Battery top cover structure
By introducing a limit structure and a current interrupt structure into the battery cover, the electrode assembly is ensured to accurately contact in extreme cases, and the problem of contact failure of the current interrupt structure is solved and the safety and stability of the battery is improved.
Patent Information
- Application Number
- CN202422319718.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-23
Smart Images
Figure CN223230419U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and further to a battery top cover structure. Background Art
[0002] In modern battery technology, especially lithium-ion batteries, safety is a primary design consideration. Abnormal conditions such as overcharging, internal short circuits, or external shocks can cause a sharp increase in internal pressure, increasing the risk of explosion or fire. To address this, battery manufacturers typically integrate a current interrupt device (CID) into the battery. This device, when detecting an increase in internal pressure, creates a short circuit and quickly cuts off the current, preventing further energy release and thermal runaway.
[0003] However, existing battery cover designs have limitations when used in extreme situations. When internal pressure in the battery is excessive, the cover may deform, increasing the gap between the connection terminals and the current-interrupting device. This deformation can prevent the current-interrupting device from making effective contact with the connection terminals, preventing a short circuit from forming and negating the protective effect of the CID. This not only reduces battery safety but also poses a potential safety threat to users and devices. Utility Model Content
[0004] In response to the above technical problems, the purpose of this application is to provide a battery top cover structure, which ensures that the protection function of the current interruption structure is realized and improves the safety performance of the battery by optimizing the design of the top cover structure.
[0005] In order to achieve the above objectives, the present application provides a battery top cover structure, comprising:
[0006] a first electrode assembly and a second electrode assembly;
[0007] The top cover body is provided with a first mounting position and a second mounting position, the first electrode assembly is fixed at the first mounting position, and the second electrode assembly is fixed at the second mounting position;
[0008] a current interruption structure, disposed inside the top cover body and adjacent to the first electrode assembly, for connecting with the first electrode assembly to form a short circuit when the internal pressure of the battery exceeds a reference pressure;
[0009] A limiting structure is arranged at the first mounting position and at least partially surrounds the first electrode assembly to limit the relative distance between the first electrode assembly and the current interruption structure, thereby preventing the first electrode assembly from deviating from a preset position when the internal pressure of the battery exceeds a reference pressure.
[0010] In some embodiments, the current interruption structure includes a flip sheet and a receiving seat, and the receiving seat is provided on the top cover body for supporting the flip sheet;
[0011] The flip sheet is arranged in the receiving seat and can flip or deform when the internal pressure of the battery exceeds the reference pressure so as to connect with the first electrode assembly.
[0012] In some embodiments, the first electrode assembly includes a first connecting terminal and a first pole, and the first connecting terminal is disposed at the first mounting position;
[0013] Among them, the first connecting terminal includes a connected contact segment and a welding segment. The contact segment is arranged corresponding to the flip plate and is used to contact the flip plate to form a short circuit when the internal pressure of the battery exceeds the reference pressure. The first pole penetrates the welding segment and the top cover body in the thickness direction and is fixedly connected to the welding segment.
[0014] In some embodiments, a groove is provided at the connection position between the contact segment and the welding segment, and an extension direction of the groove is consistent with a width direction of the contact segment, so as to provide a directional deformation area for the first connecting terminal.
[0015] In some embodiments, the first electrode assembly further includes a first insulating member and a second insulating member, wherein the first insulating member, the first connecting terminal, and the second insulating member are stacked in sequence, wherein a contour of the first insulating member matches a contour of the contact segment, and a contour of the second insulating member matches an overall contour of the first connecting terminal;
[0016] The second insulating member is provided with two through holes, the first pole passes through one of the through holes to be connected to the welding segment, and the other through hole is used to expose the contact surface between the contact segment and the flip sheet.
[0017] In some embodiments, an annular rib is provided on the edge of the second insulating member, and the height of the annular rib is at least equal to the thickness of the contact segment, so that the second insulating member and the first insulating member together form an outer protective structure of the contact segment, and the limiting structure at least partially covers the outer protective structure.
[0018] In some embodiments, the limiting structure includes a transverse partition and a longitudinal partition, the longitudinal partition is vertically connected to the surface of the top cover body, the contour of the transverse partition matches the contour of the longitudinal partition and is vertically connected to the free end of the longitudinal partition to form a continuous barrier, wherein part of the outer periphery of the first electrode assembly is respectively abutted against the transverse partition and the longitudinal partition.
[0019] In some embodiments, the transverse partition and the longitudinal partition both have a U-shaped profile.
[0020] In some embodiments, the second electrode assembly includes a second connecting terminal, a second electrode post, and a third insulating member;
[0021] The second connecting terminal and the third insulating member are both arranged at the second installation position, and the third insulating member is located between the second connecting terminal and the top cover body.
[0022] The second pole passes through the top cover body, the third insulating member and the second connecting terminal at the same time, and is fixedly connected to the second connecting terminal.
[0023] In some embodiments, the top cover body includes an upper cover plate and a lower base plate, the lower base plate is made of insulating material, and the upper cover plate and the lower base plate are stacked, the first mounting position and the second mounting position are set on the upper cover plate, and the current interruption structure is set on the lower base plate.
[0024] Compared with the prior art, the battery top cover structure provided by this application has the following beneficial effects:
[0025] 1. The design of the limiting structure restricts the movement of the first electrode assembly, ensuring that the electrode assembly will not deviate from the preset position when the internal pressure increases, so that the current interruption structure can accurately contact the electrode assembly when needed to form an effective short circuit.
[0026] 2. A groove is provided on the first connecting terminal. The groove design enables the first connecting terminal to deform in a predetermined direction when the internal pressure of the battery increases. This directional deformation helps the battery to release internal pressure through controllable deformation when it suffers from overcharge, short circuit or other abnormal conditions, thereby protecting the battery from damage.
[0027] 3. The edge of the second insulating member is provided with an annular rib, which significantly enhances the insulation protection of the contact segment, ensuring good electrical insulation between the contact segment and other components inside the battery during battery assembly and use, preventing accidental short circuits or arcing. The second insulating member and the first insulating member work together to form an outer protective structure for the contact segment, which can effectively improve the life of the top cover structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.
[0029] Figure 1 This is a schematic diagram of the overall exploded structure of an embodiment of the present application;
[0030] Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of the present application;
[0031] Figure 3 It is a partial diagram of an embodiment of the present application;
[0032] Figure 4 This is a schematic structural diagram of the first connecting terminal in one embodiment of the present application.
[0033] Explanation of the accompanying drawings: top cover body 1; upper cover plate 11; explosion-proof valve mounting hole 110; first mounting position 111; second mounting position 112; lower base plate 12; first electrode assembly 20; first connecting terminal 201; groove 2010; contact section 2011; welding section 2012; first insulating member 202; second insulating member 203; annular rib 2031; first pole 204; second electrode assembly 30; second connecting terminal 301; second pole 302; third insulating member 303; current interruption structure 40; flip plate 401; receiving seat 402; limiting structure 50; horizontal partition 501; longitudinal partition 502; explosion-proof valve 6. DETAILED DESCRIPTION
[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.
[0035] To simplify the drawings, only the portions relevant to the application are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."
[0036] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
[0037] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0039] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0040] With modern electronic devices increasingly demanding higher power performance, lithium-ion batteries have become the mainstream energy storage solution due to their superior performance. While these batteries offer advantages such as high energy density and long life, they also face safety challenges. In particular, abnormal operating conditions such as overcharging, internal short circuits, or mechanical damage can cause a sudden increase in internal pressure, increasing the risk of explosion or fire.
[0041] In order to improve the safety of batteries, the industry generally adopts the method of integrating a current interrupt device (CID) into the battery top cover. The purpose of the current interrupt structure is to quickly cut off the current by forming a short circuit in the circuit when abnormal internal pressure of the battery is detected, so as to prevent further energy release and thermal runaway. However, when the existing battery top cover structure responds to a sharp increase in internal pressure, the contact between the current interrupt structure and the connection terminal may fail due to deformation of the top cover. Such a design defect may prevent the current interrupt structure from taking effect in time, thereby reducing the safety performance of the battery.
[0042] Based on the above problems, the battery top cover structure provided in this application can ensure that the protection function of the current interruption structure is realized and improve the safety performance of the battery by optimizing the design of the top cover structure.
[0043] In one embodiment, the reference Figure 1 and Figure 2 The present application provides a battery top cover structure comprising a first electrode assembly 20 and a second electrode assembly 30, which are respectively fixed to a first mounting position 111 and a second mounting position 112 of a top cover body 1. The first electrode assembly 20 is adjacent to a current interruption structure 40, which is disposed within the top cover body 1 so as to connect with the first electrode assembly 20 when necessary to form a short circuit, thereby quickly cutting off the current and preventing the battery from overheating or explosion.
[0044] To ensure that the first electrode assembly 20 can accurately connect with the current interruption structure 40 when the internal pressure of the battery increases, in this embodiment, the battery top cover structure is further provided with a limiting structure 50. The limiting structure 50 is provided at the first mounting position 111 and at least partially surrounds the first electrode assembly 20, thereby limiting the movement of the first electrode assembly 20 under the action of the internal pressure of the battery.
[0045] This design ensures that even in extreme or abnormal circumstances, the first electrode assembly 20 will not deviate from its predetermined position, thereby ensuring that the current interruption structure 40 can promptly and effectively contact the first electrode assembly 20 to trigger a short circuit. Through physical constraints, the first electrode assembly 20 is prevented from displacement when the internal pressure of the battery changes, maintaining the precise alignment of the first electrode assembly 20 and the current interruption structure 40. Furthermore, the limiting structure 50 provides additional mechanical support for the first electrode assembly 20, enhancing the overall mechanical stability of the battery top cover. This support helps to resist displacement of the electrode assembly due to external factors such as temperature changes, mechanical shock, or vibration.
[0046] In one embodiment, based on the above embodiment, the top cover body 1 includes an upper cover plate 11 and a lower base plate 12. The lower base plate 12 is made of an insulating material, which not only provides the necessary electrical isolation but also helps protect the internal components of the battery from physical damage. The upper cover plate 11 and the lower base plate 12 are stacked, wherein the first mounting position 111 and the second mounting position 112 mentioned above are provided on the upper cover plate 11 for fixing the first electrode assembly 20 and the second electrode assembly 30, while the current interruption structure 40 is provided on the lower base plate 12.
[0047] It can be understood that in this embodiment, the top cover body 1 is composed of two independent parts, the upper cover plate 11 and the lower base plate 12. This split design can facilitate the respective molding processing, so that each component can adopt the molding process that best suits its material properties, without the need to compromise in order to adapt to the molding requirements of different materials, thereby improving the molding efficiency and component accuracy; on the other hand, it also provides great convenience in the battery assembly process. During the battery assembly process, the split design of the upper cover plate 11 and the lower base plate 12 can be more easily aligned and fixed with other battery components, simplifying the assembly process, reducing the possibility of assembly errors, and improving overall production efficiency.
[0048] Furthermore, as shown in the figure, the current interruption structure 40 includes a flip sheet 401 and a receiving seat 402. The receiving seat 402 is disposed on the top cover body 1 and its main function is to support the flip sheet 401. The flip sheet 401 is disposed within the receiving seat 402 and can flip or deform when the internal pressure of the battery exceeds a preset baseline pressure, causing the flip sheet 401 to contact the first electrode assembly 20, thereby triggering the current interruption mechanism.
[0049] It is understood that under normal battery operation, the flip plate 401 is stably supported by the receiving seat 402 and remains in its original position. When the pressure inside the battery increases and exceeds the safety threshold due to overcharging, short circuit, or other abnormal conditions, this increase in pressure causes the flip plate 401 to mechanically deform or flip, thereby contacting the first electrode assembly 20 and quickly interrupting the current.
[0050] Based on the above embodiments, in one embodiment, the first electrode assembly 20 includes a first connecting terminal 201 and a first pole 204. The first connecting terminal 201 is arranged at the first mounting position 111 and is responsible for forming a short circuit with the flip plate 401 in the current interruption structure 40 under specific conditions.
[0051] like Figure 4 As shown, the first connection terminal 201 is further subdivided into a contact segment 2011 and a welding segment 2012, wherein the contact segment 2011 is arranged corresponding to the flip piece 401, and is used to contact it when the internal pressure of the battery exceeds the preset reference pressure, triggering the short-circuit mechanism, and the first pole 204 passes through the welding segment 2012 and the top cover body 1 in the thickness direction, and is fixedly connected to the welding segment 2012.
[0052] In this embodiment, when the battery is operating normally, contact segment 2011 and flip plate 401 maintain a certain distance from each other, forming no electrical connection. When the internal pressure of the battery exceeds a safety threshold due to overcharging, a short circuit, or other abnormal conditions, flip plate 401 flips or deforms under the pressure, making contact with contact segment 2011 and forming a short circuit. This triggers the current interruption mechanism, cutting off the current and preventing further damage to the battery.
[0053] At the same time, the fixed connection between the first pole 204 and the welding section 2012 ensures the mechanical stability of the electrode assembly, and maintains the structural integrity even when the internal pressure or temperature of the battery fluctuates.
[0054] Optionally, a material with good elasticity and strength may be selected to manufacture the first connection terminal 201 to improve its deformation capability under pressure and overall durability.
[0055] Based on the above embodiment, a groove 2010 is provided at the connection position between the contact segment 2011 and the welding segment 2012. The extension direction of the groove 2010 is consistent with the width direction of the contact segment 2011. The design of this groove 2010 is to provide a directional deformation area to adapt to the deformation requirements of the first connecting terminal 201 when the internal pressure of the battery changes.
[0056] For details, please see the attached manual. Figure 4 By providing a groove 2010 at a predetermined position on the first connection terminal 201, the contact segment 2011 of the first connection terminal 201 can preferentially deform at the position of the groove 2010 under the internal pressure of the battery. It can be understood that with this arrangement, the contact segment 2011 can deform in a controlled manner under pressure, rather than randomly deforming under uncontrolled conditions. This helps the battery relieve internal pressure in abnormal situations through the orderly deformation of the first connection terminal 201.
[0057] In one embodiment, Figure 1 and Figure 3 As shown, the first electrode assembly 20 also includes a first insulating member 202 and a second insulating member 203. The first connecting terminal 201 is located between the two insulating members in a stacked arrangement. Specifically, the first insulating member 202 is located above the first connecting terminal 201, and the second insulating member 203 is located below the first connecting terminal 201 to provide necessary electrical insulation.
[0058] The contour of the first insulating member 202 matches that of the contact segment 2011, protecting it from external interference. The contour of the second insulating member 203 matches the overall contour of the first connection terminal 201, ensuring the structural integrity and stability of the entire electrode assembly. The second insulating member 203 has two through-holes: one for the first terminal 204 to pass through and connect to the welding segment 2012; the other exposes the contact surface between the contact segment 2011 and the flip plate 401, allowing for a short circuit when needed.
[0059] Among them, the first insulating member 202 is located above the first connecting terminal 201 and directly contacts the upper surface of the contact segment 2011, providing upper insulation protection for the contact segment 2011, ensuring that the contact segment 2011 will not make electrical contact with other conductive components of the top cover under normal operation or abnormal conditions. In other words, the provision of the first insulating member 202 can prevent the contact segment 2011 from short-circuiting due to accidental contact during battery assembly or use, and also protect the contact segment 2011 from physical damage or environmental pollution.
[0060] The second insulating member 203 is located below the first connecting terminal 201 and provides lower insulating support for the entire first connecting terminal 201 , ensuring that the insulating member can fully cover the bottom of the first connecting terminal 201 and provide comprehensive insulation protection.
[0061] Furthermore, an annular rib 2031 is provided on the edge of the second insulating member 203, fully covering the outer periphery and bottom of the first connecting terminal 201. The height of the annular rib 2031 is at least equal to the thickness of the contact segment 2011. This design not only provides necessary physical protection for the contact segment 2011 but also, together with the first insulating member 202, forms the outer insulation structure of the contact segment 2011, thereby forming a reliable insulation barrier inside the battery top cover. Furthermore, when the internal pressure of the battery increases, the annular rib 2031 helps maintain the position of the contact segment 2011, ensuring that the contact surface of the contact segment 2011 remains aligned with the flip plate 401 until a short circuit is required to interrupt the current.
[0062] In this embodiment, the annular rib 2031 is effective in providing comprehensive insulation protection for the first connecting terminal 201 and structural reinforcement within the battery cover. The annular rib 2031 not only prevents deformation or damage to the first connecting terminal 201 under mechanical stress but also provides a certain auxiliary limiting function, ensuring that when abnormal internal battery pressure occurs, the contact segment 2011 can accurately contact the flip plate 401, triggering the current interruption mechanism. Furthermore, the annular rib 2031 works in conjunction with the limiting structure 50 to provide additional mechanical support for the battery cover, enhancing its overall stability and durability.
[0063] In one embodiment, based on the above embodiment, the retaining structure 50 includes a transverse partition 501 and a longitudinal partition 502, forming a continuous barrier. The longitudinal partition 502 is vertically connected to the surface of the top cover body 1. The transverse partition 501 has a profile that matches the profile of the longitudinal partition 502 and is vertically connected to the free end of the longitudinal partition 502 to provide stable support for the first electrode assembly 20.
[0064] Specifically, as shown in the accompanying drawings, the limiting structure 50 physically blocks the displacement of the first electrode assembly 20 when the internal pressure of the battery changes. The combination of the transverse partitions 501 and the longitudinal partitions 502 forms a frame that abuts against a portion of the outer periphery of the first electrode assembly 20, improving the mechanical stability of the battery top cover and ensuring that the first electrode assembly 20 does not move when the internal pressure of the battery is abnormal. This ensures that the current interruption structure 40 can accurately contact the contact segment 2011 of the first electrode assembly 20, triggering a short circuit and achieving rapid current interruption.
[0065] In the accompanying drawings, it can be seen that both the transverse partition 501 and the longitudinal partition 502 are designed to have a "U"-shaped profile. This design enables the limiting structure 50 to form a semi-annular profile as a whole, which precisely corresponds to the outer periphery of the contact segment 2011.
[0066] The "U"-shaped contour design of the limiting structure 50 enables it to fit tightly against the periphery of the contact segment 2011, thereby limiting the displacement of the contact segment 2011 when the internal pressure of the battery changes. This semi-annular limiting structure 50 not only provides stable physical support, but also ensures the correct alignment between the contact segment 2011 and the flip plate 401.
[0067] In one embodiment, based on the above embodiment, Figure 1 and Figure 2 As shown, the second electrode assembly 30 includes a second connection terminal 301, a second pole 302, and a third insulating member 303. The second connection terminal 301 and the third insulating member 303 are both arranged in the second mounting position 112, ensuring the compactness of the assembly and the effective use of space. The third insulating member 303 is located between the second connection terminal 301 and the top cover body 1, providing the necessary electrical isolation for the second connection terminal 301 and preventing accidental short circuits to a certain extent. The second pole 302 simultaneously passes through the top cover body 1, the third insulating member 303, and the second connection terminal 301, and is fixedly connected to the second connection terminal 301.
[0068] It should be noted that in this application, the two electrode assemblies support two polarity configurations. Specifically, the second electrode assembly 30 is designated as the positive electrode assembly, while the first electrode assembly 20 serves as the negative electrode assembly. In this configuration, the current interruption structure 40 cooperates with the negative electrode terminal to form a short circuit when the internal pressure of the battery exceeds a safety threshold, thereby quickly interrupting the current and ensuring battery safety.
[0069] However, the design of this application is not limited to a single polarity configuration. In different battery designs or application scenarios, the second electrode assembly 30 can serve as the negative electrode assembly, while the first electrode assembly 20 serves as the positive electrode assembly. In this case, the current interruption structure 40 will cooperate with the positive electrode terminal to achieve the same safety protection function.
[0070] Furthermore, Figure 1 As shown, the battery top cover structure is also provided with an explosion-proof valve 6, wherein an explosion-proof valve mounting hole 110 is provided on the upper cover plate 11 for mounting the explosion-proof valve 6, so that the explosion-proof valve 6 is integrated with the battery top cover structure, further improving the safety performance of the battery, ensuring that the pressure can be safely released when the internal pressure of the battery increases abnormally, and preventing the battery from exploding or catching fire. Specifically, when the pressure inside the battery increases due to overcharging, internal short circuit or other abnormal conditions, the explosion-proof valve 6 in the explosion-proof valve mounting hole 110 will sense the pressure change. Once the internal pressure reaches the preset opening pressure, the explosion-proof valve 6 will automatically open, forming a pressure release channel, thereby quickly reducing the pressure inside the battery and preventing the battery shell from rupturing or more serious safety accidents.
[0071] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be noted that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be considered as the scope of protection of the present application.
Claims
1. A battery top cover structure, characterized in that: include: a first electrode assembly and a second electrode assembly; The top cover body is provided with a first mounting position and a second mounting position, the first electrode assembly is fixed at the first mounting position, and the second electrode assembly is fixed at the second mounting position; a current interruption structure, disposed inside the top cover body and adjacent to the first electrode assembly, for connecting with the first electrode assembly to form a short circuit when the internal pressure of the battery exceeds a reference pressure; A limiting structure is arranged at the first mounting position and at least partially surrounds the first electrode assembly to limit the relative distance between the first electrode assembly and the current interruption structure, thereby preventing the first electrode assembly from deviating from a preset position when the internal pressure of the battery exceeds a reference pressure.
2. The battery top cover structure according to claim 1, characterized in that: The current interruption structure includes a flip sheet and a receiving seat, wherein the receiving seat is provided on the top cover body for supporting the flip sheet; The flip sheet is arranged in the receiving seat and can flip or deform when the internal pressure of the battery exceeds the reference pressure so as to connect with the first electrode assembly.
3. The battery top cover structure according to claim 2, characterized in that: The first electrode assembly includes a first connecting terminal and a first pole, and the first connecting terminal is arranged at the first installation position; Among them, the first connecting terminal includes a connected contact segment and a welding segment. The contact segment is arranged corresponding to the flip plate and is used to contact the flip plate to form a short circuit when the internal pressure of the battery exceeds the reference pressure. The first pole penetrates the welding segment and the top cover body in the thickness direction and is fixedly connected to the welding segment.
4. The battery top cover structure according to claim 3, characterized in that: A groove is provided at the connection position between the contact segment and the welding segment. The extending direction of the groove is consistent with the width direction of the contact segment, and is used to provide a directional deformation area for the first connecting terminal.
5. The battery top cover structure according to claim 3, characterized in that: The first electrode assembly further includes a first insulating member and a second insulating member, wherein the first insulating member, the first connecting terminal, and the second insulating member are stacked in sequence, wherein a contour of the first insulating member matches a contour of the contact segment, and a contour of the second insulating member matches an overall contour of the first connecting terminal; The second insulating member is provided with two through holes, the first pole passes through one of the through holes to be connected to the welding segment, and the other through hole is used to expose the contact surface between the contact segment and the flip sheet.
6. The battery top cover structure according to claim 5, characterized in that: The edge of the second insulating member is provided with an annular rib, the height of which is at least equal to the thickness of the contact segment, so that the second insulating member and the first insulating member together form an outer protective structure of the contact segment, and the limiting structure at least partially covers the outer protective structure.
7. The battery top cover structure according to any one of claims 1 to 6, characterized in that: The limiting structure includes a transverse partition and a longitudinal partition, the longitudinal partition is vertically connected to the surface of the top cover body, the contour of the transverse partition matches the contour of the longitudinal partition and is vertically connected to the free end of the longitudinal partition to form a continuous barrier, wherein part of the outer periphery of the first electrode assembly is respectively in contact with the transverse partition and the longitudinal partition.
8. The battery top cover structure according to claim 7, characterized in that: The transverse partition and the longitudinal partition both have a U-shaped profile.
9. The battery top cover structure according to claim 1, characterized in that: The second electrode assembly includes a second connecting terminal, a second pole and a third insulating member; The second connecting terminal and the third insulating member are both arranged at the second installation position, and the third insulating member is located between the second connecting terminal and the top cover body. The second pole passes through the top cover body, the third insulating member and the second connecting terminal at the same time, and is fixedly connected to the second connecting terminal.
10. The battery top cover structure according to any one of claims 1-6, 8, and 9, characterized in that: The top cover body includes an upper cover plate and a lower base plate, the lower base plate is made of insulating material, and the upper cover plate and the lower base plate are stacked, the first mounting position and the second mounting position are set on the upper cover plate, and the current interruption structure is set on the lower base plate.