CN203351680U - Positive plate diaphragm bag and laminated lithium ion battery with positive plate diaphragm bag - Google Patents
Positive plate diaphragm bag and laminated lithium ion battery with positive plate diaphragm bag Download PDFInfo
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- CN203351680U CN203351680U CN2013203086363U CN201320308636U CN203351680U CN 203351680 U CN203351680 U CN 203351680U CN 2013203086363 U CN2013203086363 U CN 2013203086363U CN 201320308636 U CN201320308636 U CN 201320308636U CN 203351680 U CN203351680 U CN 203351680U
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical class [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000003466 welding Methods 0.000 claims description 17
- 239000012943 hotmelt Substances 0.000 claims description 9
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 49
- 238000002844 melting Methods 0.000 abstract description 3
- 239000002985 plastic film Substances 0.000 description 67
- 229920006255 plastic film Polymers 0.000 description 67
- 238000007789 sealing Methods 0.000 description 50
- 238000000034 method Methods 0.000 description 30
- 238000002360 preparation method Methods 0.000 description 27
- 229910052782 aluminium Inorganic materials 0.000 description 26
- 230000008569 process Effects 0.000 description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 19
- 238000003825 pressing Methods 0.000 description 18
- 239000010410 layer Substances 0.000 description 16
- 239000007788 liquid Substances 0.000 description 13
- 238000005452 bending Methods 0.000 description 10
- 238000004806 packaging method and process Methods 0.000 description 10
- 239000012528 membrane Substances 0.000 description 9
- 238000007731 hot pressing Methods 0.000 description 8
- 238000003475 lamination Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000002349 favourable effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000005429 filling process Methods 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model relates to the field of lithium ion batteries and discloses a positive plate diaphragm bag and a laminated lithium ion battery with the positive plate diaphragm bag. The positive plate diaphragm bag is characterized by comprising a first diaphragm, a second diaphragm and a positive plate, wherein the first diaphragm and the second diaphragm are positioned over against the top and the bottom of the positive plate respectively; a heat-seal seal is formed on at least one width end part of the first diaphragm and the second diaphragm respectively; the first diaphragm and the second diaphragm are in hot-melting connection at the heat-seal seal. By adopting the technical scheme, the product appearance is improved and the electrochemical performance is improved.
Description
Technical Field
The utility model relates to a lithium ion battery field, in particular to positive plate diaphragm bag and take lamination lithium ion battery of this positive plate diaphragm bag.
Background
Lithium ion batteries are widely used because of their high energy density, high output voltage, high output power, and other advantages. The existing lithium ion battery is mainly in the shape of a cylinder, a square, a button and the like, but along with the continuous expansion of the application of the lithium ion battery to various fields, the lithium ion battery in other shapes is more and more concerned, for example, the lithium ion battery applied to a pedometer needs a bent lithium ion battery.
In the course of the research of the present invention, the inventor finds that the prior art has at least the following problems:
at present, the bent lithium ion battery in the market is bent by using a jig after the battery is manufactured, so that a pole piece and a structure of the battery are damaged to a great extent, the electrochemical performance of the battery is reduced, and potential safety hazards also exist; in addition, the battery surface is wrinkled during the process of bending the battery, and the appearance is hard to look.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide positive plate diaphragm bag and take this positive plate diaphragm bag's lamination lithium ion battery, use this technical scheme to be favorable to improving the product appearance, improve electrochemical performance.
The embodiment of the utility model provides a pair of positive plate diaphragm bag, include: a first diaphragm, a second diaphragm and a positive plate,
the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of the positive plate;
and respectively forming heat-seal seals on at least one width end part of the first diaphragm and the second diaphragm, wherein the first diaphragm and the second diaphragm are in hot-melt connection at the heat-seal seals.
Optionally, at least two of the seals are formed on the width ends that are not continuous with each other.
Optionally, a continuous heat seal is formed on the widthwise ends.
Optionally, the heat-seal is formed on the first separator, the second separator, and the first width end portion of the positive electrode sheet where the tab welding portion protrudes.
Optionally, the heat-seal seals are formed on the second width ends of the first and second separators opposite to the tab welding portion of the positive electrode sheet.
Optionally, the heat-seal seals are formed on both the width ends of the first and second diaphragms.
The laminated lithium ion battery provided by the embodiment comprises a negative plate and a positive plate diaphragm bag which are mutually laminated,
the positive plate diaphragm bag includes: a first diaphragm, a second diaphragm and a positive plate,
the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of the positive plate;
respectively forming heat-seal seals on at least one width end part of the first diaphragm and the second diaphragm, wherein the first diaphragm and the second diaphragm are in hot-melt connection at the heat-seal seals;
and a naturally formed arc-shaped diaphragm layer is respectively arranged between any positive plate and any negative plate at intervals.
Optionally, forming at least two of said seals on said width ends that are not continuous with each other; or,
forming a continuous said heat seal over said widthwise ends.
Optionally, the heat-seal is formed on the first diaphragm, the second diaphragm and the first width end part of the positive plate where the tab welding part extends out; or;
forming the heat-seal on the first diaphragm and the second diaphragm and on the second width end part opposite to the tab welding part of the positive plate; or,
and forming the heat-seal seals on the two width end parts of the first diaphragm and the second diaphragm.
As can be seen from the above, by applying the technical scheme of the present embodiment, compared with the prior art, by adopting the positive plate 500 bagging process shown in the second positive plate diaphragm bag preparation scheme, on one hand, the positioning of the positive plate 500 in the diaphragm bag is realized, and the problems of poor electrical performance, even short circuit and potential safety hazard of the lithium ion battery caused by the displacement of the positive plate 500 are avoided; on the other hand, in the second preparation scheme of the positive plate diaphragm bag, the diaphragm bag is packaged at any one of the two width end parts of the diaphragm or the two width end parts of the diaphragm in a heat sealing mode, so that at least two longitudinal edges of the diaphragm bag are communicated outwards, liquid can be better immersed into the positive plate 500 through the diaphragm bag during liquid injection, and the capacity and the electrical property of a large-size lithium ion battery are favorably improved compared with the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
fig. 1 is a schematic view of a process flow for preparing a laminated lithium ion battery provided in embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of a preparation scheme of a positive plate diaphragm bag provided in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a process of a preparation scheme of a positive plate diaphragm bag provided in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of three flow paths of a preparation scheme of a positive plate diaphragm bag provided in embodiment 1 of the present invention;
fig. 5 is a schematic structural view of a positive plate diaphragm bag manufactured in a process according to a preparation scheme of the positive plate diaphragm bag provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural view of a positive plate diaphragm bag manufactured in two processes according to the preparation scheme of the positive plate diaphragm bag provided in embodiment 1 of the present invention;
fig. 7 is a schematic structural view of a positive plate diaphragm bag manufactured by a three-flow process according to a preparation scheme of the positive plate diaphragm bag provided in embodiment 1 of the present invention;
fig. 8 is a schematic structural diagram of embodiments 1 and 2 of the present invention providing a device for naturally placing a stacked electrical core in a lithium ion stacked lamination forming device;
fig. 9 is a schematic structural diagram of another apparatus for forming a lithium ion laminated body according to embodiment 1 of the present invention;
fig. 10 is a schematic structural view of an aluminum-plastic film casing provided in embodiment 1 of the present invention;
fig. 11 is a schematic structural view of another aluminum-plastic film casing provided in embodiment 1 of the present invention;
fig. 12 is a schematic structural view of an arc-shaped aluminum-plastic film laminated lithium ion battery (the edge where the liquid injection port is located is not heat-sealed) provided in embodiments 1 and 2 of the present invention;
fig. 13 is a schematic structural view of an aluminum-plastic film arc laminated lithium ion battery provided in embodiments 1 and 2 of the present invention;
fig. 14 is a schematic structural view of an arc-shaped stacked electrical core provided in embodiments 1 and 2 of the present invention;
fig. 15 is a schematic structural view of a curved side sealing mold for an aluminum-plastic film shell provided in embodiments 1 and 2 of the present invention;
fig. 16 is a schematic side view of the aluminum-plastic film shell bending side sealing mold provided in embodiments 1 and 2 of the present invention;
figure 17 is a schematic top view of a curved side sealing die for an aluminum-plastic film shell provided in embodiments 1 and 2 of the present invention;
fig. 18 is a schematic view of a flow structure of plastic package of an aluminum plastic film casing provided in embodiments 1 and 2 of the present invention.
Reference numerals:
500: a positive plate; 501: a first longitudinal edge; 502: a second longitudinal edge;
601: a first width edge; 602: a second width edge; 5001: a tab welding part;
801: laminating the electric core; 802: an arc-shaped bracket; 803: an arc pressing die;
902: an arc-shaped bracket; 903: an arc pressing die; 1001: an aluminum plastic film shell cover sheet;
1002: the electric core body is concave; 1102: the electric core body is concave; 1301: a negative plate;
1201: a top end; 1401: an upper sealing part of the heat-sealing mould;
1402: and (4) heat-sealing the second lower sealing part of the die.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
referring to fig. 1 to 18, this embodiment provides a process for manufacturing a laminated lithium-ion battery, which mainly includes the following steps:
step 101: the lamination is carried out to obtain a laminated body.
In this step, negative electrode sheet 1301 and positive electrode sheet 500 are laminated to obtain laminated power core 801. In the obtained laminated electric core 801, a separator layer is interposed between each of the positive electrode sheet 500 and the negative electrode sheet 1301.
The step can be realized by adopting a lamination process of a single positive plate 500, a single diaphragm plate and a single negative plate 1301 in the prior art.
As an implementation illustration of this step, the present inventors provide the following lamination solution:
and putting the positive plate 500 into a diaphragm bag to obtain the positive plate diaphragm bag, and respectively putting a positive plate 500 into each positive plate diaphragm bag, so that the active coating layers on the top surface and the bottom surface of the positive plate 500 are covered with diaphragm layers. After each positive electrode pouch is manufactured, each negative electrode sheet 1301 and each positive electrode pouch may be stacked on each other.
The manufacturing of the positive plate diaphragm bag can be realized according to the prior art, namely, the positive plate 500 is arranged in the diaphragm bag with three closed sides, and the lug welding part 5001 of the positive plate 500 extends out of the width end part of the positive plate diaphragm bag.
As an implementation schematic of the step, the inventor also provides the following technical scheme for preparing the positive plate diaphragm bag:
the preparation scheme I of the positive plate diaphragm bag comprises the following steps: the positive plate 500 is respectively filled into each diaphragm bag according to the following bag filling process to obtain each positive plate diaphragm bag, which is shown in fig. 2 and 5, and the bag filling process is as follows:
step 201: a first separator and a second separator are respectively placed on the top surface and the bottom surface of each positive electrode plate 500.
The active component application region of the positive electrode sheet 500 is covered with the first separator and the second separator in a vertically opposed manner, and the tab welding portion 5001 extends from the first width end of the first separator and the second separator.
Step 202: and at least two longitudinal edges of the first diaphragm and the second diaphragm are heat-sealed, and a plurality of discontinuous heat-seal seals are respectively formed on the two longitudinal edges.
And the first diaphragm and the second diaphragm are in hot-melt connection at each heat-seal sealing position to obtain the positive plate diaphragm bag.
In the present step, the non-connected heat seal can be formed by performing spaced heat sealing only on the first longitudinal edge 501 and the second longitudinal edge 502 of the first membrane and the second membrane;
in this step, the first longitudinal edge 501, the second longitudinal edge 502, and the first width edge 601 of the first and second diaphragms may be heat-sealed at intervals to form heat seals that are not connected to each other;
in this step, the first longitudinal edge 501, the second longitudinal edge 502, the first width edge 601, and the second width edge 602 of the first and second diaphragms may be heat sealed at intervals to form heat seals that are not connected.
Compared with the prior art, the positive plate 500 bagging process shown in the scheme I is adopted, so that on one hand, the positive plate 500 in the diaphragm bag is positioned, and the problems of poor electrical performance, even short circuit and potential safety hazard of the lithium ion battery caused by the displacement of the positive plate 500 are avoided; on the other hand, in the first preparation scheme of the positive plate diaphragm bag, the diaphragm bag is packaged by adopting discontinuous interval heat sealing, so that the periphery of the diaphragm bag is provided with the openings communicated with the outside, and therefore, when liquid is injected, liquid can be better immersed into the positive plate 500 through the diaphragm bag, and the capacity and the electrical property of the laminated lithium ion battery are favorably improved compared with the prior art.
The second preparation scheme of the positive plate diaphragm bag: the positive plate 500 is respectively filled into each diaphragm bag according to the following bag filling process, so as to obtain each positive plate diaphragm bag, and the bag filling process is as follows, referring to fig. 3 and 6:
step 301: a first separator and a second separator are respectively placed on the top surface and the bottom surface of each positive electrode plate 500.
The active component application region of the positive electrode sheet 500 is covered with the first separator and the second separator in a vertically opposed manner, and the tab welding portion 5001 extends from the first width end of the first separator and the second separator.
Step 302: and heat-sealing at least one width end of the first diaphragm and the second diaphragm.
In the step, at least one width end part of the first diaphragm and the second diaphragm is heat sealed, a heat seal is formed on the heat sealed width end part, and the first diaphragm and the second diaphragm are in hot melt connection at the heat seal position, so that the positive plate diaphragm bag is obtained.
In this step, the above-mentioned technical scheme of discontinuous interval heat sealing can be adopted, and the technical scheme of continuous heat sealing can also be adopted.
In this step, the heat sealing may be performed only at the first width end portion protruding from the tab welding site of the first separator and the second separator, but not limited to only at the second width end portion opposite to the tab welding site, and also not limited to both width end portions.
Compared with the prior art, by adopting the positive plate 500 bagging process shown in the second preparation scheme of the positive plate diaphragm bag, on one hand, the positioning of the positive plate 500 in the diaphragm bag is realized, and the problems of poor electrical performance, even short circuit and potential safety hazard of the lithium ion battery caused by the displacement of the positive plate 500 are avoided; on the other hand, in the second preparation scheme of the positive plate diaphragm bag, the diaphragm bag is packaged at any one of the two width end parts of the diaphragm or the two width end parts of the diaphragm in a heat sealing mode, so that at least two longitudinal edges of the diaphragm bag are communicated outwards, liquid can be better immersed into the positive plate 500 through the diaphragm bag during liquid injection, and the capacity and the electrical property of a large-size lithium ion battery are favorably improved compared with the prior art.
The third preparation scheme of the positive plate diaphragm bag is as follows: the positive plate 500 is respectively filled into each diaphragm bag according to the following bag filling process, so as to obtain each positive plate diaphragm bag, and the bag filling process is as follows, referring to fig. 4 and 7:
step 401: a first separator and a second separator are respectively placed on the top surface and the bottom surface of each positive electrode plate 500.
The active component application region of the positive electrode sheet 500 is covered with the first separator and the second separator in a vertically opposed manner, and the tab welding portion 5001 extends from the first width end of the first separator and the second separator.
Step 402: and at least any two of the four top corners of the first diaphragm and the second diaphragm are thermally sealed to form a heat-seal.
In the step, the first diaphragm and the second diaphragm are connected at the heat-seal sealing opening in a hot-melting mode, and the positive plate diaphragm bag is obtained.
In this step, heat sealing can be performed only at any two vertex angles, any three vertex angles, or four vertex angles of the first vertex angle, the second vertex angle, the third vertex angle, and the fourth vertex angle of the first diaphragm and the second diaphragm, and the inventor of the present invention finds that, in the course of research of the present invention, when heat sealing is performed only at two vertex angles, the process of heat sealing at diagonal vertex angles is favorable for better positioning the positive plate 500; and the four vertex angles are adopted for heat sealing, so that the positive plate 500 can be completely positioned, and the displacement in any direction is avoided.
Compared with the prior art, by adopting the positive plate 500 bagging process shown in the second preparation scheme of the positive plate diaphragm bag, on one hand, the positioning of the positive plate 500 in the diaphragm bag is realized, and the problems of poor electrical performance, even short circuit and potential safety hazard of the lithium ion battery caused by the displacement of the positive plate 500 are avoided; on the other hand, this positive plate diaphragm bag preparation scheme two is owing to carry out the heat-seal at the at least two of four apex angles of diaphragm encapsulation at the diaphragm bag, makes four edges at the diaphragm bag all communicate to the outside, and like this when annotating the liquid, liquid can soak positive plate 500 through the diaphragm bag better, is favorable to improving lithium ion battery's capacity and electrical property greatly for prior art.
Step 102: the laminated electrical core 801 is fixed in the middle.
After the laminated electrical core body 801 is obtained in step 101, the middle portion of the laminated electrical core body 801 may be fixed by, but not limited to, gluing with adhesive tape, so that the two end portions of the laminated electrical core body 801 may naturally sag or naturally roll up under the effect of other upward forces.
Step 103: the arc-shaped hot-press laminates electrical core 801.
Referring to fig. 8, the middle fixed laminated electric core body 801 naturally rests on the top of the arc support 802 of the device for forming the lithium ion laminated stack, and the laminated electric core body 801 naturally clings to and covers the top of the arc support 802 due to the gravity to form an arc shape identical to the top arc shape.
The arc pressing die 803 above the arc supporter 802 is activated to press the lamination stack on the top of the arc supporter 802 at a predetermined pressure with a predetermined temperature of the arc pressing die 803,
the bottom of the arc pressing die 803 is formed with a second arc shape matching the arc shape of the top of the arc support 802, and when the arc pressing die 803 is covered on the top of the arc support 802, it can be in face-to-face contact with the top of the arc support 802. When the laminated electric core 801 is pressed, the arc pressing die 803 is in face-to-face contact with the laminated electric core 801 positioned on the top of the arc support 802, a certain pressure and temperature are uniformly applied to the surface of the laminated electric core 801, and under the action of hot pressing, the positive electrode sheet 500 and the negative electrode sheet 1301, which are adjacent to each other, of each diaphragm layer in the laminated electric core 801 are bonded to each other, that is, the whole laminated electric core 801 is bonded to each other into a whole through bonding of each diaphragm layer.
In this embodiment, the surface of the separator layer or the positive electrode sheet 500 or the negative electrode sheet 1301 may be coated with various materials that can be bonded to each other at a high temperature to achieve the bonding of the separator layer and the adjacent positive electrode sheet 500 or negative electrode sheet 1301.
As an illustration of this embodiment, the present inventors provide that a Polyvinylidene Fluoride (PVDF) material is coated on the top surface and the bottom surface of each separator layer of each separator bag, the PVDF layers are formed on the top surface and the bottom surface of each separator layer, and the hot-pressing temperature is set to a predetermined temperature during the hot-pressing, so that each PVDF layer of each separator layer is softened by heat (softening temperature is 112 to 145 ℃) under the pressure and temperature of the arc-shaped pressing mold 803, and is bonded to the adjacent positive electrode sheet 500 and negative electrode sheet 1301, thereby achieving the mutual bonding of each separator layer to each positive electrode sheet 500 and negative electrode sheet 1301.
In this step, during hot pressing, either the arc pressing mold 803 or the arc support 802 may have a certain temperature, or both may have a certain temperature, so as to improve the hot pressing effect and reduce the hot pressing time.
It should be noted that the structure of the device for forming a lithium ion laminated body of the present embodiment may be configured such that the top of the arc support 802 is configured as an upward-protruding arc as shown in fig. 8, or may be configured such that the top of the arc support 902 is configured as a first arc that is concave toward the bottom as shown in fig. 9, and when the laminated body is placed on the first arc, an upward-protruding arc is formed under the load of the first arc. The bottom of the arc pressing die 903 is set to be a second arc which is matched with the first arc and protrudes towards the bottom, so that the laminated body is pressed face to face.
Step 104: and standing and shaping the laminated electric core body 801 to obtain the arc-shaped laminated electric core body.
And after the hot pressing is carried out for a certain time, the hot pressing is stopped, the laminated electric core body 801 is allowed to stand at the top of the arc-shaped support 802 for a certain time, and the arc-shaped laminated electric core body is obtained after the arc-shaped laminated electric core body is shaped.
In the standing process of the laminated electric core body 801, the laminated electric core body can be stood at normal temperature or cooled and stood; during standing, the arc pressing mold 803 may apply a certain force to the laminated electrical core 801, or may not apply a force to naturally attach the laminated electrical core 801 to the top of the arc support 802 for shaping and forming due to the gravity of the laminated electrical core 801.
Step 105: and packaging the aluminum-plastic film in a shell.
The present embodiment further provides an aluminum-plastic film casing, and referring to fig. 10, the aluminum-plastic film casing of the present embodiment includes an aluminum-plastic film casing covering sheet 1001 and an electrical core concave portion 1002 at a lower position relative to the aluminum-plastic film casing covering sheet 1001. The top surface of the concave position 1002 of the electric core body is arc-shaped, the aluminum-plastic film casing covering sheet 1001 extends to the top of the concave position 1002 of the electric core body, so that after the arc-shaped laminated electric core body is assembled on the concave position 1002 of the electric core body, the aluminum-plastic film casing covering sheet 1001 covers the top surface of the concave position 1002 of the electric core body, the aluminum-plastic film casing covering sheet 1001 and the top surface of the concave position 1002 of the electric core body are naturally attached to the top surface of the arc-shaped electric core body in the aluminum-plastic film casing covering sheet 1001 under the action of gravity, then aluminum-plastic film heat sealing is carried out to.
In this step, the top surface of the electrical core concave portion 1002 of the aluminum-plastic film casing of this embodiment may be designed to be an arc shape that is concave upward and bottom as shown in fig. 10, or the top surface of the electrical core concave portion 1102 may be designed to be an arc shape that is convex upward and top as shown in fig. 11.
In this embodiment, since the electrical core concave 1002 of the aluminum-plastic film casing is arc-shaped, after the electrical core concave 1002 is covered with the aluminum-plastic film casing covering sheet 1001, when plastic packaging is performed on any edge around the electrical core concave 1002, the arc-shaped plastic packaging mold is adopted to perform plastic packaging in cooperation with the arc-shaped electrical core concave 1002, so that the arc-shaped aluminum-plastic film laminated lithium ion battery shown in fig. 12 is obtained.
As an illustration of the present embodiment: when carrying out plastic-aluminum membrane casing heat-seal, can carry out the plastic-aluminum membrane heat-seal with top 1201 in fig. 12 earlier, then with the electrical core concave position 1002 side, carry out the plastic-aluminum membrane heat-seal with the adjacent arc side in plastic-aluminum membrane casing covering piece 1001 extension edge, reserve another arc edge and carry out electrolyte for the opening as annotating the liquid mouth and pour into, then should annotate the tip of liquid mouth place again and seal the gas pocket, become, carry out evacuation secondary heat-seal in the gasbag inboard, can obtain the plastic-aluminum membrane arc lamination electrical core lithium ion battery that fig. 13 shows.
In addition, as an illustration of the present embodiment, the present embodiment may be, but is not limited to, further as shown in fig. 13: the positive plate 500 and the negative plate 1301 with different lengths are selected, the arc-shaped bending degree of the arc-shaped laminated electric core body is matched, the natural lengths of the positive plate 500 and the negative plate 1301 are changed from short to long along the arc-shaped direction of the arc-shaped laminated electric core body, so that laminated bodies which are flat at two end portions of the arc-shaped laminated electric core body and good and tidy in appearance are obtained, and the specification consistency of the laminated lithium ion battery is further improved.
As one of implementation illustrations of this step, this embodiment provides an aluminum plastic film packaging mold particularly suitable for packaging the arc-shaped lithium ion battery of this embodiment, and this mold can be used to package the arc-shaped side of the arc-shaped lithium ion battery.
Referring to fig. 15, 16, and 17, the aluminum-plastic film package mold mainly includes an upper sealing portion 1401 and a lower sealing portion 1402. The bottom of the upper seal 1401 is a first curved surface, the top of the lower seal 1402 is a second curved surface, and the first curved surface and the second curved surface can be closely fitted with each other face to face. Therefore, the arc-shaped side face of the arc-shaped lithium ion battery can be matched with the arc-shaped packaging curved surface for packaging, the packaged aluminum-plastic film can be tightly attached to the arc-shaped electric core, the aluminum-plastic film is prevented from being stretched, and the aluminum-plastic film is prevented from being deformed to cause appearance defective products.
In this embodiment, as shown in fig. 15, 16, and 17, the first curved surface of the upper seal portion 1401 may be designed as a downwardly convex curved surface, and the second curved surface of the lower seal portion 1402 may be designed as a downwardly concave curved surface. The first curved surface of the upper seal 1401 may be designed as an upward concave curved surface, and the second curved surface of the lower seal 1402 may be designed as an upward convex curved surface. Specifically, the design is made according to the arc shape of the concave position 1002 of the electric core in the encapsulated aluminum-plastic film shell.
When the aluminum plastic film is sealed, the upper sealing part 1401 and the lower sealing part 1402 are moved by a cylinder or other propulsion power device, and the upper sealing part 1401 and the lower sealing part 1402 are respectively provided with a certain temperature, and when the aluminum plastic film is sealed by the upper sealing part 1401 and the lower sealing part 1402, the upper aluminum plastic film and the lower aluminum plastic film are thermally fused together under pressure and temperature to realize sealing connection.
As one of implementation illustrations of this step, this embodiment further provides a method for encapsulating an aluminum-plastic film of an arc lithium ion battery by using the above aluminum-plastic film mold, as shown in fig. 18, where the method mainly includes:
step 1801: and loading the arc-shaped laminated electric core.
In this step, the arc-shaped laminated electrical core is placed in the electrical core concave 1002 of the aluminum-plastic film shell, and the radian of the top surface of the electrical core concave 1002 is matched with that of the arc-shaped laminated electrical core, so that the bottom surface of the arc-shaped laminated electrical core is attached to the top surface of the electrical core concave 1002 face to face.
Further details may be found in, but are not limited to, fig. 10, 11, 12 and the corresponding descriptions above.
Step 1802: covers the aluminum plastic film case cover sheet 1001.
Referring to fig. 10 and 9, the aluminum-plastic film covering sheet is covered on the top surface of the arc-shaped laminated electrical core body in an interference manner, so that the aluminum-plastic film covering sheet covers the top surface of the concave portion 1002 of the electrical core body in the interference manner.
In this embodiment, the extending connection end of the aluminum-plastic film housing covering sheet 1001 at the electrical core recess 1002 is referred to as a first arc end, and the other arc end opposite to the first arc end is referred to as a second arc end.
Step 1803: a planar heat seal process encapsulates the second arcuate end portion.
This step can be, but not limited to, using the prior art to realize a planar heat sealing process to seal the first arc-shaped end portion, i.e. the end portion opposite to the extending connection end of the aluminum-plastic film covering sheet. Namely, a first upper sealing part 1401 and a first lower sealing part 1402 which are opposite to each other in a horizontal plane are adopted to heat seal the aluminum plastic film of the second arc-shaped end part between the first upper sealing part 1401 and the first lower sealing part 1402, so that the aluminum plastic film shell covering sheet 1001 at the second arc-shaped end part and the aluminum plastic film outside the electric core concave position 1002 are sealed together in a hot melting mode.
Step 1804: the arc-shaped curved surface is used for heat sealing an arc-shaped side surface.
The curved side surface enclosed here is referred to as the first curved side surface.
The first arc-shaped side surface between the second upper sealing portion 1401 and the second lower sealing portion 1402 is heat-sealed by using a mold shown in fig. 14, 15, and 16 (the upper sealing portion 1401 is referred to as the second upper sealing portion 1401, and the lower sealing portion 1402 is referred to as the second lower sealing portion 1402), and the aluminum plastic film housing covering sheet 1001 on the first arc-shaped side surface and the aluminum plastic film outside the electric core body concave portion 1002 are heat-sealed together.
Similarly, the aluminum plastic film on the second arc-shaped side surface can be heat-sealed by adopting the method of the step 1804, so that the arc-shaped aluminum plastic film lithium ion battery is obtained.
To further facilitate understanding of the present embodiment, the following further explanation is provided in connection with the preparation process of the lithium ion battery.
After step 1804, the following is also performed:
step 1805: and (5) baking at a high temperature.
And (4) baking at high temperature according to the preparation process of the lithium ion battery in the prior art to remove moisture.
Step 1806: and (6) injecting liquid.
With the second arc side that does not carry out the plastic-aluminum membrane heat-seal at present for annotating the liquid mouth, pour into electrolyte toward electric core body concave position 1002, make the range upon range of electric core of arc fill and soak in the electrolyte.
The formation is carried out after the injection, so that the specific injection process can be, but is not limited to, see the prior art.
Step 1807: sealing the air bag.
And (3) adopting an arc side sealing process which is the same as the principle of the step 1804, and packaging the airbag at a position which is a certain distance away from the concave position 1002 of the electric core body on the right side of the second arc side surface.
Step 1808: and (4) formation.
The step enables the electrolyte to fully react, and enables the moisture in the electrolyte and the gas generated in the reaction to be discharged from the air bag so as to be pumped out in vacuum in the following step.
Step 1809: and the vacuumizing cambered surface side seals the second cambered side.
And (3) sealing a second arc-shaped side surface of the concave position 1002 of the electric core body by adopting an arc-shaped side surface which is the same as the arc-shaped side surface of the concave position 1804 and is close to the concave position 1002 of the electric core body in the air bag, and cutting off the redundant aluminum-plastic film to obtain the arc-shaped lithium ion battery finished product.
As can be seen from the above, with the technical solution of the present embodiment, after the laminated electric core 801 of the lithium ion battery is obtained, by fixing the middle of the laminated sheet, the laminated sheet is naturally placed on the top of the arc support 802 for natural molding, and then arc hot press molding and shaping are performed on the arc, and then the arc electric core concave 1002 of the aluminum-plastic film casing is assembled, and then aluminum-plastic film packaging is performed to obtain the laminated electric core.
Compared with the prior art, the following technical scheme is that: the method comprises the steps of firstly preparing a finished product of the aluminum-plastic film lithium ion battery with a flat and straight top surface and a flat bottom surface according to the prior art, then bending, pressing and shaping the flat and straight aluminum-plastic film lithium ion battery, wherein in the bending and pressing process, a pole piece and a diaphragm in the lithium ion battery limited in an aluminum-plastic film fixing space are buckled or stretched and deformed, so that the structure of the pole piece of the battery is easily damaged, the electrochemical performance of the battery is reduced, and in addition, in the bending and pressing process, the shell of the aluminum-plastic film is also buckled or stretched and deformed, so that the appearance is unqualified.
To sum up, use this embodiment technical scheme, because each pole piece, diaphragm and the plastic-aluminum membrane casing in this embodiment arc lithium ion battery all are in natural state and do not pass through deformation stretch forming, are favorable to guaranteeing lithium ion battery's electrochemical performance's stability and security, are favorable to reducing the defective rate of product.
Example 2:
referring to fig. 13, the laminated lithium ion battery of the lithium ion battery provided in this embodiment includes: arc-shaped laminated electric core bodies and aluminum-plastic film shells. The structure and the connection relation of each part are as follows:
referring to fig. 14, the arc-shaped laminated electrical core body is composed of a negative plate 1301 and a positive plate 500 which are laminated and naturally formed into an arc shape, a naturally formed arc-shaped diaphragm layer is arranged between any one of the positive plate 500 and the negative plate 1301, and each diaphragm layer is bonded with the positive plate 500 and the negative plate 1301 which are adjacent to the diaphragm layer. Specific preparation processes can be, but are not limited to, those described in example 1.
Referring to fig. 10 or 9, an electrical core concave 1002 is formed on the aluminum-plastic film casing, and the arc-shaped laminated electrical core is limited in the electrical core concave 1002 and sealed by the aluminum-plastic film casing. Specific preparation processes can be, but are not limited to, those described in example 1.
Therefore, by applying the technical scheme of the embodiment, the pole pieces, the diaphragm and the aluminum-plastic film shell of the laminated electric core 801 of the lithium ion battery obtained by the embodiment are all in a natural state and are not subjected to deformation, stretching and molding.
Compared with the prior art, the following technical scheme is that: the method comprises the steps of firstly preparing a finished product of the aluminum-plastic film lithium ion battery with a flat and straight top surface and a flat bottom surface according to the prior art, then bending, pressing and shaping the flat and straight aluminum-plastic film lithium ion battery, wherein in the bending and pressing process, a pole piece and a diaphragm in the lithium ion battery limited in an aluminum-plastic film fixing space are buckled or stretched and deformed, so that the structure of the pole piece of the battery is easily damaged, the electrochemical performance of the battery is reduced, and in addition, in the bending and pressing process, the shell of the aluminum-plastic film is also buckled or stretched and deformed, so that the appearance is unqualified. Therefore, the technical scheme of the embodiment is favorable for ensuring the stability and the safety of the electrochemical performance of the lithium ion battery and reducing the reject ratio of products.
As a schematic one of this embodiment, referring to fig. 5, in the arc-shaped laminated battery core of this embodiment, each positive electrode sheet 500 may be respectively assembled in each separator bag, and each separator bag includes: a first diaphragm and a second diaphragm. Wherein the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of each positive plate 500; at least two discontinuous heat-seal seals are respectively formed on at least two longitudinal edges of the first diaphragm and the second diaphragm, and the first diaphragm and the second diaphragm are in hot-melt connection at each heat-seal. Further specific preparation processes and advantageous effects can be seen, but are not limited to, the corresponding descriptions in example 1.
Optionally, in the arc-shaped laminated electrical core body of the embodiment, in each positive plate separator bag, each discontinuous spaced heat-seal is respectively disposed on the peripheral edges of the first separator and the second separator. Further specific preparation processes and advantageous effects can be seen, but are not limited to, the corresponding descriptions in example 1.
As a second schematic diagram of the present embodiment, referring to fig. 6, in the arc-shaped laminated battery core of the present embodiment, each positive electrode sheet 500 may be respectively assembled in each separator bag, and each separator bag includes: a first diaphragm and a second diaphragm. Wherein the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of each positive plate 500; and respectively forming heat-seal seals on at least one width end part of the first diaphragm and the second diaphragm, wherein the first diaphragm and the second diaphragm are in hot-melt connection at the heat-seal seals.
Alternatively, in the arc-shaped laminated cell body of the present embodiment, the heat seal formed at the end of the width may be a non-continuous heat seal at intervals, or may be a continuous heat seal.
Alternatively, in the arc-shaped laminated cell body of the present embodiment, the heat-seal seals described above may be provided on the first separator, the second separator, and the first width end portion of the positive electrode sheet 500 from which the tab welding portion 5001 extends, the heat-seal described above may be provided on the second width end portion of the positive electrode sheet 500 opposite to the tab welding portion 5001, and the heat-seal seals described above may be provided on both ends. Further specific preparation processes and advantageous effects can be seen, but are not limited to, the corresponding descriptions in example 1.
Referring to fig. 7 as a third schematic diagram of the present embodiment, in the arc-shaped laminated battery core of the present embodiment, each positive electrode sheet 500 may be respectively assembled in each separator bag, and each separator bag includes: a first diaphragm and a second diaphragm. Wherein the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of each positive plate 500; and heat-seal seals are respectively formed on at least any two of the four top corners of the first diaphragm and the second diaphragm, and the first diaphragm and the second diaphragm are in hot-melt connection at the heat-seal seals.
Optionally, in the arc-shaped laminated electrical core body of the embodiment, heat sealing may be performed only at any two vertex angles, any three vertex angles, or four vertex angles of the first vertex angle, the second vertex angle, the third vertex angle, and the fourth vertex angle of the first diaphragm and the second diaphragm, which is found by the inventor in the research process of the present invention that, when heat sealing is performed only at two vertex angles, a process of heat sealing at diagonal vertex angles is adopted to facilitate better positioning of the positive plate 500; and the four vertex angles are adopted for heat sealing, so that the positive plate 500 can be completely positioned, and the displacement in any direction is avoided. Further specific preparation processes and advantageous effects can be seen, but are not limited to, the corresponding descriptions in example 1.
Example 3:
the laminated lithium ion battery provided in this embodiment is different from embodiment 2 only in that, in this embodiment, the positive plate 500 and the negative plate 1301 with different lengths are selected, so that the arc camber of the arc-shaped laminated core body is matched, and the natural lengths of the positive plate 500 and the negative plate 1301 are changed from short to long along the arc-shaped direction of the arc-shaped laminated core body, so as to obtain a laminated body with flat two end portions of the arc-shaped laminated core body and good and tidy appearance, which is further beneficial to improving the specification consistency of the laminated lithium ion battery.
Test comparison analysis:
to further illustrate the technical effects of the present embodiment, the following description is made by comparing the same model specification with the comparative document test analysis of the embodiment of the present invention:
comparative example: the method comprises the following steps of directly bending and pressing aluminum plastic film lithium ion batteries on upper and lower planes by using the prior art to obtain an arc-shaped lithium ion battery;
example 1: by adopting the embodiment 1, the arc-shaped laminated electric core body formed by natural non-deformation is obtained, and the arc-shaped laminated electric core body is assembled in the concave position of the arc-shaped electric core body to be packaged by the aluminum plastic film, so that the arc-shaped lithium ion battery is obtained, wherein the pole piece bag adopts a first preparation scheme of a positive pole piece diaphragm bag;
example 2: by adopting the embodiment 1, the arc-shaped laminated electric core body formed by natural non-deformation is obtained, and the arc-shaped laminated electric core body is assembled in the concave position of the arc-shaped electric core body to be packaged by the aluminum plastic film, so that the arc-shaped lithium ion battery is obtained, wherein the pole piece bag adopts a second preparation scheme of a positive pole piece diaphragm bag;
example 3: by adopting the embodiment 1, the arc-shaped laminated electric core body formed by natural non-deformation is obtained, and the arc-shaped laminated electric core body is assembled in the concave position of the arc-shaped electric core body to be packaged by the aluminum plastic film, so that the arc-shaped lithium ion battery is obtained, wherein the pole piece bag adopts a third preparation scheme of a positive pole piece diaphragm bag;
the electrochemical performance of the lithium ion battery was tested on 1000 battery samples, respectively, to obtain the data shown in table one:
table one: data result comparison table for electrical property experiment
Therefore, the technical scheme of the embodiment is favorable for reducing the appearance reject ratio of the product and improving the electrochemical performance of the product.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (9)
1. A positive plate diaphragm bag is characterized by comprising: a first diaphragm, a second diaphragm and a positive plate,
the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of the positive plate;
and respectively forming heat-seal seals on at least one width end part of the first diaphragm and the second diaphragm, wherein the first diaphragm and the second diaphragm are in hot-melt connection at the heat-seal seals.
2. The positive plate separator bag according to claim 1,
at least two of the seals are formed on the width ends that are not continuous with each other.
3. The positive plate separator bag according to claim 1,
forming a continuous said heat seal over said widthwise ends.
4. A positive plate separator bag according to claim 1, 2 or 3,
and forming the heat-seal on the first diaphragm, the second diaphragm and the first width end part where the tab welding part of the positive plate extends out.
5. A positive plate separator bag according to claim 1, 2 or 3,
and forming the heat-seal on the second width end parts of the first diaphragm and the second diaphragm, which are opposite to the tab welding part of the positive plate.
6. A positive plate separator bag according to claim 1, 2 or 3,
and forming the heat-seal seals on the two width end parts of the first diaphragm and the second diaphragm.
7. A laminated lithium ion battery is characterized by comprising a negative plate and a positive plate diaphragm bag which are mutually laminated,
the positive plate diaphragm bag includes: a first diaphragm, a second diaphragm and a positive plate,
the first diaphragm and the second diaphragm are respectively opposite to the top and the bottom of the positive plate;
respectively forming heat-seal seals on at least one width end part of the first diaphragm and the second diaphragm, wherein the first diaphragm and the second diaphragm are in hot-melt connection at the heat-seal seals;
and a naturally formed arc-shaped diaphragm layer is respectively arranged between any positive plate and any negative plate at intervals.
8. The laminated lithium ion battery of claim 7,
forming at least two of said seals on said widthwise ends that are not continuous with one another; or,
forming a continuous said heat seal over said widthwise ends.
9. The laminated lithium-ion battery according to claim 7 or 8,
forming the heat-seal on the first diaphragm, the second diaphragm and the first width end part where the tab welding part of the positive plate extends out; or;
forming the heat-seal on the first diaphragm and the second diaphragm and on the second width end part opposite to the tab welding part of the positive plate; or,
and forming the heat-seal seals on the two width end parts of the first diaphragm and the second diaphragm.
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| CN2013203086363U CN203351680U (en) | 2013-05-31 | 2013-05-31 | Positive plate diaphragm bag and laminated lithium ion battery with positive plate diaphragm bag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633451A (en) * | 2015-12-29 | 2016-06-01 | 深圳市优特利电源有限公司 | Ultra-thin polymer battery and fabrication method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633451A (en) * | 2015-12-29 | 2016-06-01 | 深圳市优特利电源有限公司 | Ultra-thin polymer battery and fabrication method thereof |
| CN105633451B (en) * | 2015-12-29 | 2018-06-05 | 深圳市优特利电源有限公司 | Ultrathin polymer battery and production method |
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