Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises a plurality of first battery cells and a plurality of second battery cells, the first battery cells and the second battery cells are arranged at intervals in a first direction, and the adjacent first battery cells and second battery cells are arranged in a staggered manner in a second direction; the first direction is perpendicular to the second direction; wherein the first battery cell is provided with a heating element, the heating element comprises a first curing layer, a heating layer and a second curing layer, and the heating element is used for heating the first battery cell and increasing the temperature of the first battery cell. According to the battery pack, the durability of the sodium ion battery monomer in a low-temperature environment can be improved, and the influence of low temperature on the performance of the sodium ion battery monomer is reduced, so that the low-temperature charge-discharge performance and the service life of the sodium ion battery monomer are remarkably improved, and the premature decommissioning phenomenon of the battery pack is avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] With the development of new energy vehicles, battery technology has become one of the key core technologies. Lithium-ion batteries, due to their high energy density and long lifespan, have been widely used in various electric vehicles and energy storage systems. However, the shortcomings of lithium-ion batteries are becoming increasingly apparent. For example, lithium-ion batteries perform poorly in low-temperature environments, especially in cold regions or seasons, where their charge and discharge efficiency drops significantly. This severely limits the applicability of lithium-ion batteries in certain application scenarios, particularly in low-temperature environments. To overcome the low-temperature performance limitations of lithium-ion batteries, sodium-ion batteries, due to their abundant resources, good low-temperature performance, high safety, and environmental friendliness, have attracted much attention in low-speed electric vehicles and large-scale energy storage systems. However, sodium-ion batteries have relatively low energy density and short cycle life, which makes them insufficient for applications requiring high energy density, especially in the range of new energy vehicles. To compensate for the low energy density and short cycle life of sodium-ion batteries, a solution has emerged that combines lithium-ion and sodium-ion battery cells. By combining sodium-ion battery cells with lithium-ion battery cells, the lithium-ion battery cells compensate for the insufficient energy density of sodium-ion battery cells, while the sodium-ion battery cells leverage their advantages of high power and low-temperature performance, making the hybrid battery system adaptable to more application scenarios.

[0003] Traditional lithium-sodium hybrid battery pack systems employ a "sodium-ion battery cell priority start-up, lithium-ion battery cell activation after temperature rise" operating mode. In this system, sodium-ion battery cells are prioritized for activation at low temperatures to fully utilize their excellent low-temperature performance, while lithium-ion battery cells activate after temperature rise to provide higher energy density support.

[0004] However, although sodium-ion battery cells perform well when starting at low temperatures, prolonged operation at low temperatures can lead to an irreversible decline in the capacity and cycle performance of individual sodium-ion battery cells, resulting in premature degradation of the overall performance of the battery pack and even premature retirement. Utility Model Content

[0005] Therefore, it is necessary to provide a battery pack that can improve the durability of sodium-ion battery cells in low-temperature environments, thereby reducing the impact of low temperatures on their performance and preventing premature battery pack failure, in order to address the aforementioned technical problems.

[0006] This application provides a battery pack, including: a plurality of first battery cells and a plurality of second battery cells, wherein the first battery cells and the second battery cells are spaced apart in a first direction, and adjacent first battery cells and second battery cells are staggered in a second direction; the first direction is perpendicular to the second direction.

[0007] The first battery cell is provided with a heating element, which includes a first curing layer, a heating layer and a second curing layer. The heating element is used to heat the first battery cell and increase its temperature.

[0008] In one embodiment, a first curing layer is attached to a first battery cell; a heating layer is disposed between the first curing layer and the second curing layer to generate heat to heat the first battery cell; and a second curing layer is located outside the heating layer to protect the heating layer.

[0009] In one embodiment, the battery pack further includes:

[0010] The accommodating cavity includes multiple first accommodating cavities and multiple second accommodating cavities, wherein the first accommodating cavities are used to accommodate first battery cells and the second accommodating cavities are used to accommodate second battery cells.

[0011] In one embodiment, the accommodating cavity further includes a separator disposed between two adjacent battery cells; wherein the battery cell is a first battery cell or a second battery cell.

[0012] In one embodiment, the separator is a thermally conductive support member, which is connected to the accommodating cavity to conduct heat from the second battery cell to the periphery of the second battery cell.

[0013] In one embodiment, the battery pack further includes a buffer layer disposed on the outer peripheral surface of the receiving cavity.

[0014] In one embodiment, the battery pack further includes a thermally conductive layer for conducting heat from the first battery cell and / or the second battery cell; wherein the thermally conductive layer is an insulating thermally conductive layer.

[0015] In one embodiment, the battery pack further includes: a first end cover and a second end cover, the first end cover and the second end cover being respectively disposed at both ends of the accommodating cavity;

[0016] The heat-conducting layer is disposed on the side of the first end cap and the second end cap near the accommodating cavity.

[0017] In one embodiment, the heating element is disposed on the outer surface or outer peripheral surface of the first battery cell, and the first battery cell and the second battery cell are cylindrical or rectangular.

[0018] In one embodiment, the thickness of the first curing layer and the second curing layer is set between 30 micrometers and 300 micrometers, and the thickness of the heating layer is set between 80 micrometers and 120 micrometers.

[0019] The aforementioned battery pack includes: multiple first battery cells and multiple second battery cells, wherein the first and second battery cells are spaced apart in a first direction, and adjacent first and second battery cells are staggered in a second direction; the first direction is perpendicular to the second direction; wherein, a heating element is provided on the first battery cell, the heating element including a first curing layer, a heating layer, and a second curing layer, the heating element being used to heat the first battery cell and increase its temperature. This battery pack can improve the durability of sodium-ion battery cells in low-temperature environments, thereby reducing the impact of low temperatures on their performance and preventing premature battery pack failure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the battery pack structure in one embodiment;

[0022] Figure 2 This is an exploded view of the battery pack structure in one embodiment;

[0023] Figure 3 This is a diagram showing the positional relationship between the first battery cell and the heating element in one embodiment;

[0024] Figure 4 This is a top view of the accommodating cavity in one embodiment.

[0025] 10. Battery pack; 100. First battery cell; 200. Second battery cell; 300. Heating element; 400. Receiving cavity; 500. First end cap; 600. Second end cap; 402. First receiving cavity; 404. Second receiving cavity; 406. Separator; 408. Buffer layer. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] To avoid the irreversible decline in capacity and cycle performance of sodium-ion battery cells due to prolonged operation at low temperatures, please refer to... Figures 1 to 4 An embodiment of this utility model provides a battery pack 10, including a plurality of first battery cells 100 and a plurality of second battery cells 200. The first battery cells 100 and second battery cells 200 are spaced apart in a first direction, and adjacent first battery cells 100 and second battery cells 200 are staggered in a second direction. The first direction is perpendicular to the second direction. A heating element 300 is provided on the first battery cell 100. The heating element 300 includes a first curing layer, a heating layer and a second curing layer. The heating element 300 is used to heat the first battery cell 100 and increase the temperature of the first battery cell 100.

[0033] Lithium-ion batteries are widely used in various electric vehicles and energy storage systems due to their high energy density and high charge / discharge efficiency, but they have some drawbacks due to their high cost and poor low-temperature performance. Sodium-ion batteries, on the other hand, are abundant in resources, inexpensive, and have good low-temperature performance, but their energy density is relatively low. Using a combination of sodium-ion and lithium-ion batteries can leverage their respective advantages, compensate for the shortcomings of a single battery type, and thus improve overall performance and economy. Therefore, in this embodiment, the first battery cell 100 is a sodium-ion battery cell, and the second battery cell 200 is a lithium-ion battery cell. This combination of sodium-ion and lithium-ion battery cells solves the problem that a single battery type cannot simultaneously meet the requirements of high energy density, low cost, and good low-temperature performance, thereby improving the overall performance of the battery pack 10.

[0034] Optionally, the first battery cell 100 (sodium-ion battery cell) and the second battery cell 200 (lithium-ion battery cell) are alternately spaced in the first direction, and adjacent first battery cells 100 and second battery cells 200 are staggered in the second direction. See also... Figure 2The first direction is the X-axis of the coordinate system, and the second direction is the Y-axis. Specifically, the first direction is perpendicular to the second direction, and adjacent battery cells 100 and 200 are alternately distributed along the X-axis. Simultaneously, along the Y-axis, adjacent battery cells 100 and 200 are staggered, meaning they are offset from each other by a certain distance, resulting in a regular staggered distribution. Although the second battery cell 200 (lithium-ion battery cell) has a higher energy density, it generates more heat during operation, while the first battery cell 100 (sodium-ion battery cell) generates less heat. Therefore, in this embodiment, by spacing the first battery cells 100 and 200 along the first direction and staggering adjacent cells along the second direction, the first and second battery cells 100 are evenly distributed, forming a good heat conduction channel, thereby avoiding localized heat accumulation and improving the overall heat dissipation performance of the battery pack 10.

[0035] Sodium-ion battery cells are affected by factors such as slowed ion transport speed and increased electrolyte viscosity in low-temperature environments, leading to increased internal resistance, decreased capacity, and reduced charge / discharge efficiency. Furthermore, prolonged operation at low temperatures causes irreversible degradation of the sodium-ion battery's capacity and cycle performance, resulting in premature performance decline of the battery pack 10. Therefore, in this embodiment, a heating element 300 is provided on the first battery cell 100 (sodium-ion battery cell). The heating element 300 can rapidly heat the first battery cell 100 through a heating layer, maintaining its operating temperature within the optimal range. This enhances the electrochemical reactivity of the first battery cell 100 in low-temperature environments, significantly improving its low-temperature charge / discharge performance and lifespan. Optionally, each first battery cell 100 in the battery pack 10 is provided with a heating layer. The heating element 300 is composed of multiple layers, including a first curing layer, a heating layer, and a second curing layer, enabling the first battery cell 100 to rapidly heat to a suitable operating temperature in low-temperature environments, thereby improving its performance and efficiency.

[0036] In this embodiment, by spacing the first battery cell 100 and the second battery cell 200 in the first direction and staggering adjacent first battery cells 100 and second battery cells 200 in the second direction, the first battery cells 100 and second battery cells 200 can be evenly distributed, forming a good heat conduction channel, thereby avoiding local heat accumulation and improving the heat dissipation performance of the entire battery pack 10. Furthermore, a heating element 300 is provided on the first battery cell 100 (sodium-ion battery cell). The heating element 300 can rapidly heat the first battery cell 100 through the heating layer, maintaining the operating temperature of the first battery cell 100 within the optimal range. This improves the electrochemical reaction activity of the first battery cell 100 in low-temperature environments, significantly improving its low-temperature charge-discharge performance and service life, thereby preventing premature retirement of the battery pack 10.

[0037] In one exemplary embodiment, the heating layer has a multi-layer structure, specifically including a substrate layer, a conductive layer, an electrode layer, and a protective layer sequentially disposed therefrom. The conductive layer is connected to an external heating device through the electrode layer. In some specific embodiments, a temperature sensing element is provided in the battery pack to identify the operating temperature of the battery pack. When the operating temperature of the battery pack is low and heating is required, the external heating device can conduct electricity with the conductive layer through a control chip, thereby heating the conductive layer and enabling the heating layer to generate heat.

[0038] In some embodiments, the substrate material may be selected from one or more of polyethylene terephthalate (PET), polydimethylsiloxane (PDMS), polyimide (PI), polyurethane (PU), or polyethylene naphthalate (PEN). In some embodiments, the conductive layer material may be selected from graphene, conductive metals, silver nanowires, indium tin oxide, or aluminum-doped zinc oxide, etc.; the conductive layer is obtained by depositing the above materials onto the substrate and then etching them to create a pattern. In some embodiments, the electrode layer may be formed by screen printing silver paste onto the conductive layer on the side away from the substrate, followed by drying. In some embodiments, the protective layer may be a UV-curable adhesive layer or an electron beam-curable adhesive layer, such as epoxy resins, polyurethanes, and silicones.

[0039] In some specific embodiments, the thickness of the substrate layer is 10-60 μm, the thickness of the conductive layer is 3-10 nm, the thickness of the electrode layer is 10-30 μm, and the thickness of the protective layer is 10-60 μm.

[0040] In an exemplary embodiment, a first curing layer is attached to a first battery cell 100; a heating layer is disposed between the first curing layer and the second curing layer to generate heat to heat the first battery cell 100; and a second curing layer is located outside the heating layer to protect the heating layer.

[0041] For example, the first curing layer is attached to the first battery cell 100 to ensure that the heating element 300 can be stably fixed to the surface of the first battery cell 100 and will not fall off due to vibration, environmental changes, or mechanical stress. It also provides a basic mechanical protection and heat conduction path for the first battery cell 100. The heating layer is disposed between the first and second curing layers. The heating layer is the core component of the heating element 300 that realizes the heating function. The heat generated by the heating layer can be directly conducted to the first curing layer, thereby quickly transferring to the first battery cell 100, raising the temperature of the battery cell and maintaining it within the ideal operating temperature range. The second curing layer is located on the outermost side of the heating layer. The second curing layer protects the heating layer from external environmental influences, such as moisture, dust, chemicals, or mechanical wear, while providing electrical insulation to ensure that the heating layer does not interfere with external components during operation. Optionally, the heating layer achieves heating by current flowing through a conductive material with a certain resistance. When current passes through these conductive materials, electrical energy is converted into heat energy, which is released through collisions within the material, thereby heating the heating layer. The heat from the heating process is transferred to the surface of the first battery cell 100, raising the temperature of the first battery cell 100.

[0042] The heating element 300 is disposed on the outer surface or outer peripheral surface of the first battery cell 100, and the first battery cell 100 and the second battery cell 200 are cylindrical or square.

[0043] The outer surface of the first battery cell 100 refers to the outermost surface of the first battery cell 100 (i.e., the outer surface of the cylindrical or prismatic body), including the top and bottom of the first battery cell 100; the outer peripheral surface of the first battery cell 100 refers to the surrounding surface of the first battery cell 100 (the surrounding surface of the cylindrical or prismatic body), i.e., the side surface of the first battery cell 100. The heating element 300 is disposed on the outer surface or outer peripheral surface of the first battery cell 100, enabling the heating element 300 to provide a uniform heat distribution to the first battery cell 100, ensuring that the first battery cell 100 maintains a suitable operating temperature under different environmental conditions.

[0044] In this embodiment, attaching the first curing layer to the first battery cell 100 avoids directly applying the heat generated by the heating layer to the outer surface of the first battery cell 100, resulting in a more reasonable heat distribution. Furthermore, placing the heating layer between the first and second curing layers allows the heating layer to uniformly provide heat to the first battery cell 100, preventing heat concentration in a specific area. Simultaneously, by placing the heating element 300 on the outer surface or peripheral surface of the first battery cell 100, heat can be uniformly provided to all parts of the first battery cell 100, preventing localized overheating and ensuring a balanced overall temperature. This also allows for a rapid temperature increase in the first battery cell 100, thereby improving its operating temperature and low-temperature performance.

[0045] In one exemplary embodiment, the thickness of the first curing layer and the second curing layer is set between 30 micrometers and 300 micrometers, and the thickness of the heating layer is set between 80 micrometers and 120 micrometers.

[0046] The appropriate thickness of the first and second curing layers helps to enhance their mechanical strength and durability. Maintaining a suitable thickness range ensures good heat conduction without excessively affecting the uniform distribution of heat, while also providing good support for the heating layer and avoiding excessive isolation, thus ensuring that the heating layer can effectively transfer heat to the first battery cell 100. Therefore, in this embodiment, setting the thickness of the first and second curing layers between 30 micrometers and 300 micrometers effectively protects the heating layer while efficiently transferring the heat generated by it.

[0047] By rationally designing the thickness of the heating layer, it is possible to rapidly heat the first battery cell 100 in a short time. Especially during low-temperature startup, this effectively reduces the risk of cold start and improves the safety and performance of the first battery cell 100 and the battery pack 10. Setting the thickness of the heating layer between 80 micrometers and 120 micrometers achieves a good balance between heating efficiency and energy consumption.

[0048] Optionally, the first and / or second curing layers can be made of ultraviolet (UV) light-curing materials, electron beam curing materials, etc. UV light-curing materials have a very fast curing process, typically curing completely within seconds to minutes. Using UV light-curing materials can shorten production cycles and improve production efficiency. Electron beam curing materials utilize high-energy electron beams for curing, resulting in not only extremely fast curing speeds but also deep curing capabilities, meeting the needs of thick coating materials.

[0049] In this embodiment, the thicknesses of the first and second curing layers are set between 30 micrometers and 300 micrometers to ensure that they provide sufficient structural support and protection while ensuring effective heat conduction. Simultaneously, the thickness of the heating layer is set between 80 and 120 micrometers to ensure that the heating layer can effectively and evenly distribute heat to the first battery cell 100 while generating heat, avoiding heat waste or uneven heating. The first and / or second curing layers are made of UV-curable or electron beam-curable materials, ensuring high efficiency, durability, and safety of the first and second curing layers in the battery heating system.

[0050] In an exemplary embodiment, the battery pack 10 further includes a receiving cavity 400, including a plurality of first receiving cavities 402 and a plurality of second receiving cavities 404, wherein the first receiving cavities 402 are used to receive a first battery cell 100 and the second receiving cavities 404 are used to receive a second battery cell 200.

[0051] For example, the accommodating cavity 400 can be a rectangular or cubic structure, enabling it to accommodate multiple first battery cells 100 and multiple second battery cells 200 within a closed space. To facilitate the management of different types of battery cells (such as sodium-ion battery cells and lithium-ion battery cells), the interior of the accommodating cavity 400 is further divided into multiple regions, forming multiple first accommodating cavities 402 and multiple second accommodating cavities 404.

[0052] The first accommodating cavity 402 is used to accommodate the first battery cell 100, and the second accommodating cavity 404 is used to accommodate the second battery cell 200. The shapes of the first accommodating cavity 402 and the second accommodating cavity 404 are determined according to the shapes of the first battery cell 100 and the second battery cell 200, and can be cylindrical or rectangular. Furthermore, the arrangement of the plurality of first accommodating cavities 402 and the plurality of second accommodating cavities 404 is also determined according to the arrangement of the plurality of first battery cells 100 and the plurality of second battery cells 200; that is, the plurality of first accommodating cavities 402 and the plurality of second accommodating cavities 404 are spaced apart in the first direction, and adjacent first battery cells 100 and second battery cells 200 are staggered in the second direction.

[0053] Because sodium-ion batteries use sodium ions, and sodium has a larger atomic radius than lithium, they require more space to house the sodium ions and their electrolyte. This means a sodium-ion battery cell has a larger volume than a lithium-ion battery cell, and its energy density is lower. Therefore, the housing 400 needs more space to accommodate enough sodium-ion battery cells to achieve the same energy output as lithium-ion cells. Consequently, the size of the housing for sodium-ion cells must be larger than the size of the housing for lithium-ion cells; specifically, the size of the first housing 402 is larger than the size of the second housing 404.

[0054] In this embodiment, the accommodating cavity 400 includes multiple first accommodating cavities 402 and multiple second accommodating cavities 404. The multiple first accommodating cavities 402 and multiple second accommodating cavities 404 are used to respectively accommodate two different types of battery cells, achieving a more compact layout, reducing gaps, and optimizing the space utilization of the battery pack 10. Meanwhile, different types of battery cells typically have different performance characteristics; for example, sodium-ion battery cells have lower energy density, while lithium-ion battery cells have higher energy density, and the heat distribution in the battery pack 10 also differs. By accommodating the battery cells separately in different accommodating cavities, different types of battery cells can be effectively isolated, reducing mutual interference between different types of battery cells.

[0055] In an exemplary embodiment, the accommodating cavity 400 further includes a separator 406 disposed between two adjacent battery cells; wherein the battery cell is a first battery cell 100 or a second battery cell 200.

[0056] For example, the interior of the accommodating cavity 400 is divided into multiple regions by the partition 406, forming multiple first accommodating cavities 402 and multiple second accommodating cavities 404. Each accommodating cavity is used to accommodate one battery cell. The partition 406 can provide a clear partitioning structure for the battery cells in the battery pack 10. Moreover, the partition 406 is disposed between two adjacent battery cells to separate the two adjacent battery cells, ensuring the spacing between adjacent battery cells and avoiding direct contact between battery cells, thereby reducing short circuits, overheating or other possible safety risks.

[0057] The separator 406 can be configured as a heat-conducting support. The separator 406 is connected to the accommodating cavity 400 and is used to conduct the heat of the second battery cell 200 to the periphery of the second battery cell 200.

[0058] Optionally, the separator 406 not only serves as a physical barrier but also conducts heat. That is, it conducts heat generated by the second battery cell 200 from its interior to the surrounding area, effectively preventing localized overheating and reducing heat accumulation. This prevents performance degradation, shortened lifespan, or even safety issues caused by excessively high temperatures in the battery cells. The separator 406 is connected to the accommodating cavity 400, ensuring its robustness and stability. In other words, through its connection with the accommodating cavity 400, the separator 406 not only effectively isolates the battery cells but also withstands mechanical vibrations during battery pack 10 operation, maintaining its structural stability.

[0059] In this embodiment, the accommodating cavity 400 is provided with separators 406 between adjacent battery cells, dividing the interior of the accommodating cavity 400 into multiple regions, each region accommodating one battery cell. The separators 406 ensure effective isolation between the first battery cell 100 and the second battery cell 200, and also improve the safety, heat dissipation performance, and structural stability of the battery pack 10. The separators 406 are configured as thermally conductive supports to effectively conduct the heat generated by the second battery cell 200 to its surroundings, preventing heat accumulation inside the second battery cell 200, thereby helping to improve the overall heat dissipation efficiency of the battery pack 10 and preventing localized overheating.

[0060] In an exemplary embodiment, the battery pack 10 further includes a thermally conductive layer for conducting heat from the first battery cell 100 and / or the second battery cell 200; wherein the thermally conductive layer is an insulating thermally conductive layer.

[0061] During the operation of the battery pack 10, especially under conditions such as high-power charging and discharging and fast charging, individual battery cells generate a large amount of heat. If this heat cannot be dissipated effectively and in a timely manner, it may lead to battery overheating, thereby affecting battery performance and even posing safety hazards. Therefore, in this embodiment, a heat conduction layer is provided inside the battery pack 10 to conduct the heat generated by the first battery cell 100 and / or the second battery cell 200 to other parts of the battery pack 10, helping the battery pack 10 maintain a good thermal management state and ensuring stable battery operation. The heat conduction layer can also conduct the heat generated by the first battery cell 100 and / or the second battery cell 200 to the heat dissipation system of the battery pack 10.

[0062] The thermally conductive layer is an insulating thermally conductive layer, which can be made of thermally conductive silicone.

[0063] In this embodiment, the heat conduction layer is used to conduct the heat of the first battery cell 100 and / or the second battery cell 200 to other parts of the battery pack 10 or the heat dissipation system, which can prevent the local temperature inside the battery pack 10 from being too high, thereby preventing the first battery cell 100 and / or the second battery cell 200 from experiencing performance degradation or thermal runaway due to overheating.

[0064] In the previous exemplary embodiment, the battery pack 10 further includes: a first end cover 500 and a second end cover 600, the first end cover 500 and the second end cover 600 being respectively disposed at both ends of the accommodating cavity 400; wherein, a heat-conducting layer is disposed on the side of the first end cover 500 and the second end cover 600 near the accommodating cavity 400.

[0065] The first end cap 500 and the second end cap 600 are respectively disposed at both ends of the accommodating cavity 400 to seal the accommodating cavity 400 of the battery pack 10 and protect the internal battery cells from the influence of the external environment. The shapes of the first end cap 500 and the second end cap 600 are set according to the top and bottom shapes of the accommodating cavity 400.

[0066] A heat-conducting layer is disposed on the side of the first end cap 500 and the second end cap 600 near the accommodating cavity 400, so that the heat-conducting layer can transfer the heat generated by the battery cell (first battery cell 100 and / or second battery cell 200) from the accommodating cavity 400 to the first end cap 500 and the second end cap 600, and then the heat is effectively dissipated through the first end cap 500 and the second end cap 600, thereby improving the heat dissipation efficiency of the battery pack 10 and preventing local overheating of the battery pack 10.

[0067] In one exemplary embodiment, the battery pack 10 further includes a buffer layer disposed on the outer peripheral surface of the receiving cavity 400.

[0068] In practical applications, the battery pack 10 may encounter external impacts or vibrations (such as during transportation or mechanical stress during equipment operation). Therefore, in this embodiment, a buffer layer is provided on the outer peripheral surface of the accommodating cavity 400. The elasticity and energy absorption properties of the buffer layer can mitigate the impact of these external impacts or vibrations on the structure of the battery pack 10, preventing damage to the individual battery cells inside the battery pack 10. The buffer layer is typically made of materials with high elasticity and energy absorption properties, such as foam materials (e.g., polyurethane foam, ethylene-vinyl acetate copolymer foam), rubber materials, and polymer composite materials. The thickness of the buffer layer can be adjusted according to the structural design of the battery pack 10, the expected operating environment, and the required buffering effect.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery pack, characterized in that, The battery pack includes: a plurality of first battery cells and a plurality of second battery cells, wherein the first battery cells and the second battery cells are spaced apart in a first direction, and adjacent first battery cells and second battery cells are staggered in a second direction; the first direction is perpendicular to the second direction. The first battery cell is provided with a heating element, which includes a first curing layer, a heating layer and a second curing layer. The heating element is used to heat the first battery cell and increase its temperature.

2. The battery pack according to claim 1, characterized in that, The first curing layer is attached to the first battery cell; the heating layer is disposed between the first curing layer and the second curing layer, and is used to generate heat to heat the first battery cell; the second curing layer is located on the side of the heating layer away from the first battery cell, and is used to protect the heating layer.

3. The battery pack according to claim 1, characterized in that, The battery pack also includes: The accommodating cavity includes a plurality of first accommodating cavities and a plurality of second accommodating cavities, wherein the first accommodating cavities are used to accommodate the first battery cell and the second accommodating cavities are used to accommodate the second battery cell.

4. The battery pack according to claim 3, characterized in that, The accommodating cavity further includes a separator disposed between two adjacent battery cells; wherein the battery cell is either the first battery cell or the second battery cell.

5. The battery pack according to claim 4, characterized in that, The separator is a thermally conductive support component, which is connected to the accommodating cavity and is used to conduct the heat of the second battery cell to the periphery of the second battery cell.

6. The battery pack according to claim 3, characterized in that, The battery pack also includes a buffer layer disposed on the outer peripheral surface of the accommodating cavity.

7. The battery pack according to claim 3, characterized in that, The battery pack further includes a thermally conductive layer for conducting heat from the first battery cell and / or the second battery cell; wherein the thermally conductive layer is an insulating thermally conductive layer.

8. The battery pack according to claim 7, characterized in that, The battery pack further includes: a first end cap and a second end cap, wherein the first end cap and the second end cap are respectively disposed at both ends of the accommodating cavity; The heat-conducting layer is disposed on the side of the first end cap and the second end cap near the accommodating cavity.

9. The battery pack according to claim 1, characterized in that, The heating element is disposed on the outer surface or outer peripheral surface of the first battery cell, and the first battery cell and the second battery cell are cylindrical or square.

10. The battery pack according to claim 1, characterized in that, The thickness of the first curing layer and the second curing layer is set between 30 micrometers and 300 micrometers, and the thickness of the heating layer is set between 80 micrometers and 120 micrometers.

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