CN219106419U - Battery pack and vehicle - Google Patents
Battery pack and vehicle Download PDFInfo
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- CN219106419U CN219106419U CN202222554301.1U CN202222554301U CN219106419U CN 219106419 U CN219106419 U CN 219106419U CN 202222554301 U CN202222554301 U CN 202222554301U CN 219106419 U CN219106419 U CN 219106419U
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- 238000003466 welding Methods 0.000 claims description 10
- 239000000178 monomer Substances 0.000 description 8
- 239000013256 coordination polymer Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model discloses a battery pack and a vehicle. The battery pack includes: at least one battery module, wherein the battery module at least comprises two battery cores connected in series; the battery cell is provided with an anode charging switch and a cathode charging switch, two ends of the anode charging switch are respectively connected with an anode of the battery cell and an anode charging terminal of the battery pack, and two ends of the cathode charging switch are respectively connected with a cathode of the battery cell and a cathode charging terminal of the battery pack; the battery charger further comprises a charging management unit, wherein the charging management unit is configured to control the on-off of the positive charging switch and the negative charging switch corresponding to the battery cell.
Description
Technical Field
The embodiment of the utility model relates to a battery technology, in particular to a battery pack and a vehicle.
Background
Currently, the charging strategy of lithium ion batteries is generally: and when the algebraic sum (total voltage) of all the lithium ion battery cell voltage values reaches the maximum cut-off voltage value, the charging is completed. The charging strategy has the following disadvantages: because the sign of charging completion is that total voltage reaches the maximum cut-off voltage value, consequently, the battery package often only sets up single charging circuit, because the charging circuit is single, when the battery monomer did not reach threshold voltage, was difficult to charge to the battery monomer, just so caused the lithium ion battery monomer voltage uniformity poor, the big and the high result of fault rate of pressure differential, reduced the driving mileage of new energy automobile.
Disclosure of Invention
The utility model provides a battery pack and a vehicle, which aim to connect a single battery cell with a charging device and charge the single battery cell through the charging device.
In a first aspect, an embodiment of the present utility model provides a battery pack, including: at least one battery module, wherein the battery module at least comprises two battery cores connected in series;
the battery cell is provided with a positive charging switch and a negative charging switch, two ends of the positive charging switch are respectively connected with a positive electrode of the battery cell and a positive charging terminal of the battery pack, and two ends of the negative charging switch are respectively connected with a negative electrode of the battery cell and a negative charging terminal of the battery pack;
the battery pack also comprises a charging management unit, wherein the charging management unit is configured to control the on-off of the positive charging switch and the negative charging switch corresponding to the battery cell.
Optionally, the battery cell voltage acquisition unit is further included, and the battery cell voltage acquisition unit is used for acquiring the voltage of each battery cell.
Optionally, in the series-connected battery cells, a positive charging switch connected with a first battery cell is configured as a main positive charging switch;
configuring a negative electrode charging switch connected with the last electric core in the electric cores connected in series as a main negative electrode charging switch;
a main positive electrode charging wire is adopted to connect the first electric core, the main positive electrode charging switch and the positive charging terminal of the battery pack;
the last battery cell, the main negative electrode charging switch and the negative charging terminal of the battery pack are connected by adopting a main negative electrode charging wire
And configuring the bearing current of the main positive electrode charging wire and the main negative electrode charging wire to be larger than the maximum charging current of the battery pack.
Optionally, a positive charging wire is used for connecting the battery core, the positive charging switch and a positive charging terminal of the battery pack;
a negative charging lead is adopted to connect the battery cell, a negative charging switch and a negative charging terminal of the battery pack;
and configuring the bearing current of the positive charging wire to be smaller than that of the main positive charging wire, and configuring the bearing current of the negative charging wire to be smaller than that of the main negative charging wire.
Optionally, the positive electrode of the battery core is configured with a positive electrode welding spot, and the positive electrode welding spot is used for being connected with the main positive electrode charging wire or the positive electrode charging wire;
the negative electrode of the battery core is provided with a negative electrode welding spot, and the negative electrode welding spot is used for being connected with the main negative electrode charging wire or the negative electrode charging wire.
Optionally, the battery charger further comprises an interlocking unit, wherein the interlocking unit is connected with the positive charging switch, the negative charging switch and the charging management unit;
the interlocking unit is used for disconnecting the positive charging switch and the negative charging switch of the rest battery cells when the positive charging switch and the negative charging switch of one battery cell are communicated.
Optionally, the interlocking unit comprises a first voltage dividing circuit and a plurality of interlocking control modules;
the interlocking control module comprises an operational amplifier, a second voltage dividing circuit, a switching tube and a voltage drop circuit;
the power supply end is grounded through the first voltage dividing circuit, and the voltage dividing point of the first voltage dividing circuit is also connected with the reverse input end of the operational amplifier;
the power supply end is connected with the first end of the voltage drop circuit and the non-inverting input end of the operational amplifier through the switch tube, and the second end of the voltage drop circuit is connected with the inverting input end of the operational amplifier;
the output end of the operational amplifier is grounded through the second voltage dividing circuit, and the voltage dividing point of the second voltage dividing circuit is also connected with the non-inverting input end of the operational amplifier;
the output end of the operational amplifier is also connected with the control ends of the positive charging switch and the negative charging switch;
the control end of the switching tube is connected with the charging management unit.
Optionally, the charging management system further comprises an I/O expansion unit, and the charging management unit is connected with the control end of the switching tube through the I/O expansion unit.
Optionally, the battery management device further comprises a battery management unit, wherein the positive charging switch, the negative charging switch and the charging management unit are integrated on a circuit board of the battery management unit.
Optionally, the positive charging switch and the negative charging switch use contactors.
In a second aspect, an embodiment of the present utility model further provides a vehicle, including the battery pack according to the embodiment of the present utility model.
Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a battery pack, wherein each battery cell in the battery pack is provided with an anode charging switch and a cathode charging switch, the anode of the battery cell is connected with an anode charging terminal of the battery pack through the anode charging switch, the cathode of the battery cell is connected with a cathode charging terminal of the battery pack through the cathode charging switch, the battery pack is also provided with a charging management unit, the charging management unit is used for controlling the closing of a group of anode charging switches and cathode charging switches, a corresponding battery cell can be independently connected with a charging device, at the moment, the charging device can be independently used for charging the battery cell, and meanwhile, the charging management unit is used for controlling the closing of a designated anode charging switch and a designated cathode charging switch, so that the whole battery module can be connected with the charging device, and at the moment, the charging device can be used for charging the battery module.
Based on the above, through anodal charge switch and negative pole charge switch can be nimble switch for battery module charges or for the monomer electric core charges, when being the battery module after charging, when the voltage of each electric core is different, can switch to the monomer electric core charges to improve the uniformity of each electric core, prolong the life of battery package.
According to the utility model, the single battery core is connected to the charging device through the positive charging switch and the negative charging switch, so that the overall design difficulty of the battery pack is small, and the cost is low.
Drawings
Fig. 1 is a schematic view of a battery module in an embodiment;
fig. 2 is a schematic view of another battery module according to an embodiment;
fig. 3 is a schematic diagram of an interlocking unit structure in an embodiment.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
Example 1
The embodiment provides a battery pack, which comprises at least one battery module, wherein the battery module comprises at least two battery cells connected in series, and if the battery pack comprises a plurality of battery modules, each battery module is configured to be connected in parallel.
In this embodiment, the battery cells are configured with an anode charging switch and a cathode charging switch, and specifically, each battery cell in the battery module is configured with an anode charging switch and a cathode charging switch;
for one cell, two ends of the positive electrode charging switch are respectively connected with the positive electrode of the cell and the positive charging terminal of the battery pack; both ends of the negative electrode charging switch are respectively connected with the negative electrode of the battery core and the negative charging terminal of the battery pack.
Illustratively, in this embodiment, the positive charge switch, the negative charge switch may be a contact switch, a relay, or a contactor switch device.
Illustratively, in one possible embodiment, the positive charge switch and the negative charge switch employ contactors, which may improve the charge safety of the battery pack.
In this embodiment, the connection mode between one end of the positive electrode charging switch and the positive electrode of the battery cell and the connection mode between one end of the negative electrode charging switch and the negative electrode of the battery cell are not limited;
for example, one end of the positive charge switch may be bonded or welded to the positive electrode of the battery cell through a wire, and one end of the negative charge switch may be bonded or welded to the negative electrode of the battery cell through a wire.
Fig. 1 is a schematic view of a battery module in an example, referring to fig. 1, as an embodiment, one battery module is configured with six cells (1 to 6) connected in series;
the battery cell 1 is provided with a positive charging switch S11 and a negative charging switch S12, the battery cell 2 is provided with a positive charging switch S21 and a negative charging switch S22, the battery cell 3 is provided with a positive charging switch S31 and a negative charging switch S32, the battery cell 4 is provided with a positive charging switch S41 and a negative charging switch S42, the battery cell 5 is provided with a positive charging switch S51 and a negative charging switch S52, and the battery cell 6 is provided with a positive charging switch S61 and a negative charging switch S62;
the first ends of the positive charging switches S11-S61 are respectively connected with the positive poles of the battery cores 1-6, and the second ends of the positive charging switches S11-S61 are connected with the positive charging terminal CP of the battery pack;
the first ends of the negative electrode charging switches S12 to S62 are respectively connected with the negative electrodes of the battery cells 1 to 6, and the second ends of the negative electrode charging switches S12 to S62 are connected with the negative charging terminal CN of the battery pack.
In this embodiment, the battery pack is further configured with a charging management unit, and the charging management unit is configured to control on-off of the positive charging switch and the negative charging switch corresponding to each battery cell.
In this embodiment, the charge management unit may be designed by a single chip microcomputer, a micro control unit, a charge management chip, and other devices.
Referring to fig. 1, in an exemplary embodiment, the battery pack operates in a manner including:
when the battery module is charged as a whole, the charging management unit controls the positive charging switch S11 and the negative charging switch S62 to be closed, controls the negative charging switches S12 to S52 to be opened, and controls the positive charging switches S21 to S61 to be opened;
at this time, the battery module is connected with the charging device through a loop where the positive charging switch S11 and the negative charging switch S62 are located, and the charging device charges the battery module;
when the single battery cells in the battery module are charged, a user can select the appointed single battery cells for charging;
a user can input a charging control instruction to the charging management unit, and the charging management unit controls the positive charging switch and the negative charging switch of a designated one of the battery cores to be closed according to the charging control instruction, and the positive charging switch and the negative charging switch of the other battery cores are opened;
at this time, one cell in the battery module is connected with a charging device, and the charging device charges the single cell;
the charging management unit detects the voltage of the single battery cell, and when the voltage of the single battery cell exceeds a charging threshold voltage, the charging management unit controls the positive charging switch and the negative charging switch corresponding to the battery cell to be disconnected.
The embodiment provides a battery pack, each battery cell in the battery pack is provided with an anode charging switch and a cathode charging switch, the anode of the battery cell is connected with an anode charging terminal of the battery pack through the anode charging switch, the cathode of the battery cell is connected with a cathode charging terminal of the battery pack through the cathode charging switch, the battery pack is also provided with a charging management unit, the charging management unit is used for controlling the closing of a group of anode charging switches and cathode charging switches, a corresponding battery cell can be independently connected with a charging device, at the moment, the charging device can be used for independently charging the battery cell, and meanwhile, the charging management unit is used for controlling the closing of a designated anode charging switch and a designated cathode charging switch, so that the whole battery module can be connected with the charging device;
based on the above, the battery module can be flexibly switched to charge the battery module or the single battery cell through the positive charging switch and the negative charging switch, and when the voltage of each battery cell is different after the battery module is charged, the battery module can be switched to charge the single battery cell, so that the consistency of each battery cell is improved, and the service life of the battery pack is prolonged;
in this embodiment, realize being connected monomer electric core to charging device through anodal charge switch and negative pole charge switch, the battery package overall design degree of difficulty is little, with low costs.
In one embodiment, the battery pack is further configured with a cell voltage acquisition unit for acquiring the voltage of each cell.
In this solution, the battery cell voltage acquisition unit may be configured to be connected to the charging management unit or the battery management unit, and the charging management unit or the battery management unit may be configured to display the voltage acquired by the battery cell voltage acquisition unit.
For example, when the cell voltage acquisition unit is configured, if the single cell in the battery module is charged, a user can determine the single cell to be charged according to the displayed cell voltage;
the charging management unit receives the battery cell voltage acquired by the battery cell voltage acquisition unit, and when the voltage of the single battery cell exceeds the charging threshold voltage, the charging management unit controls the positive charging switch and the negative charging switch corresponding to the battery cell to be disconnected.
For example, as an embodiment, when the cell voltage collection unit is configured, the positive charge switch, the negative charge switch, the charge management unit, and the cell voltage collection unit may be integrated on a circuit board of the battery management unit (Battery Management System, BMS);
the positive charging switch, the negative charging switch, the charging management unit and the battery cell voltage acquisition unit are integrated with the BMS, so that the assembly difficulty of the battery pack can be reduced.
As an embodiment, in a battery module, a positive electrode charging switch connected with a first cell is configured in series with the cells as a main positive electrode charging switch;
configuring a negative electrode charging switch connected with the last battery cell in the series battery cells as a main negative electrode charging switch;
a main positive electrode charging wire is adopted to connect the first battery cell, the main positive electrode charging switch and a positive charging terminal of the battery pack;
and a main negative electrode charging wire is adopted to connect the last electric core, the main negative electrode charging switch and the negative charging terminal of the battery pack.
For example, taking the battery module shown in fig. 1 as an example, the positive electrode charging switch S11 is configured as a main positive electrode charging switch (denoted by K0), and the negative electrode charging switch S62 is configured as a main negative electrode charging switch (denoted by K1).
The configuration adopts a main positive electrode charging wire to connect the positive electrode of the battery core 1, a main positive electrode charging switch K0 and a positive charging terminal CP, and adopts a main negative electrode charging wire to connect the negative electrode of the battery core 6, a main negative electrode charging switch K1 and a negative charging terminal CN.
Illustratively, in this solution, the load current of the main positive charging wire and the main negative charging wire is configured to be greater than the maximum charging current of the battery pack.
When the battery module is charged as a whole, the battery module is connected with a charging device through a main positive electrode charging wire and a main negative electrode charging wire, and the charging device charges the battery module;
in this scheme, through configuration main positive pole charging wire, main negative pole charging wire's bearing current is greater than the biggest charge current of battery package, can guarantee the charge safety when charging for this battery module.
For example, referring to the battery module shown in fig. 1, as an embodiment, a configuration is adopted in which a main positive electrode charging wire is used to connect the positive electrode of the battery cell 1, a main positive electrode charging switch (S11), and a positive charging terminal CP, and a main negative electrode charging wire is used to connect the negative electrode of the battery cell 6, a main negative electrode charging switch (S62), and a negative charging terminal CN;
the battery pack is characterized in that positive charging leads are correspondingly connected with battery cores (2-5), positive charging switches (S21-S51) and positive charging terminals CP of the battery pack; the negative charging lead is correspondingly connected with the battery core (2-5), the negative charging switch (S22-S52) and the negative charging terminal CN of the battery pack;
the battery cell 1, the negative electrode charging switch S12 and the negative charging terminal CN are connected by a negative electrode charging wire, and the battery cell 6, the positive electrode charging switch S61 and the positive charging terminal CP are connected by a positive electrode charging wire.
In this embodiment, the load current of the positive charging wire may be configured to be less than or equal to the load current of the main positive charging wire, and the load current of the negative charging wire may be configured to be less than or equal to the load current of the main negative charging wire.
Illustratively, in one possible embodiment, the wire diameter of the positive charging wire is configured to be smaller than the wire diameter of the main positive charging wire, i.e., the carrying current of the positive charging wire is configured to be smaller than the carrying current of the main positive charging wire;
the wire diameter of the negative electrode charging wire is smaller than that of the negative electrode charging wire, namely, the bearing current of the negative electrode charging wire is smaller than that of the main negative electrode charging wire.
When the charging current of the single battery cell is smaller than the charging current of the battery module, the wire diameters of the positive charging wire and the negative charging wire are smaller than those of the main positive charging wire and the main negative charging wire, so that the use cost of the wire can be reduced.
In the scheme, the positive electrode of the battery core is provided with a positive electrode welding spot, and the positive electrode welding spot is used for being connected with a main positive electrode charging wire or a positive electrode charging wire;
the negative electrode of the battery core is provided with a negative electrode welding spot which is used for being connected with a main negative electrode charging wire or a negative electrode charging wire.
Fig. 2 is a schematic view of another battery module according to an embodiment, referring to fig. 2, the battery pack further includes an interlocking unit 200, and the interlocking unit 200 is connected with the positive charging switches (S11 to S61), the negative charging switches (S12 to S62), and the charging management unit 100 on the basis of the scheme shown in fig. 1.
Illustratively, in this solution, the interlocking unit may be designed based on devices such as an operational amplifier, a decoder (e.g., CD 4028B), and the like;
the configuration interlocking unit is used for: when the battery cells are charged, and the positive electrode charging switch and the negative electrode charging switch of one battery cell are communicated, the positive electrode charging switch and the negative electrode charging switch of the other battery cells are controlled to be disconnected.
In this scheme, when charging for the monomer electric core in the battery module, user to charge management unit input charge control instruction, the positive pole that charges switch, the negative pole that charges switch of the battery core of charge management unit control through interlocking unit are closed, and the positive pole that charges switch, the negative pole that charges switch of other electric cores are opened, and then realize charging to the monomer electric core.
Fig. 3 is a schematic diagram of an interlocking unit in an embodiment, referring to fig. 3, as an alternative embodiment, the interlocking unit includes a first voltage dividing circuit 1000, and a plurality of interlocking control modules (six interlocking control modules, which are the same as the number of the battery cells in the scheme shown in fig. 2).
In this scheme, the structure of each interlock control module is the same, taking the first interlock control module as an example, the interlock control module includes an operational amplifier U1, a second voltage dividing circuit 11, a switching tube 12, and a voltage drop circuit 13.
Referring to fig. 2 and 3, the power supply terminal VCC is grounded through the first voltage dividing circuit 1000, and the voltage dividing point of the first voltage dividing circuit 1000 is also connected to the inverting input terminal of the operational amplifier U1;
the power supply end VCC is connected with a first end of the voltage drop circuit 13 and a non-inverting input end of the operational amplifier U1 through the switching tube 12, and a second end of the voltage drop circuit 13 is connected with an inverting input end of the operational amplifier U1;
the output end SS1 of the operational amplifier U1 is grounded through a second voltage dividing circuit 11, and the voltage dividing point of the second voltage dividing circuit 11 is also connected with the non-inverting input end of the operational amplifier U1;
the output end SS1 of the operational amplifier U1 is also connected with the control ends of the positive electrode charging switch S11 and the negative electrode charging switch S12;
the control terminal of the switching tube 13 is connected to the charge management unit 100.
In this embodiment, the switching transistor may be a triode, the voltage dividing circuit includes a voltage dividing resistor, and the voltage drop circuit may be at least one diode.
In this embodiment, the charge management unit 100 is configured to control the switch tube to be turned on through a pulse signal, and when charging the single battery cell, taking the first interlocking control module and the sixth interlocking control module as an example, the working process of the interlocking unit includes:
the interlocking unit is electrified, in an initial state, the switching tubes 12 to 62 are disconnected, the non-inverting input ends of the operational amplifiers U1 to U6 are low level, the inverting input ends of the operational amplifiers are high level, and each operational amplifier outputs low level;
when the charge management unit 100 controls the switch tube 12 to be turned on, the non-inverting input terminal is at a high level and is higher than the level of the inverting input terminal (due to the voltage drop of the voltage drop circuit 13), the operational amplifier U1 outputs a high level, so that the positive charge switch S11 and the negative charge switch S12 are closed;
the operational amplifier U1 outputs a high level, and after the switching tube 12 is turned off, the voltage at the non-inverting input terminal of the operational amplifier U1 is the voltage divided by the second voltage dividing circuit 11, the voltage at the inverting input terminal is the voltage divided by the first voltage dividing circuit 1000, the voltage at the non-inverting input terminal is still higher than the voltage at the inverting input terminal, and the operational amplifier U1 continuously outputs a high level;
when the charge management unit 100 controls the switch tube 62 to be turned on, the voltage at the reverse input end of the operational amplifier U1 is the power supply voltage passing through the voltage drop circuit 63, which is higher than the voltage at the same-direction input end of the operational amplifier U1, and the operational amplifier U1 outputs a low level to disconnect the positive charging switch S11 and the negative charging switch S12;
meanwhile, when the charge management unit 100 controls the switch tube 62 to be turned on, the operational amplifier U6 outputs a high level, so that the positive charge switch S61 and the negative charge switch S62 are closed;
after the interlocking unit is powered down, the positive electrode charging switches S11-S61 and the negative electrode charging switches S12-S62 are disconnected, and the charging of the single battery cells is stopped.
In the scheme, the battery pack is provided with the interlocking units, when the interlocking units are configured to charge the single battery cells in the battery module, if the positive charging switch and the negative charging switch of one battery cell are closed, the positive charging switch and the negative charging switch of the other battery cells are controlled to be opened, and based on the interlocking units, the problem that the single battery cells are charged through manual control, and a plurality of single battery cells are connected to a charging device due to the fact that a plurality of charging control instructions are input in a short time, so that the charging is abnormal can be avoided.
Illustratively, on the basis of the scheme shown in fig. 3, the battery pack further comprises an I/O expansion unit, and the charging management unit is connected with the control end of the switching tube through the I/O expansion unit.
By way of example, in the present solution, when the number of the electric cores in the battery module is large (i.e., when the number of the interlocking control modules is large), the I/O expansion unit is connected to the charge management unit and the interlocking unit, so that the problem that the number of the I/O ports of the charge management unit is difficult to meet the control requirement can be avoided.
For example, based on the scheme shown in fig. 1, as an alternative, the BMS may be configured to implement charging control of the battery pack, including collecting voltages of the unit cells, and charging a designated one of the unit cells individually according to the voltage control of the unit cells.
For example, the BMS may be configured to implement charge control of the battery pack as follows:
controlling the battery module (or battery pack) to be charged integrally;
at this time, the BMS controls the positive charge switch S11 and the negative charge switch S62 to be turned on, controls the negative charge switches S12 to S52 to be turned off, and controls the positive charge switches S21 to S61 to be turned off;
the BMS sends a first charging request instruction to the charging device, and the charging device responds to the first charging request instruction and provides a required voltage and a first required current required by charging;
the BMS detects the cell voltages, and records the positions (or numbers) of the cell voltages when one cell voltage reaches a charging threshold voltage;
the BMS sends a charging stopping request instruction to the charging device, the charging stopping device stops providing charging voltage and charging current, and the BMS controls the positive charging switch S11 and the negative charging switch S62 to be closed;
controlling the battery cells to be charged independently;
the positive electrode charging switch S11 and the negative electrode charging switch S12 of the control battery cell 1 are closed, and the positive electrode charging switches S21-S61 and the negative electrode charging switches S22-S62 are controlled to be opened;
the BMS sends a second charging request instruction to the charging device, and the charging device responds to the second charging request instruction and provides a required voltage and a second required current (smaller than the first required current) for charging;
when the voltage of the battery cell 1 reaches a charging threshold voltage, the BMS sends a charging stopping request instruction to the charging device, the charging stopping device stops providing charging voltage and charging current, and the BMS controls the positive charging switch S11 and the negative charging switch S12 to be disconnected;
the same as the control of the charging mode of the battery cell 1, except for the battery cell of which the position is recorded in the whole charging process of the battery module, the BMS sequentially controls the charging device to charge the battery cell to the charging threshold voltage according to the sequence from the battery cell 1 to the battery cell 6.
Example two
The present embodiment provides a vehicle configured with any one of the battery packs described in the first embodiment, and the beneficial effects thereof are the same as those described in the first embodiment, and are not described herein again.
Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.
Claims (10)
1. A battery pack, comprising: at least one battery module, wherein the battery module at least comprises two battery cores connected in series;
the battery cell is provided with a positive charging switch and a negative charging switch, two ends of the positive charging switch are respectively connected with a positive electrode of the battery cell and a positive charging terminal of the battery pack, and two ends of the negative charging switch are respectively connected with a negative electrode of the battery cell and a negative charging terminal of the battery pack;
the battery pack also comprises a charging management unit, wherein the charging management unit is configured to control the on-off of the positive charging switch and the negative charging switch corresponding to the battery cell.
2. The battery pack of claim 1, wherein a positive charge switch connected to a first one of said cells in the series is configured as a primary positive charge switch;
configuring a negative electrode charging switch connected with the last electric core in the electric cores connected in series as a main negative electrode charging switch;
a main positive electrode charging wire is adopted to connect the first electric core, the main positive electrode charging switch and the positive charging terminal of the battery pack;
a main negative electrode charging wire is adopted to connect the last electric core, the main negative electrode charging switch and the negative charging terminal of the battery pack;
and configuring the bearing current of the main positive electrode charging wire and the main negative electrode charging wire to be larger than the maximum charging current of the battery pack.
3. The battery pack of claim 2, wherein a positive charging wire is used to connect the cells except for the first one of the cells, a positive charging switch, and a positive charging terminal of the battery pack;
a negative electrode charging lead is adopted to connect the battery cell except the last battery cell, a negative electrode charging switch and a negative charging terminal of the battery pack;
and configuring the bearing current of the positive charging wire to be smaller than that of the main positive charging wire, and configuring the bearing current of the negative charging wire to be smaller than that of the main negative charging wire.
4. The battery pack of claim 3, wherein the positive electrode of the cell is configured with a positive electrode welding point for accessing the main positive electrode charging wire or the positive electrode charging wire;
the negative electrode of the battery core is provided with a negative electrode welding spot, and the negative electrode welding spot is used for being connected with the main negative electrode charging wire or the negative electrode charging wire.
5. The battery pack of any one of claims 1 to 4, further comprising an interlock unit connected to the positive charge switch, the negative charge switch, and the charge management unit;
the interlocking unit is used for disconnecting the positive charging switch and the negative charging switch of the rest battery cells when the positive charging switch and the negative charging switch of one battery cell are communicated.
6. The battery pack of claim 5, wherein the interlocking unit comprises a first voltage divider circuit, a plurality of interlocking control modules;
the interlocking control module comprises an operational amplifier, a second voltage dividing circuit, a switching tube and a voltage drop circuit;
the power supply end is grounded through the first voltage dividing circuit, and the voltage dividing point of the first voltage dividing circuit is also connected with the reverse input end of the operational amplifier;
the power supply end is connected with the first end of the voltage drop circuit and the non-inverting input end of the operational amplifier through the switch tube, and the second end of the voltage drop circuit is connected with the inverting input end of the operational amplifier;
the output end of the operational amplifier is grounded through the second voltage dividing circuit, and the voltage dividing point of the second voltage dividing circuit is also connected with the non-inverting input end of the operational amplifier;
the output end of the operational amplifier is also connected with the control ends of the positive charging switch and the negative charging switch;
the control end of the switching tube is connected with the charging management unit.
7. The battery pack according to claim 6, further comprising an I/O expansion unit, wherein the charge management unit is connected to the control terminal of the switching tube through the I/O expansion unit.
8. The battery pack of any one of claims 1 to 4, further comprising a battery management unit, wherein the positive charge switch, the negative charge switch, and the charge management unit are integrated on a circuit board of the battery management unit.
9. The battery pack of any one of claims 1 to 4, wherein the positive charge switch and the negative charge switch employ contactors.
10. A vehicle comprising the battery pack according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222554301.1U CN219106419U (en) | 2022-09-23 | 2022-09-23 | Battery pack and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222554301.1U CN219106419U (en) | 2022-09-23 | 2022-09-23 | Battery pack and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN219106419U true CN219106419U (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222554301.1U Active CN219106419U (en) | 2022-09-23 | 2022-09-23 | Battery pack and vehicle |
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| Country | Link |
|---|---|
| CN (1) | CN219106419U (en) |
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