WO2020199237A1

WO2020199237A1 - Battery module with wireless communication function and battery pack

Info

Publication number: WO2020199237A1
Application number: PCT/CN2019/082073
Authority: WO
Inventors: 刘贵生; 丁浩; 刘志钢; 孙鹏; 王天旭; 李秋影
Original assignee: 北斗航天汽车（北京）有限公司
Priority date: 2019-04-01
Filing date: 2019-04-10
Publication date: 2020-10-08
Also published as: CN109888145A

Abstract

The present invention relates to the technical field of battery packs for use in electric vehicles, and particularly relates to a battery module with a wireless communication function and battery pack, comprising battery module units, a working parameter detection module, a wireless communication receiving chip, and a wireless communication transmission chip; the working parameter detection module is electrically connected to the wireless communication transmission chip by means of a signal line; and the wireless communication transmission chip is electrically connected to the wireless communication receiving chip by means of a signal line; by means of arranging the wireless communication transmission chip and the wireless communication receiving chip between the battery module units, the battery module with a wireless communication function and the battery pack disclosed in the present invention eliminate the low voltage acquisition wiring harness inside the battery pack and replace same with wireless communication, saving space in the pack and lightening the total weight of the battery pack, and also eliminating the wiring harness constraints, allowing the acquisition and communication modules to be arranged in more suitable positions.

Description

Battery module and battery pack with wireless communication function

Technical field

The invention relates to the technical field of battery packs for electric vehicles, in particular to a battery module and battery pack with wireless communication functions.

Background technique

In recent years, pure electric vehicles have made considerable progress. All countries and enterprises are vigorously developing and implementing pure electric vehicles throughout the country and the world. The important role of the battery pack as an energy output mechanism on a pure electric vehicle is self-evident.

The power battery needs to arrange nearly 100 groups of batteries in a space of less than 1m ³ (the voltage of the lithium battery is 3~4V, the battery pack needs to output 400V voltage, and more than 100 groups need to be connected in series), and each group of batteries needs to collect voltage and collect temperature , The entire package also needs to collect current, and there are high and low voltage control equipment, cut-off equipment and management equipment. These complex devices need wiring harnesses to connect. All the wiring harnesses in the entire battery package add up to nearly 100 meters. Nearly a hundred are needed for terminal plugs, etc.

In the design process of the battery pack, it is a systematic and complicated project to arrange the direction of the low-voltage communication wiring harness, the fixed point of the wiring harness, the fixed mechanism of the wiring harness, and the connection method of the collection point. At the same time, corresponding to the arrangement of the wiring harness, the corresponding components produced for the service wiring harness also occupy a larger space and higher quality in the battery.

If the low-voltage communication harness in the battery pack can be eliminated and turned into wireless communication, it will save a lot of design time and development cost, and at the same time will increase the volume/weight energy density of the battery pack, making the arrangement of the battery cells more convenient.

Therefore, in order to solve the above problems, there is an urgent need to invent a new battery module and battery pack with wireless communication function.

Summary of the invention

The purpose of the present invention is to provide a battery module and battery pack with wireless communication function. Low-voltage communication adopts wireless communication (including voltage acquisition, temperature acquisition, etc.), which can save wiring harness costs, release the space occupied by the wiring harness, and reduce the structure The complexity of the design.

The present invention provides the following solutions:

A battery module with wireless communication function includes a battery module unit, a working parameter detection module electrically connected to the battery module unit for real-time detection of the working parameters of the battery module unit, and a wireless A wireless communication receiving chip for receiving the working parameters of the battery module unit and a wireless communication sending chip for wirelessly transmitting the working parameters of the battery module unit; the working parameter detection module communicates with the wireless communication sending chip via a signal line Connection; The wireless communication sending chip and the wireless communication receiving chip are electrically connected through a signal line.

Preferably, the battery module with wireless communication function further includes a power supply voltage stabilizing module connected in parallel with the battery module unit via a power supply line, and the power supply voltage stabilizing module detects the working parameters through the power supply line and The module, the wireless communication sending chip and the wireless communication receiving chip are electrically connected.

Preferably, the working parameter detection module includes a voltage sensor for detecting the output voltage of the battery module unit and a temperature sensor for detecting the temperature of the battery module unit connected in parallel to the output end of the battery module unit, the The voltage sensor and the temperature sensor are respectively electrically connected to the wireless communication sending chip through a signal line; the voltage sensor and the temperature sensor are respectively electrically connected to the power supply voltage stabilizing module through a power supply line.

Preferably, the voltage sensor, the temperature sensor, the wireless communication transmitting chip and the wireless communication receiving chip are integrally arranged on the same PCB board.

Further, the present invention also provides a battery pack with wireless communication function, which includes a plurality of battery modules with wireless communication function arranged in sequential intervals, and also includes a battery pack for detecting and receiving each of the battery modules. The battery manager of the operating parameters of the group unit; the battery manager respectively communicates with the wireless communication receiving chip on the first battery module unit and the wireless communication on the last battery module unit The transmitting chip is electrically connected by wireless signals; the wireless communication transmitting chip on one of the battery module units and the wireless communication receiving chip on the other battery module unit adjacent to it in sequence are electrically connected by wireless signals. Connection, and in this way, the operating parameters of the battery module units are sequentially transmitted between the battery module units.

Preferably, the battery pack with wireless communication function further includes a current sensor arranged on the power supply line of the battery pack, and the current sensor is electrically connected to the power manager through a signal line.

Preferably, the current sensor and the power manager are electrically connected by wireless signals.

Preferably, the wireless communication receiving chip and the wireless communication sending chip are of the same type.

Preferably, the wireless communication receiving chip is any one of an infrared wireless communication receiving chip and an NFC wireless communication receiving chip.

Preferably, the wireless communication sending chip is any one of an infrared wireless communication sending chip and an NFC wireless communication sending chip.

The beneficial effects produced by the present invention:

1. The battery module and battery pack with wireless communication function disclosed in the present invention include a battery module unit, and a device electrically connected to the battery module unit for real-time detection of the operating parameters of the battery module unit A working parameter detection module, a wireless communication receiving chip for wirelessly receiving the working parameters of the battery module unit, and a wireless communication sending chip for wirelessly sending the working parameters of the battery module unit; the working parameter detecting module is through a signal line Is electrically connected to the wireless communication sending chip; the wireless communication sending chip and the wireless communication receiving chip are electrically connected through a signal line; by setting the wireless communication sending chip and the wireless communication receiving chip between the battery module units Chip, the low-voltage collection harness inside the battery pack is cancelled and replaced with wireless communication, which saves the space in the pack and reduces the total weight of the battery pack; at the same time, get rid of the wire constraints, and the collection and communication modules can be arranged in more suitable positions.

2. The wireless communication sending chip adopts the NFC wireless communication sending chip, the wireless communication receiving chip adopts the NFC wireless communication receiving chip; the near field communication is selected as the wireless transmission medium (NFC), which is a non-contact radio frequency identification ( RFID) and interconnection technology integration evolved, through the integration of inductive readers, inductive cards and point-to-point communication functions on a single chip; the reasons for choosing NFC are: first, the technology maturity is very high, along with In the use of mobile scenarios, the current cost of NFC is very low and the degree of reliability is very high. Second, it runs at a distance of 20 cm at 13.56MHz. Its transmission speed can reach up to 424Kbit/sec, which meets the current requirement of 250Kbit baud rate for the CAN protocol in the battery pack. Third, the power consumption is very low, and a single NFC chip consumes only 20μA under full operating conditions, which will not increase the additional power consumption of the battery pack.

Description of the drawings

Fig. 1 is a structural block diagram of a battery module with wireless communication function of the present invention.

Fig. 2 is a structural block diagram of the battery pack with wireless communication function of the present invention.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be understood in specific situations.

Example one

As shown in FIG. 1, a battery module with wireless communication function includes a battery module unit, and working parameters electrically connected to the battery module unit for real-time detection of working parameters of the battery module unit A detection module, a wireless communication receiving chip for wirelessly receiving the working parameters of the battery module unit, and a wireless communication sending chip for wirelessly transmitting the working parameters of the battery module unit; the working parameter detection module communicates with the battery module unit via a signal line The wireless communication sending chip is electrically connected; the wireless communication sending chip and the wireless communication receiving chip are electrically connected through a signal line. The battery module with wireless communication function further includes a power supply voltage stabilizing module connected in parallel with the battery module unit through a power supply line, and the power supply voltage stabilizing module is connected to the working parameter detection module and the working parameter detection module through the power supply line respectively. The wireless communication sending chip and the wireless communication receiving chip are electrically connected. The working parameter detection module includes a voltage sensor for detecting the output voltage of the battery module unit and a temperature sensor for detecting the temperature of the battery module unit connected in parallel to the output end of the battery module unit, the voltage sensor and The temperature sensor is electrically connected to the wireless communication sending chip through a signal line; the voltage sensor and the temperature sensor are electrically connected to the power supply voltage stabilizing module through a power supply line, respectively. The voltage sensor, the temperature sensor, the wireless communication transmitting chip and the wireless communication receiving chip are integratedly arranged on the same PCB board. The wireless communication receiving chip is an NFC wireless communication receiving chip. The wireless communication sending chip is an NFC wireless communication sending chip.

The battery module with wireless communication function in this embodiment includes a battery module unit, and a working parameter detection module electrically connected to the battery module unit for real-time detection of working parameters of the battery module unit , A wireless communication receiving chip for wirelessly receiving the operating parameters of the battery module unit and a wireless communication sending chip for wirelessly transmitting the operating parameters of the battery module unit; the operating parameter detection module communicates with the wireless The communication sending chip is electrically connected; the wireless communication sending chip and the wireless communication receiving chip are electrically connected through a signal line; by setting the wireless communication sending chip and the wireless communication receiving chip between the battery module units, the battery The low-voltage collection wiring harness inside the package is cancelled and replaced with wireless communication, which saves space in the package and reduces the total weight of the battery package; at the same time, get rid of the wire constraints, and the collection and communication modules can be arranged in more suitable positions.

In the battery module with wireless communication function in this embodiment, the wireless communication sending chip adopts the NFC wireless communication sending chip, and the wireless communication receiving chip adopts the NFC wireless communication receiving chip; select near field communication as the wireless transmission Media (NFC), NFC is evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technology, through the integration of inductive card reader, inductive card and point-to-point communication functions on a single chip; choose NFC The reason is that, first, the technology maturity is very high. With the use in mobile scenarios, the current NFC cost is very low and the reliability is very high. Second, it runs at a distance of 20 cm at 13.56MHz. Its transmission speed can reach up to 424Kbit/sec, which meets the current requirement of 250Kbit baud rate for the CAN protocol in the battery pack. Third, the power consumption is very low, and a single NFC chip consumes only 20μA under full operating conditions, which will not increase the additional power consumption of the battery pack.

For the battery module with wireless communication function in this embodiment, the original low-voltage communication working mode of the battery pack is to connect all contact points with the BMS in the pack, and the BMS is fixed at the designated position in the pack. The harnesses are gathered here. On the one hand, digital signals are transmitted, and analog signals are also transmitted (voltage, current, that is, analog signals are transmitted to the BMS main control board for processing). The transmission of digital signals can be directly changed to wireless transmission, but the transmission of analog signals requires certain processing.

In the battery module with wireless communication function described in this embodiment, each string of battery modules is equipped with a PCB board, on which is equipped with LTC6811 (voltage sensor) to collect voltage, and at the same time, power is taken from both ends of a string of batteries and stabilized After the power source, the entire PCB is powered, and the temperature analog signal is collected at the same time, which is converted into an electrical signal by the analog-electric circuit, and the voltage/temperature information on the entire board is sent to the adjacent lower-level PCB board via the NFC chip. Equipped with a PCB board at the current collection place at the same time, the board voltage is taken from the adjacent module, the current analog signal is collected by the Hall sensor, and converted into a digital signal through the MLX91208, which is transmitted downward through the NFC module. At the control end, for the same reason, take power from the module nearby and receive control signals via NFC. The whole system adopts the form of daisy chain (connected at the end). It is not necessary for each module to communicate with the BMS, and each module is only connected to the nearest one, and only one ring is connected to the BMS.

Embodiment 2. This embodiment is improved on the basis of Embodiment 1. The content described in Embodiment 1 is also included in this embodiment, and will not be detailed here.

Referring to Figures 1 to 2, a battery pack with wireless communication function includes a plurality of battery modules with wireless communication function arranged in sequential intervals, and also includes a battery pack for detecting and receiving each battery. The battery manager of the operating parameters of the module unit; the battery manager communicates with the wireless communication receiving chip on the first battery module unit and the wireless communication receiver chip on the last battery module unit. The communication sending chip is electrically connected by a wireless signal; the wireless communication sending chip on one of the battery module units and the wireless communication receiving chip on the other battery module unit adjacent to it in sequence are connected by wireless signals It is electrically connected, and in this way, the operating parameters of the battery module units are sequentially transmitted between the battery module units. The battery pack with wireless communication function further includes a current sensor arranged on the power supply line of the battery pack, and the current sensor is electrically connected with the power manager through a signal line. The current sensor and the power manager are electrically connected by wireless signals. The wireless communication receiving chip and the wireless communication sending chip are of the same type. The wireless communication receiving chip is an NFC wireless communication receiving chip. The wireless communication sending chip is an NFC wireless communication sending chip.

The battery pack with wireless communication function in this embodiment includes a battery module unit, a working parameter detection module electrically connected to the battery module unit for real-time detection of working parameters of the battery module unit, A wireless communication receiving chip for wirelessly receiving the operating parameters of the battery module unit and a wireless communication sending chip for wirelessly transmitting the operating parameters of the battery module unit; the operating parameter detection module communicates with the wireless via a signal line The transmitting chip is electrically connected; the wireless communication transmitting chip and the wireless communication receiving chip are electrically connected through a signal line; by setting the wireless communication transmitting chip and the wireless communication receiving chip between the battery module units, the battery pack The internal low-voltage collection harness is cancelled and replaced with wireless communication, which saves space in the bag and reduces the total weight of the battery pack; at the same time, get rid of the wire constraints, and the collection and communication modules can be arranged in more suitable positions.

In the battery pack with wireless communication function in this embodiment, the wireless communication sending chip adopts the NFC wireless communication sending chip, and the wireless communication receiving chip adopts the NFC wireless communication receiving chip; select near field communication as the wireless transmission medium (NFC), NFC is evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technology, through the integration of inductive readers, inductive cards and point-to-point communication functions on a single chip; reasons for choosing NFC For, first, the technological maturity is very high. With the use in mobile scenarios, the current cost of NFC is very low and the reliability is very high. Second, it runs at a distance of 20 cm at 13.56MHz. Its transmission speed can reach up to 424Kbit/sec, which meets the current requirement of 250Kbit baud rate for the CAN protocol in the battery pack. Third, the power consumption is very low, and a single NFC chip consumes only 20μA under full operating conditions, which will not increase the additional power consumption of the battery pack.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention range.

Claims

A battery module with wireless communication function, characterized in that it comprises a battery module unit, and a working parameter detection module electrically connected to the battery module unit for real-time detection of the working parameters of the battery module unit , A wireless communication receiving chip for wirelessly receiving the operating parameters of the battery module unit and a wireless communication sending chip for wirelessly transmitting the operating parameters of the battery module unit; the operating parameter detection module communicates with the wireless The communication sending chip is electrically connected; the wireless communication sending chip and the wireless communication receiving chip are electrically connected through a signal line.
The battery module with wireless communication function according to claim 1, characterized in that it further comprises a power supply voltage stabilizing module connected in parallel with the battery module unit through a power supply line, and the power supply voltage stabilizing module is respectively connected through a power supply line It is electrically connected with the working parameter detection module, the wireless communication sending chip and the wireless communication receiving chip.
The battery module with wireless communication function according to claim 2, wherein the working parameter detection module comprises a voltage connected in parallel to the output terminal of the battery module unit for detecting the output voltage of the battery module unit A sensor and a temperature sensor for detecting the temperature of the battery module unit, the voltage sensor and the temperature sensor are respectively electrically connected to the wireless communication sending chip through a signal line; the voltage sensor and the temperature sensor respectively pass The power supply line is electrically connected with the power supply voltage stabilizing module.
The battery module with wireless communication function according to claim 3, characterized in that: the voltage sensor, the temperature sensor, the wireless communication transmitting chip and the wireless communication receiving chip are integrated in the same PCB board.
A battery pack with wireless communication function, characterized in that it includes a plurality of battery modules with wireless communication function as described in any one of claims 1-4 arranged in sequential intervals, and further includes a battery pack for detecting and A battery manager that receives the operating parameters of each of the battery module units; the battery manager respectively communicates with the wireless communication receiving chip on the first battery module unit and the battery module unit at the end The wireless communication sending chip on the above is electrically connected by a wireless signal; the wireless communication sending chip on one of the battery module units is connected to the wireless communication on the other battery module unit adjacent to it in sequence The receiving chip is electrically connected by wireless signals, and thereby sequentially transmits the operating parameters of the battery module units among the battery module units.
The battery pack with wireless communication function according to claim 5, further comprising a current sensor arranged on the power supply line of the battery pack, and the current sensor and the power manager are electrically connected through a signal line.
The battery pack with wireless communication function according to claim 6, wherein the current sensor and the power manager are electrically connected by wireless signals.
8. The battery pack with wireless communication function according to claim 7, wherein the wireless communication receiving chip and the wireless communication sending chip are of the same type.
The battery pack with wireless communication function according to claim 8, wherein the wireless communication receiving chip is any one of an infrared wireless communication receiving chip and an NFC wireless communication receiving chip.
The battery pack with wireless communication function according to claim 9, wherein the wireless communication sending chip is any one of an infrared wireless communication sending chip and an NFC wireless communication sending chip.