Cover plate assembly, battery and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a cover plate assembly, a battery and an electric device. The cover plate assembly comprises a cover plate body and an anti-explosion valve, the cover plate body is provided with a sinking groove and an anti-explosion hole communicated with the sinking groove, the end face of the cover plate body is concaved inwards to form the sinking groove, the cover plate body further comprises an annular protrusion, the anti-explosion valve is arranged at the bottom of the sinking groove and can block the anti-explosion hole, and the annular protrusion surrounds the periphery of the anti-explosion valve. The depth of the sinking groove is larger than the thickness of the anti-explosion valve, and the annular protrusion and the side wall of the sinking groove are arranged in a spaced mode. The cover plate assembly can prevent the explosion-proof valve from being scratched and damaged in the collision and extrusion process of the battery, the reliability and durability of the explosion-proof valve are improved, and the damage probability of the explosion-proof valve is reduced; the annular protrusions and the side walls of the sinking grooves are arranged at intervals, the annular protrusions can prevent electrolyte from flowing into the anti-explosion holes, the safety performance of the battery is improved, the service life of the battery is prolonged, and in addition, the stress influence of the inner walls of the sinking grooves can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a cover plate assembly, a battery and an electric device. BACKGROUND

[0002] In the modern battery technology field, in order to ensure the safety of the battery in use, an explosion-proof valve is usually arranged on the cover plate of the battery. As a key component for battery safety protection, the explosion-proof valve can timely open to release the internal pressure of the battery when the pressure in the battery is abnormally increased due to overcharging, overheating or other abnormal conditions, so as to avoid serious safety accidents such as explosion of the battery, which is of great significance to ensure the safety of battery use and the life and property safety of users.

[0003] During the use, transportation or storage of the battery, falling, collision and other situations are inevitable, and the explosion-proof valve is usually arranged on the surface of the battery cover plate, which is relatively fragile and is easily damaged during collision and extrusion, resulting in a decrease in the sealing performance of the explosion-proof valve or even premature failure, so that the explosion-proof function cannot be normally played when the internal pressure of the battery is abnormal, which seriously threatens the safety of the battery. In addition, during the battery liquid injection process, due to the inclination, shaking or injection amount control deviation during the injection operation, the electrolyte is prone to leakage. Once the electrolyte leaks, it will flow into the explosion-proof hole on the cover plate matched with the explosion-proof valve, corrode the explosion-proof valve and the surrounding structure, change the opening pressure threshold of the explosion-proof valve, and reduce the safety of the battery.

[0004] Therefore, there is an urgent need for a cover plate assembly, a battery and an electric device to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a cover plate assembly, a battery and an electric device, which can improve the reliability and durability of the explosion-proof valve, reduce the damage probability, prevent the electrolyte from flowing into the explosion-proof hole, and improve the safety performance and service life of the battery.

[0006] To achieve the above purpose, the following technical solutions are provided:

[0007] A cover plate assembly comprises:

[0008] A cover plate body is provided with a sink and an explosion-proof hole communicated with the sink, the sink is formed by inwardly recessing the end face of the cover plate body, and the cover plate body further comprises an annular protrusion;

[0009] An explosion-proof valve is arranged at the bottom of the sink and can block the explosion-proof hole, the annular protrusion is arranged around the side of the explosion-proof valve, the sink depth is greater than the thickness of the explosion-proof valve, and the annular protrusion is arranged in a spaced manner between the side wall of the sink.

[0010] As an option, the cover plate assembly further comprises a pole, the cover plate body comprises:

[0011] a flat plate portion and a raised portion, the raised portion is formed by stretching at least part of the flat plate portion, the pole is arranged in the flat plate portion, a top surface of the raised portion is higher than a top surface of the pole, and the sink is arranged on the raised portion.

[0012] As an option, the raised portion comprises a top plate and a plurality of side plates surrounding the top plate, the side plates are connected to the flat plate portion, and the top plate and the side plates jointly form the accommodating groove.

[0013] As an option, a dimension of the annular raised portion in a first direction is L1, a dimension of the sink in the first direction is L2, and 3mm≤L2-L1≤6mm.

[0014] As an option, a dimension of the top plate in the first direction is L3, and 0.46≤L2 / L3≤0.8.

[0015] As an option, a cross-sectional width of the annular raised portion is W, a height of the annular raised portion is H, and 0.4mm 2 ≤W*H≤2mm 2 .

[0016] As an option, a hole depth of the explosion-proof hole is T1, and 0.5mm≤T1≤1.4mm.

[0017] As an option, the cover plate assembly further comprises:

[0018] a pole and a riveting block, the pole is arranged in the flat plate portion, and the riveting block is riveted to the pole.

[0019] As an option, the cover plate assembly further comprises:

[0020] a first insulating member arranged between the riveting block and the flat plate portion;

[0021] As an option, a second insulating member is arranged on a side of the flat plate portion away from the riveting block, and at least part of the second insulating member is arranged between the cover plate body and the pole.

[0022] A battery comprising a shell and a pole group, and further comprising the cover plate assembly.

[0023] An electric device comprising an electric device body, and further comprising the battery.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The cover plate assembly provided by this invention, by placing the explosion-proof valve at the bottom of the settling tank, and the depth of the settling tank being greater than the thickness of the explosion-proof valve, can prevent the explosion-proof valve from being scratched and damaged during battery collisions and compression, thereby improving the reliability and durability of the explosion-proof valve and reducing its probability of damage; by the annular protrusion being spaced apart from the side wall of the settling tank, the annular protrusion can prevent electrolyte from flowing into the explosion-proof hole, improving the safety performance and service life of the battery, and in addition, it can also reduce the stress effect on the inner wall of the settling tank.

[0026] The battery provided by the present invention, by applying the above-mentioned cover plate assembly, can improve the reliability and durability of the explosion-proof valve, reduce its probability of damage, and prevent electrolyte from flowing into the explosion-proof hole, thereby improving the safety performance and service life of the battery.

[0027] The electrical device provided by this invention, by using the aforementioned battery, has high safety and a long service life. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the battery structure provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a partial cross-sectional view of the battery provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a first view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a second view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0033] Figure 5 for Figure 4 Sectional view at point AA;

[0034] Figure 6 for Figure 4 Sectional view at point BB;

[0035] Figure 7 This is a structural schematic diagram of the vehicle provided in Embodiment 2 of the present invention.

[0036] Figure label:

[0037] 10000, vehicles;

[0038] 1000, battery;

[0039] 100, cover plate assembly;

[0040] 10, cover plate body; 11, flat plate portion; 111, first plate portion; 112, second plate portion; 12, protruding portion; 1201, accommodating groove; 121, top plate; 1211, explosion-proof hole; 1212, sink; 122, side plate; 13, annular protrusion;

[0041] 20, pole; 21, column portion; 22, plate portion;

[0042] 30, riveting block;

[0043] 40, first insulating member;

[0044] 50, second insulating member; 51, through hole;

[0045] 60, explosion-proof valve;

[0046] 70, sealing member; 71, first sealing portion; 72, second sealing portion;

[0047] 200, housing; 300, pole group;

[0048] 2000, controller; 3000, motor. DETAILED DESCRIPTION

[0049] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by persons skilled in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such changes and modifications be included within the scope of the present application.

[0050] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0052] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0054] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0055] Example one

[0056] As Figures 1-2As shown, the present embodiment provides a battery 1000, which comprises a shell 200 and a pole group 300, the pole group 300 is arranged in the shell 200, and the shell 200 is used to realize the supporting and protection of the pole group 300. The shell 200 can be made of plastic or metal material, wherein when the shell 200 is made of metal material, the heat dissipation performance is better, the strength is higher, and the shell 200 can support itself.

[0057] The pole group 300 in the present application can be wound or made in a laminated manner. Generally, the pole group 300 at least comprises a positive pole piece, a diaphragm and a negative pole piece.

[0058] Optionally, the shell 200 is provided with at least one opening, and the battery 1000 further comprises a cover plate assembly 100, the cover plate assembly 100 is arranged at the opening of the shell 200, the pole group 300 is connected with the cover plate assembly 100, the cover plate assembly 100 is connected with the body of the external electric device, and the battery 1000 realizes the power supply function for the body of the electric device.

[0059] As shown, Figures 2-4 The cover plate assembly 100 comprises a cover plate body 10, a pole column 20 and a riveting block 30. The pole column 20 comprises a column body part 21 and a plate body part 22, the column body part 21 is arranged in the cover plate body 10, the pole column 20 is riveted with the riveting block 30 after passing through one side of the cover plate body 10, the cover plate body 10 is clamped in the middle through the plate body part 22 and the riveting block 30, the assembly of the pole column 20 and the riveting block 30 with the cover plate body 10 is realized, the plate body part 22 of the pole column 20 is connected with the pole group 300, the pole group 300 can be connected with the outside through the pole column 20, which is convenient for the battery 1000 to charge and discharge.

[0060] Optionally, the cover plate body 10 comprises a flat plate part 11 and a protruding part 12 connected with each other, the flat plate part 11 is used to connect with the shell 200, the protruding part 12 is formed by stretching at least part of the flat plate part 11, the pole column 20 (specifically the column body part 21) is arranged in the flat plate part 11, the top surface of the protruding part 12 is higher than the top surface of the riveting block 30, the top surface of the protruding part 12 is higher than the top surface of the first insulating part 40, and the top surface of the protruding part 12 is higher than the top surface of the pole column 20. Through the above arrangement, the pole column 20, the riveting block 30 and the first insulating part 40 can be effectively protected, and the pole column 20, the riveting block 30 and the first insulating part 40 are less likely to be scratched or bumped during the process; the top surface of the pole column 20 is lower than the top surface of the protruding part 12, which provides space for the connecting piece during the grouping of the battery 1000, thereby saving the assembly space of the module, improving the grouping rate of the module, and further improving the performance of the battery 1000. In addition, the flat plate part 11 is connected with the shell 200, that is, the position where the shell 200 cooperates with the cover plate body 10 is a flat structure, the forming yield is relatively high, and the assembly of the cover plate body 10 and the shell 200 is facilitated.

[0061] Optionally, the convex portion 12 is formed by stamping the middle portion of the flat plate portion 11, which can improve the flatness precision of the stamping of the both sides of the cover plate body 10, and improve the overall strength of the cover plate body 10, and reduce the deformation of the cover plate body 10.

[0062] Optionally, the distance between the top surface of the riveting block 30 and the top surface of the convex portion 12 is greater than or equal to the thickness of the connecting sheet, that is, after the connecting sheet is welded to the pole 20, the connecting sheet does not occupy external space, thereby further saving the assembly space of the module and improving the assembly rate of the module. It can be understood that the connecting sheet is used to connect with the pole 20 to connect the positive and negative poles of the battery 1000 in series or in parallel to form the required voltage and capacity of the battery 1000 group. Optionally, the connecting sheet can be a copper connecting sheet, a nickel connecting sheet, an aluminum-nickel alloy sheet, etc.

[0063] Optionally, the flat plate portion 11 includes a first plate portion 111 and a second plate portion 112 connected with each other, the first plate portion 111 is connected with the convex portion 12, and the second plate portion 112 is arranged on the side of the first plate portion 111 away from the convex portion 12. The size of the second plate portion 112 in the first direction and the second direction is smaller than that of the first plate portion 111, and the second plate portion 112 is used to connect with the shell 200. Wherein, the first direction is the length direction of the flat plate portion 11, and the second direction is the width direction of the flat plate portion 11, that is, the length and width of the second plate portion 112 are smaller than those of the first plate portion 111, so that the second plate portion 112 can be embedded in the shell 200. After the cover plate body 10 is assembled with the shell 200, the first plate portion 111 is welded at the joint with the shell 200 to improve the connection strength of the cover plate body 10 and the shell 200.

[0064] Optionally, the convex portion 12 includes a top plate 121 and a plurality of side plates 122 surrounding the top plate 121, the side plates 122 are connected with the flat plate portion 11, and the top plate 121 and the side plates 122 jointly form a containing groove 1201, that is, the convex portion 12 is a hollow structure, which can reduce the weight of the cover plate body 10, thereby reducing the weight of the battery 1000, which is beneficial to the lightweight design of the battery 1000.

[0065] Optionally, at least part of the pole group 300 is arranged in the containing groove 1201, thereby improving the capacity of the battery 1000.

[0066] Optionally, as shown in Figure 5 The thickness of the top plate 121 is T2, and the value of T2 is 2mm, so as to ensure that the top plate 121 has sufficient strength.

[0067] Optionally, the side plate 122 comprises two oppositely arranged first side plates and two oppositely arranged second side plates, the first side plates and the second side plates are connected head to tail and the top plate 121 together form the accommodating groove 1201, the included angle between the second side plate and the top plate 121 is obtuse, and the first side plate is perpendicular to the top plate 121. The protruding part 12 of the cover plate body 10 is formed by a stamping process, by setting the included angle between the second side plate and the top plate 121 as obtuse, the protruding part 12 can be prevented from being stuck in the stamping die and from being deformed or damaged; by setting the first side plate perpendicular to the top plate 121, a larger accommodating groove 1201 can be obtained as much as possible under the premise of facilitating demolding, so that the volume of the pole group 300 accommodated in the accommodating groove 1201 is as large as possible, and the capacity of the battery 1000 is further improved.

[0068] Optionally, the cover plate assembly 100 further comprises a first insulating piece 40, which is arranged between the riveting block 30 and the cover plate body 10 to ensure insulation between the riveting block 30 and the cover plate body 10 and avoid short circuit between the riveting block 30 and the cover plate body 10.

[0069] Optionally, the cover plate assembly 100 further comprises a second insulating piece 50, which is arranged on the side of the flat plate part 11 away from the riveting block 30, can abut against the pole group 300, can fix the pole group 300 and avoid displacement of the pole group 300, and can avoid short circuit between the pole group 300 and the cover plate body 10.

[0070] In this embodiment, the second insulating piece 50 is integrally injection molded, which is beneficial to simplify the assembly process and improve the production efficiency.

[0071] In this embodiment, the pole column 20, the first insulating piece 40, the riveting block 30 and the sealing piece 70 together constitute an output assembly, the number of the output assembly is two, and the two output assemblies are arranged on the two sides of the protruding part 12 to realize current shunting and load balancing and optimize the conduction efficiency.

[0072] Optionally, the cover plate assembly 100 further comprises an explosion-proof valve 60, the top plate 121 is provided with an explosion-proof hole 1211, the second insulating piece 50 is provided with a through hole 51 in communication with the explosion-proof hole 1211, and the explosion-proof valve 60 is welded to the inner wall of the explosion-proof hole 1211. When an abnormality occurs inside the battery 1000, the gas pressure in the shell 200 reaches the explosion-proof threshold of the explosion-proof valve 60, the explosion-proof valve 60 is opened, the gas is discharged from the explosion-proof hole 1211 through the through hole 51, the internal pressure of the shell 200 is released, the thermal runaway and explosion fire of the battery 1000 are prevented, and the use safety of the battery 1000 is improved.

[0073] During the use, transportation or storage of the battery 1000, falling, collision and other situations are inevitable, and the explosion-proof valve 60 is extremely easy to be damaged during the collision and extrusion. In addition, during the liquid injection process of the battery 1000, electrolyte is prone to leakage due to the inclination, shaking or injection amount control deviation during the injection operation. Once the electrolyte leaks, the electrolyte will flow into the explosion-proof hole 1211, corrode the explosion-proof valve 60 and the surrounding structure, change the opening pressure threshold of the explosion-proof valve 60, and reduce the safety of the battery 1000.

[0074] To solve the above problems, the cover plate body 10 (specifically the top plate 121) is provided with a sink 1212 which is in communication with the explosion-proof hole 1211. The sink 1212 is formed by inwardly recessing the end face of the top plate 121. The cover plate body 10 further includes an annular protrusion 13. The explosion-proof valve 60 is arranged at the bottom of the sink 1212 and can block the explosion-proof hole 1211. The annular protrusion 13 is arranged around the side of the explosion-proof valve 60. The sink depth of the sink 1212 is greater than the thickness of the explosion-proof valve 60. The annular protrusion 13 is arranged in a spaced manner between the side wall of the sink 1212.

[0075] By arranging the explosion-proof valve 60 at the bottom of the sink 1212 and making the sink depth of the sink 1212 greater than the thickness of the explosion-proof valve 60, the explosion-proof valve 60 can be prevented from being damaged by scratching during the collision and extrusion of the battery 1000, the reliability and durability of the explosion-proof valve 60 are improved, and the damage probability is reduced. By arranging the annular protrusion 13 in a spaced manner between the side wall of the sink 1212, the annular protrusion 13 can prevent the electrolyte from flowing into the explosion-proof hole 1211, improve the safety performance and service life of the battery 1000, and further reduce the stress influence on the inner wall of the sink 1212.

[0076] Optionally, the center of the explosion-proof valve 60 coincides with the center of the top plate 121, that is, the explosion-proof valve 60 is arranged at the middle part of the top plate 121. On the one hand, this can balance the exhaust path of the battery 1000, and on the other hand, it can minimize the influence on the sizes of the two side tabs and the pole group 300 due to the arrangement of the explosion-proof valve 60.

[0077] Optionally, the dimension of the annular protrusion 13 in the first direction is L1, and the dimension of the sink 1212 in the first direction is L2, where 3mm ≤ L2 - L1 ≤ 6mm. This avoids the value of L2 - L1 being too small, resulting in a small gap between the annular protrusion 13 and the sidewall of the sink 1212, which would affect the flatness of the bottom wall of the sink 1212 during stamping, affecting the fit between the explosion-proof valve 60 and the cover plate body 10, and reducing the welding yield. Simultaneously, it avoids the value of L2 - L1 being too large, resulting in an excessively large gap between the annular protrusion 13 and the sidewall of the sink 1212, leading to insufficient overall strength of the protrusion 12 and an excessively small size of the explosion-proof valve 60, failing to meet the pressure relief requirements. For example, the value of L2 - L1 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, or 6mm. In other embodiments, the value of L2 - L1 can be any value between 3mm and 6mm or a range between any two values. The first direction refers to the length direction of the flat plate portion 11.

[0078] Optionally, the top plate 121 has a dimension of L3 in the first direction, where 0.46 ≤ L2 / L3 ≤ 0.8. This is to ensure the overall strength of the protrusion 12 and the pressure relief requirements of the explosion-proof valve 60. When the value of L2 / L3 is too small, the size of the explosion-proof valve 60 is insufficient, and the explosion-proof valve 60 cannot meet the pressure relief requirements of the battery 1000, thus reducing the safety performance of the battery 1000. When the value of L2 / L3 is too large, it reduces the overall strength of the protrusion 12, thereby affecting the overall strength of the battery 1000.

[0079] Optionally, such as Figure 6 As shown, the cross-sectional width of the annular protrusion 13 is W, meaning the dimension of the cross-section of the annular protrusion 13 along the second direction is W, and the height of the annular protrusion 13 is H, 0.4 mm. 2 ≤W*H≤2mm 2 This ensures that the annular protrusion 13 has sufficient strength. For example, the value of W*H can be 0.4 mm. 2 0.5mm 2 0.6mm 2 0.7mm 2 0.8mm 2 0.9mm 2 1mm 2 1.1mm 2 1.2mm 2 1.3mm 2 1.4mm 2 1.5mm 2 1.6mm 2 1.7mm 2 1.8mm 2 1.9mm 2 Or 2mm 2In other embodiments, the value of L2-L1 can be 0.4 mm 2 to 2 mm 2 to 2 mm. Wherein the second direction is the width direction of the flat plate portion 11.

[0080] Optionally, the cross-sectional width W of the annular protrusion 13 satisfies: 1 mm≤W≤4 mm. Wherein the value of W can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm. In other embodiments, the value of W is not limited to this, but can also be adjusted according to requirements.

[0081] Optionally, the height H of the annular protrusion 13 satisfies: 0.4 mm≤H≤0.5 mm. Wherein the value of H can be 0.4 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm or 0.5 mm. In other embodiments, the value of H is not limited to this, but can also be adjusted according to requirements.

[0082] Optionally, the projection area of the inner wall of the explosion-proof hole 1211 on the groove bottom of the sink 1212 is smaller than the projection area of the annular protrusion 13 on the groove bottom of the sink 1212, the explosion-proof valve 60 is supported on the groove bottom of the sink 1212, and the hole depth of the explosion-proof hole 1211 is T1, that is, the wall thickness of the top plate 121 supporting the part of the explosion-proof valve 60 is T1, 0.5 mm≤T1≤1.4 mm. In order to ensure that the explosion-proof valve 60 and the cover plate body 10 have good welding effect and forming effect, if the value of T1 is too small, the support thickness of the explosion-proof valve 60 is insufficient, and deformation is easy to occur during welding, the explosion-proof valve 60 is easy to deform and damage; if the value of T1 is too large, the part supporting the explosion-proof valve 60 is too thick, the stamping difficulty is increased, in addition, the weight of the cover plate body 10 is also increased, and the space of the pole group 300 is occupied.

[0083] Table 1

[0084]

[0085]

[0086] Table 1 shows the relationship between the size L1 of the annular protrusion 13 in the first direction, the size L2 of the sink 1212 in the first direction, the size L3 of the top plate 121 in the first direction, the hole depth T1 of the explosion-proof hole 1211, the thickness T2 of the top plate 121, the cross-sectional width W of the annular protrusion 13, the height H of the annular protrusion 13, L2-L1, W*H, and L2 / L3. Among them, Examples 1-6 show the values of L1, L2, L3, T1, T2, W, H, 4, L2-L1, W*H, and L2 / L3 of the battery 1000 with a qualified yield rate > 98%; Comparative Examples 1-6 show the values of T1, L2-L1, and L2 / L3 of the battery 1000 with a qualified yield rate < 98%.

[0087] Specifically, after the battery 1000 is assembled, the forming quality, appearance quality, and the like of the battery 1000 are tested to detect the qualified yield rate of the battery 1000 in the process.

[0088] The values of L1, L2, L3, T1, T2, W, H, W, L2-L1, W*H, and L2 / L3 in Examples 1-6 are all within the defined value range, and the qualified yield rate of the battery 1000 is > 98%. There is no abnormal assembly of the cover plate body 10, no abnormal strength, no damage or deformation of the explosion-proof valve 60, the pole group 300, and the tab.

[0089] In Comparative Example 1, the value of L2-L1 is too small, the distance between the annular protrusion 13 and the side wall of the sink 1212 is too small, and the flatness of the bottom wall of the sink 1212 is affected during stamping, which affects the cooperation of the explosion-proof valve 60 and the cover plate body 10 and reduces the welding yield.

[0090] In Comparative Example 2, the value of L2-L1 is too large, the distance between the annular protrusion 13 and the side wall of the sink 1212 is too large, which results in low overall strength of the protruding part 12 and small size of the explosion-proof valve 60, which cannot meet the pressure relief demand.

[0091] In Comparative Example 3, the value of L2 / L3 is too small, and the size of the explosion-proof valve 60 is insufficient, which cannot meet the demand of the battery 1000 for pressure relief and discharge, and reduces the safety performance of the battery 1000.

[0092] In Comparative Example 4, the value of L2 / L3 is too large, which reduces the overall strength of the protruding part 12 and further affects the overall strength of the battery 1000.

[0093] In Comparative Example 5, the value of T1 is too small, the part of the top plate 121 supporting the explosion-proof valve 60 is too thin, the support thickness of the explosion-proof valve 60 is insufficient, and deformation is easily generated during welding, which easily deforms and damages the explosion-proof valve 60.

[0094] In the comparative example 6, the value of T1 is too large, the portion of the top plate 121 supporting the explosion-proof valve 60 is too thick, the stamping difficulty is increased, and in addition, the weight of the cover plate body 10 is increased, and the space of the pole group 300 is occupied.

[0095] Optionally, the cover plate assembly 100 further comprises a sealing piece 70, the sealing piece 70 is clamped between the pole 20 and the cover plate body 10, the pole 20 and the cover plate body 10 can be insulated and isolated by the sealing piece 70, so as to avoid short circuit of the pole 20 and the cover plate body 10, and at the same time, the sealing piece 70 can seal the gap between the pole body 21 and the cover plate body 10, so as to avoid leakage of electrolyte or gas.

[0096] Optionally, the sealing piece 70 comprises a first sealing part 71 and a second sealing part 72, the second sealing part 72 is arranged around the outer periphery of the first sealing part 71 and located at one end of the first sealing part 71 in the axial direction, so that the cross section of the sealing piece 70 is L-shaped, the first sealing part 71 is sleeved on the outer periphery of the pole 20 and can be compressed by the cover plate body 10 and the pole body 21 of the pole 20, and the second sealing part 72 is clamped between the cover plate body 10 and the plate body 22, so as to improve the sealing effect of the sealing piece 70.

[0097] Example two

[0098] The embodiment provides a kind of electric device, which includes electric device main body and the battery 1000 provided in example one, battery 1000 can provide electric energy for electric device main body, to realize that electric device main body is automatically completed preset action by electric energy, guarantee the use performance of electric device main body, guarantee the service life and safety performance of electric device.

[0099] Specifically, the electric device main body can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy or an electric tool, etc.The vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car or a hybrid electric car, etc.The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc.The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator or an electric planer, etc.The embodiment does not limit the above-mentioned electric device main body.

[0100] The following examples are for convenience of illustration, such as Figure 7As shown, a vehicle 10000 is taken as an example of a power utilization device body according to an embodiment of the present application. The vehicle 10000 is internally provided with a battery 1000, which can be arranged at the bottom, head or tail of the vehicle 10000. The number of the battery 1000 can be one or more, and the multiple batteries 1000 can be connected in series, parallel or mixed connection. The mixed connection means that there are both series and parallel connections among the multiple batteries 1000.

[0101] The battery 1000 can be used for power supply of the vehicle 10000, for example, the battery 1000 can be used as an operating power supply of the vehicle 10000. The vehicle 10000 can further include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery 1000 to supply power to the motor 3000, for example, to meet the power demand of the vehicle 10000 during starting, navigation and driving.

[0102] In some embodiments of the present application, the battery 1000 can not only be used as an operating power supply of the vehicle 10000, but also be used as a driving power supply of the vehicle 10000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 10000.

[0103] It is noted that in the description of the present application, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in conjunction with these embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0104] The above is only the preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body (10) is provided with a recess (1212) and an explosion-proof hole (1211) connected to the recess (1212). The recess (1212) is formed by the inward recess of the end face of the cover plate body (10). The cover plate body (10) also includes an annular protrusion (13). An explosion-proof valve (60) is disposed at the bottom of the settling tank (1212) and is capable of blocking the explosion-proof hole (1211). The annular protrusion (13) surrounds the periphery of the explosion-proof valve (60). The depth of the settling tank (1212) is greater than the thickness of the explosion-proof valve (60). The annular protrusion (13) is spaced apart from the side wall of the settling tank (1212).

2. The cover plate assembly according to claim 1, characterized in that, The cover plate assembly further includes a pole post (20), and the cover plate body (10) includes: The plate portion (11) and the protrusion portion (12) are formed by stretching at least a portion of the plate portion (11), the pole post (20) is inserted through the plate portion (11), the top surface of the protrusion portion (12) is higher than the top surface of the pole post (20), and the groove (1212) is provided on the protrusion portion (12).

3. The cover plate assembly according to claim 2, characterized in that, The protrusion (12) includes a top plate (121) and a plurality of side plates (122) surrounding the top plate (121). The side plates (122) are connected to the flat plate (11), and the top plate (121) and the side plates (122) together form a receiving groove (1201).

4. The cover plate assembly according to claim 3, characterized in that, The annular protrusion (13) has a dimension of L1 in the first direction, and the sink groove (1212) has a dimension of L2 in the first direction, 3mm≤L2-L1≤6mm; And / or, the dimension of the top plate (121) in the first direction is L3, 0.46≤L2 / L3≤0.

8.

5. The cover plate assembly according to claim 1, characterized in that, The cross-sectional width of the annular protrusion (13) is W, and the height of the annular protrusion (13) is H, 0.4 mm. 2 ≤W*H≤2mm 2 .

6. The cover plate assembly according to claim 1, characterized in that, The depth of the explosion-proof hole (1211) is T1, where 0.5mm≤T1≤1.4mm.

7. The cover plate assembly according to claim 2, characterized in that, The cover plate assembly also includes: The pole (20) and the riveting block (30) are provided, wherein the pole (20) is inserted through the flat plate (11) and the riveting block (30) is riveted to the pole (20).

8. The cover plate assembly according to claim 7, characterized in that, The cover plate assembly also includes: A first insulating member (40) is disposed between the riveting block (30) and the flat plate portion (11); And / or, a second insulating member (50) is disposed on the side of the flat plate portion (11) away from the riveting block (30), and at least a portion of the second insulating member (50) is disposed between the cover plate body (10) and the pole post (20).

9. A battery comprising a casing (200) and an electrode assembly (300), characterized in that, It also includes the cover plate assembly as described in any one of claims 1-8.

10. An electrical appliance, comprising an electrical appliance body, characterized in that, It also includes the battery as described in claim 9.

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