Power battery device

Abstract

The utility model belongs to power battery technical field discloses a kind of power battery devices.The device includes high-pressure box and at least one battery unit, battery unit includes at least two battery packs arranged along preset first direction, each battery pack includes at least two battery modules arranged along preset second direction, at least two battery modules in each battery pack are connected with first conductive structural member in series, at least two battery packs in each battery unit are connected with second conductive structural member in series, and the total positive output and total negative output of battery unit are connected with third conductive structural member in series between high-pressure box.The device not only can reduce the difficulty of wiring, wiring and wiring in the case of many battery modules and battery packs, improve wiring efficiency, reduce assembly cost, but also be conducive to the monitoring and control of high-pressure box to specific battery module or specific battery pack, to improve the reliability and safety of power battery device.

Description

Technical Field

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

[0002] In the power battery devices of commercial vehicles, the high-voltage distribution unit (usually called the high-voltage box) serves as the core hub for energy distribution and management. It needs to communicate and control signals with the battery management system (BMS) located in the battery boxes on lower levels via a complex network of low-voltage wiring harnesses. Unlike passenger vehicles, commercial vehicles, due to their massive energy demands, typically employ a multi-layered stacked design for their battery systems, resulting in a large number of battery boxes. Current technologies connect multiple battery boxes in series, and then connect the total positive and negative terminals of this series connection to the total positive input and output of the high-voltage box. However, this connection method leads to a complex connection structure and makes wiring and cable management more difficult.

[0003] Therefore, there is an urgent need for a power battery device to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to provide a power battery device that has a multi-layer battery box to meet the large capacity requirements of commercial vehicles, and can also facilitate the connection between the battery box and the high-voltage box.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The power battery device includes:

[0007] High-voltage box;

[0008] At least one battery cell, the battery cell comprising at least two battery packs arranged along a preset first direction, each battery pack comprising at least two battery modules arranged along a preset second direction, at least two battery modules in each battery pack being connected in series with a first conductive structure, at least two battery packs in each battery cell being connected in series with a second conductive structure, and the total positive output and total negative output of the battery cell being connected in series with a third conductive structure corresponding to the high voltage box, the preset first direction and the preset second direction being perpendicular to each other.

[0009] The above-mentioned technical solution has the following advantages or beneficial effects: by grouping battery modules into series to form battery packs, then grouping battery packs into series to form battery cells, and finally electrically connecting the battery cells and the high-voltage box, it can not only reduce the difficulty of wiring, routing and management when there are many battery modules and battery packs, improve wiring efficiency and reduce assembly costs, but also facilitate the monitoring and control of specific battery modules or specific battery packs by the high-voltage box, thereby improving the reliability and safety of the power battery device. Attached Figure Description

[0010] Figure 1 This is a partial three-dimensional view of the power battery device in an embodiment of this utility model;

[0011] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0012] Figure 3 This is a partial front view of the power battery device in an embodiment of this utility model;

[0013] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0014] Figure 5 yes Figure 3 A magnified view of a section at point C.

[0015] In the picture:

[0016] 1. High-voltage box;

[0017] 2. Battery unit; 21. Battery pack; 22. MSD; 221. Disconnect handle; 211. Battery module;

[0018] 31. First conductive structural component; 32. Second conductive structural component; 33. Third conductive structural component; 331. First straight segment; 332. Second straight segment; 333. Turning connection segment;

[0019] 41. Fixed structure; 411. Threaded hole. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" 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 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 based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0024] The following is based on the appendix Figure 1 To be continued Figure 5 This invention introduces the power battery device provided in this utility model.

[0025] Specifically, a power battery device refers to an integrated electrochemical energy storage and management system. Its core function is to receive and store externally input electrical energy and controllably release DC power to supply the drive motor controller and vehicle auxiliary systems during vehicle operation. A power battery device generally includes multiple components or systems such as a device housing, battery box, high-voltage box 1, BMS (Battery Management System), and electrical connection components. The device housing is used to house, fix, or protect the remaining structures. The battery box includes a battery housing and battery modules 211 fixed within it. The battery housing houses, fixes, and protects the battery modules 211, which consist of multiple rechargeable and rechargeable individual cells (e.g., lithium-ion batteries, solid-state batteries, lithium iron phosphate batteries, etc.) arranged in an array. These individual cells are connected and combined using specific electrical connections to form a collection of energy storage units, constituting the electrochemical energy storage core of the power battery device.

[0026] High-voltage box 1 is used to connect the battery box and high-power loads such as the vehicle's motor controller, enabling power output and providing short-circuit protection. The BMS (Battery Management System) is an electronic control unit and sensor network integrated within or tightly coupled to the device. It is used for real-time detection, evaluation, control, and protection of the battery box. Its functions include collecting key parameters such as voltage, current, and temperature of individual cells / modules; calculating state of charge, state of health, and state of power; preventing abnormal operating conditions such as overcharging, over-discharging, overcurrent, overheating, and short circuits; managing the charge state differences between individual cells; and exchanging data with the vehicle's overall controller. Electrical connection components connect the battery module 211, the battery box, high-voltage box 1, and the BMS, enabling connections between the battery box and high-voltage box 1, the BMS and high-voltage box 1, and the battery box and BMS, etc.

[0027] It should be noted that in some embodiments, at least two battery modules 211 are electrically connected to form a battery pack 21, and at least two battery packs 21 are electrically connected to form a battery cell 2. The total positive output and total negative output of each battery cell 2 are connected to the high-voltage box 1, thereby realizing the electrical connection between the high-voltage box 1 and each battery cell 2. Specifically, in this embodiment, refer to... Figure 1 , Figure 2 As shown, the power battery device includes a high-voltage box 1 and two battery units 2. The high-voltage box 1 and the two battery units 2 are arranged along a preset first direction (as shown by the Z-axis in the figure) and are all fixedly installed in the device housing. Each battery unit 2 includes two battery packs 21, which are also arranged along the preset first direction. Each battery pack 21 has a battery housing (therefore, the battery pack 21 in this embodiment can be compared to the battery housing described above). Two battery modules 211 are fixedly installed in each battery housing. The two battery modules 211 are arranged along a preset second direction (as shown by the X-axis in the figure), and the preset first direction and the preset second direction are perpendicular to each other.

[0028] The electrical connection assembly includes a first conductive structure 31, a second conductive structure 32, and a third conductive structure 33. The first conductive structure 31 connects the battery modules 211 in each battery pack 21, achieving a series connection between the battery modules 211. The second conductive structure 32 connects the battery packs 21 in each battery unit 2, achieving a series connection between the battery packs 21. The third conductive structure 33 connects the high-voltage box 1 and the total positive output of the battery unit 2, and also connects the high-voltage box 1 and the high-voltage box 1 to the total negative output, thereby electrically connecting the battery unit 2 and the high-voltage box 1.

[0029] By grouping battery modules 211 into series to form battery packs 21, then grouping battery packs 21 into series to form battery cells 2, and finally electrically connecting battery cells 2 and high-voltage box 1, not only can the difficulty of wiring, routing and organizing be reduced when there are many battery modules 211 and battery packs 21, thus improving wiring efficiency and reducing assembly costs, but it is also beneficial for high-voltage box 1 to monitor and control specific battery modules 211 or specific battery packs 21, thereby improving the reliability and safety of the power battery device.

[0030] Furthermore, in some embodiments, the preset first direction is the height direction of the power battery device, and the preset second direction is the width direction of the power battery device. Of course, in some other embodiments, the preset first direction can also be the length direction or other directions of the power battery device, and the preset second direction can also be the height direction or other directions of the power battery device, as long as the preset first direction and the preset second direction are set perpendicularly, so that the grouping and arrangement of the battery modules 211 do not interfere with each other, and more battery modules 211 can be arranged in the smallest possible space.

[0031] Optionally, in some embodiments, the first conductive structural component 31, the second conductive structural component 32, and the third conductive structural component 33 are made of aluminum busbars, copper busbars, copper-clad aluminum busbars, etc. These structural components are all sheet metal parts made of metal, which can withstand large currents and voltages, meet the requirements of high current and high voltage connections, and also have high structural strength, so that they can effectively resist vibrations and avoid entanglement during vehicle operation, thus ensuring the reliability of the power battery device.

[0032] Furthermore, to facilitate assembly and maintenance, in some embodiments, along a preset third direction (as shown by the Y-axis in the figure), the total positive output and total negative output of the high-voltage box 1 and each battery cell 2 are located at the same end of the power battery device. This preset third direction is perpendicular to the preset first direction and the preset second direction. For example, the preset third direction is the length direction of the power battery device, and the total positive output and total negative output of the high-voltage box 1 and each battery cell 2 are located at one end of the length direction of the power battery device, so that the third conductive structure is located at one end of the power battery device, thereby facilitating the installation and maintenance of the third conductive structure 33.

[0033] It should be noted that a third conductive structure 33 is connected between the total positive output of each battery cell 2 and the high-voltage box 1, as well as between the total negative output of each battery cell 2 and the high-voltage box 1. Therefore, the power battery device includes at least two third conductive structures 33. Thus, in order to ensure electrical safety, adjacent third conductive structures 33 are spaced apart along the preset first direction and the preset second direction to form a safety distance.

[0034] For example, such as Figure 3 , Figure 4 As shown, the third conductive structural component 33 includes at least one first straight segment 331, at least one second straight segment 332, and at least one turning connection segment 333. The first straight segment 331 extends along a preset first direction, and the second straight segment 332 extends along a preset second direction. The first straight segment 331 is connected to the high-voltage box 1 or the total positive output (total negative output), thereby electrically connecting the high-voltage box 1 and the battery unit 2. Between adjacent third conductive structural components 33, when two first straight segments 331 are adjacent, they are spaced apart along the preset second direction to form a safety distance; similarly, when two second straight segments 332 are adjacent, they are spaced apart along the preset first direction to form a safety distance. When the power battery device includes two or more battery units 2, as the number of third conductive structural components 33 increases, they are also spaced apart along the preset first and preset second directions to maintain electrical safety. For example, in this embodiment, the safety distance is 15mm-25mm. When the safety distance is less than 15mm, it is easy to cause breakdown, resulting in safety risks; while when the safety distance is greater than 25mm, it will require more space inside the power battery device to accommodate the aforementioned conductive structural components, which is not conducive to improving the energy density of the power battery device.

[0035] Of course, in some embodiments, insulating elements can also be provided between adjacent third conductive structural elements 33 to reduce the distance between them, thereby allowing more battery cells 2 to be installed in the power battery device while maintaining electrical safety. Therefore, depending on the insulation capacity and installation position of the insulating elements, the specific value and direction of the safety distance are not limited in this invention, as long as electrical safety can be achieved.

[0036] In some embodiments, such as Figure 3 , Figure 5As shown, each battery cell 2 also includes an MSD 22 (Manual Service Disconnect), which is connected in series with at least two battery packs 21 within the same battery cell 2 via a second conductive structure 32. The MSD 22 has a disconnect handle 221, which can be rotated to switch between a first state and a second state. In the first state, the MSD 22 connects at least two battery packs 21 within the same battery cell 2 in series via the second conductive structure 32. In the second state, the MSD 22 disconnects the electrical connection between at least two battery packs 21 within the same battery cell 2. When maintenance is required, rotating the disconnect handle 221 disconnects the electrical connection between at least two battery packs 21 within the battery cell 2, allowing maintenance personnel to perform maintenance even when the battery packs 21 are de-energized, greatly improving safety and convenience during maintenance.

[0037] Furthermore, a fuse is installed inside the MSD22, and the fuse is connected in series between the battery packs 21. When an excessive current occurs between the battery packs 21, the fuse can melt under the action of current heat effect to cut off the electrical connection between the battery packs 21 in the same battery cell 2, thereby protecting the battery packs 21 and the high-voltage box 1.

[0038] Similarly, to facilitate the arrangement and maintenance of the second conductive structure 32, in some embodiments, both the second conductive structure 32 and MSD22 are disposed at one end of the power battery device along a preset third direction, and preferably at the same end as the third conductive structure 33. Similar to the third conductive structure 33, adjacent second conductive structures 32 are spaced apart in the same direction along preset first and second directions, thereby forming a similar safety distance to ensure the electrical safety and reliability of the power battery device. Of course, if additional insulating components are provided, adjacent second conductive structures 32 can also be fitted together along the preset first or second direction, which is also within the scope of protection of this utility model.

[0039] Furthermore, in some embodiments, along a predetermined second direction, the MSD22 and the second conductive structure 32 of each battery cell 2 are located at one end of the power battery device, while the total positive output, total negative output, and the third conductive structure 33 of each battery cell 2 are located at the other end of the power battery device. This arrangement ensures sufficient safety spacing between the second conductive structure 32 and the third conductive structure 33, thereby preventing erroneous electrical connections between them and facilitating assembly and maintenance processes.

[0040] Furthermore, to avoid mutual interference between the third conductive component 33 and the first conductive component 31, in some embodiments, the first conductive component 31 and the third conductive component 33 are staggered along a predetermined third direction. For example, in some embodiments, the first conductive component 31 is disposed inside the battery box of the battery pack 21, while the third conductive component 33 is disposed outside the battery box. This staggered arrangement further isolates the first conductive component 31 and the third conductive component 33 through the battery box, preventing accidental connection.

[0041] like Figure 4 , Figure 5 As shown, in some embodiments, to effectively secure the second conductive structural member 32 and the third conductive structural member 33, a fixing structure 41 and a limiting member are also provided in the power battery device. The fixing structure 41 can be fixedly connected to the device housing or the battery housing. The limiting member is connected to the fixing structure 41 and can correspondingly connect to the second conductive structural member 32 and the third conductive structural member 33, thereby achieving the effect of fixing the second conductive structural member 32 and the third conductive structural member 33 in a fixed manner.

[0042] For example, the limiting member includes a cable tie (not shown in the figure), and the cable tie is provided with a threaded portion. The fixing structure 41 has a threaded hole 411, through which the threaded portion can be fixedly connected to the fixing structure 41, thereby fixing the second conductive structure 32 and the third conductive structure 33. The cable tie can flexibly limit the second conductive structure 32 and the third conductive structure 33 without affecting the installation. At the same time, the threaded connection also facilitates the disassembly of the second conductive structure 32 and the third conductive structure 33, which can help improve the efficiency of maintenance, repair and replacement.

[0043] Preferably, in some embodiments, the fixing structure 41 includes a connecting ear, which is fixedly connected to the inner wall of the device housing of the power battery device and protrudes towards the battery pack 21. This fixes the second conductive structural member 32 and the third conductive structural member 33 while maintaining a gap between them and the device housing, preventing electrical connection between them. The end of the connecting ear away from the battery pack 21 can be welded to the device housing, or it can be fixed by threaded connection, adhesive connection, or other methods, all of which fall within the scope of protection of this utility model.

[0044] Furthermore, both the fixing structure 41 and the limiting member are preferably made of insulating material, thereby further avoiding the formation of an electrical connection between the second conductive structure 32 or the third conductive structure 33 and the device housing, which could cause safety risks such as short circuits and electric shocks.

[0045] It should be noted that since the first conductive structural member 31 is preferably disposed inside the battery box, the aforementioned fixing structure 41 and limiting member can also be disposed inside the battery box, thereby fixing the first conductive structural member 31 and the battery box together.

[0046] In the description of this specification, references to terms such as "some embodiments," "other embodiments," 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.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A power battery device, characterized in that, include: High-voltage box (1); At least one battery cell (2), the battery cell (2) includes at least two battery packs (21) arranged along a preset first direction, each battery pack (21) includes at least two battery modules (211) arranged along a preset second direction, at least two battery modules (211) in each battery pack (21) are connected in series with a first conductive structure (31), at least two battery packs (21) in each battery cell (2) are connected in series with a second conductive structure (32), the total positive output and total negative output of the battery cell (2) are connected in series with a third conductive structure (33) corresponding to the high voltage box (1), the preset first direction and the preset second direction are perpendicular to each other.

2. The power battery device according to claim 1, characterized in that, Each of the battery cells (2) further includes an MSD (22), which is connected in series with at least two battery packs (21) within the same battery cell (2) via the second conductive structure (32).

3. The power battery device according to claim 2, characterized in that, The MSD (22) is provided with a fuse that can melt to cut off the electrical connection between at least two battery packs (21) within the same battery cell (2).

4. The power battery device according to claim 2, characterized in that, The MSD (22) has a disconnect handle (221) that can rotate to switch the MSD (22) between a first state and a second state. In the first state, the MSD (22) connects at least two battery packs (21) in the same battery cell (2) in series through the second conductive structure (32). In the second state, the MSD (22) disconnects the electrical connection between at least two battery packs (21) in the same battery cell (2).

5. The power battery device according to claim 1, characterized in that, The power battery device further includes a fixing structure (41), wherein the first conductive structural member (31) and / or the second conductive structural member (32) and / or the third conductive structural member (33) are connected to a limiting member, and the limiting member and the fixing structure (41) are connected and arranged.

6. The power battery device according to claim 5, characterized in that, The fixing structure (41) has a threaded hole (411), the limiting member includes a cable tie, and the cable tie is provided with a threaded portion, which can be fixedly connected to the fixing structure (41) through the threaded hole (411).

7. The power battery device according to claim 5, characterized in that, The fixing structure (41) includes a connecting ear, which is fixedly connected to the inner wall of the device housing of the power battery device and protrudes towards the battery pack (21).

8. The power battery device according to claim 5, characterized in that, Both the fixing structure (41) and the limiting member are made of insulating material.

9. The power battery device according to claim 1, characterized in that, The power battery device includes at least two battery cells (2), and the at least two battery cells (2) are arranged along the preset first direction.

10. The power battery device according to claim 2, characterized in that, Along a preset third direction, the total positive output and the total negative output of the high-voltage box (1) and each of the battery cells (2) are located at one end of the power battery device, and the preset third direction is perpendicular to the preset first direction and the preset second direction.

11. The power battery device according to claim 10, characterized in that, Along the preset third direction, the third conductive structural member (33) is located at one end of the power battery device.

12. The power battery device according to claim 11, characterized in that, Along the preset first direction, adjacent third conductive structural members (33) are spaced apart to form a safety distance; and / or, Along the preset second direction, adjacent third conductive structural members (33) are spaced apart to form a safe distance.

13. The power battery device according to claim 11, characterized in that, Along the preset second direction, the MSD (22) and the second conductive structure (32) of each battery cell (2) are located at one end of the power battery device, and the total positive output, the total negative output and the third conductive structure (33) of each battery cell (2) are located at the other end of the power battery device.

14. The power battery device according to claim 13, characterized in that, Along the predetermined first direction, adjacent second conductive structural members (32) are spaced apart to form a safety distance; and / or, Along the preset second direction, adjacent second conductive structural members (32) are spaced apart to form a safe distance.

15. The power battery device according to claim 12 or 14, characterized in that, The size of the safety distance is 15mm-25mm.

16. The power battery device according to claim 11, characterized in that, Along the preset third direction, the second conductive structure (32), the third conductive structure (33), and the MSD (22) are all disposed at one end of the power battery device.

17. The power battery device according to claim 16, characterized in that, Along the preset third direction, the first conductive structure (31) and the third conductive structure (33) are misaligned.

18. The power battery device according to claim 1, characterized in that, The first conductive structural member (31) extends along the preset second direction.

19. The power battery device according to claim 1, characterized in that, The second conductive structure (32) and / or the third conductive structure (33) include at least one first straight segment (331), at least one second straight segment (332), and at least one bend connecting segment (333). The first straight segment (331) extends along the preset first direction, the second straight segment (332) extends along the preset second direction, and the bend connecting segment (333) connects the first straight segment (331) and the second straight segment (332).

20. The power battery device according to claim 1, characterized in that, The first conductive structural component (31) and / or the second conductive structural component (32) and / or the third conductive structural component (33) include aluminum busbars, copper busbars or copper-clad aluminum busbars.

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