A battery and a cover plate assembly thereof

Abstract

The application relates to the technical field of batteries and discloses a cover plate assembly of a battery, which comprises a cover plate, a pole, a pressing plate arranged on one side of the cover plate, the pressing plate being welded on the pole and forming a welding part, and an insulating piece, at least a part of which is arranged between the pressing plate and the cover plate, the distance between the insulating piece and the surface of the pressing plate away from the insulating piece being d1 mm, and the following condition being met: 1.5 <= d1 <= 3; wherein the width of the welding part is w mm, the depth of the welding part is h mm, the thermal deformation temperature of the insulating piece is T DEG C, and the thickness of the flat plate part is t mm, and the following condition is met: 0.0008 <= w*h / (T*t) <= 0.045, wherein the width of the welding part is the distance between the edge of the welding part on the pressing plate and the other edge on the pole. Through the characteristics of the insulating piece and the adjustment of the specific size of the welding part, the problem of softening of the insulating piece during welding of the pressing plate and the pole can be avoided, and the phenomenon of insulation failure of the insulating piece can be prevented.

Description

TECHNICAL FIELD

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

[0002] At present, the pole of the battery is penetrated by a cover plate, and a pressing plate is further arranged, the pressing plate is welded with the pole, and in order to avoid short circuit between the pressing plate and the cover plate, an insulating piece is further arranged between the pressing plate and the cover plate.

[0003] When the pressing plate and the pole are welded, heat is generated, the heat is transferred to the insulating piece, the insulating piece is softened, and the insulating piece has the problem of insulation failure. SUMMARY

[0004] The purpose of the present application is to provide a battery and a cover plate assembly thereof, which can avoid the problem of softening of the insulating piece when the pressing plate and the pole are welded, so as to prevent the phenomenon of insulation failure of the insulating piece.

[0005] In order to achieve the above-mentioned purpose, the present application provides a cover plate assembly of a battery, comprising:

[0006] a cover plate provided with a mounting hole, the mounting hole penetrating the cover plate along the thickness direction of the cover plate;

[0007] a pole penetrating the mounting hole;

[0008] a pressing plate arranged on one side of the plate surface of the cover plate, the pressing plate being arranged around the outer peripheral side of the pole, and the pressing plate being welded with the outer peripheral side of the pole to form a welding portion;

[0009] an insulating piece comprising a flat plate portion arranged between the pressing plate and the cover plate, the thickness of the pressing plate being d1 mm, and satisfying: 1.5≤d1≤3;

[0010] wherein the width of the welding portion is w mm, the depth of the welding portion is h mm, the heat distortion temperature of the insulating piece is T℃, the thickness of the flat plate portion is t mm, and satisfying: 0.0008≤w*h / (T*t)≤0.045.

[0011] The present application further provides a battery comprising the above-mentioned battery.

[0012] The present application provides a battery and a cover plate assembly thereof, which has the beneficial effects compared with the prior art, that is:

[0013] The battery of the present application comprises a cover plate assembly, which comprises a cover plate, a pole, a pressing plate and an insulating piece. The pole is arranged through a mounting hole on the cover plate. The pressing plate is arranged around the pole and is welded with the pole to form a welding part. The insulating piece is arranged at least partially between the pressing plate and the cover plate. By limiting the size of the welding part, the heat deformation temperature and the size of the insulating piece, the specific size of the welding part can be adjusted in combination with the characteristics of the insulating piece. The connection strength between the pressing plate and the pole can be ensured, and the problem of softening of the insulating piece during welding of the pressing plate and the pole can be avoided, and the phenomenon of insulation failure of the insulating piece can be prevented.

[0014] The battery of the present application comprises the cover plate assembly described above. The connection strength between the pressing plate and the pole can be ensured, and the problem of softening of the insulating piece during welding of the pressing plate and the pole can be avoided, and the phenomenon of insulation failure of the insulating piece can be prevented, and the quality of the battery can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the cover plate assembly of the embodiment of the present application.

[0016] Figure 2 is Figure 1 is a disassembled view of the cover plate assembly in FIG.

[0017] Figure 3 is Figure 1 is a sectional view in the direction of A-A.

[0018] Figure 4 is Figure 3 is an enlarged schematic view of B in FIG.

[0019] Figure 5 is Figure 4 is an enlarged schematic view of C in FIG.

[0020] In the drawings, 1 is a cover plate; 2 is a pole; 3 is a pressing plate; 4 is an insulating piece; 5 is a sealing piece; 11 is a mounting hole; 21 is a protruding part; 31 is a welding part; 41 is a flat plate part; 42 is a first vertical part; and 43 is a second vertical part. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0022] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements 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. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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 communication inside two elements. 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.

[0024] In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] 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.

[0026] Please refer to Figure 1 and Figure 2 The cover plate 1 assembly of the battery according to the preferred embodiment of the present application comprises: a cover plate 1, a pole 2, a pressing plate 3 and an insulating piece 4.

[0027] The cover plate 1 is provided with a mounting hole 11, which penetrates the cover plate 1 along the thickness direction of the cover plate 1.

[0028] The cover plate 1 is the cover plate 1 of the battery, and the battery further comprises a shell, an electric core is arranged in the shell, and the cover plate 1 is arranged on the shell.

[0029] The pole 2 is arranged through the mounting hole 11.

[0030] The pole 2 is used for electrically connecting the electric core with external equipment, and the pole 2 is divided into positive poles 2 and negative poles 2 with different polarities. The positive pole 2 or the negative pole 2 of each battery can be provided as a plurality. In the present embodiment, one positive pole 2 and one negative pole 2 are provided. In the specific production implementation, the number and position of the poles 2 can be set according to the needs.

[0031] The pressing plate 3 is arranged on one side of the plate surface of the cover plate 1, and is arranged around the outer circumferential side of the pole 2 and is welded to the outer circumferential side of the pole 2 to form a welding portion 31.

[0032] The pole 2 passes through the cover plate 1, and the pressing plate 3 needs to provide support force to the pole 2.

[0033] The welding portion 31 is a portion formed after the pole 2 and the pressing plate 3 are welded and the molten pool is cooled. The welding portion 31 has a portion on the pressing plate 3 and a portion on the pole 2.

[0034] Please refer to Figures 3-5 The distance between the pressing plate 3 and the surface of the insulation member 4 away from the insulation member 4 is d1 mm, that is, the thickness of the pressing plate 3 is d1 mm, and satisfies 1.5≤d1≤3. Preferably, d1 can also take values such as 1.7, 1.9, 2, 2.3, 2.5, 2.8, etc.

[0035] The insulation member 4 is a component for preventing short circuit between the pressing plate 3 and the cover plate 1. In the embodiment, the insulation member 4 is annular. The projection of the flat plate portion 41 on the cover plate 1 at least partially coincides with the projection of the pressing plate 3 on the cover plate 1. In the embodiment, the projection of the pressing plate 3 on the cover plate 1 completely falls within the projection profile of the flat plate portion 41 on the cover plate 1.

[0036] If d1 is too small, the distance between the insulation member 4 and the welding heat source is too small, and the insulation member 4 is easily heated to cause insulation failure. If d1 is too large, the pressing plate 3 will interfere with the connection of the pole 2 and the bus bar outside the battery, so that the battery cannot supply power to the outside through the pole 2.

[0037] The distance between the edge of the welding portion 31 on the pressing plate 3 and the other edge on the pole 2 is w mm, that is, the width of the welding portion 31 is w mm, and the width of the welding portion 31 is the width of the surface weld after the pressing plate 3 and the pole 2 are welded. The depth of the welding portion 31 is h mm, and the depth of the welding portion 31 refers to the dimension of the welding portion 31 in the thickness direction of the cover plate 1, and any width direction of the welding portion 31 is perpendicular to the depth direction of the welding portion 31. The heat distortion temperature of the insulation member 4 is T ℃, the thickness of the flat plate portion 41 is t mm, and satisfies 0.0008≤w*h / (T*t)≤0.045. Preferably, w*h / (T*t) can take values such as 0.001, 0.005, 0.01, 0.015, 0.02, 0.026, 0.031, 0.035, 0.04, etc.

[0038] The pressing plate 3 and the pole 2 generate heat during welding. If the heat is too high, the insulation 4 between the pressing plate 3 and the cover plate 1 will soften, resulting in insulation failure. Therefore, by limiting the size of the welding portion 31, the heat distortion temperature and the size of the insulation 4, the specific size of the welding portion 31 can be adjusted in combination with the characteristics of the insulation 4, so as to prevent the insulation 4 from failing.

[0039] When the range is met, the connection strength between the pressing plate 3 and the pole 2 can be ensured, and the problem of softening of the insulation 4 during welding of the pressing plate 3 and the pole 2 can be avoided, preventing the insulation 4 from failing. In the case of a larger T, or a larger t, the insulation 4 is not prone to softening, and the welding portion 31 w and h can be appropriately increased. If the w or h of the welding portion 31 is too small, the connection strength between the pressing plate 3 and the pole 2 will be affected, and the structure between the cover plate 1 and the pole 2 will be easily damaged and the sealing will fail.

[0040] When measuring w, h, d1 and t, a general length measuring tool can be used, such as a vernier caliper.

[0041] Specifically, for w, the distance between the edge on the pressing plate 3 and the other edge on the pole 2 is measured, and the average value is obtained by measuring multiple times, and the width w of the welding portion is mm.

[0042] For h, the welding portion 31 can be cut open, and the distance between the surface of the welding portion 31 on the cross section and the deepest part of the welding portion 31 is measured, and the average value is obtained by measuring multiple times, and the depth h of the welding portion 31 is mm.

[0043] For t, the insulation 4 is taken, the distance between the two surfaces of the part of the insulation 4 between the pressing plate 3 and the cover plate 1 is measured, and the average value is obtained by measuring multiple times, and the thickness t of the flat plate portion 41 is mm.

[0044] For d1, the distance between the surface of the insulation 4 facing the pressing plate 3 and the surface of the pressing plate 3 away from the insulation 4 is measured, and the average value is obtained by measuring multiple times, and the thickness d1 of the pressing plate 3 is mm.

[0045] T is tested according to the national standard "GB 1035-70 Plastic Heat Resistance (Martin) Test Method".

[0046] To support the rationality of the above numerical range, the cover plate assembly meeting the above numerical range is also subjected to strength test and short circuit test, and the pulling force value and breakdown voltage are taken as index data, and 8 groups are set in this embodiment. At the same time, the test data of the cover plate assembly not meeting the above numerical range is provided as a comparison, and 2 groups are set in this embodiment.

[0047] For the connection strength between the pressure plate 3 and the terminal 2, it is reflected by detecting the tensile value through a tensile test. Specifically, for each group of tests, 10 batteries are taken. A tensile block is assembled on the surface of the terminal 2. One end of the tensile testing machine fixes the pressure ring, and the other end pulls the terminal through the tensile block. Turn on the sensor of the tensile testing machine until the terminal 2 falls off, and read the maximum value in the tensile value curve as the tensile value. The average tensile value greater than 1200N is qualified.

[0048] For the insulation performance of the insulating part 4, it is reflected by the breakdown voltage. Specifically, for each group of tests, 10 batteries are taken. Different voltage values are set between the terminal 2 and the pressure plate 3 through a voltage source to apply voltage, and observe whether there are breakdown spark marks, and the resistance value between the terminal 2 and the pressure plate 3 after applying voltage, whether it becomes zero. The average breakdown voltage less than 1200V is unqualified.

[0049] Please refer to Table 1 for the test parameters and index data of each group.

[0050] Table 1

[0051]

[0052] As can be seen from the data in Table 1, the cover plate assembly that meets the above numerical range has high strength and insulation performance

[0053] In some embodiments, the width w mm of the welding part 31, the depth h mm of the welding part 31, the heat distortion temperature T °C of the insulating part 4, and the thickness t mm of the flat part 41 also satisfy: 0.0009 ≤ w*h / (T*t) ≤ 0.04. Preferably, w*h / (T*t) can take values such as 0.001, 0.0012, 0.0018, 0.002, 0.0024, 0.0027, 0.003, 0.0033, 0.0035, 0.0038.

[0054] Taking Figure 4 the shown orientation, at least a part of the welding part 31 is on the pressure plate , and the insulating part 4 usually corresponds to the size of the pressure plate 3. Therefore, at least a part of the welding part 31 is above the insulating part 4. The welding part 31 is relatively close to the insulating part 4, and heat is more easily transferred to the insulating part 4. Therefore, when satisfying the range of [0.0009 ≤ w*h / (T*t) ≤ 0.04], it ensures the connection strength between the pressure plate 3 and the terminal 2 and at the same time prevents the insulating part 4 from softening.

[0055] The depth h mm of the welding part 31 satisfies: 0.5 ≤ h ≤ 2. Preferably, h can take values such as 0.7, 1, 1.2, 1.5, 1.7, 1.9.

[0056] If h is too large, the welding power is too large, which can result in a larger molten pool, a larger heat-affected zone, and a larger probability of mechanical fatigue of the weld, and if h is too small, the welding strength between the pressing plate 3 and the pole 2 is not high.

[0057] The thermal deformation temperature T of the insulation piece 4 satisfies 150≤T≤350. Preferably, T can take values of 160, 172, 185, 190, 198, 210, 225, 238, 249, 263, 275, 289, 291, 305, 314, 326, 338, 342, etc.

[0058] If T is too small, the insulation piece 4 is prone to softening, affecting the insulation performance. If T is too large, the material strength of the insulation piece 4 is reduced, resulting in poor resistance to fracture, and the insulation piece 4 is prone to fracture after being pressed.

[0059] The thickness t of the flat plate part 41 satisfies 0.5≤t≤1. Preferably, t can take values of 0.6, 0.7, 0.8, 0.9, etc.

[0060] If t is too large, the insulation piece 4 is too thick, which can result in a larger axial dimension of the pole 2, and the overall space occupied by the battery or even the battery pack. If t is too small, the insulation piece 4 is too thin, and the insulation piece 4 is more susceptible to softening due to the welding heat of the pressing plate 3 and the pole 2.

[0061] The width w of the welding part 31 satisfies 0.5≤w≤2. Preferably, w can take values of 0.7, 0.9, 1, 1.3, 1.5, 1.8, etc.

[0062] If w is too large, the welding power is too large, which can result in a larger molten pool, a larger heat-affected zone, and a larger probability of mechanical fatigue of the weld, and if w is too small, the welding strength between the pressing plate 3 and the pole 2 is not high.

[0063] The pressing plate 3 is annular, and the distance between the outer edge and the inner edge of the pressing plate 3 in the plane where the central axis of the pole 2 is located is w2 mm, that is, the ring width of the pressing plate 3 is w2 mm. The pole 2 has a protruding part 21 located at one end of the pole 2, and the protruding part 21 is on the same side of the pressing plate 3 as the cover plate 1. The size of the protruding part 21 in the direction perpendicular to the thickness direction of the cover plate 1 is D mm, that is, the width of the protruding part 21 is D mm, and satisfies 0.05≤w2 / D≤0.4. Preferably, w2 / D can take values of 0.1, 0.15, 0.18, 0.2, 0.23, 0.27, 0.3, 0.35, etc.

[0064] In the embodiment, the pole column 2 is substantially cylindrical, and the size of the position where the protruding part 21 is located is reduced compared with the overall size of the pole column 2, and forms the shape of a shaft shoulder, the part where the protruding part 21 is located is also cylindrical, and D is the diameter of this part.

[0065] When this range is met, the support force of the pressing plate 3 to the pole column 2 can be ensured, and the size of the pole column 2 is sufficient, and the overcurrent of the battery is not affected. If w2 / D is too small, the support force of the pressing plate 3 to the pole column 2 is not enough, and if w2 / D is too large, the size of the pressing plate 3 is too large, and the space of the pole column 2 is occupied, which leads to the reduction of the size of the pole column 2 and affects the overcurrent of the battery.

[0066] In addition, w2 also satisfies: 2≤w2≤4, preferably, w2 can take values such as 2.3, 2.5, 2.9, 3, 2.2, 2.5, 2.8, 3.2, 3.6, 3.9, etc.

[0067] D also satisfies: 10≤D≤40, preferably, D can take values such as 13, 16, 19, 25, 29, 34, 38, etc.

[0068] When measuring D and w2, common length measuring tools can be used, such as vernier calipers and the like.

[0069] Specifically, for D, the maximum width of the protruding part 21 is measured in the thickness direction perpendicular to the cover plate 1, and the average value is obtained by measuring multiple times, and the width of the protruding part 21 is D mm.

[0070] For w2, the distance between the outer edge and the inner edge of the pressing plate 3 in the plane where the central axis of the pole column 2 is located is measured, and the average value is obtained by measuring multiple times, and the ring width w2 of the pressing plate 3 is mm.

[0071] The insulating part 4 also includes a first vertical part 42, the flat plate part 41 is arranged between the pressing plate 3 and the cover plate 1, one end of the first vertical part 42 is connected with the flat plate part 41, and the other end of the first vertical part 42 away from the flat plate part 41 is located on both sides of the flat plate part 41 respectively, the first vertical part 42 is located in the mounting hole 11, the surface of the first vertical part 42 towards the pole column 2 is at least partially attached to the pole column 2, and the size of the first vertical part 42 in the thickness direction of the cover plate 1 is d2 mm, which satisfies: 0.3≤d2≤1. Preferably, d2 can also take values such as 0.5, 0.7, 0.9, etc.

[0072] In the embodiment, the first vertical part 42 is arranged at one end of the flat plate part 41 towards the pole column 2, the first vertical part 42 is arranged around the outside of the pole column 2, and is arranged in the mounting hole 11 and extends towards the direction where the battery cell is located, and the first vertical part 42 can separate the cover plate 1 and the pole column 2, and has a certain sealing effect.

[0073] When d2 meets this range, the size of the first vertical portion 42 is ensured to avoid the failure of the shrinkage sealing caused by heat, but if d2 is too large, the second vertical portion 43 is prone to interfere with the mounting hole 11, the sealing member 5 and the lower flange of the pole 2 during assembly, which limits the height of the pole 2; if d2 is too small, the sealing effect is affected by the shrinkage caused by heat.

[0074] The cover plate 1 assembly of the battery further comprises a sealing member 5, which is arranged between the cover plate 1 and the pole 2 and is located on the side of the insulating member 4 away from the pressing plate 3. The projection of the sealing member 5 on the cover plate 1 coincides with the projection of the insulating member 4 on the cover plate 1.

[0075] When measuring d2, a common length measuring tool can be used, such as a vernier caliper.

[0076] Specifically, the distance between the two ends of the first vertical portion 42 in the thickness direction of the cover plate 1 is tested, and the average value is obtained by measuring multiple times to obtain the size d2 mm of the first vertical portion 42 in the thickness direction of the cover plate 1.

[0077] The sealing member 5 is at least partially arranged on the plate surface of the cover plate 1 in the direction towards the battery cell, and the sealing member 5 surrounds the outside of the pole 2, so that the gap between the pole 2 and the inner wall of the mounting hole 11 is sealed.

[0078] In the formula, the thermal deformation temperature T of the insulating member 4 and the thickness t of the flat plate portion 41 satisfy 75≤T*t≤350. Preferably, T*t can also take values of 80, 86, 94, 100, 112, 129, 145, 165, 179, 191, 216, 237, 254, 269, 276, 294, 310, 325, 338, 342, etc.

[0079] When this range is met, the insulating member 4 plays a role in blocking the transmission of welding heat from the pressing plate 3 and the pole 2 to the sealing member 5, thereby avoiding sealing failure.

[0080] In this embodiment, the sealing member 5 is a sealing ring.

[0081] The insulating member 4 further comprises a second vertical portion 43, one end of the second vertical portion 43 is connected to the flat plate portion 41, and the second vertical portion 43 is wrapped around the outer circumferential surface of the pressing plate 3. In the thickness direction perpendicular to the cover plate 1, the minimum distance d between the second vertical portion 43 and the welding portion 31 satisfies 0.5≤d≤3.5. Preferably, d can also take values of 0.8, 1.2, 1.5, 1.8, 2.3, 2.6, 2.9, 3.2, 3.4, etc.

[0082] The second vertical part 43 can avoid the risk of short circuit between the side of the pressing plate 3 and the cover plate 1 due to the wire lap. In the embodiment, the second vertical part 43 is arranged at the end of the flat plate part 41 away from the pole 2.

[0083] When d is too small, the smaller the distance between the second vertical part 43 and the welding part 31, the greater the probability of damage to the second vertical part 43 due to the welding heat; when d is too large, the greater the distance between the second vertical part 43 and the welding part 31, which means that the distance w2 between the outer edge and the inner edge of the pressing plate 3 in the plane where the central axis of the pole 2 is located is too large, which is not conducive to the overcurrent of the pole 2.

[0084] When measuring d, a common length measuring tool can be used, such as a vernier caliper.

[0085] Specifically, for d, the distance between the surface of the second vertical part 43 on the side facing the pole 2 and the edge of the welding part 31 on the pressing plate 3 is measured multiple times and averaged, and the distance between the second vertical part 43 and the welding part 31 in the plane where the central axis of the pole 2 is located is d mm.

[0086] The embodiment also provides a battery comprising the cover plate 1 assembly described above, which can ensure the connection strength between the pressing plate 3 and the pole 2, avoid the problem of softening of the insulating part 4 when the pressing plate 3 and the pole 2 are welded, prevent the phenomenon of insulation failure of the insulating part 4, and ensure the quality of the battery.

[0087] The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled persons in the technical field, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A cover plate assembly for a battery, characterized by The battery cover plate assembly comprises: a cover plate provided with a mounting hole penetrating through the cover plate along the thickness direction of the cover plate; a pole column penetrating through the mounting hole; a pressing plate provided on one side of the plate surface of the cover plate, the pressing plate being provided around the outer circumferential side of the pole column and being welded with the outer circumferential side of the pole column to form a welding portion; an insulating piece comprising a flat plate portion provided between the pressing plate and the cover plate, the thickness of the pressing plate being d1 mm, and satisfying 1.5≤d1≤3; wherein the width of the welding portion is w mm, the depth of the welding portion is h mm, the heat distortion temperature of the insulating piece is T ℃, and the thickness of the flat plate portion is t mm, and satisfying 0.0008≤w*h / (T*t)≤0.

045. 150≤T≤350； 0.5≤t≤1。 2. The battery cover plate assembly according to claim 1, wherein the projection of the welding portion on the cover plate at least partially coincides with the projection of the insulating piece on the cover plate; the width w mm of the welding portion, the depth h mm of the welding portion, the heat distortion temperature T ℃ of the insulating piece, and the thickness t mm of the flat plate portion further satisfy 0.0009≤w*h / (T*t)≤0.

04.

3. The battery cover plate assembly according to claim 1, wherein the depth h mm of the welding portion satisfies 0.5≤h≤2.

4. The battery cover plate assembly according to claim 1, wherein the width w mm of the welding portion satisfies 0.5≤w≤2.

5. The battery cover plate assembly according to claim 1, wherein the pressing plate is annular, the annular width of the pressing plate is w2 mm, the pole column has a protruding portion at one end of the pole column, the protruding portion is on the same side of the cover plate as the pressing plate, the width of the protruding portion is D mm, and satisfying 0.05≤w2 / D≤0.4, wherein the width of the protruding portion is the dimension of the protruding portion in the thickness direction perpendicular to the cover plate.

6. The battery cover plate assembly according to claim 1, wherein the insulating piece further comprises a first vertical portion, the first vertical portion is also located in the mounting hole, one end of the first vertical portion is connected with the flat plate portion, the other end of the first vertical portion away from the flat plate portion is located on the two sides of the flat plate portion respectively, the surface of the first vertical portion facing the pole column is at least partially attached to the pole column, and the dimension of the first vertical portion in the thickness direction of the cover plate is d2 mm, satisfying 0.3≤d2≤1.

7. The cover plate assembly of the battery according to claim 1, wherein Further comprising: a sealing piece provided between the cover plate and the pole column, and located on the side of the insulating piece away from the pressing plate, the projection of the sealing piece on the cover plate coincides with the projection of the insulating piece on the cover plate; wherein the heat distortion temperature T ℃ of the insulating piece and the thickness t mm of the flat plate portion further satisfy 75≤T*t≤350.

8. The battery cover plate assembly according to claim 1, wherein The insulating member further includes a second vertical portion having one end connected to the flat plate portion, the second vertical portion being wrapped around an outer peripheral surface of the press plate, and a minimum distance between the second vertical portion and the welding portion in a thickness direction perpendicular to the cover plate is d mm, satisfying 0.5 ≤ d ≤ 3.

5.

9. A battery, characterized by A cover plate assembly comprising the cover plate assembly according to any one of claims 1 to 8.

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