Battery explosion-proof housing, shell and battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery explosion-proof shell, a housing and a battery. The explosion-proof shell has an explosion-proof groove on the outer surface of the bottom wall, and a plurality of emission grooves are arranged on the circumferential side of the central groove and are in communication with the central groove, and each emission groove extends from the direction of the central groove to the edge direction of the bottom wall. Not only can the force on the bottom wall of the explosion-proof shell be evenly distributed, but also the area of the explosion-proof groove can be increased to some extent, and the gas discharge efficiency in the battery can be improved. The thickness Tx of the bottom wall at the explosion-proof groove has at least one continuous value interval and / or one discontinuous value interval. When the internal pressure of the battery rapidly rises, the bottom wall is preferentially broken at the region corresponding to the minimum value of Tx to form a pressure relief port, and the connected part is sequentially opened under the impact of the gas, so that the opening area of the pressure relief port gradually increases, the gas discharge efficiency is improved, and the safety of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an explosion-proof housing, outer shell, and battery for use in batteries. Background Technology

[0002] Safety is one of the most important technical indicators of lithium batteries. Under extreme conditions, such as internal short circuits, thermal runaway of the cell, external compression, or puncture, the internal temperature and pressure of the battery rise rapidly. If the internal pressure cannot be released in time, the lithium battery may rupture due to excessive expansion, or even explode, seriously threatening safety. To ensure the safety of lithium batteries, explosion-proof structures are usually integrated into the battery casing to directionally release gas inside the battery in case of overpressure, preventing explosion. The casing typically includes a shell and a cover assembly. The shell is a shell-like structure closed at one end and open at the other. The cover assembly is sealed and installed at the open end of the shell. The common explosion-proof structures in the casing are mainly divided into two types: one is an explosion-proof structure integrated into the cover assembly of the casing; the other is an explosion-proof structure integrated into the shell of the casing.

[0003] Regarding explosion-proof structures integrated into the housing, related technologies mainly provide two design approaches, as follows: First, the explosion-proof structure is set on the bottom wall of the housing, for example, ... Figure 1 The diagram shows an annular groove 1000 provided on the bottom wall of the housing, which can serve as an explosion-proof structure; for example, such as... Figure 2 The diagram shows a straight groove 2000 on the bottom wall of the casing, which can serve as an explosion-proof structure. Alternatively, an explosion-proof structure can be provided on the side wall of the casing, for example... Figure 3 The diagram shows a slot opened on the side wall of the housing, and the slot is covered by a sheet 3000. This structure can serve as an explosion-proof structure.

[0004] However, Figure 1 The annular groove 1000 shown in the figure mainly serves the purpose of expanding outward under pressure when the battery expands due to overpressure. This allows for some leeway for the deformation of the casing, but it cannot achieve the effect of preferential rupture and directional pressure relief. Figure 2 The one-line groove 2000 shown can preferentially rupture when the battery expands under overpressure to achieve a directional pressure relief effect. However, the one-line groove 2000 is an off-center structure and the pressure relief port is small, so it cannot achieve the effect of rapid pressure relief. Moreover, the one-line groove 2000 makes the bottom wall of the casing prone to uneven stress, resulting in poor pressure relief stability. Figure 3 The sidewall sheet 3000 shown needs to be slotted in the shell and then welded to fix it, which increases the complexity of the process. Not only is the welding cost high, but the opening in the sidewall reduces the strength of the sidewall, making it unable to withstand external extrusion and impact.

[0005] This section is intended to provide background or context for embodiments of this application. The description herein is not intended to imply that it is prior art. Utility Model Content

[0006] The purpose of this application is to solve or at least mitigate some or all of the aforementioned problems. Therefore, the purpose of this application is to provide an explosion-proof housing, casing, and battery for batteries, which can solve the problems of bulging and explosion caused by internal pressure imbalance in batteries, reduce the risk of thermal failure, and improve the safety and stability of batteries.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In a first aspect, this application provides an explosion-proof housing for a battery, including a bottom wall and side walls connected to and surrounding the periphery of the bottom wall. The outer surface of the bottom wall has an explosion-proof groove, and the thickness of the bottom wall at the explosion-proof groove is Tx. The value of Tx has at least a continuously varying range and / or a discontinuous range. The explosion-proof groove includes:

[0009] Central groove;

[0010] The emission slots are arranged around the periphery of the central slot and are connected to the central slot, and each emission slot extends from the direction of the central slot toward the edge of the bottom wall.

[0011] As an optional embodiment of the explosion-proof housing for the battery, the outer surface of the bottom wall has a boss, the inner surface of the bottom wall corresponding to the boss is a recess, and the explosion-proof groove is located within the outer contour range of the boss.

[0012] As an optional embodiment of the explosion-proof housing for the battery, the bottom wall is circular in shape and has an outer diameter of D4; the boss is circular in shape and has an outer diameter of D3, wherein 0.6D4≤D3≤0.85D4.

[0013] As an optional embodiment of the explosion-proof housing for the battery, the thickness of the bottom wall at the boss is T1, and the thickness of the bottom wall in the area outside the boss is T2, wherein 0.9T1≤T2≤1.2T1.

[0014] As an optional embodiment of the explosion-proof housing for the battery, the thickness of the sidewall is T3, wherein 0.5T1≤T3≤0.9T1.

[0015] As an optional solution for the explosion-proof housing for the battery, the minimum value of Tx is T4, where 0.15T1≤T4≤0.50T1.

[0016] As an optional embodiment of the explosion-proof housing for the battery, the thickness variation trend of the bottom wall at the central groove is the same as the thickness variation trend of the bottom wall at the emission groove.

[0017] As an optional embodiment of the explosion-proof housing for the battery, the longitudinal section S1 of the central groove at the center line Y1 perpendicular to its width direction is an axisymmetric figure; and / or

[0018] The longitudinal cross-sectional shape S2 of the launch slot at the center line Y2 perpendicular to its width direction is an axisymmetric shape.

[0019] As an optional embodiment of the explosion-proof housing for the battery, in the pattern S1, the value of Tx has at least two ranges of variation from its center line Y1 in the direction away from the center line Y1, wherein the first range corresponds to a groove width of X11, where 0.25T1≤X11≤0.70T1; and / or

[0020] In the figure S2, from its center line Y2 in the direction away from the center line Y2, the value of Tx has at least two ranges of value variation, where the first range corresponds to the groove width X21, where 0.25T1≤X21≤0.70T1.

[0021] As an optional embodiment of the explosion-proof housing for the battery, in the pattern S1, from its center line Y1 in a direction away from the center line Y1, the value of Tx has at least three ranges of variation, wherein the groove width corresponding to the third range is X12, where 1.50T1≤X12≤2.70T1; and / or

[0022] In the figure S2, from its center line Y2 in the direction away from the center line Y2, the value of Tx has at least three ranges of value variation, where the width of the groove corresponding to the third range is X22, and 1.50T1≤X22≤2.70T1.

[0023] As an optional solution for the explosion-proof housing for the battery, the thickness of the bottom wall in the corresponding region of the third interval is T5, wherein 0.60T1≤T5≤1.3T1.

[0024] As an optional embodiment of the explosion-proof housing for the battery, in the figure S1, the angle between the inner wall of the groove corresponding to the second interval and the center line Y1 is θ11, where 45°≤2θ11≤150°; and / or

[0025] In the figure S2, the angle between the inner wall of the groove corresponding to the second interval and the center line Y2 is θ21, where 45°≤2θ21≤150°.

[0026] As an optional solution for the explosion-proof housing for the battery, X11 is the same as X21; and / or

[0027] X12 is the same as X22; and / or

[0028] θ11 is the same as θ21.

[0029] As an optional embodiment of the explosion-proof housing for the battery, the central groove extends in a straight line; the emission groove extends in a straight line.

[0030] As an optional embodiment of the explosion-proof housing for the battery, the length of the central groove in the region corresponding to the maximum value of Tx is X3, and the length of the emission groove in the region corresponding to the minimum value of Tx is X4; wherein, 0.1X4≤X3≤0.7X4.

[0031] As an optional solution for the explosion-proof housing for the battery, the number of the emission slots ranges from 3 to 8.

[0032] As an optional embodiment of the explosion-proof housing for the battery, the explosion-proof groove is arranged in an axisymmetric shape on the bottom wall.

[0033] As an optional embodiment of the explosion-proof housing for the battery, the inner surface of the explosion-proof groove is composed of regularly connected planes; or

[0034] The inner surface of the explosion-proof groove is composed of regularly connected planes and curved surfaces; or

[0035] The inner surface of the explosion-proof groove is composed of regularly connected curved surfaces.

[0036] Secondly, this application provides a housing, including a cover assembly and an explosion-proof housing for batteries as described in any of the preceding claims, wherein an opening is formed at one end of the sidewall away from the bottom wall, and the cover assembly is sealed over the opening.

[0037] Thirdly, this application provides a battery including a cell and a casing as described above, wherein the cell is installed within the casing.

[0038] The beneficial effects of this application are as follows:

[0039] The explosion-proof housing provided in this application has an explosion-proof groove on the outer surface of its bottom wall. The explosion-proof groove includes a central groove and emission grooves. Several emission grooves surround the central groove and are connected to it. Each emission groove extends from the direction of the central groove towards the edge of the bottom wall. This not only makes the bottom wall of the explosion-proof housing uniformly stressed, but also increases the area of ​​the explosion-proof groove to a certain extent, improving the gas discharge efficiency inside the battery. In addition, the thickness of the bottom wall at the explosion-proof groove is Tx. The value of Tx has at least one continuously varying range and / or one discontinuously varying range. When the internal pressure of the battery rises rapidly, the bottom wall preferentially ruptures at the region corresponding to the minimum value of Tx to form a pressure relief port. Then, the part connected to this region is sequentially expanded under the impact of the gas, so that the opening area of ​​the pressure relief port gradually increases, further improving the gas discharge efficiency, preventing the explosion-proof housing from exploding under the action of high-pressure gas, and improving the safety of the battery.

[0040] The casing and battery provided in this application, by applying the aforementioned explosion-proof casing, can solve the problems of swelling and explosion caused by internal pressure imbalance of the battery, reduce the risk of thermal failure, and improve the safety and stability of the battery. Attached Figure Description

[0041] Figure 1 This is a structural schematic diagram of an explosion-proof battery casing provided by relevant technologies.

[0042] Figure 2 This is a structural schematic diagram of an explosion-proof battery casing provided by relevant technologies.

[0043] Figure 3 This is a structural schematic diagram of an explosion-proof battery casing provided by relevant technologies.

[0044] Figure 4 This is a cross-sectional schematic diagram of the explosion-proof housing for batteries provided in the embodiments of this application.

[0045] Figure 5 This is a schematic diagram of the structure of the explosion-proof housing for batteries provided in the embodiments of this application.

[0046] Figure 6 This is a bottom view of the bottom wall provided in an embodiment of this application.

[0047] Figure 7 yes Figure 6 A partial sectional view at point B-B.

[0048] Figure 8 yes Figure 7 A partial enlarged view of the explosion-proof enclosure.

[0049] Figure 9 This is a schematic diagram showing the relationship between the bottom wall outer diameter D4 and the boss outer diameter D3 provided in the embodiments of this application.

[0050] Figure 10 This is a schematic diagram provided in the embodiments of this application when D3 < 0.60D4.

[0051] Figure 11 This is a schematic diagram provided in an embodiment of this application when D3 > 0.85D4.

[0052] Figure 12 This is a cross-sectional schematic diagram of the explosion-proof groove at the launch groove (or center groove) of the first example provided in the embodiments of this application.

[0053] Figure 13 This is a cross-sectional view of the explosion-proof slot at the launch slot (or center slot) of the second example provided in the embodiments of this application.

[0054] Figure 14 This is a cross-sectional view of the explosion-proof slot at the launch slot (or center slot) of the third example provided in the embodiments of this application.

[0055] Figure 15 This is a cross-sectional view of the explosion-proof slot at the launch slot (or center slot) of the fourth example provided in the embodiments of this application.

[0056] Figure 16 This is a cross-sectional view of the explosion-proof groove at the launch groove in the fifth example provided in the embodiments of this application.

[0057] Figure 17 This is a schematic diagram showing the layout relationship between the central slot and the launching slot of the explosion-proof slot provided in the embodiments of this application.

[0058] Figure 18 This is a schematic diagram of the deformation of the explosion-proof housing provided in the embodiment of this application under internal pressure.

[0059] Figure 19 This is a schematic diagram of the structure of the explosion-proof housing provided in this application embodiment, which disperses pressure under external pressure.

[0060] In the picture:

[0061] 1000, Annular groove; 2000, One-line groove; 3000, Thin sheet; 100, Explosion-proof housing; 200, Cover plate; 300, Pole post; 400, Battery cell; 10, Bottom wall; 101, Explosion-proof groove; 102, Boss; 103, Recess; 20, Side wall; 1, Center groove; 2, Emission groove. Detailed Implementation

[0062] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0063] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0066] like Figures 4 to 5 As shown, this application provides a battery including a cell 400 and a casing. The cell 400 is installed inside the casing, which is filled with electrolyte. The battery is a cylindrical battery, and the casing has a cylindrical shell structure. Furthermore, the cell 400 can be a wound cell or a carbon-coated cell.

[0067] This application also provides an enclosure, which includes a cover assembly and an explosion-proof housing 100. The explosion-proof housing 100 includes a bottom wall 10 and a side wall 20 connected to and surrounding the periphery of the bottom wall 10. An opening is formed at one end of the side wall 20 away from the bottom wall 10, and the cover assembly is sealed at the opening.

[0068] Furthermore, the cover assembly includes a cover plate 200 and a terminal post 300. The cover plate 200 is circular in shape and is sealed and installed at the opening of the explosion-proof housing 100. The terminal post 300 is installed on the cover plate 200, with one end of the terminal post 300 located inside the explosion-proof housing 100 and electrically connected to the battery cell 400, and the other end of the terminal post 300 located outside the explosion-proof housing 100. The cover plate 200 and the explosion-proof housing 100 can be sealed together by welding.

[0069] When the internal temperature and pressure of a battery rise rapidly, if the internal pressure cannot be released in time, the battery may rupture due to excessive expansion, or even explode, seriously threatening safety.

[0070] Based on the above issues, such as Figures 6 to 8 As shown, the explosion-proof housing 100 provided in this application has an explosion-proof groove 101 on the outer surface of its bottom wall 10. The explosion-proof groove 101 includes a central groove 1 and an emission groove 2. A plurality of emission grooves 2 are arranged around the periphery of the central groove 1 and are connected to the central groove 1. Each emission groove 2 extends from the direction of the central groove 1 towards the edge of the bottom wall 10. This not only makes the bottom wall 10 of the explosion-proof housing 100 uniformly stressed, but also increases the area of ​​the explosion-proof groove 101 to a certain extent and improves the gas discharge efficiency inside the battery.

[0071] The explosion-proof housing 100 is made of stainless steel, such as austenitic stainless steel, high-alloy ultra-pure ferritic stainless steel, and low-carbon austenitic stainless steel. Compared with carbon steel, stainless steel has better plasticity and thermal stability, which can ensure that the explosion-proof housing 100 is stable and does not crack under normal pressure and can release pressure stably during depressurization.

[0072] Furthermore, the thickness of the bottom wall 10 at the explosion-proof groove 101 is Tx. The value of Tx has at least one continuously varying range and / or one discontinuously varying range. When the internal pressure of the battery rises rapidly, the bottom wall 10 will preferentially rupture at the region corresponding to the minimum value of Tx to form a pressure relief port. Then, the part connected to this region will be sequentially expanded under the impact of the gas, so that the opening area of ​​the pressure relief port gradually increases, further improving the gas discharge efficiency, preventing the explosion-proof casing 100 from exploding under the action of high-pressure gas, and improving the safety of the battery.

[0073] It should be noted that, in this application, "continuous change in thickness Tx" refers to a smooth, gradual transition of thickness without interruption during the change process, with minimal thickness differences between adjacent positions and no sudden jumps or interruptions, such as a linear or nonlinear change in thickness. "Discontinuous change in thickness Tx" refers to a sudden and significant jump in thickness at a certain position, with obvious thickness differences between adjacent regions and a clear "boundary," such as a step-like change in thickness.

[0074] In one embodiment, the explosion-proof groove 101 can be integrally formed with the explosion-proof housing 100 by stamping. Compared with turning or milling processing methods, this method has the advantages of simple manufacturing, low cost and good consistency. Further, in the stamping forming process of the explosion-proof groove 101, stamping is performed from the outer surface of the bottom wall 10 toward the direction where the inner surface of the bottom wall 10 is located. Therefore, the explosion-proof groove 101 forms a groove-shaped structure on the outer surface of the bottom wall 10, and forms an inwardly extending protrusion structure on the inner surface of the bottom wall 10. In other words, the longitudinal cross-sectional shape of the explosion-proof groove 101 is substantially "Ω"-shaped, which enables safe, efficient and stable pressure relief, can solve the problems of swelling and explosion caused by internal pressure imbalance of the battery, reduces the risk of thermal failure, and improves the safety and stability of the battery. In addition, this structure can also preferentially disperse external extrusion pressure and impact force evenly, and prevent the explosion-proof housing 100 from deforming.

[0075] As shown in Figure 8 in combination with Figure 7 , the bottom wall 10 is stamped from its inner surface to its outer surface to form a boss 102, and the explosion-proof groove 101 is located within the outer contour range of the boss 102. The thickness of the bottom wall 10 at the boss 102 is T1, and the thickness of the bottom wall 10 in the area outside the boss 102 is T2, wherein 0.9T1≤T2≤1.2T1; for example, T2 can be 0.9T1, 0.91T1, 0.92T1, 0.93T1, 0.94T1, 0.95T1, 0.96T1, 0.97T1, 0.98T1, 0.99T1, 1.0T1, 1.1T1, 1.2T1, etc. In addition, the thickness of the side wall 20 is T3, and 0.5T1≤T3≤0.9T1. For example, T3 can be 0.50T1, 0.55T1, 0.60T1, 0.65T1, 0.70T1, 0.75T1, 0.80T1, 0.85T1, 0.90T1, and T3 is preferably 0.7T1. This is because the battery capacity is positively correlated with the internal space of the explosion-proof housing 100. In order to increase the internal space of the battery, the thickness T3 of the side wall 20 is reduced as much as possible. However, when the thickness T3 of the side wall 20 is less than 0.5T1, the explosion-proof housing 100 is prone to cracking, wrinkling or uneven thickness during the existing stretching process, which brings extremely high process difficulty. Meanwhile, the mechanical strength of the explosion-proof housing 100 decreases significantly. During battery assembly or use, the housing is prone to deformation or cracking due to external force, the welding and sealing of the thin-walled part become more difficult, and the manufactured battery also has the risk of high-temperature swelling and corrosion.

[0076] Further, the minimum value of Tx is T4, wherein 0.15T1≤T4≤0.50T1. For example, T4 can be 0.15T1, 0.2T1, 0.25T1, 0.30T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, etc., and 0.20T1 is preferred.

[0077] In one embodiment, such as Figures 9 to 11 As shown, the bottom wall 10 is circular in shape, and its outer diameter is D4; the boss 102 is also circular in shape, and its outer diameter is D3, wherein 0.6D4≤D3≤0.85D4. For example, D3 can be 0.61D4, 0.62D4, 0.63D4, 0.64D4, 0.65D4, 0.66D4, 0.67D4, 0.68D4, 0.69D4, 0.7D4, 0.71D4, 0.72D4, 0.73D4, 0.74D4, 0.75D4, 0.76D4, 0.77D4, 0.78D4, 0.79D4, 0.8D4, 0.81D4, 0.82D4, 0.83D4, 0.84D4, etc., with 0.70D4 being the preferred value. This design serves several purposes. First, it ensures sufficient internal space for the explosion-proof housing 100, thereby increasing the energy density of the battery. Second, it enhances the structural strength of the bottom wall 10 and side walls 20, preventing deformation during assembly of the explosion-proof housing 100 and the cover plate assembly. Third, the inner surfaces of the bottom wall 10 and the protrusion 102 form a recess 103, which guides the gas inside the explosion-proof housing 100, causing the gas to accumulate in the area of ​​the explosion-proof groove 101, making the weak areas of the explosion-proof groove 101 more prone to rupture.

[0078] See Figure 10 As shown, when D3 < 0.60D4, the diameter of boss 102 decreases, the area outside boss 102 increases, and the support surface of the bottom wall 10 in contact with the cell 400 increases. However, the corresponding internal space decreases, the pressure relief guiding effect decreases, and the corresponding capacity and pressure relief effect decrease. Figure 11 As shown, when D3 > 0.85D4, the diameter of the boss 102 increases, and the diameter of the area outside the boss 102 is almost 0. The bearing area of ​​the bottom wall 10 end face is small, and the compressive strength of the bottom wall 10 decreases. During the assembly of the explosion-proof housing 100 and the cover plate assembly, the side wall 20 of the explosion-proof housing 100 and the explosion-proof groove 101 of the bottom wall 10 are easily damaged. At the same time, the recess 103 on the inner surface of the bottom wall 10 almost fills the entire bottom wall 10, so that the battery cannot play a role in guiding the internal pressure when generating gas, and the pressure relief effect is weakened.

[0079] Based on the inventive concept that "the thickness Tx of the bottom wall 10 at the explosion-proof groove 101 has at least one continuously varying numerical range and / or one discontinuously varying numerical range," in one embodiment, such as Figures 12 to 16 Combination Figure 6As shown, the inner groove wall of the explosion-proof groove 101 is arranged in a substantially stepped shape, and the thickness variation trend of the bottom wall 10 at the central groove 1 is the same as that of the bottom wall 10 at the emission groove 2. The thickness of the region corresponding to the explosion-proof groove 101 changes in a gradient, and the weak point therein ruptures, so that gas is automatically discharged through the explosion-proof groove 101, which avoids the problem that the battery explodes or causes secondary hazards due to excessive air pressure.

[0080] Further, the longitudinal cross-sectional pattern S1 of the central groove 1 at the center line Y1 perpendicular to the width direction thereof is an axisymmetric pattern; the longitudinal cross-sectional pattern S2 of the emission groove 2 at the center line Y2 perpendicular to the width direction thereof is an axisymmetric pattern, and the shape of the pattern S1 is the same as that of the pattern S2. Further, the shapes of S1 and S2 are substantially ji-shaped.

[0081] In order to conveniently describe the variation of the thickness Tx of the bottom wall 10 at the explosion-proof groove 101, it is assumed that Figures 12 to 16 are all the longitudinal cross-sectional pattern S2 of the emission groove 2 at the center line Y2 perpendicular to the width direction thereof. Since the shape of the longitudinal cross-sectional pattern S2 is axially symmetric centered on the center line Y2, only the variation of the thickness Tx of the longitudinal cross-section located on one side of the center line Y2 is analyzed. It can be understood that, Figures 12 to 16 can also represent the longitudinal cross-sectional pattern S1 of the central groove 1 at the center line Y1 perpendicular to the width direction thereof.

[0082] In Figure 12 the illustrated example, the critical points in different numerical variation intervals of Tx are labeled, the intersection of the center line Y2 and the longitudinal cross-sectional pattern S2 is marked as W10, and then the critical points in different numerical variation intervals are sequentially marked as W10, W11, W12, W13, W14 in a direction away from the center line Y2. The variation trend of Tx from the center line Y2 in the direction away from the center line Y2 is specifically as follows:

[0083] 1) In the first interval from W10 to W11, the value of Tx remains unchanged as T4 in the direction away from the center line Y2, and the thickness Tx of the bottom wall 10 at this position is the smallest. In the first interval, the inner wall of the explosion-proof groove 101 is a flat surface, and the inner surface of the bottom wall 10 corresponding to this interval is a flat surface. In addition, the in-groove width of the explosion-proof groove 101 in the region corresponding to the first interval is X21, and the thickness of the bottom wall 10 at the boss 102 is T1, wherein 0.25T1≤X21≤0.70T1, for example, X21 can take values of 0.25T1, 0.30T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, 0.55T1, 0.60T1, 0.65T1, 0.70T1, etc., preferably 0.40T1.

[0084] 2) Within the second interval W11 to W12, the value of Tx increases linearly away from the center line Y2. Within this second interval, the inner wall of the explosion-proof groove 101 is an inclined plane, while the inner surface of the bottom wall 10 corresponding to this second interval is a plane. The angle between the inner wall of the groove corresponding to this second interval (i.e., the aforementioned inclined plane) and the center line Y2 is θ21. The range of 2θ21 is 45° ≤ 2θ21 ≤ 150°. For example, 2θ21 can be 45°, 50°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 120°, 130°, 140°, 150°, etc., with 60° being the preferred value.

[0085] 3) Within the third interval from W12 to W13, the value of Tx remains unchanged in the direction away from the center line Y2, meaning the thickness T5 of the bottom wall 10 in the area corresponding to the step surface remains unchanged. The inner wall of the explosion-proof groove 101 forms a step surface within this third interval, and the inner surface of the bottom wall 10 corresponding to this third interval is planar. The value range of T5 is: 0.60T1≤T5≤1.3T1. T5 can take values ​​such as 0.60T1, 0.65T1, 0.70T1, 0.75T1, 0.80T1, 0.85T1, 0.90T1, 0.95T1, 1.0T1, 1.1T1, 1.15T1, 1.2T1, 1.25T1, 1.3T1, etc., with 0.80T1 being preferred. Furthermore, the maximum width of the explosion-proof groove 101 in the corresponding area of ​​the three intervals is X22, which is twice the distance between W13 and W10. Among them, 1.50T1≤X22≤2.70T1, for example, X22 can take values ​​of 1.55T1, 1.60T1, 1.65T1, 1.70T1, 1.75T1, 1.80T1, 1.85T1, 1.90T1, 1.95T1, 2.0T1, 2.1T1, 2.2T1, 2.2T1, 2.4T1, 2.5T1, 2.6T1, 2.7T1, etc., with 1.80T1 being preferred.

[0086] 4) The value of Tx in the fourth interval from W13 to W14 increases non-linearly in the direction away from the center line Y2, and the inner wall of the explosion-proof groove 101 in the fourth interval is curved, and the inner surface of the bottom wall 10 corresponding to the fourth interval is also curved, and the center of the two curved surfaces is located on the same side of the bottom wall 10.

[0087] exist Figure 13 In the example shown, the critical points of different variation ranges of Tx are labeled. The intersection of the centerline Y2 and the longitudinal section is marked as W20. Then, the critical points of different variation ranges are sequentially labeled as W20, W21, W22, W23, and W24 in the direction away from the centerline Y2. The specific trend of Tx variation from the centerline Y2 in the direction away from the centerline Y2 is as follows:

[0088] 1) Within the first interval from W20 to W21, the value of Tx remains constant at T4 in the direction away from the center line Y2, and the thickness Tx of the bottom wall 10 is minimum at this location. Within this first interval, the inner wall of the explosion-proof groove 101 is flat, and the inner surface of the bottom wall 10 corresponding to this first interval is also flat. Furthermore, the groove width of the explosion-proof groove 101 in the area corresponding to this first interval is X21, and the thickness of the bottom wall 10 at the boss 102 is T1, where 0.25T1≤X21≤0.70T1. For example, X21 can take values ​​such as 0.25T1, 0.30T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, 0.55T1, 0.60T1, 0.65T1, 0.70T1, etc.

[0089] 2) Within the second interval W21 to W22, the value of Tx increases non-linearly away from the center line Y2. Within this second interval, the inner wall of the explosion-proof trough 101 is curved, while the inner surface of the bottom wall 10 corresponding to this second interval is flat. The angle between the inner wall of the trough corresponding to this second interval and the center line Y2 is θ21, where the range of 2θ21 is 45°≤2θ21≤150°. For example, 2θ21 can be 45°, 50°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 120°, 130°, 140°, 150°, etc.

[0090] 3) Within the third interval from W22 to W23, the value of Tx increases non-linearly away from the centerline Y2, meaning the thickness T5 of the bottom wall 10 in the area corresponding to the step surface increases non-linearly. Within this third interval, the inner wall of the explosion-proof groove 101 is curved, while the inner surface of the bottom wall 10 corresponding to this interval is planar. The range of T5 is: 0.60T1≤T5≤1.3T1, and T5 can take values ​​such as 0.60T1, 0.65T1, 0.70T1, 0.75T1, 0.80T1, 0.85T1, 0.90T1, 0.95T1, 1.0T1, 1.1T1, 1.15T1, 1.2T1, 1.25T1, and 1.3T1. In addition, the maximum width of the explosion-proof groove 101 in the corresponding area of ​​this interval is X22, which is twice the distance between W23 and W20. Among them, 1.50T1≤X22≤2.70T1, for example, X22 can take values ​​of 1.55T1, 1.60T1, 1.65T1, 1.70T1, 1.75T1, 1.80T1, 1.85T1, 1.90T1, 1.95T1, 2.0T1, 2.1T1, 2.2T1, 2.2T1, 2.4T1, 2.5T1, 2.6T1, 2.7T1, etc.

[0091] 4) The value of Tx in the interval from W23 to W24 increases non-linearly in the direction away from the center line Y2, and the inner wall of the explosion-proof groove 101 in this interval is curved, and the inner surface of the bottom wall 10 corresponding to this interval is also curved, and the center of the two curved surfaces is located on the same side of the bottom wall 10.

[0092] exist Figure 14 In the example shown, the critical points of different value ranges of Tx are labeled. The intersection of the center line Y2 and the longitudinal section is marked as W30. Then, the critical points of different ranges of change are sequentially marked as W30, W31, W32, W33, and W34 in the direction away from the center line Y2. The specific trend of Tx changing from the center line Y2 in the direction away from the center line Y2 is as follows:

[0093] 1) Within the first interval from W30 to W31, the value of Tx increases non-linearly away from the center line Y2, with the minimum value of Tx being T4 at W30. Within this first interval, the inner wall of the explosion-proof groove 101 is curved, while the inner surface of the bottom wall 10 corresponding to this first interval is flat. Furthermore, the width of the explosion-proof groove 101 within the corresponding region of this first interval is X21, and the thickness of the bottom wall 10 at the boss 102 is T1, where 0.25T1≤X21≤0.70T1. For example, X21 can take values ​​such as 0.25T1, 0.30T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, 0.55T1, 0.60T1, 0.65T1, 0.70T1, etc.

[0094] 2) Within the second interval W31 to W32, the value of Tx increases non-linearly away from the center line Y2. Within this second interval, the inner wall of the explosion-proof groove 101 is curved, while the inner surface of the bottom wall 10 corresponding to this second interval is planar. The angle between the inner wall of the groove corresponding to this second interval and the center line Y2 is θ21, where the range of 2θ21 is 45°≤2θ21≤150°. For example, 2θ21 can be 45°, 50°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 120°, 130°, 140°, 150°, etc.

[0095] 3) Within the third interval from W32 to W33, the value of Tx initially remains constant and then increases non-linearly towards the direction away from the center line Y2. That is, the thickness T5 of the bottom wall 10 in the area corresponding to the step surface initially remains constant and then increases non-linearly. Within this third interval, the inner wall of the explosion-proof groove 101 is initially planar and then curved, and the inner surface of the bottom wall 10 corresponding to this third interval is initially planar and then curved. The range of T5 is: 0.60T1≤T5≤1.3T1, and T5 can take values ​​such as 0.60T1, 0.65T1, 0.70T1, 0.75T1, 0.80T1, 0.85T1, 0.90T1, 0.95T1, 1.0T1, 1.1T1, 1.15T1, 1.2T1, 1.25T1, and 1.3T1. In addition, the maximum width of the explosion-proof groove 101 in the corresponding area of ​​this interval is X22, which is twice the distance between W33 and W30. Among them, 1.50T1≤X22≤2.70T1, for example, X22 can take values ​​of 1.55T1, 1.60T1, 1.65T1, 1.70T1, 1.75T1, 1.80T1, 1.85T1, 1.90T1, 1.95T1, 2.0T1, 2.1T1, 2.2T1, 2.2T1, 2.4T1, 2.5T1, 2.6T1, 2.7T1, etc.

[0096] 4) The value of Tx in the fourth interval from W33 to W34 increases non-linearly in the direction away from the center line Y2, and the inner wall of the explosion-proof groove 101 in the fourth interval is curved, and the inner surface of the bottom wall 10 corresponding to the fourth interval is also curved, and the center of the two curved surfaces is located on the same side of the bottom wall 10.

[0097] exist Figure 15 In the example shown, the critical points of different value ranges of Tx are labeled. The intersection of the center line Y2 and the longitudinal section is marked as W40. Then, the critical points of different ranges of change are sequentially labeled as W40, W41, W42, W43, and W44 in the direction away from the center line Y2. The specific trend of Tx changing from the center line Y2 in the direction away from the center line Y2 is as follows:

[0098] 1) Within the first interval from W40 to W41, the value of Tx remains constant at T4 in the direction away from the center line Y2, and the thickness Tx of the bottom wall 10 is minimum at this location. Within this first interval, the inner wall of the explosion-proof groove 101 is flat, and the inner surface of the bottom wall 10 corresponding to this interval is flat. Furthermore, the width of the explosion-proof groove 101 within the corresponding area of ​​this first interval is X21, and the thickness of the bottom wall 10 at the boss 102 is T1, where 0.25T1≤X21≤0.70T1. For example, X21 can take values ​​such as 0.25T1, 0.30T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, 0.55T1, 0.60T1, 0.65T1, 0.70T1, etc.

[0099] 2) Within the second interval W41 to W42, the value of Tx increases linearly away from the center line Y2. Within this second interval, the inner wall of the explosion-proof groove 101 is an inclined plane, and the inner surface of the bottom wall 10 corresponding to this second interval is a plane. The angle between this inclined plane and the center line Y2 is θ21, where the range of 2θ21 is 45°≤2θ21≤150°. For example, 2θ21 can be 45°, 50°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 120°, 130°, 140°, 150°, etc.

[0100] 3) Within the third interval from W42 to W43, the value of Tx remains constant at T5 in the direction away from the center line Y2, meaning the thickness T5 of the bottom wall 10 in the area corresponding to the step surface remains constant. The inner wall of the explosion-proof groove 101 forms a step surface within this third interval, and the inner surface of the bottom wall 10 corresponding to this third interval is planar. The value range of T5 is: 0.60T1≤T5≤1.3T1, and T5 can take values ​​such as 0.60T1, 0.65T1, 0.70T1, 0.75T1, 0.80T1, 0.85T1, 0.90T1, 0.95T1, 1.0T1, 1.1T1, 1.15T1, 1.2T1, 1.25T1, and 1.3T1. In addition, the maximum width of the explosion-proof groove 101 in the corresponding area of ​​the third interval is X22, which is twice the distance between W43 and W40. Among them, 1.50T1≤X22≤2.70T1, for example, X22 can take values ​​of 1.55T1, 1.60T1, 1.65T1, 1.70T1, 1.75T1, 1.80T1, 1.85T1, 1.90T1, 1.95T1, 2.0T1, 2.1T1, 2.2T1, 2.2T1, 2.4T1, 2.5T1, 2.6T1, 2.7T1, etc.

[0101] 4) The value of Tx in the fourth interval from W43 to W44 increases abruptly in the direction away from the center line Y2, and the inner wall of the explosion-proof groove 101 in the fourth interval is a plane perpendicular to the plane where the bottom wall 10 is located, and the inner surface of the bottom wall 10 corresponding to the fourth interval is also a plane perpendicular to the plane where the bottom wall 10 is located.

[0102] exist Figure 16 In the example shown, the critical points of different numerical variation ranges of Tx are labeled. The intersection of the center line Y2 and the longitudinal section is marked as W50. Then, the critical points of different numerical variation ranges are sequentially labeled as W50, W51, W52, W53, and W54 in the direction away from the center line Y2. The specific trend of Tx variation from the center line Y2 in the direction away from the center line Y2 is as follows:

[0103] 1) Within the first interval from W50 to W51, the value of Tx increases non-linearly away from the center line Y2, with the minimum value of Tx being T4 at W50. Within this first interval, the inner wall of the explosion-proof groove 101 is curved, and the inner surface of the bottom wall 10 corresponding to this first interval is also curved. Furthermore, the groove width X21 of the explosion-proof groove 101 in the region corresponding to this first interval, and the thickness of the bottom wall 10 at the boss 102, is T1, where 0.25T1≤X21≤0.70T1. For example, X21 can take values ​​such as 0.25T1, 0.30T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, 0.55T1, 0.60T1, 0.65T1, 0.70T1, etc.

[0104] 2) Within the second interval W51 to W52, the value of Tx increases non-linearly away from the center line Y2. Within this second interval, the inner wall of the explosion-proof trough 101 is curved, and the inner surface of the bottom wall 10 corresponding to this interval is also curved. The angle between the inner wall of the trough corresponding to this second interval and the center line Y2 is θ21, where the range of 2θ21 is 45°≤2θ21≤150°. For example, 2θ21 can be 45°, 50°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 120°, 130°, 140°, 150°, etc.

[0105] 3) Within the third interval from W52 to W53, the value of Tx increases non-linearly away from the center line Y2, meaning the thickness T5 of the bottom wall 10 in the area corresponding to the step surface increases non-linearly. Within this third interval, the inner wall of the explosion-proof groove 101 is curved, and the inner surface of the bottom wall 10 corresponding to this third interval is also curved. The range of T5 is: 0.60T1≤T5≤1.3T1, and T5 can take values ​​such as 0.60T1, 0.65T1, 0.70T1, 0.75T1, 0.80T1, 0.85T1, 0.90T1, 0.95T1, 1.0T1, 1.1T1, 1.15T1, 1.2T1, 1.25T1, and 1.3T1. In addition, the maximum width of the explosion-proof groove 101 in the corresponding area of ​​the third interval is X22, which is twice the distance between W53 and W50. Among them, 1.50T1≤X22≤2.70T1, for example, X22 can take values ​​of 1.55T1, 1.60T1, 1.65T1, 1.70T1, 1.75T1, 1.80T1, 1.85T1, 1.90T1, 1.95T1, 2.0T1, 2.1T1, 2.2T1, 2.2T1, 2.4T1, 2.5T1, 2.6T1, 2.7T1, etc.

[0106] 4) The value of Tx in the fourth interval from W53 to W54 increases non-linearly in the direction away from the center line Y2, and the inner wall of the explosion-proof groove 101 in the fourth interval is curved, and the inner surface of the bottom wall 10 corresponding to the fourth interval is also curved, and the center of the two curved surfaces is located on the same side of the bottom wall 10.

[0107] also, Figures 12 to 16 In the example shown, the minimum value of Tx is T4, and 0.15T1≤T4≤0.50T1. For example, T4 can take values ​​such as 0.15T1, 0.20T1, 0.25T1, 0.30T1, 0.35T1, 0.35T1, 0.40T1, 0.45T1, 0.50T1, etc.

[0108] Accordingly, in graph S1, the value of Tx has four ranges of variation from its center line Y1 in the direction away from Y1: the first range, the second range, the third range, and the fourth range. The groove width corresponding to the first range is X11, the groove width corresponding to the third range is X12, and the angle between the groove wall and the center line Y1 corresponding to the second range is θ11. Wherein, 0.25T1≤X11≤0.70T1; 1.50T1≤X12≤2.70T1; 45°≤2θ11≤150°. Furthermore, X11 and X21 are the same; X12 and X22 are the same; θ11 and θ21 are the same, and these will not be elaborated further here.

[0109] It is understood that, based on the inventive concept that "the thickness Tx of the bottom wall 10 at the explosion-proof groove 101 has at least one continuously varying numerical range and / or one discontinuously varying numerical range," the variation scheme of the thickness Tx of the bottom wall 10 at the explosion-proof groove 101 is not limited to the above. Figures 12 to 16 The example shown, and the solution based on this inventive concept, undoubtedly falls within the protection scope of this application. Furthermore, it is worth noting that the variation in thickness Tx of the bottom wall 10 at the explosion-proof groove 101 is highly correlated with the longitudinal cross-sectional shape of the explosion-proof groove 101 itself. Therefore, when designing different solutions based on this inventive concept, this can be achieved by setting explosion-proof grooves 101 with different longitudinal cross-sectional shapes. For example, the inner surface of the explosion-proof groove 101 may be composed of regularly connected planes; or the inner surface of the explosion-proof groove 101 may be composed of regularly connected planes and curved surfaces; or the inner surface of the explosion-proof groove 101 may be composed of regularly connected curved surfaces. These will not be further illustrated here.

[0110] It is worth emphasizing again that as long as the longitudinal section shape of the central groove 1 is an axisymmetric figure, the thickness of the bottom wall 10 at the axisymmetric center line of the central groove 1 is the smallest, and the thickness of the bottom wall 10 on one side of the axisymmetric center line of the central groove 1 has a continuously varying numerical range and a discontinuously varying numerical range, it is all within the protection scope of this application; and as long as the longitudinal section shape of the launching groove 2 is an axisymmetric figure, the thickness of the bottom wall 10 at the axisymmetric center line of the launching groove 2 is the smallest, and the thickness of the bottom wall 10 on one side of the axisymmetric center line of the launching groove 2 has a continuously varying numerical range and a discontinuously varying numerical range, it is also within the protection scope of this application.

[0111] like Figure 17 As shown, the central slot 1 extends along a straight line; the emission slot 2 extends along a straight line. The length of the central slot 1 in the region corresponding to the maximum value of Tx is X3, and the length of the emission slot 2 in the region corresponding to the minimum value of Tx is X4; wherein, 0.1X4≤X3≤0.7X4. X3 can take values ​​such as 0.1X4, 0.2X4, 0.3X4, 0.4X4, 0.5X4, 0.6X4, 0.7X4, etc., with 0.50X4 being preferred.

[0112] The number of launching slots 2 ranges from 3 to 8. The launching slots 2 are roughly arranged in a circle around the periphery of the central slot 1, so that the overall shape of the explosion-proof slot 101 can be X-shaped, T-shaped, or star-shaped, etc., without limitation. Preferably, the arrangement of the explosion-proof slots 101 on the bottom wall 10 is an axisymmetric figure, which can ensure that the bottom wall 10 is subjected to uniform force and that the explosion-proof slots 101 can break in an orderly manner when subjected to force, thereby improving the exhaust efficiency.

[0113] See Figures 18 to 19 As shown, Figure 18This describes the deformation of the bottom wall 10 of the explosion-proof housing 100 at the explosion-proof groove 101 when the internal pressure of the explosion-proof housing 100 increases. Figure 19 This diagram shows the deformation of the bottom wall 10 of the explosion-proof housing 100 at the explosion-proof groove 101 when the external pressure of the explosion-proof housing 100 increases. It can be seen that the explosion-proof groove 101 of the explosion-proof housing 100 provided in this application not only enables effective pressure relief of the battery but also increases the effective internal space, improving the battery's design capacity. The flat end face of the bottom wall 10 of the battery simultaneously satisfies the functions of compressing internal pressure during pressure relief and bearing external forces without damaging the explosion-proof groove 101.

[0114] As shown in Table 1, Table 1 shows the correspondence between the parameters of the explosion-proof tank 101 and its performance and manufacturing cost. It can be seen that different values ​​of the parameters of the explosion-proof tank 101 have a certain impact on the pressure relief capacity, external force resistance and manufacturing cost of the explosion-proof tank 101.

[0115] Table 1. Correspondence between explosion-proof groove parameters, their performance, and manufacturing costs.

[0116]

[0117] As shown in Tables 2 and 3, taking lithium-thionyl chloride batteries as an example, the following five technical solutions were designed and experimentally verified using pressure relief capacity, resistance to external forces, manufacturing cost, and internal cavity space as evaluation indicators. Table 2 shows the explosion-proof tank parameters of different embodiments and comparative examples, and Table 3 is a comparison table of results of different embodiments and comparative examples.

[0118] Table 2 Parameters of the explosion-proof grooves in different embodiments and comparative examples

[0119]

[0120] Table 3 Comparison of results between different embodiments and comparative examples

[0121]

[0122] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. An explosion-proof housing for batteries, characterized in that, Includes a bottom wall (10) and side walls (20) connected to and surrounding the periphery of the bottom wall (10). The outer surface of the bottom wall (10) has an explosion-proof groove (101). The thickness of the bottom wall (10) at the explosion-proof groove (101) is Tx, and the value of Tx has at least a continuously varying range and / or a discontinuous range. The explosion-proof groove (101) includes: Central groove (1); The launching slots (2) are arranged around the periphery of the central slot (1) and connected to the central slot (1), and each launching slot (2) extends from the direction of the central slot (1) toward the edge of the bottom wall (10). The outer surface of the bottom wall (10) has a boss (102), and the area of ​​the inner surface of the bottom wall (10) corresponding to the boss (102) is a recess (103). The explosion-proof groove (101) is located within the outer contour range of the boss (102).

2. The explosion-proof housing for batteries according to claim 1, characterized in that, The bottom wall (10) is circular in shape and has an outer diameter of D4; the boss (102) is circular in shape and has an outer diameter of D3, wherein 0.6D4≤D3≤0.85D4.

3. The explosion-proof housing for batteries according to claim 1, characterized in that, The thickness of the bottom wall (10) at the boss (102) is T1, and the thickness of the bottom wall (10) in the area outside the boss (102) is T2, wherein 0.9T1≤T2≤1.2T1.

4. The explosion-proof housing for batteries according to claim 3, characterized in that, The thickness of the sidewall (20) is T3, wherein 0.5T1≤T3≤0.9T1.

5. The explosion-proof housing for batteries according to claim 3, characterized in that, The minimum value of Tx is T4, where 0.15T1≤T4≤0.50T1.

6. The explosion-proof housing for batteries according to claim 3, characterized in that, The thickness variation trend of the bottom wall (10) at the central groove (1) is the same as the thickness variation trend of the bottom wall (10) at the launch groove (2).

7. The explosion-proof housing for batteries according to claim 6, characterized in that, The longitudinal section S1 of the central groove (1) at the centerline Y1 perpendicular to its width direction is an axisymmetric figure; and / or The longitudinal section S2 of the launch slot (2) at the center line Y2 perpendicular to its width direction is an axisymmetric figure.

8. The explosion-proof housing for batteries according to claim 7, characterized in that, In the graph S1, from its center line Y1 in the direction away from the center line Y1, the value of Tx has at least two ranges of variation, wherein the first range corresponds to a groove width of X11, where 0.25T1≤X11≤0.70T1; and / or In the figure S2, from its center line Y2 in the direction away from the center line Y2, the value of Tx has at least two ranges of value variation, where the first range corresponds to the groove width X21, where 0.25T1≤X21≤0.70T1.

9. The explosion-proof housing for batteries according to claim 8, characterized in that, In the figure S1, from its center line Y1 in the direction away from the center line Y1, the value of Tx has at least three ranges of variation, wherein the width of the groove corresponding to the third range is X12, and 1.50T1≤X12≤2.70T1; and / or In the figure S2, from its center line Y2 in the direction away from the center line Y2, the value of Tx has at least three ranges of value variation, where the width of the groove corresponding to the third range is X22, and 1.50T1≤X22≤2.70T1.

10. The explosion-proof housing for batteries according to claim 9, characterized in that, The thickness of the bottom wall (10) in the region corresponding to the third interval is T5, where 0.60T1≤T5≤1.3T1.

11. The explosion-proof housing for batteries according to claim 9, characterized in that, In the figure S1, the angle between the inner wall of the groove corresponding to the second interval and the center line Y1 is θ11, where 45°≤2θ11≤150°; and / or In the figure S2, the angle between the inner wall of the groove corresponding to the second interval and the center line Y2 is θ21, where 45°≤2θ21≤150°.

12. The explosion-proof housing for batteries according to claim 11, characterized in that, X11 is the same as X21; and / or X12 is the same as X22; and / or θ11 is the same as θ21.

13. The explosion-proof housing for batteries according to any one of claims 6-12, characterized in that, The central groove (1) extends in a straight line; the launching groove (2) extends in a straight line.

14. The explosion-proof housing for batteries according to claim 13, characterized in that, The length of the central slot (1) in the region corresponding to the maximum value of Tx is X3, and the length of the emission slot (2) in the region corresponding to the minimum value of Tx is X4; wherein, 0.1X4≤X3≤0.7X4.

15. The explosion-proof housing for batteries according to claim 14, characterized in that, The number of the launch slots (2) ranges from 3 to 8.

16. The explosion-proof housing for batteries according to claim 15, characterized in that, The explosion-proof groove (101) is arranged in an axisymmetric shape on the bottom wall (10).

17. The explosion-proof housing for batteries according to claim 14, characterized in that, The inner surface of the explosion-proof groove (101) is composed of regularly connected planes; or The inner surface of the explosion-proof groove (101) is composed of regularly connected planes and curved surfaces; or The inner surface of the explosion-proof groove (101) is composed of regularly connected curved surfaces.

18. A casing, characterized in that, Includes a cover assembly and an explosion-proof housing for batteries as claimed in any one of claims 1-17, wherein an opening is formed at one end of the sidewall (20) away from the bottom wall (10), and the cover assembly is sealed over the opening.

19. A battery, characterized in that, It includes a battery cell (400) and a housing as described in claim 18, wherein the battery cell (400) is mounted within the housing.

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