Cover plate assembly and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery, the cover plate assembly comprises a cover plate, a high-temperature-resistant insulating part and lower plastic, the lower plastic is arranged on one side, close to a pole core, of the cover plate, the high-temperature-resistant insulating part is arranged between the lower plastic and the cover plate, and a fracturing groove is formed in the lower plastic. Therefore, the cracking groove is formed in the lower plastic, and when high-temperature thermal runaway occurs in the battery cell, the cracking groove, namely the notch, at the weak part can fall off in time, so that the lower plastic is in contact with the pole core and wraps the pole core, and the phenomenon that the explosion-proof valve hole in the cover plate is blocked to affect pressure relief can be avoided, that is, normal pressure relief during thermal runaway can be ensured; furthermore, under the condition that high-temperature thermal runaway occurs in the battery cell, the high-temperature-resistant insulating part cannot be melted, still shields between the pole core and the cover plate, and still can play an insulating role, so that the thermal runaway of the battery cannot be aggravated, and the safety performance of the battery is improved.

Description

Technical Field

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

[0002] Currently, the battery's internal core is connected to the positive and negative terminals on the cover plate to guide the internal current to the outside. The cover plate and the core are isolated and insulated by plastic components. When the battery is abused and thermal runaway occurs, high temperatures will be generated inside, which will melt the plastic components. At this time, the insulation function will fail, and the positive and negative terminals will short-circuit, which will aggravate thermal runaway and result in poor safety. Utility Model Content

[0003] The purpose of this application is to provide a cover plate assembly and a battery, which to a certain extent solves the technical problems existing in the prior art, such as the high temperature generated inside the battery during thermal runaway due to battery abuse, which melts the plastic parts, causing the insulation function to fail and the positive and negative electrodes to short-circuit, thus aggravating thermal runaway and resulting in poor safety.

[0004] This application provides a cover plate assembly, including: a cover plate, a high-temperature resistant insulating component, and a lower plastic; wherein, the lower plastic is disposed on the side of the cover plate near the electrode core, the high-temperature resistant insulating component is disposed between the lower plastic and the cover plate, and the lower plastic has a fracturing groove, so that when high-temperature thermal runaway occurs inside the battery, the lower plastic cracks and falls off along the fracturing groove and wraps around the end of the electrode core. At the same time, the high-temperature resistant insulating component can still shield between the electrode core and the cover plate, so that the cover plate and the electrode core are insulated from each other.

[0005] In the above technical solution, the lower plastic is further provided with an exhaust groove, and the groove wall of the exhaust groove is provided with an exhaust through hole; the fracturing groove includes a primary fracturing groove and a secondary fracturing groove, and the primary fracturing groove is formed on the structure of the lower plastic outside the exhaust groove, and the secondary fracturing groove is formed on the groove wall of the exhaust groove.

[0006] In any of the above technical solutions, further, along the thickness direction of the lower plastic, the inner wall and outer wall of the venting groove are each formed with corresponding secondary fracturing grooves.

[0007] In any of the above technical solutions, further, along the thickness direction of the lower plastic, the thickness of the outer structure of the bottom wall of the primary fracturing groove is A, and the wall thickness of the structure between the bottom walls of the secondary fracturing grooves on opposite sides of the lower plastic is a, and A>a.

[0008] In any of the above technical solutions, further, along the thickness direction of the lower plastic, the primary fracturing groove is formed on the side of the lower plastic near the electrode core.

[0009] In any of the above technical solutions, further, along the second preset direction, the cross-section of the primary fracturing groove is trapezoidal.

[0010] In any of the above technical solutions, further, along the second preset direction, the cross-section of the secondary fracturing groove is semi-circular.

[0011] In any of the above technical solutions, further, along the third preset direction, the primary fracturing grooves are provided at intervals on both opposite sides of the exhaust groove.

[0012] In any of the above technical solutions, the high-temperature resistant insulating component is further connected to the cover plate, and the lower plastic is detachably connected to the high-temperature resistant insulating component.

[0013] In any of the above technical solutions, the lower plastic is further provided with a buckle, and the high-temperature resistant insulating component is provided with a groove.

[0014] In any of the above technical solutions, further, the slot includes a trapezoidal slot and a rectangular slot connected together, and the rectangular slot is disposed near the cover plate side; both the trapezoidal slot and the rectangular slot extend along a first preset direction and along a direction perpendicular to the first preset direction, the cross-section of the trapezoidal slot is trapezoidal, and the width of the short side of the cross-section of the trapezoidal slot is α1, the width of the long side of the cross-section of the trapezoidal slot is α2, the cross-section of the rectangular slot is rectangular, and the width of the cross-section of the rectangular slot is α3, the depth of the cross-section of the rectangular slot is L1; wherein, L1=L2, θ1<θ2≤α1, α1<θ3≤α3;

[0015] The buckle includes a trapezoidal portion and a rectangular portion connected together, and the rectangular portion is connected to the lower plastic part; both the trapezoidal portion and the rectangular portion extend along the first preset direction and along a direction perpendicular to the first preset direction. The cross-section of the trapezoidal portion is trapezoidal, and the width of the short side of the cross-section of the trapezoidal portion is θ1, the width of the long side of the cross-section of the trapezoidal portion is θ3, and the height of the cross-section of the trapezoidal portion is L2. The cross-section of the rectangular portion is rectangular, and the width of the cross-section of the rectangular portion is θ2; wherein, L1=L2, θ1<θ2≤α1, α1<θ3≤α3.

[0016] In any of the above technical solutions, the cover plate is further provided with a mounting groove, and the high-temperature resistant insulating component is disposed in the mounting groove.

[0017] In any of the above technical solutions, the cover plate is further provided with a liquid guiding protrusion extending along its thickness direction, and the end of the liquid guiding protrusion extends into the mounting groove. Along the thickness direction of the cover plate, there is a height difference between the end of the liquid guiding protrusion located in the mounting groove and the bottom wall of the mounting groove. The liquid guiding protrusion is provided with an injection hole, and the injection hole extends along the thickness direction of the cover plate and connects the inner side and the outer side of the cover plate.

[0018] In any of the above technical solutions, further, along the thickness direction of the cover plate, the depth of the mounting groove is h, the thickness of the cover plate is H, and h = 1 / 2H.

[0019] In any of the above technical solutions, further, along the second preset direction, the fracturing groove extends through the opposite sides of the lower plastic.

[0020] In any of the above technical solutions, the high-temperature resistant insulating component is further connected to the cover plate by a hot-melt embedding process.

[0021] In any of the above technical solutions, further, auxiliary venting grooves are formed at both ends of the lower plastic along its length direction, and auxiliary venting through holes are formed on the groove walls of the auxiliary venting grooves.

[0022] In any of the above technical solutions, the cover plate is a rectangular plate, and the high-temperature resistant insulating component is a rectangular sheet.

[0023] This application also provides a battery, including an electrode core, a housing, and a cover assembly as described in any of the above-described technical solutions, wherein the electrode core is installed inside the housing, and the cover assembly seals the opening of the housing. Therefore, it possesses all the beneficial technical effects of this cover assembly, which will not be elaborated further here.

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

[0025] The cover assembly provided in this application can be used in batteries. A cracking groove is set on the lower plastic. When high-temperature thermal runaway occurs inside the cell, the cracking groove, i.e., the gap, at the weak point will fall off in time, allowing the lower plastic to contact and wrap the electrode core. This can prevent the explosion-proof valve hole on the cover from being blocked and affecting pressure relief. In other words, it can ensure normal pressure relief during thermal runaway, thereby improving the safety and reliability of the battery during use. Furthermore, when high-temperature thermal runaway occurs inside the cell, the high-temperature resistant insulating component will not melt and will still shield between the electrode core and the cover, still playing an insulating role and not aggravating the thermal runaway of the battery, thus improving the safety performance of the battery. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application;

[0029] Figure 3 This is another structural schematic diagram of the cover plate assembly provided in an embodiment of this application;

[0030] Figure 4 A cross-sectional view of the cover plate assembly provided in an embodiment of this application;

[0031] Figure 5 for Figure 4 A magnified structural diagram at point A;

[0032] Figure 6 This is a schematic diagram of the lower plastic structure provided in an embodiment of this application;

[0033] Figure 7 for Figure 6 A magnified structural diagram at point B;

[0034] Figure 8 for Figure 6 A magnified structural diagram at point C;

[0035] Figure 9 for Figure 6 A magnified structural diagram at point D;

[0036] Figure 10 This is a schematic diagram of the structure of the high-temperature resistant insulating component provided in the embodiments of this application;

[0037] Figure 11 A cross-sectional view of a high-temperature resistant insulating component provided in an embodiment of this application;

[0038] Figure 12 for Figure 11 A magnified structural diagram at point E;

[0039] Figure 13 This is a schematic diagram of the lower plastic structure provided in an embodiment of this application;

[0040] Figure 14 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application;

[0041] Figure 15 A cross-sectional view of the cover plate provided in an embodiment of this application;

[0042] Figure 16 This is a partial enlarged view of the cover plate provided in an embodiment of this application;

[0043] Figure 17 This is another structural schematic diagram of the lower plastic provided in an embodiment of this application;

[0044] Figure 18 for Figure 17 A magnified structural diagram at point G;

[0045] Figure 19 This is another structural schematic diagram of the lower plastic provided in the embodiments of this application;

[0046] Figure 20 for Figure 19 A magnified structural diagram at point H;

[0047] Figure 21 This is another structural schematic diagram of the cover plate provided in an embodiment of this application.

[0048] Figure label:

[0049] 1-Cover plate, 11-Mounting groove, 111-Bottom wall, 12-Liquid guiding protrusion, 121-End, 13-Injection hole, 2-High temperature resistant insulating component, 21-Card slot, 211-Trapezoidal groove, 212-Rectangular groove, 22-Pole column through hole, 23-Auxiliary injection hole, 24-Explosion-proof valve vent hole, 3-Lower plastic, 31-Snap fastener, 311-Trapezoidal part, 312-Rectangular part, 32-Ventilation groove, 33-Ventilation through hole, 34-Fracturing groove, 341-Primary fracturing groove, 342-Secondary fracturing groove, 35-Auxiliary venting groove, 36-Auxiliary venting through hole, 10-Cover plate assembly, 20-Housing shell. Detailed Implementation

[0050] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0051] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0052] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0053] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] The following reference Figures 1 to 20 This application describes a cover plate assembly and a battery according to some embodiments thereof.

[0056] Example 1

[0057] See Figures 1 to 5 As shown, an embodiment of this application provides a cover plate assembly 10, including: a cover plate 1, a high-temperature resistant insulating member 2, and a lower plastic 3; wherein, the lower plastic 3 is disposed on the side of the cover plate 1 near the electrode core, the high-temperature resistant insulating member 2 is disposed between the lower plastic 3 and the cover plate 1, and the lower plastic 3 is formed with a cracking groove 34, so that when high-temperature thermal runaway occurs inside the battery, the lower plastic 3 decomposes and falls off along the cracking groove 34 and wraps around the end of the electrode core. At the same time, the high-temperature resistant insulating member 2 can still shield between the electrode core and the cover plate 1, so that the cover plate 1 and the electrode core are insulated.

[0058] As can be seen from the structure described above, a fracturing groove 34 is provided on the lower plastic 3. When high-temperature thermal runaway occurs inside the cell, the fracturing groove 34, i.e. the gap, at the weak point will crack and fall off in time, so that the lower plastic 3 contacts and wraps the electrode core. This can prevent the explosion-proof valve hole on the cover plate 1 from being blocked and affecting the pressure relief. In other words, it can ensure normal pressure relief during thermal runaway, thereby improving the safety and reliability of the battery during use. Furthermore, when high-temperature thermal runaway occurs inside the cell, the high-temperature resistant insulating component 2 will not melt and will still shield between the electrode core and the cover plate 1, still playing an insulating role. This will not aggravate the thermal runaway of the battery and improve the safety performance of the battery.

[0059] In this embodiment, preferably, as follows: Figures 17 to 20 As shown, the lower plastic 3 has an venting groove 32, and the groove wall of the venting groove 32 has an venting through hole 33; the fracturing groove 34 includes a primary fracturing groove 341 and a secondary fracturing groove 342, and the primary fracturing groove 341 is formed on the structure of the lower plastic 3 outside the venting groove 32, and the secondary fracturing groove 342 is formed on the groove wall of the venting groove 32.

[0060] As can be seen from the structure described above, when thermal runaway occurs inside the battery cell, the primary fracturing groove 341 and the secondary fracturing groove 342 work together to make the lower plastic structure in the area below the explosion-proof valve more likely to decompose and fall off, and then quickly wrap around the end of the electrode core, thereby preventing the explosion-proof valve hole on the cover plate 1 from being blocked.

[0061] It should be noted that the structure is not limited to the simultaneous existence of the primary fracturing groove 341 and the secondary fracturing groove 342. Alternatively, the primary fracturing groove 341 may be provided only on the lower plastic 3, or the secondary fracturing groove 342 may be designed only on the lower plastic 3, depending on the actual needs.

[0062] In this embodiment, preferably, as follows: Figures 1 to 3 As shown, along the thickness direction of the lower plastic 3, the inner and outer walls of the venting groove 32 are both provided with corresponding secondary fracturing grooves 342. That is to say, the inner and outer bottom walls of the venting groove 32 are both provided with corresponding secondary fracturing grooves 342.

[0063] As can be seen from the structure described above, a secondary pyrolysis groove is set on both the inner and outer walls of the exhaust groove 32 to further reduce the strength of this location, so that when thermal runaway occurs inside the battery cell, this location can be pyrolyzed and detached in time.

[0064] Furthermore, preferably, the exhaust groove 32 is arranged to protrude toward the pole core side, but of course, it is not limited to this.

[0065] It should be noted that: the secondary fracturing grooves 342 are not limited to being provided on both the inner and outer walls of the venting groove 32 along the thickness direction of the lower plastic 3. Alternatively, the secondary fracturing grooves 342 may be provided only on the inner wall of the venting groove 32 or only on the outer wall of the venting groove 32. The specific choice depends on the actual needs.

[0066] In addition, it should be noted that: it is not limited to the above structure, but secondary fracturing grooves 342 may also be provided only on the side wall of the venting groove 32 or on both the side wall and the bottom wall of the venting groove 32, depending on the actual needs.

[0067] In this embodiment, preferably, as follows: Figure 8 and Figure 9As shown, along the thickness direction of the lower plastic 3, the thickness of the outer structure of the bottom wall of the primary fracturing groove 341 is A, and the wall thickness of the structure between the bottom walls of the secondary fracturing grooves 342 on opposite sides of the lower plastic 3 is a, and A>a.

[0068] Based on the structure described above, it can be seen that the thickness A of the outer structure of the bottom wall of the primary fracturing groove 341 is greater than the wall thickness a of the structure between the bottom walls of the secondary fracturing grooves 342 on both sides of the lower plastic 3. When the battery experiences thermal runaway and rapid internal gas generation, the secondary fracturing groove 342 must first decompose and detach to make the opening in the middle large enough. Then, in conjunction with the decomposition of the primary fracturing groove 341, the lower plastic structure in the area below the explosion-proof valve decomposes and detaches in time, avoiding blockage of the explosion-proof valve orifice, thereby allowing the explosion-proof valve to open and release pressure in time.

[0069] In this embodiment, preferably, as follows: Figure 3 As shown, along the second preset direction, the primary fracturing groove 341 penetrates through the opposite sides of the lower plastic 3.

[0070] As can be seen from the structure described above, the primary fracturing groove 341 runs through both sides of the lower plastic 3, which makes it easier for the cell to decompose and detach when thermal runaway occurs inside. Of course, it is not limited to this. The primary fracturing groove 341 may only run through one side of the lower plastic 3, or neither side of the primary fracturing groove 341 may run through both ends of the lower plastic 3. The specific choice depends on the actual needs.

[0071] Furthermore, preferably, the second preset direction described here and below is the width direction of the lower plastic 3. Of course, it is not limited to this. The second preset direction can also be a direction that forms an angle with the width direction of the lower plastic 3, depending on the actual needs.

[0072] In this embodiment, preferably, as follows: Figure 18 and Figure 20 As shown, along the second preset direction, the secondary fracturing groove 342 penetrates the opposite side walls of the venting groove 32.

[0073] As can be seen from the structure described above, the secondary fracturing groove 342 penetrates both sides of the venting groove 32, which makes it easier for the cell to decompose and detach when thermal runaway occurs inside. Of course, it is not limited to this. The secondary fracturing groove 342 may only penetrate one side of the venting groove 32, or neither side of the secondary fracturing groove 342 may penetrate both sides of the venting groove 32. The specific choice depends on the actual needs.

[0074] In this embodiment, preferably, as follows: Figure 18 and Figure 20As shown, the inner and outer walls of the venting groove 32 are provided with two secondary fracturing grooves 342, that is, there are a total of four secondary fracturing grooves 342. Of course, it is not limited to this. The inner and outer walls of the venting groove 32 may also be provided with only one secondary fracturing groove 342 or more than two secondary fracturing grooves 342, such as three or four, etc.

[0075] In this embodiment, preferably, as follows: Figure 3 and Figure 19 As shown, along the thickness direction of the lower plastic 3, a primary fracturing groove 341 is formed on the side of the lower plastic 3 near the electrode core.

[0076] As can be seen from the structure described above, placing the primary fracturing groove 341 on the side of the lower plastic 3 closer to the electrode core makes it easier for the lower plastic 3 to decompose during thermal runaway inside the cell, thus facilitating its wrapping around the end of the electrode core. Of course, this is not the only option; the primary fracturing groove 341 can also be formed on the side of the lower plastic 3 away from the electrode core, depending on the specific needs.

[0077] In this embodiment, preferably, as follows: Figure 8 As shown, along the second preset direction, the cross-section of the first-stage fracturing groove 341 is trapezoidal. The notch formed by the trapezoidal groove 211 is relatively large, which facilitates the rupture during thermal runaway inside the battery and allows it to fall off in time. This allows the lower plastic 3 to contact and wrap the electrode core, preventing the explosion-proof valve hole on the cover plate 1 from being blocked, which would affect the pressure relief and the ejection of the electrode from the explosion-proof hole. In other words, it can ensure normal pressure relief during thermal runaway, thereby improving the safety and reliability of the battery during use.

[0078] In this embodiment, preferably, as follows: Figure 9 As shown, along the second preset direction, the cross-section of the secondary fracturing groove 342 is semi-circular. Compared with the trapezoidal groove 211, it has a simple structure, is easy to process and manufacture, and occupies little space. It is suitable for processing on the limited area of ​​the venting groove 32. Of course, the structure of the secondary fracturing groove 342 is not limited to the above. It can also be designed according to actual needs. For example, along the second preset direction, the cross-section of the secondary fracturing groove 342 is square, etc.

[0079] In this embodiment, preferably, as follows: Figure 3 and Figure 19 As shown, along the third preset direction, primary fracturing grooves 341 are formed on both sides of the exhaust groove 32. This ensures that when the battery cell experiences thermal runaway, the lower plastic structure between the two primary fracturing grooves 341, i.e. the lower plastic structure below the explosion-proof valve, can quickly decompose and fall off. The fallen lower plastic structure can cover the electrode core structure at the corresponding explosion-proof valve hole, thereby avoiding blocking the explosion-proof valve hole on the cover plate 1.

[0080] Furthermore, preferably, the third preset direction is the length direction of the lower plastic 3. That is, along the length direction of the lower plastic 3, primary fracturing grooves 341 are provided on both sides of the venting groove 32 (it should be noted that the venting groove 32 is preferably provided along the width direction of the lower plastic 3, but it is not limited to this). The primary fracturing grooves 341 on each side are spaced apart from the venting groove 32, making full use of the area along the length direction of the lower plastic 3, making the layout more reasonable. Of course, it is not limited to the above. Primary fracturing grooves 341 can also be provided only on one side of the venting groove 32. In addition, it should be noted that the third preset direction is not limited to the above and can also be designed according to actual needs.

[0081] Furthermore, preferably, along the third preset direction, each of the opposite sides of the venting groove 32 is provided with a primary fracturing groove 341. Of course, it is not limited to this. Along the third preset direction, each of the opposite sides of the venting groove 32 may also be provided with multiple primary fracturing grooves 341, such as two or three, etc., depending on the actual needs.

[0082] In this embodiment, preferably, as follows: Figure 6 As shown, the high-temperature resistant insulating component 2 is connected to the cover plate 1, and the lower plastic 3 is detachably connected to the high-temperature resistant insulating component 2.

[0083] As can be seen from the structure described above, during assembly, the high-temperature resistant insulating component 2 can be fixedly connected to the cover plate 1 first, and then the lower plastic 3 can be fixed to the high-temperature resistant insulating component 2. Moreover, the lower plastic 3 and the high-temperature resistant insulating component 2 adopt a detachable connection method, which helps to improve assembly efficiency and facilitates adjustment.

[0084] In this embodiment, preferably, as follows: Figure 5 As shown, the lower plastic 3 and the high-temperature resistant insulating component 2 are connected by a buckle 31, which makes the installation process more convenient and the structure more stable and firm after installation. In addition, the buckle 31 has a simple structure and is easy to process and manufacture. Of course, it is not limited to this. The lower plastic 3 and the high-temperature resistant insulating component 2 can also be connected by bolts or adhesives, depending on the actual needs.

[0085] In this embodiment, preferably, as follows: Figures 5 to 7 , Figures 10 to 13 As shown, the lower plastic 3 has a buckle 31, and the high-temperature resistant insulating part 2 has a groove 21.

[0086] As described above, the buckle 31 and the slot 21 work together to achieve the snap-fit ​​connection between the lower plastic 3 and the high-temperature resistant insulating component 2, improving the ease of assembly. Of course, this is not the only option; the buckle 31 can also be set on the high-temperature resistant insulating component 2, and the slot 21 can be set on the lower plastic 3, depending on the actual needs.

[0087] In this embodiment, preferably, as follows: Figure 5 , Figure 7 and Figure 12 As shown, the slot 21 includes a trapezoidal slot 211 and a rectangular slot 212 connected to each other, with the rectangular slot 212 positioned closer to the cover plate 1. Both the trapezoidal slot 211 and the rectangular slot 212 extend along a first preset direction. The trapezoidal slot 211 has a trapezoidal cross-section with a short side width of α1 and a long side width of α2. The rectangular slot 212 has a rectangular cross-section with a width of α3 and a depth of L1. Where L1 = L2, θ1 < θ2 ≤ α1, and α1 < θ3 ≤ α3.

[0088] The buckle 31 includes a trapezoidal portion 311 and a rectangular portion 312 connected to each other, and the rectangular portion 312 is connected to the lower plastic 3; both the trapezoidal portion 311 and the rectangular portion 312 extend along a first preset direction and along a direction perpendicular to the first preset direction. The cross-section of the trapezoidal portion 311 is trapezoidal, and the width of the short side of the cross-section of the trapezoidal portion 311 is θ1, the width of the long side of the cross-section of the trapezoidal portion 311 is θ3, and the height of the cross-section of the trapezoidal portion 311 is L2. The cross-section of the rectangular portion 312 is rectangular, and the width of the cross-section of the rectangular portion 312 is θ2; wherein, L1=L2, θ1<θ2≤α1, α1<θ3≤α3.

[0089] As can be seen from the structure described above, the slot 21 is designed as a dovetail groove, and the buckle 31 is set as a dovetail block. This improves the stability and firmness of the two after assembly. Furthermore, setting L1 = L2, θ1 < θ2 ≤ α1, and α1 < θ3 ≤ α3 helps to ensure proper assembly, making the two fit more tightly and less likely to fall off.

[0090] Furthermore, preferably, the first preset direction is the width direction of the lower plastic 3. Of course, it is not limited to this, and it can also be a direction that is at an angle to the width direction of the lower plastic 3, depending on the actual needs.

[0091] It should be noted that the structure of the card slot 21 and the buckle 31 is not limited to the above, and can be reasonably designed according to actual needs.

[0092] In this embodiment, preferably, the high-temperature resistant insulating component 2 is connected to the cover plate 1 by a hot-melt embedding process.

[0093] As can be seen from the structure described above, the hot melt embedding process is easy to operate and is usually carried out using a hot melt machine or a manual soldering iron. It is suitable for large-scale production and automated operation, and the connection between the high-temperature resistant insulating part 2 and the cover plate 1 is more secure and stable.

[0094] It should be noted that the high-temperature resistant insulating component 2 and the cover plate 1 can also be connected by welding, gluing, bolts or clips 31, etc., instead of the hot-melt embedding process, depending on the actual needs.

[0095] In this embodiment, preferably, as follows: Figure 4 , Figures 14 to 16 As shown, the cover plate 1 has a mounting groove 11, and the high-temperature resistant insulating component 2 is disposed in the mounting groove 11.

[0096] As can be seen from the structure described above, an installation groove 11 is provided on the cover plate 1, and the high-temperature resistant insulating component 2 is further placed in this installation groove 11, which serves to limit the high-temperature resistant insulating component 2, and helps to improve the assembly accuracy and the stability and firmness of the structure after assembly.

[0097] Furthermore, preferably, along the thickness direction of the cover plate 1, the depth of the mounting groove 11 is h, the thickness of the cover plate 1 is H, and h = 1 / 2H, to ensure that the high-temperature resistant insulating component 2 has sufficient thickness to combine with the cover plate 1, thereby improving the stability and firmness of the assembly of the two.

[0098] It should be noted that the mounting groove 11 may not be provided on the cover plate 1; the choice depends on the actual needs.

[0099] In this embodiment, preferably, as follows: Figure 21 As shown, the cover plate 1 has a liquid guiding protrusion 12 extending along its thickness direction, and the end 121 of the liquid guiding protrusion 12 extends into the mounting groove 11. Along the thickness direction of the cover plate 1, there is a height difference between the end 121 of the liquid guiding protrusion 12 located in the mounting groove 11 and the bottom wall 111 of the mounting groove 11. The liquid guiding protrusion 12 has an injection hole 13, and the injection hole 13 extends along the thickness direction of the cover plate 1 and connects the inner side and the outer side of the cover plate 1.

[0100] As can be seen from the structure described above, the end 121 of the liquid guiding protrusion 12, which is also the end of the liquid injection hole 13, protrudes from the bottom wall 111 of the mounting groove 11. This serves two purposes: first, to position the high-temperature resistant insulating component 2; and second, to prevent residual liquid generated during battery injection from being scattered along the lower surface of the cover plate 1, thus avoiding liquid contamination between the lower plastic 3 and the cover plate 1.

[0101] In this embodiment, preferably, as follows: Figure 3 and Figure 17 As shown, auxiliary venting grooves 35 are formed at both ends of the lower plastic 3 along its length direction, and auxiliary venting through holes 36 are formed on the groove wall of the auxiliary venting grooves 35.

[0102] As can be seen from the structure described above, auxiliary exhaust grooves 35 are provided on both sides of the lower plastic 3 to assist in exhaust, that is, to increase the exhaust area and thus improve the exhaust effect. Of course, it is not limited to this. Auxiliary exhaust grooves 35 can also be designed only on one side of the lower plastic 3, or even not at both ends of the lower plastic 3. The specific choice depends on the actual needs.

[0103] In this embodiment, preferably, as follows: Figure 2 and Figure 10 As shown, the cover plate 1 is a rectangular plate, and preferably, the material can be aluminum. Correspondingly, the high-temperature resistant insulating part 2 is also a rectangular piece, but of course, it is not limited to this.

[0104] In this embodiment, preferably, as follows: Figure 10 As shown, the high-temperature resistant insulating component 2 needs to have structures such as pole through holes 22, auxiliary liquid injection holes 23, and explosion-proof valve exhaust holes 24. Of course, some holes can also be designed according to actual needs to serve as a means of avoidance or auxiliary exhaust, or as an auxiliary assembly structure.

[0105] In this embodiment, preferably, the high-temperature resistant insulating component 2 is made of polyetherimide. Of course, it is not limited to this, and other materials with high-temperature resistance and insulation properties can also be used.

[0106] Example 2

[0107] See Figure 1 As shown, Embodiment 2 of this application also provides a battery, including the cover assembly 10 described in Embodiment 1 above, and thus has all the beneficial technical effects of the cover assembly 10. The same technical features and beneficial effects will not be repeated here.

[0108] It should be noted that the aforementioned cover plate assembly 10 can also be installed on one open end of the housing 20, or the aforementioned cover plate assembly 10 can be installed on both open ends of the housing 20, depending on the actual needs.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate assembly, characterized in that, include: The battery comprises a cover plate, a high-temperature resistant insulating component, and a lower plastic layer. The lower plastic layer is disposed on the side of the cover plate near the electrode core, and the high-temperature resistant insulating component is disposed between the lower plastic layer and the cover plate. The lower plastic layer has a fracturing groove, so that when high-temperature thermal runaway occurs inside the battery, the lower plastic layer decomposes and falls off along the fracturing groove and wraps around the end of the electrode core. At the same time, the high-temperature resistant insulating component can still shield the electrode core and the cover plate, so that the cover plate and the electrode core are insulated from each other.

2. The cover plate assembly according to claim 1, characterized in that, The lower plastic has an venting groove, and the groove wall of the venting groove has an venting through hole; the fracturing groove includes a primary fracturing groove and a secondary fracturing groove, and the primary fracturing groove is formed on the structure of the lower plastic outside the venting groove, and the secondary fracturing groove is formed on the groove wall of the venting groove.

3. The cover plate assembly according to claim 2, characterized in that, Along the thickness direction of the lower plastic, the inner and outer walls of the venting groove are each formed with corresponding secondary fracturing grooves.

4. The cover plate assembly according to claim 3, characterized in that, Along the thickness direction of the lower plastic, the thickness of the outer structure of the bottom wall of the primary fracturing groove is A, and the wall thickness of the structure between the bottom walls of the secondary fracturing grooves on opposite sides of the lower plastic is a, and A>a.

5. The cover plate assembly according to claim 2, characterized in that, Along the thickness direction of the lower plastic, the primary fracturing groove is formed on the side of the lower plastic near the electrode core; and / or Along the second preset direction, the cross-section of the primary fracturing groove is trapezoidal; and / or Along the second preset direction, the cross-section of the secondary fracturing groove is semi-circular; and / or Along the third preset direction, the primary fracturing grooves are provided at intervals on both sides of the venting groove.

6. The cover plate assembly according to claim 1, characterized in that, The high-temperature resistant insulating component is connected to the cover plate, and the lower plastic is detachably connected to the high-temperature resistant insulating component.

7. The cover plate assembly according to claim 6, characterized in that, The lower plastic part has a buckle, and the high-temperature resistant insulating part has a groove.

8. The cover plate assembly according to claim 7, characterized in that, The slot includes a trapezoidal slot and a rectangular slot connected together, with the rectangular slot positioned close to the cover plate. Both the trapezoidal slot and the rectangular slot extend along a first preset direction, perpendicular to the first preset direction. The trapezoidal slot has a trapezoidal cross-section with a short side width of α1 and a long side width of α2. The rectangular slot has a rectangular cross-section with a width of α3 and a depth of L1. Wherein, L1 = L2, θ1 < θ2 ≤ α1, and α1 < θ3 ≤ α3. The buckle includes a trapezoidal portion and a rectangular portion connected together, and the rectangular portion is connected to the lower plastic part; both the trapezoidal portion and the rectangular portion extend along the first preset direction and along a direction perpendicular to the first preset direction. The cross-section of the trapezoidal portion is trapezoidal, and the width of the short side of the cross-section of the trapezoidal portion is θ1, the width of the long side of the cross-section of the trapezoidal portion is θ3, and the height of the cross-section of the trapezoidal portion is L2. The cross-section of the rectangular portion is rectangular, and the width of the cross-section of the rectangular portion is θ2; wherein, L1=L2, θ1<θ2≤α1, α1<θ3≤α3.

9. The cover plate assembly according to claim 1, characterized in that, The cover plate has a mounting groove, and the high-temperature resistant insulating component is disposed in the mounting groove.

10. The cover plate assembly according to claim 9, characterized in that, The cover plate has a liquid-guiding protrusion extending along its thickness direction, and the end of the liquid-guiding protrusion extends into the mounting groove. Along the thickness direction of the cover plate, there is a height difference between the end of the liquid-guiding protrusion located in the mounting groove and the bottom wall of the mounting groove. The liquid-guiding protrusion has an injection hole extending along the thickness direction of the cover plate and communicating with the inner and outer sides of the cover plate; and / or Along the thickness direction of the cover plate, the depth of the mounting groove is h, the thickness of the cover plate is H, and h = 1 / 2H.

11. The cover plate assembly according to any one of claims 1 to 10, characterized in that, Along a second predetermined direction, the fracturing groove extends through opposite sides of the lower plastic; and / or The high-temperature resistant insulating component is connected to the cover plate via a hot-melt embedding process; and / or The lower plastic material has auxiliary venting grooves formed at both ends along its length, and the walls of the auxiliary venting grooves have auxiliary venting through holes; and / or The cover plate is a rectangular plate, and the high-temperature resistant insulating component is a rectangular sheet.

12. A battery, characterized in that, It includes an electrode core, a housing, and a cover plate assembly as described in any one of claims 1 to 11; wherein the electrode core is installed inside the housing, and the cover plate assembly covers the opening of the housing.

Images