Battery cell deviation correction device and battery cell deviation correction method

Abstract

A battery cell deflection correction device and a battery cell deflection correction method are used for assembling a battery cell. The battery cell includes a shell, a pole core, and a first pole lug and a second pole lug connected to the pole core. The pole lug deflection correction device includes a detection component, a first deflection correction component, and a second deflection correction component. The detection component is suitable for detecting the positions of the first pole lug and the second pole lug; the first deflection correction component is suitable for driving the first pole lug to move to a first target position according to the current position of the first pole lug detected by the detection component; the second deflection correction component is suitable for driving the second pole lug to move to a second target position according to the current position of the second pole lug detected by the detection component. By setting the first deflection correction component to drive the first pole lug to move to the first target position, and the second deflection correction component to drive the second pole lug to move to the second target position, the battery cell deflection correction device can adjust the exposed dimensions of the first pole lug and the second pole lug to ensure that the exposed dimensions of the first pole lug and the second pole lug are both qualified, and the yield rate of the battery cell can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production equipment, and in particular to a battery cell deviation correction device and a battery cell deviation correction method. Background Art

[0002] During the battery production process, the core and the shell need to be assembled. During the assembly process, the position of the core relative to the shell will shift, and the position of the tab connected to the core will also change. If the size of the tab exposed from the shell is not up to standard, it will affect the quality of the battery cell and thus the yield rate of the product. Summary of the invention

[0003] The purpose of the present application is to provide a battery cell correction device and a battery cell correction method, which can adjust the exposed size of the tab and improve the product yield.

[0004] To achieve the purpose of this application, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a battery cell correction device, which is used for assembling battery cells, wherein the battery cell comprises a shell, a pole core, and a first pole ear and a second pole ear connected to the pole core, and the pole core is accommodated in the shell, and the battery cell correction device comprises a detection component, a first correction component and a second correction component, the detection component is suitable for detecting the positions of the first pole ear and the second pole ear; the first correction component is suitable for driving the first pole ear to move to a first target position according to the current position of the first pole ear detected by the detection component; the second correction component is suitable for driving the second pole ear to move to a second target position according to the current position of the second pole ear detected by the detection component.

[0006] In one embodiment, the battery cell deviation correction device further includes a pre-sealing component, and the pre-sealing component is suitable for pre-sealing the housing, the first pole tab, and the second pole tab.

[0007] In one embodiment, the battery cell correction device also includes a fixing component, and the fixing component includes a first fixing member, a first limiting member and a second limiting member, the first fixing member is suitable for fixing the outer shell, the first limiting member is suitable for limiting the first pole ear, and the second limiting member is suitable for limiting the second pole ear.

[0008] In a second aspect, the present application also provides a method for correcting deviation of a battery cell, comprising:

[0009] Detecting positions of the first pole lug and the second pole lug;

[0010] According to the detected current position of the first pole tab, the first deviation-correcting component drives the first pole tab to move to a first target position;

[0011] According to the detected current position of the second pole tab, the second deviation-correcting assembly drives the second pole tab to move to a second target position.

[0012] In one embodiment, it further includes:

[0013] Providing a fixing assembly, wherein the fixing assembly fixes the housing and limits the first pole lug and the second pole lug;

[0014] Detecting current positions of the first pole lug and the second pole lug to obtain a first position of the first pole lug and a second position of the second pole lug;

[0015] When the offset value between the first position and the first target position is greater than a preset value, the first deviation-correcting component drives the first pole ear to move;

[0016] When the offset value between the second position and the second target position is greater than a preset value, the second deviation-correcting component drives the second pole tab to move.

[0017] In one implementation, detecting the current positions of the first pole lug and the second pole lug includes:

[0018] When the offset value between the first position and the first target position is less than or equal to a preset value, and the offset value between the second position and the second target position is less than or equal to a preset value, the fixing component is separated from the battery cell.

[0019] In one embodiment, the first deviation-correcting component drives the first pole tab to move, and the second deviation-correcting component drives the second pole tab to move, including:

[0020] When the offset value between the first position and the first target position is greater than a preset value, the first deviation-correcting component drives the first pole ear to move toward or away from the housing to reduce the offset value between the first position and the first target position;

[0021] And / or, when the offset value between the second position and the second target position is greater than a preset value, the second deviation-correcting assembly drives the second pole ear to move toward or away from the housing to reduce the offset value between the second position and the second target position.

[0022] In one embodiment, the first deviation-correcting component drives the first pole tab to move, and the second deviation-correcting component drives the second pole tab to move, further comprising:

[0023] Detecting the first pole lug and the second pole lug after the movement to obtain a third position of the first pole lug and a fourth position of the second pole lug;

[0024] When the offset value between the third position and the first target position is greater than a preset value, and / or the offset value between the fourth position and the second target position is greater than a preset value, the battery cell is discharged.

[0025] In one embodiment, detecting the first pole tab and the second pole tab after the movement further includes:

[0026] When the offset value between the third position and the first target position is less than or equal to a preset value, and the offset value between the fourth position and the second target position is less than or equal to a preset value, the housing, the first tab and the second tab are pre-sealed.

[0027] In one embodiment, it further includes:

[0028] After the housing, the first pole tab and the second pole tab are pre-sealed, the fixing assembly is separated from the battery cell.

[0029] By setting a detection component, a first correction component and a second correction component, the detection component detects the current positions of the first pole ear and the second pole ear, the first correction component is suitable for driving the first pole ear to move to the first target position, and the second correction component is suitable for driving the second pole ear to move to the second target position. The battery cell correction device can adjust the exposed dimensions of the first pole ear and the second pole ear to ensure that the exposed dimensions of the first pole ear and the second pole ear are qualified, thereby improving the yield rate of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 is a schematic diagram of a battery cell deviation correction device according to an embodiment;

[0032] Figure 2 is a partial flow chart of a method for correcting deviation of a battery cell according to an embodiment;

[0033] Figure 3 The present invention is a flow chart of a method for correcting deviation of a battery cell according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 100 - battery cell correction device, 10 - support frame, 21 - first correction member, 22 - second correction member, 31 - pre-sealing cylinder, 32 - pre-sealing head, 41 - first fixing member, 42 - first limiting member, 43 - second limiting member. DETAILED DESCRIPTION

[0036] 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 application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0039] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0040] Please refer to Figure 1 An embodiment of the present application provides a battery cell correction device 100, which is used for assembling a battery cell. The battery cell includes a shell, a pole core, and a first pole ear and a second pole ear connected to the pole core.

[0041] The battery cell deflection correction device 100 includes a detection component (not shown in the figure), a first deflection correction component and a second deflection correction component. The detection component is suitable for detecting the positions of the first pole lug and the second pole lug; the first deflection correction component is suitable for driving the first pole lug to move to the first target position according to the current position of the first pole lug detected by the detection component; the second deflection correction component is suitable for driving the second pole lug to move to the second target position according to the current position of the second pole lug detected by the detection component.

[0042] First define the direction. Figure 1 As shown, X is the first direction, Y is the second direction, and Z is the third direction.

[0043] Optionally, the battery cell may be a laminated battery cell, a wound battery cell, etc., without limitation.

[0044] Optionally, the electrode core includes a positive electrode sheet, a negative electrode sheet and a separator, and the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence to form the electrode core. The pole ear and the electrode core can be an integrated structure or a split structure, and the pole ear and the electrode core are connected by welding, bonding, clamping, screwing, etc., without specific limitation.

[0045] Optionally, the battery cell may be connected to a plurality of tabs, including a positive tab and a negative tab, which may be disposed at the same end of the battery cell, or at opposite or adjacent ends of the battery cell, without limitation.

[0046] Optionally, in one embodiment, a pole ear is respectively provided at two opposite ends of the pole core.

[0047] Optionally, the battery cell may be a soft-pack battery cell or a hard-shell battery cell, that is, the outer shell of the battery cell may be a soft shell or a hard shell without limitation.

[0048] Optionally, the detection component includes a detection member commonly used in the art. In one embodiment, the detection member is a CCD camera, that is, an industrial visual inspection camera using a charge-coupled device (CCD) as a photosensitive element. CCD, as a semiconductor device, can convert optical images into digital signals. In a CCD camera, light enters the camera through a lens and is focused on a CCD chip. Each CCD pixel is like a small capacitor that can collect and store charges generated by light irradiation. These charges are then converted into electrical signals, which are processed and amplified and ultimately converted into digital image data. The detection member is suitable for detecting the position of the pole ear, and the offset value of the position of the pole ear and the preset position is calculated by the position of the pole ear detected by the detection member.

[0049] Optionally, the battery cell correction device 100 includes a support frame 10, which is assembled from a variety of structural parts. The various structural parts are connected and fixed by welding, bonding, clamping, screwing, etc., which can ensure the structural strength of the support frame 10 and its strong load-bearing capacity.

[0050] Optionally, the detection member is connected and fixed to the support frame 10 and is located above the pole ear in the third direction Z. The connection between the detection member and the support frame 10 can be welding, bonding, clamping, screwing, etc., without specific limitation. When the battery cell deviation correction device 100 is placed on the bottom surface and is in use, the direction of gravity is the third direction Z, and the top of the pole ear is the side of the pole ear away from the bottom surface in the third direction Z.

[0051] Optionally, the battery cell deviation correction device 100 further includes a display component, which is fixedly connected to the support frame 10 and electrically connected to the detection component. The display component can be a display screen commonly used in the art, and the number of times the detection component is triggered to take pictures can be viewed through the display component, which is convenient for quickly finding the cause of the problem when a fault occurs in the interaction with the detection component.

[0052] Optionally, the first correcting assembly and the second correcting assembly are arranged relative to each other and have a gap therebetween, and the gap is suitable for accommodating the battery cell.

[0053] Optionally, the first deflection-correcting component and the second deflection-correcting component may be arranged relative to each other in the first direction X, or may be arranged relative to each other in the second direction Y, without any specific limitation. Figure 1 As shown, the first correcting component and the second correcting component are arranged opposite to each other in the second direction Y.

[0054] Optionally, the first correcting component includes a first correcting piece 21, and the second correcting component includes a second correcting piece 22. The first correcting piece 21 drives the first pole ear to move, and the second correcting piece 22 drives the second pole ear to move. The first correcting piece 21 and the second correcting piece 22 are both correcting pieces commonly used in the field, and there is no specific limitation.

[0055] During the battery production process, the core and the shell need to be assembled. During the assembly process, the position of the core relative to the shell will shift, and the position of the tab connected to the core will also change. If the size of the tab exposed from the shell is not up to standard, it will affect the quality of the battery cell and thus the yield rate of the product.

[0056] The battery cell correction device 100 in the embodiment of the present application is configured with a detection component, a first correction component and a second correction component. The detection component detects the current positions of the first pole ear and the second pole ear. The first correction component is suitable for driving the first pole ear to move to the first target position, and the second correction component is suitable for driving the second pole ear to move to the second target position. The battery cell correction device 100 can adjust the exposed dimensions of the first pole ear and the second pole ear to ensure that the exposed dimensions of the first pole ear and the second pole ear are qualified, thereby improving the yield rate of the product.

[0057] Optionally, the battery cell deviation correction device 100 further includes a pre-sealing component, which is suitable for pre-sealing the housing, the first pole tab and the second pole tab.

[0058] Optionally, the pre-sealing assembly includes a pre-sealing head 32 and a pre-sealing cylinder 31, the pre-sealing head 32 is suitable for pre-sealing the shell and the corrected pole ear, the pre-sealing cylinder 31 is connected to the pre-sealing head 32, and is used to drive the pre-sealing head 32 to move toward or away from the battery cell.

[0059] Optionally, the pre-sealed component is disposed above the battery cell in the third direction Z and is connected and fixed to the support frame 10 , and the connection method may be welding, bonding, clamping, screwing, etc., without specific limitation.

[0060] During pre-sealing, the pre-sealing head 32 moves toward the battery cell under the drive of the pre-sealing cylinder 31, and pre-seales the shell and the first and second pole ears after the deviation correction is completed, so as to avoid the battery cell from shaking during the process of moving to the next station, causing the first and second pole ears to shift relative to the shell again. After the pre-sealing is completed, the pre-sealing head 32 moves away from the battery cell under the drive of the pre-sealing cylinder 31, so as to avoid interference with the battery cell during the process of moving the battery cell to the next station.

[0061] The existing battery cell correction device 100 does not have a pre-sealing component. Since the pole core is not fixed to the shell, the battery cell shakes before entering the next process, which will cause a secondary deviation of the pole ear size, resulting in the correction having no significant effect on improving the yield of the shell heat-sealed size.

[0062] By configuring the battery cell correction device 100 to also include a pre-sealing component, the pre-sealing component is suitable for pre-sealing the pole core, the first pole lug and the second pole lug, thereby avoiding the battery cell from shaking during the process of moving the battery cell to the next workstation, thereby affecting the correction effect, and improving the product yield.

[0063] Optionally, the support frame 10 of the battery cell correction device 100 has two workstations, and the two workstations can perform correction and pre-sealing at the same time, that is, four pole ears can be corrected and pre-sealed at the same time, with high speed and efficiency and less impact on the whole machine beat.

[0064] Optionally, the battery cell correction device 100 also includes a fixing component, which includes a first fixing member 41, a first limiting member 42 and a second limiting member 43, wherein the first fixing member 41 is suitable for fixing the outer shell, the first limiting member 42 is suitable for limiting the first pole ear, and the second limiting member 43 is suitable for limiting the second pole ear.

[0065] Optionally, in one embodiment, the driving member of the first fixing member 41 is a medium-pressure air belt cylinder, and the driving members of the first limiting member 42 and the second limiting member 43 are both clamping pole ear cylinders. The first fixing member 41 is suitable for contacting the shell and fixing the position of the shell during the pole ear correction and pre-sealing process. The first limiting member 42 is suitable for clamping the first pole ear to prevent the first pole ear from sagging, and the second limiting member 43 is suitable for clamping the second pole ear to prevent the second pole ear from sagging, which can reduce the error generated by the detection component during the detection process, and the first limiting member 42 and the second limiting member 43 are in a clamped and fixed state during the entire process of performing the pole ear correction, ensuring that there will be no rebound after the correction.

[0066] Optionally, the first limiting member 42 may also limit the moving direction of the first pole tab, so that the first pole tab does not move in other directions except when moved by the first deviation-correcting component, thereby reducing detection errors.

[0067] Optionally, the first fixing member 41, the first limiting member 42 and the second limiting member 43 are all connected and fixed to the support frame 10, and the connection method can be welding, bonding, clamping, screwing, etc., without specific limitation.

[0068] Optionally, the fixing assembly further includes a second fixing member, the driving member of the second fixing member is a side pressure cylinder, and the second fixing member is suitable for pressing the connection between the pole core and the first pole lug, and the pole core and the second pole lug.

[0069] By setting up the battery cell correction device 100 also including a fixing component, the first fixing member 41 of the fixing component is suitable for fixing the pole core, the first limiting member 42 is suitable for limiting the first pole ear, the second limiting member 43 is suitable for limiting the second pole ear, and the first limiting member 42 and the second limiting member 43 move with the pole ear, so that the position of the pole core and the pole ear can be fixed during the detection, correction and pre-welding processes, which facilitates the detection component to detect the position of the pole ear and avoids secondary displacement of the pole ear during the pre-welding process.

[0070] Optionally, the present application also provides a method for correcting the deviation of a battery cell, please refer to Figure 2 ,include:

[0071] Step S10, detecting the positions of the first electrode tab and the second electrode tab;

[0072] Step S20, according to the detected current position of the first pole tab, the first deviation-correcting component drives the first pole tab to move to the first target position;

[0073] According to the detected current position of the second pole tab, the second deviation-correcting assembly drives the second pole tab to move to the second target position.

[0074] Optionally, in one embodiment, the detection component includes a CCD camera. The operation of using the detection component to detect the positions of the first pole lug and the second pole lug is to use the qualified battery cell size as the CCD detection reference, and the PLC sends a signal to trigger the CCD camera to take a picture, that is, to detect the positions of the first pole lug and the second pole lug.

[0075] The battery cell correction method in the embodiment of the present application detects the current positions of the first pole ear and the second pole ear. The first correction component drives the first pole ear to move to the first target position according to the current position of the first pole ear detected by the detection component, and the second correction component drives the second pole ear to move to the second target position according to the current position of the second pole ear detected by the detection component. The battery cell correction device 100 can adjust the positions of the first pole ear and the second pole ear at the same time, which can improve work efficiency.

[0076] Optionally, a battery cell deviation correction method further includes:

[0077] Providing a fixing assembly, the fixing assembly fixes the housing and limits the first pole ear and the second pole ear;

[0078] The current positions of the first pole lug and the second pole lug are detected to obtain a first position of the first pole lug and a second position of the second pole lug;

[0079] When the offset value between the first position and the first target position is greater than a preset value, the first correcting assembly drives the first pole ear to move; when the offset value between the second position and the second target position is greater than a preset value, the second correcting assembly drives the second pole ear to move.

[0080] Specifically, the upstream station transfers the battery cell to the tab correction station, and the fixing assembly fixes the battery cell. The first fixing member 41 fixes the housing, the first limiting member 42 clamps the first tab, and the second limiting member 43 clamps the second tab, which can prevent the tab from sagging, reduce the error generated in the subsequent detection process, and ensure that the tab will not rebound after correction.

[0081] After the fixing component is fixed, the pole ear detection CCD camera of the detection component is triggered to detect, and the first position of the first pole ear and the second position of the second pole ear are obtained. The first target position and the second target position are the CCD detection positions of the size of the qualified battery cell. By comparing the first position with the first target position and the second position with the second target position, it can be detected whether the exposed amount of the first pole ear and the second pole ear is qualified.

[0082] When the offset value between the first position and the first target position is greater than a preset value, the first correcting component drives the first pole ear to move; when the offset value between the second position and the second target position is greater than a preset value, the second correcting component drives the second pole ear to move. The positions of the first pole ear and the second pole ear can be adjusted at the same time to improve work efficiency.

[0083] In one embodiment, the current positions of the first pole lug and the second pole lug are detected, including:

[0084] When the offset value between the first position and the first target position is less than or equal to a preset value, and the offset value between the second position and the second target position is less than or equal to a preset value, the fixing component is separated from the battery cell.

[0085] Specifically, the offset value between the first position and the first target position is defined as A1, and the preset value is A0. When the offset value between the first position and the preset standard position is less than or equal to the preset value, that is, A1≤A0, it means that the leakage size of the first pole ear is qualified. Similarly, the offset value between the second position and the second target position is defined as B1, and the preset value is B0. If B1≤B0, it means that the leakage size of the second pole ear is qualified.

[0086] When A1≤A0, and B1≤B0, the cylinder of the fixing assembly drives the first fixing member 41 to separate from the shell, the first limiting member 42 to separate from the first pole ear, and the second limiting member 43 to separate from the second pole ear, and the battery cell enters the next process, that is, enters the pole ear sealing station for pole ear sealing, which can improve production efficiency.

[0087] In one embodiment, the first deviation-correcting component drives the first pole ear to move, and the second deviation-correcting component drives the second pole ear to move, including:

[0088] When the offset value between the first position and the first target position is greater than a preset value, the first deviation-correcting component drives the first pole ear to move toward or away from the housing to reduce the offset value between the first position and the first target position;

[0089] And / or, when the offset value between the second position and the second target position is greater than a preset value, the second deviation-correcting component drives the second pole ear to move toward or away from the housing to reduce the offset value between the second position and the second target position.

[0090] Specifically, the first deviation correction value of the first deviation correction member 21 is calculated according to the offset value between the first position and the first target position, and the second deviation correction value of the second deviation correction member 22 is calculated according to the offset value between the second position and the second target position.

[0091] For example, the first correction value is the servo pull tab position of the first correction member 21 + the left offset of the first tab. The servo clamp tab position of the first correction member 21 is defined as L0, and the left offset value between the first position detected by the detection member and the first target position is L1 (the positive or negative value of the offset value is the offset direction), then the first correction value is L=L0+L1.

[0092] Similarly, the second correction value is the servo pull tab position of the second correction member 22 + the right offset of the second tab. The servo clamp tab position of the second correction member 22 is defined as R0, and the right offset value between the second position detected by the detection member and the second target position is R1 (the positive or negative value of the offset value is the offset direction), then the second correction value is R=R0+R1.

[0093] For example, in one embodiment, a battery cell is qualified if the leakage deviation of the tab of the battery cell is within the range of ±0.5mm. If the first correction value between the first position and the first target position is +0.8, then the first correction value performed by the first correction member 21 is -0.8; if the first correction value between the first position and the first target position is -0.8, then the first correction value performed by the first correction member 21 is +0.8.

[0094] By setting the first correcting member 21 to drive the first pole ear to move so as to reduce the offset value between the first position and the first target position, and the second correcting member 22 to drive the second pole ear to move so as to reduce the offset value between the second position and the second target position, the yield rate of the battery cell can be improved, and the battery cell correcting device 100 can adjust the positions of the first pole ear and the second pole ear to ensure that the exposed dimensions of the first pole ear and the second pole ear are qualified, thereby improving the yield rate of the product.

[0095] In one embodiment, the first deviation-correcting assembly drives the first pole tab to move, and the second deviation-correcting assembly drives the second pole tab to move, further comprising:

[0096] The detection component detects the moved first pole lug and the second pole lug to obtain a third position of the first pole lug and a fourth position of the second pole lug;

[0097] When the offset value between the third position and the first target position is greater than a preset value, and / or the offset value between the fourth position and the second target position is greater than a preset value, the battery cell is discharged.

[0098] Specifically, after the first deflection-correcting component and the second deflection-correcting component complete their operations, the tab detection CCD camera of the detection component is triggered again to perform detection to obtain the third position of the first tab and the fourth position of the second tab.

[0099] The offset value between the third position and the first target position is defined as A2, and the preset value is A0. If the offset value between the third position and the first target position is greater than the preset value, that is, A2>A0, it means that the leakage size of the first pole ear after the correction is still unqualified. Similarly, the offset value between the fourth position and the second target position is defined as B2, and the preset value is B0. If the offset value between the fourth position and the second target position is greater than the preset value, that is, B2>B0, it means that the leakage size of the second pole ear after the correction is still unqualified.

[0100] When A2>A0, and / or B2>B0, the battery cells are discharged and the process of the tab correction station is completed.

[0101] By setting a detection component to detect the first pole ear and the second pole ear after movement, when the offset value between the third position and the first target position is greater than a preset value, and / or the offset value between the fourth position and the second target position is greater than a preset value, the battery cells are discarded and the battery cells that do not meet the pole ear exposure amount are discarded, thereby improving the yield rate of the product.

[0102] In one embodiment, the detection of the first pole lug and the second pole lug after the movement further includes:

[0103] When the offset value between the third position and the first target position is less than or equal to the preset value, and the offset value between the fourth position and the second target position is less than or equal to the preset value, the housing, the first electrode tab and the second electrode tab are pre-sealed.

[0104] Specifically, when A2≤A0 and B2≤B0, it means that the external leakage dimensions of the first pole ear and the second pole ear of the battery cell are qualified after correction. At this time, the pre-sealing cylinder 31 of the pre-sealing assembly drives the pre-sealing head 32 to move toward the shell, and the pre-sealing head 32 pre-seals the first pole ear, the second pole ear and the pole core, avoiding jitter in the process of moving the battery cell to the next workstation and the position shifting again.

[0105] In one embodiment, it further includes:

[0106] After the shell, the first pole ear and the second pole ear are pre-sealed, the fixing assembly is separated from the battery cell.

[0107] Specifically, after the pre-sealing step is completed, the cylinder of the fixing assembly drives the first fixing member 41 to separate from the outer shell, the first limiting member 42 to separate from the first pole ear, and the second limiting member 43 to separate from the second pole ear. The pre-sealed battery cell enters the next process, that is, the pole ear sealing station performs pole ear sealing. The pre-sealed battery cell will not undergo secondary displacement, which can improve the product yield.

[0108] The following is a specific process of the battery cell correction method in the embodiment of the present application, and the flow chart is as follows Figure 3 As shown. After the core film bonding process, the upstream station transfers the battery cell to the tab correction station, and the fixing assembly clamps and fixes the battery cell housing, the first tab, and the second tab. The first correction member 21 reaches the servo tab clamping position L0, and the second correction member 22 reaches the servo tab clamping position R0. The PLC requests the CCD camera of the detection assembly to be triggered, and the first photo detection is performed to obtain the first position of the first tab and the second position of the second tab.

[0109] Define the offset value between the first position and the first target position as A1, the preset value is A0, the offset value between the second position and the second target position is B1, the preset value is B0, if A1≤A0, and B1≤A0, it means that the external leakage size of the tab of the battery cell is qualified, the fixed component is separated from the battery cell, the process of the tab correction station is completed, and the battery cell enters the tab sealing station from the tab correction station for tab sealing.

[0110] If A1>A0, and / or, B1>B0, perform the tab correction action. Specifically, the first correction value of the first correction component 21 is calculated according to the offset value between the first position and the first target position, and the second correction value of the second correction component 22 is calculated according to the offset value between the second position and the second target position. The first correction component 21 drives the first tab to move according to the first correction value, and the second correction component 22 drives the second tab to move according to the second correction value. After the correction action is completed, the PLC requests the CCD camera of the detection component to be triggered for the second time, and performs a second photo detection to obtain the third position of the first tab and the fourth position of the second tab.

[0111] Define the offset value between the third position and the first target position as A2, the preset value is A0, the offset value between the fourth position and the second target position is B2, the preset value is B0, if A2≤A0, and B2≤B0, it means that the external leakage size of the tab of the battery cell is qualified after the deviation correction, and the pre-sealing component pre-seals the battery cell at this time. The pre-sealing cylinder 31 drives the pre-sealing head 32 to approach the battery cell, and the pre-sealing head 32 pre-seals the outer shell, the first tab and the second tab. After the pre-sealing is completed, the pre-sealing cylinder 31 drives the pre-sealing head 32 away from the battery cell. After that, the fixed assembly is separated from the battery cell, and the process of the tab correction station is completed. The battery cell enters the tab sealing station from the tab correction station to seal the tab.

[0112] If A2>A0, and / or B2>B0, it means that the tab leakage size of the battery cell is still unqualified after the correction, and the battery cell is discarded and the process of the tab correction station is completed.

[0113] The battery cell correction device 100 in the present application is configured with a detection component, a first correction component and a second correction component. The detection component detects the current positions of the first pole ear and the second pole ear. The first correction component is suitable for driving the first pole ear to move to the first target position. The second correction component is suitable for driving the second pole ear to move to the second target position. The battery cell correction device 100 can adjust the exposed dimensions of the first pole ear and the second pole ear to ensure that the exposed dimensions of the first pole ear and the second pole ear are qualified, thereby improving the yield rate of the product.

[0114] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0115] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A battery cell deviation correction device, characterized in that: For assembling a battery cell, the battery cell comprises a shell, a pole core, and a first pole ear and a second pole ear connected to the pole core, the pole core is accommodated in the shell, and comprises: A detection component, adapted to detect the positions of the first pole lug and the second pole lug; A first deviation-correcting component, adapted to drive the first pole lug to move to a first target position according to a current position of the first pole lug detected by the detection component; The second deviation-correcting component is adapted to drive the second pole lug to move to a second target position according to the current position of the second pole lug detected by the detecting component.

2. The battery cell deviation correction device according to claim 1, characterized in that: The battery cell deviation correction device further includes a pre-sealing component, which is suitable for pre-sealing the housing, the first pole tab and the second pole tab.

3. The battery core deviation correction device according to claim 1, characterized in that: The tab correction device also includes a fixing assembly, which includes a first fixing member, a first limiting member and a second limiting member. The first fixing member is suitable for fixing the housing, the first limiting member is suitable for limiting the first tab, and the second limiting member is suitable for limiting the second tab.

4. A method for correcting deviation of a battery cell, characterized in that: include: Detecting positions of the first pole lug and the second pole lug; According to the detected current position of the first pole tab, the first deviation-correcting component drives the first pole tab to move to a first target position; According to the detected current position of the second pole tab, the second deviation-correcting assembly drives the second pole tab to move to a second target position.

5. The battery cell deviation correction method according to claim 4, characterized in that: Also includes: Providing a fixing assembly, wherein the fixing assembly fixes the housing and limits the first pole lug and the second pole lug; Detecting current positions of the first pole lug and the second pole lug to obtain a first position of the first pole lug and a second position of the second pole lug; When the offset value between the first position and the first target position is greater than a preset value, the first deviation-correcting component drives the first pole ear to move; When the offset value between the second position and the second target position is greater than a preset value, the second deviation-correcting component drives the second pole tab to move.

6. The battery cell deviation correction method according to claim 5, characterized in that: Detecting current positions of the first pole lug and the second pole lug includes: When the offset value between the first position and the first target position is less than or equal to a preset value, and the offset value between the second position and the second target position is less than or equal to a preset value, the fixing component is separated from the battery cell.

7. The battery cell deviation correction method according to claim 5, characterized in that: The first deviation-correcting component drives the first pole ear to move, and the second deviation-correcting component drives the second pole ear to move, including: When the offset value between the first position and the first target position is greater than a preset value, the first deviation-correcting component drives the first pole ear to move toward or away from the housing to reduce the offset value between the first position and the first target position; And / or, when the offset value between the second position and the second target position is greater than a preset value, the second deviation-correcting assembly drives the second pole ear to move toward or away from the housing to reduce the offset value between the second position and the second target position.

8. The battery cell deviation correction method according to claim 7, characterized in that: The first deviation-correcting assembly drives the first pole tab to move, and the second deviation-correcting assembly drives the second pole tab to move, further comprising: Detecting the first pole lug and the second pole lug after the movement to obtain a third position of the first pole lug and a fourth position of the second pole lug; When the offset value between the third position and the first target position is greater than a preset value, and / or the offset value between the fourth position and the second target position is greater than a preset value, the battery cell is discharged.

9. The method for correcting deviation of a battery cell according to claim 8, characterized in that: Detecting the first pole lug and the second pole lug after the movement, further comprising: When the offset value between the third position and the first target position is less than or equal to a preset value, and the offset value between the fourth position and the second target position is less than or equal to a preset value, the housing, the first tab and the second tab are pre-sealed.

10. The battery cell deviation correction method according to claim 9, characterized in that: Also includes: After the housing, the first pole tab and the second pole tab are pre-sealed, the fixing assembly is separated from the battery cell.

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