Battery pack

Abstract

The utility model belongs to the field of secondary batteries, and particularly relates to a battery pack. In order to improve the overall structural strength of the battery pack, the utility model provides the battery pack, the battery pack comprises at least two battery modules, a module reinforcing plate is arranged between every two adjacent battery modules, and the two sides, directly facing the battery modules, of each module reinforcing plate are respectively bonded and fixed with the corresponding battery modules through structural adhesive. By arranging the module reinforcing plate and reducing the thickness of each structural adhesive, the connection strength of the adjacent battery modules can be improved, and the overall structural strength of the battery pack is improved. In actual use, the module reinforcing plate is arranged between the two battery modules, so that two sides of the module reinforcing plate are subjected to opposite acting forces when the battery core of each battery module is subjected to thermal expansion deformation, and the module reinforcing plate can be effectively prevented from deforming and the structural adhesive can be effectively prevented from falling off.

Description

Technical Field

[0001] This utility model belongs to the field of secondary batteries, and in particular relates to a battery pack. Background Technology

[0002] like Figure 1 As shown, in the prior art, a battery pack includes a battery housing and battery modules 3 installed inside the battery housing. The battery housing is divided into an upper housing 1, a lower housing 4, and a sealing gasket 2 located between the upper housing 1 and the lower housing 4. The number of battery modules 3 can be one, two, or more. Specifically, in Figure 1 In the middle, there are three battery modules 3 arranged at intervals along the y direction, and each battery module 3 contains 14 cells arranged along the x direction, two end plates located at both ends of each battery module, and strapping straps for binding and fixing all the cells and end plates.

[0003] In the existing technology, there is no fixed connection between two adjacent battery modules 3. When the battery pack vibrates, the vibration of the two adjacent battery modules 3 is relatively independent, resulting in a low overall structural strength of the battery pack. At the same time, in order to avoid collision between two adjacent battery modules 3 when the battery pack vibrates, a fitting gap (usually 10 mm, but can be adjusted according to actual needs) is reserved between the two adjacent battery modules 3. This results in a large y-axis dimension of the battery pack and a low volumetric energy density of the battery pack.

[0004] To address the aforementioned issues, Chinese utility model patent CN215342785U, with an authorization announcement date of December 28, 2021, discloses a battery pack comprising multiple battery modules. Adjacent battery modules are directly bonded together using an adhesive with good curing properties (equivalent to structural adhesive). In actual manufacturing, liquid structural adhesive is applied between two adjacent battery modules. The liquid structural adhesive exposed to air can quickly solidify in a short time, thereby bonding the two adjacent battery modules together.

[0005] In the aforementioned battery pack, when the cells in the battery modules undergo thermal expansion and deformation, the structural adhesive between adjacent battery modules is compressed and deformed, thus providing space for the thermal expansion and deformation of the cells and meeting the requirements of cell thermal expansion and deformation. To meet the requirements of thermal expansion and deformation of cells in adjacent battery modules, the structural adhesive between adjacent battery modules is relatively thick. If the thickness of the structural adhesive required to meet the thermal expansion and deformation of a single cell is defined as T, then the thickness of the structural adhesive between adjacent battery modules is at least 2T. Since the adhesive itself has limited strength after solidification, a thicker structural adhesive between adjacent battery modules results in poorer connection strength between the adjacent battery modules, leading to lower overall structural strength of the battery pack. Utility Model Content

[0006] The purpose of this utility model is to provide a battery pack to solve the technical problem in the prior art where the overall structural strength of the battery pack is low due to poor connection strength between adjacent battery modules.

[0007] To achieve the above objectives, the technical solution for the battery pack provided by this utility model is as follows:

[0008] A battery pack includes at least two battery modules. A module reinforcing plate is provided between adjacent battery modules. The two sides of the module reinforcing plate facing the battery modules are respectively bonded and fixed to the corresponding battery modules by structural adhesive. Each module reinforcing plate has an adhesive-containing space on its two sides facing the adjacent battery modules. One side of each adhesive-containing space is open, and the opening of each adhesive-containing space is directly opposite the adjacent battery module. The module reinforcing plate is bonded to the corresponding battery module by structural adhesive filled in the adhesive-containing space. Each structural adhesive has a set thickness in the battery module arrangement direction to meet the needs of thermal expansion and deformation of the battery cells.

[0009] Furthermore, the module reinforcing plate includes a plate body, and the adhesive-containing space is surrounded by adhesive-blocking strips disposed on the surface of the plate body.

[0010] Furthermore, the cross-sectional shape of the adhesive space is rectangular, and the adhesive-blocking strip is divided into two sets of adhesive-blocking strips that form the length and width of the rectangle, respectively. At least one set of adhesive-blocking strips is separately set from the board body to form a split adhesive-blocking strip. The board body also has a positioning structure for positioning the split adhesive-blocking strip. The positioning structure has a guide surface for guiding the split adhesive-blocking strip to move away from the structural adhesive. The guide surface is a guide slope or guide curved surface that contacts the split adhesive-blocking strip. The thickness of the positioning structure is less than the thickness of the split adhesive-blocking strip.

[0011] Furthermore, the positioning structure is a curved ridge, and at least a portion of the surface of the ridge near the corresponding split adhesive strip constitutes the guide surface.

[0012] Furthermore, the module reinforcement plate includes a plate body, and the adhesive space is formed by a groove disposed on the surface of the plate body.

[0013] Furthermore, the module reinforcement plate is also provided with an overflow space, which is arranged next to the adhesive containment space to contain structural adhesive that overflows from the adhesive containment space.

[0014] Furthermore, the two ends of each module reinforcing plate are respectively limited to the two end plates of one side of the battery module by guide limiting members. The module reinforcing plate and the guide limiting members can move and cooperate along the arrangement direction of the battery module. When the module reinforcing plate and structural adhesive are squeezed by adjacent battery modules, the module reinforcing plate can move under the guidance of the guide limiting members.

[0015] Furthermore, the module reinforcement plate is positioned between two straps arranged above and below the battery module. A plug is provided at the upper end of the upper strap. In the arrangement direction of the battery module, the two ends of the plug are coated with adhesive and bonded to the two adjacent battery modules for fixation.

[0016] Furthermore, the plug includes an insertion portion and an overlapping portion. The insertion portion is inserted between adjacent battery modules and bonded to the adjacent battery modules. The overlapping portion overlaps on the upper end surface of at least one of the two battery modules bonded to the insertion portion.

[0017] The beneficial effects of this utility model's battery pack are as follows: This utility model is an improved invention. If the thickness of the structural adhesive required to meet the thermal expansion deformation of a single battery cell is defined as T, and a module reinforcing plate is set between two battery modules, the thickness of the structural adhesive between the module reinforcing plate and the battery module only needs to be greater than T. By setting the module reinforcing plate and reducing the thickness of each structural adhesive, the connection strength between adjacent battery modules can be improved, thus enhancing the overall structural strength of the battery pack. In actual use, because the module reinforcing plate is set between two battery modules, when the battery cells of each battery module undergo thermal expansion deformation, the two sides of the module reinforcing plate are subjected to opposite forces, thereby effectively preventing deformation of the module reinforcing plate and detachment of the structural adhesive. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a battery pack in the prior art;

[0019] Figure 2 This is a schematic diagram of the structure of a single module reinforcing plate and two adjacent battery modules in the battery pack of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a single module reinforcing plate and a single battery module in the battery pack of this utility model;

[0021] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;

[0022] Figure 5 for Figure 3 A partial structural diagram of the middle module reinforcement plate;

[0023] Figure 6 This is a front view of a single module reinforcing plate, plug, and a single battery module in the battery pack of this utility model;

[0024] Figure 7 This is a side view of a single module reinforcing plate, plug, and two adjacent battery modules in the battery pack of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] Figure 1Middle: 1. Upper casing; 2. Sealing gasket; 3. Battery module; 4. Lower casing;

[0027] Figure 2-7 In the middle: 1. Battery module; 11. Bundling strap; 12. End plate; 2. Module reinforcing plate; 211. Integrated adhesive strip; 212. Separate adhesive strip; 22. Adhesive space; 23. Positioning structure; 24. Adhesive overflow space; 3. Pull rivet; 4. Plug; 5. Bottom structural adhesive. Detailed Implementation

[0028] To address the problems in the background technology, the core inventive concept of this utility model is as follows: If the thickness of the structural adhesive required to meet the thermal expansion deformation of a single battery cell is defined as T, in the battery module arrangement direction, by setting a module reinforcing plate between two battery modules, under the premise of meeting the thermal expansion deformation requirements of the battery cell, the thickness of the structural adhesive between the module reinforcing plate and the battery module only needs to be greater than T. By setting the module reinforcing plate and reducing the thickness of each structural adhesive, the connection strength of adjacent battery modules can be improved, and the overall structural strength of the battery pack can be improved.

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] Specific embodiments of the battery pack provided by this utility model:

[0031] Reference Figure 2-7 As shown, the battery pack includes a battery housing and at least two battery modules 1 installed inside the battery housing. The battery housing includes an upper housing, a lower housing, and a sealing gasket. The number of battery modules 1 can be two, three, or more. A module reinforcing plate 2 is provided between adjacent battery modules 1. The two sides of the module reinforcing plate 2 facing the battery module 1 are respectively bonded and fixed to the corresponding battery module 1 by structural adhesive.

[0032] If we define the thickness of the structural adhesive required to satisfy the thermal expansion deformation of a single battery cell as T, then by placing a module reinforcing plate 2 between two battery modules 1, the thickness of the structural adhesive between the module reinforcing plate 2 and the battery module 1 only needs to be greater than T. By setting the module reinforcing plate 2 and reducing the thickness of each structural adhesive, the connection strength between adjacent battery modules 1 can be improved, thereby enhancing the overall structural strength of the battery pack. In practical use, since the module reinforcing plate is placed between two battery modules 1, when the cells of each battery module 1 undergo thermal expansion deformation, the thickness of the structural adhesive between the battery modules 1 (i.e., ...) will be less than T. Figure 2 (In the y-direction), the two sides of the module reinforcing plate 2 are subjected to opposite forces, which can effectively prevent the module reinforcing plate 2 from deforming and the structural adhesive from falling off.

[0033] Reference Figure 2-7As shown, to prevent structural adhesive from spreading, in one specific implementation, the module reinforcing plate 2 and the adjacent battery module 1 are each provided with adhesive-containing spaces 22 on their opposite surfaces. Each adhesive-containing space 22 has an open side, and the open side of each adhesive-containing space 22 is directly opposite the adjacent battery module 1. The module reinforcing plate is bonded to the corresponding battery module through the structural adhesive filled in the adhesive-containing spaces. All structural adhesives are in the direction of the battery module arrangement (i.e.,...). Figure 2 The y-axis (in the middle) has a set thickness to meet the needs of thermal expansion and deformation of the battery cell.

[0034] A module reinforcing plate 2 is provided between the two battery modules 1, and an adhesive-containing space 22 is provided on the module reinforcing plate 2. The adhesive-containing space 22 accommodates structural adhesive, thereby ensuring that the structural adhesive is aligned in the arrangement direction of the battery modules 1 (i.e., Figure 2 The structure has sufficient length (in the y-direction) to meet the needs of thermal expansion and deformation of the battery cell; at the same time, the adhesive space 22 is used to contain the structural adhesive, and the structural adhesive can only contact the adjacent battery module 1 through the opening of the adhesive space 22, thereby avoiding the structural adhesive from flowing around when squeezed by the battery module 1, eliminating the need for manual scraping of adhesive, saving labor and improving production efficiency.

[0035] In actual production, the module reinforcing plate 2 can be first positioned on battery module A, and then battery module B can be moved towards battery module A. Battery module B and battery module A will then compress the module reinforcing plate 2 and the structural adhesive on it, thereby achieving bonding and fixation between adjacent battery modules 1 and module reinforcing plate 2 under pressure. This enhances the overall structural strength of the battery pack and reduces the impact of the battery pack on the battery module arrangement direction (i.e.,...). Figure 2 The dimensions (in the y-direction) increase the volumetric energy density of the battery pack.

[0036] Reference Figure 2-7 As shown, specifically, in order to simplify the structure and reduce costs, as a specific implementation, the module reinforcing plate 2 includes a plate body. In the arrangement direction of the battery module, the plate surface of the plate body is a plane. The adhesive space 22 is surrounded by adhesive-blocking strips set on the plate surface of the plate body. The structure is simple and can reduce the thickness of the plate body, thereby reducing the cost of raw materials.

[0037] In other specific embodiments, refer to Figure 2-7 As shown, a groove can also be provided on the surface of the board body, which forms a glue-containing space 22. In this case, the thickness of the board body is relatively thick.

[0038] When the battery cell expands and deforms due to thermal expansion, the actual volume of the accommodating space 22 decreases, and the structural adhesive within the adhesive accommodating space 22 is squeezed by the battery cell, affecting the length and height of the board body (i.e., Figure 2In the x and z directions, the force applied by the structural adhesive to the board body will cause the board body to be elongated along the length and / or height directions, thereby increasing the actual volume of the accommodating space to balance the volume of the accommodating space 22 reduced by the thermal expansion deformation of the battery cell.

[0039] To overcome the above problems, refer to Figure 3-5 As shown in the figure, in one specific embodiment, the cross-sectional shape of the adhesive space 22 is rectangular, and the adhesive blocking strip is divided into two sets of adhesive blocking strips that form the length and width of the rectangle respectively. At least one set of adhesive blocking strips is separately set from the board body to form a split adhesive blocking strip 212. In the arrangement direction of the battery module 1, the board surface of the board body is also provided with a positioning structure 23 for positioning the split adhesive blocking strip 212. The positioning structure 23 is provided with a guide surface for guiding the split adhesive blocking strip 212 to move away from the structural adhesive. The guide surface is a guide slope or guide curved surface that is in line contact with the split adhesive blocking strip 212, and the thickness of the positioning structure 23 is less than the thickness of the split adhesive blocking strip 212.

[0040] Specifically, such as Figure 2-5 As shown, along the length direction of the plate body (i.e. Figure 2 In the x direction), a set of adhesive strips used to form a rectangle is a split adhesive strip 212, and another set of adhesive strips is integrally formed with the plate body. The positioning structure 23 is a semi-cylindrical protrusion formed by bending. At least a part of the surface of the protrusion near the corresponding split adhesive strip constitutes the guide surface. A quarter of the cylindrical surface of the semi-cylindrical protrusion constitutes the guide surface. The structure is simple.

[0041] After applying the aforementioned module reinforcement plate 2 to the battery pack, refer to Figure 2-7 As shown, when the battery cell undergoes thermal expansion and deformation, the split adhesive strip 212 tends to move away from the structural adhesive after being subjected to force. At this time, since the guiding surface is a guiding slope or guiding curve, the split adhesive strip 212 and the positioning structure 23 are in line-to-surface contact (i.e., line contact), rather than surface-to-surface contact (i.e., surface contact). When the thermal expansion and deformation of the battery cell is large, the split adhesive strip 212 will move towards the corresponding positioning structure 23 (i.e., the split adhesive strip 212 will move away from the structural adhesive), thereby expanding the volume of the accommodating space, reducing the stress between the structural adhesive and the module reinforcing plate 2, and solving the problem of stress concentration on the module reinforcing plate 2 by the structural adhesive when the battery cell expands, that is, reducing the stress on the plate body along the edge. Figure 2 The forces in the x and z directions reduce the plate body's stress. Figure 2 The deformation in the x and z directions is measured to prevent damage to the module reinforcement plate 2.

[0042] However, in other specific embodiments, all the baffle strips can be integral baffle strips 211 formed with the plate body. In this case, the module reinforcing plate 2 needs to be made of high-strength material; or, all the baffle strips can be separate baffle strips 212; or, a set of long baffle strips used to form a rectangle can be separate baffle strips 212, and another set of baffle strips can be integrally formed with the plate body. Of course, in other specific embodiments, the positioning structure 23 can also be a quarter-cylindrical protrusion, with the arc surface of the quarter-cylindrical protrusion facing the split adhesive strip 212, and the arc surface forming a guide surface; or, the positioning structure 23 can also be a right-angled triangular prism, with the inclined surface opposite the right angle facing the split adhesive strip 212, and the inclined surface forming a guide inclined surface. In this embodiment, the shape of the positioning structure 23 is not limited, as long as the positioning structure 23 meets the following conditions: the positioning structure 23 is provided with a guide inclined surface or guide curved surface for guiding the split adhesive strip 212 to move away from the structural adhesive, so that when the thermal expansion deformation of the battery cell is large, the split adhesive strip 212 can move away from the structural adhesive.

[0043] Reference Figure 2-5 As shown, when the module reinforcing plate 2 is clamped by the battery module B and the battery module A, in order to better prevent the structural adhesive from flowing around, as a specific embodiment, the module reinforcing plate 2 is also provided with an overflow space 24. The overflow space 24 is arranged next to the adhesive-containing space 22 to accommodate the structural adhesive overflowing from the adhesive-containing space 22.

[0044] Specifically, such as Figure 4 As shown, the adhesive-blocking strip is spaced at a predetermined distance from the edge of the board body, so that the side of the adhesive-blocking strip away from the adhesive-containing space 22 forms an overflow space 24 together with the board body. However, in other embodiments, a groove can be directly cut into the surface of the board body to form the overflow space 24.

[0045] Reference Figure 2-5 As shown, to facilitate the installation of the module reinforcing plate 2, in one specific embodiment, both ends of each module reinforcing plate 2 are respectively limited to the two end plates 12 of one side of the battery module 1 by guide limiting members. The module reinforcing plate 2 and the guide limiting members are movable and engaged along the arrangement direction of the battery modules 1, and when the module reinforcing plate 2 and structural adhesive are squeezed by adjacent battery modules 1, the module reinforcing plate 2 can move under the guidance of the guide limiting members. The guide limiting members can be commonly used guide limiting members such as screws, guide rods, and pop rivets 3, thereby restricting the movement direction of the module reinforcing plate 2, so that the module reinforcing plate 2 can only move under the guidance of the guide limiting members.

[0046] When installing the module reinforcing plate 2, the module reinforcing plate 2 can first be installed on the battery module A through the guide limiting component. Then, the battery module B is moved toward the battery module A. Under the pressure of the battery modules A and B, the module reinforcing plate 2 will move a set distance toward the battery module A. At this time, the module reinforcing plate 2 and the structural adhesive are fixed on the battery modules A and B under the pressure of the battery modules A and B.

[0047] However, in other specific implementations, refer to Figure 2-5 As shown, additional tooling can also be used to clamp the module reinforcing plate 2. After the battery module B and battery module A squeeze the module reinforcing plate 2 and bond it together, the tooling can be used to loosen the module reinforcing plate 2.

[0048] Reference Figure 2-7 As shown, in order to improve the volumetric energy density of the battery pack, as a specific implementation, the module reinforcing plate 2 is disposed between the two straps 11 arranged vertically on the battery module 1, thereby avoiding interference between the straps 11 and the module reinforcing plate 2 and reducing the volume of the battery pack (specifically, reducing the volume of the battery pack along the edge). Figure 2 (Dimensions in the y-direction) to improve the volumetric energy density of the battery pack.

[0049] However, in other specific implementations, refer to Figure 2-7 As shown, the battery module 1 and the strapping can also be at the same height. In this case, the distance between adjacent battery modules 2 is equal to the sum of the thickness of the module reinforcing plate 2, the thickness of the structural adhesive, and the thickness of the two strapping straps 11.

[0050] Reference Figure 2-7 As shown, in order to further improve the overall structural strength of the battery pack, as a specific implementation, a plug 4 is provided at the upper end of the strapping 11 located above. In the arrangement direction of the battery modules 1, the two ends of the plug 4 are coated with glue and bonded to the two adjacent battery modules 1, thereby increasing the connection area of ​​the two adjacent battery modules 1 and further improving the overall structural strength of the battery pack.

[0051] Meanwhile, a bottom structural adhesive 5 is provided at the bottom of the battery module 1 to bond and fix the battery module 1 and the lower housing 62, thereby further improving the overall structural strength of the battery pack.

[0052] Reference Figure 2-7 As shown, in order to facilitate the assembly of the battery pack, in one specific embodiment, the plug 4 includes an insertion part and an overlapping part. The insertion part is inserted between adjacent battery modules 1 and is bonded and fixed to the adjacent battery modules 1. The overlapping part overlaps on the upper end surface of at least one of the two battery modules 1 bonded to the insertion part.

[0053] Specifically, the plug 4 is a "T"-shaped plug, which includes an integrally formed or fixedly connected horizontal plate and a vertical plate. The vertical plate forms the insertion part, and the horizontal plate forms the overlapping part. The overlapping part overlaps with two adjacent battery modules 1. Therefore, when using battery module B and battery module A to squeeze the module reinforcing plate 2 and the plug 4, it is not necessary to use an additional working tool to fix the plug 4; the plug 4 can be directly overlapped onto the battery module 1. However, in other specific embodiments, refer to... Figure 6-7 As shown, the plug 4 can also be cuboid in shape. The plug 4 includes a clamping portion and an insertion portion inserted between the two battery modules 1. The clamping portion of the plug 4 is held by a tooling fixture, thereby ensuring that battery module B and battery module A can simultaneously compress the module reinforcing plate 2 and the plug 4. Alternatively, the plug 4 can be an inverted "L"-shaped plug, including a horizontal plate and a vertical plate. The horizontal plate forms an overlapping portion, and the vertical plate forms an insertion portion. The horizontal plate overlaps one of the two adjacent battery modules. However, in other specific embodiments, refer to... Figure 2-7 As shown, the plug block 4 can also be omitted, and only the module reinforcement plate 2 can be installed.

[0054] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack comprising at least two battery modules, characterized in that, Each adjacent battery module is provided with a module reinforcing plate. The two sides of the module reinforcing plate facing the battery module are respectively bonded and fixed to the corresponding battery module by structural adhesive. Each side of the module reinforcing plate facing the adjacent battery module has a space for adhesive. One side of each space is open, and the opening of each space is directly opposite the adjacent battery module. The module reinforcing plate is bonded to the corresponding battery module by the structural adhesive filled in the space. Each piece of structural adhesive has a set thickness in the battery module arrangement direction to meet the needs of thermal expansion and deformation of the battery cell.

2. The battery pack as described in claim 1, characterized in that, The module reinforcing plate includes a plate body, and the adhesive-containing space is surrounded by adhesive-blocking strips disposed on the surface of the plate body.

3. The battery pack as described in claim 2, characterized in that, The cross-sectional shape of the adhesive space is rectangular. The adhesive-blocking strip is divided into two sets of adhesive-blocking strips that form the length and width of the rectangle, respectively. At least one set of adhesive-blocking strips is separately set from the board body to form a split adhesive-blocking strip. The board body is also provided with a positioning structure for positioning the split adhesive-blocking strip. The positioning structure is provided with a guide surface for guiding the split adhesive-blocking strip to move away from the structural adhesive. The guide surface is a guide slope or guide curve that contacts the split adhesive-blocking strip. The thickness of the positioning structure is less than the thickness of the split adhesive-blocking strip.

4. The battery pack as described in claim 3, characterized in that, The positioning structure is a curved ridge, and at least a portion of the surface of the ridge near the corresponding split adhesive strip constitutes the guide surface.

5. The battery pack as described in claim 1, characterized in that, The module reinforcement plate includes a plate body, and the adhesive space is formed by a groove provided on the surface of the plate body.

6. The battery pack according to any one of claims 1-5, characterized in that, The module reinforcement plate is also provided with an overflow space, which is arranged next to the adhesive containment space to contain the structural adhesive that overflows from the adhesive containment space.

7. The battery pack according to any one of claims 1-5, characterized in that, Each module reinforcing plate is positioned at both ends by guide limiting components on the two end plates of one side of the battery module. The module reinforcing plate and the guide limiting components are movable and cooperate with each other along the arrangement direction of the battery modules. When the module reinforcing plate and structural adhesive are squeezed by adjacent battery modules, the module reinforcing plate can move under the guidance of the guide limiting components.

8. The battery pack according to any one of claims 1-5, characterized in that, The module reinforcement plate is placed between two straps arranged above and below the battery module. A plug is provided at the upper end of the upper strap. In the arrangement direction of the battery module, the two ends of the plug are coated with glue and bonded to the two adjacent battery modules.

9. The battery pack as described in claim 8, characterized in that, The plug includes an insertion part and an overlapping part. The insertion part is inserted between adjacent battery modules and is bonded and fixed to the adjacent battery modules. The overlapping part overlaps on the upper end surface of at least one of the two battery modules bonded to the insertion part.

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