Cover plate assembly, battery, battery pack and electric device

Abstract

The application discloses a cover plate assembly, a battery, a battery pack and an electric equipment, and belongs to the technical field of batteries. The cover plate assembly comprises a cover plate, an insulating piece, a positioning assembly and a conductive sheet, the cover plate is provided with a first through hole, the insulating piece is sealingly arranged in the first through hole, the positioning assembly is installed in the first through hole through the insulating piece, the positioning assembly has an installation position and forms a second through hole in communication with the installation position, so that a tab part of an electrode core of a battery cell extends from the second through hole to the installation position, and the conductive sheet is arranged at the installation position and electrically connected with the tab. The tab is made to pass through the second through hole formed by the positioning assembly and extend to the installation position from one end of the electrode core of the battery cell, and is electrically connected with the conductive sheet, so that the overall structure of the cover plate assembly is optimized, the performance and reliability of the battery are improved, and the production cost is reduced and the production efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a cover plate assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] Currently, battery energy conversion and output are often achieved through tabs and terminals. However, the structural shape and size of the terminals and tabs affect the battery's internal space utilization, production cost, and production efficiency. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a cover plate assembly, a battery, a battery pack, and an electrical device, which optimizes the overall structure of the cover plate assembly, thereby not only improving the performance and reliability of the battery, but also reducing production costs and increasing production efficiency.

[0004] In a first aspect, this application provides a cover plate assembly, comprising:

[0005] The cover plate has a first through hole;

[0006] An insulating component, sealed through the first through hole;

[0007] A positioning component is mounted on the first through hole via the insulating member. The positioning component has a mounting position and forms a second through hole that communicates with the mounting position, so that the tab portion of the battery cell extends from the second through hole to the mounting position.

[0008] A conductive sheet is disposed at the mounting position and electrically connected to the electrode tab.

[0009] According to the cover plate assembly of this application, compared with the related technology which requires the electrode post to pass through the cover plate and the electrode lead-out piece to be provided on the side of the cover plate near the cell for electrical connection with the electrode, the positioning assembly is installed in the first through hole of the cover plate through the insulating part, and the end of the electrode away from the cell passes through the second through hole and extends to the mounting position and is electrically connected to the conductive sheet. This reduces the number of required parts, improves the convenience of assembly, and reduces the production cost. It also makes the overall structure of the cover plate assembly more compact, thereby improving the internal space utilization of the battery and improving the electrochemical performance of the battery.

[0010] According to one embodiment of this application, the outer side wall of the insulating member is provided with a first protrusion and a second protrusion along the circumferential direction. The first protrusion is located outside the first through hole and away from the electrode core of the battery cell, and the second protrusion is located outside the first through hole and close to the electrode core. The sides of the first protrusion and the second protrusion that are close to each other abut against the two sides of the cover plate respectively.

[0011] According to one embodiment of this application, along the length direction of the cover plate, the length of the first boss is greater than the length of the second boss.

[0012] According to one embodiment of this application, the insulating member forms a third through hole, and the positioning assembly includes:

[0013] A first positioning member is inserted through the third through hole to form the second through hole, and a first notch is provided on the side of the first positioning member away from the electrode core of the battery cell. The first notch is connected to the second through hole, and the mounting position includes the first notch.

[0014] According to one embodiment of this application, the outer side wall of the insulating member is provided with a second protrusion along the circumferential direction. The second protrusion is located outside the first through hole and close to the pole core. The outer side wall of the first positioning member is provided with a third protrusion along the circumferential direction. The third protrusion is located outside the third through hole and close to the pole core. The two opposite sides of the second protrusion abut against the cover plate and the third protrusion, respectively.

[0015] According to one embodiment of this application, the positioning component further includes:

[0016] The second positioning member is sleeved outside the first positioning member and abuts against the insulating member. The second positioning member is provided with a first recess for accommodating the conductive sheet. The bottom wall of the first recess is provided with a second notch, and the second notch and the first notch are connected. The mounting position also includes the first recess.

[0017] According to one embodiment of this application, the groove surface of the second positioning member near the first sink and the side of the conductive sheet away from the electrode core are connected by laser welding; or

[0018] The side of the first positioning member away from the electrode core, the inner wall of the first sink, and the side of the conductive sheet near the electrode core are connected by brazing.

[0019] According to one embodiment of this application, the second notch and the first notch are joined to form a continuous first plane, so that the end of the electrode tab away from the electrode core is in contact with the first plane.

[0020] According to one embodiment of this application, the bottom wall of the first sink and the side of the first positioning member away from the pole core are spliced ​​together to form a continuous second plane, so that the side of the conductive sheet away from the pole core is connected to the second plane.

[0021] According to one embodiment of this application, the second positioning member has a fourth through hole and forms a second recessed groove. The opening of the second recessed groove and the opening of the first recessed groove are arranged opposite to each other. The fourth through hole is connected to the first recessed groove and the second recessed groove respectively. The outer side wall of the first positioning member is provided with a fourth protrusion along the circumferential direction. The fourth protrusion passes through the insulating member and abuts against the second recessed groove. The outer side wall portion of the first positioning member located away from the pole core of the fourth protrusion abuts against the inner edge of the fourth through hole.

[0022] According to one embodiment of this application, the outer side wall of the insulating member is provided with a first protrusion along the circumferential direction. The first protrusion is located outside the first through hole and away from the electrode core of the battery cell. The cover plate forms a groove. The first through hole is located on the bottom wall of the groove. The outer side wall of the second positioning member near the electrode core and the outer side wall of the first protrusion are both abutted and engaged with the inner side wall of the groove. The sides of the second positioning member and the bottom wall of the groove that are close to each other are respectively abutted and engaged with the two sides of the first protrusion.

[0023] According to one embodiment of this application, it also includes:

[0024] A spacer ring is disposed on the side of the cover plate near the electrode core of the battery cell and is sleeved on the outside of the insulating component.

[0025] According to one embodiment of this application, the spacer forms a fifth through hole, and the outer side wall of the insulating member is provided with a second protrusion along the circumferential direction. The second protrusion is located outside the first through hole and close to the electrode core of the battery cell, and the second protrusion is disposed inside the fifth through hole.

[0026] According to one embodiment of this application, the conductive sheet and the positioning component are welded together.

[0027] According to one embodiment of this application, the welding method includes one of laser welding and brazing.

[0028] According to one embodiment of this application, the length and width of the first through hole are e and f, the length and width of the cover plate are c and d, and the area of ​​the electrode tab at the mounting position is S, satisfying the following formula:

[0029] f≤2 / 3d, and S<2ef≤1 / 2cd.

[0030] Secondly, this application provides a battery comprising:

[0031] Battery cell;

[0032] Housing, the battery cell disposed within the housing; and

[0033] The cover plate assembly described above is connected to both the battery cell and the housing.

[0034] According to the battery of this application, by having one end of the tab in the cover assembly away from the core of the cell pass through the second through hole formed by the positioning assembly and extend to the mounting position, and electrically connect with the conductive sheet, the overall structure of the cover assembly is optimized, which not only improves the performance and reliability of the battery, but also reduces production costs and improves production efficiency.

[0035] Thirdly, this application provides a battery pack comprising a plurality of batteries as described above.

[0036] The battery pack provided in the embodiments of this application achieves optimization in multiple aspects such as space utilization, overcurrent capacity, structural stability, safety, production efficiency and maintenance convenience by using the above-mentioned battery, thereby improving the reliability and cost-effectiveness of the battery pack.

[0037] Fourthly, this application provides an electrical device including the aforementioned battery pack.

[0038] The electrical equipment according to this application improves the safety and reliability of its use by using the aforementioned battery pack.

[0039] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0040] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0041] Figure 1 This is one of the structural schematic diagrams of the cover plate assembly and the battery cell when they are assembled according to the embodiments of this application;

[0042] Figure 2 This is the second schematic diagram of the structure of the cover plate assembly and the battery cell with the conductive sheet hidden when they are combined, according to the embodiments of this application;

[0043] Figure 3 This is one of the cross-sectional views of the cover plate assembly with the conductive sheet hidden, provided in the embodiments of this application;

[0044] Figure 4 This is a second cross-sectional view of the cover plate assembly with the conductive sheet hidden, provided in the embodiments of this application;

[0045] Figure 5 This is a schematic diagram of the structure of the insulating component and the positioning component provided in the embodiments of this application.

[0046] Figure 6This is a schematic diagram of the structure of the cover plate provided in the embodiment of this application;

[0047] Figure 7 This is a schematic diagram of the spacer structure provided in an embodiment of this application;

[0048] Figure 8 This is a schematic diagram of the structure of the insulating component provided in the embodiments of this application;

[0049] Figure 9 This is a schematic diagram of the structure of the first positioning element provided in the embodiments of this application;

[0050] Figure 10 This is one of the structural schematic diagrams of the second positioning member provided in the embodiments of this application;

[0051] Figure 11 This is the second structural schematic diagram of the second positioning member provided in the embodiments of this application.

[0052] Figure label:

[0053] 110. Cover plate; 111. First through hole; 112. Groove;

[0054] 120. Insulating component; 121. First boss; 122. Second boss; 123. Third through hole;

[0055] 130. Positioning component; 1301. Mounting position; 13011. First notch; 13012. First recess; 130121. Second notch;

[0056] 131. First positioning element; 1310. Second through hole; 1311. Third boss; 1312. Fourth boss;

[0057] 132. Second positioning element; 1321. Fourth through hole; 1322. Second countersunk groove;

[0058] 140. Conductive sheet;

[0059] 150. Spacer ring; 151. Fifth through hole;

[0060] 910, Core; 920, Tab; 921, Folded Edge. Detailed Implementation

[0061] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0062] The following is for reference. Figures 1-11The cover plate assembly provided in the embodiments of this application is described. The cover plate assembly includes a cover plate 110, an insulating member 120, a positioning member 130, and a conductive sheet 140.

[0063] The cover plate 110 has a first through hole 111. It should be noted that the size and number of the first through holes 111 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the first through hole 111 is an oval hole.

[0064] The insulating element 120 is sealed through the first through hole 111 to provide electrical isolation between the battery cell and the cover plate 110, reduce the possibility of short circuits, and ensure the safe operation of the battery cell. For example, the material of the insulating element 120 includes, but is not limited to, rubber.

[0065] The positioning component 130 is mounted on the first through hole 111 via the insulating member 120. The positioning component 130 has a mounting position 1301 and forms a second through hole 1310 communicating with the mounting position 1301, so that the electrode 920 portion of the battery cell extends from the second through hole 1310 to the mounting position 1301. The conductive sheet 140 is disposed at the mounting position 1301 and is electrically connected to the electrode 920. It should be noted that the size and number of the second through holes 1310 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the second through hole 1310 is an oval hole.

[0066] Understandably, compared to related technologies that require electrode posts to be inserted into the cover plate and tabs to be provided on the side of the cover plate near the cell for electrical connection, the positioning assembly 130 is installed in the first through hole 111 of the cover plate 110 through the insulating part 120. The end of the tab 920 away from the cell, the electrode core 910, passes through the second through hole 1310 and extends to the mounting position 1301 and is electrically connected to the conductive piece 140. This reduces the number of required parts, improves the convenience of assembly, and lowers production costs. It also makes the overall structure of the cover plate assembly more compact, thereby improving the utilization of the internal space of the battery and improving the electrochemical performance of the battery.

[0067] According to the cover plate assembly provided in the embodiments of this application, by having one end of the electrode core 910 away from the battery cell pass through the second through hole 1310 formed by the positioning assembly 130 and extend to the mounting position 1301, and electrically connect with the conductive sheet 140, the overall structure of the cover plate assembly is optimized, which not only improves the performance and reliability of the battery, but also reduces production costs and improves production efficiency.

[0068] In some embodiments, such as Figures 3 to 5 and Figure 8As shown, the outer side wall of the insulating member 120 is provided with a first protrusion 121 and a second protrusion 122 along the circumferential direction. The first protrusion 121 is located outside the first through hole 111 and away from the electrode core 910 of the battery cell. The second protrusion 122 is located outside the first through hole 111 and close to the electrode core 910. The sides of the first protrusion 121 and the second protrusion 122 that are close to each other abut against the two sides of the cover plate 110, respectively. It should be noted that the shape and size of the first protrusion 121 and the second protrusion 122 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the cross-section of the first protrusion 121 is square ring-shaped, and the cross-section of the second protrusion 122 is elliptical ring-shaped.

[0069] Understandably, the first protrusion 121 and the second protrusion 122 are located at the top and bottom of the insulating member 120, respectively, increasing the contact area between the insulating member 120 and the cover plate 110 and providing better insulation to the cover plate 110, thereby improving battery safety. Simultaneously, considering the relatively thin thickness of the cover plate 110, the first protrusion 121 and the second protrusion 122 can also increase the sealing path length between the insulating member 120 and the cover plate 110, improving the sealing effect.

[0070] In some embodiments, such as Figures 3 to 5 and Figure 8 As shown, along the length of the cover plate 110, the length of the first boss 121 is greater than the length of the second boss 122.

[0071] It is understandable that, considering that the second protrusion 122 is closer to the battery cell than the first protrusion 121, the length of the first protrusion 121 is made greater than the length of the second protrusion 122. That is, along the length direction of the battery cell, the projection of the second protrusion 122 is located within the projection of the first protrusion 121, and the projected area of ​​the second protrusion 122 is smaller than the projected area of ​​the first protrusion 121. This ensures the sealing effect between the cover plate 110 and the insulating member 120 while reducing the space occupancy of the insulating member 120 in the battery.

[0072] In some embodiments, such as Figures 2 to 5 , Figure 8 and Figure 9As shown, the insulating member 120 forms a third through hole 123, and the positioning assembly 130 includes a first positioning member 131. The first positioning member 131 passes through the third through hole 123 and forms a second through hole 1310. A first notch 13011 is provided on the side of the first positioning member 131 away from the electrode core 910 of the battery cell. The first notch 13011 communicates with the second through hole 1310, and the mounting position 1301 includes the first notch 13011. It should be noted that the shape and size of the third through hole 123 and the first notch 13011 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the third through hole 123 is oval, and the first notch 13011 is square.

[0073] It is understandable that the first positioning member 131 passes through the third through hole 123 formed by the insulating member 120 and forms the second through hole 1310. This can effectively utilize space, reduce the volume of the positioning assembly 130, and enhance the connection stability between the first positioning member 131 and the insulating member 120. At the same time, a first notch 13011 is provided on the top surface of the first positioning member 131 to ensure that the tab 920 can stably extend from the second through hole 1310 to the first notch 13011. The insulating member 120 is used to isolate the cover plate 110 and the first positioning member 131 to ensure the insulation effect.

[0074] It should be noted that, in order to increase the contact area between the tab 920 and the first notch 13011, the end of the tab 920 away from the core 910 is bent to form a folded edge 921, and the bottom surface of the folded edge 921 is in contact with the first notch 13011.

[0075] In some embodiments, such as Figures 3 to 5 , Figure 8 and Figure 9 As shown, the outer wall of the insulating member 120 is provided with a second protrusion 122 along the circumferential direction. The second protrusion 122 is located outside the first through hole 111 and close to the pole core 910. The outer wall of the first positioning member 131 is provided with a third protrusion 1311 along the circumferential direction. The third protrusion 1311 is located outside the third through hole 123 and close to the pole core 910. The two opposite sides of the second protrusion 122 respectively abut against the cover plate 110 and the third protrusion 1311. It should be noted that the shape and size of the third protrusion 1311 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the cross-section of the third protrusion 1311 is elliptical and annular.

[0076] Understandably, the top and bottom surfaces of the second boss 122 abut against the bottom surface of the cover plate 110 and the top surface of the third boss 1311, respectively, thereby enhancing the structural stability of the entire cover plate assembly, making the electrical connection between the tab 920 and the conductive sheet 140 more stable, and reducing the risk of poor contact. At the same time, the third boss 1311 enhances the contact area and extends the sealing path length, improving the sealing effect between the insulating component 120 and the cover plate 110.

[0077] In some embodiments, the first positioning member 131 and the insulating member 120 are interference-fitted to utilize the elastic properties of the insulating member 120 itself to generate elastic pressure, thereby improving the structural stability of the cover plate assembly, maintaining the reliability of the electrical connection between the tab 920 and the conductive sheet 140, and helping to reduce production costs and complexity.

[0078] In some embodiments, such as Figures 1 to 5 , Figure 10 and Figure 11 As shown, the positioning component 130 also includes a second positioning member 132, which is sleeved outside the first positioning member 131 and abuts against the insulating member 120. The second positioning member 132 is provided with a first recess 13012 for accommodating the conductive sheet 140. The bottom wall of the first recess 13012 is provided with a second notch 130121, and the second notch 130121 and the first notch 13011 are connected. The mounting position 1301 also includes the first recess 13012. It should be noted that the shape and size of the first recess 13012 and the second notch 130121 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the first recess 13012 is square, and the second notch 130121 is square.

[0079] Understandably, the second positioning member 132 is sleeved outside the first positioning member 131 and abuts against the insulating member 120, thereby improving additional support and stability while ensuring insulation performance. The second positioning member 132 is provided with a first recess 13012 to accommodate the conductive sheet 140, so that the end of the tab 920 away from the electrode core 910 passes through the second through hole 1310, the first notch 13011 and the second notch 130121 in sequence. Thus, the conductive sheet 140 can be electrically connected to the tab 920 at the same time as the conductive sheet 140 is installed. This improves the utilization of the internal space of the battery and simplifies the steps of connecting the tab 920 and the conductive sheet 140, thereby improving production efficiency.

[0080] In some embodiments, such as Figure 4 and Figure 5 As shown, the second notch 130121 and the first notch 13011 are joined together to form a continuous first plane, so that the end of the tab 920 away from the core 910 is in contact with the first plane.

[0081] It is understandable that by assembling the first positioning member 131 and the second positioning member 132 together, the first notch 13011 on the top surface of the first positioning member 131 and the second notch 130121 at the bottom of the first groove 13012 formed by the second positioning member 132 together form a continuous first plane, which increases the contact area between the tab 920 and the positioning assembly 130 as much as possible, thereby enhancing the mechanical stability of the electrical connection between the tab 920 and the conductive sheet 140.

[0082] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 As shown, the bottom wall of the first sink 13012 and the side of the first positioning member 131 away from the pole core 910 are spliced ​​together to form a continuous second plane, so that the side of the conductive sheet 140 away from the pole core 910 is connected to the second plane.

[0083] Understandably, after the positioning component 130, the battery cell, and the tab 920 are assembled together, the portion of the bottom wall of the first recess 13012 near the second notch 130121 and the portion of the top surface of the first positioning component 131 near the first notch 13011 are joined together to form a second plane, thereby allowing the bottom surface of the conductive sheet 140 to contact the second tab 920 and the second screen respectively. This provides stable support while simplifying the installation process of the conductive sheet 140 and increasing the contact area between the conductive sheet 140 and the positioning component 130, thereby improving the reliability and durability of the cover plate assembly.

[0084] In some embodiments, such as Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 11 As shown, the second positioning member 132 has a fourth through hole 1321 and forms a second recessed groove 1322. The opening of the second recessed groove 1322 is opposite to the opening of the first recessed groove 13012. The fourth through hole 1321 is connected to the first recessed groove 13012 and the second recessed groove 1322 respectively. A fourth boss 1312 is provided circumferentially on the outer wall of the first positioning member 131. The fourth boss 1312 passes through the insulating member 120 and abuts against the second recessed groove 1322. The portion of the outer wall of the first positioning member 131 located away from the pole core 910 abuts against the inner edge of the fourth through hole 1321. It should be noted that the shape and size of the fourth through hole 1321, the second recessed groove 1322 and the fourth boss 1312 can be designed according to actual needs. This embodiment does not impose specific limitations on this. For example, the fourth through hole 1321 is an oval hole, the second recess 1322 is square, and the cross-section of the fourth boss 1312 is an elliptical ring.

[0085] It should be noted that, along the length of the cover plate 110, the length of the top surface of the first positioning member 131 is less than the length of the fourth protrusion 1312, and the length of the fourth protrusion 1312 is less than the length of the third protrusion 1311; along the direction away from the pole core 910, the third protrusion 1311, the fourth protrusion 1312 and the first notch 13011 are arranged in sequence.

[0086] It is understood that the first sink 13012 and the second sink 1322 are respectively disposed at the top and bottom of the second positioning member 132. The top surface of the first positioning member 131 passes through the second sink 1322 and the fourth through hole 1321 in sequence and is spliced ​​with the bottom wall of the first sink 13012 to form a second plane. At the same time, the outer side wall of the fourth boss 1312 is respectively attached to the inner side wall of the second sink 1322 and the inner side wall of the third through hole 123. The outer side wall of the first positioning member 131 at the top is attached to the inner side wall of the fourth through hole 1321, which enhances the connection stability between the positioning assembly 130 and the insulating member 120 and ensures that the connection between the tab 920 and the conductive sheet 140 remains stable during battery use.

[0087] In some embodiments, such as Figures 3 to 6 As shown, a first protrusion 121 is provided circumferentially on the outer side wall of the insulating member 120. The first protrusion 121 is located outside the first through hole 111 and away from the electrode core 910 of the battery cell. The cover plate 110 forms a groove 112. The first through hole 111 is located on the bottom wall of the groove 112. The outer side wall of the second positioning member 132 near the electrode core 910 and the outer side wall of the first protrusion 121 are both abutted against the inner side wall of the groove 112. The sides of the second positioning member 132 and the bottom wall of the groove 112 that are close to each other are abutted against the two sides of the first protrusion 121, respectively. It should be noted that the shape and size of the groove 112 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the groove 112 is square.

[0088] Understandably, the outer wall of the second positioning member 132 near the electrode core 910 and the outer wall of the first boss 121 respectively abut against the inner wall of the groove 112, thereby providing clear guidance and radial limitation for the assembly of the second positioning member 132, and enhancing the mechanical stability of the cover assembly. This helps the insulating member 120 to be better fixed in the groove 112, reducing displacement caused by mechanical vibration or thermal expansion, thereby improving the insulation performance of the battery.

[0089] Meanwhile, the top and bottom surfaces of the first protrusion 121 abut against the bottom surface of the second positioning member 132 and the bottom wall of the groove 112, respectively, thereby enhancing the structural stability of the entire cover assembly, making the electrical connection between the tab 920 and the conductive sheet 140 more stable, and reducing the risk of poor contact. Simultaneously, the contact between the top surface of the first protrusion 121 and the bottom surface of the second positioning member 132 increases the contact area and extends the sealing path length, improving the sealing effect between the insulating member 120 and the cover 110.

[0090] In some embodiments, the second positioning member 132, the insulating member 120 and the cover plate 110 are interference-fitted to utilize the elastic properties of the insulating member 120 itself to generate elastic pressure, thereby improving the structural stability of the cover plate assembly, maintaining the reliability of the electrical connection between the tab 920 and the conductive sheet 140, and helping to reduce production costs and complexity.

[0091] In some embodiments, the conductive sheet 140 and the positioning component 130 are welded together.

[0092] It is understandable that after the cover plate 110, insulating part 120, spacer ring 150, first positioning part 131, first positioning part 131 and second positioning part 132 are assembled in sequence, and then one end of the electrode 920 is ejected to the first notch 13011 and the second notch 130121, it is only necessary to weld the conductive sheet 140 and the positioning component 130 together, thereby greatly saving manufacturing costs and manufacturing efficiency.

[0093] In some embodiments, the welding method includes one of laser welding and brazing.

[0094] Understandably, compared to the secondary welding methods that require riveting and laser welding or brazing and laser welding in related technologies, the single welding method that only requires laser welding or brazing can improve production efficiency and reduce manufacturing costs. It can also reduce the possibility of foreign objects entering the battery cell and improve the electrochemical performance and reliability of the battery.

[0095] In some embodiments, such as Figure 2 and Figure 5 As shown, the second positioning member 132 is connected to the groove surface near the first sink 13012 and the side of the conductive sheet 140 away from the electrode core 910 by laser welding.

[0096] It is understandable that after the conductive sheet 140 is placed in the first sink 13012, the top surface of the conductive sheet 140 and the top surface of the second positioning member 132 near the first sink 13012 are connected by laser welding, which facilitates operation and achieves a sealing effect.

[0097] In other embodiments, such as Figure 1As shown, the side of the first positioning member 131 away from the pole core 910, the inner wall of the first sink 13012, and the side of the conductive sheet 140 near the pole core 910 are connected by brazing.

[0098] Understandably, after one end of the tab 920 is attached to the first notch 13011 and the second notch 130121, solder is laid in the first recess 13012 of the second positioning member 132, the part of the top surface of the first positioning member 131 near the second through hole 1310, and the top surface of the tab 920. Then, the bottom surface of the conductive sheet 140, the inner wall of the first recess 13012, the tab 920 and the top surface of the first positioning member 131 are tightly connected by brazing, which increases the contact area of ​​the connection and improves the connection strength and stability.

[0099] In some embodiments, the materials of the first positioning member 131 and the second positioning member 132 include, but are not limited to, ceramic or metal.

[0100] It should be noted that when the first positioning element 131 is made of ceramic, the weld between the first positioning element 131 and the conductive sheet 140 needs to be plated with a metal layer first.

[0101] In some embodiments, the length and width of the first through hole 111 are e and f, respectively, the length and width of the cover plate 110 are c and d, respectively, and the area of ​​the tab 920 located at the mounting position 1301 is S, satisfying the following formula:

[0102] f≤2 / 3d, and S<2ef≤1 / 2cd.

[0103] It is understandable that the length and width of the folded edge 921 are a and b, respectively. By satisfying the conditions S=ab<2ef≤1 / 2cd and f≤2 / 3d, the mechanical strength of the cover plate 110 is ensured while helping to optimize the internal space of the battery and ensure the effective connection between the tab 920 and the conductive sheet 140. Under the premise of meeting the minimum current flow area of ​​the tab 920, the material cost is saved as much as possible and the internal space utilization of the battery is improved.

[0104] In some embodiments, such as Figures 1 to 4 and Figure 7 As shown, the cover plate assembly also includes a spacer 150, which is disposed on the side of the cover plate 110 near the electrode core 910 of the battery cell and is sleeved on the outside of the insulating member 120.

[0105] Understandably, a spacer 150 is provided between the cover plate 110 and the electrode core 910, so that the top surface of the spacer 150 fits with the bottom surface of the cover plate 110 and is fitted over the insulating component 120, providing additional insulation and positioning for the cell, making the assembly of the insulating component 120 and the cover plate 110 more precise, which helps to improve the reliability of the battery.

[0106] In some embodiments, such as Figure 3 , Figure 4 and Figure 7 As shown, the spacer 150 forms a fifth through hole 151, and a second boss 122 is provided circumferentially on the outer side wall of the insulating member 120; the spacer 150 forms a fifth through hole 151, and the second boss 122 is located outside the first through hole 111 and close to the electrode core 910 of the battery cell, and the second boss 122 is disposed inside the fifth through hole 151. It should be noted that the shape and size of the fifth through hole 151 can be designed according to actual needs, and this embodiment does not impose specific limitations on this. For example, the fifth through hole 151 is an oval hole.

[0107] Understandably, the fit between the outer wall of the second boss 122 and the inner wall of the fifth through hole 151 helps to improve the space utilization and assembly accuracy inside the battery, as well as the radial limiting of the insulating part 120 and the first positioning part 131, thereby enhancing the structural stability of the cover assembly.

[0108] This application also provides a battery.

[0109] like Figure 1 , Figure 2 and Figure 5 As shown, the battery includes a cell, a casing, and the aforementioned cover assembly. The cell is disposed inside the casing, and the cover assembly is connected to both the cell and the casing.

[0110] It should be noted that the battery may include, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited in this regard. The battery may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited in this regard either. Batteries are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited in this regard either.

[0111] According to the battery provided in the embodiments of this application, by having one end of the tab 920 in the cover plate assembly away from the electrode core 910 of the cell pass through the second through hole 1310 formed by the positioning assembly 130 and extend to the mounting position 1301, and electrically connect with the conductive sheet 140, the overall structure of the cover plate assembly is optimized, which not only improves the performance and reliability of the battery, but also reduces production costs and improves production efficiency.

[0112] This application also provides a battery pack comprising a plurality of batteries as described above.

[0113] It should be noted that the number and specific distribution of batteries can be designed according to actual needs, and this embodiment does not impose specific restrictions on this.

[0114] To meet diverse power demands, multiple batteries can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections is used. Multiple batteries can be directly connected in series, parallel, or a combination thereof, and then housed within a casing. Alternatively, multiple batteries can be first connected in series, parallel, or a combination thereof to form battery modules, which are then connected in series, parallel, or a combination thereof to form a single unit housed within the casing. The battery pack may also include other structures; for example, it may include a busbar for electrical connection between the multiple batteries.

[0115] In some embodiments, the multiple battery packs can be arranged along a first direction, and each battery pack includes multiple batteries arranged along a second direction. The first direction and the second direction are the length direction and the width direction of the housing, respectively, and the first direction and the second direction are perpendicular to each other.

[0116] Each battery can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery can be cylindrical, flat, cuboid, or other shapes.

[0117] The battery pack provided in the embodiments of this application achieves optimization in multiple aspects such as space utilization, overcurrent capacity, structural stability, safety, production efficiency and maintenance convenience by using the above-mentioned battery, thereby improving the reliability and cost-effectiveness of the battery pack.

[0118] This application also provides an electrical device, including the battery pack described above.

[0119] It should be noted that electrical equipment refers to devices that use batteries as a power source, and may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0120] The electrical equipment provided according to the embodiments of this application improves the safety and reliability of the electrical equipment by using the above-mentioned battery pack.

[0121] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0122] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0123] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0124] In the description of this application, "multiple" means two or more.

[0125] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0126] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0127] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate (110) has a first through hole (111); An insulating element (120) is sealed through the first through hole (111). A positioning component (130) is mounted on the first through hole (111) via the insulating member (120). The positioning component (130) has a mounting position (1301) and forms a second through hole (1310) communicating with the mounting position (1301) so that the electrode tab (920) portion of the battery cell extends from the second through hole (1310) to the mounting position (1301). A conductive sheet (140) is disposed at the mounting position (1301) and electrically connected to the electrode (920); The insulating element (120) forms a third through hole (123), and the positioning assembly (130) includes: A first positioning member (131) is disposed through the third through hole (123) and forms the second through hole (1310). A first notch (13011) is provided on the side of the first positioning member (131) away from the electrode core (910) of the battery cell. The first notch (13011) is connected to the second through hole (1310). The mounting position (1301) includes the first notch (13011). The second positioning member (132) is sleeved outside the first positioning member (131) and abuts against the insulating member (120). The second positioning member (132) is provided with a first recess (13012) for accommodating the conductive sheet (140). The bottom wall of the first recess (13012) is provided with a second notch (130121), and the second notch (130121) and the first notch (13011) are connected. The mounting position (1301) also includes the first recess (13012). The second notch (130121) and the first notch (13011) are joined together to form a continuous first plane, so that the end of the tab (920) away from the pole core (910) is in contact with the first plane; The bottom wall of the first sink (13012) and the side of the first positioning member (131) away from the pole core (910) are spliced ​​together to form a continuous second plane, so that the side of the conductive sheet (140) away from the pole core (910) is connected to the second plane. The second positioning member (132) is connected to the groove surface near the first sink (13012) and the conductive sheet (140) away from the electrode core (910) by laser welding; or The side of the first positioning member (131) away from the pole core (910), the inner wall of the first sink (13012) and the side of the conductive sheet (140) near the pole core (910) are connected by brazing. The second positioning member (132) has a fourth through hole (1321) and forms a second recess (1322). The opening of the second recess (1322) and the opening of the first recess (13012) are opposite to each other. The fourth through hole (1321) is connected to the first recess (13012) and the second recess (1322) respectively. The outer wall of the first positioning member (131) is provided with a fourth boss (1312) along the circumferential direction. The fourth boss (1312) passes through the insulating member (120) and abuts against the second recess (1322). The outer wall portion of the first positioning member (131) located on the fourth boss (1312) away from the pole core (910) abuts against the inner edge of the fourth through hole (1321).

2. The cover plate assembly according to claim 1, characterized in that, The outer side wall of the insulating component (120) is provided with a first boss (121) and a second boss (122) along the circumferential direction. The first boss (121) is located outside the first through hole (111) and away from the electrode core (910) of the battery cell. The second boss (122) is located outside the first through hole (111) and close to the electrode core (910). The sides of the first boss (121) and the second boss (122) that are close to each other abut against the two sides of the cover plate (110).

3. The cover plate assembly according to claim 2, characterized in that, Along the length of the cover plate (110), the length of the first boss (121) is greater than the length of the second boss (122).

4. The cover plate assembly according to claim 1, characterized in that, The outer side wall of the insulating member (120) is provided with a second boss (122) along the circumferential direction. The second boss (122) is located outside the first through hole (111) and close to the pole core (910). The outer side wall of the first positioning member (131) is provided with a third boss (1311) along the circumferential direction. The third boss (1311) is located outside the third through hole (123) and close to the pole core (910). The two opposite sides of the second boss (122) respectively abut against the cover plate (110) and the third boss (1311).

5. The cover plate assembly according to claim 1, characterized in that, The outer side wall of the insulating member (120) is provided with a first boss (121) along the circumferential direction. The first boss (121) is located outside the first through hole (111) and away from the electrode core (910) of the battery cell. The cover plate (110) forms a groove (112). The first through hole (111) is located on the bottom wall of the groove (112). The second positioning member (132) is close to the outer side wall of the electrode core (910) and the outer side wall of the first boss (121) are both in abutting and cooperating with the inner side wall of the groove (112). The sides of the second positioning member (132) and the bottom wall of the groove (112) that are close to each other are respectively in abutting and cooperating with the two sides of the first boss (121).

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that, Also includes: A spacer (150) is disposed on the side of the cover plate (110) near the electrode core (910) of the battery cell and is sleeved on the outside of the insulating member (120).

7. The cover plate assembly according to claim 6, characterized in that, The spacer (150) forms a fifth through hole (151). The outer wall of the insulating member (120) is provided with a second boss (122) along the circumferential direction. The second boss (122) is located outside the first through hole (111) and close to the electrode core (910) of the battery cell. The second boss (122) is located inside the fifth through hole (151).

8. The cover plate assembly according to claim 1, characterized in that, The conductive sheet (140) and the positioning component (130) are welded together.

9. The cover plate assembly according to claim 8, characterized in that, The welding method includes one of laser welding and brazing.

10. The cover plate assembly according to claim 1, characterized in that, The length and width of the first through hole (111) are e and f, respectively; the length and width of the cover plate (110) are c and d, respectively; and the area of ​​the electrode tab (920) located at the mounting position (1301) is S, satisfying the following formula: f≤2 / 3d, and S<2ef≤1 / 2cd.

11. A battery, characterized in that, include: Battery cell; The housing contains the battery cell. as well as The cover plate assembly as claimed in any one of claims 1 to 10, wherein the cover plate assembly is connected to the battery cell and the housing, respectively.

12. A battery pack, characterized in that, include: Multiple batteries as described in claim 11.

13. An electrical appliance, characterized in that, Includes the battery pack as described in claim 12.

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