Battery pack

Abstract

The invention discloses a battery pack. The battery pack comprises a shell and a battery module, a cavity is defined by the shell. The battery modules are arranged in the cavity, a tab is arranged at one end of each battery module in the first direction, and the two ends of each battery module in the second direction are attached to the inner wall of the shell. The two ends, in the second direction, of the battery module of the battery pack are attached to the inner wall of the shell, heat generated by the battery module can be rapidly guided into the shell, heat exchange is conducted between the shell and external air, and therefore the natural cooling effect on the battery module is achieved, the heat dissipation effect is good, and the use cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] The cooling design scheme of the battery pack in the prior art is usually liquid cooling and air cooling. The battery packs with the above two heat dissipation forms are suitable for large-scale energy storage system solutions such as industry, commerce, and power grids, and have high use costs. For example, small energy storage, similar to base station power supplies and household energy storage, due to cost, space, size, weight and other issues, it is difficult or impossible to achieve liquid cooling and air cooling, which basically belongs to the no cooling mode. Most of the existing small systems such as base station power supplies and household energy storage are naturally cooled, that is, they rely on the battery cell itself to operate within the tolerable temperature range. Natural cooling has slow heat dissipation and poor heat dissipation effect, which can easily cause problems such as temperature rise and large temperature difference in the battery system.

[0003] The traditional natural cooling solution is to install the battery module directly in the battery box. The battery module does not even have direct contact with the inner wall of the box. The heat of each cell of the battery module is dissipated through the air inside the box. The heat conduction efficiency is low and the cooling effect is poor, which affects the performance and life of the battery cell. Summary of the invention

[0004] In order to solve one of the above technical problems, the present application provides a battery pack.

[0005] The present invention adopts the following technical solutions:

[0006] A battery pack, comprising:

[0007] A shell, wherein the shell encloses a cavity;

[0008] A battery module is arranged in the cavity, a pole ear is arranged at one end of the battery module along the first direction, and both ends of each battery module along the second direction are attached to the inner wall of the shell.

[0009] Optionally, the shell includes a main shell and two end shell parts, the main shell has two main boards and two side boards, the area of ​​the main board is larger than the area of ​​the side boards, the two main boards are spaced apart and arranged in parallel, the two side boards are respectively located on both sides of the main board, and the side boards are respectively connected to the two main boards, the main board and the side boards enclose a cavity and two openings communicating with the cavity, the two end shell parts are respectively arranged at both ends of the main shell, and the two end shells respectively cover the corresponding openings;

[0010] The two sides of the battery module along the second direction are respectively attached to the two main boards.

[0011] Optionally, the battery pack includes a heat conductive member, which is located in the cavity and is in thermal contact with the battery module and the mainboard respectively.

[0012] Optionally, the heat conductive member is a flexible sheet, the heat conductive sheet covers both sides of the battery module along the second direction, and the heat conductive member fits the inside of the mainboard.

[0013] Optionally, the battery module includes a plurality of battery cells, and the battery cells are arranged in sequence along the thickness direction;

[0014] The flexible sheet is attached to the thickness end surfaces of both sides of each battery core along the second direction.

[0015] Optionally, the battery module includes two steel strips;

[0016] The steel belt is sleeved on each battery core;

[0017] The flexible sheet is located between the two steel belts.

[0018] Optionally, the thickness of the flexible sheet is greater than the thickness of the steel strip.

[0019] Optionally, the battery module is provided with end plates at both ends along the length direction;

[0020] One end of the fastener passes through the main board and is connected to the end board;

[0021] The other end of the fastener is limited to the main board.

[0022] Optionally, a size of a battery cell of the battery module along a first direction is greater than a size of the battery cell along a second direction.

[0023] Optionally, the battery pack includes a jumper copper bar and two battery modules;

[0024] The two battery modules are spaced apart and arranged in parallel, and an aluminum bar and a terminal block are arranged at the ends of the two battery modules that are away from each other. The aluminum bar is used to connect the cells of the battery module, and the terminal block is connected to the aluminum bar at the end of the battery module;

[0025] The bridging copper bar extends along the arrangement direction of the two battery modules, and two ends of the bridging copper bar are respectively connected to the connection sockets of the two battery modules.

[0026] By adopting the above technical solution, the present application has the following beneficial effects:

[0027] The battery module of the battery pack of the present application is attached to the inner wall of the shell at both ends along the second direction. The heat generated by the battery module can be quickly introduced into the shell, and the shell exchanges heat with the external air, thereby achieving a natural cooling effect for the battery module, with good heat dissipation effect and low use cost.

[0028] 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

[0029] 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:

[0030] Figure 1 A schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the present application;

[0031] Figure 2 A front view of a battery pack provided in an embodiment of the present application;

[0032] Figure 3 An exploded view of a housing of a battery pack provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the internal structure of a battery pack provided in an embodiment of the present application;

[0034] Figure 5 A cross-sectional view of a battery pack provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the structure of a battery module of a battery pack provided in an embodiment of the present application;

[0036] Figure 7 Another perspective view of the internal structure of the battery pack provided in the embodiment of the present application;

[0037] Figure 8 A schematic diagram of the structure of an end plate of a battery pack provided in an embodiment of the present application;

[0038] Fig. 9 A schematic diagram of the structure of a mainboard of a battery pack provided in an embodiment of the present application;

[0039] Fig.10 A schematic diagram of the structure of a side plate of a battery pack provided in an embodiment of the present application;

[0040] Fig.11 A schematic diagram of the structure of the air duct plate of the battery pack provided in an embodiment of the present application;

[0041] Fig.12 A schematic diagram of the structure of the main shell of the battery pack provided in an embodiment of the present application;

[0042] Fig.13for Fig.12 The enlarged view of point A in the middle;

[0043] Fig.14 A schematic diagram of the structure of a battery cell of a battery pack provided in an embodiment of the present application;

[0044] Fig.15 A schematic diagram of the structure of the connection cables of each battery pack in the battery box provided in an embodiment of the present application.

[0045] In the figure: housing 1, main housing 11, main board 111, first convex rib 1111, side plate 112, side plate body 1121, bent plate 1122, second convex rib 1122a, transition beam 1123, assembly hole 1123a, end shell 12, positive electrode electrical interface 121, negative electrode electrical interface 122, first communication interface 123, second communication interface 124, ventilation portion 125, recessed portion 126, through hole 1261 , convex strip c, connecting port 127, battery module 2, battery cell 21, pole ear 211, air duct plate 22, ventilation channel 221, aluminum bar 23, steel belt 24, end plate 25, threaded hole 251, terminal block 26, fan 3, BMS slave board 4, heat conducting member 5, jumper copper bar 6, slide groove a, slide bar b, wiring harness 7, communication line 8, insulating baffle 9, main baffle 91, side baffle 92, first air duct 10, second air duct 20.

[0046] 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

[0047] 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.

[0048] 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.

[0049] 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.

[0050] See also Figures 1 to 15 As shown, an embodiment of the present application provides a battery pack, including: a shell 1 and a battery module 2. The shell 1 encloses a cavity. The battery module 2 is arranged in the cavity, and a pole ear 211 is arranged at one end of the battery module 2 along the first direction, and both ends of each battery module 2 along the second direction are attached to the inner wall of the shell 1. The first direction is along the height (or length) direction of the battery cell, and the second direction is along the width direction of the battery cell. Both ends of the battery module 2 of the battery pack of the present application along the second direction are attached to the inner wall of the shell 1, and the heat generated by the battery module 2 can be quickly introduced into the shell 1, and the shell 1 performs heat exchange with the external air, so as to achieve a natural cooling effect for the battery module 2 group, with good heat dissipation effect and low use cost.

[0051] like Figure 1 , Figure 3 and Figure 5 As shown, the housing 1 includes a main housing 11 and two end housing parts 12. The main housing 11 has two main boards 111 and two side panels 112. The area of ​​the main board 111 is larger than that of the side panels 112. The two main boards 111 are spaced apart and arranged in parallel. The two side panels 112 are respectively located on both sides of the main board 111, and the side panels 112 are respectively connected to the two main boards 111. The main board 11 and the side panels 112 enclose a cavity and two openings connecting the cavity. The two end housing parts 12 are respectively arranged at both ends of the main housing 11, and the two end housing parts 12 cover the corresponding openings respectively. The battery module 2 is respectively attached to the two main boards 111 on both sides along the second direction. The two main boards 111 are perpendicular to the second direction, which is also the direction along the width of the battery cell. The two main boards 111 and the two side panels 112 constitute the panels of the main housing.

[0052] In one possible embodiment, Figure 4 and Figure 7As shown, the battery pack includes a heat conductive member 5, the heat conductive member 5 is located in the cavity, and the heat conductive member 5 is in thermal contact with the battery module 2 and the main board 111 respectively. There may be a plurality of heat conductive members 5, some of which are arranged between one main board 111 and the thickness end face of the battery cell 21 (i.e., one side end face of the battery cell 21 along the width direction), and some of which are arranged between another main board 111 and the thickness end face of the battery cell 21 (the other side end face of the battery cell 21 along the width direction).

[0053] The heat conducting member 5 may be a flexible sheet, and the heat conducting member 5 covers both sides of the battery module along the second direction, and the heat conducting member 5 fits inside the main board 111. The flexible sheet fits on the thickness end faces on both sides of each battery cell 21 along the second direction. That is, on the thickness end faces of the battery cell 21 along the width direction, the thickness end faces are the large faces of the battery cell 21 exposed to the battery module 2, which increases the area of ​​fit between the battery cell 21 and the main board 111, increases the heat dissipation area, and improves the heat dissipation efficiency. The flexible sheet is arranged on the thickness end faces on both sides of the battery module 2 along the width direction, and the flexible sheet has a certain thickness. The flexible sheet is compressed and arranged between the battery module 2 and the main board 111, which can eliminate the gap tolerance between the battery module 2 and the main board 111. The flexible sheet may be a thermally conductive silicone, which has a buffering and protective effect, and has good thermal conductivity, thereby significantly improving the heat dissipation efficiency.

[0054] like Figure 5 As shown, the battery module 2 includes a plurality of battery cells 21, and each battery cell 21 is arranged in sequence along the thickness direction. The flexible sheet is attached to the thickness end faces on both sides of each battery cell 21 along the second direction. That is, the thickness end faces of the battery cell 21 along the width direction, and the thickness end faces are the large faces of the battery cell 21 exposed to the battery module 2, which increases the area of ​​attachment between the battery cell 21 and the main board 111, increases the heat dissipation area, and improves the heat dissipation efficiency.

[0055] In one possible embodiment, Figure 4 , Figure 6 and Figure 7As shown, the battery module 2 includes two steel belts 24. The steel belt 24 is sleeved on each battery cell 21. The flexible sheet is located between the two steel belts 24. The area between the two steel belts 24 is large, which is convenient for laying out the flexible sheet. The steel belt 24 protrudes from the surface of each battery cell 21, making it inconvenient for the flexible sheet to fit on the entire thickness end surface of the battery cell along the width direction. In the embodiment of the present application, the flexible sheet can be located between the two steel belts 24, and the flexible sheet can be completely fitted on the thickness end surfaces on both sides of each battery cell 21 along the second direction without being interfered by the steel belt 24, and the fitting effect is good. If the flexible sheet is covered on the steel belt 24, the flexible sheet will be uneven after fitting, which is not conducive to fitting on the main board 111, and loose fitting will affect the heat dissipation efficiency.

[0056] The thickness of the flexible sheet is greater than the thickness of the steel strip 24. At least in the absence of external force, the thickness of the flexible sheet is greater than (or higher than) the thickness of the steel strip 24, so that the flexible sheet first contacts the inner wall of the main board 111, which can eliminate the tolerance gap between the main board 111 and the battery module 2, so that the flexible sheet can be completely attached to the main board 111, so that the heat generated by the battery module 2 can be quickly conducted to the main board 111 through the heat conductive member 5, so that the main board 111 can exchange heat with the outside air, thereby realizing natural cooling of the battery pack, and the cooling effect is significant.

[0057] like Figure 6 and Figure 8 As shown, the battery module 2 is provided with end plates 25 at both ends along the length direction. One end of the fastener passes through the main board 111 and is connected to the end plate 25. The other end of the fastener is limited to the main board 111. The end plate 25 is vertically connected to the main board 111, and the thickness end surface of the end plate 25 is attached to the main board 111, which can transfer the heat of the end plate 25 to the main board 111, further increasing the heat dissipation effect. The fastener can be a screw, and the end plate 25 is attached to the thickness end surface of the main board 111 and is provided with a threaded hole 251. The main board 111 is provided with a connecting hole, and the rod body of the screw passes through the connecting hole and is threadedly connected to the threaded hole 251, and the cap body of the screw is limited to the side of the main board 111 away from the end plate 25.

[0058] The size of the battery cell 21 of the battery module 2 along the first direction is larger than the size of the battery cell 21 along the second direction. The size between the two main boards 111 is slightly larger than the size of the battery cell 21 along the second direction, which reduces the height of the battery pack. The matching structure of the battery module 2 and the housing 1 of the present application makes the battery pack smaller in thickness, which is convenient for use in some special scenarios.

[0059] The battery module 2 and the shell 1 form a first air duct 10 and a second air duct 20. The battery module 2 includes a plurality of battery cells 21. Adjacent battery cells 21 have ventilation channels 221 connecting the first air duct 10 and the second air duct 20. Adjacent battery cells 21 are connected by aluminum bars 23. The aluminum bars 23 are located on the air path between the first air duct 10 and the second air duct 20. The battery cell 21 of the battery pack of the present application has a side where the tabs 211 are provided without covering the busbar. Instead, the adjacent battery cells 21 are directly connected by the aluminum bars 23, so that the aluminum bars 23 and the tabs 211 are located on the air path between the first air duct 10 and the second air duct 20. The air flowing through the air path can take away the heat from the aluminum bars 23 and the tabs 211, thereby cooling the aluminum bars 23 and the tabs 211 and improving the heat dissipation efficiency of the battery pack. The battery pack of the present application achieves effective heat dissipation of the battery cell tabs.

[0060] like Figure 5 As shown, the battery pack includes two battery modules 2, and the two battery modules 2 are arranged at an interval. The first air duct 10 is formed between the two battery modules 2. The second air duct 20 is formed between the two battery modules 2 and the housing 1 on the side away from the first air duct 10. The aluminum bar 23 is located on one side of the second air duct 20, and the air flowing through the air path can take away the heat on the aluminum bar 23, thereby improving the heat dissipation efficiency of the battery pack.

[0061] like Figure 5 As shown, the second air duct 20 is formed between the battery module 2 and the side plate 112. The first air duct 10 is arranged in the middle position of the battery pack along the width direction, and the second air duct 20 is arranged at both sides of the battery pack along the width direction. The air paths are symmetrical, so that both sides of the battery module 2 can be evenly cooled.

[0062] In one possible embodiment, Figure 1 and Figure 3 As shown, a fan 3 is arranged on the end shell 12, and the fan 3 is located at one end of the first air duct 10. The function of the fan 3 can be to discharge the air in the first air duct 10 to the outside.

[0063] Such as 3 and Figure 4 As shown, ventilation parts 125 are respectively provided on both sides of the end shell 12, and the ventilation parts 125 on both sides are respectively connected to the two second air ducts 20. Under the action of the fan 3, an air flow path is formed from the ventilation part 125 to the second air duct 20, then from the second air duct 20 to each ventilation channel 221, and the ventilation channel 221 to the first air duct 10, and finally the hot air is discharged from the fan 3 to the outside of the battery pack, thereby completing the cooling process of the battery module 2, and the cooling effect is good.

[0064] like Figure 3 and Figure 4 As shown, the ventilation part 125 and the fan 3 are arranged on different end shell parts 12. One side of the battery pack is used for air intake and the other side is used for air exhaust. The cold air entering the cavity can flow evenly through each battery cell 21 in the battery pack, which has a good cooling effect and is convenient for the layout of the battery pack.

[0065] like Figure 4 As shown, the battery module 2 includes a plurality of battery cells 21, each of which is arranged in sequence, and the two side end surfaces of the battery cells 21 along the width direction are respectively attached to the two main boards 111. Fig.14 As shown, the battery cell 21 of the present application is a rectangular parallelepiped structure with three dimensions of length direction z (or height direction), thickness direction y and width direction x. The battery cell 21 of the present application is basically the same in shape as the conventional battery cell 21 in the prior art. In the prior art, the length direction z (or height direction) of the battery cell 21 is perpendicular to the main board 111. The length direction of the battery cell 21 of the battery pack of the present application is perpendicular to the side plate 112. That is, the battery cell 21 of the present application is assembled by rotating the conventional battery cell 21 in the prior art by ninety degrees. The two larger end faces of the battery cell 21 of the present application along the width direction are respectively attached to the corresponding main board 111, and can be in heat exchange contact with the main board 111, thereby further improving the heat dissipation efficiency of the battery cell 21. And the matching structure of the battery module 2 and the shell 1 of the present application makes the thickness of the battery pack smaller, which can be conveniently used in certain special scenarios.

[0066] like Figure 5 As shown, along the thickness direction of the main board 111, both sides of the battery module 2 are in contact with the two main boards 111. The battery cell 21 of the battery pack of the present application is perpendicular to the main board 111 in the width direction, and the thickness end surface of the battery cell 21 in the width direction is in contact with the main board 111. The tab 211 and the aluminum row 23 are located in the second air duct 20, and the end of the battery cell 21 opposite to the tab 211 is located in the first air duct 10, so that the surface of the battery cell 21 exposed to the battery module 2 is effectively cooled, and the heat dissipation efficiency is high. The large area of ​​the main board 111 is conducive to the heat dissipation of the battery module 2.

[0067] A flexible sheet is compressed and arranged between the battery module 2 and the main board 11. The flexible sheet is arranged on the thickness end faces of both sides of the battery module 2 along the width direction. The flexible sheet has a certain thickness. The flexible sheet can be compressed and arranged between the battery module 2 and the main board 111 to eliminate the gap tolerance between the battery module 2 and the main board 111. The flexible sheet can be a thermally conductive silica gel, which has a buffering and protective effect and good thermal conductivity, thereby significantly improving the heat dissipation efficiency.

[0068] In one possible embodiment, as 6 and Fig.11 As shown, an air duct plate 22 is provided between adjacent cells 21 in the battery module 2, and the air duct plate 22 has the ventilation channel 221. An aluminum row 23 connects two adjacent cells 21, and the aluminum row 23 is perpendicular to the air duct plate 22, and the aluminum row 23 is perpendicular to the ventilation channel 221. There is a gap between the aluminum row 23 and the air duct plate 22. Under the action of the fan 3, cold air flows from the ventilation part 125 to the second air duct 20, then flows through the aluminum row 23 and the pole ear 211, then to the gap, and then passes through the ventilation channel 221 of the air duct plate 22, and finally flows into the first air duct. The gap prevents heat from accumulating on the aluminum row 23 to form a heat dissipation dead corner, and the cooling effect is good.

[0069] In one possible embodiment, Figure 7 As shown, the battery pack includes a jumper copper bar 6. A plurality of aluminum bars 23 (or aluminum bars) and terminal blocks 26 are arranged at the ends of the two battery modules 2 that are separated from each other. The aluminum bars 23 are used to connect the cells 21 of the battery modules 2, and the terminal blocks 26 are connected to the aluminum bars 23 at the ends of the battery modules 2. The jumper copper bar 6 extends along the arrangement direction of the two battery modules 2, and the two ends of the jumper copper bar 6 are respectively connected to the terminal blocks 26 of the two battery modules 2. The jumper copper bar 6 realizes the series connection of the two battery modules 2, and the jumper copper bar 6 is located on one side of the end plate 25 along the thickness direction.

[0070] The end shell 12 of the battery pack in the prior art is provided with a positive electrical interface and a negative electrical interface, and the positive electrical interface and the negative electrical interface are arranged in sequence along the length direction of the end shell (that is, the width direction of the battery pack). When the battery packs in the same column are connected in series with such a structure, in two adjacent battery packs, the positive electrical port of one battery pack needs to be connected to the negative electrical port of the other battery pack through an inclined cable, which makes the routing of the cables or wire harnesses between the battery packs irregular, and the cables and wire harnesses are prone to crossover. In order to solve this problem, two methods are adopted in the prior art;

[0071] The first method is to use two types of battery packs, A and B, for each battery pack in the battery box. For example, one of the two battery packs adjacent to each other in the battery box is battery pack A, and the other is battery pack B. The positive electrical interface of battery pack A is on the left and the negative electrical interface is on the right. The positive electrical interface of battery pack B is on the right and the negative electrical interface is on the left. In this way, the positive electrical interface of battery pack A is connected to the negative electrical interface of battery pack B through a vertical cable between the adjacent battery packs, which makes wiring very convenient. However, two types of battery packs need to be set up inside such a battery box, which increases production costs and assembly processes, is not conducive to improving production efficiency, and it is easy to connect the wrong cables.

[0072] The second method is to set only one type of battery pack in the battery box, and the battery packs are connected in series by arranging them horizontally. This structure makes the wiring structure of the battery packs complicated during the series connection process, and it is easy to connect the wrong cables, resulting in system or personnel accidents.

[0073] In order to solve the above problems, the battery pack of the present application is provided with a positive electrical interface 121 and a negative electrical interface 122 on one of the end shell parts 12, and the positive electrical interface 121 and the negative electrical interface 122 are arranged in sequence along the longitudinal direction of the shell 1. The battery module 2 is arranged in the cavity, and the battery module 2 is electrically connected to the positive electrical interface 121 and the negative electrical interface 122, respectively. Among them, the longitudinal direction of the shell 1 is the direction perpendicular to the support surface when the shell 1 is supported on the support surface. For example: when the battery pack of the present application is arranged in a battery box, a support plate is arranged in the battery box, the battery pack is supported on the support plate, and the support surface is the support plate. The longitudinal direction of the shell 1 is the direction perpendicular to the support plate.

[0074] The positive electrical interface 121 and the negative electrical interface 122 of the battery pack of the present application are arranged in sequence along the longitudinal direction of the shell 1. The battery box does not need to be stacked in a combination of two battery packs A and B. Only one battery pack is required to be arranged in the battery box for convenient wiring. The cable connection of the battery pack is simple and has no crossover. The wiring is neat and the cable harness is convenient to route. It is not easy to connect the wrong cables to cause damage to the system or injury to personnel. The safety factor is high during the system installation process, the battery pack types are unified, the production process is simple, the production cost is low, and the production efficiency is high.

[0075] like Figure 1 , Figure 2 and Figure 3 As shown, the end shell portion 12 is provided with a first communication interface 123 and a second communication interface 124, the first communication interface 123 and the second communication interface 124 are electrically connected to the battery module 2, and the first communication interface 123 and the second communication interface 124 are sequentially arranged along the longitudinal direction of the shell 1. The arrangement of the first communication interface 123 and the second communication interface 124 is consistent with the arrangement of the electrical interface, and the wiring method is also consistent, so it also has the effect of facilitating wiring.

[0076] like Figure 1 , Figure 2 and Figure 3 As shown, the first communication interface 123 and the second communication interface 124 are arranged on one side of the end shell 12 in the horizontal direction, and the positive electrical interface 121 and the negative electrical interface 122 are arranged on the other side of the end shell 12 in the horizontal direction. The horizontal direction is perpendicular to the longitudinal direction. The communication interface and the electrical interface are respectively located on both sides of the end shell 12 in the horizontal direction, and the two do not interfere with each other, and the wiring cables do not interfere with each other, which improves safety.

[0077] like Figure 1 , Figure 2 and Figure 3 As shown, the end shell 12 is provided with a communication port 127 connected to the cavity, and the fan 3 is installed on the end shell 12, and the fan 3 covers the communication port 127. The fan 3 is located between the positive electrical interface 121 and the second communication interface 124. The fan 3 provides wind flow power for the wind duct inside the battery pack.

[0078] In one possible embodiment, Figure 1 and Figure 2 As shown, the battery pack includes a BMS slave board 4, which is mounted on the end shell 12, and the BMS slave board 4 is located between the fan 3 and the second communication interface 124. The BMS slave board 4 and the communication interface are located on the same end shell 12, which is convenient for wiring and maintenance, and the arrangement position of the BMS slave board 4 does not affect the arrangement of the communication interface and the electrical interface.

[0079] The battery case 1 of the prior art generally includes a main body and a cover. Nuts need to be embedded in the main body, and the main body and the cover are connected and fixed by multiple screws. This makes the assembly structure of the case 1 use a lot of screws, and the manufacturing process requires a large number of screws, which increases the production cost, reduces the assembly efficiency, and affects the production efficiency. Fig.12 and Fig.13 As shown, the battery pack of the present application is provided with a slide groove a in one of the main board 111 and the side board 112, and a slide bar b in the other. The slide groove a and the slide bar b can be slidably matched, so that the two can be pulled out to achieve assembly or separation. This structure adopts a wedge-shaped structure solution, replacing the structure of the prior art in which the embedded nuts are connected by screws, saving a large number of screws, reducing production costs, and improving assembly efficiency.

[0080] It should be noted that the main board 111 and the side panel 112 may both be provided with a slide groove a and a slide bar b, the slide bar b of the main board 111 is connected to the slide groove a of the side panel 112, and the slide bar b of the side panel 112 is connected to the slide groove a of the main board 111, thereby improving the reliability of the assembly structure.

[0081] In one possible embodiment, Fig. 9 and Fig.10 As shown, the side plate 112 includes a side plate body 1121 and bent plates 1122 located on both sides of the side plate body 1121 along the width direction. The main board 111 and the corresponding bent plates 1122 are located in the same plane, and one of the main board 111 and the bent plates 1122 is provided with a slide groove a, and the other is provided with the slide bar b, which facilitates the plug-in matching of the bent plates 1122 and the main board 111.

[0082] There is a gap between the projection of the battery module 2 onto the main board 111 and the bent plate 1122. Thus, when the plate (such as the side plate 112) is disassembled, the bent plate 1122 will not contact with the battery module 2 and interfere with it.

[0083] like Fig.12 and Fig.13 As shown, the main board 111 has a first convex rib 1111, the first convex rib 1111 is located in the cavity, and the first convex rib 1111 extends along the length direction of the main board 111, and the bending plate 1122 has a second convex rib 1122a, the second convex rib 1122a is located in the cavity, and the second convex rib 1122a extends along the length direction of the bending plate 1122. One of the first convex rib 1111 and the second convex rib 1122a is provided with the slide groove a, and the other is provided with the slide bar b. The outer surfaces of the main board 111 and the bending plate 1122 are smoothly spliced. The first convex rib 1111 and the second convex rib 1122a are on the inner side of the cavity and do not extend out of the outer surface of the plate, so that the outer surface of the shell is smooth and beautiful in appearance.

[0084] There is a gap between the battery module 2 and the first convex rib 1111. The first convex rib 1111 is located so as not to interfere with the battery module 2, so that when the plate (such as the side plate 112) is disassembled, the bent plate 1122 will not contact and interfere with the battery module 2.

[0085] In a possible implementation, a transition beam 1123 is formed between the side plate body 1121 and the bent plate 1122. The transition beam 1123 is provided with an assembly hole 1123a. The transition beam 1123 is located between the side plate body 1121 and the bent plate 1122. The diameter of the cross section of the transition beam 1123 is large, which increases the structural strength and facilitates the provision of the assembly hole 1123a. A through hole 1261 is provided on the end shell portion 12. One end of the fastener passes through the through hole 1261 and is connected to the assembly hole 1123a, and the other end of the fastener is limited to the end shell portion 12, connecting and fixing the end shell portion 12 and the side plate 112, and the main board 111 is limited to between the two end shell portions 12, thereby completing the assembly of the shell 1.

[0086] like Figure 1 , Figure 2 and Figure 3As shown, the four corners of the end shell 12 are provided with recessed portions 126, and the bottom wall of the recessed portion 126 is provided with the through hole 1261. The assembly hole 1123a has a threaded groove. The fastener includes a screw and a cap body provided at one end of the screw, and the screw passes through the through hole 1261 and is threadedly connected to the assembly hole 1123a. The cap body is limited to the recessed portion 126 so that the cap body does not extend out of the end shell 12, interfere with the external structure, and make the appearance of the battery pack more beautiful. The fastener can be a screw.

[0087] In a possible implementation scheme, each of the panels is an aluminum extruded profile. In the prior art, the shell 1 of the battery pack is usually made of sheet metal. The structural strength of the sheet metal material is not high. When processing the structural parts of the shell 1, the sheet metal material needs to go through a series of processes such as bending, welding, powder spraying or painting. The manufacturing cycle is long and the labor cost is high. In the processing process, it is also necessary to embed nuts. The process of embedding nuts is complicated and the cost is high. In addition, during the use of the shell 1 made of sheet metal, the humid environment will corrode the shell 1, making the shell 1 easy to rust, causing structural failure of the battery pack. The heat dissipation performance of the sheet metal material is not good, and it is not conducive to the natural cooling of the battery pack. The panels of the battery pack of the present application are all aluminum extruded profiles. The aluminum extrusion profile process can form complex shapes. It only needs to be directly extruded by the profile mold. The one-piece molding has high structural strength and simple process, replacing the complex process steps of traditional sheet metal materials. The aluminum material has extremely high corrosion resistance and does not require secondary processing such as spraying an anti-corrosion layer, which greatly reduces the production cost. The aluminum material also has a strong heat conduction effect, which is conducive to the natural cooling of the battery pack.

[0088] In one possible embodiment, Figure 1 , Figure 3 and Fig.10 As shown, a plurality of convex strips c are arranged on the outer surface of the main shell 11 and / or the end shell portion 12, and grooves are formed between adjacent convex strips c. The convex strips c increase the structural strength and increase the contact area with the outside air, so that the heat dissipation performance of the battery pack is better.

[0089] In one possible embodiment, Figure 7 As shown, the battery pack may include an insulating baffle 9 (in some embodiments, the insulating baffle 9 may not be provided), the insulating baffle 9 is located in the second air duct 20, and the insulating baffle 9 is located between each aluminum row and the side plate body 1121. The insulating baffle 9 is located on one side of the pole ear 211 to prevent the pole ear 211 from contacting the inner wall of the shell and causing leakage accidents.

[0090] like Figure 7As shown, the insulating baffle 9 includes a main baffle 91 and side baffles 92 arranged on both sides of the main baffle 91. The main baffle 91 is located in the second air duct 20 and between the aluminum bar 23 and the side plate body 1121. The two side baffles 92 are respectively connected to the two sides of the battery module 2 in the direction perpendicular to the main board 111. The two side baffles 92 are respectively attached to the thickness end surfaces of the battery module 2 on both sides along the width direction. The main baffle 91 may have a through hole 1261, which is conducive to the flow of wind. The main baffle 91 may have a large gap between the tab 211 between the battery cell 21 and the aluminum bar, which does not affect the heat dissipation.

[0091] When the battery pack of the present application is arranged in a battery box, the battery box (not shown) includes a box body and a plurality of battery packs of the present application. The box body is provided with multiple rows and columns of battery cavities. Each battery pack is accommodated in a corresponding battery cavity, respectively. In two adjacent battery packs in the same column, the positive electrical interface 121 of one and the negative electrical interface 122 of the other are close to each other and are located on the same longitudinal line, and the positive electrical interface 121 and the negative electrical interface 122 are connected by a longitudinally extending wiring harness 7. In two adjacent battery packs in the same column of the battery box of the present application, the positive electrical interface 121 of one and the negative electrical interface 122 of the other are close to each other and are located on the same longitudinal line, and the distance is relatively close, which can facilitate wiring.

[0092] like Fig.15 As shown, in two battery packs adjacent in the longitudinal direction, the first communication interface 123 of one and the second communication interface 124 of the other are close to and located on the same longitudinal line, and the first communication interface 123 and the second communication interface 124 are connected by a longitudinally extending communication line 8. The arrangement of the first communication interface 123 and the second communication interface 124 is consistent with the setting of the electrical interface, and the wiring method is also consistent. The cable connection is simple and has no crossover, the wiring is neat, and the cable harness 7 is easy to route. It is not easy to connect the wrong cable to cause damage to the system or personal injury. The safety factor is high during the system installation process, so it also has the effect of convenient wiring.

[0093] like Fig.15 As shown, in two adjacent columns of battery packs, each battery pack in one column is placed with the positive electrode facing upward, and each battery pack in the other column is placed with the negative electrode facing upward. In two adjacent columns of battery packs, each battery pack in one column has its negative electrode electrical interface 122 facing upward, and each battery pack in the other column can be rotated 180° so that the negative electrode electrical interface 122 faces upward, so that two battery packs facing each other at the bottom or top of the two adjacent columns can be connected in series through a horizontal conductor, which has a simple structure, is easy to operate, and significantly improves assembly efficiency.

[0094] The battery packs in the same column are placed in the same way, which can prevent mistakes and simplify the operation. In two adjacent columns of battery packs, the two battery packs at the top are located on the same horizontal plane, the communication ports of the two battery packs are close to each other, and the electrical interfaces are far away from each other. When connected in series, the two communication interfaces are connected by a communication line 8, and the two electrical ports are connected by an electrical connection cable. The wiring of the electrical connection cable (which can be a copper bus) can be higher than the communication line 8, so that there is a gap between the electrical connection cable (or wiring harness) and the communication line 8, and the wiring of the two does not interfere with each other, which is convenient for wiring.

[0095] 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 shell, wherein the shell encloses a cavity; A battery module is arranged in the cavity, a pole ear is arranged at one end of the battery module along the first direction, and both ends of each battery module along the second direction are attached to the inner wall of the shell.

2. The battery pack according to claim 1, characterized in that: The housing comprises a main shell and two end shell parts, the main shell has two main boards and two side boards, the area of ​​the main board is larger than the area of ​​the side boards, the two main boards are spaced apart and arranged in parallel, the two side boards are respectively located on both sides of the main board, and the side boards are respectively connected to the two main boards, the main board and the side boards enclose a cavity and two openings communicating with the cavity, the two end shell parts are respectively arranged at both ends of the main shell, and the two end shells respectively cover the corresponding openings; The two sides of the battery module along the second direction are respectively attached to the two main boards.

3. The battery pack according to claim 2, characterized in that: A heat-conducting member is included, and the heat-conducting member is located in the cavity, and the heat-conducting member is in thermal contact with the battery module and the mainboard respectively.

4. The battery pack according to claim 3, characterized in that: The heat conductive member is a flexible sheet, and the heat conductive sheet covers both sides of the battery module along the second direction. The heat conductive member fits the inside of the mainboard.

5. The battery pack according to claim 4, characterized in that: The battery module comprises a plurality of battery cells, each of which is arranged in sequence along the thickness direction; The flexible sheet is attached to the thickness end surfaces of both sides of each battery core along the second direction.

6. The battery pack according to claim 5, characterized in that: The battery module includes two steel strips; The steel belt is sleeved on each battery core; The flexible sheet is located between the two steel belts.

7. The battery pack according to claim 6, characterized in that: The thickness of the flexible sheet is greater than the thickness of the steel strip.

8. The battery pack according to claim 2, characterized in that: The battery module is provided with end plates at both ends along the length direction; One end of the fastener passes through the main board and is connected to the end board; The other end of the fastener is limited to the main board.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The size of the battery cell of the battery module along the first direction is greater than the size of the battery cell along the second direction.

10. The battery pack according to any one of claims 1 to 8, characterized in that: Includes jumper copper busbar and two battery modules; The two battery modules are spaced apart and arranged in parallel, and an aluminum bar and a terminal block are arranged at the ends of the two battery modules that are away from each other. The aluminum bar is used to connect the cells of the battery module, and the terminal block is connected to the aluminum bar at the end of the battery module; The bridging copper bar extends along the arrangement direction of the two battery modules, and two ends of the bridging copper bar are respectively connected to the connection sockets of the two battery modules.

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