Positioning mechanism and soft package battery packaging positioning method

Abstract

The application discloses a positioning mechanism and a soft package battery packaging positioning method, and the positioning mechanism comprises a coarse positioning module, a fine positioning module and a dynamic compensation module. The coarse positioning module comprises an adjustable vacuum suction head and a porous adsorption platform. When lug welding is performed, the lug is fixed and clamped through the adjustable vacuum suction head, and the electrode sheet is fixed by vacuum negative pressure through the porous adsorption platform. The adjustable vacuum suction head is used for adjusting the structure according to different specifications of the lug, so as to balance the suction force of the adjustable vacuum suction head and the gravity of the lug. The fine positioning module comprises an image sensor and a controller. When lug welding is performed, the real-time position condition of the electrode sheet at the welding position is collected through the image sensor, and the controller adjusts the welding position of the lug according to the real-time position condition of the electrode sheet. The dynamic compensation module obtains the real-time position condition of the electrode sheet and dynamically adjusts when the position deviation exceeds the limit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soft package battery production, in particular to a positioning mechanism and a soft package battery packaging positioning method. BACKGROUND

[0002] Soft package battery packaging refers to the process of processing materials such as positive and negative electrodes, separators and electrolytes into a complete battery assembly through a series of fine processes. Battery packaging is an important link in battery production, which directly affects the performance and service life of the battery. The packaging process generally includes: electrode mixing, electrode sheet forming, separator and electrolyte injection, electrode sheet assembly and packaging. In battery production, packaging is a very important process link, which needs to be precisely controlled in terms of material selection, packaging method and packaging process, etc. to ensure the performance and service life of the battery.

[0003] Among them, in the specific packaging process of the soft package battery, the tab as the core channel for connecting the battery core and the external circuit, the position accuracy directly determines the electrical performance, safety and consistency of the battery. If the tab alignment deviation is too large, it may cause virtual connection or short circuit risk of welding, and cause local overheating or even thermal runaway; at the same time, if the plastic film heat sealing area cannot be accurately matched with the tab, it will damage the packaging sealing, causing electrolyte leakage or environmental water vapor intrusion, which seriously affects the battery cycle life and protection level. In addition, during the modular assembly of the power battery, the tab position error will be accumulated in the multi-cell series connection, resulting in overall size deviation or connection sheet stress concentration of the module. Therefore, high-precision positioning of the tab is a key technical barrier to ensure the energy transmission efficiency, safety and reliability of the battery and the qualification rate of large-scale production.

[0004] In view of this, the present application provides a positioning mechanism and a soft package battery packaging positioning method, which improves the position positioning of the tab and the electrode sheet during tab welding by adopting a multi-level positioning strategy of coarse positioning, fine positioning and dynamic compensation, and realizes high-precision positioning in soft package battery packaging.

[0005] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art with respect to the present application. SUMMARY

[0006] In order to solve the above technical problems, the purpose of the present application is to provide a positioning mechanism and a soft package battery packaging positioning method, which improves the position positioning of the tab and the electrode sheet during tab welding by adopting a multi-level positioning strategy of coarse positioning, fine positioning and dynamic compensation, and realizes high-precision positioning in soft package battery packaging.

[0007] In order to achieve the above object, one aspect of the present application provides a positioning mechanism, which comprises a coarse positioning module, a fine positioning module and a dynamic compensation module. The coarse positioning module comprises an adjustable vacuum suction head and a porous adsorption platform. The adjustable vacuum suction head is used to fix and clamp the tab during tab welding, and the porous adsorption platform is used to apply vacuum negative pressure to fix the electrode sheet, so as to realize the synchronous pre-positioning of the tab and the electrode sheet. The adjustable vacuum suction head is used to adjust the structure according to the tabs of different specifications, so as to balance the suction force of the adjustable vacuum suction head and the gravity of the tab, and prevent the adjustable vacuum suction head from damaging the tab. The fine positioning module comprises an image sensor and a controller. The image sensor is used to collect the real-time position of the electrode sheet at the welding position during tab welding, and the controller is used to adjust the welding position of the tab according to the real-time position of the electrode sheet. The dynamic compensation module is used to obtain the real-time position of the electrode sheet collected by the image sensor and to dynamically adjust the position when the position deviation exceeds the limit.

[0008] Further, in the technical scheme of the present application, the adjustable vacuum suction head comprises an inner metal suction pipe and an outer elastic ring. The outer elastic ring is movably installed at the bottom end of the inner metal suction pipe, so as to adjust the installation height of the outer elastic ring according to the tabs of different specifications. The specific adjustment method is as follows:

[0009] ;

[0010] ;

[0011] In the formula: represents the suction force of the inner metal suction pipe, represents the negative pressure for adsorption, represents the suction area of the inner metal suction pipe, represents the gravity of the tab, represents the elastic coefficient of the outer elastic ring, represents the installation height, and the installation height represents the height of the installation bottom end of the outer elastic ring from the bottom end of the inner metal suction pipe.

[0012] Further, in the technical scheme of the present application, a plurality of adsorption micropores are arranged on the porous adsorption platform, and the electrode plate is adsorbed in the lug welding process through negative pressure, and a buffer ring is arranged at each adsorption micropore to prevent damage to the electrode plate during negative pressure adsorption; a pressure relief structure is further arranged at the bottom end of the porous adsorption platform, the pressure relief structure comprises a pressure relief hole in communication with the adsorption micropore, a movable valve is arranged in the pressure relief hole, one end of the movable valve is connected with a measuring spring, and a negative pressure port is further arranged on one side of the pressure relief hole in communication with the adsorption micropore, and the maximum negative pressure allowed by the pressure relief structure is:

[0013] ;

[0014] In the formula: represents the maximum negative pressure allowed, represents the gravity of the movable valve, represents the elastic coefficient of the measuring spring, represents the safety length, and the length represents the length from the bottom end of the movable valve to the negative pressure port.

[0015] Further, in the technical scheme of the present application, the controller adjusts the welding position of the lug according to the real-time position of the electrode plate, and specifically comprises:

[0016] M1, calculating the position deviation:

[0017] ;

[0018] In the formula: represents the position deviation of the electrode plate at the welding position, represents the real-time position of the electrode plate at the welding position, represents the preset position of the electrode plate at the welding position;

[0019] M2, adjusting the welding position of the lug according to the position deviation to adjust the welding position of the lug.

[0020] Further, in the technical scheme of the present application, the dynamic compensation module dynamically adjusts when the position deviation exceeds the limit, and specifically comprises:

[0021] N1, determining the position deviation :

[0022] without adjustment;

[0023] dynamic adjustment;

[0024] In the formula: represents the allowable error;

[0025] N2, dynamically adjusting, adjusting the electrode sheet conveying speed:

[0026]

[0027]

[0028] In the formula: N1 represents the adjusted electrode sheet conveying speed, N2 represents the default electrode sheet conveying speed, N3 represents the electrode sheet conveying time period, N4 represents the interval between adjacent electrode sheets.

[0029] Another aspect of the present application also provides a soft package battery packaging positioning method, which adopts the positioning mechanism according to the above description, and specifically includes the following steps:

[0030] S1, coarse positioning: the tab and the electrode sheet are synchronously pre-positioned by the coarse positioning module when the tab is welded, the tab is fixed and clamped by the adjustable vacuum suction head, and the electrode sheet is fixed by the multi-hole adsorption platform under vacuum negative pressure;

[0031] S2, fine positioning: the real-time position of the electrode sheet at the welding position is collected by the image sensor when the tab is welded, and the welding position of the tab is adjusted by the controller according to the real-time position of the electrode sheet;

[0032] S3, dynamic compensation: the real-time position of the electrode sheet collected by the image sensor is obtained and dynamically adjusted when the position deviation exceeds the limit.

[0033] Effective gain: as described above, the present application provides a positioning mechanism and a soft package battery packaging positioning method. In the technical solution of the present application, the multi-stage positioning strategy of coarse positioning, fine positioning and dynamic compensation is adopted to improve the position positioning of the tab and the electrode sheet during tab welding, and high-precision positioning in soft package battery packaging is realized. Specifically, on the one hand, the inner metal suction tube and the outer elastic ring are combined in the coarse positioning of the present application to form a suction head structure for adsorbing and fixing the tab. The inner metal suction tube is more stable in adsorbing the tab, and the outer elastic ring can buffer the suction force of the inner metal suction tube to prevent the tab from being damaged. On the other hand, the present application analyzes the real-time position of the electrode sheet at the welding position during tab welding, adjusts the welding position of the tab, and dynamically adjusts when the position deviation exceeds the limit, which is conducive to high-precision positioning of the tab welding in soft package battery packaging.

[0034] Other features and advantages of the present application will be described in the subsequent description. BRIEF DESCRIPTION OF DRAWINGS

[0035] ​​In order to more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0036] Figure 1 Part structure diagram of the positioning mechanism of the present application;

[0037] Figure 2 Part structure diagram of the adjustable vacuum suction head of the present application;

[0038] Figure 3 Part structure diagram of the porous adsorption platform of the present application;

[0039] Figure 4 Part structure diagram of the pressure relief structure of the present application;

[0040] In the figure: A, electrode sheet; B, tab; a, inner metal suction pipe; b, outer elastic ring; c, adsorption micropore; d, pressure relief hole; e, movable valve; f, measurement spring; g, negative pressure port. DETAILED DESCRIPTION

[0041] In order to make the purpose, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort are within the scope of protection of the present application.

[0042] The core of the embodiments of the present application is to provide a positioning mechanism and a soft package battery packaging positioning method. By adopting a multi-level positioning strategy of coarse positioning, fine positioning and dynamic compensation, the position of the tab and the electrode sheet during tab welding is improved, and high-precision positioning in soft package battery packaging is achieved.

[0043] In order to solve the above technical problems, the embodiments of the present application propose a positioning mechanism on the one hand, Figure 1 Part structure diagram of the positioning mechanism of the present application, as shown in Figure 1As shown, in the embodiment, the positioning mechanism includes a coarse positioning module, a fine positioning module and a dynamic compensation module. The coarse positioning module includes an adjustable vacuum suction head and a multi-hole adsorption platform. When performing welding of the tab B, the coarse positioning module fixes and clamps the tab B through the adjustable vacuum suction head, and simultaneously applies vacuum negative pressure to the electrode plate A through the multi-hole adsorption platform to realize synchronous pre-positioning of the tab B and the electrode plate A. The adjustable vacuum suction head is used to adjust the structure according to the tab B of different specifications, so as to balance the suction force of the adjustable vacuum suction head and the gravity of the tab B, and prevent the adjustable vacuum suction head from causing damage to the tab B. The fine positioning module includes an image sensor and a controller. When performing welding of the tab B, the fine positioning module collects the real-time position condition of the electrode plate A at the welding position through the image sensor, and the controller adjusts the welding position of the tab B according to the real-time position condition of the electrode plate A. The dynamic compensation module obtains the real-time position condition of the electrode plate A collected by the image sensor and performs dynamic adjustment when the position deviation exceeds the limit.

[0044] Specifically, in the embodiment, Figure 2 is a partial structure diagram of the adjustable vacuum suction head of the application, as shown in Figure 2 The adjustable vacuum suction head includes an inner metal suction pipe a and an outer elastic ring b. The outer elastic ring b is movably installed at the bottom end of the inner metal suction pipe a. The installation height of the outer elastic ring b can be adjusted according to the tab B of different specifications. The specific adjustment method is as follows:

[0045] ;

[0046] ;

[0047] In the formula: represents the suction force of the inner metal suction pipe a, represents the negative pressure intensity for adsorption, represents the suction port area of the inner metal suction pipe a, represents the gravity of the tab B, represents the elastic coefficient of the outer elastic ring b, represents the installation height, and the installation height represents the height from the installation bottom end of the outer elastic ring b to the bottom end of the inner metal suction pipe a.

[0048] It should be noted that the installation height of the outer elastic ring b is adjusted according to the tab B of different specifications In the process of adjusting the gravity of the different tabs B, the purpose is to balance the suction force of the outer elastic ring b on the inner metal suction pipe a, by adjusting the installation height of the outer elastic ring b, the compressible distance of the outer elastic ring b is adjusted, and further the elastic force of the outer elastic ring b is adjusted, and the suction force of the outer elastic ring b on the inner metal suction pipe a is balanced to prevent the suction force from being too large to cause damage to the tab B. Because the suction head adopts a full elastic structure, the contact between the suction head and the tab B is elastic, and during the welding process of the tab B, contact errors will occur. Therefore, the suction head structure of the inner metal suction pipe a and the outer elastic ring b is combined, the inner metal suction pipe a is more stable for adsorbing the tab B, and the outer elastic ring b is used to buffer the suction force of the inner metal suction pipe a, which is not easy to cause contact damage to the tab B.

[0049] Specifically, in the present embodiment, Figure 3 is a part of the structure of the porous adsorption platform of the present application, as shown in Figure 3 A plurality of adsorption micropores c are provided on the porous adsorption platform, and the electrode plate A is adsorbed by negative pressure during the welding process of the tab B. A buffer ring is installed at each adsorption micropore c to prevent damage to the electrode plate A during negative pressure adsorption, i.e. to prevent damage to the electrode plate A during negative pressure adsorption. The inner edge of the adsorption micropore c; wherein the bottom end of the porous adsorption platform is also provided with a pressure relief structure, the pressure relief structure comprises a pressure relief hole d in communication with the adsorption micropore, the pressure relief hole d is provided with a movable valve e, one end of the movable valve e is connected with a measuring spring f, and the other side of the pressure relief hole d is provided with a negative pressure port g in communication with the adsorption micropore c. The maximum negative pressure allowed by the pressure relief structure is:

[0050] ;

[0051] In the formula: represents the maximum negative pressure allowed, represents the gravity of the movable valve e, represents the elastic coefficient of the measuring spring f, represents the safety length, the length represents the length of the bottom end of the movable valve e from the negative pressure port g.

[0052] It should be noted that the pressure relief structure of the present embodiment adopts a full mechanical structure combination, which is stable in structure and can generate activity in real time during the negative pressure process, and the pressure relief reaction is rapid. By adjusting the counterweight of the movable valve e, i.e. adjusting the size of , the maximum negative pressure of the pressure relief structure can be adjusted.

[0053] Specifically, in the present embodiment, the controller adjusts the welding position of the tab B according to the real-time position of the electrode plate A, which specifically includes:

[0054] M1, calculate the position deviation:

[0055] ;

[0056] In the formula: represents the position deviation of the welding electrode piece A, represents the real-time position of the welding electrode piece A, represents the preset position of the welding electrode piece A;

[0057] M2, adjust the welding position of the tab B, according to the position deviation Adjust the welding position of the tab B, that is, adjust the welding position of the tab B, and the adjustment amount is .

[0058] Specifically, in the present embodiment, the dynamic compensation module performs dynamic adjustment when the position deviation exceeds the limit, which specifically includes:

[0059] N1, determine the position deviation :

[0060] , no adjustment is needed;

[0061] , dynamic adjustment is performed;

[0062] In the formula: represents the allowable error;

[0063] N2, dynamic adjustment, adjust the conveying speed of the electrode piece A:

[0064] ;

[0065] ;

[0066] In the formula: represents the adjusted conveying speed of the electrode piece A, represents the default conveying speed of the electrode piece A, represents the conveying time period of the electrode piece A, represents the interval between adjacent electrode pieces A.

[0067] The present embodiment also provides a soft package battery packaging positioning method, which adopts the positioning mechanism according to the above method, and specifically includes the following steps:

[0068] S1, coarse positioning: when welding the tab B, the coarse positioning module is used to pre-position the tab B and the electrode piece A synchronously, the adjustable vacuum suction head is used to fix and clamp the tab B, and the multi-hole adsorption platform is used to apply vacuum negative pressure to fix the electrode piece A;

[0069] S2, fine positioning: the real-time position of the electrode tab A at the welding position is collected by the image sensor during the welding of the electrode tab B, and the controller adjusts the welding position of the electrode tab B according to the real-time position of the electrode tab A;

[0070] S3, dynamic compensation: the real-time position of the electrode tab B collected by the image sensor is obtained, and dynamic adjustment is performed when the position deviation exceeds the limit.

[0071] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples. The above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application. These changes and improvements fall within the scope of the claimed application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A positioning mechanism, characterized by, The positioning mechanism comprises a coarse positioning module, a fine positioning module and a dynamic compensation module. The coarse positioning module comprises an adjustable vacuum suction head and a porous adsorption platform, and is used for fixing and clamping the tab by the adjustable vacuum suction head and fixing the electrode sheet by the porous adsorption platform to realize synchronous pre-positioning of the tab and the electrode sheet during tab welding. The fine positioning module comprises an image sensor and a controller, and is used for collecting real-time position information of the electrode sheet at the welding position by the image sensor and adjusting the welding position of the tab by the controller according to the real-time position information of the electrode sheet. A dynamic compensation module is configured to obtain real-time position information of the electrode sheet collected by the image sensor and to perform dynamic adjustment when the position deviation exceeds the limit. The adjustable vacuum suction head includes an inner metal suction pipe and an outer elastic ring. The outer elastic ring is movably installed at the bottom end suction port of the inner metal suction pipe to adjust the installation height of the outer elastic ring according to electrode tabs of different specifications. The specific adjustment method is as follows: , wherein, represents the suction force of the inner metal suction pipe, represents the negative pressure for suction, represents the suction port area of the inner metal suction pipe, represents the gravity of the electrode tab, represents the elastic coefficient of the outer elastic ring, represents the installation height, and the installation height represents the height of the installation bottom end of the outer elastic ring from the bottom end suction port of the inner metal suction pipe. A plurality of groups of suction micropores are formed in the multi-hole suction platform. The electrode sheet is suctioned by negative pressure during the electrode tab welding process. A buffer ring is installed at each suction micropore to prevent damage to the electrode sheet during negative pressure suction. A pressure relief structure is further installed at the bottom end of the multi-hole suction platform. The pressure relief structure includes a pressure relief hole in communication with the suction micropores. An active valve is arranged in the pressure relief hole. One end of the active valve is connected to a measurement spring. A negative pressure port is further arranged on one side of the pressure relief hole in communication with the suction micropores. The maximum negative pressure allowed by the pressure relief structure is: wherein, represents the maximum negative pressure allowed, represents the gravity of the active valve, represents the elastic coefficient of the measurement spring, represents the safety length, and the length represents the length of the bottom end of the active valve from the negative pressure port.

2. A positioning mechanism according to claim 1, wherein The controller adjusts the welding position of the tab according to the real-time position information of the electrode sheet, and the adjustment specifically comprises: M1, calculate position deviation: ; In the formula: position deviation of the electrode piece at the welding position, real-time position of the electrode piece at the welding position, preset position of the electrode piece at the welding position; M2, adjust the welding position of the tab, according to the position deviation Adjust the welding position of the tab.

3. A positioning mechanism according to claim 2, wherein The dynamic compensation module dynamically adjusts when the position deviation exceeds the limit, and the dynamic adjustment specifically comprises: N1, on position deviation Make a decision: No adjustment needed; , dynamic adjustment is made; In the formulae: is expressed as an allowable error; N2, dynamic adjustment, adjusting the conveying speed of the electrode sheet. ， ； In the formulae: is represented as an adjusted electrode tab transport speed, is represented as a default electrode tab transport speed, is represented as an electrode tab transport time period, is represented as an adjacent electrode tab spacing.

4. A pouch battery packaging positioning method characterized by, The positioning mechanism according to claim 3 comprises the following steps: S1, coarse positioning: the coarse positioning module is used for synchronous pre-positioning of the tab and the electrode sheet during tab welding, the tab is fixed and clamped by the adjustable vacuum suction head, and the electrode sheet is fixed by vacuum negative pressure by the porous adsorption platform; S2, fine positioning: the image sensor is used for collecting real-time position information of the electrode sheet at the welding position, and the controller adjusts the welding position of the tab according to the real-time position information of the electrode sheet; S3, dynamic compensation: the real-time position information of the electrode sheet collected by the image sensor is obtained, and dynamic adjustment is performed when the position deviation exceeds the limit.

Images