CN210040356U

CN210040356U - Vehicle-mounted battery module unit

Info

Publication number: CN210040356U
Application number: CN201921388122.7U
Authority: CN
Inventors: 陆珂伟; 杜宇; 周定贤; 陈海平
Original assignee: SAIC Motor Corp Ltd
Current assignee: SAIC Motor Corp Ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-02-07
Anticipated expiration: 2029-08-26

Abstract

The utility model discloses a vehicle-mounted battery module unit, which comprises a plurality of stacked electric cores and a FPC (flexible printed circuit) assembly, wherein each electric core is provided with a positive electrode lug and a negative electrode lug, the voltage of the positive electrode lug is higher than that of the negative electrode lug, and the FPC assembly is arranged above the electric cores and insulated from each electric core; the FPC subassembly includes the FPC main part, the pin, heat-sensitive element, control chip and connector, FPC main part both sides extend has a plurality of pins, these some pins all with FPC main part electrical connection, the terminal welding of the pin of these some pins is on the anodal ear of electric core, heat-sensitive element arranges in pin or FPC main part, heat-sensitive element's one side welding is on the pin, the another side welding is on electric core, control chip arranges in the FPC main part, control chip's pin and the last corresponding return circuit of FPC main part weld mutually, the connector is arranged in the FPC main part, the contact on the connector welds with the corresponding return circuit in the FPC main part mutually.

Description

Vehicle-mounted battery module unit

Technical Field

The utility model belongs to the technical field of electric automobile, in particular to on-vehicle battery module unit.

Background

A complete battery module unit capable of outputting digital signals is composed of a battery core, a high-low voltage wire harness and a control system. The control system is used for monitoring and transmitting the internal state signals of the battery module in real time.

The typical control system design scheme comprises an acquisition system, a connection system and a signal processing system. The acquisition system is usually arranged inside the battery module unit, and directly acquires parameters such as temperature and voltage from the battery core. The acquisition system usually uses a flexible printed circuit board (FPC), so that the complex space in the battery module can be more reasonably utilized, and the space utilization rate and the signal acquisition reliability are improved; the connecting system mainly refers to a wiring harness which is used for outputting signals between the acquisition system and the signal processing system; the signal processing system converts the acquired analog signals into digital signals, stores the digital signals and outputs the digital signals according to external requirements. The scheme is composed of a plurality of components, and is high in cost, long in electric loop and low in reliability and accuracy.

Another alternative control system design is comprised of a wiring harness and a signal processing system. In the scheme, one end of the wire harness is integrated with related electronic components (such as a thermistor and the like) and is welded on the battery core or the high-voltage loop, and the other end of the wire harness is butted with the signal processing system. And the signal processing system receives the data monitored on the wire harness, converts the data into digital signals for storage, and outputs the digital signals to the outside according to external requirements. The control system may be disposed outside or inside the battery module unit. The technical scheme has the advantages that the components are relatively reduced, the structure is simple, the reliability is high, but the wiring harness is adopted in the module unit to collect signals, the space utilization rate is low, and the energy density of the battery module is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that prior art exists with not enough, provide a novel on-vehicle battery module unit.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

the utility model provides a vehicle-mounted battery module unit, which is characterized in that the vehicle-mounted battery module unit comprises a plurality of stacked electric cores and a FPC (flexible printed circuit) assembly, wherein each electric core is provided with a positive electrode lug and a negative electrode lug, the voltage of the positive electrode lug is higher than that of the negative electrode lug, and the FPC assembly is arranged above the electric cores and is insulated from each electric core;

the FPC subassembly includes the FPC main part, the pin, heat-sensitive element, control chip and connector, FPC main part both sides extend has a plurality of pins, these some pins all with FPC main part electrical connection, the terminal welding of the pin of these some pins is on the anodal ear of electric core, heat-sensitive element arranges in pin or FPC main part, heat-sensitive element's one side welding is on the pin, the another side welding is on electric core, control chip arranges in the FPC main part, control chip's pin and the last corresponding return circuit of FPC main part weld mutually, the connector is arranged in the FPC main part, the contact on the connector welds with the corresponding return circuit in the FPC main part mutually.

Preferably, the positive tab and the negative tab are both formed by compounding a film and a metal strip, the metal strip of the positive tab is made of aluminum, and the metal strip of the negative tab is made of nickel or copper plated with nickel.

Preferably, the FPC assembly is fixed above the battery cells by a double-sided adhesive tape.

Preferably, the FPC main body adopts a single-layer flexible circuit board, the FPC main body is composed of an upper layer PI film, a middle copper layer and a lower layer PI film, the upper layer PI film and the lower layer PI film are made of polyimide, the middle copper layer is made of pure copper, the middle copper layer is attached to the lower layer PI film, and the upper layer PI film is pressed on the middle copper layer.

Preferably, the pins are nickel sheets, one ends of the pins are welded on a middle copper layer of the FPC main body and are coated by an upper layer PI film or a lower layer PI film of the FPC main body, and the tail ends of the pins are welded on the positive lugs of the battery core.

Preferably, the connector is disposed at an edge of the FPC body.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses on current basis, simplified current control system's structure and electrical design, reduced the use of pencil and independent collection system in the battery module, improved the space utilization and the energy density of battery module unit, can realize full automated production, reduced manufacturing cost, improved the connection reliability.

The control system only comprises an FPC assembly adopting a flexible printed circuit board, and can be arranged in the battery module unit without occupying the external space of the module; the use of wire harnesses and an independent signal processing system in the battery module is reduced, the utilization rate of the internal space of the battery module is high, and the energy density is greatly improved; the full-automatic production can be realized, and the assembly cost is saved; the connection loop is simplified, and the connection reliability is high.

Drawings

Fig. 1 is a schematic structural diagram of a vehicle-mounted battery module unit according to a preferred embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an electrical core according to a preferred embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the FPC assembly according to a preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the FPC main body according to the preferred embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a thermosensitive element according to a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the present embodiment provides an on-vehicle battery module unit including a battery cell 10, a battery cell 20, a battery cell 30, and an FPC assembly 40, which are stacked.

Each of the

battery cells

10, 20, and 30 is the smallest power unit in the rechargeable battery module unit. As shown in fig. 2, the battery cell 10 has a positive tab 11 and a negative tab 12, the positive tab 11 and the negative tab 12 are contact points when the battery cell is charged and discharged, and the voltage of the positive tab 11 is higher than that of the negative tab 12. When the battery cell 10 discharges, current flows out of the positive electrode tab 11 and flows into the negative electrode tab 12; when the battery cell 10 is charged, current flows in from the positive electrode tab 11 and flows out from the negative electrode tab 12.

The positive tab 11 and the negative tab 12 are both formed by compounding a film and a metal strip, the metal strip of the positive tab 11 is usually made of aluminum (Al) material, and the negative tab 12 is usually made of nickel (Ni) or copper nickel (Ni-Cu) material.

Similarly, the battery cell 20 has a positive tab and a negative tab 22, and the voltage of the positive tab is higher than that of the negative tab 22; the battery cell 30 has a positive tab and a negative tab, and the voltage of the positive tab is higher than that of the negative tab.

As shown in fig. 3, the FPC assembly 40 is disposed above the

battery cells

10, 20, and 30, and the FPC assembly 40 may be fixed to the

battery cells

10, 20, and 30 by a double-sided adhesive tape and insulated from each battery cell.

The FPC assembly 40 includes an FPC main body 41, pins 42, a heat sensitive element 43, a control chip 44, a connector 45, and the like.

The FPC body 41 is preferably a single-layer flexible circuit board, and as shown in fig. 4, is composed of an upper layer PI film 411, an intermediate copper layer 412, and a lower layer PI film 413, and has a simple manufacturing process, high reliability, and low price. The upper PI film 411 and the lower PI film 413 are made of polyimide materials with good insulation and pressure resistance, the middle copper layer 412 is made of pure copper materials, the middle copper layer 412 is attached to the lower PI film 413 through an electroplating process, and the upper PI film 411 is pressed on the middle copper layer 412. FPC body 41 performs an electrical function through an intermediate pure copper layer 412.

The pin 42 is a part of the FPC main body 41, and as shown in fig. 3, partially extends directly from the FPC main body 41, and an extending end 421 of the pin 42 is soldered to the positive tab 11 of the battery cell 10. The extended end 421 is electrically connected to the FPC main body 41.

The pin 42 may also be an independent nickel plate, one end 422 of the pin 42 is soldered to the middle copper layer 412 of the FPC body, the outside of the pin is covered by the upper layer film 411 or the lower layer film 412 of the FPC body 41, and the extending end 421 is soldered to the positive tab 11 of the battery cell 10. One end 422 of the pin 42 is electrically connected to the FPC body 41.

The thermosensitive element 43 is arranged on the pins 42, and as shown in fig. 3 and 5, one face 431 of the thermosensitive element 43 is welded on the extending end 421 of the pins 42 and can be electrically connected with the FPC; the other side 432 of the thermosensitive element 43 is welded on the battery core, and data such as temperature, voltage and the like of the battery core are acquired. The thermosensitive element 43 can also be directly arranged on the FPC body 41, and one surface 431 of the thermosensitive element 43 is welded on the pins and can be electrically connected with the FPC; the other side 432 is welded on the battery cell and used for collecting data such as temperature, voltage and the like of the battery cell.

The control chip 44 is disposed on the FPC main body 41, as shown in fig. 3, and the pins of the control chip 44 are soldered to the corresponding loops on the FPC main body 41, so that signal transmission can be achieved. The control chip 44 can convert analog signals into digital signals, store and transmit data, and communicate, and the above functions can be realized by using common chip types.

The connector 45 is disposed on the FPC main body 41, and as shown in fig. 3, the contacts on the connector 45 are soldered to the corresponding circuit on the FPC main body, and signal transmission is realized. The connectors 45 are typically disposed at the edge of the FPC body 41 to facilitate handling of the connectors.

The working mode of the cell control unit is as follows:

the thermistor 43 collects temperature (or voltage) signals and transmits the signals to the extending end 421 of the pin 42, the pin 42 transmits the signals to the control chip 44 through one end 422 and the FPC body 41, and the control chip 44 converts the collected analog signals into digital signals for storage and then transmits the digital signals to the connector 45 through the FPC body 41 for external output.

The utility model discloses a control system only adopts a FPC subassembly to replace the collection system and the signal processing system in the conventional scheme, has simplified the structure of battery module unit, has simplified production assembling process, can realize full automated production, improves battery module's energy density, improves production efficiency.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A vehicle-mounted battery module unit is characterized by comprising a plurality of stacked battery cores and an FPC assembly, wherein each battery core is provided with a positive electrode tab and a negative electrode tab, the voltage of the positive electrode tab is higher than that of the negative electrode tab, and the FPC assembly is arranged above the battery cores and is insulated from the battery cores;

2. The vehicle-mounted battery module unit according to claim 1, wherein the positive tab and the negative tab are both formed by laminating a film and a metal strip, the metal strip of the positive tab is made of aluminum, and the metal strip of the negative tab is made of nickel or copper plated with nickel.

3. The on-board battery module unit of claim 1, wherein the FPC assembly is secured over the cells by double-sided adhesive.

4. The on-vehicle battery module unit according to claim 1, wherein the FPC body is a single-layer flexible circuit board, and is composed of an upper PI film, an intermediate copper layer, and a lower PI film, the upper PI film and the lower PI film being made of polyimide, the intermediate copper layer being made of pure copper, the intermediate copper layer being attached to the lower PI film, and the upper PI film being laminated on the intermediate copper layer.

5. The on-vehicle battery module unit of claim 4, wherein the pins are nickel plates, one ends of the pins are welded on the middle copper layer of the FPC body and are covered by the upper PI film or the lower PI film of the FPC body, and the tail ends of the pins are welded on the positive lugs of the battery cells.

6. The on-vehicle battery module unit according to claim 1, wherein the connector is disposed at an edge of the FPC main body.