CN104319741A - Battery cell scanning circuit and method for battery protection chip - Google Patents
Battery cell scanning circuit and method for battery protection chip Download PDFInfo
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- CN104319741A CN104319741A CN201410584319.3A CN201410584319A CN104319741A CN 104319741 A CN104319741 A CN 104319741A CN 201410584319 A CN201410584319 A CN 201410584319A CN 104319741 A CN104319741 A CN 104319741A
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Abstract
The invention relates to a battery cell scanning circuit and method for a battery protection chip. The method comprises the steps that a gating device enables corresponding battery cells to be connected according to preset gating rules; the preset gating rules comprise that the absolute value of the potential difference between the positive electrode of the currently connected battery cell and the positive electrode of the next connected battery cell is smaller than or equal to a first threshold value, and the absolute value of the potential difference between the positive electrode of the currently connected battery cell and the positive electrode of the former connected battery cell is smaller than or equal to the first threshold value; a part of or all the battery cells will be connected one by one; the connected battery cell will be connected again after a period of time; a detection circuit detects the voltage of the currently connected battery cell. According to the embodiment of the battery cell scanning circuit and method for the battery protection chip, the voltage jump amplitude between the positive end and the negative end of the detection circuit is reduced, the time for the detection circuit to establish a stable working point is shortened, and detection precision is improved.
Description
Technical field
The present invention relates to electronic applications, particularly relate to a kind of battery core scanning circuit and method of battery protection chip.
Background technology
Need at electric bicycle, electric automobile etc. to use in the industry of battery protection chip, often provide sufficiently high voltage and enough large electric current by multiple batteries series and parallel connections.
In battery protection chip, common voltage detecting mode has continuous detection mode and Scanning Detction mode.Wherein, continuous detection mode has a testing circuit in continuous operation for each battery core voltage, and its advantage is that each battery core voltage can detect in real time, does not have scanning errors, but shortcoming to be the power consumption of multiple testing circuit high, shared area is large; Scanning Detction mode is according to certain scanning sequency and the multiplexing testing circuit of scanning frequency, advantage is that multiplexing testing circuit is low in energy consumption, shared area is little, shortcoming has scanning errors, but the conversion rate of the battery core voltage relative to battery, scanning errors impact is also little, so Scanning Detction mode is more in actual applications.
In battery protection chip, the order adopting Scanning Detction mode is generally go up most economize on electricity core by descending most economize on electricity core to scan, or scans descend economize on electricity core most, such as, when having 6 battery cores by going up most economize on electricity core; Scanning Detction mode is: 1,2,3,4,5; 6,1,2,3,4; 5,6 ... or 6,5,4,3; 2,1,6,5; 4,3,2,1 ...Like this when after the scanning completing one-period, by the highest economize on electricity core voltage jump to lowest section battery core voltage, or on the contrary.This is for the positive and negative terminal of testing circuit; there is larger voltage jump amplitude; such as, when having 6 battery cores in battery protection chip, when carrying out next sense cycle from a sense cycle; when adopting Scanning Detction mode; there is the amplitude of 5 battery core voltages, such testing circuit needs the longer time to set up stable working point, affects battery core voltage detecting precision; limit the minimum detection time of each battery core, thus limit scanning frequency.
Continue the battery core for battery protection chip with 6 cascades, when the order of Scanning Detction mode is: 1,2,3,4; 5,6,1,2,3; 4,5,6 ... time, as shown in Figure 1a, Fig. 1 a is battery core voltage one schematic diagram that the Scanning Detction mode of prior art obtains to the voltage waveform of electric circuit inspection module.When the order of Scanning Detction mode is: 6,5,4,3,2,1,6,5,4,3,2,1 ... time, as shown in Figure 1 b, Fig. 1 b is the another schematic diagram of battery core voltage that the Scanning Detction mode of prior art obtains to the voltage waveform of electric circuit inspection module.
It can thus be appreciated that; for the battery protection chip with n economize on electricity core; V+ and V-for electric circuit inspection module holds, and (V+ end is the positive terminal voltage of electric circuit inspection module; V-end is the negative terminal voltage of electric circuit inspection module), there is the voltage jump of (n-1) * V amplitude in traditional Scanning Detction mode.
Summary of the invention
The object of this invention is to provide a kind of battery core scan method of battery protection chip, with the problem that the positive and negative terminal voltage jump amplitude solving battery protection chip is larger.
First aspect, embodiments provide a kind of battery core scanning circuit of battery protection chip, described circuit comprises:
Multiple battery cores of series connection;
Gate, presets the corresponding battery core of gating rule gating for basis; Described default gating rule comprises: the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold; Some or all battery core all can by gating one by one; The selected battery core passed through is will by gating again after a period of time;
Testing circuit, for detecting the voltage of the current described battery core be strobed.
Preferably, described gate comprises number generator and gating unit;
Described number generator, for exporting count value according to presetting counting rule, one in multiple battery cores of each count value correspondence series connection;
Gating unit, the battery core that this count value of count value gating for exporting according to described number generator is corresponding.
Preferably, described first threshold is specially: (n-3) * V, and wherein, n is the number of battery core in described battery protection chip, n >=4, and V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum.
Preferably, described circuit also comprises: the electric capacity equal with described battery core quantity, the resistance equal with described battery core quantity, the switch of described battery core quantity 2 times, corresponding first switch of battery core described in each and second switch;
One end of first switch of each battery core in described battery core is connected to the negative pole of described each battery core, the other end of the first switch of described each battery core is connected to the first test side of described testing circuit, the second switch of described each battery core is connected to the positive pole of this battery core after the resistance of this battery core, the other end of the second switch of described each battery core is connected to the second test side of described testing circuit, and the Capacitance parallel connection of described each battery core is between first switch and the second switch of the first battery core of this battery core.
Preferably, described circuit also comprises:
Described gate when determining a gating battery core, then controls the first switch corresponding to this battery core and second switch conducting simultaneously;
Described gate determine not a gating battery core time, then control the first switch corresponding to this battery core and second switch ends simultaneously.
Preferably, described default gating rule is specially,
According to multiple battery cores of the order of connecting successively gating series connection;
After the battery core with the highest positive electrode potential is strobed, the battery core with time high positive electrode potential be adjacent is strobed;
After the battery core with minimum positive electrode potential is strobed, the battery core with time low positive electrode potential be adjacent is strobed.
Second aspect, embodiments provides a kind of battery core scan method of battery protection chip, and be applied to the battery core scanning circuit of battery protection chip, described method comprises:
Gate is according to the corresponding battery core of default gating rule gating; Described default gating rule comprises: the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold; Some or all battery core all can by gating one by one; The selected battery core passed through is will by gating again after a period of time;
Testing circuit detects the voltage of the current described battery core be strobed.
Preferably, described preset count rule comprises: each battery core often organizing the corresponding all series connection of individual count value difference in count value.
Preferably, described gate comprises number generator and gating unit;
Described number generator exports count value according to default counting rule, one in multiple battery cores of each count value correspondence series connection;
The battery core that gating unit is corresponding according to this count value of count value gating that described number generator exports.
Preferably, described first threshold is specially: (n-3) * V, and wherein, n is the number of battery core in described battery protection chip, n >=4, and V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum.
Preferably, described default gating rule is specially,
According to multiple battery cores of the order of connecting successively gating series connection;
After the battery core with the highest positive electrode potential is strobed, the battery core with time high positive electrode potential be adjacent is strobed;
After the battery core with minimum positive electrode potential is strobed, the battery core with time low positive electrode potential be adjacent is strobed.
The battery core scanning circuit of the battery protection chip that the application embodiment of the present invention provides and method, the gating of the battery core of battery protection chip is controlled by gate, with the scanning of the battery core of gating, and the voltage of the battery core of gating is detected by testing circuit, decrease the voltage jump amplitude of testing circuit positive and negative terminal, thus reduce the time that testing circuit sets up stable operating point, improve accuracy of detection, sweep speed can be improved simultaneously, by the change to sweep speed, further facilitate the scan efficiency of battery protection chip when battery equilibrium electric discharge or outside selection signal change.
Accompanying drawing explanation
Fig. 1 a is battery core voltage one schematic diagram that the Scanning Detction mode of prior art obtains;
Fig. 1 b is the another schematic diagram of battery core voltage that the Scanning Detction mode of prior art obtains;
The battery core scan method flow chart of the battery protection chip that Fig. 2 provides for the embodiment of the present invention;
The battery core scanning circuit figure of the battery protection chip that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 a is battery core voltage one schematic diagram obtained based on the battery core scan method one of the battery protection chip of Fig. 2;
Fig. 4 b is the another schematic diagram of battery core voltage obtained based on the battery core scan method one of the battery protection chip of Fig. 2;
Fig. 5 a is battery core voltage one schematic diagram obtained based on the battery core scan method two of the battery protection chip of Fig. 2;
Fig. 5 b is the another schematic diagram of battery core voltage obtained based on the battery core scan method two of the battery protection chip of Fig. 2;
Fig. 6 a is the battery core scan method three of the battery protection chip based on Fig. 2, the battery core V diagram when battery core is 3;
Fig. 6 b is the battery core scan method three of the battery protection chip based on Fig. 2, the battery core V diagram when battery core is 4;
Fig. 6 c is the battery core scan method three of the battery protection chip based on Fig. 2, the battery core V diagram when battery core is 5;
Fig. 6 d is the battery core scan method three of the battery protection chip based on Fig. 2, the battery core V diagram when battery core is 6.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For ease of the understanding to the embodiment of the present invention, be further explained explanation below in conjunction with accompanying drawing with specific embodiment, embodiment does not form the restriction to the embodiment of the present invention.
Describe the battery core scan method of the battery protection chip that the embodiment of the present invention one provides below in detail for Fig. 2, the battery core scan method flow chart of the battery protection chip that Fig. 2 provides for the embodiment of the present invention, as shown in Figure 2, the present embodiment comprises the following steps:
S210, gate is according to the corresponding battery core of default gating rule gating; Described default gating rule comprises: the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold; Some or all battery core all can by gating one by one; The selected battery core passed through is will by gating again after a period of time.
Optionally, described gate comprises number generator and gating unit;
Described number generator exports count value according to default counting rule, one in multiple battery cores of each count value correspondence series connection;
The battery core that gating unit is corresponding according to this count value of count value gating that described number generator exports.Below in conjunction with Fig. 3, concrete description is done to S210.The battery core scanning circuit figure of the battery protection chip that Fig. 3 provides for the embodiment of the present invention; example and non-limiting; there to be 6 battery cores in battery protection chip; connect between these 6 battery cores, these 6 battery cores are respectively the first battery core V1, the second battery core V2; 3rd battery core V3; 4th battery core V4, the 5th battery core V5, the 6th battery core V6.Wherein, the first switch S 1S of the first battery core V1 corresponding first electric capacity C1, the first resistance R1, the first battery core V1, the second switch S1D of the first battery core V1.
One end of the first switch S 1S of the first battery core V1 is connected to the negative pole of the first battery core V1, the other end of the first switch S 1S of the first battery core V1 is connected to the first test side of described testing circuit, the second switch S1D of described first battery core V1 is connected to the positive pole of the first battery core V1 after the first resistance R1 of the first battery core V1, the other end of the second switch S1D of the first battery core V1 is connected to the second test side of testing circuit, and the first electric capacity C1 of the first battery core V1 is connected in parallel between the first switch S 1S of the first battery core V1 and the second switch S1D of the first battery core V1.
Second battery core V2 ... the annexation of the 6th battery core V6 and the identical of the first battery core V1, repeat no more herein.
Alternatively, described gate when determining a gating battery core, then controls the first switch corresponding to this battery core and second switch conducting simultaneously;
Described gate determine not a gating battery core time, then control the first switch corresponding to this battery core and second switch ends simultaneously.
Number generator exports count value according to default counting rule, such as, counting rule can be that number generator exports count value at Second Threshold scope Inner eycle, Second Threshold scope can be 10, and now, number generator exports 1 within a count cycle, 2 ... 10, within the next count cycle, export 1 again, 2 ... 10.Example and non-limiting, number generator can be counter.
Within a count cycle, some or all battery core all can by gating one by one.The battery core be strobed will, by gating again, wherein, can be at next cycle after a period of time, and the battery core be strobed can by gating again, also can within a count cycle, and a battery core is strobed twice or more.
In order to reduce voltage jump amplitude, can in hardware circuit designed in advance good gating rule, also can in the mode of software, the good gating rule of designed in advance, to reduce the time that testing circuit sets up stable operating point, shorten the minimum detection time of each battery core and improve accuracy of detection.
In one embodiment; for battery protection chip, there are 6 battery cores; counting rule is that number generator exports count value at Second Threshold scope Inner eycle; Second Threshold is 10, and namely number generator produces count value 1,2 a count cycle; 3 ... 10; next cycle produces again count value 1, and 2,3 ... 10.
Preset gating rule to be specially, according to multiple battery cores of the order of connecting successively gating series connection;
After the battery core with the highest positive electrode potential is strobed, the battery core with time high positive electrode potential be adjacent is strobed;
After the battery core with minimum positive electrode potential is strobed, the battery core with time low positive electrode potential be adjacent is strobed.
When count value is 1,2,3,4,5,6,7,8,9, when 10, according to the gating rule preset, the corresponding gating first battery core V1 of gate, the second battery core V2, the 3rd battery core V3,4th battery core V4, the 5th battery core V5, the 6th battery core V6, the 5th battery core V5, the 4th battery core V4, the 3rd battery core V3, the second battery core V2; Or, corresponding gating the 6th battery core V6 of gate, the 5th battery core V5, the 4th battery core V4, the 3rd battery core V3, the second battery core V2, the first battery core V1, the second battery core V2, the 3rd battery core V3, the 4th battery core V4, the 5th battery core V5.
Particularly, in a count cycle (count cycle is hereinafter referred to as the cycle), when current count value is 1, gate can gating first battery core V1, the i.e. first switch S 1S of conducting first battery core V1 and second switch S1D, now, the electromotive force (V+ comprising the first battery core holds the V-of electromotive force and the first battery core to hold electromotive force) of what testing circuit detected is the first battery core V1, next battery core be strobed is: when count value is 2, gate gating second battery core V2, the i.e. first switch S 2S of conducting second battery core V2 and the second switch S2D of the second battery core V2, now, testing circuit detects the electromotive force of the second battery core V2, by that analogy, when count value is 7, the first switch S 5S of gate conducting the 5th battery core V5 and the second switch S5D of the 5th battery core, testing circuit detects the electromotive force of the 5th battery core V5, when count value is 8, testing circuit detects the electromotive force of the 4th battery core V4, when count value is 9, testing circuit detects the electromotive force of the 3rd battery core V3, when count value is 10, testing circuit detects the electromotive force of the second battery core V2.Now, within a count cycle, the first battery core V1, the 6th battery core V6 are strobed once, and after a period of time, such as at next cycle, the first battery core V1, the 6th battery core V6 will by gatings again; Second battery core V2, the 3rd battery core V3, the 4th battery core V4, the 5th battery core V5 have been strobed twice, illustrate in one-period, and the second battery core V2, the 3rd battery core V3, the 4th battery core V4, the 5th battery core V5 will by gatings again after a period of time; Above-mentioned two situations, achieving 6 battery cores all can by gating one by one; And the battery core be strobed after a period of time again by gating again.Now, the current battery core that is strobed and battery core that next is strobed and the current battery core that is strobed and current before relation between the battery core that is strobed all meet gating rule, the absolute value of the electrical potential difference namely between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold, wherein, the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is the positive electrode potential of the first battery core V1; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold, wherein, the current battery core be strobed positive pole and current before the absolute value of electrical potential difference between the positive pole of battery core that is strobed be the positive electrode potential of the first battery core V1.Now, first threshold is (n-3) * V, and n is the number of battery core in described battery protection chip, n >=4; V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum, and in the present embodiment, n is 6; the electromotive force of first threshold to be 3V, V the be positive pole of the first battery core V1.The voltage of the V+ end that testing circuit obtains as shown in fig. 4 a.
Or in one cycle, when count value is 1, the first switch S 6S of gate conducting the 6th battery core V6 and the second switch S6D of the 6th battery core V6, testing circuit detects the electromotive force of the 6th battery core V6, by that analogy, repeats no more herein.Now, the V+ terminal voltage of testing circuit acquisition as shown in Figure 4 b.
As shown in figures 4 a and 4b, time each battery core switches, be all the switching between adjacent battery core, testing circuit anode is the hopping amplitude of a battery core.This greatly reduces the time that testing circuit sets up stable operating point, shorten the minimum detection time of each battery core and improve accuracy of detection.
In another embodiment; for battery protection chip, there are 6 battery cores; counting rule is that number generator exports count value at Second Threshold scope Inner eycle; Second Threshold is 6, and namely number generator produces count value 1,2 a count cycle; 3 ... 6; next cycle produces again count value 1, and 2,3 ... 6.
When count value is 1,2,3,4,5,6, the battery core of gate gating is successively the first battery core V1, the 3rd battery core V3, the 5th battery core V5, the 6th battery core V6, the 4th battery core V4, the second battery core V2, even after namely first strange; Or the battery core of gate gating is successively the 6th battery core V6, the 4th battery core V4, the second battery core V2, the first battery core V1, the 3rd battery core V3, the 5th battery core V5, strange after namely first even.
Particularly, in one cycle, when current count value is 1, the first switch S 1S of gate conducting first battery core V1 and second switch S1D, now, the electromotive force of what testing circuit detected is the first battery core V1, next battery core be strobed is: when count value is 2, the first switch S 3S of gate conducting the 3rd battery core V3 and the second switch S3D of the 3rd battery core V3, now, testing circuit detects the electromotive force of the 3rd battery core V3, by that analogy, when count value is 3, testing circuit detects the electromotive force of the 5th battery core V5, when count value is 4, testing circuit detects the electromotive force of the 6th battery core V6, when count value is 5, testing circuit detects the electromotive force of the 4th battery core V4, when count value is 6, testing circuit detects the electromotive force of the second battery core V2.Now, in one-period, achieving 6 battery cores all can by gating one by one; And the battery core be strobed at next cycle again by gating again.Now, the current battery core that is strobed and battery core that next is strobed and the current battery core that is strobed and current before relation between the battery core that is strobed all meet gating rule, the absolute value of the electrical potential difference namely between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold, wherein, an absolute value part for electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is the positive electrode potential of the first battery core V1, and another part is the twice of the positive electrode potential of the first battery core V1; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold, wherein, the positive pole of the current battery core be strobed and current before the positive electrode potential of the absolute value of electrical potential difference between the positive pole of battery core that is strobed to be a part be the first battery core V1, another part is the twice of the positive electrode potential of the first battery core V1.Now, first threshold is (n-3) * V, and wherein, n is the number of battery core in described battery protection chip; n >=4, V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum, in the present embodiment; n is 6, the electromotive force of first threshold to be 3V, V the be positive pole of the first battery core V1.Now, the electromotive force that the V+ that testing circuit obtains holds as shown in Figure 5 a.
Or, namely in the period 1, when count value is 1, the first switch S 6S of gate gating the 6th battery core V6 and second switch S6D, now, the electromotive force of what testing circuit detected is the 6th battery core V6, when count value is 2, the first switch S 4S of gate gating the 4th battery core V4 and the second switch S4D of the 4th battery core V4, now, testing circuit detects the electromotive force of the 4th battery core V4, by that analogy, when count value is 3, testing circuit detects the electromotive force of the second battery core V2, when count value is 4, testing circuit detects the electromotive force of the first battery core V1, when count value is 5, testing circuit detects the electromotive force of the 3rd battery core V3, when count value is 6, testing circuit detects the electromotive force of the 5th battery core V5.Now, the electromotive force that the V+ that testing circuit obtains holds as shown in Figure 5 b.
As shown in figure 5a and 5b, time each battery core switches, testing circuit anode is the hopping amplitude of 2 battery core voltages to the maximum, and the first half in each cycle and latter half are odd even or even strange, such convenience takes different operations, such as, during equilibrium discharge respectively according to the odd even difference of series connection battery core, the first battery core V1, the 3rd battery core V3, the 5th battery core V5 can be allowed to allow electric discharge, and the second battery core V2, the 4th battery core V4, the 6th battery core V6 allow electric discharge simultaneously simultaneously.
In a further embodiment, for battery protection chip, there are 6 battery cores, can control battery protection chip by outside first signal SEL1 and outside secondary signal SEL2 is be operated in 3 economize on electricity cores, 4 economize on electricity cores, 5 economize on electricity cores, when 6 economize on electricity core series connection, such as, can " 0 " and " 1 " be respectively by outside first signal SEL1 and outside secondary signal SEL2 and produce four kinds of combinations, i.e. (SEL1, SEL2)=(0, 0), (0, 1), (1, 0), (1, 1), can with (0, 0) represent that battery protection chip is operated in the situation of 3 economize on electricity core series connection, with (0, 1) represent that battery protection chip is operated in the situation of 4 economize on electricity core series connection, with (1, 0) represent that battery protection chip is operated in the situation of 5 economize on electricity core series connection, with (1, 1) represent that battery protection chip is operated in the situation of 6 economize on electricity core series connection.Be operated in 3 economize on electricity cores at battery protection chip, 4 economize on electricity cores, during 5 economize on electricity core, only have part battery core to be strobed.During when battery protection chip is operated in this 4 kinds of battery core series connection, scan method is as follows:
(1) when battery protection chip is operated in the pattern of 3 economize on electricity core cascades; when namely only having part battery core to be strobed; counting rule is that number generator exports count value at Second Threshold scope Inner eycle; Second Threshold is 3, and namely number generator produces count value 1,2 a count cycle; 3; next cycle produces again count value 1, and 2,3.When count value is 1,2, when 3, the battery core of the corresponding gating of gate is the 3rd battery core V3, the first battery core V1, the second battery core V2.Namely in the period 1, when count value is 1, the first switch S 3S of gate gating the 3rd battery core V3 and the second switch S3D of the 3rd battery core V3, now, testing circuit detects the electromotive force of the 3rd battery core V3, and when count value is 2, testing circuit detects the electromotive force of the first battery core V1, when count value is 3, testing circuit detects the electromotive force of the second battery core V2.Now, within a count cycle, the part battery core in gating battery core, if do not change outside first signal SEL1 and secondary signal SEL2, these battery cores be strobed can be strobed again at next cycle.Now, the current battery core that is strobed and battery core that next is strobed and the current battery core that is strobed and current before relation between the battery core that is strobed all meet gating rule, the absolute value of the electrical potential difference namely between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold, wherein, the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is the positive electrode potential of the first battery core V1; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold, wherein, the current battery core be strobed positive pole and current before the absolute value of electrical potential difference between the positive pole of battery core that is strobed be the positive electrode potential of the first battery core V1.Now, first threshold is (n-3) * V, and n is the number of battery core in described battery protection chip; n >=4, V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum, in the present embodiment; n is 6, the electromotive force of first threshold to be 3V, V the be positive pole of the first battery core V1.Now, the electromotive force that the V+ that testing circuit obtains holds as shown in Figure 6 a.
(2) when battery protection chip is operated in the pattern of 4 economize on electricity core cascades; when namely only having part battery core to be strobed, counting rule is that number generator exports count value at Second Threshold scope Inner eycle, and Second Threshold is 4; namely number generator produces count value 1 a count cycle; 2,3,4; next cycle produces again count value 1; 2,3,4.When count value is 1,2,3,4, the battery core of the corresponding gating of gate is the 3rd battery core V3, the first battery core V1, the second battery core V2, the 4th battery core V4.Namely in the period 1, when count value is 1, the first switch S 3S of gate gating the 3rd battery core V3 and the second switch S3D of the 3rd battery core V3, now, testing circuit detects the electromotive force of the 3rd battery core V3, when count value is 2, testing circuit detects the electromotive force of the first battery core V1, and when count value is 3, testing circuit detects the electromotive force of the second battery core V2, when count value is 4, testing circuit detects the electromotive force of the 4th battery core V4.Now, within a count cycle, just part battery core battery core is strobed, if do not change outside first signal SEL1 and secondary signal SEL2, these battery cores be strobed can be strobed again at next cycle.Now, the current battery core that is strobed and battery core that next is strobed and the current battery core that is strobed and current before relation between the battery core that is strobed all meet gating rule, the absolute value of the electrical potential difference namely between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold, wherein, the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is the positive electrode potential of the first battery core V1; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold, wherein, the current battery core be strobed positive pole and current before the absolute value of electrical potential difference between the positive pole of battery core that is strobed be the positive electrode potential of the first battery core V1.Now, first threshold is (n-3) * V, and n is the number of battery core in described battery protection chip; n >=4, V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum, in the present embodiment; n is 6, the electromotive force of first threshold to be 3V, V the be positive pole of the first battery core V1.Now, the V+ terminal voltage of testing circuit acquisition as shown in Figure 6 b.
(3), when battery protection chip is operated in the pattern of 5 economize on electricity core cascades, when namely only having part battery core to be strobed, counting rule is that number generator exports count value at Second Threshold scope Inner eycle; Second Threshold is 5, and namely number generator produces count value 1,2 a count cycle; 3; 4,5, next cycle produces again count value 1; 2; 3,4,5.When count value is 1,2,3,4,5, the battery core of the corresponding gating of gate is the 3rd battery core V3, the first battery core V1, the second battery core V2, the 4th battery core V4, the 5th battery core V5.Namely in the period 1, when count value is 1, the first switch S 3S of gate conducting the 3rd battery core V3 and the second switch S3D of the 3rd battery core V3, now, testing circuit detects the electromotive force of the 3rd battery core V3, when count value is 2, testing circuit detects the electromotive force of the first battery core V1, when count value is 3, testing circuit detects the electromotive force of the second battery core V2, and when count value is 4, testing circuit detects the electromotive force of the 4th battery core V4, when count value is 5, testing circuit detects the electromotive force of the 5th battery core V5.Now, within a count cycle, the part battery core just in gating battery core, if do not change outside first signal SEL1 and secondary signal SEL2, these battery cores be strobed can be strobed again at next cycle.Now, within several cycle, the current battery core that is strobed and battery core that next is strobed and the current battery core that is strobed and current before relation between the battery core that is strobed all meet gating rule, the absolute value of the electrical potential difference namely between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold, wherein, the absorption part of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is the positive electrode potential of the first battery core V1, and another part is 2 times of the positive electrode potential of the first battery core V1; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold, wherein, the absorption part of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is the positive electrode potential of the first battery core V1, and another part is 2 times of the positive electrode potential of the first battery core V1.Now, first threshold is (n-3) * V, and wherein, n is the number of battery core in described battery protection chip; n >=4, V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum, in the present embodiment; n is 6, the electromotive force of first threshold to be 3V, V the be positive pole of the first battery core V1.Now, the voltage held to the V+ of the 5th battery core V5 of the V+ end of the first battery core V1 that obtains of testing circuit as fig. 6 c.
(4) when battery protection chip is operated in the pattern of 6 economize on electricity core cascades; whole battery core is strobed; counting rule is that number generator exports count value at Second Threshold scope Inner eycle; Second Threshold is 6, and namely number generator produces count value 1,2 a count cycle; 3 ... 6; next cycle produces again count value 1, and 2,3 ... 6.When count value is 1,2,3,4,5,6, the battery core of the corresponding gating of gate is the 3rd battery core V3, the first battery core V1, the second battery core V2, the 4th battery core V4, the 5th battery core V5, the 6th battery core V6.Namely in the period 1, when count value is 1, the first switch S 3S of gate gating the 3rd battery core V3 and the second switch S3D of the 3rd battery core V3, now, testing circuit detects the electromotive force of the 3rd battery core V3, when count value is 2, testing circuit detects the electromotive force of the first battery core V1, when count value is 3, testing circuit detects the electromotive force of the second battery core V2, when count value is 4, testing circuit detects the electromotive force of the 4th battery core V4, when count value is 5, testing circuit detects the electromotive force of the 5th battery core V5, when count value is 6, testing circuit detects the electromotive force of the 6th battery core V6.Now, within a count cycle, whole battery core is strobed one by one, if do not change outside first signal SEL1 and secondary signal SEL2, these battery cores be strobed can be strobed again at next cycle.Now, within some cycles, the current battery core that is strobed and battery core that next is strobed and the current battery core that is strobed and current before relation between the battery core that is strobed all meet gating rule, the absolute value of the electrical potential difference namely between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold, wherein, the absorption part of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is the positive electrode potential of the first battery core V1, part is 2 times of the positive electrode potential of the first battery core V1, other parts are 3 times of the positive electrode potential of the first battery core V1, the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold, wherein, the absorption part of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is the positive electrode potential of the first battery core V1, part is 2 times of the positive electrode potential of the first battery core V1, and other parts are 3 times of the positive electrode potential of the first battery core V1.Now, first threshold is (n-3) * V, and wherein, n is the number of battery core in described battery protection chip; n >=4, V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum, in the present embodiment; n is 6, the electromotive force of first threshold to be 3V, V the be positive pole of the first battery core V1.Now, the electromotive force that the V+ that testing circuit obtains holds as shown in fig 6d.
As shown in figures 6 a-6d; when outside first signal SEL1 and outside secondary signal SEL2 control battery protection chip is operated in the battery core of different joint number; scan efficiency changes with outside first signal SEL1 and outside secondary signal SEL2 signal, and testing circuit anode is the hopping amplitude of three battery cores to the maximum.
Be understandable that, above-described embodiment is only 6 for the number of battery core in battery protection chip, and when battery core number is not 6, also can take the method for above-mentioned S210 to carry out, in battery protection chip of the present invention, the number of battery core is at least 4.
S220, testing circuit detects the voltage of the current described battery core be strobed successively.
Particularly, testing circuit detects the voltage of the battery core of gating.As shown in Figure 3, testing circuit obtains the electromotive force of positive pole of battery core and the electromotive force of the negative pole of battery core, by the electromotive force of positive pole and the electromotive force of negative pole poor, obtain the electromotive force of battery core, i.e. voltage.
It should be noted that, in figs. 1-6, the electromotive force of the positive pole of the first battery core V1 is represented with V1, the electromotive force of the positive pole of the second battery core V2 is represented with V2 ... the electromotive force of the 6th battery core V6 positive pole is represented with V6.
Be understandable that, when the present invention takes the mode of software to realize, processor and memory is also comprised in this battery protection chip, battery core in battery protection chip and the corresponding relation between count value can be generated multiple mapping tables, such as, the relation of the count value in kind of the situation of 3 in S210 and battery core can be generated mapping table, count value can be comprised in this mapping table, the label of battery core and the label of switch, and multiple mapping tables described are placed in memory, when count value is a value, processor gets this count value, and call corresponding mapping table, with the corresponding battery core of gating, realize the measurement of the voltage of the battery core of gating.
The battery core scan method of the battery protection chip adopting the embodiment of the present invention to provide; decrease the voltage jump amplitude of testing circuit positive and negative terminal; thus reduce the time that testing circuit sets up stable operating point; improve accuracy of detection; sweep speed can be improved simultaneously; by the change to sweep speed, further facilitate the scan efficiency of battery protection chip when battery equilibrium electric discharge or outside selection signal change.
Professional should recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a battery core scanning circuit for battery protection chip, is characterized in that, described circuit comprises:
Multiple battery cores of series connection;
Gate, presets the corresponding battery core of gating rule gating for basis; Described default gating rule comprises: the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold; Some or all battery core all can by gating one by one; The selected battery core passed through is will by gating again after a period of time;
Testing circuit, for detecting the voltage of the current described battery core be strobed.
2. circuit according to claim 1, is characterized in that, described gate comprises number generator and gating unit;
Described number generator, for exporting count value according to presetting counting rule, one in multiple battery cores of each count value correspondence series connection;
Gating unit, the battery core that this count value of count value gating for exporting according to described number generator is corresponding.
3. circuit according to claim 1, is characterized in that, described first threshold is specially: (n-3) * V, and wherein, n is the number of battery core in described battery protection chip, n >=4, and V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum.
4. circuit according to claim 1, it is characterized in that, described circuit also comprises: the electric capacity equal with described battery core quantity, the resistance equal with described battery core quantity, the switch of described battery core quantity 2 times, corresponding first switch of battery core described in each and second switch;
One end of first switch of each battery core in described battery core is connected to the negative pole of described each battery core, the other end of the first switch of described each battery core is connected to the first test side of described testing circuit, the second switch of described each battery core is connected to the positive pole of this battery core after the resistance of this battery core, the other end of the second switch of described each battery core is connected to the second test side of described testing circuit, and the Capacitance parallel connection of described each battery core is between first switch and the second switch of the first battery core of this battery core.
5. circuit according to claim 4, is characterized in that, described circuit also comprises:
Described gate when determining a gating battery core, then controls the first switch corresponding to this battery core and second switch conducting simultaneously;
Described gate determine not a gating battery core time, then control the first switch corresponding to this battery core and second switch ends simultaneously.
6. circuit according to claim 1, is characterized in that, described default gating rule is specially,
According to multiple battery cores of the order of connecting successively gating series connection;
After the battery core with the highest positive electrode potential is strobed, the battery core with time high positive electrode potential be adjacent is strobed;
After the battery core with minimum positive electrode potential is strobed, the battery core with time low positive electrode potential be adjacent is strobed.
7. a battery core scan method for battery protection chip, be applied to the battery core scanning circuit of battery protection chip, it is characterized in that, described method comprises:
Gate is according to the corresponding battery core of default gating rule gating; Described default gating rule comprises: the absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of battery core that next is strobed is not more than first threshold; The absolute value of the electrical potential difference between the positive pole of the current battery core be strobed and the positive pole of the current battery core be strobed before is not more than first threshold; Some or all battery core all can by gating one by one; The selected battery core passed through is will by gating again after a period of time;
Testing circuit detects the voltage of the current described battery core be strobed.
8. method according to claim 7, is characterized in that, described gate comprises number generator and gating unit;
Described number generator exports count value according to default counting rule, one in multiple battery cores of each count value correspondence series connection;
The battery core that gating unit is corresponding according to this count value of count value gating that described number generator exports.
9. circuit according to claim 7, is characterized in that, described first threshold is specially: (n-3) * V, and wherein, n is the number of battery core in described battery protection chip, n >=4, and V is the positive electrode potential of the battery core that in described battery core, positive electrode potential is minimum.
10. circuit according to claim 7, is characterized in that, described default gating rule is specially,
According to multiple battery cores of the order of connecting successively gating series connection;
After the battery core with the highest positive electrode potential is strobed, the battery core with time high positive electrode potential be adjacent is strobed;
After the battery core with minimum positive electrode potential is strobed, the battery core with time low positive electrode potential be adjacent is strobed.
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| CN101865945A (en) * | 2010-06-11 | 2010-10-20 | 李小平 | Mechanical scanning type method and device for detecting voltage of serial battery |
| CN102162834A (en) * | 2010-12-14 | 2011-08-24 | 宁波飞驰达电子科技发展有限公司 | Battery voltage detecting device in serially-connected battery pack and method of battery voltage detecting device |
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