Battery housing, battery with housing and power-consuming device

Abstract

Battery housing, wherein a material of the housing (1) comprises steel, characterized in that the steel has a component of Ti, Nb and Cr, wherein, based on a total mass of the steel, the percentage mass content of Cr is ≥ 16 wt.%; wherein the housing (1) comprises a side wall (13) and an end wall (11) which is formed in one piece with the side wall (13); where the housing (1) satisfies the following relational equation: 50 ≤ (h / d) / (b + c) ≤ 7000; where h is a height of the housing (1) with a unit of mm; where d is a thickness of the end wall (11) with a unit of mm; where b is the percentage mass content of Ti with a unit of wt.% based on the total mass of the steel; where c is the percentage mass content of Nb with a unit of wt.% based on the total mass of the steel;

Description

Technical field

[0001] The present invention relates to the technical field of batteries, in particular a battery housing, a battery with the housing and a power-consuming device. Technical background

[0002] With the continued popularity of new energy vehicles, the power battery, as a core component of a new energy vehicle, directly determines the vehicle's range, performance, and overall safety. The battery casing is a crucial part of the power battery, influencing its safety, energy density, lifespan, and other performance characteristics; therefore, the battery casing must be lightweight while exhibiting excellent mechanical properties.

[0003] Deep drawing is the use of stamping, ring drawing, or metal forming processes to deform sheet metal into a cylindrical or box-shaped part. Deep drawing processes are characterized by high productivity, high material utilization, a certain degree of dimensional accuracy, and low surface roughness, whereas other processing methods are not as suitable for producing thin-walled and complex parts. Given the increasingly fierce price competition, deep drawing processes, which require excellent tensile strength in the housing material, are predominantly used in current battery housings to reduce raw material and processing costs.

[0004] Currently, stainless steel is frequently used for products requiring deep drawing because it has high ductility, is suitable for forming complex shapes with fewer defects, and also possesses excellent work hardening properties. However, when stainless steel is deep drawn, its strength increases further due to work hardening, and the stress becomes locally concentrated, leading to fractures. Content of the invention

[0005] One purpose of the present invention is to overcome the inadequacy in the prior art of using steel as the material for the battery housing for deep drawing, which is prone to breakage phenomena, and to provide a battery housing, a battery with the housing, and a power-consuming device therefor.

[0006] To achieve the above purpose, according to a first aspect of the present invention, the present invention provides a battery housing, wherein a material of the housing comprises steel, characterized in that the steel has a component of Ti, Nb and Cr, wherein, based on a total mass of the steel, the percentage mass content of Cr is ≥ 16 wt.%;

[0007] The housing includes an end wall;

[0008] The casing satisfies the following relational equation: 50 ≤ (h / d) / (b + c) ≤ 7000; h is the height of the housing, with a unit of mm; d is the thickness of the end wall with a unit of mm; b is the percentage mass content of Ti with a unit of wt.% based on the total mass of the steel; c is the percentage mass content of Nb with a unit of wt.% based on the total mass of the steel;

[0009] In a preferred embodiment of the present invention, the housing satisfies the following relational equation: 142 ≤ (h / d) / (b + c) ≤ 2000.

[0010] In a preferred embodiment of the present invention, h lies in a range of 20-300 mm.

[0011] In a preferred embodiment of the present invention, h lies in a range of 50-270mm.

[0012] In a preferred embodiment of the present invention, d lies in a range of 0.2-1.5 mm.

[0013] In a preferred embodiment of the present invention, d lies in a range of 0.5-1.0 mm.

[0014] In a preferred embodiment of the present invention, b+c lies in a range of 0.2-0.8 wt.%.

[0015] In a preferred embodiment of the present invention, b+c lies in a range of 0.25-0.5 wt.%.

[0016] In a preferred embodiment of the present invention, b lies in a range of 0.05-0.2 wt.%.

[0017] In a preferred embodiment of the present invention, c lies in a range of 0.17-0.5 wt.%.

[0018] In a preferred embodiment of the present invention, the housing further comprises a side wall, wherein the housing further satisfies the following relational equation: 0.5 ≤ (f / d) / (b + c) ≤ 5, where f is the thickness of the side wall of the housing with a unit of mm.

[0019] In a preferred embodiment of the present invention, f lies in a range of 0.1-1.2 mm.

[0020] In a preferred embodiment of the present invention, d lies in a range of 0.3-1.2 mm.

[0021] In a preferred embodiment of the present invention, a pressure relief structure is arranged on the end wall of the housing.

[0022] In a preferred embodiment of the present invention, the pressure relief structure comprises a weak section, wherein the housing further satisfies the following relational equation: 0.004 ≤ m × (b + c) ≤ 0.12, where m is a residual thickness of the weak section with a unit of mm.

[0023] In a preferred embodiment of the present invention, m lies in a range of 0.01-0.5 mm.

[0024] In a preferred embodiment of the present invention, the housing is provided with an end cap at one end opposite the end wall, wherein the end cap is firmly connected to the side wall, and wherein the end wall or the end cap is provided with a through-hole for arranging a pole assembly.

[0025] In a preferred embodiment of the present invention, where the through-hole is arranged on the end wall, the housing further satisfies the following relationship: 0.005 ≤ k / (b + c) ≤ 0.5, where k is a ratio of the area of ​​the through-hole to the area of ​​the end wall on which the through-hole is located.

[0026] In a preferred embodiment of the present invention, k lies in a range of 0.00125-0.1.

[0027] In a preferred embodiment, a liquid injection hole is provided on the end wall, and the housing further satisfies the following relational equation: 0.004 ≤ z / (b + c) ≤ 0.3, where z is the ratio of the area of ​​the liquid injection hole to the area of ​​the end wall.

[0028] In a preferred embodiment of the present invention, z lies in a range of 0.001-0.08.

[0029] In a preferred embodiment of the present invention, the steel further comprises a component of C, Si, Mn, P, S and Fe.

[0030] According to a second aspect of the present invention, the present invention provides a battery comprising a battery housing as described above.

[0031] According to a third aspect of the present invention, the present invention provides a power-consuming device comprising a battery as described above.

[0032] The present invention has the following advantageous effects:

[0033] By controlling the ratio between the Ti and Nb content and the height and thickness of the end wall of the housing, the present invention enables the steel with this Ti and Nb content to achieve a deep-drawing processing performance of the battery housing and the formed housing to have better mechanical properties, such as pressure resistance. Images Fig. Figure 1 shows a schematic representation of the overall structure of a battery in embodiment 1; Fig. Figure 2 shows a schematic representation of the overall structure of a battery in embodiment 1 from a different view; Fig. Figure 3 shows a schematic representation of the structure of a housing in embodiment 33; Fig. Figure 4 shows a partially enlarged representation of the A-area in Fig. 3. Fig.Figure 5 shows a schematic representation of the structure of a housing in embodiment 38; Fig. Figure 6 shows a schematic representation of the overall structure of a battery in embodiment 45. Reference symbol list:

[0034] 1-Housing, 11-End wall, 12-End cap, 13-Side wall, 2-Weak section, 3-Through hole, 4-Liquid injection hole, 5-Pole assembly. Description of embodiments

[0035] The technical solution in the embodiments of the present invention is explained clearly and completely below, so that the purpose, the technical solutions, and the advantages of the embodiments of the present invention become clearer. Obviously, the described embodiments do not represent all embodiments, but only a subset of the embodiments of the present invention. All other embodiments that a person skilled in the art in this field could obtain from the embodiments in the present invention without any creative work should be considered to be covered by the scope of protection of the present invention.

[0036] The present invention includes, among the technical features described in an open manner, a closed technical solution with the listed features, and also an open technical solution with the listed features.

[0037] Within the scope of the present invention, a numerical interval is considered continuous within said numerical interval unless otherwise specified, and includes a minimum and a maximum value of the range, as well as each value between these minimum and maximum values. If the range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. If several ranges are specified to describe a feature or property, the ranges may also be combined. In other words, unless otherwise specified, all ranges disclosed herein are to be understood as encompassing all subranges contained therein.

[0038] One embodiment of the present invention provides a battery housing, wherein a material of the housing 1 comprises steel, wherein the steel has a component of Ti, Nb and Cr, wherein, based on a total mass of the steel, the percentage mass content of Cr is ≥ 16 wt.%;

[0039] The housing 1 includes an end wall 11;

[0040] Housing 1 satisfies the following relational equation: 50 ≤ (h / d) / (b + c) ≤ 7000; h is the height of the housing 1 with a unit of mm; d is a thickness of the end wall 11 with a unit of mm; b is the percentage mass content of Ti with a unit of wt.% based on the total mass of the steel; c is the percentage mass content of Nb with a unit of wt.% based on the total mass of the steel;

[0041] The shape of the battery housing 1 is usually cylindrical, including cylindrical and prismatic shapes. The battery housing 1 provided by the present invention is manufactured by a deep-drawing process. An open area is required for the punch to enter during the deep-drawing process. This open area is generally one of the bottom surfaces of the cylindrical battery, while the other bottom surface is formed integrally with the side wall 13. In the present invention, the end wall 11 is defined as a surface formed integrally with the side wall 13, and the open area is provided with an end cap 12. The end cap 12 is firmly connected to the side wall 13, which may be welded, riveted, glued, etc., without affecting the implementation of the present solution.

[0042] Cr is the main element that determines the corrosion resistance of stainless steel and increases the potential of the substrate electrodes, thereby significantly improving the steel's corrosion resistance. Furthermore, as the main component of the oxide layer, Cr contributes to the formation of a more stable oxide layer and improves oxidation resistance at high temperatures.

[0043] During the deep-drawing process, when the end wall 11 is formed and then the side wall 13 is drawn, the end wall 11 serves as a reference for drawing at this stage, and the thickness d of the end wall remains essentially unchanged, while the initial thickness of the side wall 13 is the same as the thickness d of the end wall, against which it decreases as it is drawn. Therefore, as the height h of the housing 1 increases, the required deep-drawing properties of the housing 1 must be increased accordingly; in particular, if the thickness d of the end wall of the housing 1 is smaller, but the height h of the housing 1 is larger, i.e.,If the initial thickness of the side wall 13 is smaller, but the side wall 13 is drawn more, then this results in a thinner side wall 13 being formed during the drawing process and a higher strength requirement is placed so that no crushing occurs in the housing 1 during the drawing process, and a better deep-drawing property is required for the housing 1 to avoid hardening of the housing 1 during the deep-drawing process, which leads to a break due to a local force concentration.

[0044] In the present invention, by controlling the titanium (Ti) and niobium (Nb) content, it is possible to regulate the deep-drawing properties of the steel to a certain extent in order to avoid the occurrence of fractures due to stress concentrations during deep drawing and forming, which leads to a higher defect rate. In particular, if the end wall 11 is thin and the draw height is high, i.e., the height of the housing 1 is high, it is necessary for the steel to have better deep-drawing properties to prevent the housing 1 from breaking during the deep-drawing process.

[0045] However, improved deep-drawing properties of the steel mean that the steel is prone to deformation, which can result in the housing 1 being less resilient after casting, thus compromising battery safety. If the deep-drawing properties are poor, the mechanical properties of the formed housing 1 will be inadequate even with minimal forming, making safety performance difficult to guarantee. Therefore, it is necessary to balance the deep-drawing properties of the housing 1 during processing with its compressive strength after processing and casting.

[0046] If the value of (h / d) / (b + c) is too small, this means that h / d is too small or the content of at least one of Ti and Nb is too high. If h / d is too small, the drawing degree is insufficient, and if the content of Ti is too high, this can lead to changes in the recrystallization behavior of the stainless steel, which in turn affects the mechanical properties and corrosion resistance of the stainless steel, which in turn leads to a reduction in the forming rate of the housing 1, and an excessively high content of Nb will lead to a reduction in the elongation as well as the deep-drawing properties of the material;If the value of (h / d) / (b + c) is too large, this means that h / d is too high, or the content of at least one of Ti and Nb is too low; and the larger h / d is, the greater the drawing degree required, but if the content of Ti and Nb is too low, intergranular corrosion during deep drawing will increase, and the formability of the housing will be worse, so (h / d) / (b + c) must be controlled within a suitable range.

[0047] Therefore, in the present invention, the percentage mass content b of Ti, the percentage mass content c of Nb, the thickness d of the end wall 11, and the height h of the housing 1 are adjusted such that 50 ≤ (h / d) / (b + c) ≤ 7000 is satisfied, so that the deep-drawing property of the steel corresponds to the size of the housing 1 to be processed, thereby avoiding breakage during the deep-drawing process and improving the processing yield, and the formed housing 1 has better mechanical properties to ensure the safety of the battery.

[0048] In some embodiments of the present invention, (h / d) / (b + c ) is in particular optionally 50, 60, 70, 80, 90, 100, 110, 120, 135, 150, 200, 300, 500, 800, 1000, 2000, 3000, 4000, 5000, 6000, 6500, 6800, 6900, 6950, 7000 or any value in a range between any two of these values, e.g. a range of 100-6000, 135-5000, 1000-7000.

[0049] In one embodiment, the housing 1 satisfies the following relational equation: 142 ≤ (h / d) / (b + c) ≤ 2000.

[0050] In the present solution, a housing 1 that satisfies the above relational equation achieves a higher processing yield in the deep drawing process.

[0051] In one embodiment, h lies in a range of 20-300 mm.

[0052] In some embodiments of the present invention, h is in particular optionally 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 100 mm, 120 mm, 150 mm, 180 mm, 200 mm, 220 mm, 250 mm, 270 mm, 280 mm, 290 mm, 295 mm, 300 mm or any value in a range between two of these values, e.g. a range of 50-270 mm, 100-220 mm, 80-300 mm.

[0053] In one embodiment, h lies in a range of 50-270 mm.

[0054] In one embodiment, d lies in a range of 0.2-1.5 mm.

[0055] In some embodiments of the present invention, d is in particular optionally 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.45 mm, 1.5 mm or any value in a range between two of these values, e.g. a range of 0.4-1.0 mm, 0.5-1.2 mm, 0.2-0.8 mm.

[0056] In one embodiment, d lies in a range of 0.5-1.0 mm.

[0057] In one embodiment, b+c lies in a range of 0.2-0.8 wt.%.

[0058] In some embodiments of the present invention, b+c is in particular optionally 0.2 wt.%, 0.25 wt.%, 0.3 wt.%, 0.35 wt.%, 0.4 wt.%, 0.45 wt.%, 0.5 wt.%, 0.55 wt.%, 0.6 wt.%, 0.65 wt.%, 0.7 wt.%, 0.75 wt.%, 0.8 wt.% or any value in a range between two of these values, e.g. a range of 0.2-0.5 wt.%, 0.3-0.8 wt.%, 0.25-0.5 wt.%.

[0059] In one embodiment, b+c lies in a range of 0.25-0.5 wt.%.

[0060] Titanium dioxide (Ti) and nitrogen (Nb) are carbon and nitrogen stabilizing elements that can combine with carbon and nitrogen to form NbC, NbN, TiC, and TiN, respectively, thereby improving the strength of steel. Simultaneously, carbide can precipitate and subsequently form Ti, significantly improving the plasticity and impact toughness of the steel, ensuring good deep-drawing properties. Furthermore, it inhibits the formation of chromium, carbon, and nitrogen oxides in the steel, thus improving the intergranular corrosion resistance of stainless steel. While trace amounts of Nb can improve the strength of steel without affecting its plasticity or toughness, the carbides and oxides of Nb can enhance the impact toughness of steel and lower its brittle transition temperature due to the grain refinement effect.

[0061] In one embodiment, b lies in a range of 0.05-0.2 wt.%.

[0062] Too much Nb leads to the formation of a coarse Fe2Nb hard phase, which reduces the elongation and deep-drawing properties of the material, and too much NbN also reduces the thermoplasticity of the steel, so the amount of Nb is kept within a certain range.

[0063] In some embodiments of the present invention, b+c is in particular optionally 0.05 wt.%, 0.07 wt.%, 0.1 wt.%, 0.12 wt.%, 0.15 wt.%, 0.17 wt.%, 0.2 wt.% or any value in a range between any two of these values, e.g. a range of 0.05-0.15 wt.%, 0.07-0.17 wt.%, 0.1-0.2 wt.%.

[0064] In one embodiment, c lies in a range of 0.17-0.5 wt.%.

[0065] The high number and size of TiN inclusions at higher Ti content impairs the surface quality of the steel, which is why it is necessary to keep the Ti content within a certain range.

[0066] In some embodiments of the present invention, c is in particular optionally 0.17 wt.%, 0.2 wt.%, 0.22 wt.%, 0.25 wt.%, 0.27 wt.%, 0.3 wt.%, 0.35 wt.%, 0.4 wt.%, 0.45 wt.%, 0.5 wt.% or any value in a range between any two of these values, e.g. a range of 0.25-0.5 wt.%, 0.17-0.35 wt.%, 0.2-0.4 wt.%.

[0067] The test procedure for the Ti, Nb, and Cr content is not restricted, and a person skilled in the art can test the Ti, Nb, and Cr content using conventional methods. For example, inductively coupled plasma methods, X-ray fluorescence spectrometry, and the like. Inductively coupled plasma process (1) Sample preparation: Stainless steel samples must be properly pretreated, e.g., dissolved in a special acid solution to release the element to be tested. For example, aqua regia may be used to dissolve the sample or a special mixed acid system may be used for digestion to ensure the effective release of the elements. (2) Analytical methods: The most important analytical methods for ICP-OES include the standard curve method and the internal standard method. The standard curve method represents the relationship between the concentration of the standard solution and the emission intensity at the corresponding wavelength and compares the emission intensity of the sample solution with the standard curve to determine the concentration of each element in the sample. In the internal standard method, an element with similar chemical properties to the element being tested and a constant concentration in the sample is selected as the internal standard, and the influence of the sample composition and the experimental conditions is eliminated by comparing the ratio of the emission intensity of the element being tested with that of the internal standard. X-ray fluorescence spectrometry (1) Sample preparation: First, the stainless steel sample must be properly treated to facilitate the penetration of X-rays and fluorescence excitation. This may include cutting, grinding, polishing, and other steps to ensure that the sample surface is flat and free from contaminants. (2) X-ray excitation: The surface of the sample is irradiated with high-energy X-rays to excite the characteristic X-ray fluorescence of the individual elements. The wavelength or energy characteristic of these fluorescence spectra corresponds to the element, so that it is possible to determine which elements are contained in the sample. (3) Spectral collection and analysis: The X-rays reflected from the sample surface and the emitted fluorescence spectra are collected by a spectrometer. The type and content of the elements can be determined from the positions and intensities of the characteristic spectral lines. (4) Matrix effect correction: Due to the interaction between different elements in stainless steel (matrix effect), the acquired spectral data must be corrected to eliminate the influence of this interaction on the analysis results and to improve the accuracy of the analysis. (5) Interpretation of the results: Based on the corrected data, the content of the individual elements in the stainless steel can be calculated so that its properties and quality can be assessed.

[0068] In a preferred embodiment of the present invention, the housing 1 further comprises a side wall 13, wherein the housing 1 further satisfies the following relational equation: 0.5 ≤ (f / d) / (b + c) ≤ 5, where f is the thickness of the side wall 13 of the housing 1 with a unit of mm.

[0069] Since the end wall 11 and the side wall 13 are formed in one piece by deep drawing, the requirements for the deep-drawing properties of the steel are higher the greater the height of the housing 1, i.e., the greater the tensile strength of the side wall 13. In particular, the thickness change of the end wall 11 during the deep-drawing process must be less than the thickness change of the side wall 13; that is, the thickness of the side wall 13 must not exceed the thickness of the end wall 11 within the same housing 1. If the thickness of the end wall 11 is greater but the thickness of the side wall 13 is smaller, this means that the tensile strength of the material in the area of ​​the side wall 13 is higher, which makes the one-piece forming of the housing more difficult.

[0070] In some embodiments of the present invention, (f / d) / (b + c ) is in particular optionally 0.5, 0.6, 0.8, 1, 2, 3, 4, 4.5, 5 or any value in a range between any two of these values, e.g. a range of 0.5-2, 0.5-4.5, 1-5.

[0071] In one embodiment, f lies in a range of 0.1-1.2 mm.

[0072] In some embodiments of the present invention, f is in particular optionally 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.15 mm, 1.2 mm or any value in a range between any two of these values, e.g. a range of 0.2-0.8 mm, 0.5-1.0 mm, 0.2-0.5 mm.

[0073] In one embodiment, d lies in a range of 0.3-1.2 mm.

[0074] In some embodiments of the present invention, d is in particular optionally 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm or any value in a range between any two of these values, e.g. a range of 0.3-1.0 mm, 0.5-1.0 mm, 0.4-0.8 mm.

[0075] In one embodiment, a pressure relief structure is arranged on the end wall 11 of the housing 1.

[0076] The pressure relief structure on the battery cell plays a crucial role in its safety. For example, if a short circuit or overcharging occurs, this can lead to thermal runaway and a sudden increase in pressure or temperature within the battery cell. In this case, the pressure relief structure can dissipate the internal pressure and temperature to the outside, preventing the battery cell from exploding and catching fire. The specific shape of the pressure relief structure is not limited, but it is primarily used for timely pressure relief when thermal runaway occurs. Its structure can be a separate explosion-proof plate, where a hole is formed in the housing 1 and the explosion-proof plate is connected to the hole, or it can be directly stamped onto the housing 1 or formed by etching.

[0077] In one embodiment, the pressure relief structure comprises a weak section 2, wherein the housing 1 further satisfies the following relational equation: 0.004 ≤ m × (b + c) ≤ 0.12, where m is a residual thickness of the weak section 2 with a unit of mm.

[0078] When the pressure relief structure releases pressure upon reaching a preset pressure, the weak section 2 on the explosion protection plate ruptures to achieve pressure relief, thus ensuring battery safety. The weak section 2 can be a thinning section formed by stamping or laser etching on the explosion protection plate. The remaining thickness of the thinning section is the remaining thickness of the explosion protection plate after thinning by stamping or laser etching, etc. The direction of the remaining thickness of the thinning section is parallel to the thickness direction of the end wall 11, and the remaining thickness of the thinning section is less than the thickness of the end wall 11. The shape of the weak section 2 can be modeled on the shape of the explosion protection plate.A ring is punched along the edge of the explosion protection plate, and the resulting annular thinning section is used as the thinning section. The weak section 2 formed in this way has a large area and is more prone to bursting; the thinning section can also be an incomplete circle, but at least one non-thinning area must remain in the annular thinning section so that, after pressure relief, the explosion protection plate still has a connection to prevent the entire explosion protection plate from being blown out and causing safety hazards.

[0079] In the present solution, the pressure relief structure is formed directly onto the housing 1 in one piece by stamping or laser etching. Since the pressure relief structure and the housing 1 are formed as a single piece, the dimensions of the pressure relief structure must be adapted to the deep-drawing properties of the housing 1 to ensure the processing and forming rate, the strength of the housing 1, and the release pressure of the pressure relief structure. The bursting pressure of the pressure relief structure depends on the strength of the material and the hardness of the weak section 2. To prevent unintentional release of the pressure relief structure, the residual thickness of the weak section 2 must be controlled.Since the Ti and Nb content is controlled within a specific range, the steel's strength is increased, allowing the size of m to be appropriately reduced. This results in a thinner weak section 2, enabling the pressure relief structure in the battery to rupture in the event of thermal runaway, thus protecting the battery's safety. If m × (b + c) is too small, the Ti and Nb content is too low, leading to poor formability, and the remaining thickness m of weak section 2 is too small, making the pressure relief structure less robust and prone to accidental rupture. Conversely, if m × (b + c) is too large, the Ti and Nb content is too high, resulting in a lower formability rate, and the remaining thickness of weak section 2 is too large, which is detrimental to the battery's thermal runaway when the pressure relief structure ruptures to release heat.Therefore, m × (b + c) must be controlled within a suitable range.

[0080] If the end wall 11, the side wall 13, the weak section 2 and the through hole 3 on the end wall 11 are formed and processed in one piece in the housing 1, the processing performance in the deep drawing process, the strength of the housing 1 after forming and the bursting pressure of the pressure relief structure must be taken into account;In the present invention, the Ti and Nb content is further controlled by limiting the ratio between the residual thickness m of the weak section 2 and the Ti and Nb content, as well as the ratio z between the area of ​​the liquid injection hole 4 and the area of ​​the end wall 11 and the Ti and Nb content, provided that the deep-drawing requirements for the height of the housing 1 and the thickness of the end wall are met, so that when the end wall 11 is deep-drawn for the weak section 2 and the through-hole 3, the properties of the steel can meet the requirements of the deep-drawing process and the formed housing 1 has sufficient strength.

[0081] In some embodiments of the present invention, m × (b + c ) is in particular optionally 0.004, 0.005, 0.006, 0.008, 0.01, 0.02, 0.04, 0.05, 0.08, 0.1, 0.11, 0.115, 0.12 or any value in a range between any two of these values, e.g. a range of 0.004-0.08, 0.005-0.05, 0.01-0.12.

[0082] In one embodiment, m lies in a range of 0.01-0.5 mm.

[0083] In some embodiments of the present invention, m is in particular optionally 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.20 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm or any value in a range between two of these values, e.g. a range of 0.1-0.5 mm, 0.01-0.1 mm, 0.2-0.4 mm.

[0084] In one embodiment, the housing 1 is provided with an end cap 12 at one end opposite the end wall 11, wherein the end cap 12 is firmly connected to the side wall 13, and wherein the end wall 11 or the end cap 12 is provided with a through-hole for arranging a pole assembly 5.

[0085] In one embodiment, the through-hole 3 is arranged on the end wall 11, and the housing 1 further satisfies the following relationship: 0.005 ≤ k / (b + c) ≤ 0.5, where k is a ratio of the area of ​​the through-hole 3 to the area of ​​the end wall 11 on which the through-hole 3 is located.

[0086] The through-hole 3 can be located on the end wall 11 of the housing 1 or on the end cap 12, and in the present solution, the through-hole 3 is located on the end wall 11. Since the end wall 11 is formed integrally with the housing 1 and the pressure relief structure is also located on the end wall 11, the ratio of the area of ​​the through-hole 3 to that of the end wall 11 must be adapted to the deep-drawing properties of the housing 1 in order to ensure the processing and forming rate as well as the strength of the housing 1. In the present solution, the pole assembly 5 is electrically connected to the inner electrical core through the through-hole 3.The cross-sectional area of ​​the pole influences the overcurrent; the overcurrent is improved by controlling the content of Ti and Nb within a certain range to make the casing 1 stronger, so that a larger through-hole 3 can be formed to accommodate a larger pole assembly 5.k / (b + c) must be within a suitable range because if k / (b + c) is too small, the small area of ​​the through-hole 3 results in a limited cross-sectional area of ​​the pole and insufficient overcurrent capacitance, and the Ti and Nb content is too high, reducing the forming rate of the housing 1. If k / (b + c) is too large, the area of ​​the through-hole 3 is relatively large while the Ti and Nb content is relatively low, the housing 1 is fragile due to the low Ti and Nb content in the end wall 11, and the excessively large area of ​​the through-hole 3 leads to weaker end wall 11 strength, further increasing the risk of housing 1 deformation. Therefore, k / (b + c) must be set within a suitable range.

[0087] In some embodiments of the present invention, k / (b + c) is in particular optionally 0.005, 0.006, 0.008, 0.01, 0.02, 0.05, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.42, 0.45, 0.47, 0.5 or any value in a range between any two of these values, e.g. a range of 0.05-0.5, 0.005-0.4, 0.1-0.5.

[0088] In one embodiment, k lies in a range of 0.00125-0.1.

[0089] In some embodiments of the present invention, k is in particular optionally 0.00125, 0.0013, 0.0014, 0.0015, 0.0017, 0.002, 0.0025, 0.003, 0.004, 0.005, 0.008, 0.01, 0.02, 0.03, 0.05, 0.07, 0.08, 0.09, 0.095, 0.1 or any value in a range between any two of these values, e.g. a range of 0.00125-0.05, 0.01-0.1, 0.0025-0.1 .

[0090] In one embodiment, a liquid injection hole 4 is provided on the end wall 11, and the housing 1 further satisfies the following relational equation: 0.004 ≤ z / ( b + c) ≤ 0.3, where z is the ratio of the area of ​​the liquid injection hole 4 to the area of ​​the end wall 11.

[0091] Since the Ti and Nb content is controlled within a specific range, the strength of the housing 1 is increased, and increasing the area of ​​the liquid injection hole 4 does not weaken the overall strength of the end wall 11. Furthermore, as the Ti and Nb content is increased, corrosion resistance is improved, and the strength of the end wall 11 is strengthened. The ratio z of the area of ​​the liquid injection hole 4 to the area of ​​the end wall 11 can be increased, thereby improving the efficiency of the liquid injection. z / (b + c) must be within a suitable range.If z / (b + c) is too small, the area of ​​the liquid injection hole 4 is too small, which impairs the efficiency of the liquid injection, and the content of Ti and Nb is too high, resulting in a low forming rate of the housing 1; if z / (b + c) is too large, the area of ​​the liquid injection hole 4 is too large, which causes the end wall 11 to deform slightly, and with a low content of Ti and Nb, the housing 1 can corrode easily.

[0092] In some embodiments of the present invention, z / (b + c) is in particular optionally 0.004, 0.0045, 0.005, 0.007, 0.01, 0.02, 0.04, 0.05, 0.06, 0.08, 0.1, 0.15, 0.2, 0.25, 0.27, 0.28, 0.29, 0.3 or any value in a range between any two of these values, e.g. a range of 0.004-0.05, 0.005-0.1, 0.01-0.03.

[0093] In one embodiment, z lies in a range of 0.001-0.08.

[0094] In some embodiments of the present invention, z is optionally 0.001, 0.00125, 0.002, 0.003, 0.0035, 0.004, 0.0045, 0.0047, 0.005, 0.006, 0.007, 0.0075, 0.008, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.075, 0.08 or any value in a range between any two of these values, e.g. a range of 0.00125-0.05, 0.001-0.05, 0.008-0.08.

[0095] The position of the through-hole 3 and the liquid injection hole 4 can be as shown in Fig. 3, wherein the through-hole 3 is located at the end cap 12 and the liquid injection hole 4 is located at the end wall 11; or the through-hole 3 can be located at the end wall 11 and the liquid injection hole 4 at the end cap 12, as shown in Fig.5 shown; or the through-hole 3 and the liquid injection hole 4 can both be located at the same end of the housing, in which case holes must be formed in the terminal assembly to serve as liquid injection holes. The through-holes 3 and the liquid injection holes 4 are located at both ends of the housing, which is more convenient for battery mounting.

[0096] In one embodiment, the steel also has a component of C, Si, Mn, P, S and Fe.

[0097] In some embodiments, the steel comprises Fe and the components in the following percentage mass fractions: C: more than 0 and less than or equal to 0.03%, Si: 0 to 0.75%, Mn: 0 to 1.0%, P: 0 to 0.04%, S: 0 to 0.03%, Cr: 16 to 30%, Ti: 0.05 to 0.2%, Nb: 0.17 to 0.5%, and 0.5% unavoidable impurities.

[0098] The test procedure for the content of the individual components:

[0099] The test procedure for the Ti, Nb, and Cr content is not restricted, and a person skilled in the art can test the Ti, Nb, and Cr content using conventional methods. For example, inductively coupled plasma methods, X-ray fluorescence spectrometry, etc., or other test procedures do not affect the execution of the present solution. Inductively coupled plasma process (1) Sample preparation: Stainless steel samples must be properly pretreated, e.g., dissolved in a special acid solution to release the element to be tested. For example, aqua regia may be used to dissolve the sample or a special mixed acid system may be used for digestion to ensure the effective release of the elements. (2) Analytical methods: The most important analytical methods for ICP-OES include the standard curve method and the internal standard method. The standard curve method represents the relationship between the concentration of the standard solution and the emission intensity at the corresponding wavelength and compares the emission intensity of the sample solution with the standard curve to determine the concentration of each element in the sample. In the internal standard method, an element with similar chemical properties to the element being tested and a constant concentration in the sample is selected as the internal standard, and the influence of the sample composition and the experimental conditions is eliminated by comparing the ratio of the emission intensity of the element being tested with that of the internal standard. X-ray fluorescence spectrometry (1) Sample preparation: First, the stainless steel sample must be properly treated to facilitate the penetration of X-rays and fluorescence excitation. This may include cutting, grinding, polishing, and other steps to ensure that the sample surface is flat and free from contaminants. (2) X-ray excitation: The surface of the sample is irradiated with high-energy X-rays to excite the characteristic X-ray fluorescence of the individual elements. The wavelength or energy characteristic of these fluorescence spectra corresponds to the element, so that it is possible to determine which elements are contained in the sample. (3) Spectral collection and analysis: The X-rays reflected from the sample surface and the emitted fluorescence spectra are collected by a spectrometer. The type and content of the elements can be determined from the positions and intensities of the characteristic spectral lines. (4) Matrix effect correction: Due to the interaction between different elements in stainless steel (matrix effect), the acquired spectral data must be corrected to eliminate the influence of this interaction on the analysis results and to improve the accuracy of the analysis. (5) Interpretation of the results: Based on the corrected data, the content of the individual elements in the stainless steel can be calculated so that its properties and quality can be assessed. In the present invention, the forming process for the housing 1 is not specifically limited, and the person skilled in the art can carry out the deep drawing process and the forming of the housing 1 using conventional technical means.

[0100] For example, in some embodiments the battery is manufactured as follows: 1. Manufacturing the housing (1) Preparation of the steel: The steel is melted to remove impurities and adjusted to the chemical composition required for housing 1. Once the steel with the composition described above has been obtained, it is cast to obtain a steel ingot; (2) Production of blanks: The steel ingot is rolled into coils, which are then cut into sheets of suitable size; (3) Deep drawing: The sheets are placed in suitable shapes and secured, then the punches are pressed against the shapes with a certain force and the drawing is repeated until the housing 1 is formed. (4) Trimming: The excess material is removed and trimmed during deep drawing to ensure that the burrs and the flatness of the cut meet the requirements. 2. Production of the positive electrode piece:

[0101] The active material for the positive electrode, the conductive agent acetylene black, and the binder PVDF are mixed in a mass ratio of 96:2:2. The solvent NMP is added, and the mixture is stirred under vacuum mixing until homogeneous to obtain the positive electrode slurry. The positive electrode slurry is then evenly applied to both surfaces of the aluminum foil of the positive electrode collector, dried at room temperature, and then placed in an oven for further drying. The final positive electrode component is then produced by cold pressing and cutting. 3. Production of the negative electrode piece:

[0102] The active material for the negative electrode, the conductive agent (SP), and the binder are mixed in a specific mass ratio (97:1:1). Deionized water is added as a solvent, and the system is stirred under vacuum until homogeneous to obtain the negative electrode slurry. The negative electrode slurry is then evenly applied to both surfaces of the copper foil of the negative electrode collector, dried at room temperature, and then placed in an oven for further drying. Finally, the negative electrode component is obtained by cold pressing and cutting. 4. Preparation of the electrolyte solution

[0103] Mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl ethyl carbonate (DEC) according to a volume ratio of 1:1:1 to obtain an organic solvent, adding FEC according to the embodiments and comparative examples, then dissolving LiPF6, a lithium salt that has been sufficiently dried, in the mixed organic solvent and adjusting it to an electrolyte solution with a lithium salt concentration of 1 mol / L. (5) Production of the release film

[0104] In this embodiment, the polyethylene film is selected as the separating film, and the polyethylene film is cut to form the separating film. (6) Production of the lithium-ion battery

[0105] Stack the above positive electrode piece, separating film and negative electrode piece in sequence, so that the separating film is between the positive electrode piece and the negative electrode and can insulate the two, and then wind to obtain a bare electrical core;

[0106] Placing the electrical core in the housing 1 (obtained by the above manufacturing process), connecting the end cap 12 and the housing 1 by laser welding; drying and subsequent injection of the liquid, forming and fixing the capacity, and obtaining the prepared lithium-ion battery.

[0107] The present invention further provides a battery comprising a battery housing as described above.

[0108] The present invention provides a power-consuming device comprising a battery as described above.

[0109] The present invention will be explained in more detail below using specific exemplary embodiments: Example 1-17

[0110] Exemplary embodiments 1-17 each provide a housing 1 wherein the chemical material composition of the housing 1 comprises: C, Si, Mn, P, S, Ti, Nb, Cr and Fe;

[0111] The percentage mass content of C, Si, Mn, P and S, based on the total mass of the steel, is as follows: C: 0.03%, Si: 0.7%, Mn: 0.95%, P: 0.04%, S: 0.03% and Cr: 16%.

[0112] The percentage mass content of Ti and Nb is given in Table 1;

[0113] The rest is Fe.

[0114] As in Fig.Figures 1 to 5 show the height h of the housing 1 after deep drawing and forming, the thickness d of the end wall 11, the thickness f of the side wall 13 of the housing 1, the remaining thickness m of the weak section 2 after the engraved forming of the explosion protection valve, the ratio k of the area of ​​the through-hole 3 after punching to the area of ​​the end wall 11 on which the through-hole 3 is located, and the ratio z of the area of ​​the liquid injection hole 4 to the area of ​​the end wall 11 on which the liquid injection hole 4 is located, as given in Table 1.

[0115] The battery manufacturing process is as follows: 1. Manufacturing the housing (1) Preparation of the steel: The steel is melted to remove impurities and adjusted to the chemical composition required for housing 1. Once the steel with the composition described above has been obtained, it is cast to obtain a steel ingot; (2) Production of blanks: The steel ingot is rolled into coils, the thickness of the coils being adjusted during rolling by adjusting the size, spacing and speed of the rolling bars to produce housings 1 with different end wall thicknesses d; the coils are then cut into sheets of suitable size; (3) Deep drawing: The sheets are placed in suitable dies and secured, then the punches are pressed against the dies with a specific force and the drawing is repeated until the housing 1 is formed. The area of ​​the formed end wall 11 of the housing 1 is 1661.06 mm². 2 . (4) Trimming: The excess material is removed and trimmed during deep drawing to ensure that the burrs and the flatness of the cut meet the requirements. 2. Production of the positive electrode piece:

[0116] The active material for the positive electrode, the conductive agent acetylene black, and the binder PVDF are mixed in a mass ratio of 96:2:2. The solvent NMP is added, and the mixture is stirred under vacuum mixing until homogeneous to obtain the positive electrode slurry. The positive electrode slurry is then evenly applied to both surfaces of the aluminum foil of the positive electrode collector, dried at room temperature, and then placed in an oven for further drying. The final positive electrode component is then produced by cold pressing and cutting. 3. Production of the negative electrode piece:

[0117] The active material for the negative electrode, the conductive agent (SP), and the binder are mixed in a specific mass ratio (97:1:1). Deionized water is added as a solvent, and the system is stirred under vacuum until homogeneous to obtain the negative electrode slurry. The negative electrode slurry is then evenly applied to both surfaces of the copper foil of the negative electrode collector, dried at room temperature, and then placed in an oven for further drying. Finally, the negative electrode component is obtained by cold pressing and cutting. 4. Preparation of the electrolyte solution

[0118] Mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl ethyl carbonate (DEC) according to a volume ratio of 1:1:1 to obtain an organic solvent, adding FEC according to the embodiments and comparative examples, then dissolving LiPF6, a lithium salt that has been sufficiently dried, in the mixed organic solvent and adjusting it to an electrolyte solution with a lithium salt concentration of 1 mol / L. (5) Production of the release film

[0119] In this embodiment, the polyethylene film is selected as the separating film, and the polyethylene film is cut to form the separating film. (6) Production of the lithium-ion battery

[0120] Stack the above positive electrode piece, separating film and negative electrode piece in sequence, so that the separating film is between the positive electrode piece and the negative electrode and can insulate the two, and then wind to obtain a bare electrical core;

[0121] Placing the electrical core in the housing 1 (obtained by the above manufacturing process), connecting the end cap 12 and the housing 1 by laser welding; drying and subsequent injection of the liquid, forming and fixing the capacity, and obtaining the prepared lithium-ion battery. X-ray fluorescence spectrometry (1) Sample preparation: First, the stainless steel sample must be properly treated to facilitate the penetration of X-rays and fluorescence excitation. This may include cutting, grinding, polishing, and other steps to ensure that the sample surface is flat and free from contaminants. (2) X-ray excitation: The surface of the sample is irradiated with high-energy X-rays to excite the characteristic X-ray fluorescence of the individual elements. The wavelength or energy characteristic of these fluorescence spectra corresponds to the element, so that it is possible to determine which elements are contained in the sample. (3) Spectral collection and analysis: The X-rays reflected from the sample surface and the emitted fluorescence spectra are collected by a spectrometer. The type and content of the elements can be determined from the positions and intensities of the characteristic spectral lines. (4) Matrix effect correction: Due to the interaction between different elements in stainless steel (matrix effect), the acquired spectral data must be corrected to eliminate the influence of this interaction on the analysis results and to improve the accuracy of the analysis. (5) Interpretation of the results: Based on the corrected data, the content of the individual elements in the stainless steel can be calculated so that its properties and quality can be assessed.

[0122] The measurement procedure for d, m and f is as follows:

[0123] The thickness of the end wall 11 and the weak section 2 as well as the side wall 13 is measured with an ultrasonic thickness gauge, whereby three different positions of the test object are measured and the average value is determined.

[0124] The measurement procedure for h is as follows:

[0125] The height of housing 1 is measured with a laser height measuring device, and during the measurement three different positions of the test object are measured and the average value is determined.

[0126] The surfaces of the through-hole 3, the liquid injection hole 4 and the end wall 11:

[0127] The diameters of the through hole 3, the liquid injection hole 4 and the end wall 11 are measured with a caliper, and the area of ​​the through hole 3, the liquid injection hole 4 and the end wall 11 is calculated using the formula for the area of ​​a circle, and finally k and z are calculated. Example 18-26

[0128] The embodiments 18-26 are similar to embodiment 1, with the difference that the percentage mass content of Ti and Nb is given in Table 2 and the height h of the housing 1, the thickness d of the end wall 11 and the thickness f of the side wall 13 of the housing 1 after deep drawing and forming are given in Table 2. Exemplary embodiment 27-32

[0129] The embodiments 27-32 are similar to embodiment 1, with the difference that the percentage mass content of Ti and Nb is given in Table 3 and the height h of the housing 1, the thickness d of the end wall 11 and the remaining thickness m of the weak section 2 after the engraving of the explosion protection valve are given in Table 3. Exemplary embodiment 33-38

[0130] Embodiments 33-38 are similar to embodiment 1, with the difference that, as in Fig.Figure 5 shows that the through-hole 3 is located on the end wall 11 and the liquid injection hole 4 is located on the end cap 12. The percentage mass content of Ti and Nb is given in Table 4, and the height h of the housing 1 after deep drawing and forming, the thickness d of the end wall 11, and the ratio k between the area of ​​the through-hole 3 after punching and the area of ​​the end wall 11 on which the through-hole 3 is located are given in Table 4. Exemplary embodiment 39-44

[0131] Embodiments 39-44 are similar to embodiment 1, with the difference that, as in Fig. 3 and Fig.Figure 4 shows that the liquid injection hole 4 is located in the end wall 11 and the through-hole 3 is located in the end cap 12. The percentage mass content of Ti and Nb is given in Table 5, and the height h of the housing 1 after deep drawing and forming, the thickness d of the end wall 11, and the ratio z of the area of ​​the liquid injection hole 4 to the area of ​​the end wall 11 on which the liquid injection hole 4 is located are given in Table 5. Example 45

[0132] Embodiments 39-44 are similar to embodiment 1, with the difference that, as in Fig.Figure 6 shows that the housing is a square housing. The height h of the housing 1 after deep drawing and forming, the thickness d of the end wall 11, the thickness f of the side wall 13 of the housing 1, the remaining thickness m of the weak section 2 after the engraved forming of the explosion protection valve, the ratio k of the area of ​​the through-hole 3 after punching to the area of ​​the end wall 11 on which the through-hole 3 is located, and the ratio z of the area of ​​the liquid injection hole 4 to the area of ​​the end wall 11 on which the liquid injection hole 4 is located are given in Table 1.

[0133] The shaping process for the square housing is as follows: (1) Preparation of the steel: The steel is melted to remove impurities and adjusted to the chemical composition required for housing 1. Once the steel with the composition described above has been obtained, it is cast to obtain a steel ingot; (2) Production of blanks: The steel ingot is rolled into coils, the thickness of the coils being adjusted during rolling by adjusting the size, spacing and speed of the rolling bars to produce housings 1 with different end wall thicknesses d; the coils are then cut into sheets of suitable size; (3) Deep drawing: The sheets are placed in suitable shapes and secured, then the punches are pressed against the shapes with a certain force, a square shape is used and the punch is changed from round to square, the drawing is repeated until the housing 1 is formed. (4) Trimming: The excess material is removed and trimmed during deep drawing to ensure that the burrs and the flatness of the cut meet the requirements. Comparison example 1-3

[0134] The comparative examples 1-3 are similar to embodiment 1, with the difference that the percentage mass content of Ti and Nb, the height h of the housing 1 after deep drawing and forming and the thickness d of the end wall 11 are different, as shown in Table 1. Table 1 h(mm) d(mm) h / d b (wt%) c (wt%) b+c (h / d) / (b+c) f(mm) (f / d) / (b+c) Example 1 80 0,8 100 0,05 0,2 0,25 400 0,6 3,00 Example 2 90 0,6 150 0,15 0,25 0,4 375 0,5 2,08 Example 3 50 1,0 50 0,15 0,2 0,35 143 0,8 2,29 Example 4 270 0,5 540 0,05 0,22 0,27 2000 0,4 2,96 Example 5 40 0,2 200 0,2 0,4 0,6 333 0,15 1,25 Example 6 100 0,8 125 0,4 0,4 0,8 156 0,6 0,94 Example 7 200 1,0 200 0,1 0,1 0,2 1000 0,5 2,50 Example 8 280 1,5 186,7 0,3 0,2 0,5 373 1,2 1,60 Example 9 50 1,0 50 0,2 0,2 0,4 125 0,8 2,00 Example 10 270 0,5 540 0,1 0,15 0,25 2160 0,4 3,20 Example 11 20 0,3 66,7 0,3 0,4 0,7 95 0,25 1,19 Example 12 300 0,5 600 0,1 0,15 0,25 2400 0,1 0,80 Example 13 100 1,2 83,3 0,4 0,4 0,8 104 1 1,04 Example 14 300 0,2 1500 0,1 0,115 0,215 6977 0,1 2,33 Example 15 10 0,2 50 0,25 0,25 0,5 100 0,1 1,00 Example 16 320 1 640 0,05 0,1 0,15 2133 0,3 4,00 Example 17 120 1,6 75 0,4 0,5 0,9 83 0,8 0,56 Example 45 80 0,8 100 0,05 0,2 0,25 400 0,6 3,00 Comparative example 1 20 1 20 0,2 0,3 0,5 40 0,6 1,20 Comparative example 2 300 0,2 1500 0,05 0,15 0,2 7500 0,1 2,50 Comparative example 3 50 1,5 33,3 0,4 0,4 0,8 42 0,8 0,67 Table 2 h(mm) d(mm) h / d b (wt%) c (wt%) b+c (h / d) / (b+ c) f(mm) (f / d) / (b+c) Success rate of deep drawing (%) Pressure resistance (MPa) Example 18 80 0,8 100 0,1 0,2 0,3 333 0,12 0,50 95,3 more than 5 MPa Example 19 80 1,2 66,67 0,05 0,15 0,2 333 1,2 5,00 95,2 more than 5 MPa Example 20 80 1,3 61,54 0,05 0,2 0,25 246 1,3 4,00 92,5 more than 5 MPa Example 21 80 0,3 266,67 0,05 0,2 0,25 1067 0,08 1,07 93,3 more than 5 MPa Example 22 80 0,2 400 0,05 0,1 0,15 2667 0,1 3,33 94,6 more than 5 MPa Example 23 80 0,8 100 0,2 0,3 0,5 200 0,15 0,38 91,2 more than 4 MPa Example 24 80 0,8 100 0,05 0,2 0,25 400 0,06 0,30 90,5 more than 4 MPa Example 25 80 1,3 61,54 0,4 0,4 0,8 77 0,5 0,48 89,8 more than 4 MPa Example 26 80 1 80 0,05 0,1 0,15 533 1 6,67 89,9 more than 4 MPa Table 3 h(mm) d(mm) h / d b (wt%) c (wt%) b+c (h / d) / (b+c) m(mm) m(b+c) Success rate of deep drawing (%) Pressure resistance (MPa) Example 27 80 0,8 100 0,05 0,25 0,3 333 0,4 0,12 94,6 more than 5 MPa Example 28 80 0,8 100 0,1 0,15 0,25 400 0,16 0,04 94,70 more than 5 MPa Example 29 80 0,8 100 0,05 0,17 0,22 455 0,53 0,1166 92,5 more than 5 MPa Example 30 80 1 80 0,05 0,3 0,35 229 0,01 0,0035 91,7 more than 4 MPa Example 31 80 0,8 100 0,05 0,2 0,25 400 0,007 0,0018 88,4 more than 3 MPa Example 32 80 0,8 100 0,05 0,2 0,25 400 0,6 0,15 88,3 more than 4 MPa Table 4 h(mm) d(mm) h / d b (wt%) c (wt%) b+c (h / d) / (b+c) k k / (b + c) Success rate of deep drawing (%) Pressure resistance (MPa) Example 33 80 0,8 100 0,1 0,2 0,3 333 0,0015 0,005 95,5 more than 5 MPa Example 34 80 0,8 100 0,05 0,15 0,2 500 0,1 0,5 93,7 more than 5 MPa Example 35 80 0,8 100 0,1 0,2 0,3 333 0,12 0,4 92,5 more than 5 MPa Example 36 80 0,8 100 0,05 0,15 0,2 500 0,001 0,005 91,7 more than 5 MPa Example 37 80 0,8 100 0,1 0,2 0,3 333 0,00125 0,0042 90 more than 4 MPa Example 38 80 0,8 100 0,1 0,1 0,2 500 0,11 0,55 88,4 more than 4 MPa Table 5 h(mm) d(mm) h / d b (wt%) c (wt%) b+c (h / d) / (b+c) z z / (b + c) Success rate of deep drawing (%) Pressure resistance (MPa) Example 39 80 0,8 100 0,05 0,2 0,25 400 0,001 0,004 94,7 more than 5 MPa Example 40 80 0,8 100 0,05 0,2 0,25 400 0,075 0,3 95,3 more than 5 MPa Example 41 80 0,8 100 0,2 0,2 0,4 250 0,1 0,25 92,5 more than 4 MPa Example 42 80 0,8 100 0,05 0,15 0,2 500 0,0009 0,0045 91,7 more than 5 MPa Example 43 80 0,8 100 0,05 0,2 0,25 400 0,09 0,36 88,2 more than 3 MPa Example 44 80 0,8 100 0,05 0,2 0,25 400 0,0008 0,0032 87,4 more than 4 MPa Performance test:

[0135] The performance test procedures for the above different comparison examples and implementation examples are as follows: 1. Testing the pressure resistance of the housing: (1) Pressure retention test: First, AB adhesive or structural adhesive is used to seal the liquid injection hole 4; then, the housing 1 is loaded into the burst / pressure resistance test tool, the inflation port is connected to the burst instrument, it is set to pressure retention mode, and air is pumped from the opening of the housing 1 to the required pressure (e.g., 3 MPa, 4 MPa, 5 MPa) and held for 30 seconds; (2) Gas tightness test: Helium detection test on the housing 1 is carried out after the pressure holding test; if the leakage rate is ≤ 1 × 10-7 Pa.m3 / s, then the housing 1 is qualified under pressure for pressure resistance. 2. Success rate of the deep-drawing process of the housing

[0136] The deep drawing of the housing 1 is carried out according to the above manufacturing process of the housing 1, and the success rate of the deep drawing forming in the production of 200 housings 1 is counted.

[0137] As can be seen from Table 1, the housings 1 in embodiments 1 to 17 and 45, where the height h of the housing 1, the thickness d of the end wall, the percentage mass content b of Ti and the percentage mass content c of Nb satisfy 50 ≤ (h / d) / (b + c) ≤ 7000, have a higher compressive strength compared to the corresponding comparative examples 1 to 3, and at the same time the local stresses are not so easily concentrated that they cause a fracture during the deep drawing process, and the success rate of the deep drawing forming is higher and it is better suited for the deep drawing process. If the housing 1 meets the requirements of 142 ≤ (h / d) / (b + c) ≤ 2000, the success rate of the deep drawing process is further improved, especially if the housing 1 also meets the requirements of 50mm ≤ h ≤ 270mm, 0.5mm ≤ d ≤ 1.0mm, 0.25wt.% ≤ (b + c) ≤ 0.35wt%, and at the same time the success rate of the deep drawing process of the housing 1 is higher.

[0138] As can be seen from Table 2, in embodiments 18-26, 142 ≤ (h / d) / (b + c) ≤ 2000 is satisfied, and on this basis, considering that the thickness of the side wall 13 of the housing 1 must be smaller than that of the end wall 11 after deep drawing and forming, if the thickness of the side wall 13 is greater than that of the end wall 11, i.e., the tensile strength of the side wall 13 is greater, the deep-drawing property of the material must be higher. As can be seen from embodiments 18-26, the housing 1 has a higher deep-drawing forming rate if 0.5 ≤ f / (b + c) ≤ 5 is satisfied. Furthermore, if the housing 1 also meets the requirements of 0.1mm ≤ f ≤ 1.2mm, the housing 1 is better suited for deep drawing processing and forming, its success rate of deep drawing forming is further improved, and the housing 1 has better compressive strength after deep drawing processing and forming.

[0139] As can be seen from Table 3, in embodiments 27-32, 142 ≤ (h / d) / (b + c) ≤ 2000 is satisfied, and if the weak section 2 of the battery pressure relief structure and the battery housing 1 are formed in one piece by deep drawing, the weak section 2, if 0.01 ≤ m × (b + c) ≤ 0.12 is satisfied, can be made to undergo deep drawing more effectively, and the success rate of the deep drawing of the housing 1 is higher. In particular, if the housing 1 further satisfies 0.05 mm ≤ m ≤ 0.12 mm, the housing 1 is better suited for deep drawing, its success rate of deep drawing is further improved, and the housing 1 has a higher compressive strength after deep drawing.

[0140] As can be seen from Table 4, in embodiments 33-38, 142 ≤ (h / d) / (b + c) ≤ 2000 is fulfilled. If it is necessary to arrange the through-hole 3 for the pole assembly 5 on the end wall 11 of the housing 1, the housing 1 can, if it further fulfills 0.005 ≤ k / (b + c) ≤ 0.5, exhibit a sufficient success rate of the deep-drawing process without reducing the compressive strength. In particular, if the housing 1 further fulfills 0.00125 ≤ k ≤ 0.1, the success rate of the deep-drawing process is further improved, the compressive strength is greater, and the formed housing 1 is more reliable.

[0141] As can be seen from Table 4, in embodiments 39-44, 142 ≤ (h / d) / (b + c) ≤ 2000 is fulfilled. If it is necessary to arrange the liquid injection hole 4 on the end wall 11 of the housing 1, the housing 1, if it further fulfills 0.000225 ≤ z / (b + c) ≤ 0.1, can have a sufficient success rate of the deep drawing without reducing the pressure resistance of the housing 1 after stamping. In particular, if the housing 1 further fulfills 0.000225 ≤ k ≤ 0.1, the success rate of the deep drawing is further improved, the pressure resistance is greater, and the formed housing 1 is more reliable.

[0142] Finally, it should be noted that the above-mentioned embodiments are used only to illustrate the technical solutions of the present invention and not to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, a person with ordinary technical knowledge in the field should understand that the technical solutions of the present invention can be modified or replaced with equivalent solutions without departing from the substance and scope of the technical solutions of the present invention.

[0143] The present invention relates to the technical field of batteries, in particular a battery casing, a battery with the casing, and a power-consuming device. The casing material comprises steel, wherein the steel contains a component of Ti, Nb, and Cr, wherein, based on a total mass of the steel, the percentage by mass of Cr is ≥ 16 wt.%; wherein the casing comprises a side wall and an end wall formed integrally with the side wall; wherein the casing satisfies the following relational equation: 50 ≤ (h / d) / (b + c) ≤ 7000; where h is a height of the casing with a unit of mm; where d is a thickness of the end wall with a unit of mm; where b is the percentage by mass of Ti with a unit of wt.% based on the total mass of the steel; where c is the percentage by mass of Nb with a unit of wt.%.-% based on the total mass of the steel; By controlling the ratio between the Ti and Nb content and the height and thickness of the end wall of the housing, the present invention enables the steel with this Ti and Nb content to meet a deep-drawing processing performance of the battery housing and the formed housing to have better pressure resistance.

Claims

[1] Battery casing, wherein a material of the casing (1) comprises steel, characterized by , that the steel contains a component of Ti, Nb and Cr, wherein, based on a total mass of the steel, the percentage mass content of Cr is ≥ 16 wt.%; wherein the housing (1) comprises a side wall (13) and an end wall (11) which is formed in one piece with the side wall (13); where the housing (1) satisfies the following relational equation: 50 ≤ (h / d) / (b + c) ≤ 7000; where h is a height of the housing (1) with a unit of mm; where d is a thickness of the end wall (11) with a unit of mm; where b is the percentage mass content of Ti with a unit of wt.% based on the total mass of the steel; where c is the percentage mass content of Nb with a unit of wt.% based on the total mass of the steel; [2] Battery housing according to claim 1, characterized by, that the battery casing (1) satisfies the following relational equation: 142 ≤ (h / d) / (b + c) ≤ 2000; [3] Battery housing according to claim 1 or 2, characterized by , that h lies in a range of 20-300 mm. [4] Battery housing according to claim 3, characterized by , that h lies in a range of 50-270 mm. [5] Battery housing according to claim 1 or 2, characterized by , that d lies in a range of 0.2-1.5 mm. [6] Battery housing according to claim 5, characterized by , that d lies in a range of 0.5-1.0 mm. [7] Battery housing according to claim 1, characterized by , that b+c lies in a range of 0.2-0.8 wt.%. [8] Battery housing according to claim 7, characterized by , that b+c lies in a range of 0.25-0.5 wt.%. [9] Battery housing according to claim 7, characterized by , that b lies in a range of 0.05-0.2 wt.%. [10] Battery housing according to claim 7, characterized bythat c lies in a range of 0.17-0.5 wt.%. [11] Battery housing according to claim 1, characterized by , that the battery housing (1) further satisfies the following relation equation: 0.5 ≤ (f / d) / (b + c) ≤ 5, where f is the thickness of the side wall (13) of the housing (1) with a unit of mm. [12] Battery housing according to claim 11, characterized by , that f lies in a range of 0.1-1.2 mm. [13] Battery housing according to claim 11, characterized by , that d lies in a range of 0.3-1.2 mm. [14] Battery housing according to claim 1, characterized by , that a pressure relief structure is arranged at the end wall (11) of the housing (1). [15] Battery housing according to claim 14, characterized by , that the pressure relief structure includes a weak section (2), wherein the housing (1) further satisfies the following relation equation: 0.004≤ m × (b+c) ≤ 0.12, where m is a residual thickness of the weak section (2) with a unit of mm. [16] Battery housing according to claim 15, characterized by , that m lies in a range of 0.01-0.5 mm. [17] Battery housing according to claim 1 or 14, characterized by , that the housing (1) is provided at one end opposite the end wall (11) with an end cap (12), wherein the end cap (12) is firmly connected to the side wall (13), wherein the end wall (11) or the end cap (12) is provided with a through hole (3) for arranging a pole assembly (5). [18] Battery housing according to claim 17, characterized by , that the through-hole (3) is arranged on the end wall (11), that the housing (1) further satisfies the following relationship: 0.005 ≤ k / (b + c) ≤ 0.5, where k is a ratio of the area of ​​the through-hole (3) to the area of ​​the end wall (11) on which the through-hole (3) is located. [19] Battery housing according to claim 18, characterized by , that k lies in a range of 0.00125-0.

1. [20] Battery housing according to claim 1, characterized by , that a liquid injection hole (4) is provided on the end wall (11), that the housing (1) furthermore satisfies the following relation equation: 0.004 ≤ z / (b + c) ≤ 0.3, where z is the ratio of the area of ​​the liquid injection hole (4) to the area of ​​the end wall (11). [21] Battery housing according to claim 20, characterized by , that z lies in a range of 0.001-0.

08. [22] Battery housing according to claim 1, characterized by that the steel also contains a component of C, Si, Mn, P, S and Fe. [23] Battery, characterized by , that it comprises a battery housing according to one of claims 1 to 22. [24] Power-consuming device, characterized thereby, characterized thereby that it comprises a battery according to claim 23.

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