Cover assembly, battery cell, battery device, and energy storage device

Abstract

The application discloses a cover plate assembly, a battery monomer, a battery device and an energy storage device, and belongs to the technical field of batteries. The cover plate assembly is applied to a battery monomer and comprises a cover plate and a pressure relief structure. The cover plate is provided with a pressure relief hole, and the pressure relief structure is mounted on the cover plate. The pressure relief structure comprises a plurality of valve opening bodies which are distributed at intervals along a first direction. The valve opening bodies are connected to the cover plate and close the pressure relief hole. The valve opening bodies are provided with a plurality of notches. In the technical scheme of the application, the plurality of valve opening bodies can reduce the risk of deformation of the pressure relief structure and the battery monomer shell caused by excessive pressure change, and reduce the influence of deformation of the valve opening bodies on the normal work of the whole pressure relief structure after long-term use.

Description

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 2025203124245, filed on February 25, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of battery technology, and particularly relates to a cover plate assembly, a battery cell, a battery device, and an energy storage device. Background Technology

[0004] In related technologies, the cover of lithium batteries is usually designed with a pressure relief structure. However, for large-capacity lithium batteries, the internal pressure changes are greater. Conventional pressure relief structures are prone to deformation under large pressure impacts, which affects the opening pressure of the overall pressure relief structure. This can lead to the pressure relief structure failing to open normally during thermal runaway, or there may be safety hazards such as premature valve opening of the pressure relief structure. There is room for improvement. Utility Model Content

[0005] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a cover plate assembly, a battery cell, a battery device, and an energy storage device that can reduce the deformation risk of the pressure relief structure.

[0006] In a first aspect, this application provides a cover assembly applied to a battery cell, comprising:

[0007] Cover plate, the cover plate being provided with pressure relief holes;

[0008] A pressure relief structure is installed on the cover plate;

[0009] The pressure relief structure includes multiple valve bodies spaced apart along a first direction. The valve bodies are connected to the cover plate and close the pressure relief hole. The valve bodies are provided with multiple grooves.

[0010] In the above description, by setting the multiple valve bodies, the risk of deformation of the pressure relief structure and the battery cell housing due to excessive pressure changes can be reduced, and the impact of the deformation of the valve bodies on the overall normal operation of the pressure relief structure after long-term use can be reduced.

[0011] According to one embodiment of this application, the opening pressure of the plurality of valve bodies increases sequentially along the arrangement direction from the inside to the outside.

[0012] In the above description, as the internal pressure of the battery cell gradually increases, the pressure is released smoothly in stages, which can reduce the possibility of damage or explosion of the battery cell due to sudden pressure release.

[0013] According to one embodiment of this application, the pressure relief structure further includes a valve body that protrudes from the inner side of the cover plate.

[0014] In the above description, the valve body protrudes from the inner side of the cover plate, and can quickly open the pressure relief structure to release pressure in the event of an abnormality in the battery cell, thereby reducing the risk of the battery cell malfunctioning due to overpressure.

[0015] According to one embodiment of this application, the valve opening body includes a reinforcing rib and a valve opening body body, the reinforcing rib surrounding the valve opening body body, and the thickness of the reinforcing rib being greater than the thickness of the valve opening body body.

[0016] In the above description, by using the valve body with the reinforcing ribs, the service life of the battery cell can be extended and battery failures caused by damage to the valve body can be reduced.

[0017] According to one embodiment of this application, the reinforcing rib is connected to the cover plate by welding.

[0018] In the above description, by welding the reinforcing rib to the cover plate, the structural integrity and connection strength between the valve body and the cover plate can be enhanced, significantly improving the overall structural strength and durability of the cover plate assembly.

[0019] According to one embodiment of this application, at least one side of the valve body distributed along the first direction is flush with the end of the valve body.

[0020] In the above description, by aligning at least one of the valve opening bodies with the valve body at the same height, the tight fit between the two can be strengthened, thereby improving connection strength and sealing performance.

[0021] According to one embodiment of this application, the valve body closest to the outer side of the cover plate among the plurality of valve bodies is provided with a dustproof sheet, and the dustproof sheet is in contact with the valve body.

[0022] In the above description, the dustproof sheet is provided for the valve body closest to the outer side of the cover plate among the plurality of valve bodies, which can protect the valve body from the influence of the external environment.

[0023] Secondly, this application provides a battery cell, characterized in that it comprises:

[0024] The shell forms a cavity;

[0025] Electrode assemblies are installed in the cavity;

[0026] The cover plate assembly is used to seal the cavity.

[0027] In the above description, the battery cell, as the smallest unit of the power battery system, works together with the casing, the electrode assembly, and the cover plate assembly to improve the safety and reliability of the battery cell and help the battery cell safely and efficiently store and release energy.

[0028] Thirdly, this application provides a battery device, characterized in that it includes:

[0029] Multiple battery cells are arranged side by side.

[0030] In the above description, the total energy density of the battery device can be increased by combining multiple battery cells, which helps to efficiently transmit electrical energy.

[0031] Fourthly, this application provides an energy storage device, comprising:

[0032] A plurality of the battery cells or a plurality of the battery devices, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0033] In the above description, a plurality of the battery cells or a plurality of the battery devices constitute the energy storage device, which can be used to store or provide electrical energy.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0036] Figure 1 This is one of the structural schematic diagrams of the cover plate assembly provided in the embodiments of this application;

[0037] Figure 2 This is a second schematic diagram of the structure of the cover plate assembly provided in the embodiments of this application;

[0038] Figure 3 This is a schematic diagram of the valve body of the cover plate assembly provided in the embodiments of this application.

[0039] Figure label:

[0040] Cover plate assembly 10;

[0041] Cover plate 110;

[0042] Valve body 120;

[0043] Pressure relief structure 130, first opening valve body 131, second opening valve body 132, third opening valve body 133;

[0044] Valve body 140, reinforcing rib 141, valve body 142, groove 143;

[0045] Dustproof sheet 150. Detailed Implementation

[0046] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0047] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a cover plate assembly, a battery cell, a battery, and an electrical device that can reduce the risk of deformation of the pressure relief structure.

[0048] The following is for reference. Figures 1-3 Description of cover plate assembly 10 according to an embodiment of this application.

[0049] like Figure 1 As shown, the cover plate assembly 10 is applied to a battery cell and includes: a cover plate 110 and a pressure relief structure 130. The cover plate 110 is provided with a pressure relief hole, and the pressure relief structure 130 is installed on the cover plate. The pressure relief structure 130 includes a plurality of valve bodies 140, which are spaced apart along a first direction X. The valve bodies 140 are connected to the cover plate 110 and close the pressure relief hole. At the same time, the valve bodies 140 are provided with a plurality of grooves 143.

[0050] The cover assembly 10 is the top structure of the battery cell and can be fixed to the battery cell housing by welding or other means to enhance the integrity and sealing of the battery cell. The cover assembly 10 is usually provided with a positive terminal and a negative terminal for connection with external circuits. The cover assembly 10 may also be provided with safety components such as a pressure relief structure 130 to further improve the safety performance of the battery cell.

[0051] The cover plate assembly 10 includes a cover plate 110 and a pressure relief structure 130. The cover plate 110 is the main part of the cover plate assembly 10 and is usually used to seal the battery cell to reduce the risk of electrolyte leakage and external impurities entering the battery cell. The cover plate 110 is provided with a pressure relief hole to release pressure in time when the internal pressure of the battery cell rises abnormally, thereby reducing the risk of battery cell explosion. The pressure relief hole is sealed by the pressure relief structure 130 to maintain the normal operation of the battery cell. When the internal pressure of the battery cell rises abnormally, the pressure relief structure 130 ruptures, and the internal pressure of the battery cell is released through the pressure relief hole.

[0052] The valve body 120 is part of the pressure relief structure 130 and can be integrally machined with the cover plate 110. It is mainly used to provide support and accommodate other components of the pressure relief structure 130 and to enable other components to open smoothly when needed. The pressure relief structure 130 is a safety component in the cover plate assembly 10 and is used to automatically open and release internal pressure when the internal pressure of the battery cell reaches a dangerous level.

[0053] The pressure relief structure 130 may include multiple valve bodies 140, which are spaced apart along a first direction X, where X is the thickness direction of the cover plate 110. The multiple valve bodies 140 are connected to each other by welding or other feasible means. The valve body 140 closest to the cover plate 110 is connected to the cover plate 110 by welding or other feasible connection methods. As the pressure gradually increases, the multiple valve bodies 140 can open sequentially along the arrangement direction from the inside to the outside, thereby releasing the pressure more smoothly.

[0054] Each valve body 140 has multiple grooves 143. The function of the grooves 143 is to reduce the strength of a certain area of ​​the valve body 140. When a specific pressure is reached, the valve body 140 can break along the grooves 143, thereby opening the pressure relief structure 130.

[0055] In related technologies, lithium battery covers are typically designed with pressure relief structures. When the internal pressure of the pressure relief structure reaches its opening pressure, the structure ruptures to provide explosion-proof pressure relief protection. However, for large-capacity lithium batteries, the internal pressure changes are greater. When a large amount of gas is generated inside the cell, it can easily deform the pressure relief structure due to impact, thus affecting the opening pressure of the overall pressure relief structure. This can lead to safety hazards such as the pressure relief structure failing to open properly during thermal runaway or prematurely opening, indicating room for improvement.

[0056] Based on the above considerations, in order to solve the safety hazards caused by the deformation of the pressure relief structure, a cover plate assembly 10 is designed. In this cover plate assembly 10, the pressure relief structure 130 includes multiple sequentially arranged valve bodies 140, which can realize multiple valve opening and pressure relief under different internal pressures of the battery cell, reduce the risk of premature valve opening of the pressure relief structure 130, and at the same time help reduce the risk of deformation of the pressure relief structure 130 and the battery cell shell due to excessive pressure changes.

[0057] According to the cover plate assembly 10 provided in the embodiments of this application, the synergistic effect of the pressure relief hole, valve body 120 and pressure relief structure 130 can reduce the risk of deformation of the pressure relief structure 130 and battery cell housing due to excessive pressure changes. At the same time, by setting multiple valve bodies 140, the impact of deformation of the valve bodies 140 on the overall normal operation of the pressure relief structure 130 after long-term use can be reduced, thereby releasing pressure in a timely manner when the internal pressure of the battery cell rises abnormally.

[0058] In some embodiments, such as Figure 1 and Figure 2 shown, the opening pressures of the multiple valve-opening bodies 140 increase sequentially along the arrangement direction from the inside to the outside.

[0059] The opening pressures of the different valve-opening bodies 140 are different, which can more precisely control the pressure release process and improve the safety and reliability of the battery cell.

[0060] Specifically, the multiple valve-opening bodies 140 are arranged in sequence from the inside of the cover plate 110 to the outside of the cover plate 110, and the opening pressures of the valve-opening bodies 140 increase sequentially along the arrangement direction from the inside to the outside. That is, in the arrangement direction, the opening pressure of each valve-opening body 140 is higher than that of the previous valve-opening body 140. During the operation of the battery cell, as the internal pressure of the battery cell gradually increases, the valve-opening body 140 close to the inside of the cover plate 110 will open first to release a part of the pressure. When the pressure continues to rise, other valve-opening bodies 140 will open sequentially along the arrangement direction to further release the pressure.

[0061] It can be understood that during the process of the gradual increase of the internal pressure of the battery cell, the pressure is released smoothly in stages, which can reduce the damage or explosion of the battery cell caused by the sudden release of pressure.

[0062] Exemplarily, such as Figure 1 and Figure 2 shown, the pressure relief structure 130 may include multiple valve-opening bodies 140 distributed in sequence, and the number of valve-opening bodies 140 is n, satisfying: n≥2.

[0063] There are various arrangement ways for the multiple valve-opening bodies 140, including but not limited to:

[0064] Example 1, such as Figure 1 shown, the pressure relief structure 130 includes a first valve-opening body 131 and a second valve-opening body 132 distributed in sequence.

[0065] The opening pressure of the first valve-opening body 131 is P1, and the opening pressure of the second valve-opening body 132 is P2, satisfying: P1<P2. Specifically, the opening pressure P1 of the first valve-opening body 131 satisfies: 0.1MPa≤P1≤0.3MPa, and the opening pressure P2 of the second valve-opening body 132 satisfies: 0.3MPa≤P2≤0.6MPa.

[0066] Such as Figure 1As shown, the first valve opening body 131 is close to the inner side of the cover plate 110, and the second valve opening body 132 is close to the outer side of the cover plate 110. The two are spaced apart along the thickness direction of the cover plate 110. When the internal pressure of the battery cell exceeds the valve opening pressure P1 of the first valve opening body 131, the first valve opening body 131 opens and bursts, forming a flow channel for gas to pass through between the first valve opening body 131 and the second valve opening body 132, thereby reducing the increased pressure caused by gas generation inside the battery cell, and helping the second valve opening body 132 to open the valve normally when thermal runaway occurs.

[0067] After the first valve opening body 131 opens and bursts, the battery cell continues to work normally. When the internal pressure of the battery cell rises again to exceed the valve opening pressure P2 of the second valve opening body 132, the second valve opening body 132 opens and bursts to further release the pressure.

[0068] Example two, as Figure 2 As shown, the pressure relief structure 130 includes a first valve opening body 131, a second valve opening body 132, and a third valve opening body 133 arranged in sequence.

[0069] The valve opening pressure of the first valve opening body 131 is P1, the valve opening pressure of the second valve opening body 132 is P2, and the valve opening pressure of the third valve opening body 133 is P3, satisfying: P1 < P2 < P3. Specifically, the valve opening pressure P1 of the first valve opening body 131 satisfies: 0.1 MPa ≤ P1 ≤ 0.3 MPa, the valve opening pressure P2 of the second valve opening body 132 satisfies: 0.3 MPa ≤ P2 ≤ 0.6 MPa, and the valve opening pressure P3 of the third valve opening body 133 satisfies: 0.6 MPa ≤ P3 ≤ 1 MPa.

[0070] As Figure 2 As shown, the first valve opening body 131, the second valve opening body 132, and the third valve opening body 133 are arranged in sequence along the direction from the inner side of the cover plate 110 to the outer side of the cover plate 110. The first valve opening body 131 is close to the inner side of the valve body 120, the third valve opening body 133 is close to the outer side of the cover plate 110, and the second valve opening body 132 is located between the first valve opening body 131 and the third valve opening body 133. The three are spaced apart along the thickness direction of the cover plate 110. When the internal pressure of the battery cell exceeds the valve opening pressure P1 of the first valve opening body 131, the first valve opening body 131 opens and bursts, forming a flow channel for gas to pass through between the first valve opening body 131 and the second valve opening body 132, thereby reducing the increased pressure caused by gas generation inside the battery cell, and helping the second valve opening body 132 and the third valve opening body 133 to open the valve normally when thermal runaway occurs.

[0071] After the first valve body 131 bursts, the battery cell continues to operate normally. When the internal pressure of the battery cell rises again to exceed the opening pressure P2 of the second valve body 132, the second valve body 132 bursts, further reducing the pressure of the increased gas production inside the battery cell, which helps the third valve body 133 to open normally in the event of thermal runaway.

[0072] After the second valve body 132 bursts, the battery cell continues to work normally. When the internal pressure of the battery cell rises again to exceed the opening pressure P3 of the third valve body 133, the third valve body 133 bursts, further releasing the pressure.

[0073] In some embodiments, such as Figure 1 and Figure 2 As shown, the pressure relief structure 130 also includes a valve body 120, which protrudes from the inner side of the cover plate 110.

[0074] The valve body 120 protrudes from the inner side of the cover plate 110 and is mainly used to provide support and accommodate other components of the pressure relief structure 130, and to form a good seal between the other components and the cover plate 110, and to be able to open smoothly when needed. At the same time, the protruding valve body 120 can also provide additional support and protection for the pressure relief structure 130, reducing the loosening or damage of the pressure relief structure 130 due to vibration or impact during the operation of the battery cell.

[0075] The pressure relief structure 130 automatically opens when the internal pressure of the battery cell exceeds a certain threshold to release excessive gas pressure. The valve body 120 protrudes from the inside of the cover plate 110, which helps to open the pressure relief structure 130 quickly and unimpeded when there is overpressure inside the battery cell, thus keeping the pressure release channel unobstructed.

[0076] Understandably, the valve body 120 protrudes from the inner side of the cover plate 110, which can quickly open the pressure relief structure 130 to release pressure in the event of an abnormality in a battery cell, thereby reducing the risk of battery cell failure due to overpressure.

[0077] In some embodiments, such as Figure 3 As shown, the valve opening body 140 includes a reinforcing rib 141 and a valve opening body body 142. The reinforcing rib 141 surrounds the valve opening body body 142, and the thickness of the reinforcing rib 141 is greater than the thickness of the valve opening body body 142.

[0078] The reinforcing rib 141 is a structural reinforcement component, typically used to increase the stiffness, strength, and durability of an object. In the valve body 140, the reinforcing rib 141 surrounds the valve body body 142, which can significantly improve the overall structural strength of the valve body 140. By increasing the thickness of the reinforcing rib 141, the pressure resistance of the valve body 140 can be further enhanced, which helps the valve body 140 to remain intact and open smoothly when the internal pressure of the battery cell increases. In addition, the reinforcing rib 141 can also optimize the stress distribution of the valve body 140 and reduce the risk of cracking caused by pressure concentration.

[0079] The valve body 142 is the main part of the valve body 140 and has multiple grooves 143 for cooperating with the valve body 120 and the cover plate 110 to form a sealing structure. When the internal pressure of the battery cell reaches a set value, the valve body 142 breaks along the preset grooves 143, thereby releasing the internal pressure.

[0080] It is understandable that by using a valve body 140 with reinforcing ribs 141, the service life of individual battery cells can be extended and battery failures caused by damage to the valve body 140 can be reduced.

[0081] In some embodiments, the reinforcing rib 141 is welded to the cover plate 110.

[0082] Welding is a process of joining materials together by melting them. In the cover plate assembly 10, welding is used to connect the reinforcing rib 141 to the cover plate 110 to improve the connection strength between the two. At the same time, the welded connection has high strength, high sealing and good durability, and can withstand extreme conditions such as high pressure and vibration inside the battery cell.

[0083] The reinforcing rib 141 surrounds the valve body 142 and is connected to the cover plate 110 by welding, which can enhance the structural strength of the valve body 140. At the same time, the valve body 140 and the cover plate 110 are integrated by welding, which strengthens the tight fit and firm connection between the reinforcing rib 141 and the cover plate 110, and can reduce the risk of loosening or falling off during use.

[0084] It is understandable that by welding the reinforcing rib 141 to the cover plate 110, the structural integrity and connection strength between the valve body 140 and the cover plate 110 can be enhanced, significantly improving the overall structural strength and durability of the cover plate assembly 10.

[0085] In some embodiments, at least one side of the valve body 140 distributed along the first direction X is flush with the end of the valve body 120.

[0086] Multiple valve bodies 140 are arranged sequentially from the inside of the cover plate 110 to the outside of the cover plate 110. At least one valve body 140 is at the same height as the end of the valve body 120. For example, the reinforcing rib 141 of the valve body 140 near the outside of the cover plate 110 is flush with the end of the valve body 120 near the outside of the cover plate 110, and the valve body 140 near the inside of the valve body 120 is flush with the inside of the valve body 120, thereby reducing structural complexity and potential stress concentration points.

[0087] Understandably, by aligning at least one valve body 140 with the valve body 120 at the same height, the tight fit between the two can be enhanced, thereby improving connection strength and sealing.

[0088] In some embodiments, as shown in the figure, the valve body 140 closest to the outer side of the cover plate 110 among the plurality of valve bodies 140 is provided with a dustproof sheet 150, and the dustproof sheet 150 is in contact with the valve body 140.

[0089] The dust cover 150 is made of corrosion-resistant and wear-resistant materials, such as plastic or special coating materials. The main function of the dust cover 150 is to reduce the entry of external dust, moisture and other impurities into the battery cell, thereby protecting the cleanliness and safety of the battery cell.

[0090] During the operation of a single battery cell, the valve body 140 may be affected by external factors such as vibration, impact, or foreign objects. The dustproof sheet 150 is installed on the outside of the cover plate 110 and contacts the valve body 140 closest to the outside of the cover plate 110. It can cover the pressure relief hole, forming an additional barrier, providing a certain buffer, and protecting the valve body 140 closest to the outside of the cover plate 110 from dust or foreign objects, reducing the risk of damage caused by external factors. At the same time, the dustproof sheet 150 can also reduce corrosion and aging problems caused by long-term exposure of the valve body 140 closest to the outside of the cover plate 110 to the external environment, thereby extending the service life of the valve body 140.

[0091] When the internal pressure of the battery reaches the set value, the valve body 140 closest to the outer side of the cover plate 110 breaks and opens along the preset groove 143, releasing the internal pressure. The dustproof sheet 150 is completely washed away, without affecting the normal opening function of the valve body 140.

[0092] It is understandable that providing a dustproof sheet 150 for the valve body 140 closest to the outer side of the cover plate 110 among the multiple valve bodies 140 can protect the valve body 140 from the influence of the external environment.

[0093] This application embodiment also provides a battery cell, which includes: a housing, an electrode assembly, and a cover assembly 10, wherein the housing forms a cavity, the electrode assembly is installed in the cavity, and the cover assembly 10 is used to seal the cavity.

[0094] As the smallest unit constituting a power battery system, each battery cell has independent energy storage and output capabilities. The battery cell is mainly composed of a casing, electrode assembly, and cover plate assembly, etc. These parts work together to enable the battery cell to safely and efficiently store and release energy.

[0095] The casing is the external protective structure of the battery cell, mainly serving to protect and seal it. It can effectively reduce damage to the electrode components caused by external impacts or pressure. The casing is usually made of high-strength and corrosion-resistant materials such as metal or plastic. On the inner surface of the casing, a second guide channel can be provided. The design of the second guide channel helps to guide any leaked liquids or gases that may be generated inside the battery cell, reducing the risk of them accumulating inside the battery cell or overflowing into the external environment, thereby further improving the safety and reliability of the battery cell.

[0096] The electrode assembly is the core part of the battery cell, used to store electrical energy. It is located inside the casing and connected to the external circuit through the cover assembly 10 to realize the transfer of electrical energy between battery cells. The electrode assembly is usually composed of key components such as positive electrode, negative electrode, electrolyte and separator. The positive electrode and negative electrode store and release energy respectively, the electrolyte is responsible for transferring ions between the positive and negative electrodes, and the separator is used to separate the positive and negative electrodes to prevent short circuit.

[0097] The cover assembly 10 is the top structure of the battery cell, which is fixed to the housing by welding or other means to enhance the integrity and sealing of the battery cell. The cover assembly 10 is usually provided with a positive terminal and a negative terminal for connection with external circuits. The cover assembly 10 may also be provided with a pressure relief structure 130 or a sealing ring and other safety components to further improve the safety performance of the battery cell.

[0098] When a battery cell is charging, an external power source provides electrical energy to the electrode assembly through the positive and negative terminals. The chemical reaction in the electrode assembly converts electrical energy into chemical energy and stores it in the electrode assembly. When a battery cell is discharging, the chemical reaction in the electrode assembly converts chemical energy back into electrical energy and provides electrical energy to the external circuit through the positive and negative terminals.

[0099] It is understandable that, as the smallest unit of a power battery system, the battery cell, through the cooperation of the casing, electrode assembly, and cover plate assembly 10, can improve the safety and reliability of the battery cell and help the battery cell safely and efficiently store and release energy.

[0100] This application also provides a battery device, including a plurality of battery cells arranged side by side.

[0101] In the technical solution of this application, the battery device is composed of multiple battery cells to realize the effective transmission and sharing of electrical energy. The battery cell is the basic unit that makes up the battery device. Each battery cell has independent electrical energy storage and output capabilities and is usually composed of a shell, a cover plate assembly 10 and an electrode assembly. The electrode assembly is the core part of the battery cell, which is used to store electrical energy. It is located inside the shell and is connected to the external circuit through the cover plate assembly 10 to realize the transmission of electrical energy between battery cells.

[0102] Multiple battery cells can be connected in series or in parallel to form a circuit structure. Series connection can increase the total voltage of the battery device, which is suitable for applications that require high voltage output. Parallel connection can increase the total capacity of the battery device, which is suitable for applications that require long-term operation or high energy density.

[0103] Understandably, combining multiple battery cells can increase the overall energy density of a battery device, which helps in the efficient transmission of electrical energy.

[0104] This application also provides an energy storage device, including multiple battery cells or multiple battery devices, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0105] An energy storage device is a system composed of multiple battery cells or multiple battery devices, used to store or provide electrical energy. Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output electrical energy at appropriate times. For example, energy storage devices can store electrical energy during off-peak hours and provide electrical energy to relevant users or electrical devices during peak hours.

[0106] Energy storage devices can convert electrical energy into chemical energy and store it through individual battery cells. When a battery cell is charging, an external power source provides electrical energy. Through the electrochemical reaction of the battery cell, the electrical energy is stored in the positive and negative electrodes of the battery cell. When electrical energy is needed, the battery cell converts the stored chemical energy into electrical energy through an electrochemical reaction to supply the external load.

[0107] It is understandable that multiple battery cells or multiple battery devices can form an energy storage device, which can be used to store or provide electrical energy.

[0108] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0109] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0110] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0111] In the description of this application, "multiple" means two or more.

[0112] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0113] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0115] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly applied to a battery cell, characterized in that, include: Cover plate, the cover plate being provided with pressure relief holes; A pressure relief structure is installed on the cover plate; The pressure relief structure includes multiple valve bodies spaced apart along a first direction. The valve bodies are connected to the cover plate and close the pressure relief hole. The valve bodies are provided with multiple grooves.

2. The cover plate assembly according to claim 1, characterized in that, The opening pressure of the multiple valve bodies increases sequentially from the inside to the outside along their arrangement.

3. The cover plate assembly according to claim 1, characterized in that, The pressure relief structure also includes a valve body that protrudes from the inner side of the cover plate.

4. The cover plate assembly according to claim 1, characterized in that, The valve opening body includes a reinforcing rib and a valve opening body body. The reinforcing rib surrounds the valve opening body body body, and the thickness of the reinforcing rib is greater than the thickness of the valve opening body body body.

5. The cover plate assembly according to claim 4, characterized in that, The reinforcing ribs are welded to the cover plate.

6. The cover plate assembly according to any one of claims 1-5, characterized in that, At least one side of the valve body distributed along the first direction is flush with the end of the valve body.

7. The cover plate assembly according to any one of claims 1-5, characterized in that, The valve body closest to the outer side of the cover plate among the plurality of valve bodies is provided with a dustproof sheet, and the dustproof sheet is in contact with the valve body.

8. A single battery cell, characterized in that, include: The shell forms a cavity; Electrode assemblies are installed in the cavity; The cover plate assembly as described in any one of claims 1-7 is used to seal a cavity.

9. A battery device, characterized in that, include: Multiple battery cells as described in claim 8, wherein the multiple battery cells are arranged side by side.

10. An energy storage device, characterized in that, include: A plurality of battery cells as described in claim 8 or a plurality of battery devices as described in claim 9, wherein the battery cells or the battery devices are used to store or provide electrical energy.

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