Battery shell, battery monomer, battery pack and electric equipment

Abstract

The invention discloses a battery shell, a battery monomer, a battery pack and electric equipment, and the battery shell comprises a shell body, the content of titanium in the shell body is a, the shell body is provided with a step part which is recessed towards the inner direction of a shell cavity of the shell body, and the step part is provided with a liquid injection hole; the sealing part is arranged on the step part to block a hole channel of the liquid injection hole, the thickness of the sealing part is b1, the unit of the sealing part is mm, the wall thickness of the side, provided with the liquid injection hole, of the shell body is b2, the unit of the sealing part is mm, b1 / b2 is b, the enclosing area of the sealing part is s, the unit of the sealing part is mm < 2 >, and the value range of a * b * s is 1.5-45. According to the invention, the welding quality of the sealing element and the shell body and the balance between the flatness of the shell body can be considered. Therefore, the welding quality of the sealing element and the shell body is ensured, a better sealing effect is obtained, and the flatness of the shell body is ensured at the same time.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery housing, a battery cell, a battery pack, and an electrical device. Background Art

[0002] To meet lightweight requirements, some batteries currently use titanium casings. This ensures sufficient strength to protect the internal cells while reducing the overall weight of the battery. To allow for electrolyte injection, an injection hole is created in the battery casing. During battery production, the hole is sealed after the electrolyte is injected.

[0003] Currently, a sealing member is usually welded to the liquid injection hole to achieve the sealing of the liquid injection hole. However, after the sealing member is welded to the shell body, problems such as poor sealing and poor shell flatness may occur.

[0004] Therefore, how to ensure the flatness of the shell while ensuring the welding quality is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the object of this application is to provide a battery shell to ensure the flatness of the shell while ensuring the welding quality;

[0006] Another object of the present application is to provide a battery cell, a battery pack and an electrical device having the above-mentioned battery housing.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A first aspect of the present application provides a battery housing, comprising:

[0009] A shell body, wherein the content of titanium in the shell body is a, and the shell body is provided with a step portion recessed toward the shell cavity of the shell body, and the step portion is provided with a liquid injection hole;

[0010] The sealing member is provided on the step portion to block the channel of the injection hole. The thickness of the sealing member is b1, in mm. The thickness of the shell wall on the side where the injection hole is provided is b2, in mm. b1 / b2 is b. The enclosed area of ​​the sealing member is s, in mm. 2 , then the value range of a×b×s is 1.5~45.

[0011] The battery shell provided by the present application has a shell body provided with a step portion recessed toward the shell cavity of the shell body, and a seal is provided on the step portion to block the injection hole. At the same time, the value range of a×b×s is controlled within the range of 1.5 to 45, which can balance the welding quality of the seal and the shell body, and the flatness of the shell opening side of the shell body (the side surface where the injection hole is provided). That is, while ensuring the welding quality of the seal and the shell body, the flatness of the shell opening side of the shell body is ensured. It can prevent the problem that the value of a×b×s is too large, the thickness of the seal is too thick, and the area is too large, so that the seal protrudes from the shell surface, resulting in poor flatness of the shell surface. It can also prevent the value of a×b×s from being too small, the thickness of the seal is too thin, and the area is too small, resulting in poor welding quality between the seal and the shell body, leading to poor sealing effect.

[0012] A second aspect of the present application provides a battery cell comprising the battery housing as described in any one of the above items.

[0013] The battery cell provided in this application has all the technical effects of the above-mentioned battery housing, and thus will not be described in detail herein.

[0014] A third aspect of the present application provides a battery pack comprising a battery cell as described in any one of the above items.

[0015] The battery pack provided in this application has all the technical effects of the above-mentioned battery cells, and will not be described in detail herein.

[0016] A fourth aspect of the present application provides an electrical device comprising the battery pack described above.

[0017] The electrical equipment provided in this application has all the technical effects of the above-mentioned battery pack, and will not be described in detail in this article. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 An exploded view of a battery cell disclosed in an embodiment of the present application;

[0020] Figure 2 This is a schematic structural diagram of the housing body on the housing opening side disclosed in an embodiment of the present application;

[0021] Figure 3 A cross-sectional view of a battery cell disclosed in an embodiment of the present application;

[0022] Figure 4 A cross-sectional view of a battery cell disclosed in an embodiment of the present application on the side of the housing opening;

[0023] Figure 5 A partial enlarged view of the battery cell at the location of the seal disclosed in the embodiment of the present application;

[0024] Figure 6 This is a partial enlarged view of the liquid injection hole of the shell body disclosed in the embodiment of this application.

[0025] The meanings of the reference numerals in the figures are as follows:

[0026] 100 - housing body; 101 - injection hole; 1011 - step portion; 1012 - insertion portion;

[0027] 200-seal;

[0028] 300-sealing body;

[0029] 400-battery cell; 401-core hole. DETAILED DESCRIPTION

[0030] The embodiment of the present application discloses a battery housing to ensure the flatness of the housing while ensuring welding quality;

[0031] The embodiments of the present application also disclose a battery cell, a battery pack and an electrical device having the above-mentioned battery housing.

[0032] The following describes the embodiments with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the content of the application described in the claims. Furthermore, the entire contents of the configurations represented by the following embodiments are not limited to those necessary for the solution of the application described in the claims. It should be noted that, for ease of description, only the portions related to the relevant application are shown in the accompanying drawings. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict.

[0033] As vehicle range requirements increase with age, so too does the need for lightweight batteries. For this reason, titanium is currently being used in battery casings. Titanium forms a dense oxide film in many environments, effectively preventing further oxidation and corrosion. This allows titanium-cased batteries to adapt to a variety of harsh chemical environments. For example, in environments containing acidic and alkaline components, their stability is far superior to batteries with casings made of other materials, reducing the risk of battery performance degradation or safety hazards caused by casing corrosion.

[0034] Titanium has a high strength-to-weight ratio, which means that while ensuring the battery casing is strong enough to protect the internal cells, it can also reduce the overall weight of the battery. For weight-sensitive applications such as aerospace and electric vehicles, reducing battery weight can help improve energy efficiency and increase driving range.

[0035] The injection hole needs to be sealed with a sealant. If the sealant is welded directly to the outer surface of the battery casing, it will protrude from the outer surface of the battery casing, affecting the flatness of the battery casing. Based on this, in the prior art, a stepped portion recessed toward the interior of the battery casing is usually provided at the location of the injection hole, and the sealant is fixed to the stepped portion to prevent the sealant from protruding from the outer surface of the battery casing and ensure the flatness of the battery casing.

[0036] However, the higher the titanium content, the harder the battery shell. Excessive hardness will affect the processing of the step, and the depth of the step will affect the welding quality of the seal. In order to ensure the welding quality, the seal may protrude from the outer surface of the battery shell.

[0037] Based on this, the embodiment of the present application discloses a battery shell to ensure the flatness of the shell while ensuring the welding quality. Figure 1 and Figure 2 As shown, the battery housing disclosed in the embodiment of the present application includes a housing body 100 and a sealing member 200 .

[0038] The housing 100 comprises a main body and a cover plate. The housing 100 is used to encapsulate components such as the battery cell and electrolyte. The main body can be of various shapes and sizes, such as a rectangular parallelepiped, cylindrical, or hexagonal prism. The shape of the main body can be determined based on the specific shape and size of the battery cell. The main body can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloys.

[0039] The cover plate is a component that covers the opening of the housing body to isolate the housing from the external environment. The shape of the cover plate can be adapted to the shape of the housing body to match the housing body. The cover plate can be made of a material with a certain hardness and strength (such as aluminum alloy).

[0040] The shell body 100 is a protective structure of the outer layer of the battery cell, which plays the role of accommodating and protecting the internal components (such as the battery cell 400). Figure 4 The main function of the housing body 100 is to prevent harmful substances such as moisture and oxygen from entering the interior, thereby avoiding damage to the battery cells 400, protecting the internal battery cells 400 and other components from external physical impact and chemical corrosion, and ensuring the safety and stability of the battery cells.

[0041] The battery cell 400 is the smallest charge and discharge unit. The battery cell 400 is formed by winding or stacking a positive electrode sheet, a negative electrode sheet, and a separator disposed therebetween. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material. The positive electrode current collector can be made of a metal material such as aluminum foil, nickel foil, stainless steel, or a composite foil formed by a combination of metal and insulating materials. The positive electrode active material includes a positive electrode active main material, a conductive agent, an adhesive, etc. The positive electrode active main material includes one or more lithium-containing positive electrode active materials such as lithium iron phosphate, a ternary material containing nickel, cobalt, and manganese, and lithium iron manganese phosphate.

[0042] Similarly, the negative electrode sheet includes a negative electrode current collector and negative electrode active material. The negative electrode current collector can be made of metal materials such as copper foil, aluminum foil, stainless steel, or a composite foil formed by combining metal and insulating materials. The negative electrode active material includes a negative electrode active main material, a conductive agent, a binder, etc. The negative electrode active main material can include one or more of artificial graphite, natural graphite, silicon carbon, silicon oxide, lithium titanate, and the like. The battery cell 400 has a cell output terminal, which is generally a tab assembly. Depending on the polarity, the tab assembly generally includes a positive tab assembly and a negative tab assembly. The positive tab assembly is electrically connected to the positive output terminal on the housing body 100, and the negative tab assembly is electrically connected to the negative output terminal on the housing body 100. The positive tab assembly and the positive electrode sheet are connected integrally or separately, and the negative tab assembly and the negative electrode sheet are connected integrally or separately. The diaphragm acts as an insulating layer to prevent short circuits inside the battery cell caused by contact between the positive and negative electrodes, and as a semi-permeable layer to prevent larger molecules from passing through and allow small charged ions to pass through.

[0043] The titanium content in the housing body 100 is a, and the housing body 100 is provided with a stepped portion 1011 recessed toward the interior of the housing cavity of the housing body 100. The stepped portion 1011 is provided with an injection hole 101, which communicates with the interior of the housing cavity of the housing body 100. For ease of understanding, the side of the housing body 100 where the injection hole 101 is provided is defined as the housing opening side. The stepped portion 1011 can have any shape, such as polygonal, circular, or elliptical, and the channel of the injection hole 101 can also have polygonal, circular, or elliptical shapes. The coverage area of ​​the stepped portion 1011 is larger than the cross-sectional area of ​​the channel, so that when the seal 200 is secured within the stepped portion 1011, it can completely cover the channel of the injection hole 101, thereby achieving a sealing effect on the channel of the injection hole 101. The channel of the injection hole 101 and the stepped portion 1011 can be designed to have similar shapes to facilitate processing.

[0044] like Figure 5As shown, the seal 200 is disposed on the step 1011 to seal the liquid injection hole 101. The thickness of the seal 200 is b1, and the thickness of the housing on the side of the opening (i.e., the thickness of the housing body 100 on the side where the liquid injection hole 101 is provided) is b2. It should be noted that b1 and b2 need to be expressed in the same unit, for example, both in mm.

[0045] Let b1 / b2 be b, that is, b1 / b2=b. Since b1 and b2 have the same unit, the units of the two are canceled when divided, so b is a constant. The area of ​​the seal 200 is s, in mm 2 , then the value range of a×b×s is 1.5 to 45. It should be noted that a×b×s is a unit-less value.

[0046] For example, specific values ​​of a×b×s may be 1.5, 3, 4.5, 6, 7.5, 9, 10.5, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, etc. This embodiment does not limit the specific values ​​of a×b×s, and those skilled in the art may select them according to their needs.

[0047] In the battery cell disclosed in the embodiments of this application, the liquid injection hole 101 includes a stepped portion 1011 recessed toward the interior of the housing body 100, and the seal 200 is disposed within the stepped portion 1011 to seal the liquid injection hole 101. Simultaneously, by controlling the value range of a×b×s within 1.5 to 45, a balance can be achieved between the weld quality of the seal 200 and the housing body 100 and the flatness of the housing body 100 on the side with the housing opening. This ensures that the weld quality of the seal 200 and the housing body 100 is maintained while also improving the flatness of the housing body 100 on the side with the housing opening.

[0048] The battery shell disclosed in the embodiment of the present application has a shell body 100 provided with a step portion 1011 that is recessed toward the shell cavity of the shell body 100, and a seal 200 is provided on the step portion 1011 to block the injection hole. At the same time, the value range of a×b×s is controlled within the range of 1.5 to 45, which can balance the welding quality of the seal 200 and the shell body 100, and the flatness of the shell opening side of the shell body 100 (the side surface where the injection hole is provided). That is, while ensuring the welding quality of the seal 200 and the shell body 100, the flatness of the shell opening side of the shell body 100 is ensured. It can prevent the a×b×s value from being too large, the thickness of the seal 200 from being too thick, and the area from being too large, so that the seal 200 protrudes from the shell surface, resulting in poor shell surface flatness. It can also prevent the value of a×b×s from being too small, the thickness of the seal 200 being too thin, and the area being too small, resulting in poor welding quality between the seal 200 and the shell body 100, leading to poor sealing effect.

[0049] Those skilled in the art will appreciate that the higher the titanium content of the housing body 100, the greater the housing hardness. Materials with higher hardness also have higher melting points, requiring higher energy input to melt them during welding. Therefore, the higher the titanium content of the housing body 100, the more difficult it is to weld. The lower the titanium content of the housing body 100, the less lightweight the housing body 100 will be.

[0050] Based on this, in a specific embodiment of the present application, the value range of a is: 70% to 99.7%. That is, the titanium content of the housing body 100 can be within the range of 70% to 99.7%, which can meet the requirements of lightweighting and welding difficulty. It can prevent the problem of welding difficulty caused by a too large value, and also prevent the problem of lightweighting failure caused by a too small value.

[0051] Exemplarily, a can be 70%, 75%, 80%, 85%, 90%, 95%, 98.5%, 98.8%, 99%, 99.2%, 99.4%, 99.5%, 99.6%, 99.7%, etc. This embodiment does not limit the specific value of a, that is, the titanium content of the shell body 100, and those skilled in the art can make a choice according to their needs.

[0052] In a specific embodiment of the present application, the value of b ranges from 0.13 to 1.33. Specifically, the ratio of the thickness b1 of the seal 200 to the thickness b2 of the housing opening is controlled within the range of 0.13 to 1.33. When b is within the range of 0.13 to 1.33, both the flatness of the housing opening side and the welding quality requirements of the housing body 100 are met, ensuring both the flatness of the housing opening side and the welding quality.

[0053] Exemplarily, b can be 0.13, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.33, etc. This embodiment does not limit the specific value of b, that is, the ratio of the thickness b1 of the seal 200 to the thickness b2 of the shell opening side, and those skilled in the art can make a choice according to their needs.

[0054] In a specific embodiment of the present application, the value range of s is: 12.5mm 2 ~65.4mm 2 The area of ​​the seal 200 is controlled at 12.5mm 2 ~65.4mm 2 Range. s within 12.5mm 2 ~65.4mm 2When the flatness of the shell opening side and the welding quality requirements of the shell body 100 are within the range, both the flatness of the shell opening side and the welding quality can be taken into consideration, thereby ensuring both the flatness of the shell opening side and the welding quality.

[0055] For example, s may be 12.5 mm 2 , 15mm 2 , 17.5mm 2 , 20mm 2 , 22.5mm 2 , 25mm 2 , 27.5mm 2 , 30mm 2 , 32.5mm 2 , 35mm 2 , 37.5mm 2 , 40mm 2 , 42.5mm 2 , 45mm 2 , 47.5mm 2 , 50mm 2 , 52.5mm 2 , 55mm 2 , 57.5mm 2 , 60mm 2 , 62.5mm 2 , 65mm 2 、65.4mm 2 The present embodiment does not limit the specific value of s, that is, the area of ​​the sealing member 200 , and those skilled in the art can select it according to their needs.

[0056] For ease of understanding, the surface of the seal 200 facing the outside of the shell body 100 (i.e., the surface away from the shell cavity) is defined as the outer surface of the nail cap, and the outer side of the shell body 100 is the side of the shell body 100 facing away from the battery cell 400 (i.e., the side away from the shell cavity). In this embodiment, the outer surface of the nail cap can be designed to be flush with the outer surface of the shell opening side. It should be noted that the outer surface of the nail cap of the seal 200 can be on the same plane, or it can be designed so that different areas are on different planes, so that the outer surface of the nail cap is stepped. When the outer surface of the nail cap is not on the same plane, the outer surface of the nail cap is flush with the outer surface of the shell opening side, which means that the minimum distance between the outer surface of the nail cap and the outer surface of the shell opening side is 0, that is, the surface of the outer surface of the nail cap farthest from the battery cell 400 is flush with the outer surface of the shell opening side.

[0057] With such a configuration, the thickness b1 of the seal 200 can be maximized while ensuring that the seal 200 does not protrude from the outer surface of the shell opening side, that is, the seal 200 has a certain thickness, so that the seal 200 and the shell body 100 have better welding quality; based on this, the area of ​​the seal 200 can be designed to be smaller.

[0058] In this embodiment, when the outer surface of the nail cap is designed to be flush with the outer surface of the housing opening side, the value range of s can be designed to be: 12.5mm 2 ~48.9mm 2 , for example, s can be 12.5mm 2 , 14mm 2 , 16.5mm 2 , 19mm 2 , 21.5mm 2 , 24mm 2 , 26.5mm 2 , 29mm 2 , 31.5mm 2 , 34mm 2 , 36.5mm 2 , 39mm 2 , 41.5mm 2 , 44mm 2 , 46.5mm 2 , 48.9mm 2 That is, in this embodiment, the upper limit of s can be reduced, so that the area of ​​the sealing member 200 can be within a smaller range, which can also meet the use requirements.

[0059] In another embodiment of the present application, the outer surface of the nail cap can be designed to be closer to the battery cell 400 in the shell body 100 (i.e., closer to the shell cavity) than the outer surface of the shell opening side. Taking the liquid injection hole 101 as an example, when the outer surface of the nail cap is closer to the battery cell 400 in the shell body 100 than the outer surface of the shell opening side, it means that the outer surface of the nail cap is located above the bottom plane of the shell body 100 (i.e., the outer surface of the shell opening side).

[0060] That is, along the height direction of the shell body 100 (when the shell body 100 is a cylindrical structure, the height direction of the shell body 100 is the axial direction of the shell body 100), the surface of the seal 200 away from the shell cavity is higher than the surface of the shell opening side of the shell body 100 away from the shell cavity, and the shell opening side is the side of the shell body 100 where the injection hole 101 is set.

[0061] With such a configuration, under the premise that the seal 200 does not protrude from the outer surface of the shell opening side, the thickness b1 of the seal 200 is not maximized, that is, when the depth of the step portion 1011 is constant, the thickness of the seal 200 is thinner than that of the previous embodiment, so that the welding quality of the seal 200 and the shell body 100 is not as good as that of the previous embodiment; based on this, the area of ​​the seal 200 can be designed to be larger to compensate for the poor sealing effect caused by insufficient thickness of the seal 200.

[0062] In this embodiment, when the outer surface of the nail cap is designed to be closer to the battery cell 400 than the outer surface of the housing opening side, the value range of s can be designed to be: 45.6mm 2 ~65.4mm 2 That is, in this embodiment, the lower limit of s can be increased so that the area of ​​the sealing member 200 can be within a larger range of values ​​to compensate for the poor sealing effect caused by insufficient thickness.

[0063] For example, s may be 45.6 mm 2 , 47.6mm 2 , 50.6mm 2 , 53.6mm 2 , 56.6mm 2 , 58.6mm 2 、60.6mm 2 、62.6mm 2 , 64mm 2 、65.4mm 2 The present embodiment does not limit the specific value of s, that is, the area of ​​the sealing member 200 , and those skilled in the art can select it according to their needs.

[0064] like Figure 5 As shown, specifically, the distance between the outer surface of the nail cap and the outer surface of the housing opening side is L, that is, in the height direction of the housing body 100, the distance between the surface of the seal 200 away from the housing cavity and the surface of the housing opening side away from the housing cavity is L, then L≤0.15mm. Exemplarily, the distance L between the outer surface of the nail cap and the outer surface of the housing opening side can be 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, etc. This embodiment does not limit the specific value of L, and those skilled in the art can select it according to needs.

[0065] like Figure 5As shown, in one embodiment of the present application, the battery cell may further include a sealing body 300 inserted into the channel of the liquid injection hole 101, and the sealing member 200 is farther away from the housing cavity of the housing body 100 than the sealing body 300. The sealing body 300 is the first seal of the liquid injection hole 101, while the sealing member 200 is the second seal of the liquid injection hole 101. By providing two seals, the sealing effect of the liquid injection hole 101 can be further improved to prevent electrolyte leakage.

[0066] The material of the sealing body 300 can be rubber (such as nitrile rubber, fluororubber, etc.), plastic (polypropylene, polytetrafluoroethylene, etc.), silicone, etc. Nitrile rubber has excellent oil resistance, good tolerance to electrolyte, and is not easily corroded or swollen. At the same time, it has good elasticity and sealing performance, can fit tightly into the channel of the injection hole 101, and prevent electrolyte leakage. Fluororubber has excellent high temperature resistance and chemical corrosion resistance, can withstand high temperatures and highly corrosive electrolytes, and still maintain good sealing performance and physical properties under high temperature environments. Polypropylene has the characteristics of light weight and low cost, good chemical stability, and a certain tolerance to general electrolytes. It has good molding and processing performance and can be made into seals of various shapes and specifications to meet the sealing requirements of different injection holes. Polytetrafluoroethylene has extremely excellent chemical stability and excellent corrosion resistance to electrolytes. At the same time, it has a low friction coefficient, a smooth surface, is easy to install, and has outstanding high temperature resistance. Silicone rubber has good high and low temperature resistance and can maintain elasticity and sealing performance over a wide temperature range. Those skilled in the art can select the material of the sealing body 300 according to needs.

[0067] In this embodiment, due to the addition of the sealing body 300, the liquid injection hole 101 has two seals, which improves the sealing effect of the liquid injection hole 101. Therefore, the value of b can be designed to be smaller and can also meet the sealing requirements.

[0068] In a specific embodiment of the present application, the value range of b is: 0.13~0.56, that is, the ratio of the thickness b1 of the seal 200 and the thickness b2 of the shell opening side is controlled within the range of 0.13~0.56. For example, b can be 0.13, 0.18, 0.23, 0.35, 0.38, 0.4, 0.43, 0.47, 0.5, 0.52, 0.54, 0.56, etc. That is, in this embodiment, the upper limit value of b can be reduced so that the thickness of the seal 200 can be within a smaller value range, which can also meet the use requirements. Under the premise of being able to meet the sealing requirements, reducing the thickness of the seal 200 can reduce processing costs and reduce the probability of the seal 200 protruding from the outer surface of the shell opening side.

[0069] A battery cell 400 is provided in the shell body 100. The battery cell 400 has a core hole 401, and the core hole 401 is located at the center of the battery cell winding structure. In a cylindrical battery cell, the core hole 401 is at the axis of the entire battery cell 400; in a square battery cell, the core hole is also located in the center area of ​​the winding part. The shape can vary according to design requirements. Common ones include a runway-shaped or approximately square through-structure. The battery cell 400 generates heat during the charging and discharging process. Good heat dissipation is essential to maintaining the performance and safety of the battery cell 400. The core hole 401 can assist in heat dissipation to a certain extent. Air or other media can flow in the core hole 401, taking away some of the heat and reducing the temperature gradient inside the battery cell 400.

[0070] In a specific embodiment of the present application, the liquid injection hole 101 includes an insertion portion 1012 that extends into the winding core hole 401. It should be noted that the lumen of the insertion portion 1012 can be understood as the channel of the liquid injection hole 101. When a sealing body 300 is provided, the sealing body 300 can be inserted into the lumen of the insertion portion 1012 to block the lumen of the insertion portion 1012. The sealing member 200 is further away from the battery cell 400 than the sealing body 300.

[0071] Since the insertion portion 1012 extends into the winding core hole 401, when the electrolyte is injected into the injection hole 101, the insertion portion 1012 can produce a diversion effect, guiding the electrolyte to flow into the winding core hole 401, making it less likely for the electrolyte to leak during the injection process. Therefore, the value of b can be smaller. In this embodiment, the upper limit of b can be further reduced based on the previous embodiment. Specifically, the value range of b can be: 0.13~0.45, so that the thickness of the seal 200 can be within a smaller value range, which can also meet the use requirements.

[0072] like Figure 6 As shown, the step portion 1011 and the insert portion 1012 are formed by a stamping process on the housing opening side of the housing body 100 , and the overlapping dimension of the insert portion 1012 and the winding core hole 401 in the axial direction is h.

[0073] In this embodiment, the height h of the insertion portion 1012 can range from 0.4 mm to 2 mm. When h is within the range of 0.4 mm to 2 mm, both the flatness of the housing opening and the risk of electrolyte leakage are taken into account. This facilitates the injection of electrolyte into the winding core hole 401 and prevents leakage during injection, while also ensuring the flatness of the housing opening without increasing the difficulty of stamping.

[0074] Exemplarily, h can be 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc. This embodiment does not limit the specific value of h, that is, the axial overlapping size between the insertion portion 1012 and the core hole 401. Those skilled in the art can choose according to their needs.

[0075] The step portion 1011 and the insert portion 1012 may be coaxially arranged. The step portion 1011 and the insert portion 1012 may be stamped simultaneously or sequentially by a die.

[0076] like Figure 4 As shown, along the radial direction of the sealing member 200, the edge of the sealing member 200 exceeds the edge of the opening of the liquid injection hole 101. The opening of the liquid injection hole 101 is the tube mouth of the liquid injection hole 101 located on the step portion 1011. The edge of the sealing member 200 needs to exceed the opening of the liquid injection hole 101 to achieve sealing of the liquid injection hole 101.

[0077] In this embodiment, the edge of the sealing member 200 extends beyond the edge of the liquid injection hole 101 by a range of 1 mm to 4 mm, ensuring that the sealing member 200 completely covers the liquid injection hole 101. The edge of the sealing member 200 can extend beyond the edge of the liquid injection hole 101 by 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc. This embodiment does not limit the specific length of the edge of the sealing member 200 extending beyond the edge of the liquid injection hole 101, and those skilled in the art can select the length as needed.

[0078] The seal 200 includes a welding zone welded to the housing body 100. Specifically, the area where the seal 200 is welded to the housing body 100 is the welding zone. The stepped portion 1011 includes a bottom wall portion and a sidewall portion surrounding the bottom wall portion. The bottom wall portion of the stepped portion 1011 may be parallel to the surface of the housing body 100 on the side of the housing opening. The injection hole 101 is used to inject electrolyte into the cavity of the housing body 100. The injection hole 101 can be a channel directly opened in the bottom wall portion of the stepped portion 1011, or it can be an insertion portion 1012 extending from the bottom wall portion of the stepped portion 1011 into the winding core hole 401.

[0079] In this embodiment, the welding area is located on the contact surface between the seal 200 and the bottom wall of the step portion 1011, that is, the plate surface of the seal 200 facing the bottom wall of the step portion 1011 is welded to the bottom wall. Therefore, the seal 200 and the step portion 1011 need to be welded by penetration welding. Penetration welding mainly relies on a high-energy-density welding heat source, such as a laser beam, electron beam, etc., to rapidly heat the seal 200 to a molten state so that the weld metal can penetrate the thickness of the seal 200. Taking laser penetration welding as an example, a high-energy laser beam is focused on the surface of the seal 200, instantly generating extremely high temperatures, causing the surface material of the seal 200 to rapidly melt to form a molten pool. As the laser beam moves, the molten pool continuously advances forward and penetrates the seal 200. After the molten pool cools and solidifies, a weld that penetrates the thickness of the seal 200 is formed.

[0080] When the seal 200 and the step portion 1011 are welded through, in order to ensure welding quality, the value of b needs to be larger, that is, the thickness of the seal 200 needs to be larger to ensure the sealing effect of the seal 200 on the injection hole 101. In this embodiment, the value range of b can be: 0.6 to 1.33. For example, b can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.33, etc. That is, in this embodiment, the lower limit of b can be increased so that the thickness of the seal 200 can be within a larger range of values ​​to ensure welding quality.

[0081] In another embodiment of the present application, the welding area is at least partially located on the outer edge of the sealing member 200 facing the side wall portion, that is, the outer side surface of the sealing member 200 is welded to the side wall portion of the step portion 1011, so the sealing member 200 and the step portion 1011 need to be butt-welded. Butt welding uses the resistance heat generated when the current passes through the sealing member 200 and the step portion 1011 as a heat source to rapidly heat the surfaces of the butted sealing member 200 and the step portion 1011. During the welding process, the resistance on the contact surface of the sealing member 200 and the step portion 1011 converts electrical energy into thermal energy, causing the metal in this area to reach a plastic or molten state. As the heating proceeds, the metal on the butting surfaces gradually fuses together, firmly bonding the two parts of metal together to form a dense weld.

[0082] When the sealing member 200 and the step portion 1011 are butt-welded, in order to ensure the welding quality, the area of ​​the sealing member 200 needs to be larger. In this embodiment, the value range of s can be: 45mm 2 ~65.4mm 2That is, in this embodiment, the lower limit of s can be increased so that the area of ​​the sealing member 200 can be within a larger range, so that the sealing member 200 and the side wall of the step portion 1011 can fit or approach each other, ensuring that welding can be completed.

[0083] For example, s can be 45 mm 2 , 46.5mm 2 , 47.6mm 2 , 48.9mm 2 , 50.6mm 2 , 51.7mm 2 , 53.6mm 2 , 55.3mm 2 , 56.6mm 2 , 58.6mm 2 、60.6mm 2 、61.4mm 2 、62.6mm 2 , 63.4mm 2 , 64mm 2 、64.8mm 2 、65.4mm 2 The present embodiment does not limit the specific value of s, that is, the area of ​​the sealing member 200 , and those skilled in the art can select it according to their needs.

[0084] In a specific embodiment of the present application, along the radial direction of the step portion 1011, the minimum distance from the edge of the step portion 1011 to the edge of the shell opening side can range from 3mm to 21.5mm. The edge of the step portion 1011 is where the sidewall portion of the step portion 1011 is located. Taking the battery cell as a cylindrical battery as an example, the shell opening side can be one of the end faces of the shell body 100, which end face is also a circular structure, and the injection hole 101 can also be circular. In this way, the edge of the step portion 1011 is the largest outer circle of the injection hole 101, and the edge of the shell opening side is the outer circle of the end face of the shell body 100.

[0085] In this embodiment, the minimum distance from the edge of the step 1011 to the edge of the housing opening is designed to be 3 mm to 21.5 mm. Given a given size for the housing opening, this balance can be achieved between electrolyte injection and strength of the housing opening. This facilitates electrolyte injection while ensuring strength of the housing opening.

[0086] The minimum distance between the edge of the step portion 1011 and the edge of the housing opening can be 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 17 mm, 19 mm, 20 mm, 21 mm, 21.5 mm, etc. This embodiment does not limit the minimum distance between the edge of the step portion 1011 and the edge of the housing opening, and those skilled in the art can select it according to their needs.

[0087] In a specific embodiment of the present application, the shell body 100 includes a shell main body and a cover plate. At least one end of the shell main body has an opening for assembling the battery cell 400. The battery cell 400 is inserted into the cavity of the shell main body through the opening. After the battery cell 400 and other components are assembled, they are fixed to the shell main body through the cover plate to seal the opening of the shell main body.

[0088] The thickness of the cover plate is generally greater than that of the housing body. When the liquid injection hole 101 is located in the housing body, the housing body is thinner, making it easier to stamp the liquid injection hole 101 there. Therefore, the depth of the step 1011 is easier to ensure. To ensure better welding quality, the value of b can be larger, meaning the thickness of the seal 200 can be increased to ensure that the seal 200 effectively seals the liquid injection hole 101.

[0089] In this embodiment, the value range of b can be: 0.65-1.33. For example, b can be 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.33, etc. In other words, in this embodiment, the lower limit of b can be increased so that the thickness of the sealing member 200 can be within a larger range of values ​​to ensure the sealing effect of the sealing member 200 on the liquid injection hole 101.

[0090] When the injection hole 101 is located on the cover plate, the injection hole 101 is difficult to be stamped on the cover plate due to the thickness of the cover plate. Therefore, the depth of the step portion 1011 is not easy to ensure, resulting in insufficient depth of the step portion 1011. In order to ensure that the seal 200 does not protrude from the outer surface of the shell opening side, the value of b needs to be smaller, that is, the thickness of the seal 200 needs to be reduced to avoid the seal 200 protruding from the outer surface of the shell opening side and ensure the flatness of the shell opening side.

[0091] In this embodiment, the value range of b can be: 0.13-0.62, that is, the ratio of the thickness b1 of the seal 200 to the thickness b2 of the shell opening side is controlled within the range of 0.13 to 0.62. For example, b can be 0.13, 0.18, 0.23, 0.35, 0.38, 0.4, 0.43, 0.47, 0.5, 0.52, 0.54, 0.56, 0.6, 0.62, etc. That is, in this embodiment, the upper limit value of b can be reduced so that the thickness of the seal 200 can be within a smaller range of values. Under the premise of being able to meet the sealing requirements, reducing the thickness of the seal 200 can reduce processing costs, prevent the seal 200 from bulging out from the outer surface of the shell opening side, and ensure the flatness of the shell opening side.

[0092] In a specific embodiment of the present application, when the housing body 100 is cylindrical, the injection hole 101 is located at the center of the housing opening. If the cross-section of the injection hole 101 is circular, the injection hole 101 is coaxially arranged with the housing body 100. The injection hole 101 is located at the center of the housing opening. When stamping the injection hole 101, the force is relatively uniform, the injection hole 101 is easier to form, and it is easier to ensure the depth of the step 1011. To ensure better welding quality, the value of b can be larger, that is, the thickness of the seal 200 can be increased to ensure the sealing effect of the seal 200 on the injection hole 101.

[0093] In this embodiment, the value range of b can be: 0.5-1.33. For example, b can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.33, etc. In other words, in this embodiment, the lower limit of b can be increased so that the thickness of the sealing member 200 can be within a larger range of values ​​to ensure welding quality.

[0094] In another specific embodiment of the present application, the shell body 100 is a rectangular parallelepiped structure, and the injection hole 101 is offset and arranged at the center of the shell opening side (i.e., the surface of one side of the shell body 100). The shell opening side is a rectangular structure, and the injection hole 101 is usually not arranged at the center of the shell opening side, but is arranged on one side. When the injection hole 101 is stamped and formed, due to the offset setting of the injection hole 101, if the step portion 1011 is to have a sufficient depth and cross-sectional area during stamping, a sufficiently large stamping force is required, which can easily cause the shell opening side to deform and affect the flatness of the shell opening side. In order to prevent the shell opening side from being deformed during stamping, it is usually necessary to reduce the depth and cross-sectional area of ​​the step portion 1011.

[0095] Based on this, in this embodiment, the value of b can be smaller, that is, the thickness of the sealing member 200 is reduced to ensure that the sealing member 200 does not protrude from the outer surface of the housing opening side, thereby ensuring the flatness of the housing opening side.

[0096] In this embodiment, the value range of b can be: 0.13-0.5, that is, the ratio of the thickness b1 of the seal 200 to the thickness b2 of the shell opening side is controlled within the range of 0.13 to 0.5. For example, b can be 0.13, 0.15, 0.18, 0.2, 0.23, 0.30, 0.35, 0.38, 0.4, 0.43, 0.47, 0.5, etc. That is, in this embodiment, the upper limit value of b can be reduced so that the thickness of the seal 200 can be within a smaller range of values. Under the premise of being able to meet the sealing requirements, reducing the thickness of the seal 200 can reduce processing costs, prevent the seal 200 from bulging out from the outer surface of the shell opening side, and ensure the flatness of the shell opening side.

[0097] The material of the housing body 100 may include at least one of aluminum, vanadium, tin, and molybdenum in addition to titanium. That is, in this embodiment, the material of the housing body 100 is titanium alloy. Using titanium alloy as the material of the housing body 100 can reduce costs and improve welding strength.

[0098] In a specific embodiment of the present application, the material of the seal 200 can be titanium or a titanium alloy. Titanium alloys are mainly divided into three categories: 1. α-type titanium alloys (such as TA2), which contain α-stabilizing elements such as aluminum and are suitable for extreme temperature environments; 2. β-type titanium alloys (such as Ti-15-3), which contain β-stabilizing elements such as molybdenum and have excellent high-temperature strength; 3. α+β-type titanium alloys (such as Ti-6Al-4V), which have balanced overall performance and account for more than 70% of titanium used in aviation.

[0099] When the material of the seal 200 is titanium or titanium alloy, the seal 200 has high hardness and high welding melting point. In order to facilitate welding, the value of b can be smaller, that is, the thickness of the seal 200 needs to be reduced to prevent the thickness of the seal 200 from being too large, which is not conducive to welding.

[0100] In this embodiment, the value range of b can be: 0.13-0.45, that is, the ratio of the thickness b1 of the sealing member 200 to the thickness b2 of the housing opening side is controlled within the range of 0.13 to 0.45. For example, b can be 0.13, 0.15, 0.18, 0.2, 0.23, 0.30, 0.35, 0.38, 0.4, 0.43, 0.45, etc. In other words, in this embodiment, the upper limit of b can be reduced so that the thickness of the sealing member 200 can be within a smaller range of values. By reducing the thickness of the sealing member 200, the problem of difficulty in welding caused by the high hardness and high melting point of the sealing member 200 can be balanced.

[0101] In a specific embodiment of the present application, the material of the seal 200 can be aluminum or an aluminum alloy. Aluminum alloys include but are not limited to cast aluminum alloys, deformed aluminum alloys, and aluminum-based composite materials. When the seal 200 is made of aluminum or an aluminum alloy, the hardness of the seal 200 is relatively low, and the welding melting point is relatively low, making it easier to weld the seal 200 to the housing body 100. To ensure a good sealing effect, the value of b can be larger, that is, the thickness of the seal 200 can be increased to ensure that the seal 200 seals the injection hole 101.

[0102] In this embodiment, the value range of b can be: 0.5-1.33. For example, b can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.33, etc. In other words, in this embodiment, the lower limit of b can be increased so that the thickness of the sealing member 200 can be within a larger range of values ​​to ensure the sealing effect of the sealing member 200 on the liquid injection hole 101.

[0103] Based on this, in a specific embodiment of the present application, the thickness b1 of the sealing member 200 can be in the range of 0.1 mm to 0.4 mm. In this embodiment, controlling the thickness b1 within the range of 0.1 mm to 0.4 mm can strike a balance between welding strength and forming difficulty, thereby ensuring welding strength while reducing forming difficulty.

[0104] Illustratively, the thickness b1 of the seal 200 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, etc. This embodiment does not limit the specific value of the thickness b1 of the seal 200, and those skilled in the art may select it according to needs.

[0105] Those skilled in the art will appreciate that the housing opening side of the housing body 100 may be integrally stamped and formed with the housing body 100, or the housing opening side of the housing body 100 may be stamped and formed separately from the main body of the housing body 100. When the housing opening side of the housing body 100 is integrally stamped and formed with the housing body 100, the molding process becomes more difficult. In particular, if the thickness b2 of the housing opening side (since the housing opening side and the other parts of the housing body 100 are an integral structure and therefore have substantially the same thickness) is too large, the molding process becomes even more difficult.

[0106] When the shell opening side of the shell body 100 and the main part of the shell body 100 are stamped and formed separately, the shell opening side is the cover plate of the shell body 100. The structure of the cover plate is relatively complex. If the thickness b2 of the shell opening side is too large, it will also increase the difficulty of forming the shell opening side.

[0107] If the thickness b2 of the shell opening side is too small, although it is easier to form, it will affect the welding of the seal 200 on the shell opening side, and there is a risk of welding through the shell opening side during welding.

[0108] Based on this, in a specific embodiment of the present application, the thickness b2 of the housing body 100 on the housing opening side can be in the range of 0.3 mm to 0.8 mm. In this embodiment, controlling the thickness b2 within the range of 0.3 mm to 0.8 mm can achieve a balance between welding strength and forming difficulty.

[0109] For example, the thickness b2 of the shell opening side can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc. This embodiment does not limit the specific value of the thickness b2 of the shell opening side, and those skilled in the art can choose according to their needs.

[0110] The present application also discloses a battery cell, including the battery housing disclosed in the above embodiment. The battery cell disclosed in the present application also has all the technical effects of the above battery housing, which will not be described in detail herein.

[0111] The present application also discloses a battery pack comprising the battery cells disclosed in the above embodiments. The battery pack disclosed in the present application, because it includes the above-described battery cells, combines all the technical benefits of the above-described battery cells, which will not be further described herein. It should be noted that the battery pack can be used as a start-stop power supply and can also be used in other fields.

[0112] The present application also discloses an electrical device comprising the battery pack disclosed in the above embodiment. The electrical device may be an electric vehicle, an electric ship, an aircraft, an energy storage device, or the like. The electrical device disclosed in the present application, because it includes the above battery pack, has all the technical effects of the above battery pack, which will not be further described herein.

[0113] The test method for the titanium content in the battery shell is as follows:

[0114] (1) Sample preparation: First, the battery case sample to be tested needs to be properly processed to facilitate X-ray penetration and excitation of fluorescence. Processing methods may include cutting, grinding, polishing, etc. to ensure that the surface of the battery case sample is flat and free of contamination.

[0115] (2) X-ray excitation: High-energy X-rays are used to irradiate the surface of the battery case sample, stimulating the characteristic X-ray fluorescence of each element. The wavelength or energy characteristics of these fluorescence spectra correspond to the type of element, thus determining which elements are contained in the battery case sample.

[0116] (3) Spectral collection and analysis: The X-rays and fluorescence spectra reflected from the surface of the battery case sample are collected by a spectrometer. The type and content of the element can be determined by the position and intensity of the characteristic spectral lines.

[0117] (4) Matrix effect correction: Due to the interaction between various elements in the battery shell sample (matrix effect), the collected spectral data needs to be corrected to eliminate the influence of this interaction on the analysis results and improve the accuracy of the analysis.

[0118] (5) Interpretation of results: Based on the corrected data, the content of each element in the battery shell sample can be calculated, and then the proportion of the mass of the Ti element in the battery shell sample to the total mass of the battery shell sample, that is, the Ti element content a, can be obtained.

[0119] In order to verify the technical effect of the battery case disclosed in the embodiment of the present application, the battery case was subjected to flatness testing and sealing effect testing (such as testing of weld depth and weld width). The specific testing method is as follows, and the specific test results are detailed in Table 1.

[0120] Flatness test method: Place the side of the battery shell to be tested with the injection hole (i.e., the shell opening side) on a marble surface, and then use a height meter probe to measure the flatness of the shell opening side. Randomly select six points and record the height difference. The maximum value is the flatness. Flatness ≤ 0.15mm is qualified.

[0121] Sealing effect - test method for weld depth and weld width: After welding the sealant, the battery shell is encapsulated with crystal glue, and then the weld wire to be measured is cut and polished. The weld depth and weld width of the weld wire are measured using a quadratic element. The weld depth > 0.3mm and the weld width > 0.5mm are qualified.

[0122] Table 1 Comparison of battery shell flatness and sealing effect test

[0123]

[0124] In Examples 1 to 6, the titanium content a, the enclosed area s of the seal, and the ratio b of the thickness b1 of the seal to the shell wall thickness b2 on the side of the shell body where the injection hole is set, all three parameters meet the specified range (the value range of a is: 70% to 99.7%; the value range of s is: 12.5mm 2 ~65.4mm 2 ; The value range of b is: 0.13~1.33), and when a×b×s also meets the limited range (the range of a×b×s is: 1.5~45), the flatness of the battery shell and the sealing effect reflected by the weld depth and weld width are both excellent.

[0125] In Examples 7 to 11, the titanium content a, the enclosed area s of the seal, and the ratio b of the thickness b1 of the seal to the shell wall thickness b2 on the side of the shell body where the injection hole is provided, at least one of the three parameters is not within the range (the value range of a is: 70% to 99.7%; the value range of s is: 12.5mm 2 ~65.4mm 2 ; The value range of b is: 0.13~1.33), but a×b×s meets the limited range (the range of a×b×s is: 1.5~45), the flatness of the battery shell and the sealing effect reflected by the weld depth and weld width can also meet the requirements, but the comprehensive ability of flatness and sealing effect is slightly worse than that when both parameters and a×b×s meet the limited range.

[0126] Comparative Examples 1-2, the titanium content a, the enclosed area s of the seal, and the ratio b of the thickness b1 of the seal to the shell wall thickness b2 on the side of the shell body where the injection hole is provided, at least one of the three parameters is not within the specified range (the value range of a is: 70% to 99.7%; the value range of s is: 12.5mm 2 ~65.4mm 2 ; The value range of b is: 0.13~1.33), and a×b×s does not meet the range (the range of a×b×s is: 1.5~45).

[0127] In Comparative Example 1, a exceeds the upper limit, b is lower than the lower limit, and a×b×s is lower than the lower limit. Its weld depth and weld width do not meet the requirements, and the sealing effect is poor.

[0128] In Comparative Example 2, b exceeds the upper limit, s exceeds the upper limit, and a×b×s exceeds the upper limit. The flatness does not meet the requirements and is poor.

[0129] In comparative examples 3 to 4, the titanium content a, the enclosed area s of the seal, and the ratio b of the thickness b1 of the seal to the shell wall thickness b2 on the side of the shell body where the injection hole is provided, all three parameters meet the specified range (the value range of a is: 70% to 99.7%; the value range of s is: 12.5 mm2 ~65.4mm 2 ; The value range of b is: 0.13~1.33), and a×b×s does not meet the range (the range of a×b×s is: 1.5~45).

[0130] In Comparative Example 3, a×b×s exceeds the upper limit, its penetration depth and width do not meet the requirements, and its flatness does not meet the requirements, and the flatness is poor;

[0131] In Comparative Example 4, a×b×s is lower than the lower limit, its weld depth and weld width do not meet the requirements, and the sealing effect is poor.

[0132] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0133] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0134] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0135] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A battery housing, characterized in that: include: A shell body (100), wherein the content of titanium element in the shell body (100) is a, and the shell body (100) is provided with a step portion (1011) recessed toward the inside of the shell cavity of the shell body (100), and the step portion (1011) is provided with a liquid injection hole (101); A sealing member (200), the sealing member (200) is arranged on the step portion (1011) to block the passage of the injection hole (101), the thickness of the sealing member (200) is b1, the unit is mm, the shell wall thickness of the shell body (100) on the side where the injection hole (101) is arranged is b2, the unit is mm, b1 / b2 is b, and the enclosed area of ​​the sealing member (200) is s, the unit is mm 2 , then the value range of a×b×s is 1.5~45.

2. The battery case according to claim 1, wherein The value range of a is: 70% to 99.7%; and / or, the value range of b is: 0.13 to 1.33; And / or, the value range of s is: 12.5mm 2 ~65.4mm 2 .

3. The battery case according to claim 1, wherein: The surface of the sealing member (200) away from the housing cavity is flush with the surface of the housing opening side of the housing body (100) away from the housing cavity, and the housing opening side is the side of the housing body (100) where the injection hole (101) is provided. The value range of s is: 12.5 mm 2 ~48.9mm 2 .

4. The battery case according to claim 1, wherein: Along the height direction of the shell body (100), the surface of the sealing member (200) away from the shell cavity is higher than the surface of the shell opening side of the shell body (100) away from the shell cavity, and the shell opening side is the side of the shell body (100) on which the injection hole (101) is provided. The value range of s is: 45.6 mm 2 ~65.4mm 2 .

5. The battery case according to claim 4, wherein: In the height direction of the shell body (100), the distance between the surface of the sealing member (200) away from the shell cavity and the surface of the shell opening side away from the shell cavity is L, and L is ≤ 0.15 mm.

6. The battery case according to claim 1, wherein: It also includes a sealing body (300) inserted into the channel of the liquid injection hole (101), and the sealing member (200) is farther away from the shell cavity than the sealing body (300).

7. The battery case according to claim 6, wherein: The value range of b is: 0.13~0.

56.

8. The battery case according to claim 1, wherein: The shell body (100) is used to install the battery core (400), and the battery core (400) has a winding hole (401); the injection hole (101) includes an insertion portion (1012) for extending into the winding hole (401), and the value range of b is: 0.13 to 0.

45.

9. The battery case according to claim 8, wherein: The overlapping dimension of the insertion portion (1012) and the winding core hole (401) in the axial direction is h, and the value range of h is: 0.4mm~2mm.

10. The battery case according to claim 8, wherein The step portion (1011) and the inserting portion (1012) are coaxially arranged.

11. The battery case according to claim 10, wherein: It also includes a sealing body (300) inserted into the insertion portion (1012), and the sealing element (200) is farther away from the housing cavity than the sealing body (300).

12. The battery case according to claim 1, wherein Along the radial direction of the sealing member (200), the size range of the edge of the sealing member (200) exceeding the edge of the opening of the liquid injection hole (101) is 1 mm to 4 mm.

13. The battery case according to claim 12, wherein: The sealing member (200) includes a welding area welded to the housing body (100).

14. The battery case according to claim 13, wherein: The step portion (1011) includes a bottom wall portion and a side wall portion surrounding the bottom wall portion, and the injection hole (101) is provided on the bottom wall portion; the welding area is located on the contact surface between the sealing member (200) and the bottom wall portion, and the value range of b is: 0.6 to 1.

33.

15. The battery case according to claim 13, wherein: The step portion (1011) includes a bottom wall portion and a side wall portion surrounding the bottom wall portion, and the liquid injection hole (101) is provided on the bottom wall portion; the welding area is at least partially located on the outer edge of the sealing member (200) facing the side wall portion, and the value range of s is: 45mm 2 ~65.4mm 2 .

16. The battery casing according to any one of claims 1 to 15, characterized in that: Along the radial direction, the minimum distance between the edge of the step portion (1011) and the edge of the shell body (100) ranges from 3 mm to 21.5 mm.

17. The battery casing according to any one of claims 1 to 15, characterized in that: The housing body (100) comprises a housing main body and a cover plate, at least one end of the housing main body has an opening for assembling the battery core (400), and the cover plate is arranged at the opening of the housing main body; When the liquid injection hole (101) is located in the main body of the housing, the value range of b is: 0.65 to 1.33; When the liquid injection hole (101) is located on the cover plate, the value range of b is: 0.13-0.

62.

18. The battery casing according to any one of claims 1 to 15, characterized in that: The shell body (100) is a cylindrical structure, and the injection hole (101) is coaxially arranged with the shell body (100). The value range of b is: 0.5 to 1.

33.

19. The battery casing according to any one of claims 1 to 15, characterized in that: The shell body (100) is a rectangular parallelepiped structure, and the liquid injection hole (101) is offset and arranged at the center of one side surface of the shell body (100). The value range of b is: 0.13 to 0.

5.

20. The battery casing according to any one of claims 1 to 15, characterized in that: The material of the shell body (100) further includes at least one of aluminum, vanadium, tin and molybdenum.

21. The battery casing according to any one of claims 1 to 15, wherein: The material of the sealing element (200) is titanium or titanium alloy, and the value range of b is: 0.13 to 0.

45.

22. The battery casing according to any one of claims 1 to 15, wherein: The material of the sealing element (200) is aluminum or aluminum alloy, and the value range of b is: 0.5 to 1.

33.

23. The battery casing according to any one of claims 1 to 15, wherein: The thickness b1 of the sealing member (200) has a value range of 0.1 mm to 0.4 mm; and / or, The shell wall thickness b2 of the shell body (100) on the side where the liquid injection hole (101) is provided has a value range of 0.3 mm to 0.8 mm.

24. A battery cell, characterized in that: Comprising the battery casing according to any one of claims 1-23.

25. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 24.

26. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 25.

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