Cover plate assembly and battery cell

Abstract

The utility model belongs to battery technical field discloses the cover plate subassembly and battery monomer, cover plate subassembly includes cover plate and insulating plate, insulating plate includes first insulating plate body and second insulating plate body, first insulating plate body sets up in the side of cover plate towards electric core, electric core includes electric core body and pole lug, and pole lug includes the gathering department, the bending part and the connecting portion that connect in proper order, the gathering department is connected with the side of electric core body towards cover plate, and the connecting portion is equipped with first connecting area, and first connecting area is connected with pole column, and second insulating plate body is located between first insulating plate body and electric core body, along first direction, second insulating plate body one side with first insulating plate body can overturn and connect, and the heat conduction part is equipped on second insulating plate body, and the heat conduction part contacts with first connecting area, to dissipate the heat of first connecting area.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Technology

[0002] A typical battery cell includes a cell, adapter plates, a battery casing, a cover plate, and an insulating plate. The cell and adapter plates are housed inside the battery casing, with the cover plate covering the opening in the casing. The insulating plate covers the side of the cover plate facing the cell. The tabs on the cell and the terminals on the cover plate are welded to the adapter plates to achieve a conductive connection between the tabs and terminals.

[0003] During the charging and discharging process of a battery cell, the heat is concentrated at the welding point between the tab and the adapter plate, which makes the insulating plate near the welding point prone to thermal melting and deformation, thereby reducing the structural stability of the battery cell.

[0004] Therefore, there is an urgent need to propose a cover plate assembly and a battery cell to solve the above-mentioned technical problems. Utility Model Content

[0005] The first objective of this invention is to provide a cover plate assembly in which the heat-conducting part can dissipate heat in the first connection area, thereby reducing the probability of thermal melting and deformation of the insulating plate near the first connection area.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Cover plate assembly, including a cover plate and an insulating plate, the insulating plate including:

[0008] The first insulating plate is disposed on the side of the cover plate facing the battery cell. The battery cell includes a battery cell body and a tab. The tab includes a gathering part, a bending part and a connecting part connected in sequence. The gathering part is connected to the side of the battery cell body facing the cover plate. The connecting part is provided with a first connecting area and the first connecting area is connected to the pole.

[0009] The second insulating plate is located between the first insulating plate and the battery cell body. Along the first direction, one side of the second insulating plate is rotatably connected to the first insulating plate. The second insulating plate is provided with a heat-conducting part, which is in contact with the first connection area.

[0010] Optionally, along a third direction, the orthographic projection of the heat-conducting part onto the connecting part covers the first connecting area, and the third direction is perpendicular to the first direction.

[0011] Optionally, the second insulating plate is provided with a heat-conducting structure for heat dissipation at the bend.

[0012] Optionally, the heat-conducting structure includes a first heat-conducting groove, which extends along a second direction and has one end penetrating the sidewall of the second insulating plate facing the bend. The first heat-conducting groove is disposed opposite to the bend.

[0013] Optionally, there may be multiple first heat conduction grooves, which are distributed at intervals along a first direction.

[0014] Optionally, the depth of the first heat conduction groove along the third direction is a, the dimension of the first heat conduction groove along the first direction is b, the third direction is perpendicular to the first direction, and the distance between two adjacent first heat conduction grooves is c, wherein a≤0.6mm, and / or, 2mm≤b≤6mm, and / or, c≤0.3mm.

[0015] Optionally, the heat-conducting structure is located on the side of the second insulating plate facing the connection part. Along the third direction, the orthographic projection of the heat-conducting structure on the connection part is the first orthographic projection. The first orthographic projection is disposed opposite to the first connection area in the second direction, and the third direction is perpendicular to the second direction.

[0016] At least one end of the first orthographic projection in the first direction extends beyond the first connecting region;

[0017] Alternatively, the two ends of the first orthographic projection in the first direction are respectively aligned with the two ends of the first connecting area in the first direction.

[0018] Optionally, the cover plate is provided with a first mounting hole, and the first insulating plate is provided with a second heat-conducting groove and a second mounting hole. The second heat-conducting groove is located on the side of the first insulating plate facing the battery cell body. One end of the second heat-conducting groove is connected to the second mounting hole, and the other end passes through the side wall of the first insulating plate. The electrode post passes through the first mounting hole and the second mounting hole.

[0019] Optionally, the electrode post includes a base plate located between the first insulating plate and the second insulating plate, with at least a portion of the base plate covering a portion of the second heat-conducting groove; and / or, the cover plate assembly further includes an adapter piece, with one end of the electrode group facing the cell body connected to the adapter piece, and at least a portion of the adapter piece covering a portion of the second heat-conducting groove.

[0020] The second objective of this invention is to provide a battery cell with high reliability and long cycle life.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] A battery cell includes a battery cell, terminals, a battery casing, and the aforementioned cover plate assembly. The battery cell and adapter are both disposed inside the battery casing. The cover plate covers the opening of the battery casing. The battery cell includes a battery cell body and a tab. The tab includes a gathering part, a bending part, and a connecting part connected in sequence. The gathering part is connected to the side of the battery cell body facing the cover plate. The connecting part has a first connecting area, which is connected to the terminal. A second insulating plate is located between the first insulating plate and the battery cell body. A heat-conducting part is in contact with the first connecting area.

[0023] The beneficial effects of this utility model are:

[0024] The second insulating plate is provided with a heat-conducting part, which is configured to contact the first connection area. When the battery cell is charged and discharged, the heat-conducting part can dissipate the heat of the first connection area, reduce the probability of heat concentration in the first connection area, and thus reduce the probability of thermal melting and deformation of the insulating plate near the first connection area. This improves the structural stability of the battery cell and is conducive to improving the reliability of the battery cell and extending the cycle life of the battery cell. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a single battery cell provided by this utility model;

[0026] Figure 2 This is an exploded structural diagram of a single battery cell provided by this utility model;

[0027] Figure 3 This is an exploded structural diagram of the cover plate assembly provided by this utility model;

[0028] Figure 4 This is a schematic diagram of the first assembly structure of the cover plate assembly and the battery cell provided by this utility model;

[0029] Figure 5 yes Figure 4 Enlarged view of section A in the image;

[0030] Figure 6 This is a schematic diagram of the second assembly structure of the cover plate assembly and the battery cell provided by this utility model;

[0031] Figure 7 yes Figure 6 Enlarged view of section B in the image;

[0032] Figure 8 This is an exploded structural diagram of the battery pack provided by this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of an electrical device provided by this utility model;

[0034] Figure 10 This is a schematic diagram of the structure of another electrical device provided by this utility model;

[0035] Figure 11 This is a schematic diagram of the structure of another type of electrical equipment provided by this utility model.

[0036] In the picture:

[0037] D1, First Direction; D2, Second Direction; D3, Third Direction;

[0038] 1. Battery pack; 1a. Case; 1b. Case cover; 1c. Individual battery cells;

[0039] 10. Cover plate assembly; 20. Battery cell; 21. Battery cell body; 22. Electrode tab; 22a. Gathering part; 22b. Bending part; 22c. Connecting part; 22d. First connecting area; 22e. First orthographic projection; 30. Adapter piece; 40. Battery casing; 50. Insulating film; 60. Base plate; 70. Film;

[0040] 100, Cover plate; 110, First mounting hole; 200, Insulating plate; 210, First insulating plate body; 211, Second heat-conducting groove; 212, Second mounting hole; 220, Second insulating plate body; 221, Heat-conducting structure; 222, Heat-conducting part; 223, First heat-conducting groove; 300, Pole post; 310, Base plate; 320, Column body; 400, Pressure block. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] This embodiment provides a cover plate assembly. The heat-conducting part of the cover plate assembly can dissipate heat in the first connection area, thereby reducing the probability of thermal melting and deformation of the insulating plate near the first connection area.

[0046] Specifically, such as Figures 1 to 6 As shown, the cover plate assembly 10 includes a cover plate 100 and an insulating plate 200. The insulating plate 200 includes a first insulating plate body 210 and a second insulating plate body 220. The first insulating plate body 210 is disposed on the side of the cover plate 100 facing the battery cell 20. The battery cell 20 includes a battery cell body 21 and a tab 22. The tab 22 includes a gathering portion 22a, a bending portion 22b, and a connecting portion 22c connected in sequence. The gathering portion 22a is connected to the side of the battery cell body 21 facing the cover plate 100. The connecting portion 22c is provided with a first connecting area 22d, which is connected to the electrode post 300. The second insulating plate body 220 is located between the first insulating plate body 210 and the battery cell body 21. Along the first direction D1, one side of the second insulating plate body 220 is rotatably connected to the first insulating plate body 210. The second insulating plate body 220 is provided with a heat-conducting portion 222, which is in contact with the first connecting area 22d.

[0047] When the battery cell 1c is charged and discharged, the heat-conducting part 222 can dissipate the heat of the first connection area 22d, reduce the probability of heat concentrating in the first connection area 22d, and thus reduce the probability of the insulating plate 200 near the first connection area 22d being deformed by heat melting, thereby improving the structural stability of the battery cell 1c. In addition, this structure also reduces the risk of thermal runaway caused by heat accumulation in the first connection area 22d. It can be seen that the cover plate assembly 10 has the effect of improving the reliability of the battery cell 1c and extending the cycle life of the battery cell 1c.

[0048] It should be noted that the first connection area 22d can be directly connected to the terminal post 300, or it can be indirectly connected to the terminal post 300 through the adapter piece 30. In this embodiment, the first connection area 22d is connected to the terminal post 300 through the adapter piece 30. That is, one side of the adapter piece 30 is connected to the first connection area 22d, and the other side is connected to the end of the terminal post 300 facing the cell body 21. The cell 20 is electrically connected to the terminal post 300 through the adapter piece 30. In this embodiment, the adapter piece 30 and the first connection area 22d are connected by an ultrasonic welding process.

[0049] Furthermore, along the third direction D3, the orthographic projection of the heat-conducting part 222 onto the connecting part 22c covers the first connecting area 22d, and the third direction D3 is perpendicular to the first direction D1. This structure can increase the contact area between the heat-conducting part 222 and the first connecting area 22d, thereby improving the effect of the heat-conducting part 222 in dissipating heat from the first connecting area 22d.

[0050] Optionally, the heat-conducting part 222 is a thermally conductive silicone layer or a graphene oxide composite material layer. Both thermally conductive silicone and graphene oxide composite materials have good thermal conductivity and insulation properties. Setting the thermally conductive silicone layer or graphene oxide composite material layer as the heat-conducting part 222 on the second insulating plate 220 is beneficial to improving the heat dissipation efficiency of the first connection area 22d.

[0051] Optionally, both ends of the heat-conducting part 222 are bent toward the bending part 22b along the first direction D1, and are flush with the side wall of the second insulating plate 220 toward the bending part 22b, so that the heat-conducting part 222 can quickly conduct heat to areas outside the insulating plate 200, reducing the probability of the insulating plate 200 near the heat-conducting part 222 undergoing thermal melting deformation.

[0052] Optionally, the cover plate 100 is provided with a first mounting hole 110, and the first insulating plate 210 is provided with a second heat-conducting groove 211 and a second mounting hole 212. The second heat-conducting groove 211 is located on the side of the first insulating plate 210 facing the cell body 21, that is, the second heat-conducting groove 211 is located on the side of the first insulating plate 210 away from the cover plate 100. One end of the second heat-conducting groove 211 communicates with the second mounting hole 212, and the other end penetrates through the side wall of the first insulating plate 210. The electrode post 300 passes through the first mounting hole 110 and the second mounting hole 212 and is used to connect with the adapter piece 30. In actual production, the electrode post 300 and the adapter piece 30 need to be laser welded. For ease of description, the area where the electrode post 300 and the adapter piece 30 are welded is referred to as the second connection area. The large amount of heat generated during the welding process can easily cause the insulating plate 200 near the second connection area to undergo thermal melting deformation. To address this technical problem, the technical solution provided in this embodiment includes a second heat-conducting groove 211 that communicates with the second mounting hole 212 on the first insulating plate 210. The end of the second heat-conducting groove 211 that is away from the second mounting hole 212 passes through the side wall of the first insulating plate 210. Therefore, when laser welding is performed on the pole post 300 and the adapter piece 30, the second heat-conducting groove 211 can dissipate at least part of the welding heat, reducing the probability of the insulating plate 200 near the second connection area undergoing thermal melting deformation.

[0053] Furthermore, at least a portion of the adapter plate 30 covers the second heat-conducting groove 211 to reduce the distance between the second heat-conducting groove 211 and the second connection area, thereby improving the effect of the second heat-conducting groove 211 in dissipating welding heat.

[0054] Furthermore, the pole post 300 includes a base plate 310 located between the first insulating plate 210 and the second insulating plate 220. At least a portion of the base plate 310 covers the second heat conduction groove 211 to reduce the distance between the second heat conduction groove 211 and the second connection area, thereby improving the effect of the second heat conduction groove 211 in dissipating welding heat.

[0055] In other embodiments, at least a portion of the adapter plate 30 covers the second heat-conducting groove 211, or at least a portion of the base plate 310 covers the second heat-conducting groove 211.

[0056] Furthermore, the pole post 300 also includes a post body 320, one end of which is connected to the base plate 310, and the other end passes through the first mounting hole 110 and the second mounting hole 212, and is connected to the pressure block 400 on the cover plate 100.

[0057] Optionally, the second insulating plate 220 is provided with a heat-conducting structure 221 for dissipating heat from the bent portion 22b. During the charging and discharging process of the battery cell 1c, the temperature of the bent portion 22b is significantly higher than that of the convergence portion 22a and the connecting portion 22c. Therefore, by providing a heat-conducting structure 221 on the second insulating plate 220 to dissipate heat from the bent portion 22b, the heat dissipation efficiency of the bent portion 22b is improved, and the temperature of the bent portion 22b is reduced. This not only improves the performance of the battery cell 1c but also further reduces the risk of thermal runaway of the battery cell 1c.

[0058] Furthermore, such as Figures 5 to 7 As shown, the heat-conducting structure 221 includes a first heat-conducting groove 223. The first heat-conducting groove 223 extends along the second direction D2 and one end penetrates the side wall of the second insulating plate 220 facing the bent portion 22b. The first heat-conducting groove 223 is arranged opposite to the bent portion 22b so that the first heat-conducting groove 223 can dissipate the heat of the bent portion 22b and achieve the heat dissipation effect of the bent portion 22b.

[0059] In another embodiment, the thermally conductive structure 221 includes an insulating thermally conductive sheet, which may be a thermally conductive silicone sheet or a graphene oxide composite material sheet. The insulating thermally conductive sheet is embedded in the second insulating plate 220. One end of the insulating thermally conductive sheet is connected to or opposite to the bent portion 22b and spaced apart. The other end of the insulating thermally conductive sheet is flush with the side wall of the second insulating plate 220 along the first direction D1. The insulating thermally conductive sheet absorbs the heat from the bent portion 22b (when the insulating thermally conductive sheet is connected to the bent portion 22b, the insulating thermally conductive sheet directly absorbs the heat from the bent portion 22b; when the insulating thermally conductive sheet is spaced apart from the bent portion 22b, the air between the bent portion 22b and the insulating thermally conductive sheet transfers the heat from the bent portion 22b to the insulating thermally conductive sheet) and transfers the heat to the outside of the second insulating plate 220 to achieve heat dissipation from the bent portion 22b.

[0060] Furthermore, the number of first heat conduction grooves 223 is multiple. For example, the number of first heat conduction grooves 223 can be ten, fifteen or twenty, etc. Multiple first heat conduction grooves 223 are distributed at intervals along the first direction D1 to increase the number of first heat conduction grooves 223, so as to improve the heat dissipation effect on the bent portion 22b.

[0061] Furthermore, the depth of the first heat-conducting groove 223 along the third direction D3 is a, where a ≤ 0.6 mm. For example, a can be 0.6 mm, 0.5 mm, or 0.4 mm, etc., to ensure that the second insulating plate 220 has reliable structural strength and thickness in the area where the heat-conducting structure 221 is set, thereby ensuring that the second insulating plate 220 has reliable structural strength and insulation.

[0062] Furthermore, the first heat-conducting groove 223 has a dimension of b along the first direction D1, and the third direction D3 is perpendicular to the first direction D1, with 2mm ≤ b ≤ 6mm. For example, b can be 2mm, 3mm, 3.5mm, 4mm, 5mm, or 6mm, etc. On the one hand, this ensures that the second insulating plate 220 has reliable structural strength and thickness in the area where the heat-conducting structure 221 is set, thereby ensuring that the second insulating plate 220 has reliable structural strength and insulation. On the other hand, it ensures that the first heat-conducting groove 223 has a sufficiently large heat-conducting channel, ensuring that the second heat-conducting groove 211 has a high heat dissipation effect on the bent portion 22b.

[0063] Furthermore, the distance between two adjacent first heat conduction grooves 223 is c, where c ≤ 0.3 mm. For example, c can be 0.3 mm, 0.2 mm, or 0.15 mm, etc., so that the two adjacent first heat conduction grooves 223 can transfer heat to each other, thereby achieving the effect of rapid heat dissipation of the bent portion 22b.

[0064] In another implementation scheme, the numerical ranges of a, b, and c mentioned above can be chosen to satisfy one or two of them, depending on the actual production and usage needs.

[0065] In this embodiment, multiple first heat conduction grooves 223 are evenly distributed along the first direction D1 to improve the heat dissipation effect on the bent portion 22b, and on the other hand, to ensure that the second insulating plate 220 has reliable structural strength.

[0066] In this embodiment, the first direction D1, the second direction D2, and the third direction D3 are mutually perpendicular, and the first direction D1 is the length direction of the cover plate 100, the second direction D2 is the width direction of the cover plate 100, and the third direction D3 is the thickness direction of the cover plate 100. Of course, in other embodiments, the first direction D1, the second direction D2, and the third direction D3 can also be other directions with mutually perpendicular relationships, which will not be listed here.

[0067] Optionally, the heat-conducting structure 221 is located on the side of the second insulating plate 220 facing the connecting portion 22c. Along the third direction D3, the orthographic projection of the heat-conducting structure 221 onto the connecting portion 22c is a first orthographic projection 22e. The first orthographic projection 22e is positioned opposite to the first connecting region 22d in the second direction D2, and both ends of the first orthographic projection 22e extend beyond the first connecting region 22d in the first direction D1. Therefore, the heat-conducting structure 221 can not only dissipate heat from the bending portion 22b, but also dissipate heat from the first connecting region 22d, improving the heat dissipation effect on the first connecting region 22d. It also improves the space utilization of the battery cell 1c, which is beneficial for increasing the volumetric energy density of the battery cell 1c. Furthermore, the fact that both ends of the first orthographic projection 22e extend beyond the first connecting region 22d in the first direction D1 further enhances the heat dissipation effect of the heat-conducting structure 221 on the first connecting region 22d.

[0068] Furthermore, the first orthographic projection 22e has a dimension of d in the first direction D1, and the first connecting region 22d has a dimension of e in the first direction D1, with de ≥ 1.5 mm. For example, de can be 1.5 mm, 2 mm, or 2.3 mm, etc., to ensure that the two ends of the first orthographic projection 22e in the first direction D1 exceed the first connecting region 22d by a sufficient size, thereby providing a strong guarantee for the efficient heat dissipation of the first connecting region 22d by the heat-conducting structure 221.

[0069] In another embodiment, one end of the first orthographic projection 22e extends beyond the first connection region 22d in the first direction D1.

[0070] In another embodiment, the two ends of the first orthographic projection 22e in the first direction D1 are respectively aligned with the two ends of the first connecting region 22d in the first direction D1.

[0071] The cover plate assembly 10 provided in this embodiment, including the heat-conducting part 222, the heat-conducting structure 221, and the second heat-conducting groove 211, can all be set on the existing structure of the cover plate assembly 10 without significantly changing the existing production process of the cover plate assembly 10, which reduces the production difficulty and production cost of the cover plate assembly 10 to a certain extent.

[0072] This embodiment also provides a battery cell 1c, such as Figures 1 to 6As shown, the battery cell 1c includes a cell 20, a terminal post 300, a battery casing 40, and the aforementioned cover plate assembly 10. The cell 20 and the adapter plate 30 are both disposed inside the battery casing 40. The cover plate 100 covers the opening of the battery casing 40. The cell 20 includes a cell body 21 and a tab 22. The tab 22 includes a gathering portion 22a, a bending portion 22b, and a connecting portion 22c connected in sequence. The gathering portion 22a is connected to the side of the cell body 21 facing the cover plate 100. The connecting portion 22c has a first connecting area 22d, which is connected to the terminal post 300. The second insulating plate 220 is located between the first insulating plate 210 and the cell body 21. The heat-conducting portion 222 is in contact with the first connecting area 22d. The battery cell 1c uses the aforementioned cover plate assembly 10. When the battery cell 1c is charged and discharged, the heat-conducting part 222 can dissipate the heat of the first connection area 22d, reduce the probability of heat concentrating in the first connection area 22d, thereby reducing the probability of the insulating plate 200 near the first connection area 22d being deformed by heat melting, improving the structural stability of the battery cell 1c, thereby improving the reliability of the battery cell 1c, and also extending the cycle life of the battery cell 1c.

[0073] Optionally, the battery cell 1c further includes an insulating film 50, a bottom support plate 60, and a protective film 70. The insulating film 50 wraps around the outer periphery of the cell body 21 to achieve insulation between the cell body 21 and the battery casing 40. The bottom support plate 60 is located at the bottom of the battery casing 40, and the cell body 21 is located inside the battery casing 40 and placed on the bottom support plate 60. The bottom support plate 60 serves to support the cell 20. The protective film 70 is attached to the outer periphery of the battery casing 40 to protect the battery casing 40.

[0074] This embodiment also provides a battery pack 1, such as Figure 8 As shown, the battery pack 1 includes a battery box and multiple battery cells 1c. For example, the number of battery cells 1c can be five, ten, or twelve. The battery box includes a box body 1a and a box cover 1b, which are fastened together to form a receiving cavity. The multiple battery cells 1c are all disposed in the receiving cavity. The battery pack 1 uses the aforementioned battery cells 1c, which have high reliability and long service life.

[0075] This embodiment also provides an electrical device, in which the aforementioned battery pack 1 or battery cell 1c is disposed. This electrical device can be a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Figure 9 A car using the aforementioned battery pack 1 is shown. Figure 10 A truck using the aforementioned battery pack 1 is shown. Figure 11 A motorhome using the aforementioned battery pack 1 is shown; other electrical devices using the aforementioned battery pack 1 or battery cell 1c are not listed here.

[0076] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate assembly, characterized in that, Includes a cover plate (100) and an insulating plate (200), the insulating plate (200) comprising: A first insulating plate (210) is disposed on the side of the cover plate (100) facing the battery cell (20). The battery cell (20) includes a battery cell body (21) and a tab (22). The tab (22) includes a gathering part (22a), a bending part (22b), and a connecting part (22c) connected in sequence. The gathering part (22a) is connected to the side of the battery cell body (21) facing the cover plate (100). The connecting part (22c) is provided with a first connecting area (22d), and the first connecting area (22d) is connected to the pole (300). The second insulating plate (220) is located between the first insulating plate (210) and the battery cell body (21) along the first direction (D1). One side of the second insulating plate (220) is rotatably connected to the first insulating plate (210). The second insulating plate (220) is provided with a heat-conducting part (222), which is in contact with the first connection area (22d).

2. The cover plate assembly according to claim 1, characterized in that, Along the third direction (D3), the orthographic projection of the heat-conducting part (222) onto the connecting part (22c) covers the first connecting area (22d), and the third direction (D3) is perpendicular to the first direction (D1).

3. The cover plate assembly according to claim 1 or 2, characterized in that, The second insulating plate (220) is provided with a heat-conducting structure (221) for dissipating heat from the bent portion (22b).

4. The cover plate assembly according to claim 3, characterized in that, The heat-conducting structure (221) includes a first heat-conducting groove (223), which extends along a second direction (D2) and one end penetrates the sidewall of the second insulating plate (220) facing the bent portion (22b). The first heat-conducting groove (223) is disposed opposite to the bent portion (22b).

5. The cover plate assembly according to claim 4, characterized in that, The number of the first heat conduction grooves (223) is multiple, and the multiple first heat conduction grooves (223) are distributed at intervals along the first direction (D1).

6. The cover plate assembly according to claim 5, characterized in that, The depth of the first heat-conducting groove (223) along the third direction (D3) is a, the dimension of the first heat-conducting groove (223) along the first direction (D1) is b, the third direction (D3) is perpendicular to the first direction (D1), and the distance between two adjacent first heat-conducting grooves (223) is c, wherein a≤0.6mm, and / or, 2mm≤b≤6mm, and / or, c≤0.3mm.

7. The cover plate assembly according to claim 3, characterized in that, The heat-conducting structure (221) is located on the side of the second insulating plate (220) facing the connecting part (22c) along the third direction (D3). The orthographic projection of the heat-conducting structure (221) on the connecting part (22c) is the first orthographic projection (22e). The first orthographic projection (22e) is opposite to the first connecting area (22d) in the second direction (D2). The third direction (D3) is perpendicular to the second direction (D2). At least one end of the first orthographic projection (22e) in the first direction (D1) extends beyond the first connecting region (22d); Alternatively, the two ends of the first orthographic projection (22e) in the first direction (D1) are respectively aligned with the two ends of the first connecting area (22d) in the first direction (D1).

8. The cover plate assembly according to claim 1 or 2, characterized in that, The cover plate (100) is provided with a first mounting hole (110), and the first insulating plate (210) is provided with a second heat-conducting groove (211) and a second mounting hole (212). The second heat-conducting groove (211) is located on the side of the first insulating plate (210) facing the battery cell body (21). One end of the second heat-conducting groove (211) is connected to the second mounting hole (212), and the other end passes through the side wall of the first insulating plate (210). The pole post (300) passes through the first mounting hole (110) and the second mounting hole (212).

9. The cover plate assembly according to claim 8, characterized in that, The pole post (300) includes a base plate (310) located between the first insulating plate (210) and the second insulating plate (220), at least a portion of the base plate (310) covering the second heat-conducting groove (211); and / or, the cover plate assembly (10) further includes an adapter plate (30), one end of the pole post (300) facing the cell body (21) is connected to the adapter plate (30), at least a portion of the adapter plate (30) covering the second heat-conducting groove (211).

10. A single battery cell, characterized in that, The battery includes a battery cell (20), a terminal post (300), a battery casing (40), and a cover plate assembly (10) as described in any one of claims 1-9. The battery cell (20) and the adapter plate (30) are both disposed inside the battery casing (40). The cover plate (100) covers the opening of the battery casing (40). The battery cell (20) includes a cell body (21) and a tab (22). The tab (22) includes a gathering portion (22a) and a bending portion (22b) connected in sequence. The battery cell body (21) is connected to the side of the battery cell body (21) facing the cover plate (100). The connecting part (22c) is provided with a first connecting area (22d), which is connected to the pole post (300). The second insulating plate (220) is located between the first insulating plate (210) and the battery cell body (21). The heat-conducting part (222) is in contact with the first connecting area (22d).

Images