CN203288671U - Positive plate diaphragm bag and laminated lithium ion battery with same - Google Patents
Positive plate diaphragm bag and laminated lithium ion battery with same Download PDFInfo
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- CN203288671U CN203288671U CN2013203085905U CN201320308590U CN203288671U CN 203288671 U CN203288671 U CN 203288671U CN 2013203085905 U CN2013203085905 U CN 2013203085905U CN 201320308590 U CN201320308590 U CN 201320308590U CN 203288671 U CN203288671 U CN 203288671U
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- barrier film
- positive plate
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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
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 same. The positive plate diaphragm bag comprises a first diaphragm, a second diaphragm and a positive plate, wherein the first diaphragm and the second diaphragm are disposed on the top of the positive plate and the bottom of the positive plate oppositely; at least any two longitudinal edges of the first diaphragm and the second diaphragm are provided with at least two heat sealing seals which are not continuous; and the first diaphragm and the second diaphragm are in hot-melt connection at the heat sealing seals. Application of the technical solution is beneficial to improve the appearance and the electrochemical properties of a battery.
Description
Technical field
The utility model relates to the lithium ion battery field, particularly a kind of positive plate diaphragm bag and with the laminated lithium ion battery of this positive plate diaphragm bag.
Background technology
Because lithium ion battery has high-energy-density, high output voltage, the advantage such as high-output power and being widely used.Present lithium ion battery is mainly cylinder, and is square, the shapes such as button, but along with the application of lithium ion battery constantly expands to every field, the lithium ion battery of other shapes also more and more receives publicity, and, such as the battery that is applied on pedometer, just needs a kind of lithium ion battery of bending.
In carrying out the utility model research process, the inventor finds prior art, and there are the following problems at least:
The lithium ion battery of rare bending in the market is to make its bending with tool after battery completes, and has damaged to a great extent pole piece and the structure of battery, has reduced the chemical property of battery, also has potential safety hazard; In addition, make battery surface produce fold in the process of crooked battery, outward appearance is ugly.
The utility model content
One of the utility model embodiment purpose is to provide the positive plate diaphragm bag and, with the laminated lithium ion battery of this positive plate diaphragm bag, applies this technical scheme and be conducive to improve the battery outward appearance and improve electro-chemical properties.
A kind of positive plate diaphragm bag that the utility model embodiment provides, is characterized in that, comprising: the first barrier film, the second barrier film, positive plate,
Described the first barrier film, the second barrier film are respectively over against the top that is positioned at described positive plate, bottom;
Form respectively not consecutive at least two heat-sealing sealings at least two longitudinal edges of described the first barrier film, the second barrier film, described the first barrier film, the second barrier film connect at each described heat-sealing sealing part hot melt.
Alternatively, form respectively described heat-sealing sealing on the edge of described the first barrier film, the second barrier film.
A kind of laminated lithium ion battery that the present embodiment provides, comprise stacked negative plate, positive plate diaphragm bag mutually,
Described positive plate diaphragm bag comprises: the first barrier film, the second barrier film, positive plate,
Described the first barrier film, the second barrier film are respectively over against the top that is positioned at described positive plate, bottom;
Form respectively not consecutive at least two heat-sealing sealings at least two longitudinal edges of described the first barrier film, the second barrier film, described the first barrier film, the second barrier film connect at each described heat-sealing sealing part hot melt;
Be separated with a curved membrane layer of natural moulding between respectively between arbitrary described positive plate, negative plate.
Alternatively, form respectively described heat-sealing sealing on the edge of described the first barrier film, the second barrier film.
Therefore, application the present embodiment technical scheme, with respect to prior art, adopt the positive plate of this programme to enter a bag technique, on the one hand, realized the location to the positive plate in diaphragm bag, avoided positive plate displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme one owing in the diaphragm bag encapsulation, adopting the heat-sealing of discontinuous interval, make the opening that is formed with external connection in the surrounding of diaphragm bag, like this when fluid injection, liquid can immerse positive plate by diaphragm bag better, is conducive to improve capacity and the electrical property of laminated lithium ion battery with respect to prior art.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, does not form to improper restriction of the present utility model, in the accompanying drawings:
Preparation technology's schematic flow sheet of the laminated lithium ion battery that Fig. 1 provides for the utility model embodiment 1;
The positive plate diaphragm bag that Fig. 2 provides for the utility model embodiment 1 prepares scheme one flow process schematic diagram;
The positive plate diaphragm bag that Fig. 3 provides for the utility model embodiment 1 prepares scheme two flow process schematic diagrames;
The positive plate diaphragm bag that Fig. 4 provides for the utility model embodiment 1 prepares scheme three schematic flow sheets;
The positive plate diaphragm bag that Fig. 5 provides for the utility model embodiment 1 prepares the positive plate diaphragm bag structural representation that scheme one flow process makes;
The positive plate diaphragm bag that Fig. 6 provides for the utility model embodiment 1 prepares the positive plate diaphragm bag structural representation that scheme two flow processs make;
The positive plate diaphragm bag that Fig. 7 provides for the utility model embodiment 1 prepares the positive plate diaphragm bag structural representation that scheme three flow processs make;
Fig. 8 is held on structural representation for the body formed device of lithium ion laminated for the utility model embodiment 1,2 provides naturally with stacked battery core body;
Fig. 9 provides the another kind of structural representation that is used for the body formed device of lithium ion laminated for the utility model embodiment 1;
A kind of aluminum plastic film shell structure schematic diagram that Figure 10 provides for the utility model embodiment 1;
The another kind of aluminum plastic film shell structure schematic diagram that Figure 11 provides for the utility model embodiment 1;
Aluminum plastic film laminated lithium ion battery (limit, the liquid injection port place does not seal) structural representation of the arc that Figure 12 provides for the utility model embodiment 1,2;
The aluminum plastic film arc laminated lithium ion battery structural representation that Figure 13 provides for the utility model embodiment 1,2;
The stacked battery core body structure of the arc that provides in the utility model embodiment 1,2 schematic diagram is provided Figure 14;
The main TV structure schematic diagram of the aluminum plastic film buckling of shells side seal mould that provides in the utility model embodiment 1,2 is provided Figure 15;
The side structure schematic diagram of the aluminum plastic film buckling of shells side seal mould that provides in Figure 16 the utility model embodiment 1,2;
The schematic top plan view of the aluminum plastic film buckling of shells side seal mould that provides in Figure 17 utility model embodiment 1,2;
The flowage structure schematic diagram of the aluminum plastic film housing plastic packaging that provides in Figure 18 utility model embodiment 1,2.
Reference numeral:
500: positive plate; 501: the first longitudinal edges; 502: the second longitudinal edges;
601: the first widthwise edges; 602: the second widthwise edges; 5001: tab welding section;
801: stacked battery core body; 802: arc support; 803: the arc compacting tool set;
902: arc support; 903: the arc compacting tool set; 1001: aluminum plastic film housing emulsion sheet;
1002: battery core body recess; 1102: battery core body recess; 1301: negative plate;
1201: top; 1401: the upper envelope section of heat seal die;
1402: the second lower seal section of heat seal die.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, in this illustrative examples of the present utility model and explanation, be used for explaining the utility model, but not as to restriction of the present utility model.
Embodiment 1:
Shown in Fig. 1-18, the present embodiment provides a kind of preparation technology of laminated lithium ion battery, and this technique mainly comprises the following steps:
Step 101: lamination obtains the lamination body.
In this step, stacked negative plate 1301, positive plate 500 obtain stacked battery core body 801.Be separated with a membrane layer between respectively between the interior arbitrary layer of positive plate 500 of stacked battery core body 801 that this obtains, negative plate 1301.
In this step can be according to adopting monolithic positive plate 500, diaphragm, negative plate 1301 lamination process to realize in existing techniques in realizing.
As the enforcement signal of this step, the inventor provides following lamination techniques scheme:
Wherein the manufacturing of positive plate diaphragm bag can be according to existing techniques in realizing, and the positive plate 500 of namely packing in three diaphragm bags that all seal, make the tab welding section 5001 of positive plate 500 stretch out from the width end of positive plate diaphragm bag.
As the enforcement signal of this step, the technology of preparing scheme of the positive plate diaphragm bag below the inventor also provides:
The positive plate diaphragm bag prepares scheme one:, according to be lowered to bag technique with each positive plate 500 each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, shown in Fig. 2,5, enter bag technique as follows:
Step 201: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate 500.
The active component applying area that makes this positive plate 500 is by the first barrier film, the second barrier film up and down over against covering, and tab welding section 5001 stretches out from the first width end of the first barrier film, the second barrier film.
Step 202: at least two longitudinal edges of heat-sealing the first barrier film, the second barrier film form respectively a plurality of not consecutive heat-sealing sealings on two longitudinal edges.
The first barrier film, the second barrier film connect at each heat-sealing sealing part hot melt, obtain the positive plate diaphragm bag.
In this step, can be only at the first longitudinal edge 501 of the first barrier film, the second barrier film, the hot-seal that the second enterprising between-line spacing heat-sealing of longitudinal edge 502 formation is not connected;
In this step, also can carry out respectively the interval heat-sealing on the first longitudinal edge 501 of the first barrier film, the second barrier film, the second longitudinal edge 502, the first widthwise edges 601 and form the hot-seal that is not connected;
In this step, can also all carry out the interval heat-sealing on the first longitudinal edge 501 of the first barrier film, the second barrier film, the second longitudinal edge 502, the first widthwise edges 601, the second widthwise edges 602 and form the hot-seal that is not connected.
With respect to prior art, positive plate 500 shown in employing scheme one enters a bag technique, on the one hand, realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme one owing in the diaphragm bag encapsulation, adopting the heat-sealing of discontinuous interval, make the opening that is formed with external connection in the surrounding of diaphragm bag, like this when fluid injection, liquid can immerse positive plate 500 by diaphragm bag better, is conducive to improve capacity and the electrical property of laminated lithium ion battery with respect to prior art.
The positive plate diaphragm bag prepares scheme two:, according to be lowered to bag technique with each positive plate 500 each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, shown in Fig. 3,6, enter bag technique as follows:
Step 301: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate 500.
The active component applying area that makes this positive plate 500 is by the first barrier film, the second barrier film up and down over against covering, and tab welding section 5001 stretches out from the first width end of the first barrier film, the second barrier film.
Step 302: at least one width end of heat-sealing the first barrier film, the second barrier film.
In this step, at least one width end of heat-sealing the first barrier film, the second barrier film, be formed with the heat-sealing sealing on the width end that is heat-sealed, and the first barrier film, the second barrier film connect at heat-sealing sealing part hot melt, obtain the positive plate diaphragm bag.
In this step, can adopt the technical scheme of above-mentioned discontinuous interval heat-sealing, also can adopt the technical scheme of continuous heat-sealing.
In this step, the the first width end that can only in the tab welding position of the first barrier film, the second barrier film, stretch out seals, can also but be not limited to seal in the second width end in opposite end, tab welding position only, can also but be not limited to all seal in two width ends.
With respect to prior art, adopt this positive plate diaphragm bag to prepare the positive plate 500 shown in scheme two and enter a bag technique, on the one hand, realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme two and seals due to the arbitrary or two width ends of the two width ends that are encapsulated in barrier film at diaphragm bag, at least two longitudinal edges at diaphragm bag all externally are communicated with, like this when fluid injection, liquid can immerse positive plate 500 by diaphragm bag better, with respect to prior art, is conducive to improve capacity and the electrical property of lithium ion battery greatly.
The positive plate diaphragm bag prepares scheme three:, according to be lowered to bag technique with each positive plate 500 each diaphragm bag of packing into, obtain each described positive plate diaphragm bag respectively, shown in Fig. 4,7, enter bag technique as follows:
Step 401: the first barrier film, the second barrier film are placed respectively in end face, bottom surface at every positive plate 500.
The active component applying area that makes this positive plate 500 is by the first barrier film, the second barrier film up and down over against covering, and tab welding section 5001 stretches out from the first width end of the first barrier film, the second barrier film.
Step 402: any at least two of four drift angles of heat heat-sealing the first barrier film, the second barrier film form the heat-sealing sealing.
In this step, the first barrier film, the second barrier film connect at heat-sealing sealing part hot melt, obtain the positive plate diaphragm bag.
In this step, can be only at the first drift angle, the second drift angle, the 3rd drift angle, any two drift angles of the 4th drift angle, wantonly three drift angles or four drift angles of the first barrier film, the second barrier film, seal, the inventor finds in carrying out the utility model research process, only when two drift angle heat-sealings, adopt the technique of diagonal angle drift angle heat-sealing to be conducive to better positive plate 500 be positioned; Adopt four drift angle heat-sealings, can realize the location fully to positive plate 500, avoid the displacement of either direction.
With respect to prior art, adopt this positive plate diaphragm bag to prepare the positive plate 500 shown in scheme two and enter a bag technique, on the one hand, realized the location to the positive plate 500 in diaphragm bag, avoided positive plate 500 displacement and cause the not good even short circuit of lithium ion battery electrical property, cause the problem of potential safety hazard; On the other hand, this positive plate diaphragm bag prepares scheme two and seals due at least two of four drift angles that are encapsulated in barrier film at diaphragm bag, make at four edges of diaphragm bag and all externally be communicated with, like this when fluid injection, liquid can immerse positive plate 500 by diaphragm bag better, with respect to prior art, is conducive to improve capacity and the electrical property of lithium ion battery greatly.
Step 102: fixing stacked battery core body 801 middle parts.
After step 101 obtains stacked battery core body 801, can but be not limited to the middle part of the fixing stacked battery core body 801 of the mode of by gummed paper, pasting, make the both ends of stacked battery core body 801 can naturally droop or naturally scroll up under the effect of receiving other upward forces.
Step 103: the stacked battery core body 801 of arc hot pressing.
Shown in Figure 8, the stacked battery core body 801 that middle part is fixing is held on the top for the arc support 802 of the body formed device of lithium ion laminated naturally, stacked battery core body 801, due to the effect of gravity, naturally is close to the top that covers arc support 802 and is formed the arc identical with the top arc.
Start the arc compacting tool set 803 that is positioned at arc support 802 tops, make this arc compacting tool set 803 possess predetermined temperature, with predetermined pressure, the lamination body that is positioned at arc support 802 tops be suppressed,
The bottom of arc compacting tool set 803 is formed with the second arc that is complementary with arc support 802 top arcs, when arc compacting tool set 803 covers arc support 802 top, can contact with arc support 802 top surface opposites.When stacked battery core body 801 is suppressed, arc compacting tool set 803 contacts face-to-face with the stacked battery core body 801 that is positioned at arc support 802 tops, evenly give stacked battery core body 801 certain pressure and the temperature in surface, under the effect of hot pressing, in stacked battery core body 801 each membrane layer respectively positive plate 500, the negative plate 1301 adjacent with this membrane layer mutually be bonded together, namely whole stacked battery core body 801 bonds in aggregates mutually by the bonding of each membrane layer.
In the present embodiment can be at membrane layer or positive plate 500 or material that negative plate 1301 surface-coated are various to bond can be at high temperature the time mutually and realize the positive plate 500 that membrane layer is adjacent, the bonding of negative plate 1301.
as one of signal of the present embodiment, the inventor provides at the end face of each membrane layer of each diaphragm bag and bottom surface and has applied respectively polyvinylidene fluoride material (Polyvinylidene Fluoride, be called for short PVDF), make at each membrane layer end face and bottom surface and all be formed with the PVDF layer, when carrying out hot pressing, make hot pressing temperature reach predetermined temperature, make under the pressure and temperature of arc compacting tool set 803, each PVDF layer of each membrane layer is being heated lower softening (softening temperature is 112～145 ℃) thereby the positive plate that is adjacent 500, negative plate 1301 is bonded together mutually realizes that each membrane layer is in each positive plate 500, the mutual bonding of negative plate 1301.
In this step, what both can make arc compacting tool set 803, arc support 802 when hot pressing arbitraryly possesses certain temperature, also can make above-mentioned both all possess certain temperature,, to improve the hot pressing effect, reduces hot pressing time.
Need to prove, the structure that is used for the body formed device of lithium ion laminated of this enforcement can be arranged to the top of arc support 802 arc to upper process as shown in Figure 8, also can the top with arc support 902 as shown in Figure 9 be arranged to the first arc to bottom notch, when the lamination body is placed on the first arc, form the arc that raises up under the carrying of the first arc.The bottom of arc compacting tool set 903 is arranged to mutually mate with the first arc, to the second arc of bottom protrusion, realize the face-to-face compacting to the lamination body.
Step 104: the standing typing of stacked battery core body 801 obtains the stacked battery core body of arc.
To certain hour, stop hot pressing in hot pressing, make stacked battery core body 801 at the top of arc support 802 standing certain duration, make the typing of its arc obtain the stacked battery core body of arc.
In the standing process of stacked battery core body 801, can normal temperature standing, also can be cooling standing; Can make arc compacting tool set 803 apply the effect of certain force to stacked battery core body 801 when standing, also can not apply and make this stacked battery core body 801 naturally be affixed on the top typing moulding of arc support 802 due to the effect of gravity own.
Step 105: aluminum plastic film enters the shell encapsulation.
This enforcement also provides a kind of aluminum plastic film housing, referring to Figure 10, shows, the aluminum plastic film housing of the present embodiment includes the battery core body recess 1002 of aluminum plastic film housing emulsion sheet 1001, relative aluminum plastic film housing emulsion sheet 1001 low levels.The end face of battery core body recess 1002 is circular-arc, aluminum plastic film housing emulsion sheet 1001 extends in the top of battery core body recess 1002, so that after arc laminated battery core body is assemblied in battery core body recess 1002, aluminum plastic film housing emulsion sheet 1001 is covered with battery core body recess 1002 end faces its nature under the Action of Gravity Field of aluminum plastic film housing emulsion sheet 1001 is close to the end face of arc battery core body in it, then carry out the aluminum plastic film heat-sealing and realize encapsulation, obtain the aluminum plastic film arc battery of the curved shape of nature.
In this step, the end face of the battery core body recess 1002 of the present embodiment aluminum plastic film housing can be designed to the arc of upwards bottom notch as shown in figure 10, also can the end face with battery core body recess 1102 as shown in figure 11 be designed to the arc to top bump.
In the present embodiment, because the battery core body recess 1002 of aluminum plastic film housing is arc, therefore after aluminum plastic film housing emulsion sheet 1001 is covered battery core body recess 1002 tops, while carrying out the plastic packaging at the battery core body recess 1002 arbitrary edges of surrounding, all coordinate the arc of this battery core body recess 1002 to adopt the plastic package die of arc shape to carry out plastic packaging, make the aluminum plastic film laminated lithium ion battery that obtains arc shown in Figure 12.
A kind of signal as the present embodiment: when carrying out the heat-sealing of aluminum plastic film housing, can first the top 1201 in Figure 12 be carried out the aluminum plastic film heat-sealing, then battery core body recess 1002 sides, an arc-shaped side edges adjacent with aluminum plastic film housing emulsion sheet 1001 extending edges are carried out the aluminum plastic film heat-sealing, another curved edge is reserved as opening as liquid injection port, carries out electrolyte filling, then carry out again this end, liquid injection port place envelope gasbag, change into, in the gasbag inboard, vacuumize the secondary heat-sealing, can obtain aluminum plastic film arc laminated battery core body lithium ion battery shown in Figure 13.
In addition, signal as the present embodiment, in the present embodiment can but be not limited to as shown in figure 13 further: select the different positive plate of length 500, negative plate 1301, make the arc camber that coordinates arc laminated battery core body, along the arc of the stacked battery core body of arc direction from inside to outside, the natural length of positive plate 500, negative plate 1301 changes from short to long, thereby obtain, profile good neat lamination body equal at the stacked battery core body of arc both ends, further be conducive to improve the specification consistency of laminated lithium ion battery.
As one of the enforcement of this step signal, the present embodiment provides a kind of aluminum plastic film encapsulating mould that is specially adapted to the encapsulation of the present embodiment arc lithium ion battery, and this mould can be used for encapsulating the arc-shaped side edges of arc lithium ion battery.
Referring to Figure 15, Figure 16, shown in Figure 17, this aluminum plastic film encapsulating mould mainly comprises envelope section 1401, lower seal section 1402.The bottom of upper envelope section 1401 is first surface, and the top of lower seal section 1402 is respectively the second curved surface, first surface, the second curved surface can be mutually snug fit face-to-face.Thereby when encapsulating, the arcuate flanks to the arc lithium ion battery can coordinate the encapsulation curved surface of this arc to encapsulate, the aluminum plastic film that had both guaranteed encapsulation can be close to arc battery core body, avoid again the stretching to aluminum plastic film, avoided aluminum plastic film generation deformation to cause the generation of bad order product.
In the present embodiment, can be designed to the cambered surface to lower convexity as Figure 15, Figure 16, the first surface with upper envelope section 1401 shown in Figure 17, the second curved design of lower seal section 1402 is become cambered surface recessed down.The first surface of upper envelope section 1401 can also be designed to recessed facing up cambered surface, the cambered surface that the second curved design of lower seal section 1402 is become to raise up.Specifically according to the arc of the battery core body recess 1002 in packed aluminum plastic film housing, design.
When carrying out the aluminum plastic film encapsulation, can move the arbitrary of upper envelope section 1401, lower seal section 1402 or both by cylinder or other power plant, and make the arbitrary of envelope section 1401, lower seal section 1402 or both possess respectively certain temperature, in upper envelope section 1401, when 1402 pairs of aluminum plastic films of lower seal section carry out plastic packaging, at pressure and temperature, the aluminum plastic film hot melt of levels combines and realizes being tightly connected.
As one of the enforcement of this step signal, the present embodiment also provides a kind of method of above-mentioned aluminum plastic film mould to the aluminum plastic film encapsulation of arc lithium ion battery of utilizing, and shown in Figure 18, the method mainly comprises:
Step 1801: the stacked battery core body of the arc of packing into.
In this step, the stacked battery core body of arc is placed in the battery core body recess 1002 of described aluminum plastic film housing, the radian of the radian of the end face of this battery core body recess 1002 and the stacked battery core body of arc is complementary, and the bottom surface of the stacked battery core body of arc and the end face of described battery core body recess 1002 are fitted face-to-face.
Be described in further detail can but be not limited to referring to Figure 10, Figure 11, Figure 12 and corresponding description above.
Step 1802: aluminium coating plastic film housing emulsion sheet 1001.
Shown in Figure 10,9, the interference of plastic-aluminum putamina emulsion sheet is covered the end face of the stacked battery core body of arc, make this plastic-aluminum putamina emulsion sheet interference cover battery core body recess 1002 end faces.
The present embodiment is designated as the first curved end with aluminum plastic film housing emulsion sheet 1001 in the extension connection end of battery core body recess 1002, and another curved end that will be relative with the first curved end is designated as the second curved end.
Step 1803: plane hot sealing process encapsulation the second curved end.
This step can but be not limited to adopt existing techniques in realizing plane hot sealing process encapsulation the first curved end, namely in plastic-aluminum putamina emulsion sheet, extend the relative end of link.Namely adopt the horizontal plane opposite relative first on envelope section 1401, the heat-sealing of the first lower seal section 1402 at the aluminum plastic film of the second curved end between envelope section 1401, the first lower seal section 1402 on described first, the outer aluminum plastic film hot-melting sealed of the described aluminum plastic film housing emulsion sheet 1001 that makes the second curved end place and described battery core body recess 1002 is together.
Step 1804: arc-shaped curved surface heat-sealing one arcuate flanks.
This is in packed arcuate flanks is designated as the first arcuate flanks.
Adopt Figure 14, Figure 15, mould shown in Figure 16 (upper envelope section 1401 to be designated as envelope section 1401 on second, lower seal section 1402 is designated as the second lower seal section 1402) heat-sealing is in the first arcuate flanks between envelope section 1401, the second lower seal section 1402 on second, and the outer aluminum plastic film hot-melting sealed of the aluminum plastic film housing emulsion sheet 1001 that makes the first arcuate flanks place and battery core body recess 1002 is together.
In like manner, adopt the method for step 1804 can realize the aluminum plastic film of the second arcuate flanks is sealed, obtain the arc lithium-ion battery with aluminium plastic film.
, in order to further facilitate the understanding of people to the present embodiment, below in conjunction with the preparation technology of lithium ion battery, further explain.
After step 1804, below also carrying out:
Step 1805: high-temperature baking.
Lithium ion battery preparation technology according to prior art carries out high-temperature baking, removes moisture.
Step 1806: fluid injection.
, take current the second arcuate flanks of not carrying out the aluminum plastic film heat-sealing as liquid injection port,, toward the interior perfusion electrolyte of battery core body recess 1002, the stacked battery core body of arc is filled be immersed in described electrolyte.
Change into after fluid injection, make concrete liquid injection process can but be not limited to referring to prior art.
Step 1807: envelope gasbag.
Adopt the cambered surface side seal technique identical with the principle of step 1804, at the rightmargin of the second arcuate flanks, carry out the gasbag encapsulation with a certain distance from the position of battery core body recess 1002.
Step 1808: change into.
This step is fully reacted electrolyte, make wherein moisture and reaction in the gas that produces discharge at gasbag, in order to follow-uply by vacuum, extracted out.
Step 1809: vacuumize cambered surface side seal the second arcuate flanks.
, near outside battery core body recess 1002, adopt the second arcuate flanks of the cambered surface side seal battery core body recess 1002 identical with the principle of step 1804 in gasbag, wipe out unnecessary aluminum plastic film and namely obtain arc lithium ion battery finished product this moment.
Therefore, application the present embodiment technical scheme, due to the present embodiment after obtaining the stacked battery core body 801 of lithium ion battery, by lamination body middle part is fixing, carry out the hot-forming typing of arc after allowing the lamination body naturally be held on the top nature moulding of arc support 802 on this arc, then fit into the arc battery core body recess 1002 of aluminum plastic film housing, then carry out the aluminum plastic film encapsulation and obtain.
following technical scheme with respect to prior art: first according to prior art, prepare after end face and bottom surface be the lithium-ion battery with aluminium plastic film finished product of flat, lithium-ion battery with aluminium plastic film to this flat carries out crooked pressed sizing, in crooked pressing process, be limited in pole piece and barrier film generation fold or tensile deformation in the lithium ion battery in the aluminum plastic film fixed space, the structural damage that easily causes battery pole piece, reduce the chemical property of battery, and, the deformation that fold also occurs or be stretched everywhere of aluminum plastic film housing in crooked pressing process, cause the generation of bad order product.
To sum up, application the present embodiment technical scheme, due to each pole piece in the present embodiment arc lithium ion battery, barrier film and aluminum plastic film housing all in the raw and not by the deformation drawing and forming, be conducive to guarantee stability and the fail safe of the chemical property of lithium ion battery, be conducive to reduce the fraction defective of product.
Embodiment 2:
Shown in Figure 13, the laminated lithium ion battery of the lithium ion battery that the present embodiment provides, it comprises: the stacked battery core body of arc and aluminum plastic film housing.Wherein the structure of each several part and annexation are as follows:
The structure of the stacked battery core body of arc is shown in Figure 14, the stacked battery core body of arc consists of the curved negative plate 1301 of stacked natural moulding, positive plate 500, be separated with a curved membrane layer of natural moulding between respectively between arbitrary positive plate 500, negative plate 1301, each membrane layer described positive plate 500, negative plate 1301 adjacent with this membrane layer respectively bonds mutually.Concrete preparation technology can but be not limited to referring to the corresponding introduction in embodiment 1.
The structure of aluminum plastic film housing, referring to shown in Figure 10 or 9, is formed with battery core body recess 1002 on the aluminum plastic film housing, the stacked battery core body of arc is spacing in battery core body recess 1002, by the aluminum plastic film housing seal.Concrete preparation technology can but be not limited to referring to the corresponding introduction in embodiment 1.
Therefore application the present embodiment technical scheme, because the present embodiment is obtaining stacked battery core body 801 each pole pieces of lithium ion battery, barrier film and aluminum plastic film housing all in the raw and not by the deformation drawing and forming.
following technical scheme with respect to prior art: first according to prior art, prepare after end face and bottom surface be the lithium-ion battery with aluminium plastic film finished product of flat, lithium-ion battery with aluminium plastic film to this flat carries out crooked pressed sizing, in crooked pressing process, be limited in pole piece and barrier film generation fold or tensile deformation in the lithium ion battery in the aluminum plastic film fixed space, the structural damage that easily causes battery pole piece, reduce the chemical property of battery, and, the deformation that fold also occurs or be stretched everywhere of aluminum plastic film housing in crooked pressing process, cause the generation of bad order product., therefore application the present embodiment technical scheme is conducive to guarantee stability and the fail safe of the chemical property of lithium ion battery, be conducive to reduce the fraction defective of product.
As the signal one of the present embodiment, shown in Figure 5, in the stacked battery core body of the present embodiment arc, each described positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: the first barrier film, the second barrier film.Wherein the first barrier film, the second barrier film are respectively over against the top that is positioned at each positive plate 500, bottom; Form respectively not consecutive at least two heat-sealing sealings at least two longitudinal edges of the first barrier film, the second barrier film, described the first barrier film, the second barrier film connect at each described heat-sealing sealing part hot melt.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction in embodiment 1.
Alternatively, in the stacked battery core body of the present embodiment arc, in each positive plate diaphragm bag, each not consecutive interval heat-sealing sealing is separately positioned on the edge of the first barrier film, the second barrier film.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction in embodiment 1.
As the signal two of the present embodiment, shown in Figure 6, in the stacked battery core body of the present embodiment arc, each described positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: the first barrier film, the second barrier film.Wherein the first barrier film, the second barrier film are respectively over against the top that is positioned at each described positive plate 500, bottom; Form respectively the heat-sealing sealing at least one width end of the first barrier film, the second barrier film, the first barrier film, the second barrier film connect at described heat-sealing sealing part hot melt.
Alternatively, in the stacked battery core body of the present embodiment arc, the hot-seal that is formed on the width end can be not consecutive spaced heat sealing, also can be a continuous heat-sealing sealing.
Alternatively, in the stacked battery core body of the present embodiment arc, can be respectively on the first barrier film, the second barrier film, the tab welding section 5001 of positive plate 500 arranges above-mentioned heat-sealing sealing on the first width end of stretching out, above-mentioned heat-sealing sealing also can be set on the second relative width end of the tab welding section 5001 with positive plate 500, above-mentioned hot-seal can also all be set at both ends.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction in embodiment 1.
As the signal three of the present embodiment, shown in Figure 7, in the stacked battery core body of the present embodiment arc, each described positive plate 500 can be assemblied in respectively in each diaphragm bag, and diaphragm bag comprises: the first barrier film, the second barrier film.Wherein the first barrier film, the second barrier film are respectively over against the top that is positioned at each described positive plate 500, bottom; Be formed with respectively the heat-sealing sealing on any at least two of four drift angles of the first barrier film, the second barrier film, the first barrier film, the second barrier film connect at heat-sealing sealing part hot melt.
Alternatively, in the stacked battery core body of the present embodiment arc, can be only at the first drift angle, the second drift angle, the 3rd drift angle, any two drift angles of the 4th drift angle, wantonly three drift angles or four drift angles of the first barrier film, the second barrier film, seal, the inventor finds in carrying out the utility model research process, only when two drift angle heat-sealings, adopt the technique of diagonal angle drift angle heat-sealing to be conducive to better positive plate 500 be positioned; Adopt four drift angle heat-sealings, can realize the location fully to positive plate 500, avoid the displacement of either direction.Further concrete preparation technology and beneficial effect can but be not limited to referring to the corresponding introduction in embodiment 1.
Embodiment 3:
the present embodiment provides laminated lithium ion battery and 2 differences of embodiment of the lithium ion battery that the present embodiment provides only to be, in the present embodiment, select the different positive plate of length 500, negative plate 1301, make the arc camber that coordinates arc laminated battery core body, along the arc of the stacked battery core body of arc direction from inside to outside, positive plate 500, the natural length of negative plate 1301 changes from short to long, thereby obtain at the stacked battery core body of arc both ends equal, the good neat lamination body of profile, further be conducive to improve the specification consistency of laminated lithium ion battery.
Experimental Comparison is analyzed:
, in order to further illustrate the technique effect of the present embodiment, below by the reference examples of same model specification and the documents analysis of experiments of the utility model embodiment, describe:
Reference examples: use prior art, directly the lithium-ion battery with aluminium plastic film of upper lower plane is carried out the arc lithium ion battery that crooked compacting obtains;
Embodiment 1: adopt the present embodiment 1, obtain the stacked battery core body of arc of the non-deformation moulding of nature, be assemblied in arc battery core body recess and carry out the arc lithium ion battery that the aluminum plastic film encapsulation obtains, wherein pole piece bag adopts the positive plate diaphragm bag to prepare scheme one;
Embodiment 2: adopt the present embodiment 1, obtain the stacked battery core body of arc of the non-deformation moulding of nature, be assemblied in arc battery core body recess and carry out the arc lithium ion battery that the aluminum plastic film encapsulation obtains, wherein pole piece bag adopts the positive plate diaphragm bag to prepare scheme two;
Embodiment 3: adopt the present embodiment 1, obtain the stacked battery core body of arc of the non-deformation moulding of nature, be assemblied in arc battery core body recess and carry out the arc lithium ion battery that the aluminum plastic film encapsulation obtains, wherein pole piece bag adopts the positive plate diaphragm bag to prepare scheme three;
, at 1000 battery samples, test the chemical property of lithium ion battery respectively, obtain the data shown in table one:
Table one: electrical property experiment data result contrast table
Therefore application the present embodiment technical scheme is conducive to reduce the bad order rate of product, improves the chemical property of product.
Above-described execution mode, do not form the restriction to this technical scheme protection range.The modification of doing within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.
Claims (4)
1. a positive plate diaphragm bag, is characterized in that, comprising: the first barrier film, the second barrier film, positive plate,
Described the first barrier film, the second barrier film are respectively over against the top that is positioned at described positive plate, bottom;
Form respectively not consecutive at least two heat-sealing sealings at least two longitudinal edges of described the first barrier film, the second barrier film, described the first barrier film, the second barrier film connect at each described heat-sealing sealing part hot melt.
2. positive plate diaphragm bag according to claim 1, is characterized in that,
Form respectively described heat-sealing sealing on the edge of described the first barrier film, the second barrier film.
3. a laminated lithium ion battery, is characterized in that, comprises stacked negative plate, positive plate diaphragm bag mutually,
Described positive plate diaphragm bag comprises: the first barrier film, the second barrier film, positive plate,
Described the first barrier film, the second barrier film are respectively over against the top that is positioned at described positive plate, bottom;
Form respectively not consecutive at least two heat-sealing sealings at least two longitudinal edges of described the first barrier film, the second barrier film, described the first barrier film, the second barrier film connect at each described heat-sealing sealing part hot melt;
Be separated with a curved membrane layer of natural moulding between respectively between arbitrary described positive plate, negative plate.
4. laminated lithium ion battery according to claim 3, is characterized in that,
Form respectively described heat-sealing sealing on the edge of described the first barrier film, the second barrier film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203085905U CN203288671U (en) | 2013-05-31 | 2013-05-31 | Positive plate diaphragm bag and laminated lithium ion battery with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203085905U CN203288671U (en) | 2013-05-31 | 2013-05-31 | Positive plate diaphragm bag and laminated lithium ion battery with same |
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| Publication Number | Publication Date |
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| CN203288671U true CN203288671U (en) | 2013-11-13 |
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| CN2013203085905U Expired - Lifetime CN203288671U (en) | 2013-05-31 | 2013-05-31 | Positive plate diaphragm bag and laminated lithium ion battery with same |
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Owner name: SHENZHEN NENGRUI INNOVATIVE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SHENZHEN GREPOW BATTERY CO., LTD. Effective date: 20150528 |
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