Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment, the battery monomer comprises an electrolyte, an electrode assembly, a shell and a first adsorption part, the shell is used for accommodating the electrolyte and the electrode assembly, the shell comprises a first wall, the first wall supports the electrolyte and the electrode assembly, the first adsorption part is arranged on one side, opposite to the first wall, of the electrode assembly, and the first adsorption part is used for adsorbing the electrolyte. At least part of the electrolyte is absorbed by the first adsorption part and flows from the first adsorption part to the side, back to the first wall, of the electrode assembly. According to the battery monomer provided by the invention, the first adsorption part is arranged on the side, back to the first wall, of the electrode assembly, so that the condition that the side, back to the first wall, of the electrode assembly is lack of electrolyte is effectively improved, the first effect of the battery monomer is effectively improved, and the cycle performance of the battery monomer is also effectively improved; therefore, the working performance of the battery monomer is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] A battery usually includes battery cells. In the development process of battery technology, how to improve the working performance of battery cells is an urgent technical problem in battery technology. Summary of the Utility Model

[0004] One of the purposes of the embodiments of this application is to provide a battery cell, a battery and an electrical device, aiming to solve the technical problem of poor working performance of battery cells in related technologies.

[0005] To solve the above technical problem, the technical solution adopted in the embodiments of this application is: A battery cell is provided, including:

[0006] An electrolyte;

[0007] An electrode assembly;

[0008] A housing for containing the electrolyte and the electrode assembly, the housing includes a first wall that supports the electrolyte and the electrode assembly;

[0009] A first adsorbent member disposed on a side of the electrode assembly facing away from the first wall;

[0010] Wherein, at least part of the electrolyte is absorbed by the first adsorbent member and can flow from the first adsorbent member to a side of the electrode assembly facing away from the first wall.

[0011] The beneficial effect of the battery cell provided by the embodiments of this application is that: By disposing the first adsorbent member on a side of the electrode assembly facing away from the first wall, the first adsorbent member can absorb the free electrolyte in the battery cell, and the electrolyte absorbed by the first adsorbent member can flow from the first adsorbent member to a side of the electrode assembly facing away from the first wall under the action of its own gravity to supplement the electrolyte to the side of the electrode assembly facing away from the first wall, effectively improving the situation that the side of the electrode assembly facing away from the first wall lacks electrolyte, not only effectively improving the initial efficiency of the battery cell, but also effectively enhancing the cycle performance of the battery cell, thereby effectively improving the working performance of the battery cell.

[0012] In some embodiments of this application, the electrode assembly includes an electrode body and a tab connected to the electrode body, and the first adsorbent member is disposed on a side of the electrode body facing away from the first wall.

[0013] By adopting the above technical solution, the electrolyte absorbed by the first adsorbent can directly flow from the first adsorbent to the side of the electrode body facing away from the first wall under its own gravity, so as to supplement the electrolyte to the side of the electrode body facing away from the first wall, improve the liquid replenishment efficiency, and further enhance the working performance of the battery cell.

[0014] In some embodiments of the present application, the tab includes a first tab and a second tab with opposite polarities. The first tab and the second tab are connected to the side of the electrode body facing away from the first wall and are arranged separately from each other. The first adsorbent includes a first adsorbing body, and the first adsorbing body is arranged between the first tab and the second tab.

[0015] By adopting the above technical solution, not only the space on the side of the electrode body facing away from the first wall is fully utilized, the coverage area of the first adsorbent is increased, thereby further improving the liquid replenishment efficiency, but also the first tab and the second tab can be prevented from being inserted reversely into the electrode body by the first adsorbing body, reducing the risk of short circuit between the first tab and the second tab, and further enhancing the working performance of the battery cell.

[0016] In some embodiments of the present application, the first adsorbent further includes a second adsorbing body and a third adsorbing body. The second adsorbing body is arranged on the side of the first tab facing away from the second tab, and the third adsorbing body is arranged on the side of the second tab facing away from the first tab.

[0017] By adopting the above technical solution, the space on the side of the electrode body facing away from the first wall is more fully utilized, the coverage area of the first adsorbent is further increased, thereby further improving the liquid replenishment efficiency, and the first tab and the second tab can be more effectively prevented from being inserted reversely into the electrode body, further reducing the risk of short circuit between the first tab and the second tab, and further enhancing the working performance of the battery cell.

[0018] In some embodiments of the present application, the first adsorbent is fixedly connected to the electrode assembly.

[0019] By adopting the above technical solution, the risk of the first adsorbent detaching from the side of the electrode assembly facing away from the first wall is effectively reduced, the reliability of the first adsorbent is improved, and the working performance of the battery cell is further enhanced.

[0020] In some embodiments of the present application, the battery cell further includes a first bonding member, and the first bonding member is bonded between the first adsorbent and the electrode assembly.

[0021] By adopting the above technical solution, it is convenient to fixedly connect the first adsorbent to the electrode assembly.

[0022] In some embodiments of the present application, the first bonding member is bonded to the side of the first adsorbent.

[0023] By adopting the above technical solution, the situation that the first adhesive member blocks the electrolyte from flowing to the side of the electrode assembly facing away from the first wall is effectively improved, thereby effectively enhancing the working performance of the battery cell.

[0024] In some embodiments of the present application, the thickness of the first adsorbent is 0.5 mm - 3 mm.

[0025] By adopting the above technical solution, the thickness dimension of the first adsorbent is optimized, which not only enables the first adsorbent to have good adsorption capacity, but also reduces the space occupied by the first adsorbent, thereby improving the volume energy density of the battery cell.

[0026] In some embodiments of the present application, the first adsorbent is a porous foam member.

[0027] By adopting the above technical solution, the adsorption capacity of the first adsorbent is effectively improved.

[0028] In some embodiments of the present application, the battery cell further includes a second adsorbent connected to the first adsorbent. The second adsorbent extends from the first adsorbent towards the first wall, and at least part of the electrolyte is absorbed by the second adsorbent and can flow from the second adsorbent to the first adsorbent.

[0029] By adopting the above technical solution, the electrolyte located at the bottom of the housing can be replenished to the first adsorbent through the second adsorbent, effectively improving the situation that the first adsorbent lacks electrolyte, and realizing continuous replenishment of electrolyte to the side of the electrode assembly facing away from the first wall, thereby further enhancing the working performance of the battery cell.

[0030] In some embodiments of the present application, the number of the second adsorbents is multiple.

[0031] By adopting the above technical solution, the situation that the first adsorbent lacks electrolyte is further improved, and continuous replenishment of electrolyte to the side of the electrode assembly facing away from the first wall is more effectively realized, thereby further enhancing the working performance of the battery cell.

[0032] In some embodiments of the present application, the electrode assembly has two first sides arranged opposite to each other and two second sides arranged opposite to each other. The second sides are connected between the two first sides. The area of the first side is larger than the area of the second side, and at least two second adsorbents are provided on the first side.

[0033] By adopting the above technical solution, the situation that the first adsorbent lacks electrolyte is further improved, and continuous replenishment of electrolyte to the side of the electrode assembly facing away from the first wall is more effectively realized, thereby further enhancing the working performance of the battery cell.

[0034] In some embodiments of the present application, the second adsorbent is fixedly connected to the electrode assembly.

[0035] By adopting the above technical solution, the risk of displacement of the second adsorbing member is effectively reduced, the reliability of the second adsorbing member is improved, and thus the working performance of the battery cell is further enhanced.

[0036] In some embodiments of the present application, the battery cell further includes a second bonding member, and the second bonding member is bonded between the second adsorbing member and the electrode assembly.

[0037] By adopting the above technical solution, it is convenient to fixedly connect the second adsorbing member and the electrode assembly.

[0038] In some embodiments of the present application, the second bonding member is bonded to the side of the second adsorbing member.

[0039] By adopting the above technical solution, the situation where the second bonding member blocks the electrolyte from flowing to the electrode assembly is effectively improved, and thus the working performance of the battery cell is effectively enhanced.

[0040] In some embodiments of the present application, the thickness of the second adsorbing member is 0.5 mm - 3 mm.

[0041] By adopting the above technical solution, the thickness dimension of the second adsorbing member is optimized. Not only does the second adsorbing member have good adsorption ability, but also the space occupied by the second adsorbing member can be reduced, and the volumetric energy density of the battery cell is improved.

[0042] In some embodiments of the present application, the second adsorbing member is a porous foam member.

[0043] By adopting the above technical solution, the adsorption ability of the second adsorbing member is effectively improved.

[0044] The embodiment of the present application also provides a battery, including the battery cell described in any one of the above embodiments.

[0045] The beneficial effect of the battery provided by the embodiment of the present application is that: since the battery provided by the embodiment of the present application adopts the battery cell described in any one of the above embodiments, the working performance of the battery is effectively enhanced.

[0046] The embodiment of the present application also provides an electrical device, including the above battery.

[0047] The beneficial effect of the electrical device provided by the embodiment of the present application is that: since the electrical device provided by the embodiment of the present application adopts the above battery, the working performance of the electrical device is effectively enhanced. Description of the Drawings

[0048] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 Structural schematic diagram of the vehicle provided by the embodiment of the present application;

[0050] Figure 2 Explosion structural schematic diagram of the battery provided by the embodiment of the present application;

[0051] Figure 3 Structural schematic diagram of the battery cell provided by the embodiment of the present application;

[0052] Figure 4 For Figure 3 Explosion structural schematic diagram of the battery cell shown;

[0053] Figure 5 For Figure 3 Front view structural schematic diagram of the battery cell shown;

[0054] Figure 6 For Figure 5 Cross-sectional structural schematic diagram of the battery cell shown along the A-A line direction;

[0055] Figure 7 For Figure 6 Enlarged structural schematic diagram of the B position of the battery cell shown.

[0056] Explanation of reference numerals:

[0057] 1000, vehicle;

[0058] 100, battery; 10, box body; 11, first part; 12, second part; 20, battery cell; 21, outer shell; 211, first wall; 212, housing; 2121, cavity; 2122, second wall; 213, cover body; 22, electrode assembly; 221, electrode main body; 2211, first side; 2212, second side; 2213, first end face; 2214, second end face; 222, tab; 2221, first tab; 2222, second tab; 23, first adsorbent; 231, first adsorbent body; 232, second adsorbent body; 233, third adsorbent body; 24, second adsorbent; 25, first adhesive; 26, second adhesive; 27, electrode terminal;

[0059] 200, controller;

[0060] 300, motor. Detailed implementation manners

[0061] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0062] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. Terms "first" and "second" are only used for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0063] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of simplicity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width and other dimensions of various components shown in the accompanying drawings in the embodiments of the present application are only illustrative descriptions and should not constitute any limitation to the present application.

[0064] As the smallest unit constituting a battery, a battery cell generally includes a housing, an electrode assembly and an electrolyte, and the electrode assembly and the electrolyte are accommodated in the housing. The electrode assembly is the component in the battery cell where an electrochemical reaction occurs. The main part of the electrode assembly is made of a positive electrode sheet, a negative electrode sheet and a separator by a winding process or a stacking process. The electrolyte plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet, so that the battery cell generates electric energy or inputs electric energy into the battery cell.

[0065] In the related art, the internal space of the housing is usually not filled with electrolyte, so that the top of the main body of the electrode assembly cannot be immersed in the electrolyte. After a long-term static state, the top of the main body of the electrode assembly will lack electrolyte. Especially for a sodium-ion battery cell, since the negative electrode sheet in the electrode assembly of the sodium-ion battery cell does not need to be coated with an active material, the negative electrode sheet hardly has the ability to lock the electrolyte. Therefore, the electrode assembly of the sodium-ion battery cell is more likely to lack electrolyte. When the electrode assembly lacks electrolyte, the first efficiency and the cycle performance of the battery cell will both decrease, which is not conducive to improving the working performance of the battery cell.

[0066] In order to improve the situation that the electrode assembly lacks electrolyte and enhance the working performance of the battery cell, the battery cell provided by the embodiment of the present application arranges the first adsorbent on the side of the electrode assembly facing away from the first wall. The first adsorbent can absorb the free electrolyte in the battery cell, and the electrolyte absorbed by the first adsorbent can flow from the first adsorbent to the side of the electrode assembly facing away from the first wall under its own gravity, so as to supplement the electrolyte to the side of the electrode assembly facing away from the first wall, effectively improving the situation that the side of the electrode assembly facing the first wall lacks electrolyte. This not only effectively improves the first efficiency of the battery cell, but also effectively enhances the cycle performance of the battery cell, thereby effectively enhancing the working performance of the battery cell.

[0067] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using the batteries. Among them, the electrical equipment can be, but is not limited to, vehicles, mobile phones, portable devices, laptop computers, ships, spacecrafts, electric toys, and electric tools, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. The spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc. The electric toy includes fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. The electric tool includes metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc.

[0068] For the convenience of description, the following embodiments take a vehicle as an example of an electrical equipment in an embodiment of the present application for illustration.

[0069] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of vehicle 1000 provided by the embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is disposed inside vehicle 1000. The battery 100 can be disposed at the bottom, head or tail of vehicle 1000. The battery 100 can be used to supply power to vehicle 1000. For example, the battery 100 can be used as the operating power source of vehicle 1000. Vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of vehicle 1000.

[0070] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of vehicle 1000, but also as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0071] Please refer to Figure 2 , Figure 2 Explosion schematic diagram of the battery 100 provided by the embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide a accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12. The first part 11 and the second part 12 are covered with each other, and the first part 11 and the second part 12 jointly define a accommodation space for accommodating the battery cells 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 is covered on the opening side of the second part 12, so that the first part 11 and the second part 12 jointly define a accommodation space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the opening side of the first part 11 is covered on the opening side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0072] In some embodiments, the box body 10 can be used as a part of the chassis structure of vehicle 1000. For example, a part of the box body 10 can become at least a part of the floor of vehicle 1000, or a part of the box body 10 can become at least a part of the cross beam and longitudinal beam of vehicle 1000.

[0073] In the battery 100, there may be multiple battery cells 20. The multiple battery cells 20 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that among the multiple battery cells 20, there are both series and parallel connections. The multiple battery cells 20 can be directly connected in series, parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 can also be such that multiple battery cells 20 are first connected in series, parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box 10. The battery 100 can also include other functional components. For example, the battery 100 can also include a busbar for realizing the electrical connection between the multiple battery cells 20.

[0074] Among them, each battery cell 20 can be a secondary battery cell or a primary battery cell. A secondary battery cell refers to a battery cell 20 that can activate the active material through charging after discharging, and a primary battery cell refers to a battery cell 20 that cannot activate the active material through charging after the electrical energy is exhausted; the battery cell 20 can also be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but is not limited thereto. The battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 20 of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell. The multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc. There is no special limitation in this application.

[0075] Of course, in some embodiments, the battery 100 may not include the box 10, but instead electrically connect the multiple battery cells 20 and form a whole through necessary fixing structures and then assemble it into an electrical device.

[0076] To illustrate the technical solutions provided in this application, the following will be described in detail with reference to specific drawings and embodiments.

[0077] In a first aspect, please refer to Figures 3 to 6 , an embodiment of the present application provides a battery cell 20, including a housing 21, an electrolyte, an electrode assembly 22, and a first adsorbent 23. The housing 21 is used to accommodate the electrolyte and the electrode assembly 22. The housing 21 includes a first wall 211, and the first wall 211 supports the electrolyte and the electrode assembly 22. The first adsorbent 23 is disposed on a side of the electrode assembly 22 facing away from the first wall 211. At least part of the electrolyte is absorbed by the first adsorbent 23 and can flow from the first adsorbent 23 to a side of the electrode assembly 22 facing away from the first wall 211.

[0078] The housing 21 is a component for providing an internal environment of the battery cell 20, and this internal environment can be used to accommodate functional components such as the electrode assembly 22, the electrolyte, and the first adsorbent 23.

[0079] In some embodiments, the housing 21 may include a housing body 212 and a cover body 213. Among them, the housing body 212 has a cavity 2121, an opening can be provided on the housing body 212, and the cavity 2121 communicates with the external environment of the battery cell 20 through the opening. By covering the cover body 213 on the opening, the cavity 2121 of the housing body 212 is isolated from the external environment of the battery cell 20, thereby forming the internal environment of the battery cell 20. Specifically, the housing body 212 and the cover body 213 can form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the interior of the housing body 212, the cover body 213 is then covered on the opening of the housing body 212. The shape of the housing body 212 can be determined according to the specific shape and size of the electrode assembly 22. The shape of the housing body 212 can be, but is not limited to, a cuboid shape, a cylindrical shape, a hexagonal prism shape, etc. The shape of the cover body 213 can be adapted to the shape of the opening of the housing body 212. The shape of the cover body 213 can be, but is not limited to, a cuboid shape, a cylindrical shape, a hexagonal prism shape, etc.

[0080] The first wall 211 is the bottom wall of the housing 21. The first wall 211 is used to provide a supporting force for the electrode assembly 22 and the electrolyte, that is, when the battery cell 20 is in a working state, along the gravity direction of the battery cell 20, the first wall 211 is located below the electrode assembly 22 and the electrolyte.

[0081] In some embodiments, the first wall 211 is the bottom wall of the housing body 212. The housing body 212 further includes a second wall 2122. The second wall 2122 is disposed around the first wall 211 and connected to the periphery of the first wall 211. The second wall 2122 and the first wall 211 jointly define the above-mentioned cavity 2121. The side of the second wall 2122 away from the first wall 211 defines the above-mentioned opening. The cover body 213 is covered on the above-mentioned opening to isolate the cavity 2121 of the housing body 212 from the external environment of the battery cell 20, that is, the first wall 211 and the cover body 213 are disposed opposite to each other.

[0082] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The battery cell 20 may include one or more electrode assemblies 22. The electrode assembly 22 may include an electrode body 221, and the electrode body 221 is made of a positive electrode plate, a negative electrode plate, and a separator by a winding process or a stacking process. A plurality of positive electrode plates and negative electrode plates can be respectively provided. The plurality of positive electrode plates and the plurality of negative electrode plates are alternately stacked, and the separator is disposed between adjacent positive electrode plates and negative electrode plates to insulate and separate the positive electrode plates and the negative electrode plates. The shape of the electrode body 221 can be, but is not limited to, a cylindrical shape, a flat shape, a multi-prismatic shape, etc.

[0083] As an example, multiple positive electrode sheets may be provided. The negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0084] As an example, multiple negative electrode sheets may be provided. The positive electrode sheet is folded to form multiple stacked folding segments, and a negative electrode sheet is clamped between adjacent folding segments.

[0085] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments, and the multiple folding segments of the positive electrode sheet and the multiple folding segments of the negative electrode sheet are alternately stacked.

[0086] As an example, multiple separators may be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0087] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0088] In some embodiments, the electrode assembly 22 may further include electrode tabs 222. The electrode tabs 222 include a first electrode tab 2221 and a second electrode tab 2222. The polarity of the first electrode tab 2221 is opposite to that of the second electrode tab 2222, that is, one of the first electrode tab 2221 and the second electrode tab 2222 is a positive electrode tab 222, and the other of the first electrode tab 2221 and the second electrode tab 2222 is a negative electrode tab 222. The positive electrode tab 222 is connected to the positive electrode sheet, and the negative electrode tab 222 is connected to the negative electrode sheet to conduct the current of the electrode assembly 22 or input the current into the electrode assembly 22.

[0089] As an example, the first electrode tab 2221 and the second electrode tab 2222 may be connected to the same side of the electrode body 221. For example, the first electrode tab 2221 and the second electrode tab 2222 are connected to the side of the electrode body 221 facing away from the first wall 211.

[0090] As an example, the first electrode tab 2221 and the second electrode tab 2222 may be connected to different sides of the electrode body 221. For example, the first electrode tab 2221 and the second electrode tab 2222 are respectively connected to opposite sides of the electrode body 221 along a direction perpendicular to the thickness direction of the first wall 211.

[0091] In some embodiments, the battery cell 20 may further include an electrode terminal 27, which is a component electrically connected to the electrode assembly 22 for outputting the electric energy of the battery cell 20 or inputting electric energy into the battery cell 20. The electrode terminal 27 is disposed on the housing 21. As an example, the electrode terminal 27 is disposed on the cover 213. A portion of the electrode terminal 27 extends into the internal environment of the housing 21 and is directly or indirectly connected to the pole ear 222 of the electrode assembly 22, and another portion of the electrode terminal 27 is exposed to the external environment of the housing 21 and is connected to components such as a busbar and a sampling device. The number of electrode terminals 27 may be two, one electrode terminal 27 is electrically connected to the first pole ear 2221, and the other electrode terminal 27 is electrically connected to the second pole ear 2222. Of course, in other embodiments, the number of electrode terminals 27 may also be one, the electrode terminal 27 is electrically connected to the first pole ear 2221, and the second pole ear 2222 is electrically connected to the housing 21.

[0092] The electrolyte is a component that conducts ions between the positive electrode sheet and the negative electrode sheet. It can be understood that at least part of the electrode body 221 is immersed in the electrolyte.

[0093] The first adsorbent 23 is a component for absorbing electrolyte. It should be noted that the electrolyte absorbed by the first adsorbent 23 will not be stored in the first adsorbent 23 forever, but will gradually flow to the side of the electrode assembly 22 facing away from the first wall 211 under the action of its own gravity. The first adsorbent 23 can be separated from the electrode assembly 22, and the first adsorbent 23 can also be attached to the electrode assembly 22. The material of the first adsorbent 23 can be but not limited to foam, sponge, absorbent fabric, absorbent paper, etc.

[0094] In some embodiments, the first adsorbent 23 has a plurality of capillaries, and the electrolyte absorbed by the first adsorbent 23 will temporarily remain in the capillaries of the first adsorbent 23. Under the action of its own gravity, the electrolyte absorbed by the first adsorbent 23 will gradually separate from the capillaries of the first adsorbent 23 and flow to the side of the electrode assembly 22 facing away from the first wall 211.

[0095] The battery cell 20 provided in the embodiment of the present application is configured such that the first adsorbent 23 is disposed on the side of the electrode assembly 22 facing away from the first wall 211. The first adsorbent 23 can absorb free electrolyte in the battery cell 20. The electrolyte absorbed by the first adsorbent 23 can flow from the first adsorbent 23 to the side of the electrode assembly 22 facing away from the first wall 211 under the action of its own gravity, so as to replenish the electrolyte to the side of the electrode assembly 22 facing away from the first wall 211, thereby effectively improving the situation where the electrolyte is lacking on the side of the electrode assembly 22 facing away from the first wall 211. This not only effectively improves the first efficiency of the battery cell 20, but also effectively improves the cycle performance of the battery cell 20, thereby effectively improving the working performance of the battery cell 20.

[0096] In addition, during the storage of the battery cell 20, the electrolyte supported by the first wall 211 is in a static state, while the electrolyte absorbed by the first adsorbent 23 flows under its own gravity to the side of the electrode assembly 22 facing away from the first wall 211 to supplement the electrolyte on the side of the electrode assembly 22 facing away from the first wall 211, thereby effectively increasing the storage duration of the battery cell 20.

[0097] In some embodiments of the present application, please refer to Figure 6 , the first adsorbent 23 is disposed on the side of the electrode body 221 facing away from the first wall 211.

[0098] In some embodiments, the first adsorbent 23 has a sheet-like structure, and the first adsorbent 23 adheres to the side of the electrode body 221 facing away from the first wall 211 and covers at least a part of the side of the electrode body 221 facing away from the first wall 211.

[0099] Of course, in other embodiments, the first adsorbent 23 may also have other structures, such as a strip-like structure, etc.

[0100] By adopting the above technical solution, the electrolyte absorbed by the first adsorbent 23 can directly flow from the first adsorbent 23 to the side of the electrode body 221 facing away from the first wall 211 under its own gravity to supplement the electrolyte on the side of the electrode body 221 facing away from the first wall 211, improving the liquid supplement efficiency, and thus further enhancing the working performance of the battery cell 20.

[0101] In some embodiments of the present application, please refer to Figure 4 , the first tab 2221 and the second tab 2222 are connected to the side of the electrode body 221 facing away from the first wall 211 and are spaced apart from each other, and the first adsorbent 23 includes a first adsorbing body 231, and the first adsorbing body 231 is disposed between the first tab 2221 and the second tab 2222.

[0102] The first adsorbing body 231 is a part of the first adsorbent 23, and the first adsorbing body 231 is used for absorbing the electrolyte, and the electrolyte absorbed by the first adsorbing body 231 can flow from the first adsorbing body 231 to the portion of the electrode body 221 located between the first tab 2221 and the second tab 2222 under its own gravity.

[0103] In some embodiments, the first adsorbent 231 has a sheet-like structure. The first adsorbent 231 is attached to the side of the electrode body 221 facing away from the first wall 211, and the first adsorbent 231 covers at least a part of the portion of the electrode body 221 located between the first tab 2221 and the second tab 2222. As an example, the first adsorbent 231 covers the entire portion of the electrode body 221 located between the first tab 2221 and the second tab 2222, that is, the projection of the portion of the electrode body 221 located between the first tab 2221 and the second tab 2222 in the thickness direction of the first wall 211 is within the projection range of the first adsorbent 231 in the thickness direction of the first wall 211.

[0104] By adopting the above technical solution, not only the space on the side of the electrode body 221 facing away from the first wall 211 is fully utilized, the covering area of the first adsorbent member 23 is increased, thereby further improving the liquid replenishment efficiency, but also the first tab 2221 and the second tab 2222 can be blocked by the first adsorbent 231 from being inserted backwards into the electrode body 221, reducing the risk of short circuit between the first tab 2221 and the second tab 2222, and thus further improving the working performance of the battery cell 20.

[0105] In some embodiments of the present application, please refer to Figure 4 , the first adsorbent member 23 further includes a second adsorbent 232 and a third adsorbent 233. The second adsorbent 232 is disposed on the side of the first tab 2221 facing away from the second tab 2222, and the third adsorbent 233 is disposed on the side of the second tab 2222 facing away from the first tab 2221.

[0106] The second adsorbent 232 and the third adsorbent 233 are the other two parts of the first adsorbent member 23. Both the second adsorbent 232 and the third adsorbent 233 are used to absorb the electrolyte. The electrolyte absorbed by the second adsorbent 232 can flow from the second adsorbent 232 to the portion of the electrode body 221 on the side of the first tab 2221 facing away from the second tab 2222 under the action of its own gravity, and the electrolyte absorbed by the third adsorbent 233 can flow from the third adsorbent 233 to the portion of the electrode body 221 on the side of the first tab 2221 facing away from the second tab 2222 under the action of its own gravity. The first adsorbent 231, the second adsorbent 232 and the third adsorbent 233 can be connected to form a whole, or can be separately disposed on the side of the electrode body 221 facing away from the first wall 211.

[0107] In some embodiments, the second adsorbent 232 has a sheet-like structure. The second adsorbent 232 is attached to the side of the electrode body 221 facing away from the first wall 211, and the second adsorbent 232 covers at least a part of the portion of the electrode body 221 on the side facing away from the second tab 2222 of the first tab 2221. As an example, the second adsorbent 232 covers the entire portion of the electrode body 221 on the side facing away from the second tab 2222 of the first tab 2221, that is, the projection of the portion of the electrode body 221 on the side facing away from the second tab 2222 of the first tab 2221 in the thickness direction of the first wall 211 is within the projection range of the second adsorbent 232 in the thickness direction of the first wall 211.

[0108] In some embodiments, the third adsorbent 233 has a sheet-like structure. The third adsorbent 233 is attached to the side of the electrode body 221 facing away from the first wall 211, and the third adsorbent 233 covers at least a part of the portion of the electrode body 221 on the side facing away from the first tab 2221 of the second tab 2222. As an example, the third adsorbent 233 covers the entire portion of the electrode body 221 on the side facing away from the first tab 2221 of the second tab 2222, that is, the projection of the portion of the electrode body 221 on the side facing away from the first tab 2221 of the second tab 2222 in the thickness direction of the first wall 211 is within the projection range of the third adsorbent 233 in the thickness direction of the first wall 211.

[0109] By adopting the above technical solutions, the space on the side of the electrode body 221 facing away from the first wall 211 is utilized more fully, the covering area of the first adsorbent member 23 is further increased, thereby further improving the liquid replenishment efficiency, and the first tab 2221 and the second tab 2222 can be more effectively prevented from being inserted reversely into the electrode body 221, further reducing the risk of short circuit between the first tab 2221 and the second tab 2222, and thus further improving the working performance of the battery cell 20.

[0110] In some embodiments of the present application, the first adsorbent member 23 is fixedly connected to the electrode assembly 22.

[0111] The first adsorbent member 23 being fixedly connected to the electrode assembly 22 means that after connecting the first adsorbent member 23 and the electrode assembly 22, the position of the first adsorbent member 23 is relatively fixed with respect to the position of the electrode assembly 22. Of course, considering the connection strength, there may also be a small displacement margin between the first adsorbent member 23 and the electrode assembly 22. The manner of fixedly connecting the first adsorbent member 23 and the electrode assembly 22 may be, but is not limited to, bonding, plugging, clamping connection, etc.

[0112] In some embodiments, the electrode assembly 22 includes an electrode body 221, and the first adsorbent member 23 is fixedly connected to the electrode body 221.

[0113] By adopting the above technical solution, the risk that the first adsorbing member 23 detaches from the side of the electrode assembly 22 facing away from the first wall 211 is effectively reduced, the reliability of the first adsorbing member 23 is improved, and thus the working performance of the battery cell 20 is further enhanced.

[0114] In some embodiments of the present application, please refer to Figure 7 , the battery cell 20 further includes a first bonding member 25, and the first bonding member 25 is bonded between the first adsorbing member 23 and the electrode assembly 22.

[0115] The first bonding member 25 is a component for bonding the first adsorbing member 23 and the electrode assembly 22. The first bonding member 25 can be a double-sided tape or an adhesive coated on the first adsorbing member 23 and / or the electrode assembly 22. The first bonding member 25 can be first attached to the first adsorbing member 23 and then bonded to the electrode assembly 22 to connect the first adsorbing member 23 and the electrode assembly 22. Alternatively, the first bonding member 25 can be first attached to the electrode assembly 22 and then bonded to the first adsorbing member 23 to connect the first adsorbing member 23 and the electrode assembly 22. It is also possible to first attach the first bonding member 25 to both the first adsorbing member 23 and the electrode assembly 22, and then bond the first bonding member 25 on the first adsorbing member 23 to the first adsorbing member 23 of the electrode assembly 22 to connect the first adsorbing member 23 and the electrode assembly 22.

[0116] In some embodiments, the electrode assembly 22 includes an electrode main body 221, and the first bonding member 25 is bonded between the first adsorbing member 23 and the electrode main body 221.

[0117] By adopting the above technical solution, it is convenient to fixedly connect the first adsorbing member 23 and the electrode assembly 22.

[0118] In some embodiments of the present application, the first bonding member 25 is bonded to the side of the first adsorbing member 23.

[0119] In some embodiments, the first bonding member 25 has an annular structure, and the first bonding member 25 is bonded to the side of the first adsorbing member 23 and disposed around the middle of the first adsorbing member 23.

[0120] As an example, the first adsorbing member 23 includes a first adsorbent 231, a second adsorbent 232, and a third adsorbent 233. The number of the first bonding members 25 is multiple. One first bonding member 25 is bonded to the side of the first adsorbent 231 and disposed around the middle of the first adsorbent 231, another first bonding member 25 is bonded to the side of the second adsorbent 232 and disposed around the middle of the second adsorbent 232, and yet another first bonding member 25 is bonded to the side of the third adsorbent 233 and disposed around the middle of the third adsorbent 233.

[0121] In some other embodiments, the first adhesive member 25 has a strip-like structure, and the first adhesive member 25 is disposed along the length direction of the side of the first adsorbent member 23 and adhered to the side of the first adsorbent member 23.

[0122] As an example, the number of the first adhesive members 25 is plural, and the plural first adhesive members 25 are disposed in one-to-one correspondence with the plural sides of the first adsorbent member 23.

[0123] As an example, the first adsorbent member 23 includes a first adsorbent body 231, a second adsorbent body 232, and a third adsorbent body 233. The number of the first adhesive members 25 is plural, at least a part of the first adhesive members 25 is adhered to the side of the first adsorbent body 231, at least another part of the first adhesive members 25 is adhered to the side of the second adsorbent body 232, and at least a further part of the first adhesive members 25 is adhered to the side of the third adsorbent body 233.

[0124] By adopting the above technical solution, the situation that the first adhesive member 25 blocks the electrolyte from flowing to the electrode assembly 22 is effectively improved, thereby effectively enhancing the working performance of the battery cell 20.

[0125] In some embodiments of the present application, please refer to Figure 7 , the thickness H1 of the first adsorbent member 23 is 0.5 mm - 3 mm.

[0126] The thickness H1 of the first adsorbent member 23 refers to the dimension of the first adsorbent member 23 along the thickness direction of the first wall 211. The thickness H1 of the first adsorbent member 23 can be selected and set within the above range according to actual application requirements, and specifically can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0127] By adopting the above technical solution, the thickness dimension of the first adsorbent member 23 is optimized, which not only enables the first adsorbent member 23 to have good adsorption ability, but also can reduce the space occupied by the first adsorbent member 23 and improve the volume energy density of the battery cell 20.

[0128] In some embodiments of the present application, the first adsorbent member 23 is a porous foam member.

[0129] In other words, the first adsorbent member 23 is made of porous foam, and the porous foam can be formed by closed-cell foaming of a mixture of polyurethane and acrylic.

[0130] By adopting the above technical solution, the adsorption ability of the first adsorbent member 23 is effectively improved.

[0131] In some embodiments of the present application, please refer to together Figures 4 to 6, the battery cell 20 further includes a second absorbent member 24 connected to the first absorbent member 23. The second absorbent member 24 extends from the first absorbent member 23 toward the first wall 211, and at least part of the electrolyte is absorbed by the second absorbent member 24 and can flow from the second absorbent member 24 to the first absorbent member 23.

[0132] The second absorbent member 24 is a component for absorbing the electrolyte located at the bottom of the housing 21. It should be noted that the electrolyte absorbed by the second absorbent member 24 will not be stored in the second absorbent member 24 forever, but will flow from the second absorbent member 24 to the first absorbent member 23 when the first absorbent member 23 lacks electrolyte. The material of the second absorbent member 24 can be, but is not limited to, foam, sponge, liquid-absorbing fabric, liquid-absorbing paper, etc. The second absorbent member 24 and the first absorbent member 23 can be integrally formed components, or the second absorbent member 24 and the first absorbent member 23 can also be formed separately and then connected into a whole.

[0133] The second absorbent member 24 extending from the first absorbent member 23 toward the first wall 211 means that one end of the second absorbent member 24 is connected to the first absorbent member 23, and the other end of the second absorbent member 24 extends toward the direction close to the first wall 211. The end of the second absorbent member 24 far from the first absorbent member 23 can abut against the first wall 211 or be separated from the first wall 211.

[0134] In some embodiments, there is a gap between the electrode assembly 22 and the second wall 2122 described above. The second absorbent member 24 is disposed in this gap. The second absorbent member 24 can be separated from the electrode assembly 22, or the second absorbent member 24 can be attached to the electrode assembly 22.

[0135] In some embodiments, the second absorbent member 24 has a number of capillary pores. The electrolyte absorbed by the second absorbent member 24 will be temporarily stored in the capillary pores of the second absorbent member 24. When the first absorbent member 23 lacks electrolyte, under capillary action, the electrolyte absorbed by the second absorbent member 24 will gradually flow along the second absorbent member 24 to the first absorbent member 23.

[0136] By adopting the above technical solution, the electrolyte located at the bottom of the housing 21 can be supplemented to the first absorbent member 23 through the second absorbent member 24, effectively improving the situation that the first absorbent member 23 lacks electrolyte, and realizing continuous supplementation of electrolyte to the side of the electrode assembly 22 facing away from the first wall 211, thereby further improving the working performance of the battery cell 20.

[0137] In some embodiments of the present application, please refer to Figure 4 , the number of the second absorbent members 24 is multiple.

[0138] The number of the second adsorbing member 24 can be determined according to actual needs, specifically, it can be two, three, four, five, six, etc.

[0139] In some embodiments, the first adsorbing member 23 includes a first adsorbent 231, a second adsorbent 232, and a third attachment member. The first adsorbent 231 is connected to at least one second adsorbing member 24, the second adsorbent 232 is connected to at least another second adsorbing member 24, and the third attachment member is connected to at least one more second adsorbing member 24.

[0140] By adopting the above technical solution, the situation that the first adsorbing member 23 lacks electrolyte is further improved, and the electrolyte can be more effectively replenished continuously to the side of the electrode assembly 22 facing away from the first wall 211, thereby further improving the working performance of the battery cell 20.

[0141] In some embodiments of the present application, please refer to Figures 4 to 6 together. The electrode assembly 22 has two first side surfaces 2211 arranged opposite to each other and two second side surfaces 2212 arranged opposite to each other. The second side surfaces 2212 are connected between the two first side surfaces 2211. The area of the first side surface 2211 is larger than the area of the second side surface 2212. At least two second adsorbing members 24 are provided on the first side surface 2211.

[0142] In some embodiments, the electrode assembly 22 includes an electrode body 221 and a tab 222. The electrode body 221 has a flat structure. The two first side surfaces 2211 and the two second side surfaces 2212 constitute the outer peripheral surface of the electrode body 221. Among them, the first side surface 2211 is the large surface of the electrode body 221. The electrode body 221 also has a first end surface 2213 and a second end surface 2214. The first end surface 2213 is the surface of the electrode body 221 facing away from the first wall 211, and the second end surface 2214 is the surface of the electrode body 221 facing the first wall 211. The first adsorbing member 23 is disposed on the first end surface 2213. The tab 222 includes a first tab 2221 and a second tab 2222. The first tab 2221 and the second tab 2222 can both be disposed on the first end surface 2213. At least two second adsorbing members 24 are provided on the first side surface 2211, and the second adsorbing member 24 can be provided or not provided on the second side surface 2212.

[0143] As an example, the first adsorbent member 23 includes a first adsorbing body 231, a second adsorbing body 232, and a third adsorbing body 233. The first adsorbing body 231 is disposed between the first tab 2221 and the second tab 2222. The second adsorbing body 232 is disposed on a side of the first tab 2221 facing away from the second tab 2222. The third adsorbing body 233 is disposed on a side of the second tab 2222 facing away from the first tab 2221. One side of the first adsorbing body 231 close to one first side surface 2211 is connected to one second adsorbent member 24, and one side of the first adsorbing body 231 close to the other first side surface 2211 is connected to the other second adsorbent member 24. One side of the second adsorbing body 232 close to one first side surface 2211 is connected to one second adsorbent member 24, and one side of the second adsorbing body 232 close to the other first side surface 2211 is connected to the other second adsorbent member 24. One side of the third adsorbing body 233 close to one first side surface 2211 is connected to one second adsorbent member 24, and one side of the third adsorbing body 233 close to the other first side surface 2211 is connected to the other second adsorbent member 24.

[0144] By adopting the above technical solution, the situation that the first adsorbent member 23 lacks electrolyte is further improved, and the electrolyte can be more effectively continuously supplemented to the side of the electrode assembly 22 facing away from the first wall 211, thereby further improving the working performance of the battery cell 20.

[0145] In some embodiments of the present application, the second adsorbent member 24 is fixedly connected to the electrode assembly 22.

[0146] The second adsorbent member 24 being fixedly connected to the electrode assembly 22 means that after the second adsorbent member 24 and the electrode assembly 22 are connected, the position of the second adsorbent member 24 is relatively fixed with respect to the position of the electrode assembly 22. Of course, considering the connection strength, there may also be a small displacement margin between the second adsorbent member 24 and the electrode assembly 22. The manner in which the second adsorbent member 24 is fixedly connected to the electrode assembly 22 may be, but is not limited to, bonding, plugging, clamping connection, etc.

[0147] In some embodiments, the electrode assembly 22 includes an electrode main body 221, and the second adsorbent member 24 is fixedly connected to the electrode main body 221.

[0148] By adopting the above technical solution, the risk of the second adsorbent member 24 shifting is effectively reduced, the reliability of the second adsorbent member 24 is improved, and thus the working performance of the battery cell 20 is further improved.

[0149] In some embodiments of the present application, please refer to Figure 7 , the battery cell 20 further includes a second bonding member 26, and the second bonding member 26 is bonded between the second adsorbent member 24 and the electrode assembly 22.

[0150] The second adhesive member 26 is a component for bonding the second adsorbing member 24 and the electrode assembly 22. The second adhesive member 26 can be a double-sided tape or an adhesive coated on the second adsorbing member 24 and / or the electrode assembly 22. The second adhesive member 26 can be first attached to the second adsorbing member 24 and then bonded to the electrode assembly 22 to connect the second adsorbing member 24 and the electrode assembly 22. Alternatively, the second adhesive member 26 can be first attached to the electrode assembly 22 and then bonded to the second adsorbing member 24 to connect the second adsorbing member 24 and the electrode assembly 22. Or the second adhesive member 26 can be attached to both the second adsorbing member 24 and the electrode assembly 22, and then the second adhesive member 26 on the second adsorbing member 24 is bonded to the second adsorbing member 24 of the electrode assembly 22 to connect the second adsorbing member 24 and the electrode assembly 22.

[0151] In some embodiments, the electrode assembly 22 includes an electrode body 221, and the second adhesive member 26 is bonded between the second adsorbing member 24 and the electrode body 221.

[0152] By adopting the above technical solution, it is convenient to fixedly connect the second adsorbing member 24 and the electrode assembly 22.

[0153] In some embodiments of the present application, the second adhesive member 26 is bonded to the side of the second adsorbing member 24.

[0154] In some embodiments, the second adhesive member 26 has an annular structure, and the second adhesive member 26 is bonded to the side of the second adsorbing member 24 and is disposed around the middle of the second adsorbing member 24.

[0155] In other embodiments, the second adhesive member 26 has a strip structure, and the second adhesive member 26 is disposed along the length direction of the side of the second adsorbing member 24 and is bonded to the side of the second adsorbing member 24.

[0156] As an example, the number of the second adhesive members 26 is multiple, and the multiple second adhesive members 26 are arranged in one-to-one correspondence with the multiple sides of the second adsorbing member 24.

[0157] By adopting the above technical solution, the situation that the second adhesive member 26 blocks the electrolyte from flowing to the electrode assembly 22 is effectively improved, thereby effectively improving the working performance of the battery cell 20.

[0158] In some embodiments of the present application, please refer to Figure 7 , the thickness H2 of the second adsorbing member 24 is 0.5 mm - 3 mm.

[0159] The thickness H2 of the second adsorbent 24 refers to the dimension of the second adsorbent 24 along the thickness direction of the second wall 2122. The thickness H2 of the second adsorbent 24 can be selected and set within the above range according to actual application needs, and can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0160] By adopting the above technical solution, the thickness of the second adsorbent 24 is optimized, which not only enables the second adsorbent 24 to have good adsorption capacity, but also reduces the space occupied by the second adsorbent 24, thereby improving the volume energy density of the battery cell 20.

[0161] In some embodiments of the present application, the second adsorption component 24 is a porous foam component.

[0162] In other words, the second adsorption member 24 is made of porous foam, and the porous foam can be formed by closed-cell foaming of a mixture of polyurethane and acrylic.

[0163] By adopting the above technical solution, the adsorption capacity of the second adsorption member 24 is effectively improved.

[0164] In some embodiments of this application, please refer to Figure 4 , Figure 6 and Figure 7 The electrode assembly 22 includes an electrode body 221 and a pole ear 222. The pole ear 222 includes a first pole ear 2221 and a second pole ear 2222 with opposite polarities. The first pole ear 2221 and the second pole ear 2222 are connected to the side of the electrode body 221 facing away from the first wall 211 and are separated from each other. The first adsorbent 23 includes a first adsorbent body 231, a second adsorbent body 232 and a third adsorbent body 233. The first adsorbent 23 is arranged on the side of the electrode body 221 facing away from the first wall 211, wherein the first adsorbent body 231 is located between the first pole ear 2221 and the second pole ear 2222, the second adsorbent body 232 is located on the side of the first pole ear 2221 facing away from the second pole ear 2222, and the third adsorbent body 233 is located on the side of the second pole ear 2222 facing away from the first pole ear 2221.

[0165] The following comparative test is conducted by taking the battery cell 20 as a square shell battery cell and the electrolyte injection coefficient of the square shell battery cell as 5.5 as an example. Please refer to the following table. In the table, the basic group is a sample without the first adsorption member 23, and the comparative group is a sample with the first adsorption member 23:

[0166]

[0167] As can be seen from the above table, compared with the basic group, the first effect of the comparison group increased by about 3%, and the first effect of the comparison group was significantly greater than that of the basic group.

[0168] In the battery cycle test, the cycle life of the basic group is 300 cls, and the cycle life of the comparison group is 2000 cls. It can be seen that the cycle performance of the comparison group is much better than that of the basic group.

[0169] In the battery storage test at an ambient temperature of 25 °C, the storage days of the basic group are 180 days, and the storage days of the comparison group are 2000 days. It can be seen that the storage performance of the comparison group is much better than that of the basic group.

[0170] In some embodiments of the present application, please refer to Figure 4 、 Figure 6 and Figure 7 . The electrode assembly 22 includes an electrode body 221 and a tab 222. The tab 222 includes a first tab 2221 and a second tab 2222 with opposite polarities. The first tab 2221 and the second tab 2222 are connected to the side of the electrode body 221 facing away from the first wall 211 and are arranged separately from each other. The first adsorbent 23 includes a first adsorbent body 231, a second adsorbent body 232, and a third adsorbent body 233. The first adsorbent 23 is arranged on the side of the electrode body 221 facing away from the first wall 211. Among them, the first adsorbent body 231 is located between the first tab 2221 and the second tab 2222, the second adsorbent body 232 is located on the side of the first tab 2221 facing away from the second tab 2222, and the third adsorbent body 233 is located on the side of the second tab 2222 facing away from the first tab 2221. The second adsorbent 24 is connected to the first adsorbent 23 and extends from the first adsorbent 23 toward the first wall 211. The number of the second adsorbents 24 is multiple. Among them, at least one second adsorbent 24 is connected to the first adsorbent body 231, at least another second adsorbent 24 is connected to the second adsorbent body 232, and at least one more second adsorbent 24 is connected to the third adsorbent body 233.

[0171] Taking the battery cell 20 as a square shell battery cell and the electrolyte injection coefficient of the square shell battery cell as 5.5 as an example for a comparative test, please refer to the following table. In the table, the basic group is a sample without the first adsorbent 23 and the second adsorbent 24, and the comparison group is a sample with the first adsorbent 23 and the second adsorbent 24:

[0172]

[0173] As can be seen from the above table, compared with the basic group, the initial efficiency of the comparison group is increased by about 4%, and the initial efficiency of the comparison group is significantly greater than that of the basic group.

[0174] In the battery cycle test, the cycle life of the basic group is 300 cls, and the cycle life of the comparison group is 2200 cls. It can be seen that the cycle performance of the comparison group is much better than that of the basic group.

[0175] In the battery storage test at an ambient temperature of 25°C, the storage days of the basic group were 180 days, and the storage days of the comparison group were 2100 days. It can be seen that the storage performance of the comparison group is much better than that of the basic group.

[0176] In a second aspect, please refer to Figure 2 , the embodiment of the present application provides a battery 100, including the battery cell 20 described in any one of the above embodiments.

[0177] Since the battery 100 provided by the embodiment of the present application adopts the battery cell 20 described in any one of the above embodiments, the working performance of the battery 100 is effectively improved.

[0178] In a third aspect, please refer to Figure 1 , the embodiment of the present application provides an electrical device, including the above battery 100.

[0179] Since the electrical device provided by the embodiment of the present application adopts the above battery 100, the working performance of the electrical device is effectively improved.

[0180] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A battery cell, characterized in that: include: Electrolyte; Electrode assembly; A housing for accommodating the electrode assembly and the electrolyte, the housing comprising a first wall, the first wall supporting the electrode assembly and the electrolyte; A first adsorption member is disposed on a side of the electrode assembly facing away from the first wall; wherein at least a portion of the electrolyte is absorbed by the first adsorption member and can flow from the first adsorption member to a side of the electrode assembly facing away from the first wall; The electrode assembly comprises an electrode body and an electrode ear connected to the electrode body, and the first adsorption member is arranged on a side of the electrode body facing away from the first wall; The electrode tabs include a first electrode tab and a second electrode tab with opposite polarities, the first electrode tab and the second electrode tab are connected to the side of the electrode body facing away from the first wall and are spaced apart from each other, and the first adsorbent includes a first adsorbent body, which is disposed between the first electrode tab and the second electrode tab.

2. The battery cell according to claim 1, characterized in that: The first adsorbent further includes a second adsorbent and a third adsorbent. The second adsorbent is disposed on a side of the first pole tab facing away from the second pole tab, and the third adsorbent is disposed on a side of the second pole tab facing away from the first pole tab.

3. The battery cell according to claim 1, characterized in that: The first adsorption member is fixedly connected to the electrode assembly.

4. The battery cell according to claim 3, characterized in that: The battery cell further includes a first adhesive member, and the first adhesive member is bonded between the first adsorption member and the electrode assembly.

5. The battery cell according to claim 4, characterized in that: The first adhesive component is bonded to the side of the first adsorption component.

6. The battery cell according to claim 1, characterized in that: The thickness of the first adsorption member is 0.5 mm-3 mm.

7. The battery cell according to claim 1, characterized in that: The first adsorption component is a porous foam component.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The battery cell further includes a second adsorbent connected to the first adsorbent, the second adsorbent extending from the first adsorbent toward the first wall, at least a portion of the electrolyte is absorbed by the second adsorbent and can flow from the second adsorbent to the first adsorbent.

9. The battery cell according to claim 8, characterized in that: The number of the second adsorption components is plural.

10. The battery cell according to claim 9, characterized in that: The electrode assembly has two first side surfaces disposed opposite to each other and two second side surfaces disposed opposite to each other, the second side surfaces are connected between the two first side surfaces, the area of ​​the first side surface is larger than the area of ​​the second side surface, and at least two second adsorption members are disposed on the first side surface.

11. The battery cell according to claim 8, characterized in that: The second adsorption member is fixedly connected to the electrode assembly.

12. The battery cell according to claim 11, characterized in that: The battery cell further includes a second adhesive member, and the second adhesive member is bonded between the second adsorption member and the electrode assembly.

13. The battery cell according to claim 12, characterized in that: The second adhesive component is bonded to the side of the second adsorption component.

14. The battery cell according to claim 8, characterized in that: The thickness of the second adsorption member is 0.5 mm-3 mm.

15. The battery cell according to claim 8, characterized in that: The second adsorption component is a porous foam component.

16. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 15.

17. An electrical equipment, characterized in that: The electric device comprises the battery as claimed in claim 16.

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