Battery module, method for preparing battery module and energy storage device

Abstract

The present application discloses a battery module, a method for preparing the battery module and an energy storage device. The battery module includes a shell, a first support member and a battery cell assembly. The battery cell assembly is arranged in the shell. The shell includes a bottom wall and a top wall arranged opposite to each other along a first direction, and a first side wall and a second side wall arranged opposite to each other along a second direction. The first side wall includes a first main body and a first bending portion. Along the first direction, the first bending portion is located on a side of the top wall away from the bottom wall. The top wall includes a first fixing portion located below the first bending portion. The first support member is arranged on the first side wall, the first support member supports the first fixing portion, and the first support member protrudes from the first main body. The first bending portion is used to limit the top wall in the first direction. The first support member supports the first fixing portion.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery module, a method for preparing the battery module, and an energy storage device. Background Art

[0002] Currently, battery modules are widely used in drones, electric vehicles, smart energy storage devices, etc. As the length of the battery module increases, the top wall of the existing shell collapses downward to form a gap, which increases the risk of foreign matter entering the shell and affects the safety of the battery module. Summary of the invention

[0003] In view of this, it is necessary to provide a battery module, a method for preparing the battery module and an energy storage device, which can improve the safety of the battery module.

[0004] An embodiment of the present application provides a battery module, which includes a shell, a first support member and a battery cell assembly. The battery cell assembly is arranged in the shell. The shell includes a bottom wall and a top wall arranged opposite to each other along a first direction, and a first side wall and a second side wall arranged opposite to each other along a second direction. The first side wall includes a first main body and a first bending portion. Along the first direction, the first bending portion is located on the side of the top wall away from the bottom wall. The top wall includes a first fixing portion located below the first bending portion. The first support member is arranged on the first side wall, the first support member supports the first fixing portion, and the first support member protrudes from the first main body. The first bending portion is used to limit the top wall in the first direction. The first support member supports the first fixing portion to support the top wall in the first direction, reduce the risk of the top wall collapsing downward, and thus help to reduce the gap between the top wall and the first bending portion, thereby improving the safety of the battery module.

[0005] In one or more optional embodiments above, along the third direction, the length of the top wall is L1, 700mm≤L1≤1200mm, and the first direction, the second direction and the third direction are perpendicular to each other, so as to extend the length of the shell and expand the capacity of the battery module.

[0006] In one or more optional embodiments above, along the first direction, the first fixing portion and the first bending portion are in contact and connected to improve the stability of the connection between the top wall and the first side wall.

[0007] In one or more optional embodiments above, along the first direction, a first gap is formed between the first fixing portion and the first bending portion, and the length of the first gap is H1,0

[0008] ​In one or more optional embodiments above, the first fixing portion includes a first section and a second section, the first section and the first bending portion are sequentially arranged along the first direction, and the first body portion and the second section are sequentially arranged along the second direction, so that the shape of the first fixing portion is adapted to the first side wall. Along the first direction, the first support member supports the second section to improve the stability of the first support member supporting the top wall.

[0009] In one or more of the above optional embodiments, the first fixing portion includes a first bending section, and the first bending section is connected between the first section and the second section to relieve stress between the first section and the second section and improve the structural stability of the first fixing portion.

[0010] In one or more optional embodiments above, the second section includes a first sub-section, a second bending section, and a second sub-section. The first sub-section is connected to the first section. Along the second direction, the second sub-section is located on a side of the first sub-section away from the first main body. The second bending section is connected between the first sub-section and the second sub-section, and the first support member directly supports the second bending section. The first sub-section, the second bending section, and the second sub-section can improve the structural strength of the second section, reduce the risk of deformation of the first fixing portion, and thereby improve the stability of the first support member supporting the top wall.

[0011] In one or more of the above optional embodiments, along the first direction, the projection of the second section is located within the projection of the first support member to reduce the risk of the second section falling off the first support member and improve the stability of the first support member in supporting the top wall.

[0012] In one or more of the above optional embodiments, along the second direction, the first support member extends beyond the second section, which is beneficial for the first support member to better support the second section.

[0013] In one or more optional embodiments above, the top wall includes a first portion, a third connecting portion connecting the first portion and the first section, and along a direction opposite to the first direction, the first section is closer to the bottom wall than the first portion. The third connecting portion is used to provide a buffer between the first portion and the first section to reduce the risk of deformation of the first portion when the first support member supports the first section.

[0014] In one or more of the above optional embodiments, when viewed along the third direction, the third connecting portion extends along an arc.

[0015] In one or more optional embodiments above, along the second direction, the projection of the first bent portion overlaps with the first portion, so that the first bent portion and the first portion share a space in the first direction, thereby improving space utilization of the shell.

[0016] In one or more optional embodiments above, the housing includes a rear wall and a front wall arranged relatively to each other along a third direction, the battery cell assembly is located between the front wall and the rear wall, and the front wall is connected to the top wall and the bottom wall. The front wall and the rear wall are configured to apply pressure to the battery cell assembly. The top wall is fixed to the front wall and the rear wall. The front wall supports the top wall through the first connecting portion to reduce the risk of the top wall collapsing downward, thereby facilitating the reduction of the gap between the top wall and the first bending portion and improving the safety of the battery module. The second connecting portion is fixed to the rear wall to improve the stability of the connection between the top wall and the rear wall.

[0017] In one or more optional embodiments above, the housing includes a front cover, the top wall includes a second fixing portion, and the second fixing portion is located between the front cover and the front wall. The front cover, the second fixing portion and the front wall are fixed to improve the stability of the connection between the front cover, the top wall and the front wall.

[0018] In one or more of the above optional embodiments, the front cover, the second fixing portion and the front wall are connected by fasteners, such as screws.

[0019] In one or more optional embodiments above, the bottom wall includes a first extension portion toward the first support member. Along the first direction, the first extension portion abuts against the first support member, and the bottom wall supports the battery cell assembly. The first support member applies pressure to the bottom wall in a direction opposite to the first direction through the first extension portion to reduce the risk of the side edge of the bottom wall warping up, thereby facilitating the reduction of the gap between the bottom wall and the first side wall, and improving the safety of the battery module.

[0020] In one or more optional embodiments above, the first side wall includes a second bent portion, and the second bent portion is located on a side of the bottom wall away from the top wall in a direction opposite to the first direction. The first support member applies pressure to the bottom wall through the first extension portion to reduce the risk of the side edge of the bottom wall warping up, thereby facilitating the reduction of the gap between the bottom wall and the second bent portion, thereby improving the safety of the battery module.

[0021] In one or more optional embodiments above, the second side wall includes a second main body portion and a third bent portion. Along the first direction, the third bent portion is located on the side of the top wall away from the bottom wall. The top wall includes a third fixing portion located below the third bent portion. The battery module includes a second support member provided on the second side wall, the second support member supports the third fixing portion, and the second support member protrudes from the second main body portion. The third bent portion is used to limit the top wall in the first direction. The second support member supports the fourth fixed portion to support the top wall in the first direction, reduce the risk of the top wall collapsing downward, and thereby help to reduce the gap between the top wall and the third bent portion, thereby improving the safety of the battery module.

[0022] In one or more of the above optional embodiments, the battery cell assembly includes a plurality of battery cell units arranged along a third direction, the battery cell units include a battery cell shell and electrode terminals, the battery cell shell and the first main body are spaced apart along the second direction and form a third gap, the electrode terminal extends from the battery cell shell and is located in the third gap, and the first support member is arranged in the third gap to improve space utilization in the shell.

[0023] In one or more of the above optional embodiments, the first support member is welded to the first main body portion or fixed to the first main body portion by fasteners, so that the first support member can improve the structural strength of the first main body portion while playing a supporting role.

[0024] The embodiment of the present application provides a method for preparing a battery module, comprising the following steps: The battery cell assembly is arranged on the bottom wall; Install the top wall; The first side wall is moved toward the battery core assembly along the second direction, and the first support member enables the first fixing portion to move upward, and the first support member supports the first fixing portion.

[0025] An embodiment of the present application provides an energy storage device, comprising a battery module in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a battery module in some embodiments is shown.

[0027] Figure 2 Schematic diagrams of the exploded view of the battery module in some embodiments are shown.

[0028] Figure 3 A schematic structural diagram of the connection between the first side wall and the first support member of the battery module in some embodiments is shown.

[0029] Figure 4 Shows Figure 1 Section view along section line AA.

[0030] Figure 5 Shows Figure 4 A magnified schematic diagram of point B in the middle.

[0031] Figure 6 Shows Figure 4 Enlarged schematic diagram of point C in the middle.

[0032] Figure 7 Schematic diagrams of the structures of the top walls in some embodiments are shown.

[0033] Figure 8 Schematic diagrams of the structure of the bottom wall in some embodiments are shown.

[0034] Fig. 9 A schematic diagram of the structure of a battery cell assembly in some embodiments is shown.

[0035] Fig.10 A flow chart showing a method for preparing a battery module in some embodiments.

[0036] Fig.11 A schematic diagram of the structure of an energy storage device in some embodiments is shown.

[0037] Description of main component symbols: Battery module 100 Housing 10 First gap 10A Second gap 10B The third gap 10C Bottom wall 11 The first extension portion 111 The first extension section 1111 The second extension section 1112 The second extension portion 112 The third extension portion 113 Fourth extension portion 114 Sixth extension portion 116 Top wall 12 The first fixing portion 121 First paragraph 1211 Second paragraph 1212 First sub-segment 1212A Second bending section 1212B Second sub-segment 1212C The first bending section 1213 The first connection portion 122 The second connection portion 123 The second fixing portion 124 Part 1126 The third connection portion 127 Fourth fixing portion 128 First side wall 13 First body part 131 The first bending portion 132 The second bending portion 133 Second side wall 14 The second body portion 141 The third bending portion 142 Fourth bending portion 143 Back wall 15 Front wall 16 Front cover 17 Battery cell assembly 20 Battery cell 21 Battery shell 211 Electrode terminal 212 The first support member 30 First supporting surface 31 First chamfered surface 32 The second support member 40 The first buffer member 51 Second buffer member 52 Cabinet 90 Energy storage equipment 200 First direction Z Second direction X The third direction Y The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0039] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element at the same time. When an element is considered to be "disposed" or "disposed on" another element, it may be directly disposed on the other element or there may be a centrally disposed element at the same time.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] It should be understood that, considering the factors of actual processing tolerance, the term "perpendicular" in the technical solution of the present application is used to describe the ideal state between two components. In the actual production or use state, there may be a state that is approximately perpendicular between the two components. For example, in combination with the numerical description, perpendicularity may refer to the angle range between two straight lines being between 90°±10°, perpendicularity may also refer to the dihedral angle range between two planes being between 90°±10°, and perpendicularity may also refer to the angle range between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic point of view, the components can be considered to be "straight lines" or "planes" if the overall extension direction is a straight line or a plane.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0043] The terms "left", "right", "top", "bottom", "front", "back" and similar expressions used herein are for illustrative purposes only and are not intended to limit the present application.

[0044] Unless otherwise defined, when the term “plurality” is used to describe the number of components, it specifically means that the number of the components is two or more.

[0045] In the first direction Z, it includes along the first direction Z and along the direction opposite to the first direction Z, in the second direction X, it includes along the second direction X and along the direction opposite to the second direction X, and in the third direction Y, it includes along the third direction Y and along the direction opposite to the third direction Y.

[0046] An embodiment of the present application provides a battery module, which includes a shell, a first support member and a battery cell assembly. The battery cell assembly is arranged in the shell. The shell includes a bottom wall and a top wall arranged opposite to each other along a first direction, and a first side wall and a second side wall arranged opposite to each other along a second direction. The first side wall includes a first main body portion and a first bending portion, and along the first direction, the first bending portion is located on the side of the top wall away from the bottom wall. The top wall includes a first fixing portion located below the first bending portion. The first support member is arranged on the first side wall, the first support member supports the first fixing portion, and the first support member protrudes from the first main body portion. The first bending portion is used to limit the top wall in the first direction. The first support member supports the first fixing portion to support the top wall in the first direction, reduce the risk of the top wall collapsing downward, and then help to reduce the gap between the top wall and the first bending portion, thereby improving the safety of the battery module.

[0047] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0048] See also Figure 1 and Figure 2 An embodiment of the present application provides a battery module 100 , including a housing 10 and a battery cell assembly 20 . The battery cell assembly 20 is disposed in the housing 10 .

[0049] In some embodiments, the housing 10 includes a bottom wall 11 and a top wall 12 that are oppositely disposed along a first direction Z, and a first side wall 13 and a second side wall 14 that are oppositely disposed along a second direction X. The first direction Z is perpendicular to the second direction X. The battery cell assembly 20 is located in a space enclosed by the bottom wall 11, the top wall 12, the first side wall 13, and the second side wall 14.

[0050] In some embodiments, the first side wall 13 includes a first body portion 131 , and the first body portion 131 is disposed opposite to the battery cell assembly 20 along the second direction X.

[0051] In some embodiments, the first side wall 13 includes a first bending portion 132. Along the first direction Z, the first bending portion 132 is connected to a side of the first main body portion 131 close to the top wall 12 and is bent relative to the first main body portion 131. The first bending portion 132 is located on a side of the top wall 12 away from the bottom wall 11.

[0052] In some embodiments, the top wall 12 includes a first fixing portion 121 located below the first bending portion 132 , and the first bending portion 132 is used to limit the top wall 12 in the first direction Z.

[0053] See also Figure 3 , Figure 4 and Figure 5 In some embodiments, the battery module 100 includes a first support member 30, which is disposed on the first side wall 13. The first support member 30 is disposed on the side of the first body portion 131 facing the battery cell assembly 20. The first support member 30 protrudes from the first body portion 131, and the first support member 30 supports the first fixing portion 121 to support the top wall 12 in the first direction Z, thereby reducing the risk of the top wall 12 collapsing downward, thereby facilitating the reduction of the gap between the top wall 12 and the first bending portion 132, and improving the safety of the battery module 100.

[0054] See also Figures 3 to 5 In some embodiments, the first support member 30 is welded to the first main body portion 131 or fixed to the first main body portion 131 by fasteners, so that the first support member 30 can improve the structural strength of the first main body portion 131 while playing a supporting role.

[0055] See also Figure 5 In some embodiments, the first support member 30 includes a first support surface 31 and a first chamfered surface 32, the first support surface 31 supports the first fixing portion 121, and the first chamfered surface 32 is located on one side of the first support surface 31 along the second direction X. The first chamfered surface 32 is used to guide the first fixing portion 121 during the installation of the first side wall 13 and the top wall 12, thereby improving the convenience of installation.

[0056] See also Figures 1 to 3 In some embodiments, the housing 10 includes a rear wall 15 and a front wall 16 that are arranged opposite to each other in a third direction Y, the battery cell assembly 20 is located between the rear wall 15 and the front wall 16, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0057] In some embodiments, along the third direction Y, the first support member 30 is centrally disposed on the first side wall 13 to support a portion of the top wall 12 that may collapse and to facilitate uniform force on the top wall 12 .

[0058] In some embodiments, there are multiple first support members 30 , and the multiple first support members 30 are arranged in sequence along the third direction Y to improve the stability of the first support members 30 supporting the top wall 12 .

[0059] In some embodiments, along the third direction Y, a plurality of first support members 30 are arranged at equal intervals, which is beneficial for making the force on the top wall 12 uniform.

[0060] See also Figure 1 and Figure 2 In some embodiments, along the third direction Y, the length of the top wall 12 is L1, 700mm≤L1≤1200mm, so as to extend the length of the shell 10 and expand the capacity of the battery module 100.

[0061] Optionally, L1 may be 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, 1200 mm, or any other value within the range of 700 mm ≤ L1 ≤ 1200 mm.

[0062] See also Figure 5 In some embodiments, the support of the first support member 30 can reduce the gap between the first fixing portion 121 and the first bending portion 132. A first gap 10A is formed between the first fixing portion 121 and the first bending portion 132. Along the first direction Z, the length of the first gap 10A is H1,0

[0063] ​Optionally, H1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, and 0.

[0064] In some embodiments, the first gap 10A is filled with a buffer or an insulating member to improve the stability of the connection between the top wall 12 and the first side wall 13. Optionally, the buffer or insulating member in the first gap 10A is compressed by the first fixing portion 121 and the first bending portion 132.

[0065] In some embodiments, along the first direction Z, the first fixing portion 121 is in contact and connected with the first bending portion 132 to improve the stability of the connection between the top wall 12 and the first side wall 13 .

[0066] See also Figure 5 In some embodiments, the first fixing portion 121 includes a first section 1211 and a second section 1212, the first section 1211 and the first bending portion 132 are sequentially arranged along the first direction Z, and the first body portion 131 and the second section 1212 are sequentially arranged along the second direction X, so that the shape of the first fixing portion 121 is adapted to the first side wall 13. Along the first direction Z, the first support member 30 supports the second section 1212 to improve the stability of the first support member 30 supporting the top wall 12.

[0067] In some embodiments, along the second direction X, a second gap 10B is defined between the first body portion 131 and the second segment 1212 .

[0068] In some embodiments, the second gap 10B is used to fill a buffer or an insulating member to improve the stability of the connection between the top wall 12 and the first side wall 13 .

[0069] In some embodiments, along the second direction X, the first body portion 131 and the second segment 1212 are directly connected in contact with each other to improve the stability of the connection between the top wall 12 and the first side wall 13 .

[0070] See also Figure 5 In some embodiments, the first fixing portion 121 includes a first bending section 1213 , and the first bending section 1213 is connected between the first section 1211 and the second section 1212 to relieve stress between the first section 1211 and the second section 1212 and improve the structural stability of the first fixing portion 121 .

[0071] See also Figure 5 ​In some embodiments, the second section 1212 includes a first sub-segment 1212A, a second bending section 1212B, and a second sub-segment 1212C. The first sub-segment 1212A is connected to the first section 1211. Along the second direction X, the second sub-segment 1212C is located on a side of the first sub-segment 1212A away from the first body portion 131. The second bending section 1212B is connected between the first sub-segment 1212A and the second sub-segment 1212C, and the first support member 30 directly supports the second bending section 1212B. The first sub-segment 1212A, the second bending section 1212B, and the second sub-segment 1212C can improve the structural strength of the second section 1212, reduce the risk of deformation of the first fixing portion 121, and thereby improve the stability of the first support member 30 supporting the top wall 12.

[0072] In some embodiments, the first fixing portion 121 may not include the second section 1212 , and the first support member 30 directly supports the first section 1211 .

[0073] See also Figure 5 In some embodiments, along the first direction Z, the projection of the second section 1212 is located within the projection of the first support member 30 to reduce the risk of the second section 1212 falling off the first support member 30 and improve the stability of the first support member 30 in supporting the top wall 12.

[0074] In some embodiments, along the second direction X, the first support member 30 extends beyond the second section 1212 , which helps the first support member 30 to better support the second section 1212 .

[0075] See also Figure 2 and Figure 7 In some embodiments, the top wall 12 includes a first connecting portion 122 connected to the first fixing portion 121, and the front wall 16 supports the top wall 12 through the first connecting portion 122 to reduce the risk of the top wall 12 collapsing downward, thereby helping to narrow the gap between the top wall 12 and the first bending portion 132, thereby improving the safety of the battery module 100.

[0076] In some embodiments, along the first direction Z, the end surface of the front wall 16 away from the bottom wall 11 directly supports the first connection portion 122 to improve the stability of the front wall 16 supporting the first connection portion 122 .

[0077] See also Figure 2 and Figure 7 In some embodiments, the top wall 12 includes a second connection portion 123 connected to the first fixing portion 121 , and the second connection portion 123 is disposed opposite to the rear wall 15 along the third direction Y. The second connection portion 123 is fixed to the rear wall 15 to improve the stability of the connection between the top wall 12 and the rear wall 15 .

[0078] In some embodiments, the second connection portion 123 is connected to the rear wall 15 via a fastener, such as a screw.

[0079] See also Figure 1 and Figure 2 In some embodiments, the housing 10 includes a front cover 17. The top wall 12 includes a second fixing portion 124, and the second fixing portion 124 is located between the front cover 17 and the front wall 16. The front cover 17, the second fixing portion 124 and the front wall 16 are fixed to improve the stability of the connection between the front cover 17, the top wall 12 and the front wall 16.

[0080] In some embodiments, the front cover 17, the second fixing portion 124 and the front wall 16 are connected by fasteners, such as screws.

[0081] See also Figure 2 and Figure 7 In some embodiments, the front wall 16 and the rear wall 15 are configured to apply pressure to the battery cell assembly 20. When the battery cell assembly 20 expands, the battery cell assembly 20 applies pressure along the third direction Y to the front wall 16, and the front wall 16 stretches the top wall 12 through the second fixing portion 124 to reduce the risk of the top wall 12 collapsing downward, thereby helping to reduce the gap between the top wall 12 and the first bending portion 132, thereby improving the safety of the battery module 100.

[0082] In some embodiments, the battery cell assembly 20 applies pressure to the rear wall 15 in a direction opposite to the third direction Y, and the rear wall 15 stretches the top wall 12 through the second connecting portion 123 to reduce the risk of the top wall 12 collapsing downward, thereby helping to narrow the gap between the top wall 12 and the first bending portion 132, thereby improving the safety of the battery module 100.

[0083] See also Figure 5 and Figure 7 In some embodiments, the top wall 12 includes a first portion 126 and a third connecting portion 127 connecting the first portion 126 and the first segment 1211. In a direction opposite to the first direction Z, the first segment 1211 is closer to the bottom wall 11 than the first portion 126. The third connecting portion 127 is used to provide a buffer between the first portion 126 and the first segment 1211, so as to reduce the risk of deformation of the first portion 126 when the first support member 30 supports the first segment 1211.

[0084] See also Figure 5 In some embodiments, when viewed along the third direction Y, the third connecting portion 127 extends along an arc.

[0085] See also Figure 5 In some embodiments, when viewed along the third direction Y, the third connection portion 127 is displayed along a straight line, which extends along the first direction Z or is inclined relative to the first direction Z and the second direction X.

[0086] In some embodiments, along the second direction X, the projection of the first bent portion 132 overlaps with the first portion 126 , so that the first bent portion 132 and the first portion 126 share a space in the first direction Z, thereby improving space utilization of the housing 10 .

[0087] See also Figure 2 , Figure 6 and Figure 8 In some embodiments, the bottom wall 11 includes a first extension portion 111 facing the first support member 30. Along the first direction Z, the first extension portion 111 abuts against the first support member 30, and the bottom wall 11 supports the battery cell assembly 20. Under the action of gravity, the battery cell assembly 20 may cause the side of the bottom wall 11 to warp upward, and the first support member 30 applies pressure in the direction opposite to the first direction Z to the bottom wall 11 through the first extension portion 111 to reduce the risk of the side of the bottom wall 11 warping upward, thereby facilitating the reduction of the gap between the bottom wall 11 and the first side wall 13, and improving the safety of the battery module 100.

[0088] See also Figure 2 , Figure 6 and Figure 8 In some embodiments, the first side wall 13 includes a second bending portion 133. The second bending portion 133 is connected to a side of the first body portion 131 close to the bottom wall 11 and is bent relative to the first body portion 131 in a direction opposite to the first direction Z. The second bending portion 133 is located on a side of the bottom wall 11 away from the top wall 12. The first support member 30 applies pressure in a direction opposite to the first direction Z to the bottom wall 11 through the first extension portion 111 to reduce the risk of the side edge of the bottom wall 11 warping up, thereby facilitating the reduction of the gap between the bottom wall 11 and the second bending portion 133, thereby improving the safety of the battery module 100.

[0089] In some embodiments, the first support member 30 applies pressure to the bottom wall 11 to reduce the gap between the second bending portion 133 and the first extending portion 111. A gap is formed between the second bending portion 133 and the first extending portion 111.

[0090] In some embodiments, the gap between the second bend portion 133 and the first extension portion 111 is filled with a buffer or an insulating member to improve the stability of the connection between the bottom wall 11 and the first side wall 13. Optionally, the buffer or insulating member in the gap between the second bend portion 133 and the first extension portion 111 is in a state of being compressed by the second bend portion 133 and the first extension portion 111.

[0091] In some embodiments, along the first direction Z, the second bending portion 133 is in contact with and connected to the first extending portion 111 to improve the stability of the connection between the bottom wall 11 and the first side wall 13 .

[0092] See also Figure 6 and Figure 8 In some embodiments, the first extension portion 111 includes a first extension segment 1111 and a second extension segment 1112, the second bending portion 133 and the first extension segment 1111 are sequentially arranged along the first direction Z, and the first body portion 131 and the second extension segment 1112 are sequentially arranged along the second direction X, so that the shape of the first extension portion 111 is adapted to the first side wall 13. Along the first direction Z, the second bending portion 133 supports the first support member 30 to improve the stability of the first support member 30 applying pressure to the first extension portion 111.

[0093] In some embodiments, along the second direction X, a gap is defined between the first body portion 131 and the second extension segment 1112 .

[0094] In some embodiments, the gap between the first body portion 131 and the second extension segment 1112 is used to fill a buffer or an insulating member to improve the stability of the connection between the bottom wall 11 and the first side wall 13 .

[0095] In some embodiments, along the second direction X, the first body portion 131 and the second extension segment 1112 are directly contacted and connected to improve the stability of the connection between the bottom wall 11 and the first side wall 13 .

[0096] See also Figure 6 In some embodiments, along the direction opposite to the first direction Z, the projection of the second extension segment 1112 is located within the projection of the first support member 30 to reduce the risk of the second extension segment 1112 falling off the first support member 30 and improve the stability of the pressure applied by the first support member 30 on the first extension portion 111.

[0097] In some implementations, along the second direction X, the first support member 30 extends beyond the second extension segment 1112 , which helps the first support member 30 to better apply pressure to the first extension portion 111 .

[0098] See also Figure 2 and Figure 8 In some embodiments, the bottom wall 11 includes a second extension portion 112 connected to the first extension portion 111, and the second extension portion 112 is fixed to the front wall 16. The front wall 16 applies pressure to the bottom wall 11 through the second extension portion 112 to reduce the risk of the side of the bottom wall 11 warping up, which is beneficial to narrowing the gap between the bottom wall 11 and the second bending portion 133, thereby improving the safety of the battery module 100.

[0099] In some embodiments, along the first direction Z, the second extension portion 112 directly contacts the end surface of the front wall 16 away from the top wall 12 , so as to improve the stability of the pressure applied by the front wall 16 to the second extension portion 112 .

[0100] See also Figure 2 and Figure 8 In some embodiments, the bottom wall 11 includes a third extension portion 113 connected to the first extension portion 111 , and the third extension portion 113 is disposed opposite to the rear wall 15 along the third direction Y. The third extension portion 113 is fixed to the rear wall 15 to improve the stability of the connection between the bottom wall 11 and the rear wall 15 .

[0101] In some embodiments, the third extension 113 and the rear wall 15 are connected by fasteners, such as screws.

[0102] See also Figure 2 and Figure 8 In some embodiments, the bottom wall 11 includes a fourth extension portion 114, and the fourth extension portion 114 is located between the front cover 17 and the front wall 16. The front cover 17, the fourth extension portion 114 and the front wall 16 are fixed to improve the stability of the connection between the front cover 17, the bottom wall 11 and the front wall 16.

[0103] In some embodiments, the front cover 17, the fourth extension 114, and the front wall 16 are connected by fasteners, such as screws.

[0104] In some embodiments, the front wall 16 and the rear wall 15 are configured to apply pressure to the battery cell assembly 20. When the battery cell assembly 20 expands, the battery cell assembly 20 applies pressure along the third direction Y to the front wall 16, and the front wall 16 stretches the bottom wall 11 through the third extension portion 113 to reduce the risk of the side of the bottom wall 11 warping up, thereby helping to reduce the gap between the bottom wall 11 and the second bending portion 133, thereby improving the safety of the battery module 100.

[0105] In some embodiments, the battery cell assembly 20 applies pressure to the rear wall 15 in a direction opposite to the third direction Y, and the rear wall 15 stretches the bottom wall 11 through the third extension portion 113 to reduce the risk of the side of the bottom wall 11 warping up, which is beneficial to narrowing the gap between the bottom wall 11 and the second bending portion 133, thereby improving the safety of the battery module 100.

[0106] See also Figure 2 , Figure 4 and Fig. 9 In some embodiments, the battery cell assembly 20 includes a plurality of battery cell units 21 arranged along the third direction Y. The battery cell unit 21 includes a battery cell housing 211 and two electrode terminals 212. The battery cell housing 211 and the first body portion 131 are spaced apart along the second direction X and form a third gap 10C. At least one electrode terminal 212 extends from the battery cell housing 211 and is located in the third gap 10C. The first support member 30 is disposed in the third gap 10C to improve the space utilization rate in the housing 10.

[0107] In some embodiments, the battery module 100 includes a first buffer member 51, and the first buffer member 51 is disposed in the third gap 10C. Optionally, the first buffer member 51 includes foam.

[0108] See also Figure 2 , Figure 4 and Figure 7 In some embodiments, the second side wall 14 includes a second main body portion 141 and a third bending portion 142. Along the first direction Z, the third bending portion 142 is connected to a side of the second main body portion 141 close to the top wall 12 and is bent relative to the second main body portion 141. The third bending portion 142 is located on a side of the top wall 12 away from the bottom wall 11.

[0109] In some embodiments, the top wall 12 includes a fourth fixing portion 128 located below the third bending portion 142 , and the third bending portion 142 is used to limit the top wall 12 in the first direction Z.

[0110] In some embodiments, the battery module 100 includes a second buffer member 52, and the second buffer member 52 is disposed between the second body portion 141 and the battery cell assembly 20. Optionally, the second buffer member 52 includes foam.

[0111] See also Figure 2 , Figure 4 and Figure 7 In some embodiments, the battery module 100 includes a second support member 40 disposed on the second side wall 14. The second support member 40 is disposed on the side of the second body portion 141 facing the battery cell assembly 20. The second support member 40 protrudes from the second body portion 141, and the second support member 40 supports the fourth fixing portion 128 to support the top wall 12 in the first direction Z, thereby reducing the risk of the top wall 12 collapsing downward, thereby facilitating the reduction of the gap between the top wall 12 and the third bending portion 142, and improving the safety of the battery module 100.

[0112] See also Figure 2 , Figure 4 and Figure 8 In some embodiments, the bottom wall 11 includes a sixth extension portion 116 facing the second support member 40. Along the first direction Z, the sixth extension portion 116 abuts against the second support member 40. The second support member 40 applies pressure in a direction opposite to the first direction Z to the bottom wall 11 through the sixth extension portion 116, so as to reduce the risk of the side edge of the bottom wall 11 warping up, thereby facilitating the reduction of the gap between the bottom wall 11 and the second side wall 14, and improving the safety of the battery module 100.

[0113] See also Figure 2 , Figure 4 and Figure 8In some embodiments, the second side wall 14 includes a fourth bending portion 143, which is connected to a side of the first body portion 131 close to the bottom wall 11 and bent relative to the first body portion 131 in a direction opposite to the first direction Z. The fourth bending portion 143 is located on a side of the bottom wall 11 away from the top wall 12. The second support member 40 applies pressure in a direction opposite to the first direction Z to the bottom wall 11 through the sixth extension portion 116 to reduce the risk of the side edge of the bottom wall 11 warping up, thereby facilitating the reduction of the gap between the bottom wall 11 and the fourth bending portion 143, thereby improving the safety of the battery module 100.

[0114] See also Fig.10 The present application also provides a method for preparing a battery module 100, comprising the following steps: The battery cell assembly 20 is arranged on the bottom wall 11; Install the top wall 12; The first side wall 13 is moved toward the battery cell assembly 20 along the second direction X, and the first support member 30 enables the first fixing portion 121 to move upward, and the first support member 30 supports the first fixing portion 121 .

[0115] In the manufacturing method of the battery module 100, the top wall 12 is installed first, and then the first side wall 13 is installed, so that the first bent portion 132 is located on the side of the top wall 12 away from the bottom wall 11, and the first support member 30 supports the first fixing portion 121. The first support member 30 supports the top wall 12 in the first direction Z, reducing the risk of the top wall 12 collapsing downward, thereby helping to reduce the gap between the top wall 12 and the first bent portion 132, and improving the safety of the battery module 100.

[0116] See also Fig.11 The present application also provides an energy storage device 200, and the energy storage device 200 includes the battery module 100 in any one of the above embodiments.

[0117] In some embodiments, the energy storage device 200 includes a cabinet 90, in which the battery module 100 is disposed, and the cabinet 90 is used to protect the battery module 100. Optionally, one or more battery modules 100 are disposed in the cabinet 90.

[0118] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery module, characterized in that: include: The housing comprises a bottom wall and a top wall arranged opposite to each other along a first direction, and a first side wall and a second side wall arranged opposite to each other along a second direction, wherein the first side wall comprises a first body portion and a first bending portion, wherein the first bending portion is located at a side of the top wall away from the bottom wall along the first direction, and the top wall comprises a first fixing portion located below the first bending portion; A first support member, disposed on the first side wall, the first support member supports the first fixing portion, and the first support member protrudes from the first main body portion; The battery core assembly is arranged in the shell.

2. The battery module according to claim 1, characterized in that: Along the third direction, the length of the top wall is L1, 700mm≤L1≤1200mm, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery module according to claim 1 or 2, characterized in that: Along the first direction, the first fixing portion and the first bending portion are in contact and connection; Or along the first direction, a first gap is formed between the first fixing portion and the first bending portion, and the length of the first gap is H1,0 <H1≤1.5mm。 4. The battery module according to any one of claims 1 to 3, characterized in that: The first fixing portion includes a first section and a second section. The first section and the first bending portion are sequentially arranged along the first direction. The first main body portion and the second section are sequentially arranged along the second direction. Along the first direction, the first supporting member supports the second section.

5. The battery module according to claim 4, characterized in that: Along the first direction, a projection of the second segment is located within a projection of the first support member.

6. The battery module according to claim 4 or 5, characterized in that: The top wall includes a first portion and a third connecting portion connecting the first portion and the first section. Along a direction opposite to the first direction, the first section is closer to the bottom wall than the first portion.

7. The battery module according to any one of claims 1 to 6, characterized in that: The housing comprises a rear wall and a front wall arranged opposite to each other along a third direction, the battery cell assembly is located between the front wall and the rear wall, the front wall is connected to the top wall and the bottom wall, and the front wall and the rear wall are configured to apply pressure to the battery cell assembly; The top wall is fixed to the front wall and the rear wall.

8. The battery module according to claim 7, characterized in that: The shell includes a front cover, the top wall includes a second fixing portion, the second fixing portion is located between the front cover and the front wall, and the front cover, the second fixing portion and the front wall are fixed.

9. The battery module according to any one of claims 1 to 8, characterized in that: The bottom wall comprises a first extension portion facing the first support member, and along the first direction, the first extension portion abuts against the first support member, and the bottom wall supports the battery cell assembly; The first side wall includes a second bent portion, and along a direction opposite to the first direction, the second bent portion is located on a side of the bottom wall away from the top wall.

10. The battery module according to any one of claims 1 to 9, characterized in that: The second side wall includes a second body portion and a third bent portion, along the first direction, the third bent portion is located on a side of the top wall away from the bottom wall, and the top wall includes a third fixing portion located below the third bent portion; The battery module includes a second support member disposed on the second side wall, the second support member supports the third fixing portion, and the second support member protrudes from the second main body portion.

11. The battery module according to any one of claims 1 to 10, characterized in that: The battery cell assembly includes a plurality of battery cell units arranged along a third direction, the battery cell units include a battery cell shell and an electrode terminal, the battery cell shell and the first main body are spaced apart along the second direction and form a third gap, the electrode terminal extends from the battery cell shell and is located in the third gap, and the first support member is disposed in the third gap.

12. A method for preparing a battery module according to any one of claims 1 to 11, characterized in that: The following steps are involved: The battery core assembly is arranged on the bottom wall; Installing the top wall; The first side wall is moved toward the battery core assembly along the second direction, and the first support member causes the first fixing portion to move upward, and the first support member supports the first fixing portion.

13. An energy storage device, characterized in that the energy storage device comprises the battery module according to any one of claims 1 to 11.

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