Cover plate assembly and battery

Abstract

The utility model relates to battery technical field discloses the cover plate subassembly and battery. Cover plate subassembly includes: the cover plate body is seted up with the pole hole, the pole and riveting block, the pole is worn and is set in the pole hole, the riveting block is along the height direction of cover plate body and is set in the first side of cover plate body, the pole is connected with riveting block, first plastic piece, along the height direction is set in the first side of cover plate body, and at least part of first plastic piece is located between cover plate body and riveting block, the side of first plastic piece to cover plate body is provided with recess, the heat insulating piece is set in recess. Through reserving recess to the side of first plastic piece to cover plate body, and setting heat insulating piece in recess, make the heat insulating structure between first plastic piece and cover plate body, can effectively reduce the welding heat when cover plate body and shell welding through cover plate body and pass to first plastic piece on, thereby circumvents the heat influence of shell cover welding to first plastic piece, avoids the hot melt deformation of first plastic piece, improves the welding process yield.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover plate assembly and a battery. Background Technology

[0002] A battery typically consists of electrode arrays, a casing, and a cover assembly. The cover assembly includes the cover body, terminals, upper plastic, and lower plastic components. The casing and cover body are fixed together by laser welding, forming a sealed space with sufficient mechanical strength to enclose the electrode arrays. The terminals, as key components carrying current and energy in the battery, primarily serve electrical connection and positioning functions. An upper plastic layer is placed between the terminals and the cover body surface to ensure insulation between them.

[0003] In current technologies, to improve the overall energy density of battery packs, the thickness of individual cells is becoming increasingly thinner, meaning the width of the cover plate is smaller. Furthermore, with the increasing demand for fast charging, the battery terminals must also meet higher current requirements, necessitating maximum terminal dimensions. This results in a smaller distance between the terminals and the edge of the cover plate along its width. Consequently, during welding of the cover to the casing, welding heat is transferred along the cover plate to the upper plastic area, easily causing thermal melting and deformation around the upper plastic layer. This increases the risk of insulation failure and severely impacts process yield and battery safety performance. Utility Model Content

[0004] In view of this, the present invention provides a cover plate assembly and a battery to solve the problem that the plastic is easily affected by the welding heat and undergoes thermal melting deformation, leading to insulation failure.

[0005] In a first aspect, the present invention provides a cover plate assembly, comprising: a cover plate body having an electrode post hole; an electrode post and a riveting block, wherein the electrode post passes through the electrode post hole, and the riveting block is disposed on a first side of the cover plate body along the height direction of the cover plate body, and the electrode post is connected to the riveting block; a first plastic part disposed on the first side of the cover plate body along the height direction, and at least a portion of the first plastic part is located between the cover plate body and the riveting block, and a groove is provided on the side of the first plastic part facing the cover plate body; and a heat insulation member disposed in the groove.

[0006] Beneficial effects: By pre-reserving a groove on the side of the first plastic part facing the cover plate body and setting a heat insulation component in the groove, a heat insulation structure is formed between the first plastic part and the cover plate body. This can effectively reduce the heat of welding when the cover plate body is welded to the shell and then transferred to the first plastic part through the cover plate body. This avoids the thermal impact of the shell and cover welding on the first plastic part, prevents the first plastic part from undergoing hot melt deformation, and improves the welding process yield.

[0007] In one optional embodiment, the heat insulation component has a clearance hole, and a positioning post is provided in the groove, with the positioning post passing through the clearance hole.

[0008] Beneficial effects: By opening clearance holes on the heat insulation component and setting corresponding positioning posts in the groove, the positioning of the heat insulation component and the first plastic component during assembly is achieved through the cooperation of the positioning posts and clearance holes, thereby effectively improving the positioning accuracy and assembly efficiency of the heat insulation component and the first plastic component during assembly.

[0009] In one optional implementation, the number of positioning posts is at least two;

[0010] And / or, the dimension of the positioning post along the height direction is greater than the groove depth of the groove along the height direction, the cover plate body is provided with a positioning groove corresponding to the positioning post, and the positioning post is inserted into the positioning groove.

[0011] Beneficial effects: By setting at least two positioning posts, the positioning accuracy of the heat insulation component and the first plastic component is further improved, and the relative rotation of the heat insulation component and the first plastic component after assembly is effectively prevented, thereby improving reliability;

[0012] By setting the dimension of the positioning post along the height direction to be greater than the depth of the groove, the end of the positioning post away from the bottom wall of the groove extends out of the groove, that is, it extends out of the surface of the first plastic part facing the cover plate body. At the same time, a positioning groove corresponding to the positioning post is opened on the cover plate body, so that the first plastic part is inserted into the positioning groove on the cover plate body through the positioning post, realizing the mutual positioning of the first plastic part and the cover plate body, and improving the assembly accuracy of the cover plate assembly.

[0013] In one optional embodiment, the groove depth along the height direction is H1, wherein the value of H1 is in the range of 0.1mm≤H1≤0.2mm;

[0014] And / or, the dimension of the groove along the width direction is equal to the dimension of the first plastic part along the width direction;

[0015] And / or, the groove has a length dimension of L1, and the first plastic part has a length dimension of L0, wherein L1 and L0 satisfy the relationship: 3mm≤L0-L1≤5mm.

[0016] Beneficial effects: By limiting the groove depth H1 to between 0.1mm and 0.2mm, it is possible to ensure that the heat insulation component in the groove has sufficient heat insulation effect, thereby effectively preventing the first plastic part from being deformed by the heat of welding during the welding of the cover. It is also possible to ensure that the first plastic part has sufficient structural strength, thereby preventing it from being damaged during the riveting process of the cover plate assembly, ensuring the insulation between the riveting block and the cover plate body, and improving the reliability of the cover plate assembly.

[0017] The dimension of the groove along the width direction is equal to the dimension of the first plastic part along the width direction, ensuring that the heat insulation part can cover the entire width of the first plastic part, thereby avoiding direct contact between the edge of the first plastic part along the width direction and the cover plate body, further preventing the edge of the first plastic part along the width direction from being affected by welding heat and deformed by heat melting, and facilitating processing;

[0018] By limiting L0-L1 to a value between 3mm and 5mm, the stability of the first plastic part structure can be guaranteed, the limiting function of the first plastic part on the heat insulation part in the length direction can be satisfied, and the first plastic part can be smoothly processed and formed. At the same time, the groove can be guaranteed to have sufficient size in the length direction, thereby ensuring the protection of the first plastic part, avoiding the first plastic part from being deformed by the heat of the shell cover welding, reducing the risk of insulation failure of the first plastic part, and improving the process yield and battery safety performance.

[0019] In one alternative embodiment, the dimension of the heat insulation element along the width direction is larger than the dimension of the first plastic element along the width direction.

[0020] Beneficial effects: By setting the heat insulation component to extend out of the first plastic part along the width direction, the edges of the first plastic part on both sides along the width direction are further prevented from contacting the cover plate body, and the isolation effect of the heat insulation component on the first plastic part and the cover plate body is further strengthened, thereby further reducing the impact of the heat from the welding of the cover on the first plastic part, thereby further preventing the first plastic part from being deformed by heat melting, and ensuring the insulation and stability of the first plastic part.

[0021] In one optional embodiment, the dimension of the heat insulation component along the width direction is W1, and the dimension of the first plastic component along the width direction is W0, wherein W1 and W0 satisfy the relationship: 2mm≤(W1-W0) / 2≤3mm.

[0022] Beneficial effects: By limiting the width of the heat insulation component to 2mm to 3mm beyond the width of the first plastic component, the heat insulation component can ensure the thermal protection of the first plastic component and prevent the first plastic component from being deformed by the heat of the cover welding. It can also prevent the heat insulation component from affecting the assembly and welding of the cover assembly and the shell, thereby improving the assembly yield and assembly efficiency.

[0023] In one alternative embodiment, the dimension of the heat insulation element along its length is equal to the dimension of the groove along its length.

[0024] Beneficial effects: It facilitates the limiting of the heat insulation component by the side walls on both sides of the groove along the length direction, thereby improving the stability of the positional relationship between the heat insulation component and the first plastic component. It also maximizes the protection range provided by the heat insulation component to the first plastic component along the length direction, thereby improving the heat insulation effect and further reducing the risk of the first plastic component melting and deforming due to heat.

[0025] In one optional embodiment, the dimension of the heat insulation element along the height direction ranges from 0.1 mm to 0.2 mm.

[0026] Beneficial effects: By limiting the dimensions of the heat insulation component along the height direction to within the range of 0.1mm to 0.2mm, it is possible to ensure that the heat insulation component has sufficient heat insulation effect and can provide sufficient thermal protection for the first plastic part, thereby preventing the first plastic part from being deformed by heat due to welding. At the same time, it is possible to avoid the gap between the first plastic part and the cover plate body along the height direction caused by the excessive thickness of the heat insulation component, thereby ensuring the stability and reliability of the cover plate assembly.

[0027] In one alternative embodiment, the heat insulation component includes a heat insulation film and a heat insulation adhesive stacked along the height direction, the heat insulation adhesive being bonded to the bottom wall of the groove.

[0028] Beneficial effects: By setting the heat insulation component to be composed of heat insulation film and heat insulation adhesive layers, the heat insulation film has a good heat insulation effect, and the heat insulation adhesive has both heat insulation effect and adhesiveness. The heat insulation component can be bonded to the bottom wall of the groove through the heat insulation adhesive, so that the heat insulation component is firmly connected to the first plastic part, which has high reliability, low cost and is easy to operate.

[0029] Secondly, this utility model also provides a battery, comprising: a housing having an open end; an electrode assembly disposed within the housing; and the aforementioned cover plate assembly covering the open end of the housing. Since the battery includes the cover plate assembly and has the same effect as the cover plate assembly, it will not be described further here. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a cover plate assembly according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the first plastic part and the heat insulation part after assembly according to an embodiment of the present utility model;

[0033] Figure 3 for Figure 2 A structural diagram from the bottom view;

[0034] Figure 4 for Figure 3A schematic diagram showing the positional relationship between the first plastic part and the heat insulation part before assembly;

[0035] Figure 5 This is a schematic diagram of the structure of a first plastic part according to an embodiment of the present utility model;

[0036] Figure 6 for Figure 5 A magnified view of part A in the diagram;

[0037] Figure 7 This is a schematic diagram of the structure of a heat insulation component according to an embodiment of the present utility model;

[0038] Figure 8 for Figure 7 A magnified view of part B in the diagram;

[0039] Figure 9 for Figure 7 A top view of the insulation component shown;

[0040] Figure 10 Figure 9 A cross-sectional view along the CC direction;

[0041] Figure 11 for Figure 7 The diagram shown is a structural schematic of the incoming thermal insulation component.

[0042] Figure 12 This is a schematic diagram of the structure of a cover plate body according to an embodiment of the present utility model;

[0043] Figure 13 This is a schematic diagram of the cover plate assembly before the improvement.

[0044] Figure 14 for Figure 13 The exploded view of the cover plate assembly shown.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Cover plate body; 101. Pole post hole; 102. Positioning groove; 2. Pole post assembly; 210. Pole post; 220. Riveting block; 201. Post body; 202. Plate body; 3. First plastic part; 301. Groove; 302. Positioning post; 303. First through hole; 4. Heat insulation part; 401. Clearance hole; 402. Heat insulation film; 403. Heat insulation adhesive; 404. Second through hole; 5. Release paper; 6. Second plastic part; 601. Third through hole; 7. Sealing ring. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] The following is combined Figures 1 to 14 The following describes embodiments of the present invention.

[0049] According to an embodiment of the present invention, in one aspect, a cover plate assembly is provided, such as... Figures 1 to 12 As shown, the cover plate assembly includes: a cover plate body 1, a pole post assembly 2, a first plastic part 3, and a heat insulation part 4. The cover plate body 1 has a pole post hole 101; a pole post 210 and a riveting block 220, the pole post 210 passing through the pole post hole 101, and the riveting block 220 being disposed on the first side of the cover plate body 1 along the height direction, with the pole post 210 connected to the riveting block 220; the first plastic part 3 is disposed on the first side of the cover plate body 1 along the height direction, and at least a portion of the first plastic part 3 is located between the cover plate body 1 and the riveting block 220, with a groove 301 provided on the side of the first plastic part 3 facing the cover plate body 1; the heat insulation part 4 is disposed in the groove 301. Here, the height direction refers to... Figure 1 The "height direction" indicated by the middle arrow; the cover body 1 has two opposing sides (a first side and a second side) along the height direction. When the cover assembly is assembled on the battery casing, the first side of the cover body 1 faces the outside of the battery and the second side faces the inside of the battery.

[0050] The battery using this embodiment has a pre-reserved groove 301 on the side of the first plastic part 3 facing the cover plate body 1, and a heat insulation member 4 is provided in the groove 301, so that a heat insulation structure is formed between the first plastic part 3 and the cover plate body 1. This can effectively reduce the welding heat when the cover plate body 1 is welded to the shell and transferred to the first plastic part 3 through the cover plate body 1, thereby avoiding the thermal impact of the shell and cover welding on the first plastic part 3, preventing the first plastic part 3 from undergoing hot melt deformation, and improving the welding process yield.

[0051] It should be noted that by setting the heat insulation component 4 in the groove 301 opened on the first plastic part 3, it is possible to avoid opening a groove on the cover plate body 1 to place the heat insulation component 4, thereby improving the reliability of the cover plate assembly. If a sink is opened on the cover plate body 1, if electrolyte enters the sink during the battery manufacturing process, it is not easy to drain and it is easy to contaminate the terminal post, resulting in abnormal cover plate resistance.

[0052] In one embodiment, the terminal post 210 includes a plate 202 and a post 201. The plate 202 is located on the second side of the cover plate body 1, and the post 201 passes through the terminal post hole 101. The end of the post 201 away from the plate 202 is riveted to the riveting block 220. The plate 202 of the terminal post 210 is connected to the electrode tab of the electrode assembly by laser welding to lead the internal current of the battery out of the casing. After the post 201 is welded to the busbar, the current is led out. A first plastic part 3 is disposed between the riveting block 220 and the cover plate body 1 to ensure the insulation between the riveting block 220 and the cover plate body 1. The first plastic part 3 has a first through hole 303 corresponding to the terminal post hole 101, through which the post 201 passes. Optionally, the orthographic projection of the post 201 on a cross section perpendicular to its center line is racetrack-shaped, circular, etc., preferably racetrack-shaped.

[0053] In one embodiment, the first plastic part 3 includes a main body and a side part. The side part is connected around the outer periphery of the main body and extends away from the cover plate body 1 along the height direction, so that the side part wraps around the outer periphery of the rivet block 220, further ensuring the insulation between the cover plate body 1 and the rivet block 220.

[0054] In one embodiment, the heat insulation component 4 has a clearance hole 401, and a positioning post 302 is provided in the groove 301, with the positioning post 302 passing through the clearance hole 401. By providing a clearance hole 401 on the heat insulation component 4 and a positioning post 302 corresponding to the clearance hole 401 in the groove 301, the positioning of the heat insulation component 4 and the first plastic part 3 during assembly is achieved through the cooperation of the positioning post 302 and the clearance hole 401, thereby effectively improving the positioning accuracy and assembly efficiency of the heat insulation component 4 and the first plastic part 3 during assembly.

[0055] In one embodiment, the clearance hole 401 is a through hole extending through the heat insulation member 4 along its height direction, facilitating processing and assembly with the positioning post 302. Here, the height direction refers to... Figure 1 and Figure 10 The middle arrow points to the "height direction".

[0056] In one embodiment, the number of positioning posts 302 is at least two. The number of clearance holes 401 is equal to the number of positioning posts 302 and corresponds one-to-one. By setting the number of positioning posts 302 to at least two, the positioning accuracy of the heat insulation component 4 and the first plastic component 3 is further improved, and relative rotation of the heat insulation component 4 and the first plastic component 3 after assembly is effectively prevented, thereby improving reliability.

[0057] Preferably, there are two positioning posts 302, and the two positioning posts 302 are symmetrical about the center point of the first plastic part 3.

[0058] In one embodiment, the dimension of the positioning post 302 along the height direction is greater than the groove depth of the groove 301 along the height direction. A positioning groove 102 corresponding to the positioning post 302 is provided on the cover plate body 1, and the positioning post 302 is inserted into the positioning groove 102. It should be noted that the axis of the positioning post 302 extends along the height direction, and one end of the positioning post 302 is fixedly connected to the bottom wall of the groove 301. By setting the dimension of the positioning post 302 along the height direction to be greater than the groove depth of the groove 301, the end of the positioning post 302 away from the bottom wall of the groove 301 extends out of the groove 301, that is, out of the surface of the first plastic part 3 facing the cover plate body 1. Simultaneously, a positioning groove 102 corresponding to the positioning post 302 is provided on the cover plate body 1, allowing the first plastic part 3 to be inserted into the positioning groove 102 on the cover plate body 1 via the positioning post 302, thereby achieving mutual positioning between the first plastic part 3 and the cover plate body 1 and improving the assembly accuracy of the cover plate assembly.

[0059] In one embodiment, further combination Figures 5 to 6 As shown, the groove depth of groove 301 along the height direction is H1, where the value of H1 ranges from 0.1mm ≤ H1 ≤ 0.2mm. If H1 is less than 0.1mm, the groove depth is too shallow, and correspondingly, the thickness of the heat insulation component 4 is too small, providing limited heat insulation effect, and there is still a risk that the first plastic component 3 will melt due to welding heat; if H1 is greater than 0.2mm, the groove depth is too deep, and the thickness of the remaining solid part of the first plastic component 3 after removing groove 301 along the height direction is too small, resulting in insufficient structural strength of the first plastic component 3, which is prone to damage during riveting. Therefore, by limiting the groove depth H1 of the groove 301 to between 0.1 mm and 0.2 mm, it is possible to ensure that the heat insulation component 4 located in the groove 301 has sufficient heat insulation effect, thereby effectively preventing the first plastic part 3 from being deformed by the welding heat during the welding of the cover, and also to ensure that the first plastic part 3 has sufficient structural strength, thereby preventing it from being damaged during the riveting process of the cover assembly, ensuring the insulation between the riveting block 220 and the cover body 1, and improving the reliability of the cover assembly.

[0060] In one embodiment, further combination Figures 4 to 5 As shown, the dimension of the groove 301 along the width direction is equal to the dimension of the first plastic part 3 along the width direction, ensuring that the heat insulation part 4 can cover the entire width of the first plastic part 3. This avoids direct contact between the edge of the first plastic part 3 along the width direction and the cover plate body 1, further preventing the edge of the first plastic part 3 along the width direction from being affected by welding heat and undergoing heat melting deformation, and also facilitating processing. Here, the width direction refers to... Figure 5 and Figure 1 The middle arrow points to the "width direction".

[0061] In one embodiment, there is one groove 301, the first through hole 303 on the first plastic part 3 is located at the center of the groove 301, and there is one heat insulation part 4, which is provided with a second through hole 404 corresponding to the first through hole 303 so that the column 201 can pass through.

[0062] In one embodiment, further combination Figure 5 As shown, the dimension of the groove 301 along its length is L1, and the dimension of the first plastic part 3 along its length is L0. L1 and L0 satisfy the relationship: 3mm ≤ L0 - L1 ≤ 5mm. Here, the length direction refers to... Figure 5 The arrow points to the "length direction". If L0-L1 is less than 3mm, the groove 301 is too close to the edge of the first plastic part 3 along the length direction, making processing difficult. Also, the remaining solid portion on both sides of the groove 301 along the length direction of the first plastic part 3 is too small, resulting in poor structural strength and support. It is difficult to limit the heat insulation component 4 in the groove 301, and the stability of the first plastic part 3 is poor. If L0-L1 is greater than 5mm, the groove 301 is too far from the edge of the first plastic part 3 along the length direction. There is too much remaining solid portion on both sides of the groove 301 along the length direction of the first plastic part 3. This portion cannot be protected by the heat insulation component 4 and is easily affected by the heat of the shell cover welding, resulting in heat melting and deformation, increasing the risk of insulation failure of the first plastic part 3.

[0063] Therefore, by limiting L0-L1 to a value between 3mm and 5mm, the stability of the first plastic part 3 structure can be guaranteed, the limiting function of the first plastic part 3 on the heat insulation part 4 in the length direction can be satisfied, and the first plastic part 3 can be smoothly processed and formed. At the same time, the groove 301 can be guaranteed to have sufficient size in the length direction, thereby ensuring the protection of the first plastic part 3, avoiding the first plastic part from being deformed by the heat of the shell cover welding, reducing the risk of insulation failure of the first plastic part 3, and improving the process yield and battery safety performance.

[0064] In other embodiments, the number of grooves 301 can also be multiple, with multiple grooves 301 spaced apart along the width direction. The dimension of each groove 301 along the width direction is equal to the dimension of the first plastic part 3 along the width direction. The distance between two adjacent grooves 301, two grooves 301 located on both sides along the length direction and the edge distance of the first plastic part 3 along the length direction is 3mm to 5mm.

[0065] In one embodiment, further combination Figures 1 to 3As shown, the dimension of the heat insulation component 4 along the width direction is larger than that of the first plastic component 3 along the width direction. By setting the heat insulation component 4 to extend beyond the first plastic component 3 along the width direction, it further avoids the edges of the first plastic component 3 on both sides along the width direction from contacting the cover plate body 1, further strengthening the isolation effect of the heat insulation component 4 on the first plastic component 3 and the cover plate body 1, thereby further reducing the impact of the heat from the welding of the cover on the first plastic component 3, thereby further avoiding the heat-melting deformation of the first plastic component 3, and ensuring the insulation and stability of the first plastic component 3.

[0066] In one embodiment, further combination Figure 5 and Figure 9 As shown, the dimension of the heat insulation component 4 along the width direction is W1, and the dimension of the first plastic component 3 along the width direction is W0. W1 and W0 satisfy the relationship: 2mm ≤ (W1-W0) / 2 ≤ 3mm. Here, (W1-W0) / 2 represents the single-sided dimension of the heat insulation component 4 extending beyond the first plastic component 3 along the width direction. If (W1-W0) / 2 is less than 2mm, the dimension of the heat insulation component 4 extending beyond the first plastic component 3 along the width direction is too small, and the heat from the welding of the cover may still pass through the heat insulation component 4 and reach the first plastic component 3, resulting in poor protection for the first plastic component 3. If (W1-W0) / 2 is greater than 3mm, the dimension of the heat insulation component 4 extending beyond the first plastic component 3 along the width direction is too large, which may interfere with the sides of the cover body 1 along the width direction, affecting the assembly and welding of the cover assembly and the shell.

[0067] Therefore, by limiting the width of the heat insulation component 4 to exceed the width of the first plastic component 3 by 2mm to 3mm, it is possible to ensure the heat protection effect of the heat insulation component 4 on the first plastic component 3, avoid the first plastic component 3 from being deformed by the heat of the shell cover welding, and also avoid the heat insulation component 4 from affecting the assembly and welding of the cover plate assembly and the shell, thereby improving the assembly yield and assembly efficiency.

[0068] In one embodiment, further combination Figure 3 As shown, the dimension of the heat insulation component 4 along the length direction is equal to the dimension of the groove 301 along the length direction. This facilitates the side walls of the groove 301 along the length direction to limit the heat insulation component 4, thereby improving the stability of the positional relationship between the heat insulation component 4 and the first plastic part 3. It also maximizes the protection range provided by the heat insulation component 4 to the first plastic part 3 along the length direction, thereby improving the heat insulation effect and further reducing the risk of the first plastic part 3 melting and deforming due to heat.

[0069] In one embodiment, the dimension of the heat insulation element 4 along the height direction ranges from 0.1 mm to 0.2 mm. Here, the height direction refers to... Figure 1 and Figure 10The middle arrow points to the "height direction". The dimension of the heat insulation component 4 along the height direction is the thickness of the heat insulation component 4. If the dimension of the heat insulation component 4 along the height direction is less than 0.1mm, the thickness of the heat insulation component 4 is too small, the heat insulation effect is too poor, and it is difficult to protect the first plastic part 3. If the dimension of the heat insulation component 4 along the height direction is greater than 0.2mm, the thickness of the heat insulation component 4 is too large, and the surface of the heat insulation component 4 protruding too much from the first plastic part 3 on the side facing the cover plate body 1 will result in a gap between the first plastic part 3 and the cover plate body 1 after assembly, resulting in poor stability.

[0070] Therefore, by limiting the dimension of the heat insulation component 4 along the height direction to within the range of 0.1mm to 0.2mm, it is possible to ensure that the heat insulation component 4 has sufficient heat insulation effect and can provide sufficient thermal protection for the first plastic part 3, thereby preventing the first plastic part 3 from being deformed by the heat of welding. At the same time, it is possible to avoid the heat insulation component 4 being too thick, which would cause a gap between the first plastic part 3 and the cover plate body 1 along the height direction, thereby ensuring the stability and reliability of the cover plate assembly.

[0071] In one embodiment, further combination Figure 10 As shown, the heat insulation component 4 includes a heat insulation film 402 and a heat insulation adhesive 403 stacked along the height direction. The heat insulation adhesive 403 is bonded to the bottom wall of the groove 301. The bottom wall of the groove 301 refers to the wall surface of the groove 301 facing the cover plate body 1 along the height direction. By setting the heat insulation component 4 to be composed of a heat insulation film 402 and a heat insulation adhesive 403, the heat insulation film 402 has a good heat insulation effect, and the heat insulation adhesive 403 has both heat insulation effect and adhesive properties. The heat insulation component 4 can be bonded to the bottom wall of the groove 301 using the heat insulation adhesive 403, making the heat insulation component 4 firmly connected to the first plastic part 3. This results in high reliability, low cost, and ease of operation.

[0072] Further integration Figure 11 As shown, during the assembly of the cover plate assembly, when the heat insulation component 4 arrives, a layer of release paper 5 is attached to the side of the heat insulation component 4 with heat insulation adhesive 403. After removing the release paper 5, the heat insulation component 4 is first pasted into the groove 301 on the first plastic component 3, and then assembled with other loose parts.

[0073] In one embodiment, the cover plate assembly further includes: a second plastic part 6, which is disposed on the side of the cover plate body 1 away from the first plastic part 3. The second plastic part 6 has a third through hole 601 for the column 201 to pass through. The plate body 202 is located on the side of the second plastic part 6 away from the cover plate body 1. The plate body 202 presses the second plastic part 6 against the cover plate body 1. The second plastic part 6 is used to ensure the insulation between the cover plate body 1 and the electrode group, and between the cover plate body 1 and the plate body 202.

[0074] In one embodiment, the first plastic part 3 is the upper plastic part, and the second plastic part 6 is the lower plastic part.

[0075] In one embodiment, the cover plate assembly further includes a sealing ring 7, which is disposed between the column 201 and the pole hole 101 to ensure the insulation and sealing between the column 201 and the cover plate body 1.

[0076] In one embodiment, the cover plate assembly further includes an explosion-proof valve, and the cover plate body 1 is provided with an explosion-proof valve hole. The explosion-proof valve is disposed in the explosion-proof valve hole. The explosion-proof valve is adapted to open when the gas pressure inside the battery cell reaches a preset value, so as to timely discharge the high-temperature smoke in the battery cell and prevent the battery cell from exploding. An explosion-proof patch is attached to the explosion-proof valve to protect it.

[0077] The original cover assembly, such as Figures 13 to 14 As shown, there is no thermal protection structure between the first plastic part 3 and the cover plate body 1. The first plastic part 3 is close to the edge of the cover plate body 1, making it susceptible to the effects of welding heat when the cover plate body 1 is welded to the shell. In this embodiment, the cover plate assembly has a groove on the side of the first plastic part 3 facing the cover plate body 1, and a heat insulation element 4 is added in the groove 301 to block the welding heat propagation path when the shell and the cover plate body 1 are welded. This protects the first plastic part 3 from heat and improves the yield of the battery cell manufacturing process.

[0078] According to an embodiment of the present invention, another aspect provides a battery, comprising: a housing, an electrode assembly, and the aforementioned cover assembly. The housing has an open end; the electrode assembly is disposed within the housing; and the cover assembly covers the open end of the housing.

[0079] Preferably, the battery is a lithium-ion battery. As a common type of battery, lithium-ion batteries are widely used in various fields such as transportation power supply, power storage power supply, new energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high working voltage, strong charge retention capacity and long cycle life.

[0080] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cover assembly, characterized by include: The cover plate body has pole hole; The pole and the rivet block are provided, wherein the pole is inserted into the pole hole and the rivet block is disposed on the first side of the cover plate body along the height direction of the cover plate body, and the pole and the rivet block are connected. A first plastic part is disposed on a first side of the cover plate body along the height direction, and at least a portion of the first plastic part is located between the cover plate body and the riveting block, and a groove is provided on the side of the first plastic part facing the cover plate body. A heat insulation element is disposed in the groove.

2. The cover plate assembly of claim 1, wherein, The heat insulation component has a clearance hole, and a positioning post is provided in the groove, with the positioning post passing through the clearance hole.

3. The cover plate assembly of claim 2, wherein, The number of positioning posts is at least two; And / or, the dimension of the positioning post along the height direction is greater than the groove depth of the groove along the height direction, the cover plate body is provided with a positioning groove corresponding to the positioning post, and the positioning post is inserted into the positioning groove.

4. The cover plate assembly of claim 1, wherein, The groove depth along the height direction is H1, where the value of H1 is in the range of 0.1mm≤H1≤0.2mm; And / or, the dimension of the groove along the width direction is equal to the dimension of the first plastic part along the width direction; And / or, the groove has a length dimension of L1, and the first plastic part has a length dimension of L0, wherein L1 and L0 satisfy the relationship: 3mm≤L0-L1≤5mm.

5. The cover plate assembly of claim 1, wherein, The dimension of the heat insulation component along the width direction is larger than the dimension of the first plastic component along the width direction.

6. The cover plate assembly of claim 5, wherein, The dimension of the heat insulation component along the width direction is W1, and the dimension of the first plastic component along the width direction is W0. The relationship between W1 and W0 is: 2mm≤(W1-W0) / 2≤3mm.

7. The cover plate assembly of claim 1, wherein, The dimension of the heat insulation element along its length is equal to the dimension of the groove along its length.

8. The cover plate assembly of claim 1, wherein, The dimensions of the heat insulation component along the height direction range from 0.1 mm to 0.2 mm.

9. The cover plate assembly of any one of claims 1 to 8, wherein, The heat insulation component includes a heat insulation film and a heat insulation adhesive stacked along the height direction, and the heat insulation adhesive is bonded to the bottom wall of the groove.

10. A battery, characterized by include: The shell has an open end; The electrode assembly is disposed within the housing; The cover assembly according to any one of claims 1 to 9 is provided covering the opening end of the housing.

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