Insulation assembly for coating electrode assembly and battery cell

Abstract

The utility model provides an insulation assembly for coating an electrode assembly and a battery cell, the electrode assembly comprises a body and tabs extending from the top surface of the body, the tabs are stacked along a first direction, the insulation assembly comprises a side insulation part and a top insulation part extending from the side insulation part to the top surface of the body, and the side insulation part and the top insulation part are stacked along the first direction. And the projection of the top insulating part on the top surface and the projection of the tab on the top surface are at least partially not overlapped in the first direction. The top insulating part can be arranged on at least one side of the tab in the stacking direction of the tab, so that the tab can be limited in the stacking direction of the tab, the tab can be kept in a stretching state under the limiting action of the top insulating part, redundancy caused by deformation of the tab is avoided, and the reliability of the tab is improved. And the position of the tab can be fixed through the limiting effect of the top insulating part, so that the tab is prevented from being inserted into the electrode assembly, and the condition of short circuit of the battery cell is further avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an insulating component for wrapping an electrode assembly and an electric core. Background Art

[0002] With the rise of new energy vehicles and electrochemical energy storage stations, the development of lithium-ion batteries has attracted much attention. However, lithium-ion batteries frequently experience accidents during use, such as spontaneous combustion and even explosion caused by short circuits and thermal runaway of the electric core, which bring huge losses to society and the public. Therefore, it is crucial to improve the safety performance of lithium-ion batteries. Summary of the Utility Model

[0003] In view of this, the purpose of the present utility model is to provide an insulating component for wrapping an electrode assembly and an electric core to solve the problem of poor safety performance of the battery.

[0004] Based on the above purpose, the present utility model provides an insulating component for wrapping an electrode assembly. The electrode assembly includes a body and an ear tab extending from the top surface of the body. The ear tabs are stacked in a first direction. The insulating component includes a side insulating member and a top insulating member extending from the side insulating member to the top surface of the body. The projection of the top insulating member on the top surface does not at least partially coincide with the projection of the ear tab on the top surface in the first direction.

[0005] Further, the top insulating member includes a first top insulating member and a second top insulating member arranged at intervals, and a gap between the first top insulating member and the second top insulating member allows the ear tab to extend out.

[0006] Further, the first top insulating member and the second top insulating member are in contact with the ear tab.

[0007] Further, the ear tab includes a first ear tab and a second ear tab in the first direction. The top insulating member further includes a third top insulating member arranged between the first top insulating member and the second top insulating member. A gap between the first top insulating member and the third top insulating member allows the first ear tab to extend out, and a gap between the second top insulating member and the third top insulating member allows the second ear tab to extend out.

[0008] Further, the first top insulating member and the third top insulating member are respectively in contact with two sides of the first ear tab, and the second top insulating member and the third top insulating member are respectively in contact with two sides of the second ear tab.

[0009] Further, the thickness of the top insulating member is 0.01 to 2 millimeters.

[0010] Further, the insulation assembly further includes a bottom insulation member extending from the side insulation member to the bottom surface of the body, and the bottom insulation member covers the bottom surface of the body.

[0011] Further, there are two side insulation members. The body includes two first side surfaces arranged oppositely, and the first side surfaces are parallel to the first direction. The two side insulation members are respectively used to cover the two first side surfaces, and the two side insulation members respectively extend to the bottom surface to form a first bottom insulation member and a second bottom insulation member. The sum of the projections of the first bottom insulation member and the second bottom insulation member on the bottom surface covers the bottom surface.

[0012] Further, the insulation assembly further includes two first insulation members arranged oppositely, and the body further includes two second side surfaces arranged oppositely. The two first insulation members respectively cover the two second side surfaces.

[0013] Further, the insulation assembly further includes a connecting member extending from the side insulation member to the side surface of the body, and the connecting member is connected to the first insulation member; and / or, a second insulation member is provided between the two first insulation members, and the second insulation member covers the bottom surface of the body.

[0014] Based on the same inventive concept, the present application further provides an electric core, including an insulation assembly for coating an electrode assembly, an electrode assembly, a housing, and a top cover as described above. The housing and the top cover enclose a sealed cavity. The insulation assembly is located in the cavity and coats the electrode assembly, and the tab of the electrode assembly is connected to the top cover.

[0015] As can be seen from the above, the present utility model provides an insulation assembly and an electric core for coating an electrode assembly. The insulation assembly includes a side insulation member and a top insulation member. The top insulation member extends from the side insulation member to the top surface of the body of the electrode assembly. There is a non - overlapping part in the first direction between the projection of the top insulation member on the top surface of the body and the projection of the tab of the electrode assembly on the top surface of the body. That is, the top insulation member can be arranged on at least one side of the tab along the stacking direction of the tabs, so as to limit the tabs in the stacking direction of the tabs, enabling the tabs to maintain an extended state under the limiting action of the top insulation member, avoiding deformation and redundancy of the tabs, and the limiting action of the top insulation member can fix the position of the tabs, preventing the tabs from being inserted into the electrode assembly, thereby avoiding the occurrence of short - circuit of the electric core and improving the safety performance of the electric core, and further improving the safety performance of the battery. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic side view structure diagram of the insulating component covering the electrode component in the embodiment of the present invention;

[0018] Figure 2 It is a schematic three-dimensional structure diagram of the electrode component in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structure diagram of the side insulating member, top insulating member and bottom insulating member in the embodiment of the present invention;

[0020] Figure 4 It is a schematic front view structure diagram of the insulating component covering the electrode component in the embodiment of the present invention;

[0021] Figure 5 It is an exploded view of the insulating component covering the electrode component in the embodiment of the present invention;

[0022] Figure 6 It is a schematic structure diagram of the first insulating member and the second insulating member in the embodiment of the present invention;

[0023] Figure 7 It is a schematic internal bottom view structure diagram of the battery cell in the embodiment of the present invention.

[0024] In the figure: 10, electrode component; 11, body; 111, first side; 112, second side; 12, tab; 121, first tab; 122, second tab;

[0025] 20, side insulating member; 30, top insulating member; 31, first top insulating member; 32, second top insulating member; 33, third top insulating member; 34, gap; 40, bottom insulating member; 41, first bottom insulating member; 42, second bottom insulating member; 50, first insulating member; 60, connecting member; 70, second insulating member; 80, top cover; 81, terminal post. Detailed implementation manners

[0026] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the following will further describe the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present utility model should have the ordinary meanings understood by those with general skills in the field to which this application belongs. The "first", "second" and similar terms used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] In recent years, with the rise of new energy vehicles and electrochemical energy storage stations, the development of lithium-ion batteries has attracted much attention. However, accidents frequently occur during the use of lithium-ion batteries, such as spontaneous combustion and fire caused by short circuits and thermal runaway of battery cells, and even explosions, which have brought huge losses to society and the public. Therefore, it is crucial to improve the safety performance of lithium-ion battery cells, and corresponding improvements need to be made during the assembly of the battery cells.

[0029] During the current assembly process of battery cells, two or four electrode assemblies are combined to form a battery cell. The ear tabs of the same polarity in the two or four electrode assemblies are all connected to the inner sides of the pole posts of the same polarity on the top cover. The two electrode assemblies are fixedly connected by tape, and then they are put into a shell and sealed to form a battery cell. In this assembly process, it is very easy for the ear tabs to be deformed and inserted into the electrode assemblies, resulting in short circuits of the battery cells.

[0030] Based on this, the present application proposes an insulating component and a battery cell for coating an electrode assembly. By providing a top insulating member on the top surface of the ear tab provided on the body of the electrode assembly, the top insulating member exerts a limiting effect on the ear tab. Under the limiting effect of the top insulating member, the ear tab can maintain an extended state, thereby avoiding the redundancy caused by the deformation of the ear tab and generating excessive heat. Moreover, the limiting effect of the top insulating member can fix the position of the ear tab, avoiding the ear tab from being inserted into the electrode assembly and causing a short circuit of the battery cell, improving the safety performance of the battery cell.

[0031] The following will, with reference to the accompanying drawings, through specific embodiments, elaborate on one or more embodiments of the present application in detail. Figure 1 shows a side view structural schematic diagram of the insulating component coating the electrode assembly, Figure 2 shows a three-dimensional structural schematic diagram of the electrode assembly, as Figure 1 and Figure 2As shown in the figure, the present application provides an insulating component for wrapping an electrode assembly. The electrode assembly 10 includes a body 11 and a tab 12 extending from the top surface of the body 11. The tabs 12 are stacked in a first direction. The insulating component includes a side insulating member 20 and a top insulating member 30 extending from the side insulating member 20 to the top surface of the body 11. The projection of the top insulating member 30 on the top surface does not coincide with the projection of the tab 12 on the top surface at least partially in the first direction.

[0032] Specifically, the insulating component wraps the electrode assembly 10, and the electrode assembly 10 is a component that undergoes an electrochemical reaction in a battery cell. The electrode assembly 10 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly 10, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the tabs 12. The tabs 12 of the positive electrode and the tabs 12 of the negative electrode can be located at one end of the main body together. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs 12 are connected to the electrode terminals to form a current loop.

[0033] The tab 12 is formed by stacking multiple portions without active materials, and the stacking direction is as shown by a in Figure 2 . Each layer of the stack has a fixed end and a free end. Multiple fixed ends extend side by side on the body 11, and multiple free ends gather to form the connection end of the tab. This connection end is used to connect to the pole post. During the use or assembly of the battery cell, the tab 12 may be bent or deformed due to external forces or its own gravity, and may even insert into the body 11 of the electrode assembly 10, resulting in a short circuit of the battery cell and affecting the safety performance of the battery cell.

[0034] Specifically, the top surface is the surface where the tab 12 extends from the body 11. When the tab 12 extends from the side surface of the body 11, this side surface is set as the top surface of the body 11.

[0035] The projection of the top insulating member 30 on the top surface does not coincide with the projection of the tab 12 on the top surface at least partially in the first direction, which means that the projection of the top insulating member 30 on the top surface does not coincide with the projection of the tab 12 on the top surface completely in the first direction. At this time, the top insulating member 30 is arranged at an interval from the tab, and the top insulating member 30 completely covers the top surface. Or, the projection of the top insulating member 30 on the top surface coincides with the projection of the tab 12 on the top surface partially and does not coincide partially in the first direction. At this time, a part of the top insulating member 30 covers the top surface, and the other part covers the fixed end of the tab 12. At this time, the top insulating member 30 can be in direct contact or abut against the connection end of the tab 12, or there can be a small gap 34 between the top insulating member 30 and the connection end of the tab 12.

[0036] The projection of the top insulating member 30 on the top surface and the projection of the tab 12 on the top surface do not coincide at least partially in the first direction, so that the top insulating member 30 can be arranged on at least one side of the tab 12 along the stacking direction of the tab 12 to limit the tab 12 in the stacking direction of the tab 12. Moreover, the projection of the top insulating member 30 on the top surface and the projection of the tab 12 on the top surface do not completely coincide in the first direction, so as to ensure that at least part of the top insulating member 30 is used to cover the top surface to improve the stability of the top insulating member 30.

[0037] On the one hand, the side insulating member 20 is used to support the top insulating member, and on the other hand, it is used to cover the side surface of the top edge of the main body 11 parallel to the first direction to insulate and cover the side surface of the main body 11.

[0038] In this embodiment, the top insulating member 30 is arranged on at least one side of the tab 12 along the stacking direction of the tab 12 to limit the tab 12 in the stacking direction of the tab 12, so that the tab 12 can maintain an extended state under the limiting action of the top insulating member 30, avoiding deformation and redundancy of the tab 12. Moreover, the limiting action of the top insulating member 30 can fix the position of the tab 12, preventing the tab 12 from being inserted into the electrode assembly 10, thereby avoiding the occurrence of short circuit of the battery cell and improving the safety performance of the battery cell and further enhancing the safety performance of the battery.

[0039] In some embodiments, as shown in Figure 1 , the top insulating member 30 includes a first top insulating member 31 and a second top insulating member 32 arranged at intervals, and a gap 34 between the first top insulating member 31 and the second top insulating member 32 allows the tab 12 to extend out.

[0040] Specifically, the free end of the tab 12 extends out from the gap 34 between the first top insulating member 31 and the second top insulating member 32. Thus, the first top insulating member 31 and the second top insulating member 32 are respectively located on two outer sides of the tab 12 in the first direction to apply a limiting action on the stacking structure of the tab 12 from both sides in the stacking direction of the tab 12, improving the limiting effect, ensuring that the tab 12 maintains an extended state, thereby avoiding deformation and redundancy of the tab 12 and generating excessive heat. Moreover, it prevents the tab 12 from being inserted into the electrode assembly 10 and the occurrence of short circuit of the battery cell, improving the safety performance of the battery cell.

[0041] In some embodiments, as shown in Figure 1 and Figure 2 , the first top insulating member 31 and the second top insulating member 32 are in contact with the tab 12.

[0042] Specifically, the tab 12 has two outer sides in the first direction. The first top insulating member 31 and the second top insulating member 32 are respectively located on the two outer sides and are respectively in contact with the tab 12 to apply a contact force along the first direction to both sides of the tab 12 simultaneously. This contact force can further ensure the limiting effect of the top insulating member 3 on the tab 12 and prevent excessive displacement of the tab 12, so as to avoid the tab 12 being inserted into the electrode assembly 10.

[0043] It should be noted that in this embodiment, the tab 12 can be a single tab 12 arranged along the first direction. At this time, the first top insulating member 31 and the second top insulating member 32 are respectively arranged on both sides of the tab 12 along the first direction to limit the tab 12 from both sides.

[0044] The tab 12 can also be two tabs 12 arranged along the first direction, namely the first tab 121 and the second tab 122, and their stacking directions are the same. The inventor found that since the first tab 121 and the second tab 122 are prone to displacement, the positions where the tab 12 is inserted are usually on the outer sides of the first tab 121 and the second tab 122, that is, the side of the first tab 121 away from the second tab 122 and the side of the second tab 122 away from the first tab 121.

[0045] Based on this, in the present application, the first top insulating member 31 is located on the side of the first tab 121 away from the second tab 122, and the second top insulating member 32 is located on the side of the second tab 122 away from the first tab 121, so that the first top insulating member 31 and the second top insulating member 32 simultaneously apply a limiting effect and a contact effect to the two tabs 12 in the first direction, ensuring that the two tabs 12 in the first direction can be limited simultaneously.

[0046] It should be noted that the tab 12 can also be multiple tabs 12 arranged along the first direction. The first top insulating member 31 and the second top insulating member 32 can be respectively located on the outermost sides of the multiple tabs 12, and the setting is similar to that of the two tabs 12, which will not be elaborated here.

[0047] In some embodiments, Figure 3 shows a schematic structural diagram of the side insulating member, the top insulating member, and the bottom insulating member. Continuing as Figure 2 and Figure 3 shown, the tab 12 includes a first tab 121 and a second tab 122 in the first direction. The top insulating member 30 further includes a third top insulating member 33. The third top insulating member 33 is arranged between the first top insulating member 31 and the second top insulating member 32. A gap 34 between the first top insulating member 31 and the third top insulating member 33 allows the first tab 121 to extend out, and a gap 34 between the second top insulating member 32 and the third top insulating member 33 allows the second tab 122 to extend out.

[0048] Specifically, the first tab 121 and the second tab 122 are a set of tabs 12 of the same polarity. This set of tabs can be positive tabs or negative tabs. The top surface of the body 11 includes two sets of tabs 12, one set of tabs 12 being positive tabs and the other set of tabs 12 being negative tabs. These two sets of tabs 12 are arranged in parallel and have the same stacking direction.

[0049] Specifically, the first top insulating member 31 is located on the side of the first tab 121 away from the second tab 122, the third top insulating member 33 is located between the first tab 121 and the second tab 122, and the second top insulating member 32 is located on the side of the second tab 122 away from the first tab 121. The first top insulating member 31, the second top insulating member 32, and the third top insulating member 33 jointly act in the first direction to apply a limiting effect on both sides of the first tab 121 and the second tab 122, avoiding redundancy and interpolation of the portions of the first tab 121 and the second tab 122 close to the body 11 of the electrode assembly 10, which is beneficial to improving the safety performance of the battery cell.

[0050] In some embodiments, continuing as Figure 1 and Figure 3 shown, the first top insulating member 31 and the third top insulating member 33 are in contact with both sides of the first tab 121, and the second top insulating member 32 and the third top insulating member 33 are in contact with both sides of the second tab 122 respectively.

[0051] Specifically, the third top insulating member 33 is located between the free ends of the first tab 121 and the second tab 122. The third top insulating member 33 is in contact with both the first tab 121 and the second tab 122. The width of the third top insulating member 33 (i.e., the length in the first direction) is adapted to the distance between the free ends of the first tab 121 and the second tab 122, so that both sides of the third top insulating member 33 can limit the first tab 121 and the second tab 122 simultaneously.

[0052] The first top insulating member 31 is located on the side of the first tab 121 away from the second tab 122. Its width (i.e., the length in the first direction) is adapted to the distance between the free end of the first tab 121 and the outer edge of the top surface in the first direction. The first top insulating member 31 is in contact with the outer side of the first tab 121 away from the second tab 122 to limit the first tab 121 from the outside.

[0053] The second top insulating member 32 is located on the side of the second tab 122 away from the first tab 121. Its width (i.e., the length in the first direction) is adapted to the distance between the free end of the second tab 122 and the outer edge of the top surface in the first direction. The second top insulating member 32 is in contact with the outer side of the second tab 122 away from the first tab 121 to limit the second tab 122 from the outside.

[0054] In this embodiment, the first top insulating member 31 and the third top insulating member 33 are in contact with both sides of the first tab 121 in the first direction, and the second top insulating member 32 and the third top insulating member 33 are in contact with both sides of the second tab 122 in the first direction. In this way, both sides of the first tab 121 and the second tab 122 are limited, so that the positions of the first tab 121 and the second tab 122 are fixed, avoiding the situation where the tabs 12 are inserted due to the offset of the positions of the first tab 121 and the second tab 122. At the same time, the first tab 121 can be further in an extended state under the action of the abutting force, and the second tab 122 can be further in an extended state under the action of the abutting force, avoiding the redundancy of the first tab 121 and the second tab 122, and further avoiding the occurrence of thermal runaway due to heat accumulation, which is beneficial to improving the safety performance of the battery cell.

[0055] It should be noted that the first top insulating member 31, the second top insulating member 32 and the third top insulating member 33 can also be connected to the first tab 121 and the second tab 122 by adhesive to achieve a more stable abutment.

[0056] In some embodiments, the thickness of the top insulating member 30 is 0.01 to 2 millimeters.

[0057] Specifically, the top insulating member 30 has a limiting effect and an abutting effect on the tab 12. The thickness of the top insulating member 30 is directly related to its limiting effect and abutting effect. If the thickness of the top insulating member 30 is too large, the excessive abutting effect on the tab 12 may cause the tab 12 to break or affect the service life of the tab 12. If the thickness of the top insulating member 30 is too small, its abutting effect and limiting effect are almost non-existent. The thickness of the top insulating member 30 is set to 0.01 to 2 millimeters, so that it can be flexibly adjusted according to the characteristics of the tab 12 it acts on, and better play its role on the tab 12.

[0058] In some embodiments, Figure 4 shows a front view structural schematic diagram of the insulating component covering the electrode component. Continuing as Figure 3 and Figure 4 shown, the insulating component further includes a bottom insulating member 40 extending from the side insulating member 20 to the bottom surface of the body 11, and the bottom insulating member 40 covers the bottom surface of the body 11.

[0059] Specifically, the bottom insulating member 40 is used to cover the bottom surface of the body 11, and it is integrally connected with the side insulating member 20, which can ensure the covering effect on the body 11, and further ensure the insulating effect of the body 11 of the electrode component 10.

[0060] A plurality of small holes are uniformly arranged on the bottom insulating member 40 to enable the liquid cooling plate located at the bottom of the body 11 of the electrode component 10 to dissipate heat quickly.

[0061] In some embodiments,Figure 5 An exploded view of the insulating component covering the electrode component is shown. Continuing as Figure 2 , Figure 3 and Figure 5 shown, there are two side insulating members 20. The body 11 includes two first side surfaces 111 arranged oppositely. The first side surfaces 111 are parallel to the first direction. The two side insulating members 20 are respectively used to cover the two first side surfaces 111. The two side insulating members 20 respectively extend to the bottom surface to form a first bottom insulating member 41 and a second insulating member 42. The sum of the projections of the first bottom insulating member 41 and the second bottom insulating member 42 on the bottom surface covers the bottom surface.

[0062] Specifically, the body 11 may be a cuboid structure. Its side surfaces include four side surfaces, two of which are arranged oppositely. The tabs 12 are located on the top surface. The tabs 12 are stacked along the first direction. The first direction is parallel to two opposite sides of the top surface. Then the two opposite side surfaces corresponding to these two opposite sides are the two first side surfaces 111 parallel to the first direction.

[0063] There are two side insulating members 20, and they respectively cover the two first side surfaces 111. Then there are also two sets of top insulating members 30 extended from the side insulating members 20 and bottom insulating members 40 extended from the side insulating members 20. One set of top insulating members 30 is used to limit the positive tabs, and the other set of top insulating members 30 is used to limit the negative tabs. Correspondingly, the first bottom insulating member 41 and the second bottom insulating member 42 respectively extend from the first side surfaces 111 covered by their corresponding side insulating members 20 to cover the bottom surface of the body 11, realizing the bottom surface covering of the body 11, and covering two common sides of the bottom surface and the first side surfaces 111, preventing them from being exposed and ensuring their insulation effect.

[0064] In some embodiments, Figure 6 A structural schematic diagram of the first insulating member and the second insulating member is shown. Continuing as Figure 4 , Figure 5 and Figure 6 shown, the insulating component further includes two oppositely arranged first insulating members 50. The body 11 further includes two oppositely arranged second side surfaces 112. The two first insulating members 50 respectively cover the two second side surfaces 112.

[0065] Specifically, the body 11 is a cuboid structure. Its side surfaces include four side surfaces, two of which are arranged oppositely. The tabs 12 are located on the top surface. The tabs 12 are stacked along the first direction. The first direction is perpendicular to two opposite sides of the top surface. Then the two opposite side surfaces corresponding to these two opposite sides are the two second side surfaces 112.

[0066] The two first insulating members 50 respectively cover the two second side surfaces 112 to achieve insulating covering of these two side surfaces, further ensuring the insulation effect of the electrode component 10.

[0067] Two side insulation members 20 respectively cover two first side surfaces 111, and two first insulation members 50 respectively cover two second side surfaces 112. All four side surfaces of the body 11 are covered, so that the side surfaces of the body are insulated and protected, which is beneficial to improving the safety performance of the battery cell.

[0068] In some embodiments, continuing as Figure 4 and Figure 5 shown, the insulation assembly further includes a connecting member 60 extending from the side insulation member 20 to the side surface of the body 11, and the connecting member 60 is connected to the first insulation member 50.

[0069] Specifically, the top insulation member 30 extends from the top edge of the side insulation member 20 to the top surface of the body 11, the bottom insulation member 40 extends from the bottom edge of the side insulation member 20 to the bottom surface of the body 11, and the portions of the two side edges of the side insulation member 20 extending to the side surface of the body 11 are the connecting members 60. Since the side insulation member 20 covers the first side surface 111, the connecting member 60 extends from the side insulation member 20 to the second side surface 112 of the body 11.

[0070] The connecting member 60 is integrally connected to the side insulation member 20. The connecting member 60 is connected to the first insulation member 50, which can block the gap between the side insulation member 20 and the first insulation member 50, and is beneficial to the insulation effect of the electrode assembly 10.

[0071] In some embodiments, continuing as Figure 5 and Figure 6 shown, a second insulation member 70 is provided between the two first insulation members 50, and the second insulation member 70 covers the bottom surface of the body 11.

[0072] Specifically, the second insulation member 70 covers the bottom surface of the body 11, and its two opposite sides close to the two second side surfaces 112 are integrally connected to the two first insulation members 50 respectively, so that there is no connection gap between the first insulation member 50 and the second insulation member 70, which is beneficial to the insulation effect of the insulation assembly on the electrode assembly 10.

[0073] In some embodiments, continuing as Figure 4 shown, one side of the first insulation member 50 away from the body 11 is connected to the connecting member 60.

[0074] Specifically, the connecting member 60 is connected to the side of the first insulation member 50 away from the second side surface 112, so that the connecting member 60 completely covers the gap between the first insulation member 50 and the side insulation member 20. This can not only ensure that the insulation assembly stably wraps the electrode assembly 10 to achieve a stable insulation effect, but also make the insulation assembly adapt to the periphery of the electrode assembly 10, which is beneficial to the subsequent operation of inserting the wrapped electrode assembly 10 into the shell.

[0075] Exemplarily, continuing as Figure 4 andFigure 5 As shown in the figure, the process of covering the electrode assembly 10 with the insulation assembly is as follows: Place the electrode assembly 10 to be covered with the insulation assembly on an empty operating platform. First, place the two side insulation members 20 at two opposite first side surfaces 111 respectively (the determination method of the first side surface 111 is: determine the stacking direction of the tab 12, that is, the first direction, and determine the first side surface 111 based on the first direction). Then, operate the two top insulation members 30 connected to the side insulation members 20 to be located at the side surfaces of the tab 12 and cover part of the tab 12. Then, place the integrally connected two first insulation members 50 and the second insulation member 70 between the two side insulation members 20, so that the two first insulation members 50 respectively cover the two second side surfaces 112, and the second insulation member 70 covers the bottom surface of the body 11. After that, cover the bottom surface of the body 11 with the two bottom insulation members 40 corresponding to the two side insulation members 20 respectively (the second insulation member 70 has covered the bottom surface, and the two bottom insulation members 40 are stacked and covered under the second insulation member 70 to further cover the bottom surface). Finally, paste the four connecting members 60 on the two side insulation members 20 to the side of the corresponding first insulation member 50 away from the body 11.

[0076] Based on the same inventive concept, Figure 7 shows a schematic internal bottom view structure of the battery cell, as Figure 5 and Figure 7 shown, the present application also provides a battery cell, including an insulation assembly for covering the electrode assembly 10 as described above, the electrode assembly 10, a housing, and a top cover 80. The housing and the top cover 80 enclose a sealed cavity. The insulation assembly is located in the cavity and covers the electrode assembly 10. The tab 12 of the electrode assembly 10 is connected to the top cover 80.

[0077] Specifically, the housing is a lidless housing with an opening at the top. The top cover 80 is adapted to the opening of the housing. After the insulation assembly covers the electrode assembly 10, the tab 12 of the electrode assembly 10 is connected to the pole column 81 on the top cover 80. The tops of the two first insulation members 50 of the insulation assembly are connected to the inner bottom wall of the corresponding top cover 80. Finally, it is placed into the housing through the opening of the housing, and the top cover 80 and the housing are encapsulated to form a battery cell.

[0078] Those of ordinary skill in the art should understand that: The discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.

[0079] Embodiments of the present utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An insulating component for coating an electrode assembly, the electrode assembly including a body and an electrode tab extending from the top surface of the body, the electrode tabs being stacked in a first direction, characterized in that, The insulating component includes a side insulating member and a top insulating member extending from the side insulating member to the top surface of the body. The projection of the top insulating member on the top surface does not coincide with the projection of the tab on the top surface at least partially in the first direction.

2. The insulating component for coating an electrode assembly according to claim 1, characterized in that, The top insulating member includes a first top insulating member and a second top insulating member arranged at intervals. A gap between the first top insulating member and the second top insulating member allows the tab to protrude.

3. An insulating component for coating an electrode assembly according to claim 2, characterized in that, The first top insulating member and the second top insulating member are in contact with the tab.

4. The insulating component for coating an electrode assembly according to claim 2, wherein The tab includes a first tab and a second tab in the first direction. The top insulating member further includes a third top insulating member disposed between the first top insulating member and the second top insulating member. A gap between the first top insulating member and the third top insulating member allows the first tab to protrude, and a gap between the second top insulating member and the third top insulating member allows the second tab to protrude.

5. The insulating component for coating an electrode assembly according to claim 4, characterized in that, The first top insulating member and the third top insulating member are respectively in contact with both sides of the first tab, and the second top insulating member and the third top insulating member are respectively in contact with both sides of the second tab.

6. An insulating component for coating an electrode assembly according to any one of claims 1 to 5, characterized in that The thickness of the top insulating member is 0.01 to 2 millimeters.

7. An insulating component for coating an electrode assembly according to claim 5, characterized in that, The insulating component further includes a bottom insulating member extending from the side insulating member to the bottom surface of the body. The bottom insulating member covers the bottom surface of the body.

8. An insulating component for coating an electrode assembly according to claim 7, characterized in that, There are two side insulating members. The body includes two opposite first side surfaces parallel to the first direction. The two side insulating members are respectively used to cover the two first side surfaces. The two side insulating members respectively extend to the bottom surface with a first bottom insulating member and a second insulating member. The sum of the projections of the first bottom insulating member and the second bottom insulating member on the bottom surface covers the bottom surface.

9. An insulating component for coating an electrode assembly according to any one of claims 1 to 5 and 7 to 8, characterized in that The insulating component further includes two relatively arranged first insulating members. The body further includes two relatively arranged second side surfaces. The two first insulating members respectively cover the two second side surfaces.

10. An insulating component for coating an electrode assembly according to claim 9, characterized in that, The insulating component further includes a connecting member extending from the side insulating member to the side surface of the body. The connecting member is connected to the first insulating member; and / or, a second insulating member is provided between the two first insulating members. The second insulating member covers the bottom surface of the body.

11. A battery cell, characterized in that, It includes an insulating component for covering an electrode component, an electrode component, a housing and a top cover according to any one of claims 1 to 10. The housing and the top cover enclose a sealed cavity. The insulating component is located in the cavity and covers the electrode component. The tab of the electrode component is connected to the top cover.

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