Battery pack and power device

Abstract

The utility model discloses a battery pack and a power plant, the battery pack comprises: a box body, in which an accommodating cavity is formed; the battery module is arranged in the accommodating cavity, the battery module comprises a first group, a second group and a third group which are arranged at intervals in the width direction, a first conducting bar is arranged between the first group and the second group, and a second conducting bar is arranged between the second group and the third group. According to the battery pack disclosed by the utility model, the conducting bar is arranged in the gap between the two adjacent battery modules, so that the top of the battery pack is ensured to be a plane, the design of CTC / CTB is supported, the battery cells of the battery modules are all L400 battery cells, the lengths of the battery cells are shortened, the internal resistance is reduced, and the capacity that the average fast charge rate of the battery pack is more than 4C is met; the resistance loss is reduced, and the charging efficiency is improved.

Description

Technical Field

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

[0002] The relevant technologies indicate that the CTB / CTC solution has been gradually promoted and applied due to its advantages such as simplifying vehicle design, improving structural efficiency, reducing the number of parts, saving space, significantly reducing vehicle weight, and increasing battery range. For short-blade batteries, since the cells themselves have good load-bearing capacity, the top cover water-cooling plate / flat top cover can serve as the vehicle floor, which can be well compatible with CTC and CTB designs. Existing blade cells are designed to circumvent the size protection of long blade cells, maximize compatibility with battery packs of different widths, and avoid long copper busbars in the overall pack. As a result, the cell length is usually defined as <600mm. L600 short blade cells can typically only be arranged in two rows in the width direction of the battery pack. However, combined with the current CTC / CTB scheme, the usable width of the battery pack is larger, usually ≥1330mm. Using the two-row layout of L600 cells will provide ample width space within the pack. In current 400V or 800V systems, the cell capacity is usually around 150Ah, and the solutions already in mass production have an average fast charging rate of 4C. However, the current L600 cells can only achieve a maximum average fast charging rate of around 3.5C.

[0003] For a battery pack with a fixed and relatively wide width, the Y-axis space of the battery pack cannot be fully utilized in the design scheme based on L600 cells. Since the internal resistance of the cell is positively correlated with the length of the cell, and the current average fast charging capability of L600 cells is only around 3.5C (capacity around 150Ah), it cannot meet the requirements of the mainstream fast charging rate of ≥4C for high-end products. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery pack with low resistance loss and high charging efficiency.

[0005] This utility model also proposes a power device having the above-mentioned battery pack.

[0006] A battery pack according to a first aspect of the present invention includes: a housing having a receiving cavity formed therein; and a battery module disposed within the receiving cavity. The battery module includes a first group, a second group, and a third group arranged at intervals in the width direction, with a first conductive bar between the first group and the second group, and a second conductive bar between the second group and the third group.

[0007] According to the present invention, the battery pack ensures that the top of the battery pack is flat by placing the conductive busbar in the gap between two adjacent battery modules, thereby supporting the design of CTC / CTB. The battery cells of the battery modules are all L400 cells, which shorten the cell length and reduce the internal resistance, thus meeting the battery pack's ability to achieve an average fast charging rate of 4C or more, reducing resistance loss and improving charging efficiency.

[0008] In some embodiments, the housing has a first mounting area, a second mounting area, and a third mounting area. The first group is located in the first mounting area, the second group is located in the second mounting area, and the third group is located in the third mounting area. The second mounting area forms an assembly area, and a front-drive copper busbar is provided in the assembly area.

[0009] In some embodiments, one end of the second group is provided with a first end plate, and a mounting groove is formed on the first end plate for fixing the front drive copper busbar.

[0010] In some embodiments, the first end plate is provided with a mounting base for fixing the high voltage lead of the battery module.

[0011] In some embodiments, the ends of the first group and the third group are each provided with a second end plate, and the thickness of the first end plate is greater than the thickness of the second end plate.

[0012] In some embodiments, the housing has a crossbeam, and a reinforcing plate is connected between the crossbeam and the first end plate and / or the second end plate.

[0013] In some embodiments, the receiving cavity forms an electrical compartment located at the rear of the receiving cavity. The electrical compartment contains a BMS master-slave board and a high-voltage power distribution box. The BMS master-slave board is connected to the battery module via a wiring harness.

[0014] In some embodiments, the enclosure includes a cover plate and a base, the cover plate is disposed on the base, and an inspection port is formed on the cover plate, the inspection port being disposed corresponding to the electrical compartment.

[0015] In some embodiments, the front of the enclosure is provided with a front drive connector, which is electrically connected to a front drive copper busbar, and the rear of the enclosure is provided with a rear drive connector, a low-voltage connector, and a fast charging connector.

[0016] The power device according to the second aspect of the present invention includes the battery pack according to the first aspect of the present invention.

[0017] According to the power device of this utility model, by setting the battery pack of the first aspect mentioned above, the fast charging capability of the power device is improved and the safety of the power device is guaranteed.

[0018] 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

[0019] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 A schematic diagram of the internal layout of the battery pack shown;

[0021] Figure 3 yes Figure 2 The diagram shows the assembly of the conductive busbars of the battery pack.

[0022] Figure 4 yes Figure 3 The diagram shows an assembly of the battery pack.

[0023] Figure 5 yes Figure 4 The diagram shows an assembly schematic of the battery module.

[0024] Figure 6 yes Figure 5 A schematic diagram of the battery module from another angle;

[0025] Figure 7 yes Figure 6 Another angle of the battery module shown is a schematic diagram;

[0026] Figure 8 This is an assembly diagram of a battery pack according to an embodiment of the present invention;

[0027] Figure 9 This is an assembly diagram of a battery pack according to another embodiment of the present invention.

[0028] Figure label:

[0029] 100. Battery Pack; 1. Housing; 11. Crossbeam; 12. Electrical Compartment; 13. Cover Plate; 131. Inspection Port; 14. Base; 15. Reinforcing Plate; 2. Battery Module; 21. First Group; 22. Second Group; 23. Third Group; 24. First End Plate; 241. Mounting Base; 25. Second End Plate; 3. First Conductor Busbar; 4. Second Conductor Busbar; 5. BMS Master / Slave Board; 6. High Voltage Distribution Box; 7. Rear Drive Connector; 8. Low Voltage Connector; 9. Fast Charging Connector. Detailed Implementation

[0030] 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] The following is for reference. Figures 1-9 A battery pack 100 according to a first aspect embodiment of the present invention is described.

[0032] like Figures 1-9 As shown, the battery pack 100 according to the first aspect of the present invention includes: a housing 1 and a battery module 2.

[0033] Specifically, a receiving cavity is formed inside the housing 1, and the battery module 2 is disposed within the receiving cavity. The battery module 2 includes a first group 21, a second group 22, and a third group 23 arranged at intervals in the width direction. A first conductive bar 3 is provided between the first group 21 and the second group 22, and a second conductive bar 4 is provided between the second group 22 and the third group 23. That is to say, the first conductive bar 3 is disposed between the first group 21 battery module 2 and the second group 22 battery module 2, and the second conductive bar 4 is disposed between the second group 22 battery module 2 and the third group 23 battery module 2, ensuring that the top of the battery pack 100 is flat, supporting the CTC / CTB design, and meeting the charging requirements of an average fast charging rate of ≥4C.

[0034] Understandably, the casing 1, as the outer shell of the entire battery pack 100, not only protects the internal battery modules 2 but also maintains a stable battery operating environment (such as temperature control). The casing 1 is typically made of lightweight, high-strength materials, such as aluminum alloy or composite materials, to ensure sufficient mechanical strength while reducing weight. Each battery module 2 includes multiple cells, and each cell is an L400 cell, thus reducing resistance loss and improving charging efficiency.

[0035] According to the embodiment of the present utility model, the battery pack 100 is designed so that the top of the battery pack 100 is flat by placing the conductive busbar in the gap between two adjacent battery modules 2, thereby supporting the design of CTC / CTB. The battery cells of the battery modules 2 are all L400 cells. The cell length is shortened and the internal resistance is reduced, which meets the requirement of the battery pack 100 having an average fast charging rate of more than 4C, reducing resistance loss and improving charging efficiency.

[0036] In some embodiments of this utility model, the housing 1 has a first mounting area, a second mounting area, and a third mounting area. A first group 21 is disposed in the first mounting area, a second group 22 is disposed in the second mounting area, and a third group 23 is disposed in the third mounting area. The second mounting area forms an assembly area, in which a front-drive copper busbar is disposed. This ensures the stable installation of the front-drive copper busbar, improves the safety of the battery pack 100, and makes the overall shape of the battery pack 100 regular.

[0037] Furthermore, one end of the second group 22 is provided with a first end plate 24, on which a mounting groove is formed for fixing the front drive copper busbar. A mounting seat 241 is provided on the first end plate 24 for fixing the high-voltage lead of the battery module 2. It can be understood that the first end plate 24 is located within the assembly area, and the front drive copper busbar is mounted on the first end plate 24, enhancing the physical structural stability of the battery pack 100 and ensuring the reliability of the electrical connection. The mounting seat 241 is used to fix the output terminal and the conductive busbar, and for the transfer and fixing of the front high-voltage lead of the first group 21 and the third group 23, improving the safety of the battery pack 100.

[0038] It should be noted that when the first group 21 and the third group 23 are even / odd numbered strings, simply adjusting the placement of the module leads and simultaneously adjusting the connecting copper busbars will achieve a high-voltage connection for the entire package. Figure 8 and Figure 9 As shown.

[0039] Furthermore, both the first group 21 and the third group 23 are equipped with a second end plate 25 at their ends. The thickness of the first end plate 24 is greater than that of the second end plate 25. The second end plate 25 is used for heat insulation and insulation with the front side beam. The thickness of the second end plate 25 is about 3mm, and the second end plate 25 is a plastic part. It is understandable that the first end plate 24 is used to connect and fix electrical components, so a thicker end plate is required. The second end plate 25 is only used for heat insulation and insulation, so an end plate of about 3mm is used. This saves internal space and production costs of the housing 1 and reduces the weight of the battery pack 100.

[0040] In some embodiments of the present invention, Figure 2 As shown, the housing 1 has a crossbeam 11, and a reinforcing plate 15 is connected between the crossbeam 11 and the first end plate 24 and / or the second end plate 25. The crossbeam 11 and the reinforcing plate 15 work together to significantly improve the rigidity and deformation resistance of the entire battery pack 100, avoid stress concentration, improve the installation stability of the battery pack 100, extend the service life of the battery pack 100, and ensure the safety of the battery pack 100.

[0041] In some embodiments of the present invention, Figure 1As shown, the housing cavity forms an electrical compartment 12, which is located at the rear of the housing cavity. This allows for better utilization of the space in the housing 1 and ensures that the battery module 2 has sufficient installation space. The electrical compartment 12 houses the BMS master-slave board 5 and the high-voltage distribution box 6. The BMS master-slave board 5 is connected to the battery module 2 via a wiring harness. The BMS and other electrical components generate a certain amount of heat. Placing them in an independent electrical compartment 12 allows for more effective heat dissipation management and maintains the normal operating temperature of these sensitive electronic components.

[0042] Furthermore, such as Figure 1 As shown, the enclosure 1 includes a cover plate 13 and a base 14. The cover plate 13 is placed on the base 14, and an inspection port 131 is formed on the cover plate 13, which is correspondingly arranged with the electrical compartment 12. This facilitates the maintenance of electrical components inside the electrical compartment 12, improves maintenance efficiency, and reduces the difficulty of maintenance.

[0043] In some embodiments of the present invention, Figures 1-4 As shown, the front of the housing 1 is equipped with a front drive connector, which is electrically connected to the front drive copper busbar. The rear of the housing 1 is equipped with a rear drive connector 7, a low-voltage connector 8, and a fast-charging connector 9. This not only improves the functionality and safety of the battery pack 100, but also enhances its reliability and maintainability in practical applications.

[0044] In some embodiments, the cover plate 13 is bonded to the top surface of the battery cell to support CTC / CTB design, and cooling channels are formed inside the cover for cooling the inside of the battery pack 100.

[0045] The power 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.

[0046] According to the power device of the present utility model embodiment, by providing the battery pack 100 of the first aspect embodiment, the fast charging capability of the power device is improved and the safety of the power device is ensured.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation to the present invention.

[0048] 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 technical features indicated. 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.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication 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.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] 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 box has a receiving cavity formed inside it; A battery module is disposed within the receiving cavity. The battery module includes a first group, a second group, and a third group arranged at intervals in the width direction. A first conductive busbar is provided between the first group and the second group, and a second conductive busbar is provided between the second group and the third group.

2. The battery pack according to claim 1, characterized in that, The enclosure has a first installation area, a second installation area and a third installation area. The first group is located in the first installation area, the second group is located in the second installation area, and the third group is located in the third installation area. The second installation area forms an assembly area, and the assembly area is provided with a front-drive copper busbar.

3. The battery pack according to claim 2, characterized in that, The second group has a first end plate at one end, and a mounting groove is formed on the first end plate for fixing the front drive copper busbar.

4. The battery pack according to claim 3, characterized in that, The first end plate is provided with a mounting base for fixing the high voltage lead of the battery module.

5. The battery pack according to claim 4, characterized in that, Both the first group and the third group have a second end plate at their ends, and the thickness of the first end plate is greater than the thickness of the second end plate.

6. The battery pack according to claim 5, characterized in that, The box body has a crossbeam, and a reinforcing plate is connected between the crossbeam and the first end plate and / or the second end plate.

7. The battery pack according to any one of claims 1-6, characterized in that, The cavity contains an electrical compartment located at the rear of the cavity. The electrical compartment contains a BMS master / slave board and a high-voltage power distribution box. The BMS master / slave board is connected to the battery module via a wiring harness.

8. The battery pack according to claim 7, characterized in that, The enclosure includes a cover plate and a base. The cover plate is placed on the base and has an inspection port, which is corresponding to the electrical compartment.

9. The battery pack according to claim 7, characterized in that, The front of the enclosure is provided with a front drive connector, which is electrically connected to the front drive copper busbar. The rear of the enclosure is provided with a rear drive connector, a low-voltage connector, and a fast charging connector.

10. A power unit, characterized in that, The battery pack includes any one of claims 1-9.

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