Cover plate and battery

Abstract

The invention belongs to the field of batteries, and particularly relates to a cover plate and a battery. The cover plate comprises a cover plate body, a first pole and a first plastic part, wherein the cover plate body is provided with a first anti-explosion valve; the cover plate body comprises a first plate body, and the two ends of the first plate body are connected with second plate bodies correspondingly. In the third direction, the height of the first plate body is different from that of the second plate body, and the first anti-explosion valve is arranged on the second plate body; a mounting hole is formed in the first plate body; the first pole is arranged on one side of the cover plate body, and at least part of the first pole penetrates through the mounting hole and is connected with the cover plate body; the first plastic part is arranged on one side of the cover plate body; the first plastic part is matched with the cover plate body, an abutting part is arranged on one side, far away from the cover plate body, of the first plastic part, and the abutting part abuts against a pole group in the battery shell. According to the invention, the pole group can be prevented from moving, so that the pole group can be stably mounted in the battery shell, and the comprehensive performance of the battery is improved.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, specifically relating to a cover plate and a battery. Background Technology

[0002] The battery cell and cover are among the core components of a battery, significantly impacting its safety performance. When the battery is shaken or vibrated, the electrode assembly inside the casing can shift, potentially tearing the tabs or damaging the electrode plates. Summary of the Invention

[0003] In view of this, the present invention aims to at least partially solve one of the technical problems in the related art. To this end, the present invention provides a cover plate and a battery that can effectively fix the electrode assembly within the battery casing, effectively prevent electrode movement, avoid damage to the tabs, and simultaneously ensure the cell capacity.

[0004] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0005] According to a first aspect of the present invention, a cover plate is provided, comprising:

[0006] The cover plate body is equipped with a first explosion-proof valve;

[0007] The cover plate body includes a first plate, and a second plate is connected to each end of the first plate; in the third direction, the height of the first plate and the height of the second plate are different, and the first explosion-proof valve is disposed on the second plate; the first plate is provided with mounting holes.

[0008] A first pole post is disposed on one side of the cover plate body, and the first pole post passes at least partially through the mounting hole and is connected to the cover plate body;

[0009] A first plastic component is disposed on one side of the cover plate body; the first plastic component is adapted to the cover plate body, and an abutment is provided on the side of the first plastic component away from the cover plate body, the abutment abutting against the electrode assembly inside the battery casing.

[0010] In some embodiments, the first plastic part includes a first plastic sheet; and second plastic sheets respectively disposed at both ends of the first plastic sheet;

[0011] The first plastic sheet is disposed on the first plate body, the second plastic sheet is disposed on the second plate body, and the abutment members are respectively provided at both ends of the first plastic sheet.

[0012] In some embodiments, the first plastic part includes a plastic part sheet and a plastic part protrusion;

[0013] The plastic part plate body is adapted to the cover plate body, and the plastic part plate body is in contact with the cover plate body;

[0014] In the second direction, the length of the plastic part convex portion is less than the length of the plastic part plate body;

[0015] In the first direction, the width of the plastic part convex portion is less than the width of the plastic part plate body, and at least part of the plastic part convex portion is inserted into the battery housing.

[0016] In some embodiments, in the second direction, the length of the second plate body is H1, the length of the explosion-proof valve is H2, and H1 and H2 satisfy: 4.5mm ≤ (H1 - H2) / 2 ≤ 8.5mm, and 7mm < H2 ≤ 16mm.

[0017] In some embodiments, a welding part is provided on the plastic part convex portion of the first plastic plate;

[0018] The welding part is provided on any one side edge of the plastic part convex portion, and the distance from one end of the welding part to the plastic part plate body is L2; <00000​​​​​​​​​​​​​​​​​​​​​​​​​

[0026] One end of the side plate is connected to the cover plate body;

[0027] In the second direction, a venting groove is provided on the opposite outer side of the side plate, and the venting groove is connected to the first explosion-proof valve.

[0028] In some of these embodiments, a light plate is also included;

[0029] The other end of the light plate and the side plate are connected, and the light plate is provided with a second pole post and a second explosion-proof valve;

[0030] When the battery experiences thermal runaway, the second explosion-proof valve and the venting slot become connected.

[0031] This invention provides a cover plate and a battery. The cover plate has at least one first explosion-proof valve on its body. The cover plate body includes a first plate, with second plates connected to both ends of the first plate. In a third direction, the heights of the first plate and the second plate are different. The first explosion-proof valve is located on the second plate. The first plate has mounting holes. A first terminal post is located on one side of the cover plate body, at least partially passing through the mounting holes and connecting to the cover plate body. A first plastic part is located on one side of the cover plate body. The first plastic part is adapted to the cover plate body, and an abutment is located on the side of the first plastic part away from the cover plate body, abutting against the electrode assembly inside the battery casing. The cover plate provided by this invention can effectively protect the electrode assembly and tabs, preventing the electrode assembly from shifting, causing tearing of the tabs and damage to the electrode assembly, allowing the electrode assembly to be securely installed inside the battery casing, thus improving the overall performance of the battery.

[0032] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0034] Figure 1 The diagram shown is a structural schematic of a cover plate provided by the present invention;

[0035] Figure 2 The diagram shown is a top view of a cover plate provided by the present invention.

[0036] Figure 3 The diagram shown is a cross-sectional view of a cover plate provided by the present invention. Figure 1 ;

[0037] Figure 4 The diagram shown is a schematic diagram of the bottom structure of a cover plate provided by the present invention;

[0038] Figure 5 The diagram shown is a cross-sectional view of a cover plate provided by the present invention. Figure 2 ;

[0039] Figure 6 The diagram shown is a structural schematic of a battery provided by the present invention. Figure 1 ;

[0040] Figure 7 The diagram shown is a structural schematic of a battery side plate provided by the present invention;

[0041] Figure 8 The diagram shown is a structural schematic of a battery provided by the present invention. Figure 2 .

[0042] Attached diagram structure description:

[0043] 100—Cover plate;

[0044] 110—Cover plate body; 111—First plate; 112—Second plate; 113—Connecting plate; 114—First explosion-proof valve;

[0045] 120 – Second plastic part; 140 – First pole post; 150 – Connecting block;

[0046] 130 – First plastic part; 131 – Abutting part; 132 – Welded part; 133 – First plastic sheet; 134 – Second plastic sheet; 135 – Plastic part body; 136 – Protrusion of plastic part;

[0047] 200 – Side plate; 210 – Vent groove; 300 – Plain plate; 310 – Second pole; 320 – Second explosion-proof valve.

[0048] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0049] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0050] The battery casing and cover protect the electrode assembly, which has tabs that connect to terminals on the cover, allowing the battery to charge and discharge. Since the tabs, electrode assembly, and terminals are typically welded together, and during normal use, the electrode assembly within the battery casing often shifts, causing issues such as tearing of the tabs.

[0051] In view of this, the present invention provides a cover plate with a central recess and an electrode post disposed in the recessed position to avoid damage to the electrode post; the cover plate is also provided with a first plastic part, which has a certain elasticity and can play an insulating role while also effectively stabilizing the electrode assembly, preventing the electrode assembly from shifting and the electrode assembly from bumping against the cover plate, thereby effectively protecting the battery from damage.

[0052] Some embodiments of the present invention provide a cover plate, including: a cover plate body 110, a first pole post 140, and a first plastic part 130; the cover plate body 110 is provided with a first explosion-proof valve 114; the cover plate body 110 includes a first plate 111, and a second plate 112 is respectively connected to both ends of the first plate 111; the height of the first plate 111 in a third direction is different from the height of the second plate 112, and the first explosion-proof valve 114 is disposed on the second plate 112; the first plate 111 is provided with a mounting hole; the first pole post 140 is disposed on one side of the cover plate body 110, and the first pole post 140 at least partially passes through the mounting hole and is connected to the cover plate body 110.

[0053] refer to Figure 1 The cover plate body 110 is configured with a structure that is concave in the middle and convex at both ends. That is, the cover plate body 110 includes at least one first plate 111 and multiple second plates 112. The left and right ends of each first plate 111 are connected to the second plate 112 by a fixed connection method such as welding or bonding, or a detachable connection method such as snap-fit ​​or riveting. The third direction is along the thickness direction of the cover plate or the cover plate body 110. Figure 1 In the z-axis direction, the height of the first plate 111 is less than the height of the second plate 112. Of course, the cover plate body 110 can also be configured with two or more second plates 112, with each first plate 111 having a second plate 112 connected to both ends, and the cover plate body 110 forming a "comb-like" structure.

[0054] Continue to refer to Figure 1In a preferred embodiment, the cover plate body 110 includes a first plate 111, with connecting plates 113 respectively connected to its left and right ends. The connecting plates 113 and the first plate 111 can be perpendicular or at an angle; this embodiment does not specifically limit this, and both are within the protection scope of the present invention. A second plate 112 is connected to the connecting plate 113. In a preferred embodiment, the second plate 112 and the first plate 111 can be arranged in parallel space. A first explosion-proof valve 114 is provided on the second plate 112. The number of first explosion-proof valves 114 can be one, two, or more. The first plate 111 is provided with mounting holes, and the number of mounting holes can also be one, two, or more.

[0055] The first terminal 140 is disposed on either side of the cover plate body 110. A portion of the first terminal 140 can pass through a mounting hole from one side of the cover plate body 110 to the other side of the cover plate body 110 and be detachably connected to the cover plate body 110. As will be understood by those skilled in the art, one end of the first terminal 140 can be connected to a tab, and the other end can be electrically connected to an external electrical device or charging device to realize the charging and discharging of the battery.

[0056] In some embodiments, the first plastic part 130 is disposed on one side of the cover plate body 110; the first plastic part 130 and the cover plate body 110 are adapted to each other, and an abutment 131 is provided on the side of the first plastic part 130 away from the cover plate body 110, and the abutment 131 abuts against the electrode assembly in the battery casing.

[0057] refer to Figure 2 The first plastic component 130 is disposed on one side of the cover plate body 110. In a preferred embodiment, the first plastic component 130 and the first pole post 140 can be disposed on the same side of the cover plate body 110. In order to enable the first plastic component 130 to perform its good insulation performance, the structure of the first plastic component 130 is adapted to the cover plate body 110, that is, the first plastic component 130 is also configured as a structure with a concave middle and convex ends.

[0058] Continue to refer to Figure 2 At least one abutment 131 is provided on the first plastic plate 133, and the abutment 131 is located on the side of the first plastic plate 133 away from the cover plate body 110. The abutment 131 is located inside the battery casing and abuts against the electrode assembly inside the battery casing. In this way, the first plastic plate 130 with a certain elasticity can be well fixed and stabilized, so that when the electrode assembly moves, the abutment 131 can stabilize the electrode assembly and protect the electrode assembly from damage. At the same time, it can also prevent the electrode assembly and the cover plate from colliding when the electrode assembly moves, which would cause damage to the electrode assembly and tearing of the electrode tabs.

[0059] The number of abutment members 131 can be set to one, two, three or more. In the preferred embodiment of this example, there can be two abutment members 131, which are located at both ends of the first plastic plate 133 respectively. This can better stabilize the electrode assembly, protect the safety of the battery cell, and thus make the battery have more stable performance and a longer service life.

[0060] This invention provides a cover plate and a battery. The cover plate has at least one first explosion-proof valve on its main body; two second plates are connected to both ends of the first plate of the cover plate main body; the heights of the first plate and the second plate are different in a third direction; the first explosion-proof valve is located on the second plate; the first plate has at least one mounting hole; the cover plate also includes a first terminal post and a first plastic component. The first terminal post is located on one side of the cover plate main body and at least partially passes through the mounting hole to connect with the cover plate main body; the first plastic component is also located on one side of the cover plate main body; the first plastic component is adapted to the cover plate main body, and an abutment is provided on the side of the first plastic component away from the cover plate main body, the abutment abutting against the electrode assembly inside the battery casing. The cover plate provided by this invention can effectively protect the electrode assembly and tabs, prevent the electrode assembly from shifting, causing tearing of the tabs and damage to the electrode assembly, and ensure that the electrode assembly is stably installed inside the battery casing, thereby improving the overall performance of the battery.

[0061] In some embodiments, the first plastic part 130 includes a first plastic plate 133 and a second plastic plate 134 respectively disposed at both ends of the first plastic plate 133; the first plastic plate 133 is disposed on the first plate body 111, the second plastic plate 134 is disposed on the second plate body 112, and the two ends of the first plastic plate 133 are respectively provided with abutment members 131.

[0062] refer to Figure 1 and Figure 2 In order to adapt to the cover body 110 with its concave-convex structure, the first plastic part 130 is also configured with a concave-convex structure. The first plastic plate 133 corresponds to the first plate body 111, and the second plastic plate 134 corresponds to the second plate body 112. The heights of the first plastic plate 133 and the second plastic plate 134 are different. In this way, one side surface of the first plastic part 130 can fit tightly with the cover body 110, thereby achieving the sealing and insulation function of the first plastic part 130. Abutment members 131 are respectively provided on the left and right ends of the first plastic plate 133, which can abut against the electrode assembly and stabilize the electrode assembly inside the battery casing.

[0063] In some embodiments, the first plastic part 130 includes a plastic part plate body 135 and a plastic part protrusion 136; the plastic part plate body 135 is adapted to the cover body 110 and the plastic part plate body 135 contacts the cover body 110; in the second direction, the length of the plastic part protrusion 136 is less than the length of the plastic part plate body 135; in the first direction, the width of the plastic part protrusion 136 is less than the width of the plastic part plate body 135, and the plastic part protrusion 136 is at least partially inserted into the battery case.

[0064] Reference Figure 1 and Figure 2 , the second direction is along the length direction of the cover, that is, the y-axis direction as shown in Figure 1 ; the first direction is along the width direction of the cover, that is, the x-axis direction as shown in Figure 1 ; the first plastic part 130 further includes a plastic part plate body 135 and a plastic part protrusion 136. The size of the plastic part plate body 135 is adapted to the cover body 110. A plastic part protrusion 136 is provided on one surface of the plastic part plate body 135 away from the cover body 110. The length and width of the plastic part protrusion 136 are both less than those of the plastic part plate body 135. When the first plastic part 130 is installed on the cell case, the plastic part protrusion 136 can be inserted into the cell case, and a part of the plastic part plate body 135 is clamped between the cover body 110 and the cell case.

[0065] In a preferred embodiment, at least two abutting members 131 are provided on the plastic part protrusion 136 of the first plastic plate body 133. The plastic part plate body 135 and the plastic part protrusion 136 form a shape similar to an inverted "L", which can well play the roles of sealing and insulation. At the same time, the abutting members 131 located on the plastic part protrusion 136 also play the role of stabilizing the electrode group.

[0066] In some embodiments, in the second direction, the length of the second plate body 112 is H1, and the length of the first explosion-proof valve 114 is H2. H1 and H2 satisfy: 4.5mm ≤ (H1 - H2) / 2 ≤ 8.5mm, and 7mm < H2 ≤ 16mm.

[0067] Reference Figure 3 and Figure 5The second direction is along the length of the cover plate. The length of the second plate 112 is set as H1, and the length of the first explosion-proof valve 114 is set as H2. H1 and H2 satisfy: 4.5mm≤(H1-H2) / 2≤8.5mm, that is, the value of (H1-H2) / 2 can be any value of 4.5mm, 5mm, 6mm, 7mm, 8mm or 8.5mm or any value between any two, and H2 can be any value of 8mm, 9mm, 10mm, 11mm, 13mm, 15mm or 16mm or any value between any two. The first explosion-proof valve 114 has the function of protecting the battery and preventing the battery from exploding when it thermally runs away. By limiting the length of the first explosion-proof valve 114 and the relationship between the length of the first explosion-proof valve 114 and the length of the second plate 112, the battery can have better thermal runaway safety performance.

[0068] In some embodiments, a welding member 132 is provided on the plastic part protrusion 136 of the first plastic plate 133; the welding member 132 is provided on any edge of the plastic part protrusion 136, and the distance from one end of the welding member 132 to the plastic part plate is L2; ​​in a first direction, the length of the plastic part protrusion 136 is L1; in a second direction, the length of the end of the abutment member 131 near the electrode group is W1, L1, L2 and W1 satisfy: 49mm 2 ≤L1*W1≤110mm 2 , 3mm≤L2≤5mm.

[0069] refer to Figure 3 and Figure 4 At least one welding member 132 is provided on the plastic part protrusion 136 of the first plastic plate 133. In a preferred embodiment, two welding members 132 can be provided, and they are respectively provided on the front and rear edges of the plastic part protrusion 136. The distance from one end of the welding member 132 to the plastic part plate is L2. In the first direction, the length of the plastic part protrusion 136 is L1. In the second direction, the length of the end of the abutment member 131 near the electrode group is W1, where L1*W1 can be 49mm. 2 50mm 2 60mm 2 70mm 2 80mm 2 90mm 2 100mm 2 Or 110mm 2 L1 can be any value in L1, L2, or W1, or any value between any two of them; L2 can be any value in L1, L2, or W1, or any value between any two of them; by understanding the relationship and value range of L1, L2, and W1, we can ensure that the size of the heat-melting position of the insulating film is appropriate, improve the heat-melting yield, thereby effectively avoiding damage to the insulating film and improving the overall performance of the battery.

[0070] In some embodiments, the first pole post 140 includes a post body and a plate portion, the post body at least partially passing through the first plastic plate 133 and the mounting hole; a mounting groove is provided on the plastic protrusion 136 of the first plastic plate 133, and the plate portion is fitted into the mounting groove when the post body passes through the first plastic plate 133.

[0071] refer to Figure 1 The post in the first electrode 140 can pass through the mounting hole from one side of the cover plate body 110 to the other side, while the plate part is tightly attached to one side surface of the cover plate body 110. The plastic part protrusion 136 of the first plastic part is also provided with a mounting groove. When the post passes through the first plastic part 130, the plate part can be fitted into the mounting groove. In this way, the first plastic part 130 can stabilize the first electrode 140, prevent the first electrode 140 from rotating, and prevent damage to the electrode tab or external connection device, so that the electrode assembly can be more securely installed in the cell housing.

[0072] In some embodiments, the system further includes a second plastic component 120 and a connecting block 150; both the second plastic component 120 and the connecting block 150 are disposed on the other side of the cover plate body 110, the connecting block 150 is disposed on the second plastic component 120, and the connecting block 150 is detachably connected to the first pole post 140 passing through the cover plate body 110.

[0073] refer to Figure 1 and Figure 2 On the other side of the cover plate body 110, a second plastic part 120 and a connecting block 150 are respectively provided. The connecting block 150 is sleeved on the second plastic part 120. The second plastic part 120 and one side surface of the cover plate body 110 are tightly fitted. The post of the first pole post 140 can pass through the second plastic part 120 and the connecting block 150 for detachable connection. The connecting block 150 can be electrically connected to an external charging and discharging device.

[0074] In some embodiments of the present invention, a battery is also provided, comprising: the cover plate of any of the above embodiments of the present invention.

[0075] refer to Figure 6 The battery includes the cover plate as described in any of the above embodiments; in some preferred embodiments, the battery also includes a battery casing, and one end of the battery casing connected to the cover plate is configured to fit the concave-convex structure of the cover plate. Those skilled in the art will understand that the battery cell also includes components known in the art such as electrode groups and tabs, which will not be described in detail here.

[0076] In some embodiments, the battery further includes a side plate 200; one end of the side plate 200 is connected to the cover plate body 110; in a second direction, a venting groove 210 is provided on the opposite outer side of the side plate 200, and the venting groove 210 is connected to the first explosion-proof valve 114.

[0077] refer to Figure 7 The battery has at least one side plate 200, and a venting groove 210 is provided on the side plate 200. One end of the side plate 200 is connected to the cover plate. In a preferred embodiment, the number of side plates 200 is consistent with the number of first explosion-proof valves 114. For example, the battery cell has two side plates 200. In the second direction, that is, along the length of the cover plate, the two side plates 200 are provided with venting grooves 210 on their opposite outer sides. The venting grooves 210 are respectively connected to the corresponding first explosion-proof valves 114. When the battery cell experiences thermal runaway, the gas inside the battery cell flows along the venting groove 210 to the first explosion-proof valve 114, thereby effectively preventing the safety risks caused by thermal runaway.

[0078] In some embodiments, the battery further includes a light plate 300; the other end of the light plate 300 is connected to the side plate 200, and the light plate 300 is provided with a second pole post 310 and a second explosion-proof valve 320; when the battery thermally runs away, the second explosion-proof valve 320 is connected to the venting groove 210.

[0079] refer to Figure 6 and Figure 8 The battery also includes a light plate 300, which is positioned opposite to the cover plate. One end of the side plate 200 is connected to the cover plate, and the other end is connected to the light plate 300. The light plate 300 is equipped with a second terminal 310 and a second explosion-proof valve 320. The first terminal 140 and the second terminal 310 can serve as the positive and negative terminals of the battery cell, respectively. For example, the first terminal 140 can be the positive terminal and the second terminal 310 the negative terminal, or vice versa, or both terminals can be positive, or both terminals can be negative. When the battery experiences thermal runaway, the second explosion-proof valve 320 is connected to the venting groove 210. Gas generated during thermal runaway can flow along the venting groove 210 to the second explosion-proof valve 320 for discharge, thus achieving venting and pressure relief.

[0080] The battery also includes electrodes, a separator, and an electrolyte. In this embodiment, the battery can be any one of a blade battery, a button battery, or a lithium-ion battery.

[0081] The present application will be described in detail below with reference to the accompanying drawings and examples. However, the implementation and protection of the present invention are not limited thereto. The following embodiments are only some embodiments of the present application and are not intended to limit the present application.

[0082] Example 1

[0083] The only difference in Example 1 is that H1 = 25.00 mm, H2 = 8.00 mm, L1 = 11.00 mm, L2 = 3.00 mm, W1 = 4.50 mm, W2 = 5.00 mm, (H1-H2) / 2 = 8.50 mm, and L1*W1 = 49.50 mm. 2 .

[0084] Example 2

[0085] The only difference in Example 2 is that H1 = 25.00 mm, H2 = 9.00 mm, L1 = 11.00 mm, L2 = 3.50 mm, W1 = 5.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 8.00 mm, and L1*W1 = 55.00 mm. 2 .

[0086] Example 3

[0087] The only difference in Example 3 is that H1 = 25.00 mm, H2 = 10.00 mm, L1 = 11.00 mm, L2 = 3.50 mm, W1 = 5.50 mm, W2 = 5.00 mm, (H1-H2) / 2 = 7.50 mm, and L1*W1 = 60.50 mm. 2 .

[0088] Example 4

[0089] The only difference in Example 4 is that H1 = 25.00 mm, H2 = 12.00 mm, L1 = 11.00 mm, L2 = 4.00 mm, W1 = 7.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 6.50 mm, and L1*W1 = 77 mm. 2 .

[0090] Example 5

[0091] The only difference in Example 5 is that H1 = 25.00 mm, H2 = 14.00 mm, L1 = 11.00 mm, L2 = 4.50 mm, W1 = 9.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 5.50 mm, and L1*W1 = 99.00 mm. 2 .

[0092] Example 6

[0093] The only difference in Example 6 is that H1 = 25.00 mm, H2 = 16.00 mm, L1 = 11.00 mm, L2 = 5.00 mm, W1 = 10.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 8.50 mm, and L1*W1 = 49.50 mm. 2 .

[0094] Comparative Example 1

[0095] The only difference in Comparative Example 1 is that H1 = 25.00 mm, H2 = 7.00 mm, L1 = 11.00 mm, L2 = 4.00 mm, W1 = 7.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 9.00 mm, and L1*W1 = 77.00 mm. 2 .

[0096] Comparative Example 2

[0097] The only difference in Comparative Example 2 is that H1 = 25.00 mm, H2 = 18.00 mm, L1 = 11.00 mm, L2 = 4.00 mm, W1 = 7.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 3.50 mm, and L1*W1 = 77.00 mm. 2 .

[0098] Comparative Example 3

[0099] The only difference in Comparative Example 3 is that H1 = 25.00 mm, H2 = 12.00 mm, L1 = 11.00 mm, L2 = 4.00 mm, W1 = 4.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 6.50 mm, and L1*W1 = 44.00 mm. 2 .

[0100] Comparative Example 4

[0101] The only difference in Comparative Example 4 is that H1 = 25.00 mm, H2 = 12.00 mm, L1 = 11.00 mm, L2 = 4.00 mm, W1 = 11.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 6.50 mm, and L1*W1 = 121.00 mm. 2 .

[0102] Comparative Example 5

[0103] The only differences in Comparative Example 5 are: H1 = 25.00 mm, H2 = 12.00 mm, L1 = 11.00 mm, L2 = 2.80 mm, W1 = 7.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 6.50 mm, and L1*W1 = 77.00 mm. 2 .

[0104] Comparative Example 6

[0105] The only differences in Scale 6 are: H1 = 25.00 mm, H2 = 17.00 mm, L1 = 11.00 mm, L2 = 4.00 mm, W1 = 7.00 mm, W2 = 5.00 mm, (H1-H2) / 2 = 4.00 mm, and L1*W1 = 77.00 mm. 2 .

[0106] Performance testing:

[0107] The batteries prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were tested. The casing wall thickness was 0.35 mm, the inner insulating film was made of PP (polypropylene) with a wall thickness of 0.1 mm, the second plastic part was made of PPS (polyphenylene sulfide), and the first plastic part was made of PP. The test results are shown in Table 1.

[0108] Table 1. Test Results:

[0109]

[0110]

[0111]

[0112] As shown in Table 1, compared with Comparative Examples 1-6, the cell yield of batteries in Examples 1-6 is >98%; the appearance and strength of the cover plate meet the technical requirements during the molding process. The electrode assembly insertion, insulating film hot melting, and fixing all meet the technical requirements, and no electrode assembly damage or misalignment occurs. The cell thermal runaway performance meets the requirements. In contrast, the cell yield of Comparative Examples 1-6 is less than 98%; and problems arise during the molding process, such as the small size of the first explosion-proof valve making it difficult to stamp, resulting in unstable dimensions and burst values, a cell yield of less than 96%, and a large contact area of ​​the first plastic part occupying the electrode space, leading to reduced current carrying capacity of the cell electrode and cell temperature rise exceeding 55°C, thus affecting cell performance.

[0113] The parts of this invention not described in detail are techniques known to those skilled in the art.

[0114] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0115] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "described," and "the" used in the embodiments of the invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0116] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.

[0117] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0118] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0119] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A cover plate, characterized in that, include: The cover plate body is equipped with a first explosion-proof valve; The cover plate body includes a first plate, and a second plate is connected to each end of the first plate; in the third direction, the height of the first plate and the height of the second plate are different, and the first explosion-proof valve is disposed on the second plate; the first plate is provided with mounting holes. A first pole post is disposed on one side of the cover plate body, and the first pole post passes at least partially through the mounting hole and is connected to the cover plate body; A first plastic component is disposed on one side of the cover plate body; the first plastic component is adapted to the cover plate body, and an abutment is provided on the side of the first plastic component away from the cover plate body, the abutment abutting against the electrode assembly inside the battery casing.

2. The cover plate according to claim 1, characterized in that, The first plastic part includes a first plastic sheet; and second plastic sheets respectively disposed at both ends of the first plastic sheet; The first plastic sheet is disposed on the first plate body, the second plastic sheet is disposed on the second plate body, and the abutment members are respectively provided at both ends of the first plastic sheet.

3. The cover plate according to claim 2, characterized in that, The first plastic part includes a plastic part sheet and a plastic part protrusion; The plastic part plate and the cover plate body are adapted to each other, and the plastic part plate and the cover plate body are in contact; In the second direction, the length of the protrusion of the plastic part is less than the length of the plastic part sheet; In a first direction, the width of the plastic protrusion is smaller than the width of the plastic plate, and the plastic protrusion is at least partially inserted into the battery housing.

4. The cover plate according to claim 2, characterized in that, In the second direction, the length of the second plate is H1, and the length of the first explosion-proof valve is H2, wherein H1 and H2 satisfy: 4.5mm ≤ (H1-H2) / 2 ≤ 8.5mm, and 7mm <H2≤16mm。 5. The cover plate according to claim 3, characterized in that, The first plastic sheet has a welded part on the protruding part of the plastic component; The welding member is disposed on any side edge of the protrusion of the plastic part, and the distance from one end of the welding member to the plastic part plate is L2; In the first direction, the width of the protruding portion of the plastic part is L1; in the second direction, the length of the end of the abutment member near the pole assembly is W1, and L1, L2, and W1 satisfy: 49mm 2 ≤L1*W1≤110mm 2 , 3mm≤L2≤5mm.

6. The cover plate according to claim 3, characterized in that, The first pole post includes a column body and a plate portion, wherein the column body at least partially passes through the first plastic plate and the mounting hole; The first plastic sheet has a mounting groove on the protruding part of the plastic component, and when the column passes through the first plastic sheet, the plate part is fitted into the mounting groove.

7. The cover plate according to claim 1, characterized in that, It also includes a second plastic part and a connecting block; The second plastic part and the connecting block are both located on the other side of the cover plate body. The connecting block is located on the second plastic part and is detachably connected to the first pole passing through the cover plate body.

8. A battery, characterized in that, include: The cover plate according to any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that, It also includes a side plate; one end of the side plate is connected to the cover plate body; In the second direction, a venting groove is provided on the opposite outer side of the side plate, and the venting groove is connected to the first explosion-proof valve.

10. The battery according to claim 9, characterized in that, It also includes bare plates; The other end of the light plate and the side plate are connected, and the light plate is provided with a second pole post and a second explosion-proof valve; When the battery experiences thermal runaway, the second explosion-proof valve and the venting slot become connected.

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