Battery packs and vehicles

Abstract

This invention provides a battery pack and a vehicle, relating to the field of power battery technology. The battery pack includes a top cover, a cell assembly, a first connecting piece, a second connecting piece, and a tray. The top cover and tray are respectively connected to the cell assembly, which includes multiple cell rows, each containing multiple cells. The side of the cell assembly connected to the top cover in the third-order direction is a plane. The vehicle includes the battery pack. The top cover, in the third-order direction, is fixedly connected not only to the tray but also to the plane of the cell assembly using structural adhesive. This improves the connection strength between the top cover and other parts of the battery pack, making it less prone to separation in the third-order direction, thereby improving occupant safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a battery pack and a vehicle. BACKGROUND

[0002] With the development of new energy vehicles, in order to further improve the safety and economy of the battery system, the conventional battery system has gradually begun to develop towards a structure that bears the vehicle body, and the battery upper cover plate is used as a vehicle body bearing structure. The CTC (Cell To Chasis) technology integrates a tray and a battery cell, reduces the intermediate link of mounting the battery cell to the vehicle body, reduces cost and weight, improves the cruising range, and major vehicle manufacturers and battery companies are actively involved in the development of this technology.

[0003] In related technologies, a CTC battery pack includes an upper cover plate, a battery cell, a connecting sheet, and a tray. The battery cell is arranged between the upper cover plate and the tray along the Z direction. The battery cell is provided with a pole at one end close to the upper cover plate in the Z direction. The connecting sheet is used to connect the poles of adjacent two battery cells. The upper cover plate and the tray are connected by structural glue. The upper cover plate of the CTC battery pack is combined with the passenger compartment floor of the vehicle, and the upper cover plate of the CTC battery pack seals the passenger compartment.

[0004] However, when the vehicle passes through the deceleration zone, the structure of the upper cover plate of the CTC battery pack as the passenger compartment floor is prone to separation between the upper cover plate and other parts of the CTC battery pack in the Z direction, thereby causing a problem of reduced passenger safety. SUMMARY

[0005] The present application provides a battery pack and a vehicle to solve the problem that when the vehicle passes through the deceleration zone, the structure of the upper cover plate of the CTC battery pack as the passenger compartment floor is prone to separation between the upper cover plate and other parts of the CTC battery pack in the Z direction, thereby causing a problem of reduced passenger safety.

[0006] In one aspect, the present application provides a battery pack, comprising an upper cover plate, a battery cell group, a first connecting sheet, a second connecting sheet, and a tray.

[0007] The upper cover plate and the tray are respectively connected with the battery cell group, the battery cell group comprises a plurality of battery cell rows, each battery cell row comprises a plurality of battery cells, the battery cell rows of the battery cell group are arranged side by side along a first direction, and the battery cells of each battery cell row are arranged in sequence along a second direction. Each battery cell is provided with a first pole and a second pole at both ends in the second direction.

[0008] The first pole and the second pole between adjacent battery cells of each battery cell row are connected with the first connecting sheet, and the second connecting sheet is connected between adjacent battery cell rows of the battery cell group.

[0009] The side of the electric cell group connected with the upper cover plate in the third direction is a plane, the upper cover plate is fixedly connected with the plane of the electric cell group and the tray through structural glue respectively, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction.

[0010] Optionally, the electric cell comprises a square electric cell body, the square electric cell body has a first plane, a second plane, a third plane, a fourth plane, a fifth plane and a sixth plane, the first plane and the second plane are arranged in parallel in the first direction, the third plane and the fourth plane are arranged perpendicularly between the first plane and the second plane, the fifth plane and the sixth plane are arranged perpendicularly between the first plane and the second plane, the third plane and the fourth plane are arranged in parallel in the second direction, and the fifth plane and the sixth plane are arranged in parallel in the third direction.

[0011] The side of the square electric cell body connected with the upper cover plate in the third direction is the fifth plane, the first pole is arranged on the third plane, and the second pole is arranged on the fourth plane.

[0012] Optionally, the first connecting piece comprises a first L-shaped body and a second L-shaped body, the first L-shaped body is connected with the first pole between adjacent electric cells of the electric cell row through welding, and the second L-shaped body is connected with the second pole between adjacent electric cells of the electric cell row through welding; or the first connecting piece is a long-circular hollow piece, and the side of the hollow piece is connected with the first pole and the second pole between adjacent electric cells of the electric cell row through welding.

[0013] Optionally, the second connecting piece is a square connecting plate, and the connecting plate is connected with the first pole and the second pole at the same end of adjacent electric cell rows in the second direction through welding.

[0014] Optionally, the tray comprises a bottom plate and a frame, the frame is arranged on the bottom plate, and the electric cell group is accommodated in a space formed by the bottom plate and the frame.

[0015] Optionally, a plurality of cooling plates are further included.

[0016] The cooling plates are arranged between adjacent cell rows of the cell group, and the cooling plates have liquid inlet channels and liquid outlet channels.

[0017] Each of the liquid inlet branches is communicated with a liquid inlet channel of one of the cooling plates after penetrating the frame body, and each of the liquid return branches is communicated with a liquid outlet channel of one of the cooling plates after penetrating the frame body.

[0018] Optionally, the battery pack further comprises a plurality of cooling plates.

[0019] The cooling plates are arranged between adjacent cell rows of the cell group, and the cooling plates have cooling channels.

[0020] The frame is provided with a liquid inlet connector and a liquid outlet connector, the liquid inlet connector is communicated with the liquid inlet cavity, and the liquid outlet connector is communicated with the liquid return cavity.

[0021] Optionally, the battery pack further comprises a plurality of cooling plates.

[0022] The bottom plate is provided with a first smoke exhaust channel and a plurality of through holes, each of the explosion-proof valves corresponds to one of the through holes, and the first smoke exhaust channel is communicated with each of the through holes.

[0023] The frame is provided with a second smoke exhaust channel and a pressure relief port inside, one end of the second smoke exhaust channel is communicated with the first smoke exhaust channel, and the other end of the second smoke exhaust channel is communicated with the pressure relief port.

[0024] Optionally, the battery pack further comprises a BDU, and the BDU comprises a BDU body and a connecting plug, the BDU body is detachably fixed to the outside of the frame, and the connecting plug is fixed to the inside of the frame.

[0025] The BDU body is provided with an electrical vulnerable element, the connecting plug is provided with three pins, and the three pins are connected with the BDU body through the frame.

[0026] In another aspect, the application provides a vehicle comprising the battery pack as described above.

[0027] The application provides a battery pack and a vehicle, the upper cover plate is fixedly connected with the tray and the plane of the battery cell group in the third direction through structural glue, the connection strength between the upper cover plate and other parts of the battery pack is improved, separation between the upper cover plate and other parts of the battery pack in the third direction is not prone to occur, and thus the safety of passengers is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor under the premise of the drawings.

[0029] Figure 1 The structure of the battery pack provided in the embodiment one Figure 1

[0030] Figure 2 The structure of the battery pack in the embodiment one Figure 1 Figure 2

[0031] Figure 3 The structure of the battery pack in the embodiment one Figure 1 Figure 1

[0032] Figure 4 The structure of the battery cell group in the embodiment one Figure 3

[0033] Figure 5 The connection of the adjacent battery cell rows in the embodiment one Figure 4

[0034] The structure of the battery cell provided in the embodiment one Figure 6 Figure 1

[0035] Figure 7 The structure of the battery cell in the embodiment one Figure 6 Figure 2

[0036] Figure 8 The connection of the adjacent battery cells of the battery cell row in the embodiment one Figure 4

[0037] The A-A part sectional view in the embodiment one Figure 9 Figure 2 The part of the battery pack in the embodiment one

[0038] Figure 10 Figure 2 The part of the battery pack in the embodiment one​​​​​​​​​​​​

[0039] Figure 11 Fig. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application; Figure 10

[0040] Figure 12 Fig. 2 is a structural schematic diagram of a frame body and a bottom plate in the battery pack of Fig. 1; Figure 10 Figure 1

[0041] Figure 13 Fig. 3 is a structural schematic diagram of a frame body and a bottom plate in the battery pack of Fig. 1; Figure 10 Figure 2

[0042] Figure 14 Fig. 4 is a sectional view of a B-B portion in the battery pack of Fig. 1; Figure 13

[0043] Figure 15 Fig. 5 is a sectional view of a C-C portion in the battery pack of Fig. 1; Figure 13

[0044] Figure 16 Fig. 6 is a structural schematic diagram of a cooling plate in the battery pack of Fig. 1; Figure 10

[0045] Figure 1 Fig. 7 is a partial schematic diagram of a battery pack in the battery pack of Fig. 1; Figure 2 Figure 1

[0046] Figure 2 Fig. 8 is a schematic diagram of connection of adjacent battery cells in a battery cell row provided by an embodiment two of the present application;

[0047] Figure 3 Fig. 9 is a schematic diagram of a battery pack provided by an embodiment three of the present application;

[0048] Figure 1 Fig. 10 is a partial schematic diagram of a battery pack in the battery pack of Fig. 1. Figure 1 BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 10 - upper cover plate; 20 - battery cell group; 21 - battery cell row; 211 - battery cell; 2111 - first pole; 2112 - second pole; 2113 - first plane; 2114 - second plane; 2115 - third plane; 2116 - fourth plane; 2117 - fifth plane; 2118 - sixth plane; 2119 - explosion-proof valve; 31 - first connecting plate; 311 - first L-shaped body; 312 - second L-shaped body; 32 - second connecting plate;

[0050]

[0051] ​​​​​​​​​​​40 - tray; 41 - bottom plate; 411 - first smoke exhaust channel; 4111 - top wall; 4112 - bottom wall; 4113 - reinforcing rib; 4114 - first reinforcing plate; 4115 - second reinforcing plate; 412 - through hole; 42 - frame; 421 - second smoke exhaust channel; 422 - pressure relief port; 4231 - first through hole; 4232 - second through hole; 43 - collecting pipe plate; 431 - liquid inlet cavity; 432 - collecting cavity; 433 - liquid inlet connector; 434 - liquid outlet connector; 435 - liquid inlet branch pipe; 436 - liquid return branch pipe; 44 - surrounding barrier plate; 441 - left end beam; 442 - right end beam; 443 - front end beam; 4441 - insulating hole; 444 - rear end beam; 50 - cooling plate; 501 - liquid inlet channel; 502 - liquid outlet channel; 503 - end plane; 504 - cooling channel; 60 - BDU; 61 - BDU main body; 62 - connecting plug; 621 - plug pin. DETAILED DESCRIPTION

[0052] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0053] It should be noted that the terms "first", "second" are used only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0054] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0056] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0057] In the related art, a CTC battery pack includes an upper cover plate, a cell, a connecting sheet and a tray, a plurality of cells are arranged between the upper cover plate and the tray, the cells are arranged along the Z direction, and a pole is arranged at one end of the cell close to the upper cover plate in the Z direction. The connecting sheet is used to connect the poles of the adjacent two cells, and the upper cover plate and the tray are connected by structural glue. The upper cover plate of the CTC battery pack is combined with the passenger compartment floor of the vehicle, and the upper cover plate of the CTC battery pack seals the passenger compartment.

[0058] However, the structure of the upper cover plate of the CTC battery pack as the passenger compartment floor, due to the small area of the connection between the upper cover plate and the tray, the connection strength between the upper cover plate and the insulating block is small, and during the process of the vehicle passing through the deceleration belt, the separation between the upper cover plate and other parts of the CTC battery pack in the Z direction is easy, thereby the problem of reducing the safety of the passengers. In addition, the upper cover plate may be deformed in the Z direction due to the load, and the upper cover plate is generally a metal piece. The deformation leads to the reduction of the gap between the cell and the upper cover plate, thereby the problem of reducing the insulation of the CTC battery pack.

[0059] To solve the above problems, the application provides a battery pack and a vehicle, the pole of the battery cell group is no longer located in the third direction, so that the plane of the side surface of the battery cell group faces the upper cover plate, the upper cover plate is fixedly connected with the tray and the plane of the battery cell group in the third direction through structural glue, the connection strength between the upper cover plate and other parts of the battery pack is improved, the separation between the upper cover plate and other parts of the battery pack in the third direction is not easy to occur, and thus the passenger safety is improved. In addition, since the pole is not arranged on the side surface of the battery cell group facing the upper cover plate, the battery cell group can support the upper cover plate, the upper cover plate is not easy to deform, and the upper cover plate cannot contact the pole of the battery cell group in the third direction, and thus the insulation of the battery pack is improved. It should be noted that the Z direction in the related art is the third direction of the application.

[0060] The battery pack and the vehicle provided by the application will be described in detail below in combination with specific embodiments.

[0061] Figure 3 The structure of the battery pack provided by the first embodiment of the application is shown in Figure 4 ; Figure 5 The structure of the battery pack provided by the first embodiment of the application is shown in Figure 4 ; Figure 6 The structure of the battery pack provided by the first embodiment of the application is shown in Figure 1 , Figure 7 The upper cover plate 10 is not shown in Figure 6 , Figure 2 The structure of the battery cell group in Figure 8 The battery cell row 21 in Figure 4 includes four battery cells 211. Figures 1 to 8 The connection between adjacent battery cell rows in Figure 1 The structure of the battery cell provided by the first embodiment is shown in Figure 3 ; Figure 4 The structure of the battery cell provided by the first embodiment is shown in Figure 6 ; Figure 3 The structure of the battery cell provided by the first embodiment is shown in Figure 5 ; Figure 8 The connection between adjacent battery cells of the battery cell row in Figure 6 . Figure 7 The connection between adjacent battery cells of the battery cell row in

[0062] As shown in Figure 8 , the application provides a battery pack, which includes an upper cover plate 10, a battery cell group 20, a first connecting sheet 31, a second connecting sheet 32 and a tray 40.

[0063] As shown in Figure 18 , Figure 18 , Figure 5 and Figure 9As shown, the upper cover plate 10 and the tray 40 are connected with the battery cell group 20 respectively, the battery cell group 20 includes a plurality of battery cell rows 21, the battery cell row 21 includes a plurality of battery cells 211, the battery cell rows 21 of the battery cell group 20 are arranged side by side along the first direction Y in turn, the battery cells 211 of the battery cell row 21 are arranged along the second direction X in turn, and the two ends of the battery cell 211 in the second direction X are provided with the first pole 2111 and the second pole 2112. The side of the battery cell group 20 connected with the upper cover plate 10 in the third direction Z is a plane, and the upper cover plate 10 is fixedly connected with the plane of the battery cell group and the tray 40 respectively through structural glue.

[0064] Among them, the first direction Y is perpendicular to the second direction X, and the third direction Z is perpendicular to the first direction Y and the second direction X. Specifically, the first direction Y in embodiment one can be the left-right direction of the vehicle body when the battery pack is installed in the vehicle body; the second direction X in embodiment one can be the front-rear direction of the vehicle body when the battery pack is installed in the vehicle body; and the third direction Z in embodiment one can be the up-down direction of the vehicle body when the battery pack is installed in the vehicle body.

[0065] As shown in Figure 2 , Figure 9 and Figure 9 , the first connecting sheet 31 is connected between the first pole 2111 and the second pole 2112 between the adjacent battery cells 211 of the battery cell row 21, and the second connecting sheet 32 is connected between the adjacent battery cell rows 21 of the battery cell group 20. Specifically, since the battery cells 211 of the battery cell row 21 extend along the second direction X, in the second direction X, the first pole 2111 and the second pole 2112 of the adjacent battery cells 211 are correspondingly arranged, and the first pole 2111 and the second pole 2112 between the adjacent battery cells 211 are electrically connected through the first connecting sheet 31, so that the battery cells 211 of the battery cell row 21 can be connected in series; since the battery cell rows 21 of the battery cell group 20 are arranged side by side in the first direction Y, the first pole 2111 of one of the two battery cells 211 at the same end of the adjacent battery cell rows 21 in the second direction X is correspondingly arranged with the second pole 2112 of the other battery cell 211, and the first pole 2111 of one of the two battery cells 211 at the same end is electrically connected with the second pole 2112 of the other battery cell 211 through the second connecting sheet 32, so that the battery cell rows 21 of the battery cell group 20 can be connected in series.

[0066] The battery cell 211 can be a ternary lithium battery cell. In other ways, the battery cell 211 can also be a battery cell of other materials.

[0067] The upper cover plate 10 is integrated with the passenger compartment floor of the vehicle, that is, the upper cover plate 10 and the passenger compartment floor of the vehicle are the same component. Specifically, the upper cover plate 10 can be regarded as the passenger compartment floor of the vehicle, and the passenger compartment floor of the vehicle can be the upper cover plate 10.

[0068] The battery pack provided by the embodiment of the present application is fixedly connected with the tray 40 and the plane of the battery cell group 20 in the third direction Z through the structural adhesive, the connection strength between the upper cover plate 10 and other parts of the battery pack is improved, the separation between the upper cover plate 10 and other parts of the battery pack in the third direction Z is difficult to occur, and thus the passenger safety is improved. In addition, the first and second polar columns 2111 and 2112 in the battery cell 211 are no longer located in the third direction Z, the upper cover plate 10 can be supported through the battery cell group 20, the deformation of the upper cover plate 10 is difficult to occur, and the upper cover plate 10 is impossible to contact the first and second polar columns 2111 and 2112 of the battery cell group 20 in the third direction Z, and thus the insulation of the battery pack is improved.

[0069] Optionally, as shown in Figure 10 and Figure 2 , the battery cell 211 includes a square battery cell body, the square battery cell body has a first plane 2113, a second plane 2114, a third plane 2115, a fourth plane 2116, a fifth plane 2117 and a sixth plane 2118, the first plane 2113 and the second plane 2114 are arranged in parallel with respect to each other in the first direction Y, the third plane 2115 and the fourth plane 2116 are arranged perpendicularly between the first plane 2113 and the second plane 2114, the fifth plane 2117 and the sixth plane 2118 are arranged perpendicularly between the first plane 2113 and the second plane 2114, the third plane 2115 and the fourth plane 2116 are arranged in parallel with respect to each other in the second direction X, and the fifth plane 2117 and the sixth plane 2118 are arranged in parallel with respect to each other in the third direction Z.

[0070] The square battery cell body is connected with the upper cover plate 10 on one side in the third direction Z, and the fifth plane 2117, the first polar column 2111 is arranged on the third plane 2115, and the second polar column 2112 is arranged on the fourth plane 2116.

[0071] The fifth plane 2117 of the square battery cell body is fixedly connected with the upper cover plate 10 through the structural adhesive.

[0072] The fifth plane 2117 of the square battery cell body of all the battery cells 211 of the battery cell group 20 is fixedly connected with the upper cover plate 10 through the structural adhesive.

[0073] Optionally, as shown in Figure 2 , the first connecting sheet 31 can include a first L-shaped body 311 and a second L-shaped body 312, the first L-shaped body 311 is connected with the first polar column 2111 between the adjacent battery cells 211 of the battery cell row 21 through welding, and the second L-shaped body 312 is connected with the second polar column 2112 between the adjacent battery cells 211 of the battery cell row 21 through welding.

[0074] The first L-shaped main body 311 and the second L-shaped main body 312 are overlapped and then connected by welding.

[0075] Figure 11 This is a schematic diagram of the connection between adjacent cells in a cell array provided in Embodiment 2 of the present invention.

[0076] Optionally, such as Figure 10 As shown, the first connecting piece 31 can be an oblong hollow piece, and the side of the hollow piece is connected to the first pole 2111 and the second pole 2112 between the adjacent cells 211 of the cell array 21 by welding.

[0077] Among them, the first terminal 2111 and the second terminal 2112 between adjacent cells 211 of the cell array 21 are connected by hollow plates, which can not only reduce the weight of the battery pack, but also absorb energy through the hollow plates after the cell group 20 is hit.

[0078] Optionally, such as Figure 12 As shown, the second connecting piece 32 can be a square connecting plate, and the connecting plate is connected to the first pole 2111 and the second pole 2112 of the two cells 211 at the same end of the adjacent cell array 21 in the second direction X by welding.

[0079] In this process, the first terminal 2111 of one of the two cells 211 at the same end of the adjacent cell array 21 is electrically connected to the second terminal 2112 of the other cell 211 through a connecting plate, thereby connecting the cell arrays 21 of the cell group 20 in series.

[0080] Figure 10 for Figure 1 Sectional view of part AA in the middle. Figure 13 The upper cover 10 is not shown in the image. Figure 10 The line indicated by the arrow in the image has the inlet channel 501 above it and the outlet channel 502 below it. Figure 2 for Figure 14 A partial schematic diagram of the battery pack. Figure 13 The tray, cooling plate 50, and BDU60 are shown in the diagram; Figure 15 for Figure 13 A schematic diagram of the structure of the central piping board; Figure 16 for Figure 10 Schematic diagram of the frame body and base plate in the middle Figure 1 ; Figure 2 for Figure 4 Schematic diagram of the frame body and base plate in the middle Figure 10 ; Figure 9 for Figure 9 Sectional view of BB section in the middle; Figure 10 for Figure 16 Sectional view of the CC portion; Figure 12For Figure 13 a structural diagram of the cooling plate in the battery pack.

[0081] Optionally, as shown in Figure 19 and Figure 20 , the tray 40 includes a bottom plate 41 and a frame 42, the frame 42 is arranged on the bottom plate 41, the cell group 20 is accommodated in the space surrounded by the bottom plate 41 and the frame 42, and the upper cover plate 10 is arranged on the frame 42.

[0082] Among them, as shown in Figure 19 and Figure 20 , the battery pack further includes a plurality of cooling plates 50, and one cooling plate 50 is arranged between adjacent cell rows 21.

[0083] As shown in Figure 19 , the frame 42 is provided with a liquid inlet cavity 431 and a liquid flow cavity 432, the liquid inlet cavity 431 is used for conveying cooling liquid to the plurality of cooling plates 50, and the liquid flow cavity 432 is used for converging the cooling liquid flowing back in the plurality of cooling plates 50. By arranging the liquid inlet cavity 431 and the liquid flow cavity 432 in this way, the delivery water pipe and the backflow converging water pipe arranged on the inner side of the frame 42 can be abandoned, so that the volume of the cell group 20 can be increased, and the power volume utilization rate of the battery pack can be improved.

[0084] Optionally, as shown in Figure 6 , Figure 7 and Figure 13 , the cooling plate 50 has a liquid inlet passage 501 and a liquid outlet passage 502, the frame 42 includes a frame body and a summary pipe plate 43, the summary pipe plate 43 is located on the outer side of the frame body, the summary pipe plate 43 has the liquid inlet cavity 431 and the liquid flow cavity 432, the summary pipe plate 43 is provided with one liquid inlet connector 433, one liquid outlet connector 434, a plurality of liquid inlet branch pipes 435 and a plurality of liquid return branch pipes 436, the liquid inlet connector 433 and the plurality of liquid inlet branch pipes 435 are respectively communicated with the liquid inlet cavity 431, the liquid outlet connector 434 and the plurality of liquid return branch pipes 436 are respectively communicated with the liquid flow cavity 432; each liquid inlet branch pipe 435 is communicated with the liquid inlet passage 501 of one cooling plate 50 after penetrating the frame body, and each liquid return branch pipe 436 is communicated with the liquid outlet passage 502 of one cooling plate 50 after penetrating the frame body.

[0085] Specifically, as shown in Figure 14 , the frame body is provided with a left end beam 441 and a right end beam 442 in the first direction Y, and is provided with a front end beam 443 and a rear end beam 444 in the second direction X, the left end beam 441, the right end beam 442, the front end beam 443 and the rear end beam 444 are connected in sequence, and the summary pipe plate 43 is fixedly connected with the front end beam 443.

[0086] The summary pipe plate 43 and the front end beam 443 can be fixedly connected through structural glue.

[0087] AsFigure 15 As shown, the front end beam 443 is provided with a first through hole 4231 for the liquid inlet branch pipe 435 to pass through and a second through hole 4232 for the liquid return branch pipe 436 to pass through.

[0088] The liquid inlet branch pipe 435 and the front end beam 443 and the liquid return branch pipe 436 and the front end beam 443 are both provided with sealing glue or a sealing ring. Specifically, the liquid inlet branch pipe 435 and the plane of the front end beam 443 away from the cooling plate 50 and the liquid return branch pipe 436 and the plane of the front end beam 443 away from the cooling plate 50 are provided with sealing glue or a sealing ring. In this way, the overall sealing performance of the battery pack can be improved.

[0089] The liquid inlet branch pipe 435 and the cooling plate 50 and the liquid return branch pipe 436 and the cooling plate 50 are both provided with sealing glue. Specifically, the cooling plate 50 has an end plane 503, the liquid inlet branch pipe 435 and the liquid return branch pipe 436 abut against the end plane 503 after passing through the frame body, and the liquid inlet branch pipe 435 and the end plane 503 and the liquid return branch pipe 436 and the end plane 503 are both provided with sealing glue. In this way, the sealing performance between the liquid inlet branch pipe 435 and the end plane 503 and the sealing performance between the liquid return branch pipe 436 and the end plane 503 can be improved, so that the problem of liquid leakage between the liquid inlet branch pipe 435 and the cooling plate 50 and the liquid return branch pipe 436 and the cooling plate 50 can be avoided.

[0090] The liquid inlet channel 501 and the liquid outlet channel 502 are arranged in parallel along the extension direction of the cooling plate 50. In the extension direction of the cooling plate 50, one end of the liquid inlet channel 501 and the liquid outlet channel 502 penetrates the same end of the cooling plate 50, and the other end of the liquid inlet channel 501 and the liquid outlet channel 502 is connected. It should be noted that the liquid inlet channel 501 and the liquid outlet channel 502 only penetrate one end of the cooling plate 50.

[0091] The cooling liquid flow process is as follows: the cooling liquid first enters the liquid inlet cavity 431 from the liquid inlet connector 433, and then the cooling liquid flows into each liquid inlet branch pipe 435 through the liquid inlet cavity 431. The cooling liquid of each liquid inlet branch pipe 435 is transported through the liquid inlet channel 501 of the corresponding cooling plate 50, and then flows back to the liquid return branch pipe 436 through the liquid outlet channel 502. The cooling liquid of each liquid return branch pipe 436 converges in the liquid return cavity 432, and the cooling liquid in the liquid return cavity 432 flows out through the liquid outlet connector 434.

[0092] Figure 15 A schematic diagram of a battery pack provided for Embodiment Three of the present application; Figure 17 A schematic diagram of a battery pack provided for Embodiment Three of the present application; Figure 1 A schematic diagram of a battery pack provided for Embodiment Three of the present application; Figure 2The arrow in the figure represents the flow direction of the cooling liquid. It should be noted that the first direction Y in Example Three can be the front-rear direction of the vehicle body when the battery pack is installed in the vehicle body; the second direction X in Example Three can be the left-right direction of the vehicle body when the battery pack is installed in the vehicle body; and the third direction Z in Example Three can be the up-down direction of the vehicle body when the battery pack is installed in the vehicle body.

[0093] Optionally, as shown in FIG. 20, the cooling plate 50 has a cooling channel 504, the frame 42 has a liquid inlet cavity 431 and a liquid outlet cavity 432, the liquid inlet cavity 431 is provided with a plurality of liquid inlet branch pipes 435 between one end of the cooling channel 504 of the plurality of cooling plates 50, and the liquid outlet cavity 432 is provided with a plurality of liquid return branch pipes 436 at the other end of the cooling channel 504 of the plurality of cooling plates 50. Figure 1

[0094] The frame 42 is provided with one liquid inlet connector 433 and one liquid outlet connector 434, the liquid inlet connector 433 is in communication with the liquid inlet cavity 431, and the liquid outlet connector 434 is in communication with the liquid outlet cavity 432.

[0095] The cooling plate 50 is provided with at least one cooling channel 504. In an optional embodiment, the cooling plate 50 is provided with a plurality of cooling channels 504, and the plurality of cooling channels 504 all extend along the second direction X, and each cooling plate 50 corresponds to one liquid inlet branch pipe 435 and one liquid return branch pipe 436.

[0096] The cooling channel 504 penetrates both ends of the cooling plate 50 in the extension direction of the cooling plate 50. The liquid inlet branch pipe 435 and the liquid return branch pipe 436 are located at both ends of the cooling channel 504.

[0097] The frame 42 includes a frame body and a surrounding plate 44, the frame body is provided with a left end beam 441 and a right end beam 442 in the second direction X, and is provided with a front end beam 443 and a rear end beam 444 in the first direction Y, and the left end beam 441, the right end beam 442, the front end beam 443 and the rear end beam 444 are connected in sequence.

[0098] The liquid inlet connector 433 and the liquid outlet connector 434 are arranged on the outer side of the front end beam 443, the right end beam 442 is provided with a first through hole 4231 for the liquid inlet branch pipe 435 to pass through, and the left end beam 441 is provided with a second through hole 4232 for the liquid return branch pipe 436 to pass through.

[0099] ​The enclosing plate 44 is arranged outside the frame body, and the enclosing plate 44 and the frame body can be connected by welding or adhesion. The enclosing plate 44 and part of the front end beam 443 and the right end beam 442 enclose the liquid inlet cavity 431; the enclosing plate 44 and part of the front end beam 443 and the left end beam 441 enclose the liquid return cavity 432. The part of the liquid inlet cavity 431 in the front end beam 443 is not communicated with the part of the liquid return cavity 432 in the front end beam 443.

[0100] The liquid inlet branch pipe 435 and the front end beam 443 and the liquid return branch pipe 436 and the rear end beam 444 are provided with sealing glue or a sealing ring. Specifically, the liquid inlet branch pipe 435 and the plane of the right end beam 442 away from the cooling plate 50, and the liquid return branch pipe 436 and the plane of the left end beam 441 away from the cooling plate 50 are provided with sealing glue or a sealing ring. In this way, the sealing performance of the whole battery pack can be improved.

[0101] The liquid inlet branch pipe 435 and the cooling plate 50 and the liquid return branch pipe 436 and the cooling plate 50 are provided with sealing glue. Specifically, the cooling plate 50 has an end plane 503, the liquid inlet branch pipe 435 abuts against the end plane 503 after passing through the right end beam 442, the liquid return branch pipe 436 abuts against the end plane 503 after passing through the left end beam 441, and the liquid inlet branch pipe 435 and the end plane 503 and the liquid return branch pipe 436 and the end plane 503 are provided with sealing glue. In this way, the sealing performance between the liquid inlet branch pipe 435 and the end plane 503 and between the liquid return branch pipe 436 and the end plane 503 can be improved, so that the problem of liquid leakage between the liquid inlet branch pipe 435 and the cooling plate 50 and between the liquid return branch pipe 436 and the cooling plate 50 can be avoided. It should be noted that the two ends of the cooling plate 50 in the embodiment have end planes 503.

[0102] The cooling liquid flow process is as follows: the cooling liquid first enters the liquid inlet cavity 431 from the liquid inlet connector 433, then the cooling liquid flows into each liquid inlet branch pipe 435 through the liquid inlet cavity 431, the cooling liquid of each liquid inlet branch pipe 435 is transported through the cooling channel 504 of the corresponding cooling plate 50, then the cooling liquid flows back to the liquid return branch pipe 436 through the cooling channel 504, the cooling liquid of each liquid return branch pipe 436 converges in the liquid return cavity 432, and the cooling liquid in the liquid return cavity 432 flows out through the liquid outlet connector 434.

[0103] Optionally, the liquid inlet branch pipe 435 and the liquid return branch pipe 436 are elastic energy absorption pipes. In this way, when the liquid inlet branch pipe 435 is installed into the first through hole 4231 and the liquid return branch pipe 436 is installed into the first through hole 4231, the tolerance caused by manufacturing or assembly can be absorbed.

[0104] Optionally, as shown in FIG. 6, the liquid inlet branch pipe 435 and the liquid return branch pipe 436 are provided with a plurality of elastic energy absorption pipes 4351 and 4361. In this way, the tolerance caused by manufacturing or assembly can be absorbed. Figure 17 ,Figure 1 、 Figure 17 、 ​ and ​ As shown in FIG. 11, the battery cell 211 is provided with an explosion-proof valve 2119 on the side connected to the bottom plate 41 in the third direction Z; the bottom plate 41 is provided with a first smoke exhaust channel 411 and a plurality of through holes 412, each explosion-proof valve 2119 corresponds to one through hole 412, and the first smoke exhaust channel 411 is in communication with each through hole 412; the frame 42 is provided with a second smoke exhaust channel 421 and a pressure relief port 422, one end of the second smoke exhaust channel 421 is in communication with the first smoke exhaust channel 411, and the other end of the second smoke exhaust channel 421 is in communication with the pressure relief port 422.

[0105] The explosion-proof valve 2119 can cut off the current loop when the internal pressure of the battery cell 211 is high. The explosion-proof valve 2119 can also release the pressure inside the battery cell 211 by being damaged when the internal pressure of the battery cell 211 is high.

[0106] The bottom plate 41 is provided with at least one first smoke exhaust channel 411. In some examples, the bottom plate 41 is provided with a plurality of first smoke exhaust channels 411, the first smoke exhaust channels 411 extend along the first direction Y, and the number of first smoke exhaust channels 411 is equal to the number of battery cells 211 in the battery cell row 21.

[0107] The first smoke exhaust channel 411 can be a trapezoidal channel. In other ways, the first smoke exhaust channel 411 can also be a channel of other shapes.

[0108] The second smoke exhaust channel 421 is formed by a cavity inside the frame 42.

[0109] In an alternative embodiment, the frame 42 includes a frame body, the frame body is provided with a left end beam 441 and a right end beam 442 in the first direction Y, and the frame body is provided with a front end beam 443 and a rear end beam 444 in the second direction X, the left end beam 441, the right end beam 442, the front end beam 443 and the rear end beam 444 are connected in sequence. The second smoke exhaust channel 421 is located inside the rear end beam 444, the left end beam 441 and the right end beam 442, and the pressure relief port 422 is arranged on the rear end beam 444.

[0110] When the battery pack is in thermal runaway, harmful substances can be directly sprayed into the first smoke exhaust channel 411, and then discharged out of the battery pack through the second smoke exhaust channel 421 and the pressure relief port 422, avoiding the harmful substances being directly sprayed towards the passenger compartment, and effectively reducing the spread speed of heat diffusion, thereby improving the safety performance of the battery pack.

[0111] It should be noted that a sealant is arranged between the periphery of each explosion-proof valve 2119 and the bottom plate 41, and the through hole 412 is located within the range surrounded by the sealant, so that when the battery pack is in thermal runaway, harmful substances are sprayed into the first smoke exhaust channel 411 through the through hole 412.

[0112] Optionally, as shown in ​ , the first smoke exhaust channel 411 has a top wall 4111 and a bottom wall 4112 in the third direction Z, and the through hole 412 is located on the top wall 4111.

[0113] Among them, the first smoke exhaust channel 411 is provided with a reinforcing rib 4113, and the reinforcing rib 4113 is arranged on the top wall 4111. When the bottom of the battery pack is impacted, the reinforcing rib 4113 supports the bottom wall 4112 of the first smoke exhaust channel 411, which can improve the mechanical strength of the bottom plate 41.

[0114] The number of reinforcing ribs 4113 is at least one. In some examples, the number of reinforcing ribs 4113 is two.

[0115] In an optional embodiment, the reinforcing rib 4113 includes a first reinforcing plate 4114 and a second reinforcing plate 4115, the first reinforcing plate 4114 and the second reinforcing plate 4115 are arranged vertically, and the first reinforcing plate 4114 is fixedly connected with the top wall 4111.

[0116] Further, a gap is arranged between the second reinforcing plate 4115 and the bottom wall 4112. In this way, when the bottom of the battery pack is impacted, the bottom wall 4112 of the first smoke exhaust channel 411 deforms and abuts against the reinforcing rib 4113, and the reinforcing rib 4113 supports the bottom wall 4112 of the first smoke exhaust channel 411, thereby absorbing a certain amount of collision energy.

[0117] ​ For ​ , part of the battery pack is shown ​ .

[0118] Optionally, as shown in ​ and ​ , the battery includes a battery pack disconnect unit (BDU) 60, and the BDU 60 includes a BDU main body 61 and a connecting plug 62. The BDU main body 61 is detachably fixed outside the frame 42, and the connecting plug 62 is fixed inside the frame 42.

[0119] Among them, the BDU main body 61 is provided with an electrical vulnerable element. The BDU main body 61 and the frame 42 can be fixed by adhesion or bolted, which is not set here. The electrical vulnerable element includes a relay, a fuse, a sensor and other vulnerable electrical devices.

[0120] There is no electrical fragile element in the connection plug 62, but some electrical elements which are not easy to be damaged can be arranged in the connection plug 62. The connection plug 62 and the frame 42 can be fixed by bonding or by bolts, which is not set here.

[0121] The connection plug 62 is used to connect the battery cell group 20 and the BDU main body 61. Specifically, the connection plug 62 is provided with three pins 621, and the three pins 621 pass through the frame 42 and are connected with the BDU main body 61.

[0122] The three pins 621 are connected with the BDU main body 61 in both electrical connection and communication connection. Specifically, two pins 621 are connected with the BDU main body 61 in electrical connection, and one pin 621 is connected with the BDU main body 61 in communication connection.

[0123] When the electrical fragile element in the BDU 60 is repaired and replaced, only the BDU main body 61 needs to be installed and disassembled, which is convenient for repair.

[0124] In an alternative embodiment, as shown in ​ and ​ The frame 42 includes a frame main body, the frame main body is provided with a left end beam 441 and a right end beam 442 in the first direction Y, and the frame main body is provided with a front end beam 443 and a rear end beam 444 in the second direction X, and the left end beam 441, the right end beam 442, the front end beam 443 and the rear end beam 444 are connected in sequence. The BDU main body 61 is fixed outside the rear end beam 444, and the connection plug 62 is fixed inside the rear end beam 444. It should be noted that the inside of the rear end beam 444 refers to the inside of the battery pack, and the outside of the rear end beam 444 refers to the outside of the battery pack.

[0125] Optionally, the rear end beam 444 is provided with an insulating hole 4441 for the pin 621 to pass through. The pin 621 can pass through the insulating hole 4441 and be connected with the BDU main body 61.

[0126] The insulating hole 4441 is a hole that has been insulated. The shape of the insulating hole 4441 can be circular or other shapes.

[0127] Optionally, a sealant is arranged between the BDU main body 61 and the rear end beam 444. Specifically, the sealant is arranged between the surfaces of the BDU main body 61 and the rear end beam 444 in contact. In this way, the overall sealing performance of the battery pack can be improved.

[0128] The embodiment of the application provides a vehicle comprising a battery pack.

[0129] In the battery pack of the embodiment, the structure is the same as that of the battery pack provided by any of the above embodiments, and the same or similar technical effects can be achieved. For details, refer to the description of the above embodiments.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. The modification or replacement does not change the essence of the corresponding technical solution beyond the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized by, The upper cover plate, the battery cell group, the first connecting sheet, the second connecting sheet and the tray are included. The upper cover plate and the tray are connected with the battery cell group respectively, the battery cell group includes a plurality of battery cell rows, the battery cell row includes a plurality of battery cells, the battery cell rows of the battery cell group are arranged side by side along a first direction, and the battery cells of the battery cell row are arranged in sequence along a second direction, and the two ends of the battery cells in the second direction are provided with first and second pole columns. The first and second pole columns between adjacent battery cells of the battery cell row are connected with the first connecting sheet, and the second connecting sheet is connected between adjacent battery cell rows of the battery cell group. The side of the battery cell group connected with the upper cover plate in a third direction is a plane, the upper cover plate is fixedly connected with the plane of the battery cell group and the tray through structural glue respectively, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction. The tray includes a bottom plate and a frame, the frame is arranged on the bottom plate, and the battery cell group is accommodated in a space surrounded by the bottom plate and the frame. A plurality of cooling plates are further included, and one cooling plate is arranged between adjacent battery cell rows of the battery cell group. The cooling plate has a liquid inlet channel and a liquid outlet channel, the frame includes a frame body and a collection pipeline plate, the collection pipeline plate is located outside the frame body, the collection pipeline plate has a liquid inlet cavity and a liquid outlet cavity, the collection pipeline plate is provided with one liquid inlet connector, one liquid outlet connector, a plurality of liquid inlet branch pipes and a plurality of liquid return branch pipes, the liquid inlet connector and the plurality of liquid inlet branch pipes are in communication with the liquid inlet cavity respectively, and the liquid outlet connector and the plurality of liquid return branch pipes are in communication with the liquid outlet cavity respectively; each liquid inlet branch pipe is in communication with the liquid inlet channel of one cooling plate after penetrating the frame body, and each liquid return branch pipe is in communication with the liquid outlet channel of one cooling plate after penetrating the frame body; or The cooling plate has a cooling channel, the frame has a liquid inlet cavity and a liquid outlet cavity, a plurality of liquid inlet branch pipes are arranged between the liquid inlet cavity and one end of the cooling channel of the plurality of cooling plates, and a plurality of liquid return branch pipes are arranged between the liquid outlet cavity and the other end of the cooling channel of the plurality of cooling plates; the frame is provided with one liquid inlet connector and one liquid outlet connector, the liquid inlet connector is in communication with the liquid inlet cavity, and the liquid outlet connector is in communication with the liquid outlet cavity.

2. The battery pack of claim 1, wherein, The battery cell includes a square battery cell body, the square battery cell body has a first plane, a second plane, a third plane, a fourth plane, a fifth plane and a sixth plane, the first plane and the second plane are arranged in parallel with respect to each other in the first direction, the third plane and the fourth plane are arranged vertically between the first plane and the second plane, the fifth plane and the sixth plane are arranged vertically between the first plane and the second plane, the third plane and the fourth plane are arranged in parallel with respect to each other in the second direction, and the fifth plane and the sixth plane are arranged in parallel with respect to each other in the third direction. The side of the square-shaped battery cell body connected with the upper cover plate in the third direction is the fifth plane, the first pole column is arranged on the third plane, and the second pole column is arranged on the fourth plane.

3. The battery pack of claim 2, wherein, The first connecting piece includes a first L-shaped body and a second L-shaped body, the first L-shaped body is connected with the first pole column between the adjacent battery cells of the battery cell row through welding, and the second L-shaped body is connected with the second pole column between the adjacent battery cells of the battery cell row through welding; or the first connecting piece is a long-circular hollow piece, and the side surface of the hollow piece is connected with the first pole column and the second pole column between the adjacent battery cells of the battery cell row through welding.

4. The battery pack of claim 2, wherein, The second connecting piece is a square-shaped connecting plate, and the connecting plate is connected with the first pole column and the second pole column at the same end of the adjacent battery cell row in the second direction through welding.

5. The battery pack of claim 1, wherein, The side of the battery cell connected with the bottom plate in the third direction is provided with an explosion-proof valve; The bottom plate is provided with a first smoke exhaust channel and a plurality of through holes, each explosion-proof valve corresponds to a through hole, and the first smoke exhaust channel is in communication with each through hole. The inside of the frame is provided with a second smoke exhaust channel and a pressure relief port, one end of the second smoke exhaust channel is in communication with the first smoke exhaust channel, and the other end of the second smoke exhaust channel is in communication with the pressure relief port.

6. The battery pack of claim 1, wherein, Further comprising a BDU, the BDU includes a BDU body and a connecting plug, the BDU body is detachably fixed to the outside of the frame, and the connecting plug is fixed to the inside of the frame. The BDU body is provided with an electrical vulnerable element, the connecting plug is provided with three pins, and the three pins are connected with the BDU body through the frame.

7. A vehicle characterized by comprising: The battery pack includes the battery pack as claimed in any one of claims 1-6.

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