Air-cooled battery pack for energy storage

Abstract

The invention discloses an air-cooled battery pack for energy storage. The air-cooled battery pack comprises a box shell, a battery cell group and a wiring copper bar, the box shell is provided with a bottom plate, a front end shell, a rear end shell and a connector, the front end shell and the rear end shell are both connected to the bottom plate, the front end shell is provided with a first cavity, a second cavity is formed between the front end shell and the bottom plate, the front end shell is provided with a receding opening communicated with the first cavity and the second cavity, and the connector is arranged in the receding opening. The connector is arranged on the front end shell, a battery cavity is formed among the bottom plate, the front end shell and the rear end shell, the battery cell set is arranged in the battery cavity, at least part of the wiring copper bar is located in the first cavity, the two ends of the wiring copper bar are electrically connected with the battery cell set and the connector respectively, and the receding opening is located in the extending path of the wiring copper bar. And the wiring copper bar partially extends to the avoiding opening. The avoiding opening is formed in the battery pack, so that a wiring space is reserved for the wiring copper bar, the copper bar can avoid some structures in the front end shell conveniently, and arrangement of the copper bar is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to an air-cooled battery pack for energy storage. Background Art

[0002] At present, with the continuous development of the new energy industry and the transformation of the global energy structure, energy storage technology has become the key to solving the current energy storage and utilization. Most of the existing energy storage systems are composed of several battery packs and other components. The battery pack usually includes a box shell and a battery cell group arranged in the box shell. The box shell has a front shell and a rear shell. A connector is arranged on the front shell, and the connector is connected to the internal battery cell group through a copper busbar. The front shell usually has a cavity, and the copper busbar is at least partially located in the cavity and extends along the cavity. However, the cavity space of the front shell is small, which is not conducive to the bending, bending and extension of the copper busbar in the cavity. In order to realize the extension of the copper busbar from the battery cell group to the connector, the copper busbar inevitably needs to bend and turn to avoid the side structure inside the front shell. The small space makes it difficult to route the copper busbar, which increases the difficulty of assembly. Summary of the invention

[0003] In order to solve one of the above technical problems, the present invention provides an air-cooled battery pack for energy storage.

[0004] The present invention adopts the following technical solutions:

[0005] The embodiment of the present application provides an air-cooled battery pack for energy storage, comprising:

[0006] A box shell, the box shell having a bottom plate, a front end shell, a rear end shell and a connector, the front end shell and the rear end shell are both connected to the bottom plate, the front end shell has a first cavity, a second cavity is formed between the front end shell and the bottom plate, a avoidance port connecting the first cavity and the second cavity is provided on the front end shell, the connector is provided on the front end shell, and a battery cavity is formed between the bottom plate, the front end shell and the rear end shell;

[0007] A battery cell group, the battery cell group is arranged in the battery cavity;

[0008] A wiring copper bar, wherein the wiring copper bar is at least partially located in the first cavity, two ends of the wiring copper bar are electrically connected to the battery cell group and the connector respectively, the avoidance is located on the extension path of the wiring copper bar, and the wiring copper bar partially extends to the avoidance.

[0009] Optionally, the wiring copper busbar has a bending and turning portion, and at least the bending and turning portion extends into the avoidance opening.

[0010] Optionally, the avoidance opening is a long strip opening extending along the width direction of the box shell, and a partial structural section of the wiring copper busbar extends along the long strip opening.

[0011] Optionally, the front end shell includes an inner bracket, an outer panel and a bottom bracket;

[0012] The bottom bracket is fixedly connected to the bottom plate, the second cavity is formed between the bottom bracket and the bottom plate, and the avoidance opening is arranged on the bottom bracket;

[0013] The inner bracket and the outer panel are respectively arranged on both sides of the bottom bracket, and the first cavity is formed between the bottom bracket, the inner bracket and the outer panel;

[0014] The connector is arranged on the outer panel.

[0015] Optionally, the bottom plate comprises a bottom plate body and a first flange located at one end of the bottom plate body along the length direction;

[0016] The bottom bracket includes a flat plate and second flanges located on both sides of the flat plate, and the two second flanges extend to both sides of the flat plate in the thickness direction respectively;

[0017] One of the second flanges is connected to the first flange, and another of the second flanges is connected to the bottom plate body. The second cavity is formed between the flat plate and the bottom plate, and the avoidance opening is arranged on the flat plate.

[0018] Optionally, the front end shell has a plurality of support frames, the support frames are located between the inner bracket and the outer panel, the support frames are fixedly connected to the inner bracket, and the outer panel is fixed to the support frames by fasteners, and part of the support frames are fixedly connected to the bottom bracket.

[0019] Optionally, the support frame includes a middle support frame and two side support frames, the two side support frames are fixedly connected to the bottom bracket, and the side support frames are respectively connected to the inner bracket and the outer panel;

[0020] The middle support frame is located between the two side support frames, and the two sides of the middle support frame along the thickness direction of the outer panel are respectively connected to the inner bracket and the outer panel by fasteners;

[0021] A limiting piece is arranged on the middle supporting frame, and a collection harness connecting the battery cell group is limitedly matched with the limiting piece.

[0022] Optionally, the battery pack includes an air duct, and the air duct includes an air duct frame and two air duct plates;

[0023] The air duct frame is arranged in the box shell, and the air duct frame has an air duct cavity and two side openings connected to the air duct cavity, and the two side openings are arranged on both sides of the air duct frame along the thickness direction;

[0024] The air duct plate is connected to the air duct frame, and the two air duct plates cover two side openings respectively, and the air duct plate is provided with an air port connected to the air duct cavity;

[0025] The battery cell components of the battery pack are arranged on both sides of the air duct along the thickness direction.

[0026] Optionally, the battery pack housing includes a side reinforcing beam, and the side reinforcing beam includes a first horizontal plate and a first vertical plate;

[0027] The bottom plate comprises a bottom plate body and third flanges located on both sides of the bottom plate body along the width direction;

[0028] The first horizontal plate is connected to the bottom plate body, and the first vertical plate is connected to the third flange;

[0029] The side reinforcement beam is located at the outer side of the battery cell group.

[0030] Optionally, the side reinforcing beam has an inner support structure, and the inner support structure includes a second vertical plate and a second horizontal plate.

[0031] The second vertical plate and the second horizontal plate are smoothly connected, and the first horizontal plate is connected to the second vertical plate.

[0032] The first vertical plate is connected to the second horizontal plate;

[0033] The second vertical plate is attached to one side of the battery cell group along the width direction.

[0034] By adopting the above technical solution, the present application has the following beneficial effects:

[0035] In the present application, a avoidance opening is provided in the battery pack, thereby reserving space for wiring copper busbars and facilitating the arrangement of the copper busbars.

[0036] 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

[0037] 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:

[0038] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application is shown;

[0039] Figure 2A partial structural schematic diagram showing an outer panel of a battery pack provided by an embodiment of the present application in a separated state;

[0040] Figure 3 A partial structural schematic diagram of a battery pack provided in an embodiment of the present application is shown;

[0041] Figure 4 A schematic diagram of the matching structure of the bottom plate and the bottom bracket of the battery pack provided in an embodiment of the present application is shown;

[0042] Figure 5 A schematic diagram showing the structure of a box shell of a battery pack provided in an embodiment of the present application is shown;

[0043] Figure 6 A partial structural schematic diagram of a battery pack case provided in an embodiment of the present application is shown;

[0044] Figure 7 A schematic diagram of the coordination structure of a battery cell group and an air duct in a battery pack provided in an embodiment of the present application is shown;

[0045] Figure 8 A schematic diagram of the matching structure of the bottom plate and the side reinforcement beam in the battery pack provided in an embodiment of the present application is shown;

[0046] Fig. 9 A schematic diagram showing the arrangement of a conductive aluminum row of a battery pack provided in an embodiment of the present application is shown;

[0047] Fig.10 A schematic diagram showing the matching structure of a battery cell group and a rear end shell of a battery pack provided in an embodiment of the present application is shown;

[0048] Fig.11 A schematic structural diagram of a battery cell group of a battery pack provided in an embodiment of the present application is shown.

[0049] In the figure: 1, bottom plate; 11, bottom plate body; 12, first flange; 13, third flange; 2, front shell; 21, inner bracket; 211, hanging ear; 22, outer panel; 23, bottom bracket; 231, flat plate; 2311, avoidance; 232, second flange; 24, middle support frame; 25, side support frame; 26, fan; 27, BMU; 3, rear shell; 31, reinforcing rib; 4, battery cell group; 41, battery cell monomer; 42, heat sink; 43, insulation sheet; 5, connector; 51, Positive connector; 52, negative connector; 6, wiring copper busbar; 61, bending and turning part; 7, air duct; 71, air duct frame; 711, side opening; 72, air duct plate; 721, air outlet; 8, side reinforcement beam; 81, first horizontal plate; 82, first vertical plate; 83, second vertical plate; 84, second horizontal plate; 9, reinforced side plate; 10, crossbeam; 100, integrated busbar; 101, blister bracket; 102, aluminum busbar; 103, output pole conductive aluminum busbar; 200, collection harness; 300, upper cover.

[0050] 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

[0051] 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.

[0052] 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.

[0053] 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.

[0054] See also Figures 1 to 11As shown, an embodiment of the present application provides an air-cooled battery pack for energy storage, including: a box shell, a battery cell group 4 and a wiring copper bar 6. The box shell has a bottom plate 1, a front shell 2, a rear shell 3 and a connector 5, the front shell 2 and the rear shell 3 are both connected to the bottom plate 1, the front shell 2 has a first cavity, a second cavity is formed between the front shell 2 and the bottom plate 1, and a avoidance opening 2311 connecting the first cavity and the second cavity is provided on the front shell 2, the connector 5 is provided on the front shell 2, a battery cavity is formed between the bottom plate 1, the front shell 2 and the rear shell 3, the battery cell group 4 is provided in the battery cavity, the wiring copper bar 6 is at least partially located in the first cavity, and the two ends of the wiring copper bar 6 are electrically connected to the battery cell group 4 and the connector 5 respectively, the avoidance opening 2311 is located on the extension path of the wiring copper bar 6, and the wiring copper bar 6 partially extends to the avoidance opening 2311. If the first cavity and the second cavity are isolated and the avoidance opening 2311 is not provided, the space inside the first cavity is relatively small, and it is difficult to arrange the wiring copper busbar 6. The front end shell 2 of the battery pack of the present application increases the wiring space of the wiring copper busbar 6 by providing the avoidance opening 2311, which facilitates the arrangement of the wiring copper busbar and facilitates the wiring copper busbar 6 to avoid some structures inside the front end shell 2.

[0055] For example, a fan 26 is installed in the upper middle part of the front end shell 2, and the path of the wiring copper bus 6 extending from the battery cell group 4 to the connector 5 needs to avoid the fan 26, thereby making the space for arranging the wiring copper bus 6 in the first cavity smaller. By setting an avoidance opening 2311 at the bottom of the first cavity, space for arranging the wiring copper bus 6 is provided, thereby solving the problem of small space and difficult wiring in the front end shell 2.

[0056] In some possible implementations, see Figure 3 As shown, the wiring copper bar 6 has a bending and turning portion 61, and at least the bending and turning portion 61 extends into the avoidance opening 2311. A crease is formed at the bending and turning portion of the wiring copper bar 6, and the structures on both sides of the crease fit each other, and the thickness and hardness are large. When it contacts and collides with other structures, it is easy to break and be damaged. In order to solve this problem, in the present application, the bending and turning portion 61 can extend from the avoidance opening 2311 to the second cavity, and the bending and turning portion 61 is in a suspended state, which avoids the bending and turning portion 61 from contacting with other structures inside the front end shell 2, resulting in severe wear or even damage.

[0057] In some possible implementations, see Figure 3 and Figure 4 As shown, the avoidance opening 2311 is a long strip opening extending along the width direction of the box shell, and a partial structural section of the wiring copper bus 6 extends along the long strip opening.

[0058] The avoidance opening 2311 is a long strip opening, and a long section of the wiring copper bar 6 can be arranged, which facilitates the arrangement of the wiring copper bar 6. The wiring copper bar 6 can be located in the second cavity and extend along the avoidance opening 2311. The wiring copper bar 6 can also be located in the first cavity and the second cavity respectively on both sides of the width direction of the partial structural section, and extend along the avoidance opening 2311. Both ends of the section of the wiring copper bar 6 extending along the avoidance opening 2311 are bending turning parts 61, and the two bending turning parts 61 and the structural section between the two bending turning parts 61 are located in the second cavity, or located on the avoidance opening 2311. Or the wiring copper bar section located between the two bending turning parts 61 is a trapezoid, the small end of the trapezoid extends to the avoidance opening 2311, and the large end is located in the first cavity. Both of the two bending turning parts 61 have a spacing with the two ends of the avoidance opening 2311, and do not contact the physical structure of the front end shell 2, and the two bending turning parts 61 are not easy to wear or break.

[0059] In some possible implementations, see Figure 2 As shown, the front end shell 2 includes an inner bracket 21, an outer panel 22 and a bottom bracket 23. The bottom bracket 23 is fixedly connected to the bottom plate 1. The second cavity is formed between the bottom bracket 23 and the bottom plate 1. The avoidance opening 2311 is provided on the bottom bracket 23. The inner bracket 21 and the outer panel 22 are respectively provided on both sides of the bottom bracket 23. The inner bracket 21 and the outer panel 22 can be connected to the bottom bracket 23 or the bottom plate 1. The first cavity is formed between the bottom bracket 23, the inner bracket 21 and the outer panel 22. The connector 5 is provided on the outer panel 22. The connector 5 partially extends into the first cavity to connect with the wiring copper bus 6 in the first cavity.

[0060] In some possible implementations, see Figures 1 to 4 As shown, the bottom plate 1 has a bottom plate body 11 and a first flange 12 located at one end of the bottom plate body 11 along the length direction, the bottom bracket 23 includes a flat plate 231 and second flanges 232 located on both sides of the flat plate 231, the two second flanges 232 extend to both sides of the flat plate 231 along the thickness direction, the cross section of the bottom bracket 23 can be a "Z" shape, one of the second flanges 232 is attached to the first flange 12, the other second flange 232 is attached to the bottom plate body 11, the second cavity is formed between the flat plate 231 and the bottom plate 1, and the avoidance opening 2311 is provided on the flat plate 231. The inner bracket 21 can be attached to a second flange 232 of the bottom bracket 23.

[0061] In some possible implementations, the front end shell 2 has a plurality of support frames, the support frames are located between the inner bracket 21 and the outer panel 22, the support frames are fixedly connected to the inner bracket 21, and the outer panel 22 is fixed to the support frames by fasteners, and part of the support frames are fixedly connected to the bottom bracket 23, such as being fixed to the flat plate 231 of the bottom bracket 23. The setting of the support frame has the function of connecting the inner bracket 21 and the outer panel 22, and at the same time has the function of assisting in forming the first cavity, and the support frame also has the function of enhancing the structural strength of the front end shell 2.

[0062] In some possible implementations, see Figure 2 and Figure 3 As shown, the support frame includes a middle support frame 24 and two side support frames 25, the two side support frames 25 are fixedly connected to the bottom bracket 23, and the side support frames 25 are respectively connected to the inner bracket 21 and the outer panel 22, the middle support frame 24 is located between the two side support frames 25, and the two sides of the middle support frame 24 along the thickness direction of the outer panel 22 are respectively connected to the inner bracket 21 and the outer panel 22 by fasteners, and a limiting piece is provided on the middle support frame 24, and the collection harness 200 connected to the battery cell group 4 is limitedly matched with the limiting piece. A through hole can be provided on the top plate of the middle support frame 24, and the elastic head of the limiting piece can be connected to the through hole. The limiting piece has a ring body, and the collection harness can be set through the ring body. The ring body has a limiting effect on the collection harness, and the end of the collection harness is connected to the BMU27 set on the outer panel 22.

[0063] In some possible implementations, see Figures 5 to 7As shown, the battery pack includes an air duct 7, the air duct 7 includes an air duct frame 71 and two air duct plates 72, the air duct frame 71 is arranged in the box shell, the air duct frame 71 has an air duct cavity and two side openings 711 connected to the air duct cavity, the two side openings 711 are arranged on both sides of the air duct frame 71 along the thickness direction, the air duct plate 72 is connected to the air duct frame 71, and the two air duct plates 72 respectively cover the two side openings 711, the air duct plate 72 is provided with an air opening 721 connected to the air duct cavity, and each battery cell group 4 of the battery pack is arranged on both sides of the air duct 7 along the thickness direction. The battery cell group 4 includes a plurality of battery cell monomers 41, each battery cell monomer 41 is arranged in sequence, and a heat sink 42 is provided between adjacent battery cell monomers 41, and the heat sink 42 has a ventilation gap, and an insulating sheet 43 is provided between the two ends of the battery cell monomer 41 and the front shell and the rear shell. The front end shell 2 is provided with a fan 26, and one end of the air duct frame 71 along the length direction is provided with a vent. The fan 26 is directly opposite to the vent of the air duct frame 71. After the fan 26 is started, the outside air can flow into the air duct cavity from the ventilation gap, and then be discharged from the vent under the action of the fan 26, so as to achieve the purpose of cooling the battery cell 41. The air duct plate 72 is provided with a plurality of air vents 721, and each air vent 721 is sequentially arranged along the length direction of the air duct plate 72. In the direction from the front end shell 2 to the rear end shell 3, the area of ​​each air vent 721 increases step by step. The air vent 721 close to the fan 26 has a large wind force, so the area is small, and the air vent 721 far from the fan 26 has a small wind force, so the area is large, so that the air volume at each battery cell 41 is balanced, which is conducive to uniform heat dissipation of each battery cell 41.

[0064] In some possible implementations, see Figure 5 and Figure 8 As shown, the battery pack case includes a side reinforcing beam 8, the side reinforcing beam 8 includes a first horizontal plate 81 and a first vertical plate 82, the bottom plate 1 has a bottom plate body 11 and third flanges 13 located on both sides of the bottom plate body 11 along the width direction, the first horizontal plate 81 is attached to the bottom plate body 11, the first vertical plate 82 is attached to the third flange 13, and the side reinforcing beam 8 is limited to the outside of the battery cell group 4. The side reinforcing beam 8 enhances the structural strength of the case and avoids deformation of the case during the process of extruding and assembling the battery cell group 4.

[0065] The side reinforcing beam 8 has an inner support structure, which includes a second vertical plate 83 and a second horizontal plate 84, the second vertical plate 83 and the second horizontal plate 84 are smoothly connected, the first horizontal plate 81 is connected to the second vertical plate 83, the first vertical plate 82 is connected to the second horizontal plate 84, and the second vertical plate 83 is attached to one side of the battery cell group 4 along the width direction. The second vertical plate 83 and the second horizontal plate 84 are smoothly connected, and the transition part between the two is smoothly transitioned, which will not cause cutting hazards to the battery module.

[0066] The bottom plate body 11 has a flat bottom shell and two inner convex shells. The inner convex shells can be stamped on the flat bottom shell. The height of the inner convex shells is higher than the flat bottom shell and can be used to support the battery cell group 4. The first horizontal plate 81 can be attached to the flat bottom shell close to the third flange 13. The first horizontal plate 81 can be at the same horizontal height as the inner convex shells, and can work together to stably support the battery cell group 4.

[0067] See also Figure 5 and Figure 8 As shown, the box shell includes two cross beams 10, the two ends of which are respectively connected to the front shell 2 and the rear shell 3. The cross beams 10 are located on both sides of the battery pack 4 to prevent the battery pack 4 from tilting during transportation. A reinforcing side plate 9 is provided at the rear of the box shell to connect the rear shell 3 and the bottom plate 1, and to prevent the rear shell 3 from deforming the lower part of the box shell during the extrusion process.

[0068] See also Fig.11 As shown, the battery group 4 may include multiple battery cells, each of which may be a lithium battery cell. Each battery cell may be connected front and back through a heat sink 42 and foam. A battery group 4 may be formed by 12 battery cells. The two battery cells at both ends of the battery group 4 are directly pressed against the side wall of the box shell through an insulating sheet 43 after being squeezed, that is, pressed against the front shell 2 and the rear shell 3, thereby realizing the battery cell integration in a module-free form, and changing the previously common end plate steel belt bundling type integration back into the box into a method of directly integrating inside the box shell. The battery groups 4 on the left and right sides are connected in series in the order of positive and negative poles, and the two battery groups 4 are separated by the air duct 7 in the middle of the box shell, and a PC sheet is pasted on the air duct 7 to insulate the battery cell 41. The hanging ear 211 on the front shell 2 of the box shell can be used for cluster-level fixation of the battery pack.

[0069] The heat sink 42 may be in the form of a harmonica tube. When the battery cell 41 is heated up during operation, part of the heat may be dissipated through the cavity inside the heat sink 42. All heat sinks 42 may be molded using a unified mold to reduce costs and achieve uniform heat dissipation with a plastic air duct plate 72. The plastic air duct plate 72 may be made of an epoxy board material.

[0070] An integrated busbar 100 is installed on the upper side of each battery cell group 4 of the battery pack. The conductive aluminum busbar 102 on the integrated busbar 100 is hot-riveted on the blister bracket 101. The conductive aluminum busbar 102 is electrically connected by welding with the pole ears of the battery cell monomer. At the same time, a wiring groove is arranged on the blister bracket 101 to facilitate the wiring of the voltage and temperature collection harness 200. The integrated busbar 100 is arranged to cover the battery cell group 4 on an entire large surface. The strength of the integrated busbar 100 is enhanced while ensuring the stability of the electrical connection, saving the space required for the series connection of the two battery cell groups 4 at the rear.

[0071] The connector 5 on the outer panel 22 includes a positive connector 51 and a negative connector 52. The positive and negative connectors 52 are connected in series with the output conductive aluminum bar 103 on the integrated busbar 100 through the wiring copper bar 6 to form a loop. The positive connector 51 and the negative connector 52 are placed on the outer panel 22 to facilitate the serial connection of adjacent battery packs after the battery packs are clustered, reducing the difficulty of cross-connection. A fan 26 is arranged in the middle of the outer panel 22, and the air outlet 721 of the fan 26 faces the above-mentioned air duct 7 to reduce the temperature of the battery cell group 4. A BMU 27 is arranged on the other side of the outer panel 22. The above-mentioned collection harness 200 and the adapter harness of the fan 26 are connected to the BMU 27 to realize the collection of voltage and temperature and the speed control of the fan 26. The BMU 27 and the positive and negative connectors 52 are arranged on both sides separately so that the placement of the BMU 27 will not interfere with the copper bar, that is, it will not affect the electrical connection of the entire battery pack, and it is convenient for the routing of the collection harness 200 and the fan 26 adapter harness.

[0072] One end of the copper busbar 6 is connected to the positive and negative connectors 52, and the other end is connected to the output pole conductive aluminum busbar 103. The extended part of the output pole conductive aluminum busbar 103 is overlapped on the terminal seat, and the terminal seat is directly placed in the preset slot on the box shell, which eliminates the use of the module end plate, and the integrated form is more convenient and fast. The winding of the copper busbar 6 avoids the air inlet 721 position of the air duct 7, and is connected to the connector 5 after extending through the avoidance port 2311. This arrangement makes the winding methods of the two copper busbars 6 not affect each other, avoiding the possibility of damage to the insulation skin of the copper busbar 6, and the winding of the copper busbar 6 does not affect the normal air intake of the fan 26.

[0073] After the battery cell group 4 is stacked, the rear end shell 3 directly uses one end of the extrusion surface to extrude the battery cell group 4. The extrusion surface of the rear end shell 3 is smooth and flat as a whole. When the battery cell group 4 needs to be extruded, the rear end shell 3 is first overlapped on the plane of the bottom plate 1 of the box shell, and then the rear end shell 3 is extruded by the extrusion tool to reach the specified position and then the rear end shell 3 is fixed to complete the one-piece extrusion molding. At the same time, a reinforcing rib 31 is longitudinally arranged on the other side of the rear end shell 3 to ensure that the rear end shell 3 does not deform during the extrusion process.

[0074] The battery pack also includes an upper cover 300, which directly covers the entire battery cell group 4 to ensure that all battery cell groups 4 are covered, thereby reducing costs while ensuring insulation. The upper cover 300 can be fixedly connected to the box body by plastic rivets on all sides, which is easy to disassemble and maintain.

[0075] 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. An air-cooled battery pack for energy storage, characterized in that: include: A box shell, the box shell having a bottom plate, a front end shell, a rear end shell and a connector, the front end shell and the rear end shell are both connected to the bottom plate, the front end shell has a first cavity, a second cavity is formed between the front end shell and the bottom plate, a avoidance port connecting the first cavity and the second cavity is provided on the front end shell, the connector is provided on the front end shell, and a battery cavity is formed between the bottom plate, the front end shell and the rear end shell; A battery cell group, the battery cell group is arranged in the battery cavity; A wiring copper bar, wherein the wiring copper bar is at least partially located in the first cavity, two ends of the wiring copper bar are electrically connected to the battery cell group and the connector respectively, the avoidance is located on the extension path of the wiring copper bar, and the wiring copper bar partially extends to the avoidance.

2. The battery pack according to claim 1, characterized in that: The wiring copper busbar has a bending and turning portion, and at least the bending and turning portion extends into the avoidance opening.

3. The battery pack according to claim 2, characterized in that: The avoidance opening is a long strip opening extending along the width direction of the box shell, and a partial structural section of the wiring copper busbar extends along the long strip opening.

4. The battery pack according to claim 1, characterized in that: The front end shell includes an inner bracket, an outer panel and a bottom bracket; The bottom bracket is fixedly connected to the bottom plate, the second cavity is formed between the bottom bracket and the bottom plate, and the avoidance opening is arranged on the bottom bracket; The inner bracket and the outer panel are respectively arranged on both sides of the bottom bracket, and the first cavity is formed between the bottom bracket, the inner bracket and the outer panel; The connector is arranged on the outer panel.

5. The battery pack according to claim 4, characterized in that: The bottom plate comprises a bottom plate body and a first flange located at one end of the bottom plate body along the length direction; The bottom bracket includes a flat plate and second flanges located on both sides of the flat plate, and the two second flanges extend to both sides of the flat plate in the thickness direction respectively; One of the second flanges is connected to the first flange, and another of the second flanges is connected to the bottom plate body. The second cavity is formed between the flat plate and the bottom plate, and the avoidance opening is arranged on the flat plate.

6. The battery pack according to claim 4, characterized in that: The front end shell has a plurality of support frames, the support frames are located between the inner bracket and the outer panel, the support frames are fixedly connected to the inner bracket, and the outer panel is fixed to the support frames by fasteners, and part of the support frames are fixedly connected to the bottom bracket.

7. The battery pack according to claim 6, characterized in that: The support frame includes a middle support frame and two side support frames, the two side support frames are fixedly connected to the bottom bracket, and the side support frames are respectively connected to the inner bracket and the outer panel; The middle support frame is located between the two side support frames, and the two sides of the middle support frame along the thickness direction of the outer panel are respectively connected to the inner bracket and the outer panel by fasteners; A limiting piece is arranged on the middle supporting frame, and a collection harness connecting the battery cell group is limitedly matched with the limiting piece.

8. The battery pack according to claim 1, characterized in that: The air duct comprises an air duct frame and two air duct plates; The air duct frame is arranged in the box shell, and the air duct frame has an air duct cavity and two side openings connected to the air duct cavity, and the two side openings are arranged on both sides of the air duct frame along the thickness direction; The air duct plate is connected to the air duct frame, and the two air duct plates cover two side openings respectively, and the air duct plate is provided with an air port connected to the air duct cavity; The battery cell components of the battery pack are arranged on both sides of the air duct along the thickness direction.

9. The battery pack according to claim 1, characterized in that: The box shell includes a side reinforcement beam, and the side reinforcement beam includes a first horizontal plate and a first vertical plate; The bottom plate comprises a bottom plate body and third flanges located on both sides of the bottom plate body along the width direction; The first horizontal plate is connected to the bottom plate body, and the first vertical plate is connected to the third flange; The side reinforcement beam is located at the outer side of the battery cell group.

10. The battery pack according to claim 9, characterized in that: The side reinforcement beam has an inner support structure, the inner support structure includes a second vertical plate and a second horizontal plate, the second vertical plate and the second horizontal plate are smoothly connected, the first horizontal plate is connected to the second vertical plate, and the first vertical plate is connected to the second horizontal plate; The second vertical plate is attached to one side of the battery cell group along the width direction.

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