CN115064781B - Composite core package for battery core, battery core and battery module - Google Patents
Composite core package for battery core, battery core and battery module Download PDFInfo
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- CN115064781B CN115064781B CN202210557274.5A CN202210557274A CN115064781B CN 115064781 B CN115064781 B CN 115064781B CN 202210557274 A CN202210557274 A CN 202210557274A CN 115064781 B CN115064781 B CN 115064781B
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- 238000005452 bending Methods 0.000 claims abstract description 49
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- 238000005253 cladding Methods 0.000 claims description 19
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
-
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/005—Devices for making primary cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/42—Grouping of primary cells into 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The invention belongs to the technical field of new energy, and discloses a composite core package for a battery core, the battery core and a battery module. The composite core package comprises: the two core packages with the same structure are both snakelike and are provided with a plurality of bending sections, a plurality of straight sections, a plurality of positive lugs and a plurality of negative lugs, and the positive lugs and the negative lugs are mutually staggered to form two sides of the core packages; any second bending section of the second core packet crosses the first straight section of the first core packet in the length extension direction of the first core packet, and a first straight section is arranged between two adjacent second straight sections in the second core packet in a stacking mode; any first bending section of the first core bag spans the second straight section in the length extension direction of the second core bag, and a second straight section is overlapped between two adjacent first straight sections. The battery core comprises the composite core package. The battery module comprises the battery core. Through the technical scheme, the battery cell has high space utilization rate, high volume energy density and high assembly efficiency.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to a composite core package for a battery core, the battery core and a battery module.
Background
The battery core is divided according to the process of assembling the anode, the cathode and the diaphragm, and can be divided into a winding process and a lamination process. The winding process comprises the following steps: coating the positive electrode and the negative electrode on two sides, stacking the positive electrode, the diaphragm and the negative electrode into strips in sequence, and then rolling the strips. The lamination process is as follows: after the positive electrode and the negative electrode are cut, the diaphragm, the positive electrode, the diaphragm and the negative electrode are taken as repeated units to be stacked into a plurality of layers, wherein each layer of diaphragm is connected in a Z shape.
In the manufacturing process according to the winding process, the following problems were found to exist: the space utilization rate of the electric core design shell is low, the volume energy density is low, the resistance caused by inconsistent distance from the lug to each position of the pole piece is inconsistent, and the inner ring of the winding core has a wrinkle phenomenon. During the production according to the lamination process, the following problems were found to exist: the process has low production efficiency.
Disclosure of Invention
In order to solve the above problems, an aspect of the present invention provides a composite core package for a battery cell, including: the first core bag is in a snake shape and is provided with a plurality of first bending sections, a plurality of first straight sections, a plurality of first positive lugs and a plurality of first negative lugs, two end parts of any one first bending section are respectively connected with one end parts of two adjacent first straight sections, and the first positive lugs and the first negative lugs are formed on two sides of the first core bag in a mutually staggered manner along the length extending direction of the first core bag; the second core packet has the same structure as the first core packet and is provided with a plurality of second bending sections, a plurality of second straight sections, a plurality of second positive lugs and a plurality of second negative lugs; any one second bending section transversely spans the first straight section in the length extension direction of the first core bag, and one first straight section is arranged between two adjacent second straight sections in a stacked mode; any first bending section transversely spans the second straight section in the length extension direction of the second core bag, and one second straight section is overlapped between two adjacent first straight sections.
In the composite core package as described above, optionally, the first positive tab and the first negative tab that are adjacent are respectively disposed on two first bending sections that are adjacent; the adjacent second positive tab and the second negative tab are respectively arranged on the two adjacent second bending sections; the second straight section and the first straight section are arranged in a cross manner.
In the composite core package as described above, optionally, the distances between any two adjacent first positive electrode tabs and first negative electrode tabs are equal; and the distance between any two adjacent second positive electrode tabs and second negative electrode tabs is equal.
In the composite core package as described above, optionally, along the length extension direction of the first core package, the first positive tab and the second positive tab are both disposed on one side of the first core package, and the first negative tab and the second negative tab are both disposed on the other side of the first core package.
In the composite core package as described above, optionally, the first bend section is an arc section; the second bending section is an arc section.
In the composite core package as described above, optionally, the first core package comprises: the core pack comprises a plurality of first core pack monomers which are stacked, wherein the first core pack monomers are of a laminated structure formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm and a first negative electrode in sequence, and the first porous diaphragm opposite to the first negative electrode is stacked on the outer side of the first core pack monomers which are stacked; the second core pack includes: the second core pack comprises a plurality of stacked second core pack monomers, wherein the second core pack monomers are of a laminated structure formed by stacking a second porous diaphragm, a second positive electrode, a second porous diaphragm and a second negative electrode in sequence, a non-porous diaphragm opposite to the second negative electrode is stacked on one side of the plurality of stacked second core pack monomers, and a non-porous diaphragm opposite to the second positive electrode is stacked on the other side of the plurality of stacked second core pack monomers and used for replacing a second empty diaphragm stacked with the second positive electrode.
In the composite core package as described above, optionally, the first core package comprises: the core pack comprises a plurality of first core pack monomers which are stacked, wherein each first core pack monomer is of a laminated structure formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm, a first negative electrode, a first porous diaphragm, a first positive electrode and a first porous diaphragm in sequence; the second core pack includes: the second core cladding units are stacked, and each second core cladding unit is of a laminated structure formed by stacking a second porous diaphragm, a second negative electrode, a second porous diaphragm, a second positive electrode, a second porous diaphragm, a second negative electrode and a second porous diaphragm in sequence.
In the composite core package as described above, optionally, the first core package comprises: the core pack comprises a plurality of first core pack monomers which are stacked, wherein each first core pack monomer is of a laminated structure formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm, a first negative electrode, a first porous diaphragm, a first positive electrode and a first porous diaphragm in sequence; the second core pack includes: the second core cladding units are stacked, each second core cladding unit is of a laminated structure formed by stacking a second porous diaphragm, a second negative electrode, a second porous diaphragm, a second positive electrode, a second porous diaphragm, a second negative electrode and a second porous diaphragm in sequence, and the second porous diaphragms positioned on the outermost sides of the two ends of the second core cladding units are omitted; the number of the second bending sections of the second core packet is 1 less than that of the first bending sections of the first core packet, and correspondingly, the first bending section at the tail position in all the first bending sections of the first core packet does not cross the second straight section in the length extension direction of the second core packet.
Another aspect provides a battery cell comprising the composite core package for a battery cell described above.
Still another aspect provides a battery module, which includes the above-mentioned electric core.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
through setting up two core packages, make each core package all be snakelike, and have a plurality of kinks respectively, a plurality of straight sections, a plurality of positive ears and a plurality of negative pole ear, the second kinks of arbitrary second core package spanes the first straight section of first core package on the length extending direction of first core package, it is equipped with a first straight section to overlap between the second straight section of two adjacent second core packages, the first kinks of arbitrary first core package spanes the second straight section on the length extending direction of second core package, it is equipped with a second straight section to overlap between two adjacent first straight sections, make electric core can have high space utilization, high volume energy density, packaging efficiency is high.
Drawings
FIG. 1 is an exploded partial front view of a first core pack according to an embodiment of the present invention;
fig. 2 is a partial front view of a second core package deployment provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a core package for a battery cell according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first core package according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second core package according to an embodiment of the present invention;
fig. 6 is an exploded schematic view of a battery cell according to an embodiment of the present invention;
the symbols in the figures are as follows:
1 first core bag, 11 first bending section, 12 first flat straight section, 13 first positive electrode tab, 14 first negative electrode tab, 2 second core bag, 21 second bending section, 22 second flat straight section, 23 second positive electrode tab, 24 first negative electrode tab, 10 first positive electrode conductor, 20 first negative electrode conductor, 30 second positive electrode conductor, 40 second negative electrode conductor, 5 first positive electrode post, 6 first negative electrode post, 7 second positive electrode post, 8 second negative electrode post, 9 cover plate basal body.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed connections and removable connections; can be directly connected or indirectly connected through intermediate components; the specific meaning of the above terms can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1 to 6, an embodiment of the present invention provides a core package for a battery cell, which includes two core packages, respectively: first core package 1 and second core package 2, the structure of two core packages is the same, all is snakelike, is similar with the snakelike structure in the snakelike heat exchanger, and all has a plurality of kinks, a plurality of straight section, a plurality of anodal utmost point ear and a plurality of negative pole utmost point ear, and the both ends of arbitrary kinks are connected with an end of two adjacent straight sections respectively, and one end of one of them straight section is connected with an end of kinks promptly, and another end of straight section is connected with another end of kinks. Along the length extending direction of core package, a plurality of anodal ears and a plurality of negative pole ear crisscross formation each other in the both sides of core package, a plurality of anodal ears all are located one side of core package promptly, a plurality of negative pole ears all are located the opposite side of core package, and stagger the both sides that form at the core package with the order of anodal ear, negative pole ear, anodal ear, in fig. 1, 2 first anodal ears 13 and 2 first negative pole ears 14 have been illustrated altogether, along the direction from a left side to the right side, the utmost point ear that forms on the first core package 1 do respectively in proper order: the first positive tab 13 positioned on the upper side of the first core pack 1, the first negative tab 14 positioned on the lower side of the first core pack 1, the first positive tab 13 positioned on the upper side of the first core pack 1, and the first negative tab 14 positioned on the lower side of the first core pack 1. In fig. 2, 2 second positive tabs 23 and 2 second negative tabs 24 are illustrated, and for convenience of distinction, the bent section of the first core package 1 is referred to as a first bent section 11, the straight section is referred to as a first straight section 12, the positive tabs are referred to as first positive tabs 13, and the negative tabs are referred to as first negative tabs 14. The bent section of the second core package 2 is referred to as a second bent section 21, the straight section is referred to as a second straight section 22, the positive tab is referred to as a second positive tab 23, and the negative tab is referred to as a second negative tab 24.
Any one of the first bending sections 11 crosses the second straight section 22 in the length extending direction of the second core package 2, that is, the inner surface of the first bending section 11 is opposite to the long side of the second straight section 22, at this time, both end portions of the first bending section 11 are arranged on both sides of the second straight section 22 along the length direction of the second core package 2, a second straight section 22 is stacked between two adjacent first straight sections 12, any one of the second bending sections 21 crosses the first straight section 12 in the length extending direction of the first core package 1, that is, the inner surface of the second bending section 21 is opposite to the long side of the first straight section 12, both end portions of the second bending section 21 are arranged on both sides of the second straight section 22 along the length direction of the first core package 1, and a first straight section 12 is stacked between two adjacent second straight sections 22, in other words, the first core package 1 and the second core package 2 are stacked or spun to form a battery cell, at this time, the composite core package can be called a stacked and spun composite core package. The extending direction of the long side of each straight section is consistent with the length extending direction of the corresponding core bag. The assembled battery cell can be assembled into a square column battery cell.
By arranging two core packages, each core package is snakelike, the core package is provided with a plurality of bending sections, a plurality of straight sections, a plurality of positive lugs and a plurality of negative lugs, the second bending section 21 of any second core package 2 stretches across the first straight section 12 of the first core package 1 in the length extension direction of the first core package 1, a first straight section 12 is overlapped between the second straight sections 22 of two adjacent second core packages 2, the first bending section 11 of any first core package 1 stretches across the second straight section 22 in the length extension direction of the second core package 2, and a second straight section 22 is overlapped between two adjacent first straight sections 12, so that the battery cell has high space utilization rate, high volume energy density and high assembly efficiency.
The porous membrane, the positive electrode, the porous membrane and the negative electrode are used as repeating units and are stacked into a plurality of layers, the number of the repeating units can be 1 layer (i.e. 1 repeating unit) or can be a plurality of layers (i.e. a plurality of repeating units), and the embodiment does not limit the number. The upper and lower outermost layers of all the repeating units are porous separators, and the width of the separator is wider than the width of the positive electrode and the width of the negative electrode. And cutting a plurality of positive lugs and a plurality of negative lugs which are arranged in a staggered mode on the positive current collector and the negative current collector, wherein the lugs are equidistant. The above is denoted as the first core package.
And assembling the second core package in the same way, vertically stacking the head part of the second core package together with the head part of the first core package, sequentially stacking each radian of the first core package and the second core package in a snake-shaped stacking way until the remaining part is stacked, and obtaining the core package (or called composite core package) which is marked as a mother core. And cutting the mother spinning core into a plurality of sections, and attaching termination adhesive tapes to the head end and the tail end of each section to obtain each section of spinning core, wherein each spinning core is a core package and can be further assembled into a battery core. In order to improve the production efficiency, the long mother core is cut to obtain a core with a target size.
The second straight section 22 and the first straight section 12 are arranged in a cross manner, that is, the second straight section 22 and the first straight section 12 are vertically overlapped, so that the second bending section 21 and the first bending section 11 are staggered in the width direction of the second core package 2 and the width direction of the first core package 1, and the arrangement of the tabs and the connection of the tabs and the pole columns of the cover plate are facilitated. Specifically, the positive tab and the negative tab are both disposed on the bending sections, that is, one of the two adjacent bending sections is disposed with the positive tab, and the other is disposed with the negative tab. For the first core pack 1, the adjacent first positive tab 13 and the first negative tab 14 are respectively disposed on the adjacent two first bent sections 11. For the second core pack 2, the adjacent second positive tab 23 and second negative tab 24 are respectively disposed on the adjacent two second bent sections 21.
The distance between the positive tab and the negative tab of each core package is equidistant, that is, the distance between any two adjacent first positive tabs 13 and first negative tabs 14 is equal, and the distance between any two adjacent second positive tabs 23 and second negative tabs 24 is equal, so that the ohmic resistance is small, the overcurrent is not easy, the space is symmetrical, the current stability is good, and the processing and the manufacturing of the tabs are convenient.
Along the length extending direction of first core package, first anodal ear and the anodal ear of second all are located one side of first core package, and first negative pole ear and second negative pole ear all are located the opposite side of first core package, so further do benefit to the formation of being connected of the conductor (utmost point post) of utmost point ear and apron and multiple equivalent circuit between the electric core.
The bending sections of the core packages are arc sections, that is, the first bending section 21 is an arc section, and the second bending section 22 is an arc section, so that the overlapping of the two core packages is facilitated, and the core packages can be self-adaptively deformed to a certain extent. The central angle corresponding to the arc section may be 180 ° or greater than 180 °, for example, 210 °, which is favorable to improve the self-adaptive ability of the core package to deformation. The bend and the straight section are tangent at one end or the other end of the bend, i.e. a smooth transition.
The following explains the manufacturing method of the core package by taking the porous diaphragm, the positive electrode, the porous diaphragm and the negative electrode as repeating units:
in an embodiment, the first core pack 1 includes: the first core pack single bodies are stacked in sequence to form a stacked structure, the first core pack single bodies are stacked in sequence of a first porous diaphragm, a first positive electrode, a first porous diaphragm and a first negative electrode, the first porous diaphragm opposite to the first negative electrode is stacked on the outer side of the first core pack single bodies, the outer side refers to a negative electrode side, after the first core pack single bodies are stacked, the outermost layer of one side is the negative electrode, the outermost layer of the other side is the first porous diaphragm, and in order to avoid direct contact between the first negative electrode and adjacent parts, a layer of the first porous diaphragm is added on the outer side of the first core pack single bodies. The number of the first core cladding units may be one, or may also be multiple, for example, 2, which is not limited in this embodiment. The second core pack 2 includes: the second core cladding units are of a laminated structure formed by sequentially laminating a second porous diaphragm, a second anode, a second porous diaphragm and a second cathode, and two sides of the second core cladding units are respectively laminated with a nonporous diaphragm opposite to the second anode and a nonporous diaphragm opposite to the second anode. The two sides are respectively referred to as a negative electrode side and a positive electrode side, when a plurality of second core clad units are stacked, the outermost layer of one side is a negative electrode, so that the side is referred to as the negative electrode side, the outermost layer of the other side is a first porous diaphragm, the first porous diaphragm is adjacent to a second positive electrode, so that the side is referred to as the positive electrode side, a non-porous diaphragm is added on the negative electrode side, and the second porous diaphragm is replaced by the non-porous diaphragm on the positive electrode side. The number of the second core cladding monomers may be one, or may also be multiple, for example, 2, which is not limited in this embodiment. The nonporous diaphragm is a nonporous diaphragm for a lithium battery and has the following characteristics: thermal insulation, non-conductivity, and not allowing electrolyte to pass through. The porous diaphragm is used for lithium battery and has the following characteristics: thermally insulating, electrically non-conducting, allowing electrolyte to pass through, such as PP (polypropylene) membranes and Polyethylene (PE) membranes, etc. The porous diaphragm and the nonporous diaphragm are mainly different in that one diaphragm is provided with micropores and can play a role in transmitting ions, and the other diaphragm is not provided with micropores and cannot play a role in transmitting ions. Through the design, the two core packages are independent and do not react with each other, the two core packages are required to be injected with liquid respectively in the follow-up process, and the two core packages can be regarded as two equivalent power supplies in the follow-up equivalent circuit of the design of the electric core, so that the electric core has high thermal safety and high structural stability. For the method of liquid injection, reference may be made to the contents of liquid injection in the prior art, and details thereof are not described herein. The number of the second bending sections of the second core pack is the same as that of the first bending sections of the first core pack. The porous separator and the non-porous separator are wider than the width of the respective positive electrode and the width of the negative electrode. In the manufacturing process, the protruded diaphragm part can be heated and pressed between the lugs, and the diaphragm can be sewed by utilizing the high polymer thermoplasticity.
In another embodiment, the first core pack 1 includes: the core cladding comprises a plurality of superposed first core cladding units, wherein the first core cladding units are of a laminated structure formed by superposing a first porous diaphragm, a first positive electrode, a first porous diaphragm, a first negative electrode, a first porous diaphragm, a first positive electrode and a first porous diaphragm in sequence. The second core pack 2 includes: the second core cladding units are stacked in sequence to form a laminated structure, wherein the laminated structure is formed by stacking a second porous diaphragm, a second negative electrode, a second porous diaphragm, a second positive electrode, a second porous diaphragm, a second negative electrode and a second porous diaphragm. Through the design, the two core packages are reacted with each other without being injected with liquid respectively, the subsequent cell design equivalent circuit can be regarded as a power supply, the processing is convenient, and the energy density is higher than that of the previous embodiment. For the method of liquid injection, reference may be made to the contents of liquid injection in the prior art, and details thereof are not described herein. The number of the second bending sections of the second core packet is the same as that of the first bending sections of the first core packet.
In yet another embodiment, the first core pack 1 includes: the first core cladding units are stacked in sequence to form a laminated structure, wherein the laminated structure is formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm, a first negative electrode, a first porous diaphragm, a first positive electrode and a first porous diaphragm. The second core pack 2 includes: the core pack comprises a plurality of stacked second core pack monomers, wherein the second core pack monomers are of a laminated structure formed by stacking a second porous diaphragm, a second negative electrode, a second porous diaphragm, a second positive electrode, a second porous diaphragm, a second negative electrode and a second porous diaphragm in sequence, and the second porous diaphragm positioned on the outermost side of the two ends of the second core pack monomers is omitted.
In one embodiment, a cell, such as a lithium battery cell, is provided. The battery core comprises the composite core package and the cover plate. The cover plate has: the cover plate comprises a cover plate base body 9, a first positive electrode conductor 10, a first negative electrode conductor 20, a second positive electrode conductor 30, a second negative electrode conductor 40, a positive electrode pole and a negative electrode pole. One end of the first positive conductor 10 is connected to the first positive tab 13, one end of the first negative conductor 20 is connected to the first negative tab, one end of the second positive conductor 30 is connected to the second positive tab, and one end of the second negative conductor 40 is connected to the second negative tab. One of the two positive conductors is connected with the positive pole column, one of the two negative conductors is connected with the negative pole column, and the other of the two positive conductors can be connected with the other positive pole column after being connected with the one positive conductor, can also be connected with the other positive pole column in independent configuration, and can also be connected with the other negative conductor in the two negative conductors. The other of the two cathode conductors can be connected with the one cathode conductor and then connected with the one cathode pole, can also be connected with the other cathode pole which is independently configured, and can also be connected with the other of the two anode conductors. The connection mode is not limited in this embodiment, and may be determined according to the equivalent circuit design of the core package.
In fig. 6, two positive electrode posts and two negative electrode posts are illustrated. The two anode poles are respectively: a first positive pole 5 and a second positive pole 7. The two cathode posts are respectively a first cathode post 6 and a second cathode post 8. Four mounting positions are formed on the cover plate base body 9, and each mounting position is used for mounting one positive pole post or one negative pole post. The four mounting positions are four vertexes of the virtual quadrangle. The virtual quadrangle may be formed by connecting four mounting sites in sequence with a virtual straight line segment. The cover substrate is preferably rectangular. The mounting position that corresponds when first positive pole post 5 is installed on apron base member 9 sets up with the mounting position diagonal that corresponds when first negative pole post 6 is installed on apron base member 9, and these two mounting positions are two summits that the diagonal of virtual quadrangle set up promptly, and in fig. 6, one of these two mounting positions is located the upper left portion of apron base member 9, and another mounting position is located the lower right portion of apron base member 9. The mounting position corresponding to the second positive electrode post 7 when mounted on the cover plate base body 9 and the mounting position corresponding to the second negative electrode post 8 when mounted on the cover plate base body 9 are diagonally arranged, and in fig. 6, one of the two mounting positions is located at the upper right portion of the cover plate base body 9, and the other mounting position is located at the lower left portion of the cover plate base body 9. The anode pole is usually an aluminum pole, and the cathode pole is usually a copper or copper-aluminum composite pole. Referring to fig. 6, along the clockwise direction of the virtual quadrangle, the poles corresponding to the 4 mounting positions may be a first positive pole 5, a second positive pole 7, a first negative pole 6, and a second negative pole 8 in sequence. The virtual quadrangle is a virtual rectangle, so that the connection between the positive pole posts, between the negative pole posts and between the positive pole posts and the negative pole posts is facilitated.
In an embodiment, a battery module is provided, which includes the battery cell.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (9)
1. A composite core package for a battery cell, the composite core package comprising:
the first core package is snakelike and is provided with a plurality of first bending sections, a plurality of first straight sections, a plurality of first positive lugs and a plurality of first negative lugs, two end parts of any one first bending section are respectively connected with one end part of each of two adjacent first straight sections, and the first positive lugs and the first negative lugs are mutually staggered to form two sides of the first core package along the length extension direction of the first core package;
the second core packet has the same structure as the first core packet and is provided with a plurality of second bending sections, a plurality of second straight sections, a plurality of second positive lugs and a plurality of second negative lugs;
any one second bending section transversely spans the first straight section in the length extension direction of the first core bag, and one first straight section is arranged between two adjacent second straight sections in a stacked mode;
any first bending section transversely spans the second straight section in the length extension direction of the second core bag, and one second straight section is overlapped between two adjacent first straight sections;
the first positive tab and the first negative tab which are adjacent are respectively arranged on the two first bending sections which are adjacent, and the second positive tab and the second negative tab which are adjacent are respectively arranged on the two second bending sections which are adjacent;
the second straight section and the first straight section are arranged in a cross manner.
2. The composite core package of claim 1, wherein the distance between any two adjacent first positive and negative tabs is equal;
and the distance between any two adjacent second positive electrode tabs and second negative electrode tabs is equal.
3. The composite core package of claim 2, wherein the first positive tab and the second positive tab are located on one side of the first core package and the first negative tab and the second negative tab are located on the other side of the first core package along a length extension of the first core package.
4. The composite core package of claim 1, wherein the first bend segment is an arc segment;
the second bending section is an arc section.
5. The composite core package of claim 1, wherein the first core package comprises: the core pack comprises a plurality of first core pack monomers which are stacked, wherein the first core pack monomers are of a laminated structure formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm and a first negative electrode in sequence, and the first porous diaphragm opposite to the first negative electrode is stacked on the outer side of the first core pack monomers which are stacked;
the second core pack includes: the core pack comprises a plurality of stacked second core pack monomers, wherein the second core pack monomers are of a laminated structure formed by stacking a second porous diaphragm, a second positive electrode, a second porous diaphragm and a second negative electrode in sequence, a nonporous diaphragm opposite to the second negative electrode is stacked on one side of the plurality of stacked second core pack monomers, and a nonporous diaphragm opposite to the second positive electrode is stacked on the other side of the plurality of stacked second core pack monomers and used for replacing the second porous diaphragm stacked with the second positive electrode.
6. The composite core package of claim 1, wherein the first core package comprises: the core pack comprises a plurality of first core pack monomers which are stacked, wherein each first core pack monomer is of a laminated structure formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm, a first negative electrode, a first porous diaphragm, a first positive electrode and a first porous diaphragm in sequence;
the second core pack includes: the second core cladding units are stacked, and each second core cladding unit is of a laminated structure formed by stacking a second porous diaphragm, a second negative electrode, a second porous diaphragm, a second positive electrode, a second porous diaphragm, a second negative electrode and a second porous diaphragm in sequence.
7. The composite core package of claim 1, wherein the first core package comprises: the core pack comprises a plurality of first core pack monomers which are stacked, wherein each first core pack monomer is of a laminated structure formed by stacking a first porous diaphragm, a first positive electrode, a first porous diaphragm, a first negative electrode, a first porous diaphragm, a first positive electrode and a first porous diaphragm in sequence;
the second core pack includes: the second core cladding units are stacked, each second core cladding unit is of a laminated structure formed by stacking a second porous diaphragm, a second negative electrode, a second porous diaphragm, a second positive electrode, a second porous diaphragm, a second negative electrode and a second porous diaphragm in sequence, and the second porous diaphragms positioned on the outermost sides of the two ends of the second core cladding units are omitted;
the number of the second bending sections of the second core pack is less than 1 of the first bending sections of the first core pack, and correspondingly, the first bending section at the tail position in all the first bending sections of the first core pack does not cross the second straight section in the length extension direction of the second core pack.
8. A battery cell, comprising the composite core package for a battery cell of any of claims 1-7.
9. A battery module, characterized by comprising the battery cell of claim 8.
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| CN117133998B (en) * | 2023-10-26 | 2024-03-15 | 宁德时代新能源科技股份有限公司 | Electrode assembly, preparation method, pole piece, battery monomer, battery and power utilization device |
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| CN104900905A (en) * | 2015-06-03 | 2015-09-09 | 深圳市迪凯特电池科技有限公司 | Laminated lithium ion battery and production process thereof |
| CN212113874U (en) * | 2020-07-01 | 2020-12-08 | 杭州威宏能源科技有限公司 | Special-shaped laminated battery |
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| JPH08203539A (en) * | 1994-12-13 | 1996-08-09 | Pioneer Electron Corp | Laminated type battery |
| CN102664285A (en) * | 2012-02-27 | 2012-09-12 | 宁德新能源科技有限公司 | Lithium ion battery and combination method of pole pieces thereof |
| CN103236564B (en) * | 2013-04-17 | 2015-07-22 | 河北工业大学 | Manufacturing method of lithium ion power battery with specific energy of 250Wh/Kg |
| CN210224211U (en) * | 2019-09-30 | 2020-03-31 | 蜂巢能源科技有限公司 | Battery pole group, battery and vehicle |
| CN212783563U (en) * | 2020-09-25 | 2021-03-23 | 合肥国轩高科动力能源有限公司 | Lithium ion battery and roll core structure thereof |
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| CN104900905A (en) * | 2015-06-03 | 2015-09-09 | 深圳市迪凯特电池科技有限公司 | Laminated lithium ion battery and production process thereof |
| WO2020256023A1 (en) * | 2019-06-18 | 2020-12-24 | 株式会社村田製作所 | Secondary battery |
| CN212113874U (en) * | 2020-07-01 | 2020-12-08 | 杭州威宏能源科技有限公司 | Special-shaped laminated battery |
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