CN218957829U - Power battery pack monitoring device and vehicle - Google Patents
Power battery pack monitoring device and vehicle Download PDFInfo
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- CN218957829U CN218957829U CN202222757910.7U CN202222757910U CN218957829U CN 218957829 U CN218957829 U CN 218957829U CN 202222757910 U CN202222757910 U CN 202222757910U CN 218957829 U CN218957829 U CN 218957829U
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Abstract
The utility model discloses a power battery pack monitoring device and a vehicle. The power battery pack monitoring device includes: the battery pack comprises a power battery pack box body, a plurality of battery cell module units and a host battery management system device, wherein the battery cell module units are fixed in the power battery pack box body, a slave battery management system device is fixed on a module upper cover of each battery cell module unit, a battery cell of each battery cell module unit is electrically connected with one end of a flexible circuit board, the other end of the flexible circuit board is electrically connected with the slave battery management system device, and a plurality of slave battery management system devices are in communication connection with the host battery management system device. The utility model reduces the wire diameter of the wire harness accessing the slave battery management system device. Meanwhile, the wiring length of the flexible circuit board is shortened, the wiring scheme of the wiring harness is simplified, and the occupation of the space in the power battery pack is reduced.
Description
Technical Field
The utility model relates to the technical field of vehicles, in particular to a power battery pack monitoring device and a vehicle.
Background
The automobile power battery (PACK) needs to be managed by sampling the voltage and the temperature of each cell unit through a battery management system (Battery Management System, BMS) so as to meet the normal charge and discharge working condition demands of the power battery. Current power cell packs typically consist of a plurality of cells that form a cell module unit, and a plurality of cell module units form the entire power cell. The battery cell module unit is connected to each battery cell lug through a flexible circuit board (Flexible Printed Circuit, FPC), the FPC is connected with a low-voltage wire harness inside a power battery pack through a wire harness interface, the low-voltage wire harness is connected with a slave BMS through the wire harness interface, the slave BMS is connected with a host BMS through the low-voltage wire harness inside the battery pack through sampling processing, and sampling and transmission from each battery cell to the host BMS are achieved.
The current cell sampling and signal transmission scheme mainly has the following defects:
1. the arrangement space requirement is high, and the slave BMS needs to be independently arranged and the connection harness from the module to the slave BMS needs to occupy the space in the power battery pack.
The slave BMS typically manages the sampling of the plurality of cell module units, which requires the connection of the module FPC harness interface to the slave BMS harness interface of the harness within the battery pack. The wire diameter of each module wire harness branch (i.e., wire harness diameter) is currently approximately 8-10mm, the wire diameter is increased to 20-30mm when the module wire harness is converged to the slave BMS, and extra space is required for wire harness wiring installation and protection reservation. In addition, the slave BMSs, which are independently arranged, also require installation space and connector insertion/extraction space, which together occupy a large amount of space in the battery pack.
2. The redundancy and complexity of the connections results in heavy weight, limiting the battery pack energy density increase.
Since a large number of connection harnesses are required from the module to the slave BMS, generally about 2kg, the battery pack energy density is restricted from being further improved.
3. The number of the connecting nodes is large, and the failure risk is increased.
Module FPC passes through the low-voltage harness and is connected the distributed sampling that realizes the module with slave BMS, has increased connected the node through low-voltage harness transfer connection, and every node inefficacy has certain probability, and the failure probability of whole sampling is amplified because of increasing the node in series connection.
4. Too many interfaces and harness fixing points lead to low production mode efficiency and are not beneficial to automatic production.
Because the production efficiency of the internal wire harness is low, the working procedure is complex, the labor input is large and the automatic production cannot be realized, and the assembly of the wire harness on the battery pack cannot be realized automatically, so that the production efficiency of the whole vehicle is influenced.
5. The cost is high, a large number of connecting wire harnesses are still needed from the module FPC to the slave BMS, and excessive interfaces increase the cost of the whole sampling system.
The module FPC still requires a large number of connection harnesses and interfaces to the slave BMS, which increases the need for additional cables and connectors while considering the increased influence of the harnesses on the production man-hour, resulting in an increase in the cost of the entire system.
Disclosure of Invention
Based on the above, it is necessary to provide a power battery pack monitoring device and a vehicle, which solve the technical problems of high arrangement space requirement and complicated circuit of the battery management system in the prior art for monitoring the power battery pack.
The utility model provides a power battery pack monitoring device, comprising: the battery pack comprises a power battery pack box body, a plurality of battery cell module units and a host battery management system device, wherein the battery cell module units are fixed in the power battery pack box body, a slave battery management system device is fixed on a module upper cover of each battery cell module unit, a battery cell of each battery cell module unit is electrically connected with one end of a flexible circuit board, the other end of the flexible circuit board is electrically connected with the slave battery management system device, and a plurality of slave battery management system devices are in communication connection with the host battery management system device.
The flexible circuit board of the utility model is not required to be connected to the slave battery management system device after being assembled, so that the wire diameter of the wire harness connected to the slave battery management system device is reduced. Meanwhile, the secondary battery management system device is fixed on the module upper cover of the battery cell module unit, so that the wiring length of the flexible circuit board is shortened, the wiring scheme of the wire harness is simplified, and the occupation of the space in the power battery pack is reduced.
Further, the slave cell battery management system device is adjacent to the module end plate on the side of the cell module unit to which it is secured.
The secondary battery management system device is arranged close to the end plate of the one-side module, so that the flexible circuit board is placed conveniently, bending of the flexible circuit board is avoided, and the failure rate of the flexible circuit board is reduced.
Further, a plurality of the slave battery management system devices are communicatively connected with the master battery management system device through a communication harness.
The slave battery management system device only needs to be connected with the host battery management system device through the communication wire harness, the wire diameter of the communication wire harness is small, and various bending can be conveniently carried out, so that wiring is convenient, a wiring scheme is simplified, and occupation of space in a power battery pack is reduced.
Further, a groove is formed between two adjacent cell module units, and the communication wire harness is arranged in the groove.
In the embodiment, the communication wire harness is arranged in the groove between the two adjacent cell module units, so that the communication wire harness is convenient to wire.
Further, the slave battery management system device is provided with a first interface connected with the flexible circuit board and a second interface connected with the communication wire harness.
In this embodiment, the slave battery management system device is provided with the first interface and the second interface respectively, so that the flexible circuit board and the communication harness are connected.
Further, the secondary battery management system device is a secondary battery management system circuit board welded and fixed on the module upper cover.
The secondary battery cell management system circuit board welded and fixed on the upper cover of the module is used as the secondary battery cell management system device, so that the position of the secondary battery cell management system device is guaranteed to be fixed, and meanwhile, the secondary battery cell management system device is the secondary battery cell management system circuit board, so that the secondary battery cell management system device does not have a separate protective shell, and the system cost is reduced as a whole.
Further, one end of the flexible circuit board is electrically connected with the tab of the battery cell.
The flexible circuit board of the embodiment is electrically connected with the lugs of the battery cell, so that all sampling signals of the battery cell are obtained.
Further, the other end of the flexible circuit board is electrically connected with the slave battery management system device through a connector.
The flexible circuit board of the embodiment is only required to be directly and electrically connected with the slave battery management system device through one connector, so that a connection interface is reduced, the connection failure risk is reduced, and meanwhile, the harness is simplified, so that the system cost is integrally reduced.
Further, the other end of the flexible circuit board is soldered to the slave battery management system device.
The flexible circuit board and the slave battery management system device are directly welded, so that a connection interface is reduced, the risk of connection failure is reduced, and meanwhile, the harness is simplified, so that the system cost is reduced as a whole.
Still further, four electric core module units are evenly and fixedly arranged in the power battery pack box body.
In the embodiment, only four battery cell module units are uniformly arranged in the whole power battery pack box body, so that the structure is simplified, and the occupation of the space in the pack is reduced.
The utility model provides a vehicle comprising a power battery pack monitoring device as described above.
The flexible circuit board of the utility model is not required to be connected to the slave battery management system device after being assembled, so that the wire diameter of the wire harness connected to the slave battery management system device is reduced. Meanwhile, the secondary battery management system device is fixed on the module upper cover of the battery cell module unit, so that the wiring length of the flexible circuit board is shortened, the wiring scheme of the wire harness is simplified, and the occupation of the space in the power battery pack is reduced.
Drawings
FIG. 1 is a schematic diagram of a power battery pack monitoring device according to an embodiment of the present utility model;
FIG. 2 is an enlarged schematic view of a portion of a slave battery management system device of a power battery pack monitoring device according to another embodiment of the present utility model;
fig. 3 is an enlarged schematic view of a portion of a host battery management system device of a power battery pack monitoring device according to another embodiment of the present utility model.
Description of the marking
1-a power battery pack box body; 2-cell module unit; 21-a module upper cover; 22-cell; 23-module end plates; 24-grooves; 3-host battery management system means; 31-host battery management system device communication interface; 4-slave battery management system means; 41-a first interface; 42-a second interface; a 5-flexible circuit board; a 51-connector; 6-communication wire harness.
Detailed Description
Specific embodiments of the present utility model will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Fig. 1 is a schematic structural diagram of a power battery pack monitoring device according to an embodiment of the present utility model, including: the battery pack comprises a power battery pack box body 1, a plurality of battery cell module units 2 and a host battery management system device 3, wherein the battery cell module units 2 are fixed in the power battery pack box body 1, a slave battery management system device 4 is fixed on a module upper cover 21 of each battery cell module unit 2, a battery cell 22 of each battery cell module unit 2 is electrically connected with one end of a flexible circuit board 5, the other end of the flexible circuit board 5 is electrically connected with the slave battery management system device 4, and a plurality of slave battery management system devices 4 are in communication connection with the host battery management system device 3.
Specifically, the plurality of cell module units 2 are fixedly connected in the power battery pack case 1, and the host battery management system device 3 is fixedly connected to one side of the power battery pack case 1. Each cell module unit 2 includes a plurality of cells 22, and a module upper cover 21 is covered over the cells 22. The slave battery management system device 4 is fixed to the module upper cover 21. For example, the slave battery management system device 4 is welded to the module upper cover 21. Each cell module unit 2 is further provided with a flexible circuit board 5, one end of the flexible circuit board 5 is electrically connected with the cell 22 for sampling, and the flexible circuit board 5 for collecting all sampling signals is directly connected with the slave cell management system device 4 integrated on the module upper cover.
The integrated battery cell module unit 2 only provides an external wire harness communication interface by the slave battery management system device 4, and the communication interface of each slave battery management system device 4 is in communication connection with the host battery management system device 3 to realize interactive communication. The slave battery management system device 4 and the master battery management system device 3 adopt the existing battery management system communication mode to complete the sampling and management of the battery cells by the whole battery management system.
The flexible circuit board of the utility model is not required to be connected to the slave battery management system device after being assembled, so that the wire diameter of the wire harness connected to the slave battery management system device is reduced. Meanwhile, the secondary battery management system device is fixed on the module upper cover of the battery cell module unit, so that the wiring length of the flexible circuit board is shortened, the wiring scheme of the wire harness is simplified, and the occupation of the space in the power battery pack is reduced.
In one embodiment, the slave cell battery management system device 4 is located adjacent to the module end plate 23 on the side of the cell module unit 2 to which it is secured.
Specifically, the slave cell battery management system device 4 is positioned adjacent to the module end plate 23 on the side of the cell module unit 2. The flexible circuit board 5 is inserted into the battery cell 22 from the other side module end plate 23, and is fitted to the module upper cover 21, extending to the module end plate 23 at the other end, to be electrically connected with the slave battery management system device 4.
The secondary battery management system device is arranged close to the end plate of the one-side module, so that the flexible circuit board is placed conveniently, bending of the flexible circuit board is avoided, and the failure rate of the flexible circuit board is reduced.
In one embodiment, a plurality of the slave battery management system devices 4 are communicatively coupled to the master battery management system device 3 via a communication harness 6.
Specifically, the integrated battery cell module unit 2 only provides an external wire harness communication interface by the slave battery management system device 4, the power battery wire harness only needs to reserve the communication wire harness 6, and the communication interfaces of the slave battery management system devices 4 are in communication connection with the host battery management system device communication interface 31 of the host battery management system device 3 through the communication wire harness 6, so that interactive communication is realized, and the whole battery management system is used for sampling and managing the battery cells.
The slave battery management system device only needs to be connected with the host battery management system device through the communication wire harness, the wire diameter of the communication wire harness is small, and various bending can be conveniently carried out, so that wiring is convenient, a wiring scheme is simplified, and occupation of space in a power battery pack is reduced.
In one embodiment, a groove 24 is formed between two adjacent cell module units 2, and the communication harness 6 is arranged in the groove 24.
In the embodiment, the communication wire harness is arranged in the groove between the two adjacent cell module units, so that the communication wire harness is convenient to wire.
In one embodiment, the slave battery management system device is provided with a first interface 41 connected to the flexible circuit board 5 and a second interface 42 connected to the communication harness 6.
Specifically, the first interface 41 is a communication interface in communication connection with the flexible circuit board 5, and the second interface 42 is a communication interface in communication connection with the communication harness 6.
In this embodiment, the slave battery management system device is provided with the first interface and the second interface respectively, so that the flexible circuit board and the communication harness are connected.
In one embodiment, the slave battery management system device 4 is a slave battery management system circuit board that is soldered to the module top cover 21.
Specifically, the slave battery management system circuit board is fixed to the module upper cover 21 by soldering, and a first interface 41 connected to the flexible circuit board 5 and a second interface 42 connected to the communication harness 6 are provided on the slave battery management system circuit board. The first interface 41 and the second interface 42 are preferably soldered to the slave battery management system circuit board.
The secondary battery cell management system circuit board welded and fixed on the upper cover of the module is used as the secondary battery cell management system device, so that the position of the secondary battery cell management system device is guaranteed to be fixed, and meanwhile, the secondary battery cell management system device is the secondary battery cell management system circuit board, so that the secondary battery cell management system device does not have a separate protective shell, and the system cost is reduced as a whole.
In one embodiment, one end of the flexible circuit board 5 is electrically connected to the tab of the battery cell 22.
Specifically, the flexible circuit board 5 for module sampling is preferably sampled by soldering the nickel tab to the tab of the battery cell 22, and the flexible circuit board 5 collecting all sampled signals is directly connected with the slave battery management system device 4 integrated in the module upper cover
The flexible circuit board of the embodiment is electrically connected with the lugs of the battery cell, so that all sampling signals of the battery cell are obtained.
In one embodiment, the other end of the flexible circuit board 5 is electrically connected to the slave battery management system device 4 via a connector 51.
Specifically, since the flexible circuit board 5 only needs to be directly connected to the slave cell battery management system device 4, there is no need to aggregate a plurality of flexible circuit boards 5, and therefore only one connector 51 is required to be connected to the slave cell battery management system device.
The flexible circuit board of the embodiment is only required to be directly and electrically connected with the slave battery management system device through one connector, so that a connection interface is reduced, the connection failure risk is reduced, and meanwhile, the harness is simplified, so that the system cost is integrally reduced.
In one embodiment, the other end of the flexible circuit board 5 is soldered to the slave battery management system device 4.
The flexible circuit board and the slave battery management system device are directly welded, so that a connection interface is reduced, the risk of connection failure is reduced, and meanwhile, the harness is simplified, so that the system cost is reduced as a whole.
In one embodiment, four battery cell module units 2 are uniformly and fixedly arranged in the power battery pack box body 1.
In the embodiment, only four battery cell module units are uniformly arranged in the whole power battery pack box body, so that the structure is simplified, and the occupation of the space in the pack is reduced.
As a preferred embodiment of the present utility model, as shown in fig. 1, only four large cell module units 2 are arranged in a power cell pack case 1. The distributed sampling of this embodiment is to integrate the slave cell battery management system device 4 directly with the cell battery unit 2. As shown in fig. 2, the integrated cell module unit 2 is interfaced with the second interface 42 of the slave cell management system device 4 as an external harness communication interface. The wire harness communication interface is. The power battery harness only needs to reserve the communication harness 6, as shown in fig. 2 and 3, the second interface 42 of each slave battery management system device 4 is connected with the communication interface 31 of the host battery management system device 3 through the communication harness 6, so that interactive communication is realized, and the sampling and management of the battery cells of the whole battery management system are completed.
The present embodiment fully utilizes the space of the module upper cover 21 of the cell module unit 2, and fixedly welds the circuit board (Printed Circuit Board, PCB) of the slave cell battery management system device 4 to the module upper cover 21, thereby integrating the slave cell battery management system device 4 to the cell module unit 2, and positioning the slave cell battery management system device 4 close to one side of the two side module end plates 23.
A flexible circuit board (Flexible Printed Circuit, FPC) 5 for module sampling is sampled by soldering a nickel plate to the tab of the battery cell 22 included in the battery cell module unit 2, the flexible circuit board 5 collecting all sampled signals is directly connected with the slave battery management system device 4 integrated in the module upper cover 21, and the flexible circuit board 5 can be connected from the first interface 41 of the battery management system device 4 by means of a connector 51 or soldering.
Functionally, the wiring harness in the power battery pack only needs to retain a communication loop, so that only the communication wiring harness 6 needs to be provided in the battery pack to connect the second interfaces 42 of the slave battery management system devices 4 on the four battery module units 2 with the master battery management system device communication interfaces 31 of the master battery management system device 3.
Compared with the distributed wire harness scheme in the prior art, the wire harness design in the power battery pack of the embodiment is greatly simplified and reduced, the wire diameter of the wire harness of the embodiment is only 5 mm, the wiring path is extremely short, and the occupation of the space in the pack is reduced. In addition, the slave cell battery management system device and the cell module unit are highly integrated, and after the wire harness is simplified, the weight of the whole sampling and transmission system is expected to be reduced by 70%, and the battery energy density is improved. The connection interface of the flexible circuit board for module sampling to the slave battery management system device is reduced by one, and the connection failure risk is reduced. Compared with the independent arrangement scheme in the prior art, the embodiment of the integration scheme of the secondary battery cell management system device and the battery cell module unit can protect the secondary battery cell management system device by the power battery pack, so that the protective shell of the secondary battery cell management system device is reduced, one connecting interface is also reduced due to the fact that the flexible circuit board is directly connected with the secondary battery cell management system device, and meanwhile, the harness is simplified, so that the system cost is reduced as a whole. The embodiment reduces more than 80% of wire harnesses in the battery pack, reduces the manual installation work of connectors, simultaneously reduces wire harness installation points due to wire harness simplification, and greatly improves the automatic production efficiency of the power battery pack.
The utility model provides a vehicle comprising a power battery pack monitoring device as described above.
The flexible circuit board of the utility model is not required to be connected to the slave battery management system device after being assembled, so that the wire diameter of the wire harness connected to the slave battery management system device is reduced. Meanwhile, the secondary battery management system device is fixed on the module upper cover of the battery cell module unit, so that the wiring length of the flexible circuit board is shortened, the wiring scheme of the wire harness is simplified, and the occupation of the space in the power battery pack is reduced.
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A power battery pack monitoring device, comprising: the battery pack comprises a power battery pack box body (1), a plurality of battery cell module units (2) and a host battery management system device (3), wherein the battery cell module units (2) are fixed in the power battery pack box body (1), a slave battery management system device (4) is fixed on a module upper cover (21) of each battery cell module unit (2), a battery cell (22) of each battery cell module unit (2) is electrically connected with one end of a flexible circuit board (5), the other end of the flexible circuit board (5) is electrically connected with the slave battery management system device (4), and a plurality of slave battery management system devices (4) are in communication connection with the host battery management system device (3).
2. The power cell pack monitoring device according to claim 1, wherein the slave battery management system device (4) is located close to a module end plate (23) on the side of the cell module unit (2) to which it is fixed.
3. The power battery pack monitoring device according to claim 1, wherein a plurality of the slave battery management system devices (4) are communicatively connected to the master battery management system device (3) via a communication harness (6).
4. A power cell pack monitoring device according to claim 3, characterized in that a groove (24) is provided between two adjacent cell module units (2), the communication harness (6) being arranged in the groove (24).
5. A power battery pack monitoring device according to claim 3, wherein the slave battery management system device is provided with a first interface (41) connected to the flexible circuit board (5) and a second interface (42) connected to the communication harness (6).
6. The power battery pack monitoring device according to claim 1, wherein the slave battery management system device (4) is a slave battery management system circuit board welded to the module upper cover (21).
7. The power battery pack monitoring device according to claim 1, wherein one end of the flexible circuit board (5) is electrically connected with a tab of the electric core (22).
8. The power battery pack monitoring device according to claim 1, wherein the other end of the flexible circuit board (5) is electrically connected with the slave battery management system device (4) through a connector (51).
9. The power battery pack monitoring device according to claim 1, wherein the other end of the flexible circuit board (5) is soldered to the slave battery management system device (4).
10. A vehicle comprising the power battery pack monitoring device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222757910.7U CN218957829U (en) | 2022-10-19 | 2022-10-19 | Power battery pack monitoring device and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222757910.7U CN218957829U (en) | 2022-10-19 | 2022-10-19 | Power battery pack monitoring device and vehicle |
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| CN218957829U true CN218957829U (en) | 2023-05-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117141218A (en) * | 2023-10-31 | 2023-12-01 | 江苏速豹动力科技有限公司 | Power battery system and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117141218A (en) * | 2023-10-31 | 2023-12-01 | 江苏速豹动力科技有限公司 | Power battery system and vehicle |
| CN117141218B (en) * | 2023-10-31 | 2024-02-23 | 江苏速豹动力科技有限公司 | Power battery system and vehicle |
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Effective date of registration: 20230815 Granted publication date: 20230502 |