Battery housing assembly and battery

Abstract

The utility model relates to battery technical field discloses battery shell subassembly and battery, include: shell, open having pressure release mouth, the shell surrounds first surface formed with pressure release mouth, the first side of explosion -proof sheet is pasted with first surface arrangement, the weak area is formed on explosion -proof sheet, buffer piece, set up between shell and explosion -proof sheet, and at least partial embedding is in explosion -proof sheet, buffer piece sets up in weak area near the edge of one side of explosion -proof sheet. The utility model in the transmission process of shell's vibration to the weak area of explosion -proof sheet, utilizes buffer piece and can play the role of buffer shock absorption, reduces the influence of shell vibration to explosion -proof sheet, thereby avoids the cracking of explosion -proof sheet in weak area, further avoids explosion -proof sheet abnormal opening valve, guarantees the pressure relief effect of explosion -proof sheet, avoids the increase of battery use cost due to the accidental damage of explosion -proof sheet.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery casing components and batteries. Background Technology

[0002] With the development of power batteries, batteries are moving towards higher energy density. However, this increased energy density leads to greater heat generation during battery use, causing excessively high temperatures within individual cells. This can affect the lifespan of individual cells and, in severe cases, trigger thermal runaway, reducing battery safety. Furthermore, thermal runaway in one cell can spread to other cells. Therefore, battery casings (housing or cover) typically have pressure relief ports with explosion-proof discs installed at these ports. These discs have weak points; when thermal runaway occurs, the large amount of high-temperature gas generated inside bursts through these weak points and releases pressure through the pressure relief ports. However, when the battery vibrates due to impacts or other factors, the vibration of the battery casing can cause the explosion-proof disc to vibrate. This vibration, transmitted to the weak points of the disc, can easily cause cracking, leading to abnormal opening of the disc, affecting its pressure relief function, and increasing battery operating costs. Utility Model Content

[0003] In view of this, the present invention provides a battery casing assembly and a battery to solve the problem in the prior art where vibration of the explosion-proof sheet causes cracking in the weak area, resulting in abnormal valve opening of the explosion-proof sheet, affecting the pressure relief effect of the explosion-proof sheet, and increasing the cost of battery use.

[0004] In a first aspect, the present invention provides a battery casing assembly, comprising: a casing having a pressure relief port, the casing having a first surface formed around the pressure relief port; an explosion-proof sheet connected to the casing and covering the pressure relief port, a first side of the explosion-proof sheet being fitted to the first surface, and a weak area being formed on the explosion-proof sheet; and a buffer member disposed between the casing and the explosion-proof sheet, and at least partially embedded in the explosion-proof sheet, the buffer member being disposed on the side of the weak area near the edge of the explosion-proof sheet.

[0005] Beneficial effects: By placing a buffer between the outer casing and the explosion-proof sheet, and positioning the buffer on the side of the weak area near the edge of the explosion-proof sheet, with at least a portion of the buffer embedded within the explosion-proof sheet, the buffer can buffer and dampen vibrations as they are transmitted from the outer casing to the weak area of ​​the explosion-proof sheet. This reduces the impact of the outer casing vibration on the explosion-proof sheet, preventing cracking of the explosion-proof sheet in the weak area. Consequently, it prevents abnormal opening of the explosion-proof sheet, ensuring its pressure relief function and avoiding increased battery usage costs due to accidental damage to the explosion-proof sheet.

[0006] Secondly, the present invention also provides a battery, comprising: the aforementioned battery casing assembly; and a battery cell disposed within the battery casing assembly. Attached Figure Description

[0007] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the overall structure of a battery according to an embodiment of the present utility model;

[0009] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0010] Figure 3 for Figure 1 A top view of the battery shown;

[0011] Figure 4 for Figure 3 Cross-sectional view along the BB direction;

[0012] Figure 5 for Figure 4 A magnified view of part C in the diagram.

[0013] Explanation of reference numerals in the attached figures:

[0014] 1. Outer shell; 11. Pressure relief port; 12. First surface; 2. Explosion-proof sheet; 21. First side; 22. Weak area; 23. Groove; 24. Stepped structure; 25. Opening part; 3. Buffer; 4. Welding line; 5. Shell; 6. Cover plate. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0017] According to an embodiment of the present invention, a battery casing assembly is provided, comprising: a casing 1 having a pressure relief port 11, the casing 1 having a first surface 12 formed around the pressure relief port 11; an explosion-proof sheet 2 connected to the casing 1 and covering the pressure relief port 11, the first side 21 of the explosion-proof sheet 2 being fitted to the first surface 12, and a weak area 22 being formed on the explosion-proof sheet 2; and a buffer member 3 disposed between the casing 1 and the explosion-proof sheet 2, and at least partially embedded in the explosion-proof sheet 2, the buffer member 3 being disposed on the side of the weak area 22 near the edge of the explosion-proof sheet 2.

[0018] The battery casing assembly of this embodiment uses a buffer 3 between the casing 1 and the explosion-proof sheet 2. The buffer 3 is positioned on the side of the weak area 22 near the edge of the explosion-proof sheet 2, and at least part of the buffer 3 is embedded in the explosion-proof sheet 2. Therefore, during the transmission of vibration from the casing 1 to the weak area 22 of the explosion-proof sheet 2, the buffer 3 can buffer and dampen the vibration, reducing the impact of the casing 1's vibration on the explosion-proof sheet 2. This prevents the explosion-proof sheet 2 from cracking in the weak area 22, thereby preventing abnormal opening of the explosion-proof sheet 2, ensuring the pressure relief function of the explosion-proof sheet 2, and avoiding an increase in battery usage costs due to accidental damage to the explosion-proof sheet 2.

[0019] It is worth noting that the buffer 3 is placed on the side of the weak area 22 near the edge of the explosion-proof sheet 2, that is, the buffer 3 is placed on the outer periphery of the explosion-proof sheet 2. Therefore, the vibration of the outer shell 1 will first pass through the buffer 3, and after being buffered and damped by the buffer 3, it will reach the weak area 22, thereby reducing the vibration transmitted to the weak area 22.

[0020] It should be noted that you should refer to [link / reference]. Figure 2 and Figure 5 By punching or laser etching on the substrate of the explosion-proof sheet 2, the thickness of a portion of the substrate is reduced, thereby forming an explosion-proof sheet 2 with a weak area 22. Furthermore, the area enclosed by the weak area 22 is the opening portion 25 of the explosion-proof sheet 2. When the battery experiences thermal runaway, the high-temperature, high-pressure gas inside the battery destroys the weak area 22, causing the opening portion 25 to open, thus allowing the battery interior to connect with the outside through the pressure relief port 11, enabling the release of gas from the battery interior.

[0021] It needs further clarification that the aforementioned abnormal opening of the explosion-proof disc 2 is in contrast to its normal opening. Normal opening of the explosion-proof disc 2 refers to a situation where, due to thermal runaway or other issues, excessive gas is generated inside the battery, leading to excessive internal pressure. This excessive pressure acts on the explosion-proof disc 2, causing it to burst open at its weak point 22, thus releasing internal pressure and preventing battery explosion. Abnormal opening of the explosion-proof disc 2, however, occurs when the internal battery pressure remains within the normal range and does not cause the weak point 22 of the explosion-proof disc 2 to burst open under external forces, such as compression or impact.

[0022] In one embodiment, such as Figure 4 As shown, the battery casing assembly includes a housing 5 and a cover plate 6. The housing 5 has at least one opening, and the cover plate 6 is connected to the housing 5 and seals the opening. The housing 5 and the cover plate 6 enclose a receiving space. The outer casing 1 is either the housing 5 or the cover plate 6. That is, the explosion-proof plate 2 can be disposed on the housing 5 or on the cover plate 6. When the explosion-proof plate 2 is disposed on the housing 5, the explosion-proof plate 2 can be disposed on the side of the housing 5 away from the receiving space (i.e., the outer surface of the housing 5, in which case the outer surface of the housing 5 forms the first surface 12, and the first side 21 of the explosion-proof plate 2 is the side of the explosion-proof plate 2 facing the receiving space). Of course, the explosion-proof plate 2 can also be disposed on the side of the housing 5 facing the receiving space (i.e., the inner surface of the housing 5, in which case the inner surface of the housing 5 forms the first surface 12, and the first side 21 of the explosion-proof plate 2 is the side of the explosion-proof plate 2 facing the receiving space). The explosion-proof disc 2 is located on the side of the cover plate 6 away from the receiving space. When the explosion-proof disc 2 is installed on the cover plate 6, the explosion-proof disc 2 can be installed on the side of the cover plate 6 away from the receiving space (that is, the outer surface of the cover plate 6, in which case the outer surface of the cover plate 6 forms the first surface 12, and the first side 21 of the explosion-proof disc 2 is the side of the explosion-proof disc 2 facing the receiving space). Of course, the explosion-proof disc 2 can also be installed on the side of the cover plate 6 facing the receiving space (that is, the inner surface of the cover plate 6, in which case the inner surface of the cover plate 6 forms the first surface 12, and the first side 21 of the explosion-proof disc 2 is the side of the explosion-proof disc 2 away from the receiving space).

[0023] Specifically, in this embodiment, such as Figure 3 As shown, the explosion-proof sheet 2 is disposed on the cover plate 6 and is fitted to the outer surface of the cover plate 6.

[0024] In one embodiment, such as Figure 5 As shown, the explosion-proof sheet 2 has a groove 23 on its first side 21, and the buffer 3 is disposed between the first surface 12 and the first side 21, with the buffer 3 at least partially embedded in the groove 23. This arrangement allows the buffer 3 to better separate the outer shell 1 and the explosion-proof sheet 2, thereby achieving a better buffering and vibration reduction effect.

[0025] Specifically, in this embodiment, such as Figure 5 As shown, the buffer 3 is disposed between the outer surface of the cover plate 6 and the inner surface of the explosion-proof sheet 2, which also makes it easier to set the groove 23 and assemble the buffer 3.

[0026] In one embodiment, such as Figure 5 As shown, in the direction perpendicular to the first surface 12, the depth of the buffer 3 embedded in the groove 23 is h, satisfying 0.1mm≤h≤1mm. This setting satisfies the buffering effect of the buffer 3 while avoiding affecting the structural strength of the explosion-proof sheet 2.

[0027] It is worth noting that if h > 1 mm, the depth of the buffer 3 embedded in the groove 23 is too large, thus requiring an excessively deep groove 23 itself. Consequently, the remaining thickness of the explosion-proof sheet 2 after the groove 23 is opened is too small, resulting in low structural strength of the explosion-proof sheet 2. During assembly and battery use, the explosion-proof sheet 2 is prone to deformation or even breakage when subjected to vibration, which not only affects the pressure relief function of the explosion-proof sheet 2 but also increases production and usage costs. If h < 0.1 mm, the portion of the buffer 3 embedded in the groove 23 is too small, resulting in a low buffering effect of the buffer 3 against vibration. This means that a significant amount of vibration will still be transmitted to the weak area 22, making it highly likely that the explosion-proof sheet 2 will crack in the weak area 22. This could still lead to abnormal valve opening of the explosion-proof sheet 2, and the pressure relief function of the explosion-proof sheet 2 and the cost of battery use cannot be guaranteed.

[0028] Optionally, the value of h can be any value from 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, or a value between any two values.

[0029] It is worth noting that in this embodiment, the direction perpendicular to the first surface 12 is the thickness direction of the cover plate 6.

[0030] In one embodiment, the buffer 3 is continuously arranged circumferentially around the explosion-proof sheet 2. That is, the buffer 3 is arranged around the outer periphery of the weak area 22, thereby providing all-round buffering and vibration reduction for the weak area 22, achieving effective protection for the weak area 22, further reducing the impact of the vibration of the outer shell 1 on the explosion-proof sheet 2, thereby further reducing the possibility of abnormal valve opening of the explosion-proof sheet 2, further ensuring the pressure relief function of the explosion-proof sheet 2, and further avoiding the increase in battery usage costs due to accidental damage to the explosion-proof sheet 2.

[0031] It is worth noting that the weak area 22 can be continuously arranged along the circumference of the explosion-proof sheet 2 (i.e., arranged around the entire circumference) or discontinuously arranged (for example, arranged in several segments at intervals along the circumference of the explosion-proof sheet 2). Preferably, regardless of whether the weak area 22 is continuously or discontinuously arranged, the buffer 3 is arranged around the outer periphery of the weak area 22 in a complete circumference; of course, when the weak area 22 is discontinuously arranged, the buffer 3 can also be discontinuously arranged, so that the buffer 3 is arranged corresponding to the weak area 22.

[0032] In one embodiment, such as Figure 5 As shown, several buffer elements 3 are spaced apart between the weak area 22 and the edge of the explosion-proof sheet 2. By setting several buffer elements 3, the buffering and vibration reduction effect can be further improved, and the buffering effect can be made more uniform. Therefore, the impact of the vibration of the outer shell 1 on the explosion-proof sheet 2 can be further reduced, thereby further reducing the possibility of abnormal valve opening of the explosion-proof sheet 2, further ensuring the pressure relief function of the explosion-proof sheet 2, and further avoiding the increase in battery usage costs due to accidental damage to the explosion-proof sheet 2.

[0033] It is worth noting that by setting several buffer components 3 to achieve the function of buffering and vibration reduction, the vibration experienced by each buffer component 3 is reduced, making the buffering effect of each buffer component 3 more uniform, extending the service life of each buffer component 3, and thus ensuring the service life of the explosion-proof sheet 2.

[0034] In one embodiment, such as Figure 5 As shown, the edge of the explosion-proof sheet 2 is welded to the outer shell 1 to form a weld line 4. On a cross-section perpendicular to the first surface 12, the minimum distance between the weak area 22 and the weld line 4 is 'a', satisfying 1mm ≤ a ≤ 8mm. This arrangement positions the buffer 3 between the weld line 4 and the weak area 22, ensuring the buffering and vibration reduction effect while avoiding impacting the opening area of ​​the explosion-proof sheet 2, thereby ensuring the battery's pressure relief effect.

[0035] It should be noted that, since the welding line 4 is located at the edge of the explosion-proof sheet 2, the distance between the weak area 22 and the welding line 4 is the same as the distance between the edge of the weak area 22 and the edge of the explosion-proof sheet 2.

[0036] It is worth noting that a certain degree of vibration will also occur during the welding process between the edge of the explosion-proof sheet 2 and the outer shell 1. The buffer 3 can not only buffer and reduce the vibration caused by factors such as collisions to the battery, but also buffer and reduce the vibration during the welding process, thus preventing the cracking of the weak area 22 caused by the vibration during the welding process.

[0037] It should be noted that if a > 8mm, the weak area 22 is too far from the edge of the explosion-proof sheet 2. When the overall area of ​​the explosion-proof sheet 2 is constant, the area of ​​the opening portion 25 formed by the weak area 22 will be too small, affecting the opening pressure of the explosion-proof sheet 2. Furthermore, if the opening area of ​​the explosion-proof sheet 2 is too small after opening, the burst pressure of the explosion-proof sheet 2 will be too low. This makes it easy for the explosion-proof sheet 2 to burst under normal gas generation inside the battery, leading to battery failure and affecting the battery's pressure relief effect. Conversely, if the area of ​​the opening portion 25 formed by the weak area 22 needs to be constant, the overall area of ​​the explosion-proof sheet 2 will be too large. This results in the explosion-proof plate 2 occupying too large an area on the outer casing 1, affecting the layout of other components on the outer casing 1 (especially when the outer casing 1 is a cover plate 6, because the space on the cover plate 6 is relatively small). If a < 1 mm, the distance between the weak area 22 and the edge of the explosion-proof plate 2 is too close. Even with the buffering and vibration reduction effect of the buffer 3, the weak area 22 will still be greatly affected by vibration. Therefore, the possibility of the explosion-proof plate 2 cracking in the weak area 22 is still relatively high, and there will still be abnormal valve opening of the explosion-proof plate 2. The pressure relief effect of the explosion-proof plate 2 and the cost of battery use cannot be guaranteed.

[0038] Optionally, the value of 'a' can be any value from 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm, or a value between any two values.

[0039] In one embodiment, the thermal conductivity of the buffer element 3 ranges from 0.1 W / (m·K) to 0.5 W / (m·K). Therefore, the buffer element 3 can also serve as a heat insulation component.

[0040] It is worth noting that heat is generated during the welding of the explosion-proof sheet 2 to the outer casing 1. The explosion-proof sheet 2 is typically made of metal (such as aluminum or steel), which has high thermal conductivity. When heat is transferred to the weak area 22 of the explosion-proof sheet 2, it can affect the weak area 22, leading to problems such as cracking. Therefore, in this embodiment, a buffer 3 is provided between the edge of the explosion-proof sheet 2 and the weak area 22. The buffer 3 has lower thermal conductivity than metal, thus partially isolating the heat. This reduces the heat transferred to the weak area 22, mitigating its impact and further reducing the possibility of abnormal valve opening of the explosion-proof sheet 2. This further ensures the pressure relief function of the explosion-proof sheet 2 and avoids increased battery usage costs due to accidental damage to the explosion-proof sheet 2.

[0041] Optionally, the thermal conductivity of the buffer 3 can be any value or a value between any two of the following: 0.1 W / (m·K), 0.12 W / (m·K), 0.15 W / (m·K), 0.18 W / (m·K), 0.2 W / (m·K), 0.22 W / (m·K), 0.25 W / (m·K), 0.28 W / (m·K), 0.3 W / (m·K), 0.32 W / (m·K), 0.35 W / (m·K), 0.38 W / (m·K), 0.4 W / (m·K), 0.42 W / (m·K), 0.45 W / (m·K), 0.48 W / (m·K).

[0042] In one embodiment, the material of the buffer element 3 is PP (Polypropylene), which has a thermal conductivity of 0.147 W / (m·K); or, the material of the buffer element 3 may also be PPS (Polyphenylene sulfide), which has a thermal conductivity of 0.299 W / (m·K). PP and PPS materials have good thermal insulation and cushioning properties, thus providing better thermal insulation and vibration damping effects.

[0043] In one embodiment, such as Figure 2 and Figure 5 As shown, the second side of the explosion-proof sheet 2 opposite to the first side 21 has at least one stepped structure 24. In the direction perpendicular to the first surface 12, the thickness of the explosion-proof sheet 2 at the stepped structure 24 is greater than the thickness of the explosion-proof sheet 2 at the weak area 22. The stepped structure 24 is located between the weak area 22 and the edge of the explosion-proof sheet 2. By setting the stepped structure 24 between the weak area 22 and the edge of the explosion-proof sheet 2, the thickness of the explosion-proof sheet 2 at the stepped structure 24 is increased, thereby improving the structural strength of the explosion-proof sheet 2 between the weak area 22 and the edge of the explosion-proof sheet 2, thus achieving a vibration reduction effect. Furthermore, the multi-stage stepped structure 24 can absorb more vibration energy during vibration, which can further improve the vibration reduction effect of the explosion-proof sheet 2, thereby further reducing the impact of the vibration of the outer casing 1 on the explosion-proof sheet 2, which can further reduce the possibility of abnormal valve opening of the explosion-proof sheet 2, thereby further ensuring the pressure relief function of the explosion-proof sheet 2, and further avoiding the increase in battery usage costs due to accidental damage to the explosion-proof sheet 2.

[0044] It is worth noting that in related technologies, the explosion-proof sheet 2 is usually a flat plate structure, that is, the thickness of the area where the weak area 22 is located is the same as the thickness of the area from the weak area 22 to the edge of the explosion-proof sheet 2. However, in this embodiment, by increasing the thickness of the area from the weak area 22 to the edge of the explosion-proof sheet 2 and forming a stepped structure 24, the structural strength of the area from the weak area 22 to the edge of the explosion-proof sheet 2 can be improved, thereby playing a vibration reduction role.

[0045] In one embodiment, such as Figure 5 As shown, in the direction perpendicular to the first surface 12, the projection of the stepped structure 24 onto the first side surface 21 at least partially coincides with the projection of the buffer member 3 onto the first side surface 21. That is, the buffer member 3 and the stepped structure 24 are arranged to correspond completely or at least partially, thereby ensuring the buffering and vibration reduction effect through the synergistic action of the buffer member 3 and the multi-level stepped structure 24. Furthermore, the buffer member 3 can be used to achieve the buffering and vibration reduction effect, while avoiding excessive impact on the structural strength of the explosion-proof sheet 2 due to its arrangement. Therefore, the arrangement of the buffer member 3 and the stepped structure 24 together achieves a better buffering effect.

[0046] It is worth noting that in this embodiment, the groove 23 is opened at the step structure 24 in the direction perpendicular to the first surface 12 (that is, in the thickness direction of the explosion-proof sheet 2). Therefore, it is possible to ensure that the groove 23 has sufficient depth to accommodate the buffer 3, while ensuring that the remaining part of the explosion-proof sheet 2 after the groove 23 is opened has sufficient thickness to ensure the structural strength of the explosion-proof sheet 2.

[0047] According to an embodiment of the present invention, another aspect provides a battery, comprising: the aforementioned battery casing assembly; and a battery cell disposed within the battery casing assembly.

[0048] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery casing assembly, characterized in that, include: The outer casing (1) has a pressure relief port (11), and the outer casing (1) has a first surface (12) formed around the pressure relief port (11); An explosion-proof sheet (2) is connected to the outer shell (1) and covers the pressure relief port (11). The first side (21) of the explosion-proof sheet (2) is attached to the first surface (12). A weak area (22) is formed on the explosion-proof sheet (2). A buffer (3) is disposed between the outer shell (1) and the explosion-proof sheet (2) and is at least partially embedded in the explosion-proof sheet (2). The buffer (3) is disposed on the side of the weak area (22) near the edge of the explosion-proof sheet (2).

2. The battery casing assembly according to claim 1, characterized in that, The explosion-proof sheet (2) has a groove (23) on the first side (21), and the buffer (3) is disposed between the first surface (12) and the first side (21), and the buffer (3) is at least partially embedded in the groove (23).

3. The battery casing assembly according to claim 2, characterized in that, In the direction perpendicular to the first surface (12), the depth to which the buffer (3) is embedded in the groove (23) is h, satisfying 0.1mm≤h≤1mm.

4. The battery casing assembly according to any one of claims 1 to 3, characterized in that, The buffer (3) is continuously arranged in the circumferential direction of the explosion-proof sheet (2).

5. The battery casing assembly according to any one of claims 1 to 3, characterized in that, A plurality of buffer elements (3) are provided at intervals between the weak area (22) and the edge of the explosion-proof sheet (2).

6. The battery casing assembly according to any one of claims 1 to 3, characterized in that, The edge of the explosion-proof sheet (2) is welded to the outer shell (1) to form a weld line (4). On a cross section perpendicular to the first surface (12), the minimum distance between the weak area (22) and the weld line (4) is a, which satisfies 1mm≤a≤8mm.

7. The battery casing assembly according to any one of claims 1 to 3, characterized in that, The explosion-proof sheet (2) has at least one stepped structure (24) on its second side opposite to the first side (21). In a direction perpendicular to the first surface (12), the thickness of the explosion-proof sheet (2) at the stepped structure (24) is greater than the thickness of the explosion-proof sheet (2) at the weak area (22). The stepped structure (24) is located between the weak area (22) and the edge of the explosion-proof sheet (2).

8. The battery casing assembly according to claim 7, characterized in that, In a direction perpendicular to the first surface (12), the projection of the stepped structure (24) on the first side surface (21) at least partially coincides with the projection of the buffer (3) on the first side surface (21).

9. The battery casing assembly according to any one of claims 1 to 3, characterized in that, The battery housing assembly includes a housing (5) and a cover plate (6). The housing (5) has at least one opening. The cover plate (6) is connected to the housing (5) and seals the opening. The housing (5) and the cover plate (6) enclose a receiving space. The outer shell (1) is either the housing (5) or the cover plate (6).

10. The battery casing assembly according to any one of claims 1 to 3, characterized in that, The thermal conductivity of the buffer (3) ranges from 0.1 W / (m·K) to 0.5 W / (m·K).

11. A battery, characterized in that, include: Battery housing assembly as claimed in any one of claims 1 to 10; The battery cell is disposed within the battery casing assembly.

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