CN104330738A - Cell capacity detection method and device - Google Patents
Cell capacity detection method and device Download PDFInfo
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- CN104330738A CN104330738A CN201410562685.9A CN201410562685A CN104330738A CN 104330738 A CN104330738 A CN 104330738A CN 201410562685 A CN201410562685 A CN 201410562685A CN 104330738 A CN104330738 A CN 104330738A
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Abstract
The invention discloses a cell capacity detection method and a device. the detection method is characterized in that the weight of the cell, the voltage and/or the internal resistance value serve as an important detection standard to detect whether the cell capacity is qualified; when the weight of the cell, the voltage and/or the internal resistance value meet the detection standard at the same time, the cell capacity is judged to be qualified; and when the weight of the cell, the voltage and/or the internal resistance value do not meet the detection standard, the cell capacity is judged to be unqualified. The traditional method of judging whether the cell capacity is judged through long-time charging and discharging test is abandoned, judgment is otherwise carried out through testing the weight of the cell and the voltage/ internal resistance value, the operation is simple and facilitated, accuracy of the operation is ensured, the detection efficiency is improved, and the detection time and the unit detection cost are greatly reduced; compared with the prior art, manpower, electric power and the use space can be greatly saved; and as the detection procedures and the processing procedures are integrated as one, the automation degree of an assembly line is greatly improved, manpower is reduced, and the detection efficiency and the processing efficiency are enhanced.
Description
[technical field]
The present invention relates to the detection of battery core capacity, particularly a kind of by the battery core capacity check method and apparatus of weight detecting as important criterion.
[background technology]
Lithium-ion electric core, before dispatching from the factory, according to the requirement of client, can detect and classification battery core capacity, voltage, internal resistance usually.Producer nearly all at present uses grading system equipment to carry out sorting to battery core capacity, and then manual or semi-automatic use voltage internal resistance test device carries out sorting to battery core.Grading system mainly relies on the long-time charge-discharge principle of battery core to carry out sorting to battery core capacity, it not only needs station more, and consuming time longer: first need manually battery core to be detected to be put into grading system one by one, the battery core putting into grading system needs 4 hours to complete partial volume, need after partial volume completes manually battery core to be taken off one by one, then could circulate to subsequent processing.In addition, use grading system to carry out partial volume, also there is the shortcoming that production cost is high: if be that 2000mAH battery core carries out partial volume to 10000 capacity simultaneously, need about 20 grading systems.With grading system 2.8 just in case the market price of platform calculates, completing this batch of detection then needs to spend about 560,000 element device moneys, takies the place of about 300 square meters.If using 1C as discharge and recharge standard when partial volume, the battery core of 10000 2000mAh then probably can produce the power consumption of 400 degree through the partial volume of 4 hours.As can be seen here, by charge-discharge test, traditional grading system judges that whether battery core capacity is qualified, not only detection time is long, is unfavorable for improving output, and testing cost is high, is unfavorable for cost-saving.
[summary of the invention]
The present invention is intended to solve the problem, and provide a kind of by weight parameter and voltage/internal resistance parameter as important examination criteria judge battery core capacity whether qualified battery core capacity check method and apparatus.
For achieving the above object, the invention provides a kind of battery core capacity check method, it is characterized in that, this method of testing using the weight of battery core, voltage and/or internal resistance value as detecting the whether qualified important examination criteria of battery core capacity, when the weight of battery core, voltage and/or internal resistance value meet examination criteria simultaneously, then judge that battery core capacity is qualified; If when the weight of battery core, voltage or internal resistance value do not meet examination criteria, then judge that battery core capacity is defective.
Described method of testing comprises weight detecting step and voltage and/or inner walkway step: the weight being measured battery core by weighing instruments, judges whether the weight of battery core meets the weight standard of the qualified battery core of capacity; Measure the voltage of battery core and/or internal resistance by voltage internal resistance test device, judge whether the voltage of battery core and/or internal resistance meet voltage, the internal resistance standard of the qualified battery core of capacity.
This method of testing extrapolates the weight of the battery core computing formula corresponding with between capacity by the weight of sampling measurement battery core and capacity, in described weight detecting step, the weight standard of battery core is determined by the value range of the qualified capacity of this computing formula and setting, when battery core measures weight by weighing instruments, judge that whether the capacity of this tested battery core is qualified by its weight.
This checkout equipment is provided with weight detecting platform and voltage/inner walkway platform, weight sensor is had at described weight detecting platform, voltage/inner walkway platform is provided with the voltage/inner walkway device that can detect battery core voltage and internal resistance, between described weight detecting platform and voltage/inner walkway platform, be provided with travelling belt, thus make battery core detect the underproof battery core of capacity fast by weight detecting platform and voltage/inner walkway platform.
Described checkout equipment is provided with control module, described weight detecting platform or travelling belt are provided with weight sorting device, described weight sensor and weight sorting device are connected with described control module respectively, when described weight sensor detects that the weight of battery core to be measured is defective, it to be linked described weight sorting device and underproof for this weight battery core to be measured is delivered to unacceptable product accumulator tank by described control module, when described weight sensor detects that the weight of battery core to be measured is qualified, this battery core to be measured is delivered to subsequent processing by described travelling belt.
Described voltage/inner walkway platform is provided with voltage/internal resistance sorting unit, described voltage/inner walkway device and voltage/internal resistance sorting unit are connected with described control module respectively, when described voltage/inner walkway device detects the voltage of battery core to be measured and internal resistance is qualified, these specification product are carried out sizing screening according to voltage/internal resistance by the described control module described voltage/internal resistance sorting unit that links by it.
Between described weight detecting platform and voltage/inner walkway platform, be provided with battery core auto film-coating device, veneering pad device and hot blast shrinkage apparatus successively, when the qualified battery core of weight detecting by travelling belt successively by being automatically packaged into mantle battery core when this battery core auto film-coating device, veneering pad device and hot blast shrinkage apparatus.
Described checkout equipment is provided with the hopper can throwing in some battery cores, the transfer structure that battery core can be sent to weight detecting platform is provided with between described hopper and weight detecting platform, be provided with in described hopper and can open and the separated material component of closing, this separated material component is connected with described control module, its can with detection beat opening or closing of rule and battery core is sent on weight detecting platform according to the order of sequence carry out weight measurement.
Described transfer structure is travelling belt, inclined slide plate or diversion trench.
This checkout equipment is provided with display device running status and shows the display screen of various detected parameters, and this display screen is connected with described control module, and when battery core is by weight detecting platform, this display screen shows the capacity of current battery core in real time.
Favorable attributes of the present invention is, it efficiently solves the problems referred to above.Abandoning tradition of the present invention judge by long-time charge-discharge test the method whether battery core capacity qualified, and judged by the weight detecting of battery core and voltage/inner walkway, it is simple, convenient operation not only, and detection efficiency can be improved while guarantee detection accuracy, greatly reduce detection time and unit testing cost.Compared to prior art, it can save manpower, electric power and usage space greatly.
[accompanying drawing explanation]
Fig. 1 is Method And Principle schematic diagram of the present invention.
Fig. 2 is device structure block diagram of the present invention.
[embodiment]
The following example is to further explanation of the present invention and supplements, and does not constitute any limitation the present invention.
Battery core capacity check method of the present invention mainly through detecting battery core weight, battery core voltage and/or resistance value as criterion, thus can judge that whether the capacity of battery core is qualified fast.
As everyone knows, the capacity of battery core refers under certain discharging condition, the electricity of the actual releasing of battery core.Therefore, the method that the assay method of conventional battery core capacity and cell discharge performance detect is basically identical, and it is mainly constant current discharge method: the capacity being calculated battery core by the size of discharge time and electric current.Discharge capacity and the discharge current of constant current discharge method have much relations, and charging system, time of repose etc. all can have impact to capacity, under same discharge system, the charge efficiency of different charging systems to battery is inconsistent, therefore, the discharge capacity of battery also can be had any different.Current international practice convention, adopts 0.2C to lead electric current and carries out charge-discharge test, industrial in order to save time, and general employing 1C leads and measures.Current employing discharge principle carries out volumetric determination to battery core and has become industry standard test, and testing apparatus is is also researched and developed, as grading system with this principle.Although the job specification of the volumetric determination of battery core existing standard in each factory site, but in factory's actual production process, the mensuration of battery core capacity, mainly in order to judge that whether battery core capacity is qualified, and electric discharge test is only one of its test mode, thus adopt traditional discharge principle test capacity whether qualified and nonessential means of testing.
In reality, frequent long-term experiment finds, if battery core weight meets the weight of qualified capacity battery core, then the capacity of this battery core substantially can judge qualified.Therefore, of the present invention is conveniently that the electric discharge principle of abandoning tradition is tested, and directly adopt the weight measurement of battery core as main criterion, by carrying out weight measurement to each battery core, and be aided with voltage/inner walkway and judge, if the weight of battery core, voltage and internal resistance value all can meet examination criteria, even if the actual capacity of each battery core directly can not be obtained, but also can this battery core capacity of indirect judgement qualified.Therefore, more accurately the qualified battery core of capacity can be filtered out faster by battery core weight measurement and battery core voltage/internal resistance measurement.
The present invention adopts battery core weight as follows as the theoretical foundation of main criterion: under theory state, if the composition of raw materials of preparation battery core is consistent, preparation technology is consistent, then the various performance parameters of the battery core prepared is also consistent.And in actual fabrication process, there is substandard product, mainly because a variety of causes such as limited precision of manually-operated error and plant equipment causes, there is error in the addition of such as positive electrode active materials, there is error etc. in the addition of electrolytic solution, cause homogeneity of product poor, thus occur the difference of performance.Therefore, by weighing the error degree of each step superposition, be availablely judge that whether product is qualified to a certain extent.And for battery core, the error of different manufacture craft before and after it, the error degree embodied through superposition, undertaken weighing by the weight of battery core and voltage/internal resistance, therefore, by the test of weight measurement and voltage, internal resistance, just can judge that whether the capacity of battery core is qualified to a certain extent.In addition, the design of battery is also using the grammes per square metre of various main material as foundation originally, as the grammes per square metre of positive electrode, negative material, electrolytic solution.Because other parts making battery use are identical, therefore, if the weight of assembling battery core out meets examination criteria, then illustrate that the capacity of battery core is also substantially up to standard.Such as, when positive electrode weight is partially light, the battery core weight finally produced is also partially light, and its battery core capacity just cannot reach Eligibility requirements.In like manner, when a certain material is laid particular stress on, the battery core capacity finally produced also cannot reach Eligibility requirements.For avoiding each own deviation of each material, and cause flase drop during general assembly (TW) bias free, as positive electrode is laid particular stress on, negative material is partially light, and both just neutralize by deviation of weight, is aided with voltage and inner walkway just can get rid of flase drop after weight detecting.Like this, the battery core that weight is qualified, if voltage and internal resistance all meet examination criteria, then this battery core capacity is qualified.If it is qualified to be only weight, and voltage and inner walkway defective, then battery core capacity is defective.As can be seen here, by weight detecting and voltage/inner walkway, just the underproof battery core of capacity accurately can be detected.Through experiment, use method of the present invention to carry out capacity check, its accuracy rate is up to more than 95%, and it meets commercial production demand substantially, and higher than using grading system to carry out the accuracy detected.
As shown in Figure 1, method of the present invention is in weight detecting process, and the examination criteria of weight can combine according to theoretical value the capability value sampled and determine.During concrete enforcement, conventional electric discharge first can be used to measure the capacity of the battery core that the same technique of use is produced, and carry out multiple sampling inspection, record the capacity of each battery core and the weight of correspondence thereof.Then make mathematically, as curve-fitting method, extrapolate the computing formula between the weight of battery core and capacity.By the computing formula extrapolated, and the qualified range of capacity of the battery core of setting originally, just can extrapolate the weight range corresponding to qualified capacity battery core, thus weight detecting standard can be determined.It should be noted that, the relation between the capacity of the battery core produced owing to using different formulations and preparation technology and weight is different, and therefore, for battery core prepared by different process and different formulations, it need sample respectively and extrapolate respective computing formula.Like this, grading system only need be used to carry out the sampling and testing in early stage, by the weight measurement of battery core, voltage and/or inner walkway, the later stage just directly can judge that whether battery core capacity is qualified, greatly simplify detecting step, and improve detection efficiency.
For convenience of carrying out battery core capacity check by weight measurement and voltage, inner walkway, the invention provides a kind of battery core capacity check equipment.As shown in Figure 2, this equipment is provided with weight detecting platform, voltage/inner walkway platform, travelling belt, weight sensor, control module, weight sorting device, voltage/internal resistance sorting unit, voltage/inner walkway device, display screen etc.
Particularly, have weight sensor at described weight detecting platform, this weight sensor is connected with control module.Be provided with weight sorting device at the periphery of described weight detecting platform, it is for being delivered to underproof for weight battery core in unacceptable product accumulator tank.Described weight sorting device is connected with described control module, and it can be various known weight sorting device.If this weight sorting device can be the plate pushing structure being arranged on weight detecting platform periphery, it is connected with control module, when weight sensor detects that the weight of current battery core does not meet examination criteria, current battery core is pushed to the unacceptable product accumulator tank being located at weight detecting platform periphery by its described plate pushing structure that links from the side.When weight sensor detects that the weight of current battery core meets examination criteria, battery core is sent to subsequent processing by travelling belt by it.In addition, according to different technological requirements, described weight sorting device also can be arranged to carry out Accurate Classification screening by quality to battery core.
For ease of stream line operation, before described weight detecting platform, be provided with hopper, it can several battery cores to be checked of disposable input detect.Between hopper and weight detecting platform, be provided with transfer structure, it carries out weight detecting for battery core is delivered to weight detecting platform from hopper.Described transfer structure can be travelling belt or the slide plate with certain angle of inclination.In described hopper, be provided with separated material component, this separated material component can open or close and battery core be flowed out in hopper.Described separated material component is connected with described control module, and it can regularly according to the transmission beat of whole piece streamline open or close under the control of the control unit, and the transporting velocity of battery core is coordinated mutually with detection speed.
Described voltage/inner walkway platform, for testing voltage and the internal resistance of battery core, which is provided with the voltage/inner walkway device that can detect battery core voltage and internal resistance.Described voltage/inner walkway device can be known battery core voltage/internal resistance test device.Described voltage/inner walkway platform is provided with voltage/internal resistance sorting unit, and this voltage/internal resistance sorting unit is connected with described control module.When described voltage/inner walkway device detects that the magnitude of voltage of current battery core and internal resistance value meet examination criteria, battery core qualified for this detection is carried out sizing screening according to voltage/internal resistance value by its described voltage/internal resistance sorting unit that links.Described voltage/internal resistance sorting unit can with reference to known separating structure, as it can be electromagnetic type, aspirated-air type, gripping-type mechanical arm, it captures battery core according to the test result of voltage/inner walkway device, current battery core is put into corresponding sorting groove, to complete sizing screening.In addition, existing voltage/inner walkway adopts the upright mode of battery core to detect usually, it is unstable that battery core is the vertical test process that easily makes, therefore, when the present invention carries out voltage/inner walkway to battery core, described battery core is that horizontal type stabilized receives detection on voltage/inner walkway platform, and it is convenient operation not only, and test is more accurate, and the serviceable life of testing needle can be improved.
Due in the later stage preparation process of battery core, not only need first to carry out capacity classification, also need veneering pad, cover heat shrinkage film etc., voltage, interior side test is carried out again after battery core being packaged into mantle battery core, therefore, for improving streamline detection efficiency, between described weight detecting platform and voltage/inner walkway platform, be provided with battery core auto film-coating device, veneering pad device and hot blast shrinkage apparatus successively.Described battery core auto film-coating device, veneering pad device and hot blast shrinkage apparatus are integrated in one and can provide automaticity, reduce the error brought of manual operation, and reduce glue in veneering pad process and, to the harm of operative employee, improve working (machining) efficiency simultaneously.When the qualified battery core of weight detecting to flow out and through described battery core auto film-coating device from weight detecting platform, upright battery core is sent to below the heat shrinkage film of auto film-coating device by travelling belt, auto film-coating device is automatically battery core mantle and is cut to corresponding length according to the size of battery core, then automatically the face pad without glue is placed on battery core top by veneering pad device, be delivered in hot blast shrinkage apparatus finally by travelling belt, by hot blast shrinkage apparatus, pyrocondensation encapsulation is carried out to the battery core being coated with heat shrinkage film, form mantle battery core, to carry out voltage/inner walkway.
For ease of display device running status and set various detected parameters, be provided with display screen on said device.Described display screen is connected with described control module, and when battery core is by weight detecting platform, described display screen can show the capacity of current battery core in time.
By this, battery core checkout equipment of the present invention is just defined.During use, first verify weight detecting platform and weight sensor, then battery core to be checked has been put into hopper, made battery core can enter weight detecting platform successively.Thereafter weight, voltage, internal resistance detection standard value is manually set by display screen.When battery core flows into weight detecting platform from hopper, weight sensor carries out weight detecting, and show its current capacities, interlock weight sorting device on a display screen by underproof for weight battery core rejecting streamline, the battery core making weight qualified is circulated to subsequent processing, and the underproof battery core of weight enters in unacceptable product accumulator tank.Thereafter equipment automatically mantle carried out to battery core, cut, pyrocondensation encapsulation, form mantle battery core.Mantle battery core is when superpotential/inner walkway platform, voltage/inner walkway device detects its magnitude of voltage and internal resistance value automatically, then voltage/internal resistance the sorting unit that links carries out classification and sorting, then enters into downstream and packs etc., automatically completes late detection and the processing technology of battery core with this.Use checkout equipment of the present invention and detection method, greatly can reduce time and the unit testing cost of battery core capacity check, compared to prior art, it can save manpower, electric power and usage space greatly: be the battery core of 2000mAh for 10000 capacity, use method of the present invention, then only need an equipment, about within 3 hours, just can complete by partial volume.And the floor area of equipment of the present invention is about: 3m2, power consumption is about 10 degree, in equal production efficiency situation, use the manufacturing cost of the equipment of the method lower, floor area greatly reduces, and energy consumption also reduces greatly, thus reduces the production cost of unit product.
Method of the present invention can detect that whether battery core capacity is qualified fast, it not only can be widely used on production line as entirely examining control device, judge that whether the battery core capacity produced is qualified, and can be used for the Incoming Quality Control using business, judge that whether the battery core capacity of supplied materials is qualified fast.In addition, it can be used for finished product detection or the sampling observation of battery.Detection method of the present invention is simply practical, can be applied to the relevant each field of battery core production as required.
Although by above embodiment to invention has been announcement, scope of the present invention is not limited thereto, and under the condition not departing from the present invention's design, above each component can be replaced with the similar or equivalent element that art personnel understand.
Claims (10)
1. a battery core capacity check method, it is characterized in that, this method of testing using the weight of battery core, voltage and/or internal resistance value as detecting the whether qualified important examination criteria of battery core capacity, when the weight of battery core, voltage and/or internal resistance value meet examination criteria simultaneously, then judge that battery core capacity is qualified; If when the weight of battery core, voltage or internal resistance value do not meet examination criteria, then judge that battery core capacity is defective.
2. battery core capacity check method as claimed in claim 1, it is characterized in that, described method of testing comprises the steps:
Weight detecting step: the weight being measured battery core by weighing instruments, judges whether the weight of battery core meets the weight standard of the qualified battery core of capacity;
Voltage and/or inner walkway step: measure the voltage of battery core and/or internal resistance by voltage internal resistance test device, judge whether the voltage of battery core and/or internal resistance meet voltage, the internal resistance standard of the qualified battery core of capacity.
3. battery core capacity check method as claimed in claim 2, it is characterized in that, this method of testing extrapolates the weight of the battery core computing formula corresponding with between capacity by the weight of sampling measurement battery core and capacity, in described weight detecting step, the weight standard of battery core is determined by the value range of the qualified capacity of this computing formula and setting, when battery core measures weight by weighing instruments, judge that whether the capacity of this tested battery core is qualified by its weight.
4. a battery core capacity check equipment, it is characterized in that, this checkout equipment is provided with weight detecting platform and voltage/inner walkway platform, weight sensor is had at described weight detecting platform, voltage/inner walkway platform is provided with the voltage/inner walkway device that can detect battery core voltage and internal resistance, between described weight detecting platform and voltage/inner walkway platform, be provided with travelling belt, thus make battery core detect the underproof battery core of capacity fast by weight detecting platform and voltage/inner walkway platform.
5. battery core capacity check equipment as claimed in claim 4, it is characterized in that, described checkout equipment is provided with control module, described weight detecting platform or travelling belt are provided with weight sorting device, described weight sensor and weight sorting device are connected with described control module respectively, when described weight sensor detects that the weight of battery core to be measured is defective, it to be linked described weight sorting device and underproof for this weight battery core to be measured is delivered to unacceptable product accumulator tank by described control module, when described weight sensor detects that the weight of battery core to be measured is qualified, this battery core to be measured is delivered to subsequent processing by described travelling belt.
6. battery core capacity check equipment as claimed in claim 5, it is characterized in that, described voltage/inner walkway platform is provided with voltage/internal resistance sorting unit, described voltage/inner walkway device and voltage/internal resistance sorting unit are connected with described control module respectively, when described voltage/inner walkway device detects the voltage of battery core to be measured and internal resistance is qualified, these specification product are carried out sizing screening according to voltage/internal resistance by the described control module described voltage/internal resistance sorting unit that links by it.
7. battery core capacity check equipment as claimed in claim 6, it is characterized in that, between described weight detecting platform and voltage/inner walkway platform, be provided with battery core auto film-coating device, veneering pad device and hot blast shrinkage apparatus successively, when the qualified battery core of weight detecting by travelling belt successively by being automatically packaged into mantle battery core when this battery core auto film-coating device, veneering pad device and hot blast shrinkage apparatus.
8. battery core capacity check equipment as claimed in claim 7, it is characterized in that, described checkout equipment is provided with the hopper can throwing in some battery cores, the transfer structure that battery core can be sent to weight detecting platform is provided with between described hopper and weight detecting platform, be provided with in described hopper and can open and the separated material component of closing, this separated material component is connected with described control module, its can with detection beat opening or closing of rule and battery core is sent on weight detecting platform according to the order of sequence carry out weight measurement.
9. battery core capacity check equipment as claimed in claim 8, it is characterized in that, described transfer structure is travelling belt, inclined slide plate or diversion trench.
10. battery core capacity check equipment as claimed in claim 8, it is characterized in that, this checkout equipment is provided with display device running status and shows the display screen of various detected parameters, this display screen is connected with described control module, when battery core is by weight detecting platform, this display screen shows the capacity of current battery core in real time.
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| CN201410562685.9A CN104330738A (en) | 2014-10-21 | 2014-10-21 | Cell capacity detection method and device |
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Application publication date: 20150204 |