CN108802617B - Battery core semi-finished product testing method - Google Patents
Battery core semi-finished product testing method Download PDFInfo
- Publication number
- CN108802617B CN108802617B CN201710312182.XA CN201710312182A CN108802617B CN 108802617 B CN108802617 B CN 108802617B CN 201710312182 A CN201710312182 A CN 201710312182A CN 108802617 B CN108802617 B CN 108802617B
- Authority
- CN
- China
- Prior art keywords
- finished product
- semi
- charging
- battery core
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a method for testing a semi-finished product of a battery core. And when the voltage difference between the first conducting part and the second conducting part of the semi-finished product of the battery cell is smaller than the voltage threshold value, the semi-finished product of the battery cell is charged with constant current. When the voltage difference between the first connecting part and the second connecting part is larger than or equal to the voltage threshold value, the semi-finished product of the battery core is charged with constant voltage. And after the preset time interval for starting charging, acquiring the total electric quantity for charging the semi-finished product of the battery core at constant current in the preset time interval. And judging whether the total electric quantity is larger than the electric quantity threshold value. And when the total electric quantity is greater than the electric quantity threshold value, judging that the insulation degree of the semi-finished product of the battery core is poor.
Description
Technical Field
The invention relates to a method for testing a semi-finished product of a battery cell, in particular to a method for testing the insulation degree of the semi-finished product of the battery cell.
Background
In recent years, the electronic industry has been vigorously developed, and various electronic devices have been widely used. The most important aspects for the manufacture of portable electronic devices are the miniaturization of volume and the reduction of weight. In order to provide convenience for carrying electrical appliances and further reduce the limitation of the external environment on providing electric energy, batteries have become very popular electric energy storage devices to provide electric energy at any time.
Most portable electronic devices today mainly use reusable lithium ion secondary batteries with large capacity, volume and mass energy density. The lithium battery is mainly formed by stacking a plurality of positive plates, negative plates and isolating films to form a battery core semi-finished product, and then injecting electrolyte into the battery core to form a finished product of the lithium battery. In such a structure, the distance between the positive and negative electrodes of the battery cell is important. At present, the distance between the positive electrode and the negative electrode of the battery core is mainly propped by a separation film. However, in the manufacturing process, a short circuit may be caused by a local distance between the two electrodes being insufficient due to trimming of the material, a foreign material flying in during the winding process, or a non-uniform thickness of the material.
In the manufacturing process, although the battery cell is tested for the degree of insulation, the insulation effect is mainly confirmed by a long-time continuous withstand voltage Test (Hi-pot Test) at present. Such a test method requires a long energy conversion time, and the capacitance error of the object to be tested is not small (+/-20%) and is prone to cause erroneous judgment. In addition, the magnitude of the difference between the steady-state voltage of the battery cell semi-finished product and the discharge voltage in the charging process is not large, and there is a possibility that the difference cannot be determined.
Disclosure of Invention
The invention provides a method for testing a semi-finished product of a battery cell, which aims to solve the problems that the traditional method for testing the semi-finished product of the battery cell has long testing time and is easy to misjudge or can not judge flaws.
The invention discloses a testing method of a semi-finished product of a battery cell, which is suitable for the semi-finished product of the battery cell. The semi-finished product of the battery core comprises a first electrode and a second electrode. A first electrode and a second electrode are alternately stacked. An insulating layer is disposed between a first electrode and a second electrode. A first electrode is connected with the first conducting connection part, and a second electrode is connected with the second conducting connection part. In the method for testing the semi-finished product of the battery core, when the voltage difference between the first connecting part and the second connecting part is smaller than a voltage threshold value, the semi-finished product of the battery core is charged with constant current. When the voltage difference between the first connecting part and the second connecting part is larger than or equal to the voltage threshold value, the semi-finished product of the battery core is charged with constant voltage. And after the preset time interval for starting charging, acquiring the total electric quantity for charging the semi-finished product of the battery core at constant current in the preset time interval. And judging whether the total electric quantity is larger than the electric quantity threshold value. And when the total electric quantity is greater than the electric quantity threshold value, judging that the insulation degree of the semi-finished product of the battery core is poor.
In summary, the present invention provides a method for testing a battery cell semi-finished product, which determines whether the total charging amount of the battery cell semi-finished product charged by a constant current is greater than an electric quantity threshold value, so as to determine whether the insulation degree of the battery cell semi-finished product meets the requirement. Therefore, a quantitative analysis means is provided besides the test time is saved.
Drawings
Fig. 1A is a schematic structural diagram of an ideal battery cell semi-finished product according to an embodiment of the invention.
Fig. 1B is a schematic structural diagram of a defective battery cell semi-finished product according to an embodiment of the invention.
Fig. 2A is a schematic diagram illustrating a voltage difference when an ideal battery cell semi-finished product is charged according to an embodiment of the invention.
Fig. 2B is a schematic diagram illustrating a voltage difference when a non-ideal semi-finished battery cell is charged according to an embodiment of the invention.
Fig. 2C is a schematic diagram illustrating a voltage difference when a non-ideal semi-finished battery cell is charged according to another embodiment of the invention.
Fig. 3 is a flowchart illustrating a method for testing a semi-finished battery cell according to an embodiment of the invention.
Fig. 4A is a diagram illustrating the total amount of power consumed to charge the ideal battery cell semi-finished product with a constant current according to the corresponding embodiment of fig. 2A.
Fig. 4B is a diagram illustrating the total amount of power consumed to charge the non-ideal half-finished battery cell with a constant current according to the corresponding embodiment of fig. 2B.
Fig. 4C is a diagram illustrating the total amount of power consumed to charge the non-ideal half-finished battery cell with a constant current according to the corresponding embodiment of fig. 2C.
Fig. 5 is a method flowchart illustrating a portion of steps of a method for testing a semi-finished battery cell according to another embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating a voltage difference when a battery cell semi-finished product is charged according to another embodiment of the invention.
Fig. 7 is a method flowchart illustrating a portion of steps of a method for testing a semi-finished battery cell according to yet another embodiment of the present invention.
Wherein, the reference numbers:
10 cell core semi-finished product
C1 first lead-in part
C2 second lead connection part
CC. Current charging interval of CCI, CC1, CC2 and CC2
CV, CVI, CV1, CV2, CV 2' voltage charging interval
E1a, E1b, E1c, E1d and E1E first electrodes
E2a, E2b, E2c and E2d second electrodes
ti, t1, t2, t3, t4 time points
Tdef1, Tdef2, Tdef3, Tdef3 'and Tdef 3' preset time interval
Tref reference time interval
Actual test interval of Ttest
Vth voltage threshold
Detailed Description
The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical contents of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art from the disclosure, the claims and the drawings of the present specification. The following examples further illustrate aspects of the present invention in detail, but are not intended to limit the scope of the invention in any way.
The invention provides a testing method of a semi-finished product of a battery cell, which is suitable for the semi-finished product of the battery cell. Referring to fig. 1A to briefly describe a battery cell semi-finished product, fig. 1A is a schematic structural diagram of a battery cell semi-finished product according to an embodiment of the invention. A cell blank 10 has a first electrode and a second electrode. In the embodiment shown in fig. 1, the first electrodes E1a, E1b, E1c, E1d, E1E and the second electrodes E2a, E2b, E2c, E2d are taken as examples for illustration, but the number of the first electrodes and the second electrodes is not limited thereto. In practice, an insulating layer is disposed between the first electrode and the second electrode to isolate the first electrode from the second electrode, but for simplicity and understanding of the drawings, further description of the insulating layer is omitted here.
The first electrodes E1a, E1b, E1C, E1d, and E1E of the cell semi-finished product 10 are connected to the first lead portion C1, and the second electrodes E2a, E2b, E2C, and E2d are connected to the second lead portion C2. In practice, the first conductive connection portion C1 and the second conductive connection portion C2 are made of conductive material, and the first conductive connection portion C1 and the second conductive connection portion C2 are connected to each first electrode or each second electrode by clamping, welding or other methods. In other words, the first electrodes E1a, E1b, E1C, E1d, E1E are electrically connected to each other by the first conductive connection portion C1, and the second electrodes E2a, E2b, E2C, E2d are electrically connected to each other by the second conductive connection portion C2. The first electrodes E1a, E1b, E1c, E1d, E1E are, for example, one of an anode or a cathode of a battery, and the second electrodes E2a, E2b, E2c, E2d are, for example, the other of the anode or the cathode of the battery.
Ideally, the structure of the cell semi-finished product should be as shown in fig. 1A, that is, the first electrodes and the second electrodes of the cell semi-finished product do not contact each other, or there is no short circuit between any of the first electrodes E1A, E1b, E1c, E1d, E1E and any of the second electrodes E2a, E2b, E2c, E2 d. However, in practice, part of the first electrode and part of the second electrode of the battery cell semi-finished product may be short-circuited due to burrs of the material, uneven thickness of the insulating layer, or a foreign matter during the manufacturing process. Fig. 1B is a schematic diagram illustrating a non-ideal semi-finished product of a battery cell, and fig. 1B is a schematic diagram illustrating a defective semi-finished product of a battery cell according to an embodiment of the invention. The structure of the cell semi-finished product 10' is substantially similar to the structure of the cell semi-finished product 10. Unlike fig. 1A, foreign matter P is present in the structure of the battery cell semi-finished product 10'. The foreign matter P is located between the first electrode E1b and the second electrode E2b of the cell semi-finished product 10'. The foreign substance P contacts the first electrode E1b and the second electrode E2b, and short-circuits the first electrode E1b and the second electrode E2 b.
In practice, the foreign matter P is likely to move randomly depending on the current physical conditions. Therefore, the starting time and the duration of the short circuit between the first electrode E1b and the second electrode E2b, and the degree of electrical continuity between the electrodes vary depending on the material and size of the foreign substance P or the contact with the electrodes. That is, even if foreign matter exists in the structure of the battery cell semi-finished product, the foreign matter does not always cause a short circuit condition, and the relative time for each occurrence of a short circuit is not necessarily the same. Therefore, there is a need for a testing method of a battery cell semi-finished product to identify the insulation degree of the battery cell semi-finished product, and even quantify the insulation degree of the battery cell semi-finished product. The description will be made with the cell semi-finished product 10 representing an ideal cell semi-finished product and the cell semi-finished product 10' representing a non-ideal cell semi-finished product.
Fig. 2A is a schematic diagram illustrating a voltage difference when charging an ideal battery cell semi-finished product 10 according to an embodiment of the invention. More specifically, fig. 2A is a schematic diagram illustrating a voltage difference between the first conductive connection portion C1 and the second conductive connection portion C2, or a voltage difference between any first electrode and any second electrode when the battery cell semi-finished product 10 is charged. In fig. 2A, the horizontal axis represents time, and the vertical axis represents the voltage value of the voltage difference. Fig. 2A defines a constant current charging interval CCI and a constant voltage charging interval CVI. In the constant current charging interval CCI, the battery cell semi-finished product 10 is charged with a constant current as defined by the literal. In the constant voltage charging interval CVI, the battery cell semi-finished product 10 is charged at a constant voltage.
In the embodiment shown in fig. 2A, the battery cell semi-finished product 10 is charged with a constant current. When the voltage difference is greater than or equal to the voltage threshold Vth, the battery cell semi-finished product 10 is charged with a constant voltage instead. In this embodiment, the voltage difference of the battery cell semi-finished product 10 is charged to the voltage threshold value at the time point ti. Therefore, the time point ti is preceded by the constant current charging interval CCI, and the time point ti is followed by the constant voltage charging interval CVI. Corresponding to different charging modes, the part of the voltage difference of the battery cell semi-finished product 10 in the constant current charging interval CCI is an inclined straight line with a fixed slope, and the part of the voltage difference of the battery cell semi-finished product 10 in the constant voltage charging interval CVI is a horizontal straight line with a slope of 0.
Please refer to fig. 2B again to illustrate the situation when the non-ideal semi-finished battery cell is charged. Fig. 2B is a schematic diagram illustrating a voltage difference when the battery cell semi-finished product 10' is charged according to an embodiment of the invention. In fig. 2B, ideal and non-ideal cases are plotted, wherein the voltage difference of the cell semi-finished product 10' is represented by a thick line and the voltage difference of the cell semi-finished product 10 is represented by a thin line for comparison. The voltage difference of the battery cell semi-finished product 10 in fig. 2B is the voltage difference of the battery cell semi-finished product 10 in fig. 2A. Corresponding to the voltage difference of the battery cell semi-finished product 10', a constant current charging interval CC1 and a constant voltage charging interval CV1 are further defined in fig. 2B. The constant current charging interval CC1 is before the time point t2, and the constant voltage charging interval CV1 is after the time point t 2.
In the embodiment shown in fig. 2B, the battery cell semi-finished product 10' is charged with a constant current. In the embodiment shown in fig. 2B, a short-circuit condition temporarily occurs at a time point t 1. Time t1 precedes time ti. Therefore, before the time point t1, the voltage difference of the battery cell semi-finished product 10' rises at a constant voltage increase rate (constant slope in the figure). However, when the structure of the cell semi-finished product 10 'is short-circuited at the time point t1 as shown in fig. 1B, a part of the electrodes of the cell semi-finished product 10' is abnormally discharged while the cell semi-finished product 10 'is charged with a constant current, so that the voltage difference of the cell semi-finished product 10' rapidly decreases near the time point t 1. After time t1, the short-circuit situation is eliminated due to the actual physical conditions, and the voltage difference of the battery cell semi-finished product 10' charged with the constant current increases again at the constant voltage increase rate. Until the time point t2, the voltage difference of the battery cell semi-finished product 10 'is charged to the voltage threshold Vth, and at this time, the battery cell semi-finished product 10' is charged with the constant voltage.
Fig. 2C is a schematic diagram of a voltage difference when charging a non-ideal cell semi-finished product according to another embodiment of the invention. Fig. 2C also illustrates the ideal and non-ideal cases, wherein the voltage difference of the cell semi-finished product 10' is represented by a thick line and the voltage difference of the cell semi-finished product 10 is represented by a thin line. In fig. 2C, constant current charging intervals CC2 and CC2 'and constant voltage charging intervals CV2 and CV 2' are defined corresponding to the voltage difference of the battery cell semi-finished product 10 ', the constant current charging interval CC2 precedes the constant voltage charging interval CV2, the constant voltage charging interval CV2 precedes the constant current charging interval CC 2', and the constant current charging interval CC2 'precedes the constant voltage charging interval CV 2'. The constant-current charging section CC2 is located before the time point ti on the time axis, the constant-voltage charging section CV2 is located between the time point ti and the time point t3 on the time axis, the constant-current charging section CC2 'is located between the time point t3 and the time point t4 on the time axis, and the constant-voltage charging section CV 2' is located after the time point t4 on the time axis.
In the exemplary embodiment shown in fig. 2C, the voltage difference of the battery cell blank 10' is charged to the voltage threshold Vth at the time ti. The short circuit condition occurs at a time point t3, time point t3 being after time point ti on the time axis. The voltage difference of the battery cell semi-finished product 10' rapidly decreases at the time point t 3. Since the voltage difference of the cell semi-finished product 10 'is smaller than the voltage threshold Vth after the time point t3, the cell semi-finished product 10' is charged again with a constant current. After time t3, the short-circuit situation is temporarily eliminated because of the actual physical conditions, so that the voltage difference of the battery cell semifinished product 10' charged with constant current rises again at a constant voltage increase rate. Until time t4, the voltage difference of the battery cell blank 10' is again charged to the voltage threshold Vth. At this time, the battery cell semi-finished product 10' is charged again at a constant voltage.
In view of the above, the present invention provides a method for testing a semi-finished product of a battery cell to detect a non-ideal semi-finished product of the battery cell, please refer to fig. 2 to describe the method for testing the semi-finished product of the battery cell provided by the present invention, and fig. 3 is a flowchart illustrating the method for testing the semi-finished product of the battery cell according to an embodiment of the present invention. As shown in fig. 3, in step S101, when the voltage difference between the first connecting portion and the second connecting portion is smaller than the voltage threshold, the battery cell semi-finished product is charged with a constant current. In step S103, when the voltage difference between the first connecting portion and the second connecting portion is greater than or equal to the voltage threshold, the battery cell semi-finished product is charged with a constant voltage. In step S105, after the preset time interval for starting charging, the total amount of electricity charged to the semi-finished product of the battery cell at the constant current in the preset time interval is obtained. In step S107, it is determined whether the total power is greater than the power threshold. In step S109, when the total power is greater than the power threshold, it is determined that the insulation degree of the battery cell semi-finished product is poor. The testing method of the semi-finished product of the battery cell can test the short circuit condition of the semi-finished product of the battery cell at different time and provide a quantitative index. The following description will be made for different cases.
Referring to fig. 4A, fig. 4A is a schematic diagram illustrating a charging current for charging an ideal battery cell semi-finished product with a constant current according to the embodiment shown in fig. 2A. In fig. 4A, the horizontal axis represents time, the vertical axis represents current, and fig. 4A indicates a predetermined time period Tdef 1. Referring to step S105 of the method for testing the semi-finished product of battery cells, in the embodiment shown in fig. 4A, after the preset time period Tdef1 for starting the charging, the total amount of electricity charged to the semi-finished product of battery cells with a constant current in the preset time period Tdef1 is obtained. In practice, the area under the current curve is the total amount of electricity consumed when the semi-finished battery cell 10 is charged with a constant current. In other words, when the preset time period Tdef1 is not less than the constant current charging period CCI, the total amount of electricity charged to the battery cell semi-finished product can be obtained according to the current IC and the time parameter. In practice, the actual total electric quantity can be obtained by integrating the current and the time. Alternatively, when the charging current value is known, the total time for charging the battery cell semi-finished product 10 with a constant current may be counted, and the total electric quantity may be obtained according to the charging current value and the total time.
Referring to fig. 4B, fig. 4B is a schematic diagram illustrating a charging current for charging the non-ideal battery cell semi-finished product with a constant current according to the embodiment corresponding to fig. 2B. Similarly to fig. 2B, fig. 4B shows an ideal situation with a thin line and a non-ideal situation with a thick line. On the other hand, fig. 4B indicates a predetermined time period Tdef 2. As described above, since the battery cell semi-finished product 10' is not normally discharged at the time point T1, the time point T1 is located before the time point ti on the time axis, so that the constant current charging interval CC1 is longer than the constant current charging interval CCI. Therefore, the area under the thick line is larger than that under the thin line, i.e., the total power consumed by charging at a constant current under the non-ideal condition is larger than that consumed by charging at a constant current under the ideal condition. Therefore, referring to steps S107 and S109 of the method for testing the semi-finished battery cell, when the total amount of power consumed during the next charging with the constant current is obtained, the total amount of power is compared with a power threshold. When the total electric quantity is larger than the electric quantity threshold value, the total electric quantity is larger than the electric quantity consumed by charging the ideal semi-finished product of the battery cell with constant current, and at the moment, the insulation degree of the semi-finished product of the battery cell is judged to be poor.
In one embodiment, the predetermined time period Tdef2 covers a portion of the time period for charging the battery cell semi-finished product with a constant voltage. That is, in the embodiment shown in fig. 4B, the total amount of power consumed by the constant current charging is counted after a period of time from the constant current charging to the constant voltage charging. In another embodiment, the related test circuit is triggered to count the total amount of power consumed by constant current charging while the constant current charging is switched to constant voltage charging.
Referring to fig. 4C, fig. 4C is a schematic diagram illustrating the total amount of power consumed by charging the non-ideal semi-finished battery cell with a constant current according to the embodiment corresponding to fig. 2C. As shown in fig. 4C, the regions under the current curve for charging the battery cell semi-finished product 10' with a constant current may be defined as a region a1 and a region a2, respectively. The sum of the area of the region a1 and the area of the region a2 is the total amount of electricity consumed to charge the battery cell semi-finished product 10' at a constant current. In an embodiment, in the method for testing the semi-finished product of the battery cell provided by the present invention, for example, after the time point T4, all the total amount of power consumed by charging with a constant current before the time point T4 is counted, which is equivalent to the sum of the area of the region a1 and the area of the region a2, and the sum is determined accordingly. From another point of view, it is equivalent to count all the total power consumed by charging with constant current in the preset time interval Tdef 3. In another embodiment, for example, the counting and determination may be performed each time the constant current charging is switched to the constant voltage charging. Referring to fig. 4C, for example, the area of the region a1 and the area of the region a2 can be obtained, and the sum of the area of the region a1 and the area of the region a2 is calculated to determine whether the sum is greater than the charge threshold. Alternatively, the area of the region a1 and the area of the region a2 are obtained, and the area of the region a1 and the area of the region a2 are compared with the corresponding threshold values. The threshold value corresponding to the area of the region a1 is, for example, the aforementioned power threshold value, and the threshold value corresponding to the area of the region a2 is, for example, 0 or a very small value. From another point of view, it is equivalent to count the amount of power consumed by charging with constant current in the preset time interval Tdef 3' and the amount of power consumed by charging with constant current in the preset time interval Tdef3 ", and then obtain the total amount of power for determination.
In an embodiment corresponding to the embodiment shown in fig. 4C, the method for testing a battery cell semi-finished product provided by the present invention further includes the following steps, referring to fig. 5, and fig. 5 is a flowchart illustrating a method of testing a battery cell semi-finished product according to another embodiment of the present invention. In step S201, a plurality of current charging times charged with a constant current in a predetermined time interval are counted. In step S203, a plurality of current charging capacities are obtained according to the constant current and the current charging time. In step S205, it is determined whether each of the current charging capacities is greater than the corresponding capacity threshold, and when one of the current charging capacities is greater than the corresponding capacity threshold, it is determined that the insulation degree of the battery cell semi-finished product is poor.
As mentioned above, in the method for testing the semi-finished product of the battery cell provided by the present invention, it is determined whether the total power is greater than the power threshold QREF, so as to determine the insulation degree of the semi-finished product of the battery cell. In one embodiment, the threshold QREF is, for example, a theoretical ideal total charge plus a tolerance, the ideal total charge can be obtained from theory, manufacturing process parameters or experience, or is, for example, the total charge required to charge the semi-finished battery cell 10 to the threshold voltage VTH at a constant current. The size of the tolerance value is self-defined by the actual requirement of the skilled person and is not limited herein.
In another embodiment, the threshold QREF is obtained by charging the battery cell semi-finished product for multiple times, and adding a tolerance to the total experimental charge amount charged by a constant current. As shown in fig. 6, fig. 6 is a schematic diagram of a voltage difference when a battery cell semi-finished product is charged according to another embodiment of the present invention. Fig. 6 shows the reference time interval Tref and the actual test interval Ttest, and details of the actual test interval Ttest are as described above, which are not repeated herein. The charging step similar to the actual test interval Ttest is performed in the reference time interval Tref. More specifically, a constant current charging interval CCref and a constant voltage charging interval CVref are defined in the reference time interval Tref, and the to-be-tested battery cell semi-finished product is charged with a constant current in the constant current charging interval CCref until the voltage difference of the to-be-tested battery cell semi-finished product is not less than the voltage threshold VTH in the reference time interval Tref. And in the constant voltage charging interval CCref, charging the semi-finished product of the battery cell to be tested by constant voltage. The total power consumed by the constant power flow charging in the reference time interval Tref is used as a reference total power. The reference total power plus the tolerance value is the power threshold QREF
Corresponding to the embodiment shown in fig. 6, in an embodiment, the method for testing a battery cell semi-finished product further includes the following steps to generate the power threshold QREF. Referring to fig. 7, fig. 7 is a flowchart illustrating a method of testing a battery cell semi-finished product according to another embodiment of the invention. In step S301, in a reference time interval, when a voltage difference between the first connecting portion and the second connecting portion is smaller than a voltage threshold, the battery cell semi-finished product is charged with a constant current, and the reference time interval is prior to a preset time interval. In step S303, in the reference time interval, when the voltage difference between the first connecting portion and the second connecting portion is greater than or equal to the voltage threshold, the battery cell semi-finished product is charged with a constant voltage. In step S305, a reference total power for charging the battery cell semi-finished product with a constant current in a reference time interval is obtained, and the power threshold is the reference total power plus the tolerance.
In summary, the present invention provides a method for testing a battery cell semi-finished product, which determines whether the total charging amount of the battery cell semi-finished product charged by a constant current is greater than an electric quantity threshold value, so as to determine whether the insulation degree of the battery cell semi-finished product meets the requirement. Therefore, the test time is saved, and the test conditions under different tests can be compared by continuously and repeatedly testing a single product. In addition, compared with the conventional qualitative analysis method which can only detect whether the short circuit condition exists, the method provides a quantitative analysis means for judging by the total charge amount, and has great practicability.
The detailed features and advantages of the present invention are described in detail in the embodiments below, which are sufficient for anyone skilled in the art to understand the technical contents of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art from the disclosure of the present specification, the protection scope of the claims and the accompanying drawings. The following examples further illustrate aspects of the present invention in detail, but are not intended to limit the scope of the invention in any way.
Claims (7)
1. A battery core semi-finished product testing method is characterized in that the battery core semi-finished product testing method is suitable for a battery core semi-finished product, the battery core semi-finished product comprises a first electrode and a second electrode, the first electrode and the second electrode are arranged in a staggered and laminated mode, an insulating layer is arranged between the first electrode and the second electrode, the first electrode is connected with a first conducting portion, the second electrode is connected with a second conducting portion, and the testing method comprises the following steps:
when the voltage difference between the first connecting part and the second connecting part is smaller than a voltage threshold value, charging the semi-finished product of the battery core at a certain current;
when the voltage difference between the first connecting part and the second connecting part is greater than or equal to the voltage threshold value, charging the semi-finished product of the battery core at a certain voltage;
after a preset time interval for starting charging, acquiring total electric quantity for charging the semi-finished product of the battery core at the constant current in the preset time interval; and
judging whether the total electric quantity is larger than an electric quantity threshold value, judging that the insulation degree of the semi-finished product of the battery core is poor when the total electric quantity is larger than the electric quantity threshold value,
the method for testing the semi-finished product of the battery core further comprises the following steps:
in a reference time interval, when the voltage difference between the first connecting part and the second connecting part is smaller than the voltage threshold value, the semi-finished product of the battery core is charged with a certain current, and the reference time interval is prior to the preset time interval;
in the reference time interval, when the voltage difference between the first connecting part and the second connecting part is greater than or equal to the voltage threshold value, charging the semi-finished product of the battery core at a certain voltage; and
and acquiring a reference total electric quantity for charging the semi-finished product of the battery core by the constant current in the reference time interval, wherein the electric quantity threshold value is the reference total electric quantity plus a tolerance value.
2. The method of claim 1, wherein the predetermined time interval covers a portion of a time interval during which the semi-finished battery cell is charged at the constant voltage.
3. The method as claimed in claim 2, wherein a total time of charging with the constant current in the predetermined time interval is counted, and the total amount of electricity is obtained according to the constant current and the total time.
4. The method as claimed in claim 1, wherein the total amount of electricity charged in the battery cell semi-finished product at the constant current is counted after the battery cell semi-finished product is charged at the constant voltage.
5. The method as claimed in claim 4, wherein a total time of charging at the constant current before charging the semi-finished product of the battery cell at the constant voltage is counted, and the total amount of electricity is obtained by integrating the constant current and the total time.
6. The method of claim 1, wherein the threshold value is a sum of an ideal total charge amount corresponding to the semi-finished product plus a tolerance value.
7. A battery core semi-finished product testing method is characterized in that the battery core semi-finished product testing method is suitable for a battery core semi-finished product, the battery core semi-finished product comprises a first electrode and a second electrode, the first electrode and the second electrode are arranged in a staggered and laminated mode, an insulating layer is arranged between the first electrode and the second electrode, the first electrode is connected with a first conducting portion, the second electrode is connected with a second conducting portion, and the testing method comprises the following steps:
when the voltage difference between the first connecting part and the second connecting part is smaller than a voltage threshold value, charging the semi-finished product of the battery core at a certain current;
when the voltage difference between the first connecting part and the second connecting part is greater than or equal to the voltage threshold value, charging the semi-finished product of the battery core at a certain voltage;
after a preset time interval for starting charging, acquiring total electric quantity for charging the semi-finished product of the battery core at the constant current in the preset time interval; and
judging whether the total electric quantity is larger than an electric quantity threshold value, judging that the insulation degree of the semi-finished product of the battery core is poor when the total electric quantity is larger than the electric quantity threshold value,
wherein the preset time interval covers part of the time interval for charging the semi-finished product of the battery cell with the constant voltage,
the method for testing the semi-finished product of the battery core further comprises the following steps:
counting a plurality of current charging times charged by the constant current in the preset time interval;
obtaining a plurality of current charging electric quantities according to the constant current and the current charging time; and
and judging whether each current charging electric quantity is larger than the corresponding electric quantity threshold value, and judging that the insulation degree of the semi-finished product of the battery core is poor when one of the current charging electric quantities is larger than the corresponding electric quantity threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710312182.XA CN108802617B (en) | 2017-05-05 | 2017-05-05 | Battery core semi-finished product testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710312182.XA CN108802617B (en) | 2017-05-05 | 2017-05-05 | Battery core semi-finished product testing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108802617A CN108802617A (en) | 2018-11-13 |
| CN108802617B true CN108802617B (en) | 2020-12-01 |
Family
ID=64053710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710312182.XA Active CN108802617B (en) | 2017-05-05 | 2017-05-05 | Battery core semi-finished product testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108802617B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391305A (en) * | 2001-05-29 | 2003-01-15 | 佳能株式会社 | Method, apparatus and application for detecting data of chargable cell |
| CN1679199A (en) * | 2002-08-29 | 2005-10-05 | 松下电器产业株式会社 | Method for inspecting secondary battery precursor, and method for manufacturing secondary battery using the method |
| CN101431166A (en) * | 2007-11-09 | 2009-05-13 | 深圳市比克电池有限公司 | Screening method for recessive short circuit lithium ion cell |
| CN102809696A (en) * | 2012-08-17 | 2012-12-05 | 福建南平南孚电池有限公司 | Metal fixture, equipment with metal fixture and use method thereof |
| CN202929110U (en) * | 2012-08-17 | 2013-05-08 | 福建南平南孚电池有限公司 | Metal clamp and equipment for measuring insulation resistance of dielectric |
| CN103149532A (en) * | 2011-12-06 | 2013-06-12 | 哈尔滨智木科技有限公司 | New method of representation battery |
| CN103176135A (en) * | 2011-12-26 | 2013-06-26 | 财团法人工业技术研究院 | Battery aging evaluation method |
| CN205621795U (en) * | 2016-05-24 | 2016-10-05 | 程建聪 | Chemical battery of safe type |
-
2017
- 2017-05-05 CN CN201710312182.XA patent/CN108802617B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391305A (en) * | 2001-05-29 | 2003-01-15 | 佳能株式会社 | Method, apparatus and application for detecting data of chargable cell |
| CN1679199A (en) * | 2002-08-29 | 2005-10-05 | 松下电器产业株式会社 | Method for inspecting secondary battery precursor, and method for manufacturing secondary battery using the method |
| CN101431166A (en) * | 2007-11-09 | 2009-05-13 | 深圳市比克电池有限公司 | Screening method for recessive short circuit lithium ion cell |
| CN103149532A (en) * | 2011-12-06 | 2013-06-12 | 哈尔滨智木科技有限公司 | New method of representation battery |
| CN103176135A (en) * | 2011-12-26 | 2013-06-26 | 财团法人工业技术研究院 | Battery aging evaluation method |
| CN102809696A (en) * | 2012-08-17 | 2012-12-05 | 福建南平南孚电池有限公司 | Metal fixture, equipment with metal fixture and use method thereof |
| CN202929110U (en) * | 2012-08-17 | 2013-05-08 | 福建南平南孚电池有限公司 | Metal clamp and equipment for measuring insulation resistance of dielectric |
| CN205621795U (en) * | 2016-05-24 | 2016-10-05 | 程建聪 | Chemical battery of safe type |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108802617A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5172579B2 (en) | Cylindrical battery inspection method | |
| CN102590623B (en) | Secondary battery tester, secondary battery testing method, and manufacturing method of secondary battery | |
| CN110168390B (en) | Apparatus and method for inspecting secondary battery defects | |
| US7239147B2 (en) | Method and device for inspecting secondary battery precursor and method for manufacturing secondary battery using the inspection method | |
| CN111458642A (en) | Nondestructive testing method for lithium separation of lithium ion storage battery | |
| CN210350034U (en) | Battery device with measurable internal temperature | |
| CN113533981B (en) | Lithium ion battery self-discharge detection method, equipment and computer readable storage medium | |
| JP4887581B2 (en) | Battery inspection method and inspection apparatus | |
| CN114069077A (en) | Electrochemical device management method, electronic apparatus, and battery system | |
| JP4233073B2 (en) | Non-aqueous electrolyte battery defect sorting method | |
| EP3669198A1 (en) | Maturation processes for electric batteries | |
| US20130295424A1 (en) | Electrolyte-Based Battery Cell, Method and System for Determining the State of Charge of Electrolyte-Based Batteries | |
| CN108134417B (en) | Method for balancing energy of each single battery cell in battery | |
| JP5985280B2 (en) | Inspection method for lithium ion secondary battery | |
| TWI621866B (en) | Test method for semi-finished product of battery core | |
| CN108802617B (en) | Battery core semi-finished product testing method | |
| KR101769182B1 (en) | Method for detecting a secondary battery whose electrolyte is defectively impregnated | |
| JP2004111371A (en) | Method for inspecting secondary battery precursor, its inspection device, and method for manufacturing secondary battery using the method | |
| JP2018067498A (en) | Method of manufacturing battery | |
| JP2015185485A (en) | Method for self-discharge inspection of nonaqueous electrolyte secondary batteries | |
| KR20220138739A (en) | Method for detecting abnormal battery through relative comparison | |
| CN113795965A (en) | Electrochemical device management method, electronic apparatus, charging device, and storage medium | |
| JP2017126539A (en) | Method for manufacturing secondary battery | |
| JP7011782B2 (en) | Secondary battery inspection method | |
| JP2014082063A (en) | Method for manufacturing secondary battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |