Battery cell, method for manufacturing battery cell, battery device, and electric device

Abstract

The application relates to a battery monomer, a manufacturing method of the battery monomer, a battery device and an electric equipment. The battery monomer comprises an electrode assembly and a protection piece. The electrode assembly comprises a tab, the tab has a first welding area and a peripheral area arranged around the first welding area. The protection piece is arranged on the tab and covers at least part of the peripheral area. A window for exposing the first welding area is arranged on the protection piece. The risk of cracking of the tab can be reduced, and the reliability of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a manufacturing method of the battery monomer, a battery device and a power consumption equipment. BACKGROUND

[0002] The tab is a metal conductor for leading out the positive and negative electrodes of the electrode assembly, and plays an important role in current overcurrent and shunt. The tab is one of the important components of the battery monomer. Therefore, how to reduce the risk of tab cracking is a technical problem to be solved in the battery field. SUMMARY

[0003] Therefore, it is necessary to provide a battery monomer, a manufacturing method of the battery monomer, a battery device and a power consumption equipment to reduce the risk of tab cracking and improve the reliability of the battery monomer.

[0004] According to a first aspect of the present application, a battery monomer is provided, which comprises an electrode assembly and a protective member. The electrode assembly comprises a tab, the tab has a first welding area and a peripheral area arranged around the first welding area. The protective member is arranged on the tab and covers at least part of the peripheral area. The protective member is provided with a window for exposing the first welding area.

[0005] In the technical solution of the present application, the peripheral area of the tab can be protected by the protective member before welding, and the first welding area of the tab is exposed by the window on the protective member, so that the tab can be welded subsequently, and the occurrence of tab cracking caused by welding can be reduced. In addition, the occurrence of tab cracking of the intermediate member of the battery monomer during transportation can be reduced, the risk of tab cracking can be reduced, and the reliability of the battery monomer can be improved.

[0006] In one of the embodiments, the orthographic projection of the first welding area in a reference plane is located within the orthographic projection of the window in the reference plane, and the reference plane is perpendicular to the thickness direction of the tab.

[0007] It can be understood that the first welding area is completely exposed through the window, which facilitates the welding of the first welding area of the tab with the to-be-welded member, and also reduces the probability of welding to the protective member, thereby reducing the probability of sticking caused by welding to the protective member during welding.

[0008] In one of the embodiments, the material of the protective member comprises an insulating material.

[0009] In this way, the peripheral area of the tab can be protected by the protective member, and the tab and the welding head used for welding can be electrically isolated through the protective member, thereby improving the reliability of the battery monomer.

[0010] In one of the embodiments, the protective member is bonded to the tab.

[0011] The protection member can be manually or by a taping mechanism bonded to the tab, improving the convenience of setting the protection member.

[0012] In one of the embodiments, the peripheral region surrounds the first welding region.

[0013] In this way, the first welding region of the tab can be welded to the to-be-welded member through the window, while the protection member is arranged around the first welding region, thereby better utilizing the protection member to protect the peripheral region, better reducing the risk of tab cracking, and thereby improving the reliability of the battery monomer.

[0014] In one of the embodiments, the thickness of the tab is D, and the thickness of the protection member is 0.1xD-0.2xD.

[0015] The thickness of the protection member needs to be controlled to reduce the gap between the welding head and the first welding region of the tab caused by the excessively thick protection member, and also to reduce the friction between the welding head and the tab, and to better protect the tab with a thick enough protection member.

[0016] In one of the embodiments, the electrode assembly further comprises an electrode assembly body, the electrode assembly body is provided with a tab on at least one side along a first direction, and the protection member further extends to cover at least one side of the tab along a second direction. The first direction and the second direction are perpendicular to each other and perpendicular to the thickness direction of the tab.

[0017] In this way, the protection member can be used to better protect at least one side of the tab along the second direction, better reducing the risk of tab cracking, and thereby improving the reliability of the battery monomer.

[0018] In one of the embodiments, along the thickness direction of the tab, the tab has a first side and a second side arranged oppositely, the protection member comprises a first protection layer and a second protection layer, the first protection layer is arranged on the surface of the first side of the tab, the second protection layer is arranged on the surface of the second side of the tab, and the first protection layer and the second protection layer are connected along the thickness direction of the tab. In the protection member, at least the first protection layer covers at least part of the peripheral region, and is provided with a window.

[0019] In this way, at least part of the peripheral region can be protected by the protection member, and the tab can be welded to the to-be-welded member through the window on the first side.

[0020] In one of the embodiments, the first protection layer and the second protection layer are connected along the thickness direction of the tab on the same side along the second direction. The first protection layer and the second protection layer are respectively provided with a window.

[0021] In one aspect, the protective member can be used to protect at least part of the peripheral region, and facilitate the welding head to weld the tab with the to-be-welded member through the window located on the first side; in another aspect, the second protective layer is arranged on the second side of the tab and the welding seat for supporting the tab, and the second protective layer is provided with a window, which reduces the contact between the first welding area of the tab and the second protective layer, and further reduces the sticking of the second protective layer due to high-temperature melting, thereby improving the welding reliability of the battery monomer.

[0022] In one embodiment, the electrode assembly body has a third side located on the same side as the first side along the thickness direction of the tab, and a fourth side located on the opposite side of the third side. A part of the first protective layer is arranged on the first side of the tab, and another part of the first protective layer extends to the third side of the electrode assembly body. A part of the second protective layer is arranged on the second side of the tab, and another part of the second protective layer extends to the fourth side of the electrode assembly body.

[0023] In this way, the first protective layer and the second protective layer can be used to protect the opposite sides of the root of the tab along the thickness direction of the tab, which can better reduce the risk of tab cracking, thereby improving the reliability of the battery monomer.

[0024] In one embodiment, the tab has a first side along the thickness direction of the tab, and the protective member is arranged on at least part of the surface of the first side of the tab, and the window is arranged on at least part of the part of the protective member arranged on the first side.

[0025] It can be understood that the part of the protective member arranged on the first side covers at least part of the peripheral region, so that the protective member can be used to separate at least part of the peripheral region from the welding head used to weld the tab, thereby better protecting the tab and better reducing the risk of tab cracking, thereby improving the reliability of the battery monomer.

[0026] In one embodiment, the electrode assembly further comprises an electrode assembly body, the electrode assembly body is provided with a tab on at least one side along the first direction, and along the thickness direction of the tab, the electrode assembly body has a third side located on the same side as the first side, a part of the protective member is arranged on the first side of the tab and covers at least part of the peripheral region, and another part of the protective member extends to the third side of the electrode assembly body.

[0027] In this way, a part of the protective member is arranged on the first side of the tab and covers at least part of the peripheral region, and is provided with a window to facilitate the first welding area to be welded with the to-be-welded member, and another part of the protective member extends to the third side of the electrode assembly body, so that the other part of the protective member can cover the first side of the root of the tab, and the root of the tab can also be protected by the protective member, which can better reduce the risk of tab cracking, thereby improving the reliability of the battery monomer.

[0028] In one of the embodiments, the protection member includes a first portion arranged on the first side of the tab, a second portion arranged on the third side of the electrode assembly body, a third portion connected to the first portion and the second portion, and a fourth portion. The window is arranged on the first portion. The first portion is provided with the fourth portion on at least one side in the second direction, and the fourth portion protrudes from the tab in the second direction. Herein, the first direction and the second direction are perpendicular to each other and both are perpendicular to the thickness direction of the tab.

[0029] In one of the embodiments, the battery cell further includes a to-be-welded member, and the tab is welded to the to-be-welded member by means of the window.

[0030] Before the tab is welded, the peripheral area of the tab can be protected by the protection member, and the first welding area of the tab can be exposed by the window on the protection member, so that the tab can be welded subsequently, the risk of cracking of the tab can be reduced, and the reliability of the battery cell can be improved.

[0031] According to a second aspect of the present application, a manufacturing method of a battery cell is provided, including: providing an electrode assembly and a protection member; wherein the electrode assembly includes a tab, the tab has a first welding area and a peripheral area arranged around the first welding area; arranging the protection member on the tab and covering at least part of the peripheral area; and the protection member is provided with a window for exposing the first welding area.

[0032] In this way, the risk of cracking of the tab can be reduced, and the reliability of the battery cell can be improved.

[0033] In one of the embodiments, the manufacturing method of the battery cell further includes: passing the welding teeth of the welding head through the window to weld the tab and the to-be-welded member.

[0034] Before the tab and the to-be-welded member are welded by the welding head, the peripheral area of the tab can be protected by the protection member, the risk of cracking of the tab can be reduced, and the reliability of the battery cell can be improved.

[0035] In one of the embodiments, after the protection member is arranged on the tab and covers at least part of the peripheral area, before the welding teeth of the welding head pass through the window to weld the tab and the to-be-welded member, the method further includes: judging whether the protection member meets a first condition, and if not, adjusting the position of the electrode assembly and / or the protection member until the protection member meets the first condition. Herein, the welding head has a second welding area corresponding to the first welding area, and the first condition includes: the normal projection of the second welding area of the welding head in a reference plane is located within the range of the normal projection of the window in the reference plane, and the reference plane is perpendicular to the thickness direction of the tab.

[0036] In this way, all the welding teeth of the welding head can pass through the window to weld the tab and the to-be-welded member together, while the probability of the welding teeth contacting the protection member can be reduced, and the welding yield of the tab can be improved.

[0037] In one of the embodiments, the judging whether the protection meets the first condition specifically includes: obtaining a first image of the tab provided with the protection; obtaining first position information of the protection according to the first image; obtaining second position information of the welding head; and judging whether the protection meets the first condition according to the first position information of the protection and the second position information of the welding head.

[0038] The first position information of the protection can be used to obtain the position information of the window, and then the position information of the window and the second position information of the welding head are compared to judge whether the protection meets the first condition.

[0039] In one of the embodiments, the welding head further has a holding area surrounding the second welding area; and the welding head includes a plurality of welding teeth arranged at the second welding area. The holding area is used to hold the side of the protection facing the welding head along the thickness direction of the tab, and the window has two first edges oppositely arranged along a first direction and two second edges oppositely arranged along a second direction. The inner side of the holding area has two third edges oppositely arranged along the first direction and two fourth edges oppositely arranged along the second direction. The first edges are located outside the third edges along the first direction, and the second edges are located outside the fourth edges along the second direction. The first condition further includes that the first edges and the third edges on the same side have a first preset interval along the first direction, and the second edges and the fourth edges on the same side have a second preset interval along the second direction. The first direction and the second direction are perpendicular to each other and perpendicular to the thickness direction of the tab.

[0040] In this way, the inner side of the holding area is located within the range of the window, which facilitates all the welding teeth of the welding head to pass through the window, reduces the contact between the welding teeth of the welding head and the protection, and thus reduces the sticking of the protection due to high temperature melting during welding, improves the welding reliability of the tab, and also protects the tab well. In addition, since the first condition further includes that the first edges and the third edges on the same side have a first preset interval along the first direction, and the second edges and the fourth edges on the same side have a second preset interval along the second direction, all the welding teeth of the welding head can pass through the window while giving the welding teeth of the welding head a certain space for movement, which reduces the probability of the welding teeth of the welding head contacting the protection during welding vibration, and thus improves the welding reliability of the tab better.

[0041] In one of the embodiments, the size of the holding area along the first direction is W, the size of the holding area along the second direction is L, the first preset interval is 0.2×W to 0.5×W, and the second preset interval is 0.2×L to 0.5×L.

[0042] The peripheral area covered by the protective member corresponds to the holding area of the welding head, and thus the first preset distance and the second preset distance are proportional to the size of the holding area of the welding head. The larger the size of the holding area, the larger the area covered by the protective member. In addition, the protective member should be as close as possible to the inner side edge of the holding area to facilitate better protection of the tab. Moreover, the protective member should not contact the welding head as much as possible to affect the welding effect. Therefore, the first preset distance and the second preset distance are both set in a suitable range, for example, the first preset distance is set to 0.2×W to 0.5×W, and the second preset distance is set to 0.2×L to 0.5×L. In this way, all the teeth of the welding head can pass through the window while giving the teeth of the welding head a certain space for movement, reducing the probability of the teeth of the welding head contacting the protective member in welding vibration, and thus the welding reliability of the tab can be better improved.

[0043] In one of the embodiments, the welding head is configured to reciprocate within a preset angle about an axis parallel to the second direction; the first preset distance is 0.3×W to 0.5×W; and the second preset distance is 0.2×L to 0.4×L.

[0044] In the process of welding operation using the welding head, a certain welding power is applied to the welding head, so that the welding head will produce mechanical vibration. If the welding head is a longitudinal welding head, it will reciprocate within a preset angle about an axis parallel to the second direction, so that the welding head needs a larger space for movement in the first direction. Therefore, the first preset distance is set to 0.3×W to 0.5×W, and the second preset distance is set to 0.2×L to 0.4×L, which is more conducive to the space requirement of the welding head during the welding operation, reduces the probability of the teeth of the welding head contacting the protective member in welding vibration, and also enables all the teeth of the welding head to pass through the window.

[0045] In one of the embodiments, the welding head is configured to reciprocate within a preset angle about an axis parallel to the first direction; the first preset distance is 0.2×W to 0.4×W; and the second preset distance is 0.3×L to 0.5×L.

[0046] In the process of welding operation using the welding head, a certain welding power is applied to the welding head, so that the welding head will produce mechanical vibration. If the welding head is a longitudinal welding head, it will reciprocate within a preset angle about an axis parallel to the second direction, so that the welding head needs a larger space for movement in the first direction. Therefore, the first preset distance is set to 0.3×W to 0.5×W, and the second preset distance is set to 0.2×L to 0.4×L, which is more conducive to the space requirement of the welding head during the welding operation, reduces the probability of the teeth of the welding head contacting the protective member in welding vibration, and also enables all the teeth of the welding head to pass through the window.

[0047] In one of the embodiments, the first preset interval is 0.1mm-0.5mm, and the second preset interval is 0.1mm-0.5mm.

[0048] In this way, the first preset interval and the second preset interval are set in a proper range, for example, both are set in the range of 0.1mm-0.5mm, so that the deviation between the window on the protection member and the welding position of the welding head can be reduced, the smaller the first preset interval and the second preset interval, the smaller the deviation, which is beneficial to the situation that all the welding teeth of the welding head pass through the window at the same time, and also gives the welding teeth of the welding head a certain activity space, reduces the probability that the welding teeth of the welding head contact the protection member in the welding vibration, and also reduces the probability that the protection member is stuck, thereby the welding reliability of the tab can be better improved.

[0049] In one of the embodiments, the protection member is arranged on the tab and covers at least part of the peripheral area, and the method for manufacturing the battery cell further comprises: obtaining a second image of the tab; determining whether the relative position relationship between the protection member and the tab meets a second condition according to the second image, and if not, adjusting the position of the protection member and / or the tab until the relative position relationship between the protection member and the tab meets the second condition. The second condition comprises that the orthographic projection of the first welding area in the reference plane is located in the range of the orthographic projection of the window in the reference plane.

[0050] The two-dimensional coordinate information of the first welding area can be obtained according to the second image of the tab, and whether the orthographic projection of the first welding area in the reference plane is located in the range of the orthographic projection of the window in the reference plane can be determined by comparing the two-dimensional coordinate information of the protection member and the two-dimensional coordinate information of the first welding area, so as to determine whether the protection member is correctly positioned on the tab, and the accuracy of the protection member being positioned on the tab is improved.

[0051] According to a third aspect of the present application, a method for manufacturing a battery cell is provided, comprising: providing a tab, a protection member and an electrode assembly body; the tab has a first welding area and a peripheral area arranged around the first welding area; the protection member is arranged on the tab and covers at least part of the peripheral area; the protection member is provided with a window exposing the first welding area; and the tab provided with the protection member is welded together with the electrode assembly body through the window.

[0052] In this way, before the tab is welded to the electrode assembly body, at least part of the peripheral area of the tab is protected by the protection member, so as to reduce the risk of cracking of the tab.

[0053] According to a fourth aspect of the present application, a battery device is provided, comprising the battery cell of any one of the above embodiments or the battery cell prepared by the method for manufacturing the battery cell of any one of the above embodiments.

[0054] According to a fifth aspect of the present application, a use electric device is provided, comprising the above battery device.

[0055] The above description is merely a summary of the application technical solutions, in order to make the technical means of the application more clearly understood, and can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0056] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the application. Moreover, the same reference numerals in all the drawings represent the same or similar elements. In the drawings:

[0057] Figure 1 A structural schematic diagram of a vehicle according to an embodiment of the application is shown.

[0058] Figure 2 A structural schematic diagram of a battery device according to an embodiment of the application is shown.

[0059] Figure 3 A partial structural schematic diagram of a battery cell according to an embodiment of the application is shown.

[0060] Figure 4 A side view of a partial structure of a battery cell according to an embodiment of the application is shown.

[0061] Figure 5 An enlarged schematic diagram of A of Figure 4 is shown.

[0062] Figure 6 A side view of a partial structure of a battery cell according to another embodiment of the application is shown.

[0063] Figure 7 An enlarged schematic diagram of B of Figure 6 is shown.

[0064] Figure 8 A perspective view of a partial structure of a battery cell according to an embodiment of the application is shown.

[0065] Figure 9 An enlarged schematic diagram of C of Figure 8 is shown.

[0066] Figure 10 A structural schematic diagram of a first image acquisition mechanism, an electrode assembly and a protective member according to an embodiment of the application is shown.

[0067] Figure 11 A structural schematic diagram of a third image acquisition mechanism and an electrode assembly according to an embodiment of the application is shown.

[0068] Reference signs: 1, vehicle; 10, battery device; 100, battery cell; 110, electrode assembly; 111, tab; 1111, first welding area; 1112, peripheral area; S1, first side; S2, second side; 112, electrode assembly body; 120, protector; 121, first protective layer; 122, second protective layer; 1201, first portion; 1202, second portion; 1203, third portion; 1204, fourth portion; K, window; K1, first edge; K2, second edge; 200, box shell; 210, box cover; 220, box body; 300, first image acquisition mechanism; 400, third image acquisition mechanism; 20, welding head; 21, second welding area; 22, pressure holding area; 221, third edge; 222, fourth edge; 30, motor; 40, controller. DETAILED DESCRIPTION

[0069] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0070] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0071] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0072] In this application, unless specifically defined otherwise, if there appears the terms "mount", "connect", "connection", "fix", and the like, these terms should be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0073] In this application, unless specifically defined otherwise, if there appears the terms "mount", "connect", "connection", "fix", and the like, these terms should be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0074] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation.

[0075] In the related art, after the tab welding, a layer of adhesive tape is usually pasted on the surface of the tab to protect the tab, so as to prevent the tab from cracking in the subsequent transportation process. However, the tab also has a high risk of cracking during the welding process.

[0076] In order to solve the above technical problems, the application designs a battery monomer, a battery monomer manufacturing method, a battery device and an electric equipment. Before the tab welding, the protection piece is used to protect the tab, thereby reducing the risk of tab cracking.

[0077] The battery monomer and / or battery device disclosed in the embodiments of the present application can be used in, but are not limited to, electric equipment such as vehicles, ships or aircrafts. The electric equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, electric vehicles, electric cars, ships and spacecrafts, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The spacecrafts can include airplanes, rockets, space shuttles and spaceships, etc. The power supply system of the electric equipment can be composed of the battery monomer and / or battery device disclosed in the present application, so as to facilitate the power driving of the electric equipment and improve the service life of the electric equipment.

[0078] Figure 1 A structural schematic diagram of a vehicle 1 is shown, which can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range-extended car, etc. The vehicle 1 is internally provided with a battery device 10. For example, the battery device 10 can be arranged at the bottom, the front or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power source of the vehicle 1, which is used for the working power demand of the circuit system of the vehicle 1, such as the starting, navigation and running of the vehicle 1. In another embodiment of the present application, the battery device 10 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, which replaces or partially replaces the fuel or natural gas to provide driving force for the vehicle 1.

[0079] The vehicle 1 can also be internally provided with a motor 30 and a controller 40, which is used to control the power supply of the battery device 10 to the motor 30, such as the working power demand of the vehicle 1 during starting, navigation and running. Figure 2 A structural schematic diagram of the battery device 10 is shown.

[0080] The battery device 10 includes at least one battery monomer 100. In order to meet different power requirements, the battery device 10 can include a plurality of battery monomers 100, and the battery monomer 100 refers to the smallest unit of the battery device 10. The plurality of battery monomers 100 can be connected in series and / or in parallel through electrode terminals to be applied to various application occasions. The battery device 10 mentioned in the present application includes a battery module or a battery pack. Among them, the plurality of battery monomers 100 can be connected in series or in parallel or in a mixed manner. The mixed connection refers to the mixture of series connection and parallel connection. The battery device 10 can also be referred to as a battery pack. In the embodiments of the present application, the plurality of battery monomers 100 can directly constitute a battery pack, or can first constitute a battery module, and then the battery module constitutes a battery pack.

[0081] As shown in FIG. 1, the battery device 10 includes a plurality of battery monomers 100. The plurality of battery monomers 100 can be connected in series or in parallel or in a mixed manner. The mixed connection refers to the mixture of series connection and parallel connection. The battery device 10 can also be referred to as a battery pack. Figure 2As shown, the battery device 10 can further include a box shell 200, all the battery monomers 100 are accommodated in the box shell 200, in particular, the box shell 200 can include a box body 220 and a box cover 210, the box cover 210 is detachably connected to the box body 220, so that all the battery monomers 100 are accommodated in the box shell 200.

[0082] Figure 3 A partial structure schematic diagram of the battery monomer 100 of an embodiment of the application is shown, Figure 4 A side view of the partial structure of the battery monomer 100 of an embodiment of the application is shown, Figure 5 An enlarged schematic diagram of A of the battery monomer 100 is shown, Figure 4 An enlarged schematic diagram of A of the battery monomer 100 is shown.

[0083] Please refer to Figures 3-5 An embodiment of the application provides a battery monomer 100, which comprises an electrode assembly 110 and a protection piece 120, the electrode assembly 110 comprises a tab 111, the tab 111 has a first welding area 1111, and a peripheral area 1112 arranged around the first welding area 1111.

[0084] The first welding area 1111 refers to an area on the tab 111 for welding with a to-be-welded piece.

[0085] The to-be-welded piece can be an adapter or an electrode assembly body 112, wherein the electrode assembly body 112 is a part of the electrode assembly 110 except the tab 111, and the adapter is a component on the battery monomer 100 for connecting the tab 111 and a pole of the battery monomer 100.

[0086] The peripheral area 1112 refers to an area on the tab 111 arranged around the first welding area 1111.

[0087] The protection piece 120 is arranged on the tab 111 and covers at least part of the peripheral area 1112, and the protection piece 120 is provided with a window K for exposing the first welding area 1111.

[0088] The protection piece 120 is a component arranged on the tab 111 before the tab 111 is welded with the to-be-welded piece and used for protecting the tab 111.

[0089] The protection piece 120 can cover all of the peripheral area 1112 or a part of the peripheral area 1112, as long as at least part of the first welding area 1111 is exposed.

[0090] The window K refers to an opening on the protection piece 120 for exposing at least part of the first welding area 1111, so that at least part of the first welding area 1111 of the tab 111 is exposed, thereby facilitating the first welding area 1111 of the tab 111 to be welded with the to-be-welded piece.

[0091] The battery cell 100 further comprises a shell (not shown in the figure), and the electrode assembly 110 is arranged in the shell to protect the electrode assembly 110. The shell comprises a shell body and a top cover connected to the shell body to assemble the electrode assembly 110 into the shell, and the pole of the battery cell 100 is arranged on the top cover to facilitate the connection of the tab 111 to the pole of the battery cell 100 through the to-be-welded member, and then the positive and negative electrodes of the electrode assembly 110 are led out through the corresponding poles.

[0092] Before the tab 111 is welded, the peripheral area 1112 of the tab 111 can be protected by the protection member 120, and the first welding area 1111 of the tab 111 is exposed through the window K on the protection member 120, so as to facilitate the subsequent welding of the tab 111 and reduce the occurrence of cracking of the tab 111 caused by welding of the tab 111. In addition, the cracking of the tab 111 during the subsequent transportation of the intermediate member of the battery cell 100 can be reduced, the risk of cracking of the tab 111 can be reduced, and the reliability of the battery cell 100 can be improved.

[0093] In some embodiments, the first welding area 1111 has a normal projection in a reference plane, and the normal projection of the window K in the reference plane is within the range of the normal projection of the first welding area 1111 in the reference plane, and the reference plane is perpendicular to the thickness direction of the tab 111.

[0094] It can be understood that the first welding area 1111 is completely exposed through the window K, which facilitates the welding of the first welding area 1111 of the tab 111 and the to-be-welded member, and also reduces the probability of being welded to the protection member 120, thereby reducing the probability of sticking caused by welding to the protection member 120 during the welding process.

[0095] In some embodiments, the material of the protection member 120 comprises an insulating material.

[0096] For example, the protection member 120 can be blue film glue, black glue (LP glue), insulating glue or high-temperature glue.

[0097] The protection member 120 needs to have good insulation, high-temperature resistance, chemical stability and good adhesion, so as to better protect the tab 111 during the subsequent welding process, flow process or other processes.

[0098] In this way, the protection member 120 can protect the peripheral area 1112 of the tab 111, and at the same time, the tab 111 and the welding head 20 used for welding can be electrically isolated through the protection member 120, thereby improving the reliability of the battery cell 100.

[0099] In some embodiments, the protection member 120 is bonded to the tab 111.

[0100] The protection piece 120 can be manually adhered to the tab 111 or adhered to the tab 111 by using a gluing mechanism, so as to improve the convenience of arranging the protection piece 120.

[0101] In some embodiments, the peripheral region 1112 is arranged around the first welding region 1111.

[0102] In this way, the first welding region 1111 of the tab 111 can be welded to the to-be-welded piece through the window K, and at the same time, the protection piece 120 can be arranged around the first welding region 1111, so as to better protect the peripheral region 1112 by the protection piece 120, and the risk of cracking of the tab 111 can be better reduced, and thus the reliability of the battery monomer 100 can be improved.

[0103] In some embodiments, the thickness of the tab 111 is D, and the thickness of the protection piece 120 is 0.1×D to 0.2×D.

[0104] For example, the thickness of the protection piece 120 is 0.1×D, 0.15×D or 0.2×D.

[0105] The thickness of the protection piece 120 needs to be controlled, so as to reduce the gap between the welding head 20 and the first welding region 1111 of the tab 111 due to the too thick protection piece 120, and the friction between the welding head 20 and the tab 111 can be reduced, and the tab 111 can be well protected by the protection piece 120 with sufficient thickness.

[0106] In some embodiments, the electrode assembly 110 further includes an electrode assembly body 112, and the tab 111 is arranged on at least one side of the electrode assembly body 112 along a first direction F1. The protection piece 120 further extends to cover at least one side of the tab 111 along a second direction F2. The first direction F1 and the second direction F2 are perpendicular to each other and are both perpendicular to the thickness direction of the tab 111.

[0107] The protection piece 120 can cover one side of the tab 111 along the second direction F2, or the protection piece 120 can cover opposite sides of the tab 111 along the second direction F2.

[0108] One of the first direction F1 and the second direction F2 is parallel to the length direction of the electrode assembly body 112, the other of the first direction F1 and the second direction F2 is parallel to the width direction of the electrode assembly body 112, and the thickness direction of the tab 111 is parallel to the thickness direction of the electrode assembly body 112. For example, the first direction F1 is parallel to the length direction of the electrode assembly body 112, and the second direction F2 is parallel to the width direction of the electrode assembly body 112.

[0109] In this way, the tab 111 can be well protected by the protection member 120 from at least one side in the second direction F2, the risk of cracking of the tab 111 can be reduced, and the reliability of the battery cell 100 can be improved.

[0110] In some embodiments, referring to Figure 6 and Figure 7 , the tab 111 has a first side S1 and a second side S2 opposite to each other in the thickness direction of the tab 111, the protection member 120 includes a first protection layer 121 and a second protection layer 122, the first protection layer 121 is arranged on the surface of the first side S1 of the tab 111, the second protection layer 122 is arranged on the surface of the second side S2 of the tab 111, and the first protection layer 121 is connected with the second protection layer 122 in the thickness direction of the tab 111. In the protection member 120, at least the first protection layer 121 covers at least part of the peripheral area 1112, and at least the first protection layer 121 is provided with a window K.

[0111] The first side S1 is closer to the welding head 20 than the second side S2 in the thickness direction of the tab 111, and the second side S2 is farther away from the welding head 20 than the first side S1.

[0112] In the welding operation of the tab 111, the first side S1 is the top side of the tab 111, and the second side S2 is the bottom side of the tab 111.

[0113] The “at least the first protection layer 121 covers at least part of the peripheral area 1112” can be that the first protection layer 121 covers at least part of the first side S1 of the peripheral area 1112, or that the first protection layer 121 covers at least part of the first side S1 of the peripheral area 1112 and the second protection layer 122 covers at least part of the second side S2 of the peripheral area 1112.

[0114] The “at least the first protection layer 121 is provided with a window K” can be that the first protection layer 121 is provided with a window K, or that the first protection layer 121 and the second protection layer 122 are provided with windows K.

[0115] In this way, at least part of the peripheral area 1112 can be protected by the protection member 120, and the welding head 20 can weld the tab 111 with the to-be-welded member through the window K on the first side S1.

[0116] In some embodiments, the first protection layer 121 and the second protection layer 122 are connected in the thickness direction of the tab 111 on the same side in the second direction F2. The first protection layer 121 and the second protection layer 122 are respectively provided with windows K.

[0117] It can be understood that the first protective layer 121 and the second protective layer 122 are connected along the thickness direction of the tab 111 on one side of the second direction F2, and the first protective layer 121 and the second protective layer 122 are connected along the thickness direction of the tab 111 on the other side of the second direction F2.

[0118] In one aspect, at least part of the peripheral area 1112 can be protected by the protective member 120, and the welding head 20 can weld the tab 111 with the to-be-welded member through the window K located on the first side S1; on the other hand, the second protective layer 122 is arranged on the second side S2 of the tab 111 and the welding seat for supporting the tab 111, and the second protective layer 122 is provided with a window K, which reduces the contact between the first welding area 1111 of the tab 111 and the second protective layer 122, and further reduces the sticking of the second protective layer 122 due to high-temperature melting, thereby improving the welding reliability of the battery monomer 100. In addition, the first protective layer 121 and the second protective layer 122 are connected along the thickness direction of the tab 111 on the same side of the second direction F2, which can further improve the stability of the protective member 120 arranged on the tab 111, and further improve the protection reliability of the tab 111. In some embodiments, the electrode assembly body 112 has a third side on the same side of the first side S1 along the thickness direction of the tab 111, and a fourth side arranged opposite to the third side.

[0119] Part of the first protective layer 121 is arranged on the first side S1 of the tab 111, and the other part of the first protective layer 121 extends to the third side of the electrode assembly body 112. Part of the second protective layer 122 is arranged on the second side S2 of the tab 111, and the other part of the second protective layer 122 extends to the fourth side of the electrode assembly body 112.

[0120] The third side refers to one side of the electrode assembly body 112 on the same side of the first side S1 along the thickness direction of the tab 111, and the fourth side refers to one side of the electrode assembly body 112 arranged opposite to the third side.

[0121] In this way, the first protective layer 121 and the second protective layer 122 can be used to protect the opposite sides of the tab 111 along the thickness direction of the tab 111 at the root of the tab 111, which can better reduce the risk of cracking of the tab 111, and further improve the reliability of the battery monomer 100.

[0122] In some embodiments, along the thickness direction of the tab 111, the tab 111 has a first side S1, the protective member 120 is arranged at least on the surface of the first side S1 of the tab 111, and the window K is arranged at least on the part of the protective member 120 arranged on the first side S1.

[0123] Along the thickness direction of the tab 111, the first side S1 is closer to the welding head 20 than the second side S2.

[0124] It can be understood that the part of the protection piece 120 arranged on the first side S1 covers at least part of the peripheral area 1112, so that the at least part of the peripheral area 1112 can be spaced apart from the welding head 20 used for welding the tab 111 by the protection piece 120, and thus the tab 111 can be better protected, the risk of cracking of the tab 111 can be better reduced, and thus the reliability of the battery monomer 100 can be improved.

[0125] In some embodiments, the electrode assembly 110 further comprises an electrode assembly body 112, the electrode assembly body 112 is provided with a tab 111 on at least one side along a first direction, and the electrode assembly body 112 has a third side on the same side as the first side S1 along the thickness direction of the tab 111, a part of the protection piece 120 is arranged on the first side S1 of the tab 111, and another part of the protection piece 120 extends to the third side of the electrode assembly body 112.

[0126] In this way, a part of the protection piece 120 is arranged on the first side S1 of the tab 111 and covers at least part of the peripheral area 1112, and is provided with a window K so that the first welding area 1111 is welded with the to-be-welded piece, and another part of the protection piece 120 extends to the third side of the electrode assembly body 112, so that the other part of the protection piece 120 can cover the first side S1 of the root of the tab 111, and the root of the tab 111 can also be protected by the protection piece 120, the risk of cracking of the tab 111 can be better reduced, and thus the reliability of the battery monomer 100 can be improved.

[0127] In some embodiments, please refer to Figure 8 and Figure 9 The protection piece 120 comprises a first part 1201 arranged on the first side S1 of the tab 111, a second part 1202 arranged on the third side of the electrode assembly body 112, a third part 1203 connected to the first part 1201 and the second part 1202, and a fourth part 1204, the window K is arranged on the first part 1201, the first part 1201 is provided with the fourth part 1204 on at least one side along a second direction F2, and the fourth part 1204 protrudes from the tab 111 along the second direction F2. The first direction F1 and the second direction F2 are perpendicular to each other and perpendicular to the thickness direction of the tab 111.

[0128] It can be that the first part 1201 is provided with the fourth part 1204 on one side along the second direction F2, or the first part 1201 is provided with the fourth part 1204 on opposite sides along the second direction F2 respectively.

[0129] In this way, the fourth portion 1204 can better protect the side of the tab 111 along the second direction F2, and the third portion 1203 can cover the root of the tab 111 connected to the electrode assembly body 112, thereby better reducing the risk of cracking of the tab 111, and thereby improving the reliability of the battery monomer 100.

[0130] In some embodiments, the tab 111 further has a second side S2 opposite the first side S1 along the thickness direction of the tab 111, and the protection member 120 includes a first portion 1201, a second portion 1202, a third portion 1203, and a fourth portion 1204 arranged on the first side S1 and the second side S2, respectively. It can also be understood that the first protection layer 121 and the second protection layer 122 each include the first portion 1201, the second portion 1202, the third portion 1203, and the fourth portion 1204.

[0131] In this way, the protection member 120 can better protect the first side S1 and the second side S2 of the tab 111, and the fourth portions 1204 of the first protection layer 121 and the second protection layer 122 are bonded to each other, thereby improving the stability of the protection member 120 fixed to the tab 111, and thereby improving the protection reliability of the protection member 120.

[0132] In some embodiments, the battery monomer 100 further includes a to-be-welded member (not shown in the figure), and the tab 111 is welded to the to-be-welded member by means of the window K.

[0133] In this embodiment, the to-be-welded member is a relay member.

[0134] Before welding the tab 111, the peripheral region 1112 of the tab 111 can be protected by the protection member 120, and the first welding region 1111 of the tab 111 can be exposed by the window K on the protection member 120, so as to facilitate subsequent welding of the tab 111, thereby reducing the risk of cracking of the tab 111, and thereby improving the reliability of the battery monomer 100.

[0135] An embodiment of the present application also provides a manufacturing method of a battery monomer, including the following steps:

[0136] S100, providing an electrode assembly and a protection member.

[0137] The electrode assembly 110 includes a tab 111, and the tab 111 has a first welding region 1111 and a peripheral region 1112 arranged around the first welding region 1111.

[0138] S200, arranging the protection member on the tab and covering at least part of the peripheral region.

[0139] The protection member 120 is provided with a window K for exposing the first welding region 1111.

[0140] Thus, before the tab 111 is welded, the peripheral area 1112 of the tab 111 can be protected by the protection piece 120, and the first welding area 1111 of the tab 111 can be exposed by the window K on the protection piece 120, so as to facilitate subsequent welding of the tab 111 and reduce the risk of cracking of the tab 111 caused by welding of the tab 111. In addition, the risk of cracking of the tab 111 during subsequent transportation of the intermediate piece of the battery cell 100 can be reduced, and thus the reliability of the battery cell 100 can be improved.

[0141] In some embodiments, the method for manufacturing the battery cell further includes:

[0142] S300, passing the welding teeth of the welding head through the window to weld the tab and the to-be-welded piece.

[0143] Before the tab and the to-be-welded piece are welded by the welding head, the peripheral area 1112 of the tab 111 can be protected by the protection piece 120, and the risk of cracking of the tab 111 caused by welding of the tab 111 can be reduced. In addition, the risk of cracking of the tab 111 during subsequent transportation of the intermediate piece of the battery cell 100 can be reduced, and thus the reliability of the battery cell 100 can be improved.

[0144] In some embodiments, after the step S200 of placing the protection piece on the tab and covering at least part of the peripheral area, and before the step S300 of passing the welding teeth of the welding head through the window to weld the tab and the to-be-welded piece, the method for manufacturing the battery cell further includes:

[0145] S210, determining whether the protection piece meets a first condition, and if not, adjusting the position of the electrode assembly and / or the protection piece until the protection piece meets the first condition.

[0146] The welding head 20 has a second welding area 21 corresponding to the first welding area 1111, and the first condition includes that the second welding area 21 of the welding head 20 is located within the range of the normal projection of the window K in a reference plane, and the reference plane is perpendicular to the thickness direction of the tab 111.

[0147] The welding head 20 includes a plurality of welding teeth, and the second welding area 21 refers to an area on the welding head 20 where all the welding teeth are located and which corresponds to the first welding area 1111.

[0148] Thus, all the welding teeth of the welding head 20 can pass through the window K, so as to weld the tab 111 and the to-be-welded piece together while reducing the probability of contact between the welding teeth and the protection piece 120, and improving the welding yield of the tab 111.

[0149] In some embodiments, the step S210 of judging whether the protector 120 meets the first condition specifically comprises:

[0150] S211, obtaining a first image of the tab provided with the protector;

[0151] S212, obtaining first position information of the protector according to the first image.

[0152] The first position information of the protector 120 can include coordinate information of the protector 120 along the first direction F1 and coordinate information of the protector 120 along the second direction.

[0153] S213, obtaining second position information of the welding head.

[0154] The second position information of the welding head 20 can include coordinate information of the welding head 20 along the first direction F1 and coordinate information of the welding head 20 along the second direction.

[0155] S214, judging whether the protector meets the first condition according to the first position information of the protector and the second position information of the welding head.

[0156] According to the first position information of the protector 120, the position information of the window K can be obtained, and then by comparing the position information of the window K with the second position information of the welding head 20, whether the protector 120 meets the first condition can be judged.

[0157] In combination with Figure 10 It can be understood that the first position information of the protector 120 can be obtained by using the first image obtaining mechanism 300, and the second position information of the welding head 20 can be obtained by using the second image obtaining mechanism, and the first image obtaining mechanism 300 and the second image obtaining mechanism can be CCD cameras.

[0158] In some embodiments, the welding head 20 further has a holding area 22 arranged around the second welding area 21, and the welding head 20 includes a plurality of welding teeth arranged in the second welding area 21. The holding area 22 is used to hold the side of the protector 120 facing the welding head 20 along the thickness direction of the tab 111. The window K has two first edges K1 oppositely arranged along the first direction F1 and two second edges K2 oppositely arranged along the second direction F2, and the inner side of the holding area 22 has two third edges 221 oppositely arranged along the first direction F1 and two fourth edges 222 oppositely arranged along the second direction F2, along the first direction F1, the first edge K1 is located outside the third edge 221, and along the second direction F2, the second edge K2 is located outside the fourth edge 222.

[0159] The first condition further comprises: along the first direction F1, the first edge K1 and the third edge 221 on the same side have a first preset interval; along the second direction F2, the second edge K2 and the fourth edge 222 on the same side have a second preset interval. The first direction F1 and the second direction F2 are perpendicular to each other and are both perpendicular to the thickness direction of the tab 111.

[0160] The first preset interval is J1 and the second preset interval is J2.

[0161] The pressing area 22 refers to an area arranged on the welding head 20 around the second welding area 21. In general, the pressing area 22 is used to press the side of the protective piece 120 facing the welding head 20.

[0162] In this way, the inner side of the pressing area 22 is within the range of the window K, which facilitates all the welding teeth of the welding head 20 to pass through the window K, reduces the contact between the welding teeth of the welding head 20 and the protective piece 120, and thus can reduce the sticking of the protective piece 120 due to high temperature melting during welding, improve the welding reliability of the tab 111, and also protect the tab 111 well.

[0163] In addition, since the first condition further comprises: along the first direction F1, the first edge K1 and the third edge 221 on the same side have a first preset interval, and along the second direction F2, the second edge K2 and the fourth edge 222 on the same side have a second preset interval, all the welding teeth of the welding head 20 can pass through the window K while giving the welding teeth of the welding head 20 a certain activity space, reducing the probability of the welding teeth of the welding head 20 contacting the protective piece 120 in welding vibration, and thus the welding reliability of the tab 111 can be better improved.

[0164] In some embodiments, the size of the pressing area 22 along the first direction F1 is W, the size of the pressing area 22 along the second direction F2 is L, the first preset interval is 0.2×W to 0.5×W, and the second preset interval is 0.2×L to 0.5×L.

[0165] For example, the first preset interval is 0.2×W, 0.3×W, 0.4×W or 0.5×W, and the second preset interval is 0.2×L, 0.3×L, 0.4×L or 0.5×L.

[0166] The peripheral area 1112 covered by the protector 120 corresponds to the holding area 22 of the welding head 20, and thus the first preset distance and the second preset distance need to be proportional to the size of the holding area 22 of the welding head 20. The larger the size of the holding area 22, the larger the area covered by the protector 120. In addition, the protector 120 should be as close as possible to the inner side edge of the holding area 22 to facilitate better protection of the tab 111, and at the same time, the protector 120 should not contact the welding head 20 as much as possible to affect the welding effect. Therefore, the first preset distance and the second preset distance are set in an appropriate range, for example, the first preset distance is set to 0.2xW to 0.5xW, and the second preset distance is set to 0.2xL to 0.5xL. In this way, all the welding teeth of the welding head 20 can pass through the window K while giving the welding teeth of the welding head 20 a certain space for movement, reducing the probability of the welding teeth of the welding head 20 contacting the protector 120 in welding vibration, and thus better improving the welding reliability of the tab 111.

[0167] The welding head 20 can be configured to reciprocate within a preset angle about an axis parallel to the second direction F2. The first preset distance can be 0.3xW to 0.5xW. The second preset distance can be 0.2xL to 0.4xL.

[0168] For example, the first preset distance can be 0.3xW, 0.4xW, or 0.5xW. The second preset distance can be 0.2xL, 0.3xL, or 0.4xL.

[0169] The preset angle can be greater than 0 degrees and less than 10 degrees, or even smaller, such as greater than 0 degrees and less than or equal to 5 degrees. For example, the preset angle can be 1 degree, 2 degrees, 3 degrees, 4 degrees, or 5 degrees.

[0170] During the welding operation using the welding head 20, a certain welding power is applied to the welding head 20, causing the welding head 20 to produce mechanical vibration. If the welding head 20 is a longitudinal welding head, it will reciprocate within a preset angle about an axis parallel to the second direction F2, requiring a larger space for movement of the welding head 20 in the first direction F1. Therefore, the first preset distance is set to 0.3xW to 0.5xW, and the second preset distance is set to 0.2xL to 0.4xL, which is more conducive to the space requirement of the welding head 20 during the welding operation, reduces the probability of the welding teeth of the welding head 20 contacting the protector 120 in welding vibration, and also allows all the welding teeth of the welding head 20 to pass through the window K.

[0171] The welding head 20 can be configured to reciprocate within a preset angle about an axis parallel to the first direction F1. The first preset distance can be 0.2xW to 0.4xW. The second preset distance can be 0.3xL to 0.5xL.

[0172] For example, the first preset interval is 0.2*W, 0.3*W or 0.4*W, and the second preset interval is 0.3*L, 0.4*L or 0.5*L.

[0173] During the welding operation of the welding head 20, a certain welding power is applied to the welding head 20, so that the welding head 20 will generate mechanical vibration. If the welding head 20 is a transverse welding head, it will reciprocate within a preset angle around an axis parallel to the first direction F1, so that the welding head 20 needs a larger space for movement in the second direction F2. Therefore, the first preset interval is set to 0.2*W to 0.4*W, and the second preset interval is set to 0.3*L to 0.5*L, which is more conducive to the space requirement of the welding head 20 during the welding operation, reduces the probability of the welding teeth of the welding head 20 contacting the protective piece 120 during welding vibration, and also allows all the welding teeth of the welding head 20 to pass through the window K.

[0174] In some embodiments, the first preset interval is 0.1mm-0.5mm, and the second preset interval is 0.1mm-0.5mm.

[0175] For example, the first preset interval is 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, and the second preset interval is 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0176] In this way, the first preset interval and the second preset interval are set within a suitable range, such as within the range of 0.1mm-0.5mm. In this way, the deviation between the window K on the protective piece 120 and the welding position of the welding head 20 can be reduced. The smaller the first preset interval and the second preset interval, the smaller the deviation, which is conducive to the passage of all the welding teeth of the welding head 20 through the window K, while also providing a certain movement space for the welding teeth of the welding head 20, reducing the probability of the welding teeth of the welding head 20 contacting the protective piece 120 during welding vibration, and also reducing the probability of the protective piece 120 sticking, thereby better improving the welding reliability of the tab 111.

[0177] In some embodiments, before the step S200 of arranging the protective piece on the tab and covering at least part of the peripheral area, the method for manufacturing the battery cell further comprises:

[0178] S110, acquiring a second image of the tab.

[0179] In combination Figure 11 It can be understood that the second image of the tab 111 can be acquired by the third image acquisition mechanism 400, which can be a CCD camera.

[0180] S120, judging whether the relative position relationship between the protection piece and the tab meets a second condition according to the second image, if not, adjusting the position of the protection piece and / or the tab until the relative position relationship between the protection piece and the tab meets the second condition.

[0181] The second condition comprises that the orthographic projection of the first welding area 1111 in the reference plane is located within the range of the orthographic projection of the window K in the reference plane.

[0182] The position of the electrode assembly 110 can be adjusted through a clamp or a mechanical hand, that is, the position of the tab 111 can be adjusted. Of course, the present application is not limited thereto, and the position of the tab 111 can also be adjusted through other ways.

[0183] The position of the protection piece 120 can be adjusted through manual operation or a mechanical hand, and the protection piece 120 can be adsorbed or released by a gluing mechanism. The mechanical hand is connected to the gluing mechanism to drive the gluing mechanism to move, thereby adjusting the position of the protection piece 120.

[0184] The second image of the tab 111 can be obtained, and the two-dimensional coordinate information of the first welding area 1111 can be obtained according to the second image of the tab 111. The two-dimensional coordinate information of the first welding area 1111 can comprise coordinate information of the first welding area 1111 along the first direction F1 and coordinate information of the first welding area 1111 along the second direction F2. The two-dimensional coordinate information of the protection piece 120 (for example, the two-dimensional coordinate information of the protection piece 120 is obtained through a fourth image acquisition mechanism, and the fourth image acquisition mechanism can be a CCD camera) can also be obtained. Similarly, the two-dimensional coordinate information of the protection piece 120 can comprise coordinate information of the edge of the window K along the first direction F1 and coordinate information of the edge of the window K along the second direction F2. By comparing the two-dimensional coordinate information of the protection piece 120 and the two-dimensional coordinate information of the first welding area 1111, whether the orthographic projection of the first welding area 1111 in the reference plane is located within the range of the orthographic projection of the window K in the reference plane can be determined, thereby judging whether the protection piece 120 is correctly positioned on the tab 111, and improving the accuracy of the protection piece 120 positioned on the tab 111.

[0185] In the present application, on one aspect, the position of the tab 111 is detected before the protector 120 is arranged on the tab 111, and then the position of the protector 120 is adjusted by feedback, that is, the relative position of the protector 120 and the tab 111 is determined first, so as to facilitate the orthographic projection of the first welding area 1111 in the reference plane to be located in the range of the orthographic projection of the window K in the reference plane, thereby improving the position accuracy of the protector 120 arranged on the tab 111; after the protector 120 is arranged on the tab 111, the position of the tab 111 and the protector 120 is detected again, that is, the relative position of the protector 120 and the welding head 20 is determined again, which is conducive to the orthographic projection of the second welding area 21 of the welding head 20 in the reference plane to be located in the range of the orthographic projection of the window K in the reference plane, so that, through double detection (or through two detections and feedbacks of the CCD), the position fluctuation of the protector 120 can be controlled within the positioning accuracy of the equipment, the position accuracy of the protector 120 arranged on the tab 111 can be improved, and the protector 120 can be better used to reduce the cracking of the tab 111.

[0186] In some embodiments, a part of the protector 120 is arranged on the first side S1 of the tab 111, and another part of the protector 120 extends to the third side of the electrode assembly body 112.

[0187] Before ultrasonic welding, the tab 111 is protected by the protector 120, and the gluing position not only covers the peripheral area 1112 but also covers the root of the tab 111, so that the root of the tab 111 is also protected, the probability of damage to the tab 111 in the welding process or subsequent transportation process is reduced, and effective welding of the tab 111 can also be achieved.

[0188] In the technical solution of the present application, before the tab 111 is welded, the tab 111 is glued by the protector 120, so that the tab 111 can be effectively protected during welding, and the contact between the pressing area 22 of the welding head 20 and the peripheral area 1112 of the tab 111 can be reduced during the welding process of the tab 111, thereby reducing the probability of cracking of the peripheral area 1112 of the tab 111 due to friction.

[0189] The technical solution of the present application not only effectively prevents the tab 111 from cracking, but also does not affect the welding operation or other operations, and even because the surface of the tab 111 is protected by the protector 120, the welding effect of the tab 111 can be significantly improved. In the past, in order to ensure that the tab 111 does not crack during welding, the welding parameters are as small as possible, and in the present application, due to the arrangement of the protector 120, the welding parameters can be improved, thereby improving the sufficient fusion between the tab 111 and the to-be-welded piece, and thus the tab 111 can be more effectively welded.

[0190] The technical scheme of the application has the effects of convenience, rapidity, reliability and easy operation, and can greatly improve the quality of the battery monomer 100 and the battery device 10.

[0191] An embodiment of the application further provides a manufacturing method of a battery monomer, comprising the following steps.

[0192] S1000, providing a tab, a protective piece and an electrode assembly body.

[0193] The tab 111 has a first welding area 1111 and a peripheral area 1112 arranged around the first welding area 1111.

[0194] S2000, arranging the protective piece on the tab and covering at least part of the peripheral area.

[0195] The protective piece 120 is provided with a window K exposing the first welding area 1111.

[0196] S3000, welding the tab provided with the protective piece and the electrode assembly body through the window to form an electrode assembly.

[0197] In this way, before the tab 111 is welded to the electrode assembly body 112, at least part of the peripheral area 1112 of the tab 111 is protected by the protective piece 120, so that the risk of cracking of the tab 111 can be reduced.

[0198] In the embodiment, at least part of the peripheral area 1112 of the tab 111 can still be protected by the protective piece 120 before the tab 111 is welded to the adapter, so that the risk of cracking of the tab 111 can be reduced.

[0199] An embodiment of the application further provides a battery device 10, comprising the battery monomer 100 of any embodiment or the battery monomer 100 prepared by the manufacturing method of the battery monomer 100 of any embodiment.

[0200] An embodiment of the application further provides a power consumption device comprising the battery device 10.

[0201] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the description.

[0202] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery cell, characterized in that, include: An electrode assembly (110) includes a tab (111) having a first welding area (1111) and a peripheral area (1112) surrounding the first welding area (1111); and A protective element (120) is disposed on the electrode tab (111) and covers at least a portion of the peripheral area (1112); the protective element (120) is provided with a window (K) for exposing the first welding area (1111). The electrode assembly (110) further includes an electrode assembly body (112), which includes positive and negative electrode portions having active materials. The electrode assembly body (112) has the tab (111) on at least one side along a first direction; the protective member (120) also extends to cover at least one side of the tab (111) along a second direction; Wherein, the first direction and the second direction are perpendicular to each other and both are perpendicular to the thickness direction of the tab (111); Along the thickness direction of the electrode tab (111), the electrode tab (111) has a first side (S1) and a second side (S2) disposed opposite to each other; the protective member (120) includes: A first protective layer (121) is disposed on the surface of the first side (S1) of the tab (111); and A second protective layer (122) is provided on the surface of the second side (S2) of the tab (111); Along the thickness direction of the tab (111), the first protective layer (121) and the second protective layer (122) are connected on the same side along the second direction along the thickness direction of the tab (111); In the protective element (120), at least the first protective layer (121) covers at least a portion of the peripheral area (1112), and the first protective layer (121) and the second protective layer (122) are respectively provided with the window (K). The electrode assembly body (112) has a third side located on the same side as the first side (S1) along the thickness direction of the tab (111); a portion of the first protective layer (121) is disposed on the first side (S1) of the tab (111), and another portion of the first protective layer (121) extends to the outer surface of the electrode assembly body (112) which is entirely located on the third side.

2. The battery cell according to claim 1, characterized in that, The orthographic projection of the first welding area (1111) onto the reference plane is located within the range of the orthographic projection of the window (K) onto the reference plane; The reference plane is perpendicular to the thickness direction of the tab (111).

3. The battery cell according to claim 1, characterized in that, The material of the protective element (120) includes insulating material.

4. The battery cell according to claim 1, characterized in that, The protective element (120) is bonded to the tab (111).

5. The battery cell according to claim 1, characterized in that, The outer perimeter (1112) is arranged around the first welding area (1111).

6. The battery cell according to any one of claims 1-5, characterized in that, The thickness of the tab (111) is D, and the thickness of the protective element (120) is 0.1×D to 0.2×D.

7. The battery cell according to claim 1, characterized in that, The electrode assembly body (112) has a fourth side disposed opposite to the third side along the thickness direction of the tab (111); A portion of the second protective layer (122) is disposed on the second side (S2) of the tab (111), and another portion of the second protective layer (122) extends to the fourth side of the electrode assembly body (112).

8. The battery cell according to any one of claims 1-5, characterized in that, The tab (111) has a first side (S1) along the thickness direction of the tab (111). The protective member (120) is at least disposed on the surface of the first side (S1) of the tab (111), and the window (K) is at least disposed on the portion of the protective member (120) disposed on the first side (S1).

9. The battery cell according to claim 8, characterized in that, The electrode assembly (110) further includes an electrode assembly body (112), and the electrode assembly body (112) has the tab (111) on at least one side along the first direction. Along the thickness direction of the tab (111), the electrode assembly body (112) has a third side located on the same side as the first side (S1); A portion of the protective member (120) is disposed on the first side (S1) of the tab (111) and covers at least a portion of the peripheral area (1112), and another portion of the protective member (120) extends to the third side of the electrode assembly body (112).

10. The battery cell according to claim 9, characterized in that, The protective element (120) includes a first part (1201) disposed on a first side (S1) of the electrode tab (111), a second part (1202) disposed on a third side of the electrode assembly body (112), a third part (1203) connected to the first part (1201) and the second part (1202), and a fourth part (1204). The window (K) is located on the first part (1201); The first portion (1201) has the fourth portion (1204) on at least one side along the second direction, and the fourth portion (1204) protrudes from the tab (111) along the second direction. Wherein, the first direction and the second direction are perpendicular to each other and both are perpendicular to the thickness direction of the tab (111).

11. The battery cell according to any one of claims 1-5, characterized in that, The battery cell also includes components to be welded; The tab (111) is welded to the workpiece by means of the window (K).

12. A method for manufacturing a battery cell, used to prepare the battery cell according to any one of claims 1-11, characterized in that, include: An electrode assembly (110) and a protective element (120) are provided; wherein the electrode assembly (110) includes a tab (111) having a first welding area (1111) and a peripheral area (1112) disposed around the first welding area (1111). The protective element (120) is disposed on the electrode tab (111) and covers at least a portion of the peripheral area (1112); the protective element (120) is provided with a window (K) for exposing the first welding area (1111).

13. The method for manufacturing a single battery cell according to claim 12, characterized in that, The method for manufacturing the battery cell further includes: The welding teeth of the welding head (20) are passed through the window (K) to weld the electrode (111) and the workpiece to be welded.

14. The method for manufacturing a single battery cell according to claim 13, characterized in that, After the protective member (120) is disposed on the electrode tab (111) and covers at least a portion of the peripheral area (1112), before the welding teeth of the welding head (20) are passed through the window (K) to weld the electrode tab (111) and the workpiece to be welded, the method further includes: Determine whether the protective element (120) meets the first condition. If not, adjust the position of the electrode assembly (110) and / or the protective element (120) until the protective element (120) meets the first condition. The welding head (20) has a second welding area (21) corresponding to the first welding area (1111), and the first condition includes: the orthographic projection of the second welding area (21) of the welding head (20) in the reference plane is located within the range of the orthographic projection of the window (K) in the reference plane; The reference plane is perpendicular to the thickness direction of the tab (111).

15. The method for manufacturing a single battery cell according to claim 14, characterized in that, The determination of whether the protective element (120) meets the first condition specifically includes: Acquire a first image of the tab (111) on which the protective element (120) is provided; Based on the first image, obtain the first position information of the protective component (120); Obtain the second position information of the welding head (20); Based on the first position information of the protective element (120) and the second position information of the welding head (20), it is determined whether the protective element (120) meets the first condition.

16. The method for manufacturing a single battery cell according to claim 14, characterized in that, The welding head (20) also has a holding area (22) disposed around the second welding area (21); the welding head (20) includes a plurality of welding teeth disposed in the second welding area (21); Along the thickness direction of the tab (111), the holding area (22) is used to hold the protective member (120) on the side facing the welding head (20); The window (K) has two first edges (K1) arranged opposite each other along a first direction, and two second edges (K2) arranged opposite each other along a second direction. The inner side of the pressing area (22) has two third edges (221) arranged opposite to each other in a first direction, and two fourth edges (222) arranged opposite to each other in a second direction. Along the first direction, the first edge (K1) is located outside the third edge (221); Along the second direction, the second edge (K2) is located outside the fourth edge (222); The first condition further includes: along the first direction, there is a first preset distance between the first edge (K1) and the third edge (221) on the same side; along the second direction, there is a second preset distance between the second edge (K2) and the fourth edge (222) on the same side; Wherein, the first direction and the second direction are perpendicular to each other and both are perpendicular to the thickness direction of the tab (111).

17. The method for manufacturing a single battery cell according to claim 16, characterized in that, The dimension of the pressing area (22) along the first direction is W, and the dimension of the pressing area (22) along the second direction is L; The first preset spacing is 0.2×W to 0.5×W, and the second preset spacing is 0.2×L to 0.5×L.

18. The method for manufacturing a single battery cell according to claim 17, characterized in that, The welding head (20) is configured to reciprocate within a preset angle about an axis parallel to the second direction; the first preset distance is 0.3×W to 0.5×W; the second preset distance is 0.2×L to 0.4×L; or The welding head (20) is configured to reciprocate within a preset angle about an axis parallel to the first direction; the first preset distance is 0.2×W to 0.4×W; the second preset distance is 0.3×L to 0.5×L.

19. The method for manufacturing a single battery cell according to claim 16, characterized in that, The first preset spacing is 0.1mm-0.5mm, and the second preset spacing is 0.1mm-0.5mm.

20. The method for manufacturing a single battery cell according to claim 12, characterized in that, Before the protective member (120) is disposed on the tab (111) and covers at least a portion of the peripheral area (1112), the method for manufacturing the battery cell further includes: Acquire a second image of the electrode (111); Based on the second image, determine whether the relative positional relationship between the protective member (120) and the electrode (111) satisfies the second condition. If not, adjust the position of the protective member (120) and / or the electrode (111) until the relative positional relationship between the protective member (120) and the electrode (111) satisfies the second condition. The second condition includes: the orthographic projection of the first welding area (1111) in the reference plane is located within the range of the orthographic projection of the window (K) in the reference plane.

21. A method for manufacturing a battery cell, used to prepare the battery cell according to any one of claims 1-11, characterized in that, include: Provided are tabs (111), protective members (120) and electrode assembly bodies (112); the tabs (111) have a first welding area (1111) and a peripheral area (1112) disposed around the first welding area (1111); The protective element (120) is disposed on the electrode tab (111) and covers at least a portion of the peripheral area (1112); the protective element (120) is provided with a window (K) that exposes the first welding area (1111). Through the window (K), the tab (111) with the protective element (120) is welded to the electrode assembly body (112).

22. A battery device, characterized in that, This includes battery cells as described in any one of claims 1-11 or battery cells prepared by the method of manufacturing battery cells as described in any one of claims 12-21.

23. An electrical appliance, characterized in that, Includes the battery device as described in claim 22.

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