Battery case and battery
By designing a cross-shaped explosion-proof groove structure on the battery casing, the problem of low pressure relief efficiency of the battery casing is solved, realizing the formation of rapid pressure relief and efficient pressure relief channels, which is suitable for high energy density batteries.
Patent Information
- Application Number
- CN202610448985.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-07
- Publication Date
- 2026-07-10
AI Technical Summary
The existing explosion-proof groove structure of the battery casing is prone to irregular cracking when the battery is thermally runaway, resulting in low pressure relief efficiency and difficulty in meeting the pressure relief requirements of high energy density batteries.
Design a rectangular battery casing with multiple intersecting explosion-proof groove structures, including a rectangular explosion-proof outer frame and internal explosion-proof grooves, forming multiple pre-set weak points to ensure rapid rupture and pressure relief channels under pressure.
It enables rapid pressure relief of the battery casing, avoids cracking and jamming, improves pressure relief efficiency, and meets the pressure relief requirements of high energy density batteries.
Smart Images
Figure CN122370595A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and more particularly to a battery casing and a battery. Background Technology
[0002] As the energy density requirements for steel-cased batteries in the new energy field continue to increase, the intensity of internal chemical reactions and the risk of thermal runaway also increase accordingly. However, the explosion-proof grooves of battery casings in related technologies mostly adopt a single groove type, which can easily lead to irregular cracks in the casing when the battery experiences thermal runaway. This prevents the internal pressure of the battery casing from being released quickly and effectively, affecting the explosion-proof efficiency. Consequently, the explosion-proof structure of battery casings in related technologies cannot meet the pressure relief efficiency requirements of high-energy-density batteries.
[0003] Therefore, the battery casing in related technologies suffers from low pressure relief efficiency. Summary of the Invention
[0004] This invention provides a battery casing to solve the problem of low pressure relief efficiency in battery casings in related technologies.
[0005] The battery casing of this embodiment is a rectangular casing, and at least one side of the battery casing is provided with an explosion-proof groove structure. The explosion-proof groove structure includes a rectangular explosion-proof outer frame, and the rectangular explosion-proof outer frame includes a first explosion-proof groove, a second explosion-proof groove, a third explosion-proof groove and a fourth explosion-proof groove connected end to end in sequence. The rectangular explosion-proof frame is provided with a fifth explosion-proof groove and a sixth explosion-proof groove. One end of the fifth explosion-proof groove and one end of the sixth explosion-proof groove intersect. The connection point of the fifth explosion-proof groove and the sixth explosion-proof groove is located on one of the first explosion-proof groove, the second explosion-proof groove, the third explosion-proof groove and the fourth explosion-proof groove. The other three of the first explosion-proof groove, the second explosion-proof groove, the third explosion-proof groove and the fourth explosion-proof groove have two connection endpoints. The other end of the fifth explosion-proof groove is located at one of the connection endpoints, and the other end of the sixth explosion-proof groove is located at the other connection endpoint.
[0006] The battery casing of this invention features a rectangular explosion-proof outer frame (a first explosion-proof groove, a second explosion-proof groove, a third explosion-proof groove, and a fourth explosion-proof groove). Inside the outer frame, a fifth explosion-proof groove and a sixth explosion-proof groove are also provided. One end of the fifth and sixth explosion-proof grooves intersects with one of the explosion-proof grooves in the outer frame, and the other end connects to the connection points of the other three members of the outer frame. The first to sixth explosion-proof grooves intersect to form multiple pre-set weak points, allowing the battery casing to quickly rupture under pressure, forming a pressure relief channel. Simultaneously, the casing can tear along the direction of the explosion-proof grooves, preventing jamming during rupture. This allows the pressure relief channel to expand rapidly, ensuring that the pressure inside the battery casing can be quickly discharged along the pressure relief channel, thereby greatly improving the pressure relief efficiency of this invention.
[0007] Therefore, the battery casing of the present invention has the characteristic of high pressure relief efficiency.
[0008] In some embodiments, the explosion-proof groove structure is provided on one or two end faces of the battery housing along its length, wherein the first explosion-proof groove and the third explosion-proof groove are both parallel to the height direction of the battery housing; and the second explosion-proof groove and the fourth explosion-proof groove are both parallel to the width direction of the battery housing. The length L1 of the rectangular explosion-proof outer frame and the width W of the battery housing satisfy: 40%W≤L1≤80%W; the width W1 of the rectangular explosion-proof outer frame and the height H of the battery housing satisfy: 40%H≤W1≤80%H.
[0009] In some embodiments, the explosion-proof groove structure is provided on one or two end faces of the battery housing in the width direction; The first and third explosion-proof grooves are both parallel to the height direction of the battery casing; the second and fourth explosion-proof grooves are both parallel to the length direction of the battery casing. The length L1 of the rectangular explosion-proof outer frame and the length L of the battery housing satisfy: 40%L≤L1≤80%L; the width W1 of the rectangular explosion-proof outer frame and the height H of the battery housing satisfy: 40%H≤W1≤80%H.
[0010] In some embodiments, the explosion-proof groove structure is provided on one or two end faces of the battery housing in the height direction; the first explosion-proof groove and the third explosion-proof groove are both parallel to the width direction of the battery housing; the second explosion-proof groove and the fourth explosion-proof groove are both parallel to the length direction of the battery housing; The length L1 of the rectangular explosion-proof outer frame and the length L of the battery casing satisfy: 40%L≤L1≤80%L; the width W1 of the rectangular explosion-proof outer frame and the width W of the battery casing satisfy: 40%W≤W1≤80%W; In some embodiments, the connection point between the fifth explosion-proof groove and the sixth explosion-proof groove is located at the midpoint of one of the first explosion-proof groove, the second explosion-proof groove, the third explosion-proof groove, and the fourth explosion-proof groove.
[0011] In some embodiments, the end face of the battery housing with the explosion-proof groove structure is the explosion-proof surface, and the intersection of the diagonals of the rectangular explosion-proof outer frame coincides with the intersection of the diagonals of the explosion-proof surface.
[0012] In some embodiments, the depths of the first explosion-proof groove, the second explosion-proof groove, the third explosion-proof groove, the fourth explosion-proof groove, the fifth explosion-proof groove, and the sixth explosion-proof groove are all 30%-50% of the wall thickness of the battery casing.
[0013] In some embodiments, the depth of the fifth explosion-proof groove and the depth of the sixth explosion-proof groove are both greater than the depths of the first explosion-proof groove, the second explosion-proof groove, the third explosion-proof groove, and the fourth explosion-proof groove.
[0014] In some embodiments, the depths of the first explosion-proof groove, the second explosion-proof groove, the third explosion-proof groove, and the fourth explosion-proof groove are the same.
[0015] The present invention also provides a battery.
[0016] The battery of this invention includes the battery casing described in the above embodiments. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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 effort.
[0018] Figure 1 This is a schematic diagram of the battery casing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure where the explosion-proof zone is located on the end face along the length of the battery casing; Figure 3 This is a schematic diagram of the structure where the explosion-proof zone is located on the end face in the width direction of the battery casing; Figure 4 This is a schematic diagram of the structure of the explosion-proof zone located on the end face of the battery casing in the height direction.
[0019] In the picture: 100. Battery casing; 1. Explosion-proof groove structure; 2. Rectangular explosion-proof outer frame; 201. First explosion-proof groove; 202. Second explosion-proof groove; 203. Third explosion-proof groove; 204. Fourth explosion-proof groove; 3. Fifth explosion-proof groove; 4. Fourth explosion-proof groove. Detailed Implementation
[0020] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0021] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0023] In order to solve the problem of low pressure relief efficiency in the battery casing 100 in the related technology, the present invention provides a battery casing 100.
[0024] The battery housing 100 of this embodiment is a rectangular housing, and at least one side of the battery housing 100 is provided with an explosion-proof groove structure 1. The explosion-proof groove structure 1 includes a rectangular explosion-proof outer frame 2, and the rectangular explosion-proof outer frame 2 includes a first explosion-proof groove 201, a second explosion-proof groove 202, a third explosion-proof groove 203 and a fourth explosion-proof groove 204 connected end to end in sequence. The rectangular explosion-proof outer frame 2 is provided with a fifth explosion-proof groove 3 and a sixth explosion-proof groove 4. One end of the fifth explosion-proof groove 3 and one end of the sixth explosion-proof groove 4 intersect, and the connection between the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 is located on one of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203 and the fourth explosion-proof groove 204. The other three of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203 and the fourth explosion-proof groove 204 have two connection endpoints. The other end of the fifth explosion-proof slot 3 is located at one of the connection endpoints, and the other end of the sixth explosion-proof slot 4 is located at the other connection endpoint.
[0025] The battery casing 100 of this embodiment of the invention is provided with a rectangular explosion-proof outer frame (first explosion-proof groove 201, second explosion-proof groove 202, third explosion-proof groove 203 and fourth explosion-proof groove 204), and a fifth explosion-proof groove 3 and a sixth explosion-proof groove 4 are provided inside the explosion-proof outer frame. One end of the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 intersects on an explosion-proof groove in the outer frame, and the other end of the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 are respectively connected to the connection points of the other three parts of the outer frame. The first to sixth explosion-proof grooves 4 intersect each other to form multiple preset weak points, so that the battery casing 100 can quickly start to break under pressure to form a pressure relief channel. At the same time, it can tear along the direction of the explosion-proof groove to avoid jamming during the breakage, so that the pressure relief channel can be rapidly enlarged, ensuring that the pressure inside the battery casing 100 can be quickly discharged along the pressure relief channel, thereby greatly improving the pressure relief efficiency of this embodiment of the invention.
[0026] Therefore, the battery casing 100 of this embodiment has the characteristic of high pressure relief efficiency.
[0027] In some embodiments, an explosion-proof groove structure 1 is provided on one or two end faces of the battery housing 100 along its length. That is, an explosion-proof groove structure 1 can be provided on one end face of the battery housing 100 along its length, or an explosion-proof groove structure 1 can be provided on both end faces of the battery housing 100 along its length.
[0028] The first explosion-proof groove 201 and the third explosion-proof groove 203 are both parallel to the height direction of the battery housing 100; the second explosion-proof groove 202 and the fourth explosion-proof groove 204 are both parallel to the width direction of the battery housing 100, so that the length and width of the rectangular explosion-proof outer frame 2 correspond to the width and height of the battery housing 100 respectively, which can better fit the battery housing 100.
[0029] The length L1 of the rectangular explosion-proof outer frame 2 and the width W of the battery housing 100 satisfy: 40%W≤L1≤80%W; the width W1 of the rectangular explosion-proof outer frame 2 and the height H of the battery housing 100 satisfy: 40%H≤W1≤80%H.
[0030] It is understandable that by satisfying the above conditions for the length L1 of the rectangular explosion-proof frame 2 and the width W of the battery housing 100, and the width W1 of the rectangular explosion-proof frame 2 and the height H of the battery housing 100, the size of the rectangular explosion-proof frame 2 can be limited within a reasonable range, avoiding problems of being too large or too small, so as to ensure the explosion-proof effect of the rectangular explosion-proof frame 2, and thus ensure the explosion-proof effect of the explosion-proof groove structure 1.
[0031] In some embodiments, an explosion-proof groove structure 1 is provided on one or two end faces of the battery housing 100 in the width direction; that is, an explosion-proof groove structure 1 can be provided on one end face of the battery housing 100 in the width direction, or an explosion-proof groove structure 1 can be provided on both end faces of the battery housing 100 in the width direction.
[0032] The first explosion-proof groove 201 and the third explosion-proof groove 203 are both parallel to the height direction of the battery housing 100; the second explosion-proof groove 202 and the fourth explosion-proof groove 204 are both parallel to the length direction of the battery housing 100, so that the length and width of the rectangular explosion-proof outer frame 2 correspond to the length and height of the battery housing 100 respectively, which can better fit the battery housing 100.
[0033] The length L1 of the rectangular explosion-proof outer frame 2 and the length L of the battery housing 100 satisfy: 40%L≤L1≤80%L; the width W1 of the rectangular explosion-proof outer frame 2 and the height H of the battery housing 100 satisfy: 40%H≤W1≤80%H.
[0034] By satisfying the above conditions, the length L1 of the rectangular explosion-proof frame 2, the length L of the battery housing 100, the width W1 of the rectangular explosion-proof frame 2, and the height H of the battery housing 100 can be limited to a reasonable range, avoiding problems of being too large or too small, so as to ensure the explosion-proof effect of the rectangular explosion-proof frame 2, and thus ensure the explosion-proof effect of the explosion-proof groove structure 1.
[0035] In some embodiments, an explosion-proof groove structure 1 is provided on one or both end faces of the battery housing 100 in the height direction; that is, an explosion-proof groove structure 1 can be provided on one end face of the battery housing 100 in the height direction, or an explosion-proof groove structure 1 can be provided on both end faces of the battery housing 100 in the height direction.
[0036] The first explosion-proof groove 201 and the third explosion-proof groove 203 are both parallel to the width direction of the battery housing 100; the second explosion-proof groove 202 and the fourth explosion-proof groove 204 are both parallel to the length direction of the battery housing 100; so that the length and width of the rectangular explosion-proof outer frame 2 correspond to the length and width of the battery housing 100 respectively, and can better fit the battery housing 100.
[0037] The length L1 of the rectangular explosion-proof outer frame 2 and the length L of the battery housing 100 satisfy: 40%L≤L1≤80%L; the width W1 of the rectangular explosion-proof outer frame 2 and the width W of the battery housing 100 satisfy: 40%W≤W1≤80%W; By satisfying the above conditions, the length L1 of the rectangular explosion-proof outer frame 2 and the length L of the battery housing 100, as well as the width W1 of the rectangular explosion-proof outer frame 2 and the width of the battery housing 100, can limit the size of the rectangular explosion-proof outer frame 2 within a reasonable range, avoiding problems of being too large or too small, so as to ensure the explosion-proof effect of the rectangular explosion-proof outer frame 2, and thus ensure the explosion-proof effect of the explosion-proof groove structure 1.
[0038] In some embodiments, the connection point between the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 is located at the midpoint of one of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203, and the fourth explosion-proof groove 204.
[0039] Understandably, placing the connection point of the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 at the midpoint of one of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203, and the fourth explosion-proof groove 204 further optimizes the balance of the explosion-proof groove distribution and the accuracy of stress guidance: it makes the connection positions of the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 with the rectangular explosion-proof outer frame 2 more symmetrical, ensuring the synchronization of multi-path pressure relief; it also makes the intersection points of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203, the fourth explosion-proof groove 204, the fifth explosion-proof groove 3, and the sixth explosion-proof groove 4 more regular, which can more accurately guide the shell to crack regularly along the preset trajectory; Meanwhile, the midpoint connection design allows the rupture to spread synchronously from the midpoint of the outer frame to both ends and the internal cross grooves, rapidly expanding the effective pressure relief range and improving the uniformity and thoroughness of pressure release, which can further adapt to the high-voltage rapid pressure relief requirements of high-energy-density batteries.
[0040] In some embodiments, the end face of the battery housing 100 with the explosion-proof groove structure 1 is the explosion-proof surface, and the intersection of the diagonals of the rectangular explosion-proof outer frame 2 coincides with the intersection of the diagonals of the explosion-proof surface.
[0041] It is understandable that by aligning the intersection of the diagonals of the rectangular explosion-proof outer frame 2 with the intersection of the diagonals of the explosion-proof surface, the centrally symmetrical groove layout allows the explosion-proof grooves to be evenly distributed on the explosion-proof surface, avoiding weak areas caused by excessive local grooving. This allows the force on the shell to be evenly transmitted along a symmetrical path, reducing stress concentration and damage to the structural strength. This ensures both pressure relief efficiency and structural strength of the battery shell 100.
[0042] In some embodiments, the depths of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203, the fourth explosion-proof groove 204, the fifth explosion-proof groove 3, and the sixth explosion-proof groove 4 are all 30%-50% of the wall thickness of the battery casing 100.
[0043] Preferably, the depth of the first explosion-proof groove 201 is 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50% of the wall thickness of the battery casing 100.
[0044] The depth of the second explosion-proof groove 202 is 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, and 50% of the wall thickness of the battery casing 100.
[0045] The depth of the third explosion-proof groove 203 is 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, and 50% of the wall thickness of the battery casing 100.
[0046] The depth of the fourth explosion-proof groove 204 is 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, and 50% of the wall thickness of the battery casing 100.
[0047] The depth of the fifth explosion-proof groove 3 accounts for 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, and 50% of the wall thickness of the battery casing 100.
[0048] The depth of the fifth explosion-proof groove 3 accounts for 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, and 50% of the wall thickness of the battery casing 100.
[0049] It is understandable that the greater the depth of the first explosion-proof groove 201 relative to the wall thickness of the battery housing 100, the greater the depth of the first explosion-proof groove 201, and the thinner the wall thickness of the portion of the battery housing 100 corresponding to the first explosion-proof groove 201. Although a greater depth of the first explosion-proof groove 201 is more conducive to forming a pressure relief channel, it will reduce the structural strength of the battery housing 100. Therefore, by setting the depth of the first explosion-proof groove 201 relative to the battery housing 100 within the above-mentioned range, the pressure relief requirements of the battery housing 100 can be met while satisfying the structural strength of the battery housing 100.
[0050] Similarly, by setting the depths of the second explosion-proof groove 202, the third explosion-proof groove 203, and the fourth explosion-proof groove 204 within the ranges described above for the battery housing 100, the pressure relief requirements of the battery housing 100 can be met while satisfying the structural strength of the battery housing 100.
[0051] In some embodiments, the depth of the fifth explosion-proof groove 3 and the depth of the sixth explosion-proof groove 4 are both greater than the depths of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203 and the fourth explosion-proof groove 204.
[0052] In some embodiments, the depths of the first explosion-proof groove 201, the second explosion-proof groove 202, the third explosion-proof groove 203, and the fourth explosion-proof groove 204 are the same.
[0053] It is understandable that the explosion-proof grooves 201, 202, 203, and 204 are guiding explosion-proof grooves. Their function is to guide the cracks to expand along a predetermined path after the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 crack, forming a regular pressure relief port.
[0054] For example, the V-shaped groove formed by the fifth explosion-proof groove 3 and the sixth explosion-proof groove 4 will cause stress to concentrate at the tip of the V-shaped groove when the cell experiences thermal runaway and the internal pressure increases. This will cause the V-shaped groove to tear from the tip, and the crack will rapidly extend along the V-shaped groove. At the same time, it will be guided by the explosion-proof groove to extend outward. Finally, the explosion-proof area will be divided into three petal-shaped structures that flip up to form a large and regular pressure relief port, thereby achieving rapid and safe pressure relief.
[0055] The present invention also provides a battery.
[0056] The battery of this invention includes the battery casing 100 described in the above embodiments.
[0057] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.
Claims
1. A battery casing, characterized in that, The battery housing (100) is a rectangular housing, and at least one side of the battery housing (100) is provided with an explosion-proof groove structure (1). The explosion-proof groove structure (1) includes a rectangular explosion-proof outer frame (2). The rectangular explosion-proof outer frame (2) includes a first explosion-proof groove (201), a second explosion-proof groove (202), a third explosion-proof groove (203), and a fourth explosion-proof groove (204) connected end to end in sequence. The rectangular explosion-proof frame (2) is provided with a fifth explosion-proof groove (3) and a sixth explosion-proof groove (4). One end of the fifth explosion-proof groove (3) and one end of the sixth explosion-proof groove (4) intersect. The connection between the fifth explosion-proof groove (3) and the sixth explosion-proof groove (4) is located on one of the first explosion-proof groove (201), the second explosion-proof groove (202), the third explosion-proof groove (203), and the fourth explosion-proof groove (204). The other three of the first explosion-proof groove (201), the second explosion-proof groove (202), the third explosion-proof groove (203), and the fourth explosion-proof groove (204) have two connection endpoints. The other end of the fifth explosion-proof groove (3) is located at one of the connection endpoints, and the other end of the sixth explosion-proof groove (4) is located at the other connection endpoint.
2. The battery casing according to claim 1, characterized in that, The explosion-proof groove structure (1) is provided on one or two end faces along the length of the battery housing (100). The first explosion-proof groove (201) and the third explosion-proof groove (203) are both parallel to the height direction of the battery housing (100); the second explosion-proof groove (202) and the fourth explosion-proof groove (204) are both parallel to the width direction of the battery housing (100). The length L1 of the rectangular explosion-proof outer frame (2) and the width W of the battery housing (100) satisfy: 40%W≤L1≤80%W; the width W1 of the rectangular explosion-proof outer frame (2) and the height H of the battery housing (100) satisfy: 40%H≤W1≤80%H.
3. The battery casing according to claim 1, characterized in that, The explosion-proof groove structure (1) is provided on one or two end faces of the battery housing (100) in the width direction. The first explosion-proof groove (201) and the third explosion-proof groove (203) are both parallel to the height direction of the battery housing (100); the second explosion-proof groove (202) and the fourth explosion-proof groove (204) are both parallel to the length direction of the battery housing (100); The length L1 of the rectangular explosion-proof outer frame (2) and the length L of the battery housing (100) satisfy: 40%L≤L1≤80%L; the width W1 of the rectangular explosion-proof outer frame (2) and the height H of the battery housing (100) satisfy: 40%H≤W1≤80%H.
4. The battery casing according to claim 1, characterized in that, The explosion-proof groove structure (1) is provided on one or two end faces of the battery housing (100) in the height direction; the first explosion-proof groove (201) and the third explosion-proof groove (203) are both parallel to the width direction of the battery housing (100); the second explosion-proof groove (202) and the fourth explosion-proof groove (204) are both parallel to the length direction of the battery housing (100); The length L1 of the rectangular explosion-proof outer frame (2) and the length L of the battery housing (100) satisfy: 40%L≤L1≤80%L; the width W1 of the rectangular explosion-proof outer frame (2) and the width W of the battery housing (100) satisfy: 40%W≤W1≤80%W.
5. The battery casing according to claim 1, characterized in that, The connection point between the fifth explosion-proof groove (3) and the sixth explosion-proof groove (4) is located at the midpoint of one of the first explosion-proof groove (201), the second explosion-proof groove (202), the third explosion-proof groove (203), and the fourth explosion-proof groove (204).
6. The battery casing according to claim 1, characterized in that, The end face of the battery housing (100) with the explosion-proof groove structure (1) is an explosion-proof surface, and the intersection of the diagonals of the rectangular explosion-proof frame (2) coincides with the intersection of the diagonals of the explosion-proof surface.
7. The battery casing according to claim 1, characterized in that, The depths of the first explosion-proof groove (201), the second explosion-proof groove (202), the third explosion-proof groove (203), the fourth explosion-proof groove (204), the fifth explosion-proof groove (3), and the sixth explosion-proof groove (4) are all 30%-50% of the wall thickness of the battery casing (100).
8. The battery casing according to claim 7, characterized in that, The depth of the fifth explosion-proof groove (3) and the depth of the sixth explosion-proof groove (4) are both greater than the depths of the first explosion-proof groove (201), the second explosion-proof groove (202), the third explosion-proof groove (203) and the fourth explosion-proof groove (204).
9. The battery casing according to claim 7, characterized in that, The depths of the first explosion-proof groove (201), the second explosion-proof groove (202), the third explosion-proof groove (203), and the fourth explosion-proof groove (204) are the same.
10. A battery, characterized in that, Includes the battery casing (100) as described in any one of claims 1-9.