of the pit punching position, so as to effectively reduce the leakage risk of the full life cycle of the soft package battery core, avoid the overflow glue generated in the overlapping area 400 to approach the outer corner arc, and cause the higher overflow glue to continuously rub the pit punching corner in the vehicle use process, thereby damaging the plastic-aluminum film 100 and further generating the condition of corrosive leakage.
Further, when the pit depth h of the single pit is large, namely the pit depth h is more than or equal to 5.0mm. At this time, the radius of the outer corner arc of the single pit is large, resulting in a large stretched area of the aluminum plastic film 100, L d The value range of (2) may further preferably be L d And the glue overflow distance is more than or equal to 4.0mm, so that the glue overflow distance is more than or equal to the pit flushing position, and the risk of liquid leakage is further reduced. In this embodiment, the pit depth may be set to h=5.2 mm, l d ＝6.0mm。
Of course, in some embodiments, the punch pits may also be provided as double pits, wherein the four corners of the double pits located at the outermost sides are each provided with an outer corner arc and an inner corner arc. L (L) d I.e. the distance between the intersection point of the inner edge of the straight transition section and the inner edge of the side seal line 320 and the center of the outer corner arc located at the outermost side in the double pit, L d The value range of (2) is L d And is more than or equal to 2.5mm. For example, L d Can be set to 2.5mm, 2.7mm, 2.9mm, 3.0mm, 3.2mm or 3.4mm, etc., and can be specifically adjusted according to the pit depth h, and the comparison of the embodiment is not limited.
The outer edge of the corner seal line 330 in this embodiment is formed by a first arc having a radius R b The inner edge of the corner seal line 330 is formed by a second arc having a radius R d Radius R of the first arc b Radius R smaller than the second arc d The circle centers of the first arc and the second arc are arranged on the same side, and the first arc and the second arc are both arranged in an inward protruding mode, namely protruding towards the direction of the core bag body. In some embodiments, the radius R of the first arc b Can be set to 4mm, and the radius R of the second circular arc d Can be set to 14mm, and the center of the first circular arc and the center of the second circular arc are arranged in a different manner. Of course, in other embodiments, the center of the first arc and the center of the second arc may be disposed concentrically.
Further, the outer edge of the arc transition section is formed by a third arc with a radius R a The inner side edge of the arc transition section is formed by a fourth arc with the radius of R c Radius R of third arc a Radius R smaller than the fourth arc c The circle centers of the third arc and the fourth arc are arranged on the same side, and the third arc and the fourth arc are outwards protruded, namely protruded in the direction away from the core bag body. In some embodiments, the radius R of the third arc a Can be set to be 1mm, and the radius R of the fourth circular arc c Can be set to 2mm, thereby enabling the round transition between the corner sealing line 330 and the top sealing line 310, avoiding the puncture of the aluminum plastic film 100 caused by edges, corners and the like, and ensuring good sealing.
Further, referring to fig. 2, the top seal line 310 has a width L a ，L a The value range of (2) is L a Not less than 3.5mm, the width of the corner sealing line 330 is L b ，L b The value range of (2) is L b Not less than 3.5mm, the width of the side seal line 320 is L e ，L e The value range of (2) is L e And is more than or equal to 5.0mm. In the present embodiment, L is a ＝5.0mm，L b ＝5.5mm，L e The example is illustrated with a value of 8.6 mm.
Further, with continued reference to fig. 4 and 5, the corner seal line 330 is sealed to the topThe distance between the initial position of the arc transition section between the seal lines 310 and the tab 200 is L c ，L c The value range of (2) is L c And is more than or equal to 3.0mm. Illustratively, L in this embodiment c =6.0 mm. After the packaging process is completed, when the corner cutting process is performed, the starting position of cutting is the starting position of the arc transition section, and when cutting, the outer edge of the corner sealing line 330 is formed by a fifth arc and a straight line tangent to the fifth arc, wherein the radius of the fifth arc is R e . Illustratively, re=6.0 mm in this embodiment. Finally, the outer edges formed by the fifth circular arc and the straight line tangent to the fifth circular arc are formed at the four corner seal lines 330 of the core pack body.
After the packaging process of the top sealing line 310 and the side sealing line 320 is completed, the four corners of the aluminum plastic film 100 are subjected to corner sealing, the corner sealing is performed by adopting the arc-shaped corner sealing line 330, then the corner sealing line 330 and the side sealing line 320 are cut by using a tool die (as shown in fig. 4 and 5), then the side is folded, the metal part in the middle of the aluminum plastic film 100 is wrapped in the folded edge, the packaging structure of the soft package battery core in the embodiment is adopted for packaging, the difficulty of the soft package battery core during assembly is improved, meanwhile, the unsealed space in the soft package battery core is reduced, sufficient space is provided for the gas production of the whole life cycle of electrolyte and the core package body, the risk of expanding in the EOL stage of the soft package battery core is reduced, the assembly space is saved, the energy density is improved, and the sealing effect is good, and the condition of liquid leakage is not easy to occur.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (9)
1. The utility model provides a packaging structure of soft packet of electric core for with core package body encapsulation in plastic-aluminum membrane (100), core package body all is equipped with utmost point ear (200) along its length direction's relative both sides, the tip of utmost point ear (200) stretches out plastic-aluminum membrane (100) set up, its characterized in that:
the packaging structure of the soft-package battery cell comprises a top sealing line (310) and a side sealing line (320), wherein a corner sealing line (330) is arranged between the top sealing line (310) and the side sealing line (320), the corner sealing line (330) is arc-shaped, the corner sealing line (330) is connected with the top sealing line (310) through an arc transition section, and the corner sealing line (330) is connected with the side sealing line (320) through a straight line transition section.
2. The package structure of the soft package battery core according to claim 1, wherein the aluminum plastic film (100) is provided with a punching pit, four corners of the punching pit are respectively provided with an outer corner arc and an inner corner arc, an overlapping area (400) is arranged between the straight transition section and the side sealing line (320), and the shortest distance between the overlapping area (400) and the outer corner arc is L d The L is d The value range of (2) is L d ≥2.5mm。
3. The package structure of the soft package battery core according to claim 1, wherein the aluminum plastic film (100) is provided with a punching pit, four corners of the punching pit are respectively provided with an outer corner arc and an inner corner arc, an overlapping area (400) is arranged between the straight transition section and the side sealing line (320), and the shortest distance between the overlapping area (400) and the outer corner arc is L d The L is d The value range of (2) is L d ≥4.0mm。
4. The package structure of a soft package battery cell according to claim 2 or 3, wherein the punching pit is a single pit, and four corners of the single pit are provided with the outer corner arc and the inner corner arc; or (b)
The punching pit is a double pit, and four corners at the outermost side in the double pit are respectively provided with an outer corner arc and an inner corner arc.
5. The package structure of the soft package battery cell according to claim 1, wherein the outer edge of the corner sealing line (330) is formed by a first arc having a radius R b The inner edge of the corner sealing line (330) is formed by a second circular arc with a radius R d Radius R of the first arc b Radius R smaller than the second arc d The circle centers of the first arc and the second arc are arranged on the same side, and the first arc and the second arc are both arranged in an inward protruding mode.
6. The package structure of the soft package battery cell according to claim 5, wherein the outer edge of the arc transition section is formed by a third arc, and the radius of the third arc is R a The inner side edge of the arc transition section is formed by a fourth arc, and the radius of the fourth arc is R c The radius Ra of the third arc is smaller than the radius R of the fourth arc c The circle centers of the third arc and the fourth arc are arranged on the same side, and the third arc and the fourth arc are both arranged in an outward protruding mode.
7. The package structure of the soft package battery cell according to claim 1, wherein the width of the top sealing line (310) is L a The L is a The value range of (2) is L a ≥3.5mm；
The width of the corner sealing line (330) is L b The L is b The value range of (2) is L b ≥3.5mm；
The width of the side sealing line (320) is L e The L is e The value range of (2) is L e ≥5.0mm。
8. The package structure of a soft package battery cell according to claim 1, whereinThe distance between the initial position of the arc transition section and the lug (200) is L c The L is c The value range of (2) is L c ≥3.0mm。
9. The package structure of the soft package battery cell according to claim 1, wherein after the corner cutting process, the outer edge of the corner sealing line (330) is formed by a fifth arc and a straight line tangent to the fifth arc, and the radius of the fifth arc is R e 。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223365397.3U CN219321412U (en) | 2022-12-15 | 2022-12-15 | Packaging structure of soft package battery core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223365397.3U CN219321412U (en) | 2022-12-15 | 2022-12-15 | Packaging structure of soft package battery core |
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| CN219321412U true CN219321412U (en) | 2023-07-07 |
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| CN202223365397.3U Active CN219321412U (en) | 2022-12-15 | 2022-12-15 | Packaging structure of soft package battery core |
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