Battery pack lower box body and battery pack

Abstract

The utility model provides a battery pack lower box body and a battery pack, and belongs to the technical field of battery manufacturing. The battery pack lower box body comprises a bottom plate and peripheral side plates, a front side plate, a rear side plate, a left side plate and a right side plate in the peripheral side plates are arranged in parallel, the length of the left side plate and the length of the right side plate are larger than the length of the front side plate and the length of the rear side plate, and at least one side plate of the left side plate and the right side plate is provided with a concave structure which is concave inwards in the left-right direction and extends in the front-back direction. The width of the inward-concave structure in the vertical direction is not smaller than half of the height of the side plate where the inward-concave structure is located, at least two fixing blocks arranged at intervals in the front-back direction are fixed in the inward-concave structure, and fixing holes used for being fixedly connected with a frame are formed in the fixing blocks. The weight of the side plates can be reduced, the energy density of the battery pack is improved, and meanwhile it is guaranteed that the lower box body can be normally fixed to a vehicle frame.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery pack lower box and battery pack belong to battery manufacturing technical field. BACKGROUND

[0002] The battery pack comprises a box body and a battery module arranged in the box body, and the box body usually comprises an upper box body and a lower box body, for example, a double-layer battery box structure and a double-layer battery disclosed in a Chinese patent application for invention with the application publication No. CN117878478A, wherein the double-layer battery box comprises an upper box body and a lower box body, the lower box body is provided with a lower liquid cooling plate (the lower liquid cooling plate constitutes a bottom plate of the lower box body) at the bottom, and an upper liquid cooling plate is mounted at the top opening of the lower box body, the upper box body is sealingly and detachably arranged above the lower box body, and the upper liquid cooling plate and the lower box body and the upper box body and the upper liquid cooling plate are all surrounded to form a containing space for containing the battery module.

[0003] The lower box body has four peripheral side plates, and since the lower box body is a cuboid structure, the front and rear side plates in the four peripheral side plates are arranged in parallel, the left and right side plates are arranged in parallel, and the length of the left and right side plates is greater than the length of the front and rear side plates, wherein the front side plate is usually provided with positive and negative connectors, a BMS, indicator lights and other devices, and the left and right side plates are used as side plates for directly fixing the battery box between the frame girders, and a plurality of fixing holes are arranged on the left and right side plates respectively (which can be obviously seen from the drawings of the patent document CN117878478A).

[0004] However, the wall thickness of the peripheral side plates of the existing lower box body is basically equal, especially for the left and right side plates with a larger length, and such a structure leads to a relatively large weight of the side plates, and further leads to a relatively low energy density of the battery pack. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a battery pack lower box to solve the problem that the left and right side plates with a larger length in the existing battery pack lower box are all side plates with equal wall thickness, which leads to a relatively large weight of the side plates and a relatively low energy density of the battery pack, and the utility model also aims to provide a battery pack to solve the above problem.

[0006] To achieve the above-mentioned purpose, the battery pack lower box in the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of battery pack lower box, including bottom plate and four around side plates, front, rear side plates and left, right side plates in four around side plates are arranged in parallel respectively, and the length of left, right side plates is greater than the length of front, rear side plates, at least one side plate of left, right side plates is provided with the recessed structure that is recessed inward along left and right direction and extends along front and back direction, the width of recessed structure in up and down direction is not less than half of the height of the side plate, at least two fixed blocks are fixed in recessed structure and are arranged along front and back direction, fixed hole for being fixedly connected with vehicle frame is provided on fixed block.

[0008] The beneficial effects of the above technical solution are that the utility model belongs to an improved invention, further limits the structure of the left side plate or / and the right side plate of the lower box, specifically, at least one side plate of the left and right side plates is provided with a recessed structure that is recessed inward along the left and right directions and extends along the front and back directions, the width of the recessed structure in the up and down directions is not less than half of the height of the side plate, which can reduce the weight of the side plate compared to the side plate with equal wall thickness. At the same time, at least two fixed blocks are fixed in the recessed structure and are arranged along the front and back directions, and fixed holes for being fixedly connected with the vehicle frame are provided on the fixed blocks, which ensures that the lower box can be normally fixed to the vehicle frame, avoids the setting of the relatively wide recessed structure from affecting the normal installation of the battery pack due to the inability to set the fixed holes, and since the recessed structure extends along the front and back directions and the up and down width is not less than half of the height of the side plate, the fixed blocks are not affected by too much weight of the side plate, and the overall side plate is lighter than the prior art, thus the energy density of the battery pack can be improved.

[0009] Further, at least two fixed plates are fixed in the recessed structure, the fixed plates are arranged one by one outside the fixed blocks, and through holes are provided on the fixed plates to expose the fixed blocks and the fixed holes on the fixed blocks.

[0010] Further, the inner wall of the recessed structure includes a vertical bottom wall, an upper side wall and a lower side wall, and the fixed plates are fixed with the vertical bottom wall, the upper side wall and the lower side wall of the recessed structure, respectively.

[0011] Further, the included angles between the vertical bottom wall and the upper side wall and between the vertical bottom wall and the lower side wall are obtuse angles, and the upper and lower ends of the fixed plates are respectively provided with inclined surfaces that fit the upper side wall and the lower side wall.

[0012] Further, the fixed blocks have penetration ends that penetrate the through holes, and the penetration ends are welded and fixed with the fixed plates.

[0013] Further, the fixed plate is a U-shaped plate, which includes a vertical plate arranged vertically and having a plate thickness extending along the left and right directions, and connecting plates connected to the left and right ends of the vertical plate and arranged in parallel, the edges of the connecting plates and the vertical plate are respectively fixed with the inner wall of the recessed structure, and the through holes are provided on the vertical plate.

[0014] Further, a lifting hole for the hook to hook into is arranged on the vertical plate.

[0015] Further, the inner recess structure penetrates the side plate along the front-rear direction.

[0016] Further, a center weight-reducing hole is arranged at the center of the fixing block, at least three fixing holes are uniformly arranged around the center weight-reducing hole, and a peripheral weight-reducing hole is further arranged between the adjacent two fixing holes on the fixing block.

[0017] To achieve the above object, the battery pack in the utility model adopts the following technical scheme:

[0018] A battery pack comprises a box body and a battery module arranged in the box body, the box body comprises an upper box body and a lower box body, the lower box body comprises a bottom plate and four side plates, the front and rear side plates and the left and right side plates in the four side plates are arranged in parallel respectively, the length of the left and right side plates is greater than that of the front and rear side plates, at least one side plate of the left and right side plates is provided with an inner recess structure which is recessed inward along the left-right direction and extends along the front-rear direction, the width of the inner recess structure in the up-down direction is not less than half of the height of the side plate, at least two fixing blocks which are arranged at intervals along the front-rear direction are fixed in the inner recess structure, and a fixing hole for fixed connection with a vehicle frame is arranged on the fixing block.

[0019] The beneficial effects of the above technical scheme are as follows: the utility model belongs to an improved invention, the structure of the lower box body is further limited, specifically, at least one side plate of the left and right side plates is provided with an inner recess structure which is recessed inward along the left-right direction and extends along the front-rear direction, the width of the inner recess structure in the up-down direction is not less than half of the height of the side plate, so that compared with the side plate with equal wall thickness, the weight of the side plate can be reduced. Meanwhile, at least two fixing blocks which are arranged at intervals along the front-rear direction are fixed in the inner recess structure, and a fixing hole for fixed connection with a vehicle frame is arranged on the fixing block, so that the lower box body can be normally fixed to the vehicle frame, and the setting of the inner recess structure which is relatively wide up and down does not affect the setting of the fixing hole and the normal installation of the battery pack. Since the inner recess structure extends along the front-rear direction and the up-down width is not less than half of the height of the side plate, the fixed fixing blocks do not affect the weight of the side plate too much, the overall side plate is lighter than the prior art, and therefore the energy density of the battery pack can be improved.

[0020] Further, at least two fixing plates are further fixed in the inner recess structure, the fixing plates are arranged one by one outside the fixing blocks, and a through hole is arranged on the fixing plate and penetrates the fixing plate to expose the fixing blocks and the fixing holes on the fixing blocks.

[0021] Further, the inner wall of the inner recess structure comprises a vertical bottom wall, an upper side wall and a lower side wall, and the fixing plates are fixed with the vertical bottom wall, the upper side wall and the lower side wall of the inner recess structure respectively.

[0022] Further, the included angle between the vertical bottom wall and the upper side wall and the included angle between the vertical bottom wall and the lower side wall are obtuse angles, and the upper and lower ends of the fixing plate are respectively provided with inclined surfaces abutting the upper side wall and the lower side wall.

[0023] Further, the fixing block has a penetrating end penetrating the through hole, and the penetrating end is welded to the fixing plate.

[0024] Further, the fixing plate is a U-shaped plate, and the fixing plate comprises a vertical plate arranged vertically and having a plate thickness extending in the left-right direction, and a connecting plate connected to the left and right ends of the vertical plate and arranged in parallel, edges of the connecting plate and the vertical plate are respectively fixed to the inner walls of the inner recessed structure, and the through hole is arranged on the vertical plate.

[0025] Further, the vertical plate is further provided with a lifting hole for hooking of a lifting hook.

[0026] Further, the inner recessed structure penetrates the side plate in the front-rear direction.

[0027] Further, the center of the fixing block is provided with a center weight-reducing hole, at least three fixing holes are uniformly arranged around the center weight-reducing hole, and an outer peripheral weight-reducing hole is further arranged between the adjacent two fixing holes on the fixing block. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a perspective view of a lower box body of a battery pack according to an embodiment of the present application;

[0029] Figure 2 is a partial enlarged view of Figure 1

[0030] Figure 3 is a side view of a lower box body of a battery pack according to an embodiment of the present application;

[0031] Figure 4 is a partial enlarged view of Figure 3

[0032] In the figure: 1, bottom plate; 2, front side plate; 3, rear side plate; 4, left side plate; 41, left inner recessed structure; 5, right side plate; 51, right inner recessed structure; 511, vertical bottom wall; 512, upper side wall; 513, lower side wall; 52, positioning protrusion; 6, fixing block; 61, fixing hole; 62, center weight-reducing hole; 63, outer peripheral weight-reducing hole; 7, fixing plate; 71, vertical plate; 72, connecting plate; 73, lifting hole. DETAILED DESCRIPTION

[0033] ​​In view of the technical problems existing in the prior art, the basic concept of this utility model is to set a concave structure on the left side plate and / or right side plate of the lower housing to reduce the weight of the side plate and improve the energy density of the battery pack. The concave structure has a certain vertical width. In order to enable the lower housing to be properly fixed to the vehicle frame, a fixing block is set in the concave structure and a fixing hole is set on the fixing block.

[0034] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0035] Example 1 of the lower housing of the battery pack in this utility model:

[0036] like Figure 1 As shown, the lower battery pack housing includes a base plate 1 and four side plates. The four side plates are a front side plate 2, a rear side plate 3, a left side plate 4, and a right side plate 5. The front and rear side plates are arranged in parallel, and the left and right side plates are arranged in parallel. The length of the left and right side plates is greater than the length of the front and rear side plates. The entire lower housing has a cuboid structure. The front side plate 2 is used to install positive and negative connectors, BMS, indicator lights, and other devices. The left side plate 4 and right side plate 5 are used to directly fix the battery pack to the frame beams.

[0037] In this utility model, both the left side plate 4 and the right side plate 5 are provided with concave structures that are recessed inward in the left-right direction and extend in the front-back direction, such as... Figure 3 As shown, the left side plate 4 has a left concave structure 41, and the right side plate 5 has a right concave structure 51. The concave structures on both sides are the same size and are structurally symmetrical. The left concave structure 41 extends through the left side plate 4 in the front-to-back direction, and the right concave structure 51 extends through the right side plate 5 in the front-to-back direction, thus reducing the weight of the left side plate 4 and the right side plate 5. Furthermore, both the left side plate 4 and the right side plate 5 are made of aluminum profiles, making them relatively lightweight.

[0038] The width of the left concave structure 41 in the vertical direction is greater than half the height of the left side plate 4, and the width of the right concave structure 51 in the vertical direction is greater than half the height of the right side plate 5. Specifically, in this embodiment, the width of the left concave structure 41 in the vertical direction is almost equal to the height of the left side plate 4, and the width of the right concave structure 51 in the vertical direction is also almost equal to the height of the right side plate 5. The lower ends of the left side plate 4 and the right side plate 5 only leave a part of the side with a height equal to the thickness of the bottom plate 1. The height of the side left at the upper end is smaller than that left at the lower end. The rest of the part is a concave structure, which greatly reduces the weight of the left side plate 4 and the right side plate 5.

[0039] Due to the fact that the left side plate 4 and the right side plate 5 are almost entirely concave on the side surface, in order to ensure that the lower box body can be normally fixed between the girders of the vehicle frame, at least two fixing blocks 6 are fixed in the concave structure of the left side plate 4 and the right side plate 5 respectively and are arranged in the front-rear direction, the specific number of the fixing blocks 6 is determined according to the actual length of the left side plate 4 and the right side plate 5, and in the embodiment, there are three fixing blocks 6 on a single side plate, and each fixing block 6 is provided with a fixing hole for fixed connection with the vehicle frame. At the same time, in order to improve the structural strength of the left side plate 4 and the right side plate 5 and improve the fixing effect of the fixing blocks 6, at least two fixing plates 7 are respectively fixed in the concave structure of the left side plate 4 and the right side plate 5, the fixing plates 7 are arranged outside the fixing blocks 6 one by one and are fixedly connected with the fixing blocks 6, and the fixing plates 7 are provided with through holes penetrating through the fixing plates 7 to expose the fixing blocks 6 and the fixing holes on the fixing blocks 6, thereby facilitating the connection with the vehicle frame.

[0040] Specifically, taking the right side plate 5 as an example, as shown in Figure 2 and Figure 4 the inner wall of the right concave structure 51 includes a vertical bottom wall 511, an upper side wall 512 and a lower side wall 513, and the fixing plates 7 are fixed with the vertical bottom wall 511, the upper side wall 512 and the lower side wall 513 of the right concave structure 51 respectively, which is more secure and can better improve the structural strength of the right side plate 5. Further, the included angle between the vertical bottom wall 511 and the upper side wall 512 and the included angle between the vertical bottom wall 511 and the lower side wall 513 are obtuse angles, which are 120 degrees in the embodiment, so that the upper and lower side walls of the concave structure form a flared structure, which can facilitate the installation of the fixing plates 7. Moreover, the upper and lower ends of the fixing plates 7 are respectively provided with inclined surfaces abutting against the upper side wall 512 and the lower side wall 513, so that the upper and lower ends of the fixing plates 7 are adapted to the shape of the upper side wall 512 and the lower side wall 513, facilitating fixed connection, and in the embodiment, the fixing plates 7 are fixed into the concave structure by welding.

[0041] Further, the fixing plates 7 in the embodiment are not solid plates to minimize the weight. Specifically, the fixing plates 7 are U-shaped plates, the fixing plates 7 include a vertical plate 71 arranged vertically and having a plate thickness extending in the left-right direction, and a connecting plate 72 connected to the left and right ends of the vertical plate 71 and arranged in parallel, the edges of the connecting plate 72 and the vertical plate 71 are respectively fixed with the inner wall of the right concave structure 51, that is, the upper and lower edges of the connecting plate 72 are respectively welded and fixed with the upper side wall 512 and the lower side wall 513, the vertical edge of the connecting plate 72 between the upper and lower edges is welded and fixed with the vertical bottom wall 511, and the upper and lower edges of the vertical plate 71 are respectively welded and fixed with the upper side wall 512 and the lower side wall 513.

[0042] The through hole for exposing the fixing block 6 and the fixing hole on the fixing block 6 is arranged on the vertical plate 71, the shape and size of the through hole are consistent with the outer dimensions of the fixing block 6, and in the embodiment, the width of the fixing plate 7 in the left-right direction is smaller than the depth of the right inner recess structure 51 in the left-right direction, so that the fixing block 6 has a penetrating end penetrating the through hole, and the penetrating end is welded and fixed with the vertical plate 71, so that welding is performed along the edge of the penetrating end, facilitating the welding operation. The vertical end surface of the fixing block 6 is flush with the end surface of the rightmost side of the entire right plate 5, which is the same as arranging the fixing hole on the flat plate in the prior art.

[0043] The fixing block 6 is roughly square structure, the four corners are all arc transitions, and the middle part of each outer side is recessed, and the material of the fixing block 6 is aluminum, so that the weight of the fixing block 6 can be reduced. Four fixing holes 61 are arranged at the four corners of the fixing block 6, and a center weight-reducing hole 62 is arranged at the center of the fixing block 6, and the four fixing holes 61 are uniformly arranged around the center weight-reducing hole 62. At the same time, a peripheral weight-reducing hole 63 is arranged between the adjacent two fixing holes 61 on the fixing block 6, so that the weight of the fixing block 6 is reduced to the maximum extent, and the influence on the energy density of the battery pack is avoided. In addition, each fixing hole 61 is a threaded hole, and considering that the fixing block 6 is made of aluminum, it is not convenient to process the threaded hole, so the light hole can be processed first, and then the steel wire sleeve is embedded in the light hole, and the steel wire sleeve is used to provide the threaded hole.

[0044] In addition, the vertical plate 71 is also provided with a lifting hole 73 for hooking the lifting hook, and the lifting hole 73 is located below the fixing block 6. Since the fixing plate 7 is a U-shaped plate structure, it is equivalent to being hollow inside, so only a hole needs to be opened on the vertical plate 71, which can be used as a lifting hole for hooking the lifting hook, thereby facilitating the lifting of the lower box body.

[0045] When the battery pack lower box is manufactured, after the four peripheral side plates of the lower box and the bottom plate 1 are welded and fixed, first, a groove is opened on the bottom wall of the inner recess structure of the left plate 4 and the right plate 5 (of course, the groove can also be opened before the left plate 4 and the right plate 5 are welded and fixed with the bottom plate 1), the outer contour shape of the groove is consistent with the outer contour shape of the fixing block 6, and the depth of the groove is only a few millimeters, as long as the end part of the fixing block 6 can be inserted into the groove. In addition, the groove is an annular groove, and the center forms a positioning protrusion 52 (the positioning protrusion 52 is not shown in the figure) Figure 4As shown in the figure), the positioning protrusion 52 can be just inserted into the center weight-reducing hole 62 to realize the positioning of the fixing block 6. After the fixing block 6 is installed to the bottom wall of the inner recess structure, the fixing between the fixing block 6 and the inner recess structure is realized by welding. Then the fixing plate 7 is installed, the edges of the fixing plate 7 are respectively attached to the vertical bottom wall 511, the upper side wall 512 and the lower side wall 513 of the inner recess structure, the end of the fixing block 6 is passed through the through hole of the fixing plate 7, then the fixing plate 7 is welded and fixed with the inner wall of the inner recess structure, and the passed end of the fixing block 6 is welded and fixed with the fixing plate 7, that is, the installation of the fixing block 6 and the fixing plate 7 is completed.

[0046] In the utility model, the inner recess structure on the left and right side plates penetrates the side plates in the front-rear direction, and the width of the inner recess structure is sufficient, which can reduce the weight of the left and right side plates. Meanwhile, the fixing block 6 is arranged at intervals, and the fixing plate 7 is equivalent to a hollow structure, which does not affect the weight of the side plates too much. The overall side plate is greatly reduced compared with the prior art, and the energy density of the battery pack can be improved.

[0047] In other embodiments of the battery pack lower box body: the fixing block can be provided with only the center weight-reducing hole, and no peripheral weight-reducing hole, of course, it can be provided with only the peripheral weight-reducing hole, and no center weight-reducing hole, and of course, it can be provided with neither the center weight-reducing hole nor the peripheral weight-reducing hole.

[0048] In other embodiments of the battery pack lower box body: the number of fixing holes can also be three or six, of course, it can also be two. In addition, when the fixing block is made of steel, the fixing hole can be directly machined on the fixing block.

[0049] In other embodiments of the battery pack lower box body: the inner recess structure can be provided only on the left side plate, or only on the right side plate.

[0050] In other embodiments of the battery pack lower box body: the inner recess structure does not penetrate the side plate in the front-rear direction, of course, in order to ensure the weight-reducing effect, the length of the inner recess structure in the front-rear direction can be almost equal to the length of the side plate, and only one edge is left at each of the front and rear ends, so that the inner recess structure does not penetrate.

[0051] In other embodiments of the battery pack lower box body: the fixing plate can no longer be provided with the lifting hole, but the lifting hole is provided at other positions, for example, another lifting block is fixed in the inner recess structure of the left and right side plates, the lifting hole is provided on the lifting block, and of course, if the space permits, the lifting hole can also be provided on the front and rear side plates.

[0052] In other embodiments of the battery pack lower box body: the fixing plate can be a solid plate, at this time, the hollow structure on the fixing plate can only have the through hole for exposing the fixing block, and of course, under the premise of having the through hole, the lifting hole can also be provided.

[0053] In other embodiments of the battery pack lower box: the end face of the fixing block and the end face of the fixing plate can be flush, that is, the fixing block no longer penetrates the through hole on the fixing plate, at this time the vertical end face of the fixing plate and the vertical end face of the side plate where it is located are also flush, that is, the width of the fixing plate in the left-right direction is equal to the depth of the inner recess structure in the left-right direction.

[0054] In other embodiments of the battery pack lower box: the included angle between the vertical bottom wall and the upper side wall and the included angle between the vertical bottom wall and the lower side wall can both be 90 degrees, that is, the vertical bottom wall is perpendicular to the upper side wall and the lower side wall respectively, at this time the upper and lower end faces of the fixing plate are both horizontal planes.

[0055] In other embodiments of the battery pack lower box: regardless of whether the vertical bottom wall is perpendicular to the upper side wall and the lower side wall, the fixing plate can be fixed only with the vertical bottom wall, for example, the upper and lower heights of the fixing plate are slightly smaller, and do not contact the upper and lower side walls of the inner recess structure at all, so they are no longer fixed with them.

[0056] In other embodiments of the battery pack lower box: the fixing method between the fixing plate and the inner wall of the inner recess structure can also be screw connection, for example, when the fixing plate is a solid plate, it is directly fixed and connected with the vertical bottom wall of the inner recess structure by screwing through the fixing plate, when the fixing plate is a U-shaped plate, a fixing flange can be provided on the edge of the fixing plate, the fixing flange is attached to the inner wall of the inner recess structure and is fixed on the inner wall of the inner recess structure by screwing.

[0057] In other embodiments of the battery pack lower box: the fixing plate can no longer be provided, and the fixing block is directly fixed to the vertical bottom wall of the inner recess structure.

[0058] In other embodiments of the battery pack lower box: according to the actual length of the left side plate and the right side plate, the number of fixing blocks on a single side plate can also be four, five or more, but in order to ensure the fixing effect, there should be at least two.

[0059] In other embodiments of the battery pack lower box: the width of the inner recess structure in the up-down direction can also be two-thirds, four-thirds or five-fourths of the height of the side plate where it is located, but it should at least be equal to one-half of the height of the side plate where it is located, in order to ensure that the inner recess structure has sufficient width in the up-down direction, achieving the purpose of weight reduction and improving the energy density of the battery pack.

[0060] In the embodiments of the battery pack in the utility model: the battery pack comprises a box body and a battery module arranged in the box body, the box body comprises an upper box body and a lower box body, the lower box body is the same as the battery pack lower box of any of the above embodiments, and will not be repeated here.

[0061] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and the patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A battery pack lower case comprising a bottom plate and four surrounding side plates, front and rear side plates and left and right side plates of the four surrounding side plates being arranged in parallel respectively, and the length of the left and right side plates being greater than the length of the front and rear side plates, characterized in that, At least one of the left and right side plates is provided with an inward recess structure recessed inward in the left-right direction and extending in the front-rear direction, the width of the inward recess structure in the up-down direction is not less than half of the height of the side plate, and at least two fixing blocks are fixed in the inward recess structure and arranged in the front-rear direction.

2. The battery pack lower case according to claim 1, characterized by, At least two fixing plates are also fixed in the inward recess structure, the fixing plates are arranged one by one outside the fixing blocks, and the fixing plates are provided with through holes penetrating through the fixing plates to expose the fixing blocks and the fixing holes on the fixing blocks.

3. The battery pack lower case according to claim 2, characterized by, The inner wall of the inward recess structure includes a vertical bottom wall, an upper side wall and a lower side wall, and the fixing plates are fixed with the vertical bottom wall, the upper side wall and the lower side wall of the inward recess structure respectively.

4. The battery pack lower case according to claim 3, characterized by, The included angle between the vertical bottom wall and the upper side wall and the included angle between the vertical bottom wall and the lower side wall are both obtuse angles, and the upper and lower ends of the fixing plates are respectively provided with inclined surfaces abutting with the upper side wall and the lower side wall.

5. The battery pack lower case according to any one of claims 2 to 4, characterized by, The fixing blocks have penetrating ends penetrating through the through holes, and the penetrating ends are welded with the fixing plates.

6. The battery pack lower case according to any one of claims 2 to 4, characterized by The fixing plate is a U-shaped plate, which includes a vertical plate arranged vertically and having a plate thickness extending in the left-right direction, and connecting plates connected to the left and right ends of the vertical plate and arranged in parallel, the edges of the connecting plates and the vertical plate are fixed with the inner wall of the inward recess structure, and the through holes are arranged on the vertical plate.

7. The battery pack lower case according to claim 6, characterized by, The vertical plate is also provided with a lifting hole for a lifting hook to hook into.

8. The battery pack lower case according to any one of claims 1 to 4, characterized by, The inward recess structure penetrates through the side plate in the front-rear direction.

9. The battery pack lower case according to any one of claims 1 to 4, characterized by, The center of the fixing block is provided with a center weight-reducing hole, and the fixing holes are arranged at least three around the center weight-reducing hole, and the fixing block is also provided with a peripheral weight-reducing hole between the adjacent two fixing holes.

10. A battery pack comprising a case and a battery module disposed in the case, the case comprising an upper case and a lower case, characterized by, The lower box body is the battery pack lower box body according to any one of claims 1-9.

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