Battery pack and vehicle

Abstract

The application provides a battery pack and a vehicle, and relates to the technical field of power batteries. The battery pack comprises a tray, a battery cell group, a first connecting sheet, a second connecting sheet and a plurality of cooling plates; the tray comprises 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. The vehicle comprises the battery pack. 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, the battery cells of each battery cell row are arranged in sequence along a second direction, both ends of each battery cell in the second direction are provided with a first pole and a second pole, and one cooling plate is arranged between adjacent battery cell rows of the battery cell group. The first pole, the second pole, the first connecting sheet and the second connecting sheet are cooled through the cooling plate, so that the problem that the first pole, the second pole, the first connecting sheet and the second connecting sheet are high in temperature can be avoided, and the battery pack can be charged at a high charging rate.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and more particularly to a battery pack and a vehicle. Background Technology

[0002] With the development of new energy vehicles, in order to further improve the safety and economy of battery systems, conventional battery systems are gradually moving towards a vehicle-mounted structure, with the battery cover serving as the vehicle's load-bearing structure. CTC (Cell To Chassis) technology integrates the tray and the battery cell, reducing the intermediate steps in mounting the cell to the vehicle body, thus reducing costs and weight, and increasing driving range. Major OEMs and battery companies are actively investing in the development of this technology. CTC battery packs generate a large amount of heat during rapid charging and discharging. If this heat cannot be dissipated quickly and effectively, its accumulation may lead to safety accidents such as battery overheating, fire, and explosion.

[0003] In related technologies, the CTC battery pack includes a top cover, battery cells, cooling plates, connecting tabs, and a tray. Multiple battery cells are arranged between the top cover and the tray, along the Z-axis. Each battery cell has a terminal post at its Z-axis end near the top cover. The connecting tabs connect the terminals of adjacent battery cells. The top cover and the tray are connected by structural adhesive. Multiple cooling plates are located at the bottom of the battery cells. The top cover of the CTC battery pack is integrated with the vehicle's passenger compartment floor, sealing the passenger compartment.

[0004] However, when CTC battery packs are charged at higher charging rates, the connection plates and terminals may experience high temperatures. Summary of the Invention

[0005] This invention provides a battery pack and a vehicle to solve the problem of high temperatures of the connecting pieces and terminals when the CTC battery pack is charged at a high charging rate.

[0006] On one hand, the present invention provides a battery pack, including a tray, a cell assembly, a first connecting piece, a second connecting piece, and a plurality of cooling plates;

[0007] The tray includes a base plate and a frame, the frame being disposed on the base plate, and the battery cell assembly being housed within the space enclosed by the base plate and the frame;

[0008] The battery cell group includes multiple cell rows, and each cell row includes multiple cells. The cell rows of the battery cell group are arranged side by side along a first direction, and the cells of the cell rows are arranged sequentially along a second direction. Each cell has a first terminal and a second terminal at both ends in the second direction.

[0009] The first connecting piece is connected between the first and second terminals of adjacent cells in the cell array, and the second connecting piece is connected between adjacent cell arrays in the cell group.

[0010] A cooling plate is provided between adjacent cell rows of the cell group. The cooling plate extends along the second direction and is located on one side of the first terminal, the second terminal, the first connecting piece, and the second connecting piece on the cell row. The cooling plate is used to cool the first terminal, the second terminal, the first connecting piece, and the second connecting piece.

[0011] Optionally, it also includes an upper cover plate, the upper cover plate and the tray are respectively connected to the battery cell assembly, the side of the battery cell assembly that is connected to the upper cover plate in the third direction is a plane, and the upper cover plate is fixedly connected to the plane of the battery cell assembly and the tray respectively by structural adhesive.

[0012] Optionally, the battery cell includes a square battery cell body, the battery cell body having 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 being arranged relatively parallel in a first direction, the third plane and the fourth plane being arranged perpendicularly between the first plane and the second plane, the fifth plane and the sixth plane being arranged perpendicularly between the first plane and the second plane, the third plane and the fourth plane being arranged relatively parallel in a second direction, and the fifth plane and the sixth plane being arranged relatively parallel in a third direction.

[0013] The side of the battery cell body that connects to the upper cover plate in the third direction is the fifth plane, the first electrode post is disposed on the third plane, and the second electrode post is disposed on the fourth plane;

[0014] In the first direction, the first plane and the second plane of the adjacent battery cells are respectively attached to the cooling plate.

[0015] Optionally, a first heat-conducting component is provided between the first electrode and the cooling plate, between the second electrode and the cooling plate, between the first electrode and the cooling plate, and between the second electrode and the cooling plate.

[0016] Optionally, the first connecting piece includes a first connecting body and a second connecting body. The first connecting body is welded to a first terminal between adjacent cells of the cell array, and the second connecting body is welded to a second terminal between adjacent cells of the cell array. The first connecting body and the second connecting body form a quadrilateral cavity or a hexagonal cavity.

[0017] Optionally, the second connecting piece is provided with a first cooling wall, a first welding wall, a U-shaped wall, a second welding wall, and a second cooling wall;

[0018] The first cooling wall is perpendicularly connected to the first welding wall, the second cooling wall is perpendicularly connected to the second welding wall, the first cooling wall and the second cooling wall are arranged in parallel, and the U-shaped wall is connected between the first welding wall and the second welding wall;

[0019] The first welded wall is welded to the first electrode post at one end of the adjacent cell array in the second direction, and the second welded wall is welded to the second electrode post at one end of the adjacent cell array in the second direction.

[0020] The cooling plate has a first end and a second end in the second direction. A second heat-conducting component is provided between the first end and the first cooling wall, and between the first end and the second cooling wall. A third heat-conducting component is provided between the second end and the U-shaped wall.

[0021] Optionally, the cooling plate has a cooling channel, the frame has a liquid inlet chamber and a manifold chamber, a plurality of liquid inlet branch pipes are provided between the liquid inlet chamber and one end of the cooling channel of the plurality of cooling plates, and a plurality of liquid return branch pipes are provided between the manifold chamber and the other end of the cooling channel of the plurality of cooling plates.

[0022] The frame is provided with an inlet connector and an outlet connector. The inlet connector is connected to the inlet chamber, and the outlet connector is connected to the manifold.

[0023] Optionally, it also includes a BDU, which includes a BDU body and a connecting plug, wherein the BDU body is detachably fixed to the outside of the frame and the connecting plug is fixed to the inside of the frame;

[0024] The BDU body contains easily damaged electrical components, and the connector has three pins that pass through the frame and connect to the BDU body.

[0025] Optionally, the frame includes a frame body and a baffle plate. The frame body is provided with a left end beam and a right end beam in the second direction. The frame body is provided with a front end beam and a rear end beam in the first direction. The left end beam, the right end beam, the front end beam and the rear end beam are connected vertically in sequence. The baffle plate is arranged around the outside of the left end beam, the right end beam and the front end beam.

[0026] The BDU body is fixed to the outside of the rear end beam, the connecting plug is fixed to the inside of the rear end beam, and the liquid inlet connector and the liquid outlet connector are located on the outside of the front end beam.

[0027] The baffle plate and the right end beam, as well as the baffle plate and a portion of the front end beam, form the liquid inlet cavity; the baffle plate and the left end beam, as well as the baffle plate and a portion of the front end beam, form the confluence cavity;

[0028] The rear beam is provided with a connecting cavity, which connects the liquid inlet cavity and the manifold cavity.

[0029] On the other hand, the present invention provides a vehicle including the battery pack described above.

[0030] This invention provides a battery pack and a vehicle. The battery cell assembly includes multiple cell rows, and each cell row includes multiple cells. The cell rows of the battery cell assembly are arranged side by side along a first direction, and the cells of the cell rows are arranged sequentially along a second direction. Each cell has a first terminal and a second terminal at both ends in the second direction. A cooling plate is provided between adjacent cell rows of the battery cell assembly. The cooling plate extends along the second direction and is located on one side of the first terminal, the second terminal, the first connecting piece, and the second connecting piece on the cell row. The cooling plate cools the first terminal, the second terminal, the first connecting piece, and the second connecting piece, thereby avoiding the problem of high temperature of the first terminal, the second terminal, the first connecting piece, and the second connecting piece, and thus enabling the battery pack to be charged at a higher charging rate. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present invention. Figure 1 ;

[0033] Figure 2 for Figure 1 A diagram of the battery pack in the middle. Figure 2 ;

[0034] Figure 3 for Figure 1 A schematic diagram of the battery pack exploding in the image;

[0035] Figure 4 for Figure 3 A schematic diagram of the battery cell assembly in the diagram;

[0036] Figure 5 A schematic diagram of a battery cell provided in an embodiment of the present invention. Figure 1 ;

[0037] Figure 6 for Figure 5 Schematic diagram of the battery cell Figure 2 ;

[0038] Figure 7 for Figure 4 A schematic diagram of the connection between adjacent cells in a cell bank. Figure 1 ;

[0039] Figure 8 for Figure 7 Schematic diagram of the connection between adjacent battery cells Figure 2 :

[0040] Figure 9 for Figure 4 Another schematic diagram of the connection between adjacent cells in the cell block;

[0041] Figure 10 for Figure 4 Another connection diagram of adjacent cells in the cell busbar. Figure 1 ;

[0042] Figure 11 for Figure 10 Schematic diagram of the connection between adjacent battery cells Figure 2 :

[0043] Figure 12 for Figure 4 A schematic diagram of the connection between adjacent cell blocks;

[0044] Figure 13 for Figure 12 A schematic diagram of the structure of the second connecting piece in the middle;

[0045] Figure 14 for Figure 3 Partial explosion diagram;

[0046] Figure 15 for Figure 14 A partial schematic diagram of the tray in the image;

[0047] Figure 16 for Figure 15 Schematic diagram of AA section in the middle;

[0048] Figure 17 for Figure 3 A schematic diagram of the cooling plate structure.

[0049] Explanation of reference numerals in the attached figures:

[0050] 10-Top cover plate; 20-Cell assembly; 21-Cell busbar; 211-Cell; 2111-First terminal; 2112-Second terminal; 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 piece; 311-First connecting body; 312-Second connecting body; 3101-First connecting wall; 3102-Second connecting wall; 3103-Third connecting wall; 3104-Fourth connecting wall; 3105-Fifth connecting wall; 32-Second connecting piece; 321-First cooling wall; 322-First welding wall; 323-U-shaped wall; 324-Second welding wall; 325-Second cooling wall ; 40-Tray; 41-Base plate; 42-Frame; 43-Baffle plate; 431-Inlet chamber; 432-Manifold chamber; 433-Inlet connector; 434-Outlet connector; 435-Inlet branch pipe; 436-Return branch pipe; 437-Connecting chamber; 4211-First through hole; 4212-Second through hole; 441-Left end beam; 442-Right end beam; 443-Front end beam; 444-Rear end beam; 4441-Insulation hole; 4442-Pressure relief valve; 50-Cooling plate; 51-First heat-conducting component; 52-Second heat-conducting component; 53-Third heat-conducting component; 501-First end; 502-Second end; 503-End plane; 504-Cooling channel; 60-BDU; 61-BDU body; 62-Connecting plug; 621-Pin. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] In related technologies, a CTC battery pack includes a top cover, battery cells, cooling plates, connecting tabs, and a tray. Multiple battery cells are arranged between the top cover and the tray, along the Z-axis. Each battery cell has a terminal post at its Z-axis end near the top cover. Connecting tabs connect the terminals of adjacent cells. The top cover and tray are connected by structural adhesive. Multiple cooling plates are located at the bottom of the battery cells. The top cover of the CTC battery pack is integrated with the vehicle's passenger compartment floor, sealing the passenger compartment. However, because the terminals and connecting tabs of the battery cells are located on top of the cells and far from the cooling plates, when the CTC battery pack is charged at a high charging rate, the temperature of the terminals and connecting tabs rises sharply. The cooling plates at the bottom of the cells cannot effectively cool and dissipate heat from the terminals and connecting tabs, resulting in high temperatures for the connecting tabs and terminals.

[0057] To address the aforementioned problems, this invention provides a battery pack and a vehicle. The battery cell assembly includes multiple cell rows, each containing multiple cells. The cell rows are arranged side-by-side along a first direction, and the cells within each cell row are arranged sequentially along a second direction. Each cell has a first terminal and a second terminal at both ends in the second direction. The cells are no longer arranged along the Z-direction but rather along a direction perpendicular to the Z-direction, i.e., along the second direction. A cooling plate is provided between adjacent cell rows in the battery cell assembly, extending along the second direction. The cooling plate is located on one side of the first terminal, second terminal, first connecting piece, and second connecting piece on the cell row. The cooling plate not only cools the cell body but also cools the first terminal, second terminal, first connecting piece, and second connecting piece, thereby preventing the first terminal, second terminal, first connecting piece, and second connecting piece from overheating. This allows the battery pack to be charged at a higher charging rate. It should be noted that the Z-direction refers to the direction from the tray to the top cover, which is the third direction of this application.

[0058] The battery pack and vehicle provided in the embodiments of the present invention will be described in detail below with reference to specific examples.

[0059] Figure 1 A schematic diagram of a battery pack provided in an embodiment of the present invention. Figure 1 ; Figure 2 for Figure 1 A diagram of the battery pack in the middle. Figure 2 ; Figure 3 for Figure 1 A schematic diagram of the battery pack exploding in the image; Figure 4 for Figure 3 A schematic diagram of the battery cell assembly in the diagram. Figure 3 The arrows in the text indicate the direction of coolant flow; Figure 5 A schematic diagram of a battery cell provided in an embodiment of the present invention. Figure 1 ; Figure 6 for Figure 5 Schematic diagram of the battery cell Figure 2 ; Figure 7 for Figure 4 A schematic diagram of the connection between adjacent cells in a cell bank. Figure 1 ; Figure 8 for Figure 7 Schematic diagram of the connection between adjacent battery cells Figure 2 : Figure 9 for Figure 4 Another schematic diagram of the connection between adjacent cells in the cell block; Figure 10 for Figure 4 Another connection diagram of adjacent cells in the cell busbar. Figure 1 ; Figure 11 for Figure 10 Schematic diagram of the connection between adjacent battery cells Figure 2 : Figure 12 for Figure 4 A schematic diagram of the connection between adjacent cell blocks; Figure 13 for Figure 12 A schematic diagram of the structure of the second connecting piece.

[0060] like Figures 1 to 13 As shown, this embodiment of the invention provides a battery pack, including an upper cover plate 10, a cell assembly 20, a first connecting piece 31, a second connecting piece 32, a tray 40, and a plurality of cooling plates 50. The upper cover plate 10 and the tray 40 are respectively connected to the cell assembly 20 in the third direction Z. The tray 40 includes a base plate 41 and a frame 42, with the frame 42 disposed on the base plate 41. The cell assembly 20 is accommodated within the space enclosed by the base plate 41 and the frame 42.

[0061] like Figures 4 to 6 As shown, the battery pack 20 includes multiple battery cell rows 21, and each battery cell row 21 includes multiple battery cells 211. The battery cell rows 21 of the battery pack 20 are arranged side by side along a first direction X, and the battery cells 211 of the battery cell rows 21 are arranged sequentially along a second direction Y. Each battery cell 211 has a first terminal post 2111 and a second terminal post 2112 at both ends in the second direction Y.

[0062] Specifically, the first direction X is perpendicular to the second direction Y, and the third direction Z is perpendicular to both the first direction X and the second direction Y. Specifically, the first direction X can be the front-to-back direction of the vehicle body when the battery pack is installed in the vehicle body; the second direction Y can be the left-to-right direction of the vehicle body when the battery pack is installed in the vehicle body; and the third direction Z can be the up-and-down direction of the vehicle body when the battery pack is installed in the vehicle body.

[0063] like Figures 7 to 13As shown, a first connecting piece 31 is connected between the first terminal 2111 and the second terminal 2112 between adjacent cells 211 of the cell array 21, and a second connecting piece 32 is connected between adjacent cell arrays 21 of the cell group 20. Specifically, since the cells 211 of the cell array 21 extend along the second direction Y, the first terminals 2111 and the second terminals 2112 of adjacent cells 211 are correspondingly arranged in the second direction Y. The first terminals 2111 and the second terminals 2112 of adjacent cells 211 are electrically connected by the first connecting piece 31, so that the cells 211 of the cell array 21 can be connected in series. Since the cell arrays 21 of the cell group 20 are arranged side by side in the first direction X, the first terminal 2111 of one cell 211 at the same end of the two cells 211 of the adjacent cell array 21 in the second direction Y is correspondingly arranged with the second terminal 2112 of the other cell 211. The first terminal 2111 of one cell 211 at the same end of the two cells 211 at the same end is electrically connected with the second terminal 2112 of the other cell 211, so that the cell arrays 21 of the cell group 20 can be connected in series.

[0064] Cell 211 can be a ternary lithium battery cell. In other cases, cell 211 can also be a cell made of other materials.

[0065] like Figure 3 As shown, a cooling plate 50 is provided between adjacent cell rows 21 of the cell assembly 20, and the cooling plate 50 extends along the second direction Y. In the first direction X, the cooling plate 50 is located on one side of the first terminal post 2111, the second terminal post 2112, the first connecting piece 31, and the second connecting piece 32 on the cell row 21.

[0066] like Figure 12 As shown, the cooling plate 50 can be directly attached to the first terminal 2111 on the cell array 21, or indirectly attached through a heat-conducting component. The cooling plate 50 can be directly attached to the second terminal 2112 on the cell array 21, or indirectly attached through a heat-conducting component. The cooling plate 50 can be directly attached to the first connecting piece 31 on the cell array 21, or indirectly attached through a heat-conducting component. The cooling plate 50 can be directly attached to the second connecting piece 32 on the cell array 21, or indirectly attached through a heat-conducting component.

[0067] In addition to the first terminal 2111 and the second terminal 2112, the battery cell 211 also includes a cell body, which is directly attached to the cooling plate 50. The cooling plate 50 can not only cool the cell body, but also cool the first terminal 2111, the second terminal 2112, the first connecting piece 31, and the second connecting piece 32, thereby avoiding the problem of high temperature of the first terminal 2111, the second terminal 2112, the first connecting piece 31, and the second connecting piece 32, and thus enabling the battery pack to be charged at a higher charging rate.

[0068] Optionally, the side of the battery cell assembly 20 that connects to the upper cover plate 10 in the third direction Z is a flat surface, and the upper cover plate 10 is fixedly connected to the flat surface of the battery cell assembly 20 and the tray 40 respectively by structural adhesive.

[0069] The upper cover 10 can be integrated with the vehicle's passenger compartment floor, meaning that the upper cover 10 and the passenger compartment floor are the same component. Specifically, the upper cover 10 can be considered as the vehicle's passenger compartment floor, and the vehicle's passenger compartment floor can be the upper cover 10. The upper cover 10 is fixedly connected to the tray 40 and the plane of the cell assembly 20 in the third direction Z using structural adhesive. This improves the connection strength between the upper cover 10 and other parts of the battery pack, making it less likely for the upper cover 10 to separate from the other parts of the battery pack in the third direction Z, thereby improving occupant safety.

[0070] Furthermore, such as Figure 5 and 6 As shown, the battery cell 211 includes a square battery cell body. The 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 relatively parallel to each other in the first direction X. 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 relatively parallel to each other in the second direction Y. The fifth plane 2117 and the sixth plane 2118 are arranged relatively parallel to each other in the third direction Z.

[0071] Among them, the side of the battery cell body that is connected to the upper cover plate 10 in the third direction Z is the fifth plane 2117, the first pole post 2111 is set on the third plane 2115, and the second pole post 2112 is set on the fourth plane 2116.

[0072] The fifth plane 2117 of the battery cell body is fixedly connected to the upper cover plate 10 by structural adhesive.

[0073] The plane formed by the fifth plane 2117 of the square cell body of all the cells 211 in the cell group 20 is fixedly connected to the top cover plate 10 by structural adhesive.

[0074] In the first direction X, the first plane 2113 and the second plane 2114 of the adjacent cells 211 are respectively attached to the cooling plate 50.

[0075] It should be noted that the areas of the first plane 2113 and the second plane 2114 are equal, and the first plane 2113 and the second plane 2114 are the surfaces with the largest area of ​​the battery cell 211.

[0076] Optionally, such as Figure 1 and Figure 6 As shown, the battery cell 211 is provided with an explosion-proof valve 2119 on the side connected to the base plate 41 in the third direction Z; the base plate 41 and the frame 42 are provided with a smoke exhaust channel, and the frame 42 is also provided with a pressure relief valve 4442.

[0077] The explosion-proof valve 2119 can cut off the current circuit when the internal pressure in the battery cell 211 is high. The explosion-proof valve 2119 can also release the internal pressure of the battery cell 211 by being broken when the internal pressure in the battery cell 211 is high.

[0078] In one alternative implementation, Figure 14 for Figure 3 A partial explosion diagram. (See attached image.) Figure 14 As shown, 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 second direction Y. The frame body is provided with a front end beam 443 and a rear end beam 444 in the first 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 vertically in sequence. The pressure relief valve 4442 is provided on the rear end beam 444.

[0079] When thermal runaway occurs in the battery pack, hazardous substances can be directly injected into the exhaust channels inside the base plate 41 and frame 42, and then discharged outside the battery pack via the pressure relief valve 4442. This prevents hazardous substances from being sprayed directly towards the passenger compartment and effectively reduces the rate of heat spread, thereby improving the safety performance of the battery pack. It should be noted that when thermal runaway occurs in the battery pack, hazardous substances first pass through the exhaust channels inside the base plate 41, then through the exhaust channels inside the frame 42, and finally are discharged outside the battery pack via the pressure relief valve 4442.

[0080] Optionally, such as Figure 12As shown, a first heat-conducting component 51 is provided between the first terminal 2111 and the cooling plate 50, between the second terminal 2112 and the cooling plate 50, between the first connecting piece 31 and the cooling plate 50, and between the second connecting piece 32 and the cooling plate 50. The cooling plate 50 is attached to the first terminal 2111, the second terminal 2112, the first connecting piece 31 and the second connecting piece 32 of the cell array 21 through the first heat-conducting component 51, and cools the first terminal 2111, the second terminal 2112, the first connecting piece 31 and the second connecting piece 32.

[0081] The first heat-conducting component 51 can be either thermally conductive adhesive or a thermally conductive sheet.

[0082] Optionally, the first connecting piece 31 includes a first connecting body 311 and a second connecting body 312. The first connecting body 311 is connected to the first terminal 2111 between adjacent cells 211 of the cell array 21 by welding, and the second connecting body 312 is connected to the second terminal 2112 between adjacent cells 211 of the cell array 21 by welding.

[0083] The shape of the first connecting body 311 and the shape of the second connecting body 312 may be the same or different, and no specific setting is made here. In this embodiment, the shape of the first connecting body 311 and the shape of the second connecting body 312 are the same.

[0084] The first connecting body 311 and the second connecting body 312 can be formed by stamping.

[0085] In an alternative implementation, such as Figure 7 and Figure 8As shown, both the first connecting body 311 and the second connecting body 312 include a first connecting wall 3101, a second connecting wall 3102, and a third connecting wall 3103. The first connecting wall 3101 is perpendicularly connected to the second connecting wall 3102, and the third connecting wall 3103 is perpendicularly connected to the second connecting wall 3102. The first connecting wall 3101 and the third connecting wall 3103 are arranged parallel to each other. In the direction perpendicular to the second connecting wall 3102, the length of the first connecting wall 3101 is greater than the length of the third connecting wall 3103. The second connecting wall 3102 of the first connecting body 311 is welded to the first pole post 2111, and the second connecting wall 3102 of the second connecting body 312 is welded to the second pole post 2112. The first connecting wall 3101 of the first connecting body 311 and the third connecting wall 3103 of the second connecting body 312 are located in different planes, and the side of the first connecting wall 3101 of the first connecting body 311 is welded to the side of the third connecting wall 3103 of the second connecting body 312. The third connecting wall 3103 of the first connecting body 311 and the first connecting wall 3101 of the second connecting body 312 are located in different planes, and the side of the third connecting wall 3103 of the first connecting body 311 is welded to the side of the first connecting wall 3101 of the second connecting body 312. The first connecting body 311 and the second connecting body 312 form a quadrilateral cavity.

[0086] In another alternative implementation, such as Figure 9 As shown, both the first connecting body 311 and the second connecting body 312 include a first connecting wall 3101, a second connecting wall 3102, and a third connecting wall 3103. The first connecting wall 3101 is perpendicularly connected to the second connecting wall 3102, and the third connecting wall 3103 is perpendicularly connected to the second connecting wall 3102. The first connecting wall 3101 and the third connecting wall 3103 are arranged parallel to each other. In the direction perpendicular to the second connecting wall 3102, the length of the first connecting wall 3101 is greater than the length of the third connecting wall 3103. The second connecting wall 3102 of the first connecting body 311 is welded to the first pole post 2111, and the second connecting wall 3102 of the second connecting body 312 is welded to the second pole post 2112. The first connecting wall 3101 of the first connecting body 311 and the third connecting wall 3103 of the second connecting body 312 are located in the same plane, and are welded together after being joined. The third connecting wall 3103 of the first connecting body 311 and the first connecting wall 3101 of the second connecting body 312 are located in the same plane, and are welded together after being joined. The first connecting body 311 and the second connecting body 312 form a quadrilateral cavity.

[0087] In another alternative implementation, such as Figure 10 and Figure 11 As shown, both the first connecting body 311 and the second connecting body 312 include a first connecting wall 3101, a second connecting wall 3102, a third connecting wall 3103, a fourth connecting wall 3104, and a fifth connecting wall 3105. The first connecting wall 3101 is inclinedly connected to the second connecting wall 3102, the second connecting wall 3102 is inclinedly connected to the third connecting wall 3103, the third connecting wall 3103 is inclinedly connected to the fourth connecting wall 3104, and the fourth connecting wall 3104 is inclinedly connected to the fifth connecting wall 3105. The first connecting wall 3101 and the third connecting wall 3103 are arranged parallel to each other and are located in different planes. The first connecting wall 3101 and the fifth connecting wall 3105 are arranged parallel to each other and are located in the same plane. The third connecting wall 3103 of the first connecting body 311 is welded to the first pole post 2111, and the third connecting wall 3103 of the second connecting body 312 is welded to the second pole post 2112; the first connecting wall 3101 of the first connecting body 311 and the first connecting wall 3101 of the second connecting body 312 are joined together and then connected by laser welding; the fifth connecting wall 3105 of the first connecting body 311 and the fifth connecting wall 3105 of the second connecting body 312 are joined together and then connected by welding. The first connecting body 311 and the second connecting body 312 form a hexagonal cavity.

[0088] Optionally, such as Figure 13 As shown, the second connecting piece 32 is provided with a first cooling wall 321, a first welding wall 322, a U-shaped wall 323, a second welding wall 324, and a second cooling wall 325; the first cooling wall 321 is perpendicularly connected to the first welding wall 322, the second cooling wall 325 is perpendicularly connected to the second welding wall 324, the first cooling wall 321 and the second cooling wall 325 are arranged in parallel, and the U-shaped wall 323 is connected between the first welding wall 322 and the second welding wall 324.

[0089] The second connecting piece 32 can be formed by stamping.

[0090] like Figure 12 and Figure 13 As shown, the first welded wall 322 is welded to the first terminal 2111 at one end of the adjacent cell array 21 in the second direction Y, and the second welded wall 324 is welded to the second terminal 2112 at one end of the adjacent cell array 21 in the second direction Y. It should be noted that the first terminal 2111 and the second terminal 2112 at the same end of the adjacent cell array 21 in the second direction Y are respectively welded to the second connecting piece 32.

[0091] The cooling plate 50 has a first end 501 and a second end 502 in the first direction X. A second heat-conducting component 52 is provided between the first end 501 and the first cooling wall 321 and between the first end 501 and the second cooling wall 325. A third heat-conducting component 53 is provided between the second end 502 and the U-shaped wall 323.

[0092] The second heat-conducting component 52 can be either thermally conductive adhesive or a thermally conductive sheet. The third heat-conducting component 53 can also be either thermally conductive adhesive or a thermally conductive sheet.

[0093] Figure 15 for Figure 14 A partial schematic diagram of the tray in the image; Figure 16 for Figure 15 Schematic diagram of AA section in the middle; Figure 17 for Figure 3 A schematic diagram of the cooling plate structure.

[0094] Optionally, such as Figure 3 and Figure 17 As shown, the cooling plate 50 has a cooling channel 504, the frame 42 has a liquid inlet chamber 431 and a manifold chamber 432, a plurality of liquid inlet branch pipes 435 are provided between the liquid inlet chamber 431 and one end of the cooling channel 504 of the plurality of cooling plates 50, and a plurality of liquid return branch pipes 436 are provided between the manifold chamber 432 and the other end of the cooling channel 504 of the plurality of cooling plates 50.

[0095] The frame 42 is provided with an inlet connector 433 and an outlet connector 434. The inlet connector 433 is connected to the inlet chamber 431, and the outlet connector 434 is connected to the manifold 432.

[0096] The cooling plate 50 is provided with at least one cooling channel 504. In an optional embodiment, the cooling plate 50 is provided with multiple cooling channels 504, all of which extend along the second direction Y. Each cooling plate 50 corresponds to an inlet branch pipe 435 and a return branch pipe 436.

[0097] Cooling channel 504 extends through both ends of cooling plate 50 in the direction of its extension. Inlet branch pipe 435 and return branch pipe 436 are located at both ends of cooling channel 504.

[0098] Figure 14 and 15 As shown, the frame 42 includes a frame body and a baffle plate 43. The frame body is provided with a left end beam 441 and a right end beam 442 in the second direction Y. The frame body is provided with a front end beam 443 and a rear end beam 444 in the first 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 vertically in sequence.

[0099] The inlet connector 433 and the outlet connector 434 are located on the outside of the front beam 443. The right end beam 442 is provided with a first through hole 4211 for the inlet branch pipe 435 to pass through, and the left end beam 441 is provided with a second through hole 4212 for the return branch pipe 436 to pass through.

[0100] The enclosure panel 43 is installed around the outside of the left end beam 441, the right end beam 442, and the front end beam 443. The enclosure panel 43 can be connected to the left end beam 441 by welding or adhesive. The connection method between the enclosure panel 43 and the right end beam 442 is the same as the connection method between the enclosure panel 43 and the left end beam 441, and the connection method between the enclosure panel 43 and the front end beam 443 is the same as the connection method between the enclosure panel 43 and the front end beam 443.

[0101] Sealant or sealing rings are provided between the inlet branch pipe 435 and the right end beam 442, and between the return branch pipe 436 and the left end beam 441. Specifically, sealant or sealing rings are provided between the plane of the inlet branch pipe 435 and the right end beam 442 away from the cooling plate 50, and between the plane of the return branch pipe 436 and the left end beam 441 away from the cooling plate 50. This arrangement improves the overall sealing of the battery pack.

[0102] Sealant is applied between the inlet branch pipe 435 and the cooling plate 50, and between the return branch pipe 436 and the cooling plate 50. Specifically, the cooling plate 50 has an end plane 503. The inlet branch pipe 435 passes through the right end beam 442 and abuts against the end plane 503. The return branch pipe 436 passes through the left end beam 441 and abuts against the end plane 503. Sealant is applied between the inlet branch pipe 435 and the end plane 503, and between the return branch pipe 436 and the end plane 503. This arrangement improves the sealing between the inlet branch pipe 435 and the end plane 503, and between the return branch pipe 436 and the end plane 503, thereby preventing leakage between the inlet branch pipe 435 and the cooling plate 50, and between the return branch pipe 436 and the cooling plate 50. It should be noted that in this embodiment, both ends of the cooling plate 50 have end planes 503.

[0103] Coolant flow process: The coolant first enters the inlet chamber 431 from the inlet connector 433, and then flows into each inlet branch pipe 435 through the inlet chamber 431. The coolant in each inlet branch pipe 435 is delivered through the cooling channel 504 of the corresponding cooling plate 50, and then flows back to the return branch pipe 436 through the cooling channel 504. The coolant in each return branch pipe 436 is merged in the manifold 432, and the coolant in the manifold 432 flows out through the outlet connector 434.

[0104] Optionally, such as Figure 3 and Figure 14As shown, the battery also includes a Battery Disconnect Unit (BDU) 60, which includes a BDU body 61 and a connector 62. The BDU body 61 is detachably fixed to the outside of the frame 42, and the connector 62 is fixed to the inside of the frame 42.

[0105] The BDU body 61 contains easily damaged electrical components. The BDU body 61 can be fixed to the frame 42 by adhesive or bolts; this is not specified here. The easily damaged electrical components include relays, fuses, sensors, and other easily damaged electrical devices.

[0106] The connector 62 does not contain any easily damaged electrical components, but it can accommodate some less susceptible electrical parts. The connector 62 can be fixed to the frame 42 by adhesive or bolts; this is not discussed here.

[0107] The connector 62 is used to connect the battery cell assembly 20 and the BDU body 61. Specifically, the connector 62 is provided with three pins 621, which pass through the frame 42 and connect to the BDU body 61.

[0108] The three pins 621 are connected to the BDU body 61 by both electrical and communication connections. Specifically, two pins 621 are electrically connected to the BDU body 61, and one pin 621 is communicatively connected to the BDU body 61.

[0109] When repairing or replacing the electrical consumables in the BDU60, only the BDU body 61 needs to be installed and disassembled separately, making maintenance convenient.

[0110] In one optional embodiment, the frame 42 includes a frame body and a baffle plate 43. The frame body has a left end beam 441 and a right end beam 442 in the second direction Y, and a front end beam 443 and a rear end beam 444 in the first direction X. The left end beam 441, right end beam 442, front end beam 443, and rear end beam 444 are connected vertically in sequence. The baffle plate 43 surrounds the outside of the left end beam 441, right end beam 442, and front end beam 443. The BDU body 61 is located outside the rear end beam 444 and is fixedly connected to the rear end beam 444. The connecting 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.

[0111] Furthermore, such as Figure 3As shown, the baffle plate 43 and the right end beam 442, as well as a portion of the baffle plate 43 and the front end beam 443, form an inlet cavity 431; the baffle plate 43 and the left end beam 441, as well as a portion of the baffle plate 43 and the front end beam 443, form a manifold cavity 432. The portion of the inlet cavity 431 located in the front end beam 443 is not connected to the portion of the manifold cavity 432 located in the front end beam 443.

[0112] like Figure 15 and Figure 16 As shown, the rear beam 444 is provided with a connecting cavity 437, which connects the liquid inlet cavity 431 and the manifold cavity 432. The coolant in the connecting cavity 437 can cool the BDU body 61 and the connecting plug 62.

[0113] Optionally, such as Figure 15 and Figure 16 As shown, the portion of the frame 42 located at the rear 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 connect to the BDU body 61.

[0114] Among them, the insulating hole 4441 is a hole that has been insulated. The shape of the insulating hole 4441 can be circular or other shapes.

[0115] It should be noted that the insulating hole 4441 is not connected to the manifold 432.

[0116] Optionally, a sealant is applied between the BDU body 61 and the rear beam 444. Specifically, a sealant is applied between the surfaces of the BDU body 61 and the rear beam 444 that come into contact. This design improves the overall sealing of the battery pack.

[0117] This invention provides a vehicle including a battery pack.

[0118] The battery pack in this embodiment has the same structure as the battery pack provided in any of the above embodiments and can bring the same or similar technical effects. It will not be described in detail here. For details, please refer to the description of the above embodiments.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that, Includes a tray, battery cell assembly, first connecting piece, second connecting piece, and multiple cooling plates; The tray includes a base plate and a frame, the frame being disposed on the base plate, and the battery cell assembly being housed within the space enclosed by the base plate and the frame; The battery cell group includes multiple cell rows, and each cell row includes multiple cells. The cell rows of the battery cell group are arranged side by side along a first direction, and the cells of the cell rows are arranged sequentially along a second direction. Each cell has a first terminal and a second terminal at both ends in the second direction. The first connecting piece is connected between the first and second terminals of adjacent cells in the cell array, and the second connecting piece is connected between adjacent cell arrays in the cell group. A cooling plate is provided between adjacent cell rows of the cell group. The cooling plate extends along the second direction and is located on one side of the first terminal, the second terminal, the first connecting piece, and the second connecting piece on the cell row. The cooling plate is used to cool the first terminal, the second terminal, the first connecting piece, and the second connecting piece. The battery cell includes a square battery cell body, the battery cell body having a first plane and a second plane, the first plane and the second plane being arranged relatively parallel to each other in a first direction; in the first direction, the first plane and the second plane of adjacent battery cells are respectively attached to a cooling plate; A first heat-conducting component is provided between the first electrode post and the cooling plate, between the second electrode post and the cooling plate, between the first connecting piece and the cooling plate, and between the second connecting piece and the cooling plate; The first connecting piece includes a first connecting body and a second connecting body. The first connecting body is welded to a first terminal between adjacent cells of the cell array, and the second connecting body is welded to a second terminal between adjacent cells of the cell array. The first connecting body and the second connecting body form a quadrilateral cavity or a hexagonal cavity.

2. The battery pack according to claim 1, characterized in that, It also includes an upper cover plate, which and the tray are respectively connected to the battery cell assembly. The side of the battery cell assembly that is connected to the upper cover plate in the third direction is a plane. The upper cover plate is fixedly connected to the plane of the battery cell assembly and the tray respectively by structural adhesive.

3. The battery pack according to claim 2, characterized in that, The battery cell body has a third plane, a fourth plane, a fifth plane, and a sixth plane. The third plane and the fourth plane are perpendicularly disposed between the first plane and the second plane. The fifth plane and the sixth plane are perpendicularly disposed between the first plane and the second plane. The third plane and the fourth plane are relatively parallel to each other in the second direction. The fifth plane and the sixth plane are relatively parallel to each other in the third direction. The side of the battery cell body that connects to the upper cover plate in the third direction is the fifth plane, the first electrode post is disposed on the third plane, and the second electrode post is disposed on the fourth plane.

4. The battery pack according to claim 1, characterized in that, The second connecting piece is provided with a first cooling wall, a first welding wall, a U-shaped wall, a second welding wall, and a second cooling wall; The first cooling wall is perpendicularly connected to the first welding wall, the second cooling wall is perpendicularly connected to the second welding wall, the first cooling wall and the second cooling wall are arranged in parallel, and the U-shaped wall is connected between the first welding wall and the second welding wall; The first welded wall is welded to the first electrode post at one end of the adjacent cell array in the second direction, and the second welded wall is welded to the second electrode post at one end of the adjacent cell array in the second direction. The cooling plate has a first end and a second end in the second direction. A second heat-conducting component is provided between the first end and the first cooling wall, and between the first end and the second cooling wall. A third heat-conducting component is provided between the second end and the U-shaped wall.

5. The battery pack according to any one of claims 1-4, characterized in that, The cooling plate has a cooling channel, the frame has a liquid inlet chamber and a manifold chamber, a plurality of liquid inlet branch pipes are provided between the liquid inlet chamber and one end of the cooling channel of the plurality of cooling plates, and a plurality of liquid return branch pipes are provided between the manifold chamber and the other end of the cooling channel of the plurality of cooling plates. The frame is provided with an inlet connector and an outlet connector. The inlet connector is connected to the inlet chamber, and the outlet connector is connected to the manifold.

6. The battery pack according to claim 5, characterized in that, It also includes a BDU, which includes a BDU body and a connecting plug, wherein 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 contains easily damaged electrical components, and the connector has three pins that pass through the frame and connect to the BDU body.

7. The battery pack according to claim 6, characterized in that, The frame includes a frame body and a baffle plate. The frame body is provided with a left end beam and a right end beam in the second direction. The frame body is provided with a front end beam and a rear end beam in the first direction. The left end beam, the right end beam, the front end beam and the rear end beam are connected vertically in sequence. The baffle plate is arranged around the outside of the left end beam, the right end beam and the front end beam. The BDU body is fixed to the outside of the rear end beam, the connecting plug is fixed to the inside of the rear end beam, and the liquid inlet connector and the liquid outlet connector are located on the outside of the front end beam. The baffle plate and the right end beam, as well as the baffle plate and a portion of the front end beam, form the liquid inlet cavity; the baffle plate and the left end beam, as well as the baffle plate and a portion of the front end beam, form the confluence cavity; The rear beam is provided with a connecting cavity, which connects the liquid inlet cavity and the manifold cavity.

8. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-7.

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