Deformation piece, cover plate and battery

Abstract

The utility model discloses a deformation piece, a cover plate and a battery, and the deformation piece for the cover plate comprises a connecting part which is used for being electrically connected with a first pole of the cover plate, and the connecting part is an annular piece; the overturning part is an annular piece, and the outer periphery of the overturning part is connected with the inner periphery of the connecting part; the protruding part is arranged on the inner periphery of the overturning part; when the deformation piece is in the initial state, the inner periphery of the overturning part extends in the direction away from the cover body of the cover plate, and the end, close to the cover body, of the protruding part does not exceed the end face, close to the cover body, of the connecting part and is separated from the cover body. When the deformation piece is in the protection state, the inner periphery of the overturning part extends in the direction close to the cover body, and the end, close to the cover body, of the protruding part is electrically connected with the cover body. The deformation piece can improve the safety performance, and is beneficial to the small-size design of the appearance of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a modified part, a cover plate, and a battery. Background Technology

[0002] With the rapid development of electric vehicles and renewable energy storage systems, the safety of power batteries and energy storage batteries, as core energy storage units, has become a major concern. During battery cycle charging and discharging, internal electrochemical reactions generate gases. The accumulation of these gases can lead to battery swelling, leakage, and even thermal runaway, especially under extreme conditions such as high temperature, overcharging, and over-discharging, further exacerbating safety risks. Battery safety is directly related to the safety of users' lives and property and the reliable operation of equipment, and is a key indicator in battery design and application.

[0003] However, existing battery technologies still have shortcomings in gas management and safety protection, making it difficult to effectively suppress gas generation and the resulting safety hazards. Therefore, improving battery design to enhance safety performance has become a crucial issue that urgently needs to be addressed in the field of battery technology.

[0004] Existing technology improves battery safety by incorporating a short-circuit protection structure within the battery cover. When the internal gas pressure increases, this structure physically deforms, causing a short circuit between the positive and negative terminals. However, this design requires short-circuit connectors on the outside of the battery cover, resulting in a significant increase in external space occupied by the terminals and negatively impacting battery assembly. Utility Model Content

[0005] One objective of this application is to provide a deformable cover plate that can solve the technical problem that the existing short-circuit protection structure requires a short-circuit electrical connection piece to be set on the outside of the battery cover plate, resulting in a large external space occupied by the terminal post.

[0006] Another object of this application is to provide a cover plate including the above-described modified part.

[0007] Another object of this application is to provide a battery including the aforementioned cover.

[0008] To achieve the above objectives, this application provides the following technical solutions.

[0009] A deformable member for a cover plate according to a first aspect embodiment of this application includes: a connecting portion for electrically connecting to a first electrode post of the cover plate, the connecting portion being an annular member; a flipping portion, the flipping portion being an annular member, the outer periphery of the flipping portion being connected to the inner periphery of the connecting portion, the flipping portion being deformable to switch the deformable member between an initial state and a protected state; and a protrusion disposed on the inner periphery of the flipping portion; wherein, when the deformable member is in the initial state, the inner periphery of the flipping portion extends toward the cover body away from the cover plate, the end of the protrusion near the cover body does not extend beyond the end face of the connecting portion near the cover body, and is spaced apart from the cover body; during the process of the internal pressure of the battery increasing to a preset value, the deformable member switches from the initial state to the protected state, the inner periphery of the flipping portion extends toward the cover body, the end of the protrusion near the cover body is electrically connected to the cover body, so that a second electrode post installed on and electrically connected to the cover body is short-circuited to the first electrode post through the deformable member.

[0010] Optionally, when the deformable part is in the protected state, the end of the protrusion away from the cover does not extend beyond the end face of the connecting part away from the cover.

[0011] Optionally, the end of the protrusion away from the cover is a plane; and / or, the end of the protrusion near the cover is a plane; and / or, the protrusion is a cylindrical part; and / or, the flipping part is a circular part; and / or, the protrusion is located at the center of the flipping part; and / or, the deformable part is an integrally formed part.

[0012] A cover plate according to a second aspect of this application includes: a cover body having a first mounting hole and a second mounting hole; a first terminal and a second terminal, the first terminal being mounted in the first mounting hole and insulated from the cover body, the second terminal being mounted in the second mounting hole and electrically connected to the cover body, the first terminal and the second terminal having opposite polarities; and a deformable member disposed on the side of the cover body near the inside of the battery and electrically connected to the first terminal, the deformable member being a deformable member for a cover plate according to any of the above descriptions.

[0013] Optionally, the cover plate further includes: an insulating member located on the side of the cover body near the inside of the battery; the insulating member has a first through hole, a second through hole, and a third through hole; the first through hole corresponds to the position of the first mounting hole for mounting the first terminal; the second through hole corresponds to the position of the second mounting hole for mounting the second terminal; one end of the deformable member is electrically connected to the first terminal; and the other end of the deformable member corresponds to the position of the third through hole; wherein, when the deformable member is in the initial state, the deformable member is spaced apart from the cover body; and when the deformable member is in the protected state, the other end of the deformable member passes through the third through hole and contacts the cover body to form a short circuit.

[0014] Optionally, the cover plate further includes: a connector located on the side of the cover body near the inside of the battery, the connector having the deformable member disposed thereon, and the connector being used to connect with the first electrode post.

[0015] Optionally, the connector includes: a first connecting piece for connecting to a first pole post; and a second connecting piece connected to the first connecting piece, wherein the deformable element is disposed on the second connecting piece.

[0016] Optionally, the first connecting piece is provided with a first step structure, the first pole post is mounted on the first step structure and welded to the first connecting piece; or, the second connecting piece is provided with a second step structure, the deformable member is disposed on the second step structure and welded to the second connecting piece; or, the second connecting piece is provided with a third step structure, the first connecting piece is disposed on the third step structure and welded to the second connecting piece.

[0017] A battery according to a third aspect of this application includes: a housing and a cover plate, the cover plate being the cover plate described above, wherein a receiving space is enclosed between the housing and the cover plate; an electrode assembly located in the receiving space, the electrode assembly having two tabs, the two tabs being respectively connected to a first terminal and a second terminal via adapter pieces.

[0018] A battery according to a fourth aspect of this application includes: a housing and a cover plate, the cover plate being the cover plate described above, wherein a receiving space is enclosed between the housing and the cover plate; an electrode assembly located in the receiving space, the electrode assembly having two tabs, one tab having the same polarity as the first electrode post being connected to the first electrode post via a connector of the cover plate, and the other tab having the opposite polarity to the first electrode post being connected to the second electrode post via an adapter piece.

[0019] In this embodiment, on the one hand, the deformable part can be placed inside the cell, and the deformation of the deformable part under pressure and its contact with the cover can ensure the universality of the positive and negative terminals on the outside of the battery, and will not occupy too much space on the outer surface of the cover. This is conducive to the standardized design when the cells are assembled, reduces the difficulty of sealing design, and improves safety and reliability. The assembly form of the terminals and the cover is not limited to riveting. Based on the goal of low cost design, injection molding can be used. On the other hand, when the deformable part is in the initial state, the inner periphery of the flipping part extends toward the cover away from the cover plate. The end of the protrusion near the cover does not exceed the end face of the connecting part near the cover and is spaced apart from the cover. This can increase the distance between the cover and the protrusion and avoid accidental contact between the cover and the protrusion.

[0020] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0022] Figure 1 This is an assembly diagram of the housing and electrode assembly according to one embodiment of this application;

[0023] Figure 2 This is an exploded view of a cover plate according to an embodiment of this application;

[0024] Figure 3 This is an assembly diagram of the cover, insulating component, and adapter piece according to one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the assembly structure of the negative electrode post, the first connecting piece, the second connecting piece and the deformable part according to another embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the assembly structure of the first connecting piece, the second connecting piece, and the deformable part according to an embodiment of this application;

[0027] Figure 6 This is an assembly diagram of the first connecting piece and the second connecting piece according to an embodiment of this application;

[0028] Figure 7 This is a structural schematic diagram of the inner side surface of the cover according to an embodiment of this application;

[0029] Figure 8 This is a cross-sectional view of a cover plate according to an embodiment of this application;

[0030] Figure 9 This is a partially enlarged cross-sectional view of a cover plate according to an embodiment of this application;

[0031] Figure 10 This is a schematic diagram of a modified part in its initial state according to an embodiment of this application;

[0032] Figure 11 This is a schematic diagram of a modified part in a protected state according to an embodiment of this application;

[0033] Figure 12 This is a partial cross-sectional view of a cover plate according to an embodiment of this application;

[0034] Figure 13 This is a partial cross-sectional view of a cover plate according to an embodiment of this application.

[0035] Attached icon number

[0036] Cover 10; First mounting hole 11; Second mounting hole 12; Groove 13;

[0037] First pole piece 21; Second pole piece 22;

[0038] Insulating component 30; First through hole 31; Second through hole 32; Third through hole 33;

[0039] Deformable part 40; Connecting part 41; Flipping part 42; Protrusion 43;

[0040] First connecting piece 50; First step structure 51;

[0041] Second connecting piece 60; Second step structure 61; Third step structure 62;

[0042] 71. Plastic on the positive electrode; 72. Plastic on the negative electrode; 73. Sealing ring; 74. Positive electrode connecting block; 75. Positive electrode adapter piece;

[0043] Casing 80;

[0044] Electrode assembly 90. Detailed Implementation

[0045] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0046] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0047] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0048] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0050] The cover plate according to an embodiment of this application is described in detail below with reference to the accompanying drawings.

[0051] The cover plate according to the embodiments of this application can be used for batteries, such as... Figures 1 to 13 As shown, the battery may include a housing 80 and a cover 10, with a receiving space enclosing the housing 80 and the cover 10. Electrode assemblies 90 are installed within the receiving space. The housing 80 has a length direction, a height direction, and a thickness direction; for example, the length direction can be defined as the Z-axis direction, the height direction as the X-axis direction, and the thickness direction as the Y-axis direction. When multiple electrode assemblies 90 are installed within the housing 80, the multiple electrode assemblies 90 can be arranged sequentially along the Y-axis direction.

[0052] The cover 10 has a first mounting hole 11 and a second mounting hole 12 as electrode post holes, for example, the first mounting hole 11 and the second mounting hole 12 are spaced apart along the Z-axis direction. A first electrode post 21 is installed in the first mounting hole 11, and a second electrode post 22 is installed in the second mounting hole 12. The first electrode post 21 and the second electrode post 22 have opposite polarities. For example, the first electrode post 21 is a negative electrode post, and the second electrode post 22 is a positive electrode post, extending along the X-axis direction, and the first electrode post 21 and the second electrode post 22 are spaced apart along the Z-axis direction.

[0053] Furthermore, the cover 10 can be made of metal. The first terminal 21 is insulated from the cover 10 and electrically connected to the deformable member 40. The second terminal 22 is electrically connected to the cover 10. For example, the positive terminal is electrically connected to the cover 10, so the cover 10 is positively charged; the negative terminal is connected to the cover 10 through an insulating structure. In addition, the deformable member 40 is directly or indirectly connected to the negative terminal, and the deformable member 40 is negatively charged. In this embodiment, the deformable member 40 is located inside the battery. When the internal pressure of the battery is too high, the deformable member 40 connected to the first terminal 21 moves from a state spaced apart from the cover 10 towards the cover 10 under the action of air pressure until it contacts the cover 10. This is equivalent to the first terminal 21 and the second terminal 22 forming a circuit through the cover 10 and the deformable member 40; causing a short circuit between the first terminal 21 and the second terminal 22, i.e., a positive and negative short circuit, which can protect the battery using the cover of this embodiment.

[0054] The following is a detailed description of the deformable part 40 for the cover plate according to an embodiment of this application.

[0055] like Figures 10 to 13 As shown, the deformable member 40 for the cover plate according to an embodiment of this application includes: a connecting part 41, a flipping part 42, and a protrusion 43.

[0056] Specifically, the connecting part 41 is used for electrical connection with the first pole 21 of the cover plate. The connecting part 41 is an annular part, and the flipping part 42 is an annular part. The outer periphery of the flipping part 42 is connected to the inner periphery of the connecting part 41. The flipping part 42 can be deformed to switch the deformable part 40 between an initial state and a protected state. The protrusion 43 is provided on the inner periphery of the flipping part 42. When the deformable part 40 is in the initial state, the inner periphery of the flipping part 42 extends toward the cover body 10 away from the cover plate, and the protrusion 43 is close to the cover body 10. One end does not extend beyond the end face of the connecting part 41 near the cover 10 and is spaced apart from the cover 10; during the process of the internal pressure of the battery increasing to a preset value, the deformable part 40 switches from the initial state to the protective state. When the deformable part 40 is in the protective state, the inner periphery of the flipping part 42 extends toward the direction close to the cover 10, and the end of the protrusion 43 near the cover 10 is electrically connected to the cover 10, so that the second pole post 22 installed on the cover 10 and electrically connected to the cover 10 is short-circuited to the first pole post 21 through the deformable part 40.

[0057] In other words, the deformable member 40 for the cover plate according to the embodiments of this application mainly consists of a connecting part 41, a flipping part 42, and a protrusion 43. The cover plate includes a cover body 10 and the deformable member 40. In this embodiment, the connecting part 41 and the flipping part 42 are both annular members, with the inner periphery of the connecting part 41 connected to the outer periphery of the flipping part 42, and the inner periphery of the flipping part 42 provided with a protrusion 43. Furthermore, the connecting part 41 is electrically connected to the first pole post 21, and the two can be connected directly or indirectly.

[0058] As the internal pressure of the battery increases, the internal air pressure drives the flipping part 42 to deform, and the protrusion 43 moves toward the cover 10. For example, the protrusion 43 is located in the middle of the annular flipping part 42 or at the center of the annular flipping part 42, and extends toward the cover 10. For example, the height of the protrusion 43 extends approximately along the X-axis.

[0059] In this embodiment, the deformable part 40 mainly adopts a combination of a connecting part 41, a flipping part 42, and a protrusion 43. For example, the deformable part 40 is a flipping piece composed of the connecting part 41, the flipping part 42, and the protrusion 43. The lower end of the first electrode post 21 is installed on the connecting part, and the connecting part 41 is also provided on the connecting part. The flipping part 42 is connected to the connecting part 41. The protrusion 43 is located at the inner edge of the annular flipping part 42. When the internal pressure of the battery increases to a preset value, the inner edge of the flipping part 42 moves towards the position close to the cover 10, and the protrusion 43 moves towards the cover 10, thereby making the protrusion 43 contact the cover 10. By setting the deformable part 40 on the connecting part, that is, on the extension structure of the first electrode post, the deformable part 40 is inside the battery, which does not easily affect the electrode terminal structure outside the battery, avoids occupying space outside, and avoids affecting battery pack assembly.

[0060] When the deformable part 40 of this embodiment is applied to the battery, it is directly or indirectly connected to the first terminal 21. When the internal pressure of the battery is less than a preset value, the deformable part 40 is spaced apart from the cover 10. When the internal pressure of the battery increases to the preset value, the protrusion 43 can move under the pressure until it contacts the cover 10, causing a short circuit between the first terminal 21 and the second terminal 22, resulting in a positive and negative short circuit. For example, when the internal air pressure of the battery increases, the flipping part 42 will deform towards the cover 10 until the protrusion 43 contacts the cover 10. Since the cover 10 is electrically connected to the positive terminal, the entire cover 10 is positively charged. The deformable part 40 is connected to the negative terminal, so it is negatively charged. Therefore, when the protrusion 43 contacts the cover 10 after deformation, a positive and negative short circuit will be formed, thereby protecting the battery.

[0061] In other words, when the deformable part 40 of this application is applied to a battery, the deformable part 40 can switch from the initial state to the protection state under the action of the gas pressure inside the battery. The deformable part 40 in the initial state and the protection state will be described in detail below.

[0062] First, when the deformable part 40 is in its initial state, the inner periphery of the flipping part 42 extends toward the cover body 10 away from the cover plate, and the protrusion 43 connected to the inner periphery of the flipping part 42 also moves away from the cover body 10 and is spaced apart from the cover body 10. Furthermore, as... Figure 10As shown, in the distribution direction of the cover 10 and the electrode assembly 90, the end of the protrusion 43 near the cover 10 does not extend beyond the end face of the connecting portion 41 near the cover 10, and is spaced apart from the cover 10. For example, along the upward direction, the upper surface of the protrusion 43 is not higher than the upper end face of the connecting portion 41, which can increase the distance between the cover 10 and the protrusion 43 and avoid accidental contact between the cover 10 and the protrusion 43; it can also ensure that the flexible structure of the flipping portion 42 has complete elastic deformation potential energy; in addition, since the upper surface of the protrusion 41 does not exceed the connecting portion 41, the flipping portion 42 accumulates potential energy as gas is generated inside the battery. When the internal pressure of the battery reaches the set value, the flipping portion 42 can be flipped quickly, that is, slow absorption and fast reversal are achieved, and the flipping response is more stable.

[0063] Secondly, after the deformable part 40 switches from the initial state to the protected state, the inner periphery of the flipping part 42 extends toward the cover 10, and the end of the protrusion 43 near the cover 10 is electrically connected to the cover 10. For example, the upper end of the protrusion 43 contacts the lower side of the cover 10. At this time, the second pole 22 is short-circuited to the first pole 21 through the deformable part 40.

[0064] In the embodiments of this application, the deformable part 40 can be disposed inside the battery cell, and the flipped part 42 deforms under pressure, with the protrusion 43 contacting the cover 10. This ensures the universality and consistency of the positive and negative terminals on the outside of the battery, and does not excessively occupy the outer surface space of the cover 10, which is beneficial for the standardized design when assembling battery cells. Moreover, since the deformable part 40 is disposed inside the battery cell, the terminals exposed on the outside of the battery cell do not need to be additionally enlarged or lengthened, and do not occupy the external space of the cover 10. In addition, since the deformable part 40 is disposed inside the battery cell, and there is no need to make openings in the cover 10 for assembly, the sealing design is greatly reduced, and safety and reliability are improved. Furthermore, since the deformable part 40 is disposed inside the battery cell, and the external terminals of the terminals do not need to be designed to be large, the assembly form of the terminals and the cover 10 is not limited to riveting. Based on the goal of low-cost design, injection molding can be used. That is to say, when using the deformable part 40 of the embodiments of this application, the assembly form of the terminals is not limited, and injection molding has a cost advantage over riveting structures.

[0065] Furthermore, traditional flip-plate designs, which are typically located on or outside the cover 10, place excessively high demands on welding reliability or require secondary sealing design. The modified component 40 structure of this embodiment, however, does not alter the original electrode sealing assembly structure, thus improving the overall sealing safety of the battery cell.

[0066] According to one embodiment of this application, such as Figure 11As shown, when the deformable part 40 is in a protected state, that is, when the inner periphery of the flipping part 42 extends toward the direction of the cover, and the end of the protrusion 43 near the cover is electrically connected to the cover, the end of the protrusion 43 away from the cover 10 does not extend beyond the end face of the connecting part 41 away from the cover 10. In other words, in the distribution direction of the cover 10 and the electrode assembly 90, the surface of the protrusion 43 near the electrode assembly 90 does not exceed the surface of the connecting part 41 near the electrode assembly 90. For example, along the vertical direction, the lower surface of the protrusion 43 does not exceed the lower surface of the connecting part 41. There is an inflection point between the protrusion 43 and the flipping part 42, which not only allows the flipping part 42 to have sufficient flexible space to facilitate potential energy accumulation, but also, in the potential energy accumulation stage before the flipping part 42 flips, the stress in the inflection point area connecting the flipping part 42 and the protrusion 43 is relatively large. At this time, due to the elastic deformation of the flipping part 42 and the gravity of the protrusion 43, the gas pressure inside the battery can be converted into the elastic potential energy of the flipping part 42. By adopting an inflection point between the protrusion 43 and the flipping part 42, the start-up time of the flipping can be fixed, and the stability is higher.

[0067] In some specific embodiments of this application, the end of the protrusion 43 away from the cover 10 is flat, which can prevent the deformable part 40 from being too thick, for example, occupying a large area in the X-axis direction; and / or, the end of the protrusion 43 near the cover 10 is flat, which facilitates increasing the contact area with the cover 10; and / or, the protrusion 43 is a cylindrical part, for example, the protrusion 43 is a cylindrical part extending along the X-axis direction, which facilitates contact with the cover 10; and / or, the flipping part 42 is a ring part, which facilitates the processing and installation of the protrusion 43 and its connection with the connecting part 41, in which case the connecting part 41 can be located on the outermost side of the flipping part 42; and / or, the protrusion 43 is located at the center of the flipping part 42, for example, the protrusion 43 can be located at the center of the flipping part 42, which facilitates the balanced force distribution at multiple locations; and / or, the deformable part 40 is a one-piece molded part, which can shorten the assembly time. It is understood that different design requirements can be met by implementing at least one of the above conditions.

[0068] This application also discloses a cover plate, including: a cover body 10, a first terminal 21, a second terminal 22, and a deformable member 40. The cover body 10 can be a metal part, and the cover body 10 is provided with a first mounting hole 11 and a second mounting hole 12. The first terminal 21 is installed in the first mounting hole 11 and is insulated from the cover body 10. The second terminal 22 is installed in the second mounting hole 12 and is electrically connected to the cover body 10. The first terminal 21 and the second terminal 22 have opposite polarities. The deformable member 40 is disposed on the side of the cover body 10 near the inside of the battery and is electrically connected to the first terminal 21 installed in the first mounting hole 11. The deformable member 40 is the deformable member 40 for the cover plate of any of the above embodiments. Since the deformable member 40 for the cover plate according to the embodiments of this application has the above advantages, such as high safety, the cover plate of the embodiments of this application also has the above advantages, which will not be elaborated here.

[0069] According to one embodiment of this application, the cover plate further includes: an insulating member 30, located on the side of the cover 10 near the inside of the battery; the insulating member 30 has a first through hole 31, a second through hole 32, and a third through hole 33; the first through hole 31 corresponds to the position of the first mounting hole 11 for mounting a first terminal 21 that is insulated from and connected to the cover 10; the second through hole 32 corresponds to the position of the second mounting hole 12 for mounting a second terminal 22 that is electrically connected to the cover 10 and has the opposite polarity to the first terminal 21; one end of the deformable member 40 is electrically connected to the first terminal 21, and the other end of the deformable member 40 corresponds to the position of the third through hole 33. For example, one end of the deformable member 40 is located on the side of the insulating member 30 away from the cover 10 and is connected to and electrically connected to the first terminal 21. When the deformable part 40 is in the initial state, the deformable part 40 is spaced apart from the cover 10. When the deformable part 40 is in the protected state, another end of the deformable part 40 passes through the third through hole 33 and contacts the cover 10, which is equivalent to the first pole 21 and the second pole 22 forming a circuit through the cover 10 and the deformable part 40; causing the first pole 21 and the second pole 22 to short circuit, that is, a positive and negative short circuit occurs, which can protect the battery using the cover plate of this application embodiment.

[0070] In other words, an insulating component 30 is provided on the side of the cover 10 near the inside of the battery, for example, the insulating component 30 is arranged approximately parallel to the cover 10. The insulating component 30 can be made of plastic sheet or the like, and the use of a plate-like structure can reduce the space occupied. The insulating component 30 is provided with a first through hole 31, a second through hole 32, and a third through hole 33, for example, the first through hole 31, the second through hole 32, and the third through hole 33 are spaced apart along the Z-axis, and the third through hole 33 is located between the first through hole 31 and the second through hole 32. The first through hole 31 corresponds to the position of the first mounting hole 11, and the second through hole 32 corresponds to the position of the second mounting hole 12, for example, they correspond in the X-axis direction. That is to say, the inner end of the first electrode post 21 can pass through the first mounting hole 11 and the first through hole 31 in sequence and then connect to the corresponding electrode tab. Similarly, the inner end of the second electrode post 22 can also pass through the second mounting hole 12 and the second through hole 32 in sequence and then connect to the corresponding electrode tab.

[0071] Furthermore, the insulating member 30 has a third through hole 33, and at least a portion of the deformable member 40 corresponds to the third through hole 33, for example, in the X-axis direction, allowing the deformable member 40 to deform and contact the cover 10. For example, at least a portion of the deformable member 40 deforms along the X-axis direction until it contacts the cover 10. When the internal pressure of the battery is less than a preset value, the deformable member 40 is spaced apart from the cover 10. When the internal pressure of the battery increases to the preset value, a portion of the deformable member 40 can extend out of the third through hole 33 under pressure and contact the cover 10, causing a short circuit between the positive and negative terminals. For example, when the internal gas pressure of the battery increases, the deformable member 40 will deform towards the cover 10, passing through the third through hole 33 until it contacts the cover 10.

[0072] Furthermore, since the deformable part 40 includes a flipping portion 42 and a protrusion 43, when the internal pressure of the battery increases to a preset value, the flipping portion 42 moves towards a position closer to the cover 10 until the protrusion 43 extends out of the third through hole 33 and contacts the cover 10. That is, the flipping portion 42 is used to deform as the air pressure increases during battery cycling. For example, the deformable part 40 is provided on the second connecting piece 60. When the internal pressure of the cell increases, it deforms and flips upward. The protrusion 43 contacts the cover 10 to form a current path loop, realizing short-circuit protection under overcharge. For another example, the connecting portion 41 is provided in the middle of the first connecting piece 50 or the second connecting piece 60 or near the Z-axis end. The connecting portion 41 connects the second connecting piece 60 and the flipping portion 42. The protrusion 43 is provided at the center of the annular flipping portion 42 and its axial direction extends towards the direction of the cover 10. For example, the axial direction of the cylindrical protrusion 43 extends approximately along the X-axis direction. In this embodiment, by setting the deformable part 40 on the connector or the second connecting piece 60, that is, on the extension structure of the first pole post 21, the deformable part 40 is inside the battery, so that it will not affect the pole post terminal structure outside the battery, will not occupy space outside, and will not affect the battery pack assembly.

[0073] In this embodiment, the specific positional relationship between the deformable member 40 and the third through hole 33 when the internal pressure of the battery is less than the preset value is not limited. It can extend into the third through hole 33 or not, as long as it does not contact the cover 10, it falls within the protection scope of this application. For example, when the internal pressure of the battery is less than the preset value, the deformable member 40 is located entirely inside the insulating member 30 near the electrode assembly 90.

[0074] Optionally, along the direction from the cover 10 to the insulator 30, for example along the X-axis, the orthographic projection of the deformable member 40 is located inside the third through hole 33. For example, the outer contour of the deformable member 40 is circular, and the radius of the third through hole 33 is not less than the radius of the deformable member 40. In this embodiment, the difficulty of contacting the deformable member 40 with the cover 10 can be reduced.

[0075] Optionally, when the deformable part 40 is in the initial state, at least a portion of the flipping part 42 forms an arc-shaped bend with an opening facing the cover 10; when the deformable part 40 is in the protected state, at least a portion of the flipping part 42 forms an arc-shaped bend with an opening away from the cover 10, which can reduce the difficulty of the flipping part 42 being subjected to force and flipping.

[0076] According to one embodiment of this application, the cover plate further includes a connector, which connects the deformable member 40 and the first pole post 21 respectively. That is, the deformable member 40 can be indirectly connected to the first pole post 21 via the connector. In this embodiment, the connector acts as a bridge, reducing the difficulty of connecting the deformable member 40 and the first pole post 21.

[0077] According to one embodiment of this application, the connector is located on the side of the cover 10 near the inside of the battery. The connector, for example, is located on the side of the insulating member 30 away from the cover 10, for example, the connector is located below the insulating member 30 in the X-axis direction. A deformable member 40 is provided on the connector, which is used to connect to the first terminal 21. For example, the connector is located at one end of the first terminal 21 near the inside of the battery, and the deformable member 40 is also provided on the connector. In this embodiment, the deformable member 40 can be provided on the connector, which can reduce the space occupied by the deformable member 40. Optionally, one end of the connector in the Z-axis direction is connected to the end of the first terminal 21 in the X-axis direction, and the deformable member 40 is provided in the middle of the connector or in the region near the other end in the Z-axis direction, which can reduce the size of the battery in the Z-axis direction.

[0078] In some specific embodiments of this application, the connector includes: a first connecting piece 50 and a second connecting piece 60. The first connecting piece 50 is used to connect to the first pole post 21. For example, the first connecting piece 50 is located on the side of the insulating member 30 away from the cover 10. The second connecting piece 60 is connected to the first connecting piece 50. For example, the second connecting piece 60 and the first connecting piece 50 are located on the same side of the insulating member 30. A deformable member 40 is provided on the second connecting piece 60. For example, the second connecting piece 60 is a rectangular plate with a circular through hole in it, and the deformable member 40 is disposed in the circular through hole. As another example, the second connecting piece 60 is located above the left end of the first connecting piece 50. The second connecting piece 60 and the first connecting piece 50 are stamped as a single piece, and the upper surface of the right end of the first connecting piece 50 is connected to the lower end of the first pole post 21. For example, the second connecting piece 60 is located to the left of the first connecting piece 50, the right end of the second connecting piece 60 is connected to the left end of the first connecting piece 50, the upper surface of the middle part of the first connecting piece 50 is connected to the lower end of the first pole post 21, and the first connecting piece 50 and the second connecting piece 60 are welded together.

[0079] According to one embodiment of this application, the first connecting piece 50 is provided with a first step structure 51, and the first pole post 21 is mounted on the first step structure 51 and welded to the first connecting piece 50, for example, the first pole post 21 is welded to the step surface or the outer side of the end of the first step structure 51. Alternatively, the second connecting piece 60 is provided with a second step structure 61, and the deformable member 40 is disposed on the second step structure 61 and welded to the second connecting piece 60, for example, the deformable member 40 is welded to the step surface or the outer side of the end of the second step structure 61. Alternatively, the second connecting piece 60 is provided with a third step structure 62, and the first connecting piece 50 is disposed on the third step structure 62 and welded to the second connecting piece 60, for example, as... Figure 12As shown, the second connecting piece 60 has a through hole in the middle, and a second step structure 61 is provided on the inner wall of the through hole. A third step structure 62 is provided at the right end of the second connecting piece 60. The left end of the first connecting piece 50, located at the right end of the second connecting piece 60, is installed on the third step structure 62. The first connecting piece 50 and the negative electrode post are stamped as a single piece. For example, as... Figure 13 As shown, the first connecting piece 50 and the second connecting piece 60 are stamped as a single unit. A first step structure 51 is provided at a corresponding position on the first connecting piece 50, and the first step structure 51 is welded to the negative electrode post. A second step structure 61 is provided at a corresponding position on the second connecting piece 60, and the second step structure 61 is welded to the deformable part 40. In this embodiment, by using a step structure connection and welding at the weld seam, the welding can be made more robust.

[0080] Optionally, the second connecting piece 60 is a rectangular plate structure with a circular through hole in it. The inner wall of the circular through hole is provided with a stepped structure, which constitutes the second step structure 61. The stepped surface of the second step structure 61 can be used to install the connecting part 41 of the deformable part 40. For example, the connecting part 41 can be welded to the periphery of the circular through hole at the weld position.

[0081] In other words, the connector in this embodiment mainly consists of a first connecting piece 50 and a second connecting piece 60. The first connecting piece 50 and the second connecting piece 60 can be simultaneously located on the side of the insulating member 30 away from the cover 10, for example, below the insulating member 30. The first connecting piece 50 can be connected to the first pole post 21, for example, directly. A deformable member 40 is mounted or provided on the second connecting piece 60, and the second connecting piece 60 can function as a mounting carrier or extension block. The second connecting piece 60 is also connected to the first connecting piece 50, and can simultaneously achieve indirect connection and serve as a mounting carrier. Furthermore, the insulating member 30 can be located between the first connecting piece 50 and the cover 10, providing insulation and circuit breaking under normal operating conditions. Simultaneously, by using sheet-like first connecting pieces 50 and 60, their thickness can be reduced, for example, in the X-direction, thus reducing the occupied volume. In addition, the second connecting piece 60 can function as an extension piece, for example, extending in the Z-axis direction, preventing interference between the deformable member 40 and the first pole post 21, and facilitating the installation of the deformable member 40.

[0082] Optionally, one end of the first connecting piece 50 in the Z-axis direction is connected to the end of the first pole post 21 in the X-axis direction, and the other end of the first connecting piece 50 in the Z-axis direction is connected to one end of the second connecting piece 60 in the Z-axis direction. The deformable member 40 is disposed on the second connecting piece 60 and extends approximately along the X-axis direction. By adopting a sheet-like structure, the space occupied by the connecting piece and the deformable member 40 in the X-axis direction can be reduced. By adopting the second connecting piece 60, it is beneficial for the deformable member 40 to be deformed under force.

[0083] The following detailed description of the short circuit when the deformed part 40 of this application contacts the cover 10, with reference to specific embodiments, is provided below.

[0084] The current path under short circuit is: positive terminal post — cover 10 (aluminum sheet) — deformable part 40 — second connecting piece 60 — first connecting piece 50 — negative terminal post. Since the electrochemical resistance of the electrode assembly inside the cell is larger than the ohmic resistance of the structural parts, the current preferentially passes through the low resistance current shunt, which can shield the further electrochemical reaction of the electrode assembly 90 inside the cell and improve safety.

[0085] According to one embodiment of this application, the second connecting piece 60 is welded to the first connecting piece 50, for example, one end of the second connecting piece 60 in the Z-axis direction is welded to one end of the first connecting piece 50 in the Z-axis direction; or, the second connecting piece 60 and the first connecting piece 50 are integral parts. For example, the first electrode post 21, the first connecting piece 50, and the second connecting piece 60 are integrally formed by stamping, or the first electrode post 21 and the first connecting piece 50 are integral parts, and the second connecting piece 60 is welded to the first connecting piece 50 to form an electrical connection path. It can be seen that the connection methods of the second connecting piece 60 and the first connecting piece 50 are diverse and can be manufactured using different processes. For example, the negative electrode post, the first connecting piece 50, and the second connecting piece 60 can be formed by stamping in one step, which can make the structure more robust; or, the negative electrode post and the first connecting piece 50 can be formed by stamping in one step, and the second connecting piece 60 and the first connecting piece 50 can be welded together, improving the structural strength. Optionally, when the first terminal 21 is a negative terminal, the second connecting piece 60 can be directly connected to the negative tab of the electrode assembly 90 inside the battery.

[0086] Optionally, the second connecting piece 60 has space to accommodate the welding assembly of the deformable part 40, which facilitates the assembly between the deformable part 40 and the second connecting piece 60.

[0087] Optionally, the cover 10 has a groove 13 on the side near the insulating member 30, for example, the cover 10 has a groove 13 on the inner side in the X-axis direction. When the other end of the deformable member 40 passes through the third through hole 33 and contacts the cover 10, the groove 13 accommodates the other end of the deformable member 40. That is, the inner side of the cover 10 has a groove 13 that is recessed in the thickness direction, for example, the opening of the groove 13 faces downward. When the other end of the deformable member 40 passes through the third through hole 33 under pressure and contacts the cover 10, the groove 13 can accommodate the other end of the deformable member 40, for example, the protrusion 43 of the deformable member 40 moves upward and enters the groove 13. In this embodiment, the side of the cover 10 facing the internal electrode assembly 90 of the battery is also provided with a groove 13. The groove 13 can serve as a receiving groove for the protrusion 43. When the internal air pressure of the battery increases, the deformable member 40 will deform and move towards the cover 10. The protrusion 43 passes through the third through hole 33 on the insulating member 30 and then contacts the inner wall of the groove 13.

[0088] Optionally, the cover 10 may also be equipped with an explosion-proof valve and / or a liquid injection port, which is highly integrated.

[0089] Optionally, the upper part of the positive electrode post is further provided with a positive electrode upper plastic 71, which can be the upper part in the X-axis direction. The positive electrode upper plastic 71 and the positive electrode adapter 75 can snap the positive electrode post into the second through hole 32 of the cover 10 and the insulating member 30 to fix the positive electrode post. Similarly, the upper part of the negative electrode post is provided with a negative electrode upper plastic 72. The negative electrode upper plastic 72 and the first connecting piece 50 can snap the negative electrode post into the first through hole 31 of the cover 10 and the insulating member 30 to fix the negative electrode post. Optionally, when the negative electrode post corresponds to the first through hole 31, a groove structure 13 is provided around the first through hole 31, and the corresponding position of the negative electrode upper plastic 72 has a concave-convex structure. This structure can further strengthen the fixation between the negative electrode post and the cover 10.

[0090] In other words, the electrode body passes through the electrode hole of the cover 10, the connecting block of the electrode is set on the side of the insulating member 30 near the electrode assembly 90, and the electrode is provided with upper plastic on the end near the cover 10. The electrode can be snapped into the plate-like structure composed of the insulating member 30 and the cover 10 through the upper plastic and the connecting block, for example, fixing the electrode in the X-axis direction.

[0091] Optionally, the insulating component 30 is provided with a filter structure at the position corresponding to the injection hole, which can be used to prevent the electrode assembly 90 from being damaged by excessively fast injection speed.

[0092] Optionally, the insulating component 30 is provided with a lower protrusion structure at a position corresponding to the cover 10. The lower protrusion structure is a hollow structure used to form a gas passage between the inside of the battery and the explosion-proof valve.

[0093] According to one embodiment of this application, the first terminal 21 is a negative terminal and the second terminal 22 is a positive terminal, which can be applied to a battery.

[0094] In some specific embodiments of this application, the cover 10, the negative terminal post, and the deformable part 40 are made of the same material, which can improve the reliability of the connection.

[0095] Optionally, the cover 10 is provided with a recessed structure around the first mounting hole 11 and / or the second mounting hole 12, and the pole post has corresponding protrusions and recesses. This structure makes the connection between the pole post and the cover 10 more secure.

[0096] This application also discloses a battery, including: a housing 80, a cover plate and an electrode assembly 90, wherein the cover plate is the cover plate of any of the above embodiments, and a receiving space is enclosed between the housing 80 and the cover body 10 of the cover plate, the electrode assembly 90 is located in the receiving space, and the electrode assembly 90 has two tabs, the two tabs being connected to the first terminal 21 and the second terminal 22 respectively through adapter pieces.

[0097] For example, a sodium-ion single-cell battery includes a casing 80, a cover plate, and an electrode assembly 90. The casing 80 is an aluminum casing, optionally formed by stretching and having a semi-closed opening. The cover plate includes a cover body 10 and an insulating member 30. The cover body 10 can be placed over the opening of the aluminum casing to seal the battery casing 80. The electrode assembly 90 is housed within the aluminum casing. The electrode assembly 90 includes multiple cores formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet includes a positive electrode active material, which can be selected from one or more of layered oxides, polyanionic compounds, and Prussian blue compounds. The negative electrode sheet includes a negative electrode active material, which can be selected from one or more of hard carbon and soft carbon. Since layered oxide positive electrodes have a high theoretical specific capacity and an open layered structure, and hard carbon has high specific capacity and good sodium storage performance, the batteries in this embodiment have high energy density and good rate performance; therefore, hard carbon is preferred.

[0098] According to one embodiment of this application, layered oxide is used as the positive electrode material. Layered oxide has a large gas production and slightly lower stability. When the battery is continuously producing gas during the cycle, it will cause changes in the gas pressure inside the battery. When the gas pressure inside the battery increases, the flipping part 42 will deform. The flipping part 42 will move towards the cover 10, and the protrusion 43 will pass through the third through hole 33 on the insulating member 30 and then contact the cover 10, causing a short circuit between the positive and negative electrodes.

[0099] In one embodiment of this application, the battery cover 10, negative electrode post, and deformable part 40 are made of the same material. For example, the negative electrode post can be made of aluminum, the first connecting piece 50 connected to the negative electrode post is also made of aluminum, and the second connecting piece 60 connected to the first connecting piece 50 and the deformable part 40 are also made of aluminum. In this case, the negative electrode post, the first connecting piece 50, the second connecting piece 60, and the flip piece are all made of the same material, which can improve the reliability of the welding connection. It should be noted that, compared with lithium batteries, lithium batteries require the use of copper electrode posts, etc., and cannot use aluminum as the negative electrode current collector. Therefore, when the battery in this embodiment is a sodium-ion battery, the cost of the structural components can be reduced.

[0100] Optionally, such as Figure 3 As shown, the battery also includes a positive electrode adapter 75. One side of the positive electrode adapter 75 is connected to the positive electrode connecting block 74 on the positive electrode post, and the other side is connected to the positive electrode tab of the electrode assembly 90. For example, in the X-axis direction, the upper surface of the positive electrode adapter 75 is connected to the positive electrode connecting block 74 on the positive electrode post, and the lower surface is connected to the positive electrode tab. The second connecting piece 60 is connected to the first connecting piece 50 and also to the negative electrode tab of the electrode assembly 90. This avoids occupying internal battery assembly space by using a separate connection structure. For example, one end of the second connecting piece 60 in the Z-axis direction is connected to the first connecting piece 50, and the other end of the second connecting piece 60 in the X-axis direction is connected to the negative electrode tab. In addition, the positive electrode adapter 75 is located on the side of the insulating member 30 closer to the inside of the battery, for example, located below the insulating member 30 in the X-axis direction.

[0101] The following detailed description uses the positive electrode adapter 75 in the adapter piece as an example, combined with a specific embodiment.

[0102] One side of the positive electrode adapter 75 is connected to the connecting block on the positive electrode post, and the other side is connected to the positive electrode tab of the electrode assembly 90. For example, in the X-axis direction, the upper surface of the positive electrode adapter 75 is connected to the connecting block on the positive electrode post, and the lower surface is connected to the positive electrode tab. In addition, the positive electrode adapter 75 is located on the side of the insulating member 30 closer to the inside of the battery, for example, located below the insulating member 30 in the X-axis direction.

[0103] Optionally, a sealing ring 73 is also provided between the positive terminal and the cover 10 for sealing. Optionally, a sealing ring 73 is also provided between the negative terminal and the cover 10 for sealing and insulation.

[0104] This application also discloses a battery, comprising: a housing 80, a cover plate, and an electrode assembly 90. The cover plate is the cover plate of any of the above embodiments. A receiving space is enclosed between the housing 80 and the cover body 10 of the cover plate. The electrode assembly 90 is located in the receiving space and has two tabs. The tab with the same polarity as the first terminal 21 is connected to the first terminal 21 through a connector, and the tab with the opposite polarity to the first terminal 21 is connected to the second terminal 22 through an adapter. For example, the second connecting piece 60 is connected to the first connecting piece 50 and also to the negative tab of the electrode assembly 90, which can avoid occupying the internal assembly space of the battery by setting up a separate connection structure. For example, one end of the second connecting piece 60 in the Z-axis direction is connected to the first connecting piece 50, and one end of the second connecting piece 60 in the X-axis direction is connected to the negative tab.

[0105] In summary, the deformable cover plate according to the embodiments of this application can not only achieve a small battery size design, but also improve the battery safety performance.

[0106] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A deformable part (40) for a cover plate, characterized in that, include: A connecting part (41) is used for electrical connection with the first pole (21) of the cover plate, and the connecting part (41) is an annular part; The flipping part (42) is a ring-shaped part. The outer periphery of the flipping part (42) is connected to the inner periphery of the connecting part (41). The flipping part (42) can be deformed to allow the deformable part (40) to switch between an initial state and a protected state. A protrusion (43) is provided on the inner periphery of the flipping part (42); When the deformable part (40) is in the initial state, the inner periphery of the flipping part (42) extends toward the cover body (10) away from the cover plate, and the end of the protrusion (43) near the cover body (10) does not extend beyond the end face of the connecting part (41) near the cover body (10) and is spaced apart from the cover body (10). During the process of the internal pressure of the battery increasing to a preset value, the deformable part (40) switches from the initial state to the protective state, the inner periphery of the flipping part (42) extends toward the direction of the cover (10), and the end of the protrusion (43) near the cover (10) is electrically connected to the cover (10) so that the second pole (22) installed on the cover (10) and electrically connected to the cover (10) is short-circuited to the first pole (21) through the deformable part (40).

2. The deformable member (40) for the cover plate according to claim 1, characterized in that, When the deformable part (40) is in the protected state, the end of the protrusion (43) away from the cover (10) does not extend beyond the end face of the connecting part (41) away from the cover (10).

3. The deformable member (40) for the cover plate according to claim 1, characterized in that, The end of the protrusion (43) away from the cover (10) is a plane; and / or, the end of the protrusion (43) near the cover (10) is a plane; and / or, the protrusion (43) is a cylindrical part; and / or, the flipping part (42) is a ring part; and / or, the protrusion (43) is located at the center of the flipping part (42); and / or, the deformable part (40) is an integrally formed part.

4. A cover plate, characterized in that, include: The cover (10) is provided with a first mounting hole (11) and a second mounting hole (12). The first pole (21) and the second pole (22) are installed in the first mounting hole (11) and are insulated from the cover (10). The second pole (22) is installed in the second mounting hole (12) and is electrically connected to the cover (10). The first pole (21) and the second pole (22) have opposite polarities. According to any one of claims 1-3, the deformable part (40) is disposed on the side of the cover (10) near the inside of the battery and is electrically connected to the first pole post (21).

5. The cover plate according to claim 4, characterized in that, Also includes: An insulating component (30) is located on the side of the cover (10) near the inside of the battery. The insulating component (30) is provided with a first through hole (31), a second through hole (32) and a third through hole (33). The first through hole (31) corresponds to the position of the first mounting hole (11) to install the first terminal (21). The second through hole (32) corresponds to the position of the second mounting hole (12) to install the second terminal (22). One end of the deformable component (40) is electrically connected to the first terminal (21), and the other end of the deformable component (40) corresponds to the position of the third through hole (33). When the deformable part (40) is in the initial state, the deformable part (40) is spaced apart from the cover (10). When the deformable part (40) is in the protected state, another end of the deformable part (40) passes through the third through hole (33) and contacts the cover (10) to form a short circuit.

6. The cover plate according to claim 4, characterized in that, Also includes: A connector is located on the side of the cover (10) near the inside of the battery, and the connector is provided with the deformable part (40). The connector is used to connect with the first pole post (21).

7. The cover plate according to claim 6, characterized in that, The connector includes: The first connecting piece (50) is used to connect with the first pole post (21); The second connecting piece (60) is connected to the first connecting piece (50), and the deformable part (40) is provided on the second connecting piece (60).

8. The cover plate according to claim 7, characterized in that, The first connecting piece (50) is provided with a first step structure (51), and the first pole post (21) is installed on the first step structure (51) and welded to the first connecting piece (50); Alternatively, the second connecting piece (60) is provided with a second step structure (61), and the deformable part (40) is provided on the second step structure (61) and welded to the second connecting piece (60); Alternatively, the second connecting piece (60) may have a third step structure (62), the first connecting piece (50) may be located on the third step structure (62) and welded to the second connecting piece (60).

9. A battery, characterized in that, include: The housing (80) and the cover plate, wherein the cover plate is any one of the cover plates described in claims 1-8, and a receiving space is enclosed between the housing (80) and the cover body (10) of the cover plate; Electrode assembly (90) is located in the receiving space. The electrode assembly (90) has two tabs, which are respectively connected to a first pole post (21) and a second pole post (22) via adapter pieces.

10. A battery, characterized in that, include: The housing (80) and the cover plate, wherein the cover plate is the cover plate according to any one of claims 6-8, and a receiving space is enclosed between the housing (80) and the cover body (10) of the cover plate; Electrode assembly (90) is located in the receiving space. The electrode assembly (90) has two tabs. The tab with the same polarity as the first pole post (21) is connected to the first pole post (21) through the connector. The tab with the opposite polarity to the first pole post (21) is connected to the second pole post (22) through an adapter.

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