CN111276732A - Monomer formula battery and battery module - Google Patents
Monomer formula battery and battery module Download PDFInfo
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- CN111276732A CN111276732A CN202010239412.6A CN202010239412A CN111276732A CN 111276732 A CN111276732 A CN 111276732A CN 202010239412 A CN202010239412 A CN 202010239412A CN 111276732 A CN111276732 A CN 111276732A
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- 239000000178 monomer Substances 0.000 title description 2
- 239000000758 substrate Substances 0.000 claims abstract description 50
- 229920003023 plastic Polymers 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000011810 insulating material Substances 0.000 claims abstract description 4
- 230000000712 assembly Effects 0.000 claims description 10
- 238000000429 assembly Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 description 12
- 238000009434 installation Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
-
- 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
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- 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
-
- 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
-
- 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)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a single battery and a battery module, and belongs to the technical field of batteries. The single battery comprises a battery cell and a shell arranged outside the battery cell, wherein a positive electrode lug and a negative electrode lug are respectively arranged on two sides of the battery cell, openings are respectively arranged at two ends of the shell, and the single battery also comprises cover plate components, and the two cover plate components are respectively arranged at the openings at two ends of the shell in a sealing manner; the cover plate assembly comprises a top cover substrate, a polar plate, lower plastic and a polar column, wherein the polar plate is arranged on one side of the top cover substrate and is electrically connected with the positive electrode tab or the negative electrode tab; the lower plastic is made of an insulating material and is arranged between the top cover substrate and the polar plate, and the end face, far away from the top cover substrate, of the lower plastic is abutted against the side face of the battery cell; the pole column sequentially penetrates through the top cover substrate and the lower plastic and then is electrically connected with the pole plate. The battery module comprises the single battery. The single battery improves the utilization rate of the internal space of the single battery and the density of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a single battery and a battery module.
Background
The lithium battery has the advantages of high capacity, wide working temperature range, stable discharge, environmental friendliness, no pollution, good safety performance, multiple cycle times and the like, and is widely applied to electronic products such as notebook computers, digital cameras, electric vehicles and other equipment at present.
In the current power battery products, when cylindrical batteries are used, the number of the batteries is too large, and higher requirements are also put forward on a battery management system of a vehicle. And the cylindrical battery adopts stainless steel with higher strength as a shell, so that the weight is high, and the energy density is relatively lower. Laminate formula design is inside for laminate formula, need add the one deck thin slice in the middle of every two batteries, can be full of liquid in the thin slice, through heating or refrigeration in order to guarantee that the battery is in optimum operating temperature, make laminate polymer battery control system comparatively complicated. The square battery has the advantages of high packaging reliability, high system energy efficiency, light relative weight, high energy density and the like, and has high popularization rate in China. However, the square battery is limited by the fact that the weight of the external package is large, and when the installation space of the battery module is fixed, the height of the module needs to be reduced, so that the capacity of the battery pack is affected, and the space utilization rate of the module is reduced.
In the prior art, the positive terminal and the negative terminal of a square battery are both arranged at the top end of the battery, so that the height of a battery module is increased, and the installation space of the battery module is limited; in addition, the battery core and the battery top cover are connected through a soft connection structure, the top cover has no supporting function, and a retainer is required to limit, fix and support the battery core, so that the structure of the top cover is complex, the assembly process is complex, and the volume of the battery is increased.
Disclosure of Invention
An object of the present invention is to provide a single cell battery, which has a simple structure and is convenient to assemble, and which can improve the utilization rate of the internal space of the single cell battery and the density of the battery.
In order to realize the purpose, the invention adopts the following technical scheme:
a single battery comprises a battery core and a shell arranged outside the battery core, wherein a positive electrode lug and a negative electrode lug are respectively arranged on two sides of the battery core, openings are respectively arranged at two ends of the shell, and the single battery also comprises cover plate assemblies, and the two cover plate assemblies are respectively arranged at the openings at two ends of the shell in a sealing manner; the cover plate assembly includes:
a top cover substrate;
the polar plate is arranged on one side of the top cover substrate and is electrically connected with the positive pole lug or the negative pole lug;
the lower plastic is made of an insulating material and is arranged between the top cover substrate and the polar plate, and the end face, far away from the top cover substrate, of the lower plastic is abutted against the side face of the battery cell;
the polar plate is arranged in the groove and is electrically connected with the positive pole lug or the negative pole lug;
and the pole column sequentially penetrates through the top cover substrate and the lower plastic and is electrically connected with the polar plate.
Optionally, the cross-section of the plate is rectangular, and the aspect ratio of the rectangle is greater than 2.
Optionally, the cover plate assembly further comprises an explosion-proof valve, a connecting hole is formed in the top cover substrate, and the explosion-proof valve is arranged on the connecting hole.
Optionally, the pole plate is provided with two connection portions respectively connected to the pole post and the corresponding positive electrode tab or negative electrode tab, and at least one through hole is formed between the two connection portions.
Alternatively, the cell includes a plurality of attached positive electrode tabs and a plurality of attached negative electrode tabs,
the multilayer positive lugs are bonded through pressure or through an insulating film;
the multilayer negative electrode tabs are bonded by pressure or by binding through an insulating film.
Optionally, a lower groove is provided on the end face, and the plate is disposed in the lower groove.
Optionally, the cover plate assembly further comprises a seal disposed between the top cover substrate and the pole.
Optionally, the cover plate assembly further comprises a terminal connected with the pole, the terminal is in insulation joint with the top cover substrate, and the terminal is arranged on one side opposite to the lower plastic.
Optionally, the cover plate assembly further comprises an insulating upper plastic, the upper plastic is arranged between the terminal and the top cover substrate, an upper groove and a through hole are formed in the upper plastic, the pole column penetrates through the through hole of the upper plastic, and the upper groove is used for mounting the terminal.
Another object of the present invention is to provide a battery module, which improves the utilization rate of the installation space.
In order to realize the purpose, the invention adopts the following technical scheme:
a battery module comprises the single battery.
The invention has the beneficial effects that:
according to the single battery provided by the invention, the positive electrode lug and the negative electrode lug are arranged at the two ends of the battery core, and the positive electrode and the negative electrode are respectively arranged at the two sides of the single battery, so that the backflow area of the positive electrode post and the negative electrode post is enlarged, the overcurrent capacity is enhanced, and the multiplying power is good; the two cover plate assemblies are respectively arranged on two sides of the battery, so that the height of the single battery is reduced, when the chassis of the electric automobile is fixed in height, the limitation of the installation space on the single battery is reduced, and the installation adaptability of the single battery is improved. Through polar plate lug and utmost point ear of lug. The insulated lower plastic is respectively arranged between the polar plate and the top cover substrate, so that the polar plate is in insulated joint with the top cover substrate, and the safety performance of the battery is improved; the terminal surface butt of the lower plastic that makes insulating realizes the support and the fixed of electric core at the both ends of electric core, does not need additionally to set up holder isotructure and fixes electric core, has both improved battery cell's safety in utilization, has reduced the space that the holder occupy simultaneously again, has improved single battery inner space utilization, improves the density of battery.
According to the battery module, the single battery is adopted, and the size of the single battery is reduced, so that the utilization rate of the installation space of the battery module is improved.
Drawings
Fig. 1 is an exploded view of a unit cell provided in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a cover plate assembly according to an embodiment of the present invention;
FIG. 3 is a schematic view of another angled configuration of a cover plate assembly according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of FIG. 2;
fig. 5 is an exploded view of fig. 2.
In the figure:
100-a housing; 200-electric core; 201-positive tab; 202-negative tab;
300-a cover plate assembly; 1-a top cover substrate; 11-a connection hole; 12-liquid injection hole; 2-pole column; 3-pole plate; 4-discharging plastic; 41-lower groove; 42-end face; 5-a terminal; 6-coating plastic; 61-upper groove; 7-an explosion-proof valve; 8-sealing element.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1, the present embodiment provides a unit cell including a cell 200 and a hollow case 100 having both ends open, the cell 200 being accommodated in the case 100, the cell 200 including positive and negative electrode tabs 201 and 202 disposed at both sides thereof, respectively. The two end openings of the casing 100 are respectively provided with a cover plate assembly 300 in a sealing manner, and the two cover plate assemblies 300 are respectively abutted against the two sides of the battery cell 200 to support and fix the battery cell 200. The positive electrode and the negative electrode are respectively arranged on two sides of the single battery, so that the backflow area of the positive electrode pole and the negative electrode pole is enlarged, the overcurrent capacity is enhanced, and the multiplying power is good; the two cover plate assemblies 300 are disposed at both sides of the battery, thereby reducing the height of the single battery, reducing the installation space limitation of the installation space to the single battery when the chassis height of the electric vehicle is constant, and increasing the installation adaptability of the single battery.
Referring to fig. 2-5, the structure of the cover plate assembly 300 is shown in greater detail. Referring first to fig. 2-3, there are shown upper and lower isometric views of the cover plate assembly 300. The cover plate assembly 300 includes a top cover substrate 1 and a lower plastic 4, and the top cover substrate 1 and the lower plastic 4 are stacked together to form a plate shape. The top cover substrate 1 is fastened to both ends of the housing 100, and optionally, the cover plate assembly 300 is hermetically connected to the housing 100 by welding. The end face 42, far away from the top cover substrate, of the lower plastic 4 is abutted against the corresponding side face of the battery cell 200 and used for supporting and fixing the battery cell 200, and structures such as a retainer and the like are not needed to be additionally used for fixing the battery cell 200, so that the use safety of the single battery is improved, the space occupied by the retainer is reduced, the internal space utilization rate of the single battery is improved, and the density of the battery is improved;
the cover plate assemblies 300 further comprise pole plates, the pole plates are connected with the positive pole lug 201 or the negative pole lug 202, in this embodiment, the pole plate of one cover plate assembly 300 is connected with the positive pole lug 201, and the pole plate of the other cover plate assembly 300 is connected with the negative pole lug 202; the cover plate assembly 300 further comprises a pole post 2, and the pole post sequentially penetrates through the top cover substrate 1 and the lower plastic 4 and then is electrically connected with the pole plate 3. In this embodiment, through a polar plate 3 lug connection utmost point post 2 and anodal ear 201, another polar plate lug connection utmost point post and negative pole ear 202 avoid using soft connection structure to realize being connected of anodal ear 201 or negative pole ear 202 and utmost point post, reduce the use quantity of spare part, simplify the structure, convenient equipment.
The lower plastic 4 is made of an insulating material, and the insulating lower plastic 4 is arranged between the polar plate 3 and the top cover substrate 1 to ensure that the polar plate 3 is in insulating joint with the top cover substrate 1; specifically, the end face 42 is provided with a lower groove 41, and the polar plate is arranged in the lower groove 41, so that the polar plate is coated in the lower plastic 4, thereby further protecting the insulation between the polar plate 3 and the top cover substrate 1 and improving the safety performance of the battery; the end surfaces of the side walls of the lower plastic groove of the insulation lower plastic are abutted against the two ends of the battery cell 200, so that the battery cell 200 is supported and fixed, and the height of the single battery can be further reduced.
With continued reference to fig. 2 and 3, optionally, the cover plate assembly 300 further includes an explosion-proof valve 7, a connection hole 11 is opened on the top cover substrate 1, and the explosion-proof valve 7 is disposed on the connection hole 11. When the air pressure in the single battery is too high, the anti-explosion valve 7 is broken, the air pressure is released, the single battery is prevented from exploding, and the use risk is reduced. Optionally, the explosion-proof valve 7 is a metal sheet with a thickness of 0.4-0.6 mm; optionally, a scribed line is arranged on the metal sheet, and when the air pressure is increased, the metal sheet is broken along the weak part of the scribed line; in the embodiment, the metal sheet is welded on the connecting hole 11, the top cover substrate 1 is made of common materials, the metal sheet of the explosion-proof valve 7 is made of imported materials, and the material cost can be saved by welding connection; in other embodiments, the explosion-proof valve 7 and the top cover substrate 1 may be integrally formed, which can reduce the welding or other connection processes between the explosion-proof valve 7 and the top cover substrate 1, and simplify the process steps.
Optionally, the top cover substrate 1 is further provided with a liquid injection hole 12, after the casing 100, the battery cell 200 and the cover plate assemblies 300 on two sides of the single battery are mounted, electrolyte is injected into the single battery through the liquid injection hole 12, and then the liquid injection hole 12 is encapsulated through a metal sheet.
Optionally, the cover plate assembly 300 further includes a terminal 5 connected to the post 2, the terminal 5 is in insulation engagement with the top cover substrate 1, and the terminal 5 is disposed on a side opposite to the lower plastic 4. The terminals of the two cap plate assemblies 300 are disposed at both sides of the unit cell, respectively, so that the height of the unit cell can be reduced. The pole 2 penetrates through the top cover substrate 1 to be connected with the terminal 5, and the sealing performance between the top cover substrate 1 and the pole 2 can be improved through insulation joint; meanwhile, the terminal 5 and the top cover substrate 1 can be prevented from being connected with a short circuit, and the use safety is improved.
With continued reference to fig. 4-5, a cross-sectional view and an exploded view of the cover plate assembly 300 are illustrated, respectively. Specifically, the cover plate assembly 300 further comprises an insulating upper plastic 6, the upper plastic 6 is arranged between the terminal 5 and the top cover substrate 1, an upper groove 61 and a through hole are formed in the upper plastic 6, the pole column 2 penetrates through the through hole of the upper plastic 6, and the terminal 5 is installed in the upper groove 61. Both terminals 5 are mounted in the upper grooves 61, enabling the mounting height of the terminals 5 to be reduced, thereby reducing the height of the unit cell; meanwhile, the terminal 5 can be covered in the upper plastic 6, thereby improving the use safety.
The lower plastic 4 is provided with a lower groove 41 for mounting a polar plate, and the lower plastic 4 is contacted with the battery cell 200 through the end surfaces 42 around the lower plastic 4, so that the contact is stable; the cross sectional area of the lower plastic 4 is smaller than that of the top cover substrate 1, and the larger the cross sectional area of the lower plastic 4 is, the larger the contact area between the lower plastic 4 and the battery cell 200 is, and the more stable the support and fixation are; in addition, the area of the lower groove 41 is respectively larger than the areas of the positive tab 201 and the negative tab 202, so that the positive tab 201 and the negative tab 202 can be installed in the lower groove 41 to be connected with the pole plate; in comprehensive consideration, optionally, when the contact area occupies more than 5% of the area of the battery cell 200, both the contact smoothness and the good connection between the pole plates and the positive and negative electrode tabs 201 and 202 can be ensured.
Optionally, the cross section of the electrode plate 3 is rectangular, and the length-width ratio of the rectangle is greater than 2, so that the welding area between the positive electrode tab 201 or the negative electrode tab 202 and the electrode plate 3 is increased, the overcurrent capacity of the single battery is increased, and meanwhile, the welding area of the electrode plate 3 is increased, so that the battery pack is suitable for assembling a winding type tab or a lamination type tab, especially a full-tab battery cell 200, and has wide compatibility. For the full-lug type structure, the two sides of the full lug can be subjected to corner cutting treatment, the width of the full lug is ensured to be smaller than that of the pole plate 3, subsequent welding is facilitated, and the cut part of the full lug cannot be too large in order to ensure certain large-current bearing performance.
Alternatively, the cell includes multiple layers of positive tabs 201 and multiple layers of negative tabs 202, such that the multiple layers of positive tabs 201 and negative tabs 202 can be welded directly to the plate 3. Optionally, the multilayer positive tab 201 is attached by pressure or bound by an insulating film, and the multilayer negative tab 202 is attached by pressure or bound by an insulating film, so that the bending strength or hardness of the positive tab 201 and the negative tab 202 is enhanced, and the safety performance of the single cell is prevented from being affected by the damage of the positive tab 201 and the negative tab 202.
Optionally, the cover plate assembly 300 further includes a sealing member 8 disposed between the cover substrate 1 and the pole post 2 to seal between the cover substrate 1 and the pole post 2, so as to ensure the sealing effect of the cover plate assembly 300; optionally, the sealing element 8 is a sealing ring which is sleeved on the pole 2 and penetrates through the top cover substrate 1, and the sealing structure is simple, convenient to install and good in sealing performance.
Optionally, the terminal 5, the upper plastic 6, the top cover substrate 1, the lower plastic 4 and the pole plate 3 are provided with coaxial mounting holes, and are coaxially connected through the pole column 2, and the two ends of the pole column 2 are respectively fixedly connected with the terminal 5 and the pole plate 3, so that the cover plate assembly 300 forms a whole.
Optionally, the positive tab 201 and the negative tab 202 are respectively welded to the plate 3; alternatively, the positive electrode tab 201 and the negative electrode tab 202 are directly welded or riveted to the pole post 2, respectively. Optionally, the plate 3 is welded to the pole 2. Optionally, the manner of welding the connection includes one or more of laser welding, resistance welding, ultrasonic welding, rivet welding, or thermocompression welding.
Optionally, the unit cell further comprises a safety assembly for avoiding damage due to internal short circuits or the like of the unit cell. Optionally, the polar plate 3 is provided with two connection portions connected with the polar post 2 and the corresponding positive tab 201 or negative tab 202, and at least one through hole is formed between the two connection portions; the cross section areas of the pole plates 3 are respectively reduced, when a short circuit occurs outside the single battery, the pole posts 2 are connected with the outside to trigger the internal short circuit and generate instantaneous large current, so that the pole plates 3 are fused at the through holes, and the internal current loop of the single battery is cut off; the more the number of the through holes, the smaller the cross-sectional area, the easier the fusing, but the number of the through holes cannot be too much, otherwise the structure of the polar plate 3 is unreliable.
Alternatively, the unit cell is a prismatic cell, and the case 100 and the top cover substrate 1 are made of a hard material; alternatively, the hard material comprises a metallic material such as aluminum, a non-metallic material such as a ceramic, or a hard engineering plastic material. Alternatively, the upper plastic 6 and the lower plastic 4 are made of a resin material.
The embodiment also provides a battery module, which comprises the single battery, wherein the single batteries are packaged together to be uniformly connected with the outside, so that the safety and the reliability of each single battery are improved, and the safety and the reliability of the battery module are improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The single battery comprises a battery cell (200) and a shell (100) arranged outside the battery cell (200), wherein a positive electrode lug (201) and a negative electrode lug (202) are respectively arranged on two sides of the battery cell (200), two ends of the shell (100) are respectively provided with an opening, and the single battery is characterized by further comprising two cover plate assemblies (300), wherein the two cover plate assemblies (300) are respectively arranged at the openings of the two ends of the shell (100) in a sealing manner; the cover plate assembly (300) comprises:
a top cover substrate (1);
the polar plate (3) is arranged on one side of the top cover substrate (1) and is electrically connected with the positive pole lug (201) or the negative pole lug (202);
the lower plastic (4) is made of an insulating material and is arranged between the top cover substrate (1) and the polar plate (3), and the end face (42) of the lower plastic (4) far away from the top cover substrate (1) is abutted against the side face of the battery cell (200);
and the polar column (2) sequentially penetrates through the top cover substrate (1) and the lower plastic (4) and is electrically connected with the polar plate (3).
2. The cell according to claim 1, characterised in that the cross section of the plate (3) is rectangular and the aspect ratio of the rectangle is greater than 2.
3. The unit cell according to claim 1, wherein the cap plate assembly (300) further comprises an explosion-proof valve (7), a connection hole (11) is formed in the top cover substrate (1), and the explosion-proof valve (7) is disposed on the connection hole (11).
4. The cell according to claim 1, characterised in that the plate (3) is provided with two connections respectively connected to the pole (2) and to the corresponding positive tab (201) or negative tab (202), between which there is at least one through hole.
5. The cell of claim 1, wherein the cell comprises a plurality of attached positive electrode tabs (201) and a plurality of attached negative electrode tabs (202),
the plurality of layers of the positive electrode lugs (201) are bonded through pressure or through an insulating film;
the negative electrode tabs (202) are laminated by pressure or bound by an insulating film.
6. The cell according to claim 1, wherein the end face (42) has a lower groove (41) formed therein, the electrode plate (3) being disposed in the lower groove (41).
7. The cell battery according to any one of claims 1-6, characterized in that the cover plate assembly (300) further comprises a seal (8) disposed between the top cover substrate (1) and the terminal post (2).
8. The cell according to any one of claims 1 to 6, wherein the cap plate assembly (300) further comprises a terminal (5) connected to the post (2), the terminal (5) being in insulating engagement with the top cover substrate (1), the terminal (5) being disposed on a side opposite to the lower plastic (4).
9. The single cell battery according to claim 8, wherein the cover plate assembly (300) further comprises an insulating upper plastic (6), the upper plastic (6) is disposed between the terminal (5) and the top cover substrate (1), an upper groove (61) and a through hole are formed in the upper plastic (6), the post (2) passes through the through hole of the upper plastic (6), and the upper groove (61) is used for mounting the terminal (5).
10. A battery module comprising the unit cell according to any one of claims 1 to 9.
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| CN202010239412.6A CN111276732A (en) | 2020-03-30 | 2020-03-30 | Monomer formula battery and battery module |
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Application publication date: 20200612 |