Battery management system and electric vehicle

Abstract

The utility model relates to a battery management system and an electric vehicle. The battery management system comprises a plurality of near-field coupling lines; the battery assembly comprises a plurality of battery cells and a plurality of battery cell acquisition boards, the plurality of battery cells are connected in series, a single battery cell acquisition board is integrated on each battery cell, and each battery cell acquisition board is in communication connection with a single near-field coupling line; the plurality of Balums are connected with the plurality of near-field coupling lines in a one-to-one correspondence manner; the input end of the all-in-one synthesizer is in communication connection with the plurality of Balums in a one-to-one correspondence manner; and the battery management unit is in communication connection with the output end of the all-in-one synthesizer. The number of radio frequency connectors used in the battery management system can be reduced, and the production cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of terminal technologies, and in particular, to a battery management system and an electric vehicle. Background Art

[0002] A battery management system (BMS, Battery Management System) is a control system for protecting the safe use of power batteries. The battery management system can be used to monitor the usage status of the batteries at all times, providing guarantee for the safe use of electric vehicles. Utility Model Content

[0003] This application provides a battery management system and an electric vehicle to solve the deficiencies in the related technologies.

[0004] According to the first aspect of the embodiments of this application, a battery management system is provided, including:

[0005] Multiple near-field coupling lines;

[0006] A battery assembly, including multiple battery cells and multiple battery cell acquisition boards. The multiple battery cells are connected in series, and each of the battery cells integrates a single battery cell acquisition board. Each battery cell acquisition board is communicatively connected to a single near-field coupling line;

[0007] Multiple baluns, and the multiple baluns are respectively connected to the multiple near-field coupling lines in one-to-one correspondence;

[0008] A multi-in-one synthesizer, and the input end of the multi-in-one synthesizer is communicatively connected to the multiple baluns in one-to-one correspondence;

[0009] A battery management unit, and the battery management unit is communicatively connected to the output end of the multi-in-one synthesizer.

[0010] Optionally, the output ends of the multiple baluns are located on the same side of the battery assembly.

[0011] Optionally, the battery management unit includes a processing chip and a transceiver module communicatively connected to the processing chip. The transceiver module is communicatively connected to the output end of the multi-in-one synthesizer.

[0012] Optionally, the multiple battery cells are arranged in multiple rows, and each row of the battery cells is arranged side by side along the thickness direction of the battery cells;

[0013] The length direction of the near-field coupling line is parallel to the side-by-side direction of each row of the battery cells, and each row of the battery cells is arranged between two near-field coupling lines. The battery cell acquisition board is coupled to the relatively closer near-field coupling line.

[0014] Optionally, each of the battery cells has a positive terminal and a negative terminal. The positive terminal and the negative terminal of the same battery cell are arranged opposite to each other in the length direction of the battery cell. The battery cell acquisition board is integrated on the side of the battery cell where the negative terminal is arranged.

[0015] Each row of the battery cells includes a first side and a second side. The first side is arranged adjacent to one of the near-field coupling lines, and the second side is arranged adjacent to the other near-field coupling line.

[0016] On the first side or the second side of each row of the battery cells, the positive terminals and the negative terminals are arranged alternately, and the different terminals of two adjacent battery cells in the same row of the battery cells are conductively connected.

[0017] Optionally, each row of the battery cells includes a first side and a second side. The first side is arranged adjacent to one of the near-field coupling lines, and the second side is arranged adjacent to the other near-field coupling line.

[0018] Among the multiple battery cell integration boards included in each row of the battery cells, at least one battery cell acquisition board located on the second side is spaced between two adjacent battery cell acquisition boards located on the first side.

[0019] Optionally, each of the battery cell acquisition boards includes an acquisition chip and an antenna. The antenna is connected to the acquisition chip, and the antenna and the near-field coupling line are coupled to transmit signals.

[0020] Optionally, the antenna of each of the battery cell acquisition boards is arranged adjacent to the near-field coupling line and maintains a predetermined coupling distance from the near-field coupling line.

[0021] Optionally, the antenna of each of the battery cell acquisition boards is arranged adjacent to the near-field coupling line and maintains a predetermined coupling distance from the near-field coupling line.

[0022] Optionally, the coupling distance between the near-field coupling line and each of the battery cell acquisition boards is greater than 0 and less than or equal to 5 millimeters.

[0023] According to a second aspect of the embodiments of the present application, there is provided an electric vehicle including the battery management system as described in any one of the above.

[0024] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0025] In the present application, through the one-to-one connection between the balun and the near-field coupling line, the number of radio frequency connectors used can be reduced, which is beneficial to reducing the production cost. Moreover, the signal parameters of each near-field coupling line can be transmitted to the multi-in-one synthesizer through the balun and then reach the battery management unit without passing through other near-field coupling lines, which can shorten the signal transmission path and reduce the attenuation of radio frequency signals.

[0026] As can be seen from the above embodiments, in the technical solution of the present application, it should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Brief Description of the Drawings

[0027] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0028] Figure 1 is a partial schematic diagram of a battery management system in the related art.

[0029] Figure 2 is a partial connection schematic diagram of a battery management system shown according to an exemplary embodiment in the present application.

[0030] Figure 3 is a partial three-dimensional schematic diagram of a battery management system shown according to an exemplary embodiment in the present application.

[0031] Description of the Reference Numerals

[0032] 1, near-field coupling line; 2, battery assembly; 21, battery cell; 22, battery cell acquisition board; 3, balun; 4, multi-in-one synthesizer; 5, battery management unit; 51, processing chip; 52, transceiver module. Detailed Embodiments

[0033] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0034] The battery management system and electric vehicle of the present application will be described in detail below with reference to the drawings. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0035] Figure 1 is a partial schematic diagram of a battery management system in the related art, as Figure 1As shown in the figure, the battery management system includes a battery assembly 101 and a near-field coupling line 102. Each battery cell of the battery assembly 101 is integrated with a single battery cell acquisition board. The near-field coupling line 102 can obtain the signal parameters collected by the battery cell acquisition board and further transmit the signal parameters to the battery management unit of the battery management system. In the actual production process, due to the large number of battery cells in the battery assembly 101, it is not practical to wind the battery assembly 101 through a single near-field coupling line during actual operation. Therefore, as Figure 1 shown, the near-field coupling line 102 is usually divided into multiple parallel line segments, and a connecting RF wire harness 103 is arranged between adjacent segments. Then, the near-field coupling line 102 and the RF wire harness 103 are connected through an RF connector 104.

[0036] Although signal transmission can be achieved through the RF connector 104, the use of multiple RF connectors 104 increases the production cost, and the extension of the signal transmission path will also cause attenuation of the RF signal to a certain extent.

[0037] Based on this, Figure 2 is a schematic structural diagram of a battery management system shown according to an exemplary embodiment. As Figure 2 shown, a battery management system according to an embodiment of the present application includes four near-field coupling lines 1, a battery assembly 2, a balun 3, a multi-in-one synthesizer 4, and a battery management unit 5. Among them, the battery assembly 2 may include blade batteries.

[0038] As Figure 2 and Figure 3 shown, the battery assembly 2 includes two rows of battery cells 21 and multiple battery cell acquisition boards 22. The battery cells 21 in each row are connected in series, and the two rows of battery cells 21 are connected in series. A single battery cell acquisition board 22 is integrated on each battery cell 21, and the battery cell acquisition board 22 on each battery cell 21 can collect the voltage and temperature of a single battery cell. By integrating a battery cell acquisition board 22 on each battery cell 21, electronic tagging management of each battery cell 21 can be realized. In addition, by integrating a battery cell acquisition board 22 on each battery cell 21, since the voltage of each battery cell 21 is not too high, for example, less than 4.2V (volt), there will be no problem of abnormal high voltage of the battery cell 21 caused by connection problems, so the safety is better.

[0039] Each battery cell acquisition board 22 can be communicatively connected to a single near-field coupling line 1, so as to transmit the signal parameters collected by the battery cell acquisition board 22 to the near-field coupling line 1. Of course, the received signal instructions can also be transmitted to the battery cell acquisition board 22 through the near-field coupling line 1, that is, a two-way communication mode can be established between each battery cell acquisition board 22 and the single near-field coupling line 1. For example, each battery cell acquisition board 22 can include an acquisition chip and an antenna (not shown). The antenna is connected to the acquisition chip and is also coupled to the near-field coupling line 1 to transmit signals. For example, the acquisition chip on the battery cell acquisition board 22 of the present application uses near-field radio frequency communication technology (NFC, Near Field Communication). Therefore, the anti-interference ability is stronger, the reliability of the data is enhanced, and thus better security, robustness, anti-interference ability, etc. are achieved. At the same time, the transmission power of the near-field radio frequency is relatively low, which can better reduce energy consumption.

[0040] In some embodiments, the antenna of each battery cell acquisition board 22 is arranged adjacent to the near-field coupling line 1 to avoid other metal parts between the antenna and the near-field coupling line 1, which may affect the signal transmission between the battery cell acquisition board 22 and the near-field coupling line 1. For example, a holding member can be arranged on each battery cell 21, and the near-field coupling line 1 can be located on the holding member of each battery cell 21, so as to ensure a predetermined coupling distance between the antenna of each battery cell acquisition board 22 and the near-field coupling line 1. Optionally, the coupling distance between the near-field coupling line 1 and each battery cell acquisition board 22 is less than 5 millimeters.

[0041] Still taking Figure 2 and Figure 3 as shown, the battery management system in an embodiment of the present application may include four baluns 3, and the four baluns 3 are respectively and correspondingly connected to four near-field coupling lines 1. Through the baluns 3, the differential signals received by the near-field coupling lines 1 from the battery cell acquisition boards 22 can be converted into single-port signals for output. The input ends of the multi-in-one synthesizer 4 are communicatively connected to the four baluns 3 respectively, and the battery management unit 5 is communicatively connected to the output end of the multi-in-one synthesizer 4. In this way, through the signal transmission path of the battery cell acquisition board 22 - near-field coupling line 1 - balun 3 - multi-in-one synthesizer 4 - battery management unit 5, signal transmission can be realized.

[0042] Among them, the output ends of the multiple baluns 3 are located on the same side of the battery assembly 2. For example, as Figure 2 shown, the output ends of the multiple baluns 3 are all located on the right side of the battery assembly 2, which is beneficial to the connection between the multiple baluns 3 and the multi-in-one synthesizer 4, reduces the wiring harness, and simplifies the circuit design. The battery management unit 5 includes a processing chip 51 and a transceiver module 52 communicatively connected to the processing chip 51. The transceiver module 52 is communicatively connected to the output end of the multi-in-one synthesizer 4, and the transceiver module 52 is used for modulating or demodulating the transmission signals.

[0043] In this technical solution, by connecting the balun 3 and the near-field coupling line 1 one by one, the number of RF connectors used can be reduced, which is beneficial to reducing the production cost. Moreover, the signal parameters of each near-field coupling line 1 can be transmitted to the multi-in-one synthesizer 4 through the balun 3 and then reach the battery management unit 5 without passing through other near-field coupling lines 1, which can shorten the signal transmission path and reduce the attenuation of RF signals.

[0044] In the embodiment of the present application, the battery management system including two rows of battery cells 21 is taken as an example for illustration. In other embodiments, the number of rows of battery cells 21 can be designed according to the actual situation. For example, it can include a single row of battery cells or three or more rows of battery cells 21. The present application does not limit this. In some embodiments, the number of rows of battery cells 21 and the number of near-field coupling lines 1 are in a double relationship, that is, N rows of battery cells can be correspondingly provided with 2N near-field coupling lines 1, which is beneficial to reducing the information carrying capacity of a single near-field coupling line 1. Similarly, taking the battery management system including four near-field coupling lines 1 as an example for illustration. In other embodiments, the battery management system can also include other numbers of near-field coupling lines 1, which are specifically designed according to actual needs. Similarly, taking the battery management system including four baluns 3 as an example for illustration. In other embodiments, the battery management system can also include other numbers of baluns 3, and the number of baluns 3 is equal to the number of near-field coupling lines 1.

[0045] In some embodiments, the multiple battery cells 21 in each row of battery cells 21 are arranged side by side in the thickness direction of the battery cell. For example Figure 2 as shown in, in the direction from top to bottom, that is, the direction indicated by arrow A, the multiple battery cells 21 of the first row of battery cells 21 are arranged side by side in the left-right direction, that is, along Figure 2 the direction indicated by arrow B in; in the direction from top to bottom, the multiple battery cells 21 of the second row of battery cells 21 are also arranged along the direction indicated by arrow B. The length direction of the near-field coupling line 1 is parallel to the side-by-side direction of the multiple battery cells 21, that is, the near-field coupling line 1 is also arranged along Figure 2 the direction indicated by arrow B in. Each row of battery cells 21 is arranged between two near-field coupling lines 1, and the battery cell acquisition board 22 is coupled with the relatively close near-field coupling line 1. Based on this, the battery cell acquisition board 22 integrated by the multiple battery cells 21 in the same row of battery cells 21 can be coupled with two near-field coupling lines 1, which can reduce the number of battery cell acquisition boards 22 coupled with a single coupling line 1 and can reduce the transmission requirements for the near-field coupling line 1.

[0046] For example, each cell 21 has a positive electrode column and a negative electrode column, and the positive electrode column and the negative electrode column of the same cell 21 are arranged opposite to each other in the length direction of the cell, and the length direction of the cell is arranged perpendicular to the thickness direction of the cell. Each row of cells 21 includes a first side and a second side, the first side is arranged adjacent to one near-field coupling line 1, and the second side is arranged adjacent to another near-field coupling line 1; for example Figure 2 As shown in , taking the first row of battery cells 21 in the direction indicated by arrow A as an example, the first side of the first row of battery cells 21 is the side away from the direction indicated by arrow A, and the second side is the side pointing to the direction indicated by arrow A, and a near-field coupling line 1 is arranged on the first side and the second side of the first row of battery cells 21, respectively. The positive poles and the negative poles on the first side of each row of battery cells 21 are arranged alternately, and the positive poles and the negative poles on the second side of each row of battery cells 21 are arranged alternately, that is, the positive poles and the negative poles of two adjacent battery cells 21 are arranged oppositely in the length direction of the battery cells, and different poles of two adjacent battery cells 21 in the same row of battery cells 21 are conductively connected. The battery cell collection board 22 is integrated on the side of the battery cell 21 where the negative pole is provided. Still with Figure 3 For example, taking the direction indicated by arrow C as the direction from front to back, taking the next row of battery cells 21 as an example, from left to right, the first battery cell, the third battery cell, the fifth battery cell... the negative poles are all located in the front, and the second battery cell, the fourth battery cell, the sixth battery cell... the negative poles are all located in the back, so the battery cell collection boards of the second battery cell, the fourth battery cell, the sixth battery cell and other even-numbered battery cells couple and transmit signals with the near-field coupling line 1 located in the back; the battery cell collection boards of the first battery cell, the third battery cell, the fifth battery cell and other odd-numbered battery cells couple and transmit signals with the near-field coupling line 1 located in the front. Figure 3 The previous row of battery cells 21 from the front to the back can be implemented for reference and will not be described in detail here.

[0047] In the aforementioned embodiment, the coupling scheme between the cell collection board 22 and the near-field coupling line 1 is described by taking the case that the positive poles and negative poles of two adjacent cells 21 are arranged oppositely in the length direction of the cells as an example. In other embodiments, among the multiple cell collection boards 22 integrated in each row of cells 21, at least one cell collection board 22 located on the second side is spaced between two adjacent cell collection boards 22 located on the first side of the row of cells 21. Taking the case that the cell collection board 22 is integrated on the side of the cell 21 where the negative pole is arranged, one or more cells 21 with different positive poles and negative poles arranged in different directions may be arranged between two cells 21 with the same arrangement of the positive pole and the negative pole, and the specific design may be made according to actual needs.

[0048] It can be understood that the above are only some illustrative embodiments of the battery management system of the present application. Without departing from the creative essence of the present application, some structures of the battery management system 100 of the present application can be equivalently or similarly transformed, and all of them will be covered by the protection scope defined by the appended claims of the present application.

[0049] The present application also provides an electric vehicle. The electric vehicle includes the battery management system described above.

[0050] The electric vehicle of the present application can have beneficial technical effects similar to those of the battery management system described above. Therefore, they will not be elaborated here.

[0051] The battery management system and the electric vehicle provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the battery management system and the electric vehicle of the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the spirit and principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the protection scope of the appended claims of the present application.

Claims

1. A battery management system, characterized in that, Comprising: Multiple near-field coupling lines; A battery assembly, including multiple battery cells and multiple battery cell acquisition boards. The multiple battery cells are connected in series, and each of the battery cells integrates a single one of the battery cell acquisition boards. Each of the battery cell acquisition boards is communicatively connected to a single one of the near-field coupling lines; Multiple baluns, with the multiple baluns being connected to the multiple near-field coupling lines in one-to-one correspondence; A multi-in-one synthesizer, the input end of the multi-in-one synthesizer being communicatively connected to the multiple baluns in one-to-one correspondence; A battery management unit, the battery management unit being communicatively connected to the output end of the multi-in-one synthesizer.

2. The battery management system according to claim 1, characterized in that, The output ends of the multiple baluns are located on the same side of the battery assembly.

3. The battery management system according to claim 1, characterized in that, The battery management unit includes a processing chip and a transceiver module communicatively connected to the processing chip, and the transceiver module is communicatively connected to the output end of the multi-in-one synthesizer.

4. The battery management system according to claim 1, characterized in that, The multiple battery cells are arranged in multiple rows, and each row of the battery cells is arranged side by side along the thickness direction of the battery cell; The length direction of the near-field coupling line is parallel to the side-by-side direction of each row of the battery cells, and each row of the battery cells is arranged between two of the near-field coupling lines, and the battery cell acquisition board is coupled to the relatively closer near-field coupling line.

5. The battery management system according to claim 4, characterized in that, Each of the battery cells has a positive electrode post and a negative electrode post, and the positive electrode post and the negative electrode post of the same battery cell are arranged oppositely in the length direction of the battery cell, and the battery cell acquisition board is integrated on the side of the battery cell where the negative electrode post is arranged; Each row of the battery cells includes a first side and a second side, the first side being arranged adjacent to one of the near-field coupling lines, and the second side being arranged adjacent to the other near-field coupling line; The positive electrode posts and the negative electrode posts on the first side or the second side of each row of the battery cells are arranged alternately, and the different electrode posts of two adjacent battery cells in the same row of the battery cells are conductively connected.

6. The battery management system according to claim 4, wherein, Each row of the battery cells includes a first side and a second side, the first side being arranged adjacent to one of the near-field coupling lines, and the second side being arranged adjacent to the other near-field coupling line; Among the multiple battery cell integration boards included in each row of the battery cells, there is at least one battery cell acquisition board located on the second side spaced between two adjacent battery cell acquisition boards located on the first side.

7. The battery management system according to claim 1, characterized in that, Each of the battery cell acquisition boards includes an acquisition chip and an antenna, the antenna being connected to the acquisition chip, and the antenna is coupled to the near-field coupling line to transmit signals.

8. The battery management system according to claim 1, wherein, The antenna of each of the battery cell acquisition boards is arranged adjacent to the near-field coupling line and maintains a predetermined coupling distance from the near-field coupling line.

9. The battery management system according to claim 8, wherein The coupling distance between the near-field coupling line and each of the battery cell acquisition boards is greater than 0 and less than or equal to 5 millimeters.

10. An electric vehicle, characterized in that, Including the battery management system according to any one of claims 1 to 9.

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