CN208298922U - Lithium ion secondary batteries part and lithium ion secondary battery - Google Patents
Lithium ion secondary batteries part and lithium ion secondary battery Download PDFInfo
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- CN208298922U CN208298922U CN201820851870.3U CN201820851870U CN208298922U CN 208298922 U CN208298922 U CN 208298922U CN 201820851870 U CN201820851870 U CN 201820851870U CN 208298922 U CN208298922 U CN 208298922U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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Abstract
This disclosure relates to a kind of lithium ion secondary batteries part and lithium ion secondary battery, which includes pole piece and pole, is extended with tab on the pole piece；The welded connection that between the tab and the pole there is welding to be formed；The raised welding defect of welded connection；Polymer protective layer is covered on the surface of the welded connection, the thickness of the polymer protective layer is greater than or equal to the thickness of the welding defect of the protrusion, and the welding defect of the protrusion is embedded in the polymer protective layer.The component of the disclosure is by being arranged polymer protective layer on welded connection surface; the welding defect of protrusion can be made to be embedded in and be embedded in polymer protective layer; it effectively solves the problems, such as that the defect of protrusion pierces through diaphragm and battery safety is caused to reduce, improves the durability and stability of component and battery.
Description
Technical field
This disclosure relates to field of lithium ion secondary, and in particular, to a kind of lithium ion secondary batteries part and lithium from
Sub- secondary cell.
Background technique
Electrode cores collector foil needs to connect with what offer outside batteries were connect lithium ion secondary battery in the production process
Head welds, this process is more complicated in power battery, can there is multiple welding sequences, such as collector foil tab
Prewelding, foil tab be welded together with the piece that is flexible coupling, the welding etc. of be flexible coupling piece and battery cover board.These processes at present
The modes such as ultrasonic welding or laser welding are mostly used, some welding slags, burr etc. can be generated in the welding process to battery security
The defect to cause a hidden trouble.Insulating cement is pasted in these high risk zones after usually taking dedusting in current battery for promotion safety
The mode of cloth or high-temperature insulation adhesive plaster.
This kind of product has the disadvantage in that first is that adhesive plaster electrolyte resistance improving soaking is poor, because the presence of weld seam causes
Metal surface is uneven, and adhesive plaster can not be fitted closely with metal surface, electrolyte be easy immerse adhesive tape inside, destroy adhesive tape with
The bonding of metal surface, causes adhesive tape to fall off, above-mentioned welding slag, hair after this kind of high risk area of the connector of welding is exposed
The structures such as thorn can endanger the security performance of battery.Second is that the certain larger or more sharp welding slag or burr structure in face can puncture glue
Cloth fails so as to cause the safeguard measure of rubberized fabric.
Utility model content
Purpose of this disclosure is to provide a kind of lithium ion secondary batteries part, which can prevent welding slag, burr etc. to lack
Exposure is fallen into, cell safety is endangered.
To achieve the goals above, disclosure first aspect provides lithium ion secondary batteries part, which includes pole piece
And pole, tab is extended on the pole piece；The welded connection that between the tab and the pole there is welding to be formed；Institute
State the raised welding defect of welded connection；Polymer protective layer is covered on the surface of the welded connection, it is described
The thickness of polymer protective layer is greater than or equal to the thickness of the welding defect of the protrusion, and the welding defect of the protrusion is embedded in
In the polymer protective layer.
Optionally, the welding defect Yu the polymer protective layer of the protrusion completely attach to.
Optionally, the welded connection includes the first welded connection；What the pole and the tab welding were formed
The first welded connection that the lead-out tablet and the tab welding that first welded connection or the pole stretch out are formed；It is described
First welded connection includes the tab side of the first welded connection；The polymer protective layer is covered on first welding and connects
On the surface of the tab side of socket part.
Optionally, which further includes connection sheet, and the welded connection includes that the second welded connection and third are welded
Interconnecting piece；One end of the connection sheet and the tab welding form second welded connection；The connection sheet it is another
End is welded with the pole to be formed the other end of the third welded connection or the connection sheet and draws with what the pole stretched out
Slice welds to form third welded connection；The third welded connection includes the connection sheet side of third welded connection；Institute
Polymer protective layer is stated at least to be covered on the double-sided surface of second welded connection and the third welded connection
On the surface of connection sheet side.
Optionally, the ratio of the thickness of the thickness and polymer protective layer of the welding defect of the protrusion be (0.1~
0.9): 1.
Optionally, the welded connection also has weld seam, and the polymer protective layer has to be extended into the weld seam
Filling protruding portion.
Optionally, which further includes insulating layer, and the insulating layer covers the polymer protective layer.
Optionally, the polymer protective layer is hot melt adhesive polymer protective layer, optic-solidified adhesive polymer protective layer and pressure
At least one of quick xanthan polymer protective layer.
Disclosure second aspect provides a kind of lithium ion secondary battery, which includes cover board and disclosure first aspect
The lithium ion secondary batteries part.
Through the above technical solutions, the lithium ion secondary batteries part of the disclosure passes through the welding company in tab and lead-out tablet
Polymer protective layer is arranged in socket part surface, can embed raised welding defect in welded connection and make its insertion polymerization
In object protective layer, to secure above-mentioned welding defect and make welded connection surfacing without protrusion, weldering is efficiently solved
It connects defect protrusion and punctures the problem of diaphragm causes battery safety to reduce；Polymer protective layer is soaked with electrolyte resistance simultaneously
It steeps, the characteristic of resistance to electrochemical oxidation-reduction, improves the durability and stability of component and battery.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is a kind of welded connection schematic cross-section of specific embodiment of the lithium ion secondary battery of the disclosure.
Fig. 2 is a kind of structural schematic diagram of specific embodiment of the lithium ion secondary battery of the disclosure.
Fig. 3 is a kind of side view (i.e. the left view of Fig. 2) of specific embodiment of the lithium ion secondary battery of the disclosure.
Fig. 4 is the structural schematic diagram of another specific embodiment of the lithium ion secondary battery of the disclosure.
Fig. 5 is side view (the i.e. left view of Fig. 4 of another specific embodiment of the lithium ion secondary battery of the disclosure
Figure).
Description of symbols
The welding defect of 1 polymer protective layer, 2 protrusion
3 pole, 4 lead-out tablet
5 connection sheet, 6 tab
7 pole piece, 8 battery cover board
9 insulating layer, 10 welded connection
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
In the disclosure, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower " typically refers to device and exists
It is upper and lower under normal operating condition." inside and outside " is for the profile of device itself.
As Figure 1-Figure 5, disclosure first aspect provides a kind of lithium ion secondary batteries part, which includes pole piece
7 and pole 3, tab 6 is extended on pole piece 7；The welded connection 10 that between tab 6 and pole 3 there is welding to be formed；Welding connects
The raised welding defect 2 of socket part 10；Polymer protective layer 1, polymer protection are covered on the surface of welded connection 10
The thickness of layer 1 is greater than or equal to the thickness of the welding defect 2 of protrusion, and raised welding defect 2 is embedded in polymer protective layer 1
In.
The lithium ion secondary batteries part of the disclosure in tab with the setting of the welded connection surface of lead-out tablet by polymerizeing
Object protective layer can embed raised welding defect in welded connection and be embedded in it in polymer protective layer, thus
Secure above-mentioned welding defect and make welded connection surfacing without protrusion, efficiently solve welding defect it is prominent puncture every
The problem of film causes battery safety to reduce；There is polymer protective layer electrolyte resistance to impregnate simultaneously, resistance to electrochemical oxidation-is gone back
Former characteristic, improves the durability and stability of component and battery.
According to the disclosure, polymer protective layer can partly or entirely cover welded connection, and preferably covering is welded to connect
The whole surface in portion, to improve the stability of welding portion.
As shown in fig. 4-5, in a kind of specific embodiment of the disclosure, welded connection may include the first welding
Interconnecting piece, the first welded connection can be the first welded connection of pole 3 and the welding formation of tab 6, or stretch for pole
The first welded connection that lead-out tablet 4 and the welding of tab 6 out is formed；First welded connection may include the first welded connecting
The tab side in portion, polymer protective layer 1 can be covered on the surface of tab side of the first welded connection.Wherein, the first weldering
The surface of the tab side of connection section refers in two main surfaces of the first welded connection, the main table of relatively close tab side
Face.
As shown in Fig. 2-Fig. 3, in another specific embodiment of the disclosure, which can also include connection sheet 5,
Welded connection may include the second welded connection and third welded connection；In this case, one end of connection sheet 5 can
The second welded connection is formed to weld with tab 6；The other end of connection sheet 5 can be welded with pole 3 forms third welding company
The welding of lead-out tablet 4 that the other end of socket part or connection sheet 5 can be stretched out with pole forms third welded connection；Third welding
Interconnecting piece may include the connection sheet side of third welded connection, and polymer protective layer can at least be covered on the second welded connecting
On on the double-sided surface in the portion and surface of the connection sheet side of third welded connection.Wherein, the connection sheet of third welded connection
The surface of side refers in two main surfaces of third welded connection, the main surface of relatively close connection sheet side.
According to the disclosure, in order to embed the welding defect of protrusion, the thickness and polymer of raised welding defect completely
The ratio of the thickness of protective layer can be (0.1~0.9): 1, preferably (0.3~0.6): 1.Wherein, the thickness of polymer protective layer
Degree refers to maximum gauge of the surface of polymer protective layer relative to polymer protective layer and the contact surface of welded connection, protrusion
The thickness of welding defect refer to maximum height of the welding defect on polymer protective layer thickness direction of protrusion, preferred
In thickness range, it can be further ensured that the welding defect of all protrusions of welded connection in component use process does not puncture this
Polymer protective layer plays the role of being effectively protected to pole piece component, reduces welding slag, burr puncture diaphragm leads to battery short circuit
Risk, promotes the safety of battery, but can rapid shaping protective layer, avoid the blocked up assembling for influencing pole piece component of protective layer and
Performance.
According to the disclosure, what the meaning of raised welding defect was well known to those skilled in the art, such as the weldering of protrusion
Connecing defect may include the burr and/or welding slag for protruding from the surface before the welding of tab and lead-out tablet.Preferably, burr and weldering
The maximum height of slag can be 50-800 μm, further preferably 50~500 μm.
According to the disclosure, welded connection can also have weld seam, and polymer protective layer can have to be extended into weld seam
Filling protruding portion improve protective layer and welded connection further to make polymer protective layer sufficiently be bonded welded connection
The binding force on surface.Wherein the meaning of weld seam is well known to those skilled in the art, that is, what is formed after welding connects lower than welding
The recess and at least one of groove and gap of socket part initial surface.Preferably, the depth of the weld seam can be 0~500
Micron, more preferably 30-300 μm, further preferably 30~150 μm.
Further, for the welded connection that adequately protects, defect exposure is prevented, in a kind of specific embodiment party of the disclosure
In formula, polymer protective layer can also cover at least partly tab and/or at least partly lead-out tablet；Alternatively, polymer protective layer
At least partly tab, at least partly lead-out tablet and at least partly at least one of connection sheet can also be covered.
According to the disclosure, in order to make polymer protective layer sufficiently wrap up and be bonded the welding defect of protrusion so that the protrusion
Welding defect is completely embedded into polymer protective layer, and in a kind of specific embodiment of the disclosure, polymer protective layer can be with
To pass through the polymer protective layer in the dispensing of welded connection surface or gluing formation.In this embodiment, dispensing or painting
Glue method can guarantee that polymer material comes into full contact with when with certain fluidity and is bonded surface and the protrusion of welded connection
Welding defect surface, and molding forms polymer protective layer in the state of keeping fitting, and thus obtained polymer is protected
Sheath can come into full contact with welded connection surface, reach the surface for contacting and being bonded the welding defect of protrusion to the greatest extent,
To improve polymer protective layer to the protecting effect of welded connection.
In order to further increase the cohesive force of protective layer and the welding defect of protrusion, prevent the welding defect of protrusion from using
Middle generation displacement, improves the durability of component, and in a kind of specific embodiment of the disclosure, raised welding defect can be with
Polymer protective layer completely attaches to, wherein completely attaching to the welding defect insertion polymer protection for the protrusion for referring to welded connection
Layer and metallography microscope under the microscope, in error range, all surface of raised welding defect completely and polymer application,
It is seamless between the surface and polymer of welding defect；Wherein it should be noted that being limited in certain inevitable process conditions
In the case where system, the surface of raised welding defect may also have a fixed gap, such as micro- gas between polymer protective layer
Bubble accounts for the feelings within the raised surface of welding defect and the 10% of polymer protective layer contact surface area in such void area
Under condition, still belong to the protection scope of the application.
According to the disclosure, in order to further increase the cohesive force of protective layer Yu welded connection surface, it is preferable that polymer
The molding shrinkage of the polymer of protective layer can be 1~4%, more preferably 1~3%, to avoid polymer mistake after molding
Divide and shrink, polymer protective layer and welded connection surface is caused to generate wide arc gap.The meaning of molding shrinkage is this field
Known to technical staff, i.e., material is before the forming (such as hot melt adhesive is under soaking condition, optic-solidified adhesive is when without illumination)
Size and molding after (such as hot melt adhesive solidify at curing temperatures after, optic-solidified adhesive is after illumination curing) form the ruler of product
The percentage of very little difference.The test method of molding shrinkage can with reference standard GB/T15585-1995 thermoplastic injection at
The measurement of type shrinking percentage carries out.
According to the disclosure, what the polymer of polymer protective layer can be conventional for this field, it is preferably able to electrolyte resistance leaching
It steeps, the polymer material of resistance to electrochemical oxidation-reduction.Further, in order to improve polymer protective layer to welded connection table
The polymer of the cohesive force in face, polymer protective layer preferably can have mobility under certain conditions and can be in item
Cured polymer material after part removal connects in order to be sufficient filling with polymer protective layer or be fitted into welding defect with welding
Socket part surface comes into full contact with to improving cohesive force, for example, in disclosure preferred embodiment, polymer protective layer can be with
It, can at least one of hot melt adhesive polymer protective layer, optic-solidified adhesive polymer protective layer and pressure sensitive adhesive polymer protective layer
It is selected as applying convenient and fast pressure sensitive adhesive polymer protective layer.Wherein in the embodiment that the component of the disclosure further includes connection sheet,
Connection sheet both ends are respectively equipped with polymer protective layer, and the polymer of two polymer protective layers can be identical or different, preferably phase
Together.
According to the disclosure, what the meaning of hot melt adhesive was well known to those skilled in the art, i.e., in certain temperature range its
The material that the physical states such as mobility vary with temperature and change, what the type of hot melt adhesive can be conventional for this field, preferably
The copolymer of polypropylene thermal melten gel, ethylene and/or propylene selected from random copolymerization and oxygen-containing alkene, polystyrene, styrene with
Butadiene copolymer, isoprene and butadiene copolymer, epoxy-modified styrene-butadiene-styrene and two
At least one of polyacids type polyamide hot.Above-mentioned preferred class of hot melt adhesive melting temperature and viscosity are suitable for melting temperature
Degree will not have an impact pole piece performance；Curing performance is good and electrolyte resistance impregnates, and can fill under the conditions of suitable mobility
Tap touching fitting welded connection surface, the protective layer and welded connection surface adhesiveness of formation are good and are convenient for coating operation.
The coating method of hot melt adhesive can be this field routine, such as dispensing or gluing.
According to the disclosure, what the meaning of optic-solidified adhesive was well known to those skilled in the art, i.e., it can consolidate under illumination condition
The material of change, optic-solidified adhesive can use the type of this field routine, such as ultraviolet cured adhesive and/or visible-light curing glue,
In a kind of specific embodiment of the disclosure, preferably optic-solidified adhesive is ultraviolet cured adhesive, to improve curing rate.Ultraviolet light
Solidification glue can be selected from the conventional kind of this field, and the preferred ultraviolet cured adhesive of the disclosure can be for selected from esters of acrylic acid purple
Outer optic-solidified adhesive, cycloaliphatic epoxy resin class ultraviolet cured adhesive, aliphatic epoxy resin class ultraviolet cured adhesive, aromatic ring
Oxygen resinae ultraviolet cured adhesive, bisphenol-A epoxy modified acroleic acid esters ultraviolet cured adhesive and epoxy novolac modified acroleic acid
At least one of esters ultraviolet cured adhesive.Above-mentioned preferred class of ultraviolet cured adhesive curing rate is fast, electrolyte resistance
Can have suitable viscosity and mobility well and in the molten state, be conducive to be bonded welded connection surface, improve protective layer
Cohesive force.
According to the disclosure, what the meaning and type of pressure sensitive adhesive can be well known to those skilled in the art, i.e., have to pressure
The adhesive of sensibility, usual pressure sensitive adhesive have certain fluidity under by pressure state, such as can be pressure-sensitive selected from rubber
Glue and resinae pressure sensitive adhesive, it is preferable that pressure sensitive adhesive can be pressure-sensitive selected from crosslinking acrylate class pressure sensitive adhesive, organic silicon
At least one of glue, polyurethanes pressure sensitive adhesive and rubber pressure sensitive adhesive.Above-mentioned preferred class of pressure sensitive adhesive cohesive force is strong, uses
It is convenient, and there is good electrolyte resistance and resistance to chemical property, in addition, depositing due to pressure in pressure sensitive adhesive use process
, certain pressure can be generated to larger or higher welding slag, reduce its height, effectively avoid the appearance of extremely larger welding slag,
Ensure that protective layer is smooth；Meanwhile after pressure sensitive adhesive compacting, revocation pressure, protective layer comes into force, and does not need in technical process
Heating device or light source are more advantageous to raising production efficiency.
In order to further enhance the security performance of component, in a kind of specific embodiment of the disclosure, which may be used also
To include insulating layer, insulating layer can also cover in tab, lead-out tablet and connection sheet with cover aggregation object protective layer and optionally
It is at least one.Insulating layer can contain the insulating materials of this field routine, it is preferable that insulating layer can for polypropylene insulation layer,
At least one of polyethylene layer and polyvinyl chloride insulation layer, the thickness of insulating layer can be 30~300 μm, preferably 30
~100 μm.It may be this field routine by the method that insulating layer is applied to polymer protective layer, such as by being bonded or covering
If method.In the embodiment that the component of the disclosure further includes connection sheet, two welded connection at connection sheet both ends are excellent
Choosing is respectively equipped with insulating layer, and with further, protection of the reinforcement to high risk zone, the welding defect for being better protected from protrusion is brought
Inferiority, promote the security performance of battery.
The preparation method of the lithium ion secondary batteries part of the disclosure may include steps of:
Tab welding on pole and is formed welded connection, the raised welding defect of welded connection by S1；
S2, the surface applied polymer of welded connection with form to be formed polymer protective layer and make protrusion welding lack
It falls into and is embedded in polymer protective layer, the amount of application of polymer is so that the thickness of polymer protective layer is greater than or equal to protrusion
The thickness of welding defect.
Disclosed method can be wrapped by the way that polymer protective layer is arranged on the welded connection surface of tab and lead-out tablet
Raised welding defect and it is embedded in it in polymer protective layer in slugging socket part, thus the position of fixed above-mentioned welding defect
Setting does not make its generate displacement, and makes the smooth no protrusion of weld part surface, efficiently solves that welding defect is prominent to be punctured diaphragm and draw
Play the problem of battery safety reduces；Simultaneously polymer protective layer there is electrolyte resistance to impregnate, resistance to electrochemical oxidation-reduction
Characteristic improves the durability and stability of component and battery.
According to the disclosure, this method may include that polymer protective layer is made partly or entirely to cover welded connection, preferably
Make the whole surface of polymer protective layer covering welded connection, to improve the stability of welding portion.
According to the disclosure, in order to make polymer protective layer sufficiently wrap up and be bonded the welding defect of protrusion so that the protrusion
Welding defect is completely embedded into polymer protective layer, in a kind of specific embodiment of the disclosure, forms polymer protective layer
Method can be for by the dispensing of welded connection surface or gluing.In this embodiment, dispensing or gluing method can
Guarantee that polymer material comes into full contact with when with certain fluidity and be bonded the surface of welded connection and the welding of protrusion lacks
Sunken surface, and molding forms polymer protective layer in the state of keeping fitting, thus obtained polymer protective layer can
It comes into full contact with welded connection surface, reach the surface for contacting and being bonded the welding defect of protrusion to the greatest extent, to improve
Protecting effect of the polymer protective layer to welded connection.
In a kind of specific embodiment of the disclosure, welded connection may include the first welded connection, this method
It may include: that tab welding is formed to the first welded connection on pole, or the lead-out tablet that tab welding is stretched out in pole
The first welded connection of upper formation；First welded connection may include the tab side of the first welded connection, in the first welding
Polymer is applied on the tab side surface of interconnecting piece to form polymer protective layer to form.
In another embodiment specific implementation mode, the component can also include connection sheet, can by connection sheet by pole with
Together, welded connection may include the second welded connection and third welded connection to tab welding, in this case,
This method may include: that one end of connection sheet is welded on tab to form the second welded connection；By the other end of connection sheet
It is welded on formation third welded connection on pole, or the other end of connection sheet is welded on the lead-out tablet of pole stretching and is formed
Third welded connection；Third welded connection includes the connection sheet side of third welded connection；In the second welded connection
Application polymer to form polymer protection to be separately formed on the double-sided surface and connection sheet side surface of third welded connection
Layer.
According to the disclosure, in order to embed the welding defect of protrusion, the thickness and polymer of raised welding defect completely
The ratio of the thickness of protective layer can be (0.1~0.9): 1, preferably (0.3~0.6): 1.Wherein, the thickness of polymer protective layer
Degree refers to the maximum gauge of the surface of polymer protective layer relative to the initial surface of welded connection, in preferred thickness range
It is interior, it can be further ensured that the welding defect of all protrusions of welded connection in component use process does not puncture polymer guarantor
Sheath plays the role of being effectively protected to pole piece component, and reduction welding slag, burr puncture diaphragm lead to the risk of battery short circuit, mentions
Rise battery safety, and can rapid shaping protective layer, avoid protective layer it is blocked up influence pole piece component assembling and performance.
According to the disclosure, what the meaning of raised welding defect was well known to those skilled in the art, such as the weldering of protrusion
Connecing defect may include the burr and/or welding slag for protruding from the initial surface of tab and lead-out tablet, wherein tab and lead-out tablet
Initial surface both refer to it is not welded before surface.
According to the disclosure, welded connection can also have weld seam, and it is possible to which applied polymer is made to enter to weldering
Protruding portion is filled to be formed in seam, further to make polymer protective layer sufficiently be bonded welded connection, improves protective layer and weldering
The binding force on connection section surface.Wherein the meaning of weld seam is well known to those skilled in the art, that is, is formed after welding low
In the recess and at least one of groove and gap of the initial surface of welded connection.
Polymer is applied again after handling it is possible to further the surface to welded connection, to improve polymer guarantor
The binding force of sheath, the method being surface-treated may include that this field is conventional, such as surface treatment may include that surface is carved
Erosion processing.Wherein, one or more of the preferable electrochemical etching of surface etching treatment, soda acid etching or oxidant etching,
Improve the binding force of metal and organic polymer.The present invention can also include carrying out before surface treatment to welded connection surface
Pretreatment, pre-processes the various processing being known to the skilled person, generally comprises and polished surface, cleaned.
According to the disclosure, in order to further increase the cohesive force of polymer protective layer Yu welded connection surface, it is preferable that
The molding shrinkage of the polymer of polymer protective layer can be 1~4%, more preferably 1~3%, to avoid after molding poly-
Object material excessive shrinkage is closed, polymer protective layer and welded connection surface is caused to generate wide arc gap.Molding shrinkage contains
Justice and test method are for example above.
According to the disclosure, what the polymer of polymer protective layer can be conventional for this field, it is preferably able to electrolyte resistance leaching
It steeps, the polymer material of resistance to electrochemical oxidation-reduction.Further, in order to improve polymer protective layer to welded connection
The polymer of cohesive force, polymer protective layer preferably can have mobility under certain conditions and can go in condition
Except rear cured material comes into full contact in order to be sufficient filling with protective layer or be fitted into welding defect with welded connection surface
To improve cohesive force, for example, polymer protective layer can be protected in disclosure preferred embodiment for hot melt adhesive polymer
At least one of sheath, optic-solidified adhesive polymer protective layer and pressure sensitive adhesive polymer protective layer, are further preferably applied just
Prompt pressure sensitive adhesive polymer protective layer.Wherein in the embodiment that the component of the disclosure further includes connection sheet, connection sheet both ends
Be respectively equipped with polymer protective layer, two polymer protective layers can be identical or different, it is preferably identical.
According to the disclosure, what the meaning of hot melt adhesive was well known to those skilled in the art, i.e., in certain temperature range its
The material that the physical states such as mobility vary with temperature and change, what the coating method of hot melt adhesive can be conventional for this field, example
Such as injection molding, hot pressing, spraying or coating.What the meaning of optic-solidified adhesive was well known to those skilled in the art, i.e., under illumination condition
Curable material, what the coating method of optic-solidified adhesive can be conventional for this field, such as injection molding, hot pressing, spraying or coating.Pressure
What the meaning and type of quick glue can be well known to those skilled in the art, i.e., there is the adhesive of sensibility to pressure, usually presses
Quick glue has certain fluidity under by pressure state.
In order to guarantee adhesive effect and convenient for operation, the operation of step S2 may include such as at least one of under type:
Mode a: it is coated with hot melt adhesive to be solidified on the surface of welded connection, and is formed by curing polymer protective layer；
Mode b: being coated with optic-solidified adhesive to be solidified on the surface of welded connection, and is formed by curing under illumination condition poly-
Close object protective layer；And
Mode c: so that pressure sensitive adhesive is covered the surface of welded connection in the state of applying pressure, then remove pressure, shape
At polymer protective layer.
Wherein, in mode a, the condition for being coated with the hot melt adhesive of molten condition can change in a big way, it is preferable that
The temperature of the hot melt adhesive of molten condition can be 100~180 DEG C, preferably 110-150 DEG C, viscosity can for 1000~
10000CP, preferably 1500~5000CP, cured temperature can be 20~25 DEG C, and curing time can be 0~30s, preferably
For 15~25s.
According to the disclosure, what the type of hot melt adhesive can be conventional for this field, further, applied to meet above-mentioned melting
The condition of cloth, hot melt adhesive can be preferably selected from atactic polypropylene hot melt adhesive, ethylene and or propylene and oxygen-containing alkene copolymerization
Object, polystyrene, styrene and butadiene copolymer, isoprene and butadiene copolymer, epoxy-modified styrene-fourth two
Alkene-at least one of styrol copolymer and dimeric acid type polyamide hot melt adhesive.Above-mentioned preferred class of hot melt adhesive melting temperature
Degree and viscosity are suitable for that melting temperature will not have an impact pole piece performance；Curing performance is good and electrolyte resistance impregnates, can be suitable
Fitting welded connection surface, the protective layer and welded connection surface adhesiveness of formation are come into full contact under the conditions of suitable mobility
Well and it is convenient for coating operation.
Wherein, in mode b, the wavelength and intensity of illumination can be selected according to the type of optic-solidified adhesive, this is this
Known to the technical staff of field, details are not described herein again.
Further, there is to guarantee optic-solidified adhesive before curing suitable mobility to allow it to sufficiently to be bonded,
Infiltrate or fill above-mentioned welding defect, it is preferable that the viscosity of optic-solidified adhesive can be 1000~5000CP, preferably 1000-
3000CP；Further, in order to guarantee production efficiency, the time of illumination can be 5~20s, preferably 10-15s.
According to the disclosure, optic-solidified adhesive can use the type of this field routine, such as ultraviolet cured adhesive and/or visible
Optic-solidified adhesive, in a kind of specific embodiment of the disclosure, preferably optic-solidified adhesive is ultraviolet cured adhesive, to improve solidification speed
Degree.Ultraviolet cured adhesive can be selected from the conventional kind of this field, and the preferred ultraviolet cured adhesive of the disclosure can be for selected from third
Olefin(e) acid esters ultraviolet cured adhesive, cycloaliphatic epoxy resin class ultraviolet cured adhesive, the solidification of aliphatic epoxy resin class ultraviolet light
Glue, aromatic epoxy resin class ultraviolet cured adhesive, bisphenol-A epoxy modified acroleic acid esters ultraviolet cured adhesive and epoxy novolac
At least one of modified acroleic acid esters ultraviolet cured adhesive.Above-mentioned preferred class of ultraviolet cured adhesive curing rate is fast,
Electrolyte resistance performance is good and has suitable viscosity and mobility in the molten state, is conducive to be bonded welded connection surface,
Improve protective layer cohesive force.
Wherein, in mode c, in order to guarantee bond effect, wherein the pressure applied can be 0.2~0.8MPa, preferably
For 0.4~0.6MPa.In this method one can be generated to larger or higher welding slag since there are pressure in pressure sensitive adhesive use process
Fixed pressure reduces its height, effectively avoids the appearance of extremely larger welding slag；Meanwhile after pressure sensitive adhesive is compacted and removes pressure, gather
It closes object protective layer to come into force, heating device or light source is not needed in technical process, is more advantageous to raising production efficiency.
According to the disclosure, pressure sensitive adhesive can be selected from rubber pressure sensitive adhesive and resinae pressure sensitive adhesive, it is preferable that pressure sensitive adhesive can be with
For in crosslinking acrylate class pressure sensitive adhesive, organic silicon pressure sensitive adhesive, polyurethanes pressure sensitive adhesive and rubber pressure sensitive adhesive
It is at least one.Above-mentioned preferred class of pressure sensitive glueyness is strong, easy to use, and has good electrolyte resistance and resistance to electrochemistry
Performance.
Further, in order to improve the viscosity of pressure sensitive adhesive and to by the viscous good wettability of material, to improve protective layer
With the cohesive force on welded connection surface, in an embodiment of the present disclosure, pressure sensitive adhesive can be rubber pressure sensitive adhesive,
Middle rubber pressure sensitive adhesive is preferably modified butadiene acrylonitrile rubber；Further, in modified butadiene acrylonitrile rubber acrylonitrile unit member weight
Content can be 25%~50%, and molecular weight can be 10~300,000 (weight average molecular weight), to improve the intensity of pressure sensitive adhesive and glue
Tie power.
In order to further enhance the security performance of electrode assembly, in a kind of specific embodiment of the disclosure, this method
It may include: covering insulating material and to form insulating layer on polymer protective layer.Insulating materials can be this field routine,
Preferably insulate at least one of polypropylene, polyethylene and polyvinyl chloride；Insulating layer is applied to the side of polymer protective layer
Method may be this field routine, such as the method by being bonded or being arranged.It further include connection sheet in the component of the disclosure
In embodiment, this method may include that insulating layer is preferably respectively set in two welded connection at connection sheet both ends, to increase
Add the protection to high risk zone, further promotes the security performance of battery.
Disclosure second aspect provides a kind of lithium ion secondary battery, which includes cover board and disclosure first aspect
Lithium ion secondary batteries part.
The lithium ion secondary battery of the disclosure to welding slag existing for welded connection position, the isostructural high risk area of burr
Domain has carried out effective protection, can reduce that welding slag, burr pierces through diaphragm leads to the risk of battery short circuit, improves the safety of battery
Property.
According to the disclosure, the pole in the component of lithium ion secondary battery be can be set on the cover board, to be used for and dispatch from foreign news agency
Road connection, lead-out tablet can connect pole and extend on the inside of cover board, to weld with tab or the connection sheet connecting with tab.
It may include positive electrode and cathode component, preferably positive electrode in lithium ion secondary battery according to the disclosure
It is respectively the component of the disclosure with cathode component, to further increase the safety and stability of battery.
The disclosure is further described below by embodiment, but therefore the disclosure is not any way limited.At this
In disclosed following embodiment and comparative examples, shear strength uses GB/T 7124-2008 adhesive tensile shear strength measurement side
Method is tested, and the thickness of polymer protective layer is measured using metallographic microscope.
Embodiment 1
The present embodiment is for illustrating lithium ion secondary batteries part of the disclosure and preparation method thereof.
As shown in Figures 2 and 3, component includes pole piece 7, pole 3 and the connection sheet 5 of electrical connection, is extended with tab on pole piece 7
6, lead-out tablet 4 is extended on pole 3, the both ends of connection sheet 5 are welded respectively with tab 6 and lead-out tablet 4 to form two welding and connect
High molecular weight butyl rubber pressure sensitive glue (being purchased from ITW company, article number sm5190) is covered on by socket part under 0.6MPa pressure
Welded connection surface forms polymer protective layer 1, the maximum height and polymer of raised welding defect 2 after removing pressure
The ratio of the thickness of protective layer 1 is 0.5:1.
After the component is sealed in (80 DEG C) of electrolyte high temperature immersions 180 days, tests the polymer protective layer and impregnate front and back
Shear strength, the results are shown in Table 1.
Embodiment 2
The present embodiment is for illustrating lithium ion secondary batteries part of the disclosure and preparation method thereof.
Using the method for embodiment 1, the difference is that being stained with insulation polypropylene on polymer protective layer 1 forms insulating layer
9。
After the component is sealed in (80 DEG C) of electrolyte high temperature immersions 180 days, tests the polymer protective layer and impregnate front and back
Shear strength, the results are shown in Table 1.
Embodiment 3
The present embodiment is for illustrating lithium ion secondary batteries part of the disclosure and preparation method thereof.
Component includes pole piece, pole and the connection sheet of electrical connection, is extended with tab on pole piece, extraction is extended on pole
Piece, the both ends of connection sheet make hot melt adhesive (purchased from public in Australia respectively with tab and lead-out tablet welding to form two welded connection
Department, article number B03) (melt viscosity 2500CP) is melted at 160 DEG C afterwards coated on welded connection surface, normal temperature cure
Polymer protective layer is formed after 15s, with a thickness of 300 μm.
The component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, the polymer protective layer is tested and impregnates front and back
Shear strength, the results are shown in Table 1.
Embodiment 4
The present embodiment is for illustrating lithium ion secondary batteries part of the disclosure and preparation method thereof.
Component includes pole piece, pole and the connection sheet of electrical connection, is extended with tab on pole piece, extraction is extended on pole
Ultraviolet cured adhesive (is purchased from by piece, the both ends of connection sheet respectively with tab and lead-out tablet welding to form two welded connection
De Bang company, article number 703, viscosity 2000CP) it is coated on welded connection surface, after solidifying 10s under ultraviolet lighting
Polymer protective layer is formed, with a thickness of 250 μm.
The component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, the polymer protective layer is tested and impregnates front and back
Shear strength, the results are shown in Table 1.
Embodiment 5
The present embodiment is for illustrating lithium ion secondary battery pole piece component of the disclosure and preparation method thereof.
Using the method for embodiment 4, the difference is that being stained with insulation polypropylene on polymer protective layer forms insulating layer.
After the pole piece component is sealed in (80 DEG C) of electrolyte high temperature immersions 180 days, polymer protective layer immersion is tested
The shear strength of front and back, the results are shown in Table 1.
Embodiment 6
Using the method and material of embodiment 1, the difference is that the thickness of the maximum height of welding defect and pressure-sensitive adhesive layer
Ratio be 0.3:1.
The pole piece component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, before testing polymer protective layer immersion
Shear strength afterwards, the results are shown in Table 1.
Embodiment 7
As shown in Figure 4 and Figure 5, using the method and material of embodiment 1, the difference is that component does not include connection sheet, pole
It is extended with tab 6 on piece 7, lead-out tablet 4 is extended on pole 3, tab 6 and the welding of lead-out tablet 4 are to form welded connection.
The component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, the polymer protective layer 1 is tested and impregnates front and back
Shear strength, the results are shown in Table 1.
Embodiment 8
It is extended on pole piece using the method and material of embodiment 3 the difference is that pole piece component does not include connection sheet
Tab is extended with lead-out tablet on pole, and tab and lead-out tablet welding are to form welded connection.
The pole piece component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, before testing polymer protective layer immersion
Shear strength afterwards, the results are shown in Table 1.
Embodiment 9
Using the method for embodiment 8, the difference is that being stained with insulation polypropylene on polymer protective layer forms insulating layer.
After the pole piece component is sealed in (80 DEG C) of electrolyte high temperature immersions 180 days, polymer protective layer immersion is tested
The shear strength of front and back, the results are shown in Table 1
Embodiment 10
It is extended on pole piece using the method and material of embodiment 4 the difference is that pole piece component does not include connection sheet
Tab is extended with lead-out tablet on pole, and tab and lead-out tablet welding are to form welded connection.
The pole piece component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, before testing polymer protective layer immersion
Shear strength afterwards, the results are shown in Table 1.
Embodiment 11
Using the method and material of embodiment 8, the difference is that the thickness of the maximum height of welding defect and hot melt adhesive layer
Ratio be 0.3:1.
The pole piece component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, before testing polymer protective layer immersion
Shear strength afterwards, the results are shown in Table 1.
Comparative example 1
Using the method and material of embodiment 1, the difference is that (being purchased from 3M company article number by common insulating tape
471) it is attached to welded connection surface.
The component is sealed in (80 DEG C) of electrolyte high temperature to impregnate 180 days, the polymer protective layer is tested and impregnates front and back
Shear strength, the results are shown in Table 1.
Table 1
| Shear strength (before immersion, MPa) | Shear strength (after immersion, Mpa) | |
| Embodiment 1 | 0.90 | 0.86 |
| Embodiment 2 | 0.85 | 0.77 |
| Embodiment 3 | 1.40 | 1.25 |
| Embodiment 4 | 1.35 | 1.22 |
| Embodiment 5 | 1.45 | 1.35 |
| Embodiment 6 | 0.95 | 0.87 |
| Embodiment 7 | 1.00 | 0.90 |
| Embodiment 8 | 1.55 | 1.38 |
| Embodiment 9 | 1.54 | 1.36 |
| Embodiment 10 | 1.73 | 1.60 |
| Embodiment 11 | 1.58 | 1.40 |
| Comparative example 1 | 0.75 | 0.05 |
From the data in table 1, it can be seen that compared with the component (comparative example 1) for pasting common insulating tape, the lithium ion secondary of the application
The polymer protective layer of battery component all has higher shear strength before and after immersion, especially impregnates through electrolyte high temperature
Afterwards, the shear strength of the polymer protective layer of the application is not decreased obviously, and still is able to keep effective guarantor to welded connection
Shield, improves battery safety in utilization.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (9)
1. a kind of lithium ion secondary batteries part, which is characterized in that the component includes pole piece and pole, is extended on the pole piece
Tab；The welded connection that between the tab and the pole there is welding to be formed；The welded connection is raised
Welding defect；Polymer protective layer is covered on the surface of the welded connection, the thickness of the polymer protective layer is greater than
Or the thickness of the welding defect equal to the protrusion, the welding defect of the protrusion are embedded in the polymer protective layer.
2. component according to claim 1, which is characterized in that the welding defect and the polymer protective layer of the protrusion
It completely attaches to.
3. component according to claim 1, which is characterized in that the welded connection includes the first welded connection；
The lead-out tablet and the pole that the first welded connection or the pole that the pole and the tab welding are formed are stretched out
Ear welds the first welded connection to be formed；
First welded connection includes the tab side of the first welded connection；The polymer protective layer is covered on described
On the surface of the tab side of one welded connection.
4. component according to claim 1, wherein the component further includes connection sheet, and the welded connection includes second
Welded connection and third welded connection；One end of the connection sheet and the tab welding form described second and are welded to connect
Portion；
The other end of the connection sheet and the pole weld to form the another of the third welded connection or the connection sheet
The lead-out tablet that end is stretched out with the pole welds to form third welded connection；
The third welded connection includes the connection sheet side of third welded connection；
The polymer protective layer is at least covered on the double-sided surface of second welded connection and third welding connects
On the surface of the connection sheet side of socket part.
5. component according to claim 1, which is characterized in that the thickness and the polymer of the welding defect of the protrusion
The ratio of the thickness of protective layer is (0.1~0.9): 1.
6. component according to claim 1, which is characterized in that the welded connection also has weld seam, the polymer
Protective layer has the filling protruding portion extended into the weld seam.
7. component according to claim 1, which is characterized in that the component further includes insulating layer, and the insulating layer covers institute
State polymer protective layer.
8. component according to claim 1, which is characterized in that the polymer protective layer is hot melt xanthan polymer protection
At least one of layer, optic-solidified adhesive polymer protective layer and pressure sensitive adhesive polymer protective layer.
9. a kind of lithium ion secondary battery, which is characterized in that the battery includes any one of cover board and claim 1~8
The lithium ion secondary batteries part.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019228200A1 (en) * | 2018-05-31 | 2019-12-05 | 比亚迪股份有限公司 | Lithium ion secondary battery component and manufacturing method therefor, and lithium ion secondary battery |
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| WO2019228200A1 (en) * | 2018-05-31 | 2019-12-05 | 比亚迪股份有限公司 | Lithium ion secondary battery component and manufacturing method therefor, and lithium ion secondary battery |
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