CN108767917B - Battery protection system - Google Patents
Battery protection system Download PDFInfo
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- CN108767917B CN108767917B CN201810505685.3A CN201810505685A CN108767917B CN 108767917 B CN108767917 B CN 108767917B CN 201810505685 A CN201810505685 A CN 201810505685A CN 108767917 B CN108767917 B CN 108767917B
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- gasket
- limiting resistor
- battery
- current
- battery protection
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- 238000004806 packaging method and process Methods 0.000 claims abstract description 18
- 230000003068 static effect Effects 0.000 claims abstract description 11
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000000670 limiting effect Effects 0.000 claims description 58
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 235000012431 wafers Nutrition 0.000 description 34
- 238000010586 diagram Methods 0.000 description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 230000005611 electricity Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The embodiment of the invention provides a battery protection system, which saves the space of a circuit board. The battery protection system provided by the embodiment of the invention comprises: a battery cell; the battery protection chip comprises a battery protection wafer, a packaging body used for packaging the battery protection wafer and a lead wire used for electrically connecting a gasket on the battery protection wafer to the outside of the packaging body, wherein the battery protection wafer comprises a first gasket, a second gasket, and an electrostatic protection device and a current-limiting resistor which are connected in series between the first gasket and the second gasket, and the electrostatic protection device is broken down when static exists, so that an electrostatic discharge path is formed among the first gasket, the electrostatic protection device, the current-limiting resistor and the second gasket; the lead connected with the first gasket is connected with the positive electrode of the battery cell; and the lead connected with the second gasket is connected with the negative electrode of the battery cell.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a battery protection system.
Background
In the lithium battery in the prior art, because the structure of the lithium battery contains combustible substances, the lithium battery needs to pay extra attention to data related to temperature, voltage, current and the like, and in order to obtain accurate data, a protection chip is mostly arranged to monitor the data or timely adjust the data when the data has problems.
Fig. 1 is a circuit diagram of a battery protection system in the prior art, and as shown in fig. 1, in order to prevent a protection chip from being damaged due to a life problem or an accident, and thus a large current is formed inside the protection chip, which causes a cell to spontaneously ignite and further causes an accident such as explosion, a current limiting resistor R1 is provided in the circuit, and the resistance of R1 is of a hundred ohm magnitude.
However, in the prior art, this way of using the current limiting resistor R1 needs to occupy the area of the circuit board.
Disclosure of Invention
The embodiment of the application provides a battery protection system, which can save the space of a circuit board.
According to a first aspect of the present invention, an embodiment of the present invention provides a battery protection system, including: a battery cell; the battery protection chip comprises a battery protection wafer, a packaging body used for packaging the battery protection wafer and a lead wire used for electrically connecting a gasket on the battery protection wafer to the outside of the packaging body, wherein the battery protection wafer comprises a first gasket, a second gasket, and an electrostatic protection device and a current-limiting resistor which are connected in series between the first gasket and the second gasket, and the electrostatic protection device is broken down when static exists, so that an electrostatic discharge path is formed among the first gasket, the electrostatic protection device, the current-limiting resistor and the second gasket; the lead connected with the first gasket is connected with the positive electrode of the battery cell; and the lead connected with the second gasket is connected with the negative electrode of the battery cell.
The above aspects and any possible implementations further provide an implementation in which the first pad, the second pad, and the current limiting resistor are formed from a metal layer in a wafer.
As with the above-described aspect and any possible implementation, there is further provided an implementation in which the current-limiting resistor is a metal trace.
The aspect and any possible implementation manner described above further provide an implementation manner that the length of the metal trace is greater than or equal to 1000 μm, and/or the width of the metal trace is greater than or equal to 3 μm and less than or equal to 8 μm.
The above aspects, and any possible implementations, further provide an implementation,
the resistance value of the current limiting resistor is 80-200 ohms.
There is further provided, in accordance with the above-described aspect and any possible implementation, an implementation characterized in that,
the first end of the current-limiting resistor is connected with the first gasket, and the second end of the current-limiting resistor is connected with the electrostatic protection device; or,
the first end of the current limiting resistor is connected with the electrostatic protection device; the second end of the current limiting resistor is connected with the second gasket, or,
the current limiting resistor comprises a first current limiting resistor and a second current limiting resistor;
the first end of the first current limiting resistor is connected with the first gasket, and the second end of the first current limiting resistor is connected with the electrostatic protection device; and the first end of the second current limiting resistor is connected with the second gasket, and the second end of the second current limiting resistor is connected with the electrostatic protection device.
The above-described aspects and any possible implementation further provide an implementation, further including:
an internal circuit comprising a first terminal and a second terminal;
the first end of the internal circuit is connected with the first gasket, and the second end of the internal circuit is connected with the second gasket.
The above aspects, and any possible implementations, further provide an implementation,
the electrostatic protection device comprises a first end, a second end and a third end;
the first end of the current-limiting resistor is connected with the first gasket, and the second end of the current-limiting resistor is connected with the first end of the electrostatic protection device; the second end of the electrostatic protection device is connected with the second gasket; the third end of the electrostatic protection device is connected with the second gasket; or,
the first end of the electrostatic protection device is connected with the first gasket, and the first end of the current-limiting resistor is connected with the third end of the electrostatic protection device; the second end of the current limiting resistor is connected with the second gasket; the second end of the electrostatic protection device is connected with the second gasket.
The above aspects, and any possible implementations, further provide an implementation,
the first gasket is used for being connected with the positive electrode of the battery cell;
the second gasket is used for being connected with the negative electrode of the battery electric core.
By adopting the battery system provided by the embodiment of the application, the electrostatic protection device and the current-limiting resistor are connected in series between the first gasket and the second gasket, and the current-limiting resistor is arranged inside the chip, so that the space of the circuit board is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a circuit diagram of a prior art battery protection system;
fig. 2 is a schematic view of a first structure of a battery protection wafer according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a second structure of a battery protection wafer according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a third structure of a battery protection wafer according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a fourth structure of a battery protection wafer according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a fifth structure of a battery protection wafer according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a sixth structure of a battery protection wafer according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the prior art, a lithium battery is mostly provided with a chip playing a role in protection, and the chip and the lithium battery are connected in a manner that pins of the chip are directly connected with the positive electrode and the negative electrode of the lithium battery. The chip belongs to an electronic device, so that the service life and the defective rate are certain, and meanwhile, the chip is damaged due to the occurrence of certain probability of emergency in the discharging and charging processes of the lithium battery, so that a large-current leakage circuit is formed between the anode and the cathode of the lithium battery, and accidents such as spontaneous combustion, explosion and the like of the lithium battery are easily caused.
In order to solve the problem, in the prior art, a current limiting resistor R1 is added outside the chip in the manner shown in fig. 1, and the current limiting function of the current limiting resistor R1 is utilized to prevent the chip from being damaged by accidents and the like, so that the lithium battery is prevented from being burnt.
However, this method not only increases the cost, but also enlarges the occupied area. In the prior art, an electrostatic protection design is required between two PADs (PAD) of a battery protection wafer to protect internal circuits (such as a specific battery protection circuit) from static electricity. In the electrostatic protection design, one electrostatic protection device is usually provided between two pads, and the other connecting wires are provided with a short and thick length to reduce the resistance of the wires as much as possible, so that static electricity can be discharged through the wires and the electrostatic discharge device when the static electricity is discharged. However, in the embodiment of the present invention, the conventional design of using a thick and short conducting wire for electrostatic discharge is skipped, and a current limiting resistor is designed inside the chip and located in the electrostatic discharge path, so as to provide a battery protection wafer, as shown in fig. 2, fig. 2 is a schematic diagram of a first structure of an embodiment of the battery protection wafer provided in the embodiment of the present invention, and the battery protection wafer provided in the embodiment of the present invention includes: the device comprises a first pad 1, a second pad 2, an electrostatic protection device 3 and a current limiting resistor 4, wherein the electrostatic protection device 3 and the current limiting resistor 4 are connected in series between the first pad 1 and the second pad 2.
Preferably, in order to realize the current limiting function, the resistance value of the current limiting resistor 4 is designed according to the requirements of the actual circuit, and generally can be 50-200 ohms, and preferably 80-120 ohms. .
In a preferred embodiment, the current limiting resistor 4 is a metal trace. In order to achieve the resistance value of the current-limiting resistor 4 by means of the internal resistance value of the metal trace, the length and/or width of the metal trace can be adjusted according to the actual circuit requirement. More preferably, the length of the metal trace of the current limiting resistor 4 may be greater than or equal to 1000 μm, and/or the width of the metal trace may be greater than or equal to 3 μm and less than or equal to 8 μm. The metal trace may be made of a common metal material, such as aluminum, copper, etc., or may be made of a non-common metal material according to actual circuit requirements or technical development, which is not limited in the present invention.
Further, it is preferable that the metal traces 2 have a serpentine shape, and the serpentine shape is convenient for effective use of space, and when the electrostatic protection device 3 is subjected to electrostatic discharge, the voltage difference between adjacent traces is small. The phenomenon that the oxide isolation layer between the adjacent wires is broken down is not easy to occur.
In the embodiment of the invention, the electrostatic protection device 3 is broken down when static exists, so that an electrostatic discharge path is formed among the first gasket 1, the electrostatic protection device 3, the current limiting resistor 4 and the second gasket 2; the electrostatic protection device 3 maintains an off state when there is no static electricity.
In an embodiment of the present invention, when manufacturing the battery protection wafer, the first pad 1, the second pad 2 and the current limiting resistor 4 may all be formed in a metal layer, and since the metal layer inside the wafer has multiple layers, the first pad 1, the second pad 2 and the current limiting resistor 4 may be in the same layer or different layers. The pattern of the mask can be adjusted according to actual requirements.
The battery protection wafer provided by the embodiment of the invention arranges the current-limiting resistor 4 in the chip, and does not occupy the space outside the chip, thereby saving the space of a circuit board. In addition, the battery protection wafer provided in the embodiment of the present invention has been subjected to static electricity tests repeatedly, and tests prove that the design is correct, which can achieve good static electricity protection for internal circuits inside the chip, and eliminate the doubt and worry of the ordinary skilled person in the art.
In this embodiment of the present invention, inside a battery protection wafer, a current limiting resistor 4 may be disposed at a plurality of positions, specifically, fig. 3 is a second schematic structural diagram of an embodiment of the battery protection wafer provided in this embodiment of the present invention, fig. 4 is a third schematic structural diagram of the embodiment of the battery protection wafer provided in this embodiment of the present invention, as shown in fig. 2, it is a first connection manner of the current limiting resistor 4, a first end of the current limiting resistor 4 is connected to a first pad 1, and a second end of the current limiting resistor 4 is connected to an electrostatic protection device 3; as shown in fig. 3, which is a second connection mode of the current limiting resistor 4, a first end of the current limiting resistor 4 is connected to the electrostatic protection device 3; the second end of the current limiting resistor 4 is connected with the second gasket 2; as shown in fig. 4, which is a third connection manner of the current limiting resistor 4, the current limiting resistor 4 includes a first current limiting resistor 41 and a second current limiting resistor 42; a first end of the first current limiting resistor 41 is connected with the first gasket 1, and a second end of the first current limiting resistor 41 is connected with the electrostatic protection device 3; and a first end of the second current limiting resistor 42 is connected with the second pad 2, and a second end of the second current limiting resistor 42 is connected with the electrostatic protection device 3. It can be seen that the current limiting resistor 4 may be connected in various forms with the electrostatic protection device in series between the first pad and the second pad, as long as the current limiting resistor can achieve the corresponding current limiting effect.
As shown in fig. 5, fig. 5 is a schematic diagram of a fourth structure of an embodiment of a battery protection wafer according to the present invention, and since the electrostatic protection device 3 and the current limiting resistor 4 are used to protect an internal circuit in the embodiment of the present invention, the battery protection wafer may further include, on the basis of the foregoing contents: an internal circuit 5.
A first terminal of the internal circuit 5 is connected to the first pad 1, and a second terminal of the internal circuit 5 is connected to the second pad 2. The internal circuit 5 is a specific battery protection circuit in the wafer, such as a charging overcurrent protection circuit, a charging overvoltage protection circuit, a discharging overcurrent protection circuit, a discharging overvoltage protection circuit and/or a short-circuit protection circuit.
As shown in fig. 6, fig. 6 is a schematic diagram of a fifth structure of an embodiment of a battery protection wafer according to the present invention, and in a specific implementation process, an electrostatic protection device 3 includes a first terminal, a second terminal, and a third terminal; the first end of the current-limiting resistor 4 is connected with the first gasket 1, and the second end of the current-limiting resistor 4 is connected with the first end of the electrostatic protection device 3; the second end of the electrostatic protection device 3 is connected with the second gasket 2; the third terminal of the electrostatic protection device 3 is connected to the second pad 2. In the embodiment of the present invention, the electrostatic protection device 3 may be a triode, or may be in the form of a combination of other electronic components.
As shown in fig. 7, fig. 7 is a schematic diagram of a sixth structure of an embodiment of a battery protection wafer according to the present invention, and in another specific implementation process, an electrostatic protection device 3 includes a first terminal, a second terminal, and a third terminal; the first end of the electrostatic protection device 3 is connected with the first gasket 1; the first end of the current limiting resistor 4 is connected with the third end of the electrostatic protection device 3; the second end of the current limiting resistor 4 is connected with the second gasket 2; a second end of the electrostatic protection device 3 is connected to the second pad 2. In the embodiment of the present invention, the electrostatic protection device 3 may be a triode, or may be in the form of a combination of other electronic components.
In addition, in the embodiment of the present invention, when the battery protection wafer is packaged into a chip and connected, the first gasket 1 is used for being connected to the positive electrode of the battery electric core; the second gasket 2 is used for being connected with a negative electrode of the battery electric core.
The embodiment of the invention also provides a battery protection chip, wherein the chip comprises any one of the battery protection wafers in the content and a packaging body for packaging the wafer; the two leads are respectively a first lead and a second lead.
One end of the first lead is connected with the first gasket, and the other end of the first lead is exposed out of the packaging body; one end of the second lead is connected with the second gasket, and the other end of the second lead is exposed out of the packaging body.
The embodiment of the invention also provides a battery system, a battery cell, and any one of the battery protection chips as described in the foregoing;
one end of the first lead, which is exposed out of the packaging body, is connected with the positive electrode of the battery cell;
one end of the second lead, which is exposed out of the packaging body, is connected with the negative electrode of the battery cell.
The battery protection system provided by the embodiment of the invention comprises: a battery cell; the battery protection chip comprises a battery protection wafer, a packaging body used for packaging the battery protection wafer and a lead wire used for electrically connecting a gasket on the battery protection wafer to the outside of the packaging body, wherein the battery protection wafer comprises a first gasket, a second gasket, and an electrostatic protection device and a current-limiting resistor which are connected in series between the first gasket and the second gasket, and the electrostatic protection device is broken down when static exists, so that an electrostatic discharge path is formed among the first gasket, the electrostatic protection device, the current-limiting resistor and the second gasket; the lead connected with the first gasket is connected with the positive electrode of the battery cell; and the lead connected with the second gasket is connected with the negative electrode of the battery cell. For further details, reference is made to the preceding description.
The terms "connected" and "connected" as used herein mean electrically connected, directly or indirectly, unless otherwise specified.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (3)
1. A battery protection system, comprising:
a battery cell;
the battery protection chip comprises a battery protection wafer, a packaging body used for packaging the battery protection wafer and a lead wire used for electrically connecting a gasket on the battery protection wafer to the outside of the packaging body, wherein the battery protection wafer comprises a first gasket, a second gasket, and an electrostatic protection device and a current-limiting resistor which are connected in series between the first gasket and the second gasket, and the electrostatic protection device is broken down when static exists, so that an electrostatic discharge path is formed among the first gasket, the electrostatic protection device, the current-limiting resistor and the second gasket;
the lead connected with the first gasket is connected with the positive electrode of the battery cell, and the lead connected with the second gasket is connected with the negative electrode of the battery cell;
the first pad, the second pad and the current limiting resistor are all formed by a metal layer in the battery protection wafer, the current limiting resistor is a metal wiring, the resistance value of the current limiting resistor is 50-200 ohm,
the first end of the current-limiting resistor is connected with the first gasket, and the second end of the current-limiting resistor is connected with the electrostatic protection device; or,
the first end of the current-limiting resistor is connected with the electrostatic protection device, and the second end of the current-limiting resistor is connected with the second gasket; or,
the current limiting resistor comprises a first current limiting resistor and a second current limiting resistor, the first end of the first current limiting resistor is connected with the first gasket, the second end of the first current limiting resistor is connected with the electrostatic protection device, the first end of the second current limiting resistor is connected with the second gasket, and the second end of the second current limiting resistor is connected with the electrostatic protection device.
2. The battery protection system according to claim 1, wherein the length of the metal trace is greater than or equal to 1000 μm, or/and the width of the metal trace is greater than or equal to 3 μm and less than or equal to 8 μm.
3. The battery protection system of claim 1, further comprising:
an internal circuit comprising a first terminal and a second terminal;
the first end of the internal circuit is connected with the first gasket, and the second end of the internal circuit is connected with the second gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505685.3A CN108767917B (en) | 2018-05-24 | 2018-05-24 | Battery protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505685.3A CN108767917B (en) | 2018-05-24 | 2018-05-24 | Battery protection system |
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| CN108767917A CN108767917A (en) | 2018-11-06 |
| CN108767917B true CN108767917B (en) | 2021-01-01 |
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| CN201810505685.3A Active CN108767917B (en) | 2018-05-24 | 2018-05-24 | Battery protection system |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005339966A (en) * | 2004-05-26 | 2005-12-08 | Mitsumi Electric Co Ltd | Terminal pad structure |
| CN101272050B (en) * | 2007-03-21 | 2010-04-21 | 中国科学院电子学研究所 | Integrated circuit with electrostatic protection structure |
| CN101562140B (en) * | 2008-04-16 | 2010-12-01 | 中国科学院微电子研究所 | Packaging method for improving antistatic capability of integrated circuit chip |
| CN101339941B (en) * | 2008-05-08 | 2010-06-02 | 北京中星微电子有限公司 | Electrostatic discharging protection circuit |
| CN104753036B (en) * | 2015-04-03 | 2017-12-26 | 无锡中感微电子股份有限公司 | Integrated type battery protection chip, battery protecting circuit complex and battery |
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