CN102122706B - Method for injecting electrolyte into housing of battery - Google Patents
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- CN102122706B CN102122706B CN2011100312851A CN201110031285A CN102122706B CN 102122706 B CN102122706 B CN 102122706B CN 2011100312851 A CN2011100312851 A CN 2011100312851A CN 201110031285 A CN201110031285 A CN 201110031285A CN 102122706 B CN102122706 B CN 102122706B
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Abstract
The invention provides a method for injecting electrolyte into a housing of a battery, the battery is a lithium-iron disulfide battery, the housing comprises an open end and a closed end, an electric core is arranged on the inner side of the closed end, and the method comprises the first electrolyte injection step, wherein the first electrolyte injection step comprises the steps of decompressing the housing and injecting the electrolyte into the housing under the decompression state. The electrolyte is injected into the housing of the battery under the decompression state, thereby enabling the electrolyte to be fully absorbed on the electric core and an electrode piece and realizing the set discharge capacity as far as possible under high current discharge condition. On the other hand, by using the electrolyte injection method of the invention, the injection time of the electrolyte can be obviously shortened, and the production efficiency of the battery can be greatly improved.
Description
Technical field
The present invention relates to the disposable lithium-battery field, particularly relate to a kind of to lithium-iron disulfide (Li/FeS
2) the interior method of injecting electrolyte of battery container.
Background technology
Battery has become the necessity in people's life as a kind of small and exquisite portable power source easily.Lithium battery particularly, voltage platform is high, specific discharge capacity is high, the life-span is long, volume gently reaches the advantages such as pollution-free because it has, and has become the leading products of Battery Market at present.
In lithium battery, battery of lithium-iron disulphide is a kind of with FeS
2For positive electrode active materials, take metal Li as negative active core-shell material and the disposable lithium-battery take organic electrolyte as electrolyte, its operating voltage can reach 1.5V.Compare with alkaline battery, battery of lithium-iron disulphide has that specific discharge capacity is high, power output is large, cryogenic property is good, storage life is long and the advantage such as lightweight, therefore has been widely used in the mobile electronic devices such as notebook computer, video camera, digital camera.
Yet, the performance of battery of lithium-iron disulphide is at present also not fully up to expectations, particularly, in the situation that adopt heavy-current discharge, cell voltage reduces rapidly, cell voltage is reduced to below cut-ff voltage prematurely, and battery can't be kept daily available voltage for a long time, and then causes its theoretical discharge capacity can't all realize when reality is used.
At present, the main discharge capacity that improves battery by design and structure and the optimization positive electrode active materials etc. of improvement battery.But because the metal Li as the battery of lithium-iron disulphide negative active core-shell material is very active; belong to danger; the industry rule defines the maximum use amount of single battery; generally speaking; the metal Li of single AA type battery can not surpass 1 gram, and this has made restriction with regard to the heap(ed) capacity of giving battery of lithium-iron disulphide.
The task of electrolyte in battery is mainly to transmit electric charge by the migration of ion, thereby realize the normal operation of battery, particularly in the situation that heavy-current discharge, inside battery needs a large amount of electrolyte that enough ions are provided, to carry out charge transfer between battery plus-negative plate.And according to existing electrolyte method for implanting, the injection rate of electrolyte is few, and is difficult to fully be absorbed on battery core and electrode slice, therefore greatly reduces the actual discharge capacity of battery; In addition, because the viscosity of electrolyte is larger, the injection rate of electrolyte is restricted, and causes injection length to extend.
Someone proposes in (as being heated to 40-60 ℃) battery container that reinjects after the organic electrolyte heating, and with viscosity and the surface tension of reduction electrolyte, thereby the mobility of enhancing electrolyte promotes its absorption on battery core, improves the injection rate of electrolyte.But because organic electrolyte is volatile, the electrolyte actual constituent that often causes injecting battery changes, and needs seal operation, also will carry out heat treated, complex operation to pipeline and the battery container of electrolyte process.
Therefore, need at present a kind of method for implanting of battery of lithium-iron disulphide electrolyte badly, the method should be able to allow electrolyte fully absorb on battery core and electrode slice at short notice, increase the injection rate of electrolyte, thereby make battery as much as possible under the heavy-current discharge condition, can keep for a long time the discharge voltage of certain level, and then realize the discharge capacity that it is set.
Summary of the invention
Introduced the concept of a series of reduced forms in the summary of the invention part, this will further describe in the embodiment part.Summary of the invention part of the present invention does not also mean that key feature and the essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection range of attempting to determine technical scheme required for protection.
Based on above-mentioned technical problem, the invention provides a kind of electrolyte method for implanting that can allow electrolyte fully absorb in the short time on battery core and electrode slice.Specifically, the inventor adopts inject the method for electrolyte a kind of comprising by vacuumizing in battery container, thereby has completed the present invention.
The present inventor finds after deliberation, in the situation that heavy-current discharge, owing to producing the polarization phenomena that comprise electrochemical polarization and concentration polarization in battery, cause cell voltage to reduce rapidly, cell voltage is reduced to below cut-ff voltage prematurely, and in fact still there are a large amount of active materials that do not consume in inside battery.Wherein, electrochemical polarization often depends on the active material of electrode and the situation at electrode reaction interface, and namely active material obtains or lose the complexity of electronics at its electrode interface.Usually, can eliminate by structure and the performance of improving the solid electrolyte interface film, for example process by pre-arcing, perhaps add the additive that improves the solid electrolyte interface film to realize at inside battery.
In battery of lithium-iron disulphide due to the existence of metal Li, limited the use of aqueous electrolyte, and compare with aqueous electrolyte, the conductivity of organic electrolyte is very low, the degree of dissociation of the lithium salts that is dissolved in organic solvent is restricted, thereby do not provide the ion of enough free migrations, in addition, but the deficiency of the concentration of the viscosity of electrolyte, lithium salts etc. also causes the amount of ions of free migration not enough.Therefore, battery of lithium-iron disulphide is in the situation that heavy-current discharge, and the concentration polarization of battery often becomes leading factor.
In the manufacturing process of battery of lithium-iron disulphide, active material FeS
2Being coated on two sides of metal aluminum foil with graphite, acetylene black and binding agent etc., forming positive plate, is to reduce contact resistance, and positive plate need to pass through roll-in, so just causes electrolyte to be difficult to be penetrated in the micro-pore of pole piece, and moistening electrode surface only.In addition, the positive plate of battery, negative plate and the barrier film formation battery core of reeling together, contacting closely, battery core causes difficulty to interpolation and the absorption of electrolyte equally.Adopt commonsense method to add electrolyte, battery core central authorities or electrode mid portion often do not have electrolyte or seldom, the ion diffusion velocity is slow, cause in heavy-current discharge situation lower electrode surface and electrolyte bulk concentration variant, produce concentration polarization, cell voltage is reduced rapidly, greatly reduce the capacity of battery.
Yet, the present inventor is through unremitting effort, finally find, inject electrolyte by vacuumizing in battery container, electrolyte is absorbed on battery core and electrode slice fully, increase the injection rate of electrolyte, eliminate the concentration polarization of battery, and can shorten the injection length of electrolyte, thereby solved above-mentioned technical problem.
Specifically, the invention provides a kind of method of injecting electrolyte in the housing of battery, described battery is battery of lithium-iron disulphide, described housing has openend and blind end, the inboard of described blind end is provided with battery core, described method comprises the first fluid injection step, comprising: described housing is reduced pressure, inject described electrolyte in described housing under described decompression state.。
Under described decompression state, the absolute pressure in described battery container is less than 0.1MPa.Preferably, the absolute pressure in described battery container is less than or equal to 0.05MPa.More preferably, the absolute pressure in described battery container is less than or equal to 0.01MPa.Most preferably, the absolute pressure in described battery container is 0.002MPa-0.0001MPa.
Further, described the first fluid injection step is injected 1.8-1.9ml electrolyte, and injection length is 2-3 second.
Further, after described the first fluid injection step, described method also comprises makes the standing 1-3 of described housing second immediately, then seals immediately.This standing operation can make electrolyte be absorbed fully, and due to the mode that has adopted vacuum liquid filling, this soak time shortens compared to existing technology greatly.
In the preferred case, described electrolyte is the organic electrolyte that contains electrolyte lithium salt and organic solvent.
Preferably, described electrolyte lithium salt is LiI (lithium iodide), LiClO
4(lithium perchlorate), LiPF
6(lithium hexafluoro phosphate), LiSO
2CF
3One or more in (trifluoromethyl sulfonic acid lithium), LiTFSI (two fluoroform sulfimide lithium).
Preferably, described organic solvent is one or more in PC (propene carbonate), EC (ethylene carbonate), DME (dimethoxy-ethane), DX (dioxolanes), Sulfolane (sulfolane).
The present invention fully absorbs electrolyte by inject electrolyte in battery container under vacuum state on battery core and electrode slice, greatly increased and injected the amount of the electrolyte of inside battery, thereby eliminated the polarization phenomena of battery.Therefore, battery of the present invention can be realized the discharge capacity that it is set as much as possible under the heavy-current discharge condition under the prerequisite that does not change battery design and battery structure.On the other hand, use electrolyte filling method of the present invention, can obviously shorten the injection length of electrolyte, greatly improved the production efficiency of battery.
Description of drawings
Following accompanying drawing of the present invention is used for understanding the present invention at this as a part of the present invention.Shown in the drawings of embodiments of the invention and description thereof, be used for explaining principle of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that can implement the filling machine of method of the present invention.
Fig. 2 is the heavy-current discharge performance schematic diagram relatively that adopts the battery that vacuum liquid filling method (embodiment) and conventional electrolyte filling method (comparative example) make.
Embodiment
In the following description, a large amount of concrete details have been provided in order to more thorough understanding of the invention is provided.Yet, it will be apparent to one skilled in the art that the present invention can need not one or more these details and be implemented.In other example, for fear of obscuring with the present invention, be not described for technical characterictics more well known in the art.
As mentioned above, the invention provides a kind of method of injecting electrolyte in the housing of battery, described battery is battery of lithium-iron disulphide, described housing has openend and blind end, the inboard of described blind end is provided with battery core, described method comprises the first fluid injection step, comprising: described housing is reduced pressure, inject described electrolyte in described housing under described decompression state.
When injecting electrolyte, can use suitable seal that the openend sealing of battery container is reserved aspirating hole, then adopt vacuum extractor that housing is vacuumized, thereby reach the air in the pole piece hole in the extraction battery container, after the absolute pressure in battery container reaches desired value, use the electrolyte injection device to inject electrolyte in battery container, thereby complete the process of injecting electrolyte in the battery container.
The numerical value of the vacuum degree of middle shell of the present invention represents with absolute pressure, and absolute pressure value is less, and described vacuum degree is higher.Absolute pressure in described battery container should be less than 0.1MPa.Preferably, the absolute pressure in described battery container is less than or equal to 0.05MPa.More preferably, the absolute pressure in described battery container is less than or equal to 0.01MPa.Most preferably, the absolute pressure in described battery container is less than or equal to 0.002MPa.But, lower absolute pressure need to be equipped with expensive sealing device, and will make hull outside be subject to larger pressure, therefore, the absolute pressure in preferred described battery container is greater than 0.0001Mpa, so that when realizing optimum fluid injection effect, guarantee the safety of housing, and save cost.
Described vacuumizing can be used any device that can reach required vacuum degree, and unrestricted.Can comprise the instrument that accurately to measure vacuum values (absolute pressure) in battery container in described device, after the vacuum degree in battery container reaches desired value, close vacuum valve.When injecting electrolyte, because battery container is in high vacuum state, electrolyte will automatically be filled in battery container and hole under the promotion of ambient atmosphere.
Before vacuumizing, can use suitable seal with the openend sealing (i.e. isolated atmosphere) of battery container.Described seal can use any encapsulant, such as being the encapsulants such as rubber blanket, nylon cushion, silicagel pad.
For AA type battery, the first fluid injection step is preferably injected the electrolyte of 1.8-1.9 ml.According to above-mentioned method, the electrolyte that injects described consumption only needs 2-3 second.
After injecting electrolyte, electrolyte is fully absorbed on battery core and electrode slice, that is, after described the first fluid injection step, described method also comprises makes the standing 1-3 of described housing second immediately.Then, for fear of the volatilization of electrolyte, can seal immediately.The lasting several seconds of described absorption process (standing) gets final product.So both good assimilation effect can be reached, the total time of liquid injection process can be shortened again.
Described electrolyte method for implanting carries out secondary injection liquid before also can being included in sealing, namely, the electrolyte that described the first fluid injection step injection is set accounts for more than 90% and less than 100% of total electrolyte, then described method can also be included in before described sealing and carry out the second fluid injection step described after standing, wherein, inject described electrolyte in the mode that instils.Because using, the electrolyte in battery of lithium-iron disulphide of the present invention holds volatile organic electrolyte, be accomplished to battery seal from vacuum liquid filling and may need the regular hour, in order to make up the volatilization of electrolyte inside during this period of time, therefore can carry out fluid infusion (being the secondary fluid injection) before battery seal.But described secondary fluid injection process should not consist of limiting the scope of the invention, because as long as complete the process of injecting electrolyte in the battery container by vacuumizing, just can realize technique effect of the present invention.In addition, the secondary injection liquid measure should be controlled to be visible free electrolyte but not overflow battery container and be advisable.
About implementing the device of method of the present invention, filling machine 100 that can be shown in Figure 1.Wherein, this filling machine 100 has vacuum chamber 102, pore 103, base 104 and filling head 105, filling head 105 has liquid injecting mouth 106, wherein, vacuum chamber 102 is set to sealing state, only stays pore 103 and liquid injecting mouth 106 can be communicated with atmosphere, and it is (not shown that filling head 105 is communicated with fluid reservoir, be communicated with atmosphere), liquid injecting mouth 106 has valve.When implementing method of the present invention, battery 101 openends can be placed in the hole of base 104 fixing up, first close liquid injecting mouth 106, then utilize external vacuum extractor (not shown) to be evacuated in above-mentioned absolute pressure value scope by 103 pairs of vacuum chambers 102 of pore, subsequently, close pore 103, keep the vacuum state in vacuum chamber 102, liquid injecting mouth 106 is inserted into the openend of battery 101, then open the valve of liquid injecting mouth 106, utilize atmospheric pressure that the electrolyte of the scheduled volume in filling head 105 is pressed into battery 101(the first fluid injection step).Then, standing a period of time after can be with battery 101 taking out in the original place or with it (preferred 1-3 second).Can seal subsequently.If the electrolyte that the first fluid injection step is injected is set as less than the required total electrolyte content of battery, can carry out the second fluid injection step before sealing, that is, supply remaining electrolyte by common dropper in the mode that instils.
Electrolyte of the present invention can be normally used various organic electrolytes in battery of lithium-iron disulphide, and in general, described electrolyte contains electrolyte lithium salt and organic solvent.
Described electrolyte lithium salt can for being used for the various known lithium salts of lithium Fe battery electrolyte, for example can be preferably LiI (lithium iodide), LiClO
4(lithium perchlorate), LiPF
6(lithium hexafluoro phosphate), LiSO
2CF
3One or more in (trifluoromethyl sulfonic acid lithium), LiTFSI (two fluoroform sulfimide lithium) etc.
Described organic solvent can be the existing known various organic solvents that are used for lithium Fe battery electrolyte, such as being preferably one or more in PC (propene carbonate), EC (ethylene carbonate), DME (dimethoxy-ethane), DX (dioxolanes), Sulfolane (sulfolane) etc.
Can also comprise other additives in described electrolyte, for example can be preferably one or both in pyrimidine, DMI (3,5-dimethyl isoxazole).
Li/FeS of the present invention
2Battery can adopt common Li/FeS
2Battery structure, that is, and with FeS
2For positive electrode active materials, take metal Li as negative active core-shell material and take organic electrolyte as electrolyte, then insert barrier film between positive pole and negative pole.Preparation method as obtaining this battery structure can adopt method well known in the art, for example, and with FeS
2Powder and conductive agent (as graphite, acetylene black etc.) mix, stir to make anode sizing agent together with binding agent (as PTFE (polytetrafluoroethylene), PVDF (Kynoar), SEBS (triblock copolymer of epoxidation polystyrene-poly butadiene-polystyrene) etc.), solvent, anode sizing agent evenly is coated on conductive base (as metallic foil, wire netting etc.) again, after drying is removed solvent, again certain thickness is arrived in its roll-in, cut into and make the needed size of battery, obtain positive plate, stand-by after dry removal moisture.
Positive electrode active materials FeS as primary cell of the present invention
2, it both can take from Natural pyrite, marcasite, also can pass through the synthetic methods such as electro-deposition method, hydro thermal method manually synthetic, also can obtain MODIFIED Fe S by various modifications
2In other words, its concrete preparation method is not construed as limiting the present invention.Certainly, also can add other positive electrode active materials, together form the positive electrode active materials that is applicable to primary cell of the present invention.
Above-mentioned positive electrode active materials FeS
2Granularity can adopt common FeS as battery active material
2Particle size range commonly used, and unrestricted.
Above-mentioned positive electrode active materials FeS
2Crystal structure can be cubic type, pyritohedron type, octahedral build or other crystal formations, also can be the mixture of above-mentioned various crystal formations.In a word, FeS
2Crystal structure be not particularly limited.
Can add the other materials such as conductive agent (as graphite, acetylene black etc.) in positive electrode of the present invention, but in order to obtain good discharge performance, wherein active material FeS
2Part by weight should be more than 50%, more preferably more than 60%, further preferably more than 80%.
As the negative active core-shell material of primary cell of the present invention, can select the alloy foil of metal Li or Li and other metals.
Barrier film as primary cell of the present invention, micro-porous film be can be, PE (polyethylene), PP (polypropylene) or its combination are generally, typically, can directly use the barrier film of Celgard company, be the barrier film of Celgard2400, Celgard2500 etc. as model.
Then, above-mentioned positive plate, negative plate and barrier film can be wound into battery core together, after battery core is put into battery container, rolling line, welding, then inject electrolyte according to the method for the invention, sealing is carried out pre-arcing, thereby is obtained Li/ FeS after cleaning
2Battery.
The Li/FeS that does not contain electrolyte of the present invention
2Battery can also adopt other known preparation methods to make, and its preparation method does not consist of the restriction to protection scope of the present invention.
Embodiment
The present invention is further illustrated by the following examples.It should be noted that these embodiment do not consist of limiting the scope of the invention.
Preparation example
The related battery of the embodiment of the present invention is AA type battery, and its preparation method is as follows:
Get FeS
2Powder (picking up from the Natural pyrite of Yunfu, guangdong Province) mixes this material as positive electrode active materials with conductive agent (graphite and acetylene black), make positive mix.With an organic solvent binding agent is made adhesive glue, wherein, binding agent is styrene-ethylene/butylene-styrene block copolymer (SEBS, commodity are called Kraton G1651), organic solvent is the Shell A100 (aromatic hydrocarbon solvent) that produces of Shell company and the mixture of Shell OMS (isoparaffin), and its mixed proportion is the 4:6(weight ratio).
After being mixed by the weight ratio of 2:1 with adhesive glue, above-mentioned positive mix stirs to make slurry.In the dry of the anode sizing agent that finally makes, the part by weight of each component is:
FeS
2: 91 % by weight; Graphite: 6 % by weight; Acetylene black: 1 % by weight; The SEBS:2 % by weight.
This slurry is coated on aluminium foil as anodal conductive base, then the base material after applying is dried, roll-in, cut processing, obtain positive plate, its length is 285mm, and width is 41mm, and thickness is 0.2mm.Use lithium metal as negative plate, its length is 310mm, and width is 39mm, and thickness is 0.16mm; Then, an end of positive and negative electrode lug is connected to forms anode structure and negative pole structure on positive plate and negative plate respectively; Then, anode structure, negative pole structure and barrier film (Celgard 2400) superposeed and be wound on and form together the battery interlayer structure of (that is, form " negative pole/barrier film/positive pole/barrier film ... "); At last, battery is put into battery container, stand-by.
Electrolyte to be injected is the organic electrolyte of 1.2g/ml for the LiTFSI (two fluoroform sulfimide lithium) with 20 % by weight is dissolved in the density that forms in the mixed solvent (weight ratio is 4:1) of DOX and sulfolane.
Get 10 of the battery containers that does not contain electrolyte that preparation example obtains, the weighing battery weight, then be placed in the hole of base 104 of filling machine 100 as shown in Figure 1 fixing, close liquid injecting mouth 106, adopt vacuum extractor that vacuum chamber 102 is vacuumized, after vacuum degree reaches 0.002MPa, close vacuum valve and pore 103.Then liquid injecting mouth 106 is inserted into the openend of battery 101, opens the valve of liquid injecting mouth 106, inject 1.8ml electrolyte, the fluid injection time is 2 seconds.With standing 2 seconds of battery original place, so that its abundant Electolyte-absorptive.Battery is taken out.Adopt the mode that instils to carry out the secondary fluid injection to battery before sealing, reservoir quantity is that 0.02-0.06ml does not wait (specifically referring to table 1), and the liquid level of the electrolyte in the visible battery of result is higher than battery core, but does not overflow housing, wherein, make the liquid level of each sample substantially contour by regulating the secondary injection liquid measure.
Observe the electrolyte absorbing state of battery and also seal, and then weighing battery weight and calculate the electrolyte weight of injecting in each battery.Theoretical vacant volume in AA type battery of lithium-iron disulphide housing is pressed 1.95ml and is calculated, and obtains the fluid injection efficient of electrolyte method for implanting provided by the invention, the results are shown in Table 1.
Comparative example 1
Get 10 of the battery containers that does not contain electrolyte that preparation example obtains, electrolyte uses the electrolyte identical with embodiment 1, different is, adopt conventional method to inject electrolyte, namely inject under normal pressure, until the liquid level of electrolyte in housing reaches in embodiment 1 till the liquid level after the secondary fluid injection, the time used is about 30 minutes.After fluid injection is complete, make each battery that injects electrolyte fully absorb 30 minutes.Calculate the fluid injection efficient of the method, the results are shown in Table 1.
The fluid injection efficient of the conventional electrolyte filling method of table 1 and vacuum liquid filling method (the present invention) relatively
As can be seen from Table 1, adopt electrolyte method for implanting provided by the invention, fluid injection efficient can be up to 94.31%, apparently higher than the fluid injection efficient (54.06%) that adopts conventional method, greatly increase the amount of injecting the electrolyte of inside battery, thereby improved the discharge performance of battery in the heavy-current discharge situation.
In addition, the battery of above-described embodiment 1 and comparative example 1 is cut open, observed electrolyte in the infiltration situation of inside battery.Can find, in the battery of embodiment 1, electrolyte permeates on its pole piece evenly, and all there is no electrolyte in the middle part of the battery pole piece of comparative example 1, still keeps dry state.Illustrate and adopt electrolyte method for implanting provided by the invention, can make and obtain good absorption in the electrolyte short time on electrode slice.
Embodiment 2
The present embodiment is used for illustrating the discharge performance by the prepared battery of electrolyte method for implanting provided by the invention.
The battery that embodiment 1 is obtained carries out pre-arcing after cleaning, that is, after battery liquid-filling 3 hours, use the electric current constant-current discharge 6 minutes of 1200mA, obtain finished product Li/ FeS
2Battery.Use MACCOR 2300 cell testers, adopt 1500mW/650mW 2s On/28s Off, the ANSI DCAM mode of 5m/h to 0.9V, i.e. first pulse reaches 2 seconds at 1500mW, and second pulse subsequently reaches 28 seconds at 650mW, pulse train repeats 10 times, be the time of having a rest of 55 minutes subsequently, then repetition pulse sequence and time of having a rest to voltage drops to 0.9V, carries out respectively three tests, investigate the discharge performance of battery, the results are shown in Table 2.
Comparative example 2
The battery that comparative example 1 is obtained carries out pre-arcing after cleaning, that is, after battery liquid-filling 3 hours, use the electric current constant-current discharge 6 minutes of 1200mA, obtain finished product Li/ FeS
2Battery.Adopt the method identical with embodiment 2 to carry out the discharge performance test, the results are shown in Table 2.
According to above-mentioned discharge performance test result, take pulse number as abscissa, discharge voltage (V) is the ordinate mapping, relatively adopts the discharge performance of the battery that two kinds of different electrolyte filling methods make, as shown in Figure 2.
The discharge performance test result of the battery that two kinds of different electrolyte filling methods of table 2 employing make
Can find out from table 2 and Fig. 2, the battery that adopts electrolyte method for implanting provided by the invention to make, voltage platform is high when heavy-current discharge, and can keep for a long time the discharge voltage of certain level, can obtain desirable actual discharge performance.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just is used for for example and the purpose of explanation, but not is intended to the present invention is limited in described scope of embodiments.It will be appreciated by persons skilled in the art that in addition the present invention is not limited to above-described embodiment, can also make more kinds of variants and modifications according to instruction of the present invention, these variants and modifications all drop in the present invention's scope required for protection.Protection scope of the present invention is defined by the appended claims and equivalent scope thereof.
Claims (8)
1. method of injecting electrolyte in the housing of battery, described battery is battery of lithium-iron disulphide, described housing has openend and blind end, the inboard of described blind end is provided with battery core, described method comprises the first fluid injection step, comprising: described housing is reduced pressure, inject described electrolyte in described housing under described decompression state; After described the first fluid injection step, described method also comprises makes the standing 1-3 of described housing second immediately; The electrolyte that described the first fluid injection step is injected accounts for 90% or more and less than 100% of total electrolyte, carries out the second fluid injection step after standing before sealing and described, wherein, and with the mode that the instils remaining described electrolyte of injection in the described housing.
2. the method for claim 1, is characterized in that, under described decompression state, the absolute pressure in described battery container is less than or equal to 0.05MPa.
3. method as claimed in claim 2, is characterized in that, under described decompression state, the absolute pressure in described battery container is less than or equal to 0.01MPa.
4. method as claimed in claim 3, is characterized in that, under described decompression state, the absolute pressure in described battery container is 0.002MPa-0.0001MPa.
5. the method for claim 1, is characterized in that, described the first fluid injection step is injected 1.8-1.9ml electrolyte, and injection length is 2-3 second.
6. the method for claim 1, is characterized in that, described electrolyte is the organic electrolyte that contains electrolyte lithium salt and organic solvent.
7. method as claimed in claim 6, is characterized in that, described electrolyte lithium salt is one or more in lithium iodide, lithium perchlorate, lithium hexafluoro phosphate, trifluoromethyl sulfonic acid lithium, two fluoroform sulfimide lithium.
8. method as described in claim 6 or 7, is characterized in that, described organic solvent is one or more in propene carbonate, ethylene carbonate, dimethoxy-ethane, dioxolanes, sulfolane.
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| CN104518196B (en) * | 2013-09-27 | 2017-06-27 | 上海空间电源研究所 | Zinc-silver storage battery electrolyte vacuum automatic filling system and method |
| CN110061253B (en) * | 2019-03-04 | 2021-01-26 | 惠州亿纬锂能股份有限公司 | Button cell manufacturing equipment |
| CN113036221B (en) * | 2021-04-25 | 2022-10-21 | 天津市捷威动力工业有限公司 | Lithium ion battery with long circulation and high safety |
| CN117160828B (en) * | 2023-11-02 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Shell manufacturing method and equipment, shell, battery monomer, battery and electric equipment |
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| CN101212037A (en) * | 2006-12-31 | 2008-07-02 | 上海比亚迪有限公司 | Battery electrolyte filling method |
| CN101944585A (en) * | 2010-08-23 | 2011-01-12 | 八叶(厦门)新能源科技有限公司 | Injection method for lithium battery |
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| JP平10-334884A 1998.12.18 |
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