Battery shell, battery and battery pack

Abstract

The utility model provides a battery shell, a battery and a battery pack, relates to the technical field of batteries, and aims to solve the technical problem that an anti-explosion nick is easy to crack in advance due to unreasonable arrangement of the position of the anti-explosion nick in the related technology. The battery shell comprises 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, and the opening and the bottom plate are oppositely arranged; the bottom plate is provided with a center point, the bottom plate is provided with an anti-explosion nick, the anti-explosion nick is provided with 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 larger than or equal to 1 / 2 of the radius of the bottom plate. And the distance between the outer edge and the central point is smaller than or equal to 4 / 5 of the radius of the bottom plate.

Description

Technical Field

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

[0002] When the battery is at high temperature, overcharged or short-circuited, a large amount of gas will be generated inside, which will cause the gas pressure in the battery case to rise sharply. In order to prevent the battery from exploding, explosion-proof notches are usually set on the battery case so that the explosion-proof notches can rupture and release the pressure.

[0003] After the explosion-proof notch is opened, the battery shell usually needs to install a core pack and conduct battery strength and safety performance tests. In the related art, explosion-proof notches are often prone to premature rupture. For example, during the installation of the core pack, the area near the center of the battery shell needs to be welded. The heat during the welding process can easily affect the strength of the surrounding materials, causing the explosion-proof notch to rupture prematurely without reaching the preset internal pressure. For another example, during the subsequent strength and safety test of the battery, the battery needs to be dropped from a high position, which can easily cause the battery shell to rupture due to the explosion-proof notch after falling and become incapable of continued use. Utility Model Content

[0004] The embodiments of the utility model provide a battery housing, a battery and a battery pack, which can improve the technical problem in the related art that the location of the explosion-proof notch is unreasonable and prone to premature rupture.

[0005] In a first aspect, an embodiment of the utility model provides a battery shell, comprising a base plate and a surrounding plate arranged around the base plate; wherein the surrounding plate and the base plate jointly define a accommodating cavity having 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, wherein the explosion-proof notch has an inner edge closest to the center point and an outer edge farthest from the center point, and the spacing 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 spacing between the outer edge and the center point is less than or equal to 4 / 5 of the radius of the base plate.

[0006] In one embodiment, 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 is used as the inner edge, and the sub-outer edge of the explosion-proof sub-notch farthest from the center point is used as the outer edge.

[0007] In one embodiment, the explosion-proof notch comprises 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.

[0008] In one embodiment, a plurality of explosion-proof sub-scores are arranged around the central point.

[0009] In one embodiment, the explosion-proof notch is located on one side surface of the bottom plate, the explosion-proof notch has a groove bottom, and 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.

[0010] In one embodiment, 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.

[0011] In one embodiment, 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.

[0012] In one embodiment, a ratio of the thickness of the base plate to the thickness of the enclosure plate is greater than or equal to 1 and less than or equal to 2.

[0013] In one embodiment, the base plate and the enclosure plate are made of the same material.

[0014] In a second aspect, an embodiment of the present invention provides a battery, comprising the battery housing described in any embodiment of the first aspect.

[0015] In a third aspect, an embodiment of the present invention provides a battery pack, comprising the battery described in the second aspect.

[0016] Beneficial effects of the embodiments of the utility model:

[0017] For the battery case provided by the embodiment of the utility model, the explosion-proof notch is set at a position at least 1 / 2 radius away from the center point, so that the position where the explosion-proof notch is set can be avoided from being too close to the center point, thereby avoiding the heat generated by the welding during the welding of the bottom plate affecting the strength of the material at the position where the explosion-proof notch is set, thereby causing the explosion-proof notch to easily break in advance. In addition, the explosion-proof notch is set in an area of ​​4 / 5 radius from the center point, so that the battery can avoid the problem of large collisions at the edge of the bottom plate during subsequent strength safety tests, which may cause the explosion-proof notch to break. Therefore, the battery case provided by the present application can ensure the stability of the explosion-proof notch, and thus ensure the stability of the battery in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a three-dimensional schematic diagram of a battery housing provided by an embodiment of the utility model at a first viewing angle;

[0020] Figure 2 is a three-dimensional schematic diagram of a battery housing provided by an embodiment of the utility model at a second viewing angle;

[0021] Figure 3 is a schematic diagram of the structure of the bottom plate according to some embodiments of the utility model;

[0022] Figure 4A It is a schematic diagram of the structure of the bottom plate according to other embodiments of the utility model;

[0023] Figure 4B It is a structural schematic diagram of the bottom plate according to some other embodiments of the utility model;

[0024] Figure 5 It is a cross-sectional structural diagram of a battery housing provided by an embodiment of the utility model;

[0025] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of area F in the middle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0027] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", or "some examples" are intended to indicate that a specific feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0028] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0029] When describing some embodiments, the term "connected" and its derivative expressions may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0030] As used herein, "approximately" includes the stated values ​​and averages that are within an acceptable range of deviation from the particular value, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0031] After the explosion-proof notch is opened on the battery casing, it is usually necessary to install the core pack and conduct battery strength and safety performance tests.

[0032] In the related technology, the core pack needs to be welded near the center of the battery shell during installation. The heat from the welding process can easily affect the strength of the surrounding materials, causing the explosion-proof notch to rupture prematurely before the preset internal pressure is reached. In addition, during the subsequent strength safety test, the battery needs to be dropped from a high position, which can easily cause the explosion-proof notch of the battery shell to rupture after falling and make it unusable.

[0033] Based on this, the present application embodiment provides a battery housing, such as Figure 1 As shown, the battery housing 100 includes a base plate 10 and a surrounding plate 20 disposed around the base plate 10 .

[0034] like Figure 1 and Figure 2As shown, the enclosure 20 and the bottom plate 10 jointly define a receiving cavity with an opening 201, and the opening 201 and the bottom plate 10 are arranged opposite to each other. After the enclosure 20 surrounds the bottom plate 10, the inner surface of the enclosure 20 encloses a cavity with openings at both ends, and the bottom plate 10 closes the opening at one end of the cavity. Therefore, the inner surface of the enclosure 20 and the surface of the bottom plate 10 close to the side of the enclosure 20 together enclose the above-mentioned receiving cavity with an opening 201. The receiving cavity can accommodate the core package, and the battery housing 100 can provide good protection for the core package, thereby ensuring the stable operation of the core package.

[0035] like Figure 1 and Figure 3 As shown, the bottom plate 10 has a center point O, and an explosion-proof notch 111 is provided on the bottom plate 10. 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 may 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.

[0036] A 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 a 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 .

[0037] Through the above configuration, the explosion-proof notch 111 is set at a position at least 1 / 2 radius away from the center point O, so that the position where the explosion-proof notch 111 is set can be avoided from being too close to the center point O, thereby avoiding the heat generated by the welding during the welding of the bottom plate 10 to affect the material strength of the position where the explosion-proof notch 111 is set, thereby causing the explosion-proof notch 111 to easily break in advance. In addition, the explosion-proof notch 111 is set in an area of ​​4 / 5 radius from the center point, so that the problem of the explosion-proof notch 111 breaking due to a large collision at the edge of the bottom plate 10 during the subsequent strength safety test of the battery can be avoided. Therefore, the battery housing provided in the present application can ensure the stability of the explosion-proof notch 111, thereby ensuring the stability of the battery in use.

[0038] 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 may 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 may be 1 / 2, 3 / 5, 4 / 7, 5 / 8, 5 / 9, 13 / 20, and the like.

[0039] 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 may be greater than 13 / 20 and less than or equal to 4 / 5. That is, 13 / 20<L2 / R≤4 / 5. For example, the ratio may be 2 / 3, 3 / 4, 4 / 5, 5 / 7, 7 / 9, etc., which are not listed here one by one.

[0040] 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 base 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 base plate 10 .

[0041] In this case, the position where the explosion-proof notch 111 is opened is farther from the edge of the bottom plate 10, thereby avoiding the problem that the explosion-proof notch 111 is broken due to a large collision with the edge of the bottom plate 10 during the strength safety test of the battery; at the same time, the position where the explosion-proof notch 111 is opened is also farther from the center point O, thereby avoiding the problem that the heat generated by the welding during the welding of the bottom plate 10 affects the material strength of the position where the explosion-proof notch 111 is set, thereby causing the explosion-proof notch 111 to be easily broken in advance.

[0042] In some embodiments, Figure 3 As shown, the explosion-proof notch 111 includes an explosion-proof sub-notch 1110 , the sub-inner edge 1001 of the explosion-proof sub-notch 1110 closest to the center point O serves as the inner edge 101 , and the sub-outer edge 1002 of the explosion-proof sub-notch 1110 farthest from the center point O serves as the outer edge 102 .

[0043] In some examples, the explosion-proof sub-score 1110 may be located on one side of the center point O and be in an open shape, such as a straight line or other shapes. When the explosion-proof sub-score 1110 is in a straight line and its extension direction is toward the center point O, the edges of the explosion-proof sub-score 1110 at opposite ends are respectively used as the inner edge 101 and the outer edge 102.

[0044] In other examples, the explosion-proof sub-score 1110 may be in a closed shape around the center point O, for example, the explosion-proof sub-score 1110 may be in a square, circular, elliptical, heart-shaped, etc. When the explosion-proof sub-score 1110 is circular and the center of the explosion-proof sub-score 1110 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 the outer edge 102, respectively. When the explosion-proof sub-score 110 is in a closed shape around the center point O, it is helpful to ensure the continuity of the explosion-proof score 111. When the pressure in the battery shell is too high, the explosion-proof score 111 can be evenly cracked, thereby achieving smooth pressure relief of the battery.

[0045] In other embodiments, Figure 4A and Figure 4B As shown, the explosion-proof notch 111 includes a plurality of explosion-proof sub-notches 1110 spaced apart from each other. That is, there is no continuity between any two explosion-proof sub-notches 1110. Each explosion-proof sub-notch 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 plurality of sub-inner edges 1001 serves as the inner edge 101, and the sub-outer edge 1002 farthest from the center point O among the plurality of sub-outer edges 1002 serves as the outer edge 102.

[0046] In some examples, a plurality of explosion-proof sub-scores 1110 are arranged around the central point O. In this way, the plurality of explosion-proof sub-scores 1110 can be distributed relatively evenly, which can help these explosion-proof sub-scores 1110 to rupture together, thereby ensuring the working stability of the explosion-proof score 111 .

[0047] In some examples, for all explosion-proof sub-scores 1110, at least some of the explosion-proof sub-scores 1110 are arranged in a ring array, which is conducive to improving the uniformity of the position setting of the explosion-proof sub-scores 1110, so that these explosion-proof sub-scores 1110 can be ruptured together, thereby ensuring the working stability of the explosion-proof scores 111.

[0048] For example, Figure 4A As shown, all explosion-proof sub-scores 1110 are arranged in a circular array. In this case, the sub-inner edge 1001 of any explosion-proof sub-score 1110 can be used as the inner edge 101, and the sub-outer edge 1002 of any explosion-proof sub-score 1110 can be used as the outer edge 102.

[0049] Another example is Figure 4B As shown, some explosion-proof sub-scores 1110 are arranged in a circular array, and another part of the explosion-proof sub-scores 1110 are located outside the aforementioned part of the explosion-proof sub-scores 1110 compared to the center point O, and are also arranged in a circular array. That is, the two parts of the explosion-proof sub-scores 1110 are both around the center point O and 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 used as the above-mentioned inner edge 101, and the sub-outer edge 1002 of the explosion-proof sub-score 1110 farther from the center point O can be used as the above-mentioned outer edge 102.

[0050] In some examples, the plurality of explosion-proof sub-scores 1110 may also be spaced apart in a direction away from the center point O.

[0051] In some examples, the width of the explosion-proof sub-score 1110 may 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.

[0052] The opening position of the explosion-proof notch 111 and the valve opening pressure (i.e., the pressure inside the battery housing when the explosion-proof notch 111 is opened) were tested, wherein the thickness of the enclosure 20 was 0.4 mm, the thickness of the bottom plate 10 was 0.6 mm, the spacing between the bottom of the groove of the explosion-proof notch 111 and the other side surface of the bottom plate 10 was 0.1 mm, the width of the explosion-proof notch 111 was 1 mm, and the diameter of the bottom plate 10 was 26 mm; based on the different spacings between the inner edge 101 of the explosion-proof notch 111 and the center point O, the data in Tables 1 and 2 were obtained:

[0053]

[0054]

[0055] Table 1

[0056] It can be seen from the data in Table 1 that 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 valve opening pressure increases greatly. This means that when the inner edge 101 of the explosion-proof notch 111 is set within the above-mentioned area, the heat generated by the welding of the bottom plate 10 during the welding process has a greater impact on the explosion-proof notch 111, so the valve opening pressure changes greatly.

[0057] When the distance L1 between the inner edge 101 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 valve opening pressure is very gentle. This means that when the inner edge 101 of the explosion-proof notch 111 is set within the range of this area, the heat generated by the welding of the bottom plate 10 during the welding process has little effect on the explosion-proof notch 111, so the change of the valve opening pressure is small.

[0058]

[0059] Table 2

[0060] It can be seen from the data in Table 2 that when the distance L2 between the outer edge 102 of the explosion-proof notch 111 and the center point O increases from 6.5 mm to 10.4 mm (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 valve opening pressure is very gentle. This means that when the outer edge 102 of the explosion-proof notch 111 is set within the above-mentioned area, during the subsequent strength safety test of the battery, the collision at the edge of the bottom plate 10 has little effect on the explosion-proof notch 111, so the change of the valve opening pressure is small.

[0061] When the distance L2 between the outer edge 102 and the center point O increases from 10.4 mm to 11.5 mm (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 valve opening pressure decreases significantly. This means that when the outer edge 102 of the explosion-proof notch 111 is set within the range of this area, during the subsequent strength safety test of the battery, the collision at the edge of the bottom plate 10 has a greater impact on the explosion-proof notch 111, so the valve opening pressure changes significantly.

[0062] 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 valve opening pressure, which is beneficial to ensure the stability of battery use.

[0063] In some embodiments, Figure 5 and Figure 6 As shown, 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 a distance A1 between the groove bottom and the other side surface of the bottom plate 10 is greater than or equal to 0.03 mm and less than or equal to 0.2 mm.

[0064] Such an arrangement is conducive to the rupture at the position of the explosion-proof notch 111, thereby smoothly achieving exhaust pressure relief.

[0065] Exemplarily, the normal pressure relief of the battery is between 1.2Mpa and 2.5Mpa, and setting the spacing A1 within the above range is conducive to achieving pressure relief within the above pressure relief range. For example, when the spacing A1 is equal to 0.03mm, the pressure relief of the battery roughly corresponds to 1.2Mpa. That is to say, when the pressure inside the battery is greater than or equal to 1.2Mpa, the explosion-proof notch 111 will crack, thereby achieving pressure relief. When the spacing A1 is equal to 0.2mm, the pressure relief of the battery roughly corresponds to 2.5Mpa. That is to say, when the pressure inside the battery is greater than or equal to 2.5Mpa, the explosion-proof notch 111 will crack, thereby achieving pressure relief. Therefore, the battery housing of the present application can be set with a reasonable spacing A1 according to the actual pressure relief needs to achieve stable pressure relief.

[0066] In some embodiments, the explosion-proof notch 111 is located on one side of the bottom plate 10 close to the enclosure 20. In this way, the explosion-proof notch 111 is located inside the battery, which is beneficial to improving the overall aesthetics of the battery and also helps to prevent foreign matter from being easily mixed in the explosion-proof notch 111 during use of the battery, thereby affecting its working performance.

[0067] In some embodiments, Figure 5 and Figure 6 As shown, the explosion-proof notch 111 is located on the side of the bottom plate 10 away from the enclosure 20. In this way, the explosion-proof notch 111 is located outside the battery, so that the explosion-proof notch 111 has sufficient space for production, which is conducive to improving the production efficiency of the battery shell.

[0068] In some embodiments, Figure 5 As shown, the ratio of the diameter D of the bottom plate 10 to the sum of the height h of the enclosure 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. The sum of the height h of the enclosure 20 and the thickness A2 of the bottom plate 10 is the height H of the battery case 100. In this case, 0.2≤D / H≤0.4.

[0069] The diameter D of the bottom plate 10 is adapted to the diameter of the core package in the accommodating cavity. The larger the diameter of the core package, the greater its energy density, but the greater the heat generated during operation. In addition, the higher the height H of the battery housing 100, the larger its heat dissipation area. Therefore, setting the diameter D of the bottom plate 10 and the height H of the battery housing 100 within the above ratio range is conducive to ensuring a good balance between the energy density and heat dissipation capacity of the battery, so that the battery has good working performance.

[0070] In some examples, the ratio between the diameter D of the bottom plate 10 and the height H of the battery housing 100 may be 0.2, 0.25, 0.3, 0.35, 0.4, etc., which is not limited in the present application.

[0071] In some embodiments, Figure 5 As shown, the ratio of the thickness A2 of the bottom plate 10 to the thickness A3 of the enclosure plate 20 is greater than or equal to 1 and less than or equal to 2. That is, 1≤A2 / A3≤2.

[0072] This arrangement can ensure that the bottom plate 10 has a relatively large thickness, which is beneficial to the production of the explosion-proof notch 111 on the one hand, and can also ensure that the bottom plate 10 as a whole has good strength, avoiding damage during the battery strength safety test due to the production of the explosion-proof notch.

[0073] In some examples, the ratio of the thickness A2 of the base plate 10 to the thickness A3 of the enclosure plate 20 may be 1, 1.2, 1.4, 1.6, 1.8, 2, etc., which is not limited in the present application.

[0074] In some embodiments, the bottom plate 10 and the surrounding plate 20 are made of the same material, which is beneficial to improving the consistency and stability of the battery housing 100, so that the battery housing 100 can withstand a certain degree of thermal expansion and contraction of the core pack inside, thereby ensuring the stability of the battery.

[0075] In some examples, the base plate 10 and the enclosure plate 20 may be made of aluminum or steel.

[0076] For example, the material may be Al 3003, Al 3004, nickel-plated SPCC steel, or stainless steel.

[0077] By adopting the above materials, the battery housing 100 can have considerable strength, corrosion resistance and processability, which is beneficial to the subsequent production of batteries.

[0078] In some embodiments, the bottom plate 10 and the enclosure 20 are integrally formed. This can improve the connection stability between the bottom plate 10 and the enclosure 20, thereby ensuring the overall strength of the battery housing 100, and can also improve the sealing performance of the battery housing 100, thereby ensuring the working stability of the core pack.

[0079] In the specific manufacturing process of the battery housing 100, the manufacturing method of the battery housing 100 may include the following steps:

[0080] S10: The metal strip coil is conveyed to the cup punching station, the metal strip coil is extruded and deformed by a die of the cup punching station, and then cut off to form a cup-shaped initial material.

[0081] S20: The cup-shaped initial material is transported to the stretching station and continuously stretched by upper and lower dies to form a shell embryo of a specified size.

[0082] S30: The shell embryo is transported to the scoring station, and explosion-proof scoring is formed on the side of the bottom plate close to the enclosure or on the side of the bottom plate away from the enclosure through the upper and lower dies, so that the shell embryo forms a quasi-shell.

[0083] S40: The quasi-shell is transported to the flattening station, and the bottom plate is flattened by extrusion of the upper and lower dies. This ensures that the product size formed by the quasi-shell is uniform and flat.

[0084] S50: transporting the quasi-shell after step S40 to a cutting station, and cutting the mouth of the quasi-shell to form a smooth opening.

[0085] By adopting the above manufacturing method, the bottom plate 10 and the surrounding plate 20 can be integrally formed, and the explosion-proof notches can be made, which can improve the production efficiency of the battery housing 100.

[0086] Based on the above inventive concept, some embodiments of the present application further provide a battery, which includes the battery housing 100 described in any of the above embodiments.

[0087] Since the battery has the battery housing 100 , the battery has the technical effects possessed by the battery housing 100 , which will not be described in detail herein.

[0088] In some embodiments, the battery further includes a core pack located within the battery housing 100 .

[0089] In some examples, the core package may include a positive electrode sheet, a negative electrode sheet, a separator, and a tab, etc.

[0090] For example, the core package may be a wound-type battery cell, referred to as a roll core. During the manufacturing process, the positive electrode sheet, the separator, and the negative electrode sheet are stacked in sequence and then rolled together to form a roll core.

[0091] For another example, the core package may also be a laminated core or other battery cells familiar to those skilled in the art, which is not limited in the present application.

[0092] Based on the above-mentioned inventive concept, some embodiments of the present application further provide a battery pack, which includes the battery described in any of the above-mentioned embodiments.

[0093] Since the battery has the battery housing 100 , the battery pack has the technical effects possessed by the battery housing 100 , which will not be described in detail herein.

[0094] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery housing, characterized in that: include: Base plate; as well as A surrounding plate arranged around the bottom plate; Wherein, the enclosure and the bottom plate jointly define a accommodating cavity with an opening, and the opening and the bottom plate are arranged relative to each other; the bottom plate has a center point, and an explosion-proof notch is opened on the bottom 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 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.

2. The battery housing according to claim 1, characterized in that: 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 is used as the inner edge, and the sub-outer edge of the explosion-proof sub-notch farthest from the center point is used as the outer edge; or, The explosion-proof notch comprises 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 being the inner edge, and the sub-outer edge farthest from the center point among the plurality of sub-outer edges being the outer edge.

3. The battery housing according to claim 2, characterized in that: A plurality of explosion-proof sub-scores are arranged around the central point.

4. The battery housing according to claim 1, characterized in that: The explosion-proof notch is located on one side surface of the bottom plate, and the explosion-proof notch has a groove bottom, and a 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 casing according to claim 4, characterized in that: 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 housing according to any one of claims 1 to 5, characterized in that: 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 housing according to any one of claims 1 to 5, characterized in that: The ratio of the thickness of the base 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 housing according to any one of claims 1 to 5, characterized in that: The base plate and the enclosure plate are made of the same material.

9. A battery, characterized in that: include: A battery casing as claimed in any one of claims 1 to 8.

10. A battery pack, characterized in that: include: The battery as claimed in claim 9.

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