Cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of battery cells, and discloses a cover plate assembly and a battery cell, and the cover plate assembly comprises a plate body provided with an anti-explosion valve; at least part of the insulating part is attached to the plate body, the insulating part is provided with a convex hull extending away from the plate body, and the convex hull is sunken to form a containing groove; the stop piece is contained in the containing groove, the stop piece is made of a high-temperature-resistant and electrolyte-resistant material, and the projection of the stop piece and the projection of the anti-explosion valve are not overlapped in the direction perpendicular to the plate body; the stop piece is provided with a limiting hole, the plate body extends to form a baffle, and the baffle is suitable for extending into the limiting hole to limit the stop piece to move in the direction parallel to the plane where the plate body is located. According to the cover plate assembly provided by the utility model, after thermal runaway of the battery cell occurs and the insulating part is melted, existence of the stop piece can be ensured, the cover plate assembly can be propped between the plate body and the pole group, the pole group is prevented from moving towards the side of the anti-explosion valve to shield the anti-explosion valve, an exhaust channel is ensured to be reserved between the plate body and the pole group, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cores, and in particular to a cover plate assembly and a battery core. Background Art

[0002] With the advancement of science and technology, batteries have been widely used in many fields, and battery safety has gradually become a crucial research topic in the battery field. The battery cell usually includes a shell, an end cap arranged on the shell, a pole group arranged inside the shell, and an insulating component. The insulating component plays an insulating role between the end cap and the pole group. The end cap is provided with an explosion-proof valve. When thermal runaway occurs inside the battery cell, the internal temperature can reach more than 600°C in a short time. The high-temperature and high-pressure gas generated inside the battery cell needs to be discharged from the explosion-proof valve in time to avoid the risk of explosion of the battery cell and ensure battery safety.

[0003] However, in the related technology, the insulating components are often made of plastic. When the battery cell experiences thermal runaway, the internal plastic material will quickly melt and fail. At this time, the melted insulating component loses its supporting effect on the electrode group. Under the action of high-temperature and high-pressure gas, the electrode group is likely to lose balance and drive the electrode group to move. The electrode group can easily block or clog the explosion-proof valve, so that the high-temperature and high-pressure gas inside the battery cell cannot be discharged from the explosion-proof valve in time, which can easily cause the battery cell to catch fire or even explode, posing a major safety hazard. Utility Model Content

[0004] In view of this, the utility model provides a cover plate assembly and a battery cell to solve the problem that after thermal runaway of the existing battery cell occurs, the pole group moves and easily blocks the explosion-proof valve due to the melting of the plastic parts.

[0005] In a first aspect, the utility model provides a cover plate assembly, comprising:

[0006] The plate body is provided with an explosion-proof valve;

[0007] The insulating member is at least partially disposed in close contact with the plate body, and the insulating member has a convex bump extending away from the plate body, and a receiving groove is formed in the convex bump;

[0008] A stopper is contained in the containing groove, the stopper is made of a high temperature resistant and electrolyte resistant material, and along a direction perpendicular to the plate body, the stopper and the explosion-proof valve projection do not overlap;

[0009] The stopper is provided with a limiting hole, and the plate body is extended to form a baffle, which is suitable for extending into the limiting hole to limit the movement of the stopper in a direction parallel to the plane where the plate body is located.

[0010] Beneficial effect: The cover plate assembly provided by the embodiment of the utility model is provided with a stopper, which is made of a high temperature resistant and electrolyte resistant material. In the direction perpendicular to the plate body, the stopper and the explosion-proof valve projection do not overlap, so that after the thermal runaway of the battery cell occurs and the insulating member melts, the stopper can be ensured to exist, and can be abutted between the plate body and the pole group to prevent the pole group from moving toward the explosion-proof valve side to block the explosion-proof valve, and ensure that there is an exhaust channel between the plate body and the pole group, effectively improving the exhaust and heat dissipation effect of the explosion-proof valve, and greatly improving the safety performance of the battery. In addition, the accommodating groove of the insulating member for accommodating the stopper will also lose the constraint on the stopper, so that the stopper will move in a direction parallel to the plate body, and the stopper of this embodiment is provided with a limited position hole, and the plate body is extended to form a baffle, which is suitable for extending into the limited position hole to limit the movement of the stopper in a direction parallel to the plane where the plate body is located, so that the stopper can be kept in a suitable abutting position, and the explosion-proof valve will not be blocked, and the stopper is also prevented from being ejected from the explosion-proof valve.

[0011] In an optional embodiment, in a direction parallel to the plane where the plate body is located and along the direction of the stopper toward the explosion-proof valve, the distance between the baffle plate and the inner wall of the stopper is H, and H≥0.5mm;

[0012] And / or, in a direction parallel to the plane where the plate body is located and along the direction in which the stopper moves away from the explosion-proof valve, the distance between the baffle plate and the inner wall of the stopper is G, and G≥0.5mm.

[0013] Beneficial effect: By making H≥0.5mm and G≥0.5mm, the baffle can be easily inserted into the limiting hole, thereby improving assembly efficiency and avoiding repeated trial and error assembly caused by too small a gap.

[0014] In an optional embodiment, the baffle is integrally formed with the plate body, and a baffle groove is formed in a depression on one side of the plate body. The baffle has a storage state in which it is accommodated in the baffle groove, and a stop state in which it is folded from the storage state to an angle with the plate body; and satisfies: 0.7B≤C2≤1.1B; wherein B is the depth of the baffle groove, and C2 is the thickness of the baffle.

[0015] Beneficial effect: By making the thickness C2 of the baffle satisfy 0.7B≤C2≤1.1B, it can be ensured that the baffle groove has sufficient accommodating space, and that when the baffle is in the storage state, most of the area can be hidden in the baffle groove.

[0016] In an optional embodiment, when the stopper abuts against the inner wall surface of the accommodating groove away from the plate body in a direction perpendicular to the plate body, the gap between the stopper and the plate body is t, and satisfies:

[0017] t+1mm≤0.5A≤a≤A, wherein A is the length of the baffle groove, and a is the length of the baffle extending from the surface of the plate body in a direction perpendicular to the plate body.

[0018] Beneficial effect: By making the length a of the baffle extending from the surface of the plate body in a direction perpendicular to the plate body less than or equal to the groove length A of the baffle groove, it is ensured that the baffle groove can smoothly accommodate the baffle and reduce interference. And by making the length a of the baffle extending from the surface of the plate body in a direction perpendicular to the plate body greater than or equal to the gap t+1mm between the stopper and the plate body, it is ensured that the baffle is at least partially accommodated in the limiting hole, preventing the baffle from falling out of the limiting hole.

[0019] In an optional embodiment, the depth of the baffle groove is B, and satisfies 0.25T≤B≤0.5T, where T is the thickness of the plate body;

[0020] The width of the baffle groove is C1, and satisfies 1mm≤C1≤5mm.

[0021] In an optional embodiment, the root of the baffle plate in contact with the plate body is located at one side edge of the baffle plate groove, and an R angle is formed on the side of the baffle plate groove away from the baffle plate.

[0022] Beneficial effect: By setting the R angle, the processing of the baffle can be facilitated, and the baffle can be conveniently folded from the storage state to the stop state.

[0023] In an optional embodiment, in a direction parallel to the plane where the plate body is located and along the direction of the baffle toward the explosion-proof valve, the minimum distance between the baffle and the explosion-proof valve is D, and D≥4mm is satisfied.

[0024] Beneficial effect: Since the explosion-proof valve needs to be welded to the plate body, the welding heat will cause the force change in the area near the welding position. By making the minimum distance D between the baffle and the explosion-proof valve ≥ 4mm, the force change of the baffle position caused by welding heat can be reduced. In addition, it can also prevent the force change caused by the molding process of the baffle from affecting the plate body, avoiding affecting the welding of the explosion-proof valve and the plate body, and avoiding affecting the opening pressure of the explosion-proof valve.

[0025] In an optional implementation, the limiting hole formed by the stopper is rectangular, and the length E of the rectangle satisfies: b+1mm≤E;

[0026] And / or, the width F of the rectangle satisfies: F≤2b;

[0027] Where b is the width of the baffle.

[0028] In an optional embodiment, the cover plate assembly further includes: an end plate, which is arranged on a side of the insulating member away from the plate body, and the end plate is recessed to form a paving portion suitable for accommodating the convex bump;

[0029] In a direction perpendicular to the board body, the convex hull is penetrated to form a first through hole, and the yielding portion is penetrated to form a second through hole; the limiting hole is sequentially connected with the first through hole and the second through hole.

[0030] Beneficial effect: By connecting the limiting hole with the first via hole and the second via hole in sequence, the smooth flow of the electrolyte can be ensured and the electrolyte can be prevented from accumulating in the containing tank.

[0031] In a second aspect, the utility model further provides a battery cell, comprising:

[0032] A housing having an opening;

[0033] and a cover plate assembly as described above, which is arranged to cover the opening, and the cover plate assembly and the shell are combined to form a closed cavity;

[0034] The pole group is arranged in the closed cavity. When the battery cell has thermal runaway, the pole group abuts against the stopper so that an exhaust passage is left between the pole group and the explosion-proof valve.

[0035] Because the battery includes a cover plate assembly, it has the same effect as the cover plate assembly and is not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a schematic diagram of the disassembled state of the cover assembly of the utility model in a front view;

[0038] Figure 2 for Figure 1 A partial enlarged view of

[0039] Figure 3 This is a schematic diagram of the disassembled state of the cover assembly of the utility model in an inverted perspective;

[0040] Figure 4 for Figure 3 A partial enlarged view of

[0041] Figure 5 It is a top view of the cover plate assembly of the utility model;

[0042] Figure 6 for Figure 5 Schematic diagram of the AA section;

[0043] Figure 7for Figure 6 A partial enlarged view of

[0044] Figure 8 for Figure 6 Dimensioned drawing of a partially enlarged state;

[0045] Fig. 9 for Figure 5 Schematic diagram of CC section;

[0046] Fig.10 for Figure 6 Schematic diagram of the BB section;

[0047] Fig.11 A top view of the stopper.

[0048] Description of reference numerals:

[0049] 1. Plate body; 11. Explosion-proof valve; 12. Baffle; 13. Baffle groove; 131. R angle; 15. Protective sheet; 2. Insulator; 21. Accommodating groove; 22. Bump; 23. First through hole; 3. End plate; 31. Displacement portion; 32. Second through hole; 4. Stopper; 41. Limiting hole. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0051] In the description of the present invention, 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 invention 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 invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the present invention can be understood according to specific circumstances.

[0053] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Combine the following Figures 1 to 11 , describing an embodiment of the utility model.

[0055] According to an embodiment of the present utility model, on the one hand, a cover plate assembly is provided, comprising:

[0056] The plate body 1 is provided with an explosion-proof valve 11;

[0057] The insulating member 2 is at least partially disposed in close contact with the board body 1 , and has a convex bump 22 extending away from the board body 1 , and a receiving groove 21 is formed in the convex bump 22 ;

[0058] The stopper 4 is accommodated in the accommodating groove 21. The stopper 4 is made of a high temperature resistant and electrolyte resistant material. In a direction perpendicular to the plate body 1, the stopper 4 and the explosion-proof valve 11 do not overlap in projection.

[0059] The stopper 4 is provided with a limiting hole 41 , and the plate body 1 is extended to form a baffle 12 , which is suitable for extending into the limiting hole 41 to limit the movement of the stopper 4 in a direction parallel to the plane where the plate body 1 is located.

[0060] The plate body 1 is made of metal material, for example, aluminum, aluminum alloy, steel, etc.

[0061] The baffle 12 is formed by partially folding the plate body 1 , and the baffle 12 can be integrally formed with the plate body 1 .

[0062] An explosion-proof valve 11 is provided on the board body 1. When thermal runaway occurs in the battery cell, the high-temperature and high-pressure gas generated inside the battery cell needs to be discharged from the explosion-proof valve in time.

[0063] An insulating part 2 is also provided on the side of the plate body 1 facing the pole group of the battery cell. The insulating part 2 can insulate the plate body 1 from the pole group. The insulating part 2 is made of plastic. When thermal runaway occurs in the battery cell, the insulating part 2 will quickly melt and fail. The insulating part 2 loses its support for the pole group, causing the pole group to move toward the explosion-proof valve under the action of high-temperature and high-pressure gas.

[0064] The cover plate assembly provided by the embodiment of the utility model is provided with a stopper 4, and the stopper 4 is made of a high temperature resistant and electrolyte resistant material. In the direction perpendicular to the plate body 1, the stopper 4 and the projection of the explosion-proof valve 11 do not overlap, so that after the insulating part 2 melts due to thermal runaway of the battery cell, the stopper 4 can be ensured to exist, and can abut between the plate body 1 and the pole group to prevent the pole group from moving toward the explosion-proof valve side to block the explosion-proof valve, thereby ensuring that an exhaust channel is left between the plate body 1 and the pole group, effectively improving the exhaust and heat dissipation effect of the explosion-proof valve, and greatly improving the safety performance of the battery.

[0065] In addition, the accommodating groove 21 of the insulating member 2 for accommodating the stop member 4 will also lose the constraint on the stop member 4, so that the stop member 4 will move horizontally in a direction parallel to the plate body 1. The stop member 4 of this embodiment is provided with a limiting hole 41, and the plate body 1 is extended to form a baffle 12, and the baffle 12 is suitable for extending into the limiting hole 41 to limit the movement of the stop member 4 in a direction parallel to the plane where the plate body 1 is located, so that the stop member 4 can be maintained in a suitable abutment position, and the explosion-proof valve 11 will not be blocked, and the stop member 4 can also be prevented from being ejected from the explosion-proof valve 11.

[0066] When thermal runaway occurs, the pole group will move toward the plate body 1 driven by the gas pressure, which can tighten the stopper 4 to prevent the baffle 12 from escaping from the limiting hole 41 .

[0067] The stopper 4 is made of a high temperature resistant and electrolyte resistant material, such as ceramics, aluminum alloy, etc., which can ensure that the stopper 4 has a certain strength.

[0068] The shape of the stopper 4 is not limited. For example, the cross section of the stopper 4 can be square, rectangular, T-shaped, cross-shaped, I-shaped, etc.

[0069] Optionally, multiple stop blocks can be provided at multiple positions between the plate body 1 and the pole group to achieve a better supporting effect. Correspondingly, the number of baffles 12 can also be multiple. Thus, the baffle 12 is placed in the limiting hole 41 of the stopper 4 to prevent the stopper 4 from moving after the insulating member 2 melts.

[0070] Optionally, the stopper 4 is accommodated in the receiving groove 21, which can be set at any position of the insulating member 2. Preferably, the stopper 4 does not overlap with the projection of the explosion-proof valve 11. If the stopper 4 overlaps with the projection of the explosion-proof valve 11, it is necessary to ensure that the width of the stopper 4 is greater than the opening width of the explosion-proof valve, so as to prevent the stopper 4 from being ejected from the explosion-proof valve 11.

[0071] In some embodiments, in combination Figure 8As shown, in a direction parallel to the plane where the plate body 1 is located and along the direction of the stopper 4 toward the explosion-proof valve 11, the distance between the baffle 12 and the inner wall of the stopper 4 is H, and H≥0.5mm;

[0072] And / or, in a direction parallel to the plane where the plate body 1 is located and along the direction where the stopper 4 is away from the explosion-proof valve 11, the distance between the baffle plate 12 and the inner wall of the stopper 4 is G, and G≥0.5 mm is satisfied.

[0073] By making H≥0.5mm and G≥0.5mm, the baffle 12 can be easily inserted into the limiting hole 41, thereby improving assembly efficiency and avoiding repeated trial-and-error assembly caused by too small a gap.

[0074] In addition, after the battery has thermal runaway, the insulating member 2 melts, causing the accommodating groove 21 to lose the limit on the stop member 4. At this time, even if the stop member 4 moves toward the direction of the explosion-proof valve 11, the baffle 12 can still be placed in the limiting hole 41 to limit the stop member 4 and prevent the stop member 4 from displacing too much and shielding the explosion-proof valve 11. Optionally, when the baffle 12 abuts against the inner wall of the stop member 4 at any position, it can be ensured that the projection of the stop member 4 and the explosion-proof valve 11 do not overlap along the direction perpendicular to the plate body 1.

[0075] In some embodiments, in combination Figure 8 As shown, the baffle 12 is integrally formed with the plate body 1, and a baffle groove 13 is formed on one side of the plate body 1 located at a depression. The baffle 12 has a storage state accommodated in the baffle groove 13, and can be folded from the storage state to a stop state set at an angle to the plate body 1; and satisfies: 0.7B≤C2≤1.1B; wherein B is the groove depth of the baffle groove 13, and C2 is the thickness of the baffle 12.

[0076] When the baffle 12 is in the stopping state, the entire cover assembly occupies a large space, which is not convenient for batch transportation and storage. By forming a baffle groove 13 on the side of the plate body 1 located at the baffle 12, the baffle 12 can be stored in the baffle groove 13, thereby reducing the space occupied by the entire cover assembly and facilitating transportation and storage.

[0077] By making the thickness C2 of the baffle plate 12 satisfy 0.7B≤C2≤1.1B, it can be ensured that the baffle plate groove 13 has sufficient accommodating space, and that when the baffle plate 12 is in the stored state, most of the area can be hidden in the baffle plate groove 13.

[0078] In some embodiments, in combination Figure 8 As shown, when the stopper 4 abuts against the inner wall surface of the accommodating groove 21 away from the plate body 1 along the direction perpendicular to the plate body 1, the gap between the stopper 4 and the plate body 1 is t, and satisfies:

[0079] t+1mm≤0.5A≤a≤A, wherein A is the groove length of the baffle groove 13 , and a is the length of the baffle 12 extending from the surface of the plate body 1 in a direction perpendicular to the plate body 1 .

[0080] By making the length a of the baffle 12 extending from the surface of the plate body 1 in a direction perpendicular to the plate body 1 less than or equal to the groove length A of the baffle groove 13, it is ensured that the baffle groove 13 can smoothly accommodate the baffle 12 and reduce interference.

[0081] By ensuring that the length a of the baffle 12 extending from the surface of the plate body 1 in a direction perpendicular to the plate body 1 is greater than or equal to the gap t+1mm between the stopper 4 and the plate body 1, it can be ensured that the baffle 12 is at least partially accommodated in the limiting hole 41, preventing the baffle 12 from escaping from the limiting hole 41.

[0082] In some embodiments, in combination Figure 8 As shown, the depth of the baffle groove 13 is B, and satisfies 0.25T≤B≤0.5T, where T is the thickness of the plate body 1;

[0083] The width of the baffle groove 13 is C1, and satisfies 1 mm ≤ C1 ≤ 5 mm.

[0084] In some embodiments, in combination Figure 7 As shown, the root of the baffle plate 12 in contact with the plate body 1 is located at one side edge of the baffle plate groove 13 , and an R angle 131 is formed on the side of the baffle plate groove 13 away from the baffle plate 12 .

[0085] The R angle 131 can be provided to facilitate the processing of the baffle 12 and to facilitate the folding of the baffle 12 from the storage state to the stop state.

[0086] In some embodiments, in combination Figure 8 As shown, in a direction parallel to the plane where the plate body 1 is located and along the direction of the baffle 12 toward the explosion-proof valve 11, the minimum distance between the baffle 12 and the explosion-proof valve 11 is D, and D≥4mm is satisfied.

[0087] Since the explosion-proof valve 11 needs to be fixed to the plate body 1 by welding, the welding heat will cause the stress change in the area near the welding position. By making the minimum spacing D between the baffle 12 and the explosion-proof valve 11 ≥ 4mm, the stress change of the baffle 12 position caused by the welding heat can be reduced. In addition, it can also prevent the stress change caused by the molding process of the baffle 12 from affecting the plate body 1, avoiding affecting the welding of the explosion-proof valve and the plate body 1, and avoiding affecting the opening pressure of the explosion-proof valve.

[0088] In some embodiments, in combination Fig. 9 , Fig.11 As shown, the limiting hole 41 formed in the stopper 4 is rectangular, and the length E of the rectangle satisfies: b+1mm≤E;

[0089] And / or, the width F of the rectangle satisfies: F≤2b;

[0090] Wherein, b is the width of the baffle 12 .

[0091] The shape of the limiting hole 41 formed in the stopper 4 can be circular, elliptical, triangular, etc.

[0092] In this embodiment, taking the limiting hole 41 formed by the stopper 4 as a rectangle as an example, the length E of the rectangle is limited to satisfy b+1mm≤E, and the width F of the rectangle satisfies F≤2b; thereby ensuring that the baffle 12 can smoothly extend into the limiting hole 41.

[0093] In some embodiments, in combination Figure 1 As shown, the cover plate assembly further includes: an end plate 3, which is arranged on the side of the insulating member 2 facing away from the plate body 1, and the end plate 3 is recessed to form a paving portion 31 suitable for accommodating the convex bump 22;

[0094] In a direction perpendicular to the board body 1 , the convex bump 22 is penetrated by a first through hole 23 , and the clearance portion 31 is penetrated by a second through hole 32 ; the limiting hole 41 is sequentially connected to the first through hole 23 and the second through hole 32 .

[0095] By sequentially connecting the limiting hole 41 with the first through hole 23 and the second through hole 32 , it is possible to ensure smooth flow of the electrolyte and prevent the electrolyte from accumulating in the containing tank 21 .

[0096] According to an embodiment of the present utility model, on the other hand, a battery cell is provided, comprising:

[0097] A housing having an opening;

[0098] and a cover plate assembly as described above, which is arranged to cover the opening, and the cover plate assembly and the shell are combined to form a closed cavity;

[0099] The electrode group is arranged in the sealed cavity. When the battery cell has thermal runaway, the electrode group abuts against the stopper 4 so that an exhaust passage is left between the electrode group and the explosion-proof valve 11 .

[0100] In the battery cell provided by the embodiment of the utility model, when thermal runaway occurs in the battery cell, the pole group abuts against the stopper 4 so that an exhaust channel is left between the pole group and the explosion-proof valve 11. By setting the stopper 4, the stopper 4 is made of a high temperature resistant and electrolyte resistant material, and the projections of the stopper 4 and the explosion-proof valve 11 do not overlap in a direction perpendicular to the plate body 1. Therefore, after the insulating part 2 melts due to thermal runaway of the battery cell, the stopper 4 can be ensured to exist and abut between the plate body 1 and the pole group to prevent the pole group from moving toward the explosion-proof valve side to block the explosion-proof valve, thereby ensuring that an exhaust channel is left between the plate body 1 and the pole group, effectively improving the exhaust and heat dissipation effect of the explosion-proof valve, and greatly improving the safety performance of the battery.

[0101] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A cover plate assembly, characterized in that: include: The plate body is provided with an explosion-proof valve; An insulating member, at least partially disposed in close contact with the plate body, the insulating member having a convex bump extending away from the plate body, and a receiving groove formed in a recess in the convex bump; A stopper, contained in the containing groove, the stopper is made of a high temperature resistant and electrolyte resistant material, and along a direction perpendicular to the plate body, the stopper and the explosion-proof valve projection do not overlap; The stopper is provided with a limiting hole, and the plate body is extended to form a baffle, which is suitable for extending into the limiting hole to limit the movement of the stopper in a direction parallel to the plane where the plate body is located.

2. The cover plate assembly according to claim 1, characterized in that: In a direction parallel to the plane where the plate body is located and along the direction of the stopper toward the explosion-proof valve, the distance between the baffle plate and the inner wall of the stopper is H, and H≥0.5mm; And / or, in a direction parallel to the plane where the plate body is located and along the direction in which the stopper moves away from the explosion-proof valve, the distance between the baffle plate and the inner wall of the stopper is G, and G≥0.5 mm is satisfied.

3. The cover plate assembly according to claim 1, characterized in that: The baffle is integrally formed with the plate body, and the plate body is located on one side of the baffle and is recessed to form a baffle groove. The baffle has a storage state in which it is accommodated in the baffle groove, and can be folded from the storage state to a stop state set at an angle to the plate body; and satisfies: 0.7B≤C2≤1.1B; wherein B is the groove depth of the baffle groove, and C2 is the thickness of the baffle.

4. The cover plate assembly according to claim 3, characterized in that: When the stopper abuts against the inner wall surface of the accommodating groove on the side away from the plate body along the direction perpendicular to the plate body, the gap between the stopper and the plate body is t, and satisfies: t+1mm≤0.5A≤a≤A, wherein A is the groove length of the baffle groove, and a is the length of the baffle extending from the surface of the plate body in a direction perpendicular to the plate body.

5. The cover plate assembly according to claim 3, characterized in that: The depth of the baffle groove is B, and satisfies 0.25T≤B≤0.5T, where T is the thickness of the plate body; The width of the baffle groove is C1, and satisfies 1mm≤C1≤5mm.

6. The cover plate assembly according to claim 3, characterized in that: The root of the baffle plate in contact with the plate body is located at one side edge of the baffle plate groove, and a side of the baffle plate groove away from the baffle plate forms an R angle.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that: In a direction parallel to the plane where the plate body is located and along the direction of the baffle toward the explosion-proof valve, the minimum distance between the baffle and the explosion-proof valve is D, and D≥4mm is satisfied.

8. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The limiting hole formed by the stopper is rectangular, and the length E of the rectangle satisfies: b+1mm≤E; And / or, the width F of the rectangle satisfies: F≤2b; Wherein, b is the width of the baffle.

9. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The cover plate assembly further comprises: an end plate, which is arranged on a side of the insulating member away from the plate body, and the end plate is concavely formed with a yielding portion suitable for accommodating the convex bump; In a direction perpendicular to the plate body, the convex bump is penetrated to form a first through hole, and the relinquishing portion is penetrated to form a second through hole; the limiting hole is sequentially connected with the first through hole and the second through hole.

10. A battery cell, characterized in that: include: A housing having an opening; and a cover plate assembly as claimed in any one of claims 1 to 9, which is arranged to cover the opening, wherein the cover plate assembly and the shell are combined to form a closed cavity; The pole group is arranged in the closed cavity. When the battery cell has thermal runaway, the pole group abuts against the stopper so that an exhaust passage is left between the pole group and the explosion-proof valve.

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