Battery box body and boxing method

Abstract

The invention provides a battery box body and a boxing method. The battery box body comprises a battery side frame and a supporting beam, the supporting beam is positioned in the battery side frame and divides a space for accommodating a battery cell into at least two subspaces; the supporting beam comprises at least two sections of sub-beams which are arranged in a single row, and the two sections of sub-beams positioned at the two end parts of the supporting beam are fixedly connected with the battery side frames respectively; a positioning concave end and a positioning convex end are arranged at the two opposite ends of any two adjacent sections of sub-beams in a one-to-one correspondence manner, and a gap for absorbing the stacking tolerance of battery cells is formed between the positioning concave end and the positioning convex end in the width direction of the supporting beam. According to the technical scheme, the supporting beam is formed by mutually fixing and combining the at least two sections of sub-beams, so that when the battery cells are assembled into a box, the stacking tolerance of the battery cells can be absorbed through the gaps between the positioning concave ends and the positioning convex ends, and the problem that the battery cells are difficult to enter the box or even cannot enter the box due to the stacking tolerance of the battery cells is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and a method for inserting a battery into a box. Background Art

[0002] The battery is the core component of electric vehicles. A typical battery consists of a box and cells arranged inside the box. During the battery assembly process, the cells need to be placed in the box in a certain pattern. For safety reasons, multiple beams are arranged in the battery pack to enhance the strength of the battery pack. These beams divide the space inside the box into multiple subspaces. The cells are stacked and placed in these subspaces.

[0003] Since each battery cell has a certain dimensional tolerance, when placing the battery cells into the sub-space, the dimensional tolerances of multiple battery cells may be stacked, which may cause the overall size of a group of battery cells to be out of tolerance, easily making it difficult or even impossible for the battery cells to be placed in the box. Summary of the invention

[0004] The present application provides a battery case and a method for inserting the battery case to improve the problem that the battery cells are difficult or even cannot be inserted into the case due to the stacking of battery cell tolerances.

[0005] In a first aspect, the present application provides a battery box, which includes: a battery side frame and a support beam; wherein:

[0006] The support beam is located in the battery side frame and divides the space for accommodating the battery cell into at least two sub-spaces in the battery side frame;

[0007] The support beam comprises at least two sections of sub-beams arranged in a single row, and the two sections of sub-beams located at the two ends of the support beam are respectively fixedly connected to the battery side frames; the opposite ends of any two adjacent sections of sub-beams are provided with positioning concave ends and positioning convex ends in a one-to-one correspondence, and the concave direction of the positioning concave ends and the convex direction of the positioning convex ends are both along the length direction of the support beam;

[0008] Along the width direction of the support beam, there is a gap between the positioning concave end and the positioning convex end for absorbing the stacking tolerance of the battery cells.

[0009] In the above technical solution, by setting a support beam composed of at least two sections of sub-beams fixedly combined with each other, when the battery cells are assembled into the box, the stacking tolerance of the battery cells can be absorbed by the gap between the positioning concave end and the positioning convex end, thereby improving the problem of difficulty or even inability to put the battery cells into the box due to the stacking of battery cell tolerances.

[0010] In a possible implementation, the positioning protrusion includes a boss protruding relative to the end of the sub-beam where the positioning protrusion is located along the length direction of the support beam; along the width direction of the support beam, there is a gap between the boss and both ends of the sub-beam where the positioning protrusion is located;

[0011] The positioning concave end includes a groove that is recessed relative to the end of the sub-beam where the positioning concave end is located along the length direction, and along the width direction of the support beam, there is a gap between the groove and both ends of the sub-beam where the positioning concave end is located.

[0012] In a possible implementation, along the length direction of the support beam, the protrusion length of the boss relative to the sub-beam is L1; along the width direction of the support beam, the width of the sub-beam is L2;

[0013] 8≥L2 / L1≥4.

[0014] In a possible implementation manner, an end portion of the sub-beam for fixedly connecting to the battery side frame for fixedly connecting to the battery side frame is provided with an oblong hole; the waist length of the oblong hole is along the width direction of the support beam;

[0015] The oblong hole is used for passing a threaded fastener, and the sub-beam is fixedly connected to the battery side frame through the threaded fastener.

[0016] In a possible implementation, the length direction of the support beam is parallel to the width direction of the vehicle body, the central axis of the vehicle body in the width direction is used as the axis of symmetry, and the positioning protruding end and the positioning concave end are axially symmetrically distributed on the support beam.

[0017] In a possible implementation, the support beam includes three sections of sub-beams, and each section of the sub-beam corresponds to the same number of battery cells along the length direction of the support beam.

[0018] In a second aspect, the present application provides a boxing method, which is applied to a battery box, wherein the battery box is any of the battery boxes described above; the method comprises:

[0019] Pre-installing each section of the sub-beam and the battery cells located on both sides of the sub-beam along the length direction of the support beam into a sub-module;

[0020] All submodules are placed in the battery side frame, and the positioning convex end of each subbeam is embedded into the positioning concave end of the adjacent subbeam; and the assembly tolerance is absorbed by the gap between the positioning concave end and the positioning convex end;

[0021] The positioning convex end and the positioning concave end are fixedly connected to form a support beam.

[0022] In the above technical solution, the support beam is formed by at least two sections of sub-beams fixedly assembled together, so that when the battery cells are assembled into the box, the stacking tolerance of the battery cells can be absorbed by the gap between the positioning concave end and the positioning convex end, thereby improving the problem of difficulty or even inability to put the battery cells into the box due to the stacking of battery cell tolerances.

[0023] In a possible implementation manner, the positioning protruding end and the positioning concave end are fixedly connected to form a support beam, specifically:

[0024] The positioning convex end and the positioning concave end are welded and fixed.

[0025] In a possible implementation manner, when the sub-beam for being fixedly connected to the battery side frame is fixedly connected to the battery side frame via a threaded fastener, the method further includes:

[0026] The sub-beam used for being fixedly connected to the battery side frame is fixedly connected to the battery side frame by means of threaded fasteners;

[0027] The sub-beam used for fixed connection with the battery side frame is welded and fixed to the battery side frame.

[0028] In a possible implementation manner, all submodules are placed in the battery side frame, and the positioning convex end of each subbeam is embedded in the positioning concave end of the adjacent subbeam, specifically:

[0029] Place two submodules close to the battery side frames on both sides along the length direction of the support beam into the accommodation space, and fix the two sections of the sub-beams of the two submodules to the battery side frames respectively;

[0030] Starting from the submodules located at the two ends of the support beam in the length direction, other submodules are placed in sequence toward the middle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an overall schematic diagram of the battery box in the embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the explosion of the support beam in the embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the cooperation between the positioning convex end and the positioning concave end in the embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the connection between the support beam and the battery side frame in the embodiment of the present application;

[0035] Figure 5 This is an overall schematic diagram of the battery side frame in the embodiment of the present application;

[0036] Figure 6This is a schematic diagram of the box entry method in the embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] To facilitate understanding of the battery box and the box insertion method provided in the embodiment of the present application, the application scenario thereof is first described. The battery box provided in the embodiment of the present application can be applied to transportation vehicles, in particular, electric vehicles.

[0040] The battery is the core component of electric vehicles. The general battery consists of a box and cells arranged in the box. During the battery assembly process, the cells need to be placed in the box in a certain pattern. For example, in some battery packs, the cells are arranged horizontally and vertically to form a cell group. The cell group is then clamped and placed in the box by a special tool room.

[0041] When using the battery, it is necessary to consider extreme working conditions such as side column collision and impact. For safety performance considerations, multiple beams are arranged in the battery pack to enhance the strength of the battery pack. These beams divide the space in the box into multiple subspaces. The battery cells are stacked to form a battery group and then placed in these subspaces. Since each battery cell has a certain dimensional tolerance, when placing the battery cell in a subspace, the dimensional tolerances of multiple battery cells may cause the overall size of a group of battery cells to be out of tolerance after stacking, which may easily lead to problems such as difficulty or even inability to put the battery cells into the box.

[0042] Based on this, the present application provides a battery box to improve the problem that the battery cells are difficult or even cannot be put into the box due to the stacking of battery cell tolerances. The battery box provided by the present application is specifically introduced below in conjunction with the accompanying drawings.

[0043] For reference Figure 1 as well as Figure 2 , Figure 1 This is an overall schematic diagram of the battery box in the embodiment of the present application. Figure 2 The figure is a schematic diagram of the explosion of the support beam in the embodiment of the present application. The battery box provided in the embodiment of the present application includes a battery side frame 1 and a support beam 2. The battery side frame 1 is used to cooperate with the top cover and bottom plate of the battery to form a space for accommodating the battery cell. The support beam 2 is arranged in the battery side frame 1, and the support beam 2 is used to enhance the lateral impact resistance of the battery side frame 1. As an example, Figure 1 The middle arrow shows the lateral force direction of the battery side frame 1. The support beam 2 is extended along the lateral impact force direction of the battery side frame 1 and spans the entire inside of the battery side frame 1. In addition, the support beam 2 is respectively connected to the two opposite battery side frames 1. The support beam 2 arranged in this way divides the space in the battery side frame 1 for accommodating the battery cell into at least two subspaces. As an example, Figure 1 The number of support beams 2 shown is one, that is, the space for accommodating the battery cells is divided into two sub-spaces; if the number of support beams 2 is two and the two support beams 2 are arranged at intervals, the space for accommodating the battery cells by the two support beams 2 is divided into three sub-spaces; if the number of support beams 2 is more, more sub-spaces may be separated, which will not be repeated here.

[0044] When the support beam 2 is specifically set, the support beam 2 is composed of at least two sections of sub-beams 21. Specifically, when the support beam 2 is placed inside the battery side frame 1, at least two sections of sub-beams 21 are arranged in a single row along the length direction of the support beam 2, and all the sub-beams 21 are connected end to end to form a support beam 2 that spans the internal space of the battery side frame 1. When the two support beams 2 are specifically fixed to the battery side frame 1, the two sections of sub-beams 21 located at the two ends of the support beam 2 are respectively fixedly connected to the battery side frame 1. By setting such a support beam 2 in the battery side frame 1, when the battery pack as a whole is subjected to a lateral impact, the support beam 2 can provide support for the battery side frame 1 inside the battery side frame 1, thereby resisting the lateral impact and reducing the risk of damage to the battery pack as a whole.

[0045] For any two adjacent sections of sub-beams 21, the two opposite ends of the two sections of sub-beams 21 are provided with positioning concave ends 22 and positioning convex ends 23 in a one-to-one correspondence. The opposite ends of the two adjacent sections of sub-beams 21 here are the two ends of the two adjacent sections of sub-beams 21 for connecting with each other. Among the two opposite ends, one end is provided with a positioning convex end 23, and the other end is provided with a positioning concave end 22. Specifically, the positioning concave end 22 is recessed relative to the end of the sub-beam 21 along the length direction of the support beam 2, and the positioning convex end 23 is also protruding relative to the end of the sub-beam 21 along the length direction of the support beam 2. When the sub-beam 21 is connected to the support beam 2, the positioning convex end 23 and the positioning concave end 22 are nested and matched with each other, so that the positioning match between the two adjacent sections of sub-beams 21 can be achieved.

[0046] For reference Figure 3 , Figure 3 This is a schematic diagram of the cooperation between the positioning convex end and the positioning concave end in the embodiment of the present application. When the positioning convex end 23 and the positioning concave end 22 are specifically set, there is a gap 3 between the positioning convex end 23 and the positioning concave end 22 in the width direction of the support beam 2 for absorbing the stacking tolerance of the battery cells. That is, in the width direction of the support beam 2, there can be a certain floating gap 3 between two adjacent sections of the sub-beams 21, and the gap 3 can be used to absorb the stacking tolerance of the battery cells.

[0047] Here, the gap 3 between the positioning convex end 23 and the positioning concave end 22 is only used to absorb the stacking tolerance of the battery cells during the battery cell boxing. After all the battery cells are boxed, the positioning convex end 23 and the positioning concave end 22 that cooperate with each other can also be fixedly connected, for example, the two are welded or bonded, so that each section beam 21 of the support beam 2 is fixed as a whole, which can improve the structural strength of the support beam 2, thereby improving the overall structural strength of the battery pack. It should be understood that after the positioning convex end 23 and the positioning concave end 22 are fixedly connected, the gap 3 between the positioning convex end 23 and the positioning concave end will also be filled with solder, adhesive, etc., or the gap 3 may be filled with materials melted during the welding process.

[0048] For the traditional integrated crossbeam 4, once the position of the integrated crossbeam 4 is determined, the two subspaces separated by the integrated crossbeam 4 are two determined subspaces, and the dimensions of the two subspaces along the width direction of the support beam 2 are determined. The battery box provided in the embodiment of the present application adopts a support beam 2. When the support beam 2 is arranged inside the battery side frame 1, the dimensions of the two subspaces separated by the support beam 2 along the width direction of the support beam 2 can have a certain floating range, wherein the floating range of the subspace corresponding to each section of the subbeam 21 is the floating gap 3 between the subbeam 21 and the adjacent subbeam 21. Since the dimensions of the subspace in the width direction of the support beam 2 have a floating range, such a subspace can allow the battery cell group in a single subspace to have a larger stacking tolerance. Therefore, compared with the traditional integrated crossbeam 4, the technical solution of the support beam 2 adopted in the embodiment of the present application can improve the problem that the battery cell is difficult or even impossible to enter the box due to the stacking of the battery cell tolerance.

[0049] In addition, Figure 1 Take the battery box shown in the figure as an example. Figure 1In the battery box shown, along the width direction of the support beam 2, 8 rows of cells are arranged in each of the two subspaces separated by the support beam 2. Because each subbeam 21 can have a movable gap 3 relative to the adjacent subbeam 21, for the accommodation space corresponding to each section of the subbeam 21, in the width direction of the support beam 2, as long as the overall size of the 16 rows of cells on both sides of each section of the subbeam 21 and the corresponding section of the subbeam 21 after stacking does not exceed the size of the accommodation space, the combination of these cells and the subbeam 21 can be placed in the battery side frame 1. As for the integrated crossbeam 4, since the size of the subspace separated by the integrated crossbeam 4 is determined, in the width direction of the support beam 2, if the size of the 8 rows of cells in each subspace after stacking exceeds the size of the subspace, the combination of cells cannot be placed in the subspace. It is not difficult to know from the law of large numbers in statistics that in the width direction of the support beam 2, the more rows of cells there are, the smaller the effect of the size deviation of a single cell on the size deviation of the stacked cells. Therefore, the technical solution of using the support beam 2 can improve the problem in the prior art that the battery cells are difficult or even impossible to put into the box due to the stacking of battery cell tolerances.

[0050] As an optional implementation, when the battery box in the embodiment of the present application is specifically arranged on the vehicle body, the length direction of the support beam 2 is parallel to the width direction of the vehicle body, and the central axis in the width direction of the vehicle body is used as the axis of symmetry, and the positioning protrusion 23 and the positioning concave end 22 are axially symmetrically distributed on the support beam 2. For example Figure 2 The support beam 2 shown in the figure includes three sections of sub-beams 21, wherein the opposite ends of the sub-beam 21 located in the middle section are both positioning convex ends 23, and the ends of the sub-beams 21 located on both sides connected to the middle section sub-beam 21 are both positioning concave ends 22, and the joints between the middle section sub-beam 21 and the sub-beams 21 on both sides are axially symmetrical relative to the central axis. Of course, in other possible implementations, the number of sub-beams 21 can also be 5 sections, 7 sections, etc., which can be determined specifically according to the number of battery cell arrangements and tolerance stacking conditions, and can also be set in a manner such that the middle section is provided with a positioning concave end 22, and the two side sections are provided with a positioning convex end 23, etc. Optionally, the number of sub-beams 21 can be set to an odd number of sections greater than 1, so as to utilize the axial symmetry of the support beam 2.

[0051] When the battery box is installed on the vehicle body, the battery box is generally arranged in the center of the vehicle body for dynamic balance considerations. By arranging the positioning protruding end 23 and the positioning concave end 22 symmetrically along the central axis, the weight balance of the battery box on both sides of the central axis can be further improved, thereby improving the dynamic balance performance of the vehicle.

[0052] As an optional implementation, the support beam 2 in the embodiment of the present application includes three sections of sub-beams 21, and each section of sub-beams 21 corresponds to the same number of battery cells along the length direction of the support beam 2. As an example, Figure 1In the battery box shown, each section of the sub-beam 21 corresponds to two columns of battery cells in the length direction of the support beam 2, and three sections of the sub-beam 21 correspond to a total of six columns of battery cells. This arrangement can minimize the number of sub-beams 21 while ensuring that the support beam 2 can better absorb the battery cell stacking tolerance, thereby improving the structural stability of the support beam 2 and the assembly efficiency of the battery box.

[0053] As an optional implementation, continue to refer to Figure 2 and Figure 3 When the positioning protrusion 23 and the positioning concave end 22 are specifically arranged, the positioning protrusion 23 in the embodiment of the present application includes a boss 231 protruding relative to the end of the sub-beam 21 where the positioning protrusion 23 is located along the length direction of the support beam 2, that is, the boss 231 is located on a sub-beam 21 and protrudes toward the direction where the sub-beam 21 adjacent to the sub-beam 21 is located. And along the width direction of the support beam 2, the boss 231 and the opposite ends of the sub-beam 21 are spaced. That is, in the width direction of the support beam 2, both sides of the boss 231 have a drop with the end of the sub-beam 21 and form two shoulders.

[0054] Corresponding to the boss 231, the positioning concave end 22 includes a groove 221 that is recessed relative to the end 21 of the sub-beam where the positioning concave end 22 is located along the length direction of the support beam 2, that is, the groove 221 is set at one end of a sub-beam 21 and protrudes toward the direction where the other end of the sub-beam 21 is located. And along the width direction of the support beam 2, there is a gap between the groove 221 and both ends of the sub-beam 21. That is, Figure 2 or Figure 3 As shown, in the width direction of the support beam 2 , the groove 221 for positioning the concave end 22 is also located in the middle of the sub-beam 21 , and groove walls are provided on both sides of the groove 221 .

[0055] When the positioning protrusion 23 and the positioning concave end 22 are positioned and matched, the fixed boss 231 is inserted into the groove 221. The positioning protrusion 23 and the positioning concave end 22 are arranged in this way. After the positioning protrusion 23 and the positioning concave end 22 are plugged into and matched with each other, if the two adjacent sections of the sub-beams 21 are subjected to force along the width direction of the support beam 2, the boss 231 and the side walls of the groove 221 can abut against each other to reduce the risk of the two sections of the sub-beams 21 breaking at the connection, thereby further improving the structural strength of the support beam 2.

[0056] Optionally, when the boss 231 is specifically set, the size of the boss 231 can be limited to a certain range to further ensure the structural strength of the support beam 2. For the convenience of description, as Figure 3As shown, some size parameters of the positioning protrusion 23 are named. Specifically, along the length direction of the support beam 2, the protrusion length of the boss 231 relative to the sub-beam 21 is L1; at the same time, along the width direction of the support beam 2, the width of the sub-beam 21 is L2. L1 and L2 satisfy: 8≥L2 / L1≥4.

[0057] When the boss 231 is specifically set, the boss 231 of the positioning boss 23 can be regarded as a cantilever structure compared to the main body of the sub-beam 21. If the ratio between the width of the sub-beam 21 and the protruding size of the boss 231 is too small, it means that the arm length of the cantilever structure is too long, which will reduce the structural strength of the positioning boss 23; on the contrary, if the ratio between the width of the sub-beam 21 and the protruding size of the boss 231 is too large, it means that the arm length of the cantilever structure is too short, and when the support beam 2 is subjected to force in the width direction, the boss 231 is easy to flip out of the groove 221. In this optional embodiment, L2 and L1 are set to meet the above quantitative relationship, which can take into account the structural strength of the positioning boss 23 and the connection stability of the boss 231 and the groove 221, thereby improving the structural stability of the support beam 2.

[0058] Optionally, when specifically setting the boss 231 and the groove 221, the boss 231 and the groove 221 may be arranged centrally on the sub-beam 21 along the width direction of the support beam 2, so that the structures on both sides of the boss 231 or the groove 221 are more balanced.

[0059] Of course, it is worth noting that when the positioning convex end 23 and the positioning concave end 22 are specifically set, the positioning convex end 23 and the positioning concave end 22 are not limited to the above-mentioned embodiment. In other possible embodiments, along the width direction of the support beam 2, the boss 231 may also be set at one end of the sub-beam 21, and the corresponding groove 221 may be set at the other opposite end. And, in other possible embodiments, the positioning convex end 23 and the positioning concave end 22 may also be serrated or other similar shapes.

[0060] refer to Figure 4 , Figure 4 It is a schematic diagram of the connection between the support beam and the battery side frame in the embodiment of the present application. As an optional embodiment, when the sub-beam 21 is specifically set to be fixedly connected to the battery side frame 1, the end of the sub-beam 21 for fixed connection with the battery side frame 1 is provided with an oblong hole 2121, and the waist length of the oblong hole 2121 extends along the width direction of the support beam 2. The oblong hole 2121 is used to penetrate the threaded fasteners, and the sub-beam 21 can be fixedly connected to the battery side frame 1 by using the threaded fasteners. By providing the oblong hole 2121, the waist length of the oblong hole 2121 can be used to absorb the accumulated tolerances during the stacking of the battery cells, thereby further improving the problem of difficulty or even inability to put the battery cells into the box due to the stacking of the battery cell tolerances.

[0061] Optionally, when a sub-beam 21 is specifically provided for being fixedly connected to the battery side frame 1, the sub-beam 21 may include a body 211 and a connector 212, wherein the body 211 is used to set a positioning convex end 23 or a positioning concave end 22, and the connector 212 is provided between the body 211 and the battery side frame 1, and is used to connect the body 211 to the battery side frame 1. An oblong hole 2121 for threading a threaded fastener is provided on the connector 212, and the connector 212 may be fixedly connected to the body 211 by welding, bonding, or the like. In such a setting, the connector 212 and the body 211 may be produced separately, which is beneficial to the mass production of the body 211 and can improve the production efficiency of the support beam 2.

[0062] refer to Figure 5 , Figure 5 This is an overall schematic diagram of the battery side frame in an embodiment of the present application. Figure 5 The example shows a complete battery side frame 1, in which an integral accommodating space is enclosed, and an integrated crossbeam 4 and a support beam 2 are arranged in parallel in the accommodating space. Among them, the side of the integrated crossbeam 4 away from the support beam 2 is a relatively large sub-space, which can accommodate more rows of battery cells. Therefore, the size deviation of the battery cell group placed in this sub-space is less affected by the size deviation of a single battery cell, and the installation of the integrated crossbeam 4 can meet the assembly requirements. On the side of the integrated crossbeam 4 facing the support beam 2, the support beam 2 divides the area between the integrated crossbeam 4 and the battery side frame 1 into two smaller sub-spaces. These two sub-spaces can accommodate fewer rows of battery cells. Therefore, the support beam 2 is provided to better absorb the overall size deviation generated after the battery cells are stacked.

[0063] For reference Figure 6 , Figure 6 The present invention also provides a method for boxing, which can be applied to any of the battery boxes mentioned above. The method for boxing includes the following steps:

[0064] S101: pre-assemble each section of the sub-beam 21 and the battery cells located on both sides of the sub-beam 21 along the length direction of the support beam 2 into a sub-module. In the above steps, in the process of pre-assembling into a sub-module, the battery cells and the sub-beams 21 in the sub-module can be stacked, and the sub-module can be clamped and fixed as a whole by a special clamp. As an example, Figure 1 In the example, a section of sub-beam 21 and two columns of 16 rows of cells located on both sides of the sub-beam 21 along the width direction of the support beam 2 are pre-installed as a sub-module.

[0065] When clamping and fixing with a special clamp, the special clamp can be used to hold the two ends of the submodule along the width direction of the support beam 2, and the special clamp applies a certain clamping force to the middle in this direction to compress the submodule as a whole. After the compressed submodule is placed inside the battery side frame 1, it will automatically rebound after the special clamp is removed, thereby completing the placement of the submodule.

[0066] It should be understood that the above-mentioned special clamp can be a robot arm and other forms of special clamps commonly used in the art, so the specific form of the special clamp is not described here.

[0067] S102: All submodules are placed in the battery side frame 1, and the positioning protrusion 23 of each sub-beam 21 is embedded in the positioning concave end 22 of the adjacent sub-beam 21; and the assembly tolerance is absorbed by the gap 3 between the positioning concave end 22 and the positioning protrusion 23.

[0068] In this step, when placing the submodule into the battery side frame 1, the submodule clamped by the special clamp is placed into the battery side frame 1, and then the special clamp is removed. At this time, the submodule will rebound until the two ends of the submodule along the width direction of the support beam 2 are respectively abutted against the battery side frame 1 or other beams in the battery side frame 1, that is, the placement of a submodule is completed. As an example, if Figure 1 In the battery box shown in , when a submodule is placed, one opposite end of the submodule abuts against the battery side frame 1, and the other opposite end of the submodule abuts against the integrated crossbeam 4 in the battery side frame 1. Of course, in other possible implementations, if no other crossbeam is provided in the battery side frame 1, both opposite ends of the submodule may abut against the battery side frame 1.

[0069] When placing the sub-modules, it is also necessary to ensure that the positioning convex end 23 of each sub-beam 21 is embedded in the positioning concave end 22 of the adjacent sub-beam 21. As an example, Figure 1 The battery case shown, after placing a submodule and then placing other submodules adjacent to the submodule, can align the positioning protrusion 23 with the positioning concave end 22 outside the battery side frame 1, and then vertically drop the submodule into the battery side frame 1, so that the mutual insertion of the positioning protrusion 23 and the positioning concave end 22 can be achieved. When placing the submodule, the gap 3 between the positioning protrusion 23 and the positioning concave end 22 can be used to absorb the dimensional deviation of the overall submodule after the battery cells are stacked. Among them, the specific principle of using the gap 3 to absorb the dimensional deviation can be referred to the above description, and will not be repeated here. By setting a certain gap 3 between the positioning protrusion 23 and the positioning concave end 22, and using the gap 3 to absorb the overall dimensional deviation after the battery cells are stacked, the problem of difficulty or even inability to put the battery cells into the box due to the stacking of battery cell tolerances can be improved.

[0070] When placing the submodules, a certain order can be followed. As an optional implementation, when placing the submodules into the battery test frame, the two submodules close to the battery side frames 1 on both sides along the length direction of the support beam 2 can be first placed into the accommodation space, and the two sections of the sub-beams 21 of the two submodules are respectively fixed to the battery side frames 1; then, starting from the submodules located at the two ends of the length direction of the support beam 2, other submodules are placed in sequence toward the middle.

[0071] As an example, Figure 1 In the battery box shown, when placing the submodules into the battery side frame 1, the submodules at the two ends are first placed into the battery side frame 1, and then the two sections of sub-beams 21 are respectively fixedly connected to the battery side frame 1; then the middle submodule is placed into the battery side frame, and the two positioning protruding ends 23 of the sub-beam 21 of the middle submodule are respectively plugged into the positioning concave ends 22 of the sub-beams 21 on both sides. Of course, in other optional embodiments, if the support beam 2 includes 5 sections of sub-beams 21, the submodules at the opposite ends of the length direction of the support beam 2 are placed first, and then the two submodules adjacent to the submodules at the two ends are placed, and finally the middle submodule is placed.

[0072] In the process of sequentially placing the submodules, the position deviation of the submodules will gradually accumulate as the submodules are placed sequentially. By gradually placing the submodules from both ends to the middle, the accumulation of position deviation of the submodules can be reduced, thereby making it easier for the submodules to be smoothly placed in the battery side frame 1.

[0073] S103: The positioning protrusion 23 and the positioning concave end 22 are fixedly connected to form a support beam 2. The specific fixed connection method may include but is not limited to bonding, welding and the like. It should be understood that after the positioning protrusion 23 and the positioning concave end 22 are fixedly connected, the gap 3 between the positioning protrusion 23 and the positioning concave end 22 for absorbing the stacking tolerance of the battery cells will also be unable to float, and the gap 3 may be filled with solder, adhesive materials, etc., or may be filled with materials melted during the welding process. By fixedly connecting the positioning protrusion 23 and the positioning concave end 22, the structural stability of the support beam 2 may be further improved.

[0074] It should be understood that in the specific process of fixing the positioning protrusion 23 and the positioning concave end 22, the sub-modules at both ends of the support beam 2 in the length direction can be placed into the battery side frame 1, and then each sub-module is placed, and the positioning protrusion 23 and the positioning concave end 22 are fixedly connected once; of course, it is also possible to wait until all sub-modules are placed into the battery side frame 1, and then uniformly fix all adjacent positioning protrusions 23 and positioning concave ends 22.

[0075] Optionally, welding can be used to fix the positioning protruding end 23 and the positioning concave end 22. Welding has the advantages of easy operation and stable connection.

[0076] As an optional embodiment, when the sub-beam 21 used for fixed connection to the battery side frame 1 is fixedly connected to the battery side frame 1 through threaded fasteners, the box entry method provided in the present application also includes: fixing the support beam 2 to the battery side frame 1 through threaded fasteners; welding and fixing the sub-beam 21 used for fixed connection to the battery side frame 1 to the battery side frame 1.

[0077] The sub-beam 21 for being fixedly connected to the battery side beam is fixedly connected to the battery side frame 1 by means of threaded fasteners, that is, the support beam 2 is fixedly connected to the battery side frame 1 by means of threaded fasteners. As a specific example, the threaded fasteners can be used to pass through the oblong holes 2121 provided on the sub-beam 21, thereby fixing the sub-beam 21 to the battery side beam.

[0078] It is worth noting that the step of fixing the battery side frame 1 to the battery side frame 1 can be performed after the sub-modules at both ends of the support beam 2 in the length direction are placed into the battery side frame 1, or it can be performed after all the sub-modules are placed in the battery side frame 1.

[0079] After the support beam 2 and the battery side frame 1 are fixedly connected by threaded fasteners, the support beam 2 and the battery side frame 1 are welded and fixed, which can further improve the connection stability between the support beam 2 and the battery side frame 1, thereby further improving the overall structural stability of the battery box. It is worth noting that the welding step can be performed immediately after the support beam 2 and the battery side frame 1 are fixedly connected by threaded fasteners, or at other times, for example, the welding step can be used as the last step of the entire box-entering process.

[0080] Optionally, when the sub-beam 21 for fixed connection with the battery side frame 1 includes a body 211 and a connector 212, when the sub-beam 21 and the battery cells located on both sides of the sub-beam 21 along the length direction of the support beam 2 are pre-assembled into a sub-module, the connector 212 is fixedly connected to the body 211 to form the sub-beam 21. The specific connection method may include but is not limited to bonding, welding, etc.

[0081] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

[0082] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery box, used in automobiles, characterized in that: include: Battery side frame and support beam; wherein, The support beam is located in the battery side frame and divides the space for accommodating the battery cell into at least two sub-spaces in the battery side frame; The support beam comprises at least two sections of sub-beams arranged in a single row, and the two sections of sub-beams located at the two ends of the support beam are respectively fixedly connected to the battery side frames; the opposite ends of any two adjacent sections of sub-beams are provided with positioning concave ends and positioning convex ends in a one-to-one correspondence, and the concave direction of the positioning concave ends and the convex direction of the positioning convex ends are both along the length direction of the support beam; Along the width direction of the support beam, there is a gap between the positioning concave end and the positioning convex end for absorbing the stacking tolerance of the battery cells.

2. The battery box according to claim 1, characterized in that: The positioning protrusion includes a boss protruding relative to the end of the sub-beam where the positioning protrusion is located along the length direction of the support beam; along the width direction of the support beam, there is a gap between the boss and both ends of the sub-beam where the positioning protrusion is located; The positioning concave end includes a groove that is recessed relative to the end of the sub-beam where the positioning concave end is located along the length direction, and along the width direction of the support beam, there is a gap between the groove and both ends of the sub-beam where the positioning concave end is located.

3. The battery box according to claim 2, characterized in that: Along the length direction of the support beam, the protruding length of the boss relative to the sub-beam is L1; along the width direction of the support beam, the width of the sub-beam is L2; 8≥L2 / L1≥4.

4. The battery box according to claim 1, characterized in that: An oblong hole is provided at the end of the sub-beam for being fixedly connected to the battery side frame; the waist length of the oblong hole is along the width direction of the support beam; The oblong hole is used for passing a threaded fastener, and the sub-beam is fixedly connected to the battery side frame through the threaded fastener.

5. The battery case according to any one of claims 1 to 4, characterized in that: The length direction of the support beam is parallel to the width direction of the vehicle body, and the central axis of the vehicle body in the width direction is taken as the axis of symmetry. The positioning protruding end and the positioning concave end are axially symmetrically distributed on the support beam.

6. The battery case according to claim 5, characterized in that: The support beam includes three sections of sub-beams, and each section of the sub-beam corresponds to the same number of battery cells along the length direction of the support beam.

7. A boxing method, applied to a battery box, characterized in that: The battery box is a battery box as claimed in any one of claims 1 to 6; the method comprises: Pre-installing each section of the sub-beam and the battery cells located on both sides of the sub-beam along the length direction of the support beam into a sub-module; All submodules are placed in the battery side frame, and the positioning convex end of each subbeam is embedded into the positioning concave end of the adjacent subbeam; and the assembly tolerance is absorbed by the gap between the positioning concave end and the positioning convex end; The positioning convex end and the positioning concave end are fixedly connected to form a support beam.

8. The method according to claim 7, characterized in that The positioning convex end and the positioning concave end are fixedly connected to form a support beam, specifically: The positioning convex end and the positioning concave end are welded and fixed.

9. The method according to claim 7, characterized in that: When the sub-beam for being fixedly connected to the battery side frame is fixedly connected to the battery side frame by a threaded fastener, the method further comprises: The sub-beam used for being fixedly connected to the battery side frame is fixedly connected to the battery side frame by means of threaded fasteners; The sub-beam used for fixed connection with the battery side frame is welded and fixed to the battery side frame.

10. The method according to any one of claims 7 to 9, characterized in that: All submodules are placed in the battery side frame, and the positioning convex end of each subbeam is embedded into the positioning concave end of the adjacent subbeam, specifically: Place two submodules close to the battery side frames on both sides along the length direction of the support beam into the accommodation space, and fix the two sections of the sub-beams of the two submodules to the battery side frames respectively; Starting from the submodules located at the two ends of the support beam in the length direction, other submodules are placed in sequence toward the middle.

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