Cover plate structure, battery cell and battery module

Abstract

The present invention relates to the technical field of energy storage devices, and in particular, to a cover plate structure, an electric core, and a battery module. The cover plate structure includes a pole column. The bottom plate of the pole column includes a fuse safety zone and a welding zone. The tab is welded to the welding zone. The main body of the pole column is communicated with the welding zone through the fuse safety zone. The fuse safety zone can be melted and disconnected during thermal runaway to disconnect the main body from the welding zone. The electric core includes an electric core housing and the above-mentioned cover plate structure. The cover plate structure is arranged at the opening of the electric core housing, and the cover plate structure and the electric core housing jointly form an electric core outer shell. The battery module includes a module outer shell and the above-mentioned electric core, and the electric core is arranged inside the module outer shell. The cover plate structure, the electric core, and the battery module can reduce the internal resistance of the electric core, reduce the number of accessories, simplify the assembly steps, and improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to a cover plate structure, a battery core and a battery module. Background Art

[0002] The cover of the battery cell is usually equipped with a pole, which is connected to the pole lug of the pole group through a connecting piece. In order to ensure the safety of the battery cell, block the electrical conduction in the event of thermal runaway, delay or even eliminate the risk of thermal runaway, a fuse structure is usually set on the positive pole connecting piece. The fuse structure melts and disconnects in the event of thermal runaway, thus disconnecting the pole group from the pole. However, the connection piece will increase the internal resistance of the battery cell and increase the number of parts. The assembly process requires multiple positioning, which is not conducive to automated production. Summary of the invention

[0003] An object of the present invention is to provide a cover plate structure that can reduce the internal resistance of a battery cell and improve production efficiency.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A cover plate structure is provided, comprising a pole, wherein the bottom plate of the pole comprises a fuse safety zone and a welding zone, the pole lug is welded to the welding zone, the main body of the pole is connected to the welding zone via the fuse safety zone, and the fuse safety zone can be melted and disconnected in the event of thermal runaway, so that the main body is disconnected from the welding zone.

[0006] Optionally, the fuse safety zone is provided with through holes and / or grooves to reduce the flow cross-section of the fuse safety zone.

[0007] Optionally, an insulating protective layer is further included, and the insulating protective layer is coated on the fuse safety zone.

[0008] Optionally, the cover plate structure further includes a heat sink, which is connected to an area of ​​the welding zone where the pole lug is not welded, and is used to absorb and dissipate the heat of the welding zone.

[0009] Optionally, the heat sink comprises a connection area, the connection area is connected to the end surface of the welding area facing the pole ear, and the end surface of the connection area facing away from the welding area has a heat dissipation protrusion.

[0010] Optionally, the cover plate structure further includes a first plastic part, and the heat sink further includes a heat dissipation area, one end of the heat dissipation area is connected to the connection area, and the other end of the heat dissipation area is bent toward the first plastic part and contacts the first plastic part.

[0011] Optionally, one end of the heat dissipation area connected to the connection area is bent, so that the area where the heat dissipation area is spaced apart from the first plastic part is closer to the first plastic part than the connection area.

[0012] Optionally, the heat dissipation member is in a plate-like structure with a thickness of T. The plate-like structure has a first plate surface and a second plate surface arranged opposite to each other. The first plate surface faces the first plastic part, and the second plate surface faces away from the first plastic part. The area of the part of the second plate surface located in the heat dissipation area is S1, the area of the part of the second plate surface located in the connection area is S3, the surface of the welding area facing the tab is the third plate surface, and the area of the part of the third plate surface welded to the tab is S2, satisfying , and / or , and / or .

[0013] Another object of the present invention is to provide an electric core that can reduce the internal resistance of the electric core and improve production efficiency.

[0014] To achieve this purpose, the present invention adopts the following technical solutions:

[0015] Provide an electric core, including an electric core housing and the above-mentioned cover plate structure. The cover plate structure is arranged at the opening of the electric core housing, and the cover plate structure and the electric core housing jointly form an electric core outer shell.

[0016] Another object of the present invention is to provide a battery module that can reduce the internal resistance of the electric core and improve production efficiency.

[0017] To achieve this purpose, the present invention adopts the following technical solutions:

[0018] Provide a battery module, including a module outer shell and the above-mentioned electric core. The electric core is arranged inside the module outer shell.

[0019] The beneficial effects of the present invention:

[0020] The present invention provides a cover plate structure, including a pole column. The bottom plate of the pole column includes a fuse safety area and a welding area. The tab is welded to the welding area. The main body of the pole column is communicated with the welding area through the fuse safety area. The fuse safety area can be melted and disconnected during thermal runaway to disconnect the main body from the welding area. By directly arranging the fuse safety area and the welding area on the bottom plate of the pole column, the connecting piece can be omitted on the premise of ensuring safe disconnection during thermal runaway. This can not only reduce the internal resistance of the electric core, but also reduce the number of accessories, simplify the assembly steps, and improve production efficiency.

[0021] The present invention also provides an electric core, including an electric core housing and the above-mentioned cover plate structure. The cover plate structure is arranged at the opening of the electric core housing, and the cover plate structure and the electric core housing jointly form an electric core outer shell. This electric core can reduce the internal resistance of the electric core, reduce the number of accessories, simplify the assembly steps, and improve production efficiency.

[0022] The present invention also provides a battery module, including a module housing and the above-mentioned battery cells, and the battery cells are arranged inside the module housing. This battery module can reduce the internal resistance of the battery cells, reduce the number of components, simplify the assembly steps, and improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the cover plate structure provided by an embodiment of the present invention from a first perspective;

[0024] Figure 2 is an exploded view of the cover plate structure provided by an embodiment of the present invention from a first perspective;

[0025] Figure 3 is a schematic structural diagram of the cover plate structure provided by an embodiment of the present invention from a second perspective;

[0026] Figure 4 is an exploded view of the cover plate structure provided by an embodiment of the present invention from a second perspective;

[0027] Figure 5 is a schematic structural diagram of the terminal post provided by an embodiment of the present invention;

[0028] Figure 6 is a schematic structural diagram of the heat dissipation member provided by an embodiment of the present invention from a third perspective;

[0029] Figure 7 is a schematic structural diagram of the heat dissipation member provided by an embodiment of the present invention from a fourth perspective;

[0030] Figure 8 is a schematic structural diagram of the cover plate structure provided by an embodiment of the present invention from a fifth perspective;

[0031] Figure 9 is Figure 8 the A-A cross-sectional view in

[0032] Figure 10 is an exploded view of the battery cell (with the positive electrode and the negative electrode on the same side) provided by an embodiment of the present invention;

[0033] Figure 11 is an exploded view of the battery cell (with the positive electrode and the negative electrode on different sides) provided by an embodiment of the present invention.

[0034] In the figure:

[0035] 1. Terminal post; 11. Bottom plate; 111. Fuse safety area; 1111. First groove; 1112. First through hole; 112. Welding area; 1121. Third plate surface; 12. Main body;

[0036] 2. Insulation protection layer; 3. Heat dissipation component; 31. Connection area; 311. Heat dissipation protrusion; 32. Heat dissipation area; 321. First bending area; 322. Spacing area; 323. Second bending area; 324. Support end; 301. First plate surface; 302. Second plate surface;

[0037] 4. First plastic part; 41. Avoidance groove; 42. Limiting protrusion;

[0038] 5. Riveting block; 6. Upper plastic; 7. Sealing ring; 8. Top cover;

[0039] 100. Cover structure; 200. Battery cell housing; 300. Electrode group; 3001. Tab; 400. Protection sticker. Specific implementation manner

[0040] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present invention are shown in the drawings, rather than all of them.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the first feature is at a lower horizontal height than the second feature.

[0043] Generally, a pole post is provided on the cover plate of the battery cell, and the pole post is connected and conducted with the tab of the electrode group through a connecting piece. To ensure the safety of the battery cell during use, a fusing structure is generally provided on the connecting piece of the positive electrode to block the electrical conduction during thermal runaway, delay or even eliminate the risk of thermal runaway. The fusing structure melts and disconnects during thermal runaway, thus disconnecting the connection between the electrode group and the pole post. However, setting up the connecting piece will increase the internal resistance of the battery cell and the number of components, and multiple positioning is required during the assembly process, which is not conducive to automated production. To solve the above problems, this embodiment provides a cover plate structure that can reduce the internal resistance of the battery cell and improve production efficiency.

[0044] As Figures 1 to 9 shown, the cover plate structure 100 of this embodiment includes a pole post 1. The bottom plate 11 of the pole post 1 includes a fusing safety zone 111 and a welding zone 112. The tab 3001 is welded to the welding zone 112. The main body 12 of the pole post 1 is connected through the fusing safety zone 111 and the welding zone 112. The fusing safety zone 111 can melt and disconnect during thermal runaway, so that the main body 12 is disconnected from the welding zone 112. By directly providing the fusing safety zone 111 and the welding zone 112 on the bottom plate 11 of the pole post 1, the connecting piece can be omitted on the premise of ensuring safe disconnection during thermal runaway, which can not only reduce the internal resistance of the battery cell, but also reduce the number of accessories, simplify the assembly steps, and improve production efficiency.

[0045] Optionally, the fusing safety zone 111 is provided with a through hole. As Figure 5 shown, the fusing safety zone 111 is provided with a first through hole 1112, and the first through hole 1112 is penetrated, and the penetration direction is perpendicular to the plane of the bottom plate 11. Since the flow direction of electricity in the bottom plate 11 is parallel to the plane direction of the bottom plate 11, the penetration direction of the first through hole 1112 is perpendicular to the flow direction of electricity. Opening the first through hole 1112 can reduce the flow cross-section. Of course, in other embodiments, multiple through holes can also be opened. The multiple through holes can be arranged at intervals, and the penetration directions are parallel. In addition, the through holes can be set to have a circular, elliptical, polygonal or irregular cross-section, which is not limited herein.

[0046] Optionally, the fusing safety zone 111 is provided with a groove. As Figure 5 shown, the fusing safety zone 111 is provided with a first groove 1111 to further reduce the flow cross-section of the fusing safety zone 111. Optionally, the first groove 1111 is opened on the surface of the bottom plate 11 facing the first plastic part 4, and the first groove 1111 is penetrated, and the penetration direction is perpendicular to the flow direction of electricity.

[0047] Optionally, the cover structure 100 further includes an insulating protective layer 2, which is coated at the fuse safety area 111. The insulating protective layer 2 is used to prevent short circuits and arcing, provide safety protection for the fuse safety area 111, and can also increase the structural strength here. The first groove 1111 facilitates positioning when the insulating protective layer 2 is provided.

[0048] As Figure 4 shown, optionally, an avoidance groove 41 is provided on the side of the first plastic part 4 facing the inside of the battery. The insulating protective layer 2 protrudes from the bottom plate 11, and the protruding part is located at the avoidance groove 41 to prevent the protruding part of the insulating protective layer 2 from abutting against the first plastic part 4, resulting in a gap between the bottom plate 11 and the first plastic part 4. Optionally, a limiting protrusion 42 is further provided on the side of the first plastic part 4 facing the inside of the battery. The limiting protrusion 42 is located at the edge of the bottom plate 11 to prevent the bottom plate 11 from moving along the plate surface of the first plastic part 4.

[0049] Optionally, the bottom plate 11 of the pole column 1 is attached to the surface of the first plastic part 4 facing the inside of the battery. When the welding area 112 of the bottom plate 11 is welded to the pole ear 3001, heat will be transferred from the bottom plate 11 to the first plastic part 4, resulting in varying degrees of melting and burning of the first plastic part 4. Therefore, it is necessary to dissipate heat from the pole column 1, and try to ensure the heat dissipation efficiency within a limited space, dissipate the heat generated by welding, and protect the first plastic part 4. Therefore, optionally, the cover structure 100 further includes a heat dissipation part 3, and the heat dissipation part 3 is connected to the area of the welding area 112 where the pole ear 3001 is not welded. The heat dissipation part 3 is used to absorb the heat of the welding area 112 and dissipate it.

[0050] Optionally, the heat dissipation part 3 includes a connection area 31. The connection area 31 is connected to the end face of the welding area 112 facing the pole ear 3001 so that heat can reach the heat dissipation part 3 faster. The end face of the connection area 31 facing away from the welding area 112 has heat dissipation protrusions 311 to increase the heat dissipation area of the connection area 31 and improve the heat dissipation efficiency.

[0051] Optionally, the cover structure 100 further includes a first plastic part 4. The heat dissipation part 3 further includes a heat dissipation area 32. One end of the heat dissipation area 32 is connected to the connection area 31, and the other end bends towards the first plastic part 4 and contacts the first plastic part 4. The setting of the heat dissipation area 32 can further increase the heat dissipation area of the heat dissipation part 3, thereby improving the heat dissipation efficiency. The end of the heat dissipation area 32 contacts the first plastic part 4, which is convenient for fixing the heat dissipation part 3 so that the first plastic part 4 can support the heat dissipation part 3.

[0052] Optionally, the end of the heat dissipation area 32 connected to the connection area 31 has a bend, so that the area where the heat dissipation area 32 is spaced from the first plastic part 4 is closer to the first plastic part 4 than the connection area 31. Such a setting can reduce the gap space between the heat dissipation area 32 of the heat dissipation part 3 and the first plastic part 4, reduce the space occupied by heat dissipation, and ensure the energy density of the battery cell.

[0053] Optionally, the heat dissipation member 3 has a bent plate-like structure, and the connection area 31 and the heat dissipation area 32 are arranged in sequence along the length direction of the first plastic part 4, so that the sizes of the connection area 31 and the heat dissipation area 32 of the heat dissipation member 3 can be set to be larger, ensuring that the heat dissipation area is sufficient.

[0054] As Figure 6 and Figure 7 shown, the heat dissipation area 32 includes a first bent area 321, a spacing area 322, a second bent area 323, and a support end 324 that are connected in sequence along the length direction of the first plastic part 4. The spacing area 322 is the area that is arranged in parallel and spaced from the first plastic part 4. The first bent area 321 is located at the connection position between the spacing area 322 and the connection area 31. The second bent area 323 is located between the spacing area 322 and the support end 324. The end face of the support end 324 contacts the first plastic part 4 to prevent the heat dissipation member 3 from being deformed or displaced by force. The suspended design of the spacing area 322 is beneficial to heat dissipation and will not burn the first plastic part 4.

[0055] Optionally, the heat dissipation member 3 is a plate-like structure, and the thickness of the plate-like structure is T, satisfying . When the heat dissipation member 3 is too thin, the heat dissipation area is too small, and the structural strength of the heat dissipation member 3 cannot be guaranteed. For example, if the spacing area 322 is bent and deformed, it may abut against the first plastic part 4, thereby burning the first plastic part 4. When the heat dissipation member 3 is too thick, the bending difficulty will increase, and more space will be occupied, which is not conducive to the arrangement of each component inside the battery cell.

[0056] Optionally, the plate-like structure has a first plate surface 301 and a second plate surface 302 that are oppositely arranged. The first plate surface 301 faces the first plastic part 4, and the second plate surface 302 faces away from the first plastic part 4. The area of the part of the second plate surface 302 located in the heat dissipation area 32 is S1, that is, Figure 6 the area of the shaded area on the left in . The surface of the welding area 112 facing the tab 3001 is the third plate surface 1121, and the area of the part of the third plate surface 1121 welded to the tab 3001 is S2, satisfying

[0057] Optionally, the area of the part of the second plate surface 302 located in the connection area 31 is S3, that is, Figure 6 the area of the shaded area on the right in . That is, the proportion of the connection area 31 in the heat dissipation member 3 cannot be too small, otherwise the heat conduction area between the heat dissipation member 3 and the bottom plate 11 is insufficient, and the slow heat transfer will also cause more heat to be transferred to the first plastic part 4.

[0058] As shown in Table 1 below, ten cover plate structures 100 with different size specifications are provided. These ten cover plate structures 100 all adopt the pole column 1 and the heat dissipation component 3 designed above. Among them, the thickness T of the heat dissipation component 3 is 0.5 mm, and the number of layers of the tab 3001 is 90 layers. S4 in the table is the cross-sectional area of the fuse safety zone 111, and the welding power is the welding power when the tab 3001 is welded to the pole column 1.

[0059] Table 1

[0060]

[0061] For the ratios of S1 / S2 of Example 1, Example 2, and Example 3 in the above table, the values are all less than 70%. Among them, after the tab 3001 is welded to the pole column 1, the first plastic part 4 of the cover plate structure 100 in Example 1 has obvious burns and melting, and this cover plate structure 100 does not meet the use requirements of the battery cell. The first plastic part 4 of the cover plate structure 100 in Example 2 has slight burns, and the proportion of this cover plate structure 100 that can meet the use requirements of the battery cell is 80%. The first plastic part 4 of the cover plate structure 100 in Example 3 has slight burns, and the proportion of this cover plate structure 100 that can meet the use requirements of the battery cell is 90%. For the ratios of S1 / S2 of Example 4 to Example 10, the values are all greater than or equal to 70%. After the welding of the tab 3001 to the pole column 1 is completed for these cover plate structures 100, no burns are seen on their first plastic parts 4, and the proportion of the cover plate structures 100 that can meet the use requirements of the battery cell is 100%.

[0062] As shown in Table 2 below, ten cover plate structures 100 with different size specifications are provided. These ten cover plate structures 100 all adopt the pole column 1 and the heat dissipation component 3 designed above. Among them, the thickness T of the heat dissipation component 3 is 1 mm, and the number of layers of the tab 3001 is 90 layers. Similarly, S4 in the table is the cross-sectional area of the fuse safety zone 111, and the welding power is the welding power when the tab 3001 is welded to the pole column 1.

[0063] Table 2

[0064]

[0065] The values of the ratio of S3 / S1 in Example 1, Example 2, Example 3, Example 4 and Example 5 in the above table are all less than 40%. After the tab 3001 of these cover structures 100 is welded to the terminal 1, the first plastic part 4 of the cover structure 100 in Example 1 has obvious burns and melting, and this cover structure 100 does not meet the usage requirements of the battery cell. The first plastic part 4 of the cover structure 100 in Example 2 has burns, and the proportion of this cover structure 100 that can meet the usage requirements of the battery cell is 70%. The first plastic parts 4 of the cover structures 100 in Example 3 to Example 5 all have slight burns, and the proportions of these cover structures 100 that can meet the usage requirements of the battery cell are 83%, 92% and 99% in sequence. The values of the ratio of S3 / S1 in Example 6 to Example 10 are all greater than or equal to 40%. After the tab 3001 of these cover structures 100 is welded to the terminal 1, no burns are found on their first plastic parts 4, and the proportion of the cover structure 100 that can meet the usage requirements of the battery cell is 100%.

[0066] Therefore, in order to prevent the laser welding between the tab 3001 and the terminal 1 from causing burns and melting of the first plastic part 4, etc., it is necessary to ensure that the thickness T of the heat dissipation part 3 satisfies . At the same time, it is also necessary to satisfy , , so as to ensure that there is no burn on the first plastic part 4, thereby ensuring the qualified rate of the product.

[0067] Optionally, in this embodiment, the heat dissipation part 3 is only provided at the positive electrode, and the heat dissipation part 3 is not provided at the negative electrode. Of course, in other embodiments, the heat dissipation part 3 can also be only provided at the negative electrode, or the heat dissipation part 3 can be provided at both the positive electrode and the negative electrode.

[0068] In this embodiment, the terminal 1 of the negative electrode is made of copper material, which has a higher thermal conductivity, and the terminal 1 of the negative electrode does not need to be provided with a fuse safety zone 111. Therefore, on the premise that the other dimensions of the terminal 1 of the negative electrode are the same as those at the positive electrode, there will be no burns, melting and other defects on the first plastic part 4 at the negative electrode. Therefore, in this embodiment, the heat dissipation part 3 is only provided at the positive electrode.

[0069] Optionally, in this embodiment, the cover structure 100 may only include the components of the positive electrode, that is, the positive electrode and the negative electrode are arranged at both ends of the battery cell, or the cover structure 100 may simultaneously include the components of the positive electrode and the negative electrode, that is, the positive electrode and the negative electrode are arranged at the same end of the battery cell.

[0070] Optionally, this cover structure 100 further includes a riveting block 5, an upper plastic 6, a sealing ring 7 and a top cover 8. Among them, the main body 12 of the terminal 1 is riveted and fixed to the riveting block 5 through the through hole on the top cover 8, the upper plastic 6 is clamped between the riveting block 5 and the top cover 8, and the sealing ring 7 is sleeved on the main body 12 of the terminal 1.

[0071] The cover structure 100 of this embodiment adopts the design of integrating the fuse structure on the bottom plate 11 of the terminal post 1, eliminating parts such as connecting pieces. Moreover, the tab 3001 is connected to the bottom plate 11 of the terminal post 1 by direct soldering, which can shorten the length of the tab 3001, reduce the process difficulty, and at the same time improve the space utilization rate inside the battery cell. The cover structure 100 also adds a heat dissipation part 3, which can achieve good heat dissipation while ensuring the fuse structure, further improving the safety of the battery cell. And through reasonable size design, the cover structure 100 can effectively prevent the first plastic part 4 from being burned or melted due to the thermal influence of the laser welding between the tab 3001 and the terminal post 1, ensuring the yield rate of the battery cell.

[0072] As Figures 10 to 11 shown, this embodiment also provides a battery cell, which includes a battery cell housing 200 and the above-mentioned cover structure 100. The cover structure 100 is arranged at the opening of the battery cell housing 200, and the cover structure 100 and the battery cell housing 200 together form a battery cell outer shell.

[0073] Optionally, the battery cell further includes a pole group 300 and a protective sticker 400. The pole group 300 is arranged inside the battery cell outer shell, and the protective sticker 400 is pasted on the outside of the top cover 8 of the cover structure 100.

[0074] Optionally, the battery cell of this embodiment can be Figure 10 the battery cell with the positive and negative electrodes on the same side as shown, or the battery cell with the positive and negative electrodes on different sides as shown in Figure 11 .

[0075] This battery cell can reduce the internal resistance of the battery cell, reduce the number of accessories, simplify the assembly steps, and improve the production efficiency.

[0076] This embodiment also provides a battery module, which includes a module outer shell and the above-mentioned battery cell. The battery cell is arranged inside the module outer shell. Optionally, multiple battery cells are arranged in series or in parallel, or in series first and then in parallel, or in parallel first and then in series, which is not limited here.

[0077] This battery module can reduce the internal resistance of the battery cell, reduce the number of accessories, simplify the assembly steps, and improve the production efficiency.

[0078] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Cover structure, characterized in that, include: A pole (1), wherein the bottom plate (11) of the pole (1) comprises a fuse safety zone (111) and a welding zone (112), the pole lug (301) is welded to the welding zone (112), the main body (12) of the pole (1) is connected to the welding zone (112) via the fuse safety zone (111), and the fuse safety zone (111) can be melted and disconnected in the event of thermal runaway, so that the main body (12) is disconnected from the welding zone (112); The cover plate structure (100) further comprises a first plastic part (4), and the bottom plate (11) is attached to a surface of the first plastic part (4) facing the interior of the battery; A heat sink (3), the heat sink (3) being connected to an area of ​​the welding area (112) to which the pole lug (301) is not welded, the heat sink (3) being used to absorb and dissipate heat from the welding area (112), the heat sink (3) comprising a connection area (31), the connection area (31) being connected to an end surface of the welding area (112) facing the pole lug (301), and an end surface of the connection area (31) facing away from the welding area (112) having a heat dissipation protrusion (311).

2. The cover plate structure according to claim 1, wherein, The fuse safety zone (111) is provided with a through hole and / or a groove to reduce the flow cross section of the fuse safety zone (111).

3. The cover plate structure according to claim 1, wherein It also comprises an insulating protective layer (2), wherein the insulating protective layer (2) covers the fuse safety area (111).

4. The cover plate structure according to claim 1, characterized in that, The heat sink (3) further comprises a heat sink area (32), one end of the heat sink area (32) being connected to the connection area (31), and the other end of the heat sink area (32) being bent toward the first plastic part (4) and in contact with the first plastic part (4).

5. The cover plate structure according to claim 4, characterized in that, One end of the heat dissipation area (32) connected to the connection area (31) is bent, so that the area where the heat dissipation area (32) and the first plastic part (4) are spaced apart is closer to the first plastic part (4) than the connection area (31).

6. The cover plate structure according to claim 4, wherein, The heat sink (3) is in a plate-like structure, the thickness of the plate-like structure is T, the plate-like structure has a first plate surface (301) and a second plate surface (302) arranged oppositely, the first plate surface (301) faces the first plastic part (4), the second plate surface (302) faces away from the first plastic part (4), the area of the part of the second plate surface (302) located in the heat dissipation area (32) is S1, the area of the part of the second plate surface (302) located in the connection area (31) is S3, the surface of the welding area (112) facing the tab (301) is the third plate surface (1121), and the area of the part of the third plate surface (1121) welded to the tab (301) is S2, satisfying , and / or , and / or .

7. The battery cell is characterized in that, It comprises a battery cell shell (200) and a cover plate structure according to any one of claims 1 to 6, wherein the cover plate structure (100) is arranged at an opening of the battery cell shell (200), and the cover plate structure (100) and the battery cell shell (200) together form a battery cell outer shell.

8. Battery module, characterized in that, It comprises a module housing and the battery cell as claimed in claim 7, wherein the battery cell is arranged in the module housing.

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