Battery pack and energy storage device with same

Abstract

The utility model relates to the technical field of battery production, in particular to a battery pack and an energy storage device with the battery pack, the battery pack comprises a battery pack shell, an insulating cover, a battery module and a high-voltage busbar, the insulating cover is arranged in the battery pack shell, the insulating cover is provided with a sealing cavity, and the sealing cavity is filled with cooling liquid; the at least two battery modules are immersed in the cooling liquid; the high-voltage busbar is arranged in the battery pack shell and penetrates through the insulating cover, and the high-voltage busbar is tightly connected with the insulating cover, extends into the sealing cavity and is used for connecting two adjacent battery modules in series. According to the battery pack, the sealing cavity is filled with the cooling liquid, it is guaranteed that the cooling liquid is in an insulating environment, the battery modules are immersed in the cooling liquid, the battery modules are connected in series through the high-voltage busbar, stable output of high-voltage current can be achieved, and the heat dissipation effect of the battery pack can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a battery pack and an energy storage device having the battery pack. Background Art

[0002] As the core of new energy electric vehicles, the safety and working reliability of batteries directly affect the safety of new energy electric vehicles. During the high-current charging and discharging process, a large amount of heat will accumulate inside the battery. If it cannot be cooled down in time and effectively, there is a risk of thermal runaway, especially for large-capacity battery modules, which have a higher energy density and higher heat release, which can easily lead to thermal runaway, gas release, smoke, leakage, and even battery combustion and explosion.

[0003] Traditional batteries usually adopt air cooling structure, direct cooling structure and liquid cooling structure for thermal management. Among them, air cooling uses low-temperature air as the medium and utilizes heat convection to reduce the temperature of the battery; direct cooling uses the principle of refrigerant evaporation to carry away latent heat, and establishes an air-conditioning system in the battery system. The refrigerant evaporates in the evaporator and quickly takes away the heat generated by the battery; liquid cooling uses liquid convection heat exchange to take away the heat generated by the battery, thereby reducing the temperature of the battery. Due to the high heat transfer coefficient, large heat capacity and fast cooling speed of the liquid medium, the temperature of the battery can be effectively reduced, so that the battery can fully exert its charging and discharging performance. However, the liquid must be in an insulating environment, otherwise a short circuit is likely to occur. The air tightness and mechanical strength requirements of the liquid cooling structure are high, which has become a difficult problem in the industry.

[0004] In view of this, this application is specially filed. Utility Model Content

[0005] The present application provides a battery pack and an energy storage device having the battery pack, so as to solve the problem of how to ensure that the coolant is in an insulating environment and improve the heat dissipation effect of the battery pack.

[0006] In one aspect, the present application provides a battery pack, comprising:

[0007] Battery pack housing;

[0008] An insulating cover, the insulating cover is arranged in the battery pack shell, the insulating cover has a sealed cavity, and the sealed cavity is filled with a coolant;

[0009] A battery module, at least two of which are arranged in sequence in the sealed cavity along a first direction and immersed in the coolant;

[0010] A high-voltage busbar is arranged in the battery pack shell and passes through the insulating cover. The high-voltage busbar is in close contact with the insulating cover and extends into the sealed cavity, and is used to connect two adjacent battery modules in series.

[0011] In some embodiments, the high voltage bus bar comprises:

[0012] A busbar body, wherein the busbar body has a first busbar portion and a second busbar portion;

[0013] A high-voltage output electrode is provided through and in close contact with the insulating cover, and a portion of the high-voltage output electrode is provided in the sealed cavity, wherein:

[0014] The first busbar and the second busbar are respectively connected to module output poles of two adjacent battery modules through the corresponding high-voltage output poles.

[0015] In some embodiments, the battery module comprises:

[0016] Battery cells, at least two of the battery cells are arranged in sequence to form a battery cell group, and at least two of the battery cell groups are arranged in sequence along a second direction perpendicular to the first direction;

[0017] A flexible circuit board, wherein the flexible circuit board is arranged above the battery cell group;

[0018] A busbar for a battery cell, wherein the upper end of the busbar for the battery cell is connected to the flexible circuit board via a first connecting piece, and one side of the busbar for the battery cell is connected to the pole of the battery cell via a second connecting piece.

[0019] In some embodiments, the battery cell group includes at least two battery cells arranged in sequence along the second direction, and the electrical properties of the poles at the same end of the two adjacent battery cells are opposite;

[0020] The second connecting piece comprises:

[0021] A U-shaped body connected to the battery cell busbar;

[0022] The two extension parts extend from the two opening ends of the U-shaped body in the direction away from the busbar for the battery cells, and the two extension parts are respectively connected to the poles at the same end of two adjacent battery cells.

[0023] In some embodiments, the flexible circuit board includes a main acquisition part and a sub-acquisition part connected to the main acquisition part, and the sub-acquisition part is used to collect temperature information and / or voltage information of the battery cell;

[0024] The battery pack shell is provided with a BDU and a low-voltage connection component that penetrates and is in close contact with the insulation, and the main acquisition unit is connected to the corresponding terminal of the BDU through the low-voltage connection component.

[0025] In some embodiments, the battery module includes a module housing and a fixing block connected to the module housing and protruding outwardly in a second direction perpendicular to the first direction;

[0026] The insulating cover also has an assembly cavity connected to the sealing cavity, and a plurality of the assembly cavities are arranged at intervals along the first direction. The fixing blocks are installed in the corresponding assembly cavities, the battery pack shell is provided with fixing columns, and the insulating cover and the fixing blocks are respectively provided with through holes for the fixing columns to pass through.

[0027] In some embodiments, at least two of the battery modules are arranged in sequence along the first direction to form a battery module assembly, and a battery positive electrode and a battery negative electrode are respectively provided at two ends of the battery module assembly along the first direction;

[0028] The battery pack shell is provided with a BDU and a high-voltage connection component that penetrates through and is in close contact with the insulating cover. The positive electrode of the battery and the negative electrode of the battery are respectively connected to corresponding terminals of the BDU through the high-voltage connection component.

[0029] In some of the embodiments, a connecting beam and a BMS are further provided in the battery pack housing, a high-voltage connector is provided on the connecting beam, and the high-voltage connector is connected to the BDU through the BMS.

[0030] In some embodiments, connecting side beams are respectively provided at both ends of the connecting cross beam along the first direction;

[0031] One of the connecting cross beam and the connecting side beam is provided with an L-shaped protrusion protruding outward, and the other of the two is provided with a groove for the L-shaped protrusion to be inserted and installed.

[0032] On the other hand, the present application also provides a battery pack, comprising any of the battery packs described above.

[0033] After adopting the above technical solution, the present application has the following beneficial effects compared with the prior art.

[0034] 1. In the battery pack of the present application, the battery module is arranged in a sealed cavity and immersed in a coolant. The coolant can fully contact the battery module, quickly take away the heat generated inside the battery pack, enhance the heat exchange efficiency of the battery pack, and at the same time ensure that the coolant is in an insulating environment, thereby improving the safety of the battery pack.

[0035] 2. In the battery pack of the present application, the battery modules are immersed in the coolant and the battery modules are connected in series through a high-voltage bus, which can not only achieve a stable output of high-voltage current, but also improve the heat dissipation effect of the battery pack, especially during high-power charging and generating processes, so that the battery pack can achieve excellent charging and discharging performance.

[0036] 3. The energy storage device in the present application includes the battery pack in the present application, and therefore also includes all the above-mentioned advantages of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the structure of a battery pack in an embodiment of the present application;

[0038] Figure 2 is a schematic structural diagram of a battery pack in an embodiment of the present application with the upper shell removed;

[0039] Figure 3 This is a front view of a battery pack in an embodiment of the present application with the upper shell removed;

[0040] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0041] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle;

[0042] Figure 6 is a schematic diagram of a battery module assembly in an embodiment of the present application with the insulating cover removed;

[0043] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle;

[0044] Figure 8 yes Figure 6 A partial enlarged view of point D in the middle;

[0045] Fig. 9 FIG. 1 is a schematic diagram of a battery module assembly from another angle in an embodiment of the present application with the insulating cover removed;

[0046] Fig.10 yes Fig. 9 A partial enlarged view of point E in the middle.

[0047] In the figure: 100, battery pack; 10, battery pack shell; 11, upper shell; 12, lower shell; 121, connecting crossbeam; 1211, L-shaped protrusion; 122, connecting side beam; 123, bottom guard plate; 124, plug-in block; 1241, plug-in slot; 20, battery module assembly; 21, battery module; 211, module shell; 2111, upper bracket; 2112, lower bracket; 2113, fixing plate; 2114, high and low voltage output plate; 2115, reinforcing rib; 212, fixing block; 2121, through hole; 213, battery cell group; 2131, battery cell; 214, flexible circuit board; 2141, main collection part; 2142, sub-collection part; 215, bus bar for battery cell; 216 , first connecting piece; 217, second connecting piece; 2171, U-shaped body; 2172, extension part; 218, module output pole; 2181, module output positive pole; 2182, module output negative pole; 2182, threaded hole; 22, insulating cover; 221, assembly part; 30, high-voltage bus; 31, bus body; 311, first bus; 312, second bus; 32, high-voltage output pole; 40, BDU; 41, copper bus; 50, BMS; 51, main control harness; 60, high-voltage connector; 61, fast charging high-voltage connector; 62, front drive high-voltage connector; 63, rear drive high-voltage connector; 70, vehicle low-voltage interface; 80, low-voltage connecting component; 90, fixing column. DETAILED DESCRIPTION

[0048] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] In the embodiment of the present application, a battery pack 100 is provided, which is applied to an energy storage device. The energy storage device may be a device with a battery replacement function such as a vehicle or an operating machine. For the specific structure of the battery pack 100, please refer to Figures 1 to 10 , which includes a battery pack shell 10, an insulating cover 22, a battery module 21 and a high-voltage bus 30, wherein the insulating cover 22 is arranged in the battery pack shell 10, and the insulating cover 22 has a sealed cavity, and the sealed cavity is filled with coolant; at least two battery modules 21 are arranged in sequence in the sealed cavity along a first direction and immersed in the coolant, and the insulating cover 22 and the battery modules 21 arranged therein form a battery module assembly 20; the high-voltage bus 30 is arranged in the battery pack shell 10 and penetrates the insulating cover 22, the high-voltage bus 30 is in close contact with the insulating cover 22 and extends into the sealed cavity, and is used to connect two adjacent battery modules 21 in series.

[0050] According to the battery pack 100 of the application, the battery module 21 is arranged in a sealed cavity and immersed in a coolant. The coolant can fully contact the battery module 21, quickly take away the heat generated inside the battery pack 100, and enhance the heat exchange efficiency of the battery pack 100. At the same time, the coolant is ensured to be in an insulating environment, thereby improving the safety of the battery pack 100. In addition, the battery modules 21 are connected in series through the high-voltage bus 30, which can not only realize the stable output of high-voltage current, but also enable the battery pack 100 to achieve excellent charging and discharging performance, especially during high-power charging and generating processes.

[0051] For the specific structure of the high-voltage busbar 30, please refer to Figures 3 to 5 , which includes a busbar body 31 and a high-voltage output pole 32, wherein the busbar body 31 has a first busbar portion 311 and a second busbar portion 312; the high-voltage output pole 32 is penetrated and in close contact with the insulating cover 22, and a portion of the high-voltage output pole 32 is arranged in the sealed cavity. Specifically, the first busbar portion 311 and the second busbar portion 312 are respectively connected to the module output poles 218 of two adjacent battery modules 21 through the corresponding high-voltage output poles 32, so that the first busbar portion 311 and the second busbar portion 312 are respectively connected to the module output positive pole 2181 of one of the two adjacent battery modules 21 and the module output negative pole 2182 of the other, so that the two adjacent battery modules 21 are connected in series, and it is ensured that the battery pack 100 can stably output high-voltage current.

[0052] The first conduit 311 and the second conduit 312 are respectively connected to the corresponding high-voltage output pole 32 through a connection structure (not shown in the figure). For example, the connection structure can be a stud, but not limited thereto. The first conduit 311 and the second conduit 312 and the connection structure can be formed into an integrated structure through a riveting process, such as Figure 6 and Figure 7 As shown, the module output pole 218 is provided with a threaded hole 2183 for the stud to pass through, so that the module output pole 218 is threadedly fastened with the stud, and the connection method is firm and suitable for industrial production and application.

[0053] like Figure 4 and Figure 5 As shown, the bus body 31 is U-shaped, and the ends of the first bus portion 311 and the second bus portion 312 are spaced apart. The first bus portion 311 and the second bus portion 312 are respectively connected to the corresponding high-voltage output poles 32 through a connecting structure. There is a safe distance between the two high-voltage output poles 32 to ensure safety and reduce heat transfer.

[0054] For the specific structure of the battery module 21, please refer to Figures 6 to 10, which includes a battery cell 2131, a flexible circuit board 214 and a bus bar 215 for the battery cells, wherein at least two battery cells 2131 are arranged in sequence to form a battery cell group 213, and at least two battery cell groups 213 are arranged in sequence along a second direction perpendicular to the first direction; the flexible circuit board 214 is arranged above the battery cell group 213; the upper end of the battery cell bus bar 215 is connected to the flexible circuit board 214 through a first connecting piece 216, and one side of the battery cell bus bar 215 is connected to the pole of the battery cell 2131 through a second connecting piece 217. By arranging a plurality of battery cell groups 213 in sequence, the battery pack 100 has a high energy density, and by arranging the flexible circuit board 214 and the bus bar 215 for the battery cells at different positions of the battery cell group 213, when the battery cell 2131 is charged and discharged, it is more conducive to the heat dissipation of the battery cell 2131, thereby improving the safety performance of the battery pack 100.

[0055] The first direction is substantially perpendicular to the height direction of the battery module assembly 20. The first direction may be substantially parallel to the length direction of the battery module assembly 20. Of course, the first direction may also be substantially parallel to the thickness direction of the battery module assembly 20. For ease of description, in this embodiment, the first direction is substantially parallel to the length direction of the battery module assembly 20, and the second direction is substantially parallel to the thickness direction of the battery module assembly 20.

[0056] like Figures 6 to 10 As shown, the battery cell group 213 includes at least two battery cells 2131 arranged in sequence along the second direction, and the poles at the same end of two adjacent battery cells 2131 have opposite electrical properties, so that the second connecting piece 217 is connected to the battery cell bus 215 to collect voltage signals.

[0057] For the specific structure of the second connecting piece 217, please refer to Figure 7 and Fig.10 It includes a U-shaped body 2171 and an extension portion 2172, wherein the U-shaped body 2171 is connected to the bus 215 for the battery cells; the two extension portions 2172 extend from the two open ends of the U-shaped body 2171 in the direction away from the bus 215 for the battery cells, respectively, and the two extension portions 2172 are respectively connected to the poles at the same end of two adjacent battery cells 2131. By setting a second connecting piece 217 in a "J" shape, the two extension portions 2172 can be welded to the poles at the same end of the two battery cells 2131, and the U-shaped body 2171 is fixed to the battery cells 2131 by bus welding, with good connection effect and convenient assembly. Exemplarily, the first connecting piece 216 and the second connecting piece 217 can be nickel sheets, but are not limited to this.

[0058] like Figures 6 to 10As shown, the flexible circuit board 214 includes a main collecting part 2141 and a sub-collecting part 2142 connected to the main collecting part 2141, and the sub-collecting part 2142 is used to collect temperature information and / or voltage information of the battery cell 2131. Exemplarily, the flexible circuit board 214 can be an FPC flexible circuit board 214. The FPC flexible circuit board 214 has the characteristics of high wiring density, light weight and thin thickness, but the flexible circuit board 214 is not limited to this.

[0059] like Figures 6 to 10 As shown, the main acquisition part 2141 is penetrated and closely connected with the insulating cover 22, and a part of the main acquisition part 2141 passes through the insulating cover 22 and is connected to the corresponding terminal of the BDU40 through the low-voltage connecting component 80, which can not only ensure that the coolant is in an insulating environment to avoid short circuit, but also realize the output of low-voltage signals, thereby realizing the transmission of working data of the battery cell 2131.

[0060] Preferably, the main collecting part 2141 and the sub-collecting part 2142 are detachably connected. By setting the sub-collecting part 2142 as a detachable structure, the sub-collecting part 2142 can be easily disassembled and assembled, thereby reducing production costs and improving maintenance efficiency.

[0061] like Figures 3 to 5 As shown, a BDU40 and a low-voltage connecting component 80 that penetrates and is tightly insulated are provided in the battery pack shell 10. The main acquisition unit 2141 is connected to the corresponding terminal of the BDU40 through the low-voltage connecting component 80 to achieve the output of the low-voltage signal, thereby realizing the transmission of the working data of the battery cell 2131.

[0062] like Figure 3 , Figure 6 and Figure 8 As shown, the battery module 21 includes a module shell 211 and a fixing block 212 connected to the module shell 211 and protruding outward in a second direction perpendicular to the first direction; the insulating cover 22 also has an assembly cavity connected to the sealed cavity, and a plurality of assembly cavities are arranged at intervals along the first direction. The fixing block 212 is loaded into the corresponding assembly cavity, and the battery pack shell 10 is provided with a fixing column 90. The insulating cover 22 and the fixing block 212 are respectively provided with through holes 2121 for the fixing column 90 to pass through. Exemplarily, both sides of the insulating cover 22 protrude outward to form an assembly portion 221, and a plurality of assembly cavities are formed inside the assembly portion 221, so that the insulating cover 22 and the battery module 21 are fixedly connected to the battery pack shell 10, thereby realizing the fixed connection between the battery module assembly 20 and the battery pack shell 10. In particular, the fixing block 212 of each battery module 21 is inserted into the corresponding assembly cavity, which has a good limiting effect on the battery module 21 and improves the stability of the battery module assembly 20.

[0063] For the specific structure of the module housing 211, please refer to Figures 6 to 10, which includes an upper bracket 2111, a lower bracket 2112, a fixing plate 2113 and a high and low voltage output plate 2114, wherein the shape of the fixing plate 2113 is adapted to the contour of the battery cell 2131, and is used to fix the battery cell 2131. Exemplarily, the battery cell 2131 can be a cylindrical battery cell 2131, and the side of the fixing plate 2113 is an arc structure. The fixing plate 2113 is coated on the outer surface of the cylindrical battery cell 2131, and the fixing effect is good; the high and low voltage output plate 2114 is arranged above the battery cell group 213, and the module output pole 218 and the main collection part 2141 are penetrated by the high and low voltage output plate 2114. The upper bracket 2111 is located between two adjacent battery modules 21, and plays the role of electrical isolation of the adjacent battery modules 21, thereby ensuring the safety of the battery pack 100; the battery cell bus 215 is isolated from the battery cell 2131 by the lower bracket 2112, thereby increasing the electrical safety distance.

[0064] like Figures 6 to 10 As shown, the fixing block 212 is arranged on the outside of the fixing plate 2113 and connected to the fixing plate 2113. The connection strength between the fixing plate 2113 and the fixing block 212 is enhanced by the reinforcing ribs 2115, and the reliability is high.

[0065] As an embodiment not shown, the upper bracket 2111 is formed with a first flange, and the lower bracket 2112 is formed with a second flange. The first flange and the second flange are arranged in close contact with each other to form a flange structure with a snap-fit ​​connection, which improves the sealing of the battery module 21 and realizes electrical isolation of adjacent battery modules 21.

[0066] like Figures 6 to 10 As shown, at least two battery modules 21 are arranged in sequence along a first direction to form a battery module assembly 20, and the battery module assembly 20 is respectively provided with a positive battery electrode and a negative battery electrode at both ends along the first direction. Exemplarily, the module output positive electrode 2181 of one of the battery modules 21 at both ends of the battery module assembly 20 along the first direction is the positive battery electrode, and the module output positive electrode 2181 of the other is the negative battery electrode; a BDU40 and a high-voltage connecting component that penetrates and is closely connected to an insulating cover 22 are provided in the battery pack shell 10, and the battery positive electrode and the battery negative electrode are respectively connected to the corresponding terminal of the BDU40 through the high-voltage connecting component to realize the output of high-voltage current, simplify the structure of the electrical connector and improve the assembly efficiency.

[0067] like Figure 3 As shown, the BDU 40 is connected to a corresponding wire harness or copper bus 41 , which are arranged on the same side of the insulating cover 22 , and the high-voltage connection component and the low-voltage connection component 80 are electrically connected to the wire harness or copper bus 41 of the BDU 40 , respectively.

[0068] like Figures 1 to 3As shown, a connecting beam 121 and a BMS50 are also provided in the battery pack shell 10. A high-voltage connector 60 is provided on the connecting beam 121. The high-voltage connector 60 is connected to the BDU40 through the BMS50 to achieve rapid charging and discharging of the battery pack 100 and maximize the performance of the battery pack 100.

[0069] like Figures 1 to 3 As shown, the BMS50 is correspondingly connected with a main control harness 51, which connects the high-voltage connector 60 and the BDU40, wherein two connecting beams 121 are arranged relatively along a first direction, and the high-voltage connector 60 includes a fast-charging high-voltage connector 61, a front-drive high-voltage connector 62 and a rear-drive high-voltage connector 63, the front-drive high-voltage connector 62 and the vehicle low-voltage interface 70 are fixed to the connecting beam 121 on the left, and the fast-charging high-voltage connector 61 is fixed to the connecting beam 121 on the right, so as to output high-voltage current to the energy storage device.

[0070] like Figures 1 to 3 As shown, connecting side beams 122 are respectively provided at both ends of the connecting crossbeam 121 along the first direction; one of the connecting crossbeam 121 and the connecting side beam 122 is provided with an L-shaped protrusion 1211 protruding outward, and the other of the two is provided with a groove for the L-shaped protrusion to be inserted and installed, thereby realizing a detachable connection between the connecting crossbeam 121 and the connecting side beam 122.

[0071] like Figures 1 to 3 As shown, a plug-in block 124 protruding and extending outward is provided on the connecting side beam 122, and a plug-in slot 1241 with an open end is formed on the plug-in block 124 for installing and fixing the battery pack 100 and the entire vehicle.

[0072] like Figure 1 As shown, the battery pack shell 10 includes an upper shell 11 and a lower shell 12 which are sealed and connected to each other, and a accommodating cavity is formed between the upper shell 11 and the lower shell 12, wherein the lower shell 12 includes a bottom guard plate 123 arranged at the bottom of the battery module assembly 20, and two connecting cross beams 121 and connecting side beams 122 are connected end to end in sequence to form a frame, the shape of the frame is adapted to the outer peripheral contour of the bottom guard plate 123 and is sealed and connected to the bottom guard plate 123, and the upper shell 11 is welded and fixed to the connecting cross beams and the side beams 122.

[0073] As an embodiment not shown, the bottom guard plate 123 is fixedly connected to the connecting side beams 122 and the connecting cross beam 121 by rivet nuts. The connection is firm and the assembly method is simple. In addition, the bottom guard plate 123 is provided with a sealing ring for sealing the bottom guard plate 123 with the connecting side beams 122 and the connecting cross beam 121 to ensure that the battery pack shell 10 has good sealing properties.

[0074] like Figure 3 , Figure 4 , Figure 6 and Figure 8 As shown, a fixing column 90 is arranged on the bottom guard plate 123, and a plurality of fixing columns 90 are arranged in sequence and spaced apart along the first direction. The insulating cover 22 and the fixing block 212 are respectively provided with through holes 2121 for the fixing columns 90 to pass through, so that the insulating cover 22 and the battery module 21 are fixedly connected to the bottom guard plate 123, thereby realizing a fixed connection between the battery module assembly 20 and the lower shell 12.

[0075] An energy storage device is also provided in an embodiment of the present application. The energy storage device may be a device with a battery replacement function such as a vehicle or an operating machine. The energy storage device includes the battery pack 100 in the above embodiment, which also includes all the advantages of the battery pack 100 and will not be repeated here.

[0076] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, or it can be connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0079] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery pack, characterized in that: include: Battery pack housing; An insulating cover, the insulating cover is arranged in the battery pack shell, the insulating cover has a sealed cavity, and the sealed cavity is filled with a coolant; A battery module, at least two of which are arranged in sequence in the sealed cavity along a first direction and immersed in the coolant; A high-voltage busbar is arranged in the battery pack shell and passes through the insulating cover. The high-voltage busbar is in close contact with the insulating cover and extends into the sealed cavity, and is used to connect two adjacent battery modules in series.

2. The battery pack according to claim 1, characterized in that: The high-voltage busbar comprises: A busbar body, wherein the busbar body has a first busbar portion and a second busbar portion; A high-voltage output electrode is provided through and in close contact with the insulating cover, and a portion of the high-voltage output electrode is provided in the sealed cavity, wherein: The first busbar and the second busbar are respectively connected to module output poles of two adjacent battery modules through the corresponding high-voltage output poles.

3. The battery pack according to claim 1, characterized in that: The battery module comprises: Battery cells, at least two of the battery cells are arranged in sequence to form a battery cell group, and at least two of the battery cell groups are arranged in sequence along a second direction perpendicular to the first direction; A flexible circuit board, wherein the flexible circuit board is arranged above the battery cell group; A busbar for a battery cell, wherein the upper end of the busbar for the battery cell is connected to the flexible circuit board via a first connecting piece, and one side of the busbar for the battery cell is connected to the pole of the battery cell via a second connecting piece.

4. The battery pack according to claim 3, characterized in that: The battery cell group comprises at least two battery cells arranged in sequence along the second direction, and the poles at the same end of two adjacent battery cells have opposite electrical properties; The second connecting piece comprises: A U-shaped body connected to the battery cell busbar; The two extension parts extend from the two opening ends of the U-shaped body in the direction away from the busbar for the battery cells, and the two extension parts are respectively connected to the poles at the same end of two adjacent battery cells.

5. The battery pack according to claim 3, characterized in that: The flexible circuit board includes a main collecting part and a sub-collecting part connected to the main collecting part, and the sub-collecting part is used to collect temperature information and / or voltage information of the battery cell; The battery pack shell is provided with a BDU and a low-voltage connection component that penetrates and is in close contact with the insulation, and the main acquisition unit is connected to the corresponding terminal of the BDU through the low-voltage connection component.

6. The battery pack according to claim 1, characterized in that: The battery module comprises a module shell and a fixing block connected to the module shell and protruding outwardly in a second direction perpendicular to the first direction; The insulating cover also has an assembly cavity connected to the sealing cavity, and a plurality of the assembly cavities are arranged at intervals along the first direction. The fixing blocks are installed in the corresponding assembly cavities, the battery pack shell is provided with fixing columns, and the insulating cover and the fixing blocks are respectively provided with through holes for the fixing columns to pass through.

7. The battery pack according to claim 1, characterized in that: At least two of the battery modules are arranged in sequence along the first direction to form a battery module assembly, and the two ends of the battery module assembly along the first direction are respectively provided with a battery positive electrode and a battery negative electrode; The battery pack shell is provided with a BDU and a high-voltage connection component that penetrates through and is in close contact with the insulating cover. The positive electrode of the battery and the negative electrode of the battery are respectively connected to corresponding terminals of the BDU through the high-voltage connection component.

8. The battery pack according to claim 7, characterized in that: A connecting crossbeam and a BMS are also provided in the battery pack shell. A high-voltage connector is provided on the connecting crossbeam, and the high-voltage connector is connected to the BDU through the BMS.

9. The battery pack according to claim 8, characterized in that: The two ends of the connecting crossbeam along the first direction are respectively provided with connecting side beams; One of the connecting cross beam and the connecting side beam is provided with an L-shaped protrusion protruding outward, and the other of the two is provided with a groove for the L-shaped protrusion to be inserted and installed.

10. An energy storage device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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