CN108365136B - Battery cell packaging box, lithium battery and battery cell packaging method - Google Patents
Battery cell packaging box, lithium battery and battery cell packaging method Download PDFInfo
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- CN108365136B CN108365136B CN201810217673.0A CN201810217673A CN108365136B CN 108365136 B CN108365136 B CN 108365136B CN 201810217673 A CN201810217673 A CN 201810217673A CN 108365136 B CN108365136 B CN 108365136B
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- battery cell
- lateral wall
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- 238000000034 method Methods 0.000 title claims abstract description 78
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 61
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 23
- 238000007731 hot pressing Methods 0.000 claims abstract description 20
- 239000004033 plastic Substances 0.000 claims abstract description 13
- 229920003023 plastic Polymers 0.000 claims abstract description 13
- 150000001875 compounds Chemical class 0.000 claims abstract description 7
- 239000003792 electrolyte Substances 0.000 claims description 14
- 238000013329 compounding Methods 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 2
- 230000004308 accommodation Effects 0.000 claims 1
- 238000005538 encapsulation Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 10
- 238000007789 sealing Methods 0.000 abstract description 6
- 238000001746 injection moulding Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 13
- 239000002131 composite material Substances 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a battery cell packaging box, a lithium battery and a battery cell packaging method, wherein the battery cell packaging box comprises a box body and a cover body, the box body comprises a first bottom wall and a first side wall surrounding the periphery of the first bottom wall, one end of the first side wall, which is far away from the first bottom wall, is enclosed to form an open end, the cover body is detachably arranged at the open end to jointly define a containing cavity with the box body, the cover body is provided with an electrode outlet and a process opening which are respectively communicated with the containing cavity, and the box body and the cover body are made of plastics. The battery cell packaging box is light in weight because the box body and the cover body are made of plastic materials, can be used for packaging battery cells with different shapes by forming different shapes through injection molding, and can form a sealed accommodating cavity by rapidly sealing a gap between the box body and the cover body, an electrode outlet and a process port in a hot-pressing compound mode.
Description
Technical Field
The invention relates to the field of power supply devices, in particular to a battery cell packaging box, a lithium battery and a battery cell packaging method.
Background
Lithium batteries (Lithium batteries) refer to batteries that contain Lithium (including metallic Lithium, lithium alloys, lithium ions, and Lithium polymers) in an electrochemical system. Because of its excellent properties, it is widely used in various fields of human production and life. The lithium battery is generally composed of a battery core and a protection circuit board, wherein the battery core is used as an electric storage part of the lithium battery, and the performance and quality of the lithium battery are directly determined.
At present, three methods of cylindrical steel shells, square aluminum shells or aluminum plastic film soft packages are mainly adopted for packaging the battery cells of the lithium batteries. Among them, the packing method of the pure metal case increases the weight of the lithium battery, and the conductive case easily causes a short circuit of the lithium battery. The aluminum plastic film soft package relies on the high-strength aluminum plastic film to package the battery cell, so that the cost is high, the thicker single battery cell cannot be prepared due to the performance limitation of the aluminum plastic film, and the battery cell packaged by the method is easy to break when expanding, so that liquid leakage is generated.
Disclosure of Invention
Based on the above, it is necessary to provide a battery cell packaging box, a lithium battery and a battery cell packaging method capable of simultaneously satisfying the problems of light weight, low cost and difficult liquid leakage, aiming at the problem that the battery cell packaging of the lithium battery cannot simultaneously satisfy the problems of light weight, low cost and difficult liquid leakage.
The utility model provides a battery cell packaging box, includes box body and lid, the box body includes first diapire and encircles the first lateral wall of first diapire periphery, first lateral wall is kept away from first diapire one end encloses and closes and form the open end, the lid detachably install in the open end in order to with the box body defines jointly and holds the chamber, the lid is equipped with the intercommunication respectively hold electrode outlet and the technology mouth in chamber, the box body reaches the main part material of lid is plastics.
The battery cell packaging box comprises a box body, a cover body, an electrode outlet, an electrode, an electrolyte, a process port and an electrolyte injection port. The cell packaging box is light in weight because the box body and the cover body are made of plastic materials, and can be used for packaging cells with different shapes by injection molding, and a sealed accommodating cavity can be formed by rapidly sealing a gap between the box body and the cover body, an electrode outlet and a process port in a hot-pressing compound mode, so that the purposes of packaging the cells and avoiding leakage of the cell packaging box are achieved. In addition, compared with an aluminum plastic film, the price of the plastic material is lower, so that the manufacturing and using cost of the battery cell packaging box is reduced.
In one embodiment, the cover body includes a second bottom wall and a second side wall surrounding the periphery of the second bottom wall, the electrode outlet and the process port are both disposed on the second bottom wall, and when the cover body is mounted on the open end of the box body, the cover body is at least partially disposed in the box body, and the second bottom wall is disposed on one end of the second side wall, which is close to the first bottom wall, and is disposed in the box body.
In one embodiment, the second side wall is far away from one end of the second bottom wall and is provided with a supporting edge, the supporting edge extends from the second side wall to the direction away from the central axis of the cover body so as to support the box body, the first side wall is far away from one end of the first bottom wall and is provided with a supporting edge, and the supporting edge extends from the first side wall to the direction away from the central axis of the box body so as to support the supporting edge.
In one embodiment, the electrode outlet and the process port protrude from the second bottom wall along the extending direction of the second side wall, and the process port can be deformed in a recoverable manner under the action of pressure.
In one embodiment, the battery cell packaging box further comprises a protection layer, and the protection layer covers the inner wall and/or the outer wall of the box body and the cover body.
The lithium battery comprises the battery cell packaging box and the battery cell connected with the electrode, wherein the battery cell is contained in the containing cavity of the battery cell packaging box, and the electrode extends out of the containing cavity from the electrode outlet.
A method of packaging a battery cell, the method comprising the steps of:
the battery cell with the electrode is accommodated in an accommodating cavity defined by the box body and the cover body;
and the box body and the cover body are connected in a hot-pressing and compound mode.
In one embodiment, the method for packaging a battery cell further includes the steps of:
an electrode outlet for leading the electrode out of the cover body;
and (5) hot-pressing and compounding to seal the electrode outlet.
In one embodiment, the method for packaging a battery cell further includes:
vacuumizing the accommodating cavity through the process port of the cover body;
and (5) hot-pressing and compounding to seal the process port.
In one embodiment, the method for packaging a battery cell further includes:
piercing or shearing a process opening of the cover body and injecting electrolyte into the accommodating cavity;
and (5) hot-pressing and compounding to seal the process port.
Drawings
FIG. 1 is an exploded view of a battery cell package according to one embodiment;
FIG. 2 is a schematic diagram illustrating steps of a method for packaging a battery cell according to an embodiment;
FIG. 3 is a schematic diagram illustrating steps of a method for packaging a battery cell according to an embodiment;
FIG. 4 is a schematic diagram illustrating steps of a method for packaging a battery cell according to an embodiment;
FIG. 5 is a schematic diagram illustrating steps of a method for packaging a battery cell according to an embodiment;
FIG. 6 is a schematic diagram illustrating steps of a method for packaging a battery cell according to an embodiment;
fig. 7 is a schematic diagram illustrating steps of a method for packaging a battery cell according to an embodiment.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a battery cell package 100 according to the present preferred embodiment includes a case 20 and a cover 40. The battery cell packaging box 100 is used for packaging a battery cell (not shown) of a lithium battery, which is connected with a positive electrode and a negative electrode.
The case 20 includes a first bottom wall 22 and a first side wall 24 surrounding an outer periphery of the first bottom wall 22, and an end of the first side wall 24 away from the first bottom wall 22 is enclosed to form an open end. The cover 40 is detachably mounted at the opening end to define a receiving cavity with the case 20, and the cover 40 is provided with an electrode outlet 422 and a process port 424 respectively communicating with the receiving cavity. The main materials of the case 20 and the cover 40 are all plastics.
The above-mentioned battery cell package case 100, the case body 20 and the cover body 40 together define a receiving cavity for receiving the battery cell, the electrode connected to the battery cell can be extended through the electrode outlet 422 to be electrically connected to an external element, and the receiving cavity can be vacuumized and injected with the electrolyte through the process port 424. Because the case body 20 and the cover body 40 are made of plastic materials, the battery cell packaging case 100 has lighter weight, can be used for packaging battery cells with different shapes by injection molding, and can quickly seal the gap between the case body 20 and the cover body 40, the electrode outlet 422 and the process port 424 in a hot-pressing compound mode to form a sealed accommodating cavity, thereby achieving the purposes of packaging the battery cells and avoiding leakage of the battery cell packaging case 100. In addition, the plastic material is cheaper than the aluminum plastic film, so that the manufacturing and using costs of the battery cell packaging box 100 are reduced.
Referring again to fig. 1, the cross section of the first bottom wall 22 of the case 20 is rectangular, the first side wall 24 surrounds the periphery of the first bottom wall 22 to form a hollow shell structure, and the cross section of the first side wall 24 is rectangular frame-shaped. It is understood that in other embodiments, the shape of the case 20 is not limited thereto, and may be configured differently according to the shape of the battery cells. Further, the thickness of the first bottom wall 22 and the first side wall 24 is 0.5 to 6mm, and thus has a light weight while having sufficient mechanical strength. It is understood that the thicknesses of the first bottom wall 22 and the first side wall 24 are not limited thereto, and may be selected according to the size of the battery cell, the use environment, and the like.
The cover 40 includes a second bottom wall 42 and a second side wall 44 surrounding the outer periphery of the second bottom wall 42, wherein the cross section of the second bottom wall 42 is rectangular, the cross section of the second side wall 44 is also rectangular frame-shaped, and the electrode outlet 422 and the process opening 424 are both disposed on the second bottom wall 42. The orthographic projection of the second bottom wall 42 on the first bottom wall 22 is located within the first bottom wall 22, and when the cover 40 is mounted on the open end of the case 20, the cover 40 is located at least partially within the case 20 in the depth direction thereof, and the second bottom wall 42 is located at one end of the second side wall 44 adjacent to the first bottom wall 22 and within the case 20. Thus, when the battery cells packaged in the battery cell packaging box 100 generate gas, the second bottom wall 42 of the cover body 40 can deform in a direction away from the first bottom wall 22 under the pressure of the gas to effectively contain the gas and absorb the stress, so as to avoid the expansion deformation or even explosion of the box body 20. In the present embodiment, the second bottom wall 42 is a plane, and in other embodiments, the second bottom wall 42 may also have a cambered surface or a corrugated structure, so as to further improve the function of the cover 20 for accommodating gas.
In particular, in the present embodiment, the depth of the cover 40 (i.e., the distance between the second bottom wall 42 and the end surface of the second side wall 44 away from the end of the second bottom wall 42) is 2-20% of the depth of the case 20 (i.e., the distance between the first bottom wall 22 and the end surface of the first side wall 24 away from the end of the first bottom wall 22), so that the cover has sufficient deformation space and high structural strength. It is understood that the depth ratio of the cover 40 to the box 20 is not limited thereto, and may be set according to practical needs.
Further, an end of the second side wall 44 away from the second bottom wall 42 is provided with a holding edge 46, and the holding edge 46 extends from the second side wall 44 in a direction away from the central axis of the cover 40. Thus, the edge of the abutting edge 46 near one end of the first bottom wall 22 abuts against the edge of the box body 20, so that the cover body 40 is firmly mounted on the opening end of the box body 20, and the abutting edge 46 can be firmly connected with the edge of the box body 20 in a hot-pressing compounding manner. In particular, in this embodiment, the hot-press composite connection refers to heating two structures to be connected to a surface molten state and then cooling to form an integrated structure.
The end of the first side wall 24 away from the first bottom wall 22 is provided with a supporting edge 26, and the supporting edge 26 extends from the first side wall 24 towards the direction away from the central axis of the box body 20 to support the supporting edge 46 of the cover body 40. Therefore, the box body 20 and the cover body 40 have larger contact area so as to facilitate the hot-pressing compound connection, and the connection between the box body and the cover body is more stable.
The electrode outlet 422 and the process opening 424 protrude from the second bottom wall 42 in the extending direction of the second side wall 44, thereby facilitating the thermocompression bonding. In particular, in the present embodiment, the cross section of the electrode outlet 422 is in the shape of a hollow rectangular frame so as to facilitate the electrode to extend, and the cross section of the process port 424 is in the shape of a hollow circular ring so as to facilitate the connection of the vacuum pumping apparatus. Further, the process orifice 424 has a relatively high flexibility and is capable of undergoing recoverable deformation under pressure. Thus, the process opening 424 can be concaved and deformed inwards by vacuumizing to form a space in a negative pressure state, and when the gas generated in the cavity is contained, the process opening 424 can be deformed under the pressure of the gas so as to contain the gas. It is understood that the shapes of the electrode outlet 422 and the process port 242 are not limited thereto, and may be provided in different shapes as needed.
Specifically, the number of electrode outlets 422 is two, and the two electrode outlets 422 are arranged at intervals so that the positive electrode and the negative electrode can extend out. The process opening 424 is one, and the process opening 424 is located at one side of the two electrode outlets 422 and located between the two electrode outlets 422. In other embodiments, the positions of the electrode outlet 422 and the process port 424 are not limited thereto, and may be disposed at different positions of the second bottom wall 42 as required.
In an embodiment, the battery cell package 100 further includes a protection layer (not shown) covering the outer walls of the case 20 and the cover 40 to increase the mechanical strength of the battery cell package 100, and to prevent the battery cell package 100 from being damaged. Specifically, the protection layer may have a single-layer structure formed of a metal or the like, or may have a multi-layer composite structure including a metal layer to improve the mechanical strength of the battery cell package case 100. In other embodiments, a protective layer formed of metal may be covered with a plastic protective layer to provide further protection to the metal protective layer.
In one embodiment, the main materials of the case 20 and the cover 40 are polypropylene, which has excellent thermal properties (the service temperature can reach-30-140 ℃) and chemical stability, is resistant to most of acid and alkali corrosion, is insoluble in common solvents at normal temperature, and has low water absorption and excellent electrical insulation. In other embodiments, the main material of the case 20 and the cover 40 may be modified polyethylene, polytetrafluoroethylene, polyamide, polyimide or other plastic materials.
The above-mentioned cell packaging box 100, because the box body 20 and the cover body 40 are made of plastic, can have different shapes to match the cells with different shapes, and can be quickly sealed by a hot-pressing compound sealing mode to form a closed accommodating cavity to accommodate the cells, and can also be used for forming a vacuum environment by extracting vacuum through the process port 424 and injecting electrolyte into the accommodating cavity. Moreover, the second bottom wall 42 of the cover 40 can deform to contain the gas to absorb the stress, so as to avoid the deformation or explosion of the case 20 caused by the gas generated in the containing cavity. In addition, the battery cell package 100 is lighter in weight and has lower manufacturing cost.
As shown in fig. 1, a lithium battery includes the above-mentioned battery cell package 100 and a battery cell connected with an electrode, the battery cell is accommodated in an accommodating cavity of the battery cell package 100, and the electrode extends out of the accommodating cavity from the electrode outlet 422.
Thus, the electrode connected to the battery core can extend from the electrode outlet 422 to be electrically connected with an external element, and the electrode outlet 422 passing through the electrode is sealed in a hot-pressing compounding manner, so that external air is prevented from entering the accommodating cavity through a gap between the electrode and the electrode outlet 422.
The lithium battery has lighter weight because the battery cells are packaged in the battery cell packaging box 100 made of plastic, and the shape of the lithium battery is matched with that of the battery cells. In addition, the cell packaging box 100 can avoid larger deformation or explosion caused by the gas generated in the accommodating cavity, and has higher safety performance.
As shown in fig. 2, a method for packaging a battery cell includes the following steps:
s110: the battery cell with the electrode is accommodated in an accommodating cavity defined by the case 20 and the cover 40.
Specifically, in one embodiment, the battery cell with the positive and negative electrodes may be first placed into the case 20 matching the shape of the battery cell, and the electrodes may extend out of the open end of the case 20 for extraction. The cover 40 is then mounted to the open end of the case 20 to define a receiving chamber with the case 20, and the electrodes are protruded out of the electrode outlet 422 of the cover 40.
In another embodiment, a cell with positive and negative electrodes may be connected to the cover 40 and the electrodes may extend out of the electrode outlet 422 of the cover 40. Then, the cover 40 is mounted on the open end of the case 20, so that the battery cell is accommodated in the accommodating cavity formed by the case 20 and the cover 40.
S120: the cover 40 and the case 20 are thermally and compositely connected.
Specifically, the supporting edge 46 of the cover 40 abuts against the supporting edge 26 of the box 20, and the supporting edge 26 of the box 20 and the supporting edge 46 of the cover 40 are heated to a surface melting state and cooled, so that the supporting edge 46 and the supporting edge 26 form an integral structure, and air and other foreign matters are prevented from entering the accommodating cavity through the gap between the cover 40 and the box 20.
Further, after the pressing edge 46 and the supporting edge 26 are compounded by hot pressing, the pressing edge 46 and the supporting edge 26 are integrally bent upward to be in the same plane with the first side wall 24.
In an embodiment, the method for packaging a battery cell further includes the steps of:
s130: and hot-pressing the composite enclosed electrode outlet 422.
Specifically, the electrode outlet 422 is heated to a surface-melted state and then cooled, so that the electrode outlet 422 is closed to prevent space and other foreign substances from entering the accommodating chamber through the electrode outlet 422.
It should be understood that, although the steps in the flowchart of fig. 2 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. For example, as shown in fig. 3, step S130 may be located after step S120, and after the thermocompression bonding of the lid 40 and the case 20 is completed, the thermocompression bonding closes the electrode outlet 422; as shown in fig. 4, step S130 may also be performed between step S110 and step S120 to thermally press-compound the sealing electrode outlet 4122 before thermally press-compound the lid 42 and the case 20.
As shown in fig. 5, in an embodiment, in step S130: after hot pressing the composite enclosed electrode outlet 422, the method for packaging the battery cell further comprises:
s140: the receiving chamber is evacuated through the process port 424 of the cover 40.
Specifically, the process port 424 of the cover 40 is connected to a pipe of a vacuum-pumping device, through which the accommodating chamber is evacuated.
S150: the thermal compression composite closes the process orifice 424.
Specifically, the vacuum line of the vacuum pumping apparatus is disconnected, and the process port 424 is heated to a molten state and then cooled, so that the process port 424 is closed to maintain the vacuum state of the receiving chamber. Because of the high flexibility of the process orifice 424, recoverable deformation may occur under pressure. Thus, the process opening 424 can be concaved and deformed inwards by vacuumizing to form a space in a negative pressure state, and when the gas generated in the cavity is contained, the process opening 424 can be deformed under the pressure of the gas so as to contain the gas.
As shown in fig. 6, further, in step S150: after the thermal compression composite sealing process port 424, the method for packaging the battery cell further comprises:
s160: the process opening 424 is pierced or sheared to inject the electrolyte.
Specifically, the process opening 424 may be pierced with a needle of a syringe or the process opening 424 may be cut with scissors to inject electrolyte into the receiving chamber, thereby allowing a certain amount of electrolyte to be contained in the receiving chamber. It will be appreciated that in other embodiments, a solid electrolyte may be used instead of the electrolyte, thereby eliminating the need to inject the electrolyte into the receiving cavity, or to infiltrate the cells with the electrolyte before hot pressing the composite cover 20 and the case 40 into the case 20, and thus eliminating the need to re-inject the electrolyte.
S170: the thermal compression composite closes the process orifice 424.
Specifically, the process orifice 424 may be heated to a surface molten state and then cooled, thereby resealing the process orifice 424.
As shown in fig. 7, in an embodiment, step S160 and step S170 may also be located in step S130: after hot pressing the composite seal electrode outlet 424. In this embodiment, the process opening 424 may not be pierced or cut when the process opening 424 is opened before injecting the electrolyte.
In an embodiment, inert gas may be further filled into the accommodating cavity through the process port 424, so as to further improve the safety performance of the packaged battery cell.
The battery cell packaging method can quickly package the battery cell in the battery cell packaging box 100 and form a vacuum environment in the battery cell packaging box 100, and the packaging method is quick and simple, has a good sealing effect and avoids liquid leakage.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The utility model provides a cell encapsulation box, its characterized in that includes box body and lid, the box body includes first diapire and encircles first lateral wall of first diapire periphery, first lateral wall is kept away from first diapire one end encloses to close and forms the open end, lid detachably install in the open end with the box body jointly delimits and forms the accommodation chamber, the lid includes the second diapire and encircles the second lateral wall of second diapire periphery, when the lid install in the open end of box body, the lid is located at least partially the second lateral wall is located in the second lateral wall is close to first diapire one end and is located in the box body, the second lateral wall is kept away from second diapire one end is equipped with the butt limit, butt limit from the second lateral wall to deviate from the central axis direction of lid extend in order to support in the box body, the first lateral wall is kept away from the second lateral wall to deviate from the first lateral wall the central axis direction the second lateral wall is kept away from the second lateral wall is equipped with the second lateral wall and is kept away from the second lateral wall to support the central axis direction the second lateral wall is equipped with the second lateral wall and is equipped with the butt edge in the plastic process electrode holds the mouth.
2. The cell package of claim 1, further comprising a protective layer covering the inner and/or outer walls of the case and cover.
3. A lithium battery, characterized by comprising the battery cell packaging box according to any one of claims 1 or 2 and a battery cell connected with an electrode, wherein the battery cell is accommodated in the accommodating cavity of the battery cell packaging box, and the electrode extends out of the accommodating cavity from the electrode outlet.
4. A method for packaging a battery cell, for accommodating the battery cell in the battery cell packaging box according to claim 1 or 2, wherein the method for packaging the battery cell comprises the following steps:
the battery core with the electrode is accommodated in the accommodating cavity formed by the box body of the battery core packaging box and the cover body, and the electrode is led out of the electrode outlet of the cover body;
and the box body and the cover body are connected in a hot-pressing and compound mode.
5. The method of claim 4, further comprising the steps of:
and (5) hot-pressing and compounding to seal the electrode outlet.
6. The method of claim 5, further comprising:
vacuumizing the accommodating cavity through the process port of the cover body;
and (5) hot-pressing and compounding to seal the process port.
7. The cell packaging method according to any one of claims 5 or 6, further comprising:
piercing or shearing a process opening of the cover body and injecting electrolyte into the accommodating cavity;
and (5) hot-pressing and compounding to seal the process port.
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| CN201810217673.0A CN108365136B (en) | 2018-03-16 | 2018-03-16 | Battery cell packaging box, lithium battery and battery cell packaging method |
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| CN201810217673.0A CN108365136B (en) | 2018-03-16 | 2018-03-16 | Battery cell packaging box, lithium battery and battery cell packaging method |
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| CN108365136B true CN108365136B (en) | 2024-04-09 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU203592U1 (en) * | 2020-12-31 | 2021-04-13 | Общество С Ограниченной Ответственностью "Рэнера" (Ооо "Рэнера") | LITHIUM-ION BATTERY HOUSING |
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| CN108365136A (en) | 2018-08-03 |
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