Battery

Abstract

The utility model relates to a battery, which can give consideration to the safety problem under the condition of giving consideration to the performance parameter requirements of a battery cell, and comprises a top cover, and the top cover is provided with two pole through holes and an explosion-proof valve through hole which are arranged in a penetrating manner along the thickness direction of the top cover; along a plane perpendicular to the thickness direction of the top cover, the area of each pole through hole is A, the area of the explosion-proof valve through hole is B, the area of the top cover is C, the ratio of A to C is 0.5%-5%, and the ratio of B to C is 1.5%-8%; wherein the value range of the A is 21mm < 2 > to 3750mm < 2 >; the value range of B is 63 mm < 2 > to 6000 mm < 2 >; and the value range of C is 4200 mm < 2 > to 75000 mm < 2 >.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] The top cover of the battery is used to encapsulate it within the battery casing. The top cover has through-holes for the terminals and an explosion-proof valve. The through-holes allow the terminals of the battery cell to pass through and extend outside the casing, while the explosion-proof valve through-holes are used to install the explosion-proof valve. In existing technology, the size design of the through-holes for the terminals and the explosion-proof valve cannot simultaneously meet the performance parameter requirements and safety requirements of the battery cell. Utility Model Content

[0003] Therefore, it is necessary to provide a battery that addresses the issue that the size design of the electrode through-hole and explosion-proof valve through-hole cannot simultaneously meet the performance parameter requirements and safety issues of the battery cell.

[0004] A battery includes a top cover, on which two through-holes for terminals and an explosion-proof valve through-hole are provided, extending along the thickness direction of the top cover. Along a plane perpendicular to the thickness direction of the top cover, the area of ​​each through-hole is A, the area of ​​the explosion-proof valve through-hole is B, and the area of ​​the top cover is C. The ratio of A to C is 0.5%–5%, and the ratio of B to C is 1.5%–8%. The value of A is within the range of 21 mm. 2 ~3750mm 2 B ranges from 63mm. 2 ~6000mm 2 The value of C ranges from 4200 mm. 2 ~75000mm 2 .

[0005] In some embodiments, the top cover is a rectangular plate, the top cover includes two long sides and two short sides, the length of the long sides is L, and the length of the short sides is H.

[0006] In some embodiments, in the length direction of the top cover, the minimum distance between the explosion-proof valve through hole and the short side is L1, the ratio of L1 to L is 30% to 50%, the value of L is in the range of 140mm to 500mm, and the value of L1 is in the range of 42mm to 250mm.

[0007] In some embodiments, the minimum distance between the through hole of the pole post and the short side is L2, the ratio of L2 to L is 5% to 25%, the value of L is in the range of 140mm to 500mm, and the value of L2 is in the range of 7mm to 125mm.

[0008] In some embodiments, in the width direction of the top cover, the shortest distance between the explosion-proof valve through hole and the long side is H1, the ratio of H1 to H is 15% to 50%, the value of H is 30mm to 150mm, and the value of H1 is 4.5mm to 75mm.

[0009] In some embodiments, the shortest distance between the through hole of the pole post and the long side is H2, the ratio of H2 to H is 12% to 50%, the value of H is 30mm to 150mm, and the value of H2 is 3.6mm to 75mm.

[0010] In some embodiments, the explosion-proof valve through hole includes two straight edges and two arc-shaped edges, where L:H < 3:1, the two straight edges are spaced apart along the length of the top cover, the straight edges extend along the length of the explosion-proof valve through hole, and the straight edges are parallel to the short side of the top cover.

[0011] In some embodiments, the explosion-proof valve through hole includes two straight edges and two arc-shaped edges, wherein L:H ≥ 3:1, the two straight edges are spaced apart in the width direction of the top cover, the extension direction of the straight edges is the length direction of the explosion-proof valve through hole, and the straight edges are parallel to the long side of the top cover.

[0012] In some embodiments, in the length direction of the top cover, the explosion-proof valve through hole is located between the two pole through holes, and the two pole through holes are asymmetrically arranged with respect to the explosion-proof valve through hole.

[0013] In some embodiments, the explosion-proof valve through-hole is not centrally located along the length of the top cover.

[0014] In this application, the external dimensions of the top cover are defined as C, which ranges from 4200 mm. 2 ~75000mm 2 To ensure structural strength, the ratio of A to C is 0.5%–5%, and the ratio of B to C is 1.5%–8%, resulting in a value for A ranging from 21 mm. 2 ~3750mm 2 B ranges from 63mm. 2 ~6000mm 2 By maintaining the ratio of A to C at 0.5%–5% and the ratio of B to C at 1.5%–8%, not only is the structural strength of the top cover guaranteed, but the diameter of the pressure relief channel inside the explosion-proof valve can also be increased, allowing the battery to depressurize more quickly, improving battery safety, and ensuring the minimum overcurrent capacity of the positive and negative terminals. Thus, both the performance parameter requirements and safety requirements of the battery cell assembly are met. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment provided in this application.

[0016] Figure 2 This is a schematic diagram of the top cover according to an embodiment provided in this application.

[0017] Figure 3 This is a schematic diagram of the top cover according to another embodiment provided in this application.

[0018] Figure 4 This is a schematic diagram of the top cover according to another embodiment provided in this application.

[0019] Figure 5 This is a schematic diagram of the top cover according to another embodiment provided in this application.

[0020] Figure label:

[0021] 10. Top cover; 101. Long side; 102. Short side; 110. Through hole for pole; 120. Through hole for explosion-proof valve; 121. Straight side; 122. Arc-shaped side; 20. Housing; 30. Positive pole; 40. Negative pole; 50. Explosion-proof valve. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] See Figure 1 and Figure 2 This application provides a top cover 10 for installation at the opening of the battery casing 20, sealing the battery cell assembly (not shown) and electrolyte within the casing 20, and enabling electrical connection between the battery cell assembly and conductive components outside the casing 20. The structural design of the top cover 10 in this application embodiment can address both the performance parameter requirements of the battery cell and safety issues.

[0026] The battery cell assembly contains an electrolyte, which is the carrier of ions in the battery and is generally composed of lithium salt and organic solvent. During the charging and discharging process of a lithium battery, lithium ions move back and forth between the positive and negative electrodes. The electrolyte is the medium for the migration and transfer of lithium ions, creating a potential difference between the positive and negative electrodes, thereby generating current and enabling the battery to operate normally. The positive and negative tabs of the battery cell assembly are connected to the positive terminal 30 and the negative terminal 40, respectively.

[0027] like Figure 2 As shown, the top cover 10 has two through holes 110 and an explosion-proof valve through hole 120 extending along its thickness. The two through holes 110 are used to house the positive terminal 30 and the negative terminal 40, respectively. The two through holes 110 allow the positive terminal 30 and the negative terminal 40 to pass through and extend outside the housing 20. The explosion-proof valve through hole 120 is used to install an explosion-proof valve 50. In the event of thermal runaway of the battery, the explosion-proof valve 50 can connect the battery's interior to the outside to relieve pressure. There is at least one explosion-proof valve through hole 120. There is at least one explosion-proof valve 50.

[0028] The bottom of the positive terminal 30 or the negative terminal 40 is connected to the adapter plate of the battery cell assembly. Taking the positive terminal 30 as an example, the fixing method of the positive terminal 30 is not limited. For example, it can be an integrated terminal. The positive terminal 30 has a plastic fixing component injected on its outside. The positive terminal 30 and the plastic fixing component are pre-formed into a single piece, i.e., an integrated terminal. Then, the integrated terminal is fixed in the terminal through hole 110 through the cooperation of the plastic fixing component and the terminal through hole 110.

[0029] For a battery, the size of the through-hole 110 determines the cross-sectional area of ​​the positive terminal 30 and the negative terminal 40, which in turn determines the overcurrent capability of the battery when it is electrically connected to external conductive components. The larger the cross-sectional area of ​​the positive terminal 30 and the negative terminal 40, the stronger the overcurrent capability.

[0030] The area of ​​the through-hole 120 of the explosion-proof valve limits the pressure relief rate of the explosion-proof valve 50. Specifically, the pressure relief rate of the explosion-proof valve 50 is related to the diameter of its own pressure relief channel, which in turn affects the overall size of the explosion-proof valve 50. Therefore, the overall size of the explosion-proof valve 50 is affected by the size of the through-hole 120. The larger the size of the through-hole 120, the larger the pressure relief channel can be, which can increase the gas flow rate during pressure relief by the explosion-proof valve 50, allowing the gas inside the battery to be discharged more quickly.

[0031] However, the structural strength of the battery is also extremely important for the safe operation of the battery cell assembly. When the battery is compressed, it is necessary to ensure that the casing 20 does not collapse and that the top cover 10 does not deform. The size of the terminal through hole 110 and the size of the explosion-proof valve through hole 120 cannot be arbitrarily set. Therefore, how to balance the performance parameter requirements and safety requirements of the battery cell assembly is a problem that must be considered when designing the top cover 10.

[0032] To address the aforementioned problems, this application makes the following improvements to the top cover 10. Specifically, along a plane perpendicular to the thickness direction of the top cover 10, the area of ​​each pole post through hole 110 is defined as A, the area of ​​the explosion-proof valve through hole 120 is defined as B, and the area of ​​the top cover 10 is defined as C. The ratio of A to C is 0.5%–5%, and the ratio of B to C is 1.5%–8%. The value of A is within a range of 21 mm. 2 ~3750mm 2 B ranges from 63mm. 2 ~6000mm 2 The value of C ranges from 4200 mm. 2 ~75000 mm 2 .

[0033] The top cover 10 can be a thin sheet metal structure. Optionally, the top cover 10 is made of aluminum. The top cover 10 is assembled to the housing 20 along its thickness direction. Specifically... Figure 2 In the figure, the thickness direction of the top cover 10 is perpendicular to the drawing surface. Along the thickness direction of the top cover 10, the top cover 10 includes an inner side and an outer side, wherein the inner side faces the interior of the housing 20, and the outer side faces the exterior of the housing 20. The pole post through-hole 110 and the explosion-proof valve through-hole 120 both extend along the thickness direction through the inner and outer sides. The areas of the inner and outer sides can be approximately equal.

[0034] In this embodiment, the plane perpendicular to the thickness direction of the top cover 10 is used as the projection plane. Specifically, the projection plane can be the plane containing either the inner or outer side surface. The area of ​​the pole post through-hole 110 can be the area of ​​its orthographic projection onto the projection plane. The area of ​​the explosion-proof valve through-hole 120 can be the area of ​​its orthographic projection onto the projection plane. The area of ​​the top cover 10 can be the smaller of the orthographic projection areas of its inner and outer side surfaces onto the projection plane.

[0035] In this application, the external dimensions of the top cover 10 are defined as C, which ranges from 4200 mm. 2 ~75000mm 2 To ensure structural strength, the ratio of A to C is 0.5%–5%, and the ratio of B to C is 1.5%–8%, resulting in a value for A ranging from 21 mm. 2 ~3750mm 2 B ranges from 63mm. 2 ~6000mm 2 .

[0036] For example, in specific settings, the value of C is set to a range of 4200mm. 2 ~15000mm 2, 15000mm 2 ~45000mm 2, 45000mm 2 ~75000mm 2, The value of A can be in the range of 21 mm. 2 ~450 mm 2 750mm 2 ~1350mm 2 2250mm 2 ~3750mm 2 The value of B can be in the range of 63mm. 2 ~225 mm 2 1200mm 2 ~1600 mm 2 675mm 2 ~6000mm 2 Optionally, the value of A can be 21 mm. 2 28.26mm 2 283mm 2 3750mm 2 The value of B could correspond to 63mm. 2 327mm 2 393mm 2 6000mm 2 The value of C could correspond to 4200mm. 2 5586mm2 7791mm 2 Or 12040 mm 2 75000mm 2 .

[0037] By maintaining the ratio of A to C within 0.5% to 5% and the ratio of B to C within 1.5% to 8%, not only is the structural strength of the top cover 10 guaranteed, but the diameter of the pressure relief channel within the explosion-proof valve 50 can also be increased, allowing the battery to depressurize more quickly and improving battery safety. Furthermore, the minimum overcurrent capacity of the positive terminal 30 and the negative terminal 40 is ensured. Thus, both the performance parameter requirements and safety requirements of the battery cell assembly are met.

[0038] It should be noted that the top cover 10 can be any shape, and no limitation is made here.

[0039] In some embodiments, the top cover 10 is a rectangular plate, which includes two long sides 101 and two short sides 102. The length of the long side 101 is L and the length of the short side 102 is H.

[0040] Specifically, the inner and outer surfaces of the top cover 10 can be roughly rectangular. The four apex corners of the top cover 10 can be right angles or rounded corners, which are not limited here.

[0041] The two long sides 101 are arranged opposite each other, and the two short sides 102 are arranged opposite each other. The length direction of the top cover 10 is the extension direction of the long side 101, and the width direction of the top cover 10 is the extension direction of the short side 102. In this embodiment, the rectangular plate can be used for square batteries.

[0042] In some embodiments, the minimum distance between the explosion-proof valve through-hole 120 and the short side 102 along the length of the top cover 10 is L1, the ratio of L1 to L is 30% to 50%, the value of L ranges from 140mm to 500mm, and the value of L1 ranges from 42mm to 250mm. For example, the value of L ranges from 140mm to 200mm, or from 200mm to 500mm. The value of L1 ranges from 42mm to 100mm, or from 100mm to 150mm, or from 150mm to 250mm.

[0043] Optionally, the value of L can be 140mm, 159mm, 220mm, 400mm, or 500mm. The value of L1 can be 42mm, 71.5mm, 95mm, 195mm, or 250mm.

[0044] In some embodiments, the shortest distance between the explosion-proof valve through-hole 120 and the long side 101 in the width direction of the top cover 10 is H1, where the ratio of H1 to H is 15% to 50%, H ranges from 30mm to 150mm, and H1 ranges from 4.5mm to 75mm. For example, H may range from 30mm to 50mm, or 50mm to 80mm, or 80mm to 150mm. H1 may range from 4.5mm to 18mm, or 20mm to 50mm, or 50mm to 75mm.

[0045] Optionally, the value of H can be: 30mm, 40mm, 70mm, 109mm, 120mm, 150mm. The corresponding values ​​of H1 can be: 4.5mm; 10.5mm; 21mm, 52mm, 56mm, 75mm. Whether the explosion-proof valve 50 is too close to the long side 101 or the short side 102, it is detrimental to the installation of the explosion-proof valve 50 and may also affect the strength of the edge area of ​​the top cover 10, thus affecting the structural strength of the top cover 10.

[0046] Therefore, the ratio of the minimum distance L1 between the explosion-proof valve through-hole 120 and the short side 102 to the length L of the long side 101 is 30% to 50%. This ensures sufficient distance between the explosion-proof valve through-hole 120 and the short side 102, allowing this space to also be used for the pole through-hole 110. The ratio of the minimum distance H1 between the explosion-proof valve through-hole 120 and the long side 101 to the length H of the short side 102 is 15% to 50%. This ensures that the explosion-proof valve through-hole 120 is not too close to the long side 101 when the short side 102 is relatively small.

[0047] In some embodiments, the minimum distance between the through hole 110 and the short side 102 is L2, the ratio of L2 to L is 5% to 25%, L ranges from 140mm to 500mm, and L2 ranges from 7mm to 125mm. For example, L ranges from 140mm to 200mm, or 200mm to 500mm. L2 ranges from 7mm to 30mm, or 40mm to 75mm, or 80mm to 125mm.

[0048] Optionally, the value of L can be 140mm, 159mm, 220mm, 400mm, or 500mm. The corresponding values ​​for L2 can be 7mm, 21.5mm, 35mm, 89mm, or 125mm.

[0049] In some embodiments, the shortest distance between the through-hole 110 and the long side 101 is H2, where the ratio of H2 to H is 12% to 50%, H ranges from 30mm to 150mm, and H2 ranges from 3.6mm to 75mm. For example, H may range from 30mm to 50mm, or 50mm to 80mm, or 80mm to 150mm. H2 may range from 3.6mm to 20mm, or 30mm to 45mm, or 45mm to 75mm.

[0050] Optionally, the value of H can be: 30mm, 40mm, 70mm, 109mm, 120mm, 150mm. The corresponding values ​​of H2 can be: 3.6mm; 11mm; 15mm, 48.5mm, 55mm; 75mm. The minimum distance between the electrode through hole 110 and the long side 101 and the short side 102 is set within the above range to ensure that the electrode through hole 110 is not too close to the long side 101 or the short side 102.

[0051] In some embodiments, such as Figure 2 As shown, the explosion-proof valve through-hole 120 includes two straight edges 121 and two arc-shaped edges 122, where L:H < 3:1. The two straight edges 121 are spaced apart along the length of the top cover 10, and the extension direction of the straight edges 121 is the length direction of the explosion-proof valve through-hole 120. When the explosion-proof valve through-hole 120 includes two straight edges 121 and two arc-shaped edges 122, the explosion-proof valve through-hole 120 is approximately oblong. The extension direction of the straight edges 121 is the length direction of the explosion-proof valve through-hole 120.

[0052] When the two straight edges 121 are spaced apart in the width direction of the top cover 10, the straight edge 121 of the explosion-proof valve through hole 120 is parallel to the short side 102 of the top cover 10.

[0053] When L:H < 3:1, the difference between the length dimension and the width dimension of the top cover 10 is relatively small. Therefore, the straight side 121 of the explosion-proof valve through-hole 120 is set parallel to the short side 102 of the top cover 10. This allows the explosion-proof valve through-hole 120 to utilize more space in the width direction of the top cover 10, freeing up more space for the pole through-hole 110 in the length direction.

[0054] The possible values ​​for L:H are 2.45, 2.5, 2.68, and 2.83.

[0055] In some embodiments, such as Figure 3 As shown, the explosion-proof valve through hole 120 includes two straight edges 121 and two arc-shaped edges 122, wherein L:H≥3:1, the two straight edges 121 are spaced apart in the width direction of the top cover 10, and the extension direction of the straight edges 121 is the length direction of the explosion-proof valve through hole 120.

[0056] When the two straight edges 121 are spaced apart in the width direction of the top cover 10, the straight edge 121 of the explosion-proof valve through hole 120 is parallel to the long edge 101 of the top cover 10.

[0057] When L:H ≥ 3:1, the length dimension of the top cover 10 is much larger than its width dimension, resulting in a larger space along its length. Therefore, the straight side 121 of the explosion-proof valve through-hole 120 is set parallel to the long side 101 of the top cover 10. This ensures that the longitudinal direction of the explosion-proof valve through-hole 120 is along the length of the top cover 10, allowing it to fully utilize the space along the length of the top cover 10, minimizing its impact on the structural strength of the top cover 10, and also ensuring a coordinated arrangement of the through-holes on the top cover 10.

[0058] Optionally, the values ​​for L:H are 3.19, 3.61, 3.77, and 3.86.

[0059] In some embodiments, such as Figure 4 As shown, in the length direction of the top cover 10, the explosion-proof valve through hole 120 is located between the two pole through holes 110, and the two pole through holes 110 are asymmetrically arranged with respect to the explosion-proof valve through hole 120.

[0060] In the prior art, the two pole through holes 110 are usually symmetrically arranged about the explosion-proof valve through hole 120, which makes the positions of the two pole through holes 110 and the explosion-proof valve through hole 120 relatively limited, resulting in insufficient design flexibility.

[0061] In this application, while satisfying the aforementioned dimensional relationship, the two pole through holes 110 do not need to be symmetrically arranged with respect to the explosion-proof valve through hole 120, which can still ensure the structural strength of the top cover 10, thus providing more options for the design of the top cover 10.

[0062] Specifically, in this embodiment, as shown in the figure, the explosion-proof valve through hole 120 is centrally located along the length of the top cover 10. Figure 4 The distance between the pole post through hole 110 on the left side and the explosion-proof valve through hole 120 is slightly closer; Figure 4 The distance between the pole through hole 110 on the right side and the explosion-proof valve through hole 120 is slightly far.

[0063] In some embodiments, such as Figure 5 As shown, the explosion-proof valve through-hole 120 is not centrally located along the length of the top cover 10. Specifically, Figure 5 In the middle, along the length of the top cover 10, the explosion-proof valve through hole 120 is relatively close to the left end of the top cover and relatively far away from the right end of the top cover 10.

[0064] Furthermore, based on the non-centered setting of the explosion-proof valve through hole 120, the two pole through holes 110 can be symmetrically set about the explosion-proof valve through hole 120; or they can be asymmetrically set about the explosion-proof valve through hole 120.

[0065] In this application, while satisfying the aforementioned dimensional relationship, the explosion-proof valve through hole 120 can be set non-centrally, while still ensuring the structural strength of the top cover 10, thus providing more options for the design of the top cover 10.

[0066] Technical Effect Examples

[0067] To strongly support the beneficial effects of this application, further experimental data are provided in Table 1 below.

[0068] Table 1

[0069]

[0070] As shown in Table 1, 12 types of top covers were designed according to the scheme of this application. The area unit in the table is mm. 2 The length dimension is in mm. Among the 12 types of top covers (10 in total), the ratio of A to C is between 0.5% and 5%, and the ratio of B to C is between 1.5% and 8%; and the value of A ranges from 21 mm. 2 ~3750mm 2 B ranges from 63mm. 2 ~6000mm 2 The value of C ranges from 4200 mm. 2 ~75000mm 2 .

[0071] In addition, in preparing the top caps of Comparative Examples 1 and 2, the ratio of A to C was not within 0.5% to 5%, and the ratio of B to C was within 1.5% to 8%.

[0072] Strength tests were conducted on the 12 types of top covers in this embodiment and the two types of top covers in Comparative Examples 1 and 2, respectively. Performance tests were also conducted on the 12 types of batteries using these 12 types of top covers and the batteries using the top covers in Comparative Examples 1 and 2. The test results show that:

[0073] (1) Under a pressure of 1 MPa, each top cover 10 was subjected to a compression test, and the deformation was less than 1 mm, so the compression test was passed. However, when the top covers of proportions 1 and 2 were subjected to compression tests, the deformation was 1.5 mm and 1.6 mm, respectively, and the deformation was greater than 1 mm.

[0074] (2) Test the overcurrent capability of positive terminal 30 and negative terminal 40. Taking copper as an example, the overcurrent is ≤8A / mm. 2 That is, the maximum overcurrent can be up to 8A / mm. 2 This meets the design requirements. In Comparative Examples 1 and 2, the overcurrent capacity of the compatible positive and negative terminals is greater than 8A / mm², respectively. 2 .

[0075] (3) Thermal runaway tests were conducted on each battery. All batteries passed the thermal runaway test, indicating that the size of the explosion-proof valve through-hole 120 is reasonable. In Comparative Examples 1 and 2, the thermal runaway test was not passed. The battery casings of Comparative Examples 1 and 2 showed varying degrees of cracking and deformation.

[0076] The comparative analysis above shows that while the comparative method achieves better current carrying capacity at the terminals, it fails to meet battery safety requirements. In contrast, the top cover design of this embodiment balances both the performance parameters of the battery cell and battery safety.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery, comprising a top cover, characterized in that, The top cover is provided with two through holes for pole posts and an explosion-proof valve through hole that are arranged through the thickness direction of the top cover. Along a plane perpendicular to the thickness direction of the top cover, the area of ​​each pole post through hole is A, the area of ​​the explosion-proof valve through hole is B, and the area of ​​the top cover is C, wherein the ratio of A to C is 0.5% to 5%, and the ratio of B to C is 1.5% to 8%; Wherein, the value of A ranges from 21 mm. 2 ~3750mm 2 B ranges from 63mm. 2 ~6000mm 2 The value of C ranges from 4200 mm. 2 ~75000mm 2 .

2. The battery according to claim 1, characterized in that, The top cover is a rectangular plate, which includes two long sides and two short sides. The length of the long side is L and the length of the short side is H.

3. The battery according to claim 2, characterized in that, Along the length of the top cover, the minimum distance between the explosion-proof valve through hole and the short side is L1, the ratio of L1 to L is 30% to 50%, the value of L ranges from 140mm to 500mm, and the value of L1 ranges from 42mm to 250mm.

4. The battery according to claim 2, characterized in that, The minimum distance between the through hole of the pole post and the short side is L2, the ratio of L2 to L is 5% to 25%, the value of L is in the range of 140mm to 500mm, and the value of L2 is in the range of 7mm to 125mm.

5. The battery according to claim 2, characterized in that, In the width direction of the top cover, the shortest distance between the explosion-proof valve through hole and the long side is H1, the ratio of H1 to H is 15% to 50%, the value of H is 30mm to 150mm, and the value of H1 is 4.5mm to 75mm.

6. The battery according to claim 2, characterized in that, The shortest distance between the through hole of the pole post and the long side is H2, the ratio of H2 to H is 12% to 50%, the value of H is 30mm to 150mm, and the value of H2 is 3.6mm to 75mm.

7. The battery according to claim 2, characterized in that, The explosion-proof valve through hole includes two straight sides and two arc-shaped sides, where L:H < 3:

1. The two straight sides are spaced apart along the length of the top cover, and the straight sides extend along the length of the explosion-proof valve through hole. The straight sides are parallel to the short side of the top cover.

8. The battery according to claim 2, characterized in that, The explosion-proof valve through hole includes two straight sides and two arc-shaped sides, wherein L:H≥3:1, the two straight sides are spaced apart in the width direction of the top cover, the extension direction of the straight sides is the length direction of the explosion-proof valve through hole, and the straight sides are parallel to the long side of the top cover.

9. The battery according to claim 2, characterized in that, Along the length of the top cover, the explosion-proof valve through hole is located between the two pole through holes, and the two pole through holes are asymmetrically arranged with respect to the explosion-proof valve through hole.

10. The battery according to claim 2, characterized in that, The explosion-proof valve through-hole is not centrally located along the length of the top cover.

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