Battery box with high energy density

Abstract

The invention discloses a high-energy-density battery box which comprises a box body frame, a liquid cooling plate is mounted at the bottom of the box body frame, and a plurality of protective plates are mounted below the liquid cooling plate; a top cover plate is mounted at the top of the box body frame; a box body inner cavity for accommodating the battery cell module is formed between the top cover plate and the liquid cooling plate; the box body frame is composed of a plurality of frames, at least one side frame on the box body frame is a side vertical assembly frame, at least one side of the top cover plate is provided with a side cover plate, and the side cover plate corresponds to the side vertical assembly frame; the outer side vertical face of the side vertical assembling frame is an assembling face matched with the side cover plate, and the side cover plate is correspondingly attached to the outer side vertical face in a covering mode. The box body frame is a square frame, frames on the left side and the right side of the box body frame are side-standing assembling frames, and panels are installed on the front side and the rear side of the box body frame. The upper contour surface of the panel is an assembly surface matched with the top cover plate, and the side contour surface of the panel is an assembly surface matched with the side cover plate. The energy density of the battery box can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery boxes, and in particular to a battery box with high energy density. Background Art

[0002] At present, the market has higher and higher requirements for the endurance performance of new energy vehicles. With the increasing energy consumption demand and the strict restrictions on the volume of battery packs, the maximum single-trip mileage of new energy vehicles mainly depends on the energy density of the battery. High energy density means that more energy can be stored in a smaller volume or lighter weight. When more electricity is stored in the same volume, it shows higher efficiency and practicality in various applications.

[0003] The sealing surface of a traditional battery pack, i.e. the upper cover mounting surface, is generally on the upper end surface. To ensure that the installation is possible, a large assembly surface must be reserved around the perimeter, resulting in a relatively small inner cavity volume and a limited number of cells in the module. In addition, in order to ensure the effective area for the upper cover installation and the sealing gasket extrusion, the left and right side frames are generally wider, resulting in an increase in the weight of the box.

[0004] On the other hand, in order to prevent the liquid cooling plate from deforming greatly after bearing weight, a protective plate is generally required to be added to the bottom of the liquid cooling plate. The general connection method is welding, but it is difficult to load and unload materials during welding, and there is thermal deformation during welding. Summary of the invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a high energy density battery box, aiming to improve the energy density of the battery box.

[0006] Technical solution: To achieve the above-mentioned purpose, a high-energy-density battery box of the present invention comprises a box frame, a liquid cooling plate is installed at the bottom of the box frame, and a plurality of protective plates are installed below the liquid cooling plate; a top cover plate is installed at the top of the box frame, and the space between the top cover plate and the liquid cooling plate is an inner cavity of the box for accommodating the battery cell module; the box frame is composed of a plurality of frames, at least one side frame of the box frame is a side-standing assembly frame, at least one side of the top cover plate is provided with a side cover plate, and the side cover plate corresponds to the side-standing assembly frame; the outer facade of the side-standing assembly frame is an assembly surface matching the side cover plate, and the side cover plate is correspondingly attached to the outer facade.

[0007] Furthermore, the box frame is a square frame, the left and right side frames of the box frame are side assembly frames, and panels are installed on the front and back sides of the box frame; the upper contour surface of the panel is the assembly surface that matches the top cover plate, and the side contour surface of the panel is the assembly surface that matches the side cover plate.

[0008] Furthermore, the outer facade is inclined from top to bottom in a direction away from the inner cavity of the box body, and the side cover is also inclined from top to bottom in a direction away from the inner cavity of the box body.

[0009] Furthermore, an assembly groove is provided on one side of the bottom of the side assembly frame; and clamping structures are provided on both sides of the guard plate, and the guard plate is respectively clamped into the assembly grooves of the two side assembly frames through the clamping structures on both sides, so that the side assembly frame can provide support for the guard plate.

[0010] Furthermore, the two sides of the guard plate are curled into a circle, and the circle is the clip-on structure; the length direction of the assembly groove is consistent with the length direction of the side assembly frame, and the cross-sectional shape of the assembly groove is consistent with the shape of the circle; the two ends of the assembly groove are sockets, and the circle can be slid into the assembly groove from the sockets.

[0011] Furthermore, a certain gap is left between the curled edge of the curled circle and the guard plate body, so that the curled circle can produce a certain degree of deformation; when the curled circle is inserted into the assembly groove, the curled circle is in an extruded state, so that the outer contour of the curled circle fits with the inner wall of the assembly groove.

[0012] Furthermore, a glue storage groove is provided on the outer contour surface of the roll, and glue liquid is stored in the glue storage groove, and the roll is fixed in the assembly groove by gluing.

[0013] Furthermore, a weight-reducing hole is provided in the side stand assembly frame, and the weight-reducing hole extends along the length direction of the side stand assembly frame.

[0014] Furthermore, a plurality of air holes are arranged between the weight-reducing hole and the assembly groove, and the air holes connect the weight-reducing hole and the assembly groove; a plurality of coils are arranged in the assembly groove, and the positions of the air holes correspond to the positions of the coils, and the air holes are connected with the glue storage grooves on the coils; external gas can be blown into the glue storage groove through the weight-reducing holes and the air holes, and the glue liquid in the glue storage groove is blown out onto the inner wall of the assembly groove.

[0015] Furthermore, a plurality of distribution branch grooves are arranged on the outer contour surface of the roll, and the plurality of distribution branch grooves are all connected with the glue storage tank. The air holes can blow the glue liquid in the glue storage tank into each distribution branch groove, so that the glue liquid in each distribution branch groove overflows onto the inner wall of the assembly tank.

[0016] Beneficial effects: The high energy density battery box of the present invention has the following beneficial effects:

[0017] 1) The assembly surface of the battery box side cover is the outer side elevation of the side assembly frame, so that the space in the width direction of the battery box cavity is released, and the number of cells that can be accommodated in the battery box is increased; when the external dimensions of the battery box are the same, the energy density of the battery box can be improved;

[0018] 2) There are curling circles on both sides of the guard plate. When assembling, you only need to snap the curling circles of the guard plate into the assembly groove to ensure the left and right position of the guard plate. After the curling circles on both sides are snapped in, the load-bearing capacity of the guard plate can be guaranteed, so the connection method can be glued instead of welding, and there is no thermal deformation in glueing;

[0019] 3) The rolled circle is in an extruded deformation state in the assembly groove, so that the rolled circle and the assembly groove are tightly attached to each other, and the guard plate is not easy to loosen; a glue storage groove is arranged on the outer contour surface of the rolled circle, and air is blown into the glue storage groove through the weight reduction holes and the air holes, so that the glue in the glue storage groove can be blown out to the inner wall of the assembly groove; thus, when the rolled circle and the assembly groove are tightly attached to each other, the outer contour surface of the rolled circle and the inner wall of the assembly groove can also be connected together by gluing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 The figure is a schematic diagram of the overall structure of the battery box;

[0021] Attached Figure 2 This is a schematic diagram of the components of the battery box;

[0022] Attached Figure 3 It is a schematic diagram of the structure of the guard plate and the panel on the box frame;

[0023] Attached Figure 4 It is a structural schematic diagram of the side assembly frame;

[0024] Attached Figure 5 It is a schematic diagram of the coordination between the side cover plate and the outer facade;

[0025] Attached Figure 6 Schematic diagram of the air hole and glue storage tank. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] As attached Figures 1 to 6 The high energy density battery box includes a box frame 1 of the battery box, a liquid cooling plate 2 is installed at the bottom of the box frame 1, and the liquid cooling plate 2 can liquid-cool the battery cell module 5 in the battery box, and a plurality of protective plates 3 are installed below the liquid cooling plate 2. The liquid cooling plate 2 will deform to a certain extent after bearing the load, and the protective plates 3 can support the liquid cooling plate 2 to prevent the liquid cooling plate 2 from deforming too much. A top cover plate 4 is installed on the top of the box frame 1, and the top cover plate 4 is opposite to the liquid cooling plate 2. Between the top cover plate 4 and the liquid cooling plate 2 is the inner cavity of the box for accommodating the battery cell module 5, that is, the battery cell module 5 is installed in the battery box and is located between the top cover plate 4 and the liquid cooling plate 2.

[0028] The box frame 1 is composed of a plurality of frames welded together, and at least one side frame of the box frame 1 is a side erection assembly frame 6. At least one side of the top cover plate 4 is provided with a side cover plate 7, and the side cover plate 7 corresponds to the side erection assembly frame 6. The outer side elevation 8 of the side erection assembly frame 6 is an assembly surface matched with the side cover plate 7, and the side cover plate 7 is correspondingly attached to the outer side elevation 8.

[0029] A conventional battery box generally has a frame plate mounted on the box frame 1, and the box cover is sealed and assembled with the upper end surface of the frame plate. To ensure installation, a large assembly surface needs to be reserved on the frame plate, resulting in a relatively small volume of the battery box cavity, a limited number of cells in the cell module 5, and a low energy density of the battery box. In addition, in order to ensure the effective area for the box cover installation, the frame plate is generally wide, resulting in an increase in the weight of the battery box, which is not conducive to the lightweighting of the battery box.

[0030] The battery box of the present invention omits the frame plate on the side where the side assembly frame 6 is located, and instead connects the side cover plate 7 to the top cover plate 4, and directly allows the side cover plate 7 to cover the outer side elevation 8 of the side assembly frame 6, and changes the traditional upper end assembly surface to the side assembly surface, so that the space in the width direction of the battery box cavity is released, and the number of cells that can be accommodated in the battery box is increased. When the external dimensions of the battery box are the same, the energy density of the battery box is improved.

[0031] As attached Figure 3 As shown in the figure, the box frame 1 is a square frame, the left and right side frames of the box frame 1 are side mounting frames 6, and the front and rear sides of the box frame 1 are equipped with vertical panels 9. Figure 2 As shown in , the two sides of the top cover plate 4 are integrally connected with the side cover plates 7 , the upper contour surface of the panel 9 is the assembly surface matched with the top cover plate 4 , and the side contour surface of the panel 9 is the assembly surface matched with the side cover plates 7 .

[0032] As attached Figure 5 As shown in the figure, the outer facade 8 is inclined from top to bottom in the direction away from the inner cavity of the box, and correspondingly, the side cover plate 7 is also inclined from top to bottom in the direction away from the inner cavity of the box, so that the left and right sides of the battery box are gradually narrowed from bottom to top, the overall size of the battery box is smaller, and the energy density of the battery box is improved.

[0033] As attached Figure 5 As shown in , a mounting groove 10 is provided on one side of the bottom of the side mounting frame 6. A clamping structure is provided on both sides of the guard plate 3, and the guard plate 3 is respectively clamped into the mounting grooves 10 of the two side mounting frames 6 through the clamping structures on both sides, so that the side mounting frame 6 can provide support for the guard plate 3, and the guard plate 3 provides support for the liquid cooling plate 2 to prevent the liquid cooling plate 2 from deforming too much after bearing the load.

[0034] The two sides of the guard plate 3 are curled into a roll 11, and the roll 11 is the clamping structure. The length direction of the assembly groove 10 is consistent with the length direction of the side assembly frame 6, and the cross-sectional shape of the assembly groove 10 is consistent with the shape of the roll 11. The outer contour of the roll 11 is circular, and the cross-sectional shape of the assembly groove 10 is also circular. The two ends of the assembly groove 10 are sockets, and the roll 11 can be slid into the assembly groove 10 from the sockets. One side of the assembly groove 10 is open, and the roll 11 is connected to the guard plate 3 body through the opening on one side of the assembly groove 10.

[0035] A certain gap is left between the curling edge of the curled circle 11 and the body of the guard plate 3, so that the curled circle 11 can produce a certain degree of deformation, that is, the degree of curling of the curled circle 11 can change to a certain extent. When the curled circle 11 is inserted into the assembly groove 10, the curled circle 11 is in an extruded state, so that the outer contour of the curled circle 11 fits the inner wall of the assembly groove 10, and the curled circle 11 can be clamped in the assembly groove 10, so that the guard plate 3 is stably connected to the side assembly frame 6, the guard plate 3 is not easy to loosen, and the guard plate 3 has a good supporting effect on the liquid cooling plate 2.

[0036] Generally speaking, the connection method between the guard plate 3 and the box frame 1 is welding, but it is difficult to load and unload materials during welding, and there is thermal deformation during welding. In the present invention, since the curls 11 are set on both sides of the guard plate 3, it is only necessary to snap the curls 11 of the guard plate 3 into the assembly groove 10 during assembly to ensure the left and right position of the guard plate 3, and then adjust the front and back position of the guard plate 3. After the curls 11 on both sides are snapped in, the load-bearing capacity of the guard plate 3 can be guaranteed, so the connection method can be glued instead of welding, and there is no thermal deformation in gluing. Therefore, in the present invention, the curl 11 is fixed in the assembly groove 10 by gluing. However, since the curl 11 is in an extruded state in the assembly groove 10, the outer contour of the curl 11 fits the inner wall of the assembly groove 10, so it is difficult to add glue between the curl 11 and the assembly groove 10. Therefore, a glue storage groove 12 is provided on the outer contour surface of the coil 11, and glue liquid is stored in the glue storage groove 12. Before the coil 11 is inserted into the assembly groove 10, a certain amount of glue liquid is added to the glue storage groove 12 in advance. In this way, after the coil 11 is inserted into the assembly groove 10, the glue liquid in the glue storage groove 12 can be used to glue and fix the coil 11 at a suitable position in the assembly groove 10.

[0037] As attached Figure 5 and 6 As shown in the figure, a weight-reducing hole 13 is provided in the side assembly frame 6, and the weight-reducing hole 13 extends along the length direction of the side assembly frame 6. The setting of the weight-reducing hole 13 can reduce the weight of the side assembly frame 6, which is conducive to the lightweight of the battery box.

[0038] As attached Figure 6 As shown in the figure, the weight-reducing hole 13 and the assembly groove 10 are parallel to each other, and a plurality of air holes 14 are arranged between the weight-reducing hole 13 and the assembly groove 10. The plurality of air holes 14 are arranged along the length direction of the side assembly frame 6. The upper end of the air hole 14 is connected to the weight-reducing hole 13, and the lower end of the air hole 14 is connected to the assembly groove 10. Figure 3As shown in the figure, a plurality of guard plates 3 are arranged on the box frame 1, and correspondingly, a plurality of rolls 11 are arranged in the assembly groove 10. The position of the air hole 14 corresponds to the position of the roll 11, and when the roll 11 moves to the position of the air hole 14 with the guard plate 3, the air hole 14 is connected with the glue storage tank 12 on the roll 11. As a result, the external gas can be blown into the glue storage tank 12 through the weight loss hole 13 and the air hole 14, so that the glue in the glue storage tank 12 is blown out to the inner wall of the assembly groove 10. If the glue storage tank 12 is not blown, the bonding area between the glue in the glue storage tank 12 and the assembly groove 10 is small, and the bonding effect between the roll 11 and the assembly is not good. In actual application, one end of the weight loss hole 13 can be blocked, and then the air supply device can be used to blow air to the other end of the weight loss hole 13, and the air flow blows to the glue storage tank 12 through the air hole 14, so that the glue in the glue storage tank 12 overflows to the inner wall of the assembly groove 10.

[0039] A plurality of distribution branch grooves are also provided on the outer contour surface of the curl 11, and the plurality of distribution branch grooves are all connected to the glue storage groove 12. The air holes 14 can blow the glue in the glue storage groove 12 to each distribution branch groove, so that the glue in each distribution branch groove overflows onto the inner wall of the assembly groove 10. By providing the distribution branch grooves, the bonding area between the curl 11 and the assembly groove 10 is made larger, and the curl 11 can be more firmly bonded to the assembly groove 10.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A battery box with high energy density, characterized in that: The invention comprises a box frame (1), a liquid cooling plate (2) is installed at the bottom of the box frame (1), and a plurality of protective plates (3) are installed below the liquid cooling plate (2); a top cover plate (4) is installed at the top of the box frame (1), and a box inner cavity for accommodating a battery cell module (5) is located between the top cover plate (4) and the liquid cooling plate (2); the box frame (1) is composed of a plurality of frames, at least one side frame of the box frame (1) is a side vertical assembly frame (6), at least one side of the top cover plate (4) is provided with a side cover plate (7), and the side cover plate (7) corresponds to the side vertical assembly frame (6); an outer vertical surface (8) of the side vertical assembly frame (6) is an assembly surface matched with the side cover plate (7), and the side cover plate (7) is correspondingly attached to the outer vertical surface (8).

2. A high energy density battery box according to claim 1, characterized in that: The box frame (1) is a square frame, the left and right side frames of the box frame (1) are side vertical assembly frames (6), and panels (9) are installed on the front and rear sides of the box frame (1); the upper contour surface of the panel (9) is an assembly surface that matches the top cover plate (4), and the side contour surface of the panel (9) is an assembly surface that matches the side cover plate (7).

3. A high energy density battery box according to claim 2, characterized in that: The outer facade (8) is inclined from top to bottom in a direction away from the inner cavity of the box body, and the side cover plate (7) is also inclined from top to bottom in a direction away from the inner cavity of the box body.

4. A high energy density battery box according to claim 2, characterized in that: A mounting groove (10) is provided on one side of the bottom of the side mounting frame (6); and clamping structures are provided on both sides of the guard plate (3). The guard plate (3) is respectively clamped into the mounting grooves (10) of the two side mounting frames (6) through the clamping structures on both sides, so that the side mounting frames (6) can provide support for the guard plate (3).

5. A high energy density battery box according to claim 4, characterized in that: The two sides of the guard plate (3) are curled into a curl (11), and the curl (11) is the clamping structure; the length direction of the assembly groove (10) is consistent with the length direction of the side assembly frame (6), and the cross-sectional shape of the assembly groove (10) is consistent with the shape of the curl (11); the two ends of the assembly groove (10) are sockets, and the curl (11) can be slidably inserted into the assembly groove (10) from the sockets.

6. A high energy density battery box according to claim 5, characterized in that: A certain gap is left between the curled edge of the curled circle (11) and the body of the guard plate (3), so that the curled circle (11) can produce a certain degree of deformation; when the curled circle (11) is inserted into the assembly groove (10), the curled circle (11) is in an extruded state, so that the outer contour of the curled circle (11) fits the inner wall of the assembly groove (10).

7. A high energy density battery box according to claim 6, characterized in that: A glue storage groove (12) is provided on the outer contour surface of the curled circle (11), and glue liquid is stored in the glue storage groove (12). The curled circle (11) is fixed in the assembly groove (10) by gluing.

8. A high energy density battery box according to claim 7, characterized in that: A weight-reducing hole (13) is provided in the side erecting assembly frame (6), and the weight-reducing hole (13) extends along the length direction of the side erecting assembly frame (6).

9. A high energy density battery box according to claim 8, characterized in that: A plurality of air holes (14) are arranged between the weight-reducing hole (13) and the assembly groove (10), and the air holes (14) are in communication with the weight-reducing hole (13) and the assembly groove (10); a plurality of curls (11) are arranged in the assembly groove (10), and the positions of the air holes (14) correspond to the positions of the curls (11), and the air holes (14) and the glue storage groove (12) on the curls (11) are in communication with each other; external gas can be blown into the glue storage groove (12) through the weight-reducing hole (13) and the air holes (14), and the glue liquid in the glue storage groove (12) is blown out onto the inner wall of the assembly groove (10).

10. A high energy density battery box according to claim 9, characterized in that: The outer contour surface of the curl (11) is also provided with a plurality of distribution branch grooves, and the plurality of distribution branch grooves are all connected to the glue storage groove (12). The air holes (14) can blow the glue liquid in the glue storage groove (12) into each distribution branch groove, so that the glue liquid in each distribution branch groove overflows onto the inner wall of the assembly groove (10).

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