CN211654981U

CN211654981U - Battery protection plate and electronic equipment

Info

Publication number: CN211654981U
Application number: CN202020563281.2U
Authority: CN
Inventors: 王典开
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2020-10-09
Anticipated expiration: 2030-04-16

Abstract

The utility model relates to a battery protection shield and electronic equipment. The battery protection board includes: the circuit board comprises a component arrangement area and a connection area, wherein the connection area is formed by outwards extending one end of the circuit board, which is far away from the component arrangement area, the component arrangement area is provided with electronic components, and the connection area is provided with a connector for connecting an external circuit; and the resistance element is arranged in the connection area. This battery protection board arranges the region with resistive element by the components and parts of circuit board and moves to the connection region of circuit board, can shorten resistive element's the line, saves components and parts and arranges regional occupation space to increase the area of overflowing of the line metal level of walking on the heavy current return circuit, be favorable to improving the temperature rise, satisfy the functional requirement of heavy current charge-discharge.

Description

Battery protection plate and electronic equipment

Technical Field

The utility model relates to a battery technology field especially relates to a battery protection shield and electronic equipment.

Background

With the development of network technologies, electronic devices such as smart phones, tablet computers, wearable devices and the like are increasingly configured, power consumption is continuously increased, and requirements for battery capacity and charging and discharging current are increasingly high. The material of the rechargeable battery determines that the rechargeable battery cannot be overcharged, overdischarged, overcurrent, short-circuited and charged and discharged at ultrahigh temperature, once the short circuit occurs, the battery is ignited slightly and explodes heavily, and therefore the battery is always provided with a circuit protection board with a sampling resistor.

In order to maximize the energy density of the battery, the circuit protection board needs to be small enough to maximize the battery capacity in a limited space. But the electronic component on the circuit protection board walks and can occupy certain space, influences the overcurrent area of walking on the line metal level of heavy current return circuit, leads to impedance bigger than normal, the temperature rise is higher, can't satisfy the functional requirement of heavy current charge-discharge.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery protection shield and electronic equipment, this battery protection shield can shorten or even avoid walking of resistance line, increases the area of overflowing of walking the line metal level on the heavy current return circuit.

On the one hand, the utility model provides a battery protection shield, include: the circuit board comprises a component arrangement area and a connection area, wherein the connection area is formed by outwards extending one end of the circuit board, which is far away from the component arrangement area, the component arrangement area is provided with electronic components, and the connection area is provided with a connector for connecting an external circuit; and the resistance element is arranged in the connection area.

According to an aspect of the utility model, the resistance element is identification resistance and/or temperature detection resistance, and temperature detection resistance includes negative temperature coefficient thermistor and positive temperature coefficient thermistor.

According to one aspect of the present invention, the connection region of the circuit board includes a positive input terminal and a negative input terminal; the connector comprises a connector body, and a power supply positive electrode pin, a power supply negative electrode pin and a signal pin which are connected with the connector body; the positive pin of the power supply is connected with the positive input end, and the negative pin of the power supply is connected with the negative input end.

According to one aspect of the invention, the resistive element is an identification resistor and/or a negative temperature coefficient thermistor; the resistance element is arranged adjacent to the connector in the connecting area, one end of the resistance element is connected with the negative electrode input end, and the other end of the resistance element is connected with the signal pin of the connector through the wiring arranged in the connecting area.

According to one aspect of the invention, the resistive element is an identification resistor and/or a negative temperature coefficient thermistor; the resistor is embedded into the connector body of the connector, one end of the resistor is connected with the negative electrode pin of the power supply, and the other end of the resistor is connected with the signal pin.

According to one aspect of the invention, the resistive element is a positive temperature coefficient thermistor; the resistor element is embedded into the connector body of the connector, one end of the resistor element is connected with the positive input end of the circuit board, and the other end of the resistor element is connected with the power supply positive pin of the connector; or one end of the resistance element is connected with the negative input end of the circuit board, and the other end of the resistance element is connected with the power supply negative pin of the connector.

According to the utility model discloses an aspect, the circuit board is flexible circuit board, and the battery protection shield is still including setting up the reinforcing plate on the circuit board, and the reinforcing plate sets up corresponding to connection region for support connection region.

According to the utility model discloses an aspect, the battery protection shield is still including setting up the backup pad on the circuit board, and the backup pad is arranged regional setting corresponding to components and parts for it arranges region to support components and parts.

According to the utility model discloses an aspect, the circuit board still includes electric core connecting portion, and electric core connecting portion arrange regional side from components and parts and outwards extend for be connected with the battery electricity.

On the other hand, the utility model also provides an electronic equipment, include: the battery protection plate as described above; the battery comprises a battery core and a lug, wherein the lug extends out from one side of the battery core and is electrically connected with the battery protection plate; and the main board is provided with a butting connector, and the butting connector is connected with the connector of the battery protection board.

The utility model provides a pair of battery protection board arranges the region through the components and parts with resistive element by the circuit board and moves the connection region of circuit board, can shorten resistive element's the line of walking, saves components and parts and arranges regional occupation space to increase the area of overflowing of walking the line metal level on the heavy current return circuit, be favorable to improving the temperature rise, satisfy the functional requirement of heavy current charge-discharge.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Fig. 1 is a schematic structural view of a battery protection plate in the prior art;

fig. 2 is a schematic structural diagram of a battery protection plate according to an embodiment of the present invention;

fig. 3 is an enlarged structural view of a region a of the battery protection plate shown in fig. 2;

fig. 4 is a schematic circuit configuration diagram of the battery protection board shown in fig. 2;

fig. 5 is a rear view schematically illustrating the structure of the battery protection plate shown in fig. 2;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Description of reference numerals:

e-a component; l-routing;

1-a battery protection plate; 11-a circuit board; 11 a-component arrangement area; 11 b-a connection region; 111-positive input; 112-negative input; 113-a cell connection;

12-a connector; 120-a connector body; 121-power supply positive pin; 122-power supply negative pin; 123-signal pin;

13-a resistive element; 14-a reinforcing plate; 15-a support plate;

2-a battery; 3-main board.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Referring to fig. 1, a battery protection board in the prior art is shown, which includes a circuit board 11, a connector 12 disposed at one end of the circuit board 11, and a component E at the other end, where the component E is connected to the connector 12 through a long trace L disposed on the circuit board 11 to form a charging and discharging loop of a battery. The component E may be, for example, a resistor. Because the wiring L of the element E occupies more space of the circuit board 11, when the cell width of the battery is limited, the layout and wiring of other electronic elements on the circuit board 11 can be influenced, so that the overcurrent area of the wiring metal layer on the high-current loop is smaller, the impedance is larger, the temperature rise is higher, and the size of the charging current is influenced. Especially, when at least a portion of the circuit board 11 is a flexible circuit board, the trace L of the component E may also affect the bending space of the flexible circuit board.

In addition, when the positive and negative poles of the connector at the end of the electronic device adjuster are reversed, the connectors 12 on the battery protection board also need to be reversed synchronously, which prevents the traces L from being arranged centrally on the circuit board 11. In the process of battery assembly, production and transportation, the wiring L arranged near the edge of the circuit board 11 is easy to be damaged, which causes the fault of short circuit and the like of the whole machine, thereby being incapable of charging the battery.

In order to solve the above problem, an embodiment of the present invention provides a novel battery protection plate 1. For better understanding of the present invention, a battery protection plate according to an embodiment of the present invention is described in detail below with reference to fig. 2 to 5.

Referring to fig. 2 to 4, a battery protection plate 1 according to an embodiment of the present invention includes a circuit board 11 and a resistor 13.

The circuit board 11 includes a component arrangement region 11a and a connection region 11b, the connection region 11b is formed by extending the end of the circuit board away from the component arrangement region 11a, the component arrangement region 11a is provided with an electronic component, and the electronic component may be, for example, a sampling resistor Rs, a control chip IC, a MOS switch, etc. The connection region 11b is provided with a connector 12 for connecting an external circuit.

The circuit board 11 generally includes a conductive layer and an insulating layer, the conductive layer includes a substrate and a metal layer disposed on two sides of the substrate, and the insulating layer is attached to the metal layer for protecting the metal layer and preventing the metal layer from being oxidized. At least one side surface of the circuit board 11 is a component arrangement region 11 a. In this embodiment, the substrate is a non-conductive material, such as a polyimide film material, and the metal layer is a copper foil.

The resistance element 13 is provided in the connection region 11 b. Because the resistor element 13 and the connector 12 are both disposed in the connection region 11b, compared with the prior art, the routing L between the resistor element 13 and the connector 12 can be greatly shortened or even eliminated, so that a space for arranging other components can be reserved for the component arrangement region 11a, and the overall size of the circuit board 11 is reduced. Meanwhile, the overcurrent area of the wiring metal layer on the high-current loop can be increased, so that the impedance can be reduced, and the charging current can be increased.

The embodiment of the utility model provides a pair of battery protection board 1, arrange regional 11a through the components and parts with resistive element 13 by circuit board 11 and move to connection region 11b, can shorten resistive element 13 walk line L, save components and parts and arrange regional 11 a's occupation space to increased the overcurrent area who walks the line metal level on the heavy current return circuit, be favorable to improving the temperature rise, satisfied the functional requirement of heavy current charge-discharge.

As shown in fig. 2 and 3, the connection area 11b of the circuit board 11 includes a positive input terminal 111 and a negative input terminal 112. The connector 12 includes a connector body 120, and a power positive pin 121, a power negative pin 122, and a signal pin 123 connected to the connector body 120. The positive power pin 121 is connected to the positive input 111, and the negative power pin 122 is connected to the negative input 112.

As an alternative embodiment, the resistance element 13 is an Identification resistance (ID) for identifying the battery as described above. The ID resistor is usually a conventional resistor with a fixed resistance value, and the electronic device can know the type or capacity of the battery by reading the resistance value of the ID resistor. For example, the battery can be judged to be a nickel-hydrogen battery or a lithium ion battery according to the difference of the resistance values, whether the brand of the battery is a designated brand or not and the manufacturer information of the battery, so as to prevent counterfeit batteries. In addition, the battery can be judged to be a large-capacity battery or a common-capacity battery according to the difference of the resistance values.

In some embodiments, an ID resistor is disposed adjacent to the connector 12 in the connection region 11b, one end of the ID resistor is connected to the negative input terminal 112, and the other end is connected to the signal pin 123 of the connector 12 through a trace L disposed in the connection region 11 b. In addition, the positive power pin 121 of the connector 12 is connected to the positive input end 111 of the circuit board 11, and the negative power pin 122 of the connector 12 is connected to the negative input end 112 of the circuit board 11, so that the ID resistor forms a signal branch independent of the battery charging and discharging circuit.

Since the ID resistor is provided in the connection region 11b and adjacent to the connector 12, the trace L can be designed to be short, while also saving space in the component arrangement region 11a, as shown in fig. 3.

Fig. 4 shows a schematic circuit structure diagram of a battery protection board according to an embodiment of the present invention. As shown in fig. 4, in the charge and discharge circuit of the battery, the control chip IC controls the MOS switch to be turned on under all normal conditions, so as to turn on the battery and the external circuit, and when the voltage of the battery or the circuit current exceeds a predetermined value, the control chip IC immediately controls the MOS switch to be turned off, thereby protecting the safety of the battery. In the normal condition of the battery protection board 1, Vdd is high, Vss, VM is low, and DO, CO is high, and when any one of Vdd, CS, VM changes, the level of the DO or CO terminal will change. The ID resistor is independent of a charge-discharge loop of the battery to form a signal branch circuit for confirming the type, the capacity and other related information of the battery before charging, and the influence of the misdischarge of the battery on the performance of the electronic equipment is prevented.

In some embodiments, the ID resistor is embedded in the connector body 120 of the connector 12, and has one end connected to the negative power pin 122 and the other end connected to the signal pin 123. In addition, the positive power pin 121 of the connector 12 is connected to the positive input end 111 of the circuit board 11, and the negative power pin 122 of the connector 12 is connected to the negative input end 112 of the circuit board 11, so that the ID resistor forms a signal branch independent of the battery charging and discharging circuit.

Because the ID resistor is embedded in the connector body 120 of the connector 12, the wiring L does not need to be specially arranged in the connection region 11b of the circuit board 11, so that the occupied space of the component arrangement region 11a is further saved, which is beneficial to reducing impedance and improving the magnitude of charging current.

In addition, the ID resistor and the connector 12 are integrated into a whole, so that the surface mounting process of the ID resistor is reduced, and material management is facilitated. Meanwhile, the connector body 120 also provides stress-resistant protection for the ID resistor, and the reliability of the ID resistor is ensured.

As an alternative embodiment, the resistance element 13 may also be a temperature sensing resistor for the protection circuit: negative Temperature Coefficient thermistors (NTCs). An NTC thermistor is a sensor resistance whose resistance value decreases with increasing temperature. The NTC thermistor has a large initial resistance value, so that the current blocking effect is large, and the peak current can be effectively blocked. When the circuit tends to be stable, the resistance value of the NTC thermistor gradually becomes smaller, thereby protecting the circuit.

In some embodiments, the NTC thermistor is disposed adjacent to the connector 12 at the connection region 11b, and one end of the NTC thermistor is connected to the negative input terminal 112 and the other end is connected to the signal pin 123 of the connector 12 through the trace L disposed at the connection region 11 b. In addition, the positive power pin 121 of the connector 12 is connected to the positive input end 111 of the circuit board 11, and the negative power pin 122 of the connector 12 is connected to the negative input end 112 of the circuit board 11, so that the NTC thermistor forms a signal branch independently of the charge and discharge circuit of the battery.

Since the NTC thermistor is disposed in the connection region 11b and adjacent to the connector 12, the trace L can be designed to be short while also saving space in the component arrangement region 11a, as shown in fig. 3.

In some embodiments, the NTC thermistor is embedded in the connector body 120 of the connector 12, and has one end connected to the power supply negative pin 122 and the other end connected to the signal pin 123. In addition, the positive power pin 121 of the connector 12 is connected to the positive input end 111 of the circuit board 11, and the negative power pin 122 of the connector 12 is connected to the negative input end 112 of the circuit board 11, so that the NTC thermistor forms a signal branch independently of the charge and discharge circuit of the battery.

Since the NTC thermistor is embedded in the connector body 120 of the connector 12, the wiring L does not need to be specially arranged in the connection region 11b of the circuit board 11, so that the occupied space of the component arrangement region 11a is further saved, the impedance is reduced, and the charging current is increased.

As an alternative embodiment, the resistance element 13 may also be another temperature detection resistor for the protection circuit: a Positive Temperature Coefficient thermistor (PTC). A PTC thermistor is a semiconductor resistor typically having temperature sensitivity, and its resistance value increases stepwise with an increase in temperature when a certain temperature is exceeded. In a stable circuit, the PTC thermistor is equivalent to a lead, when a temporary pulse signal is met, the resistance value of the PTC thermistor is increased rapidly, and the circuit is equivalent to an open circuit; when the pulse signal leaves, the current is reduced, the resistance value of the PTC thermistor is reduced, and the circuit is recovered to be normal.

In some embodiments, the PTC thermistor is embedded in the connector body 120 of the connector 12. One end of the PTC thermistor is connected to the positive input terminal 111 of the circuit board 11, and the other end is connected to the positive power pin 121 of the connector 12, so that the PTC thermistor is connected in series to the charge and discharge circuit of the battery. Since the PTC thermistor is embedded in the connector body 120 of the connector 12, the wiring L does not need to be specially arranged on the circuit board 11, so that the occupied space of the component arrangement region 11a is further saved, which is beneficial to reducing the impedance and improving the charging current.

In some embodiments, the PTC thermistor is connected to the negative input terminal 112 of the circuit board 11 at one end and to the negative power pin 122 of the connector 12 at the other end, thereby connecting the PTC thermistor in series in the charge and discharge circuit of the battery. Similarly, since the PTC thermistor is embedded in the connector body 120 of the connector 12, the wiring L does not need to be specially arranged on the circuit board 11, so that the occupied space of the component arrangement region 11a is further saved, which is beneficial to reducing the impedance and increasing the magnitude of the charging current.

In addition, the PTC thermistor or NTC and the connector 12 are integrated into a whole, so that the surface mounting process of the PTC thermistor or NTC is reduced, and material management is facilitated. Meanwhile, the connector body 120 also provides stress-resistant protection for the PTC thermistor or the NTC thermistor, thereby ensuring reliability of the PTC thermistor or the NTC thermistor.

It is to be understood that the resistance element 13 may be any two of an ID resistor and an NTC thermistor, and a PTC thermistor, for example, the ID resistor and the NTC thermistor may be simultaneously provided at the connection region 11b and adjacent to the connector 12, in which case the PTC thermistor is provided at the component arrangement region 11a, as shown in fig. 4.

It is understood that the resistor element 13 may be three of an ID resistor, an NTC thermistor and a PTC thermistor, that is, the ID resistor, the NTC thermistor and the PTC thermistor are simultaneously disposed at the connection region 11 b. For example, the ID resistor and the NTC thermistor are both disposed at the connection region 11b of the circuit board 11, and the PTC thermistor is embedded in the connector body 120, which will not be described in detail.

The Circuit Board 11 may be a rigid Circuit Board (PCB), a Flexible Circuit Board (FPC), or a rigid-flex Circuit Board (FPC), as described above. Among them, the flexible circuit board is the most commonly used material due to its moderate price and good flexibility. In this embodiment, the circuit board 11 is a flexible circuit board.

Referring to fig. 5, the battery protection board 1 further includes a reinforcing plate 14 disposed on the circuit board 11, and the reinforcing plate 14 is disposed corresponding to the connection region 11b for supporting the connection region 11 b. The reinforcing plate 14 may be a metal plate or a fiber plate.

When the reinforcing plate 14 is a metal plate, such as a steel plate, the battery protection plate 1 further includes an insulating member interposed between the connection region 11b and the reinforcing plate 14. The insulating member may be foam, double-sided tape, insulating film, or the like. Alternatively, an insulating member may be bonded between the connection region 11b of the circuit board 11 and the reinforcing plate 14, so that the circuit board 11 is fixed to the reinforcing plate 14.

Further, the battery protection board 1 further includes a support plate 15 provided on the circuit board 11, the support plate 15 being provided corresponding to the component arrangement region 11a for supporting the component arrangement region 11 a. The support plate 15 may be a metal plate or a fiber plate.

When the support plate 15 is a metal plate, such as a steel plate, the battery protection board 1 further includes an insulating member interposed between the component arrangement region 11a and the support plate 15. The insulating member may be foam, double-sided tape, insulating film, or the like. Alternatively, an insulating member may be bonded between the component arrangement region 11a of the circuit board 11 and the support plate 15, so that the circuit board 11 is fixed on the support plate 15.

In addition, the portion of the circuit board 11 between the component arrangement region 11a and the connection region 11b is an unsupported flexible circuit board, so that bending operation can be performed, the occupied space of the circuit board 11 is reduced, and the connector 12 is conveniently connected with an external circuit.

Further, the circuit board 11 further includes a cell connection portion 113, and the cell connection portion 113 extends outward from a side edge of the component arrangement region 11a, and is used for being electrically connected with the battery. Specifically, the battery includes a battery cell and a tab, the tab extends from one side of the battery cell, and the tab is electrically connected to the cell connecting portion 113 of the battery protection board 1.

Referring to fig. 6, an embodiment of the present invention further provides an electronic device, including: the battery protection plate 1, the battery 2 and the main plate 3 as described above.

The battery 2 comprises an electric core and a lug, the lug extends out from one side of the electric core, and the lug is electrically connected with the battery protection plate 1. The main board 3 is provided with a docking connector, which is connected with the connector 12 of the battery protection board 1.

The electronic device may be a smartphone, a tablet computer, a laptop computer, a game console, a wearable device, an electronic book, a vehicle-mounted device, a POS machine, or the like.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery protection plate, comprising:

the circuit board comprises a component arrangement area and a connection area, wherein the connection area is formed by extending one end, far away from the component arrangement area, of the circuit board outwards;

and the resistance element is arranged in the connection area.

2. The battery protection plate according to claim 1, wherein the resistance element is an identification resistor and/or a temperature detection resistor, and the temperature detection resistor includes a negative temperature coefficient thermistor and a positive temperature coefficient thermistor.

3. The battery protection plate as claimed in claim 1, wherein the connection region of the circuit board includes a positive input terminal and a negative input terminal;

the connector comprises a connector body, and a power supply positive electrode pin, a power supply negative electrode pin and a signal pin which are connected with the connector body;

the power supply positive electrode pin is connected with the positive electrode input end, and the power supply negative electrode pin is connected with the negative electrode input end.

4. The battery protection plate according to claim 3, wherein the resistance element is an identification resistor and/or a negative temperature coefficient thermistor;

the resistor element is arranged adjacent to the connector in the connecting area, one end of the resistor element is connected with the negative input end, and the other end of the resistor element is connected with the signal pin of the connector through a wire arranged in the connecting area.

5. The battery protection plate according to claim 3, wherein the resistance element is an identification resistor and/or a negative temperature coefficient thermistor;

the resistor element is embedded into the connector body of the connector, one end of the resistor element is connected with the power supply negative electrode pin, and the other end of the resistor element is connected with the signal pin.

6. The battery protection plate as claimed in claim 3, wherein the resistance element is a positive temperature coefficient thermistor;

the resistor element is embedded into the connector body of the connector, one end of the resistor element is connected with the positive input end of the circuit board, and the other end of the resistor element is connected with the positive pin of the power supply of the connector; or one end of the resistance element is connected with the negative input end of the circuit board, and the other end of the resistance element is connected with the power supply negative pin of the connector.

7. The battery protection plate according to claim 1, wherein the circuit board is a flexible circuit board, and the battery protection plate further comprises a reinforcing plate provided on the circuit board, the reinforcing plate being provided corresponding to the connection region for supporting the connection region.

8. The battery protection plate according to claim 7, further comprising a support plate provided on the circuit board, the support plate being provided corresponding to the component arrangement region for supporting the component arrangement region.

9. The battery protection board according to claim 1, wherein the circuit board further includes a cell connecting portion extending outward from one side of the component arrangement region for electrical connection with a battery.

10. An electronic device, comprising:

the battery protection sheet as claimed in any one of claims 1 to 9;

the battery comprises a battery core and a lug, wherein the lug extends out of one side of the battery core and is electrically connected with the battery protection plate;

and the main board is provided with a butting connector, and the butting connector is connected with the connector of the battery protection board.