Cover plate assembly and battery cell

Abstract

The application relates to a cover plate assembly and a battery cell, and relates to the technical field of batteries.The cover plate assembly comprises a cover plate and an explosion-proof valve.The cover plate is provided with an explosion-proof hole penetrating in a first direction.The cover plate is provided with a first exhaust groove on one side in the first direction, and one end of the first exhaust groove is communicated with the explosion-proof hole; wherein the first direction represents the thickness direction of the cover plate; and the explosion-proof valve is arranged in the explosion-proof hole.The cover plate assembly and the battery cell can timely discharge gas when a blockage problem occurs in the area between the pole group and the explosion-proof valve, and the exhaust efficiency is improved.

Description

Technical Field

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

[0002] Currently, battery cell covers are typically equipped with explosion-proof valves. When abnormal conditions occur in the electrode assembly inside the cell (such as short circuits, overcharges, or over-discharges), the internal gas pressure increases. When the pressure exceeds a certain threshold, the explosion-proof valve opens to promptly release the internal gas, preventing explosions or combustion due to excessive internal pressure. However, in related technologies, after the explosion-proof valve opens, blockage can easily occur in the area between the electrode assembly and the valve, leading to reduced venting efficiency. This can prevent the internal gas pressure from decreasing in a timely manner, potentially causing safety issues. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a cover plate assembly and a battery cell that can promptly release gas and improve exhaust efficiency when blockage occurs in the area between the electrode group and the explosion-proof valve.

[0004] In a first aspect, a cover plate assembly is provided, comprising:

[0005] A cover plate is provided with an explosion-proof hole that extends through a first direction. The cover plate is provided with a first vent groove on one side along the first direction, and one end of the first vent groove is connected to the explosion-proof hole. The first direction represents the thickness direction of the cover plate.

[0006] An explosion-proof valve is installed inside the explosion-proof hole.

[0007] According to a first aspect of this application, the cover plate is further provided with a second vent groove on one side along the first direction. The second vent groove and the first vent groove are located on the same side of the cover plate. The second vent groove is arranged around the explosion-proof hole and connects the explosion-proof hole and the first vent groove.

[0008] According to a first aspect of this application, a first stepped surface is formed between the second exhaust groove and the explosion-proof hole, and the width of the first stepped surface along the centripetal direction of the second exhaust groove is A, in mm, wherein A satisfies: 0.5mm≤A≤3mm; wherein, the centripetal direction of the second exhaust groove represents the direction in which the inner wall of the second exhaust groove is perpendicular to the central axis of the second exhaust groove.

[0009] According to a first aspect of this application, the depth of the first exhaust groove along the first direction is D, in mm, and the depth of the second exhaust groove along the first direction is C, in mm, wherein D and C satisfy: 0.2 mm ≤ D ≤ C.

[0010] According to a first aspect of this application, the distance between the edge of the second exhaust groove and the edge of the cover plate along a second direction is F, in mm, wherein F satisfies: 1.5mm≤F≤30mm; wherein the second direction represents the width direction of the cover plate.

[0011] According to a first aspect of this application, the cover plate includes a first side and a second side distributed along the first direction. The second side is provided with a first exhaust groove and a second exhaust groove. A first step surface is formed between the second exhaust groove and the explosion-proof hole. The distance between the first step surface and the first side along the first direction is E, in mm, and E satisfies: E≥0.7mm.

[0012] According to a first aspect of this application, the depth of the second exhaust groove along the first direction is C, in mm, and the thickness of the cover plate along the first direction is H, in mm, wherein C and H satisfy: 0.2mm≤C=HE.

[0013] According to a first aspect of this application, a boss is provided on the first side, the boss and the second exhaust groove are disposed opposite to each other along the first direction, one end of the explosion-proof hole passes through the boss, and the other end of the explosion-proof hole is connected to the second exhaust groove.

[0014] According to a first aspect of this application, the second exhaust groove is connected to different first exhaust grooves on opposite sides along a third direction; wherein the third direction represents the length direction of the cover plate.

[0015] Secondly, a battery cell is also provided, including:

[0016] The casing has an opening;

[0017] The pole assembly is located within the housing;

[0018] As described in the previous embodiment, the cover plate assembly is located at one end of the electrode assembly, and the cover plate is connected to the housing to close the opening.

[0019] The cover plate assembly and battery cell provided in this application embodiment have a first exhaust groove on one side of the cover plate along a first direction, and the first exhaust groove is connected to the explosion-proof hole. In this way, when a blockage occurs in the area between the electrode group and the explosion-proof valve, the gas accumulated in the area between the electrode group and the explosion-proof valve can diffuse to the first exhaust groove, then enter the explosion-proof hole along the first exhaust groove, and then be discharged from the housing through the explosion-proof hole. That is, when a blockage occurs in the area between the electrode group and the explosion-proof valve, the gas can be discharged in time to avoid safety problems caused by excessive gas pressure. Attached Figure Description

[0020] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0021] Figure 1 This is a schematic diagram of the structure of a cover plate assembly provided for an exemplary embodiment of this application.

[0022] Figure 2 An exploded view of a cover plate assembly provided for an exemplary embodiment of this application.

[0023] Figure 3 A cross-sectional view of a cover plate assembly provided for an exemplary embodiment of this application.

[0024] Figure 4 for Figure 3 Enlarged diagram of point M in the diagram.

[0025] Figure 5 This is a schematic diagram of the structure of a cover plate provided for an exemplary embodiment of this application.

[0026] Reference numerals: 100-Cover plate assembly; 110-Cover plate; 111-Explosion-proof hole; 112-First vent groove; 113-Second vent groove; 114-First step surface; 115-First side; 116-Second side; 117-Boss; 120-Explosion-proof valve; 130-Lower plastic. Detailed Implementation

[0027] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0028] Figure 1 This is a schematic diagram of the structure of a cover plate assembly provided for an exemplary embodiment of this application. Figure 2 An exploded view of a cover plate assembly provided for an exemplary embodiment of this application. Figure 1 and Figure 2 As shown, the battery cell provided in this embodiment may include a housing, an electrode assembly, and a cover assembly 100. The housing has an opening, through which the electrode assembly can be fitted into the housing. The cover assembly 100 is disposed at one end of the electrode assembly and can be connected to the housing. The cover assembly 100 can close the opening. The cover assembly 100 and the housing can prevent foreign objects from entering the electrode assembly, thus protecting the electrode assembly.

[0029] like Figure 1and Figure 2 As shown, the cover plate assembly 100 provided in this application embodiment may include a cover plate 110, which can be used to directly connect to the aforementioned housing to close the opening and prevent foreign objects from entering the electrode assembly through the opening.

[0030] like Figure 1 and Figure 2 As shown, the cover plate assembly 100 may further include an explosion-proof valve 120, and the cover plate 110 is provided with an explosion-proof hole 111, which is along a first direction (which can be understood as the thickness direction of the cover plate 110, see reference for details). Figure 2 The explosion-proof valve 120 is located inside the explosion-proof hole 111, with the Z-axis direction penetrating through the cover plate 110. In practical applications, when an abnormal situation occurs in the electrode assembly (such as overcharging, over-discharging, short circuit, etc.), a large amount of gas is generated inside the housing, increasing the gas pressure. When the gas pressure increases to the pressure threshold, the explosion-proof valve 120 can open to promptly release the gas inside the housing, reducing the gas pressure and preventing safety accidents such as combustion and explosion caused by excessive internal gas pressure.

[0031] Figure 3 A cross-sectional view of a cover plate assembly provided for an exemplary embodiment of this application. Figure 4 for Figure 3 An enlarged diagram of point M in the image. (See image for reference.) Figures 2 to 4 As shown, the cover plate 110 is along the first direction (see reference). Figures 2 to 4 A first exhaust groove 112 is provided on one side of the Z-axis direction, and one end of the first exhaust groove 112 is connected to the explosion-proof hole 111.

[0032] It should be noted that after the cover plate 110 is assembled on the housing, the side of the cover plate 110 with the first exhaust groove 112 faces the electrode group, that is, the first exhaust groove 112 is set facing the electrode group.

[0033] It should be noted that when the internal pressure of the housing reaches the pressure threshold, the explosion-proof valve 120 opens, and the gas is discharged from the housing through the explosion-proof port 111. In related technologies, after the explosion-proof valve 120 opens, blockage can easily occur in the area between the electrode assembly and the explosion-proof valve 120, reducing exhaust efficiency and preventing the gas inside the housing from escaping. This can lead to insufficient pressure reduction and potential safety issues.

[0034] In this embodiment, when a blockage occurs in the area between the electrode assembly and the explosion-proof valve 120, the gas accumulated in this area can diffuse to the first exhaust channel 112, then enter the explosion-proof hole 111 along the first exhaust channel 112, and finally exit the housing through the explosion-proof hole 111. In other words, this embodiment utilizes the first exhaust channel 112 to promptly release gas when a blockage occurs in the area between the electrode assembly and the explosion-proof valve 120, preventing safety issues caused by excessive gas pressure.

[0035] In addition, it should be understood that when the explosion-proof valve 120 is opened, under normal circumstances (when there is no blockage in the area between the electrode group and the explosion-proof valve 120), the gas can not only enter the explosion-proof hole 111 through the explosion-proof valve 120, but also enter the explosion-proof hole 111 through the first exhaust groove 112. In this way, the exhaust efficiency can be effectively improved, and the gas pressure inside the shell can be reduced more quickly.

[0036] In one embodiment, the number of first exhaust slots 112 can be one, two, or more.

[0037] In one embodiment, there are multiple first exhaust grooves 112, which are distributed circumferentially along the explosion-proof hole 111. This can further improve exhaust efficiency and alleviate the problem that gas tends to accumulate in the area between the electrode group and the explosion-proof valve 120.

[0038] In one embodiment, the first exhaust groove 112 can be a strip groove, an arc groove, or the like.

[0039] like Figures 2 to 4 As shown, a second exhaust groove 113 is provided on one side of the cover plate 110 along the first direction. The second exhaust groove 113 and the first exhaust groove 112 are located on the same side of the cover plate 110 (that is, when the cover plate 110 is connected to the housing, both the first exhaust groove 112 and the second exhaust groove 113 are located on the side of the cover plate 110 near the electrode assembly). The second exhaust groove 113 is arranged around the explosion-proof hole 111 and connects the explosion-proof hole 111 and the first exhaust groove 112. In practical applications, when gas diffuses into the first exhaust groove 112, the gas can flow into the explosion-proof hole 111 through the second exhaust groove 113 and then be discharged through the explosion-proof hole 111.

[0040] It should be noted that since the second exhaust groove 113 is arranged around the explosion-proof hole 111, after the gas diffuses from the first exhaust groove 112 into the second exhaust groove 113, the gas can diffuse along the second exhaust groove 113 to the circumference of the explosion-proof hole 111 and flow into the explosion-proof hole 111 from different directions. In this way, when the gas pressure is high, the annular second exhaust groove 113 can accommodate some gas, which can prevent gas from accumulating at the connection between the first exhaust groove 112 and the second exhaust groove 113, thereby improving exhaust efficiency and reducing the pressure of gas discharge.

[0041] like Figure 2 and Figure 4As shown, the second exhaust groove 113 and the explosion-proof hole 111 are distributed along the first direction. The first exhaust groove 112 and the second exhaust groove 113 are located on the same side of the cover plate 110. The depth of the second exhaust groove 113 is greater than the depth of the first exhaust groove 112. In this way, after the gas diffuses from the first exhaust groove 112 to the second exhaust groove 113, the second exhaust groove 113 can accommodate part of the gas, play a certain buffering role, and effectively reduce the exhaust pressure of the gas.

[0042] like Figure 2 As shown, the second exhaust groove 113 is along a third direction (which can be understood as the length direction of the cover plate 110, see reference for details). Figure 2 The opposite sides (in the X-axis direction) are respectively connected to different first exhaust grooves 112. That is to say, in Figure 2 In the embodiment shown, there can be two first exhaust channels 112. The two first exhaust channels 112 are respectively connected to the two opposite sides of the second exhaust channel 113 along the third direction. In this way, gas can flow into the second exhaust channel 113 through the two first exhaust channels 112, which can effectively improve the exhaust efficiency.

[0043] In one embodiment, the lengths of the two first exhaust grooves 112 along the third direction may be equal or unequal.

[0044] In one embodiment, the two first exhaust grooves 112 are along the second direction (which can be understood as the width direction of the cover plate 110, see reference for details). Figure 2 The widths (in the Y-axis direction) can be equal or unequal.

[0045] In one embodiment, there may be multiple first exhaust grooves 112, and the multiple first exhaust grooves 112 may be distributed circumferentially along the second exhaust groove 113.

[0046] like Figure 4 As shown, a first stepped surface 114 is formed between the second exhaust groove 113 and the explosion-proof hole 111. The first stepped surface 114 is along the centripetal direction of the second exhaust groove 113 (which can be understood as the direction in which the inner wall of the second exhaust groove 113 is perpendicular to the central axis of the second exhaust groove 113, specifically in...). Figure 4 The width (referring to the X-axis direction) shown in the diagram is A, in mm. It should be understood that if the width A is too small, after the explosion-proof valve 120 is installed into the explosion-proof hole 111, the inner wall of the second vent groove 113 may easily obstruct the welding head from contacting the explosion-proof valve 120, affecting the welding quality of the explosion-proof valve 120. If the width A is too large, while ensuring the explosion-proof hole 111 matches the explosion-proof valve 120, the opening size of the second vent groove 113 will be too large, affecting the structural strength of the cover plate 110 and causing the cover plate 110 to easily deform and crack.

[0047] Therefore, in this embodiment, the width A is limited to the following range: 0.5mm≤A≤3mm. This can effectively improve the problems caused by the aforementioned width A being too large or too small.

[0048] In one embodiment, the width A can be selected as 0.5mm, 2.5mm, or 3mm.

[0049] like Figure 4 As shown, the depth of the first exhaust groove 112 along the first direction is D, in mm, and the depth of the second exhaust groove 113 along the first direction is C, in mm. It should be understood that if the depth D is too small, the amount of gas passing through the first exhaust groove 112 will be limited. If blockage occurs in the area between the electrode assembly and the explosion-proof valve 120, the gas cannot be discharged in time, potentially causing safety issues. If the depth D is too large (D > C), some gas in the first exhaust groove 112 will be obstructed by the sidewall of the second exhaust groove 113, making it difficult to enter the second exhaust groove 113. This affects the efficiency of gas diffusion from the first exhaust groove 112 to the second exhaust groove 113, thus affecting the overall exhaust efficiency.

[0050] Therefore, in this embodiment, the depth D is limited to the following range: 0.2mm ≤ D ≤ C. This effectively improves the problems caused by the aforementioned excessively large or small depth D. The range of values ​​for depth C will be described in detail later.

[0051] In one embodiment, the depth D can be selected as 0.2 mm, 0.5 mm, etc.

[0052] like Figure 4 As shown, the cover plate 110 includes a first side 115 and a second side 116 distributed along a first direction. The second side 116 is provided with the aforementioned first exhaust groove 112 and second exhaust groove 113. The first stepped surface 114 and the first side 115 are along the first direction (refer to...). Figure 4 The spacing along the Z-axis (in the image) is E, in mm.

[0053] It should be noted that if the spacing E is too small, it means that the thickness of the solid structure between the first step surface 114 and the first side 115 is relatively thin, which can easily affect the structural strength of the cover plate 110, and the cover plate 110 is prone to breakage and deformation.

[0054] Therefore, in this application embodiment, the spacing E is limited to the following range: E≥0.7mm, which can effectively improve the aforementioned problems caused by the spacing E being too small.

[0055] In one embodiment, the spacing E can be selected as 0.7 mm, 1 mm, etc.

[0056] like Figure 4As shown, the depth of the aforementioned second exhaust groove 113 along the first direction is C, in mm. It should be noted that a depth C that is too small can easily lead to two problems. Firstly, if the depth C is too small, the second exhaust groove 113 cannot diffuse the gas, affecting exhaust efficiency and causing excessive exhaust pressure, which can easily lead to safety issues. Secondly, if the depth C is too small, after the explosion-proof valve 120 is installed into the explosion-proof hole 111, the bottom wall of the explosion-proof valve 120 along the first direction can easily approach the lower plastic 130 (refer to...). Figure 2 and Figure 4 As shown, the lower plastic 130 is located on the side of the cover plate 110 near the electrode assembly (that is, the lower plastic 130 is located on the aforementioned second side 116), which can easily cause the bottom wall of the explosion-proof valve 120 to rub against the lower plastic 130, damaging the explosion-proof valve 120 or the lower plastic 130.

[0057] Therefore, in this embodiment, the depth C is limited to the following range: C≥0.2mm. This can effectively improve the aforementioned problems caused by the depth C being too small.

[0058] Furthermore, such as Figure 4 As shown, the thickness of the cover plate 110 along the first direction is H, in mm, and C=HE. By limiting the range of the spacing E (E≥0.7mm) as described above, the maximum value of C can be limited. In this way, the problem caused by the excessive depth C can be effectively improved (the thickness of the solid structure between the first step surface 114 and the second side 116 is relatively thin, which can easily affect the structural strength of the cover plate 110, and the cover plate 110 is prone to breakage and deformation).

[0059] In one embodiment, C can be selected as 0.2mm, 0.5mm, 1mm, etc.

[0060] It should be noted that in practical applications, after the explosion-proof valve 120 is installed into the explosion-proof hole 111, the outer wall of the explosion-proof valve 120 and the inner wall of the explosion-proof hole 111 are welded. During the welding process, the cover plate 110 is subject to welding stress, which can easily lead to deformation and cracking. Therefore, as... Figure 2 and Figure 4 As shown, the aforementioned first side 115 is provided with a boss 117. The boss 117 and the second vent groove 113 are arranged opposite to each other along the first direction. One end of the explosion-proof hole 111 passes through the boss 117, and the other end of the explosion-proof hole 111 is connected to the second vent groove 113. In this way, the boss 117 can enhance the overall rigidity and strength of the cover plate 110, thereby improving the problem that the cover plate 110 is prone to deformation and cracking during the welding process.

[0061] Figure 5 This is a schematic diagram of the structure of a cover plate provided for an exemplary embodiment of this application. Figure 5As shown, the edge of the second exhaust groove 113 and the edge of the cover plate 110 are along the second direction (which can be understood as the width direction of the cover plate 110, see reference for details). Figure 5 The spacing along the Y-axis (in the image) is F, in mm.

[0062] It should be noted that if the spacing F is too small, the edge of the second exhaust groove 113 will be too close to the edge of the cover plate 110, and the second exhaust groove 113 will occupy a large proportion of the width of the cover plate 110 along the second direction, affecting the overall structural strength of the cover plate 110 and making the cover plate 110 prone to deformation and cracking. If the spacing F is too large, it will affect the size design of the explosion-proof hole 111 and the explosion-proof valve 120, which may result in the designed explosion-proof hole 111 and the explosion-proof valve 120 being too small. This is not only not conducive to processing and forming, but also affects the subsequent exhaust efficiency.

[0063] Therefore, in this embodiment, the spacing F is limited to the following range: 1.5mm ≤ F ≤ 30mm. This can improve the problems caused by the aforementioned spacing F being too small or too large.

[0064] In one embodiment, the spacing F can be selected as 1.5mm, 5mm, 15mm, 30mm, etc.

[0065] The present application solution will be further described below with reference to specific embodiments.

[0066] Example 1

[0067] The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed inside the housing. The cover plate assembly 100 includes a cover plate 110 and an explosion-proof valve 120. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 has an explosion-proof hole 111 extending along a first direction. The cover plate 110 has a first vent groove 112 on one side along the first direction, and one end of the first vent groove 112 communicates with the explosion-proof hole 111. The explosion-proof valve 120 is disposed inside the explosion-proof hole 111.

[0068] The cover plate 110 is also provided with a second exhaust groove 113 on one side along the first direction. The second exhaust groove 113 and the first exhaust groove 112 are located on the same side of the cover plate 110. The second exhaust groove 113 is arranged around the explosion-proof hole 111 and connects the explosion-proof hole 111 and the first exhaust groove 112.

[0069] A first stepped surface 114 is formed between the second exhaust groove 113 and the explosion-proof hole 111, and the width of the first stepped surface 114 along the centripetal direction of the second exhaust groove 113 is A.

[0070] In this embodiment, A = 0.5 mm.

[0071] Example 2

[0072] This embodiment is basically the same as embodiment 1, except that:

[0073] In this embodiment, A = 0.8 mm.

[0074] Example 3

[0075] This embodiment is basically the same as embodiment 1, except that:

[0076] In this embodiment, A = 1.1 mm.

[0077] Example 4

[0078] This embodiment is basically the same as embodiment 1, except that:

[0079] In this embodiment, A = 1.4 mm.

[0080] Example 5

[0081] This embodiment is basically the same as embodiment 1, except that:

[0082] In this embodiment, A = 2 mm.

[0083] Example 6

[0084] This embodiment is basically the same as embodiment 1, except that:

[0085] In this embodiment, A = 2.3 mm.

[0086] Example 7

[0087] This embodiment is basically the same as embodiment 1, except that:

[0088] In this embodiment, A = 3 mm.

[0089] Comparative Example 1

[0090] This comparative example is basically the same as Example 1, except that:

[0091] In this comparative example, A = 0.2 mm.

[0092] Comparative Example 2

[0093] This comparative example is basically the same as Example 1, except that:

[0094] In this comparative example, A = 5 mm.

[0095] Test results

[0096] The welded structure between the explosion-proof valve 120 and the cover plate 110 was inspected; the structural strength of the stamped cover plate 110 was also inspected. The inspection results are shown in Table 1.

[0097] Table 1

[0098]

[0099] Example 8

[0100] The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed inside the housing. The cover plate assembly 100 includes a cover plate 110 and an explosion-proof valve 120. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 has an explosion-proof hole 111 extending along a first direction. The cover plate 110 has a first vent groove 112 on one side along the first direction, and one end of the first vent groove 112 communicates with the explosion-proof hole 111. The explosion-proof valve 120 is disposed inside the explosion-proof hole 111.

[0101] The cover plate 110 is also provided with a second exhaust groove 113 on one side along the first direction. The second exhaust groove 113 and the first exhaust groove 112 are located on the same side of the cover plate 110. The second exhaust groove 113 is arranged around the explosion-proof hole 111 and connects the explosion-proof hole 111 and the first exhaust groove 112.

[0102] The depth of the first exhaust groove 112 along the first direction is D, and the depth of the second exhaust groove 113 along the first direction is C.

[0103] In this embodiment, C=0.2mm; D=0.2mm.

[0104] Example 9

[0105] This embodiment is basically the same as embodiment 8, except that:

[0106] In this embodiment, C=1.2mm; D=1.2mm.

[0107] Example 10

[0108] This embodiment is basically the same as embodiment 8, except that:

[0109] In this embodiment, C=1mm; D=0.9mm.

[0110] Example 11

[0111] This embodiment is basically the same as embodiment 8, except that:

[0112] In this embodiment, C=1mm; D=0.3mm.

[0113] Example 12

[0114] This embodiment is basically the same as embodiment 8, except that:

[0115] In this embodiment, C=0.6mm; D=0.5mm.

[0116] Example 13

[0117] This embodiment is basically the same as embodiment 8, except that:

[0118] In this embodiment, C=0.5mm; D=0.5mm.

[0119] Example 14

[0120] This embodiment is basically the same as embodiment 8, except that:

[0121] In this embodiment, C=0.4mm; D=0.3mm.

[0122] Comparative Example 3

[0123] This comparative example is basically the same as Example 8, except that:

[0124] In this comparative example, C = 0.5 mm; D = 0.1 mm.

[0125] Comparative Example 4

[0126] This comparative example is basically the same as Example 8, except that:

[0127] In this comparative example, C = 0.8 mm; D = 1 mm.

[0128] Comparative Example 5

[0129] This comparative example is basically the same as Example 8, except that:

[0130] In this comparative example, C = 0.1 mm; D = 0.1 mm.

[0131] Test results

[0132] The structural strength of the cover plate 110 was tested; the exhaust speed was tested after the explosion-proof valve 120 was opened; and the friction between the explosion-proof valve 120 and the lower plastic 130 was tested. The test results are shown in Table 2.

[0133] Table 2

[0134]

[0135] Example 15

[0136] The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed inside the housing. The cover plate assembly 100 includes a cover plate 110 and an explosion-proof valve 120. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 has an explosion-proof hole 111 extending along a first direction. The cover plate 110 has a first vent groove 112 on one side along the first direction, and one end of the first vent groove 112 communicates with the explosion-proof hole 111. The explosion-proof valve 120 is disposed inside the explosion-proof hole 111.

[0137] The cover plate 110 is also provided with a second exhaust groove 113 on one side along the first direction. The second exhaust groove 113 and the first exhaust groove 112 are located on the same side of the cover plate 110. The second exhaust groove 113 is arranged around the explosion-proof hole 111 and connects the explosion-proof hole 111 and the first exhaust groove 112.

[0138] The cover plate 110 includes a first side 115 and a second side 116 distributed along a first direction. The second side 116 is provided with a first exhaust groove 112 and a second exhaust groove 113. A first step surface 114 is formed between the second exhaust groove 113 and the explosion-proof hole 111. The distance between the first step surface 114 and the first side 115 along the first direction is E.

[0139] In this embodiment, E = 0.7 mm.

[0140] Example 16

[0141] This embodiment is basically the same as embodiment 15, except that:

[0142] In this embodiment, E = 0.9 mm.

[0143] Example 17

[0144] This embodiment is basically the same as embodiment 15, except that:

[0145] In this embodiment, E = 1 mm.

[0146] Example 18

[0147] This embodiment is basically the same as embodiment 15, except that:

[0148] In this embodiment, E = 1.3 mm.

[0149] Example 19

[0150] This embodiment is basically the same as embodiment 15, except that:

[0151] In this embodiment, E = 1.8 mm.

[0152] Comparative Example 6

[0153] This comparative example is basically the same as Example 15, except that:

[0154] In this comparative example, E = 0.3 mm.

[0155] Comparative Example 7

[0156] This comparative example is basically the same as Example 15, except that:

[0157] In this comparative example, E = 0.5 mm.

[0158] Comparative Example 8

[0159] This comparative example is basically the same as Example 15, except that:

[0160] In this comparative example, E = 0.2 mm.

[0161] Test results

[0162] The structural strength of the stamped cover plate 110 was tested. The test results are shown in Table 3.

[0163] Table 3

[0164]

[0165] Example 20

[0166] The battery cell includes a housing, electrode assembly, and cover plate assembly 100. The housing has an opening, and the electrode assembly is disposed inside the housing. The cover plate assembly 100 includes a cover plate 110 and an explosion-proof valve 120. The cover plate 110 is disposed at one end of the electrode assembly and is connected to the housing to close the opening. The cover plate 110 has an explosion-proof hole 111 extending along a first direction. The cover plate 110 has a first vent groove 112 on one side along the first direction, and one end of the first vent groove 112 communicates with the explosion-proof hole 111. The explosion-proof valve 120 is disposed inside the explosion-proof hole 111.

[0167] The cover plate 110 is also provided with a second exhaust groove 113 on one side along the first direction. The second exhaust groove 113 and the first exhaust groove 112 are located on the same side of the cover plate 110. The second exhaust groove 113 is arranged around the explosion-proof hole 111 and connects the explosion-proof hole 111 and the first exhaust groove 112.

[0168] The distance between the edge of the second exhaust groove 113 and the edge of the cover plate 110 along the second direction is F.

[0169] In this embodiment, F = 1.5 mm.

[0170] Example 21

[0171] This embodiment is basically the same as embodiment 20, except that:

[0172] In this embodiment, F = 2 mm.

[0173] Example 22

[0174] This embodiment is basically the same as embodiment 20, except that:

[0175] In this embodiment, F=5mm.

[0176] Example 23

[0177] This embodiment is basically the same as embodiment 20, except that:

[0178] In this embodiment, F = 8 mm.

[0179] Example 24

[0180] This embodiment is basically the same as embodiment 20, except that:

[0181] In this embodiment, F = 15 mm.

[0182] Example 25

[0183] This embodiment is basically the same as embodiment 20, except that:

[0184] In this embodiment, F = 30 mm.

[0185] Comparative Example 8

[0186] This comparative example is basically the same as Example 20, except that:

[0187] In this comparative example, F = 1 mm.

[0188] Comparative Example 9

[0189] This comparative example is basically the same as Example 20, except that:

[0190] In this comparative example, F = 35 mm.

[0191] Test results

[0192] The structural strength and yield of the stamped cover plate 110 were tested. The test results are shown in Table 4.

[0193] Table 4

[0194]

[0195] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0196] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0197] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0198] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0199] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate is provided with an explosion-proof hole extending through a first direction. The cover plate has a first vent groove on one side along the first direction, and one end of the first vent groove is connected to the explosion-proof hole. The first direction represents the thickness direction of the cover plate. The cover plate also has a second vent groove on one side along the first direction. The second vent groove and the first vent groove are located on the same side of the cover plate. The second vent groove is arranged around the explosion-proof hole and connects the explosion-proof hole and the first vent groove. An explosion-proof valve is installed inside the explosion-proof hole; Wherein, the depth of the first exhaust groove along the first direction is D, in mm, and the depth of the second exhaust groove along the first direction is C, in mm, and D and C satisfy: 0.2mm≤D≤C; Wherein, the distance between the edge of the second exhaust groove and the edge of the cover plate along the second direction is F, in mm, and F satisfies: 1.5mm≤F≤30mm; wherein, the second direction represents the width direction of the cover plate; The cover plate includes a first side and a second side distributed along the first direction. The second side is provided with the first exhaust groove and the second exhaust groove. A first step surface is formed between the second exhaust groove and the explosion-proof hole. The distance between the first step surface and the first side along the first direction is E, in mm. E satisfies: E≥0.7mm. Wherein, the thickness of the cover plate along the first direction is H, in mm, and C and H satisfy: 0.2mm≤C=HE.

2. The cover plate assembly according to claim 1, characterized in that, A first step surface is formed between the second exhaust groove and the explosion-proof hole. The width of the first step surface along the centripetal direction of the second exhaust groove is A, in mm. A satisfies: 0.5mm≤A≤3mm. The centripetal direction of the second exhaust groove represents the direction in which the inner wall of the second exhaust groove is perpendicular to the central axis of the second exhaust groove.

3. The cover plate assembly according to claim 1, characterized in that, The first side is provided with a boss, the boss and the second exhaust groove are arranged opposite to each other along the first direction, one end of the explosion-proof hole passes through the boss, and the other end of the explosion-proof hole is connected to the second exhaust groove.

4. The cover plate assembly according to claim 1, characterized in that, The second exhaust groove is connected to different first exhaust grooves on opposite sides along a third direction; wherein, the third direction represents the length direction of the cover plate.

5. A battery cell, characterized in that, include: The casing has an opening; The pole assembly is located within the housing; The cover plate assembly as described in any one of claims 1 to 4, wherein the cover plate is disposed at one end of the electrode assembly, and the cover plate is connected to the housing to close the opening.

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