Battery cell pole piece, pole piece film roll, winding type battery cell, battery and precise winding system

Abstract

The utility model relates to the technical field of lithium battery production, in particular to a battery cell pole piece, which is characterized by comprising a tab area, a film coating area and a first mark which is arranged between the tab area and the film coating area and extends along the length direction of the pole piece, and the first mark is used for recording the length information of the pole piece. The utility model also relates to a battery cell pole piece film roll formed by winding the battery cell pole piece, the outer surface of the battery cell pole piece film roll comprises a second identifier, and the second identifier is used for recording parameter data of the pole piece. The utility model further relates to a winding type battery cell, a battery and an accurate winding system.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery production technical field especially relates to a kind of battery pole piece, pole piece film roll, winding type battery pole piece, battery and precision winding system. BACKGROUND

[0002] At present, the battery pole piece, the diaphragm and the like are included in the structure of battery pole piece, and the battery pole piece is usually cut by the process of multiple sections, and the data of the pole piece after winding, such as the area density, the thickness, the pole piece film width and the like, can only be matched with the data of the film roll of the first section by matching the film roll number on the winding equipment with the film roll number of the pole piece section, so as to realize the matching of the pole piece after cutting and the film roll of the winding battery pole piece.

[0003] However, the winding mode caused by the sectional cutting leads to the inconsistency of the pole piece data, and the battery pole piece after winding cannot be accurately positioned in the position of the film roll, and the accurate area density, thickness, coating film width and other pole piece characteristic data of the battery pole piece after winding cannot be obtained, that is, the single battery pole piece cannot be accurately predicted by the characteristic data in the process. Since the battery pole piece after winding cannot be accurately positioned in the position of the film roll, when the battery pole piece fails in the subsequent test, the accurate data of the area density, thickness, film width and the like of the single battery pole piece cannot be accurately obtained, so that the accurate analysis of the failure reason of the battery pole piece cannot be carried out. SUMMARY

[0004] The utility model aims at providing a kind of battery pole piece film roll, and the utility model is identified to the battery pole piece film roll of one section, and the data of battery pole piece after winding can be accurately collected by identifying the mark in the winding process.

[0005] In the first aspect, the embodiment of the utility model discloses a kind of battery pole piece, and the battery pole piece includes:

[0006] The first mark is arranged between the tab area and the coating film area and extends along the length direction of the pole piece, and the first mark is used to record the length information of the pole piece.

[0007] Preferably, the first mark includes a scale and / or a two-dimensional code.

[0008] In the second aspect, the embodiment of the utility model discloses a kind of battery pole piece film roll wound by the above-mentioned battery pole piece, and the outer surface of the battery pole piece film roll includes a second mark, and the second mark is used to record the parameter data of the pole piece.

[0009] Optionally, the parameter data includes battery code, collection time, positive pole piece film roll number, negative pole piece film roll number, upper diaphragm, lower diaphragm, winding needle number, positive pole piece length and negative pole piece length.

[0010] Optionally, the second identifier comprises a bar code and / or a two-dimensional code.

[0011] In a third aspect, the embodiments of the utility model discloses a winding type electric core, the winding type electric core includes positive sheet, negative sheet and diaphragm, the positive sheet and the negative sheet are spaced through the diaphragm, and layer by layer winding forms the winding type electric core.

[0012] In a fourth aspect, the embodiments of the utility model further discloses a battery, the battery includes the winding type electric core and shell above-mentioned, and the shell wraps the winding type electric core and forms the sealed body.

[0013] In a fifth aspect, the embodiments of the utility model further discloses a precise winding system for the above-mentioned electric core sheet film roll, including positive sheet feeding position, negative sheet feeding position, setting the code scanning gun at the positive sheet feeding position and the negative sheet feeding position for scanning the first identifier and / or the second identifier, and winding the positive sheet, the negative sheet and the diaphragm simultaneously.

[0014] Optionally, the first identifier comprises a scale and / or a two-dimensional code, and the second identifier is used for recording parameter data of the sheet.

[0015] Optionally, the parameter data comprises an electric core code, a collection time, a positive sheet film roll number, a negative sheet film roll number, an upper diaphragm, a lower diaphragm, a winding needle number, a positive sheet length and a negative sheet length.

[0016] Compared with the prior art, the utility model discloses the difference technical features in that the collectable code is set on the film roll, the data identifier is carried out to the first section film roll, the data identifier is identified when winding, and the electric core sheet data is collected.

[0017] The utility model discloses the effect compared with prior art is as follows: the specific position of the electric core sheet in coating, roll pressing and slitting film roll can be accurately positioned, through accurate positioning, the accurate data such as the surface density of the electric core sheet, the sheet thickness, the coating width are obtained, so that the single electric core capacity accurate prediction can be obtained, the data of winding electric core sheet can be accurately collected, the precise data for the performance failure analysis of subsequent single electric core is provided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of an electric core sheet according to an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of an electric core sheet film roll according to an embodiment of the utility model;

[0020] Figure 3 is a system schematic diagram of winding of an electrode sheet of an electric core according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] The present application will be further described below in conjunction with specific embodiments and drawings. It can be understood that the specific embodiments described herein are only for the purpose of explaining the present application, and not limiting the present application. In addition, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures or processes. It should be noted that in the present specification, similar reference numerals and letters represent similar items in the following drawings.

[0022] It should be understood that although the terms "first", "second", and the like can be used herein to describe various features, these features should not be limited by these terms. These terms are used only for the purpose of distinguishing between similar features and cannot be understood as indicating or implying relative importance. For example, a first feature can be referred to as a second feature, and similarly a second feature can be referred to as a first feature, without departing from the scope of the example embodiments.

[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0024] The electric core test is an important link in the production process of the battery, and through the analysis of the performance and reliability of the battery, the expected performance and life of the battery can be ensured. The electric core test mainly includes capacity test, internal resistance test, charge and discharge test, cycle life test, and the test is mainly related to the parameters of the battery electrode sheet, and the parameters involve area density, film width, compactness and electrode sheet thickness. These parameters will affect the internal resistance and capacity of the battery, thereby affecting the performance of the battery.

[0025] At present, the actual capacity of a single electric core is calculated by formula, for example, the positive electrode capacity of the electric core is calculated by multiplying the positive electrode sheet coating area, the positive electrode sheet area density, the positive electrode main powder mass ratio and the positive electrode main material gram. Since the electrode sheet of the wound electric core cannot be accurately matched with the coating, rolling and slitting film roll electrode sheet data, only the electric core electrode sheet film roll number and the average value of the corresponding data can be obtained by scanning the code, resulting in an error in the electric core capacity calculated by the formula.

[0026] The present application provides an electric core electrode sheet film roll, which can accurately position the specific position of the electric core electrode sheet in the coating, rolling and slitting electric core electrode sheet film roll. Through accurate positioning, the area density, electrode sheet thickness and coating width of the electric core electrode sheet are obtained, so as to accurately predict the capacity of a single electric core.

[0027] Figure 1It is a schematic diagram of a battery cell pole piece according to the embodiment of the utility model.

[0028] As shown in the utility model discloses a battery cell pole piece needs the cooperation of tab area 1, coating film area 2 and first mark 3. Figure 1

[0029] The assembly of the winding type battery is the process of assembling the positive pole piece, the negative pole piece, the diaphragm, the tab, the shell and other components into the battery, and the assembly process includes winding, assembling, welding and other procedures.

[0030] As an embodiment, the utility model discloses a battery cell pole piece includes tab area 1 and coating film area 2, and the first mark 3 that sets up between tab area 1 and coating film area 2, extends in the length direction of pole piece, and the first mark 3 is used to record the length information of pole piece.

[0031] As an embodiment, the first mark 3 includes a scale and / or a two-dimensional code.

[0032] The first mark 3 can include pole piece product model, batch film roll number, film roll detection meter number, target value, base material weight, target upper limit, target lower limit, process difference and weight average.

[0033] The tab 1 is welded on the current collector of the pole piece, and the non-coating film area between the tab and the coating film area 2 is sprayed with mark code recording the length information of the pole piece.

[0034] ​The existing battery cell only has the data of the film roll number and the diaphragm number, and does not have the data of the pole piece, and the scheme can accurately locate the data of different pole pieces, and only needs to be scanned to obtain the thickness, surface density and width data of a section of the pole piece. For example, for the battery cell code CODE, the existing film roll can obtain that the positive electrode film roll number corresponding to the winding machine numbers 1, 2 and 3 is D1, the negative electrode film roll number is D3, the upper diaphragm is E1, and the lower diaphragm is E3. The scheme of the utility model can further obtain the data of the pole piece, for example, for the battery cell code CODE, the lengths of the positive pole pieces corresponding to the winding machine numbers 1, 2 and 3 are L1, L2 and L3 respectively, and the lengths of the negative pole pieces are L4, L5 and L6. It can be understood that the above-mentioned numbers and data are only for convenient explanation, and do not limit the actual numbers and data.

[0035] It is worth noting that although the tab of the present application is in the form of a full tab, only as a special example of an embodiment of the present application, the scheme of the present application can also be used for single tab and multi-tab, and the non-coated film area of the single tab and the multi-tab can be provided with the first mark 3.

[0036] Figure 2 It is a schematic diagram of a battery cell pole piece film roll according to an embodiment of the utility model.

[0037] By identifying the Figure 1 The battery cell pole piece is wound and re-identified as shown in Figure 2 The battery cell pole piece film roll 5 is obtained as shown in

[0038] As an embodiment, the utility model also discloses a battery cell pole piece film roll 5 formed by winding the above-mentioned battery cell pole piece, and the outer surface of the battery cell pole piece film roll 5 comprises a second mark 6, and the second mark 6 is used for recording the parameter data of the pole piece. The parameter data can include the information of the battery cell code, the collection time, the positive pole piece film roll number, the negative pole piece film roll number, the upper diaphragm, the lower diaphragm, the winding needle number, the positive pole piece length and the negative pole piece length.

[0039] As an embodiment, the second mark 6 can include a bar code and / or a two-dimensional code.

[0040] The battery cell pole piece generates the battery cell pole piece film roll 5 after the winding process, and the film roll 5 is transferred to the winding and cutting process. Before feeding, the information of the second mark 6 is obtained by the corresponding code scanning gun, for example, the film roll number information is stored to the winding and cutting equipment, and the corresponding batch film roll number is recorded to the data table.

[0041] Referring to Figure 3It is a system schematic diagram of winding of the electrode sheet of the battery cell according to the embodiment of the utility model. The code scanning gun is arranged at the feeding position of the positive sheet and the negative sheet, and the data is continuously recorded, the positive sheet, the negative sheet and the separator are wound at the same time, and the electrode sheet film roll 5 is generated, for example, the product model in the continuously recorded data is AA, the film roll number is BB, the film roll detection meter number record includes a, b, c and other meter number segments, the target value is D, the base material weight is W, the target upper limit and the target lower limit are H / L, and the process tolerance is C. The scheme also records that the weight average corresponding to the film roll meter number segments a, b and c is W1, W2 and W3 respectively. It can be understood that the above numbering and data are only for convenient explanation, and the actual numbering and data are not limited.

[0042] The utility model discloses a kind of winding type battery cells, winding type battery cells include positive sheet, negative sheet and separator, positive sheet, negative sheet and separator are located in the coating film area 2 of battery cell electrode sheet, positive sheet and negative sheet are spaced by separator, and winding is formed into winding type battery cell layer by layer.

[0043] The utility model discloses a kind of batteries, battery includes the winding type battery cell and shell of above, shell is wrapped winding type battery cell and forms sealed body.

[0044] The implementation of winding type battery cell and battery of the utility model corresponds with the implementation of above-mentioned electrode sheet and electrode sheet film roll, and will not be repeated here.

[0045] Compared with prior art, the scheme of the utility model sets up the code that can be collected on film roll, carries out data identification to first section film roll, identifies data identification when winding, collects battery cell electrode sheet data, can accurately collect electrode sheet information, calculates the capacity of single battery, for example, as described above, according to position information, the accurate position of battery cell electrode sheet in film roll is obtained, accurate electrode sheet coating area, electrode sheet density and other parameters are obtained, and then according to formula:

[0046] Battery cell positive capacity=positive sheet coating area*positive sheet surface density*positive main material quality ratio*positive main material gram

[0047] The capacity of single battery cell is calculated, and then the capacity of single battery is obtained.

[0048] Illustrative embodiments of the utility model include but are not limited to a winding battery cell film roll and winding battery cell.

[0049] Various aspects of the illustrative embodiments will be described using terminology commonly employed by those skilled in the art and having a basic understanding of the technology. It will be apparent, however, to one skilled in the art that the features described in the specification can be implemented in a variety of alternative embodiments. For purposes of explanation and illustration, specific numbers and configurations are set forth in order to provide a thorough understanding. It is however apparent to those skilled in the art that the alternative embodiments can be practiced without the specific details. In some instances, well-known features are omitted or simplified in order not to obscure the illustrative embodiments being presented.

[0050] Furthermore, various operations will be described as multiple discrete operations, in a manner that is most helpful in understanding the illustrative embodiments; however, the order of description should not be construed as to imply that these operations are necessarily order dependent. Many of the operations can be handled in parallel or concurrently. Additionally, the description neither implies that the various blocks are the only ones that can be employed nor that all of the blocks must be employed. Skilled artisans will recognize that the various illustrative embodiments can include additional blocks not shown in the figures, and / or can omit, combine or consolidate some of the illustrated blocks. The description is also not intended to imply detailed or complex logic. The description is also not intended to imply that the operations will be implemented in the order shown in the figures.

[0051] Reference throughout this specification to "an example," "one example," "exemplary" or "one embodiment" means that a particular feature, structure, or characteristic described in connection with the example is included in at least one embodiment. The appearances of the phrase "in one example" in various places in the specification are not necessarily all referring to the same example, nor are separate or alternative embodiments mutually exclusive of other embodiments. Moreover, various features are described which can be exhibited by any of the embodiments and each of the features can be combined with any of the other features in each of the

[0052] The terms "comprises", "comprising", "includes", "including", "has", "having" and "contains", "containing" are synonymous and are used inclusively, in an open-ended fashion, and do not exclude additional, unrecited elements.

[0053] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to avoid obscuring the understanding of this description.

[0054] Similarly, it is to be understood that the embodiments of the present application can alternately be phrased or described substantially similarly to what is described herein, without departing from the scope of the application. Moreover, it is to be understood that, for brevity and clarity, the descriptions herein have focused on the exemplary embodiments of the application and that of other alternatives are available. Additionally, it is to be understood that no limitations with respect to the

[0055] Those skilled in the art can appreciate that modules in the apparatus of the embodiments can be adapted and placed in one or more apparatuses other than the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and furthermore can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, all combinations of all features disclosed in this specification (including the accompanying claims, abstract and drawings) and all processes or units of any methods or apparatuses so disclosed can be adopted in any combination. Unless explicitly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can be replaced by alternative features providing the same, equivalent or similar functionality.

[0056] Furthermore, those skilled in the art will appreciate that a combination of features of different embodiments can mean that the combination is within the scope of the application and forms a different embodiment. For example, in the claims, any of the claimed embodiments can be used in any combination.

Claims

1. An electrode tab of a battery cell, characterized by, The first mark is arranged between the tab area and the coating film area and extends along the length direction of the electrode sheet, and is used for recording length information of the electrode sheet. The first mark comprises a scale and / or a two-dimensional code.

2. The electrode sheet of the battery cell according to claim 1, characterized by, An outer surface of the electrode sheet film roll comprises a second mark used for recording parameter data of the electrode sheet.

3. An electrode sheet film roll formed by winding the electrode sheet of claim 1, characterized by The parameter data comprises a cell code, a collection time, a positive electrode sheet film roll number, a negative electrode sheet film roll number, an upper separator, a lower separator, a roll needle number, a positive electrode sheet length, and a negative electrode sheet length.

4. The electrochemical cell electrode sheet film roll of claim 3, wherein, The second mark comprises a bar code and / or a two-dimensional code.

5. The cell tab film roll of claim 4, wherein, The winding type cell comprises a positive electrode sheet, a negative electrode sheet, and a separator, the positive electrode sheet and the negative electrode sheet are separated by the separator, and are wound layer by layer to form the winding type cell.

6. A wound cell, characterized by, The winding type cell comprises the winding type cell of claim 6 and a shell, and the shell wraps the winding type cell to form a sealed body.

7. A battery, characterized by 8. A precise winding system for the electrode sheet film roll of any one of claims 3-5, comprising a positive electrode sheet feeding position and a negative electrode sheet feeding position, wherein a code scanning gun is arranged at the positive electrode sheet feeding position and the negative electrode sheet feeding position to scan the first mark and / or the second mark; and the positive electrode sheet, the negative electrode sheet, and the separator are wound simultaneously. The first mark comprises a scale and / or a two-dimensional code, and the second mark is used for recording parameter data of the electrode sheet. The parameter data comprises a cell code, a collection time, a positive electrode sheet film roll number, a negative electrode sheet film roll number, an upper separator, a lower separator, a roll needle number, a positive electrode sheet length, and a negative electrode sheet length. ​ 9. The system of claim 8, wherein, ​ 10. The system of claim 9, wherein, ​

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