Cell cover and battery

Abstract

This utility model relates to the field of battery technology and discloses a cell cover plate and a battery containing the same. The cell cover plate includes a cover plate body, an explosion-proof valve, a protective cover, and a patch; the cover plate body has an explosion-proof hole and an injection hole, and a groove is provided on one end face; the explosion-proof valve is located in the explosion-proof hole; the protective cover has a connecting part and a protective part, the connecting part has the same projection shape as the groove and is embedded in the groove, the protective part covers the explosion-proof hole and has vent holes on its side wall; the patch covers and seals the other end face of the protective part. Through the coordinated design of the protective cover and the groove, reliable shielding of the explosion-proof hole and electrolyte buffering are achieved, preventing liquid from directly contacting the explosion-proof valve during injection; the cylindrical structure of the protective cover combined with the vent hole design ensures venting function and physically isolates liquid infiltration. This structure is optimized in three aspects: liquid prevention, venting, and pressure relief, significantly improving the protection level of the explosion-proof valve, avoiding electrolyte corrosion, extending battery life, and improving safety and reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to cell cover plates and batteries. Background Technology

[0002] In the field of battery technology, the cell cover is a key component of the battery, undertaking multiple functions such as current transmission, encapsulating the internal structure of the battery, and realizing electrical connections. Its performance and quality directly affect the overall performance and service life of the battery.

[0003] However, existing cell cover plates still face many technical challenges in design and practical application. During the electrolyte filling process, due to the large injection pressure, speed, and volume, electrolyte inevitably flows out from the top of the injection hole. Since the explosion-proof valve is close to the injection port, it is inevitably contaminated by the electrolyte, corroded, and its pressure relief performance is affected.

[0004] Therefore, it is necessary to provide an innovative cell cover and battery solution to address the aforementioned technical problems. Utility Model Content

[0005] Therefore, it is necessary to provide cell covers and batteries to address the technical problem that electrolyte easily contaminates the explosion-proof valve during the injection of electrolyte into existing cell covers, leading to a decrease in pressure relief performance. This would effectively protect the explosion-proof valve, prevent electrolyte corrosion, and improve battery safety and lifespan.

[0006] The first aspect of this utility model provides a battery cell cover plate, including a cover plate body, an explosion-proof valve, a protective cover, and a patch; the cover plate body has an explosion-proof hole and an injection hole, and a settling groove is provided on one end face; the explosion-proof valve is disposed in the explosion-proof hole; the protective cover has a connecting part and a protective part, the connecting part has the same projection shape as the settling groove and is embedded in the settling groove, the protective part covers the explosion-proof hole and has a vent hole on its side wall; the patch covers and seals the other end face of the protective part, and the patch is configured to detach from the protective cover under a preset pressure impact, the preset pressure being ≥0.3MPa.

[0007] Through the coordinated design of the protective cover and the settling tank, reliable shielding of the explosion-proof hole and buffering of electrolyte are achieved, preventing liquid from directly flowing into the explosion-proof valve during injection. The settling tank provides a precise positioning reference for the protective cover, ensuring its concentricity with the explosion-proof hole and preventing seal failure due to installation deviation. The cylindrical structure of the protective cover, combined with the vent design, ensures the venting function of the explosion-proof valve while preventing liquid from seeping in through the vents through physical isolation. The patch seals the protective part during normal operation and ruptures to release pressure under abnormal pressure. Its material and thickness design (0.2-1mm) balances sealing performance and fragility, ensuring reliable opening under pressures above 0.3MPa. This structure, through synergistic optimization of liquid prevention, venting, and pressure relief, significantly improves the protection level of the explosion-proof valve and the overall safety of the battery.

[0008] In other embodiments, a groove surrounding the explosion-proof hole is formed on the first end face of the cover body. The connecting part of the protective cover is adapted to the shape of the groove and embedded in the groove. One end face of the protective part in the thickness direction is connected to the connecting part.

[0009] The surrounding design of the settling tank forms a liquid buffer zone, preventing the electrolyte from directly contacting the edge of the explosion-proof hole during liquid injection and reducing the risk of liquid seepage. The fitting and embedding of the connecting part with the settling tank ensures the fixing strength of the protective cover, and the seal is achieved by laser welding or bonding to prevent liquid from entering from the gaps in the contact surface. The integrated structure of the protective part and the connecting part simplifies the assembly process, reduces manufacturing costs, and avoids the assembly gaps that may exist in the split design, thereby improving the reliability of the seal.

[0010] In other embodiments, the depth of the sink is the same as the thickness of the connecting part, which is 0.3-1mm thick. By controlling the thickness of the connecting part (preferably 0.5mm), a lightweight design is achieved while ensuring structural strength, avoiding deformation or detachment due to insufficient thickness, or increasing the weight of the cover plate due to excessive thickness. The consistency between the depth of the sink and the thickness of the connecting part ensures uniform energy transfer during welding or bonding, forming a stable bonding layer and improving sealing and durability.

[0011] In other embodiments, the sidewall thickness of the protective part is 0.5-1.5mm to balance the structural strength and space utilization of the protective part, avoiding deformation due to the sidewall being too thin (<0.5mm) affecting the patch sealing, or being too thick (>1.5mm) occupying the internal space of the battery; the sidewall can be designed with reinforcing ribs (such as longitudinal or transverse ribs) to further improve the deformation resistance and ensure a tight fit between the patch and the protective part.

[0012] In other embodiments, at least one electrode post is provided on the cover plate body. The electrode post serves as a connection component between the battery and the external circuit and undertakes the function of current transmission. Its number and layout (such as positive and negative electrode design) need to match the requirements of the battery module to ensure the reliability and efficiency of the electrical connection.

[0013] In other embodiments, the height of the electrode post extending out of the end face of the cover plate body is h3, and the sum of the heights of the protective part and the patch is h2, and h2≤h3. The overall compactness of the cell cover plate is ensured by the height relationship design (h2≤h3), and the protective part and the patch protrude and interfere with the assembly of the battery module. Preferably, h3 is 5-10mm and h2 is 3-8mm, which not only meets the protection requirements, but also facilitates battery stacking and fixing, and improves space utilization.

[0014] In other embodiments, the patch and the protective part are fixed by adhesive, which achieves a reliable seal between the patch and the protective part, and facilitates rapid peeling of the patch under abnormal pressure; a weak adhesive or hot melt adhesive (adhesive strength 0.1-0.5 N / mm) is used. 2This ensures reliable detachment of the patch under pressures above 0.3 MPa, balancing sealing performance with durability.

[0015] In other embodiments, the patch thickness is 0.2-1mm. The burst pressure is controlled by the thickness design to avoid accidental rupture due to excessive thinness (<0.2mm) or delayed pressure release due to excessive thickness (>1mm). Preferably, the thickness is 0.5mm, which can meet the burst pressure requirements (above 0.3MPa), control material costs, and ensure consistent burst pressure due to thickness uniformity (±0.02mm).

[0016] In other embodiments, the explosion-proof hole has an elongated oval structure with its long axis arranged along the width direction. The elongated oval structure improves the flexibility of the explosion-proof hole arrangement, allowing the long axis of the oval to face or face away from the injection hole, adapting to different spatial layout requirements. When the long axis of the oval is arranged along the width direction, the coordinated design of the protective cover and the settling tank can still prevent a large amount of electrolyte from seeping in, breaking through the limitation in traditional designs that the long axis of the explosion-proof hole must face the injection hole, and improving design freedom.

[0017] The second aspect of this utility model provides a battery including the aforementioned cell cover. By adopting a cell cover with multiple protection designs, the safety and reliability of the battery are significantly improved. The coordinated design of the protective cover and the sink prevents electrolyte contamination of the explosion-proof valve, the pressure relief function of the patch prevents abnormal pressure accumulation, and the optimized layout of the electrode posts improves electrical connection efficiency. This battery adapts to the needs of modules of different models and layouts, extends service life, reduces safety hazards such as thermal runaway, and enhances market competitiveness. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the cover plate body of this application.

[0019] Figure 2 This is an exploded view of the cover plate body of this application.

[0020] Figure 3 This is a top view of the cover plate body of this application.

[0021] Figure 4 for Figure 3 A sectional view along line A.

[0022] Figure 5 for Figure 4 A magnified view of part B in the middle.

[0023] Figure 6 This is a three-dimensional structural diagram of the protective cover in this application.

[0024] Figure label:

[0025] 100. Cover plate body; 101. Explosion-proof hole; 102. Liquid injection hole; 103. Settling tank; 200. Explosion-proof valve; 300. Protective cover; 301. Connecting part; 302. Protective part; 3021. Vent hole; 400. Patch; 500. Electrode post. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via 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 that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] Example 1

[0033] like Figures 1-6 As shown, the cell cover plate of this embodiment includes a cover plate body 100, an explosion-proof valve 200, a protective cover 300, and a patch 400. Through the collaborative design of multiple components, the cell cover plate of this embodiment achieves reliable protection of the explosion-proof valve 200 and improves the overall safety of the battery.

[0034] The structure, function, and synergistic effect of each component are described in detail below.

[0035] like Figures 1-5As shown, in this embodiment, the cover plate body 100 is defined in the length direction, width direction, and thickness direction. A first end face S1 and a second end face are defined in the thickness direction of the cover plate body 100. In this embodiment, the first end face S1 is the end face of the cover plate body 100 facing away from the battery cell. An explosion-proof hole 101 and a liquid injection hole 102 are formed in the thickness direction of the cover plate body 100. The explosion-proof hole 101 and the liquid injection hole 102 are spaced apart in the length direction. The explosion-proof hole 101 is long... The circular structure, or racetrack-shaped structure, with the long oval axis arranged along the width direction, means that the wider side of the explosion-proof hole 101 is opposite to the injection hole 102. In this case, liquid can easily enter the explosion-proof valve 200 from the explosion-proof hole 101. Therefore, in related technologies, the long oval axis of the long oval explosion-proof hole 101 is usually oriented towards the injection hole 102, and the shorter side of the explosion-proof hole 101 is opposite to the injection hole 102. In this way, even if liquid seeps into the explosion-proof hole 101, the amount will not be too large. However, this design limits the flexibility of the arrangement of the explosion-proof holes 101. For example, it may not meet the requirements when space is limited or the assembly angle needs to be adjusted. Moreover, the long axis of the explosion-proof holes 101 is set along the width direction, which is just right to match the fact that the battery casing expands mainly along the width direction when the internal pressure is too high, which can accelerate the venting efficiency of the explosion-proof valve. However, the arrangement method in the related technology is not conducive to the venting of the explosion-proof valve. Therefore, this application can reduce the penetration of electrolyte into the explosion-proof holes 101 under the optimal arrangement of the explosion-proof valve.

[0036] In this embodiment, the coordinated design of the protective cover 300 and the sink 103 allows for both the long axis and short axis of the elongated oval shape to face the injection hole 102, improving assembly adaptability. Furthermore, according to this application, the arrangement of the explosion-proof hole 101 and the injection hole 102 is not limited; the explosion-proof hole 101 can also be inclined in the length or width direction, further enhancing design freedom. This flexibility allows the cell cover to adapt to the needs of battery modules of different models and layouts.

[0037] In this embodiment, a groove 103 surrounding the explosion-proof hole 101 is provided on the first end face S1 of the cover plate body 100. In this embodiment, there are at least two ways of surrounding the explosion-proof hole 101. One is that the groove 103 and the explosion-proof hole 101 have overlapping parts, that is, the inner edge of the groove 103 and the outer edge of the explosion-proof hole 101 overlap. The other is that the groove 103 and the explosion-proof valve 101 are spaced apart. After the protective cover 300 is connected to the groove 103, it will also be separated from the explosion-proof hole 101, which can also prevent the electrolyte from penetrating into the explosion-proof hole 101.

[0038] Theoretically speaking, as long as the inner edge of the sink 103 is the same as the outer edge of the explosion-proof hole 101, there will be a step on the end face of the explosion-proof hole 101 in the thickness direction. This step groove is also the installation position of the subsequent protective cover 300. The design of the settling groove 103 serves multiple purposes: First, it provides a precise positioning reference for the protective cover 300, ensuring the concentricity of the protective cover 300 and the explosion-proof hole 101, and preventing the protective cover 300 from obstructing the explosion-proof hole 101 or causing sealing failure due to installation deviations; Second, this step (settling groove 103) can prevent liquid from directly entering the explosion-proof hole 101 during injection, at least buffering the liquid and providing a short-term retention space to prevent the liquid from rushing into the explosion-proof valve 200 and causing false triggering or corrosion of the internal structure of the explosion-proof valve 200; Third, the depth and width of the settling groove 103 must match the dimensions of the connecting part 301 of the protective cover 300 to ensure the strength of welding or bonding. For example, if the depth of the settling groove 103 is too shallow, the protective cover 300 may not be firmly fixed, while if the depth is too deep, it may increase the processing difficulty and material cost of the cover body 100.

[0039] In this embodiment, the end face of the sink 103 is parallel to the end face of the cover body 100 along the thickness direction, facilitating subsequent welding and fixing with the protective cover 300. The parallel end face design simplifies the welding process; for example, laser welding or ultrasonic welding can be used, achieving efficient and precise connection through automated equipment. During welding, laser or ultrasonic energy is concentrated on the contact surface between the end face of the sink 103 and the connection portion 301 of the protective cover 300, forming a fused bonding layer to ensure sealing and structural strength. Furthermore, the parallel end face design facilitates subsequent quality inspection, such as visual inspection or ultrasonic flaw detection to verify welding quality, avoiding problems like incomplete or missed welds caused by uneven end faces.

[0040] In other embodiments, along the thickness direction, the end face of the sink 103 is not parallel to the end face of the cover body 100, and there is a height difference between the inner and outer edges of the sink 103, with the inner edge being higher than the outer edge. In this case, the protective cover 300 also needs to be structurally matched accordingly. The advantage of this design is that even if some liquid seeps in along the inner wall of the sink 103, it will be retained in the sink 103 and will not directly enter the explosion-proof hole 101. The non-parallel end face design forms a liquid guiding channel through the height difference. For example, when the inner edge is higher than the outer edge, the liquid will flow out of the sink 103 along the outer edge under the action of gravity, rather than flowing inward into the explosion-proof hole 101. This design is particularly suitable for use scenarios with high humidity or easily splashed liquids, such as when electric vehicles are driven or washed in the rain, the battery cell cover may come into contact with a large amount of liquid. In this case, the guiding channel can effectively prevent liquid accumulation and penetration.

[0041] In this embodiment, the explosion-proof valve 200 is directly embedded in the explosion-proof hole 101, and is fixed and sealed by interference fit or sealing ring.

[0042] like Figure 5 and Figure 6 As shown, the protective cover 300 in this embodiment has a cylindrical structure, and one open end of the protective cover 300 is disposed on the first end face S1 and covers the explosion-proof hole 101.

[0043] Specifically, the protective cover 300 has a connecting part 301 and a protective part 302. The connecting part 301 is adapted to the shape of the sink 103 and is embedded in the sink 103. One end face of the protective part 302 in the thickness direction is connected to the connecting part 301. The projection shape of the connecting part 301 and the sink 103 in the thickness direction is the same, which can just achieve the fitting and fixing of the connecting part 301 into the sink 103. Theoretically, in the thickness direction, the outer edge contour of the projection of the connecting part 301 should be the same as the outer edge contour of the projection of the sink 103. The inner edge of the connecting part 301 can extend beyond the range of the sink 103 in the plane (formed by the length and width directions). However, this design will also limit the air permeability of the explosion-proof valve 200. Therefore, in this application, the connecting part 301 is designed to be more flexible and adaptable to the sink 103. The projection of the 01 and the settling tank 103 in the thickness direction is the same, which does not restrict the venting effect of the explosion-proof valve 200. The connecting part 301 is embedded in the settling tank 103. The protective part 302 has at least one vent 3021 on the side wall opposite to the injection hole 102, which communicates with the explosion-proof hole 101. The main function of the vent 3021 is to facilitate the venting of the explosion-proof valve 200. However, in this application, due to its special installation position, it can prevent the liquid in the injection hole 102 from entering the explosion-proof valve 200 through the vent 3021. The shape, number and distribution of the vent 3021 need to be comprehensively designed according to the venting requirements of the explosion-proof valve 200 and the strength of the protective cover 300. For example, a circular hole with a diameter of 0.2-0.5 mm and a hole spacing of 1-2 mm can be used to ensure sufficient venting area and prevent foreign objects from entering or liquid from seeping in. Furthermore, the vent 3021 can be designed as a conical or labyrinth structure, such as a conical vent with a smaller inner diameter and a larger outer diameter, to further enhance liquid resistance while reducing the impact on exhaust efficiency.

[0044] like Figures 1-3As shown, in this embodiment, the patch 400 is connected to the protective cover 300 and seals the other opening of the protective cover 300. The patch 400 is configured to detach from the protective cover 300 under a preset pressure impact, the preset pressure being above 0.3 MPa. The functions of the patch 400 are: firstly, when the battery is operating normally, the patch 400 covers the vent 3021 of the protective part 302, preventing dust, moisture, etc., from entering the explosion-proof valve 200; secondly, when the internal pressure of the battery abnormally increases, the patch 400 is ruptured, releasing gas. The material of the patch 400 needs to be selected according to the burst pressure, for example, using low-strength polyethylene (PE) or polypropylene (PP) film with a thickness of 0.2-1 mm, which can withstand normal pressure and rupture rapidly under abnormal pressure. The connection method between the patch 400 and the protective part 302 needs to balance sealing and fragility, for example, using a weak adhesive or hot melt adhesive, with the bonding strength controlled at 0.1-0.5 N / mm. 2 This ensures that patch 400 can reliably detach when the pressure reaches above 0.3MPa.

[0045] This allows the protective part 302 to be covered, and the patch 400 is connected to the protective part 302 by adhesive. The two are connected by adhesive, and under certain pressure, the patch 400 can be blown open to improve the venting efficiency.

[0046] In the thickness direction, the height of the groove 103 is the same as the thickness of the connecting part 301, and the thickness of the connecting part 301 is d1, satisfying 0.3mm≤h1≤1mm. Matching the height of the groove 103 with the thickness of the connecting part 301 is crucial to ensuring welding or bonding strength: if h1 is too small (e.g., <0.3mm), the connecting part 301 may deform or detach due to insufficient strength; if h1 is too large (e.g., >1mm), it may increase the weight and cost of the cover plate body 100, while reducing assembly efficiency. In this embodiment, h1 is preferably 0.5mm, which satisfies both strength requirements and lightweight design. Furthermore, the thickness uniformity of the connecting part 301 needs to be controlled within ±0.05mm to avoid weak welding or sealing failure due to thickness deviation.

[0047] In this embodiment, the sidewall thickness of the protective part 302 in the length or width direction is d, and satisfies: 0.5mm ≤ d ≤ 1.5mm. The design of the sidewall thickness of the protective part 302 needs to balance structural strength and ventilation requirements: if d is too small (e.g., <0.5mm), the protective part 302 may deform due to insufficient strength, resulting in the patch 400 not being able to fit tightly; if d is too large (e.g., >1.5mm), it may occupy too much space, affecting the internal layout of the battery. In this embodiment, d is preferably 1mm, which can provide sufficient support and leave enough bonding area for the patch 400. In addition, the sidewall of the protective part 302 can be designed as a reinforcing rib structure, for example, longitudinal or transverse reinforcing ribs are set inside the sidewall to further improve the deformation resistance.

[0048] In this embodiment, in order to ensure that there are sufficient dimensions to provide for the adhesion of the patch 400, the sidewall thickness of the protective part 302 is uniform in the length direction, the width direction, and the transition area between the length and width directions. At this time, the sidewall thickness in the length direction or the width direction is the sidewall thickness on the plane (composed of the length direction and the width direction).

[0049] In this embodiment, at least one electrode post 500 is connected to the cover plate body 100 along the thickness direction, and the electrode post 500 extends out of the end face of the cover plate body 100. The electrode post 500 is a component that connects the battery to an external circuit.

[0050] In this embodiment, along the thickness direction, the height of the portion of the electrode post 500 extending beyond the end face of the cover body 100 is h3, and the sum of the heights of the protective part 302 and the patch 400 is h2, where h2 ≤ h3. This height relationship design ensures the overall compactness of the cell cover: if h2 > h3, the protective part 302 and the patch 400 may protrude beyond the electrode post 500, causing interference with other components during installation; if h2 ≤ h3, it ensures that all components are located on the same plane or below the electrode post 500, facilitating the stacking and fixing of the battery module. In this embodiment, h3 is preferably 5-10 mm, and h2 is preferably 3-8 mm, satisfying both protection requirements and assembly efficiency. Furthermore, a protective cover can be provided around the electrode post 500 to prevent foreign objects from contacting the post and causing a short circuit.

[0051] In this embodiment, the thickness h4 of the patch 400 along the thickness direction satisfies 0.2mm ≤ h4 ≤ 1mm. The design of the patch 400 thickness needs to balance the burst pressure and processing cost: if h4 is too small (e.g., <0.2mm), the patch 400 may break under normal pressure due to insufficient strength; if h4 is too large (e.g., >1mm), it may increase the burst pressure, causing the explosion-proof valve 200 to fail to open in time. In this embodiment, h4 is preferably 0.5mm, which can meet the burst pressure requirements (e.g., above 0.3MPa) while controlling material costs. Furthermore, the thickness uniformity of the patch 400 needs to be controlled within ±0.02mm to avoid inconsistent burst pressure due to thickness deviation.

[0052] In this embodiment, the protective part 302 and the connecting part 301 are an integral structure. This integral structure design is achieved through injection molding or stamping processes, simplifying the assembly process and reducing manufacturing costs, while still meeting the strength and sealing requirements of the protective part 302. Another advantage of the integral structure is that it avoids the assembly gaps that may exist in a split design, improving sealing and protective effectiveness.

[0053] Example 2

[0054] The battery of this embodiment includes the cell cover plate from Embodiment 1. By employing the cell cover plate from Embodiment 1, the battery of this embodiment significantly improves safety and reliability. Specific advantages have been detailed in Embodiment 1 and will not be repeated here.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An electrode cover plate, characterized by, include: The cover plate body is defined in length, width and thickness directions. A first end face and a second end face are defined in the thickness direction of the cover plate body. An explosion-proof hole and a liquid injection hole are formed in the thickness direction of the cover plate body. The explosion-proof hole and the liquid injection hole are spaced apart in the length direction. An explosion-proof valve is installed inside the explosion-proof hole; The protective cover has a cylindrical structure. One open end of the protective cover is located on the first end face and covers the explosion-proof hole. At least one vent hole is provided on the side wall of the protective cover away from the injection hole. A patch is attached to the protective cover and closes the other opening of the protective cover. The patch is configured to detach from the protective cover under a preset pressure impact.

2. The cell cover plate of claim 1, wherein, A groove surrounding the explosion-proof hole is provided on the first end face of the cover plate body; The protective cover has a connecting part and a protective part. The connecting part is adapted to the shape of the sink and is embedded in the sink. The protective part is connected to the connecting part on one end face along the thickness direction.

3. The cell cover plate of claim 2, wherein, In the thickness direction, the depth of the sink is the same as the thickness of the connecting part, the thickness of the connecting part is h1, and satisfies 0.3mm≤h1≤1mm.

4. The cell cover plate of claim 2, wherein, The thickness of the sidewall of the protective part is d, and it satisfies: 0.5mm≤d≤1.5mm.

5. The cell cover plate of any one of claims 2 or 3, wherein, At least one electrode post is provided on the cover plate body.

6. The cell cover plate of claim 5, wherein, Along the thickness direction, the height of the electrode post extending out of the end face of the cover plate body is h3, and the total height of the protective part and the patch along the thickness direction is h2, and satisfies: h2≤h3.

7. The cell cover plate of claim 1, wherein, The patch is bonded to the protective part with adhesive, and the preset pressure is ≥0.3MPa.

8. The cell cover plate of claim 1, wherein, Along the thickness direction, the thickness h4 of the patch satisfies 0.2mm≤h4≤1mm.

9. The cell cover plate of claim 8, wherein, The explosion-proof hole has an oblong structure, and the long axis of the oblong shape is arranged along the width direction.

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

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