Insulation assembly, battery monomer and battery

Abstract

The utility model relates to an insulating assembly, a battery cell and a battery. The insulation assembly comprises a first insulation part, the first insulation part comprises a cover plate and a side plate, the side plate is arranged in the circumferential direction of the cover plate, the side plate and the cover plate define a first insulation cavity for containing the main body part of the electrode assembly, the cover plate is provided with an eccentrically-arranged hollow hole, and the hollow hole is used for leading out a tab; the second insulating part can be folded or unfolded relative to the first insulating part, and when the second insulating part is folded to the side, back on to the first insulating cavity, of the cover plate, the second insulating part and the cover plate define a second insulating cavity for containing a tab of the electrode assembly. The insulation assembly, the battery monomer and the battery provided by the utility model can improve the insulation stability.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an insulating component, a battery cell, and a battery. Background Technology

[0002] In recent years, the new energy industry has received increasing attention, and batteries, as an important component of this industry, occupy a large market share. A battery is formed by connecting multiple individual cells in series, parallel, or a combination of both. Individual cells are typically designed with tabs on the electrode assembly connected to terminals mounted on end caps; however, insulation is required between the tabs and end caps, and between the tabs and the casing.

[0003] The common insulation method is to place a plastic sheet on the side of the end cap facing the tab to achieve insulation between the tab and the end cap, and to attach insulating tape to the tab to achieve insulation between the tab and the shell.

[0004] However, the aforementioned plastic is prone to warping and deformation, and the insulating tape may peel off after long-term use. All of these will affect the stability of the battery cell insulation and increase the risk of short circuit in the battery cell. Utility Model Content

[0005] Therefore, it is necessary to provide an insulating component, battery cell, and battery that can improve insulation stability in response to the above problems.

[0006] An insulating component, the insulating component comprising:

[0007] The first insulating element includes a cover plate and a side plate. The side plate is arranged around the cover plate in the circumferential direction and defines a first insulating cavity with the cover plate to accommodate the main body of the electrode assembly. The cover plate has an eccentrically arranged hollow hole for leading out the electrode tab.

[0008] The second insulating member is foldable or unfoldable relative to the first insulating member. When the second insulating member is folded to the side of the cover plate facing away from the first insulating cavity, the second insulating member and the cover plate form a second insulating cavity that accommodates the tabs of the electrode assembly.

[0009] In some embodiments, the first insulating member is provided with one of a fastening post and a fastening hole, and the second insulating member is provided with the other of a fastening post and a fastening hole. When the second insulating member is folded to the side of the cover plate facing away from the first insulating cavity, the fastening post is fastened to the fastening hole.

[0010] In some embodiments, the cover plate has a central flow hole, which is spaced apart from the perforated hole and the second insulating cavity. The central flow hole is used to connect to the central hole of the main body to allow electrolyte to flow. The central flow hole is concentrically arranged with the cover plate, the radius of the cover plate is R, and the radius of the central flow hole is R0, where 5%R≤R0≤50%R.

[0011] In some embodiments, the perforated hole is an arc-shaped hole extending circumferentially along the cover plate, and the perforated hole is concentrically arranged with the cover plate. The perforated hole has a first arc-shaped wall and a second arc-shaped wall arranged radially spaced along the cover plate.

[0012] In the radial direction of the cover plate, the distance from the first arc-shaped wall to the central axis of the cover plate is R1, and the distance from the second arc-shaped wall to the central axis of the cover plate is R2, where R0 < R1 < R2 < R;

[0013] 5%R≤R1<R; and / or, 5%R≤R2<R; and / or, 5%R≤R2-R1≤50%R; and / or, the center angle of the perforated hole is θ, 30°≤θ≤330°.

[0014] In some embodiments, when the second insulating member is unfolded relative to the cover plate, the second insulating member has an arcuate inner edge and an arcuate outer edge disposed radially along the cover plate;

[0015] The radius of the cover plate is R. In the radial direction of the cover plate, the distance from the inner edge of the arc to the central axis of the cover plate is R3, and the distance from the outer edge of the arc to the central axis of the cover plate is R4. 90%R≤R3<R, R<R4≤200%R.

[0016] In some embodiments, when the second insulating member is folded to the side of the cover plate opposite to the first insulating cavity, the orthographic projection of the second insulating member in the thickness direction of the cover plate covers the entire perforated hole.

[0017] In some embodiments, the first insulating member further includes a support post protruding from the cover plate on the side facing away from the first insulating cavity and used to abut against the end cap of the battery cell.

[0018] A battery cell, the battery cell comprising:

[0019] shell;

[0020] The insulating component as described in any of the foregoing embodiments is disposed within the housing; and

[0021] An electrode assembly is disposed within the housing and includes a main body and an electrode tab disposed at one end of the main body. The electrode tab includes a first segment and a second segment. The end of the main body with the electrode tab extends into the first insulating cavity. The first segment passes through the perforated hole. The second segment is located on the side of the cover plate facing away from the first insulating cavity and is partially located inside the second insulating cavity, with the remainder located outside the second insulating cavity.

[0022] In some embodiments, the dimension of the first insulating member is H in the axial direction of the housing, and the dimension of the main body is H0, where H ≤ H0.

[0023] A battery comprising a battery cell as described in the above embodiments.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The aforementioned insulating components, battery cells, and battery, with the insulating components cooperating with the main body and electrode tabs, can achieve insulation between the electrode tabs and the casing, as well as between the electrode tabs and the end caps. Compared to existing technologies, this method of cooperating the insulating components with the main body and electrode tabs is simple and easy to operate, and the insulating components are less prone to warping, deformation, or detachment, which helps improve the stability of the battery cell insulation and reduces the risk of battery cell short circuits. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a cylindrical battery cell with two insulating components in one embodiment of this application.

[0027] Figure 2 for Figure 1 The cross-sectional view of the cylindrical battery cell shown along the AA direction;

[0028] Figure 3 for Figure 2 An enlarged schematic diagram of a portion of structure B in the cylindrical battery cell shown;

[0029] Figure 4 for Figure 2 An enlarged schematic diagram of a local structure C in the cylindrical battery cell shown;

[0030] Figure 5 This is a schematic diagram of the structure of a cylindrical battery cell with an insulating component along the AA direction in another embodiment of this application;

[0031] Figure 6 for Figure 5 An enlarged schematic diagram of a local structure D in the cylindrical battery cell shown;

[0032] Figure 7This is a schematic diagram of the structure of the insulating assembly when the second insulating member is deployed in one embodiment of this application;

[0033] Figure 8 for Figure 7 A cross-sectional view of the insulating components along the EE direction;

[0034] Figure 9 for Figure 7 A schematic diagram of the insulation components from another perspective;

[0035] Figure 10 This is a schematic diagram of the structure of the insulating assembly when the second insulating member is folded in one embodiment of this application;

[0036] Figure 11 for Figure 10 A cross-sectional view of the insulating components along the FF direction;

[0037] Figure 12 This is a cross-sectional view of the insulating component and the electrode component after they are assembled in one embodiment of this application.

[0038] Icon labels:

[0039] 1000, battery cell;

[0040] 100. Insulation component; 200. Housing; 300. Electrode assembly;

[0041] 10. First insulating component; 11. Cover plate; 111. Hole; 111a. First arc-shaped wall; 111b. Second arc-shaped wall; 112. Central flow hole; 12. Side plate; 13. First insulating cavity; 14. Fastening post; 20. Second insulating component; 21. Fastening hole; 22. Arc-shaped inner edge; 23. Arc-shaped outer edge; 30. Second insulating cavity; 40. Support post;

[0042] 201. Housing; 202. End cap; 203. Pole post;

[0043] 301, Main body; 301a, Center hole; 302, Electrode; 302c, First section; 302d, Second section. Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0051] Battery cells are typically designed with tabs on the electrode assembly connected to terminals on the end cap, but insulation is required between the tabs and the end cap, and between the tabs and the casing.

[0052] The common insulation method is to place a plastic sheet on the side of the end cap facing the tab to achieve insulation between the tab and the end cap, and to attach insulating tape to the tab to achieve insulation between the tab and the shell.

[0053] However, the aforementioned plastic is prone to warping and deformation, and the insulating tape may peel off after long-term use. All of these will affect the stability of the battery cell insulation and increase the risk of short circuit in the battery cell.

[0054] Please see Figures 1 to 12 To alleviate the above problems, the applicant, after in-depth research, designed an insulating component 100 and a battery cell 1000. The battery cell 1000 includes a shell 200, an electrode assembly 300, and an insulating component 100. Both the electrode assembly 300 and the insulating component 100 are disposed inside the shell 200. The electrode assembly 300 is the main component for electrochemical reaction within the battery cell 1000. The insulating component 100 is used to insulate the tabs 302 of the electrode assembly 300 from the shell 200.

[0055] As an example, the battery cell 1000 can be a cylindrical battery cell, a square battery cell, or a battery cell 1000 of other shapes, which can be set according to requirements. For ease of explanation, the following embodiments will all use a cylindrical battery cell 1000 as an example for illustration.

[0056] The outer casing 200 includes a housing 201 and end caps 202 disposed at opposite ends of the housing 201. Taking a cylindrical battery cell 1000 as an example, only one of the positive and negative terminals is formed on one end cap 202 of the housing 200, and the other end cap 202 of the housing 200 forms the other of the positive and negative terminals. Taking a square battery cell 1000 as an example, the positive and negative terminals can be formed on the end caps 202 at both ends of the housing 200 respectively, or the positive and negative terminals can be formed on the same end cap 202 of the housing 200.

[0057] The electrode assembly 300 includes a main body 301 and an electrode tab 302 disposed at one end of the main body 301. The electrode tab 302 includes a first segment 302c and a second segment 302d. Specifically, the electrode tab 302 can be a positive electrode tab or a negative electrode tab. The electrode assembly 300 includes a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab can be disposed at the same end of the main body 301, or they can be disposed at opposite ends of the main body 301.

[0058] The insulating assembly 100 includes a first insulating member 10 and a second insulating member 20. The first insulating member 10 includes a cover plate 11 and a side plate 12. The side plate 12 is arranged circumferentially around the cover plate 11 and defines a first insulating cavity 13 for accommodating the main body 301. The cover plate 11 has an eccentrically arranged perforated hole 111 for leading out the tab 302. The second insulating member 20 is foldable or unfoldable relative to the first insulating member 10. When the second insulating member 20 is folded to the side of the cover plate 11 facing away from the first insulating cavity 13, the second insulating member 20 and the cover plate 11 surround and form a second insulating cavity 30 for accommodating the tab 302.

[0059] Specifically, the first insulating component 10 and the second insulating component 20 can be made of rubber, silicone, plastic, or other insulating materials. The first insulating component 10 and the second insulating component 20 can be integrally formed or separately formed, depending on the requirements.

[0060] The shape of the first insulating cavity 13 is adapted to the shape of the main body 301. For example, if the main body 301 is cylindrical, the first insulating cavity 13 is a cylindrical cavity; if the main body 301 is cuboid, the first insulating cavity 13 is a cuboid cavity. The main body 301 and the first insulating cavity 13 cooperate to reduce the risk of the insulating component 100 falling off.

[0061] The perforated hole 111 is eccentrically positioned, that is, the central axis of the cover plate 11 (e.g., Figure 9 (As shown by the straight line L) does not pass through the hollow hole 111.

[0062] When the electrode assembly 300 is engaged with the insulating assembly 100, at least one end of the main body 301 with an electrode tab 302 extends into the first insulating cavity 13. The first section 302c of the electrode tab 302 passes through the hollow hole 111, the second section 302d is located on the side of the cover plate 11 facing away from the first insulating cavity 13, and part of it is located inside the second insulating cavity 30, while the rest is located outside the second insulating cavity 30.

[0063] There may be one or two insulating components 100. When there is one insulating component 100 and the positive and negative tabs are located at the same end of the main body 301, the insulating component 100 cooperates with the positive and negative tabs and the main body 301. When there is one insulating component 100 and the positive and negative tabs are located at opposite ends of the main body 301, the insulating component 100 cooperates with one of the positive and negative tabs and the main body 301. When there are two insulating components 100 and the positive and negative tabs are located at opposite ends of the main body 301, one insulating component 100 cooperates with the positive tab and the main body 301, and the other insulating component 100 cooperates with the negative tab and the main body 301.

[0064] Taking a square battery cell 1000 as an example, with one insulating component 100 and the positive and negative tabs located at the same end of the main body 301. In this embodiment, there are at least two perforated holes 111, which are spaced apart circumferentially along the cover plate 11. The positive tab is led out from one of the perforated holes 111 aligned with it, and the negative tab is led out from the other perforated hole 111 aligned with it. The second insulating element 20 in the insulating assembly 100 can be one or at least two. If there is one second insulating element 20, it extends continuously along the circumference of the cover plate 11, and the second insulating cavity 30 formed by the second insulating element 20 and the cover plate 11 when folded can simultaneously accommodate part of the positive electrode tab and part of the negative electrode tab. If there are at least two second insulating elements 20, they extend continuously along the circumference of the cover plate 11 and correspond one-to-one with the perforated holes 111. The second insulating cavity 30 defined by the second insulating element 20 and the cover plate 11 accommodates the electrode tabs 302 led out from the perforated holes 111 corresponding to the second insulating element 20. Of course, the arrangement of the perforated holes 111 and the second insulating elements 20 is not limited to the above-mentioned methods and can also be in other ways.

[0065] During actual assembly, at least one end of the main body 301 with a positive electrode and a negative electrode extends into the first insulating cavity 13. The first sections 302c of the positive electrode and the negative electrode are respectively inserted through two hollow holes 111. The second sections 302d of the positive electrode and the negative electrode can be led out to the side of the cover plate 11 facing away from the first insulating cavity 13. The portions of the second sections 302d of the positive electrode and the negative electrode extend into the corresponding second insulating cavities 30. The remaining portions of the second sections 302d of the positive electrode and the negative electrode are respectively welded to the positive electrode post and the negative electrode post.

[0066] Taking a cylindrical battery cell 1000 as an example, with one insulating component 100 and positive and negative tabs respectively disposed at opposite ends of the main body 301. In this embodiment, there is at least one perforated hole 111, through which either the positive or negative tab is led out. The arrangement of the second insulating member 20 in the insulating component 100 is the same as described above, and therefore will not be repeated here.

[0067] In actual assembly, taking the positive electrode tab leading out through the hollow hole 111 as an example, at least one end of the main body 301 with the positive electrode tab extends into the first insulating cavity 13, the first section 302c of the positive electrode tab passes through the hollow hole 111, the second section 302d of the positive electrode tab can be led out to the side of the cover plate 11 facing away from the first insulating cavity 13, and a portion of the second section 302d of the positive electrode tab extends into the second insulating cavity 30, and the remaining portion of the second section 302d of the positive electrode tab is welded to the positive electrode post.

[0068] Taking a cylindrical battery cell 1000 as an example, with two insulating components 100 and positive and negative tabs respectively located at opposite ends of the main body 301, in this embodiment, one insulating component 100 is engaged with the positive tab, and the other insulating component 100 is engaged with the negative tab. The engagement method is the same as that when the battery cell 1000 is a cylindrical battery cell 1000 and there is only one insulating component 100, so it will not be described again here.

[0069] In actual operation, the second insulating member 20 unfolds relative to the first insulating member 10 to prevent interference with the positive electrode tab being led out from the perforated portion. At least one end of the main body 301 with the positive electrode tab extends into the first insulating cavity 13 to form insulation between the main body 301 and the electrode tab 302 and the housing 201. The positive electrode tab is led out through the perforated hole 111 and is folded to form a first segment 302c and a second segment 302d. The first segment 302c remains in the perforated hole 111, and the second segment 302d is bent relative to the first segment 302c and attached to the cover plate 11. Then, the second insulating member 20 is folded to the side of the cover plate 11 facing away from the first insulating cavity 13, and together with the cover plate 11, forms a second insulating cavity 30 to shield part of the second section 302d, thereby achieving insulation between the tab 302 and the end cap 202. The part of the second section 302d that is not shielded by the second insulating member 20, that is, the part of the second section 302d that extends out of the second insulating cavity 30, is welded to the positive terminal to achieve electrical connection between the positive terminal and the positive tab.

[0070] Therefore, by setting the aforementioned insulating component 100, and with the insulating component 100 cooperating with the main body 301 and the tab 302, insulation can be achieved between the tab 302 and the housing 201, and between the tab 302 and the end cap 202. Compared with the prior art, this method of cooperating the insulating component 100 with the main body 301 and the tab 302 is simple and easy to operate, and the insulating component 100 is not easy to lift, deform, or fall off, which helps to improve the insulation stability of the battery cell 1000 and reduces the risk of short circuit in the battery cell 1000. In addition, the tab 302 is directly welded to the terminal post 203, eliminating the need for a current collector and increasing the internal space utilization efficiency of the battery cell 1000.

[0071] Please see Figure 2 and Figure 8 In some embodiments, the dimension of the first insulating member 10 in the axial direction of the housing 200 is H, and the dimension of the main body 301 is H0, where H ≤ H0, and preferably, H ≤ 30% H0. As an example, H can be, but is not limited to, H0, 30% H0, etc. The larger H is, the more the main body 301 is wrapped, the lower the risk of detachment, and the better the insulation effect, but more material is required. Therefore, considering both insulation effect and cost, H ≤ 30% H0 can be set.

[0072] Please see Figure 7 and Figure 9 In some embodiments, the first insulating member 10 is provided with one of a fastening post 14 and a fastening hole 21, and the second insulating member 20 is provided with the other of a fastening post 14 and a fastening hole 21. When the second insulating member 20 is folded to the side of the cover plate 11 facing away from the first insulating cavity 13, the fastening post 14 is fastened to the fastening hole 21.

[0073] For example, the first insulating member 10 includes a fastening post 14, which protrudes from the surface of the cover plate 11 facing away from the first insulating cavity 13, and the second insulating member 20 has a fastening hole 21.

[0074] The fastening post 14 and the fastening hole 21 can each be set to one or more, and the specific number is not limited here.

[0075] By setting the fastening post 14 and the fastening hole 21, the second insulating component 20 can be fixed on the back of the cover plate 11 facing away from the first insulating cavity 13, and the electrode tab 302 and the end cap 202 are insulated, with excellent insulation stability.

[0076] Under actual battery operating conditions, the battery may vibrate, potentially causing the tab 302 to be damaged by being pulled by the main body 301 or the terminal post 203. To mitigate this problem, the second insulating member 20 can be configured to press against the tab 302 when the cover plate 11 is folded to the side facing away from the first insulating cavity 13, thus clamping the tab 302 between the second insulating member 20 and the cover plate 11, thereby reducing the risk of the tab 302 being pulled.

[0077] Please see Figures 7 to 11 In some embodiments, the cover plate 11 has a central flow hole 112, which is spaced apart from the hollow hole 111 and the second insulating cavity 30. The central flow hole 112 is used to connect to the central hole 301a of the main body 301 to allow electrolyte to flow. The central flow hole 112 is concentrically arranged with the cover plate 11. The radius of the cover plate 11 is R, and the radius of the central flow hole 112 is R0, where 5%R≤R0≤50%R.

[0078] The central flow hole 112 and the cover plate 11 are concentrically arranged, that is, the central flow hole 112 is a round hole and the cover plate 11 is a circular plate, and the centers of the two coincide.

[0079] The central flow hole 112 is also coaxially disposed with the central hole 301a of the main body 301 and is used to connect with the central hole 301a of the main body 301. In this way, the electrolyte can convect within the central hole 301a and outside the main body 301 through the central flow hole 112, ensuring that the electrolyte can fully wet the main body 301.

[0080] Furthermore, the portion of the tab 302 extending to the central flow hole 112 is welded to the pole post 203. If the radius of the central flow hole 112 is too small, the area of ​​the tab 302 extending to the central flow hole 112 will also be small, which is not conducive to welding the tab 302 to the pole post 203, and the welding area is small, which cannot meet the current flow requirements. If the radius of the central flow hole 112 is too large, it occupies too much area, which makes it impossible to reasonably arrange the perforated hole 111. By designing 5%R≤R0≤50%R, not only can the central flow hole 112 and the perforated hole 111 be reasonably arranged on the cover plate 11, but they also have a suitable welding area, which facilitates meeting the current flow requirements.

[0081] Furthermore, the portion of the tab 302 extending to the central flow hole 112 is welded to the pole post 203. If the radius of the central flow hole 112 is too small, the area of ​​the portion of the tab 302 extending to the central flow hole 112 will also be small, which is not conducive to welding the tab 302 to the pole post 203, and the welding area is small, failing to meet the current flow requirements. If the radius of the central flow hole 112 is too large, and the area it occupies is too large, then the perforated hole 111 cannot be reasonably arranged. By designing 5%R≤R0≤50%R, not only can the central flow hole 112 and the perforated hole 111 be reasonably arranged on the cover plate 11, but they also have a suitable welding area, making it easy to meet the current flow requirements.

[0082] In some embodiments, the perforated hole 111 is an arc-shaped hole extending circumferentially along the cover plate 11, and the perforated hole 111 is concentrically arranged with the cover plate 11. The perforated hole 111 has a first arc-shaped wall 111a and a second arc-shaped wall 111b arranged radially spaced along the cover plate 11. In the radial direction of the cover plate 11, the distance from the first arc-shaped wall 111a to the central axis of the cover plate 11 is R1, and the distance from the second arc-shaped wall 111b to the central axis of the cover plate 11 is R2, where R0 < R1 < R2 < R.

[0083] 5%R≤R1<R; and / or, 5%R≤R2<R; and / or, 5%R≤R2-R1≤50%R; and / or, the center angle of the perforated hole 111 is θ, 30°≤θ≤330°.

[0084] The main function of the perforated hole 111 is to concentrate the electrode tab 302 through which it passes and leads to the central flow hole 112, so that the electrode tab 302 can be welded to the electrode post 203. If R1 and R2 are too small, the perforated hole 111 will be biased towards the center of the cover plate 11, affecting the layout of the central flow hole 112. If R1 and R2 are too large, the perforated hole 111 will be far off from the center, and the electrode tab 302 will need to be longer to be led out of the perforated hole 111, folded, and extended to the central flow hole 112, resulting in material waste. By designing R0 < R1 < R2 < R, and 5%R ≤ R1 < R, and / or 5%R ≤ R2 < R, and / or 5%R ≤ R2 - R1 ≤ 50%R, material waste can be reduced while ensuring a reasonable layout of the central flow hole 112 and the perforated hole 111.

[0085] Furthermore, if R2-R1 is too small, it means the radial width of the perforated hole 111 in the cover plate 11 is small, and if θ is too small, it means the circumferential length of the perforated hole 111 in the cover plate 11 is small. Both of these will result in a small operating space, making it inconvenient to lead out the electrode tab 302. If R2-R1 is too large, it means the radial width of the perforated hole 111 in the cover plate 11 is too large, and if θ is too large, it means the circumferential length of the perforated hole 111 in the cover plate 11 is too large. Both of these will affect the strength of the cover plate 11. By designing 5%R≤R2-R1≤50%R and / or 30°≤θ≤330°, the electrode tab 302 can be easily led out while the cover plate 11 can maintain its mechanical strength and have a longer service life.

[0086] Please see Figures 7 to 9 In some embodiments, when the second insulating member 20 is unfolded relative to the cover plate 11, the second insulating member 20 has an arc-shaped inner edge 22 and an arc-shaped outer edge 23 arranged radially along the cover plate 11; the radius of the cover plate 11 is R, and in the radial direction of the cover plate 11, the distance from the arc-shaped inner edge 22 to the central axis of the cover plate 11 is R3, and the distance from the arc-shaped outer edge 23 to the central axis of the cover plate 11 is R4, where 90%R≤R3<R, and R<R4≤200%R. Under this design, when the second insulating member 20 is folded to the side of the cover plate 11 facing away from the first insulating cavity 13, it can block the tab 302 as much as possible, improve the stability of the insulation between the tab 302 and the cover plate 11, and reduce material waste.

[0087] Please see Figure 11 and Figure 12 In some embodiments, when the second insulating member 20 is folded to the side of the cover plate 11 facing away from the first insulating cavity 13, the orthographic projection of the second insulating member 20 in the thickness direction of the cover plate 11 completely covers the perforated hole 111. Since the second segment 302d of the tab 302 is folded relative to the first segment 302c from the perforated hole 111, the orthographic projection of the first insulating member 10 in the thickness direction of the cover plate 11 completely covers the perforated hole 111. Therefore, the second segment 302d can be folded so that the second segment 302d is close to the cover plate 11, reducing the risk of the tab 302 loosening in the second insulating cavity 30. In this embodiment, when the second insulating member 20 is unfolded, the perforated hole 111 is exposed to facilitate the tab 302 being led out. When the second insulating member 20 is folded, it can be folded from the root where the second segment 302d connects to the first segment 302c to prevent the tab 302 from loosening and being pulled by the pole post 203.

[0088] Of course, in some other embodiments, when the second insulating member 20 is folded to the side of the cover plate 11 facing away from the first insulating cavity 13, the orthographic projection of the second insulating member 20 in the thickness direction of the cover plate 11 may cover part of the hollow hole 111, or the orthographic projection of the second insulating member 20 in the thickness direction of the cover plate 11 may be located outside the hollow hole 111.

[0089] Please see Figures 7 to 12 In some embodiments, the first insulating member 10 further includes a support post 40, which protrudes from the cover plate 11 on the side facing away from the first insulating cavity 13 and is used to abut against the end cap 202 of the battery cell 1000. The number of support posts 40 is not limited; there can be one or more. If there are multiple support posts 40, they can extend circumferentially along the cover plate 11, or they can be arranged in a matrix, etc. The specific arrangement is not limited here. The contact between the support post 40 and the end cap 202 can further enhance the stability of the insulating assembly 100 installation, eliminate the need for the lower plastic on the end cap 202, optimize the structure of the end cap 202, and maintain the stability of insulation over a long period, thus improving battery safety performance. Furthermore, when the support post 40 supports the end cap 202, the gap between the cover plate 11 and the end cap 202 can store electrolyte, increasing the electrolyte storage capacity of the battery cell 1000 and preventing electrolyte shortage during later use.

[0090] This application also provides a battery, which includes the battery cell 1000 described in any of the above embodiments. The battery in this application has the effects of any of the above embodiments, and therefore will not be described again here.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An insulating component, characterized in that, The insulating component includes: The first insulating member (10) includes a cover plate (11) and a side plate (12). The side plate (12) is arranged around the cover plate (11) in the circumferential direction and defines a first insulating cavity (13) with the cover plate (11) to form a main body (301) for accommodating the electrode assembly (300). The cover plate (11) has an eccentrically arranged hollow hole (111) for leading out the tab (302). The second insulating member (20) is foldable or unfoldable relative to the first insulating member (10). When the second insulating member (20) is folded to the side of the cover plate (11) facing away from the first insulating cavity (13), the second insulating member (20) and the cover plate (11) surround the second insulating cavity (30) to form the electrode tab (302) of the electrode assembly (300).

2. The insulating component according to claim 1, characterized in that, The first insulating member (10) is provided with one of a fastening post (14) and a fastening hole (21), and the second insulating member (20) is provided with the other of a fastening post (14) and a fastening hole (21). When the second insulating member (20) is folded to the side of the cover plate (11) facing away from the first insulating cavity (13), the fastening post (14) is fastened to the fastening hole (21).

3. The insulating component according to claim 1, characterized in that, The cover plate (11) has a central flow hole (112), which is spaced apart from the hollow hole (111) and the second insulating cavity (30). The central flow hole (112) is used to connect to the central hole (301a) of the main body (301) to allow electrolyte to flow. The central flow hole (112) is concentrically arranged with the cover plate (11). The radius of the cover plate (11) is R, and the radius of the central flow hole (112) is R0, where 5%R≤R0≤50%R.

4. The insulating component according to claim 3, characterized in that, The perforated hole (111) is an arc-shaped hole extending circumferentially along the cover plate (11), and the perforated hole (111) is concentrically arranged with the cover plate (11). The perforated hole (111) has a first arc-shaped wall (111a) and a second arc-shaped wall (111b) arranged radially spaced along the cover plate (11). In the radial direction of the cover plate (11), the distance from the first arc-shaped wall (111a) to the central axis of the cover plate (11) is R1, and the distance from the second arc-shaped wall (111b) to the central axis of the cover plate (11) is R2, where R0 < R1 < R2 < R; 5%R≤R1<R; and / or, 5%R≤R2<R; and / or, 5%R≤R2-R1≤50%R; and / or, the center angle of the perforated hole (111) is θ, 30°≤θ≤330°.

5. The insulating component according to claim 1, characterized in that, When the second insulating member (20) is unfolded relative to the cover plate (11), the second insulating member (20) has an arcuate inner edge (22) and an arcuate outer edge (23) arranged radially along the cover plate (11); The radius of the cover plate (11) is R. In the radial direction of the cover plate (11), the distance from the inner arc edge (22) to the central axis of the cover plate (11) is R3, and the distance from the outer arc edge (23) to the central axis of the cover plate (11) is R4. 90%R≤R3<R, R<R4≤200%R.

6. The insulating component according to claim 1, characterized in that, When the second insulating member (20) is folded to the side of the cover plate (11) facing away from the first insulating cavity (13), the orthographic projection of the second insulating member (20) in the thickness direction of the cover plate (11) covers the entire hollow hole (111).

7. The insulating component according to claim 1, characterized in that, The first insulating member (10) further includes a support post (40), which protrudes from the cover plate (11) on the side facing away from the first insulating cavity (13) and is used to abut against the end cap (202) of the battery cell.

8. A single battery cell, characterized in that, The battery cell includes: Outer shell (200); The insulating component as described in any one of claims 1 to 7 is disposed within the housing (200); and An electrode assembly (300) is disposed within the housing (200) and includes a main body (301) and an electrode tab (302) disposed at one end of the main body (301). The electrode tab (302) includes a first segment (302c) and a second segment (302d). At least one end of the main body (301) with the electrode tab (302) extends into the first insulating cavity (13). The first segment (302c) passes through the perforated hole (111). The second segment (302d) is located on the side of the cover plate (11) facing away from the first insulating cavity (13), and part of it is located inside the second insulating cavity (30), while the rest is located outside the second insulating cavity (30).

9. The battery cell according to claim 8, characterized in that, In the axial direction of the outer casing (200), the first insulating member (10) has a dimension of H, and the main body (301) has a dimension of H0, where H ≤ H0.

10. A battery, characterized in that, Includes the battery cell as described in claim 8 or 9 above.

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