Welding pressure head, welding device and control method of welding device

Abstract

The invention provides a welding pressure head, a welding device and a control method of the welding device, and relates to the technical field of battery manufacturing. The welding pressure head comprises a pressure head body and a heating piece, the pressure head body is provided with a communicating cavity, an inlet of the communicating cavity is located in the top face of the pressure head body, an outlet of the communicating cavity is located in the bottom face of the pressure head body, and the communicating cavity is used for allowing the laser beam to penetrate through and welding a workpiece to be machined through the laser beam. The heating piece is arranged on the pressing head body. When the welding pressing head is connected with the workpiece to be machined in a matched mode, the heating piece enables the temperature of the workpiece to be machined to rise in a non-contact mode. By means of the heating piece, the workpiece is heated evenly through the thermal compensation effect in laser beam welding, the laser beam absorption rate of the workpiece to be machined is increased, and then the assembly efficiency and the assembly yield of batteries are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a welding pressure head, a welding device and a control method of the welding device. Background Art

[0002] During the battery assembly process, the tabs of the battery cell and the cover of the shell are welded by laser.

[0003] During the welding process, the laser emitter on the welding equipment emits a laser beam toward the pole ear side, and after the laser beam heats the connection area between the pole ear and the cover plate, the laser emitter emits a laser beam toward the pole ear side again to connect the pole ear and the cover plate together.

[0004] However, such a welding process will result in reduced battery assembly efficiency. Summary of the invention

[0005] The present application provides a welding pressure head, a welding device and a control method of the welding device, which can solve the problem of low assembly efficiency of batteries, thereby improving the assembly efficiency of batteries.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides a welding pressure head, comprising:

[0008] A ram body, the ram body having a connecting cavity, the inlet of the connecting cavity being located on the top surface of the ram body, the outlet of the connecting cavity being located on the bottom surface of the ram body, the connecting cavity being used for allowing a laser beam to pass through and for welding a workpiece to be processed by the laser beam;

[0009] A heating element, wherein the heating element is disposed on the pressing head body;

[0010] When the welding pressure head and the workpiece to be processed are connected in a cooperative manner, the heating element heats up the workpiece to be processed in a non-contact manner.

[0011] In some embodiments, the heating element is disposed close to the bottom surface of the press head body.

[0012] In some embodiments, the heating element is disposed outside the press head body.

[0013] In some embodiments, the pressure head body has a mounting cavity, and the mounting cavity and the connecting cavity are separately arranged along the wall thickness direction of the pressure head body; the heating element is installed in the mounting cavity.

[0014] In some embodiments, the press head body has a first part and a second part connected to each other, the first part has a first chamber, and the first chamber extends along the height direction of the press head body; the second part has a second chamber, and the second chamber extends along the height direction of the press head body;

[0015] The first part and the second part are matched to make the first chamber and the second chamber communicate with each other and form the communicating chamber.

[0016] In some embodiments, the first portion and the second portion are integrally formed.

[0017] In some embodiments, the second portion is detachably connected to the first portion.

[0018] In some embodiments, the second portion has a first surface, and the first surface forms a bottom surface of the indenter body.

[0019] In some embodiments, the heating element is disposed in the second portion.

[0020] In some embodiments, the cross-sectional area of ​​the communication cavity gradually decreases along the direction from the top surface to the bottom surface of the pressure head body.

[0021] In some embodiments, the heating element includes a temperature radiating element, and a temperature radiating end of the temperature radiating element faces the side where the bottom surface of the pressure head body is located.

[0022] In some embodiments, the heating element includes an induction coil, which is wound around the press head body; the induction coil is used for magnetic conduction with the workpiece to be processed;

[0023] The end of the induction coil is used to be electrically connected to a power source.

[0024] In some embodiments, the pressure head body has a fixing portion, and the induction coil is wound around the fixing portion.

[0025] In some embodiments, the indenter body includes an insulator.

[0026] In some embodiments, the pressure head body has an air flow channel, the air flow channel has an air flow inlet and a first air flow outlet, the air flow inlet is located on the peripheral side of the pressure head body, and the first air flow outlet is located on the inner side of the pressure head body and connected to the connecting cavity.

[0027] In some embodiments, the air flow inlet and the first air flow outlet are disposed near the bottom of the pressure head body.

[0028] In some embodiments, along the direction from the top surface to the bottom surface of the pressure head body, the height of the first air flow outlet is higher than the height of the air flow inlet.

[0029] In some embodiments, the air flow channel further has a second air flow outlet, and the second air flow outlet is located on the top surface of the pressure head body.

[0030] In some embodiments, the number of the airflow channels is at least two, and at least two of the airflow channels are located on the peripheral side of the communicating cavity.

[0031] In some embodiments, the inner side wall of the press head body has a protective layer; the protective layer covers at least a portion of the inner side wall.

[0032] In some embodiments, the welding head further includes a temperature detection component, which is disposed on the head body, with the detection end of the temperature detection component facing the bottom surface of the head body; the temperature detection component is used to obtain temperature information of the workpiece to be processed.

[0033] In some embodiments, the temperature detecting member is located in the connecting cavity.

[0034] In some embodiments, along the first direction, the extension length of the outlet of the communicating cavity is L1; along the second direction, the extension length of the outlet of the communicating cavity is L2; ​​L1 and L2 satisfy: L1≥L2;

[0035] In a plane perpendicular to the height direction of the pressure head body, the first direction and the second direction intersect.

[0036] In some embodiments, L1 satisfies: 10 mm ≤ L1 ≤ 300 mm;

[0037] And / or, L2 satisfies: 3mm≤L2≤100mm.

[0038] In a second aspect, the present application provides a welding device, comprising: a welding mechanism and the welding pressure head provided in the first aspect. The welding pressure head is connected to the welding mechanism.

[0039] In some embodiments, the welding mechanism includes: a laser emitting element, and a laser emitting end of the laser emitting element and a communicating cavity of the welding pressure head are arranged opposite to each other.

[0040] In some embodiments, the welding device further comprises an air supply assembly, wherein an air supply port of the air supply assembly is in communication with an air flow inlet of the welding pressure head.

[0041] In some embodiments, the welding mechanism includes a dust removal assembly, and a dust removal port of the dust removal assembly is connected to the inlet of the communication cavity of the welding pressure head.

[0042] In a third aspect, the present application provides a control method for a welding device, which is applied to the welding device provided in the second aspect; the method comprises:

[0043] Acquire position information of the workpiece to be processed between the welding heads in the welding device, control the heating element of the welding head to start according to the position information and preset position information to heat the workpiece to be processed, and acquire temperature information of the workpiece to be processed;

[0044] According to the temperature information and the preset temperature information, the heating element is controlled to stop, and the laser emitting element of the welding device is controlled to emit a laser beam to weld the workpiece to be processed.

[0045] In some embodiments, according to the position information and the preset position information, controlling the heating element of the welding head to start, further includes:

[0046] The gas supply component of the welding device is controlled to start so as to supply a preset gas to the welding pressure head.

[0047] In some embodiments, according to the position information and the preset position information, controlling the heating element of the welding head to start, further includes:

[0048] The dust removal component of the welding device is controlled to start, so as to form a negative pressure in the communication cavity of the welding pressure head.

[0049] The welding ram, welding device and control method of the welding device provided in the present application relate to the field of battery manufacturing technology. The welding ram includes a ram body and a heating element. The ram body has a connecting cavity. The entrance of the connecting cavity is located on the top surface of the ram body, and the exit of the connecting cavity is located on the bottom surface of the ram body. The connecting cavity is used for the laser beam to pass through and weld the workpiece to be processed by the laser beam. The heating element is arranged on the ram body. When the welding ram and the workpiece to be processed are connected in a cooperative manner, the heating element heats the workpiece to be processed in a non-contact manner. Through such a heating element, the workpiece is formed to have a thermal compensation effect in laser beam welding, so that the workpiece to be processed is heated evenly, and the absorption rate of the laser beam by the workpiece to be processed is improved, thereby improving the assembly efficiency and assembly yield of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 A schematic diagram of a first welding pressure head provided in an embodiment of the present application;

[0052] Figure 2 A top view of a first welding pressure head provided in an embodiment of the present application;

[0053] Figure 3 for Figure 2 AA section view;

[0054] Figure 4 A left side view of a first welding pressure head provided in an embodiment of the present application;

[0055] Figure 5 A bottom view of a first welding pressure head provided in an embodiment of the present application;

[0056] Figure 6 A schematic diagram of a second welding pressure head provided in an embodiment of the present application;

[0057] Figure 7 A top view of a second welding head provided in an embodiment of the present application;

[0058] Figure 8 for Figure 7 BB section view;

[0059] Fig. 9 A left view of a second welding pressure head provided in an embodiment of the present application;

[0060] Fig.10 A bottom view of the second welding ram provided in an embodiment of the present application.

[0061] Description of reference numerals:

[0062] 100-welding pressure head;

[0063] 110-Indenter body;

[0064] 111-communication cavity; 1111-inlet; 1112-outlet;

[0065] 112-installation cavity;

[0066] 113-first part; 1131-first chamber;

[0067] 114-second part; 1141-second chamber;

[0068] 115-fixed part;

[0069] 116 - air flow channel; 1161 - air flow inlet; 1162 - first air flow outlet; 1163 - second air flow outlet;

[0070] 117- temperature detection element;

[0071] 120-heating element;

[0072] 121-Induction coil. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than 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. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0074] First, see Figures 1 to 3 , Figures 6 to 8 The embodiment of the present application provides a welding ram 100, including a ram body 110, the ram body 110 has a connecting cavity 111, the inlet 1111 of the connecting cavity 111 is located on the top surface of the ram body 110, and the outlet 1112 of the connecting cavity 111 is located on the bottom surface of the ram body 110, and the connecting cavity 111 is used for allowing a laser beam to pass through and weld a workpiece to be processed by the laser beam.

[0075] It can be understood that during the use of the welding ram 100, the bottom surface of the ram body 110 faces the workpiece to be processed and abuts against the workpiece to be processed, so that pressure is applied to the workpiece to be processed through the ram body 110, so that the workpiece to be processed remains stable during laser beam welding, thereby improving the welding effect.

[0076] It should be noted that the workpiece to be processed in the embodiment of the present application can be the pole ear of the battery cell and the cover plate of the shell, or the busbar and the battery pole, etc., which can be any workpiece that can be welded by laser beam, and the embodiment of the present application does not limit this.

[0077] When the laser beam is welding the workpiece to be processed, the absorption rate of the workpiece to be processed to the laser beam increases as the temperature of the workpiece to be processed increases. Therefore, in some embodiments, the temperature of the workpiece to be processed can be increased by passing the laser beam through the connecting cavity 111 and emitting from the outlet 1112 of the connecting cavity 111, so as to subsequently pass a high-energy laser beam through the connecting cavity 111 and emit from the workpiece to be processed to complete the laser beam welding operation.

[0078] However, in such a welding process, it is necessary to emit the laser beam twice, and the laser beam used to heat the workpiece to be processed is emitted from a limited area on the workpiece to be processed. In order to ensure that the temperature distribution of the workpiece to be processed is uniform, it is necessary to split the processing area of ​​the workpiece to be processed, and emit the laser beam in sequence to the corresponding processing area on the workpiece to be processed. In this way, the heating time of the workpiece to be processed is relatively long, resulting in a long welding process, an increase in the welding process beat, and a decrease in the battery assembly efficiency. In addition, the laser beam is emitted in sequence in the processing area of ​​the workpiece to be processed. In this process, there is a situation where the temperature distribution of the workpiece to be processed after being heated by the laser beam is uneven, which further leads to poor welding quality of the workpiece after laser beam welding and reduced battery yield.

[0079] In order to solve such a problem, the welding head 100 in the embodiment of the present application further includes a heating element 120, which is disposed on the head body 110. When the welding head 100 is connected to the workpiece to be processed, the heating element 120 heats the workpiece to be processed in a non-contact manner.

[0080] In this way, by arranging a heating element 120 on the pressure head body 110 and heating the workpiece to be processed in a non-contact manner through the heating element 120, preheating in the laser beam welding process and thermal compensation for the workpiece welding are formed. Furthermore, the non-contact heating method can make the workpiece to be processed heated evenly, which helps to promote the absorption of the laser beam by the workpiece to be processed, thereby increasing the welding efficiency of the laser beam, thereby improving the assembly efficiency of the battery, and can also improve the welding quality, and further improve the assembly yield of the battery.

[0081] See also Figure 1 and Figure 8Optionally, the heating element 120 is disposed close to the bottom surface of the ram body 110. That is, along the height direction of the ram body 110, the distance between the heating element 120 and the bottom surface of the ram body 110 is smaller than the distance between the heating element 120 and the top surface of the ram body 110. In this way, the heating element 120 is disposed close to the bottom surface of the ram body 110, and when the ram body 110 and the workpiece to be processed are in contact, the heating element 120 is close to the workpiece to be processed, ensuring that the workpiece to be processed can be heated up quickly, which helps to heat up the workpiece to be processed through laser beam welding, thereby improving the assembly efficiency of the battery and improving the assembly yield of the battery.

[0082] See also Figure 1 , Figure 3 and Figure 4 As an optional embodiment, the heating element 120 is disposed outside the pressure head body 110. That is, the heating element 120 can be disposed on the peripheral outer wall of the pressure head body 110, so that the connection between the heating element 120 and the pressure head body 110 is convenient, and the assembly efficiency of the welding pressure head 100 is improved. Furthermore, the disassembly and maintenance between the heating element 120 and the pressure head body 110 are convenient, and the maintenance difficulty and maintenance cost of the welding pressure head 100 are reduced.

[0083] During the process of laser beam welding the workpiece to be processed, welding slag will be generated, and the welding slag is easy to splash onto the cavity wall of the connecting cavity 111. By setting the heating element 120 outside the pressure head body 110, a protective effect is formed on the heating element 120, which can prevent the welding slag from splashing onto the heating element 120, thereby extending the service life of the heating element 120 and reducing the maintenance cost of the heating element 120.

[0084] It should be noted that the heating element 120 in the embodiment of the present application can be located outside the press head body 110 and close to the bottom surface of the press head body 110. There is no requirement for the specific position of the heating element 120 on the peripheral outer wall of the press head body 110.

[0085] Combination Figure 6 , Figure 7 and Figure 8 Optionally, the pressure head body 110 has a mounting cavity 112 , and the mounting cavity 112 and the connecting cavity 111 are separately arranged along the wall thickness direction of the pressure head body 110 ; the heating element 120 is installed in the mounting cavity 112 .

[0086] It should be noted that the opening of the installation cavity 112 can be toward the bottom surface of the ram body 110 so that the heating element 120 can be installed in the installation cavity 112. The installation cavity 112 in the embodiment of the present application can be an annular cavity, and the annular cavity is arranged around the outer periphery of the connecting cavity 111 along the thickness direction of the ram body 110. Of course, the installation cavity 112 can also be a cylindrical cavity, etc., and the embodiment of the present application does not require the shape of the installation cavity 112. Furthermore, the number of the installation cavities 112 in the embodiment of the present application can be one or more, and there is no limitation on this.

[0087] It is not difficult to understand that the installation cavity 112 and the connecting cavity 111 are separately arranged and not connected to each other, and the heating element 120 is arranged in the installation cavity 112, so that the heating element 120 can be isolated from the connecting cavity 111 through the installation cavity 112. The installation cavity 112 forms the installation and protection function of the heating element 120, which can prevent welding slag from splashing onto the heating element 120, thereby extending the service life of the heating element 120 and reducing the maintenance cost of the heating element 120.

[0088] See also Figures 6 to 9 In some embodiments, the press head body 110 has a first portion 113 and a second portion 114, the first portion 113 has a first chamber 1131, and the first chamber 1131 extends along the height direction of the press head body 110; the second portion 114 has a second chamber 1141, and the second chamber 1141 extends along the height direction of the press head body 110; the first portion 113 and the second portion 114 are matched to connect the first chamber 1131 and the second chamber 1141 to form a connecting chamber 111.

[0089] It is not difficult to understand that the first chamber 1131 penetrates the first part 113 along the height direction of the pressure head body 110, and the second chamber 1141 penetrates the second part 114 along the height direction of the pressure head body 110. When the first part 113 and the second part 114 are matched, the first chamber 1131 and the second chamber 1141 are connected to form a connecting chamber 111, that is, the connecting chamber 111 penetrates the pressure head body 110 along the height direction of the pressure head body 110, so that the exit path of the laser beam is formed through such a connecting chamber 111. In the process of the laser beam passing through the connecting chamber 111, there is a situation that the laser beam is reflected and scattered by the cavity wall of the connecting chamber 111, resulting in the problem of energy loss of the laser beam.

[0090] To solve this problem, see Figure 3 and Figure 8 In an optional embodiment of the present application, the cross-sectional area of ​​the connecting cavity 111 gradually decreases along the direction from the top surface to the bottom surface of the pressure head body 110.

[0091] It can be understood that the cross-sectional area of ​​the connecting cavity 111 on the side close to the top surface of the ram body 110 is greater than the cross-sectional area of ​​the connecting cavity 111 on the side close to the bottom surface of the ram body 110, and in the direction from the top surface to the bottom surface of the ram body 110, since the cross-sectional area of ​​the connecting cavity 111 gradually decreases, the cross-sectional profile of the connecting cavity 111 in this direction is horn-shaped. In this way, through such a connecting cavity 111, the laser beam can be focused, so that the laser beam gradually concentrates when passing through the connecting cavity 111, which helps to reduce the reflection loss and heat dissipation loss of the laser beam, thereby improving the energy density of the laser beam, further enhancing the welding efficiency and effect of the laser beam on the workpiece to be processed, so that the assembly efficiency and assembly yield of the battery are increased.

[0092] There are many ways to align the first part 113 and the second part 114. As one optional embodiment, the first part 113 and the second part 114 are integrally formed. For example, injection molding, dry pressing, isostatic pressing and other molding processes are not required in the present embodiment. In this way, the manufacturing efficiency of the pressure head body 110 is improved by such an integral molding process.

[0093] As an optional embodiment, the second part 114 is detachably connected to the first part 113. This facilitates the connection and disassembly between the first part 113 and the second part 114, reduces the maintenance difficulty of the pressure head body 110, and thus reduces the maintenance cost of the welding pressure head 100.

[0094] Exemplarily, the second part 114 and the first part 113 may be detachably connected by a snap-fitting manner or by a plug-in manner, which is not limited in the embodiments of the present application.

[0095] It should be noted that the inlet 1111 of the communication cavity 111 may be located on the surface of the first part 113 away from the second part 114, and correspondingly, the outlet 1112 of the communication cavity 111 is located on the surface of the second part 114 away from the first part 113. Alternatively, the inlet 1111 of the communication cavity 111 may be located on the surface of the second part 114 away from the first part 113, and correspondingly, the outlet 1112 of the communication cavity 111 is located on the surface of the first part 113 away from the second part 114. The embodiment of the present application is not limited to this.

[0096] It should also be noted that the heating element 120 can be disposed in the first portion 113 or in the second portion 114 , and there is no limitation to this.

[0097] As one of the optional embodiments, the second portion 114 has a first surface, and the first surface forms the bottom surface of the pressure head body 110. It is not difficult to understand that the outlet 1112 of the communication cavity 111 is located on the first surface, and the inlet 1111 of the communication cavity 111 is located on the surface of the first portion 113 away from the second portion 114 along the height direction of the pressure head body 110. In addition, along the direction from the top surface to the bottom surface of the pressure head body 110, the cross-sectional area of ​​the second chamber 1141 is smaller than the cross-sectional area of ​​the first chamber 1131, and the cross-sectional area of ​​the first chamber 1131 gradually decreases, and the cross-sectional area of ​​the second chamber 1141 gradually decreases.

[0098] In combination with the above-mentioned embodiment, the first surface abuts against the workpiece to be processed, and as an optional embodiment, the heating element 120 is disposed on the second portion 114. It is not difficult to understand that the heating element 120 is disposed on the second portion 114, and the distance between the heating element 120 and the workpiece to be processed is reduced, so that the energy loss of the heating element 120 in heating the workpiece to be processed in a non-contact manner can be reduced, and the absorption rate of the workpiece to be processed to the laser beam can be increased, thereby improving the welding efficiency and welding effect, and further improving the assembly efficiency and assembly yield of the battery.

[0099] For example, see Figure 8 The installation cavity 112 may be located in the second portion 114, and the heating element 120 may be located in the installation cavity 112, that is, the heating element 120 is disposed on the second portion 114. Of course, the heating element 120 may also be disposed on the circumferential outer side wall of the second portion 114, which is not required in the embodiment of the present application.

[0100] It is not difficult to understand that the heating element 120 increases the temperature of the workpiece to be processed in a non-contact manner, wherein there are many heating elements 120 that achieve heating in a non-contact manner. As an optional embodiment, the heating element 120 includes a temperature radiating element, and the temperature radiating end of the temperature radiating element faces the side where the bottom surface of the press head body 110 is located.

[0101] Exemplarily, the temperature radiation element includes an infrared heater, a ceramic radiation element, etc. The temperature radiation end of the temperature radiation element is toward the side where the bottom surface of the pressure head body 110 is located, so as to radiate heat to the workpiece to be processed, thereby heating the workpiece to be processed, and in the process of laser beam welding, it can increase the absorption rate of the workpiece to be processed to the laser beam, thereby improving the welding efficiency and further improving the assembly efficiency of the battery. Furthermore, since the workpiece to be processed is heated evenly in the temperature radiation field, the welding quality of the workpiece to be processed by laser beam welding can be ensured, thereby improving the assembly effect and stability of the battery.

[0102] See also Figure 1 , Figure 4 , Figure 6 and Figure 8Optionally, the heating element 120 includes an induction coil 121, which is wound around the pressure head body 110; the induction coil 121 is used for magnetic conduction with the workpiece to be processed; and the end of the induction coil 121 is used for electrical connection with a power source.

[0103] In this way, a magnetic field is generated by the setting of the induction coil 121, and eddy currents are formed inside the workpiece to be processed, so as to achieve rapid heating of the workpiece to be processed in the magnetic field, thereby speeding up the assembly rhythm of the battery and improving the assembly efficiency of the battery. The heating area to be processed can also be increased, so that the workpiece to be processed is heated evenly, so as to efficiently absorb the laser beam, further improve the welding rhythm of the workpiece, and improve the assembly efficiency and assembly yield of the battery.

[0104] For example, see Figure 1 and Figure 8 The induction coil 121 may be disposed on the outside of the pressure head body 110 , or in the mounting cavity 112 of the pressure head body 110 .

[0105] In some embodiments, the induction coil 121 may be disposed in the second portion 114, wherein the second portion 114 and the first portion 113 are detachably connected. In this embodiment, the induction coil 121 may be disposed outside the second portion 114 or in the mounting cavity 112 of the second portion 114, and this is not limited.

[0106] See also Figure 3 , Figure 4 , Figure 8 In some embodiments, the pressure head body 110 has a fixing portion 115, and the induction coil 121 is wound around the fixing portion 115. In this way, the induction coil 121 is stably connected to the pressure head body 110 through the fixing portion 115, thereby improving the connection stability between the induction coil 121 and the pressure head body 110.

[0107] For example, the fixing portion 115 may be a slot, a groove, a bezel, a clamp, etc., which is not limited in the present embodiment. Figure 3 and Figure 4 When the induction coil 121 is disposed outside the pressure head body 110, the fixing portion 115 may be located on the circumferential outer side wall of the pressure head body 110. Figure 8 When the induction coil 121 is disposed in the installation cavity 112 , the fixing portion 115 may be located in the installation cavity 112 .

[0108] The power supply in the embodiment of the present application may be an AC power supply, or a combination of a DC power supply and an inverter.

[0109] The induction coil 121 generates a magnetic field after being energized. The ram body 110 in the embodiment of the present application includes an insulating member to prevent the ram body 110 from generating eddy currents under the action of the magnetic field, thereby preventing the components on the ram body 110 from heating up, etc., and further ensuring the safety of the welding ram 100.

[0110] Exemplarily, the insulating member includes a graphite member, a ceramic member, etc., and no specific requirement is made thereto.

[0111] In the embodiment of the present application, the laser beam passes through the connecting cavity 111 and welds with the workpiece to be processed at the outlet 1112. During the welding process, there is a problem of welding slag splashing, and the splashing direction and angle of the welding slag cannot be predicted. The welding slag may splash onto the cavity wall of the connecting cavity 111. With the long-term use of the welding pressure head 100, the welding slag accumulates on the cavity wall of the connecting cavity 111, which will block the passage of the laser beam in the connecting cavity 111, causing energy loss of the laser beam, so that the assembly efficiency and assembly effect of the battery are deteriorated. Furthermore, the welding slag accumulated on the cavity wall of the connecting cavity 111 is not easy to clean, and the welding pressure head 100 needs to be constantly replaced, which increases the production cost of the battery. In addition, the welding slag is also easy to remain on the workpiece or other parts of the battery, resulting in the problem of internal short circuit and thermal runaway of the battery during use, resulting in poor yield and safety of the battery.

[0112] To solve the above problems, see Figure 3 and Figure 8 In the embodiment of the present application, the pressure head body 110 has an air flow channel 116, and the air flow channel 116 has an air flow inlet 1161 and a first air flow outlet 1162. The air flow inlet 1161 is located on the peripheral side of the pressure head body 110, and the first air flow outlet 1162 is located on the inner side of the pressure head body 110 and connected to the connecting cavity 111.

[0113] It is not difficult to understand that the airflow channel 116 is connected to the connecting cavity 111 through the first airflow outlet 1162. After the gas enters the airflow channel 116 through the airflow inlet 1161, it enters the connecting cavity 111 through the first airflow outlet 1162, and then is discharged through the outlet 1112 of the connecting cavity 111. During the welding process, the splashed welding slag can be taken out of the connecting cavity 111 by the airflow, so that the welding slag can be prevented from accumulating on the cavity wall of the connecting cavity 111, thereby solving the problem of energy loss of the laser beam caused by the accumulation of welding slag on the cavity wall of the connecting cavity 111, thereby improving the assembly efficiency and assembly effect of the battery, and reducing the maintenance cost of the welding pressure head 100, and extending the service life of the welding pressure head 100, further reducing the production cost of the battery. With the discharge of welding slag under the action of airflow, it is possible to prevent the welding slag from remaining on the components of the battery, thereby reducing the probability of internal short circuit and thermal runaway of the battery, so that the yield and safety of the battery are improved.

[0114] It is not difficult to understand that the heating element 120 is disposed on the ram body 110. In the process of heating the workpiece to be processed by the heating element 120, the ram body 110 will also heat up. Furthermore, in the process of the laser beam passing through the connecting cavity, the inner wall of the ram body 110 will inevitably absorb a part of the energy of the laser beam, which will also cause the ram body 110 to heat up. It can be understood that as the temperature of the ram body 110 increases, the absorption rate of the laser beam by the ram body 110 will also increase, and the reduction of the energy of the laser beam used for welding will lead to the deterioration of the welding effect and welding efficiency of the workpiece to be processed.

[0115] In order to solve such a problem, in the embodiment of the present application, the air flow channel 116 further has a second air flow outlet 1163 , and the second air flow outlet 1163 is located on the top surface of the pressure head body 110 .

[0116] In this way, after the gas is introduced into the air flow channel, part of the gas enters the connecting cavity 111 through the first air flow outlet 1162 to improve the welding quality and discharge the welding slag in the connecting cavity 111. Part of the gas is discharged from the air flow channel 116 through the second air flow outlet 1163. In the air flow channel 116, the gas and the pressure head body 110 undergo heat exchange to reduce the temperature of the pressure head body 110, thereby achieving cooling and protection of the pressure head body 110, reducing the probability of deformation of the pressure head body 110 due to temperature rise, and further ensuring the structural reliability and stability of the welding pressure head 100. Furthermore, the absorption rate of the laser beam by the pressure head body 110 can be reduced, so that the energy of the laser beam is concentrated on welding the workpiece to be processed, so that the welding efficiency and welding effect are improved, thereby improving the assembly efficiency and assembly yield of the battery.

[0117] In addition, during the welding process, the gas enters the air flow channel 116 through the air flow inlet 1161 and can also be discharged through the second air flow outlet 1163, which can avoid the problem of poor air flow caused by blockage of the first air flow outlet 1162 and damage to the welding head 100, thereby improving the service life of the welding head 100 and ensuring the stability and safety of the battery during assembly.

[0118] It should be noted that in the embodiment of the present application, the second air flow outlet 1163 is arranged at the top of the pressure head body 110, which can extend the flow path and duration of the gas in the air flow channel 116, so that the gas can fully contact the pressure head body 110 and exchange heat, so as to improve the heat utilization rate of the gas and reduce the welding energy consumption during the battery assembly process, thereby reducing the production cost of the battery.

[0119] In some embodiments, the airflow inlet 1161 and the first airflow outlet 1162 are arranged near the bottom of the ram body 110. It is not difficult to understand that the first airflow outlet 1162 is close to the bottom of the ram body 110, and the airflow enters the airflow channel 116 through the airflow inlet 1161, and enters the bottom of the connecting cavity 111 through the first airflow outlet 1162. When the welding ram 100 and the workpiece to be processed cooperate, the airflow forms an air curtain at the outlet 1112 of the connecting cavity 111, that is, above the workpiece to be processed, to isolate oxygen and improve welding quality.

[0120] See also Figure 3 and Figure 8 Optionally, along the direction from the top surface to the bottom surface of the pressure head body 110, the height of the first airflow outlet 1162 is higher than the height of the airflow inlet 1161. In this way, the airflow enters from a low position and is discharged from a high position, naturally forming an ascending unidirectional airflow, avoiding the generation of airflow vortex in the connecting cavity 111, so as to improve the discharge efficiency and discharge effect of welding slag.

[0121] See also Figure 3 and Figure 8 Optionally, the number of the air flow channels 116 is at least two, and at least two air flow channels 116 are located on the peripheral side of the connecting cavity 111 .

[0122] Exemplarily, the number of the airflow channels 116 may be two, three or more, and the embodiment of the present application does not limit the number of the airflow channels 116. The provision of multiple airflow channels 116 can ensure that when the first airflow outlets 1162 of some airflow channels 116 are blocked, gas can still be introduced into the communication cavity 111 to improve the stability of the welding slag discharge of the welding head 100.

[0123] It should be noted that in the embodiment of the present application, nitrogen, helium, carbon dioxide, etc. can be introduced into the air flow channel 116, and the embodiment of the present application does not limit this.

[0124] During the use of the welding pressure head 100 , although the welding slag can be discharged through the setting of the air flow channel 116 , there is still a situation where the welding slag splashes and accumulates on the cavity wall of the connecting cavity 111 .

[0125] In order to solve such a problem, the inner side wall of the pressure head body 110 in the embodiment of the present application has a protective layer; the protective layer covers at least part of the inner side wall. In this way, by setting the protective layer on the inner side wall of the pressure head body 110, a protective effect is formed on the cavity wall of the connecting cavity 111, so that welding slag can be cleaned during maintenance of the welding pressure head 100, the loss of the welding pressure head 100 can be reduced, and the service life of the welding pressure head 100 can be extended.

[0126] Exemplarily, the protective layer may be a diamond-like carbon layer (DLC), a polymer composite layer, etc., and the embodiments of the present application do not make specific requirements for this.

[0127] See also Figure 3 and Figure 8 In some embodiments, the welding ram 100 further includes a temperature detection member 117, which is disposed on the ram body 110, and a detection end of the temperature detection member 117 faces the bottom surface of the ram body 110; the temperature detection member 117 is used to obtain temperature information of a workpiece to be processed.

[0128] The embodiment of the present application can detect the temperature information of the workpiece to be processed under the action of the heating element 120 by setting the temperature detection element 117, so as to control the temperature of the workpiece to be processed and the emission time of the laser beam, improve the welding processing rhythm, and further improve the assembly efficiency and assembly effect of the battery.

[0129] Exemplarily, the temperature detection component 117 includes a temperature sensor, a temperature coupling component, and the like.

[0130] See also Figure 3 and Figure 8 Optionally, the temperature detection member 117 is located in the communication cavity 111. In this way, the temperature detection member 117 obtains the temperature information of the workpiece to be processed at the outlet 1112 of the communication cavity 111, so as to increase the accuracy of the temperature information of the workpiece to be processed obtained by the temperature detection member 117.

[0131] The first direction and the second direction intersect in a plane perpendicular to the height direction of the pressure head body 110. The first direction may be the length direction of the pressure head body 110, and the second direction may be the width direction of the pressure head body 110.

[0132] See also Figure 5 and Fig.10 Optionally, along the first direction, the extension length of the outlet 1112 of the connecting cavity 111 is L1; along the second direction, the extension length of the outlet 1112 of the connecting cavity 111 is L2; ​​L1 and L2 satisfy: L1≥L2.

[0133] Exemplarily, L1 satisfies: 10 mm ≤ L1 ≤ 300 mm. L1 can be: 10 mm, 30 mm, 50 mm, 80 mm, 100 mm, 200 mm, 300 mm, etc., and no specific requirements are made for this.

[0134] Exemplarily, L2 satisfies: 3mm≤L2≤100mm. L2 can be: 3mm, 10mm, 20mm, 50mm, 70mm, 100mm, etc., and no specific requirements are made.

[0135] In a second aspect, an embodiment of the present application may also provide a welding device, comprising: a welding mechanism and the welding pressure head 100 provided in the first aspect, wherein the welding pressure head 100 is connected to the welding mechanism.

[0136] In some embodiments, the welding mechanism can drive the welding head 100 to move relative to the workpiece to be processed, so as to adjust the relative position between the welding head 100 and the workpiece to be processed.

[0137] Optionally, the welding mechanism includes: a laser emitting element, and the laser emitting end of the laser emitting element is arranged relative to the connecting cavity 111 of the welding ram 100. In this way, the welding mechanism and the welding ram 100 are connected once, and the laser beam is emitted by the laser emitting element of the welding mechanism to achieve welding of the workpiece to be processed.

[0138] In some embodiments, the welding device further includes a gas supply assembly, and the gas supply port of the gas supply assembly is connected to the air flow inlet 1161 of the welding pressure head 100. In this way, the protective gas is supplied to the air flow channel 116 and the connecting cavity 111 through the gas supply assembly, so that the residual and accumulation of welding slag on the pressure head body 110 can be reduced through the flow of the protective gas.

[0139] In some embodiments, the welding mechanism includes a dust removal component, and the dust removal port of the dust removal component is connected to the inlet 1111 of the communication cavity 111. The dust removal component can generate negative pressure in the communication cavity 111, and during the welding process, ensure the stable contact between the workpiece and the bottom surface of the pressure head body 110, and also assist the flow of the shielding gas, thereby improving the discharge efficiency and discharge effect of the welding slag.

[0140] In a third aspect, an embodiment of the present application provides a control method for a welding device, which is applied to the welding device provided in the second aspect; the method comprises:

[0141] The position information of the workpiece to be processed between the welding heads 100 in the welding device is obtained, and according to the position information and preset position information, the heating element 120 of the welding head 100 is controlled to start to heat the workpiece to be processed, and the temperature information of the workpiece to be processed is obtained.

[0142] According to the temperature information and the preset temperature information, the heating element 120 is controlled to stop, and the laser emitting element of the welding device is controlled to emit a laser beam to weld the workpiece to be processed.

[0143] It can be understood that, through the control of the welding device, when the workpiece to be processed and the welding head 100 are located at the preset position, the heating element 120 on the welding head 100 heats the workpiece to be processed. And the temperature information of the workpiece to be processed is obtained through the temperature detection element 117 on the welding head 100. When the temperature information of the workpiece to be processed reaches the preset temperature information, the heating element 120 stops, and the laser emitting element emits a laser beam to the workpiece to be processed to weld the workpiece. In this process, the workpiece to be processed is preheated by the heating element 120 to help improve the absorption rate of the workpiece to be processed to the laser beam, thereby improving the processing rhythm of the welding process and further improving the welding efficiency. Furthermore, the heating element 120 heats the workpiece to be processed in a non-contact manner, which can make the temperature distribution of the workpiece uniform, help improve the welding quality, and thus ensure the assembly yield rate of the battery.

[0144] It should be noted that the preset position in the embodiment of the present application is the position where the bottom surface of the press head body 110 abuts against the workpiece to be processed.

[0145] In some embodiments, according to the position information and the preset position information, the heating element 120 of the welding head 100 is controlled to start, and the method further includes: controlling the gas supply component of the welding device to start, so as to supply the preset gas to the welding head 100. In this way, by supplying the preset gas to the welding head 100 through the gas supply component before welding, the oxygen in the connecting cavity 111 can be removed, so that the oxygen content of the weld after welding is reduced, the welding quality is ensured, and impurities such as dust in the connecting cavity 111 can also be removed.

[0146] It should be noted that the preset gas in this embodiment is the protective gas mentioned in the above-mentioned embodiment, as well as the gas introduced into the gas flow channel 116, such as nitrogen, argon, carbon dioxide, etc.

[0147] In some embodiments, according to the position information and the preset position information, the heating element 120 of the welding head 100 is controlled to start, and the method further includes: controlling the dust removal component of the welding device to start, so as to form a negative pressure in the communication cavity 111. In this way, the impurities in the communication cavity 111 are discharged by starting the dust removal component before welding, and the spattered welding slag is discharged during the welding process, so as to improve the welding quality of the workpiece after welding, and at the same time improve the assembly effect of the battery.

[0148] It should be noted that after the laser beam operation is completed, the welding head 100 and the workpiece are separated from the abutment, and the gas supply component and the dust removal component can continue to work until the workpiece is separated from the workbench of the welding device.

[0149] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0150] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0151] It should be easily understood that the terms “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” means not only “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0152] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A welding pressure head, characterized in that: include: A ram body (110), the ram body (110) having a connecting cavity (111), an inlet (1111) of the connecting cavity (111) being located on the top surface of the ram body (110), an outlet (1112) of the connecting cavity (111) being located on the bottom surface of the ram body (110), the connecting cavity (111) being used for allowing a laser beam to pass through, and for welding a workpiece to be processed by the laser beam; A heating element (120), wherein the heating element (120) is disposed on the pressure head body (110); When the welding pressure head (100) and the workpiece to be processed are connected in a cooperative manner, the heating element (120) heats the workpiece to be processed in a non-contact manner.

2. The welding pressure head according to claim 1, characterized in that: The heating element (120) is arranged close to the bottom surface of the pressure head body (110).

3. The welding pressure head according to claim 2, characterized in that: The heating element (120) is arranged outside the pressure head body (110).

4. The welding pressure head according to claim 2, characterized in that: The pressure head body (110) has a mounting cavity (112), and along the wall thickness direction of the pressure head body (110), the mounting cavity (112) and the connecting cavity (111) are separately arranged; the heating element (120) is installed in the mounting cavity (112).

5. The welding pressure head according to any one of claims 1 to 4, characterized in that: The pressure head body (110) comprises a first portion (113) and a second portion (114); the first portion (113) comprises a first chamber (1131), and the first chamber (1131) extends along the height direction of the pressure head body (110); the second portion (114) comprises a second chamber (1141), and the second chamber (1141) extends along the height direction of the pressure head body (110); The first part (113) and the second part (114) are matched to each other so that the first chamber (1131) and the second chamber (1141) are connected to form the connecting chamber (111).

6. The welding pressure head according to claim 5, characterized in that: The first part (113) and the second part (114) are integrally formed.

7. The welding pressure head according to claim 5, characterized in that: The second part (114) is detachably connected to the first part (113).

8. The welding pressure head according to claim 5, characterized in that: The second portion (114) has a first surface, and the first surface forms the bottom surface of the press head body (110).

9. The welding pressure head according to claim 8, characterized in that: The heating element (120) is disposed on the second portion (114).

10. The welding pressure head according to claim 5, characterized in that: Along the direction from the top surface to the bottom surface of the pressure head body (110), the cross-sectional area of ​​the communication cavity (111) gradually decreases.

11. The welding pressure head according to any one of claims 1 to 4, characterized in that: The heating element (120) comprises a temperature radiation element, wherein the temperature radiation end of the temperature radiation element faces the side where the bottom surface of the pressure head body (110) is located.

12. The welding pressure head according to any one of claims 1 to 4, characterized in that: The heating element (120) comprises an induction coil (121), and the induction coil (121) is wound around the pressure head body (110); the induction coil (121) is used for magnetic conduction with the workpiece to be processed; The end of the induction coil (121) is used for being electrically connected to a power source.

13. The welding pressure head according to claim 12, characterized in that: The pressure head body (110) has a fixing portion (115), and the induction coil (121) is wound around the fixing portion (115).

14. The welding pressure head according to claim 12, characterized in that: The pressure head body (110) comprises an insulating member.

15. The welding pressure head according to any one of claims 1 to 4, characterized in that: The pressure head body (110) has an air flow channel (116), and the air flow channel (116) has an air flow inlet (1161) and a first air flow outlet (1162). The air flow inlet (1161) is located on the peripheral side of the pressure head body (110), and the first air flow outlet (1162) is located on the inner side of the pressure head body (110) and is connected to the connecting cavity (111).

16. The welding pressure head according to claim 15, characterized in that: The air flow inlet (1161) and the first air flow outlet (1162) are arranged close to the bottom of the pressure head body (110).

17. The welding pressure head according to claim 16, characterized in that: Along the direction from the top surface to the bottom surface of the pressure head body (110), the height of the first airflow outlet (1162) is higher than the height of the airflow inlet (1161).

18. The welding pressure head according to claim 15, characterized in that: The air flow channel (116) further has a second air flow outlet (1163), and the second air flow outlet (1163) is located on the top surface of the pressure head body (110).

19. The welding pressure head according to claim 15, characterized in that: The number of the airflow channels (116) is at least two, and at least two of the airflow channels (116) are located on the peripheral side of the connecting cavity (111).

20. The welding pressure head according to any one of claims 1 to 4, characterized in that: The inner side wall of the pressure head body (110) has a protective layer; the protective layer covers at least a portion of the inner side wall.

21. The welding pressure head according to any one of claims 1 to 4, characterized in that: It also includes a temperature detection component (117), which is arranged on the pressure head body (110), and the detection end of the temperature detection component (117) faces the side where the bottom surface of the pressure head body (110) is located; the temperature detection component (117) is used to obtain temperature information of the workpiece to be processed.

22. The welding pressure head according to claim 21, characterized in that The temperature detection component (117) is located in the communication cavity (111).

23. The welding pressure head according to any one of claims 1 to 4, characterized in that: Along the first direction, the extension length of the outlet (1112) of the connecting cavity (111) is L1; along the second direction, the extension length of the outlet (1112) of the connecting cavity (111) is L2; ​​L1 and L2 satisfy: L1≥L2; In a plane perpendicular to the height direction of the pressure head body (110), the first direction and the second direction intersect.

24. The welding pressure head according to claim 23, characterized in that The L1 satisfies: 10mm≤L1≤300mm; And / or, L2 satisfies: 3mm≤L2≤100mm.

25. A welding device, characterized in that: include: Welding mechanism; A welding pressure head (100), wherein the welding pressure head (100) is the welding pressure head (100) according to any one of claims 1 to 24; the welding pressure head (100) is connected to the welding mechanism.

26. The welding device according to claim 25, characterized in that The welding mechanism comprises a laser emitting component, wherein a laser emitting end of the laser emitting component and a communicating cavity (111) of the welding pressure head (100) are arranged opposite to each other.

27. The welding device according to claim 25, characterized in that It also includes an air supply component, wherein the air supply port of the air supply component is connected to the air flow inlet (1161) of the welding pressure head (100).

28. The welding device according to claim 25, characterized in that The welding mechanism comprises a dust removal component, and a dust removal port of the dust removal component is in communication with an inlet (1111) of a communication cavity (111) of the welding pressure head (100).

29. A control method for a welding device, characterized in that: Applicable to the welding device according to any one of claims 25 to 28; the method comprising: Acquiring position information of a workpiece to be processed between a welding head (100) in the welding device, and controlling a heating element (120) of the welding head (100) to start according to the position information and preset position information to heat the workpiece to be processed, and acquiring temperature information of the workpiece to be processed; According to the temperature information and the preset temperature information, the heating element (120) is controlled to stop, and the laser emitting element of the welding device is controlled to emit a laser beam to weld the workpiece to be processed.

30. The control method of the welding device according to claim 29, characterized in that: According to the position information and the preset position information, the heating element (120) of the welding pressure head (100) is controlled to start, and further comprising: The gas supply component of the welding device is controlled to start, so as to supply a preset gas to the welding pressure head (100).

31. The control method of the welding device according to claim 29, characterized in that: According to the position information and the preset position information, the heating element (120) of the welding pressure head (100) is controlled to start, and further comprising: The dust removal component of the welding device is controlled to start, so as to form a negative pressure in the communication cavity (111) of the welding pressure head (100).

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