Battery Management System, Battery Pack, and Vehicle

Abstract

The present application discloses a battery management system, a battery pack and a vehicle, belonging to the technical field of battery manufacturing. The battery management system is applied to a series-connected battery pack. The battery pack includes a plurality of series-connected battery modules, and each battery module includes a plurality of series-connected battery cells. The battery management system includes: The battery management system daughter board includes multiple groups of analog front ends. The multiple groups of analog front ends of the same battery management system daughter board are used to correspondingly connect to a plurality of battery modules one by one to sample the voltage of the battery cells. The multiple battery modules corresponding to at least one battery management system daughter board are non-adjacent in the series circuit; The multiple battery management system daughter boards are electrically connected to the battery management system main board. Through the above settings of the multiple battery management system daughter boards and the battery management system main board, combined with the non-adjacent sampling idea, the layout constraint of the battery management system daughter board and the wiring harness layout constraint from the battery management system daughter board to the battery module are liberated, and the manufacturing cost of the battery management system is saved.

Description

Technical Field

[0001] This application belongs to the technical field of battery manufacturing, and particularly relates to a battery management system, a battery pack, and a vehicle. Background Art

[0002] A battery management system (BMS, Battery Management Systerm) has the function of monitoring the voltage of the battery cells in a battery pack. For a series-connected battery pack used in a small vehicle, generally, daisy-chain communication is adopted to realize the voltage sampling of each battery cell. In this sampling and communication method, multiple battery management system daughter boards (BMU, Battery Module Unit) generally collect the voltages of the battery cells in each series-connected module in sequence according to the series circuit order of the modules in the battery pack.

[0003] Limited by the spatial layout of multiple modules in the battery pack, the wire harness length between each battery management system daughter board and the corresponding module will be very long. In order to reduce the wire harness length at this place, in the related art, it is usually necessary to adjust the spatial layout of multiple battery management system daughter boards, so that multiple battery management system daughter boards cannot be arranged in the overall daisy-chain order, which is prone to misconnection during assembly, and this method generally can only shorten the wire harness length between some battery management system daughter boards and the corresponding modules, and has limited effect on the overall wiring length. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a battery management system, a battery pack, and a vehicle, which liberates the arrangement constraint of the sampling wire harness and saves the manufacturing cost of the battery management system.

[0005] In a first aspect, this application provides a battery management system, which is applied to a series-connected battery pack. The battery pack includes multiple series-connected battery modules, and the battery module includes multiple series-connected battery cells. The battery management system includes:

[0006] Multiple battery management system daughter boards, each battery management system daughter board includes multiple groups of analog front ends. The multiple groups of analog front ends of the same battery management system daughter board are used to connect multiple battery modules one by one to sample the voltage of the battery cells, and the multiple battery modules corresponding to at least one battery management system daughter board are non-adjacent in the series circuit;

[0007] A battery management system main board, and the multiple battery management system daughter boards are electrically connected to the battery management system main board.

[0008] According to the battery management system of the present application, through the settings of the above-mentioned multiple battery management system daughter boards and the battery management system main board, combined with the integration of multiple analog front ends and the non-adjacent sampling idea, on the one hand, it liberates the layout constraints of the multiple battery management system daughter boards and the wiring harness layout constraints from the battery management system daughter boards to the battery modules; on the other hand, it reduces the situation of wiring harness detours, thereby reducing the demand of the battery management system for the wiring harness, and thus saving the manufacturing cost of the battery management system; on the third hand, it realizes the sequential connection of multiple battery management system daughter boards in a closed loop, which is convenient for assembly.

[0009] According to an embodiment of the present application, the battery management system daughter board is electrically connected to multiple battery modules adjacent to itself in spatial layout.

[0010] According to an embodiment of the present application, the multiple series-connected battery modules are arranged in multiple columns in spatial layout, the battery modules in the same column are connected in series, and the last battery module in adjacent columns of battery modules is connected in series;

[0011] The multiple battery management system daughter boards are arranged along the direction of the columns of the battery modules, and multiple groups of analog front ends of the same battery management system daughter board are respectively used to electrically connect multiple battery modules in different columns.

[0012] According to an embodiment of the present application, the multiple battery management system daughter boards are electrically connected to the battery management system main board through daisy chain communication lines.

[0013] According to an embodiment of the present application, the multiple series-connected battery modules are arranged in multiple rows in spatial layout, each battery management system daughter board is arranged between multiple battery modules in the same row, and multiple groups of analog front ends of the same battery management system daughter board are respectively used to electrically connect multiple battery modules in the same row.

[0014] According to an embodiment of the present application, the multiple series-connected battery modules are arranged in multiple arrays in spatial layout, the battery modules in the same column are connected in series, and the last battery module in adjacent columns of battery modules is connected in series;

[0015] The multiple battery management system daughter boards are arranged along the direction of the columns of the battery modules, and each battery management system daughter board is arranged between multiple battery modules in the same row, and multiple groups of analog front ends of the same battery management system daughter board are respectively used to electrically connect multiple battery modules in different columns in the same row.

[0016] On the second hand, the present application also provides a battery pack, which includes:

[0017] Multiple series-connected battery modules, and the battery module includes multiple series-connected battery cells;

[0018] Any one of the above-mentioned battery management systems.

[0019] For the battery pack according to the present application, through the arrangement of multiple series-connected battery modules and the above-mentioned battery management system, on the one hand, effective implementation of battery cell balancing management, reliable insulation monitoring and safety monitoring of the battery pack, real-time sending of fault diagnosis information, and realization of reliable and safe management of the battery system; on the other hand, intelligent management and maintenance of each battery unit, prevention of overcharging and over-discharging of the battery, effective control and safety monitoring of the fast charging and slow charging processes of the power battery, thereby prolonging the service life of the battery.

[0020] According to an embodiment of the present application, the battery pack further includes:

[0021] A lower box body, the cross beams and longitudinal beams of the lower box body define a plurality of installation spaces, the battery modules are installed in the installation spaces, and the battery management system daughter board is installed on the longitudinal beam.

[0022] According to an embodiment of the present application, the battery management system main board is installed between the front beam of the lower box body and the foremost cross beam.

[0023] In a third aspect, the present application also provides a vehicle, which includes: any one of the battery packs as described above.

[0024] For the vehicle according to the present application, through the arrangement of the above-mentioned battery pack, the working state inside the vehicle is maintained within a suitable voltage and temperature range, thereby improving the thermal management ability and charge-discharge ability of the whole vehicle, and further prolonging the service life of the vehicle.

[0025] The additional aspects and advantages of the present application will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0027] Figure 1 is a schematic structural diagram of the battery management system and the battery modules of the battery pack provided by the embodiment of the present application;

[0028] Figure 2 is a schematic structural diagram of the battery management system daughter board of the battery management system and the battery modules of the battery pack provided by the embodiment of the present application;

[0029] Figure 3 is a schematic structural diagram of the battery modules of the battery pack provided by the embodiment of the present application;

[0030] Figure 4 is a schematic structural diagram of the lower box body of the battery pack provided by the embodiment of the present application.

[0031] Reference numerals:

[0032] Battery management system 100, battery management system daughter board 110, battery management system daughter board one 110a, battery management system daughter board two 110b, battery management system daughter board three 110c, battery management system daughter board four 110d, analog front end one 111, analog front end two 112, analog front end three 113, analog front end four 114, battery management system main board 120, daisy chain communication line 130, high voltage connection conductor 140;

[0033] Battery module 200, battery cell 201, battery module one 210, battery module two 220, battery module three 230, battery module four 240, battery module five 250, battery module six 260, battery module seven 270, battery module eight 280;

[0034] Lower box body 300, cross beam 310, longitudinal beam 320, front beam 330. Detailed implementation manners

[0035] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0036] The present application discloses a battery management system 100.

[0037] Next, reference is made to Figures 1 - 3 to describe the battery management system 100 according to the embodiments of the present application.

[0038] In some embodiments, as Figures 1 - 3 shown, the battery management system 100 (BMS, Battery Management Systerm) is applied to a series-connected battery pack. The battery pack includes a plurality of series-connected battery modules 200. The battery module 200 may include a plurality of series-connected battery cells 201. The battery management system 100 includes: a battery management system main board 120 and a plurality of battery management system daughter boards 110.

[0039] Among them, a plurality means two or more than two. For example, in some embodiments, as Figures 1 - 3 shown, the battery pack includes 8 series-connected battery modules 200, and the battery module 200 includes 22 series-connected battery cells 201.

[0040] The battery management system daughter board 110 (BMU, Battery Module Unit) includes multiple groups of analog front ends (AFE, Analog Front End). The multiple groups of analog front ends of the same battery management system daughter board 110 are used to connect to multiple battery modules 200 in one-to-one correspondence to sample the voltage of the battery cells 201. The multiple battery modules 200 corresponding to at least one battery management system daughter board 110 are non-adjacent in the series loop.

[0041] The battery management system daughter board 110 can be used to sample the voltage of the battery module 200. Moreover, one battery management system daughter board 110 can sample the voltage of multiple battery modules 200, where multiple means two or more. For example, in some embodiments, as Figure 1 shown, one battery management system daughter board 110 can sample the voltage of two battery modules 200.

[0042] Multiple battery management system daughter boards 110 can be provided, where multiple means two or more. For example, in some embodiments, as Figure 2 shown, four battery management system daughter boards 110 are provided inside the battery management system 100. In the following, the example of four battery management system daughter boards 110 provided inside the battery management system 100 will be used for illustration.

[0043] Each battery management system daughter board 110 is used to sample the voltage of multiple battery modules 200. Each group of analog front ends of each battery management system daughter board 110 is used to sample the voltage of one battery module 200.

[0044] Each group of analog front ends includes at least one analog front end. For example Figure 2 in the example of, four analog front ends are provided inside the battery management system daughter board 110. The four analog front ends are divided into two groups, and each group includes two analog front ends. These two analog front ends are used to sample the voltage of the same battery module 200.

[0045] In actual execution, as Figures 1 - 3 shown, if one battery management system daughter board 110 samples the voltage of two battery modules 200, then four battery management system daughter boards 110 sample the voltage of eight battery modules 200. One battery management system daughter board 110 contains four analog front ends, that is, four analog front ends sample two battery modules 200, and two analog front ends sample the voltage of one battery module 200. Among them, one analog front end samples the voltage of 11 battery cells 201 in one battery module 200, and the other analog front end samples the voltage of the other 11 battery cells 201 in the same battery module 200.

[0046] It should be noted that the two battery modules 200 sampled by one battery management system daughter board 110 are not necessarily adjacent in the series circuit. For example, in some embodiments, as Figure 1 shown, among the four battery management system daughter boards 110, only the two battery modules 200 corresponding to one battery management system daughter board 110 are adjacent in the series circuit, and the two battery modules 200 respectively corresponding to the remaining three battery management system daughter boards 110 are not adjacent in the series circuit.

[0047] Through the above settings of the battery management system daughter board 110, one battery management system daughter board 110 realizes voltage sampling of two battery modules 200 by four analog front ends at the same time, and further realizes voltage sampling of the above battery pack by four battery management system daughter boards 110.

[0048] Multiple battery management system daughter boards 110 are electrically connected to the battery management system main board 120.

[0049] The battery management system main board 120 (BCU, Battery Cluster Unit) is used to integrate multiple voltage data signals sampled by multiple battery management system daughter boards 110. The battery management system main board 120 can be arranged on one side of multiple battery management system daughter boards 110. For example, in some embodiments, as Figure 1 shown, the battery management system main board 120 is located on the left side of the four battery management system daughter boards 110.

[0050] As Figure 1 shown, the four battery management daughter boards are respectively the battery management system daughter board one 110a, the battery management system daughter board two 110b, the battery management system daughter board three 110c, and the battery management system daughter board four 110d.

[0051] In actual execution, the battery management system main board 120 is first connected to the battery management system daughter board one 110a closest to it, then the battery management system daughter board one 110a is connected to the battery management system daughter board two 110b, then the battery management system daughter board two 110b is connected to the battery management system daughter board three 110c, then the battery management system daughter board three 110c is connected to the battery management system daughter board four 110d, and finally the battery management system daughter board four 110d is connected to the battery management system main board 120 again to form a closed loop.

[0052] Through the above settings of the battery management system main board 120, it is electrically connected to the four battery management system daughter boards 110 and forms a closed loop, thereby realizing signal integration of the four battery management system daughter boards 110.

[0053] In the related art, in order to meet the withstand voltage level of the battery management system daughter board, for a certain battery management system daughter board, only the voltages of multiple adjacent modules in the series circuit can be collected. Correspondingly, adjacent battery management system daughter boards can also only collect the voltages of adjacent battery modules, which will restrict the arrangement of multiple battery management system daughter boards and the overall wire harness is relatively long.

[0054] In the present application, by integrating multiple analog front ends in the battery management system daughter board 110, the battery management system daughter board 110 can sample the voltages of multiple non-adjacent modules in the series circuit. Combined with the spatial arrangement of the battery modules 200, the sequential arrangement of multiple battery management system daughter boards 110 can be realized, preventing misconnection, and the overall wire harness length can be controlled.

[0055] For the battery management system 100 provided by the embodiments of the present application, through the settings of the above-mentioned multiple battery management system daughter boards 110 and the battery management system main board 120, combined with the integration of multiple analog front ends and the sampling idea of non-adjacent modules in the series circuit, on the one hand, it liberates the arrangement constraints of multiple battery management system daughter boards 110 and the wire harness arrangement constraints from the battery management system daughter boards 110 to the battery modules 200; on the other hand, it reduces the situation of wire harness detours, thereby reducing the demand of the battery management system 100 for wire harnesses, and thus saving the manufacturing cost of the battery management system 100; on the third hand, it realizes the sequential connection of multiple battery management system daughter boards 110 in a closed loop, which is convenient for assembly.

[0056] In some embodiments, as Figure 1 shown, the battery management system daughter board 110 can be electrically connected to multiple battery modules 200 that are spatially adjacent to itself.

[0057] Taking the embodiment as Figure 1 shown as an example, the 8 battery modules 200 are respectively battery module one 210, battery module two 220, battery module three 230, battery module four 240, battery module five 250, battery module six 260, battery module seven 270 and battery module eight 280.

[0058] In actual implementation, the first battery management system daughter board 110a is electrically connected to the first battery module 210 and the eighth battery module 280, and both the first battery module 210 and the eighth battery module 280 are adjacent to the first battery management system daughter board 110a in terms of spatial position; the second battery management system daughter board 110b is electrically connected to the second battery module 220 and the seventh battery module 270, and both the second battery module 220 and the seventh battery module 270 are adjacent to the second battery management system daughter board 110b in terms of spatial position; the third battery management system daughter board 110c is electrically connected to the sixth battery module 260 and the third battery module 230, and both the third battery module 230 and the sixth battery module 260 are adjacent to the third battery management system daughter board 110c in terms of spatial position; the fourth battery management system daughter board 110d is electrically connected to the fourth battery module 240 and the fifth battery module 250, and both the fourth battery module 240 and the fifth battery module 250 are adjacent to the fourth battery management system daughter board 110d in terms of spatial position.

[0059] Through the above spatial arrangement of the battery management system daughter boards 110, the distance between the battery management system daughter board 110 and its corresponding two battery modules 200 is made close, shortening the sampling distance from one battery management system daughter board 110 to two battery modules 200, thereby reducing the length of the wiring harness between the battery management system daughter board 110 and the two battery modules 200.

[0060] In some embodiments, as Figures 1 - 2 shown, multiple series-connected battery modules 200 can form multiple columns in spatial arrangement. The battery modules 200 in the same column can be connected in series, and the last battery module 200 in adjacent columns of battery modules 200 can be connected in series; multiple battery management system daughter boards 110 can be arranged along the direction of the columns of the battery modules 200, and multiple analog front ends of the same battery management system daughter board 110 can be respectively used to electrically connect multiple battery modules 200 in different columns.

[0061] The above 8 battery modules 200 can form multiple columns in spatial arrangement. For example, in some embodiments, as Figure 1 shown, the 8 battery modules 200 form two columns in spatial arrangement. At the same time, the battery modules 200 can be electrically connected through the high-voltage connection conductor 140.

[0062] In actual implementation, as Figure 1Taking the illustrated embodiment as an example, battery module one 210, battery module two 220, battery module three 230, and battery module four 240 form the first column. Battery module one 210, battery module two 220, battery module three 230, and battery module four 240 are arranged in sequence from left to right in the spatial layout, and adjacent two battery modules 200 in the first column are connected to each other through high-voltage connection conductor 140; battery module five 250, battery module six 260, battery module seven 270, and battery module eight 280 form the second column, and battery module five 250, battery module six 260, battery module seven 270, and battery module eight 280 are arranged in sequence from right to left in the spatial layout, and adjacent two battery modules 200 in the second column are connected to each other through high-voltage connection conductor 140. The first column is located on the upper side of the 4 battery system sub-boards, and the second column is located on the lower side of the 4 battery system sub-boards. The rightmost battery module four 240 in the first column is electrically connected to the rightmost battery module five 250 in the second column through high-voltage connection conductor 140.

[0063] Taking the embodiment as shown in Figures 1 - 2 Taking the illustrated embodiment as an example, analog front end one 111 and analog front end two 112 in battery management system sub-board one 110a are electrically connected to battery module one 210 in the first column, and analog front end three 113 and analog front end four 114 in battery management system sub-board one 110a are electrically connected to battery module eight 280 in the second column, thereby realizing the electrical connection between battery management system sub-board one 110a and battery module one 210 and battery module eight 280 located in different columns.

[0064] Similarly, analog front end one 111 and analog front end two 112 in battery management system sub-board two 110b are electrically connected to battery module two 220 in the first column, and analog front end three 113 and analog front end four 114 in battery management system sub-board two 110b are electrically connected to battery module seven 270 in the second column, thereby realizing the electrical connection between battery management system sub-board two 110b and battery module two 220 and battery module seven 270 located in different columns.

[0065] Analog front end one 111 and analog front end two 112 in battery management system sub-board three 110c are electrically connected to battery module three 230 in the first column. At the same time, analog front end three 113 and analog front end four 114 in battery management system sub-board three 110c are electrically connected to battery module six 260 in the second column, thereby realizing the electrical connection between battery management system sub-board three 110c and battery module three 230 and battery module six 260 located in different columns.

[0066] The analog front end one 111, the analog front end two 112 in the battery management system sub-board four 110d are electrically connected to the battery module four 240 in the first column. At the same time, the analog front end three 113 and the analog front end four 114 in the battery management system sub-board four 110d are electrically connected to the battery module five 250 in the second column, so as to realize the electrical connection between the battery management system sub-board four 110d and the battery modules four 240 and five 250 located in different columns.

[0067] Through the design of the above-mentioned spatial arrangement method of the battery module 200, the battery management system sub-board 110 is realized to be connected to the battery modules 200 in different columns at the same time, ensuring that the 4 battery management system sub-boards 110 can be arranged sequentially in the spatial position, thus simplifying the internal connection structure of the battery management system 100 and facilitating installation.

[0068] In some embodiments, as Figure 1 shown, multiple battery management system sub-boards 110 can be electrically connected to the battery management system main board 120 through the daisy chain communication line 130, and the multiple battery management system sub-boards are arranged in the order of daisy chain communication.

[0069] The daisy chain communication line 130 can be used for the connection and signal transmission between adjacent two components. In actual implementation, as Figure 1 shown, the battery management system main board 120, the battery management system sub-board one 110a, the battery management system sub-board two 110b, the battery management system sub-board three 110c and the battery management system sub-board four 110d are arranged in sequence from left to right in space, and the battery management system main board 120, the battery management system sub-board one 110a, the battery management system sub-board two 110b, the battery management system sub-board three 110c and the battery management system sub-board four 110d are connected pairwise, and the battery management system main board 120 located at the leftmost end is connected to the battery management system sub-board four 110d located at the rightmost end to form a closed loop with the head and tail connected, and the voltage signal obtained after acquisition is transmitted through the above loop.

[0070] Through the above setting of the daisy chain communication line 130, it matches the sequential arrangement of the 4 battery management system sub-boards 110 in the closed loop, realizes the head-to-tail connection of the 4 battery management system sub-boards 110 and the battery management system main board 120, ensures that the two components connected to each other in the closed loop can transmit signals. At the same time, the connection structure is simple and direct, avoiding the assembly error caused by the difficult-to-remember irregular order of the 4 battery management system sub-boards 110. Secondly, the cost of the daisy chain communication line 130 is also relatively reduced, thus improving the economy of the battery management system 100.

[0071] In some embodiments, as Figures 1 - 2As shown, multiple series-connected battery modules 200 can form multiple rows in spatial arrangement, and each battery management system daughter board 110 can be arranged between multiple battery modules 200 in the same row. Multiple groups of analog front ends of the same battery management system daughter board 110 can be respectively used to electrically connect multiple battery modules 200 in the same row.

[0072] The above 8 battery modules 200 can form multiple rows in spatial arrangement. For example, in some embodiments, as Figure 1 shown, 8 battery modules 200 form 4 rows in spatial arrangement.

[0073] In actual implementation, taking the embodiment as shown in Figure 1 as an example, battery module one 210 and battery module eight 280 form the first row, and battery management system daughter board one 110a is located in the middle of battery module one 210 and battery module eight 280 in the first row; battery module two 220 and battery module seven 270 form the second row, and battery management system daughter board two 110b is located in the middle of battery module two 220 and battery module seven 270 in the second row; battery module three 230 and battery module six 260 form the third row, and battery management system daughter board three 110c is located in the middle of battery module three 230 and battery module six 260 in the third row; battery module four 240 and battery module five 250 form the fourth row, and battery management system daughter board four 110d is located in the middle of battery module four 240 and battery module five 250 in the fourth row.

[0074] Taking the embodiment as shown in Figures 1 - 2 as an example, analog front end one 111 and analog front end two 112 in battery management system daughter board one 110a of the first row are electrically connected to battery module one 210 of the first row. At the same time, analog front end three 113 and analog front end four 114 in battery management system daughter board one 110a of the first row are electrically connected to battery module eight 280 of the first row, so as to realize the electrical connection between battery management system daughter board one 110a and battery module one 210 and battery module eight 280 in the same row.

[0075] Similarly, analog front end one 111 and analog front end two 112 in battery management system daughter board two 110b of the second row are electrically connected to battery module two 220 of the second row. At the same time, analog front end three 113 and analog front end four 114 in battery management system daughter board two 110b of the second row are electrically connected to battery module seven 270 of the second row, so as to realize the electrical connection between battery management system daughter board two 110b and battery module two 220 and battery module seven 270 in the same row.

[0076] The analog front end one 111 and the analog front end two 112 in the battery management system daughter board three 110c of the third row are electrically connected to the battery module three 230 of the third row. At the same time, the analog front end three 113 and the analog front end four 114 in the battery management system daughter board three 110c of the third row are electrically connected to the battery module six 260 of the third row, so as to realize the electrical connection between the battery management system daughter board three 110c and the battery module three 230 and the battery module six 260 in the same row.

[0077] The analog front end one 111 and the analog front end two 112 in the battery management system daughter board four 110d of the fourth row are electrically connected to the battery module four 240 of the fourth row. At the same time, the analog front end three 113 and the analog front end four 114 in the battery management system daughter board four 110d of the fourth row are electrically connected to the battery module five 250 of the fourth row, so as to realize the electrical connection between the battery management system daughter board four 110d and the battery module four 240 and the battery module five 250 in the same row.

[0078] Through the design of the above spatial layout method of the battery module 200, the battery management system daughter board 110 is connected to two battery modules 200 in the same row at the same time, shortening the length of the connection path between the battery management system daughter board 110 and its corresponding two battery modules 200, thereby reducing the amount of connection wire harness, and further realizing cost control.

[0079] In some embodiments, as Figures 1 - 2 shown, multiple series-connected battery modules 200 can form multiple arrangements in spatial layout. The battery modules 200 in the same column can be connected in series, and the last battery module 200 in the adjacent column battery modules 200 can be connected in series; multiple battery management system daughter boards 110 can be arranged along the direction of the column of the battery module 200, and each battery management system daughter board 110 can be arranged between multiple battery modules 200 in the same row. Multiple groups of analog front ends of the same battery management system daughter board 110 can be respectively used to electrically connect multiple battery modules 200 in different columns in the same row.

[0080] In actual implementation, as Figures 1 - 2Taking the illustrated embodiment as an example, the first battery management system daughter board 110a is simultaneously connected to the first battery module 210 in the first row and the first column and the eighth battery module 280 in the first row and the second column. Among them, the first battery module 210 and the eighth battery module 280 are not adjacent in the closed loop; the second battery management system daughter board 110b is simultaneously connected to the second battery module 220 in the second row and the first column and the seventh battery module 270 in the second row and the second column. Among them, the second battery module 220 and the seventh battery module 270 are not adjacent in the closed loop; the third battery management system daughter board 110c is simultaneously connected to the third battery module 230 in the third row and the first column and the sixth battery module 260 in the third row and the second column. Among them, the third battery module 230 and the sixth battery module 260 are not adjacent in the closed loop; the fourth battery management system daughter board 110d is simultaneously connected to the fourth battery module 240 in the fourth row and the first column and the fifth battery module 250 in the fourth row and the second column. Among them, the fourth battery module 240 and the fifth battery module 250 are adjacent in the closed loop.

[0081] Through the spatial arrangement of the above battery modules 200 and the battery management system daughter boards 110, the battery management system daughter boards 110 are realized to be simultaneously connected to two battery modules 200 in different columns of the same row. Combining with the layout idea that the batteries are not necessarily adjacent, the situation of wire harness detouring in the battery management system 100 is reduced, enabling the battery management system daughter boards 110 to sample the two nearest battery modules 200 following the principle of proximity. Thus, the layout constraints of the battery management system daughter boards 110 in terms of spatial position and the wire harness layout from the battery management system daughter boards 110 to the battery modules 200 are liberated. At the same time, the sequential connection of the battery management system daughter boards 110 in the closed loop is ensured, avoiding the misconnection situation caused by confusing the order of the battery management system daughter boards 110 during assembly.

[0082] This application also discloses a battery pack.

[0083] Next, refer to Figures 1 - 4 to describe the battery pack according to the embodiment of the present application.

[0084] In some embodiments, as Figures 1 - 4 shown, the battery pack includes: any one of the above battery management systems 100 and multiple serially connected battery modules 200.

[0085] The battery module 200 includes multiple serially connected battery cells 201.

[0086] Among them, multiple means 2 or more than 2. For example, in some embodiments, as Figures 2 - 3 shown, the battery module 200 includes 22 serially connected battery cells 201.

[0087] In actual implementation, multiple battery cells 201 are stacked in the thickness direction according to a certain stacking order. Specifically, the stacking order is to first place a side plate, then place an elastic pad, and then stack multiple battery cells 201 according to the designed quantity. An insulation pad should be placed between every two battery cells 201, and the positive and negative electrodes of the battery cells 201 are arranged alternately. After the battery cells 201 and the insulation pads are stacked, finally, the elastic pad and the side plate are placed successively. The finally obtained battery module 200 is welded and connected to the high-voltage connection conductor 140.

[0088] For the battery pack provided by the embodiment of the present application, through the setting of multiple serially connected battery modules 200 and the above-mentioned battery management system 100, on the one hand, effective implementation of battery cell balancing management, reliable insulation monitoring and safety monitoring of the battery pack, real-time sending of fault diagnosis information, and realization of reliable and safe management of the battery system; on the other hand, intelligent management and maintenance of each battery unit, prevention of overcharging and over-discharging of the battery, effective control and safety monitoring of the fast charging and slow charging processes of the power battery, thereby extending the service life of the battery.

[0089] In some embodiments, such as Figure 4 shown, the battery pack may further include: a lower box body 300.

[0090] The cross beams 310 and longitudinal beams 320 of the lower box body 300 can define multiple installation spaces, the battery module 200 can be installed in the installation space, and the battery management system daughter board 110 can be installed on the longitudinal beam 320.

[0091] The lower box body 300 can be used to support the internal structure of the battery pack and provide an installation space for the battery module 200. Taking the embodiment as shown in Figure 4 as an example, the lower box body 300 may include a front beam 330, a cross beam 310, and a longitudinal beam 320.

[0092] The number of longitudinal beams 320 can be one or more, where multiple means two or more. For example, in some embodiments, as shown in Figure 4 shown, the number of longitudinal beams 320 is one.

[0093] The number of cross beams 310 can be one or more, where multiple means two or more. For example, in some embodiments, as shown in Figure 4 shown, the number of cross beams 310 is five.

[0094] In actual implementation, taking the examples as shown in Figure 1 and Figure 4Taking the illustrated embodiment as an example, inside the lower box body 300, 8 independent cavities are formed by 5 cross beams 310 and 1 longitudinal beam 320. Inside the 8 independent cavities, battery module one 210, battery module two 220, battery module three 230, battery module four 240, battery module five 250, battery module six 260, battery module seven 270, and battery module eight 280 are arranged. The longitudinal beam 320 of the lower box body 300 can be in a hollow state, and battery management system daughter board one 110a, battery management system daughter board two 110b, battery management system daughter board three 110c, and battery management system daughter board four 110d are installed inside the hollow longitudinal beam 320.

[0095] Through the above arrangement of the lower box body 300, the installation of the above-mentioned multiple battery modules 200 and the above-mentioned multiple battery management system daughter boards 110 inside the battery pack is realized. On the one hand, the battery modules 200 and the battery management system daughter boards 110 are fixed inside the battery pack to prevent them from shaking randomly inside the battery pack; on the other hand, the lower box body 300 is installed as a whole inside the battery pack, increasing the strength and stiffness of the battery pack itself.

[0096] In some embodiments, as Figure 1 and Figure 4 shown, the battery management system main board 120 can be installed between the front beam 330 of the lower box body 300 and the foremost cross beam 310.

[0097] The daisy chain communication line 130 between the battery management system main board 120 and the battery management system daughter board 110 and the wiring harness between the battery management system daughter board 110 and the battery module 200 bracket can be arranged above the lower box body 300. Or, reasonable openings are made in the cross beams 310 and longitudinal beam 320 inside the lower box body 300, and the daisy chain communication line 130 between the battery management system main board 120 and the battery management system daughter board 110 and the wiring harness between the battery management system daughter board 110 and the battery module 200 bracket can be arranged inside the lower box body 300. For example, in some embodiments, the daisy chain communication line 130 between the battery management system main board 120 and the battery management system daughter board 110 and the wiring harness between the battery management system daughter board 110 and the battery module 200 bracket can be arranged inside the lower box body 300.

[0098] In actual implementation, as Figure 1 and Figure 4Taking the illustrated embodiment as an example, the front beam 330 of the lower box body 300 and the cross beam 310 closest to the front beam 330 can form an installation area together, and the main board 120 of the battery management system is arranged in the installation area. At this time, the battery module one 210, the battery module two 220, the battery module three 230, the battery module four 240, the battery module five 250, the battery module six 260, the battery module seven 270, and the battery module eight 280 are arranged in the 8 independent cavities inside the lower box body 300. Moreover, the above 8 battery modules 200 are connected in series. The battery management system sub-board one 110a, the battery management system sub-board two 110b, the battery management system sub-board three 110c, and the battery management system sub-board four 110d are installed in the hollow longitudinal beam 320. The battery management system sub-boards 110 in the longitudinal beam 320 are respectively electrically connected to the corresponding battery modules 200. The main board 120 of the battery management system between the front beam 330 and the frontmost cross beam 310 of the lower box body 300 is electrically connected to the battery management system sub-boards 110 in the longitudinal beam 320.

[0099] Through the setting of the arrangement position of the main board 120 of the battery management system, combined with the arrangement of the above battery modules 200 and the battery management system sub-boards 110, the installation of the entire battery management system 100 and the battery modules 200 inside the lower box body 300 is realized, thus avoiding the battery management system 100 occupying too much space inside the battery, and further reducing the overall volume of the battery pack.

[0100] This application also discloses a vehicle.

[0101] In some embodiments, the vehicle may include any one of the above battery packs.

[0102] For the vehicle provided by the embodiments of this application, through the setting of the above battery pack, the working state inside the vehicle is maintained within a suitable voltage and temperature range, thereby improving the thermal management ability and charge and discharge ability of the whole vehicle, and further extending the service life of the vehicle.

[0103] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0104] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0105] In the description of the present application, the "first feature" and "second feature" may include one or more of such features.

[0106] In the description of the present application, the meaning of "a plurality" is two or more.

[0107] In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0108] In the description of the present application, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0109] In the description of this specification, descriptions with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0110] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery management system is applied to a series-connected battery pack. The battery pack includes a plurality of serially connected battery modules, and each battery module includes a plurality of serially connected battery cells. It is characterized in that, The battery management system includes: A plurality of battery management system daughter boards, each of the battery management system daughter boards including multiple groups of analog front ends. The multiple groups of analog front ends of the same battery management system daughter board are used to respectively connect to multiple battery modules one by one to sample the voltage of the battery cells. Among the multiple battery modules corresponding to at least one of the battery management system daughter boards, they are non-adjacent in the series loop. Among them, The multiple series-connected battery modules are arranged in multiple rows and columns in space. The battery modules in the same column are connected in series, and the last battery module in the adjacent column battery modules is connected in series. Each of the battery management system daughter boards is arranged between multiple battery modules in the same row. The multiple groups of analog front ends of the same battery management system daughter board are respectively used to electrically connect to multiple battery modules in the same row; A battery management system main board, to which the multiple battery management system daughter boards are electrically connected.

2. The battery management system according to claim 1, wherein The battery management system daughter board is electrically connected to multiple battery modules adjacent to itself in space layout.

3. The battery management system according to claim 2, wherein, The multiple battery management system daughter boards are arranged along the direction of the columns of the battery modules. The multiple groups of analog front ends of the same battery management system daughter board are respectively used to electrically connect to multiple battery modules in different columns.

4. The battery management system according to any one of claims 1 to 3, characterized in that, The multiple battery management system daughter boards are electrically connected to the battery management system main board through daisy-chain communication lines, and the multiple battery management system daughter boards are arranged in the order of daisy-chain communication.

5. The battery management system according to any one of claims 1-3, characterized in that The multiple series-connected battery modules are arranged in multiple arrays in space. The battery modules in the same column are connected in series, and the last battery module in the adjacent column battery modules is connected in series; The multiple battery management system daughter boards are arranged along the direction of the columns of the battery modules, and each of the battery management system daughter boards is arranged between multiple battery modules in the same row. The multiple groups of analog front ends of the same battery management system daughter board are respectively used to electrically connect to multiple battery modules in different columns in the same row.

6. A battery pack, characterized in that, Including: Multiple series-connected battery modules, each of the battery modules including multiple series-connected battery cells; The battery management system according to any one of claims 1-5.

7. The battery pack according to claim 6, wherein, Further including: A lower box body, the cross beams and longitudinal beams of the lower box body defining multiple installation spaces, where the battery modules are installed in the installation spaces, and the battery management system daughter boards are installed on the longitudinal beams.

8. The battery pack according to claim 7, wherein The battery management system main board is installed between the front beam of the lower box body and the foremost cross beam.

9. A vehicle, characterized in that, Including: The battery pack according to any one of claims 6-8.

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