Top cover assembly, battery monomer, battery and electric device

Abstract

The utility model relates to a top cover assembly. A top cover piece is provided with a liquid blocking groove located between a pole hole and a liquid injection hole. The liquid blocking groove can play a blocking role between the liquid injection hole and the pole hole, and when the electrolyte overflows, the liquid blocking groove can effectively prevent the electrolyte overflowing from the liquid injection hole from flowing to the pole. Moreover, as the plastic component at least covers the first edge of the liquid blocking groove, that is, the side, at least close to the pole hole, of the liquid blocking groove is covered by the plastic component, the plastic component can effectively protect the liquid blocking groove so as to prevent the liquid blocking groove from being collided and damaged. Moreover, when the overflow amount of the electrolyte is too large or the electrolyte overflows in a splashing manner, the plastic assembly can also prevent the electrolyte from directly crossing the liquid blocking groove. Therefore, under the actual working condition, the liquid blocking groove is not prone to blocking failure. Therefore, the top cover assembly can effectively prevent the electrolyte from entering the pole, so that the reliability of the battery is remarkably improved. In addition, the utility model also provides a battery monomer, a battery and an electric device.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a top cover assembly, a battery cell, a battery and an electrical device. Background Art

[0002] The top cover assembly of a battery generally includes a cover plate, upper plastic, lower plastic, a sealing ring, and a terminal. The terminal passes through the terminal hole in the cover plate and is insulated and sealed by the upper plastic, lower plastic, and sealing ring. The cover plate is provided with an injection hole for injecting electrolyte into the shell. During the injection process, electrolyte overflow may occur. The overflowed electrolyte may flow into the terminal through the gap between the cover plate and the upper plastic and remain inside for a long time, causing corrosion damage to the terminal and the sealing ring, resulting in terminal fracture or sealing failure of the sealing ring, which may lead to battery failure. Utility Model Content

[0003] Based on this, it is necessary to provide a top cover assembly that can effectively prevent the electrolyte overflowing from the injection hole from entering the electrode, thereby improving the reliability of the battery, in order to address the above problems.

[0004] On the one hand, the present application provides a top cover assembly, comprising

[0005] A top cover plate is provided with a pole hole and a liquid injection hole, wherein an outer surface of the top cover plate is formed with a liquid blocking groove located between the pole hole and the liquid injection hole, wherein the liquid blocking groove has a first edge on a side close to the pole hole and a second edge on a side away from the pole hole;

[0006] A pole, passing through the pole hole and fixed to the top cover; and

[0007] The plastic component is disposed between the pole and the top cover sheet, and the portion of the plastic component extending to the outer surface of the top cover sheet at least covers the first edge of the liquid blocking groove.

[0008] In one embodiment, the liquid-blocking groove is arc-shaped, and the concave side of the liquid-blocking groove faces the pole hole.

[0009] In one embodiment, the liquid-blocking groove is annular and extends along the circumference of the pole hole.

[0010] In one embodiment, the plastic component includes an upper plastic and a sealing ring, the upper plastic is clamped between the pole and the outer surface of the top cover plate, the liquid blocking groove is covered by the upper plastic, and the sealing ring is sleeved on the pole and clamped between the pole and the inner wall of the pole hole.

[0011] In one embodiment, at least one positioning hole is formed on the outer surface of the top cover sheet along the circumference of the pole hole, and a positioning column is formed on the side of the upper plastic facing the top cover sheet, and the positioning column is embedded in the corresponding positioning hole.

[0012] In one embodiment, the liquid-blocking groove is at least partially connected to the plurality of positioning holes.

[0013] In one embodiment, the width of the liquid-blocking groove is less than or equal to the diameter of the positioning hole, and the depth of the liquid-blocking groove is less than or equal to the depth of the positioning hole.

[0014] In one embodiment, the distance between the bottom of the liquid blocking groove and the bottom surface of the upper plastic is greater than or equal to 0.1 mm and less than or equal to 0.6 times the thickness of the top cover sheet.

[0015] In one embodiment, the upper plastic portion is embedded in the liquid-blocking groove.

[0016] In one embodiment, the upper plastic is embedded in a side of the liquid-blocking groove close to the first edge.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] In the above-mentioned top cover assembly, the liquid blocking groove can act as a barrier between the liquid injection hole and the pole hole. When electrolyte overflow occurs during the liquid injection process, the liquid blocking groove can effectively prevent the electrolyte overflowing from the liquid injection hole from flowing to the pole. Moreover, since the plastic component covers at least the first edge of the liquid blocking groove, that is, at least the side of the liquid blocking groove close to the pole hole is covered by the plastic component, the plastic component can effectively protect the liquid blocking groove to avoid damage to the liquid blocking groove. Moreover, when the amount of electrolyte overflow is too large or overflows in the form of splashing, the plastic component can also prevent the electrolyte from directly crossing the liquid blocking groove. It can be seen that under actual operating conditions, the liquid blocking groove is not prone to blocking failure. Therefore, the above-mentioned top cover assembly can effectively prevent the electrolyte from entering the interior of the pole, thereby significantly improving the reliability of the battery.

[0019] On the other hand, the present application provides a battery cell, comprising a shell, a battery cell and a top cover assembly as described in any one of the preferred embodiments above, wherein an opening is provided at at least one end of the shell, the battery cell is accommodated in the shell, and the top cover assembly is installed on the shell and covers the opening.

[0020] On the other hand, the present application provides a battery comprising a plurality of battery cells as described in the above preferred embodiments.

[0021] In addition, the present application also provides an electrical device, including the battery cell described in the preferred embodiment or the battery described in the preferred embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a structural diagram of a top cover assembly in one embodiment of the present utility model;

[0024] Figure 2 for Figure 1 A cross-sectional view of the top cover assembly along AA is shown;

[0025] Figure 3 for Figure 1 A schematic structural diagram of a top cover piece in the top cover assembly shown;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of the pole in the top cover assembly shown;

[0027] Figure 5 This is a structural schematic diagram of a top cover assembly in another embodiment of the present utility model;

[0028] Figure 6 for Figure 5 A cross-sectional view of the top cover assembly along line BB is shown;

[0029] Figure 7 for Figure 5 Schematic diagram of the structure of the top cover piece in the top cover assembly shown. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0032] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0036] The utility model discloses an electric device, a battery and a battery cell. The electric device includes the battery or the battery cell, and can be provided with electric energy by the battery or the battery cell. The electric device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement ride, an elevator and a lifting device, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. Energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc. Amusement rides can be carousels, bungee jumping machines, etc.

[0037] The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. A new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. For new energy vehicles, the battery may serve as a driving power source, thereby replacing fossil fuels in providing driving power. This application does not impose any specific restrictions on the electrical device.

[0038] The above-mentioned battery can be a battery pack or a battery module. When the above-mentioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and a plurality of the above-mentioned battery cells. The plurality of battery cells can be electrically connected in series, in parallel, or in a mixture of series and parallel, and communicated with the battery management system to form a battery pack. The above-mentioned battery management system controls and monitors the working status of each battery cell. In addition, the plurality of battery cells can also be connected in series and / or in parallel first, and form a battery module with the module management system, and then the plurality of battery modules are electrically connected in series, in parallel, or in a mixture of series and parallel, and together with the battery management system form a battery pack.

[0039] The battery cell can be a lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, and its outer contour can be flat, rectangular or other shapes, but is not limited thereto. Specifically, in this embodiment, the battery cell is a lithium-ion square-shell battery.

[0040] Also, see Figures 1 to 7 The present invention further provides a top cover assembly 100. The battery cell comprises a top cover assembly 100, a shell (not shown) and a battery cell (not shown).

[0041] The shell is a hollow structure with a storage space inside for accommodating battery cells, electrolyte and other components. At least one end of the shell is provided with an opening, through which the battery cells can be loaded into the shell. Since the battery cell in this embodiment is a square battery, the outer contour of the shell is a rectangular parallelepiped and its opening is rectangular. The top cover assembly 100 is mounted on the shell and covers its opening, thereby forming a relatively closed environment inside the shell to isolate the battery cells from the external environment. Since the shape of the top cover assembly 100 needs to match the shape of the opening of the shell, the top cover assembly 100 is roughly rectangular.

[0042] See also Figure 2 and Figure 3 In one embodiment of the present invention, a top cover assembly 100 includes a top cover sheet 110 , a pole 120 and a plastic assembly 130 .

[0043] The top cover sheet 110 can be formed from a material with high mechanical strength, such as aluminum, an aluminum alloy, or stainless steel. The top cover sheet 110 has an outer surface and an inner surface that are oppositely disposed. The inner surface refers to the surface of the top cover sheet 110 facing the interior of the housing, while the outer surface refers to the surface of the top cover sheet 110 facing away from the interior of the housing. The top cover sheet 110 is provided with a terminal hole 111 and a liquid injection hole 112.

[0044] The pole 120 is inserted into the pole hole 111 and fixed to the top cover 110. For the top cover assembly 100 suitable for square shell batteries, the top cover 110 has two spaced pole holes 111, which are used to install the positive pole and the negative pole respectively. The structure and assembly method of the positive pole and the negative pole are generally exactly the same. Generally, they can be installed with the top cover 110 by means of riveting. The electrolyte can be injected into the shell through the injection hole 112. The injection hole 112 is generally set in the middle of the top cover 110. In the case of two pole holes 111, the injection hole 112 is located between the two pole holes 111.

[0045] Please also refer to Figure 4 In this embodiment, the pole 120 includes a lower pole 121 and an upper pole 122. The lower pole 121 includes a lower mounting block 1211 and a column 1212 extending from one side of the lower mounting block 1211. The lower mounting block 1211 is supported on the inner surface of the top cover 110 and the column 1212 passes through the pole hole 111. The upper pole 122 is fixed to an end of the column 1212 away from the lower mounting block 1211. The upper pole 122 cooperates with the lower mounting block 1211 to clamp the top cover 110 to fix the pole 120 to the top cover 110.

[0046] During assembly, first insert the lower pole 121 from the inside of the top cover sheet 112 until the lower mounting block 1211 abuts against the inner surface of the top cover sheet 110, and then put the upper pole 122 on the end of the column 1212 protruding from the outer surface of the top cover sheet 110. The upper pole 122 and the column 1212 can be fixed by first riveting and then welding. Dividing the pole 120 into two parts can facilitate molding and assembly. Moreover, since the upper pole 122 is plate-shaped and has a large contact area with the outer surface, it can provide reliable preload force. In other embodiments, the pole 120 can also be directly installed on the top cover sheet 110 by riveting.

[0047] Please refer again Figure 2 The plastic component 130 is generally formed of a flexible material such as rubber or silicone, and can produce elastic deformation when extruded. The plastic component 130 is disposed between the pole 120 and the top cover sheet 110, and generally serves to insulate or seal the pole 120 and the top cover sheet 110. Specifically, in this embodiment, the plastic component 130 can form insulation and a seal between the pole 120 and the outer surface of the top cover sheet 110, between the pole 120 and the inner surface of the top cover sheet 110, and between the pole 120 and the inner wall of the pole hole 111, thereby improving the insulation and sealing performance between the pole 120 and the top cover sheet 110.

[0048] More specifically, in this embodiment, the plastic component 130 includes an upper plastic 131 and a sealing ring 132. The upper plastic 131 is clamped between the pole 120 and the outer surface of the top cover 110. The sealing ring 132 is sleeved on the pole 120 and clamped between the pole 120 and the inner wall of the pole hole 111.

[0049] The upper plastic 131 and the sealing ring 132 can be made of the same material, and the upper plastic 131 can be injection molded. Specifically, the upper plastic 131 is pressed between the upper terminal 122 and the outer surface of the top cover 110, providing insulation and sealing between the upper terminal 122 and the outer surface of the top cover 110. The sealing ring 132 is fitted over the column 1212 to provide insulation and sealing between the column 1212 and the inner wall of the terminal hole 111.

[0050] Furthermore, in this embodiment, the plastic assembly 130 also includes a lower plastic member 133. The lower plastic member 133 covers the inner surface of the top cover 110 and is partially sandwiched between the lower mounting block 1211 and the inner surface of the top cover 110. The material of the lower plastic member 133, along with the upper plastic member 131 and the sealing ring 132, provides good insulation between the top cover 110 and the battery cell. Furthermore, the lower plastic member 133 also provides insulation and a seal between the lower mounting block 1211 and the top cover 110.

[0051] It should be noted that, in other embodiments, the upper plastic 131 , the sealing ring 132 and the lower plastic 133 may also be integrally formed plastic components.

[0052] Please refer again Figure 3 A liquid blocking groove 113 is further formed on the outer surface of the top cover sheet 110. The liquid blocking groove 113 is located between the terminal hole 111 and the liquid injection hole 112. Furthermore, the liquid blocking groove 113 has a first edge on the side close to the terminal hole 111 and a second edge on the side away from the terminal hole 111. The first and second edges extend in the same direction as the liquid blocking groove 113, and the distance between the first and second edges is the width of the liquid blocking groove 113.

[0053] The liquid blocking groove 113 acts as a barrier between the liquid injection hole 112 and the terminal hole 111. Typically, the liquid blocking groove 113 has a width greater than or equal to 0.5 mm and a depth greater than or equal to 0.1 mm, effectively blocking the electrolyte. If electrolyte overflow occurs during the injection process, the liquid blocking groove 113 effectively prevents the electrolyte from overflowing from the liquid injection hole 112 from flowing toward the terminal 120.

[0054] Furthermore, the portion of the plastic component 130 that extends to the outer surface of the top cover sheet 110 at least covers the first edge of the liquid blocking groove 113. Specifically, the portion of the plastic component 130 that extends to the outer surface of the top cover sheet 110 refers to the upper plastic 131, that is, the liquid blocking groove 113 is covered by the upper plastic 131. Since at least one side of the liquid blocking groove 113 close to the pole hole 111 is covered by the plastic component 130, the plastic component 130 can effectively protect the liquid blocking groove 113 to prevent the liquid blocking groove 113 from being damaged by collision. Moreover, when the electrolyte overflow is too large or overflows in the form of splashing, the plastic component 130 can also prevent the electrolyte from directly crossing the liquid blocking groove 113, so the liquid blocking groove 113 is not prone to blocking failure.

[0055] Preferably, in this embodiment, both the first and second edges of the liquid-blocking groove 113 are covered by the plastic component 130, that is, the entire liquid-blocking groove 113 is covered by the plastic component 130. In this manner, the plastic component 130 provides better protection for the liquid-blocking groove 113. Furthermore, the shielding provided by the plastic component 130 prevents electrolyte from entering the liquid-blocking groove 113 from the side of the second edge of the liquid-blocking groove 113, thereby further improving the electrolyte barrier effect.

[0056] Specifically, in this embodiment, the distance between the bottom of the liquid-blocking groove 113 and the bottom surface of the upper plastic 131 is greater than or equal to 0.1 mm and less than or equal to 0.6 times the thickness of the top cover sheet 110. The distance between the bottom of the liquid-blocking groove 113 and the bottom surface of the upper plastic 131 is roughly the depth of the liquid-blocking groove 113. If it is less than 0.1 mm, the liquid-blocking groove 113 is too shallow to effectively block the electrolyte. If it is greater than 0.6 times the thickness of the top cover sheet 110, the excessive groove depth will result in the strength of the top cover sheet 110 being too low, and it is easy to crack at this weak point when subjected to external forces.

[0057] In this embodiment, the upper plastic 131 is partially embedded in the liquid blocking groove 113. The upper plastic 131 and the liquid blocking groove 113 are engaged with each other, which can play a role in positioning and limiting the upper plastic 131. It can prevent the upper plastic 131 from rotating around the center line of the pole hole 111 to a certain extent, thereby helping to improve the stability of the upper plastic 131 and effectively preventing the sealing failure of the liquid blocking groove 113 caused by the displacement of the upper plastic 131.

[0058] Furthermore, in this embodiment, the upper plastic 131 is embedded in the side of the liquid blocking groove 113 near the first edge. Thus, when the electrolyte in the liquid blocking groove 113 flows toward the first edge, it needs to bypass the bottom of the upper plastic 131 to reach the first edge. Therefore, the upper plastic 131 can enhance the electrolyte barrier effect and effectively prevent the electrolyte from overflowing from the first edge of the liquid blocking groove 113.

[0059] In this embodiment, at least one positioning hole 114 is formed on the outer surface of the top cover plate 110 along the circumference of the pole hole 111. A corresponding positioning post (not shown) is formed on the side of the upper plastic 131 facing the top cover plate 110. The positioning post is embedded in the corresponding positioning hole 114. The positioning hole 114 and the positioning post cooperate to further prevent the upper plastic 131 from rotating about the centerline of the pole hole 111, thereby further improving the assembly stability of the upper plastic 131.

[0060] To achieve better positioning, multiple positioning holes 114 are provided along the circumference of the terminal hole 111, and multiple positioning posts are correspondingly provided on the upper plastic 131. Furthermore, in this embodiment, the liquid blocking groove 113 is at least partially connected to the multiple positioning holes 114. This positioning hole 114 also serves to position the liquid blocking groove 113, facilitating accurate grooving of the outer surface of the top cover sheet 110 to form the liquid blocking groove 113 during processing.

[0061] Furthermore, in this embodiment, the width of the liquid-blocking groove 113 is less than or equal to the diameter of the positioning hole 114, and the depth of the liquid-blocking groove 113 is less than or equal to the depth of the positioning hole 114. In other words, the interior of the liquid-blocking groove 113 is shallower and narrower than the positioning hole 114, and the positioning post in the positioning hole 114 cannot enter the liquid-blocking groove 113 from the positioning hole 114. Therefore, the upper plastic 131 can be further prevented from rotating.

[0062] The diameter of positioning hole 114 is generally greater than or equal to its depth, and the diameter and height of the positioning post match the diameter and depth of positioning hole 114. Specifically, the depth of positioning hole 114 is greater than or equal to 0.2 mm and less than or equal to 0.5 times the thickness of top cover sheet 110. If the positioning post is too short or the positioning hole 114 is too shallow, the post can easily slip out of positioning hole 114 when the pole 120 is subjected to torsional forces. If the positioning post is too long or the positioning hole 114 is too deep, the structural strength of top cover sheet 110 can be compromised, making it more susceptible to deformation and breakage.

[0063] Also, please refer again to Figure 3 In this embodiment, the liquid blocking groove 113 is annular and extends along the circumference of the pole hole 111 .

[0064] The liquid blocking groove 113 can be in the shape of a circular ring, a rectangular ring, or the like. The annular liquid blocking groove 113 can completely surround the electrode hole 111, thereby blocking the electrolyte from all directions, achieving a better blocking effect. Moreover, since the annular liquid blocking groove 113 has a large slot area, it has a significant impact on the structural strength of the top cover sheet 110. Therefore, the distance between the bottom of the annular liquid blocking groove 113 and the bottom surface of the upper plastic 131 is preferably less than or equal to 0.5 times the thickness of the top cover sheet 110.

[0065] It should be noted that the liquid blocking groove 113 is not limited to being annular. Figures 5 to 7 In another embodiment shown, the liquid-blocking groove 113 is arc-shaped, and the concave side of the liquid-blocking groove 113 faces the pole hole 111 .

[0066] The arc-shaped liquid blocking groove 113 can surround a portion of the terminal hole 111 and can also effectively block the terminal hole 111, thereby blocking the electrolyte. Moreover, since the slot area of ​​the liquid blocking groove 113 is small, the impact on the structural strength of the top cover plate 110 can be minimized.

[0067] Therefore, compared with the annular liquid-blocking groove 113, the arc-shaped liquid-blocking groove 113 can be deeper while ensuring the structural strength of the top cover 110. The distance between the bottom of the arc-shaped liquid-blocking groove 113 and the bottom surface of the upper plastic 131 only needs to be less than or equal to 0.6 times the thickness of the top cover 110.

[0068] It should be pointed out that Figures 5 to 7 In another embodiment shown, other structures and assembly relationships can be Figures 1 to 4 The first embodiment shown is the same and will not be described again here.

[0069] In the top cap assembly 100, the liquid blocking groove 113 acts as a barrier between the liquid injection hole 112 and the terminal hole 111. If electrolyte overflow occurs during the injection process, the liquid blocking groove 113 effectively prevents the electrolyte overflowing from the liquid injection hole 112 from flowing toward the terminal 120. Furthermore, because the plastic component 130 covers at least the first edge of the liquid blocking groove 113—that is, at least the side of the liquid blocking groove 113 closest to the terminal hole 111—the plastic component 130 effectively protects the liquid blocking groove 113, preventing it from being damaged by bumps. Furthermore, if the electrolyte overflow is excessive or splashes, the plastic component 130 prevents the electrolyte from directly flowing over the liquid blocking groove 113. As can be seen, under actual operating conditions, the liquid blocking groove 113 is unlikely to fail. Therefore, the top cap assembly 100 effectively prevents electrolyte from entering the interior of the terminal 120, significantly improving battery reliability.

Claims

1. A top cover assembly, characterized in that: include A top cover plate is provided with a pole hole and a liquid injection hole, wherein an outer surface of the top cover plate is formed with a liquid blocking groove located between the pole hole and the liquid injection hole, wherein the liquid blocking groove has a first edge on a side close to the pole hole and a second edge on a side away from the pole hole; A pole, passing through the pole hole and fixed to the top cover; and The plastic component is disposed between the pole and the top cover sheet, and the portion of the plastic component extending to the outer surface of the top cover sheet at least covers the first edge of the liquid blocking groove.

2. The top cover assembly according to claim 1, wherein: The liquid-blocking groove is arc-shaped, and a concave side of the liquid-blocking groove faces the pole hole.

3. The top cover assembly according to claim 1, wherein: The liquid-blocking groove is annular and extends along the circumference of the pole hole.

4. The top cover assembly according to claim 1, wherein: The plastic component includes an upper plastic and a sealing ring. The upper plastic is clamped between the pole and the outer surface of the top cover plate. The liquid blocking groove is covered by the upper plastic. The sealing ring is sleeved on the pole and clamped between the pole and the inner wall of the pole hole.

5. The top cover assembly according to claim 4, wherein: At least one positioning hole is formed on the outer surface of the top cover sheet along the circumference of the pole hole, and a positioning column is correspondingly formed on the side of the upper plastic facing the top cover sheet, and the positioning column is embedded in the corresponding positioning hole.

6. The top cover assembly according to claim 5, characterized in that The liquid-blocking groove is at least partially communicated with the plurality of positioning holes.

7. The top cover assembly according to claim 6, wherein: The width of the liquid-blocking groove is smaller than or equal to the diameter of the positioning hole, and the depth of the liquid-blocking groove is smaller than or equal to the depth of the positioning hole.

8. The top cover assembly according to claim 4, wherein: The distance between the bottom of the liquid-blocking groove and the bottom surface of the upper plastic is greater than or equal to 0.1 mm and less than or equal to 0.6 times the thickness of the top cover sheet.

9. The top cover assembly according to claim 4, wherein: The upper plastic portion is embedded in the liquid-blocking groove.

10. The top cover assembly according to claim 9, wherein: The upper plastic is embedded in a side of the liquid-blocking groove close to the first edge.

11. A battery cell, characterized in that: The battery comprises a shell, a battery cell and a top cover assembly as claimed in any one of claims 1 to 10, wherein at least one end of the shell is provided with an opening, the battery cell is accommodated in the shell, and the top cover assembly is mounted on the shell and covers the opening.

12. A battery, characterized in that: The battery comprises a plurality of battery cells as claimed in claim 11.

13. An electrical device, characterized in that: The battery cell according to claim 11 or the battery according to claim 12 is included.

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