Welding protective cover, welding equipment and battery production line

Abstract

The utility model relates to the technical field of battery manufacturing, and provides a welding protective cover, welding equipment and a battery production line. The welding protection cover is used for covering an end cover of a battery monomer, the end cover is provided with an electrode terminal and a liquid injection hole, the welding protection cover comprises a cover body, the cover body is used for covering the end cover and covering the liquid injection hole, one side of the cover body in the thickness direction is provided with a first avoiding cavity, and the first avoiding cavity is used for avoiding the electrode terminal; and at least one side of the cover body along the width direction of the single battery is provided with an initial welding clearance groove, and the initial welding clearance groove is configured as an initial welding position. According to the technical scheme, the phenomenon that the electrode terminal is ablated by splashing welding slag during welding of the end cover of the battery monomer and the shell can be reduced, welding of the end cover of the battery monomer and the shell is facilitated, and the later use stability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a welding protective cover, welding equipment and a battery production line. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] At present, end cap laser welding is an important process in the battery production process. If there is no protective device during the laser welding process of the end cap and the shell of the battery cell, the spattering slag generated by the welding will contaminate the electrode terminals and the injection holes on the end cap. The spattering slag has high temperature and will burn the electrode terminals. At the same time, the spattering slag will also enter the battery cell through the injection hole on the end cap, thereby causing the performance of the battery cell to decline and even causing accidents such as short circuit and fire. Utility Model Content

[0004] The purpose of the present application is to provide a welding protective cover, welding equipment and battery production line, so as to improve the safety of welding the end cover and shell of the battery cell. This purpose is achieved through the following technical solutions:

[0005] In the first aspect, the present application provides a welding protection cover for covering the end cover of a battery cell, the end cover being provided with an electrode terminal and an injection hole, the welding protection cover comprising: a cover body, the cover body being provided to cover the end cover and covering the injection hole, the cover body having a first avoidance cavity, the first avoidance cavity being provided on one side in the thickness direction of the cover body, the first avoidance cavity being used to avoid the electrode terminal, the cover body further having a starting welding avoidance groove, the starting welding avoidance groove being provided on at least one side of the cover body along the width direction of the battery cell, the starting welding avoidance groove being configured as the starting position of welding.

[0006] According to the welding protection cover provided by the present application, when the cover body is set on the end cover of the battery cell, the cover body can cover the injection hole on the end cover, and the first avoidance cavity on the cover body can avoid the electrode terminal, so that the electrode terminal can be accommodated in the first avoidance cavity. In this way, when welding the end cover and the shell of the battery cell, it can not only protect the electrode terminal, but also reduce the risk of splashing welding slag entering the battery cell through the injection hole during welding, thereby helping to improve the safety of welding the end cover and the shell. In addition, by setting a starting welding avoidance groove on one side of the cover body along the wide band direction of the battery cell, so that the cover body avoids the starting welding position of the welding track, the risk of burning the welding protection cover during welding can be reduced, thereby helping to improve the safety of the cover body.

[0007] In addition, the welding protection cover provided in the present application may also have the following additional technical features:

[0008] In some embodiments of the present application, the first avoidance cavity has an opening on a side facing the battery cell, and a circumferential edge of the opening is provided with a chamfer.

[0009] In the above technical solution, by setting a chamfer on the circumferential edge of the opening of the first avoidance cavity, not only can the electrode terminal be quickly accommodated in the first avoidance cavity when the cover body is covered on the end cover of the battery cell, thereby improving the assembly efficiency of the cover body, but also the risk of the edge of the electrode terminal being crushed when the cover body is pressed down can be reduced.

[0010] In some embodiments of the present application, the electrode terminal includes a positive electrode terminal and a negative electrode terminal; the number of the first avoidance cavities is two, the two first avoidance cavities are arranged at intervals, and are configured to avoid the positive electrode terminal and the negative electrode terminal respectively.

[0011] In the above technical solution, the two first avoidance cavities are respectively arranged on the outer peripheral sides of the positive electrode terminal and the negative electrode terminal, so as to protect the positive electrode terminal and the negative electrode terminal during the welding process of the end cover and the shell, and reduce the risk of the positive electrode terminal and the negative electrode terminal being burned by the splashing welding slag during welding, so as to improve the safety of the welding process.

[0012] In some embodiments of the present application, the end cover is also provided with a pressure relief mechanism, and a second avoidance cavity is provided on one side of the cover body, and the second avoidance cavity is used to avoid the pressure relief mechanism, wherein along the length direction of the battery cell, the starting welding avoidance groove is located between the two first avoidance cavities.

[0013] In the above technical solution, by setting a second avoidance cavity on the side of the cover body facing the battery cell, when the cover body is covered on the end cover of the battery cell, the second avoidance cavity can cover the pressure relief mechanism, thereby reducing the risk of the pressure relief mechanism being burned by the splashing welding slag during welding, thereby further improving the safety of the welding process and improving the stability of the battery cell in the later use.

[0014] In some embodiments of the present application, the second avoidance cavity has a plurality of connected inner side walls, and adjacent inner side walls are connected by rounded transition.

[0015] In the above technical solution, by using rounded transition connections between the multiple inner walls of the second avoidance cavity, the contour shape of the second avoidance cavity can be adapted to the contour shape of the pressure relief mechanism, so that the second avoidance cavity can cover the pressure relief mechanism, further improving the assembly efficiency of the cover body and the end cover, and reducing the risk of damaging the pressure relief mechanism when the cover body is pressed down.

[0016] In some embodiments of the present application, a clamping groove is provided on a side of the cover body facing away from the first avoidance cavity, and the clamping groove is used for a clamping mechanism to clamp the cover body.

[0017] In the above technical solution, a clamping groove is provided on the side of the cover body away from the first avoidance cavity, so that the clamping claws of the clamping mechanism can be inserted into and clamp the cover body, thereby improving the disassembly and assembly efficiency of the welding protection cover.

[0018] In some embodiments of the present application, a positioning hole is further provided on the side of the cover body away from the first avoidance cavity, and the positioning hole is spaced apart from the clamping groove and is configured to be used for the clamping mechanism to be positioned and connected with the cover body. In the above technical solution, when the clamping mechanism clamps the cover body, it can first be positioned and connected with the cover body through the positioning hole. For example, the clamping mechanism can first be inserted into the positioning hole through the positioning column, and then inserted into the clamping groove through the clamping claw, and the purpose of moving the cover body is achieved by applying a clamping force to the cover body, which helps to further improve the efficiency of disassembly and assembly of the welding protection cover and the end cover.

[0019] In some embodiments of the present application, a clamping notch is provided on the side of the cover body facing away from the first avoidance cavity, the clamping groove is recessed into the cover body along the length direction of the battery cell and extends along the length direction of the battery cell, and the clamping notch is connected to the clamping groove.

[0020] In the above technical solution, the clamping notch is used for the clamping mechanism to pass through and penetrate into the clamping groove, and move along the extension direction of the clamping groove until it can clamp the fixed cover body, thereby clamping and moving the welding protection cover. The structure and principle are relatively simple and easy to implement.

[0021] In some embodiments of the present application, the number of the clamping slots is two, and the two clamping slots are spaced apart and symmetrically arranged; the number of the positioning holes is two, and the two positioning holes are respectively arranged close to the two clamping slots.

[0022] In the above technical solution, by setting the number of clamping grooves and positioning holes to two, the clamping mechanism is first positioned and connected to the cover body through the two positioning holes, and then inserted into the two clamping grooves to apply a clamping force to the cover body to clamp the cover body, thereby making the force on the cover body more uniform, thereby improving the stability of the cover body during installation and disassembly, and further improving the efficiency of assembly and disassembly of the cover body and the end cover.

[0023] In some embodiments of the present application, the cover body includes a steel cover, and a surface of the steel cover is provided with a chrome plating layer or a ceramic coating.

[0024] In the above technical solution, the steel cover has greater hardness and rigidity, which can provide good support and help improve the stability of the cover body in protecting the electrode terminals and the pressure relief mechanism on the end cover. A chrome plating layer or a ceramic coating is provided on the surface of the cover body, and the chrome plating layer or the ceramic coating has good wear resistance and high temperature resistance, and can reduce the risk of welding slag sticking to the cover body during welding, and can further improve the safety of the welding process.

[0025] In a second aspect, the present application provides a welding device, comprising: a welding device; a clamping mechanism; and a welding protection cover as described in any one of the embodiments of the first aspect, wherein the welding protection cover is used to cover the end cover of a battery cell, the clamping mechanism is used to clamp and move the welding protection cover, and the welding device is used to weld the shell of the battery cell to the end cover.

[0026] According to the welding equipment provided in the present application, since it includes the welding protection cover described in any one of the embodiments of the first aspect, it has the technical effects of any of the above embodiments, which will not be described in detail here.

[0027] In a second aspect, the present application provides a battery production line, comprising: a transmission device for transmitting battery cells; and a welding device as described in the embodiment of the second aspect.

[0028] According to the battery production line provided in the present application, the transmission device continuously transmits battery cells, so that the multiple battery cells transmitted can be welded one by one by using the welding device. Since the battery production line provided by the third aspect embodiment includes the welding equipment described in the second aspect embodiment, it also has the technical effects of any of the above-mentioned embodiments, which will not be repeated here.

[0029] In some embodiments of the present application, when the cover body is disposed on the end cap and covers the injection hole of the end cap, along the direction from the cover body to the end cap, the projection of the cover body on the end cap is located inside the end cap.

[0030] In the above technical solution, the outer contour size of the cover body is not larger than the outer contour size of the end cover. Thus, when the cover body is placed on the end cover, there is no gap between the cover body and the end cover. Thus, welding slag and dust generated during the welding process cannot enter the covering area between the cover body and the end cover, thereby further reducing the possibility of burning or contamination of the electrode terminal, the pressure relief mechanism and the injection hole, thereby improving the safety during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of the exploded structure of a welding protection cover and a battery cell before assembly provided by some embodiments of the present application;

[0033] Figure 2 A schematic structural diagram of a welding protection cover provided in some embodiments of the present application from one perspective;

[0034] Figure 3 A schematic structural diagram of a welding protection cover provided in some embodiments of the present application from another perspective;

[0035] Figure 4 A structural schematic diagram of a welding protection cover provided in some embodiments of the present application from another perspective;

[0036] Figure 5 A partial cross-sectional structural schematic diagram of a welding protection cover provided in some embodiments of the present application.

[0037] The reference numerals are as follows:

[0038] 100. Welding protective cover; 200. Battery cell;

[0039] 10. Cover body; 11. First avoidance cavity; 111. Chamfer; 12. Initial welding avoidance groove; 13. Clamping groove; 14. Positioning hole; 15. Second avoidance cavity; 151. Fillet;

[0040] 21. Shell; 22. End cover; 221. Positive electrode terminal; 222. Negative electrode terminal; 223. Liquid injection hole; 224. Pressure relief mechanism; 23. Electrode assembly. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0050] Among them, end cap laser welding is an important process in the battery production process. If there is no protective device during the laser welding process of the end cap and the shell of the battery cell, the spattering slag generated by the welding will contaminate the electrode terminals and the injection holes on the end cap. The spattering slag has high temperature and will burn the electrode terminals. At the same time, the spattering slag will also enter the battery cell through the injection hole on the end cap, thereby causing the performance of the battery cell to decline, and even causing accidents such as short circuit and fire.

[0051] In order to solve the problem that the electrode terminal is easily burned when the end cover of the battery cell is welded to the shell, and the splashed welding slag easily enters the interior of the battery cell, resulting in a decrease in the performance of the battery cell, or even a short circuit and fire, the present application designs a welding protection cover, by setting a first avoidance cavity on the cover body of the welding protection cover, the first avoidance cavity is set toward the battery cell, and is used to avoid the electrode terminal on the end cover. When the cover body is set on the end cover, the electrode terminal can be accommodated in the first avoidance cavity, so that the splashed welding when the end cover is welded to the shell will not burn the electrode terminal, and when the cover body is set on the end cover, it can cover the injection hole, so that the splashed welding slag during welding will not enter the interior of the battery cell from the injection hole, thereby improving the performance of the battery cell in the later stage and reducing the risk of short circuit and fire. In addition, the cover body is also provided with a starting welding avoidance groove on at least one side along the width direction of the battery cell, and the starting welding avoidance groove can be used for the welding device as the starting welding position to provide space for starting welding, reduce the risk of the cover body being burned, and thus improve the safety of the cover body.

[0052] The welding protection cover disclosed in the embodiment of the present application is used to cover the end cover of the battery cell, and is used to protect the electrode terminals and injection holes on the end cover when the end cover and the shell of the battery cell are welded. At the same time, it can reduce the risk of splashing welding slag entering the battery cell from the injection hole during welding, causing the battery cell performance to deteriorate, or even causing a short circuit and fire.

[0053] See also Figures 1 to 3 , Figure 1 A schematic diagram of the exploded structure of a welding protection cover and a battery cell before assembly provided by some embodiments of the present application; Figure 2 A schematic structural diagram of a welding protection cover provided in some embodiments of the present application from one perspective; Figure 3A structural schematic diagram of another perspective of a welding protection cover provided for some embodiments of the present application. The embodiment of the present application provides a welding protection cover 100, which is used to cover the end cover 22 of the battery cell 200, and the end cover 22 is provided with an electrode terminal and a liquid injection hole 223. The welding protection cover 100 includes: a cover body 10, the cover body 10 is used to cover the end cover 22 and cover the liquid injection hole, a first avoidance cavity 11 is provided on one side of the cover body 10 in the thickness direction, and the first avoidance cavity 11 is used to avoid the electrode terminal, and the cover body 10 is also provided with a starting welding avoidance groove 12, which is provided on at least one side of the cover body 10 along the width direction of the battery cell 200, and the starting welding avoidance groove 12 is configured as the starting position of welding.

[0054] In the embodiment of the present application, the battery cell 200 may be a secondary battery. A secondary battery refers to a battery cell 200 that can be continuously used by activating active materials by charging after the battery cell 200 is discharged.

[0055] The battery cell 200 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0056] The battery cell 200 includes a shell. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell can be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly 23, and a sealed bag is also included between the shell and the electrode assembly 23, and the sealed bag is used to encapsulate the electrode assembly 23 and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly 23 and the electrolyte. Among them, the shell includes an end cap 22 and a shell 21, the shell 21 is provided with an opening, and the end cap 22 is covered on the opening. The shell 21 may be provided with one or more openings. One or more end caps 22 may also be provided.

[0057] Specifically, the end cap 22 is provided with an electrode terminal, which can be directly connected to the electrode tab or indirectly connected to the electrode tab through a current collecting member. The electrode terminal can be provided on the end cap 22 or on the housing 21 .

[0058] Exemplarily, the welding protection cover 100 is matched with the end cover 22 in shape. The welding protection cover 100 can be a metal cover such as a steel cover, a copper cover or an alloy cover.

[0059] Furthermore, the electrode terminal protrudes from a side of the end cover 22 away from the housing 21 , and the first avoidance cavity 11 is adapted to the shape of the electrode terminal and can accommodate the electrode terminal.

[0060] Exemplarily, the cover body 10 is provided with a starting welding avoidance groove 12 on both sides along the width direction of the battery cell 200, and the number of starting welding avoidance grooves provided on each side is two, and the two starting welding avoidance grooves 12 provided on each side are arranged at intervals. The starting welding avoidance groove 12 is arranged throughout the thickness direction of the cover body 10, and welding can be started from the starting welding avoidance groove 12 as the starting position.

[0061] According to the welding protection cover 100 provided by the present application, when the cover body 10 is covered on the end cover 22 of the battery cell 200, the cover body 10 can cover the injection hole 223 on the end cover 22, and the first avoidance cavity 11 on the cover body 10 can avoid the electrode terminal, so that the electrode terminal can be accommodated in the first avoidance cavity 11. In this way, when the end cover 22 and the shell 21 of the battery cell 200 are welded, it can not only protect the electrode terminal, but also reduce the risk of splashing welding slag entering the battery cell 200 through the injection hole 223 during welding, thereby helping to improve the safety of welding the end cover 22 and the shell 21. In addition, by setting a starting welding avoidance groove 12 on one side of the cover body 10 along the wide band direction of the battery cell 200, so that the cover body 10 avoids the starting welding position of the welding track, the risk of burning the welding protection cover 100 during welding can be reduced, thereby helping to improve the safety of the cover body 10.

[0062] According to some embodiments of the present application, the first avoidance cavity 11 has an opening on a side facing the battery cell 200 , and a chamfer 111 is provided on a circumferential edge of the opening.

[0063] Exemplarily, the cross-section of the first avoidance cavity 11 is rectangular, the opening is arranged toward the end cover 22, and the four sides of the opening are all provided with chamfers 111. The chamfers 111 can be formed by milling the circumferential edge of the opening.

[0064] By providing a chamfer 111 on the circumferential edge of the opening of the first avoidance cavity 11, not only can the electrode terminal be quickly accommodated in the first avoidance cavity 11 when the cover body 10 is covered on the end cover 22 of the battery cell 200, thereby improving the assembly efficiency of the cover body 10, but also the risk of the edge of the electrode terminal being crushed when the cover body 10 is pressed down can be reduced.

[0065] According to some embodiments of the present application, the electrode terminal includes a positive electrode terminal 221 and a negative electrode terminal 222; the number of the first avoidance cavities 11 is two, the two first avoidance cavities 11 are arranged at intervals, and are configured to avoid the positive electrode terminal 221 and the negative electrode terminal 222 respectively.

[0066] Specifically, the positive electrode terminal 221 and the negative electrode terminal 222 are respectively located on both sides of the length direction of the end cover 22. The two first avoidance cavities 11 are arranged at intervals along the length direction of the cover body 10 and correspond to the positions of the positive electrode terminal 221 and the negative electrode terminal 222 respectively.

[0067] When the cover body 10 is covered on the end cover 22, the two first avoidance cavities 11 are respectively covered on the outer peripheral sides of the positive electrode terminal 221 and the negative electrode terminal 222, so as to protect the positive electrode terminal 221 and the negative electrode terminal 222 during the welding process of the end cover 22 and the shell 21, and reduce the risk of spattered welding slag burning the positive electrode terminal 221 and the negative electrode terminal 222, so as to improve the safety of the welding process.

[0068] See also Figure 1 and Figure 3 According to some embodiments of the present application, the end cover 22 is also provided with a pressure relief mechanism 224, and a second avoidance cavity 15 is provided on one side of the cover body 10, and the second avoidance cavity 15 is used to avoid the pressure relief mechanism 224, wherein along the length direction of the battery cell 200, the starting welding avoidance groove 12 is located between the two first avoidance cavities 11.

[0069] The end cover 22 is provided with a pressure relief mechanism 224 , which is used to discharge the internal gas of the battery cell 200 .

[0070] As an example, the pressure relief mechanism 224 can be actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 200 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 200 reaches a predetermined threshold, the pressure relief mechanism 224 performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 200.

[0071] As an example, the pressure relief mechanism 224 may be integrally formed with the end cover 22 .

[0072] As an example, the pressure relief mechanism 224 may also be separately provided and connected to the end cover 22 .

[0073] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 200 can be released. The action produced by the pressure relief mechanism 224 may include but is not limited to: the components in the pressure relief mechanism 224 move to form an exhaust channel, at least a part of the pressure relief mechanism ruptures, breaks, is torn or opened, and so on. When the pressure relief mechanism 224 is actuated, the high-temperature and high-pressure substances inside the battery cell 200 will be discharged from the actuated part as emissions. In this way, the battery cell 200 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0074] By setting a second avoidance cavity 15 on the side of the cover body 10 facing the battery cell 200, when the cover body 10 is covered on the end cover 22 of the battery cell 200, the second avoidance cavity 15 can cover the pressure relief mechanism 224, thereby reducing the risk of the welding slag splashing during welding and burning the pressure relief mechanism 224, thereby further improving the safety of the welding process and improving the stability and safety of the battery cell 200 in later use.

[0075] See also Figure 3 According to some embodiments of the present application, the second avoidance cavity 15 has a plurality of connected inner side walls, and adjacent inner side walls are transitionally connected by using rounded corners 151 .

[0076] Exemplarily, the second avoidance cavity 15 has four inner side walls, and two adjacent inner side walls are transitionally connected via a rounded corner 151 .

[0077] By using rounded corners 151 to transitionally connect the multiple inner walls of the second avoidance cavity 15, the contour shape of the second avoidance cavity 15 is adapted to the contour shape of the pressure relief mechanism, so that the second avoidance cavity 15 can cover the pressure relief mechanism, improve the assembly efficiency of the cover body 10 and the end cover 22, and reduce the risk of damaging the pressure relief mechanism when the cover body 10 is pressed down.

[0078] See also Figure 1 , Figure 2 and Figure 5 , Figure 5 A partial cross-sectional structural diagram of a welding protection cover provided in some embodiments of the present application. According to some embodiments of the present application, a clamping groove 13 is provided on a side of the cover body 10 away from the first avoidance cavity 11, and the clamping groove 13 is used for a clamping mechanism to clamp the cover body 10.

[0079] Exemplarily, the clamping groove 13 extends along the length direction of the cover body 10 , and a notch is formed on the clamping groove 13 and on a side of the cover body 10 facing away from the battery cell 200 for the clamping mechanism to extend into the clamping groove 13 .

[0080] See also Figure 5In some embodiments, the end of the clamping groove 13 away from the clamping notch adopts an arc transition.

[0081] By providing a clamping groove 13 on the side of the cover body 10 away from the first avoidance cavity 11, the clamping claws of the clamping mechanism can be inserted into and clamp the cover body 10, thereby improving the disassembly and assembly efficiency of the welding protection cover.

[0082] See also Figure 1 , Figure 2 and Figure 4 , Figure 4 A structural schematic diagram of another perspective of a welding protection cover provided in some embodiments of the present application. According to some embodiments of the present application, a positioning hole 14 is further provided on the side of the cover body 10 away from the first avoidance cavity 11, and the positioning hole 14 is spaced apart from the clamping groove 13 and is configured to provide a positioning connection between the clamping mechanism and the cover body 10.

[0083] Exemplarily, the clamping mechanism is provided with a positioning column for inserting into the positioning hole 14 .

[0084] When the clamping mechanism clamps the cover body 10, it can first be inserted into the positioning hole 14 to be positioned and connected with the cover body 10, and then the clamping claws are inserted into the clamping groove 13. By applying a clamping force to the cover body 10, the purpose of quickly moving the cover body 10 is achieved, which helps to further improve the disassembly and assembly efficiency of the welding protection cover 100 and the end cover 22.

[0085] See also Figure 1 and Figure 2 According to some embodiments of the present application, a clamping notch is provided on the side of the cover body 10 away from the first avoidance cavity 11, and the clamping groove 13 is recessed into the cover body 10 along the length direction of the battery cell 200 and extends along the length direction of the battery cell 200, and the clamping notch is connected to the clamping groove 13.

[0086] In the above technical solution, the clamping notch is used for the clamping mechanism to pass through and penetrate into the clamping groove 13, and move along the extension direction of the clamping groove 13 until it can clamp the fixed cover body 10, thereby clamping and moving the welding protection cover 100. The structure and principle are relatively simple and easy to implement.

[0087] See also Figure 2 According to some embodiments of the present application, the number of the clamping slots 13 is two, and the two clamping slots 13 are spaced apart and symmetrically arranged; the number of the positioning holes 14 is two, and the two positioning holes 14 are respectively arranged close to the two clamping slots 13.

[0088] By setting the number of clamping grooves 13 and positioning holes 14 to two, the clamping mechanism is first positioned and connected to the cover body 10 through the two positioning holes 14, and then inserted into the two clamping grooves 13 to apply a clamping force to the cover body 10 to clamp the cover body 10, so that the force on the cover body 10 can be more uniform, thereby improving the stability of the cover body 10 during installation and disassembly, and can further improve the disassembly efficiency of the cover body 10 and the end cover 22.

[0089] According to some embodiments of the present application, along the direction from the cover body 10 to the end cover 22 , the projection of the cover body 10 on the end cover 22 is located inside the end cover 22 .

[0090] That is, the outer contour dimension of the cover body 10 is not larger than the outer contour dimension of the end cover 22. Thus, when the cover body 10 is covered on the end cover 22, there is no gap between the cover body 10 and the end cover 22. Thus, welding slag dust generated during the welding process cannot enter the covering area between the cover body 10 and the end cover 22, thereby further reducing the possibility of burning or contamination of the electrode terminal, the pressure relief mechanism and the injection hole, thereby improving the safety during welding.

[0091] According to some embodiments of the present application, the cover body 10 includes a steel cover, and a surface of the steel cover is provided with a chrome-plated layer or a ceramic coating.

[0092] The steel cover has high hardness and rigidity, which can provide good support and help improve the stability of the cover body 10 in protecting the electrode terminals and the pressure relief mechanism on the end cover 22. A chrome plating layer or a ceramic coating is provided on the surface of the cover body 10. The chrome plating layer or the ceramic coating has good wear resistance and high temperature resistance, and can reduce the risk of welding slag sticking to the cover body 10 during welding, and can further improve the safety of the welding process.

[0093] According to some embodiments of the present application, see Figures 1 to 5The present application provides a welding protection cover 100, which is used to cover the end cover 22 of a battery cell 200. The end cover 22 is provided with a positive electrode terminal 221, a negative electrode terminal 222, a pressure relief mechanism and a liquid injection hole. The welding protection cover 100 includes: a cover body 10, and a first avoidance cavity 11 and a second avoidance cavity 15 are provided on the side of the cover facing the battery cell 200. The number of the first avoidance cavities 11 is two, and the two first avoidance cavities 11 are respectively used to avoid the positive electrode terminal 221 and the negative electrode terminal 222 when the cover body 10 is covered on the end cover 22. The second avoidance cavity 15 is provided between the two first avoidance cavities 11, and is used to avoid the pressure relief mechanism. When the cover body 10 is covered on the end cover 22, it can cover the liquid injection hole. Two starting welding avoidance grooves 12 are respectively provided on both sides of the cover body 10 along the width direction of the battery cell 200, and the starting welding avoidance grooves 12 penetrate both sides of the cover body 10 in the thickness direction. Two clamping grooves 13 are provided on the side of the cover body 10 away from the first avoidance cavity 11. The two clamping grooves 13 are spaced apart and symmetrically arranged. A positioning hole 14 is provided at a corresponding interval for each clamping groove 13. The positioning hole 14 is used for positioning and connecting with the clamping mechanism, and the clamping groove 13 is used for the clamping mechanism to extend into to clamp the cover body 10. The surface of the cover body 10 is coated with a chrome-plated layer or a ceramic coating. By adopting the above technical solution, not only is it convenient to weld the end cover 22 and the shell 21, but it can also reduce the risk of spattered welding slag ablating the electrode terminal, the pressure relief mechanism and the injection hole when the end cover 22 and the shell 21 of the battery cell 200 are welded, and it can also reduce the occurrence of spattered welding slag entering the interior of the battery cell 200 through the injection hole, thereby improving the stability and safety of the battery cell 200 in later use.

[0094] According to some embodiments of the present application, the present application also provides a welding device, including: a welding device, a clamping mechanism and a welding protection cover 100 as any one of the above embodiments, the welding protection cover is used to cover the end cover of the battery cell, the clamping mechanism is used to clamp and move the welding protection cover 100, and the welding device is used to weld the shell and the end cover of the battery cell.

[0095] According to the welding equipment provided by the present application, since it includes the welding protection cover of any one of the embodiments of the first aspect, it has the technical effects of any of the above-mentioned embodiments, which will not be repeated here.

[0096] According to some embodiments of the present application, the present application also provides a battery production line, comprising: a transmission device and a welding device as described in the above embodiments, wherein the transmission device is used to transmit battery cells, and the welding device is used to weld the transmitted battery cells.

[0097] According to the battery production line provided in the present application, the transmission device continuously transmits battery cells, so that the multiple battery cells transmitted can be welded one by one by using the welding device. Since the battery production line provided in this embodiment includes the welding equipment described in the above embodiments, it also has the technical effects of any of the above embodiments, which will not be repeated here.

[0098] According to some embodiments of the present application, when the cover body 10 is covered on the end cover 22 and covers the injection hole 223 of the end cover 22 , along the direction from the cover body 10 to the end cover 22 , the projection of the cover body 10 on the end cover 22 is located inside the end cover 22 .

[0099] That is, the outer contour dimension of the cover body 10 is not larger than the outer contour dimension of the end cover 22. In this way, when the cover body 10 is covered on the end cover 22, there is no gap between the cover body 10 and the end cover 22, and the welding slag dust generated during the welding process cannot enter the covering area between the cover body 10 and the end cover 22, thereby further reducing the possibility of burning or contamination of the electrode terminal, the pressure relief mechanism 224 and the injection hole 223, thereby improving the safety during welding.

[0100] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A welding protection cover, used to cover the end cover of a battery cell, wherein the end cover is provided with an electrode terminal and a liquid injection hole, characterized in that: The welding protection cover comprises: A cover body, wherein the cover body is used to cover the end cover and cover the injection hole, the cover body has a first avoidance cavity, the first avoidance cavity is arranged on one side of the cover body in the thickness direction, the first avoidance cavity is used to avoid the electrode terminal, the cover body also has a starting welding avoidance groove, the starting welding avoidance groove is arranged on at least one side of the cover body along the width direction of the battery cell, and the starting welding avoidance groove is configured as the starting position of welding.

2. The welding protection cover according to claim 1, characterized in that: The first avoidance cavity has an opening on a side facing the battery cell, and a circumferential edge of the opening is provided with a chamfer.

3. The welding protection cover according to claim 1 or 2, characterized in that: The electrode terminal includes a positive electrode terminal and a negative electrode terminal. The number of the first avoidance cavities is two. The two first avoidance cavities are arranged at intervals and are configured to avoid the positive electrode terminal and the negative electrode terminal respectively.

4. The welding protection cover according to claim 2, characterized in that: The end cover is also provided with a pressure relief mechanism, and one side of the cover body is also provided with a second avoidance cavity, the second avoidance cavity is used to avoid the pressure relief mechanism, wherein along the length direction of the battery cell, the starting welding avoidance groove is located between the first avoidance cavity and the second avoidance cavity.

5. The welding protection cover according to claim 4, characterized in that: The second avoidance cavity has a plurality of connected inner side walls, and adjacent inner side walls are connected by rounded transition.

6. The welding protection cover according to claim 1 or 2, characterized in that: A clamping groove is provided on one side of the cover body away from the first avoidance cavity, and the clamping groove is configured to allow a clamping mechanism to clamp the cover body.

7. The welding protection cover according to claim 6, characterized in that: An opening is provided on one side of the cover body away from the first avoidance cavity, the clamping groove is recessed into the cover body along the length direction of the battery cell and extends along the length direction of the battery cell, and the opening is communicated with the clamping groove.

8. The welding protection cover according to claim 6, characterized in that: A positioning hole is further provided on the side of the cover body away from the first avoidance cavity. The positioning hole is spaced apart from the clamping groove and is configured to allow the clamping mechanism to be positioned and connected to the cover body.

9. The welding protection cover according to claim 8, characterized in that: The number of the clamping slots is two, and the two clamping slots are spaced apart and symmetrically arranged; The number of the positioning holes is two, and the two positioning holes are respectively arranged close to the two clamping grooves.

10. The welding protection cover according to claim 1 or 2, characterized in that: The cover body comprises a steel cover, and a chrome-plated layer or a ceramic coating is provided on the surface of the steel cover.

11. A welding device, characterized in that: include: Welding equipment; Clamping mechanism; and The welding protection cover according to any one of claims 1 to 10, wherein the welding protection cover is used to cover the end cover of the battery cell, the clamping mechanism is used to clamp and move the welding protection cover, and the welding device is used to weld the shell of the battery cell to the end cover.

12. A battery production line, characterized in that: include: A transmission device for transmitting the end cap and the shell of the battery cell; and The welding apparatus as claimed in claim 11.

13. The battery production line according to claim 12, characterized in that: When the cover body is disposed on the end cover and covers the liquid injection hole of the end cover, along the direction from the cover body to the end cover, the projection of the cover body on the end cover is located inside the end cover.

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