Battery and electronic device

Abstract

The utility model relates to battery safety technical field, the utility model provides a kind of battery and electronic equipment, including shell, pole post being arranged in the end wall of shell, built-in bare cell and current collecting component, lower plastic and high temperature resistance sheet in end wall inside. Among them, high temperature resistance sheet is directly transmitted to the direct transmission of high temperature gas and expansion pressure generated by bare cell when thermal runaway by physical isolation obstruction, significantly reduce the risk of pole post melting or mechanical impact fracture due to thermal shock. High temperature resistance sheet forms reinforced support structure, improves the deformation resistance of shell end, suppresses end wall deformation. This design can maintain the structural integrity and electrical connection stability of pole post and shell in the needle test, reduce the deformation amplitude of shell, and improve the needle test pass rate.

Description

Technical Field

[0001] This utility model relates to the field of battery safety technology, and in particular to a battery and electronic device. Background Technology

[0002] With the rapid expansion of the number of new energy vehicles, the reliability of power battery systems has become increasingly prominent, especially with a significant upward trend in vehicle spontaneous combustion accidents caused by battery thermal runaway.

[0003] When a battery generates high-pressure gas due to abnormal operating conditions such as thermal runaway, the high-temperature gas flow will impact the terminals (usually made of aluminum). The high-pressure gas and drastic temperature rise released instantaneously during thermal runaway inside the cell can cause severe deformation or even rupture at one end of the casing corresponding to the terminal, causing the casing to lose its seal and exacerbating the risk of heat diffusion. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to propose a battery and electronic device to improve battery safety.

[0005] To achieve the above and other related objectives, this utility model provides a battery, comprising:

[0006] case;

[0007] Bare battery cell, wherein the bare battery cell is disposed inside the housing;

[0008] A pole post is disposed on the end wall of the first end of the housing;

[0009] A current collector includes a tab connection portion and a terminal connection portion. The tab connection portion is connected to the bare battery cell, and the terminal connection portion protrudes from the tab connection portion and is welded to the terminal.

[0010] The lower plastic is disposed on the side of the end wall of the first end of the housing near the bare battery cell;

[0011] A high-temperature resistant sheet is located on the side of the current collector facing the end wall. The high-temperature resistant sheet includes a first part and a second part. The first part protrudes from the second part and forms a receiving groove on the side facing the current collector for accommodating the pole connection. The second part is annularly connected to the side of the first part away from the pole.

[0012] In an optional embodiment of this utility model, the second part of the high-temperature resistant sheet is attached to the side of the current collector that is away from the bare battery cell.

[0013] In an optional embodiment of this utility model, a through hole is provided on the side of the first part near the pole post, and the through hole avoids the welding area between the pole post and the current collector.

[0014] In an optional embodiment of this utility model, the diameter of the through hole is smaller than the diameter of the pole post connection portion near the end of the pole post.

[0015] In an optional embodiment of this utility model, the area of ​​the pole post connection portion exposed in the through hole is larger than the area covered by the first part of the groove bottom.

[0016] In an optional embodiment of the present invention, the edge of the second portion is aligned with the edge of the current collecting member, or the edge of the second portion abuts against the sidewall of the housing in the second direction.

[0017] In an optional embodiment of this invention, the melting point of the high-temperature resistant sheet is higher than the melting point of the electrode post.

[0018] In an optional embodiment of this utility model, the material strength of the high-temperature resistant sheet is greater than the material strength of the pole.

[0019] In an optional embodiment of this utility model, the high-temperature resistant sheet is made of polyimide or carbon fiber, fiberglass, mica sheet, or ceramic.

[0020] This invention also proposes an electronic device, including the aforementioned battery.

[0021] The technical advantages of this invention are as follows: By incorporating a high-temperature resistant sheet, the invention effectively prevents the high-temperature gas and expansion pressure generated by the bare cell during thermal runaway from directly acting on the terminals, significantly reducing the risk of terminals melting due to thermal shock or breaking due to mechanical impact. This design maintains the structural integrity between the terminals and the casing under thermal runaway conditions, improving the safety protection level of the cell under extreme operating conditions. It also makes the deformation of the casing end wall controllable and significantly reduces the probability of terminal failure, thereby effectively improving the nail penetration test pass rate and meeting the high safety requirements of power battery applications. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] In the attached diagram:

[0024] Figure 1This is a schematic diagram of the battery structure in one embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of the current collecting component in one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the high-temperature resistant sheet in one embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional view of the high-temperature resistant sheet in one embodiment of the present invention;

[0028] Figure 5 This is a cross-sectional view of the high-temperature resistant sheet and current collector assembly in one embodiment of the present invention.

[0029] The attached figures are labeled as follows:

[0030] 10. Housing; 20. Terminal post; 30. Bare cell; 40. Current collector; 41. Terminal post connection; 42. Terminal tab connection; 50. Lower plastic; 60. High temperature resistant sheet; 61. First part; 62. Through hole; 63. Second part. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0034] In cylindrical batteries, the two ends are typically equipped with terminals and a pressure relief valve. The terminals serve as the battery's current output terminals and are connected to the external circuitry, while the pressure relief valve is used to release pressure in the event of thermal runaway within the battery. Thermal runaway refers to the phenomenon where the temperature and pressure inside the battery rise rapidly due to overcharging / discharging, short circuits, or external factors, usually accompanied by violent reactions such as battery expansion and gas release. In this situation, the pressure relief valve's function is to rapidly expel the high-temperature, high-pressure gases generated inside the battery to prevent battery explosion or other catastrophic consequences.

[0035] However, in some cases, if the high-temperature, high-pressure gas is not released in a timely manner, it may impact the battery terminal, causing deformation of the battery casing at that end, manifesting as an outward bulge. As the deformation intensifies, the terminal hole may also expand, leading to the terminal detaching from the casing. Furthermore, the battery terminals are typically made of aluminum, which has a relatively low melting point. When a high-temperature gas stream directly impacts the terminal, it may melt, further causing the terminal to detach from the casing. In this situation, the high-temperature, high-pressure gas inside the battery may leak from the terminal hole, increasing the risk of thermal runaway.

[0036] Especially in vehicle battery applications, some car models have battery designs where the terminal hole side typically faces the passenger compartment. If high-temperature, high-pressure gas leaks from the terminal hole, it could pose a potential danger to the passenger compartment and even injure the occupants.

[0037] To solve the above technical problems, such as Figure 1 As shown, this utility model proposes a battery. The following scheme takes a cylindrical battery as an example, including a casing 10, a bare cell 30, a terminal post 20, a current collector 40, a lower plastic 50, and a high-temperature resistant sheet 60.

[0038] The casing 10 is the outer shell of the battery, which serves to protect the internal components of the battery.

[0039] The bare cell 30 is located inside the casing 10. The bare cell 30 is the core component of the battery, typically composed of positive and negative electrode materials, electrolyte, etc. The bare cell 30 is the location where high-temperature, high-pressure gas flow is generated during thermal runaway.

[0040] The terminal 20 is the current output terminal of the battery. The terminal 20 transmits the battery's electrical energy to the external circuit through electrical connection. A terminal hole is opened on the end wall of the first end of the housing 10, and the terminal 20 passes through the terminal hole and is fixed to the end wall by riveting.

[0041] The lower plastic 50 is disposed on the side of the end wall of the first end of the housing 10 near the bare cell 30. The lower plastic 50 is mainly used to prevent contact between the internal components of the battery (such as the bare cell 30, current collector 40, etc.) and the housing 10, and has the functions of insulation and protection to prevent short circuits.

[0042] like Figure 2 As shown, the current collector 40 includes a tab connection portion 42 and a terminal connection portion 41. The tab connection portion 42 is connected to the tab of the bare cell 30 to ensure that the internal current of the battery flows into the current collector 40 through the tab connection portion 42. The tab connection portion 42 has a flat plate structure.

[0043] The terminal connection portion 41 protrudes from the terminal tab connection portion 42 and is welded to the end of the terminal 20 near the bare cell 30. The terminal connection portion 41 provides an electrical connection to the terminal 20, allowing the battery's electrical energy to be transferred to an external circuit through the terminal 20.

[0044] The current collector 40 is located between the bare cell 30 and the terminal 20. In other words, during thermal runaway, the current collector 40 is located on the path from the bare cell 30 to the terminal 20 where the high temperature and high pressure airflow is transmitted.

[0045] The high-temperature resistant sheet 60 is located on the side of the current collector 40 facing the end wall. This means that the high-temperature resistant sheet 60, corresponding to the current collector 40, is also located on the path of the high-temperature, high-pressure gas flow from the bare cell 30 to the terminal post 20. In this way, the high-temperature resistant sheet 60 can effectively prevent the high-temperature gas generated by the bare cell 30 during thermal runaway from directly acting on the terminal post 20 and prevent the expansion pressure from directly acting on the end of the terminal post 20, significantly reducing the risk of the terminal post 20 melting due to thermal shock, and also reducing the risk of the casing 10 at the end of the terminal post 20 breaking due to pressure impact.

[0046] The high-temperature resistant sheet 60 includes a first part 61 and a second part 63. The first part 61 protrudes from the second part 63 and has a receiving groove formed on the side facing the current collector 40 for accommodating the pole connection part 41. The receiving groove is used to position the pole connection part 41, and the arrangement of the receiving groove can maximize the coverage area of ​​the high-temperature resistant sheet 60.

[0047] The second part 63 is connected in a ring shape to the side of the first part 61 away from the pole post 20. The second part 63 is the main part that obstructs the high-temperature and high-pressure airflow. The second part 63 has a continuous annular planar structure to ensure its heat insulation and flow obstruction capabilities.

[0048] Overall, the design of the high-temperature resistant sheet 60 increases the protection of the terminal post 20 position in the battery structure, effectively reducing the risk of structural damage caused by thermal runaway and improving the safety and reliability of the battery under extreme conditions.

[0049] In an optional embodiment of this invention, due to the presence of the high-temperature resistant sheet 60, the current collector 40 corresponding to the high-temperature resistant sheet 60 can adopt a non-perforated design. In conventional solutions, to save costs and reduce weight, the current collector 40 may employ a perforated design. This perforated design typically creates airflow channels, allowing high-temperature airflow to more easily reach the battery's terminal post 20. The non-perforated design, however, seals these paths with a tighter structure, effectively reducing the direct impact of hot airflow on the location of the terminal post 20.

[0050] like Figure 1 , 5 As shown, in an optional embodiment of this utility model, the second portion 63 of the high-temperature resistant sheet 60 is attached to the side of the current collector 40 facing away from the bare cell 30. The side of the current collector 40 facing the bare cell 30 needs to be connected to the tab of the bare cell 30 to ensure that the current conduction path of the battery is unobstructed. Attaching the second portion 63 of the high-temperature resistant sheet 60 to the side of the current collector 40 facing away from the bare cell 30 avoids the high-temperature resistant sheet 60 directly affecting the connection between the current collector 40 and the tab. This ensures stable current output of the battery and avoids poor contact or unstable connection due to improper design.

[0051] like Figure 3 , 4 As shown in Figure 5, in an optional embodiment of this utility model, a through hole 62 is provided on the side of the first part 61 near the electrode post 20. The through hole 62 avoids the welding area between the electrode post 20 and the current collector 40. The design of the through hole 62 partially exposes the electrode post connection part 41, retaining the contact area required for electrical connection and preventing the setting of the high-temperature resistant sheet 60 from affecting the connection between the electrode post 20 and the current collector 40. By avoiding interference with the welding area, the high-temperature resistant sheet 60 can continue to play its role in thermal isolation and structural protection without affecting the welding strength, thereby improving the overall performance and safety of the battery.

[0052] like Figure 3 , 5 As shown, in an optional embodiment of this utility model, the diameter of the through hole 62 is smaller than the diameter of the end of the electrode connection 41 near the electrode 20 (non-interference fit). That is, the bottom of the groove of the first part 61 is divided into an annular structure, which covers a portion of the area of ​​the electrode connection 41 near the electrode 20. This maximizes the coverage area of ​​the first part 61 without affecting the connection area between the electrode 20 and the electrode connection 41. In this way, the high-temperature resistant sheet 60 can more effectively block the high-temperature airflow generated by thermal runaway, preventing these high-temperature gases from directly acting on the location of the electrode 20, and reducing the risk of the electrode 20 melting or detaching due to excessively high temperature.

[0053] like Figure 3 , 4As shown in Figure 5, in an optional embodiment of this invention, the area of ​​the terminal connection portion 41 exposed in the through hole 62 is larger than the area covered by the bottom of the first portion 61. Ensuring sufficient exposure of the welding area effectively guarantees a low-impedance connection of the battery. This means that the transmission of current between the terminal 20 and the current collector 40 is not restricted, reducing contact resistance and improving the battery's conductivity. The battery will perform more stably under high load conditions and can transfer electrical energy more efficiently.

[0054] like Figure 5 As shown, in an optional embodiment of this invention, the edge of the second portion 63 is aligned with the edge of the current collector 40. This design optimizes the assembly and docking of the high-temperature resistant sheet 60 and the current collector 40, simplifying the assembly process on the production line. Improved alignment accuracy between components reduces human error and enhances the consistency and efficiency of the assembly process. By ensuring all components are correctly aligned, production speed can be increased and production costs reduced. Furthermore, alignment enhances the overall integrity of the assembled product and reduces potential loosening issues.

[0055] In an optional embodiment of this invention, the edge of the second portion 63 abuts against the sidewall of the housing 10 in a second direction. The second direction is as follows: Figure 1 As shown in the transverse direction, by forming a physical barrier in the second direction, the gap between the edge of the second part 63 and the housing 10 is effectively isolated. This design prevents the high-temperature gas flow generated during thermal runaway from passing between the edges of the housing 10 and the second part 63 and directly impacting the location of the electrode post 20. If the high-temperature gas flow directly acts on the electrode post 20, it may cause the electrode post 20 to melt, deform, or detach. Through this transverse physical barrier, the hot gas flow is effectively blocked, thereby reducing the risk of the electrode post 20 melting and detaching due to high temperature. This design further enhances the thermal insulation capability of the high-temperature resistant sheet 60 because the physical barrier formed by the transverse support closes the channel of the hot gas flow, thereby preventing the hot gas flow from spreading outside the collector member 40. The high-temperature resistant sheet 60 can provide more comprehensive thermal insulation, especially in the event of thermal runaway, effectively slowing down the diffusion of high-temperature gas flow to the electrode post 20 and the housing 10.

[0056] In an optional embodiment of this invention, the melting point of the high-temperature resistant sheet 60 is higher than that of the electrode post 20. If the melting point of the high-temperature resistant sheet 60 is too low during the release of high-temperature and high-pressure gases, it may melt, losing its barrier effect against the high-pressure gas flow. This design ensures that the melting point of the high-temperature resistant sheet 60 is higher than that of the electrode post 20, thus preventing it from melting even at extreme temperatures and continuing to provide effective isolation from high-temperature gas flow and pressure waves. This continuous isolation significantly reduces the risk of high-temperature gas flow directly impacting the electrode post 20.

[0057] This design ensures that, in the event of thermal runaway leading to a rapid increase in internal temperature, the high-temperature resistant sheet 60 can prioritize maintaining its structural integrity, forming a stable thermal barrier and mechanical support. Through this characteristic, the high-temperature resistant sheet 60 can slow down the conduction of high temperature to the electrode post 20 region, preventing the electrode post 20 from melting or softening due to excessively rapid local temperature rise. Simultaneously, its high melting point ensures that under the impact of high-temperature and high-pressure gas flow, the high-temperature resistant sheet 60 will not lose its pressure-blocking ability due to self-melting, thereby continuously weakening the direct destructive effect of high-temperature and high-pressure gas impact on the electrode post 20. This design, through differentiated matching of material temperature resistance characteristics, enhances the active protection effect of the high-temperature resistant sheet 60 on the electrode post 20 during thermal runaway, providing more durable physical isolation and thermal buffering for the electrode post 20 under extreme conditions, reducing the risk of electrical connection interruption and sealing failure of the housing 10.

[0058] In an optional embodiment of this invention, the material strength of the high-temperature resistant sheet 60 is greater than that of the electrode post 20, such as carbon fiber. In the event of thermal runaway, if the material strength of the electrode post 20 is low, it may undergo plastic deformation or mechanical fracture due to excessive stress.

[0059] When the high-temperature resistant sheet 60 has high material strength, it can preferentially withstand the impact from the internal high-pressure gas, preventing these stresses from acting directly on the location of the terminal 20. This design allows the high-temperature resistant sheet 60 to form a rigid support barrier, slowing down the transmission of impact forces and enhancing the battery's impact resistance. Especially under high-pressure conditions, it can effectively protect the location of the terminal 20 from damage caused by excessive deformation. The high strength of the high-temperature resistant sheet 60 also maintains the relative positional accuracy between the terminal 20 and the current collector 40, ensuring the reliability of the physical contact of the electrical connection.

[0060] In an optional embodiment of this invention, the high-temperature resistant sheet 60 is made of polyimide, carbon fiber, fiberglass, mica, or ceramic as a substrate, adapting to different operating conditions based on their respective properties. Polyimide combines high temperature resistance, high insulation, and flexibility, allowing it to withstand internal deformation of the casing 10 while blocking the transmission of high temperature and pressure. Carbon fiber, as a high-strength and lightweight material, can not only withstand significant pressure impacts but also reduce the weight of the high-temperature resistant sheet 60. In battery design, reducing weight helps improve the battery's energy density and overall performance. Fiberglass is a composite material that combines strength and corrosion resistance. It also has good high-temperature resistance, effectively isolating heat flow and reducing the danger of thermal runaway. Mica is a natural insulating material with excellent high-temperature resistance, enabling it to effectively maintain its insulating effect and prevent heat from diffusing into the electrode post 20 area under extreme thermal runaway conditions. Mica also has excellent electrical insulation properties, making it suitable for applications requiring high electrical isolation and ensuring battery safety under high-voltage environments. Ceramics perform particularly well in high-temperature environments, preventing temperature conduction caused by thermal runaway. Ceramic materials have high hardness and wear resistance, which can effectively resist mechanical stress and prevent cracking or deformation under high-pressure gas impact.

[0061] This invention also proposes an electronic device, including the aforementioned battery. Specifically, the electronic device can be a battery pack, a new energy vehicle, a two-wheeled electric vehicle, an energy storage system, a portable device, etc. In new energy vehicles (such as electric vehicles and plug-in hybrid electric vehicles), using this battery design can effectively cope with extreme situations such as thermal runaway, improve battery safety, ensure stable operation over a long period, and reduce the risks associated with high temperatures. In two-wheeled electric vehicles (such as electric motorcycles and electric bicycles), the battery design directly affects the performance and safety of the entire vehicle. Using this battery design can improve the safety of the entire vehicle, especially under high temperature and high pressure environments, ensuring reliable battery operation. This battery can also be widely used in energy storage systems, particularly in home, industrial, or commercial-scale energy storage devices, providing more efficient energy storage and release while ensuring stability and safety under high temperature environments. Devices such as drones and portable power supplies can also use this battery design to ensure the safety and stability of the device during long-term use.

[0062] In summary, this invention effectively reduces the risk of the battery terminal 20 being impacted by high-temperature and high-pressure gas in the event of thermal runaway by designing a high-temperature resistant sheet 60. The high-temperature resistant sheet 60 provides thermal isolation and pressure buffering, preventing the terminal 20 from melting, detaching, or damaging the battery casing 10 due to thermal shock. Furthermore, the high strength and high melting point of the high-temperature resistant sheet 60 ensure that it maintains structural integrity under extreme conditions and prevents high-temperature gas flow from directly impacting the terminal 20, significantly improving the safety and reliability of the battery in the event of thermal runaway. By optimizing the non-perforated design of the current collector 40, precise alignment, and avoidance of the welding area, this technical solution further improves the battery's conductivity and assembly process consistency, reduces potential contact problems or unstable connections, ensures stable battery performance under high loads and extreme environments, and reduces the risk of electrical connection interruption and casing 10 sealing failure, thereby significantly improving the overall safety and lifespan of the battery. Simultaneously, the through-hole 62 design precisely avoids the welding area, achieving a balance between maximizing coverage area and maintaining low-impedance electrical connections. High melting point (superior to the pole 20 material) and high-strength substrate (such as polyimide and ceramic) ensure structural integrity and continuous protection under extreme conditions.

[0063] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery, characterized in that, include: Shell (10); Bare battery cell (30), the bare battery cell (30) is disposed inside the housing (10); A pole post (20) is disposed on the end wall of the first end of the housing (10); The current collector (40) includes a tab connection (42) and a terminal connection (41). The tab connection (42) is connected to the bare cell (30), and the terminal connection (41) protrudes from the tab connection (42) and is welded to the terminal (20). The lower plastic (50) is disposed on the side of the end wall of the first end of the housing (10) near the bare cell (30); A high-temperature resistant sheet (60) is located on the side of the current collector (40) facing the end wall. The high-temperature resistant sheet (60) includes a first part (61) and a second part (63). The first part (61) protrudes from the second part (63) and forms a receiving groove on the side facing the current collector (40) for accommodating the pole connection part (41). The second part (63) is connected in an annular shape to the side of the first part (61) away from the pole (20).

2. The battery according to claim 1, characterized in that, The second part (63) of the high-temperature resistant sheet (60) is attached to the side of the current collector (40) away from the bare cell (30).

3. The battery according to claim 2, characterized in that, The first part (61) has a through hole (62) on the side near the pole post (20), and the through hole (62) avoids the welding area between the pole post (20) and the current collector (40).

4. The battery according to claim 3, characterized in that, The diameter of the through hole (62) is smaller than the diameter of the end of the pole post connection (41) near the pole post (20).

5. The battery according to claim 3, characterized in that, The area of ​​the pole post connection (41) exposed in the through hole (62) is larger than the area covered by the bottom of the first part (61).

6. The battery according to claim 3, characterized in that, The edge of the second part (63) is aligned with the edge of the flow collector (40), or the edge of the second part (63) abuts against the sidewall of the housing (10) in the second direction.

7. The battery according to any one of claims 1-6, characterized in that, The melting point of the high-temperature resistant sheet (60) is higher than that of the pole (20).

8. The battery according to any one of claims 1-6, characterized in that, The material strength of the high-temperature resistant sheet (60) is greater than that of the pole (20).

9. The battery according to any one of claims 1-6, characterized in that, The high-temperature resistant sheet (60) is made of polyimide or carbon fiber, fiberglass, mica sheet, or ceramic.

10. An electronic device, characterized in that, Includes the battery as described in any one of claims 1 to 9.

Images