CN107785606A - Battery and preparation method thereof - Google Patents
Battery and preparation method thereof Download PDFInfo
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- CN107785606A CN107785606A CN201710986486.4A CN201710986486A CN107785606A CN 107785606 A CN107785606 A CN 107785606A CN 201710986486 A CN201710986486 A CN 201710986486A CN 107785606 A CN107785606 A CN 107785606A
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- negative electrode
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 148
- 238000003466 welding Methods 0.000 claims description 31
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 3
- 238000010168 coupling process Methods 0.000 claims 3
- 238000005859 coupling reaction Methods 0.000 claims 3
- 238000005096 rolling process Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011883 electrode binding agent Substances 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
Classifications
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a battery and a preparation method thereof, relating to the technical field of batteries. The main technical scheme adopted is as follows: a battery comprises a winding core group, a connecting structure and a pole lug. Wherein, roll up core group including a plurality of book cores, and every rolls up core and includes anodal utmost point ear and negative pole utmost point ear. The connecting structure comprises a positive electrode connecting structure and a negative electrode connecting structure; the positive electrode connecting structure is connected with all positive electrode tabs in the winding core group; the negative electrode connecting structure is connected with all negative electrode tabs in the winding core group. The anode lug comprises an anode lug and a cathode lug; the positive pole lug is connected with the positive pole connecting structure; the negative pole lug is connected with the negative pole connecting structure. The invention is mainly used for providing the multi-roll core soft package battery with good rate capability, and the preparation method of the multi-roll core soft package battery is simple.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery and a preparation method thereof.
Background
At present, the battery core of the soft package lithium ion battery mainly adopts a winding structure. The winding type battery core has the advantages of simple operation, convenience for automatic production and high yield. Most wound cells are typically constructed from a single wound core. However, if a large-capacity battery is produced, the pole piece for manufacturing the winding core is longer, so that the difficulty of coating, manufacturing and winding is increased, and the production efficiency and the yield of the battery are influenced; and the pole piece is longer, the internal resistance of the battery can be increased, and the rate capability of the battery is reduced.
In order to reduce the internal resistance of the soft package lithium ion battery and improve the rate capability of the soft package lithium ion battery, the prior art mainly has the following schemes: the first scheme is to adopt the design of many utmost points ear to make soft packet of lithium ion battery (i.e. all set up a plurality of utmost points ear on the positive plate and the negative pole piece of each book core). The second scheme is to adopt a mode of connecting a plurality of winding cores in parallel.
However, the two solutions of the inventor of the present invention for reducing the internal resistance of the battery and improving the rate capability have at least the following problems: (1) for the first scheme, the design and manufacturing process of the multi-tab are complex. (2) For the second scheme, the rate performance and the safety performance of the multi-winding-core soft package battery are superior to those of a single-winding-core battery with the same thickness. Because the total thickness of the winding core group is thick, and the number of winding cores is large, the winding core pole ear is difficult to lead out, and the manufacturing difficulty of the multi-winding core soft package battery is improved.
Disclosure of Invention
In view of this, the invention provides a battery and a preparation method thereof, and mainly aims to provide a multi-roll core soft package battery with low manufacturing difficulty and good rate capability.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, embodiments of the present invention provide a battery, wherein the battery includes:
the winding core group comprises a plurality of winding cores, and each winding core comprises a positive electrode lug and a negative electrode lug;
a connection structure comprising a positive connection structure and a negative connection structure; the positive electrode connecting structure is connected with all positive electrode tabs in the winding core group; the negative electrode connecting structure is connected with all negative electrode tabs in the winding core group;
a positive tab comprising a positive electrode tab and a negative electrode tab; wherein the positive pole lug is connected with the positive pole connecting structure; the negative pole lug is connected with the second negative pole connecting structure.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, each winding core is formed by stacking and winding a positive plate, a diaphragm and a negative plate; wherein,
the positive plate comprises a positive current collector; the positive current collector has a first region and a second region; a positive electrode active paste is coated on the first region; the second area of the positive current collector is used as a positive electrode tab of the positive plate;
the negative plate comprises a negative current collector; the negative current collector has a first region and a second region; a negative electrode active slurry is coated on the first region of the negative electrode current collector; and the second area of the negative current collector is used as a negative electrode tab of the negative electrode plate.
Preferably, all the cores in the core group are stacked in parallel.
Preferably, the positive electrode connection structure includes a plurality of positive electrode connection tapes; the number of the positive connecting belts is consistent with that of the winding cores in the winding core group, and the positive connecting belts correspond to the winding cores one by one; wherein each positive connecting strap has a first portion and a second portion; the first part of each positive connecting belt is connected to the positive electrode tab of the corresponding winding core;
the negative electrode connecting structure comprises a plurality of negative electrode connecting belts, and the number of the negative electrode connecting belts is consistent with that of the winding cores in the winding core group and corresponds to that of the winding cores one by one; wherein each negative connecting strap has a first portion and a second portion; and the first part of each negative connecting belt is connected to the negative electrode tab of the corresponding winding core.
Preferably, the second part and the first part of each positive connecting belt are at a first set angle;
the second part and the first part of each negative connecting strip form a second set angle.
Preferably, the first set angle is 90 °; and/or the second set angle is 90 °.
Preferably, all of the second portions of the positive connecting strap are connected together; all of the second portions of the negative connecting strap are connected together.
Preferably, all of the second portions of the positive electrode connection tape are connected in a stacked manner; all the second parts of the negative connecting strap are connected in a stacked manner.
Preferably, one positive connecting band in the positive connecting structure is a first positive connecting band, and the rest positive connecting bands are second positive connecting bands; the second part of the first positive connecting belt is positioned on one side of the positive connecting structure far away from the winding core group; the positive pole lug is connected with the first positive connecting band;
one negative connecting band in the negative connecting structure is a first negative connecting band, and the other negative connecting bands are second negative connecting bands; wherein the second part of the first negative connecting strap is positioned on one side of the negative connecting structure far away from the winding core group; the negative pole lug is connected with the first negative pole connecting band.
Preferably, the positive electrode connecting structure and the positive electrode tab are connected by welding; the negative electrode connecting structure and the negative electrode lug are connected in a welding mode; and/or
The positive pole lug is connected with the positive pole connecting structure in a welding mode; the negative pole piece and the negative pole connecting structure are connected in a welding mode.
Preferably, a tab film is arranged on the positive tab piece, and a tab film is arranged on the negative tab piece.
Preferably, the positive tab has a first portion and a second portion; wherein the first part of the positive pole lug is connected with the positive pole connecting structure, and the tab film is arranged on the second part of the positive pole lug;
the negative electrode tab has a first portion and a second portion; the first part of the negative electrode lug is connected with the negative electrode connecting structure, and the tab film is arranged on the second part of the negative electrode lug.
Preferably, the first and second portions of the positive tab are perpendicular; the first portion and the second portion of the negative pole tab are perpendicular.
Preferably, the positive connecting belt is made of aluminum; the negative connecting belt is made of nickel; and/or the positive pole lug is made of aluminum; the negative electrode lug is made of any one of copper, nickel or nickel-plated copper.
Preferably, the positive pole tab of each winding core is located at one end of the winding core, and the negative pole tab of each winding core is located at the other end of the winding core.
Preferably, the positive electrode tab is located at the middle position of the positive end of the winding core group, and the negative electrode tab is located at the middle position of the negative end of the winding core group.
In another aspect, an embodiment of the present invention provides a method for preparing a battery according to any one of the above methods, including the steps of:
preparing a winding core group; each winding core group comprises a plurality of winding cores, and each winding core comprises a positive electrode lug and a negative electrode lug;
connecting the positive pole lug with the positive pole connecting structure, and connecting the negative pole lug with the negative pole connecting structure;
connecting a positive electrode connecting structure with a positive electrode lug of the winding core group, and connecting a negative electrode connecting structure with a negative electrode lug of the winding core group;
and packaging the winding core group by using an aluminum plastic film.
Preferably, the step of preparing the winding core set includes:
preparing a positive plate and a negative plate;
winding the positive plate, the diaphragm and the negative plate into a winding core;
and welding a plurality of winding cores in parallel to form a winding core group.
Preferably, the material of the diaphragm is a high molecular polymer; or
The separator includes a first layer and a second layer; wherein the first layer is a high molecular polymer layer; the second layer is a ceramic material layer or a bonding coat coated on the first layer.
Preferably, in the step of winding the positive electrode sheet, the separator and the negative electrode sheet into a roll core,
the diaphragm completely covers the first area on the positive plate and the first area on the negative plate.
Preferably, the step of connecting the positive electrode tab and the positive electrode connecting structure and the step of connecting the negative electrode tab and the negative electrode connecting structure specifically include:
connecting the positive pole lug with a first positive pole connecting belt in the positive pole connecting structure;
and connecting the negative pole lug with a first negative connecting band in the negative pole connecting structure.
Preferably, the step of connecting the positive electrode connection structure with the positive electrode tab of the winding core group and the step of connecting the negative electrode connection structure with the negative electrode tab of the winding core group comprises:
connecting first parts of all the positive connecting bands in the positive connecting structure to positive lugs of the corresponding winding cores, and connecting second parts of all the positive connecting bands in the positive connecting structure together; the first part and the second part of the positive connecting belt form a first set angle;
connecting the first parts of all the negative connecting belts in the negative connecting structure to the negative pole lugs of the corresponding winding cores, and connecting the second parts of all the negative connecting belts in the negative connecting structure together; and the first part and the second part of the negative connecting belt form a second set angle.
Compared with the prior art, the battery and the preparation method thereof have the following beneficial effects:
the battery provided by the embodiment of the invention comprises a plurality of winding cores, so that the multiplying power performance of the battery is excellent, in addition, the connection of all the positive pole lugs in the winding core group is realized by adopting the positive pole connecting structure, the connection of all the negative pole lugs in the winding core group is realized by adopting the negative pole connecting structure, and finally, the connection of the positive pole lugs and the negative pole lugs in the winding core group is realized by connecting the positive pole lugs and the positive pole connecting structure and connecting the negative pole lugs and the negative pole connecting structure respectively. Therefore, the design mode overcomes the technical problems that the positive and negative electrode lugs of the multi-roll core battery are not easy to weld and difficult to lead out in the prior art, and the manufacturing process of the multi-roll core battery is easier to realize.
Furthermore, according to the embodiment of the invention, the positive connecting belt is welded on the positive electrode tab of each winding core, the negative connecting belt is welded on the negative electrode tab of each winding core, and finally the plurality of positive connecting belts are connected and the plurality of negative connecting belts are connected.
Further, the present embodiment is achieved by making the second part and the first part of each positive electrode connection tape 90 °; the second portion and the first portion of each negative connecting strap are at 90 deg.). Preferably, the first set angle is 90 °; the second set angle is 90 °. The arrangement can reduce the space in the height direction of the battery occupied by the anode connection structure and the cathode connection structure, so that the space of the battery is fully utilized, and the volume energy density of the battery is improved.
Further, the embodiment of the present invention is implemented by making all the first portions of the positive electrode connection tape parallel to each other; all of the first portions of the negative connecting strap are parallel to each other. All the second parts of the positive connecting belts are connected in a laminated manner; all the second portions of the negative connecting strap are connected in a stacked manner. Here, by providing such a configuration, the space utilization of the battery is further made sufficient, and the volumetric energy density of the battery is improved.
Further, the embodiment of the invention ensures that the tab glue on the positive tab has a proper distance with the welding position of the positive tab and the positive connecting structure and the tab glue on the negative tab has a proper distance with the welding position of the negative tab and the negative connecting structure, so as to ensure the packaging of the tab and the aluminum plastic film.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a partial schematic view of the internal structure of a battery provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an appearance of a battery according to an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Example 1
The present embodiment provides a battery, as shown in fig. 1 and fig. 2, the battery 1 in the present embodiment includes a winding core set, a connection structure, and a pole tab. Wherein, roll up core group including a plurality of book cores 11, and every rolls up core 11 and has anodal utmost point ear and negative pole utmost point ear. The connection structure includes a positive electrode connection structure 12 and a negative electrode connection structure (not shown); wherein, the positive electrode connecting structure 12 is connected with all positive electrode tabs of the winding core group; the negative electrode connecting structure is connected with all negative electrode tabs of the winding core group. The anode tabs comprise an anode tab 13 and a cathode tab 15; wherein, the positive pole lug 13 is connected with the positive pole connecting structure 12; the negative pole lug 15 is connected with the negative pole connecting structure.
The battery that this embodiment provided includes a plurality of book cores for the multiplying power performance of battery is excellent, and, this embodiment realizes will rolling up the connection of all anodal utmost point ears in the core group through adopting anodal connection structure 12, realize will rolling up the connection of all negative pole utmost point ears in the core group through negative pole connection structure, rethread anodal auricle 13 and anodal connection structure's being connected, negative pole auricle and negative pole connection structure's being connected, the anodal utmost point ear in the core group will be rolled up in final realization, negative pole utmost point ear is connected respectively. Therefore, the design mode overcomes the technical problems that the positive and negative electrode lugs of the multi-roll core battery are not easy to weld and difficult to lead out in the prior art, and the manufacturing process of the multi-roll core battery is easier to realize.
The batteries in this and the following examples are primarily lithium pouch batteries.
Preferably, all the cores 11 in the core group are stacked in parallel.
Each winding core 11 is formed by stacking and winding a positive plate, a diaphragm and a negative plate; wherein, the positive plate comprises a positive current collector; the positive electrode current collector has a first region and a second region; the positive active slurry is coated on the first region; the second area of the positive current collector is used as a positive pole tab of the positive pole piece. The negative plate comprises a negative current collector; the negative electrode current collector has a first region and a second region; coating the negative active slurry on a first region of a negative current collector; the second area of the negative current collector serves as a negative tab of the negative plate. The positive electrode active paste herein includes a positive electrode active material, a binder, and a conductive agent and a positive electrode additive. The negative active slurry comprises a negative active material, a binder, a conductive agent and a negative additive.
Preferably, the design of the utmost point ear on every book core 11 in this embodiment is full utmost point ear design, namely, the positive pole utmost point ear of every book core 11 is located the one end of rolling up core 11, and the negative pole utmost point ear of every book core 11 is located the other end of rolling up the core.
Preferably, the above-mentioned specific manner of "connecting" in this embodiment is welding, and more preferably ultrasonic welding. For example, the positive electrode connection structure 12 and the positive electrode tab are connected by welding; the connection mode of the negative electrode connection structure and the negative electrode lug is welding. The positive pole lug 13 and the positive pole connecting structure 12 are connected in a welding mode; the connection mode of the negative pole piece and the negative pole connecting structure is welding.
Example 2
Preferably, the present embodiment provides a battery, compared to the previous embodiment, as shown in fig. 1, the present embodiment is further designed as follows:
the positive electrode connecting structure 12 in this embodiment includes a plurality of positive electrode connecting strips, and the number of the positive electrode connecting strips is consistent with the number of the winding cores 11 in the winding core group and corresponds to one another; wherein each positive connecting strap has a first portion and a second portion; and the first part of each positive connecting belt is connected to the positive electrode tab of the corresponding winding core. Similarly, the negative electrode connecting structure comprises a plurality of negative electrode connecting belts, and the number of the negative electrode connecting belts is consistent with that of the winding cores in the winding core group and corresponds to one another; wherein each negative connecting strap has a first portion and a second portion; and the first part of each negative connecting belt is connected to the negative electrode tab of the corresponding winding core. The positive connecting belt is welded on the positive electrode lug of each winding core, the negative connecting belt is welded on the negative electrode lug of each winding core, and finally the plurality of positive connecting belts are connected and the plurality of negative connecting belts are connected.
Preferably, the second portion and the first portion of each positive connecting strap are at a first set angle (preferably 80-100 °); the second portion and the first portion of each negative connecting strap are at a second set angle (preferably 80-100 °). Preferably, the first set angle is 90 °; the second set angle is 90 °. The arrangement can reduce the space in the height direction of the battery occupied by the anode connection structure and the cathode connection structure, so that the space of the battery is fully utilized, and the volume energy density of the battery is improved.
Preferably, all of the first portions of the positive connecting strap are parallel to each other; all of the first portions of the negative connecting strap are parallel to each other. All the second parts of the positive connecting belts are connected in a laminated manner; all the second portions of the negative connecting strap are connected in a stacked manner. The arrangement makes the space of the battery fully utilized, and the volumetric energy density of the battery is improved.
Preferably, the width of the positive connecting band (or the negative connecting band) is 1.0 to 1.3 times of the width of the positive lug (or the negative lug); the connection of the pole lug and the connection structure is convenient to realize by the arrangement, and the performance of the battery can be improved.
The battery that this embodiment provided can reduce the space that connection structure occupy the battery direction of height through carrying out above-mentioned design to connection structure for the space utilization of battery is abundant, improves battery volume energy density.
Example 3
Preferably, the present embodiment provides a battery, compared to the previous embodiment, as shown in fig. 1, the present embodiment is further designed as follows:
in this embodiment, one positive connecting strap in the positive connecting structure 12 is a first positive connecting strap, and the rest positive connecting straps are second positive connecting straps; when the second parts of all the positive connecting belts are connected in a stacked mode, the second parts of the first positive connecting belts are located on the side, far away from the winding core group, of the positive connecting structure. The positive electrode tab 13 is connected (preferably welded, more preferably ultrasonically welded) to the first positive electrode connection tape. One negative connecting band in the negative connecting structure is a first negative connecting band, and the other negative connecting bands are second negative connecting bands; when the second parts of all the negative electrode connection tapes are connected in a stacked manner, the second part of the first negative electrode connection tape is positioned on the side of the negative electrode connection structure far away from the winding core group. The negative electrode tab 13 is connected (preferably welded, more preferably ultrasonically welded) to the first negative connection tape. Preferably, the welding height of the positive electrode tab 13 on the positive electrode connecting structure 12 ensures that the positive electrode tab 13 is located at a distance of one half of the thickness of the whole stacked winding core assembly, and the welding height of the negative electrode tab on the negative electrode connecting structure ensures that the negative electrode tab is located at a distance of one half of the thickness of the whole stacked winding core assembly.
Preferably, the positive electrode tab 13 is provided with a tab film 14, and preferably, the tab film 14 includes an upper tab film and a lower tab film. The upper lug film is arranged on the upper surface of the positive lug, the lower lug film is arranged on the lower surface of the positive lug, and the upper lug film and the lower lug film correspond up and down. Similarly, a tab film is arranged on the negative electrode tab, and the tab film on the negative electrode tab is designed in a manner of referring to the tab film on the positive electrode tab.
Here, the tab films of the positive electrode tab 13 and the negative electrode tab are mainly used to encapsulate the winding core group in the aluminum plastic film, and after encapsulation, a part of the positive electrode tab 13 and the negative electrode tab is exposed outside the aluminum plastic film (see fig. 1 and 2).
Preferably, the positive tab 13 has a first portion and a second portion; wherein the first portion is connected to the positive electrode connecting structure 12 and the tab film 14 is disposed on the second portion (preferably, on the side of the second portion adjacent to the winding core). The negative electrode tab has a first portion and a second portion; wherein the first part is connected with the negative electrode connecting structure, and the tab film is arranged on the second part (preferably, on the side of the second part close to the winding core). The first and second portions of the positive tab 13 are perpendicular; the first portion and the second portion of the negative electrode tab are perpendicular. Here, through setting up like this, can ensure that there is suitable distance between the welding point of utmost point ear piece and anodal auricle (anodal auricle and anodal connection structure's welding point), have suitable distance between the welding point of utmost point ear piece and negative pole auricle (anodal auricle and negative connection structure's welding point) to guarantee the encapsulation of utmost point auricle and plastic-aluminum membrane.
Preferably, the positive connecting strap in the above embodiment is made of aluminum, and the thickness is between 0.1mm and 0.3 mm. The negative connecting belt is made of nickel and has a thickness of 0.1-0.3 mm. The positive electrode lug is made of aluminum; the negative electrode lug is made of any one of nickel, copper or nickel-plated copper. Preferably, the positive electrode tab, the negative electrode tab, the positive connecting band and the negative connecting band have the same thickness and width. Preferably, the thickness of the winding core set is between 20 and 40 mm.
Preferably, the positive electrode tab is positioned in the middle of the positive electrode end of the winding core group, and the negative electrode tab is positioned in the middle of the negative electrode end of the winding core group; by the arrangement, the winding core group is convenient to encapsulate.
Example 4
Preferably, this embodiment provides a method for preparing the battery of any of the above embodiments, including the following steps:
first, a winding core set is prepared.
As shown in fig. 1 and 2, the winding core group includes a plurality of winding cores 11, and each winding core 11 is provided with a positive electrode tab and a negative electrode tab.
Preferably, the steps specifically include the following:
1) and preparing a positive plate and a negative plate.
Preparing a positive electrode active material, a positive electrode binder, a conductive agent and a positive electrode additive into uniform slurry according to a certain proportion, uniformly coating the slurry on a first area on the surface of a positive electrode current collector, and taking a second area on the surface of the positive electrode current collector, which is not coated with the positive electrode active slurry, as a positive electrode tab to obtain a positive electrode plate. Preferably, the area of the first region of the surface of the positive current collector is 9 to 11 times the area of the second region.
Preparing a uniform slurry from a negative electrode active material, a negative electrode binder, a conductive agent and a negative electrode additive according to a certain proportion, and then uniformly coating the slurry on a first area on the surface of a negative electrode current collector to enable a second area on the surface of the negative electrode current collector, which is not coated with the negative electrode active slurry, to be a negative electrode tab to obtain a negative electrode plate. Preferably, the area of the first region of the surface of the negative current collector is 9 to 11 times the area of the second region.
And a tab film is arranged on the positive tab piece, and a tab film is arranged on the negative tab piece.
2) And winding the positive plate, the diaphragm and the negative plate into a winding core.
In this step, the separator completely encases the active material coated area on the negative plate, and the negative plate completely encases the active material coated area on the positive plate.
In the step, the material of the diaphragm is high molecular polymer; or the separator comprises a first layer and a second layer; wherein the first layer is a high molecular polymer layer; the second layer is a ceramic material layer or a bonding coat coated on the first layer. Preferably, the thickness of the separator is 10 to 30 μm.
3) And welding a plurality of winding cores in parallel to form a winding core group.
And secondly, connecting the positive pole lug with the positive pole connecting structure and connecting the negative pole lug with the negative pole connecting structure. The specific connection is described in example 3 and fig. 1.
And thirdly, connecting the positive electrode connecting structure with a positive electrode lug of the winding core group, and connecting the negative electrode connecting structure with a negative electrode lug of the winding core group.
In the step, the first parts of all the positive connecting belts in the positive connecting structure are connected to the positive electrode tabs of the corresponding winding cores, and the second parts of all the positive connecting belts in the positive connecting structure are connected together; the first part and the second part of the positive connecting belt form a first set angle; connecting the first parts of all the negative connecting belts in the negative connecting structure to the negative pole lugs of the corresponding winding cores, and connecting the second parts of all the negative connecting belts in the negative connecting structure together; and the first part and the second part of the negative connecting belt form a second set angle. The specific connection is described in example 2 and fig. 1.
And fourthly, finally, packaging, baking, injecting liquid, baking by a clamp, forming and grading the welded large winding core by adopting the aluminum-plastic film with the punched shell to obtain the battery.
Example 5
In this embodiment, a 24mm thick 4-core lithium-ion battery with a soft package core is specifically prepared according to the preparation method described in embodiment 4. The method comprises the following specific steps: firstly, respectively preparing a positive plate and a negative plate with full lugs; then obtain 4 core that thickness is 6mm after coiling the positive plate of full utmost point ear, 16 mu m diaphragm, the negative pole piece of full utmost point ear, mark respectively and roll up core, third core and the fourth core of rolling up as first core, second core, the third of rolling up to the position of each core is respectively: the first winding core is located at the lowest part of the winding core group shown in fig. 1 and is stacked in sequence, and the fourth winding core is located at the uppermost part of the winding core group shown in fig. 1. A positive electrode aluminum connecting band and a negative electrode copper connecting band which are pre-folded with the width of 30mm and the thickness of 0.1mm are respectively taken (pre-folding refers to that a first part and a second part of the positive electrode aluminum connecting band are vertical and a first part and a second part of the negative electrode copper connecting band are vertical) and a pre-folded positive electrode lug piece and a pre-folded negative electrode lug piece (pre-folding refers to that a first part and a second part of the positive electrode lug piece are vertical and a first part and a second part of the negative electrode lug piece are vertical). Respectively welding the pre-folded anode lug sheet and the pre-folded cathode lug sheet on an anode aluminum connecting belt and a cathode copper connecting belt which are used for being connected with the first winding core by adopting an ultrasonic welding machine; wherein, the welding position of positive and negative pole utmost point ear is located the height that the distance is upwards 2 book core thickness from first book core lower bottom on the connecting band. And then welding the aluminum connecting band and the copper connecting band of the lug with the pole with the positive pole and the negative pole of the first winding core respectively, and then folding the two at right angles upwards. And then an ultrasonic welding machine is adopted to weld the positive connecting belt and the negative connecting belt on the positive electrode lug and the negative electrode lug of the second roll core, the third roll core and the fourth roll core respectively, and the positive electrode connecting belt and the negative electrode connecting belt are bent upwards at a right angle. And welding the connecting belt of the first winding core, the second winding core, the third winding core and the fourth winding core together at a position of 1-5mm after the fourth winding core is bent at a right angle. And finally, packaging, baking, injecting liquid, baking by a clamp, forming, grading and the like the welded large winding core by adopting the aluminum-plastic film with the punched shell to obtain the 4-winding-core soft package battery.
To sum up, according to the battery and the manufacturing method thereof provided by the embodiment of the invention, the connection of all the positive electrode tabs in the winding core group is realized by adopting the positive electrode connection structure, the connection of all the negative electrode tabs in the winding core group is realized by adopting the negative electrode connection structure, and finally, the connection of the positive electrode tabs and the positive electrode connection structure and the connection of the negative electrode tabs and the negative electrode connection structure are realized, so that the positive electrode tabs and the negative electrode tabs in the winding core group are realized. Therefore, the design mode overcomes the technical problems that the positive and negative electrode lugs of the multi-roll core battery are not easy to weld and difficult to lead out in the prior art, and the manufacturing process of the multi-roll core battery is easier to realize.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (23)
1. A battery, comprising:
the winding core group comprises a plurality of winding cores, and each winding core comprises a positive electrode lug and a negative electrode lug;
a connection structure comprising a positive connection structure and a negative connection structure; the positive electrode connecting structure is connected with all positive electrode tabs in the winding core group; the negative electrode connecting structure is connected with all negative electrode tabs in the winding core group;
a positive tab comprising a positive electrode tab and a negative electrode tab; wherein the positive pole lug is connected with the positive pole connecting structure; the negative pole lug is connected with the negative pole connecting structure.
2. The battery according to claim 1, wherein each winding core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet; wherein,
the positive plate comprises a positive current collector; the positive current collector has a first region and a second region; a positive electrode active paste is coated on the first region; the second area of the positive current collector is used as a positive electrode tab of the positive plate;
the negative plate comprises a negative current collector; the negative current collector has a first region and a second region; a negative electrode active slurry is coated on the first region of the negative electrode current collector; and the second area of the negative current collector is used as a negative electrode tab of the negative electrode plate.
3. The battery of claim 1, wherein all of the winding cores in the set of winding cores are stacked in parallel.
4. The battery of any of claims 1-3, wherein the positive connection structure comprises a plurality of positive connection straps; the number of the positive connecting belts is consistent with that of the winding cores in the winding core group, and the positive connecting belts correspond to the winding cores one by one; wherein each positive connecting strap has a first portion and a second portion; the first part of each positive connecting belt is connected to the positive electrode tab of the corresponding winding core;
the negative electrode connecting structure comprises a plurality of negative electrode connecting belts, and the number of the negative electrode connecting belts is consistent with that of the winding cores in the winding core group and corresponds to that of the winding cores one by one; wherein each negative connecting strap has a first portion and a second portion; and the first part of each negative connecting belt is connected to the negative electrode tab of the corresponding winding core.
5. The battery according to claim 4,
the second part and the first part of each positive connecting belt form a first set angle;
the second part and the first part of each negative connecting strip form a second set angle.
6. The battery according to claim 5, wherein the first set angle is 90 °; and/or the second set angle is 90 °.
7. The battery of claim 4, wherein all of the second portions of the positive connecting straps are connected together; all of the second portions of the negative connecting strap are connected together.
8. The battery of claim 4, wherein all of the second portions of the positive connecting straps are connected in a stacked configuration; all the second parts of the negative connecting strap are connected in a stacked manner.
9. The battery of claim 4, wherein all of the first portions of the positive connection strap are parallel to each other and all of the first portions of the negative connection strap are parallel to each other.
10. The battery of any of claims 4-9, wherein one of the positive connection structures is a first positive connection strap and the remaining positive connection straps are second positive connection straps; the second part of the first positive connecting belt is positioned on one side of the positive connecting structure far away from the winding core group; the positive pole lug is connected with the first positive connecting band;
one negative connecting band in the negative connecting structure is a first negative connecting band, and the other negative connecting bands are second negative connecting bands; wherein the second part of the first negative connecting strap is positioned on one side of the negative connecting structure far away from the winding core group; the negative pole lug is connected with the first negative pole connecting band.
11. The battery of any of claims 1-10, wherein the positive connection structure is connected to the positive tab by welding; the negative electrode connecting structure and the negative electrode lug are connected in a welding mode; and/or
The positive pole lug is connected with the positive pole connecting structure in a welding mode; the negative pole piece and the negative pole connecting structure are connected in a welding mode.
12. The battery according to any one of claims 1 to 10, wherein a tab film is provided on the positive electrode tab, and a tab film is provided on the negative electrode tab.
13. The battery of claim 12, wherein the positive tab has a first portion and a second portion; wherein the first part of the positive pole lug is connected with the positive pole connecting structure, and the tab film is arranged on the second part of the positive pole lug;
the negative electrode tab has a first portion and a second portion; the first part of the negative electrode lug is connected with the negative electrode connecting structure, and the tab film is arranged on the second part of the negative electrode lug.
14. The battery of claim 13, wherein the first and second portions of the positive tab are perpendicular; the first portion and the second portion of the negative pole tab are perpendicular.
15. The battery of claim 4, wherein the positive connecting strap is made of aluminum; the negative connecting belt is made of nickel; and/or
The positive electrode lug is made of aluminum; the negative electrode lug is made of any one of copper, nickel or nickel-plated copper.
16. The battery of claim 1, wherein the positive tab of each jellyroll is located at one end of the jellyroll and the negative tab of each jellyroll is located at the other end of the jellyroll.
17. The battery of claim 1, wherein the positive tab is located at an intermediate position of the positive end of the winding core group and the negative tab is located at an intermediate position of the negative end of the winding core group.
18. A method for preparing a battery according to any one of claims 1 to 17, comprising the steps of:
preparing a winding core group; each winding core group comprises a plurality of winding cores, and each winding core comprises a positive electrode lug and a negative electrode lug;
connecting the positive pole lug with the positive pole connecting structure, and connecting the negative pole lug with the negative pole connecting structure;
connecting a positive electrode connecting structure with a positive electrode lug of the winding core group, and connecting a negative electrode connecting structure with a negative electrode lug of the winding core group;
and packaging the winding core group by using an aluminum plastic film.
19. The method for manufacturing a battery according to claim 18, wherein the step of manufacturing the winding core set includes:
preparing a positive plate and a negative plate;
winding the positive plate, the diaphragm and the negative plate into a winding core;
and welding a plurality of winding cores in parallel to form a winding core group.
20. The method for manufacturing a battery according to claim 19, wherein the separator is made of a high molecular polymer; or
The separator includes a first layer and a second layer; wherein the first layer is a high molecular polymer layer; the second layer is a ceramic material layer or a bonding coat coated on the first layer.
21. The method according to claim 19, wherein in the step of winding the positive electrode sheet, separator and negative electrode sheet into a roll core,
the diaphragm completely encloses the first region on the positive plate and the first region on the negative plate.
22. The method for preparing a battery according to claim 18, wherein the step of connecting the positive electrode tab with the positive electrode connecting structure and the step of connecting the negative electrode tab with the negative electrode connecting structure comprises:
connecting the positive pole lug with a first positive pole connecting belt in the positive pole connecting structure;
and connecting the negative pole lug with a first negative connecting band in the negative pole connecting structure.
23. The method for manufacturing a battery according to claim 18, wherein the step of coupling the positive electrode coupling structure to the positive electrode tab of the winding core set and the negative electrode coupling structure to the negative electrode tab of the winding core set comprises:
connecting first parts of all the positive connecting bands in the positive connecting structure to positive lugs of the corresponding winding cores, and connecting second parts of all the positive connecting bands in the positive connecting structure together; the first part and the second part of the positive connecting belt form a first set angle;
connecting the first parts of all the negative connecting belts in the negative connecting structure to the negative pole lugs of the corresponding winding cores, and connecting the second parts of all the negative connecting belts in the negative connecting structure together; and the first part and the second part of the negative connecting belt form a second set angle.
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Application publication date: 20180309 |