A top cover structure and a battery

Abstract

The application discloses a top cover structure and a battery. The top cover structure comprises a top cover sheet, an explosion-proof valve and a plastic part. The top cover sheet is provided with an explosion-proof hole. The explosion-proof valve is connected with the top cover sheet and covers the explosion-proof hole. The plastic part is provided with a first exhaust port penetrating through the plastic part. The projection of the first exhaust port on the axis direction of the explosion-proof hole is located on the outside of the explosion-proof valve. Compared with the prior art, the first exhaust port of the application is offset from the explosion-proof valve. The droplets of the electrolyte fall on the top cover sheet under the action of gravity and cannot contact the surface of the explosion-proof valve. By changing the position of the first exhaust port on the plastic part, a physical isolation barrier is formed on the basis of maintaining the original exhaust function. The direct contact between the electrolyte and the explosion-proof valve is effectively blocked, the oxidation corrosion of the explosion-proof valve is prevented, and the normal opening function of the explosion-proof valve in thermal runaway is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a top cover structure and a battery. Background Technology

[0002] In existing battery top cover structures, there is typically a top cover sheet, an explosion-proof valve, and a lower plastic assembly. The vent in the lower plastic component is positioned directly opposite the explosion-proof valve to meet the battery's internal gas emission requirements. As the last line of defense in the event of battery thermal runaway, the surface integrity and responsiveness of the explosion-proof valve are crucial.

[0003] However, this traditional layout has a significant drawback: when a small amount of electrolyte leaks from the core pack due to special operating conditions (such as inverted installation or tilted transportation), the electrolyte will drip directly onto the surface of the explosion-proof valve directly below through the lower plastic vent hole. Long-term contact will cause oxidation and corrosion of the metal film of the explosion-proof valve, thereby causing safety problems of the explosion-proof valve. Utility Model Content

[0004] In view of the shortcomings of the prior art, this application provides a top cover structure and battery that can prevent electrolyte from dripping into the explosion-proof valve.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A top cover structure includes a top cover plate, an explosion-proof valve, and a plastic component. The top cover plate has an explosion-proof hole. The explosion-proof valve is connected to the top cover plate and seals the explosion-proof hole. The plastic component has a through first vent, and the projection of the first vent in the axial direction of the explosion-proof hole is located outside the explosion-proof valve.

[0007] In one embodiment, the top cover structure includes a retainer for abutting against the core package. The retainer is disposed on the side of the plastic part away from the top cover sheet. The retainer has a through second vent, which communicates with the first vent.

[0008] In one embodiment, the plastic part is formed with a first receiving groove, which is disposed opposite to the second vent.

[0009] In one embodiment, when projected in a direction perpendicular to the axis of the explosion-proof hole, the distance between the first receiving groove and the first exhaust port is greater than the distance between the first receiving groove and the second exhaust port.

[0010] In one embodiment, the plastic part includes a first plate, a second plate, and a third plate connected sequentially along its height direction. The second plate is connected to the first plate and the third plate respectively. The first plate has a first receiving groove, and the third plate has a first vent.

[0011] In one embodiment, the plastic part includes a fourth plate and a fifth plate connected sequentially along its height direction, the fourth plate being connected to the third plate, and the fifth plate abutting against the top cover sheet.

[0012] In one embodiment, the depth of the first receiving groove is H1 in mm, and the height of the plastic part is H2 in mm, wherein 0.1 ≤ H1 ≤ 0.8 H2.

[0013] In one embodiment, the projection of the first receiving groove covers the second exhaust port in the axial direction of the explosion-proof hole.

[0014] In one embodiment, the top cover plate is formed with a second receiving groove, which is disposed opposite to the first exhaust port.

[0015] In one embodiment, the top cover includes a baffle and a cover body, the baffle and the cover body are connected, the baffle is disposed between the second receiving groove and the explosion-proof valve, along the axial direction of the explosion-proof hole, and the distance between the baffle and the plastic part is less than the distance between the second receiving groove and the plastic part.

[0016] In one embodiment, along the height direction of the plastic part, the distance between the first vent and the cover body is H3, in mm, and the maximum distance between the baffle and the cover body is H4, in mm, wherein 0.2≤H4≤0.8H3.

[0017] In one embodiment, the depth of the second receiving groove is H5 in mm, and the thickness of the cover body is H6 in mm, wherein 0.05H6≤H5≤0.5H6.

[0018] In one embodiment, along the axial direction of the explosion-proof hole, the distance between the first exhaust port and the top cover plate is H3, in mm, and the height of the plastic part is H2, in mm, wherein H3≤0.5H2.

[0019] In one embodiment, the distance between the second exhaust port and the bottom of the first receiving groove is H7, in mm, where H7≤5.

[0020] In one embodiment, the retainer includes a main body and a protrusion. The protrusion is connected to the side of the main body near the plastic part and protrudes from the main body. The main body has a second vent. The protrusion is located outside the groove wall of the first receiving groove. The protrusion and the plastic part are spaced apart.

[0021] This application also adopts the following technical solution, providing a battery including a core pack, a housing, and a top cover structure of any one of the above, wherein the top cover structure is connected to the housing, and the core pack is disposed inside the housing.

[0022] The beneficial effects of this application are as follows: This application provides a top cover structure and a battery. The top cover structure includes a top cover sheet, an explosion-proof valve, and a plastic component. The top cover sheet has an explosion-proof hole, the explosion-proof valve is connected to the top cover sheet and seals the explosion-proof hole, and the plastic component has a through-hole first vent. The projection of the first vent on the axial direction of the explosion-proof hole is located outside the explosion-proof valve. Compared with the prior art, the first vent in this application is offset from the explosion-proof valve. Electrolyte droplets fall onto the top cover sheet under gravity and cannot contact the surface of the explosion-proof valve. By changing the position of the first vent on the plastic component, a physical isolation barrier is formed while maintaining the original venting function. This effectively prevents direct contact between the electrolyte and the explosion-proof valve, prevents oxidation and corrosion of the explosion-proof valve, and ensures the normal opening function of the explosion-proof valve in the event of thermal runaway. The battery using this top cover structure maintains the unobstructed gas emission channel, ensures timely release of internal battery pressure, and prevents electrolyte corrosion of the explosion-proof valve, achieving dual optimization of safety protection without changing the main structure. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of a battery according to this application is shown;

[0024] Figure 2 An exploded schematic diagram of the components of a battery according to this application is shown;

[0025] Figure 3 A cross-sectional schematic diagram of a battery according to this application is shown;

[0026] Figure 4 It shows Figure 3 Enlarged view of point A in the image;

[0027] Figure 5 A top view schematic diagram of a top cover structure of this application is shown;

[0028] Reference numerals: 100, Top cover structure; 1, Top cover plate; 11, Second receiving groove; 12, Baffle; 13, Explosion-proof hole; 14, Cover plate body; 2, Explosion-proof valve; 3, Retainer; 31, Second exhaust port; 32, Main body; 33, Protrusion; 4, Plastic part; 41, First exhaust port; 42, First receiving groove; 43, First plate; 44, Second plate; 45, Third plate; 46, Fourth plate; 47, Fifth plate;

[0029] 200, shell; 300, core package. Detailed Implementation

[0030] In this application, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] See Figure 1 and Figure 2 This application provides a battery including a top cover structure 100, a core pack 300, and a housing 200. One end of the housing 200 is open, the core pack 300 is disposed inside the housing 200, and the top cover structure 100 is placed over the open end of the housing 200 to close the core pack 300, thus completing the assembly of the entire battery.

[0034] See Figure 3 and Figure 4The top cover structure 100 includes a top cover plate 1, an explosion-proof valve 2, and a plastic part 4. The top cover plate 1 has an explosion-proof hole 13. The explosion-proof valve 2 is connected to the top cover plate 1 and covers the explosion-proof hole 13. The plastic part 4 has a through first exhaust port 41. The projection of the first exhaust port 41 on the axial direction of the explosion-proof hole 13 is located outside the explosion-proof valve 2.

[0035] To describe clearly, Figure 4 The X direction indicates the axial direction of the explosion-proof hole 13.

[0036] In practical applications, the explosion-proof valve 2 refers to the pressure-sensitive element covering the explosion-proof hole 13. Specifically, it can be a laser-welded metal film structure that ruptures under abnormal pressure to release gas. During normal use, the core pack 300 will generate a small amount of gas. At this time, the first exhaust port 41 is mainly used for venting, expelling the gas inside the core pack 300. When a safety hazard occurs in the core pack 300, causing it to heat up and generate a large amount of gas, this large amount of gas enters the cavity formed by the top cover plate 1 and the plastic part 4 through the first exhaust port 41, and is finally discharged from the explosion-proof valve 2, releasing the gas inside the battery and preventing an explosion.

[0037] In some embodiments, the battery is installed in an inverted position. In this case, a small portion of the electrolyte inside the core pack 300 flows towards the top cover structure 100 under gravity, and eventually flows out along the first vent 41. Because the projected position of the first vent 41 is offset from the explosion-proof valve 2, the electrolyte droplets fall onto the top cover plate 1 under gravity and cannot contact the surface of the explosion-proof valve 2. This setting, by changing the position of the first vent 41 on the plastic part 4, forms a physical isolation barrier while maintaining the original venting function. It effectively prevents direct contact between the electrolyte and the explosion-proof valve 2, prevents oxidation and corrosion of the explosion-proof valve 2, and ensures the normal opening function of the explosion-proof valve 2 in the event of thermal runaway. At the same time, it maintains the unobstructed gas emission channel, ensuring timely release of internal battery pressure, achieving dual optimization of safety protection without changing the structure.

[0038] See again Figure 4 The top cover structure 100 includes a retainer 3, which is used to abut against the core package 300. The retainer 3 is located on the side of the plastic part 4 away from the top cover sheet 1. The retainer 3 has a through second vent 31, which is connected to the first vent 41.

[0039] In practical applications, when the battery is used upside down, a retainer 3 is provided to avoid supporting the core pack 300. The retainer 3 is located on the side of the plastic part 4 near the core pack 300, and abuts against the core pack 300. On the one hand, it supports the core pack 300 while isolating the core pack 300 and the plastic part 4; on the other hand, it provides a certain degree of sealing, causing most of the electrolyte to accumulate on both sides of the core pack 300, allowing only a small portion of electrolyte to leak out from the second vent 31. When electrolyte leaks from the core pack 300, the retainer 3, by abutting against the core pack 300, prevents the liquid from directly entering the second vent 31, forcing the liquid to flow along the surface of the retainer 3 and through the second vent 31 before flowing out from the first vent 41, effectively reducing the amount of electrolyte leaking out. Gas can be discharged through the communication channel between the second vent 31 and the first vent 41, ensuring that the explosion-proof function is not affected.

[0040] See again Figure 4 The plastic part 4 has a first receiving groove 42, which is disposed opposite to the second vent 31.

[0041] In practical applications, the first receiving groove 42 refers to a recessed structure on the surface of the plastic part 4, whose opening direction is aligned with the second vent 31, used to collect liquid or solid foreign matter discharged from the second vent 31. When electrolyte or solid foreign matter leaking from the core package 300 is discharged through the second vent 31, the first receiving groove 42, as a directional collection structure, can collect and store the electrolyte, blocking its continued downward flow. By adding the first receiving groove 42, the electrolyte is trapped in a specific area during flow, preventing the electrolyte from flowing towards the top cover plate 1.

[0042] The relative arrangement means that the axis of the first receiving tank 42 and the axis of the second exhaust port 31 are in the same vertical plane. Specifically, this can be achieved by adjusting the assembly angle of the plastic part 4, so that the liquid discharged from the second exhaust port 31 can directly enter the interior of the first receiving tank 42.

[0043] See again Figure 4 On the projection plane perpendicular to the axis of the explosion-proof hole 13, the distance between the first receiving groove 42 and the first exhaust port 41 is greater than the distance between the first receiving groove 42 and the second exhaust port 31.

[0044] In practical applications, when the electrolyte inside the core package 300 leaks from the second vent 31, the vertical distance between the first receiving tank 42 and the second vent 31 should not be too high to prevent splashing of the electrolyte when it drips. This effectively prevents electrolyte splashing and avoids contamination of the top cover structure 100. Therefore, setting the vertical distance between the first receiving tank 42 and the second vent 31 to be smaller than the vertical distance between the first receiving tank 42 and the first vent 41 helps prevent electrolyte splashing.

[0045] It should be noted that the vertical distance between the first receiving groove 42 and the first exhaust port 41 refers to the shortest distance on the projection plane from the bottom of the first receiving groove 42 to the edge of the first exhaust port 41, and the vertical distance between the first receiving groove 42 and the second exhaust port 31 refers to the shortest distance on the projection plane from the bottom of the first receiving groove 42 to the edge of the second exhaust port 31.

[0046] See again Figure 4 The plastic part 4 includes a first plate 43, a second plate 44 and a third plate 45 connected sequentially along its height direction. The second plate 44 is connected to the first plate 43 and the third plate 45 respectively. The first plate 43 has a first receiving groove 42 and the third plate 45 has a first vent 41.

[0047] In practical applications, the first plate 43 can be a plate-like structure located at the top of the plastic part 4 in the height direction, specifically it can be integrally molded using injection molding, with its surface recessed to form a first receiving groove 42 for receiving electrolyte. The second plate 44 can be an intermediate transition structure connecting the first plate 43 and the third plate 45, specifically it can be a vertical or inclined plate-like structure, used to support the staggered arrangement between the first plate 43 and the third plate 45. The third plate 45 can be a plate-like structure located lower than the first plate 43 in the height direction of the plastic part 4, with a through first vent 41 for guiding gas out. The first receiving groove 42 is used to temporarily store leaked electrolyte.

[0048] Specifically, the first plate 43 receives the electrolyte leaking from the core package 300 through the first receiving tank 42, preventing the liquid from flowing directly downwards. The third plate 45 maintains the gas discharge path through the first vent 41, and the second plate 44 serves as an intermediate connecting structure, creating a spatial misalignment between the first receiving tank 42 and the first vent 41 in the height direction. When the electrolyte enters the first receiving tank 42, the liquid remains within it. The gas is discharged through the first vent 41 along a path deviating from the axis of the explosion-proof valve 2, achieving gas-liquid path separation. The first receiving tank 42 can be positioned opposite the explosion-proof valve 2 along its axial direction.

[0049] It should be noted that the first plate 43, the second plate 44, and the third plate 45 can be divided along the height of the plastic part 4. The first plate 43 is located above the second plate 44, and the third plate 45 is located below the second plate 44. In this case, the first plate 43 forms a first receiving groove 42. In other embodiments, the first plate 43 and the second plate 44 can be distinguished as horizontal and vertical plates, respectively. The first plate 43 is a plate-like structure in the horizontal direction, and the second plate 44 is a plate-like structure in the vertical direction. In this case, the second plate 44 extends towards the second exhaust port 31 beyond the first plate 43. Then, the first receiving groove 42 is a groove structure formed by the first plate 43 and the second plate 44. The first plate 43 is the bottom of the first receiving groove 42, and the part of the second plate 44 that extends beyond the first plate 43 forms the groove wall of the first receiving groove 42.

[0050] See again Figure 4 The plastic part 4 includes a fourth plate 46 and a fifth plate 47 connected sequentially along its height direction. The fourth plate 46 is connected to the third plate 45, and the fifth plate 47 abuts against the top cover plate 1.

[0051] In practical applications, the fourth plate 46 can be a transition structure located between the third plate 45 and the fifth plate 47, and the fifth plate 47 can be a planar structure that contacts the plastic part 4 and the top cover plate 1, forming a supporting plane between the plastic part 4 and the top cover plate 1. With this configuration, the plastic part 4 forms multiple stepped structures along the height direction, which reduces the height of electrolyte dripping and improves the connection stability between the plastic part 4 and the top cover plate 1.

[0052] See again Figure 4 The depth of the first receiving groove 42 is H1, in mm, and the height of the plastic part 4 is H2, in mm, where 0.1≤H1≤0.8H2.

[0053] In practical applications, the depth of the first receiving tank 42 refers to the vertical distance from the bottom of the tank to the surface of the opening. This depth directly affects the temporary storage capacity of the electrolyte. The height of the plastic part 4 refers to its overall dimension along the axis of the explosion-proof hole 13. By controlling the depth of the first receiving tank 42 and the height of the plastic part 4 within a specific ratio range, in electrolyte leakage scenarios, the first receiving tank 42 can effectively intercept the liquid flowing through the second vent 31, preventing it from flowing directly to the explosion-proof valve 2. The lower limit of this ratio ensures that the first receiving tank 42 has a basic liquid storage capacity, while the upper limit prevents the main structural strength of the plastic part 4 from decreasing due to excessive tank depth, and also prevents the electrolyte from dripping too high, causing splashing. For example, H1 can be 0.1mm, 0.2H2, 0.3H2, 0.4H2, etc.

[0054] The value of H2 can range from 2mm to 10mm. If H2 is too high, it will affect the overall size of the battery, increase the battery volume, and make assembly difficult. If H2 is too low, it will affect the structural strength of the plastic part 4 and make it difficult to cut grooves. For example, H2 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0055] See Figure 5 , Figure 5 The rectangle shown by the dashed line can represent the projected area of ​​the first receiving groove 42, and the ellipse shown by the dashed line can represent the projected area of ​​the second exhaust port 31. In the axial direction of the explosion-proof hole 13, the projection of the first receiving groove 42 covers the second exhaust port 31.

[0056] In practical applications, the first receiving tank 42 should completely contain the second vent 31, so that the electrolyte or foreign matter flowing out of the second vent 31 can be completely blocked by the first receiving tank 42, preventing the electrolyte from leaking out of the first receiving tank 42.

[0057] See again Figure 4 The top cover plate 1 has a second receiving groove 11, which is disposed opposite to the first exhaust port 41.

[0058] In practical applications, the second receiving groove 11 refers to a recessed structure located on the surface of the top cover plate 1 and corresponding to the space of the first vent 41, used to receive the electrolyte overflowing from the first vent 41. The second receiving groove 11 is provided on the side of the top cover plate 1 facing the plastic part 4, forming a vertically corresponding spatial arrangement with the first vent 41 of the plastic part 4. When electrolyte overflows from the first vent 41, due to the receiving function of the second receiving groove 11, the liquid is guided into the second receiving groove 11 for storage, preventing it from flowing directly onto the surface of the explosion-proof valve 2. The dual storage function of the first receiving groove 42 and the second receiving groove 11 effectively prevents the electrolyte from flowing into the explosion-proof valve 2 or other areas of the top cover plate 1, avoiding corrosion of the explosion-proof valve 2 or other areas of the top cover plate 1. Here, "other areas of the top cover plate 1" can be understood as areas on the top cover plate 1 other than the second receiving groove 11, such as the electrode area.

[0059] See again Figure 4 The top cover 1 includes a baffle 12 and a cover body 14. The baffle 12 and the cover body 14 are connected. The baffle 12 is located between the second receiving groove 11 and the explosion-proof valve 2. Along the axial direction of the explosion-proof hole 13, the distance between the baffle 12 and the plastic part 4 is less than the distance between the second receiving groove 11 and the plastic part 4.

[0060] In practical applications, the baffle 12 is positioned between the second receiving tank 11 and the explosion-proof valve 2, and extends towards the plastic part 4. That is, along the axial direction of the explosion-proof hole 13, the baffle 12 is closer to the plastic part 4. Therefore, the baffle 12 is higher than the tank wall of the second receiving tank 11. With this arrangement, even if the electrolyte stored in the second receiving tank 11 overflows, the electrolyte will be blocked on the other side of the baffle 12 due to the blocking effect of the baffle 12, and will not flow to the explosion-proof valve 2, further protecting the explosion-proof valve 2 from corrosion.

[0061] More specifically, the fifth plate 47 and the top cover plate 1 abut against each other on the side of the second receiving tank 11 away from the explosion-proof valve 2. This contact between the fifth plate 47 and the top cover plate 1 acts as a barrier, preventing electrolyte overflowing from the second receiving tank 11 from flowing to other areas on the top cover plate 1 (such as the electrode post area), thus preventing corrosion of the electrode post. The fifth plate 47 and the baffle 12 are located on opposite sides of the second receiving tank 11. Even if electrolyte overflows from the second receiving tank 11, the overflowing electrolyte is confined between the fifth plate 47 and the baffle 12, preventing electrolyte from flowing towards the explosion-proof valve 2 and the electrode post, effectively protecting the battery's critical components.

[0062] See again Figure 4 Along the height direction of the plastic part 4, the distance between the first exhaust port 41 and the cover body 14 is H3, in mm, and the maximum distance between the baffle 12 and the cover body 14 is H4, in mm, where 0.2≤H4≤0.8H3.

[0063] In practical applications, the maximum distance between the baffle 12 and the cover body 14 refers to the height of the baffle 12. The height of the baffle 12 is an important parameter for effectively blocking the flow of electrolyte to the explosion-proof valve 2. However, if the height of the baffle 12 is too high, it may interfere with the plastic part 4. If the height is too low, it cannot effectively block the electrolyte. Therefore, the height of the baffle 12 is limited to between 0.2mm and 0.8H3. For example, H4 can be 0.2mm, 0.1H3, 0.2H3, 0.3H3, 0.4H3, etc.

[0064] Wherein, H3≤0.5H2, this setting is to limit the height between the first vent 41 and the cover body 14, to prevent electrolyte from splashing and contaminating the cover body 14 when it drips from the first vent 41 into the second receiving tank 11. H3 can be values ​​such as 0.5H2, 0.4H2, 0.3H2, 0.1H2, etc.

[0065] See again Figure 4 The depth of the second receiving groove 11 is H5, in mm, and the thickness of the cover body 14 is H6, in mm, wherein 0.05H6≤H5≤0.5H6.

[0066] In practical applications, if the depth of the second receiving tank 11 is too deep, it will affect the strength of the top cover plate 1 itself; if the depth of the second receiving tank 11 is too shallow, it will affect the storage of electrolyte. Therefore, the depth of the second receiving tank 11 is limited to between 0.05H6 and 0.5H6, which ensures that the second receiving tank 11 has a basic storage capacity while avoiding the impact of excessive depth on the structural strength of the top cover plate 1. Among them, H5 can be values ​​such as 0.05H6, 0.06H6, 0.07H6, 0.08H6, 0.09H6, 0.1H6, and 0.2H6.

[0067] See again Figure 4 The distance between the second vent 31 and the bottom of the first receiving tank 42 is H7, in mm, where H7 ≤ 5. This setting limits the distance between the second vent 31 and the bottom of the first receiving tank 42, preventing excessive distance between them from causing electrolyte to splash when dripping from the second vent 31.

[0068] See again Figure 4 The retainer 3 includes a main body 32 and a protrusion 33. The protrusion 33 is connected to the side of the main body 32 near the plastic part 4 and protrudes from the main body 32. The main body 32 has a second vent 31. The protrusion 33 is located on the outside of the groove wall of the first receiving groove 42. The protrusion 33 and the plastic part 4 are spaced apart.

[0069] In practical applications, the protrusion 33 is located outside the first receiving tank 42 and protrudes from the main body 32. In this way, when the electrolyte splashes outward from the first receiving tank 42, the protrusion 33 can also play a blocking role to a certain extent, effectively preventing the electrolyte from splashing everywhere.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0072] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A top cover structure, characterized in that, include: The top cover has explosion-proof holes; An explosion-proof valve is connected to the top cover plate and seals the explosion-proof hole; A plastic part having a through first vent, the projection of the first vent along the axial direction of the explosion-proof hole being located outside the explosion-proof valve.

2. The top cover structure according to claim 1, characterized in that, The top cover structure includes a retainer for abutting against the core package. The retainer is located on the side of the plastic part away from the top cover sheet. The retainer has a through second vent, which communicates with the first vent.

3. The top cover structure according to claim 2, characterized in that, The plastic part has a first receiving groove, which is disposed opposite to the second vent.

4. The top cover structure according to claim 3, characterized in that, Projected along the axis perpendicular to the explosion-proof hole, the distance between the first receiving groove and the first exhaust port is greater than the distance between the first receiving groove and the second exhaust port.

5. The top cover structure according to claim 3, characterized in that, The plastic part includes a first plate, a second plate, and a third plate connected sequentially along its height direction. The second plate is connected to the first plate and the third plate respectively. The first plate has the first receiving groove, and the third plate has the first vent.

6. The top cover structure according to claim 5, characterized in that, The plastic part includes a fourth plate and a fifth plate connected sequentially along its height direction. The fourth plate is connected to the third plate, and the fifth plate abuts against the top cover sheet.

7. The top cover structure according to claim 3, characterized in that, The depth of the first receiving groove is H1, in mm, and the height of the plastic part is H2, in mm, wherein 0.1≤H1≤0.8H2.

8. The top cover structure according to claim 3, characterized in that, In the axial direction of the explosion-proof hole, the projection of the first receiving groove covers the second exhaust port.

9. The top cover structure according to claim 1, characterized in that, The top cover plate has a second receiving groove, which is disposed opposite to the first exhaust port.

10. The top cover structure according to claim 9, characterized in that, The top cover includes a baffle and a cover body. The baffle and the cover body are connected. The baffle is located between the second receiving groove and the explosion-proof valve. Along the axial direction of the explosion-proof hole, the distance between the baffle and the plastic part is less than the distance between the second receiving groove and the plastic part.

11. The top cover structure according to claim 10, characterized in that, Along the height direction of the plastic part, the distance between the first vent and the cover body is H3, in mm, and the maximum distance between the baffle and the cover body is H4, in mm, where 0.2≤H4≤0.8H3.

12. The top cover structure according to claim 10, characterized in that, The depth of the second receiving groove is H5, in mm, and the thickness of the cover body is H6, in mm, wherein 0.05H6≤H5≤0.5H6.

13. The top cover structure according to any one of claims 1 to 12, characterized in that, Along the axial direction of the explosion-proof hole, the distance between the first exhaust port and the top cover plate is H3, in mm, and the height of the plastic part is H2, in mm, wherein H3≤0.5H2.

14. The top cover structure according to claim 3, characterized in that, The distance between the second exhaust port and the bottom of the first receiving tank is H7, in mm, and H7≤5.

15. The top cover structure according to claim 3, characterized in that, The retainer includes a main body and a protrusion. The protrusion is connected to the side of the main body near the plastic part and protrudes from the main body. The main body has a second vent. The protrusion is located outside the groove wall of the first receiving groove. The protrusion and the plastic part are spaced apart.

16. A battery, characterized in that, The invention includes the top cover structure as described in any one of claims 1 to 15, as well as the core package and the housing, wherein the top cover structure and the housing are connected, and the core package is disposed within the housing.

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