Battery case and battery

Abstract

Battery housing, characterized in that it has the following features: a housing body (1) having an opening, a cover plate (2) that seals the opening to form a receiving space, wherein the cover plate (2) has a cover plate body (201) and a folded edge (202) arranged at an edge of the cover plate body (201), the folded edge (202) extending in a direction away from the receiving space, the folded edge (202) being welded to the housing body (1), a weld area (204) being formed at a position where the folded edge (202) and the housing body (1) are welded in the direction of extension of the folded edge (202), the cover plate body (201) being arranged on a side of the weld area (204) close to the receiving space in a direction perpendicular to an upper surface of the cover plate body (201),a distance from a side of the weld area (204) located near the receiving space to the upper surface of the cover plate body (201) is defined as h, and a distance from a side of the folded edge (202) facing away from the receiving space to a side of the cover plate body (201) located near the receiving space is defined as H, where 0.17 ≤ h / H ≤ 0.5.

Description

TECHNICAL AREA

[0001] The present application relates to the field of battery technology, in particular a battery housing and a battery. BACKGROUND

[0002] With the increasing maturity of lithium-ion battery technology, the use of lithium-ion batteries as high-performance batteries in electric vehicles and energy storage applications is becoming ever more widespread. A lithium-ion battery pack typically contains multiple batteries, with existing batteries generally categorized as cylindrical, pouch, and prismatic.

[0003] An existing prismatic battery consists of a battery casing and a battery cell located within the casing. The battery casing comprises a body and a cover plate, which are welded together. During thermal runaway, the weld between the body and the cover plate is easily damaged, causing the entire cover plate to detach from the body. This can trigger thermal runaway in other batteries, potentially leading to fire and explosion of the battery pack and posing significant safety risks. SUMMARY

[0004] In view of this, the present invention provides a battery housing and a battery to solve the problem that the weld between the housing body and the cover plate is easily damaged during a thermal runaway of the battery, causing the cover plate to detach from the housing body.

[0005] In a first aspect, the present invention provides a battery housing comprising: a housing body with an opening, a cover plate sealing the opening to form a receiving space, the cover plate comprising a cover plate body and a folded edge arranged at an edge of the cover plate body, the folded edge extending in a direction away from the receiving space, the folded edge being welded to the housing body, a weld area being formed at a position where the folded edge and the housing body are welded in the direction of extension of the folded edge, the cover plate body being arranged on a side of the weld area close to the receiving space in a direction perpendicular to an upper surface of the cover plate body,a distance from a side of the weld area located near the receiving space to the upper surface of the cover plate body is defined as h, and a distance from a side of the folded edge facing away from the receiving space to a side of the cover plate body located near the receiving space is defined as H, where 0.17 ≤ h / H ≤ 0.5.

[0006] In a second aspect, the present invention further provides a battery comprising the aforementioned battery housing and a battery cell arranged in the receiving space of the battery housing.

[0007] Advantageous effects: The casing and the folded edge of the cover plate are welded together. If the ratio of h to H is too small when the cover plate is subjected to a force, the force is quickly transferred to the weld, causing the weld to crack without providing any buffering effect. This weakens the buffering effect, and in the event of thermal runaway, the cover plate can easily detach from the casing, posing significant safety risks. If the ratio of h to H is too large, the space occupied by the cover plate within the casing is large, which affects the energy density of a single battery and thus its performance.

[0008] With a ratio of h to H in the range of 0.17 to 0.5, the cover plate can provide a buffering effect and prevent separation between the cover plate and the casing during thermal runaway. This can, to some extent, solve the problem of the weld position between the casing and the cover plate being easily damaged during thermal runaway of the battery, causing the cover plate to detach from the casing. At the same time, the overall height of the cover plate is controlled to ensure the internal space of the casing and thus the energy density of a single battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To more clearly illustrate the technical solutions in the specific embodiments of the present invention or the prior art, the drawings required to describe the specific embodiments or the prior art are briefly introduced below. It is understood that the drawings described below represent some embodiments of the present invention and that a person skilled in the art can create other drawings based on these drawings without any creative effort. Fig. Figure 1 shows a battery housing according to an embodiment of the present invention in a perspective view. Fig. 2 shows that in Fig. 1 Battery housing shown in a top view. Fig. 3 shows this in Fig. 2 battery cases shown in a cross-sectional view along AA. Fig. 4 shows B in Fig. 3 in an enlarged partial view. Reference numbers: 1 Housing body, 2 Cover plate, 201 Cover plate bodies, 202 folded edge, 203 Transition section, 204 Welding area. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0010] To clarify the objectives, technical solutions, and advantages of the embodiments of the present invention, the technical solutions in these embodiments are described clearly and completely in conjunction with the drawings. It is obvious that the described embodiments represent only a subset of the embodiments of the present invention and not all of them. Starting from the embodiments of the present invention, all other embodiments that a person skilled in the art could create without ingenuity fall within the scope of protection of the present invention.

[0011] The following description refers to Fig. 1 to 4 describe an embodiment of the present invention.

[0012] According to one embodiment of the present invention, in one aspect a battery housing is provided which has the following: a housing body 1 with an opening, a cover plate 2 which seals the opening to form a receiving space, wherein the cover plate 2 has a cover plate body 201 and a folded edge 202 which is arranged on an edge of the cover plate body 201, wherein the folded edge 202 extends in a direction away from the receiving space, wherein the folded edge 202 is welded to the housing body 1, a weld area 204 is formed at a position where the folded edge 202 and the housing body 1 are welded in the direction of extension of the folded edge 202, the cover plate body 201 is arranged on a side of the weld area 204 located near the receiving space in a direction extending perpendicular to an upper surface of the cover plate body 201,a distance from a side of the weld area 204 located near the receiving space to the upper surface of the cover plate body 201 is defined as h, and a distance from a side of the folded edge 202 facing away from the receiving space to a side of the cover plate body 201 located near the receiving space is defined as H, where 0.17 ≤ h / H ≤ 0.5.

[0013] In this embodiment of the battery housing, the housing body 1 and the folded edge 202 of the cover plate 2 are welded together. If the ratio of h to H is too small when the cover plate 201 is subjected to a force, the load is quickly transferred to the weld, causing the weld to crack without providing any buffering effect. This weakens the buffering effect, and in the event of thermal runaway, the cover plate can easily detach from the housing body, posing significant safety risks. If the ratio of h to H is too large, the space occupied by the cover plate within the housing body is large, which affects the energy density of a single battery and thus the battery performance.

[0014] With a ratio of h to H in the range of 0.17 to 0.5, the cover plate 2 can therefore provide a buffering effect and prevent separation between the cover plate 2 and the housing body 1 during thermal runaway. This can, to a certain extent, solve the problem that the weld position between the housing body 1 and the cover plate 2 is easily damaged during thermal runaway of the battery, causing the cover plate 2 to detach from the housing body 1. At the same time, the overall height of the cover plate 2 is controlled to ensure the internal space of the housing body 1 and thus the energy density of a single battery.

[0015] In particular, the ratio h / H may preferably be 0.2, 0.25, 0.3, 0.35, 0.4 or 0.45.

[0016] Furthermore, H lies within a range of 0.5 mm to 4 mm. If H is too large, this indicates that the overall height of the cover plate 2 is large and that the cover plate 2 occupies a large space within the housing body 1, which affects the energy density of a single battery and the battery performance. If H is too small, this indicates that the overall height of the cover plate 2 is small, which reduces the weld area 204 and makes the weld between the folded edge 202 and the housing body 1 unstable, thus making it easy for the cover plate 2 to detach from the housing body 1 when subjected to force, posing significant safety risks.

[0017] Therefore, if H is in the range of 0.5 mm to 4 mm, this not only ensures a stable weld between the folded edge 202 and the housing body 1, but also controls the space occupied by the cover plate 2, which ensures the energy density of the battery.

[0018] In particular, H may preferably be 1 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 3 mm, 3.2 mm, 3.5 mm or 3.8 mm.

[0019] In one embodiment, h lies in a range of 0.1 mm to 1 mm. If h is too large, the height of the cover plate 2 is excessive, and the cover plate 2 occupies a large space within the housing body 1, which significantly impacts the height of the battery cell within the housing body 1 and thus the battery performance. If h is too small, when the cover plate 201 is subjected to a force, the load is rapidly transferred to the weld, causing the weld to crack without providing any cushioning effect, and the cover plate 2 can easily detach from the housing body 1 in the event of thermal runaway.

[0020] If h is set to a range of 0.1 mm to 1 mm, i.e., if h is within a suitable range, the height of the cover plate 2 is therefore within a suitable range, providing a buffering effect and minimizing the impairment of the battery cell performance. This makes it less likely that the cover plate 2 will detach from the housing body 1 during a thermal runaway, thus resolving to some extent the problem of the weld position between the housing body 1 and the cover plate 2 being easily damaged during a thermal runaway of the battery, causing the cover plate 2 to detach from the housing body 1.

[0021] In particular, h may preferably be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm or 0.9 mm.

[0022] As in Fig. As shown in Figure 4, the ratio of the thickness T1 of the folded edge 202 to the thickness T2 of the housing body 1 is 1.2:1 to 3:1 in one embodiment. The thickness of the folded edge 202 refers to the distance between the inner and outer sides of the folded edge 202, i.e., the horizontal dimension of the folded edge 202. Fig. 4, and the thickness of the housing body 1 refers to the distance between the inner side surface and the outer side surface of the housing body 1, i.e., the horizontal dimension of the housing body 1 in Fig. 4.

[0023] If the ratio of the thickness T1 of the folded edge 202 to the thickness T2 of the casing body 1 is too small, there is a high risk of weld failure during welding, which affects the sealing performance and reduces the mechanical strength of the welded area, potentially damaging the battery when subjected to external forces during use. Conversely, if the ratio of the thickness T1 of the folded edge 202 to the thickness T2 of the casing body 1 is too large, this leads to increased welding, making it difficult to control the welded area 204 and affecting the buffering capacity.

[0024] If the ratio of the thickness T1 of the folded edge 202 to the thickness T2 of the housing body 1 is in the range of 1.2:1 to 3:1, then the weld strength between the housing body 1 and the cover plate 2 is good, which ensures the sealing performance while also allowing control of the weld area 204 and maintaining the buffer performance.

[0025] In particular, the ratio of the thickness T1 of the folded edge 202 to the thickness T2 of the housing body 1 may preferably be 1.5:1, 1.8:1, 2:1, 2.2:1 or 2.5:1.

[0026] Furthermore, the thickness of the housing body 1 at the opening ranges from 0.1 mm to 0.5 mm. If the housing body 1 is too thick, this increases the overall weight of the battery, which affects the weight of electric vehicles. A thicker housing body 1 requires more material, thus increasing manufacturing costs and taking up more space, which may be unsuitable for space-constrained applications. If the housing body 1 is too thin, it has lower mechanical strength compared to thicker housing bodies and is easily deformed or damaged by external forces. A thinner housing 1 cannot protect the battery cell as well and cannot effectively prevent damage to the battery cell from external shocks or pressure.

[0027] Therefore, with a thickness of the housing body 1 at the opening in the range of 0.1 mm to 0.5 mm, the strength of the housing body 1 can be ensured and material costs, manufacturing costs and space requirements can be controlled.

[0028] In particular, the thickness of the housing body 1 at the opening can preferably be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.48 mm.

[0029] Furthermore, the thickness range of the folded edge 202 is 0.2 mm to 0.9 mm. If the thickness of the folded edge 202 is too small, this can easily lead to burn-through of the folded edge 202 during welding between the housing body 1 and the folded edge 202, resulting in the formation of weld slag and compromising the battery's safety. If the folded edge 202 is too thick, the thicker folded edge 202 requires more material, leading to a higher overall weight of the cover plate 2 and the need for more material, thus increasing manufacturing costs.

[0030] Thus, the thickness of the folded edge 202 in the range of 0.2 mm to 0.9 mm ensures weld strength after welding the housing body 1 and the cover plate 2, guarantees good sealing performance, and facilitates control over material consumption and costs.

[0031] In particular, the thickness of the folded edge 202 may preferably be 0.3 mm, 0.4 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm or 0.8 mm.

[0032] As in Fig. As shown in Figure 4, in one embodiment the upper end of the opening of the housing body 1 is not higher than the upper end of the folded edge 202, which means that the upper end of the opening of the housing body 1 is lower than the upper end of the folded edge 202 or that the upper end of the opening of the housing body 1 is flush with the upper end of the folded edge 202. This embodiment allows the cover plate 2 to be positioned during installation, which improves assembly efficiency.

[0033] Preferably, the upper end of the opening of the housing body 1 is lower than the upper end of the folded edge 202, which provides a better positioning effect of the cover plate 2 during assembly and reduces assembly difficulties.

[0034] In one embodiment, 0.17 ≤ h / H ≤ 0.35. If the upper end of the opening of the housing body 1 is lower than the upper end of the folded edge 202, space must be reserved for the welding area 204, which therefore requires that the value of h be reduced to meet the weld strength requirements, thereby improving the reliability of the battery and ensuring better sealing performance at the welding position to prevent leakage of liquid or gas.

[0035] As in Fig. As shown in Figure 4, in one embodiment the cover plate body 201 is connected to the folded edge 202 via an arc-shaped transition section 203, wherein the arc radius R of the arc-shaped transition section 203 and h satisfy the following relationship: 0.5 mm ≤ R+h ≤ 1 mm. The arc radius R of the arc-shaped transition section 203 refers to the arc radius of the arc-shaped transition section 203 that connects the cover plate body 201 and the folded edge 202 on the side of the cover plate 2 facing away from the receiving space.

[0036] If R+h is too small, the buffering capacity is poor, which can cause the cover plate 2 to detach easily from the housing body 1 during thermal runaway. If R+h is too large, the distance over which the cover plate 2 extends into the housing body 1 is too great, resulting in a smaller receiving area for the battery cell in the housing body 1 and thus reducing the energy density of a single battery.

[0037] Therefore, the arc-shaped transition section 203 can improve the buffering performance. If the relationship is satisfied, it not only ensures the weld strength between the housing body 1 and the folded edge 202, but also the buffering performance, which prevents the cover plate 2 from detaching from the housing body 1 during thermal runaway, and reduces the distance from the weld area 204 to the cover plate 201, which indirectly reduces the distance over which the cover plate 2 extends into the housing body 1, thus ensuring the area of ​​the receiving space for the battery cell and maintaining the performance of the individual battery.

[0038] In particular, R+h can preferably be 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm or 0.9 mm.

[0039] In one embodiment, the arc radius R lies in a range of 0.2 mm to 0.8 mm. If the arc radius R is too large, the overall height of the cover plate 2 is excessive and occupies too much space. If the arc radius R is too small, the intersection point between the folded edge 202 and the cover plate body 201 becomes almost perpendicular, quickly causing a stress concentration at the intersection point. This reduces the structural strength of the cover plate 2 and affects its service life and stability.

[0040] If the arc radius R is in the range of 0.2 mm to 0.8 mm, it can therefore control the space occupied by the cover plate 2 while avoiding stress concentration and improving the structural strength of the cover plate 2.

[0041] In particular, the arc radius R can preferably be 0.3 mm, 0.4 mm, 0.55 mm, 0.5 mm, 0.6 mm, 0.65 mm, 0.7 mm or 0.75 mm.

[0042] In one embodiment, the thickness of the arc-shaped transition section 203 is 90% to 99% of the thickness of the folded edge 202. The reduced thickness of the arc-shaped transition section 203 facilitates the formation of the folded edge 202, reduces machining difficulties and costs, and also provides a buffering effect and improves structural stability.

[0043] Furthermore, the thickness range of the arc-shaped transition section 203 is 0.35 mm to 0.55 mm. The thickness of the arc-shaped transition section 203 can preferably be 0.4 mm, 0.45 mm, 0.45 mm or 0.5 mm.

[0044] As in Fig. As shown in Figure 4, in one embodiment the weld area 204 between the housing body 1 and the folded edge 202 is spaced apart from the arcuate transition section 203, meaning that the weld area 204 does not overlap the transition section 203. A gap exists between the arcuate transition section 203 and the housing body 1. To ensure weld quality, the weld area 204 and the arcuate transition section 203 are spaced apart, thereby ensuring weld reliability between the housing body 1 and the cover plate 2, as well as overall structural strength.

[0045] In one embodiment, a terminal post is arranged on the cover plate 2, and 0.20 ≤ h / H ≤ 0.5 applies. When a terminal post is arranged on the cover plate 2, the minimum value of h must be increased to reduce the effect of welding heat on the terminal post, thereby ensuring a reliable connection between the terminal and other components and avoiding poor contact due to thermal deformation of the terminal, thus ensuring the stability and reliability of the electrical connection.

[0046] In one embodiment, an explosion-proof valve is arranged on the cover plate 2, and 0.23 ≤ h / H ≤ 0.5 applies. When an explosion-proof valve is arranged on the cover plate 2, the minimum value of h is increased to reduce the effect of the welding heat on the explosion-proof valve, which reduces the risk of damage to the explosion-proof valve due to overheating, ensures its normal operation in emergencies, avoids deterioration of material performance due to thermal stress, and reduces the risk of failure of the explosion-proof valve.

[0047] In one embodiment, an explosion-proof valve and a terminal post are arranged on the cover plate 2, and 0.25 ≤ h / H ≤ 0.5 applies. If both a terminal post and an explosion-proof valve are arranged on the cover plate 2, the minimum value of h must be increased to a higher value than the minimum value h when only a terminal post or an explosion-proof valve is arranged, in order to reduce the effect of welding heat on both the terminal post and the explosion-proof valve, thus ensuring both a reliable connection of the terminal to other components and normal operation of the explosion-proof valve in emergencies.

[0048] In one embodiment, the ratio of the sum of the height h1 of the welding area 204 and h to the height h2 of the housing body is 0.002 to 0.05. The height h1 of the welding area 204 refers to the distance from the side facing away from the receiving space to the side facing the receiving space, i.e., the vertical dimension of the welding area 204. Fig. 4, and the height of the housing body 1 refers to the distance from the upper end to the lower end of the housing body 1, i.e., the vertical dimension of the housing body 1 in Fig. 3.

[0049] To ensure weld strength between the cover plate 2 and the housing body 1, the weld area 204 must be limited. To ensure weld strength, the weld area 204 must not be too small; to improve the strength between the cover plate 2 and the housing body 1, h must not be too small; and considering that the cover plate 201 extends into the housing body 1, the overall length of the weld area height and h must not be too large, as an excessive length would reduce the interior space of the housing body 1 and affect battery performance.

[0050] Therefore, the ratio of the sum of the height h1 of the welding area 204 and h to the height h2 of the housing body 1, if it is in the range of 0.002 to 0.05, not only ensures the weld strength between the cover plate 2 and the housing body 1, making their welding stronger and more reliable and preventing the cover plate 2 from detaching from the housing body 1 during thermal runaway and reducing safety risks, but also minimizes the impairment of the battery cell's performance.

[0051] In particular, the ratio of the sum of the height h1 of the welding area 204 and h to the height h2 of the housing body 1 may preferably be 0.004, 0.006, 0.008, 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04 or 0.045.

[0052] Furthermore, the height h2 of the housing body 1 is in the range of 80 mm to 250 mm. The height h2 of the housing body 1 must be neither too large nor too small. If the height h2 of the housing body 1 is too large, the increased overall weight due to the tall housing body 1 can negatively impact the user experience with portable devices and may render them unsuitable for applications with strict size requirements. If the height h2 of the housing body 1 is too small, the small housing body 1 will have a limited charging capacity of the electrode material, which restricts the maximum battery power, and the small housing body may result in an excessively compact interior, which affects heat dissipation and thus the performance and lifespan of the battery.A housing that is too small can weaken the mechanical strength, make the battery more susceptible to external physical damage, and limit the flexibility of the internal design, making it difficult to optimize the internal battery structure for optimal performance.

[0053] Therefore, with a housing body height 1 in the range of 80 mm to 250 mm, the housing weight can be controlled, suitability for applications with strict size requirements can be achieved, battery performance and mechanical strength can be ensured, and the internal battery structure can be optimized.

[0054] In particular, the height of the housing body 1 may preferably be 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 145 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 180 mm, 200 mm, 220 mm or 240 mm.

[0055] In one embodiment, the welding area 204 is located on the surface of the housing body 1 between the folded edge 202 and the housing body 1. The folded edge 202 is attached to the housing body 1 by through-welding, with the weld being performed from the surface of the housing body 1 through the folded edge 202. Through-welding offers advantages such as a high-strength connection, good sealing performance, wide range of applications, and high weld quality.

[0056] Furthermore, the weld area 204 does not penetrate the folded edge 202. This partial penetration of the weld area 204 reduces tiny holes or cracks caused by through-welding, thereby improving the battery's sealing performance, preventing electrolyte leakage or the ingress of external contaminants, and reducing the risk of leakage. Partial penetration welding maintains the integrity of the material, avoids material weakening that could occur with through-welding, and thus maintains the structural strength between the casing 1 and the cover plate 2. It can also reduce stress concentration, thereby improving the fatigue resistance of the weld area 204.

[0057] It should be noted that welding area 204 is the one in Fig. The grey area shown in section 4 is being discussed.

[0058] It is understood that in another embodiment the folded edge 202 and the housing body 1 can also be welded using butt welding methods.

[0059] As in Fig. As shown in Figure 4, the ratio of the maximum depth D of the weld area 204 on the folded edge 202 to the total thickness T of the folded edge 202 and the housing body 1 is 0.2 to 0.9 in one embodiment. The depth of the weld area 204 on the folded edge 202 refers to the fusion depth within the folded edge in its thickness direction during welding and is also simply called the fusion depth.

[0060] Furthermore, if, when welding the cover plate body to the housing body 1, the ratio of the maximum depth of the weld area 204 on the folded edge 202 to the total thickness of the folded edge 202 and the housing body 1 is too large, this indicates that the weld area 204 extends too deep into the folded edge 202, which greatly weakens the strength of the weld area 204, easily causing a local stress concentration and damaging the structural integrity of the weld area 204. If the ratio of the maximum depth of the weld area 204 on the folded edge 202 to the total thickness of the folded edge 202 and the housing body 1 is too small, this indicates that the weld area 204 does not extend deep enough into the folded edge 202, resulting in insufficient strength of the weld area 204 and affecting the overall structural stability and safety.

[0061] If the ratio of the maximum depth D of the weld area 204 on the folded edge 202 to the total thickness T of the folded edge 202 and the housing body 1 is in the range of 0.2 to 0.9, which means that the depth to which the weld area 204 extends into the folded edge 202 is in the appropriate range, this ensures the strength of the weld area 204 and improves the structural integrity and overall safety.

[0062] Furthermore, if the ratio of the maximum depth D of the weld area 204 on the folded edge 202 to the total thickness T2 of the housing body 1 and the thickness of the folded edge 202 is within a certain range, h+h1 is preferably 1.2 mm to 2.0 mm.

[0063] It should be noted that the vertical direction of the housing body 1 refers to the direction running from top to bottom in Fig.3 refers, and the depth direction of the weld area 204 runs in the thickness direction of the folded edge 202.

[0064] It should be noted that the thickness of the folded edge 202 can be equal to, less than or equal to the thickness of the cover plate body 201, and that the thicknesses of the folded edge 202 and the cover plate body 201 must be adjusted according to the specific circumstances.

[0065] In one embodiment, the material of the battery housing is stainless steel, i.e., both the cover plate 2 and the housing body 1 are made of stainless steel, resulting in advantages such as good corrosion resistance, high strength, excellent thermal expansion and heat retention properties, good penetration resistance, good safety and good weldability.

[0066] It is understood that in another embodiment the battery casing material can also be made of other materials and is not limited here.

[0067] In one embodiment, the cover plate body 201 and the folded edge 202 are formed by bending a piece of sheet material, and the cover plate 2 is machined from sheet material, thus simplifying processing and reducing manufacturing costs. If the thickness of the sheet material is uniform, the thickness of the folded edge 202 formed by bending the edge of the sheet material is equal to the thickness of the cover plate body 201. If the thickness of the sheet material changes gradually, the thickness of the folded edge 202 differs from that of the cover plate body 201.

[0068] It is understood that in another embodiment the cover plate body 201 and the folded edge 202 can also be formed separately and attached to each other.

[0069] In one embodiment, the folded edge 202 is arranged around the circumference of the cover plate body 201 and the folded edge 202 has a tight fit with the inner wall of the housing body 1, thereby enabling welding between the housing body 1 and the cover plate 2 and improving welding efficiency.

[0070] According to one embodiment of the present invention, in another aspect, a battery is also provided which has the above-mentioned battery housing and a battery cell which is arranged in the receiving space of the battery housing.

[0071] Furthermore, the battery cell can be a wound cell or a stacked cell, the terminal post can be located on the battery housing or on the cover plate body 201, and the terminal post is connected to the flag of the battery cell via a connecting piece.

[0072] It should be noted that structures such as the battery cell and the terminal post may exhibit state-of-the-art features that are not described in detail here.

[0073] According to one embodiment of the present invention, in yet another aspect, a battery pack is also provided which includes the aforementioned battery.

[0074] Furthermore, the battery pack comprises several batteries and their associated components to form a complete energy storage unit. The design and structural composition of the battery pack typically require consideration of several factors, including safety, reliability, thermal management, and electrical connections.

[0075] In particular, the battery pack also includes a battery box, a battery management system, a thermal management system, and other components. The battery box houses the batteries. The battery management system monitors and manages battery status parameters such as voltage, current, and temperature to ensure safe and efficient operation. It can also act as a balancer to prevent individual batteries from being overcharged or over-discharged. The thermal management system maintains the battery pack within an optimal operating temperature range, typically through cooling or heating systems, thus improving battery life and safety.

[0076] Even though the embodiments of the present invention have been described in conjunction with the drawings, the person skilled in the art can make various modifications and variations without deviating from the basic idea and scope of the present invention, and such modifications and variations fall within the scope defined by the accompanying claims.

Claims

[1] Battery casing, characterized by , that it exhibits the following: a housing body (1) having an opening, a cover plate (2) that seals the opening to form a receiving space, wherein the cover plate (2) has a cover plate body (201) and a folded edge (202) arranged at an edge of the cover plate body (201), the folded edge (202) extending in a direction away from the receiving space, the folded edge (202) being welded to the housing body (1), a weld area (204) being formed at a position where the folded edge (202) and the housing body (1) are welded in the direction of extension of the folded edge (202), the cover plate body (201) being arranged on a side of the weld area (204) close to the receiving space in a direction perpendicular to an upper surface of the cover plate body (201),a distance from a side of the weld area (204) located near the receiving space to the upper surface of the cover plate body (201) is defined as h, and a distance from a side of the folded edge (202) facing away from the receiving space to a side of the cover plate body (201) located near the receiving space is defined as H, where 0.17 ≤ h / H ≤ 0.

5. [2] Battery housing according to claim 1, characterized by , that h is between 0.1 mm and 1 mm. [3] Battery housing according to claim 1 or 2, characterized by , that h is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm or 0.9 mm. [4] Battery housing according to any one of the preceding claims, characterized by , that the ratio of the thickness T1 of the folded edge (202) to the thickness T2 of the housing body (1) is 1.2:1 to 3:

1. [5] Battery housing according to claim 4, characterized by, that the ratio of the thickness T1 of the folded edge (202) to the thickness T2 of the housing body (1) is 1.5:1, 1.8:1, 2:1, 2.2:1 or 2.5:

1. [6] Battery housing according to any one of the preceding claims, characterized by , that the thickness of the housing body (1) at the opening is 0.1 mm to 0.5 mm. [7] Battery housing according to claim 6, characterized by , that the thickness of the housing body (1) at the opening is 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.48 mm. [8] Battery housing according to any one of the preceding claims, characterized by , that the thickness of the folded edge (202) is 0.2 mm to 0.9 mm. [9] Battery housing according to claim 8, characterized by , that the thickness of the folded edge (202) is 0.3 mm, 0.4 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm or 0.8 mm. [10] Battery housing according to any one of the preceding claims, characterized by, that an upper end of the opening of the housing body (1) is not higher than an upper end of the folded edge (202). [11] Battery housing according to claim 10, characterized by , that the upper end of the opening of the housing body (1) is lower than the upper end of the folded edge (202). [12] Battery housing according to claim 11, characterized by , that 0.17 ≤ h / H ≤ 0.

35. [13] Battery housing according to claim 2, characterized by , that the cover plate body (201) is connected to the folded edge (202) via an arc-shaped transition section (203), wherein the arc radius R of the arc-shaped transition section (203) and h satisfy the following relation: 0.5 mm ≤ R+h ≤ 1 mm. [14] Battery housing according to claim 13, characterized by , that the R+h is 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm or 0.9 mm. [15] Battery housing according to claim 13, characterized by that the arc radius R is between 0.2 mm and 0.8 mm. [16] Battery housing according to claim 15, characterized by , that the arc radius R is 0.3 mm, 0.4 mm, 0.55 mm, 0.5 mm, 0.6 mm, 0.65 mm, 0.7 mm or 0.75 mm. [17] Battery housing according to claim 13, characterized by , that the thickness of the arc-shaped transition section (203) is 90% to 99% of the thickness of the folded edge (202). [18] Battery housing according to claim 17, characterized by , that the thickness of the arc-shaped transition section (203) is 0.35 mm to 0.55 mm. [19] Battery housing according to claim 18, characterized by , that the thickness of the arc-shaped transition section (203) is 0.4 mm, 0.45 mm, 0.45 mm or 0.5 mm. [20] Battery housing according to claim 13, characterized by , that the welding area (204) between the housing body (1) and the folded edge (202) is spaced apart from the arc-shaped transition section (203). [21] Battery housing according to any one of the preceding claims, characterized by, that a terminal post is arranged on the cover plate (2) and 0.20 ≤ h / H ≤ 0.5 applies. [22] Battery housing according to any one of the preceding claims, characterized by , that an explosion-proof valve is arranged on the cover plate (2) and 0.23 ≤ h / H ≤ 0.5 applies. [23] Battery housing according to any one of the preceding claims, characterized by , that an explosion-proof valve and a terminal post are arranged on the cover plate (2) and 0.25 ≤ h / H ≤ 0.5 applies. [24] Battery housing according to any one of the preceding claims, characterized by , that the ratio of the sum of the height h1 of the welding area (204) and h to the height h2 of the housing body (1) is 0.002 to 0.

05. [25] Battery housing according to claim 24, characterized by , that the ratio of the sum of the height h1 of the welding area (204) and h to the height h2 of the housing body (1) is 0.004, 0.006, 0.008, 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04 or 0.

045. [26] Battery housing according to claim 24 or 25, characterized by , that the height h2 of the housing body (1) is 80 mm to 250 mm. [27] Battery housing according to claim 26, characterized by , that the height h2 of the housing body (1) is 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 145 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 180 mm, 200 mm, 220 mm or 240 mm. [28] Battery housing according to any one of the preceding claims, characterized by , that the welding area (204) is located between the folded edge (202) and the housing body (1) on a surface of the housing body (1). [29] Battery, characterized by that it comprises the battery housing according to one of the preceding claims and a battery cell arranged in the receiving space of the battery housing.

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