Battery shell, battery and vehicle

Abstract

The utility model discloses a shell of a battery, the battery and a vehicle. The shell of the battery comprises a first cover body and a second cover body, the first side cover is connected to one side of the width direction of the first cover body, and the first side cover is bent relative to the first end cover; the second side cover is connected to the other side of the width direction of the first cover body and is arranged opposite to the first side cover, and the second side cover is bent relative to the first end cover; the anti-explosion valve is arranged on the first side cover; wherein the maximum thickness of the first cover body is D1, the maximum thickness of the first side cover is D2, the maximum thickness of the second side cover is D3, and D1, D2 and D3 meet the relational expression that D1 / D2 is larger than 0 and smaller than or equal to 1, and D2 / D3 is larger than 1 and smaller than or equal to 2. Therefore, by arranging the shell, the volume ratio of the shell can be reduced on the basis of meeting the structural strength, so that the arrangement space of the battery cell is increased, the energy density of the battery is improved, the structural strength of the shell on one side of the anti-explosion valve can be emphatically ensured, and the risk of breakage of the battery is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a casing of battery, battery and vehicle. BACKGROUND

[0002] In the secondary battery technology, lithium ion batteries have always occupied a dominant position, because they have the advantages of high energy density, lightweight and low self-discharge rate, making them the preferred energy storage solution in the fields of electric vehicles, portable electronic products and grid energy storage. With the needs of production development, researchers have been working to improve the capacity of lithium ion batteries. After the internal cell material platform and capacity performance have reached a certain level, the cell shell as a key component of the cell will greatly affect the safety, mechanical strength and energy density of the cell. In related designs, in order to pursue higher energy density and lower manufacturing cost, the cell is made larger and larger, and the internal space design is more extreme. When the volume ratio of the cell shell is large, it is difficult to obtain more space for the internal cell components, resulting in low energy density of the cell. When the volume ratio of the cell shell is small, the mechanical strength of the cell cannot be guaranteed. An effective shell design can maximize the use of space inside the battery, allowing the internal cell components to fill more active materials and improve the capacity of the cell. Starting from the cell shell, reducing the volume ratio of the shell to gain more space for the internal cell components to improve the energy density of the cell has become a technical idea to effectively improve the performance of the cell.

[0003] In related technologies, during the cell design process, in order to improve the energy density of the cell, some companies use thin aluminum / steel shells with thin thickness of the cover and side to make the cell shell, which improves the space ratio of the cell components to achieve the purpose of improving the volume energy density of the cell. However, the battery shell with thin thickness may cause the cell to deform, damage or even explode when subjected to external force impact, and has poor protection performance. On the contrary, if the thickness of the cover and side is too thick or not enough to be lightweight, it may increase the volume and weight of the cell, compressing the space of the internal cell. At the same time, if the cell shell is too thick, the thermal conductivity efficiency of the mechanical part will be greatly reduced, resulting in a decrease in the energy density of the cell and limiting its application in related fields. In summary, the existing external cell shell design cannot meet the needs of high structural strength and high energy density at the same time, and the cell has the problem of not being able to have both safety performance and electrochemical performance. SUMMARY

[0004] The utility model aims at solving one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a shell of a battery, which can reduce the volume ratio of the shell on the basis of meeting the structural strength, thereby increasing the arrangement space of the battery cell and improving the battery energy density, and can also ensure the structural strength of the shell on the side of the explosion-proof valve, thereby effectively preventing the battery from being broken.

[0005] The utility model further provides a battery.

[0006] The utility model further provides a vehicle.

[0007] According to the shell of the battery of the utility model, the first side cover is connected to one side of the width direction of the first cover body, and the first side cover is arranged to be bent relative to the first end cover, the second side cover is connected to the other side of the width direction of the first cover body and is arranged opposite to the first side cover, and the second side cover is arranged to be bent relative to the first end cover, the explosion-proof valve is arranged on the first side cover, wherein the maximum thickness of the first cover body is D1, the maximum thickness of the first side cover is D2, the maximum thickness of the second side cover is D3, D1, D2 and D3 satisfy the relationship: 0 < D1 / D2 ≤ 1, 1 < D2 / D3 ≤ 2.

[0008] Therefore, by arranging the shell, the volume ratio of the shell can be reduced on the basis of meeting the structural strength, thereby increasing the arrangement space of the battery cell and improving the battery energy density, and the structural strength of the shell on the side of the explosion-proof valve can be ensured, thereby effectively preventing the battery from being broken.

[0009] In some examples of the utility model, D2 satisfies the relationship: 0.01mm ≤ D2 ≤ 2mm.

[0010] In some examples of the utility model, D1 satisfies the relationship: 0.01mm ≤ D1 ≤ 2mm.

[0011] In some examples of the utility model, the shell of the battery further comprises: a second cover body arranged opposite to the first cover body, the first side cover and the second side cover are connected to the two sides of the width direction of the second cover body respectively, the maximum thickness of the second cover body is D4, and D1 and D4 satisfy the relationship: 1 ≤ D1 / D4 ≤ 2.

[0012] In some examples of the utility model, D4 satisfies the relationship: 0.01mm ≤ D4 ≤ 2mm.

[0013] In some examples of the utility model, the first cover body, the first side cover, the second cover body and the second side cover are connected head to tail and jointly define a containing cavity for containing the battery cell, the containing cavity has a first opening and a second opening at both ends of the length direction of the first cover body, the shell further comprises: a first end cover, the first end cover is arranged at the first opening; a second end cover, the second end cover is arranged at the second opening.

[0014] In some examples of the utility model, the length of the first cover body is L, L satisfies the relationship: 600mm≤L≤2500mm.

[0015] In some examples of the utility model, the height of the first side cover is D, D satisfies the relationship: 40mm≤D≤100mm.

[0016] In some examples of the utility model, the shell of the battery further comprises: an explosion-proof sheet, the explosion-proof sheet is arranged on the first side cover, and the explosion-proof sheet is located on the side of the explosion-proof valve away from the second side cover.

[0017] In some examples of the utility model, the projection area of the explosion-proof valve is greater than the projection area of the explosion-proof sheet in the surface projection of the first side cover along the thickness direction of the explosion-proof sheet.

[0018] In some examples of the utility model, the thickness of the explosion-proof sheet is H1, the thickness of the explosion-proof valve is H2, H1, H2 and D2 satisfy the relationship: H1

[0019] In some examples of the utility model, the explosion-proof sheet and the first side cover are an integrally formed metal structure cover.

[0020] According to the second aspect of the utility model, the battery comprises: the shell of the battery described above; and a battery cell arranged in the shell.

[0021] In some examples of the utility model, the outer surface area of the shell is S, the energy of the battery is E, S and E satisfy the relationship: 0.005Wh / mm²≤E / S≤0.05Wh / mm².

[0022] In some examples of the utility model, the volume of the battery is V, the length of the shell is L, V and L satisfy the relationship: 0.001mm -2 ≤L / V≤0.0025mm -2 .

[0023] In some examples of this utility model, the volumetric energy density of the battery is VED, which satisfies the relationship: 200Wh / L≤VED≤500Wh / L; and / or the gravimetric energy density of the battery is WED, which satisfies the relationship: 50Wh / kg≤WED≤200Wh / kg.

[0024] The vehicle according to a third aspect of this utility model includes: the battery described above.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is an exploded view of a battery according to an embodiment of the present utility model;

[0028] Figure 2 This is a partial structural schematic diagram of the shell according to an embodiment of the present utility model;

[0029] Figure 3 This is a cross-sectional view of the housing according to an embodiment of the present utility model;

[0030] Figure 4 yes Figure 3 Enlarged view of region A in the middle;

[0031] Figure 5 This is a cross-sectional view of the second side cover according to an embodiment of the present utility model.

[0032] Figure label:

[0033] 100. Casing; 200. Battery; 201. Cell;

[0034] 1. First cover; 11. Receiving cavity; 111. First opening;

[0035] 2. First side cover; 3. Second side cover; 4. Explosion-proof valve; 41. Explosion-proof plate;

[0036] 5. Second cover; 6. First end cover; 7. Second end cover. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0038] The following is for reference. Figures 1-5The battery 200 according to the present invention has a housing 100 that, while meeting structural strength requirements, can also reduce the volume ratio of the housing 100, thereby increasing the arrangement space of the battery cell 201, improving the energy density of the battery 200, and can also focus on ensuring the structural strength of the housing 100 on the side of the explosion-proof valve 4, thereby effectively preventing the risk of battery 200 rupture.

[0039] Combination Figures 1-5 As shown, the battery 200 according to the first aspect embodiment of the present invention includes a first cover 1, a first side cover 2, a second side cover 3, and an explosion-proof valve 4. The first cover 1, the first side cover 2, and the second side cover 3 constitute the main load-bearing structural components of the battery 200, which together provide structural protection and support for the internal battery cell 201, thereby improving the safety of the battery cell 201. The explosion-proof valve 4 ensures that the battery 200 will not explode due to excessive internal pressure during use (when too much gas is generated inside the battery 200, this gas will cause the internal pressure of the battery 200 to rise. If the pressure exceeds the safety limit that the battery 200 casing 100 can withstand, it may rupture or explode. The explosion-proof valve 4 is designed to automatically open in this situation to release excess pressure. By timely venting the gas accumulated inside the casing 100, the explosion-proof valve 4 can significantly reduce the safety risks caused by physical damage or uncontrolled chemical reactions).

[0040] Specifically, the first side cover 2 is connected to one side of the width direction of the first cover body 1, and the first side cover 2 is bent relative to the first side cover 2. The second side cover 3 is connected to the other side of the width direction of the first cover body 1, and the second side cover 3 is opposite to the first side cover 2, and the second side cover 3 is bent relative to the first side cover 2. The explosion-proof valve 4 is disposed on the first side cover 2.

[0041] Specifically, the first side cover 2 and the second side cover 3 are respectively bent and connected to both sides of the first cover body 1 in the width direction. Moreover, the first side cover 2 and the second side cover 3 are correspondingly spaced in the width direction of the first cover body 1. The three are connected to each other as a whole, which can improve each other's weight and spatial mode, thereby improving the overall structural strength and bending and torsional stiffness, and improving structural reliability.

[0042] The surface area of ​​the first cover 1 (such as the top cover of the battery 200) can be larger than the surface area of ​​the first side cover 2 (and also larger than the surface area of ​​the second side cover 3). The explosion-proof valve 4 (when a single cell 201 is in use, gas production often occurs. Since the cell 201 itself is a closed shell, when a large amount of gas is produced, the shell of the cell 201 will bulge and there is nowhere to release the gas. As the service life of the single cell 201 increases, the amount of gas produced inside will gradually increase and the internal gas pressure will increase accordingly. In order to avoid dangerous situations such as explosion of the cell 201, an explosion-proof valve 4 is usually installed on the cell 201) is set on the first side cover 2. In this way, when the battery 200 encounters an abnormal situation and needs to release pressure, it can avoid affecting the key components on the top of the battery 200 (such as the positive and negative terminals and other electrical connection parts). Moreover, since the top cover is usually a flat and large surface, if the explosion-proof valve 4 is set here, once it is opened, it may cause the top cover to deform, affecting the overall structural stability of the battery 200, thereby improving its spatial arrangement rationality.

[0043] Compared to the traditional battery explosion-proof valve design (which is generally installed on the battery cell housing, and current battery cell designs tend to be thinner and longer, opening the explosion-proof valve mounting hole on the narrow side of the housing will greatly reduce the rigidity of the narrow side of the battery cell housing. When the internal pressure of the battery cell increases, the battery cell will undergo slight deformation, which will lead to damage to the battery cell housing, detachment of the explosion-proof valve, and serious impact on the safety of the battery cell), the embodiment in this case can focus on strengthening the structural strength of the housing 100 on the side of the explosion-proof valve 4, thereby ensuring the normal pressure relief operation of the explosion-proof valve 4.

[0044] Specifically, the maximum thickness of the first cover 1 is D1, the maximum thickness of the first side cover 2 is D2, and the maximum thickness of the second side cover 3 is D3. D1, D2, and D3 satisfy the following relationship: 0 < D1 / D2 ≤ 1, 1 < D2 / D3 ≤ 2. For example, D1 / D2 can be 0.1, 0.5, 0.8, and 1, etc., and is not limited to these values; D2 / D3 can be 1.1, 1.3, 1.5, and 2, etc., and is not limited to these values.

[0045] The maximum thickness of the first side cover 2 can be equal to the maximum thickness of the first cover 1; the maximum thickness of the first side cover 2 can also be greater than the maximum thickness of the first cover 1. This ensures the thickness of the housing 100 on the side of the explosion-proof valve 4, effectively reducing the risk of the battery 200 exploding due to insufficient thickness of the housing 100 on the explosion-proof valve 4 side. It also effectively reduces material consumption of the first cover 1 while maintaining its structural strength, lowering manufacturing costs. Furthermore, it increases the volume ratio of the battery cell 201 within the housing 100, improving the energy density of the battery 200. This allows the heat dissipated by the battery 200 to be conducted to the outside in a timely manner through the thinner first cover 1, effectively improving the heat dissipation effect of the battery cell 201 (since the heat dissipation of the battery cell 201 is mainly through the large surface of the housing 100, such as the first cover 1), thereby improving the heat dissipation efficiency of the battery 200; and since the maximum thickness of the first side cover 2 is relatively large, it can provide a larger contact area and connection area, which is beneficial to the welding work, thereby enhancing the bonding force between the first side cover 2 and the first cover 1, reducing the risk of the explosion-proof valve 4 loosening or falling off, ensuring that the explosion-proof valve 4 can always work effectively, and improving the overall durability and reliability of the battery cell 201.

[0046] In addition, the maximum thickness of the first side cover 2 can be equal to the maximum thickness of the second side cover 3; the maximum thickness of the first side cover 2 can also be greater than the maximum thickness of the second side cover 3. This can reduce the material consumption of the second side cover 3, reduce the production cost, and increase the volume ratio of the battery cell 201 inside the casing 100, thereby maximizing the arrangement space of the battery cell 201 inside the casing 100 and increasing the energy density of the battery 200.

[0047] Furthermore, an explosion-proof valve 4 is provided on the first side cover 2. The first side cover 2 is relatively thick, which can meet the weld strength requirements of the long and thin shell 100, making the weld strength greater than the pressure relief pressure at the explosion-proof valve 4. This ensures that the explosion-proof valve 4 releases pressure before the shell 100 explodes, thereby improving the stability and safety of the battery 200.

[0048] In summary, by using the above arrangement to limit the thickness ratio of the first cover 1 and the second cover 3 based on the thickness of the first side cover 2 on one side of the explosion-proof valve 4, its thermal conductivity can be improved, effectively dissipating the heat generated inside the battery cell 201. This improves the mechanical strength and impact resistance of the battery cell 201 while also achieving a higher energy density. Secondly, by increasing the thickness of the housing 100 on the side of the explosion-proof valve 4, the effective operation of the explosion-proof valve 4 can be ensured.

[0049] Therefore, by setting up the housing 100, the volume ratio of the housing 100 can be reduced while meeting the structural strength requirements, thereby increasing the arrangement space of the battery cell 201, improving the energy density of the battery 200, and ensuring the structural strength of the housing 100 on the side of the explosion-proof valve 4, thus effectively preventing the risk of battery 200 rupture.

[0050] According to some optional embodiments of the present invention, combined with Figure 1 and Figure 4 As shown, D2 satisfies the relationship: 0.01mm ≤ D2 ≤ 2mm. This ensures that the maximum thickness of the first side cover 2 remains within a suitable range. When the maximum thickness of the first side cover 2 is less than 0.01mm, its basic protective effect is poor. When the maximum thickness of the first side cover 2 is greater than 2mm, it occupies too much space, reducing the space ratio of the battery cell 201 inside the casing 100, which is detrimental to improving the energy density of the battery cell 201. Therefore, the embodiment in this case can simultaneously guarantee the structural strength of the casing 100 and the energy density of the battery 200. For example, D2 can be 0.01mm, 0.05mm, 0.1mm, 1mm, and 2mm, and is not limited to these.

[0051] According to some optional embodiments of the present invention, combined with Figure 1 As shown, D1 satisfies the relationship: 0.01mm ≤ D1 ≤ 2mm. This ensures that the maximum thickness of the first cover 1 remains within a suitable range. When the maximum thickness of the first cover 1 is less than 0.01mm, its basic protective effect is poor. When the maximum thickness of the first cover 1 is greater than 2mm, it occupies too much space, reducing the space ratio of the battery cell 201 inside the casing 100, which is detrimental to improving the energy density of the battery cell 201. Therefore, the embodiment in this case can simultaneously consider the structural strength of the casing 100 and the energy density of the battery 200. For example, D1 can be 0.01mm, 0.05mm, 0.1mm, 1mm, and 2mm, and is not limited to these.

[0052] According to some optional embodiments of the present invention, combined with Figure 1-3 As shown, the housing 100 also includes a second cover 5, which is disposed opposite to the first cover 1. The first side cover 2 and the second side cover 3 are respectively connected to the two sides of the second cover 5 in the width direction. The maximum thickness of the second cover 5 is D4, and D1 and D4 satisfy the relationship: 1≤D1 / D4≤2. For example, D1 / D4 can be 1, 1.5, 1.8 and 2, etc., and is not limited thereto.

[0053] For example, when the battery 200 is laid flat, that is, the surface with the largest surface area (such as the surface of the first cover 1 and the second cover 5) is parallel to the lying surface, the first cover 1 and the second cover 5 are arranged opposite to each other, and the first side cover 2 and the second side cover 3 are respectively connected between the first cover 1 and the second cover 5. The four are connected to each other to form a closed force-bearing structural frame. In this way, the forces they are subjected to can be distributed to each other, reducing the risk of deformation and thus ensuring the structural stability of the shell 100.

[0054] The thickness of the first cover 1 can be equal to the thickness of the second cover 5, which improves the manufacturing consistency and efficiency. Alternatively, the thickness of the first cover 1 can be greater than the thickness of the second cover 5. This ensures the structural strength of the casing 100 in the thickness direction of the first cover 1 while reducing the material consumption of the second cover 5, thus reducing its volume fraction. This increases the space ratio of the battery cell 201 within the casing 100, improving its energy density, and simultaneously balancing the structural strength of the casing 100 and the energy density of the battery 200.

[0055] Specifically, in combination Figure 1-3 As shown, D4 satisfies the relationship: 0.01mm ≤ D4 ≤ 2mm. This design allows the maximum thickness of the second cover 5 to be kept within a suitable range. When the maximum thickness of the second cover 5 is less than 0.01mm, the basic protective effect of the second cover 5 is poor. When the maximum thickness of the second cover 5 is greater than 2mm, the second cover 5 will occupy too much space, thereby reducing the space ratio of the battery cell 201 inside the casing 100, which is not conducive to improving the energy density of the battery cell 201. Therefore, the embodiment in this case can simultaneously take into account the structural strength of the casing 100 and the energy density of the battery 200. For example, D4 ​​can be 0.01mm, 0.05mm, 0.1mm, 1mm, and 2mm, and is not limited to these.

[0056] Furthermore, combined Figures 1-2 As shown, the first cover 1, the first side cover 2, the second cover 5 and the second side cover 3 are connected end to end and together define a receiving cavity 11 for accommodating the battery cell 201. The receiving cavity 11 has a first opening 111 and a second opening at both ends of the length direction of the first cover 1.

[0057] It is understandable that the first cover 1, the first side cover 2, the second cover 5, and the second side cover 3 are connected end to end to form a closed force-bearing structure, which can improve the overall structural stability. Moreover, the above four components together define the receiving cavity 11, which can provide installation space for the battery cell 201. The first opening 111 and the second opening can facilitate the operator to take out the battery cell 201 inside the housing 100, thereby improving the efficiency of battery cell 201 installation, removal, and replacement.

[0058] Optionally, the connection between the first cover 1, the first side cover 2, the second cover 5 and the second side cover 3 is a splicing connection, and the splicing point is at least one of a straight edge, a beveled edge or a grooved edge, and the splicing position is located at the straight edge or the bend of the shell 100.

[0059] Furthermore, combining Figure 1 As shown, the housing 100 also includes a first end cap 6 and a second end cap 7. The first end cap 6 is disposed at the first opening 111, and the second end cap 7 is disposed at the second opening. The first end cap 6 primarily serves to cover the first opening 111 and the second opening, thus ensuring the housing 100's sealing effect on the battery cell 201, preventing external moisture, dust, and other contaminants from entering the battery 200, and also preventing electrolyte leakage. This protects the internal components of the battery 200 from environmental influences, thereby improving the safety of the battery 200.

[0060] The first side cover 2 and the second side cover 3 are both larger than the surface area of ​​the first end cover 6 or the second end cover 7.

[0061] According to some optional embodiments of the present invention, combined with Figure 1 and Figure 3 As shown, the length of the first cover 1 is L, which satisfies the relationship: 600mm ≤ L ≤ 2500mm. This makes the length of the first cover 1 relatively large, providing more space for the battery cell 201 in the length direction, thereby increasing the energy density of the battery cell 201. For example, the length L of the first cover 1 can be 600mm, 800mm, 1000mm, 1500mm, and 2500mm, etc., and is not limited to these.

[0062] According to some optional embodiments of the present invention, combined with Figures 1-3 As shown, the height of the first side cover 2 is D, where D satisfies the relationship: 40mm ≤ D ≤ 100mm. This allows the casing 100 to be thinner, which is beneficial for the elongated and thinner design of the casing 100. This makes it easier for the battery 200 to adapt to the space requirements of narrow or specific shapes, and also facilitates parallel or series connection to form a modular power system. It also increases the heat dissipation area, which is beneficial for improving the efficiency of natural convection heat dissipation, keeping the operating temperature of the battery 200 within a suitable range as much as possible, and reducing hot spot accumulation. Compared with cylindrical or other shaped batteries 200, the elongated and thinner design allows for a more uniform heat distribution on the casing 100, avoiding local overheating, thereby extending the battery 200's lifespan and improving safety. For example, the height D of the first side cover 2 can be 40mm, 50mm, 60mm, 80mm, and 100mm, and is not limited to these values.

[0063] According to some optional embodiments of the present invention, combined with Figure 1, Figure 2 and Figure 4 As shown, the housing 100 also includes an explosion-proof plate 41, which is disposed on the first side cover 2 and is located on the side of the explosion-proof valve 4 away from the second side cover 3.

[0064] Among them, the explosion-proof plate 41 can share the pressure relief task of the explosion-proof valve 4. When the internal pressure of the housing 100 reaches a certain threshold, the explosion-proof valve 4 will first perform initial pressure relief. If the pressure continues to rise, the explosion-proof plate 41 will open further to increase the pressure relief speed and provide additional safety protection. In this way, by setting two pressure relief points, it can be activated at different pressure levels to ensure the safety of the battery 200.

[0065] Specifically, in combination Figure 1 , Figure 2 and Figure 4 As shown, along the thickness direction of the explosion-proof disc 41, the projected area of ​​the explosion-proof valve 4 is larger than that of the explosion-proof disc 41. With this arrangement, when the pressure inside the housing 100 begins to rise, it can be ensured that the explosion-proof valve 4 can respond first and start the pressure relief process, and can release pressure earlier and faster, thereby providing a buffer time for the explosion-proof disc 41 that may need to be opened later. Moreover, the larger area of ​​the explosion-proof valve 4 can distribute the pressure more evenly, avoid the formation of excessive local stress near the explosion-proof disc 41, reduce the risk of accidental triggering of the explosion-proof disc 41, and thus improve the opening accuracy of the explosion-proof disc 41.

[0066] Furthermore, combined Figure 1 As shown, the thickness of the explosion-proof sheet 41 is H1, and the thickness of the explosion-proof valve 4 is H2. H1, H2, and D2 satisfy the following relationships: H1 < D2, 0.01mm ≤ H1 ≤ 2mm, and H2 < D2. For example, the thickness H1 of the explosion-proof sheet 41 can be 0.01mm, 0.05mm, 0.1mm, 1mm, and 2mm, etc., and is not limited to these.

[0067] Since the thickness of the explosion-proof sheet 41 and the explosion-proof valve 4 is less than the thickness of the first side cover 2, the first side cover 2 forms a weak stress area in the explosion-proof sheet 41 and the explosion-proof valve 4. Thus, when the battery cell 201 inside the housing 100 experiences thermal runaway, gas can be preferentially discharged from the explosion-proof sheet 41 and the explosion-proof valve 4 of the first side cover 2 to release pressure, thereby ensuring the safety of the battery cell 201.

[0068] Specifically, the explosion-proof plate 41 and the first side cover 2 are integrally formed metal structural covers. This arrangement can reduce the number of parts and assembly time, thereby reducing assembly steps, lowering manufacturing costs, and improving production efficiency. It can also avoid the fitting errors that may occur in traditional multi-part assembly, thereby improving the precision and consistency of the product. It can also reduce stress concentration points (due to the absence of seams and welds), thereby improving the overall structural strength and rigidity of the inner shell 100, and thus improving the structural reliability of the shell 100. Moreover, since the explosion-proof plate 41 and the first side cover 2 are metal structural components, metal has the characteristics of high structural strength, high rigidity, and wear resistance, which can effectively extend the service life.

[0069] Optionally, the explosion-proof sheet 41 is circular, elliptical, or rectangular in shape; the explosion-proof sheet 41 is formed by stamping or cutting; the shell 100 is made of metal, which can be aluminum, copper, iron, zinc, or alloys, etc., and is not limited thereto.

[0070] Combination Figure 1 As shown, the battery 200 according to the second aspect of the present invention includes the housing 100 and the battery cell 201 of the battery 200 described above. The battery cell 201 is disposed inside the housing 100. Thus, the battery 200 with the housing 100 can reduce the volume ratio of the housing 100 while meeting the structural strength requirements, thereby increasing the arrangement space of the battery cell 201, improving the energy density of the battery 200, and also ensuring the structural strength of the housing 100 on the side of the explosion-proof valve 4, thereby effectively preventing the risk of deformation and breakage of the battery 200.

[0071] According to some optional embodiments of this utility model, the outer surface area of ​​the casing 100 is S, and the energy of the battery 200 is E. S and E satisfy the relationship: 0.005Wh / mm² ≤ E / S ≤ 0.05Wh / mm². For example, E / S can be 0.005Wh / mm², 0.01Wh / mm², 0.02Wh / mm², 0.03Wh / mm², and 0.005Wh / mm², etc., and is not limited thereto.

[0072] Specifically, by limiting the above relationship within a reasonable range, excessively high energy density can be avoided. If E / S exceeds the upper limit of 0.05 Wh / mm², it means that there is too much energy per unit area, which may lead to poor heat dissipation, increase the internal temperature of battery 200, and thus affect the life of battery 200 and bring safety hazards. On the other hand, if E / S is below the lower limit of 0.005 Wh / mm², it means that the energy density of battery 200 is low, which may lead to excessive device size or the need for frequent charging, affecting the user experience. The design range in this case can ensure that battery 200 can effectively dissipate heat during operation and maintain a suitable operating temperature, thereby improving the stability and reliability of the entire battery 200 system.

[0073] According to some optional embodiments of this utility model, the volume of the battery 200 is V, and the length of the casing 100 is L. V and L satisfy the relationship: 0.001mm-2≤L / V≤0.0025mm-2. For example, L / V can be 0.001mm-2, 0.0015mm-2, and 0.0025mm-2, etc., and is not limited thereto.

[0074] Furthermore, by controlling the L / V ratio within a reasonable range, it is possible to ensure that the internal components of the casing 100 (such as the battery cell 201, circuit board, etc.) can be arranged compactly, maximizing the use of limited space. This also helps to improve the heat dissipation efficiency of the battery 200. A longer battery 200 can better distribute heat along its length, reducing local overheating and avoiding the risk of overheating. If the L / V is too small, it means that the battery 200 is too short and thick, which may cause heat to concentrate in a small area, increasing the risk of overheating.

[0075] According to some optional embodiments of this utility model, the volumetric energy density of the battery 200 is VED, which satisfies the relationship: 200Wh / L ≤ VED ≤ 500Wh / L. For example, VED can be 200Wh / L, 300Wh / L, 400Wh / L, and 500Wh / L, etc., and is not limited thereto. By controlling VED within a reasonable range, the size and weight of the battery 200 can be reduced, and the battery's range can be improved, thereby enhancing the user experience.

[0076] Optionally, the gravimetric energy density of battery 200 is WED, where WED satisfies the relationship: 50Wh / kg ≤ WED ≤ 200Wh / kg. For example, WED can be 50Wh / kg, 80Wh / kg, 100Wh / kg, 150Wh / kg, and 200Wh / kg, etc., and is not limited to these. By controlling WED within a reasonable range, the weight of battery 200 can be reduced, and its battery life can be improved, thereby enhancing the user experience.

[0077] According to the third aspect of the present invention, the vehicle includes the battery 200 of the above embodiment. Thus, the vehicle having the battery 200 can, while satisfying the structural strength of the housing 100 of the battery 200, reduce the volume ratio of the housing 100, thereby increasing the arrangement space of the battery cells 201, improving the energy density of the battery 200, and also focusing on ensuring the structural strength of the housing 100 on the side of the explosion-proof valve 4, thereby effectively preventing the risk of battery 200 rupture, and thus enhancing the market competitiveness of the vehicle.

[0078] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0079] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0081] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing (100) for a battery (200), characterized in that, include: First cover (1); The first side cover (2) is connected to one side of the width direction of the first cover body (1), and the first side cover (2) is bent relative to the first cover body (1); The second side cover (3) is connected to the other side of the width direction of the first cover (1) and is disposed opposite to the first side cover (2). The second side cover (3) is bent relative to the first cover (1). Explosion-proof valve (4), the explosion-proof valve (4) is disposed on the first side cover (2); The maximum thickness of the first cover (1) is D1, the maximum thickness of the first side cover (2) is D2, and the maximum thickness of the second side cover (3) is D3. D1, D2 and D3 satisfy the following relationship: 0 < D1 / D2 ≤ 1, 1 < D2 / D3 ≤ 2.

2. The casing (100) of the battery (200) according to claim 1, characterized in that, The D2 satisfies the relationship: 0.01mm≤D2≤2mm.

3. The casing (100) of the battery (200) according to claim 1, characterized in that, The D1 satisfies the following relationship: 0.01mm≤D1≤2mm.

4. The casing (100) of the battery (200) according to claim 1, characterized in that, Also includes: The second cover (5) is disposed opposite to the first cover (1). The first side cover (2) and the second side cover (3) are respectively connected to the two sides of the width direction of the second cover (5). The maximum thickness of the second cover (5) is D4. D1 and D4 satisfy the relationship: 1≤D1 / D4≤2.

5. The casing (100) of the battery (200) according to claim 4, characterized in that, D4 satisfies the relationship: 0.01mm≤D4≤2mm.

6. The casing (100) of the battery (200) according to claim 4, characterized in that, The first cover (1), the first side cover (2), the second cover (5) and the second side cover (3) are connected end to end and together define a receiving cavity (11) for accommodating the battery cell (201). The receiving cavity (11) has a first opening (111) and a second opening at both ends of the length direction of the first cover (1). The housing (100) further includes: First end cap (6), the first end cap (6) is disposed at the first opening (111); The second end cap (7) is disposed at the second opening.

7. The casing (100) of the battery (200) according to claim 1, characterized in that, The length of the first cover (1) is L, and L satisfies the relationship: 600mm≤L≤2500mm.

8. The casing (100) of the battery (200) according to claim 1, characterized in that, The height of the first side cover (2) is D, and D satisfies the relationship: 40mm≤D≤100mm.

9. The casing (100) of the battery (200) according to claim 1, characterized in that, Also includes: An explosion-proof plate (41) is disposed on the first side cover (2), and the explosion-proof plate (41) is located on the side of the explosion-proof valve (4) away from the second side cover (3).

10. The casing (100) of the battery (200) according to claim 9, characterized in that, Projecting the explosion-proof sheet (41) onto the surface of the first side cover (2) along the thickness direction, the projected area of ​​the explosion-proof valve (4) is greater than the projected area of ​​the explosion-proof sheet (41).

11. The casing (100) of the battery (200) according to claim 9, characterized in that, The thickness of the explosion-proof sheet (41) is H1, and the thickness of the explosion-proof valve (4) is H2. H1, H2 and D2 satisfy the following relationship: H1 < D2, 0.01 ≤ H1 ≤ 2 mm, H2 < D2.

12. The casing (100) of the battery (200) according to claim 9, characterized in that, The explosion-proof sheet (41) and the first side cover (2) are integrally formed metal structure covers.

13. A battery (200), characterized in that, include: The casing (100) of the battery (200) according to any one of claims 1-12; The battery cell (201) is disposed within the housing (100).

14. The battery (200) according to claim 13, characterized in that, The outer surface area of ​​the casing (100) is S, and the energy of the battery (200) is E. S and E satisfy the relationship: 0.005Wh / mm²≤E / S≤0.05Wh / mm².

15. The battery (200) according to claim 13, characterized in that, The volume of the battery (200) is V, and the length of the casing (100) is L. V and L satisfy the relationship: 0.001 mm. -2 ≤L / V≤0.0025mm -2 .

16. The battery (200) according to claim 13, characterized in that, The volumetric energy density of the battery (200) is VED, which satisfies the following relationship: 200Wh / L≤VED≤500Wh / L; and / or The weight energy density of the battery (200) is WED, and WED satisfies the following relationship: 50Wh / kg≤WED≤200Wh / kg.

17. A vehicle, characterized in that, include: The battery (200) according to any one of claims 13-16.

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