Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, the battery pack comprises a battery pack shell, a battery module, a BDU, a BMS main board and a BMS slave board, the battery pack shell is internally provided with an accommodating cavity; the battery module is arranged in the accommodating cavity, and a first electrical cabin and a second electrical cabin are respectively formed at two ends of the battery module; the BDU and the BMS mainboard are arranged in the first electrical cabin, and the BDU is electrically connected with the battery module; the BMS slave board is arranged in the accommodating cavity and is in signal conduction with the BMS main board; the battery module comprises a plurality of battery units, the battery units are arranged in a matrix and are connected in series through a busbar, and positive electrodes and negative electrodes of the battery units close to the inner side wall of the battery pack shell are arranged close to the center line of the accommodating cavity. According to the battery pack disclosed by the utility model, through the design and layout of the battery units, the long busbars in the battery rear cabin in the battery pack are reduced or shortened, the manufacturing cost and the failure rate of the battery pack are reduced, and the use cost of the battery pack is reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, in particular to a battery pack and a vehicle. Background Art

[0002] With the increase in the per capita ownership of electric vehicles, people's requirements for electric vehicles are getting higher and higher, especially for the battery pack, which is one of the cores of electric vehicles. People's expectations for the battery pack are mainly reflected in energy density, volume density and battery safety. Therefore, when designing the battery pack, it is necessary to consider battery lightweight, maximize the space utilization rate of the battery pack, and improve the safety and reliability of the battery pack.

[0003] In the prior art, the electrical architecture of the generally available battery packs in the market is CCS (组合充电系统) and the distributed slave boards mostly adopt a wire harness transfer method. Even if there is a CCS direct plug-in slave board or an integrated slave board, due to the different numbers of battery panel strings, there will be an extra high-voltage cross-connect busbar, which increases the design cost and occupies too much space in the electrical compartment of the battery pack. This results in a large volume and heavy weight of the battery pack, a high failure rate during the use of the battery pack, and high costs for battery use, maintenance and repair. Summary of the Utility Model

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, one of the purposes of the present utility model is to provide a battery pack. Through the design and layout of battery cells in this battery pack, the long busbar in the rear battery compartment of the battery pack is reduced or shortened, thereby reducing the manufacturing cost and failure rate of the battery pack and the usage cost of the battery pack.

[0005] In order to overcome at least one of the above-mentioned defects of the prior art, another purpose of the present utility model is to provide a battery pack. By placing the BMS slave board in the second electrical compartment, the utilization rate of the second electrical compartment in the battery pack is achieved, that is, the utilization rate of the overall space in the battery pack is realized, which is beneficial to reducing the volume of the battery pack and achieving the lightweight of the battery pack.

[0006] In order to overcome at least one of the above-mentioned defects of the prior art, the third purpose of the present utility model is to provide a vehicle. The aforementioned battery pack is used in this vehicle, making the overall manufacturing cost of this vehicle low, the total weight reduced, the failure rate during use low, and the usage cost low.

[0007] The technical solution adopted by the present utility model to solve its problems is as follows:

[0008] A battery pack includes a battery pack housing, a battery module, a BDU, a BMS main board and a BMS slave board. The battery pack housing has an accommodation cavity inside; the battery module is placed in the accommodation cavity, and a first electrical compartment and a second electrical compartment are respectively formed at both ends of the battery module;

[0009] Both the BDU and the BMS main board are placed in the first electrical compartment, and the BDU is electrically connected to the battery module; the BMS slave board is placed in the accommodation cavity and is in signal conduction with the BMS main board;

[0010] The battery module includes a plurality of battery cells, and each of the battery cells is arranged in a matrix and connected in series through a bus bar. The positive and negative electrodes of the battery cells close to the inner side wall of the battery pack housing are both arranged close to the center line of the accommodation cavity.

[0011] Further: Each of the battery cells arranged in a matrix is connected in series in sequence.

[0012] Further: The positive or negative electrode of any battery cell is close to the negative or positive electrode of the adjacent battery cell and is electrically connected through the bus bar.

[0013] Further: The bus bar includes a long bus bar and a short bus bar, and the long bus bars are all arranged in the first electrical compartment.

[0014] Further: The BDU is arranged close to the center line of the accommodation cavity, and the positive and negative electrodes of the BDU are respectively arranged close to the positive and negative electrodes of the battery cell electrically connected thereto.

[0015] Further: The BMS main board is placed in the first electrical compartment, the BMS slave board is placed in the second electrical compartment, and the BMS slave board is in signal conduction with the BMS main board through a signal line.

[0016] Further: The BMS slave board is in signal conduction with the BMS main board through a signal line and adopts a daisy chain communication method.

[0017] A battery pack includes a battery pack housing, a battery module, a BDU, a BMS main board, and a BMS slave board. The interior of the battery pack housing has an accommodation cavity; the battery module is arranged in the accommodation cavity, and a first electrical compartment and a second electrical compartment are respectively formed at both ends of the battery module;

[0018] The BMS main board is placed in the first electrical compartment; the BMS slave board is placed in the second electrical compartment, and the BMS slave board is in signal conduction with the BMS main board.

[0019] Further: The BDU is placed in the first electrical compartment, and the BDU is electrically connected to the battery module;

[0020] The battery module includes a plurality of battery cells, and each of the battery cells is arranged in a matrix and connected in series through busbars. The positive and negative electrodes of the battery cells close to the inner sidewall of the battery pack housing are both arranged close to the midline of the accommodating cavity. The busbars include long busbars and short busbars, and the long busbars are all arranged in the first electrical compartment.

[0021] A vehicle includes the aforementioned battery pack.

[0022] In summary, a battery pack provided by the present utility model has the following technical effects:

[0023] 1. The positive and negative electrodes of the battery cells close to the inner sidewall of the battery pack housing are both arranged close to the midline of the accommodating cavity. In this way, the busbars used by adjacent battery cells are shorter, the length of the busbars is shortened, the overall length of the busbars used is shortened, the cost is saved, the failure rate of the busbars is reduced, and the failure rate of the battery pack during use is reduced.

[0024] 2. The long busbars are all arranged in the first electrical compartment. On the one hand, the overall length of the busbars used is shortened. On the other hand, the space of the second electrical compartment is released, which is convenient for the utilization of the electrical compartment space in the battery pack, or reduces the overall volume of the battery pack, realizing the lightweight of the battery pack.

[0025] 3. The BMS slave board is placed in the second electrical compartment, which improves the utilization rate of the battery compartment, especially the utilization of the second electrical compartment. At the same time, there are fewer electrical components in the first electrical compartment, the structure is simple, which is convenient for management and maintenance, and is also conducive to reducing the overall volume of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the internal structure of a battery pack in the prior art.

[0027] Figure 2 It is a schematic structural diagram of an embodiment of a battery pack of the present utility model.

[0028] Figure 3 It is a schematic structural diagram of another embodiment of a battery pack of the present utility model.

[0029] Figure 4 It is a schematic structural diagram of still another embodiment of a battery pack of the present utility model.

[0030] Among them, the meanings of the reference numerals are as follows:

[0031] 1. Battery pack housing; 2. Battery module; 21. Battery cell; 3. BMS main board; 4. BDU; 5. BMS slave board; 6. Busbar; 7. Signal line; 8. First electrical compartment; 9. Second electrical compartment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] See also Figure 1 , discloses a schematic diagram of the structure of an embodiment of the internal structure of a battery pack in the prior art. Figure 1 In the embodiment, the BMS main board 3, the BDU 4 and the BMS slave board 5 are all placed in the first electrical compartment 8. In the prior art, the arrangement of each battery cell 21 of the battery module 2 is roughly as follows: Figure 1 As shown, the positive and negative electrodes of the battery cells 21 close to the inner wall of the battery pack shell are arranged close to the inner wall of the battery pack shell. In this way, when the battery cells 21 are connected in series, more long busbars for connecting adjacent battery cells in series appear in the second electrical compartment. In this way, the overall length of the busbars in the battery pack is longer, which increases the usage of the busbars and increases the cost of the busbars. In addition, the BMS main board 3, BDU 4 and BMS slave board 5 are all placed in the first electrical compartment 8, which makes the first electrical compartment 8 have many components, complex structures and circuits, and prone to failure. At the same time, it also wastes the space of the second electrical compartment 9, which does not meet the requirements and expectations of the existing market for battery packs.

[0036] See also Figures 2 to 4 , respectively disclose three embodiments of the internal structure of a battery pack of the utility model.

[0037] A battery pack includes a battery pack housing 1, a battery module 2, a BDU 4, a BMS main board 3 and a BMS slave board 5. The battery pack housing 1 has a receiving cavity inside; the battery module 2 is arranged in the receiving cavity, and a first electrical compartment 8 and a second electrical compartment 9 are formed at both ends of the battery module 2.

[0038] The BDU4 is placed inside the first electrical compartment 8, and the BDU4 is electrically connected to the battery module 2. The BMS slave board 5 is placed inside the accommodating cavity and is in signal conduction with the BMS main board 3.

[0039] The battery module 2 includes a plurality of battery cells 21. Each battery cell 21 is arranged in a matrix and is connected in series through a bus bar 6. The positive and negative electrodes of the battery cell 21 close to the inner side wall of the battery pack housing 1 are both arranged close to the center line of the accommodating cavity.

[0040] Based on the above technical solution, the battery module 2 is placed inside the accommodating cavity, including that the battery module is fixedly installed inside the battery accommodating cavity or the battery module is detachably and fixedly installed inside the accommodating cavity.

[0041] Based on the above technical solution, generally, each battery cell 21 is formed by a plurality of battery cores, and generally forms a battery cell with a cuboid structure. In order to improve the utilization of the accommodating cavity inside the battery pack housing 1, each battery cell is arranged regularly, preferably in a matrix arrangement. The battery cells arranged in a matrix are connected end to end, which is convenient for connecting adjacent battery cells in series and can shorten the length of the bus bar as much as possible. Here, the so-called "connected end to end" means that the positive electrode of one battery cell is close to the negative electrode of another battery cell, or the negative electrode of one battery cell is close to the positive electrode of another battery cell.

[0042] Based on the above technical solution, as Figure 2 、 Figure 3 and Figure 4 shown, they are all top views of the internal structure of the battery pack. Inside the accommodating cavity, the positive and negative electrodes of the battery cell 21 close to the inner side wall of the battery pack housing 1 are both arranged close to the center line of the accommodating cavity.

[0043] Taking 8 1P12S battery cells as an example:

[0044] 8 1P12S battery cells are arranged in a matrix and installed in the accommodating cavity of the battery pack housing. The positive and negative electrodes of the 4 battery cells close to the inner side wall of the battery pack housing are close to each other, as Figure 2 、 Figure 3 or Figure 4 . And for the 4 battery cells in the middle, there are three setting methods for the positive and negative electrodes:

[0045] As Figure 2 shown, the positive and negative electrodes of 2 of the battery cells are arranged close to the positive and negative electrodes of the battery cell close to the inner side wall of the accommodating cavity connected in series with them, and the positive and negative electrodes of the other 2 battery cells are arranged close to the central axis of the accommodating cavity. In this way, the bus bar (such as Figure 2The medium thick solid lines (the busbars) have different lengths. However, the length of the busbars in the second electrical compartment is shorter than that of the busbars in the second electrical compartment in the prior art. At the same time, a longer busbar will be added in the first electrical compartment. Although the overall length of the busbars has not decreased or the decrease is relatively small, the length of the busbars in the second electrical compartment is shorter than that in the prior art, which releases part of the space in the second electrical compartment and facilitates the utilization of the space in the second electrical compartment.

[0046] As Figure 3 shown in Figure 3 , the positive and negative electrodes of the other 4 battery cells are both arranged close to the central axis of the accommodating cavity. In this way, the busbars (such as

[0047] As Figure 4 shown in Figure 4 , the positive and negative electrodes of the other 4 battery cells are respectively arranged close to the positive and negative electrodes of the battery cells connected in series with them and close to the inner sidewall of the accommodating cavity. In this way, the busbars (such as

[0048] In summary, in the three embodiments of Figure 2 , Figure 3 and Figure 4 , by arranging the positive and negative electrodes of the battery cells close to the inner sidewall of the battery pack housing close to the central line of the accommodating cavity, the busbars used for adjacent battery cells are shorter, the length of the busbars is shortened, the overall length of the busbars used is shortened, the cost is saved, the failure rate of the busbars is reduced, and the failure rate of the battery pack during use is reduced.

[0049] In addition, by arranging both the positive and negative electrodes of the battery cells near the inner sidewall of the battery pack housing close to the center line of the accommodation cavity, the space of the second electrical compartment can be released, facilitating the utilization of the space of the second electrical compartment, or reducing the space of the second electrical compartment, decreasing the overall volume of the battery pack, and facilitating the lightweight and miniaturization of the battery pack.

[0050] In summary, Figure 2 、 Figure 3 and Figure 4 Among the three embodiments in, after comparison, Figure 4 the battery pack structure disclosed in is the best.

[0051] In this technical solution, in order to shorten the overall length of the busbar and simplify the busbar routing, the battery cells 21 arranged in a matrix are connected in series in sequence.

[0052] In this technical solution, in order to further shorten the overall length of the busbar and simplify the busbar routing, the positive or negative electrode of any battery cell 21 is close to the negative or positive electrode of the adjacent battery cell 21, and they are electrically connected through the busbar 6.

[0053] In this technical solution, the busbar 6 includes a long busbar and a short busbar. The long busbars 6 are all arranged in the first electrical compartment 8, releasing the space of the second electrical compartment and facilitating the utilization of the second electrical compartment. In addition, by placing all the long busbars in the first electrical compartment and only having short busbars in the second electrical compartment, the probability of busbar failure in the second electrical compartment is reduced, making it easy to quickly locate the fault point after a battery pack failure and enabling quick repair of the battery pack.

[0054] In this technical solution, since both the positive and negative electrodes of the battery cells 21 near the inner sidewall of the battery pack housing 1 are close to the center line of the accommodation cavity, the positive and negative electrodes of the first and last battery cells among the sequentially connected battery cells will both approach the center line of the accommodation cavity. Therefore, in order to reduce the length of the busbar connecting the battery module 2 and the BDU 4, in this solution, the BDU 4 is arranged close to the center line of the accommodation cavity, and the positive and negative electrodes of the BDU 4 are respectively arranged close to the positive and negative electrodes of the battery cells 21 electrically connected to it.

[0055] In this technical solution, the BMS main board is placed in the first electrical compartment 8, the BMS slave board 5 is placed in the second electrical compartment 9, and the BMS slave board 5 is signal-conducted with the BMS main board 3 through the signal line 7. Placing the BMS slave board 5 in the second electrical compartment 9 makes full use of the space of the second electrical compartment, reduces the number of components inside the first electrical compartment, simplifies the wiring inside the first electrical compartment, and reduces the overall failure rate of the battery pack. Placing the BMS slave board 5 in the second electrical compartment 9 has a simple structure, is convenient for management and maintenance, and at the same time helps to reduce the overall volume of the battery pack.

[0056] Based on the above technical solution, the BMS slave board 5 is placed in the second electrical compartment 9, without occupying the space of the first electrical compartment, facilitating the layout and setting of the BDU, BMS main board, low-voltage wire harness, high-voltage output busbar, etc., and improving the utilization rate of the electrical compartment space of the battery pack. The length of the jumper busbar is shortened, saving costs. The process feasibility of this battery pack is higher, the operation difficulty coefficient is smaller, and the industrial packaging efficiency is improved.

[0057] Based on the above technical solution, the BMS main board is placed in the first electrical compartment 8, facilitating the BMS main board to interact with external devices (such as PCS, EMS, fire protection system, etc.) through communication interfaces (such as CAN, RS485, RS232, UART, I2C, SMBus, ModBus, etc.). Placing the BMS main board in the first electrical compartment 8 makes it unnecessary to improve the existing battery pack-related structures and devices, reducing costs.

[0058] In this technical solution, the BMS slave board 5 is electrically connected to the BMS main board 3 through a signal line 7 and adopts a daisy-chain communication method.

[0059] In this solution, another structure of the battery pack is also provided. This battery pack includes a battery pack housing 1, a battery module 2, a BDU 4, a BMS main board 3, and a BMS slave board 5. The battery pack housing 1 has an accommodation cavity inside. The battery module 2 is placed in the accommodation cavity, and a first electrical compartment 8 and a second electrical compartment 9 are respectively formed at both ends of the battery module 2.

[0060] The BMS main board 3 is placed in the first electrical compartment 8; the BMS slave board 5 is placed in the second electrical compartment 9, and the BMS slave board 5 is electrically connected to the BMS main board 3.

[0061] Based on the above technical solution, the BMS slave board 5 is placed in the second electrical compartment 9, without occupying the space of the first electrical compartment, facilitating the layout and setting of the BDU, BMS main board, low-voltage wire harness, and high-voltage output busbar in the first electrical compartment, and improving the utilization rate of the electrical compartment space of the battery pack. The process feasibility of this battery pack is higher, the operation difficulty coefficient is smaller, and the industrial packaging efficiency is improved.

[0062] In this solution, the BDU is placed in the first electrical compartment, and the BDU is electrically connected to the battery module, facilitating the connection of the BDU to the positive and negative electrodes of the battery module and shortening the length of the busbar connecting the BDU and the battery module. The battery module 2 includes a plurality of battery cells 21, and the battery cells 21 are arranged in a matrix and connected in series through a busbar 6. The positive and negative electrodes of the battery cells close to the inner sidewall of the battery pack housing are both arranged close to the center line of the accommodation cavity. The busbar 6 includes a long busbar 6 and a short busbar 6, and the long busbar 6 is all arranged in the first electrical compartment 8.

[0063] Based on the above solution, through the design and layout of the battery cells, the long busbars in the rear battery compartment of the battery pack are reduced or shortened, reducing the manufacturing cost and failure rate of the battery pack and the usage cost of the battery pack.

[0064] In this technical solution, a vehicle is also proposed, including the aforementioned battery pack. Using the battery pack in this solution in the vehicle reduces the cost of the battery pack in the vehicle, enables the battery pack to be lightweight, and the vehicle has a low failure rate and low maintenance and repair costs during use.

[0065] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: It includes a battery pack housing, a battery module, a BDU, a BMS main board and a BMS slave board. There is an accommodation cavity inside the battery pack housing; The battery module is placed in the accommodation cavity, and a first electrical compartment and a second electrical compartment are respectively formed at both ends of the battery module; The BDU is placed in the first electrical compartment, and the BDU is electrically connected to the battery module; the BMS slave board is placed in the accommodation cavity and is signal-conducted with the BMS main board; The battery module includes a plurality of battery cells. Each of the battery cells is arranged in a matrix and is connected in series through busbars. The positive and negative electrodes of the battery cells close to the inner side wall of the battery pack housing are both arranged close to the midline of the accommodation cavity.

2. The battery pack according to claim 1, characterized in that: Each of the battery cells arranged in a matrix is connected in series in sequence.

3. The battery pack according to claim 2, characterized in that: The positive electrode of any battery cell is close to the negative electrode of the adjacent battery cell and is electrically connected through the busbar; the negative electrode of any battery cell is close to the positive electrode of the adjacent battery cell and is electrically connected through the busbar.

4. The battery pack according to claim 1 or 3, characterized in that: The busbar includes a long busbar and a short busbar, and the long busbars are all arranged in the first electrical compartment.

5. The battery pack according to claim 4, wherein: The BDU is arranged close to the midline of the accommodation cavity, and the positive and negative electrodes of the BDU are respectively arranged close to the positive and negative electrodes of the battery cells electrically connected to it.

6. The battery pack according to claim 1, characterized in that: The BMS main board is placed in the first electrical compartment, the BMS slave board is placed in the second electrical compartment, and the BMS slave board is signal-conducted with the BMS main board through a signal line.

7. The battery pack according to claim 6, wherein: The BMS slave board is signal-conducted with the BMS main board through a signal line and adopts a daisy chain communication method.

8. A battery pack, characterized in that: It includes a battery pack housing, a battery module, a BDU, a BMS main board and a BMS slave board. There is an accommodation cavity inside the battery pack housing; The battery module is placed in the accommodation cavity, and a first electrical compartment and a second electrical compartment are respectively formed at both ends of the battery module; The BMS main board is placed in the first electrical compartment, the BMS slave board is placed in the second electrical compartment, and the BMS slave board is signal-conducted with the BMS main board.

9. The battery pack according to claim 8, wherein: The BDU is placed in the first electrical compartment, and the BDU is electrically connected to the battery module; The battery module includes a plurality of battery cells. Each of the battery cells is arranged in a matrix and is connected in series through busbars. The positive and negative electrodes of the battery cells close to the inner side wall of the battery pack housing are both arranged close to the midline of the accommodation cavity; the busbar includes a long busbar and a short busbar, and the long busbars are all arranged in the first electrical compartment.

10. A vehicle, characterized in that, It includes the battery pack according to any one of claims 1 to 9.

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