Single battery, battery pack and power utilization device

Abstract

The utility model discloses a single battery, a battery pack and a power utilization device, and belongs to the technical field of power batteries, the single battery comprises a shell, a cover plate, a battery cell and a first elastic piece, and the shell is provided with a containing cavity; the shell comprises a first side plate which is configured to define a containing cavity. The cover plate covers the accommodating cavity and is connected with the first side plate; the battery core comprises an inner core and an electrolyte, the inner core is arranged in the accommodating cavity, and the electrolyte immerses the inner core to ensure the normal work of the inner core. The first elastic piece is arranged between the inner core and the first side plate and connected with the inner core and the first side plate. The first elastic member is configured to absorb the electrolyte to expand and can apply pressure in a first direction. The battery cell is lifted in the first direction through the first elastic piece. The lifting effectively reduces the offset distance of the battery cell and reduces the risk that the tabs are torn, so that the reliability and safety of the single battery are improved. And the first elastic piece can achieve the effect of storing the electrolyte, so that the storage amount of the electrolyte is increased.

Description

Technical Field

[0001] This application belongs to the field of power battery technology, specifically relating to a single cell battery, a battery pack, and an electrical device. Background Technology

[0002] Currently, during the assembly process of blade batteries, the gap between the cell pack and the outer casing, coupled with the influence of assembly tolerances, makes the tabs of individual cells susceptible to tearing during transportation and use. This situation may not only cause a drop in the voltage of individual cells, but also lead to safety hazards and other failure issues. Utility Model Content

[0003] Purpose of the utility model: This application discloses a single battery cell, a battery pack, and an electrical device that can reduce the offset distance of the core pack to reduce the probability of the tabs being torn.

[0004] Technical solution: In a first aspect, embodiments of this application provide a single-cell battery having a first orientation, the single-cell battery comprising:

[0005] A housing having a receiving cavity, the housing including a first side plate configured to enclose the receiving cavity;

[0006] Cover plate, which seals the receiving cavity and is connected to the first side plate;

[0007] A battery cell, comprising an inner core and an electrolyte, wherein the inner core is disposed within the receiving cavity and the electrolyte is immersed in the inner core;

[0008] A first elastic element is disposed between the inner core and the first side plate, and is connected to the inner core and the first side plate respectively; the first elastic element is configured to absorb the electrolyte to expand and to apply pressure along the first direction.

[0009] In some embodiments, the expansion ratio C of the first elastic element satisfies 80% ≤ C ≤ 120%.

[0010] In some embodiments, the thickness of the first elastic member in the first direction is W, satisfying 0.3mm≤W≤1mm.

[0011] In some embodiments, the single cell has a second direction intersecting the first direction;

[0012] In the second direction, the width of the first elastic element is less than the width of the housing, and greater than or equal to 90% of the width of the inner core.

[0013] In some embodiments, the single battery cell further includes a second side plate, which is disposed opposite to the first side plate along the first direction, and both the second side plate and the first side plate are configured to surround the receiving cavity and cover the receiving cavity;

[0014] A second elastic element is provided between the second side plate and the inner core, and the second elastic element is connected to the second side plate.

[0015] In some embodiments, the cover plate is provided in one form, and the cover plate is provided with two pole terminals.

[0016] In some embodiments, the single cell also has a third direction intersecting the first direction;

[0017] The cover plate is provided in two parts, and the two cover plates are arranged opposite each other along the third direction to cover the receiving cavity. Each cover plate is provided with a pole terminal.

[0018] In some embodiments, the first elastic element has a trapezoidal cross-section.

[0019] Secondly, embodiments of this application also provide a battery pack, the battery pack comprising any of the above-mentioned individual batteries.

[0020] Thirdly, embodiments of this application also provide an electrical device, which includes any of the above-described single-cell batteries, or includes the above-described battery pack.

[0021] Several embodiments of this application have one of the following beneficial effects:

[0022] A single-cell battery is provided, in which the cell is lifted in a first direction through the design of a first elastic element. This lifting effectively reduces the offset distance of the cell, lowers the risk of the tabs being torn, and thus improves the reliability and safety of the single-cell battery. Regardless of the battery's placement, the first elastic element is designed to be located on a side wall connected to the cover plate within the casing, ensuring that the inner core is higher than the first elastic element in the vertical direction. This design ensures that the first elastic element can effectively lift the inner core after absorbing electrolyte, and can simultaneously absorb and retain electrolyte, increasing the electrolyte storage capacity. Furthermore, the first elastic element is positioned between the casing and the inner core. When the cell is charging or discharging, the inner core expands, and the first elastic element deforms accordingly, offsetting the expansion of the inner core, thereby reducing the force exerted by the inner core on the casing, lowering the possibility of casing deformation, and thus improving the safety of the single-cell battery during charging and discharging. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0024] Figure 1 This is a schematic diagram of the overall structure of a single-cell battery in the prior art;

[0025] Figure 2 This is a schematic diagram of the overall structure of another single-cell battery in the prior art;

[0026] Figure 3 A schematic diagram of the overall structure of a single-cell battery with a single elastic element provided in an embodiment of this application;

[0027] Figure 4 A schematic diagram of the overall structure of another single-cell battery with a single elastic element provided in an embodiment of this application;

[0028] Figure 5 A schematic diagram of the first tolerance provided for an embodiment of this application;

[0029] Figure 6 A schematic diagram of the second tolerance provided for an embodiment of this application;

[0030] Figure 7 A schematic diagram of the third tolerance provided for an embodiment of this application;

[0031] Figure 8 A schematic diagram of the fourth tolerance provided for an embodiment of this application;

[0032] Figure 9 A simplified schematic diagram illustrating the width of the first elastic member in a first direction, as provided in an embodiment of this application;

[0033] Figure 10 A schematic diagram of the overall structure of a single-cell battery with dual elastic elements provided in an embodiment of this application;

[0034] Figure 11 A schematic diagram of the overall structure of another single-cell battery with dual elastic elements provided in an embodiment of this application;

[0035] Figure 12 A schematic diagram of the cover plate structure of a single-sided bipolar column provided in an embodiment of this application;

[0036] Figure 13 A schematic diagram of the cover plate structure of a single-sided positive electrode post provided in an embodiment of this application;

[0037] Figure 14 A schematic diagram of the cover plate structure for a single-sided negative electrode post provided in an embodiment of this application;

[0038] Figure 15 This is a schematic diagram of the structure of the first elastic member with a trapezoidal cross-section provided in an embodiment of this application;

[0039] Figure label:

[0040] X - First direction; Y - Second direction; Z - Third direction;

[0041] 1-Core package; 2-Outer shell; 3-Top cover;

[0042] 10-Shell; 11-Receiving cavity; 12-First side plate; 13-Second side plate;

[0043] 20-Cover plate; 21-Positive electrode post; 22-Negative electrode post; 23-Injection hole;

[0044] 30 - Battery cell; 31 - Inner core; 32 - Electrode; 321 - Positive electrode; 322 - Negative electrode;

[0045] 40 - First elastic element;

[0046] 50 - Second elastic element. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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. Furthermore, although the terms "first," "second," etc., may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this application. As used herein, the term "and / or" includes any and all combinations of any one or more of the associated listed items.

[0049] In the description of this application, "multiple" means two or more, and "at least one" means one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, an angle of 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, a completely parallel angle of 10° is considered parallel.

[0050] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0051] It should also be noted that in the accompanying drawings of this application, arrows labeled X indicate the first direction X, arrows labeled Y indicate the second direction Y, and arrows labeled Z indicate the third direction Z. The introduction of the first direction X, the second direction Y, and the third direction Z is to facilitate the description of the structural positional relationships of the single battery cell, thereby aiding in understanding its structure. In the embodiments of this application, the first direction X is the height direction of the single battery cell; the second direction Y is the thickness direction of the single battery cell; and the third direction Z is the length direction of the single battery cell; furthermore, the first direction X, the second direction Y, and the third direction Z intersect each other, and are perpendicular to each other.

[0052] Currently, during the assembly process of blade batteries, the gap between the cell pack 1 and the outer casing 2, coupled with the influence of assembly tolerances, makes the tabs 32 of individual cells susceptible to tearing during transportation and use. This situation may not only cause a drop in the voltage of individual cells, but also lead to safety hazards and other failure issues.

[0053] It should be noted that the gap between the core package 1 and the outer casing 2 is filled with electrolyte, and the outer casing 2 is sealed by the top cover plate 3 to contain the electrolyte and the core package 1. Please refer to [link / reference]. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of a single-cell battery in the prior art. Figure 2 This is a schematic diagram of the overall structure of another single-cell battery in the prior art. It can be observed that the core pack 1 shifts downwards along the first direction X, causing the tabs 32 connected to the top cover plate 3 to be torn. The shift distance of the core pack 1 along the first direction X is F, and the shift distance F is the theoretical position O of the core pack 1. 理论 With respect to the actual position P of core package 1 实际 The distance between them, where the theoretical position O of core package 1. 理论 When the core package 1 is installed at the center of the outer shell 2, the distance between the core package 1 and the outer shell 2 in the first direction X, and the actual position P of the core package 1. 实际This is the minimum distance between the core package 1 and the outer shell 2 after the core package 1 is offset.

[0054] In summary, in order to reduce the probability of tab 32 being torn, the offset distance F should be minimized as much as possible, thereby reducing the risk of single cell failure and / or safety issues.

[0055] In view of this, embodiments of this application provide a single-cell battery that can reduce the offset distance F to decrease the probability of the tab 32 being torn, thereby solving at least part of the above-mentioned technical problems.

[0056] In some embodiments, please refer to Figure 3 and Figure 4 , Figure 3 A schematic diagram of the overall structure of a single-cell battery with a single elastic element provided in an embodiment of this application; Figure 4 This is a schematic diagram of the overall structure of another single-cell battery with a single elastic element provided in an embodiment of this application. This embodiment provides a single-cell battery designed to improve the stability and safety of the single-cell battery, especially reducing the impact of cell 30 displacement on the performance and safety of the single-cell battery during transportation and use. The single-cell battery includes a casing 10, a cover plate 20, a cell 30, and a first elastic element 40. The casing 10 is the external protective structure of the single-cell battery and has a receiving cavity 11. The casing 10 includes a first side plate 12, which is configured to surround the receiving cavity 11. The cover plate 20 covers the receiving cavity 11 and is connected to the first side plate 12. The cell 30 includes an inner core 31 and an electrolyte. The inner core 31 is disposed within the receiving cavity 11, and the electrolyte immerses the inner core 31 to ensure its normal operation. The first elastic element 40 is disposed between the inner core 31 and the first side plate 12 and is connected to both the inner core 31 and the first side plate 12. The first elastic element 40 is configured to absorb the electrolyte to expand and to apply pressure along a first direction X.

[0057] It should be noted that the cover plate 20 and the shell 10 can be connected by welding. After welding, the cover plate 20 and the shell 10 form a sealed space cavity 11 with a certain mechanical strength to protect the cell 30. This not only protects the cell 30 from external impacts but also prevents electrolyte leakage, further improving the safety of the single battery. This single battery design is suitable for applications requiring high safety and stability, such as electric vehicles, energy storage systems, and portable electronic devices. The shell 10 is the existing inner shell 2, and the inner core 31 is the existing inner core package 1, so it will not be described in detail in this embodiment. The cell 30 consists of the inner core 31 and the electrolyte. The inner core 31 is the core part of the single battery, responsible for the storage and release of electrical energy. The electrolyte immerses the inner core 31 to ensure the normal electrochemical reaction of the cell 30. The first elastic member 40 is disposed between the inner core 31 and the first side plate 12 and is connected to the inner core 31 and the first side plate 12 respectively. Its main function is to absorb electrolyte and expand after absorption, thereby applying pressure in the first direction X and pushing the inner core 31 away from the first side plate 12.

[0058] It should be noted that the material selection for the first elastic element 40 is diverse, and can include, but is not limited to, PE (polyethylene), PP (polypropylene), or PA (polyamide). The first elastic element 40 is connected to the first side plate 12 by adhesive bonding. This design has several advantages. First, adhesive bonding provides a strong connection, ensuring that the first elastic element 40 will not easily detach or move during use, thereby improving the overall stability of the single-cell battery. Second, adhesive materials typically possess certain elasticity and shock-absorbing properties, effectively absorbing and mitigating vibrations and impacts experienced by the battery during use, protecting the structural integrity of the inner core 31. Adhesive bonding is relatively simple and easy to operate, reducing assembly steps and time, and improving production efficiency. Adhesive materials can be selected as needed, ensuring compatibility with the materials of the first elastic element 40 and the first side plate 12, avoiding chemical reactions or material aging. Adhesive bonding allows for greater flexibility in design and manufacturing, allowing adjustment of the bonding area and position according to specific needs to adapt to different application scenarios. By using adhesive bonding to connect the first elastic element 40 and the first side plate 12, designers can improve battery performance while simplifying the manufacturing process and reducing production costs.

[0059] In this embodiment, the cell 30 is lifted in the first direction X by the design of the first elastic member 40. This lifting effectively reduces the offset distance of the cell 30, reduces the risk of the tab 32 being torn, and thus improves the reliability and safety of the single battery. Regardless of how the battery is placed, the first elastic member 40 is designed to be located on a side wall connected to the cover plate 20 in the housing 10, and ensures that the inner core 31 is higher than the first elastic member 40 in the vertical direction. This design ensures that the first elastic member 40 can effectively lift the inner core 31 after absorbing electrolyte, and can absorb electrolyte while preserving electrolyte, increasing the electrolyte storage capacity. In addition, the first elastic member 40 is disposed between the housing 10 and the inner core 31. When the cell 30 is charging and discharging, the inner core 31 expands, and the first elastic member 40 can deform accordingly to offset the expansion of the inner core 31, thereby reducing the force of the inner core 31 on the housing 10, reducing the possibility of deformation of the housing 10, and thus improving the safety of the single battery during charging and discharging.

[0060] In some embodiments, please refer to, Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 5 This is a schematic diagram of the first tolerance provided for an embodiment of this application. Figure 6 This is a schematic diagram of the second tolerance provided for an embodiment of this application. Figure 7 This is a schematic diagram of the third tolerance provided in an embodiment of this application. Figure 8 This is a schematic diagram of the fourth tolerance provided in an embodiment of this application. To further reduce the offset distance F (in millimeters) of the inner core 31 in the first direction X, thereby reducing the probability of the tab 32 being torn, this embodiment proposes that the offset distance F < the cumulative tolerance G of the tab. 总 cumulative tolerance G of the electrode 总 The tolerances include a first tolerance G1, a second tolerance G2, a third tolerance G3, and a fourth tolerance G4. The reference line is the centerline O when the battery cell 30 is installed in the center position of the housing 10. The first tolerance G1 is the tolerance of the tab 32 in the first direction X during the winding or stacking process. The second tolerance G2 is the tolerance of the tab 32 in the first direction X after it is connected to the cover plate 20. The third tolerance G3 is the tolerance of the tab 32 in the first direction X when the battery cell 30 is placed in the receiving cavity 11. The fourth tolerance G4 is the tolerance of the tab 32 in the first direction X after the cover plate 20 is connected to the housing 10.

[0061] Specifically, the first tolerance G1 is the tolerance between the first theoretical position O1 and the first actual position P1 of the electrode after the tab 32 is wound or stacked; the second tolerance G2 is the tolerance between the second theoretical position O2 and the second actual position P2 of the electrode after the tab 32 is connected to the cover plate 20; the third tolerance G3 is the tolerance between the third theoretical position O3 and the third actual position P3 of the electrode when the cell 30 is placed in the receiving cavity 11; and the fourth tolerance G4 is the tolerance between the fourth theoretical position O4 and the fourth actual position P4 of the electrode after the cover plate 20 is connected to the housing 10. The sum of the first tolerance G1, the second tolerance G2, the third tolerance G3, and the fourth tolerance G4 is the cumulative tolerance G of the electrode. 总 .

[0062] Wherein, the first theoretical position O1 of the electrode refers to the position of the electrode 32 after it is wound or stacked; the first actual position P1 of the electrode refers to the actual position of the electrode 32 in the first direction X after it is wound or stacked; and the first tolerance G1 refers to the distance between the first theoretical position O1 and the first actual position P1 in the first direction X. The second theoretical position O2 of the electrode refers to the position of the electrode 32 after it is connected to the cover plate 20; the second actual position P2 of the electrode refers to the actual position of the electrode 32 in the first direction X after it is connected to the cover plate 20; and the second tolerance G2 refers to the distance between the second theoretical position O2 and the second actual position P2 in the first direction X. The third theoretical position O3 of the tab refers to the position of the inner core 31 when the battery cell 30 is placed in the center of the receiving cavity 11 and the inner core 31 is parallel to the first side plate 12; the third actual position P3 of the tab refers to the actual position of the inner core 31 after it is placed in the receiving cavity 11; the third tolerance G3 refers to the distance between the third theoretical position O3 and the third actual position P3 of the tab in the first direction X. The fourth theoretical position O4 of the tab refers to the position of the tab 32 after the designed cover plate 20 is connected to the housing 10; the fourth actual position P4 of the tab refers to the actual position of the tab 32 in the first direction X after it is connected to the cover plate 20; the fourth tolerance G4 refers to the distance between the fourth theoretical position O4 and the fourth actual position P4 of the tab in the first direction X.

[0063] It should be noted that in the battery design, the first elastic element 40 is designed to control the offset distance F of the inner core 31 in the first direction X to be less than the cumulative tolerance G of the tabs. 总 Within this range, the probability of the tab 32 being torn can be significantly reduced. This design has several advantages. First, it reduces the risk of damage to the tab 32. When the offset distance F is less than the cumulative tolerance G of the tab... 总At the same time, the movement of the inner core 31 within the housing 10 will not exceed the maximum tolerance range that the tab 32 may exhibit during manufacturing and assembly. This means that even in extreme cases, the tab 32 will not be subjected to excessive stretching, thereby reducing the risk of tab 32 breakage or damage. Secondly, it improves battery reliability. By limiting the offset of the inner core 31, the battery can maintain higher structural integrity during use. This stability helps improve the overall reliability and lifespan of the single cell, especially in applications with high vibration or impact. In addition, it optimizes manufacturing tolerance management. The offset distance F is controlled within the cumulative tab tolerance G. 总 Within this range, tolerance accumulation issues during the manufacturing process can be better managed. This design allows for certain tolerances during manufacturing and assembly without negatively impacting battery functionality and safety. It also enhances assembly flexibility. This is achieved by considering the cumulative tolerance G of the tabs. 总 Designers have greater flexibility in the assembly process. This flexibility not only simplifies the assembly process but also reduces the stringent requirements for manufacturing precision, thereby lowering production costs. Furthermore, it improves product consistency. Controlling the offset distance helps ensure that each battery cell meets the same quality standards during production. This consistency is particularly important for mass production because it reduces the number of defective products and improves production efficiency. In summary, by controlling the offset distance F to be less than the cumulative tolerance G of the tabs... 总 Within this scope, battery design can benefit in several ways, including reducing the risk of tab 32 damage, improving battery reliability, optimizing manufacturing tolerance management, enhancing assembly flexibility, and improving product consistency.

[0064] In some embodiments, the first elastic element 40 is designed with its expansion capacity in mind to ensure that it can effectively apply appropriate pressure to the cell 30 after electrolyte absorption. Specifically, the expansion ratio C is defined as the proportion of volume change of the first elastic element 40 after absorbing electrolyte, satisfying 80% ≤ C ≤ 120%. It should be noted that the expansion ratio C of the first elastic element 40 can be any value from 80%, 85%, 90%, 95%, 100%, 105%, 110%, 115%, and 120%, or a range between any two values. This range of expansion ratio C allows the expansion ratio of the first elastic element 40 to be adjusted according to specific application requirements and environmental conditions. If the expansion ratio is below 80%, the first elastic element 40 may not be able to provide sufficient pressure to effectively support and fix the cell 30, causing the cell 30 to potentially shift during use. Conversely, if the expansion ratio C exceeds 120%, excessive pressure may be applied to the cell 30, resulting in excessive structural stress and affecting the overall performance and lifespan of the single battery cell. By controlling the expansion ratio C between 80% and 120%, the first elastic element 40 can provide appropriate support and pressure after absorbing the electrolyte, ensuring the stability of the cell 30 within the housing cavity 11. This design not only improves the safety and reliability of the individual battery cells but also adapts to different usage environments and conditions, meeting diverse application needs.

[0065] In some embodiments, please refer to Figure 9 , Figure 9 This is a simplified schematic diagram illustrating the width of the first elastic member in the first direction according to an embodiment of this application. The thickness of the first elastic member 40 in the first direction X is set to W, and its range satisfies 0.3mm ≤ W ≤ 1mm. It is understood that the thickness W of the first elastic member 40 in the first direction X can be any value or a range between any two values ​​from 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, to 1mm. It should be noted that this thickness range is designed to ensure that the first elastic member 40 provides sufficient support and pressure while maintaining its flexibility and adaptability. Specifically, the lower limit of 0.3mm ensures that the first elastic member 40 has sufficient thickness to provide the necessary support and pressure, preventing the battery cell 30 from shifting during use. The upper limit of 1mm limits the thickness to avoid applying excessive pressure to the battery cell 30, thereby preventing excessive structural stress that could affect battery performance and lifespan. In this embodiment, by controlling the thickness W of the first elastic element 40 in the first direction X between 0.3 mm and 1 mm, designers can optimize the performance of the elastic element in different application scenarios, ensuring its effective operation under various operating conditions. This design not only improves the safety and reliability of the single battery cell but also adapts to diverse usage needs.

[0066] In some embodiments, in the second direction Y, the width of the first elastic member 40 is less than the width of the housing 10 and greater than or equal to 90% of the width of the inner core 31. This design ensures that the first elastic member 40 can effectively fix and support the inner core 31 within the housing 10, while avoiding overfilling the space of the housing 10. It should be noted that by setting the width of the first elastic member 40 to be less than the width of the housing 10, it can be ensured that the first elastic member 40 has sufficient space within the housing 10 for necessary expansion and contraction, thereby accommodating changes in the volume of the cell 30. Setting the width to be greater than or equal to 90% of the width of the inner core 31 ensures that the first elastic member 40 can provide sufficient lateral support, preventing the inner core 31 from moving laterally during use. This balance in width design not only improves the stability and safety of the single battery cell but also adapts to different usage environments and conditions, meeting diverse application needs.

[0067] In some embodiments, please refer to Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the overall structure of a single-cell battery with a dual elastic element provided in an embodiment of this application. Figure 11 This is a schematic diagram of the overall structure of another single-cell battery with dual elastic elements provided in this application embodiment. The single-cell battery also includes a second side plate 13, which is disposed opposite to the first side plate 12 along a first direction X. Both the second side plate 13 and the first side plate 12 are configured to form a receiving cavity 11 and cover the receiving cavity 11. A second elastic element 50 is disposed between the second side plate 13 and the inner core 31, and the second elastic element 50 is connected to the second side plate 13. The connection between the second elastic element 50 and the second side plate 13 serves as a buffer and support. Through this design, the second elastic element 50 can effectively absorb and alleviate the mechanical stress and vibration that may be generated in the inner core 31 during use, thereby protecting the structural integrity of the inner core 31. The second elastic element 50 has the same structure as the first elastic element 40, only differing in its placement.

[0068] It should be noted that the configuration of the dual side plates and dual elastic elements in this embodiment allows the single battery cell to be placed arbitrarily along the first direction X. This ensures that both the first side plate 12 with the first elastic element 40 and the second side plate 13 with the second elastic element 50 are connected to the cover plate 20, and that either the first elastic element 40 or the second elastic element 50 is positioned below the inner core 31 in the first direction X. This configuration allows the first elastic element 40, when positioned below the inner core 31, to absorb electrolyte and expand, thereby applying pressure in the first direction X to push the inner core 31 away from the first side plate 12, while the second elastic element 50 provides a cushioning effect. Alternatively, when the second elastic element 50 is positioned below the inner core 31, it can absorb electrolyte and expand, thereby applying pressure in the first direction X to push the inner core 31 away from the first side plate 12, while the first elastic element 40 provides a cushioning effect. This flexible design not only enhances the overall stability and durability of the single battery cell but also improves its reliability and safety under various operating conditions. By allowing individual cells to be placed in different orientations without affecting their performance, this design can adapt to diverse application requirements and ensure excellent performance of individual cells in various environments. This configuration provides greater flexibility and convenience for the installation and use of individual cells.

[0069] In some embodiments, please refer to Figure 3 , Figure 10 , Figure 12 , Figure 12 This is a schematic diagram of a cover plate structure for a single-sided bipolar terminal provided in an embodiment of this application. The single-cell design uses only one cover plate 20, which integrates two terminal posts: a negative terminal post 22 and a positive terminal post 21. Both the negative terminal post 22 and the positive terminal post 21 are located on the cover plate 20. The negative terminal post 22 is electrically connected to the negative electrode tab 322 of the inner core 31, while the positive terminal post 21 is electrically connected to the positive electrode tab 321 of the inner core 31. This design ensures a clear and efficient current conduction path for the single-cell battery. Furthermore, the cover plate 20 also has an electrolyte injection hole 23 for injecting electrolyte. This design not only simplifies the battery structure, making assembly and maintenance of the single-cell battery more convenient, but also improves the sealing performance and overall reliability of the single-cell battery. By integrating all necessary connection and electrolyte injection functions onto a single cover plate 20, this design effectively reduces the number of components, lowers manufacturing costs, and adapts to various application scenarios, meeting the battery connection and maintenance needs of different devices.

[0070] In some embodiments, please refer to Figure 4 , Figure 11 , Figure 13 , Figure 14 , Figure 13 This is a schematic diagram of the cover plate structure of a single-sided positive electrode post provided in an embodiment of this application. Figure 14 This is a schematic diagram of the cover plate structure for a single-sided negative electrode post provided in an embodiment of this application. The single-cell design employs two cover plates 20, which are positioned opposite each other along the third direction Z to jointly seal the battery's receiving cavity 11. Each cover plate 20 has a terminal post, a design that allows each cover plate 20 to handle the connection of one electrode. Specifically, one cover plate 20 has a negative electrode post 22, electrically connected to the negative electrode tab 322 of the inner core 31; the other cover plate 20 has a positive electrode post 21, electrically connected to the positive electrode tab 321 of the inner core 31. This design not only ensures a clear and efficient current conduction path for the battery but also provides better structural stability and sealing. By using two cover plates 20 to handle the positive and negative electrode connections separately, this design improves the safety and reliability of the battery, reducing interference between electrodes and the risk of short circuits. Furthermore, this configuration provides greater flexibility for the assembly and maintenance of the single-cell battery, adapting to diverse application needs.

[0071] In some embodiments, please refer to Figure 15 , Figure 15 This is a schematic diagram of the structure of the first elastic member with a trapezoidal cross-section provided in an embodiment of this application. The trapezoidal cross-section of the first elastic member 40 offers several advantages. The trapezoidal cross-section provides better stability and support, especially when the battery is subjected to external pressure or vibration. The wide base of the trapezoidal structure increases the contact area, thereby improving the grip and anti-slip capability of the elastic member. Furthermore, the trapezoidal cross-section helps to evenly distribute stress, reducing localized stress concentration and thus lowering the risk of material fatigue and damage. This shape can also optimize the compression and rebound characteristics of the first elastic member 40 to some extent, enabling it to exhibit better elasticity and durability under different operating conditions. By adopting the trapezoidal cross-section of the first elastic member 40, this design not only enhances the structural integrity and reliability of the battery but also improves its adaptability and performance in various application scenarios.

[0072] Accordingly, this application also discloses a battery pack, including the single battery cells as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery cells, which will not be repeated here.

[0073] Accordingly, the electrical device described in this application includes a single battery as described in any of the foregoing embodiments, or a battery pack as described in the foregoing embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery or battery pack, which will not be repeated here.

[0074] Of course, the electrical devices referred to in this embodiment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical devices.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0076] The single battery, battery pack, and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A single-cell battery, characterized in that, Having a first orientation (X), the single cell includes: The housing (10) has a receiving cavity (11), the housing (10) including a first side plate (12) configured to surround the receiving cavity (11); Cover plate (20) covers the receiving cavity (11) and is connected to the first side plate (12); A battery cell (30) includes an inner core (31) and an electrolyte. The inner core (31) is disposed in the receiving cavity (11), and the electrolyte is immersed in the inner core (31). A first elastic element (40) is disposed between the inner core (31) and the first side plate (12) and is connected to the inner core (31) and the first side plate (12) respectively; the first elastic element (40) is configured to absorb the electrolyte to expand and to apply pressure along the first direction (X).

2. The single-cell battery according to claim 1, characterized in that, The expansion ratio C of the first elastic element (40) satisfies 80% ≤ C ≤ 120%.

3. The single-cell battery according to claim 1, characterized in that, The thickness of the first elastic element (40) in the first direction (X) is W, which satisfies 0.3mm≤W≤1mm.

4. The single-cell battery according to claim 1, characterized in that, The single cell has a second direction (Y) that intersects the first direction (X); In the second direction (Y), the width of the first elastic member (40) is less than the width of the housing (10) and greater than or equal to 90% of the width of the inner core (31).

5. The single-cell battery according to claim 1, characterized in that, The single battery also includes a second side plate (13), which is disposed opposite to the first side plate (12) along the first direction (X). Both the second side plate (13) and the first side plate (12) are configured to surround the receiving cavity (11) and cover the receiving cavity (11). A second elastic element (50) is provided between the second side plate (13) and the inner core (31), and the second elastic element (50) is connected to the second side plate (13).

6. The single-cell battery according to claim 1, characterized in that, The cover plate (20) is provided in one unit, and the cover plate (20) is provided with two pole terminals.

7. The single-cell battery according to claim 1, characterized in that, The single cell also has a third direction (Z) intersecting the first direction (X); The cover plate (20) is provided in two, and the two cover plates (20) are arranged opposite each other along the third direction (Z) to cover the receiving cavity (11). A pole terminal is provided on the cover plate (20).

8. The single-cell battery according to claim 1, characterized in that, The first elastic element (40) has a trapezoidal cross section.

9. A battery pack, characterized in that, The battery pack comprises individual cells as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, The electrical device includes a single battery as described in any one of claims 1 to 8, or includes a battery pack as described in claim 9.

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