Battery housing, battery, and battery pack

Abstract

A battery housing (100), a battery, and a battery pack. The battery housing comprises a bottom plate (10) and a surrounding plate (20). The surrounding plate (20) and the bottom plate (10) jointly define an accommodating cavity having an opening (201), and the opening (201) and the bottom plate (10) are arranged opposite to each other; the bottom plate (10) has a center point, the bottom plate (10) is provided with an explosion-proof score (111), and the explosion-proof score (111) has an inner edge (101) closest to the center point and an outer edge (102) farthest from the center point, the distance between the inner edge (101) and the center point is greater than or equal to 1 / 2 of the radius of the bottom plate, and the distance between the outer edge (102) and the center point is less than or equal to 4 / 5 of the radius of the bottom plate.

Description

Battery shell, battery and battery pack

[0001] The present application claims priority to the Chinese patent application No. 202420713967.3, filed on April 8, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery shell, a battery and a battery pack. BACKGROUND

[0003] When a battery is in a state of high temperature, overcharge or short circuit, a large amount of gas will be generated inside the battery, which will cause the gas pressure in the battery shell to rise sharply. In order to prevent the battery from exploding, an anti-explosion notch is usually provided on the battery shell to achieve pressure relief and exhaust by breaking the anti-explosion notch. SUMMARY

[0004] However, after the anti-explosion notch is opened on the battery shell, the core pack usually needs to be installed and the battery strength safety performance test needs to be performed, etc. In the related art, the anti-explosion notch tends to break prematurely. For example, during the installation of the core pack, the area close to the center of the battery shell needs to be welded, and the heat generated during the welding process easily affects the strength of the surrounding material, causing the anti-explosion notch to break prematurely without reaching the preset internal pressure. For another example, during the subsequent strength safety test of the battery, the battery needs to be dropped from a high position, which also easily causes the anti-explosion notch of the battery shell to break after the drop and cannot be used continuously.

[0005] In a first aspect, an embodiment of the present application provides a battery shell, comprising a bottom plate and a surrounding plate arranged around the bottom plate; wherein the surrounding plate and the bottom plate jointly define a containing cavity with an opening, the opening and the bottom plate are oppositely arranged; the bottom plate has a center point, an anti-explosion notch is opened on the bottom plate, the anti-explosion notch has an inner edge closest to the center point and an outer edge farthest from the center point, the distance between the inner edge and the center point is greater than or equal to 1 / 2 of the radius of the bottom plate, and the distance between the outer edge and the center point is less than or equal to 4 / 5 of the radius of the bottom plate.

[0006] In a second aspect, an embodiment of the present application provides a battery, comprising the battery shell of the first aspect.

[0007] In a third aspect, an embodiment of the present application provides a battery pack, comprising the battery of the second aspect. ADVANTAGEOUS EFFECTS

[0008] For the battery shell provided by the embodiments of the present application, the explosion-proof notch is arranged at a position at least 1 / 2 radius away from the center point, so that the position where the explosion-proof notch is arranged can be avoided from being too close to the center point, thereby avoiding the problem that the heat generated by welding in the process of participating in welding affects the strength of the material at the position where the explosion-proof notch is arranged, and further causes the explosion-proof notch to easily break early. In addition, the explosion-proof notch is arranged in an area at 4 / 5 radius away from the center point, so that the problem that the explosion-proof notch breaks due to a large collision of the edge of the bottom plate in the subsequent strength safety test process can be avoided. Therefore, the battery shell provided by the present application can ensure the stability of the explosion-proof notch, and further ensure the use stability of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0009] FIG. 1 is a perspective view of a battery shell provided by an embodiment of the present application from a first perspective;

[0010] FIG. 2 is a perspective view of a battery shell provided by an embodiment of the present application from a second perspective;

[0011] FIG. 3 is a structural schematic diagram of a bottom plate according to some embodiments of the present application;

[0012] FIG. 4A is a structural schematic diagram of a bottom plate according to another embodiment of the present application;

[0013] FIG. 4B is a structural schematic diagram of a bottom plate according to still another embodiment of the present application;

[0014] FIG. 5 is a sectional view of a battery shell provided by an embodiment of the present application;

[0015] FIG. 6 is an enlarged structural schematic diagram of region F in FIG. 5.

[0016] Explanation of Reference Signs:

[0017] 10, bottom plate; 20, surrounding plate; 100, battery shell; 101, inner edge; 102, outer edge; 111, explosion-proof notch; 201, opening; 1001, sub-inner edge; 1002, sub-outer edge; 1110, explosion-proof sub-notch. Embodiments of the present application

[0018] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0019] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0020] In the description of the present embodiment, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used to distinguish in the description and have no special meaning.

[0021] After the explosion-proof notch is opened, the battery shell usually needs to be installed with a core package and subjected to battery strength safety performance test, etc.

[0022] In the related art, the core package needs to be welded to the area close to the center of the battery shell during installation. The heat in the welding process easily affects the strength of the surrounding material, resulting in that the explosion-proof notch breaks prematurely without reaching the preset internal pressure. In addition, the battery needs to be dropped from a high position during the subsequent strength safety test, which also easily causes the explosion-proof notch of the battery shell to break after falling and cannot be used continuously.

[0023] Based on this, the present embodiment provides a battery shell. As shown in FIG. 1, the battery shell 100 includes a bottom plate 10 and a surrounding plate 20 arranged around the bottom plate 10.

[0024] As shown in FIGS. 1 and 2, the surrounding plate 20 and the bottom plate 10 jointly define a containing cavity with an opening 201, and the opening 201 is opposite to the bottom plate 10. After surrounding the bottom plate 10, the inner surface of the surrounding plate 20 forms a chamber with two open ends, and the bottom plate 10 closes the opening at one end of the chamber. Therefore, the inner surface of the surrounding plate 20 and the surface of the bottom plate 10 close to the surrounding plate 20 jointly form the above-mentioned containing cavity with the opening 201. The containing cavity can contain the core package, and the battery shell 100 can provide good protection for the core package, thereby ensuring the stable work of the core package.

[0025] As shown in FIG. 1 and FIG. 3, the bottom plate 10 has a center point O, and the bottom plate 10 is provided with an explosion-proof notch 111. The explosion-proof notch 111 has an inner edge 101 closest to the center point O and an outer edge 102 farthest from the center point O. The explosion-proof notch 111 can have several edges, and among all the edges, the distance between the inner edge 101 and the center point O is the smallest, and the distance between the outer edge 102 and the center point O is the largest.

[0026] The distance L1 between the inner edge 101 and the center point O is greater than or equal to 1 / 2 of the radius R of the bottom plate 10, and the distance L2 between the outer edge 102 and the center point O is less than or equal to 4 / 5 of the radius R of the bottom plate 10.

[0027] Through the above arrangement, the explosion-proof notch 111 is arranged at a position at least 1 / 2 of the radius away from the center point O. In this way, the position where the explosion-proof notch 111 is arranged can be avoided to be too close to the center point O, so as to avoid the problem that the heat generated by welding during the welding process affects the material strength of the position where the explosion-proof notch 111 is arranged, and further causes the explosion-proof notch 111 to easily break early. In addition, the explosion-proof notch 111 is arranged in an area within 4 / 5 of the radius away from the center point O. In this way, the problem that the explosion-proof notch 111 breaks due to a large collision of the edge of the bottom plate 10 during the subsequent strength safety test of the battery can be avoided. Therefore, the battery shell provided by the present application can guarantee the stability of the explosion-proof notch 111, and further guarantee the stability of the battery.

[0028] In some examples, the ratio between the distance L1 between the inner edge 101 and the center point O and the radius R of the bottom plate 10 can be greater than or equal to 1 / 2 and less than or equal to 13 / 20. That is, 1 / 2≤L1 / R≤13 / 20. For example, the ratio can be 1 / 2, 3 / 5, 4 / 7, 5 / 8, 5 / 9, and 13 / 20, etc.

[0029] In some examples, the ratio between the distance L2 between the outer edge 102 and the center point O and the radius R of the bottom plate 10 can be greater than 13 / 20 and less than or equal to 4 / 5. That is, 13 / 20

[0030] In some embodiments, the distance L1 between the inner edge 101 and the center point O is greater than or equal to 3 / 5 of the radius R of the bottom plate 10, and the distance L2 between the outer edge 102 and the center point O is less than or equal to 7 / 10 of the radius R of the bottom plate 10.

[0031] In this case, the explosion-proof notch 111 is located farther from the edge of the bottom plate 10, thereby preventing the explosion-proof notch 111 from rupturing due to a large collision with the edge of the bottom plate 10 during the battery strength safety test. At the same time, the explosion-proof notch 111 is located farther from the center point O, thereby preventing the heat generated by the welding of the bottom plate 10 during the welding process from affecting the material strength of the location where the explosion-proof notch 111 is located, thereby preventing the explosion-proof notch 111 from rupturing prematurely.

[0032] In some embodiments, as shown in Figure 3, the explosion-proof score 111 includes an explosion-proof sub-score 1110, the sub-inner edge 1001 of the explosion-proof sub-score 1110 closest to the center point O serves as the above-mentioned inner edge 101, and the sub-outer edge 1002 of the explosion-proof sub-score 1110 farthest from the center point O serves as the above-mentioned outer edge 102.

[0033] In some examples, the explosion-proof sub-score 1110 can be located on one side of the center point O and have an open shape, such as a straight line or other shapes. When the explosion-proof sub-score 1110 is straight and extends toward the center point O, the edges of the explosion-proof sub-score 1110 at both ends of the extension direction serve as the inner edge 101 and outer edge 102, respectively.

[0034] In other examples, the explosion-proof sub-score 1110 can be enclosed around the center point O. For example, the explosion-proof sub-score 1110 can be square, circular, oval, heart-shaped, or other shapes. When the explosion-proof sub-score 1110 is circular and its center coincides with the center point O, the edges of the explosion-proof sub-score 1110 on opposite sides serve as the inner edge 101 and outer edge 102, respectively. When the explosion-proof sub-score 1110 is enclosed around the center point O, this helps ensure the continuity of the explosion-proof score 111. When the pressure in the battery casing is excessive, the explosion-proof score 111 can evenly rupture, thereby smoothly depressurizing the battery.

[0035] In other embodiments, as shown in Figures 4A and 4B, the explosion-proof scoring 111 includes a plurality of mutually spaced explosion-proof sub-scores 1110. That is, there is no continuity between any two explosion-proof sub-scores 1110. Each explosion-proof sub-score 1110 has a sub-inner edge 1001 closest to the center point O and a sub-outer edge 1002 farthest from the center point O. The sub-inner edge 1001 closest to the center point O among the multiple sub-inner edges 1001 serves as the inner edge 101, and the sub-outer edge 1002 farthest from the center point O among the multiple sub-outer edges 1002 serves as the outer edge 102.

[0036] In some examples, the plurality of explosion-proof sub-scores 1110 are arranged around the center point O. In this way, the plurality of explosion-proof sub-scores 1110 can be distributed relatively uniformly, so as to facilitate the explosion-proof sub-scores 1110 to break together, thereby ensuring the working stability of the explosion-proof score 111.

[0037] In some examples, for all the explosion-proof sub-scores 1110, at least part of the explosion-proof sub-scores 1110 are arranged in a ring array. In this way, the uniformity of the arrangement of the explosion-proof sub-scores 1110 can be improved, so as to facilitate the explosion-proof sub-scores 1110 to break together, thereby ensuring the working stability of the explosion-proof score 111.

[0038] For example, as shown in FIG. 4A, all the explosion-proof sub-scores 1110 are arranged in a ring array. In this case, the sub-inner edge 1001 of any explosion-proof sub-score 1110 can be the inner edge 101, and the sub-outer edge 1002 of any explosion-proof sub-score 1110 can be the outer edge 102.

[0039] For another example, as shown in FIG. 4B, part of the explosion-proof sub-scores 1110 are arranged in a ring array, and the other part of the explosion-proof sub-scores 1110 are located outside the part of the explosion-proof sub-scores 1110 and are also arranged in a ring array. That is, the two parts of the explosion-proof sub-scores 1110 are arranged around the center point O and are located at different circular positions. In this case, the sub-inner edge 1001 of the explosion-proof sub-score 1110 closer to the center point O can be the inner edge 101, and the sub-outer edge 1002 of the explosion-proof sub-score 1110 farther from the center point O can be the outer edge 102.

[0040] In some examples, the plurality of explosion-proof sub-scores 1110 can also be arranged at intervals away from the center point O.

[0041] In some examples, the width of the explosion-proof sub-score 1110 can be 1 mm. The width direction of the explosion-proof sub-score 1110 is perpendicular to the extension direction of the explosion-proof sub-score 1110. In the case where the explosion-proof score 111 includes one explosion-proof sub-score 1110, the width of the explosion-proof sub-score 1110 is also the width of the explosion-proof score 111.

[0042] The opening position of the explosion-proof notch 111 and the opening valve pressure (i.e. the pressure inside the battery shell when the explosion-proof notch 111 is opened) are tested, wherein the thickness of the surrounding plate 20 is 0.4 mm, the thickness of the bottom plate 10 is 0.6 mm, the distance between the groove bottom of the explosion-proof notch 111 and the other side surface of the bottom plate 10 is 0.1 mm, the width of the explosion-proof notch 111 is 1 mm, and the diameter of the bottom plate 10 is 26 mm; based on different distances between the inner edge 101 of the explosion-proof notch 111 and the center point O, the data in Table I and Table II are obtained:

[0043] Distance between inner edge and center point 4.5 mm 6 mm 6.5 mm 7.5 mm 9 mm Experimental value 11.611 Mpa 1.853 Mpa 1.867 Mpa 1.957 Mpa 1.875 Mpa Experimental value 21.592 Mpa 1.76 Mpa 1.858 Mpa 1.886 Mpa 1.895 Mpa Experimental value 31.69 Mpa 1.937 Mpa 1.934 Mpa 1.866 Mpa 1.827 Mpa Experimental value 41.527 Mpa 1.852 Mpa 1.886 Mpa 1.884 Mpa 2.013 Mpa Experimental value 51.62 Mpa 1.695 Mpa 1.893 Mpa 1.864 Mpa 1.851 Mpa Average value 1.608 Mpa 1.81 Mpa 1.887 Mpa 1.891 Mpa 1.892 Mpa

[0044] Table I

[0045] As can be seen from the data in Table I, when the distance L1 between the inner edge 101 of the explosion-proof notch 111 and the center point O increases from 4.5 mm to 6.5 mm (i.e. the ratio between the distance L1 and the radius R of the bottom plate 10 increases from 9 / 26 to 1 / 2), the opening valve pressure increases greatly. This indicates that when the inner edge 101 of the explosion-proof notch 111 is arranged in this range, the heat generated by welding during the welding process of the bottom plate 10 has a great influence on the explosion-proof notch 111, and thus the opening valve pressure changes greatly.

[0046] When the distance L1 between the inner edge 101 of the explosion-proof notch 111 and the center point O increases from 6.5 mm to 9 mm (i.e. the ratio between the distance L1 and the radius R of the bottom plate 10 increases from 1 / 2 to 9 / 13), the change trend of the opening valve pressure is very gentle. This indicates that when the inner edge 101 of the explosion-proof notch 111 is arranged in this range, the heat generated by welding during the welding process of the bottom plate 10 has a small influence on the explosion-proof notch 111, and thus the opening valve pressure changes little.

[0047] Distance between outer edge and center point 6.5mm 7.5mm 9mm 10.4mm 11.5mm Experiment 11.791Mpa 1.983Mpa 1.931Mpa 2.02Mpa 1.701Mpa Experiment 21.893Mpa 1.868Mpa 1.857Mpa 1.834Mpa 1.547Mpa Experiment 31.797Mpa 1.811Mpa 1.988Mpa 1.843Mpa 1.612Mpa Experiment 41.902Mpa 1.896Mpa 1.807Mpa 1.84Mpa 1.599Mpa Experiment 52.025Mpa 1.938Mpa 1.895Mpa 1.966Mpa 1.568Mpa Average 1.887Mpa 1.899Mpa 1.895Mpa 1.901Mpa 1.605Mpa

[0048] Table II

[0049] As can be seen from the data in Table II, when the distance L2 between the outer edge 102 of the explosion-proof notch 111 and the center point O increases from 6.5mm to 10.4mm (i.e. the ratio between the distance L2 and the radius R of the bottom plate 10 increases from 1 / 2 to 4 / 5), the change trend of the opening valve pressure is very gentle. This indicates that when the outer edge 102 of the explosion-proof notch 111 is arranged in this range, the impact of the collision of the edge of the bottom plate 10 on the explosion-proof notch 111 during the subsequent strength safety test of the battery is small, and thus the change of the opening valve pressure is small.

[0050] When the distance L2 between the outer edge 102 and the center point O increases from 10.4mm to 11.5mm (i.e. the ratio between the distance L1 and the radius R of the bottom plate 10 increases from 4 / 5 to 23 / 26), the opening valve pressure decreases greatly. This indicates that when the outer edge 102 of the explosion-proof notch 111 is arranged in this range, the impact of the collision of the edge of the bottom plate 10 on the explosion-proof notch 111 during the subsequent strength safety test of the battery is large, and thus the change of the opening valve pressure is large.

[0051] Therefore, for the explosion-proof notch 111, when the distance L1 between the inner edge 101 and the center point O is greater than or equal to 1 / 2 of the radius R of the bottom plate 10, and the distance L2 between the outer edge 102 and the center point O is less than or equal to 4 / 5 of the radius R of the bottom plate 10, the explosion-proof notch 111 has a relatively stable opening valve pressure, which is conducive to ensuring the stability of the battery in use.

[0052] In some embodiments, as shown in FIGS. 5 and 6, the explosion-proof notch 111 is located on one side surface of the bottom plate 10, and the explosion-proof notch 111 has a groove bottom, and the distance A1 between the groove bottom and the other side surface of the bottom plate 10 is greater than or equal to 0.03mm and less than or equal to 0.2mm.

[0053] In this way, the rupture of the explosion-preventing notch 111 is facilitated, so that the exhaust pressure relief is smoothly achieved.

[0054] For example, when the interval A1 is equal to 0.03 mm, the pressure relief of the battery is approximately 1.2 MPa. That is, when the pressure inside the battery is greater than or equal to 1.2 MPa, the explosion-preventing notch 111 will be ruptured, so that the pressure relief is achieved. When the interval A1 is equal to 0.2 mm, the pressure relief of the battery is approximately 2.5 MPa. That is, when the pressure inside the battery is greater than or equal to 2.5 MPa, the explosion-preventing notch 111 will be ruptured, so that the pressure relief is achieved. Therefore, the battery shell according to the present application can be set with a reasonable interval A1 according to the actual pressure relief requirement, so that stable pressure relief is achieved.

[0055] In some embodiments, the explosion-preventing notch 111 is located on the side of the bottom plate 10 close to the surrounding plate 20. In this way, the explosion-preventing notch 111 is located inside the battery, which is beneficial to improve the overall appearance of the battery, and also beneficial to avoid that the explosion-preventing notch 111 is easily mixed with foreign matters during use of the battery, so as to affect the working performance thereof.

[0056] In some embodiments, as shown in FIGS. 5 and 6, the explosion-preventing notch 111 is located on the side of the bottom plate 10 away from the surrounding plate 20. In this way, the explosion-preventing notch 111 is located outside the battery, so that the explosion-preventing notch 111 has sufficient space for manufacturing, which is beneficial to improve the manufacturing efficiency of the battery shell.

[0057] In some embodiments, as shown in FIG. 5, the ratio of the diameter D of the bottom plate 10 to the sum of the height h of the surrounding plate 20 and the thickness A2 of the bottom plate 10 is greater than or equal to 0.2 and less than or equal to 0.4. That is, 0.2≤D / (h+A2)≤0.4. In this case, the sum of the height h of the surrounding plate 20 and the thickness A2 of the bottom plate 10 is the height H of the battery shell 100, and 0.2≤D / H≤0.4.

[0058] The diameter D of the bottom plate 10 is adapted to the diameter of the core pack located in the accommodating cavity. The larger the diameter of the core pack, the greater the energy density thereof, and the greater the heat generated during working. In addition, the higher the height H of the battery shell 100, the greater the heat dissipation area thereof. Therefore, the diameter D of the bottom plate 10 and the height H of the battery shell 100 are set in the above ratio range, which is beneficial to ensure that the energy density and the heat dissipation capacity of the battery form a good balance, so that the battery has good working performance.

[0059] In some examples, the ratio between the diameter D of the bottom plate 10 and the height H of the battery shell 100 can be 0.2, 0.25, 0.3, 0.35, 0.4, etc., which is not limited in the present application.

[0060] In some embodiments, as shown in FIG. 5, the ratio of the thickness A2 of the bottom plate 10 to the thickness A3 of the surrounding plate 20 is greater than or equal to 1 and less than or equal to 2. That is, 1≤A2 / A3≤2.

[0061] In this way, the bottom plate 10 can have a relatively large thickness, which on the one hand facilitates the manufacture of the anti-explosion notch 111, and on the other hand can also ensure that the bottom plate 10 as a whole has good strength, avoiding damage during the strength safety test of the battery due to the manufacture of the anti-explosion notch.

[0062] In some examples, the ratio of the thickness A2 of the bottom plate 10 to the thickness A3 of the surrounding plate 20 can be 1, 1.2, 1.4, 1.6, 1.8, 2, etc., which is not limited in the present application.

[0063] In some embodiments, the materials of the bottom plate 10 and the surrounding plate 20 are the same. This is conducive to improving the consistency and stability of the battery shell 100, so that the battery shell 100 can withstand the thermal expansion and contraction of the core package to a certain extent, thereby ensuring the use stability of the battery.

[0064] In some examples, the materials of the bottom plate 10 and the surrounding plate 20 can be aluminum or steel.

[0065] For example, the materials of the bottom plate 10 and the surrounding plate 20 can be Al 3003, Al 3004, nickel-plated SPCC steel, or stainless steel. By using the above materials, the battery shell 100 can have considerable strength, corrosion resistance, and processability, which is conducive to subsequent battery manufacturing.

[0066] In some embodiments, the bottom plate 10 and the surrounding plate 20 are integrally formed. This can on the one hand improve the connection stability between the bottom plate 10 and the surrounding plate 20, thereby ensuring the overall strength of the battery shell 100, and on the other hand can also improve the sealing performance of the battery shell 100, thereby ensuring the working stability of the core package.

[0067] In the above specific manufacturing process of the battery shell 100, the manufacturing method of the battery shell 100 can include the following steps:

[0068] S10: The metal strip coil material is transported to the cup punching station, and the metal strip coil material is extruded and deformed by the mold of the cup punching station, and then cut off to form a cup-shaped initial material.

[0069] S20: The cup-shaped initial material is transported to a stretching station, and is continuously stretched by upper and lower molds to form a shell blank of a specified size.

[0070] S30: The shell blank is transported to a lineation station, and is extruded by upper and lower molds to form an anti-explosion lineation on a side of the bottom plate close to the surrounding plate or on a side of the bottom plate away from the surrounding plate, so as to form a quasi-shell.

[0071] S40: The quasi-shell is transported to a flattening station, and the bottom plate is flattened by extrusion of upper and lower molds. In this way, the product formed by the quasi-shell can be ensured to be uniform and flat in size.

[0072] S50: The quasi-shell after step S40 is transported to a cutting station, and the mouth of the quasi-shell is cut to form a flat opening.

[0073] By using the manufacturing method, the bottom plate 10 and the surrounding plate 20 can be integrally formed, and the anti-explosion lineation can be made, so that the production efficiency of the battery shell 100 can be improved.

[0074] Based on the above concept, some embodiments of the present application further provide a battery, which comprises the battery shell 100 according to any one of the above embodiments.

[0075] Since the battery comprises the battery shell 100, the battery has the technical effects of the battery shell 100, which will not be repeated here.

[0076] In some embodiments, the battery further comprises a core package located in the battery shell 100.

[0077] In some examples, the core package can comprise a positive electrode sheet, a negative electrode sheet, a separator, and a tab, etc.

[0078] For example, the core package can be a winding type battery cell, which is referred to as a winding core. In the manufacturing process, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked and then wound together to form the winding core.

[0079] For another example, the core package can also be a laminated winding core or other battery cells familiar to those skilled in the art, which are not limited in the present application.

[0080] Based on the above concept, some embodiments of the present application further provide a battery pack, which comprises the battery according to any one of the above embodiments.

[0081] Since the battery comprises the battery shell 100, the battery pack has the technical effects of the battery shell 100, which will not be repeated here.

Claims

1. A battery housing, comprising: base plate; as well as A surrounding plate arranged around the bottom plate; In which, the enclosure and the base plate jointly define a accommodating cavity with an opening, and the opening and the base plate are arranged relative to each other; the base plate has a center point, and an explosion-proof notch is provided on the base plate, and the explosion-proof notch has an inner edge closest to the center point and an outer edge farthest from the center point, and the distance between the inner edge and the center point is greater than or equal to 1 / 2 of the radius of the base plate, and the distance between the outer edge and the center point is less than or equal to 4 / 5 of the radius of the base plate.

2. The battery case according to claim 1, wherein The explosion-proof notch includes an explosion-proof sub-notch, the sub-inner edge of the explosion-proof sub-notch closest to the center point serves as the inner edge, and the sub-outer edge of the explosion-proof sub-notch farthest from the center point serves as the outer edge; or The explosion-proof notch includes a plurality of explosion-proof sub-notches spaced apart from each other, each explosion-proof sub-notch having a sub-inner edge closest to the center point and a sub-outer edge farthest from the center point, the sub-inner edge closest to the center point among the plurality of sub-inner edges serves as the inner edge, and the sub-outer edge farthest from the center point among the plurality of sub-outer edges serves as the outer edge.

3. The battery case according to claim 2, wherein: In the case that the explosion-proof notch includes a plurality of explosion-proof sub-notches spaced apart from each other, the plurality of explosion-proof sub-notches are arranged around the central point.

4. The battery case according to claim 1, wherein The explosion-proof notch is located on one side surface of the bottom plate, and the explosion-proof notch has a groove bottom. The distance between the groove bottom and the other side surface of the bottom plate is greater than or equal to 0.03 mm and less than or equal to 0.2 mm.

5. The battery case according to claim 4, wherein: The explosion-proof notch is located on a side of the bottom plate close to the enclosure, or the explosion-proof notch is located on a side of the bottom plate away from the enclosure.

6. The battery casing according to any one of claims 1 to 5, wherein: The ratio of the diameter of the bottom plate to the sum of the height of the enclosure plate and the thickness of the bottom plate is greater than or equal to 0.2 and less than or equal to 0.

4.

7. The battery case according to any one of claims 1 to 5, wherein: The ratio of the thickness of the bottom plate to the thickness of the enclosure plate is greater than or equal to 1 and less than or equal to 2.

8. The battery case according to any one of claims 1 to 5, wherein: The base plate and the enclosure plate are made of the same material.

9. A battery comprising: The battery casing according to any one of claims 1 to 8.

10. A battery pack comprising: The battery according to claim 9.

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