Battery protection plate and battery with same

Abstract

The utility model provides a battery protection board and a battery with the same, and the battery protection board comprises a PCB which is provided with a main circuit and a sampling circuit; the sampling resistor comprises an alloy part, an electrode and a sampling binding wire, the alloy part is arranged on the upper surface of the PCB, the electrode is arranged on the alloy part and electrically connected with the main circuit, one end of the sampling binding wire is connected with the alloy part, and the other end of the sampling binding wire is connected with the sampling circuit; the sealing glue layer is arranged on the upper surface of the PCB, and the sealing glue layer wraps the outer side of the alloy part, the outer side of the electrode and the outer side of the sampling binding wire. Through the technical scheme provided by the invention, the problem that errors are generated due to the fact that the charging parameters collected by the sampling line in the related technology are influenced by soldering paste can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chip packaging technical field, specifically, relate to a battery protection board and have its battery. BACKGROUND

[0002] In order to meet the user demand, most mobile phone products currently hope that battery can be quickly charged (in short time, as many as possible electric quantity is charged), thereby needing to increase battery charging current, the maximum current carrying capacity of the battery protection board of current mobile phone has reached 12A or more, along with the increase of battery charging current, the temperature of PCB board can increase significantly, and the overheat phenomenon of mobile phone charging is very easy to appear, and high temperature has great influence on battery, and there is the risk of explosion. The PCM (Protection Circuit Module) design of current mobile phone battery protection board has become an industry problem to solve the heat dissipation problem, and the heating problem of PCM directly affects the electrical performance and the safety problem of battery.

[0003] In the related art, the battery protection board includes a precision resistor and a PCB board, the PCB board has a main circuit and a sampling circuit, and the sampling resistor is electrically connected with the main circuit and the sampling circuit, respectively. When the sampling resistor is passed through the battery charging and discharging current by the main circuit, the charging and discharging parameters of the sampling resistor are collected by the sampling circuit.

[0004] However, the sampling resistor in the related art is welded on the circuit pad of the PCB board through solder paste, and the sampling circuit is electrically connected with the circuit pad, so that the charging and discharging parameters collected by the sampling circuit are affected by the solder paste and errors are generated. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of battery protection board and have its battery, to solve the problem that the charging and discharging parameters collected by the sampling circuit in the related art are affected by the solder paste and errors are generated.

[0006] According to one aspect of the utility model, a battery protection board is provided, which includes: a PCB board having a main circuit and a sampling circuit; a sampling resistor including an alloy piece, an electrode, and a sampling binding wire, the alloy piece is disposed on the upper surface of the PCB board, the electrode is disposed on the alloy piece and electrically connected with the main circuit, one end of the sampling binding wire is connected with the alloy piece, and the other end of the sampling binding wire is connected with the sampling circuit; an encapsulation layer is disposed on the upper surface of the PCB board, and the encapsulation layer wraps the outside of the alloy piece, the outside of the electrode, and the outside of the sampling binding wire.

[0007] Further, the upper surface of the alloy piece is provided with a lower recess, and one end of the sampling binding wire extends into the lower recess and is electrically connected with the alloy piece.

[0008] Further, the lower recess comprises a positive electrode groove and a negative electrode groove, the positive electrode groove and the negative electrode groove are arranged at the upper surface of the alloy piece at intervals, the sampling binding wire comprises a positive electrode binding wire and a negative electrode binding wire, one end of the positive electrode binding wire extends into the positive electrode groove and is electrically connected with the alloy piece, one end of the negative electrode binding wire extends into the negative electrode groove and is electrically connected with the alloy piece, the other end of the positive electrode binding wire and the other end of the negative electrode binding wire are electrically connected with the sampling circuit respectively.

[0009] Further, the positive electrode groove and the negative electrode groove are located at the edge of the alloy piece and penetrate through the side surface of the alloy piece.

[0010] Further, the electrode comprises a positive electrode and a negative electrode arranged at the lower surface of the alloy piece, the positive electrode and the positive electrode groove are arranged correspondingly, the negative electrode and the negative electrode groove are arranged correspondingly, the lower end of the positive electrode and the lower end of the negative electrode are electrically connected with the main circuit respectively.

[0011] Further, the sampling resistance further comprises a protective layer, the protective layer is arranged at the lower surface of the alloy piece, the protective layer surrounds the outside of the positive electrode and the negative electrode, the protective layer has a positive electrode notch and a negative electrode notch, the lower end of the positive electrode extends into the positive electrode notch, and the lower end of the negative electrode extends into the negative electrode notch.

[0012] Further, one end of the sampling binding wire is electrically connected with the groove bottom of the lower recess.

[0013] Further, the battery protection plate further comprises a MOS element, the MOS element is arranged at the front surface of the PCB plate and is electrically connected with the main circuit, and the encapsulating layer encapsulates the MOS element.

[0014] Further, the battery protection plate further comprises a protection chip, the protection chip is arranged at the front surface of the PCB plate and is electrically connected with the sampling circuit, the protection chip and the MOS element are signal connected, and the encapsulating layer encapsulates the protection chip.

[0015] According to another aspect of the utility model, a kind of battery is provided, and battery includes the battery protection plate provided above.

[0016] The utility model discloses a technical scheme, the battery protection plate provided by the embodiment of the application, battery protection plate includes PCB plate, sampling resistance and encapsulating layer, electrode is arranged on alloy piece and is electrically connected with main circuit, two ends of sampling binding wire are connected with alloy piece and sampling circuit respectively, main circuit passes into alloy piece by electrode with battery charge-discharge current, sampling circuit is directly connected with alloy piece by sampling binding wire with electricity, so that sampling circuit directly collects the charge-discharge parameter of alloy piece, avoid the connection structure of electrode and main circuit to the error influence that the charge-discharge parameter that sampling circuit collects causes, improve the precision of the charge-discharge parameter that sampling circuit collects. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings constituting a part of the specification of the application serve to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0018] Figure 1 A sectional view of a battery protection plate provided by the prior art is shown;

[0019] Figure 2 A sectional view of a battery protection plate provided by the present application is shown.

[0020] Among the above drawings, the following reference signs are included:

[0021] 1, PCB board; 2, main circuit; 3, alloy piece; 4, positive electrode; 5, negative electrode; 6, upper protection layer; 7, lower protection layer; 8, solder layer; 9, sealing glue layer;

[0022] 10, PCB board; 11, main circuit; 12, sampling circuit;

[0023] 20, sampling resistor; 21, alloy piece; 211, lower recess; 2111, positive electrode groove; 2112, negative electrode groove; 22, electrode; 221, positive electrode; 222, negative electrode; 23, sampling binding wire; 231, positive electrode binding wire; 232, negative electrode binding wire; 24, protection layer;

[0024] 30, sealing glue layer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, and by no means constitutes any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative labor fall within the scope of protection of the present application.

[0026] As Figure 1As shown in the prior art, the battery protection plate includes a PCB board 1, a sampling resistor and a sealing glue layer 9, the PCB board 1 has a main circuit 2 and a sampling circuit, the sampling resistor includes an alloy piece 3, a positive electrode 4, a negative electrode 5, an upper protective layer 6 and a lower protective layer 7, the upper protective layer 6 covers the upper surface of the alloy piece 3, the lower protective layer 7 covers the lower surface of the alloy piece 3, the lower protective layer 7 has a positive electrode gap and a negative electrode gap, the positive electrode 4 and the negative electrode 5 are arranged on the alloy piece 3 at intervals, the lower end of the positive electrode 4 extends into the positive electrode gap and is welded and connected with a circuit pad of the main circuit 2 through a solder layer 8, the lower end of the negative electrode 5 extends into the negative electrode gap and is welded and connected with the circuit pad of the main circuit 2 through the solder layer 8, and the sampling circuit is electrically connected with the circuit pad. Wherein, since the sampling circuit is electrically connected with the circuit pad, the solder layer 8 is arranged between the positive electrode 4 and the circuit pad and between the negative electrode 5 and the circuit pad, so that the charging and discharging parameters collected by the sampling circuit are affected by the solder layer 8, the connection structure of the electrode and the main circuit causes error influence on the charging and discharging parameters collected by the sampling circuit 12, and the accuracy of the charging and discharging parameters collected by the sampling circuit 12 is affected.

[0027] As Figure 2 shown, the utility model discloses a kind of battery protection plates, battery protection plate includes PCB board 10, sampling resistor 20 and sealing glue layer 30, PCB board 10 has main circuit 11 and sampling circuit 12, sampling resistor 20 includes alloy piece 21, electrode 22 and sampling binding wire 23, alloy piece 21 is arranged on the upper surface of PCB board 10, electrode 22 is arranged on alloy piece 21 and is electrically connected with main circuit 11, one end of sampling binding wire 23 is connected with alloy piece 21, the other end of sampling binding wire 23 is connected with sampling circuit 12, sealing glue layer 30 is arranged on the upper surface of PCB board 10, and sealing glue layer 30 is wrapped on the outside of alloy piece 21, the outside of electrode 22 and the outside of sampling binding wire 23.

[0028] The battery protection plate provided by the embodiment includes a PCB board 10, a sampling resistor 20 and a sealing glue layer 30, the electrode 22 is arranged on the alloy piece 21 and is electrically connected with the main circuit 11, the two ends of the sampling binding wire 23 are connected with the alloy piece 21 and the sampling circuit 12 respectively, the main circuit 11 passes battery charging and discharging current into the alloy piece 21 through the electrode 22, and the sampling circuit 12 is directly electrically connected with the alloy piece 21 through the sampling binding wire 23, so that the sampling circuit 12 directly collects the charging and discharging parameters of the alloy piece 21, avoids the connection structure of the electrode and the main circuit 11 from causing error influence on the charging and discharging parameters collected by the sampling circuit 12, and improves the accuracy of the charging and discharging parameters collected by the sampling circuit 12.

[0029] Wherein, the sampling resistor 20 is a precision resistor, and the voltage drop generated by the current flowing through the alloy piece 21 is measured through the sampling circuit 12 to calculate the battery charging and discharging current of the main circuit 11 in combination with the voltage drop and the resistance value of the alloy piece 21.

[0030] It should be noted that the outer side of the sealing glue layer 30 wrapping the sampling binding wire 23 means that during the pouring forming process of the sealing glue layer 30, the liquid glue submerges the sampling binding wire 23, so that the liquid glue wraps the sampling binding wire 23, and the liquid glue solidifies to form the sealing glue layer 30, so that the sealing glue layer 30 wraps the outer side of the sampling binding wire 23.

[0031] As shown in Figure 2 , the upper surface of the alloy piece 21 is provided with a lower recess 211, and one end of the sampling binding wire 23 extends into the lower recess 211 and is electrically connected with the alloy piece 21. By providing the lower recess 211, the height of the highest point of the sampling binding wire 23 can be reduced. The sealing glue layer 30 needs to cover all devices arranged on the PCB board, so that the highest point of the sealing glue layer 30 needs to be higher than the highest point of all devices arranged on the PCB board. By reducing the height of the highest point of the sampling binding wire 23, the thickness requirement of the sealing glue layer 30 for the sampling binding wire 23 can be reduced, and the thickness of the battery protection plate can be reduced to meet the customer's requirement for light weight of the battery protection plate product.

[0032] As shown in Figure 2 , the lower recess 211 includes a positive electrode groove 2111 and a negative electrode groove 2112, and the positive electrode groove 2111 and the negative electrode groove 2112 are arranged on the upper surface of the alloy piece 21 at intervals. The sampling binding wire 23 includes a positive electrode binding wire 231 and a negative electrode binding wire 232, one end of the positive electrode binding wire 231 extends into the positive electrode groove 2111 and is electrically connected with the alloy piece 21, one end of the negative electrode binding wire 232 extends into the negative electrode groove 2112 and is electrically connected with the alloy piece 21, and the other end of the positive electrode binding wire 231 and the other end of the negative electrode binding wire 232 are respectively electrically connected with the sampling circuit 12. The potential difference between the positive electrode binding wire 231 and the negative electrode binding wire 232 is detected to obtain the voltage drop generated by the current flowing through the alloy piece 21.

[0033] As shown in Figure 2 , the positive electrode groove 2111 and the negative electrode groove 2112 are located at the edge of the alloy piece 21 and penetrate through the side surface of the alloy piece 21. With the above-mentioned structure of the positive electrode groove 2111 and the negative electrode groove 2112, the positive electrode binding wire 231 can extend out of the positive electrode groove 2111 through the gap of the side surface of the alloy piece 21, and the negative electrode binding wire 232 can extend out of the negative electrode groove 2112 through the gap of the side surface of the alloy piece 21, so as to reduce the height of the highest point of the sampling binding wire 23, and further reduce the thickness of the battery protection plate.

[0034] As shown in Figure 2As shown, the electrode 22 includes a positive electrode 221 and a negative electrode 222 arranged on the lower surface of the alloy piece 21, the positive electrode 221 and the positive electrode slot 2111 are arranged correspondingly, the negative electrode 222 and the negative electrode slot 2112 are arranged correspondingly, and the lower end of the positive electrode 221 and the lower end of the negative electrode 222 are electrically connected to the main line 11 respectively. By arranging the positive electrode 221 and the positive electrode slot 2111 correspondingly and arranging the negative electrode 222 and the negative electrode slot 2112 correspondingly, the potential consistency of the positive electrode binding wire 231 and the positive electrode 221 and the potential consistency of the negative electrode binding wire 232 and the negative electrode 222 can be improved.

[0035] As shown, Figure 2 The sampling resistance 20 further includes a protective layer 24 arranged on the lower surface of the alloy piece 21, the protective layer 24 surrounds the outside of the positive electrode 221 and the negative electrode 222, the protective layer 24 has a positive electrode notch and a negative electrode notch, the lower end of the positive electrode 221 extends into the positive electrode notch, and the lower end of the negative electrode 222 extends into the negative electrode notch. By arranging the protective layer 24 on the lower surface of the alloy piece 21, the lower surface of the alloy piece 21 can be protected.

[0036] As shown, Figure 2 One end of the sampling binding wire 23 is electrically connected to the groove bottom of the lower recess 211. By lowering the height of the connection between the sampling binding wire 23 and the lower recess 211, the height of the highest point of the sampling binding wire 23 can be lowered, so as to further reduce the thickness of the battery protection plate.

[0037] As shown, Figure 2 The battery protection plate further includes a MOS element arranged on the front surface of the PCB plate 10 and electrically connected to the main line 11, and the MOS element is wrapped by the sealing glue layer 30. When the state of the battery changes, by switching the switching state of the MOS element, the communication state of the main line 11 is changed, so as to realize the protection of the battery.

[0038] As shown, Figure 2 The battery protection plate further includes a protection chip arranged on the front surface of the PCB plate 10 and electrically connected to the sampling line 12, the protection chip is signal connected to the MOS element, and the protection chip is wrapped by the sealing glue layer 30. The protection chip measures the voltage drop generated by the current flowing through the alloy piece 21 through the sampling line 12, and calculates the battery charging and discharging current of the main line 11 according to the voltage drop and the resistance value of the alloy piece 21. The protection chip controls the switching state of the MOS element according to the state of the battery and the battery charging and discharging current of the main line 11, so as to realize the protection of the battery.

[0039] In addition, the front surface of the PCB plate 10, the outside of the alloy piece 21, the outside of the MOS element, and the outside of the protection chip are packaged by the same plastic sealing glue, so as to avoid the inconsistency of the expansion coefficients of the plastic sealing glues of different elements and avoid the displacement of the elements due to the stress.

[0040] The utility model discloses another embodiment provides a kind of battery, and battery includes the battery protection plate provided above. Application the battery provided in this embodiment, same can utilize main circuit 11 to pass through electrode 22 into alloy piece 21 with battery charging-discharging current, sampling circuit 12 is directly connected with alloy piece 21 with sampling binding wire 23, to make sampling circuit 12 directly sample the charging-discharging parameter of alloy piece 21, avoid the connection structure of electrode and main circuit 11 to the charging-discharging parameter of sampling circuit 12 collected causes error influence, improve the precision of the charging-discharging parameter of sampling circuit 12 collected.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0042] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not needed in subsequent drawings once an item is defined in one drawing.

[0043] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of contrary statements, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; The orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0044] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Well, the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0045] In addition, it needs to be explained that the use of "first", "second" and the like words to limit the parts, only for the convenience of the corresponding parts for the distinction, such as no other declaration, the above words have no special meaning, therefore can not be understood as the restriction of the scope of protection of the utility model.

[0046] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery protection board, characterized in that, The battery protection board includes: PCB board (10) has main circuit (11) and sampling circuit (12); The sampling resistor (20) includes an alloy part (21), an electrode (22), and a sampling bonding line (23). The alloy part (21) is disposed on the upper surface of the PCB board (10). The electrode (22) is disposed on the alloy part (21) and electrically connected to the main circuit (11). One end of the sampling bonding line (23) is connected to the alloy part (21), and the other end of the sampling bonding line (23) is connected to the sampling circuit (12). An encapsulating layer (30) is disposed on the upper surface of the PCB board (10), and the encapsulating layer (30) wraps around the outside of the alloy part (21), the outside of the electrode (22), and the outside of the sampling binding line (23).

2. The battery protection board according to claim 1, characterized in that, The upper surface of the alloy part (21) is provided with a recess (211), and one end of the sampling binding line (23) extends into the recess (211) and is electrically connected to the alloy part (21).

3. The battery protection board according to claim 2, characterized in that, The recessed portion (211) includes a positive electrode groove (2111) and a negative electrode groove (2112). The positive electrode groove (2111) and the negative electrode groove (2112) are spaced apart on the upper surface of the alloy part (21). The sampling binding line (23) includes a positive electrode binding line (231) and a negative electrode binding line (232). One end of the positive electrode binding line (231) extends into the positive electrode groove (2111) and is electrically connected to the alloy part (21). One end of the negative electrode binding line (232) extends into the negative electrode groove (2112) and is electrically connected to the alloy part (21). The other ends of the positive electrode binding line (231) and the other ends of the negative electrode binding line (232) are respectively electrically connected to the sampling line (12).

4. The battery protection board according to claim 3, characterized in that, The positive electrode groove (2111) and the negative electrode groove (2112) are both located at the edge of the alloy part (21) and penetrate the side surface of the alloy part (21).

5. The battery protection board according to claim 3, characterized in that, The electrode (22) includes a positive electrode (221) and a negative electrode (222) disposed on the lower surface of the alloy part (21). The positive electrode (221) and the positive electrode groove (2111) are disposed correspondingly, and the negative electrode (222) and the negative electrode groove (2112) are disposed correspondingly. The lower end of the positive electrode (221) and the lower end of the negative electrode (222) are respectively electrically connected to the main circuit (11).

6. The battery protection board according to claim 5, characterized in that, The sampling resistor (20) further includes a protective layer (24), which is disposed on the lower surface of the alloy part (21). The protective layer (24) surrounds the outside of the positive electrode (221) and the negative electrode (222). The protective layer (24) has a positive electrode notch and a negative electrode notch. The lower end of the positive electrode (221) extends into the positive electrode notch, and the lower end of the negative electrode (222) extends into the negative electrode notch.

7. The battery protection board according to claim 2, characterized in that, One end of the sampling binding line (23) is electrically connected to the bottom of the recess (211).

8. The battery protection board according to claim 7, characterized in that, The battery protection board also includes a MOS element, which is disposed on the front side of the PCB board (10) and electrically connected to the main circuit (11), and the encapsulating layer (30) wraps the MOS element.

9. The battery protection board according to claim 8, characterized in that, The battery protection board also includes a protection chip, which is disposed on the front side of the PCB board (10) and electrically connected to the sampling line (12). The protection chip is signal connected to the MOS element, and the encapsulation layer (30) wraps the protection chip.

10. A battery, characterized in that, The battery includes the battery protection board according to any one of claims 1 to 9.

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