Battery module and battery pack

Abstract

The utility model provides a battery module. The battery module comprises a plurality of battery cells arranged along a first direction, and an elastic assembly between every two adjacent battery cells, the elastic assembly comprises a packaging bag and an elastic layer arranged in the packaging bag; before the battery module is assembled, the elastic layer is sealed by the packaging bag, so that the packaging bag and the elastic layer are in a vacuum compression state; in the assembly process, the plurality of compressed elastic components and the plurality of battery cells are alternately stacked to form the battery module reaching the assembly length, and the battery cells and the elastic components do not need to be integrally compressed through a compression tool, so that the battery cells are prevented from being damaged by the pressurization force of the tool; after the battery module is assembled, the packaging bag is opened to enable the elastic layer to rebound, so that the elastic layer applies pre-tightening force to the battery cells on the two sides, and the stability and the structural strength of the battery module are reinforced. The embodiment of the utility model further provides a battery pack which comprises the battery module and has the beneficial effects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a battery module and a battery pack. BACKGROUND

[0002] In the related art, when assembling a battery module, foam is directly attached to the side of a battery cell, and multiple foams and multiple battery cells are alternately stacked to form a battery cell group, and then the battery cell group is compressed as a whole by a compression tool, so that the battery cell group is compressed to an assembly length, and then end plates are welded at both ends of the battery cell group, and / or a steel band is sleeved on the outside of the battery cell group to form a battery module, and finally the battery module is placed in the cavity of a battery box. Among them, the assembly length is less than the final target length of the battery cell group in the battery module, and after the battery cell group is sleeved with the steel band and / or placed in the battery box, the compression tool is loosened, and the foam in the battery cell group rebounds to make the battery cell group grow until it reaches the target length to form a battery pack.

[0003] In this assembly process, in order to enable the battery cell group to be sleeved in the steel band and the subsequent battery module to be placed in the battery box, the compression force on the battery cell group is increased, so that the battery cell group is compressed to an assembly length less than the target length, and then sleeved or installed. During this process of compressing the battery cell group as a whole by the compression tool, the battery cell may be damaged by the pressure of the tool, resulting in the battery cell being crushed. The steps of compressing and clamping the entire battery cell group are complex, and the compression tool is also structurally complex. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiments of the present application is to provide a battery module and a battery pack, which can omit the module assembly step of compressing the battery cell by the compression tool and perform the assembly and arrangement of the battery module, thereby avoiding the possibility of the battery cell being damaged by the compression force of the compression tool.

[0005] In a first aspect, the embodiments of the present application provide a battery module, comprising a plurality of battery cells arranged in a first direction, and an elastic assembly arranged between every two adjacent battery cells, wherein the elastic assembly comprises an encapsulation bag and an elastic layer arranged in the encapsulation bag, and the encapsulation bag is capable of being vacuumized or opened to enable the elastic layer to be compressed or rebounded.

[0006] In an embodiment, along the first direction, the thickness of the elastic layer after compression is d1, and the thickness of the elastic layer after rebounding is d2, wherein (d1 / d2) x 100% = 10% to 70%.

[0007] In an embodiment, along the first direction, the thickness d2 of the elastic layer after rebounding is 0.5mm to 5mm, and the thickness of the side wall of the encapsulation bag is 10um to 100um.

[0008] In an embodiment, the packaging bag comprises a main body part and a tear-off part, the tear-off part is connected to an end of the main body part close to the top of the battery cell, the main body part and the tear-off part enclose a receiving cavity, and the elastic layer is arranged in the receiving cavity, wherein the tear-off part is used for tearing to form an opening of the main body part and make the receiving cavity communicate with the outside.

[0009] In an embodiment, the tear-off part protrudes from the top surface of the battery cell along the height direction of the battery cell.

[0010] In an embodiment, a tear opening is arranged at the connection between the tear-off part and the main body part.

[0011] In an embodiment, the length of the elastic layer along a second direction is L1, the length of the battery cell along the second direction is L2, the ratio of L1 to L2 is 0.8-0.95, and the second direction intersects the first direction.

[0012] In an embodiment, the height of the elastic layer along a third direction is H1, the height of the battery cell along the third direction is H2, the ratio of H1 to H2 is 0.8-0.9, and the third direction intersects the first direction.

[0013] In an embodiment, the elastic layer is a foam layer or a silica gel layer.

[0014] In an embodiment, the battery module further comprises an adhesive layer arranged between adjacent packaging bags and battery cells and connecting the side surface of the packaging bag and the side surface of the battery cell.

[0015] In a second aspect, the embodiments of the present application further provide a battery pack comprising a battery box and the battery module of any one of the above, wherein the battery box has a mounting cavity, and the battery module is mounted in the mounting cavity.

[0016] In an embodiment, the elastic layer rebounds to exert a pre-tightening force on the battery cells on both sides, and the pre-tightening force exerted by the elastic layer on the battery cells on both sides is 100 N-3000 N.

[0017] In an embodiment, the battery box comprises a box body having an opening, a partition plate arranged in the box body, a first baffle and a second baffle;

[0018] The partition plate is arranged in the box body along a second direction, and the partition plate and the box body enclose an electrical cabin and the mounting cavity;

[0019] The first baffle is arranged in the mounting cavity along a first direction, the second baffle is arranged in the mounting cavity along the second direction, the first direction intersects the second direction, and the first baffle intersects the second baffle.

[0020] The battery module provided by the embodiment of the present application has the beneficial effects that the battery module comprises a plurality of battery cells arranged along a first direction, and an elastic assembly arranged between two adjacent battery cells; compared with the related art, the present application is provided with an elastic assembly between every two battery cells, the elastic assembly comprises an encapsulation bag and an elastic layer arranged in the encapsulation bag; before the assembly of the battery module, the elastic layer is arranged in the encapsulation bag, the encapsulation bag seals the elastic layer and performs vacuumization, so that the elastic layer is compressed to a certain length, and then the elastic assembly is arranged between the two battery cells through the encapsulation bag; during the assembly process, the plurality of compressed elastic assemblies and the plurality of battery cells are alternately stacked to form the battery module with the assembly length, without the overall compression of the battery cells and the elastic assembly by the compression tool, so that the damage of the battery cells caused by the compression of the tool is avoided, and the use of the complex compression tool is saved, and the assembly tool structure can be simplified; when the battery module is installed into the battery box, the battery module with the assembly length in the compressed state is more convenient to install into the box, and after the assembly and installation of the battery module are completed, the elastic layer can be rebounded by opening the encapsulation bag, so that the elastic layer applies a pre-tightening force to the battery cells on both sides, and the structural stability and the structural strength of the battery module and the battery pack are reinforced. The embodiment of the present application also provides a battery pack comprising the battery module of the present application, which has the beneficial effects described above. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 The three-dimensional structure schematic diagram of the battery module provided by an embodiment of the present application is shown in the figure.

[0023] Figure 2 The three-dimensional structure schematic diagram of the elastic assembly in the battery module provided by an embodiment of the present application is shown in the figure.

[0024] Figure 3 The exploded structure schematic diagram of the elastic assembly in the battery module provided by an embodiment of the present application is shown in the figure.

[0025] Figure 4 The thickness schematic diagram of the elastic layer in the battery module provided by an embodiment of the present application before and after compression and rebound is shown in the figure.

[0026] Figure 5 The size structure schematic diagram of the elastic layer in the battery module provided by an embodiment of the present application is shown in the figure.

[0027] Figure 6 A perspective structural schematic diagram of a battery pack provided for another embodiment of the present application is shown in FIG. 3.

[0028] In the drawings, reference numerals:

[0029] Battery pack 1000; battery module 100; battery box 200; mounting cavity U;

[0030] Battery cell 110; elastic assembly 120; packaging bag 121; elastic layer 122; main body part 121A; tear-off part 121B; tear opening K;

[0031] First direction X; second direction Y; third direction Z. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0036] Please refer to Figures 1 to 5The battery module 100 provided by an embodiment of the present application will be described. The battery module 100 of the present application includes a plurality of battery cells 110 and a plurality of elastic assemblies 120. The plurality of battery cells 110 are arranged along a first direction X, and an elastic assembly 120 is arranged between every two adjacent battery cells 110, as shown in Figure 1 The first direction X is the thickness direction of the battery cell 110. The elastic assembly 120 includes a packaging bag 121 and an elastic layer 122 arranged in the packaging bag 121, as shown in Figure 2 and Figure 3 The packaging bag 121 encapsulates the elastic layer 122 and is vacuumized or opened to compress or rebound the elastic layer 122.

[0037] When the battery module 100 is assembled, the packaging bag 121 encapsulates and vacuumizes the elastic layer 122 in the packaging bag 121, so that the elastic layer 122 is compressed and then adheres to the side of the battery cell 110 through the packaging bag 121, thereby the step of compressing the battery cell 110 and the elastic layer 122 together by a compression tool can be omitted. When the packaging bag 121 is opened, the elastic layer 122 contacts with the outside air and absorbs expansion to rebound, so that the thickness of the elastic layer 122 increases, and a certain initial pre-tightening force is applied to the battery cells 110 on both sides, and then the overall length of the battery module 100 along the first direction X is lengthened. Optionally, in the present application, the battery module 100 omits the arrangement of the steel belt, thereby avoiding the damage caused by the extrusion of the steel belt to the elastic layer 122 or the battery cell 110 due to the rebound of the elastic layer 122 and the lengthening of the overall length of the battery cell 110 and the elastic layer 122.

[0038] The battery module 100 provided by the embodiment of the present application is provided with an elastic assembly 120 between every two battery cells 110, the elastic assembly 120 comprises an encapsulation bag 121 and an elastic layer 122 arranged in the encapsulation bag 121; before the assembly of the battery module 100, the elastic layer 122 is arranged in the encapsulation bag 121, the encapsulation bag 121 seals and evacuates the elastic layer 122, so that the elastic layer 122 is compressed to a certain length, and then the elastic assembly 120 is arranged between the two battery cells 110 through the encapsulation bag 121; during the assembly process, the plurality of compressed elastic assemblies 120 and the plurality of battery cells 110 are alternately stacked to form the battery module 100 reaching the assembly length, without the need of the overall compression of the battery cells 110 and the elastic assembly 120 by the compression tool, so that the damage of the battery cells 110 caused by the compression of the tool is avoided, and the use of the complex compression tool is saved, and the assembly tool structure can be simplified; when the battery module 100 is installed into the battery box 200, the battery module 100 in the compressed state and reaching the assembly length is more convenient to install into the box, and after the assembly and installation of the battery module 100 are completed, the elastic layer 122 can be rebounded by opening the encapsulation bag 121, so that the elastic layer 122 exerts the pre-tightening force on the battery cells 110 on both sides, and the structural stability and the structural strength of the battery module 100 and the battery pack 1000 are reinforced.

[0039] It can be understood that the length of the battery module 100 installed in the battery box 200 is set as the target length, the assembly length of the battery module 100 during the assembly is smaller than the target length, so that the battery module 100 is conveniently installed into the box. Optionally, the target length is determined according to the length of the installation cavity U in the battery box 200, the material of the elastic layer 122 is determined according to the thickness of the battery cell 110 and the target length, and the assembly length is determined according to the thickness of the battery cell 110 and the thickness, the elastic modulus of the elastic layer 122. As long as the assembly length is smaller than the target length, the present application is not limited.

[0040] In the embodiment, the encapsulation bag 121 comprises a main body part 121A and a tearing part 121B, as shown in Figure 2 The tearing part 121B is connected to one end of the main body part 121A close to the top of the battery cell 110, as shown in Figure 1 The main body part 121A and the tearing part 121B surround a containing cavity, and the elastic layer 122 is arranged in the containing cavity. The tearing part 121B is used to tear to form an opening of the main body part 121A and to make the containing cavity communicate with the outside.

[0041] It can be understood that the packaging bag 121 includes a main body part 121A and a tear-off part 121B, the main body part 121A and the tear-off part 121B are arranged to form a containing cavity, and the elastic layer 122 is arranged in the containing cavity, so that the packaging bag 121 can package the elastic layer 122 and be vacuumized. When the battery module 100 is arranged in the battery box 200, the tear-off part 121B is torn off, so that the main body part 121A forms an opening, air enters the containing cavity from the opening, that is, the containing cavity is in communication with the outside world; so that the air contacts the elastic layer 122 and makes the elastic layer 122 swell and rebound, and then the thickness of the elastic layer 122 increases, a certain initial pre-tightening force is applied to the two sides of the battery cell 110, and the overall length of the battery module 100 in the first direction X is lengthened, and the battery module 100 is stably installed in the battery box 200.

[0042] Further, since the installation cavity U in the battery box 200 is open upward, when the battery module 100 is installed in the battery box 200, the four sides are close to or abut against the battery box 200, in the embodiment, the tear-off part 121B is connected to one end of the main body part 121A along the third direction Z, that is, one end of the main body part 121A close to the top of the battery cell 110, so that the tear-off part 121B of the packaging bag 121 is torn off from the opening of the installation cavity U, so that the packaging bag 121 is opened and the outside air enters the packaging bag 121. Wherein, the third direction Z is the height direction of the battery cell 110.

[0043] Further, the tear-off part 121B protrudes from the top surface of the battery cell 110 along the third direction Z, that is, the tear-off part 121B is arranged to protrude from the top surface of the battery cell 110 along the height direction of the battery cell 110, so that the assembly personnel can easily grasp the tear-off part 121B to separate the tear-off part 121B from the main body part 121A.

[0044] In the embodiment, the first direction X is the arrangement direction of the battery cell 110, the second direction Y is the length direction of the battery cell 110, and the third direction Z is the height direction of the battery cell 110. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0045] As Figure 2As shown, a tearing hole K is provided at the connection between the tearing portion 121B and the main body portion 121A. The packaging bag 121 has a central axis C in the length direction along the second direction Y, that is, the central axis C extends along the third direction Z. The tearing portion 121B and the main body portion 121A are both recessed toward the central axis C on both sides along the third direction Z, forming two tearing holes K respectively. Due to the provision of the tearing hole K, when the assembler grabs the tearing portion 121B and tears the packaging bag 121, the tearing portion 121B is easily torn from the tearing hole K to form an opening. Optionally, the tearing hole K may be "U"-shaped, square or triangular. In the present embodiment, the tearing hole K is triangular, so that the tearing portion 121B is easier to tear from the sharp corner of the triangle to form an opening. Optionally, the tearing hole K may also be other shapes, as long as it is convenient for the tearing portion 121B to be torn from the tearing hole K. As shown Figure 2 As shown, the tear-off portion 121B is easily torn along the dotted line to form an opening. Furthermore, the thickness of the packaging bag 121 at the dotted line is less than the total thickness of the main body 121A or the thickness of the tear-off portion 121B. This makes it easier for the tear-off portion 121B to be torn along the dotted line and separated from the main body 121A. Furthermore, the edge formed by tearing the tear-off portion 121B along the dotted line is more neat and aesthetically pleasing. Alternatively, the tear-off portion 121B may be partially separated from the main body 121A, as long as air can enter the accommodating cavity of the packaging bag 121.

[0046] like Figure 4 As shown, along the first direction X, the thickness of the elastic layer 122 after compression is d1, and the thickness of the elastic layer 122 after rebound is d2, where (d1 / d2) × 100% = 10% to 70%. Specifically, (d1 / d2) × 100% = 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70%, etc. It can be understood that when the elastic layer 122 rebounds, it applies a preload force to the battery cell 110, providing a cushioning effect when the battery module 100 is squeezed or impacted. A compression ratio of the elastic layer 122 between 10% and 70% allows for greater rebound space after installation of the battery module 100, and ensures that the elastic layer 122 still provides sufficient preload force to secure the battery cell 110 after rebound.

[0047] Specifically, along the first direction X, the thickness d2 of the elastic layer 122 after rebounding is 0.5mm-5mm, for example, d2=0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm or 5.0mm, etc. It can be understood that the greater the rebounding thickness d2 of the elastic layer 122, the greater the length that the battery module 100 can eventually reach, and the installation cavity U of the battery box 200 of various sizes can be adapted. Along the first direction X, the thickness of the side wall of the packaging bag 121 is 10μm-100μm. For example, the thickness of the side wall of the packaging bag 121 is 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 100μm, etc. It can be understood that the smaller the thickness of the side wall of the packaging bag 121, the less space the packaging bag 121 occupies; the greater the thickness of the side wall of the packaging bag 121, the more stable the packaging bag 121 is fitted with the side surface of the battery cell 110, and the stronger the packaging performance of the packaging bag 121 on the elastic layer 122. The total thickness of the packaging bag 121 is greater than or equal to 5.5mm, and when the packaging bag 121 is vacuum packaged on the elastic layer 122, the packaging bag 121 shrinks along with the shape of the elastic layer 122, occupying less space, and when the elastic layer 122 rebounds, the packaging bag 121 with a total thickness greater than or equal to 5.5mm can expand along with the rebounding of the elastic layer 122.

[0048] See also Figure 1 and Figure 5In the embodiment, the length of the elastic layer along the second direction Y is L1, the length of the battery cell 110 along the second direction Y is L2, and the ratio of L1 to L2 is 0.8-0.95. Specifically, L1 / L2=0.8, L1 / L2=0.82, L1 / L2=0.85, L1 / L2=0.88, L1 / L2=0.9, or L1 / L2=0.95, etc. The height of the elastic layer along the third direction Z is H1, the height of the battery cell 110 along the third direction Z is H2, and the ratio of H1 to H2 is 0.8-0.9. Specifically, H1 / H2=0.8, H1 / H2=0.82, H1 / H2=0.85, H1 / H2=0.86, H1 / H2=0.88, or H1 / H2=0.9, etc. It can be understood that the long side and the short side of the battery cell 110 are usually made into a round corner transition, so that the structure of the battery cell 110 is more stable and is not easy to be damaged by impact. Therefore, the length of the elastic layer 122 arranged between the long sides of the two battery cells 110 is slightly smaller than the length of the battery cell 110, so that the shape of the elastic layer 122 and the long side of the battery cell 110 is more fitted, so as to uniformly apply the pre-tightening force to the side of the battery cell 110. Moreover, the elastic layer 122 is covered in the packaging bag 121, and the length of the elastic layer 122 is set to be smaller than the length of the battery cell 110, which also provides space for the packaging edge of the packaging bag 121. That is, along the second direction Y, the ratio of L1 to L2 is 0.8-0.95, so that the elastic layer can be as large as possible to be fitted with the side of the battery cell 110, thereby uniformly applying the pre-tightening force to the side of the battery cell 110, and the length of the elastic layer does not exceed the side of the battery cell 110, thereby avoiding the elastic layer occupying excessive space. Similarly, along the third direction Z, the ratio of H1 to H2 is 0.8-0.9, so that the elastic layer can be as large as possible to be fitted with the side of the battery cell 110, and space is reserved for the packaging of the elastic layer 122 in the packaging bag 121.

[0049] Optionally, the elastic layer 122 is a foam layer or a silica gel layer, etc. Optionally, in other embodiments, the elastic layer 122 can also be a layer of other materials with compression elasticity. Specifically, the foam layer can be a polyurethane (PU) layer or an ethylene vinyl acetate copolymer (EVA) layer.

[0050] The battery module 100 also includes an adhesive layer (not shown). The packaging bag 121 is attached to the sides of the battery cell 110 via the adhesive layer. Specifically, the adhesive layer is disposed between adjacent packaging bags 121 and battery cells 110, connecting the sides of the packaging bag 121 to the sides of the battery cell 110. By applying adhesive to the sides of the packaging bag 121 and attaching the packaging bag 121 to the sides of the battery cell 110, the elastic layer 122 and the packaging bag 121 are secured to the sides of the battery cell 110. After the adhesive cures, the adhesive layer is formed. Optionally, the thickness of the adhesive layer is 10 μm to 1000 μm. For example, the thickness of the adhesive layer is 10 μm, 30 μm, 50 μm, 80 μm, 90 μm, 100 μm, 200 μm, 300 μm, 500 μm, 600 μm, 800 μm, 900 μm, or 1000 μm. It can be understood that the greater the thickness of the adhesive layer, the stronger the connection strength between the adhesive layer and the packaging bag 121 and the battery cell 110 , and the smaller the thickness of the adhesive layer, the less space the adhesive layer occupies.

[0051] Optionally, the battery module 100 further includes a protective side plate. A battery module 100 includes two protective side plates. The two protective side plates are respectively arranged at both ends of a plurality of arranged battery cells 110 along the first direction X. Optionally, the protective side plates are connected to the battery cells 110 at the head end or the tail end, or the protective side plates are connected to the packaging bag 121 at the head end or the tail end. It is understandable that the two protective side plates are arranged at both ends of the plurality of battery cells 110 to protect the battery cells 110 and reduce the possibility of the battery cells 110 being damaged by collision with the battery box 200 or other tooling. In addition, the connection between the protective side plates and the battery cells 110 or the packaging bag 121 can strengthen the overall structural strength of the battery module 100. Optionally, the thickness of the protective side plates is 3 mm to 12 mm. For example, the thickness of the protected side plates is 3 mm, 5 mm, 6 mm, 8 mm, 10 mm or 12 mm, etc.

[0052] See also Figure 6 Another embodiment of the present application provides a battery pack 1000, comprising a battery box 200 and a battery module 100 according to an embodiment of the present application. The battery box 200 has an electrical compartment and a mounting cavity U. The electrical compartment is used to install control components such as a battery management system, and the mounting cavity U is used to install the battery module 100. That is, the battery module 100 is installed in the mounting cavity U.

[0053] In the embodiment, the battery box 200 includes a box body with an opening and a partition plate and a baffle arranged in the box body. The baffle further includes a first baffle and a second baffle. Optionally, the partition plate is arranged in the box body along the second direction Y, so that the box body is divided into an electrical cabin and a mounting cavity U. The first baffle and the second baffle are arranged in the mounting cavity U. Specifically, the first baffle extends along the first direction X, the second baffle extends along the second direction Y, and the first baffle and the second baffle intersect, so that the mounting cavity U is divided into a plurality of sub-cavities. One sub-cavity can install one battery module 100.

[0054] Optionally, in other embodiments, the battery box 200 includes a box body with an opening and a partition plate. The mounting cavity U is not provided with a baffle, and one battery module 100 is installed in one mounting cavity U. Optionally, the mounting cavity U can also be divided into six or eight sub-cavities, so as to install six or eight battery modules 100, which is not limited in the application.

[0055] Optionally, the elastic layer 122 rebounds to exert a pre-tightening force on the two sides of the battery cell 110, and the pre-tightening force is 100N-3000N. Optionally, the pre-tightening force is 100N, 200N, 500N, 600N, 700N, 800N, 900N, 1000N, 1200N, 1300N, 1500N, 1800N, 2000N, 2100N, 2200N, 2500N, 2800N or 3000N, etc. It can be understood that the greater the pre-tightening force of the elastic layer 122 after rebound, the greater the fastening force of the elastic layer 122 on the battery cell 110 and the battery box 200. The pre-tightening force of the elastic layer 122 on the battery cell 110 after rebound is between 100N and 3000N, so that the elastic layer 122 can fasten the battery cell 110 while reducing the damage of the elastic layer 122 to the battery cell 110.

[0056] The above is the description of the battery module 100 and the battery pack 1000 provided in the embodiments of the application.

[0057] The battery module provided by the embodiment of the present application comprises a plurality of battery cells arranged along a first direction, and an elastic assembly arranged between every two battery cells, wherein the elastic assembly comprises a packaging bag and an elastic layer arranged in the packaging bag; before the battery module is assembled, the elastic layer is arranged in the packaging bag, the packaging bag seals the elastic layer and is vacuumized, so that the elastic layer is compressed to a certain length, and then the elastic assembly is arranged between the two battery cells through the packaging bag; during the assembly process, the plurality of compressed elastic assemblies and the plurality of battery cells are alternately stacked to form the battery module with an assembly length, and the battery cells and the elastic assembly do not need to be compressed as a whole through a compression tool, so that the damage of the battery cells caused by the compression of the tool is avoided, and the use of the complex compression tool is saved, and the assembly tool structure can be simplified; when the battery module is installed into a battery box, the battery module with the assembly length in the compressed state is more convenient to install into the box, and after the assembly and installation of the battery module are completed, the elastic layer can be rebounded by opening the packaging bag, so that the elastic layer applies a pre-tightening force to the battery cells on both sides, and the structural stability and the structural strength of the battery module and the battery pack are reinforced. The embodiment of the present application further provides a battery pack comprising the battery module of the present application, and has the beneficial effects described above.

[0058] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module, characterized in that: It comprises a plurality of battery cells arranged along a first direction, an elastic component is arranged between every two adjacent battery cells, the elastic component comprises a packaging bag and an elastic layer arranged in the packaging bag, and the packaging bag is vacuumed or opened to allow the elastic layer to compress or rebound.

2. The battery module according to claim 1, wherein: Along the first direction, the thickness of the elastic layer after compression is d1, and the thickness of the elastic layer after rebound is d2, wherein (d1 / d2)×100%=10%~70%.

3. The battery module according to claim 1, wherein: Along the first direction, the thickness d2 of the elastic layer after rebound is 0.5 mm to 5 mm, and the thickness of the side wall of the packaging bag is 10 μm to 100 μm.

4. The battery module according to any one of claims 1 to 3, wherein: The packaging bag includes a main body and a tearing portion, wherein the tearing portion is connected to one end of the main body near the top of the battery cell, the main body and the tearing portion are arranged to form a accommodating cavity, and the elastic layer is arranged in the accommodating cavity, wherein the tearing portion is used to tear off to form an opening in the main body and to connect the accommodating cavity with the outside world.

5. The battery module according to claim 4, wherein: The tear-off portion is arranged to protrude from the top surface of the battery core along a height direction of the battery core.

6. The battery module according to claim 5, wherein: A tearing opening is provided at the connection between the tearing portion and the main body portion.

7. The battery module according to any one of claims 1 to 3, wherein: The length of the elastic layer along the second direction is L1, the length of the battery core along the second direction is L2, the ratio of L1 to L2 is 0.8-0.95, and the second direction intersects the first direction.

8. The battery module according to any one of claims 1 to 3, wherein: A height of the elastic layer along the third direction is H1, a height of the battery cell along the third direction is H2, a ratio of H1 to H2 is 0.8-0.9, and the third direction intersects with the first direction.

9. The battery module according to any one of claims 1 to 3, wherein: The elastic layer is a foam layer or a silicone layer.

10. The battery module according to any one of claims 1 to 3, wherein: The battery module further includes an adhesive layer, which is disposed between adjacent packaging bags and battery cells and connects a side surface of the packaging bag and a side surface of the battery cell.

11. A battery pack, characterized in that: It comprises a battery box and a battery module as claimed in any one of claims 1 to 10, wherein the battery box has an installation cavity, and the battery module is installed in the installation cavity.

12. The battery pack according to claim 11, wherein: The elastic layer rebounds to apply a pre-tightening force to the battery cells on both sides, and the pre-tightening force applied by the elastic layer to the battery cells on both sides is 100N~3000N.

13. The battery pack according to claim 11, wherein: The battery box includes a box body with an opening, a partition plate arranged in the box body, a first baffle and a second baffle; The partition plate is arranged in the box body along the second direction, and the partition plate and the box body enclose an electrical compartment and the installation cavity; The first baffle is extended in the installation cavity along a first direction, and the second baffle is extended in the installation cavity along the second direction. The first direction intersects with the second direction, and the first baffle intersects with the second baffle.

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