CN117394508A - Battery protection packaging body - Google Patents
Battery protection packaging body Download PDFInfo
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- CN117394508A CN117394508A CN202311706659.4A CN202311706659A CN117394508A CN 117394508 A CN117394508 A CN 117394508A CN 202311706659 A CN202311706659 A CN 202311706659A CN 117394508 A CN117394508 A CN 117394508A
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- battery protection
- trimming
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- chip
- discharge
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- 238000004806 packaging method and process Methods 0.000 title abstract description 11
- 238000009966 trimming Methods 0.000 claims abstract description 221
- 238000001514 detection method Methods 0.000 claims abstract description 88
- 238000007599 discharging Methods 0.000 claims abstract description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 13
- 229910052744 lithium Inorganic materials 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 22
- 238000013100 final test Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 8
- 235000012431 wafers Nutrition 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 238000012858 packaging process Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- 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
- H02J7/00304—Overcurrent protection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
Abstract
The invention provides a battery protection packaging body, which relates to the technical field of battery protection, and comprises a charge-discharge switch circuit and a packaged battery protection chip, wherein the charge-discharge switch circuit and the packaged battery protection chip are integrated in the same Pack; the battery protection chip realizes overcurrent protection by controlling the turn-off of the charge-discharge switch circuit; the battery protection chip is internally provided with a trimming circuit, and the trimming circuit trims the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip based on the resistance value of the target protection current and the charging and discharging switch circuit. The invention at least realizes the improvement of the suitability of the battery protection chip and the charge-discharge switch, or the improvement of the matching flexibility of the battery protection chip and the charge-discharge switch, can meet different application requirements and improves the applicable range. The trimming circuit can effectively ensure trimming precision of the overcurrent detection voltage and/or the overcurrent reference voltage and stability of parameter precision after trimming through FT trimming.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a battery protection packaging body.
Background
In the battery application environment, the battery protection chip needs to detect the charge and discharge conditions of the battery, and then controls the charge and discharge switch to turn on or off the charge and discharge loop of the battery so as to realize overcurrent protection and prevent the battery from being damaged.
In order to effectively realize the overcurrent protection function, the matching relation between the battery protection chip and the charge-discharge switch needs to be accurately determined, and relevant parameters of the battery protection chip need to be modified on the basis of the matching relation. The problem of trimming matching between the battery protection chip and the charge-discharge switch is needed to be considered when trimming.
In the prior art, a battery protection chip and a charge-discharge switch (generally, a power MOS tube) adopted by a common battery protection system are independent from each other. When the wafer of the integrated circuit with the battery protection chip is obtained, trimming is performed according to the calibrated resistance value of the charge-discharge switch, and the trimming is called CP (Chip Probing) trimming in the field. In order to improve production efficiency and adapt to batch production, wafers in the same batch are generally trimmed according to charge and discharge switches with the same resistance specification (the same resistance specification is the same in calibration resistance value). And finally, packaging the trimmed bare chip in a packaging factory to obtain a finished battery protection chip. After the battery protection chip is provided for downstream manufacturers, the downstream manufacturers weld the charge-discharge switch and the battery protection chip on the PCB to form a complete battery protection system. Therefore, downstream manufacturers must use the charge-discharge switch with the aforementioned resistance specification to weld with the battery protection chip, and if not, the battery protection chip and the charge-discharge switch will be wrongly adapted, resulting in the chip not being usable or the overcurrent protection point being shifted. If the resistance specification of the charge-discharge switch set by the chip manufacturer during trimming in the CP test stage is 10mΩ (milliohm), the downstream manufacturer cannot select the charge-discharge switch with the internal resistance of 9mΩ or 11mΩ when soldering on the PCB, and if not, the chip may not be available or the chip may not be effectively protected from overcurrent, and the actual errors of the charge-discharge switches (power MOS tubes) with the same calibration resistance value of each manufacturer are also different, which further affects the accuracy of the overcurrent protection.
With the development of technology, the requirement on the integration level of a chip is higher, and there is a scheme of integrating a charge-discharge switch and a battery protection circuit in a single chip at the same time, as shown in fig. 1, that is, integrating the charge-discharge switch and a circuit for battery charge-discharge protection (abbreviated as a battery protection circuit) on the same wafer, and then obtaining the battery protection chip through packaging. The chip manufacturer matches the charge-discharge switch and the battery protection circuit during IC design, namely, the resistance value of the charge-discharge switch is determined during IC design, so that the charge-discharge switch and the battery protection circuit with the resistance value can be finally integrated on the same wafer, then the wafer or the cut bare chip is trimmed in the CP test stage, and finally the bare chip is packaged to serve as an independent battery protection chip to leave a factory. Although the matching property of the charge-discharge switch and the battery protection circuit can be ensured, the problem of single suitability exists, namely, as the charge-discharge switch and the battery protection circuit are integrated on the same wafer, the chip can only be matched with a specific charge-discharge switch, and meanwhile, the chip design difficulty and the design cost are obviously increased, and at least ten layers of pictures are required as the layout.
Obviously, in the two schemes, the matching between the charge-discharge switch and the battery protection chip is very limited, so that the chip has poor suitability and limited applicable range.
Disclosure of Invention
The invention provides a battery protection package body, which aims to solve the problems that in the existing overcurrent protection scheme, the matching between a charge-discharge switch and a battery protection chip is very limited, so that the chip has poor suitability and limited applicable range.
In order to solve the problems, the invention discloses a battery protection package body, which comprises a charge-discharge switch circuit and a packaged battery protection chip, wherein the charge-discharge switch circuit and the packaged battery protection chip are integrated in the same Pack; the battery protection chip realizes overcurrent protection by controlling the turn-off of the charge-discharge switch circuit; the battery protection chip is internally provided with a trimming circuit, and the trimming circuit trims the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip based on the resistance value of the target protection current and the charging and discharging switch circuit.
In one possible embodiment of the present invention, the charge-discharge switching circuit includes: a charge control switch and a discharge control switch; the controlled end of the charge control switch is connected with the charge control end CO of the battery protection chip, and the controlled end of the discharge control switch is connected with the discharge control end DO of the battery protection chip.
In a possible embodiment of the present invention, the charge control switch and the discharge control switch are both MOS transistors.
In one possible embodiment of the present invention, the resistance value of the charge-discharge switching circuit is a measured resistance value.
In one possible embodiment of the present invention, the battery protection chip is a lithium battery protection IC.
In one possible embodiment of the present invention, the trimming circuit includes: the first trimming module and the second trimming module;
the first trimming module is used for executing the operation of fusing or not fusing the trimming fuse therein based on the trimming signal determined by the target protection current and the resistance value of the charge-discharge switch circuit under the action of the trimming voltage so as to generate a control signal;
and the second trimming module is used for trimming the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip according to the received control signal.
In one possible embodiment of the present invention, the first trimming module includes:
one or more trimming units, each trimming unit for performing an operation of blowing or not blowing trimming fuses therein according to the trimming voltage and the trimming signal received thereby;
and the one or more detection units are corresponding to the at least one trimming unit and are used for detecting the fusing state of the trimming fuse in the trimming unit corresponding to the detection unit so as to output a control signal.
In one possible embodiment of the present invention, the trimming unit includes:
the trimming switch is connected between the trimming fuse and the trimming voltage and is opened or closed according to the received trimming signal;
and the trimming fuse is used for fusing when the trimming switch is closed.
In one possible embodiment of the present invention, the trimming voltage is introduced into the trimming circuit through a pin of the battery protection chip.
In a possible embodiment of the present invention, the battery protection package further includes:
the temperature detection module is used for detecting the current ambient temperature;
the battery protection chip further includes:
and the temperature compensation module is used for adjusting the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip according to the target resistance value of the charge-discharge switch circuit corresponding to the current ambient temperature.
The invention has the following advantages:
the invention provides a battery protection package body, which integrates a packaged battery protection chip and a charge-discharge switch circuit in the same package body Pack, has higher product integration level, and on the basis, the battery protection chip is internally provided with a trimming circuit, no matter what resistance value charge-discharge switch is selected to be integrated in the same Pack together with the battery protection chip, the battery protection chip can normally realize the charge-discharge overcurrent protection function based on the charge-discharge switch circuit through trimming in the packaging process, but the prior art cannot be solved through trimming in the packaging process and can only be realized through adapting the charge-discharge switch. The scheme realizes the improvement of the suitability of the battery protection chip and the charge-discharge switch, or the matching flexibility of the battery protection chip and the charge-discharge switch, can meet different application requirements and can improve the applicable range. The trimming circuit can trim the battery protection chip in the FT test stage, can effectively ensure trimming precision of the overcurrent detection voltage and/or the overcurrent reference voltage and stability of parameter precision after trimming, and is applicable to high-end chips; in addition, as the battery protection chip and the charge-discharge switch circuit are independent, the layout design difficulty can be reduced, and the overall cost of the scheme can be reduced. Meanwhile, compared with a battery protection system for overcurrent protection based on a precise resistor, the invention can realize high precision of overcurrent protection without the precise resistor and can reduce the cost of a chip.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic diagram of a conventional structure in which a charge/discharge switch and a battery protection circuit are integrated simultaneously in a single chip;
fig. 2 is a schematic structural diagram of a battery protection package and a battery according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a trimming circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery protection package and a battery according to another embodiment of the present invention.
Reference numerals illustrate:
01-Pack, 02-charge and discharge switch circuit, 03-battery protection chip; 04-trimming circuit, 041-first trimming module, 042-second trimming module, 0411-trimming unit, 0412-detecting unit; 05-temperature detection module, 06-temperature compensation module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The embodiment of the invention provides a battery protection package, referring to fig. 2, the battery protection package comprises a charge-discharge switch circuit 02 and a packaged battery protection chip 03, which are integrated in the same Pack01 (which can be called a package); the battery protection chip 03 controls the turn-off of the charge-discharge switch circuit 02 to realize overcurrent protection; the battery protection chip 03 is provided with a trimming circuit 04, and the trimming circuit 04 trims the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip 03 based on the target protection current and the resistance value of the charge-discharge switch circuit 02.
In the embodiment of the invention, since the packaged battery protection chip 03 and the charge-discharge switch circuit 02 are integrated in the same package body Pack01, and the trimming circuit 04 is also arranged in the battery protection chip 03 and can finally leave the factory in the form of the battery protection package body, the invention can select the charge-discharge switch with any resistance specification (it can be understood that the resistance specification is different and the calibration resistance value is different) to be integrated in the same Pack01 with the battery protection chip 03, that is, the charge-discharge switch with any resistance value is selected to be integrated in the same Pack01 with the battery protection chip 03, and then the trimming circuit 04 is used for trimming the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 based on the resistance value of the target protection current and the charge-discharge switch circuit 02 in the packaging process, that is, before the battery protection package body leaves factory. It can be understood that in the same Pack01, no matter what resistance specification of the charge-discharge switch is selected to be connected with the battery protection chip 03, the trimming circuit 04 in the battery protection chip 03 can trim, and finally, the trimming matching property of the resistance specification of the charge-discharge switch and the battery protection chip 03 can be realized in the packaging process, so that the battery protection chip 03 can also effectively realize the overcurrent protection function based on the resistance specification of the charge-discharge switch.
Obviously, in the scheme of the embodiment of the invention, as the charge-discharge switch with any resistance specification is selected and integrated with the battery protection chip 03 in the same Pack01, the over-current protection can be finally and effectively carried out, the suitability of the battery protection chip 03 and the charge-discharge switch is improved, or the matching flexibility of the battery protection chip 03 and the charge-discharge switch is improved, different application requirements can be met, and the applicable range is improved. Specifically, it can be understood from the following aspects:
on the one hand, according to the embodiment of the invention, according to the same application requirement, a charge-discharge switch with any resistance specification can be selected to be integrated in the Pack01 together with the battery protection chip 03, and finally, the trimming circuit 04 in the battery protection chip 03 can also enable the battery protection package to achieve the required overcurrent protection precision when leaving the factory through trimming the overcurrent detection voltage and/or the overcurrent reference voltage.The embodiment of the invention is not limited to the method that only the charge-discharge switch with the unique resistance specification can be selected to be matched with the battery protection chip 03 as in the prior art, and the packaging form of the invention can bring about the reduction of the factory cost. For example, the smaller the resistance value of the charge-discharge switch is, the more expensive the cost is, and based on the current maintenance according to the unified standard, only the charge-discharge switch with the unique resistance specification can be selected, so that the higher the factory cost is; the scheme of the embodiment of the invention can select a charge-discharge switch with a large resistor, and finally meets the application requirement through trimming, so that the factory cost is reduced. For example, in some battery application circuits with high power consumption requirements, the heat generation value q=i is based on 2 The principle of R, the charge-discharge switch with smaller resistance specification and the battery protection chip 03 can be integrated in the Pack01, and finally, the application requirement is met through trimming, so that the heating value of the charge-discharge switch circuit 02 is reduced.
On the other hand, since the embodiment of the invention can integrate the packaged battery protection chip 03 and the charge-discharge switch circuit 02 in the same package Pack01, the invention can select charge-discharge switches with different resistance specifications (it can be understood that the resistance specifications are different and the calibration resistance values are different) for the same battery protection chip 03 according to different application requirements, integrate the charge-discharge switches with the battery protection chip 03 in the Pack01, and then repair the corresponding battery protection chip 03 in the Pack01 according to different application requirements so as to meet different application requirements. Obviously, the invention greatly improves the suitability of the battery protection chip 03 due to the adoption of the Pack01 packaging form.
Meanwhile, as the packaged battery protection chip 03 and the charge-discharge switch circuit 02 are integrated in the same package body Pack01, the battery protection chip 03 can be shipped in the form of a battery protection package body, and the trimming circuit 04 of the embodiment of the invention can trim the battery protection chip 03 in the FT test stage, so that the overcurrent protection precision of the battery protection chip 03 is improved, the problem of precision reduction caused by re-packaging after trimming in the CP test stage is solved, and the trimming precision of the overcurrent detection voltage and/or the overcurrent reference voltage and the stability of the parameter precision after trimming can be effectively ensured.
In addition, the battery protection chip 03 and the charge-discharge switch circuit 02 after being packaged are integrated in the same package body Pack01, and finally the battery protection package body is shipped out of the factory.
In the embodiment of the present invention, pack01 may be understood as a package, but the package is different from the wafer stage to the chip stage package, and the package form of the package may be understood as a system-in-package, so as to integrate the charge/discharge switch circuit 02 and the packaged battery protection chip 03 at the same time, to obtain the battery protection package of the present invention. The battery protection package may finally take on an external form, such as SIP (System In package 01age System In package), among others. Of course, in practice, other external forms may be used, and the invention is not limited thereto.
In the embodiment of the present invention, as shown in fig. 2, the battery protection chip 03 includes a positive power input terminal VDD, a negative power input terminal VSS, a charge control terminal CO, a discharge control terminal DO, and an over-current detection terminal VM, where a VDD terminal is used for connecting with a positive electrode of a battery, a VSS terminal is used for connecting with a negative electrode of the battery, and the charge control terminal CO and the discharge control terminal DO are used for connecting with the charge/discharge switch circuit 02, so as to implement charge/discharge over-current protection of the battery by controlling the turn-off of the charge/discharge switch circuit 02.
The over-current detection terminal VM is connected to the battery cathode through the charge/discharge switch circuit 02, so as to obtain an over-current detection voltage based on the charge/discharge switch circuit 02 and a charge/discharge current (specifically, a charge current or a discharge current) flowing through the charge/discharge switch circuit 02.
As shown in fig. 2, after the charge-discharge switch circuit 02 and the packaged battery protection chip 03 are integrated in the same Pack01, the Pack01 is used as a finished product, and two pins, namely p+ and P-, are respectively led out, and p+ and P-are load pins for connecting the anode and the cathode of a load. If the load is a lamp bead, the P+ pin is used for connecting the anode of the lamp bead, and the P-pin is used for connecting the cathode of the lamp bead.
In the embodiment of the present invention, the charge-discharge switch circuit 02 refers to a circuit including a charge-discharge switch, and specifically may refer to a circuit including a charge-discharge switch and a battery power supply negative input terminal VSS connected to the charge-discharge switch, and since the circuit is usually only a conductive wire, the resistance value of the charge-discharge switch circuit 02 should include at least the resistance value of the charge-discharge switch. Alternatively, the resistance value of the charge-discharge switch circuit 02 according to the present invention may be a calibration resistance value of the charge-discharge switch, or may be an actual measurement resistance value of the charge-discharge switch circuit 02 (i.e., an actual measurement resistance value of the charge-discharge switch+an actual measurement resistance of the lead).
Specifically, as shown in fig. 2, the charge-discharge switching circuit 02 may include: a charge control switch and a discharge control switch; the controlled end of the charge control switch is connected with the charge control end CO of the battery protection chip 03, and the controlled end of the discharge control switch is connected with the discharge control end DO of the battery protection chip 03.
The charge control switch and the discharge control switch may be packaged in the same chip and connected to the charge control terminal CO and the discharge control terminal DO of the battery protection chip 03, and of course, the charge control switch and the discharge control switch may also be separate devices. The invention does not limit the packaging form of the charge control switch and the discharge control switch. Furthermore, the charge control switch and the discharge control switch are both MOS tubes. The MOS transistor may be a Metal-Oxide-semiconductor field effect transistor (MOSFET), as shown in FIG. 2, the charge control switch is represented by MOSFET1, and the discharge control switch is represented by MOSFET 2.
In practical application, after the battery protection package is connected to the battery, as shown in fig. 2, the battery protection chip 03 may obtain an overcurrent detection voltage from an overcurrent detection end (indicated by VM in the drawing) based on a charge-discharge current (specifically, a charge current or a discharge current) in a charge-discharge circuit where the battery is located and the charge-discharge switch circuit 02, and then compare the overcurrent detection voltage with an overcurrent reference voltage in the chip, so as to determine whether the battery is overcharged or overdischarged. When the battery is in a charged state, the over-current detection voltage obtained by the battery protection chip 03 from the over-current detection end is a charging over-current detection voltage, and the battery protection chip 03 compares the charging over-current detection voltage with a charging over-current reference voltage to judge whether the battery is charged or not; when the battery is in a discharging state, the battery protection chip 03 obtains a discharging overcurrent detection voltage from the overcurrent detection end, and the battery protection chip 03 compares the discharging overcurrent detection voltage with a discharging overcurrent reference voltage to judge whether the battery is in a discharging overcurrent state. When the battery is normally charged, the charge control switch and the discharge control switch are in a conducting state; when the battery is determined to be charged and overcurrent, the battery protection chip 03 controls the charge control switch to be turned off through the charge control end CO thereof so as to terminate charging. When the battery is normally discharged, the charge control switch and the discharge control switch are in a conducting state; when it is determined that the battery has discharge overcurrent, the battery protection chip 03 controls the discharge control switch to be turned off through the discharge control terminal DO thereof to terminate the discharge.
Generally, the battery has a rated overcurrent protection current, such as 10mA (milliamp), and the target protection current of the present invention is a current actually triggering an overcurrent protection point, which can be understood as a current value of the overcurrent protection point, specifically, 10mA, and possibly lower than 10mA, such as 9.8mA or 9.5mA. The target protection current may be obtained by a test person through a test based on the calibrated overcurrent protection current. In a specific test, a test machine generally inputs a target current lower than the calibrated overcurrent protection current to the charge-discharge switch circuit 02, and detects whether the battery protection chip 03 turns off the charge-discharge switch circuit 02 under the target current (i.e., triggers overcurrent protection), so as to take the target current triggering the overcurrent protection as the target protection current.
For example, when the battery is in a charged state, the battery protection chip 03 determines that the battery is overcharged based on the charging current and the detected voltage for the charging and the discharging switch circuit 02, and when the detected voltage for the charging and the discharging is less than or equal to the reference voltage for the charging and the discharging, the battery protection chip determines that the battery is overcharged. The charging current when the battery is charged and overcharged can be regarded as a target protection current.
For example, when the battery is in a discharging state, the battery protection chip 03 determines that the battery is over-discharged based on the discharging current and the over-discharging detection voltage acquired by the charging/discharging switching circuit 02, and when the over-discharging detection voltage is greater than or equal to the over-discharging reference voltage. The discharge current when the battery is discharged and overcurrent is considered as a target protection current.
The trimming circuit 04 of the present invention may have different embodiments, so as to trim the over-current detection voltage or the over-current reference voltage of the battery protection chip 03, or trim the over-current detection voltage and the over-current reference voltage of the battery protection chip 03.
In some embodiments, the trimming circuit 04 trims the over-current detection voltage of the battery protection chip 03 based on the target protection current and the resistance value of the charge-discharge switch circuit 02, which can be understood as trimming the over-current detection voltage to be close to the corresponding over-current reference voltage, where the approaching can be characterized as a difference between the over-current detection voltage when the battery is normally charged and the over-current detection voltage when the battery is charged or a difference between the over-current detection voltage when the battery is normally discharged and the over-current detection voltage when the battery is discharged, so that the battery protection chip 03 can determine the charge-discharge over-current condition of the battery, and effectively implement the over-current protection function. After trimming, since the trimming signal for trimming the over-current detection voltage is fixed, when the charge and discharge current of the battery changes, the over-current detection voltage at the over-current detection end also changes correspondingly, so that the voltage of the over-current detection voltage after trimming by the trimming circuit 04 also changes, and by comparing with the over-current reference voltage, whether the battery is charged or discharged over-current can be effectively detected.
In other embodiments, the trimming circuit 04 trims the over-current reference voltage of the battery protection chip 03 based on the target protection current and the resistance value of the charge-discharge switching circuit 02. The voltage generated based on the target protection current and the resistance value of the charge/discharge switching circuit 02 is regarded as a target voltage, and the target voltage is considered to be a threshold voltage that triggers the overcurrent protection in a true sense. In the current battery protection chip 03, the over-current reference voltage is usually set based on the calibration resistance value of the charge-discharge switch and the target protection current, but due to the problem of the precision of the reference source, there may be an error between the over-current reference voltage generated based on the reference source and the target voltage.
The principle of trimming both the over-current detection voltage and the over-current reference voltage is similar to that described above, except that the trimming circuit 04 may be slightly different in structure and may need to cooperate with some timing control, and the relevant explanation of the trimming circuit 04 will be referred to later herein.
Further, the trimming circuit 04 may trim the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 based on the trimming signal determined by the target protection current and the resistance value of the charge/discharge switch circuit 02. Wherein the trimming signal may be generated by: the method comprises the steps of obtaining target voltage based on a calibration resistance value of a charge-discharge switch and a target protection current, calculating a difference value between the target voltage and an overcurrent reference voltage generated based on a reference source, and then processing the difference value and the trimming stepping value by setting a proper trimming stepping value, so that a corresponding trimming signal can be obtained. In the actual test, after the target voltage and the over-current reference voltage are obtained, the process of generating the trimming signal may be completed in the FT tester, or may be input into the chip by the FT tester and calculated and generated by the chip, which is not limited in this embodiment.
Since the target protection current of the battery in the charging state and the target protection current of the battery in the discharging state are different, the trimming circuit 04 can trim the charging overcurrent detection voltage and/or the charging overcurrent reference voltage of the battery protection chip 03 based on the target charging protection current and the resistance value of the charging and discharging switch circuit 02; similarly, the trimming circuit 04 may trim the discharge overcurrent detection voltage and/or the discharge overcurrent reference voltage of the battery protection chip 03 based on the target discharge protection current and the resistance value of the charge-discharge switching circuit 02.
In the implementation process of the invention, the inventor further discovers that the calibration resistance value and the actual resistance value of the charge-discharge switch may deviate, so that the overcurrent protection effect of the scheme in actual application is not ideal, and the problem of overcurrent protection precision exists. For example, the resistances of the charging control switches are 5 milliohms, that is, the calibration resistances of the charging control switches are 5 milliohms, and because of factors such as process deviation in the manufacturing process of the charging and discharging switches, the actual resistance of some charging control switches is 5.1 milliohms, and the actual resistance of some charging control switches may be 4.8 milliohms. When the battery protection chip 03 and the charge-discharge switch with a certain resistance specification are integrated in the same Pack01, the battery protection chip 03 controls the charge-discharge switch circuit 02 to perform the over-current protection based on the actual resistance value and the charge-discharge current of the charge-discharge switch circuit 02, and in the current battery protection chip 03, the over-current reference voltage is basically set based on the calibration resistance value and the target protection current of the charge-discharge switch, so that the over-current protection point of the battery is inaccurate, if the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 are still modified based on the calibration resistance value of the charge-discharge switch at this time, the problem of over-current protection precision caused by the possible deviation between the calibration resistance value and the actual resistance value of the charge-discharge switch cannot be overcome, even the deviation can be increased, and the over-current protection precision is further reduced.
In view of this, on the basis of the battery protection package of the present invention, the embodiment of the present invention proposes a further improvement scheme: the trimming circuit 04 trims the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip 03 based on the target protection current and the actual measured resistance value of the charge-discharge switch circuit 02, so that the problem of overcurrent protection precision caused by deviation between the actual resistance value of the charge-discharge switch and the calibrated resistance value of the charge-discharge switch can be effectively solved.
Obviously, the actual resistance value of the charge-discharge switch circuit 02 is the actual resistance value, unlike the scheme that the same batch of wafers are generally trimmed according to the charge-discharge switch with the same calibration resistance value pointed out in the background art, the trimming mode provided by the embodiment of the invention is targeted, and even for the same batch of battery protection packages, namely, the battery protection chips 03 in each battery protection package are the same, the calibration resistance values of the charge-discharge switches connected with the battery protection chips 03 are the same, but due to the different actual resistance values of the charge-discharge switches, the trimming modes in each battery protection package are also different. The invention can consider that the battery protection chips 03 and the charge-discharge switches connected with the battery protection chips 03 are in one-to-one trimming relationship to a certain extent, and each battery protection chip 03 is unique in trimming the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip 03 based on the actual measured resistance value of the target protection current and the charge-discharge switches connected with the target protection current.
Since the battery protection chip 03 and the charge-discharge switch with a certain resistance specification are integrated in the same Pack01, the battery protection chip 03 controls the charge-discharge switch circuit 02 to perform the overcurrent protection based on the actual resistance value and the charge-discharge current of the charge-discharge switch circuit 02, the embodiment of the invention can very easily measure the actual resistance value of the charge-discharge switch circuit 02 in the FT (Final Test) Test stage, and then the trimming circuit 04 trims the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip 03 based on the target protection current and the actual resistance value of the charge-discharge switch circuit 02 in the FT Test stage.
The measured resistance value of the charge/discharge switching circuit 02 may be obtained by testing the charge/discharge switching circuit 02 based on a test current. The actual test procedure may be as follows: after integrating the charge-discharge switch circuit 02 and the packaged battery protection chip 03 in the same Pack01, a test current can be input to the charge-discharge switch circuit 02 by using a tester in the FT test stage, the battery protection chip 03 can sample at an overcurrent detection end (VM) of the charge-discharge switch circuit 02 based on the test current and the charge-discharge switch circuit 02 to obtain a test voltage, and the actual measured resistance value of the charge-discharge switch circuit 02 can be obtained by dividing the test voltage by the test current as the test current is known.
On the basis, since the target protection currents of the battery in the charging state and the discharging state are different, the trimming circuit 04 can trim the charging overcurrent detection voltage and/or the charging overcurrent reference voltage of the battery protection chip 03 based on the target charging protection current and the measured resistance value of the charging and discharging switch circuit 02; similarly, the trimming circuit 04 may trim the discharge overcurrent detection voltage and/or the discharge overcurrent reference voltage of the battery protection chip 03 based on the target discharge protection current and the measured resistance value of the charge-discharge switching circuit 02.
Based on the foregoing inventive concept, the circuit configuration of the trimming circuit 04 of the present invention will be described next.
In an embodiment of the present invention, as shown in fig. 3, the trimming circuit 04 includes: a first trimming module 041 and a second trimming module 042; the first trimming module 041 is configured to perform an operation of blowing or not blowing a trimming fuse therein based on a trimming signal determined by the target protection current and the resistance value of the charge-discharge switching circuit 02 under the effect of the trimming voltage, so as to generate a control signal; the second trimming module 042 is configured to trim the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 according to the received control signal.
In this embodiment, since the battery protection chip 03 of the present invention is a packaged chip, in the FT test stage, the trimming voltage is introduced into the trimming circuit 04 through the pin of the battery protection chip 03, and specifically, the first trimming module 041 in the trimming circuit 04 is introduced. The trimming signal determined based on the target protection current and the resistance value of the charge-discharge switch circuit 02 can control whether the corresponding trimming fuse is conducted with the trimming voltage, so that the trimming fuse is fused based on the current generated by the trimming voltage, and the trimming purpose is achieved. After the trimming fuses are blown, the related potential of the branch where the trimming fuses are located changes, the first trimming module 041 outputs the potential change as a logic '1' or logic '0' level signal, and finally, one or more trimming fuses in the first trimming module 041 execute the blowing or non-blowing operation based on the trimming signals to obtain the logic signal which is the control signal.
The second trimming module 042 is configured to trim the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 according to the received control signal. The second trimming module 042 may be connected to a detecting end, a reference source, etc. of the over-current detecting voltage, and its structure may specifically be composed of a controlled switch and a plurality of resistors, or a controlled switch and a current mirror structure, or a controlled switch, a plurality of resistors, a current mirror structure, etc. Based on different structures of the second trimming module 042, the controlled switch can control the resistance value of the resistor structure formed by a plurality of resistors or control the mirror proportion of the current mirror based on the control signal. By changing the resistance value or the mirror proportion of the resistor structure, the over-current detection voltage and/or the over-current reference voltage can be changed, and the accuracy of the over-current detection voltage and/or the over-current reference voltage can be modified. Based on different applications, different trimming means and trimming structures can be adopted, and the related prior art can be referred to, so that the invention is not limited.
Further, in an embodiment of the present invention, as shown in fig. 3, the first trimming module 041 includes:
one or more trimming units 0411, each trimming unit 0411 being configured to perform an operation of blowing or not blowing a trimming fuse therein according to the trimming voltage and the trimming signal received by the trimming unit 0411;
one or more detecting units 0412, where each detecting unit 0412 corresponds to at least one trimming unit 0411, and is configured to detect a blown state of a trimming fuse in the trimming unit 0411 corresponding to the detecting unit 0412, so as to output a control signal.
Wherein, repair unit 0411 includes: a trimming switch (not shown) and a trimming fuse (not shown). The trimming switch is connected between the trimming fuse and the trimming voltage and is opened or closed according to the received trimming signal; the trimming fuse is used for fusing when the trimming switch is closed. When trimming voltage is introduced through the pins of the battery protection chip 03, the plurality of trimming switches execute opening or closing operation according to the received trimming signals, so that the trimming fuses connected with the trimming switches execute fusing or non-fusing operation. The trimming switch can be composed of MOS tubes, and the grid electrode of the MOS tube is used as a controlled end for receiving a corresponding trimming code in the trimming signal.
Each detection unit 0412 corresponds to at least one trimming unit 0411 and includes two embodiments: the first is that the detecting unit 0412 and the trimming unit 0411 are in one-to-one correspondence, and the second is that the detecting unit 0412 and the trimming unit 0411 are in one-to-many correspondence. For the relation that the detection units 0412 and the trimming units 0411 are in one-to-one correspondence, each trimming unit 0411 is in one-to-one correspondence with a trimming code in a trimming signal, each trimming unit 0411 enables a trimming fuse in the trimming unit 0411 to execute fusing or non-fusing operation based on the corresponding trimming code in the trimming signal, and a logic signal output by each detection unit 0412 is a fusing result of the fuse in the corresponding trimming unit 0411; for the relation that the detecting units 0412 and the trimming units 0411 are one-to-many, trimming codes in trimming signals received by a plurality of trimming units 0411 connected with the same detecting unit 0412 are the same, each trimming unit 0411 enables a trimming fuse in the trimming unit 0411 to execute fusing or non-fusing operation based on the corresponding trimming code in the trimming signal, and a logic signal output by each detecting unit 0412 is a result obtained by performing OR operation on fuse fusing results in the corresponding plurality of trimming units 0411. Finally, the first trimming module 041 takes the logic signals output by all the detection units 0412 as the control signals.
It should be noted that, in the one-to-many trimming scheme provided by the embodiment of the present invention in which the detecting unit 0412 and the trimming unit 0411 are one-to-many, one trimming unit 0411 connected to the same detecting unit 0412 is the main trimming unit 0411, and the rest trimming units 0411 are the backup trimming units 0411 of the trimming unit 0411.
It can be appreciated that, corresponding to the plurality of detection units 0412, the control signal also has a plurality of control bits, and the second trimming module 042 can enable the corresponding controlled switch to be opened or closed based on different control bits in the control signal, so that the corresponding resistor is connected to the resistor structure or the corresponding MOS transistor is connected to the current mirror structure, and the resistance value of the resistor structure is changed or the mirror proportion is changed, so as to trim the overcurrent detection voltage and/or the overcurrent reference voltage. The detection unit 0412 may be implemented by using some comparison circuits, where the detection unit 0412 outputs a detection result as a control signal based on the difference of voltages before and after the trimming fuse is blown. The comparison circuit structure can refer to the related prior art, and various embodiments are not limited herein.
Considering that the resistance value of the charge-discharge switch may drift due to the influence of temperature, and thus may influence the over-current protection precision, in an embodiment of the present invention, the following scheme is further provided: as shown in fig. 4, the battery protection package further includes a temperature detection module 05; the battery protection chip 03 further includes a temperature compensation module 06. The temperature detection module 05 is used for detecting the current environment temperature; the temperature compensation module 06 is configured to adjust the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 according to a target resistance value of the charge/discharge switch circuit 02 corresponding to the current ambient temperature. According to the embodiment of the invention, the battery protection chip 03 can effectively realize the overcurrent protection function based on the charge-discharge switch with a certain resistance specification, the influence of temperature on the resistance value of the charge-discharge switch is further considered, the target resistance value of the charge-discharge switch circuit 02 with the resistance specification corresponding to the current environment temperature is determined under the charge-discharge switch with the resistance specification, and then the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip 03 are regulated by the temperature compensation module 06 based on the target resistance value, so that the problem of resistance value drift of the charge-discharge switch caused by temperature can be effectively solved, and the overcurrent protection precision can be improved.
The temperature detection module 05 is a device having a temperature detection function, and may be a positive temperature coefficient thermistor, a negative temperature coefficient thermistor, a resistance temperature detector, an on-chip temperature sensor, or the like, which is not limited in this embodiment. The temperature detection module 05 is disposed in the battery protection package, and may have the following connection structure: in an embodiment, the temperature detection module 05 may be integrated with the charge-discharge switch on the Pack01 to accurately detect the current ambient temperature of the charge-discharge switch circuit 02, and then the temperature detection module 05 transmits the detected current ambient temperature to the chip through the pin of the battery protection chip 03; in another embodiment, the temperature detection module 05 may also be integrated in the battery protection chip 03 to detect the current ambient temperature, and this way has a higher integration level, but is affected by the heat generated inside the chip, so that the detection accuracy is slightly lower.
The battery protection chip 03 is provided with a temperature compensation module 06 and a memory, and the memory can store the corresponding relation between the resistance value of the charge-discharge switch circuit 02 and different environmental temperatures, wherein after the resistance specification of the charge-discharge switch circuit 02 which is required to be integrated with the packaged battery protection chip 03 in the same Pack01 is predetermined, the corresponding relation between a plurality of resistance values of the charge-discharge switch circuit 02 with the resistance specification and a plurality of temperatures is written into the battery protection chip 03, and the corresponding relation can be expressed in a temperature curve mode. After the temperature compensation module 06 obtains the current ambient temperature transmitted by the temperature detection module 05, based on the corresponding relationship, a target resistance value of the charge/discharge switch circuit 02 may be determined, and then the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip 03 may be adjusted by using the target resistance value. After the trimming circuit 04 trims the over-current detection voltage and/or the over-current reference voltage of the battery protection chip 03 based on the target protection current and the resistance value of the charge-discharge switch circuit 02, the temperature compensation module 06 further adjusts the trimmed over-current detection voltage and/or the trimmed over-current reference voltage based on the difference between the target resistance value of the charge-discharge switch circuit 02 corresponding to the current ambient temperature and the resistance specification (calibration resistance value), so as to solve the problem of reduced over-current protection precision caused by temperature drift. The specific circuit structure of the temperature compensation module 06 can refer to the related art, and the description of this embodiment is omitted here.
In fig. 4, the explanation of the positive power input terminal VDD, the negative power input terminal VSS, the charge control terminal CO, the discharge control terminal DO, and the over-current detection terminal VM of the battery protection chip 03, and the explanation of the pins p+ and P-are referred to above, and are not repeated herein.
The above figures are only examples, and other devices such as capacitors, resistors, etc. may be included in the battery protection package, which is not limited by the present invention.
In an application of the present invention, the battery protection chip 03 may be a lithium battery protection IC. The invention relates to a battery protection package body, which comprises a charge-discharge switch circuit 02 and a packaged lithium battery protection IC (integrated circuit) which are integrated in the same Pack01, wherein in the battery protection package body, the lithium battery protection IC realizes overcurrent protection by controlling the turn-off of the charge-discharge switch circuit; the trimming circuit 04 is arranged in the lithium battery protection IC, and the trimming circuit 04 trims the overcurrent detection voltage and/or the overcurrent reference voltage of the lithium battery protection IC based on the target protection current and the resistance value of the charge-discharge switch circuit 02. The packaged lithium battery protection IC and the charge-discharge switch circuit 02 are integrated in the same package body Pack01, and the lithium battery protection IC has a trimming function, and finally leaves a factory in a battery protection package body, so that the integration level of a product is ensured, the flexibility of matching the lithium battery protection IC and the charge-discharge switch is improved, and the application range of the lithium battery protection IC can be increased. The invention can adopt FT trimming to enable the charge-discharge switch circuit 02 of the lithium battery protection IC based on the resistance value to effectively realize the charge-discharge overcurrent protection function by trimming after the lithium battery protection IC and the charge-discharge switch circuit 02 with any resistance value are integrated in the same Pack01, thereby ensuring the stability of the overcurrent protection precision after trimming.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present contribution to the art may be better appreciated. While various modifications of the embodiments and applications of the invention will occur to those skilled in the art, it is not necessary and not intended to be exhaustive of all embodiments, and obvious modifications or variations of the invention are within the scope of the invention.
Claims (10)
1. A battery protection package is characterized in that,
the battery protection device comprises a charge-discharge switch circuit and a packaged battery protection chip which are integrated in the same Pack;
the battery protection chip realizes overcurrent protection by controlling the turn-off of the charge-discharge switch circuit;
And the trimming circuit trims the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip based on the target protection current and the resistance value of the charge-discharge switch circuit.
2. The battery protection package of claim 1, wherein the battery protection package comprises a plurality of battery protection layers,
the charge-discharge switching circuit includes: a charge control switch and a discharge control switch;
the controlled end of the charge control switch is connected with the charge control end CO of the battery protection chip, and the controlled end of the discharge control switch is connected with the discharge control end DO of the battery protection chip.
3. The battery protection package of claim 2, wherein the battery protection package comprises a plurality of battery protection layers,
the charging control switch and the discharging control switch are both MOS tubes.
4. The battery protection package of claim 1, wherein the battery protection package comprises a plurality of battery protection layers,
the resistance value of the charge-discharge switch circuit is an actual measurement resistance value.
5. The battery protection package of claim 1, wherein the battery protection package comprises a plurality of battery protection layers,
the battery protection chip is a lithium battery protection IC.
6. The battery protection package according to any one of claims 1 to 5, wherein,
The trimming circuit comprises: the first trimming module and the second trimming module;
the first trimming module is used for executing the operation of fusing or not fusing the trimming fuse therein based on the trimming signal determined by the target protection current and the resistance value of the charge-discharge switch circuit under the action of the trimming voltage so as to generate a control signal;
and the second trimming module is used for trimming the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip according to the received control signal.
7. The battery protection package of claim 6, wherein the battery protection package comprises a plurality of battery protection layers,
the first trimming module comprises:
one or more trimming units, each trimming unit for performing an operation of blowing or not blowing a trimming fuse therein according to the trimming voltage and the trimming signal received by the trimming unit;
and the one or more detection units are corresponding to at least one trimming unit and are used for detecting the fusing state of the trimming fuse in the trimming unit corresponding to the detection unit so as to output the control signal.
8. The battery protection package of claim 7, wherein the battery protection package comprises a plurality of battery protection layers,
the trimming unit comprises:
The trimming switch is connected between the trimming fuse and the trimming voltage and is opened or closed according to the received trimming signal;
and the trimming fuse is used for fusing when the trimming switch is closed.
9. The battery protection package of claim 6, wherein the battery protection package comprises a plurality of battery protection layers,
the trimming voltage is introduced into the trimming circuit through a pin of the battery protection chip.
10. The battery protection package according to any one of claims 1 to 5, wherein,
the battery protection package further includes:
the temperature detection module is used for detecting the current ambient temperature;
the battery protection chip further includes:
and the temperature compensation module is used for adjusting the overcurrent detection voltage and/or the overcurrent reference voltage of the battery protection chip according to the target resistance value of the charge-discharge switch circuit corresponding to the current ambient temperature.
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| CN117394508B (en) | 2024-04-02 |
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