CN109143103A - A kind of calculation method of battery pressure drop - Google Patents
A kind of calculation method of battery pressure drop Download PDFInfo
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- CN109143103A CN109143103A CN201811050287.3A CN201811050287A CN109143103A CN 109143103 A CN109143103 A CN 109143103A CN 201811050287 A CN201811050287 A CN 201811050287A CN 109143103 A CN109143103 A CN 109143103A
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Abstract
The present invention discloses a kind of calculation method of battery pressure drop, comprising the following steps: step S100, adjusts the battery for participating in test to fixed state-of-charge；Step S200, the initial open circuit voltage OCV0 of battery is recorded；Step S300, battery is placed at a temperature of first environment and is stored at the first time, and record the open-circuit voltage of battery at this time；Step S400, the corresponding open-circuit voltage OCVn that step S300 records battery respectively is repeated；Step S500, the pressure drop Δ V of battery is calculated according to the open-circuit voltage of record and draws matched curve.Pass through the battery pressure drop data under monitoring battery at certain time intervals, and then obtain the logarithmic function relationship of pressure drop and time, and draw out the matched curve of battery pressure drop, battery can be calculated in the voltage drop value of certain time using this matched curve, and then the length in battery pressure fall-off test period can be reduced, it solves the problems, such as just obtain battery pressure drop by testing for a long time, greatly reduced workload and the test period of tester.
Description
Technical field
The present invention relates to battery technology field more particularly to a kind of calculation methods of battery pressure drop.
Background technique
The voltage drop of battery changes with the variation of storage environment and storage time, before storing the phase, the pressure drop of battery
Decrease speed is very fast, and the change in pressure drop of phase battery will tend to be steady after storing, and pressure drop decrease speed slows down.In the prior art
In, it needs for a long time to be monitored the storing process of battery, records voltage value of the battery under different time, and then calculate list
The pressure drop of position time battery.In entire test process, need to take a substantial amount of time (usually to the pressure fall-off test needs of battery
3 months or longer time), and the larger workload of tester.
Summary of the invention
The purpose of the embodiment of the present invention is: providing a kind of calculation method of battery pressure drop, can reduce the testing time
Consumption.
In order to achieve the above object, the invention adopts the following technical scheme:
A kind of calculation method of battery pressure drop is provided, comprising the following steps:
Step S100, the battery for participating in test is adjusted to fixed state-of-charge；
Step S200, the initial open circuit voltage OCV0 of the battery is recorded；
Step S300, the battery is placed at a temperature of first environment and is stored at the first time；
Step S400, the battery is taken out, and records the open-circuit voltage of the battery at this time；
Step S500, it is repeated as many times the step S300 and step S400, obtains multiple open-circuit voltages；
Step S600, the difference for calculating two open-circuit voltages of the two neighboring first time record, obtains described
The pressure drop Δ V of battery simultaneously draws matched curve.
As a preferred technical solution of the invention, in the step S200, the described first of the battery is recorded
At a temperature of the battery is placed in second environment before beginning open-circuit voltage OCV0, shelved for the second time.
As a preferred technical solution of the invention, in the step S400, incited somebody to action before recording the open-circuit voltage
The battery is placed under third environment temperature, shelves the third time.
As a preferred technical solution of the invention, in the step S100 by the state-of-charge of battery adjust to
100% state.
It is at the first time 1-3 days as a preferred technical solution of the invention, described in the step S300.
As a preferred technical solution of the invention, the first environment temperature is 30 DEG C -70 DEG C.
As a preferred technical solution of the invention, second time is 3-6 hours.
As a preferred technical solution of the invention, the second environment temperature is 20 DEG C -30 DEG C.
As a preferred technical solution of the invention, the third environment temperature is 20 DEG C -30 DEG C.
As a preferred technical solution of the invention, in the step S600 the following steps are included:
Step S510, the difference for calculating two open-circuit voltages of the two neighboring first time record, obtains described
The pressure drop Δ V of battery；
Step S520, according to the pressure drop Δ V and time interval t when recording the open-circuit voltage draw pressure drop Δ V with
Time interval 1/t logarithmic relationship figure；
Step S520, it is fitted according to the logarithmic relationship figure and obtains fit equation；
Step S530, matched curve is drawn according to the fit equation.
The invention has the benefit that by the battery pressure drop data under monitoring battery at certain time intervals, and then
The logarithmic function relationship of pressure drop and time out, and the matched curve of battery pressure drop is drawn out, it can be calculated using this matched curve
Voltage drop value of the battery in certain time, and then the length in battery pressure fall-off test period can be reduced, solution must be by testing for a long time
The problem of capable of just obtaining battery pressure drop, greatly reduced workload and the test period of tester.
Detailed description of the invention
The present invention will be further described in detail below based on the drawings and embodiments.
Fig. 1 is the step schematic diagram of the calculation method of battery pressure drop described in the embodiment of the present invention.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
In the description of the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", " fixation " are answered
It is interpreted broadly, for example, it may be being fixedly connected, may be a detachable connection, or is integral；It can be mechanical connection,
It can be electrical connection；It can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary
Logical or two elements interaction relationship.For the ordinary skill in the art, can be understood with concrete condition above-mentioned
The concrete meaning of term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
As shown in Figure 1, in this present embodiment, a kind of calculation method of battery pressure drop of the present invention comprising following
Step:
Step S100, the battery for participating in test is adjusted to fixed state-of-charge；
Step S200, the initial open circuit voltage OCV of battery is recorded0；
Step S300, battery is placed at a temperature of first environment and is stored at the first time, and record the open circuit electricity of battery at this time
Pressure；
Step S400, battery is taken out, and records the open-circuit voltage of battery at this time；
Step S500, it is repeated as many times step S300 and step S400, obtains multiple open-circuit voltages；
Step S600, the difference for calculating two open-circuit voltages of two neighboring first time record, obtains the pressure drop Δ V of battery
And draw matched curve.
By the battery pressure drop data under monitoring battery at certain time intervals, and then obtain the logarithm letter of pressure drop and time
Number relationship, and the matched curve of battery pressure drop is drawn out, battery can be calculated in the pressure drop of certain time using this matched curve
Value, and then the length in battery pressure fall-off test period can be reduced, solution must can just obtain asking for battery pressure drop by testing for a long time
Topic, greatly reduced workload and the test period of tester.
By the voltage-drop data in monitoring battery one month, the functional relation of voltage drop and time are obtained, and then can count
Calculate the pressure drop of any time in battery 3 months.
In a preferred embodiment of the invention, in step s 200, the initial open circuit voltage OCV of battery is recorded0
It before further include at a temperature of battery is placed in second environment, shelving for the second time, it will be electric before step S400 records open-circuit voltage
Pond is placed under third environment temperature, shelves the third time.
Further, second environment temperature is equal with third environment temperature, is the fixed value between 20 DEG C -30 DEG C
(being all made of same temperature in entire test process, avoid error brought by temperature difference).When the second time and third
Between equal length, be that (length that the time is shelved in entire test process is all made of for a fixed value between 3-6 hours
Same time span avoids shelving error brought by time span difference).
By the way that battery is placed in same environment temperature and time interval before recording open-circuit voltage, may make locating for battery
State it is unified, avoid excessive influence factor from influencing the drop measurement precision of battery, improve the reliability of test.
In embodiments of the present invention, the state-of-charge of battery is adjusted to 100% state in step S100.
The initial state-of-charge for participating in the battery of test is adjusted to unified state before being tested, can avoid battery
State-of-charge the different pressure drops to battery influence, improve the reliability of test data.
It in embodiments of the present invention, is at the first time 1-3 days in step S300.
Preferably, during the test at the first time using 2 days open-circuit voltages as time interval record battery.
In embodiments of the present invention, first environment temperature is 30 DEG C -70 DEG C.
Preferably, in one embodiment, first environment temperature is 45 DEG C or 60 DEG C, fixed by the way that battery to be placed in
At a temperature of store, conducive to the stabilization of battery status, guarantee the reliability of test data.
In embodiments of the present invention, in step S600 the following steps are included:
Step S510, the difference for calculating two open-circuit voltages of two neighboring first time record, obtains the pressure of the battery
Δ V drops；
Step S520, pressure drop Δ V and time are drawn according to pressure drop Δ V and time interval t when recording the open-circuit voltage
It is spaced 1/t logarithmic relationship figure；
Step S520, it is fitted according to logarithmic relationship figure and obtains fit equation；
Step S530, matched curve is drawn according to fit equation.
Wherein, time interval t is the summation for adding the second time or third time at the first time.
By calculating corresponding voltage drop value to the battery open circuit voltage under different time points, the voltage drop value is then utilized
The logarithmic relationship of pressure drop and time is calculated, and draws out the logarithmic relationship number of pressure drop and time.Finally according to above-mentioned pair
Number relational graph draws battery pressure drop and the matched curve of time.It in actual use, can be bent according to the fitting finally drawn
Line computation goes out the voltage drop value of battery in different time points, to solve the problems, such as just obtain pressure drop by testing for a long time.
In one particular embodiment of the present invention, specifically includes the following steps:
Step S10, the battery for participating in test is adjusted to fixed state-of-charge；
Step S20,5h will be shelved under 25 DEG C of environment temperature that battery is placed in.
Step S30, the initial open circuit voltage OCV of battery is recorded0；
Step S40, battery is placed under 45 DEG C or 60 DEG C of environment temperature and is stored two days；
Step S50, battery is taken out and shelves 5h under 25 DEG C of environment temperature being placed in, and record the open circuit electricity of battery at this time
Pressure；
Step S60, the open-circuit voltage that step S40 and step S50 records the battery under different time respectively is repeated；
Step S70, the pressure drop Δ V of each time interval is calculated according to the open-circuit voltage of record；
Step S80, pressure drop Δ V and time interval 1/t logarithmic relationship figure are drawn according to pressure drop Δ V and time interval t；
Step S90, it is fitted according to logarithmic relationship figure and obtains fit equation；
Step S100, matched curve is drawn according to fit equation.
In the description of this article, it is to be understood that term " on ", "lower", " right side ", etc. orientation or positional relationships be based on
Orientation or positional relationship shown in the drawings is merely for convenience of description and simplification and operates, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.In addition, term " first ", " second ", are only used to distinguish between description, have no special meaning.
In the description of this specification, the description of reference term " embodiment ", " example " etc. means to combine the embodiment
Or example particular features, structures, materials, or characteristics described are included at least one embodiment or example of the invention.?
In this specification, schematic expression of the above terms be may not refer to the same embodiment or example.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the embodiments can also be appropriately combined, and forming those skilled in the art can
With the other embodiments of understanding.
The technical principle of the invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, the technology of this field
Personnel can associate with other specific embodiments of the invention without creative labor, these modes are fallen within
Within protection scope of the present invention.
Claims (10)
1. a kind of calculation method of battery pressure drop, which comprises the following steps:
Step S100, the battery for participating in test is adjusted to fixed state-of-charge；
Step S200, the initial open circuit voltage OCV of the battery is recorded0；
Step S300, the battery is placed at a temperature of first environment and is stored at the first time；
Step S400, the battery is taken out, and records the open-circuit voltage of the battery at this time；
Step S500, it is repeated as many times the step S300 and step S400, obtains multiple open-circuit voltages；
Step S600, the difference for calculating two open-circuit voltages of the two neighboring first time record, obtains the battery
Pressure drop Δ V and draw matched curve.
2. the calculation method of battery pressure drop according to claim 1, which is characterized in that in the step S200, record
The initial open circuit voltage OCV of the battery0At a temperature of the battery is placed in second environment before, shelved for the second time.
3. the calculation method of battery pressure drop according to claim 1, which is characterized in that in the step S400, record
The battery is placed under third environment temperature before the open-circuit voltage, shelves the third time.
4. the calculation method of battery pressure drop according to claim 1, which is characterized in that by battery in the step S100
State-of-charge is adjusted to 100% state.
5. the calculation method of battery pressure drop according to claim 1, which is characterized in that first described in the step S300
Time is 1-3 days.
6. the calculation method of battery pressure drop according to claim 1, which is characterized in that the first environment temperature is 30
℃-70℃。
7. the calculation method of battery pressure drop according to claim 2, which is characterized in that second time is 3-6 hours.
8. the calculation method of battery pressure drop according to claim 2, which is characterized in that the second environment temperature is 20
℃-30℃。
9. the calculation method of battery pressure drop according to claim 3, which is characterized in that the third environment temperature is 20
℃-30℃。
10. the calculation method of battery pressure drop according to claim 1, which is characterized in that include in the step S600 with
Lower step:
Step S510, the difference for calculating two open-circuit voltages of the two neighboring first time record, obtains the battery
Pressure drop Δ V；
Step S520, pressure drop Δ V and time are drawn according to the pressure drop Δ V and time interval t when recording the open-circuit voltage
It is spaced 1/t logarithmic relationship figure；
Step S520, it is fitted according to the logarithmic relationship figure and obtains fit equation；
Step S530, matched curve is drawn according to the fit equation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296005A (en) * | 2021-04-25 | 2021-08-24 | 浙江超威创元实业有限公司 | Method for testing voltage drop of battery |
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