CN112490492A - Lithium ion battery and manufacturing method thereof - Google Patents
Lithium ion battery and manufacturing method thereof Download PDFInfo
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- CN112490492A CN112490492A CN202011353997.0A CN202011353997A CN112490492A CN 112490492 A CN112490492 A CN 112490492A CN 202011353997 A CN202011353997 A CN 202011353997A CN 112490492 A CN112490492 A CN 112490492A
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- lithium ion
- ion battery
- preset
- packaging
- battery
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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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
-
- 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 a lithium ion battery and a manufacturing method thereof, and relates to the technical field of batteries. The lithium ion battery includes: the battery comprises a battery core and a packaging component, wherein the packaging component is arranged on the outer side of the battery core, the packaging component is provided with at least one position port, each position port is filled with a preset part, and the preset parts are used for expanding when the temperature of the lithium ion battery exceeds a first preset temperature threshold value; the packaging component forms a containing cavity, the battery core is arranged in the containing cavity, the packaging component comprises N packaging edges, and at least one position opening is arranged on at least one packaging edge of the N packaging edges; the technical scheme provided by the invention solves the problems that the conventional lithium ion battery cannot dissipate heat in time under the condition of increased heat, so that the ignition is easy to happen and the safety performance is low.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium ion battery and a manufacturing method thereof.
Background
Because the lithium ion battery is formed by packaging aluminum films, the lithium ion battery has the advantages of light weight, high density and the like, and is popular with users. The existing lithium ion battery has strong sealing performance, can not dissipate heat in time under the condition of rising heat, is easy to generate fire, and has low safety performance.
Disclosure of Invention
The embodiment of the invention provides a lithium ion battery and a manufacturing method thereof, and aims to solve the problems that the conventional lithium ion battery cannot dissipate heat in time under the condition of increased heat, so that fire is easy to occur, and the safety performance is low.
In a first aspect, an embodiment of the present invention provides a lithium ion battery, including: the battery comprises a battery core and a packaging component, wherein the packaging component is arranged on the outer side of the battery core, at least one position port is arranged on the packaging component, a preset part is filled in each position port, the position port is used for indicating the filling position of the preset part, and the preset part is used for expanding when the temperature of the lithium ion battery exceeds a first preset temperature threshold value;
the packaging component forms a containing cavity, the battery cell is arranged in the containing cavity, the packaging component comprises N packaging edges, and the at least one position opening is formed in at least one packaging edge of the N packaging edges.
Optionally, the preset element is further configured to melt when the temperature of the lithium ion battery exceeds a second preset temperature threshold, where the second preset temperature is greater than the first preset temperature.
Optionally, the preset has an expansion rate greater than an expansion rate of the inner layer portion of the enclosure component.
Optionally, the package edge has a seal, the preset part has a length greater than or equal to a width of the seal, the seal is formed by fusing inner layer portions of the package component together, and the preset part and the package component are fused together.
Optionally, the tab of the battery cell is disposed on a target encapsulation edge, the target encapsulation edge is any one of the N encapsulation edges, the site opening is disposed at a center position of a first region of the target encapsulation edge, and the first region is a region where the target encapsulation edge overlaps with the tab.
Optionally, the width of the preset piece is smaller than the width of the tab glue of the tab.
Optionally, the width of the preset piece is 5% -70% of the width of the tab glue of the tab.
Optionally, the preset piece comprises a heat-sensitive material.
Optionally, the preset piece has a length of 1-15mm, a width of 0.5-2mm, and a thickness of 0.1-0.2 mm.
Optionally, the value range of the first preset temperature threshold includes 120-.
In the technical scheme provided by the embodiment of the invention, the lithium ion battery comprises a battery cell and a packaging component, at least one position opening is formed in the packaging component, and a preset part is filled in each position opening, wherein the preset part is used for expanding when the temperature of the lithium ion battery exceeds a preset temperature threshold value, after the expansion occurs, the sealing performance of the preset part is weakened, internal gas can break through the preset part, so that the position opening can communicate the internal space and the external space of the packaging component, a heat dissipation channel is formed through the position opening, the battery cell is timely dissipated, the heat and the pressure in the battery at high temperature are removed, and the safety performance of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a lithium ion battery provided in an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a lithium ion battery according to an embodiment of the present invention.
Description of the drawings:
101. an electric core; 102. a package member; 103. a preset.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
Referring to fig. 1-2, an embodiment of the invention provides a lithium ion battery, including: the lithium ion battery comprises a battery core 101 and a packaging component 102, wherein the packaging component 102 is arranged on the outer side of the battery core 101, at least one position opening is formed in the packaging component 102, a preset part 103 is filled in each position opening, and the preset part 103 is used for swelling and melting when the temperature of the lithium ion battery exceeds a preset temperature threshold value.
In this embodiment, the package member 102 may be made of a common package material, and the package member 102 made of the package material may be in the form of a package board, a package sheet, a package tape, etc., which are only used for illustration and are not limited herein, and alternatively, in other possible embodiments, the package member 102 may also be in other forms. Since the side surface of the battery cell 101 is square, in this embodiment, the battery cell 101 is encapsulated by an encapsulation plate with a certain thickness.
Specifically, in this embodiment, at least one bit port is provided on the package 102, for example, each package side of the package 102 may be provided with a bit port, or at least two bit ports may be provided on one package side of the package 102, and the specific number is set according to the actual application scenario, and in this embodiment, the case where one bit port is provided on one package side of the package 102 is described as an example. This is by way of example only and not by way of limitation.
Further, fill in the position mouth and preset 103, when the temperature of battery exceeded preset temperature threshold value, preset 103 took place the inflation, and when taking place the inflation back, the leakproofness of preset 103 weakens, and inside gas can break through preset for the position mouth can communicate the inner space and the exterior space of encapsulation part 102, forms heat dissipation channel through the position mouth. Further, when the temperature continues to rise, after the temperature rises from the first preset temperature threshold to the second preset temperature threshold, the preset part melts along with the rise of the temperature, so that the position opening can be fully exposed, and heat and pressure quickly accumulated in the battery are removed.
Optionally, the second predetermined temperature threshold is 125-.
Optionally, the value range of the first preset temperature threshold includes 120-.
In the technical scheme provided by the embodiment of the invention, the lithium ion battery comprises a battery cell 101 and a packaging component 102, at least one position opening is formed in the packaging component 102, and a preset part 103 is filled in each position opening, wherein the preset part 103 is used for swelling and melting when the temperature of the lithium ion battery exceeds a preset temperature threshold value. The filling of piece 103 also does not predetermine in the position mouth, and this position mouth can communicate the inner space and the exterior space of encapsulation part, forms heat dissipation channel through the position mouth, in time dispels the heat to electric core 101, gets rid of the inside heat and the pressure of battery under high temperature, promotes the security performance of battery.
Optionally, the package component 102 forms a receiving cavity, the battery cell 101 is disposed in the receiving cavity, the package component 102 includes N package edges, at least one position opening is disposed on at least one package edge of the N package edges, and N is a positive integer.
As shown in fig. 1, when the package member 102 is a rectangular parallelepiped, the package member 102 forms a housing cavity, and the battery cell 101 is housed in the housing cavity. Thus, a sealed space can be formed to enclose the battery cell 101, and the package member 102 has 4 package edges.
Optionally, the preset 103 has an expansion rate greater than that of the inner layer portion of the encapsulating member 102. In this way, the inner layer portion of the packaging component 102 can be ensured to have a better packaging function while the preset member 103 is expanded. The expansion rate in the invention is the ratio of the volume of an object heated to the same temperature to the volume of the object at normal temperature; such as the ratio of the volume of the same object heated to 100 c to its volume at 25 c.
Optionally, the package component 102 is composed of multiple layers of materials; the inner layer part of the packaging film comprises a polymer resin material; such as PP (polypropylene), PE (polyethylene), etc.
Optionally, a seal is present at the edge of the package, the length of the preset part 103 is greater than or equal to the width of the seal, the seal is formed by fusing inner layer portions of the package part 102 together, and the preset part 103 and the package part 102 are fused together. Thus, the sealing property of the sealing film can be ensured to be good.
Optionally, the tab of the battery cell 101 is disposed on a target encapsulation edge, where the target encapsulation edge is any one of the N encapsulation edges, the potential port is disposed at a center position of a first region of the target encapsulation edge, and the first region is a region where the target encapsulation edge overlaps the tab.
When the position opening is provided in the sealing member 102 located at the tab of the battery cell 101, if the sealing member 102 is provided in the area where the tab overlaps with the sealing member, the position opening is provided at the center of the overlapping area, so that the tab is not hindered from performing other wrapping operations.
Optionally, the material of the preset member 103 includes a heat sensitive material.
In one possible embodiment, the thermally sensitive material comprises polyethylene and a particulate material. Specifically, the thermosensitive material may be a composite material made of a compatible polymer system of Linear Low Density Polyethylene (LLDPE) or High Density Polyethylene (HDPE) as a matrix, and a particle material is added, and the thermosensitive material is stable and does not decompose and react with the electrolyte and the electrode, and in this embodiment, the thermosensitive material is used to expand and melt when the temperature of the lithium ion battery exceeds a preset temperature threshold.
Optionally, the width of the presets 103 is smaller than the width of the tab glue of the tab. And the width of the preset piece 103 is 5% -70% of the width of the tab glue of the tab. Among them, 5% to 35% is preferable. By selecting this range, it is possible to ensure that the tab adhesive and the encapsulating member 102 form a good seal.
In an alternative embodiment, the presets 103 are 1-15mm in length, 0.5-2mm in width, and 0.1-0.2mm in thickness. In order to fill the site opening of the encapsulation component 102 and not affect the normal encapsulation of the cell 101 by the encapsulation component 102, the preset element 103 needs to be made to just fill the site opening, that is, the size of the preset element 103 is determined according to the size of the site opening, and in this embodiment, the length of the preset element 103 is 1 to 15mm, for example, 8mm, the width is 0.5 to 2mm, for example, 1.5mm, and the thickness is 0.1 to 0.2mm, for example, 0.15 mm. The length, width or thickness of the preset member 103 can be adjusted within a certain range in other possible embodiments, but it is within the scope of the present invention to do any changes.
It should be noted that the specific manufacturing process of the lithium ion battery further includes steps of material preparation, coating, rolling, sheet making, housing of the battery cell 101, primary packaging, liquid injection, formation, secondary packaging, sorting, final inspection, and the like, and the steps are conventional steps, and are not described herein again.
Specifically, the packaging method of the lithium ion battery adopts a hot pressing method which is commonly used in the technology, for example, the hot pressing temperature is controlled at 170-200 ℃, the hot pressing time is 1-5S, the pressure is 0.1-1.0Mpa, and the packaging width is 1-15mm, so that the adhesive layer of two layers of aluminum plastic films (packaging components 102) and the thermosensitive material are bonded together, and the bonding tension of all positions of the aluminum plastic films after packaging is tested to be more than or equal to 2N/mm.
In one possible embodiment, the safety performance of the lithium ion battery including the battery can be tested, and the test specifically includes a heating process test and an overcharge process test. In the test, 7 sets of experiments are included, each set of experiments includes 5 lithium ion batteries, and the experiments are respectively performed according to whether the position opening is formed or not and the forming position of the position opening, and the experimental environment of each set is as follows.
In the experiment environment of the first set of experiments, taking the lithium ion battery with the tab at the same side of 67 × 164 × 230-30Ah as an example, in the set of experiments, after the battery cell 101 is placed into the case, the preset part 103 is placed for packaging. The battery cell 101 is placed in the molded aluminum-plastic film, and a position opening is formed in a top sealing area of the sealing component 102, where the position opening may be any position of the top sealing area, in this embodiment, since the top sealing area overlaps with a tab of the battery cell 101, the position opening is formed at a position opposite to the center of the positive tab of the battery cell 101, and the position opening is filled with the preset piece 103. And then, adopting the conventional hot-pressing packaging process, wherein the debugging packaging parameters comprise that the hot-pressing temperature is 200 ℃, the time is 3S, the pressure is 0.3Mpa, and the width of the packaging part 102 is 5mm, so that the glue layers of the two layers of aluminum plastic films and the anode lug glue are bonded together with the special material, and the bonding tension is more than or equal to 2N/mm after the packaging is tested. And then, obtaining a finished product lithium ion battery through liquid injection, formation, secondary packaging, sorting and final inspection, and then testing the safety performance of the lithium ion battery according to the technical requirements and the test method of the power storage battery for the electric vehicle, for example, GB/T31485-.
The specific process of the second set of experiments is referred to the first set of experiments, and is not described herein, but the difference is that the site port is arranged at the position corresponding to the center of the negative electrode tab of the battery cell 101, the debugging and packaging parameters are that the hot pressing temperature is 195 ℃, the time is 2.5S, the pressure is 0.25Mpa, the packaging width is 5mm, and the test result is classified as the second set of experiments. The specific process of the third group of experiments refers to the first group of experiments, and is not described herein any more, but the difference is that the position port is arranged at the middle position of the distance between the positive electrode tab and the negative electrode tab of the electric core 101, the debugging and packaging parameters are that the hot pressing temperature is 185 ℃, the time is 2.5S, the pressure is 0.3Mpa, the packaging width is 5mm, and the test result is classified as the third group of experiments. The debugging package parameters of the fourth group of experiments are consistent with those of the third group of experiments, and the difference is that the bit port is arranged at any position of the side edge package area, and the test result is classified into the fourth group of experiments. The debugging package parameters of the fifth group of experiments are consistent with those of the third group of experiments, and the difference is that the bit port is arranged at any position of the bottom edge package region, so that the test result is classified into the fifth group of experiments. The debugging and packaging parameters of the sixth group of experiments are consistent with those of the first group of experiments, and the difference is that the bit port is arranged at any position of the secondary packaging area, and the test result is classified into the sixth group of experiments. In the seventh experiment, the test results are classified into the seventh experiment without providing a site on the package 102 and without filling the preset part 103. It should be emphasized that the first encapsulation in this embodiment refers to performing the first encapsulation on the battery cell 101, and after the first encapsulation, one side surface is left without encapsulation, as shown in fig. 2, so as to perform liquid injection treatment on the battery cell 101, and after the liquid injection, perform the second encapsulation on the battery cell 101.
Specifically, the experimental results of the seven experiments are shown in table 1 below.
TABLE 1 test safety pass Rate for lithium ion batteries
As can be seen from table 1, the heating and overcharge pass rates of the lithium ion battery having the site provided on the encapsulation member 102 and the preset member 103 filled at the site were significantly improved compared to the comparative example in which the preset member 103 was not provided. The passing rate of the heating test is increased from 40% to 80%, and the passing test batteries are crevasse at the positions where the preset pieces 103 are installed; the passing rate of the overcharge test is improved from 20% to 60%, and the passing test batteries are all crevasse at the mounted passing rate position. In addition, the passing rate is arranged at the positive and negative pole tab glue positions of the top packaging area, so that the positive and negative pole tab glue positions are not easy to break completely, the positive and negative pole tab glue positions are arranged at the top packaging non-tab positions, the side packaging area and the secondary packaging area, so that the positive and negative pole tab glue positions are easy to break, the passing rate is high, and especially, the effect of mounting the positive and negative pole tab glue positions in the.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A lithium ion battery, comprising: the battery comprises a battery core and a packaging component, wherein the packaging component is arranged on the outer side of the battery core, at least one position port is arranged on the packaging component, a preset part is filled in each position port, the position port is used for indicating the filling position of the preset part, and the preset part is used for expanding when the temperature of the lithium ion battery exceeds a first preset temperature threshold value;
the packaging component forms a containing cavity, the battery cell is arranged in the containing cavity, the packaging component comprises N packaging edges, and the at least one position opening is formed in at least one packaging edge of the N packaging edges.
2. The lithium ion battery of claim 1, wherein the preset is further configured to melt when the temperature of the lithium ion battery exceeds a second preset temperature threshold, wherein the second preset temperature is greater than the first preset temperature.
3. The lithium ion battery of claim 1, wherein the preset has an expansion rate greater than an expansion rate of an inner layer portion of the packaging component.
4. The lithium ion battery of claim 1, wherein the package edge has a seal, the preset piece has a length greater than or equal to a seal width, the seal is formed by fusing inner layer portions of a package component together, and the preset piece and the package component are fused together.
5. The lithium ion battery of claim 1, wherein the tab of the battery cell is disposed at a target encapsulation edge, the target encapsulation edge is any one of the N encapsulation edges, the position opening is disposed at a center of a first region of the target encapsulation edge, and the first region is a region where the target encapsulation edge overlaps the tab.
6. The lithium ion battery of claim 5, wherein the width of the presets is less than the width of the tab glue of the tab.
7. The lithium ion battery of claim 6, wherein the width of the preset piece is 5% to 70% of the width of the tab glue of the tab.
8. The lithium ion battery of claim 1, wherein the predetermined material comprises a thermally sensitive material.
9. The lithium ion battery of claim 1, wherein the predetermined piece has a length of 1-15mm, a width of 0.5-2mm, and a thickness of 0.1-0.2 mm.
10. The li-ion battery of claim 1, wherein the first predetermined temperature threshold is in a range of 120-130 ℃.
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