Battery module, battery pack and power device

Abstract

A power device. The power device comprises a battery pack, and the battery pack comprises a battery module. The battery module comprises a battery cell case, battery cells and flexible structures; an accommodating cavity is formed in the battery cell case; there are multiple battery cells; the multiple battery cells are installed in the accommodating cavity; at least one end of each battery cell is fixedly connected to the battery cell case; each battery cell comprises a battery cell body, a first tab and a second tab; the battery cell bodies of every two adjacent battery cells are separated by means of a protective cover; flexible structures are arranged between each protective cover and the battery cell bodies of the battery cells separated by the protective cover, and the flexible structures are suitable for abutting against the protective cover and the battery cell bodies separated by the protective cover.

Description

Battery modules, battery packs and power equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed on July 18, 2023, with application number 202321892880.9 and patent application name “Battery module, battery pack and power equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery module, a battery pack and a power device. Background Art

[0004] The battery module includes a battery cell shell and multiple battery cells. A accommodating cavity is formed in the battery cell shell, and the multiple battery cells are arranged in the accommodating cavity. In the related art, glue is injected between the bottom of the battery cell and the battery cell shell to fix the battery cell in the accommodating cavity. The two adjacent battery cells are supported by a protective cover. However, under vibration conditions, the gap between the protective cover and the battery cell changes, and the protective cover and the battery cell are prone to collision, or the plastic film on the surface of the battery cell is prone to fatigue due to the shaking of the electrolyte inside the battery cell, which will cause the plastic film of the battery cell to be damaged, and then cause the electrolyte inside the battery cell to leak, affecting the safety of use.

[0005] Summary of the Invention

[0006] The present application aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present application proposes a battery module that is conducive to reducing the risk of damage to battery cells.

[0007] The present application also proposes a battery pack having the above-mentioned battery module.

[0008] The present application also proposes a power device having the above-mentioned battery pack.

[0009] According to an embodiment of the present application, a battery module includes: a battery cell shell, a battery cell and a flexible structure, a receiving cavity is formed in the battery cell shell, there are multiple battery cells, and the multiple battery cells are installed in the receiving cavity, at least one end of the battery cell is fixedly connected to the battery cell shell, each of the battery cells includes a battery cell body, a first pole ear and a second pole ear, the first pole ear and the second pole ear are both connected to the battery cell body, the first pole ear of one battery cell in two adjacent battery cells is connected to the second pole ear of the other battery cell, and the battery cell bodies of the two adjacent battery cells are separated by a protective cover; the flexible structure is arranged between the protective cover and the battery cell body of the battery cell separated by the protective cover, and the flexible structure is suitable for stopping the protective cover and the battery cell body separated by the protective cover.

[0010] According to the battery module of the embodiment of the present application, by arranging a flexible structure between the protective cover and the battery body of the battery cell separated by the protective cover, flexible constraints can be added to the protective cover and the battery body separated by the protective cover, thereby reducing or eliminating the shaking displacement of the battery cell during vibration, which is beneficial to reducing the risk of damage to the battery cell. At the same time, the protective cover and the battery cell will not collide due to the isolation of the flexible structure, which is also beneficial to reducing the risk of damage to the battery cell.

[0011] According to some embodiments of the present application, the flexible structure is adhered to the protective cover and / or the battery cell body separated by the protective cover.

[0012] According to some embodiments of the present application, the battery cell body includes a pole core and a plastic film, the plastic film includes a plastic film body and a plastic film extension segment, the plastic film body covers the pole core, the plastic film extension segment is connected to the plastic film body, and the first pole ear and the second pole ear are suitable for being connected to the plastic film extension segment, and the flexible structure is suitable for stopping the protective cover and the plastic film body separated by the protective cover.

[0013] According to some embodiments of the present application, the flexible structure is adhered to the extension section of the overmolding film.

[0014] According to some embodiments of the present application, the flexible structure is a combination of one or more of a foam structure, a rubber structure, and a silicone structure.

[0015] According to some embodiments of the present application, the battery cell housing includes a first plate and a second plate arranged opposite to each other, the first plate is provided with a first glue filling hole, the second plate is provided with a second glue filling hole, and both the first glue filling hole and the second glue filling hole are connected to the accommodating cavity;

[0016] A first glue pouring area is formed between one end of the battery cell and the first board, and the first glue pouring area is connected to the first glue pouring hole. A second glue pouring area is formed between the other end of the battery cell and the second board, and the second glue pouring area is connected to the second glue pouring hole.

[0017] According to some embodiments of the present application, a first glue pouring observation hole is provided on the first plate, and the first glue pouring observation hole is connected to the first glue pouring area; and / or a second glue pouring observation hole is provided on the second plate, and the second glue pouring observation hole is connected to the second glue pouring area.

[0018] According to some embodiments of the present application, the first glue filling hole, the second glue filling hole, the first glue filling observation hole and the second glue filling observation hole are all provided with sealing pieces, and the sealing pieces are used to seal the corresponding holes.

[0019] According to some embodiments of the present application, the plurality of battery cells are divided into a plurality of battery cell groups, the plurality of battery cell groups are arranged sequentially along a first direction, two adjacent battery cell groups are separated by corresponding protective covers, and the flexible structure is provided between the protective cover and the battery cell groups separated by the protective cover.

[0020] According to some embodiments of the present application, each of the battery cell groups is aligned with at least one of the first glue filling holes and at least one of the second glue filling holes.

[0021] According to some embodiments of the present application, the first plate is located in the second direction of the second plate, and in the third direction, the plurality of battery cells are divided into multiple rows, and two adjacent rows of battery cells are separated by partitions, and each row of battery cells is aligned with at least one of the first glue filling holes and at least one of the second glue filling holes, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0022] According to some embodiments of the present application, the battery module also includes a die-cut protective film, which is located in the accommodating cavity and covers the battery cell. An avoidance gap is provided on the die-cut protective film, and the projections of the first glue filling hole, the second glue filling hole, the first glue filling observation hole and the second glue filling observation hole on the die-cut protective film are located in the corresponding avoidance gaps.

[0023] According to some embodiments of the present application, the battery module further includes a protective sheet, which is attached to the corner structure of the outer surface of the battery cell. The corner structure includes an edge formed by the intersection of two non-coplanar planes and / or a sharp corner formed by the intersection of three non-coplanar planes.

[0024] According to some embodiments of the present application, the battery module further includes a collection line, which at least partially extends into the accommodating cavity, and the battery cell is connected to the collection line.

[0025] According to another embodiment of the present application, a battery pack includes a tray, a heat exchange plate, a bottom guard plate, a cover plate and the above-mentioned battery module; the heat exchange plate is installed on the tray, the heat exchange plate has a heat exchange channel, and a mounting cavity is formed above the heat exchange plate; the bottom guard plate is located below the heat exchange plate, and the bottom guard plate is installed on the tray; the battery module is located in the mounting cavity, the battery module is in direct contact with the heat exchange plate, or a heat-conducting structure is provided between the battery module and the heat exchange plate; the cover plate is installed on the tray, and the battery module is located between the heat exchange plate and the cover plate.

[0026] According to the battery pack of the embodiment of the present application, by arranging a flexible structure between the protective cover and the battery body of the battery cell separated by the protective cover, flexible constraints can be added to the protective cover and the battery body separated by the protective cover, thereby reducing or eliminating the shaking displacement of the battery body during vibration, which is beneficial to reducing the risk of structural fatigue wear or even direct wear on the surface of the battery body. At the same time, the protective cover and the battery body will not collide due to the isolation of the flexible structure, which is also beneficial to reducing the risk of damage to the battery body.

[0027] According to some embodiments of the present application, the plurality of battery modules are arranged in multiple rows and columns, and the battery pack further includes multiple pressure plates, which are located between the battery modules and the cover plate, and are connected to the tray. The battery modules in the same row or column are connected to the corresponding pressure plates.

[0028] According to some embodiments of the present application, the battery pack also includes electrical components, which are installed on the tray and located at one end of the battery module in the first direction. The other end of the battery module in the first direction and both sides of the battery module in the third direction are provided with side insulation layers and insulating brackets. The two ends of the battery module in the first direction are provided with end insulation layers. The side insulation layers, the insulating brackets and the end insulation layers are all located in the installation cavity, and a top insulation layer is provided between the cover plate and the battery module.

[0029] According to another embodiment of the present application, a power device includes the above-mentioned battery pack.

[0030] According to the power equipment of the embodiment of the present application, the battery pack thereof can add flexible constraints to the protective cover and the battery body separated by the protective cover by arranging a flexible structure between the protective cover and the battery body of the battery cell separated by the protective cover, thereby reducing or eliminating the shaking displacement of the battery body during vibration, which is beneficial to reducing the risk of structural fatigue wear or even direct wear on the surface of the battery body. At the same time, the protective cover and the battery body will not collide due to the isolation of the flexible structure, which is also beneficial to reducing the risk of damage to the battery body.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of a battery module according to an embodiment of the present application;

[0033] FIG2 is a perspective schematic diagram of a single battery cell;

[0034] FIG3 is a cross-sectional schematic diagram of the plastic film, the first tab, and the second tab;

[0035] Figure 4 is a schematic diagram of the positions of the flexible structure, protective cover, and battery cells;

[0036] FIG5 is a perspective schematic diagram of a battery cell housing from one perspective;

[0037] FIG6 is a perspective schematic diagram of a battery cell housing from another perspective;

[0038] FIG7 is a schematic diagram of a battery pack according to an embodiment of the present application;

[0039] FIG8 is a schematic diagram of a power device according to an embodiment of the present application.

[0040] Figures: Power equipment 1000, battery pack 100, battery module 10, battery cell shell 1, first plate 11, first glue filling hole 111, first glue filling observation hole 112, second plate 12, second glue filling hole 121, second glue filling observation hole 122, third plate 13, fourth plate 14, accommodating cavity 15, battery cell 2, first battery cell group 21, second battery cell group 22, third battery cell group 23, fourth battery cell group 24, battery cell body 25, plastic film 251, plastic film body 2511, plastic film extension section 2512, bending portion 2513, first pole ear 26, second pole ear 27, blocking piece 3, protective cover 4, first protective cover 41, first Second protective cover 42, third protective cover 43, fourth protective cover 44, protective spacer 45, connecting fixing part 46, partition 51, die-cut protective film 52, avoidance gap 521, collection line 53, first rubber block 61, second rubber block 62, third rubber block 63, fourth rubber block 64, fifth rubber block 65, sixth rubber block 66, seventh rubber block 67, eighth rubber block 68, first protective sheet 71, second protective sheet 72, third protective sheet 73, fourth protective sheet 74, fifth protective sheet 75, flexible structure 8; tray 20, lifting ear 201, heat exchange plate 30, water inlet pipe 301, water outlet pipe 302, bottom guard plate 40, cover plate 50, pressure plate 60, electrical component 70, insulating bracket 801, side insulation layer 802, end insulation layer 803, top insulation layer 804, installation cavity 90. DETAILED DESCRIPTION

[0041] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0042] In the description of this application, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0043] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0044] The battery module 10 , the battery pack 100 including the battery module 10 , and the power device 1000 including the battery pack 100 according to an embodiment of the present application are described in detail below with reference to FIG. 1 to FIG. 8 .

[0045] 1 to 6 , a battery module 10 according to an embodiment of the present application may include a battery cell housing 1 , a battery cell 2 , and a flexible structure 8 .

[0046] 1 , a receiving cavity 15 is formed in the battery cell shell 1, and a plurality of battery cells 2 are installed in the receiving cavity 15, and at least one end of the battery cell 2 is fixedly connected to the battery cell shell 1, for example, the bottom of the battery cell 2 is glued and fixed to the battery cell shell 1, or the top and bottom of the battery cell 2 are both glued and fixed to the battery cell shell 1.

[0047] As shown in Figures 1-4 , each battery cell 2 includes a battery body 25, a first tab 26, and a second tab 27. The first tab 26 and the second tab 27 are both connected to the battery body 25. The first tab 26 of one of two adjacent battery cells 2 is connected to the second tab 27 of the other. The battery bodies 25 of two adjacent battery cells 2 are separated by a protective cover 4. A flexible structure 8 is disposed between the protective cover 4 and the battery body 25 of the battery cell 2 separated by the protective cover 4. The flexible structure 8 is adapted to abut the protective cover 4 against the battery body 25 separated by the protective cover 4. The flexible structure 8 has a certain degree of flexibility, allowing for moderate deformation. The flexible structure 8 abuts against the protective cover 4 and the battery body 25 in both the first direction (F1 / F2) and the third direction (F5 / F6), thereby reducing or eliminating the shaking displacement of the battery body 25 caused by vibration and reducing fatigue on the surface of the battery body 25.

[0048] 2-3 , the first tab 26 and the second tab 27 are located at both ends of the cell body 25 , so that the first tab 26 of one cell can be connected to the second tab 27 of another cell.

[0049] In the related art, two adjacent battery cells are supported by a protective cover, and glue is only injected between the bottom of the battery cell and the battery cell shell. There is no contact constraint between the battery cell and the protective cover. Under vibration conditions, the gap between the protective cover and the battery cell changes, and the protective cover and the battery cell are prone to collision. Or the plastic film on the surface of the battery cell is prone to fatigue due to the shaking of the electrolyte inside the battery cell, which will cause the plastic film of the battery cell to be damaged, and then cause the electrolyte inside the battery cell to leak, affecting the safety of use. According to the battery module 10 of the embodiment of the present application, by providing a flexible structure 8 between the protective cover 4 and the battery body 25 of the battery cell 2 separated by the protective cover 4, it is possible to increase the flexible constraint of the protective cover 4 and the battery body 25 separated by the protective cover 4, thereby reducing or eliminating the shaking displacement of the battery cell 2 during vibration, reducing the risk of structural fatigue wear or even direct wear on the surface of the battery body 25, and at the same time, the protective cover 4 and the battery cell 2 will not collide due to the isolation of the flexible structure 8, which is conducive to reducing the risk of damage to the battery cell 2.

[0050] In some embodiments of the present application, the flexible structure 8 is attached to the protective cover 4 and / or the battery cell body 25 separated by the protective cover 4. Specifically, for a single flexible structure 8, the flexible structure 8 may be attached only to the protective cover 4, or only to the battery cell body 25 separated by the protective cover 4. Alternatively, half of the flexible structure 8 may be attached to the protective cover 4, and the other half may be attached to the battery cell body 25 separated by the protective cover 4.

[0051] Optionally, as shown in Figure 4, there can be multiple flexible structures 8, and the multiple flexible structures 8 have multiple pasting combinations. For example, all flexible structures 8 can be pasted on the protective cover 4, or all flexible structures 8 can be pasted on the battery cell body 25 separated by the protective cover 4, or part of the flexible structure 8 can be pasted on the protective cover 4, and the other part of the flexible structure 8 can be pasted on the battery cell body 25 separated by the protective cover 4.

[0052] In some embodiments of the present application, as shown in Figures 2 to 4, the battery cell body 25 includes a pole core and a plastic film 251, the plastic film 251 includes a plastic film body 2511 and a plastic film extension section 2512, the plastic film body 2511 covers the pole core, the plastic film extension section 2512 is connected to the plastic film body 2511, and the first pole ear 26 and the second pole ear 27 are suitable for being connected to the plastic film extension section 2512, the flexible structure 8 is suitable for stopping the protective cover 4 and the plastic film body 2511 of the battery cell separated by the protective cover 4, so that the flexible structure 8 can add flexible constraints to the protective cover 4 and the plastic film body 2511, similarly, the flexible structure 8 is also suitable for stopping the protective cover 4 and the plastic film extension section 2512 of the battery cell separated by the protective cover 4, so that the flexible structure 8 can add flexible constraints to the protective cover 4 and the plastic film extension section 2512. Therefore, the flexible structure 8 can reduce or eliminate the shaking displacement of the battery cell 2 during vibration. Even if the electrolyte inside the battery cell 2 shakes, most of the impact force caused by the shaking on the plastic film body 2511 will be absorbed by the flexible structure 8, reducing the fatigue risk of the plastic film body 2511 and the plastic film extension section 2512, and the bending part 2513 of the plastic film 511 is not easily damaged.

[0053] Optionally, the plastic film 251 is an aluminum-plastic film, which is low in cost. The protective cover 4 is a plastic part, which can support the battery cell 2 without interfering with the electrical connection between the battery cells.

[0054] When the battery pack 100 including the above-mentioned battery module 10 is mounted on a power device (taking a vehicle as an example), the road excitation will be transmitted to the vehicle body and then to the battery pack 100. When the battery pack 100 vibrates, the internal battery cells 2, especially the core area wrapped by the plastic film 251, will have a certain amount of displacement in all directions due to their large mass. There is a gap area between the battery cell body 25 and the protective cover 4. The extended section 2512 of the plastic film will produce a small displacement as the core area wrapped by the plastic film 251 moves. Over time, the extended section 2512 of the plastic film and the bent portion 2513 of the plastic film body 2511 will suffer from structural fatigue wear or even direct wear, thereby causing electrolyte leakage, and then the battery pack 100 will have the risk of short circuit, arcing or even fire. By arranging a flexible structure 8 between the protective cover 4 and the battery cell body 25 separated by the protective cover 4, flexible constraints can be added to the protective cover 4 and the battery cell body 25 separated by the protective cover 4, thereby reducing or eliminating the shaking displacement of the battery cell 2 during vibration, and reducing the structural fatigue wear or even direct wear risk of the extended section 2512 of the plastic film and the bent portion 2513 of the plastic film body 2511. At the same time, the protective cover 4 and the plastic film body 2511 and the extended section 2512 of the plastic film will not collide due to the isolation of the flexible structure 8, which is beneficial to reducing the risk of damage to the plastic film 251.

[0055] The flexible structure 8 abuts against the protective cover 4 and the bent portion 2513 of the overmolding film body 2511 in the first direction (F1 / F2), and the flexible structure 8 abuts against the protective cover 4 and the overmolding film extension section 2512 in the third direction (F5 / F6), thereby reducing or eliminating the shaking displacement of the overmolding film 251 on the surface of the pole core caused by the vibration of the battery pack 100 when the vehicle is used, reducing the fatigue of the overmolding film 251, and reducing the degree of fatigue wear of the overmolding film 251, thereby reducing or avoiding the risk of electrolyte leakage caused by wear of the overmolding film 251, and ultimately achieving the purpose of effectively improving the durability, reliability and safety of the battery pack 100.

[0056] In some embodiments of the present application, in combination with Figures 3-4, the flexible structure 8 is adhered to the extended section 2512 of the plastic film. In this way, the flexible structure 8 is far away from the pole core. Therefore, the heat generated when the battery module 10 is working has little effect on the adhesive on the back of the flexible structure 8, and the flexible structure 8 is not easy to fall off.

[0057] In some embodiments of the present application, the flexible structure 8 is a combination of one or more of a foam structure, a rubber structure, and a silicone structure. For example, in the example of FIG3 , the flexible structures 8 are all foam structures. Of course, in other optional embodiments, some of the flexible structures 8 are foam structures and others are rubber structures, or some of the flexible structures 8 are foam structures and others are silicone structures, or some of the flexible structures 8 are foam structures, some are rubber structures, and others are silicone structures.

[0058] According to the battery module 10 of the present application embodiment, without changing the structural design of the main components, a moderately deformable flexible structure 8 (e.g., foam) is added and bonded to the interface between the battery cell 2 and the protective cover 4 within the battery module 10. This reduces design and manufacturing complexity, requiring minimal changes to mass production line equipment and processes. The flexible structure 8 effectively suppresses displacement and fatigue of the overmolding film 251, alleviating or avoiding issues such as reduced durability and reliability of the battery pack 100 caused by fatigue wear or leakage of the overmolding film 251, as well as safety issues such as leakage, short circuiting, and arcing.

[0059] In some embodiments of the present application, the battery cell housing 1 includes a first plate 11 and a second plate 12. The first plate 11 and the second plate 12 are arranged opposite each other. A first glue pouring hole 111 is formed on the first plate 11, and a second glue pouring hole 121 is formed on the second plate 12. The first glue pouring hole 111 and the second glue pouring hole 121 are both connected to the accommodating cavity 15. Glue can be poured into the accommodating cavity 15 through the first glue pouring hole 111 and the second glue pouring hole 121.

[0060] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0061] A first glue filling area is formed between one end (e.g., the top) of the battery cell 2 and the first plate 11, and the first glue filling area is connected to the first glue filling hole 111. A second glue filling area is formed between the other end (e.g., the bottom) of the battery cell 2 and the second plate 12, and the second glue filling area is connected to the second glue filling hole 121. When glue is poured into the accommodating cavity 15 through the first glue filling hole 111, the glue enters the first glue filling area, and the glue in the first glue filling area solidifies, thereby bonding the battery cell 2 to the first plate 11. When glue is poured into the accommodating cavity 15 through the second glue filling hole 121, the glue enters the second glue filling area, and the glue in the second glue filling area solidifies, thereby bonding the battery cell 2 to the second plate 12. In this way, both ends of the battery cell 2 are glued and fixed to the battery cell shell 1, and the battery cell 2 is more firmly installed inside the battery shell. The battery cell 2 is not easy to shake, which is beneficial to improving the first-order natural frequency of the battery module 10 itself.

[0062] 5-6 , the cell housing 1 further includes a third plate 13 and a fourth plate 14 . The third plate 13 and the fourth plate 14 are arranged opposite to each other, and one end of the third plate 13 and one end of the fourth plate 14 are connected to the first plate 11 , and the other end of the third plate 13 and the other end of the fourth plate 14 are connected to the second plate 12 . The first plate 11 , the third plate 13 , the second plate 12 , and the fourth plate 14 together enclose a receiving cavity 15 .

[0063] The single battery cell 2 is constructed as a flat structure, the battery cell shell 1 is constructed as a long strip structure, the size of the battery module 10 in the first direction (F1 / F2) is much larger than its size in the second direction (F3 / F4) and in the third direction (F5 / F6). At the same time, the size of the battery module 10 in the third direction (F5 / F6) is smaller than the size of the battery module 10 in the second direction (F3 / F4), so that the battery module 10 is thinner as a whole, and the battery module 10 is formed into a blade module. In this way, the third plate 13 and the fourth plate 14 are large surfaces, and the first plate 11 and the second plate 12 are narrow surfaces. After the narrow surfaces on both sides of the battery module 10 are glued, the first-order natural frequency of the battery module 10 is increased. For the battery pack 100 including the battery module 10, the modal of the entire battery pack 100 is improved accordingly. When the battery pack 100 is mounted on the power equipment 1000 (taking the whole vehicle as an example) during the entire service life cycle vibration condition, the occurrence of resonance can be reduced, and ultimately the vibration resistance reliability, structural strength and service life of the entire battery pack 100 after being mounted on the power equipment 1000 can be improved.

[0064] Optionally, the battery cell housing 1 is an aluminum shell, which is low in cost and light in weight.

[0065] The position and size of the first glue hole 111 and the second glue hole 121 are determined according to the size of the battery cell 2, the viscosity or fluidity of the glue, and the first-order natural frequency target of the battery module 10 to be achieved in the design. The purpose is to ensure that the glue injected into the battery module 10 through the glue holes and a suitable glue filling process can meet the design expectations, that is, the overflow length and area on both sides of the narrow surface of the battery module 10 meet the design requirements, thereby achieving the expected design effect of bonding the battery cell shell 1 and the battery cell 2.

[0066] In the related art, glue is only injected between the bottom of the battery cell 2 and the battery cell housing 1, and the battery cell 2 cannot be contact-constrained on other surfaces. This fixing method will result in a low upper limit of the first-order natural frequency of the battery module 10, thereby resulting in a low upper limit of the modal state of the battery pack 100. Under vibration conditions, resonance is more likely to occur, causing structural damage to the battery pack 100, resulting in poor durability and reliability of the battery pack 100 after being assembled in the power equipment 1000. According to the battery module 10 of the embodiment of the present application, by gluing both ends of the battery cell 2 (for example, the top and bottom of the battery cell 2) to the battery cell housing 1, the first-order natural frequency of the battery module 10 itself can be effectively increased. When the battery pack 100 includes this battery module 10, the modal state of the entire battery pack 100 is improved. After the battery pack 100 is mounted on the power equipment 1000, the occurrence of resonance can be reduced under vibration conditions throughout the service life cycle, ultimately improving the vibration resistance reliability, structural strength and service life of the entire battery pack 100 after being mounted on the power equipment 1000.

[0067] In some embodiments of the present application, a first glue filling observation hole 112 is provided on the first plate 11, and the first glue filling observation hole 112 is connected to the first glue filling area. Through the first glue filling observation hole 112, the glue filling situation in the first glue filling area can be observed at any time. For example, the position after the glue flows, that is, the area of ​​the glue connecting the battery cell shell 1 and the battery cell 2 can be observed, so as to ensure that the glue effectively bonds the battery cell 2 to the battery cell shell 1, and ultimately achieve the purpose of increasing the first-order natural frequency of the single battery module 10. For example, the amount of glue in the first glue filling area can be observed to avoid excessive glue filling in the first glue filling area and causing the glue to overflow. In the examples of Figures 1 and 5, a first glue filling observation hole 112 is provided on both sides of each first glue filling hole 111, which is convenient for observing the glue filling situation in the first glue filling area from both sides of the first glue filling hole 111. The first glue pouring observation hole 112 passes through the first plate 11 in a straight line. Thus, the first glue pouring observation hole 112 is a straight hole with no obstructions within the visual range, making it easy to directly observe the glue pouring situation in the first glue pouring area from the outer end of the first glue pouring observation hole 112 .

[0068] In some embodiments of the present application, a second glue filling observation hole 122 is provided on the second plate 12, and the second glue filling observation hole 122 is connected to the second glue filling area. Through the second glue filling observation hole 122, the glue filling situation in the second glue filling area can be observed at any time. For example, the position after the glue flows, that is, the area of ​​the glue connecting the battery cell shell 1 and the battery cell 2 can be observed, so as to ensure that the glue effectively bonds the battery cell 2 to the battery cell shell 1, and ultimately achieve the purpose of increasing the first-order natural frequency of the single battery module 10. For example, the amount of glue in the second glue filling area can be observed to avoid excessive glue filling in the second glue filling area, which may cause the glue to overflow. In the example of Figure 6, a second glue filling observation hole 122 is provided on both sides of each second glue filling hole 121, which is convenient for observing the glue filling situation in the second glue filling area from both sides of the second glue filling hole 121. The second glue pouring observation hole 122 passes through the second plate 12 in a straight line. In this way, the second glue pouring observation hole 122 is a straight hole with no obstructions within the visual range, making it easy to directly observe the glue pouring situation in the second glue pouring area from the outer end of the second glue pouring observation hole 122 .

[0069] In some embodiments of the present application, a blocking piece 3 is provided at each of the first glue pouring hole 111, the second glue pouring hole 121, the first glue pouring observation hole 112, and the second glue pouring observation hole 122. The blocking piece 3 is used to seal the corresponding holes. By providing the blocking piece 3, the colloid in the first glue pouring area can be prevented from flowing out of the first glue pouring hole 111 and the first glue pouring observation hole 112, and the colloid in the second glue pouring area can be prevented from flowing out of the second glue pouring hole 121 and the second glue pouring observation hole 122. Specifically, the area of ​​the blocking piece 3 is larger than the area of ​​the corresponding hole, so that the blocking piece 3 can completely cover the corresponding hole, reducing the possibility of glue leakage at the first glue pouring hole 111, the second glue pouring hole 121, the first glue pouring observation hole 112, and the second glue pouring observation hole 122.

[0070] Optionally, the blocking piece 3 is a PP (Polypropylene) sheet. The shape of the blocking piece 3 can be circular, square, triangular, etc.

[0071] Optionally, the first glue pouring hole 111 and the second glue pouring hole 121 can be aligned, and the first glue pouring observation hole 112 and the second glue pouring observation hole 122 can be aligned. This facilitates the processing of the first glue pouring hole 111, the second glue pouring hole 121, the first glue pouring observation hole 112, and the second glue pouring observation hole 122. Of course, the first glue pouring hole 111 and the second glue pouring hole 121 can also be misaligned, and the first glue pouring observation hole 112 and the second glue pouring observation hole 122 can also be misaligned. It is understood that the alignment of two holes can mean that the axes of the two holes are collinear.

[0072] In some embodiments of the present application, a plurality of battery cells 2 may be connected in series, or a portion of the battery cells 2 may be connected in series and another portion of the battery cells 2 may be connected in parallel.

[0073] Optionally, the battery cell 2 is a soft-pack battery cell.

[0074] In some embodiments of the present application, a plurality of battery cells 2 are divided into a plurality of battery cell groups, and the plurality of battery cell groups are arranged in sequence along the first direction (F1 / F2), and two adjacent battery cell groups are separated by corresponding protective covers 4. For example, two adjacent battery cell groups are welded in series, and the welding points of the two adjacent battery cell groups are supported by the protective cover 4. The above-mentioned flexible structure 8 is provided between the protective cover 4 and the battery cell groups separated by the protective cover 4. In the example of Figure 1, the number of battery cell groups is four, and the four battery cell groups include a first battery cell group 21, a second battery cell group 22, a third battery cell group 23, and a fourth battery cell group 24. The first battery cell group 21, the second battery cell group 22, the third battery cell group 23, and the fourth battery cell group 24 are arranged in sequence along the first direction (F1 / F2). In other words, the plurality of battery cells 2 are divided into a plurality of columns, and each battery cell group is a column.

[0075] Furthermore, the first cell group 21 and the second cell group 22 are separated by a first protective cover 41, the second cell group 22 and the third cell group 23 are separated by a second protective cover 42, and the third cell group 23 and the fourth cell group 24 are separated by a third protective cover 43, thereby achieving physical isolation between any two adjacent cell groups among the first cell group 21, the second cell group 22, the third cell group 23, and the fourth cell group 24. Specifically, the first protective cover 41, the second protective cover 42, and the third protective cover 43 are all plastic parts, which can support the cell groups without interfering with the electrical connections between the cell groups.

[0076] A fourth protective cover 44 is provided at one end of the plurality of cell groups, and a protective spacer 45 and a connecting fixture 46 are provided at the other end. As shown in FIG1 , the fourth cell group 24 is provided with the fourth protective cover 44 at the end facing away from the third cell group 23, and the first cell group 21 is provided with the protective spacer 45 and the connecting fixture 46 at the end facing away from the second cell group 22. Specifically, the fourth protective cover 44, protective spacer 45, and connecting fixture 46 are all made of plastic, which can improve the insulation performance between the cell group and the cell housing 1 while supporting the cell group.

[0077] In the example of FIG. 4 , the first battery cell group 21 , the second battery cell group 22 and the first protective cover 41 are taken as examples to illustrate the installation position of the flexible structure 8 . Specifically, the first battery cell group 21 includes a first group of first battery cells 211 and a first group of second battery cells 212, the first pole ear 26 of the first group of first battery cells 211 is connected to the second pole ear 27 of the first group of second battery cells 212, and a flexible structure 8 is provided between the plastic film body 2511a of the first group of first battery cells 211 and the first protective cover 41, between the plastic film extension section 2512a of the first group of first battery cells 211 and the first protective cover 41, between the plastic film body 2511b of the first group of second battery cells 212 and the first protective cover 41, and between the plastic film extension section 2512b of the first group of second battery cells 212 and the first protective cover 41, and the flexible structure 8 is adhered to the plastic film extension section 2512a of the first group of first battery cells 211 and the plastic film extension section 2512b of the first group of second battery cells 212.

[0078] Similarly, the second battery cell group 22 includes a second group of first battery cells 221 and a second group of second battery cells 222, and the first pole ear 26 of the second group of first battery cells 221 is connected to the second pole ear 27 of the second group of second battery cells 222. A flexible structure 8 is provided between the plastic film body 2511c of the second group of first battery cells 221 and the first protective cover 41, between the plastic film extension section 2512c of the second group of first battery cells 221 and the first protective cover 41, between the plastic film body 2511d of the second group of second battery cells 222 and the first protective cover 41, and between the plastic film extension section 2512d of the second group of second battery cells 222 and the first protective cover 41, and the flexible structure 8 is adhered to the plastic film extension section 2512c of the second group of first battery cells 221 and the plastic film extension section 2512d of the second group of second battery cells 222.

[0079] Of course, a flexible structure 8 is provided between the second battery cell group 22, the second protective cover 42 and the third battery cell group 23, and between the third battery cell group 23, the third protective cover 43 and the fourth battery cell group 24. The installation method is similar to the installation method of the flexible structure 8 at the position of the first protective cover 41, and will not be repeated here.

[0080] In some embodiments of the present application, the number of first glue filling holes 111 is not less than the number of battery cell groups, and the number of second glue filling holes 121 is not less than the number of battery cell groups. Each battery cell group is aligned with at least one first glue filling hole 111 and at least one second glue filling hole 121. It should be noted that the alignment of the glue filling holes with the battery cell groups means that the axial projection of the glue filling holes is located on the battery cell groups. This ensures that each battery cell group can be effectively glued, thereby improving the installation security of each battery cell group in the battery cell housing 1. In the specific examples of Figures 1 and 4-6, the multiple battery cell groups include a first battery cell group 21, a second battery cell group 22, a third battery cell group 23, and a fourth battery cell group 24. The first battery cell group 21, the second battery cell group 22, the third battery cell group 23, and the fourth battery cell group 24 are arranged sequentially along the first direction (F1 / F2). The number of the first glue filling holes 111 and the second glue filling holes 121 is the same as the number of the battery cell groups, that is, the number of the battery cell groups is four, the number of the first glue filling holes 111 is four, and the number of the second glue filling holes 121 is four. Each column of battery cell groups is aligned with one first glue filling hole 111 and one second glue filling hole 121. Each column of battery cell groups is also aligned with two first glue filling observation holes 112 and two second glue filling observation holes 122. After glue is poured into the first glue pouring area through the first glue pouring hole 111 and glue is poured into the second glue pouring area through the second glue pouring hole 121, a first glue block 61 is formed between the first battery cell group 21 and the first board 11, a fifth glue block 65 is formed between the first battery cell group 21 and the second board 12, a second glue block 62 is formed between the second battery cell group 22 and the first board 11, a sixth glue block 66 is formed between the second battery cell group 22 and the second board 12, a third glue block 63 is formed between the third battery cell group 23 and the first board 11, a seventh glue block 67 is formed between the third battery cell group 23 and the second board 12, a fourth glue block 64 is formed between the fourth battery cell group 24 and the first board 11, and an eighth glue block 68 is formed between the fourth battery cell group 24 and the second board 12.

[0081] In some embodiments of the present application, the first plate 11 is located in the second direction (F3 / F4) of the second plate 12, for example, the first plate 11 is located on the F3 side of the second plate 12, and in the third direction (F5 / F6), the plurality of battery cells 2 are divided into multiple rows, and two adjacent rows of battery cells 2 are separated by a partition 51, and the partition 51 can support the two adjacent rows of battery cells 2. Optionally, the partition 51 is a plastic partition. Each row of battery cells 2 is aligned with at least one first glue injection hole 111 and at least one second glue injection hole 121, wherein the first direction (F1 / F2), the second direction (F3 / F4), and the third direction (F5 / F6) are perpendicular to each other. In the example of Figure 1, in the third direction (F5 / F6), the plurality of battery cells 2 are divided into two rows, and the two rows of battery cells 2 are separated by a partition 51. Each row of battery cells 2 is aligned with four first glue filling holes 111 and four second glue filling holes 121 , and each row of battery cells 2 is also aligned with eight first glue filling observation holes 112 and eight second glue filling observation holes 122 .

[0082] In some embodiments of the present application, as shown in conjunction with Figures 1, 5, and 6, the battery module 10 may further include a die-cut protective film 52. The die-cut protective film 52 is positioned within the accommodating cavity 15 and covers the battery cell 2. A clearance notch 521 is provided on the die-cut protective film 52. The projections of the first glue injection hole 111, the second glue injection hole 121, the first glue injection observation hole 112, and the second glue injection observation hole 122 on the die-cut protective film 52 are positioned within the corresponding clearance notches 521. In other words, the die-cut protective film 52 does not affect the injection of glue into the first glue injection area and the second glue injection area. The clearance notches 521 can be small notches corresponding one-to-one with the first glue injection hole 111, the second glue injection hole 121, the first glue injection observation hole 112, and the second glue injection observation hole 122, or they can be elongated notches that can correspond to multiple first glue injection holes 111 and the first glue injection observation hole 112, or multiple second glue injection holes 121 and the second glue injection observation hole 122.

[0083] In some embodiments of the present application, referring to FIG1 , the battery module 10 may further include a protective sheet, which is attached to the corner structure of the outer surface of the battery cell 2. The corner structure includes an edge formed by the intersection of two non-coplanar planes and / or a sharp angle formed by the intersection of three non-coplanar planes. For example, when the battery cell 2 is a rectangular parallelepiped structure, protective sheets are attached to the eight vertex corners of the battery cell 2. Optionally, the protective sheet can be glued and attached to the corner structure of the outer surface of the battery cell 2. The protective sheet can protect the corner structure and reduce the chance of damage to the battery cell 2.

[0084] In the specific examples of Figures 1, 5, and 6, the plurality of cell groups include a first cell group 21, a second cell group 22, a third cell group 23, and a fourth cell group 24. The first cell group 21, the second cell group 22, the third cell group 23, and the fourth cell group 24 are arranged sequentially along a first direction (F1 / F2). A first protective sheet 71 is provided at an end of the first cell group 21 away from the second cell group 22. The first cell group 21 and the second cell group 22 share the second protective sheet 72. The second cell group 22 and the third cell group 23 share the third protective sheet 73. The third cell group 23 and the fourth cell group 24 share the fourth protective sheet 74. A fifth protective sheet 75 is provided at an end of the fourth cell group 24 away from the third cell group 23.

[0085] In some embodiments of the present application, the battery module 10 may further include a collection line 53, which at least partially extends into the accommodating cavity 15, and the battery cell 2 is connected to the collection line 53. The collection line 53 is used to collect information of the battery cell 2, such as voltage, current and other information.

[0086] Optionally, the acquisition line 53 is a flexible acquisition line. In a specific example, the positive and negative voltages of the battery cells 2 are respectively acquired through the flexible acquisition line 53 and transmitted to the battery controller.

[0087] According to the embodiment of the present application, the battery module 10 is a blade module, and a first glue filling hole 111 is opened on the top narrow surface of the battery cell shell 1 (i.e., the first plate 11) for glue filling, and a second glue filling hole 121 is opened on the bottom narrow surface of the battery cell shell 1 (i.e., the second plate 12) for glue filling. At the same time, a first glue filling observation hole 112 and a second glue filling observation hole 122 are usually opened to observe the flow of glue on the narrow surface of the battery cell shell 1 after glue filling, to ensure that the glue can effectively cover and bond the inner side of the narrow surface of the battery cell shell 1 and the corresponding side of the battery cell 2. After the glue is cured, it plays a role in connecting and fixing the battery cell 2 and the battery cell shell 1, that is, by filling glue on the narrow surfaces on both sides of the blade module, the first-order natural frequency of the single blade module itself is effectively improved, thereby improving the mode of the entire battery pack 100, and reducing the fatigue damage to the battery pack 100 structure caused by the resonance caused by low-frequency vibration when the battery pack 100 is mounted on a complete vehicle, thereby improving the structural reliability and durability of the battery pack 100.

[0088] 7 , a battery pack 100 according to another embodiment of the present application may include a tray 20 , a heat exchange plate 30 , a bottom guard plate 40 , a cover plate 50 , and the battery module 10 of the above embodiment.

[0089] The heat exchange plate 30 is mounted on the tray 20. The heat exchange plate 30 has a heat exchange channel, and a heat exchange medium is provided in the heat exchange flow channel. Optionally, the heat exchange medium can be a liquid or a gas, such as water or helium. When the battery module 10 needs to be cooled, a low-temperature heat exchange medium is introduced into the heat exchange plate 30 to absorb the heat of the battery module 10; when the battery module 10 needs to be heated, a high-temperature heat exchange medium is introduced into the heat exchange plate 30 to transfer heat to the battery module 10, thereby achieving thermal management of the battery module 10. In the example of Figure 7, the heat exchange plate 30 is a water-cooled plate, the water inlet pipe 301 is connected to the water inlet of the heat exchange plate 30, and the water outlet pipe 302 is connected to the water outlet of the heat exchange plate 30. The water inlet pipe 301 and the water outlet pipe 302 can be connected to a thermal management system such as a water pump and a valve to achieve circulation of cooling water between the heat exchange channel and the outside world.

[0090] The bottom guard plate 40 is located below the heat exchange plate 30 and is mounted on the tray 20. The bottom guard plate 40 is used to protect the bottom of the heat exchange plate 30 and prevent sand and gravel under the battery pack 100 from penetrating the heat exchange plate 30. Optionally, the bottom guard plate 40 can be mounted on the tray 20 using fasteners such as bolts or rivets.

[0091] An installation cavity 90 is formed above the heat exchange plate 30, and the battery module 10 is located in the installation cavity 90. The battery module 10 is in direct contact with the heat exchange plate 30, or a heat-conducting structure is provided between the battery module 10 and the heat exchange plate 30. The heat-conducting structure can be a heat-conducting glue or a heat-conducting pad, etc.

[0092] The cover plate 50 is mounted on the tray 20 , and the battery module 10 is located between the heat exchange plate 30 and the cover plate 50 .

[0093] Optionally, there are one or more battery modules 10 .

[0094] According to the battery pack 100 of the embodiment of the present application, by providing a flexible structure 8 between the protective cover 4 and the cell body 25 of the battery cell 2 separated by the protective cover 4, it is possible to increase flexible constraints on the protective cover 4 and the cell body 25 separated by the protective cover 4, thereby reducing or eliminating the shaking displacement of the battery cell 2 during vibration, reducing the risk of structural fatigue wear or even direct wear on the surface of the battery cell body 25. At the same time, due to the isolation of the flexible structure 8, the protective cover 4 and the battery cell will not collide, which is beneficial to reducing the risk of damage to the battery cell 2. By gluing both ends of the battery cell 2 to the cell housing 1, the first-order natural frequency of the battery module 10 itself can be effectively increased, and the modal of the entire battery pack 100 is also improved. After the battery pack 100 is mounted on the power equipment 1000, the occurrence of resonance can be reduced in the vibration conditions throughout the service life cycle, ultimately improving the vibration resistance reliability, structural strength and service life of the entire battery pack 100 after being mounted on the power equipment 1000.

[0095] In some embodiments of the present application, as shown in FIG7 , multiple battery modules 10 are arranged in multiple rows and columns, and the battery pack 100 further includes multiple pressure plates 60. The pressure plates 60 are located between the battery modules 10 and the cover plate 50 and are connected to the tray 20. Battery modules 10 in the same row or column are connected to corresponding pressure plates 60. In the specific example of FIG7 , multiple battery modules 10 are arranged in multiple rows and four columns, with four pressure plates 60. Each column of battery modules 10 is connected to a pressure plate 60. In this way, each column of battery modules 10 is firmly connected to each other, making modular installation and disassembly easy.

[0096] Optionally, the pressing plate 60 and the tray 20 may be connected and fixed by fasteners such as bolts and rivets, and the battery module 10 and the corresponding pressing plate 60 may also be connected and fixed by fasteners such as bolts and rivets.

[0097] In some embodiments of the present application, as shown in Figure 7, the battery pack 100 also includes an electrical component 70, which is installed on the tray 20, and the electrical component 70 is located at one end of the battery module 10 in the first direction (F1 / F2), and the other end of the battery module 10 in the first direction (F1 / F2) and both sides of the battery module 10 in the third direction (F5 / F6) are provided with a side insulation layer 802 and an insulating bracket 801, and the battery module 10 is provided with an end insulation layer 803 at both ends in the first direction (F1 / F2), the side insulation layer 802, the insulating bracket 801 and the end insulation layer 803 are all located in the installation cavity 90, and a top insulation layer 804 is provided between the cover plate 50 and the battery module 10. By providing a side insulation layer 802, an end insulation layer 803 and a top insulation layer 804, the two ends, both sides and top of the battery module 10 can be insulated, reducing the heat radiated outward by the battery module 10 during operation, thereby reducing the interference and impact of the heat of the battery module 10 on the surrounding components of the battery pack 100. Specifically, the side insulation layer 802, the end insulation layer 803 and the top insulation layer 804 are insulation cotton. By providing an insulating bracket 801, physical isolation can be achieved between the other end of the battery module 10 in the first direction (F1 / F2) and the two sides of the battery module 10 in the third direction (F5 / F6) and the battery cell shell 1, which is beneficial to improving the safety performance of the battery pack 100. Specifically, the insulating bracket 801 is a plastic bracket, which is light in weight and low in cost.

[0098] Optionally, the cover plate 50 may be a steel cover plate, and a sealing ring is provided at the connection between the cover plate 50 and the tray 20 to seal the installation cavity 90 .

[0099] The acquisition line 53 of the battery module 10 is connected to the electrical component 70, and the battery cell 2 information collected through the acquisition line 53 can be aggregated to the electrical component 70. Optionally, the electrical component 70 may include a distribution box, a controller, high and low voltage connectors, etc.

[0100] 8 , a power device 1000 according to another embodiment of the present application includes the battery pack 100 of the above embodiment.

[0101] 7 , a lifting lug 201 may be provided on the outside of the tray 20 , and the battery pack 100 may be installed on the main body of the power device 1000 by passing a bolt through the lifting lug 201 and then fastening it to the main body of the power device 1000 .

[0102] In some embodiments, after the battery pack 100 is installed on the power equipment 1000 , the first plate 11 is located above the second plate 12 , and the top and bottom of the battery cell 2 are both glued and fixed to the battery cell housing 1 .

[0103] Optionally, the power equipment 1000 is a vehicle, a machine tool, a household appliance, etc.

[0104] According to the power equipment 1000 of the embodiment of the present application, by providing a flexible structure 8 between the protective cover 4 and the cell body 25 of the battery cell 2 separated by the protective cover 4, a flexible constraint can be added to the protective cover 4 and the cell body 25 separated by the protective cover 4, thereby reducing or eliminating the shaking displacement of the battery cell 2 during vibration, reducing the risk of structural fatigue wear or even direct wear on the surface of the battery cell body 25. At the same time, the protective cover 4 and the battery cell will not collide due to the isolation of the flexible structure 8, which is beneficial to reducing the risk of damage to the battery cell 2. By gluing both ends of the battery cell 2 to the cell housing 1, the first-order natural frequency of the battery module 10 itself can be effectively increased, and the modal of the entire battery pack 100 is improved accordingly. After the battery pack 100 is mounted on the power equipment 1000, the occurrence of resonance can be reduced in the vibration conditions throughout the service life cycle, ultimately improving the vibration resistance reliability, structural strength and service life of the entire battery pack 100 after being mounted on the power equipment 1000.

[0105] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0106] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery module (10), wherein: include: A battery cell shell (1), wherein a receiving cavity (15) is formed in the battery cell shell (1); A plurality of battery cells (2), wherein the plurality of battery cells (2) are installed in the accommodating cavity (15), at least one end of the battery cell (2) is fixedly connected to the battery cell shell (1), each of the battery cells (2) comprises a battery cell body (25), a first pole ear (26) and a second pole ear (27), the first pole ear (26) and the second pole ear (27) are both connected to the battery cell body (25), the first pole ear (26) of one of the two adjacent battery cells (2) is connected to the second pole ear (27) of the other battery cell (2), and the battery cell bodies (25) of the two adjacent battery cells (2) are separated by a protective cover (4); and A flexible structure (8), wherein the flexible structure (8) is arranged between the protective cover (4) and a battery body (25) of the battery cell (2) separated by the protective cover (4), and the flexible structure (8) is suitable for abutting against the protective cover (4) and the battery body (25) separated by the protective cover (4).

2. The battery module (10) according to claim 1, wherein: The flexible structure (8) is adhered to the protective cover (4) and / or the battery cell body (25) separated by the protective cover (4).

3. The battery module (10) according to claim 1 or 2, wherein: The battery cell body (25) comprises: The core; and A plastic film (251), the plastic film (251) comprising a plastic film body (2511) and a plastic film extension section (2512), the plastic film body (2511) covers the pole core, the plastic film extension section (2512) is connected to the plastic film body (2511), and the first pole ear (26) and the second pole ear (27) are suitable for being connected to the plastic film extension section (2512), and the flexible structure (8) is suitable for stopping the protective cover (4) and the plastic film body (2511) separated by the protective cover (4).

4. The battery module (10) according to claim 3, wherein: The flexible structure (8) is adhered to the overmolding film extension section (2512).

5. The battery module (10) according to any one of claims 1 to 4, wherein: The flexible structure (8) is a combination of one or more of a foam structure, a rubber structure, and a silicone structure.

6. The battery module (10) according to any one of claims 1 to 5, wherein: The battery cell housing (1) comprises a first plate (11) and a second plate (12) which are arranged opposite to each other, the first plate (11) is provided with a first glue injection hole (111), the second plate (12) is provided with a second glue injection hole (121), and both the first glue injection hole (111) and the second glue injection hole (121) are in communication with the accommodating cavity (15); A first glue filling area is formed between one end of the battery core (2) and the first plate (11), the first glue filling area is connected to the first glue filling hole (111), and a second glue filling hole is formed between the other end of the battery core (2) and the second plate (12). The second glue filling area is connected to the second glue filling hole (121).

7. The battery module (10) according to claim 6, wherein: The first plate (11) is provided with a first glue pouring observation hole (112), and the first glue pouring observation hole (112) is connected to the first glue pouring area; and / or, The second plate (12) is provided with a second glue pouring observation hole (122), and the second glue pouring observation hole (122) is communicated with the second glue pouring area.

8. The battery module (10) according to claim 7, wherein: The first glue pouring hole (111), the second glue pouring hole (121), the first glue pouring observation hole (112) and the second glue pouring observation hole (122) are all provided with sealing pieces (3), and the sealing pieces (3) are used to seal the corresponding holes.

9. The battery module (10) according to any one of claims 6 to 8, wherein: The plurality of battery cells (2) are divided into a plurality of battery cell groups, the plurality of battery cell groups are arranged in sequence along a first direction, two adjacent battery cell groups are separated by corresponding protective covers (4), and the flexible structure (8) is provided between the protective cover (4) and the battery cell groups separated by the protective cover (4).

10. The battery module (10) according to claim 9, wherein: Each of the battery core groups is aligned with at least one of the first glue injection holes (111) and at least one of the second glue injection holes (121).

11. The battery module (10) according to claim 9 or 10, wherein: The first plate (11) is located in a second direction of the second plate (12); in a third direction, the plurality of battery cells (2) are divided into a plurality of rows; two adjacent rows of battery cells (2) are separated by a partition (51); each row of battery cells (2) is aligned with at least one of the first glue injection holes (111) and at least one of the second glue injection holes (121); wherein the first direction, the second direction, and the third direction are perpendicular to each other.

12. The battery module (10) according to claim 7 or 8, wherein: The battery module (10) further comprises a die-cut protective film (52), the die-cut protective film (52) being located in the accommodating cavity (15) and covering the battery cell (2), the die-cut protective film (52) being provided with an avoidance notch (521), and the projections of the first glue filling hole (111), the second glue filling hole (121), the first glue filling observation hole (112) and the second glue filling observation hole (122) on the die-cut protective film (52) being located in the corresponding avoidance notch (521).

13. The battery module (10) according to any one of claims 1 to 12, wherein: The battery module (10) further comprises a protective sheet, which is attached to the corner structure of the outer surface of the battery cell (2), wherein the corner structure comprises an edge formed by the intersection of two non-coplanar planes and / or a sharp corner formed by the intersection of three non-coplanar planes.

14. The battery module (10) according to any one of claims 1 to 13, wherein: The battery module (10) further comprises a collection line (53), the collection line (53) at least partially extending into the accommodating cavity (15), and the battery cell (2) is connected to the collection line (53).

15. A battery pack (100), wherein: include: Tray (20); A heat exchange plate (30), the heat exchange plate (30) being mounted on the tray (20), the heat exchange plate (30) having a heat exchange channel therein, and a mounting cavity (90) being formed above the heat exchange plate (30); A bottom guard plate (40), the bottom guard plate (40) being located below the heat exchange plate (30), and the bottom guard plate (40) being mounted on the tray (20); A battery module (10) according to any one of claims 1 to 14, wherein the battery module (10) is located in the mounting cavity (90), the battery module (10) is in direct contact with the heat exchange plate (30), or a heat conduction structure is provided between the battery module (10) and the heat exchange plate (30); A cover plate (50) is installed on the tray (20), and the battery module (10) is located between the heat exchange plate (30) and the cover plate (50).

16. The battery pack (100) according to claim 15, wherein: The plurality of battery modules (10) are arranged in a plurality of rows and columns. The battery pack (100) further comprises a plurality of pressure plates (60). The pressure plates (60) are located between the battery modules (10) and the cover plate (50). The pressure plates (60) are connected to the tray (20). The battery modules (10) in the same row or column are connected to the corresponding pressure plates (60).

17. The battery pack (100) according to claim 15 or 16, wherein: The battery pack (100) further comprises an electrical component (70), wherein the electrical component (70) is mounted on the tray (20) and is located at one end of the battery module (10) in a first direction, the other end of the battery module (10) in the first direction and both sides of the battery module (10) in a third direction are provided with a side insulation layer (802) and an insulation bracket (801), the two ends of the battery module (10) in the first direction are provided with an end insulation layer (803), the side insulation layer (802), the insulation bracket (801) and the end insulation layer (803) are all located in the mounting cavity (90), and a top insulation layer (804) is provided between the cover plate (50) and the battery module (10).

18. A power device (1000), wherein: A battery pack (100) comprising any one of claims 15 to 17.

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