Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body, a bearing plate group and an explosion-proof valve, the shell body comprises a first wall surface and a second wall surface which are provided with first mounting holes, the bearing plate group comprises an insulating outer plate and a connecting lining, the explosion-proof valve is accommodated in the first mounting hole, and the second wall surface is provided with a second mounting hole. The length size of a first overlapping area between the connecting lining and the first wall face is L1, the length size of a second overlapping area between the connecting lining and the anti-explosion valve is L2, and L1 / L2 is larger than or equal to 0.5 and smaller than or equal to 2. Connection between the explosion-proof valve and the first wall face is indirectly achieved through the bearing plate set, limitation on the area of the explosion-proof valve is relaxed when the explosion-proof valve is connected, the area of the explosion-proof valve is combined, meanwhile, the connection requirement is met, the ratio of the length size L1 to the length size L2 is limited, the connection strength between the connection lining and the explosion-proof valve is guaranteed, and the service life of the explosion-proof valve is prolonged. And the bearing strength of the connecting lining is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery housing and a battery. Background Art

[0002] For a battery, the battery housing and the electrode assembly are indispensable structures that make up the battery. The electrode assembly and the battery housing together form a complete battery. The electrode assembly is the core component of the battery, responsible for storing and releasing electrical energy. The electrode assembly is mainly composed of a positive electrode material, a negative electrode material, an electrolyte, and a separator. The electrode assembly is the smallest unit of a power battery and also an electrical energy storage unit. It must have a high energy density to store as much electrical energy as possible; the battery housing is a container that encloses the electrode assembly. It not only provides physical protection to prevent the electrode assembly from being affected by the external environment, but also helps the electrode assembly dissipate heat and maintain the stability of the battery. Therefore, the performance of the battery housing has an important impact on the assembly, safety, and performance of the battery.

[0003] Among them, in order to improve the safety performance of a battery cell, an explosion-proof valve is usually provided on the battery cell. When gas is generated inside the battery cell during abnormal operation, the gas can be discharged through the explosion-proof valve, achieving the effect of pressure relief and protection, and avoiding explosion. Usually, the explosion-proof valve is provided on the cover plate, but other circuit components are usually also provided on the cover plate. When the explosion-proof valve is opened due to thermal runaway of the battery cell, since the circuit components and the pressure relief position of the explosion-proof valve are on the same side, there is a risk of fire and explosion due to mutual influence during pressure relief. Therefore, currently, the explosion-proof valve is arranged on the side wall of the housing to solve the above problems.

[0004] In order to ensure that the explosion-proof valve can be smoothly opened and has a sufficient area for exhaust and pressure relief when the battery cell is in thermal runaway, it is necessary to ensure that the area of the explosion-proof valve is large enough. However, the width dimension of the side wall of the housing is usually narrow. Therefore, in order to ensure the smooth welding of the explosion-proof valve and the side wall of the housing, it is necessary to limit the area of the explosion-proof valve. If the area of the explosion-proof valve is to be ensured, it will lead to an increase in the welding difficulty, so that it is impossible to meet both the area requirement of the explosion-proof valve and the welding requirement at the same time. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery housing and a battery that meet the welding requirements while ensuring that the explosion-proof valve has a large opening area.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] On the one hand, a battery housing is provided, and the battery housing includes:

[0008] A shell body, wherein a cavity is provided in the shell body and comprises two first walls arranged opposite to each other and two second walls arranged opposite to each other, wherein the plate area of the first walls is smaller than the plate area of the second walls, and a first mounting hole is provided on any of the first walls;

[0009] A load-bearing plate assembly, the load-bearing plate assembly comprising an insulating outer plate and a connecting inner liner, the insulating outer plate being connected to the first wall surface having the first mounting hole and facing the cavity, the insulating outer plate also having a second mounting hole, the connecting inner liner being connected to the second mounting hole and having an exhaust hole communicating with the first mounting hole;

[0010] an explosion-proof valve, the explosion-proof valve being accommodated in the first mounting hole and connected to a side of the connecting liner facing away from the cavity;

[0011] A first overlapping area is provided between the connecting liner and the first wall surface having the first mounting hole, and the length dimension of the first overlapping area along the first direction is L1. A second overlapping area is provided between the connecting liner and the explosion-proof valve, and the length dimension of the second overlapping area along the first direction is L2, and 0.5≤L1 / L2≤2 is satisfied.

[0012] Optionally, the wall thickness dimension of the first wall surface is T, the thickness dimension of the connecting lining is T1, and T1≥1.5T is satisfied.

[0013] Optionally, the thickness dimension of the insulating outer plate is T2, and satisfies T2 ≥ T1.

[0014] Optionally, the thickness dimension T1 of the connecting lining satisfies, T1 ≥ 0.15 mm;

[0015] Or, the thickness dimension T2 of the insulating outer plate satisfies, T2 ≥ 0.15 mm.

[0016] Optionally, a wall thickness dimension T of the first wall surface satisfies 0.1 mm ≤ T ≤ 0.8 mm.

[0017] Optionally, the first wall surface is connected to the adjacent second wall surface via an arc angle transition.

[0018] Optionally, the radius of the arc angle is R, the width of the insulating outer plate along the first direction is W1, the width between the surfaces of two oppositely arranged second walls facing the cavity is W2, and W2-W1≥2R is satisfied.

[0019] Optionally, a weakened groove is provided on a side of the explosion-proof valve facing away from the cavity.

[0020] Optionally, the weakened groove is included in a projection area formed by the exhaust hole on the explosion-proof valve along the second direction.

[0021] On the other hand, a battery is provided, comprising a cover plate, a pole group and a battery casing as described above, wherein the cover plate is arranged on an open portion of the battery casing and closes the battery casing to form a receiving cavity for receiving the pole group.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a battery casing, wherein a bearing plate group consisting of a connecting liner and an insulating outer plate is arranged in a cavity, and an explosion-proof valve accommodated in a first mounting hole of a first wall is connected to a side of the connecting liner away from the cavity, so that the explosion-proof valve is indirectly connected to the first wall through the bearing plate group, and there is no need to reserve a margin on the first wall for connection with the explosion-proof valve, thereby eliminating the restriction on the area of the explosion-proof valve itself in order to ensure connection with the first wall with a smaller plate area, so that the area of the explosion-proof valve is increased, thereby achieving both the area of the explosion-proof valve and the area of the explosion-proof valve. At the same time, it meets the requirements of welding, has high processability and safety, and by limiting the ratio of the length dimension L1 of the first overlapping area along the first direction to the length dimension L2 of the second overlapping area along the first direction, it is possible to avoid the second overlapping area between the connecting liner and the explosion-proof valve being too small, resulting in poor connection strength. On the other hand, it is possible to avoid the first overlapping area between the connecting liner and the first wall being too small, forming a cantilever beam structure with poor bearing strength, resulting in the connecting liner being easily deformed under force during thermal runaway, resulting in squeezing of the explosion-proof valve and reducing the opening pressure of the explosion-proof valve.

[0024] The present invention also provides a battery, which reduces the difficulty of assembly, improves production efficiency, has higher safety, and improves product quality by applying the above-mentioned battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural exploded view of the battery housing provided by the present invention;

[0026] Figure 2 It is a structural cross-sectional view of a battery housing provided by the present invention where an explosion-proof valve is provided.

[0027] In the figure:

[0028] 1. Shell body; 11. First wall surface; 12. Second wall surface; 13. First mounting hole; 14. Arc angle;

[0029] 2. Load-bearing plate group; 21. Insulating outer plate; 22. Connecting lining; 23. Second mounting hole; 24. Exhaust hole;

[0030] 3. Explosion-proof valve; 31. Weakening groove. Detailed implementation manners

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0032] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes the situation where the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes the situation where the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0034] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for differentiation in description and do not have special meanings.

[0035] Since the available area of the side wall of the housing is small, the explosion-proof valve provided on the side wall of the housing cannot have both the area of the explosion-proof valve and meet the welding requirements at the same time.

[0036] Therefore, in order to ensure that there is enough welding area between the explosion-proof valve provided on the side wall of the housing and the side wall of the housing, and at the same time meet the requirement that the explosion-proof valve has enough area to achieve pressure relief and exhaust when the battery cell undergoes thermal runaway, this embodiment provides a battery housing.

[0037] AsFigures 1 to 2 As shown, the battery housing includes a housing body 1, a bearing plate group 2 and an explosion-proof valve 3. The housing body 1 is provided with a cavity and includes two first walls 11 and two second walls 12 arranged opposite to each other. The plate area of the first wall 11 is smaller than the plate area of the second wall 12. A first mounting hole 13 is provided on any first wall 11. The bearing plate group 2 includes an insulating outer plate 21 and a connecting lining 22. The insulating outer plate 21 is connected to the side of the first wall 11 with the first mounting hole 13 facing the cavity. The insulating outer plate 21 is also provided with a second mounting hole 23. The connecting liner 22 is connected to the second mounting hole 23 and is provided with an exhaust hole 24 connected to the first mounting hole 13. The explosion-proof valve 3 is accommodated in the first mounting hole 13 and is connected to the side of the connecting liner 22 away from the cavity. A first overlapping area is provided between the connecting liner 22 and the first wall surface 11 with the first mounting hole 13, and the length dimension of the first overlapping area along the first direction is L1. A second overlapping area is provided between the connecting liner 22 and the explosion-proof valve 3, and the length dimension of the second overlapping area along the first direction is L2, and 0.5≤L1 / L2≤2 is satisfied.

[0038] The battery housing is provided with a bearing plate group 2 composed of a connecting liner 22 and an insulating outer plate 21 in the cavity, and the explosion-proof valve 3 accommodated in the first mounting hole 13 of the first wall 11 is connected to the side of the connecting liner 22 away from the cavity, so that the explosion-proof valve 3 is indirectly connected to the first wall 11 through the bearing plate group 2, and there is no need to reserve a margin for connecting with the explosion-proof valve 3 on the first wall 11, thereby eliminating the restriction on the area of the explosion-proof valve 3 itself when the explosion-proof valve 3 is connected to the first wall 11 with a smaller plate area, so that the area of the explosion-proof valve 3 is increased, thereby achieving both the area of the explosion-proof valve 3 and the size of the explosion-proof valve 3. At the same time, it meets the requirements of welding, has high processability and safety, and by limiting the ratio of the length dimension L1 of the first overlapping area along the first direction to the length dimension L2 of the second overlapping area along the first direction, it is possible to avoid the second overlapping area between the connecting liner 22 and the explosion-proof valve 3 being too small, resulting in poor connection strength. On the other hand, it is possible to avoid the first overlapping area between the connecting liner 22 and the first wall surface 11 being too small, forming a cantilever beam structure with poor bearing strength, resulting in the connecting liner 22 being easily deformed under force during thermal runaway, resulting in squeezing the explosion-proof valve 3 and reducing the opening pressure of the explosion-proof valve 3.

[0039] Among them, the battery housing provided by the present invention can be applicable to different types of batteries, such as blade batteries or square shell batteries. When adapting to a blade battery, the battery housing is composed of only two relatively arranged first wall surfaces 11 and two relatively arranged second wall surfaces 12, and forms a hollow shell structure with both sides open. When adapting to a square shell battery, in addition to the two relatively arranged first wall surfaces 11 and the two relatively arranged second wall surfaces 12, the battery housing is also provided with a bottom wall and forms a hollow shell structure with one side open. In this embodiment, the battery housing adapts to a blade battery.

[0040] In this embodiment, the connecting lining 22 is made of a metal material, and the explosion-proof valve 3 is connected to the connecting lining 22 by welding. The bearing plate group 2 can be a split structure or an integral structure. When the bearing plate group 2 is a split structure, after the insulating outer plate 21 and the connecting lining 22 are formed separately, the connecting lining 22 is bonded in the second mounting hole 23 of the insulating outer plate 21. When the bearing plate group 2 is an integral structure, the insulating outer plate 21 is directly formed on the outside of the connecting lining 22 by an injection molding process. Among them, the insulating outer plate 21 is made of a plastic material and is fixedly connected to the first wall surface 11 by bonding.

[0041] Optionally, the wall thickness dimension of the first wall surface 11 in the second direction is T, the thickness dimension of the connecting lining 22 in the second direction is T1, and T1≥1.5T is satisfied. By setting the wall thickness dimension of the first wall surface 11 as T and the thickness dimension of the connecting lining 22 as T1, and limiting the relationship between the wall thickness dimension T of the first wall surface 11 and the thickness dimension T1 of the connecting lining 22, so that the two satisfy T1≥1.5T, thereby limiting the thickness of the connecting lining 22 and avoiding the connecting lining 22 being penetrated during welding due to too small a thickness.

[0042] Optionally, the thickness dimension of the insulating outer plate 21 in the second direction is T2, and T2≥T1 is satisfied. By setting the thickness dimension of the insulating outer plate 21 as T2 and limiting the relationship between the thickness dimension T2 of the insulating outer plate 21 and the thickness dimension T1 of the connecting lining 22, so that the two satisfy T2≥T1, thereby ensuring that the thickness of the insulating outer plate 21 can cover the thickness of the connecting lining 22, thus playing an insulating and protective role.

[0043] Optionally, the thickness dimension T1 of the connecting inner lining 22 satisfies T1≥0.15 mm, or the thickness dimension T2 of the insulating outer plate 21 satisfies T2≥0.15 mm. By defining the thickness dimension T1 of the connecting inner lining 22 or the thickness dimension T2 of the insulating outer plate 21, such that T1≥0.15 mm or T2≥0.15 mm, the minimum thickness of the bearing plate group 2 composed of the connecting inner lining 22 and the insulating outer plate 21 is determined, avoiding a situation where the thickness of the bearing plate group 2 is too small, resulting in weak structural strength or being penetrated when welding the explosion-proof valve 3 to the connecting inner lining 22.

[0044] Optionally, the wall thickness dimension T of the first wall surface 11 satisfies 0.1 mm≤T≤0.8 mm. By defining the thickness dimension T of the first wall surface 11, on the one hand, it is possible to avoid the situation where the thickness dimension T of the first wall surface 11 is too small, resulting in weak structural strength of the first wall surface 11 and being unable to effectively provide a protective effect. On the other hand, due to the presence of the bearing plate group 2, it is possible to avoid the situation where the thickness dimension T of the first wall surface 11 is too large, resulting in material waste and increased manufacturing costs.

[0045] In this embodiment, in order to confirm the influence of the relevant parameter settings of the length dimension L1 of the first overlapping region in the first direction, the length dimension L2 of the second overlapping region in the first direction, the wall thickness dimension T of the first wall surface 11, the thickness dimension T1 of the connecting inner lining 22, and the thickness dimension T2 of the insulating outer plate 21 on the battery housing provided with the bearing plate group 2, two mutually comparative Tables 1 and 2 are designed for verification.

[0046] The specific test method is as follows: by welding and assembling each part of the battery housing provided in this embodiment, and observing whether the connecting inner lining 22 is penetrated during welding. After welding is completed, measure the flatness of the surface at the welding joint and observe whether there is any depression. If the flatness is less than 0.3 mm, it is qualified; if the flatness is higher than 0.3 mm, it is unqualified. The reason for also confirming whether there is a depression after welding is that if there is an inner depression after the explosion-proof valve 3 is welded, it will cause a risk of deformation of the explosion-proof valve 3, reducing the pressure resistance strength of the explosion-proof valve 3, that is, the opening pressure and service life of the explosion-proof valve 3 do not meet the design requirements.

[0047] Table 1

[0048]

[0049] In Embodiment 1, the length dimension L1 of the first overlapping region in the first direction is set to 0.5 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.15 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.1 mm. At this time, the ratio between T1 and T, T1 / T, is 1.5, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.25 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0050] In Embodiment 2, the length dimension L1 of the first overlapping region in the first direction is set to 0.5 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.625, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.2 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.1 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.14 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0051] In Embodiment 3, the length dimension L1 of the first overlapping region in the first direction is set to 0.5 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.5, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.35 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.1 mm. At this time, the ratio between T1 and T, T1 / T, is 3.5, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.21 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0052] In Embodiment 4, the length dimension L1 of the first overlapping region in the first direction is set to 0.7 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.4, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.4 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.25 mm. At this time, the ratio between T1 and T, T1 / T, is 1.6, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.07 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0053] In Embodiment 5, the length dimension L1 of the first overlapping region in the first direction is set to 0.9 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.8, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.5 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.25 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.15 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0054] In Embodiment 6, the length dimension L1 of the first overlapping region in the first direction is set to 1 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.55 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.25 mm. At this time, the ratio between T1 and T, T1 / T, is 2.2, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.23 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0055] In Example 7, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.68 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.45 mm. At this time, the ratio between T1 and T, T1 / T, is 1.51, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.24 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0056] In Example 8, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.667, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.8 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.45 mm. At this time, the ratio between T1 and T, T1 / T, is 1.78, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.21 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0057] In Example 9, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.6 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.5, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.9 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.45 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.03 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0058] In Embodiment 10, the length dimension L1 of the first overlapping region in the first direction is set to 1.2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.5, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 0.9 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.6 mm. At this time, the ratio between T1 and T, T1 / T, is 1.5, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.22 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0059] In Embodiment 11, the length dimension L1 of the first overlapping region in the first direction is set to 1.4 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.75, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 1.05 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.6 mm. At this time, the ratio between T1 and T, T1 / T, is 1.75, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.17 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0060] In Embodiment 12, the length dimension L1 of the first overlapping region in the first direction is set to 1.6 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2. The thickness dimension T1 of the connecting lining 22 is set to 1.3 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.6 mm. At this time, the ratio between T1 and T, T1 / T, is 2.17, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.18 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0061] In Embodiment 13, the length dimension L1 of the first overlapping region in the first direction is set to 1.2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.2 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.75 mm. At this time, the ratio between T1 and T, T1 / T, is 1.6, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.04 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0062] In Embodiment 14, the length dimension L1 of the first overlapping region in the first direction is set to 1.2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.6 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.75, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.35 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.75 mm. At this time, the ratio between T1 and T, T1 / T, is 1.8, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.26 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0063] In Embodiment 15, the length dimension L1 of the first overlapping region in the first direction is set to 1.2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 2.4 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.5, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.5 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.75 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.21 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0064] In Embodiment 16, the length dimension L1 of the first overlapping region in the first direction is set to 1.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.5, satisfying the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.2 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.8 mm. At this time, the ratio between T1 and T, T1 / T, is 1.5, satisfying the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.23 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0065] In Embodiment 17, the length dimension L1 of the first overlapping region in the first direction is set to 2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.66, satisfying the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.45 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.8 mm. At this time, the ratio between T1 and T, T1 / T, is 1.81, satisfying the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.09 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0066] In Embodiment 18, the length dimension L1 of the first overlapping region in the first direction is set to 2.4 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2, satisfying the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.8 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.8 mm. At this time, the ratio between T1 and T, T1 / T, is 2.25, satisfying the range of T1 ≥ 1.5T. At this time, after measurement, the flatness of the welding joint is 0.18 mm, which is less than 0.3 mm, and no depression is found. Moreover, during the welding process, the connecting lining 22 is not penetrated. Therefore, it meets the design requirements and the product is qualified.

[0067] As can be seen from Embodiments 1 to 18, when the ratio between the length dimension L1 of the first overlapping region in the first direction and the length dimension L2 of the second overlapping region in the first direction meets the set range, and the ratio between the thickness dimension T1 of the connecting lining 22 and the wall thickness dimension T of the first wall surface 11 meets the set range, after welding the explosion-proof valve 3, the flatness of the surface of the battery housing provided in this embodiment is less than 0.3 mm, no inner concavity appears in the explosion-proof valve 3, and during the welding process, the connecting lining 22 is not penetrated, meeting the design requirements.

[0068] Table 2

[0069]

[0070] In Comparative Example 1, the length dimension L1 of the first overlapping region in the first direction is set to 0.5 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.417, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.3 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.1 mm. At this time, the ratio between T1 and T, T1 / T, is 3, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welded joint is 0.33 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0071] In Comparative Example 2, the length dimension L1 of the first overlapping region in the first direction is set to 0.5 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.33, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.5 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.25 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welded joint is 0.42 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0072] In Comparative Example 3, the length dimension L1 of the first overlapping region in the first direction is set to 1.1 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2.2, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.45 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.3 mm. At this time, the ratio between T1 and T, T1 / T, is 1.5, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welded joint is 0.37 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0073] In Comparative Example 4, the length dimension L1 of the first overlapping region in the first direction is set to 1.3 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2.6, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.6 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.4 mm. At this time, the ratio between T1 and T, T1 / T, is 1.5, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welding joint is 0.38 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0074] In Comparative Example 5, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.44, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.5 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welding joint is 0.43 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0075] In Comparative Example 6, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 2.0 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.4, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.6 mm. At this time, the ratio between T1 and T, T1 / T, is 1.67, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welding joint is 0.52 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0076] In Comparative Example 7, the length dimension L1 of the first overlapping region in the first direction is set to 1.7 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2.12, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.4 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.7 mm. At this time, the ratio between T1 and T, T1 / T, is 2, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 was not penetrated, but after measurement, the flatness of the welded joint is 0.37 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0077] In Comparative Example 8, the length dimension L1 of the first overlapping region in the first direction is set to 1.9 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2.37, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.5 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.8 mm. At this time, the ratio between T1 and T, T1 / T, is 1.875, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 was not penetrated, but after measurement, the flatness of the welded joint is 0.38 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0078] In Comparative Example 9, the length dimension L1 of the first overlapping region in the first direction is set to 1.2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 2.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.48, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.95 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.6 mm. At this time, the ratio between T1 and T, T1 / T, is 1.58, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 was not penetrated, but after measurement, the flatness of the welded joint is 0.43 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0079] In Comparative Example 10, the length dimension L1 of the first overlapping region in the first direction is set to 1.2 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 2.6 mm. At this time, the ratio between L1 and L2, L1 / L2 is 0.462, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.75 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.45 mm. At this time, the ratio between T1 and T, T1 / T is 1.67, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welded joint is 0.32 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0080] In Comparative Example 11, the length dimension L1 of the first overlapping region in the first direction is set to 2.5 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2 is 2.08, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.5 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.3 mm. At this time, the ratio between T1 and T, T1 / T is 1.67, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welded joint is 0.37 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0081] In Comparative Example 12, the length dimension L1 of the first overlapping region in the first direction is set to 3 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1.2 mm. At this time, the ratio between L1 and L2, L1 / L2 is 2.5, which does not satisfy the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.6 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.2 mm. At this time, the ratio between T1 and T, T1 / T is 3, which satisfies the range of T1 ≥ 1.5T. During the welding process, the connecting lining 22 is not penetrated, but after measurement, the flatness of the welded joint is 0.38 mm, which is greater than 0.3 mm, and a depression is found. Therefore, it does not meet the design requirements and the product is unqualified.

[0082] As can be seen from Comparative Examples 1 to 12, when the ratio between the length dimension L1 of the first overlapping region in the first direction and the length dimension L2 of the second overlapping region in the first direction does not meet the set range, it is found that the flatness after welding is greater than 0.3 mm, and the explosion-proof valve 3 has a concave inward. Therefore, it does not meet the design requirements and the product is unqualified. However, since the ratio between the thickness dimension T1 of the connecting lining 22 and the wall thickness dimension T of the first wall surface 11 meets the set range, during the welding process of the battery housing provided in this embodiment, the connecting lining 22 is not penetrated, meeting the process requirements.

[0083] In Comparative Example 13, the length dimension L1 of the first overlapping region in the first direction is set to 0.6 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.75, meeting the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.15 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.15 mm. At this time, the ratio between T1 and T, T1 / T, is 1, not meeting the range of T1 ≥ 1.5T. After measurement, the flatness of the welding joint is 0.13 mm, which is less than 0.3 mm, and no depression is found. However, during the welding process, the connecting lining 22 is penetrated, and thus it does not meet the welding process requirements and the product is unqualified.

[0084] In Comparative Example 14, the length dimension L1 of the first overlapping region in the first direction is set to 0.6 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 1 mm. At this time, the ratio between L1 and L2, L1 / L2, is 0.6, meeting the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.25 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.2 mm. At this time, the ratio between T1 and T, T1 / T, is 1.25, not meeting the range of T1 ≥ 1.5T. After measurement, the flatness of the welding joint is 0.06 mm, which is less than 0.3 mm, and no depression is found. However, during the welding process, the connecting lining 22 is penetrated, and thus it does not meet the welding process requirements and the product is unqualified.

[0085] In Comparative Example 15, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1, satisfying the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.45 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.35 mm. At this time, the ratio between T1 and T, T1 / T, is 1.29, not satisfying the range of T1 ≥ 1.5T. After measurement, the flatness of the welding joint is 0.21 mm, which is less than 0.3 mm, and no depression is found. However, during the welding process, the connecting lining 22 is penetrated, and thus does not meet the welding process requirements, and the product is unqualified.

[0086] In Comparative Example 16, the length dimension L1 of the first overlapping region in the first direction is set to 0.8 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.6 mm. At this time, the ratio between L1 and L2, L1 / L2, is 1.33, satisfying the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.65 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.45 mm. At this time, the ratio between T1 and T, T1 / T, is 1.44, not satisfying the range of T1 ≥ 1.5T. After measurement, the flatness of the welding joint is 0.11 mm, which is less than 0.3 mm, and no depression is found. However, during the welding process, the connecting lining 22 is penetrated, and thus does not meet the welding process requirements, and the product is unqualified.

[0087] In Comparative Example 17, the length dimension L1 of the first overlapping region in the first direction is set to 1 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.5 mm. At this time, the ratio between L1 and L2, L1 / L2, is 2, satisfying the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 0.85 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.6 mm. At this time, the ratio between T1 and T, T1 / T, is 1.42, not satisfying the range of T1 ≥ 1.5T. After measurement, the flatness of the welding joint is 0.16 mm, which is less than 0.3 mm, and no depression is found. However, during the welding process, the connecting lining 22 is penetrated, and thus does not meet the welding process requirements, and the product is unqualified.

[0088] In Comparative Example 18, the length dimension L1 of the first overlapping region in the first direction is set to 1 mm, and the length dimension L2 of the second overlapping region in the first direction is set to 0.8 mm. At this time, the ratio between L1 and L2, L1 / L2 is 1.25, which satisfies the range of 0.5 ≤ L1 / L2 ≤ 2; the thickness dimension T1 of the connecting lining 22 is set to 1.15 mm, and the wall thickness dimension T of the first wall surface 11 is set to 0.8 mm. At this time, the ratio between T1 and T, T1 / T is 1.44, which does not satisfy the range of T1 ≥ 1.5T. After measurement, the flatness of the welded joint is 0.09 mm, which is less than 0.3 mm, and no depression is found. However, during the welding process, the connecting lining 22 is penetrated, so it does not meet the welding process requirements and the product is unqualified.

[0089] It can be seen from Comparative Example 13 to Comparative Example 18 that when the ratio between the length dimension L1 of the first overlapping region in the first direction and the length dimension L2 of the second overlapping region in the first direction meets the set range, the flatness after welding is less than 0.3 mm, and the explosion-proof valve 3 does not show internal concavity. However, since the ratio between the thickness dimension T1 of the connecting lining 22 and the wall thickness dimension T of the first wall surface 11 does not meet the set range, during the welding process of the battery housing provided in this embodiment, the connecting lining 22 is penetrated and does not meet the process requirements.

[0090] Optionally, the first wall surface 11 and the adjacent second wall surface 12 are connected through a fillet 14 for transition. By connecting the first wall surface 11 and the adjacent second wall surface 12 through the fillet 14 for transition, on the one hand, the connection part is made more smooth, and on the other hand, the stress concentration generated by the right-angle connection is eliminated, improving the strength of the structure.

[0091] Furthermore, the radius dimension of the fillet 14 is R, the width dimension of the insulating outer plate 21 in the first direction is W1, and the width dimension between the surfaces of the two relatively arranged second wall surfaces 12 facing the cavity is W2, and it satisfies W2 - W1 ≥ 2R. By setting the radius dimension of the fillet 14 to R, the width dimension of the insulating outer plate 21 in the first direction to W1, and the width dimension between the surfaces of the two relatively arranged second wall surfaces 12 facing the cavity to W2, and making the three satisfy W2 - W1 ≥ 2R, the width dimension W1 of the insulating outer plate 21 in the first direction is limited to avoid the width dimension W1 being too large and causing interference with the fillet 14 between the first wall surface 11 and the second wall surface 12.

[0092] Optionally, the weakening groove 31 is included in the projection area formed by the exhaust hole 24 on the explosion-proof valve 3 along the second direction. By including the weakening groove 31 in the projection area formed by the exhaust hole 24 on the explosion-proof valve 3 along the second direction, it is ensured that when thermal runaway occurs, the area after the weakening groove 31 is blown open by the gas can be fully utilized, avoiding overlap between the weakening groove 31 and the connecting lining 22, resulting in partial areas of the weakening groove 31 being blocked by the connecting lining 22, and causing the actual area of the weakening groove 31 used for pressure relief and exhaust to be smaller than its set area.

[0093] In this embodiment, a battery is further provided. The battery includes a cover plate, a pole group, and the above-mentioned battery housing. The cover plate is disposed on the open end of the battery housing and closes the battery housing to form a receiving cavity for receiving the pole group. By applying the above-mentioned battery housing, the assembly difficulty of the battery is reduced, the production efficiency is improved, and it has high safety, thus enhancing the product quality.

[0094] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery housing, characterized in that, The battery housing includes: A housing body, which has a cavity inside, and includes two relatively arranged first wall surfaces and two relatively arranged second wall surfaces. The plate area of the first wall surface is smaller than that of the second wall surface, and a first mounting hole is provided on any one of the first wall surfaces; A carrier plate group, which includes an insulating outer plate and a connecting inner lining. The insulating outer plate is connected to the side of the first wall surface with the first mounting hole facing the cavity. A second mounting hole is also provided on the insulating outer plate. The connecting inner lining is connected to the second mounting hole and has an exhaust hole communicating with the first mounting hole; An explosion-proof valve, which is received in the first mounting hole and is connected to the side of the connecting inner lining facing away from the cavity; A first overlapping area is provided between the connecting inner lining and the first wall surface with the first mounting hole. The length dimension of the first overlapping area in the first direction is L1. A second overlapping area is provided between the connecting inner lining and the explosion-proof valve. The length dimension of the second overlapping area in the first direction is L2, and it satisfies 0.5 ≤ L1 / L2 ≤ 2.

2. The battery housing according to claim 1, characterized in that, The wall thickness dimension of the first wall surface is T, and the thickness dimension of the connecting inner lining is T1, and it satisfies T1 ≥ 1.5T.

3. The battery housing according to claim 2, characterized in that, The thickness dimension of the insulating outer plate is T2, and it satisfies T2 ≥ T1.

4. The battery housing according to claim 3, characterized in that, The thickness dimension T1 of the connecting inner lining satisfies T1 ≥ 0.15 mm; Or, the thickness dimension T2 of the insulating outer plate satisfies T2 ≥ 0.15 mm.

5. The battery housing according to claim 2, wherein, The wall thickness dimension T of the first wall surface satisfies 0.1 mm ≤ T ≤ 0.8 mm.

6. The battery housing according to claim 1, characterized in that, The first wall surface and the adjacent second wall surface are connected by a fillet transition.

7. The battery housing according to claim 6, characterized in that, The radius dimension of the fillet is R, the width dimension of the insulating outer plate in the first direction is W1, and the width dimension between the surfaces of the two relatively arranged second wall surfaces facing the cavity is W2, and it satisfies W2 - W1 ≥ 2R.

8. The battery housing according to claim 1, characterized in that, A weakening groove is provided on the side of the explosion-proof valve facing away from the cavity.

9. The battery housing according to claim 8, characterized in that, The weakening groove is included in the projection area formed by the exhaust hole on the explosion-proof valve in the second direction.

10. A battery, characterized in that, The battery includes a cover plate, a pole group, and the battery housing according to any one of claims 1-9. The cover plate covers the open end of the battery housing and closes the battery housing to form a receiving cavity for receiving the pole group.

Images