Battery foreign matter detection method and device, and storage medium

Abstract

The application discloses a battery foreign matter detection method and device and a storage medium, and the method comprises the following steps: qualitatively detecting the surface elements of a battery roll core to obtain surface component distribution information of the battery roll core; when no foreign matter exists in the battery roll core, quantitatively detecting the surface elements of the battery roll core according to the surface component distribution information to obtain surface component content information of the battery roll core; and judging whether foreign matter exists in the battery roll core according to the surface component content information. Thus, the battery foreign matter detection is performed by combining element qualitative analysis and quantitative analysis, and the standardized detection of foreign matter can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, and in particular to a battery foreign matter detection method, device and storage medium. BACKGROUND

[0002] In the battery production process, metal or non-metal foreign matters are easily mixed into the battery cell due to problems such as raw material purity and processing technology. The foreign matters can cause short circuit of the battery cell. For example, when the size of the foreign matter is large, it can directly pierce the diaphragm of the battery cell, causing short circuit between the positive and negative electrodes of the battery cell. Or, in the battery formation process, the foreign matter is deposited on the surface of the positive or negative electrode of the battery cell due to electrochemical reaction and other reasons, causing the diaphragm of the battery cell to be pierced, and further causing short circuit between the positive and negative electrodes of the battery cell. Since the battery cell short circuit will have safety hazards, it is necessary to detect the foreign matter mixed into the battery cell.

[0003] In the related art, whether the battery cell contains foreign matter is mainly detected based on parameters such as current, voltage, resistance, and current change rate, voltage change rate. However, these methods do not have a unified detection standard. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a battery foreign matter detection method, which detects the foreign matter in the battery by combining qualitative analysis and quantitative analysis of elements, and can realize standardized detection of the foreign matter.

[0005] The second object of the present application is to provide a battery foreign matter detection device.

[0006] The third object of the present application is to provide a computer-readable storage medium.

[0007] To achieve the above object, the first embodiment of the present application provides a battery foreign matter detection method, comprising: qualitatively detecting the surface elements of the battery cell core to obtain surface composition distribution information of the battery cell core; determining whether there is foreign matter in the battery cell core according to the surface composition distribution information; quantitatively detecting the surface elements of the battery cell core to obtain surface composition content information of the battery cell core; and determining whether there is foreign matter in the battery cell core according to the surface composition content information.

[0008] The battery foreign matter detection method according to the embodiment of the present application firstly performs qualitative detection on the surface elements of the battery roll core to obtain the surface composition distribution information of the battery roll core, then determines that there is no foreign matter in the battery roll core according to the surface composition distribution information, and then performs quantitative detection on the surface elements of the battery roll core to obtain the surface composition content information of the battery roll core, and finally determines whether there is foreign matter in the battery roll core according to the surface composition content information. Thus, the battery foreign matter detection is performed by combining the element qualitative analysis and quantitative analysis, and the standardized detection of the foreign matter can be realized.

[0009] According to one embodiment of the present application, the determination that there is no foreign matter in the battery roll core according to the surface composition distribution information comprises: when it is determined that the surface element composition of the battery roll core is consistent with the preset roll core body element composition according to the surface composition distribution information, it is determined that there is no foreign matter in the battery roll core.

[0010] According to one embodiment of the present application, the determination that there is no foreign matter in the battery roll core according to the surface composition content information comprises: determining whether the content of each element on the surface of the battery roll core matches the content of each element in the preset roll core body according to the surface composition content information; when the content of any element on the surface of the battery roll core does not match the content of the element in the preset roll core body, it is determined that there is foreign matter in the battery roll core; and when the content of each element on the surface of the battery roll core matches the content of each element in the preset roll core body, it is determined that there is no foreign matter in the battery roll core.

[0011] According to one embodiment of the present application, when it is determined that there is foreign matter in the battery roll core according to the surface composition content information, the method further comprises: determining the content of the foreign matter corresponding to the unmatched element, and calculating the size of the foreign matter according to the content of the foreign matter.

[0012] According to one embodiment of the present application, in the process of performing quantitative detection on the surface elements of the battery roll core, if there is foreign matter in the battery roll core, the position of the foreign matter is further determined, the size standard of the foreign matter is determined according to the position of the foreign matter, and it is determined that there is a safety hazard in the battery when the size of the foreign matter exceeds the size standard of the foreign matter.

[0013] According to one embodiment of the present application, after obtaining the surface composition distribution information of the battery roll core, the method further comprises: when it is determined that the surface element composition of the battery roll core is inconsistent with the preset roll core body element composition according to the surface composition distribution information, it is determined that there is foreign matter in the battery roll core, and the surface elements of the battery roll core are subjected to quantitative detection to determine the content of the foreign matter corresponding to the inconsistent element, and the size of the foreign matter is calculated according to the content of the foreign matter.

[0014] According to one embodiment of the present application, in the process of performing quantitative detection on the surface elements of the battery roll core, the position of the foreign matter is further determined, the size standard of the foreign matter is determined according to the position of the foreign matter, and it is determined that there is a safety hazard in the battery when the size of the foreign matter exceeds the size standard of the foreign matter.

[0015] According to one embodiment of the present application, calculating the foreign matter size according to the foreign matter content comprises: calculating the foreign matter volume according to the foreign matter content, and calculating the foreign matter diameter according to the foreign matter volume to take the foreign matter diameter as the foreign matter size.

[0016] According to one embodiment of the present application, the foreign matter position comprises that the foreign matter is between two winding cores or the foreign matter is inside the winding core, wherein determining the foreign matter size standard according to the foreign matter position comprises: when the foreign matter is between two winding cores, determining the foreign matter size standard according to the separator thickness between the winding cores and the winding core thickness; when the foreign matter is inside the winding core, determining the foreign matter size standard according to the separator thickness between the winding cores.

[0017] To achieve the above object, the second aspect of the present application provides a battery foreign matter detection device, comprising: a qualitative detection module, configured to perform qualitative detection on surface elements of a battery winding core to obtain surface component distribution information of the battery winding core; a judgment module, configured to determine whether there is foreign matter in the battery winding core according to the surface component distribution information; a quantitative detection module, configured to perform quantitative detection on the surface elements of the battery winding core to obtain surface component content information of the battery winding core when the judgment module determines that there is no foreign matter in the battery winding core according to the surface component distribution information; and the judgment module is further configured to determine whether there is foreign matter in the battery winding core according to the surface component content information.

[0018] The battery foreign matter detection device according to the embodiment of the present application performs qualitative detection on the surface elements of the battery winding core through the qualitative detection module to obtain the surface component distribution information of the battery winding core, and determines whether there is foreign matter in the battery winding core according to the surface component distribution information through the judgment module, and performs quantitative detection on the surface elements of the battery winding core through the quantitative detection module when the judgment module determines that there is no foreign matter in the battery winding core according to the surface component distribution information to obtain the surface component content information of the battery winding core, and determines whether there is foreign matter in the battery winding core according to the surface component content information through the judgment module. Thus, the battery foreign matter detection is performed by combining the qualitative analysis and quantitative analysis of the elements, and the standardized detection of the foreign matter can be realized.

[0019] According to one embodiment of the present application, the judgment module is further configured to determine that there is no foreign matter in the battery winding core when the surface element components of the battery winding core are consistent with the preset winding core body element components according to the surface component distribution information.

[0020] According to one embodiment of the present application, the judging module is further configured to determine whether the content of each element on the surface of the battery roll core matches the preset content of each element in the roll core body according to the surface composition content information; when the content of any one element on the surface of the battery roll core does not match the preset content of the element in the roll core body, it is determined that there is a foreign object in the battery roll core; and when the content of each element on the surface of the battery roll core matches the preset content of each element in the roll core body, it is determined that there is no foreign object in the battery roll core.

[0021] According to one embodiment of the present application, the judging module is further configured to, when it is determined that there is a foreign object in the battery roll core according to the surface composition content information, determine the content of the foreign object corresponding to the unmatched element, and calculate the size of the foreign object according to the content of the foreign object.

[0022] According to one embodiment of the present application, the judging module is further configured to, in the process of quantitative detection of the surface elements of the battery roll core by the quantitative detection module, if there is a foreign object in the battery roll core, determine the position of the foreign object, determine the size standard of the foreign object according to the position of the foreign object, and determine that there is a safety hazard in the battery when the size of the foreign object exceeds the size standard of the foreign object.

[0023] According to one embodiment of the present application, the judging module is further configured to, when it is determined that the surface element composition of the battery roll core does not match the preset roll core body element composition according to the surface composition distribution information, determine that there is a foreign object in the battery roll core, and perform quantitative detection of the surface elements of the battery roll core by the quantitative detection module to determine the content of the foreign object corresponding to the inconsistent element, and calculate the size of the foreign object according to the content of the foreign object.

[0024] According to one embodiment of the present application, the judging module is further configured to, in the process of quantitative detection of the surface elements of the battery roll core by the quantitative detection module, determine the position of the foreign object, determine the size standard of the foreign object according to the position of the foreign object, and determine that there is a safety hazard in the battery when the size of the foreign object exceeds the size standard of the foreign object.

[0025] According to one embodiment of the present application, the judging module is further configured to calculate the volume of the foreign object according to the content of the foreign object, and calculate the diameter of the foreign object according to the volume of the foreign object, so as to take the diameter of the foreign object as the size of the foreign object.

[0026] According to one embodiment of the present application, the position of the foreign object includes that the foreign object is located between two roll cores or the foreign object is located inside the roll core, wherein the judging module is further configured to, when the foreign object is located between two roll cores, determine the size standard of the foreign object according to the thickness of the separator between the roll cores and the thickness of the roll core; and when the foreign object is located inside the roll core, determine the size standard of the foreign object according to the thickness of the separator between the roll cores.

[0027] To achieve the above object, the third aspect of the present application provides a computer readable storage medium, having stored thereon a battery foreign matter detection program, which, when executed by a processor, implements the above-mentioned battery foreign matter detection method.

[0028] The computer readable storage medium according to the embodiment of the present application, having stored thereon a battery foreign matter detection program, which, when executed by a processor, implements the above-mentioned battery foreign matter detection method, can realize the standardized detection of foreign matters by adopting the combination of qualitative analysis and quantitative analysis of elements for battery foreign matter detection.

[0029] Additional aspects and advantages of the present application will be described in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Flow chart of the battery foreign matter detection method according to the first embodiment of the present application;

[0031] Figure 2 Flow chart of the battery foreign matter detection method according to the second embodiment of the present application;

[0032] Figure 3 Cross-sectional view of the foreign matter located between the winding cores according to an embodiment of the present application;

[0033] Figure 4 Cross-sectional view of the foreign matter located inside the winding cores according to an embodiment of the present application;

[0034] Figure 5 Flow chart of the battery foreign matter detection method according to a specific example of the present application;

[0035] Figure 6 Structure schematic diagram of the battery foreign matter detection device according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0037] The battery foreign matter detection method and device proposed by the embodiments of the present application are described below with reference to the accompanying drawings.

[0038] Figure 1 Flow chart of the battery foreign matter detection method according to the first embodiment of the present application, as shown in Figure 1 , the battery foreign matter detection method can include:

[0039] In step S101, qualitative detection is performed on the surface elements of the battery roll core to obtain surface composition distribution information of the battery roll core.

[0040] Specifically, when performing battery foreign matter detection, qualitative detection can be performed on the battery roll core first. The so-called qualitative detection refers to detection on the "quality" of the battery roll core, and is mainly used to identify which elements the battery roll core is composed of, that is, composition detection of the battery roll core. Optionally, a qualitative detection method such as EDS (Energy Dispersive X-Ray Spectroscopy) can be used to perform qualitative detection on the surface elements of the battery roll core to obtain surface composition distribution information of the battery roll core.

[0041] Specifically, taking the EDS qualitative detection method as an example. An electron beam is emitted to the surface of the battery roll core by the EDS, and characteristic X-rays generated when the electron beam interacts with the surface elements of the battery roll core are received. A spectrum is generated according to the characteristic X-rays, and the surface composition distribution information of the battery roll core can be obtained based on the spectrum, wherein the peak value of the spectrum is the surface element composition of the battery roll core.

[0042] After obtaining the surface composition distribution information of the battery roll core, it can be determined whether there is foreign matter in the battery roll core according to the surface composition distribution information. Specifically, it can include: when it is determined according to the surface composition distribution information that the surface element composition of the battery roll core is consistent with the preset roll core body element composition, it is determined that there is no foreign matter in the battery roll core; when it is determined according to the surface composition distribution information that the surface element composition of the battery roll core is inconsistent with the preset roll core body element composition, it is determined that there is foreign matter in the battery roll core.

[0043] Specifically, a general battery roll core is composed of a positive electrode, a negative electrode, and a separator. The positive electrode can be composed of elements such as Al (aluminum), Ni (nickel), Co (cobalt), Mn (manganese), and Fe (iron). The negative electrode can be composed of elements such as graphite, Cu (copper), and Fe (iron). The separator serves as an insulating layer to prevent the positive and negative electrodes from contacting to cause short circuit of the battery roll core, and also serves as a semi-permeable layer to allow small-volume charged ions to pass through to increase the concentration difference near the positive and negative electrodes, thereby improving the battery storage efficiency.

[0044] After the surface composition distribution information of the battery roll core is obtained by the foregoing manner, the surface element composition of the battery roll core can be determined according to the surface composition distribution information. For example, when the surface composition distribution information is an EDS spectrum, the peak value of the spectrum is the surface element composition of the battery roll core. Then, the surface element composition is compared with the preset roll core body element composition. For example, when the preset roll core body element composition is Al, Ni, Co, Mn, Fe, graphite and Cu, if the detected surface element composition is also Al, Ni, Co, Mn, Fe, graphite and Cu, it is determined that the surface element composition of the battery roll core is consistent with the preset roll core body element composition, and it is determined that there is no foreign matter in the battery roll core. If the detected surface element composition is Al, Ni, Co, Mn, Fe, graphite, Cu and other metals or non-metals, it is determined that the surface element composition of the battery roll core is inconsistent with the preset roll core body element composition, and it is determined that there is foreign matter in the battery roll core. That is, when a non-roll core body element is detected, it is determined that there is foreign matter in the battery roll core, and when the detected element is the same as the roll core body element, it is determined that there is no foreign matter in the battery roll core.

[0045] In step S102, when it is determined that there is no foreign matter in the battery roll core according to the surface composition distribution information, the surface element of the battery roll core is quantitatively detected to obtain the surface composition content information of the battery roll core.

[0046] Specifically, when the qualitative detection of the battery roll core is performed and it is determined that there is no foreign matter in the battery roll core according to the detection result, the quantitative detection of the battery roll core is further performed. The quantitative detection refers to the detection of the content of the battery roll core, which is mainly used to obtain the content of each element in the battery roll core, that is, the content detection of the battery roll core. Optionally, the surface element of the battery roll core can be quantitatively detected by using an ICP (Inductive Coupled Plasma Emission Spectrometer) quantitative detection method to obtain the surface composition content information of the battery roll core.

[0047] Specifically, taking the ICP quantitative detection method as an example. The light source of the ICP irradiates the surface of the battery roll core. At this time, the surface elements of the battery roll core are evaporated and dissociated into gaseous atoms and are excited. Due to the different atomic structures of each element, many spectrum line groups arranged in a certain wavelength order, that is, characteristic spectrum lines, can be generated under the excitation of the light source. According to the characteristic spectrum lines, the surface composition content information of the battery roll core can be obtained. For example, the content of each element on the surface of the battery roll core is calculated according to the spectrum line intensity of the characteristic spectrum lines.

[0048] In step S103, whether there is foreign matter in the battery roll core is determined according to the surface composition content information.

[0049] Specifically, after obtaining the surface composition content information of the battery roll core, it can be determined whether there is a foreign matter in the battery roll core according to the surface composition content information. Optionally, determining whether there is a foreign matter in the battery roll core according to the surface composition content information includes: determining whether the content of each element on the surface of the battery roll core matches the content of each element in the preset roll core body according to the surface composition content information; when the content of any one element on the surface of the battery roll core does not match the content of the element in the preset roll core body, it is determined that there is a foreign matter in the battery roll core; when the content of each element on the surface of the battery roll core matches the content of each element in the preset roll core body, it is determined that there is no foreign matter in the battery roll core.

[0050] For example, when the preset roll core body element composition is Al, Ni, Co, Mn, Fe, graphite and Cu, if the detected surface element composition is also Al, Ni, Co, Mn, Fe, graphite and Cu, it is preliminarily determined that there is no foreign matter in the battery roll core based on qualitative detection, at this time, the surface element of the battery roll core is subjected to quantitative detection, if the content of each element obtained by detection is consistent with the content of each element in the preset roll core body, it is determined that there is no foreign matter in the battery roll core; otherwise, it is determined that there is a foreign matter in the battery roll core, for example, when the detected Fe content exceeds the Fe content in the preset roll core body, it indicates that there is a foreign matter Fe.

[0051] Therefore, when it is determined that the surface element composition of the battery roll core is consistent with the preset roll core body element composition based on qualitative analysis, it can be further determined whether there is a foreign matter in the battery roll core through quantitative analysis.

[0052] In the above embodiment, during the battery foreign matter detection, the battery foreign matter detection is performed by combining element qualitative analysis and quantitative analysis. Since the qualitative analysis and the quantitative analysis are both based on the roll core body element for foreign matter judgment, that is, there is a unified detection standard, the standardization of the foreign matter detection can be realized.

[0053] Further, the battery has a foreign matter, which is relatively common and allowed, but the prerequisite is that the foreign matter is small, and if the foreign matter is large, it will pierce the positive and negative electrodes of the battery roll core, causing the battery to short circuit. Therefore, the size of the foreign matter is limited during the production of the battery. However, since there is no specific standard for the size of the foreign matter at present, it leads to cost waste when the size of the foreign matter is too strictly required, and it leads to a safety hazard of the battery when the size of the foreign matter is too widely required. Therefore, a foreign matter size calibration method is also provided in the present application to determine the foreign matter size standard, and whether the foreign matter will cause a safety hazard of the battery is determined based on the foreign matter size standard.

[0054] Figure 2 For the flowchart of the battery foreign matter detection method according to the second embodiment of the present application, refer to FIG. 8. Figure 2 As shown in FIG. 8, the battery foreign matter detection method can include:

[0055] In step S201, qualitative detection is performed on the surface elements of the battery roll core to obtain surface composition distribution information of the battery roll core.

[0056] Specifically, when performing the battery foreign matter detection, qualitative detection can be performed on the surface elements of the battery roll core to obtain surface composition distribution information of the battery roll core, and whether there is foreign matter in the battery roll core is determined according to the surface composition distribution information. When it is determined according to the surface composition distribution information that the composition of the surface elements of the battery roll core is consistent with the preset roll core body element composition, it is determined that there is no foreign matter in the battery roll core, and step S202 is directly performed. When it is determined according to the surface composition distribution information that the composition of the surface elements of the battery roll core is inconsistent with the preset roll core body element composition, it is determined that there is foreign matter in the battery roll core, and quantitative detection is performed on the surface elements of the battery roll core to determine the foreign matter content corresponding to the inconsistent elements, and the foreign matter size is calculated according to the foreign matter content. Optionally, the foreign matter size is calculated according to the foreign matter content, including: calculating the foreign matter volume according to the foreign matter content, and calculating the foreign matter diameter according to the foreign matter volume, so as to take the foreign matter diameter as the foreign matter size.

[0057] For example, when the preset roll core body element composition is Al, Ni, Co, Mn, Fe, graphite and Cu, if the detected surface element composition is also Al, Ni, Co, Mn, Fe, graphite and Cu, step S202 is directly performed. If the detected surface element composition is Al, Ni, Co, Mn, Fe, graphite, Cu and Ca, quantitative detection is performed on the surface elements of the battery roll core by using ICP or other quantitative detection methods to obtain the Ca content, i.e., the foreign matter content (assuming that the content of other elements detected at present is consistent with the content of each element of the preset roll core body). Assuming that the foreign matter content is 0.02%, and the weight of the battery roll core is 0.05g, the weight of the foreign matter is 0.02%*0.05=0.00001g. Since the density of Ca is 1.55g / cm 3 , the volume of the foreign matter is 0.00001 / 1.55=0.00645mm 3 . According to the volume calculation formula V=(4 / 3)*πr 3 , the radius r of the foreign matter can be calculated as 0.115mm, and the size of the foreign matter is 0.23mm.

[0058] Further, in some embodiments, in the process of performing quantitative detection on the surface elements of the battery roll core, the position of the foreign matter is also determined, the foreign matter size standard is determined according to the position of the foreign matter, and it is determined that the battery has a safety hazard when the foreign matter size exceeds the foreign matter size standard.

[0059] Specifically, taking the ICP quantitative detection method as an example, when performing quantitative detection of surface elements of battery cores based on ICP, not only can the content of foreign matter be detected, but also the location of foreign matter can be detected. Then, the size standard of foreign matter is determined based on the location of foreign matter, and the calculated size of foreign matter is compared with the size standard. If the size of foreign matter exceeds the size standard, it is determined that the battery has a safety hazard.

[0060] In some embodiments, the location of the foreign object includes the foreign object being located between two cores or inside the core, wherein determining the foreign object size standard based on the location of the foreign object includes: when the foreign object is located between two cores, determining the foreign object size standard based on the thickness of the diaphragm between the cores and the core thickness; when the foreign object is located inside the core, determining the foreign object size standard based on the thickness of the diaphragm between the cores.

[0061] Specifically, the location of foreign objects can be divided into two types: one is located between two cores, and the other is located inside the core. When the foreign object is located between two cores, its size standard can be determined based on the thickness of the diaphragm between the cores and the core thickness. For example, in... Figure 3 In the example shown, when the foreign object is small, it will not puncture the separators on both sides, and the battery poses no safety hazard. When the foreign object is large, such as puncturing the three separators and the negative electrode, the positive and negative electrodes of the battery core will short-circuit, posing a safety hazard. Therefore, it can be determined that when the foreign object is located between two cores, the critical value for the size of the foreign object that causes a short circuit is the sum of the thicknesses of the three separators and the negative electrode. In other words, when the size of the foreign object is greater than or equal to the sum of the thicknesses of the three separators and the negative electrode, the battery is considered to have a safety hazard, while when the size of the foreign object is smaller than the sum of the thicknesses of the three separators and the negative electrode, the battery is considered to have no safety hazard. Thus, it can be determined that the standard size for the foreign object located between two cores is the sum of the thicknesses of the three separators and the negative electrode.

[0062] When foreign objects are located inside the core, their size can be determined based on the thickness of the diaphragms between the cores. For example, in Figure 4 In the example shown, when the foreign object is small, it will not puncture the adjacent separator, and the battery poses no safety hazard. When the foreign object is large, if it punctures the adjacent separator, the positive and negative terminals of the battery core will short-circuit, posing a safety hazard. Therefore, it can be determined that when the foreign object is located inside the core, the critical value for the size of the foreign object that causes a short circuit is the thickness of one separator layer. In other words, when the size of the foreign object is greater than or equal to the thickness of one separator layer, the battery is considered to have a safety hazard, while when the size of the foreign object is less than the thickness of one separator layer, the battery is considered to have no safety hazard. Thus, it can be determined that the standard size for the foreign object when it is located inside the core is the thickness of one separator layer.

[0063] It should be noted that, Figure 3 andFigure 4 For example, when the foreign matter is located between the winding cores, the corresponding foreign matter size standard is 0.162 mm. Since the calculated size of the foreign matter is 0.23 mm, which exceeds the foreign matter size standard, it is determined that the battery has a safety hazard. When the foreign matter is located inside the winding core, the corresponding foreign matter size standard is 0.016 mm. Since the calculated size of the foreign matter is 0.23 mm, which exceeds the foreign matter size standard, it is determined that the battery has a safety hazard.

[0064] Thus, by analyzing the structure of the battery winding core and the reason why the foreign matter causes the battery to have a safety hazard, the quantification of the foreign matter size standard can be achieved, so that there is a standard for the size of the foreign matter, thereby avoiding the lack of a specific standard for the size of the foreign matter, which leads to cost waste when the size of the foreign matter is too strict, and leads to a safety hazard of the battery when the size of the foreign matter is too broad.

[0065] Step S202, according to the surface composition distribution information, when the surface element composition of the battery winding core is consistent with the preset winding core body element composition, it is determined that there is no foreign matter in the battery winding core, and the surface element of the battery winding core is quantitatively detected to obtain the surface composition content information of the battery winding core. For details, refer to step S102.

[0066] Specifically, when the surface element composition of the battery winding core is consistent with the preset winding core body element composition according to the surface composition distribution information, it is determined that there is no foreign matter in the battery winding core, and the surface element of the battery winding core is quantitatively detected to obtain the surface composition content information of the battery winding core. For details, refer to step S102.

[0067] Step S203, according to the surface composition content information, it is determined whether there is a foreign matter in the battery winding core.

[0068] Specifically, after obtaining the surface composition content information of the battery winding core, it is determined whether there is a foreign matter in the battery winding core according to the surface composition content information. For details, refer to step S103.

[0069] Step S204, when it is determined that there is a foreign matter in the battery winding core according to the surface composition content information, the foreign matter content corresponding to the mismatched element is determined, and the size of the foreign matter is calculated according to the foreign matter content.

[0070] Specifically, when it is determined according to the surface composition content information that there is a foreign matter in the battery roll core, the content of the foreign matter corresponding to the mismatched element is further determined, and the size of the foreign matter is calculated according to the content of the foreign matter. For example, when the preset element composition of the roll core body is Al, Ni, Co, Mn, Fe, graphite and Cu, if the qualitative detection of the surface element composition of the battery roll core is also Al, Ni, Co, Mn, Fe, graphite and Cu, the quantitative detection of the content of each element on the surface of the battery roll core is further performed, and the detected content of each element on the surface is compared with the preset content of each element of the roll core body. If the content of Fe in the detected surface elements is higher than the content of Fe in the roll core body, it is determined that the foreign matter is Fe, and the size of the foreign matter is calculated according to the content of the foreign matter Fe. Assuming that the detected content of Fe is 0.63%, the content of Fe in the roll core body is 0.45%, and the weight of the battery roll core is 0.05g, then the content of the foreign matter is 0.63%-0.45%=0.18%, the weight of the foreign matter is 0.18%*0.05=0.00009g, and since the density of Fe is 7.89g / cm 3 , the volume of the foreign matter is 0.00009 / 7.89=0.0114mm 3 , the radius r of the foreign matter can be calculated according to the volume calculation formula V=(4 / 3)*pi*r 3 , and the size of the foreign matter is 0.278mm.

[0071] Further, in some embodiments, in the process of quantitatively detecting the surface elements of the battery roll core, if there is a foreign matter in the battery roll core, the position of the foreign matter is also determined, the foreign matter size standard is determined according to the position of the foreign matter, and the battery is determined to have a safety hazard when the size of the foreign matter exceeds the foreign matter size standard.

[0072] That is, in step S202, in the process of quantitatively detecting the surface elements of the battery roll core to obtain the surface composition content information of the battery roll core, if there is a foreign matter in the battery roll core, the position of the foreign matter is also determined. For example, when the surface elements of the battery roll core are quantitatively detected based on ICP, not only the content of the foreign matter can be detected, but also the position of the foreign matter can be detected. Then, the foreign matter size standard is determined according to the position of the foreign matter, and the battery is determined to have a safety hazard when the size of the foreign matter exceeds the foreign matter size standard. For details, please refer to the related description in step S201.

[0073] In the above embodiments, in the battery foreign matter detection, the battery foreign matter is detected by combining the element qualitative analysis and the quantitative analysis, and when it is determined that the battery has the foreign matter, the foreign matter size is determined based on the foreign matter content, the foreign matter size standard is obtained according to the foreign matter position, and whether the battery has the safety hazard is determined according to the foreign matter size and the foreign matter size standard, so that not only the standardized detection of the battery foreign matter can be realized, but also the foreign matter size can be determined, and whether the foreign matter causes the safety hazard of the battery can be determined based on the quantitative foreign matter size standard, which is beneficial to the improvement of the battery production.

[0074] Further, as a specific example, referring to FIG. 1, Figure 5 As shown in FIG. 1, the battery foreign matter detection method can include:

[0075] In step S301, the surface element of the battery roll core is qualitatively detected to obtain the surface component distribution information of the battery roll core.

[0076] In step S302, whether the battery roll core has the foreign matter is determined according to the surface component distribution information. If yes, step S303 is performed; if no, step S304 is performed.

[0077] In step S303, the surface element of the battery roll core is quantitatively detected to determine the foreign matter content and the foreign matter position corresponding to the inconsistent element.

[0078] It should be noted that when there are multiple foreign matters, in this step, the element with the same component as the preset roll core body element but with different content, i.e., the inconsistent element, can also be detected, and the foreign matter content and the foreign matter position corresponding to the inconsistent element are obtained.

[0079] In step S304, the surface element of the battery roll core is quantitatively detected to obtain the surface component content information of the battery roll core.

[0080] In step S305, whether the battery roll core has the foreign matter is determined according to the surface component content information. If yes, step S306 is performed; if no, the detection is ended.

[0081] In step S306, the foreign matter content and the foreign matter position corresponding to the inconsistent element are determined.

[0082] In step S307, the foreign matter size is calculated according to the foreign matter content, the foreign matter size standard is obtained according to the foreign matter position, and whether the battery has the safety hazard is determined according to the foreign matter size and the foreign matter size standard.

[0083] In the above embodiment, based on the core body elements, the foreign matter is detected through qualitative analysis and quantitative analysis of the elements, and when the foreign matter is detected, the foreign matter size is obtained based on the foreign matter content, and the corresponding foreign matter size standard is obtained according to the foreign matter position, and then whether the battery has a safety hazard is determined according to the foreign matter size and the foreign matter size standard, so that the battery foreign matter detection is standardized and quantified, which is beneficial to production.

[0084] Figure 6 FIG. 1 is a structural schematic diagram of a battery foreign matter detection device according to an embodiment of the present application, which comprises a qualitative detection module 10, a judgment module 20 and a quantitative detection module 30. Figure 6

[0085] The qualitative detection module 10 is configured to perform qualitative detection on the surface elements of the battery core to obtain surface composition distribution information of the battery core; the judgment module 20 is configured to determine whether there is foreign matter in the battery core according to the surface composition distribution information; and the quantitative detection module 30 is configured to perform quantitative detection on the surface elements of the battery core to obtain surface composition content information of the battery core when the judgment module determines that there is no foreign matter in the battery core according to the surface composition distribution information; and the judgment module 20 is further configured to determine whether there is foreign matter in the battery core according to the surface composition content information.

[0086] According to an embodiment of the present application, the judgment module 20 is further configured to determine that there is no foreign matter in the battery core when the surface element composition of the battery core is consistent with the preset core body element composition according to the surface composition distribution information.

[0087] According to an embodiment of the present application, the judgment module 20 is further configured to determine whether the content of each element on the surface of the battery core matches the content of each element in the preset core body according to the surface composition content information; to determine that there is foreign matter in the battery core when the content of any element on the surface of the battery core does not match the content of the element in the preset core body; and to determine that there is no foreign matter in the battery core when the content of each element on the surface of the battery core matches the content of each element in the preset core body.

[0088] According to an embodiment of the present application, the judgment module 20 is further configured to determine the content of the foreign matter corresponding to the mismatched element and calculate the size of the foreign matter according to the content of the foreign matter when it is determined that there is foreign matter in the battery core according to the surface composition content information.

[0089] According to an embodiment of the present application, the judgment module 20 is further configured to determine the position of the foreign matter and determine the foreign matter size standard according to the position of the foreign matter if there is foreign matter in the battery core during the quantitative detection of the surface elements of the battery core by the quantitative detection module, and to determine that the battery has a safety hazard when the size of the foreign matter exceeds the foreign matter size standard.​

[0090] According to one embodiment of the present application, the judging module 20 is further configured to determine that there is a foreign matter in the battery roll core when it is determined according to the surface element distribution information that the surface element composition of the battery roll core is inconsistent with the preset roll core body element composition, and to perform quantitative detection on the surface element of the battery roll core by the quantitative detection module to determine the foreign matter content corresponding to the inconsistent element, and to calculate the foreign matter size according to the foreign matter content.

[0091] According to one embodiment of the present application, the judging module 20 is further configured to determine the foreign matter position during the quantitative detection on the surface element of the battery roll core by the quantitative detection module, to determine the foreign matter size standard according to the foreign matter position, and to determine that the battery has a safety hazard when the foreign matter size exceeds the foreign matter size standard.

[0092] According to one embodiment of the present application, the judging module 20 is further configured to calculate the foreign matter volume according to the foreign matter content, and to calculate the foreign matter diameter according to the foreign matter volume to take the foreign matter diameter as the foreign matter size.

[0093] According to one embodiment of the present application, the foreign matter position includes that the foreign matter is located between two roll cores or the foreign matter is located inside a roll core, wherein the judging module 20 is further configured to determine the foreign matter size standard according to the separator thickness between the roll cores and the roll core thickness when the foreign matter is located between the two roll cores, and to determine the foreign matter size standard according to the separator thickness between the roll cores when the foreign matter is located inside the roll core.

[0094] It should be noted that the description of the battery foreign matter detection device in the present application can refer to the description of the battery foreign matter detection method in the present application, which will not be described here in detail.

[0095] The battery foreign matter detection device according to the embodiments of the present application can realize standardized detection of foreign matters by adopting the combination of qualitative analysis and quantitative analysis of elements for battery foreign matter detection.

[0096] In some embodiments, a computer readable storage medium having a battery foreign matter detection program stored thereon is also provided, and the battery foreign matter detection program is executed by a processor to implement the foregoing battery foreign matter detection method.

[0097] The computer readable storage medium according to the embodiments of the present application has a battery foreign matter detection program stored thereon, and the battery foreign matter detection program is executed by a processor to implement the foregoing battery foreign matter detection method, and the combination of qualitative analysis and quantitative analysis of elements is adopted for battery foreign matter detection to realize standardized detection of foreign matters.

[0098] It is to be appreciated that the above description and the examples that follow are intended to be illustrative only and that changes can be made to the description, as represented by the above listed elements, by the steps recited in the flow charts, and by the examples that follow, without departing from the spirit of the application. Accordingly, the scope of the present application is intended to be defined only by the appended claims.

[0099] It should be understood that aspects of the application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following techniques, or combinations thereof, can be utilized to implement the various logic, circuitry, and / or other logic functional elements described herein: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and / or other implementations known to those of skill in the art.

[0100] In the description of the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The appearances of the above terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0101] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying a number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0102] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0103] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for detecting foreign objects in a battery, characterized in that, include: Qualitative detection of surface elements of the battery core is performed to obtain surface composition distribution information of the battery core; When it is determined that there are no foreign objects in the battery core based on the surface composition distribution information, the surface elements of the battery core are quantitatively detected to obtain the surface composition content information of the battery core. The presence of foreign matter in the battery core is determined based on the surface composition content information. Determining whether foreign objects exist in the battery core based on the surface composition content information includes: Based on the surface composition content information, determine whether the content of each element on the surface of the battery core matches the preset content of each element in the core body; When the content of any element on the surface of the battery core does not match the content of that element in the preset core body, it is determined that there is a foreign object in the battery core. When the content of each element on the surface of the battery core matches the content of each element in the preset core body, it is determined that there are no foreign objects in the battery core. During the quantitative detection of surface elements of the battery core, if there are foreign objects in the battery core, the location of the foreign objects is determined, and the size standard of the foreign objects is determined based on the location of the foreign objects. If the size of the foreign objects exceeds the size standard of the foreign objects, it is determined that the battery has a safety hazard. The location of the foreign object includes whether it is located between two cores or inside the core. Determining the size standard of the foreign object based on its location includes: When the foreign object is located between two cores, the size standard of the foreign object is determined based on the thickness of the diaphragm between the cores and the thickness of the cores. When the foreign object is located inside the core, the size standard of the foreign object is determined according to the thickness of the diaphragm between the cores.

2. The battery foreign object detection method according to claim 1, characterized in that, Determining that there are no foreign objects in the battery core based on the surface composition distribution information includes: When the surface elemental composition of the battery core is determined to be consistent with the preset elemental composition of the core body based on the surface composition distribution information, it is determined that there are no foreign objects in the battery core.

3. The battery foreign object detection method according to claim 1, characterized in that, When determining the presence of foreign matter in the battery core based on the surface composition content information, the method further includes: Determine the foreign matter content corresponding to the mismatched element, and calculate the foreign matter size based on the foreign matter content.

4. The battery foreign object detection method according to claim 2, characterized in that, After obtaining the surface composition distribution information of the battery core, the method further includes: When the surface element composition of the battery core is determined to be inconsistent with the preset core body element composition based on the surface component distribution information, it is determined that there is a foreign object in the battery core. The surface elements of the battery core are quantitatively detected to determine the foreign object content corresponding to the inconsistent elements, and the foreign object size is calculated based on the foreign object content.

5. The battery foreign object detection method according to claim 4, characterized in that, During the quantitative detection of surface elements of the battery core, the location of foreign objects is determined, and the size standard of foreign objects is determined based on the location of foreign objects. If the size of the foreign object exceeds the size standard, it is determined that the battery has a safety hazard.

6. The battery foreign object detection method according to claim 3 or 4, characterized in that, Calculating the size of the foreign object based on its content includes: The volume of the foreign object is calculated based on the foreign object content, and the diameter of the foreign object is calculated based on the foreign object volume, so that the foreign object diameter is used as the foreign object size.

7. A battery foreign object detection device, characterized in that, include: The qualitative detection module is used to perform qualitative detection on the surface elements of the battery core to obtain the surface composition distribution information of the battery core. The judgment module is used to determine whether there are foreign objects in the battery core based on the surface composition distribution information; Determining whether foreign objects exist in the battery core based on the surface composition content information includes: Based on the surface composition content information, determine whether the content of each element on the surface of the battery core matches the preset content of each element in the core body; When the content of any element on the surface of the battery core does not match the content of that element in the preset core body, it is determined that there is a foreign object in the battery core. When the content of each element on the surface of the battery core matches the content of each element in the preset core body, it is determined that there are no foreign objects in the battery core. A quantitative detection module is used to quantitatively detect the surface elements of the battery core when the judgment module determines that there are no foreign objects in the battery core based on the surface component distribution information, and to obtain the surface component content information of the battery core. The judgment module is also used to determine whether there are foreign objects in the battery core based on the surface component content information. During the quantitative detection of surface elements of the battery core, if there are foreign objects in the battery core, the location of the foreign objects is determined, and the size standard of the foreign objects is determined based on the location of the foreign objects. If the size of the foreign objects exceeds the size standard of the foreign objects, it is determined that the battery has a safety hazard. The location of the foreign object includes whether it is located between two cores or inside the core. Determining the size standard of the foreign object based on its location includes: When the foreign object is located between two cores, the size standard of the foreign object is determined based on the thickness of the diaphragm between the cores and the thickness of the cores. When the foreign object is located inside the core, the size standard of the foreign object is determined according to the thickness of the diaphragm between the cores.

8. A computer-readable storage medium, characterized in that, It stores a battery foreign object detection program, which, when executed by the processor, implements the battery foreign object detection method according to any one of claims 1-6.

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