CN107134558B

CN107134558B - Battery module and notebook computer

Info

Publication number: CN107134558B
Application number: CN201610114372.6A
Authority: CN
Inventors: 周燕飞
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2016-02-29
Filing date: 2016-02-29
Publication date: 2020-02-04
Anticipated expiration: 2036-02-29
Also published as: CN107134558A

Abstract

The invention discloses a battery module, a battery and a notebook computer, wherein the battery module comprises a battery core, a protection circuit board, a battery protection chip and a safety device, the safety device comprises a first pin, a second pin and a third pin, the safety device comprises an insulating heat-conducting substrate attached to the battery core, the first pin and the second pin are arranged on the insulating heat-conducting substrate at intervals and are electrically connected through a safety fuse, the insulating heat-conducting substrate is also connected with a heating module, the third pin is electrically connected with the heating module, the first pin and the second pin are connected in series in a charging and discharging main loop of the battery core, and the third pin is electrically connected with the battery protection chip. Thereby realizing controllable protection such as overcurrent, overtemperature, overcharge and the like. Therefore, the circuit is simplified through the safety device, the using amount of electronic elements is reduced, the area of the protection circuit board can be further reduced, the design is more flexible, and the electronic device, particularly a notebook and the like, is small and light.

Description

Battery module and notebook computer

Technical Field

The invention relates to the field of batteries, in particular to a battery module and a notebook computer using the same.

Background

With the wide use of various electronic devices, the electric core is of great importance as an energy provider. For example, a notebook battery generally uses a lithium ion battery as a power source, wherein the lithium ion battery has the characteristics of high energy density and light weight. Due to the product characteristics of lithium ion batteries, the batteries need to be protected against charge, discharge, temperature, etc. to ensure safety during use.

Conventionally, a cell is protected from overcharge, overdischarge, overcurrent, short circuit, and the like. For example, a notebook battery generally needs to use a temperature switch close to the battery to form a secondary protection with a safety device disposed on a protection circuit board. The existing safety device has three pins, two of which are connected in series with the battery, and one pin is used for connecting the heating circuit and the battery protection chip. In this way, the protection achieved is as follows: 1. when the temperature of the battery rises, the temperature switch tightly attached to the battery can sense the temperature, and when the temperature reaches the trigger temperature of the temperature switch, the temperature switch is started to disconnect the circuit, so that the temperature protection is realized; 2. when the battery is overcharged and an overvoltage state occurs, the protection chip outputs a voltage signal so as to control the fusing safety device to realize overcharge protection.

Above-mentioned prior art, though can play the protection to the overcurrent of battery, excess temperature and overcharge, temperature switch and safeties play respective effect, and these two kinds of component functions are independent, single, need use simultaneously just can realize lithium ion battery's protection to can lead to the increase of battery product cost and space to occupy. With the social development and the improvement of technology, users increasingly need products with lightness, thinness and high cost performance, so that innovation needs to be performed on product technology, and breakthrough of volume reduction and cost reduction is achieved.

Disclosure of Invention

An object of the present invention is to provide a battery module which is compact and has protection performance for controllable protection such as overcurrent and over-temperature, and overcharge at the same time.

Another object of the present invention is to provide a notebook computer, which uses the battery module provided by the present invention.

In order to achieve the above object, according to an aspect of the present invention, a battery module is provided, which includes a battery cell, a protection circuit board, and a battery protection chip disposed on the protection circuit board, and further includes a safety device, where the safety device includes a first pin, a second pin, and a third pin, the safety device includes an insulating heat-conducting substrate attached to the battery cell, the first pin and the second pin are disposed on the insulating heat-conducting substrate at an interval and electrically connected through a safety fuse, the insulating heat-conducting substrate is further connected to a heating module, the third pin is electrically connected to the heating module, where the first pin and the second pin are connected in series in a charge-discharge main loop of the battery cell, and the third pin is electrically connected to the battery protection chip.

Optionally, an MOS transistor located on the protection circuit board is disposed between the third pin and the battery protection chip.

Optionally, the first pin is directly connected to an electrode terminal of the battery cell.

Optionally, the first pin, the fuse and the second pin are attached to the first side surface of the insulating heat-conducting substrate in a manner of extending along a length direction, the third pin extends perpendicular to the length direction and is attached to the second side surface of the insulating heat-conducting substrate opposite to the first side surface together with the heating module, the second pin is connected to the circuit protection board through a connector, and the third pin is directly connected to the protection circuit board.

Optionally, the fuse includes a fuse body and a flux coated on the fuse body.

Optionally, the melting point of the fuse wire is 65-100 ℃.

Optionally, the fuse is encapsulated on the insulating and heat conducting substrate through an insulating layer.

Optionally, the fuse is formed as a sheet structure attached to the insulating and heat-conducting substrate.

Optionally, a pair of substrate electrodes disposed at intervals is disposed on the first side of the insulating and heat conducting substrate, the first pin and the second pin are respectively connected to the substrate electrodes, and the fuse is connected between the pair of substrate electrodes.

Optionally, the first pins and the second pins are respectively formed into a sheet structure attached to the first side surface of the insulating and heat-conducting substrate, and the heating module and the third pins are respectively formed into a sheet structure attached to a second side surface of the insulating and heat-conducting substrate opposite to the first side surface.

According to another aspect of the invention, a notebook computer is provided, and the battery module provided by the invention is mounted on the notebook computer.

Through above-mentioned technical scheme, the attached insulating heat conduction base plate in electric core can respond to the temperature of electric core in real time at the during operation to make fuse fusing through conduct the fuse with the temperature, realize the excess temperature protection to the battery promptly. Meanwhile, the fuse can be fused when the current is too large, so that the overcurrent protection function is realized. In addition, the heating module connected through the third pin can receive a control signal of the battery protection chip and is controlled to generate heat to fuse the fuse, so that the controllable protection of overcharge and the like of the battery is realized. Like this, through safeties, can simplify the circuit design of battery, reduce electronic component's use amount for the area of protection circuit board can further reduce, and the design is more nimble, is favorable to the battery module and uses the small-size lightweight of notebook computer of this battery module.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an exploded view of a safety device according to one embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a battery module according to an embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

As shown in fig. 1 to 3, one embodiment of the present invention provides a battery module and a notebook computer using the battery module. The battery module includes a cell B, a protection circuit board P, and a battery protection chip U1 disposed on the protection circuit board P, where the cell B may be multiple cells connected in series, for example, three cells, i.e., a first cell B1, a second cell B2, and a third cell B3 in this embodiment. In order to achieve the purpose of the present invention, the battery module further includes a safety device SCF, where the safety device SCF includes a first pin 1, a second pin 2, and a third pin 3, the safety device SCF includes an insulating heat-conducting substrate 4 for attaching to the battery core B, the first pin 1 and the second pin 2 are disposed on the insulating heat-conducting substrate 4 at intervals and electrically connected through a safety fuse 5, the insulating heat-conducting substrate 4 is further connected to a heating module 6, and the third pin 3 is electrically connected to the heating module 6. Wherein first pin 1 and second pin 2 establish ties in electric core B's charge-discharge major loop to make safeties SCF can cut off electric core B's charge-discharge major loop, thereby protect the battery module. In addition, the third pin 3 may be electrically connected to the battery protection chip U1.

In this way, the insulating and heat-conducting substrate 4 attached to the battery cell B can sense the temperature of the battery cell B in real time at the time of operation, so that the fuse 5 is blown out by conducting the temperature to the fuse 5, that is, over-temperature protection of the battery is realized. At the same time, the fuse 5 can be blown out when the current is excessive, and an overcurrent protection function can be provided. In addition, the heating module 6 connected through the third pin can receive the control signal of the battery protection chip U1 to generate heat under control to blow the fuse 5, thereby realizing controllable protection such as overcharge of the battery. Therefore, through the safety device, the circuit design of the battery can be simplified, the using amount of electronic elements is reduced, the area of the protection circuit board P can be further reduced, the design is more flexible, and the battery module and the notebook computer using the battery module are favorable for being small and light.

It should be noted that, in the present invention, the charge and discharge main circuit of the battery cell is connected between the positive electrode and the negative electrode of the corresponding battery cell B to implement charge and discharge operations of the battery cell B, wherein the first pin 1 and the second pin 2 may be connected at any position in the charge and discharge main circuit in various manners, for example, in the present embodiment, the first pin 1 is electrically connected to an electrode terminal of the battery cell B, the second pin 2 is electrically connected to the protection circuit board P, that is, the safety device SCF is connected in series between the battery cell B and the protection circuit board P, and at this time, a part of the circuit in the protection circuit board P may be used as a part of the charge and discharge circuit of the. In other embodiments, the second pin 2 may also be used to be directly electrically connected to a load, and in an embodiment in which a plurality of cells are connected in series, the second pin may also be electrically connected to an electrode terminal of an adjacent cell.

The material of the insulating and heat conducting substrate 4 of the safety device provided by the invention can be any material with insulating and heat conducting functions known in the art, such as ceramics. Therefore, the function of insulation and heat conduction is realized on the basis of being used as a carrier of other devices, so that the temperature of the battery cell can be efficiently transferred to the fuse 5. In addition, the safety device provided by the invention can be applied to other devices to be protected besides the battery field, that is, the insulating heat-conducting substrate 4 is used for attaching the devices to be protected. In addition, the battery provided by the invention can be used for other electronic equipment besides a notebook computer.

In addition, in the present embodiment, in order to secure the performance temperature of the over-temperature protection in the present invention, the fuse 5 includes a fuse body and a flux coated on the fuse body. The flux may be a material having a flux function known in the art, such as rosin, so that the fuse 5 can be fused by rapidly sensing an external temperature. The fuse 5 in the embodiment of the present invention has a low melting point, for example, a melting point of 65 to 100 ℃, for example, 75 ℃, which is different from the melting point of the fuse in the prior art, which is usually more than 200 ℃. The design is determined according to the arrangement of the safety device attached to the belt protection component in the concept of the invention. Too high a melting point may affect the fuse function by self-sensing temperature, while too low a melting point may cause the electronic device to fail to operate properly or may make solder mounting work difficult. The melting point may be a characteristic of the material of the fuse body itself or a characteristic of melting by the flux.

In order to protect the fuse wire 5, in particular the flux-coated fuse body, the fuse wire 5 is optionally encapsulated on an insulating heat-conducting substrate 4 by an insulating layer 7. The insulating layer may be made of epoxy resin or the like, and may be formed in a flat lid-like structure to protect the fuse 5. In addition, in the present embodiment, in order to facilitate mounting of the fuse, the fuse may be formed in a sheet-like structure attached to the insulating and heat-conducting substrate 4. Therefore, the fuse can be fused quickly, the safety device can be attached to the insulating heat-conducting substrate 4 more conveniently, and the size in the thickness direction is reduced.

In addition, as shown in fig. 2, the heat generating module 6 is formed in a sheet-like structure attached to the insulating and heat-conducting substrate 4. The first pin 1, the second pin 2 and the third pin 3 may also be respectively formed as a sheet structure attached to the insulating and heat-conducting substrate 4. Wherein, as an exemplary embodiment, the first pin 1 and the second pin 2 and the fuse are attached to a first side of the insulating and heat-conducting substrate, and the heat generating module 6 and the third pin 3 are attached to a second side of the insulating and heat-conducting substrate 4 opposite to the first side. Through the design of the sheet structures, the safety device provided by the invention is easier to attach to a device to be protected, such as the outer surface of a battery cell, during installation, and has a thinner thickness. So as to be beneficial to the miniaturization and the light weight of the electronic equipment.

As shown in fig. 2, a pair of substrate electrodes 41 are disposed on the first side of the insulating and heat-conducting substrate 4 at intervals, the first lead 1 and the second lead 2 are respectively connected to the substrate electrodes 41, and the fuse is connected between the pair of substrate electrodes 41. For example by soldering. Thereby making the circuit operate stably. The heat generating module 6 may be a device that can generate heat by being energized, such as a PTC (semiconductor material or component having a large positive temperature coefficient) or other heat generating circuit. Thus, the fuse 5 can be heated rapidly and controlled to blow after receiving the electric signal.

As shown in fig. 2, in order to optimize the layout, since the safety device SCF is attached to the cell B, the first pin 1 may be directly connected to the electrode terminal of the cell B. In addition, the first pin 1 and the second pin 2 may extend along a length direction of the insulating and heat-conducting substrate 4, and the third pin 3 may be arranged perpendicular to the length direction, so as to be connected with other lines, thereby avoiding the problems of line winding and the like. Specifically, as shown in fig. 1, the second pin 2 is connected to the line protection board P through a connector L, and the third pin is directly connected to the line protection board P. Different structures can be selected by the connecting piece L according to actual disclosure, for example, the connecting piece structure perpendicular to the second pin 2 in fig. 1 is adopted, so that the second pin 2 is conveniently connected with the line protection board P, and then corresponding work, such as power supply and charging of a battery, is realized through a circuit on the line protection board P. In other embodiments, the specific structure and arrangement of the first pin 1, the second pin 2, the fuse 5 and the substrate electrode 41 may depend on the application environment, for example, the second pin 2 is directly formed as an inflection structure connected to the protection circuit board P.

As shown in fig. 3, in the present embodiment, three battery cells B are connected in series. A first FUSE1 is arranged between the first cell B1 and the second cell B2, and a second FUSE2 is arranged between the second cell B2 and the third cell B3, so as to prevent overcurrent from occurring between the batteries, and the FUSE SCF provided by the invention is connected to the positive electrode side of the third cell B3. In other embodiments, the invention may connect the safety device SCF between the second cell B2 and the third cell B3, in particular affixed to the second cell B2. This is because the heat dissipation environment of the second cell B2 located between the two cells is generally poor, and thus the problem of excessive temperature is likely to occur. In some embodiments, the safety device SCF may be attached to the cell close to the heat generating source, also depending on the internal structure. In other embodiments, a fuse SCF may also be attached to each cell. It is intended that all such variations fall within the scope of the present invention.

In this embodiment, the protection circuit board P and the battery protection chip U1 are all devices known in the art, the battery protection chip U1 may have ports such as VDD, SENSE, VC1, VC2, VC3, VSS, CTL, and CO, and the type, number, and connection manner of the ports may be determined according to the type and number of the battery cells, which is not limited in the present invention. In the present embodiment, the protection circuit board P may be provided with a plurality of filter capacitors C1, C2, C3, C4, and a plurality of resistors R1, R2, R3, R4, as needed, to realize the functions of voltage detection, input, output, and the like of the battery protection chip U1.

As shown in fig. 3, in the present embodiment, a MOS transistor Q1 located on the protection circuit board P is provided between the third pin 3 and the battery protection chip U1 in order to control the controlled fusing function of the fuse. Specifically to the CO terminal of the battery protection chip U1. The MOS transistor is a well-known component in the art and will not be described in detail herein. Wherein, this MOS pipe is located the off-state under the normal operating condition, and when overcharge scheduling problem appears in the battery, battery protection chip U1 can be to the MOS pipe output corresponding signal of telecommunication time, for example shift the low level with the high level of CO end, thereby can make the MOS pipe be in the on-state, then can realize the power supply to heating module 6, make safeties 5 of safeties like this and fuse under heating module 6's heat effect, thereby realize controllable fusing function.

The operation of the battery module is described in detail below.

In normal operation, the multi-function fuse SCF is not activated, and the first pin 1 and the second pin 2 are in a connected state.

Overcurrent protection: when the current passing through the circuit exceeds the rated current of the safety device SCF for a period of time, the safety fuse 5 between the first pin 1 and the second pin 2 is fused, and the circuit is disconnected, so that the safety of the battery is ensured.

And (3) overtemperature protection: when the battery core B is abnormal and the temperature of the battery rises, at the moment, the insulating heat-conducting substrate 4 of the safety device SCF tightly attached to the battery core B can sense the temperature of the battery core B and transmit the temperature to the safety fuse 5 between the first pin 1 and the second pin 2, and after the temperature exceeds a specification value, the safety fuse 5 is fused, and a circuit is disconnected, so that the safety of the battery is ensured.

And (3) overcharge protection: when charging for electric core, battery protection chip U1 is monitoring electric core B's voltage, when voltage surpassed battery protection chip U1's protective value, battery protection chip U1 can become the low level to the high level of CO end, MOS pipe conduction this moment, can directly add electric core B's EB + voltage to the inside module 6 that generates heat of safeties SCF like this, thus, continuously generate heat through module 6 that generates heat, and heat conduction through insulating heat conduction base plate 4 and fuse 5 completely of insurance fuse, make electric core and external circuit cut off, thereby make electric core no longer continue to charge, make electric core no longer continue to worsen, thereby battery safety has been protected.

And (4) other protections: since the high-low level change of the CO can be controlled through the setting in the battery protection chip U1, the fusing of the fuse SCF is controlled, the application of the battery can be expanded, and the function of needing the disconnection of the battery circuit can be defined. If the battery is seriously unbalanced, the battery is disassembled, recombined and replaced, the battery capacity is low and the like, the control end fusing safety device SCF can be started, so that the use safety of the battery core is ensured.

While the invention has been described in detail with reference to the drawings, the invention is not limited to the details of the embodiments, and various modifications can be made within the technical spirit of the invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. A battery module comprises a battery core (B), a protection circuit board (P) and a battery protection chip (U1) arranged on the protection circuit board (P), and is characterized in that the battery module further comprises a safety device (SCF) which comprises a first pin (1), a second pin (2) and a third pin (3), the safety device (SCF) comprises an insulating heat-conducting substrate (4) attached to the battery core (B), the first pin (1) and the second pin (2) are arranged on the insulating heat-conducting substrate (4) at intervals and are electrically connected through a fuse (5), the insulating heat-conducting substrate (4) is further connected with a heating module (6), the third pin (3) is electrically connected with the heating module (6), wherein the first pin (1) and the second pin (2) are connected in series in a charging and discharging main loop of the battery core (B), the third pin (3) is electrically connected with the battery protection chip (U1);

the first pins (1) and the second pins (2) are respectively formed into a sheet structure attached to a first side face of the insulating heat-conducting substrate (4), and the heating modules (6) and the third pins (3) are respectively formed into a sheet structure attached to a second side face, opposite to the first side face, of the insulating heat-conducting substrate (4).

2. The battery module according to claim 1, wherein a MOS transistor (Q1) on the protection wiring board (P) is provided between the third pin (3) and the battery protection chip (U1).

3. The battery module according to claim 1, characterized in that the first pin (1) is directly connected with an electrode terminal of the battery cell (B).

4. The battery module according to claim 1, wherein the fuse (5) comprises a fuse body and flux coated on the fuse body.

5. The battery module according to claim 1 or 4, wherein the fuse (5) has a melting point of 65-100 ℃.

6. The battery module according to claim 1 or 4, characterized in that the fuse (5) is encapsulated on the insulating and heat-conducting substrate (4) by an insulating layer (7).

7. The battery module according to claim 1, wherein the fuse is formed in a sheet structure attached to the insulating and heat-conducting substrate (4).

8. The battery module according to claim 1 or 7, wherein a pair of substrate electrodes (41) are disposed on the first side of the insulating and heat-conducting substrate (4) at intervals, the first lead (1) and the second lead (2) are respectively connected to the substrate electrodes (41), and the fuse is connected between the pair of substrate electrodes (41).

9. The battery module according to claim 3, wherein the first pin (1), the fuse (5) and the second pin (2) are attached to a first side surface of the insulating and heat-conducting substrate (4) in a manner of extending along a length direction, the third pin (3) extends perpendicular to the length direction and is attached to a second side surface of the insulating and heat-conducting substrate (4) opposite to the first side surface together with the heat-generating module (6), the second pin (2) is connected to the circuit protection board (P) through a connector (L), and the third pin (3) is directly connected to the protection circuit board (P).

10. A notebook computer, wherein the battery module according to any one of claims 1 to 9 is mounted on the notebook computer.