Battery case and battery pack

Abstract

The application provides a battery shell and a battery pack, which are buckled on a box body of the battery pack to form a containing cavity containing battery cells. The battery shell comprises a shell body, a first buffer and a second buffer. The first buffer and the second buffer are connected with the shell body. The first buffer is arranged on a side of the shell body away from the box body, and the second buffer is arranged on a side of the shell body close to the box body. In the thickness direction of the shell body, the projections of the first buffer and the second buffer at least partially coincide. By arranging the first buffer and the second buffer on the two sides of the shell body, when the battery pack is subjected to an external force, the first buffer and the second buffer can slow down the shaking of the shell body due to the arrangement of the first buffer and the second buffer, thereby playing a protective effect on the shell body, reducing the probability of the shell body being broken due to impact, and improving the stability of the battery shell.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery casing and battery pack. Background Technology

[0002] With the rapid development of my country's new energy sector, especially in the field of new energy vehicles, the battery pack of a new energy vehicle is typically located under the vehicle's floor. The battery pack casing abuts against the floor, and the cells and other components inside the battery pack are also in contact with the casing. However, when the battery pack at the bottom of the vehicle is subjected to external force, the battery casing may collide with the floor and the battery cells. The battery casing may crack due to the impact, resulting in poor structural stability. Summary of the Invention

[0003] In view of this, this application provides a battery casing that at least solves the problem of poor structural stability of the battery casing caused by cracking due to external forces. This application also provides a battery pack including the above-described battery casing.

[0004] To achieve the above objectives, this application provides the following technical solution: A battery casing, which is fastened to the housing of a battery pack to form a receiving cavity for accommodating battery cells, the battery casing comprising: Shell body; Both the first buffer and the second buffer are connected to the housing body. The first buffer is located on the side of the housing body away from the box, and the second buffer is located on the side of the housing body close to the box. In the thickness direction of the housing body, the projections of the first buffer and the second buffer at least partially overlap.

[0005] Optionally, in the thickness direction of the housing body, the projection of the first buffer member is completely located within the second buffer member.

[0006] Optionally, the cross-sectional area of ​​the first buffer is S1, and the cross-sectional area of ​​the second buffer is S2, wherein S1 and S2 satisfy the following condition: 1≥S1 / S2≥0.7.

[0007] Optionally, multiple first and second buffers are provided, with multiple first buffers evenly arranged in the length and / or width direction of the housing body, and multiple second buffers evenly arranged.

[0008] Optionally, in the direction of the housing body away from the box body, a first rib is stamped on the end face of the housing body away from the box body; and multiple first ribs are provided, and multiple first ribs are spaced apart in the length direction and / or width direction of the housing body.

[0009] Optionally, in the thickness direction of the housing body, the first buffer and the second buffer are respectively disposed on both sides of the protruding end face of the first rib.

[0010] Optionally, the minimum distance between the first rib and the edge of the end face of the housing body where the first rib is set is K, and the thickness of the housing body is T, wherein K and T satisfy: 3×T≤K.

[0011] Optionally, the first rib is a strip-shaped protrusion that undergoes multiple bends.

[0012] Optionally, the housing body includes a linear protrusion located in the middle of the housing body and disposed along the length direction of the housing body. The linear protrusion includes a protruding end and a first inclined portion and a second inclined portion located on both sides of the protruding end, wherein: In the width direction of the linear protrusion, the width of the linear protrusion is A, and the width of the end of the protrusion is B; in the inclination direction of the first inclined portion, the dimension of the first inclined portion is C; in the inclination direction of the second inclined portion, the dimension of the second inclined portion is D; wherein A, B, C and D satisfy: 1 ​​< (B + C + D) / A ≤ 1.38.

[0013] Optionally, the initial compression ratio of both the first buffer and the second buffer is 10% to 20%.

[0014] Optional, The housing body includes an annular connecting portion for connecting with the box body, and a second rib is stamped on the annular connecting portion in the direction away from the box body of the housing body; In the circumferential direction of the housing body, a plurality of connecting holes are provided on the annular connecting portion, and a plurality of second protruding ribs are provided, with the second protruding ribs being disposed between adjacent connecting holes.

[0015] Optionally, the distance L1 between adjacent connecting holes, the width of the portion of the annular connecting part where the connecting holes are opened is L2, the length of the second rib is L3, and the width of the second rib is L4, wherein L1, L2, L3 and L4 satisfy the following condition: 1 > (L3 × L4) / (L1 × L2) > 0.3.

[0016] Optionally, the housing body includes a flanged portion connected to the annular connecting portion. In the extending direction of the flanged portion, the flanged portion includes an arc-shaped portion and an extension portion that are sequentially arranged and integrally formed, wherein: The radius of the arc-shaped part is R, and the thickness of the flange is t; in the extension direction of the flange, the dimension of the flange is L, and the dimension of the extension is S; wherein R, L, and S satisfy the following relationship: L = R + S, R ≥ 2t.

[0017] A battery pack comprising a battery housing as described in any of the preceding claims.

[0018] The battery casing provided in this application is fastened to the casing of a battery pack to form a cavity for accommodating battery cells. The battery casing includes a casing body, a first buffer member, and a second buffer member. Both the first and second buffer members are connected to the casing body. The first buffer member is located on the side of the casing body away from the casing, and the second buffer member is located on the side of the casing body closer to the casing. Here, by providing the first and second buffer members on both sides of the casing body respectively, when the battery pack is subjected to external force, the first and second buffer members can reduce the shaking of the casing body, thereby protecting the casing body and reducing the probability of the casing body breaking due to impact, thus improving the stability of the battery casing.

[0019] Furthermore, in the thickness direction of the housing body, the projections of the first and second buffer members at least partially overlap. Thus, when the area of ​​the housing body where the first buffer member is located is subjected to a force from the vehicle floor towards the housing body, the second buffer member, which partially overlaps with the first buffer member on the other side of the housing body, can contract to buffer the bending of the housing body towards the battery pack's receiving cavity. Conversely, when the area of ​​the housing body where the second buffer member is located is subjected to a force from the housing body towards the vehicle floor, the first buffer member, which partially overlaps with the second buffer member on the other side of the housing body, can contract to buffer the bending of the housing body away from the battery pack's receiving cavity. In summary, through the above-described arrangement, the housing body can be further protected, and the structural stability of the housing body can be further improved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1An exploded view of the battery casing provided in an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the shell body.

[0023] Figure 3 This is a schematic diagram of the structure of the first and second buffer components.

[0024] Figure 4 This is a schematic diagram of the battery casing.

[0025] Figure 5 for Figure 4 Enlarged view of point P in the middle.

[0026] Figure 6 This is a top view of the shell body.

[0027] Figure 7 for Figure 6 Cross-sectional view at point TT.

[0028] Figure 8 This is a structural diagram of the annular connecting part and the flanged part.

[0029] exist Figures 1-8 middle: 1-Shell body, 2-First buffer, 3-Second buffer, 4-First rib, 5-Linear protrusion, 6-Annular connecting part, 7-Connecting hole, 8-Second rib, 9-Flanged part; 51-Protruding end, 52-First inclined portion, 53-Second inclined portion, 61-Linear segment, 62-Arched segment, 91-Arched portion, 92-Extension portion. Detailed Implementation

[0030] This application provides a battery casing that at least solves the problem of poor structural stability caused by the battery casing cracking due to external forces. This application also provides a battery pack including the aforementioned battery casing.

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The battery casing is fastened to the battery pack housing to form a cavity for accommodating the battery cells. The battery casing is connected to the housing to seal the housing, thereby forming the cavity. The cavity provides installation positions for multiple battery cells. The battery cell is the main part of the battery pack that undergoes charging and discharging reactions. The battery cell typically includes a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. The battery cell can be formed by winding the positive electrode, negative electrode, and separator together to form a wound battery cell. Alternatively, the battery cell can be formed by stacking the positive electrode, negative electrode, and separator together to form a stacked battery cell.

[0033] like Figures 1 to 8 As shown in the illustration, this application provides a battery casing, which mainly includes a casing body 1, a first buffer 2, and a second buffer 3. The casing body 1 is the main structure of the battery casing. The first buffer 2 and the second buffer 3 are both connected to the casing body 1, that is, the first buffer 2 and the second buffer 3 are respectively disposed on both sides of the casing body 1. Specifically, the first buffer 2 is disposed on the side of the casing body 1 away from the housing, and the second buffer 3 is disposed on the side of the casing body 1 close to the housing. Specifically, when the bottom plate is subjected to a force toward the battery casing, since the first buffer 2 is disposed on the side of the casing body 1 away from the housing, the first buffer 2 will shrink when the bottom plate is subjected to a force toward the casing body 1, thereby reducing the impact between the casing body 1 and the bottom plate, thus protecting the casing body 1. Correspondingly, when a cell inside the battery pack is subjected to a force toward the side of the housing body 1, the second buffer 3, located on the side of the housing body 1 facing the casing, will contract when the cell is subjected to a force toward the housing body 1. This will reduce the impact between the housing body 1 and the cell, thus protecting the housing body 1. In summary, by providing a first buffer 2 and a second buffer 3 on both sides of the housing body 1, when the housing body 1 is subjected to an external force that tends to contact the base plate or the cell, the first buffer 2 and the second buffer 3 will contract to offset the external force, thereby reducing or even preventing collisions between the housing body 1 and the base plate, and between the housing body 1 and the cell, thus protecting the housing body 1.

[0034] In this embodiment, the projections of the first buffer member 2 and the second buffer member 3 at least partially overlap in the thickness direction of the housing body 1. That is, the first buffer member 2 and the second buffer member 3 are at least partially aligned in the thickness direction of the housing body 1. This embodiment includes the following implementations: the projections of the first buffer member 2 and the second buffer member 3 partially overlap in the thickness direction of the housing body 1; the projections of the first buffer member 2 and the second buffer member 3 completely overlap in the thickness direction of the housing body 1. Figure 4 As shown, a base plate is set on the upper side of the housing body 1. Figure 4The battery cell (Q side) is located on the lower side of the housing body 1. Figure 4 Taking the V side as an example, specifically, when an external force is applied to region m of the housing body 1 in the direction shown by arrow M through the vehicle floor, due to the setting of the first buffer 2 in region m of the housing body 1, the first buffer 2 set in region m will offset the external force applied to the housing body 1 by the floor through contraction; here, region m of the housing body 1 will continue to move in the direction shown by arrow M, and since the first buffer 2 and the second buffer 3 at least partially overlap, the second buffer 3 set in region m of the housing body 1 will contract to offset the force applied to the battery cell by the housing body 1, thereby reducing or even avoiding contact between the housing body 1 and the floor or battery cell, thus protecting the housing body 1 on both sides. Correspondingly, when an external force is applied to region m of the housing body 1 in the direction indicated by arrow N through the battery cells of the battery pack, the second buffer 3 in region m of the housing body 1 will shrink to offset the external force applied to the housing body 1 by the battery cells. Here, region m of the housing body 1 will continue to move in the direction indicated by arrow N. Since the first buffer 2 and the second buffer 3 at least partially overlap, the first buffer 2 in region m of the housing body 1 will shrink to offset the force applied to the vehicle floor by the housing body 1, thereby reducing or even preventing the housing body 1 from contacting the floor or the battery cells, thus protecting the housing body 1 on both sides.

[0035] It should be noted that the thickness direction of the shell body 1 is... Figure 4 The direction indicated by the double-headed arrow Z; the side of the shell body 1 facing away from the box is... Figure 4 On side E of the middle shell body 1, the side of the shell body 1 closest to the box is Figure 4 The F side of the middle shell body 1.

[0036] For example, the first buffer 2 and the second buffer 3 can be foam.

[0037] The battery casing with the above-described structure, by respectively providing a first buffer 2 and a second buffer 3 on both sides of the casing body 1, can reduce the shaking of the casing body 1 when the battery pack is subjected to external force, thereby protecting the casing body 1, reducing the probability of the casing body 1 breaking due to impact, and improving the stability of the battery casing. Furthermore, in the thickness direction of the casing body 1, the projections of the first buffer 2 and the second buffer 3 at least partially overlap. Thus, when the area of ​​the housing body 1 where the first buffer member 2 is located is subjected to a force from the vehicle floor towards the housing body 1, the second buffer member 3, which partially overlaps with the first buffer member 2, is located on the other side of the housing body 1. The second buffer member 3 can then contract to buffer the bending of the housing body 1 towards the battery pack's receiving cavity. Correspondingly, when the area of ​​the housing body 1 where the second buffer member 3 is located is subjected to a force from the housing body 1 towards the vehicle floor, the first buffer member 2, which partially overlaps with the second buffer member 3, is located on the other side of the housing body 1. The first buffer member 2 can then contract to buffer the bending of the housing body 1 towards the side away from the battery pack's receiving cavity. In summary, through the above-described arrangement, the housing body 1 can be further protected, and its structural stability can be further improved.

[0038] In some embodiments, please refer to Figure 1 and Figure 3 In the thickness direction of the housing body 1, the projection of the first buffer member 2 is completely located within the second buffer member 3, meaning that the size of the first buffer member 2 is less than or equal to the size of the second buffer member 3. Thus, when the housing body 1 is subjected to an external force from the base plate towards the battery casing, the base plate tends to move closer to the housing body 1, and the housing body 1 tends to move towards the battery cell side. This causes the first buffer member 2 and the second buffer member 3, located on both sides of the housing body 1, to contract. Since the projection of the first buffer member 2 is completely located within the second buffer member 3, the directions of the contraction forces of the first buffer member 2 and the second buffer member 3 are approximately opposite, thus preventing the force on the housing body 1 from shifting, thereby balancing the external force on the housing body 1, further reducing the probability of damage to the housing body 1 under external force, and further improving the protection effect of the housing body 1. Correspondingly, when the housing body 1 is subjected to an external force from the housing body 1 towards the base plate, both the first buffer member 2 and the second buffer member 3 will contract, achieving the same effect and further improving the protection effect of the housing body 1.

[0039] Further details based on the above embodiments can be found in the following examples. Figure 3In the thickness direction of the shell body 1, the center of the first buffer 2 and the center of the second buffer 3 coincide. When the shell body 1 is subjected to external force, both the first buffer 2 and the second buffer 3 will contract. Thus, the elastic forces applied by the first buffer 2 and the second buffer 3 to the shell body 1 are in completely opposite directions. This can further improve the balance of force on the first buffer 2 and the second buffer 3 on both sides of the shell body 1, and further improve the structural stability of the shell body 1.

[0040] In some embodiments, the cross-sectional area of ​​the first buffer 2 is S1, and the cross-sectional area of ​​the second buffer 3 is S2, wherein S1 and S2 satisfy the following condition: 1 ≥ S1 / S2 ≥ 0.7. That is, the ratio between the cross-sectional area of ​​the first buffer 2 and the cross-sectional area of ​​the second buffer 3 is greater than or equal to 0.7. If the ratio between the cross-sectional area of ​​the first buffer 2 and the cross-sectional area of ​​the second buffer 3 is less than 0.7, then the cross-sectional area of ​​the first buffer 2 is much smaller than the cross-sectional area of ​​the second buffer 3. Thus, when the shell body 1 is subjected to external force and both the first buffer 2 and the second buffer 3 are compressed, due to the large difference in the cross-sectional areas of the first buffer 2 and the second buffer 3, the compressive force exerted on the shell body 1 by the first buffer 2 and the second buffer 3 on the shell body 1 will be significantly different. This results in a large difference in the buffering effect of the first buffer 2 and the second buffer 3 on the shell body 1 on both sides, making the shell body 1 prone to breakage. This ensures that the ratio between the cross-sectional area of ​​the first buffer 2 and the cross-sectional area of ​​the second buffer 3 meets the above-mentioned range. When the shell body 1 is subjected to external force and both the first buffer 2 and the second buffer 3 are compressed, the compressive force of the first buffer 2 and the second buffer 3 on the shell body 1 is approximately equal, thereby ensuring that the shell body 1 is subjected to balanced force, reducing the probability of the shell body 1 breaking, and further improving the protection effect of the shell body 1.

[0041] For example, the ratio between the cross-sectional area of ​​the first buffer 2 and the cross-sectional area of ​​the second buffer 3 can be 0.7, 0.71, 0.73, 0.75, 0.8, 0.85, 0.9, 0.95, 0.98, 1, etc. Furthermore, the ratio between the cross-sectional area of ​​the first buffer 2 and the cross-sectional area of ​​the second buffer 3 can also be greater than 1, such as 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3, etc.

[0042] In some embodiments, please refer to Figure 1 and Figure 4Multiple first buffer members 2 and multiple second buffer members 3 are provided. The first buffer members 2 and the second buffer members 3 are evenly arranged along the length and / or width direction of the shell body 1. That is, the first buffer members 2 and the second buffer members 3 are evenly arranged within the plane of the shell body 1. Thus, when different parts of the shell body 1 are subjected to external forces, the first buffer members 2 and the second buffer members 3 located on the surface of that area of ​​the shell body 1 can contract to protect the shell body 1, further improving its stability. Furthermore, since the first buffer members 2 and the second buffer members 3 are evenly arranged, when a certain area of ​​the shell body 1 is subjected to external forces, the first buffer members 2 and the second buffer members 3 located near that area can also appropriately contract to alleviate the external forces on the shell body 1, thereby reducing the deformation of the shell body 1 and further protecting it.

[0043] For example, the length direction of the housing body 1 is Figure 4 The direction indicated by the double-headed arrow X is the width direction of the shell body 1. Figure 4 The direction indicated by the double-headed arrow Y.

[0044] In some embodiments, a first rib 4 is stamped on the end face of the housing body 1 facing away from the housing body in the direction opposite to the housing body. It should be noted that the direction of the housing body 1 facing away from the housing body is... Figure 2 The direction indicated by the middle arrow U. By setting the first rib 4, the surface of the shell body 1 can form a concave-convex structure. Setting the first rib 4 can improve the structural strength of the shell body 1, so as to avoid excessive local bending and cracking of the shell body 1 when it is subjected to external force, thereby improving the overall integrity of the shell body 1.

[0045] For example, the first rib 4 is integrally formed on the surface of the housing body 1 by stamping, which can further improve the integrity of the housing body 1 and further improve the structural strength of the housing body 1.

[0046] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4Multiple first ribs 4 are provided, and these first ribs 4 are spaced apart along the length and / or width direction of the shell body 1. Specifically, this embodiment includes the following implementation methods: multiple first ribs 4 are spaced apart along the length direction of the shell body 1; multiple first ribs 4 are spaced apart along the width direction of the shell body 1; multiple first ribs 4 are spaced apart along both the length and width directions of the shell body 1. That is, the first ribs 4 are spaced apart on the plane of the shell body 1. Here, by spaced-apart the first ribs 4 within the plane of the shell body 1, the first ribs 4 can be more evenly distributed on the plane of the shell body 1, thereby improving the uniformity of the arrangement of the first ribs 4. This can evenly improve the structural strength of each part of the shell body 1, so that the shell body 1 can be subjected to balanced forces when subjected to external forces, thereby improving the overall integrity of the shell body 1.

[0047] In some embodiments, please refer to Figure 1 and Figure 4 In the thickness direction of the housing body 1, the first buffer 2 and the second buffer 3 are respectively disposed on both sides of the protruding end face of the first rib 4. Since the first rib 4 protrudes from the side where the housing is located to the side where the housing is located, the first buffer 2 is disposed on the protruding end face of the first rib 4, that is, the first buffer 2 is disposed between the higher end face of the housing body 1 and the bottom plate. Since the protruding end face of the first rib 4 is the main area where the housing body 1 and the bottom plate collide, the first buffer 2 can better buffer and depressurize the housing body 1, and can better protect the housing body 1. Furthermore, increasing the thickness of the second buffer 3 disposed on the other side of the first rib 4, so that the height of the second buffer 3 before compression is greater than the protrusion height of the first rib 4, can also enable the second buffer 3 to protect the housing body 1 and the battery cell on the other side of the housing body 1, thereby improving the structural stability of the housing body 1.

[0048] In addition, the first buffer 2 and the second buffer 3 can also be set at other positions of the housing body 1. For example, the first buffer 2 and the second buffer 3 can be set at the recessed position between adjacent first ribs 4 of the housing body 1. In this case, the height of the first buffer 2 before compression is greater than the protrusion height of the first rib 4, so that the first buffer 2 can also play the role of protecting the housing body 1.

[0049] In some embodiments, please refer to Figure 4The minimum distance between the first rib 4 and the edge of the end face of the shell body 1 where the first rib 4 is located is K, and the thickness of the shell body 1 is T, where K and T satisfy: 3×T≤K. If the minimum distance between the first rib 4 and the edge of the end face of the shell body 1 where the first rib 4 is located is too small, when the shell body 1 is stamped to form the first rib 4, the first rib 4 will be too close to the end face of the shell body 1 where the first rib 4 is located, resulting in poor structural stability of the first rib 4 in that area. Thus, when this area of ​​the shell body 1 is subjected to external force, the shell body 1 is prone to cracking, resulting in poor structural stability of the shell body 1. Ensuring that the distance between the first rib 4 and the edge of the end face of the shell body 1 where the first rib 4 is located meets the above range can improve the structural strength at the location where the first rib 4 is located, prevent the area of ​​the shell body 1 from cracking when subjected to external force, thereby protecting the shell body 1 and improving the structural stability of the shell body 1.

[0050] For example, the minimum distance K between the first rib 4 and the edge of the end face of the housing body 1 where the first rib 4 is set can be 3T, 3.5T, 4T, 5T, 8T, 10T, 15T, 20T, 30T, 50T, etc.

[0051] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 The first rib 4 is a strip-shaped protrusion that undergoes multiple bends. That is, the first rib 4 is a non-linear strip-shaped protrusion; for example, the first rib 4 can be a curved or zigzag strip-shaped protrusion. Here, by subjecting the first rib 4 to multiple bends, compared to a straight strip-shaped protrusion, the bending resistance of the first rib 4 can be improved, and the structural strength of the first rib 4 can be increased. Thus, when the shell body 1 is subjected to external force and tends to bend, the first rib 4 prevents the shell body 1 from deforming through elastic deformation, thereby improving the structural strength of the shell body 1, mitigating or even preventing the shell body 1 from cracking due to impact, and further improving the structural stability of the shell body 1.

[0052] In addition, the first rib 4 can also be a straight strip protrusion, or the first protrusion can be a non-strip protrusion such as a block protrusion or an irregular protrusion.

[0053] In some embodiments, please refer to Figure 6 and Figure 7The housing body 1 includes a linear protrusion 5 located in the middle of the housing body 1 and arranged along the length direction of the housing body 1. Since the battery pack also includes structures such as copper busbars, connecting busbars, or lead-out electrodes connected to the battery cells, the linear protrusion 5 is provided to provide installation positions for the copper busbars, connecting busbars, or lead-out electrodes. The linear protrusion 5 includes a protrusion end 51 and a first inclined portion 52 and a second inclined portion 53 located on both sides of the protrusion end 51. In the width direction of the linear protrusion 5, the width of the linear protrusion 5 is A, and the width of the protrusion end 51 is B. In the inclined direction of the first inclined portion 52, the dimension of the first inclined portion 52 is C. In the inclined direction of the second inclined portion 53, the dimension of the second inclined portion 53 is D. Wherein A, B, C, and D satisfy: 1 ​​< (B + C + D) / A ≤ 1.38. Typically, linear protrusions 5 are formed by stamping. If the value of (B+C+D) / A is too large, meaning the dimensions of the first inclined portion 52 and / or the second inclined portion 53 are too large, or the inclination angle of the first inclined portion 52 and / or the second inclined portion 53 is too large, then greater stamping pressure is required when forming the linear protrusion 5. This makes forming the linear protrusion 5 difficult and increases the likelihood of it breaking during forming. Ensuring that the value of (B+C+D) / A is within the aforementioned range reduces the overall dimensions of the first inclined portion 52 and the second inclined portion 53, preventing excessive stamping pressure on the linear protrusion 5, reducing the forming difficulty of the linear protrusion 5, and decreasing the probability of it breaking during forming.

[0054] For example, the width direction of the linear protrusion 5 is Figure 7 The direction indicated by the double-headed arrow G is the tilt direction of the first tilted part 52. Figure 7 The direction indicated by the double-headed arrow H is the inclination direction of the second inclined part 53. Figure 7 The direction indicated by the double-headed arrow I.

[0055] For example, the value of (B+C+D) / A can be 1.38, 1.37, 1.35, 1.3, 1.25, 1.2, 1.15, 1.1, 1.05, 1.02, etc.

[0056] In some embodiments, the initial compression rate of the first buffer 2 and the second buffer 3 is 10% to 20%, that is, the thickness of the first buffer 2 and the second buffer 3 installed on the housing body 1 is 80% to 90% of the thickness before compression. In other words, the initial compression of the first buffer 2 and the second buffer 3 installed on the housing body 1 is small. In this way, when the housing body 1 is subjected to external force, the first buffer 2 and the second buffer 3 still have a large compression space. Thus, when the housing body 1 is subjected to external force, the first buffer 2 and the second buffer 3 can provide cushioning for the housing body 1 through more contraction, so as to further improve the protection effect of the housing body 1.

[0057] For example, the initial compression ratio of the first buffer 2 and the second buffer 3 can be 10%, 11%, 12%, 15%, 18%, 19%, 20%, etc.

[0058] Of course, the initial compression ratio of the first buffer 2 and the second buffer 3 can also be in the range of 0 to 10%, or in the range of more than 20%.

[0059] In some embodiments, please refer to Figure 4 and Figure 5 The housing body 1 includes an annular connecting portion 6 for connection with the housing body, typically connected by bolts. A second rib 8 is stamped onto the annular connecting portion 6 in the direction away from the housing body 1, meaning a concave-convex structure is formed on the surface of the annular connecting portion 6. The second rib 8 enhances the structural strength of the annular connecting portion 6, preventing breakage due to excessive local bending, thus improving the overall integrity of the housing body 1.

[0060] For example, the second rib 8 is integrally formed on the surface of the annular connecting part 6 by stamping, which can further improve the integrity of the annular connecting part 6 and further improve the structural strength of the annular connecting part 6.

[0061] In some embodiments, please refer to Figure 4 and Figure 5 In the circumferential direction of the shell body 1, the annular connecting part 6 has multiple connecting holes 7. Connectors pass through the connecting holes 7 to connect the annular connecting part 6 to the housing, thus improving the structural stability between the annular connecting part 6 and the housing. Furthermore, multiple second ribs 8 are provided, which further enhances the overall structural integrity of the annular connecting part 6, thereby increasing its structural strength. Moreover, the second ribs 8 are positioned between adjacent connecting holes 7, meaning they are spaced apart. This facilitates the arrangement and placement of the second ribs 8, resulting in a more uniform distribution of them on the annular connecting part 6, further ensuring similar structural strength across different parts of the annular connecting part 6.

[0062] Further, based on the above embodiment, the distance L1 between adjacent connecting holes 7, the width L2 of the portion of the annular connecting part 6 where the connecting holes 7 are located, the length L3 of the second rib 8, and the width L4 of the second rib 8, wherein L1, L2, L3, and L4 satisfy the following condition: 1 > (L3 × L4) / (L1 × L2) > 0.3. That is, the ratio between the area of ​​the first rib 4 and the area between adjacent connecting holes 7 is greater than 0.3. If the ratio between the area of ​​the first rib 4 and the area between adjacent connecting holes 7 is too small, the size of the second rib 8 will be too small, resulting in a smaller improvement in the structural strength of the annular connecting part 6. This arrangement increases the proportion of the second rib 8's size, thereby improving the overall structural strength of the annular connecting part 6.

[0063] For example, the ratio of (L3×L4) / (L1×L2) can be 0.31, 0.32, 0.35, 0.38, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, etc.

[0064] In some embodiments, please refer to the figure. Figure 8 The housing body 1 includes a flanged portion 9 connected to the annular connecting portion 6. In the extending direction of the flanged portion 9, the flanged portion 9 includes an arc-shaped portion 91 and an extension portion 92, which are sequentially arranged and integrally formed. That is, the flanged portion 9 is formed by a partial stretching and folding of the annular connecting portion 6. The radius of the arc-shaped portion 91 is R, and the thickness of the flanged portion 9 is t. In the extending direction of the flanged portion 9, the dimension of the flanged portion 9 is L, and the dimension of the extension portion 92 is S. R, L, and S satisfy the following relationship: L = R + S, R ≥ 2t. Since a sealing strip is provided between the annular connecting portion 6 and the housing, by setting the flanged portion 9 as described above, the flanged portion 9 can shield the location of the sealing strip, thereby improving the waterproof performance of the battery pack. Thus, when the battery pack is in a water-immersed environment, the flanged portion can protect the sealing strip, thereby improving the safety of the battery pack seal. Furthermore, the radius of the arc-shaped portion 91 is ensured to be greater than or equal to twice the thickness of the sheet metal, thereby improving the accuracy and performance of the flanged portion 9 when bent.

[0065] In some embodiments, please refer to Figure 5The annular connecting portion 6 includes a linear segment 61 and an arc segment 62, with the flange 9 connected to the linear segment 61. That is, the flange 9 is formed only by folding the linear segment 61 of the annular connecting portion 6, and is not located at the position of the arc segment 91 of the annular connecting portion 6. Since the flange 9 is stamped from the housing body 1, when the flange 9 is formed at the arc segment 62 of the annular portion, the arc segment 62 is the corner of the annular connecting portion 6. Forming the flange 9 at this position could lead to a risk of tearing or material accumulation. Therefore, by forming the flange 9 only at the linear segment 61 of the annular connecting portion 6, the risk of tearing or material accumulation during the formation of the flange 9 is reduced or even avoided, thereby improving the forming effect of the flange 9.

[0066] In some embodiments, a fire-retardant coating is applied to both sides of the housing body 1. For example, if the housing body 1 is the housing of a prismatic lithium iron phosphate, pouch lithium iron phosphate, or cylindrical lithium iron phosphate battery, the fire-retardant coating is formed on the surface of the housing body 1 by electrophoresis; if the housing body 1 is the housing of a prismatic, pouch, or cylindrical ternary nickel-metal phosphate battery, the fire-retardant coating is formed by fire-retardant spraying on the surface of the housing body 1, or by electrophoresis + mica coating on the surface of the housing body 1; if the housing body 1 is the housing of a blade lithium iron phosphate battery, the fire-retardant coating is formed on the surface of the housing body by insulating spraying; if the housing body 1 is the housing of a ternary high-nickel cell or a semi-solid or solid-state battery, the fire-retardant coating is formed on the surface of the housing body 1 by fire-retardant spraying + mica coating. Different thermal protection schemes are adopted for different cell systems, and the housing body 1 can take into account the thermal protection capabilities of different cell systems, improving the thermal safety of the battery pack and thus improving the safety performance of the electric vehicle.

[0067] This application also provides a battery pack including the above-described battery casing. Since the battery pack includes the battery casing as described above, the beneficial effects of the battery casing on the battery pack are as described above and will not be repeated here.

[0068] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0069] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0070] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0071] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0072] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0073] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery casing, characterized in that, The battery casing is fastened to the battery pack housing to form a cavity for accommodating the battery cells, and the battery casing includes: Shell body; Both the first buffer and the second buffer are connected to the housing body. The first buffer is located on the side of the housing body away from the box, and the second buffer is located on the side of the housing body close to the box. In the thickness direction of the housing body, the projections of the first buffer and the second buffer at least partially overlap.

2. The battery casing according to claim 1, characterized in that, In the thickness direction of the housing body, the projection of the first buffer member is completely located within the second buffer member.

3. The battery casing according to claim 2, characterized in that, The cross-sectional area of ​​the first buffer is S1, and the cross-sectional area of ​​the second buffer is S2, wherein S1 and S2 satisfy the following condition: 1≥S1 / S2≥0.

7.

4. The battery casing according to any one of claims 1 to 3, characterized in that, Multiple first and second buffers are provided. Multiple first buffers are evenly arranged in the length direction and / or width direction of the housing body, and multiple second buffers are evenly arranged.

5. The battery casing according to claim 1, characterized in that, In the direction of the housing body away from the box body, a first rib is stamped on the end face of the housing body away from the box body; and multiple first ribs are provided, and multiple first ribs are spaced apart in the length direction and / or width direction of the housing body.

6. The battery casing according to claim 5, characterized in that, In the thickness direction of the housing body, the first buffer and the second buffer are respectively disposed on both sides of the protruding end face of the first rib.

7. The battery casing according to claim 5, characterized in that, The minimum distance between the first rib and the edge of the end face of the shell body where the first rib is located is K, and the thickness of the shell body is T, wherein K and T satisfy: 3×T≤K.

8. The battery casing according to any one of claims 5 to 7, characterized in that, The first rib is a strip-shaped protrusion that undergoes multiple bends.

9. The battery casing according to claim 1, characterized in that, The housing body includes a linear protrusion located in the middle of the housing body and arranged along the length direction of the housing body. The linear protrusion includes a protruding end and a first inclined portion and a second inclined portion located on both sides of the protruding end, wherein: In the width direction of the linear protrusion, the width of the linear protrusion is A, and the width of the end of the protrusion is B; in the inclination direction of the first inclined portion, the dimension of the first inclined portion is C; in the inclination direction of the second inclined portion, the dimension of the second inclined portion is D; wherein A, B, C and D satisfy: 1 ​​< (B + C + D) / A ≤ 1.

38.

10. The battery casing according to claim 1, characterized in that, The initial compression ratio of both the first and second buffer components is 10% to 20%.

11. The battery casing according to claim 1, characterized in that, The housing body includes an annular connecting portion for connecting with the box body, and a second rib is stamped on the annular connecting portion in the direction away from the box body of the housing body; In the circumferential direction of the housing body, a plurality of connecting holes are provided on the annular connecting portion, and a plurality of second protruding ribs are provided, with the second protruding ribs being disposed between adjacent connecting holes.

12. The battery casing according to claim 11, characterized in that, The distance between adjacent connecting holes is L1, the width of the portion of the annular connecting part where the connecting holes are opened is L2, the length of the second rib is L3, and the width of the second rib is L4, wherein L1, L2, L3 and L4 satisfy the following condition: 1 > (L3 × L4) / (L1 × L2) > 0.

3.

13. The battery casing according to claim 12, characterized in that, The housing body includes a flanged portion connected to the annular connecting portion. In the extending direction of the flanged portion, the flanged portion includes an arc-shaped portion and an extension portion that are sequentially arranged and integrally formed, wherein: The radius of the arc-shaped part is R, and the thickness of the flange is t; in the extension direction of the flange, the dimension of the flange is L, and the dimension of the extension is S; wherein R, L, and S satisfy the following relationship: L = R + S, R ≥ 2t.

14. A battery pack, characterized in that, Includes a battery casing as described in any one of claims 1-13 above.

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