CN112271410A

CN112271410A - Power battery and driving equipment

Info

Publication number: CN112271410A
Application number: CN202011127708.5A
Authority: CN
Inventors: 王明; 谷文博; 王君君; 姜辉; 宋博涵
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-01-26
Also published as: WO2022083163A1

Abstract

The invention discloses a power battery and driving equipment, wherein the power battery comprises a high-voltage system, a low-voltage system and a module assembly; the high-voltage system comprises a plurality of soft copper bars, a plurality of hard copper bars and at least one fuse. Carry out the high-pressure connection through the mode that the soft copper bar that use length is less than predetermineeing length and hard copper bar and combine together, solved and used long copper bar to constitute the great technical problem of electromagnetic interference that high-voltage circuit caused, through with the fuse external arrange the module assembly in on, solved the fuse external arrange the inside inconvenient technical problem of maintenance that leads to of power battery in. This application has realized reducing power battery's low frequency magnetic field transmission, has reduced the technical effect to power battery's battery module's electromagnetic interference to and realized the technical effect that the fuse is convenient for maintain.

Description

Power battery and driving equipment

Technical Field

The embodiment of the invention relates to the technical field of power batteries, in particular to a power battery and driving equipment.

Background

With the continuous development and growth of new energy automobile industry, the new energy automobile reserve in the society is rapidly increased, and the safety of the new energy automobile is paid more attention to consumers and manufacturers along with the increase of the reserve. The power battery is used as a core high-voltage and high-energy component of the new energy automobile, and the characteristics of high safety are required to be simultaneously achieved, so that the personal and property safety of consumers can be ensured. The high-low voltage connection system of the power battery bears the functions of connection, open circuit protection, communication, sampling and the like of the high-voltage system and the low-voltage system of the power battery, and is an important link of the safety design of the power battery.

However, current power battery uses long copper bar to constitute high-voltage circuit usually, and electromagnetic interference is great, produces the influence to the battery module easily, and the fuse among the power battery sets up inside the power battery, causes to maintain inconveniently.

Disclosure of Invention

The invention provides a power battery and driving equipment, which solve the problems of large electromagnetic interference caused by a high-voltage loop formed by long copper bars in the power battery in the prior art and difficult maintenance caused by the fact that a fuse of the power battery is arranged in the power battery.

The embodiment of the invention provides a power battery, which comprises a high-voltage system, a low-voltage system and a module assembly, wherein the high-voltage system comprises a high-voltage power supply, a low-voltage power supply and a power supply;

the high-voltage system comprises a plurality of soft copper bars, a plurality of hard copper bars and at least one fuse protector; the lengths of the soft copper bar and the hard copper bar are both smaller than a preset length; the high-voltage system is electrically connected with the module assembly through the soft copper bar and the hard copper bar; the fuse is externally arranged on the module assembly and is electrically connected with the module assembly through the hard copper bar;

the low-voltage system comprises a connecting wire harness and a distributed battery management system controller, and the distributed battery management system controller is arranged on the module assembly and is electrically connected with the module assembly through the connecting wire harness;

the module assembly includes a plurality of battery modules, and is a plurality of the battery module is snakelike to connect in order, and is a plurality of first battery module and last battery module in the battery module are adjacent to be set up.

Further, the distributed battery management system controller comprises a master controller, a first slave controller and a second slave controller;

the first slave controller and the second slave controller are electrically connected with the master controller through the connecting wire harness;

the first slave controller and the second slave controller respectively comprise a plurality of sampling chips; one sampling chip correspondingly collects the electric quantity information of the battery modules in a preset quantity.

Further, the fuse is arranged between the two sampling chips.

Further, the high voltage system comprises at least one first rigid copper bar and at least one second rigid copper bar;

the first hard copper bar and the second hard copper bar are used for achieving the electrical connection between the fuse and the module assembly.

Furthermore, the preset number of the battery modules which are correspondingly collected by one sampling chip are arranged adjacently.

Further, the high-voltage system further comprises a high-voltage distribution box, a first soft copper bar, a second soft copper bar, a third soft copper bar, a fourth soft copper bar, a fifth soft copper bar and a sixth soft copper bar;

the high-voltage distribution box is electrically connected with the module assembly through the first soft copper bar and the second soft copper bar;

the high-voltage distribution box is electrically connected with the power battery whole-package high-voltage interface through the third soft copper bar, the fourth soft copper bar, the fifth soft copper bar and the sixth soft copper bar.

Further, the high-voltage system also comprises a plurality of third hard copper bars, a plurality of fourth hard copper bars, a plurality of fifth hard copper bars and a plurality of sixth hard copper bars;

the third hard copper bar, the fourth hard copper bar, the fifth hard copper bar and the sixth hard copper bar are all used for electric connection among the battery modules.

Furthermore, the module assembly comprises n battery modules, and the first slave controller and the second slave controller both comprise m sampling chips; each sampling chip collects the electric quantity information of p battery modules, wherein p is more than or equal to n, and n, m and p are integers more than or equal to 1.

Further, the module assembly comprises 24 battery modules; the first slave controller and the second slave controller respectively comprise 4 sampling chips; every sampling chip gathers 3 the electric quantity information of battery module.

The embodiment of the invention also provides driving equipment, which is characterized by comprising the power battery in any one of the embodiments.

Drawings

Fig. 1 is a structural diagram of a power battery provided in an embodiment of the invention;

FIG. 2 is a block diagram of a high voltage system provided by an embodiment of the present invention;

FIG. 3 is a block diagram of a low pressure system provided by an embodiment of the present invention;

FIG. 4 is a block diagram of a module assembly according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a fuse disposed between sampling chips according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an abnormal disconnection of a fuse provided by an embodiment of the present invention;

fig. 7 is a topology of a sampling chip according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.

Fig. 1 is a structural diagram of a power battery according to an embodiment of the present invention. Fig. 2 is a block diagram of a high voltage system provided by an embodiment of the present invention.

As shown in fig. 1, the power battery includes a high voltage system 10, a low voltage system 20 and a module assembly 30; the high voltage system 10 includes a plurality of soft copper bars, a plurality of hard copper bars, and at least one fuse 100; the lengths of the soft copper bar and the hard copper bar are both smaller than a preset length; the high-voltage system 10 is electrically connected with the module assembly 30 through a soft copper bar and a hard copper bar; the fuse 100 is externally mounted on the module assembly 30 and electrically connected to the module assembly 30 through the hard copper bar.

Optionally, as shown in fig. 2, the high voltage system 10 comprises at least one first rigid copper bar 11 and at least one second rigid copper bar 12; the first and

second copper busbar

11 and 12 are used for electrically connecting the fuse 100 and the module assembly 30.

Optionally, as shown in fig. 2, the high-voltage system 10 further includes a high-voltage distribution box 110, a first soft copper bar 111, a second soft copper bar 112, a third soft copper bar 113, a fourth soft copper bar 114, a fifth soft copper bar 115, and a sixth soft copper bar 116; the high-voltage distribution box 110 is electrically connected with the module assembly 30 through a first soft copper bar 111 and a second soft copper bar 112; the high-voltage distribution box 110 is electrically connected with the power battery whole-pack high-voltage interface through a third soft copper bar 113, a fourth soft copper bar 114, a fifth soft copper bar 115 and a sixth soft copper bar 116.

Optionally, as shown in fig. 2, the high voltage system 10 further includes a plurality of third rigid copper bars 13, a plurality of fourth rigid copper bars 14, a plurality of fifth rigid copper bars 15, and a plurality of sixth rigid copper bars 16; the third rigid copper bar 13, the fourth rigid copper bar 14, the fifth rigid copper bar 15 and the sixth rigid copper bar 16 are all used for electrical connection among the battery modules.

Specifically, referring to fig. 1 and 2, the high voltage system 10 includes a plurality of soft copper bars and a plurality of hard copper bars. The lengths of the soft copper bars and the hard copper bars are smaller than the length of the common long copper bars, so that the connection between the high-voltage system 10 and the module assembly 30 is realized, and the connection between the battery modules in the module assembly 30 is realized. The arrangement mode of mixed use of soft and hard copper bars in the high-voltage system 10 makes the electric connection form of the power battery more convenient; the soft copper bar belongs to the laminated busbar, the inductance value of the high-voltage loop can be greatly reduced by the laminated busbar, and the electromagnetic interference generated by high-voltage current is reduced; in the soft and hard copper bars of the high-voltage system 10, the longest soft copper bar is the third soft copper bar 113 shown in fig. 2, the longest hard copper bar is the sixth hard copper bar 16 shown in fig. 2, but both of them are shorter in length, and the soft and hard copper bars with shorter length are used to form a high-voltage loop, so that the low-frequency magnetic field emission is reduced, and the electromagnetic interference on sensitive components such as a Battery Management System (BMS) in the power battery is reduced in a 'source restraining' mode.

Fig. 3 is a block diagram of a low pressure system provided by an embodiment of the present invention.

Referring to fig. 1 and 3, the low voltage system 20 includes a connection harness 21 and a distributed battery management system controller 22, and the distributed battery management system controller 22 is disposed on the module assembly 30 and electrically connected to the module assembly 30 through the connection harness 21.

Alternatively, as shown in fig. 3, the distributed battery management system controller 22 includes a master controller 221, a first slave controller 222, and a second slave controller 223; the first slave controller 222 and the second slave controller 334 are electrically connected with the master controller 221 through the connection harness 21; the first slave controller 222 and the second slave controller 223 each include a plurality of sampling chips; a sampling chip correspondingly collects the electric quantity information of a preset number of battery modules.

Specifically, one sampling chip generally has 12 to 16 sampling channels therein, and each sampling channel can correspondingly acquire corresponding data of the battery cells in the battery module. The plurality of sampling chips in the first slave controller 222 and the second slave controller 223 collect various data of the battery module in real time, the collected data are transmitted to the master controller 221 through the connecting wiring harness 21 to be analyzed, and the master controller 221 can communicate with the whole vehicle system through the connecting wiring harness 21 and transmit corresponding analysis data to the whole vehicle system.

Fig. 4 is a structural diagram of a module assembly according to an embodiment of the present invention.

Referring to fig. 1 and 4, the module assembly 30 includes a plurality of battery modules, which are sequentially connected in a serpentine shape, and a first battery module and a last battery module among the plurality of battery modules are adjacently disposed.

Illustratively, the battery module may be a standard VDA 355. In fig. 4, 24 VDAs 355 are taken as an example and are respectively marked by circular frames on each battery module, and it can be seen that 24 battery modules are sequentially connected with high voltage in a serpentine manner according to the numbering sequence, wherein the first battery module 1 is a main negative of the high voltage connection of the battery system, the last battery module 24 is a main positive of the high voltage connection of the battery system, and the first battery module 1 and the last battery module 24 are adjacently arranged. Adopt such arrangement mode to set up battery module for the length of carrying out the hard copper bar that high-pressure connection used has obtained shortening, thereby has avoided using the great problem of electromagnetic interference that traditional long copper bar polarity high-pressure connection leads to.

Optionally, the module assembly 30 includes n battery modules, and each of the first slave controller 222 and the second slave controller 223 includes m sampling chips; each sampling chip collects the electric quantity information of p battery modules, wherein p is more than or equal to n, and n, m and p are integers more than or equal to 1.

Specifically, the number n of the battery modules in the module assembly 30 can be set arbitrarily as required, the number of the sampling channels in the sampling chip can be reserved, and not all the sampling channels necessarily collect data of a single battery in one battery module correspondingly, so that p × 2m can be greater than the number of the battery modules n.

Illustratively, referring to fig. 4, the module assembly includes 24 battery modules; the first slave controller 222 and the second slave controller 223 each include 4 sampling chips; each sampling chip collects the electric quantity information of 3 battery modules, and at the moment, 8 sampling chips can collect the data of 24 battery modules in total, namely p 2m n.

It should be noted that the number of slave controllers can also be set according to needs, and two slave controllers, i.e. the first slave controller 222 and the second slave controller 223, are exemplarily provided in this application.

Fig. 5 is a schematic diagram of a fuse disposed between sampling chips according to an embodiment of the present invention. Fig. 6 is a schematic diagram of an abnormal disconnection of a fuse according to an embodiment of the present invention.

Alternatively, as shown in fig. 5, the fuse 100 is disposed between two sampling chips.

Specifically, referring to fig. 5 and 6, one battery module includes a plurality of battery cells, one sampling chip includes a plurality of sampling channels, and corresponding data of one battery cell is collected correspondingly every other sampling channel, and fig. 5 and 6 only exemplarily show schematic diagrams of three sampling channels of each sampling chip, and actually, there are more than three sampling channels in each sampling chip, which is not described herein again. The arrangement position of the fuse 100 is selected between the two battery modules connected in series, when the fuse 100 is disconnected due to the abnormal state of the battery modules, the total voltage of the battery modules on the two sides of the fuse 100 is half of the total voltage of the power battery, and the high-voltage danger can be reduced.

As shown in fig. 6, the off time of the fuse 100 is usually in the order of milliseconds, the off process is a process in which the internal resistance becomes large, and the internal resistance changes from milliohms to megaohms. In the process of disconnection of fuse 100, because the electric current does not have the mutability, the voltage at fuse 100 both ends can increase in the twinkling of an eye, and the voltage of increase can be applied between two sampling chips, and can not act on the passageway of sampling chip, and mutual isolation between the sampling chip, and the reverse voltage that consequently produces can not lead to the fact the damage to the sampling chip to the problem that fuse 100 abnormal disconnection leads to the sampling chip to damage has been solved.

It should be noted that, the number of channels of the mainstream sampling chip of the current battery controller is 12 to 16, and increases year by year, and the number of channels of the battery cell in the battery module is generally not more than 10 because of the requirements of platformization and standardization. Such development trend for every sampling chip need gather the corresponding data of a plurality of battery module, and the connection copper bar between the battery module can influence the sampling precision, and copper bar and fuse between general battery module also can occupy a passageway of sampling chip, with the free voltage acquisition precision problem of solution battery, and realize the detection of battery internal connection impedance.

Exemplarily, take 24 battery modules as an example, because every interval includes 4 sampling chips from the controller in this application, every sampling chip possesses 48 sampling channels, and every sampling chip gathers the corresponding data of three battery module, consequently in order to guarantee that fuse 100 sets up between two sampling chips, need be separated every three of battery module for a set of, set up fuse 100 between arbitrary two sets of battery modules to make fuse 100 can guarantee to set up between two sampling chips. Referring to fig. 1 and 2, in the present application, the fuse 100 is disposed between the battery module 12 and the battery module 13, that is, the battery modules 1, 2, and 3 are a group, 4, 5, and 6 are a group, 7, 8, and 9 are a group, 10, 11, and 12 are a group, 13, 14, and 15 are a group, 16, 17, and 18 are a group, 19, 20, and 21 are a group, and 22, 23, and 24 are a group, each group of the battery modules corresponds to data collection by a sampling chip, and the fuse 100 is disposed between the

battery modules

12 and 13, i.e., disposed between two sampling chips, and accordingly, the fuse 100 may also be disposed between the battery module 9 and the battery module 10, which is not described herein again. With fuse 100 set up between two sampling chips, the reverse voltage that fuse 100 disconnection produced in the twinkling of an eye can not be used in BMS from the passageway of controller sampling chip, has solved the problem that fuse 100 abnormal disconnection leads to the sampling chip to damage and arouse power battery incident from the source.

It should be noted that, in the above embodiment, each sampling chip acquires corresponding data of three battery modules, in order to ensure that the fuse 100 is disposed between two sampling chips, every three battery modules need to be divided into one group, and the fuse 100 is disposed between two groups of battery modules; correspondingly, if the corresponding data of five battery modules of every sampling chip collection, then need be separated every five of battery modules for a set of, set up fuse 100 between arbitrary two sets of battery modules, can guarantee that fuse 100 sets up between two sampling chips, when the corresponding data of a battery module can be gathered to every sampling chip promptly, then need separate every a of battery module for a set of, set up fuse 100 between arbitrary two sets of battery modules can.

Optionally, the preset number of battery modules acquired by one sampling chip are arranged adjacently.

Specifically, as shown in fig. 7, the topology of the sampling chip is from low to high, consistent with the high-voltage topology of the battery. Each sampling chip in the slave controller is arranged on the battery daughter board, fig. 7 exemplarily shows that two sampling chips are arranged on one battery daughter board, and other sampling chips can be arranged as required in actual arrangement.

The existing sampling chip is arranged in order that a sampling chip 1 on a battery daughter board 1 collects data of a battery module 3, a sampling chip 2 collects data of a battery module 4, the sampling chip 3 on the battery daughter board 2 collects data of the battery module 2, the sampling chip 4 collects data of a battery module 5, the sampling chip 5 on the battery daughter board 3 collects data of the battery module 1, and the sampling chip 6 collects data of the battery module 6. in the process of assembling a battery assembly, copper bars in the middle of the battery modules are generally connected at last to avoid high-voltage danger, after a high-voltage copper bar in the middle of a battery is assembled, the battery module equivalently charges an isolation capacitor in the battery daughter board, the farther the battery module sampled by different sampling chips on the battery daughter board is relatively, the larger the equivalent loop voltage is, when the loop voltage is greater than the voltage-withstanding grade of the sampling chip, the loop is broken down, and transient discharge, damage to the sampling chip can result. When the high-voltage copper bar in the middle of the assembly battery, the voltage of 6 battery modules with can charge to isolation capacitor on the battery daughter board 3 promptly, if module voltage with be greater than the withstand voltage grade of sampling chip, can lead to the sampling chip on the battery daughter board 3 to damage.

Referring to fig. 7, the battery daughter board that will set up the sampling chip in this application arranges in proper order, the sampling chip on every battery daughter board also arranges in proper order, gather to last battery module in proper order from first battery module respectively, sampling chip 1 on the battery daughter board 1 gathers the data of battery module 1 promptly, sampling chip 2 gathers the data of battery module 2, the data of battery module 3 are gathered to sampling chip 3 on the battery daughter board 2, the data of battery module 4 are gathered to sampling chip 4, the data of battery module 5 are gathered to sampling chip 5 on the battery daughter board 3, the data of battery module 6 are gathered to sampling chip 6. And when the high-voltage copper bar in the middle of the battery is assembled, high-voltage loops can not be generated at two ends of the sampling chip in the same battery daughter board, and transient high voltage can not occur, so that the problem that the sampling chip is damaged when the high-voltage copper bar in the middle of the battery is assembled is solved.

In the embodiment of the invention, by using the power battery provided by the invention, the following advantages are achieved:

(1) the copper bar has the characteristics of no long copper bar and low electromagnetic interference. The arrangement mode of mixed use of soft and hard copper bars in the high-voltage system makes the electric connection form of the power battery more convenient; the soft copper bar belongs to the laminated busbar, the inductance value of the high-voltage loop can be greatly reduced by the laminated busbar, and the electromagnetic interference generated by high-voltage current is reduced; the high-voltage circuit is formed by the soft copper bars and the hard copper bars which are short in length, low-frequency magnetic field emission is reduced, and electromagnetic interference on sensitive components such as BMS in the power battery is reduced in a source restraining mode.

(2) The fuse is arranged on the module assembly externally and is arranged between the sampling chips, the problem that the sampling chips are damaged due to the fuse is solved, and the fuse is convenient to maintain.

(3) The topology of the sampling chips on the same battery daughter board is consistent with the high-voltage topology of the power battery. The problem of when arranging according to battery module, probably there is the module that different sampling chips of same battery daughter board correspond not to link to each other, produce transient state high pressure when connecting, cause the sampling chip to damage is solved.

The embodiment of the invention also provides driving equipment, which comprises the power battery in any embodiment.

The driving device provided by the embodiment of the present invention includes the power battery in the above embodiment, so the driving device provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not repeated herein.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. The power battery is characterized by comprising a high-voltage system, a low-voltage system and a module assembly;

2. The power cell of claim 1, wherein the distributed battery management system controller comprises a master controller, a first slave controller, and a second slave controller; the first slave controller and the second slave controller are electrically connected with the master controller through the connecting wire harness;

3. The power battery of claim 2, wherein the fuse is disposed between two of the sampling chips.

4. The power cell of claim 2, wherein the high voltage system comprises at least one first hardened copper bar and at least one second hardened copper bar;

5. The power battery according to claim 2, wherein the preset number of the battery modules collected by one sampling chip are adjacently arranged.

6. The power battery of claim 1, wherein the high voltage system further comprises a high voltage distribution box, a first soft copper bar, a second soft copper bar, a third soft copper bar, a fourth soft copper bar, a fifth soft copper bar, and a sixth soft copper bar;

7. The power battery of claim 1, wherein the high voltage system further comprises a third plurality of hardened copper bars, a fourth plurality of hardened copper bars, a fifth plurality of hardened copper bars, and a sixth plurality of hardened copper bars;

8. The power battery according to claim 2, wherein the module assembly comprises n battery modules, and the first slave controller and the second slave controller each contain m sampling chips; each sampling chip collects the electric quantity information of p battery modules, wherein p is more than or equal to n, and n, m and p are integers more than or equal to 1.

9. The power battery of claim 8, wherein the module assembly includes 24 battery modules; the first slave controller and the second slave controller respectively comprise 4 sampling chips; every sampling chip gathers 3 the electric quantity information of battery module.

10. A steering device, characterized in that it comprises a power battery according to any one of the preceding claims 1 to 9.