Welding ram and welding apparatus for batteries

Abstract

The application relates to the technical field of battery cells, in particular to a welding pressure head and a welding device for a battery. The welding pressure head is used for welding of an explosion-proof sheet and has a first direction and comprises a pressure head body, a first pressure ring arranged on one side of the pressure head body in the first direction, the first pressure ring and the pressure head body being combined to form a cooling cavity, the pressure head body being provided with a first flow channel and a second flow channel, and the first flow channel and the second flow channel being communicated with the cooling cavity. During welding, the first pressure ring can press the explosion-proof sheet on the battery, at this time, the cooling cavity can cover the explosion-proof valve on the explosion-proof sheet and the peripheral area of the explosion-proof valve. The refrigerant flows into the cooling cavity from the first flow channel, exchanges heat with the explosion-proof sheet in the cooling cavity, and then flows out of the cooling cavity from the second flow channel. In this way, the heat generated during welding of the explosion-proof sheet and the shell can be prevented from affecting the explosion-proof valve, the pressure-bearing capacity of the explosion-proof valve is improved, and the performance of the finished battery cell in bearing internal pressure is ensured.

Description

Technical Field

[0001] This application relates to the field of battery cell technology, and in particular to a welding head and welding equipment for batteries. Background Technology

[0002] Existing cylindrical battery cells are equipped with explosion-proof plates. An explosion-proof valve is located at the center of the explosion-proof plate to release pressure and prevent explosion in case of abnormal gas generation in the battery. During assembly, the explosion-proof plate is laser-welded to one end of the cylindrical casing of the battery cell. If the welding point between the explosion-proof plate and the casing is too close to the explosion-proof valve, the valve may overheat due to the welding heat. This can affect the preset threshold of the explosion-proof valve, making it more susceptible to rupture under relatively low pressure, thus reducing the finished battery cell's ability to withstand internal pressure. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a welding pressure head and a welding device for batteries.

[0004] In a first aspect, this application provides a welding pressure head for welding explosion-proof sheets, having a first orientation, including:

[0005] Indenter body;

[0006] A first pressure ring is disposed on one side of the pressure head body in the first direction, and the first pressure ring and the pressure head body cooperate to form a cooling cavity;

[0007] The pressure head body is provided with a first flow channel and a second flow channel. Both the first flow channel and the second flow channel are connected to the cooling chamber. The first flow channel allows refrigerant to enter the cooling chamber, and the second flow channel allows the refrigerant in the cooling chamber to flow out.

[0008] Optionally, the welding pressure head further includes a second pressure ring, which is disposed on one side of the pressure head body in the first direction and is located inside the first pressure ring. The second pressure ring is spaced apart from the first pressure ring, and the cooling chamber is located between the second pressure ring and the first pressure ring.

[0009] Optionally, the cooling chamber is an annular cavity, and the first flow channel includes a main channel and branch channels;

[0010] The main channel extends along the first direction and supplies the refrigerant; at least two branch channels are provided, and the at least two branch channels are distributed at intervals along the circumference of the cooling chamber, and the branch channels connect the main channel and the cooling chamber.

[0011] Optionally, at least two second flow channels are provided, and the at least two second flow channels are spaced apart circumferentially along the cooling cavity, and the second flow channels and the branch channels are spaced apart circumferentially in the cooling cavity; and / or

[0012] The extension direction of the second flow channel is the same as or at an acute angle to the first direction.

[0013] Optionally, the pressure head body includes a first part and a second part connected to the first part in the first direction. The pressure head body has a radial direction perpendicular to the first direction. In the direction away from the first part, the second part gradually increases in size along the radial direction. The first pressure ring and the second pressure ring are both disposed on the side of the second part away from the first part.

[0014] The main channel is located in the first part, the branch channel is located in the second part, and the branch channel is set at an acute angle to the first direction. The second flow channels are all located in the second part.

[0015] Secondly, embodiments of this application also provide a welding apparatus for batteries, comprising:

[0016] A positioning component having an installation space, the positioning component being used to position the battery to be welded in the installation space;

[0017] Any of the welding heads described in the first aspect, the welding head being movable along the first direction, the welding head being capable of fixing the explosion-proof sheet to the battery to be welded;

[0018] A welding assembly capable of welding the explosion-proof sheet to the battery.

[0019] Optionally, the positioning component includes a first driving member and positioning units connected to the first driving member. The positioning units are arranged in at least two circumferentially spaced around the installation space. The first driving member can drive the positioning units to move toward the installation space, so that all the positioning units position the battery in the installation space.

[0020] Optionally, the welding equipment for the battery further includes a support base and a second driving member. The support base is disposed on the second driving member. The support base is used to place the battery, and the second driving member can drive the support base to rotate and drive the battery to rotate.

[0021] The positioning unit includes a mounting base and a roller rotatably mounted on the mounting base. The mounting base is connected to the first driving member. Each mounting base is provided with at least one roller, and the total number of rollers on all mounting bases exceeds three. The first driving member can drive the mounting base to move and make at least three rollers roll and position with the battery. The welding pressure head can rotate and rotate synchronously with the explosion-proof sheet and the battery.

[0022] Optionally, the welding equipment for batteries further includes a support plate, a frame, and a third drive component, wherein:

[0023] The support plate is movably connected to the frame, the third driving member is disposed on the frame and is connected to the support plate in a transmission manner, and the third driving member can drive the support plate to move along the first direction; the first driving member is fixed to the support plate, and the mounting base is slidably engaged with the support plate.

[0024] Optionally, the support base has a support cavity, at least a portion of the cavity wall of the support cavity is provided with a flexible portion, the flexible portion being able to abut against the battery placed inside the support cavity.

[0025] In some implementations of this application, the welding head includes a head body, with a first pressure ring on one side of the head body in a first direction. The first pressure ring and the head body cooperate to form a cooling chamber. The head body has a first flow channel and a second flow channel, both communicating with the cooling chamber. Refrigerant can enter the cooling chamber from the first flow channel and exit from the second flow channel. During welding, the first pressure ring presses the explosion-proof sheet onto the battery. At this time, the cooling chamber can cover the explosion-proof valve on the explosion-proof sheet and its surrounding area. The refrigerant flows into the cooling chamber from the first flow channel, exchanges heat with the explosion-proof sheet within the cooling chamber, and then flows out of the cooling chamber from the second flow channel. This prevents the heat generated during welding of the explosion-proof sheet to the casing from affecting the explosion-proof valve, thereby improving the pressure-bearing capacity of the explosion-proof valve and ensuring the performance of the finished battery cell in withstanding internal pressure.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a front view of the welding pressure head described in this application;

[0029] Figure 2 yes Figure 1 Sectional view along AA;

[0030] Figure 3 yes Figure 1 Axonometric drawing;

[0031] Figure 4 yes Figure 1 A bottom view;

[0032] Figure 5 yes Figure 1 Top view;

[0033] Figure 6 This is an isometric view of the welding equipment for batteries described in this application;

[0034] Figure 7 yes Figure 6 Side view;

[0035] Figure 8 yes Figure 6 The front view;

[0036] Figure 9 yes Figure 6 Top view;

[0037] Figure 10 yes Figure 9 Sectional view along BB;

[0038] Figure 11 yes Figure 10 A magnified view of part I;

[0039] Figure 12 yes Figure 10 A magnified view of a section II;

[0040] Figure 13 yes Figure 6 Axonometric view of the central support;

[0041] Reference numerals: 1. Welding head; 11. Head body; 11a. First part; 11b. Second part; 111. First flow channel; 1111. Main channel; 1112. Branch channel; 112. Second flow channel; 12. First pressure ring; 13. Cooling chamber; 14. Second pressure ring; 2. Positioning assembly; 2a. Installation space; 21. Positioning unit; 211. Mounting seat; 212. Roller; 22. First driving component; 3. Second driving component; 4. Support seat; 41. Support cavity; 42. Flexible part; 5. Bearing plate; 6. Third driving component; 7. Rotary joint; 100. Battery; 101. Explosion-proof plate; 1011. Valve body; 1012. Welding part; X - First direction. Detailed Implementation

[0042] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0043] Most existing batteries are equipped with explosion-proof diaphragms, the valve body of which is called the explosion-proof valve. When thermal runaway occurs inside the battery due to overcharging, overheating, internal short circuits, physical damage, or other reasons, high-pressure gas is generated inside the casing. This gas causes the internal pressure of the battery to rise sharply. Before the pressure reaches a preset safety threshold, the explosion-proof valve automatically opens, providing a controllable and directional release channel for these gases. By releasing pressure in a timely manner, the explosion-proof valve can prevent the battery casing from rupturing or exploding due to excessive pressure. In the event of failure of the battery management system or other safety mechanisms, the explosion-proof valve can provide physical protection to the battery to ensure its safety.

[0044] In existing cylindrical batteries, the valve body, i.e., the explosion-proof valve, is usually located in the middle of the explosion-proof plate, which is fixed to the explosion-proof hole in the battery casing by means of laser welding or other methods. During welding, the heat from welding can easily be transferred from the explosion-proof plate to the valve body, i.e., the explosion-proof valve, causing the explosion-proof valve to overheat and affecting its explosion-proof performance. In particular, the explosion-proof valve may open prematurely before reaching the set gas pressure threshold.

[0045] Therefore, the high temperatures generated during welding lower the critical opening pressure of the explosion-proof valve, making it easier for the valve to be forced open or ruptured under lower pressure. This reduces the battery's ability to withstand internal pressure, potentially affecting its normal use and lifespan.

[0046] To address the aforementioned issues, this embodiment provides a welding pressure head and welding equipment for batteries.

[0047] refer to Figure 1In a first aspect, this embodiment provides a welding head 1 for welding an explosion-proof sheet 101. Specifically, taking a cylindrical battery 100 as an example, a conventional cylindrical battery 100 typically has a cylindrical housing and an explosion-proof sheet 101. The housing has an explosion-proof hole, and the explosion-proof sheet 100 is welded to the housing to seal the explosion-proof hole. During welding, the welding head 1 presses the explosion-proof sheet 101 against the explosion-proof hole of the housing, and then uses laser welding or other methods to weld the edge of the explosion-proof sheet 101 to the edge of the explosion-proof hole of the battery 100. In the embodiment described in this application, the welding head 1 has a first direction X. In use, the welding head 1 presses the explosion-proof sheet 101 against the housing of the cylindrical battery 100 along the first direction X.

[0048] refer to Figure 2 The welding head 1 includes a head body 11 and a first pressure ring 12. The head body 11 is the main component of the welding head 1. The first pressure ring 12 is disposed on one side of the head body 11 in the first direction X. During welding, the first pressure ring 12 contacts the explosion-proof plate 101 to press the explosion-proof plate 101 against the casing of the battery 100. The first pressure ring 12 and the head body 11 cooperate to form a cooling chamber 13, for example, the cooling chamber 13 is the space enclosed by the inner side of the first pressure ring 12 and the end of the head body 11. During welding, the first pressure ring 12 presses against the surface of the explosion-proof plate 101. At this time, the cooling chamber 13 formed by the first pressure ring 12 and the head body 11 at least covers the area where the explosion-proof valve on the explosion-proof plate 101 is located.

[0049] refer to Figure 2 The pressure head body 11 has a first flow channel 111 and a second flow channel 112, both of which are connected to the cooling chamber 13. A first pressure ring 12 presses against the surface of the explosion-proof sheet 101, and refrigerant is introduced into the first flow channel 111. The refrigerant flows into the cooling chamber 13 through the first flow channel 111 and exchanges heat with the explosion-proof sheet 101 within the cooling chamber 13 to absorb the heat generated by welding on the explosion-proof sheet 101 that is conducted to the explosion-proof valve area. The refrigerant, after absorbing heat, flows out through the second flow channel 112 to carry away the heat generated by welding on the explosion-proof sheet 101 and prevent the welding heat from affecting the explosion-proof valve. In this embodiment, the refrigerant can be compressed air, cryogenic nitrogen, or other cooling gases, or it can be a coolant such as cooling water. In this embodiment, preferably, the refrigerant is cryogenic air.

[0050] Because the welding head 1 can dissipate heat and cool the explosion-proof valve and its surrounding area through a coolant during welding, the heat generated during welding of the explosion-proof disc 101 is less likely to affect the explosion-proof valve on the disc 101. This improves the pressure-bearing capacity of the explosion-proof valve and helps ensure the performance of the finished battery cell in withstanding internal pressure.

[0051] refer to Figure 3 In some embodiments of this application, the welding pressure head 1 optionally includes a second pressure ring 14. The second pressure ring 14 is also disposed on one side of the pressure head body 11 in the first direction X, and is located inside the ring of the first pressure ring 12. In this case, the first pressure ring 12 and the second pressure ring 14 are arranged at a distance, that is, there is a gap between the inner ring surface of the first pressure ring 12 and the outer ring surface of the second pressure ring 14. The cooling cavity 13 is located between the second pressure ring 14 and the first pressure ring 12, that is, the cooling cavity 13 is the space enclosed by the first pressure ring 12, the second pressure ring 14, and the pressure head body 11.

[0052] During welding, both the first pressure ring 12 and the second pressure ring 14 press against the surface of the explosion-proof plate 101. At this time, the cooling chamber 13 covers the surrounding area of ​​the explosion-proof valve on the explosion-proof plate 101. That is, along the first direction X, the explosion-proof valve is at least within the projection range of the annular hole of the second pressure ring 14, and the explosion-proof valve and its surrounding area are within the projection range of the annular cavity of the cooling chamber 13. After the first pressure ring 12 and the second pressure ring 14 press against the surface of the explosion-proof plate 101, refrigerant can be introduced into the first flow channel 111. The refrigerant flows into the cooling chamber 13 through the first flow channel 111 and exchanges heat with the surrounding area of ​​the explosion-proof valve on the explosion-proof plate 101 within the cooling chamber 13 to absorb the heat generated on the explosion-proof plate 101 due to welding and prevent the heat generated by welding from being transferred to the explosion-proof valve. The refrigerant, after absorbing heat, flows out from the second flow channel 112 to carry away the heat generated on the explosion-proof plate 101 due to welding and prevent the heat generated by welding from affecting the explosion-proof valve. The second pressure ring 14 can also prevent the refrigerant from flowing to the explosion-proof valve, thereby avoiding adverse effects of the refrigerant on the explosion-proof valve.

[0053] refer to Figure 4 In the embodiments described in the application, the projections of the first pressure ring 12 and the second pressure ring 14 in the first direction X are both circular. Alternatively, the projections of the first pressure ring 12 and the second pressure ring 14 in the first direction X can also be elliptical rings, polygonal rings, etc. Preferably, the first pressure ring 12 and the second pressure ring 14 are arranged concentrically, that is, the axes of the first pressure ring 12 and the second pressure ring 14 coincide.

[0054] refer to Figure 2In some embodiments of this application, the cooling cavity 13 is an annular cavity, that is, the cooling cavity 13 is the space enclosed by the annular gap between the aforementioned first pressure ring 12 and the second pressure ring 14, and the pressure head body. The first flow channel 111 includes a main channel 1111 and branch channels 1112, wherein the main channel 1111 extends along the first direction X. When the refrigerant flows into the main channel 1111, this can reduce the flow resistance encountered by the refrigerant, which is beneficial to ensuring the flow rate of the refrigerant. The branch channels 1112 connect the main channel 1111 and the cooling cavity 13, and the number of them is at least two, specifically three, four, five, six or even more. In the embodiments described in this application, there are six branch channels 1112, and the six branch channels 1112 are connected to the same main channel 1111. The at least two branch channels 1112 are distributed circumferentially around the cooling cavity 13, which can ensure that the refrigerant enters the cooling cavity 13 evenly in the circumferential direction. This ensures a more uniform temperature distribution within the cooling chamber 13, preventing localized overcooling or overheating and guaranteeing a consistent cooling effect for the explosion-proof fin 101. Furthermore, it prevents refrigerant stagnation within the cooling chamber 13, reducing dead zones and improving heat exchange efficiency between the refrigerant and the explosion-proof fin 101. The uniform circumferential flow of the refrigerant into the cooling chamber 13 also helps maintain pressure balance, preventing eddies or backflow caused by uneven pressure.

[0055] refer to Figure 4 In some embodiments of this application, at least two second flow channels 112 are provided, specifically two, three, four, or even more. At least two second flow channels 112 are spaced apart circumferentially along the cooling chamber 13 to improve the efficiency of refrigerant flow out of the cooling chamber 13, ensuring that the refrigerant promptly removes the heat generated during welding from the explosion-proof sheet 101. Simultaneously, the second flow channels 112 and branch channels 1112 are spaced apart circumferentially in the cooling chamber 13, which helps prevent localized refrigerant stagnation in the cooling chamber 13, reduces flow dead zones within the cooling chamber 13, and allows the refrigerant to flow out of the second flow channels 112 promptly, thereby improving the heat exchange efficiency between the refrigerant and the explosion-proof sheet 101 within the cooling chamber 13.

[0056] For example, in this embodiment, six branch channels 1112 and two second flow channels 112 can be provided. The six branch channels 1112 and the two second flow channels 112 are evenly arranged along the circumference of the cooling cavity 13, and three branch channels 1112 are provided between the two second flow channels 112. Alternatively, four branch channels 1112 and four second flow channels 112 can be provided. The four branch channels 1112 and the four second flow channels 112 are evenly arranged along the circumference of the cooling cavity 13, and one branch channel 1112 is provided between any two second flow channels 112, and one second flow channel 112 is provided between any two branch channels 1112, that is, the second flow channels 112 and the branch channels 1112 are staggered along the circumference of the cooling cavity 13.

[0057] refer to Figure 2 In some embodiments of this application, the extension direction of the second flow channel 112 is the same as that of the first direction X, or the extension direction of the second flow channel 112 is set at an acute angle to the first direction X. When welding the explosion-proof sheet 101 and the battery 100 housing using laser welding, it is necessary to blow protective gas onto the welding area of ​​the explosion-proof sheet 101 and the battery 100 housing. The fact that the extension direction of the second flow channel 112 is the same as or at an acute angle to the first direction X allows the refrigerant discharged from the second flow channel 112 to be as far away as possible from the welding area of ​​the explosion-proof sheet 101 and the battery 100 housing, thus preventing the refrigerant from dispersing the protective gas and consequently avoiding any adverse effects of the refrigerant on the welding of the explosion-proof sheet 101 and the battery 100 housing.

[0058] refer to Figure 5 In some embodiments of this application, the pressure head body 11 includes a first part 11a and a second part 11b. The first part 11a and the second part 11b are connected in a first direction X. They can be connected by integral molding, or by welding, bonding, fastener connection, or other connection methods. In the embodiments described in this application, preferably, the first part 11a and the second part 11b are integrally molded.

[0059] The pressure head body 11 has a radial direction perpendicular to the first direction X. In the embodiment described in this application, the first part 11a can be cylindrical in shape, and in this case, the axis of the first part 11a is preferably arranged along the first direction X. The main channel 1111 is disposed within the first part 11a and is preferably coaxially arranged with the first part 11a. One end of the first part 11a is connected to the second part 11b, and preferably, the first part 11a and the second part 11b are coaxially arranged. The other end of the second part 11b may have a threaded connection structure to install the welding pressure head 1.

[0060] In the direction away from the first part 11a, the second part 11b gradually increases in size along the radial direction of the pressure head body 11. At this time, the shape of the second part 11b is frustoconical. Specifically, the end of the second part 11b facing the first part 11a has the smallest diameter and is connected to the first part 11a; the end of the second part 11b facing away from the first part 11a has the largest diameter and is connected to the first pressure ring 12 and the second pressure ring 14. The branch channel 1112 is set at an acute angle to the first direction X, and both the branch channel 1112 and the second flow channel 112 are located in the second part 11b.

[0061] Both the first pressure ring 12 and the second pressure ring 14 are located on the side of the second part 11b away from the first part 11a. Since the size of the second part 11b gradually increases in the radial direction of the pressure head body 11 in the direction away from the first part 11a, the end of the second part 11b with the larger radial dimension can provide a larger area for arranging the first pressure ring 12 and the second pressure ring 14. This facilitates the arrangement of the first pressure ring 12 and the second pressure ring 14, providing a structural basis for the first pressure ring 12 and the second pressure ring 14 to form a cooling cavity 13 of suitable size. Simultaneously, by adopting the above structure, the welding pressure head 1 can reduce its volume while meeting the arrangement requirements of the first flow channel 111, the second flow channel 112, the first pressure ring 12, and the second pressure ring 14. This facilitates the installation and use of the welding pressure head 1 and also helps reduce the production and processing costs of the welding pressure head 1.

[0062] refer to Figure 6 Secondly, embodiments of this application also provide a welding apparatus for a battery 100. The welding apparatus specifically includes a positioning component 2, a welding component (not shown), and any of the welding pressure heads 1 described in the first aspect. The positioning component 2 has an installation space 2a, within which the battery 100 to be welded can be positioned and installed. The welding pressure head 1 can move along a first direction X and press and fix the explosion-proof sheet 101 against the surface of the battery 100 to be welded. The welding component can specifically be a welding device such as a laser welding apparatus that can weld the explosion-proof sheet 101 onto the battery 100. In embodiments of this application, preferably, the welding component is a laser welding apparatus.

[0063] The welding head 1 is any of the welding head 1 described in the first aspect. Therefore, when the first pressure ring 12 of the welding head 1 presses against the surface of the explosion-proof disc 101, refrigerant can be introduced into the first flow channel 111. The refrigerant flows into the cooling chamber 13 through the first flow channel 111 and exchanges heat with the explosion-proof disc 101 in the cooling chamber 13 to absorb the heat generated on the explosion-proof disc 101 due to welding. The refrigerant, after absorbing heat, flows out from the second flow channel 112 to carry away the heat generated on the explosion-proof disc 101 due to welding and to prevent the heat generated by welding from affecting the explosion-proof valve. Since the welding head 1 can dissipate heat and cool the explosion-proof valve and its surrounding area through the refrigerant during welding, the heat generated during welding of the explosion-proof disc 101 is less likely to affect the explosion-proof valve on the explosion-proof disc 101. This can improve the pressure-bearing capacity of the explosion-proof valve and help ensure the performance of the finished battery cell in withstanding internal pressure. Furthermore, using any of the welding heads 1 as described in the first aspect also helps to ensure the welding capability of the welding equipment and prevent the welding equipment from affecting the explosion-proof valve performance of the battery 100 during welding.

[0064] refer to Figure 7 In some embodiments of this application, the positioning component 2 includes a first driving member 22 and positioning units 21 connected to the first driving member 22. At least two positioning units 21 are arranged circumferentially around the mounting space 2a. Specifically, there may be two, three, four, or even more positioning units 21. Driven by the first driving member 22, the positioning units 21 can move towards the mounting space 2a so that all positioning units 21 can cooperate to position the battery 100 within the mounting space 2a. In specific embodiments of this application, the first driving member 22 may be a cylinder, electric cylinder, hydraulic cylinder, or other driving device capable of outputting linear motion. In this case, the first driving member 22 can be directly and fixedly connected to the positioning component 2. When the moving part of the first driving member 22 extends or retracts, the positioning units 21 can move towards the mounting space 2a. The first driving member 22 may also be a motor, pneumatic motor, hydraulic motor, or other driving device that outputs torque. In this case, the first driving member 22 and the positioning component 2 can be connected by a transmission mechanism such as a rack and pinion mechanism or a crank-slider mechanism. When the moving part of the first drive member 22 rotates, the positioning unit 21 can move toward the mounting space 2a.

[0065] In the embodiments described in this application, preferably, two positioning units 21 are provided, and the two positioning units 21 can be close to or far from each other. The first driving member 22 is a guide rail cylinder, which has two moving parts, and each of the two moving parts is fixedly connected to a positioning unit 21. The movement direction of the moving parts of the guide rail cylinder is orthogonal to the first direction X. Preferably, the first direction X is in the same direction as the direction of gravity, and the movement direction of the moving parts of the guide rail cylinder is in the same direction as a horizontal direction. When the guide rail cylinder moves, it can simultaneously drive the two positioning units 21 to move closer to the installation space 2a, so that the battery 100 is opposite to the welding head 1 in the first direction X. During welding, the welding head 1 can press the explosion-proof sheet 101 against the battery 100 along the first direction X. The welding assembly is provided on the side of the battery 100 so as to weld and fix the explosion-proof sheet 101 to the battery 100.

[0066] refer to Figure 8 In some embodiments of this application, the welding equipment for the battery 100 may optionally include a support base 4 and a second driving member 3. The support base 4 is disposed on the second driving member 3, meaning the support base 4 is connected to the moving part of the second driving member 3. After the battery 100 is positioned within the mounting space 2a, the support base 4 can be supported on the bottom of the battery 100. When the second driving member 3 moves, the support base 4 can rotate, and the battery 100 will rotate due to friction.

[0067] refer to Figure 9 The positioning unit 21 includes a mounting base 211 and a roller 212 rotatably mounted on the mounting base 211. The mounting base 211 is connected to a first driving member 22, and the roller 212 is rotatably mounted on the mounting base 211. Each mounting base 211 has at least one roller 212, and the total number of rollers 212 on all mounting bases 211 exceeds three. When installing the battery 100, the first driving member 22 can drive the mounting base 211 to move, so that the roller 212 on the positioning base contacts the battery 100, thereby achieving positioning of the battery 100 within the installation space 2a. All rollers 212 are in rolling engagement with the battery 100; that is, when the battery 100 rotates, the rollers 212 can rotate synchronously under the action of friction. The welding head 1 is rotatably mounted on a welding device for the battery 100. When the battery 100 rotates, the welding head 1 can rotate synchronously with the explosion-proof sheet 101 and the battery 100. In the embodiments described in this application, the second driving member 3 may specifically be a driving device capable of outputting torque, such as an electric motor, a pneumatic motor, or a hydraulic motor, and the rotation axis of the moving part of the second driving member 3 coincides with the rotation axis of the battery 100.

[0068] For a cylindrical battery 100, its explosion-proof plate 101 is typically a disc structure. The welding point between the explosion-proof plate 101 and the battery 100 is at the edge of the explosion-proof plate 101, thus the welding trajectory between the explosion-proof plate 101 and the battery 100 is circular. In the embodiment described in this application, since the battery 100 and the explosion-proof plate 101 can rotate with the support base 4, the welding assembly can be fixedly mounted on the welding equipment. During welding, as the battery 100 and the explosion-proof plate 101 rotate, the welding assembly continuously performs welding operations on the battery 100 and the explosion-proof plate 101 according to a preset circular welding trajectory. The rotation of the battery 100 and the explosion-proof plate 101 does not require additional movement space, while the movement of the welding assembly around the battery 100 requires a certain amount of movement space. Therefore, compared to the arrangement where the battery 100 and the explosion-proof plate 101 are fixed and the welding assembly moves around the battery 100, the arrangement where the welding assembly remains stationary and the battery 100 and the explosion-proof plate 101 rotate can reduce the space occupied by the welding equipment.

[0069] In other embodiments of this application, the welding equipment for the battery 100 may further include a driving device such as a robotic arm, with the welding assembly mounted at the end effector of the robotic arm. In this case, the welding pressure head 1 can be fixedly mounted on the welding equipment. The positioning unit 21 may consist only of a mounting base 211, with the first driving member 22 driving the mounting base 211 to move towards the mounting space 2a, thereby positioning the battery 100 within the mounting space 2a. At this time, the robotic arm can drive the welding equipment to move along a preset welding trajectory, so that the explosion-proof sheet 101 is welded and fixed onto the battery 100.

[0070] refer to Figure 10 In some embodiments of this application, optionally, the welding equipment for the battery 100 further includes a support plate 5, a frame (not shown), and a third drive member 6, wherein the frame is a structure that provides an installation base for other components of the welding equipment. The support plate 5 is movably connected to the frame, the third drive member 6 is disposed on the frame and is drively connected to the support plate 5, and the welding head 1 is rotatably disposed on the frame via bearings, etc. The first drive member 22 is fixedly connected to the support plate 5, and the mounting base 211 is slidably engaged with the support plate 5. When the third drive member 6 moves, the support plate 5 can move along the first direction X under the drive of the third drive member 6, so that the battery 100 installed in the installation space 2a can move closer to or further away from the welding head 1 as the support plate 5 moves. As the support plate 5 moves closer to the welding head 1, the welding head 1 can press the explosion-proof sheet 101 against the battery 100 and achieve positioning of the battery 100 in the first direction X.

[0071] Specifically, in the embodiments described in this application, a guide rail is provided on the frame, and the extension direction of the guide rail is set along the first direction X. The support plate 5 is slidably mounted on the guide rail of the frame. The third driving member 6 can be a driving device that can output linear motion, such as a cylinder, electric cylinder, or hydraulic cylinder. In this case, the third driving member 6 can be directly fixedly connected to the support plate 5. When the moving part of the third driving member 6 extends or retracts, the support plate 5 can move towards the welding pressure head 1. The third driving member 6 can also be a driving device that outputs torque, such as a motor, pneumatic motor, or hydraulic motor. In this case, the third driving member 6 and the support plate 5 can be connected by a transmission mechanism such as a gear and rack mechanism or a crank-slider mechanism. When the moving part of the third driving member 6 rotates, the support plate 5 can move towards the installation space 2a.

[0072] The second driving component 3 can be mounted on the driving plate so that it moves along the first direction X with the support plate 5. The second driving component 3 is preferably a motor. The moving part of the second driving component 3 can be directly connected to the support base 4 through fasteners, couplings, or other connecting structures. The axis of motion of the moving part of the second driving component 3 coincides with the axis of rotation of the support base 4. The first driving component 22 is fixedly mounted on the support plate 5, and is preferably a guide rail cylinder. The guide rail cylinder has two moving parts, and each of the two moving parts is fixedly connected to a positioning unit 21. The direction of motion of the moving part of the guide rail cylinder is orthogonal to the first direction X. Preferably, the first direction X is in the same direction as the direction of gravity, and the direction of motion of the moving part of the guide rail cylinder is in the same direction as a horizontal direction.

[0073] Before welding, the battery 100 can be placed on the support base 4, and then the first driving member 22 drives the positioning unit 21 to move closer to the installation space 2a. After the positioning unit 21 contacts the battery 100, it is moved so that the battery 100 is directly facing the welding head 1 in the first direction X. The third driving member 6 drives the carrier plate 5 to move towards the welding head 1 until the explosion-proof plate 101 of the battery 100 is pressed against the battery 100. (Reference) Figure 11 The explosion-proof plate 101 has a valve body 1011 and a welding part 1012, wherein the valve body 1011 is used to install an explosion-proof valve, and the welding part 1012 is used to weld to the housing of the battery 100. The second driving member 3 drives the support base 4 to rotate, and the support base 4 drives the battery 100 to rotate, so that the welding assembly can complete the welding of the explosion-proof plate 101 and the battery 100 along a preset welding trajectory.

[0074] The welding head 1 needs to be rotatably mounted on the frame so that it rotates synchronously with the battery 100. In this embodiment, the welding head 1 is rotatably mounted on the frame via bearings. The welding equipment may also include a rotary joint 7, which has a first end and a second end that are rotatable relative to each other. The end of the welding head 1 used for introducing refrigerant can be fixedly connected to the first end of the rotary joint 7. The second end of the rotary joint 7 can be connected to a pipe that connects to an external refrigerant source. In this way, when the welding head 1 rotates, the pipe does not need to rotate synchronously with the welding head 1. This ensures that the pipe is connected to the welding head 1 while avoiding pipe rotation and entanglement.

[0075] refer to Figure 12 In some embodiments of this application, the support base 4 has a support cavity 41. When the battery 100 is installed, the end of the battery 100 is placed inside the support cavity 41. At least a portion of the cavity wall of the support cavity 41 is provided with a flexible portion 42, which abuts against the battery 100 placed inside the support cavity 41. The flexible portion 42 can increase the frictional resistance between the support base 4 and the battery 100, which helps to avoid slippage between the support base 4 and the battery 100.

[0076] refer to Figure 13 In the embodiments described in this application, the flexible part 42 can be made of rubber or silicone. Specifically, the flexible part 42 can be multiple plate-like structures disposed at the bottom of the support cavity 41 and spaced apart from each other. Compared to a monolithic structure, this divides the contact surface between the flexible part 42 and the battery 100 into multiple spaced portions. Since each portion has a relatively small area, it is easier to ensure a close fit with the battery 100. Therefore, dividing the flexible part 42 into multiple spaced plate-like structures ensures a full fit between the flexible part 42 and the battery 100, which helps to prevent slippage between the support base 4 and the battery 100.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0078] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or at least two of the features. In the description of this utility model, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0079] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0080] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or at least two embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A welding head for welding explosion-proof sheets, having a first direction (X), characterized in that, include: Indenter body (11); The first pressure ring (12) is disposed on one side of the pressure head body (11) in the first direction (X), and the first pressure ring (12) and the pressure head body (11) cooperate to form a cooling cavity (13); The pressure head body (11) is provided with a first flow channel (111) and a second flow channel (112). Both the first flow channel (111) and the second flow channel (112) are connected to the cooling chamber (13). The first flow channel (111) allows refrigerant to enter the cooling chamber (13), and the second flow channel (112) allows the refrigerant in the cooling chamber (13) to flow out.

2. The welding pressure head according to claim 1, characterized in that, The welding head further includes a second pressure ring (14), which is disposed on one side of the head body (11) in the first direction (X), and the second pressure ring (14) is located inside the first pressure ring (12). The second pressure ring (14) and the first pressure ring (12) are spaced apart, and the cooling chamber (13) is located between the second pressure ring (14) and the first pressure ring (12).

3. The welding pressure head according to claim 2, characterized in that, The cooling chamber (13) is an annular cavity, and the first flow channel (111) includes a main channel (1111) and a branch channel (1112); The main channel (1111) extends along the first direction (X) and allows the refrigerant to flow in; at least two branch channels (1112) are provided, and the at least two branch channels (1112) are distributed circumferentially at intervals along the cooling chamber (13), and the branch channels (1112) connect the main channel (1111) and the cooling chamber (13).

4. The welding pressure head according to claim 3, characterized in that, At least two second flow channels (112) are provided, and at least two second flow channels (112) are arranged circumferentially spaced in the cooling cavity (13), and the second flow channels (112) and the branch channels (1112) are arranged circumferentially spaced in the cooling cavity (13); and / or The extension direction of the second flow channel (112) is the same as or at an acute angle to the first direction (X).

5. The welding pressure head according to claim 4, characterized in that, The pressure head body (11) includes a first part (11a) and a second part (11b) connected to the first part (11a) in the first direction (X). The pressure head body (11) has a radial direction perpendicular to the first direction (X). In the direction away from the first part (11a), the second part (11b) gradually increases in size along the radial direction. The first pressure ring (12) and the second pressure ring (14) are both disposed on the side of the second part (11b) away from the first part (11a). The main channel (1111) is located in the first part (11a), the branch channel (1112) is located in the second part (11b), and the branch channel (1112) is located at an acute angle to the first direction (X). The second flow channels (112) are all located in the second part (11b).

6. A welding apparatus for batteries, characterized in that, include: Positioning component (2), the positioning component (2) having an installation space (2a), the positioning component (2) being used to position the battery (100) to be welded in the installation space (2a); The welding head (1) as described in any one of claims 1-5 is movable along the first direction (X) and can fix the explosion-proof sheet (101) to the battery (100) to be welded. A welding assembly capable of welding the explosion-proof sheet (101) to the battery (100).

7. The welding equipment for batteries according to claim 6, characterized in that, The positioning component (2) includes a first driving member (22) and a positioning unit (21) connected to the first driving member (22). The positioning unit (21) is provided in at least two and arranged circumferentially around the mounting space (2a). The first driving member (22) can drive the positioning unit (21) to move toward the mounting space (2a) so that all the positioning units (21) position the battery (100) in the mounting space (2a).

8. The welding equipment for batteries according to claim 7, characterized in that, The welding equipment for the battery also includes a support base (4) and a second drive member (3). The support base (4) is disposed on the second drive member (3). The support base (4) is used to place the battery (100), and the second drive member (3) can drive the support base (4) to rotate and drive the battery (100) to rotate. The positioning unit (21) includes a mounting base (211) and a roller (212) rotatably mounted on the mounting base. The mounting base (211) is connected to the first driving member (22). Each mounting base (211) is provided with at least one roller (212), and the sum of the number of rollers (212) on all mounting bases (211) exceeds three. The first driving member (22) can drive the mounting base (211) to move and make at least three rollers (212) roll and position with the battery (100). The welding head (1) can rotate and rotate synchronously with the explosion-proof sheet (101) and the battery (100).

9. The welding equipment for batteries according to claim 8, characterized in that, The welding equipment for batteries also includes a support plate (5), a frame, and a third drive unit (6), wherein: The support plate (5) is movably connected to the frame, the third drive member (6) is disposed on the frame and is connected to the support plate (5) in a transmission manner, and the third drive member (6) can drive the support plate (5) to move along the first direction (X); the first drive member (22) is fixed to the support plate (5), and the mounting base (211) is slidably engaged with the support plate (5).

10. The welding equipment for batteries according to claim 8, characterized in that, The support base (4) has a support cavity (41), and at least a portion of the cavity wall of the support cavity (41) is provided with a flexible part (42), which is capable of abutting against the battery (100) placed in the support cavity (41).

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