Battery management system and electric vehicle

Abstract

Provided in the present application are a battery management system and an electric vehicle. The battery management system comprises a battery, a wireless bridge chip and a main controller, wherein the battery comprises a plurality of battery cells, and a battery cell acquisition board is integrated onto each battery cell; the wireless bridge chip is in communication connection with the battery cell acquisition board on each battery cell by means of a near-field coupling line; and the main controller is connected to the wireless bridge chip by means of a communication line.

Description

Battery management system and electric vehicle Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202422008202.2, filed on August 16, 2024, with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to, but is not limited to, the technical field of batteries, and in particular to a battery management system and an electric vehicle. BACKGROUND

[0003] A battery management system (BMS) is a control system for protecting the safe use of a power battery. The battery management system can be used to monitor the use state of the battery at all times, thereby providing a guarantee for the safe use of an electric vehicle. SUMMARY

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] One aspect of the embodiments of the present application provides a battery management system. The battery management system includes a battery, a wireless bridge chip, and a master controller. The battery includes a plurality of battery cells, and each of the battery cells is integrated with a battery cell acquisition board. The wireless bridge chip is communicatively connected to the battery cell acquisition board of each of the battery cells through a near field coupling line. The master controller is connected to the wireless bridge chip through a communication line.

[0006] Further, the battery includes a plurality of battery cells arranged side by side along the thickness direction of the battery cells, and each of the battery cells has a first side and a second side opposite in the length direction of the battery cell. The plurality of battery cell acquisition boards are alternately and spacedly distributed on the first side and the second side of different battery cells, respectively.

[0007] Further, the near field coupling line is arranged adjacent to the front surface of each of the battery cell acquisition boards and maintains a predetermined coupling distance with the front surface of each of the battery cell acquisition boards.

[0008] Further, the predetermined coupling distance is less than 5 millimeters.

[0009] Further, the battery includes a first group of battery cells and a second group of battery cells arranged side by side along a length direction of the battery cells, each of the first group of battery cells and the second group of battery cells includes a plurality of battery cells arranged side by side along a thickness direction of the battery cells, the first side is an outer side of the battery, the second side is an inner side of the battery, and the near field coupling line is arranged along a path from an outer side of the first group of battery cells to an inner side and then from an inner side of the second group of battery cells to an outer side.

[0010] Further, the battery cell has a positive pole and a negative pole, the positive pole and the negative pole are arranged at the first side and the second side, and the positive pole and the negative pole are alternately arranged at the same side of different battery cells, the battery further includes a plurality of conductive connectors, different poles of adjacent two battery cells are connected through the conductive connectors, and the battery cell acquisition plate is arranged at the side where the negative pole is located.

[0011] Further, the battery cell acquisition plate has a first conductive sheet, a second conductive sheet, and a third conductive sheet, the first conductive sheet of the battery cell acquisition plate is connected to the positive pole, the second conductive sheet is connected to the negative pole, the third conductive sheet is connected to the positive pole of an adjacent battery cell, and a fuse wire is arranged on the battery cell acquisition plate, and two ends of the fuse wire are respectively connected to the second conductive sheet and the third conductive sheet.

[0012] Further, the battery cell further has a battery cell shell, the battery cell shell is short-circuited with the positive pole, and the first conductive sheet of the battery cell acquisition plate is connected to the battery cell shell and then to the positive pole.

[0013] Further, the battery cell acquisition plates of adjacent two battery cells in the plurality of battery cells are connected together as an electrical unit.

[0014] Another aspect of the embodiments of the present application provides an electric vehicle. The electric vehicle includes the battery management system as described above.

[0015] The battery management system and the electric vehicle of one or more embodiments of the present application can simplify the structure of the battery pack and reduce the use amount of connection cables and connectors by integrating the battery cell acquisition plate on each battery cell and realizing near field communication connection between the battery cell acquisition plate on each battery cell and the wireless bridge chip through the near field coupling line.

[0016] In addition, the battery management system and the electric vehicle of one or more embodiments of the present application are more stable, reliable, and secure in information by using the near field coupling communication mode.

[0017] Other aspects can become apparent after reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure.

[0019] FIG. 1 is a schematic diagram of a battery management system according to an embodiment of the present disclosure.

[0020] FIG. 2 is a schematic diagram of a battery management system according to another embodiment of the present disclosure.

[0021] FIG. 3 is a schematic diagram of a cell acquisition board located at a first side according to an embodiment of the present disclosure.

[0022] FIG. 4 is a schematic diagram of a cell acquisition board located at a second side according to an embodiment of the present disclosure.

[0023] FIG. 5 is a schematic diagram of a cell acquisition board according to another embodiment of the present disclosure.

[0024] FIG. 6 is a schematic diagram of a cell acquisition board according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to all alternative embodiments, as would be understood by persons skilled in the art. The following exemplary embodiments are described herein with reference to the figures. Unless specifically set forth herein, the

[0026] Currently, most battery management systems of electric vehicles usually need to use more cables and connectors, which increases the weight and volume of the battery.

[0027] The battery management system and electric vehicle of the present disclosure will be described in detail below with reference to the accompanying drawings. The features in the following embodiments and implementation manners can be combined with each other without conflict.

[0028] FIG. 1 discloses a schematic diagram of a battery management system 100 according to an embodiment of the present disclosure. As shown in FIG. 1, the battery management system 100 according to an embodiment of the present disclosure includes a battery 120, a wireless bridge chip 112 and a master controller 111. The wireless bridge chip 112 and the master controller 111 can be disposed on a master control board 110.

[0029] The battery 120 includes a plurality of battery cells 121. A battery cell acquisition board 122 is integrated on each battery cell 121. The battery cell acquisition board 122 on each battery cell 121 can acquire the voltage and temperature of the single battery cell. By integrating the battery cell acquisition board 122 on each battery cell 121, the electronic tagging management of each battery cell 121 can be realized. In addition, by integrating the battery cell acquisition board 122 on each battery cell 121, since the voltage of each battery cell 121 will not be too high, for example, less than 4.2V (volts), the problem of abnormally high voltage of the battery cell 121 caused by connection problems will not occur, so the safety is better.

[0030] The wireless bridge chip 112 is communicatively connected to the battery cell acquisition board 122 on each battery cell 121 through the near field coupling line 130. In an embodiment, the wireless bridge chip 112 can be communicatively connected to the battery cell acquisition board 122 on each battery cell 121 through one near field coupling line 130. In other embodiments, the wireless bridge chip 112 can also be communicatively connected to the battery cell acquisition board 122 on each battery cell 121 through multiple near field coupling lines 130, for example, one-to-one communication connection or one-to-many communication connection. The host controller 111 is connected to the wireless bridge chip 112 through a communication line. For example, the host controller 111 can be communicatively connected to the wireless bridge chip 112 through a communication line using the SPI (Serial Peripheral Interface) protocol.

[0031] The battery cell acquisition board 122 on each battery cell 121 is provided with an acquisition chip and an antenna (not shown), and the antenna is connected to the acquisition chip. The acquisition chip on the battery cell acquisition board 122 of the present application uses near field radio frequency communication technology (NFC, Near Field Communication), so that the anti-interference performance is stronger, the reliability of the data is enhanced, thereby having better safety, robustness, interference resistance, etc. At the same time, the transmission power of the near field radio frequency is lower, which can better reduce the energy consumption.

[0032] The battery management system 100 of the present application can reduce the use amount of connection cables and connectors by integrating the battery cell acquisition board 122 on each battery cell 121, and the battery cell acquisition board 122 on each battery cell 121 is communicatively connected to the wireless bridge chip 112 through the near field coupling line 130, which can further simplify the structure of the battery pack.

[0033] Moreover, the battery management system 100 of the present application uses the near field coupling communication mode, which is more stable, reliable, and has better information security.

[0034] As shown in FIG. 1, the battery 120 includes a plurality of battery cells 121 arranged side by side along a cell thickness direction D1, the battery cells 121 having a first side 1211 and a second side 1212 opposite in a cell length direction D2, and a plurality of cell collection plates 122 alternately and spacedly arranged on the first side 1211 and the second side 1212 of different battery cells 121, respectively. For example, the cell collection plates 122 are arranged on the first side 1211 of the 1st, 3rd, 5th, 7th,... battery cells 121, and on the second side 1212 of the 2nd, 4th, 6th, 8th,... battery cells 121.

[0035] The near field coupling line 130 is arranged adjacent to and maintains a predetermined coupling distance from the front side (e.g., outward-facing side) of each cell collection plate 122. For example, a retaining member can be arranged on each battery cell 121, and the near field coupling line 130 can be arranged on the retaining member of each battery cell 121, so as to ensure that the front side of each cell collection plate 122 maintains a predetermined coupling distance from the near field coupling line 130. Alternatively, the coupling distance between the near field coupling line 130 and each cell collection plate 122 is less than 5 mm.

[0036] FIG. 2 discloses a schematic diagram of a battery management system 100 according to another embodiment of the present application. As shown in FIG. 2, in some embodiments, the battery 120 includes a first group of battery cells 1201 and a second group of battery cells 1202 arranged side by side along a cell length direction D2, each of the first group of battery cells 1201 and the second group of battery cells 1202 including a plurality of battery cells 121 arranged side by side along a cell thickness direction D1.

[0037] In one embodiment, the near field coupling line 130 can be arranged along a path from the outer side of the first group of battery cells 1201 to the inner side, and then from the inner side of the second group of battery cells 1202 to the outer side. For example, in FIG. 2, the near field coupling line 130 connecting the wireless bridge chip 112 can extend from one end of the outer side of the first group of battery cells 1201 to the other end along the cell thickness direction D1, and then from the other end to one end of the inner side of the first group of battery cells 1201 along the cell length direction D2, and then continue to extend from the one end of the inner side of the first group of battery cells 1201 to the other end along the cell thickness direction D1, and then from the other end to one end of the inner side of the second group of battery cells 1202 along the cell length direction D2, and then continue to extend from the one end of the inner side of the second group of battery cells 1202 to the other end along the cell thickness direction D1, and then from the other end to one end of the outer side of the second group of battery cells 1202 along the cell length direction D2, and then continue to extend from the one end of the outer side of the second group of battery cells 1202 to the other end along the cell thickness direction D1.

[0038] In some embodiments, the near field coupling line 130 can include a differential pair of lines, which can be connected by a resistance (not shown) at the ends distal from the wireless bridge chip 112.

[0039] Continuing to refer to FIG. 1, the electric core 121 has a positive pole and a negative pole. The positive pole and the negative pole are arranged on the first side 1211 and the second side 1212, and the positive pole and the negative pole are alternately arranged on the same side of different electric cores 121, that is, the adjacent two electric cores 121 on the same side have different polarities.

[0040] The battery 120 further includes a plurality of conductive connecting pieces 140 (as shown in FIGS. 3 and 4), which are connected between different poles of adjacent two electric cores 121, so that the plurality of electric cores 121 can be connected in series with each other through the plurality of conductive connecting pieces 140.

[0041] In some embodiments, the electric core collecting plate 122 can be arranged on the side where the negative pole is located.

[0042] FIG. 3 discloses a schematic diagram of the electric core collecting plate 122 located on the first side 1211 according to an embodiment of the present application, and FIG. 4 discloses a schematic diagram of the electric core collecting plate 122 located on the second side 1212 according to an embodiment of the present application. As shown in FIGS. 3 and 4, the electric core collecting plate 122 has a first conductive sheet 1221, a second conductive sheet 1222, and a third conductive sheet 1223. In an embodiment, the first conductive sheet 1221, the second conductive sheet 1222, and the third conductive sheet 1223 on the electric core collecting plate 122 can each be a nickel sheet, for example. The nickel sheet has ferromagnetism and good plasticity, and also has good corrosion resistance. Of course, it can be understood that the first conductive sheet 1221, the second conductive sheet 1222, and the third conductive sheet 1223 on the electric core collecting plate 122 of the present application are not limited to a nickel sheet. In other embodiments, the first conductive sheet 1221, the second conductive sheet 1222, and the third conductive sheet 1223 on the electric core collecting plate 122 of the present application can also be made of other conductive materials as long as they can play a conductive role.

[0043] The first conductive sheet 1221 of the electric core collecting plate 122 is connected to the positive pole, the second conductive sheet 1222 is connected to the negative pole, and the third conductive sheet 1223 is connected to the positive pole of the adjacent electric core 121. A fuse wire 1224 is arranged on the electric core collecting plate 122, and the two ends of the fuse wire 1224 are respectively connected to the second conductive sheet 1222 and the third conductive sheet 1223. Thus, when a short circuit occurs between the positive pole and the negative pole of the electric core 121, the positive pole and the negative pole of the electric core 121 can be disconnected by fusing the fuse wire 1224.

[0044] The battery management system 100 of the present application cancels the need for the battery management system 100 of the related art to be connected through FPC (Flexible Printed Circuit) connecting lines and connectors by directly arranging the fuse wires 1224 for preventing short circuit between the positive and negative poles of the battery cell 121 on the battery cell collecting plate 122, thereby simplifying the structure and reducing the cost.

[0045] The battery cell 121 also has a battery cell shell 1210 (as shown in FIGS. 3 and 4). In the case where the battery cell collecting plate 122 is arranged on the side where the negative pole post is located, the battery cell shell 1210 of the battery cell 121 can be short-circuited with the positive pole post, and the first conductive sheet 1221 of the battery cell collecting plate 122 can be connected to the battery cell shell 1210, thereby being connected to the positive pole post through the battery cell shell 1210.

[0046] As shown in FIGS. 3 and 4, since the battery cell collecting plates 122 located on the first side 1211 and the second side 1212 are respectively distributed on the adjacent battery cells 121 in a staggered manner, the third conductive sheets 1223 of the battery cell collecting plates 122 located on the first side 1211 and the second side 1212 are respectively located on different side edges of the battery cell collecting plates 122. For example, for the third conductive sheet 1223 on the battery cell collecting plate 122 on the outer side shown in FIG. 3, it is located on the left side of the battery cell collecting plate 122, and for the third conductive sheet 1223 on the battery cell collecting plate 122 on the inner side shown in FIG. 4, it is located on the right side of the battery cell collecting plate 122.

[0047] Figure 5 discloses a schematic diagram of the cell collection plate 122 according to an embodiment of the present application. As shown in Figure 5, in order to make the cell collection plate 122 suitable for installation on both the outer side and the inner side of the cell 121, a third conductive sheet 1223 can be provided on both the left and right sides of the cell collection plate 122. The fuse wire 1224 can also be provided on both the left and right sides, so that the third conductive sheet 1223 on one side of the cell collection plate 122 can be connected to the positive pole of the adjacent cell 121 according to the actual installation position. For example, with reference to Figure 3, when the cell collection plate 122 is installed on the outer side of the cell 121, the third conductive sheet 1223 on the left side can be connected to the left adjacent cell 121, and the third conductive sheet 1223 on the right side is not used. With reference to Figure 4, when the cell collection plate 122 is installed on the inner side of the cell 121, the third conductive sheet 1223 on the right side can be used to connect the third conductive sheet 1223 on the right side to the right adjacent cell 121, and the third conductive sheet 1223 on the left side is not used. Thus, the cell collection plate 122 has better applicability and uniformity, so that the structure can be further simplified and the product cost can be reduced. In some embodiments, for the last section of the cell, the first conductive sheet 1221 and the second conductive sheet 1222 are provided on the upper and lower sides of the cell collection plate 122, and the third conductive sheet is not provided on the left and right sides. In some embodiments, for the last section of the cell, the fuse wire can not be provided. In some embodiments, for the first negative pole, in addition to the first conductive sheet 1221, the second conductive sheet 1222, and the third conductive sheet 1223 on the left and right sides, the cell collection plate 122 also includes a fourth conductive sheet 1225 below one of the third conductive sheets, as shown in Figure 6.

[0048] The battery management system 100 of the present application has at least the following beneficial technical effects: simple structure, lower static power consumption, higher voltage collection accuracy; stable and reliable wireless communication signal, higher safety.

[0049] In other embodiments, according to the voltage resistance of the collection chip on the cell collection plate 122, the cell collection plate 122 can also be implemented in a 1-to-2 form, i.e., the cell collection plates 122 of two adjacent cells 121 in the plurality of cells 121 are connected together as an electrical unit, so that the purpose of reducing the use of cables and connectors and simplifying the battery structure can also be achieved similarly.

[0050] In yet some embodiments, the battery management system 100 of the present application can also be implemented in a 1-to-16 form, i.e., on the basis of connecting the battery management system 100 of the present application with the battery management system 100 of the present application in a 1-to-2 form as an electrical unit, eight 1-to-2 forms of the battery management system 100 of the present application can be further connected together on a whole circuit board, thereby forming a 1-to-16 form, and the purposes of reducing the use of cables and connectors and simplifying the structure of the battery can also be achieved similarly.

[0051] It can be understood that the above description is only some embodiments of the battery management system 100 of the present application, and some structures of the battery management system 100 of the present application can be changed equivalently or similarly without departing from the essence of the present application, which shall be covered in the protection scope defined by the claims attached herewith.

[0052] The present application also provides an electric vehicle. The electric vehicle comprises the battery management system 100 described above.

[0053] The electric vehicle of the present application can have similar beneficial technical effects as the battery management system 100 described above, and thus will not be described here again.

[0054] The battery management system and the electric vehicle provided by the embodiments of the present application are described in detail above. The battery management system and the electric vehicle of the embodiments of the present application are described by applying specific examples in this paper, and the above embodiments are only used to help understand the core idea of the present application, and are not used to limit the present application. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the spirit and principles of the present application, and these improvements and modifications shall also fall within the protection scope of the claims attached herewith.

Claims

1. A battery management system, comprising: a battery (120) comprising a plurality of battery cells (121), each of which is integrated with a cell acquisition board (122); a wireless bridge chip (112) in communication connection with the cell acquisition board (122) on each of the battery cells (121) through a near field coupling line (130); a master controller (111) connected with the wireless bridge chip (112) through a communication line.

2. The battery management system of claim 1, wherein, The battery (120) comprises a plurality of battery cells (121) arranged side by side along a battery cell thickness direction (D1), each of which has a first side (1211) and a second side (1212) opposite in a battery cell length direction (D2), and a plurality of cell acquisition boards (122) are alternately and spacedly arranged on the first side and the second side of different battery cells.

3. The battery management system of claim 2, wherein, The near field coupling line (130) is arranged adjacent to the front surface of each of the cell acquisition boards (122) and maintains a predetermined coupling distance with the front surface of each of the cell acquisition boards (122).

4. The battery management system of claim 3, wherein, The predetermined coupling distance is less than 5 mm.

5. The battery management system of claim 3 or 4, wherein, The battery (120) comprises a first group of battery cells (1201) and a second group of battery cells (1202) arranged side by side along the battery cell length direction (D2), each of the first group of battery cells (1201) and the second group of battery cells (1202) comprises a plurality of battery cells (121) arranged side by side along the battery cell thickness direction (D1), the first side (1211) is the outer side of the battery, the second side (1212) is the inner side of the battery, and the near field coupling line (130) is arranged along a path from the outer side to the inner side of the first group of battery cells (1201) and from the inner side to the outer side of the second group of battery cells (1202).

6. The battery management system of any one of claims 2 to 5, wherein, The battery cell (121) has a positive pole and a negative pole, the positive pole and the negative pole are arranged on the first side (1211) and the second side (1212), and the positive pole and the negative pole are alternately arranged on the same side of different battery cells, the battery (120) further comprises a plurality of conductive connecting pieces (140), the different poles of adjacent two battery cells (121) are connected through the conductive connecting pieces, and the cell acquisition board (122) is arranged on the side where the negative pole is located.

7. The battery management system of claim 6, wherein, The cell acquisition board (122) has a first conductive sheet (1221), a second conductive sheet (1222) and a third conductive sheet (1223), the first conductive sheet (1221) of the cell acquisition board (122) is connected to the positive pole, the second conductive sheet (1222) is connected to the negative pole, and the third conductive sheet (1223) is connected to the positive pole of the adjacent battery cell, a fuse trace (1224) is arranged on the cell acquisition board (122), and two ends of the fuse trace are connected to the second conductive sheet (1222) and the third conductive sheet (1223), respectively.

8. The battery management system of claim 7, wherein, The electric core (121) also has an electric core shell (1210) which is short-circuited with the positive pole column, and the first conductive sheet (1221) of the electric core collecting plate (122) is connected to the electric core shell (1210) and then connected to the positive pole column.

9. The battery management system of claim 1, wherein, The electric core collecting plates of two adjacent electric cores in the plurality of electric cores are connected together as an electrical unit. 10.An electric vehicle comprising the battery management system according to any one of claims 1 to 9.

Images