Battery packs and electric vehicles

Abstract

To provide a battery pack having simple structure, convenient assembly, high structural strength, and high space utilization and energy density, and an electric vehicle.SOLUTION: The battery pack includes a casing and a battery module positioned inside the casing. The battery module includes a battery unit and a reinforcing member. The battery unit includes N cells. At least some of the cells in the battery unit are connected by M reinforcing members. An outer surface of each cell includes a bottom surface facing a bottom surface of the casing, a top surface facing a top surface of the casing, and lateral surfaces. The lateral surfaces include a first lateral surface and two opposite second lateral surfaces. The first lateral surface has the largest area among the lateral surfaces. The area of the first lateral surface is greater than the area of the bottom surface and the area of the top surface. The N cells are arranged in sequence. The second lateral surfaces of two adjacent cells are arranged oppositely to each other. The reinforcing member is fixedly bonded to the first lateral surface of each cell in Q adjacent cells, where Q is an integer satisfying N>Q≥2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application was filed by BB Company Limited on November 18, 2019. In addition, the invention title "Battery pack and electric vehicle" is Chinese patent application No. 20191112853 This application claims priority from US Provisional Patent Application No. 9.4, the entire contents of which are incorporated herein by reference. This shall be the case.

[0002] This application relates to the technical field of batteries, and more particularly to battery packs and electric vehicles. [Background technology]

[0003] Currently, the power battery packs used in electric vehicles are mainly composed of the pack body and the battery pack itself. and a plurality of battery modules attached to the battery pack, the battery modules being arranged in a series of a plurality of battery modules. The battery array is made up of batteries, side panels are installed on both sides of the battery array, and The side plates and the end plates are fixed to the battery array. The battery modules are connected to the battery packs by means of screws, tie rods or welding. After that, it is attached to the pack body with fasteners such as screws, and the strength of the battery pack is improved. In order to raise the battery pack, it is generally necessary to install a reinforcing beam inside the battery pack. The weight of the entire battery pack increases due to the addition of structural members such as reinforcing beams and fasteners. In addition, the utilization rate of the internal space of the pack body decreases, and its energy density decreases. This structure cannot meet the demand for the range of the vehicle. The assembly process is complicated, and the batteries must first be assembled into a battery module, and then the batteries are The need to install the pond module inside the pack body increases labor and material costs. Add.

[0004] To solve the above problems, the prior utility model CN201822274851.1 includes the following: A battery module including a first battery block, a second battery block, and a liquid cooling plate is provided. The battery block and the second battery block are both made up of a plurality of single cells arranged in the horizontal direction. The cells in the battery block are arranged side by side (i.e., The two large surfaces on opposite sides of the pond are aligned vertically. The liquid cooling plate is disposed between the first and second battery blocks along the direction of the battery pack. The first and second battery blocks are attached to each other with thermally conductive adhesive. The battery module is provided with a structural member for attaching and fixing the cells. This simplifies the assembly process, but the overall size of such a battery module is The structural strength is low. In order to ensure the cooling effect of the liquid cooling plate, the cooling liquid is A receiving cavity is provided for receiving the material, and the receiving cavity has a certain thickness. However, the liquid cooling plate with this structure has low strength, so it is difficult to break it. excessive structural force to avoid short circuit of the cells due to damage and leakage of coolant Therefore, the liquid cooling plate serves as a reinforcement and support for the battery module. cannot perform its function. Summary of the Invention [Problem to be solved by the invention]

[0005] The present application relates to a device having a simple structure, being easy to assemble, and having high structural strength, high space utilization rate, and energy efficiency. The present invention aims to provide a battery pack and an electric vehicle having high energy density. [Means for solving the problem]

[0006] In order to solve the above technical problems, in one aspect, the battery pack according to the embodiment of the present application , The battery includes a case having a bottom surface and a top surface therein, and a battery module located within the case; The battery module includes a battery unit and a reinforcing member, and the battery unit includes N The number of the reinforcing members is M, and M is an integer greater than 1. At least some of the cells in the battery unit are connected to M of the reinforcing members. Each of the reinforcing members is connected to at least some of the Q adjacent cells. It is fixedly attached to the first side of the cell, and Q satisfies N>Q≧2 and is an integer. , The outer surfaces of the cells are a bottom surface facing the bottom surface of the case and a top surface facing the top surface of the case. and a side surface, the side surface being a first side surface and two opposite second side surfaces. Among the side surfaces, the first side surface has the largest area, and the area of ​​the first side surface is the area of ​​the bottom surface of the cell and the area of ​​the top surface of the cell, The cells are arranged in order, and the second side surfaces of two adjacent cells are placed opposite each other. The arrangement direction of the batteries is the first direction.

[0007] Preferably, the dimension of the reinforcing member along the second direction is D0, and the second direction is the first direction. At least one of the Q adjacent cells is connected to the reinforcing member. The dimension of each cell along the second direction is D1, and D0 and D1 are in the range of 0.006≦D0 / The condition D1≦0.5 is satisfied, and D1=10 to 90 mm.

[0008] Preferably, 0.012≦D0 / D1≦0.4.

[0009] Preferably, the number of cells connected to the reinforcing member among the Q adjacent cells is Q / 2 or greater.

[0010] Preferably, the M reinforcing members connect N cells to form a battery unit, One of the reinforcing members is fixedly attached to the first side surface of each of the Q adjacent cells. Can be attached.

[0011] Preferably, the length of the battery module along the first direction is 400 to 2500 mm. The battery module is supported by the bottom surface of the case in contact with the bottom surface of the case. can be.

[0012] Preferably, the reinforcing member is attached to the first side surface of at least one cell. The length of the projection of the cell on the first side surface along the first direction is S, and the length of the cell along the first direction is is P, where S and P satisfy S=0.1P to 0.5P.

[0013] Preferably, the M reinforcing members are located on one side of the battery module and are arranged in a predetermined direction. The first reinforcing member is arranged along the line The second reinforcing member is fixedly attached to the first side of the Qth to 2Q-1th single a third reinforcing member fixedly attached to the first side of each cell of the battery; 3Q-2nd cells are fixedly attached to the first side of each cell, By analogy, the Mth reinforcing member is M×Q-(M-1)-(Q-1)th to M×Q- It is fixedly attached to the first side surface of each of the (M-1)th cells.

[0014] Preferably, one of the reinforcing members is provided on the first side of each of two adjacent cells. It can be fixed and attached to a surface.

[0015] Preferably, the side surfaces include two opposite first side surfaces, and the M reinforcement portions The reinforcement material is distributed on both sides of the battery module, and the reinforcement material is disposed on one side of the battery module. The material is fixedly attached to one first side surface of each of the Q adjacent cells. The reinforcing member located on the other side of the battery module is It is fixedly attached to the other first side of the battery.

[0016] Preferably, the reinforcing member located on one side of the battery module is and fixedly attached to at least a portion of the surface of one first side of each of the cells. The reinforcing member located on the other side of the battery module is provided to each of the Q adjacent cells. and fixedly attached to the surface of at least a portion of the other first side surface.

[0017] Preferably, the reinforcing members located on both sides of the battery module are arranged in order along a predetermined direction. The first reinforcing member located on one side of the battery module is arranged in the order of 1st to Qth. a second reinforcing member fixedly attached to one first side surface of each of the cells; is fixedly attached to one first side surface of each of the Qth to 2Q-1th cells. By analogy, the Mth reinforcing member is M×Q-(M-1)-(Q-1)th. The adhesive tape is fixed to one first side surface of each of the M×Q-(M-1)th to M×Q-(M-1)th cells. Attached, The first reinforcing member located on the other side of the battery module is A second reinforcing member is fixedly attached to the first side of each of the other cells. 2Q--fixedly attached to the other first side surface of each of the first cells, By analogy, the Mth reinforcement member is M×Q-(M-1)-(Q-1)th to M×Q -fixedly attached to the other first side of each of the (M-1)th cells; .

[0018] Preferably, the reinforcing members located on both sides of the battery module are arranged in order along a predetermined direction. The first reinforcing member located on one side of the battery module is arranged in the order of 1st to Qth. and fixedly attached to one first side surface of each of the cells, The first reinforcing member located on the other side of the cell is connected to each of the Qth to 2Q-1th cells. a second reinforcement on one side of the battery module; The member is fixed to one first side surface of each of the 2Q-1st to 3Q-2nd cells. The second reinforcing member on the other side of the battery module is attached as follows: Q-A fixedly attached to the other first side of each of the third cells, By analogy, the M-th reinforcing member located on one side of the battery module is 2×M×Q- (2M-1)-2(Q-1)th to 2×M×Q-(2M-1)-(Q-1)th cell and fixedly attached to one first side surface of each of the cells, and The Mth reinforcing member located at is 2×M×Q-(2M-1)-(Q-1)th ~ 2×M× Affixed and attached to the other first side of each of the Q-(2M-1)th cells can be.

[0019] Preferably, the reinforcing members located on both sides of the battery module are arranged in order along a predetermined direction. The first reinforcing member located on one side of the battery module is arranged in the order of 1st to Qth. a second reinforcing member fixedly attached to one first side surface of each of the cells; is fixedly attached to one first side surface of each of the Q+1th to 2Qth cells. By analogy, the Mth reinforcing member is M×Q-(Q-1)th to M×Qth. a first electrode fixedly attached to one first side surface of each of the second cells; The first reinforcing member located on the other side of the battery module is a second reinforcing member fixedly attached to the other first side of each cell of the battery; Fix and attach to the first side of the other side of each of the +2nd to 2Q+1st cells. By analogy, the Mth reinforcing member is M×Q-(Q-1)+1th to M×Q +The first cell is fixedly attached to the other first side surface of each of the first cells.

[0020] Preferably, an extension is provided at one end of the reinforcing member, and the extension has at least one It is attached to the top or bottom of the cell.

[0021] Preferably, extensions are provided at both ends of the reinforcing member that are located on the opposite sides, and one of the extensions The extension portion is attached to the top surface of at least one of the cells, and the extension portion is attached to the top surface of at least one of the cells. It is attached to the bottom of one battery.

[0022] Preferably, the case has an X direction, a Y direction, and a Z direction which are perpendicular to each other, and the battery A plurality of modules are installed, and the plurality of battery modules are arranged in the case along the X direction. The N cells are arranged in order along the Y direction, and the top surfaces of the cells and The bottom surfaces are disposed on opposite sides along the Z direction, and the first direction is parallel to the Y direction.

[0023] Preferably, the cell is a substantially rectangular parallelepiped having a length L, a width H and a thickness D. The length L of the battery is equal to or greater than the width H, and the width H of the cell is greater than the thickness D, where The Y direction is either the length direction or the width direction of the cell. The Z direction is the other of the length direction and width direction of the cell.

[0024] Preferably, each of the cells has a bottom surface, a top surface, two first side surfaces, and two second side surfaces. The six surfaces include two first sides located opposite each other along the thickness direction and two second sides. The faces are on opposite sides along the length, and the bottom and top faces are on opposite sides along the width.

[0025] Preferably, the case includes a first frame and a second frame that are disposed opposite each other along the Y direction. a frame, and the battery module is installed between the first frame and the second frame. One end of the battery module is supported by the first frame, and The other end is supported by the second frame.

[0026] Preferably, the reinforcing member is attached to each of the Q adjacent cells by a structural adhesive. It is fixedly attached to the first side of the battery.

[0027] Preferably, the structural adhesive is a thermally conductive structural adhesive.

[0028] Preferably, the reinforcing member is a reinforcing plate.

[0029] Preferably, the reinforcing plate is a steel plate, an aluminum plate, or a glass fiber plate.

[0030] Preferably, a plurality of the battery modules are installed, and two adjacent battery modules are There is a gap between the rails.

[0031] Preferably, the second side surfaces of two adjacent cells in the battery unit are attached to each other. Can be combined.

[0032] Preferably, the battery module is installed in a plurality of locations, and at least two adjacent battery modules are installed. Reinforcement members are installed between the pond modules.

[0033] Preferably, the reinforcing member is fixed to the battery modules located on both sides of the reinforcing member. and paste it.

[0034] Preferably, the reinforcing member is an aluminum plate or a steel plate.

[0035] Preferably, the case includes a tray and a top cover which together define a storage space, and a front The battery module is located in the accommodation space, and the unit cells in the battery module are The top surface is fixedly attached to the inner surface of the upper cover, and the bottom surface is fixed to the inner surface of the tray. You can paste it by specifying the location.

[0036] Preferably, the tray and / or the top cover are of multi-layer composite construction.

[0037] Preferably, the multilayer composite structure comprises two layers of aluminum plates and a laminate of the two layers of aluminum. It includes a steel plate or foam aluminum plate sandwiched between the plates.

[0038] Preferably, the multi-layer composite structure includes two fiber composite layers and a fiber composite layer between the two fiber composite layers. and a sandwiched foam layer.

[0039] Preferably, the fiber composite layer comprises a glass fiber layer and / or a carbon fiber layer.

[0040] Preferably, a plurality of battery modules are installed, and two of each battery module are The second side surfaces of the adjacent cells are attached to each other, and the attached position is designated as the first position. The second side surfaces of two adjacent cells in the adjacent battery module are The bonding position is referred to as the second position, and the first position and the second position are referred to as the They are installed at intervals along one direction.

[0041] Preferably, a plurality of battery modules are installed, and two of each battery module are Adjacent cells are installed across the first section, and the two adjacent cells in other battery modules The two adjacent cells are installed across the second section, and the projection of the first section in the first direction and the projection of the second section in the second direction are There is no overlap with the projection of the section in the first direction.

[0042] Preferably, the number of cells in two adjacent battery modules is different, and one cell The battery module is referred to as the first battery module, and the other battery module is referred to as the second battery module. The number of cells in the first battery module is expressed as 1 / 2 the number of cells in the second battery module. the number of cells in the second battery module is greater than the number of cells in the second battery module, The connecting reinforcement blocks are installed.

[0043] In another aspect, an electric vehicle according to an embodiment of the present application includes the battery pack described above. [Effects of the Invention]

[0044] In the battery pack and the electric vehicle according to the embodiment of the present application, the reinforcing member is and fixedly attached to the first side surface of at least some of the cells, By analogy, it is possible to integrate at least some of the cells in the battery module by M reinforcing members. The area of ​​the first side surface is relatively large among the side, top and bottom surfaces of the cell. (i.e., the first side is the side with the larger area), thus forming a single This helps to ensure the adhesive area with the battery, and also helps to ensure the adhesive strength between the two. The cells in the patent are placed with their large surfaces facing the top and bottom of the case, i.e., lying flat. The cells are arranged in a horizontal direction to form a battery block. When the block receives a vertical force, the vertical force causes the battery module to move vertically. In other words, the case is deformed along the perpendicular direction to ensure that it has a certain structural strength. Therefore, it is necessary to thicken the bottom of the case or to install a reinforcing rib on the bottom of the case. However, this reduces the gravimetric or volumetric energy density of the battery pack. The top surface of the cell of the present application faces the top surface of the inside of the case, and the bottom surface faces the bottom surface of the inside of the case. That is, the cells are arranged upright in the case, and the reinforcing members are also arranged upright. When a vertical force is applied to the module, the vertical force causes the module to move along the horizontal direction. However, the peripheral wall around the case can limit the occurrence of such deformation. and connecting at least some of the cells in the battery module together using a reinforcing member. The reinforcing and supporting action of the reinforcing member improves the overall strength of the battery module. The battery module can act as a reinforcing beam within the case. Therefore, there is no need to install a separate reinforcing beam inside the case (as in the conventional technology, (The thickness of the reinforcement beams placed is at least several tens of millimeters) This allows for a significant simplification of the base structure, improving the space utilization rate of the battery pack. The reinforcing member in this application is useful for ensuring that the battery module has sufficient strength. Its relatively small thickness also helps reduce the weight of the battery pack. This helps improve the energy density of the battery pack. The cells are directly placed and arranged inside the case, and this structural design allows the cells to be attached and fixed. This not only helps reduce the overall weight of the battery pack by eliminating the structural members required to secure the battery in place, but also This simplifies the assembly process and helps reduce production costs. [Brief explanation of the drawings]

[0045] [Figure 1] 1 is a schematic diagram of a battery pack according to an embodiment of the present invention; [Figure 2] 1 is a schematic diagram of a battery module according to an embodiment of the present invention; [Figure 3] FIG. 3 is an exploded view of FIG. 2. [Figure 4] FIG. 3 is a plan view of FIG. 2. [Figure 5] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 6] FIG. 6 is an exploded view of FIG. 5. [Figure 7]1 is a schematic diagram of a battery module according to an embodiment of the present invention; [Figure 8] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 9] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 10] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 11] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 12] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 13] FIG. 1 is a plan view of a battery module according to an embodiment of the present application. [Figure 14] 1 is a schematic diagram of a battery module according to an embodiment of the present invention; [Figure 15] 1 is a schematic diagram of a battery module according to an embodiment of the present invention; [Figure 16] FIG. 1 is a schematic diagram illustrating the configuration of a cell according to an embodiment of the present invention. [Figure 17] 1 is a schematic diagram illustrating a case according to an embodiment of the present invention. [Figure 18] 1 is a schematic diagram of a battery module according to an embodiment of the present invention; [Figure 19] FIG. 2 is another schematic diagram of a battery pack according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0046] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the preferred embodiments of the present invention, examples of which are illustrated in the drawings and identified throughout. Identical or similar reference numerals indicate identical or similar parts or parts with identical or similar functions. The embodiments described below with reference to the drawings are merely illustrative and should not be construed as limiting the scope of the present application. It is intended to be illustrative and should not be construed as limiting the scope of the present application.

[0047] As shown in FIGS. 1 to 19, the embodiment of the present application includes a case 10 having a bottom surface and a top surface therein. and a battery module 200 located in the case 100. The battery module 200 includes a battery unit 201 and a reinforcing member 300. The battery 201 includes N cells 202, where N>2 and is an integer, and the reinforcing member 300 is There are M cells in the battery unit 201, where M>1 and M is an integer. The cells 202 are connected by M reinforcing members 300, and the outer surface of the cell 202 is connected to the case 10. a bottom surface 206 facing the bottom surface of the case 100; a top surface 205 facing the top surface of the case 100; and a side surface The side surfaces include a first side surface 203 and two opposite second side surfaces 204, The area of ​​the first side surface 203 is the largest among the surfaces of the battery 202. and the area of ​​the top surface 205 of the cell 202, and N The cells 202 are arranged in order, and the second side surfaces 204 of two adjacent cells 202 face each other. The arrangement direction of the cells 202 is the first direction. The electrodes 202 are fixed to the first side surfaces 203 of at least some of the adjacent cells 202. The elements are pasted together, and Q satisfies N>Q≧2 and is an integer.

[0048] For example, one reinforcing member 300 may be attached to one of three adjacent cells 202. 202, and is fixedly attached to the first side 203 of the other two cells 202. 03. Alternatively, one reinforcing member 300 may be attached to three adjacent cells 20. The first side 203 of the two cells 202 is fixedly attached to the first side 203 of the other cell. It is not attached to the first side surface 203 of the battery 202 .

[0049] Also, for example, one reinforcing member 300 may be provided for one of four adjacent cells 202. The first side 203 of the cell 202 is fixedly attached to the first side 203 of the other three cells 202. Alternatively, one reinforcing member 300 may be attached to four adjacent single electrodes. The battery 202 is fixedly attached to the first side 203 of two of the cells 202, and the other two The adhesive is not attached to the first side surface 203 of the single cell 202 .

[0050] The shape, dimensions and structure of the second side surfaces 204 located on the two opposite sides of the cell 202 are , may be the same or different. It may be the entire surface or a part of the surface of the first side surface 203. In the battery pack 10, the reinforcing member 300 is provided between the adjacent cells 202 of the Q number of cells 202. The battery 202 is fixedly attached to the first side surface 203 of at least some of the cells 202. In other words, the M reinforcing members 300 can The cells 202 can be connected together, and the side, top, and bottom surfaces of the cells 202 can be The area of ​​the first side surface 203 is relatively large (i.e., the first side surface 203 has a large area). In this way, the adhesive area between the reinforcing member 300 and the unit cell 202 can be ensured. This helps to ensure the adhesive strength between the two. The large surface faces the top and bottom of the case, i.e., is placed horizontally, and the cells 202 When a battery block formed by arranging these in order along the horizontal direction is subjected to a vertical force, The vertical force tends to deform the battery module 200 in the vertical direction. , the bottom of the case is thickened or reinforced to ensure that the case has a certain structural strength. However, this requires the installation of a reinforcing rib at the bottom of the case. The unit cell 202 of the present application has the following characteristics: The top surface faces the top surface inside the case, and the bottom surface faces the bottom surface inside the case. That is, the single cell 202 The battery module 20 is disposed upright in the case, and the reinforcing member is also disposed upright. When a vertical force is applied to a surface, it deforms along the horizontal direction due to the vertical force. However, the peripheral wall around the case can limit the occurrence of such deformation. At least some of the cells 202 in the battery module 200 are connected together by a material. The reinforcing and supporting action of the reinforcing member can improve the overall strength of the battery module 200. The battery module 200 acts as a reinforcing beam inside the case, and This eliminates the need to install a separate reinforcing beam inside the case (as in the conventional technology). The thickness of the reinforcing beams installed inside the case is at least several tens of millimeters), In this way, the structure of the case can be greatly simplified, and the space utilization of the battery pack 10 can be improved. The reinforcing member in the present application helps to improve the battery module 200 has sufficient strength and its thickness is relatively small, a few millimeters. Since the battery pack 10 is only a battery pack, it helps to reduce the weight of the battery pack 10 and This helps to improve the energy density. With this structural design, the cells 202 are arranged and fixed in place. This not only helps reduce the overall weight of the battery pack 10 but also reduces the structural components required for the battery pack 10. , the assembly process can be simplified, which helps to reduce production costs.

[0051] In this specification, the case 100 of the battery pack 10 is a case for housing the battery module 200. It may be understood as a case for containing the tray 101 and the top cover ( The tray 101 and the top cover together form the battery module 200 For example, the tray and the top cover are hermetically connected. The battery module 200 is placed on the tray 101 and is covered with an upper cover. The number of battery modules 200 in the case 100 can be adjusted according to actual needs. The battery pack 10 may be configured with two or three battery management systems. At least one of the following: battery management system (BMS), battery connector, battery sampler, and battery thermal management system Also includes one.

[0052] In one embodiment, the dimension of the reinforcing member 300 along the second direction is D0, and the second direction is One of the units is perpendicular to the first direction and fixedly attached to the reinforcing member 300. The weight of the battery 202 is G, and D0 and G are 0.15 mm kg -1 <D0 / G<7 mm kg -1 The above condition is satisfied, and D0 = 0.5 to 5 mm. , not only ensures that the battery module 200 has sufficient strength, but also ensures that the reinforcing member 30 The thickness of the battery pack 10 can be reduced, the weight of the battery pack 10 can be reduced, and the energy consumption of the battery pack 10 can be reduced. It helps to improve energy density.

[0053] Furthermore, 0.25 mm·kg -1 ≦D0 / G≦5.8mm·kg-1 This is By installing the battery module in , the thickness of the reinforcing member 300 can be reduced, reducing the weight of the battery pack 10 and This helps improve the energy density of the pack.

[0054] In the embodiment, the dimension of the reinforcing member along the second direction is D0, and the second direction is the first direction The Q adjacent cells 202 are perpendicular to the reinforcing member 300. The dimension of the cell 202 in the second direction is D1, and D0 and D1 are in the range of 0.006≦D The condition 0 / D1≦0.5 is satisfied, and D1=10~90mm. This not only prevents the thickness of the cell 202 from becoming too large, but also High adhesive strength with the pond 202 can be ensured.

[0055] Furthermore, 0.012≦D0 / D1≦0.4, so that the thickness of the cell 202 It is not too large and ensures a higher adhesive strength between the cell 202 and the reinforcing member 300. It is possible.

[0056] In the embodiment, the cells 202 connected to the reinforcing member 300 among the Q adjacent cells 202 The number of cells 202 is equal to or greater than Q / 2. For example, the number of cells 202 is equal to or greater than Q / 2. The number of cells 202 connected to the reinforcement member 300 is two or three. The number of the cells 202 connected to the reinforcing member 300 is two, three, or There are four.

[0057] In one embodiment, M reinforcing members 300 connect N cells 202 to form a battery unit. The reinforcing member 300 is attached to each of the Q adjacent cells 202. It is fixedly attached to the first side surface 203 of the cell 202 .

[0058] One reinforcing member 300 is attached to the first one of each of the Q adjacent cells 202. By analogy, M reinforcing members 300 are fixedly attached to the side surface 203. The N cells 202 in the battery unit 201 can be connected together, thereby This further improves the overall strength of the battery module 200. Since it can act as a reinforcing beam within the case 100, the structure of the case 100 can be greatly improved. The width can be simplified and the space occupied by the reinforcing ribs can be reduced, thereby reducing the space in the battery pack 10. This helps to improve the utilization rate and the energy density of the battery pack 10. The module 200 is directly arranged and aligned within the case 100. Therefore, structural members for attaching and fixing the cells 202 are omitted, and the entire battery pack 10 Not only does it help reduce weight, it also simplifies the assembly process and reduces production costs. This helps reduce costs.

[0059] In one embodiment, the length of the battery module 200 in the first direction is 400 to 2500 mm. mm, and the battery module 200 abuts against the bottom surface inside the case 100 The bottom surface of the

[0060] The reinforcing member 300 connects the cells 202 in the battery module 200 together. The reinforcing and supporting action of the reinforcing member 300 can improve the overall strength of the battery module 200. The battery module 200 has a reinforcing beam in the case 100, which can improve the strength. Therefore, the structure of the case 100 can be greatly simplified and the reinforcing ribs This reduces the space occupied by the battery pack 10, thereby improving the space utilization rate of the battery pack 10 and the battery pack 10. This helps to improve the energy density of the battery module 200. 00, and such a structural design allows the single cell 202 to be mounted. The structural members for fixing are omitted, which helps to reduce the weight of the entire battery pack 10. It also simplifies the assembly process and helps reduce production costs. .

[0061] Furthermore, the length of the battery module 200 along the first direction can be adjusted to meet the needs of use. It is 600 to 2500 mm.

[0062] In one embodiment, the battery unit 201 includes four cells 202. However, the number of cells 202 included in the battery unit 201 is set according to actual needs. For example, there may be three or five or more.

[0063] In one embodiment, as shown in FIG. 2, one reinforcing member 300 is formed by two adjacent single electrodes. The battery 202 is fixedly attached to the first side 203 of each cell 202 .

[0064] In another embodiment, as shown in FIG. 8, one reinforcing member 300 is formed by three adjacent single It is fixedly attached to the first side surface 203 of each cell 202 of the battery 202 .

[0065] In one embodiment, the reinforcing member 300 is attached to each of the Q adjacent cells 202. 202 is fixedly attached to at least a portion of the surface of the first side 203 of the substrate 202.

[0066] As shown in FIG. 2, the reinforcing member 300 is attached to each of two adjacent cells 202. The adhesive layer 202 is fixedly attached to at least a part of the surface of the first side 203 of the adhesive layer 202. A reinforcing member 300 is fixed to a surface of a part of the first side surface 203 of two adjacent unit cells 202. It should be understood that the reinforcing member 300 is attached to the first side surface of one of the cells 202. The other cell 202 is fixed to the entire surface of the first side surface 203 of the other cell 202 and to a part of the surface of the first side surface 203 of the other cell 202. It may be attached.

[0067] However, in another embodiment, as shown in FIG. 8, the reinforcing member 300 may be formed by three adjacent On at least a part of the surface of the first side surface 203 of each of the adjacent cells 202 Then, two of the three adjacent cells 202 are fixedly attached. A part of the surface of the first side 203 of one cell 202 and the entire surface of the first side 203 of one cell 202 The reinforcing member 300 is fixedly attached to the body. Even if the reinforcing member 300 is fixedly attached to a part of the surface of the first side surface 203 of the battery 202, good.

[0068] In one embodiment, as shown in FIGS. 2 and 8, M reinforcing members 300 are provided in the battery module. The first reinforcing member 300 is located on one side of the roll 200 and is arranged in order along a predetermined direction. is fixed to the first side surface 203 of each of the first to Qth cells 202. The second reinforcing member 300 is attached to the Q-th to 2Q-1-th cells 202. The third reinforcing member 300 is fixedly attached to the first side surface 203 of each of the cells 202. , the first side surface 203 of each of the cells 202 among the 2Q-1st to 3Q-2nd cells 202 By analogy, the Mth reinforcing member 300 is fixedly attached to the Each of the cells 202 among the (M-1)-(Q-1)th to (M×Q-(M-1))th cells 202 02 is fixedly attached to the first side surface 203 of the

[0069] The predetermined direction may be parallel to the first direction or may form a certain angle with the first direction. .

[0070] As shown in FIG. 2, the battery unit 201 includes four cells 202 and three reinforcing members. The reinforcing members 300 are located on one side of the battery module 200, and each reinforcing member 300 is located between two adjacent The adhesive tape 202 is fixedly attached to the first side surface 203 of each of the cells 202. The second reinforcing member 300 is provided on the first side of each of the first and second cells 202. The second reinforcing member 300 is fixedly attached to the side surface 203, and the second reinforcing member 300 is fixed to the second and third single electrodes. a third auxiliary battery 202 fixedly attached to the first side 203 of each cell 202 of the battery 202; The reinforcing member 300 is provided on the first side surface 20 of each of the third and fourth cells 202. 3. Can be fixed and attached.

[0071] As shown in FIG. 8, the battery unit 201 includes five cells 202 and two reinforcing members. The reinforcing members 300 are located on one side of the battery module 200, and each reinforcing member 300 is connected to three adjacent The adhesive tape 202 is fixedly attached to the first side surface 203 of each of the unit cells 202. The third reinforcing member 300 is provided on the first side of each of the first to third cells 202. The second reinforcing member 300 is fixedly attached to the side surface 203, and the third to fifth single electrodes The battery 202 is fixedly attached to the first side 203 of each cell 202 .

[0072] In one embodiment, as shown in Figures 6 and 7, the side surfaces are formed by two opposing first The M reinforcing members 300 are distributed on both sides of the battery module 200, including the side surface 203. The reinforcing member 300 located on one side of the battery module 200 is The battery module is fixedly attached to one first side surface 203 of each of the cells 202. The reinforcing member 300 located on the other side of the Q adjacent cells 202 The battery unit 202 is fixedly attached to the other first side surface 203 of the battery unit 202. The number of Q's is not specifically limited, and may be 2, 3 or more. That's fine.

[0073] In addition, the reinforcing member 300 located on one side of the battery module 200 is 202 is fixedly attached to one first side surface 203 of each of the unit cells 202. , the reinforcing member 300 is attached to one first side of each of the Q adjacent cells 202. It may be understood that the adhesive layer 204 may be fixedly attached to the entire surface or a portion of the surface 203. The reinforcing member 300 located on the other side of the battery module 200 supports the Q adjacent cells 20 The other side surface 203 of each of the two cells 202 is fixedly attached to the other side surface 203. The reinforcement member 300 is attached to the other first side surface 2 of each of the Q adjacent cells 202. It may be understood that the adhesive layer 100 may be fixedly attached to the entire surface or a part of the surface of the adhesive layer 100.

[0074] In one embodiment, the reinforcing member 300 located on one side of the battery module 200 is At least a portion of one of the first side surfaces 203 of each of the adjacent cells 202 The reinforcing member 300 is fixedly attached to the surface of the battery module 200 and is located on the other side of the battery module 200. is the number of adjacent cells 202. It can be fixed and attached to at least some surfaces.

[0075] As shown in FIG. 6, the reinforcing member 300 located on one side of the battery module 200 has two At least a portion of one of the first side surfaces 203 of each of the adjacent cells 202 The reinforcing member 30 located on the other side of the battery module 200 is fixedly attached to the surface of the battery module 200. 0 is the smallest part of the first side surface 203 of each of the two adjacent cells 202. The adhesive can be fixedly attached to at least some of the surface.

[0076] However, in another embodiment, as shown in FIG. The reinforcing member 300 positioned at the center of each of the three adjacent cells 202 is The battery module is fixedly attached to at least a part of the surface of the first side surface 203 of the battery module. The reinforcing member 300 located on the other side of the cell 200 supports each of the three adjacent cells 202. It is fixedly attached to the surface of at least a part of the other first side surface 203 of the pond 202 .

[0077] As shown in FIGS. 5, 6 and 9, the reinforcing members 3 located on both sides of the battery module 200 00 indicates the number 1 located on one side of the battery module 200, arranged in order in a predetermined direction. The reinforcing member 300 is provided on one side of each of the first to Qth cells 202. The second reinforcing member 300 is fixedly attached to the first side surface 203, and the second reinforcing member 300 is Q-th to 2Q-1 and fixedly attached to one first side surface 203 of each of the cells 202. By analogy, the Mth reinforcing member 300 is M×Q−(M−1)−(Q−1 One first side of each of the M×Q-(M-1)th to M×Q-(M-1)th cells 202 is fixedly attached to the surface 203, The first reinforcing member 300 located on the other side of the battery module 200 is and fixedly attached to the other first side surface 203 of each of the unit cells 202, The second reinforcing member 300 is provided for each of the Qth to 2Q-1th cells 202. 2, and by analogy, the M-th reinforcement The member 300 is composed of the M×Q-(M-1)-(Q-1)th to M×Q-(M-1)th cells. The battery 202 is fixedly attached to the other first side surface 203 of each of the unit cells 202 .

[0078] In this embodiment, as shown in FIGS. 5 and 6, the battery unit 201 includes four single cells. The three reinforcing members 300 are located on one side of the battery module 200, and each reinforcing member The member 300 is attached to one of the first side surfaces 22 of each of the two adjacent cells 202. The three reinforcing members 300 are fixedly attached to the other side of the battery module 200. Each reinforcing member 300 is located at the center of each of the two adjacent cells 202. The battery module 200 is fixed to the first side surface 203. The first reinforcing member 300 is attached to one of the first and second cells 202. The second reinforcing member 300 is fixedly attached to the first side surface 203, and the second reinforcing member 300 is attached to the second to third fixedly attached to one first side surface 203 of each of the cells 202; The third reinforcing member 300 is provided on one of the third and fourth cells 202. The first side surface 203 of the battery module 200 is fixedly attached to the first side surface 203 of the battery module 200. The second reinforcing member 300 is provided on the other first side of each of the first and second cells 202. The second reinforcing member 300 is fixedly attached to the side surface 203, and the second reinforcing member 300 is fixed to the second and third single electrodes. The battery 202 is fixedly attached to the other first side surface 203 of each of the cells 202, and the third The reinforcing member 300 is provided on the other side of each of the third and fourth cells 202. It is fixedly attached to the first side surface 203 .

[0079] However, in another embodiment, as shown in FIG. 9, the battery unit 201 may include five The battery module 200 includes two single cells 202. Two reinforcing members 300 are located on one side of the battery module 200. Each reinforcing member 300 is attached to one of the three adjacent cells 202. The two reinforcing members 300 are fixedly attached to the side surfaces 203 of the battery module 20. 0, and each reinforcing member 300 is located on the other side of each of the three adjacent cells 202. The battery module 200 is fixedly attached to the other first side surface 203 of the battery module 202. The first reinforcing member 300 positioned at the first to third cells 202 The second reinforcing member 300 is fixedly attached to one first side 203 of the first reinforcing member 202. The second to fifth cells 202 are fixed to one first side surface 203 of each cell 202. The first reinforcing member 300 attached to the other side of the battery module 200 is number 1. The second to third cells 202 are fixed to the other first side surface 203 of each cell 202. The second reinforcing member 300 is attached to each of the third to fifth cells 202. It is fixedly attached to the other first side surface 203 of the pond 202 .

[0080] As shown in FIGS. 10 and 11, the reinforcing members 30 located on both sides of the battery module 200 0 indicates the first battery module 200 arranged in order along a predetermined direction and located on one side of the battery module 200. The reinforcing member 300 is attached to one of the first to Qth cells 202. The first battery module 200 is fixedly attached to the first side 203 of the battery module 200. The reinforcing member 300 is provided on the other side of each of the Qth to 2Q-1th cells 202. The second reinforcement on one side of the battery module 200 is fixedly attached to the first side 203 of the battery module 200. The member 300 is a part of each of the 2Q-1st to 3Q-2nd cells 202. The battery module 200 is fixedly attached to the first side surface 203 of the battery module 200, and the second auxiliary battery module 202 is fixedly attached to the second side surface 203 of the battery module 200. The reinforcing member 300 is provided for each of the 3Q-2nd to 4Q-3rd cells 202. The battery module 2 is fixedly attached to the first side surface 203 of the other side. The M-th reinforcing member 300 located on one side of 00 is 2×M×Q−(2M−1)−2(Q− Each of the 1)th to 2×M×Q-(2M-1)-(Q-1)th cells 202 202 is fixedly attached to the first side 203 of the battery module 200, and The Mth reinforcing member 300 located is 2×M×Q−(2M−1)−(Q−1)th to 2× The other first side surface 20 of each of the M×Q−(2M−1)-th cells 202 3. Can be fixed and attached.

[0081] In this embodiment, as shown in FIG. 10, the battery unit 201 includes five cells 202. The two reinforcing members 300 are located on one side of the battery module 200. 00 is attached to one first side surface 203 of each of the two adjacent cells 202. The two reinforcing members 300 are fixedly attached to the other side of the battery module 200. However, each reinforcing member 300 is connected to the other of the two adjacent cells 202. The battery module 200 is fixed to the first side surface 203. The reinforcing member 300 is provided on one first side of each of the first and second cells 202. a first reinforcement fixedly attached to the surface 203 and located on the other side of the battery module 200; The member 300 is attached to the other first side surface of each of the second and third cells 202. The second reinforcement is fixedly attached to the battery module 203. The member 300 is attached to one first side surface of each of the third and fourth cells 202. 203 and a second reinforcing portion located on the other side of the battery module 200. The member 300 is provided on the other first side surface 2 of each of the fourth and fifth cells 202. It can be fixed and pasted to 03.

[0082] However, in another embodiment, as shown in FIG. 11, the battery unit 201 may be The battery module 200 includes two cells 202, and two reinforcing members 300 are located on one side of the battery module 200. However, each reinforcing member 300 is attached to one of the three adjacent cells 202. The reinforcing member 300 is fixedly attached to the first side surface 203 of the battery module 2. 00, and the reinforcing member 300 is located on the other side of each of the three adjacent cells 202. The battery module 200 is fixedly attached to the other first side surface 203 of the battery 202. The first reinforcing member 300 located on the side of the first to third cells 2, and is fixedly attached to the first side surface 203 of the battery module 200. The first reinforcing member 300 is attached to each of the third to fifth cells 202. The battery module 200 is fixed to the first side surface 203 of the battery module 200. The second reinforcing member 300 is connected to each of the fifth to seventh cells 202. The first side surface 203 is fixedly attached to the first side surface 203.

[0083] As shown in FIGS. 12 and 13, the reinforcing members 30 located on both sides of the battery module 200 0 indicates the first battery module 200 arranged in order along a predetermined direction and located on one side of the battery module 200. The reinforcing member 300 is attached to one of the first to Qth cells 202. The second reinforcing member 300 is fixedly attached to the first side surface 203, and the second reinforcing member 300 is attached to the second side surface 203. The battery 202 is fixedly attached to one first side surface 203 of each of the batteries 202. By analogy, the Mth reinforcing member 300 is M×Q−(Q−1)th to M×Q and fixedly attached to one first side surface 203 of each of the cells 202. and The first reinforcing member 300 located on the other side of the battery module 200 is numbered 2 to Q+1. The other first side surface 203 of each of the other cells 202 is fixedly attached. The second reinforcing member 300 is provided for each of the Q+2th to 2Q+1th cells 202. The battery 202 is fixedly attached to the other first side surface 203 of the battery 202. The reinforcing member 300 is formed between the M×Q−(Q−1)+1th to the M×Q+1th cells 202. The other first side surface 203 of each of the cells 202 is fixedly attached thereto.

[0084] In this embodiment, as shown in FIG. 12, the battery unit 201 includes five cells 202. The two reinforcing members 300 are located on one side of the battery module 200. 00 is attached to one first side surface 203 of each of the two adjacent cells 202. The two reinforcing members 300 are fixedly attached to the other side of the battery module 200. However, each reinforcing member 300 is connected to the other of the two adjacent cells 202. The battery module 200 is fixed to the first side surface 203. The reinforcing member 300 is provided on one first side of each of the first and second cells 202. The second reinforcing member 300 is fixedly attached to the surface 203 of the third and fourth cells. 202, and is fixedly attached to one first side surface 203 of each of the unit cells 202, The first reinforcing member 300 located on the other side of the module 200 is connected to the second and third cells 2 202, and the second The reinforcing member 300 is provided on the other first side of each of the fourth and fifth cells 202. It is fixedly attached to the side surface 203 .

[0085] However, in another embodiment, as shown in FIG. 13, the battery unit 201 may include four The battery module 200 includes two cells 202, and two reinforcing members 300 are located on one side of the battery module 200. However, each reinforcing member 300 is attached to one of the two adjacent cells 202. The reinforcing member 300 is fixedly attached to the first side surface 203 of the battery module 2. 00, and the reinforcing member 300 is located on the other side of each of the two adjacent cells 202. The battery module 200 is fixedly attached to the other first side surface 203 of the battery 202. The first reinforcing member 300 located on the side of the first and second cells 20 The second reinforcing member 300 is fixedly attached to the first side 203 of one of the first and second reinforcing members 201 and 202. The adhesive tape is fixed to one of the first side surfaces 203 of each of the four cells 202. The first reinforcing member 300 located on the other side of the battery module 200 is The other first side surface 203 of each of the third cells 202 is fixedly attached. It can be done.

[0086] In one embodiment, as shown in Figures 2 and 14, an extension 400 is provided at one end of the reinforcing member 300, and the extension 400 is attached to the top surface 205 or the bottom surface 206 of at least one cell 202, thereby further improving the strength of the battery unit 201. For example, the extension 400 may be attached to the top surface 205 or the bottom surface 206 of one cell 202. stomach .

[0087] In this embodiment, the reinforcing member 300 is integrally formed with the extension portion 400. However, the reinforcing member 300 and extension 400 may be fabricated separately and then connected.

[0088] In one embodiment, as shown in FIGS. 2 and 15, the reinforcing member 300 is located on the opposite side of the reinforcing member 300. The extensions 400 are provided on both ends, and one of the extensions 400 is connected to at least one of the cells 202. The other extension 400 is attached to the bottom surface of at least one cell 202. By attaching the battery unit 201 to the battery pack 206, the strength of the battery unit 201 is further improved. For example, one extension 400 is attached to the top surface 205 of one cell 202, and the other The extension 400 is attached to the bottom surface 206 of one of the cells 202. The extension portion 400 is attached to the top surface 205 of the two cells 202, and the other extension portion 400 is , are attached to the bottom surfaces 206 of the two cells 202 .

[0089] In one embodiment, as shown in FIGS. 1 and 2, the case 100 is configured such that the X direction is perpendicular to the X direction. , Y direction and Z direction, and a plurality of battery modules 200 are installed. The coils 200 are arranged in the case 100 along the X direction, and the N cells 202 are arranged in the Y direction. The top surface 205 and the bottom surface 206 of the cells 202 are arranged oppositely along the Z direction. The first direction is parallel to the Y direction, and the second direction is parallel to the X direction. is.

[0090] In one embodiment, as shown in FIGS. 2, 16, and 17, the cell 202 is a substantially rectangular parallelepiped. and has a length L, a width H and a thickness D, and the length L of the cell 202 is equal to or greater than the width H, The width H of the cell 202 is greater than the thickness D, and the X direction is the thickness direction of the cell 202. The Y direction is either the length direction or the width direction of the cell 202, and the Z direction is the width direction of the cell 202. The dimension of the cell 202 along the second direction is the other of the length direction and width direction of the cell 202. is the thickness of the battery 202, i.e., D1=D.

[0091] In this specification, the fact that the cell 202 is a substantially rectangular parallelepiped means that the cell 202 is a rectangular parallelepiped. It may be rectangular or cubic, and although there may be local irregularities, it is generally rectangular or cubic. It may have some notches, protrusions, chamfers, curvatures, and bends, but the overall shape It may be understood that the shape may be substantially rectangular or cubic.

[0092] Each cell 202 has a bottom surface 206, a top surface 205, two first side surfaces 203, and two The first side 203 includes six surfaces of the second side 204, and the two first side 203 are opposite to each other along the thickness direction. The two second sides 204 are located on opposite sides along the length and have a bottom surface 206 and a top surface 207. The faces 205 are located on opposite sides along the width direction.

[0093] The case 100 is made up of a first frame 102 and a second frame 103 that are arranged opposite each other along the Y direction. The battery module 200 includes a first frame 102 and a second frame 103. One end of the battery module 200 is supported by the first frame 102, and the battery The other end of the module 200 is supported by the second frame 103. 200 extends from the first frame 102 to the second frame 103 along the Y direction. In this case, the battery module 200 extends from one side of the case 100 to the other side along the Y direction. One battery module 200 is installed in the case 100 along the Y direction.

[0094] The reinforcing member 300 is fixed and attached to the first side surface 203 of the unit cell 202, The batteries 202 are connected together, and the reinforcing and supporting functions of the reinforcing member 300 form a battery module. The overall strength of the battery module 200 can be improved. This allows the case structure to be greatly simplified and the In addition, the space occupied by the reinforcing ribs can be reduced, improving the space utilization rate of the battery pack 10 and the battery This helps to improve the energy density of the pack 10. In addition, the battery module 200 , are directly disposed and arranged in the case 100, and by such a structural design, the single cells 202 The structural members for attaching and fixing the battery pack 10 are omitted, and the weight of the entire battery pack 10 is reduced. This not only helps to simplify the assembly process but also reduces production costs. and useful.

[0095] In this embodiment, one end of the battery module 200 is directly or Alternatively, the other end of the battery module 200 may be directly supported by the second frame 103. The battery module 200 may be directly or indirectly supported. The other end of the battery module 200 is directly in contact with the second frame 102 and is fitted and supported thereon. 03 means that it is directly in contact with and supported by the connector. Indirect means that it is in direct contact with and supported by the connector. In this example, one end of the battery module 200 is fitted and supported to the first frame 102 by an intermediate member. The other end of the battery module 200 is fitted and supported by the second frame 103 via an intermediate member. Furthermore, both ends of the battery module 200 are connected to the first frame 102 and The second frame 103 may be fixed thereto, and the specific fixing method will be described in detail below. The present application is not limited to any particular support or fixation method.

[0096] In one embodiment, the technical concept of the present application is such that the first frame 102 and the second frame 103 are arranged along the Y direction. The distance between the two frames 103 matches the dimensions of the battery module 200, where The matching is performed by fitting one battery module 200 into the space between the two frames. For purposes of this application, such engagement is not intended to be a gap. Various fitting methods may be used, such as a loose fit, an interference fit, a fastening fit, or a locking fit.

[0097] Furthermore, the case 100 includes a third frame 104 and a second frame 105 that are disposed opposite each other along the X direction. The battery module 200 further includes a fourth frame 105, and the battery module 200 is arranged in a third direction along the X direction. They are arranged in parallel between the frame 104 and the fourth frame 105 .

[0098] The case 100 includes a tray 101 and a top cover that together define a storage space. The battery module 200 is located in the accommodation space, and the cells 202 in the battery module 200 are The top surface is fixedly attached to the inner surface of the upper cover, and the bottom surface is fixed to the inner surface of the tray 101. As a result, the battery module 200, the upper cover, and the tray 10 are fixed in place and attached. 1 can form an integral structure, which has high mechanical strength, i.e. That is, the battery pack 10 has high structural strength and can withstand external shocks. The battery pack 10 has sufficient structural strength during use, and therefore contributes to the structural strength of the entire vehicle. In other words, contrary to conventional design concepts, the entire vehicle can be electrically There is no need to design a separate structural member to protect the battery pack 10. This design can improve the structural strength of the entire vehicle. The design structure for protecting the structural strength of the battery pack 10 in the frame is simplified, and This allows for further reduction in overall vehicle weight, and allows for the overall vehicle design and manufacturing to be simplified. This helps reduce manufacturing costs and improve overall vehicle production efficiency.

[0099] The inner surface of the upper cover refers to the surface of the upper cover that is closer to the cell 202. The inner surface of the tray 101 refers to the surface of the tray 101 that is closer to the cell 202. The top surface of the cell 202 in the module 200 is directly fixed to the inner surface of the top cover. It may be attached to the inner surface of the upper cover, or may be indirectly fixedly attached to the inner surface of the upper cover, For example, the top surface of the cell 202 in the battery module 200 is fixed to one side of the connection plate. The other side of the connecting plate is fixedly attached to the inner surface of the upper cover. The bottom surface of the cell 202 in the battery module 200 is directly in contact with the inner surface of the tray 101. The tray 101 may be fixedly attached to the inner surface of the tray 101, or may be fixedly attached indirectly to the inner surface of the tray 101. For example, the bottom surface of the cell 202 in the battery module 200 may be connected to one of the connection plates. The other side of the connecting plate is fixedly attached to the inner surface of the tray 101. can be done.

[0100] In this embodiment, the tray 101 is mounted on a first frame 102 facing each other along the Y direction. 102 and the second frame 103, and the third frame 10 4 and fourth frame 105.

[0101] In one embodiment, the first frame is used to form the case 100 into a rectangular or square shape. The second frame 102 and the second frame 103 are perpendicular to the third frame 104 and the fourth frame 105. In other embodiments, the case 100 may be formed into a trapezoid, a parallelogram, or the like. Therefore, the first frame 102 and the second frame 103 may be parallel to each other, and the third frame The first frame 102 and the second frame 103 are connected to the fourth frame 104 and the fourth frame 105. The first frame 102, the second frame 103, and the third frame 104 may be installed at an angle. The specific shape of the case 100 composed of the third frame 104 and the fourth frame 105 is not limited. Not fixed.

[0102] In some embodiments of the present application, the third frame 104 is adjacent to the third frame 104. The battery module 200 is placed in a position opposite to the fourth frame 105, and a force acting toward the fourth frame 105 is applied to the battery module 200. The fourth frame 105 is provided adjacent to the battery module 2. By applying a force toward the third frame 104 to the battery module 100, The module 200 is densely arranged between the third frame 104 and the fourth frame 105 along the X direction. The battery modules 200 can be arranged and attached to each other. The third frame 104 and the fourth frame 105 are arranged such that a plurality of battery modules are arranged in the X direction. In particular, the battery module 200 can be prevented from slightly expanding. In this case, it acts to provide a buffer and inward pressure to the battery module 200. This can prevent the battery module 200 from expanding or deforming too much.

[0103] To further improve the structural strength of the battery pack 10, the top cover is made of a multi-layer composite structure. The multi-layer composite structure is made up of two aluminum plates and a sheet sandwiched between them. Alternatively, the multi-layer composite structure may include two layers of aluminum plates and two layers of aluminum Alternatively, the multi-layer composite structure may include two layers of fiber composite. The fiber composite layer is made of glass fiber and the foam material layer is sandwiched between two fiber composite layers. The laminated body includes a fiber layer and / or a carbon fiber layer.

[0104] To further improve the structural strength of the battery pack 10, the tray 101 also has a multi-layer composite structure. The multi-layer composite structure is made up of two aluminum plates and a sheet sandwiched between them. Alternatively, the multi-layer composite structure may include two layers of aluminum plates and two layers of aluminum Alternatively, the multi-layer composite structure may include two layers of fiber composite. The fiber composite layer is made of glass fiber and the foam material layer is sandwiched between two fiber composite layers. The laminated body includes a fiber layer and / or a carbon fiber layer.

[0105] In one embodiment, the reinforcing member 300 is a reinforcing plate, and the reinforcing member 300 is The dimension is the thickness of the reinforcing plate. Note that the reinforcing member 300 is not limited to a plate-like structure, and may be other In order to further improve the strength, a reinforcing rib may be provided on the plate-like structure. good.

[0106] Furthermore, the reinforcing plate is a steel plate, an aluminum plate, or a glass fiber plate.

[0107] In one embodiment, as shown in FIGS. 2 and 3, the reinforcing member 300 is made of a structural adhesive 50 0 to the first side surface 203 of each of the Q adjacent cells 202. Here, the number of Q is not specifically limited, and may be, for example, three or four. do.

[0108] Furthermore, the structural adhesive 500 is a structural adhesive 500 that has thermal conductivity. The structural adhesive 500 having adhesive properties is used to bond the reinforcing member 300 to the first side surface 203 of the cell 202. It not only ensures a high adhesive effect but also conducts heat generated during the operation of the cell 202. can be done.

[0109] As shown in FIGS. 2 to 4, the adhesive layer 202 is attached to the first side surface 203 of at least one cell 202. the length of the reinforcing member 300 projected onto the first side surface 203 of the cell 202 along the first direction is S, and the length of the cell 202 along the first direction is P, where S and P are , S=0.1P to 0.5P is satisfied. By setting it in this way, the reinforcing member 300 and This ensures a high adhesive effect between the first side surface 203 of the cell 202. It is possible to ensure that there is a constant distance W between any two adjacent reinforcing members 300. The distance W can buffer the expansion of the cell 202 during operation. In this way, there is no need to leave gaps between adjacent battery modules 200 in advance, and the battery This helps to improve the space utilization rate of the pond pack 10.

[0110] The first direction is parallel to the Y direction. The length P of the cell 202 along the first direction is The length of 02 is L.

[0111] In this embodiment, the battery unit 201 includes four cells 202 and a reinforcing member 30. The length of the projection of each cell 202 onto the first side surface 203 along the first direction is S. However, according to actual needs, only one cell 202 or two cells 202 may be used. The projection of the first side surface 203 of the mirror 202 along the first direction may have a length S.

[0112] In one embodiment, there is a gap between two adjacent battery modules 200, and the gap is , which allows expansion that occurs during operation of the cells 202. To conduct heat, the gap may function as a cooling air passage, and a liquid cooling plate may be installed in the gap. good.

[0113] In one embodiment, to meet actual usage needs, the battery unit 201 is connected in series. , parallel connection or series-parallel connection, and the cells 202 in the battery unit 201 are connected in series. , connected in parallel or in series / parallel.

[0114] In one embodiment, as shown in FIGS. 1 and 2, the battery pack 10 includes a power connection member 60 0, and the single cells 202 in the battery unit 201 are connected by the power connection member 600. The power supplies are connected in series or in parallel.

[0115] Furthermore, in order to easily place the battery module 200 in the case 100, the cells 20 The electrode terminal 207 of the cell 202 is attached to the top surface 205 of the cell 202. Two terminals 207 are installed, one is a positive terminal and the other is a negative terminal.

[0116] In one embodiment, the battery modules 200 are installed in a plurality of locations, each of which is adjacent to at least two other battery modules. The reinforcing members are installed between the battery modules 200. The reinforcing member can further improve the strength of the battery module 200. This can improve the structural strength of the pack 10. The number of battery modules 200 can be adjusted The number may be set as needed, for example, two, three, or four. Three battery modules 200 are installed, and the first battery a reinforcing member is provided between the module 200 and a second battery module 200; or , the second battery module 200 and the third battery module 200 are aligned in the direction of the arrangement of the battery modules 200. A reinforcing member is installed between the first battery module 200, or Between the 0th and second battery modules 200, and between the second battery module 200 and the third A reinforcing member is installed between each of the battery modules 200. The battery modules 200 are fixedly attached to both sides of the reinforcing member. The structural adhesive provides a strong bond between the two. Not only does it guarantee the heat transfer function, but it also serves the function of heat conduction.

[0117] Furthermore, the reinforcing member is a reinforcing plate, and the reinforcing plate is a solid structure, for example, a solid aluminum It is an aluminum plate or a steel plate.

[0118] In one embodiment, a plurality of battery modules 200 are installed, and one battery module 2 Two adjacent cells 202 in 00 are installed across a first section, and adjacent cells 202 are Two adjacent cells 202 in the battery module 200 are arranged with a second section between them. Therefore, the projection of the first section in the first direction and the projection of the second section in the first direction do not overlap. The size of the first section and the size of the second section may be the same or different. Depending on the method, the structural strength of one battery module is relatively low (i.e., the position in the first section). The position where the structural strength of the adjacent battery modules is relatively low (i.e., the position in the second section) The battery module can be displaced from one another, thus improving the structural strength of the battery module. The relatively low position of the battery module can be compensated for by other adjacent battery modules. This helps improve the overall strength of the battery pack.

[0119] For example, in one battery module 200, the first unit arranged along the first direction The battery 202 and the second cell 202 are installed across the first section, and the battery module 2 The first battery module 200 arranged along the first direction in another battery module 200 adjacent to the first battery module 200 The cell 202 and the second cell 202 are installed across the second section, and are connected to each other in the first direction of the first section. The projection of the first section in the first direction and the projection of the second section in the first direction do not overlap. The second cell 202 and the third cell 203 are arranged in the first direction in the coil 200. 202 is installed across the first section and adjacent to the battery module 200. The second cell 202 and the third cell 203 are arranged in the first direction in the module 200. The pond 202 is installed across the second section, and the projection in the first direction of the first section and the projection in the first direction of the second section are It does not overlap with the projection in the direction.

[0120] In some embodiments, as shown in FIGS. 2, 18, and 19, the battery module 2 A plurality of cells 200 are installed, and two adjacent cells 20 The two second side surfaces 204 are bonded together, and the bonding position is referred to as the first position. , the second side surfaces 22 of two adjacent cells 202 in another adjacent battery module 200 04 are pasted together, and the pasted position is referred to as the second position, and the first position and the The two locations are spaced apart along the first direction. Due to the row arrangement, the positions of two adjacent battery modules 200 where the structural strength is relatively low are mutually The first position and the second position are displaced from each other, so that the battery pack 10 This helps to improve the overall strength of the battery module 200. The second side surfaces 204 of the adjacent cells 202 are attached to each other, so that the battery pack 10 This helps to reduce the space occupied by the battery pack 10 and improves the volume utilization rate of the battery pack 10.

[0121] For example, in one battery module 200, the first unit arranged along the first direction The second side 204 of the battery 202 and the second side 204 of the second cell 202 are attached to each other. The bonding position is referred to as the first position, and the battery module 200 is adjacent to the first position. In the other battery module 200, the first cell 202 arranged along the first direction The second side 204 and the second side 204 of the second cell 202 are attached to each other, The bonding position is referred to as the second position, and the first and second positions are spaced apart along the first direction. Alternatively, the cells are arranged in one battery module 200 along the first direction. The second side 204 of the second cell 202 and the second side 204 of the third cell 202 are are attached to each other, and the attached position is referred to as a first position. In another battery module 200 adjacent to the first battery module 200, a second battery module 200 arranged along the first direction The second side 204 of the first cell 202 and the second side 204 of the third cell 202 are attached to each other. The bonding position is referred to as the second position, and the first position and the second position are in the first direction. are installed at intervals along the direction.

[0122] Furthermore, the number of cells 202 in two adjacent battery modules 200 is different, One battery module 200 is referred to as the first battery module, and the other battery module 2 00 is represented as the second battery module, and the number of cells 202 in the first battery module is , the number of cells 202 in the second battery module is greater than the number of cells 202 in the second battery module. A reinforcement block 700 is provided which is connected to the cells 202 in the two-cell module. As can be seen, the cells 202 in two adjacent battery modules 200 are arranged as described above. After the batteries are arranged in a row, a space is formed at the position where the battery unit 201 of the second battery module is located. In this case, a reinforcing block 700 is installed in the vacant position, and the reinforcing block 700 are connected to the cells 202, thus further improving the strength of the battery module 200. This can increase the overall strength of the battery pack 10. For example, a space is formed at one end or both ends of the battery unit of the second battery module along the first direction. Alternatively, a space is formed in the middle of the battery units of the second battery module. In this case, a reinforcing block is installed in the vacant position. The reinforcing block is fixed to the second side surface of the cell. The reinforcing block may be fixedly attached to the reinforcing member, and the reinforcing member may be It is fixedly attached to the first side of the cell.

[0123] For example, the number of cells 202 in the first battery module is four, and the number of cells 202 in the second battery module is four. The number of cells 202 in the second battery module is three, and the number of cells 202 in the second battery module is three. A reinforcing block 700 is installed at one or both ends of the first direction of the 01. The number of cells 202 in the first battery module is three, and the number of cells 202 in the second battery module is four. The number of cells 202 in the second battery module is two, and the number of cells 202 in the first battery module is two. A reinforcing block 700 is installed at either one end or both ends along one direction.

[0124] Furthermore, the dimension of the first battery module along the first direction is The dimensions along the first and second battery modules are the same, and the first and second battery modules are The battery modules are arranged alternately in the X direction. This not only helps in arranging the battery 200 in the case 100 but also improves the space utilization rate of the battery pack 10. It can be improved.

[0125] In the above embodiment, the structure between the cells 202 and the case 100 The battery pack 10 is bonded using a construction adhesive to form the inside of the battery pack 10 firmly as a single unit. Preferably, the adhesive is injected to improve the overall strength of the battery pack. It helps to raise

[0126] In another aspect, the present application further provides an electric vehicle including the battery pack 10. The battery pack 10 has high structural strength, and the battery pack 10 having this structure can be mounted at the bottom of the automobile. This provides excellent support for the structural strength of the entire vehicle, making it easier to design the strength of the entire vehicle. This reduces the overall vehicle design cost and difficulty, and shortens the cycle. (Specific Examples 1 to 14)

[0127] Four rectangular parallelepiped cells 202 are arranged along the Y direction in the manner shown in FIG. The reinforcing members 300 are connected to two cells 202. The reinforcing member 300 is located on one side of the battery module 200 and has a shape as shown in FIG. The four cells 202 are flat, and are assembled into one battery module 200. Twelve such battery modules 200 are arranged in the X direction on a tray 10 as shown in FIG. The battery modules 200 are arranged and positioned in a matrix, with both ends of each battery module 200 being connected to the first frame 102 and the second frame 103. 103 and then sealed with a top cover to form a battery pack. The strength member 300 and the cell 202 meet Table 1 and GB / T 31467.3-2015 Lithium-ion Power Battery Packs and Systems for Electric Vehicles Part 3: Safety Requirements and The test results based on the "Test Method" are shown in Table 1.

[0128] Table 1: Test results of vibration resistance and pressure resistance of battery packs including battery modules of Examples 1 to 14 Strike results [Table 1] (Specific Examples 15 to 28)

[0129] Four rectangular parallelepiped cells 202 are arranged along the Y direction in the manner shown in FIG. The battery module 200 is connected by a reinforcing member 300. Two reinforcing members 300 are attached to one side of the battery module 200. On the other side of the battery module 200, one reinforcing member 300 is installed. 300 is connected to two single cells 202, and the shape of the reinforcing member 300 is as shown in FIG. The four flat cells 202 are assembled into one battery module 200. Twelve such battery modules 200 are arranged in the X direction on a tray 101 as shown in FIG. The battery modules 200 are arranged and disposed within the first frame 102 and the second frame 103, and both ends of each battery module 200 are connected to the first frame 102 and the second frame 103. 103 and then sealed with a top cover to form a battery pack. The strength member 300 and the cell 202 meet Table 2 and GB / T 31467.3-2015 Lithium-ion Power Battery Packs and Systems for Electric Vehicles Part 3: Safety Requirements and The test results based on the "Test Method" are shown in Table 2.

[0130] Table 2: Vibration resistance and pressure resistance of battery packs including battery modules of Examples 15 to 28 Test Results [Table 2]

[0131] In the description of this application, the terms "center," "vertical direction," "horizontal direction," "length," and "width" are used interchangeably. ", "Thickness", "Top", "Bottom", "Front", "Back", "Left", "Right", "Vertical", "Horizontal" "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", "Diameter The orientation or positional relationship indicated by "direction," "circumferential direction," etc. is based on the orientation or positional relationship shown in the drawings. The devices shown are merely for ease of explanation and brevity of the present application. or that the part must have a specific orientation and be configured and operated in a specific orientation. No limitation of the present application is implied or implied. .

[0132] Also, the terms "first" and "second" are merely descriptive of purpose and do not imply relative importance. or by implication the number of technical features shown. Therefore, the characteristics defined by "first" and "second" should not be understood as In the description of this application, the term "plurality" may be used to refer to any one of the features. Unless otherwise clearly and specifically limited, at least two, e.g., two, three, etc. means.

[0133] In this application, unless otherwise clearly specified or limited, the terms "attached," "connected," and "connected" are used interchangeably. "Continuation," "fixation," etc. should be understood in a broad sense, for example, unless otherwise clearly limited. As long as the connection is made in a fixed manner, it may be a detachable connection, or an integral connection. It may be a mechanical connection, an electrical connection, or a direct connection. It may be an indirect connection via an intermediate medium, or an internal communication or may be the interaction relationship between two components. Those skilled in the art can The specific meanings of the above terms in this application can be understood.

[0134] In this application, unless otherwise clearly specified or limited, the first feature may be "on" or "above" the second feature. "Under" may be a direct contact between the first feature and the second feature, The first feature and the second feature may be indirectly in contact with each other via an intermediate medium. The fact that one feature is "above," "above," or "on top" of a second feature means that the first feature is The first feature may be directly above or diagonally above, and the horizontal height of the first feature is higher than the second feature. It is also acceptable to indicate that the first feature is "below," "underneath," or "on the underside" of the second feature. The first feature may be located directly below or diagonally below the second feature, and the water level of the first feature may be It may also be indicated that the horizontal height is lower than the second feature.

[0135] In the description herein, the terms "in one embodiment," "some embodiments," "examples," and "specific examples" may be used interchangeably. A description that refers to "a typical example" or "some examples" or the like is intended to be a description in combination with the example or examples. The specific features, structures, materials, or characteristics disclosed are included in at least one embodiment or example of this application. In this specification, the exemplary explanations for the above terms are not necessarily The invention is not limited to the same embodiment or example, and the specific features, structures, etc. described are not intended to be limiting. , materials, or properties may be combined as appropriate in any one or more embodiments or examples. In addition, unless they contradict each other, a person skilled in the art can easily understand the different methods described in this specification. The embodiments or examples may be combined and features of different embodiments or examples may be combined and combined. do.

[0136] Although the present application has been shown and described above, it will be understood that the above embodiments are merely exemplary. and should not be understood as limiting the present application, and a person skilled in the art would understand the scope of the present application. Changes, modifications, substitutions and variations can be made to the above embodiments. [Explanation of symbols]

[0137] 10, battery pack; 100, case; 101, tray; 102, first frame; 103 , second frame; 104, third frame; 105, fourth frame; 200, battery module 201, battery unit; 202, single cell; 203, first side; 204, second side; 2 05, Top surface; 206, Bottom surface; 207, Electrode terminal; 300, Reinforcement member; 400, Extension part; 5 00, structural adhesive; 600, power connection member; 700, reinforcing block.

Claims

1. a case having a bottom surface and a top surface, and a battery module located within the case; the battery module includes a battery unit and a reinforcing member, the battery unit includes N cells, where N is an integer greater than 2, there are M reinforcing members, where M is an integer greater than 1, at least some of the cells in the battery unit are connected by M reinforcing members, an outer surface of each of the cells includes a bottom surface facing the bottom surface of the case, a top surface facing the top surface of the case, and side surfaces, the side surfaces include a first side surface and two second side surfaces located on opposite sides of each other, the area of ​​the first side surface is the largest among the side surfaces, the area of ​​the first side surface is larger than the area of ​​the bottom surface of each of the cells and is larger than the area of ​​the top surface of each of the cells, Q (Q is an integer, 2≦Q<N) cells are arranged in order in a first direction, the second side surfaces are perpendicular to the first direction, the second side surfaces of two adjacent cells are placed opposite each other and are attached to each other, and the adjacent first side surfaces of two adjacent cells are connected by the reinforcing member, a second direction being a direction perpendicular to the first direction and the first side surface, a dimension of the reinforcing member along the second direction is D0, a dimension of one of Q adjacent cells connected to the reinforcing member along the second direction is D1, D0 and D1 satisfy 0.006≦D0 / D1≦0.5, and D1 is 10 to 90 mm.

2. The weight of one of the cells fixed to the reinforcing member is G, and D0 and G are 0.15 mm kg －１ <D0 / G<7mm・kg －１ 2. The battery pack according to claim 1, wherein the above formula is satisfied and D0=0.5 to 5 mm.

3. 2. The battery pack according to claim 1, wherein 0.012≦D0 / D1≦0.

4.

4. 2. The battery pack according to claim 1, wherein the number of cells connected to the reinforcing member among the Q adjacent cells is equal to or greater than Q / 2.

5. 2. The battery pack according to claim 1, wherein the M reinforcing members connect N cells to form a battery unit, and one reinforcing member is fixedly attached to a first side surface of each of the Q adjacent cells.

6. 2. The battery pack according to claim 1, wherein the length of the battery module along the first direction is 400 to 2500 mm, and the battery module abuts against a bottom surface of the case and is supported by the bottom surface of the case.

7. 2. The battery pack according to claim 1, wherein a length of a projection of the reinforcing member attached to the first side surface of at least one battery cell onto the first side surface of the battery cell along the first direction is S, and a length of the battery cell along the first direction is P, where S and P satisfy S = 0.1P to 0.5P.

8. 2. The battery pack of claim 1, wherein the M reinforcing members are located on one side of the battery module and arranged in order along a predetermined direction, a first reinforcing member is fixedly attached to a first side surface of each of the first to Qth cells, a second reinforcing member is fixedly attached to a first side surface of each of the Qth to 2Q-1th cells, a third reinforcing member is fixedly attached to a first side surface of each of the 2Q-1th to 3Q-2th cells, and similarly, an Mth reinforcing member is fixedly attached to a first side surface of each of the M×Q-(M-1)-(Q-1)th to M×Q-(M-1)th cells.

9. 2. The battery pack according to claim 1, wherein one of the reinforcing members is fixedly attached to the first side surfaces of two adjacent cells.

10. 2. The battery pack of claim 1, wherein the side surfaces include first side surfaces located on two opposite sides, the M reinforcing members are distributed on both sides of the battery module, the reinforcing member located on one side of the battery module is fixedly attached to one first side surface of each of Q adjacent cells, and the reinforcing member located on the other side of the battery module is fixedly attached to the other first side surface of each of Q adjacent cells.

11. 11. The battery pack of claim 10, wherein the reinforcing member located on one side of the battery module is fixedly attached to a surface of at least a portion of one of the first side surfaces of each of the Q adjacent cells, and the reinforcing member located on the other side of the battery module is fixedly attached to a surface of at least a portion of the other of the first side surfaces of each of the Q adjacent cells.

12. the reinforcing members located on both sides of the battery module are sequentially arranged along a predetermined direction, a first reinforcing member located on one side of the battery module is fixedly attached to one first side surface of each of the first to Qth cells, a second reinforcing member is fixedly attached to one first side surface of each of the Qth to 2Q-1th cells, and similarly, an Mth reinforcing member is fixedly attached to one first side surface of each of the M×Q-(M-1)-(Q-1)th to M×Q-(M-1)th cells, 11. The battery pack of claim 10, wherein a first reinforcing member located on the other side of the battery module is fixedly attached to the other first side surface of each of the first to Qth cells, a second reinforcing member is fixedly attached to the other first side surface of each of the Qth to 2Q-1th cells, and by analogy, an Mth reinforcing member is fixedly attached to the other first side surface of each of the M×Q-(M-1)-(Q-1)th to M×Q-(M-1)th cells.

13. The reinforcing members located on both sides of the battery module are arranged in order along a predetermined direction, and a first reinforcing member located on one side of the battery module is fixedly attached to one first side surface of each of the 1st to Qth cells, and a first reinforcing member located on the other side of the battery module is fixedly attached to one first side surface of each of the Qth to 2Q-1th cells, and a second reinforcing member located on one side of the battery module is fixedly attached to one first side surface of each of the 2Q-1th to 3Q-2th cells, and a second reinforcing member located on the other side of the battery module is fixedly attached to one first side surface of each of the 3Q-2th cells.

11. The battery pack of claim 10, wherein the Mth reinforcing member located on one side of the battery module is fixedly attached to one first side surface of each of the 2×M×Q-(2M-1)-2(Q-1)th to 2×M×Q-(2M-1)-(Q-1)th cells, and by analogy, the Mth reinforcing member located on the other side of the battery module is fixedly attached to one first side surface of each of the 2×M×Q-(2M-1)-(Q-1)th to 2×M×Q-(2M-1)th cells.

14. the reinforcing members located on both sides of the battery module are sequentially arranged along a predetermined direction, a first reinforcing member located on one side of the battery module is fixedly attached to one first side surface of each of the first to Qth cells, a second reinforcing member is fixedly attached to one first side surface of each of the Q+1th to 2Qth cells, and similarly, an Mth reinforcing member is fixedly attached to one first side surface of each of the M×Q−(Q−1)th to M×Qth cells, 11. The battery pack according to claim 10, wherein a first reinforcing member located on the other side of the battery module is fixedly attached to the other first side surface of each of the second to Q+1th cells, a second reinforcing member is fixedly attached to the other first side surface of each of the Q+2th to 2Q+1th cells, and similarly, an Mth reinforcing member is fixedly attached to the other first side surface of each of the M×Q-(Q-1)+1th to M×Q+1th cells.

15. 2. The battery pack according to claim 1, wherein extension portions are provided on both ends opposite the reinforcing member, one of the extension portions being attached to the top surface of each battery cell, and the other of the extension portions being attached to the bottom surface of each battery cell.

16. 2. The battery pack of claim 1, wherein the case has an X-direction, a Y-direction, and a Z-direction that are perpendicular to each other, the battery modules are installed in plurality, the plurality of battery modules are arranged in the case along the X-direction, N unit cells are arranged in order along the Y-direction, a top surface and a bottom surface of the unit cells are installed on opposite sides along the Z-direction, and a first direction is parallel to the Y-direction.

17. 17. The battery pack according to claim 16, wherein the unit cells are substantially rectangular parallelepipeds and have a length L, a width H, and a thickness D, the length L of the unit cells being equal to or greater than the width H, the width H of the unit cells being greater than the thickness D, and wherein an X-direction is a thickness direction of the unit cells, a Y-direction is one of the length direction and the width direction of the unit cells, and a Z-direction is the other of the length direction and the width direction of the unit cells.

18. 17. The battery pack of claim 16, wherein each of the cells includes six surfaces: a bottom surface, a top surface, two first side surfaces, and two second side surfaces, the two first side surfaces being located on opposite sides along the thickness direction, the two second side surfaces being located on opposite sides along the length direction, and the bottom surface and the top surface being located on opposite sides along the width direction.

19. 17. The battery pack of claim 16, wherein the case includes a first frame and a second frame disposed opposite each other along a Y direction, the battery module is disposed between the first frame and the second frame, one end of the battery module is supported by the first frame, and the other end of the battery module is supported by the second frame.

20. 2. The battery pack of claim 1, wherein the reinforcing member is fixedly attached to the first side of each of the Q adjacent cells by a structural adhesive.

21. 21. The battery pack according to claim 20, wherein the structural adhesive is a thermally conductive structural adhesive.

22. The battery pack according to claim 1 , wherein the reinforcing member is a reinforcing plate.

23. 23. The battery pack according to claim 22, wherein the reinforcing plate is a steel plate, an aluminum plate, or a glass fiber plate.

24. The battery pack according to claim 1 , wherein a plurality of the battery modules are installed, and there is a gap between two adjacent battery modules.

25. 2. The battery pack according to claim 1, wherein the second side surfaces of two adjacent cells in the battery unit are pasted together.

26. The battery pack according to claim 1 , wherein a plurality of the battery modules are installed, and a reinforcing member is installed between at least two adjacent battery modules.

27. 27. The battery pack according to claim 26, wherein the reinforcing member is fixedly attached to battery modules located on both sides of the reinforcing member.

28. 28. The battery pack according to claim 27, wherein the reinforcing member is an aluminum plate or a steel plate.

29. 2. The battery pack according to claim 1, wherein the case includes a tray and an upper cover that together define an accommodating space, the battery module is positioned in the accommodating space, and each battery cell in the battery module has a top surface fixedly attached to an inner surface of the upper cover and a bottom surface fixedly attached to an inner surface of the tray.

30. 30. The battery pack of claim 29, wherein the tray and / or the top cover are of a multi-layer composite structure.

31. 31. The battery pack of claim 30, wherein the multi-layer composite structure includes two layers of aluminum plates and a steel plate or a foamed aluminum plate sandwiched between the two layers of aluminum plates.

32. 32. The battery pack of claim 31, wherein the multi-layer composite structure includes two fiber composite layers and a foam material layer sandwiched between the two fiber composite layers.

33. 33. The battery pack of claim 32, wherein the fiber composite layer includes a glass fiber layer and / or a carbon fiber layer.

34. The battery pack according to any one of claims 1 to 33, wherein a plurality of battery modules are installed, and the second side surfaces of two adjacent unit cells in one battery module are bonded to each other, with the bonded position being a first position, and the second side surfaces of two adjacent unit cells in another adjacent battery module are bonded to each other, with the bonded position being a second position, the first position and the second position are installed at an interval along the first direction.

35. The battery pack according to any one of claims 1 to 33, characterized in that a plurality of battery modules are installed, two adjacent cells in one battery module are installed separated by a first section, and two adjacent cells in another adjacent battery module are installed separated by a second section, and a projection of the first section in a first direction and a projection of the second section in the first direction do not overlap.

36. 36. The battery pack of claim 35, wherein the number of cells in two adjacent battery modules is different, one battery module is designated as a first battery module, and the other battery module is designated as a second battery module, the number of cells in the first battery module is greater than the number of cells in the second battery module, and the second battery module is provided with a reinforcing block connected to the cells in the second battery module.

37. An electric vehicle comprising the battery pack according to any one of claims 1 to 33.

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