CN104143652A - Bipolar battery and packaging method thereof - Google Patents
Bipolar battery and packaging method thereof Download PDFInfo
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- CN104143652A CN104143652A CN201310170046.3A CN201310170046A CN104143652A CN 104143652 A CN104143652 A CN 104143652A CN 201310170046 A CN201310170046 A CN 201310170046A CN 104143652 A CN104143652 A CN 104143652A
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- double polarity
- polarity plate
- fluid sealant
- injection portion
- fluid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
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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
- 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
Abstract
The invention discloses a bipolar battery and a packaging method thereof. The bipolar battery comprises two half shells and bipolar plates. The method comprises the following steps: packaging the bipolar plates and the adjacent half shells by using a first sealant in an area outside a liquid injection portion, allowing the sidelines of the bipolar plates to be positioned at the inner sides of the sidelines of the half shells respectively at least in the injection portion, sealing and boning the edges of the bipolar plates with the first sealant, sealing and bonding the edges of the two half shells with the first sealant, and embedding the edges of the bipolar plates into the first sealant. Hot press is directly applied to the half shells and the first sealant, so packaging is simplified. Heat during hot press is not directly applied to the bipolar plates, and is conducted to the bipolar plates through the first sealant, so the influences of the hot press on the bipolar battery are reduced.
Description
Technical field
The present invention relates to bipolar battery, particularly, relate to a kind of bipolar battery and method for packing thereof.
Background technology
In prior art, for increasing the output voltage of battery, can adopt the double polarity plate and the mutual alternately laminated mode of barrier film that both sides are applied respectively to positive electrode active materials and negative active core-shell material.But, for example, while making this battery (disclosed bipolar battery in US2010/025537A1), need between the edge of two double polarity plates of barrier film that is separated with one or more layers, inject electrolyte and insulation is set and seal so that encapsulation, for this reason, often a double polarity plate is set all need in the space being limited by this double polarity plate, injects electrolyte, then at its edge or the edge of the barrier film being adjacent arrange insulation and seal to carry out packaging by hot pressing, manufacture craft is very loaded down with trivial details and be unfavorable for changing, safeguard, and, be laminated to after can obtaining required output voltage and must using mechanical force to compress at the periphery of housing, to obtain the sealing effectiveness requiring, further increased the difficulty of manufacture craft and maintenance.In addition, when hot sealing, hot pressing acts directly on double polarity plate, double polarity plate for example, is made by the good material of heat conduction (metal, carbon material) conventionally, heat can be delivered to the space of injecting electrolyte by double polarity plate, cause diaphragm deflection, electrolyte volatilization, affect the performance of battery.Meanwhile, this kind of structure cannot solve battery and change into the exhausting problem of aerogenesis afterwards.
Summary of the invention
The object of this invention is to provide a kind of method for packing that encapsulation and the heat when can avoid or weaken hot pressing are transmitted to the bipolar battery of inside battery of being convenient to.
To achieve these goals, the invention provides a kind of method for packing of bipolar battery, described bipolar battery comprises two and half housings, the battery core that is arranged on the double polarity plate between described two and half housings and is electrically connected with described double polarity plate, described method comprises: the region beyond fluid injection portion, utilize the first fluid sealant to encapsulate described double polarity plate and half adjacent housing, at least in described fluid injection portion, make the sideline of described double polarity plate be positioned at the inner side in the sideline of described half housing, by the edge of described double polarity plate and the first sealant sealing bonding, by the edge of described two and half housings and described the first sealant sealing bonding, the edge of described double polarity plate is embedded to described the first fluid sealant.
The present invention also provides a kind of bipolar battery, comprising: double polarity plate; Be electrically connected to the battery core of described double polarity plate; Coated described double polarity plate and described battery core half housing in the inner; With the first fluid sealant of be used for being sealing adhesive described half housing and double polarity plate, wherein, at least in fluid injection portion, the sideline of described double polarity plate is positioned at the inner side in the sideline of described half housing, and the edge of described double polarity plate embeds described the first fluid sealant.
The present invention provides again a kind of bipolar battery, and it adopts above-mentioned method for packing to make.
By technique scheme, injecting the seal operation of carrying out after electrolyte, hot pressing acts directly on half housing and the first fluid sealant, has simplified encapsulation.And heat does not act directly on double polarity plate, but be transmitted on double polarity plate through the first fluid sealant.The first fluid sealant is jointing material, and jointing material is generally the material that thermal conductance is very low, thereby the heat that is transmitted to double polarity plate seldom, reduced the impact of hot pressing on bipolar battery.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 a to Fig. 1 f is a kind of schematic diagram of execution mode of the method for packing of explanation bipolar battery of the present invention;
Fig. 2 is the schematic diagram of the another kind of execution mode of explanation bipolar battery of the present invention;
Fig. 3 and Fig. 4 are the schematic diagrames of another kind of execution mode of the method for packing of explanation bipolar battery of the present invention.
Description of reference numerals
3: the second half housings of 2: the first half housings
4: double polarity plate 41: aluminium sheet/paper tinsel 42: copper coin/paper tinsel 5: battery core
5a: the first battery core 5b: the second battery core
6: lead-in wire 6a: the first positive wire 6b: the second positive wire
7a: the first negative wire 7b: the second negative wire
8 ': two-sided positive plate
9 ': two-sided negative plate
12: barrier film 13: tab
15: the second fluid sealants 16 of 14: the first fluid sealants: auxiliary viscose glue
20: lug 21: positive pole ear 22: negative lug
A: the first sealing B: the second sealing C: air chamber D: edge sealing
S: half housing I: the I-1 of fluid injection portion: the first I-2 of fluid injection portion: the second fluid injection portion
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that not doing contrary explanation, the noun of locality of use typically refers to reference to upper and lower, left and right shown in the drawings as " upper and lower, left and right "; " inside and outside " refers to inside and outside with respect to the profile of each parts itself.In addition, in the present invention, " a plurality of " represent two or more.
According to an aspect of the present invention, provide a kind of bipolar battery, it comprises: double polarity plate 4; Be electrically connected to the battery core 5 of described double polarity plate 4; Coated described double polarity plate 4 and described battery core 5 half housing S in the inner; The first fluid sealant 14 be used for being sealing adhesive described half housing S and double polarity plate 4, wherein, at least, at the I of fluid injection portion, the sideline of described double polarity plate 4 is positioned at the inner side in the sideline of described half housing S, and the edge of described double polarity plate 4 embeds described the first fluid sealant 14.
Shown in please refer to the drawing 2 to Fig. 4, in bipolar battery of the present invention, between described double polarity plate 4 and adjacent half housing S, be provided with battery core 5, thereby can reach by double polarity plate 4 object of series connection battery core 5.
Known to persons skilled in the art, double polarity plate refers to that both sides are used separately as the pole plate of anode collection device and negative pole currect collecting device, and can be by applying positive electrode active materials respectively on two of double polarity plate contrary surfaces and negative active core-shell material forms bipolar electrode.In the present invention, the both sides of double polarity plate 4 can apply respectively both positive and negative polarity active material, also can not apply active material, and the effect of the double polarity plate 4 of uncoated active material only, for forming internal series-connection, can not provide inside battery to react required material.Double polarity plate 4 can adopt various suitable materials to make, for example, can adopt Cu-Al composite plate, graphite cake, carbon fiber board, aluminium sheet/paper tinsel or copper coin/paper tinsel.If the negative active core-shell material of used in battery is the electronegative potential materials such as carbon, graphite or Graphene, double polarity plate 4 preferably adopts Cu-Al composite plate (wherein the corresponding negative pole of copper side, aluminium side is corresponding anodal), graphite cake, carbon fiber board and copper coin/paper tinsel.In the illustrated execution mode of 1a, double polarity plate 4 adopts Cu-Al composite plate.In the execution mode of Fig. 3 and Fig. 4, can be first Al plate/paper tinsel and Cu plate/paper tinsel be packaged in respectively to the first half housings 2 and the second half housings 3, while then in the end encapsulating, by bonding or mechanical force, make Al plate/paper tinsel contact and form Cu-Al composite plate with Cu plate/paper tinsel.The one side of Cu-Al composite plate is aluminium face, and one side is copper face, and aluminium face scribbles positive electrode active materials, and copper face scribbles negative active core-shell material.
In the present invention, as shown in Figure 2, described double polarity plate 4 can and be a plurality of chambers by the internal separation of the whole housing being assembled by two and half housing S at least one, in each chamber, can be provided with a battery core 5, described in each, battery core 5 can comprise respectively single lattice battery unit of a single lattice battery unit or a plurality of parallel connections, and described a plurality of battery core 5 forms series connection by described double polarity plate 4.
In the situation that having a plurality of double polarity plate 4, preferably, described double polarity plate 4 is a plurality of for what be arranged in parallel, and described the first fluid sealant 14 is arranged between outermost double polarity plate 4 and the described half housing S adjacent with this double polarity plate 4.Wherein, described bipolar battery can comprise a plurality of battery cores 5 that are electrically cascaded by described double polarity plate 4.In addition, described bipolar battery also comprises a plurality of the second fluid sealants 15 that are arranged between described double polarity plate 4.
As shown in Figure 3 and Figure 4, the battery core of lithium ion battery of take is example, each battery core 5 of the present invention can comprise single or multiple single lattice battery units parallel with one another, and each single lattice battery unit can comprise anode collection device, negative pole currect collecting device, positive electrode active materials, negative active core-shell material and barrier film.Current collector by copper, aluminium or copper aluminium is compound etc., make by electric conducting material.The anode collection device that is coated with positive electrode active materials forms positive pole, and the negative pole currect collecting device that is coated with negative active core-shell material forms negative pole, and barrier film is used for isolating positive and negative electrode and only allows lithium ion to pass through.Selectively, single lattice battery unit also can comprise two-sided positive plate 8 ' described below, two-sided negative plate 9 ' and barrier film 12.It should be noted that, the structure of above-mentioned single lattice battery unit and battery core 5 is concrete execution modes of the present invention, the present invention does any restriction to the structure of single lattice battery unit or battery core 5 unintentionally, and any battery core that comprises one or more single lattice battery units 5 all can be used for the present invention.
In the present invention, while being carbon and graphite etc. as negative material, the anode collection device of battery core 5 and negative pole currect collecting device can be made by aluminium foil and Copper Foil respectively, while being lithium titanate as negative material, both positive and negative polarity current collector all can be made by aluminium foil, for example, by the aluminium foil of 0.01-0.04mm, make; Positive electrode active materials can be LFP, cobalt acid lithium, LiMn2O4 and ternary material etc., and coating thickness is 0.01-0.2mm; Negative active core-shell material is LTO, C, graphite, Graphene etc., and coating thickness is 0.01-0.2mm; The electrolyte injecting can be lithium hexafluoro phosphate.
In the preferred embodiment of the present invention, as shown in Fig. 1 a and Fig. 2, described battery core 5 is electrically connected by lead-in wire 6 and double polarity plate 4.Lead-in wire 6 comprises positive wire and negative wire, and anode collection device is connected with positive wire respectively described in each of battery core 5, and each negative pole currect collecting device of battery core 5 is connected with negative wire respectively.Positive wire can be connected with double polarity plate 4 with the one in negative wire, and another one can be drawn by lug 20.
In the present invention, each goes between 6 can be independent assembly, can be also the extension of current collector, at this, does not limit.In addition, each goes between and 6 can link together in the end of drawing, to be connected to together corresponding lug or double polarity plate 4.
Be understandable that, those skilled in the art can arrange each lead-in wire and lug by various suitable modes, as long as be convenient to, by corresponding lug, draw or are connected on double polarity plate 4.For example, the positive wire and the negative wire that are connected with described double polarity plate 4 are positioned at the same side, from the positive wire of drawing between described the first half housings 2 and the second half housings 3 and negative wire and lug 20, are positioned at opposite side.Thus, can avoid on the one hand the mutual interference between the lug of the opposed polarity in same chamber, can reduce on the other hand and generate heat and make battery Homogeneouslly-radiating.Certainly, also can be as shown in Figure 1a, make to go between 6 and lug 20 be positioned at the same side.
Selectively, the positive wire being connected with described double polarity plate 4 and negative wire also never homonymy draw, to make the bearing of trend of positive pole ear and negative lug different.In addition, the positive wire of same battery core 5 and negative wire can be positioned at the same side or homonymy not.
Wherein, the position of drawing at lug 20 can be provided with insulating sealer, for example tab 13 described below, the first fluid sealant 14 and the second fluid sealant 15 between described double polarity plate 4, the first half housings 2, the second half housings 3 and lug 20.
Particularly, in the position of the non-fluid injection I of portion, the marginal position of double polarity plate 4 is tightly connected by the first fluid sealant 14 thereon of bonding and the first half housings 2 and the second half housings 3.As shown in Figure 1a, at the extraction location of lug 20, between described lug 20 and described half housing S, pass through tab 13 insulated enclosures; Between lug 20 and described double polarity plate 4, by tab 13 and the first fluid sealant 14 insulated enclosures, wherein said tab 13 contacts described lug 20, the described double polarity plate 4 of described the first fluid sealant 14 contact; Between described double polarity plate 4 and described the first half housings 2 and the second half housings 3 by the first fluid sealant 14 insulated enclosures; In the situation that thering is a plurality of double polarity plate 4, between adjacent described double polarity plate 4 by the second fluid sealant 15 insulated enclosures (as shown in Figure 2).
Wherein: the one side of tab 13 is for realizing the sealing between lug and half housing S, and another side is for merging and form sealing with the first fluid sealant 14; The object of using the first fluid sealant 14 is to guarantee insulation between half housing S and double polarity plate 4 and insulation and the sealing between sealing and lug and double polarity plate 4; The second 15 of fluid sealants are for adjacent two double polarity plates 4 of viscose glue, to realize insulation and the sealing between the two.Therefore, also tab 13 can be made to one corresponding to the one side of the first fluid sealant 14 with the first fluid sealant 14, be used to form insulation and sealing between lug and double polarity plate 4.Can find out, above-mentioned tab 13 and the first fluid sealant 14 and the second fluid sealant 15 difference slightly in function, but common tab all can meet above-mentioned requirements in the market.
The I of fluid injection portion after sealing, as shown in Figure 1 d, the sideline of described double polarity plate 4 is positioned at the inner side in the sideline of described half housing S, and the edge of described double polarity plate 4 embeds in described the first fluid sealant 14.
Preferably, described bipolar battery also comprises the second potted line A2 in the outside, sideline that is positioned at described double polarity plate 4, and the distance in the sideline of described the second potted line A2 and described double polarity plate 4 is not more than 2 millimeters.The second potted line A2 for carrying out secondary hot pressing encapsulation (in detail as mentioned below) after exhaust.In addition, after secondary hot pressing encapsulation, because inside battery is isolated with external environment condition, therefore it is less to the performance impact of battery to be added to the heat of the short time on double polarity plate 4, therefore in order to improve whole heat-sealing effect, reduce possible gas or the diffusion of electrolyte, also can carry out three times packaging by hot pressing, thereby make described the first fluid sealant 14 be sealing adhesive described half housing S, double polarity plate 4 and the overlapped part of the first fluid sealant 14.
In addition, preferably, can make described half housing S at least at the I of fluid injection portion, by flexible packing material, be made, thereby be more convenient to assembling and safeguard, this is described in detail hereinafter.In country's packing generic term (GB4122-83), flexible package is defined as: flexible package refers in filling or takes out after content the packing that container shapes can change.Made various bags, the box of paper using, aluminium foil, fiber, plastic film and their compound, overlap, seal etc. and be flexible package.Indication flexible packing material of the present invention also needs to meet the requirement of the corrosion of electrolyte resistance in battery and low ventilative and water penetration.More preferably, can half housing S integral body form flexible package, thereby be encapsulated as the housing of whole flexible package.Flexible packing material can for the materials such as aluminum-plastic composite membrane or modified poly ethylene, polypropylene (for example can used thickness be 0.08-0.18mm Japan HuoDNP company of Zhao He company produce packing aluminum-plastic composite membrane).
According to a further aspect in the invention, a kind of method for packing of bipolar battery is provided, described bipolar battery comprises two and half housing S, the battery core 5 that is arranged on the double polarity plate 4 between described two and half housing S and is electrically connected with described double polarity plate 4, described method comprises: the region beyond the I of fluid injection portion, utilize the first fluid sealant 14 described double polarity plate 4 of encapsulation and half adjacent housing S, at least at the described fluid injection I of portion, make the sideline of described double polarity plate 4 be positioned at the inner side in the sideline of described half housing S, the edge of described double polarity plate 4 and the first fluid sealant 14 are sealing adhesive, the edge of described two and half housing S and described the first fluid sealant 14 are sealing adhesive, the edge of described double polarity plate 4 is embedded to described the first fluid sealant 14.
By encapsulating two and half housing S and the first fluid sealant 14, can form complete housing.In encapsulation process, at the I of fluid injection portion, can be first by the edge of described double polarity plate 4 and described the first fluid sealant 14 hot sealings, then from the I of fluid injection portion, inject electrolyte, finally by hot pressing two and half housing S and the first fluid sealant 14, complete encapsulation, and final formation makes the edge of described double polarity plate 4 embed the structure of described the first fluid sealant 14.Thus, hot pressing acts directly on half housing S and the first fluid sealant 14, and heat does not act directly on double polarity plate 4, but is transmitted on double polarity plate 4 through the first fluid sealant 14.The first fluid sealant 14 is the jointing material that thermal conductance is very low, thereby the heat that is transmitted to double polarity plate 4 seldom, has avoided barrier film contraction distortion and electrolyte volatilization, thereby has reduced the impact of hot pressing on the performance of bipolar battery and safety.
Below with reference to Fig. 1 a to Fig. 1 f, illustrate according to a kind of execution mode of method for packing of the present invention, wherein Fig. 1 b to Fig. 1 d is positioned at the I of fluid injection portion on right side at the zoomed-in view of corresponding steps in Fig. 1 a, the vertical view that Fig. 1 e and Fig. 1 f encapsulate the bipolar battery of Fig. 1 a for explanation.Described method comprises: a, at the edge seal of described double polarity plate 4 described the first fluid sealant 14 that bonds, and described double polarity plate 4 is arranged between two and half housing S, make described the first fluid sealant 14 between described double polarity plate 4 and adjacent half housing S, and make at least at the described fluid injection I of portion, described the first fluid sealant 14 stretches out from the sideline of described double polarity plate 4; B, the region beyond the described fluid injection I of portion, the edge of half housing S described in hot pressing is, the edge of double polarity plate 4 and the first fluid sealant 14, with the edge of be sealing adhesive described half housing S and double polarity plate 4; C, from the described fluid injection I of portion, inject electrolyte; D, at the described fluid injection I of portion, along being positioned at half housing S described in the first potted line A1 hot pressing in sideline outside of described double polarity plate 4 and exceeding first fluid sealant 14 in described double polarity plate 4 sidelines, so that described half housing S and the first fluid sealant 14 form the first sealing A(as shown in Figure 1 b).
Particularly, during region beyond the I of fluid injection portion of encapsulation half housing S and double polarity plate 4, can utilize various suitable seals to seal by suitable mode, for example can hot pressing half housing S, double polarity plate 4 and fluid sealant (sealing glue can be identical or different with the kind of the first fluid sealant 14), to form edge sealing D(as shown in Fig. 1 e and Fig. 1 f).Because forming edge sealing D, hot pressing carried out before injecting electrolyte, therefore, even if heat acts directly on double polarity plate 4, also owing to not having conduction can not cause the volatilization of electrolyte to electrolyte, can not cause diaphragm deflection because of the barrier film conducting to battery core 5 by electrolyte, thereby can not affect the performance of bipolar battery yet.Selectively, the region beyond the I of fluid injection portion, also can utilize be bonded and sealed half housing S and double polarity plate 4 of suitable fluid sealant to form edge sealing D.
Understandable, before double polarity plate 4 being arranged between half housing S, first battery core is arranged on to the both sides of double polarity plate 4.Concrete operations following (bipolar battery of take comprises that a double polarity plate 4 is example):
First, on the relative two sides of double polarity plate 4, apply respectively positive electrode active materials and negative active core-shell material, to form bipolar electrode.In the upper and lower both sides at double polarity plate 4 edges by thermo-compression bonding the first fluid sealant 14.
Then, in the both sides of described double polarity plate 4, with series system, be electrically connected to respectively a battery core 5., each battery core 5 comprises at least one single lattice battery unit explained above.In addition, one of battery core 5 lead-in wire 6 can be comprised to the first half housings 2 and the second half housings 3 by lug 20 from half housing S() and double polarity plate 4 between draw, another lead-in wire 6 is connected to double polarity plate 4.Wherein, two battery cores 5 are drawn by the lug 20 of opposite polarity respectively, and by the lead-in wire 6 of opposite polarity, are connected to two surfaces of double polarity plate 4.
Then, by the first half housings 2 and the second half housings 3 from the coated battery core 5 in both sides and the edge clamping of double polarity plate 4 is located between the first half housings 2 and the second half housings 3.Wherein, can make the lug 20 of two battery cores 5 draw from the same side.
As mentioned above, the extraction location of lug 20 (left side in Fig. 1 a), can utilize tab 13 and first fluid sealant 14 each parts of bonding.Meanwhile, can utilize the region except the I of fluid injection portion of the first fluid sealant 14 hot sealing double polarity plates 4 and the first half housings 2 and the second half housings 3, to form edge sealing D.
After fluid injection completes, when carrying out a hot pressing fluid injection I of portion, as shown in Figure 1 b, the sideline of double polarity plate 4 is positioned at the inner side in the sideline of half housing S, and the first fluid sealant 14 stretches out from the sideline of double polarity plate 4.Along the potted line A1 in outside that is positioned at the sideline of double polarity plate 4, carry out a hot pressing, can make the edge of two and half housing S by the first fluid sealant 14 packaging by hot pressing, as shown in Figure 1 b in the sealing I of fluid injection portion forming the first sealing A.Obviously, in a hot pressing, heat Main Function is at the I of fluid injection portion, only have a small amount of heat to be transmitted to double polarity plate 4 by the first fluid sealant 14, this a small amount of heat can not exert an influence to injecting electrolyte and the barrier film 12 of battery substantially, thereby substantially can not affect the performance of bipolar battery.
Understandable, because lug is also to be made by good Heat Conduction Material, therefore, the position of the I of fluid injection portion and the extraction location of lug should be different.In other words, the extraction location of lug is positioned at the I of fluid injection portion region in addition.
Because the battery after encapsulation need to change into, in formation process, may produce gas, if can not discharge in time these gas, may exert an influence to the performance of battery.Therefore, preferably, described method also comprises: e, change into described bipolar battery, f, excise described the first sealing A, and discharge the gas (gas is extracted out from the air chamber C between the first potted line A1 and the second potted line A2) producing while changing into described bipolar battery, g, along the second potted line A2(between described the first potted line A1 and described double polarity plate 4 sidelines as shown in Fig. 1 e) to as described in half housing S and and exceed as described in first fluid sealant 14 in double polarity plate (4) sideline carry out secondary hot pressing (as shown in the P2 in Fig. 1 c), so that described half housing S and the first fluid sealant 14 form the second sealing B, and make the inward flange of described the second sealing B and the EDGE CONTACT of described double polarity plate 4 and form heat-seal (as shown in Figure 1 d), after secondary encapsulation completes, the edge of described double polarity plate 4 embeds described the first fluid sealant 14.
Thus, can discharge the gas producing when battery changes into by excising the first sealing A, thereby avoid changing into the impact of the gas of generation on battery performance.In addition, after exhaust, by secondary hot pressing, bipolar battery is encapsulated again.Wherein, for avoiding the heat of secondary hot pressing to be transmitted to inside battery by double polarity plate 4, affect barrier film 12 and electrolyte, during secondary hot pressing, still in the outside at the edge of double polarity plate 4, carry out.Preferably, after the position of the second potted line A2 should make the melting of rear the first fluid sealant 14 of heat-sealing and half housing S edge partly expand, its inner edge contacts with the sideline of double polarity plate 4, form heat-sealing simultaneously, thereby the side effect while having avoided directly sealing on double polarity plate 4, has guaranteed again the sealing effectiveness after secondary hot pressing encapsulation.More preferably, the distance in the sideline of the second potted line A2 and double polarity plate 4 is not more than 2 millimeters.In addition, alternatively, after secondary hot pressing encapsulation, because inside battery is isolated with external environment condition, therefore it is less to the performance impact of battery to be added to the heat of the short time on double polarity plate 4, therefore in order to improve whole heat-sealing effect, reduce the diffusion of possible gas or electrolyte, also can carry out three times packaging by hot pressing.That is, the second sealing B and described half housing S, double polarity plate 4 and the overlapped part of the first fluid sealant 14 described in hot pressing again, directly to seal the first half housings 2, the second half housings 3, double polarity plate 4 and the first fluid sealant 14.
Below with reference to Fig. 3 and Fig. 4, illustrate according to the another kind of execution mode of the method for packing of bipolar battery of the present invention.Wherein, described half housing S comprises the first half housings 2 and the second half housings 3, described double polarity plate 4 comprises that (double polarity plate 4 consisting of aluminium sheet/paper tinsel 41 and copper coin/paper tinsel 42 of take is example for anode collection device and negative pole currect collecting device, as shown in Figure 3 and Figure 4, wherein, aluminium sheet/paper tinsel 41 is as anode collection device, copper coin/paper tinsel 42 is as negative pole currect collecting device), the described fluid injection I of portion comprises the first I-1 of fluid injection portion and the second I-2 of fluid injection portion, described method comprises: a ', described the first fluid sealant 14 is set at the edge of described anode collection device, make described the first fluid sealant 14 between described anode collection device and described the first half housings 2, and make at described the first I-1 of fluid injection portion, described the first fluid sealant 14 stretches out from the sideline of described anode collection device, described the first fluid sealant 14 is set at the edge of described negative pole currect collecting device, make described the first fluid sealant 14 between described negative pole currect collecting device and described the second half housings 3, and make at described the second I-2 of fluid injection portion, described the first fluid sealant 14 stretches out from the sideline of described negative pole currect collecting device, b ', the region beyond described the first I-1 of fluid injection portion, described in hot pressing, the first half edges of housing 2 are, the edge of described anode collection device and described the first fluid sealant 14, to encapsulate the edge of described the first half housings 2 and anode collection device, and at described the first I-1 of fluid injection portion, edge and described first fluid sealant 14 of anode collection device described in hot pressing, region beyond described the second I-2 of fluid injection portion, described in hot pressing, the second half edges of housing 3 are, the edge of described negative pole currect collecting device and described the first fluid sealant 14, to encapsulate the edge of described the second half housings 3 and negative pole currect collecting device, and at described the second I-2 of fluid injection portion, edge and described first fluid sealant 14 of negative pole currect collecting device described in hot pressing, c ' is so that the contact of described anode collection device and negative pole currect collecting device the mode between described the first half housings 2 and the second half housings 3 connect described anode collection device and negative pole currect collecting device, so that described anode collection device and negative pole currect collecting device form described double polarity plate 4, and make the position correspondence of described the first I-1 of fluid injection portion and the second I-2 of fluid injection portion to form the described fluid injection I of portion, d ', from described the first I-1 of fluid injection portion to described anode collection device with between the first half housings 2, inject electrolyte, from described the second I-2 of fluid injection portion to described negative pole currect collecting device with between the second half housings 3, inject electrolyte, e ', at the described fluid injection I of portion place, along being positioned at described in the first potted line A1 hot pressing in sideline outside of described double polarity plate (4) the first half housings 2, described the second half housings 3 and exceeding first fluid sealant 14 in described double polarity plate 4 sidelines, so that described the first half housings 2, the second half housings 3 and the first fluid sealant 14 form the first sealing A.
In present embodiment, by first the anode collection device of double polarity plate 4 and the first half housings 2 being fitted together, and the negative pole currect collecting device of double polarity plate 4 and the second half housings 3 are fitted together, and then carry out the operations such as fluid injection, encapsulation, further simplified the encapsulation of bipolar battery of the present invention.
Particularly, as shown in Figure 4, first between aluminium sheet/paper tinsel 41 and the first half housings 2, encapsulating first battery core 5a(the first battery core 5a can form by the mode of stacked two-sided positive plate 8 ', barrier film 12 and two-sided negative plate 9 '), and between copper coin/paper tinsel 42 and the second half housings 3, encapsulate second battery core 5b(the second battery core 5b and also can form by the mode of stacked two-sided positive plate 8 ', barrier film 12 and two-sided negative plate 9 ').
Wherein, the first battery core 5a comprises the first negative wire 7a and the first positive wire 6a, and the second battery core 5b comprises the second negative wire 7b and the second positive wire 6b.Described the first negative wire 7a draws between described the first half housings 2 and double polarity plate 4 by negative lug 22, described the second positive wire 6b draws between described double polarity plate 4 and the second half housings 3 by positive pole ear 21, the negative pole currect collecting device (in Fig. 3, this negative pole currect collecting device is coated with negative active core-shell material) of described the second negative wire 7b and the double polarity plate 4 adjacent with described the second half housings 3 is connected, the anode collection device (in Fig. 3, this anode collection device is coated with positive electrode active materials) of the first positive wire 6a and the double polarity plate 4 adjacent with described the first half housings 2 is connected.In edge, between negative lug 22, aluminium sheet/paper tinsel 41 and the first half housings 2 by tab 13 and the first fluid sealant 14 insulated enclosures; Between positive pole ear 21, copper coin/paper tinsel 42 and the second half housings 3 by tab 13 and the first fluid sealant 14 insulated enclosures.
Then, connect aluminium sheet/paper tinsel 41 and copper coin/paper tinsel 42, make the side of its uncoated active material relative.Can exposed copper coin/paper tinsel 42 and aluminium sheet/paper tinsel 41 is bonding or formed and electrically contacted by mechanical force, make aluminium sheet/paper tinsel 41 and copper coin/paper tinsel 42 form double polarity plates 4 and finally by above-mentioned method for packing, encapsulate to form the bipolar battery shown in Fig. 4.
Equally preferably, the gas producing while changing in order to discharge, in step e ', implements hot pressing along the first potted line A1, and the method also comprises: f ', change into described bipolar battery; G ', excise described the first sealing A, and discharge the gas producing while changing into described bipolar battery; H ', along the second potted line A2 that is positioned at described the first potted line A1 inner side, described the first half housings 2, the second half housings 3 and the first fluid sealant 14 of exceeding described double polarity plate (4) sideline are carried out to secondary hot pressing, so that described the first half housings 2, the second half housings 3 and the first fluid sealant 14 form the second sealing B, and make the inner edge of described the second sealing B and the sideline of described double polarity plate 4 contact and form heat-seal.In addition, alternatively, after secondary hot pressing encapsulation, because inside battery is isolated with external environment condition, therefore it is less to the performance impact of battery to be added to the heat of the short time on double polarity plate 4, therefore in order to improve whole heat-sealing effect, reduce the diffusion of possible gas or electrolyte, also packaging by hot pressing be can carry out three times, the first half housings 2, the second half housings 3, double polarity plate 4 and the first fluid sealant 14 now can be directly sealed.
In addition, in the preferred embodiment of the present invention, as shown in Figure 2, and can be when described the first fluid sealant 14 be set, auxiliary viscose glue 16 is set between described the first fluid sealant, make the edge of this auxiliary viscose glue 16 and described double polarity plate 4 adjacent and be spaced from each other.As mentioned above, edge at double polarity plate 4, form the structure of the thickness that comprises double polarity plate 4, the first fluid sealant 14 and half housing S, and in the edge of half housing S, formed structure only comprises the first fluid sealant 14 of hot pressing and the thickness of half housing S.Therefore,, by auxiliary viscose glue 16 is set, can make up the thickness difference of the edge of double polarity plate 4 and the edge of half housing S.
In addition, preferably, described half housing S is made by flexible packing material, to carry out packaging by hot pressing.In addition, flexible packing material is also conducive to excise the operation of the first sealing A.
In addition, as shown in Figure 2, described double polarity plate 4 can be a plurality of for what be arranged in parallel, described the first fluid sealant 14 is arranged between outermost double polarity plate 4 and the described half housing S adjacent with this double polarity plate 4, and described method is also included in the second fluid sealant 15 is set between a plurality of described double polarity plates 4.
The first fluid sealant 14(and tab 13 herein, the second fluid sealant 15, auxiliary seal glue 16) be jointing material, for example, for being selected from the polypropylene of high molten intensity, polyethylene, modified poly ethylene, polyurethane, thermoplastic olefin rubber, polyamide-based resins, polytetrafluoroethylene, Kynoar, polystyrene, in silicon rubber a kind of/or their mixture, above-mentioned material is the material that thermal conductance is very low, thereby the heat that is transmitted to double polarity plate 4 seldom, diaphragm deflection and electrolyte volatilization have been avoided, thereby reduced the impact of hot pressing on the performance of bipolar battery.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, between various execution mode of the present invention, also can carry out combination in any, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (17)
1. the method for packing of a bipolar battery, described bipolar battery comprises two and half housings (S), the battery core (5) that is arranged on the double polarity plate (4) between described two and half housings (S) and is electrically connected with described double polarity plate (4), described method comprises: in fluid injection portion (I) region in addition, utilize the first fluid sealant (14) to encapsulate described double polarity plate (4) and adjacent half housing (S), at least in described fluid injection portion (I), make the sideline of described double polarity plate (4) be positioned at the inner side in the sideline of described half housing (S), the edge of described double polarity plate (4) and the first fluid sealant (14) are sealing adhesive, the edge of described two and half housings (S) and described the first fluid sealant (14) are sealing adhesive, so that the edge of described double polarity plate (4) is embedded to described the first fluid sealant (14).
2. the method for packing of bipolar battery according to claim 1, wherein, described method comprises:
A, at the edge seal of described double polarity plate (4) described the first fluid sealant (14) that bonds, and described double polarity plate (4) is arranged between two and half housings (S), described the first fluid sealant (14) is positioned between described double polarity plate (4) and adjacent half housing (S), and make at least in described fluid injection portion (I), described the first fluid sealant (14) stretches out from the sideline of described double polarity plate (4);
B, in described fluid injection portion (I) region in addition, the edge of half housing (S) described in hot pressing is, the edge of double polarity plate (4) and the first fluid sealant (14), with the edge of be sealing adhesive described half housing (S) and double polarity plate (4);
C, from described fluid injection portion (I), inject electrolyte;
D, in described fluid injection portion (I), along being positioned at half housing (S) described in the first potted line (A1) hot pressing in sideline outside of described double polarity plate (4) and exceeding first fluid sealant (14) in described double polarity plate (4) sideline, so that described half housing (S) and the first fluid sealant (14) formation the first sealing (A).
3. the method for packing of bipolar battery according to claim 2, wherein, described method also comprises:
E, change into described bipolar battery;
F, excise described the first sealing (A), and Exhaust Gas;
G, along being positioned at the second potted line (A2) between described the first potted line (A1) and described double polarity plate (4) sideline, described half housing (S) and the first fluid sealant (14) of exceeding described double polarity plate (4) sideline are carried out to hot pressing, so that described half housing (S) and the first fluid sealant (14) formation the second sealing (B).
4. the method for packing of bipolar battery according to claim 1, wherein, described half housing (S) comprises the first half housings (2) and the second half housings (3), described double polarity plate (4) comprises anode collection device and negative pole currect collecting device, described fluid injection portion (I) comprises the first fluid injection portion (I-1) and the second fluid injection portion (I-2), and described method comprises:
A ', described the first fluid sealant (14) is set at the edge of described anode collection device, described the first fluid sealant (14) is positioned between described anode collection device and described the first half housings (2), and make in described the first fluid injection portion (I-1), described the first fluid sealant (14) stretches out from the sideline of described anode collection device; Described the first fluid sealant (14) is set at the edge of described negative pole currect collecting device, described the first fluid sealant (14) is positioned between described negative pole currect collecting device and described the second half housings (3), and make in described the second fluid injection portion (I-2), described the first fluid sealant (14) stretches out from the sideline of described negative pole currect collecting device;
B ', in described the first fluid injection portion (I-1) region in addition, described in hot pressing, the first half edges of housing (2) are, the edge of described anode collection device and described the first fluid sealant (14), to encapsulate the edge of described the first half housings (2) and anode collection device, and in described the first fluid injection portion (I-1), edge and described first fluid sealant (14) of anode collection device described in hot pressing; In described the second fluid injection portion (I-2) region in addition, described in hot pressing, the second half edges of housing (3) are, the edge of described negative pole currect collecting device and described the first fluid sealant (14), to encapsulate the edge of described the second half housings (3) and negative pole currect collecting device, and in described the second fluid injection portion (I-2), edge and described first fluid sealant (14) of negative pole currect collecting device described in hot pressing;
C ' is so that described anode collection device and negative pole currect collecting device contact and the mode that is positioned between described the first half housings (2) and the second half housings (3) connects described anode collection device and negative pole currect collecting device, so that described anode collection device and negative pole currect collecting device form described double polarity plate (4), and make the position correspondence of described the first fluid injection portion (I-1) and the second fluid injection portion (I-2) to form described fluid injection portion (I);
D ', from described the first fluid injection portion (I-1) to described anode collection device with between the first half housings (2), inject electrolyte, from described the second fluid injection portion (I-2) to described negative pole currect collecting device with between the second half housings (3), inject electrolyte;
E ', in described fluid injection portion (I), locate, along being positioned at described in the first potted line (A1) hot pressing in sideline outside of described double polarity plate (4) the first half housings (2), described the second half housings (3) and exceeding first fluid sealant (14) in described double polarity plate (4) sideline, so that described the first half housings (2), the second half housing (3) and the first fluid sealant (14) formation the first sealings (A).
5. the method for packing of bipolar battery according to claim 4, wherein, described method also comprises:
F ', change into described bipolar battery;
G ', excise described the first sealing (A), and Exhaust Gas;
H ', along being positioned at the second potted line (A2) between described the first potted line (A1) and described double polarity plate (4) sideline, described the first half housings (2), the second half housings (3) and the first fluid sealant (14) of exceeding described double polarity plate (4) sideline are carried out to hot pressing, so that described the first half housings (2), the second half housing (3) and the first fluid sealant (14) formation the second sealings (B).
6. according to the method for packing of the bipolar battery described in claim 3 or 5, wherein, described the second potted line (A2) is not more than 2 millimeters with the distance in the sideline of described double polarity plate (4).
7. according to the method for packing of the bipolar battery described in claim 3 or 5, wherein, described method also comprises step: in described fluid injection portion (I), and the second sealing (B) and described half housing (S), double polarity plate (4) and the overlapped part of the first fluid sealant (14) described in hot pressing again.
8. according to the method for packing of the bipolar battery described in any one in claim 1-4, wherein, described half housing (S) is made by flexible packing material.
9. according to the method for packing of the bipolar battery described in any one in claim 1-4, wherein, described double polarity plate (4) is a plurality of for what be arranged in parallel, described the first fluid sealant (14) is arranged between outermost double polarity plate (4) and described half housing (S) adjacent with this double polarity plate (4), and described method is also included in a plurality of the second fluid sealants (15) that are arranged between described double polarity plate (4).
10. a bipolar battery, is characterized in that, comprising:
Double polarity plate (4);
Be electrically connected to the battery core (5) of described double polarity plate (4);
Coated described double polarity plate (4) and described battery core (5) half housing (S) in the inner; With
Be used for being sealing adhesive first fluid sealant (14) of described half housing (S) and double polarity plate (4),
Wherein, at least at fluid injection portion (I), the sideline of described double polarity plate (4) is positioned at the inner side in the sideline of described half housing (S), and the edge of described double polarity plate (4) embeds described the first fluid sealant (14).
11. bipolar batteries according to claim 10, wherein, described double polarity plate (4) is a plurality of for what be arranged in parallel, and described the first fluid sealant (14) is arranged between outermost double polarity plate (4) and described half housing (S) adjacent with this double polarity plate (4).
12. bipolar batteries according to claim 11, wherein, described bipolar battery also comprises a plurality of the second fluid sealants (15) that are arranged between described double polarity plate (4).
13. bipolar batteries according to claim 10, wherein, described bipolar battery also comprises second potted line (A2) in the outside, sideline that is positioned at described double polarity plate (4), and described the second potted line (A2) is not more than 2 millimeters with the distance in the sideline of described double polarity plate (4).
14. bipolar batteries according to claim 13, wherein, described the first fluid sealant (14) be sealing adhesive described half housing (S), double polarity plate (4) and the overlapped part of the first fluid sealant (14).
15. according to the bipolar battery described in any one in claim 10-14, and wherein, described bipolar battery comprises a plurality of battery cores (5) that are electrically cascaded by described double polarity plate (4).
16. bipolar batteries according to claim 15, wherein, described half housing (S) is made by flexible packing material.
17. 1 kinds of bipolar batteries, is characterized in that, this bipolar battery is by making according to the method for packing described in any one in claim 1-9.
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Address after: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Patentee after: CHINA ENERGY INVESTMENT Corp.,Ltd. Patentee after: Beijing low carbon clean energy research institute Address before: 100011 Beijing Dongcheng District, West Binhe Road, No. 22 Shenhua building Patentee before: SHENHUA GROUP Corp.,Ltd. Patentee before: Beijing low carbon clean energy research institute |