Battery pack

Abstract

The invention discloses a battery pack which comprises a plurality of battery modules and a module fixing frame, the battery modules are arranged in sequence, each battery module is provided with an end plate, the module fixing frame comprises a main frame body and a plurality of fixing parts, the main frame body is located at the end of each battery module in the length direction, and the fixing parts are arranged on the main frame body. Each fixing part is connected to the main frame body, and each fixing part extends to an end plate of a corresponding battery module and is fixedly connected with the end plate. The fixing parts on the module fixing frame in the battery pack can be fixedly connected to the end plates of the battery modules in the battery pack respectively, so that the composite modules are integrated and fixed, the overall damage resistance of the composite modules is improved, the stability of the whole composite modules is enhanced, and safety design of a battery system is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and more specifically, to a battery pack. Background Art

[0002] A composite module is arranged in the battery pack, and the composite module includes multiple battery modules, and each battery module is arranged in sequence. In the related art, each battery module is bound and fixed by setting a steel belt around the composite module, so that each battery module forms an integral structure. A cooling plate is arranged on the bottom plate of the battery pack, and the bottom of the battery module is bonded to the cooling plate by glue. This fixing method causes the composite module to be subjected to an inward extrusion force, and the forces on each battery cell inside the battery module are uneven. The integrity of the composite module is not good. During long-term use, adjacent battery modules may move relative to each other, which may cause the glue at the bottom of the battery module to be unreliable and partially detached, so that the bottom of the battery cell cannot fully contact the cooling plate, resulting in thermal management failure of each battery cell, which seriously affects the stability of the battery module and is not conducive to the safety design of the battery system.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In order to solve one of the above-mentioned technical defects, a battery pack is provided in an embodiment of the present application.

[0005] This application adopts the following technical solutions:

[0006] A battery pack, comprising:

[0007] A plurality of battery modules, each of which is arranged in sequence, and each of which has an end plate;

[0008] The module fixing frame includes a main frame body and a plurality of fixing parts. The main frame body is located at the end of each battery module along the length direction. Each fixing part is connected to the main frame body. Each fixing part extends to the end plate of the corresponding battery module and is fixedly connected to the end plate.

[0009] Optionally, each of the fixing parts is covered on a thickness end surface of a corresponding end plate, and a connecting hole is provided on the fixing part;

[0010] The connecting piece can be inserted through the connecting hole and the end plate to connect and fix the fixing part and the end plate.

[0011] Optionally, the battery pack includes a box shell and a module fixing beam arranged on the box shell;

[0012] The end plate is provided with a longitudinal through hole;

[0013] The connecting member comprises a rod body and a cap body arranged at one end of the rod body;

[0014] The rod body passes through the connecting hole and the longitudinal through hole and is connected to the module fixing beam, and the cap body is limited to the fixing part.

[0015] Optionally, the main frame includes straight strips;

[0016] The straight strip is located at one end of each of the battery modules, and the straight strip extends along the arrangement direction of each of the battery modules. Each of the fixing parts is arranged on the straight strip, and each of the fixing parts is arranged in sequence and spaced apart along the length direction of the straight strip to extend to the corresponding end plates respectively.

[0017] Optionally, among the fixing parts, the fixing parts located at both ends are respectively connected to the end plates of the two battery modules at both ends, the fixing parts located in the middle respectively cover the gap between the end plates of two adjacent battery modules, and the fixing parts located in the middle are respectively connected to the two adjacent end plates.

[0018] Optionally, the battery pack includes two of the module fixing frames;

[0019] The two module fixing frames are respectively arranged at two ends of the battery module along the length direction;

[0020] Each of the module fixing frames is respectively connected to each end plate on a corresponding side of each battery module.

[0021] Optionally, the battery pack includes a BMS slave;

[0022] A main frame of the module fixing frame has an extension plate, and the extension plate is connected to one side of the straight strip along the width direction;

[0023] The BMS slave is connected to the extension board.

[0024] Optionally, a bent edge is provided on a side of the extension plate facing away from the straight strip;

[0025] The bent edge is used to be connected and fixed to the box shell of the battery pack.

[0026] Optionally, the battery pack includes a busbar and a terminal block;

[0027] The busbar is covered on each of the battery modules, and an aluminum bar group is arranged on the busbar, and the aluminum bar group is connected to the battery cells of each of the battery modules;

[0028] The extension plate is located on one side of the straight strip along the length direction;

[0029] The terminal seat is located on the other side of the straight strip along the length direction, and the terminal seat is electrically connected to the aluminum bar group.

[0030] Optionally, the peripheral side edge of the main frame is bent toward the end plate, so that the edge of the main frame facing away from the end plate is a smoothly transitioned arc surface.

[0031] By adopting the above technical solution, the present application has the following beneficial effects:

[0032] The various fixing parts on the module fixing frame in the battery pack of the present application can be fixedly connected to the end plates of each battery module in the battery pack, thereby integrating and fixing each composite module, improving the overall anti-destruction ability of the composite module, enhancing the stability of the entire composite module, and facilitating the safe design of the battery system.

[0033] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 A partial structural schematic diagram of the interior of a battery pack provided by an embodiment of the present disclosure is shown;

[0036] Figure 2 Another partial structural schematic diagram of the interior of the battery pack provided by the embodiment of the present disclosure is shown;

[0037] Figure 3 A schematic diagram of the structure of a module fixing frame in a battery pack provided by an embodiment of the present disclosure is shown;

[0038] Figure 4 A schematic diagram showing the matching structure of the fixing portion and the end plate of the module fixing frame in the battery pack provided by the embodiment of the present disclosure is shown;

[0039] Figure 5 A schematic structural diagram of a fixing portion of a module fixing frame in a battery pack provided by an embodiment of the present disclosure is shown;

[0040] Figure 6 Show Figure 5 A schematic diagram of the matching structure of the fixing part and the battery module shown;

[0041] Figure 7 A schematic diagram showing the internal structure of a box shell of a battery pack provided by an embodiment of the present disclosure is shown;

[0042] Figure 8 Show Figure 7 Enlarged view of part A in the middle;

[0043] Fig. 9 A diagram showing a state in which a front crossbeam of a module of a battery pack provided by an embodiment of the present disclosure is installed in an assembly hole group;

[0044] Fig.10 A diagram showing a state in which a front cross beam of a module of a battery pack provided by an embodiment of the present disclosure is installed in another assembly hole group;

[0045] Fig.11 A cross-sectional view showing a partial structure of a box shell of a battery pack provided by an embodiment of the present disclosure

[0046] In the figure: 1, battery module; 11, end plate; 2, module fixing frame; 211, straight strip; 2111, harness fixing hole; 212, extension plate; 2121, mounting hole; 2122, hollow part; 213, bending edge; 2131, beam fixing hole; 22, fixing part; 221, fixing sheet; 2211, connecting hole; 222, connecting sheet; 223, rib; 31, battery main shell; 311, bottom plate; 3111, assembly hole group; 3112, mounting beam; 3113, Through-hole rivet nut; 312, second side panel; 3121, convex strip; 32, first side panel; 4, module fixing beam; 41, module rear beam; 42, module front beam; 421, bottom wall; 422, top wall; 423, inclined plate; 424, escape opening; 425, positioning groove; 5, BMS slave; 6, busbar; 61, aluminum bar group; 7, terminal seat; 8, sealing strip; 9, fastener; 91, screw; 92, cap body; a, first connecting piece; b, second connecting piece; c, steel belt.

[0047] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Embodiment 1

[0052] See also Figures 1 to 11 As shown, an embodiment of the present application provides a battery pack, comprising: a plurality of battery modules 1 and at least one module fixing frame 2. Each of the battery modules 1 is arranged in sequence, each of the battery modules 1 has an end plate 11, and the module fixing frame 2 comprises a main frame body and a plurality of fixing parts 22, the main frame body is located at the end of each of the battery modules 1 along the length direction, each of the fixing parts 22 is connected to the main frame body, and each of the fixing parts 22 extends to the end plate 11 of the corresponding battery module 1, and is fixedly connected to the end plate 11.

[0053] The various fixing parts 22 on the module fixing frame 2 in the battery pack of the present application can be fixedly connected to the end plates 11 of each battery module 1 in the battery pack, thereby integrating and fixing each composite module (including multiple battery modules), improving the overall anti-destruction ability of the composite module, enhancing the stability of the entire composite module, and facilitating the safe design of the battery system.

[0054] In some possible implementation schemes, each of the fixing portions 22 is respectively covered on the thickness end surface of the corresponding end plate 11, and a connecting hole 2211 is provided on the fixing portion 22. A connecting piece can be passed through the connecting hole 2211 and the end plate 11 to connect and fix the fixing portion 22 and the end plate 11.

[0055] The battery pack includes a box shell and a module fixing beam 4 arranged on the box shell, a longitudinal through hole is arranged on the end plate 11, and the connecting piece includes a rod body and a cap body arranged at one end of the rod body. The rod body passes through the connecting hole 2211 and the longitudinal through hole and is connected to the module fixing beam 4, and the cap body 92 is limited to the fixing part 22.

[0056] Each end plate 11 of the battery module 1 is provided with a longitudinal through hole on both sides, and the end plate 11 has two large faces arranged in sequence along the thickness direction and a thickness end face connecting the two large faces. The fixing portion 22 covers the thickness end face of the end plate 11 of the battery module 1, and the main frame can be attached to the large face of the end plate 11 of the battery module 1. One end of the connecting member passes through the connecting hole 2211 on the fixing portion 22 and the longitudinal through hole of the end plate 11 in sequence and is connected to the module fixing beam 4 on the shell of the battery pack. The other end of the connecting member is limited to the fixing portion 22. The connecting member can be a bolt. While connecting the end plate 11 of the battery module 1 and the fixing portion 22, the connecting member also fixes the end plate 11 of the battery module 1 on the shell of the battery pack, which simplifies the assembly structure, makes the installation of the battery module 1 easier, improves the assembly efficiency, and provides great convenience for the subsequent maintenance work.

[0057] In some possible embodiments, the main frame includes a straight strip 211, which is located at one end of each battery module 1 and extends along the arrangement direction of each battery module 1. Each fixing portion 22 is arranged on the straight strip 211, and each fixing portion 22 is arranged in sequence at intervals along the length direction of the straight strip 211 to extend to the corresponding end plate 11 respectively.

[0058] In some possible implementations, the main frame is a sheet-shaped body, and the fixing part 22 includes a fixing sheet 221 and a connecting sheet 222. The fixing sheet 221 is perpendicular to the main frame, and the connecting sheet 222 can be located in the same plane as the main frame. The fixing sheet 221 is provided with the end plate 11 connecting hole 2211, and the connecting sheet 222 connects the fixing sheet 221 and the main frame respectively. The main frame can be located on one side of the outer surface of the end plate 11 of each battery module 1, and can even be attached to each end plate 11 of the battery module 1.

[0059] Among the fixing parts 22, the fixing parts 22 located at the two ends are respectively connected to the end plates 11 of the two battery modules 1 at the two ends, and the fixing parts 22 located in the middle respectively cover the gap between the end plates 11 of two adjacent battery modules 1, and the fixing parts 22 located in the middle are respectively connected to the two adjacent end plates 11.

[0060] In some possible implementations, along the length direction of the straight strip 211, only one connection hole 2211 is provided on the fixing portions 22 at both ends, and two connection holes 2211 are provided on each fixing portion 22 at the middle. The fixing portions 22 at both ends are connected and matched with the longitudinal through holes on the outer sides of the end plates 11 at both ends, and each fixing portion 22 at the middle is provided with two connection holes 2211, so as to be connected to two adjacent end plates 11 through connecting pieces respectively.

[0061] In some possible implementations, see Figure 3 As shown, the battery pack includes two module fixing frames 2 , which are respectively arranged at both ends of the battery module 1 along the length direction, and each module fixing frame 2 is respectively connected to each end plate 11 on the corresponding side of each battery module 1 .

[0062] By arranging the module fixing frames 2 at both ends of the composite module (including multiple battery modules 1), the end plates 11 at the same end of the composite module can be conveniently connected to form a whole, making the entire composite module more integrated.

[0063] In some possible embodiments, the battery pack includes a BMS slave 5 , and a main frame of the module fixing frame 2 has an extension plate 212 , the extension plate 212 is connected to one side of the straight strip 211 along the width direction, and the BMS slave 5 is connected to the extension plate 212 .

[0064] In this embodiment, the extension plate 212 is provided with a mounting hole 2121, and the mounting hole 2121 is used to connect the BMS slave 5. The extension plate 212 has a large area and can be used to fix the BMS slave 5. The module fixing frame 2 can be combined with the BMS slave and fixed together, reducing the waste of space, while avoiding the contact between the BMS slave and the battery module 1, thereby improving safety.

[0065] Optionally, in some possible implementations, a hollow portion 2122 is provided on the extension plate 212, and when the BMS slave 5 is connected to the extension plate 212, the BMS slave 5 can cover the hollow portion 2122. The hollow portion 2122 has a weight-reducing effect and is conducive to lightweight design.

[0066] In some possible implementations, see Figure 1 As shown, a beam fixing hole 2131 is provided on the side of the main frame away from the fixing portion 22, and the beam fixing hole 2131 is used to connect and fix with the module mounting beam 3112 on the box shell of the battery pack. A module fixing beam 4 is usually provided on the bottom plate 311 (usually a water-cooled plate) of the shell of the battery pack, which is used to connect with the end plate 11 of the battery module 1. In the embodiment of the present application, the module fixing frame 2 is also fixed to the module fixing beam 4, so that the shell of the battery pack and each battery module 1 are connected and fixed to form an integral structure.

[0067] In some possible implementations, a bent edge 213 is provided on the side of the extension plate 212 facing away from the straight strip plate 211, and the bent edge 213 is used to connect and fix with the box shell of the battery pack. For example, the bent edge 213 is connected with the module fixing beam 4 in the box shell of the battery pack. The bent edge 213 may be provided with a beam fixing hole 2131 for matching with a fastener to connect with the module fixing beam 4.

[0068] The bent edge 213 can be directly attached to the module fixing beam 4 , one end of the fastener passes through the beam fixing hole 2131 of the bent edge 213 and is connected to the module fixing beam 4 , and the other end of the fastener is limited to the bent edge 213 .

[0069] In some possible implementations, see Figure 1 As shown, the battery pack includes a busbar 6 and a terminal seat 7, the busbar 6 covers each of the battery modules 1, an aluminum bar group 61 is arranged on the busbar 6, the aluminum bar group 61 is connected to the battery cells of each of the battery modules 1, the extension plate 212 is located on one side of the straight strip 211 along the length direction, the terminal seat 7 is located on the other side of the straight strip 211 along the length direction, and the terminal seat 7 is electrically connected to the aluminum bar group 61. The terminal seat 7 is connected with an electrical copper busbar for transmitting the current of the battery module 1. The present application avoids the terminal seat 7 by arranging the extension plate 212 at one end of the straight strip 211 along the length direction, and does not interfere with the wiring of the electrical copper busbar.

[0070] The peripheral edge of the main frame is bent toward the end plate 11, so that the edge of the main frame away from the end plate 11 is a smoothly transitioned arc surface without abrupt edges and corners, thereby avoiding cutting the wiring harness and copper busbar. For example, the two side edges of the straight strip 211 along the width direction, the two side edges of the connecting piece 222, and the peripheral edge of the extension plate 212 are all configured to be bent toward the end plate 11.

[0071] The module fixing frame 2 provided in the embodiment of the present application can ensure that the forces on each battery module 1 are balanced, and adjacent battery modules 1 are not prone to relative movement. There is no need to cover the outside of the composite module with a large steel belt c, and the battery cells of the battery module 1 are not prone to uneven forces, which greatly improves the structural stability of the composite module and the quality of the battery pack.

[0072] In some possible implementations, a plurality of harness fixing holes 2111 are provided on the flat strip 211, and the harness fixing holes 2111 are arranged in sequence and at intervals along the length direction of the flat strip 211. In view of the current situation where there are many harnesses distributed in the battery pack and no installation points, the embodiment of the present application, in combination with the characteristics of the module fixing frame 2, reserves harness fixing holes 2111 on the flat strip 211 of the module fixing frame 2 to fix the harnesses in the battery pack, so that the harnesses in the battery pack are regular, and the problem of failure caused by disordered disconnection of the harnesses during operation is reduced, which affects the normal operation of the battery pack.

[0073] The battery pack can be equipped with multiple wire fixers, which form loops and can be put on multiple cables to fix the cables. A plug-in portion can be provided on the wire fixer, which can be plugged and fixed to the wire harness fixing hole 2111 on the straight strip 211.

[0074] In some possible implementations, see Figures 4 to 6 As shown, the fixing portion 22 located in the middle position (not the fixing portions 22 at both ends) generally includes a fixing sheet portion 221, a connecting sheet portion 222 and a partition rib 223. The connecting sheet portion 222 is vertically connected to the fixing sheet portion 221, and the connecting sheet portion 222 is located on a length edge of the fixing sheet portion 221, and a step groove is formed between the fixing sheet portion 221 and the connecting sheet portion 222. The partition rib 223 is located in the step groove, and the partition rib 223 is located in the middle of the fixing sheet portion 221 along the length direction, and the partition rib 223 is respectively connected to the fixing sheet portion 221 and the connecting sheet portion 222. Wherein, the fixing sheet portion 221 and / or the connecting sheet portion 222 are provided with a connecting hole 2211 for connection and fixation.

[0075] The fixing part 22 located in the middle is used to connect the end plates 11 of two adjacent battery modules 1 in the composite module. The fixing sheet 221 covers the thickness end surface of the end plates 11 of the two adjacent battery modules 1. The connecting sheet 222 is limited to the large surface of the end plates 11 of the two adjacent battery modules 1. The large surface is the side surface on both sides of the end plate 11 along the thickness direction, that is, the side of the end plate 11 away from the battery module 1. The partition rib 223 is located between the two adjacent battery modules 1. The fixing part 22 fixes each battery module 1 to each other, reduces the impact of the shaking of the battery pack on the battery module 1 during use, improves the stability of the entire composite module, and is conducive to the safety design of the battery system.

[0076] The width of the connecting piece 222 of the fixing part 22 located in the middle is smaller than that of the fixing piece 221. Two connecting holes 2211 are arranged on the fixing piece 221, and the two connecting holes 2211 are arranged on both sides of the partition 223. The width of the fixing piece 221 is roughly the same as the thickness of the end plate 11 or slightly smaller than the thickness of the end plate 11. The fixing piece 221 will not protrude the thickness end surface of the end plate 11 to one side of the battery module 1, and the position of the fixing piece 221 will not interfere with the internal structural setting of the battery module 1. The connecting piece portion 222 is limited to the large surface of the end plate 11 away from the battery cells. The size of the connecting piece portion 222 does not need to be too large, and it only needs to have the function of limiting the battery module 12, so that the fixing portion 22 of the module fixing frame 2 of the present application can reduce the structural size, weight, consumables, and cost, and will not interfere with the setting of the steel belt c on each battery module 1 (each battery cell on each battery module 1 is bound by the same steel belt c).

[0077] The partition rib 223 may extend along the width direction of the fixed sheet 221, one end of the partition rib 223 along the length direction is connected to the connecting sheet 222, and one length side of the partition rib 223 is connected to the fixed sheet 221. The partition rib 223 is connected along one end and two directions of one length side in the length direction, and the partition rib 223 is integrally formed with the fixed sheet 221 and the connecting sheet 222, and has good structural stability. The partition rib 223 can be connected to the fixed sheet 221 and the connecting sheet 222 by welding.

[0078] like Figure 5 As shown, the side of the partition rib 223 away from the fixing sheet 221 is provided with a narrowing edge. In the direction from the fixing sheet 221 to the narrowing edge, the width of the narrowing edge gradually decreases. The width of the narrowing edge is smaller than the gap between the end plates 11 of two adjacent battery modules 1. When assembling the module fixing frame 2 of the present application, the narrowing edge of the partition rib 223 can smoothly penetrate into the gap.

[0079] In a possible implementation, a smooth outer surface is provided on the side of the rib 223 away from the fixing sheet 221. The side of the rib 223 away from the fixing sheet 221 has no sharp structure, and will not be scratched with the end plate 11 of the battery module 1, leaving no scratch marks, and causing damage to the end plate 11.

[0080] like Figure 6 As shown, each of the battery modules 1 is sleeved with a steel belt c. In the prior art, the same steel belt c is sleeved on the periphery of all the battery modules 1 of the composite module, but this causes the composite module to be subjected to a greater extrusion force toward the inside, resulting in uneven force on each battery cell inside the battery module 1. The composite module of the present application is sleeved with a small steel belt c on each of the battery modules 1, which reduces or eliminates the extrusion force between the battery modules 1, and the battery modules 1 are not easy to move relative to each other. The partition rib 223 extends between the end plates 11 of two adjacent battery modules 1, and the partition rib 223 and the steel belt c are offset. The partition rib 223 does not extend to the position of the steel belt c, and the partition rib 223 and the steel belt c are offset, and the partition rib 223 and the steel belt c do not interfere with each other.

[0081] The fixing plate portion 221 of the module fixing frame 2 of the present application covers the thickness end surface of the end plate 11 of two adjacent battery modules 1, the connecting plate portion 222 is limited to the large surface of the end plate 11 of two adjacent battery modules 1, and the partition rib 223 is located between two adjacent battery modules 1, thereby achieving the limitation of the battery module 1 in three directions, avoiding the uneven force caused by using the same steel belt c for multiple battery modules 1, improving the integrity and stability of the entire composite module, and facilitating the safe design of the battery system.

[0082] See also Figure 3 As shown, the composite module can be equipped with two module fixing frames 2 of the present application, and the two module fixing frames 2 are respectively arranged at the two ends of the composite module, and are used to fix and connect the end plates at the same end of the composite module. Among them, one module fixing frame 2 may not be provided with an extension plate 212.

[0083] Embodiment 2

[0084] See also Figures 7 to 10 As shown, the embodiment of the present application further describes the battery pack in detail, which includes: a box shell, a module rear crossbeam 41 and a module front crossbeam 42. The box shell has a bottom plate 311, and at least two assembly hole groups 3111 are arranged on the bottom plate 311. Each assembly hole group 3111 is arranged in sequence along the length direction of the bottom plate 311. The module rear crossbeam 41 is connected to the bottom plate 311, and the module front crossbeam 42 is selectively connected to any assembly hole group 3111 to adjust the distance between the module front crossbeam 42 and the module rear crossbeam 41, wherein the module front crossbeam 42 and the module rear crossbeam 41 are both provided with end plate holes for connection and fixing, and the end plate holes are used to connect with the end plate 11 of the battery module 1.

[0085] The battery pack of the present application has multiple assembly hole groups 3111. When a long module needs to be matched and installed, refer to Fig. 9 As shown, the front cross beam 42 of the module can be moved to the front assembly hole group 3111 and connected to the corresponding assembly hole group 3111 by means of a connecting piece. When a corresponding matching short module group is required, refer to Fig.10 As shown, the front cross beam 42 of the module can be retracted to the corresponding assembly hole group 3111, and the module can be fixed with the help of connecting parts without other additional operations, which greatly reduces the manufacturing cost and working hours, enhances the flexibility of the production system, and improves production efficiency.

[0086] The battery pack of the present application provides a module front crossbeam 42 with adjustable position. This design allows the module front crossbeam 42 to be flexibly adjusted according to the actual position requirements of the module, so that the span between the two crossbeams can be adjusted, thereby ensuring that modules of different sizes installed on the crossbeam can be adapted to standard battery boxes, thereby eliminating the need to customize boxes for each module size, greatly reducing manufacturing costs and time, while enhancing the flexibility of the production system and improving production efficiency.

[0087] During the specific assembly of the battery module 1, the end plate 11 of the battery module 1 is supported on the module beam, and then the screw of the bolt passes through the end plate 11 and is connected to the end plate hole on the module front beam 42, and the cap of the bolt is limited to the top of the end plate.

[0088] In some possible implementation schemes, the assembly holes of each assembly hole group 3111 are arranged in sequence at intervals along the width direction of the base plate 311, and one end of each of the multiple connecting parts passes through the module front cross beam 42 and is connected to the corresponding assembly hole 2121, and the other end of the connecting part is limited on the module front cross beam 42. Each connecting part can be a bolt, and the assembly hole can be provided with an internal thread. The disassembly and assembly of the connecting parts is relatively convenient without increasing the workload of the workers too much.

[0089] In some possible implementations, see Figure 7 and Figure 8 As shown, the module front cross beam 42 has a bottom wall 421 and a top wall 422, the bottom wall 421 and the top wall 422 are connected, a hollow cavity is formed between the bottom wall 421 and the top wall 422, the bottom wall 421 is attached to the bottom plate 311, one end of a plurality of first connecting members a passes through the bottom wall 421 and is connected to the corresponding assembly holes on the bottom plate 311, the other end of the first connecting member a is limited to the bottom wall 421, one end of a plurality of second connecting members b passes through the top wall 422 and the bottom wall 421 in sequence and is connected to the corresponding assembly holes, the other end of the second connecting member b is limited to the top wall 422.

[0090] The top wall 422 is provided with a countersunk hole, the second connector b passes through the countersunk hole, the cap body of the second connector b is embedded in the countersunk hole, and the top surface of the cap body 92 is not higher than the top wall 422. The second connector b can be a countersunk screw, and its cap body 92 is embedded in the countersunk hole, does not protrude from the top wall, and does not interfere with the installation of the end plate 11 of the battery module 1.

[0091] See also Figure 7 and Figure 8 As shown, a clearance opening 424 is provided on the top wall 422, the clearance opening 424 is connected to the hollow cavity, and the cap body 92 of the first connecting member a is exposed to the clearance opening 424. During assembly, the end of the first connecting member a can first extend into the clearance opening 424, then pass through the bottom wall 421 and then be threadedly connected to the bottom plate 311 of the box shell. The cap body 92 of the first connecting member a can be accommodated in the hollow cavity, not exposed, and will not interfere with the installation of the battery module 1.

[0092] In some possible implementations, see Figure 7 and Figure 8 As shown, an inclined plate 423 is connected between the top wall 422 and the bottom wall 421, and the avoidance opening 424 partially extends to the inclined plate 423, thereby increasing the area of ​​the avoidance opening 424 and facilitating the assembly of the first connecting member a. The present application provides the inclined plate 423 so that one side of the module front cross beam 42 along the width direction is a wedge-shaped structure. Although the volume is reduced, the structural strength of the module front cross beam 42 is still guaranteed, while also saving materials, which is beneficial to reducing the weight of the battery box.

[0093] In some possible implementation schemes, the bottom plate 311 has a cooling water channel and a solid portion located between the cooling water channels. Each assembly hole of the assembly hole group 3111 is opened on the solid portion. The assembly holes are arranged away from the cooling water channels to avoid water leakage.

[0094] In some possible implementation schemes, a positioning groove 425 is provided on the module front crossbeam 42, and a plurality of mounting beams 3112 are provided on the bottom plate 311. When the module front crossbeam 42 is connected to the assembly hole group 3111 at one end away from the module rear crossbeam 41, the mounting beam 3112 extends to the positioning groove 425. The positioning cooperation between the mounting beam 3112 and the positioning groove 425 can assist in fixing the module front crossbeam 42 and enhance the stability of the fixed structure of the module front crossbeam 42.

[0095] In some possible implementations, the module rear cross beam 41 can be welded to the bottom plate 311 by laser welding. The bottom plate 311 can be a water-cooled plate with a cooling water channel inside. When assembling battery modules 1 of different sizes, it is only necessary to adjust the position of the module front cross beam 42.

[0096] In some possible implementation schemes, the module rear cross beam 41 and the module front cross beam 42 are both extruded aluminum alloy bars.

[0097] In the embodiment of the present application, the module rear cross beam 41 and the module front cross beam 42 are both formed by extrusion, the structure of the aluminum alloy is optimized, and the mechanical properties are significantly improved. In addition, the dimensional accuracy and surface quality of the cross beam formed by extrusion are very high, and it can be used directly as a finished product without or only a small amount of subsequent processing. Compared with other forming processes, the equipment investment of extrusion forming is small and the process flow is simple.

[0098] Embodiment 3

[0099] See also Fig.11 As shown, the embodiment of the present application provides a further detailed description of the battery pack, which has a box shell, including: a battery main shell, a sealing strip 8 and a cover body. A sealing matching groove is provided on the outer side wall of the battery main shell 31, and the sealing strip 8 is provided in the sealing matching groove. The cover body has a top plate and a first side plate 32 located at the edge of the top plate. When the cover body and the battery main shell are connected, the sealing strip 8 is compressed and arranged between the first side plate 32 and the battery main shell.

[0100] The present application sets a sealing matching groove on the outer wall of the battery casing. When the sealing strip 8 is placed in the sealing matching groove, the groove walls on both sides of the sealing matching groove along the width direction will be limited to both sides of the sealing strip 8. There is no need to apply glue between the outer wall and the sealing strip, which simplifies the assembly process, improves assembly efficiency, and the sealing structure has high stability and good durability.

[0101] In some possible embodiments, two ridges 3121 are provided on the outer wall of the battery main shell, the sealing fitting groove is formed between the two ridges 3121 , the sealing strip 8 is located between the two ridges 3121 , and the first side panel 32 is attached to the two ridges 3121 .

[0102] The two ridges 3121 are limited on both sides of the sealing strip 8 along the width direction. When the battery main shell and the cover body are connected, the sealing strip 8 is compressed and deformed. Because of the setting of the two ridges 3121, the maximum deformation of the sealing strip 8 is limited, and the ridges 3121 limit the position of the sealing strip 8 to prevent the sealing strip 8 from being seriously displaced and affecting the sealing effect.

[0103] In some possible implementations, a smooth convex arc surface is provided at one end of the convex strip 3121 away from the first side plate 32. The structure is simple, and the friction between the convex strip 3121 and the cover body is reduced, thereby extending the service life. Compared with the convex strip 3121 with a straight top, the convex strip 3121 with an arc-shaped top is simpler and easier to produce. For example, the battery main shell is an extruded integral part, and the battery main shell adopts an extrusion molding process, which is more suitable for producing structural parts with a surface arc transition.

[0104] In some possible implementations, when the battery main shell and the cover body are separated, the thickness of the sealing strip 8 is greater than the width of the ridge 3121, so that when the battery main shell and the cover body are connected, the sealing strip 8 can easily contact the inner wall of the cover body. The width of the sealing strip 8 is smaller than the width of the sealing fitting groove. When the battery main shell and the cover body are connected, the sealing strip 8 is respectively attached to the first side plate 32 and the battery main shell on both sides along the thickness direction. When the sealing strip 8 is squeezed by the cover body, the width will increase, but the width will not be greater than the spacing between the two ridges 3121. The sealing strip 8 will not break away from the space between the two ridges 3121. Combined with the inherent adhesion characteristics of the sealing strip 8, the sealing strip 8 can effectively seal the gap between the battery main shell and the cover body for a long time. The present application realizes the removal of glue and gasket fixation, which greatly improves the stability and assembly efficiency.

[0105] In some possible implementations, the battery main case has a bottom plate 311 and a second side plate 312, the second side plate 312 is connected to the bottom plate 311, and the sealing groove is provided on the second side plate 312. At least one of the two ridges 3121 is located on the second side plate 312. When the cover is attached to the battery main case, the first side plate 32 of the cover will naturally cover the two ridges 3121.

[0106] In some possible implementations, the battery pack case includes a fastener 9 , one end of the fastener 9 passes through the first side plate 32 and is connected to the bottom plate 311 , and the other end of the fastener 9 is limited to the first side plate 32 .

[0107] A cavity is formed between the bottom plate 311 and the cover body for setting the battery module 1. The fastener 9 is connected to the bottom plate 311, which corresponds to the lower side of the battery pack, rather than the front side of the traditional battery pack. Therefore, the fastener 9 will not penetrate into the cavity and will not affect the sealing of the battery pack. It should be noted that the fastener 9 is located on the bottom side of the two convex strips 3121, that is, below the sealing position of the battery main shell and the cover body, and will not affect the sealing structure.

[0108] In some possible embodiments, a through hole rivet nut 3113 is provided on the base plate 311, and the fastener 9 includes a screw rod 91 and a cap body 92 connected to the screw rod 91, the screw rod 91 passes through the first side plate 32 and is threadedly connected to the through hole rivet nut 3113, and the cap body 92 is limited to the outer surface of the first side plate 32.

[0109] Because the fastener 9 is connected to the bottom plate 311 and will not penetrate the cavity of the battery pack, the traditional more expensive blind hole rivet nut can be replaced with a cheaper through hole rivet nut, further saving costs and reducing the weight of the battery pack.

[0110] In some possible implementation schemes, a cooling water channel is provided in the bottom plate 311 . Liquid flows into the cooling water channel to exchange heat with the battery module 1 , thereby reducing the temperature of the battery module 1 .

[0111] The present application also provides a battery pack, including: a battery module 1 and the above-mentioned battery pack case, a cavity is formed between the battery main shell and the cover body, and the battery module 1 is arranged in the cavity.

[0112] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A battery pack, characterized in that: include: A plurality of battery modules, each of which is arranged in sequence, and each of which has an end plate; The module fixing frame includes a main frame body and a plurality of fixing parts. The main frame body is located at the end of each battery module along the length direction. Each fixing part is connected to the main frame body. Each fixing part extends to the end plate of the corresponding battery module and is fixedly connected to the end plate.

2. The battery pack according to claim 1, characterized in that: Each of the fixing parts is covered on the thickness end surface of the corresponding end plate, and a connecting hole is provided on the fixing part; The connecting piece can be inserted through the connecting hole and the end plate to connect and fix the fixing part and the end plate.

3. The battery pack according to claim 2, characterized in that: The battery pack includes a box shell and a module fixing beam arranged on the box shell; The end plate is provided with a longitudinal through hole; The connecting member comprises a rod body and a cap body arranged at one end of the rod body; The rod body passes through the connecting hole and the longitudinal through hole and is connected to the module fixing beam, and the cap body is limited to the fixing part.

4. The battery pack according to claim 1, characterized in that: The main frame includes a flat strip; The straight strip is located at one end of each of the battery modules, and the straight strip extends along the arrangement direction of each of the battery modules. Each of the fixing parts is arranged on the straight strip, and each of the fixing parts is arranged in sequence and spaced apart along the length direction of the straight strip to extend to the corresponding end plates respectively.

5. The battery pack according to claim 4, characterized in that: Among the fixing parts, the fixing parts located at both ends are respectively connected to the end plates of the two battery modules at both ends, the fixing parts located in the middle respectively cover the gap between the end plates of two adjacent battery modules, and the fixing parts located in the middle respectively connect the two adjacent end plates.

6. The battery pack according to claim 4, characterized in that: It includes two module fixing frames; The two module fixing frames are respectively arranged at two ends of the battery module along the length direction; Each of the module fixing frames is respectively connected to each end plate on a corresponding side of each battery module.

7. The battery pack according to claim 6, characterized in that: Including BMS slave; A main frame of the module fixing frame has an extension plate, and the extension plate is connected to one side of the straight strip along the width direction; The BMS slave is connected to the extension board.

8. The battery pack according to claim 7, characterized in that: A bent edge is provided on one side of the extension plate facing away from the straight strip plate; The bent edge is used to be connected and fixed to the box shell of the battery pack.

9. The battery pack according to claim 7, characterized in that: Includes busbar and terminal block; The busbar is covered on each of the battery modules, and an aluminum bar group is arranged on the busbar, and the aluminum bar group is connected to the battery cells of each of the battery modules; The extension plate is located on one side of the straight strip along the length direction; The terminal seat is located on the other side of the straight strip along the length direction, and the terminal seat is electrically connected to the aluminum bar group.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The peripheral side edge of the main frame is bent toward one side of the end plate, so that the edge of the main frame facing away from the end plate is a smoothly transitioned arc surface.

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