Thermal protection battery connecting bar and battery with same

Abstract

The invention provides a thermal protection battery connection bar and a battery with the same. The thermal protection battery connecting bar comprises a first core body, a first connecting structure, a second core body and a second connecting structure, the first end of the first connecting structure is connected with the first core body, the second end of the first connecting structure is provided with a thermal moving contact, and the thermal moving contact has a triggering state of generating deformation when being heated; the first end of the second connecting structure is connected with the second core body, and the second end extends towards the first connecting structure; wherein the first connecting structure is provided with a connecting position which is connected with the second connecting structure to enable the first core body and the second core body to be conducted, and the first connecting structure is provided with a disconnecting position which is disconnected from the second connecting structure. The first connecting structure and the second connecting structure are disconnected through deformation of the thermal moving contact when the thermal moving contact is heated, and the technical problem that in the prior art, when the battery is in thermal runaway, a diffusion channel cannot be cut off in time, and fire breaks out is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery systems, and in particular to a thermal protection battery connection bar and a battery having the same. Background Art

[0002] With the development of battery technology, batteries have been widely used in many fields, such as electric vehicles, energy storage systems, drones, portable electronic products, etc. In recent years, safety accidents caused by thermal runaway of lithium-ion batteries have occurred frequently in energy storage applications in various fields, and some have even caused significant loss of life and property.

[0003] Thermal runaway is an important aspect of battery safety. Battery thermal runaway means that when the battery temperature rises to a certain threshold, the chemical reaction inside the battery gets out of control, causing the chemical substances in the battery to decompose violently, releasing a large amount of heat. The violent reaction of the chemical substances in the battery causes a short circuit, and the internal pressure of the battery increases dramatically. The gas produced by the decomposition of the internal substances of the battery will further increase the battery pressure. The battery pressure increases dramatically and the battery goes into thermal runaway. Battery thermal runaway can lead to serious consequences such as battery breakdown, battery pack explosion and fire.

[0004] In the prior art, when a cell in a battery pack or battery system experiences thermal runaway, it often transfers high temperature to adjacent cells, causing thermal runaway, which continues to spread and eventually causes the entire battery pack or system to catch fire and explode. At present, in order to slow down the spread of possible thermal runaway, preventive measures are taken to fill flame-retardant and thermally insulating media between adjacent cells during the assembly of battery modules or battery packs, and even fire-fighting facilities are deployed in some large battery systems. However, the cells in the battery pack are connected by excellent conductors, which also provides a good heat conduction channel between the cells, which means that once a cell experiences thermal runaway, the diffusion channel of the thermal runaway is unobstructed, and simply placing thermal insulation materials between the cells cannot effectively block the spread of thermal runaway.

[0005] To address the above problems, no effective solution has been proposed yet. Summary of the invention

[0006] The main purpose of the present invention is to provide a thermal protection battery connection bar and a battery having the same, so as to solve the technical problem in the prior art that when the battery is thermally out of control, the diffusion channel cannot be cut off in time, resulting in fire.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a thermal protection battery connection row, comprising: a first core; a first connection structure, a first end of the first connection structure is connected to the first core, and a second end of the first connection structure is provided with a thermal contact, and the thermal contact has a trigger state in which deformation occurs when heated; a second core; a second connection structure, a first end of the second connection structure is connected to the second core, and a second end of the second connection structure is extended toward the first connection structure; wherein the first connection structure has a connection position connected to the second connection structure so that the first core and the second core are conductive, and the first connection structure has a disconnection position disconnected from the second connection structure, and when the thermal contact is in the trigger state, the first connection structure is in the disconnection position.

[0008] Furthermore, the second connecting structure is an elastic structure. When the first connecting structure is in the disconnected position, the second end of the second connecting structure moves toward the second core along the length direction of the second connecting structure, so that the distance between the thermal contact and the second end of the second connecting structure is gradually enlarged.

[0009] Furthermore, the second end of the second connection structure forms a spring contact, and when the first connection structure is located at the connection position, the spring contact is connected to the thermal contact.

[0010] Furthermore, the spring contact and the thermal contact are both arc surface structures, and the spring contact and the thermal contact are arranged to be snap-fitted, and when the first connection structure is in the connection position, one of the spring contact and the thermal contact is arranged inside the other.

[0011] Furthermore, the central axis of the spring contact is perpendicular to the extension direction of the first connection structure, and the central axis of the thermal contact is perpendicular to the extension direction of the second connection structure.

[0012] Furthermore, when the thermal contact is in a triggered state, the deformation direction of the thermal contact is a tangent direction of the end of the thermal contact.

[0013] Furthermore, the first connecting structure is a bimetallic strip structure, which includes a first metal layer and a second metal layer, and the second metal layer is located at the bottom of the first metal layer, wherein the first metal layer and the second metal layer have different thermal expansion coefficients, so that relative movement occurs between the first metal layer and the second metal layer when the first connecting structure is heated.

[0014] Furthermore, the first end of the second connection structure is a spring body, and one end of the spring body away from the second core body is connected to the spring contact.

[0015] Furthermore, the thermal protection battery connection row also includes: a shell cover; a shell, the shell and the shell cover are arranged opposite to each other, and a accommodating cavity is formed between the shell and the shell cover, the first connecting structure and the second connecting structure are both located in the accommodating cavity, part of the first core is located in the accommodating cavity, and part of the second core is located in the accommodating cavity.

[0016] Furthermore, at least one of the first core body and the second core body is provided with a positioning hole.

[0017] According to another aspect of the present invention, a battery is provided, comprising a thermal protection battery connection bar, wherein the thermal protection battery connection bar is the thermal protection battery connection bar described above.

[0018] By applying the technical solution of the present invention, the thermal protection battery connection row includes a first core and a second core, which are respectively connected to the first connection structure and the second connection structure. A thermal contact is provided at the end of the first connection structure, and when the battery is thermally runaway, the thermal contact is deformed by heat, thereby disconnecting the first connection structure from the second connection structure. This design can cut off the circuit in time when the battery is overheated, effectively protecting the safety of the battery and the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic structural diagram of a first embodiment of a thermal protection battery connection row according to the present invention is shown;

[0021] Figure 2 A schematic structural diagram of a second embodiment of a thermal protection battery connection row according to the present invention is shown;

[0022] Figure 3 A schematic structural diagram of a third embodiment of a thermal protection battery connection bar according to the present invention is shown;

[0023] Figure 4 A schematic structural diagram of a fourth embodiment of a thermal protection battery connection bar according to the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. a first core;

[0026] 11. first connection structure; 111. thermal contact;

[0027] 20. second core;

[0028] 21. Second connection structure; 211. Spring contact; 212. Spring body;

[0029] 30. Shell cover;

[0030] 40. Shell;

[0031] 50. Positioning hole. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0036] The battery connector is a conductor that connects battery cells in series. It is required to have a sufficiently low internal resistance to reduce connection losses. Therefore, it is made of good conductors such as aluminum and copper. Their melting temperatures are much higher than the high temperatures generated by thermal runaway of the battery, and they are the preferred channels for diffusion when thermal runaway occurs. The existing technology uses fusible alloys to make connectors. Although they can be melted during thermal runaway, the connection losses caused by their high resistivity are unacceptable to the system. This article describes a non-fuse thermal protection connector that can both achieve the thermal protection function of overheating the connector and reduce internal resistance.

[0037] Combination Figures 1 to 4 As shown, according to a specific embodiment of the present application, a thermal protection battery connection row is provided.

[0038] The thermal protection battery connection row includes: a first core 10, a first connection structure 11, a second core 20 and a second connection structure 21. The first end of the first connection structure 11 is connected to the first core 10, and the second end of the first connection structure 11 is provided with a thermal contact 111, and the thermal contact 111 has a trigger state in which deformation occurs when heated; the first end of the second connection structure 21 is connected to the second core 20, and the second end of the second connection structure 21 is extended toward the first connection structure 11; wherein the first connection structure 11 has a connection position connected to the second connection structure 21 so that the first core 10 and the second core 20 are conductive, and the first connection structure 11 has a disconnection position disconnected from the second connection structure 21, and when the thermal contact 111 is in the trigger state, the first connection structure 11 is in the disconnection position.

[0039] By applying the technical solution of the present invention, the thermal protection battery connection row includes a first core 10 and a second core 20, which are respectively connected to a first connection structure 11 and a second connection structure 21. A thermal contact is provided at the connection between the first connection structure 11 and the second connection structure 21. When the battery is thermally runaway, the thermal contact is deformed by heat, thereby disconnecting the first connection structure 11 from the second connection structure 21. This design can cut off the circuit in time when the battery is overheated, effectively protecting the safety of the battery and the equipment.

[0040] like Figure 1As shown, one end of the first core 10 is connected to the first connection structure 11, and the four first connection structures are arranged at intervals along the width direction of the first core 10. The first connection structure 11 and the first core 10 are riveted together, which can ensure the firmness of the connection between the first connection structure 11 and the first core 10 even when the battery system is subjected to vibration or impact. The four first connection structures are provided with thermal contacts at one end away from the first core 10, and the four thermal contacts are also arranged at intervals along the width direction of the first core 10. The other end of the first core 10 is used as a pin of the battery connection row, which is used to connect to the pole of the battery, and its pins are respectively welded to the poles of different single cells to realize the connection string of each single cell.

[0041] Furthermore, the second connection structure 21 is an elastic structure. When the first connection structure 11 is in the disconnected position, the second end of the second connection structure 21 moves toward the second core 20 along the length direction of the second connection structure 21, so that the distance between the thermal contact 111 and the second end of the second connection structure 21 is gradually expanded. When the first connection structure 11 is in the disconnected position, the disconnected position refers to when the battery cell has thermal runaway, the thermal contact 111 of the first connection structure 11 bends due to heat and is disconnected from the second connection structure 21, and the second connection structure 21 is subjected to an elastic force, which causes the second end of the second connection structure 21 to retract rapidly, so that the distance between the thermal contact 111 and the second end of the second connection structure 21 is gradually expanded. This design ensures that the connection row will not be closed again even in an extremely high temperature environment, thereby avoiding the spread of thermal runaway and protecting the safety of the battery system.

[0042] Specifically, the second end of the second connection structure 21 forms a spring contact 211, and when the first connection structure 11 is in the connection position, the spring contact 211 is connected to the thermal contact 111. Due to the elastic pressure of the spring contact, the connection between the spring contact 211 and the thermal contact 111 can form a connection with low contact resistance, reduce the power loss caused by poor contact during the conduction process, and improve the energy transmission efficiency of the entire battery system.

[0043] like Figure 1 As shown, one end of the second core 20 is connected to the second connection structure 21, and the other end of the second core 20 serves as a pin of the battery connection row, which is used to connect to the battery pole. The pins are respectively welded to the poles of different single cells to achieve the connection string of each single cell.

[0044] Specifically, the spring contact 211 and the thermal contact 111 are both arc-surface structures, and the spring contact 211 and the thermal contact 111 are arranged to be snap-fitted. When the first connection structure 11 is in the connection position, one of the spring contact 211 and the thermal contact 111 is arranged inside the other. The spring contact 211 and the thermal contact 111 are both designed to be arc-surface structures slightly larger than a semicircle. The arc-surface structure of the spring contact 211 matches the arc-surface structure of the thermal contact 111. This shape design is conducive to the snap-fitting between the two. Figure 2 As shown, the spring contact 211 and the thermal contact 111 are arranged opposite to each other, and the spring contact 211 is located at the bottom of the thermal contact 111. At room temperature and in a natural state, when the first connecting structure 11 is in the connection position, the thermal contact 111 and the spring contact 211 are separated, and the second connecting structure 21 can be stretched to make the spring contact 211 and the thermal contact 111 snap together, and they will be naturally locked under the action of elastic force to form a closed contact. This closed state ensures that the connection row is conductive, so that the current can flow smoothly from one battery cell to another. The design of the arc surface structure can make the spring contact 211 and the thermal contact 111 have a larger contact surface, ensuring that under normal working conditions, even if there is a slight displacement or vibration, the contact can maintain a good contact state and reduce the contact resistance.

[0045] Furthermore, the central axis of the spring contact 211 is perpendicular to the extension direction of the first connection structure 11, and the central axis of the thermal contact 111 is perpendicular to the extension direction of the second connection structure 21. The design that the central axis of the spring contact 211 is perpendicular to the extension direction of the first connection structure 11, and the central axis of the thermal contact 111 is perpendicular to the extension direction of the second connection structure 21 helps the spring contact 211 and the thermal contact 111 to be in direct contact when touching, avoiding poor contact or additional mechanical stress that may be caused by oblique contact, thereby ensuring low resistance and long life of the contact.

[0046] In an exemplary embodiment, when the thermal contact 111 is in a triggered state, the deformation direction of the thermal contact 111 is tangential to the end of the thermal contact 111. Figure 3 As shown, in the case of overheating, when the thermal contact 111 is in a triggered state, the thermal contact 111 is prompted to move along its central axis, while the spring contact 211 retracts along an axis perpendicular to the moving direction of the thermal contact. This vertical arrangement ensures that when the thermal contact 111 deviates from its contact position with the spring contact 211, the spring contact 211 can be quickly and linearly retracted to the initial position, reducing unnecessary friction and resistance between the spring contact 211 and the thermal contact 111, achieving rapid disconnection of the contact, and preventing the spread of thermal runaway.

[0047] Specifically, the first connection structure 11 is a bimetallic structure, and the first connection structure 11 includes a first metal layer and a second metal layer, and the second metal layer is located at the bottom of the first metal layer, wherein the first metal layer and the second metal layer have different thermal expansion coefficients, so that the first connection structure 11 generates relative movement between the first metal layer and the second metal layer when heated. When heated, the relative movement between the first metal layer and the second metal layer causes the bimetallic structure to deform and bend, thereby disconnecting the connection contact between the spring contact 211 and the thermal contact 111, cutting off the diffusion path of thermal runaway, and significantly improving the thermal safety performance of the battery system.

[0048] like Figure 2 , Figure 3 As shown, the bimetallic strip structure is designed to be a flat shape with a relatively large length-width ratio, one end of which is fixed to the first core 10 by a rivet, and its free end is stamped into a circular arc surface structure, i.e., the thermal contact 111. The bending direction and amplitude of the bimetallic strip structure depend on the temperature change and the difference in thermal expansion coefficients of the two metal materials. In this embodiment, the first metal layer is made of a metal with a lower expansion coefficient (such as iron), and the second metal layer is made of a metal with a higher expansion coefficient (such as copper), and the two metals are fused into one by a lamination process. At normal operating temperature, the bimetallic strip structure maintains a straight line state, so that the thermal contact 111 is in close contact with the spring contact 211, forming a closed contact point, thereby ensuring the conductive performance of the connection row. When thermal runaway occurs in the battery cell and the temperature rises sharply, the bimetallic strip structure bends toward the side with a lower expansion coefficient (i.e., the first metal layer on the upper layer). At this time, the deformation direction of the thermal contact 111 is tangential to the end of the thermal contact 111, causing the thermal contact 111 to deviate from the spring contact 211, triggering the disconnection of the contacts, cutting off the electrical connection between the batteries, and preventing the further spread of thermal runaway.

[0049] As an alternative embodiment, a group of bimetallic strips is used instead of multiple bimetallic strips. A group of bimetallic strips can provide a larger current-carrying area than multiple independent bimetallic strips. This means that a single composite connecting row can carry a larger current and a lower current density. The reduced current density can reduce the generation of heat energy, thereby reducing the risk of overheating. A group of bimetallic strips can respond to temperature changes more uniformly, which means that the thermal contact system of the entire connecting row can trigger the disconnection mechanism more consistently when encountering overheating. This is crucial to ensure that all connecting rows can respond simultaneously when the battery system overheats and provide comprehensive thermal protection. A group of bimetallic strips can take up less space than multiple bimetallic strips, which is very beneficial for the compact layout inside the battery pack. It can help achieve lightweight and miniaturization of the battery system without affecting or enhancing its thermal safety performance. It can also reduce the complexity of the manufacturing process, such as reducing the stamping, riveting and other processes of a single bimetallic strip. This not only simplifies the production process, but also may reduce material costs and manufacturing costs and improve production efficiency.

[0050] Specifically, the first end of the second connection structure 21 is a spring body 212, and the end of the spring body 212 away from the second core 20 is connected to the spring contact 211. The spring body 212 has good elasticity. The spring body 212 can maintain a certain compression state in a natural state, and can quickly stretch or shrink when needed. Once the battery overheats, such as thermal runaway, the bimetallic structure will take the thermal contact 111 away from the spring contact 211, and the spring body 212 will respond immediately, causing the spring contact 211 to retract to the initial position of the second connection structure 21, causing the contact to be disconnected, cutting off the electrical connection between the faulty battery and the normal battery, thereby preventing the spread of thermal runaway.

[0051] like Figure 1 As shown, the spring body 212 is located at the end of the second connection structure 21 away from the footnote, and is designed to be corrugated. The spring body 212 is usually made of a material with good elasticity and conductivity, such as copper or copper alloy. These materials can not only provide the conductive function required by the connection row, but also ensure that the spring body 212 still maintains its mechanical properties after multiple expansions and contractions, ensuring the long-term reliability and stability of the connection row. The spring contact 211 is located at the end of the spring body 212. In this embodiment, the spring contact 211 and the spring body 212 are integrally formed. The integrally formed design of the spring contact 211 and the spring body 212 allows the thermal protection battery connection row to form a compact unit inside the battery system. This design helps to reduce the volume of the battery connection row, facilitates layout and installation in the battery pack, and is also conducive to achieving efficient and rapid response of the contact system.

[0052] It should be noted that the first connection structure 11 and the thermal contact 111 at its end and the second connection structure 21 and the spring body 212 and spring contact 211 provided at one end form the contact system of the thermal protection battery connection row. The connection between the spring contact 211 and the thermal contact 111 is achieved through a non-fuse thermal protection mechanism that can remain closed when the battery is working normally and automatically disconnect in the event of overheating to prevent the spread of thermal runaway.

[0053] In another exemplary embodiment, the thermal protection battery connection row further includes: a shell cover 30 and a shell 40. The shell 40 is arranged opposite to the shell cover 30, and a receiving cavity is formed between the shell 40 and the shell cover 30. The first connection structure 11 and the second connection structure 21 are both located in the receiving cavity, part of the first core 10 is located in the receiving cavity, and part of the second core 20 is located in the receiving cavity. The shell cover 30 and the shell 40 are containers for storing the first connection structure 11 and the second connection structure 21.

[0054] like Figure 4As shown, the shell 40 is a rectangular parallelepiped structure, and a groove is respectively provided on two sides of the upper end surface of the shell 40 that are arranged opposite to each other in the width direction, and the width of the groove corresponds to the width of the first core 10 and the second core 20. The three-section composite structure composed of the first core 10, the first connecting structure 11, the second connecting structure 21 and the second core 20 connected in sequence can be placed in the groove on the upper end surface of the shell 40. The length of the shell 40 is less than the length of the composite structure, so part of the first core 10 is located outside the accommodating cavity, and part of the second core 20 is located outside the accommodating cavity, which makes it easier for the pins located outside the first core 10 and the second core 20 to be connected to the poles of the battery.

[0055] Furthermore, a receiving cavity is formed between the shell 40 and the shell cover 30, and a positioning column is provided at each of the four corners of the receiving cavity and the middle position of the two sides arranged along the length direction. The shell cover 30 is provided with 6 connection holes arranged corresponding to the 6 positioning columns. The length and width of the shell cover 30 are arranged one by one with the shell 40, which can ensure the sealing of the direct connection between the shell 40 and the shell cover 30. The 6 positioning columns also play the role of fixing the three-section composite structure composed of the first core 10, the first connecting structure 11, the second connecting structure 21 and the second core 20 connected in sequence, so as to avoid vibration and displacement during use, which may cause the contact system to be disconnected. The first connecting structure 11 and the second connecting structure 21 are completely located in the receiving cavity, and the shell can provide physical protection for the first connecting structure 11 and the second connecting structure 21 to prevent the influence of external mechanical damage, corrosion, moisture intrusion and other environmental factors on the contact system, and ensure that it can operate reliably under various working conditions.

[0056] The housing 40 and the cover 30 are usually made of insulating materials, which can electrically isolate the contact system from other parts of the battery pack and the external environment to avoid electrical short circuits or leakage, and ensure the electrical safety of the battery system. The housing 40 can also enhance the mechanical strength of the entire connection row, especially in complex battery pack layouts, where the housing 40 can provide additional support and stability to prevent the connection row from being damaged by external pressure or vibration.

[0057] Further, at least one of the first core 10 and the second core 20 is provided with a positioning hole 50. The positioning hole 50 is used to accurately position the first core 10 and the second core 20 when assembling the connection row. By matching with the positioning column or other fixing device on the shell 40, the positioning hole 50 ensures the accurate position of the first core 10 and the second core 20 in the housing cavity of the shell 40.

[0058] like Figure 1 As shown, a positioning hole is provided at two sides of the first core 10 disposed along the length direction near the first connection structure 11, and a positioning hole 50 is provided at two sides of the second core 20 disposed along the length direction near the spring body 212. Figure 4 The positioning holes 50 are connected to the positioning posts provided at the four corners of the housing 40 to determine the accuracy of the installation positions of the first core 10 and the second core 20. The positioning holes 50 enable the connection row to be quickly and accurately removed or reinstalled from the housing 40, thereby simplifying the battery system maintenance process and improving maintenance efficiency.

[0059] The above embodiments can also be used in the field of equipment technology. That is, according to another aspect of the present invention, a battery is provided, including a thermal protection battery connection bar, which is the thermal protection battery connection bar described in the above embodiments.

[0060] The thermal protection battery connection row is installed in the battery pack, and the first core 10 is fixed to the shell 40 through the positioning hole 50 to ensure the correct position of the bimetallic strip structure and the shell 40. Then, the second core 20 is also fixed to the other side of the shell 40 through the positioning hole 50. At this time, the spring contact 211 and the thermal contact 111 remain separated. The spring body 212 is stretched by external force (such as manual operation) so that the spring contact 211 contacts the thermal contact 111 and forms a closed contact. The elasticity of the spring body 212 ensures that under normal operating conditions, the contact system can work stably and the contact resistance is low. When the contact is closed, the shell cover 30 is installed on the shell 40 to completely close the shell 40, providing an environment isolated from the outside world for the contact system, while ensuring the stability and safety of the contact system.

[0061] The contacts of the assembled thermal protection connecting bar are in a closed state, and its pins are respectively welded to the poles of different single-cell batteries to realize the connection string of each single cell. Under normal operating conditions (no thermal runaway occurs, and the battery cell is not overheated), the thermal protection connecting bar is equivalent to the normal conduction of the ordinary connecting bar.

[0062] At the normal operating temperature of the battery, the contact system is in a closed state, and the current flows from the pins of the first core 10 through the first connection structure 11, the thermal contact 111, the spring contact 211, the spring body 212, and the second connection structure 21 to the pins of the second core 20, thereby realizing the electrical connection between the battery cells. When the battery overheats (such as thermal runaway), the heat is transferred to the bimetallic structure through the pins, causing the bimetallic structure to bend to the side with a lower expansion coefficient, thereby causing the thermal contact 111 to detach from the spring contact 211. At this time, the spring contact 211 quickly retracts under the elastic action of the spring body 212, and the contact system is disconnected, cutting off the electrical connection between the battery cells, realizing the overheating protection function, and preventing thermal runaway from spreading to the entire battery system.

[0063] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0064] 1. Through the design of spring contacts and thermal contacts, it is possible to respond quickly when an overheating signal is detected. Due to the thermal actuation effect of the bimetallic structure, the thermal contact quickly breaks away from the contact with the spring contact, and the spring body responds immediately, causing the spring contact 211 to retract to the initial position of the second connection structure 21, thereby achieving rapid disconnection of the contacts, thereby disconnecting the first chip and the second chip, and cutting off the electrical connection between the faulty battery and the normal battery, thereby immediately preventing the spread of thermal runaway and improving the overall safety of the battery system.

[0065] 2. The first chip and the second chip adopt a segmented structure and elastic connection design, which improves the mechanical strength and fatigue resistance of the connecting bar, extends the service life of the connecting bar, and reduces the failure rate caused by mechanical wear or stress. Through the compact design, the space occupied by the connecting bar is reduced, which is conducive to the lightweight and compact design of the battery pack.

[0066] 3. The isolation protection design of the shell ensures the stability and reliability of the contact system in complex environments, further enhancing the environmental adaptability of the battery pack.

[0067] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0068] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0069] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermal protection battery connection bar, characterized in that: include: A first core (10); A first connection structure (11), wherein a first end of the first connection structure (11) is connected to the first core (10), and a second end of the first connection structure (11) is provided with a thermal contact (111), wherein the thermal contact (111) has a trigger state that generates deformation when heated; A second core (20); a second connecting structure (21), wherein a first end of the second connecting structure (21) is connected to the second core (20), and a second end of the second connecting structure (21) is extended toward the first connecting structure (11); The first connecting structure (11) has a connecting position connected to the second connecting structure (21) so that the first core (10) and the second core (20) are electrically connected, and the first connecting structure (11) has a disconnecting position disconnected from the second connecting structure (21). When the thermal contact (111) is in the triggering state, the first connecting structure (11) is in the disconnecting position.

2. The thermal protection battery connection bar according to claim 1, characterized in that: The second connecting structure (21) is an elastic structure. When the first connecting structure (11) is located at the disconnected position, the second end of the second connecting structure (21) moves along the length direction of the second connecting structure (21) toward the second core (20), so that the distance between the thermal contact (111) and the second end of the second connecting structure (21) is gradually enlarged.

3. The thermal protection battery connection bar according to claim 1 or 2, characterized in that: The second end of the second connection structure (21) forms a spring contact (211); when the first connection structure (11) is located at the connection position, the spring contact (211) is connected to the thermal contact (111).

4. The thermal protection battery connection bar according to claim 3, characterized in that: The spring contact (211) and the thermal contact (111) are both arc surface structures, and the spring contact (211) and the thermal contact (111) are arranged to be snap-fitted, and when the first connection structure (11) is located at the connection position, one of the spring contact (211) and the thermal contact (111) is arranged on the inner side of the other.

5. The thermal protection battery connection bar according to claim 3, characterized in that: The central axis of the spring contact (211) is perpendicular to the extension direction of the first connection structure (11), and the central axis of the thermal contact (111) is perpendicular to the extension direction of the second connection structure (21).

6. The thermal protection battery connection bar according to claim 1, characterized in that: When the thermal contact (111) is in the trigger state, the deformation direction of the thermal contact (111) is a tangent direction of the end of the thermal contact (111).

7. The thermal protection battery connection bar according to claim 3, characterized in that: The first connecting structure (11) is a bimetallic structure, comprising a first metal layer and a second metal layer, wherein the second metal layer is located at the bottom of the first metal layer, wherein the first metal layer and the second metal layer have different thermal expansion coefficients, so that relative movement occurs between the first metal layer and the second metal layer when the first connecting structure (11) is heated.

8. The thermal protection battery connection bar according to claim 3, characterized in that: The first end of the second connection structure (21) is a spring body (212), and one end of the spring body (212) away from the second core (20) is connected to the spring contact (211).

9. The thermal protection battery connection bar according to claim 1, characterized in that: The thermal protection battery connection row also includes: Shell cover (30); A shell (40), wherein the shell (40) and the shell cover (30) are arranged opposite to each other, and an accommodating cavity is formed between the shell (40) and the shell cover (30), wherein the first connecting structure (11) and the second connecting structure (21) are both located in the accommodating cavity, a portion of the first core (10) is located in the accommodating cavity, and a portion of the second core (20) is located in the accommodating cavity.

10. The thermal protection battery connection bar according to claim 1, characterized in that: At least one of the first core (10) and the second core (20) is provided with a positioning hole (50).

11. A battery, comprising a thermal protection battery connection bar, characterized in that: The thermal protection battery connection bar is the thermal protection battery connection bar according to any one of claims 1 to 10.

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