Battery management system and electric vehicle

Abstract

The utility model provides a battery management system and an electric vehicle. The battery management system comprises a battery, a wireless bridging chip and a master controller. The battery comprises a plurality of battery cells, and a battery cell acquisition board is integrated on each battery cell. And the wireless bridging chip is in communication connection with the battery cell acquisition board on each battery cell through a near-field coupling line. The master controller is connected with the wireless bridging chip through a communication line. The battery structure can be simplified, and the use of cables and connectors can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery management system and an electric vehicle. Background Art

[0002] The battery management system (BMS) is a control system that protects the safety of power batteries. The battery management system can be used to monitor the battery status at all times and provide protection for the safety of electric vehicles. At present, the structure of the battery management system of most electric vehicles usually requires the use of more cables and connectors, which increases the weight and volume of the battery. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery management system and an electric vehicle, which can simplify the battery structure and reduce the use of cables and connectors.

[0004] One aspect of an embodiment of the present application provides a battery management system. The battery management system includes a battery, a wireless bridge chip and a main controller. The battery includes a plurality of cells, and a cell acquisition board is integrated on each of the cells. The wireless bridge chip is connected to the cell acquisition board on each of the cells through a near-field coupling line. The main controller is connected to the wireless bridge chip through a communication line.

[0005] Furthermore, the battery comprises a plurality of cells arranged side by side along the cell thickness direction, the cell having a first side and a second side opposite to each other in the cell length direction, and a plurality of cell collection plates are alternately distributed on different cells on the first side and the second side.

[0006] Furthermore, the near-field coupling line is arranged adjacent to the front side of each of the battery cell collection boards and maintains a predetermined coupling distance with the front side of each of the battery cell collection boards.

[0007] Furthermore, the coupling distance between the near-field coupling line and each of the battery cell collection boards is less than 5 mm.

[0008] Furthermore, the battery includes a first group of battery cells and a second group of battery cells arranged side by side along the width direction of the battery cells, each group of battery cells in the first group of battery cells and the second group of battery cells includes a plurality of battery cells arranged side by side along the thickness direction of the battery cells, the first side is the outside of the battery, the second side is the inside of the battery, and the near-field coupling line is arranged along a direction from the outside of the first group of battery cells to the inside and then from the inside to the outside of the second group of battery cells.

[0009] Furthermore, the battery cell has a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are arranged on the first side and the second side, and the positive electrode column and the negative electrode column are alternately arranged on different battery cells on the same side. The battery also includes a plurality of conductive connectors, and the different electrodes of two adjacent battery cells are connected by the conductive connectors. The battery cell collection board is arranged on the side where the negative electrode column is located.

[0010] Furthermore, the battery cell collection board has a first conductive sheet, a second conductive sheet and a third conductive sheet, the first conductive sheet of the battery cell collection board is connected to the positive electrode column, the second conductive sheet is connected to the negative electrode column, and the third conductive sheet is connected to the positive electrode column of an adjacent battery cell, and a fuse trace is provided on the battery cell collection board, and two ends of the fuse trace are respectively connected to the second conductive sheet and the third conductive sheet.

[0011] Furthermore, the battery cell also has a battery cell shell, the battery cell shell is short-circuited with the positive electrode column, and the first conductive sheet of the battery cell collection board is connected to the battery cell shell and further connected to the positive electrode column.

[0012] Furthermore, the cell collection boards of two adjacent cells among the plurality of cells are connected together as an electrical unit.

[0013] Another aspect of the embodiments of the present application provides an electric vehicle, wherein the electric vehicle comprises the battery management system as described above.

[0014] The battery management system and electric vehicle of one or more embodiments of the present application integrate a battery collection board on each battery cell, and the battery collection board on each battery cell realizes near-field communication connection with the wireless bridge chip through a near-field coupling line, thereby simplifying the structure of the battery pack and reducing the use of connecting cables and connectors.

[0015] In addition, the battery management system and electric vehicle of one or more embodiments of the present application adopt near-field coupling communication, which is more stable, reliable, and has better information security. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a battery management system according to an embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of a battery management system according to another embodiment of the present application.

[0018] Figure 3 This is a schematic diagram of a battery cell collection board located on the first side according to an embodiment of the present application.

[0019] Figure 4 This is a schematic diagram of a battery cell collection board located on the second side according to an embodiment of the present application.

[0020] Figure 5 This is a schematic diagram of a battery cell collection board according to another embodiment of the present application. DETAILED DESCRIPTION

[0021] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying 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. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0022] The battery management system and electric vehicle of the present application will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0023] Figure 1 A schematic diagram of a battery management system 100 according to an embodiment of the present application is disclosed. Figure 1 As shown, a battery management system 100 according to an embodiment of the present application includes a battery 120 , a wireless bridge chip 112 , and a main controller 111 . The wireless bridge chip 112 and the main controller 111 may be disposed on a main control board 110 .

[0024] The battery 120 includes a plurality of battery cells 121. A battery cell collection board 122 is integrated on each battery cell 121. The battery cell collection board 122 on each battery cell 121 can collect the voltage and temperature of a single battery cell. By integrating the battery cell collection board 122 on each battery cell 121, electronic label management of each battery cell 121 can be achieved. In addition, since the battery cell collection board 122 is integrated on each battery cell 121, the voltage of each battery cell 121 will not be too high, for example, less than 4.2V (volts), therefore, there will be no problem of abnormally high voltage of the battery cell 121 due to connection problems, so the safety is better.

[0025] The wireless bridge chip 112 is connected to the battery cell collection board 122 on each battery cell 121 through a near-field coupling line 130. In a preferred embodiment, the wireless bridge chip 112 can be connected to the battery cell collection board 122 on each battery cell 121 through a near-field coupling line 130. The use of a near-field coupling line 130 can greatly simplify the design and layout of the battery, reduce the number and complexity of components, and reduce manufacturing costs; in addition, due to fewer components, battery maintenance is relatively simple, and troubleshooting and replacement of components are also more convenient. Of course, the present application is not limited to using a near-field coupling line 130 to achieve the communication connection between the wireless bridge chip 112 and the battery cell collection board 122 on each battery cell 121. In other embodiments, the wireless bridge chip 112 can also be connected to the battery cell collection board 122 on each battery cell 121 through multiple near-field coupling lines 130, thereby improving the transmission efficiency, but the structural complexity and cost will be increased accordingly. The main controller 111 is connected to the wireless bridge chip 112 through a communication line. For example, the main controller 111 may be connected to the wireless bridge chip 112 via a communication line using a SPI (Serial Peripheral Interface) protocol.

[0026] Each battery cell acquisition board 122 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 adopts near field radio frequency communication technology (NFC, Near Field Communication), so that it has stronger anti-interference ability and enhanced data reliability, thus having better security, robustness, and interference resistance. At the same time, the transmission power of the near field radio frequency is low, which can better reduce energy consumption.

[0027] The battery management system 100 of the present application integrates a battery collection board 122 on each battery cell 121, and the battery collection board 122 on each battery cell 121 realizes near-field communication connection with the wireless bridge chip 112 through a near-field coupling line 130, so that the existing wired communication of the battery 120 can be changed to near-field wireless communication, thereby reducing the use of connecting cables and connectors, and further simplifying the structure of the battery pack.

[0028] Moreover, the battery management system 100 of the present application adopts a near-field coupling communication method, which is more stable, reliable, and has better information security.

[0029] like Figure 1 As shown, the battery 120 includes a plurality of battery cells 121 arranged side by side along the battery cell thickness direction D1, the battery cell 121 has a first side 1211 and a second side 1212 opposite to each other in the battery cell length direction D2, and a plurality of battery cell collection plates 122 are alternately distributed on different battery cells 121 on the first side 1211 and the second side 1212.

[0030] The near-field coupling line 130 is disposed adjacent to the front of each battery cell collection board 122 and maintains a predetermined coupling distance with the front of each battery cell collection board 122. For example, a holder may be disposed on each battery cell 121, and the near-field coupling line 130 may be located on the holder of each battery cell 121, thereby ensuring that a predetermined coupling distance is maintained between the front of each battery cell collection board 122 and the near-field coupling line 130. Optionally, the coupling distance between the near-field coupling line 130 and each battery cell collection board 122 is less than 5 mm.

[0031] Figure 2 A schematic diagram of a battery management system 100 according to another embodiment of the present application is disclosed. Figure 2 As shown, 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 the battery cell width direction D3, and each group of battery cells in the first group of battery cells 1201 and the second group of battery cells 1202 includes a plurality of battery cells 121 arranged side by side along the battery cell thickness direction D1.

[0032] The first side 1211 is the outer side of the battery 120, and the second side 1212 is the inner side of the battery 120. In one embodiment, the near-field coupling line 130 may be arranged along a direction 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. Figure 2 In the embodiment, 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 battery cell thickness direction D1, and then go around from the other end along the battery cell width direction D3 to one end of the inner side of the first group of battery cells 1201, and continue to extend from this end of the inner side of the first group of battery cells 1201 to the other end along the battery cell thickness direction D1, and then go around from the other end along the battery cell width direction D3 to one end of the inner side of the second group of battery cells 1202, and then continue to extend from this end of the inner side of the second group of battery cells 1202 to the other end along the battery cell thickness direction D1, and then go around from the other end along the battery cell width direction D3 to one end of the outer side of the second group of battery cells 1202, and continue to extend from this end of the outer side of the second group of battery cells 1202 to the other end along the battery cell thickness direction D1.

[0033] In some embodiments, the near-field coupling line 130 may include a differential line pair, and ends of the differential line pair away from the wireless bridge chip 112 may be connected via a resistor (not shown).

[0034] Continue to refer to Figure 1As shown, the battery cell 121 has a positive electrode column and a negative electrode column. The positive electrode column and the negative electrode column are arranged on the first side 1211 and the second side 1212, and the positive electrode column and the negative electrode column are alternately arranged on different battery cells 121 on the same side, that is, two adjacent battery cells 121 on the same side have different polarities.

[0035] The battery 120 also includes a plurality of conductive connectors 140 (eg Figure 3 and Figure 4 As shown), different poles of two adjacent battery cells 121 are connected by a conductive connector 140, so that multiple battery cells 121 can be connected in series through multiple conductive connectors 140.

[0036] In some embodiments, the cell collection board 122 may be disposed on the side where the negative electrode column is located.

[0037] Figure 3 A schematic diagram of a cell collection board 122 located on a first side 1211 according to an embodiment of the present application is disclosed. Figure 4 A schematic diagram of a cell collection board 122 located at the second side 1212 of an embodiment of the present application is disclosed. Figure 3 and Figure 4 As shown, the battery cell collection board 122 has a first conductive sheet 1221, a second conductive sheet 1222 and a third conductive sheet 1223. In one embodiment, the first conductive sheet 1221, the second conductive sheet 1222 and the third conductive sheet 1223 on the battery cell collection board 122 can be made of nickel sheets, for example. Nickel sheets have ferromagnetism and good plasticity, and also have 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 battery cell collection board 122 of the present application are not limited to nickel sheets. In other embodiments, the first conductive sheet 1221, the second conductive sheet 1222 and the third conductive sheet 1223 on the battery cell collection board 122 of the present application can also be made of other conductive materials, as long as they can play a conductive role.

[0038] The first conductive sheet 1221 of the cell collection 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 cell 121. A fuse trace 1224 is provided on the cell collection board 122, and the two ends of the fuse trace 1224 are respectively connected to the second conductive sheet 1222 and the third conductive sheet 1223. Therefore, when a short circuit occurs between the positive and negative poles of the cell 121, the positive and negative poles of the cell 121 can be disconnected by fusing the fuse trace 1224.

[0039] The battery management system 100 of the present application directly sets a fuse trace 1224 on the battery cell collection board 122 for preventing a short circuit between the positive and negative electrodes of the battery cell 121, thereby eliminating the need for the existing battery management system 100 to be connected through FPC (Flexible Printed Circuit) connecting wires and connectors, thereby simplifying the structure and reducing costs.

[0040] The battery cell 121 also has a battery cell housing 1210 (eg Figure 3 and Figure 4 When the cell collection board 122 is disposed on the side where the negative pole is located, the cell housing 1210 of the cell 121 can be short-circuited with the positive pole, and the first conductive sheet 1221 of the cell collection board 122 can be connected to the cell housing 1210, and then connected to the positive pole by means of the cell housing 1210.

[0041] like Figure 3 and Figure 4 As shown, since the cell collection board 122 located on the first side 1211 and the cell collection board 122 located on the second side 1212 are staggered and distributed on adjacent cells 121, the third conductive sheet 1223 of the telecommunication collection board located on the first side 1211 and the third conductive sheet 1223 located on the second side 1212 are located on different sides of the cell collection board 122. For example, Figure 3 The third conductive sheet 1223 on the outer side of the battery cell collection board 122 is located on the left side of the battery cell collection board 122. Figure 4 The third conductive sheet 1223 on the inner side of the battery cell collection board 122 is located on the right side of the battery cell collection board 122 .

[0042] Figure 5 The schematic diagram of the battery cell collection board 122 of one embodiment of the present application is disclosed. Figure 5 As shown, in order to make the cell collection board 122 suitable for installation on both the outer cell 121 and the inner cell 121, the third conductive sheet 1223 can be provided on both the left and right sides of the cell collection board 122. The fuse trace 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 board 122 can be connected to the positive pole of the adjacent cell 121 according to the actual installation position. For example, in combination with reference Figure 3 When the cell collection board 122 is located on the outer cell 121, the third conductive sheet 1223 on the left can be connected to the adjacent cell 121 on the left, while the third conductive sheet 1223 on the right is not used; Figure 4When the cell collection board 122 is located on the inner cell 121, the third conductive sheet 1223 on the right can be used to connect the third conductive sheet 1223 on the right to the adjacent cell 121 on the right, while the third conductive sheet 1223 on the left is not used. Thus, the cell collection board 122 can have better applicability and uniformity, thereby further simplifying the structure and reducing product costs.

[0043] The battery management system 100 of the present application has at least the following beneficial technical effects: simple structure implementation, lower static power consumption, higher voltage acquisition accuracy; stable and reliable wireless communication signals, and higher security.

[0044] In other embodiments, according to the voltage resistance of the collection chip on the battery cell collection board 122, the battery cell collection board 122 can also be implemented in a 1-to-2 form, that is, the battery cell collection boards 122 of two adjacent battery cells 121 among the multiple battery cells 121 are made together as an electrical unit, thereby, the above-mentioned purpose of reducing the use of cables and connectors and simplifying the battery structure can be similarly achieved.

[0045] In some other embodiments, the battery cell collection board 122 of the present application can also be implemented in the form of 1 to 16, that is, the battery management system 100 of the present application can further combine the battery cell collection boards 122 of two adjacent battery cells 121 as an electrical unit, and can further combine eight 1 to 2 collection boards on a whole circuit board to form a 1 to 16 form, and can also similarly achieve the above-mentioned purpose of reducing the use of cables and connectors and simplifying the battery structure.

[0046] It can be understood that the above descriptions are only some embodiments of the battery management system 100 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 subjected to equivalent or similar transformations, which will all be covered within the scope of protection defined by the claims attached to the present application.

[0047] The present application also provides an electric vehicle, which includes the battery management system 100 described above.

[0048] The electric vehicle of the present application may have similar beneficial technical effects as the battery management system 100 described above, so they will not be described in detail here.

[0049] The battery management system and electric vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the battery management system and electric vehicle in 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 ordinary technicians in this technical field, without departing from the spirit and principles 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 scope of protection of the claims attached to the present application.

Claims

1. A battery management system, characterized in that: include: A battery, comprising a plurality of cells, each of which is integrated with a cell collection board; A wireless bridge chip, wherein the wireless bridge chip is communicatively connected to the battery cell acquisition board on each battery cell through a near-field coupling line; A main controller is connected to the wireless bridge chip via a communication line.

2. The battery management system according to claim 1, characterized in that: The battery comprises a plurality of cells arranged side by side along the thickness direction of the cells, the cells having a first side and a second side opposite to each other in the length direction of the cells, and a plurality of cell collection plates are alternately distributed on different cells on the first side and the second side.

3. The battery management system according to claim 2, characterized in that: The near-field coupling line is arranged adjacent to the front side of each of the battery cell collection boards and maintains a predetermined coupling distance with the front side of each of the battery cell collection boards.

4. The battery management system according to claim 3, characterized in that: The coupling distance between the near-field coupling line and each of the battery cell collection boards is less than 5 mm.

5. The battery management system according to claim 3, characterized in that: The battery includes a first group of battery cells and a second group of battery cells arranged side by side along the width direction of the battery cells, each group of battery cells in the first group of battery cells and the second group of battery cells includes a plurality of battery cells arranged side by side along the thickness direction of the battery cells, the first side is the outer side of the battery, the second side is the inner side of the battery, and the near-field coupling line is arranged along a direction from the outer side of the first group of battery cells to the inner side and then from the inner side of the second group of battery cells to the outer side.

6. The battery management system according to claim 2, characterized in that: The battery cell has a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are arranged on the first side and the second side, and the positive electrode column and the negative electrode column are alternately arranged on different battery cells on the same side. The battery also includes a plurality of conductive connectors, and different electrodes of two adjacent battery cells are connected by the conductive connectors. The battery cell collection board is arranged on the side where the negative electrode column is located.

7. The battery management system according to claim 6, characterized in that: The battery cell collection board has a first conductive sheet, a second conductive sheet and a third conductive sheet. The first conductive sheet of the battery cell collection board is connected to the positive electrode column, the second conductive sheet is connected to the negative electrode column, and the third conductive sheet is connected to the positive electrode column of the adjacent battery cell. A fuse trace is provided on the battery cell collection board, and two ends of the fuse trace are respectively connected to the second conductive sheet and the third conductive sheet.

8. The battery management system according to claim 7, characterized in that: The battery cell also 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 collection board is connected to the battery cell shell and further connected to the positive pole.

9. The battery management system according to claim 1, characterized in that: The cell collection boards of two adjacent cells among the plurality of cells are connected together as an electrical unit.

10. An electric vehicle, characterized in that: The invention comprises a battery management system as claimed in any one of claims 1 to 9.

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