Anti-seismic module with flame-retardant function and dynamic anti-seismic performance and battery pack

Abstract

The invention discloses an anti-seismic module with a flame-retardant function and dynamic anti-seismic performance and a battery pack. The anti-seismic module comprises a triangular spliced anti-seismic structure and a flame-retardant dynamic anti-seismic body filled in an internal gap of the triangular spliced anti-seismic structure, the flame-retardant dynamic anti-seismic body is used for absorbing vibration force in a non-impact state, uniformly dispersing stress to the triangular spliced anti-seismic structure in an impact state, and releasing flame-retardant gas in a thermal runaway state of the battery pack; according to the present invention, the battery pack has strong flame retardation and dynamic anti-seismic performance, the T6I material of the battery pack hardens after absorbing the vibration energy during the daily driving, and cooperates with the triangular splicing structure to disperse the impact force, such that the bending of the battery module or the overhigh single-point stress can be avoided, and the stability and the safety of the battery pack can be ensured; and based on the characteristics of flame retardance and non-combustible gas release of the T6I material, flame spreading can be delayed during thermal runaway, so that the safety of the battery pack is comprehensively guaranteed, the service life is prolonged, and the safety of drivers and passengers is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a seismic-resistant module and a battery pack having flame retardant function and dynamic seismic resistance performance. Background Art

[0002] As the world pays more and more attention to environmental protection and sustainable development, the green development strategy has been vigorously promoted worldwide; in the field of transportation, the new energy vehicle industry, as an important part of green travel, is experiencing rapid development; new energy vehicles, with their advantages such as low emissions and high efficiency, have gradually become a new choice for people's daily travel, providing an effective way to alleviate the energy crisis and improve environmental quality.

[0003] Among the many core components of new energy vehicles, the battery pack plays a crucial role. It's not only the primary source of power, directly impacting the vehicle's performance and range, but also a key factor in ensuring safe operation. However, in actual use, new energy battery packs face numerous challenges, and their safety performance has become a key constraint on the further development of the new energy vehicle industry.

[0004] The driving environment of vehicles is extremely complex and ever-changing. Take urban roads, for example. With the acceleration of urbanization, urban traffic volume is increasing, and traffic is dense. Vehicles in this environment frequently start and stop, placing high demands on battery pack performance. Furthermore, while urban roads are generally relatively smooth, they still have some minor undulations and potholes. When a vehicle passes through these areas, the battery pack is subjected to continuous and irregular vibrations. While the individual impacts may be small, the accumulated impact over time can damage the battery pack's internal structure and connection stability.

[0005] The conditions on rural roads are more complicated and severe. The construction level of rural roads is relatively low, and there are often a large number of potholes and obstacles. When a vehicle is driving on a rural road, the battery pack will be subjected to stronger vibration impacts caused by large and small potholes. This strong vibration impact is more likely to cause the various components inside the battery pack to loosen, deform, and other problems, further affecting the performance and safety of the battery pack.

[0006] In addition to road conditions, vehicles may also encounter various unexpected situations during driving, such as rear-end collisions, collisions with roadblocks, etc.; these unexpected events will bring sudden and powerful impacts to the battery pack; traditional battery pack structures often expose obvious shortcomings in this situation.

[0007] In terms of vibration protection, traditional battery pack structures usually adopt simple buffering designs, such as rubber pads or foam materials. However, when faced with continuous and irregular vibrations, these buffering materials cannot effectively disperse and absorb vibration energy, resulting in the vibration being directly transmitted to the battery module. Continuous vibration will gradually loosen the connection between battery modules, undermining the stability of the internal structure of the battery. This loose connection problem may lead to poor electrical connection between battery modules, increase the internal resistance of the battery, and reduce the battery's charge and discharge efficiency, thereby affecting the performance and range of the entire new energy vehicle.

[0008] In terms of impact resistance, the outer shell of a traditional battery pack is usually made of metal. Although it has a certain strength, it is still prone to deformation and cracking when subjected to strong impact. Once the outer shell of the battery pack is damaged, the internal battery structure will inevitably be seriously affected. What is more serious is that once the sealing structure of the battery is destroyed, the electrolyte inside the battery will leak. The electrolyte is highly corrosive and conductive. Once it leaks into the battery, it is easy to cause an internal short circuit. The short circuit will cause the battery to generate a large amount of heat instantly, triggering dangerous thermal runaway. Thermal runaway will cause the battery temperature to soar instantly, leading to serious safety accidents such as fire or even explosion.

[0009] These safety issues not only seriously endanger the lives of drivers and passengers, bring great safety hazards to people's travel, but also pose a great threat to the surrounding environment; for example, the high temperature, high pressure and toxic gases generated by battery fire and explosion may cause secondary damage to surrounding people and other vehicles, and may also have long-term negative impacts on the surrounding ecological environment.

[0010] In view of the above problems, it is urgent to develop a new and efficient battery pack vibration filtering and impact resistance structure. Summary of the Invention

[0011] The purpose of the present invention is to provide a seismic module and battery pack with flame retardant function and dynamic seismic resistance performance in response to the above-mentioned problems in the prior art, thereby solving all or one of the above-mentioned problems in the prior art.

[0012] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows: In one aspect, the present invention provides a seismic module having flame retardancy and dynamic seismic resistance, comprising: A triangular splicing earthquake-resistant structure and a flame-retardant dynamic earthquake-resistant body filling the internal gaps of the triangular splicing earthquake-resistant structure; The flame-retardant dynamic seismic body is used to absorb vibration force in a non-impact state, evenly disperse stress to the triangular spliced seismic structure in an impacted state, and release flame-retardant gas in a thermal runaway state of the battery pack.

[0013] As an improved solution, the triangular splicing anti-seismic structure is installed between the battery pack and the outer frame of the battery pack; The triangular splicing earthquake-resistant structure is composed of a number of triangular units spliced together; The triangular units are connected to each other according to the size of the battery pack and the force requirements.

[0014] As an improved solution, the material of each triangular unit includes: high-strength lightweight metal, or high-strength lightweight alloy.

[0015] As an improved solution, the connection between the plurality of triangular units is by welding or riveting.

[0016] As an improved solution, the flame-retardant dynamic earthquake-resistant body is made of T6I material mixed with polyurethane and polyboron dimethylsiloxane; The flame retardant dynamic anti-vibration body is arranged in the gap of each triangular unit by injection filling.

[0017] As an improved solution, in the T6I material, the polyboronodimethylsiloxane is dispersed in polyurethane in the form of an expansion agent.

[0018] As an improved solution, in the T6I material, the content of the polyboron dimethylsiloxane is 15%-35%, and the foaming rate of the polyurethane is 40%-70%.

[0019] As an improved solution, the molecular structure of the polyboron dimethylsiloxane is used to be in a free-flowing soft state when the flame-retardant dynamic shock-resistant body is not squeezed, absorbing the external vibration energy of the battery pack and converting it into heat energy for dissipation; The molecular structure of the polyborodimethylsiloxane is used to perform molecular interlocking when the flame-retardant dynamic shock-resistant body is subjected to external impact, thereby dispersing the force exerted on the impact point to the surrounding triangular units.

[0020] As an improved solution, the polyboron dimethylsiloxane is used to release non-combustible gas based on high temperature when the battery pack is in a thermal runaway state, and stabilize the thermal runaway state of the battery pack based on the non-combustible gas.

[0021] On the other hand, the present invention further provides a battery pack, in which the anti-seismic module having flame retardant function and dynamic anti-seismic performance is installed.

[0022] The beneficial effects of the technical solution of the present invention are: 1. The anti-seismic module with flame retardancy and dynamic anti-seismic performance described in the present invention, during daily vehicle driving, efficiently captures and absorbs road vibration energy through the T6I material in its soft state, converting it into frictional heat energy for dissipation, thereby reducing the transmission of vibration into the battery pack. When encountering impacts such as collisions, the PBDMS molecules within the T6I material quickly interlock and harden, collaborating with the triangular splicing structure to form an impact-resistant system, evenly dissipating the impact force and protecting the battery pack shell and internal cells from damage. This effectively prevents loosening of battery module connections and electrode wear caused by vibration, as well as structural damage such as battery pack shell rupture and internal cell damage caused by impact. This reduces various problems caused by vibration and impact, allowing chemical reactions within the battery pack to proceed in a stable environment, thereby extending the actual service life of the battery pack, reducing replacement costs, improving the overall economic efficiency of new energy vehicles, increasing vehicle value retention, and reducing vehicle driving safety risks.

[0023] 2. The seismic module with flame retardancy and dynamic seismic resistance described in the present invention can slow the spread of flames in extreme cases of thermal runaway due to the flame retardancy of T6I material, avoiding dangerous thermal runaway caused by internal short circuits, ensuring battery pack safety, and buying time for the vehicle control system to initiate emergency measures and for the evacuation of drivers and passengers, thereby protecting their lives and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 is a schematic planar structural diagram of the anti-seismic module with flame retardant function and dynamic anti-seismic performance according to Example 1 of the present invention when installed in a battery pack from a top-down perspective; Figure 2 is a perspective schematic diagram of the internal structure of the battery pack according to Example 2 of the present invention when viewed from the front; The symbols in the accompanying drawings are described as follows: 1. Outer frame; 2. Triangular unit; 3. Flame-retardant dynamic seismic body; 4. Mounting holes; 5. Battery pack; 6. Battery unit. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0027] In the description of the present invention, it should be noted that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0028] The terms "first," "second," and the like in the specification and claims herein and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device. Example 1

[0029] This embodiment provides a seismic module with flame retardant function and dynamic seismic performance, such as Figure 1 Shown, including: A. Triangular splicing earthquake-resistant structure: In one embodiment, the triangular splicing anti-seismic structure is arranged at a predetermined position between the battery pack 5 and the outer frame 1, and is composed of a plurality of triangular units 2 that are precisely spliced together according to the size of the battery pack 5 and the actual force requirements; based on the high stability of the triangle, the structure can evenly disperse complex external forces such as road bumps and vehicle collisions in all directions, effectively avoiding stress concentration.

[0030] In one embodiment, the material of each triangular unit 2 includes, but is not limited to: a high-strength and lightweight metal or alloy material (such as aluminum alloy).

[0031] In one embodiment, each triangular unit 2 is manufactured by a precision machining process, and each triangular unit 2 is formed as follows: Figure 1 The predetermined splicing arrangement is welded or riveted to form a complete triangular splicing earthquake-resistant structural frame.

[0032] In one embodiment, the side length, angle and other dimensional data of each triangular unit 2 are set according to the size of the battery pack 5 and actual needs.

[0033] B. Flame retardant dynamic seismic body 3: In one embodiment, the flame-retardant dynamic earthquake-resistant body 3 is filled in the gap of each triangular unit 2 of the triangular spliced earthquake-resistant structure.

[0034] In one embodiment, the flame-retardant dynamic seismic body 3 is T6I material, which is a new seismic-resistant material based on a combination of polyurethane, polyboron dimethylsiloxane (PBDMS) and other auxiliary materials. It not only has dynamic seismic resistance properties, but also has good flame retardancy and durability. Among them, polyurethane is used as a matrix material to provide structural support and elasticity; PBDMS is a non-Newtonian fluid (shear thickening material) and is dispersed in the polyurethane foam in the form of an expansion agent.

[0035] In one embodiment, the PBDMS content in the T6I material is 15%-35%, and the polyurethane foaming rate in the T6I material is 40%-70%. Studies have shown that the T6I material has optimal performance when the PBDMS content is 15%-35% and the polyurethane foaming rate is 40%-70%.

[0036] In one embodiment, the T6I material is injected into the gaps of the triangular-jointed seismic-resistant structure to ensure uniform distribution of the material. In addition, care is taken to avoid the generation of bubbles during the filling process to ensure the density of the filling. After the filling is completed, the structure is preliminarily inspected to ensure that the T6I material is tightly integrated with the triangular-jointed seismic-resistant structure.

[0037] In one embodiment, the dynamic shock resistance, flame retardancy, and durability of the T6I material are described below: (i) Dynamic seismic resistance: When the flame retardant dynamic seismic body 3 is not squeezed, the PBDMS molecules therein are in a free-flowing soft state, so the T6I material that constitutes the flame retardant dynamic seismic body 3 is also in a soft state; the flame retardant dynamic seismic body 3 can efficiently absorb external vibrations during vehicle driving in this soft state, and the flame retardant dynamic seismic body 3 converts vibration energy into heat energy consumption through intermolecular friction and deformation, thereby significantly reducing the impact of vibration on the internal components of the battery pack 5.

[0038] When the battery pack 5 is subjected to external impact, the PBDMS molecules in the flame-retardant dynamic seismic body 3 quickly interlock, and the T6I material that constitutes the flame-retardant dynamic seismic body 3 becomes hard. The hardened T6I material further exerts its unique stress dispersion effect. By virtue of changes in its molecular structure, it quickly and evenly disperses the concentrated force on the impact point to the surrounding area, and then transfers the stress to the surrounding triangular units 2 (this process is similar to converting a sharp "force thorn" impact into a smooth "force surface" impact, avoiding excessive force on a certain point and dispersing the force). Finally, it works synergistically with the triangular splicing seismic structure, effectively preventing internal battery cells from being damaged due to excessive stress at a single point. At the same time, it also enhances the bending resistance of the entire battery pack 5 structure, effectively maintaining the overall shape of the battery pack 5, and preventing internal battery circuit short circuits or battery cell damage caused by bending, further ensuring the integrity and safety of the battery cells and reducing the risk to the safety of life and property of the occupants.

[0039] (ii) Flame retardancy: The key component of the T6I material, "shear-thickening fluid (i.e., polyborodimethylsiloxane)", has unique flame-retardant properties. When the battery pack 5 unfortunately experiences thermal runaway and the temperature rises sharply, the polyborodimethylsiloxane will release non-flammable gases (such as boric acid decomposition products) under the action of high temperature. This non-flammable gas can quickly dilute the oxygen concentration in the surrounding environment, forming a flame-retardant air curtain inside and around the battery pack 5, thereby effectively slowing the spread of flames. Ultimately, this not only buys valuable time to control the scope of the thermal runaway hazard, but also improves the safety of the battery pack 5 in extreme situations.

[0040] (iii) Durability: The T6I material boasts exceptional durability, a stable molecular structure, and stable chemical properties under normal use. Throughout the battery pack 5's lifespan, even after multiple vibration absorption and impact resistance tests, the T6I material's molecular structure rapidly responds to external stimuli, maintaining dynamic seismic resistance and continuously providing reliable vibration and impact protection for the battery pack 5. It also avoids performance degradation or aging and brittleness due to long-term use. It should also be noted that the T6I material operates at a temperature of -40°C to 85°C, encompassing the typical operating range of ternary lithium and lithium phosphate. Therefore, there is no risk of material degradation due to excessively high operating temperatures. Furthermore, extensive testing and practical applications have demonstrated that the T6I material maintains its unique mechanical properties even in the complex operating conditions encountered by the battery pack 5 (e.g., temperatures ranging from -40°C to 85°C, humidity levels of 10% to 95% RH, and frequent vibration and impact). This ultimately ensures its stable performance throughout the battery pack 5's lifespan.

[0041] C. Fixed components: In one embodiment, the fixing components include but are not limited to: bolts, clips and other components. The fixing components are arranged on the battery pack 5 and its outer frame 1, and are used to install the aforementioned triangular spliced seismic resistant structure filled with flame retardant dynamic seismic resistant body 3 at a predetermined position between the battery pack 5 and the outer frame 1 of the battery pack 5. At the same time, it is used to install the above structure firmly and accurately, so that the triangular spliced seismic resistant structure filled with flame retardant dynamic seismic resistant body 3 can effectively play a dynamic seismic and impact resistant role.

[0042] In one embodiment, Figure 1 As shown, the outer frame of the battery pack 5 is provided with a plurality of mounting holes 4 for connecting the triangular splicing anti-seismic structure with the battery pack 5 or the outer frame 1, namely Figure 1 The holes marked with circled symbols on all sides facilitate the precise installation and fixation of the triangular spliced earthquake-resistant structure, and the number can be increased or decreased according to actual conditions.

[0043] It should be noted that the above examples are only for explaining the present invention and are not intended to limit the scope of protection of the present invention. Example 2

[0044] This embodiment is based on the same inventive concept as the anti-seismic module with flame retardant function and dynamic anti-seismic performance described in Example 1, and provides a battery pack, such as Figure 2 As shown, the battery pack is provided with the anti-seismic module with flame retardant function and dynamic anti-seismic performance described in Example 1.

[0045] Different from the existing technology, the present application adopts a seismic module and battery pack with flame retardant function and dynamic seismic resistance, which have strong flame retardant and dynamic seismic resistance. Its T6I material hardens after absorbing vibration energy during daily driving, and cooperates with the triangular splicing structure to disperse the impact force, avoiding bending of the battery module or excessive force on a single point, thereby ensuring the stability and safety of the battery pack; based on the characteristics of T6I material that is flame retardant and releases non-flammable gas, it can delay the spread of flames in the event of thermal runaway, thereby comprehensively ensuring the safety of the battery pack, extending its life, reducing replacement costs, improving the economy and value retention rate of the vehicle, and protecting the safety of drivers and passengers.

[0046] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0047] It should also be understood that in the embodiments herein, the term "and / or" merely describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" could represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0048] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0049] Those skilled in the art will clearly understand that, for the sake of convenience and brevity of description, the specific logical process of the method described above can refer to the corresponding working processes of the systems, devices and units in the aforementioned method embodiments, and will not be repeated here.

[0050] In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices, or units, or can be an electrical, mechanical, or other form of connection.

[0051] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments herein.

[0052] In addition, the functional units in the various embodiments herein may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0053] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this article is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this article. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0054] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A seismic module with flame retardant function and dynamic seismic performance, characterized in that: include: A triangular spliced earthquake-resistant structure and a flame-retardant dynamic earthquake-resistant body (3) filled in the internal gaps of the triangular spliced earthquake-resistant structure; The flame-retardant dynamic anti-vibration body (3) is used to absorb vibration force in a non-impact state, evenly disperse stress to the triangular spliced anti-vibration structure in an impacted state, and release flame-retardant gas in a thermal runaway state of the battery pack (5).

2. The seismic module with flame retardant function and dynamic seismic resistance according to claim 1, characterized in that: The triangular spliced anti-seismic structure is installed between the battery pack (5) and the outer frame (1) of the battery pack (5); The triangular splicing anti-seismic structure is composed of a plurality of triangular units (2) spliced together; The plurality of triangular units (2) are connected to each other according to the size and force requirements of the battery pack (5).

3. The seismic module with flame retardant function and dynamic seismic resistance according to claim 2, characterized in that: The material of each triangular unit (2) includes: high-strength lightweight metal or alloy.

4. The seismic module with flame retardant function and dynamic seismic resistance according to claim 2, characterized in that: The connection between the triangular units (2) is achieved by welding or riveting.

5. The seismic module with flame retardant function and dynamic seismic resistance according to claim 2, characterized in that: The flame retardant dynamic anti-vibration body (3) is made of a T6I material mixed with polyurethane and polyboron dimethylsiloxane; The flame-retardant dynamic anti-vibration body (3) is arranged in the gap of each triangular unit (2) by injection filling.

6. The anti-seismic module with flame retardant function and dynamic anti-seismic performance according to claim 5, characterized in that: In the T6I material, the polyboronodimethylsiloxane is dispersed in polyurethane in the form of an expansion agent.

7. The seismic module with flame retardant function and dynamic seismic resistance according to claim 5, characterized in that: In the T6I material, the content of the polyborodimethylsiloxane is 15%-35%, and the foaming rate of the polyurethane is 40%-70%.

8. The seismic module with flame retardant function and dynamic seismic resistance according to claim 5, characterized in that: The molecular structure of the polyboron dimethylsiloxane is used to be in a free-flowing soft state when the flame-retardant dynamic anti-vibration body (3) is not squeezed, and absorbs the external vibration energy of the battery pack (5) and converts it into heat energy for dissipation; The molecular structure of the polyboron dimethylsiloxane is used to perform molecular interlocking when the flame-retardant dynamic anti-vibration body (3) is subjected to external impact, thereby dispersing the force exerted on the impact point to the surrounding triangular units (2).

9. The anti-seismic module with flame retardant function and dynamic anti-seismic performance according to claim 5, characterized in that: The polyboron dimethylsiloxane is used to release non-combustible gas based on high temperature when the battery pack (5) is in a thermal runaway state, and to stabilize the thermal runaway state of the battery pack (5) based on the non-combustible gas.

10. A battery pack, characterized in that: The battery pack (5) is installed with a seismic module having flame retardant function and dynamic seismic resistance as described in any one of claims 1 to 9.

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