Positioning mechanism and soft package battery packaging positioning method

Abstract

The invention discloses a positioning mechanism and a soft package battery packaging positioning method.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, a tab is fixed and clamped through the adjustable vacuum suction head when the tab is welded, and the porous adsorption platform is connected with the fine positioning module; meanwhile, vacuum negative pressure is applied to the electrode plate through the porous adsorption platform to fix the electrode plate, and the adjustable vacuum suction head is used for carrying out structure adjustment according to tabs of different specifications so as to balance the suction force of the adjustable vacuum suction head and the gravity of the tabs; the fine positioning module comprises an image sensor and a controller, the fine positioning module collects the real-time position condition of an electrode plate at the welding position through the image sensor when the electrode plate is welded, and the controller adjusts the welding position of the electrode plate according to the real-time position condition of the electrode plate; the dynamic compensation module obtains the real-time position condition of the electrode plate and carries out dynamic adjustment 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-mentioned purpose, 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 coarse positioning module fixes and clamps the tab through the adjustable vacuum suction head when performing tab welding, and at the same time, 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 fine positioning module collects the real-time position condition of the electrode sheet at the welding position through the image sensor when performing tab welding, and the controller adjusts the welding position of the tab 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 collected by the image sensor and performs dynamic adjustment 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 suction port 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, and the specific adjustment method is as follows: ; ; In the formula: represents the suction force of the inner metal suction pipe, represents the negative pressure pressure for adsorption, represents the suction port 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, 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.

[0009] Further, in the technical scheme of the present application, a plurality of groups of adsorption micropores are arranged on the porous adsorption platform, and the electrode sheet is adsorbed by negative pressure in the tab welding process, a buffer ring is installed at each adsorption micropore, so as to prevent damage to the electrode sheet caused by negative pressure adsorption; a pressure relief structure is further installed 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 in communication with the adsorption micropore is further arranged on one side of the pressure relief hole, and the maximum negative pressure pressure allowed by the pressure relief structure is: ; In the formula: represents the maximum negative pressure allowed, represents the gravity of the movable valve, represents the spring constant of the measuring spring, represents the safety length, the length represents the length from the bottom end of the movable valve to the negative pressure port.

[0010] Further, in the technical scheme of the present application, the controller adjusts the welding position of the tab according to the real-time position of the electrode sheet, and specifically comprises: M1, calculating the position deviation: ; In the formula: represents the position deviation of the electrode sheet at the welding position, represents the real-time position of the electrode sheet at the welding position, represents the preset position of the electrode sheet at the welding position; M2, adjusting the welding position of the tab according to the position deviation adjusting the welding position of the tab.

[0011] 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: N1, determining the position deviation : without adjustment; dynamic adjustment; In the formula: represents the allowable error; N2, dynamic adjustment, adjusting the conveying speed of the electrode sheet: ; ; In the formula: represents the adjusted conveying speed of the electrode sheet, represents the default conveying speed of the electrode sheet, represents the electrode sheet conveying time period, represents the interval between adjacent electrode sheets.

[0012] The present application also provides a soft package battery packaging positioning method, which adopts the positioning mechanism according to the above description, and specifically comprises the following steps: S1, coarse positioning: when welding the tab, the coarse positioning module is used to synchronously pre-position the tab and the electrode sheet, the adjustable vacuum suction head is used to fixedly clamp the tab, and the multi-hole adsorption platform is used to apply vacuum negative pressure to the electrode sheet. S2. Precision positioning: When welding the tab, the image sensor is used to collect the real-time position of the electrode sheet at the welding point, and the controller adjusts the welding position of the tab according to the real-time position of the electrode sheet; S3. Dynamic compensation: Obtain the real-time position of the electrode piece collected by the image sensor and make dynamic adjustments when the position deviation exceeds the limit.

[0013] Effective gain: In summary, the present invention provides a positioning mechanism and a soft-pack battery packaging positioning method. In the technical solution of the present invention, a multi-level positioning strategy of coarse positioning, fine positioning and dynamic compensation is adopted to improve the position positioning of the tabs and electrode sheets during tab welding, thereby realizing high-precision positioning in the soft-pack battery packaging. Specifically, on the one hand, the present invention adopts a suction head structure composed of an internal inner metal straw and an external elastic ring to adsorb and fix the tabs in coarse positioning, wherein the inner metal straw adsorbs the tabs more stably, and at the same time, the outer elastic ring is used to buffer the suction force of the inner metal straw, which is not easy to cause contact damage to the tabs. On the other hand, the present invention analyzes the real-time position of the electrode sheet at the welding point during tab welding, adjusts the tab welding position, and performs dynamic adjustment when the position deviation exceeds the limit, which is beneficial to high-precision positioning of the tab welding in the soft-pack battery packaging.

[0014] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. 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 these drawings without paying any creative work.

[0016] Figure 1 This is a partial structural diagram of a positioning mechanism of the present invention; Figure 2 It is a partial structural schematic diagram of the adjustable vacuum suction head of the present invention; Figure 3 It is a partial structural schematic diagram of the porous adsorption platform of the present invention; Figure 4 It is a partial structural schematic diagram of the pressure relief structure of the present invention; In the figure: A, electrode sheet; B, electrode ear; a, inner metal straw; b, outer elastic ring; c, adsorption micropore; d, pressure relief hole; e, movable valve; f, measuring spring; g, negative pressure port. DETAILED DESCRIPTION

[0017] 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 clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] The core of the embodiments of the present application is to provide a positioning mechanism and a soft package battery packaging positioning method, which improves the 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.

[0019] 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 of the structure diagram of the positioning mechanism of the present application is shown in the figure, Figure 1 In the present 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. The coarse positioning module fixes and clamps the tab B through the adjustable vacuum suction head during tab B welding, and at the same time, the multi-hole adsorption platform applies vacuum negative pressure to the electrode sheet A to realize the synchronous pre-positioning of the tab B and the electrode sheet A. The adjustable vacuum suction head is used to adjust the structure according to the different specifications of the tab B, 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. The fine positioning module collects the real-time position of the electrode sheet A at the welding position through the image sensor during tab B welding, and the controller adjusts the welding position of the tab B according to the real-time position of the electrode sheet A. The dynamic compensation module obtains the real-time position of the electrode sheet A collected by the image sensor and dynamically adjusts when the position deviation exceeds the limit.

[0020] Specifically, in the present embodiment, Figure 2 Part of the structure diagram of the adjustable vacuum suction head of the present application is shown in the figure, 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 suction port of the inner metal suction pipe a. The installation height of the outer elastic ring b can be adjusted according to different specifications of the tab B. The specific adjustment method is as follows: ; ; In the formula, represents the suction force of the inner metal suction pipe a, represents the negative pressure pressure for adsorption, The area of the suction port of the inner metal straw a, The gravity of the tab B, The elastic coefficient of the outer elastic ring b, The installation height of the outer elastic ring b, The height of the installation bottom end of the outer elastic ring b from the bottom end of the inner metal straw a.

[0021] It should be noted that in the adjustment of the installation height of the outer elastic ring b according to different specifications of the tab B, the specification refers to the adjustment according to the gravity of different tabs B, and the purpose is to balance the suction force of the outer elastic ring b on the inner metal straw a, and 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 exerted by the outer elastic ring b is adjusted, and the suction force of the outer elastic ring b on the inner metal straw a is balanced to prevent excessive suction force from causing damage to the tab B. Since the suction head with a full elastic structure will cause elastic contact between the suction head and the tab B, contact errors will occur during the welding of the tab B. Therefore, the suction head structure of the inner metal straw a and the outer elastic ring b is adopted in this embodiment, which is more stable for the tab B. At the same time, the outer elastic ring b buffers the suction force of the inner metal straw a and is not easy to cause contact damage to the tab B.

[0022] Specifically, in this embodiment, Figure 3 Part of the structure of the porous adsorption platform is shown in the figure, and a plurality of adsorption micropores c are provided on the porous adsorption platform, Figure 3 As shown, a plurality of adsorption micropores c are provided on the porous adsorption platform, and the electrode piece A is adsorbed during the welding of the tab B by negative pressure. A buffer ring is installed at each adsorption micropore c to prevent damage to the electrode piece A during negative pressure adsorption, i.e. to prevent damage to the electrode piece A adsorbed at the inner edge of the adsorption micropore c during negative pressure adsorption. The bottom end of the porous adsorption platform is also provided with a pressure relief structure, which includes a pressure relief hole d in communication with the adsorption micropore, and a movable valve e is arranged in the pressure relief hole d. 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: ; In the formula: Pmax represents the maximum negative pressure allowed, G represents the gravity of the movable valve e, K represents the elastic coefficient of the measuring spring f, L represents the safety length, L represents the length of the bottom end of the movable valve e from the negative pressure port g.

[0023] It should be noted that the pressure relief structure of the embodiment adopts a full mechanical structure combination, which is stable in structure and can generate activity in real time during 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 counterweight, the maximum negative pressure of the pressure relief structure can be adjusted.

[0024] Specifically, in the embodiment, the controller adjusts the welding position of the tab B according to the real-time position of the electrode sheet A, which specifically includes: M1, calculating the position deviation: In the formula: represents the position deviation of the electrode sheet A at the welding position, represents the real-time position of the electrode sheet A at the welding position, represents the preset position of the electrode sheet A at the welding position; M2, adjusting the welding position of the tab B according to the position deviation adjusting the welding position of the tab B, i.e. adjusting the welding position of the tab B, and the adjustment amount is .

[0025] Specifically, in the embodiment, the dynamic compensation module dynamically adjusts when the position deviation exceeds the limit, which specifically includes: N1, determining the position deviation without adjustment; dynamic adjustment; In the formula: represents the allowable error; N2, dynamic adjustment, adjusting the conveying speed of the electrode sheet A: In the formula: represents the adjusted conveying speed of the electrode sheet A, represents the default conveying speed of the electrode sheet A, represents the conveying time period of the electrode sheet A, represents the interval between adjacent electrode sheets A.

[0026] The embodiment also provides a soft package battery packaging positioning method, which adopts the positioning mechanism described above, and specifically includes the following steps: ​​​​​S1, coarse positioning: when performing tab B welding, the tab B and the electrode piece A are pre-positioned by the coarse positioning module, the tab B is fixed and clamped by the adjustable vacuum suction head, and the electrode piece A is fixed by the multi-hole adsorption platform; S2, fine positioning: when performing tab B welding, the real-time position of the electrode piece A at the welding position is collected by the image sensor, and the welding position of the tab B is adjusted according to the real-time position of the electrode piece A; S3, dynamic compensation: the real-time position of the electrode piece B collected by the image sensor is obtained, and dynamic adjustment is performed when the position deviation exceeds the limit.

[0027] 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, and 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, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A positioning mechanism, characterized in that: include: A coarse positioning module, comprising an adjustable vacuum suction head and a porous adsorption platform. During tab welding, the adjustable vacuum suction head is used to securely clamp the tab, while the porous adsorption platform simultaneously applies vacuum negative pressure to the electrode sheet to secure the tab, thereby achieving synchronous pre-positioning of the tab and the electrode sheet. The adjustable vacuum suction head is used to adjust its structure according to tabs of different specifications to balance the suction force of the adjustable vacuum suction head and the gravity of the tab, thereby preventing the adjustable vacuum suction head from damaging the tab. The precise positioning module includes an image sensor and a controller. When performing tab welding, the image sensor is used to collect the real-time position of the electrode sheet at the welding point. The controller adjusts the tab welding position according to the real-time position of the electrode sheet. The dynamic compensation module obtains the real-time position of the electrode piece collected by the image sensor and performs dynamic adjustment when the position deviation exceeds the limit.

2. A positioning mechanism according to claim 1, characterized in that: The adjustable vacuum suction head includes an inner metal suction tube and an outer elastic ring. The outer elastic ring is movably mounted at the bottom end of the inner metal suction tube at the suction port to adjust the installation height of the outer elastic ring according to the different specifications of the tabs. The specific adjustment method is as follows: ， ； Where: Expressed as the suction force of the inner metal straw, Expressed as the negative pressure for adsorption, Expressed as the suction area of ​​the inner metal straw, Expressed as the gravity of the ear, Expressed as the elastic coefficient of the outer elastic ring, Indicated as installation height, the installation height It is expressed as the height from the installation bottom end of the outer elastic ring to the suction port at the bottom end of the inner metal straw.

3. A positioning mechanism according to claim 2, characterized in that: The porous adsorption platform is provided with a plurality of adsorption micropores, which adsorb the electrode sheet by negative pressure during the tab welding process. Buffer rings are installed at the adsorption micropores to prevent damage to the electrode sheet during negative pressure adsorption. The bottom of the porous adsorption platform is also equipped with a pressure relief structure, which includes a pressure relief hole connected to the adsorption micropores, a movable valve is provided in the pressure relief hole, one end of the movable valve is connected to a measuring spring, and a negative pressure port is provided on one side of the pressure relief hole to communicate with the adsorption micropores. The maximum negative pressure allowed by the pressure relief structure is: ； Where: Expressed as the maximum permissible negative pressure, Expressed as the weight of the active valve, Expressed as the elastic constant of the measuring spring, Indicated as safe length, the length It is expressed as the length from the bottom end of the movable valve to the negative pressure port.

4. A positioning mechanism according to claim 3, characterized in that: The controller adjusts the welding position of the tab according to the real-time position of the electrode sheet, specifically including: M1. Calculate position deviation: ; Where: It is expressed as the position deviation of the electrode sheet at the welding point. Indicates the real-time position of the electrode at the welding point. Indicates the preset position of the electrode sheet at the welding location; M2, adjust the welding position of the tab, according to the position deviation Adjust the welding position of the tab.

5. A positioning mechanism according to claim 4, characterized in that: The dynamic compensation module performs dynamic adjustment when the position deviation exceeds the limit, specifically including: N1, position deviation Make a judgment: , no adjustment is required; , and make dynamic adjustments; Where: Expressed as allowable error; N2. Dynamic adjustment, adjust the conveying speed of the electrode sheet: ， ； Where: It is expressed as the adjusted electrode sheet conveying speed, Indicates the default electrode sheet conveying speed. Expressed as the electrode sheet delivery time period, Indicates the spacing between adjacent electrode sheets.

6. A soft pack battery packaging positioning method, characterized in that: The positioning mechanism according to claim 5 specifically comprises the following steps: S1. Coarse positioning: During the tab welding, the tab and electrode sheet are pre-positioned synchronously by the coarse positioning module, the tab is fixed and clamped by the adjustable vacuum suction head, and the electrode sheet is fixed by applying vacuum negative pressure through the porous adsorption platform; S2. Precision positioning: When welding the tab, the image sensor is used to collect the real-time position of the electrode sheet at the welding point, and the controller adjusts the welding position of the tab according to the real-time position of the electrode sheet; S3. Dynamic compensation: Obtain the real-time position of the electrode piece collected by the image sensor and make dynamic adjustments when the position deviation exceeds the limit.

Images