Anti-explosion structure, battery, and battery pack

Abstract

Disclosed in the present application are an anti-explosion structure, a battery, and a battery pack. The anti-explosion structure comprises a cover plate and an anti-explosion recess; the anti-explosion recess comprises a first sub-recess and a second sub-recess, the thickness of the cover plate at the location of the first sub-recess is H1, and the thickness of the cover plate at the location of the second sub-recess is H2, where H1 < H2; wherein at a first pressure, the cover plate at the first sub-recess opens, and at a second pressure, the cover plate at the second sub-recess opens, the first pressure being P1, where 0.5 Mpa < P1 < 1.5 Mpa, and the second pressure being P2, where 1.5 Mpa ≤ P2 < 2.5 Mpa.

Description

Explosion-proof structure, batteries and battery packs Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to an explosion-proof structure, a battery, and a battery pack. Background Art

[0002] During use, power batteries may experience internal pressure buildup due to short circuits or other factors, exceeding safety limits and potentially causing explosions. To minimize these risks, an explosion-proof diaphragm is typically installed on the battery cover. This diaphragm gradually deforms as internal pressure increases until it opens.

[0003] During the thermal runaway of the battery, when the battery temperature rises to a certain stage, the internal electrolyte will decompose into combustible gases such as methane. As the battery temperature continues to rise, combustion-supporting gases such as oxygen will also decompose inside the battery. When the internal pressure of the battery increases further, the explosion-proof diaphragm will burst. At the moment the explosion-proof valve bursts, the combustible gas, combustion-supporting gas and substances in the battery interact with each other, aggravating the degree of thermal runaway and easily causing the battery to explode. Technical issues

[0004] The embodiments of the present application provide an explosion-proof structure, a battery, and a battery pack to solve the problem that when the explosion-proof structure of the related art is opened, the combustible gas, the combustion-supporting gas, and the substances in the battery interact, aggravating the degree of thermal runaway and causing battery explosion. Technical Solutions

[0005] In a first aspect, an embodiment of the present application provides an explosion-proof structure applied to a battery, comprising:

[0006] cover;

[0007] An explosion-proof groove is arranged on the cover plate, and the explosion-proof groove includes a first sub-groove and a second sub-groove. The thickness of the cover plate at the position of the first sub-groove is H1, and the thickness of the cover plate at the position of the second sub-groove is H2, H1<H2, wherein, under a first pressure, the cover plate at the first sub-groove is opened, and under a second pressure, the cover plate at the second sub-groove is opened, the first pressure is P1, 0.5Mpa<P1<1.5Mpa, and the second pressure is P2, 1.5Mpa≤P2<2.5Mpa.

[0008] In a second aspect, an embodiment of the present application further provides a battery, comprising:

[0009] The explosion-proof structure as described above;

[0010] Roll core;

[0011] The shell is provided with an opening at one end of the shell, and the cover is sealed with the shell to block the opening.

[0012] In a third aspect, an embodiment of the present application further provides a battery pack comprising the battery as described above. Beneficial effects

[0013] The beneficial effects of the present application are as follows: the explosion-proof structure, cover plate assembly and battery provided by the embodiment of the present application, by arranging a first sub-groove and a second sub-groove on the cover plate, the thickness of the cover plate at the position of the first sub-groove is less than the thickness of the cover plate at the position of the second sub-groove, when the internal pressure of the battery increases, the position of the first sub-groove on the cover plate is opened first, and the position of the second sub-groove on the cover plate is opened again, forming a secondary pressure relief of the battery, the first opening can discharge the combustible gas, and the second opening can discharge the combustion-supporting gas, thereby achieving the purpose of time-sharing discharge of the combustible gas and the combustion-supporting gas, the minimum value of the first pressure P1 is greater than 0.5Mpa and the maximum value is less than 1.5Mpa, which is a reasonable design, and can achieve the combustible gas decomposed by the electrolyte to be discharged first, avoiding the situation where the battery is opened during normal operation, the minimum value of the second pressure P2 is 1.5Mpa and the maximum value is less than 2.5Mpa, avoiding the situation where the battery explodes, overcoming the problem that when the explosion-proof structure of the related technology is opened, the combustible gas, the combustion-supporting gas and the substances in the battery interact, aggravating the degree of thermal runaway and causing battery explosion, and having the advantages of simple structure and good explosion-proof characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a top view of a first form of explosion-proof structure provided in an embodiment of the present application.

[0015] FIG2 is a top view of a first form based on the form 1 of the explosion-proof structure provided in an embodiment of the present application.

[0016] FIG3 is a top view of a second form of the explosion-proof structure based on the first form provided in an embodiment of the present application.

[0017] FIG4 is a cross-sectional view taken along line AA in FIG3 .

[0018] FIG5 is a partial enlarged view of point B in FIG3 .

[0019] FIG6 is a CC cross-sectional view in FIG5 .

[0020] FIG7 is a partial enlarged view of point D in FIG6 .

[0021] FIG8 is a cross-sectional view taken along line EE in FIG5 .

[0022] FIG9 is a marked diagram of the explosion-proof structure provided in an embodiment of the present application.

[0023] FIG10 is a three-dimensional diagram of the explosion-proof structure provided in an embodiment of the present application.

[0024] FIG11 is a top view of a third form of the explosion-proof structure based on the first form provided in an embodiment of the present application.

[0025] FIG12 is a top view of a fourth form of the explosion-proof structure based on the first form provided in an embodiment of the present application.

[0026] FIG13 is a top view of a fifth form based on the first form of the explosion-proof structure provided in an embodiment of the present application.

[0027] FIG14 is a top view of the second form of the explosion-proof structure provided in an embodiment of the present application.

[0028] FIG15 is a cross-sectional view taken along line II in FIG14 .

[0029] FIG16 is a partial enlarged view of point F in FIG14 .

[0030] FIG17 is a partial enlarged view of point G in FIG15 .

[0031] FIG18 is a top view of the explosion-proof groove provided in an embodiment of the present application, which is arranged on the second sub-section.

[0032] FIG19 is a cross-sectional view of KK in FIG18 .

[0033] FIG20 is a marked diagram of the first sub-groove of the explosion-proof structure provided in an embodiment of the present application.

[0034] Figure 21 is a top view of form 4 of the explosion-proof structure provided in an embodiment of the present application.

[0035] Figure 22 is a sectional view taken along line LL in Figure 21.

[0036] FIG23 is a labeled view of FIG21 .

[0037] FIG24 is a three-dimensional diagram of a battery provided in an embodiment of the present application.

[0038] FIG25 is a top view of FIG24 .

[0039] FIG26 is a cross-sectional view of GG in FIG25 .

[0040] FIG27 is a partial enlarged view of point H in FIG26 .

[0041] FIG28 is a partial enlarged view of point M in FIG26 .

[0042] Figure 29 is a partial three-dimensional view of the battery pack provided in an embodiment of the present application.

[0043] FIG30 is a side view of FIG29.

[0044] FIG31 is a cross-sectional view taken along line HH in FIG30 .

[0045] Description of reference numerals:

[0046] 100, battery; 110, cover; 111, first side; 1111, first section; 1112, second section; 1113, first end; 1114, second end; 1115, third end; 1116, fourth end; 1117, third section; 112, second side; 1121, fifth end; 1122, sixth end; 113, first subsection; 114, second subsection; 1141, sink; 1142, boss; 115, third subsection; 116, fourth subsection; 1 20. Explosion-proof groove; 121. First sub-groove; 1211. First groove wall; 1212. Second groove wall; 122. Second sub-groove; 130. Mounting seat; 131. Mounting groove; 132. Baffle; 133. First sub-plate; 134. Second sub-plate; 140. Winding core; 150. Shell; 151. Opening; 152. Positive terminal; 153. Flange; 154. Press plate; 155. Seal; 160. First collecting plate; 170. Second collecting plate; 180. Insulator. Modes for Carrying Out the Invention

[0047] The present invention provides an explosion-proof structure, battery, and battery pack to address the problem of battery explosion caused by the interaction between combustible gases, combustion-supporting gases, and materials within the battery when the explosion-proof structure explodes. This will be described below with reference to the accompanying drawings.

[0048] Referring to Figures 1, 2, 3, 14, 18 and 21, an explosion-proof structure provided in an embodiment of the present application is applied to a battery, which can be a cylindrical battery. The explosion-proof structure includes a cover plate 110 and an explosion-proof groove 120. The cover plate 110 has a disc-shaped structure. The material of the cover plate 110 can be steel, such as SPCC material, stainless steel material SUS410, SUS306, SUS316, SUS430, SUS444 and other materials. When SPCC material is used, nickel can be plated on both sides of the cover plate 110, and the thickness of the coating is 0.3μm to 8μm. The coating thickness on both sides of the cover plate 110 may be the same or different. An explosion-proof groove 120 is integrally provided on the cover plate 110, and the explosion-proof groove 120 includes a first sub-groove 121 and a second sub-groove 122. The thickness of the cover plate 110 at the position of the first sub-groove 121 is H1, and the thickness of the cover plate at the position of the second sub-groove 122 is H2, H1<H2. Under the first pressure, the cover plate 110 at the first sub-groove 121 is opened, and under the second pressure, the cover plate 110 at the second sub-groove 122 is opened. The first pressure is P1, 0.5Mpa<P1<1.5Mpa, and the second pressure is P2, 1.5Mpa≤P2<2.5Mpa.

[0049] Under normal operating conditions, the internal pressure of the battery will reach 0.5Mpa. Generally, before the battery triggers thermal runaway, the internal pressure increases with the increase of temperature and decomposition of the electrolyte. In order to allow the combustible gas decomposed by the electrolyte to be discharged first and not cause the battery to open under normal operation, the first pressure P1 is set between (0.5Mpa, 1.5Mpa), such as P1 is set to 0.6Mpa, 0.7Mpa, 0.8Mpa, 0.9Mpa, 1.0Mpa, 1.1Mpa, 1.2Mpa, 1.3Mpa, 1.4Mpa or other unlisted values. At the end of the battery thermal runaway, the internal pressure of the battery rises to a certain level, and the explosion-proof valve needs to open and release the burning substances inside the battery to avoid battery explosion. The second pressure P2 is set between [1.5Mpa, 2.5Mpa), such as P2 is set to 1.6Mpa, 1.7Mpa, 1.8Mpa, 1.9Mpa, 2.0Mpa, 2.1Mpa, 2.2Mpa, 2.3Mpa, 2.4Mpa or other unspecified values.

[0050] Since the thickness of the cover plate 110 at the position of the first sub-groove 121 is less than the thickness of the cover plate 110 at the position of the second sub-groove 122, as the air pressure inside the battery increases, the position of the first sub-groove 121 on the cover plate 110 is opened first, and then the position of the second sub-groove 122 on the cover plate 110 is opened. Under the first pressure, the cover plate 110 at the first sub-groove 121 is opened, and the first sub-groove 121 is opened to discharge combustible substances. Under the second pressure, the cover plate 110 at the second sub-groove 122 is opened, and the second sub-groove 122 is opened to discharge combustion-supporting substances. The first pressure is less than the second pressure, and the first pressure and the second pressure are reasonably set. While ensuring the normal operation of the battery, the secondary pressure relief of the battery is achieved. The first opening can discharge the combustible gas, and the second opening can discharge the combustion-supporting gas, thereby achieving the purpose of time-sharing discharge of the combustible gas and the combustion-supporting gas, overcoming the problem that when the explosion-proof structure of the related technology is opened, the combustible gas, the combustion-supporting gas and the substances in the battery interact with each other, aggravating the degree of thermal runaway and causing battery explosion.

[0051] The above-mentioned explosion-proof structure has various forms, which are described in detail below with reference to the accompanying drawings.

[0052] Form 1: As shown in Figure 1, the cover plate 110 includes a first side surface 111 and a second side surface 112 arranged opposite to each other, and the first sub-groove 121 and the second sub-groove 122 are both arranged on the first side surface 111. The first sub-groove 121 and the second sub-groove 122 are arranged on the first side surface 111 of the cover plate 110 to facilitate the processing of the first sub-groove 121 and the second sub-groove 122. The first sub-groove 121 and the second sub-groove 122 are connected, and the first sub-groove 121 and the second sub-groove 122 form a closed ring on one side of the cover plate 110. The projections of the first sub-groove 121 and the second sub-groove 122 on one side of the cover plate 110 form a closed ring, which ensures the pressure relief area. While, after the cover plate 110 at the position of the first sub-groove 121 is opened, the cover plate 110 at the position of the second sub-groove 122 is broken through from the connection between the first sub-groove 121 and the second sub-groove 122, which is conducive to the opening of the cover plate 110 at the position of the second sub-groove 122, ensuring that the explosion-proof structure can be opened smoothly, and part of the cover plate 110 on the inner side of the first sub-groove 121 and the second sub-groove 122 and part of the cover plate 110 on the outer side of the first sub-groove 121 and the second sub-groove 122 are completely detached, realizing the complete opening of the explosion-proof structure and ensuring the explosion-proof effect.

[0053] Form 2: As shown in Figures 14 and 16, along the radial direction of the cover plate 110, the second sub-groove 122 is annular, and the first sub-groove 121 is spaced apart from the second sub-groove 122. The first sub-groove 121 includes a first section 1111 and a second section 1112. The first section 1111 has a first end 1113 and a second end 1114, and the second section 1112 has a third end 1115 and a fourth end 1116. The distance between the first end 1113 and the third end 1115 is greater than the distance between the second end 1114 and the fourth end 1116. The first sub-groove 121 is closer to the center of the cover plate 110 than the second sub-groove 122. When the second sub-groove 122 opens under the second pressure P2, the cover plate 110 inside the second sub-groove 122 is completely separated from the cover plate 110 outside the second sub-groove 122. The opening for secondary pressure relief is sufficiently large to ensure effective pressure relief and prevent battery explosion.

[0054] Form three: As shown in Figure 21, the second sub-groove 122 is arc-shaped, the second sub-groove 122 includes a fifth end 1121 and a sixth end 1122, the first sub-groove 121 is located between the fifth end 1121 and the sixth end 1122, the first sub-groove 121 includes a first section 1111 and a second section 1112, the first section 1111 has a first end 1113 and a second end 1114, the second section 1112 has a third end 1115 and a fourth end 1116, and the distance between the first end 1113 and the third end 1115 is greater than the distance between the second end 1114 and the fourth end 1116.

[0055] Form 4, based on Form 3, as shown in FIG21 , the first sub-groove 121 is connected to the second sub-groove 122, the first end 1113 is connected to the fifth end 1121, and the third end 1115 is connected to the sixth end 1122. The first sub-groove 121 and the second sub-groove 122 are connected to form a closed shape. Under a first pressure, the first sub-groove 121 opens. Under a second pressure, the second sub-groove 122 opens from the first end 1113 and the third end 1115 of the first sub-groove 121, which facilitates the opening of the second sub-groove 122. Furthermore, the closed shape formed by the first and second sub-grooves 121 and 122 is larger. Under the second pressure, the cover plates 110 inside and outside the first and second sub-grooves 121 and 122 are completely separated, and the pressure relief opening is sufficiently large to ensure effective pressure relief and prevent battery blockage.

[0056] In some embodiments, the first segment 1111 and the second segment 1112 of the first sub-groove 121 are line segments, and a certain angle is formed between the first segment 1111 and the second segment 1112. When the first sub-groove 121 is opened, it is first opened from the connecting end of the first segment 1111 and the second segment 1112, and the first sub-groove 121 is fully opened along the direction in which the first segment 1111 and the second segment 1112 extend.

[0057] In some embodiments, as shown in FIG16 , the first section 1111 and the second section 1112 of the first sub-groove 121 are both arcs, and the length of the first sub-groove 121 is increased as much as possible, thereby increasing the size of the pressure relief port when the first sub-groove 121 is opened and ensuring a one-time pressure relief effect.

[0058] In some embodiments, as shown in FIG16 , the first sub-groove 121 further includes a third section 1117 disposed between the second end 1114 and the fourth end 1116 . The third section 1117 smoothly transitions between the first section 1111 and the second section 1112 , ensuring that the first sub-groove 121 can be opened smoothly.

[0059] In some embodiments, as shown in FIG16 , the first segment 1111, the second segment 1112, and the third segment 1117 are all arc-shaped, and the curvature of the first segment 1111 and the second segment 1112 is different from the curvature of the third segment 1117. This allows for a smooth transition between the first segment 1111 and the second segment 1112, maximizes the size of the primary pressure relief port, and ensures smooth opening of the primary pressure relief port.

[0060] In some embodiments, as shown in FIG. 20 , the chord corresponding to the arc of the first segment 1111 and the chord corresponding to the arc of the second segment 1112 form an angle β, where 30°≤β≤150°. For example, β can be 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, or other unspecified values. The chord corresponding to the arc of the first segment 1111 refers to the straight line on which the chord corresponding to the inner arc of the first segment 1111 lies, and the chord corresponding to the arc of the second segment 1112 refers to the straight line on which the chord corresponding to the inner arc of the second segment 1112 lies. The angles between the first segment 1111 and the second segment 1112 are reasonable. Within the span, a larger angle β corresponds to a longer length of the first sub-slot 121. A larger angle β also results in earlier opening of the cover plate 110 at the first sub-slot 121. The angle β can be set as needed.

[0061] In some embodiments, as shown in FIG. 20 , the arc length of the first segment 1111 is L1, the arc length of the second segment 1112 is L2, and the arc length of the third segment 1117 is L3. 4mm≤L1=L2≤8mm, and 1mm≤L3≤3mm. The first segment 1111 and the second segment 1112 are symmetrically arranged, 1mm≤L3≤3mm, wherein the value of L3 can be 1mm, 2mm, 3mm, or other unspecified values. 4mm≤L1=L2≤8mm, and the values ​​of L1 and L2 can be 4mm, 5mm, 6mm, 7mm, 8mm, or other unspecified values. The arc lengths of the first segment 1111, the second segment 1112, and the third segment 1117 are reasonably set. During pressure relief, the first segment 1111 and the second segment 1112 are symmetrically arranged, so that the two sides are subjected to the same force and have the same opening speed, thereby ensuring the reliability of a single pressure relief.

[0062] In some embodiments, as shown in FIG16 , the second end 1114 is closer to the center of the cover plate 110 than the first end 1113, and the fourth end 1116 is closer to the center of the cover plate 110 than the third end 1115. As a variation, the first end 1113 is closer to the center of the cover plate 110 than the second end 1114, and the third end 1115 is closer to the center of the cover plate 110 than the fourth end 1116. The protruding direction of the first sub-groove 121 can be appropriately arranged according to the actual size of the cover plate 110.

[0063] In some embodiments, the cross-sectional shape of the explosion-proof groove 120 along the thickness direction of the cover plate 110 is V-shaped, trapezoidal, semicircular, U-shaped, or parabolic. The cross-sectional shape of the first sub-groove 121 can be the same as the cross-sectional shape of the second sub-groove 122. The cross-sectional shape of the explosion-proof groove 120 can be appropriately set according to the processing technology.

[0064] In some embodiments, referring to Figures 1, 2, 3, 9, 18, and 23, when viewed from above the cover plate 110, the outer diameter of the circular ring where the second sub-groove 122 is located is E1, 24 mm ≤ E1 ≤ 40 mm, such as 30 mm ≤ E1 ≤ 35 mm. The value of E1 can be 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, or other unspecified values. The position of the second sub-groove 122 on the cover plate 110 is reasonably set to form a sufficiently large pressure relief area to ensure a pressure relief effect.

[0065] In some embodiments, as shown in Figures 6, 7, and 17, the thickness of the cover plate 110 at the first sub-groove 121 is H1, and the thickness of the cover plate 110 at the second sub-groove 122 is H2, where 20 μm ≤ H1 ≤ 115 μm, and 25 μm ≤ H2 ≤ 135 μm. For example, 45 μm ≤ H1 ≤ 55 μm, and 80 μm ≤ H2 ≤ 100 μm. The value of H1 can be 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 115 μm, or other unspecified values. The value of H2 can be 25μm, 35μm, 45μm, 55μm, 65μm, 75μm, 85μm, 95μm, 105μm, 115μm, 125μm, 135μm or other unlisted values.

[0066] It is understandable that the thicker the cover plate 110 at the location of the explosion-proof groove 120, the greater the pressure required to open the explosion-proof groove 120. The thickness of the cover plate 110 at the location of the explosion-proof groove 120 is positively correlated with the pressure required to open the explosion-proof groove 120. If the thickness of the cover plate 110 at the location of the explosion-proof groove 120 is thin, the explosion-proof groove 120 may be opened within the normal operating range of the battery, affecting the performance of the battery. If the thickness of the cover plate 110 at the location of the explosion-proof groove 120 is thick, the pressure required to open the explosion-proof groove 120 is large, and the battery is prone to explosion. In the embodiment of the present application, the thickness range of the cover plate 110 where the explosion-proof groove 120 is located is reasonably designed to ensure the normal operation of the battery while achieving secondary pressure relief and preventing battery explosion.

[0067] In some embodiments, 5 μm ≤ H2 - H1 ≤ 20 μm. The value of H2 - H1 can be 5 μm, 10 μm, 15 μm, 20 μm, or other unspecified values. The difference between H2 and H1 is set within a reasonable range to ensure the reliability of the primary and secondary pressure relief.

[0068] In some embodiments, as shown in Figures 7, 8, and 17, the thickness of the area outside the explosion-proof groove 120 on the cover plate 110 is C, where 0.4 mm ≤ C ≤ 1.0 mm. The value of C can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, or other unspecified values. Properly setting the thickness of the cover plate 110 ensures the strength of the cover plate 110 while allowing the first sub-groove 121 and the second sub-groove 122 to be formed, achieving two-stage pressure relief.

[0069] In some embodiments, based on form one, as shown in Figure 3, the arc length of the first sub-groove 121 is smaller than the arc length of the second sub-groove 122, wherein the arc length of the first sub-groove 121 refers to the length of the arc of the outer edge of the explosion-proof groove 120 where the first sub-groove 121 is located, and the arc length of the second sub-groove 122 refers to the length of the arc of the outer edge of the explosion-proof groove 120 where the second sub-groove 122 is located.

[0070] In some embodiments, based on form 1, as shown in FIG3 , the ratio of the arc length of the first sub-groove 121 to the arc length of the second sub-groove 122 is G, where: The value of G can be The arc lengths of the first sub-groove 121 and the second sub-groove 122 are reasonably arranged, and the opening sizes of the first and second pressure relief openings are reasonably arranged to ensure explosion-proof effect.

[0071] In some embodiments, as shown in Figures 8 and 17, the width of the notch of the explosion-proof groove 120 is a, 0.6mm≤a≤1.5mm. The value of a can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or other unspecified values. The notch width of the explosion-proof groove 120 is appropriately set to avoid a notch width that is too small, making it difficult to process and open, and a notch width that is too large, which would increase the area of ​​the explosion-proof groove 120 and affect the structural strength of the cover plate 110.

[0072] In some embodiments, as shown in Figures 1 and 14 , in the structures of Forms 2 and 4, the outer diameter of the annular ring in which the second sub-groove 122 is located is E1, and 24 mm ≤ E1 ≤ 40 mm, such as 30 mm ≤ E1 ≤ 35 mm. The value of E1 can be 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, or other unspecified values. The explosion-proof groove 120 is appropriately positioned on the cover plate 110 to form a sufficiently large pressure relief area to ensure a pressure relief effect.

[0073] In some embodiments, referring to Figures 11 and 13, based on form one, the explosion-proof groove 120 includes a plurality of first sub-grooves 121 and a plurality of second sub-grooves 122, the first sub-grooves 121 and the second sub-grooves 122 are alternately arranged, the plurality of first sub-grooves 121 and the plurality of second sub-grooves 122 are located on the same circle, and the projections of the plurality of first sub-grooves 121 and the plurality of second sub-grooves 122 on one side of the cover plate 110 form a closed circular ring.

[0074] It can be understood that in order to achieve secondary pressure relief, under the first pressure, all the cover plates 110 at the positions of the first sub-grooves 121 are opened, and under the second pressure, all the cover plates 110 at the positions of the second sub-grooves 122 are opened. The first pressure is lower than the second pressure. By arranging multiple first sub-grooves 121 and multiple second sub-grooves 122 on the cover plate 110, it is beneficial for the cover plate 110 at the position of the explosion-proof groove 120 to be fully opened, thereby ensuring the pressure relief area and guaranteeing the pressure relief effect.

[0075] In some embodiments, referring to Figures 2 and 18, the cover 110 includes a first sub-portion 113 and a second sub-portion 114, the first sub-portion 113 and the second sub-portion 114 are adjacent to each other, the first sub-portion 113 is close to the edge of the cover 110, at least a portion of the surface of the second sub-portion 114 facing the core 140 is higher than the surface of the first sub-portion 113 facing the core 140, at least a portion of the surface of the second sub-portion 114 away from the core 140 is higher than the surface of the first sub-portion 113 away from the core 140, and the explosion-proof groove 120 is arranged on the second sub-portion 114.

[0076] It can be understood that the cover plate 110 is designed to have a concave-convex structure. When the cover plate 110 is deformed, it becomes a hemispherical or hat-shaped structure, which increases the space between the cover plate 110 and the end of the winding core 140, preventing the air pressure in the battery from increasing sharply and causing the battery to explode.

[0077] On the basis of the above embodiment, referring to Figures 2 and 18, the cover 110 includes a third sub-section 115. Along the radial direction of the cover 110, the first sub-section 113, the second sub-section 114 and the third sub-section 115 are concentrically arranged in sequence. The first sub-section 113 and the second sub-section 114 are annular, and the third sub-section 115 is circular. The first sub-section 113 is close to the edge of the cover 110 and points from the second side 112 to the first side 111. The surface of the second sub-section 114 facing the core 140 is at least partially higher than the surface of the first sub-section 113 facing the core 140. The surface of the second sub-section 114 away from the core 140 is at least partially higher than the surface of the first sub-section 113 away from the core 140. The explosion-proof groove 120 is arranged on the second sub-section 114, and the first sub-groove 121 and the second sub-groove 122 are concentrically arranged with the second sub-section 114.

[0078] It can be understood that when the air pressure in the battery increases, the cover 110 bulges and deforms in the direction of the first side surface 111, and the heights of the second sub-section 114 and the third sub-section 115 are designed to be higher than the height of the first sub-section 113. After deformation, the cover 110 becomes hemispherical or hat-shaped, which increases the space between the cover 110 and the end of the core 140, preventing the air pressure in the battery from increasing sharply and causing the battery to explode.

[0079] In some embodiments, as shown in Figures 2 and 18, the cover plate 110 also includes a fourth sub-portion 116. The fourth sub-portion 116 is annular and is located between the second sub-portion 114 and the third sub-portion 115. The fourth sub-portion 116 connects the second sub-portion 114 and the third sub-portion 115.

[0080] It can be understood that the explosion-proof groove 120 is set on the second sub-section 114. During the deformation of the cover 110, the deformation force of the first sub-section 113 and the fourth sub-section 116 acts on the explosion-proof groove 120, which is conducive to the smooth opening of the explosion-proof groove 120 and the reliability of the explosion-proof structure.

[0081] In other embodiments, it is also designed that the height of the third sub-section 115 on the first side 111 is higher than the height of the second sub-section 114, the height of the second sub-section 114 is partially higher than the height of the first sub-section 113, and the first sub-section 113 is higher than the fourth sub-section 116; on the second side 112, the fourth sub-section 116 is lower than the first sub-section 113, the first sub-section 113 is lower than at least part of the second sub-section 114, and the second sub-section 114 is lower than the third sub-section 115.

[0082] It can be understood that when the cover plate 110 is installed on the battery for use, the fourth sub-portion 116 of the cover plate 110 is connected to the electrode of the battery, and the cover plate 110 is charged. For the battery, the electric potential between the cover plate 110 and the battery shell 150 is the same, and there is no potential difference, which reduces the risk of corrosion of the cover plate 110 and improves the reliability of the battery pack.

[0083] In some embodiments, referring to FIG8 and FIG19 , the distance between the first side surface 111 of the second sub-section 114 and the first side surface 111 of the first sub-section 113 is B, 0.8C≤B≤1.5C, wherein C is the thickness of the area outside the explosion-proof groove 120 on the cover plate 110, such as, B is 0.8C, 0.9C, 1.0C, 1.1C, 1.2C, 1.3C, 1.4C, 1.5C or other unspecified values.

[0084] In some embodiments, referring to FIG9 , in the structure of form one, the outer diameter of the circular ring where the second sub-groove 122 is located is E1, the inner diameter of the second sub-portion 114 is E2, the outer diameter of the second sub-portion 114 is E3, and the diameter of the cover plate 110 is E4, wherein 42 mm ≤ E4 ≤ 46 mm, such as, E4 is 42 mm, 43 mm, 44 mm, 45 mm, 46 mm or other unspecified values; 0.75E4 ≤ E3 ≤ 0.96E4, 0.4E4 ≤ E2 ≤ 0.72E4 and 3C ≤ E3 - E2 ≤ 27.8C; E2 + C < E1 < E3 - C, C is the thickness of the area outside the explosion-proof groove 120 on the cover plate 110.

[0085] It is understood that in the embodiment of the present application, the diameter E4 of the cover plate 110 is associated with the corresponding battery product specifications, the dimensions of E2 and E3 are associated with E4, and the dimension of E1 is associated with E2 and E3, thus rationally designing the structural dimensions of the cover plate 110. The structures and parameters of the first sub-section 113, the second sub-section 114, the third sub-section 115, and the fourth sub-section 116 are rationally set to achieve primary and secondary pressure relief of the cover plate 110 while ensuring the strength of the cover plate 110 and the space available after deformation, thereby facilitating the processing of the explosion-proof groove 120.

[0086] In some embodiments, referring to Figures 3, 5, 10, 21 and 22, the second sub-section 114 includes a connected sink 1141 and a boss 1142, the surface of the boss 1142 facing the core 140 is higher than the surface of the sink 1141 facing the core 140 and the surface of the first sub-section 113 facing the core 140, the surface of the boss 1142 away from the core 140 is higher than the surface of the sink 1141 away from the core 140 and the surface of the first sub-section 113 away from the core 140, the first sub-groove 121 is at least partially arranged on the sink 1141, and the second sub-groove 122 is at least partially located on the boss 1142. From the second side surface 112 to the direction of the first side surface 111, the sink 1141 and the first sub-section 113 are located at the same height, that is, the first side surface 111 of the sink 1141 and the first side surface 111 of the first sub-section 113 are located in the same horizontal plane, the second side surface 112 of the sink 1141 and the second side surface 112 of the first sub-section 113 are located in the same horizontal plane, the boss 1142 is arranged higher than the sink 1141, the first side surface 111 of the boss 1142 is higher than the first side surface 111 of the sink 1141, the second side surface 112 of the boss 1142 is higher than the second side surface of the sink 1141, the first sub-groove 121 is at least partially arranged on the sink 1141, and the second sub-groove 122 is at least partially arranged on the boss 1142.

[0087] It can be understood that by forming a sink 1141 and a boss 1142 on the second sub-portion 114, the first sub-groove 121 is at least partially arranged on the sink 1141, and the second sub-groove 122 is arranged on the boss 1142. When the air pressure in the battery increases and the cover plate 110 is deformed, the first sub-groove 121 at the position of the sink 1141 is subjected to the force of the deformation of the cover plate 110, thereby achieving directional opening at the position of the first sub-groove 121 and ensuring the orderly conduct of the secondary pressure relief. Among them, the directional opening at the position of the first sub-groove 121 includes the following two situations: under the first pressure, the first sub-groove 121 is instantly fully opened; or, the first sub-groove 121 has an opening point, and the first sub-groove 121 opens from the opening point to fully open. As shown in Figure 3, the opening point is the intersection of the boss 1142 and the sink 1141 on the first sub-groove 121, and can also be any position on the first sub-groove 121 within the area of ​​the sink 1141. As shown in Figures 18 and 21, the opening point is the intersection of the boss 1142 and the sink 1141 on the first sub-groove 121, or the opening point is any position on the third section 1117 of the first sub-groove 121, or the opening point is any position of the first section 1111 and the second section 1112 of the first sub-groove 121 within the sink 1141 area.

[0088] Based on the above embodiment, the surface of the third sub-portion 115 facing the winding core 140 is not lower than the surface of the boss 1142 facing the winding core 140, and the surface of the third sub-portion 115 away from the winding core 140 is not lower than the surface of the boss 1142 away from the winding core 140. This can maximize the space after the cover plate 110 is deformed.

[0089] Based on the above embodiment, the surface of the first sub-section 113 facing the winding core 140 is higher than the surface of the fourth sub-section 116 facing the winding core 140. The fourth sub-section 116 is used to connect to the battery electrodes. When the cover plate 110 is installed on the battery for use, the fourth sub-section 116 of the cover plate 110 is connected to the battery electrodes, and the cover plate 110 is charged. For the battery, the potential between the cover plate 110 and the battery housing 150 is the same, and there is no potential difference. This reduces the risk of corrosion of the cover plate 110 and improves the reliability of the battery pack. In addition, the surface of the first sub-section 113 away from the winding core 140 is higher than the surface of the fourth sub-section 116 away from the winding core 140.

[0090] Based on the above embodiment, the surface of the first sub-section 113 facing the winding core 140, the surface of the fourth sub-section 116 facing the winding core 140, and the surface of the sinking platform 1141 facing the winding core 140 are located at the same height. In addition, the surface of the first sub-section 113 away from the winding core 140, the surface of the fourth sub-section 116 away from the winding core 140, and the surface of the sinking platform 1141 facing the winding core 140 are located at the same height, facilitating the processing and molding of the cover plate 110.

[0091] In some embodiments, as shown in Figures 4 and 22, the depth of the sink 1141 is A, 0.8C≤A≤1.5C, where C is the thickness of the area outside the explosion-proof groove 120 on the cover 110, such as 1C≤A≤1.3C, where A can be 0.8C, 0.9C, 1.0C, 1.1C, 1.2C, 1.3C, 1.4C, 1.5C, or other unspecified values. The depth of the sink 1141 refers to the vertical distance between the first side 111 of the protrusion 1142 and the first side 111 of the sink 1141.

[0092] In some embodiments, as shown in FIG9 and FIG23 , the width of the top of the sink 1141 is D1, and the width of the bottom of the sink 1141 is D2, wherein 4 mm ≤ D1 ≤ 12 mm; D2 = D1 - 2C*tan(α-90°), and D2 > 2 mm;

[0093] α is the angle formed between the bottom and the side of the sink 1141, 100°≤α≤170°;

[0094] C is the thickness of the area outside the explosion-proof groove 120 on the cover plate 110.

[0095] The value of D1 is 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or other unspecified values, and the value of α is 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or other unspecified values. The dimensions of the sink 1141 are appropriately set to ensure the directional opening effect of the explosion-proof structure.

[0096] In some embodiments, as shown in FIG. 12 , the cover plate 110 includes a first side surface 111 and a second side surface 112 that are oppositely disposed. The first sub-groove 121 and the second sub-groove 122 are both disposed on the second side surface 112 , and the first sub-groove 121 is connected to the second sub-groove 122 .

[0097] It can be understood that arranging the explosion-proof groove 120 on the side of the cover plate 110 close to the winding core is conducive to the explosion-proof groove 120 to ensure the explosion-proof effect.

[0098] In some embodiments, the cover plate 110 includes a first side surface 111 and a second side surface 112 that are oppositely disposed. The first sub-groove 121 is disposed on the first side surface 111 , and the second sub-groove 122 is disposed on the second side surface 112 .

[0099] As a variation, the cover plate 110 includes a first side surface 111 and a second side surface 112 that are oppositely disposed. The second sub-groove 122 is disposed on the first side surface 111 , and the first sub-groove 121 is disposed on the second side surface 112 .

[0100] It is understandable that the first sub-groove 121 and the second sub-groove 122 can be disposed on different sides of the cover plate 110 to facilitate processing.

[0101] In some embodiments, based on the first and second forms, the thickness H2 of the cover plate 110 at the second sub-groove 122 is calculated according to the following formula (1):

[0102] Wherein, Q is the tensile strength of the material of which the cover plate 110 is made;

[0103] E1 is the outer diameter of the ring where the second sub-groove 122 is located;

[0104] P2 is the pressure at which the cover plate 110 at the second sub-groove 122 opens.

[0105] In some embodiments, based on Form 1, the thickness H1 of the cover plate 110 at the first sub-groove 121 is calculated according to the following formula (2):

[0106] Wherein, Q is the tensile strength of the material of which the cover plate 110 is made;

[0107] E1 is the outer diameter of the ring where the second sub-groove 122 is located, and the outer diameters of the first sub-groove 121 and the second sub-groove 122 are the same;

[0108] P1 is the pressure at which the cover plate 110 at the first sub-groove 121 opens.

[0109] The above formulas (1) and (2) are used to calculate the thickness H1 of the cover plate 110 at the first sub-groove 121 and the thickness H2 of the cover plate 110 at the second sub-groove 122. The first sub-groove 121 and the second sub-groove 122 are designed according to different positions and material properties, which facilitates design, ensures accurate calculation results, and ensures the performance of the cover plate 110.

[0110] Referring to Figures 24, 25, 26, 27 and 28, an embodiment of the present application further provides a battery. The battery 100 can be a cylindrical battery. The explosion-proof structure can be applied to the positive or negative side of the battery. The application of the explosion-proof structure to the negative side of the battery is used as an example. The battery includes the above-mentioned explosion-proof structure, a winding core 140 and a shell 150. The winding core 140 is installed in the shell 150. One end of the shell 150 is provided with an opening 151. The cover plate 110 is sealed with the shell 150 to block the opening 151. The battery has the same technical effect as the battery explosion-proof structure and will not be described in detail.

[0111] On the basis of the above embodiment, referring to Figures 27 and 28, the battery further includes a first current collecting disc 160, a second current collecting disc 170, and an insulating member 180. A positive terminal 152 is provided at the other end of the shell 150, and the winding core 140, the first current collecting disc 160, and the second current collecting disc 170 are all disposed within the shell 150. The cover plate 110 is sealedly connected to the shell 150 and blocks the opening 151. The second side surface 112 of the cover plate 110 abuts against one side surface of the first current collecting disc 160. The other side surface of the first current collecting disc 160 is welded to the negative terminal of the winding core 140. The peripheral side of the first current collecting disc 160 is connected to the inner surface of the shell 150 to charge the shell 150. There is no potential difference between the cover plate 110 and the shell 150, which reduces the risk of corrosion of the cover plate 110 and improves the reliability of the battery. A positive terminal 152 is provided at the end of the housing 150 facing away from the cover plate 110. The positive terminal 152 is sealed to the housing 150 via an insulating sealing ring. A second current collecting disc 170 is welded to the winding core 140 and the positive terminal 152 and is disposed between the positive end of the winding core 140 and the positive terminal 152. Furthermore, an insulating member 180 is provided between the second current collecting disc 170 and the end of the housing 150, insulating the second current collecting disc 170 from the housing 150. The first side surface 111 is the surface of the cover plate 110 facing away from the winding core 140, and the second side surface 112 is the surface of the cover plate 110 facing the winding core 140.

[0112] In some embodiments, the area of ​​the outer circle formed by the explosion-proof groove 120 on the cover plate 110 is It refers to the area calculated based on the outer diameter of the ring formed by the explosion-proof groove 120 on the cover plate 110. In the direction perpendicular to the axis of the shell 150, the cross-sectional area of ​​the shell 150 is in,

[0113] Understandably, The value of can be 0.27, 0.3, 0.4, 0.5, 0.6, 0.6, 0.6, 7.6 or other unspecified values. and ratio to ensure the pressure relief effect of the explosion-proof structure.

[0114] In some embodiments, the side wall of the shell 150 near the opening 151 shrinks inward to form a flange 153, and a pressure plate 154 is provided on the opening 151 of the shell 150. The pressure plate 154 and the flange 153 are arranged relative to each other, and the cover 110 is installed between the flange 153 and the pressure plate 154. A seal 155 is provided between the cover 110 and the flange 153 and the pressure plate 154. The seal 155 is a sealing ring, and the compression rate of the sealing ring is between 30% and 70%, which ensures the sealing of the cover 110 and improves the pressure relief effect of the explosion-proof structure.

[0115] In other embodiments, the cover plate 110 and the shell 150 are connected by laser welding. The laser welding process is simple and has good sealing. At this time, the first collecting plate 160 is in direct contact with the shell 150 and can also be in direct contact with the cover plate 110 to make the shell 150 negatively charged.

[0116] The present application also provides a battery pack including the above-mentioned battery 100. The battery pack has the same technical effects as the battery explosion-proof structure, which will not be described in detail.

[0117] In some embodiments, as shown in Figures 29, 30, and 31, the battery pack further includes a mounting base 130 having a plurality of mounting slots 131 and a plurality of baffles 132. The batteries, mounting slots 131, and baffles 132 correspond one to one. The end of the battery 100 closest to the cover plate 110 is mounted in the mounting slot 131. The baffles 132 are located on the side of the mounting slot 131 facing away from the battery 100. The first sub-slot 121 has a first slot wall 1211 and a second slot wall 1212. The second slot wall 1212 is closer to the center of the cover plate 110 than the first slot wall 1211. The projection of the baffles 132 on a side of the cover plate 110 is located on the side of the first slot wall 1211 facing away from the second slot wall 1212. The baffles 132 can be flat or curved.

[0118] It can be understood that as the pressure inside the battery 100 increases, the first sub-groove 121 in the sink 1141 opens, and the gas and substances in the battery 100 are ejected from the side of the first sub-groove 121. By setting a baffle 132 on the mounting base 130, the baffle 132 is located below the sink 1141, and the projection of the baffle 132 on the plane where the cover 110 is located is aligned with the first sub-groove 121. The blocking area of ​​the baffle 132 is large, and the baffle 132 blocks the substances ejected from the battery 100, thereby preventing the ejected substances from entering the adjacent battery 100 and contaminating the adjacent battery 100.

[0119] 31 , the baffle 132 is an arc-shaped plate, the arc length of the baffle 132 is L4, the arc length of the area where the first sub-groove 121 is located is L5, L4 ≥ L5, so that the baffle 132 has a larger blocking area and a better blocking effect.

[0120] Based on the above embodiment, as shown in FIG15 , the mounting base 130 includes a first sub-plate 133 and a second sub-plate 134. The first sub-plate 133 and the second sub-plate 134 are spaced apart from each other along the thickness direction of the mounting base 130. The first sub-plate 133 and the second sub-plate 134 are connected. A mounting groove 131 is defined in the first sub-plate 133. A baffle 132 is located between the first sub-plate 133 and the second sub-plate 134, and the baffle 132 is connected to the first sub-plate 133. When the cover 110 is opened, the material flowing out flows between the first sub-plate 133 and the second sub-plate 134 to avoid affecting other batteries.

[0121] The technical solutions and technical effects of the present application are described in detail below through specific examples and comparative examples. The following examples are only some examples of the present application and do not specifically limit the present application.

[0122] This example aims to investigate the effect of applying an explosion-proof structure to a battery on battery performance.

[0123] First test group

[0124] The explosion-proof structure in this test group is as follows: as shown in Figure 1, the cover plate 110 includes a first side surface 111 and a second side surface 112 arranged opposite to each other, the first sub-groove 121 and the second sub-groove 122 are both arranged on the first side surface 111, the first sub-groove 121 and the second sub-groove 122 are both arc-shaped rings, the first sub-groove 121 and the second sub-groove 122 are connected end to end, the first sub-groove 121 and the second sub-groove 122 are communicated, and the projection of the first sub-groove 121 and the second sub-groove 122 on one side of the cover plate 110 is an arc shape. The parameters of the cover plate 110 involve H1, H2, H2-H1, a, C, G, and E1.

[0125] Test method: Adopt Article 6.2.4 of GB / T31485-2015 standard.

[0126] Evaluation criteria: The opening time of the first sub-slot 121 is T1, the opening time of the second sub-slot 122 is T2, and the opening time difference between the first sub-slot 121 and the second sub-slot 122 is ΔT, wherein T1 and T2 meet the following conditions: 50s≤T1≤100s, 60s≤T2≤150s, 5s≤ΔT≤50s.

[0127] Set basic group 1. The parameters and verification results of basic group 1 are shown in Table 1.1 below.

[0128] Table 1.1: Parameters and verification results of basic group 1

[0129] According to the verification results in Table 1.1, the opening time of the first sub-slot 121 and the opening time of the second sub-slot 122 both meet the evaluation standards, meeting the performance of the explosion-proof structure while achieving secondary pressure relief.

[0130] Based on the parameters of basic group 1, the parameter changes of the cover plate 110 are controlled by the single variable method to set the comparative example and the embodiment. The parameter change table and verification results of the comparative example and the embodiment are shown in Tables 1.2 to 1.5.

[0131] Table 1.2: Verification results of comparative examples and examples with basic group 1 as parameters and changes in H1 and H2

[0132] According to Table 1.2, when H1 is within the set range, it meets the performance of the explosion-proof structure and realizes secondary pressure relief. When H1 is not within the set range, the time interval between the two pressure reliefs is short, resulting in a reduction in the secondary pressure relief effect of the explosion-proof structure.

[0133] Table 1.3: Verification results of comparative examples and examples with basic group 1 as parameters, by changing H2 to achieve H2-H1 change

[0134] According to Table 1.3, when H2 and H2-H1 are within the set range, the performance of the explosion-proof structure is met and secondary pressure relief is achieved. When H2-H1 is lower than the set range, the time interval between the two pressure reliefs is short. When H2-H1 is higher than the set range, the time interval between the two pressure reliefs is long, or the second sub-slot 122 is opened late, the effect of the secondary pressure relief of the explosion-proof structure is reduced.

[0135] Table 1.4: Verification results of comparative examples and examples with different G settings using basic group 1 as parameters

[0136] According to Table 1.4, when G is within the set range, it meets the performance of the explosion-proof structure and realizes secondary pressure relief. When G is lower than the set range, the time interval between the two pressure reliefs is longer. When G is higher than the set range, the time interval between the two pressure reliefs is shorter, and the secondary pressure relief effect of the explosion-proof structure is reduced.

[0137] Table 1.5: Verification results of comparative examples and examples with basic group 1 as parameters and E1 settings changed

[0138] According to Table 1.5, when E1 is within the set range, the explosion-proof structure performance is met and secondary pressure relief is achieved. When E1 is lower or higher than the set range, the time interval between the two pressure reliefs is longer and the secondary pressure relief effect of the explosion-proof structure is reduced.

[0139] Second test group

[0140] The explosion-proof structure in this test set is as follows: As shown in Figure 2, the cover plate 110 includes a first side surface 111 and a second side surface 112, both of which are oppositely disposed. A first sub-groove 121 and a second sub-groove 122 are both disposed on the first side surface 111. Both the first sub-groove 121 and the second sub-groove 122 are arc-shaped rings, connected end-to-end, and communicating with each other. The cover plate 110 includes a first sub-section 113 and a second sub-section 114. The first sub-section 113 and the second sub-section 114 are adjacent to each other. The first sub-section is located near the edge of the cover plate 110, pointing from the second side surface 112 toward the first side surface 111. The second sub-section 114 is higher than the first sub-section 113. The explosion-proof groove 120 is disposed on the second sub-section 114. The parameters of the cover plate 110 include H1, H2, H2-H1, a, C, G, B, E1, E2, E3, E4, and E3-E2.

[0141] Test method: Adopt Article 6.2.4 of GB / T31485-2015 standard.

[0142] Evaluation criteria: The opening time of the first sub-slot 121 is T1, and the opening time of the second sub-slot 122 is T2, wherein T1 and T2 meet the following conditions: 50s≤T1≤100s, 60≤T2≤150s, 5s≤ΔT≤50s.

[0143] Set basic group 2. The parameters and verification results of basic group 2 are shown in Table 2.1 below.

[0144] Table 2.1: Parameters and verification results of basic group 2

[0145] According to the verification results in Table 2.1, the opening time of the first sub-slot 121 and the opening time of the second sub-slot 122 both meet the evaluation standards, meeting the performance of the explosion-proof structure while achieving secondary pressure relief.

[0146] According to the comparison of the verification results of basic group 1 and basic group 2, it can be seen that setting the explosion-proof groove 120 on the second sub-section 114 will increase the interval difference between the two pressure reliefs while ensuring the safety performance of the battery, thereby improving the secondary pressure relief effect of the explosion-proof structure.

[0147] Based on the parameters of basic group 2, the parameter changes of the cover plate 110 are controlled by the single variable method to set the comparative example and the embodiment. The variable parameters and verification results of the comparative example and the embodiment are shown in Tables 2.2 to 2.3.

[0148] Table 2.2: Verification results of comparative examples and examples with different B settings using the parameters of basic group 2

[0149] According to Table 2.2, when B is within the set range, the performance of the explosion-proof structure is met and secondary pressure relief is achieved. When B is lower than or exceeds the set range, the time interval between the two pressure reliefs is short and the secondary pressure relief effect of the explosion-proof structure is reduced.

[0150] Table 2.3: Verification results of comparative examples and examples with parameters of basic group 2 and changes in E1, E2, and E3 settings

[0151] According to Table 2.2, E1, E2, E3 and (E3-E2) are all within the set range, meeting the performance of the explosion-proof structure while achieving secondary pressure relief. When E2 is not within the set range, the time interval between the two pressure reliefs is short, and the secondary pressure relief effect of the explosion-proof structure is reduced.

[0152] The third test group

[0153] The explosion-proof structure of this test set is as follows: As shown in FIG3 , the cover plate 110 includes a first side surface 111 and a second side surface 112 disposed opposite each other, a first sub-groove 121 and a second sub-groove 122 both disposed on the first side surface 111, and both the first sub-groove 121 and the second sub-groove 122 are arc-shaped circular rings, connected end to end, and communicating with each other. The cover plate 110 includes a first sub-portion 113 and a second sub-portion 114, the first sub-portion 113 and the second sub-portion 114 being adjacent to each other. The first sub-portion 113 is adjacent to the second sub-portion 114, and the first sub-portion is close to the edge of the cover plate 110, pointing from the second side surface 112 toward the first side surface 111. The surface of the second sub-portion 114 facing the winding core 140 is at least partially higher than the surface of the first sub-portion 113 facing the winding core 140, and the surface of the second sub-portion 114 away from the winding core 140 is at least partially higher than the surface of the first sub-portion 113 away from the winding core 140. The explosion-proof groove 120 is disposed on the second sub-portion 114. The second sub-section 114 includes a connected sink 1141 and a boss 1142. The sink 1141 and boss 1142 form a closed ring. The surface of the boss 1142 facing the winding core 140 is higher than the surface of the sink 1141 facing the winding core 140 and the surface of the first sub-section 113 facing the winding core 140. The surface of the boss 1142 facing away from the winding core 140 is higher than the surface of the sink 1141 facing away from the winding core 140 and the surface of the first sub-section 113 facing away from the winding core 140. The first sub-groove 121 is at least partially disposed on the sink 1141, and the second sub-groove 122 is at least partially located on the boss 1142. Parameters of the cover plate 110 include H1, H2, H2-H1, a, C, G, A, E1, E2, E3, E4, E3-E2, D1, D2, and α.

[0154] Test method: Adopt Article 6.2.4 of GB / T31485-2015 standard.

[0155] Evaluation criteria: The opening time of the first sub-slot 121 is T1, and the opening time of the second sub-slot 122 is T2, wherein T1 and T2 meet the following conditions: 50s≤T1≤100s, 60s≤T2≤150s, 15s≤ΔT≤50s.

[0156] Set basic group 3. The parameters and verification results of basic group 3 are shown in Table 3.1 below.

[0157] Table 3.1: Parameters of basic group 3

[0158] According to the verification results in Table 3.1, the opening time of the first sub-slot 121 and the opening time of the second sub-slot 122 both meet the evaluation standards, meeting the performance of the explosion-proof structure while achieving secondary pressure relief.

[0159] According to the comparison of the verification results of basic group 1, basic group 2 and basic group 3, it can be seen that the second sub-section 114 is provided with a sink 1141 and a boss 1142. Under the premise of ensuring the safety performance of the battery, the time interval between the primary pressure relief and the secondary pressure relief is longer, the secondary pressure relief effect is good, and the reliability of the explosion-proof structure is further improved.

[0160] Based on the parameters of basic group 3, the parameter changes of the cover plate 110 are controlled by the single variable method to set the comparative example and the embodiment. The variable parameters and verification results of the comparative example and the embodiment are shown in Table 3.2.

[0161] Table 3.2: Verification results of comparative examples and examples based on basic group 3, where D1 and D2 are changed as D1 is changed

[0162] According to Table 3.1: When D1 is within the set range, the performance of the explosion-proof structure is met and secondary pressure relief is achieved. When D1 is lower than the set range, the time interval between the two pressure reliefs is longer. When D1 exceeds the set range, the time interval between the two pressure reliefs is shorter, and the secondary pressure relief effect of the explosion-proof structure is reduced.

[0163] The fourth test group

[0164] The explosion-proof structure of the battery in this test group is as follows: As shown in Figure 14, a first sub-groove 121 and a second sub-groove 122 are provided on the first side 111 of the cover plate 110. The first sub-groove 121 includes a first section 1111, a second section 1112, and a third section 1117. The first section 1111, the second section 1112, and the third section 1117 are all arc-shaped. The second sub-groove 122 is annular. In the radial direction of the cover plate 110, the first sub-groove 121 is closer to the center of the cover plate 110 than the second sub-groove 122.

[0165] Test method: Adopt Article 6.2.4 of GB / T31485-2015 standard.

[0166] Evaluation criteria: The opening time of the first sub-slot 121 is T1, the opening time of the second sub-slot 122 is T2, and the opening time difference between the first sub-slot 121 and the second sub-slot 122 is ΔT, wherein T1 and T2 meet the following conditions: 50s≤T1≤100s, 60s≤T2≤150s, and time 5s≤ΔT≤50s.

[0167] The parameters involved in the cover plate 110 include: H1, H2, H2-H1, a, C, E1, L1, L2, L3, β, L1 and L2 are the same, and the parameters of the basic group 4 are shown in the following Table 4.1.

[0168] Table 4.1: Parameters and verification results of basic group 4

[0169] According to the verification results in Table 4.1, the opening time of the first sub-slot 121 and the opening time of the second sub-slot 122 both meet the evaluation standards, meeting the performance of the explosion-proof structure while achieving secondary pressure relief.

[0170] Based on the parameters of basic group 4, the parameter changes of the cover plate 110 are controlled by the single variable method to set the comparative example and the embodiment. The parameter change tables and verification results of the comparative example and the embodiment are shown in Tables 4.2 to 4.7.

[0171] Table 4.2: Verification results of comparative examples and examples with basic group 4 as the basis, changing H1 and H2 accordingly

[0172] According to Table 4.2, when H1 is within the set range, the performance of the explosion-proof structure is met while achieving secondary pressure relief. When H1 is lower than the set range, the opening time of the first and second stage pressure relief are both earlier. When H1 exceeds the set range, the time interval between the two pressure reliefs is shorter, and the secondary pressure relief effect of the explosion-proof structure is not good.

[0173] Table 4.3: Verification results of comparative examples and examples using basic group 4 as parameters and changing H2 to achieve the change of H2-H1

[0174] According to Table 4.3, when H2-H1 is within the set range, the performance of the explosion-proof structure is met while achieving secondary pressure relief. When H2-H1 is lower than or within the set range, the time interval between the two pressure reliefs is short. When H2-H1 exceeds the set range, the time interval between the two pressure reliefs is too long, resulting in an increased probability of battery explosion and a reduced secondary pressure relief effect of the explosion-proof structure.

[0175] Table 4.4: Verification results of comparative examples and examples with different L3 settings using basic group 4 as parameters

[0176] According to Table 4.4, when L3 is within the set range, it meets the performance of the explosion-proof structure and realizes secondary pressure relief. When L3 is lower than the set range, the time interval between the two pressure reliefs is shorter. When L3 exceeds the set range, the time interval between the two pressure reliefs is longer, resulting in a decrease in the secondary pressure relief effect of the explosion-proof structure.

[0177] Table 4.5: Verification results of comparative examples and examples with basic group 4 as parameters and changing L1 and L2 settings

[0178] According to Table 4.5, when L1 and L2 are within the set range, they meet the performance of the explosion-proof structure and achieve secondary pressure relief. When L1 and L2 are lower than the set range, the time interval between the two pressure reliefs is too long. When L1 and L2 exceed the set range, the time interval between the two pressure reliefs is short, resulting in a reduced secondary pressure relief effect of the explosion-proof structure.

[0179] Table 4.6: Verification results of comparative examples and examples with different β settings using basic group 4 as parameters

[0180] According to Table 4.6, when β is within the set range, the performance of the explosion-proof structure is met while achieving secondary pressure relief. When β is lower than the set range, the time interval between the two pressure reliefs is shorter. When β exceeds the set range, the time interval between the two pressure reliefs is longer, resulting in a reduction in the secondary pressure relief effect of the explosion-proof structure.

[0181] Fifth test group

[0182] The explosion-proof structure of the battery in this test set is as follows: As shown in FIG18 , a first sub-groove 121 and a second sub-groove 122 are provided on the first side 111 of the cover plate 110. The first sub-groove 121 comprises a first section 1111, a second section 1112, and a third section 1117. Each of the first section 1111, the second section 1112, and the third section 1117 is arc-shaped. The second sub-groove 122 is annular. Along the radial direction of the cover plate 110, the first sub-groove 121 is closer to the center of the cover plate 110 than the second sub-groove 122. The cover plate 110 comprises a first sub-portion 113 and a second sub-portion 114. The surface of the second sub-portion 114 facing away from the winding core 140 is higher than the surface of the first sub-portion 113 facing away from the winding core 140. The surface of the second sub-portion 114 facing the winding core 140 is higher than the surface of the first sub-portion 113 facing the winding core 140. Both the first sub-groove 121 and the second sub-groove 122 are provided on the second sub-portion 114.

[0183] Test method: Adopt Article 6.2.4 of GB / T31485-2015 standard.

[0184] Evaluation criteria: The opening time of the first sub-slot 121 is T1, the opening time of the second sub-slot 122 is T2, and the time interval between the opening of the first sub-slot 121 and the opening of the second sub-slot 122 is ΔT, wherein T1 and T2 meet the following conditions: 50s≤T1≤100s, 60s≤T2≤150s, 5s≤ΔT≤50s.

[0185] The parameters involved in the cover plate 110 include: H1, H2, H2-H1, a, C, L1, L2, L3, β, and E1. Set basic group 5. The parameters and verification results of basic group 5 are shown in Table 5.1.

[0186] Table 5.1: Parameters and verification results of basic group 5

[0187] According to the verification results in Table 5.1, the opening time of the first sub-slot 121 and the opening time of the second sub-slot 122 both meet the evaluation standards, meeting the performance of the explosion-proof structure while achieving secondary pressure relief.

[0188] Based on the parameters of the basic group 5, the parameter changes of the cover plate 110 are controlled by the single variable method to set the comparative example and the embodiment. The variable parameters and verification results of the comparative example and the embodiment are shown in Table 5.2.

[0189] Table 5.2: Verification results of comparative examples and examples with different B settings using the parameters of basic group 5

[0190] According to Table 5.2, when B is within the set range, the purpose of secondary pressure relief can be achieved. When B is lower than the set range, the time interval between the two pressure reliefs is shorter. When B exceeds the set range, the time interval between the two pressure reliefs is longer, resulting in a decrease in the secondary pressure relief effect of the explosion-proof structure.

[0191] Sixth test group

[0192] The explosion-proof structure of this test set is as follows: As shown in FIG12 , the cover plate 110 includes a first side surface 111 and a second side surface 112 disposed opposite each other, a first sub-groove 121 and a second sub-groove 122 both disposed on the first side surface 111, and both the first sub-groove 121 and the second sub-groove 122 are arc-shaped circular rings, connected end to end, and communicating with each other. The cover plate 110 includes a first sub-portion 113 and a second sub-portion 114, the first sub-portion 113 and the second sub-portion 114 being adjacent to each other. The first sub-portion 113 is adjacent to the second sub-portion 114, and the first sub-portion is close to the edge of the cover plate 110, pointing from the second side surface 112 toward the first side surface 111. The surface of the second sub-portion 114 facing away from the winding core 140 is at least partially higher than the surface of the first sub-portion 113 facing away from the winding core 140, and the surface of the second sub-portion 114 facing the winding core 140 is at least partially higher than the surface of the first sub-portion 113 facing the winding core 140. The explosion-proof groove 120 is disposed on the second sub-portion 114. The second sub-section 114 is connected to the sink 1141 and the boss 1142, and the sink 1141 and the boss 1142 form a closed ring. The second sub-section 114 includes the connected sink 1141 and the boss 1142. The surface of the boss 1142 facing the core 140 is higher than the surface of the sink 1141 facing the core 140 and the surface of the first sub-section 113 facing the core 140. The surface of the boss 1142 facing away from the core 140 is higher than the surface of the sink 1141 facing away from the core 140 and the surface of the first sub-section 113 facing away from the core 140. The first sub-groove 121 is at least partially arranged on the sink 1141, and the second sub-groove 122 is at least partially located on the boss 1142.

[0193] The parameters of the cover plate 110 involve H1, H2, E1, H2-H1, a, C, L1, L2, L3, β, A, D1, D2 and α.

[0194] Set basic group 6. The parameters of basic group 6 are shown in 6.1 below.

[0195] Table 6.1: Parameters and verification results of basic group 6

[0196] According to the verification results in Table 6.1, the opening time of the first sub-slot 121 and the opening time of the second sub-slot 122 both meet the evaluation standards, meeting the performance of the explosion-proof structure while achieving secondary pressure relief.

[0197] According to the verification structure of basic group 5 and basic group 6, it can be seen that a sink 1141 and a boss 1142 are set on the second sub-section 114. Under the premise of ensuring the safety performance of the battery, the time interval between the primary pressure relief and the secondary pressure relief is longer, the secondary pressure relief effect is good, and the reliability of the explosion-proof structure is further improved.

[0198] Based on the parameters of basic group 6, the parameter changes of the cover plate 110 are controlled by the single variable method to set the comparative example and the embodiment. The variable parameters and verification results of the comparative example and the embodiment are shown in Table 6.2.

[0199] Table 6.2: Verification results of comparative examples and examples based on basic group 6, where D1 and D2 are changed as D1 is changed

[0200] According to Table 6.2: When D1 is within the set range, the purpose of secondary pressure relief can be achieved and the secondary pressure relief effect is better. When D1 is lower than the set range, the interval between the two pressure reliefs is longer. When D1 exceeds the set range, the interval between the two pressure reliefs is longer, resulting in a decrease in the secondary pressure relief effect of the explosion-proof structure.

Claims

1. An explosion-proof structure is applied to a battery and includes: A cover plate (110); An explosion-proof groove (120) is provided on the cover plate (110). The explosion-proof groove (120) includes a first sub-groove (121) and a second sub-groove (122). The thickness of the cover plate (110) at the position where the first sub-groove (121) is located is H1, and the thickness of the cover plate at the position where the second sub-groove (122) is located is H2, where H1 < H2. Among them, under a first pressure, the cover plate (110) at the first sub-groove (121) opens, and under a second pressure, the cover plate (110) at the second sub-groove (122) opens. The first pressure is P1, where 0.5 Mpa < P1 < 1.5 Mpa, and the second pressure is P2, where 1.5 Mpa ≤ P2 < 2.5 Mpa.

2. The explosion-proof structure according to claim 1, wherein, The projections of the first sub-groove (121) and the second sub-groove (122) on one side of the cover plate (110) enclose a closed ring.

3. The explosion-proof structure according to claim 1, wherein, The first sub-groove (121) includes a first section (1111) and a second section (1112). The first section (1111) has a first end (1113) and a second end (1114), and the second section (1112) has a third end (1115) and a fourth end (1116). The distance between the first end (1113) and the third end (1115) is greater than the distance between the second end (1114) and the fourth end (1116).

4. The explosion-proof structure according to claim 3, wherein, The first sub-groove (121) and the second sub-groove (122) are arranged at intervals, and the first sub-groove (121) is closer to the center of the cover plate (110) than the second sub-groove (122).

5. The explosion-proof structure according to claim 3, wherein, The second sub-groove (122) is arc-shaped. The second sub-groove (122) includes a fifth end (1121) and a sixth end (1122), and the second sub-groove (122) is located between the fifth end (1121) and the sixth end (1122).

6. The explosion-proof structure according to claim 5, wherein, The first end (1113) is connected to the fifth end (1121), and the third end (1115) is connected to the sixth end (1122). The first sub-groove (121) and the second sub-groove (122) are connected and enclosed into a closed shape.

7. The explosion-proof structure according to claim 3, wherein, The second end (1114) is closer to the center of the cover plate (110) than the first end (1113), and the fourth end (1116) is closer to the center of the cover plate (110) than the third end (1115); Or, the first end (1113) is closer to the center of the cover plate (110) than the second end (1114), and the third end (1115) is closer to the center of the cover plate (110) than the fourth end (1116).

8. The explosion-proof structure according to claim 3, wherein, The first sub-groove (121) further includes a third section (1117). The third section (1117) is arranged between the second end (1114) and the fourth end (1116), and the third section (1117) is smoothly connected to the first section (1111) and the second section (1112).

9. The explosion-proof structure according to claim 8, wherein, The first section (1111), the second section (1112) and the third section (1117) are all arc-shaped, and the bending direction of the first section (1111) and the second section (1112) is different from the bending direction of the third section (1117).

10. The explosion-proof structure according to claim 9, wherein, An angle β is formed between the chord corresponding to the arc of the first section (1111) and the chord corresponding to the arc of the second section (1112), wherein 30°≤β≤150°.

11. The explosion-proof structure according to claim 9, wherein, The arc length of the first section (1111) is L1, the arc length of the second section (1112) is L2, and the arc length of the third section (1117) is L3, 4mm≤L1=L2≤8mm, 1mm≤L3≤3mm.

12. The explosion-proof structure according to any one of claims 1 to 11, wherein, 20μm≤H1≤115μm, 25μm≤H2≤135μm.

13. The explosion-proof structure according to any one of claims 1 to 11, wherein, 5μm≤H2-H1≤20μm.

14. The explosion-proof structure according to any one of claims 1 to 11, wherein, Calculate the thickness H2 of the cover plate (110) at the second sub-groove (122) according to the following formula (1). Wherein, Q is the tensile strength of the material used to make the cover plate (110); E1 is the outer diameter of the ring where the second sub-groove (122) is located; P2 is the pressure at which the cover plate (110) at the second sub-groove (122) opens.

15. The explosion-proof structure according to claim 2, wherein, Calculate the thickness H1 of the cover plate (110) at the first sub-groove (121) according to the following formula (2). Wherein, Q is the tensile strength of the material used to make the cover plate (110); E1 is the outer diameter of the circular ring where the second sub-groove (122) is located, and the outer diameters of the first sub-groove (121) and the second sub-groove (122) are the same; P1 is the pressure at which the cover plate (110) at the first sub-groove (121) opens.

16. The explosion-proof structure according to claim 2, wherein, The ratio of the arc length of the first sub-slot (121) to the arc length of the second sub-slot (122) is G.

17. The explosion-proof structure according to any one of claims 1 to 11, wherein, The cover plate (110) comprises a first sub-portion (113) and a second sub-portion (114); the first sub-portion (113) and the second sub-portion (114) are adjacent to each other; the first sub-portion (113) is close to the edge of the cover plate (110); at least a portion of the surface of the second sub-portion (114) facing the winding core (140) is higher than a surface of the first sub-portion (113) facing the winding core (140); at least a portion of the surface of the second sub-portion (114) away from the winding core (140) is higher than a surface of the first sub-portion (113) away from the winding core (140); and the explosion-proof groove (120) is arranged on the second sub-portion (114).

18. The explosion-proof structure according to claim 17, wherein, The second sub-section (114) includes a connected sink (1141) and a boss (1142); the surface of the boss (1142) facing the core (140) is higher than the surface of the sink (1141) facing the core (140) and the surface of the first sub-section (113) facing the core (140); the surface of the boss (1142) facing away from the core (140) is higher than the surface of the sink (1141) facing away from the core (140) and the surface of the first sub-section (113) facing away from the core (140); the first sub-groove (121) is at least partially arranged on the sink (1141), and the second sub-groove (122) is at least partially located on the boss (1142).

19. The explosion-proof structure according to claim 18, wherein, The cover plate (110) further includes a third sub - part (115), the third sub - part (115) is circular, the third sub - part (115) is concentric with the second sub - part (114), and the counterbore (1141) and the boss (1142) enclose a closed ring.

20. The explosion-proof structure according to claim 19, wherein, The cover plate (110) further includes a fourth sub - part (116), the fourth sub - part (116) is annular, the fourth sub - part (116) is located between the second sub - part (114) and the third sub - part (115), and the fourth sub - part (116) connects the second sub - part (114) and the third sub - part (115).

21. The explosion-proof structure according to claim 20, wherein, The surface of the first sub - part (113) facing the core (140) is higher than the surface of the fourth sub - part (116) facing the core (140), and the fourth sub - part (116) is used to connect with the electrode of the battery; Or, the surface of the first sub - part (113) facing the core (140), the surface of the fourth sub - part (116) facing the core (140), and the surface of the counterbore (1141) facing the core (140) are at the same height.

22. The explosion-proof structure according to claim 19, wherein, The surface of the third sub - part (115) facing the core (140) is not lower than the surface of the boss (1142) facing the core (140), and the surface of the third sub - part (115) away from the core (140) is not lower than the surface of the boss (1142) away from the core (140).

23. The explosion-proof structure according to claim 18, wherein, The width of the top of the counterbore (1141) is D1, the width of the bottom of the counterbore (1141) is D2, where 4mm ≤ D1 ≤ 12mm; D2 = D1 - 2C * tan(α - 90°), and D2 > 2mm; α is the angle formed between the bottom and the side of the counterbore (1141), 100° ≤ α ≤ 170°; C is the thickness of the area outside the explosion - proof groove (120) on the cover plate (110).

24. The explosion-proof structure according to claim 18, wherein, The depth of the counterbore (1141) is A, 0.8C ≤ A ≤ 1.5C, where C is the thickness of the area outside the explosion - proof groove (120) on the cover plate (110).

25. The explosion-proof structure according to claim 18, wherein, The inner diameter of the second sub - part (114) is E2, the outer diameter of the second sub - part (114) is E3, the diameter of the cover plate (110) is E4, and the thickness of the area outside the explosion - proof groove (120) on the cover plate (110) is C, where 42mm ≤ E4 ≤ 46mm; 0.75E4 ≤ E3 ≤ 0.96E4, 0.4E4 ≤ E2 ≤ 0.72E4 and 3C ≤ E3 - E2 ≤ 27.8C.

26. The explosion-proof structure according to claim 18, wherein, The outer diameter of the ring where the second sub - groove (122) is located is E1, E2 + C ≤ E1 ≤ E3 - C.

27. The explosion-proof structure according to any one of claims 1 to 11, wherein, The thickness of the area outside the explosion - proof groove (120) on the cover plate (110) is C, 0.4mm ≤ C ≤ 1.0mm.

28. The explosion-proof structure according to any one of claims 1 to 11, wherein, The notch width of the first sub - groove (121) is the same as that of the second sub - groove (122), both are a, where 0.6mm ≤ a ≤ 1.5mm.

29. The explosion-proof structure according to any one of claims 1 to 11, wherein, Along the thickness direction of the cover plate (110), the cross-sectional shape of the first sub-groove (121) and / or the second sub-groove (122) is V-shaped, semicircular, trapezoidal, "U"-shaped or parabolic.

30. The explosion-proof structure according to any one of claims 1 to 11, wherein, The cover plate (110) comprises a first side surface (111) and a second side surface (112) which are arranged opposite to each other, and the first sub-groove (121) and the second sub-groove (122) are both arranged on the first side surface (111); Alternatively, the cover plate (110) comprises a first side surface (111) and a second side surface (112) that are arranged opposite to each other, and the first sub-groove (121) and the second sub-groove (122) are both arranged on the second side surface (112); Alternatively, the cover plate (110) comprises a first side surface (111) and a second side surface (112) that are arranged opposite to each other, the first sub-groove (121) is arranged on the first side surface (111), and the second sub-groove (122) is arranged on the second side surface (112); Alternatively, the cover plate (110) comprises a first side surface (111) and a second side surface (112) which are arranged opposite to each other, the first sub-groove (121) is arranged on the second side surface (112), and the second sub-groove (122) is arranged on the first side surface (111).

31. A battery comprising: The explosion-proof structure according to any one of claims 1 to 30; Roll core (140); A shell (150), the winding core (140) is installed in the shell (150), one end of the shell (150) is provided with an opening (151), and the cover plate (110) is sealedly connected to the shell (150) to block the opening (151).

32. The battery according to claim 31 further comprises a positive terminal (152), a first current collecting disk (160), a second current collecting disk (170) and an insulating member (180), wherein the positive terminal (152) is arranged at one end of the shell (150) away from the cover plate (110), the first current collecting disk (160) is welded to the winding core (140) and is arranged between the cover plate (110) and one end of the winding core (140), the second current collecting disk (170) is welded to the winding core (140) and the positive terminal (152) and is arranged between the winding core (140) and the positive terminal (152), and the insulating member (180) is arranged between the second current collecting disk (170) and the shell (150).

33. A battery pack comprising the battery according to claim 31 or 32.

34. The battery pack according to claim 33, further comprising: The mounting seat (130) is provided with a plurality of mounting grooves (131) and a plurality of baffles (132), one end of the battery close to the cover plate (110) is mounted in the mounting groove (131), the baffle (132) is located on a side of the mounting groove (131) away from the battery, the first sub-groove (121) has a first groove wall (1211) and a second groove wall (1212), the second groove wall (1212) is closer to the first groove wall (1211) than the first groove wall (1211). At the center of the cover plate (110), the projection of the baffle plate (132) on one side of the cover plate (110) is located on the side of the first groove wall (1211) away from the second groove wall (1212).

35. The battery pack according to claim 34, wherein, The mounting base (130) includes a first sub-plate (133) and a second sub-plate (134), the first sub-plate (133) and the second sub-plate (134) are arranged relatively spaced apart, the mounting groove (131) is formed on the first sub-plate (133), the baffle plate (132) is located between the first sub-plate (133) and the second sub-plate (134), and the baffle plate (132) is connected to the first sub-plate (133).

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