Single battery, battery pack and electric equipment

Abstract

The utility model discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of batteries, a baffle plate is arranged in the single battery, and the baffle plate is arranged on one side of a laminated battery cell and is connected with a first insulating part of a cover plate assembly, so that the cover plate assembly can fix the baffle plate. In the formation negative pressure stage of the single battery, the baffle can support the side wall of the shell, reduce the deformation of the shell and keep a relatively large gap between the side wall of the shell and the laminated battery cell, so that the siphonic effect is weakened, and the electrolyte retention capacity of the single battery is improved; through holes are formed in the baffles, so that the storage space of the electrolyte is increased, and the electrolyte retention capacity is further improved; and furthermore, the infiltration capacity of the laminated battery cell can be improved, so that the single battery has relatively good electrochemical performance. Furthermore, the baffle can limit the laminated battery cell, so that slippage of the laminated battery cell in the shell is reduced or even avoided, hidden dangers and risks are reduced, and the safety performance is guaranteed.

Description

Technical Field

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

[0002] A stacked cell is a cell structure for a single cell prepared by a stacking process. After its positive electrode sheet, negative electrode sheet, and separator are alternately stacked, they are tightly bonded together through a hot pressing process and further constrained by edge gluing. For a single cell with a stacked cell as its core component, during the negative pressure formation stage, a large amount of electrolyte may be sucked away due to the siphon effect, resulting in insufficient electrolyte retention in the single cell, thereby affecting its electrochemical performance. Summary of the Utility Model

[0003] Utility Model Objectives: The embodiments of this application provide a single cell, aiming to solve the technical problem of insufficient electrolyte retention in a single cell with a stacked cell as its core component; another objective of this application is to provide a battery pack; another objective of the embodiments of this application is to provide an electrical device.

[0004] Technical Solution: A single cell described in the embodiments of this application has a width direction, and the single cell includes:

[0005] A housing having a receiving cavity;

[0006] A cover plate assembly connected to the housing and sealing the receiving cavity, the cover plate assembly including a first insulating member disposed in the receiving cavity;

[0007] A stacked cell disposed in the receiving cavity;

[0008] A baffle disposed in the receiving cavity and on at least one side of the stacked cell in the width direction, the baffle being connected to the first insulating member, and the baffle having a through hole penetrating along the width direction.

[0009] In some embodiments, the single cell further has a height direction, and the height direction intersects with the width direction;

[0010] The baffle includes a plurality of bending portions arranged along the height direction, each bending portion extending along an arc trajectory, adjacent two bending portions being connected to each other, and the protruding directions of adjacent two bending portions being opposite, and at least part of the bending portions having the through hole.

[0011] In some embodiments, the baffle extends linearly in the height direction of the single cell.

[0012] In some embodiments, baffles are provided on both sides of the laminated battery cell in the width direction, and the baffles are connected to the housing.

[0013] In some embodiments, the single battery further includes:

[0014] A second insulating member, disposed in the accommodating cavity, and covering the laminated battery cell and the baffle.

[0015] In some embodiments, the single battery further includes:

[0016] A third insulating member, disposed on a side of the baffle close to the laminated battery cell, and covering the laminated battery cell.

[0017] In some embodiments, the baffle has a plurality of through holes, and the plurality of through holes are arranged at intervals of each other.

[0018] In some embodiments, the baffle has a first side facing away from the laminated battery cell, and a contour pattern formed by the through holes on the first side is one or more of a polygon, a circle, and an ellipse.

[0019] Correspondingly, a battery pack according to an embodiment of the present application includes the single battery according to any one of the above embodiments.

[0020] Correspondingly, an electrical device according to an embodiment of the present application includes the single battery according to any one of the above embodiments; or includes the battery pack as described above.

[0021] Beneficial effects: The single battery in the embodiment of the present application uses a laminated battery cell, which can make full use of the space inside the housing, so that the single battery has a high volume energy density. The laminated battery cell is provided with a baffle on at least one side in the width direction, and the baffle is connected to the first insulating member of the cover assembly, so that the baffle can be fixed by the cover assembly, and the baffle can play a supporting role inside the housing. Specifically, in the negative pressure stage of the formation of the single battery, the baffle can support the side wall of the housing, reduce the inward deformation of the housing, and keep a large gap between the side wall of the housing and the laminated battery cell, thereby weakening the siphon effect and reducing the amount of electrolyte pumped away, and improving the electrolyte retention capacity of the single battery. In addition, the baffle is provided with through holes, and space is reserved through the through holes, increasing the storage space of the electrolyte and further improving the electrolyte retention capacity. Furthermore, it can improve the wetting ability of the laminated battery cell, so that the single battery has better electrochemical performance. Moreover, the baffle can limit the laminated battery cell, reduce or even avoid its slippage inside the housing, and can reduce potential hazards and risks such as tearing of the ear welding part or misalignment of the electrode sheet, so that the single battery has better safety performance.

[0022] The battery pack of the embodiments of the present application includes the above-mentioned single cell, and thus can have all the technical features and beneficial effects of the single cell, which will not be elaborated here.

[0023] The electrical equipment of the embodiments of the present application can include all the technical features and beneficial effects of the above-mentioned single cell or the above-mentioned battery pack, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the single cell provided by the embodiments of the present application;

[0026] Figure 2 It is an exploded and perspective view of the parts of the single cell provided by the first embodiment of the present application;

[0027] Figure 3 It is a perspective structural diagram of the single cell after removing the housing provided by the second embodiment of the present application;

[0028] Figure 4 It is a side perspective structural diagram of the single cell after removing the housing provided by some embodiments of the present application;

[0029] Figure 5 It is a perspective structural diagram of the single cell after removing the housing provided by the third embodiment of the present application;

[0030] Figure 6 It is a perspective structural diagram of the single cell after removing the housing provided by the fourth embodiment of the present application;

[0031] Figure 7 It is a schematic connection structure diagram of the cover plate assembly and the baffle of the single cell provided by some embodiments of the present application;

[0032] Figure 8 It is a three-dimensional structural diagram of the cover plate assembly and the baffle of the single cell provided by some embodiments of the present application;

[0033] Figure 9 It is a side perspective structural diagram of the single cell after removing the housing provided by some embodiments of the present application;

[0034] Figure 10 It is a side perspective structural diagram of the single cell after removing the housing provided by some embodiments of the present application;

[0035] Figure 11 A perspective side view structure diagram of a single cell after removing the housing according to some embodiments of the present application;

[0036] Figure 12 A perspective side view structure diagram of a single cell after removing the housing according to some embodiments of the present application;

[0037] Figure 13 A side view structure diagram of a cover assembly and a baffle of a single cell according to some embodiments of the present application;

[0038] Figure 14 A side view structure diagram of a cover assembly and a baffle of a single cell according to some embodiments of the present application;

[0039] Reference numerals: 100 - housing; 110 - accommodation cavity; 200 - cover assembly; 210 - first insulating member; 300 - laminated battery cell; 400 - baffle; 401 - first end; 402 - second end; 403 - bending portion; 410 - through hole; 500 - second insulating member; 600 - third insulating member. Detailed embodiments

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "height", "thickness", "upper", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the 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 therefore should not be construed as a limitation to the present application. In the description of the present application, "a plurality of" means two or more, and at least one means one, two or more, unless otherwise specifically defined.

[0042] In the drawings, the arrow marked with X indicates the width direction, and the arrow marked with Y indicates the height direction. In the description of the present application, the introduction of the width direction X and the height direction Y is to clearly describe the shapes and relative positional relationships of the components in the single cell. In actual applications, depending on the placement position and placement method of the single cell, the width direction X and the height direction Y can respectively point to any orientation in space. Optionally, the width direction X and the height direction Y are perpendicular to each other.

[0043] It should also be noted that in the description of the present application, a laminated battery cell, also known as a laminated battery or a stacked core, is a structural form of the electrode assembly inside a single battery cell. The laminated battery cell is directly pressed after the electrode sheets are stacked through a lamination technique. Specifically, the positive electrode sheet, the negative electrode sheet, and the separator are alternately stacked and then tightly bonded together through a hot pressing process, and further constrained by edge gluing. The battery cell prepared by the lamination process has characteristics such as high volumetric energy density and high safety and reliability at the end of its life. The laminated battery cell is generally in a cuboid structure, which occupies more internal space of the battery housing. During the production process, there are problems such as difficulty in electrolyte infiltration due to insufficient reserved space, and a large amount of electrolyte is pumped away due to the siphon effect during the negative pressure formation stage.

[0044] In view of this, an embodiment of the present application provides a single battery cell, aiming to solve at least one of the above technical problems.

[0045] Please refer to Figures 1 to 8 , the single battery cell of the embodiment of the present application includes a housing 100, a cover plate assembly 200, a laminated battery cell 300, and a baffle 400.

[0046] The housing 100 has a receiving cavity 110, which is used to accommodate internal components of the single battery cell including the laminated battery cell 300, the baffle 400, etc. The housing 100 can play a role in supporting and protecting the internal components of the single battery cell. Moreover, the housing 100 can seal, isolate, and block conductive substances, reducing the short circuit between the single battery cell and the external environment. In addition, the housing 100 can also play a certain role in thermal management. During the operation of the single battery cell, part of the heat generated can be dispersed and conducted through the housing 100 to prevent the single battery cell from overheating. Optionally, the housing 100 can be an aluminum shell, and its shape can be a cuboid.

[0047] The cover plate assembly 200 is connected to the housing 100 and seals the receiving cavity 110. The cover plate assembly 200 can provide sealing protection for the single battery cell. Specifically, the cover plate assembly 200 includes a cover plate body, which forms a sealed container by tightly combining with the housing 100, preventing external substances from entering the internal receiving cavity 110 of the single battery cell, thereby protecting the chemical reactions and active substances inside the single battery cell. In addition, structures such as the pole column and explosion-proof valve of the single battery cell can be arranged on the cover plate body. The cover plate assembly 200 includes a first insulating member 210 disposed in the receiving cavity 110, that is, the first insulating member 210 is disposed on the side of the cover plate body facing the laminated battery cell 300, and can be used for insulation between the cover plate body and the internal components of the single battery cell. The material of the first insulating member 210 includes but is not limited to plastics, rubbers, etc. Optionally, the first insulating member 210 can be a lower plastic.

[0048] The stacked cell 300 is disposed in the accommodation cavity 110. In this stacked cell 300, the positive electrode sheet, the negative electrode sheet, and the separator are stacked layer by layer to form a stacked structure. Among them, the separator can be cut and directly stacked with separator sheets, or the separator can be Z-folded and stacked without being cut.

[0049] The baffle 400 is disposed in the accommodation cavity 110 and is disposed on at least one side of the stacked cell 300 in the width direction X. The baffle 400 is connected to the first insulating member 210, and the baffle 400 has a through hole 410 penetrating in the width direction X.

[0050] Thus, the side wall of the housing 100 near the stacked cell 300 in the width direction X is spaced from the stacked cell 300 by the baffle 400, so that the distance between the stacked cell 300 and the side wall is larger. Moreover, the baffle 400 is also provided with a through hole 410, and a larger storage space is reserved through the through hole 410 to accommodate more electrolyte and improve the electrolyte retention amount. The baffle 400 is connected to the first insulating member 210 of the cover assembly 200, and the baffle 400 can be fixed through the cover assembly 200, and the baffle 400 can be restricted so that its relative position in the accommodation cavity 110 is not easily displaced. Thus, the baffle 400 can play a supporting role inside the housing 100. When processing the single cell, especially in the formation negative pressure stage, the baffle 400 can support the side wall of the housing 100, reduce the inward deformation amount of the housing 100, and keep a large gap between the side wall of the housing 100 and the stacked cell 300. Thus, the siphon effect in the negative pressure stage is weakened, the amount of electrolyte being pumped away is reduced, and the electrolyte retention amount is improved. The stacked cell 300 is sufficiently infiltrated with electrolyte, ensuring the electrochemical performance of the single cell. In addition, by disposing the baffle 400 on at least one side of the stacked cell 300 in the width direction X, the baffle 400 can limit the stacked cell 300 in the width direction X, reduce or even avoid its slippage inside the housing 100, and can reduce potential hazards and risks such as tearing of the tab welding part or misalignment of the electrode sheet, making the single cell have better safety performance.

[0051] In some embodiments, the single cell may include a plurality of baffles 400, and the laminated cell 300 is provided with baffles 400 on both sides in the width direction X. In this way, the two side walls of the housing 100 can be supported by the baffles 400 on both sides, increasing the clearance space between the laminated cell 300 and the housing 100, and further weakening the siphon effect. Moreover, by providing a plurality of baffles 400, there are more through holes 410, further increasing the storage space of the electrolyte and improving the retention amount of the electrolyte. Furthermore, the baffles 400 on both sides can limit the laminated cell 300 on both sides in the width direction X, better positioning the laminated cell 300, reducing the possibility of the laminated cell 300 slipping in the housing 100, and further reducing potential hazards and risks such as tearing of the tab welding part or misalignment of the electrode sheets, ensuring the safety performance of the single cell.

[0052] Optionally, the baffle 400 can be in contact with the side wall of the housing 100, so as to directly support the side wall of the housing 100 and reduce its inward deformation during the negative pressure stage. Or, a gap can be reserved between the baffle 400 and the side wall of the housing 100. When the side wall deforms inward due to negative pressure, it can be connected to the baffle 400, enabling the baffle 400 to support the side wall and prevent it from continuing to deform inward. By reserving a gap, the storage space of the electrolyte can be increased, and to a certain extent, the retention amount of the electrolyte can be increased.

[0053] Optionally, the baffle 400 can be connected to the bottom wall of the housing 100, so as to be more stably arranged in the accommodation cavity 110, improving the support effect on the side wall of the housing 100 and the limiting effect on the laminated cell 300.

[0054] Optionally, the baffle 400 can be in contact with the laminated cell 300, so as to directly limit the laminated cell 300 and prevent the laminated cell 300 from slipping, improving safety. Or, a gap can be reserved between the baffle 400 and the laminated cell 300. This gap allows the laminated cell 300 to only slip slightly, and by reserving a gap, the storage space of the electrolyte can be increased, and to a certain extent, the retention amount of the electrolyte can be increased.

[0055] Optionally, the material of the baffle 400 can be one of PP (Polypropylene), PPS (Phenylenesulfide), and ceramics.

[0056] Please refer to again Figures 2 to 4, in some embodiments, the baffle 400 extends linearly in the height direction Y of the single cell. Specifically, the baffle 400 includes a first end 401 and a second end 402. The first end 401 and the second end 402 are the corresponding two ends of the baffle 400 in the height direction Y. The first end 401 is connected to the first insulating member 210, and the second end 402 is disposed on the side of the first end 401 away from the cover assembly 200 in the height direction Y of the single cell. Among them, from the first end 401 to the second end 402, the baffle 400 extends linearly. That is to say, the baffle 400 is a straight plate. By setting the baffle 400 as a straight plate that extends linearly in the height direction Y, the space occupied by the accommodating cavity 110 of the housing 100 can be reduced, and thus more space can be reserved for the stacked electrode assembly 300 and the electrolyte, which can effectively improve the volume energy density of the single cell and can also improve the electrochemical performance of the single cell.

[0057] Please refer to again together with Figures 5 to 8 , in some embodiments, the baffle 400 includes a plurality of bending portions 403 arranged along the height direction Y, and each bending portion 403 extends along an arc trajectory. Two adjacent bending portions 403 are connected to each other, and the protruding directions of two adjacent bending portions 403 are opposite. Among them, at least part of the bending portions 403 have through holes 410. As Figure 7 shown, the part framed by the dotted line is a bending portion 403, and this bending portion 403 extends along an arc trajectory. When observed from the side of the bending portion 403, it is generally in a bow shape. By setting the baffle 400 as a plurality of bending portions 403 that are generally in a bow shape and are connected end to end in sequence, and setting the protruding directions of two adjacent bending portions 403 to be opposite, on the one hand, space can be reserved on the concave side of each bending portion 403, and thus the storage space of the electrolyte can be increased, and the liquid retention amount of the electrolyte can be improved; on the other hand, the elastic deformation ability of the baffle 400 along the width direction X can be increased. When the stacked electrode assembly 300 deforms during the cycle, the baffle 400 can deform accordingly, thus reducing the extrusion of the stacked electrode assembly 300 and ensuring the cycle performance and safety of the single cell.

[0058] Please combine with Figure 13 and Figure 14 , at least part of the bending portions 403 have through holes 410, and the through holes 410 can communicate with the space reserved on the concave side, which can further increase the storage space of the electrolyte. Among them, in the Figure 13 shown embodiment, each through hole 410 is completely arranged on one bending portion 403, and the electrolyte stored in the through hole 410 can flow mutually with the electrolyte in the space on the concave side of the corresponding bending portion 403, so that the electrolyte in the through hole 410 and the corresponding space remains uniform. In Figure 14In the illustrated embodiment, a part of each through hole 410 is disposed on one bending portion 403, and the other part is disposed on another bending portion 403, so that the through hole 410 can communicate with the reserved spaces on the concave sides of two adjacent bending portions 403 respectively, thereby facilitating the mutual replenishment of the electrolytes in the respective reserved spaces, equalizing the liquid volume, and enhancing the wetting effect on the stacked battery cell 300.

[0059] Please refer to again Figure 4 and Figure 7 , in some embodiments, in the width direction X, the baffle 400 has a thickness dimension L, satisfying: 0.5 mm ≤ L ≤ 10 mm. Wherein, the thickness dimension L is the distance between the opposite side surfaces of the baffle 400 in the width direction X, and this distance can be measured by dimensional measuring tools such as vernier calipers and micrometers. When the baffle 400 is Figure 4 the straight plate shown, the dimensions of the baffle 400 from the first end 401 to the second end 402 are substantially the same, and the thickness dimension of the baffle 400 can be obtained by measuring the distances between the two side surfaces at multiple positions and taking the average value. When the baffle 400 is Figure 7 the "S"-shaped plate including a plurality of bending portions 403 shown, the thickness dimension L can be measured at the protruding positions of the bending portions 403, and the minimum distance between the two side surfaces along the width direction X can be measured to obtain the thickness dimension L.

[0060] Wherein, the thickness dimension L satisfies: 0.5 mm ≤ L ≤ 10 mm. That is, the thickness dimension L can be any value among 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, 10 mm or the range value between any two values. Controlling the thickness dimension L within this range can, on the one hand, maintain the supporting performance of the baffle 400 for the side wall of the housing 100 and the stacked battery cell 300, and on the other hand, can also simultaneously meet the requirement of having sufficient space to set the through holes 410 to reserve storage space for the electrolyte and reduce the occupation of the internal space of the single battery. Within this range, the smaller the thickness dimension L of the baffle 400, the thinner it is, the less space it occupies in the accommodation cavity 110, and the more beneficial it is to improve the volume energy density of the single battery. When the thickness dimension L of the baffle 400 is larger, it means it is thicker, the strength of the baffle 400 will be greater, and the supporting performance for the side wall of the housing 100 and the stacked battery cell 300 will be better; and the dimension of the through hole 410 in the width direction X is larger, and the storage space formed by the through hole 410 is larger, which is beneficial to improving the liquid retention amount of the electrolyte.

[0061] Please refer to together Figure 2 andFigure 5 , in some embodiments, the single cell further includes a second insulating member 500 disposed in the accommodation cavity 110 and covering the laminated battery cell 300 and the baffle 400. By covering the laminated battery cell 300 and the baffle 400 with the second insulating member 500, on the one hand, the insulation performance between the laminated battery cell 300 and the housing 100 is ensured, and on the other hand, the stability of the baffle 400 can be improved, so that it has a better limiting effect on the laminated battery cell 300 and improves the supporting performance of the baffle 400 on the side wall of the housing 100. Wherein, the second insulating member 500 can be a mylar film, which can be covered on the outer sides of the laminated battery cell 300 and the baffle 400 and heat-melted to the first insulating member 210 to further ensure insulation and structural stability.

[0062] Please refer to Figure 3 and Figure 6 , in some embodiments, the single cell further includes a third insulating member 600 disposed on the side of the baffle 400 close to the laminated battery cell 300 and covering the laminated battery cell 300. That is, the third insulating member 600 is disposed on the side of the baffle 400 away from the side wall of the housing 100, so that the insulation performance between the laminated battery cell 300 and the housing 100 can also be ensured.

[0063] Please refer to Figures 8 to 14 , in some embodiments, the baffle 400 has a plurality of through holes 410 arranged at intervals of each other. By providing the plurality of through holes 410, the reserved space is further increased, the storage space of the electrolyte is improved, the wetting ability of the laminated battery cell 300 is improved, and thus the electrochemical performance of the single cell is improved.

[0064] Please refer to again Figures 8 to 14 , in some embodiments, the baffle 400 has a first side surface 420 facing away from the laminated battery cell 300, and the first side surface 420 faces the side wall of the housing 100. The contour pattern formed by the through holes 410 on the first side surface 420 is one or more of a polygon, a circle, and an ellipse. For example, in Figure 8 , Figures 11 to 14 , the contour pattern can be one of a square, a rectangle, and a rhombus, or other polygons such as a triangle, a pentagon, and a hexagon. In Figure 9 and Figure 10 , the contour pattern can be a circle and an ellipse. For the plurality of through holes 410, the plurality of contour patterns formed on the first side surface 420 can be different. It should be noted that the contour pattern formed by the through holes 410 on the first side surface 420 may not be a standard shape as described above, as long as it is approximately the above shape.

[0065] Correspondingly, an embodiment of the present application further provides a battery pack, which includes the single battery of any one of the above embodiments, and thus can have all the technical features and technical effects of the single battery. Among them, the battery pack may include a box body and a plurality of the above single batteries, a battery management system, a cooling device, etc. arranged in the box body, which will not be elaborated here.

[0066] Correspondingly, an embodiment of the present application further provides an electrical device, which includes the single battery of any one of the above embodiments; or includes the battery pack of the above embodiment. The electrical device may be a mobile phone, a portable device, a laptop computer, a battery car, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool, etc. For example, spacecraft includes airplanes, rockets, space shuttles, spaceships, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers. It can be understood that the electrical device may include all the technical features and beneficial effects of the above single battery or battery pack, which will not be elaborated here.

[0067] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0068] The above has introduced in detail the single battery, battery pack and electrical device provided by the embodiments of the present application, and specific examples have been used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: Having a width direction, the single battery comprises: A housing having a receiving cavity; A cover plate assembly connected to the housing and covering the accommodating cavity, wherein the cover plate assembly comprises a first insulating member disposed in the accommodating cavity; A laminated battery core is arranged in the accommodating cavity; A baffle is arranged in the accommodating cavity and on at least one side of the laminated battery core in the width direction. The baffle is connected to the first insulating member and has a through hole penetrating along the width direction.

2. The single cell according to claim 1, characterized in that: The single battery also has a height direction, and the height direction intersects with the width direction; The baffle includes a plurality of bent portions arranged along the height direction, each of the bent portions extends along an arc track, two adjacent bent portions are connected to each other, and the protrusion directions of two adjacent bent portions are opposite, and at least part of the bent portions has the through hole.

3. The single cell according to claim 1, characterized in that: The baffle extends in a straight line in a height direction of the unit battery.

4. The single cell according to claim 1, characterized in that: The baffles are disposed on both sides of the laminated battery core in the width direction, and the baffles are connected to the shell.

5. The single cell according to claim 1, characterized in that: The single cell battery further comprises: The second insulating member is disposed in the accommodating cavity and covers the laminated battery core and the baffle.

6. The single cell according to claim 1, characterized in that: The single cell battery further comprises: The third insulating member is arranged on a side of the baffle close to the laminated battery core and covers the laminated battery core.

7. The single cell according to claim 1, characterized in that: The baffle has a plurality of through holes, and the plurality of through holes are arranged in an interval arrangement with each other.

8. The single cell according to claim 1 or 7, characterized in that: The baffle has a first side surface facing away from the laminated battery core, and the contour pattern formed by the through hole on the first side surface is one or more of a polygon, a circle, and an ellipse.

9. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: A single cell comprising any one of claims 1 to 8; or a battery pack comprising the battery pack according to claim 9.

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