Top cover and single battery

Abstract

The utility model provides a top cover and a single battery. The top cover comprises a cover plate assembly; the electrode terminal comprises a cylinder penetrating through the cover plate assembly; the connecting plate comprises a pole connecting part and a tab connecting part used for being connected with the tab, and the pole connecting part is electrically connected with the pole body; the tab connecting part comprises a first tab connecting part and a second tab connecting part which are formed by extending the pole connecting part towards the two sides of the pole connecting part along the width direction of the cover plate assembly, and the first tab connecting part and the second tab connecting part respectively comprise a first connecting part and a second connecting part; the first connecting part and the second connecting part can be bent relative to the pole connecting part; according to the application, the tab connecting part can be far away from the cover plate assembly, heat accumulation at the electrode terminal is reduced, and a lower plastic part of the cover plate assembly is prevented from being fused, so that the damage risk of the battery is reduced, and the application safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a top cover and a single battery. BACKGROUND

[0002] As a common single battery, the square case battery is widely used in daily production and life.

[0003] Currently, for the connection process of the electrode terminal and the tab, the ultrasonic welding technology is usually used to pre-weld the tab, and then the laser welding technology is used to directly connect the tab and the electrode terminal, or to connect through an adapter piece. However, due to the accumulation of heat in the electrode terminal during the laser welding process, the lower plastic part of the cover plate assembly is easily melted, increasing the risk of battery damage and safety hazards. UTILITY MODEL CONTENT

[0004] Therefore, the present application aims to provide a top cover and a single battery to solve the above-mentioned technical problems.

[0005] To achieve the above purpose, the first aspect of the present application provides a top cover, comprising:

[0006] a cover plate assembly;

[0007] an electrode terminal comprising a column body penetrating through the cover plate assembly;

[0008] a connecting plate comprising a tab connecting portion and a tab connecting portion for connecting a tab, the tab connecting portion being electrically connected with the column body; the tab connecting portion comprises a first tab connecting portion and a second tab connecting portion extending from the tab connecting portion to both sides of the tab connecting portion along the width direction of the cover plate assembly, the first tab connecting portion and the second tab connecting portion each comprise a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being foldable relative to the tab connecting portion.

[0009] The second aspect of the present application further provides a single battery, comprising:

[0010] a housing having an opening;

[0011] a cover plate assembly closing the opening;

[0012] an electrode assembly accommodated in the housing, the electrode assembly comprising a main body and a tab extending from the main body to the cover plate assembly;

[0013] an electrode terminal comprising a column body penetrating through the cover plate assembly;

[0014] The connecting plate comprises a pole post connecting portion and a tab connecting portion for connecting the tab, the pole post connecting portion is electrically connected with the pole post, the tab connecting portion comprises a first tab connecting portion and a second tab connecting portion which are formed by extending the pole post connecting portion to both sides of the pole post connecting portion along the width direction of the cover plate assembly, the first tab connecting portion and the second tab connecting portion each comprise a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are each bendably connected with the pole post connecting portion, and at least part of the tab is located between the first connecting portion and the second connecting portion.

[0015] As can be seen from the above, the top cover and the single battery provided by the application, the tab connecting portion of the top cover comprises a first tab connecting portion and a second tab connecting portion which are formed by extending the pole post connecting portion to both sides of the pole post connecting portion, and the first tab connecting portion and the second tab connecting portion each comprise a first connecting portion and a second connecting portion which are bendable relative to the pole post connecting portion, the tab connecting portion can be moved away from the cover plate assembly in the process of welding the tab and the connecting plate, the heat accumulation at the electrode terminal is reduced, the lower plastic part of the cover plate assembly is prevented from melting, and the risk of damage to the battery is reduced, and the safety of the battery application is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a schematic view of the top cover in the first perspective of the application;

[0018] Figure 2 It is a schematic view of the top cover in the second perspective of the application;

[0019] Figure 3 It is a sectional view of the top cover of one embodiment of the application;

[0020] Figure 4 It is a sectional view of the top cover of another embodiment of the application;

[0021] Figure 5 It is a schematic view of the welding condition of the tab connecting portion and the tab in the application;

[0022] Figure 6 It is a schematic view of the connection between the top cover and the electrode assembly in the application;

[0023] Figure 7 It is a schematic view of the single battery in the application;

[0024] Figure 8 is an exploded view of a single battery in the present application;

[0025] Figure 9 is a sectional view of a single battery in the present application.

[0026] Explanation of Reference Signs:

[0027] 1, cover plate assembly;

[0028] 2, electrode terminal; 210, post; 220, post base plate;

[0029] 3, connecting plate; 310, post connecting portion; 3201, first tab connecting portion; 3202, second tab connecting portion; 321, first connecting portion; 322, second connecting portion; 323, crease;

[0030] 4, housing;

[0031] 5, opening;

[0032] 6, electrode assembly; 610, main body; 620, tab; 621, ultrasonic welding mark;

[0033] 701, welding seat; 702, welding head. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the specific embodiments and the accompanying drawings.

[0035] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms "first", "second" and similar terms used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "including", "containing" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0036] For single battery such as prismatic battery, the tab of electrode assembly is usually pre-welded by ultrasonic welding technology, and then the tab is directly connected with the pole column bottom plate of electrode terminal by laser welding technology, or connected through adapter plate. When the tab is directly connected with the pole column bottom plate, the difficulty of battery assembly can be reduced, and the space utilization of battery can be optimized.

[0037] However, the applicant finds that obvious heat effect is generated during laser welding, which is easy to accumulate heat in the electrode terminal and make the electrode terminal rapidly heat up. When the temperature of the electrode terminal is high, the lower plastic part of the cover plate assembly may be melted. When the lower plastic part is in the melted state, the electrode terminal may contact the metal cover of the cover plate assembly, which increases the risk of battery short circuit. In addition, the small molten beads formed by melting may fall into the electrode assembly, which may cause the diaphragm in the electrode assembly to wear and short circuit, thereby threatening the safety of the battery.

[0038] In a first aspect of the present application, a top cover is provided, which is combined with Figures 1-6 The top cover is described in detail with the content shown.

[0039] A top cover includes a cover plate assembly 1, an electrode terminal 2, and a connecting plate 3. The electrode terminal 2 includes a column body 210 penetrating the cover plate assembly 1. The connecting plate 3 includes a pole column connecting part 310 and a tab connecting part for connecting a tab 620. The pole column connecting part 310 is electrically connected with the column body 210. The tab connecting part includes a first tab connecting part 3201 and a second tab connecting part 3202 formed by extending the pole column connecting part 310 along the width direction of the cover plate assembly 1 to both sides of the pole column connecting part 310. The first tab connecting part 3201 and the second tab connecting part 3202 each include a first connecting part 321 and a second connecting part 322, which can be bent relative to the pole column connecting part 310.

[0040] Please refer to Figures 1-6 , Figure 1 Fig. 1 is a schematic view of the top cover in the first perspective of the present application, Figure 2 Fig. 2 is a schematic view of the top cover in the second perspective of the present application, Figure 3 Fig. 3 is a sectional view of the top cover of an embodiment of the present application, Figure 4 Fig. 4 is a sectional view of the top cover of another embodiment of the present application, Figure 5 Fig. 5 is a schematic view of the welding condition of the tab connecting part and the tab 620 in the present application, Figure 6 Fig. 6 is a schematic view of the connection between the top cover and the electrode assembly 6 in the present application.

[0041] Specifically, as Figures 1-4As shown, the cover plate assembly 1 is provided with electrode terminals 2, and the electrode terminals 2 include a column 210 that penetrates the cover plate assembly 1; at this time, the cover plate assembly 1 supports the electrode terminals 2; the column 210 of the electrode terminals 2 penetrates the cover plate assembly 1 and extends to opposite sides of the cover plate assembly 1 respectively, one end of which can form an electrical connection with the tab 620 of the electrode assembly 6, and the other end can form an electrical connection with an external electrical device, so that the battery with the top cover can achieve the corresponding electrical cycle.

[0042] For example, the cover plate assembly 1 may be provided with two kinds of electrode terminals 2, namely positive and negative, wherein the positive electrode is formed of aluminum and the negative electrode is formed of copper.

[0043] For example, the cover assembly 1 may be provided with an explosion-proof component for releasing high-temperature, high-pressure gases and ejected materials during battery thermal runaway.

[0044] For example, the cover assembly 1 may be provided with an injection hole for injecting electrolyte into the battery.

[0045] Furthermore, such as Figures 1-4 and Figure 6 As shown, the connecting plate 3 is located on one side of the cover plate assembly 1. The connecting plate 3 includes a terminal post connecting portion 310 and a tab connecting portion for connecting the tabs 620. The terminal post connecting portion 310 is electrically connected to the pillar 210 so that an electrical connection is achieved between the terminal post connecting portion 310 and the pillar 210. The tab connecting portion includes a first tab connecting portion 3201 and a second tab connecting portion 3202 formed by extending the terminal post connecting portion 310 along the width direction of the cover plate assembly 1 to both sides of the terminal post connecting portion 310, so as to provide connection positions for the tabs 620 of the electrode assembly 6 on opposite sides of the terminal post connecting plate 3, and establish an electrical connection relationship with the electrode terminal 2 through the interconnected tab connecting portion and terminal post connecting portion 310 to form the internal circuit structure of the battery.

[0046] Furthermore, such as Figures 1-4 and Figure 6 The first tab connection portion 3201 and the second tab connection portion 3202 both include a first connection portion 321 and a second connection portion 322 that can be bent relative to the terminal post connection portion 310. Specifically, when welding the first tab connection portion 3201 and / or the second tab connection portion 3202 to the corresponding tab 620, since the first connection portion 321 and the second connection portion 322 can be bent relative to the terminal post connection portion 310 in a direction away from the cover plate assembly 1, the first tab connection portion 3201 and the second tab connection portion 3202 can be kept away from the cover plate assembly 1, thereby reducing the heat transferred to the electrode terminal 2 during the welding process, reducing the degree of heat accumulation at the electrode terminal 2, and preventing the electrode terminal 2 from rising too high and causing the lower plastic part of the cover plate assembly 1 to melt. This helps to reduce the risk of battery damage and improve the safety of battery application.

[0047] For example, such as Figures 1-6 As shown, for cover plate assembly 1, the width direction of cover plate assembly 1 can be set as the X direction, and its length direction can be set as the Y direction. Therefore, the X direction and the Y direction are perpendicular to each other.

[0048] In some embodiments, the bendable angles of the first connecting portion 321 and the second connecting portion 322 relative to the pole post connecting portion 310 are both 90°-180°, at which point the first connecting portion 321 and the second connecting portion 322 have good bending performance. This allows for a larger operating space between the first pole tab connecting portion 3201 and the cover plate assembly 1, and between the second pole tab connecting portion 3202 and the cover plate assembly 1, facilitating welding operations and preventing improper installation of welding tools from affecting the connection effect between the pole tab 620 and the connecting plate 3.

[0049] For example, when the first connecting portion 321 and the second connecting portion 322 are bent at 90° relative to the pole connecting portion 310, the operating space formed between the first pole connecting portion 3201 and the cover plate assembly 1 and between the second pole connecting portion 3202 and the cover plate assembly 1 is the largest, so the welding effect on the pole 620 is the best.

[0050] In some embodiments, such as Figures 1-4 As shown, the first connecting portion 321 is closer to the cover plate assembly 1 than the second connecting portion 322. Specifically, when both the first connecting portion 321 and the second connecting portion 322 are parallel to the cover plate assembly 1, the first connecting portion 321 and the second connecting portion 322 are stacked.

[0051] More specifically, when both the first connecting portion 321 and the second connecting portion 322 are bent in a direction away from the cover plate assembly 1, if the bending angles of the first connecting portion 321 and the second connecting portion 322 are different, a gap can be formed between the first connecting portion 321 and the second connecting portion 322 to accommodate the tab 620, so as to accommodate the tab 620 of the electrode assembly 6 before welding, and the tab 620 is overlapped with the first connecting portion 321 and the second connecting portion 322 respectively, so as to carry out welding later; if the bending angles of the first connecting portion 321 and the second connecting portion 322 are the same, and the tab 620 is located between the two, the first connecting portion 321 and the second connecting portion can fully contact the tab 620. At this time, the tab connecting portion and the tab 620 can be welded by laser welding technology or ultrasonic welding technology to ensure the welding quality of the tab 620.

[0052] In some embodiments, the orthographic projections of the first connecting portion 321 and the second connecting portion 322 onto the cover plate assembly 1 are both located within the cover plate assembly 1. Specifically, as shown below... Figures 1-4As shown, this allows for control over the extension length of the first connecting portion 321 and the second connecting portion 322 in the width direction of the cover plate assembly 1, ensuring sufficient connection area while avoiding excessive extension length that could affect the subsequent assembly of the electrode assembly 6 and the cover plate assembly 1 into the housing.

[0053] In some embodiments, creases 323 are provided between the first connecting portion 321 and the pole connecting portion 310, and between the second connecting portion 322 and the pole connecting portion 310, and the creases 323 extend in a straight line along the length direction of the cover plate assembly 1.

[0054] Specifically, such as Figures 1-4 As shown, by providing creases 323 between the first connecting portion 321 and the pole post connecting portion 310, and between the second connecting portion 322 and the pole post connecting portion 310, and making the extension direction of the creases 323 the same as the length direction of the cover plate assembly 1, the bending difficulty of the first connecting portion 321 and the second connecting portion 322 can be reduced. At the same time, the deformation of the surfaces of the first connecting portion 321 and the second connecting portion 322 can be reduced, ensuring that the first connecting portion 321 and the second connecting portion 322 can make full contact with the pole tab 620 and form a large area of ​​connection.

[0055] More specifically, due to the presence of crease 323, when the tab connection is bent in a direction away from the cover plate assembly 1, the mutual constraint force between the tab connection and the pole post connection 310 can be reduced, so that it can be bent to a suitable angle, avoiding excessive constraint of the tab connection on the tab 620 and causing damage to the tab 620.

[0056] In some embodiments, such as Figures 1-4 As shown, the first connecting part 321 and the pole post connecting part 310, as well as the second connecting part 322 and the pole post connecting part 310, are integrally formed; this can ensure good connection strength between the first connecting part 321 and the pole post connecting part 310, and between the second connecting part 322 and the pole post connecting part 310.

[0057] In some embodiments, such as Figure 3 As shown, the connecting plate 3 and the end of the column 210 are integrally formed and connected; this can ensure that there is good connection strength between the column 210 of the electrode terminal 2 and the connecting plate 3; at the same time, it can also reduce the assembly process of the top cover, thereby controlling the production cost of the battery.

[0058] As an alternative embodiment, such as Figure 4As shown, electrode terminal 2 also includes electrode base plate 220, with opposite sides of electrode base plate 220 connected to column body 210 and connecting plate 3, respectively. Specifically, before welding electrode tab 620, one side of electrode base plate 220 can be welded to the end of column body 210, and then the other side of electrode base plate 220 can be welded to connecting plate 3. This can reduce interference between cover plate assembly 1 and welding tool during welding, and ensure the connection quality between electrode terminal 2 and connecting plate 3.

[0059] In some embodiments, such as Figure 5 As shown, the first connecting part 321 and the second connecting part 322 are provided with ultrasonic weld marks 621 formed by ultrasonic welding, and the electrode tab 620 is welded to the first connecting part 321 and the second connecting part 322 respectively through the ultrasonic weld marks 621.

[0060] Ultrasonic welding technology utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the surfaces of the two objects rub against each other, forming a fusion between molecular layers. Compared with laser welding technology, ultrasonic welding technology forms a smaller heat-affected zone, has higher precision and consistency, and is simpler to operate and safer.

[0061] Therefore, the electrode connector and the electrode 620 in this application can be connected using ultrasonic welding technology. The high-precision and consistent weld marks formed by ultrasonic welding allow for a one-time welding connection between the electrode connector and the electrode 620, simplifying the assembly process between the electrode terminal 2 and the electrode 620, reducing equipment and process costs, and improving production efficiency. Because the heat-affected zone of the ultrasonic weld mark 621 is small, the heat impact on the cover plate assembly 1 is also relatively small.

[0062] For example, with Figure 5 Taking the demonstration content as an example and for illustration, the ultrasonic welding device used for welding the tab 620 and the tab connection part includes, but is not limited to, the welding head 702 and the welding seat 701. Specifically, when welding the tab 620, the tab connection part is bent away from the cover plate assembly 1, and then the tab 620 is inserted between two adjacent tab connection parts. The tab 620 is smoothed through the tab connection part so that an overlapping area is formed between the first connection part 321, the tab 620 and the second connection part 322 of the tab connection part. Then, the first connection part 321 and the second connection part 322 are bent to 90° respectively, and the overlapping area is placed on the surface of the welding seat 701. The welding head 702 is used to smooth and compact the overlapping area. At this time, the welding head 702 and the welding seat 701 perform ultrasonic welding on the overlapping area and form ultrasonic welding, thereby welding the tab 620 between the first connection part 321 and the second connection part 322.

[0063] Furthermore, when using ultrasonic welding, since the electrode connection is in a bent state and far away from the cover plate assembly 1, the impact of the ultrasonic welding process on the lower plastic part of the cover plate assembly 1 can be reduced.

[0064] A second aspect of this application also provides a single-cell battery that can improve the production yield and quality of single-cell batteries, combined with Figures 1-9 The exhibit provides a detailed description of the individual battery cell.

[0065] A single-cell battery includes a housing 4, a cover assembly 1, an electrode assembly 6, electrode terminals 2, and a connecting plate 3. The housing 4 has an opening 5; the cover assembly 1 closes the opening 5; the electrode assembly 6 is housed within the housing 4, and the electrode assembly 6 includes a body 610 and electrode tabs 620 extending from the body 610 towards the cover assembly 1; the electrode terminals 2 include a post 210 penetrating through the cover assembly 1; the connecting plate 3 includes a post connecting portion 310 and a tab connecting portion for connecting the electrode tabs 620, the post connecting portion 310 being electrically connected to the post 210. The ear connection portion includes a first ear connection portion 3201 and a second ear connection portion 3202 formed by the extension of the pole post connection portion 310 along the width direction of the cover plate assembly 1 to both sides of the pole post connection portion 310. The first ear connection portion 3201 and the second ear connection portion 3202 each include a first connection portion 321 and a second connection portion 322. The first connection portion 321 and the second connection portion 322 are both bendably connected to the pole post connection portion 310. At least a portion of the ear 620 is located between the first connection portion 321 and the second connection portion 322.

[0066] Please see Figures 7-9 , Figure 7 This is a schematic diagram of a single cell in this application. Figure 8 This is an exploded view of a single cell in this application. Figure 9 This is a cross-sectional view of a single cell in this application.

[0067] Specifically, such as Figure 8 As shown, the housing 4 has an opening 5 on one side, and an open cavity is formed inside the housing 4 to accommodate the electrode assembly 6 and related components such as electrolyte.

[0068] For example, the housing 4 may be formed of aluminum and related alloys, which are strong and lightweight.

[0069] For example, the inner surface of the housing 4 may be coated with a chemically stable, corrosion-resistant and insulating coating such as polyurethane or ceramic coating, which can extend the service life of the housing 4.

[0070] Furthermore, such as Figures 7-9As shown, in addition to providing mounting positions for the electrode terminals 2, the cover assembly 1 can also close the opening 5 of the housing 4 to maintain the stability and reliability of the internal environment of the single cell.

[0071] For example, the cover assembly 1 may be provided with an explosion-proof component for releasing high-temperature, high-pressure gases and ejected materials during thermal runaway of a single cell.

[0072] For example, the cover assembly 1 may be provided with an injection hole for injecting electrolyte into the interior of a single cell.

[0073] Furthermore, such as Figure 6 , Figure 8 and Figure 9 As shown, the electrode assembly 6 is housed within the cavity of the housing 4 and immersed in the electrolyte to enable the single cell to perform charging or discharging functions. Specifically, the electrode assembly 6 includes a body 610 and tabs 620. The tabs 620 extend toward the electrode assembly 6 and are electrically connected to the connecting plate 3, forming the internal circuit structure of the single cell. More specifically, the body 610 may include a positive electrode, a negative electrode, and a separator for isolating the positive and negative electrodes. The positive and negative electrodes are electrically connected to the positive and negative electrodes respectively through corresponding tabs 620, and store and release energy through chemical reactions in the electrolyte. The separator allows ions in the electrolyte to migrate freely during the electro-cycling process and prevents the positive and negative electrodes from contacting each other and causing a short circuit.

[0074] Furthermore, such as Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, the column 210 of the electrode terminal 2 penetrates the cover plate assembly 1 and extends to its opposite sides. One end of the column is electrically connected to the tab 620 of the electrode assembly 6, and the other end can be electrically connected to external electrical equipment.

[0075] Furthermore, such as Figure 1 , Figure 2 and Figure 9 As shown, the connecting plate 3 is located on one side of the cover plate assembly 1. The connecting plate 3 includes a terminal post connecting portion 310 and a tab connecting portion for connecting the tabs 620. The terminal post connecting portion 310 is electrically connected to the pillar 210 to form an electrical connection between the terminal post connecting portion 310 and the pillar 210. The tab connecting portion includes a first tab connecting portion 3201 and a second tab connecting portion 3202 formed by extending the terminal post connecting portion 310 along the width direction of the cover plate assembly 1 to both sides of the terminal post connecting portion 310, so as to connect to the tabs 620 of the electrode assembly 6 on opposite sides of the terminal post connecting portion 310 respectively, and form an electrical connection relationship with the electrode terminal 2 through the interconnected tab connecting portion and terminal post connecting portion 310 to form the internal circuit structure of the battery.

[0076] Furthermore, such as Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, both the first tab connection portion 3201 and the second tab connection portion 3202 include a first connection portion 321 and a second connection portion 322. Both the first connection portion 321 and the second connection portion 322 are bendably connected to the electrode post connection portion 310. At least a portion of the tabs 620 are located between the first connection portion 321 and the second connection portion 322. Specifically, when the electrode assembly 6 is installed inside the housing 4 and the cover plate assembly 1 is installed at the opening 5 of the housing 4, at least a portion of the tabs 620 are located between the first connection portion 321 and the second connection portion 322, so that the tabs 620 establish an electrical connection with the electrode post connection portion 310 through the first tab connection portion 3201 and the second tab connection portion 3202, thereby enabling the electrode assembly 6 to achieve an electrical connection with the electrode terminal 2.

[0077] More specifically, since the first connecting portion 321 and the second connecting portion 322 are bendable relative to the terminal connecting portion 310, the constraint force of the first terminal connecting portion 3201 on the terminal 620 and the constraint force of the second terminal connecting portion 3202 on the terminal 620 in the single cell can be reduced, thereby reducing the degree of bending of the terminal 620 in the housing 4, avoiding damage to the terminal 620 due to excessive bending, improving the yield of the single cell and improving its overall quality.

[0078] In some embodiments, such as Figure 3 and Figure 4 As shown, the second connecting portion 322 is closer to the main body 610 than the first connecting portion 321. This allows the tab 620 to be clamped between the first connecting portion 321 and the second connecting portion 322, ensuring the reliability of the connection between the tab 620 and the first tab connecting portion 3201, as well as the reliability of the connection between the tab 620 and the second connecting portion 322.

[0079] In some embodiments, such as Figure 9 As shown, the extension direction of the tab connection portion is opposite to the extension direction of the tab 620. Specifically, the tab connection portion extends in the width direction of the cover plate assembly 1 toward the pole connection portion 310 to form a first tab connection portion 3201 and a second tab 620. By setting the extension direction of the tab connection portion opposite to the extension direction of the tab 620, a larger connection area can be formed between the tab 620 and the tab connection portion, which helps to increase the connection strength between the tab 620 and the tab connection portion.

[0080] More specifically, such as Figure 9As shown, when the extension direction of the tab connection is opposite to the extension direction of the tab 620, the end of the tab 620 is located between the first connection 321 and the second connection 322 and is positioned towards the pole post connection 310. Therefore, at least a portion of the end of the tab 620 can be hidden between the first connection 321 and the second connection 322, avoiding the problem of the tab 620 being inserted backwards during assembly.

[0081] For example, one tab 620 may be provided between the first connecting part 321 and the second connecting part 322, or multiple tabs 620 may be provided.

[0082] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0083] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0085] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0086] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0087] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A top cover, characterized in that, include: Cover plate assembly; Electrode terminals, including pillars extending through the cover plate assembly; A connecting plate includes a pole post connecting portion and a tab connecting portion for connecting tabs, wherein the pole post connecting portion is electrically connected to the pole body; the tab connecting portion includes a first tab connecting portion and a second tab connecting portion formed by extending the pole post connecting portion along the width direction of the cover plate assembly to both sides of the pole post connecting portion, wherein both the first tab connecting portion and the second tab connecting portion include a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are bendable relative to the pole post connecting portion.

2. The top cover according to claim 1, characterized in that, The bendable angles of the first connecting part and the second connecting part relative to the pole connecting part are both 90°-180°.

3. The top cover according to claim 1, characterized in that, The first connecting portion is closer to the cover plate assembly than the second connecting portion, so that a gap is formed between the first connecting portion and the second connecting portion to accommodate the tab.

4. The top cover according to claim 1, characterized in that, The first connecting portion and the second connecting portion are both located within the cover plate assembly in their orthographic projections.

5. The top cover according to claim 1, characterized in that, A crease is provided between the first connecting part and the pole connecting part, and between the second connecting part and the pole connecting part, and the crease extends in a straight line along the length direction of the cover plate assembly.

6. The top cover according to claim 1, characterized in that, The first connecting part and the pole connecting part, as well as the second connecting part and the pole connecting part, are integrally formed.

7. The top cover according to claim 1, characterized in that, The connecting plate is integrally formed and connected to the end of the column; or... The electrode terminal also includes an electrode base plate, the opposite sides of which are connected to the column body and the connecting plate, respectively.

8. A single-cell battery, characterized in that, include: The shell has an opening; Cover plate assembly, to close the opening; An electrode assembly, housed within the housing, the electrode assembly comprising a body and tabs extending from the body toward the cover assembly; Electrode terminals, including pillars extending through the cover plate assembly; A connecting plate includes a pole post connecting portion and a tab connecting portion for connecting the tabs. The pole post connecting portion is electrically connected to the pole body. The tab connecting portion includes a first tab connecting portion and a second tab connecting portion formed by extending the pole post connecting portion along the width direction of the cover plate assembly to both sides of the pole post connecting portion. Both the first tab connecting portion and the second tab connecting portion include a first connecting portion and a second connecting portion. Both the first connecting portion and the second connecting portion are flexibly connected to the pole post connecting portion. At least a portion of the tabs is located between the first connecting portion and the second connecting portion.

9. The single-cell battery according to claim 8, characterized in that, The second connecting portion is closer to the main body than the first connecting portion.

10. The single-cell battery according to claim 8, characterized in that, The extension direction of the electrode connector is opposite to the extension direction of the electrode.

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