Battery cell winding method and battery cell winding device

Abstract

The invention relates to the technical field of battery processing, and discloses a battery cell winding method and a battery cell winding device. The battery cell winding method comprises the following steps: winding a positive plate, a negative plate and a diaphragm to form a battery cell; obtaining a tab dislocation parameter, and judging whether the tab dislocation parameter is in a preset dislocation interval or not; if not in the preset dislocation interval, judging that the product is an unqualified product, and directly discharging waste; in the preset dislocation interval, if the dislocation parameter of the tab is in the non-deviation-correction range, the next process is carried out without rubbing after the identification piece is normally attached to the outer side of the battery cell; and if the tab dislocation parameter is within the deviation correction range, an identification piece is attached to the outer side of the battery cell, and deviation exists between the identification piece and the preset position, the battery cell is rubbed, so that the tab and the identification piece are both located at the preset position. According to the battery cell winding method and the battery cell winding device, it can be guaranteed that the tab and the identification piece after winding are both in the aligned state, the rejection rate of the battery cell is reduced, and meanwhile code scanning is easier.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing, and in particular to a battery cell winding method and a battery cell winding device. Background Art

[0002] When winding the battery cells of square shell batteries or cylindrical batteries, after the positive and negative electrodes and separators are rewound, the winding process of the first battery cell will fluctuate in thickness, resulting in poor alignment of the tabs. In severe cases, the battery cell will be scrapped, increasing costs. Manual adjustment has a lag and cannot completely solve the above problems. In addition, identification parts are generally required to be attached to the battery cell to display relevant information about the battery cell. When the tab alignment is not good, if the identification part is directly applied to the preset position, the position of the identification part will shift from the preset position after the tab is misaligned and reshaped, which is not convenient for subsequent code scanning and requires manual code change, which is time-consuming and labor-intensive.

[0003] Therefore, there is an urgent need for a battery cell winding method and a battery cell winding device to solve the above problems. Summary of the invention

[0004] Based on the above, the object of the present invention is to provide a battery cell winding method and a battery cell winding device, which can ensure that the electrode ears and identification pieces after winding are in an aligned state, reduce the battery cell scrap rate, and make code scanning easier.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A cell winding method, comprising the steps of:

[0007] Winding the positive electrode sheet, the negative electrode sheet and the separator to form a battery cell;

[0008] Obtaining a tab misalignment parameter, and determining whether the tab misalignment parameter is within a preset misalignment interval;

[0009] If the product is not in the preset misalignment range, it is judged as unqualified and directly discarded;

[0010] In the preset misalignment interval, if the misalignment parameter of the pole tab is within the non-correction range, the identification piece is normally attached to the outside of the battery cell without rubbing, and the next process is entered; if the misalignment parameter of the pole tab is within the correction range, the identification piece is attached to the outside of the battery cell, and there is an offset between the identification piece and the preset position, the battery cell is rubbed so that the pole tab and the identification piece are both located at the preset positions.

[0011] A battery cell winding device can adopt the battery cell winding method as described in any of the above schemes to wind the battery cell, and the battery cell winding device includes: a winding needle, a tail pressure roller, a pole tab misalignment detection device, and a glue sticking roller; the winding needle is used to wind the positive electrode sheet, the negative electrode sheet and the separator; the tail pressure roller can move closer to or away from the winding needle; the pole tab misalignment detection device is used to detect and obtain the pole tab misalignment parameters; the glue sticking roller can move in two directions perpendicular to the axis of the winding needle to attach the identification piece to a preset position or to attach the identification piece to a position offset from the preset position.

[0012] The beneficial effects of the present invention are:

[0013] The present invention further obtains the tab misalignment parameters after the positive electrode sheet, the negative electrode sheet and the diaphragm are wound to form the battery cell, and determines whether the tab misalignment parameters are located in a preset misalignment interval to determine whether the battery cell needs to be further processed. When the tab misalignment parameters are located in the preset misalignment interval, it proves that the tab misalignment can be corrected by rubbing. Furthermore, before rubbing the battery cell, it is necessary to attach an identification piece to the outside of the battery cell, that is, rubbing the battery cell can not only correct the problem of poor tab alignment, but also adjust the position of the identification piece, so that the tab and the identification piece of the battery cell are located at the preset position after rubbing, and the tab placed at the preset position has a higher degree of alignment, and the position of the identification piece relative to the tab is fixed, which is convenient for subsequent code scanning operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0015] Figure 1 is a flow chart of a battery cell winding method provided in a specific embodiment of the present invention;

[0016] Figure 2 is a schematic diagram of a battery cell winding device provided in a specific embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of a qualified battery cell;

[0018] Figure 4 This is a schematic diagram of the positive misalignment of the battery cell's tab;

[0019] Figure 5 This is a schematic diagram of the negative misalignment of the battery cell's tab.

[0020] In the figure:

[0021] 10. Positive electrode sheet; 20. Negative electrode sheet; 30. Separator; 40. Cell; 50. Tab; 60. Identification piece;

[0022] 100, winding needle; 200, finishing pressure roller; 300, tab width sensor; 400, winding needle angle encoder; 500, rubber-applying roller. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "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 invention 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0025] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] like Figure 1 As shown, the present embodiment provides a battery cell winding method, the steps of which include winding a positive electrode sheet 10, a negative electrode sheet 20 and a separator 30 to form a battery cell 40; obtaining a tab misalignment parameter, and determining whether the tab misalignment parameter is within a preset misalignment interval; if it is not within the preset misalignment interval, it is determined to be a defective product and directly discharged as waste; within the preset misalignment interval, if the tab misalignment parameter is within a non-correction range, the identification piece 60 is normally attached to the outside of the battery cell 40 without rubbing, and the next process is entered; if the tab misalignment parameter is within the correction range, the identification piece 60 is attached to the outside of the battery cell 40, and there is an offset between the identification piece 60 and the preset position, then the battery cell 40 is rubbed so that the tab 50 and the identification piece 60 are both located at the preset positions.

[0029] After the positive electrode sheet 10, the negative electrode sheet 20 and the separator 30 are wound to form the battery cell 40, the tab misalignment parameter is further obtained, and by judging whether the tab misalignment parameter is in the preset misalignment interval, it is determined whether the battery cell 40 needs to be further processed. When the tab misalignment parameter is not in the preset misalignment interval, the battery cell 40 is directly judged as a defective product and is scrapped. When the tab misalignment parameter is in the preset misalignment interval and further in the non-correction range, the identification part 60 can be directly attached normally to the outside of the battery cell 40 without rubbing, and the next process can be entered; if the tab misalignment parameter is in the correction range, it proves that the misalignment of the tab 50 can be corrected by rubbing. Furthermore, before rubbing the battery cell 40, it is necessary to attach an identification piece 60 to the outside of the battery cell 40, and there is an offset between the identification piece 60 and the preset position. Then, rubbing the battery cell 40, that is, rubbing the battery cell 40 can not only correct the problem of poor alignment of the pole ear 50, but also adjust the position of the identification piece 60, so that after rubbing, the pole ear 50 and the identification piece 60 of the battery cell 40 are both located at the preset position, the alignment of the pole ear 50 placed at the preset position is higher, and the position of the identification piece 60 relative to the pole ear 50 is fixed, which is convenient for subsequent code scanning operations.

[0030] It can be understood that when the misalignment parameter of the pole ear is less than the preset misalignment interval, and further within the non-correction range, it means that the alignment of the pole ear 50 meets the product requirements, and the subsequent kneading operation can be omitted, and the identification piece 60 can be directly attached normally to the outside of the battery cell 40, and the completed product is a qualified product; when the misalignment parameter of the pole ear is greater than the preset misalignment interval, it means that the alignment of the pole ear 50 is too poor and cannot be corrected by kneading, and the battery cell 40 can be identified as an unqualified product. Exemplarily, the preset misalignment interval range is 0-30mm, and the correction range is 5mm-30mm, that is, when the misalignment parameter of the pole ear is between 0-5mm, the subsequent kneading operation can be omitted, and the identification piece 60 can be directly attached normally to the outside of the battery cell 40; when the misalignment parameter of the pole ear is between 5mm-30mm, it is necessary to attach the identification piece 60 with an offset between the preset position, and then perform the kneading operation; when the misalignment parameter of the pole ear is greater than 30mm, there is no need to attach the identification piece 60, and the battery cell 40 will be scrapped.

[0031] Optionally, the identification element 60 may be a two-dimensional code, an identification code, a characteristic code, etc. The problem of poor alignment of the tabs 50 of the battery cell 40 wound by the battery cell winding method is reduced by 0.2%, which effectively reduces waste and thus reduces costs.

[0032] like Figure 2 As shown, this embodiment also provides a battery cell winding device, which can use the battery cell winding method of any of the above schemes to wind the battery cell 40, and the battery cell winding device includes: a winding needle 100, a tail pressure roller 200, a tab misalignment detection device, and a glue sticking roller 500. Among them, the winding needle 100 is used to wind the positive electrode sheet 10, the negative electrode sheet 20 and the separator 30. The tab misalignment detection device is used to detect and obtain the tab misalignment parameters. The tail pressure roller 200 can move close to or away from the winding needle 100, and when the tail pressure roller 200 is close to the winding needle 100, it can be used to press the battery cell 40 for kneading operation.

[0033] Specifically, the tab misalignment detection device includes a tab width sensor 300 and a winding needle angle encoder 400. The tab width sensor 300 is used to detect the width between adjacent tabs 50 of the positive electrode sheet 10 and the negative electrode sheet 20. Two tab width sensors 300 are provided, and the two tab width sensors 300 are used to detect the width between adjacent tabs 50 of the positive tab 50 and the negative tab 50, respectively. The winding needle angle encoder 400 is used to detect the rotation angle of the winding needle 100. The corresponding parameters are obtained by the tab width sensor 300 and the winding needle angle encoder 400, and the tab misalignment parameters are calculated and obtained by referring to the prior art, which will not be repeated here.

[0034] It is worth noting that the adhesive roller 500 can move in two directions perpendicular to the axis of the winding needle 100 to attach the identification member 60 to a preset position or to attach the identification member 60 to a position offset from the preset position. Optionally, the movement in one direction is used to approach or move away from the winding needle 100 to attach the identification member 60, and the movement in the other direction is used to compensate for the offset between the identification member 60 and the preset position, so that when the tab misalignment parameter is within the correction range, the identification member 60 is attached to a position offset from the preset position. Optionally, the two directions perpendicular to the axis of the winding needle 100 are also arranged vertically.

[0035] Furthermore, the battery cell winding device is also provided with a control system, and each execution element and detection element are communicatively connected with the control system. The control system stores an execution program of the above-mentioned battery cell winding method. When the above-mentioned execution program is executed, the battery cell 40 winding operation can be performed accordingly.

[0036] Specifically, kneading the battery cell 40 includes: pressing the tail pressure roller 200 against the battery cell 40 with a preset pressure, and driving the battery cell 40 to rotate in a preset direction and at a preset angle. It is worth noting that the above-mentioned preset pressure is related to the parameters of the battery cell 40 itself, the preset direction can be clockwise or counterclockwise, and the preset direction and the preset angle are both related to the tab misalignment parameters. Optionally, the tail pressure roller 200 is set as a rubber roller, which is beneficial to protect the tail of the battery cell 40 from wrinkling due to greater pressure. Exemplarily, the preset pressure is set to 0.1Mpa-0.45Mpa.

[0037] It is worth noting that the above-mentioned kneading operation drives the finishing pressure roller 200 to press the battery cell 40 on the winding needle 100, and at the same time the winding needle 100 rotates to achieve the purpose of adjusting the alignment of the pole ear 50; essentially, it increases / decreases the gap between the outer ring electrode layers of the battery cell 40 to move the position of the pole ear 50 on the winding needle 100.

[0038] In this embodiment, when the tab misalignment parameter is within the correction range, before attaching the identification member 60, the following steps are further included: obtaining the attachment misalignment parameter of the identification member 60, illustratively, the attachment misalignment parameter includes the misalignment direction and misalignment distance between the identification member 60 and the tab 50; and attaching the identification member 60 according to the attachment misalignment parameter of the identification member 60. It can be understood that rubbing will also affect the position of the identification member 60, so before rubbing, the attachment position of the identification member 60 is not the preset position, but is offset by a certain distance relative to the preset position, that is, the misalignment direction and misalignment distance between the identification member 60 and the tab 50. By setting the above-mentioned misalignment direction and misalignment distance, the identification member 60 can be placed in the preset position after the rubbing operation.

[0039] Specifically, attaching the identification member 60 according to the attachment misalignment parameter includes moving the identification member 60 along the misalignment direction by the misalignment distance, and then attaching the identification member 60. It can be understood that the above-mentioned moving operation and attaching operation are both implemented by the adhesive roller 500, that is, the adhesive roller 500 can be used to supplement the movement of the position of the identification member 60 caused by rubbing by moving.

[0040] Preferably, after kneading the battery cell 40, the process further includes: detecting whether the tab 50 and the identification member 60 are located at a preset position, that is, detecting the kneaded battery cell 40. If the tab 50 and the identification member 60 are both located at the preset position, the process proceeds to the next step.

[0041] Furthermore, if the tab 50 is located at the preset position and the identification member 60 is not located at the preset position, the identification member 60 is removed and reattached to the preset position. The above-mentioned removal of the identification member 60 can be performed manually. If the tab 50 is not located at the preset position, it proves that the rubbing correction fails, and it is judged as a defective product and directly discharged.

[0042] Specifically, detecting whether the identification member 60 is located at the preset position includes: taking a photo of the battery cell 40 to determine the position of the identification member 60 relative to the battery cell 40. The photo of the battery cell 40 is taken using a CCD camera, and the CCD camera can be an existing setting in the battery cell winding device, that is, using existing components on the battery cell winding device, which is conducive to reducing equipment costs.

[0043] For example, Figure 3 As shown, the two tabs 50 are both located at one end of the battery cell 40, and the identification member 60 is located along the winding direction of the battery cell 40 (eg Figure 3 As shown by the arrow in the middle) and the middle part in the direction perpendicular to the winding direction. Figure 4 As shown in FIG. 1 , it is a schematic diagram of the positive misalignment of the tab 50 after winding. At this time, the actual position of the tab 50 is shown as the dotted line. Accordingly, the identification member 60 needs to be attached to the front along the misalignment direction of the tab 50 (as shown in the shaded part) and rubbed in the reverse direction (the same direction as the winding direction of the winding needle) to move the tab 50 and the identification member 60 in the opposite direction of the misalignment direction of the tab 50. Figure 5 As shown, it is a schematic diagram of negative misalignment of the pole ear 50 after winding. At this time, the actual position of the pole ear 50 is shown as the dotted line. Accordingly, it is necessary to attach the identification piece 60 in front of the misalignment direction of the pole ear 50 (as shown in the shaded part) and rub it in the forward direction (the direction opposite to the winding direction of the winding needle), so as to move both the pole ear 50 and the identification piece 60 in the opposite direction of the misalignment direction of the pole ear 50.

[0044] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A battery core winding method, characterized in that the steps include: Winding the positive electrode sheet (10), the negative electrode sheet (20) and the separator (30) to form a battery core (40); Obtaining a tab misalignment parameter, and determining whether the tab misalignment parameter is within a preset misalignment interval; If the product is not in the preset misalignment range, it is judged as unqualified and directly discarded; In the preset misalignment interval, if the misalignment parameter of the pole tab is within the non-correction range, the identification piece (60) is normally attached to the outside of the battery cell (40) without rubbing, and the next process is entered; if the misalignment parameter of the pole tab is within the correction range, the identification piece (60) is attached to the outside of the battery cell (40), and there is an offset between the identification piece (60) and the preset position, then the battery cell (40) is rubbed to ensure that the pole tab (50) and the identification piece (60) are both located at the preset positions.

2. The battery core winding method according to claim 1, characterized in that: Kneading the battery core (40) comprises: pressing the end pressing roller (200) against the battery core (40) at a preset pressure, and driving the battery core (40) to rotate at a preset angle in a preset direction.

3. The battery core winding method according to claim 2, characterized in that: The preset pressure is set to 0.1Mpa-0.45Mpa.

4. The battery core winding method according to claim 1, characterized in that: When the tab misalignment parameter is within the deviation correction range, before attaching the identification piece (60), the method further includes: obtaining an attachment misalignment parameter of the identification piece (60); and attaching the identification piece (60) according to the attachment misalignment parameter.

5. The battery core winding method according to claim 4, characterized in that: The attachment misalignment parameters include a misalignment direction and a misalignment distance between the identification member (60) and the tab (50); attaching the identification member (60) according to the attachment misalignment parameters includes moving the identification member (60) along the misalignment direction by the misalignment distance, and then attaching the identification member (60).

6. The battery core winding method according to claim 1, characterized in that: After kneading the battery cell (40), the process further includes: detecting whether the tab (50) and the identification member (60) are located at the preset position; if both the tab (50) and the identification member (60) are located at the preset position, proceeding to the next process.

7. The battery core winding method according to claim 6, characterized in that: If the pole lug (50) is located at the preset position and the identification member (60) is not located at the preset position, the identification member (60) is removed and reattached to the preset position.

8. The battery core winding method according to claim 6, characterized in that: If the electrode tab (50) is not located at the preset position, it is determined to be a defective product and is directly discarded.

9. The battery core winding method according to claim 6, characterized in that: Detecting whether the identification element (60) is located at the preset position comprises: taking a photo of the battery cell (40) and determining the position of the identification element (60) relative to the battery cell (40).

10. A battery cell winding device, characterized in that: The battery cell (40) can be wound using the battery cell winding method as described in any one of claims 1 to 9, and the battery cell winding device includes: a winding needle (100), a tail pressure roller (200), a pole tab misalignment detection device, and a glue sticking roller (500); the winding needle (100) is used to wind the positive electrode sheet (10), the negative electrode sheet (20) and the separator (30); the tail pressure roller (200) can move closer to or away from the winding needle (100); the pole tab misalignment detection device is used to detect and obtain pole tab misalignment parameters; the glue sticking roller (500) can move in two directions perpendicular to the axis of the winding needle (100) to attach the identification member (60) to a preset position or to attach the identification member (60) to a position offset from the preset position.

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