A single cell and a battery pack

Abstract

This application relates to the field of batteries and discloses a single-cell battery and a battery pack. The single-cell battery includes a housing, an electrode assembly, a top cover, and a liquid storage device. The housing has a receiving cavity in which electrolyte is contained. The electrode assembly is disposed in the receiving cavity and has a central hole that extends through the electrode assembly along a first direction. The top cover is connected to the housing and seals the receiving cavity. The liquid storage device is disposed within the central hole and is used to absorb and store the electrolyte and release the electrolyte under pressure. This application utilizes a liquid storage device disposed within the central hole of the electrode assembly. This storage device can absorb and store electrolyte and release electrolyte under pressure, thereby accelerating the wetting of the electrolyte into the electrode assembly during the electrolyte injection process and shortening the time required for post-injection wetting.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a single cell battery and a battery pack. Background Technology

[0002] Lithium-ion batteries are widely used in electric vehicles, energy storage systems, and other fields due to their advantages such as high energy density and long cycle life. However, the electrolyte wetting process in battery manufacturing also faces efficiency bottlenecks; traditional cells need to be left to stand for a long time after electrolyte filling to ensure full wetting, which significantly extends the production cycle and restricts capacity expansion. Summary of the Invention

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a single-cell battery having a first orientation, including: A housing having a receiving cavity; The electrolyte is contained in the receiving cavity; An electrode assembly is disposed in the receiving cavity, the electrode assembly having a central hole that extends through the electrode assembly along the first direction; A top cover plate, which is connected to the housing and seals the receiving cavity; A liquid storage device is disposed in the central hole, and the liquid storage device is used to absorb and store the electrolyte and to release the electrolyte when squeezed.

[0005] In some embodiments of the first aspect, the single cell further includes a support member disposed in the receiving cavity and connected to the liquid reservoir, the support member being located on the side of the electrode assembly opposite to the top cover sheet.

[0006] In some embodiments of the first aspect, the single cell further has a second direction, which is perpendicular to the first direction, the projection of the liquid storage device along the second direction is located within the projection range of the electrode assembly along the second direction, and the size of the liquid storage device along the first direction is less than or equal to the size of the electrode assembly along the first direction. The projection of the electrode assembly along the first direction is located within the projection range of the support member along the first direction.

[0007] In some embodiments of the first aspect, the support member includes a first protective layer, a stress-bearing layer, and a second protective layer, the stress-bearing layer being disposed between the first and second protective layers, and the first protective layer being connected to the liquid storage member; The support also includes a connecting portion disposed at the circumferential edge of the stress-bearing layer, wherein the first protective layer and the second protective layer are connected through the connecting portion to cover the stress-bearing layer.

[0008] In some embodiments of the first aspect, there are multiple connecting portions, and the multiple connecting portions are distributed at intervals along the circumferential direction of the stress-bearing layer; Alternatively, the connecting portion may be a single part that extends circumferentially along the stress-bearing layer.

[0009] In some embodiments of the first aspect, the support member is provided with through holes, and the through holes are provided in a plurality of spaced-apart configurations, the through holes penetrating the first protective layer, the stress-bearing layer and the second protective layer along the first direction.

[0010] In some embodiments of the first aspect, the thickness of the first protective layer along the first direction is T1, the thickness of the second protective layer along the first direction is T2, and the thickness of the stress-bearing layer along the first direction is T3, wherein T1 is less than or equal to T3, and T2 is less than or equal to T3.

[0011] In some embodiments of the first aspect, the liquid reservoir includes a body portion and an adhesive layer, the adhesive layer being affixed to at least a portion of the surface of the body portion and bonded to the wall of the central hole.

[0012] In some embodiments of the first aspect, the single cell further includes an insulating film disposed around the electrode assembly, the housing includes a bottom wall disposed opposite to the top cover sheet along the first direction, one end of the insulating film along the first direction is connected to the top cover sheet, and one end of the insulating film away from the top cover sheet is connected to a support member, and a gap exists between the support member and the bottom wall.

[0013] Secondly, embodiments of this application provide a battery pack including the single battery cells described in any of the embodiments of the first aspect above.

[0014] This application utilizes a liquid storage device disposed within the central hole of the electrode assembly. This device can absorb and store electrolyte and release it under pressure. During the electrolyte injection process, the storage capacity of the device accelerates the wetting of the electrolyte into the electrode assembly, shortening the time required for post-injection wetting. This effectively overcomes the technical problem of prolonged production cycles and limited capacity expansion caused by the long standing time required after traditional cell injection. Simultaneously, during use, the expansion of the electrode assembly compresses the storage device to release electrolyte, replenishing electrolyte for ion transport between electrodes, shortening the ion transport path, reducing internal resistance, and maintaining battery performance. Furthermore, the compressibility of the storage device provides a buffer space for electrode assembly expansion, reducing casing deformation and improving battery safety and cycle stability.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This paper shows a schematic diagram of the structure of a single cell battery under the explosive state of this application; Figure 2 The diagram shows the structure of the electrode assembly, liquid reservoir, and support component under an explosive state. Figure 3 This paper shows a cross-sectional view of the electrode assembly, liquid reservoir, and support in their assembled state. Figure 4 This application shows Figure 3 Enlarged view of point A in the middle; Figure 5 A simplified schematic diagram of the cross-sectional view of a single cell in this application is shown.

[0018] Explanation of key component symbols: 100-Housing; 110-Bottom wall; 120-Side wall; 101-Receiving cavity; 102-Gap; 200-Electrode assembly; 201-Center hole; 210-Electrode body; 220-Electrode tab; 300-Top cover plate; 400-Liquid reservoir; 410-Body part; 420-Adhesive layer; 500-Supporting part; 501-Through hole; 510-First protective layer; 520-Strength-bearing layer; 530-Second protective layer; 540-Connecting part; 600-Insulating film; 601-Encapsulation cavity; Z-First direction; X-Second direction; Y-Third direction. Detailed Implementation

[0019] The embodiments of this application 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 application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0025] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0027] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0028] This application provides a single-cell battery having two perpendicular directions: a first direction Z, a second direction X, and a third direction Y. The single-cell battery includes a housing 100, an electrolyte, an electrode assembly 200, a top cover 300, and a storage container 400. The housing 100 has a receiving cavity 101 in which the electrolyte is contained. The electrode assembly 200 is disposed in the receiving cavity 101 and has a central hole 201 that extends through the electrode assembly 200 along the first direction Z. The top cover 300 is connected to the housing 100 and seals the receiving cavity 101. The storage container 400 is disposed in the central hole 201 and is capable of absorbing and storing electrolyte and releasing electrolyte when squeezed.

[0029] In this embodiment, the first direction Z is the height direction of a single battery cell, the second direction X is the length direction of a single battery cell, and the third direction Y is the width direction.

[0030] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the electrode assembly 200 has a central hole 201 at its center along the first direction Z. The central hole 201 penetrates the electrode assembly 200 along the first direction Z. At this time, the liquid storage device 400 is located in the central hole 201. The liquid storage device 400 can absorb electrolyte from the bottom and store the electrolyte inside the liquid storage device 400 to reduce the immersion time and improve the battery production efficiency.

[0031] In this embodiment, since the liquid storage device 400 is located inside the electrode assembly 200 and is in direct contact with the electrolyte, the heat generated inside the electrode assembly 200 can be transferred to the outside through the liquid storage device 400 during the use of the electrode assembly 200, thereby improving the heat dissipation efficiency.

[0032] Furthermore, during the use of a single battery cell, the electrode assembly 200 may expand. Since the liquid storage device 400 is compressible, the electrode assembly 200 will exert a compressive force on the liquid storage device 400 to deform it, providing a buffer space for the expansion of the electrode assembly 200, thereby reducing the force exerted by the expansion of the electrode assembly 200 on the housing 100, and thus reducing the deformation of the housing 100 and improving safety.

[0033] The expansion of the electrode assembly 200 into itself will compress the electrolyte storage unit 400. When the electrolyte storage unit 400 is compressed, the electrolyte stored inside it will be released, thereby providing electrolyte for ion transport between the electrodes, shortening the transport path, reducing internal resistance during use, and maintaining battery performance.

[0034] For example, the liquid storage component 400 is a compressible and resilient liquid-absorbing material, specifically a silicone foam material, aerogel material, polymer electrolyte matrix material, or other compressible and resilient liquid-absorbing material. In practice, the material can be selected as needed, and no specific limitation is made here.

[0035] In some embodiments, the single cell also includes a support member 500, which is disposed in the receiving cavity 101 and connected to the liquid storage member 400, and is located on the side of the electrode assembly 200 away from the top cover plate 300.

[0036] Please see Figure 1 , Figure 2 as well as Figure 3 A support member 500 is fixedly installed at the bottom of the electrode assembly 200. When the bottom of the housing 100 is impacted, the support member 500 can absorb the impact force, reduce the deformation of the housing 100, and improve the safety performance of the entire single cell.

[0037] In this embodiment, the support 500 is connected to the bottom of the liquid storage component 400, specifically by heat fusion.

[0038] In some embodiments, the projection of the liquid reservoir 400 along the second direction X is located within the projection range of the electrode assembly 200 along the second direction X, and the size of the liquid reservoir 400 along the first direction Z is smaller than the size of the electrode assembly 200 along the first direction Z; the projection of the electrode assembly 200 along the first direction Z is located within the projection range of the support 500 along the first direction Z.

[0039] See Figure 2 and Figure 3 As shown, the height of the liquid reservoir 400 should be less than the height of the electrode assembly 200, so that the liquid reservoir 400 can be completely located in the electrode assembly 200. This allows the liquid reservoir 400 to be compressed when the electrode assembly 200 expands and squeezes inward, providing a buffer space for the electrode assembly 200. It can be understood that if the liquid reservoir 400 is located inside the electrode assembly 200, then in the second direction X, the liquid reservoir 400 will necessarily be less than the length of the electrode assembly 200, and the liquid reservoir 400 will also be less than the width of the electrode assembly 200.

[0040] Continue reading Figure 2 and Figure 3 The projected area of ​​the support member 500 in the first direction Z should be greater than or equal to the projected area of ​​the electrode assembly 200 in the first direction Z, so that the support member 500 can completely cover the electrode assembly 200 from the bottom, thereby reducing the damage to the electrode assembly 200 when the single cell is impacted from the bottom and improving safety.

[0041] In another embodiment, the size of the liquid storage device 400 along the first direction Z can also be equal to the size of the electrode assembly 200 along the first direction Z, that is, the height of the liquid storage device 400 is the same as the height of the electrode assembly 200, so that it can accommodate and absorb more electrolyte, and can also release more electrolyte when compressed, so as to facilitate ion transport between the electrodes and maintain battery performance.

[0042] In some embodiments, the support member 500 is a composite structure, including a first protective layer 510, a stress-bearing layer 520 and a second protective layer 530, with the stress-bearing layer 520 disposed between the first protective layer 510 and the second protective layer 530, and the first protective layer 510 connected to the liquid storage member 400.

[0043] See Figure 2 and Figure 3 As shown, the first protective layer 510 and the second protective layer 530 are both insulating materials. The stress-bearing layer 520 is located between the first protective layer 510 and the second protective layer 530, and the mechanical strength of the stress-bearing layer 520 is greater than that of the first protective layer 510 and the second protective layer 530. That is, the stress-bearing layer 520 is the main stress-bearing component to withstand the impact force.

[0044] It is understandable that the first protective layer 510 and the second protective layer 530 wrap around the stress-bearing layer 520 to prevent the stress-bearing layer 520 from breaking and its fragments from embedding into the electrode assembly 200, causing a short circuit. That is, the function of the first protective layer 510 and the second protective layer 530 is to prevent the stress-bearing layer 520 from breaking and its fragments from embedding into the electrode assembly 200. Under the action of the first protective layer 510 and the second protective layer 530, even if the stress-bearing layer 520 breaks, the fragments will not splash in the receiving cavity 101, so that the entire stress-bearing layer 520 is confined between the first protective layer 510 and the second protective layer 530.

[0045] For example, the first protective layer 510 and the second protective layer 530 are mainly made of plastic and have insulation properties. The stress-bearing layer 520 can be made of biomimetic materials, metal matrix composites, polyurethane, carbon fiber composites and other materials with certain mechanical strength, so as to resist impact through the stress-bearing layer 520. In practice, other materials can also be selected, and the specific materials are not limited here.

[0046] In some embodiments, the support member 500 further includes a connecting portion 540 disposed at the circumferential edge of the stress-bearing layer 520, and the first protective layer 510 and the second protective layer 530 are connected through the connecting portion 540 to cover the stress-bearing layer 520.

[0047] like Figure 3As shown, the first protective layer 510 and the second protective layer 530 are connected at the circumferential edge by a connecting part 540 to cover the stress layer 520. Specifically, the first protective layer 510 and the second protective layer 530 are connected by friction welding, and the connecting part 540 is the weld point connecting the first protective layer 510 and the second protective layer 530.

[0048] In some embodiments, there are multiple connecting portions 540, which are distributed circumferentially along the stress layer 520.

[0049] It is understandable that the connecting part 540 serves as a welding point, which is located on one side of the circumferential direction of the stress-bearing layer 520. There are multiple welding points, which are evenly spaced along the circumferential edge of the stress-bearing layer 520. The connection between the first protective layer 510 and the second protective layer 530 is achieved through multiple welding points. That is, the first protective layer 510 and the stress-bearing layer 520 are connected by spot welding. It should be noted that the welding point is not connected to the stress-bearing layer 520; the welding point is only located in the circumference of the stress-bearing layer 520.

[0050] In another embodiment, the connecting portion 540 is a single portion that extends circumferentially along the stress-bearing layer 520.

[0051] It is understandable that the connecting part 540 is a solder joint located on the periphery of the stress-bearing layer 520, and the solder joint extends in a ring along the circumference of the stress-bearing layer 520. At this time, the first protective layer 510 and the second protective layer 530 are connected by full welding. It is understandable that the connecting part 540 is only located on the periphery of the stress-bearing layer 520 and is not connected to the stress-bearing layer 520.

[0052] In some embodiments, the support member 500 is provided with through holes 501, and multiple through holes 501 are provided and spaced apart. The through holes 501 penetrate the first protective layer 510, the stress layer 520 and the second protective layer 530 along the first direction Z.

[0053] Continue reading Figure 2 and Figure 3 To allow the electrolyte to penetrate into the reservoir 400 from the bottom, multiple through holes 501 are formed on the support 500. These through holes 501 are evenly spaced on the support 500, specifically arranged in a rectangular array. The through holes 501 penetrate the first protective layer 510, the stress-bearing layer 520, and the second protective layer 530. The first protective layer 510 serves as an electrolyte wetting channel, enabling the electrolyte to penetrate from the bottom.

[0054] In some embodiments, the thickness of the first protective layer 510 along the first direction Z is T1, the thickness of the second protective layer 530 along the first direction Z is T2, and the thickness of the stress-bearing layer 520 along the first direction Z is T3, where T1 is less than or equal to T3, and T2 is less than or equal to T3.

[0055] See Figure 2 and Figure 3 As shown, the first protective layer 510 and the second protective layer 530 are mainly used to cover the stress-bearing layer 520 to prevent it from breaking under impact and generating fragments that pierce the shell 100. Therefore, in terms of mechanical strength, the stress-bearing layer 520 should be greater than the first protective layer 510 and the second protective layer 530. Therefore, in order to maximize the mechanical strength of the entire support 500 while keeping the volume unchanged, the thickness of the first protective layer 510 and the second protective layer 530 should be less than or equal to that of the stress-bearing layer 520. In practice, the thickness of the first protective layer 510 and the second protective layer 530 is less than the thickness of the stress-bearing layer 520.

[0056] In another embodiment, when the thickness of the first protective layer 510 and the second protective layer 530 is less than that of the stress-bearing layer 520, the thicknesses of the first protective layer 510 and the second protective layer 530 are the same, that is, T1 equals T2 and T1 is less than or equal to T3. In practice, the thicknesses of the first protective layer 510 and the second protective layer 530 are less than or equal to the thickness of the stress-bearing layer 520. Due to errors in actual manufacturing, when the thicknesses of the first protective layer 510 and the second protective layer 530 are equal, there will be a thickness error between the first protective layer 510 and the second protective layer 530.

[0057] In other embodiments, the thickness of the first protective layer 510 may be greater than the thickness of the second protective layer 530, or the thickness of the first protective layer 510 may be less than the thickness of the second protective layer 530. The specific design is not limited here and can be carried out according to the actual situation.

[0058] In some embodiments, the liquid storage component 400 includes a body portion 410 and an adhesive layer 420. The adhesive layer 420 is attached to at least a portion of the surface of the body portion 410 and is bonded to the wall of the central hole 201.

[0059] See Figure 3 and Figure 4 As shown, in order to achieve a tight connection with the electrode assembly 200, the liquid storage component 400 mainly includes a body portion 410 and an adhesive layer 420. The body portion 410 is mainly used for absorbing and storing the electrolyte, and the adhesive layer 420 is used to connect the body portion 410 to the wall of the central hole 201. That is, the body portion 410 is connected to the electrode assembly 200 through the adhesive layer 420. It can be understood that the electrode assembly 200 is manufactured by winding. The body portion 410 can be bonded to the electrode sheet of the electrode assembly 200 through the adhesive layer 420 to prevent misalignment and slippage between the electrode sheet and the body portion 410 during winding, ensuring orderly winding.

[0060] In some embodiments, the single cell further includes an insulating film 600 disposed around the electrode assembly 200. The housing 100 includes a bottom wall 110 disposed opposite to the top cover plate 300 along a first direction Z. One end of the insulating film 600 along the first direction Z is connected to the top cover plate 300, and the other end of the insulating film 600 away from the top cover plate 300 is connected to a support member 500. A gap 102 is formed between the support member 500 and the bottom wall 110.

[0061] See Figure 1 and Figure 5 As shown, the housing 100 includes a bottom wall 110 and a side wall 120 that are connected to each other. The bottom wall 110 and the side wall 120 enclose a receiving cavity 101. The top cover 300 is connected to the side wall 120 to cover the receiving cavity 101.

[0062] In this embodiment, the insulating film 600 is located within the receiving cavity 101 and is generally square-shaped. The insulating film 600 has a covering cavity 601, the electrode assembly 200 is located within the covering cavity 601, the insulating film 600 is located around the electrode assembly 200, the top of the insulating film 600 is connected to the top cover plate 300, and the bottom of the insulating film 600 is connected to the support member 500. Specifically, the bottom of the insulating film 600 is connected to the circumferential edge of the first protective layer 510. Since the electrode assembly 200 is located above the support member 500, the insulating film 600 suspends the support member 500 and the electrode assembly 200. At this time, a gap 102 is formed between the second protective layer 530 of the support member 500 and the bottom wall 110. It can be understood that the electrolyte can enter the liquid storage member 400 and the electrode assembly 200 through the through hole 501 to achieve wetting.

[0063] like Figure 1 As shown, in this embodiment, the electrode assembly 200 includes an electrode body 210 and two tabs 220, namely a positive tab and a negative tab. A positive terminal and a negative terminal are insulatedly disposed on the top cover plate 300. The positive tab is electrically connected to the positive terminal, and the negative tab is electrically connected to the negative terminal, so that the electrical energy stored in the electrode body 210 can be transmitted to the outside for use.

[0064] For example, the electrode body 210 can be made by a winding process. The electrode body 210 includes a positive electrode sheet, a separator, a negative electrode sheet, and a separator that are wound sequentially. The entire electrode body 210 is immersed in an electrolyte. During the winding process of the electrode body 210, the liquid storage component 400 is located at the center of the electrode body 210, and the width and height of the liquid storage component 400 are consistent with those of the winding needle. The positive electrode sheet, the separator, the negative electrode sheet, and the separator are wound around the liquid storage component 400 to form the electrode body 210, so that the liquid storage component 400 is located at the center of the entire electrode body 210.

[0065] This application also provides a battery pack comprising individual batteries from any of the above embodiments.

[0066] It is understood that the battery pack includes individual cells in any of the above embodiments, and therefore the battery pack has all the technical effects of the individual cells described above. The specific technical effects will not be elaborated here.

[0067] This battery pack can be used in electrical devices, such as vehicles, ships, spacecraft, and energy storage devices. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft can be airplanes, rockets, space shuttles, drones, or spacecraft. Energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, and temporary power supply devices. No specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-cell battery having a first orientation (Z), characterized in that, include: The housing (100) has a receiving cavity (101). The electrolyte is contained in the receiving cavity (101); An electrode assembly (200) is disposed in the receiving cavity (101) and has a central hole (201) that extends through the electrode assembly (200) along the first direction (Z). Top cover plate (300), the top cover plate (300) is connected to the housing (100) and covers the receiving cavity (101); A liquid storage device (400) is disposed in the central hole (201). The liquid storage device (400) is used to absorb and store the electrolyte and to release the electrolyte when squeezed.

2. The single-cell battery according to claim 1, characterized in that, The single cell also includes a support (500), which is disposed in the receiving cavity (101) and connected to the liquid storage device (400). The support (500) is located on the side of the electrode assembly (200) away from the top cover plate (300).

3. The single-cell battery according to claim 2, characterized in that, The single cell also has a second direction (X), which is perpendicular to the first direction (Z). The projection of the liquid storage device (400) along the second direction (X) is located within the projection range of the electrode assembly (200) along the second direction (X), and the size of the liquid storage device (400) along the first direction (Z) is less than or equal to the size of the electrode assembly (200) along the first direction (Z). The projection of the electrode assembly (200) along the first direction (Z) lies within the projection range of the support (500) along the first direction (Z).

4. The single-cell battery according to claim 2, characterized in that, The support member (500) includes a first protective layer (510), a stress-bearing layer (520), and a second protective layer (530). The stress-bearing layer (520) is disposed between the first protective layer (510) and the second protective layer (530). The first protective layer (510) is connected to the liquid storage member (400). The support member (500) further includes a connecting portion (540) disposed at the circumferential edge of the stress-bearing layer (520), wherein the first protective layer (510) and the second protective layer (530) are connected through the connecting portion (540) to cover the stress-bearing layer (520).

5. The single-cell battery according to claim 4, characterized in that, There are multiple connecting parts (540), and the multiple connecting parts (540) are distributed circumferentially along the force-bearing layer (520); Alternatively, the connecting portion (540) may be a single portion that extends circumferentially along the force-bearing layer (520).

6. The single-cell battery according to claim 4, characterized in that, The support member (500) is provided with through holes (501), and there are multiple through holes (501) spaced apart. The through holes (501) penetrate the first protective layer (510), the stress layer (520) and the second protective layer (530) along the first direction (Z).

7. The single-cell battery according to claim 4, characterized in that, The thickness of the first protective layer (510) along the first direction (Z) is T1, the thickness of the second protective layer (530) along the first direction (Z) is T2, and the thickness of the stress-bearing layer (520) along the first direction (Z) is T3, wherein T1 is less than or equal to T3, and T2 is less than or equal to T3.

8. The single-cell battery according to claim 1, characterized in that, The liquid storage component (400) includes a body portion (410) and an adhesive layer (420), the adhesive layer (420) being attached to at least a portion of the surface of the body portion (410), and the adhesive layer (420) being bonded to the wall of the central hole (201).

9. The single-cell battery according to claim 4, characterized in that, The single cell also includes an insulating film (600) disposed on the periphery of the electrode assembly (200). The housing (100) includes a bottom wall (110) disposed opposite to the top cover plate (300) along the first direction (Z). One end of the insulating film (600) along the first direction (Z) is connected to the top cover plate (300), and the other end of the insulating film (600) away from the top cover plate (300) is connected to a support member (500). There is a gap (102) between the support member (500) and the bottom wall (110).

10. A battery pack, characterized in that, The single-cell battery includes any one of claims 1 to 9.

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