Cover plate assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly and a battery, and the cover plate assembly comprises a cover plate, lower plastic cement and a supporting structure, an anti-explosion valve is arranged on the cover plate; the lower plastic is connected with the cover plate, a pressure relief cavity is arranged between the lower plastic and the cover plate, and the pressure relief cavity is communicated with the anti-explosion valve; the supporting structure is arranged in the pressure relief cavity and fixedly connected with the lower plastic. Due to the fact that the supporting structure is arranged in the pressure relief cavity and connected between the cover plate and the pole group in an abutting mode, after the temperature in the battery rises sharply, the lower plastic is melted at the high temperature, the pressure relief cavity is kept unblocked, it is guaranteed that the anti-explosion valve is not blocked by the pole group, normal exhaust and pressure relief are guaranteed, and the safety performance of the battery is improved.

Description

Technical Field

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

[0002] Lithium-ion cover plate assemblies are widely used in electric vehicles and energy storage fields as power cover plate assemblies, and the performance and safety performance requirements of lithium-ion cover plate assemblies are also increasing.

[0003] The traditional square lithium cover assembly includes a shell and a cover assembly, which are welded to seal the electrode group inside the shell. The cover assembly has a limit structure for abutting and limiting the electrode group, such as lower plastic. The cover assembly is equipped with an explosion-proof valve to open the exhaust when the cover assembly has thermal runaway.

[0004] For the above-mentioned traditional lithium cover assembly, when thermal runaway occurs, the temperature inside the cover assembly rises sharply, the gas production inside the cover assembly reaches the trigger condition, the explosion-proof valve opens, and the gas production inside the cover assembly is quickly discharged. The electrode group will be at risk of being pushed toward the cover assembly by the airflow. The lower plastic that limits the electrode group is made of PP material, and its melting temperature is 160°C. At this time, the temperature inside the cover assembly is too high, and the lower plastic will completely melt under high temperature. The electrode group loses its limit and is easily blocked by the airflow after being pushed up by the airflow. The explosion-proof valve cannot be exhausted and decompressed normally, which accelerates the loss of control of the cover assembly and poses a great safety risk. Utility Model Content

[0005] In view of this, the utility model provides a cover plate assembly and a battery to solve the problem that the explosion-proof valve is easily blocked and the safety is poor when the cover plate assembly has thermal runaway.

[0006] In the first aspect, the utility model provides a cover assembly, including a cover, a lower plastic and a support structure. The cover is provided with an explosion-proof valve; the lower plastic is connected to the cover, a pressure relief chamber is provided between the lower plastic and the cover, and the pressure relief chamber is connected to the explosion-proof valve; the support structure is provided in the pressure relief chamber and is fixedly connected to the lower plastic.

[0007] Beneficial effects: Since the pressure relief chamber between the lower plastic and the cover plate is connected to the explosion-proof valve, when thermal runaway occurs inside the battery, the generated gas will enter the pressure relief chamber and act on the explosion-proof valve, and the explosion-proof valve will open to release pressure. Since the explosion-proof valve is open, the pressure at the explosion-proof valve is small, and the airflow inside the battery acts on the pole group, pushing the pole group toward the cover plate. At this time, after the temperature inside the battery rises sharply, the lower plastic melts at high temperature, and the pole group loses the limit of the lower plastic and is pushed toward the cover plate by the airflow. However, since a support structure is provided in the pressure relief chamber, the support structure abuts between the cover plate and the pole group, so as to keep the pressure relief chamber unobstructed, ensure that the explosion-proof valve is not blocked by the pole group, ensure normal exhaust and pressure relief, and improve the safety performance of the battery.

[0008] In an optional embodiment, the lower plastic is provided with a groove, the groove is arranged corresponding to the explosion-proof valve, a vent hole is provided at the bottom of the groove, and a pressure relief chamber is formed between the groove and the cover plate; the supporting structure is connected to the bottom of the groove.

[0009] Beneficial effects: The pressure relief chamber is formed in this way, which has a simple structure, is easy to process and has low cost. The support structure is connected to the bottom of the groove, that is, the support structure is arranged in the groove, and in the thickness direction, it does not occupy much space in the thickness direction of the cover plate.

[0010] In an optional embodiment, the support structure includes a bracket, the bracket includes a connecting section and at least one supporting section protruding in a direction away from the lower plastic, and the connecting section is fixedly connected to the lower plastic.

[0011] Beneficial effect: The supporting structure adopts a bracket and a connecting section arranged on the bracket. Such an arrangement has a simple structure and is light in weight. While serving as a pressure relief channel between the supporting electrode group and the cover plate and improving the safety performance of the battery, it is beneficial to reduce the overall weight of the battery.

[0012] In an optional embodiment, the height of the upper surface of the supporting section of the bracket protruding from the upper surface of the connecting section is not less than 3 mm.

[0013] Beneficial effect: With this arrangement, when thermal runaway occurs in the battery and the lower plastic melts, the support section of the bracket can effectively support the electrode group, ensuring that the explosion-proof valve is not blocked by the electrode group and can normally exhaust and release air.

[0014] In an optional embodiment, the bracket is made of copper and is arranged on the negative electrode side away from the battery.

[0015] Beneficial effect: This arrangement can prevent the negative electrode point from being too low due to a micro short circuit of the battery, lithium ions from being embedded in aluminum and causing corrosion, which can damage the mechanical properties of the bracket and affect the supporting function of the bracket.

[0016] In an optional embodiment, a gap of not less than 0.2 mm is left between the upper surface of the support segment and the cover plate.

[0017] Beneficial effect: This arrangement can prevent the bracket and the cover from scratching each other due to vibration and impact of the battery, thereby reducing the risk of micro-short circuit inside the battery.

[0018] In an optional embodiment, when projected along a direction perpendicular to the cover plate, the support structure and the explosion-proof valve do not completely overlap.

[0019] Beneficial effect: Since the support structure is arranged in the groove of the lower plastic, the groove of the lower plastic and the explosion-proof valve are arranged correspondingly for exhaust and pressure relief, the support structure and the explosion-proof valve do not completely overlap, thereby preventing the support structure from flying out of the opening of the explosion-proof valve under the action of air pressure when the explosion-proof valve is opened.

[0020] In an optional embodiment, the support structure includes a long strip structure, the long side of the support structure is arranged along the length direction of the cover plate, and the total length of the support structure is greater than the length of the explosion-proof valve; or, the long side of the support structure is arranged along the width direction of the cover plate, and the total length of the support structure is greater than the width of the explosion-proof valve.

[0021] Beneficial effect: This arrangement can ensure that the support structure plays a supporting role while preventing the support structure from being pushed out of the explosion-proof valve under the action of airflow when the explosion-proof valve is opened, thereby ensuring effective support of the support structure.

[0022] In an optional embodiment, the lower plastic includes a separate positive electrode lower plastic and a negative electrode lower plastic, a first recessed section is provided at one end of the positive electrode lower plastic, a second recessed section is provided at one end of the negative electrode lower plastic, the positive electrode lower plastic and the negative electrode lower plastic are respectively connected to the cover plate, the vent holes are provided in the first recessed section and / or the second recessed section, and the first recessed section and the second recessed section are spliced ​​to form a groove.

[0023] Beneficial effects: The positive electrode lower plastic and the negative electrode lower plastic are separately arranged, which is convenient for processing and connected to the cover plate respectively, which is convenient for assembly.

[0024] In an optional embodiment, the connecting section and the lower plastic are fixedly connected by a first connecting structure; the first connecting structure includes connecting holes and connecting columns that cooperate with each other, the connecting section and the lower plastic of the bracket, one of which is provided with a connecting hole, and the other of which is provided with a connecting column, and the connecting column and the connecting hole are fixedly connected by hot melting after being plugged in; or, the connecting section and the lower plastic are fixedly connected by a second connecting structure, the second connecting structure includes a clamping hole and a clamping column that cooperate with each other, the connecting section and the lower plastic of the bracket, one of which is provided with a clamping hole, and the other of which is provided with a clamping column, the clamping column is provided with a clamping rib, the clamping column is plugged into the clamping hole, and is fixed by the clamping rib; or, the connecting section and the lower plastic are fixedly connected by a third connecting structure, the third connecting structure includes a threaded hole provided in the lower plastic, a through hole provided in the connecting section of the bracket, and a fastener that cooperates with the threaded hole, and the fastener passes through the through hole of the connecting section and is threadedly connected with the threaded hole of the lower plastic.

[0025] Beneficial effects: By adopting the above three specific connection methods, the bracket and the lower plastic can be fixedly connected, and the structure is simple, easy to assemble, and the processing cost is low. Of course, other connection methods can also be adopted, depending on the specific situation.

[0026] In a second aspect, the utility model further provides a battery, comprising a housing and a cover assembly as described in any one of the above technical solutions. The housing has a receiving cavity and an open end; the cover assembly is arranged at the open end of the housing.

[0027] Because the battery includes a cover plate assembly, it has the same effect as the cover plate assembly and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a front view of a battery according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 The battery is shown in cross-section along AA;

[0031] Figure 3 for Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0032] Figure 4 for Figure 3 A schematic diagram of the exploded structure of a cover assembly shown;

[0033] Figure 5 for Figure 4 A schematic diagram of the local enlarged structure at E in the middle;

[0034] Figure 6 A cross-sectional view of another battery according to an embodiment of the present utility model;

[0035] Figure 7 for Figure 6 A partial enlarged schematic diagram of point C in the middle;

[0036] Figure 8 for Figure 7 A schematic diagram of the exploded structure of a cover assembly shown;

[0037] Fig. 9 A cross-sectional view of another battery according to an embodiment of the present utility model;

[0038] Fig.10 for Fig. 9 A partial enlarged schematic diagram of point D in the middle;

[0039] Fig.11 for Fig.10 A schematic diagram of the exploded structure of a cover assembly is shown.

[0040] Description of reference numerals:

[0041] 1. Cover plate; 2. Lower plastic; 21. Groove; 22. Vent; 23. Positive electrode lower plastic; 24. Negative electrode lower plastic; 3. Support structure; 31. Bracket; 311. Connecting section; 312. Supporting section; 4. Explosion-proof valve; 51. Connecting hole; 52. Connecting column; 61. Snap-on hole; 62. Snap-on column; 621. Snap-on rib; 71. Threaded hole; 72. Through hole; 73. Fastener; 10. Battery; 101. Shell; 102. Pole group; 103. Cover plate assembly. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0043] Combine the following Figures 1 to 11 , describing an embodiment of the utility model.

[0044] According to an embodiment of the utility model, on the one hand, a cover plate assembly 103 is provided, comprising a cover plate 1, a lower plastic 2 and a support structure 3. An explosion-proof valve 4 is provided on the cover plate 1; the lower plastic 2 is connected to the cover plate 1, a pressure relief chamber is provided between the lower plastic 2 and the cover plate 1, and the pressure relief chamber is connected to the explosion-proof valve 4; the support structure 3 is provided in the pressure relief chamber and fixedly connected to the lower plastic 2.

[0045] Since the pressure relief chamber between the lower plastic 2 and the cover plate 1 is connected to the explosion-proof valve 4, when thermal runaway occurs inside the battery 10, the generated gas will enter the pressure relief chamber and act on the explosion-proof valve 4, and the explosion-proof valve 4 will open to release pressure. Since the explosion-proof valve 4 is open, the pressure at the explosion-proof valve 4 is small, and the airflow inside the battery 10 acts on the pole group 102, which will push the pole group 102 toward the cover plate 1. At this time, after the temperature inside the battery 10 rises sharply, the lower plastic 2 at high temperature melts, and the pole group 102 loses the limit of the lower plastic 2 and is pushed toward the cover plate 1 by the airflow. However, since the support structure 3 is set in the pressure relief chamber, the support structure 3 abuts between the cover plate 1 and the pole group 102, so as to keep the pressure relief chamber unobstructed, ensure that the explosion-proof valve 4 is not blocked by the pole group 102, ensure normal exhaust and pressure relief, and improve the safety performance of the battery 10.

[0046] In one embodiment, the lower plastic 2 is provided with a groove 21, the groove 21 is arranged corresponding to the explosion-proof valve 4, the bottom of the groove 21 is provided with a vent hole 22, and a pressure relief chamber is formed between the groove 21 and the cover plate 1; the support structure 3 is connected to the bottom of the groove 21.

[0047] By setting the groove 21, and setting the vent 22 at the bottom of the groove 21, when thermal runaway occurs inside the battery 10, the generated gas can enter the pressure relief chamber through the vent 22, and then reach the explosion-proof valve 4. When the air pressure reaches the set value, the explosion-proof valve 4 opens to exhaust and release the pressure. The pressure relief chamber is formed in this way, which has a simple structure, is easy to process, and has low cost. The support structure 3 is connected to the bottom of the groove 21, that is, the support structure 3 is arranged in the groove 21, and in the thickness direction, it does not occupy much space in the thickness direction of the cover plate 1.

[0048] In one embodiment, the support structure 3 includes a bracket 31 , and the bracket 31 includes a connecting section 311 and at least one supporting section 312 protruding in a direction away from the lower plastic 2 . The connecting section 311 is fixedly connected to the lower plastic 2 .

[0049] The support structure 3 adopts a bracket 31 and a connecting section 311 arranged on the bracket 31. This arrangement has a simple structure and is light in weight. It can support the pressure relief channel between the electrode group 102 and the cover plate 1, improve the safety performance of the battery 10, and help reduce the overall weight of the battery 10.

[0050] In one embodiment, the height of the upper surface of the supporting section 312 of the bracket 31 protruding from the upper surface of the connecting section 311 is not less than 3 mm.

[0051] This arrangement enables the support section 312 of the bracket 31 to effectively support the electrode group 102 when the battery 10 experiences thermal runaway and the lower plastic 2 melts, thereby ensuring that the explosion-proof valve 4 is not blocked by the electrode group 102 and that the exhaust and pressure relief can be performed normally. Specifically, except for the explosion-proof valve 4, the cross-sectional area of ​​the space between the cover plate 1 and the electrode group 102 is larger than the exhaust area of ​​the explosion-proof valve 4, depending on the specific situation. The cross-sectional area here is the area of ​​the cross section parallel to the explosion-proof valve 4.

[0052] In one embodiment, the support structure 3 is made of high temperature resistant and electrolyte resistant materials, including stainless steel, copper and aluminum. When the bracket 31 is made of aluminum, the thickness of the bracket 31 is not less than 0.5 mm; when the bracket 31 is made of copper, the thickness of the bracket 31 is not less than 0.3 mm; when the bracket 31 is made of stainless steel, the thickness of the bracket 31 is not less than 0.2 mm. With this arrangement, the bracket 31 has a strong ability to resist impact deformation. When the battery 10 has thermal runaway, the bracket 31 can resist the impact of the airflow pushing the pole group 102 to move on the bracket 31, thereby improving the reliability of the support function of the bracket 31.

[0053] In one embodiment, the bracket 31 is made of copper and is disposed at a side away from the negative electrode of the battery 10 .

[0054] This arrangement can prevent the negative electrode point from being too low due to a micro-short circuit of the battery 10 , lithium ions from being embedded in aluminum and causing corrosion, which can damage the mechanical properties of the bracket 31 and affect the supporting function of the bracket 31 .

[0055] In one embodiment, a gap of not less than 0.2 mm is left between the upper surface of the support segment 312 and the cover plate 1 .

[0056] This arrangement can prevent the bracket 31 and the cover plate 1 from scratching each other and generating metal chips due to vibration and impact of the battery 10, thereby reducing the risk of micro short circuit inside the battery 10.

[0057] In one embodiment, projected along a direction perpendicular to the cover plate 1 , the support structure 3 and the explosion-proof valve 4 do not completely overlap.

[0058] Since the support structure 3 is arranged in the groove 21 of the lower plastic 2, the groove 21 of the lower plastic 2 and the explosion-proof valve 4 are correspondingly arranged for exhaust and pressure relief, the support structure 3 and the explosion-proof valve 4 do not completely overlap, thereby preventing the support structure 3 from flying out of the opening of the explosion-proof valve 4 under the action of air pressure when the explosion-proof valve 4 is opened.

[0059] In addition, since the support structure 3 is arranged in the groove 21 of the lower plastic 2, the support structure 3 will occupy part of the exhaust area. Therefore, the support structure 3 should not be too large to ensure that the air intake area of ​​the pressure relief chamber is not less than the exhaust port area of ​​the explosion-proof valve 4 when the explosion-proof valve 4 is opened, thereby ensuring the normal opening of the explosion-proof valve 4.

[0060] In one embodiment, the support structure 3 includes a long strip structure, the long side of the support structure 3 is arranged along the length direction of the cover plate 1, and the total length of the support structure 3 is greater than the length of the explosion-proof valve 4; or, the long side of the support structure 3 is arranged along the width direction of the cover plate 1, and the total length of the support structure 3 is greater than the width of the explosion-proof valve 4.

[0061] This arrangement can ensure that the support structure 3 plays a supporting role while preventing the support structure 3 from being pushed out from the explosion-proof valve 4 under the action of airflow when the explosion-proof valve 4 is opened, thereby ensuring effective support of the support structure 3. As shown in the accompanying drawings, the long side of the support structure 3 is arranged along the width direction of the cover plate 1, so that the battery 10 plays a supporting role for the electrode group 102 when thermal runaway occurs, preventing the explosion-proof valve 4 from being blocked, and reducing the exhaust area occupied by the support structure 3 to ensure the exhaust effect.

[0062] In one embodiment, the lower plastic 2 includes a separate positive electrode lower plastic 23 and a negative electrode lower plastic 24, one end of the positive electrode lower plastic 23 is provided with a first recessed section, one end of the negative electrode lower plastic 24 is provided with a second recessed section, the positive electrode lower plastic 23 and the negative electrode lower plastic 24 are respectively connected to the cover plate 1, the vent 22 is provided in the first recessed section and / or the second recessed section, and the first recessed section and the second recessed section are spliced ​​to form a groove 21.

[0063] Specifically, the positive pole and the negative pole are arranged on the cover plate 1 at intervals, the positive lower plastic 23 is arranged corresponding to the positive pole, and the negative lower plastic 24 is arranged corresponding to the negative pole. The positive lower plastic 23 and the negative lower plastic 24 are arranged separately, which is convenient for processing and connected to the cover plate 1 respectively, which is convenient for assembly.

[0064] In one embodiment, the connecting section 311 and the lower plastic 2 are fixedly connected by a first connecting structure; the first connecting structure includes connecting holes 51 and connecting columns 52 that cooperate with each other, and the connecting section 311 of the bracket 31 and the lower plastic 2, one of which is provided with a connecting hole 51, and the other of which is provided with a connecting column 52, and the connecting column 52 and the connecting hole 51 are fixedly connected by hot melting after being plugged in.

[0065] In one embodiment, the connection section 311 and the lower plastic 2 are fixedly connected by a second connection structure, and the second connection structure includes a clamping hole 61 and a clamping column 62 that cooperate with each other. One of the connection section 311 of the bracket 31 and the lower plastic 2 is provided with a clamping hole 61, and the other is provided with a clamping column 62. The clamping column 62 is provided with a clamping convex rib 621. The clamping column 62 is plugged into the clamping hole 61 and is fixed by the clamping convex rib 621. Specifically, the clamping convex rib 621 and the clamping hole 61 are interference fit, and the interference amount of the radial dimensions of the two is not less than 0.2 mm, so that the bracket 31 and the lower plastic 2 can be firmly connected to prevent the bracket 31 from loosening.

[0066] In one embodiment, the connection section 311 and the lower plastic 2 are fixedly connected by a third connection structure, which includes a threaded hole 71 provided on the lower plastic 2, a through hole 72 provided on the connection section 311 of the bracket 31, and a fastener 73 matched with the threaded hole 71. The fastener 73 passes through the through hole 72 of the connection section 311 and is threadedly connected with the threaded hole 71 of the lower plastic 2. Specifically, the fastener 73 includes a screw. The material of the screw needs to be resistant to electrolyte, including stainless steel, aluminum or copper.

[0067] When threaded connection is adopted, specifically, a mounting column is protruded from the lower plastic 2, and the threaded hole 71 is provided on the mounting column.

[0068] The above three specific connection methods are used to fix the bracket 31 to the lower plastic 2 by hot melting, clamping, and screw connection to ensure the support function of the bracket 31 and keep the exhaust passage of the explosion-proof valve 4 able to exhaust and release pressure normally. Of course, other methods can also be used to fix the bracket 31 to the lower plastic 2, depending on the specific situation.

[0069] In one embodiment, the support section 312 of the bracket 31 is provided with two, and is respectively provided at the two ends of the connecting section 311. The support section 312 and the connecting section 311 are arranged vertically. The two support sections 312 are respectively abutted against the inner wall of the pressure relief chamber to limit the position, that is, the two support sections 312 are respectively abutted against the side wall of the groove 21 of the lower plastic 2. In this way, only one fixing point is required between the connecting section 311 and the lower plastic 2 to form a fixed positioning. Of course, in order to enhance the fixing effect, additional fixing points can be added as needed. The embodiment of the accompanying drawings adopts two fixing points.

[0070] Specifically, the support structure 3 is made of high temperature resistant and electrolyte resistant materials, including metal, ceramic and rubber.

[0071] According to an embodiment of the present invention, on the other hand, a battery 10 is provided, comprising a housing 101 and a cover assembly 103 as described in any one of the above technical solutions. The housing 101 has a receiving cavity and an open end; the cover assembly 103 is arranged at the open end of the housing 101.

[0072] Since the battery 10 includes the cover plate assembly 103 and has the same effect as the cover plate assembly 103 , it will not be described in detail here.

[0073] Specifically, the shell 101 has a receiving cavity, and the battery 10 further includes an electrode group 102 . The electrode group 102 is disposed in the receiving cavity of the shell 101 . The cover plate 1 and the shell 101 are welded and sealed to encapsulate the electrode group 102 in the shell 101 .

[0074] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, wherein an explosion-proof valve is provided on the cover plate; A lower plastic, wherein the lower plastic is connected to the cover plate, a pressure relief chamber is provided between the lower plastic and the cover plate, and the pressure relief chamber is communicated with the explosion-proof valve; A supporting structure is disposed in the pressure relief cavity and fixedly connected to the lower plastic.

2. The cover assembly according to claim 1, characterized in that: The lower plastic is provided with a groove, the groove is arranged corresponding to the explosion-proof valve, the bottom of the groove is provided with a vent hole, and the pressure relief chamber is formed between the groove and the cover plate; the supporting structure is connected to the bottom of the groove.

3. The cover assembly according to claim 1 or 2, characterized in that: The support structure comprises a bracket, and the bracket comprises a connecting section and at least one supporting section protruding in a direction away from the lower plastic, and the connecting section is fixedly connected to the lower plastic.

4. The cover assembly according to claim 3, characterized in that: The height of the upper surface of the supporting section of the bracket protruding from the upper surface of the connecting section is not less than 3 mm.

5. The cover assembly according to claim 3, characterized in that: A gap of not less than 0.2 mm is left between the upper surface of the support section and the cover plate.

6. The cover assembly according to claim 1 or 2, characterized in that: Projected along a direction perpendicular to the cover plate, the support structure and the explosion-proof valve do not completely overlap.

7. The cover assembly according to claim 6, characterized in that: The support structure comprises a long strip structure, the long side of the support structure is arranged along the length direction of the cover plate, and the total length of the support structure is greater than the length of the explosion-proof valve; or, the long side of the support structure is arranged along the width direction of the cover plate, and the total length of the support structure is greater than the width of the explosion-proof valve.

8. The cover assembly according to claim 2, characterized in that: The lower plastic includes a separate positive electrode lower plastic and a negative electrode lower plastic, one end of the positive electrode lower plastic is provided with a first recessed section, one end of the negative electrode lower plastic is provided with a second recessed section, the positive electrode lower plastic and the negative electrode lower plastic are respectively connected to the cover plate, the vent is provided in the first recessed section and / or the second recessed section, and the first recessed section and the second recessed section are spliced ​​to form the groove.

9. The cover assembly according to claim 3, characterized in that: The connecting section and the lower plastic are fixedly connected by a first connecting structure; the first connecting structure comprises a connecting hole and a connecting column that cooperate with each other, one of the connecting section of the bracket and the lower plastic is provided with the connecting hole, and the other is provided with the connecting column, and the connecting column and the connecting hole are fixedly connected by hot melting after being plugged in; Or, the connecting section and the lower plastic are fixedly connected by a second connecting structure, the second connecting structure comprises a clamping hole and a clamping column that cooperate with each other, one of the connecting section of the bracket and the lower plastic is provided with the clamping hole, and the other is provided with the clamping column, the clamping column is provided with a clamping convex rib, the clamping column is plugged into the clamping hole, and is fixed by the clamping convex rib; Alternatively, the connecting section and the lower plastic are fixedly connected via a third connecting structure, wherein the third connecting structure comprises a threaded hole provided on the lower plastic, a through hole provided on the connecting section of the bracket, and a fastener cooperating with the threaded hole, wherein the fastener passes through the through hole of the connecting section and is threadedly connected with the threaded hole of the lower plastic.

10. A battery, characterized in that: include: A housing having a receiving cavity and an open end; The cover plate assembly according to any one of claims 1 to 9, wherein the cover plate assembly is arranged at the open end of the shell.

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