CN103427108A - Lithium ion secondary battery and method for preparing lithium ion secondary battery - Google Patents
Lithium ion secondary battery and method for preparing lithium ion secondary battery Download PDFInfo
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- CN103427108A CN103427108A CN2012101609041A CN201210160904A CN103427108A CN 103427108 A CN103427108 A CN 103427108A CN 2012101609041 A CN2012101609041 A CN 2012101609041A CN 201210160904 A CN201210160904 A CN 201210160904A CN 103427108 A CN103427108 A CN 103427108A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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 lithium ion secondary battery and a method for preparing a lithium ion secondary battery. The lithium ion secondary battery comprises a polymer battery core, a battery circuit board and a battery case. A positive battery core pole piece, a negative battery core pole piece and an isolating membrane arranged between the positive battery core pole piece and the negative battery core pole piece are arranged inside the polymer battery core. The polymer battery core is packaged by a packaging membrane outside. The packaging membrane comprises a side packaging membrane and a top packaging membrane. The top packaging membrane can bend toward the plane of the top of the polymer battery core. The lithium ion secondary battery has high energy density and capacity.
Description
Technical field
The present invention relates to secondary cell, a kind of method that relates in particular lithium rechargeable battery and make lithium rechargeable battery.
Background technology
Because having, specific capacity is large, the discharge capacity advantages of higher is widely used in the electronic products such as mobile phone, notebook, digital camera for lithium rechargeable battery.
Mainly by polymer battery core, battery protection wiring board, gluing cap and lower glue cap, form etc. and to form in lithium rechargeable battery.When carrying out the lithium rechargeable battery encapsulation, the shared space of lithium rechargeable battery each several part is all comparatively fixing, wherein, this electrostrictive polymer core inner comprises anode pole piece, barrier film and cathode pole piece, and the battery core closedtop that has specified altitude assignment at the end that anode pole piece deviates from barrier film is encapsulated, because the battery core closedtop has occupied the certain altitude of this polymer battery core, thereby reduced the useful space of this electrostrictive polymer core inner.And the energy density of the space availability ratio lithium rechargeable battery of polymer battery core and capacity have than Important Relations, general, the space availability ratio of this polymer battery core is larger, the energy density of this lithium rechargeable battery and capacity are also larger, therefore, existing lithium rechargeable battery ubiquity because the space availability ratio of polymer battery core is low, and the lower problem of the energy density of the lithium rechargeable battery caused and capacity.
Summary of the invention
In view of this, a kind of method that the invention provides lithium rechargeable battery and make lithium rechargeable battery, have higher energy density and capacity in this battery.
For achieving the above object, the invention provides following technical scheme: a kind of lithium rechargeable battery, comprise the polymer battery core, cell circuit board and battery case, wherein, described electrostrictive polymer in-core is equipped with anodal battery core pole piece, negative pole battery core pole piece and be arranged at the barrier film between described anodal battery core pole piece and negative pole battery core pole piece, described polymer battery core outer enclosure has encapsulating film, described encapsulating film comprises side seal and closedtop, described closedtop is arranged at described polymer battery core top, wherein, the top of described polymer battery core is the end near described battery circuit board, described closedtop can be to place, the top plane bending of described polymer battery core.
Preferably, described anodal battery core pole piece offers some otch near an end of described closedtop;
Described negative pole battery core near an end of described closedtop offer with described anodal battery core pole piece on the otch of equal number;
Described anodal battery core pole piece and described negative pole battery core pole piece coiling form described polymer battery core, and the otch on described anodal battery core pole piece and the otch of described negative pole battery core pole piece are overlapped, described overlapped otch forms corner cut in top and the sidewall junction of polymer battery core;
Described closedtop can be along place, top plane bending from described corner cut to described polymer battery core.
Preferably, described closedtop is to place, the top plane bending of described polymer battery core, and the plane at described closedtop place is perpendicular to plane, described side seal place.
Preferably, described closedtop is that flexible material is made.
Preferably, on the top of described polymer battery core, positive pole and the negative pole of from described anodal battery core pole piece and negative pole battery core pole piece, drawing respectively, and described battery circuit board is connected with negative pole with described positive pole.
Preferably, described corner cut is the circular arc corner cut with certain radius.
Preferably, described electrostrictive polymer in-core also comprises: electrolyte.
On the other hand, a kind of method of making lithium rechargeable battery comprises:
Prepare anodal battery core pole piece and negative pole battery core pole piece;
Utilize described anodal battery core pole piece and described negative electrode chip structure polymer battery core, and between described anodal battery core pole piece and described negative pole battery core pole piece, barrier film is set;
Sidewall to described polymer battery core is encapsulated, and obtains side seal;
Top to described polymer battery core encapsulates the formation closedtop;
Place, top plane bending by from described closedtop to described polymer battery core.
Preferably, before utilizing the sidewall of described anodal battery core pole piece and described negative electrode chip structure polymer battery core, also comprise: at the desired location of described anodal battery core pole piece, offer some otch;
On the setting position of described negative pole battery core pole piece, offer with described anodal battery core pole piece on the otch of equal number;
While utilizing the sidewall of described anodal battery core pole piece and described negative electrode chip structure polymer battery core, otch on described anodal battery core pole piece and described negative electrode chip is overlapping, and reel described anodal battery core pole piece and described negative pole battery core piece structure polymer battery core, reel rear overlapping otch top and sidewall junction formation corner cut on the polymer battery core;
The described sidewall to described polymer battery core is encapsulated, and obtains side seal, comprising:
Sidewall to described polymer battery core is encapsulated, and obtains side seal, and the position and the described corner cut that at described side seal, in the corner cut with on described polymer battery core, overlap fit.
Preferably, described by described closedtop, the plane, place, top to described polymer battery core is bent, and comprising:
Place, top plane bending by closedtop along from described corner cut to described polymer battery core.
Preferably, place, the top plane bending by described closedtop along described corner cut to described polymer battery core specifically comprises:
Place, top plane bending by described closedtop along from described corner cut to described polymer battery core, until the plane at described closedtop place is perpendicular to plane, described side seal place.
Preferably, described corner cut is the circular arc corner cut with certain radius.
Preferably, also comprise:
On the top of described polymer battery core, positive pole and the negative pole of from described anodal battery core pole piece and negative pole battery core pole piece, drawing respectively, and described battery circuit board is connected with negative pole with described positive pole.
Known via above-mentioned technical scheme, compared with prior art, a kind of method that the present invention openly provides lithium rechargeable battery and made lithium rechargeable battery, this lithium rechargeable battery comprises the polymer battery core, cell circuit board and battery case, wherein, the electrostrictive polymer in-core is equipped with anodal battery core pole piece, negative pole battery core pole piece and be arranged at this positive pole battery core pole piece and negative pole battery core pole piece between barrier film, this polymer battery core outer enclosure has encapsulating film, this encapsulating film comprises side seal and closedtop, closedtop is arranged at polymer battery core top and perpendicular to plane, place, polymer battery core top, this closedtop can be to the top bending of described polymer battery core.Due to the top bending of this closedtop to the polymer battery core, take the height of polymer battery core thereby reduced closedtop, and then improved the space availability ratio of polymer battery core, and then improved energy density and the capacity of lithium rechargeable battery.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing provided other accompanying drawing.
Fig. 1 shows the hierarchical structure schematic diagram of existing lithium rechargeable battery;
Fig. 2 shows the composition structural representation of polymer battery core in lithium rechargeable battery of the present invention;
Fig. 3 shows the structural representation of the anodal battery core pole piece of polymer battery core in the present invention;
Fig. 4 shows the structural representation of lithium rechargeable battery in the present invention;
Fig. 5 shows a kind of schematic flow sheet of making an embodiment of method of lithium rechargeable battery of the present invention;
Fig. 6 shows a kind of schematic flow sheet of making another embodiment of method of lithium rechargeable battery of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
Energy density and capacity due to lithium rechargeable battery, relevant with the space availability ratio of polymer battery core in lithium rechargeable battery, general, in lithium rechargeable battery, the space availability ratio of polymer battery core is higher, the space availability ratio of this lithium rechargeable battery is also higher, and the energy density of this lithium rechargeable battery and capacity are also just larger.
Referring to Fig. 1, the composition hierarchical structure distribution schematic diagram of existing lithium rechargeable battery is shown, the composition of this lithium ion battery comprises successively: glue shell upper cover 1, cell circuit board 2, polymer battery core 3, PUR 4 and glue shell lower cover 5.In the situation that lithium rechargeable battery to take gross space certain, the shared space of each building block of the inside of lithium rechargeable battery is also certain, naturally the shared space of this polymer battery core is also certain.
Wherein, the polymer battery core mainly is comprised of anodal battery core pole piece, separator, negative pole battery core pole piece and closedtop 31, and after completing the encapsulation of polymer battery core, this closedtop extends to the direction near cell circuit board along the sidewall of polymer battery core, thereby the certain altitude of this polymer battery core that made this closedtop take, and this part height can not be utilized, and then reduced the space availability ratio of polymer battery core.By Fig. 1, visible, the total height of battery is L, and wherein, the total height of polymer battery core is L1, and the height of this closedtop is L2, and this closedtop has taken a part of space of polymer battery core.
Therefore, the inventor finds after deliberation, if can reduce the shared height of closedtop on this polymer battery core, can the effective depth of the core body of this polymer battery core will be increased, make anodal battery core pole piece in the polymer battery core, separator, the shared space of negative pole battery core pole piece increase, and then increased the useful space utilance of polymer battery core, improve energy density, and then improved energy density and the capacity of battery.
In order to realize above purpose, the invention discloses a kind of lithium rechargeable battery, this lithium rechargeable battery at least comprises polymer battery core, cell circuit board and battery case, this cell circuit board and polymer battery core all are arranged in battery case, this cell circuit board is arranged on the top of polymer battery core, and is connected with the polymer battery core.Wherein, this electrostrictive polymer in-core is equipped with anodal battery core pole piece, negative pole battery core pole piece and is arranged at the barrier film between described anodal battery core pole piece and negative pole battery core pole piece; In described polymer battery core outer enclosure, encapsulating film is arranged, described encapsulating film comprises side seal and closedtop, described closedtop is arranged at described polymer battery core top and, perpendicular to plane, place, described polymer battery core top, wherein, the top of described polymer battery core is the end near described battery circuit board.Unlike the prior art, the closedtop top of polymer battery core encapsulated can be to place, the top plane bending of this polymer battery core.
In order clearly to understand the solution of the present invention, referring to Fig. 2, show the composition structural representation of polymer battery core in a kind of lithium rechargeable battery of the present invention, these polymer battery core 3 inside are comprised of anodal battery core pole piece, negative pole battery core pole piece, the barrier film that is arranged between described anodal battery core pole piece and negative pole battery core pole piece, and the core body outer enclosure of this polymer battery core has encapsulating film, and be packaged with closedtop 31 on the core body top of this polymer battery core.
Wherein, barrier film plays buffer action, is mainly prevent between anodal battery core pole piece and negative pole battery core pole piece contacting and cause the problem of receiving part short circuit in lithium rechargeable battery.
When completing the encapsulation of polymer battery core, this closedtop 31 extends to the direction near battery circuit board along the core body sidewall of polymer battery core, thereby the certain altitude of this polymer battery core that made this closedtop take, as shown in Figure 2, this closedtop 31 along paper to battery circuit board one side extend.In order to reduce the height of closedtop, in the present embodiment, closedtop 31 is designed to be able to place, the top plane bending to described polymer battery core.Place, top plane bending by from closedtop 31 to the polymer battery core, can reduce the length that closedtop extends to the cell circuit board direction along the sidewall of polymer battery core, thereby reduced the proportion of height in polymer battery core total height of closedtop, improved the energy density of polymer battery core.
In Fig. 2, by this closedtop 31, the top bending to the polymer battery core is embodied in: this closedtop bends from paper to the direction perpendicular to paper, thereby the total length that has reduced closedtop 31 projection on paper reduces.
For fear of closedtop in the bending process, closedtop is damaged, or the associated components of damage polymer battery core 3, this positive pole battery core pole piece can be offered to some otch on the desired location near an end of closedtop in the present embodiment, offer some otch at negative pole battery core pole piece on the desired location near an end of closedtop simultaneously.Otch quantity on this positive pole battery core pole piece is identical with the otch quantity on negative pole battery core pole piece, and by anodal battery core pole piece and negative pole battery core pole piece when overlapping, the otch on anodal battery core pole piece overlaps with the otch on negative pole battery core pole piece.Referring to Fig. 3, for offer the schematic diagram of otch on the anodal battery core pole piece of polymer battery core, visible, on anodal battery core pole piece, an end offers several otch.The quantity of anodal battery core pole piece upper cut, and the spacing between each otch can be set according to the size of polymer battery core to be produced etc.The mode of offering otch on negative pole battery core pole piece is identical with the mode of offering otch on anodal battery core pole piece in Fig. 3.
Utilization offers the negative pole battery core pole piece of some otch and offers the anodal battery core pole piece coiling formation polymer battery core of some otch, and the otch on this positive pole battery core pole piece and the otch of described negative pole battery core pole piece are overlapped, this overlapped otch forms corner cut 32 in top and the sidewall junction of polymer battery core.This closedtop can be along place, top plane bending from described corner cut 32 to described polymer battery core, to the direction bending on the plane, sidewall place away from the polymer battery core.
Certainly, be provided with barrier film between this positive pole battery core pole piece and negative pole battery core pole piece before coiling.Electrostrictive polymer in-core in this formation has electrolyte.
When utilizing with the anodal battery core pole piece of otch and negative pole battery core pole piece coiling polymer battery core, length between two otch of usining on anodal battery core pole piece (negative pole battery core pole piece) is as the transverse width of polymer battery core, in winding process, each otch is overlapped, two corner cuts have been formed on the polymer battery core, these two corner cuts lay respectively at the both sides on polymer battery core top, make the drift angle of polymer battery core form round and smooth chamfering.As Fig. 2, shown in coiling after the plane graph of polymer battery core, at two drift angles of this polymer battery core, be not right angle, but level and smooth chamfering.
Wherein, the concrete shape of the corner cut on this polymer battery core can be set as required, in order to avoid in closedtop bending process, cause the damage of closedtop or the side seal of damage polymer battery core, can be by the circular arc corner cut of being arranged to have certain radius of the corner cut on this polymer battery core, the shape of corner cut 32 as shown in Figure 2.The arc corner cut there is certain radius in order to allow corner cut become, the otch on the anodal battery core pole piece that this polymer battery core is set and negative pole battery core pole piece, need to set the shape of this otch, and the needs of take guarantee that the corner cut of the overlapping rear formation of each otch is circular arc.
In addition, in actual applications, in the process that the polymer battery core is encapsulated, need to guarantee that the side seal of this polymer battery core and the corner cut on this polymer battery core fit, make the polymer battery core after encapsulation still present corner cut, and can guarantee before corner cut shape on the polymer battery core and encapsulation unchanged.Like this, after encapsulation finishes, the closedtop of this polymer battery core is bent downwards along the corner cut on this polymer battery core.
This closedtop also can be set according to actual needs to the bending degree on the top of polymer battery core, in order to reduce to greatest extent the shared height of this closedtop, closedtop can be bent at the place, top to described polymer battery core, until the plane at described closedtop place is perpendicular to the plane at described side seal place, now this plane, closedtop place is close to parallel with the plane, place, top of polymer battery core.As shown in Figure 2, closedtop can be folded into the plane perpendicular to the sidewall of the polymer battery core shown in Fig. 2 in same plane from the sidewall with described polymer battery core, in other words, this closedtop is folded into to the position of this closedtop perpendicular to paper from the position of the paper in Fig. 2.Like this, the shared height of this closedtop is only identical with the thickness of the material of this closedtop of preparation.
Consider that when sidewall to the polymer battery core is encapsulated, side seal need to wrap the sidewall of this polymer battery core fully, thereby make the width (represent width with horizontal direction in Fig. 2, vertical direction represents length and height) of side seal be greater than the width of this sidewall.Therefore, by closedtop during to the top bending of polymer battery core, may need to bend the part that exceeds sidewall in this side seal simultaneously, therefore, anodal battery core pole piece and the negative pole battery core pole piece other end offer some otch simultaneously, make two ends on anodal battery core pole piece and negative pole battery core pole piece be provided with otch.Each kerf of this positive pole battery core pole piece and negative pole battery core pole piece is all identical, and concrete can be with reference to shown in Fig. 3.Like this, polymer battery core top and the low side of anodal battery core pole piece and the formation of negative pole battery core pole piece coiling are all had to corner cut, all there is the corner cut of the circular arc with certain radius the top and bottom of polymer battery core as shown in Figure 3.
In addition, in the present invention, can also adopt flexible material to prepare described closedtop, like this, after the polymer battery core is encapsulated, also can be by this closedtop the top bending to this polymer battery core, until the vertical side seal with described polymer battery core of this closedtop.Certainly, the whole encapsulating film that whole polymer battery core is encapsulated can be flexible material and make, when the encapsulating film of this flexible material of employing is encapsulated the polymer battery core like this, top to the polymer battery core encapsulates the closedtop of formation for bending arbitrarily, also can bend arbitrarily and the two side of polymer battery core is encapsulated to the side seal formed, thereby avoided the phenomenon of closedtop or side seal closedtop being occurred damaging to a lateral buckling on the top near the polymer battery core.
On the top of the polymer battery core formed, positive pole and the negative pole of from described anodal battery core pole piece and negative pole battery core pole piece, drawing respectively, and described battery circuit board is connected with negative pole with described positive pole.In the positive pole on the connected mode of this cell circuit board and polymer battery core top and the connected mode of negative pole and existing lithium rechargeable battery, the connected mode of cell circuit board is identical.But the height shared due to the closedtop of this polymer battery core reduces, the distance between the plane, top of this cell circuit board and polymer battery core is obviously dwindled.
Certainly, lithium rechargeable battery in the present invention possesses glue shell upper cover, glue shell lower cover too, the necessary building block of the lithium ion batteries such as hot melt adhesive layer, the structure of these building blocks and annexation are similar to the connected mode of existing lithium rechargeable battery.
The higher energy force density that has for the lithium rechargeable battery that can embody more intuitively invention, referring to Fig. 4, show the composition structural representation of lithium rechargeable battery of the present invention, the total height of this lithium rechargeable battery is L in the present invention, the total height of polymer battery core is L1, the closedtop of this polymer battery core is to the sidewall bending of this polymer battery core, and this closedtop is perpendicular to the side seal layer, thereby making the shared height of this closedtop is L3, this height L3 is much smaller than the shared height L2 of closedtop of bending not in Fig. 1.The height shared due to this closedtop reduces, in this polymer battery core total height under certain prerequisite, make the shared space of core body of the polymer battery core formed by anodal battery core pole piece, negative pole battery core pole piece, barrier film and electrolyte in this polymer battery core increase, thereby increase to the space availability ratio of this polymer battery core, and then increased energy density and the capacity of this lithium rechargeable battery.
The present invention openly provides in a kind of lithium rechargeable battery, because the closedtop in the polymer battery core can be to place, the top plane bending of polymer battery core, thereby make the height of the shared polymer battery core of closedtop after bending obviously reduce, and then improved the space availability ratio of polymer battery core, and then energy density and the capacity of lithium rechargeable battery have been improved.
In addition, corresponding above lithium rechargeable battery, the present invention also provides a kind of method of making lithium rechargeable battery, and referring to Fig. 5, show a kind of schematic flow sheet of making an embodiment of method of lithium rechargeable battery of the present invention, the method for this enforcement comprises:
Step 501: prepare anodal battery core pole piece and negative pole battery core pole piece.
Before preparing the polymer battery core of lithium ion battery, need to prepare anodal battery core pole piece and negative pole battery core pole piece, the process for preparing the process of anodal battery core pole piece and negative pole battery core pole piece and the existing pole piece for preparing the polymer battery core is similar.
After selecting anodal battery core pole piece and negative pole battery core pole piece up to specification, just can carry out the follow-up polymer battery core for preparing, and then make the operation of lithium rechargeable battery.
Step 502: utilize the sidewall of described anodal battery core pole piece and described negative electrode chip structure polymer battery core, and between described anodal battery core pole piece and described negative pole battery core pole piece, barrier film is set.
Utilize described anodal battery core pole piece and negative pole battery core pole piece to prepare the core body of polymer battery core, in preparing the core body process of polymer battery core, between anodal battery core pole piece and negative pole battery core pole piece, barrier film is set.Barrier film plays buffer action, is mainly prevent between anodal battery core pole piece and negative pole battery core pole piece contacting and cause the problem of receiving part short circuit in lithium rechargeable battery.
When utilizing anodal battery core pole piece and negative pole battery core pole piece to prepare the core body of polymer battery core, the core body of this polymer battery core also is constructed out, top and the sidewall of this polymer battery core also form, the polymer battery core of the polymer battery core now formed for being encapsulated.
Step 503: the sidewall to described polymer battery core is encapsulated, and obtains the side seal of polymer battery core.
After completing steps 502 and step 503, prepared by the chief component of polymer battery core, needs afterwards the polymer battery core is encapsulated, and the sidewall of this polymer battery core is encapsulated, and forms side seal on polymer side walls.Closedtop can be understood as after being encapsulated of this polymer battery core, the encapsulation limit that encapsulating film forms on the two side of polymer battery core.
Step 504: the top to described polymer battery core encapsulates the formation closedtop.
Encapsulation to the polymer battery core also comprises that the top to the polymer battery core is encapsulated, and after completing the encapsulation of polymeric top, has just obtained closedtop.Closedtop can be understood as after being encapsulated of this polymer battery core, the encapsulation limit that encapsulating film forms on the top of polymer battery core.
This closedtop that this step obtains extends to the top away from the polymer battery core along the plane of the sidewall that is parallel to the polymer battery core, makes this closedtop take certain height (also can be called length), thereby makes the space availability ratio of polymer battery core reduce.
Step 505: the plane, place, top by closedtop to described polymer battery core is bent.
In order to reduce the shared space of closedtop in this polymer battery core, need to reduce the height (length) that this closedtop extends to the top of polymer battery core along the plane at sidewall place, the present embodiment is after preparing closedtop, also need the plane, place, top to the polymer battery core by this closedtop to be bent, to reduce the shared space of closedtop, and then improve the useful space utilance of polymer battery core.
Degree by from this closedtop to the top bending of polymer battery core can be arranged as required, in order to reduce to greatest extent the shared space of polymer battery core, can be by this closedtop the top bending to the polymer battery core, until the sidewall of this closedtop and polymer battery core is perpendicular.
Wherein, for fear of by this closedtop in the process of the plane bending at the place, top of polymer battery core, damage this closedtop, or damage the side seal of this polymer battery core, this closedtop can be made by flexible material.Further, when the encapsulation of the sidewall to the polymer battery core, side seal also can be made by flexible material.
Certainly, when preparing lithium rechargeable battery, also need to weld cell circuit board, this cell circuit board is welded on to the end of this polymer battery core near described closedtop.Concrete, on the top of described polymer battery core, positive pole and the negative pole of from described anodal battery core pole piece and negative pole battery core pole piece, drawing respectively, and described battery circuit board is connected with negative pole with described positive pole.
In addition, the polymer battery core also is provided with hot melt adhesive layer away from an end of described cell circuit board.This polymer battery core, cell circuit board and hot melt adhesive layer all are arranged in a battery case, and glue shell upper cover and glue shell glue shell are set respectively at the two ends of battery case, thereby obtain a complete lithium rechargeable battery.
When lithium rechargeable battery is encapsulated, the material of closedtop and side seal also can be identical with existing encapsulating material, but existing encapsulating material is not directly bending generally, in order to realize reducing the shared space of closedtop of this polymer battery core, referring to Fig. 6, show a kind of schematic flow sheet of making another embodiment of method of lithium rechargeable battery of the present invention, the present embodiment is the more detailed description scheme of a upper embodiment, and the method for the present embodiment comprises:
Step 601: prepare or anodal battery core pole piece and negative pole battery core pole piece be provided.
Step 602: offer some otch on the desired location of anodal battery core pole piece one end, on the setting position of negative pole battery core pole piece, offer with anodal battery core pole piece on the otch of equal number.
In the present embodiment, on anodal battery core pole piece He on negative pole battery core pole piece, some otch are set, the spacing between the quantity of otch and each otch can be set according to actual needs.
Kerf on negative pole battery core pole piece is identical with the kerf on anodal battery core pole piece, and negative pole battery core pole piece is identical with the position of offering otch on anodal battery core pole piece, be about to anodal battery core pole piece and negative pole battery core pole piece and overlap while stacking, the otch of the relevant position on anodal battery core pole piece and negative pole battery core pole piece is also overlapped.
Step 603: utilize anodal battery core pole piece and negative pole battery core pole piece with some otch to make the core body of polymer battery core, and between this positive pole battery core pole piece and negative pole battery core pole piece, barrier film is set.Wherein, offer the top of an end formation polymer battery core of otch on described anodal battery core pole piece and negative pole battery core pole piece.The top of this polymer battery core is the end near the cell circuit board in lithium rechargeable battery.
The process that utilization is made the polymer battery core with anodal battery core pole piece and the negative pole battery core pole piece of otch is specially: the otch on described anodal battery core pole piece and described negative electrode chip is overlapping, and reel described anodal battery core pole piece and described negative pole battery core piece structure polymer battery core, reel rear overlapping otch top and sidewall junction formation corner cut on the polymer battery core.
Step 604: the sidewall to described polymer battery core is encapsulated, and obtains side seal, and position and corner cut that the corner cut on described side seal and described polymer electric wire coincides fit.
Owing on anodal battery core pole piece, having otch, in the process that the sidewall of polymer battery core is encapsulated, the position and the corner cut that need to the corner cut on side seal and this polymer battery core coincide fit, and make the polymer battery core after encapsulation still keep former corner cut shape.
Wherein, the shape of this corner cut can be set as required, for the ease of follow-up, closedtop is bent, and this corner cut can be arranged to have the circular arc corner cut of certain radius.
Step 605: the top bending by closedtop along described corner cut to described polymer battery core.
Because the end near this closedtop on side seal has corner cut, therefore, can be by this closedtop the top bending along this corner cut to the polymer battery core, thereby avoid this closedtop in the bending process with the collision of side seal, or the pressure formed due to closedtop and side seal, and cause this closedtop or side seal to damage.
This closedtop can be set according to actual needs to the degree of the outer lateral buckling of polymer battery core.Optionally, in order to reduce to greatest extent the space of the shared polymer battery core of this closedtop, can be by this closedtop the top bending along described corner cut to the polymer battery core, until the plane at described closedtop place is perpendicular to the plane at the side seal place of polymer battery core.That is to say, the top bending by closedtop to the polymer battery core, until the plane at this closedtop place is mutually vertical with the plane at described side seal layer place.
Step 606: cell circuit board is welded on the positive pole and negative pole of drawing on described polymer battery core top.
Positive pole and negative pole that this cell circuit board and polymer battery core top are drawn weld together, and because reduce in the space that this closedtop is shared, thereby make the Distance Shortened between the plane, place, top of this cell circuit board and polymer battery core.
Step 607: choose a battery case, at an end of housing, lower glue cap is set, hot melt adhesive layer is set in housing.
Step 609: described battery case openend is arranged to the gluing cap, form the lithium rechargeable battery of sealing.
Step 606 is identical with the operating process of existing making lithium rechargeable battery to the process of step 608, can adopt existing any-mode to complete this polymer battery core and hot melt adhesive layer are arranged in battery case, and seal the operation of this battery case.
In addition, in the present invention before utilizing anodal battery core pole piece and negative pole battery core pole piece making polymer battery core, also can also offer some otch on the end away from battery circuit board at this negative pole battery core pole piece and anodal battery core pole piece, thereby the anodal battery core pole piece and the negative pole battery core pole piece that utilize two ends all to offer some otch are made the core body of polymer battery core, make the polymer battery core top and the bottom that are wound into all there is corner cut, thereby the closedtop of the polymer battery core after being more conducive to encapsulate is to close top plane bending.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part partly illustrates and gets final product referring to method.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (13)
1. a lithium rechargeable battery, comprise the polymer battery core, cell circuit board and battery case, wherein, described electrostrictive polymer in-core is equipped with anodal battery core pole piece, negative pole battery core pole piece and be arranged at the barrier film between described anodal battery core pole piece and negative pole battery core pole piece, described polymer battery core outer enclosure has encapsulating film, described encapsulating film comprises side seal and closedtop, described closedtop is arranged at described polymer battery core top, wherein, the top of described polymer battery core is the end near described battery circuit board, it is characterized in that, described closedtop can be to place, the top plane bending of described polymer battery core.
2. battery according to claim 1, is characterized in that, described anodal battery core pole piece offers some otch near an end of described closedtop;
Described negative pole battery core near an end of described closedtop offer with described anodal battery core pole piece on the otch of equal number;
Described anodal battery core pole piece and described negative pole battery core pole piece coiling form described polymer battery core, and the otch on described anodal battery core pole piece and the otch of described negative pole battery core pole piece are overlapped, described overlapped otch forms corner cut in top and the sidewall junction of polymer battery core;
Described closedtop can be along place, top plane bending from described corner cut to described polymer battery core.
3. battery according to claim 2, is characterized in that, described closedtop is to place, the top plane bending of described polymer battery core, and the plane at described closedtop place is perpendicular to plane, described side seal place.
4. battery according to claim 1, is characterized in that, described closedtop is that flexible material is made.
5. battery according to claim 1, is characterized in that, on the top of described polymer battery core, and positive pole and the negative pole of from described anodal battery core pole piece and negative pole battery core pole piece, drawing respectively, and described battery circuit board is connected with negative pole with described positive pole.
6. battery according to claim 2, is characterized in that, described corner cut is the circular arc corner cut with certain radius.
7. method according to claim 1, is characterized in that, described electrostrictive polymer in-core also comprises: electrolyte.
8. a method of making lithium rechargeable battery, is characterized in that, comprising:
Prepare anodal battery core pole piece and negative pole battery core pole piece;
Utilize described anodal battery core pole piece and described negative electrode chip structure polymer battery core, and between described anodal battery core pole piece and described negative pole battery core pole piece, barrier film is set;
Sidewall to described polymer battery core is encapsulated, and obtains side seal;
Top to described polymer battery core encapsulates the formation closedtop;
Place, top plane bending by from described closedtop to described polymer battery core.
9. method according to claim 8, is characterized in that, before utilizing the sidewall of described anodal battery core pole piece and described negative electrode chip structure polymer battery core, also comprises: at the desired location of described anodal battery core pole piece, offer some otch;
On the setting position of described negative pole battery core pole piece, offer with described anodal battery core pole piece on the otch of equal number;
While utilizing the sidewall of described anodal battery core pole piece and described negative electrode chip structure polymer battery core, otch on described anodal battery core pole piece and described negative electrode chip is overlapping, and reel described anodal battery core pole piece and described negative pole battery core piece structure polymer battery core, reel rear overlapping otch top and sidewall junction formation corner cut on the polymer battery core;
The described sidewall to described polymer battery core is encapsulated, and obtains side seal, comprising:
Sidewall to described polymer battery core is encapsulated, and obtains side seal, and the position and the described corner cut that at described side seal, in the corner cut with on described polymer battery core, overlap fit.
10. method according to claim 9, is characterized in that, described described closedtop is bent specifically and comprises to the plane, place, top of described polymer battery core:
Place, top plane bending by closedtop along from described corner cut to described polymer battery core.
11. method according to claim 10, is characterized in that, place, the top plane bending by described closedtop along described corner cut to described polymer battery core specifically comprises:
Place, top plane bending by described closedtop along from described corner cut to described polymer battery core, until the plane at described closedtop place is perpendicular to plane, described side seal place.
12. according to the described method of claim 9 to 11 any one, it is characterized in that, described corner cut is the circular arc corner cut with certain radius.
13. the described method of according to Claim 8 to 11 any one, is characterized in that, also comprises:
On the top of described polymer battery core, positive pole and the negative pole of from described anodal battery core pole piece and negative pole battery core pole piece, drawing respectively, and described battery circuit board is connected with negative pole with described positive pole.
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