Cover plate assembly, battery and electric device

Abstract

The utility model discloses a cover plate assembly which comprises a cover plate body and a pole assembly, and the cover plate body is provided with a first through hole; the pole assembly covers the first through hole, the pole assembly and the cover plate body are welded at the lap joint position of the pole assembly and the cover plate body, and the pole assembly comprises a first end face used for being connected with a pole lug on a battery cell; the end face, provided with the tabs, of the battery cell is a second end face; in the thickness direction of the cover plate body, an accommodating space for accommodating a tab is formed between the first end surface and the second end surface. Therefore, the cover plate assembly has the accommodating space for the tabs, so that the tabs can be conveniently connected with the pole columns, an adapter plate can be omitted, and the space utilization rate of the battery cell is improved. The pole assembly and the cover plate body are welded at the lap joint position of the pole assembly and the cover plate body, the pole assembly and the cover plate body have a supporting relationship at the lap joint position, the lap joint has a successive relationship of placing components, and the components placed later are far away from the interior of the battery, so that the welding operation at the lap joint position can be performed outside the battery, and welding slag, molten dust and the like are prevented from falling into the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically to a cover plate assembly, a battery including the aforementioned cover plate assembly, and an electrical device including the aforementioned battery. Background Technology

[0002] The existing power battery cover uses a bottom-applied adhesive process during production, which requires welding adapter pieces. The space in the height direction inside the battery cannot be fully utilized. Since the welding process is located inside the battery, foreign objects such as welding slag and molten dust may fall into the battery during the welding process, posing a risk of short circuit. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a cover plate assembly, a battery, and an electrical device that can solve the problem that during the production of the cover plate, foreign objects such as welding slag and molten dust may fall into the battery and cause a short circuit.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A cover plate assembly, comprising:

[0006] The cover plate body has a first through hole;

[0007] A terminal assembly covering the first through hole, the terminal assembly being welded to the cover plate body at their overlapping position, the terminal assembly including a first end face for connecting to a tab on the battery cell;

[0008] The end face of the battery cell where the tab is located is the second end face;

[0009] Along the thickness direction of the cover plate body, a receiving space for accommodating the electrode tab is provided between the first end face and the second end face.

[0010] Optionally, in the above-mentioned cover plate assembly, the side of the cover plate body closest to the battery cell protrudes outward to form a convex hull structure in the direction away from the battery cell, the first through hole is opened in the convex hull structure, and the convex hull structure includes the receiving space.

[0011] Optionally, in the above-described cover plate assembly, the pole assembly includes:

[0012] The electrode post, wherein the end face of the electrode post near the electrode tab is the first end face;

[0013] The welding component is sleeved on the outer circumferential side of the pole post, and the welding component is welded to the cover plate body at their overlapping position.

[0014] There is a circumferential gap between the pole and the welded part; an insulating element is provided in the gap.

[0015] Optionally, in the above-mentioned cover plate assembly, the first through hole is a stepped through hole, and the stepped through hole has a first step surface;

[0016] The welded component has a contact surface that abuts against the first step surface along the thickness direction.

[0017] Optionally, in the above-mentioned cover plate assembly, the stepped through hole includes a first hole section near the electrode tab and a second hole section away from the electrode tab;

[0018] Along the radial section of the first through hole, the cross-sectional area of ​​the first hole segment is smaller than the cross-sectional area of ​​the second hole segment;

[0019] Along the thickness direction, the contact surface of the welded component overlaps the first step surface of the cover plate body.

[0020] Optionally, in the above-mentioned cover plate assembly, the stepped through hole includes a first hole section near the electrode tab and a second hole section away from the electrode tab;

[0021] Along the radial section of the first through hole, the cross-sectional area of ​​the first hole segment is greater than the cross-sectional area of ​​the second hole segment;

[0022] Along the thickness direction, the first stepped surface of the cover plate body overlaps the contact surface of the welded component.

[0023] Optionally, the cover plate assembly further includes an insulating sheet disposed on the surface of the cover plate body near the battery cell, and the insulating sheet is provided with a second through hole communicating with the first through hole.

[0024] Optionally, in the above-mentioned cover plate assembly, the insulating sheet has a first limiting portion, the insulating member has a second limiting portion, and the first limiting portion and the second limiting portion are engaged.

[0025] A battery includes the aforementioned cover assembly; two battery cells are provided, one of which has a first tab and the other has a second tab;

[0026] in,

[0027] The first electrode and the second electrode merge to form an electrode near the position where the first electrode extends out of the battery cell. The electrode includes a folding section, a bending section, and a connecting section. The folding section connects to the two battery cells respectively. The connecting section is electrically connected to the first end face. The bending section connects the folding section and the connecting section. The bending section is formed by bending the folding section toward the second electrode.

[0028] Alternatively, the first tab and the second tab may be joined together near the point where the two battery cells abut to form a tab. The tab includes a folding section, a bending section, and a connecting section. The folding section is connected to the two battery cells respectively. The connecting section is electrically connected to the first end face. The bending section connects the folding section and the connecting section. The bending section bends from the folding section toward the first tab, and the connecting section bends from the bending section toward the second tab.

[0029] Alternatively, the first electrode tab is bent away from the second electrode tab and then electrically connected to the first end face, and the second electrode tab is bent away from the first electrode tab and then electrically connected to the first end face.

[0030] An electrical device includes the aforementioned battery.

[0031] As can be seen from the above technical solution, the cover plate assembly and battery of this utility model have a receiving space between the first end face of the terminal assembly and the second end face of the cell for accommodating the tab. The presence of this space facilitates the connection between the tab and the terminal, eliminating the need for an adapter plate and thus eliminating the need for adapter plate welding. This improves the space utilization of the cell, which is beneficial for increasing capacity and reducing component costs. Simultaneously, it helps reduce the internal resistance of the cell, enhances current carrying capacity, and reduces the path between the tab and the terminal, thereby enhancing heat conduction and dissipation. Furthermore, the terminal assembly covers the through holes on the cover plate body, and the terminal assembly and the cover plate body are welded at their overlapping position. This overlap necessarily creates a supporting relationship at the overlapping position, and the components are placed sequentially, with the later-placed component further away from the battery interior. This allows the welding operation at the overlapping position to be performed outside the battery, enabling visible welding and preventing weld slag and molten dust from falling into the battery, thus avoiding the risk of short circuits. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A cross-sectional view along the thickness direction of the battery provided in Embodiment 1 of this utility model;

[0034] Figure 2 This is a cross-sectional view of the battery in the thickness direction provided in Embodiment 2 of this utility model;

[0035] Figure 3A cross-sectional view along the thickness direction of the battery provided in Embodiment 3 of this utility model;

[0036] Figure 4 This is a partial structural schematic diagram of the battery provided in Embodiment 3 of this utility model;

[0037] Figure 5 This is a cross-sectional view along the length of the battery provided in Embodiment 3 of this utility model;

[0038] Figure 6 This diagram illustrates the steps of connecting the cover plate assembly to the electrode tabs according to an embodiment of the present invention.

[0039] in:

[0040] 1. Cover plate body; 11. First through hole; 111. Stepped through hole;

[0041] 2. Welded component; 3. Pole post; 4. Insulating component; 41. Second limiting part;

[0042] 5. Electrode; 51. First Electrode; 52. Second Electrode;

[0043] 6. Battery cell; 7. Insulating sheet; 71. First limiting part. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] like Figures 1 to 6 As shown, this utility model embodiment provides a cover plate assembly that can solve the problem that during the cover plate production process, foreign objects such as welding slag and molten dust may fall into the battery and cause a short circuit.

[0047] First, the cover plate assembly includes a cover plate body 1 and an electrode assembly. The cover plate body 1 has a first through hole 11. The electrode assembly covers the first through hole 11 and is welded to the cover plate body 1 at their overlapping position. The electrode assembly includes a first end face for connecting to the tab 5 on the battery cell 6. The end face of the battery cell 6 with the tab 5 is a second end face. Along the thickness direction of the cover plate body 1, a receiving space is provided between the first end face and the second end face to accommodate the tab 5. It should be noted that the cover plate body 1 includes, but is not limited to, a plain aluminum sheet. Furthermore, the opening shape of the first through hole 11 is adapted to the shape of the projection of the electrode assembly along the thickness direction.

[0048] As can be seen, the cover plate assembly provided in this embodiment of the present invention has a receiving space between the first end face of the electrode post assembly and the second end face of the cell 6 for accommodating the tab 5. The presence of this receiving space facilitates the connection between the tab 5 and the electrode post 3, eliminating the need for an adapter plate and thus eliminating the need for adapter plate welding. This improves the space utilization of the cell 6, which is beneficial for increasing capacity and reducing component costs. Simultaneously, it helps reduce the internal resistance of the cell 6, enhances current carrying capacity, and reduces the path between the tab 5 and the electrode post 3, thereby enhancing heat conduction and heat dissipation. Furthermore, the electrode post assembly covers the through holes on the cover plate body 1. The electrode post assembly and the cover plate body 1 are welded at their overlapping position. This overlap necessarily creates a supporting relationship at the overlapping position, and the components are placed sequentially, with the later-placed component further away from the battery interior. This allows the welding operation at the overlapping position to be performed outside the battery, enabling visible welding and preventing weld slag, molten dust, etc., from falling into the battery interior, thus avoiding the risk of short circuits.

[0049] In specific implementation, the side of the cover plate body 1 closest to the battery cell 6 protrudes outward in the direction away from the battery cell 6 to form a convex structure. The first through hole 11 is opened in the convex structure, which includes a receiving space. Due to the formed convex structure, the receiving space between the first end face and the second end face is larger in the thickness direction of the cover plate, which facilitates the arrangement of the tabs 5. It should be noted that the protrusion size at the convex structure should be large enough to accommodate the tabs 5 and facilitate bending operations of the tabs 5; if the size is too large, it may affect the overall size of the battery.

[0050] In specific implementation, the terminal assembly includes a terminal 3 and a welded component 2. The end face of the terminal 3 closest to the tab 5 is the first end face. The welded component 2 (i.e., the welded component 2 is a ring-shaped structure) is sleeved on the outer circumferential side of the terminal 3, and the welded component 2 is welded to the cover plate body 1 at their overlapping position. There is a circumferential gap between the terminal 3 and the welded component 2. An insulating component 4 is provided in the gap to effectively prevent the welded component 2 from becoming charged, thereby improving the overall safety of the battery. Typically, a polymer material with good insulating properties is selected for injection molding to ensure electrical isolation between the welded ring and the terminal 3. It should be noted that the terminal 3 and the welded component 2 are combined using nano-injection molding technology. Nano-injection molding is an efficient and safe connection method that not only improves the reliability of the connection but also effectively prevents the welded component 2 from becoming charged. The insulating component 4 includes, but is not limited to, polymer materials with good insulating properties. Furthermore, the connection technology between the terminal 3 and the welded component 2 is not limited to nano-injection molding.

[0051] In specific implementation, the first through hole 11 is a stepped through hole 111, and the stepped through hole 111 has a first stepped surface; the welded part 2 has a contact surface that abuts against the first stepped surface along the thickness direction. Due to the existence of the stepped through hole 111 and the first stepped surface, the first stepped surface and the contact surface can abut against each other along the thickness direction of the cover plate body 1, thereby limiting their position in that thickness direction. At the same time, they can be limited in two dimensions on a plane perpendicular to the thickness direction, that is, the welded part 2 and the cover plate body 1 can be limited in three dimensions, which facilitates the fixing of their positions and the implementation of subsequent welding operations.

[0052] In a specific implementation, it also includes an insulating sheet 7, which is disposed on the surface of the cover plate body 1 near the battery cell 6. The insulating sheet 7 has a second through hole that communicates with the first through hole 11. It should be noted that the insulating sheet 7 includes, but is not limited to, insulating adhesive, and the second through hole is used to connect the pole post 3 and the tab 5 in the first through hole 11.

[0053] For specific implementation details, please refer to [link / reference]. Figure 6 The installation of the cover plate assembly includes the following steps:

[0054] Step 1: The welding ring is sleeved on the outside of the pole post 3. The insulating part 4 of the circumferential gap between the two is formed by nano-injection molding, which combines with the welding ring and the pole post 3 to form the pole post assembly.

[0055] Step 2: The cover plate body 1 and the insulating sheet 7 are joined together by ultrasonic heat fusion;

[0056] Step 3: After the pole post 3 and the tab 5 are electrically connected, the welded part 2 is then connected to the cover plate.

[0057] Based on the different shaping and retraction methods of the tab 5 and the different ways of fitting and installing the welded part 2 with the cover plate body 1, the exemplary embodiments one, two, and three are described as follows:

[0058] Exemplary Example 1

[0059] For specific implementation details, please refer to [link / reference]. Figure 1 The stepped through hole 111 includes a first hole section near the electrode 5 and a second hole section away from the electrode 5; along the radial section of the first through hole 11, the cross-sectional area of ​​the first hole section is smaller than the cross-sectional area of ​​the second hole section, that is, the hole diameter of the first hole section is smaller than the hole diameter of the second hole section; along the thickness direction, the contact surface of the welded part 2 overlaps on the first stepped surface of the cover plate body 1.

[0060] This utility model embodiment provides a battery, including the aforementioned cover plate assembly; two battery cells 6 are provided, one battery cell 6 having a first electrode tab 51 and the other battery cell 6 having a second electrode tab 52; the first electrode tab 51 and the second electrode tab 52 are merged at the position near the first electrode tab 51 extending out of the battery cell 6 to form an electrode tab 5, the electrode tab 5 includes a folding section, a bending section and a connecting section, the folding section is connected to the two battery cells 6 respectively, the connecting section is electrically connected to the first end face, and the bending section connects the folding section and the connecting section; the bending section is formed by bending the folding section toward the second electrode tab 52.

[0061] In practice, the installation steps for tab 5 and the cover plate assembly are as follows:

[0062] Step 1: After the electrode tab 5 is pre-welded along the edge, it extends through the first through hole 11 of the cover plate body 1 and the second through hole on the insulating component 4, and the electrode tab 5 is directly welded to the electrode post 3.

[0063] Step 2: The pole post assembly and the tab 5 are rotated 90° around the outer edge of the welded part 2, and the cover plate body 1 and the welded part 2 are installed in place. It should be noted that the rotation angle of the pole post assembly and the tab 5 around the outer edge of the welded part 2 is not limited to 90 degrees, but can also be 100°, 120°, etc. The specific value of the rotation angle can be designed by those skilled in the art according to actual needs.

[0064] Step 3: Laser welding is performed on the cover plate body 1 and the welded component 2. The welding method of the cover plate body 1 and the welded component 2 is not limited to laser welding. The specific welding method can be designed by those skilled in the art according to actual needs.

[0065] The above installation steps require only a certain angle (e.g., 90°) for the pole assembly 3 to mate with the cover plate body 1, making assembly convenient and saving time.

[0066] This utility model provides an electrical device, including the battery described above.

[0067] There are no particular limitations on the electrical devices used in this invention, which may include, but are not limited to: laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0068] Exemplary Example 2

[0069] like Figure 2 As shown, Embodiment 2 of this utility model provides a cover plate assembly, a battery, and an electrical device. The difference between Embodiment 2 and Embodiment 1 is that:

[0070] The utility model embodiment provides a battery including the aforementioned cover plate assembly; two battery cells 6 are provided, one battery cell 6 having a first tab 51 and the other battery cell 6 having a second tab 52; the first tab 51 and the second tab 52 are combined at the position close to the contact between the two battery cells 6 to form a tab 5, the tab 5 includes a folding section, a bending section and a connecting section, the folding section is connected to the two battery cells 6 respectively, the connecting section is electrically connected to the first end face, and the bending section connects the folding section and the connecting section; the bending section bends from the folding section toward the first tab 51, and the connecting section bends from the bending section toward the second tab 52.

[0071] In specific implementation, the coiling section and the bending section are provided with insulating components on the side of the coiling section near the pole post 3. It should be noted that the insulating components include, but are not limited to, PET tape (Polyethylene Terephthalate Adhesive).

[0072] In practice, the installation steps for tab 5 and the cover plate assembly are as follows:

[0073] Step 1: The first tab 51 and the second tab 52 are joined together near the contact point of the two cells 6 to form the tab 5. To prevent the tabs from being inserted upside down, PET tape can be applied to the first side of the joined and shaped position of the tab 5. Specifically, the first side can be the side near the first tab 51. The first part of the PET tape is applied to the gathering section, and the second part of the PET tape is applied to the bending section. After pre-welding, it extends through the first through hole 11 of the cover plate body 1 and the second through hole of the insulating part 4 and is directly welded to the pole post 3.

[0074] Step 2: Rotate the pole assembly and the tab 5 around the outer edge of the welded part 2 by 90°. It should be noted that the rotation angle of the pole assembly and the tab 5 around the outer edge of the welded part 2 is not limited to 90 degrees, but can also be 100°, 120°, etc. The specific value of the rotation angle can be designed by those skilled in the art according to actual needs.

[0075] Step 3: The tab 5 is pushed diagonally back to the edge of the cover plate body 1 and then pressed down. The PET tape has a shaping section, which is used to connect the first part and the second part. The first part is located in the gathering section, and the second part is located in the bending section. This shaping section can be a thinning area relative to the first part and the second part. Due to the presence of the shaping section, the tab 5 is easy to bend at the shaping point, and the tab 5 is finally formed as follows. Figure 2 As shown in the diagram, the S-shaped bend, cover plate body 1, and welded component 2 are installed in place.

[0076] Step 4: Laser welding is performed on the cover plate body 1 and the welded component 2. The welding method of the cover plate body 1 and the welded component 2 is not limited to laser welding. The specific welding method can be designed by those skilled in the art according to actual needs.

[0077] In Embodiment 2, the electrode assembly 3 only needs to be rotated by a certain angle (e.g., 90°) to mate with the cover plate body 1, making assembly convenient. Moreover, compared with Embodiment 1, the final shape of the electrode tab 5 in Embodiment 2 is S-shaped, which can better fold the electrode tab 5. Even if the electrode tab is long at this time, the electrode tab can still be effectively folded through the above design, without occupying too much space inside the battery casing, further improving the energy density.

[0078] Exemplary Example 3

[0079] like Figure 3 , Figure 4 , Figure 5 As shown, Embodiment 2 of this utility model provides a cover plate assembly, a battery, and an electrical device. The difference between Embodiment 3 and Embodiment 1 is that:

[0080] In specific implementation, the stepped through hole 111 includes a first hole section close to the tab 5 and a second hole section away from the tab 5; along the radial section of the first through hole 11, the cross-sectional area of ​​the first hole section is larger than the cross-sectional area of ​​the second hole section, that is, the diameter of the first hole section is larger than the diameter of the second hole section; along the thickness direction, the first stepped surface of the cover plate body 1 overlaps the contact surface of the welded part 2. In order to prevent the electrode assembly 3 from falling into the battery and causing poor welding during the welding process of the welded part 2 and the cover plate body 1 without support below, in specific implementation, the insulating sheet 7 has a first limiting part 71, and the insulating part 4 can have a second limiting part 41. By the first limiting part 71 and the second limiting part 41 being engaged, the electrode assembly 3 can be effectively prevented from falling into the battery and causing poor welding. It should be noted that the second limiting part 41 can be a buckle, and the second limiting part 41 is a blind hole or through hole for accommodating the buckle and being able to engage with the buckle, but it is not limited to this. The specific structural forms of the first limiting part 71 and the second limiting part 41 can be specifically designed by those skilled in the art according to actual needs.

[0081] The utility model embodiment provides a battery including the above-mentioned cover plate assembly; two battery cells 6 are provided, one battery cell 6 is provided with a first electrode tab 51, and the other battery cell 6 is provided with a second electrode tab 52; the first electrode tab 51 is bent in the direction away from the second electrode tab 52 and then electrically connected to the first end face, and the second electrode tab 52 is bent in the direction away from the first electrode tab 51 and then electrically connected to the first end face.

[0082] In practice, the installation steps for tab 5 and the cover plate assembly are as follows:

[0083] Step 1: After pre-soldering tab 5, JR (Jellyroll, bare cell) are placed on both sides of the terminal assembly and directly soldered to terminal 3.

[0084] Step 2: Rotate the core 90° around the outer edge of the solder mark to assemble the core. It should be noted that the rotation angle can also be 100°, 120°, etc. The specific value of the rotation angle can be designed by those skilled in the art according to actual needs.

[0085] Step 3: Install the cover plate body 1 and the insulating sheet 7 onto the pole assembly from top to bottom, and install the cover plate body 1 and the welded part 2 in place.

[0086] Step 4: Laser welding of the cover plate body 1 and the weldment 2. The welding method of the cover plate body 1 and the weldment 2 is not limited to laser welding. The specific welding method can be designed by those skilled in the art according to actual needs.

[0087] Compared with Examples 1 and 2, Example 3 requires the shortest length of electrode tab 5, requires the smallest space to accommodate electrode tab 5, and is less prone to inverted insertion.

[0088] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0089] The various embodiments in this specification 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.

[0090] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body (1) has a first through hole (11); The pole assembly covers the first through hole (11), and the pole assembly is welded to the cover plate body (1) at their overlapping position. The pole assembly includes a first end face for connecting to the tab (5) on the cell (6). The end face of the battery cell (6) where the tab (5) is located is the second end face; Along the thickness direction of the cover plate body (1), there is a receiving space between the first end face and the second end face for accommodating the electrode tab (5).

2. The cover plate assembly according to claim 1, characterized in that, The cover plate body (1) protrudes outward from the side near the battery cell (6) to form a convex hull structure in the direction away from the battery cell (6). The first through hole (11) is opened in the convex hull structure, and the convex hull structure includes the accommodating space.

3. The cover plate assembly according to claim 1, characterized in that, The pole assembly includes: The end face of the pole post (3) near the tab (5) is the first end face; Welding component (2), the welding component (2) is sleeved on the outer side of the pole post (3) and the welding component (2) is welded to the cover plate body (1) at their overlapping position; There is a circumferential gap between the pole post (3) and the welded part (2); an insulating part (4) is provided in the gap.

4. The cover plate assembly according to claim 3, characterized in that, The first through hole (11) is a stepped through hole (111), and the stepped through hole (111) has a first step surface; The welded part (2) has a contact surface that abuts against the first step surface along the thickness direction.

5. The cover plate assembly according to claim 4, characterized in that, The stepped through hole (111) includes a first hole section close to the tab (5) and a second hole section away from the tab (5); Along the radial section of the first through hole (11), the cross-sectional area of ​​the first hole segment is smaller than the cross-sectional area of ​​the second hole segment; Along the thickness direction, the contact surface of the welded part (2) overlaps the first step surface of the cover plate body (1).

6. The cover plate assembly according to claim 4, characterized in that, The stepped through hole (111) includes a first hole section close to the tab (5) and a second hole section away from the tab (5); Along the radial section of the first through hole (11), the cross-sectional area of ​​the first hole segment is greater than the cross-sectional area of ​​the second hole segment; Along the thickness direction, the first step surface of the cover plate body (1) overlaps the contact surface of the welded part (2).

7. The cover plate assembly according to claim 3, characterized in that, It also includes an insulating sheet (7), which is disposed on the surface of the cover plate body (1) near the battery cell (6), and the insulating sheet (7) is provided with a second through hole that communicates with the first through hole (11).

8. The cover plate assembly according to claim 7, characterized in that, The insulating sheet (7) has a first limiting part (71), and the insulating member (4) has a second limiting part (41), and the first limiting part (71) and the second limiting part (41) are engaged.

9. A battery, characterized in that, Includes the cover plate assembly according to any one of claims 1-8; two battery cells (6) are provided, one of which is provided with a first tab (51) and the other of which is provided with a second tab (52); in, The first electrode (51) and the second electrode (52) merge to form an electrode (5) near the position where the first electrode (51) extends out of the battery cell (6). The electrode (5) includes a folding section, a bending section and a connecting section. The folding section connects to the two batteries (6) respectively. The connecting section is electrically connected to the first end face. The bending section connects the folding section and the connecting section. The bending section is formed by bending the folding section toward the second electrode (52). Alternatively, the first tab (51) and the second tab (52) are joined together at a position close to the contact point of the two battery cells (6) to form a tab (5). The tab (5) includes a folding section, a bending section and a connecting section. The folding section is connected to the two battery cells (6) respectively. The connecting section is electrically connected to the first end face. The bending section connects the folding section and the connecting section. The bending section bends from the folding section toward the first tab (51), and the connecting section bends from the bending section toward the second tab (52). Alternatively, the first electrode (51) is bent away from the second electrode (52) and electrically connected to the first end face, and the second electrode (52) is bent away from the first electrode (51) and electrically connected to the first end face.

10. An electrical device, characterized in that, Includes the battery as described in claim 9.

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