Shell structure and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a shell structure and a battery, the shell structure comprises an anti-explosion valve, a first wall body and a second wall body, the first wall body is provided with an anti-explosion hole, the anti-explosion valve is plugged at the anti-explosion hole, the second wall body is connected with the first wall body, and the edge of the second wall body connected with the first wall body is parallel to a first direction. The side, facing the first wall body, of the second wall body is provided with a reinforcing structure, the reinforcing structure is located in the middle of the second wall body in the first direction, and the anti-explosion valve is located in the middle of the first wall body in the first direction, so that the welding yield of the anti-explosion valve can be improved, and the problem that the pole group interferes with the second wall body when entering the shell can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a housing structure and a battery. Background Art

[0002] Common lithium batteries generally have two shapes: rectangular and cylindrical. As Figure 1 shown, an explosion-proof valve 2 is provided on the small surface 1 of the housing of the rectangular lithium battery. In actual production, mounting holes are punched on the small surface 1 of the housing first, and then the explosion-proof valve 2 is welded at the mounting holes.

[0003] In the prior art, in order to improve the energy density of the lithium battery, the thickness of the battery case is usually made thinner. When punching the mounting holes on the small surface 1 of the housing, since the structural strength of the large surface 3 of the thinner housing is low, a recessed area 4 will be formed in the area adjacent to the punching position on the large surface 3 of the housing. The recessed area 4 pulls the edge of the mounting hole to deform the mounting hole, thereby reducing the dimensional accuracy of the mounting hole. When welding the explosion-proof valve 2, the position of the mounting hole cannot be accurately positioned, reducing the welding yield of the explosion-proof valve 2. In addition, a large amount of heat is generated when welding the explosion-proof valve 2, causing plastic deformation in the area of the large surface 3 of the housing adjacent to the mounting hole (i.e., the above-mentioned recessed area 4), which increases the deformation amount of the recessed area 4 and the deformation amount of the mounting hole. After the explosion-proof valve 2 is welded, there is a gap between the edge of the explosion-proof valve 2 and the hole wall of the mounting hole, further reducing the welding yield of the explosion-proof valve 2.

[0004] Therefore, there is an urgent need to propose a housing structure and a battery to solve the above technical problems. Summary of the Invention

[0005] The first object of the present invention is to provide a housing structure that can not only improve the welding yield of the explosion-proof valve but also avoid the problem of interference between the electrode group and the second wall when the electrode group enters the housing.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A housing structure, comprising:

[0008] An explosion-proof valve;

[0009] A first wall body, provided with an explosion-proof hole on the first wall body, and the explosion-proof valve is plugged at the explosion-proof hole;

[0010] A second wall body, connected to the first wall body, and the edge where the second wall body is connected to the first wall body is parallel to the first direction. A reinforcing structure is provided on the side of the second wall body facing the first wall body. The reinforcing structure is located in the middle of the second wall body in the first direction, and the explosion-proof valve is located in the middle of the first wall body in the first direction.

[0011] Optionally, the reinforcing structure extends in a second direction, and the second direction is parallel to the surface of the second wall body and perpendicular to the first direction.

[0012] Optionally, the number of the second wall bodies is two, and the two second wall bodies are arranged oppositely along the third direction, and both the first direction and the second direction are perpendicular to the third direction.

[0013] Optionally, the dimension of the reinforcing structure extending along the second direction is W, and the distance between the two opposite sides of the two second wall bodies is L1;

[0014] W / L1≥1.04;

[0015] and / or, W / L1<1.3.

[0016] Optionally, the explosion-proof valve is in a runway shape, the explosion-proof valve includes a straight area and two semi-circular areas, the two semi-circular areas are symmetrically arranged about the straight area along the first direction, the dimension of the straight area in the first direction is K, the dimension of the reinforcing structure in the first direction is W1, and W1≥K.

[0017] Optionally, a first reinforcing rib is further provided on the first wall body, and the first reinforcing rib is located at the edge of the explosion-proof hole.

[0018] Optionally, the number of the first reinforcing ribs is two, and the two first reinforcing ribs are arranged oppositely with respect to the axis of the explosion-proof hole.

[0019] Optionally, the area of the positive projection of each first reinforcing rib on the first wall body is S1, and the area of the explosion-proof hole is S2;

[0020] S1 / S2≥0.18;

[0021] and / or, S1 / S2≤0.33.

[0022] Optionally, the first reinforcing rib is located on the outer surface of the first wall body, and the outer surface of the explosion-proof valve does not protrude from the outer surface of the first wall body.

[0023] The second object of the present invention is to provide a battery, the explosion-proof valve of the battery has a high welding yield, and the shelling efficiency and yield of the electrode group are high.

[0024] To achieve this object, the present invention adopts the following technical solutions:

[0025] A battery, comprising an electrode group and the above-mentioned housing structure, the housing structure is provided with an installation cavity, and the electrode group is arranged in the installation cavity.

[0026] The beneficial effects of the present invention:

[0027] The housing structure provided by the present invention has an explosion-proof hole on the first wall body, and an explosion-proof valve is plugged at the explosion-proof hole. The second wall body is connected to the first wall body, and the edge where the second wall body is connected to the first wall body is parallel to the first direction. A strengthening structure is provided on the side of the second wall body facing the first wall body. The strengthening structure is located in the middle of the second wall body in the first direction, and the explosion-proof valve is located in the middle of the first wall body in the first direction. The setting of the strengthening structure improves the structural strength of the area of the second wall body near the explosion-proof hole (hereinafter referred to as the easily deformed area). When stamping the explosion-proof hole on the first wall body, the probability of deformation problems in the easily deformed area can be reduced, thereby improving the dimensional accuracy of the explosion-proof hole, the positioning accuracy of the explosion-proof hole when welding the explosion-proof valve, and the welding yield rate of the explosion-proof valve.

[0028] Secondly, when welding the explosion-proof valve at the explosion-proof hole, since the easily deformed area has a high structural strength, the probability of plastic deformation due to heat in the easily deformed area is also low, reducing the probability of a gap between the explosion-proof valve and the hole wall of the explosion-proof hole, and further improving the welding yield rate of the explosion-proof valve.

[0029] Thirdly, due to the high flatness of the second wall body, when assembling the electrode group into the housing structure, the probability of interference between the electrode group and the second wall body is low, enabling the electrode group to be assembled into the housing structure more smoothly and avoiding the problem of the second wall body scratching the electrode group. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a battery case in the prior art;

[0031] Figure 2 is a first schematic structural diagram of the housing structure provided by the present invention;

[0032] Figure 3 is a second schematic structural diagram of the housing structure provided by the present invention;

[0033] Figure 4 is a third schematic structural diagram of the housing structure provided by the present invention;

[0034] Figure 5 is Figure 3 a cross-sectional view taken along the F-F direction of

[0035] Figure 6 is Figure 5 a partially enlarged schematic structural diagram of

[0036] Figure 7 is Figure 3 a cross-sectional view taken along the E-E direction of

[0037] Figure 8 is Figure 7 a partially enlarged schematic structural diagram at position A of

[0038] Figure 9 It is a schematic structural diagram of the battery provided by the present invention.

[0039] In the figure:

[0040] 1. Small surface of the housing; 2. Explosion-proof valve; 3. Large surface of the housing; 4. Concave area;

[0041] D1. First direction; D2. Second direction; D3. Third direction;

[0042] 10. Housing structure; 20. Cover plate;

[0043] 100. Explosion-proof valve; 110. Straight area; 120. Semi-circular area; 200. First wall body; 210. First reinforcing rib; 300. Second wall body; 310. Reinforcing structure; 311. Second reinforcing rib; 312. Second groove; 320. Deformable area; 321. First deformation area; 322. Second deformation area; 400. Third wall body; 500. Installation cavity. Specific embodiments

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0045] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] This embodiment provides a housing structure, which can not only improve the welding yield of the explosion-proof valve, but also avoid the problem of interference between the electrode group and the second wall when the electrode group enters the housing.

[0049] Specifically, as Figures 2 to 4 shown, the housing structure includes an explosion-proof valve 100, a first wall 200, and a second wall 300. Among them, an explosion-proof hole (not shown in the figure) is provided on the first wall 200, and the explosion-proof valve 100 seals the explosion-proof hole. The second wall 300 is connected to the first wall 200, and the edge where the second wall 300 is connected to the first wall 200 is parallel to the first direction D1. A reinforcing structure 310 is provided on the side of the second wall 300 facing the first wall 200. The reinforcing structure 310 is located in the middle of the second wall 300 in the first direction D1, and the explosion-proof valve 100 is located in the middle of the first wall 200 in the first direction D1.

[0050] The setting of the reinforcing structure 310 improves the structural strength of the area of the second wall 300 near the explosion-proof hole (hereinafter referred to as the easily deformed area 320). When stamping the explosion-proof hole on the first wall 200, it can reduce the probability of deformation problems in the easily deformed area 320, thereby improving the dimensional accuracy of the explosion-proof hole, improving the positioning accuracy of the explosion-proof hole when welding the explosion-proof valve 100, and improving the welding yield of the explosion-proof valve 100, which is conducive to realizing the automated batch production of the housing structure and the battery.

[0051] Secondly, when welding the explosion-proof valve 100 at the explosion-proof hole, since the easily deformed area 320 has a high structural strength, the probability of plastic deformation of the easily deformed area 320 due to heat is also low, reducing the probability of a gap between the explosion-proof valve 100 and the hole wall of the explosion-proof hole, and further improving the welding yield of the explosion-proof valve 100.

[0052] Thirdly, due to the high flatness of the second wall 300, when loading the electrode group (not shown in the figure) into the housing structure, the probability of interference between the electrode group and the second wall 300 is low, enabling the electrode group to be loaded into the housing structure more smoothly and avoiding the problem of the second wall 300 scratching the electrode group.

[0053] Optionally, the reinforcing structure 310 extends along a second direction D2, which is parallel to the surface of the second wall 300 and perpendicular to the first direction D1. The design of extending the reinforcing structure 310 along the second direction D2 can improve the supporting effect of the reinforcing structure 310 on the deformable area 320 and further reduce the deformation probability of the deformable area 320.

[0054] Optionally, the number of the second walls 300 is two, and the two second walls 300 are arranged oppositely along a third direction D3. Both the first direction D1 and the second direction D2 are perpendicular to the third direction D3. When stamping the explosion-proof holes and welding the explosion-proof valves 100 on the first wall 200, the deformable areas 320 of the two second walls 300 both have high anti-deformation capabilities. Furthermore, the probability of deformation on the opposite sides of the explosion-proof holes in the third direction D3 is relatively low, which provides further guarantee for the welding yield of the explosion-proof valves 100.

[0055] The housing structure provided in this embodiment is generally rectangular. The housing structure further includes a third wall 400. The third wall 400 is arranged oppositely to the first wall 200 in the second direction D2, and the two opposite sides of the third wall 400 in the third direction D3 are respectively connected to the corresponding second walls 300. That is, the first wall 200, the third wall 400, and the two second walls 300 enclose an open installation cavity 500 for accommodating the electrode group. Of course, in other embodiments, the housing structure may also be other shapes such as a pentagonal prism as long as the two second walls 300 are arranged oppositely in the third direction D3 and are both connected to the first wall 200.

[0056] Optionally, as Figure 5 and Figure 6 shown, the dimension of the reinforcing structure 310 extending along the second direction D2 is W, and the distance between the two opposite sides of the two second walls 300 is L1, and W / L1 ≥ 1.04. Exemplarily, W / L1 can be 1.04, 1.1, or 1.2, etc., to ensure that the reinforcing structure 310 has sufficient volume in the second direction D2 to improve the structural strength of the deformable area 320.

[0057] Optionally, W / L1 < 1.3. Exemplarily, W / L1 can be 1.25, 1.13, 1.05, etc. When stamping the explosion-proof hole on the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, only the area of the second wall 300 close to the explosion-proof hole (i.e., the easily deformable area 320) is prone to deformation, and other areas on the second wall 300 (such as the middle area of the second wall 300 and the area of the second wall 300 facing the third wall 400) are not prone to deformation. If W / L1 is too large, i.e., W is too large, it will not improve the structural strength of the easily deformable area 320, but will increase the weight and volume of the housing structure, which is not conducive to improving the energy density of the battery. At the same time, it will also increase the production materials of the second wall 300, which is not conducive to saving production costs. Therefore, W is not the larger the better. Making W / L1 < 1.3 is conducive to improving the energy density of the battery and saving production costs.

[0058] In this embodiment, keeping W / L1 within a reasonable range, i.e., 1.04 ≤ W / L1 < 1.3, can not only improve the structural strength of the easily deformable area 320 and achieve the effect of improving the welding yield of the explosion-proof valve 100, but also is conducive to improving the energy density of the battery and saving production costs. Of course, in other implementation schemes, either W / L1 ≥ 1.04 or W / L1 < 1.3 can be selected. If W / L1 < 1.04, the probability of deformation of the easily deformable area 320 will increase slightly. If W / L1 ≥ 1.3, it will reduce the energy density of the battery and increase the production cost of the housing structure.

[0059] Optionally, as Figure 3 , Figure 4 and Figure 7As shown, the explosion-proof valve 100 and the explosion-proof hole are both runway-shaped. The explosion-proof valve 100 includes a straight section 110 and two semi-circular sections 120. The two semi-circular sections 120 are symmetrically arranged about the straight section 110 in the first direction D1. The dimension of the straight section 110 in the first direction D1 is K, and the dimension of the strengthening structure 310 in the first direction D1 is W1, where W1≥K. When welding the explosion-proof valve 100 at the explosion-proof hole, the welding heat gradually transfers from the edge of the explosion-proof valve 100 (i.e., the welding position of the explosion-proof valve 100) to the first wall 200 and the second wall 300. Along the direction in which the semi-circular section 120 deviates from the straight section 110, the distance M between the edge of the semi-circular section 120 (i.e., the welding position of the semi-circular section 120) and the second wall 300 gradually increases, while the distance N between the edge of the straight section 110 (i.e., the welding position of the straight section 110) and the second wall 300 remains constant all the time, and the minimum value of M is equal to N. Therefore, the welding heat transferred from the straight section 110 to the second wall 300 is much greater than the welding heat transferred from the semi-circular section 120 to the second wall 300. The deformable area 320 on the second wall 300 can be roughly divided into a first deformation area 321 and two second deformation areas 322. Among them, the first deformation area 321 corresponds to the straight section 110, and the two second deformation areas 322 respectively correspond to one of the semi-circular sections 120. When welding the explosion-proof valve 100, the heat received by the first deformation area 321 is much greater than that received by the second deformation areas 322. Therefore, the probability of deformation of the first deformation area 321 is much greater than that of the second deformation areas 322. The design of W1≥K can ensure that the strengthening structure 310 covers the first deformation area 321 in the first direction D1, avoiding the problem of heat-induced deformation of the first deformation area 321. In other embodiments, the explosion-proof valve 100 can also be other shapes, such as circular or fan-shaped, etc.

[0060] Furthermore, the dimension of the explosion-proof valve 100 in the first direction D1 is L2, that is, the sum of the dimensions of the straight section 110 and the two semi-circular sections 120 in the first direction D1 is L2, and W1≤L2. If W1 is greater than L2, the strengthening structure 310 extends beyond the second deformation areas 322 in the first direction D1, which will increase the weight and volume of the housing structure, be unfavorable for improving the energy density of the battery, and at the same time will also increase the production material consumption of the second wall 300, being unfavorable for saving production costs.

[0061] In this embodiment, K ≤ W1 ≤ L2, which can not only improve the structural strength of the first deformation zone 321 and the second deformation zone 322, achieving the effect of improving the welding yield of the explosion-proof valve 100, but also is beneficial to improving the energy density of the battery and saving production costs. It should be noted that when W1 = K, the strengthening structure 310 completely covers the first deformation zone 321 in the first direction D1, but the strengthening structure 310 does not cover the second deformation zone 322 in the first direction D1. Since the second deformation zone 322 is adjacent to the first deformation zone 321 and the strengthening structure 310 completely covers the first deformation zone 321 in the first direction D1, the structural strength of the second deformation zone 322 will also be improved to a certain extent. When punching the explosion-proof hole, the deformation probability of the second deformation zone 322 can still be reduced.

[0062] Optionally, the wall thickness of the first wall 200 is greater than the wall thickness of the second wall 300, and the wall thickness of the first wall 200 is greater than the wall thickness of the third wall 400, so that the structural strength of the first wall 200 is greater than that of the second wall 300 and the third wall 400. When punching the explosion-proof hole on the first wall 200, the punching accuracy of the explosion-proof hole can be improved. And if the easily deformable zone 320 of the second wall 300 undergoes slight deformation, the first wall 200 with greater structural strength can resist the pulling force of the second wall 300 and prevent the edge of the explosion-proof hole from deforming.

[0063] Optionally, the first wall 200 is further provided with a first reinforcing rib 210. The first reinforcing rib 210 is located at the edge of the explosion-proof hole, that is, the first reinforcing rib 210 is located at the edge of the explosion-proof valve 100. The setting of the first reinforcing rib 210 can improve the structural strength of the edge of the explosion-proof hole. When punching the explosion-proof hole, the probability of deformation at the edge of the explosion-proof hole can be reduced, achieving the effect of improving the dimensional accuracy of the explosion-proof hole, and further improving the welding yield of the explosion-proof valve 100.

[0064] Optionally, the number of the first reinforcing ribs 210 is two, and the two first reinforcing ribs 210 are arranged oppositely with respect to the axis of the explosion-proof hole. In this embodiment, the two first reinforcing ribs 210 are arranged oppositely with respect to the short-axis axis of the runway-shaped explosion-proof hole. Of course, in other embodiments, the two first reinforcing ribs 210 can also be arranged oppositely with respect to the long-axis axis of the runway-shaped explosion-proof hole, or the two first reinforcing ribs 210 are arranged oppositely with respect to the axis of the circular explosion-proof hole. This structure in which the two first reinforcing ribs 210 are arranged oppositely with respect to the axis of the explosion-proof hole is beneficial to improving the uniformity of the structural strength of the edge of the explosion-proof hole, and further can improve the uniformity of the welding yield of the explosion-proof valve 100.

[0065] Furthermore, the area of ​​the orthographic projection of each first reinforcement rib 210 on the first wall 200 is S1, and the area of ​​the explosion-proof hole is S2, that is, the area of ​​the explosion-proof valve 100 is S2, S1 / S2≥0.18, and illustratively, S1 / S2 can be 0.18, 0.2 or 0.3, etc., to ensure that the area of ​​the orthographic projection of the first reinforcement rib 210 on the first wall 200 is large enough to improve the structural strength of the edge of the explosion-proof hole.

[0066] Furthermore, S1 / S2≤0.33. For example, S1 / S2 can be 0.33, 0.25 or 0.19. If S1 / S2 is greater than 0.33, S1 is too large, which will cause the structural strength of the edge area of ​​the explosion-proof hole to be too high, and the punching force required for punching the explosion-proof hole will be too high. In addition, the punch flatness and stamping accuracy fluctuations of the stamping equipment will increase, thereby increasing the difficulty and cost of the stamping process.

[0067] In this embodiment, 0.18≤S1 / S2≤0.33 can not only prevent the edge of the explosion-proof hole from being deformed due to the stamping process, but also reduce the difficulty and cost of the stamping process. Of course, in other implementation schemes, S1 / S2≥0.18 and S1 / S2≤0.33 can also be selected. If S1 / S2<0.18, the structural strength of the edge area of ​​the explosion-proof hole will be reduced, and if S1 / S2>0.33, the difficulty and cost of the stamping process will be increased.

[0068] Optionally, the first reinforcing rib 210 is located on the outer surface of the first wall body 200, that is, the first reinforcing rib 210 is located on the side of the first wall body 200 away from the installation cavity 500, thereby forming a structure in which the first reinforcing rib 210 protrudes from the outer surface of the first wall body 200, and the outer surface of the explosion-proof valve 100 (that is, the surface of the explosion-proof valve 100 on the side away from the installation cavity 500) does not protrude from the outer surface of the first wall body 200, that is, the outer surface of the explosion-proof valve 100 is flush with the outer surface of the first wall body 200 or slightly recessed in the outer surface of the first wall body 200. In actual production and application, if there are other components on the side of the explosion-proof valve 100, the first reinforcing rib 210 can prevent the outer surface of the explosion-proof valve 100 from directly colliding or contacting with the other components, thereby protecting the explosion-proof valve 100 and providing a guarantee for the reliability of the use of the explosion-proof valve 100.

[0069] Furthermore, if Figure 8 As shown, the thickness of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is H2, H2≥0.5mm, for example, H2 can be 0.5mm, 0.55mm or 0.6mm, etc., to ensure that the first reinforcing rib 210 protrudes from the outer surface of the first wall 200 by a certain thickness to avoid direct collision or contact between the outer surface of the explosion-proof valve 100 and other components.

[0070] Generally, both stamping equipment and welding equipment are provided with positioning structures. For the convenience of understanding, the positioning structure on the explosion-proof hole stamping equipment is referred to as the first positioning structure herein, and the positioning structure on the explosion-proof valve 100 welding equipment is referred to as the second positioning structure. In this embodiment, the first positioning structure is provided with two first positioning grooves, and the second positioning structure is provided with two second positioning grooves. The two first positioning grooves correspond to the two first reinforcing ribs 210 one by one, and the shape of the first reinforcing rib 210 is adapted to that of the first positioning groove. When stamping the explosion-proof hole, each first reinforcing rib 210 is respectively inserted into a corresponding first positioning groove, and the precise positioning of the punching position of the explosion-proof hole can be achieved; the two second positioning grooves correspond to the two first reinforcing ribs 210 one by one, and the shape of the first reinforcing rib 210 is adapted to that of the second positioning groove. When welding the explosion-proof valve 100, each first reinforcing rib 210 is respectively inserted into a corresponding second positioning groove, and the precise positioning of the welding position of the explosion-proof valve 100 can be achieved.

[0071] It should be noted that the stamping process and welding process mentioned in this embodiment are both relatively mature existing processes in the art, and the specific process flows thereof will not be elaborated herein.

[0072] Optionally, as Figure 3 shown, the orthographic projection of the non-end region of the first reinforcing rib 210 on the first wall body 200 is generally an arc-shaped structure. Compared with a linear structure, the arc-shaped structure has a larger volume, can provide higher support force for the edge region of the explosion-proof hole, and reduce the probability of deformation problems occurring at the edge of the explosion-proof hole; in addition, since the edge of the explosion-proof hole has a certain structural strength, the problem of punch damage during stamping of the explosion-proof hole can be avoided.

[0073] Furthermore, the orthographic projection of the end of the first reinforcing rib 210 on the first wall body 200 is generally circular. Compared with an arc, the circular structure has a longer perimeter, can expand the fitting area between the first reinforcing rib 210 and the inner wall of the first positioning groove and the fitting area between the first reinforcing rib 210 and the inner wall of the second positioning groove, and thus achieve the effect of improving the punching position accuracy of the explosion-proof hole and the welding position accuracy of the explosion-proof valve 100.

[0074] In this embodiment, the reinforcing structure 310 includes a second reinforcing rib 311. The second reinforcing rib 311 and the first reinforcing rib 210 are both made by stamping process. Therefore, a first groove (not shown in the figure) is formed on the inner surface of the first wall body 200 corresponding to the position of the first reinforcing rib 210, and a second groove 312 (as Figure 7As shown). In actual production, stamping a sheet with a uniform wall thickness can form the first reinforcing rib 210 and the second reinforcing rib 311, which is beneficial to reducing the production difficulty and cost. In other embodiments, the reinforcing structure 310 can also be a thickened area, a convex rib, relatively dense convex points or convex blocks, etc.

[0075] Further, the second reinforcing rib 311 is located on the outer surface of the second wall body 300 (i.e., the side of the second wall body 300 facing away from the installation cavity 500), which improves the utilization rate of the internal space of the housing structure to increase the energy density of the battery.

[0076] As Figure 6 shown, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall body 300 satisfies H1≥0.4mm. Exemplarily, H1 can be 0.4mm, 0.45mm or 0.5mm, etc., ensuring that the second reinforcing rib 311 protrudes from the outer surface of the second wall body 300 by a certain thickness, so that the second reinforcing rib 311 has sufficient structural strength to support the easily deformable area 320.

[0077] Optionally, the number of the second reinforcing ribs 311 is more than two. For example, the number of the second reinforcing ribs 311 is two, three or four, etc. More than two second reinforcing ribs 311 are arranged at intervals along the first direction D1, and each second reinforcing rib 311 extends along the second direction D2. If the number of the second reinforcing ribs 311 is one, to avoid the problem of deformation of the easily deformable area 320, it is necessary to make the size of this one second reinforcing rib 311 large enough, especially the size in the first direction D1. When stamping to form the second reinforcing rib 311, a relatively large punching force is required, and the relatively large punching force is likely to cause the second wall body 300 to deform. Therefore, setting the number of the second reinforcing ribs 311 to more than two can reduce the size of each second reinforcing rib 311, especially the size in the first direction D1, and the punching force required for stamping to form the second reinforcing rib 311 is relatively small, which can avoid the problem of deformation of the second wall body 300 when stamping to form the second reinforcing rib 311.

[0078] Optionally, the distance between two adjacent second reinforcing ribs 311 is ≥5mm. For example, the distance between two adjacent second reinforcing ribs 311 can be 5mm, 6mm or 7mm, etc. The area between two adjacent second reinforcing ribs 311 is used to support the punch of the stamping equipment when stamping the second reinforcing rib 311. If the distance is too small, the punch cannot be supported, which will affect the preparation process of the second reinforcing rib 311.

[0079] It should be noted that the dimension W of the above-mentioned strengthening structure 310 extending along the second direction D2 refers to the dimension of the second reinforcing rib 311 extending in the second direction D2; the dimension W1 of the above-mentioned strengthening structure 310 in the first direction D1 refers to the distance between the outermost two second reinforcing ribs 311 among all the second reinforcing ribs 311 on the side facing away from each other in the first direction D1 (as Figure 2 and Figure 7 shown).

[0080]

[0081] Table 1 provides six groups of examples and five groups of comparative examples. The material of the housing structure in the six groups of examples and the five groups of comparative examples is imported aluminum alloy MXF2, and the laser welding power when welding the explosion-proof valve 100 at the explosion-proof hole is 1050W.

[0082] In Example 1, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two sides of the two second walls 300 facing away from each other is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 25 mm, and the distance W1 between the outermost two second reinforcing ribs 311 among all the second reinforcing ribs 311 on the side facing away from each other in the first direction D1 is 50 mm. The area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 166.7 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.18, W / L1 is 1.04. After punching the explosion-proof hole on the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no over-tolerance concavity appears in the easily deformable area 320 of the second wall 300 (that is, the concavity dimension in the easily deformable area 320 is less than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium detection test of the welded explosion-proof valve 100 (that is, the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0083] In Embodiment 2, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall body 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall body 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second wall bodies 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 26 mm, among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm, the area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall body 200 is 185.22 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.2, W / L1 is 1.08. After stamping the explosion-proof hole on the first wall body 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no excessive concave (i.e., the concave dimension of the deformable area 320 is less than 0.3 mm) appears in the deformable area 320 of the second wall body 300, the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium leak detection test of the welding of the explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0084] In Embodiment 3, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall body 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall body 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second wall bodies 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 27 mm, among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 52 mm, the area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall body 200 is 203.74 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.22, W / L1 is 1.13. After stamping the explosion-proof hole on the first wall body 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no excessive concave (i.e., the concave dimension of the deformable area 320 is less than 0.3 mm) appears in the deformable area 320 of the second wall body 300, the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium leak detection test of the welding of the explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0085] In Embodiment 4, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 28 mm. Among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm, the area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 231.53 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.25, W / L1 is 1.17. After stamping the explosion-proof hole on the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no excessive concave occurs in the deformable area 320 of the second wall 300 (that is, the concave dimension in the deformable area 320 is less than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium leak detection test of the welded explosion-proof valve 100 (that is, the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0086] In Embodiment 5, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 29 mm. Among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm, the area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 277.83 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.3, W / L1 is 1.21. After stamping the explosion-proof hole on the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no excessive concave occurs in the deformable area 320 of the second wall 300 (that is, the concave dimension in the deformable area 320 is less than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium leak detection test of the welded explosion-proof valve 100 (that is, the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0087] In Embodiment 6, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 30 mm, and among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 58 mm. The area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 305.61 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.33, and W / L1 is 1.25. After stamping the explosion-proof hole on the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no out-of-tolerance concavity appears in the deformable area 320 of the second wall 300 (i.e., the concavity dimension in the deformable area 320 is less than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium leak detection test of the welded explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0088] In Comparative Example 1, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 22 mm, and among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm. The area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 203.74 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.22, and W / L1 is 0.92. After stamping the explosion-proof hole on the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, out-of-tolerance concavity appears in the deformable area 320 of the second wall 300 (i.e., the concavity dimension in the deformable area 320 is greater than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and the qualification rate of both the helium leak detection test of the welded explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure is less than 98%.

[0089] In Comparative Example 2, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 23 mm, among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm, the area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 203.74 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.22, W / L1 is 0.96. After punching the explosion-proof hole in the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, an out-of-tolerance concave (i.e., the concave dimension in the deformable area 320 is greater than 0.3 mm) appears in the deformable area 320 of the second wall 300. The punching accuracy of the explosion-proof hole is greater than 99%, and the qualified rates of the helium leak detection test of the welded explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure are less than 98%.

[0090] In Comparative Example 3, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the two opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 26 mm, among all the second reinforcing ribs 311, the distance W1 between the two opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm, the area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 129.65 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.14, W / L1 is 1.08. After punching the explosion-proof hole in the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no out-of-tolerance concave (i.e., the concave dimension in the deformable area 320 is less than 0.3 mm) appears in the deformable area 320 of the second wall 300. The punching accuracy of the explosion-proof hole is less than 98%, and the qualified rates of the helium leak detection test of the welded explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure are less than 98%.

[0091] In Comparative Example 4, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 26 mm, and among all the second reinforcing ribs 311, the distance W1 between the opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm. The area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 153.18 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.165, W / L1 is 1.08. After punching the explosion-proof hole in the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, no excessive concave deformation occurred in the easily deformable area 320 of the second wall 300 (i.e., the concave dimension in the easily deformable area 320 is less than 0.3 mm), the punching accuracy of the explosion-proof hole is less than 98%, and the qualified rates of the helium leak detection test of the explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure are less than 98%.

[0092] In Comparative Example 5, the thickness H1 of the second reinforcing rib 311 protruding from the outer surface of the second wall 300 is 0.4 mm, the thickness H2 of the first reinforcing rib 210 protruding from the outer surface of the first wall 200 is 0.6 mm, the distance L1 between the opposite sides of the two second walls 300 is 24 mm, the dimension L2 of the explosion-proof valve 100 in the first direction D1 is 65 mm, the dimension W of the second reinforcing rib 311 extending in the second direction D2 is 24 mm, and among all the second reinforcing ribs 311, the distance W1 between the opposite sides of the two outermost second reinforcing ribs 311 in the first direction D1 is 54 mm. The area S1 of the orthographic projection of the first reinforcing rib 210 on the first wall 200 is 231.53 mm2, the area S2 of the explosion-proof hole is 926.1 mm2, S1 / S2 is 0.25, W / L1 is 1.0. After punching the explosion-proof hole in the first wall 200 and welding the explosion-proof valve 100 at the explosion-proof hole, excessive concave deformation occurred in the easily deformable area 320 of the second wall 300 (i.e., the concave dimension in the easily deformable area 320 is greater than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and the qualified rates of the helium leak detection test of the explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure are less than 98%.

[0093] In summary, when 0.18 ≤ S1 / S2 ≤ 0.33, 1.04 ≤ W / L1 < 1.3, H1 ≥ 0.4 mm, and H2 ≥ 0.5 mm, after stamping an explosion-proof hole on the first wall body 200 and welding an explosion-proof valve 100 at the explosion-proof hole, no out-of-tolerance concavity appears in the easily deformable area 320 of the second wall body 300 (i.e., the concavity size in the easily deformable area 320 is less than 0.3 mm), the punching accuracy of the explosion-proof hole is greater than 99%, and both the helium leak detection test for welding the explosion-proof valve 100 (i.e., the sealing test between the explosion-proof valve 100 and the hole wall of the explosion-proof hole) and the appearance inspection of the housing structure meet the technical requirements.

[0094] This embodiment also provides a battery, as Figure 9 shown. The battery includes a battery cell group, a cover plate 20, and the above-mentioned housing structure 10. Among them, the battery cell group is disposed in the installation cavity 500, and the cover plate 20 covers the opening of the installation cavity 500. The battery adopts the above-mentioned housing structure 10. When stamping an explosion-proof hole on the first wall body 200 of the housing structure 10 and welding an explosion-proof valve 100 at the explosion-proof hole, the probability of deformation problems occurring in the easily deformable area 320 of the second wall body 300 is relatively low. Furthermore, the welding yield of the explosion-proof valve 100 can be improved, providing a guarantee for the sealing between the explosion-proof valve 100 and the explosion-proof hole. Also, because the probability of deformation problems occurring in the easily deformable area 320 of the second wall body 300 is relatively low, when the battery cell group is installed into the housing structure 10, the probability of interference between the battery cell group and the second wall body 300 is relatively low, enabling the battery cell group to be installed into the housing structure 10 more smoothly and avoiding the problem of the second wall body 300 scratching the battery cell group, thereby improving the installation efficiency and installation yield of the battery cell group.

[0095] Compared with the case where the explosion-proof valve 100 is disposed on the cover plate 20 at the end of the housing structure 10, in this embodiment, the explosion-proof valve 100 is disposed on the housing structure 10. When the explosion-proof valve 100 explodes and exhausts gas, the path for the gas in the installation cavity 500 to flow to the explosion-proof valve 100 is shorter, which is beneficial to quickly discharging the high-pressure gas in the installation cavity 500, having the effect of improving the use safety of the battery.

[0096] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Shell structure, characterized in that, include: Explosion-proof valve (100); A first wall body (200), wherein the first wall body (200) is provided with an explosion-proof hole, and the explosion-proof valve (100) is sealed at the explosion-proof hole; A second wall body (300), the second wall body (300) is connected to the first wall body (200), and the edge at which the second wall body (300) is connected to the first wall body (200) is parallel to the first direction (D1), a reinforcement structure (310) is provided on the side of the second wall body (300) facing the first wall body (200), the reinforcement structure (310) is located in the middle of the second wall body (300) in the first direction (D1), and the explosion-proof valve (100) is located in the middle of the first wall body (200) in the first direction (D1).

2. The housing structure according to claim 1, characterized in that: The reinforcing structure (310) extends along a second direction (D2), wherein the second direction (D2) is parallel to the surface of the second wall (300) and perpendicular to the first direction (D1).

3. The housing structure according to claim 2, characterized in that: The number of the second walls (300) is two, and the two second walls (300) are arranged opposite to each other along a third direction (D3), and the first direction (D1) and the second direction (D2) are both perpendicular to the third direction (D3).

4. The housing structure according to claim 3, characterized in that: The dimension of the reinforcing structure (310) extending along the second direction (D2) is W, and the distance between the two sides of the second walls (300) facing away from each other is L1; W / L1≥1.04; And / or, W / L1<1.

3.

5. The housing structure according to any one of claims 1 to 4, characterized in that: The explosion-proof valve (100) is runway-shaped, comprising a straight area (110) and two semicircular areas (120), the two semicircular areas (120) being symmetrically arranged about the straight area (110) along the first direction (D1), the size of the straight area (110) in the first direction (D1) being K, the size of the reinforcement structure (310) in the first direction (D1) being W1, and W1≥K.

6. The housing structure according to any one of claims 1 to 4, characterized in that: The first wall body (200) is also provided with a first reinforcing rib (210), and the first reinforcing rib (210) is located at the edge of the explosion-proof hole.

7. The housing structure according to claim 6, characterized in that: The number of the first reinforcing ribs (210) is two, and the two first reinforcing ribs (210) are arranged opposite to each other about the axis of the explosion-proof hole.

8. The housing structure according to claim 7, characterized in that: The area of ​​the orthographic projection of each of the first reinforcing ribs (210) on the first wall (200) is S1, and the area of ​​the explosion-proof hole is S2; S1 / S2 ≥ 0.18; And / or, S1 / S2≤0.

33.

9. The housing structure according to claim 6, characterized in that: The first reinforcing rib (210) is located on the outer surface of the first wall (200), and the outer surface of the explosion-proof valve (100) does not protrude from the outer surface of the first wall (200).

10. A battery, characterized in that It comprises a pole group and a shell structure (10) according to any one of claims 1 to 9, wherein the shell structure is provided with a mounting cavity (500), and the pole group is arranged in the mounting cavity (500).

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