Battery cover plate structure, battery and electric device

Abstract

The application provides a battery cover plate structure, a battery and an electric device, and relates to the technical field of batteries. The battery cover plate structure comprises a pole, a cover plate assembly and an insulation assembly. The cover plate assembly comprises a metal structural piece. The insulation assembly comprises an insulation piece and a conducting piece. The insulation piece is arranged between the pole and the metal structural piece. A local area of the insulation piece is provided with the conducting piece. The conducting piece connects the pole and the metal structural piece, and the conducting piece can be fused. The pole assembly of the embodiment is electrically connected to the metal structural piece through the conducting piece, so that the pole and the metal structural piece are in the same potential, thereby helping to shorten the voltage measurement distance between the positive pole and the negative pole of the battery. When collecting the voltage of the battery with a long distance between the positive pole and the negative pole, the voltage between the pole and the battery cover plate is measured at one of the poles, and the voltage of the battery can be measured, thereby effectively reducing the difficulty of voltage collection.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cover structure, a battery, and an electrical device. Background Technology

[0002] Power batteries are the core component of new energy vehicles and also the power source for them.

[0003] Currently, batteries need to use voltage acquisition devices to collect voltage data in order to effectively determine the battery's state of charge and health, thereby ensuring the battery's lifespan and safety.

[0004] However, in related technologies, the positive and negative terminals of the battery are spatially far apart, which makes voltage acquisition inconvenient. Utility Model Content

[0005] This application provides a battery cover structure, a battery, and an electrical device to solve the technical problem that the positive and negative terminals of a battery are far apart in spatial layout, making voltage acquisition inconvenient.

[0006] In a first aspect, this application provides a battery cover structure, comprising:

[0007] pole;

[0008] Cover plate assembly, including metal structural components;

[0009] An insulating component includes an insulating element and a conductive element. The insulating element is disposed between the pole and the metal structural component. The conductive element is provided in a local area of ​​the insulating element. The conductive element connects the pole and the metal structural component and is fusible.

[0010] The battery cover structure provided in this application provides an electrical connection between the terminals and the metal structural component via a conductive element, enabling the terminals and the metal structural component to achieve equipotentiality. When the terminal is a positive terminal, since the positive terminal and the metal structural component are at equipotential, and the metal structural component is the main structure of the cover assembly, when collecting voltage data for batteries where the positive and negative terminals are far apart, only the voltage between the negative terminal and the metal structural component needs to be measured. This shortens the voltage measurement distance between the positive and negative terminals, effectively reducing the difficulty of voltage acquisition and facilitating timely monitoring of the battery voltage. Furthermore, by placing the conductive element in a localized area of ​​the insulating component, this embodiment reduces the external space occupied by the conductive element, thereby improving the compactness of the battery cover structure. Simultaneously, this embodiment uses a fusible conductive element to disconnect the electrical connection between the terminals and the metal structural component. When the battery casing accidentally comes into contact with an external circuit, connecting the terminals to the external circuit, the electrical connection between the terminals and the external circuit can be broken, thus preventing the battery casing from rapidly heating up due to excessive current and helping to ensure the normal use of the battery.

[0011] In one possible implementation, the conductive element includes a first end, a second end, and a conductive portion. The first end is disposed on the side of the insulating element facing the pole post to connect to the pole post; the second end is disposed on the side of the insulating element facing the metal structural member to connect to the metal structural member.

[0012] The conductive portion is disposed in a local area on the periphery of the insulating member to connect the first end and the second end.

[0013] In one possible implementation, the conductor is a flat metal structure.

[0014] In one possible implementation, the conductive portion includes a fusible portion, which is a curved, tapered section in the conductive portion, the width of which is smaller than the width of the first end and the second end.

[0015] And / or, the conductive portion includes a fusible portion and a metal plating layer, the metal plating layer covering the side of the fusible portion away from the insulating member, and the metal plating layer being configured to shorten the melting time of the connection body.

[0016] In one possible implementation, the melting point of the metal coating is lower than the melting point of the fusible portion, and the width of the metal coating is smaller than the width of the fusible portion.

[0017] In one possible implementation, the first end of the conductive portion is connected to the first end, and the second end of the conductive portion is connected to the second end.

[0018] The conductive element also includes a fusible fuse, which is pre-installed on the periphery of the insulating element to connect the first end and the second end of the conductive element.

[0019] In one possible implementation, the insulating member has a limiting portion on its periphery, and a portion of the conductive member is disposed on the limiting portion, the limiting portion being a protrusion or groove on the periphery of the insulating member.

[0020] In one possible implementation, the metal structural component is a battery cover plate with mounting holes. The insulating component has an assembly portion on the side facing the battery cover plate, and the assembly portion is disposed in the mounting holes. The insulating component also has a mounting groove on the side facing the terminal post, and the terminal post is disposed in the mounting groove and connected to the assembly portion and the battery cover plate.

[0021] One end of the conductive element extends into the mounting groove and connects to the terminal post, while the other end of the conductive element extends to the side of the insulating element facing the battery cover to connect to the battery cover.

[0022] In one possible implementation, the insulating element is a plastic separator sandwiched between the terminal post and the battery cover.

[0023] In one possible implementation, the cover assembly further includes a battery cover, and the metal structural member is a metal ring installed within the battery cover;

[0024] The pole has an electrical connection portion and a mounting portion in the length direction. The mounting portion is sequentially inserted into the insulating member and the metal ring. The conductive member connects the electrical connection portion and the metal ring.

[0025] In one possible implementation, one end of the conductive element extends to the side of the insulating element facing the electrical connection portion and matches the shape of the insulating element to connect the electrical connection portion;

[0026] The other end of the conductive element extends to the side of the insulating element facing the metal ring and matches the shape of the metal ring to connect the metal ring.

[0027] In one possible implementation, the conductor has a conductive portion, and the melting point of the conductor at both ends is greater than the melting point of the conductive portion.

[0028] In one possible implementation, the battery cover structure includes a positive electrode cover; and / or, the conductive element is a metal coating on the insulating element.

[0029] Secondly, this application also provides a battery, comprising:

[0030] Battery casing;

[0031] The aforementioned battery cover structure is disposed on the battery casing.

[0032] The battery provided in this application has the aforementioned battery cover structure, which shortens the battery voltage measurement distance and facilitates the acquisition of battery voltage by the voltage acquisition device.

[0033] Thirdly, this application also provides an electrical appliance, comprising:

[0034] The device body, which includes an installation compartment,

[0035] The aforementioned battery is disposed within the mounting compartment.

[0036] The electrical device provided in this application has the aforementioned battery, and therefore has the same effect as the battery, thereby improving the safety of both the battery and the electrical device. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the first battery cover structure provided in the embodiments of this application;

[0039] Figure 2 for Figure 1 A schematic diagram of the unfolded shape;

[0040] Figure 3 for Figure 1 Cross-sectional view;

[0041] Figure 4 This is a schematic diagram of the insulating component structure of the battery cover structure provided in the embodiments of this application;

[0042] Figure 5 for Figure 4 A schematic diagram of the bottom side structure of the middle insulation component;

[0043] Figure 6 for Figure 5 Front view of the central insulation component;

[0044] Figure 7 A schematic diagram of the conductive part structure of the first type of conductive element provided in the embodiments of this application;

[0045] Figure 8 A schematic diagram of the conductive part structure of the second type of conductive element provided in the embodiments of this application;

[0046] Figure 9 A schematic diagram of the conductive part structure of the third type of conductive element provided in the embodiments of this application;

[0047] Figure 10 A schematic diagram of an insulating element provided in an embodiment of this application;

[0048] Figure 11 A schematic diagram of another insulating component provided in an embodiment of this application;

[0049] Figure 12 A schematic diagram of the second battery cover structure provided in the application embodiment;

[0050] Figure 13 A schematic diagram of the second battery cover structure provided in the application embodiment from another perspective;

[0051] Figure 14 This is a schematic diagram showing the unfolded insulating components and terminals in the second battery cover structure provided in the application embodiment.

[0052] Figure label:

[0053] 100 - Pole post; 110 - Electrical connection part; 120 - Mounting part;

[0054] 200 - Cover plate assembly; 210 - Metal structural component; 211 - Mounting hole; 220 - Metal ring;

[0055] 300 - Insulating component; 310 - Insulating element; 311 - Mounting groove; 312 - Assembly part; 313 - Protrusion; 314 - Groove; 320 - Conducting element; 321 - First end; 322 - Second end; 323 - Conductive part; 324 - Fusible part; 325 - Metal plating. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0057] This application provides an electrical device, which can be a vehicle, such as a sedan, bus, or truck. For example, the vehicle can be an electric vehicle, a pure electric vehicle, a hybrid electric vehicle, a range-extended electric vehicle, a plug-in hybrid electric vehicle, a new energy vehicle, or any vehicle equipped with a battery.

[0058] The following explanation uses a vehicle as an example of an electrical appliance.

[0059] The vehicle may also include a body, a motor, and a battery pack, wherein the electronic control components, battery pack, axles, and motor can all be mounted on the body. The battery pack can be electrically connected to the motor, and the motor can be connected to the axles. The battery pack supplies power to the motor, enabling it to rotate, which in turn drives the axles, thus allowing the vehicle to move. The vehicle may also have other electrical components, and the battery pack can supply power to these other components as well.

[0060] A battery pack can include multiple batteries, which are the core energy storage units of the pack, typically lithium-ion or nickel-metal hydride batteries. Multiple batteries can be connected in series or parallel to form battery modules to meet the vehicle's power requirements. A battery can include a battery casing, a battery cover, and battery cells. The cells are housed inside the battery casing, and the battery cover is placed over the casing to seal and protect the cells. The battery cover and battery casing are usually made of metal.

[0061] Battery covers typically have terminals, which are the channels through which the battery charges and discharges. Electrical isolation between the terminals and the battery casing is achieved through insulating components to prevent direct conductivity between the terminals and the casing. The terminals include a positive terminal and a negative terminal. The positive terminal connects to the positive current collector inside the battery, and the negative terminal connects to the negative current collector inside the battery.

[0062] In voltage acquisition scenarios, battery voltage generally refers to the potential difference between the positive and negative terminals. Therefore, the voltage acquisition device needs to establish electrical connections with the positive and negative terminals respectively through connection terminals, and then transmit the potential difference signal through the acquisition line to measure the battery voltage.

[0063] As mentioned in the background section, in related technologies, the positive and negative terminals of the battery are spatially far apart. When collecting battery voltage, the connection terminals of the voltage acquisition device are limited by the length of the acquisition line, and the acquisition line needs to be lengthened to accommodate the long distance between the positive and negative terminals, which increases the difficulty of collecting voltage and is not conducive to timely monitoring of battery condition.

[0064] In addition, when the battery accidentally comes into contact with an external circuit, the battery casing and battery cover will form a closed circuit. Since the external circuit usually has low resistance, this closed circuit will generate a certain current. If the current is too large, the battery is prone to generating a lot of heat, which may pose a risk of fire or explosion.

[0065] Based on this, embodiments of this application provide a battery cover structure, a battery, and an electrical device to solve the aforementioned technical problems. Specifically, the terminal assembly provided in this application includes a terminal, an insulating component, a metal structural component, and a conductive component. The conductive component electrically connects the terminal to the battery cover, enabling the terminal and the battery cover to achieve equipotential. This helps to shorten the voltage measurement distance between the positive and negative terminals of the battery, thereby reducing the difficulty of voltage acquisition for batteries where the positive and negative terminals are far apart.

[0066] The following describes in detail, using the positive terminal as an example and in conjunction with the accompanying drawings, the battery cover structure, battery, and electrical device provided in the embodiments of this application.

[0067] In the first aspect, embodiments of this application provide a battery cover structure, please refer to... Figures 1 to 3The battery cover structure includes a terminal post 100, a cover assembly 200, and an insulation assembly 300. The cover assembly 200 includes a metal structural member 210.

[0068] The cover assembly 200 is the main sealing component of the battery cover structure, protecting the internal battery cells, wiring, and other components from external environmental factors such as dust, moisture, and foreign objects. The metal structural component 210 is the main structure of the cover assembly 200 and can be directly welded onto the battery casing to achieve a seal inside the battery. The metal structural component 210 is typically made of a metal material with sufficient structural strength.

[0069] The terminal 100 is a conductive carrier connecting the internal electrodes of the battery to the external circuit. It is electrically connected to the current collector inside the battery and can conduct the current inside the battery. The metal structural component 210 usually has through holes for mounting the terminal 100 so that the terminal 100 extends from inside the battery to the outside of the battery.

[0070] The insulation component 300 includes an insulating element 310 and a conductive element 320. The insulating element 310 is disposed between the pole post 100 and the metal structural component 210. A partial area of ​​the insulating element 310 is provided with the conductive element 320. The conductive element 320 connects the pole post 100 and the metal structural component 210, and the conductive element 320 is fusible.

[0071] Please see Figure 3 An insulating component 300 is disposed between the pole post 100 and the cover plate assembly 200. The insulating component 310 provides electrical isolation between the pole post 100 and the metal structural component 210, preventing current from the pole post 100 from being directly conducted to the metal structural component 210. The insulating component 310 can be made of a high-temperature resistant insulating material, such as ceramic or modified plastic.

[0072] The conductive element 320 has both electrical conductivity and fuse protection functions. Firstly, because the conductive element 320 connects the terminal 100 and the metal structural component 210, it can stably conduct the voltage of the terminal 100 to the metal structural component 210, ensuring equal voltage between the terminal 100 and the metal structural component 210 on the battery cover. Secondly, because the battery cover is connected to the battery casing, the voltage of the battery cover can be transferred to the battery casing, further ensuring equal voltage between the terminal 100 and the battery casing. Thirdly, under abnormal operating conditions such as overcurrent or overtemperature, the conductive element 320 can fuse and disconnect the electrical connection between the terminal 100 and the metal structural component 210, thus providing safety protection for the battery.

[0073] It is understood that the number of terminals 100 in the terminal 100 assembly can be one or at least two. When there are two terminals 100 in the battery cover structure, the battery cover structure can provide a conductor 320 only on one of the terminals 100, so that the terminal 100 and the battery cover can be equidistantly associated. In this way, by measuring the voltage between the other terminal 100 and the nearby battery cover, the voltage between the two terminals 100 can be measured, thereby collecting the battery voltage.

[0074] In this embodiment, the conductive element 320 is used to establish a potential difference conduction path between the electrode post 100 and the metal structural component 210. It only needs to be set in a local area of ​​the insulating component 310 to meet the signal transmission requirements for voltage acquisition. The conductive element 320, which is locally set in the insulating component 310, ensures that the voltage conduction path occupies only a small part of the insulating component 310, thus improving both the stability of the acquired signal and the compactness of the battery cover structure.

[0075] Therefore, in this embodiment, the terminal 100 is electrically connected to the metal structure 210 via the conductive element 320, making the terminal 100 and the metal structure 210 equipotential. This helps to shorten the voltage measurement distance between the positive and negative terminals 100 of the battery. When collecting voltage data for a battery where the positive and negative terminals 100 are far apart, it is only necessary to measure the voltage between the terminal 100 and the battery cover at one of the terminals 100 to obtain the battery voltage, thereby effectively reducing the difficulty of voltage acquisition.

[0076] Furthermore, when the battery accidentally comes into contact with an external circuit, this embodiment cuts off the connection between the terminal 100 and the metal structural component 210 through the fusible conductive component 320, thereby preventing the battery casing from rapidly heating up due to excessive current, thus protecting the battery.

[0077] In some alternative embodiments, please refer to Figures 4 to 6 The conductive member 320 includes a first end 321, a second end 322, and a conductive part 323. The first end 321 is provided on the side of the insulating member 310 facing the pole 100 to connect to the pole 100. The second end 322 is provided on the side of the insulating member 310 facing the metal structure member 210 to connect to the metal structure member 210.

[0078] The first end 321 of the conductive member 320 is connected to the electrical connection portion 110 of the terminal post 100, and the second end 322 is connected to the metal structural member 210, so that the electrical connection portion 110 of the terminal post 100 and the metal structural member 210 are electrically connected, thereby making the terminal post 100 and the battery cover plate at the same potential.

[0079] The conductive part 323 is provided in a local area on the periphery of the insulating member 310 to connect the first end 321 and the second end 322.

[0080] Because the conductive part 323 is located in a localized area of ​​the insulating member 310, the voltage conduction path of the conductive member 320 occupies only a small portion of the insulating member 310. This ensures stable voltage conduction while avoiding unnecessary current paths that could affect the normal operation of the battery. Simultaneously, under abnormal operating conditions, heat from the conductive member 320 is more easily diffused to the edges of the insulating member 310 rather than accumulating in the central area, helping to reduce the risk of the insulating member 310 failing due to localized overheating.

[0081] In some alternative embodiments, please refer to Figure 5 The conductive element 320 is a flat metal structure. The flat metal structure can be more closely embedded in the edge groove 314 or reserved channel of the insulating element 310, reducing the space occupied by the overall structure of the insulating element 310, and avoiding assembly interference caused by the structural protrusion 313.

[0082] In some embodiments, the conductive element 320 can be a metal part or a metal coating, which is obtained by machining, spraying or coating processes. For example, it can be made by stamping or cutting a metal material with good ductility such as copper, silver, tin or their alloys as the substrate; or it can be made by coating liquid copper, silver, tin or their alloys onto the surface of the insulating element 310.

[0083] In some alternative embodiments, the conductor 320 has a fused condition, a first conductive condition, and a second conductive condition.

[0084] In the fusing condition, the conductive part 323 is configured to melt after the conducting member 320 transmits the first current for a first time. In the first conducting condition, the conductive part 323 is configured to conduct the terminal 100 and the metal structural member 210 for a second time when the conducting member 320 transmits the second current. In the second conducting condition, the conductive part 323 is configured to continuously conduct the terminal 100 and the metal structural member 210 when the conducting member 320 transmits the third current.

[0085] The first current is greater than the second current, and the second current is greater than the third current.

[0086] Among them, the conductive component 320 can melt itself through its melting mechanism under the melting condition to cut off the electrical connection between the terminal 100 and the metal structural component 210, thereby disconnecting the electrical connection between the battery casing and the external circuit, which helps to ensure the normal use of the battery.

[0087] It is understandable that under the condition of fuse failure, the first current is relatively large, and the conductor 320 generates enough heat in a short time to melt the conductor 320, thereby cutting off the conductive path.

[0088] When the conductive element 320 transmits the second current, the conductive element 320 can maintain a conductive state for a second time relative to the melting condition. The heat generated by the conductive element 320 does not reach the melting threshold, allowing the conductive element 320 to remain conductive under a large current for a short period of time. The second time is longer than the first time.

[0089] When the conductor 320 transmits the third current, it can remain continuously conductive for an extended period. Because the third current is relatively small, the conductor 320 generates less heat, resulting in a stable temperature and ensuring that the heat generated by the battery casing does not affect the normal operation of the battery.

[0090] Therefore, the conductive element 320 in this embodiment, through its fusible mechanism, enables the conductive element 320 to simultaneously possess the dual functions of conductivity and safety protection. On the one hand, it achieves equipotential conduction between the terminal post 100 and the metal structural component 210 to optimize voltage acquisition. On the other hand, when a large current is generated when the battery casing is connected to the external circuit, the circuit between the terminal post 100 and the external circuit is quickly cut off through the fusible mechanism, thereby ensuring the normal operation of the battery.

[0091] Furthermore, the conductive part 323 includes a fusible part 324, which is configured to be fusible after the conductive part 320 transmits the first current for a first time.

[0092] It is understandable that the fusible portion 324 has a relatively high resistance and a relatively small heat capacity compared to other parts of the conductive portion 323, making it easier to melt. In this way, when an excessive current passes through, heat will preferentially accumulate in the fusible portion 324, preventing other areas of the conductive portion 323 from melting unexpectedly.

[0093] The fusible portion 324 can be formed by optimizing the geometry or modifying the material, such as by locally reducing the cross-sectional area of ​​the conductive portion 323 or using a material with a lower melting point, so that it becomes the easily fusible part of the conductive portion 323.

[0094] In some embodiments, please refer to Figure 7 The fusible portion 324 is a curved, narrowed section in the conductive portion 323. The width of the narrowed section is smaller than the width of the first end 321 and the second end 322. The narrowed section forms the fusible portion 324.

[0095] Because the width of the narrowed section is smaller than the widths of the first end 321 and the second end 322, the conductive cross-sectional area of ​​the narrowed section is reduced. Under the same current, the resistance of the narrowed section will be higher than that of other areas of the conductive part 323, causing heat to accumulate more quickly here. This provides a prerequisite for directional melting of the narrowed section and helps to achieve pre-melting of the narrowed section.

[0096] The curved necking section, compared to the straight necking section, lengthens the conductive path of the necking section, thereby facilitating the placement of the necking section within the limited peripheral space of the insulating member 310, so that the necking section forms a fusible segment.

[0097] In some embodiments, please refer to Figure 8 The conductive part 323 includes a fusible part 324 and a metal plating layer 325. The metal plating layer 325 covers the side of the fusible part 324 away from the insulating member 310, and the metal plating layer 325 is configured to shorten the melting time of the connection body.

[0098] The metal plating 325 shortens the melting time of the fusible part 324, which helps to ensure that the conductor 320 melts quickly under unexpected operating conditions, thereby cutting off the connection between the pole 100 and the metal structural member 210.

[0099] Furthermore, the melting point of the metal plating layer 325 is lower than the melting point of the fusible portion 324, and the width of the metal plating layer 325 is smaller than the width of the fusible portion 324.

[0100] The metal plating layer 325 and the fusible part 324 together form the conductive path of the conductor 320. The material of the metal plating layer 325 can be a metal with a melting point lower than that of the substrate of the fusible part 324, such as tin or lead-tin alloy. The metal plating layer 325 is tightly bonded to the fusible part 324 through electroplating or chemical plating processes.

[0101] When current is applied to the conductive part 323, the fusible part 324 and the metal plating layer 325 heat up simultaneously due to resistance heating. Because the metal plating layer 325 has a lower melting point, it will melt or even peel off before the fusible part 324 reaches its own melting point. After the metal plating layer 325 detaches, the current path originally shared by the plating layer and the fusible part 324 narrows, concentrating the current density on the substrate of the fusible part 324. This significantly increases the heating rate of the fusible part 324, allowing it to quickly reach its own melting point, thereby shortening the melting time of the fusible part 324.

[0102] Therefore, by providing a metal plating layer 325 at the fusible portion 324, this embodiment enables the fusible portion 324 to accelerate the protection response under abnormal operating conditions without changing the fusing threshold.

[0103] When current is applied to the conductive part 323, the fusible part 324 and the metal plating layer 325 heat up simultaneously due to resistance heating. Because the metal plating layer 325 has a lower melting point, it will melt or even peel off before the fusible part 324 reaches its own melting point. After the metal plating layer 325 detaches, the current path originally shared by the plating layer and the fusible part 324 narrows, concentrating the current density on the substrate of the fusible part 324. This significantly increases the heating rate of the fusible part 324, allowing it to quickly reach its own melting point, thereby shortening the melting time of the fusible part 324.

[0104] Therefore, by providing a metal plating layer 325 at the fusible portion 324, this embodiment enables the fusible portion 324 to accelerate the protection response under abnormal operating conditions without changing the fusing threshold.

[0105] In some optional embodiments, under fusing conditions, the fusible portion 324 is related to its length, width, and thickness. Specifically, the resistance of the fusible portion 324 is directly proportional to its length l and inversely proportional to its width b and thickness d. By adjusting these three dimensional parameters, the resistance of the fusible portion 324 can be controlled. The length l, width b, and thickness d of the fusible portion 324 satisfy the following conditions:

[0106]

[0107] In the formula, R is the resistance of the fusible part 324, ρ is the resistivity of the fusible part 324, l is the length of the fusible part 324, I1 is the first current, t1 is the first time, m is the mass of the fusible part 324, c is the specific heat capacity of the fusible part 324, and t0 is the melting point of the fusible part 324.

[0108] As can be seen from the above formula, increasing the length or decreasing the width and thickness of the fusible part 324 can increase the resistance, allowing heat to be generated faster under abnormal current, making the fusible part 324 easier to melt.

[0109] For example, I1 and t1 under the fusing condition can be limited to the following range: I1>5A, t1<3s. Then, according to the limiting conditions of the fusible part 324 under the fusing condition, the length l, width b and thickness d of the fusible part 324 are selected so that when the fusible part 324 is in the fusing condition, the fusible part 324 can be fused after the conductor transmits the first current I1 for a first time t1, thus meeting the usage requirements of the conductor under the fusing condition.

[0110] Therefore, in this embodiment, the size of the fusible part 324 is limited by the above conditions to ensure that it can melt at a preset first time under the first current, blocking the dangerous circuit. Under normal second and third currents, it can conduct stably, ensuring equipotential conduction between the electrode and the metal structure, and meeting the voltage acquisition requirements.

[0111] In some alternative embodiments, the length l, width b, and thickness d of the fusible portion 324 also satisfy the following conditions:

[0112]

[0113] In the formula, I2 is the second current, t2 is the second time, and q2 is the heat transfer power of the fusible part 324 under the first conduction condition.

[0114] In this embodiment, by further limiting the size of the fusible part 324, it is ensured that when the surface current of the battery casing is the second current, the fusible part 324 remains in a conductive state in the second time and will not trigger melting, thereby avoiding the normal operation of the battery due to accidental melting.

[0115] For example, I2 and t2 under the first conduction condition can be limited to the following range: 0.1A<I2≤5A,t2> 1h, and then according to the constraints of the fusible part 324 under the first conduction condition, the length l, width b and thickness d of the fusible part 324 are selected so that when the fusible part 324 is in the first conduction condition, the fusible part 324 can melt after the conductor transmits the second current I2 for a second time t2, so as to meet the usage requirements of the conductor under the first conduction condition.

[0116] In some alternative embodiments, the total resistance R0 of the conductive portion at the fusible portion 324 also satisfies the condition:

[0117] I3 2 R0≤q3

[0118] In the formula, I3 is the third current, and q3 is the total heat transfer power of the conductive part under the second conduction condition.

[0119] In this embodiment, by further limiting the total resistance of the fusible part 324, the temperature of the fusible part 324 is kept stable under the second conduction condition, ensuring the equipotential accuracy of the electrode and the metal structure, and ensuring the long-term reliability of the voltage acquisition signal.

[0120] It should be noted that when the fusible part 324 is provided with a metal plating layer 325, the total resistance includes the total resistance formed by the fusible part 324 and the metal plating layer 325 connected in parallel. In this case, q3 is the total heat transfer power of the fusible part 324 and the metal plating layer 325 under the second conduction condition. When the fusible part 324 is a necked section, the total resistance only includes the resistance of the necked section. In this case, q3 is the heat transfer power of the necked section under the second conduction condition.

[0121] For example, I3 under the second conduction condition can be limited to the following range: I3≤0.1A. Then, based on the total resistance requirement of the fusible part 324 under the second conduction condition, the length l, width b and thickness d of the fusible part 324 are selected so that the fusible part 324 will not melt when it is in the second conduction condition.

[0122] In some alternative embodiments, please refer to Figure 9 The conductive member 320 has a first end 321, a second end 322, a conductive part 323 and a safety part. The first end 321 is provided on the side of the insulating member 310 facing the pole 100 to connect to the pole 100; the second end 322 is provided on the side of the insulating member 310 facing the metal structure member 210 to connect to the metal structure member 210.

[0123] The conductive part 323 is provided in a partial area of ​​the periphery of the insulating member 310. The first end of the conductive part 323 is connected to the first end 321, and the second end of the conductive part 323 is connected to the second end 322. The safety part is preset on the periphery of the insulating member 310 to connect the first end and the second end of the conductive part 323.

[0124] In this embodiment, a safety device is introduced compared to the previous embodiment. The safety device is disposed between the first end and the second end of the conductive part 323. The first end and the second end of the conductive part 323 are in an open state. The safety device connects the first end and the second end of the conductive part 323, thereby enabling the conductive member 320 to form a smooth voltage conduction path.

[0125] When the fuse is in normal working condition, the two ends of the conductive part 323 are reliably connected, forming the main conduction path; when the circuit is overloaded or other abnormal, the fuse blows and disconnects, cutting off the connection between the first and second ends of the conductive part 323, thereby realizing the overcurrent protection function.

[0126] Therefore, in this embodiment, the fuse of the conductive element 320 is implemented based on the fuse unit. When designing the fuse mechanism of the conductive element 320, it is only necessary to consider selecting the fuse unit according to different conductivity and fuse requirements. This embodiment does not impose too many restrictions on this. The fuse unit can be a finished part manufactured by an external manufacturer.

[0127] In some alternative embodiments, the conductor 320 has a fused condition, a first conductive condition, and a second conductive condition.

[0128] In the fuse-breaking condition, the fuse is configured to melt after the conductor 320 transmits the first current for a first time. After the conductor 320 transmits the first current and continues for a first time, the fuse will melt due to the large amount of heat generated by the excessive current. The melting of the fuse can promptly cut off the electrical connection between the terminal 100 and the metal structural component 210, avoiding the great safety hazard that continuous flow would pose to the battery.

[0129] During the first conduction condition, the fuse is configured to conduct the terminal 100 and the metal structural member 210 for a second time when the conducting member 320 transmits the second current. The second current is a short-term, relatively large current in the battery casing under specific conditions. Within the second time range, the fuse remains conductive to ensure that the battery can complete the relevant operations normally.

[0130] In the second conduction condition, the fuse is configured to continuously conduct the terminal 100 and the metal structural member 210 when the conducting element 320 transmits the third current. The third current is the continuous current that does not affect the normal operation of the battery, and the fuse ensures that the battery can stably transmit power and collect voltage under normal operating conditions.

[0131] It is understandable that the first current is greater than the second current, and the second current is greater than the third current.

[0132] In some alternative embodiments, please refer to Figures 10 to 11 The insulating member 310 has a limiting portion on its periphery, and a portion of the conductive member 320 is disposed in the limiting portion. The limiting portion is used to limit the width of the conductive member 320.

[0133] The limiting part can limit the conduction element 320 so that the conduction element 320 can be installed stably. The limiting part can extend along the thickness direction of the insulating element 310, with one end of the limiting part extending to the upper end of the insulating element 310 and the other end of the limiting part extending to the lower end of the insulating element 310.

[0134] For example, the limiting portion serves as a structural protrusion 313 or groove 314 on the periphery of the insulating member 310, and its shape and size must match the width design of the conductive member 320. When the corresponding part of the conductive member 320 is embedded in the limiting portion, the protrusion 313 of the limiting portion will form a physical block on the conductive member 320, preventing it from becoming abnormally wide or having a local protrusion 313 due to vibration, deformation, or other reasons during assembly or use.

[0135] In some alternative embodiments, please continue to refer to Figures 1 to 3 The metal structural component 210 is a battery cover plate with mounting holes 211. The insulating component 310 has an assembly part 312 on the side facing the battery cover plate, and the assembly part 312 is located in the mounting hole 211. The insulating component 310 also has a mounting groove 311 on the side facing the terminal post 100, and the terminal post 100 is located in the mounting groove 311 and connected to the assembly part 312 and the battery cover plate.

[0136] The metal structural component 210 serves as the battery cover, simultaneously functioning as both a battery sealing cap and a conductive path, further optimizing the integration of the battery cover structure. The mounting hole 211 provides a precise positioning basis for the assembly of the insulating component 310 and the battery cover. When the assembly part 312 is inserted into the mounting hole 211, a tight fixation can be achieved through interference fit or snap-fit ​​connection, ensuring both positional stability between the insulating component 310 and the battery cover, and preventing direct electrical connection between the terminal post 100 and the battery cover through the material properties of the insulating component 310, thus avoiding the risk of short circuits. In some embodiments, the assembly part 312 is riveted to the mounting hole 211.

[0137] One end of the conductive element 320 extends into the mounting groove 311 and connects to the terminal post 100. The other end of the conductive element 320 extends to the side of the insulating element 310 facing the battery cover to connect to the battery cover. One end of the conductive element 320 extends into the mounting groove 311 to form a surface contact or line contact with the terminal post 100, ensuring that the electrical signal obtained from the terminal post 100 can be transmitted to the conductive element 320. The other end of the conductive element 320 extends to the side of the insulating element 310 facing the battery cover and is connected to the battery cover by bolt fixing or welding, so that the current signal can be smoothly conducted to the battery cover through the conductive element 320, ultimately forming a complete conductive path.

[0138] Therefore, this embodiment improves the assembly accuracy of the insulating component 310 by cooperating with the mounting hole 211 and the assembly part 312, achieves stable fixation of the pole post 100 by the mounting groove 311, and ensures the continuity of electrical signal transmission by the extension connection of the conductive component 320. This allows the battery cover to perform its sealing function while efficiently undertaking the role of voltage acquisition and safety protection, further reducing the space occupied by the overall structure and adapting to the development needs of battery miniaturization and high integration.

[0139] In some alternative embodiments, please refer to Figure 2 The insulating component 310 is a plastic separator sandwiched between the terminal post 100 and the battery cover.

[0140] Plastic separators can be made of engineering plastics that are resistant to high temperatures and chemical corrosion, such as polyamide, polyoxymethylene, or modified polypropylene. They can effectively block unintended electrical connections between the terminal 100 and the battery cover. Compared with inorganic insulating materials such as ceramics, plastic separators have better toughness and impact resistance. When the battery is subjected to vibration or impact, they can buffer the mechanical stress between the terminal 100 and the battery cover, reducing the risk of structural damage caused by hard collisions.

[0141] In some alternative embodiments, please refer to Figures 12 to 14 The cover assembly 200 also includes a battery cover, and the metal structure 210 is a metal ring 220 installed inside the battery cover.

[0142] The pole 100 has an electrical connection portion 110 and a mounting portion 120 in the length direction. The mounting portion 120 is sequentially inserted into the insulating member 310 and the metal ring 220. The conductive member 320 connects the electrical connection portion 110 and the metal ring 220.

[0143] The metal ring 220 can be made of a metal material with excellent conductivity and high mechanical strength, such as copper alloy or stainless steel. The outer circumference of the metal ring 220 can be fixed to the inner wall of the battery cover by interference fit, welding, or injection molding inserts to ensure that the metal ring 220 does not loosen or shift within the battery cover. On the one hand, the metal ring 220 can maintain the sealing function of the battery cover; on the other hand, it can transfer voltage to the metal cover through its own conductivity. This allows the voltage of the terminal 100 to be transferred to the metal cover through the conductive element 320 and the metal structural element 210, making the terminal 100 and the battery cover at the same potential, thereby shortening the testing distance of the battery voltage.

[0144] In some alternative embodiments, please refer to Figure 14 One end of the conductive member 320 extends to the side of the insulating member 310 facing the electrical connection portion 110 and matches the shape of the insulating member 310 to connect the electrical connection portion 110; the other end of the conductive member 320 extends to the side of the insulating member 310 facing the metal ring 220 and matches the shape of the metal ring 220 to connect the metal ring 220.

[0145] The conductive element 320 has an end that matches the shape of the insulating element 310, and the conductive element 320 has an end that matches the shape of the metal ring 220, so that the conductive element 320 can fit tightly against the surface of the insulating element 310 and the outer periphery of the metal ring 220. This allows for surface contact between the conductive element 320 and the insulating element 310, and between the conductive element 320 and the metal ring 220. Compared with point contact or line contact, this effectively reduces contact resistance and reduces the heat generated by the conductive element 320.

[0146] In some optional embodiments, the conductor 320 has a conductive portion 323, and the melting point of the conductor 320 at both ends is greater than the melting point of the conductive portion 323. When a localized poor contact occurs at the connection point, resulting in an abnormally increased resistance and excessive heat generation, the conductive portion 323 with the higher melting point will melt first, promptly cutting off the conductive path and preventing the continuous accumulation of heat from damaging the electrode post 100 or the metal ring 220.

[0147] As the main conductive channel of the conductive element 320, the conductive part 323 needs to maintain stable conduction under normal operating conditions and a certain degree of abnormal operating conditions; therefore, a low melting point is set. When the conductive part 323 does not melt, it can reliably transmit current, ensuring the normal operation of functions such as voltage acquisition. Conversely, the conductive part 323 will only melt when a large current occurs in the circuit for a prolonged period, causing its temperature to rise to its own melting point.

[0148] For example, the conductive part 323 can be a nickel-plated layer, and the two ends can be molybdenum-manganese layers, so that the conductive part 323 can be quickly melted under the first current.

[0149] In some alternative embodiments, the battery cover structure includes a positive electrode cover.

[0150] The electrode post 100 assembly integrated in the positive electrode cover corresponds to the positive electrode of the battery. That is, the positive electrode post 100 and the battery cover can be made at the same potential through the conductive part 320 at the positive electrode cover. Thus, when collecting the battery voltage, the battery voltage can be obtained by measuring the voltage between the negative electrode post 100 and the battery cover or battery casing at the negative electrode post 100.

[0151] Secondly, embodiments of this application also provide a battery, including a battery casing and the aforementioned battery cover structure, the battery cover structure being disposed on the battery casing. Therefore, this battery also possesses the beneficial effects of the terminal post 100 assembly of any of the above embodiments, namely, shortening the battery voltage measurement distance and facilitating voltage acquisition.

[0152] In this application, the embodiment does not specifically limit the structure or type of the battery. The battery can be a single cell or a battery pack or battery stack composed of multiple cells.

[0153] Thirdly, this application also provides an electrical device, including a device body and the aforementioned battery. The device body has a mounting compartment, and the battery is disposed within the mounting compartment. It is understood that the battery and electrical device provided in this application both include the terminal assembly of any of the above embodiments. Therefore, the battery and electrical device also possess the beneficial effects of the terminal assembly of any of the above embodiments. That is, because the battery and electrical device have the aforementioned terminal assembly, the battery has the function of easily collecting battery voltage, so that when abnormal battery voltage information is detected, it can be detected in a timely manner, thereby improving the safety of the battery and the electrical device.

[0154] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0155] In the description of this utility model, it should be understood that the terms "comprising" and "having" as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0156] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cover structure, characterized in that, include: pole (100); Cover assembly (200), including metal structural member (210); An insulating component (300) includes an insulating element (310) and a conductive element (320). The insulating element (310) is disposed between the pole post (100) and the metal structural member (210). The conductive element (320) is provided in a partial area of ​​the insulating element (310). The conductive element (320) connects the pole post (100) and the metal structural member (210), and the conductive element (320) is fusible.

2. The battery cover structure according to claim 1, characterized in that, The conductive member (320) includes a first end (321), a second end (322), and a conductive portion (323). The first end (321) is disposed on the side of the insulating member (310) facing the pole (100) to connect to the pole (100). The second end (322) is disposed on the side of the insulating member (310) facing the metal structural member (210) to connect to the metal structural member (210). The conductive portion (323) is provided in a local area on the periphery of the insulating member (310) to connect the first end (321) and the second end (322).

3. The battery cover structure according to claim 2, characterized in that, The conductive element (320) is a flat metal structure.

4. The battery cover structure according to claim 2, characterized in that, The conductive part (323) includes a fusible part (324), which is a curved, narrowed section in the conductive part (323), and the width of the narrowed section is smaller than the width of the first end (321) and the second end (322). And / or, the conductive portion (323) includes a fusible portion (324) and a metal plating layer (325), the metal plating layer (325) covering the side of the fusible portion (324) away from the insulating member (310), and the metal plating layer (325) is configured to shorten the melting time of the fusible portion (324).

5. The battery cover structure according to claim 4, characterized in that, The melting point of the metal plating layer (325) is lower than the melting point of the fusible portion (324), and the width of the metal plating layer (325) is smaller than the width of the fusible portion (324).

6. The battery cover structure according to claim 2, characterized in that, The first end of the conductive part (323) is connected to the first end (321), and the second end of the conductive part (323) is connected to the second end (322); The conductive element (320) also includes a fusible fuse, which is pre-installed on the periphery of the insulating element (310) to connect the first end and the second end of the conductive element (323).

7. The battery cover structure according to claim 1, characterized in that, The insulating member (310) has a limiting portion on its periphery, and a portion of the conductive member (320) is disposed on the limiting portion. The limiting portion is a protrusion (313) or groove (314) on the periphery of the insulating member (310).

8. The battery cover structure according to any one of claims 1-7, characterized in that, The metal structural component (210) is a battery cover plate, which has mounting holes (211). The insulating component (310) has an assembly part (312) on the side facing the battery cover plate, and the assembly part (312) is located in the mounting hole (211). The insulating component (310) also has a mounting groove (311) on the side facing the terminal post (100), and the terminal post (100) is located in the mounting groove (311) and connected to the assembly part (312) and the battery cover plate. One end of the conductor (320) extends into the mounting groove (311) and is connected to the terminal post (100), and the other end of the conductor (320) extends to the side of the insulator (310) facing the battery cover to connect to the battery cover.

9. The battery cover structure according to claim 8, characterized in that, The insulating component (310) is a plastic separator sandwiched between the terminal post (100) and the battery cover.

10. The battery cover structure according to any one of claims 1-7, characterized in that, The cover assembly (200) also includes a battery cover, and the metal structural member (210) is a metal ring (220) installed inside the battery cover; The pole (100) has an electrical connection part (110) and a mounting part (120) in the length direction. The mounting part (120) is sequentially inserted into the insulating member (310) and the metal ring (220). The conductive member (320) connects the electrical connection part (110) and the metal ring (220).

11. The battery cover structure according to claim 10, characterized in that, One end of the conductive member (320) extends to the side of the insulating member (310) facing the electrical connection portion (110) and matches the shape of the insulating member (310) to connect the electrical connection portion (110); The other end of the conductor (320) extends to the side of the insulator (310) facing the metal ring (220) and matches the shape of the metal ring (220) to connect the metal ring (220).

12. The battery cover structure according to claim 11, characterized in that, The conductive element (320) has a conductive portion (323), and the melting point of the conductive element (320) at both ends is greater than the melting point of the conductive portion (323).

13. The battery cover structure according to any one of claims 1-7, characterized in that, The battery cover structure includes a positive electrode cover; And / or, the conductive element (320) is a metal coating on the insulating element (310).

14. A battery, characterized in that, include: Battery casing; The battery cover structure as described in any one of claims 1-13, wherein the battery cover structure is disposed on the battery housing.

15. An electrical appliance, characterized in that, include: The device body, which includes an installation compartment, The battery of claim 14, wherein the battery is disposed within the mounting compartment.

Images