Battery cell, battery assembly, and electric device

Abstract

This utility model discloses a battery cell, a battery assembly, and an electrical device. The battery cell includes a casing, an electrode core, and a vacuum device. The casing defines a receiving cavity, the electrode core is disposed within the receiving cavity, and the vacuum device is disposed within the receiving cavity and has a communicating air inlet and an air outlet. Both the air inlet and the air outlet are connected to the receiving cavity, and the exhaust direction of the air outlet is opposite to that of the air inlet. The vacuum device is used to extract gas from the receiving cavity through the air inlet and exhaust gas into the receiving cavity through the air outlet, thereby accelerating the gas flow within the receiving cavity. In this embodiment of the utility model, the battery cell, by incorporating the vacuum device, can extract gas from the receiving cavity during both charging and discharging processes. This increases the space inside the electrode core for storing electrolyte, thus preventing the electrolyte from being squeezed out due to electrode core expansion during charging to a certain extent. It also facilitates electrolyte reflux, thereby to some extent avoiding localized lithium plating or increased impedance in the electrode core, thereby improving the high-rate charge / discharge capability and safety performance of the battery cell.

Description

Technical Field

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

[0002] Electrolyte is the medium for ion transport within a battery cell. During the charging and discharging process of a battery cell, charge transfer is achieved between the positive and negative electrodes through the movement of ions, thus forming a current loop. For example, in a lithium-ion battery cell, lithium ions are released from the positive electrode during charging and migrate to the negative electrode through the electrolyte; during discharging, lithium ions return from the negative electrode to the positive electrode through the electrolyte. Without electrolyte, lithium ions cannot be smoothly transported between the positive and negative electrodes, and the battery cell cannot charge and discharge normally. Therefore, electrolyte is crucial for energy transfer and conversion in a battery cell.

[0003] However, the existing electrolyte is squeezed out during the charging and discharging process of the battery cell, and the return is not timely, which causes local lithium plating or increased impedance in the electrode core, thereby affecting the performance, service life and safety of the battery cell. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the primary objective of this invention is to provide a battery cell that, to a certain extent, prevents the electrolyte from being squeezed out due to core expansion during charging and avoids untimely electrolyte return during discharging, thereby preventing localized lithium plating or increased impedance at the core. This, to a certain extent, ensures the performance, lifespan, and safety of the battery cell, solving the technical problem in the prior art where a lack of electrolyte causes localized lithium plating or increased impedance at the core.

[0005] The second objective of this invention is to provide a battery assembly having the aforementioned battery cells.

[0006] The third objective of this utility model is to provide an electrical device having the aforementioned battery cell or battery assembly.

[0007] A battery cell according to an embodiment of the present invention includes: a housing having a receiving cavity; an electrode core disposed within the receiving cavity; and a suction device disposed within the receiving cavity and having an air inlet and an air outlet, the air inlet and the air outlet being connected and both being connected to the receiving cavity, the air outlet having an exhaust direction opposite to the air inlet, and the suction device being used to extract gas from the receiving cavity through the air inlet and discharge the gas into the receiving cavity through the air outlet to accelerate the gas flow within the receiving cavity.

[0008] According to the battery cell of this utility model embodiment, by setting a gas extraction device and configuring the gas extraction device to extract gas from the containment cavity, the gas in the containment cavity can be extracted through the gas inlet of the gas extraction device and discharged into the containment cavity through the gas outlet of the gas extraction device during the charging or discharging process of the battery cell. Since the exhaust direction of the exhaust port is opposite to that of the gas inlet, the gas extraction device can effectively accelerate the gas flow in the containment cavity through the cooperation of the gas inlet and the exhaust port. On the one hand, this increases the space inside the electrode core to store electrolyte, thereby preventing the electrolyte from being squeezed out due to the expansion of the electrode core during the charging process of the battery cell to a certain extent. On the other hand, it also facilitates the return of electrolyte, thereby avoiding local lithium plating or increased impedance in the electrode core to a certain extent, thus ensuring the performance, service life and safety of the battery cell to a certain extent.

[0009] In some embodiments, the air inlet is located on a first side of the air extraction device, and the exhaust outlet is located on a second side of the air extraction device, wherein the first side and the second side intersect.

[0010] In some embodiments, the air extraction device further includes an air outlet and a guide channel. In the air intake direction of the air inlet, the air outlet is disposed opposite to and communicates with the air inlet, and the air outlet is connected to the exhaust port through the guide channel.

[0011] In some embodiments, the air extraction device includes: a housing having a main body and an outer cover, the main body having an air inlet and an air outlet, the outer cover being spaced around at least a portion of the outer periphery of the main body and covering the air outlet, a guide channel being formed between the outer cover and the main body, and the outer cover or the outer cover cooperating with the main body to form an exhaust port communicating with the guide channel; and a power member disposed within the main body, the power member operating to extract gas from the receiving cavity through the air inlet and discharge the gas through the air outlet.

[0012] In some embodiments, the air inlet is located on the side of the air extraction device facing the electrode core.

[0013] In some embodiments, an assembly gap is formed between the electrode core and the outer casing, and the air extraction device is disposed within the assembly gap.

[0014] In some embodiments, the vent communicates with the assembly gap.

[0015] In some embodiments, the battery cell has a first direction parallel to the direction of gravity during the use of the battery cell, the vacuum device and the electrode core are arranged along the first direction, and the vacuum device is located at the upper end of the electrode core in the first direction.

[0016] In some embodiments, the assembly gap extends to the lower end of the pole core in the first direction.

[0017] In some embodiments, the suction device further includes a fixing member, through which the housing is mounted on the pole core.

[0018] In some embodiments, the fixing member is a clamping member, the clamping member having a support plate and two clamping plates disposed opposite each other, the two clamping plates clamping the opposite sides of the pole core at intervals to clamp the pole core, the support plate being connected to the two clamping plates respectively, and the housing being connected to the side of the support plate away from the pole core.

[0019] In some embodiments, the fixing member is insulated from the pole core.

[0020] In some embodiments, an insulating element is provided on the outer periphery of the pole core, and at least a portion of the insulating element is disposed between the fixing member and the pole core.

[0021] In some embodiments, the insulating element is an insulating and breathable membrane to allow gas located inside the electrode core to enter the extraction device through the air inlet, and / or to allow gas discharged by the extraction device to enter the electrode core.

[0022] In some embodiments, the air extraction device is electrically connected to the electrode core.

[0023] In some embodiments, the battery cell further includes wires, one of which is connected to the positive electrode of the core and the positive electrode of the power component, and the other wire is connected to the negative electrode of the core and the negative electrode of the power component.

[0024] In some embodiments, the housing is provided with a clearance opening to avoid the wire, and the wire passes through the clearance opening and is respectively connected to the pole core and the power component.

[0025] In some embodiments, the battery cell further includes a resistor connected in series with the vacuum device.

[0026] In some embodiments, the air extraction device is wrapped with a waterproof and breathable membrane, which at least covers the air inlet and the exhaust outlet. The waterproof and breathable membrane is used to prevent electrolyte from entering the air extraction device through the air inlet and the exhaust outlet, while allowing gas to enter the air extraction device through the air inlet and allowing gas in the air extraction device to be discharged through the exhaust outlet.

[0027] In some embodiments, the air extraction device includes a plurality of ports; and / or the air extraction device has a plurality of the air inlets and / or the air outlets.

[0028] The battery assembly according to an embodiment of the present invention includes at least one of the aforementioned battery cells, and a circuit structure, wherein the circuit structure and the battery cells are electrically connected.

[0029] According to the embodiments of the present invention, the battery assembly, by employing the aforementioned battery cells, can improve the performance, service life and safety of the battery assembly to a certain extent.

[0030] The electrical device according to the embodiments of the present invention includes at least one of the aforementioned battery cells or the aforementioned battery assembly.

[0031] The electrical device according to the embodiments of the present invention, by employing the aforementioned battery cells or the aforementioned battery modules, can improve the performance, service life and safety of the electrical device to a certain extent.

[0032] Additional aspects and advantages of this invention will become apparent from the description which follows, or may be learned by practice of this invention. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of a battery cell according to some embodiments of the present invention.

[0035] Figure 2 This is an isometric view of a battery cell without its outer casing, according to some embodiments of the present invention.

[0036] Figure 3 for Figure 2 A magnified view of region I in the middle.

[0037] Figure 4 This is a cross-sectional view of the air extraction device of some embodiments of the present invention, omitting the fixing component.

[0038] Figure label:

[0039] 1000, battery cell;

[0040] 100. Outer shell; 110. Receiving cavity;

[0041] 200, Extreme Core;

[0042] 300. Air extraction device;

[0043] 310. Shell;

[0044] 316. Main body; 317. Outer cover;

[0045] 311. Air intake; 312. Exhaust outlet; 313. Clearance opening;

[0046] 314. Air vent; 315. Guide channel;

[0047] 320. Power components;

[0048] 340. Fastener; 341. Support plate; 342. Clamping plate;

[0049] 500, Positive electrode lead-out section; 510, Positive electrode tab;

[0050] 600. Negative electrode lead-out section; 610. Negative electrode tab;

[0051] 700. Wire;

[0052] 900. Assembly clearance. Detailed Implementation

[0053] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0054] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0055] The following description of the battery cell 1000 according to an embodiment of the present invention is based on the accompanying drawings.

[0056] like Figure 1 As shown, the battery cell 1000 according to an embodiment of the present invention includes: a casing 100, an electrode core 200, and an air extraction device 300.

[0057] Among them, such as Figure 1As shown, the housing 100 defines a receiving cavity 110. The housing 100 can provide stable support for other components of the battery cell 1000 (such as the electrode core 200). When the battery cell 1000 is subjected to an impact force, the housing 100 can, to a certain extent, prevent other components of the battery cell 1000 from shaking or displacing, thereby ensuring the positional stability of other components of the battery cell 1000 to a certain extent.

[0058] At the same time, the outer casing 100 can also isolate the chemical substances inside the battery cell 1000 from the external environment, and to a certain extent prevent moisture and oxygen in the air from reacting with the electrodes and electrolyte inside the battery cell 1000. This helps to maintain the stability of the internal chemical system of the battery cell 1000, further reduces the self-discharge phenomenon of the battery cell 1000, and thus can extend the service life of the battery cell 1000 to a certain extent.

[0059] Furthermore, by defining a receiving cavity 110 within the housing 100, the receiving cavity 110 can provide accommodating space for other components of the battery cell 1000, thereby facilitating the installation layout of the other components of the battery cell 1000.

[0060] It should be noted that the outer casing 100 can be made of materials such as aluminum alloy or steel. Since aluminum alloy or steel have high strength, the outer casing 100 has good support strength, so that the outer casing 100 can more stably support other components of the battery cell 1000 and improve the working performance of the battery cell 1000.

[0061] like Figure 1 As shown, the electrode core 200 is disposed within the receiving cavity 110. This allows the electrode core 200 to be disposed within the outer casing 100, which isolates the electrode core 200 from the external environment. This reduces the impact of environmental factors (such as temperature, humidity, or oxygen) on the electrode core 200, thus helping to maintain the stability of the electrode core 200's performance. At the same time, the outer casing 100 can also prevent the electrode core 200 from being damaged by external impacts or compression, thereby ensuring the structural integrity of the electrode core 200 and thus guaranteeing its working performance to a certain extent.

[0062] In addition, the outer shell 100 can provide stable support for the electrode core 200, so that the various components inside the electrode core 200 (such as the positive electrode, negative electrode and separator) maintain the correct position and relative spacing, thereby ensuring the structural stability of the electrode core 200. This facilitates the smooth transport of lithium ions in the electrode core 200 and the normal progress of electrode reactions during the charging and discharging of the battery cell 1000 (such as a lithium-ion battery).

[0063] Combination Figures 1-4As shown, the suction device 300 is disposed within the receiving cavity 110 and has an inlet 311 and an outlet 312. The inlet 311 and the outlet 312 are connected and both are connected to the receiving cavity 110. The outlet 312's exhaust direction is opposite to that of the inlet 311. The suction device 300 is used to extract gas from the receiving cavity 110 through the inlet 311 and discharge the gas into the receiving cavity 110 through the outlet 312, thereby accelerating the gas flow within the receiving cavity 110. This facilitates the use of the inlet 311 of the suction device 300 to extract gas from the receiving cavity 110 during the charging and discharging process of the battery cell 1000. After the suction device 300 extracts gas from the receiving cavity 110, it is also used to discharge the extracted gas through the outlet 312. Since the exhaust direction of the outlet 312 is opposite to that of the inlet 311, it further accelerates the gas flow within the receiving cavity 110.

[0064] During the charging process of the battery cell 1000, the gas is extracted from the receiving cavity 110 through the air inlet 311 by the gas extraction device 300 and discharged into the receiving cavity 110 through the exhaust port 312 of the gas extraction device 300. This increases the space for storing electrolyte at the location where the gas is extracted inside the electrode core 200, thereby preventing the electrolyte from being squeezed out of the receiving cavity 110 due to the expansion of the electrode core 200 during charging, thus achieving the purpose of suppressing the squeezing out of the electrolyte in the electrode core 200. During the discharging process of the battery cell 1000, the gas is extracted from the receiving cavity 110 through the air inlet 311 and discharged into the receiving cavity 110 through the exhaust port 312 by the gas extraction device 300. This can accelerate the flow of gas in the receiving cavity 110, thereby facilitating the return flow of electrolyte outside the electrode core 200 and avoiding local lithium plating or increased impedance in the electrode core 200.

[0065] It is worth noting that the gas extraction device 300 of this application only promotes the flow of gas and does not discharge gas outside the receiving cavity 110.

[0066] In a specific example, the gas extraction device 300 extracts gas from a portion of the containment cavity 110 through the air inlet 311. At this time, the gas in a portion of the electrode core 200 is extracted. During the extraction process, the electrolyte can flow toward the area where the gas is extracted. At the same time, the gas extraction device 300 discharges the gas to another portion of the containment cavity 110 through the exhaust port 312. When the gas re-enters the containment cavity 110, the gas can push the electrolyte to flow toward the area where the gas is extracted, thereby promoting the flow of the electrolyte.

[0067] It should be noted that in lithium-ion batteries, localized lithium plating in the electrode core 200 leads to uneven deposition of lithium ions on the electrode surface, reducing the number of lithium ions that can participate in normal charge and discharge reactions. This reduces the total amount of electricity that the electrode core 200 can release, thereby reducing the capacity of the battery cell 1000. Increased impedance in the electrode core 200 hinders the transport of lithium ions between the electrode and the electrolyte, which also reduces the number of lithium ions that the electrode core 200 can utilize during charge and discharge, further reducing the capacity of the battery cell 1000 and affecting its range or usage time.

[0068] Therefore, by setting up a vacuum device 300, this application avoids local lithium plating or increased impedance in the electrode core 200, which can ensure the performance of the electrode core 200 to a certain extent, thereby improving the battery cell's ability to charge and discharge at a high rate of 1000 to a certain extent.

[0069] It should also be noted that in lithium-ion batteries, localized lithium plating in the core 200 can cause lithium dendrites to form on the electrode surface. The continuous growth of these lithium dendrites may puncture the separator, causing a short circuit between the positive and negative electrodes of the core 200, thus permanently damaging the core 200. In addition, the uneven distribution of lithium ions during the lithium plating process leads to uneven volume changes in the electrode material. Long-term accumulation can cause cracks and detachment in the electrode material, damaging the electrode structure and further reducing the effective active area of ​​the electrode material, accelerating the aging of the core 200 and thus shortening its cycle life. The increased impedance of the core 200 will also cause the battery cell 1000 to bear greater stress during charging and discharging, accelerating the aging and damage of the electrode material and further shortening the lifespan of the battery cell 1000.

[0070] Therefore, by setting up a vacuum device 300, this application avoids local lithium plating or increased impedance in the electrode core 200, which can extend the service life of the electrode core 200 to a certain extent, thereby extending the service life of the battery cell 1000 to a certain extent.

[0071] Furthermore, localized lithium plating and increased impedance in the core 200 will cause the battery cell 1000 to generate more heat during charging and discharging, raising its temperature. When the temperature of the battery cell 1000 exceeds a certain limit, it will trigger a series of side reactions inside the battery cell 1000, such as electrolyte decomposition and electrode material thermal decomposition. These side reactions will further release heat, thus forming a vicious cycle, which may lead to thermal runaway of the battery cell 1000, causing safety accidents such as fire or explosion.

[0072] Therefore, by setting up a vacuum device 300, this application avoids local lithium plating and increased impedance in the electrode core 200, which can ensure the safety of the electrode core 200 to a certain extent, thereby improving the safety of the battery cell 1000 to a certain extent.

[0073] In summary, by setting up the vacuum device 300, this application avoids local lithium plating or increased impedance in the electrode core 200, which can, to a certain extent, ensure the performance of the electrode core 200, extend its service life, and improve its safety. This, in turn, improves the high-rate charge and discharge capability of the battery cell 1000, extends its service life, and enhances its safety.

[0074] As can be seen from the above structure, the battery cell 1000 of this embodiment of the present invention, by setting a gas extraction device 300, and using the gas inlet 311 of the gas extraction device 300 to extract the gas in the receiving cavity 110, can extract the gas in the receiving cavity 110 during the charging or discharging process of the battery cell 1000. This increases the space inside the electrode core 200 to store electrolyte, thereby preventing the electrolyte from being squeezed out due to the expansion of the electrode core 200 during charging to a certain extent. At the same time, the gas is discharged into the receiving cavity 110 through the exhaust port 312 of the gas extraction device 300, and the exhaust direction of the exhaust port 312 is set to be opposite to the gas inlet. 311, so that the exhaust device 300 can exhaust gas away from the air inlet 311 through the exhaust port 312, avoiding the gas from being directly discharged to the air inlet 311, so as to accelerate the gas flow in the receiving cavity 110, thereby facilitating the backflow of electrolyte during the discharge of the battery cell 1000, thereby avoiding local lithium plating or increased impedance in the electrode core 200, and to a certain extent ensuring the performance of the electrode core 200, extending the service life of the electrode core 200, and improving the safety of the electrode core 200, thereby improving the high-rate charge and discharge capability of the battery cell 1000, extending the service life of the battery cell 1000, and improving the safety of the battery cell 1000.

[0075] Understandably, compared to the prior art, this application sets up a gas extraction device 300, and uses the gas inlet 311 of the gas extraction device 300 to extract the gas in the receiving cavity 110 and the gas is discharged into the receiving cavity 110 through the exhaust port 312, thereby accelerating the gas flow in the receiving cavity 110. On the one hand, this allows the space inside the electrode core 200 to store electrolyte, which can suppress the electrolyte from being squeezed out due to the expansion of the electrode core 200 to a certain extent. On the other hand, it can also promote the return flow of electrolyte.

[0076] In some embodiments, combined with Figure 2 , Figure 3 and Figure 4As shown, the air inlet 311 is located on the first side of the suction device 300, and the exhaust outlet 312 is located on the second side of the suction device 300, with the first and second sides intersecting. This arrangement allows the air inlet 311 and exhaust outlet 312 to be located on different sides of the suction device 300, ensuring that the exhaust direction of the exhaust outlet 312 is opposite to that of the air inlet 311. This allows the gas discharged through the exhaust outlet 312 to flow away from the air inlet 311, thereby accelerating the gas flow within the receiving cavity 110.

[0077] In specific examples, combined Figures 1-4 As shown, the air inlet 311 is located on the lower side of the air extraction device 300, and the exhaust port 312 is located on the left side and / or right side of the air extraction device 300, so that the air inlet 311 and the exhaust port 312 are located on different sides of the air extraction device 300, thereby allowing the exhaust direction of the exhaust port 312 to be set away from the air inlet 311.

[0078] In some embodiments, such as Figure 4 As shown, the extraction device 300 also includes an air outlet 314 and a guide channel 315. In the air intake direction of the air inlet 311, the air outlet 314 is positioned opposite to and connected to the air inlet 311. The air outlet 314 is connected to the exhaust outlet 312 via the guide channel 315. This allows the gas entering the extraction device 300 through the air inlet 311 to effectively flow to the exhaust outlet 312. Consequently, after the extraction device 300 extracts gas from the receiving cavity 110 through the air inlet 311, the gas can be effectively discharged into the receiving cavity 110 through the exhaust outlet 312, thereby accelerating the gas flow within the receiving cavity 110.

[0079] In a specific example, since the air outlet 314 and the air inlet 311 are arranged opposite to each other and are connected to each other, when the air extraction device 300 extracts the gas in the receiving cavity 110 through the air inlet 311, the gas in the air extraction device 300 first flows toward the air outlet 314 and passes through the air outlet 314. Since the air outlet 314 is connected to the exhaust port 312 through the guide channel 315, the gas flowing through the air outlet 314 can then flow to the exhaust port 312 through the guide channel 315, so that the gas can be discharged into the receiving cavity 110 through the exhaust port 312.

[0080] In some embodiments, such as Figure 4As shown, the air extraction device 300 includes a housing 310, which has a main body 316 and an outer cover 317. The main body 316 has an air inlet 311 and an air outlet 314. The outer cover 317 is spaced around at least a portion of the outer periphery of the main body 316 and covers the air outlet 314. A guide channel 315 is formed between the outer cover 317 and the main body 316. The outer cover 317, or the outer cover 317 and the main body 316, cooperate to form an exhaust port 312 communicating with the guide channel 315. This configuration allows the air extraction device 300 to have an air outlet 314 and a guide channel 315, reducing the molding difficulty of the air outlet 314 and the guide channel 315. This ensures that the gas entering the air extraction device 300 through the air inlet 311 can effectively flow to the exhaust port 312 for easy discharge.

[0081] In some embodiments, such as Figure 4 As shown, the outer cover 317 and the main body 316 cooperate to form an exhaust port 312 that connects to the guide channel 315, so as to reduce the molding difficulty of the exhaust port 312.

[0082] Of course, in some other embodiments, the exhaust port 312 of the connecting guide channel 315 can also be defined by the outer cover 317 itself (e.g., an opening is made on the outer cover 317).

[0083] In some embodiments, such as Figure 4 As shown, the extraction device 300 also includes a power unit 320, which is located within the main body 316. The power unit 320 operates to extract gas from the receiving cavity 110 through the air inlet 311 and discharge the gas through the air outlet 314. This allows the extraction device 300 to effectively extract gas from the receiving cavity 110 through the air inlet 311 and discharge the gas into the receiving cavity 110 through the exhaust outlet 312, thereby accelerating the gas flow within the receiving cavity 110 and ensuring the working performance of the extraction device 300.

[0084] Meanwhile, by placing the power component 320 inside the main body 316, on the one hand, the power component 320 is placed inside the housing 310, which facilitates the use of the housing 310 to support and protect the power component 320; on the other hand, the power component 320 can be placed close to the air inlet 311 and the air outlet 314, so as to ensure that the power component 320 can effectively draw gas from the receiving cavity 110 through the air inlet 311 and discharge the gas through the air outlet 314 when it is running.

[0085] In some embodiments, such as Figure 4As shown, the air inlet 311 and the air outlet 314 are located on opposite side walls of the main body 316. The power unit 320 is located inside the main body 316 and between the air inlet 311 and the air outlet 314, so as to further ensure that the power unit 320 can effectively draw gas from the receiving cavity 110 through the air inlet 311 and discharge the gas through the air outlet 314 when it is running.

[0086] In some embodiments, the power component 320 is a rotating component. The rotation of the rotating component enables the air extraction device 300 to perform air extraction, which facilitates the extraction of gas from the receiving cavity 110 through the air inlet 311 and the discharge of gas through the air outlet 314.

[0087] In some embodiments, combined with Figure 2 , Figure 3 and Figure 4 As shown, the air inlet 311 is located on the side of the suction device 300 facing the electrode core 200. This allows the air inlet 311 to be directly facing the electrode core 200, thereby facilitating the extraction of gas inside the electrode core 200 and increasing the space inside the electrode core 200 for storing electrolyte.

[0088] In some embodiments, such as Figure 1 As shown, an assembly gap 900 is formed between the electrode core 200 and the outer casing 100, and the vacuum device 300 is disposed within the assembly gap 900. The assembly gap 900 facilitates the installation of the vacuum device 300, allowing it to be placed within the receiving cavity 110. Simultaneously, the assembly gap 900 prevents interference between the vacuum device 300 and other components of the battery cell 1000 (such as the electrode core 200), thus ensuring the normal operation of the vacuum device 300.

[0089] Furthermore, by placing the air extraction device 300 inside the receiving cavity 110, the air extraction device 300 is placed inside the outer casing 100, which facilitates the use of the outer casing 100 to support and protect the air extraction device 300, improves the positional stability of the air extraction device 300, and helps to extend the service life of the air extraction device 300.

[0090] In some embodiments, such as Figure 1 As shown, the pole core 200 is disposed inside the housing 100, and at least a portion of the pole core 200 is spaced apart from the housing 100, so as to form an assembly gap 900 between the pole core 200 and the housing 100 and reduce the molding difficulty of the assembly gap 900.

[0091] In some embodiments, combined with Figure 1 , Figure 2 and Figure 3 As shown, the exhaust port 312 is connected to the assembly gap 900. In this way, the gas discharged through the exhaust port 312 can be discharged to the assembly gap 900, which facilitates the return of electrolyte.

[0092] In some embodiments, combined with Figure 1 , Figure 2 and Figure 3 As shown, the battery cell 1000 has a first direction, which is parallel to the direction of gravity during the use of the battery cell 1000. The gas extraction device 300 and the electrode core 200 are arranged along the first direction, and the gas extraction device 300 is located at the upper end of the electrode core 200 in the first direction. Since the gas density is low, the gas will rise towards the upper end of the electrode core 200 in the first direction. By placing the gas extraction device 300 at the upper end of the electrode core 200 in the first direction, the gas extraction device 300 can extract the gas more quickly, ensuring the working performance of the gas extraction device 300 and allowing more space inside the electrode core 200 to store electrolyte.

[0093] At the same time, the use of the vacuum device 300 can also improve the flow of gas to a certain extent, thereby promoting the return of electrolyte.

[0094] In a specific example, the first direction can be understood as... Figure 1 The up and down directions are shown in the diagram.

[0095] It should be noted that the suction device 300 can be located at any position on the upper part of the electrode core 200 in the first direction. Specifically, when the suction device 300 is located on the upper part of the electrode core 200 in the first direction, it can be positioned near the left side, the right side, or even the center of the electrode core 200. The specific position of the suction device 300 can be determined based on the gas accumulation situation, as long as it is positioned at the upper part of the gas accumulation area. This application does not impose any restrictions on the specific location of the suction device 300.

[0096] In a specific example, since the gas accumulation area is typically located at the middle of the upper end of the electrode core 200 in the first direction, therefore, as Figure 1 As shown, the present application places the gas extraction device 300 at the upper end of the electrode core 200 in the first direction and near the middle of the electrode core 200, so that the gas extraction device 300 can extract the gas more quickly, avoid the electrolyte being squeezed out, and facilitate the electrolyte to flow back towards the electrode core 200, thereby promoting the replenishment of electrolyte in the gas accumulation area and benefiting the normal operation of the electrode core 200.

[0097] In some embodiments, such as Figure 1As shown, the assembly gap 900 extends to the lower end of the electrode core 200 in the first direction. This allows the gas drawn and discharged by the pumping device 300 to flow towards the lower end of the electrode core 200, thereby facilitating the use of gas to compress or push the electrolyte at the lower end of the electrode core 200 back towards the upper end of the electrode core 200. This ensures that the electrolyte reaches the upper end of the electrode core 200 in a timely manner, thereby preventing local lithium plating or increased impedance in the electrode core 200 to a certain extent, and ensuring the performance, service life, and safety of the electrode core 200.

[0098] In some embodiments, such as Figure 1 As shown, the assembly gap 900 extends to the bottom of the electrode core 200 in the first direction. This facilitates the direct delivery of gas extracted by the pumping device 300 to the bottom of the electrode core 200 via the assembly gap 900, thereby allowing the gas in the assembly gap 900 to compress or push the electrolyte at the bottom of the electrode core 200 back towards the upper end of the electrode core 200.

[0099] In some embodiments, such as Figure 1 As shown, the outer periphery of the pole core 200 and the outer shell 100 are spaced apart to form an assembly gap 900 between the outer periphery of the pole core 200 and the outer shell 100, and the assembly gap 900 can extend to the lower end of the pole core 200 in the first direction.

[0100] It should be noted that when there is an assembly gap 900 between the outer periphery of the pole core 200 and the outer shell 100, a support member can be provided at the bottom of the pole core 200. The support member connects the outer shell 100 and the pole core 200 respectively, so as to support the pole core 200 and ensure the positional stability of the pole core 200.

[0101] It should also be noted that this application directly uses the assembly gap 900 to define the gas flow path, which allows the gas to flow in a predetermined direction while also simplifying the structure of the battery cell 1000.

[0102] Of course, in some other embodiments, an exhaust device may be provided inside the housing 100, which is connected to the exhaust port 312, so that the gas can flow in a predetermined direction.

[0103] In a specific example, when the gas flows to the bottom of the electrode core 200, because the gas has a low density, it will rise and flow towards the top of the electrode core 200. This causes the gas to exert a force on the electrolyte at the bottom of the electrode core 200. The gas continuously squeezes or pushes the electrolyte back towards the top of the electrode core 200, which can further replenish the electrolyte at the top of the electrode core 200, thereby improving the working performance of the electrode core 200.

[0104] In some embodiments, such as Figure 4As shown, the suction device 300 has multiple exhaust ports 312. The multiple exhaust ports 312 can accelerate the gas compression or push the electrolyte at the bottom of the electrode core 200 back towards the upper end of the electrode core 200, so that the electrolyte can be replenished to the required position at the upper end of the electrode core 200 more quickly.

[0105] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0106] In specific examples, such as Figure 4 As shown, the vacuum device 300 of this application has two exhaust ports 312, which are located on opposite sides of the vacuum device 300. The two exhaust ports 312 squeeze or push the electrolyte located on both sides of the bottom of the electrode core 200 toward the upper end of the electrode core 200, thereby enabling the electrolyte to flow back to the upper end of the electrode core 200 quickly and evenly.

[0107] In some embodiments, the air extraction device 300 has a plurality of air inlets 311. The plurality of air inlets 311 working together can increase the air extraction efficiency of the air extraction device 300.

[0108] Of course, the air extraction device 300 may also be provided with only one exhaust port 312 and one air inlet 311. The specific number of exhaust ports 312 and air inlets 311 is not limited in this application.

[0109] In some embodiments, combined with Figure 2 and Figure 3 As shown, the suction device 300 also includes a fixing member 340, and the housing 310 is mounted on the pole core 200 through the fixing member 340. While reducing the difficulty of fixing the suction device 300, it can also improve the positional stability of the suction device 300, avoid the suction device 300 from shaking or displacing under external impact, and thus ensure the positional stability of the suction device 300, thereby ensuring the working performance of the suction device 300.

[0110] In some embodiments, the housing 310 and the fastener 340 can be fixedly connected by means of adhesive bonding or welding. It should be noted that this application does not limit the specific method of fixing the air extraction device 300 and the fastener 340.

[0111] In some embodiments, combined with Figure 2 and Figure 3As shown, the fixing member 340 is a clamping member, which has a support plate 341 and two opposing clamping plates 342. The two clamping plates 342 are spaced apart and clamp the electrode core 200 on opposite sides to secure it. The support plate 341 is connected to the two clamping plates 342 respectively, and the housing 310 is connected to the side of the support plate 341 away from the electrode core 200. This allows the housing 310 to be installed on the electrode core 200 via the fixing member 340, and reduces the installation difficulty of the vacuum device 300.

[0112] In some embodiments, the fixing member 340 is insulated from the electrode core 200. This ensures the safety of the electrode core 200 and the vacuum device 300, thereby guaranteeing the safety of the battery cell 1000 in use.

[0113] In some embodiments, an insulating member (not shown in the figure) is provided on the outer periphery of the electrode core 200, and at least part of the insulating member is disposed between the fixing member 340 and the electrode core 200. This achieves an insulating fit between the fixing member 340 and the electrode core 200, thereby preventing direct electrical contact between the electrode core 200 and the vacuum device 300 to a certain extent, thus ensuring the safety of the electrode core 200 and the vacuum device 300, and thus ensuring the safety of the battery cell 1000 in use.

[0114] In some embodiments, the insulating element is an insulating and breathable membrane to allow gas located inside the electrode core 200 to enter the vacuum device 300 through the air inlet 311, and / or to allow gas discharged from the vacuum device 300 to enter the electrode core 200. This enables gas circulation, increases the space inside the electrode core 200 for storing electrolyte, and facilitates the return of electrolyte in the electrode core 200.

[0115] In some embodiments, the insulating element is a polyurethane breathable membrane, a polypropylene microporous membrane, or a polyethylene microporous membrane.

[0116] In some embodiments, the suction device 300 is electrically connected to the electrode core 200. The electrode core 200 can provide a certain amount of electrical energy to the suction device 300, which converts the electrical energy into mechanical energy, thereby enabling the suction device 300 to maintain normal suction and exhaust operations.

[0117] In some embodiments, such as Figure 2As shown, the electrode core 200 has a positive tab 510 and a negative tab 610, which are spaced apart on both sides of the electrode core 200. The positive tab 510 and the negative tab 610 reduce the difficulty of connecting the electrode core 200 to the external circuit to a certain extent. During the discharge process of the battery cell 1000, the positive tab 510 and the negative tab 610 facilitate the better extraction and transmission of the current inside the electrode core 200 to the external circuit. During the charging process of the battery cell 1000, the positive tab 510 and the negative tab 610 introduce the current from the external circuit and transmit it to the inside of the electrode core 200 for storage, thereby ensuring the working performance of the battery cell 1000.

[0118] In some embodiments, such as Figure 1 As shown, the battery cell 1000 also includes a positive electrode lead 500 and a negative electrode lead 600, which are spaced apart on both sides of the housing 100. The positive electrode lead 500 is electrically connected to the positive electrode tab 510, and the negative electrode lead 600 is electrically connected to the negative electrode tab 610. The positive electrode lead 500 and the negative electrode lead 600 further reduce the difficulty of electrically connecting the positive electrode tab 510 and the negative electrode tab 610 to the external circuit, so as to facilitate the transmission of the current received by the positive electrode tab 510 and the negative electrode tab 610 to the external electrical device, thereby providing sufficient power to the electrical device and ensuring its normal operation.

[0119] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the battery cell 1000 also includes wires 700, one of which is connected to the positive terminal of the electrode core 200 and the positive terminal of the power component 320, and the other wire 700 is connected to the negative terminal of the electrode core 200 and the negative terminal of the power component 320. This achieves an electrical connection between the vacuum device 300 and the electrode core 200, enabling the electrode core 200 to supply power to the vacuum device 300, thus allowing the vacuum device 300 to start and operate normally.

[0120] In specific examples, such as Figure 2 As shown, one wire 700 is connected to the positive electrode tab 510 of the electrode core 200 and the positive electrode of the power component 320, respectively, and the other wire 700 is connected to the negative electrode tab 610 of the electrode core 200 and the negative electrode of the power component 320, respectively.

[0121] In summary, this application uses the built-in circuit of the electrode core 200 to supply power to the vacuum device 300. During the discharge process of the battery cell 1000, the electrode core 200 can provide a small amount of electrical energy to the vacuum device 300, which can then start the vacuum device 300.

[0122] In some embodiments, such as Figure 4As shown, the housing 310 is provided with a clearance opening 313 to avoid the guide wire 700. The guide wire 700 passes through the clearance opening 313 and is connected to the pole core 200 and the power component 320 respectively. This realizes the electrical connection between the air extraction device 300 and the pole core 200.

[0123] Meanwhile, the clearance opening 313 can reduce the difficulty of electrical connection between the air extraction device 300 and the positive electrode 510 and the negative electrode 610 respectively, thereby ensuring the normal operation of the air extraction device 300.

[0124] In other embodiments, the power source of the vacuum device 300 can also be pressure, which can be gas pressure or electrolyte liquid pressure. When the power source is gas pressure, the vacuum device 300 can convert the energy of the gas pressure into mechanical energy to provide working power for the vacuum device 300. When the power source is electrolyte liquid pressure, it can be understood that the vacuum device 300 makes full use of the physical processes of volume expansion and contraction of the electrode core 200, electrolyte extrusion and reflux. Specifically, the electrolyte is transported to the vacuum device 300, and the vacuum device 300 can convert the energy of this liquid pressure into mechanical energy to provide working power for the vacuum device 300.

[0125] In some other embodiments, the power source of the vacuum device 300 can also be obtained from the heat generated when the electrode core 200 is working. Since there is an electrochemical reaction inside the electrode core 200 during the charging and discharging process of the battery cell 1000, a certain amount of heat is generated along with the occurrence of the electrochemical reaction. This part of the heat causes the temperature of the electrode core 200 to change continuously. The vacuum device 300 can convert this part of the heat from thermal energy into mechanical energy in order to provide working power for the vacuum device 300.

[0126] It is worth noting that the starting energy of the vacuum device 300 comes only from the electrical energy of the electrode core 200. After the vacuum device 300 is started, the energy that keeps the vacuum device 300 working normally can be the electrical energy of the electrode core 200, pressure energy (gas pressure and electrolyte liquid pressure) or heat energy.

[0127] In some embodiments, the energy from electrical energy, pressure energy (gas pressure and electrolyte liquid pressure), and thermal energy can work together to power the normal operation of the pumping device 300.

[0128] In some embodiments, the battery cell 1000 further includes a resistor (not shown) connected in series with the vacuum device 300. The resistor can prevent short circuits in the electrode core 200, further prevent overheating and internal structural damage to the electrode core 200, and prevent thermal runaway (such as fire or explosion) in the battery cell 1000, thereby ensuring the safety and performance of the battery cell 1000.

[0129] In some embodiments, the vacuum device 300 is covered with a waterproof and breathable membrane (not shown in the figure). The waterproof and breathable membrane covers at least the air inlet 311 and the exhaust port 312. The waterproof and breathable membrane is used to prevent electrolyte from entering the vacuum device 300 through the air inlet 311 and the exhaust port 312, while allowing gas to enter the vacuum device 300 through the air inlet 311 and allowing gas inside the vacuum device 300 to be discharged through the exhaust port 312. While enabling the vacuum device 300 to draw gas from the receiving cavity 110 through the air inlet 311 and discharge gas into the receiving cavity 110 through the exhaust port 312, it can also prevent the vacuum device 300 from drawing electrolyte into the interior of the vacuum device 300 during the vacuuming process, and prevent electrolyte from entering the interior of the vacuum device 300 through the air inlet 311 and the exhaust port 312 when the vacuum device 300 is not working, thereby avoiding the electrolyte from affecting the normal operation of the vacuum device 300.

[0130] In some embodiments, the waterproof and breathable membrane may be made of materials such as thermoplastic polyurethane, polytetrafluoroethylene, or expanded polytetrafluoroethylene. Thermoplastic polyurethane, polytetrafluoroethylene, or expanded polytetrafluoroethylene all have good waterproof and breathable properties, which enables the waterproof and breathable membrane to also have good waterproof and breathable properties.

[0131] It should be noted that the waterproof and breathable membrane can also be made of other materials with good waterproof and breathable properties. This application does not limit the specific material of the waterproof and breathable membrane.

[0132] In some embodiments, the vacuuming device 300 has multiple components. Multiple vacuuming devices 300 can improve the vacuuming effect of the vacuuming device 300 to a certain extent, avoiding localized lithium plating or increased impedance in the electrode core 200. This can, to a certain extent, ensure the performance of the electrode core 200, extend its service life, and improve its safety, thereby improving the high-rate charge / discharge capability of the battery cell 1000, extending its service life, and enhancing its safety.

[0133] It should be noted that the vacuum device 300 of this application is applicable to all lithium-ion batteries in which the electrode core 200 expands and contracts during charging and discharging.

[0134] The battery assembly of this utility model is described below according to an embodiment.

[0135] The battery assembly according to an embodiment of the present invention includes at least one battery cell 1000 and a circuit structure.

[0136] Among them, battery cell 1000 is the aforementioned battery cell 1000. The specific structure of battery cell 1000 will not be described in detail here. The circuit structure is electrically connected to battery cell 1000 to ensure the working performance of battery cell 1000.

[0137] According to the embodiments of the present invention, by employing the aforementioned battery cell 1000, the performance and safety of the battery assembly can be improved to a certain extent.

[0138] It should be noted that the battery components mentioned here can be battery packs or battery modules.

[0139] The following describes the electrical device according to an embodiment of the present invention.

[0140] The electrical device according to the embodiments of the present invention includes at least one battery cell 1000 or battery assembly.

[0141] Among them, the battery cell 1000 is the aforementioned battery cell 1000, and the battery module is the aforementioned battery module. The specific structures of the battery cell 1000 and the battery module will not be described in detail here.

[0142] The electrical device according to the embodiments of the present invention can improve the performance and safety of the electrical device to a certain extent by using the aforementioned battery cell 1000 or battery module.

[0143] It should be noted that the electrical devices mentioned here can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0144] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; 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.

[0145] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0146] Figure 4The diagram shows two exhaust ports 312 for illustrative purposes. However, after reading the above technical solution, a person skilled in the art will obviously understand that the solution can be applied to a solution with three, four, five or more exhaust ports 312, which would also fall within the protection scope of this utility model.

[0147] Other components of the battery cell 1000, battery assembly, and electrical device according to embodiments of the present invention, such as the specific structure of the electrode core 200, are known to those skilled in the art and will not be described in detail here.

[0148] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0149] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: The outer casing (100) is provided with a receiving cavity (110); The electrode core (200) is disposed within the receiving cavity (110); An air extraction device (300) is provided in the receiving cavity (110) and has an air inlet (311) and an air outlet (312). The air inlet (311) and the air outlet (312) are connected and both the air inlet (311) and the air outlet (312) are connected to the receiving cavity (110). The exhaust direction of the air outlet (312) is opposite to that of the air inlet (311). The air extraction device (300) is used to extract gas in the receiving cavity (110) through the air inlet (311) and discharge the gas into the receiving cavity (110) through the air outlet (312) to accelerate the gas flow in the receiving cavity (110).

2. The battery cell of claim 1, wherein, The air inlet (311) is located on the first side of the air extraction device (300), and the exhaust port (312) is located on the second side of the air extraction device (300), with the first side intersecting the second side.

3. The battery cell of claim 2, wherein, The air extraction device (300) further includes an air outlet (314) and a guide channel (315). In the air intake direction of the air inlet (311), the air outlet (314) is arranged opposite to the air inlet (311) and communicates with it. The air outlet (314) is connected to the exhaust port (312) through the guide channel (315).

4. The battery cell according to claim 3, characterized in that, The air extraction device (300) includes: A housing (310) having a main body (316) and an outer cover (317), wherein the main body (316) has an air inlet (311) and an air outlet (314), the outer cover (317) is spaced and fitted around at least a portion of the outer periphery of the main body (316) and covers the air outlet (314), a guide channel (315) is formed between the outer cover (317) and the main body (316), and the outer cover (317) or the outer cover (317) and the main body (316) cooperate to form an exhaust port (312) communicating with the guide channel (315); A power unit (320) is provided inside the main body (316). The power unit (320) operates to draw gas from the receiving cavity (110) through the air inlet (311) and discharge the gas through the air outlet (314).

5. The battery cell according to claim 1, characterized in that, The air inlet (311) is located on the side of the air extraction device (300) facing the pole core (200).

6. The battery cell according to claim 1, characterized in that, An assembly gap (900) is formed between the pole core (200) and the outer shell (100), and the air extraction device (300) is disposed within the assembly gap (900).

7. The battery cell according to claim 6, characterized in that, The exhaust port (312) is connected to the assembly gap (900).

8. The battery cell according to claim 7, characterized in that, The battery cell has a first direction, which is parallel to the direction of gravity of the battery cell during use. The vacuum device (300) and the electrode core (200) are arranged along the first direction, and the vacuum device (300) is located at the upper end of the electrode core (200) in the first direction.

9. The battery cell according to claim 8, characterized in that, The assembly gap (900) extends to the lower end of the pole core (200) in the first direction.

10. The battery cell according to claim 4, characterized in that, The air extraction device (300) also includes a fixing member (340), and the housing (310) is mounted on the pole core (200) via the fixing member (340).

11. The battery cell according to claim 10, characterized in that, The fixing member (340) is a clamping member, which has a support plate (341) and two clamping plates (342) arranged opposite to each other. The two clamping plates (342) are clamped at intervals on opposite sides of the pole core (200) to clamp the pole core (200). The support plate (341) is connected to the two clamping plates (342) respectively. The housing (310) is connected to the side of the support plate (341) away from the pole core (200).

12. The battery cell according to claim 11, characterized in that, The fixing member (340) is in an insulating fit with the pole core (200).

13. The battery cell according to claim 12, characterized in that, An insulating element is provided on the outer periphery of the pole core (200), and at least a portion of the insulating element is disposed between the fixing member (340) and the pole core (200).

14. The battery cell according to claim 13, characterized in that, The insulating element is an insulating and breathable membrane to allow gas located inside the pole core (200) to enter the pumping device (300) through the air inlet (311), and / or to allow gas discharged from the pumping device (300) to enter the pole core (200).

15. The battery cell according to claim 4, characterized in that, The air extraction device (300) is electrically connected to the pole core (200).

16. The battery cell according to claim 15, characterized in that, It also includes wires (700), one of which is connected to the positive terminal of the pole core (200) and the positive terminal of the power component (320), and the other wire (700) is connected to the negative terminal of the pole core (200) and the negative terminal of the power component (320).

17. The battery cell according to claim 16, characterized in that, The housing (310) is provided with a clearance opening (313) to avoid the conductor (700). The conductor (700) passes through the clearance opening (313) and is connected to the pole core (200) and the power component (320) respectively.

18. The battery cell according to claim 15, characterized in that, It also includes a resistor connected in series with the air extraction device (300).

19. The battery cell according to claim 1, characterized in that, The air extraction device (300) is covered with a waterproof and breathable membrane, which at least covers the air inlet (311) and the exhaust port (312). The waterproof and breathable membrane is used to prevent electrolyte from entering the air extraction device (300) through the air inlet (311) and the exhaust port (312), while allowing gas to enter the air extraction device (300) through the air inlet (311) and allowing gas in the air extraction device (300) to be discharged through the exhaust port (312).

20. The battery cell according to any one of claims 1-19, characterized in that, The air extraction device (300) includes a plurality of ports; and / or the air extraction device (300) has a plurality of the air inlets (311) and / or the air outlets (312).

21. A battery assembly, characterized in that, It includes at least one battery cell according to any one of claims 1-20, and a circuit structure, wherein the circuit structure and the battery cell are electrically connected.

22. An electrical appliance, characterized in that, It includes at least one battery cell according to any one of claims 1-20 or a battery assembly according to claim 21.

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