Side plate of battery monomer and battery monomer with same

Abstract

The utility model discloses a side plate of a battery monomer and a battery monomer with the side plate, the battery monomer comprises a shell and an electrode assembly, the electrode assembly is of a winding type, the two side surfaces of the electrode assembly in the width direction are first side surfaces and form convex cambered surfaces, the side plate is arranged between the shell and the first side surfaces, and the side plate is arranged between the shell and the first side surfaces. The surface, facing the first side face, of the side plate is a first surface, and the first surface is a concave arc surface. According to the side plate of the single battery disclosed by the utility model, the first surface, facing the electrode assembly, of the side plate is arranged to be the concave cambered surface, and the first surface of the side plate can be in surface contact with the first side surface of the electrode assembly, so that when the electrode assembly is subjected to thermal runaway, the side plate can provide support for the electrode assembly; therefore, stress concentration caused by contact between the side plate and the electrode assembly lead is avoided, and the phenomenon that the electrode assembly is locally torn is avoided, so that thermal runaway fire of the electrode assembly can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a side plate of a battery cell and a battery cell having the side plate. Background Art

[0002] Relevant technologies point out that when an electrode assembly experiences thermal runaway, local damage is likely to occur on the surface of the electrode assembly, making the electrode sheet in this area more easily broken by the impact of airflow when the electrode assembly is in thermal runaway state. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a side plate of a battery cell, which can provide effective support for a wound electrode assembly, thereby preventing the electrode assembly from being partially torn.

[0004] The utility model also provides a battery monomer having the side plate.

[0005] According to the side plate of the battery cell of the first aspect embodiment of the utility model, the battery cell includes a shell and an electrode assembly, the electrode assembly is of a wound type, both side surfaces of the electrode assembly in the width direction are first side surfaces and are formed as convex arc surfaces, the side plate is arranged between the shell and the first side surface, the surface of the side plate facing the first side surface is the first surface, and the first surface is a concave arc surface.

[0006] According to the side plate of the battery cell of the utility model, by setting the first surface of the side plate facing the electrode assembly as a sunken arc surface, the first surface of the side plate and the first side surface of the electrode assembly can achieve surface contact. When the electrode assembly has thermal runaway, the side plate can provide support for the electrode assembly, avoid the side plate and the electrode assembly lead contact resulting in force concentration, avoid the electrode assembly being partially torn, and thus effectively prevent the electrode assembly from thermal runaway and fire.

[0007] According to some embodiments of the present invention, the first surface is parallel to the first side surface, and the first surface is configured to be suitable for fitting with the first side surface.

[0008] According to some embodiments of the present invention, the side panel has a second surface opposite to the first surface, and a minimum distance between the first surface and the second surface is greater than or equal to 1 mm.

[0009] According to some embodiments of the present invention, the side plate is a high temperature resistant insulating member.

[0010] According to some embodiments of the present invention, the side panel is a mica panel.

[0011] According to the battery cell of the embodiment of the second aspect of the utility model, the battery cell includes: a shell, the shell has a accommodating cavity; an electrode assembly, the electrode assembly is arranged in the accommodating cavity and is wound, the surfaces of the electrode assembly on both sides in the width direction are first side surfaces, and the first side surfaces are convex arc surfaces; according to the side plate of the embodiment of the first aspect of the utility model, the side plate is arranged in the accommodating cavity and is located on at least one side of the electrode assembly in the width direction, and at least a part of the first surface is suitable for fitting with the first side surface.

[0012] According to the battery cell of the second embodiment of the utility model, by setting the side plate of the above-mentioned first embodiment, the first surface of the side plate facing the electrode assembly is set as an inwardly recessed arc surface, and the first surface of the side plate and the first side surface of the electrode assembly can achieve surface contact. When the electrode assembly has thermal runaway, the side plate can provide support for the electrode assembly, avoid the side plate and the electrode assembly lead contact resulting in force concentration, avoid the electrode assembly being partially torn, and thus effectively avoid thermal runaway and fire of the electrode assembly.

[0013] According to some embodiments of the present invention, in the length direction of the shell, at least one end of the side plate is flush with the end of the electrode assembly or exceeds the end of the electrode assembly.

[0014] According to some embodiments of the present invention, in the thickness direction of the shell, the width of the side plate is equal to the width dimension of the accommodating cavity.

[0015] According to some embodiments of the present invention, the difference between the length of the side panel and the length of the shell is greater than or equal to 5 mm; or the thickness of the shell is 0.3 mm-1 mm.

[0016] According to some embodiments of the present invention, the battery cell further includes: a cover plate assembly, one side of the shell is open, and the cover plate assembly is covered on the open side of the shell; and / or an insulating film, the insulating film is wrapped around the outside of the electrode assembly.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model without a top cover assembly;

[0019] Figure 2 yes Figure 1 A schematic diagram of another angle of the TV unit shown in ;

[0020] Figure 3 yes Figure 1 Schematic diagram of the side panel shown in .

[0021] Reference numerals:

[0022] 1000, battery cell;

[0023] 100, side panel; 10, first surface;

[0024] 200, shell; 300, electrode assembly; 310, first side surface. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Reference below Figure 1-3 The side plate 100 of the battery cell 1000 according to the first embodiment of the present invention is described.

[0027] The following is a brief description of a battery cell 1000 according to an embodiment of the second aspect of the present invention. The battery cell 1000 includes a housing 200, an electrode assembly 300, and a side plate 100 of the battery cell 1000 according to an embodiment of the first aspect of the present invention. The electrode assembly 300 and the side plate 100 are both disposed in the housing 200. The electrode assembly 300 is a wound type. The electrode assembly 300 is in a width direction (e.g., Figure 1 Both side surfaces in the left-right direction (as shown) are first side surfaces 310, and the first side surfaces 310 are formed as convex arc surfaces.

[0028] The side plate 100 of the first embodiment of the utility model is disposed between the housing 200 and the first side surface 310 , and the surface of the side plate 100 facing the first side surface 310 is the first surface 10 , and the first surface 10 is a concave arc surface.

[0029] For example Figure 1 and Figure 3As shown, the shell 200 is sleeved on the outside of the side plate 100 and the electrode assembly 300, and there are two side plates 100. The two side plates 100 are respectively located between the two side surfaces of the shell 200 in the left and right directions and the two side surfaces of the electrode assembly 300 in the left and right directions. The electrode assembly 300 is a winding type, that is, the electrode assembly 300 is formed by winding the pole piece, and the raised arc surfaces on both sides of the electrode assembly 300 in the left and right directions are the first side surfaces 310, and the right side surface of the side plate 100 located on the left side of the electrode assembly 300 is the first surface 10, which is formed as an arc-shaped cylinder concave toward the left side, and the left side surface of the side plate 100 located on the right side of the electrode assembly 300 is also the first surface 10, which is formed as an arc-shaped cylinder concave toward the right side.

[0030] It should be noted that, in the prior art, the side plate 100 is usually a flat plate. When the electrode assembly 300 is in a wound type, there is a line contact between the side plate 100 and the electrode assembly 300, and the side plate 100 does not provide good support for the electrode assembly 300. At the same time, the first side surface 310 is not supported by the side plate 100 on both sides in the thickness direction of the electrode assembly 300. In this way, during the use of the battery cell 1000, the unsupported portion of the first side surface 310 is prone to extrusion and tearing.

[0031] The side plate 100 of the present embodiment can achieve surface contact with the first side surface 310 of the electrode assembly 300 through the first surface 10. This can not only increase the contact area between the first side surface 310 and the first surface 10, so that the first side surface 310 is evenly stressed, thereby avoiding local squeezing and tearing of the electrode assembly 300, but also the side plate 100 can effectively support the electrode assembly 300, which is beneficial to improving the mechanical strength of the electrode assembly 300, thereby avoiding the electrode assembly 300 from catching fire due to thermal runaway.

[0032] According to the first embodiment of the utility model, by setting the first surface 10 of the side plate 100 facing the electrode assembly 300 as a recessed arc surface, the first surface 10 of the side plate 100 and the first side surface 310 of the electrode assembly 300 can achieve surface contact. When the electrode assembly 300 has thermal runaway, the side plate 100 can provide support for the electrode assembly 300, avoid the side plate 100 and the electrode assembly 300 lead contact resulting in force concentration, avoid the electrode assembly 300 being partially torn, and thus effectively avoid thermal runaway and fire of the electrode assembly 300.

[0033] According to some embodiments of the present invention, referring to Figure 2 The first surface 10 may be parallel to the first side surface 310 , and the first surface 10 is configured to be suitable for being attached to the first side surface 310 .

[0034] For example Figure 2As shown, the first surface 10 can be formed as a concave surface with a circular arc cross-section, and the first side surface 310 can also be formed as a concave surface with a circular arc cross-section, and the arc radius of the first surface 10 and the first side surface 310 are the same, or, the first surface 10 is an elliptical arc cylinder, the first side surface 310 is an elliptical arc cylinder, and the elliptical arc parameters of the first surface 10 and the first side surface 310 are the same.

[0035] It should be noted that, during the assembly of the battery cell 1000, since the electrode assembly 300 does not expand in the initial state, the first surface 10 of the side plate 100 and the first side surface 310 of the electrode assembly 300 can be parallel, and there is a gap between the first surface 10 and the first side surface 310, and the gap between the first surface 10 and the first side surface 310 is less than 1 mm, so as to reserve a certain space for the expansion of the electrode assembly 300. During the use of the battery cell 1000, the electrode assembly 300 will expand, and the first side surface 310 of the expanded electrode assembly 300 can be completely fitted and abutted with the first surface 10. At this time, the side plate 100 can effectively support the electrode assembly 300 through the first surface 10.

[0036] In this embodiment, by setting the first side surface 310 to be parallel to the first surface 10, and the first side surface 310 and the first surface 10 can be in contact with each other, the contact area between the first side surface 310 and the first surface 10 can be further increased, so that the first side surface 310 of the electrode assembly 300 can be evenly stressed, and the electrode assembly 300 can be effectively protected.

[0037] According to some embodiments of the present invention, Figure 3 As shown, the side plate 100 may have a second surface opposite to the first surface 10 , and the minimum distance between the first surface 10 and the second surface is greater than or equal to 1 mm.

[0038] For example Figure 3 As shown, the right side surface of the side panel 100 is the first surface 10, and the first surface 10 is formed as a concave arc cylinder, the left side surface of the side panel 100 is the second surface, the second surface is a plane perpendicular to the left and right directions, and the second surface faces the inner wall surface of the shell 200, wherein the minimum spacing between the first surface 10 and the second surface is T, and the minimum spacing T between the first surface 10 and the second surface can be 1mm, 1.1mm, 1.2mm, 1.3mm or 1.4mm, etc.

[0039] Among them, the minimum spacing between the first surface 10 and the second surface is greater than or equal to 1 mm, that is, the minimum thickness of the side panel 100 is greater than or equal to 1 mm, that is, in the thickness direction of the side panel 100, the thickness of the side panel 100 at the lowest point of the depression on the first surface 10 is greater than or equal to 1 mm.

[0040] In this embodiment, the minimum distance between the first surface 10 and the second surface is set to be greater than or equal to 1 mm. The minimum distance between the first surface 10 and the second surface is where the structural strength of the side panel 100 is lower, thereby ensuring the overall structural strength of the side panel 100.

[0041] Preferably, the radius of the circular arc or elliptical arc of the first surface 10 is consistent with the radius of the circular arc or elliptical arc of the first side surface 310, thereby ensuring that after the battery cell 1000 is charged, the first side surface 310 of the electrode assembly 300 is perfectly fitted with the first surface 10 of the side plate 100. At the same time, the second surface of the side plate 100 is fitted with the inner wall surface of the shell 200.

[0042] According to some embodiments of the present invention, the side plate 100 may be a high temperature resistant insulating member.

[0043] For example, the side plate 100 may be a mica plate, or the side plate 100 may be an oxide material or other high temperature resistant insulating material. Specifically, the heat resistant temperature of the side plate 100 is greater than or equal to 500°C.

[0044] In this embodiment, by setting the side plate 100 as a high temperature resistant insulating member, the side plate 100 can ensure the structural strength of the side plate 100 itself when the electrode assembly 300 is in thermal runaway, and can also play an insulating role, thereby effectively protecting the electrode assembly 300. In addition, the high temperature resistant insulating member has good chemical stability and electrochemical stability, has high hardness, and is not easy to deform.

[0045] According to some embodiments of the present invention, the side plate 100 is a mica plate.

[0046] In this embodiment, the side plate 100 is made of a mica plate, which has good insulation and high temperature resistance, and can effectively protect the electrode assembly 300 .

[0047] According to the battery cell 1000 of the embodiment of the second aspect of the present invention, the battery cell 1000 of this embodiment may be a lithium-ion battery cell 1000.

[0048] Specifically, the battery cell 1000 includes: a housing 200 , an electrode assembly 300 , and a side plate 100 according to an embodiment of the first aspect of the present invention.

[0049] The housing 200 has a receiving cavity; the electrode assembly 300 is disposed in the receiving cavity, and the electrode assembly 300 is wound, and the electrode assembly 300 is Figure 2The surfaces on both sides in the left-right direction (as shown in the figure) are the first side surfaces 310, and the first side surfaces 310 are convex arc surfaces; the side plate 100 is arranged in the accommodating cavity, and the side plate 100 is located on at least one side of the electrode assembly 300 in the width direction, and at least a portion of the first surface 10 is suitable for fitting with the first side surface 310.

[0050] For example Figure 1 As shown, the shell 200 is sleeved on the outside of the side plate 100 and the electrode assembly 300, the electrode assembly 300 is arranged in the accommodating cavity and is wound, and the surfaces of both sides of the electrode assembly 300 in the left and right directions are first side surfaces 310, and the first side surfaces 310 are arc surfaces convex toward the left and right sides. The side plate 100 is located between the shell 200 and the electrode assembly 300.

[0051] The side plate 100 may be disposed on only one side of the electrode assembly 300, for example, the side plate 100 may be disposed only on the left side of the electrode assembly 300, or only on the right side of the electrode assembly 300. Of course, the side plate 100 may be disposed on both sides in the width direction of the electrode assembly 300. The side of the side plate 100 facing the electrode assembly 300 is the first surface 10, and the first surface 10 may be completely or partially in contact with the first side surface 310.

[0052] According to the battery cell 1000 of the second embodiment of the utility model, by setting the side plate 100 of the first embodiment, the first surface 10 of the side plate 100 facing the electrode assembly 300 is set to a recessed arc surface, and the first surface 10 of the side plate 100 and the first side surface 310 of the electrode assembly 300 can achieve surface contact. When the electrode assembly 300 has thermal runaway, the side plate 100 can provide support for the electrode assembly 300 to avoid the side plate 100 and the electrode assembly 300 lead contact resulting in force concentration, and avoid the electrode assembly 300 being partially torn, thereby effectively preventing the electrode assembly 300 from thermal runaway and catching fire.

[0053] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 , in the length direction of the housing 200 (eg Figure 1 In the front-to-rear direction shown in FIG, at least one end of the side plate 100 is flush with or exceeds the end of the electrode assembly 300.

[0054] That is to say, in the length direction of the shell 200, only one end of the side plate 100 may be flush with one end of the electrode assembly 300, or both ends of the side plate 100 may be flush with both ends of the electrode assembly 300 respectively; or only one end of the side plate 100 may extend beyond one end of the electrode assembly 300, or both ends of the side plate 100 may extend beyond both ends of the electrode assembly 300 respectively.

[0055] Preferably, both ends of the side plate 100 in the length direction are flush with the electrode assembly 300, so that the length L of the side plate 100 is consistent with the length of the electrode assembly 300. Therefore, the side plate 100 can support the electrode assembly 300 in the entire length range.

[0056] In this embodiment, by setting at least one end of the side plate 100 to be flush with or beyond the end of the electrode assembly 300 , it can be ensured that the first side surface 310 of the electrode assembly 300 in the length direction of the shell 200 is protected by the side plate 100 .

[0057] According to some embodiments of the present invention, the width of the side plate 100 is equal to the width of the accommodating cavity in the thickness direction of the housing 200. In other words, in the thickness direction of the housing 200, the width H of the side plate 100 is consistent with the width of the interior of the housing 200.

[0058] For example Figure 2 As shown, the width H of the side panel 100 refers to the distance between the two sides of the side panel 100 in the up and down directions, and the width of the accommodating cavity refers to the distance between the bottom wall and the top wall of the accommodating cavity, wherein the width H of the side panel 100 is equal to the width of the accommodating cavity.

[0059] In this embodiment, by setting the width of the side panel 100 to be equal to the width of the accommodating cavity, the two side surfaces of the side panel 100 in the thickness direction of the shell 200 can abut against and press against the two side surfaces of the accommodating cavity in the thickness direction of the shell 200, thereby fixing the side panel 100 and preventing it from moving.

[0060] According to some embodiments of the present invention, the thickness of the housing 200 is 0.3 mm-1 mm. For example, the thickness of the housing 200 may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or 0.9 mm. In this embodiment, by setting the thickness of the housing 200 to 0.3 mm-1 mm, the structural strength of the housing 200 can be ensured.

[0061] According to some embodiments of the present invention, the difference between the length of the side plate 100 and the length of the housing 200 may be greater than or equal to 5 mm. For example, the difference between the length of the side plate 100 and the length of the housing 200 may be 5 mm, 5.2 mm, 5.4 mm, or 5.6 mm, 5.8 mm.

[0062] In this embodiment, by setting the difference between the length of the side panel 100 and the length of the shell 200 to be greater than or equal to 5 mm, assembly space can be reserved for the cover plate at at least one end of the shell 200 to ensure that the welding connection between the shell 200 and the cover plate is not affected.

[0063] Preferably, the shell 200 of the battery cell 1000 is an aluminum shell with a thickness of 0.3-1 mm. The shell 200 is square in shape, and one end face of the shell 200 in the length direction is open, that is, one end of the shell 200 in the length direction is open to form an opening to facilitate the placement of the electrode assembly 300 and the side plate 100.

[0064] According to some embodiments of the present invention, the battery cell 1000 may further include: a cover plate assembly, one side of the shell 200 is open, and the cover plate assembly is covered on the open side of the shell 200; and / or, an insulating film, the insulating film is wrapped around the outside of the electrode assembly 300.

[0065] In this embodiment, one side of the shell 200 is opened, and the cover assembly is covered on the open side of the shell 200, which can facilitate the assembly of the electrode assembly 300 and the side plate 100. The cover assembly can also protect the interior of the shell 200. At the same time, the insulating film is wrapped around the outside of the electrode assembly 300, which can further insulate and protect the electrode assembly 300.

[0066] The following draft Figure 1-Figure 3 A battery cell 1000 according to a specific embodiment of the present invention is described.

[0067] like Figure 1 and Figure 2 As shown, the battery cell 1000 includes a housing 200 , a wound electrode assembly 300 , and two side plates 100 .

[0068] The shell 200 is an aluminum shell with a thickness of 0.3-1 mm. The shell 200 is square in shape, with one end surface open to facilitate the placement of the electrode assembly 300 and two side plates 100. The two side plates 100 have the same structure and are symmetrically arranged on the left and right sides of the electrode assembly 300.

[0069] The side plate 100 is mainly made of mica or oxide material or other high temperature resistant insulating material (at least 500°C), has good chemical stability and electrochemical stability, has high hardness, and is not easy to deform. The length L of the side plate 100 is consistent with the length of the electrode assembly 300, the height H of the side plate 100 is consistent with the internal width of the shell 200 along the thickness direction of the shell 200, and the width W of the side plate 100 is about 1 mm larger than the radius of the first side surface 310 of the electrode assembly 300.

[0070] The arc radius of the first surface 10 of the side plate 100 is consistent with the outermost radius of the arc area of ​​the electrode assembly 300 (the radius of the first side surface 310), so as to ensure that after the battery cell is charged, the first side surface 310 is perfectly fitted with the first surface 10 of the side plate 100. The second surface of the side plate 100 facing the first surface 10 is fitted with the inner side of the shell 200.

[0071] The electrode assembly 300 is wound into groups, and the outer layer of the electrode assembly 300 is wrapped with an insulating film, which may be a mylar film. The distance between the first side surface 310 of the electrode assembly 300 and the first surface 10 of the side plate 100 is less than 1 mm to provide a certain space for the charging expansion of the electrode assembly 300.

[0072] When the electrode assembly 300 is assembled and placed inside the shell 200, the two large surfaces of the electrode assembly 300 in the thickness direction are in close contact with the upper and lower walls of the inner wall of the battery shell 200. The length of the side plate 100 is at least 5 mm shorter than the length of the shell 200 and is the same as the length of the electrode assembly 300 to ensure that the peripheral welding between the cover plate assembly and the shell 200 is not affected.

[0073] When the battery cell 1000 is fully charged, the distance between material layers increases due to lithium ion intercalation, and the electrode assembly 300 expands. The expanded electrode assembly 300 is attached to the first surface 10 of the two side plates 100 to provide certain support to the arc weak area of ​​the electrode assembly 300 to ensure that the area is evenly stressed, thereby improving the mechanical strength of the electrode assembly 300. When the battery cell 1000 has thermal runaway, due to the protective support of the side plate 100, the risk of tearing of the arc area on the side of the electrode assembly 300 will be greatly reduced, and the number of pole pieces ejected from the explosion-proof valve with the gas will be greatly reduced, and the risk of thermal runaway fire of the battery cell 1000 will also be reduced.

[0074] According to the battery cell 1000 of the embodiment of the utility model, the safety of the battery cell 1000 in the whole life cycle can be effectively improved, the arc area of ​​the electrode assembly 300 can be prevented from tearing in the thermal runaway state, and the fire risk of the battery cell due to thermal runaway can be reduced.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A side plate of a battery cell, the battery cell comprising a shell and an electrode assembly, the electrode assembly is wound, both side surfaces of the electrode assembly in the width direction are first side surfaces and are formed into convex arc surfaces, characterized in that: The side plate is disposed between the shell and the first side surface. The surface of the side plate facing the first side surface is a first surface. The first surface is a concave arc surface.

2. The side plate of the battery cell according to claim 1, characterized in that: The first surface is parallel to the first side surface, and the first surface is configured to be suitable for being attached to the first side surface.

3. The side plate of the battery cell according to claim 1, characterized in that: The side plate has a second surface opposite to the first surface, and a minimum distance between the first surface and the second surface is greater than or equal to 1 mm.

4. The side plate of a battery cell according to any one of claims 1 to 3, characterized in that: The side plate is a high temperature resistant insulating member.

5. The side plate of the battery cell according to claim 4, characterized in that: The side plate is a mica plate.

6. A battery cell, characterized in that: include: A housing having a receiving cavity; An electrode assembly, the electrode assembly is disposed in the accommodating cavity and is of a wound type, the surfaces of both sides of the electrode assembly in the width direction are first side surfaces, and the first side surfaces are convex arc surfaces; According to any one of claims 1-5, the side plate is arranged in the accommodating cavity and is located on at least one side of the electrode assembly in the width direction, and at least a portion of the first surface is suitable for fitting with the first side surface.

7. The battery cell according to claim 6, characterized in that: In the length direction of the shell, at least one end of the side plate is flush with or exceeds the end of the electrode assembly.

8. The battery cell according to claim 6, characterized in that: In the thickness direction of the shell, the width of the side plate is equal to the width dimension of the accommodating cavity.

9. The battery cell according to claim 6, characterized in that: The difference between the length of the side plate and the length of the shell is greater than or equal to 5 mm; or, The thickness of the shell is 0.3mm-1mm.

10. The battery cell according to claim 6, characterized in that: Also includes: A cover plate assembly, one side of the shell is open, and the cover plate assembly is arranged to cover the open side of the shell; and / or, An insulating film is wrapped around the outside of the electrode assembly.

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