Battery cover assembly and battery cell

Abstract

The present application relates to the field of battery technology, and in particular to a battery cell cover plate assembly and a battery cell, wherein the battery cell cover plate assembly includes a cover plate, a cover plate insulating protective sheet, an explosion-proof valve, and an explosion-proof valve insulating protective sheet. Along a first preset direction, the cover plate is formed with a mounting through hole penetrating the first side and the second side thereof, and the explosion-proof valve is mounted in the mounting through hole; the explosion-proof valve insulating protective sheet is arranged on the second side of the cover plate to cover the mounting through hole; the cover plate insulating protective sheet is arranged on the second side of the cover plate, and the cover plate insulating protective sheet is formed with an explosion-proof valve avoidance hole for avoiding the explosion-proof valve, and the cover plate insulating protective sheet and the explosion-proof valve insulating protective sheet partially overlap. It can be seen that by overlapping the cover plate insulating protective sheet and the explosion-proof valve insulating protective sheet by a certain bonding area, the bonding area of ​​the cover plate insulating protective sheet and the explosion-proof valve insulating protective sheet is maximized within a limited space, thereby greatly reducing the risk of the cover plate insulating protective sheet and the explosion-proof valve insulating protective sheet falling off.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover assembly and a battery cell. Background Art

[0002] like Figure 1 and Figure 2 As shown, a lithium battery cell is generally composed of a cover plate 1', a shell 2', an electrode group 3' and an electrolyte. The external insulation of the shell 2' is generally achieved by spraying insulating materials, wrapping with PET insulating tape, etc. The insulation of the cover plate 1' is generally achieved by pasting a PC insulating top cover patch. The explosion-proof valve position is pasted with an explosion-proof valve insulating patch 5' for protection when the cover plate 1' is supplied. The cover plate insulating top cover patch 4' is gap-matched with the explosion-proof valve insulating patch 5'.

[0003] At present, in order to improve the space utilization rate of the entire battery package and increase the energy density, single batteries are made thinner and thinner, and the size of the top cover is getting smaller and smaller. In addition, the battery cover plate 1' is also integrated with structures such as poles, explosion-proof valves, and battery temperature sensing areas. It is necessary to avoid the above structures, resulting in the effective bonding area between the insulating top cover patch and the cover plate 1' becoming smaller and smaller. In the battery cell process and subsequent grouping process, the insulating top cover patch is prone to warping and falling off, which seriously affects the insulation effect and production efficiency of the battery cell. Moreover, the explosion-proof valve insulating patch 5' in the explosion-proof valve area often falls off due to its very limited bonding area. Summary of the invention

[0004] The purpose of the present application is to provide a battery cover assembly and a battery cell, which to a certain extent solves the technical problem in the prior art that the cover insulating top cover patch and the explosion-proof valve insulating patch are prone to warping and falling off due to the smaller and smaller size of the top cover of the single battery cell, which seriously affects the insulation effect and production efficiency of the battery cell.

[0005] The present application provides a battery cell cover plate assembly, comprising: a cover plate, a cover plate insulating protective sheet, an explosion-proof valve, and an explosion-proof valve insulating protective sheet; wherein, along a first preset direction, the cover plate is formed with a mounting through hole penetrating a first side and a second side thereof, and the explosion-proof valve is mounted in the mounting through hole;

[0006] The explosion-proof valve insulating protective sheet is arranged on the second side of the cover plate and is used to cover the installation through hole; the cover plate insulating protective sheet is arranged on the second side of the cover plate, and the cover plate insulating protective sheet is formed with an explosion-proof valve avoidance hole for avoiding the explosion-proof valve, and the cover plate insulating protective sheet and the explosion-proof valve insulating protective sheet partially overlap.

[0007] In any of the above technical solutions, further, along the first preset direction and from the first side of the cover plate toward its second side, the mounting through hole includes a first through hole portion and a second through hole portion arranged in sequence, and a supporting step surface is formed between the second through hole portion and the first through hole portion, and the explosion-proof valve is installed in the second through hole portion and placed on the supporting step surface.

[0008] In any of the above technical solutions, further, along the first preset direction, the projection of the explosion-proof valve insulating protection sheet can cover at least part of the projection of the second through hole portion, and the circumferential gap value between the projection of the explosion-proof valve insulating protection sheet that can cover the second through hole portion and the corresponding projection of the second through hole portion is a, the size of the projection of the second through hole portion along the second preset direction is C, and 0.05≤a / C≤0.12.

[0009] In any of the above technical solutions, further, along the first preset direction, at least a partial projection of the explosion-proof valve insulating protection sheet can cover the projection of the second through hole portion, and a circumferential gap value between the projection of the explosion-proof valve insulating protection sheet that can cover the second through hole portion and the projection of the second through hole portion is a, and a=0.7-1.0mm.

[0010] In any of the above technical solutions, further, along the first preset direction, the projection of the explosion-proof valve avoidance hole can cover the projection of the notch of the explosion-proof valve, and the circumferential clearance value between the explosion-proof valve avoidance hole and the projection of the notch of the explosion-proof valve is c, the size of the projection of the notch of the explosion-proof valve along the second preset direction is D, and 0.04≤c / D≤0.15.

[0011] In any of the above technical solutions, further, along the first preset direction, the projection of the explosion-proof valve avoidance hole can cover the projection of the notch of the explosion-proof valve, and the circumferential clearance value between the projection of the explosion-proof valve avoidance hole and the projection of the notch of the explosion-proof valve is c, and c=0.5-1.0mm.

[0012] In any of the above technical solutions, further, the explosion-proof valve avoidance hole is umbrella-shaped, and includes an umbrella head hole portion and an umbrella handle hole portion arranged in sequence, and along the first preset direction, the projection of the umbrella head hole portion can cover the projection of the explosion-proof valve insulating protection sheet, the notch of the explosion-proof valve and the second through hole portion located at the same end; along the first preset direction, the projection of the second through hole portion and the projection of the explosion-proof valve insulating protection sheet can cover the projection of the umbrella handle hole portion.

[0013] In any of the above technical solutions, further, the circumferential gap between the projection of the explosion-proof valve insulating protection sheet along the first preset direction and the projection of the umbrella handle hole along the first preset direction is b, the size of the projection of the explosion-proof valve insulating protection sheet along the first preset direction along the second preset direction is B, and 0.08≤b / B≤0.23.

[0014] In any of the above technical solutions, further, a circumferential gap between a projection of the explosion-proof valve insulating protection sheet along the first preset direction and a projection of the umbrella handle hole along the first preset direction is b, and b=1.2-2.0 mm.

[0015] In any of the above technical solutions, further, along the first preset direction, the projection of the cover plate can cover the projection of the cover plate insulating protection sheet, and the circumferential gap between the cover plate and the cover plate insulating protection sheet is d, and d=0.25-0.5mm.

[0016] In any of the above technical solutions, further, along the first preset direction, the ratio of the projected area of ​​the cover insulating protection sheet to the projected area of ​​the cover is m, and m≥50%.

[0017] In any of the above technical solutions, further, along the first preset direction, the ratio of the projected area of ​​the region where the explosion-proof valve insulating protection sheet and the cover plate insulating protection sheet overlap to the projected area of ​​the explosion-proof valve insulating protection sheet is n, and 25%≤n≤30%.

[0018] In any of the above technical solutions, further, the battery cover assembly further includes a pole, a connector and an insulating member; wherein the pole is installed in the through hole of the cover and is riveted together with the connector located on the second side of the cover;

[0019] The insulating member is sleeved on the outside of the pole and pressed between the connector and the cover plate; the cover plate insulating protection sheet is formed with an avoidance hole for avoiding the connector, and a circumferential assembly gap exists between the avoidance hole and the connector.

[0020] In any of the above technical solutions, further, a circumferential assembly clearance value between the pole avoidance hole and the connecting piece is 0.1-0.3 mm.

[0021] In any of the above technical solutions, further, the explosion-proof valve is a waist-shaped structure, the installation through hole is a waist-shaped hole, and the explosion-proof valve insulating protection sheet is a waist-shaped structure with a flat section formed at one end along its length direction.

[0022] In any of the above technical solutions, further, the explosion-proof valve insulation protection sheet is bonded to the cover plate, the cover plate insulation protection sheet is bonded to the cover plate, and the explosion-proof valve insulation protection sheet is bonded to the cover plate insulation protection sheet.

[0023] The present application also provides a battery cell, comprising a housing, an electrode group, and a battery cell cover assembly as described in any of the above technical solutions, wherein the electrode group is installed in the housing, and the battery cell cover assembly is sealed at the opening of the housing. Therefore, all the beneficial technical effects of the battery cell cover assembly are achieved, and no further description is given here.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] In the battery cell cover assembly provided by the present application, the bonding area of ​​the cover insulating protection sheet and the explosion-proof valve insulating protection sheet is overlapped by a certain bonding area, so as to maximize the bonding area of ​​the cover insulating protection sheet and the explosion-proof valve insulating protection sheet within a limited space, thereby greatly reducing the risk of falling off of the cover insulating protection sheet and the explosion-proof valve insulating protection sheet, making it safer and more reliable, avoiding the occurrence of problems such as short circuits, and improving the safety and reliability of the battery pack during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A partial exploded view of a battery cell provided by the prior art;

[0028] Figure 2 An assembly diagram of a cell cover structure provided by the prior art;

[0029] Figure 3 An exploded view of a cell cover assembly provided in an embodiment of the present application;

[0030] Figure 4 for Figure 3 A schematic diagram of a local enlarged structure;

[0031] Figure 5 A schematic diagram of the structure of the cover plate provided in an embodiment of the present application;

[0032] Figure 6 for Figure 5 A schematic diagram of a local enlarged structure;

[0033] Figure 7 An assembly diagram of a cell cover assembly provided in an embodiment of the present application;

[0034] Figure 8 for Figure 7 A schematic diagram of the enlarged structure at B;

[0035] Fig. 9 for Figure 7 Schematic diagram of the enlarged structure at A.

[0036] Reference numerals:

[0037] 1'-cover, 2'-shell, 3'-pole group, 4'-cover insulation top cover patch, 5'-explosion-proof valve insulation patch;

[0038] 1-cover plate, 11-installation through hole, 112-second through hole portion, 2-cover plate insulating protective sheet, 21-explosion-proof valve avoidance hole, 211-umbrella head hole portion, 212-umbrella handle hole portion, 3-explosion-proof valve, 31-notch, 4-explosion-proof valve insulating protective sheet, 5-pole, 6-connecting piece, 7-insulating piece, z-first preset direction, y-second preset direction. DETAILED DESCRIPTION

[0039] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0041] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Refer to the following Figures 3 to 9 The battery cell cover plate assembly and the battery cell according to some embodiments of the present application are described.

[0045] Embodiment 1

[0046] See also Figures 3 to 9 As shown, an embodiment of the present application provides a battery cell cover assembly, comprising: a cover 1, a cover insulating protective sheet 2, an explosion-proof valve 3, and an explosion-proof valve insulating protective sheet 4; wherein, along a first preset direction z, the cover 1 is formed with a mounting through hole 11 penetrating through the first side and the second side thereof, and the explosion-proof valve 3 is mounted in the mounting through hole 11;

[0047] The explosion-proof valve insulating protective sheet 4 is arranged on the second side of the cover plate 1 and is used to cover the installation through hole 11; the cover plate insulating protective sheet 2 is arranged on the second side of the cover plate 1, and the cover plate insulating protective sheet 2 is formed with an explosion-proof valve avoidance hole 21 for avoiding the explosion-proof valve 3, and part of the structure of the cover plate insulating protective sheet 2 and the explosion-proof valve insulating protective sheet 4 overlap together.

[0048] According to the structure described above, it can be known that by overlapping the cover insulating protection sheet 2 and the explosion-proof valve insulating protection sheet 4 by a certain bonding area, the bonding area of ​​the cover insulating protection sheet 2 and the explosion-proof valve insulating protection sheet 4 is maximized within a limited space, thereby greatly reducing the risk of the cover insulating protection sheet 2 and the explosion-proof valve insulating protection sheet 4 falling off, making it safer and more reliable, avoiding the occurrence of problems such as short circuits, and improving the safety and reliability of the battery pack during use.

[0049] Further, preferably, the first preset direction z may be the thickness direction of the cover plate 1, and the first side refers to the inner side of the cover plate 1, that is, the side close to the electrode group, and the second side refers to the outer side of the cover plate 1, that is, the side away from the electrode group and located outside the shell of the battery cell. Of course, the first preset direction z is not limited to this.

[0050] In this embodiment, preferably, Figures 3 to 6As shown, along the first preset direction z and from the first side of the cover plate 1 toward its second side, the mounting through hole 11 includes a first through hole portion and a second through hole portion 112 arranged in sequence, and a supporting step surface is formed between the second through hole portion 112 and the first through hole portion, and the explosion-proof valve 3 is installed in the second through hole portion 112 and placed on the supporting step surface.

[0051] According to the structure described above, the mounting through hole 11 is a two-stage step hole, and along the first preset direction z and from the first side of the cover plate 1 toward the second side thereof, the size of the step hole is increased, thereby forming a supporting step surface between the two through hole portions, which can more stably support the explosion-proof valve 3, making it difficult for the explosion-proof valve 3 to separate from the mounting through hole 11, and the structure is more reliable.

[0052] Further, preferably, the mounting through hole 11 is a waist-shaped hole, that is, the first through hole portion and the second through hole portion 112 are both waist-shaped holes, which are the same shape as the waist-shaped explosion-proof valve 3, meeting conventional assembly requirements. Of course, the shape of the explosion-proof valve 3 is not limited to waist-shaped, but can also be other shapes. In this case, the shape of the mounting through hole 11 will also change accordingly, and it is specifically designed according to actual needs. For example, when the explosion-proof valve 3 is circular, the mounting through hole 11 is also circular, and so on.

[0053] Further, preferably, the size of the second through hole portion 112 is smaller than that of the first through hole portion, and the aforementioned support step surface is naturally formed between the two, so that the explosion-proof valve 3 can be installed in the first through hole portion from the inner side of the cover plate 1, that is, the first side, and it is seated on the support step surface. Of course, it is not limited to this, and the size of the second through hole portion 112 can also be larger than the first through hole portion, which is selected according to actual needs.

[0054] It should be noted that the structure of the mounting through hole 11 is not limited to the above-mentioned two-level step hole, but can also be a step hole with more than two levels, such as a three-level step hole, and the size of the step hole is reduced or increased along the first preset direction z and from the first side of the cover plate 1 toward its second side, and the explosion-proof valve 3 is installed in the other through hole parts except the uppermost part, and the specific design is based on actual needs.

[0055] In addition, it should be noted that: in this embodiment, the explosion-proof valve 3 is waist-shaped, and is provided with a waist-shaped notch 31 extending along its circumference, and a certain distance is formed between the waist-shaped notch 31 and the outer edge of the explosion-proof valve 3. Of course, the shape of the explosion-proof valve 3 is not limited to this, and other shapes can be selected according to actual needs.

[0056] In this embodiment, preferably, Figure 8As shown, along the first preset direction z, the explosion-proof valve insulating protection plate 4 can cover at least part of the projection of the second through hole portion 112, that is, the circumferential gap value between the projection of the second through hole portion 112 that can be covered by the explosion-proof valve insulating protection plate 4 and the corresponding projection of the second through hole portion 112 is a, and the size of the projection of the second through hole portion 112 along the second preset direction y is C, and 0.05≤a / C≤0.12.

[0057] According to the structure described above, it can be known that the size B of the explosion-proof valve insulating protection sheet 4 is larger than the size C of the explosion-proof valve 3, that is, the explosion-proof valve insulating protection sheet 4 exceeds the explosion-proof valve 3, and 0.05≤a / C≤0.12 is set to ensure that the explosion-proof valve insulating protection sheet 4 can cover the explosion-proof valve 3, and the bonding strength between the explosion-proof valve insulating protection sheet 4 and the cover plate 1 can be ensured, so that the explosion-proof valve insulating protection sheet 4 is not easy to fall off.

[0058] Further, preferably, along the first preset direction z, the projection of the explosion-proof valve insulating protection plate 4 can cover at least part of the projection of the second through hole portion 112, and the circumferential gap value between the projection of the explosion-proof valve insulating protection plate 4 that can cover the second through hole portion 112 and the projection of the second through hole portion 112 is a, and a=0.7-1.0mm.

[0059] Further, preferably, in a third preset direction, such as the length direction of the explosion-proof valve 3, one end of the explosion-proof valve insulating protective sheet 4 can completely cover one end of the second through hole portion 112, and the other end of the explosion-proof valve insulating protective sheet 4 does not cover the other end of the second through hole portion 112, that is, the other end of the second through hole portion 112 is exposed to the explosion-proof valve insulating protective sheet 4, so when the explosion-proof valve 3 is cracked and leaking, it can be discovered in time through helium detection during the process. Of course, it is not limited to this. One end of the explosion-proof valve insulating protective sheet 4 can completely cover one end of the second through hole portion 112, and the other end of the explosion-proof valve insulating protective sheet 4 can also completely not cover the other end of the second through hole portion 112. In this case, it is necessary to set a slit in the explosion-proof valve insulating protective sheet 4, so when the explosion-proof valve 3 is cracked and leaking, it can also be discovered in time through helium detection during the process.

[0060] In this embodiment, preferably, Figure 8 As shown, along the first preset direction z, the projection of the explosion-proof valve avoidance hole 21 can cover the projection of the notch 31 of the explosion-proof valve 3, and the circumferential gap value between the explosion-proof valve avoidance hole 21 and the projection of the notch 31 of the explosion-proof valve 3 is c, and the size of the projection of the notch 31 of the explosion-proof valve 3 along the second preset direction y is D, and 0.04≤c / D≤0.15. It should be noted that: c=(AD) / 2.

[0061] According to the structure described above, the size A of the explosion-proof valve avoidance hole 21 on the cover plate insulating protection sheet 2 is smaller than the size D of the first through hole portion, i.e., the explosion-proof notch of the explosion-proof valve 3, and 0.04≤c / D≤0.15 is set to ensure that the opening pressure of the explosion-proof valve 3 is not affected.

[0062] Further, preferably, along the first preset direction z, the projection of the explosion-proof valve avoidance hole 21 can cover the projection of the notch 31 of the explosion-proof valve 3, and the circumferential gap value between the projection of the explosion-proof valve avoidance hole 21 and the projection of the notch 31 of the explosion-proof valve 3 is c, and c=0.5-1.0mm.

[0063] In this embodiment, preferably, Figure 8 As shown, the explosion-proof valve avoidance hole 21 is umbrella-shaped, and includes an umbrella head hole portion 211 and an umbrella handle hole portion 212 arranged in sequence, and along the first preset direction z, the projection of the umbrella head hole portion 211 can cover the projections of the explosion-proof valve insulation protection sheet 4, the notch 31 of the explosion-proof valve 3 and the second through hole portion 112 located at the same end;

[0064] Further, preferably, the circumferential gap between the projection of the explosion-proof valve insulating protection sheet 4 along the first preset direction z and the projection of the umbrella handle hole 212 along the first preset direction z is b, the size of the projection of the explosion-proof valve insulating protection sheet 4 along the first preset direction z along the second preset direction y is B, and 0.08≤b / B≤0.23.

[0065] According to the structure described above, it can be known that the size A of the explosion-proof valve avoidance hole 21 is smaller than the size B of the explosion-proof valve insulating protection sheet 4, and if 0.08≤b / B≤0.23, then part of the structure of the explosion-proof valve insulating protection sheet 4 will be pressed under the cover insulating protection sheet 2, reducing the risk of the explosion-proof valve insulating protection sheet 4 falling off, and increasing the effective bonding area of ​​the cover insulating protection sheet 2, thereby improving the stability of the cover insulating protection sheet 2.

[0066] Further, preferably, the circumferential gap between the projection of the explosion-proof valve insulating protection sheet 4 along the first preset direction z and the projection of the umbrella handle hole 212 along the first preset direction z is b, and b=1.2-2.0 mm.

[0067] In this embodiment, preferably, Figure 8 As shown, along the first preset direction z, the projection of the cover plate 1 can cover the projection of the cover plate insulating protection sheet 2, and the circumferential gap between the cover plate 1 and the cover plate insulating protection sheet 2 is d, and d=0.25-0.5mm.

[0068] According to the structure described above, setting the circumferential gap value d between the cover plate 1 and the cover plate insulating protection sheet 2 within the range of 0.25-0.5 mm can prevent the edge of the cover plate insulating protection sheet 2 from warping, thereby preventing the cover plate insulating protection sheet 2 from falling off and ensuring the insulation effect.

[0069] In this embodiment, preferably, along the first preset direction z, the ratio of the projection area of ​​the cover plate insulating protection sheet 2 to the projection area of ​​the cover plate 1 is m, and m≥50%.

[0070] According to the structure described above, the effective area of ​​the cover insulating protection sheet 2 pasted on the cover 1 accounts for more than 50% of the area of ​​the cover 1 itself, which improves the insulation effect and makes the cover insulating protection sheet 2 more firm and not easy to fall off.

[0071] In this embodiment, preferably, along the first preset direction z, the ratio of the projected area of ​​the region where the explosion-proof valve insulating protection sheet 4 overlaps with the cover plate insulating protection sheet 2 to the projected area of ​​the explosion-proof valve insulating protection sheet 4 is n, and 25%≤n≤30%.

[0072] According to the structure described above, the area where the cover insulating protection sheet 2 presses the explosion-proof valve insulating protection sheet 4 underneath accounts for 25-30% of the area of ​​the explosion-proof valve insulating protection sheet 4 itself, ensuring that the two have sufficient alternating area, making the explosion-proof valve insulating protection sheet 4 less likely to fall off, thereby improving the insulation effect.

[0073] In this embodiment, preferably, Fig. 9 As shown, the cell cover assembly further includes a pole 5, a connector 6 and an insulating member 7; wherein the pole 5 is installed in the through hole of the cover 1 and is riveted together with the connector 6 located on the second side of the cover 1;

[0074] The insulating member 7 is sleeved on the outside of the pole 5 and pressed between the connector 6 and the cover plate 1 ; the cover plate insulating protection sheet 2 is formed with an avoidance hole for avoiding the connector 6 , and a circumferential assembly gap exists between the avoidance hole and the connector 6 .

[0075] According to the structure described above, it can be seen that the size of the connecting member 6 is smaller than the pole avoidance hole, that is, along the first preset direction z, the projection of the connecting member 6 completely falls into the projection of the pole avoidance hole, and there is an assembly gap between the pole avoidance hole and the connecting member 6, so as to avoid interference, facilitate assembly, and avoid problems such as warping and deformation of the insulating protective sticker of the cover plate 1.

[0076] Furthermore, preferably, the circumferential assembly clearance value e between the pole avoidance hole and the connector 6 is 0.1-0.3 mm, and detailed data is provided, which can be used as a guide for later production and is of great significance. Moreover, if k is too large, the area of ​​the insulating protective sticker of the cover plate 1 will be reduced, and if k is too small, interference is likely to occur, making assembly inconvenient.

[0077] In this embodiment, preferably, the explosion-proof valve insulation protection sheet 4 is bonded to the cover plate 1, the cover plate insulation protection sheet 2 is bonded to the cover plate 1, and the explosion-proof valve insulation protection sheet 4 is bonded to the cover plate insulation protection sheet 2. Of course, it is not limited to this.

[0078] In summary, in order to verify the effect of the scheme, actual measurements were carried out on schemes of different sizes. The verification results are shown in Table 1 below. Combined with the above table, it can be seen that when a / C>0.12, the size of the explosion-proof valve insulating protective sheet 4 is too large, and it is easy to interfere with the equipment clamping fixture when the process cover plate is loaded; when c / D>0.15, the size of the explosion-proof valve avoidance hole 21 is too large, and the pasting area will be reduced; when b / B>0.23, the size of the explosion-proof valve avoidance hole 21 is too small, which will affect the opening pressure of the explosion-proof valve 3.

[0079] Embodiment 2

[0080] Embodiment 2 of the present application further provides a battery cell, comprising the battery cell cover assembly described in Embodiment 1 above, and thus has all the beneficial technical effects of the battery cell cover assembly, and the same technical features and beneficial effects are not repeated here.

[0081] In this embodiment, preferably, the battery cell further includes a shell and a pole group (not shown in the figure); wherein the pole group is installed in the shell, and the battery cell cover plate assembly is sealed at the opening of the shell.

[0082] It should be noted that: along the first preset direction z, the aforementioned battery cell cover assembly is installed at one end of the shell, and the aforementioned battery cell cover assembly can also be installed at both ends of the shell along the first preset direction z, which is selected according to actual needs.

[0083] Table 1

[0084]

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, a cover plate insulating protective sheet, an explosion-proof valve, and an explosion-proof valve insulating protective sheet; wherein, along a first preset direction, the cover plate is formed with a mounting through hole penetrating a first side and a second side thereof, and the explosion-proof valve is mounted in the mounting through hole; The explosion-proof valve insulating protective sheet is arranged on the second side of the cover plate and is used to cover the mounting through hole; the cover plate insulating protective sheet is arranged on the second side of the cover plate, and the cover plate insulating protective sheet is formed with an explosion-proof valve avoidance hole for avoiding the explosion-proof valve, and the cover plate insulating protective sheet and the explosion-proof valve insulating protective sheet partially overlap each other; Along the first preset direction and from the first side of the cover plate toward the second side thereof, the mounting through hole comprises a first through hole portion and a second through hole portion arranged in sequence, and a supporting step surface is formed between the second through hole portion and the first through hole portion, and the explosion-proof valve is mounted in the second through hole portion and placed on the supporting step surface; The explosion-proof valve avoidance hole is umbrella-shaped, and includes an umbrella head hole portion and an umbrella handle hole portion arranged in sequence, and along the first preset direction, the projection of the umbrella head hole portion can cover the projection of the explosion-proof valve insulating protection sheet, the notch of the explosion-proof valve and the second through hole portion located at the same end; along the first preset direction, the projection of the second through hole portion and the projection of the explosion-proof valve insulating protection sheet can cover the projection of the umbrella handle hole portion.

2. The battery cover assembly according to claim 1, characterized in that: Along the first preset direction, the projection of the explosion-proof valve insulating protection sheet can cover at least part of the projection of the second through hole portion, and the circumferential gap value between the projection of the explosion-proof valve insulating protection sheet that can cover the second through hole portion and the corresponding projection of the second through hole portion is a, the size of the projection of the second through hole portion along the second preset direction is C, and 0.05≤a / C≤0.12; and / or Along the first preset direction, at least part of the projection of the explosion-proof valve insulating protection sheet can cover the projection of the second through hole portion, and the circumferential gap value between the projection of the explosion-proof valve insulating protection sheet that can cover the second through hole portion and the projection of the second through hole portion is a, and a=0.7-1.0mm; and / or Along the first preset direction, the projection of the explosion-proof valve avoidance hole can cover the projection of the notch of the explosion-proof valve, and the circumferential gap value between the explosion-proof valve avoidance hole and the projection of the notch of the explosion-proof valve is c, the size of the projection of the notch of the explosion-proof valve along the second preset direction is D, and 0.04≤c / D≤0.15; and / or Along the first preset direction, the projection of the explosion-proof valve avoidance hole can cover the projection of the notch of the explosion-proof valve, and the circumferential gap value between the projection of the explosion-proof valve avoidance hole and the projection of the notch of the explosion-proof valve is c, and c=0.5-1.0mm.

3. The battery cover assembly according to claim 1, characterized in that: The circumferential gap between the projection of the explosion-proof valve insulating protection sheet along the first preset direction and the projection of the umbrella handle hole along the first preset direction is b, the dimension of the projection of the explosion-proof valve insulating protection sheet along the first preset direction along the second preset direction is B, and 0.08≤b / B≤0.23; and / or A circumferential gap between a projection of the explosion-proof valve insulating protection sheet along the first preset direction and a projection of the umbrella handle hole along the first preset direction is b, and b=1.2-2.0 mm.

4. The battery cover assembly according to claim 1, characterized in that: Along the first preset direction, the projection of the cover plate can cover the projection of the cover plate insulating protection sheet, and the circumferential gap between the cover plate and the cover plate insulating protection sheet is d, and d=0.25-0.5mm; and / or Along the first preset direction, the ratio of the projection area of ​​the cover insulating protection sheet to the projection area of ​​the cover is m, and m≥50%; and / or Along the first preset direction, the ratio of the projected area of ​​the region where the explosion-proof valve insulating protection sheet and the cover plate insulating protection sheet overlap to the projected area of ​​the explosion-proof valve insulating protection sheet is n, and 25%≤n≤30%.

5. The battery cover assembly according to claim 1, characterized in that: The cell cover plate assembly further includes a pole, a connector and an insulating member; wherein the pole is installed in the through hole of the cover plate and is riveted together with the connector located on the second side of the cover plate; The insulating member is sleeved on the outside of the pole and pressed between the connector and the cover plate; the cover plate insulating protection sheet is formed with an avoidance hole for avoiding the connector, and a circumferential assembly gap exists between the avoidance hole and the connector.

6. The battery cover assembly according to claim 5, characterized in that: The circumferential assembly clearance between the pole avoidance hole and the connecting piece is 0.1-0.3 mm.

7. The battery cover assembly according to claim 1, characterized in that: The explosion-proof valve is a waist-shaped structure, the mounting through hole is a waist-shaped hole, and the explosion-proof valve insulating protective sheet is a waist-shaped structure with a flat section formed at one end along its length direction; and / or The explosion-proof valve insulation protection sheet is bonded to the cover plate, the cover plate insulation protection sheet is bonded to the cover plate, and the explosion-proof valve insulation protection sheet is bonded to the cover plate insulation protection sheet.

8. A battery cell, characterized in that: It comprises a shell, a pole group and a cell cover assembly as claimed in any one of claims 1 to 7; wherein the pole group is installed in the shell, and the cell cover assembly is sealed at the opening of the shell.

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