Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer, the battery top cover comprises a top cover body and an anti-explosion sheet, the top cover body is used for covering an opening of a battery shell, the anti-explosion sheet is arranged on the top cover body, and a first thinning area and a second thinning area are arranged on the anti-explosion sheet; the first thinning area and the second thinning area are symmetrically arranged about a first symmetric line, the first symmetric line is parallel to the length direction of the top cover body, and the battery top cover has the effects of improving the safety and the stability of the battery monomer and also has the effects of improving the production efficiency and reducing the production cost.

Description

Technical Field

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

[0002] Single cells are usually equipped with explosion-proof plates. In extreme cases, the explosion-proof plates can explode open to discharge high-temperature and high-pressure substances in the single cell, ensuring the safe use of the single cell.

[0003] In existing technology, the explosion-proof disc is notched, and the notches are typically unilateral. Specifically, the notches are only located on one side of the disc across the width of the battery cell, leaving the other half unnotched. Due to the uneven pressure distribution within the battery cell, the position of the notches across the width of the battery cell results in different burst values, which in turn reduces the safety and stability of the battery cell.

[0004] In order to make the explosion values ​​of multiple explosion-proof plates the same, the current method is to manually distinguish or identify them with a CCD device when assembling the battery top cover and the explosion-proof plates so that the notches of the explosion-proof plates on the battery top cover are located on the same side in the width direction of the battery top cover. This method is inefficient and costly.

[0005] Therefore, it is urgent to propose a battery top cover and a battery cell to solve the above technical problems. Utility Model Content

[0006] The first object of the present utility model is to provide a battery top cover, which has the effect of improving the safety and stability of the battery monomer, and also has the effect of improving production efficiency and reducing production costs.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] Battery cover, including:

[0009] A top cover body, which is used to cover the opening of the battery shell;

[0010] The explosion-proof plate is arranged on the top cover body. The explosion-proof plate is provided with a first thinning area and a second thinning area. The first thinning area and the second thinning area are symmetrically arranged about a first symmetry line, and the first symmetry line is parallel to the length direction of the top cover body.

[0011] Optionally, there is still a connecting part on the explosion-proof plate, and the two ends of the first thinning area are respectively connected to the corresponding end of the connecting part, forming a first diaphragm between the first thinning area and the connecting part, and the two ends of the second thinning area are respectively connected to the corresponding end of the connecting part, forming a second diaphragm between the second thinning area and the connecting part.

[0012] Optionally, the connecting portion is S-shaped.

[0013] Optionally, the edge of the rupture disc is provided with a thickened portion, the thickened portion extends along the circumference of the rupture disc and is connected at both ends, and the rupture disc is connected to the top cover body through the thickened portion.

[0014] Optionally, the thickened portion is provided with a protrusion, the protrusion is arranged on the side of the connecting portion away from the battery shell, the number of the protrusions is two, and the two protrusions are respectively located at the two ends of the connecting portion.

[0015] Optionally, the first thinning area includes a first notch, and the second thinning area includes a second notch, and the first notch and the second notch are symmetrically arranged about the first symmetry line.

[0016] Optionally, the first thinning area further includes two third notches, and the two ends of the first notch are respectively connected to a corresponding one of the third notches.

[0017] The second thinning area further includes two fourth notches, and the two ends of the second notch are respectively connected to a corresponding one of the fourth notches, and each third notch is symmetrically arranged with a corresponding fourth notch about the first symmetry line.

[0018] Optionally, the two third notches are symmetrically arranged about a second symmetry line, the two fourth notches are symmetrically arranged about the second symmetry line, and the second symmetry line is parallel to the width direction of the top cover body.

[0019] Optionally, the first notch and the second notch are both straight lines, the two third notches and the two fourth notches are both arc-shaped, the two third notches are both curved in directions away from each other, the two fourth notches are both curved in directions away from each other, and the third notch and the fourth notch on the same side of the second symmetry line are both curved in directions away from each other.

[0020] The second purpose of the utility model is to provide a battery monomer, which has high safety and stability, and also has high production efficiency and low production cost.

[0021] To achieve this purpose, the utility model adopts the following technical solutions:

[0022] The battery monomer comprises a battery cell, a battery shell and the above-mentioned battery top cover, the battery cell is arranged in the battery shell, and the top cover body is arranged at the opening of the battery shell.

[0023] The utility model has the advantages of:

[0024] The battery top cover provided by the utility model, the explosion-proof sheet is arranged on the top cover body, the first thinning area and the second thinning area are arranged on the explosion-proof sheet, the first thinning area and the second thinning area are symmetrically arranged about the first symmetry line, the first symmetry line is parallel to the length direction of the top cover body, when the internal pressure of the battery shell increases, the first thinning area and the second thinning area are forced simultaneously and can be broken simultaneously, thereby realizing the bidirectional symmetric explosion of the explosion-proof sheet, compared with the single-side notch structure, the structure that the first thinning area and the second thinning area are symmetric about the first symmetry line reduces the probability that the explosion values of the plurality of explosion-proof sheets are different, has the effect of improving the safety and stability of the battery monomer, and in the production process, the position process of manually distinguishing and the CCD equipment identifying the thinning area is omitted, has the effect of improving the production efficiency and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structural schematic view of the battery monomer (when the explosion-proof sheet is not exploded) provided by the utility model;

[0026] Figure 2 is the structural schematic view of the explosion-proof sheet (when not exploded) provided by the utility model;

[0027] Figure 3 is the structural schematic view of the battery monomer (after the explosion-proof sheet is exploded) provided by the utility model;

[0028] Figure 4 is the structural schematic view of the explosion-proof sheet (after exploded) provided by the utility model.

[0029] In the drawing:

[0030] 100, top cover body; 200, explosion-proof sheet; 210, first thinning area; 211, first notch; 212, third notch; 220, second thinning area; 221, second notch; 222, fourth notch; 230, connecting part; 241, first diaphragm; 242, second diaphragm; 250, thickening part; 251, protruding block; 10, battery shell; D1, first symmetry line; D2, second symmetry line. DETAILED DESCRIPTION

[0031] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all the structures.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] This embodiment provides a battery top cover, which has the effects of improving the safety and stability of a battery cell, and also has the effects of improving production efficiency and reducing production costs.

[0036] Specifically, if Figures 1 to 4 As shown, the battery top cover includes a top cover body 100 and an explosion-proof plate 200, wherein the top cover body 100 is used to cover the opening of the battery shell 10, and the explosion-proof plate 200 is arranged at the center of the top cover body 100. The explosion-proof plate 200 is provided with a first thinning area 210 and a second thinning area 220. The first thinning area 210 and the second thinning area 220 are symmetrically arranged about a first symmetry line D1, and the first symmetry line D1 is parallel to the length direction of the top cover body 100 (x direction in the figure).

[0037] Based on the above design, the explosion-proof sheet 200 is arranged on the top cover body 100, the first thinning area 210 and the second thinning area 220 are arranged on the explosion-proof sheet 200, the first thinning area 210 and the second thinning area 220 are symmetrically arranged about the first symmetry line D1, the first symmetry line D1 is parallel to the length direction of the top cover body 100, when the internal pressure of the battery shell 10 rises, the first thinning area 210 and the second thinning area 220 are simultaneously stressed and can be broken, thereby realizing the bidirectional symmetric explosion of the explosion-proof sheet 200. Compared with the single-side notch structure, the structure that the first thinning area 210 and the second thinning area 220 are symmetric about the first symmetry line D1 reduces the probability that the explosion-proof sheets 200 have different explosion values, has the effect of improving the safety and stability of the battery monomer, and in the production process, the process of manually distinguishing and identifying the position of the thinning area by the CCD equipment is omitted, which has the effects of improving the production efficiency and reducing the production cost.

[0038] Optionally, as shown in Figures 1 to 4 , the explosion-proof sheet 200 also has a connecting portion 230, the connecting portion 230 is located between the first thinning area 210 and the second thinning area 220, the two ends of the first thinning area 210 are respectively connected to one end of the connecting portion 230 corresponding, a first diaphragm 241 is formed between the first thinning area 210 and the connecting portion 230, the two ends of the second thinning area 220 are respectively connected to one end of the connecting portion 230 corresponding, a second diaphragm 242 is formed between the second thinning area 220 and the connecting portion 230, after the first thinning area 210 and the second thinning area 220 are broken, the first diaphragm 241 and the second diaphragm 242 are lifted in the direction away from the battery shell 10, the arrangement of the connecting portion 230 can prevent the first diaphragm 241 and the second diaphragm 242 from flying out of the explosion-proof sheet 200, and the use safety of the explosion-proof sheet 200 is improved.

[0039] Further, as shown in Figures 1 to 4 , the connecting portion 230 is S-shaped, the S-shaped connecting portion 230 can increase the connection length of the connecting portion 230 and the first diaphragm 241 and the second diaphragm 242, thereby improving the reliability of the connection between the first diaphragm 241 and the connecting portion 230 and the reliability of the connection between the second diaphragm 242 and the connecting portion 230. Moreover, the S-shaped connecting portion 230 can make the stress of the first diaphragm 241 and the second diaphragm 242 more uniform and dispersed, which is conducive to improving the accurate control of the lifting angle of the first diaphragm 241 and the second diaphragm 242.

[0040] Optionally, as shown in Figures 1 to 4 , the edge of the explosion-proof sheet 200 is provided with a thickening portion 250, the thickening portion 250 extends along the circumference of the explosion-proof sheet 200 and is connected end to end, the explosion-proof sheet 200 is connected with the top cover body 100 through the thickening portion 250, thereby expanding the connection volume of the explosion-proof sheet 200 and the top cover body 100, and further improving the reliability of the connection between the explosion-proof sheet 200 and the top cover body 100.

[0041] Further, as shown in Figures 1 to 4 The thickened portion 250 is provided with protrusions 251, which are arranged on the side of the connecting portion 230 away from the battery shell 10. The protrusions 251 can exert a force on the connecting portion 230 in the direction of the battery shell 10. The angles at which the first diaphragm 241 and the second diaphragm 242 are lifted will change with the size of the force. Specifically, when the protrusions 251 exert a larger force on the connecting portion 230, the angles at which the first diaphragm 241 and the second diaphragm 242 are lifted will be smaller. When the protrusions 251 exert a smaller force on the connecting portion 230, the angles at which the first diaphragm 241 and the second diaphragm 242 are lifted will be larger. Therefore, in actual applications, the size of the force that the protrusions 251 exert on the connecting portion 230 can be changed by changing the weight of the protrusions 251, and the angles at which the first diaphragm 241 and the second diaphragm 242 are lifted can be changed, thereby achieving control over the angles at which the first diaphragm 241 and the second diaphragm 242 are lifted.

[0042] Further, as shown in Figures 1 to 4 The number of protrusions 251 is two, and the two protrusions 251 are arranged at the two ends of the connecting portion 230, so that the two ends of the connecting portion 230 are subjected to a more uniform force, thereby improving the control accuracy of the angles at which the first diaphragm 241 and the second diaphragm 242 are lifted.

[0043] It should be noted that in the present embodiment, the protrusions 251 are arranged on the thickened portion 250, and therefore the design of the protrusions 251 will not be affected by the thickness of the first thinning region 210 and the second thinning region 220 of the rupture disc 200.

[0044] Optionally, as shown in Figures 1 to 4 The first thinning region 210 includes a first score line 211, and the second thinning region 220 includes a second score line 221. The first score line 211 and the second score line 221 are symmetrically arranged about the first symmetry line D1. When the internal pressure of the battery shell 10 rises, the first score line 211 and the second score line 221 that are symmetrically arranged about the first symmetry line D1 are subjected to a force and broken, thereby achieving bidirectional symmetric rupture of the rupture disc 200.

[0045] Further, as shown in Figures 1 to 4As shown, the first thinning area 210 further comprises two third score lines 212, and two ends of the first score line 211 are connected with a corresponding one of the third score lines 212 respectively; the second thinning area 220 further comprises two fourth score lines 222, and two ends of the second score line 221 are connected with a corresponding one of the fourth score lines 222 respectively, and each of the third score lines 212 is symmetrically arranged with a corresponding one of the fourth score lines 222 about the first symmetry line D1. The structure design enlarges the area of the first thinning area 210 and the second thinning area 220, and when the explosion-proof sheet 200 explodes, the high-pressure gas in the battery shell 10 can not only be discharged out of the battery shell 10 through the first score line 211 and the second score line 221, but also be discharged out of the battery shell 10 through the two third score lines 212 and the two fourth score lines 222, thereby realizing the rapid exhaust effect of the explosion-proof sheet 200 and improving the safety of the battery monomer.

[0046] In the embodiment, as shown in the drawings, Figures 1 to 4 two ends of the two third score lines 212 away from the first score line 211 are connected with a corresponding end of the connecting part 230 respectively, that is, the connecting part 230, the first score line 211 and the two third score lines 212 form the first diaphragm 241; and two ends of the two fourth score lines 222 away from the second score line 221 are connected with a corresponding end of the connecting part 230 respectively, that is, the connecting part 230, the second score line 221 and the two fourth score lines 222 form the second diaphragm 242.

[0047] Further, as shown in the drawings, Figures 1 to 4 the two third score lines 212 are symmetrically arranged about the second symmetry line D2, and the two fourth score lines 222 are symmetrically arranged about the second symmetry line D2, and the second symmetry line D2 is parallel to the width direction (y direction in the drawings) of the top cover body 100. The structure design improves the symmetry of the explosion-proof sheet 200, and further can further reduce the probability that the explosion-proof values of the plurality of explosion-proof sheets 200 are different, thereby further improving the safety and stability of the battery monomer.

[0048] Further, as shown in the drawings, Figures 1 to 4 the explosion-proof sheet 200 is in a runway shape, and the first thinning area 210 and the second thinning area 220 form the runway shape after being connected by the connecting part 230. Specifically, the first score line 211 and the second score line 221 are both in a straight line shape, the two third score lines 212 and the two fourth score lines 222 are both in an arc shape, the two third score lines 212 are both curved in directions away from each other, the two fourth score lines 222 are both curved in directions away from each other, and the third score line 212 and the fourth score line 222 on the same side of the second symmetry line D2 are both curved in directions away from each other, so that the first score line 211, the second score line 221, the two third score lines 212 and the two fourth score lines 222 form the runway shape.

[0049] It should be noted that the change of the burst pressure value of the rupture disc 200 can be realized by changing the depth of the first score 211, the second score 221, the third score 212 and the fourth score 222.

[0050] The embodiment also provides a battery monomer, which comprises an electric core, a battery shell 10 and the battery top cover, the electric core is arranged in the battery shell 10, and the top cover body 100 is arranged on the opening of the battery shell 10, the battery monomer adopts the battery top cover, so that the safety and stability are high, and the production efficiency is high and the production cost is low.

[0051] The rupture disc 200 is suitable for a large-capacity rectangular battery monomer, wherein the first score 211 and the second score 221 of the rupture disc 200 are parallel to the length direction of the top cover body 100 after the top cover body 100 and the battery shell 10 are assembled.

[0052] The following lists the size parameters of the battery monomer suitable for the rupture disc 200, wherein the size of the battery monomer in the width direction (y direction) is referred to as N1, and the size of the battery monomer in the length direction (x direction) is referred to as N2.

[0053] Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to Figure 4 Figure 1 to 1 40 148 2 53 148 3 57 148 4 79 148 5 86 148 6 40 173 7 45 173 8 48 173 9 53 173 10 71 173 11 53 217

[0054] Obviously, the above embodiment of the utility model is only for the purpose of clear illustration, and is not a limitation on the embodiment of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery top cover characterized by, The application relates to a battery cover, which comprises: a top cover body (100) used for covering an opening of a battery shell (10); an explosion-proof sheet (200) arranged on the top cover body (100), wherein a first thinning area (210) and a second thinning area (220) are arranged on the explosion-proof sheet (200) and are symmetrically arranged about a first symmetry line (D1) parallel to the length direction of the top cover body (100).

2. The battery header of claim 1, wherein, The explosion-proof sheet (200) further comprises connecting portions (230), two ends of the first thinning area (210) are respectively connected to one end of the corresponding connecting portion (230), a first diaphragm (241) is formed between the first thinning area (210) and the connecting portion (230), two ends of the second thinning area (220) are respectively connected to one end of the corresponding connecting portion (230), and a second diaphragm (242) is formed between the second thinning area (220) and the connecting portion (230).

3. The battery header of claim 2, wherein, The connecting portion (230) is S-shaped.

4. The battery cup of claim 2, wherein: The edge of the explosion-proof sheet (200) is provided with thickening portions (250), the thickening portions (250) are connected end to end along the circumferential direction of the explosion-proof sheet (200), and the explosion-proof sheet (200) is connected to the top cover body (100) through the thickening portions (250).

5. The battery header of claim 4, wherein, The thickening portions (250) are provided with protrusions (251), the protrusions (251) are arranged on the side of the connecting portion (230) away from the battery shell (10), the number of the protrusions (251) is two, and the two protrusions (251) are respectively arranged at the two ends of the connecting portion (230).

6. The battery cover of any one of claims 1-5, wherein, The first thinning area (210) comprises a first notch (211), the second thinning area (220) comprises a second notch (221), and the first notch (211) and the second notch (221) are symmetrically arranged about the first symmetry line (D1).

7. The battery header of claim 6, wherein, The first thinning area (210) further comprises two third notches (212), and two ends of the first notch (211) are respectively connected to the corresponding one of the third notches (212). The second thinning area (220) further comprises two fourth notches (222), two ends of the second notch (221) are respectively connected to the corresponding one of the fourth notches (222), and each of the third notches (212) and the corresponding one of the fourth notches (222) are symmetrically arranged about the first symmetry line (D1).

8. The battery header of claim 7, wherein, The two third notches (212) are symmetrically arranged about a second symmetry line (D2), the two fourth notches (222) are symmetrically arranged about the second symmetry line (D2), and the second symmetry line (D2) is parallel to the width direction of the top cover body (100).

9. The battery header of claim 8, wherein, The first score line (211) and the second score line (221) are linear, the two third score lines (212) and the two fourth score lines (222) are arc-shaped, the two third score lines (212) are curved in directions away from each other, the two fourth score lines (222) are curved in directions away from each other, and the third score line (212) and the fourth score line (222) on the same side of the second symmetry line (D2) are curved in directions away from each other.

10. A battery cell, characterized by The battery top cover comprises a cell, a battery shell (10), and the battery top cover body (100) of any one of claims 1-9, the cell is arranged in the battery shell (10), and the top cover body (100) is arranged at an opening of the battery shell (10).

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