CN219067895U - Charge equalization circuit and battery - Google Patents

Abstract

The application relates to a charge equalization circuit and a battery, wherein the circuit is connected with signal adjusting units in a one-to-one correspondence manner based on each battery cell connecting interface, and each signal adjusting unit is connected with a battery cell detection end in a one-to-one correspondence manner; the first end of each equalization unit is connected with each cell detection end in one-to-one correspondence, the second end of each equalization unit is connected with each cell connection interface in one-to-one correspondence, and the third end of each equalization unit is connected with the cell connection interface of the corresponding upper-stage cell to be charged, so that the multi-stage cell to be charged contained in the battery can be conveniently and uniformly charged. According to the battery cell equalizing circuit, the battery cell protecting circuit and the equalizing circuit are arranged, a special equalizing charger is not needed, the battery cells which are contained in the battery cells are equalized to charge, the charging equalizing circuit is simplified, the number of adopted charging equalizing circuit components is small, the overall weight of a hardware circuit is reduced, the circuit cost is reduced, and the circuit size is small.

Description

Charge equalization circuit and battery

Technical Field

The present disclosure relates to battery management, and more particularly to a charge equalization circuit and a battery.

Background

With the development of battery technology, the application field of batteries is becoming wider and wider, and batteries are divided into single-cell batteries and multi-cell battery packs, and in the manufacturing of the multi-cell battery packs, a plurality of cells are required to be connected in series to form the battery packs, and then the battery packs are put into application. At present, in the charging process of a traditional battery pack, the condition that a certain group of battery cells in the battery pack are charged too fast easily exists, namely the charging speed is unbalanced, so that some battery cells in the battery pack can be overcharged, and some battery cells are in an unfilled state, so that the service life of the battery is shortened, and the safety of the battery is reduced.

In the existing battery pack charge equalization mode, if a charger with a charge equalization function is adopted for charging, a special charger is required to be equipped, so that the battery pack charge equalization method is inconvenient to use; and a complex charge equalization circuit formed by devices such as a transformer is also adopted, so that the circuit structure is complex, the cost is high, and the occupied space is large.

Disclosure of Invention

In view of the above, it is necessary to provide a charge equalization circuit and a battery capable of facilitating charge equalization of a battery, simplifying a charge equalization circuit, reducing circuit cost, and having a small circuit size, in order to solve the problems of the conventional charge equalization system for a battery.

In a first aspect, the present application provides a charge equalization circuit, comprising:

the battery cell protection circuit comprises at least a battery cell protection chip, 2 battery cell connection interfaces and at least 2 signal adjusting units; the cell protection chip comprises at least 2 cell detection ends; each cell connecting interface is used for being connected with the multilevel to-be-charged cells which are sequentially connected in series in a one-to-one correspondence manner, each cell connecting interface is connected with each signal adjusting unit in a one-to-one correspondence manner, and each signal adjusting unit is connected with the cell detection end in a one-to-one correspondence manner;

an equalizing circuit comprising at least 2 equalizing units; the first end of each equalization unit is connected with each cell detection end in one-to-one correspondence, the second end of each equalization unit is connected with each cell connection interface in one-to-one correspondence, and the third end of each equalization unit is connected with the cell connection interface of the corresponding upper-stage cell to be charged.

Optionally, the signal conditioning unit includes a first resistor and a first capacitor;

the first end of the first resistor is connected with the corresponding battery cell connecting interface, and the second end of the first resistor is connected with the corresponding battery cell detecting end;

the first end of the first capacitor is connected with the second end of the corresponding first resistor, and the second end of the first capacitor is connected with the ground wire.

Optionally, the equalizing unit includes a first switching tube, a second resistor and a third resistor;

the grid electrode of the first switch tube is connected with the first end of the second resistor, and the second end of the second resistor is connected with the corresponding cell detection end; the source electrode of the first switch tube is connected with the corresponding cell detection end; the drain electrode of the first switching tube is connected with the first end of the third resistor, and the second end of the third resistor is connected with the battery cell connecting interface of the battery cell to be charged corresponding to the previous stage.

Optionally, the battery core protection circuit further comprises a current sampling circuit and a battery cathode connection interface; the cell protection chip also comprises a current sampling input end;

the current sampling circuit is connected between the battery cathode connection interface and the current sampling input end.

Optionally, the current sampling circuit includes a second capacitor, a fourth resistor and a fifth resistor;

the first end of the second capacitor is connected with the current sampling input end, and the second end of the second capacitor is connected with the ground wire; the first end of the fourth resistor is connected with the current sampling input end, the second end of the fourth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is respectively connected with the ground wire and the battery negative electrode connection interface.

Optionally, the cell protection chip further comprises a discharge output end and a battery output negative electrode detection end; the battery core protection circuit also comprises a second switch tube, a sixth resistor and a seventh resistor;

the first end of the sixth resistor is connected with the discharge output end, the second end of the sixth resistor is connected with the grid electrode of the second switching tube, the source electrode of the second switching tube is connected with the first end of the fifth resistor, the drain electrode of the second switching tube is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with the battery output negative electrode detection end.

Optionally, the cell protection chip further comprises a charging output end; the battery core protection circuit also comprises a charging control circuit and a discharging negative electrode connection interface;

the charging control circuit is respectively connected with the charging output end, the discharging negative electrode connection interface and the drain electrode of the second switching tube.

Optionally, the charging control circuit further includes a third switching tube, a fourth switching tube, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a first diode; the battery core protection circuit also comprises a battery anode connection interface;

the first end of the eighth resistor is connected with the charging output end; the second end of the eighth resistor is respectively connected with the first end of the ninth resistor and the grid electrode of the third switching tube; the second end of the ninth resistor is connected with a battery anode connection interface; the source electrode of the third switch tube is connected with the battery anode connecting interface; the drain electrode of the third switching tube is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the positive electrode of the first diode, and the negative electrode of the first diode is respectively connected with the first end of the eleventh resistor and the grid electrode of the fourth switching tube; the second end of the eleventh resistor is connected with the source electrode of the fourth switching tube, the drain electrode of the fourth switching tube is connected with the drain electrode of the second switching tube, and the source electrode of the fourth switching tube is connected with the discharge cathode connection interface.

Optionally, the cell protection chip further comprises a low temperature detection end and an over temperature detection end; the battery core protection circuit also comprises a twelfth resistor, a thirteenth resistor and a thermistor;

the first end of the twelfth resistor is connected with the low-temperature detection end, and the second end of the twelfth resistor is connected with the first end of the thermistor; the first end of the thirteenth resistor is connected with the over-temperature detection end, the second end of the thirteenth resistor is connected with the first end of the thermistor, and the second end of the thermistor is connected with the ground wire.

In a second aspect, the present application provides a battery, the battery including a plurality of stages of battery cells to be charged and a charge equalization circuit according to any one of the above in series in sequence;

the charge equalization circuit is connected with the multi-stage battery core to be charged.

One of the above technical solutions has the following advantages and beneficial effects:

in the charge equalization circuit, the battery core protection circuit comprises a battery core protection chip, at least 2 battery core connection interfaces and at least 2 signal adjustment units; the equalization circuit comprises at least 2 equalization units; the cell protection chip comprises at least 2 cell detection ends; each cell connection interface is connected with the multilevel to-be-charged cells which are sequentially connected in series in a one-to-one correspondence manner, each cell connection interface is connected with each signal adjusting unit in a one-to-one correspondence manner, and each signal adjusting unit is connected with the cell detection end in a one-to-one correspondence manner; the first end of each equalization unit is connected with each cell detection end in one-to-one correspondence, the second end of each equalization unit is connected with each cell connection interface in one-to-one correspondence, and the third end of each equalization unit is connected with the cell connection interface of the corresponding upper-stage cell to be charged, so that the multi-stage cell to be charged contained in the battery can be conveniently and uniformly charged. According to the battery cell equalizing circuit, the battery cell protecting circuit and the equalizing circuit are arranged, a special equalizing charger is not needed, the battery cells which are contained in the battery cells are equalized to charge, the charging equalizing circuit is simplified, the number of adopted charging equalizing circuit components is small, the overall weight of a hardware circuit is reduced, the circuit cost is reduced, and the circuit size is small.

Drawings

Fig. 1 is a schematic diagram of a first structure of a charge equalization circuit in an embodiment of the present application;

fig. 2 is a schematic diagram of a second structure of a charge equalization circuit in an embodiment of the present application;

fig. 3 is a schematic diagram of a third structure of the charge equalization circuit in the embodiment of the present application;

fig. 4 is a fourth schematic structural diagram of a charge equalization circuit according to an embodiment of the present application;

fig. 5 is a schematic diagram of a fifth configuration of a charge equalization circuit according to an embodiment of the present application.

Reference numerals:

10. a cell protection circuit; 100. a cell connection interface; 110. a battery cell protection chip; 120. a signal adjusting unit; 122. a first resistor; 124. a first capacitor; 130. a battery cathode connection interface; 140. a current sampling circuit; 142. a second capacitor; 144. a fourth resistor; 146. a fifth resistor; 152. a second switching tube; 154. a sixth resistor; 156. a seventh resistor; 160. a charge control circuit; 162. a third switching tube; 164. a fourth switching tube; 166. an eighth resistor; 168. a ninth resistor; 172. a tenth resistor; 174. an eleventh resistor; 176. a first diode; 180. a discharge negative electrode connection interface; 192. a twelfth resistor; 194. a thirteenth resistor; 196 thermistor; 20. an equalizing circuit; 200. an equalizing unit; 202. a first switching tube; 204. a second resistor; 206. and a third resistor.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In addition, the term "plurality" shall mean two as well as more than two.

In one embodiment, as shown in fig. 1, a charge equalization circuit is provided that includes a cell protection circuit and an equalization circuit 20. The cell protection circuit comprises a cell protection chip 110, at least 2 cell connection interfaces 100 and at least 2 signal adjustment units 120; the cell protection chip 110 includes at least 2 cell detection terminals; each cell connection interface 100 is used for being connected with the multilevel to-be-charged cells which are sequentially connected in series in a one-to-one correspondence manner, each cell connection interface 100 is connected with each signal adjustment unit 120 in a one-to-one correspondence manner, and each signal adjustment unit 120 is connected with the cell detection end in a one-to-one correspondence manner; the equalization circuit 20 includes at least 2 equalization units 200; the first end of each equalization unit 200 is connected with each cell detection end in a one-to-one correspondence, the second end of each equalization unit 200 is connected with each cell connection interface 100 in a one-to-one correspondence, and the third end of each equalization unit 200 is connected with the cell connection interface 100 corresponding to the cell to be charged of the previous stage.

The battery core protection circuit can be used for performing charge and discharge protection on the battery core of the battery. The battery may include multiple stages of cells to be charged in series, for example, 6 cells to be charged are connected in series in sequence to form a battery. The positive electrode of the current-stage battery cell to be charged is connected with the negative electrode of the previous-stage battery cell to be charged, and the negative electrode of the current-stage battery cell to be charged is connected with the positive electrode of the next-stage battery cell to be charged, so that the multi-stage battery cells to be charged which are sequentially connected in series are formed.

The cell protection circuit may include at least 2 cell connection interfaces 100, a cell protection chip 110, and at least 2 signal conditioning units 120. The battery cell connection interfaces 100 are used for plugging corresponding battery cells to be charged, for example, the number of the battery cell connection interfaces 100 is 6, and the 6 battery cells to be charged can be plugged in the 6 battery cell connection interfaces 100 in a one-to-one correspondence manner. It should be noted that, the number of the battery cells to be charged is less than or equal to the number of the battery cell connection interfaces 100. The cell protection chip 110 may be used for performing charge and discharge protection on a cell included in a battery, where the cell protection chip 110 includes at least 2 cell detection terminals. It should be noted that, the number of the battery cell detection terminals is the same as the number of the battery cell connection interfaces 100, for example, the number of the battery cell detection terminals is 6, and the number of the battery cell connection interfaces 100 is 6, so that the 6 battery cell connection interfaces 100 are in one-to-one correspondence with the 6 battery cell detection terminals.

The signal conditioning unit 120 may be used to perform conditioning processing on the electrical signal. It should be noted that, the number of signal conditioning units 120 is the same as the number of the battery cell connection interfaces 100, for example, the number of signal conditioning units 120 is 6, and the number of the battery cell connection interfaces 100 is 6, and then the 6 signal conditioning units 120 correspond to the 6 battery cell connection interfaces 100 one by one. The equalization circuit 20 may include at least 2 equalization units 200. The equalization unit 200 may be configured to perform charge equalization adjustment on the connected battery cells to be charged. It should be noted that, the number of the equalization units 200 is the same as the number of the battery cell connection interfaces 100, for example, the number of the equalization units 200 is 6, and the number of the battery cell connection interfaces 100 is 6, and then the 6 equalization units 200 are in one-to-one correspondence with the 6 battery cell conversion connection interfaces 100.

In the above embodiment, based on the fact that each cell connection interface 100 is connected with the multi-stage to-be-charged cells connected in series in sequence in a one-to-one correspondence manner, each cell connection interface 100 is connected with each signal adjustment unit 120 in a one-to-one correspondence manner, and each signal adjustment unit 120 is connected with the cell detection end in a one-to-one correspondence manner; the first end of each equalization unit 200 is connected with each cell detection end in a one-to-one correspondence manner, the second end of each equalization unit 200 is connected with each cell connection interface 100 in a one-to-one correspondence manner, and the third end of each equalization unit 200 is connected with the cell connection interface 100 corresponding to the cell to be charged of the previous stage, so that convenient equalization charging of the multistage cell to be charged contained in the battery can be realized. According to the battery cell equalizing circuit, the battery cell protecting circuit and the equalizing circuit 20 are arranged, a special equalizing charger is not needed, the battery cells which are contained in the battery cells are equalized to charge, the charge equalizing circuit 20 is simplified, the number of components of the charge equalizing circuit 20 is small, the overall weight of a hardware circuit is reduced, the circuit cost is reduced, and the circuit size is small.

In one example, as shown in fig. 2, the signal conditioning unit 120 includes a first resistor 122 and a first capacitor 124. A first end of the first resistor 122 is connected with the corresponding battery cell connection interface 100, and a second end of the first resistor 122 is connected with the corresponding battery cell detection end; the first end of the first capacitor 124 is connected to the second end of the corresponding first resistor 122, and the second end of the first capacitor 124 is connected to the ground line.

The resistance of the first resistor 122 and the capacitance of the first capacitor 124 can be set according to specific circuit design requirements. The first resistor 122 may be a chip resistor and the first capacitor 124 may be a chip capacitor. Based on the fact that the first resistor 122 is connected between the corresponding cell connection interface 100 and the corresponding cell detection end, the first capacitor 124 is connected between the second end residual ground wire of the first resistor 122, and then in the charging process, current limiting and filtering adjustment processing are conducted on the electric signals output by the cell detection end through the current limiting of the first resistor 122 and the filtering action of the first capacitor 124, and reliability of signal detection can be further provided.

In one example, as shown in fig. 3, the equalization unit 200 includes a first switching tube 202, a second resistor 204, and a third resistor 206; the grid electrode of the first switch tube 202 is connected with the first end of the second resistor 204, and the second end of the second resistor 204 is connected with the corresponding battery cell detection end; the source electrode of the first switch tube 202 is connected with a corresponding battery cell detection end; the drain electrode of the first switch tube 202 is connected to the first end of the third resistor 206, and the second end of the third resistor 206 is connected to the battery cell connection interface 100 corresponding to the battery cell to be charged in the previous stage.

The first switch tube 202 may be an N-type MOS tube. The second resistor 204 and the third resistor 206 may be, but are not limited to, alloy resistors of the package 2512. The resistance values of the second resistor 204 and the third resistor 206 can be set according to specific circuit design requirements.

Illustratively, based on the gate of the first switch tube 202 being connected to the first end of the second resistor 204, the source of the first switch tube 202 is connected to the corresponding cell detection end, and the drain of the first switch tube 202 is connected to the first end of the third resistor 206; a second end of the second resistor 204 is connected with a corresponding battery cell detection end, and a second end of the third resistor 206 is connected with the battery cell connection interface 100 corresponding to the battery cell to be charged at the previous stage; through connecting the corresponding electric core connection interface 100, the electric core detection end of the electric core protection chip 110 to the equalization unit 200, the first switch tube 202 can be controlled to be on-off according to the collected electric signals of the electric core to be charged, and the electric core to be charged is further subjected to equalization charge control, so that the battery can be equalized to charge without a special equalization charger, the number of components of the equalization unit 200 is small, the weight of a circuit structure is reduced, and meanwhile, the charge equalization circuit 20 is simplified.

It should be noted that the balanced starting voltage and the balanced current can be designed differently according to the requirements of different batteries.

In one example, as shown in fig. 4, the cell protection circuit further includes a current sampling circuit 140 and a battery cathode connection interface 130; the cell protection chip 110 further includes a current sampling input terminal; the current sampling circuit 140 is connected between the battery cathode connection interface 130 and the current sampling input terminal.

The current sampling circuit 140 may be used to sample the current at the negative terminal of the battery. The battery negative electrode connection interface 130 may be used to connect the negative electrode of the battery, and the battery is composed of 6 cells to be charged sequentially connected in series, and the negative electrode of the last 1 cells to be charged is the negative electrode of the battery.

Illustratively, as shown in FIG. 4, the current sampling circuit 140 includes a second capacitor 142, a fourth resistor 144, and a fifth resistor 146; a first end of the second capacitor 142 is connected with the current sampling input end, and a second end of the second capacitor 142 is connected with the ground wire; the first end of the fourth resistor 144 is connected to the current sampling input end, the second end of the fourth resistor 144 is connected to the first end of the fifth resistor 146, and the second end of the fifth resistor 146 is connected to the ground wire and the battery negative electrode connection interface 130, respectively. The second capacitor 142, the fourth resistor 144, and the fifth resistor 146 may be configured according to specific circuit design requirements. The fourth resistor 144 and the fifth resistor 146 are current detection resistors, and the second capacitor 142 may be a patch capacitor.

The cell protection chip 110 further includes a current sampling input end (i.e. a CS end), where the current sampling input end may be used to obtain a current sampling signal transmitted by the current sampling circuit 140, and the cell protection chip 110 may perform corresponding charging wave protection control according to the current sampling signal.

In one example, as shown in fig. 4, the cell protection chip 110 further includes a discharge output terminal and a battery output negative electrode detection terminal; the cell protection circuit further comprises a second switch tube 152, a sixth resistor 154 and a seventh resistor 156; the first end of the sixth resistor 154 is connected to the discharge output end, the second end of the sixth resistor 154 is connected to the gate of the second switch tube 152, the source of the second switch tube 152 is connected to the first end of the fifth resistor 146, the drain of the second switch tube 152 is connected to the second end of the seventh resistor 156, and the first end of the seventh resistor 156 is connected to the battery output negative electrode detection end.

The cell protection chip 110 further includes a discharge output terminal (DO terminal) and a battery output negative electrode detection terminal (VM terminal). The second switching tube 152 is a discharge MOS tube, and the second switching tube 152 is an N-type MOS tube. The sixth resistor 154 and the seventh resistor 156 are current limiting resistors, and the resistance values of the sixth resistor 154 and the seventh resistor 156 can be set according to specific circuit design requirements.

The battery output negative detection terminal of the cell protection chip 110 can be used to detect the negative output state of the battery. The discharging output end can be used for controlling the discharging of the battery cell to be charged. Based on the output signal of the discharging output end of the battery cell protection chip 110, the on-off of the second switch tube 152 is controlled, so that the discharging control of the battery cell to be charged contained in the battery is realized.

In one example, as shown in fig. 4, the cell protection chip 110 further includes a charging output; the cell protection circuit further comprises a charging control circuit 160 and a discharging negative electrode connection interface 180; the charge control circuit 160 is connected to the charge output terminal, the discharge cathode connection interface 180, and the drain of the second switching tube 152, respectively.

The charging output end (CO end) can be used for controlling the charging of the battery cell to be charged. Based on the output signal of the charging output end of the battery cell protection chip 110, the working state of the charging control circuit 160 is controlled, so as to realize the charging control of the battery cell to be charged.

Illustratively, as shown in fig. 4, the charge control circuit 160 further includes a third switching tube 162, a fourth switching tube 164, an eighth resistor 166, a ninth resistor 168, a tenth resistor 172, an eleventh resistor 174, and a first diode 176; the battery core protection circuit also comprises a battery anode connection interface. A first end of the eighth resistor 166 is connected to the charging output end; the second end of the eighth resistor 166 is connected to the first end of the ninth resistor 168 and the gate of the third switching tube 162, respectively; a second end of the ninth resistor 168 is connected with a battery anode connection interface; the source electrode of the third switch tube 162 is connected with the battery anode connection interface; the drain electrode of the third switch tube 162 is connected with the first end of the tenth resistor 172, the second end of the tenth resistor 172 is connected with the positive electrode of the first diode 176, and the negative electrode of the first diode 176 is respectively connected with the first end of the eleventh resistor 174 and the grid electrode of the fourth switch tube 164; a second terminal of the eleventh resistor 174 is connected to the source of the fourth switching tube 164, the drain of the fourth switching tube 164 is connected to the drain of the second switching tube 152, and the source of the fourth switching tube 164 is connected to the discharge cathode connection interface 180.

Based on the output signals of the charging output end of the battery cell protection chip 110, the channels of the third switch tube 162 and the fourth switch tube 164 of the charging control circuit 160 are controlled, so that the charging control of the battery cell to be charged contained in the battery is realized, the overcharging of the battery cell to be charged is prevented, and the overcharge protection effect is started.

In one example, as shown in fig. 4, the cell protection chip further includes a low temperature detection end and an over temperature detection end; the cell protection circuit further includes a twelfth resistor 192, a thirteenth resistor 194, and a thermistor 196. A first end of the twelfth resistor 192 is connected to the low temperature detection end, and a second end of the twelfth resistor 192 is connected to the first end of the thermistor 196; the first end of the thirteenth resistor 194 is connected to the over-temperature detection end, the second end of the thirteenth resistor 194 is connected to the first end of the thermistor 196, and the second end of the thermistor 196 is connected to the ground.

The resistance values of the twelfth resistor 192 and the thirteenth resistor 194 may be set according to specific circuit design requirements.

The low temperature detection end (RUT) of the battery core protection chip can be used for detecting the temperature of the circuit and judging whether to start the low temperature protection function according to the temperature. The over-temperature detection end (ROT) of the battery core protection chip can be used for detecting the temperature of the circuit and judging whether to start the over-temperature protection function according to the temperature.

In one example, as shown in fig. 5, a charge equalization circuit is provided, wherein the cell protection chip U1 may be a CW1073 model protection chip. The battery cell protection chip U1 comprises a first battery cell detection end VC1, a second battery cell detection end VC2, a third battery cell detection end VC3, a fourth battery cell detection end VC4, a fifth battery cell detection end VC5 and a sixth battery cell detection end VC6. The battery cell protection chip further comprises a battery anode detection end VC7 and a battery cathode detection CV0. The battery core protection circuit comprises a first battery core connection interface B1, a second battery core connection interface B2, a third battery core connection interface B3, a fourth battery core connection interface B4, a fifth battery core connection interface B5 and a sixth battery core connection interface B6. The battery core protection circuit also comprises a battery anode connection interface B+ and a battery cathode connection interface B-. The cell protection circuit further comprises 8 signal adjustment units, each signal adjustment unit comprises a first resistor (R1 to R8) and a first capacitor (C1 to C8); the equalization circuit includes 7 equalization circuits, each equalization unit including a first switching tube (Q1 to Q7), a second resistor (R9 to R15), and a third resistor (R16 to R22).

Based on the fact that each cell connecting interface is connected with the multilevel to-be-charged cells which are sequentially connected in series in a one-to-one correspondence manner, each cell connecting interface is connected with each signal adjusting unit in a one-to-one correspondence manner, and each signal adjusting unit is connected with the cell detection end in a one-to-one correspondence manner; the first end of each equalization unit is connected with each cell detection end in one-to-one correspondence, the second end of each equalization unit is connected with each cell connection interface in one-to-one correspondence, and the third end of each equalization unit is connected with the cell connection interface of the corresponding upper-stage cell to be charged, so that the multi-stage cell to be charged contained in the battery can be conveniently and uniformly charged. Through setting up electric core protection circuit and equalizer circuit, need not special balanced charger, can realize carrying out equalizing charge to the multistage electric core that waits to charge that the battery contains, simplified the equalizer circuit that charges, the equalizer circuit components and parts quantity of charging that adopts is few, has alleviateed hardware circuit's whole weight, reduces circuit cost, and the circuit is small.

In one embodiment, a battery is further provided, the battery comprises a plurality of stages of battery cores to be charged and a charge equalization circuit of any one of the above-mentioned battery cores; the charge equalization circuit is connected with the multi-stage battery core to be charged.

Wherein the battery may be, but is not limited to, a communication battery.

Specifically, the charge equalization circuit comprises at least 2 cell connection interfaces, a cell protection chip and at least 2 signal regulating units; the equalization circuit comprises at least 2 equalization units; the cell protection chip comprises at least 2 cell detection ends; based on the fact that each cell connecting interface is connected with the multilevel to-be-charged cells which are sequentially connected in series in a one-to-one correspondence manner, each cell connecting interface is connected with each signal adjusting unit in a one-to-one correspondence manner, and each signal adjusting unit is connected with the cell detection end in a one-to-one correspondence manner; the first end of each equalization unit is connected with each cell detection end in one-to-one correspondence, the second end of each equalization unit is connected with each cell connection interface in one-to-one correspondence, and the third end of each equalization unit is connected with the cell connection interface of the corresponding upper-stage cell to be charged, so that the multi-stage cell to be charged contained in the battery can be conveniently and uniformly charged. According to the battery cell equalizing circuit, the battery cell protecting circuit and the equalizing circuit are arranged, a special equalizing charger is not needed, the battery cells which are contained in the battery cells are equalized to charge, the charging equalizing circuit is simplified, the number of adopted charging equalizing circuit components is small, the overall weight of a hardware circuit is reduced, the circuit cost is reduced, and the circuit size is small.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A charge equalization circuit, comprising:

the battery cell protection circuit comprises a battery cell protection chip, at least 2 battery cell connection interfaces and at least 2 signal adjusting units; the battery cell protection chip comprises at least 2 battery cell detection ends; each cell connection interface is used for being connected with the multilevel to-be-charged cells which are sequentially connected in series in a one-to-one correspondence manner, each cell connection interface is connected with each signal adjustment unit in a one-to-one correspondence manner, and each signal adjustment unit is connected with the cell detection end in a one-to-one correspondence manner;

an equalization circuit comprising at least 2 equalization units; the first end of each equalization unit is connected with each cell detection end in one-to-one correspondence, the second end of each equalization unit is connected with each cell connection interface in one-to-one correspondence, and the third end of each equalization unit is connected with the cell connection interface of the corresponding cell to be charged at the previous stage.

2. The charge equalization circuit of claim 1 wherein said signal conditioning unit comprises a first resistor and a first capacitor;

the first end of the first resistor is connected with the corresponding battery cell connecting interface, and the second end of the first resistor is connected with the corresponding battery cell detecting end;

the first end of the first capacitor is connected with the second end of the corresponding first resistor, and the second end of the first capacitor is connected with the ground wire.

3. The charge equalization circuit of claim 1 wherein the equalization unit comprises a first switching tube, a second resistor, and a third resistor;

the grid electrode of the first switch tube is connected with the first end of the second resistor, and the second end of the second resistor is connected with the corresponding battery cell detection end; the source electrode of the first switch tube is connected with the corresponding battery cell detection end; the drain electrode of the first switching tube is connected with the first end of the third resistor, and the second end of the third resistor is connected with the battery cell connecting interface of the battery cell to be charged corresponding to the previous stage.

4. The charge equalization circuit of claim 1 wherein said cell protection circuit further comprises a current sampling circuit and a battery negative connection interface; the battery cell protection chip further comprises a current sampling input end;

the current sampling circuit is connected between the battery cathode connection interface and the current sampling input end.

5. The charge equalization circuit of claim 4 wherein said current sampling circuit comprises a second capacitor, a fourth resistor, and a fifth resistor;

the first end of the second capacitor is connected with the current sampling input end, and the second end of the second capacitor is connected with a ground wire; the first end of the fourth resistor is connected with the current sampling input end, the second end of the fourth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is respectively connected with a ground wire and the battery negative electrode connection interface.

6. The charge equalization circuit of claim 5 wherein said cell protection chip further comprises a discharge output and a battery output negative detection terminal; the battery cell protection circuit further comprises a second switch tube, a sixth resistor and a seventh resistor;

the first end of the sixth resistor is connected with the discharge output end, the second end of the sixth resistor is connected with the grid electrode of the second switching tube, the source electrode of the second switching tube is connected with the first end of the fifth resistor, the drain electrode of the second switching tube is used for being connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with the battery output negative electrode detection end.

7. The charge equalization circuit of claim 6 wherein said cell protection chip further comprises a charge output; the battery cell protection circuit also comprises a charging control circuit and a discharging negative electrode connection interface;

the charging control circuit is respectively connected with the charging output end, the discharging negative electrode connection interface and the drain electrode of the second switching tube.

8. The charge equalization circuit of claim 7 wherein the charge control circuit further comprises a third switching tube, a fourth switching tube, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a first diode; the battery cell protection circuit further comprises a battery anode connection interface;

the first end of the eighth resistor is connected with the charging output end; the second end of the eighth resistor is respectively connected with the first end of the ninth resistor and the grid electrode of the third switching tube; the second end of the ninth resistor is connected with the battery anode connection interface; the source electrode of the third switching tube is connected with the battery anode connecting interface; the drain electrode of the third switching tube is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the anode of the first diode, and the cathode of the first diode is respectively connected with the first end of the eleventh resistor and the grid electrode of the fourth switching tube; the second end of the eleventh resistor is connected with the source electrode of the fourth switching tube, the drain electrode of the fourth switching tube is connected with the drain electrode of the second switching tube, and the source electrode of the fourth switching tube is connected with the discharge negative electrode connection interface.

9. The charge equalization circuit of any one of claims 1 to 8 wherein the cell protection chip further comprises a low temperature detection terminal and an over temperature detection terminal; the battery cell protection circuit further comprises a twelfth resistor, a thirteenth resistor and a thermistor;

the first end of the twelfth resistor is connected with the low-temperature detection end, and the second end of the twelfth resistor is connected with the first end of the thermistor; the first end of the thirteenth resistor is connected with the over-temperature detection end, the second end of the thirteenth resistor is connected with the first end of the thermistor, and the second end of the thermistor is connected with the ground wire.

10. A battery comprising a plurality of stages of cells to be charged and a charge equalization circuit according to any one of claims 1 to 9 connected in series in sequence;

and the charge equalization circuit is connected with the multi-stage battery core to be charged.

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