Battery cell detection structure and battery

Abstract

The utility model provides a battery cell detection structure and a battery. The battery cell detection structure comprises a roll core; the reference electrode comprises a conductive column and a conductive sheet, and one end of the conductive column is coated with the conductive sheet; wherein one end, coated with the conductive sheet, of the conductive column extends into the roll core, and one end, far away from the conductive sheet, of the conductive column is configured to be connected with a detection circuit outside the roll core. According to the application, the roll core and the reference electrode are arranged, the end, coated with the conducting strip, of the conducting column of the reference electrode extends into the roll core, and the end, away from the conducting strip, of the conducting column is provided with the detection circuit connected with the exterior of the roll core; and the deviation of the winding thickness of the conducting strip relative to the set thickness is less than or equal to 5%, so that the thickness of the conducting strip at any position in the circumferential direction of the conducting column is uniform, the uniformity of current distribution on the surface of the reference electrode can be ensured, and the accuracy of measuring the potential by the reference electrode is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core detection structure and a battery. Background Art

[0002] In the related art, the reference electrode plays an important role as a key element for measuring the potential in the battery. In the battery industry, the uneven thickness of the conductive material on the reference electrode leads to uneven current distribution on the reference electrode surface, thereby reducing the accuracy of the reference electrode in measuring the potential. For example, the reference electrode is usually made by washing the conductive column with an acidic solution and then depositing the conductive material on the conductive column. However, during the deposition of the conductive material, the conductive material may be unevenly distributed. Utility Model Content

[0003] The embodiments of the utility model provide a battery cell detection structure and a battery, which can improve the technical problem of uneven thickness of the conductive material on the reference electrode.

[0004] In the first aspect, an embodiment of the utility model provides a battery cell detection structure, comprising: a winding core; a reference electrode, the reference electrode comprising a conductive column and a conductive sheet, the conductive sheet being coated on one end of the conductive column; wherein the end of the conductive column coated with the conductive sheet extends into the interior of the winding core, and the end of the conductive column away from the conductive sheet is configured to be connected to a detection circuit outside the winding core; wherein the conductive sheet is wound around the conductive column for at least one circle along the circumferential direction of the conductive column, and the deviation of the winding thickness of the conductive sheet at any point along the circumferential direction of the conductive column relative to the set thickness is less than or equal to 5%.

[0005] In some embodiments, the conductive pillar is bonded to the conductive sheet.

[0006] In some embodiments, the thickness of the conductive sheet is 10 to 30 μm; and / or the length of the conductive sheet is 0.1 to 0.2 times the length of the winding core; and / or the width of the conductive sheet is 0.1 to 0.2 times the length of the winding core.

[0007] In some embodiments, the winding core has a pre-rolled structure, which is formed by winding a first diaphragm and a second diaphragm, and at least part of the conductive pillars are adhered to the first diaphragm and / or the second diaphragm.

[0008] In some embodiments, the sticking area of ​​the conductive column is 1 / 10 to 1 / 5 of its own area, the sticking area of ​​the first diaphragm is 1 / 10 to 1 / 5 of the area of ​​the conductive column, and the sticking area of ​​the second diaphragm is 1 / 10 to 1 / 5 of the area of ​​the conductive column.

[0009] In some embodiments, the conductive pillar is a cylindrical pillar, and the diameter of the conductive pillar is 10-30 μm.

[0010] In some embodiments, the conductive pillar is one of a copper wire, a gold wire, a silver wire, and a nickel wire.

[0011] In some embodiments, the conductive sheet is a lithium sheet.

[0012] In some embodiments, the conductive column has a first metal portion and a second metal portion, the conductive sheet wraps the first metal portion, and an insulating layer wraps the outer side of the second metal portion.

[0013] In some embodiments, a thickness of the first metal portion is less than a thickness of the second metal portion; and / or a width of the first metal portion is greater than a width of the second metal portion.

[0014] In some embodiments, the conductive column further includes a third metal portion, one end of the third metal portion is connected to the second metal portion, and the other end of the third metal portion is connected to the detection circuit.

[0015] In some embodiments, the third metal part has a first bending part, a second bending part and a third bending part connected in sequence, the first bending part is perpendicular to the winding core, the second bending part is perpendicular to the first bending part, the third bending part is perpendicular to the first bending part, and the third bending part is perpendicular to the second bending part.

[0016] In some embodiments, one end of the conductive column away from the conductive sheet is encapsulated with an aluminum-plastic film.

[0017] In a second aspect, an embodiment of the utility model provides a battery, wherein the battery includes the above-mentioned battery cell detection structure.

[0018] Beneficial effects of the embodiments of the utility model:

[0019] In an embodiment of the utility model, a winding core and a reference electrode are provided, and one end of the conductive column of the reference electrode covered with a conductive sheet extends into the interior of the winding core, and the end of the conductive column away from the conductive sheet is provided with a detection circuit connected to the outside of the winding core. Since the conductive sheet is wrapped around the conductive column for at least one circle along the circumferential direction of the conductive column, and the deviation of the winding thickness of the conductive sheet relative to the set thickness is less than or equal to 5%, the thickness of the conductive sheet at any point in the circumferential direction of the conductive column is uniform, thereby ensuring the uniformity of the current distribution on the surface of the reference electrode, thereby improving the accuracy of the reference electrode in measuring the potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a three-dimensional schematic diagram of a winding core provided in an embodiment of the utility model;

[0022] Figure 2 It is a three-dimensional schematic diagram of a reference electrode provided in an embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view of a battery cell, a conductive column, a conductive sheet, and an insulating tape provided in an embodiment of the utility model;

[0024] Figure 4 It is a three-dimensional schematic diagram of a conductive column, a conductive sheet and an insulating tape provided by an embodiment of the utility model;

[0025] Figure 5 It is a first stereoscopic schematic diagram of a conductive column provided by an embodiment of the utility model;

[0026] Figure 6 It is a first stereoscopic schematic diagram of a battery cell and a conductive column provided by an embodiment of the utility model;

[0027] Figure 7 It is a second stereoscopic schematic diagram of a battery cell and a conductive column provided by an embodiment of the utility model;

[0028] Figure 8 It is a voltage diagram of a battery cell provided in an embodiment of the utility model.

[0029] In the figure:

[0030] 10-winding core, 11-first diaphragm, 20-reference electrode, 21-conductive column, 211-first metal part, 212-second metal part, 213-third metal part, 2131-first bending part, 2132-second bending part, 2133-third bending part, 22-conductive sheet, 30-insulating tape. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present utility model.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description". Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. In order to enable any technician in the field to implement and use the utility model, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the utility model with unnecessary details. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0034] Figure 1 It is a three-dimensional schematic diagram of a winding core provided in an embodiment of the utility model; Figure 2 Schematic diagram of a reference electrode provided by an embodiment of the present invention. Figure 1 and Figure 2 The present application provides a battery cell detection structure, including: a winding core 10 and a reference electrode 20. The reference electrode 20 includes a conductive column 21 and a conductive sheet 22, and the conductive sheet 22 is coated on one end of the conductive column 21; wherein, one end of the conductive column 21 coated with the conductive sheet 22 extends into the winding core 10, and the end of the conductive column 21 away from the conductive sheet 22 is configured to be connected to the detection circuit outside the winding core 10.

[0035] The conductive sheet 22 is wound around the conductive column 21 at least once along the circumferential direction of the conductive column 21 , and the deviation of the winding thickness of the conductive sheet 22 at any position along the circumferential direction of the conductive column 21 relative to the set thickness is less than or equal to 5%.

[0036] In some embodiments, when the conductive pillar 21 is in the shape of a cylinder, the circumferential direction of the conductive pillar 21 is the circumferential direction of the cylinder. It is understandable that the conductive pillar 21 can also be in other shapes, such as a square cylinder, and the circumferential direction of the conductive pillar 21 is the direction in which the square cylinder sequentially surrounds its four sides.

[0037] In some embodiments, the set thickness is the product required thickness of the conductive sheet 22 wrapped around the conductive column 21 for at least one week, and the wrapping thickness is the actual thickness of the conductive sheet 22 wrapped around the conductive column 21 for at least one week. It should be noted that the set thickness can be adjusted according to actual needs, for example, according to the type of electrolyte, the magnitude of the detection current, etc., and this application does not make specific limitations here.

[0038] In some embodiments, in practice, the conductive sheet 22 is wound around the conductive column 21 for at least one circle to form a cylinder having a first surface and a second surface, the first surface is in contact with the conductive column 21, the second surface is away from the conductive column 21, and the distance between the first surface and the second surface is the winding thickness.

[0039] In some embodiments, the deviation of the winding thickness of the conductive sheet 22 relative to the set thickness is less than or equal to 5%, so that the thickness of the conductive sheet 22 at any location in the circumferential direction of the conductive column 21 can be uniform. For example, the deviation can be 1%, 2%, 3%, or 4%.

[0040] In some embodiments, Figure 3 This is a cross-sectional view of the battery cell, conductive column, conductive sheet and insulating tape provided by the embodiment of the utility model. Figures 1 to 3 , the winding core 10 includes a positive electrode, a negative electrode, a first separator 11 and a second separator. The first separator 11, the positive electrode, the second separator and the negative electrode are wound to form a cylindrical structure, wherein the first separator 11 and the second separator are pre-rolled at least one circle so that the conductive sheet 22 of the reference electrode extends between the first separator 11 and the second separator. The function of the provided separator is to separate the positive electrode and the negative electrode to prevent the positive electrode and the negative electrode from directly contacting each other and causing a short circuit. In some embodiments, the material of the positive electrode can be a derivative of lithium. The material of the negative electrode can be graphite. The material of the separator can be polyolefin or polyimide.

[0041] In some embodiments, the conductive sheet 22 may be rectangular in shape. Figure 1 This is only a schematic illustration of the shape of the conductive sheet 22 . In other embodiments, the shape of the conductive sheet 22 may be a triangle, a pentagon, or the like.

[0042] Specifically, the conductive sheet 22 extends between the first diaphragm 11 and the second diaphragm, which can effectively protect the reference electrode 20 from direct contact with the positive electrode and the negative electrode.

[0043] In some embodiments, a winding core 10 and a reference electrode 20 are provided, and one end of a conductive column 21 of the reference electrode 20 covered with a conductive sheet 22 extends into the interior of the winding core 10, and the end of the conductive column 21 away from the conductive sheet 22 is provided with a detection circuit connected to the outside of the winding core 10. Since the conductive sheet 22 is wound around the conductive column 21 for at least one circle along the circumferential direction of the conductive column 21, and the deviation of the winding thickness of the conductive sheet 22 relative to the set thickness is less than or equal to 5%, the thickness of the conductive sheet 22 at any point in the circumferential direction of the conductive column 21 is uniform, which can ensure the uniform current distribution on the surface of the reference electrode 20, thereby improving the accuracy of the reference electrode 20 in measuring the voltage of the winding core 10.

[0044] In some embodiments, Figure 4 is a three-dimensional schematic diagram of the conductive column, conductive sheet and insulating tape provided by the embodiment of the utility model, please refer to Figures 1 to 4 , the conductive column 21 is bonded to the conductive sheet 22 .

[0045] Compared with the prior art, the conductive pillars 21 need to be cleaned with an acid solution before depositing conductive material on the conductive pillars 21. However, the present application reduces the cleaning process of the conductive pillars 21 in an acid solution by bonding the conductive pillars 21 to the conductive sheet 22, thereby reducing the processing cost.

[0046] In one example, the bonding may be performed by using insulating adhesive tape 30. In another example, the bonding may be performed by using high temperature adhesive. Since the high temperature adhesive or insulating adhesive tape 30 has high temperature resistance, the high temperature adhesive or insulating adhesive tape 30 may improve the stability and reliability of the bonding.

[0047] Specifically, at least part of the conductive column 21 is adhered to the conductive sheet 22, and the adhesion area of ​​the conductive column 21 can be 1 / 5 to 1 / 2 of the area of ​​the conductive sheet 22, and the adhesion area of ​​the conductive sheet 22 can be 1 / 5 to 1 / 2 of its own area. Within this range, the conductive column 21 and the conductive sheet 22 can be tightly connected together.

[0048] In some embodiments, the winding core has a pre-rolled structure, which is formed by winding the first diaphragm and the second diaphragm, and at least part of the conductive pillar is attached to the first diaphragm and / or the second diaphragm. The attached area of ​​the conductive pillar 21 is 1 / 10 to 1 / 5 of its own area, the attached area of ​​the first diaphragm 11 is 1 / 10 to 1 / 5 of the area of ​​the conductive pillar 21, and the attached area of ​​the second diaphragm is 1 / 10 to 1 / 5 of the area of ​​the conductive pillar 21. Within this range, the conductive pillar 21, the first diaphragm 11 and the second diaphragm can be tightly connected together.

[0049] In some embodiments, see Figures 1 to 4, the conductive sheet 22 is cylindrical, the thickness of the conductive sheet 22 is 10-30 μm; and / or the length of the conductive sheet 22 is 0.1-0.2 times the length of the winding core 10; and / or the width of the conductive sheet 22 is 0.1-0.2 times the length of the winding core 10. For example, the thickness of the conductive sheet 22 can be 12 μm, 16 μm, 23 μm, 25 μm, or 27 μm.

[0050] In some embodiments, the thickness of the conductive sheet 22 is 10 to 30 μm, and such a thickness can ensure that the conductive sheet 22 has sufficient conductivity. The length of the conductive sheet 22 is 0.1 to 0.2 times the length of the core 10, and such a length can ensure that the conductive sheet 22 is in contact with the core 10, which is convenient for measuring the potential of the positive and negative electrodes, and then calculating the voltage of the battery cell. The width of the conductive sheet 22 is also 0.1 to 0.2 times the length of the core 10, and such a width can also ensure that the conductive sheet 22 is in contact with the core 10, which is convenient for measuring the potential of the positive and negative electrodes, and then calculating the voltage of the battery cell.

[0051] In some embodiments, the diameter of the conductive pillar 21 is 10-30 μm. For example, the diameter of the conductive pillar 21 may be 12 μm, 16 μm, 23 μm, 25 μm, or 27 μm.

[0052] In some embodiments, the diameter of the conductive pillar 21 is 10-30 μm, and the conductive pillar 21 within this range may be placed between the first diaphragm 11 and the second diaphragm.

[0053] In some embodiments, the conductive column 21 is one of copper wire, gold wire, silver wire and nickel wire. Copper wire, gold wire, silver wire and nickel wire have good electrical conductivity and can effectively transmit current. In addition, these metals also have good corrosion resistance and can work stably in the winding core 10 for a long time.

[0054] In some embodiments, the conductive sheet 22 is a lithium sheet. The lithium sheet is a flexible metal, which can be pressed during the manufacturing process, ensuring that the thickness of the lithium sheet is more uniform, thereby ensuring uniform current distribution on the surface of the reference electrode 20.

[0055] In some embodiments, Figure 5 This is a first stereoscopic schematic diagram of a conductive column provided by an embodiment of the utility model. Figures 1 to 5 The conductive column 21 has a first metal portion 211 and a second metal portion 212 . The conductive sheet 22 wraps the first metal portion 211 , and an insulating layer wraps the outer side of the second metal portion 212 .

[0056] In some embodiments, the first metal portion 211 and the second metal portion 212 are made of the same material. The first metal portion 211 and the second metal are both made of one of copper wire, gold wire, silver wire and nickel wire.

[0057] In some embodiments, the first metal part 211 and the conductive sheet 22 are conductive, and by placing them in the winding core 10, the positive and negative potentials in the battery cell can be measured. The second metal part 212 is wrapped with an insulating layer, which can effectively prevent the user from getting an electric shock, further ensuring personal safety.

[0058] In some embodiments, the conductive column 21 further includes a third metal portion 213, one end of the third metal portion 213 is connected to the second metal portion, and the other end of the third metal portion 213 is connected to the detection circuit. The third metal portion 213 and the first metal portion 211 are made of the same material. The third metal portion 213 is conductive and is connected to the detection circuit to display the positive and negative potential values ​​of the battery cell.

[0059] In some embodiments, the first metal part 211, the second metal part 212 and the third metal part 213 are all wrapped with an insulating layer; then, the first metal part 211 and a partial area of ​​the insulating layer are flattened or squeezed to expose at least a portion of the first metal part 211, so that the first metal part 211 is in contact with the conductive sheet 22, thereby measuring the positive electrode potential and the negative electrode potential; finally, the third metal part 213 and a partial area of ​​the insulating layer are flattened or squeezed to expose at least a portion of the third metal part 213, so that the third metal part 213 is in contact with the detection circuit, thereby displaying the values ​​of the positive electrode potential and the negative electrode potential.

[0060] In some embodiments, the material of the insulating layer may be phenolic, polyurethane, acrylate, polyimide, or the like.

[0061] In some embodiments, the first metal part 211 , the second metal part 212 and the second metal part 212 are all wrapped with an insulating layer, and this structure can also be referred to as an enameled first metal part 211 , an enameled second metal part 212 and an enameled second metal part 212 .

[0062] In some embodiments, see Figures 1 to 5 , the thickness of the first metal portion 211 is smaller than the thickness of the second metal portion 212 ; and / or the width of the first metal portion 211 is larger than the width of the second metal portion 212 .

[0063] In some embodiments, the first metal part 211 and the second metal part 212 are cylinders. By flattening or squeezing a portion of the first metal part 211 and the insulating layer, the thickness of the first metal part 211 is smaller than the thickness of the second metal part 212, and the width of the first metal part 211 is greater than the width of the second metal part 212.

[0064] Specifically, the thickness of the first metal portion 211 gradually decreases and the width gradually increases in a direction close to the conductive sheet 22 . The thickness of the third metal portion 213 gradually decreases and the width gradually increases in a direction away from the conductive sheet 22 .

[0065] In some embodiments, one end of the conductive pillar 21 away from the conductive sheet 22 is encapsulated with an aluminum-plastic film.

[0066] Specifically, Figure 6 It is a first stereoscopic schematic diagram of a battery cell and a conductive column provided by an embodiment of the utility model; Figure 7 This is a second stereoscopic schematic diagram of the battery cell and the conductive column provided by the embodiment of the utility model. Figure 6 and Figure 7 The third metal part 213 has a first bending part 2131, a second bending part 2132 and a third bending part 2133. The first bending part 2131 is arranged outside the winding core 10 so that the winding core 10 is perpendicular to the first bending part 2131. One end of the second bending part 2132 is connected to the first bending part 2131, and the second bending part 2132 is perpendicular to the first bending part 2131. One end of the third bending part 2133 is connected to the other end of the second bending part 2132, and the third bending part 2133 is perpendicular to the second bending part 2132, and the third bending part 2133 is perpendicular to the first bending part 2131. By arranging the first bending part 2131, the second bending part 2132 and the third bending part 2133, the direction of the conductive column 21 can be changed, making it more convenient for aluminum-plastic film packaging.

[0067] Figure 8 It is a voltage diagram of a battery cell provided by an embodiment of the present utility model. For example, by measuring the positive electrode potential and the negative electrode potential, the voltage of the battery cell is calculated.

[0068] Furthermore, in order to better implement the battery cell detection structure in the embodiment of the present application, on the basis of the battery cell detection structure, the present application also provides a battery, and the battery includes the above-mentioned battery cell detection structure. The present application sets and reference electrode, and one end of the conductive column of the reference electrode is coated with a conductive sheet and extends into the interior of the winding core, and the end of the conductive column away from the conductive sheet is configured with a detection circuit connected to the outside of the winding core. Since the conductive sheet is wound around the conductive column for at least one circle along the circumferential direction of the conductive column, and the deviation of the winding thickness of the conductive sheet from the set thickness is less than or equal to 5%, the thickness of the conductive sheet at any point in the circumferential direction of the conductive column is uniform, which can ensure the uniformity of the current distribution on the surface of the reference electrode, thereby improving the accuracy of the reference electrode in measuring the winding core voltage.

[0069] In some embodiments, the battery further comprises a tab, which is disposed on the winding core and connected to the reference electrode by welding.

[0070] In some embodiments, the battery is a lithium-ion battery system, which includes at least one of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, high nickel ternary and lithium iron phosphate.

[0071] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0072] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0073] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0074] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0075] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0076] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the descriptions, definitions, and / or use of terms in the accompanying materials of this application are inconsistent or conflicting with the content described in this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

[0077] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery cell detection structure, characterized in that: include: Roll core (10); A reference electrode (20), the reference electrode (20) comprising a conductive column (21) and a conductive sheet (22), the conductive sheet (22) being coated on one end of the conductive column (21); One end of the conductive column (21) covered with the conductive sheet (22) extends into the interior of the winding core (10), and one end of the conductive column (21) away from the conductive sheet (22) is configured to be connected to a detection circuit outside the winding core (10); The conductive sheet (22) is wound around the conductive column (21) at least once along the circumferential direction of the conductive column (21), and the deviation of the winding thickness of the conductive sheet (22) at any point along the circumferential direction of the conductive column (21) relative to the set thickness is less than or equal to 5%.

2. The battery cell detection structure according to claim 1, characterized in that: The conductive column (21) is bonded to the conductive sheet (22).

3. The battery cell detection structure according to claim 2, characterized in that: The thickness of the conductive sheet (22) is 10 to 30 μm; and / or The length of the conductive sheet (22) is 0.1 to 0.2 times the length of the winding core (10); and / or The width of the conductive sheet (22) is 0.1 to 0.2 times the length of the winding core (10).

4. The battery cell detection structure according to claim 2, characterized in that: The winding core (10) has a pre-rolled structure, which is formed by winding a first diaphragm (11) and a second diaphragm, and at least part of the conductive column (21) is adhered to the first diaphragm (11) and / or the second diaphragm.

5. The battery cell detection structure according to claim 4, characterized in that: The bonding area of ​​the conductive column (21) is 1 / 10 to 1 / 5 of its own area, the bonding area of ​​the first diaphragm (11) is 1 / 10 to 1 / 5 of the area of ​​the conductive column (21), and the bonding area of ​​the second diaphragm is 1 / 10 to 1 / 5 of the area of ​​the conductive column (21).

6. The battery cell detection structure according to claim 1, characterized in that: The conductive column (21) is a cylindrical column, and the diameter of the conductive column (21) is 10 to 30 μm.

7. The battery cell detection structure according to claim 1, characterized in that: The conductive column (21) is one of a copper wire, a gold wire, a silver wire and a nickel wire; and / or The conductive sheet (22) is a lithium sheet.

8. The battery cell detection structure according to any one of claims 1 to 7, characterized in that: The conductive column (21) has a first metal portion (211) and a second metal portion (212). The conductive sheet (22) wraps the first metal part (211), and the outer side of the second metal part (212) is wrapped with an insulating layer.

9. The battery cell detection structure according to claim 8, characterized in that: The thickness of the first metal part (211) is smaller than the thickness of the second metal part (212); and / or The width of the first metal part (211) is greater than the width of the second metal part (212).

10. The battery cell detection structure according to claim 8, characterized in that: The conductive column (21) further comprises a third metal part (213), one end of the third metal part (213) is connected to the second metal part (212), and the other end of the third metal part (213) is connected to a detection circuit.

11. The battery cell detection structure according to claim 10, characterized in that: The third metal part comprises a first bending part (2131), a second bending part (2132) and a third bending part (2133) which are connected in sequence, the first bending part (2131) being perpendicular to the winding core (10), the second bending part (2132) being perpendicular to the first bending part (2131), the third bending part (2133) being perpendicular to the first bending part (2131), and the third bending part (2133) being perpendicular to the second bending part (2132).

12. The battery cell detection structure according to any one of claims 1 to 7, characterized in that: One end of the conductive column (21) away from the conductive sheet (22) is packaged with an aluminum-plastic film.

13. A battery, characterized in that: The battery comprises a cell detection structure as described in any one of claims 1 to 12 above.

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