CN117665601A - Battery internal short circuit nondestructive testing method based on magnetic field gradient distribution - Google Patents
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- 238000009826 distribution Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 48
- 238000010277 constant-current charging Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 238000012360 testing method Methods 0.000 claims description 36
- 238000001514 detection method Methods 0.000 claims description 20
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 32
- 229910001416 lithium ion Inorganic materials 0.000 description 32
- 230000002159 abnormal effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000001960 triggered effect Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 239000012188 paraffin wax Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- -1 nickel cobalt aluminum manganate Chemical compound 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
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Abstract
A non-destructive testing method for short circuit in a battery based on magnetic field gradient distribution relates to the technical field of batteries, and comprises the following steps: in the constant current charging state, the constant current discharging state or the resting process of the battery, detecting the external magnetic field distribution of the battery to be detected at any time interval by adopting a magnetic sensor; acquiring the relative change distribution of an external magnetic field under the corresponding working condition states of the batteries at different time points; calculating the gradient distribution of the magnetic field component of the relative variation distribution of the external magnetic field in the y and x directionsAndif the gradient distribution of the magnetic field components is in the same regionThe field has gradient abrupt change and gradient direction reversal along the axial direction, so that the internal short circuit of the battery in the area can be judged.
Description
Technical Field
The invention belongs to the technical field of battery detection, and particularly relates to a non-destructive detection method for short circuit in a battery based on magnetic field gradient distribution.
Background
With the increasing problems of energy shortage and environmental pollution, the automotive industry is actively looking for new energy solutions that are safer, more efficient, lower in carbon and environmentally friendly. Among many new energy sources, lithium ion batteries are widely used in the field of new energy automobiles because of their advantages of high energy density, long life, no memory effect and environmental protection. However, the problem of lithium ion battery safety has become a major bottleneck that hinders the large-scale industrial application thereof, especially the problem of internal short circuit. Internal short circuits in lithium ion batteries can seriously affect battery performance and even cause thermal runaway phenomena, and have been considered as an important safety problem of lithium ion batteries.
The existing detection method of the lithium ion battery is mainly based on the electrical characteristics after internal short circuit, such as the abnormal drop of the battery terminal voltage or state of charge (SOC), the difference between the internal short circuit battery and the battery pack voltage or current, and the like. The method is to verify the accuracy of the method by obtaining abnormal electrical data through external short circuit equivalent internal short circuit, and the method is different from the actual internal short circuit, so that whether the internal short circuit fault exists or not can not be accurately identified in practical application, the internal short circuit position of a battery can not be positioned by the method, the opinion can not be provided for the design improvement of the subsequent battery, and the problems exist in the conventional commercial coiled battery and laminated battery.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a non-destructive detection method for the internal short circuit of a battery based on magnetic field gradient distribution.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for non-destructive detection of an internal short circuit of a battery based on magnetic field gradient distribution, the method comprising:
step 1, adopting a magnetic sensor to distribute an external magnetic field B of a battery to be tested in a constant current charging state, a constant current discharging state or a shelving process n (i, j) performing any time interval detection;
the method comprises the steps of setting a plane formed by the width direction and the length direction of a battery as an x-y plane, setting an axis in which the width direction is positioned as an x-axis, setting an axis in which the length direction is positioned as a y-axis, and setting an axis in which the thickness direction of the battery vertical to the plane is positioned as a z-axis; i, j represents the coordinates of any point in the x-y plane of the cell, where i represents the x-axis coordinates of the cell, j represents the y-axis coordinates, B x (i，j)、B y (i, j) and B z (i, j) three magnetic field components orthogonally decomposed by B (i, j), respectively;
step 2, according to the test results of different detection time points of the constant current charge state, the constant current discharge state or the rest state of the battery, obtaining the relative change distribution delta B (i, j) of the external magnetic field under the corresponding working condition state of the battery so as to eliminate the magnetic field interference generated outside the current density, wherein the specific method comprises the following steps:
ΔB(i，j)＝B n (i，j)-B n-1 (i, j) wherein B n (i, j) and B n-1 (i, j) the external magnetic field distribution of the battery to be tested obtained by the nth detection and the (n-1) th detection respectively;
step 3, calculating and solving gradient distribution of magnetic field components of the relative change distribution delta B (i, j) of the external magnetic field in y and x directions respectively under the corresponding working conditions of the battery at different time pointsAnd->
Wherein the gradient distribution of the magnetic field component of Δb (i, j) is divided into: ΔB (i, j) magnetic field component ΔB in x-direction x (i, j) gradient in y-directionAnd ΔB (i, j) a magnetic field component ΔB in the y-direction y (i, j) gradient in x-direction
Step 4, according to the relative change delta B (i, j) of the external magnetic field under the corresponding working condition of the battery at different time points, the magnetic field component delta B x (i, j) and ΔB y (i, j) gradient distribution in y and x directions, respectivelyAnd->If the gradient distribution of the magnetic field component of the battery to be tested is +.>And->The gradient abrupt changes occur in the same area, and the gradient direction is reversed along the axial direction, so that the internal short circuit of the battery in the area can be judged, and the severity of the internal short circuit can be judged according to the gradient edge size of the internal short circuit site and the gradient strength. That is, the larger the outline of the gradient edge of the short-circuit site is, the larger the short-circuit area is judged, the higher the intensity of the gradient of the short-circuit site is, the larger the short-circuit current is judged, and the more serious the short-circuit is.
The external magnetic field distribution test of the battery in the step 1 is performed on the surface of the battery or a plane close to the surface of the battery at a fixed height.
Further, when testing the external magnetic field of the tested battery, a single magnetic sensor is used for scanning test or a plurality of identical magnetic sensors are used for covering test to form an array.
Further, the magnetic sensor is a high-precision magnetic sensor such as a hall sensor, a fluxgate sensor, an anisotropic magneto-resistance sensor or a giant magneto-resistance sensor.
Furthermore, in the process of magnetic field detection in the step 1, magnetic shielding equipment is used for carrying out magnetic shielding protection on a battery to be detected, and various magnetic shielding devices which are made of various high-permeability metals and are used for shielding external magnetic field interference are adopted, so that the detection precision for early internal short circuits is further improved, and the complexity of the device is reduced under the environment of no magnetic shielding protection.
Further, the battery is a laminated battery or a wound battery. Preferably, the battery is a lithium ion battery or a sodium ion battery.
Further, the lithium ion battery is any type of commercial battery, the positive electrode of the lithium ion battery comprises nickel cobalt lithium manganate, nickel cobalt aluminum manganate, lithium cobaltate, lithium manganate or lithium iron phosphate, and the negative electrode comprises graphite or SiO x 。
It should be further noted that, the calculation of the relative change of the external magnetic field in the steps 2 and 3 must be the corresponding battery state, that is, the calculation of Δb (i, j) by testing the external magnetic field distribution of the battery under test at any two time points in the constant current charging state; or testing the external magnetic field distribution of the tested battery at any two time points under the constant current discharge state to calculate delta B (i, j); or, the external magnetic field distribution of the battery under test is tested at any two time points in the rest state to calculate Δb (i, j).
The nondestructive testing method for the internal short circuit of the battery is suitable for any internal short circuit triggering reason in practical situations, including various internal short circuit triggering reasons such as factory burrs, extrusion collision, high-temperature diaphragm melting, dendrite puncture and the like.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the detection of the internal short circuit of the battery by detecting the abnormal change of the distribution of the external magnetic field of the battery before and after the internal short circuit occurs and mapping the abnormal change of the distribution of the internal current density of the battery. Compared with the electrical characteristic detection method, the method can realize the space distribution detection of the internal short circuit fault sites, and provides powerful data support for follow-up fault tracing and fault tolerance control on the basis of judging whether the internal short circuit fault occurs.
2. The invention starts from an internal short circuit generation mechanism, and carries out internal short circuit fault detection aiming at the characteristics that the external magnetic field is locally abnormal, the positive and negative values are in pairs, and the external magnetic field is caused by the concentration of the current density of the positive and negative electrodes when the internal short circuit of the battery is caused.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a diagram of the placement of a battery under test;
fig. 3 is a graph showing the gradient of the relative change of the external magnetic field before and after the internal short circuit is triggered by the battery.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples, and it is apparent that the described examples are only some, but not all, of the examples of the invention, and all other examples obtained by those skilled in the art without making any inventive effort are within the scope of the present invention.
Example 1:
the invention provides a nondestructive testing method for internal short circuit of a lithium ion battery based on magnetic field gradient distribution, which is shown in figure 1 and comprises the following specific steps:
and 1, in the laying process, detecting the plane magnetic field distribution of the surface of the battery to be detected by adopting a magnetic sensor at any time interval.
In this embodiment, the measured battery is a commercial lithium ion soft package battery with a nominal capacity of 4Ah, and fig. 2 is a placement diagram of the measured battery; the magnetic field distribution testing equipment adopts a multi-axis mobile platform load three-axis fluxgate sensor to scan and test the tested battery; the external magnetic field shielding adopts a 5-layer magnetic shielding barrel for magnetic shielding protection.
In order to test the distribution change of the external magnetic field before and after the internal short circuit of the lithium ion battery, the local diaphragm is replaced by paraffin in the embodiment, and the internal short circuit is triggered by heating to simulate the state of the real internal short circuit battery.
According to the test method in step 1, firstly, external magnetic field test is performed on the lithium ion battery which is not triggered by internal short circuit in the rest state to obtain B 0 (i, h), then melting paraffin wax by heating to trigger internal short circuit of the battery, and obtaining external magnetic field distribution B of the lithium ion battery in the internal short circuit state under the rest state by the step test of the step 1 isc (i，j)。
Step 2, according to the test results before and after the internal short circuit in the battery rest state, obtaining the relative change distribution delta B (i, j) of the external magnetic field of the battery before and after the internal short circuit, delta B (i, j) =B isc (i，j)-B 0 (i, j) to eliminate magnetic field disturbances generated outside the current density.
In this embodiment, the external magnetic field relative change Δb (i, j) between test results at different time points in the actual use process is simulated according to the external magnetic field relative change Δb (i, j) results before and after triggering the internal short circuit.
Step 3, calculating and solving the magnetic field component delta B of the external magnetic field relative change distribution delta B (i, j) according to the external magnetic field relative change distribution before and after the internal short circuit in the rest state of the lithium ion battery in step 2 x (i, j) and ΔB y (i, j) gradient distribution in y and x directions, respectivelyAnd->
In this embodiment, according to the gradient distribution diagram of the external magnetic field after triggering the internal short circuit and before the internal short circuit of the lithium ion battery in step 2, as shown in fig. 3 (a) and (b). FIG. 3 (a) shows the relative change of the magnetic field component in the battery rest stateΔB x Gradient distribution of (i, j)FIG. 3 (B) relative change in magnetic field component ΔB in battery rest state y Gradient distribution of (i, j)
Step 4, gradient distribution of magnetic field components of the tested battery according to the step 3And->All the gradient abrupt changes occur in the same area, and all the gradient direction reversals occur along the axial direction, so that the battery can be judged to have internal short circuit in the area.
In this embodiment, according to the gradient distribution of the relative change of the external magnetic field components obtained before and after the internal short circuit of the lithium ion battery, it can be seen from fig. 3 (a) and (b) that the battery has obvious local magnetic field gradient direction abrupt change and direction reversal near the center position, and the gradient of the relative change of the external magnetic field caused by the convergence/divergence of the internal current density of the battery increases abruptly, so that the internal short circuit of the battery can be determined, and in addition, the influence range of the internal short circuit region of the battery can be determined according to the shape of the gradient change.
Example 2:
the invention provides a nondestructive testing method for internal short circuit of a lithium ion battery based on magnetic field gradient distribution, which is shown in figure 1 and comprises the following specific steps:
and step 1, detecting the distribution of the plane magnetic field on the surface of the battery to be detected by adopting a magnetic sensor at any time interval in a 0.1C constant current charging state.
In this embodiment, the measured battery is a commercial lithium ion soft package battery with a nominal capacity of 4Ah, and fig. 2 is a placement diagram of the measured battery; the magnetic field distribution testing equipment adopts a multi-axis mobile platform load three-axis fluxgate sensor to scan and test the tested battery; the external magnetic field shielding adopts a 5-layer magnetic shielding barrel for magnetic shielding protection.
In order to test the distribution change of the external magnetic field before and after the internal short circuit of the lithium ion battery, the local diaphragm is replaced by paraffin in the embodiment, and the internal short circuit is triggered by heating to simulate the state of the real internal short circuit battery.
According to the test method in the step 1, firstly, an external magnetic field test is carried out on a lithium ion battery which is not triggered by internal short circuit in a 0.1C constant current charging state to obtain B 0 (i, j), then melting paraffin wax by a heating mode to trigger internal short circuit of the battery, and obtaining external magnetic field distribution B of the lithium ion battery in an internal short circuit state under a 0.1C constant current charging state by the step test of the step 1 isc (i，j)。
Step 2, according to the test result before and after the internal short circuit in the 0.1C constant current charging state of the battery, obtaining the relative change distribution delta B (i, j) of the external magnetic field of the battery before and after the internal short circuit, delta B (i, j) =B isc (i，j)-B 0 (i, j) to eliminate magnetic field disturbances generated outside the current density.
In this embodiment, the external magnetic field relative change Δb (i, j) between test results at different time points in the actual use process is simulated according to the external magnetic field relative change Δb (i, j) results before and after triggering the internal short circuit.
Step 3, calculating and solving the magnetic field component delta B of the external magnetic field relative change distribution delta B (i, j) according to the external magnetic field relative change distribution before and after the internal short circuit in the 0.1C constant current charging state of the lithium ion battery in the step 2 x (i, j) and ΔB y (i, j) gradient distribution in y and x directions, respectivelyAnd->
In this embodiment, according to the gradient distribution diagram of the external magnetic field after triggering the internal short circuit and before the internal short circuit of the lithium ion battery in step 2, as shown in fig. 3 (c) and (d). FIG. 3 (C) shows the relative change ΔB of the magnetic field component in the 0.1C constant current charge state of the battery x (i，j) Gradient distribution of (2)FIG. 3 (d) relative change in magnetic field component of battery 0.1C constant current state of charge ΔB y Gradient profile of (i, j)>
Step 4, gradient distribution of magnetic field components of the tested battery according to the step 3And->All the gradient abrupt changes occur in the same area, and all the gradient direction reversals occur along the axial direction, so that the battery can be judged to have internal short circuit in the area.
In this embodiment, according to the gradient distribution of the relative change of the external magnetic field components obtained before and after the internal short circuit of the lithium ion battery, it is known from fig. 3 (c) and (d) that the battery has significant local magnetic field gradient direction abrupt change and direction reversal near the center position, and this gradient abrupt increase of the relative change of the external magnetic field due to the convergence/divergence of the internal current density of the battery can determine that the internal short circuit of the battery occurs, and in addition, the influence range of the internal short circuit region of the battery can be determined according to the shape of the gradient change.
Example 3:
the invention provides a nondestructive testing method for internal short circuit of a lithium ion battery based on magnetic field gradient distribution, which is shown in figure 1 and comprises the following specific steps:
and 1, in the 0.1C constant current discharge process, detecting the plane magnetic field distribution of the surface of the battery to be detected by adopting a magnetic sensor at any time interval.
In this embodiment, the measured battery is a commercial lithium ion soft package battery with a nominal capacity of 4Ah, and fig. 2 is a placement diagram of the measured battery; the magnetic field distribution testing equipment adopts a multi-axis mobile platform load three-axis fluxgate sensor to scan and test the tested battery; the external magnetic field shielding adopts a 5-layer magnetic shielding barrel for magnetic shielding protection.
In order to test the distribution change of the external magnetic field before and after the internal short circuit of the lithium ion battery, the local diaphragm is replaced by paraffin in the embodiment, and the internal short circuit is triggered by heating to simulate the state of the real internal short circuit battery.
According to the test method in the step 1, firstly, an external magnetic field test is carried out on a lithium ion battery which is not triggered by internal short circuit in a 0.1C constant current discharge state to obtain B 0 (i, h), then melting paraffin wax by heating to trigger internal short circuit of the battery, and obtaining external magnetic field distribution B of the lithium ion battery in 0.1C constant current discharge state in the internal short circuit state by step 1 step test isc (i，j)。
Step 2, according to the test result before and after the internal short circuit in the 0.1C constant current discharge state of the battery, obtaining the relative change distribution delta B (i, j) of the external magnetic field of the battery before and after the internal short circuit, delta B (i, j) =B isc (i，j)-B 0 (i, j) to eliminate magnetic field disturbances generated outside the current density.
In this embodiment, the external magnetic field relative change Δb (i, h) between test results at different time points in the actual use process is simulated according to the external magnetic field relative change Δb (i, h) results before and after triggering the internal short circuit.
Step 3, calculating and solving the magnetic field component delta B of the external magnetic field relative change distribution delta B (i, j) according to the external magnetic field relative change distribution before and after the internal short circuit in the 0.1C constant current discharge state of the lithium ion battery in the step 2 x (i, j) and ΔB y (i, j) gradient distribution in y and x directions, respectivelyAnd->
In this embodiment, according to the gradient distribution diagram of the external magnetic field after triggering the internal short circuit and before the internal short circuit of the lithium ion battery in step 2, as shown in fig. 3 (e) and (f). FIG. 3 (e) shows the relative change ΔB of the magnetic field component in the 0.1C constant current discharge state of the battery x (i, j) ladderDegree distributionFIG. 3 (f) relative change in magnetic field component at 0.1C constant current discharge state of Battery ΔB y Gradient profile of (i, j)>
Step 4, gradient distribution of magnetic field components of the tested battery according to the step 3And->All the gradient abrupt changes occur in the same area, and all the gradient direction reversals occur along the axial direction, so that the battery can be judged to have internal short circuit in the area.
In this embodiment, according to the gradient distribution of the relative change of the external magnetic field components obtained before and after the internal short circuit of the lithium ion battery, it is known from fig. 3 (e) and (f) that the battery has significant local magnetic field gradient direction abrupt change and direction reversal near the center position, and this gradient abrupt increase of the relative change of the external magnetic field due to the convergence/divergence of the internal current density of the battery can determine that the internal short circuit of the battery occurs, and in addition, the influence range of the internal short circuit region of the battery can be determined according to the shape of the gradient change.
The invention realizes the detection of the short circuit site and the development degree in the battery by detecting the abnormal distribution of the external magnetic field of the battery under different states. Compared with the detection method based on the electrical characteristic abnormality, the method can accurately judge the type of the internal short circuit fault through the abnormal distribution change of the external magnetic field characteristics caused by the internal short circuit, prevent fault misjudgment, accurately determine the occurrence position of the internal short circuit and provide effective data support for subsequent fault tracing and battery design improvement.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. The non-destructive testing method for the internal short circuit of the battery based on the gradient distribution of the magnetic field is characterized by comprising the following steps:
step one, adopting a magnetic sensor to distribute an external magnetic field B of a battery to be tested in a constant current charging state, a constant current discharging state or a rest state of the battery n (i, j) performing any time interval detection;
step two, according to the detection results of different time points in the constant current charge state, the constant current discharge state or the rest state of the battery, obtaining the relative change distribution delta B (i, j) of the external magnetic field under the corresponding working condition state of the battery;
step three, calculating the gradient distribution of the magnetic field components of the external magnetic field in the y and x directions respectively under the corresponding working conditions of the batteries at different time pointsAnd->
Step four, if the gradient distribution of the magnetic field components of the battery to be testedAnd->Gradient abrupt changes occur in the same area, and if gradient direction inversion occurs along the axial direction, the battery can be judged to have internal short circuit in the area;
wherein, the plane formed by the width direction and the length direction of the battery is an x-y plane, i, j represents the coordinate of any point in the x-y plane of the battery, and delta B x (i，j)、ΔB y (i, j) are the magnetic field components of Δb (i, j) orthogonally resolved in the x-direction and the y-direction, respectively.
2. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: and judging the severity of the internal short circuit according to the size of the gradient edge of the short circuit site and the intensity of the gradient, wherein the larger the outline of the gradient edge of the short circuit site is, the larger the short circuit area is judged, and the higher the intensity of the gradient of the short circuit site is, the larger the short circuit current is, and the more serious the short circuit is.
3. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: in the second step, the calculation method of the relative change distribution Δb (i, j) of the external magnetic field under the corresponding working condition of the battery is Δb (i, j) =b n (i，j)-B n-1 (i, j) wherein B n (i, j) and B n-1 (i, j) are the external magnetic field distributions of the battery to be tested obtained by the nth test and the n-1 th test, respectively.
4. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: the magnetic sensor includes a hall sensor, a fluxgate sensor, a giant magneto-resistance sensor, or an anisotropic magneto-resistance sensor.
5. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: in the first step, during the magnetic field detection process, the magnetic shielding equipment is used for carrying out magnetic shielding protection on the battery to be tested.
6. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: the battery is a laminated battery or a wound battery.
7. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: in the first step, when the external magnetic field of the tested battery is tested, the surface of the battery or the plane with a fixed height from the surface of the battery is tested.
8. The method for non-destructive testing of short circuit in a battery based on magnetic field gradient distribution according to claim 1, wherein the method comprises the steps of: in the first step, when testing the external magnetic field of the tested battery, a single magnetic sensor is used for scanning test or a plurality of identical magnetic sensors are used for covering test to form an array.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117936949A (en) * | 2024-03-22 | 2024-04-26 | 深圳玖逸行新能源汽车技术有限公司 | Rapid intelligent detection maintenance system for new energy automobile battery pack |
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| CN117936949A (en) * | 2024-03-22 | 2024-04-26 | 深圳玖逸行新能源汽车技术有限公司 | Rapid intelligent detection maintenance system for new energy automobile battery pack |
| CN117936949B (en) * | 2024-03-22 | 2024-06-07 | 深圳玖逸行新能源汽车技术有限公司 | Rapid intelligent detection maintenance system for new energy automobile battery pack |
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