Battery cell cover plate and battery cell

Abstract

The utility model relates to lithium battery technical field provides a kind of electric core cover plate and electric core, electric core cover plate includes cover plate body, pole bottom plate and plastic part;Plastic part is located on cover plate body, and installation groove is formed in plastic part, pole bottom plate is located in installation groove, and there is around gap between the outer contour surface of pole bottom plate and installation groove;Wherein, at least one gap is set on the side wall perpendicular to the flow direction of electrolyte in installation groove, and the gap is communicated with around gap.The utility model is set with gap on the side wall of installation groove side, so that the electrolyte accumulated in around gap can be discharged in time, to avoid the short circuit of electrolyte long-term accumulation and electrode bottom plate and other safety effects.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used in various industries due to their advantages such as large capacity, high operating voltage, strong charge retention, and long cycle life. The battery cell is the smallest unit of a lithium battery pack, and it generally consists of electrode components, electrolyte, bare cell insulating sheets, a cover plate (usually integrating terminals, filling holes, explosion-proof valves, etc.), and a casing. During connection, the cover plate is fixedly connected to the casing, creating a sealed space for the electrode components.

[0003] The cover plate typically includes the terminal post, a light aluminum sheet, an upper plastic layer, a lower plastic layer, and a sealing ring. In related technologies, in the battery pack of blade cells, the cell is generally placed sideways with the cover plate upright. Electrolyte often accumulates in the gap between the terminal post base and the lower plastic rib. Over time, the electrolyte reacts with lithium ions to produce lithium dendrites. As time goes on, the lithium dendrites gradually grow outward along the gap between the terminal post base and the lower plastic rib, eventually causing a short circuit between the terminal post base and the light aluminum sheet or the casing, resulting in a safety malfunction. Utility Model Content

[0004] This utility model provides a cell cover plate and a cell to solve the problem in the prior art where the electrolyte at the electrode base plate position is difficult to drain, resulting in a high safety risk over a long period of time.

[0005] The first aspect of this utility model provides a battery cell cover plate, comprising: a cover plate body, a terminal base plate, and a plastic component; the plastic component is disposed on the cover plate body, and an installation groove is formed within the plastic component; the terminal base plate is disposed within the installation groove, and a circumferential gap exists between the outer contour surface of the terminal base plate and the installation groove; wherein, at least one notch is formed on the side wall in the length direction of the installation groove, and the notch communicates with the circumferential gap.

[0006] According to the battery cell cover plate provided by this utility model, a support structure is provided on the outer side of the side wall of the mounting groove where the notch is provided, and the support structure is used to strengthen the structural strength of the plastic part.

[0007] According to the battery cell cover provided by this utility model, the support structure includes raised reinforcing ribs, and the reinforcing ribs extend from the notch position along the length direction of the plastic part.

[0008] According to the battery cell cover provided by this utility model, the width of the reinforcing rib in the width direction is 1-3mm, and the maximum extension length of the reinforcing rib in the length direction is 0.5-2mm.

[0009] According to the battery cell cover provided by this utility model, the supporting structure includes a raised reinforcing rib plate, and the reinforcing rib plate extends from the notch position and is biased towards the central axis of the plastic part in the length direction.

[0010] According to the battery cell cover provided by this utility model, the upper surface of the reinforcing rib plate is flush with the upper surface of the side wall having the notch.

[0011] According to the battery cell cover plate provided by this utility model, the width of the notch in the width direction is 0.8-2mm.

[0012] According to the battery cell cover provided by this utility model, the mounting groove includes a bottom wall, a first side wall, a second side wall, a third side wall, and a fourth side wall. The bottom wall is used to form the lower surface of the mounting groove. The first side wall, the second side wall, the third side wall, and the fourth side wall sequentially surround and form the circumferential surface of the mounting groove. The notch is provided at the end of the first side wall adjacent to the second side wall and at the other end of the first side wall adjacent to the fourth side wall.

[0013] According to the battery cell cover provided by this utility model, the plastic part includes a supporting connecting surface, the mounting groove is disposed on the supporting connecting surface, and the lower surface of the mounting groove is higher than the supporting connecting surface of the plastic part in the thickness direction.

[0014] The second aspect of this utility model provides a battery cell, including the battery cell cover plate described in any one of the above-mentioned embodiments.

[0015] This utility model provides a battery cell cover plate and a battery cell. The battery cell cover plate has a notch on the side wall of the mounting groove, so that the electrolyte accumulated in the surrounding gap can be discharged in time, avoiding the safety impact of short circuit caused by long-term accumulation of electrolyte and electrode base plate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of the battery cell provided by this utility model.

[0018] Figure 2 This is one of the structural schematic diagrams of the battery cell cover plate provided by this utility model.

[0019] Figure 3This utility model provides Figure 2 A magnified structural diagram at point B in the middle.

[0020] Figure 4 This is a top view of the battery cell cover plate provided by this utility model.

[0021] Figure 5 This utility model provides Figure 4 Schematic diagram of the cross-sectional structure along the AA direction.

[0022] Figure 6 This is the second structural schematic diagram of the battery cell cover plate provided by this utility model.

[0023] Figure label:

[0024] 1. Cell cover plate; 2. Cell; 11. Cover plate body; 12. Plastic part; 121. Mounting groove; 1211. Bottom wall; 1212. First side wall; 1213. Second side wall; 1214. Third side wall; 1215. Fourth side wall; 122. Notch; 123. Support connection surface; 124. Intermediate rib strip; 13. Terminal base plate; 14. Reinforcing rib; 15. Reinforcing rib plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0028] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] The following is combined with Figures 1-5This invention describes a battery cell cover plate, comprising a cover plate body 11, an electrode base plate 13, and a plastic component 12. The plastic component 12 is disposed on the cover plate body 11, and an mounting groove 121 is formed within the plastic component 12. The electrode base plate 13 is disposed within the mounting groove 121, and there is a surrounding gap between the outer contour surface of the electrode base plate 13 and the mounting groove 121. The mounting groove 121 has at least one notch 122 on its side wall in the length direction X (perpendicular to the electrolyte flow direction), and the notch 122 communicates with the surrounding gap. Typically, electrolyte seeps into the gap between the electrode base plate 13 and the plastic component 12. Over time, the electrolyte accumulates around the electrode base plate 13, reacting with lithium ions to produce lithium dendrites. As time progresses, these lithium dendrites gradually grow outward along the gap between the electrode base plate 13 and the plastic component, leading to faults such as short circuits. In this embodiment, by opening a notch 122 on the side wall of the mounting groove 121, the direction of electrolyte flow is defined in the mounting groove 121 after the battery cell 2 is installed. As a result, the electrolyte can flow out in time through the notch 122, preventing the long-term accumulation of electrolyte in the mounting groove 121. This avoids the problem of lithium dendrites growing into the gap between the electrode base plate 13 and the plastic part 12 due to long-term accumulation, thus improving safety.

[0031] Specifically, the cover plate body 11 includes a smooth aluminum sheet, on which a plastic part 12 is formed. The plastic part 12 serves as a mounting platform for the electrode base plate 13, and an mounting groove 121 is formed inside it. A through-hole structure is provided in the mounting groove 121. The electrode base plate 13 is disposed in the mounting groove 121 and is electrically connected to the cover plate body 11 through the through-hole structure. Specifically, the plastic part 12 as a whole can serve as an insulating layer, providing a certain degree of protection. In this embodiment, by opening a notch 122 on one side wall of the mounting groove 121, the electrolyte can be allowed to flow out in a timely manner, avoiding the electrolyte from accumulating in the mounting groove 121 for a long time and reducing the risk of short circuit.

[0032] The plastic component 12 is made of rigid plastic, which provides sufficient strength, rigidity, and durability to ensure that the battery cover can withstand external pressure, vibration, impact, and other factors during actual use without deformation or damage. Specifically, engineering plastics or injection-molded rigid plastics can be used. For example, polypropylene, polycarbonate, and other materials can be used.

[0033] Furthermore, such as Figure 1 , Figure 2As shown, when the blade battery is installed, the cell cover plate 1 is located on one side of the cell 2, which allows the electrolyte in the mounting groove 121 to flow downwards (the direction of electrolyte flow in the figure). In this embodiment, by providing a notch 122 on the side wall of the mounting groove 121 that is perpendicular to the direction of electrolyte flow, the electrolyte can be discharged through the notch 122, avoiding the accumulation of electrolyte in the mounting groove 121 and realizing the timely and rapid discharge of electrolyte.

[0034] It is understandable that lithium batteries, especially blade batteries, require careful installation and placement, such as... Figure 1 As shown, the terminals of the battery cell 2 are typically oriented downwards. Electrolyte often accumulates in the gap between the terminal base plate 13 and the plastic component 12, flowing downwards. In related technologies, to ensure high structural strength of the plastic component 12, a grid-like reinforcing rib structure 14 is often installed outside the mounting groove 121. This creates a "barrier" structure around the mounting groove, causing electrolyte to accumulate in the surrounding gap between the terminal base plate 13 and the mounting groove 121. Prolonged electrolyte accumulation can react with lithium ions to form lithium dendrites, which gradually grow outwards along the gap between the terminal base plate 13 and the plastic component 12. In this embodiment, a notch 122 is created on the side wall of the mounting groove 121. This notch allows for timely drainage of the electrolyte within the mounting groove 121, preventing the long-term accumulation of electrolyte and the resulting outward growth of lithium dendrites.

[0035] In specific settings, such as Figure 2 , Figure 3 As shown, the notch 122 is a rectangular notch structure. This notch structure allows communication between the internal and external spaces of the mounting groove 121, preventing electrolyte from accumulating within it. It is understood that the battery is typically not disassembled after installation. Therefore, a region for electrolyte accumulation is formed in the lower area of ​​the mounting groove 121 (the lower area in the usage state). The electrolyte in the mounting groove 121 drains and flows into this region for accumulation.

[0036] Of course, in this embodiment, the number of notches 122 is not limited; it can be one, two, or more. Setting two or more notches can increase the electrolyte discharge rate. Setting it to one notch can strengthen the overall structural strength and reduce the difficulty of preparation.

[0037] In conjunction with the above embodiments, the mounting groove 121 includes a bottom wall 1211, a first side wall 1212, a second side wall 1213, a third side wall 1214, and a fourth side wall 1215. The bottom wall 1211 forms the lower surface of the mounting groove 121, and the first side wall 1212, second side wall 1213, third side wall 1214, and fourth side wall 1215 sequentially enclose the circumferential surface of the mounting groove 121. Notches 122 are provided at the ends of the first side wall 1212 adjacent to the second side wall 1213 and the first side wall 1212 adjacent to the fourth side wall 1215. The mounting groove 121 is used to connect the electrode base plate 13. When the electrolyte is discharged, it needs to be discharged through the notches 122. In this embodiment, notches 122 are provided on both sides of the first side wall 1212 to achieve timely discharge of the electrolyte.

[0038] Specifically, such as Figure 1 As shown, the first sidewall 1212 is perpendicular to the flow direction of the electrolyte. When the battery cell 2 is in use, the first sidewall 1212 serves as the bottom of the mounting groove 121 along the electrolyte flow direction, enabling rapid discharge of the electrolyte and preventing its accumulation within the mounting groove 121. Two notches 122 divide the circumferential surface of the mounting groove 122, allowing the electrolyte to flow out through these notches. The two notches 122 notch design not only facilitate rapid discharge of the electrolyte within the surrounding gap but also ensure overall structural strength, preventing excessive notches 122 from affecting the overall structural integrity.

[0039] The plastic component 12 has a long, narrow structure, and the mounting groove 121 is a rectangular groove, biased towards one end of the plastic component 12. This provides ample storage space at both ends of the mounting groove 121 and the plastic component 12. The electrode base plate 13 is located within the rectangular groove, and there is a surrounding gap between the electrode base plate 13 and the mounting groove 121. When electrolyte accumulates in the surrounding gap, it can flow into the storage space through the notch 122, thus preventing the electrolyte from remaining in the mounting groove 121 for an extended period and affecting the safety of the battery cell 2. It is known that the amount of electrolyte leakage is usually not large, and the storage space is sufficient to accommodate the leaked electrolyte.

[0040] In specific implementation methods, such as Figure 2 As shown, a grid-like rib structure is provided in the storage space below the mounting groove 121. The rib structure can enhance the overall structural strength, making the plastic part 12 more structurally strong.

[0041] In conjunction with the above embodiments, the plastic part 12 includes a supporting connecting surface 123, and a mounting groove 121 is disposed on the supporting connecting surface 123. The lower surface of the mounting groove 121 is higher than the supporting connecting surface 123 in the thickness direction Z. The plastic part 12 is generally a long strip structure, with a recessed supporting connecting surface 123 between its two sides. The mounting groove 121 is located on the supporting connecting surface 123. In this embodiment, by placing the bottom wall of the mounting groove 121 on the supporting connecting surface 123 and making the lower surface of the mounting groove 121 higher than the supporting connecting surface 123, it is possible to drain the electrolyte in the mounting groove 121 and avoid residual electrolyte in the mounting material.

[0042] Specifically, the bottom wall 1211 of the mounting groove 121 is higher than the supporting connection surface 123, which creates a stepped structure between the mounting groove 121 and the supporting connection surface 123. That is, a height difference is formed between the two in the thickness direction Z, which facilitates the rapid outflow of electrolyte in the mounting groove 121 and prevents electrolyte residue in the mounting groove 121.

[0043] It is understandable that the electrolyte may encounter flow resistance during the discharge process, resulting in incomplete discharge of the electrolyte in the surrounding gap. In this embodiment, by setting the support connection surface 123 lower than the lower surface of the mounting groove 121, the flow resistance during the electrolyte discharge process can be reduced, thereby facilitating the rapid and complete discharge of the electrolyte.

[0044] In some embodiments, a support structure is provided on the outer side of the sidewall of the mounting groove 121 where the notch 122 is provided. The support structure is used to strengthen the structural strength of the plastic part 12. The notch 122 weakens the overall structural strength of the plastic part 12, which may affect the service life of the battery cell 2. In this embodiment, the support structure ensures that the plastic part 12 has sufficient structural strength.

[0045] Specifically, a notch 122 is made in the side wall of the mounting groove 121. This may lead to a decrease in the strength of the side wall with the notch 122, thus creating a weak point in the plastic part 12 and reducing the service life of the battery cell 2. In this embodiment, the support structure can strengthen the structural strength of the side wall and avoid the appearance of weak points in the side wall.

[0046] The supporting structure can take various forms, as long as it effectively strengthens the structural strength of the sidewall. For example, the supporting structure could involve adding a thickened layer on one side of the sidewall to increase its structural strength, or it could employ reinforcing ribs for support.

[0047] In conjunction with the above embodiments, such as Figures 3-5As shown, the support structure includes a raised reinforcing rib 14, which extends from the notch 122 along the length X of the plastic part 12. The notch 122 reduces the structural strength of the sidewall of the mounting groove 121. This embodiment improves the structural strength of the sidewall by providing a reinforcing rib 14 at the notch 122.

[0048] Specifically, the reinforcing rib 14 is constructed with an oblique orientation, and its reinforcing rib 14 can provide support for the sidewall of the mounting groove 121, thereby strengthening the structural strength of the sidewall and improving the overall structural strength of the plastic part 12. For example... Figure 3 As shown, the reinforcing rib 14 has an inclined slope structure, which can improve the support effect of the reinforcing rib 14 and achieve stable support.

[0049] In specific implementation methods, such as Figure 2 , Figure 4 As shown, the width h2 of the reinforcing rib 14 in the width direction Y is 1-3 mm, and the maximum extension length h1 of the reinforcing rib 14 in the length direction X is 0.5-2 mm. The size of the reinforcing rib 14 affects the overall manufacturing difficulty, manufacturing cost, and reinforcement effect of the plastic part 12. In this embodiment, by limiting the size, the stress on the structure can be effectively dispersed and transferred, avoiding excessive local stress concentration.

[0050] Specifically, if the overall size of the reinforcing rib 14 is set too large, it will affect the overall molding of the plastic part 12 and increase the manufacturing cost and quality of the plastic part 12. In this embodiment, by limiting the width of the reinforcing rib and its extension length in the longitudinal direction X, both manufacturing cost and overall structural strength can be considered. For example, the width of the reinforcing rib 14 is selected as 2mm, and the corresponding length of the reinforcing rib 14 is set to 1.2mm. Under this limited structural size, the reinforcing rib 14 can improve the structural strength of the sidewall, and the overall size will not affect the manufacturing difficulty and cost.

[0051] In specific settings, such as Figure 3 , Figure 4 As shown, notches 122 are provided on both sides of the first sidewall 1212, and a reinforcing rib 14 structure is provided at each notch 122 position. The reinforcing rib 14 structure can enhance the structural strength at the notch 122 position.

[0052] In another embodiment of the support structure, such as Figure 6 As shown, the support structure includes a raised reinforcing rib 14 plate, which extends from the notch 122 and is biased towards the central axis of the plastic part 12 in the length direction X. Compared to a smaller reinforcing rib 14 structure, the reinforcing rib 14 plate can provide higher structural strength. In this embodiment, the overall structural strength of the plastic part 12 is higher through the setting of the reinforcing rib 14 plate.

[0053] Specifically, the reinforcing rib 14 protrudes vertically from the supporting connection surface 123 of the plastic part 12, and the extending direction of the reinforcing rib 14 extends towards the middle position, thereby improving the structural strength of the sidewall. For example... Figure 6 As shown, notches 122 are provided on both sides of the first sidewall 1212. The reinforcing rib 14 plate extends from the notch 122 position toward the central axis and finally converges at the middle position, thus forming a triangular reinforcing rib 14 plate connection structure, which strengthens the structural strength of the sidewall and improves the overall structural strength of the plastic part 12.

[0054] Continue as Figure 6 As shown, a grid-like reinforcing rib structure 14 is provided in the lower region of the mounting groove 121. A central rib strip 124 is located at the central axis of the plastic part 12. The two reinforcing rib plates 14 at the notch 122 are both biased towards the central rib strip 124 and connect with it to form a triangular support structure. This design improves structural strength and, because the reinforcing rib plates 14 are biased towards the center, they do not obstruct the electrolyte flowing out of the notch 122, allowing for smoother electrolyte flow.

[0055] In a specific embodiment, the upper surface of the reinforcing rib 14 plate is flush with the upper surface of the sidewall with the notch 122. This flushing facilitates the forming of the reinforcing rib 14 plate and reduces the difficulty of forming.

[0056] It is understood that the plastic part 12 is a plastic molded part as a whole. In this embodiment, by limiting the positional relationship between the upper surface of the reinforcing rib 14 plate and the upper surface of the side wall, the mold design and complexity can be simplified and the manufacturing difficulty can be reduced.

[0057] In conjunction with the above embodiments, the width W of the notch 122 in the width direction Y is 0.8-2 mm. The notch 122 affects the overall structural strength and the electrolyte flow rate. In this embodiment, by limiting the notch 122 to between 0.8-2 mm, both structural strength and electrolyte flow rate can be balanced.

[0058] Specifically, if the notch 122 is too wide, it will affect the overall structural strength; if it is too narrow, it will affect the flow of the electrolyte. In this embodiment, this limitation balances overall structural strength and electrolyte flow rate, preventing electrolyte accumulation. For example, in a specific application, the width W of the notch 122 is 1.2 mm. At this width, the notch 122 occupies a small proportion of the entire sidewall, thus having a limited impact on structural strength, and the electrolyte can quickly flow out from the notch 122.

[0059] like Figure 1As shown, a second aspect of this utility model provides a battery cell 2, including the battery cell cover plate 1 provided in any of the above embodiments. The battery cell 2 includes a housing, an electrode assembly, an electrolyte, a bare battery cell 2 insulating sheet, and the battery cell cover plate 1, wherein the battery cell cover plate 1 is the battery cell cover plate 1 provided in the above embodiments.

[0060] Specifically, the battery cell 2 provided in this example has the battery cell cover plate 1 structure of any of the aforementioned embodiments. Therefore, the battery cell 2 in this embodiment has the characteristic effects of each of the aforementioned battery cell cover plate 1 structures. To avoid redundancy in the effect description, it will not be repeated here.

[0061] Through the above description of the embodiments, those skilled in the art can clearly understand that by providing a notch 122 on one side wall of the mounting groove 121, the electrolyte accumulated in the surrounding gap can be discharged in a timely manner, avoiding safety hazards such as short circuits caused by prolonged electrolyte accumulation and electrode base plate. Furthermore, by providing a reinforcing rib 14 structure on the outer side of the side wall where the notch 122 is located, the structural strength of the side wall can be enhanced, resulting in higher overall structural strength of the plastic part 12.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell cover plate, characterized in that, include: The cover plate body, the pole base plate, and the plastic part; the plastic part is disposed on the cover plate body, and an installation groove is formed in the plastic part. The pole base plate is disposed in the installation groove, and there is a circumferential gap between the outer contour surface of the pole base plate and the installation groove. The mounting groove has at least one notch on its side wall along its length, and the notch communicates with the surrounding gap.

2. The cell cover plate according to claim 1, characterized in that, The mounting groove has a support structure on the outer side of the side wall with the notch, and the support structure is used to strengthen the structural strength of the plastic part.

3. The cell cover plate according to claim 2, characterized in that, The support structure includes raised reinforcing ribs, which extend from the notch location along the length of the plastic part.

4. The cell cover plate according to claim 3, characterized in that, The width of the reinforcing rib in the width direction is 1-3mm, and the maximum extension length of the reinforcing rib in the length direction is 0.5-2mm.

5. The cell cover plate according to claim 2, characterized in that, The support structure includes a raised reinforcing rib, which extends from the notch location and is biased toward the central axis of the plastic part in the length direction.

6. The cell cover plate according to claim 4, characterized in that, The upper surface of the reinforcing rib is flush with the upper surface of the sidewall with the notch.

7. The cell cover plate according to claim 1, characterized in that, The width of the notch in the width direction is 0.8-2mm.

8. The cell cover plate according to claim 1, characterized in that, The mounting groove includes a bottom wall, a first side wall, a second side wall, a third side wall, and a fourth side wall. The bottom wall forms the lower surface of the mounting groove, and the first side wall, the second side wall, the third side wall, and the fourth side wall sequentially enclose and form the circumferential surface of the mounting groove. The notch is provided at the end of the first sidewall adjacent to the second sidewall and at the other end of the first sidewall adjacent to the fourth sidewall.

9. The cell cover plate according to claim 8, characterized in that, The plastic part includes a supporting connecting surface, the mounting groove is disposed on the supporting connecting surface, and the lower surface of the mounting groove is higher than the supporting connecting surface of the plastic part in the thickness direction.

10. A battery cell, characterized in that, Includes the cell cover plate as described in any one of claims 1-9.

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