Battery and cover plate assembly thereof

Abstract

The invention relates to the technical field of batteries, and discloses a cover plate assembly of a battery, the cover plate assembly comprises a cover plate, a pole and a pressing plate arranged on one side of the cover plate, the pressing plate is welded on the pole and forms a welding part; at least one part of the insulating part is arranged between the pressing plate and the cover plate, the distance between the insulating part and the surface, deviating from the insulating part, of the pressing plate is d1mm, and d1 is larger than or equal to 1.5 and smaller than or equal to 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 part is T DEG C, the thickness of the flat plate part is t mm, and w * h / (T * t) is larger than or equal to 0.0008 and smaller than or equal to 0.045, and the width of the welding part is the distance between the edge, located on the pressing plate, of the welding part and the other edge, located on the pole, of the welding part. According to the invention, the specific size of the welding part is adjusted through the characteristics of the insulating part, so that the problem of softening of the insulating part during welding of the pressing plate and the pole can be avoided, and the phenomenon of insulation failure of the insulating part is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and a cover plate assembly thereof. Background Art

[0002] At present, the pole of the battery is penetrated by a cover plate, and a pressure plate is also provided. The pressure plate is welded to the pole. In order to avoid a short circuit between the pressure plate and the cover plate, an insulating member is also provided between the two.

[0003] When the pressure plate and the pole are welded, heat is generated, and the heat is transferred to the insulating part, causing the insulating part to soften, thereby causing the insulating part to have insulation failure problems. Summary of the invention

[0004] The purpose of the present invention is to provide a battery and a cover plate assembly thereof, which can avoid the problem of softening of insulating parts when welding a pressing plate and a pole, so as to prevent the insulating parts from insulation failure.

[0005] In order to achieve the above object, the present invention provides a battery cover assembly, comprising: A cover plate, which is provided with a mounting hole, wherein the mounting hole penetrates the cover plate along the thickness direction of the cover plate; A pole, which is inserted into the mounting hole; A pressing plate, which is arranged on one side of the plate surface of the cover plate, the pressing plate is arranged around the outer peripheral side of the pole, and the pressing plate is welded to the outer peripheral side of the pole to form a welding portion; An insulating member, comprising a flat plate portion disposed between the pressing plate and the cover plate, wherein the pressing plate has a thickness of d1 mm and satisfies: 1.5≤d1≤3; The width of the welding portion is w mm, the depth of the welding portion is h mm, the thermal deformation temperature of the insulating member is T°C, the thickness of the flat plate portion is t mm, and the following condition is satisfied: 0.0008≤w*h / (T*t)≤0.045.

[0006] The present invention also provides a battery, comprising the above-mentioned battery.

[0007] The present invention provides a battery and a cover plate assembly thereof, which have the following beneficial effects compared with the prior art: The pressure plate assembly of the battery of the present invention comprises a cover plate, a pole, a pressure plate and an insulating member, the pole is passed through a mounting hole on the cover plate, the pressure plate is arranged around the pole and is welded with the pole to form a welding portion, at least a part of the insulating member is arranged between the pressure plate and the cover plate, and by limiting the size of the welding portion, the thermal deformation temperature of the insulating member and the numerical relationship of the size, the specific size of the welding portion can be adjusted in combination with the characteristics of the insulating member, which can ensure the connection strength between the pressure plate and the pole, and avoid the problem of softening of the insulating member when the pressure plate and the pole are welded, thereby preventing the insulating member from failing in insulation.

[0008] The battery of the present invention includes the above-mentioned cover plate assembly, which can not only ensure the connection strength between the pressure plate and the pole, but also avoid the problem of softening of the insulating parts when the pressure plate and the pole are welded, prevent the insulation failure of the insulating parts, and ensure the quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the structure of the cover plate assembly according to an embodiment of the present invention.

[0010] Figure 2 yes Figure 1 Disassembly diagram of the middle cover assembly.

[0011] Figure 3 yes Figure 1 Section view in AA direction.

[0012] Figure 4 yes Figure 3 A magnified schematic diagram of point B in the middle.

[0013] Figure 5 yes Figure 4 Enlarged schematic diagram of point C in the middle.

[0014] In the figure, 1, cover plate; 2, pole; 3, pressure plate; 4, insulating member; 5, sealing member; 11, mounting hole; 21, protruding portion; 31, welding portion; 41, flat plate portion; 42, first vertical portion; 43, second vertical portion. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0019] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Please refer to Figure 1 and Figure 2 A battery cover plate 1 assembly according to a preferred embodiment of the present invention comprises: a cover plate 1, a pole 2, a pressing plate 3 and an insulating member 4.

[0021] The cover plate 1 is provided with a mounting hole 11 , and the mounting hole 11 penetrates the cover plate 1 along the thickness direction of the cover plate 1 .

[0022] The cover plate 1 is a cover plate 1 of a battery. The battery further comprises an outer shell, in which a battery cell is arranged, and the cover plate 1 is covered on the outer shell.

[0023] The pole 2 is inserted into the mounting hole 11 .

[0024] The electrode column 2 is used to electrically connect the battery cell to external equipment. The electrode column 2 is divided into a positive electrode column 2 and a negative electrode column 2 with different polarities. Each battery can have multiple positive electrode columns 2 or negative electrode columns 2. In this embodiment, one positive electrode column 2 and one negative electrode column 2 are provided. In specific production implementation, the number and position of the electrode column 2 can be set as needed.

[0025] The pressing plate 3 is disposed on one side of the plate surface of the cover plate 1 , and is disposed around the outer circumference of the pole 2 . The pressing plate 3 and the outer circumference of the pole 2 are welded to form a welding portion 31 .

[0026] After the pole 2 passes through the cover plate 1 , the pressing plate 3 is required to provide support force for the pole 2 .

[0027] The welding part 31 is formed after the pole 2 and the pressing plate 3 are welded and the molten pool is cooled. A part of the welding part 31 is on the pressing plate 3, and a part of the welding part 31 is on the pole 2.

[0028] Please refer to Figure 3-Figure 5 The insulating member 4 includes a flat plate portion 41 disposed between the pressing plate 3 and the cover plate 1, and the distance between the insulating member 4 and the surface of the pressing plate 3 facing away from the insulating member 4 is d1 mm, that is, the thickness of the pressing plate 3 is d1 mm, satisfying: 1.5≤d1≤3. Preferably, d1 can also be 1.7, 1.9, 2, 2.3, 2.5, 2.8, etc.

[0029] The insulating member 4 is a component used to prevent a short circuit between the pressing plate 3 and the cover plate 1. In this embodiment, the insulating member 4 is annular. The projection of the flat plate portion 41 on the cover plate 1 at least partially overlaps with the projection of the pressing plate 3 on the cover plate 1. In this embodiment, the projection of the pressing plate 3 on the cover plate 1 completely falls within the projection contour of the flat plate portion 41 on the cover plate 1.

[0030] If d1 is too small, the distance between the insulating member 4 and the welding heat source is too small, and the insulating member 4 is easily heated and fails to be insulated. If d1 is too large, the pressing plate 3 will interfere with the connection between the pole 2 and the busbar outside the battery, making it impossible for the battery to supply power to the outside through the pole 2.

[0031] Among them, the distance between the edge of the welding part 31 located on the pressure plate 3 and the other edge located on the pole 2 is w mm, that is, the width of the welding part 31 is w mm, and the width of the welding part 31 is the width of the surface weld after the pressure plate 3 and the pole 2 are welded. The depth of the welding part 31 is h mm, and the depth of the welding part 31 refers to the dimension of the welding part 31 in the thickness direction of the cover plate 1. Any width direction of the welding part 31 is perpendicular to the depth direction of the welding part 31. The thermal deformation temperature of the insulating part 4 is T℃, and the thickness of the flat plate part 41 is t mm, which 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, and 0.04.

[0032] Heat is generated during the welding process of the pressure plate 3 and the pole 2. If overheated, the insulating member 4 between the pressure plate 3 and the cover plate 1 will soften, resulting in insulation failure. Therefore, by limiting the size of the welding portion 31, the thermal deformation temperature of the insulating member 4, and the numerical relationship of the size, the specific size of the welding portion 31 can be adjusted in combination with the characteristics of the insulating member 4, thereby preventing the insulating member 4 from having insulation failure.

[0033] When this range is met, the connection strength between the pressure plate 3 and the pole 2 can be ensured, and the problem of softening of the insulating member 4 during welding of the pressure plate 3 and the pole 2 can be avoided, thereby preventing the insulating member 4 from failing in insulation. When T is large, or t is large, the insulating member 4 is not prone to softening, and the welding portion 31w and h can be increased appropriately. If the w or h of the welding portion 31 is too small, the connection strength between the pressure plate 3 and the pole 2 is affected, and it is easy to break, resulting in structural damage and sealing failure between the cover plate 1 and the pole 2.

[0034] When measuring w, h, d1 and t, a general length measuring tool such as a vernier caliper may be used.

[0035] Specifically, for w, the distance between the edge on the pressure plate 3 and the other edge on the pole 2 is measured, and the measurement is repeated multiple times and the average value is taken to obtain the width w mm of the weld.

[0036] As for h, the weld 31 may be cut open, and the distance between the surface of the weld 31 on the cross section and the deepest part of the weld 31 may be measured. The depth h mm of the weld 31 may be obtained by taking the average value after multiple measurements.

[0037] For t, the insulating member 4 can be taken, and the distance between the two surfaces of the portion of the insulating member 4 located between the pressing plate 3 and the cover plate 1 can be measured. The measurement is performed multiple times and the average value is taken to obtain the thickness of the flat plate portion 41 as t mm.

[0038] For d1, the distance between the surface of the insulating member 4 facing the pressing plate 3 and the surface of the pressing plate 3 facing away from the insulating member 4 is measured. The measurements are performed multiple times and the average value is taken to obtain that the thickness of the pressing plate 3 is d1 mm.

[0039] T is obtained by testing according to the national standard "GB 1035-70 Plastics Heat Resistance (Martin) Test Method".

[0040] To support the rationality of the above numerical range, this embodiment also conducts strength tests and short-circuit tests on the cover plate assemblies that meet the above numerical range, and uses the tensile force and breakdown voltage as indicator data, and 8 groups are set in this embodiment. At the same time, test data of the cover plate assemblies that do not meet the above numerical range are provided for comparison, and 2 groups are set in this embodiment.

[0041] The connection strength between the pressure plate 3 and the pole 2 is reflected by the tensile test to detect the tensile value. Specifically, 10 batteries are taken for each test, and a tensile block is installed on the surface of the pole 2. The pressure ring is fixed at one end of the tensile machine, and the pole is pulled through the tensile block at the other end. The tensile machine sensor is turned on until the pole 2 falls off. The maximum value in the tensile value curve is the tensile value. The average tensile value is greater than 1200N for passing.

[0042] The insulation performance of the insulating member 4 is reflected by the breakdown voltage. Specifically, 10 batteries are taken for each test. Voltages of different magnitudes are set between the pole 2 and the pressure plate 3 by a voltage source to apply voltages. It is observed whether there are breakdown spark marks and whether the resistance value between the pole 2 and the pressure plate 3 becomes zero after the pressure is applied. If the average breakdown voltage is less than 1200V, it is unqualified.

[0043] Please refer to Table 1 for the test parameters and index data of each group.

[0044] Table 1 It can be seen from the data in Table 1 that the cover plate assembly that meets the above numerical range has higher strength and insulation performance.

[0045] In some embodiments, the width w mm of the welding portion 31, the depth h mm of the welding portion 31, the thermal deformation temperature T°C of the insulating member 4, and the thickness t mm of the flat plate portion 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, etc.

[0046] by Figure 4 In the orientation shown, at least a portion of the welding portion 31 is on the pressing plate 3, and the insulating member 4 generally corresponds to the size of the pressing plate 3, so at least a portion of the welding portion 31 is above the insulating member 4. The welding portion 31 is closer to the insulating member 4, and heat is more easily transferred to the insulating member 4. Therefore, when the range of 0.0009≤w*h / (T*t)≤0.04 is met, the connection strength between the pressing plate 3 and the pole 2 is ensured while preventing the insulating member 4 from softening.

[0047] The depth h mm of the welding portion 31 satisfies: 0.5≤h≤2. Preferably, h can take values ​​such as 0.7, 1, 1.2, 1.5, 1.7, 1.9, etc.

[0048] If h is too large, the welding power is too large, which will lead to a larger molten pool, a larger heat-affected zone, and a greater probability of mechanical fatigue of the weld. If h is too small, the welding strength between the pressure plate 3 and the pole 2 will be low.

[0049] The thermal deformation temperature T°C of the insulating member 4 satisfies: 150≤T≤350. Preferably, T can be 160, 172, 185, 190, 198, 210, 225, 238, 249, 263, 275, 289, 291, 305, 314, 326, 338, 342, etc.

[0050] If T is too small, the insulating member 4 will be easily softened, affecting the insulation performance. If T is too large, the material strength of the insulating member 4 will be reduced, resulting in poor resistance to fracture, and the insulating member 4 will be easily fractured when squeezed after assembly.

[0051] The thickness t mm of the flat plate portion 41 satisfies: 0.5≤t≤1. Preferably, t can be 0.6, 0.7, 0.8, 0.9, etc.

[0052] If t is too large, the insulating member 4 is too thick, which will cause the axial dimension of the pole 2 to be larger, occupying the battery or even the battery pack as a whole. If t is too small, the insulating member 4 is too thin, and the insulating member 4 is more affected by the welding heat of the pressure plate 3 and the pole 2, and is more likely to soften.

[0053] The width w mm of the welding portion 31 satisfies: 0.5≤w≤2. Preferably, w can take values ​​such as 0.7, 0.9, 1, 1.3, 1.5, 1.8, etc.

[0054] If w is too large, the welding power is too large, which will lead to a larger molten pool, a larger heat-affected zone, and a greater probability of mechanical fatigue of the weld. If w is too small, the welding strength between the pressure plate 3 and the pole 2 will be low.

[0055] The pressing plate 3 is annular, and the distance between the outer edge and the inner edge of the pressing plate 3 on the plane where the central axis of the pole 2 is located is w2mm, that is, the ring width of the pressing plate 3 is w2mm, the pole 2 has a protrusion 21, the protrusion 21 is located at one end of the pole 2, the protrusion 21 and the pressing plate 3 are on the same side of the cover plate 1, and the size of the protrusion 21 in the direction perpendicular to the thickness of the cover plate 1 is D mm, that is, the width of the protrusion 21 is D mm, which satisfies: 0.05≤w2 / D≤0.4. Preferably, w2 / D can be 0.1, 0.15, 0.18, 0.2, 0.23, 0.27, 0.3, 0.35, etc.

[0056] In this embodiment, the pole 2 is substantially cylindrical, and the size of the protrusion 21 is reduced compared to the overall size of the pole 2 to form a shoulder shape. The portion where the protrusion 21 is located is also cylindrical, and D is the diameter of this portion.

[0057] When this range is met, the support force of the pressure plate 3 on the pole 2 can be ensured, and the size of the pole 2 can be ensured to be sufficient, which will not affect the overcurrent of the battery. If w2 / D is too small, the support force of the pressure plate 3 on the pole 2 will be insufficient, and if w2 / D is too large, the size of the pressure plate 3 will be too large, thereby occupying the space of the pole 2, resulting in a reduction in the size of the pole 2, which affects the overcurrent of the battery.

[0058] 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.

[0059] D also satisfies: 10≤D≤40. Preferably, D can take values ​​such as 13, 16, 19, 25, 29, 34, 38, etc.

[0060] When measuring D and w2, a general length measuring tool such as a vernier caliper may be used.

[0061] Specifically, for D, the maximum width of the protrusion 21 is measured in a direction perpendicular to the thickness of the cover plate 1 , and the measurement is repeated multiple times and the average value is taken, so that the width of the protrusion 21 is D mm.

[0062] For w2, the distance between the outer edge and the inner edge of the pressing plate 3 on the plane where the central axis of the pole 2 is located is measured, and the measurement is repeated multiple times and the average value is taken to obtain the ring width w2mm of the pressing plate 3.

[0063] The insulating member 4 further includes a first vertical portion 42, a flat portion 41 is disposed between the pressing plate 3 and the cover plate 1, one end of the first vertical portion 42 is connected to the flat portion 41, one end of the first vertical portion 42 away from the flat portion 41 and the pressing plate 3 are respectively located on both sides of the flat portion 41, the first vertical portion 42 is located in the mounting hole 11, the surface of the first vertical portion 42 facing the pole 2 is at least partially attached to the pole 2, and the dimension of the first vertical portion 42 in the thickness direction of the cover plate 1 is d2 mm, satisfying: 0.3≤d2≤1. Preferably, d2 can also take values ​​such as 0.5, 0.7, and 0.9.

[0064] In this embodiment, the first vertical portion 42 is arranged at one end of the flat portion 41 facing the pole 2. The first vertical portion 42 is arranged around the outside of the pole 2 and extends in the mounting hole 11 toward the direction of the battery cell in the battery. The first vertical portion 42 can separate the cover plate 1 and the pole 2, playing a certain sealing role.

[0065] When d2 meets this range, the size of the first vertical portion 42 is ensured to avoid heat shrinkage and sealing failure. However, if d2 is too large, the second vertical portion 43 is likely to interfere with the mounting hole 11, the seal 5 and the lower flange of the pole 2 during assembly, limiting the height of the pole 2. If d2 is too small, it is likely to shrink due to heat, affecting the sealing effect.

[0066] The battery cover plate 1 assembly also includes a seal 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 pressure plate 3, and the projection of the seal 5 on the cover plate 1 coincides with the projection of the insulating member 4 on the cover plate 1.

[0067] When measuring d2, a general length measuring tool such as a vernier caliper may be used.

[0068] 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 distance is measured multiple times and the average value is taken to obtain the dimension d2 mm of the first vertical portion 42 in the thickness direction of the cover plate 1 .

[0069] The seal 5 is at least partially disposed on the plate surface of the cover plate 1 facing the direction of the battery cell, and the seal 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.

[0070] The thermal deformation temperature T°C of the insulating member 4 and the thickness t mm of the flat plate portion 41 also satisfy: 75≤T*t≤350. Preferably, T*t can also be 80, 86, 94, 100, 112, 129, 145, 165, 179, 191, 216, 237, 254, 269, 276, 294, 310, 325, 338, 342, etc.

[0071] When this range is met, the insulating member 4 plays a role in blocking the welding heat of the pressure plate 3 and the pole 2 from being transferred to the sealing member 5, thereby avoiding sealing failure.

[0072] In this embodiment, the sealing member 5 is a sealing ring.

[0073] The insulating member 4 further includes a second vertical portion 43, one end of which is connected to the flat plate portion 41, and the second vertical portion 43 is wrapped around the outer peripheral surface of the pressing plate 3. In the direction perpendicular to the thickness of the cover plate 1, the minimum distance between the second vertical portion 43 and the welding portion 31 is d mm, satisfying: 0.5≤d≤3.5. Preferably, d can also be 0.8, 1.2, 1.5, 1.8, 2.3, 2.6, 2.9, 3.2, 3.4, etc.

[0074] The second vertical portion 43 can avoid the risk of short circuit caused by overlapping of metal wires between the side periphery of the pressing plate 3 and the cover plate 1. In this embodiment, the second vertical portion 43 is arranged at an end of the flat plate portion 41 away from the pole 2.

[0075] When d is too small, the distance between the second vertical portion 43 and the welding portion 31 is smaller, and the probability that the second vertical portion 43 is damaged by welding heat is greater; when d is too large, the distance between the second vertical portion 43 and the welding portion 31 is larger, which is equivalent to that the distance w2 between the outer edge and the inner edge of the pressure plate 3 on the plane where the central axis of the pole 2 is located is too large, which is not conducive to the flow of current through the pole 2.

[0076] When measuring d, a general length measuring tool such as a vernier caliper may be used.

[0077] Specifically, for d, the distance between the surface of the second vertical portion 43 facing the pole 2 and the edge of the welding portion 31 on the pressure plate 3 is measured, and the measurement is performed multiple times and the average value is taken. The distance between the second vertical portion 43 and the welding portion 31 on the plane where the central axis of the pole 2 is located is d mm.

[0078] This embodiment also provides a battery, including the above-mentioned cover plate 1 assembly, which can not only ensure the connection strength between the pressure plate 3 and the pole 2, but also avoid the problem of softening of the insulating member 4 when the pressure plate 3 and the pole 2 are welded, prevent the insulating member 4 from insulation failure, and ensure the quality of the battery.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, which is provided with a mounting hole, wherein the mounting hole penetrates the cover plate along the thickness direction of the cover plate; A pole, which is inserted into the mounting hole; A pressing plate, which is arranged on one side of the plate surface of the cover plate, the pressing plate is arranged around the outer peripheral side of the pole, and the pressing plate is welded to the outer peripheral side of the pole to form a welding portion; An insulating member, comprising a flat plate portion disposed between the pressing plate and the cover plate, wherein the pressing plate has a thickness of d1 mm and satisfies: 1.5≤d1≤3; The width of the welding portion is w mm, the depth of the welding portion is h mm, the thermal deformation temperature of the insulating member is T°C, the thickness of the flat plate portion is t mm, and the following condition is satisfied: 0.0008≤w*h / (T*t)≤0.

045.

2. The battery cover assembly according to claim 1, characterized in that: The projection of the welding portion on the cover plate at least partially overlaps with the projection of the insulating member on the cover plate; The width w mm of the welded portion, the depth h mm of the welded portion, the thermal deformation temperature T° C. of the insulating member, and the thickness t mm of the flat plate portion further satisfy: 0.0009≤w*h / (T*t)≤0.

04.

3. The battery cover assembly according to claim 1, characterized in that: The depth h mm of the welding portion satisfies: 0.5≤h≤2.

4. The battery cover assembly according to claim 1, characterized in that: The thermal deformation temperature T°C of the insulating member satisfies: 150≤T≤350.

5. The battery cover assembly according to claim 1, characterized in that: The thickness t mm of the flat plate portion satisfies: 0.5≤t≤1.

6. The battery cover assembly according to claim 1, characterized in that: The width of the welding portion is w mm and satisfies: 0.5≤w≤2.

7. The battery cover assembly according to claim 1, characterized in that: The pressure plate is ring-shaped, and the ring width of the pressure plate is w2 mm. The pole has a protrusion, and the protrusion is located at one end of the pole. The protrusion and the pressure plate are on the same side of the cover plate. The width of the protrusion is D mm, satisfying: 0.05≤w2 / D≤0.4, wherein the width of the protrusion is the dimension of the protrusion in a direction perpendicular to the thickness of the cover plate.

8. The battery cover assembly according to claim 1, characterized in that: The insulating member also includes a first vertical portion, which is also located in the mounting hole, one end of the first vertical portion is connected to the flat plate portion, one end of the first vertical portion away from the flat plate portion and the pressure plate are respectively located on both sides of the flat plate portion, the surface of the first vertical portion facing the pole is at least partially attached to the pole, and the dimension of the first vertical portion in the thickness direction of the cover plate is d2mm, satisfying: 0.3≤d2≤1.

9. The battery cover assembly according to claim 1, characterized in that: Also includes: A sealing member, which is arranged between the cover plate and the pole, and the sealing member is located on a side of the insulating member away from the pressing plate, and a projection of the sealing member on the cover plate coincides with a projection of the insulating member on the cover plate; Wherein, the thermal deformation temperature T°C of the insulating member and the thickness t mm of the flat plate portion also satisfy: 75≤T*t≤350.

10. The battery cover assembly according to claim 1, characterized in that: The insulating part also includes a second vertical portion, one end of which is connected to the flat plate portion, and the second vertical portion is wrapped around the outer peripheral surface of the pressure plate. In the thickness direction perpendicular to the cover plate, the minimum distance between the second vertical portion and the welding portion is d mm, satisfying: 0.5≤d≤3.

5.

11. A battery, characterized in that: It comprises the cover plate assembly as described in any one of claims 1-10.

Images