CN115782687A

CN115782687A - Maintenance equipment and charging and discharging method of battery module

Info

Publication number: CN115782687A
Application number: CN202211711411.2A
Authority: CN
Inventors: 王维林
Original assignee: Autel Intelligent Technology Corp Ltd
Current assignee: Autel Intelligent Technology Corp Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-03-14
Anticipated expiration: 2042-12-29
Also published as: CN115782687B

Abstract

The embodiment of the invention provides maintenance equipment of a battery module, which comprises at least two power modules, a circuit switching module and a control module; the control module is used for controlling the working state of the line switching module according to the charging and discharging parameters of the battery module, and the line switching module is used for switching the connection state among the power modules and generating a charging loop and switching the connection state among the power modules and generating a discharging loop under different working states. In the maintenance equipment, the control module can switch the connection state between each power supply module and each power module by controlling the working state of the line switching module so as to generate a charging loop or a discharging loop, thereby improving the voltage range supported by the maintenance equipment.

Description

Maintenance equipment and charging and discharging method of battery module

Technical Field

The embodiment of the invention relates to the technical field of battery modules, in particular to a maintenance device and a charging and discharging method of a battery module.

Background

New energy automobile battery management usually includes the battery module to new energy automobile and changes, application scenes such as ageing aassessment, storage maintenance, transportation, under these application scenes, needs maintenance equipment to charge or discharge the battery.

When the battery modules of different automobiles are maintained by using the maintenance equipment, the voltage difference between the battery modules of different automobiles is very large, the voltage of the battery modules of most of current automobile models is between 5V and 120V, and at present, the voltage support range is small and the universality is poor for the existing maintenance equipment.

Disclosure of Invention

The embodiment of the invention aims to provide maintenance equipment for a battery module, which can improve the voltage support range and improve the universality of the maintenance equipment.

In a first aspect, one technical solution adopted in the embodiments of the present invention is: the maintenance equipment of the battery module is provided and comprises at least two power modules, a line switching module and a control module; the input end of the power supply module is used for connecting an alternating current power supply, the at least two power supply modules correspond to the at least two power modules one by one, the first output end of the power supply module is connected with the first end of the power module through the control module, the second output end of the power supply module is connected with the second end of the power module through the control module, and the power supply module is used for converting the alternating current into direct current; the circuit switching module is provided with at least two first ends and at least two second ends, a third end of each power module corresponds to each first end of the circuit switching module one by one, a fourth end of each power module corresponds to each second end of the circuit switching module one by one, in each power module, the third end of each power module is respectively connected with the first end of the power module and the first end of the circuit switching module, the fourth end of each power module is respectively connected with the second end of the power module and the second end of the circuit switching module, the third end of the circuit switching module is used for being connected with the first end of the battery module, and the fourth end of the circuit switching module is used for being connected with the second end of the battery module; the control module is also respectively connected with the battery module, the circuit switching module, each power supply module and each power module, and is used for controlling the working state of the circuit switching module according to the charge and discharge parameters of the battery module; the circuit switching module is used for switching the connection state among the power modules and generating a charging circuit and switching the connection state among the power modules and generating a discharging circuit under different working states.

In this embodiment, in the maintenance device, the control module may switch the connection state between each power module and each power module by controlling the working state of the line switching module to make the power modules in the parallel connection state or the series connection state, so as to change the voltage charged by the battery module through the power module or change the voltage discharged by the battery module through the power module, thereby improving the voltage range and the universality supported by the maintenance device

In some embodiments, each of the power modules includes a first switch and a discharge unit; in each power module, the first switch and the discharge unit are connected in series between a third terminal of the power module and a fourth terminal of the power module, and the first switch is further connected to the control module.

In this embodiment, the first switch is arranged to establish or disconnect the connection state between the discharging unit and the battery module, so that the connection state between the discharging unit and the battery module can be established through the first switch when discharging, and the connection state between the discharging unit and the battery module can be disconnected through the first switch when charging, thereby ensuring normal charging and discharging operation.

In some embodiments, the maintenance device further comprises a sampling unit; the sampling unit is arranged in the charging loop and the discharging loop and is also connected with the control module; the control module is used for acquiring current sampling signals through the sampling unit and controlling voltage signals output to the power modules or the power modules according to the current sampling signals.

In this embodiment, by providing the sampling unit, a sampling loop can be provided for the control module, and the power module or the power module is controlled based on the current sampling signal to control the charging current or the discharging current of the battery module.

In some embodiments, the control module comprises an amplifying unit and a feedback operational amplifying unit; the input end of the amplifying unit is used for accessing the current sampling signal, the output end of the amplifying unit is connected with the first input end of the feedback operational amplifying unit, and the amplifying unit is used for amplifying the current sampling signal; the second input end of the feedback operational amplifier unit is used for accessing a voltage reference value, the output end of the feedback operational amplifier unit is connected with the power module, or the output end of the feedback operational amplifier unit is connected with the first switch.

In this embodiment, by providing the amplifying unit and the feedback operational amplifying unit, the charging current or the discharging current can be adjusted based on the current sampling signal to reach the target current, thereby reducing the complexity of current control and the control efficiency.

In some embodiments, the control module further comprises a zener diode; the voltage stabilizing diode is connected between the output end of the feedback operational amplifier unit and the ground. In this embodiment, by providing the zener diode, the output voltage is ensured not to exceed the voltage threshold of the zener diode, and the safety of the circuit operation is ensured.

In some embodiments, the discharge unit includes at least one second switch and at least one resistor; the second switches are in one-to-one correspondence with the resistors and are connected in parallel, the second switches are further connected with the control module, and the control module is further used for acquiring discharge parameters and controlling the working state of the second switches according to the discharge parameters. In this embodiment, by providing the second switch and the resistor, the resistor connected to the discharge loop can be adjusted according to actual needs, so as to adjust the current during discharging, so that the discharge current satisfies the discharge condition.

In some embodiments, the control module further comprises a micro control unit, an internal sampling interface and an external sampling interface, and the maintenance device further comprises an internal sampling unit and an external sampling unit; the micro control unit is connected with the internal sampling interface through the internal sampling unit, the internal sampling interface is also used for being in communication connection with the battery module, the micro control unit is in communication connection with the external sampling unit through the external sampling interface, and the external sampling unit is also used for being in communication connection with the battery module; the internal sampling interface is an analog sampling interface, and the external sampling interface is a digital sampling interface. In this embodiment, the control module may expand the sampling channel through the external sampling interface, thereby satisfying the sampling requirement.

In some embodiments, the maintenance device further comprises a housing and an interaction module; one side of the interaction module is arranged on the surface of the shell, each power supply module, each power module, the circuit switching module and the control module are arranged in the shell, and the interaction module is connected with the control module. In this embodiment, man-machine interaction management can be achieved by setting the interaction module.

In a second aspect, an embodiment of the present invention further provides a charging and discharging method, which is applied to the maintenance device according to any one of the first aspect, where the method includes: acquiring the current voltage and the target voltage of the battery module; and controlling the line switching of the maintenance equipment according to the current voltage and the target voltage to generate a charging loop or a discharging loop, wherein the charging loop is used for charging the battery module, and the discharging loop is used for discharging the battery module. In this embodiment, the control module may analyze whether the parallel connection state or the series connection state is adopted according to the target voltage and the current battery voltage, determine to generate the discharge loop or the charge loop, and satisfy the charge and discharge parameters of the battery module. And when the voltage is not in the working range of the maintenance equipment, the voltage can be fed back to a user, so that the working safety of the maintenance equipment is ensured.

In some embodiments, the discharge circuit includes a first switch and a discharge unit, the discharge unit includes at least one resistor, and the charge and discharge method further includes: acquiring the discharge voltage required to be borne by the discharge unit, the discharge current required by the battery module, the resistance value set of each resistor and the maximum allowable power of the first switch; obtaining a resistance value required by discharging according to the discharging voltage and the discharging current; and determining a discharge resistor needing to be connected into a discharge loop according to the resistance value required for discharge and the resistance value set, and controlling the discharge resistor to be connected into the discharge loop, wherein after the discharge resistor is connected into the discharge loop, the distribution power of the first switch is less than or equal to the maximum allowable power. In this embodiment, by the above method, the connected discharge resistor can be flexibly determined to adjust the magnitude of the discharge current during discharge so as to satisfy the discharge condition.

Compared with the prior art, the invention has the beneficial effects that: different from the situation of the prior art, the embodiment of the invention provides a maintenance device for a battery module, wherein the maintenance device comprises at least two power modules, a line switching module and a control module; the input end of the power supply module is used for connecting an alternating current power supply, the first output end of the power supply module is connected with the first end of the corresponding power module, and the second output end of the power supply module is connected with the second end of the corresponding power module; the third end of the power module is respectively connected with the first end of the corresponding power module, the corresponding first end of the line switching module and the corresponding second end of the line switching module, and the fourth end of the line switching module is respectively connected with the second end of the corresponding power module and the corresponding second end of the line switching module; the control module is also respectively connected with the battery module, the circuit switching module, each power supply module and each power module, and is used for controlling the working state of the circuit switching module according to the charge and discharge parameters of the battery module; the circuit switching module is used for switching the connection state among the power modules and generating a charging loop and switching the connection state among the power modules and generating a discharging loop under different working states. In the maintenance equipment, the control module can switch the connection state between each power supply module and each power module by controlling the working state of the circuit switching module so that the power modules are in a parallel connection state or a series connection state, thereby changing the voltage charged by the battery module through the power supply module or changing the voltage discharged by the battery module through the power module, and further improving the voltage range and the universality supported by the maintenance equipment.

Drawings

The embodiments are illustrated by the figures of the accompanying drawings which correspond and are not meant to limit the embodiments, in which elements/modules and steps having the same reference number designation may be referred to by similar elements/modules and steps, unless otherwise indicated, and in which the drawings are not to scale.

Fig. 1 is a block diagram of a maintenance device according to an embodiment of the present invention;

fig. 2 is a block diagram of another maintenance device according to an embodiment of the present invention;

fig. 3 is a schematic connection diagram of a line switching module in a first working state according to an embodiment of the present invention;

fig. 4 is a schematic connection diagram of a line switching module in a second working state according to an embodiment of the present invention;

fig. 5 is a schematic connection diagram of a line switching module according to an embodiment of the present invention, where the line switching module adopts a jumper mode;

FIG. 6 is a schematic structural diagram of a low-voltage interlock mechanism check plug according to an embodiment of the present invention;

fig. 7 is a schematic connection diagram of a circuit switching module according to an embodiment of the present invention, in a relay switch manner;

fig. 8 is a schematic diagram illustrating a connection state between the maintenance device and the battery module according to the embodiment of the present invention;

fig. 9 is a schematic view illustrating another connection state between the maintenance device and the battery module according to the embodiment of the present invention;

FIG. 10 is a schematic circuit diagram of a portion of a control module according to an embodiment of the present invention;

fig. 11 is a schematic circuit diagram of a part of a power module according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.

For a battery module of a new energy automobile, the battery module is charged and discharged to an accurate target voltage by replacing with maintenance equipment during replacement so as to meet replacement conditions; when aging evaluation is carried out, deep charging and deep discharging of the battery module are required to be carried out quickly by using maintenance equipment; in warehousing maintenance, the battery is generally charged to 50% by using maintenance equipment; before shipping, the batteries need to be discharged to below 30% with maintenance equipment. In the charging and discharging process, the maintenance equipment also needs to be capable of flexibly adjusting the current in the charging and discharging process, for example, when the charging is accurate, the charging is carried out by using a small current, and when the charging is carried out with high efficiency, the charging is carried out by using a large current. In addition, in the charging and discharging process, the monitoring of the cell voltage is very important, the voltage range of the battery module is wide, the difference of the number of the cells is large, and the cell monitoring range also needs to be matched with the voltage range of the module.

In summary, for the maintenance tool, the problems of wide voltage support, wide current control, and multi-channel monitoring capability need to be solved. In order to solve the above technical problems, embodiments of the present invention provide a maintenance device for a battery module, which can improve a voltage support range and a current support range, and improve a sampling channel, thereby expanding an application scenario of the maintenance device.

In a first aspect, an embodiment of the present invention provides a maintenance apparatus for a battery module, please refer to fig. 1, where the maintenance apparatus includes at least two power modules 10, at least two power modules 20, a line switching module 30, and a control module 40.

The input end of the power module 10 is used for connecting an alternating current power supply, at least two power modules 10 are in one-to-one correspondence with at least two power modules 20, a first output end M1 of the power module 10 is connected with a first end N1 of the power module 20 through a control module 40, and a second output end M2 of the power module 10 is connected with a second end N2 of the power module 20 through the control module 40. The line switching module 30 has at least two first ends (V1 +, V2+, \ 8230 \ 8230, V (N-1) +, vn +), and at least two second ends (V1-, V2-, \ 8230 \ 8230;, V (N-1) -, vn +), a third end N3 of each power module 20 corresponds to each first end (V1 +, V2+, \ 8230;, V (N-1) +, vn +) of the line switching module 30 one by one, a fourth end N4 of each power module 20 corresponds to each second end (V1-, V2- \ 8230;, V (N-1) -, vn +) of the line switching module 30 one by one, in each power module, the third end N3 of the power module 20 is connected to the first end N1 of the power module 20 and the first end of the line switching module 30, the fourth end N4 of the power module 20 is connected to the second end N2 of the power module 20, and the second end of the line switching module 30, and the third end N2 of the line switching module 200 is connected to the battery switching module for the second end of the line switching module. The control module 40 is also connected to the battery module 200, the line switching module 30, the power modules 10, and the power modules 20, respectively.

The power module 10 is used for converting ac power into dc power. The control module 40 is used for controlling the working state of the line switching module 30 according to the charging and discharging parameters of the battery module 200. The line switching module 30 is configured to switch the connection state between the power modules 10 and generate a charging circuit and switch the connection state between the power modules 20 and generate a discharging circuit in different operation states.

The power module 10 may employ any suitable circuit for converting ac power to dc power in the prior art, and will not be described herein. Specifically, the control module 40 is further connected to a control interface of the power module 10, and the control module 40 can control the output power of the power module 10, such as control the output voltage and the output current, or control the output voltage by controlling the input voltage or control the input current by controlling the input current through the control interface. The control mode of the control module 40 for the power module 10 may be a digital communication control mode, an analog signal control mode, a constant voltage control mode, a constant current control mode, etc., so that the control interface of the power module 10 may be set according to actual needs, thereby configuring different power supplies, improving flexibility of design and reducing design cost, and in addition, the specific control flow of the control module 40 for controlling the power module 10 may refer to the corresponding prior art, which is not limited herein.

The power module 20 may be a discharge load, which may be used to consume electrical energy. The number of battery modules 200 of which n is the power module 20 includes at least one set of battery cells, and the battery cells may be connected in series or in parallel.

The charging and discharging parameters comprise charging parameters and discharging parameters, the charging parameters comprise charging voltage, charging current, charging power and the like, and the discharging parameters comprise discharging voltage, discharging current, discharging power and the like.

Referring to fig. 2, the control module 40 includes a micro control unit 44, and the micro control unit 44 is an STM16, an STM32, or any other suitable micro-processing controller, which is configured to receive, process, and output data.

In the maintenance device, the working states of the line switching module 30 include a first working state and a second working state, the first working state is a state in which each first end of the line switching module 30 is connected to the third end of the line switching module 30, each second end of the line switching module 30 is connected to the fourth end of the line switching module 30, the second working state is a state in which each first end and each second end of the line switching module 30 are sequentially and alternately connected, and the first end at the head end is further connected to the third end V + of the line switching module 30, and the last second end at the tail end is further connected to the fourth end V-of the line switching module 30. Referring to fig. 3, fig. 3 is a schematic connection diagram of a line switching module in a first working state according to an embodiment of the present invention. In fig. 3, when the line switching module 30 is in the first working state, the first ends (V1 +, V2+ \ 8230 \ 8230, V (N-1) +, vn +) of the line switching module 30 are connected to the third end V + of the line switching module 30, and the second ends (V1-, V2- \\ 8230 \\ 8230 \ (N-1) -, vn-) of the line switching module 30 are connected to the fourth end V-of the line switching module 30, at this time, the first ends of the power modules 10 and the third ends N3 of the power modules 20 are connected to the first end of the battery module 200, the second end of the power modules 10 and the fourth end N4 of the power modules 20 are connected to the second end of the battery module 200, that is, the power modules 10 are in the parallel connection state, and can provide a charging loop for the battery module 200, and the power modules 20 are in the parallel connection state, and can provide a discharging loop for the battery module 200, thereby increasing charging and discharging current.

Referring to fig. 4, fig. 4 is a schematic connection diagram of a line switching module in a second working state according to an embodiment of the present invention. In fig. 4, when the line switching module 30 is in the second operating state, the first ends (V1 +, V2+, \8230, 8230, V (n-1) +, vn +) of the line switching module 30 and the second ends (V1-, V2-, \8230, V (n-1) -, vn-) are alternately connected in sequence, and the first end V1+ at the head end is further connected to the third end V + of the line switching module 30, and the last second end Vn at the tail end is further connected to the fourth end V-of the line switching module 30, at this time, the power modules 10 and the battery modules 200 are sequentially connected in series, and the power modules 20 and the battery modules 200 are sequentially connected in series, that is, the power modules 10 are in the series connection state and can provide a charging loop for the battery modules 200, and the power modules 20 are in the series connection state and can provide a discharging loop for the battery modules 200, thereby increasing charging and discharging voltages. It can be understood that, in fig. 3 and 4, each first terminal (V1 +, V2+, \ 8230; \ 8230;, V (N-1) +, vn +) of the line switching module 30 is respectively connected to the first terminal of the corresponding power module 10 and the third terminal N3 of the corresponding power module 20, each second terminal (V1-, V2-, \ 8230;, V (N-1) -, vn-) of the line switching module 30 is respectively connected to the second terminal of the corresponding power module 10 and the fourth terminal N4 of the corresponding power module 20, the third terminal V + of the line switching module 30 is connected to the first terminal of the battery module 200, and the fourth terminal V-of the line switching module 30 is connected to the second terminal of the battery module 200.

It can be seen that, in the maintenance device, the control module 40 may control the working state of the line switching module 30 according to the charging and discharging parameters, so as to enable the power modules 10 or the power modules 20 to switch the serial connection state or the parallel connection state, and meet the charging and discharging parameters, specifically, when the output voltage range of a single power module 10 is small, that is, the charging voltage is small, the line switching module 30 may be controlled to be in the second working state, so as to enable at least two power modules 10 to be in the serial connection state, so as to increase the output voltage of the power modules 10, that is, the charging voltage; alternatively, when the output current of a single power module 10 is small, that is, the charging current is small, the circuit switching module 30 may be controlled to be in the first operating state, so that at least two power modules 10 are in the parallel connection state, and the output current of the power modules 10 is increased, that is, the charging current is increased. Similarly, when the discharge voltage of the battery module 200 discharged through a single power module 20 is small, the circuit switching module 30 may be controlled to be in the second working state, so that at least two power modules 20 are in the serial connection state, thereby increasing the discharge voltage of the battery module 200; alternatively, when the discharge current of the battery module 200 discharged through a single power module 20 is small, the circuit switching module 30 may be controlled to be in the first operating state, so that at least two power modules 20 are connected in parallel, thereby increasing the discharge current of the battery module 200. In the maintenance equipment, the working state of the line switching module 30 can be controlled by the control module 40, so that the series connection state or the parallel connection state of at least two power modules 10 or at least two power modules 20 is controlled, the battery can meet the parameter conditions of charging and discharging voltage, charging and discharging current and the like of charging and discharging of the battery in the charging and discharging process, the connection state between the power modules 10 can be switched according to the charging parameters during charging, the connection state between the power modules 20 can be switched according to the discharging parameters during discharging, and the voltage range, the universality and the application range supported by the maintenance equipment are improved. Moreover, the charging and discharging integrated design of the maintenance equipment can support charging application scenes and discharging application scenes, the charging and discharging design is integrated, the input cost of a user is reduced, and the application scenes of the maintenance equipment are improved.

In some embodiments, referring to fig. 2, the control module 40 further includes a plug 45, and each power module 10 can be connected to each power module 20 through the plug 45. If the power module 10 is a circuit for converting an ac power into a dc power, the plug 45 is a dc plug, and the detailed structure thereof can be referred to the prior art and will not be described herein. In some embodiments, referring to fig. 2, the line switching module 30 includes a switch unit 31, where the switch unit 31 has at least two first terminals, at least two second terminals, a third terminal and a fourth terminal, where each first terminal of the switch unit 31 is connected to the third terminal N3 of each power module 20 in a one-to-one correspondence manner, each second terminal of the switch unit 31 is connected to the fourth terminal N4 of each power module 20 in a one-to-one correspondence manner, the third terminal of the switch unit 31 is connected to the first terminal of the battery module 200, the fourth terminal of the switch unit 31 is connected to the second terminal of the battery module 200, and the switch unit 31 is further connected to the control module 40. In this embodiment, the control module 40 may control the switch unit 31 to enable the switch unit 31 to establish a connection state between each first terminal, each second terminal, each third terminal, and each fourth terminal, so as to switch the connection state between each power module 10 and each power module 20.

In some embodiments, the switch unit 31 may adopt at least one of a jumper, a null switch, and a relay switch, or a combination thereof.

Taking two power modules and two power modules as examples, when jumper switching is adopted, attention should be paid to a fool-proof design to prevent the series plug and the parallel plug from being connected in a mixed manner. For example, referring to (a) and (b) in fig. 5, the serial jumper in (b) in fig. 5 can only support V2+ and V1-which need to be shorted, and the position is different from the parallel connection shown in (a) in fig. 5, so that the mixed insertion can be avoided.

In addition, the jumper plug can be provided with insertion ready detection, so that heating or arc generation caused by high resistance of a circuit can be avoided when the jumper plug is not inserted in place or is in poor contact, faults are avoided, and safety is improved. As shown in fig. 5, the low-voltage interlock mechanism checks that the resistance Rp on the interlock line on the plug is set at the inserted end, and after the contact P1 and the contact P2 of the plug are in contact with the inserted end, whether the contact of the plug is good or not can be determined by detecting whether the resistance on the interlock line is in a reasonable range, so that the working safety of the maintenance equipment is improved. After the circuit is switched, the correctness of the circuit configuration can be analyzed by detecting the resistance on the interlocking line, so that the safety and the reliability of the maintenance equipment are improved.

When switching is performed by using a relay, as shown in fig. 7, when the relay is connected in parallel, the micro control unit 44 may control the relay switch K11 and the relay switch K11 to be turned on, and the relay switch K13 to be turned off; when the relay switches K11 and K12 are connected in series, the micro control unit 44 controls the relay switches K13 to be turned on and off. In practical applications, the specific structure of the switch unit 31 may be set according to actual needs, and is not limited herein.

In this embodiment, at least one of a jumper, an air switch, and a relay switch, or a combination thereof is provided as a switch unit, so that flexibility of circuit design can be improved, and in addition, the switching device can be selected to improve safety and reliability of a circuit in a high-voltage and high-current environment, and the switching device is easily used for learning and use, thereby improving usability of maintenance equipment.

In some embodiments, referring to fig. 2, the line switching module further includes a switch K and at least two fuses (e.g., F1 and F2), the switch K is connected between the first end of the battery module 200 and the fourth end of the switch unit 31, each fuse (e.g., F1 and F2) is connected between the third end of the corresponding power module and the corresponding first end of the switch unit 31, the connection state between the maintenance device and the battery module 200 can be disconnected or conducted by setting the switch K, the connection state between the maintenance device and the battery module is flexibly switched, and the fuses are additionally provided, so that the safety of the maintenance device can be improved.

In some embodiments, referring to fig. 2, each power module 20 includes a first switch 21 and a discharge unit 22. In each power module 20, the first switch 21 and the discharge unit 22 are connected in series between the third terminal N3 of the power module 20 and the fourth terminal N4 of the power module 20, and the first switch 21 is also connected to the control module 40. The discharge unit 22 is a load that can consume electric energy.

In the maintenance apparatus, please refer to (a) in fig. 5, the control module 40 may control the switch unit 31 to be in the first working state, such that the first end V1 of the line switching module 30 + the first end V2 of the line switching module 30 +, the second end V1 of the line switching module 30-the second end V2 of the line switching module 30-, the first end V1 of the line switching module 30 + further the third end V + of the line switching module 30, and the second end V2 of the line switching module 30-the fourth end V of the line switching module 30, so as to refer to fig. 8, the power module 10 is in the parallel connection state, and the discharge unit 211 is also in the parallel connection state. Referring to fig. 5 (b), the control module 40 may control the switch unit 31 to be in the second working state, such that the second end V1 of the circuit switching module 30 is connected to the first end V2 of the circuit switching module 30 +, the first end V1+ of the circuit switching module 30 is further connected to the third end V + of the circuit switching module 30, the second end V2 of the circuit switching module 30 is connected to the fourth end V-of the circuit switching module 30, and thus, referring to fig. 9, the power module 10 is in the series connection state, and the discharging unit 211 is also in the series connection state.

In addition, in the present embodiment, the first switch 21 is configured to turn on or off according to a signal of the control module 40, so as to enable the discharge unit 22 to be connected between the third terminal N3 of the corresponding power module 20 and the fourth terminal N4 of the corresponding power module 20, or to enable the discharge unit 22 not to be connected between the third terminal N3 of the corresponding power module 20 and the fourth terminal N4 of the corresponding power module 20. It can be seen that by setting the first switch 21, whether the discharge unit 22 is connected to the circuit can be flexibly controlled.

In some embodiments, referring to fig. 2, each power module 20 further includes a diode D20, wherein an anode of the diode D20 is connected to the first end N1 of the corresponding power module 20, and a cathode of the diode D20 is connected to the second end N2 of the corresponding power module 20, and by providing the diode D20, referring to fig. 8 and 9, current can be prevented from flowing back to the power module 10 when the battery module 200 is discharged through the discharging unit 22, so as to improve the working reliability of the maintenance device.

In some of these embodiments, the maintenance device further comprises a sampling unit; the sampling unit is arranged in the charging loop and the discharging loop and is also connected with the control module; the control module is used for acquiring current sampling signals through the sampling unit and controlling voltage signals output to each power supply module or each power module according to the current sampling signals.

Specifically, the sampling unit may include sampling resistors, and referring to fig. 2, the sampling unit includes at least two first sampling resistors R10 and at least two second sampling resistors R20, where the first sampling resistors R10 are connected between the first end of the corresponding power module 10 and the first end N1 of the power module 20, and the second sampling resistors R20 are connected between the corresponding first switch 21 and the fourth end N4 of the corresponding power module 20.

Thus, when each power module 10 charges the battery module 200, the control module 40 may obtain the charging current sampling signal of the corresponding power module 10 through the two ends of the first sampling resistor R10, and control the corresponding power module 10 according to the charging current sampling signal, so as to control the charging current of the battery module 200. And when the battery module 200 discharges through the discharge unit 22, the control module 40 may obtain the discharge current sampling signal of the corresponding discharge unit 22 through two ends of the second sampling resistor R20, and control the discharge unit 22 according to the discharge current sampling signal to control the discharge current of the battery module 200.

In this embodiment, the charging current or the discharging current is sampled by the sampling resistor, the current in the charging and discharging process can be monitored in real time, and the charging and discharging current can be adjusted by the current sampling signal subsequently, so that the charging and discharging current meets the charging and discharging conditions.

In some embodiments, referring to fig. 9, the control module 40 includes an amplifying unit 41 and a feedback operational amplifier unit 42. The input end of the amplifying unit 41 is used for accessing the current sampling signal, the output end of the amplifying unit 41 is connected to the first input end of the feedback operational amplifying unit 42, and the amplifying unit 41 is used for amplifying the current sampling signal. A second input end of the feedback operational amplifier unit 42 is used for accessing a voltage reference value, and an output end of the feedback operational amplifier unit 42 is connected with the power supply module, or an output end of the feedback operational amplifier unit 42 is connected with the first switch 21. In this embodiment, the feedback operational amplifier unit 42 may be configured to output a constant current control signal to the power module or the first switch according to the voltage reference value and the amplified current sampling signal, so as to adjust the charging current or the discharging current.

Referring to fig. 11, the first switch 21 may adopt an NMOS transistor Q1, and when the battery module 200 discharges through the discharging unit 22, the constant current control signal Vo is output to the NMOS transistor Q1 to adjust the gate-source voltage of the NMOS transistor Q1, so as to control the current flowing through the NMOS transistor Q1, i.e., the discharging current. The power module 10 may adopt a constant voltage source, and the magnitude of the current output by the power module 10, that is, the magnitude of the charging current, may be controlled by outputting the constant current control signal Vo to the control terminal of the constant voltage source.

In addition, referring to fig. 8, the amplifying unit 41 may include a first operational amplifier U1, a first resistor R1, and a second resistor R2, and the feedback operational amplifier unit 42 may include a second operational amplifier U2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, and a capacitor C2, wherein a non-inverting input terminal of the first operational amplifier U1 is connected to a first terminal of the sampling resistor Re, an inverting input terminal of the first operational amplifier U1 is connected to the first terminal of the first resistor R1 and the first terminal of the second resistor R2, a second terminal of the second resistor R2 is further connected to a second terminal of the sampling resistor Re, a second terminal of the first resistor R1 is connected to an inverting input terminal of the second operational amplifier U2 through the third resistor R3, an inverting input terminal of the second operational amplifier U2 is further connected to the first terminal of the capacitor C2 and the first terminal of the fifth resistor R5, a second terminal of the fifth resistor R5 is connected to a first terminal of the fourth resistor R4, a second terminal of the fourth resistor R4 is used for connecting to a second terminal of the non-inverting input terminal of the constant current operational amplifier U2, and a second terminal of the second operational amplifier U2, and a reference value of the constant current output of the second operational amplifier Vo control circuit. The sampling resistor Re is a first sampling resistor R10 or a second sampling resistor R20, and the voltage reference value Vi can be output by the micro control unit 44.

In the above circuit, when the circuit is stabilized, the relationship between the voltage reference value Vi and the current I flowing through the sampling resistor Re is as shown in the following equation (1), and then the current I is a function of the voltage reference value Vi as shown in equation (2).

In this embodiment, during charging or discharging, the control module 40 may adjust the voltage reference value Vi, and output the constant current control signal Vo to the power module 10 or the first switch 21 after feeding back the operational amplifier unit 42, so as to adjust the charging current or the discharging current, so that the charging current or the discharging current reaches the target current, which may reduce the complexity of controlling the charging and discharging current, and improve the application scenario. Furthermore, in the present embodiment, the charging and discharging current is controlled by the special amplifying unit 41 and the feedback operational amplifying unit 42, so that the response speed of the current control, that is, the control efficiency, and the accuracy of the current control can be improved. It should be noted that, in the above circuit, the reference ground G is the negative electrode of the power module 10 at the time of charging, and the reference ground G is the negative electrode of the battery module at the time of discharging. In the series connection state, the control signal reference ground of each power supply module 10 is different, and the control signal reference ground of each first switch 21 is different.

In some embodiments, with continued reference to fig. 10, the control module 40 further includes a voltage follower 43 and an RC filter unit 44, a first terminal of the RC filter unit 44 is used for receiving the voltage reference value Vi, a second terminal of the RC filter unit 44 is connected to an input terminal of the voltage follower 43, and an output terminal of the voltage follower 43 is connected to a first input terminal of the feedback op-amp unit 42. In this embodiment, the voltage reference value Vi may be a level signal or a PWM duty signal. In case of a PWM duty signal, the RC filtering unit 44 and the voltage follower 43 may convert the PWM signal into a level signal whose voltage reference value Vi has a magnitude of an average value of the PWM signal. In the embodiment, the RC filtering unit 44 is arranged to improve the anti-interference performance of the circuit, and the voltage follower 43 is arranged to ensure the accuracy of inputting the voltage reference value Vi to the feedback operational amplifier unit 42.

In some embodiments, referring to fig. 10, the control module 40 further includes a zener diode ZD1. The zener diode ZD1 is connected between the output terminal of the feedback operational amplifier unit 42 and ground. By providing the zener diode ZD1, it can be ensured that the output voltage Vo does not exceed the voltage threshold of the zener diode ZD1. Through type selection, the voltage threshold can be set to be the highest control voltage of the power module 10 or the maximum control voltage of the gate-source voltage of the NMOS transistor Q1, so that the working reliability of the circuit is ensured.

In some of these embodiments, the discharge unit includes at least one second switch and at least one resistor; the second switches are in one-to-one correspondence with the resistors and are connected in parallel, the second switches are further connected with the control module, and the control module is further used for acquiring discharge parameters and controlling the working state of the second switches according to the discharge parameters.

Specifically, referring to fig. 11, the at least one second switch includes a second switch K1, a second switch K2, and a second switch K3, the at least one resistor includes a resistor R221, a resistor R222, and a resistor R223, the second switch K1, the second switch K2, and the first switch 21 are sequentially connected in series between the third end of the corresponding power module and the fourth end of the corresponding power module, the resistor R221 is connected in parallel with the second switch K1, the resistor R222 is connected in parallel with the second switch K2, and the resistor R223 is connected in parallel with the second switch K3.

Therefore, in the embodiment, the resistance connected to the discharge loop can be adjusted by controlling the on/off of the second switch, so that the discharge current can be adjusted in the discharge process, and thus, in the discharge process, when the voltage of the battery in the battery module is gradually reduced, the resistance connected to the discharge loop can be adjusted by controlling the second switch, so that the discharge current is kept constant, and the discharge condition is met.

In some embodiments, to improve the flexibility of the discharge unit 22, the resistances of the resistors in the discharge unit 22 are unequal, the combined minimum resistance can support the highest current at the lowest cell voltage, and the combined maximum resistance can support the lowest current at the highest cell voltage.

In some embodiments, referring to fig. 1, the maintenance apparatus further includes a sampling module 60, the control module 40 is connected to the battery module 200 through the sampling module 60, and the control module 40 can sample the battery module 200 through the sampling module 60.

Specifically, in order to avoid increasing the interface of the host, in some embodiments, please refer to fig. 2, the control module 40 further includes an internal sampling interface 46 and an external sampling interface 47, and the sampling module includes an internal sampling unit 61 and an external sampling unit 62. The micro control unit 44 is connected with the internal sampling interface 46 through the internal sampling unit 61, the internal sampling interface 46 is also used for being in communication connection with the battery module 200, the micro control unit 44 is also in communication connection with the external sampling unit 62 through the external sampling interface 47, and the external sampling unit 62 is used for being in communication connection with the battery module 200. The internal sampling interface is an analog sampling interface, and the external sampling interface is a digital sampling interface.

The external sampling unit 62 is also in communication connection with the battery module 200, so that the control module 40 can sample the voltage and the temperature of the battery module 200 through the internal sampling unit 61 and the external sampling unit 62. Like this, when battery module 10 electric core quantity is less, promptly when battery module 10 voltage is less, little the control unit 44 can directly sample through built-in sampling unit 61, when battery module 10 electric core quantity is more, promptly when battery module 10 voltage is less, little the control unit 44 can sample through built-in sampling unit 61 and external sampling unit 62 simultaneously, it is thus clear, in this embodiment, little the control channel demand that different voltages were solved to control unit 44 accessible built-in sampling unit 61 and external sampling unit 62, connect external sampling unit 62 through setting up external sampling interface 47, can extend the sampling channel of control module 40, with the control demand of satisfying the most battery module, and can reduce little the cost of control unit 44.

In some of these embodiments, the maintenance device further comprises a housing and an interaction module. One side of the interaction module is arranged on the surface of the shell, each power module, the circuit switching module and the control module are arranged in the shell, and the interaction module is connected with the control module.

Specifically, referring to fig. 2, the interactive module 50 is in communication connection with the micro control unit 44, the interactive module 50 may include a display screen, a touch screen, a communication unit, a storage unit, a processing unit, and the like, wherein the display screen and the touch screen may be disposed on the surface of the housing, and the interactive module 50 may be used to implement human-computer interaction management.

For maintenance, in some embodiments, the line switching module may be disposed on an inner surface of the housing. Through the arrangement, the circuit switching module is favorably maintained, such as fuse replacement, circuit switching and the like.

In some of these embodiments, the power module further comprises a heat sink. The heat dissipation device is used for discharging when the discharge unit works. The heat sink may be a fan, a refrigerator, or the like. Through setting up heat abstractor, can reduce the temperature of the unit during operation maintenance equipment of discharging, avoid maintaining the too high temperature of equipment, improve the security of maintaining equipment work.

In a second aspect, an embodiment of the present invention further provides a charging and discharging method, which is applied to the maintenance device according to any one of the first aspect, where the method includes:

step S1: acquiring the current voltage and the target voltage of the battery module;

step S2: and controlling the line switching of the maintenance equipment according to the current voltage and the target voltage to generate a charging loop or a discharging loop, wherein the charging loop is used for charging the battery module, and the discharging loop is used for discharging the battery module.

Specifically, the charge and discharge parameters include a target voltage, and it is understood that the line switching should be completed before the battery module 200 is charged and discharged to ensure the safety of the charge and discharge process. The method provided by the embodiment of the present invention may be executed by the micro control unit 44 in the maintenance device or by a controller outside the maintenance device, and the following explanation is given as an example for the execution of the control unit 44, and is not limited in practical application.

The mcu 44 can communicate with the battery module 200, obtain the current voltage of the battery module 200, and obtain the target voltage of the battery module 200 during the charging process or the discharging process. If the current voltage and the target voltage are lower than the voltage threshold in the parallel connection state, the mcu 44 controls the line switching module 30 to be in the first operating state, such that the connection state between the power modules 10 is in the parallel connection state, and the connection state between the power modules 20 is in the parallel connection state. Here, the voltage threshold in the parallel connection state when the battery module 200 is charged is the highest voltage threshold output by each power module 10 in the parallel connection state, and the voltage threshold in the parallel connection state when the battery module 200 is discharged is the highest voltage threshold output by each power module 10 in the parallel connection state.

And if any one of the current voltage and the target voltage is higher than the voltage threshold value in the parallel connection state, judging whether the voltage threshold value in the series connection state is larger than or equal to the target voltage. If yes, the micro control unit 44 controls the line switching module 30 to be in the second working state, so that the connection state between the power modules 10 is in the series connection state, and the connection state between the power modules 20 is in the series connection state; if not, sending prompt information to prompt a user that the voltage is not in the working range of the maintenance equipment and the related operation cannot be carried out. The voltage threshold in the series connection state when the battery module 200 is charged is the highest voltage threshold output by each power module 10 when it is connected in series, and the voltage threshold in the series connection state when the battery module 200 is discharged is the highest voltage threshold output by each power module 10 when it is connected in series.

It can be seen that, in this embodiment, whether the parallel connection state or the serial connection state is adopted according to the target voltage and the current battery voltage may be analyzed, and the line in the maintenance equipment may be controlled to be switched, for example, the working state of the line switching module 30 is determined, so as to provide a charging loop or a discharging loop for the battery module 200, and meet the charging and discharging parameters of the battery module 200. And when the voltage is not within the working range of the maintenance device, the voltage can be fed back to the user, and the working state of the line switching module 30 can be determined through the charge and discharge parameters of the battery module 200.

In some embodiments, the discharge circuit includes a first switch and a discharge unit, the discharge unit includes at least one resistor, and the charge and discharge method further includes:

and step S3: and acquiring the discharge voltage required to be borne by the discharge unit, the discharge current required by the battery module, the resistance value set of each resistor and the maximum allowable power of the first switch.

Specifically, referring to fig. 11, after determining the discharging process, the control module 40 obtains the discharging voltage Vc that the discharging unit 22 needs to bear, the discharging current Id that the battery module 200 needs, the resistance set S = { R221, R222, R223} of the resistors in the discharging unit 22, and the maximum allowable power Pmax of the NMOS transistor Q1.

And step S4: obtaining a resistance value required by discharging according to the discharging voltage and the discharging current;

specifically, the resistance R required for discharge is calculated by the following formula:

R＝Vc/Id。

step S5: and determining a discharge resistor which needs to be connected into the discharge loop according to the resistance value required for discharging and the resistance value set, and controlling the discharge resistor to be connected into the discharge loop, wherein after the discharge resistor is connected into the discharge loop, the distributed power of the first switch is less than or equal to the maximum allowable power.

Specifically, the resistance required by specific discharge is searched in the resistance set SThe maximum resistance value combination with small value R is calculated according to the formula (3) _R Then, the distributed power P on the NMOS tube Q1 is calculated according to the formula (4) _Mos (ii) a If the distributed power on the NMOS tube Q1 is smaller than Pmax, the resistor to be connected is the maximum resistor resistance combination; if the distributed power on the NMOS tube Q1 is larger than Pmax, then the distributed power on the NMOS tube Q1 is larger than Pmax, the minimum resistance value combination which is larger than the resistance value R required by discharging is continuously searched in the resistance value set S, the distributed power on the discharging unit and the NMOS tube Q1 is calculated again according to the following formula, if the distributed power on the NMOS tube Q1 is smaller than Pmax, the discharging resistor is the minimum resistance value combination, if the distributed power on the NMOS tube Q1 is larger than Pmax, then the minimum resistance value set which is larger than the resistance value combination is searched again until all resistors are used.

P _Mos ＝I·V _c -P _R (4)。

Finally, according to the selected discharge resistor, the discharge resistor is controlled to be connected into the discharge loop, for example, the second switch corresponding to the discharge resistor can be controlled to be switched off, so that the discharge resistor can be connected into the discharge loop.

Therefore, in the embodiment, the connected discharge resistor can be flexibly determined by the method so as to adjust the magnitude of the discharge current.

It should be noted that the above-described embodiments of the apparatus are merely illustrative, where the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The maintenance equipment of the battery module is characterized by comprising at least two power modules, a line switching module and a control module;

the input end of the power supply module is used for connecting an alternating current power supply, the at least two power supply modules correspond to the at least two power modules one by one, the first output end of the power supply module is connected with the first end of the power module through the control module, the second output end of the power supply module is connected with the second end of the power module through the control module, and the power supply module is used for converting the alternating current into direct current;

the circuit switching module is provided with at least two first ends and at least two second ends, the third end of each power module corresponds to each first end of the circuit switching module one by one, the fourth end of each power module corresponds to each second end of the circuit switching module one by one, in each power module, the third end of each power module is respectively connected with the first end of each power module and the first end of the circuit switching module, the fourth end of each power module is respectively connected with the second end of each power module and the second end of the circuit switching module, the third end of each circuit switching module is used for being connected with the first end of the battery module, and the fourth end of each circuit switching module is used for being connected with the second end of the battery module;

the control module is also respectively connected with the battery module, the circuit switching module, each power supply module and each power module, and is used for controlling the working state of the circuit switching module according to the charge and discharge parameters of the battery module;

the circuit switching module is used for switching the connection state among the power modules and generating a charging circuit and switching the connection state among the power modules and generating a discharging circuit under different working states.

2. The maintenance device according to claim 1, wherein each of the power modules includes a first switch and a discharge unit;

in each power module, the first switch and the discharge unit are connected in series between a third terminal of the power module and a fourth terminal of the power module, and the first switch is further connected with the control module.

3. The maintenance device according to claim 2, characterized in that the maintenance device further comprises a sampling unit;

the sampling unit is arranged in the charging loop and the discharging loop and is also connected with the control module;

the control module is used for acquiring current sampling signals through the sampling unit and controlling voltage signals output to the power modules or the power modules according to the current sampling signals.

4. The maintenance device of claim 3, wherein the control module comprises an amplification unit and a feedback operational amplifier unit;

the input end of the amplifying unit is used for accessing the current sampling signal, the output end of the amplifying unit is connected with the first input end of the feedback operational amplifying unit, and the amplifying unit is used for amplifying the current sampling signal;

the second input end of the feedback operational amplifier unit is used for being connected with a voltage reference value, and the output end of the feedback operational amplifier unit is connected with the power module, or the output end of the feedback operational amplifier unit is connected with the first switch.

5. The maintenance device of claim 4, wherein the control module further comprises a zener diode;

the voltage stabilizing diode is connected between the output end of the feedback operational amplifier unit and the ground.

6. The maintenance device according to any one of claims 2 to 5, wherein the discharge unit comprises at least one second switch and at least one resistor;

the second switches are in one-to-one correspondence with the resistors and are connected in parallel with the resistors, the second switches are further connected with the control module, and the control module is further used for acquiring discharge parameters and controlling the working state of the second switches according to the discharge parameters.

7. The maintenance device according to claim 6, wherein the control module further comprises a micro control unit, an internal sampling interface, and an external sampling interface, and the maintenance device further comprises an internal sampling unit and an external sampling unit;

the micro control unit is connected with the internal sampling interface through the internal sampling unit, the internal sampling interface is also used for being in communication connection with the battery module, the micro control unit is in communication connection with the external sampling unit through the external sampling interface, and the external sampling unit is also used for being in communication connection with the battery module;

the internal sampling interface is an analog sampling interface, and the external sampling interface is a digital sampling interface.

8. The maintenance device of claim 1, further comprising a housing and an interaction module;

one side of the interaction module is arranged on the surface of the shell, each power supply module, each power module, the circuit switching module and the control module are arranged in the shell, and the interaction module is connected with the control module.

9. A charging and discharging method applied to the maintenance apparatus according to any one of claims 1 to 8, characterized in that the method comprises:

acquiring the current voltage and the target voltage of the battery module;

and controlling the line switching of the maintenance equipment according to the current voltage and the target voltage to generate a charging loop or a discharging loop, wherein the charging loop is used for charging the battery module, and the discharging loop is used for discharging the battery module.

10. The charging and discharging method according to claim 9, wherein the discharging circuit comprises a first switch and a discharging unit, the discharging unit comprises at least one resistor, the charging and discharging method further comprises:

acquiring a discharge voltage required to be borne by the discharge unit, a discharge current required by the battery module, a resistance value set of each resistor and the maximum allowable power of the first switch;

obtaining a resistance value required by discharging according to the discharging voltage and the discharging current;

and determining a discharge resistor needing to be connected into a discharge loop according to the resistance value required for discharge and the resistance value set, and controlling the discharge resistor to be connected into the discharge loop, wherein after the discharge resistor is connected into the discharge loop, the distribution power of the first switch is less than or equal to the maximum allowable power.