Cover plate assembly

Abstract

This application relates to a cover plate assembly and a battery. The cover plate assembly is used to install on the battery casing and includes: a cover plate storage unit connected to the cover plate, the storage unit having a storage cavity and a replenishment hole, the storage cavity and the replenishment hole being interconnected; and a valve unit movably connected to the storage unit and capable of closing or opening the replenishment hole. When the valve unit opens the replenishment hole, electrolyte in the storage cavity can flow into the casing through the replenishment hole. Since the valve unit is movably connected to the storage unit and can close or open the replenishment hole, the valve unit closes the replenishment hole before replenishing electrolyte in the casing's accommodating cavity; when replenishment of electrolyte in the casing's accommodating cavity is required, the valve unit opens the replenishment hole, allowing electrolyte in the storage cavity to flow into the casing through the replenishment hole, thus achieving replenishment without causing irreversible damage to the cover plate assembly, achieving non-destructive replenishment and improving the convenience of battery replenishment.

Description

Technical Field

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

[0002] Batteries have extremely wide applications in various fields. In some battery usage scenarios, it is necessary to add electrolyte to the battery to extend its service life. However, for traditional batteries, it is usually necessary to damage the original structure of the battery to add electrolyte, which makes the electrolyte replenishment process time-consuming and laborious, and does not contribute to the convenience of battery electrolyte replenishment. Summary of the Invention

[0003] One of the technical problems addressed by this application is how to improve the convenience of fluid resuscitation.

[0004] A cover assembly for mounting on a battery casing, the cover assembly comprising:

[0005] cover plate

[0006] A storage unit, connected to the cover plate, wherein the storage unit has a storage cavity and a replenishment hole, and the storage cavity and the replenishment hole are interconnected; and

[0007] A valve unit is movably connected to the storage unit and can close or open the replenishment hole. When the valve unit opens the replenishment hole, the electrolyte in the storage chamber can flow into the housing through the replenishment hole.

[0008] In one embodiment, both the cover plate and the storage unit are provided with sliding holes, the sliding holes are connected to the storage cavity, and the valve unit is slidably engaged with the sliding holes to open the liquid replenishment hole.

[0009] In one embodiment, the valve unit includes a control valve and a sealing cover. The control valve is slidably engaged with the slide hole, and the sealing cover is connected to the cover plate and seals the slide hole. The sealing cover deforms under pressure and pushes the control valve to slide, so that the control valve is suspended on the sealing cover or the cover plate and opens the liquid replenishment hole.

[0010] In one embodiment, the control valve includes a sealing section, a sliding section, and an abutment section. The sliding section is connected between the sealing section and the abutment section. The sealing section opens or closes the fluid inlet. The sliding section slides in conjunction with the sliding hole. The abutment section protrudes from the side peripheral surface of the sliding section. When the sealing section closes the fluid inlet, the abutment section abuts against the sealing cover. When the sealing section opens the fluid inlet, the abutment section abuts against the cover plate and is located outside the sliding hole.

[0011] In one embodiment, the cover plate has a mounting surface for mounting the sealing cover, and when the sealing section covers the liquid replenishment hole, the abutting section is further away from the liquid replenishment hole relative to the mounting surface, and the distance between the abutting section and the mounting surface is 0.5 mm to 2 mm.

[0012] In one embodiment, a countersunk hole is recessed on the mounting surface, and a sliding hole is recessed on the bottom wall of the countersunk hole. The cross-section of the countersunk hole is larger than the cross-section of the sliding hole and the abutment section, and the abutment section can abut against the bottom wall of the countersunk hole.

[0013] In one embodiment, the sealing section includes a sealing portion and a connecting portion, the connecting portion being connected between the sealing portion and the sliding section. The cross-section of the sealing portion is larger than the cross-section of the connecting portion, and the cross-section of the connecting portion is larger than the cross-section of the sliding section. When the sealing portion blocks the liquid replenishment hole, the connecting portion is located inside the storage cavity and abuts against the storage unit.

[0014] In one embodiment, at least one of the following schemes is also included:

[0015] The connecting part has a hollow hole that extends through the connecting part along the thickness direction, and the hollow hole communicates with the storage cavity;

[0016] The end face of the sealing part away from the connecting part is an inclined surface; when the sealing part blocks the liquid replenishment hole, a portion of the inclined surface is located inside the storage cavity and abuts against the storage unit. From the end of the inclined surface located inside the storage cavity to the end located outside the storage cavity, the distance from the inclined surface to the connecting part gradually increases.

[0017] In one embodiment, at least one of the following schemes is also included:

[0018] The storage unit includes a storage component and a support component. The support component is located between the storage component and the cover plate. The storage cavity is formed on the storage component. The cover plate has mounting holes. The support component has multiple explosion-proof holes that communicate with the mounting holes. A flow cavity for communicating with the inner cavity of the housing is formed between the support component and the storage component. The flow cavity communicates with the explosion-proof holes.

[0019] The cover plate is also provided with a first injection hole and a second injection hole. The first injection hole is connected to the storage cavity, and the second injection hole is used to connect to the inner cavity of the housing.

[0020] A battery comprising the cover assembly described in any one of the above descriptions.

[0021] One technical advantage of one embodiment of this application is that, given that the valve unit is movably connected to the storage unit and can close or open the replenishment hole, the valve unit closes the replenishment hole before replenishment; when replenishment is needed, the valve unit opens the replenishment hole, and the electrolyte in the storage cavity can flow into the housing through the replenishment hole to achieve replenishment. In this way, there is no need to cause irreversible damage to the cover plate assembly, that is, non-destructive replenishment is achieved, improving the convenience of battery replenishment. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a cover plate assembly provided in one embodiment.

[0023] Figure 2 for Figure 1 The diagram shows a three-dimensional structure of the cover plate assembly from another perspective.

[0024] Figure 3 for Figure 1 The diagram shows a three-dimensional sectional view of the cover plate assembly.

[0025] Figure 4 An exploded view of the cover plate assembly provided in another embodiment.

[0026] Figure 5 for Figure 4 A three-dimensional sectional view of the structure.

[0027] Figure 6 for Figure 4 The exploded view of the cover plate assembly shown is from another perspective.

[0028] Figure 7 for Figure 4 A three-dimensional structural diagram of the control valve in the cover plate assembly shown.

[0029] Figure 8 for Figure 7 The control valve shown is a three-dimensional structural diagram from another perspective. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] See Figure 1 , Figure 2 , Figure 3 and Figure 4 One embodiment of this application provides a battery including a casing and a cover assembly 10. The inner cavity of the casing serves as a receiving cavity for housing the battery cell, i.e., the battery cell is housed within the receiving cavity. The cover assembly 10 is used to cover the casing, thereby protecting the receiving cavity. Before battery encapsulation, a certain amount of electrolyte needs to be injected into the receiving cavity so that the battery cell can function normally under the action of the electrolyte. Once the electrolyte is depleted, the entire battery will become unusable. The cover assembly 10 includes a cover plate 100, a storage unit 200, and a valve unit 300. The cover plate 100 can be stacked on top of the storage unit 200, and the valve unit 300 is movably connected to the cover plate 100 and the storage unit 200.

[0037] See Figure 3 , Figure 4 and Figure 5In some embodiments, the cover plate 100 may be made of aluminum, and the storage unit 200 may be made of plastic. The storage unit 200 may be formed in parts, for example, the storage unit 200 includes a storage component 210 and a support component 220. The storage component 210 and the support component 220 are formed independently before assembly. The separately formed storage component 210 and the support component 220 can be assembled by a fixed connection to form the storage unit 200. For example, the storage component 210 and the support component 220 can be assembled by a detachable connection such as bolts to form the storage unit 200. The support member 220 is located between the storage member 210 and the cover plate 100. The storage member 210 can have a storage cavity 211 and a replenishment hole 212. The replenishment hole 212 connects both the storage cavity 211 and the receiving cavity of the casing. The storage cavity 211 is used to temporarily store electrolyte. When the replenishment hole 212 is opened, the electrolyte in the storage cavity 211 is injected into the receiving cavity through the replenishment hole 212, thereby replenishing the battery's electrolyte. In fact, when the electrolyte in the receiving cavity of the casing is about to be depleted, the electrolyte in the storage cavity 211 can be injected into the receiving cavity through the replenishment hole 212 to replenish the battery's electrolyte. In other embodiments, the storage unit 200 can be integrally connected by a molding process, for example, the storage unit 200 can be integrally molded by injection molding.

[0038] See Figure 3 , Figure 4 and Figure 5In some embodiments, a first liquid injection hole 110 is provided on the cover plate 100, and a first liquid injection hole 110 can also be provided on the storage component 210. That is, the cover plate 100 and the storage component 210 are both provided with first liquid injection holes 110. The first liquid injection hole 110 on the cover plate 100 and the first liquid injection hole 110 on the storage component 210 can be coaxially arranged and interconnected. The first liquid injection hole 110 on the storage component 210 is interconnected with the storage cavity 211. A certain amount of electrolyte can be injected into the storage cavity 211 through the first liquid injection hole 110, so that the electrolyte approximately fills the storage cavity 211. For example, the storage cavity 211 can store more than 3 grams of electrolyte, so when the battery needs to be replenished, more than 3 grams of electrolyte can be added at one time. A second electrolyte injection hole 120 can also be provided on the cover plate 100. The second electrolyte injection hole 120 can be directly connected to the receiving cavity of the casing. Before the battery is packaged, a certain amount of electrolyte can be injected into the receiving cavity of the casing through the second electrolyte injection hole 120. In short, electrolyte is injected into the storage cavity 211 of the storage device 210 through the first electrolyte injection hole 110, and electrolyte is injected into the receiving cavity of the casing through the second electrolyte injection hole 120. After the electrolyte injection is completed, the first electrolyte injection hole 110 and the second electrolyte injection hole 120 need to be permanently sealed to prevent electrolyte from leaking out of the first electrolyte injection hole 110 and the second electrolyte injection hole 120, and also to prevent external dust and liquid from entering the storage cavity 211 and the receiving cavity through the first electrolyte injection hole 110 and the second electrolyte injection hole 120.

[0039] See Figure 3 , Figure 4 and Figure 5 In some embodiments, the cover plate 100 has mounting holes 130 that extend through the entire cover plate 100 along its thickness direction. The support member 220 has multiple explosion-proof holes 221 that extend through the entire support member 220 along its thickness direction and communicate with the mounting holes 130. When the support member 220 is approximately rectangular, the multiple explosion-proof holes 221 are arranged in a matrix on the support member 220; when the support member 220 is approximately circular, the multiple explosion-proof holes 221 can be arranged on multiple concentrically arranged circumferences. A flow cavity 230 is formed between the support member 220 and the storage member 210, and the flow cavity 230 simultaneously communicates with the receiving cavity of the housing and the explosion-proof holes 221 of the support member. An explosion-proof valve can be installed in the mounting hole 130 of the cover plate 100. When the pressure inside the housing cavity is too high, the pressure will be transmitted to the explosion-proof valve located at the mounting hole 130 through the flow cavity 230 and the explosion-proof hole 221. The explosion-proof valve will open under the pressure, thereby relieving the pressure inside the housing cavity.

[0040] In some embodiments, both the cover plate 100 and the storage unit 210 are provided with sliding holes 140, which communicate with the storage cavity 211. The valve unit 300 is slidably engaged with the sliding holes 140 to open the replenishment hole 212. In other embodiments, the valve unit 300 can be rotatably connected to the cover plate 100 and the storage unit 200, and the replenishment hole 212 can be opened after the valve unit 300 rotates a certain angle.

[0041] See Figure 5 , Figure 6 , Figure 7 and Figure 8 The valve unit 300 includes a control valve 301 and a sealing cover 302. The sealing cover 302 is approximately hemispherical and possesses a certain degree of rigidity and toughness, allowing it to deform under pressure. The sealing cover 302 is fixed to the cover plate 100 by welding. The sealing cover 302 seals the sliding hole 140 and the control valve 301, preventing them from being exposed outside the cover plate 100 and preventing dust and liquid from entering the sliding hole 140. The control valve 301 slides within the sliding hole 140, meaning it can slide up and down relative to the hole. While the control valve 301 and the sealing cover 302 abut against each other, they are not necessarily fixedly connected, allowing the control valve 301 to move within the sliding hole 140 and disengage from the sealing cover 302. Before replenishing the electrolyte, the end of the control valve 301 can abut against the sealing cover 302, blocking the replenishment hole 212 so that the electrolyte in the storage chamber 211 cannot enter the receiving chamber through the replenishment hole 212 for replenishment. When the battery needs to be replenished, a downward pressing force can be applied to the sealing cover 302, causing the sealing cover 302 to deform and push the control valve 301 to slide downward relative to the sliding hole 140 to open the replenishment hole 212. At this time, the electrolyte in the storage chamber 211 will flow into the receiving chamber through the replenishment hole 212 to achieve replenishment. When the control valve 301 opens the replenishment hole 212, the control valve 301 does not fall into the receiving cavity. For example, the control valve 301 can abut against the cover plate 100 and be suspended on the cover plate 100. Alternatively, a flexible rope can be connected between the control valve 301 and the sealing cover 302, and the control valve 301 can be suspended on the sealing cover 302 through the flexible rope.

[0042] See Figure 3 , Figure 5 and Figure 7In some embodiments, the control valve 301 includes a sealing section 310, a sliding section 320, and an abutment section 330. One end of the sliding section 320 is connected to the sealing section 310, and the other end of the sliding section 320 is connected to the abutment section 330, such that the sliding section 320 is connected between the sealing section 310 and the abutment section 330. The sliding section 320 is slidably engaged with the sliding hole 140. A sealing ring can be provided inside the sliding hole 140, and the sealing ring is fitted onto the sliding end. The sealing ring can effectively seal the sliding hole 140, preventing the electrolyte in the storage chamber 211 from entering the sliding hole 140. The sealing section 310 opens or opens the replenishment hole 212. When the sliding section 320 slides downward relative to the sliding hole 140, the sealing section 310 opens the replenishment hole 212. The cross-sections of both the abutting section 330 and the sliding section 320 can be approximately circular. The length of the sliding section 320 is greater than the length of the abutting section 330, making the sliding section 320 cylindrical, while the abutting section 330 is disc-shaped. The cross-section of the abutting section 330 is greater than the cross-section of the sliding section 320. The central axes of the abutting section 330 and the sliding section 320 can coincide, thus making a portion of the abutting section 330 protrude relative to the side circumference of the sliding section 320. The cross-section of the sliding section 320 can be approximately equal to the cross-section of the sliding hole 140, while the cross-section of the abutting section 330 is larger than the cross-section of the sliding hole 140. When the sliding section 320 slides downward and the sealing section 310 opens the liquid replenishment hole 212, the abutting section 330 will abut against the cover plate 100 and will not be able to enter the sliding hole 140. That is, the abutting section 330 is located outside the sliding hole 140. The part of the abutting section 330 that protrudes relative to the sliding section 320 will abut against the cover plate 100, so that the abutting section 330 abuts against the cover plate 100 to ensure that the entire control valve 301 is suspended on the cover plate 100, preventing the control valve 301 from falling into the receiving cavity.

[0043] See Figure 3 , Figure 5 and Figure 7In some embodiments, the sealing section 310 includes a sealing portion 311 and a connecting portion 312. One end of the connecting portion 312 is connected to the sealing portion 311, and the other end of the connecting portion 312 is connected to the sliding section 320, such that the connecting portion 312 connects the sealing portion 311 and the sliding section 320. The cross-section of the sealing portion 311 is larger than the cross-section of the connecting portion 312, such that the sealing portion 311 protrudes relative to the connecting portion 312 along an axial direction perpendicular to the sliding section 320, that is, the sealing portion 311 protrudes relative to the connecting portion 312 in the horizontal direction by a certain length. The cross-section of the connecting portion 312 is larger than the cross-section of the sliding section 320, such that the connecting portion 312 protrudes relative to the sliding section 320 along an axial direction perpendicular to the sliding section 320, that is, the connecting portion 312 protrudes relative to the sliding section 320 in the horizontal direction by a certain length. When the sealing part 311 blocks the replenishment hole 212, the connecting part 312 can be located in the storage cavity 211. The horizontally protruding portion of the connecting part 312 relative to the sliding section 320 can abut against the storage element 210 to limit its movement, preventing the connecting part 312 from entering the sliding hole 140. This limits the upward sliding position of the sliding section 320 and the entire control valve 301 relative to the sliding hole 140. In other words, when the connecting part 312 abuts against the storage element 210, the control valve 301 slides upward to its limit and cannot slide further upward. When the sealing part 311 blocks the replenishment hole 212, the horizontally protruding portion of the sealing part 311 relative to the connecting part 312 can be located in the storage cavity 211, allowing the sealing part 311 to rest on the storage element 210 and abut against it. By abutting the sealing part 311 against the storage part 210, the sealing part 311 and the entire control valve 301 can be effectively prevented from sliding downward, that is, the sealing part 311 is prevented from sliding downward and opening the liquid replenishment hole 212, thereby effectively exerting the sealing function of the sealing part 311 and the liquid replenishment hole 212.

[0044] See Figure 3 , Figure 5 and Figure 7In some embodiments, the end face of the sealing portion 311 away from the connecting portion 312 is an inclined surface 3111; when the sealing portion 311 blocks the liquid replenishment hole 212, a portion of the inclined surface 3111 is located inside the storage cavity 211 and abuts against the storage member 210. From the end of the inclined surface 3111 located inside the storage cavity 211 to the end located outside the storage cavity 211, the distance from the inclined surface 3111 to the connecting portion 312 gradually increases. By configuring the inclined surface 3111 as described above, when sufficient pressure is applied to the sealing cover 302, the pressure of the sealing cover 302 will be transmitted to the control valve 301, causing the control valve 301 to apply a downward pressure to the storage component 210. That is, the inclined surface 3111 applies a downward pressure to the storage component 210. When the pressure is large enough, the portion of the sealing part 311 that protrudes horizontally relative to the connecting part 312 will undergo a certain deformation, thereby eliminating the contact between the sealing part 311 and the storage component 210. This allows the sealing part 311 to smoothly exit the storage cavity 211 along the extension direction of the inclined surface 3111, and then the sealing part 311 and the entire control valve 301 move downward to open the replenishment hole 212. Obviously, when the sealing part 311 opens the replenishment hole 212, the electrolyte in the storage cavity 211 will be injected into the accommodating cavity through the replenishment hole 212 to achieve replenishment. At the same time, the abutting section 330 will abut against the cover plate 100 to limit the downward movement of the control valve 301, so that the control valve 301 is suspended on the cover plate 100 and cannot detach from the cover plate 100 and the storage unit 200 to fall into the accommodating cavity.

[0045] See Figure 3 , Figure 5 and Figure 7 In some embodiments, the connecting portion 312 has a perforated hole 3121 that extends through the connecting portion 312 along its thickness direction and connects to the storage cavity 211. When the sealing portion 311 opens the replenishment hole 212, one side of the electrolyte can enter the receiving cavity through the replenishment hole 212, and the other side of the electrolyte can enter the receiving cavity through the perforated hole 3121. That is, the electrolyte can enter the receiving cavity through two paths, which allows the electrolyte to enter the receiving cavity quickly in a short time, thereby improving the replenishment speed.

[0046] See Figure 3 , Figure 5 and Figure 7In some embodiments, the cover plate 100 has a mounting surface 150, which is the surface of the cover plate 100 in the thickness direction and is disposed facing away from the storage unit 200. The sealing cover 302 is disposed on the mounting surface 150. When the sealing section 310 covers the liquid replenishment hole 212, the abutment section 330 is further away from the liquid replenishment hole 212 relative to the mounting surface 150. It can be understood that the abutment section 330 is located above the mounting surface 150, so that the distance between the abutment section 330 and the mounting surface 150 is 0.5mm to 2mm. In fact, during the downward sliding process of the control valve 301, the maximum downward sliding stroke of the control valve 301 is the distance between the abutment section 330 and the mounting surface 150. Therefore, when the distance between the abutment section 330 and the mounting surface 150 is controlled, the maximum downward sliding stroke of the control valve 301 can be controlled. By reasonably setting the above stroke, the control valve 301 can slide down a reasonable distance to effectively open the liquid replenishment hole 212.

[0047] See Figure 3 , Figure 5 and Figure 7 In some embodiments, a countersunk hole 151 is recessed on the mounting surface 150, and a sliding hole 140 is recessed on the bottom wall of the countersunk hole 151. The cross-section of the countersunk hole 151 is larger than the cross-section of the sliding hole 140 and the abutment section 330. When the control valve 301 slides downward to its limit position and opens the replenishment hole 212, the abutment section 330 will abut against the bottom wall of the countersunk hole 151. Therefore, by setting the countersunk hole 151, the maximum downward sliding stroke of the control valve 301 can be reasonably increased, thereby ensuring that the control valve 301 effectively opens the replenishment hole 212.

[0048] Therefore, applying pressure to the sealing cover 302 pushes the control valve 301 downwards a certain distance to open the electrolyte replenishment hole 212, allowing the electrolyte in the storage chamber 211 to enter the receiving chamber through the replenishment hole 212 for replenishment. This eliminates the need for irreversible damage to the cover assembly 10 for destructive replenishment, achieving non-destructive battery replenishment and improving the convenience of battery replenishment. It also avoids the risk of battery failure caused by destructive replenishment, improving the safety of replenishment. Simultaneously, when the control valve 301 opens the replenishment hole 212, the control valve 301 is suspended on the cover 100, effectively preventing the control valve 301 from falling into the receiving chamber and affecting the safety of battery use.

[0049] 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.

[0050] 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. A cover assembly for mounting on a battery casing, characterized in that, The cover plate assembly includes: Cover plate; A storage unit, connected to the cover plate, wherein the storage unit has a storage cavity and a replenishment hole, and the storage cavity and the replenishment hole are interconnected; and A valve unit is movably connected to the storage unit and is capable of closing or opening the replenishment hole. When the valve unit opens the replenishment hole, the electrolyte in the storage cavity can flow into the housing through the replenishment hole. Both the cover plate and the storage unit are provided with sliding holes, which are connected to the storage cavity. The valve unit includes a control valve and a sealing cover. The control valve slides with the sliding hole and can close the liquid replenishment hole. The sealing cover is connected to the cover plate and covers the sliding hole. The sealing cover deforms under pressure and pushes the control valve to slide, so that the control valve opens the liquid replenishment hole.

2. The cover plate assembly according to claim 1, characterized in that, The cover plate is also provided with a first injection hole and a second injection hole. The first injection hole is connected to the storage cavity, and the second injection hole is used to connect to the inner cavity of the housing.

3. The cover plate assembly according to claim 1, characterized in that, The control valve is suspended on the sealing cover or the cover plate and opens the liquid replenishment hole.

4. The cover plate assembly according to claim 1, characterized in that, The control valve includes a sealing section, a sliding section, and an abutment section. The sliding section is connected between the sealing section and the abutment section. The sealing section opens or closes the fluid inlet. The sliding section slides in conjunction with the sliding hole. The abutment section protrudes from the side circumferential surface of the sliding section. When the sealing section closes the fluid inlet, the abutment section abuts against the sealing cover. When the sealing section opens the fluid inlet, the abutment section abuts against the cover plate and is located outside the sliding hole.

5. The cover plate assembly according to claim 4, characterized in that, The cover plate has a mounting surface for mounting the sealing cover. When the sealing section covers the liquid replenishment hole, the abutting section is further away from the liquid replenishment hole relative to the mounting surface, and the distance between the abutting section and the mounting surface is 0.5 mm to 2 mm.

6. The cover plate assembly according to claim 5, characterized in that, A countersunk hole is recessed on the mounting surface, and a sliding hole is recessed on the bottom wall of the countersunk hole. The cross-section of the countersunk hole is larger than the cross-section of the sliding hole and the abutment section, and the abutment section can abut against the bottom wall of the countersunk hole.

7. The cover plate assembly according to claim 4, characterized in that, The sealing section includes a sealing part and a connecting part. The connecting part is connected between the sealing part and the sliding section. The cross-section of the sealing part is larger than the cross-section of the connecting part, and the cross-section of the connecting part is larger than the cross-section of the sliding section. When the sealing part blocks the liquid replenishment hole, the connecting part is located in the storage cavity and abuts against the storage unit.

8. The cover plate assembly according to claim 7, characterized in that, It also includes at least one of the following options: The connecting part has a hollow hole that extends through the connecting part along the thickness direction, and the hollow hole communicates with the storage cavity; The end face of the sealing part away from the connecting part is an inclined surface; when the sealing part blocks the liquid replenishment hole, a portion of the inclined surface is located inside the storage cavity and abuts against the storage unit. From the end of the inclined surface located inside the storage cavity to the end located outside the storage cavity, the distance from the inclined surface to the connecting part gradually increases.

9. The cover plate assembly according to claim 1, characterized in that, The storage unit includes a storage component and a support component. The support component is located between the storage component and the cover plate. The storage cavity is formed on the storage component. The cover plate has mounting holes. The support component has multiple explosion-proof holes that communicate with the mounting holes. A flow cavity is formed between the support component and the storage component to communicate with the inner cavity of the housing. The flow cavity communicates with the explosion-proof holes.

10. A battery, characterized in that, The cover assembly includes any one of claims 1 to 9.

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