Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack comprises a lower box body, a plurality of battery modules, a BMS (Battery Management System) slave plate and a module pressing plate, longitudinal beams and cross beams are arranged in the lower box body in a crossed manner, so that a plurality of mounting areas are formed in the lower box body; the battery modules are positioned in the corresponding mounting areas; the BMS slave plate is electrically connected with the battery module; the module pressing plate is located above the battery module, the module pressing plate comprises a plurality of pressing plates and a plurality of connecting plates, the plurality of pressing plates are arranged at intervals along a first direction, the plurality of connecting plates are connected between two adjacent pressing plates and are arranged at intervals along a second direction, and a maintenance space is formed between two adjacent pressing plates and two adjacent connecting plates; and the maintenance space is opposite to the BMS slave plate. According to the battery pack disclosed by the utility model, the two adjacent pressing plates are connected through the connecting plate, so that the risk that the battery module and the liquid cooling plate crack in the vibration process of the battery pack is reduced, and meanwhile, an overhaul space is provided for the maintenance of the BMS slave plate.

Description

Technical Field

[0001] This utility model relates to the field of household battery technology, and in particular to a battery pack and power-consuming device. Background Technology

[0002] In related technologies, a Battery Management System (BMS) is an electronic system used to manage and monitor battery packs. A BMS consists of a main board and slave boards. The main board is responsible for data processing, strategy formulation, and overall control, while the slave boards collect battery parameters and send them to the main board. Integrating the slave boards and battery modules can further improve the volume utilization of the battery pack. However, considering repairability, the module pressure plate is designed as a separate component to provide space for the maintenance of the BMS slave boards. But this separate design results in the first-order dominant frequency of the structural modes not meeting design requirements, and both the cells and the cold plate are at risk of cracking under vibration conditions. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery pack that connects two adjacent pressure plates via a connecting plate. This not only reduces the risk of cracking of the battery module and liquid cooling plate during vibration, but also improves the modal characteristics of the battery pack, while providing maintenance space for BMS slave board repair.

[0004] This utility model also proposes an electrical device having the above-mentioned battery pack.

[0005] A battery pack according to a first aspect of the present invention includes: a lower housing having intersecting longitudinal beams and transverse beams to form multiple mounting areas within the lower housing; multiple battery modules located within corresponding mounting areas; a BMS slave plate electrically connected to the battery modules and located between two adjacent battery modules along a first direction; and a module pressure plate located above the battery modules, the module pressure plate including multiple pressure plates and multiple connecting plates, the multiple pressure plates being spaced apart along the first direction, the multiple connecting plates being connected between adjacent pressure plates and spaced apart along a second direction, a maintenance space being formed between adjacent pressure plates and adjacent connecting plates, the maintenance space being disposed opposite to the BMS slave plate, the first direction being perpendicular to the second direction.

[0006] According to the battery pack of this utility model embodiment, the module pressure plate includes multiple pressure plates and multiple connecting plates. The multiple connecting plates are all connected between two adjacent pressure plates, and a maintenance space is formed between two adjacent pressure plates and two adjacent connecting plates. The BMS slave board is arranged opposite to the maintenance space. By connecting two adjacent pressure plates through the connecting plates, the risk of cracking of the battery module and liquid cooling plate during vibration of the battery pack can be reduced, the modal characteristics of the battery pack can be improved, and maintenance space is also provided for the maintenance of the BMS slave board.

[0007] According to some embodiments of the present invention, two connecting plates are connected between the two pressure plates, and the two connecting plates are respectively located at both ends of the pressure plates along the second direction.

[0008] According to some embodiments of the present invention, the pressure plate and the connecting plate are coplanar on one side along the second direction; and / or, the pressure plate and the connecting plate are coplanar on the other side along the second direction.

[0009] According to some embodiments of the present invention, the battery module includes a plurality of battery cells stacked sequentially along the second direction, the dimension of the battery cell along the first direction is L1, and the dimension of the pressure plate along the first direction is D1, satisfying: L1-25mm≤D1≤L1-15 mm.

[0010] According to some embodiments of this utility model, the dimension of the battery module along the second direction is L2, and the dimension of the connecting plate along the second direction is D2, satisfying: D2≥0.07*L2.

[0011] According to some embodiments of the present invention, the dimension of the connecting plate along the first direction is L3, which satisfies: L3≤3D2.

[0012] According to some embodiments of the present invention, the module pressure plate is provided in multiple ways, and the multiple module pressure plates are arranged along the second direction. The module pressure plate also includes a first fixing plate and a second fixing plate connected to both sides of the pressure plate along the second direction. The first fixing plate and the second fixing plate are both fixedly connected to the crossbeam.

[0013] According to some embodiments of the present invention, the first fixing plate and the second fixing plate, which are adjacent along the second direction, are stacked in the vertical direction.

[0014] According to some embodiments of this utility model, the module pressure plate is an integrally formed part.

[0015] An electrical device according to a second aspect of the present invention includes a battery pack according to the first aspect of the present invention described above.

[0016] According to the embodiment of the present utility model, by setting the above-mentioned battery pack and setting the module pressure plate as an integral molded part, it can not only reduce the risk of battery module and liquid cooling plate cracking during vibration, but also improve the mode of battery pack, and at the same time provide maintenance space for BMS slave board maintenance.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a battery pack according to some embodiments of the present invention;

[0020] Figure 2 yes Figure 1 Top view of the battery pack;

[0021] Figure 3 yes Figure 1 A schematic diagram of the middle module pressure plate.

[0022] Figure label:

[0023] 100. Battery pack;

[0024] 10. Lower box body; 11. Longitudinal beam; 12. Cross beam;

[0025] 21. Battery module; 22. BMS slave board;

[0026] 30. Module pressure plate; 31. Pressure plate; 32. Connecting plate; 33. Maintenance space; 34. First fixing plate; 341. First connecting hole; 35. Second fixing plate; 351. Third connecting hole. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The following is for reference. Figures 1-3 A battery pack 100 according to an embodiment of the present utility model is described.

[0031] According to a first aspect embodiment of the present invention, a battery pack 100 includes a lower housing 10 and a plurality of battery modules 21. A receiving cavity is formed within the lower housing 10, and longitudinal beams 11 and transverse beams 12 are arranged within the receiving cavity. The longitudinal beams 11 and transverse beams 12 intersect to form a plurality of mounting areas within the receiving cavity, and the battery modules 21 are located in corresponding mounting areas. A liquid cooling plate is provided at the bottom of the receiving cavity, and the battery modules 21 can be fixed to the liquid cooling plate using adhesive. For example, a longitudinal beam 11 and a plurality of transverse beams 12 are arranged within the receiving cavity, and the transverse beams 12 are arranged along a first direction (see attached diagram). Figure 3 As shown in direction e1, the first direction can be the width direction of the battery pack 100, extending along the second direction (refer to the appendix). Figure 3 As shown in direction e2 (the second direction can be the length direction of the battery pack 100), the longitudinal beam 11 intersects perpendicularly with multiple crossbeams 12; there are three crossbeams 12, of which two crossbeams 12 are located at the two ends of the receiving cavity along the second direction, and the other crossbeam 12 is located in the middle of the receiving cavity along the second direction, and the longitudinal beam 11 is located in the middle of the receiving cavity along the first direction, which is used to divide the receiving cavity into four installation areas, that is, four battery modules 21 are provided in the battery pack 100.

[0032] The battery pack 100 also includes a BMS slave board 22, which is electrically connected to the battery module 21. The BMS slave board 22 is used to collect parameters of the battery module 21 and send them to the BMS main board. The BMS slave board 22 is located between two adjacent battery modules 21 along the first direction. During the later use of the battery pack 100, the BMS slave board 22 needs to be maintained. Therefore, non-removable parts should not be installed on top of the BMS slave board 22.

[0033] The battery pack 100 also includes a module pressure plate 30, which is located above the battery module 21 and is used to fix the battery module 21 into the lower housing 10. The module pressure plate 30 can be detachably connected to the crossbeam 12 and / or the longitudinal beam 11. The module pressure plate 30 includes multiple pressure plates 31 and multiple connecting plates 32. The multiple pressure plates 31 are arranged at intervals along a first direction, and the multiple connecting plates 32 are connected between two adjacent pressure plates 31. The multiple connecting plates 32 are arranged at intervals along a second direction. Connecting the multiple pressure plates 31 in sequence can better fix the battery module 21 into the lower housing 10, reducing the risk of cracking of the battery module 21 and the liquid cooling plate during vibration. Furthermore, modal and vibration simulation tests show that the modal characteristics of the battery pack 100 are also improved, with an increase of approximately 23 Hz. A maintenance space 33 is formed between two adjacent pressure plates 31 and two adjacent connecting plates 32. The BMS slave plate 22 is arranged opposite to the maintenance space 33, so that the BMS slave plate 22 can be maintained through the maintenance space 33. The first direction is perpendicular to the second direction.

[0034] According to the embodiment of the present invention, the battery pack 100 module pressure plate 30 includes multiple pressure plates 31 and multiple connecting plates 32. The multiple connecting plates 32 are all connected between two adjacent pressure plates 31. A maintenance space 33 is formed between two adjacent pressure plates 31 and two adjacent connecting plates 32. The BMS slave plate 22 is arranged opposite to the maintenance space 33. The connection between the two adjacent pressure plates 31 by the connecting plates 32 can not only reduce the risk of cracking of the battery module 21 and liquid cooling plate during vibration of the battery pack 100, but also improve the mode of the battery pack 100. At the same time, it also provides a maintenance space 33 for the maintenance of the BMS slave plate 22.

[0035] According to some embodiments of this utility model, refer to Figures 2-3 Two connecting plates 32 are connected between the two pressure plates 31. The two connecting plates 32 are located at both ends of the pressure plates 31 along the second direction. In addition to increasing the connection strength of the two pressure plate 31 brackets, the two connecting plates 32 can also reserve sufficient maintenance space 33 for the maintenance of the BMS from the plate 22.

[0036] According to some embodiments of this utility model, refer to Figures 2-3 The pressure plate 31 and the connecting plate 32 are coplanar on one side along the second direction; or the pressure plate 31 and the connecting plate 32 are coplanar on the other side along the second direction; or the pressure plate 31 and one of the connecting plates 32 are coplanar on one side along the second direction, and the pressure plate 31 and the other connecting plate 32 are coplanar on the other side along the second direction. This can prevent the connecting plate 32 from extending out in the second direction and prevent the connecting plate 32 from interfering with other parts.

[0037] According to some embodiments of this utility model, refer to Figures 2-3 The battery module 21 includes multiple battery cells stacked sequentially along the second direction. The dimension of the battery cell along the first direction is L1, and the dimension of the pressure plate 31 along the first direction is D1, satisfying: L1-25mm≤D1≤L1-15mm. The battery cells have battery cover plates on both sides along the first direction, and explosion-proof valves are provided on the battery cover plates. In the first direction, there is a certain distance between the pressure plate 31 and the two side edges of the battery cells to avoid the cell cover plates and explosion-proof valves being subjected to the clamping force of the pressure plate 31.

[0038] For example, the dimension L1 of the battery cell along the first direction can be between 350mm and 450mm. When the dimension L1 of the battery cell along the first direction is 350mm, the dimension D1 of the pressure plate 31 along the first direction can be between 325mm and 335mm. When the dimension L1 of the battery cell along the first direction is 450mm, the dimension D1 of the pressure plate 31 along the first direction can be between 425mm and 435mm. Specifically, the dimension D1 of the pressure plate 31 along the first direction can be 325mm, 335mm, 350mm, 400mm, 425mm, or 435mm, etc.

[0039] According to some embodiments of this utility model, refer to Figures 2-3 The dimension of the battery module 21 along the second direction is L2, and the dimension of the connecting plate 32 along the second direction is D2. The condition is satisfied that D2≥0.07*L2, which can prevent the dimension of the connecting plate 32 in the second direction from being too narrow, thus making the connection between the two adjacent pressure plates 31 too weak. Satisfying the above range can increase the connection strength between the two pressure plates 31, thereby increasing the structural strength of the module pressure plate 30.

[0040] For example, the dimension L2 of the battery module 21 along the second direction can be 500mm, and the dimension D2 of the connecting plate 32 along the second direction can be 35mm, 40mm, 50mm or 55mm, etc.

[0041] According to some embodiments of this utility model, refer to Figures 1-2The dimension of the connecting plate 32 along the first direction is L3, satisfying: L3≤3D2. By limiting the dimension of the connecting plate 32 along the second direction, the dimension of the connecting plate 32 along the first direction can be prevented from being too long, thus avoiding a weak connection between the two pressure plates 31. For example, the dimension D2 of the connecting plate 32 along the second direction can be 35mm, 40mm, 50mm, or 55mm, etc., and the dimension L3 of the connecting plate 32 along the first direction can be 110mm, 120mm, 140mm, or 160mm, etc.

[0042] According to some embodiments of this utility model, refer to Figures 1-3 Multiple module pressure plates 30 are provided, arranged along the second direction. The pressure plate 31 of each module pressure plate 30 is positioned opposite to the corresponding battery module 21. By providing multiple module pressure plates 30, the module pressure plates 30 can absorb assembly errors of the battery module 21 in the second direction. The module pressure plate 30 also includes a first fixing plate 34 and a second fixing plate 35 connected to both sides of the pressure plate 31 along the second direction. Both the first fixing plate 34 and the second fixing plate 35 are fixedly connected to the crossbeam 12. By fixing the first fixing plate 34 and the second fixing plate 35 to the crossbeam 12, the connection strength between the module pressure plate 30 and the crossbeam 12 can be increased.

[0043] For example, the first fixing plate 34 is provided with a plurality of first connecting holes 341, and the crossbeam 12 opposite to the first connecting holes 341 is provided with a plurality of second connecting holes. Fasteners are inserted through the first connecting holes 341 and the second connecting holes. The second fixing plate 35 is provided with a plurality of third connecting holes 351, and the crossbeam 12 opposite to the third connecting holes 351 is provided with a plurality of fourth connecting holes. Fasteners are inserted through the third connecting holes 351 and the fourth connecting holes to fix the module pressure plate 30 to the crossbeam 12.

[0044] According to some embodiments of this utility model, refer to Figures 1-3 The first fixing plate 34 and the second fixing plate 35, which are adjacent to each other along the second direction, are stacked in the vertical direction. The second fixing plate 35 of one module pressure plate 30 can be stacked with the first fixing plate 34 of another adjacent module pressure plate 30 in the vertical direction, which can reduce the space occupied by the first fixing plate 34 and the second fixing plate 35 on the crossbeam 12.

[0045] For example, the third connecting hole 351 of the second fixing plate 35 can be arranged opposite to the first connecting hole 341 of the first fixing plate 34.

[0046] According to some embodiments of this utility model, refer to Figures 1-3The module pressure plate 30 is a one-piece molded part, which makes the processing of the module pressure plate 30 simple and easy; and the one-piece molded module pressure plate 30 has no splicing gaps or connecting parts, which allows the module pressure plate 30 to distribute stress more evenly and avoid local damage due to weak connecting parts.

[0047] An electrical device according to a second aspect of the present invention includes a battery pack 100 according to the first aspect of the present invention described above.

[0048] According to the embodiment of the present utility model, by setting the battery pack 100 and setting the module pressure plate 30 as an integral molded part, not only can the risk of the battery module 21 and the liquid cooling plate cracking during the vibration of the battery pack 100 be reduced, but the modal characteristics of the battery pack 100 can also be improved. At the same time, it also provides maintenance space 33 for the maintenance of the BMS slave board 22.

[0049] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The lower housing has intersecting longitudinal beams and transverse beams, so that multiple installation areas are formed within the lower housing. Multiple battery modules, each located within a corresponding mounting area; BMS slave board, the BMS slave board is electrically connected to the battery module and is located between two adjacent battery modules along the first direction; A module pressure plate is located above the battery module. The module pressure plate includes multiple pressure plates and multiple connecting plates. The multiple pressure plates are arranged at intervals along a first direction. The multiple connecting plates are connected between two adjacent pressure plates and arranged at intervals along a second direction. A maintenance space is formed between two adjacent pressure plates and two adjacent connecting plates. The maintenance space is disposed opposite to the BMS slave board. The first direction is perpendicular to the second direction.

2. The battery pack according to claim 1, characterized in that, Two connecting plates are connected between the two pressure plates, and the two connecting plates are respectively located at both ends of the pressure plates along the second direction.

3. The battery pack according to claim 2, characterized in that, The pressure plate and the connecting plate are coplanar on one side along the second direction; and / or, the pressure plate and the connecting plate are coplanar on the other side along the second direction.

4. The battery pack according to claim 1, characterized in that, The battery module includes multiple battery cells stacked sequentially along the second direction. The dimension of the battery cell along the first direction is L1, and the dimension of the pressure plate along the first direction is D1, satisfying: L1-25mm≤D1≤L1-15 mm.

5. The battery pack according to claim 1, characterized in that, The dimension of the battery module along the second direction is L2, and the dimension of the connecting plate along the second direction is D2, satisfying: D2≥0.07*L2.

6. The battery pack according to claim 5, characterized in that, The dimension of the connecting plate along the first direction is L3, which satisfies: L3≤3D2.

7. The battery pack according to claim 1, characterized in that, The module pressure plate is provided in multiple ways, and the multiple module pressure plates are arranged along the second direction. The module pressure plate also includes a first fixing plate and a second fixing plate connected to both sides of the pressure plate along the second direction. The first fixing plate and the second fixing plate are both fixedly connected to the crossbeam.

8. The battery pack according to claim 7, characterized in that, The first fixing plate and the second fixing plate, which are adjacent to each other along the second direction, are stacked vertically.

9. The battery pack according to claim 1, characterized in that, The module pressure plate is a one-piece molded part.

10. An electrical device, characterized in that, include: The battery pack according to any one of claims 1-9.

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