CN112290132A - Square lamination lithium battery module of integrated into one piece - Google Patents
Square lamination lithium battery module of integrated into one piece Download PDFInfo
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- CN112290132A CN112290132A CN202011004453.3A CN202011004453A CN112290132A CN 112290132 A CN112290132 A CN 112290132A CN 202011004453 A CN202011004453 A CN 202011004453A CN 112290132 A CN112290132 A CN 112290132A
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- aluminum
- aluminum plate
- plate
- integrally formed
- integrally
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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
- H01M10/052—Li-accumulators
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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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides an integrally-formed square laminated lithium battery module, which comprises an integrally-formed aluminum shell, a plurality of laminated battery cells and a plurality of integrated cover plates, wherein the laminated battery cells are arranged on the integrally-formed aluminum shell; the top end of the integrally formed aluminum shell is open, and a plurality of aluminum partition plates are arranged in the integrally formed aluminum shell in parallel at intervals and divide the interior of the integrally formed aluminum shell into a plurality of mounting cavities; the laminated battery cores are respectively arranged in the installation cavities; a plurality of integral type apron sets up respectively on the top of a plurality of installation cavities and integral type apron edge and aluminum hull integrated weld shaping, and a plurality of integral type apron is connected with a plurality of lamination formula electricity cores respectively. The invention adopts the integrated aluminum shell, thereby reducing the weight of the grouped shell; by adopting the laminated cell, the effective utilization rate of the internal space of the shell is improved, and the energy density of the module is obviously improved; the liquid injection port and the safety valve aluminum sheet are combined into a whole, the cover plate structure is simplified, and the production and manufacturing cost of the battery is greatly reduced.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to an integrally-formed square laminated lithium battery module.
Background
The pure electric vehicle is one of new energy vehicles, and the most concerned of consumers is the endurance mileage, besides the consideration of the economy and the comfort of the pure electric vehicle. As an energy storage device for providing electric energy for a pure electric vehicle, the energy density of a power lithium ion battery is a direct influence factor of the endurance mileage. In order to obtain a power lithium ion battery with high energy density, measures such as improving the specific capacity of positive and negative active materials are taken, and the self weight of the battery is reduced as much as possible, and the latter is often the most effective method.
The main structural components of the square lithium ion battery comprise a battery shell, a battery cover plate, a pole, a connecting sheet and the like, wherein the weight ratio of the shell to the cover plate is the largest. On the premise of ensuring the self strength safety of the battery, the scheme of remarkably improving the energy density of the battery is realized by thinning the shell and lightening the cover plate. Conventional square aluminum-shell batteries are independent, and are paired into a battery module, wherein two shell surfaces are paired between the batteries, and one shell surface is redundant for the batteries themselves, so that the cost of the batteries is increased, and the process difficulty of assembling the module at a later stage is increased. In addition, the conventional winding scheme limits the utilization rate of the internal space of the battery case, and how to utilize the internal space of the case to the maximum extent can maximize the capacity and energy density of the battery.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an integrally-formed square laminated lithium battery module.
The invention provides an integrally-formed square laminated lithium battery module which comprises an integrally-formed aluminum shell, a plurality of laminated battery cells and a plurality of integrated cover plates, wherein the laminated battery cells are arranged on the integrally-formed aluminum shell; the top end of the integrally formed aluminum shell is open, and a plurality of aluminum partition plates are arranged in the integrally formed aluminum shell in parallel at intervals and divide the interior of the integrally formed aluminum shell into a plurality of mounting cavities; the laminated battery cores are respectively arranged in the installation cavities; a plurality of integral type apron sets up respectively on the top of a plurality of installation cavities and integral type apron edge and aluminum hull integrated weld shaping to a plurality of integral type apron are connected with a plurality of lamination formula electricity core respectively.
Preferably, the integrated into one piece formula aluminum hull includes bottom aluminum plate, first side aluminum plate, second side aluminum plate, third side aluminum plate and fourth side aluminum plate, bottom aluminum plate level is arranged, first side aluminum plate, second side aluminum plate, third side aluminum plate, fourth side aluminum plate is the vertical connection of ending in proper order and first side aluminum plate, second side aluminum plate, third side aluminum plate, fourth side aluminum plate bottom all with the perpendicular integrative welded forming of bottom aluminum plate, first side aluminum plate is parallel relative and second side aluminum plate and fourth side aluminum plate parallel relative with third side aluminum plate, the aluminium baffle is parallel with second side aluminum plate, aluminium baffle bottom and bottom aluminum plate integrative welded forming and its both sides respectively with first side aluminum plate, second side aluminum plate integrative welded forming.
Preferably, the thickness of the first side aluminum plate, the second side aluminum plate, the third side aluminum plate and the fourth side aluminum plate is 0.6-0.8mm, and the length of the second side aluminum plate and the fourth side aluminum plate is 140-180 mm.
Preferably, the thickness of the aluminum separator is 0.6-0.8mm, and the distance between two adjacent aluminum separators is 20-30 mm.
Preferably, the laminated cell consists of positive plates, negative plates and diaphragms, wherein the number of the positive plates is 30-50, the number of the negative plates is 31-51, and the number of the diaphragms is 32-52.
Preferably, the positive plate of the laminated cell takes lithium iron phosphate as an active main material, graphene as a conductive assistant, polyvinylidene fluoride as a binder, carbon-coated aluminum foil with the thickness of 12-16 mu m as a current collector, the single-sided surface density of the positive electrode dressing layer is 200-220g/m2, and the double-sided surface density is 400-440g/m 2.
Preferably, the negative plate of the laminated cell takes natural graphite as an active main material, graphene as a conductive assistant, polytetrafluoroethylene as a binder, and a carbon-coated copper foil with the thickness of 6-8 μm as a current collector, the single-sided surface density of the negative coating layer is 110g/m2, and the double-sided surface density is 200-220g/m 2.
Preferably, the diaphragm of the laminated cell comprises a 2-4 μm rubberized ceramic layer and a 10-14 μm polyethylene-based film.
Preferably, the integral type apron includes aluminium base board, has seted up on the aluminium base board and has annotated the liquid mouth, annotates integrative seal weld in liquid mouth department and have the relief valve aluminum sheet, is connected with positive terminal, negative terminal, anodal aluminium connection piece and negative pole copper connection piece on the aluminium base board.
Preferably, the thickness of the aluminum base plate is 2-3mm, the thickness of the positive terminal and the negative terminal is 2-4mm, the thickness of the cover plate stopping frame is 2-3mm, and the thickness of the safety valve aluminum sheet is 0.3 mm.
The integrally-formed square laminated lithium battery module provided by the invention adopts the integrally-formed aluminum shell, so that the weight of the shell is reduced; by adopting the laminated cell, the utilization rate of the internal space of the shell is improved, and the energy density of the module is obviously improved; will annotate liquid mouth and relief valve aluminum sheet and unite two into one, retrench the apron structure, greatly reduced the production manufacturing cost of battery, show the energy density who promotes the battery.
Drawings
Fig. 1 is a schematic structural diagram of an integrally formed square laminated lithium battery module according to the present invention;
fig. 2 is a schematic structural diagram of an aluminum shell in an integrally formed square laminated lithium battery module according to the present invention;
fig. 3 is a schematic structural view of an aluminum substrate portion in an integrally formed square laminated lithium battery module according to the present invention.
Detailed Description
Referring to fig. 1 to 3, the invention provides an integrally formed square laminated lithium battery module, which includes an integrally formed aluminum shell 1, a plurality of laminated battery cells 2 and a plurality of integrated cover plates 3; wherein:
open and its inside parallel interval in 1 top of integrated into one piece formula aluminum hull is provided with a plurality of aluminium baffles 4, and a plurality of aluminium baffles 4 separate into a plurality of installation cavities with 1 internal portion of integrated into one piece formula aluminum hull. The integrated aluminum shell 1 comprises a bottom aluminum plate, a first side aluminum plate, a second side aluminum plate, a third side aluminum plate and a fourth side aluminum plate, the bottom aluminum plate is horizontally arranged, the first side aluminum plate, the second side aluminum plate, the third side aluminum plate, the fourth side aluminum plate is sequentially connected in a vertical mode in a tail closing mode, the first side aluminum plate, the second side aluminum plate, the third side aluminum plate, the fourth side aluminum plate bottom is integrally welded with the bottom aluminum plate in a vertical mode, the first side aluminum plate is opposite to the third side aluminum plate in a parallel mode, the second side aluminum plate is opposite to the fourth side aluminum plate in a parallel mode, an aluminum partition plate 4 is parallel to the second side aluminum plate, the bottom of the aluminum partition plate 4 is integrally welded with the bottom aluminum plate.
A plurality of lamination formula electricity core 2 set up respectively in a plurality of installation intracavity. The laminated cell 2 is composed of 47 positive plates, 481 negative plates and 49 diaphragms.
A plurality of integral type apron 3 set up respectively on the top of a plurality of installation cavities and integral type apron edge and aluminum hull integrated weld shaping to a plurality of integral type apron 3 are connected with a plurality of lamination formula electricity core 2 respectively.
In a specific embodiment, the thickness of the first side aluminum plate, the second side aluminum plate, the third side aluminum plate and the fourth side aluminum plate is 0.6mm, and the length of the second side aluminum plate and the fourth side aluminum plate is 150 mm. The thickness of the aluminum partition plates 4 is 0.5mm, and the distance between two adjacent aluminum partition plates 4 is 30 mm.
In a specific embodiment, the positive plate of the laminated cell 2 uses lithium iron phosphate as an active main material, graphene as a conductive auxiliary agent, polyvinylidene fluoride as a binder, a carbon-coated aluminum foil with a thickness of 12-16 μm as a current collector, and the single-side surface density of the positive electrode coating layer is 200-220g/m2The density of the double-sided surface is 400-440g/m2. The negative plate of the laminated cell 2 takes natural graphite as an active main material, graphene as a conductive auxiliary agent, polytetrafluoroethylene as a binder, a carbon-coated copper foil with the thickness of 6-8 mu m as a current collector, and the single-side surface density of the negative coating layer is 100-2The density of the double-sided surface is 200-220g/m2. The diaphragm of the laminated battery core 2 comprises a 2-4 mu m rubber coating ceramic layer and a 10-14 mu m polyethylene base film.
In the specific embodiment, the integrated cover plate 3 includes an aluminum substrate 31, a liquid injection port 36 is formed in the aluminum substrate 31, a safety valve aluminum sheet 37 is integrally welded at the liquid injection port 36 in a sealing manner, the aperture of the liquid injection port 36 is 3mm, and the diameter of the safety valve aluminum sheet 37 is 5mm and the thickness of the safety valve aluminum sheet is 0.3 mm. The aluminum substrate 31 is connected with a positive terminal 32, a negative terminal 33, a positive aluminum connecting sheet 34 and a negative copper connecting sheet 35, the aluminum substrate 3 has a length of 150mm, a width of 30mm and a thickness of 2.5mm, the plastic stop frame on the aluminum substrate 3 has a thickness of 3mm, the positive terminal 32 and the negative terminal 33 have a thickness of 2-4mm, and the cover plate 3 has a stop frame thickness of 2-3 mm.
The invention also discloses a preparation method of the integrally formed square laminated lithium battery module, which comprises the following steps:
step (1): respectively die-cutting a positive plate, a negative plate and a diaphragm, alternately laminating the diaphragms according to a diaphragm/negative electrode/diaphragm/positive electrode … … diaphragm/positive electrode/diaphragm/negative electrode/diaphragm layer by layer to prepare a battery cell, tightly attaching the side edge of the battery cell by using a high-temperature-resistant insulating adhesive tape 23, and then ultrasonically pre-welding a positive aluminum tab 21 and a negative copper tab 22;
step (2): respectively carrying out ultrasonic welding on the positive electrode aluminum lug 21 and the negative electrode copper lug 22 with the positive electrode aluminum connecting sheet 34 and the negative electrode copper connecting sheet 35, sticking a high-temperature-resistant insulating adhesive tape 23 on the exposed lugs and connecting sheets, and then coating and sticking an insulating film on the surface of the electric core 2;
and (3): sequentially bending a connecting structure of an aluminum electrode lug 21 and a copper electrode lug 22 of the battery cell 2 in a Z shape, putting the battery cell into an integrally formed aluminum shell, and hermetically welding the aluminum shell 1 and the integrated cover plate 3 by laser welding;
and (4): after high-temperature circulating vacuum baking for removing water, injecting electrolyte into the integrated cover plate 3 through the liquid injection port 36, after formation charging and high-temperature aging and exhausting, placing the safety valve aluminum sheet 37 at the liquid injection port, and sealing the safety valve aluminum sheet along the edge gap of the safety valve through laser welding to obtain the integrally-formed square lithium ion battery module.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. An integrally-formed square laminated lithium battery module is characterized by comprising an integrally-formed aluminum shell (1), a plurality of laminated battery cores (2) and a plurality of integrated cover plates (3); the top end of the integrally formed aluminum shell (1) is open, a plurality of aluminum partition plates (4) are arranged in the integrally formed aluminum shell in parallel at intervals, and the integrally formed aluminum shell (1) is divided into a plurality of installation cavities by the plurality of aluminum partition plates (4); the laminated battery cores (2) are respectively arranged in the installation cavities; a plurality of integral type apron (3) set up respectively on the top of a plurality of installation cavities and integral type apron edge and aluminum hull integrated weld shaping to a plurality of integral type apron (3) are connected with a plurality of lamination formula electricity core (2) respectively.
2. The integrally formed square laminated lithium battery module according to claim 1, wherein the integrally formed aluminum case (1) comprises a bottom aluminum plate, a first side aluminum plate, a second side aluminum plate, a third side aluminum plate and a fourth side aluminum plate, the bottom aluminum plate is horizontally arranged, the first side aluminum plate, the second side aluminum plate, the third side aluminum plate and the fourth side aluminum plate are sequentially connected in a vertical manner in a tail closing manner, the bottoms of the first side aluminum plate, the second side aluminum plate, the third side aluminum plate and the fourth side aluminum plate are all integrally welded with the bottom aluminum plate in a vertical manner, the first side aluminum plate and the third side aluminum plate are parallel and opposite, the second side aluminum plate and the fourth side aluminum plate are parallel and opposite, the aluminum partition plate (4) is parallel to the second side aluminum plate, the bottom end of the aluminum partition plate (4) is integrally welded with the bottom aluminum plate, and the.
3. The integrally formed square laminated lithium battery module as claimed in claim 2, wherein the first, second, third and fourth aluminum plates have a thickness of 0.6-0.8mm, and the second and fourth aluminum plates have a length of 140-180 mm.
4. The integrally formed square laminate lithium battery module according to any one of claims 1 to 3, wherein the aluminum separators (4) have a thickness of 0.6 to 0.8mm and the interval between two adjacent aluminum separators (4) is 20 to 30 mm.
5. The integrally formed square laminated lithium battery module according to claim 1, wherein the laminated cell (2) is composed of positive plates, negative plates and diaphragms, wherein the number of the positive plates is 30-50, the number of the negative plates is 31-51, and the number of the diaphragms is 32-52.
6. The integrally formed square laminated lithium battery module as claimed in claim 5, wherein the positive plate of the laminated cell (2) is made of lithium iron phosphate as an active main material, graphene as a conductive auxiliary agent, polyvinylidene fluoride as a binder, a carbon-coated aluminum foil with a thickness of 12-16 μm as a current collector, and the single-sided surface density of the positive coating layer is 200-2The density of the double-sided surface is 400-440g/m2。
7. The square laminated lithium battery module as claimed in claim 5, wherein the negative electrode sheet of the laminated cell (2) comprises natural graphite as active material, graphene as conductive additive, polytetrafluoroethylene as binder, and carbon-coated copper foil with a thickness of 6-8 μm as current collector, and the density of the single surface of the negative electrode coating layer is 100-2The density of the double-sided surface is 200-220g/m2。
8. The integrally formed square-laminated lithium battery module according to claim 5, wherein the separator of the laminated cell (2) comprises a 2-4 μm rubberized ceramic layer and a 10-14 μm polyethylene-based film.
9. The integrally formed square laminated lithium battery module according to claim 1, wherein the integral cover plate (3) comprises an aluminum substrate (31), a liquid injection port (36) is formed in the aluminum substrate (31), a safety valve aluminum sheet (37) is integrally and hermetically welded at the liquid injection port (36), and the aluminum substrate (31) is connected with a positive terminal (32), a negative terminal (33), a positive aluminum connecting sheet (34) and a negative copper connecting sheet (35).
10. The integrally formed square laminated lithium battery module according to claim 9, wherein the aluminum substrate (31) has a thickness of 2-3mm, the positive terminal (32) and the negative terminal (33) have a thickness of 2-4mm, the stopper frame of the cap plate (3) has a thickness of 2-3mm, and the safety valve aluminum sheet (37) has a thickness of 0.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011004453.3A CN112290132A (en) | 2020-09-22 | 2020-09-22 | Square lamination lithium battery module of integrated into one piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011004453.3A CN112290132A (en) | 2020-09-22 | 2020-09-22 | Square lamination lithium battery module of integrated into one piece |
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| Publication Number | Publication Date |
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| CN112290132A true CN112290132A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011004453.3A Pending CN112290132A (en) | 2020-09-22 | 2020-09-22 | Square lamination lithium battery module of integrated into one piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022121487A1 (en) * | 2020-12-09 | 2022-06-16 | 华为数字能源技术有限公司 | Battery module, battery pack, and vehicle |
| WO2023133848A1 (en) * | 2022-01-14 | 2023-07-20 | 宁德时代新能源科技股份有限公司 | Battery, electric device, and battery manufacturing method and device |
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Application publication date: 20210129 |