Cover plate assembly and battery cell

Abstract

The utility model provides a cover plate assembly and a battery cell, the cover plate assembly comprises a cover plate body, the cover plate body comprises a first plate surface and a second plate surface which are oppositely arranged along a first direction, a first positioning groove is formed on the first plate surface, and a first bulge is formed on the second plate surface corresponding to the first positioning groove; the first insulating part is connected to the first plate surface, the first insulating part is provided with a first insulating surface close to the first plate surface, a first positioning bulge is formed on the first insulating surface, and the first positioning bulge is matched with the first positioning groove in an inserting manner; and the second insulating part is connected to the second plate surface, the second insulating part is provided with a second insulating surface close to the second plate surface, and an avoiding groove is formed in the second insulating surface and is used for accommodating the first bulge. According to the cover plate assembly and the battery cell provided by the invention, when the first positioning bulge is matched with the first positioning groove in an inserting manner, the groove wall of the first positioning groove has a limiting effect on the first positioning bulge, so that relative movement perpendicular to the first direction cannot occur between the first insulating part and the cover plate body.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a cover plate assembly and a battery cell. Background Technology

[0002] The battery cell includes a casing and a cover assembly. The cover assembly closes onto the open end of the casing, so that the cover assembly and casing together form a space for accommodating the bare battery cell. In related technologies, both the casing and the cover body welded to the casing in the cover assembly are made of aluminum. The applicant has discovered that using steel to manufacture the casing and cover body not only improves the safety of the battery cell but also increases the energy density of the battery cell by more than 3%.

[0003] However, because steel is 2 to 3 times harder than aluminum, it is not easy to thin it during stamping. When processing the cover plate body, if an anti-torsion groove is stamped on one side of the steel, a large bulge will be formed on the other side, which will adversely affect the connection between the lower insulation component and the cover plate body. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a cover plate assembly and a battery cell to solve some or all of the technical problems mentioned above.

[0005] Based on the above objectives, a first aspect of this application provides a cover plate assembly, comprising: a cover plate body, including a first plate surface and a second plate surface disposed opposite to each other along a first direction, the first plate surface forming a first positioning groove, and the second plate surface forming a first protrusion corresponding to the position of the first positioning groove; the first direction is the thickness direction of the cover plate body; a first insulating member connected to the first plate surface, the first insulating member having a first insulating surface near the first plate surface, the first insulating surface forming a protruding first positioning protrusion, the first positioning protrusion being inserted into the first positioning groove; a second insulating member connected to the second plate surface, the second insulating member having a second insulating surface near the second plate surface, the second insulating surface forming a clearance groove, the clearance groove being used to accommodate the first protrusion; and an electrode lead-out member, including a connecting plate for connecting to an electrode tab, the connecting plate being located on the side of the second insulating member away from the cover plate body.

[0006] Optionally, the first positioning groove includes a first groove opening, a first groove bottom disposed opposite to the first groove opening, and a first groove wall located between the first groove opening and the first groove bottom; the first groove wall includes a vertically disposed straight wall section, the straight wall section being used to abut and limit the first positioning protrusion.

[0007] Optionally, the electrode lead-out component further includes a through portion connected to the connecting plate, and the cover plate body is provided with a through hole through which the through portion passes; the first plate surface forms two groove groups, the two groove groups are respectively located on both sides of the through hole along the second direction, each groove group includes at least one first positioning groove, and the number and shape of the first positioning protrusion and the first positioning groove are matched; the second direction is the length direction of the cover plate body.

[0008] Optionally, each of the slot groups includes a first positioning slot, the first positioning slot extending in a C-shape on the first plate surface, with the opening of the C-shape facing the through hole; the shape of the first positioning protrusion matches the shape of the first positioning slot.

[0009] Optionally, each of the slot groups includes at least two of the first positioning slots, which are spaced apart along a third direction; the third direction intersects the second direction.

[0010] Optionally, along the first direction, a portion of the edge of the orthographic projection of the first positioning protrusion onto the first insulating surface coincides with the edge of the first insulating surface.

[0011] Optionally, the maximum dimension of the first positioning groove along the second direction is 5mm to 10mm; and / or, along the third direction, the minimum distance between the edge of the first positioning groove and the edge of the first plate surface is not less than 3mm; and / or, the first positioning protrusion is clearance-fitted with the first positioning groove, and the distance between the sidewall of the first positioning protrusion and the adjacent straight wall segment is 0.05mm; and / or, the thickness of the cover plate body is t, the depth of the first positioning groove is not greater than 3t, and the protrusion height of the first positioning protrusion matches the depth of the first positioning groove.

[0012] Optionally, the straight wall section has a smooth transition with the first plate surface; and / or, the straight wall section has a smooth transition with the bottom of the first groove; and / or, the first protrusion includes a first protrusion away from the second plate surface and a first sidewall located between the first protrusion and the second plate surface, the first sidewall having a smooth transition with the first protrusion; and / or, the groove wall of the clearance groove has a smooth transition with the second insulating surface.

[0013] Optionally, a first rounded corner is provided between the straight wall section and the first plate surface, the radius of the first rounded corner being 0.1mm to 5mm; and / or, a second rounded corner is provided between the first sidewall and the first protrusion, the radius of the second rounded corner being 0.1mm to 5mm; and / or, a third rounded corner is provided between the straight wall section and the bottom of the first groove, the radius of the third rounded corner being 0.1mm to 5mm; and / or, a fourth rounded corner is provided between the groove wall of the clearance groove and the second insulating surface, the radius of the fourth rounded corner being 0.1mm to 5mm.

[0014] Based on the same inventive concept, the second aspect of this application also provides a battery cell, including a cover assembly as described in the first aspect.

[0015] As can be seen from the above, when the first positioning protrusion and the first positioning groove are inserted into each other, the limiting effect of the groove wall on the first positioning protrusion prevents relative movement between the first insulating member and the cover plate body perpendicular to the first direction. The clearance groove of the second insulating member can accommodate the protruding first protrusion, so that other areas on the second insulating surface can fit against the second plate surface. While ensuring the reliability of the connection between the second insulating member and the cover plate body, it can also reduce the overall size of the cover plate assembly, which helps to reduce the internal space occupied by the cover plate assembly, thereby helping to improve the energy density of the battery cell using the cover plate assembly of this embodiment. In addition, the first protrusion also helps to improve the strength of the cover plate body, thereby improving the safety and sealing of the battery cell using the cover plate assembly of this embodiment.

[0016] It should also be noted that the first insulating component is not inserted entirely into the first positioning groove, but rather it is engaged with the first positioning groove only through a relatively small first positioning protrusion. This allows the space between the clearance groove and the connecting plate to be misaligned, which can achieve anti-torsion positioning between the first insulating component and the cover plate body, and also allows for a smaller thickness of the second insulating component, which helps to further improve the energy density of the battery cell. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a top view schematic diagram of the cover plate assembly of the first structure according to an embodiment of this application;

[0019] Figure 2 for Figure 1Schematic diagram of the cross section AA;

[0020] Figure 3 This is an exploded view of the cover plate assembly of the first structure according to an embodiment of this application;

[0021] Figure 4 This is a top view of the cover plate body of the first structure according to an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the first insulating member of the first structure according to an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of a cover plate assembly with a second structure according to an embodiment of this application;

[0024] Figure 7 This is a schematic diagram of another view of the cover plate assembly of the second structure according to an embodiment of this application;

[0025] Figure 8 for Figure 4 Schematic diagram of the cross-section BB in the middle;

[0026] Figure 9 for Figure 8 An enlarged schematic diagram of section C.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Cover plate body; 110. First plate surface; 120. Second plate surface; 130. Groove assembly; 131. First positioning groove; 1311. First groove opening; 1312. First groove bottom; 1313. First groove wall; 13131. Straight wall section; 140. First protrusion; 141. First side wall; 142. First protrusion;

[0029] 150. Through hole; 160. First rounded corner; 170. Second rounded corner; 180. Third rounded corner;

[0030] 200, First insulating element; 210, First insulating surface; 220, First positioning protrusion;

[0031] 300, Second insulating component; 310, Second insulating surface; 320, Clearance groove; 330, Fourth rounded corner;

[0032] 400. Electrode lead-out component; 410. Connecting plate; 420. Through section;

[0033] 500, External conductive component; 600, Sealing ring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0035] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0036] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0037] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0038] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] Figure 1 A top view schematic diagram of the cover plate assembly of the first structure is shown. Figure 2 Showing Figure 1 A schematic diagram of the cross-section AA in the middle.

[0040] like Figure 1 and Figure 2 The cover plate assembly provided in this application embodiment includes a cover plate body 100, a first insulating member 200, a second insulating member 300, and an electrode lead-out member 400. The cover plate body 100 can be made of plate-shaped steel. The cover plate body 100 includes components along a first direction (e.g., ...). Figure 2 The first plate surface 110 and the second plate surface 120 are arranged opposite each other in the Z direction (shown), with the first direction being the thickness direction of the cover plate body 100. The first insulating member 200 is connected to the first plate surface 110, and the second insulating member 300 is connected to the second plate surface 120. The electrode lead-out member 400 includes a connecting plate 410 for connecting to the electrode tab, and the connecting plate 410 is located on the side of the second insulating member 300 away from the cover plate body 100.

[0041] For example, when the cover plate body 100 is connected to the housing of the battery cell, the tabs of the bare battery cell disposed in the housing are connected to the connecting plate 410 of the electrode lead-out member 400. Then, the second plate surface 120 near the connecting plate 410 faces the inside of the housing, and the first plate surface 110 is exposed.

[0042] For example, the material of the first insulating member 200 can be plastic. Since the first insulating member 200 is connected to the exposed first plate surface 110, the first insulating member 200 can also be referred to as the upper plastic.

[0043] For example, the material of the second insulating member 300 can be plastic. Since the second insulating member 300 is connected to the second plate surface 120 facing the housing, the second insulating member 300 can also be referred to as the lower plastic.

[0044] To prevent relative torsion between the first insulating member 200 and the cover plate body 100, the first plate surface 110 is formed with a first positioning groove 131, the first insulating member 200 has a first insulating surface 210 close to the first plate surface 110, the first insulating surface 210 is formed with a protruding first positioning protrusion 220, and the first positioning protrusion 220 is inserted into the first positioning groove 131.

[0045] When the first positioning protrusion 220 is inserted into the first positioning groove 131, the groove wall of the first positioning groove 131 limits the first positioning protrusion 220, so that there will be no relative movement between the first insulating member 200 and the cover plate body 100 perpendicular to the first direction.

[0046] It should be noted that, based on the material properties of steel, after the first plate 110 is stamped, the stamped part will be bent toward the second plate 120 to form a recessed first positioning groove 131 on the first plate 110, and a first protrusion 140 is formed on the second plate 120 at the position corresponding to the first positioning groove 131.

[0047] To ensure a more reliable connection between the second insulating member 300 and the second plate surface 120, the second insulating member 300 can avoid the first protrusion 140 on the second plate surface 120. For this purpose, the second insulating member 300 has a second insulating surface 310 adjacent to the second plate surface 120, and the second insulating surface 310 has a recessed groove 320 for accommodating the first protrusion 140.

[0048] Since the recessed groove 320 can accommodate the protruding first protrusion 140, other areas on the second insulating surface 310 can fit against the second plate surface 120. This ensures reliable connection between the second insulating member 300 and the cover plate body 100 while also reducing the overall size of the cover plate assembly. This helps reduce the internal space occupied by the cover plate assembly, thereby improving the energy density of the battery cells using the cover plate assembly of this embodiment. Furthermore, the first protrusion 140 also helps increase the strength of the cover plate body 100, thereby improving the safety and sealing of the battery cells using the cover plate assembly of this embodiment.

[0049] It should also be noted that, in order to further reduce the space occupied by the cover assembly inside the housing, the connecting plate 410 can also be embedded in the second insulating member 300. However, if the orthographic projection of the groove for accommodating the connecting plate 410 on the second insulating surface 310 coincides with the clearance groove 320, the thickness of the second insulating member 300 (i.e., the dimension of the second insulating member 300 along the first direction) needs to be larger, which will increase the space occupied by the cover assembly inside the housing.

[0050] To avoid the aforementioned problems, the size of the first protrusion 140 needs to be reduced, thereby allowing the size of the recess 320 to be designed to be smaller. This enables the recess 320 to be offset from the groove for accommodating the connecting plate 410 on the second insulating member 300, providing a structural basis for reducing the thickness of the second insulating member 300. Therefore, in the above embodiment, the first insulating member 200 is not inserted entirely into the first positioning groove 131, but only through the relatively small first positioning protrusion 220 that engages with the first positioning groove 131. This achieves anti-torsion positioning between the first insulating member 200 and the cover plate body 100, while also reducing the thickness of the second insulating member 300, which helps to further improve the energy density of the battery cell.

[0051] Figure 3 An exploded view of the cover plate assembly of the first structure is shown, such as... Figure 3 In some embodiments, the electrode lead-out member 400 further includes a through portion 420 connected to the connecting plate 410, and the cover plate body 100 is provided with a through hole 150 for the through portion 420 to pass through; the first plate surface 110 forms two slot groups 130, and the two slot groups 130 are along a second direction (e.g., Figure 3 The X direction is located on both sides of the through hole 150. Each slot group 130 includes at least one first positioning slot 131. The number and shape of the first positioning protrusion 220 and the first positioning slot 131 are matched. The second direction is the length direction of the cover plate body 100.

[0052] For example, the two slot groups 130 are arranged symmetrically with respect to the through hole 150.

[0053] For example, the cover plate assembly also includes an external conductive member 500. The surface of the first insulating member 200 away from the cover plate body 100 is provided with a groove that matches the shape of the external conductive member 500. The external conductive member 500 is installed in the groove and connected to the through portion 420.

[0054] For example, the through section 420 is also fitted with a sealing ring 600.

[0055] For example, the first insulating member 200 and the second insulating member 300 are respectively provided with through holes for the through portion 420 to pass through.

[0056] In conjunction with the foregoing, since the size of the first positioning protrusion 220 is relatively small compared to the overall size of the first insulating member 200, in order to further ensure the reliable anti-torsion positioning between the first insulating member 200 and the cover plate body 100, this embodiment provides two groove groups 130, and correspondingly, two sets of first positioning protrusions 220 are also provided on the first insulating member 200.

[0057] Meanwhile, if the first insulating member 200 and the cover plate body 100 are relatively twisted, they will rotate around the central axis of the through hole 150. In this embodiment, the two groove groups 130 are set on both sides of the through hole 150 along the length direction of the cover plate body 100, which can further improve the anti-twist positioning reliability between the first insulating member 200 and the cover plate body 100.

[0058] Figure 4 A top view of the cover plate body 100 of the first structure is shown, as follows: Figure 4 In some embodiments, along the second direction, the minimum spacing L1 between the two slot groups 130 is 30 mm to 50 mm.

[0059] For example, L1 can be 30mm, 35mm, 40mm, 45mm or 50mm.

[0060] If L1 is too large, the distance between the central axis of the first positioning groove 131 and the through hole 150 will be too large, and the first insulating member 200 may rotate slightly around the central axis of the through portion 420. Since the connecting plate 410 connected to the through portion 420 is located between the two groove groups 130, if L1 is too small, it will be difficult to achieve the misalignment between the clearance groove 320 and the groove used to accommodate the connecting plate 410, and it will also limit the size of the connecting plate 410, which will affect the current carrying capacity between the bare cell and the electrode lead 400.

[0061] To avoid the above problems, this embodiment limits L1 to 30mm to 50mm, which can ensure reliable anti-torsion positioning of the first insulating member 200 and prevent the clearance groove 320 on the second insulating member 300 from encroaching on the setting space of the connecting plate 410, ensuring that the size of the connecting plate 410 is not affected by the first protrusion 140.

[0062] Figure 5 A schematic diagram of the first insulating element 200 of the first structure is shown, as follows. Figure 4 and Figure 5 In some embodiments, each slot group 130 includes a first positioning slot 131, which extends in a C-shape on the first plate surface 110 and the opening of the C-shape faces the through hole 150; the shape of the first positioning protrusion 220 matches the shape of the first positioning slot 131.

[0063] Understandably, the anti-torsion positioning function between the first positioning protrusion 220 and the first positioning groove 131 is achieved through the mutual cooperation between the side wall of the first positioning protrusion 220 and the groove wall of the first positioning groove 131. The larger the area of ​​mutual cooperation between the side wall of the first positioning protrusion 220 and the groove wall of the first positioning groove 131, the higher the reliability of the anti-torsion positioning.

[0064] Since the shape of the first positioning groove 131 matches the shape of the first positioning protrusion 220, the first positioning protrusion 220 will be used as an example for explanation. In this embodiment, the first positioning protrusion 220 is designed as a C-shape, which allows the first positioning protrusion 220 to have a large surface area while maintaining a small volume. Correspondingly, the area of ​​interaction between the side wall of the first positioning protrusion 220 and the groove wall of the first positioning groove 131 is also larger, which helps to improve the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131.

[0065] like Figure 2 In some embodiments, the dimension L2 of the first positioning protrusion 220 perpendicular to the extension direction is 0.7 mm to 1 mm.

[0066] For example, L2 can be 0.7mm, 0.8mm, 0.9mm or 1mm.

[0067] If L2 is too large, the first protrusion 140 will be too large, thus encroaching on the space of the connecting plate 410; if L2 is too small, the strength of the first positioning protrusion 220 will be weak, which will adversely affect the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131. To avoid the above problems, this embodiment limits L2 to 0.7mm to 1mm, which can both prevent the first protrusion 140 from encroaching on the space of the connecting plate 410 and ensure the strength of the first positioning protrusion 220, thus ensuring the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131.

[0068] Figure 6 A schematic diagram of the second type of cover plate assembly is shown. Figure 7 A schematic diagram showing another view of the cover plate assembly of the second structure is presented.

[0069] like Figure 6 and Figure 7 In some embodiments, each slot group 130 includes at least two first positioning slots 131, the at least two first positioning slots 131 being along a third direction (e.g., Figure 6 The Y-direction is spaced out; the third direction intersects with the second direction.

[0070] For example, the shape of the cross section of the first positioning groove 131 perpendicular to the first direction can be a rounded rectangle.

[0071] In addition to setting the first positioning groove 131 and the first positioning protrusion 220 to C-shape, the reliability of anti-torsion positioning between the two can also be improved by increasing the number of the first positioning groove 131 and the first positioning protrusion 220.

[0072] like Figure 5 and Figure 7 In some embodiments, along a first direction, a portion of the edge of the first positioning protrusion 220 projected onto the first insulating surface 210 coincides with the edge of the first insulating surface 210.

[0073] In this embodiment, the first positioning protrusion 220 is disposed along the edge of the first insulating surface 210, which helps to ensure the positional accuracy of the first positioning protrusion 220. At the same time, when assembling the first insulating component 200 and the cover plate body 100, since the portion of the first positioning protrusion 220 near the edge of the first insulating surface 210 is not obstructed, the assembly difficulty of the first insulating component 200 and the cover plate body 100 can be reduced.

[0074] like Figure 4 In some embodiments, the maximum dimension L3 of the first positioning groove 131 along the second direction is 5 mm to 10 mm.

[0075] For example, L3 can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0076] If L3 is too large, the first protrusion 140 will encroach on the setting space of the connecting plate 410; if L3 is too small, in order to fit with the first positioning groove 131, the size of the first positioning protrusion 220 also needs to be designed to be smaller, which will result in the first positioning protrusion 220 having less strength, which will have an adverse effect on the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131.

[0077] To avoid the above problems, this embodiment limits L3 to 5mm to 10mm, which can both prevent the first protrusion 140 from occupying the setting space of the connecting plate 410 and ensure the strength of the first positioning protrusion 220, thus ensuring the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131.

[0078] like Figure 4 In some embodiments, along a third direction, the minimum distance L4 between the edge of the first positioning groove 131 and the edge of the first plate surface 110 is not less than 3mm.

[0079] For example, L4 can be 3mm, 3.3mm, 3.6mm, 4mm, 4.3mm, 4.6mm or 5mm.

[0080] If L4 is too small, the first insulating component 200 that mates with the first positioning groove 131 will be too close to the edge of the cover plate body 100. When the cover plate body 100 is welded to the shell, the heat of the molten pool will be transferred to the first insulating component 200, which will have an adverse effect on the first insulating component 200, especially on the first positioning protrusion 220.

[0081] To avoid the above problems, this embodiment limits L4 to not less than 3mm, which can ensure that a safe distance is maintained between the edge of the first insulating member 200 and the cover plate body 100, and prevent adverse effects on the first positioning protrusion 220 when the cover plate body 100 is welded to the shell.

[0082] Figure 8 Showing Figure 4 Schematic diagram of the cross-section BB in the middle. Figure 9 Showing Figure 8 An enlarged schematic diagram of section C.

[0083] like Figure 8 and Figure 9In some embodiments, the first positioning groove 131 includes a first groove opening 1311, a first groove bottom 1312 disposed opposite to the first groove opening 1311, and a first groove wall 1313 located between the first groove opening 1311 and the first groove bottom 1312; the first groove wall 1313 includes a vertically disposed straight wall section 13131, which is used to abut and limit the first positioning protrusion 220.

[0084] After the first positioning protrusion 220 is inserted into the first positioning groove 131, when the first insulating member 200 has a tendency to rotate in a plane relative to the cover plate body 100, the first positioning protrusion 220 will abut against the straight wall section 13131. Since the straight wall section 13131 is vertically arranged, after the first positioning protrusion 220 abuts against the straight wall section 13131, it does not slide up or down, but can remain stably stationary under the blocking effect of the straight wall section 13131, thereby achieving the function of anti-torsion positioning.

[0085] In some embodiments, the first positioning protrusion 220 is clearance-fitted with the first positioning groove 131, and the gap distance (hereinafter referred to as the gap amount) between the sidewall of the first positioning protrusion 220 and the adjacent straight wall section 13131 is 0.05mm.

[0086] For example, the first protrusion 140 and the recess 320 are also in clearance fit, and the clearance between the first protrusion 140 and the recess 320 can also be 0.05mm.

[0087] If the gap is too large, the first positioning protrusion 220 will have too much room to move within the first positioning groove 131, and the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131 will be reduced accordingly. If the gap is too small, the positional accuracy of the first positioning protrusion 220 and the first positioning groove 131 may make it difficult to achieve a plug-in fit between the first positioning protrusion 220 and the first positioning groove 131.

[0088] To avoid the above problems, this embodiment limits the gap to 0.05mm, which can ensure the reliability of anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131, and reduce the difficulty of plugging and assembling the first positioning protrusion 220 and the first positioning groove 131. This helps to ensure the yield rate of the cover plate assembly and is beneficial to mass production.

[0089] like Figure 8 and Figure 9 In some embodiments, the straight wall section 13131 transitions smoothly with the first plate surface 110.

[0090] The straight wall section 13131 and the first plate surface 110 have a smooth transition. This smooth transition section can guide the first positioning protrusion 220, making it easier for the first positioning protrusion 220 to be inserted into the first positioning groove 131.

[0091] like Figure 8 and Figure 9 In some embodiments, the straight wall section 13131 and the first groove bottom 1312 have a smooth transition.

[0092] The smooth transition between the straight wall section 13131 and the first groove bottom 1312 can prevent stress concentration between the straight wall section 13131 and the first groove bottom 1312 when the first positioning groove 131 is formed, thus preventing cracks in the cover plate body 100 and helping to ensure the safety and sealing of the battery cell including the cover plate assembly.

[0093] like Figure 8 and Figure 9 In some embodiments, the first protrusion 140 includes a first protrusion 142 away from the second plate surface 120, and a first sidewall 141 located between the first protrusion 142 and the second plate surface 120, with a smooth transition between the first sidewall 141 and the first protrusion 142.

[0094] The smooth transition between the first sidewall 141 and the first protrusion 142 ensures the forming quality of the cover plate body 100 and prevents wrinkles, deformation, or scratches on the second plate surface 120 during the processing of the cover plate body 100.

[0095] like Figure 3 In some embodiments, the groove wall of the clearance groove 320 transitions smoothly with the second insulating surface 310.

[0096] The groove wall of the recessed groove 320 and the second insulating surface 310 have a smooth transition. This smooth transition portion can guide the first protrusion 140, making it easier for the first protrusion 140 to be inserted into the recessed groove 320.

[0097] like Figure 8 and Figure 9 In some embodiments, a first rounded corner 160 is provided between the straight wall section 13131 and the first plate surface 110, and the radius of the first rounded corner 160 is 0.1mm to 5mm.

[0098] For example, the radius of the first fillet 160 is 0.5 mm to 1.5 mm.

[0099] For example, the radius of the first fillet 160 can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0100] If the radius of the first fillet 160 is too large, the first positioning protrusion 220 may easily slide out of the first positioning groove 131, which will adversely affect the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131. If the radius of the first fillet 160 is too small, it will be difficult to align the first positioning protrusion 220 with the groove opening of the first positioning groove 131, which is not conducive to the insertion and assembly between the first positioning protrusion 220 and the first positioning groove 131.

[0101] To avoid the above problems, in this embodiment, the radius of the first rounded corner 160 can be limited to 0.1mm to 5mm, so as to ensure the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131, while reducing the difficulty of the insertion and assembly between the first positioning protrusion 220 and the first positioning groove 131, which helps to improve the assembly efficiency.

[0102] like Figure 8 and Figure 9 In some embodiments, a second rounded corner 170 is provided between the first sidewall 141 and the first protrusion 142, and the radius of the second rounded corner 170 is 0.1 mm to 5 mm.

[0103] For example, the radius of the second fillet 170 is 0.5 mm to 1.5 mm.

[0104] For example, the radius of the second fillet 170 can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0105] If the radius of the second fillet 170 is too large, the material at the first positioning groove 131 may wrinkle and deform when processing the cover plate body 100; if the radius of the second fillet 170 is too small, there is a risk that the mold will scratch the second plate surface 120 when processing the cover plate body 100, which will have an adverse effect on the safety and sealing of the battery cell, including the cover plate assembly.

[0106] To avoid the above problems, in this embodiment, the radius of the second rounded corner 170 can be limited to 0.1mm to 5mm to ensure the molding quality of the cover plate body 100, thereby ensuring the safety and sealing of the battery cell including the cover plate assembly.

[0107] like Figure 9 In some embodiments, a third rounded corner 180 is provided between the straight wall section 13131 and the first groove bottom 1312, and the radius of the third rounded corner 180 is 0.1mm to 5mm.

[0108] For example, the radius of the third fillet 180 can be 0.2 mm or 0.3 mm.

[0109] For example, the radius of the third fillet 180 can be 0.1mm, 0.2mm, 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0110] If the radius of the third rounded corner 180 is too large, the first positioning protrusion 220 may easily slide out of the first positioning groove 131, which will adversely affect the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131. If the radius of the third rounded corner 180 is too small, stress concentration may occur at the third rounded corner 180, or even cracks may appear at the third rounded corner 180, which will adversely affect the safety and sealing of the battery cell, including the cover plate assembly.

[0111] To avoid the above problems, this embodiment limits the radius of the third rounded corner 180 to 0.1mm to 5mm, so as to ensure the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131, while also ensuring the molding quality of the cover plate body 100, thereby ensuring the safety and sealing of the battery cell including the cover plate assembly.

[0112] like Figure 3 In some embodiments, a fourth rounded corner 330 is provided between the groove wall of the clearance groove 320 and the second insulating surface 310, and the radius of the fourth rounded corner 330 is 0.1 mm to 5 mm.

[0113] For example, the radius of the third fillet 180 can be 0.1mm, 0.2mm, 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0114] If the radius of the fourth rounded corner 330 is too large, it may affect the molding quality and strength of the second insulating component 300. When assembling the second insulating component 300, there is a risk of breakage at the position of the relief groove 320. If the radius of the fourth rounded corner 330 is too small, it will be difficult to align the first protrusion 140 with the groove opening of the relief groove 320, which is not conducive to the insertion and assembly between the first protrusion 140 and the relief groove 320.

[0115] To avoid the above problems, in this embodiment the radius of the fourth rounded corner 330 is 0.1mm to 5mm, so as to reduce the difficulty of insertion and assembly between the first protrusion 140 and the recessed groove 320 while ensuring the molding quality and strength of the second insulating part 300, which helps to improve assembly efficiency.

[0116] like Figure 9In some embodiments, the thickness L5 of the cover plate body 100 is t, the depth L6 of the first positioning groove 131 is not greater than 3t, and the protrusion height of the first positioning protrusion 220 matches the depth of the first positioning groove 131.

[0117] For example, L6 can be 1t, 1.1t, 1.2t, 1.5t, 1.7t, 2t, 2.1t, 2.2t, 2.5t, 2.7t, or 3t. For instance, the thickness of the cover plate body 100 is 0.8mm, the depth of the first positioning groove 131 is 0.85mm, and the protrusion height of the first positioning protrusion 220 is 0.8mm.

[0118] For example, the protrusion height of the first protrusion 140 is the same as the depth of the first positioning groove 131.

[0119] If L6 is too large, the protrusion height of the first protrusion 140 will also be too large. In order to accommodate the first protrusion 140, the thickness of the second insulating part 300 with the clearance groove 320 will also be large. This will cause the cover assembly to occupy too much internal space of the housing, which will have an adverse effect on the energy density of the cell. If L6 is too small, the first positioning protrusion 220 may easily slide out of the first positioning groove 131, which will have an adverse effect on the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131.

[0120] To avoid the aforementioned problems, this embodiment limits L6 to no more than 3t, which reduces the protrusion height of the first protrusion 140, decreases the internal space occupied by the cover assembly, and increases the energy density of the battery cell. Simultaneously, it also ensures the reliability of the anti-torsion positioning between the first positioning protrusion 220 and the first positioning groove 131.

[0121] Based on the same inventive concept and in conjunction with the description of the cover plate assemblies in the above embodiments, this embodiment provides a battery cell that has the corresponding technical effects of the cover plate assemblies in the above embodiments, which will not be repeated here.

[0122] A battery cell includes a cover plate assembly as described in the various embodiments above.

[0123] The battery cell includes a bare battery cell, the tabs of which are directly or indirectly electrically connected to the connecting plate 410.

[0124] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0125] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0126] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0127] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0128] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0129] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body includes a first plate surface and a second plate surface disposed opposite to each other along a first direction. The first plate surface is formed with a first positioning groove, and the second plate surface is formed with a first protrusion corresponding to the position of the first positioning groove. The first direction is the thickness direction of the cover plate body; A first insulating element is connected to the first plate surface. The first insulating element has a first insulating surface close to the first plate surface. The first insulating surface has a protruding first positioning protrusion. The first positioning protrusion is inserted into the first positioning groove. A second insulating member is connected to the second plate surface. The second insulating member has a second insulating surface close to the second plate surface. The second insulating surface is formed with a clearance groove, which is used to accommodate the first protrusion. The electrode lead-out includes a connecting plate for connection with the electrode tab, the connecting plate being located on the side of the second insulator away from the cover plate body.

2. The cover plate assembly according to claim 1, characterized in that, The first positioning groove includes a first groove opening, a first groove bottom disposed opposite to the first groove opening, and a first groove wall located between the first groove opening and the first groove bottom; The first groove wall includes a vertically arranged straight wall section, which is used to abut and limit the first positioning protrusion.

3. The cover plate assembly according to claim 1, characterized in that, The electrode lead-out component also includes a through portion connected to the connecting plate, and the cover plate body is provided with a through hole for the through portion to pass through; the first plate surface forms two groove groups, and the two groove groups are respectively located on both sides of the through hole along the second direction, each groove group includes at least one first positioning groove, and the number and shape of the first positioning protrusion and the first positioning groove are matched; the second direction is the length direction of the cover plate body.

4. The cover plate assembly according to claim 3, characterized in that, Each of the slot groups includes a first positioning slot, which extends in a C-shape on the first plate surface, with the opening of the C-shape facing the through hole; the shape of the first positioning protrusion matches the shape of the first positioning slot.

5. The cover plate assembly according to claim 3, characterized in that, Each of the slot groups includes at least two first positioning slots, which are spaced apart along a third direction; the third direction intersects the second direction.

6. The cover plate assembly according to claim 1, characterized in that, Along the first direction, the edge of the first positioning protrusion in the orthographic projection of the first insulating surface coincides with the edge of the first insulating surface.

7. The cover plate assembly according to claim 2, characterized in that, The maximum dimension of the first positioning groove along the second direction is 5 mm to 10 mm; and / or, Along a third direction, the minimum distance between the edge of the first positioning groove and the edge of the first plate surface is not less than 3 mm; and / or, The first positioning protrusion and the first positioning groove are in clearance fit, and the distance between the sidewall of the first positioning protrusion and the adjacent straight wall segment is 0.05 mm; and / or, The thickness of the cover plate body is t, the depth of the first positioning groove is no greater than 3t, and the protrusion height of the first positioning protrusion matches the depth of the first positioning groove.

8. The cover plate assembly according to claim 2, characterized in that, The straight-wall section has a smooth transition with the first plate surface; and / or, The straight-walled section has a smooth transition with the bottom of the first trench; and / or, The first protrusion includes a first projection remote from the second plate surface, and a first sidewall located between the first projection and the second plate surface, the first sidewall smoothly transitioning to the first projection; and / or, The groove wall of the clearance groove has a smooth transition with the second insulating surface.

9. The cover plate assembly according to claim 8, characterized in that, A first rounded corner is provided between the straight wall section and the first plate surface, and the radius of the first rounded corner is 0.1 mm to 5 mm; and / or, A second rounded corner is provided between the first sidewall and the first protrusion, the radius of the second rounded corner being 0.1 mm to 5 mm; and / or, A third rounded corner is provided between the straight wall section and the bottom of the first groove, the radius of the third rounded corner being 0.1 mm to 5 mm; and / or, A fourth rounded corner is provided between the groove wall of the clearance groove and the second insulating surface, and the radius of the fourth rounded corner is 0.1 mm to 5 mm.

10. A battery cell, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 9.

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