WO2018209786A1 - Système et procédé de charge de bloc-batterie - Google Patents

Système et procédé de charge de bloc-batterie Download PDF

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Publication number
WO2018209786A1
WO2018209786A1 PCT/CN2017/093372 CN2017093372W WO2018209786A1 WO 2018209786 A1 WO2018209786 A1 WO 2018209786A1 CN 2017093372 W CN2017093372 W CN 2017093372W WO 2018209786 A1 WO2018209786 A1 WO 2018209786A1
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WIPO (PCT)
Prior art keywords
charging
switching device
branch
power source
battery pack
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PCT/CN2017/093372
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English (en)
Chinese (zh)
Inventor
蔡世明
张凯
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宁德时代新能源科技股份有限公司
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Publication of WO2018209786A1 publication Critical patent/WO2018209786A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit

Definitions

  • the present invention relates to the field of power batteries, and more particularly to a battery pack charging system and method.
  • battery packs are used as power sources in various fields.
  • the battery pack is generally recyclable and recyclable so that it can be recycled.
  • a battery pack with a larger capacity is generally composed of a plurality of branches in parallel, and each branch needs to be charged.
  • the total current of the battery pack charging circuit is the sum of the charging currents of the plurality of branches. In other words, the total charging current of the battery pack charging circuit is also large.
  • an overcurrent device will be provided. When the charging current is too large during charging, or when overcharging occurs, the overcurrent device disconnects the battery pack from the charging power source.
  • the normal total charging current is also large.
  • the total charging current of the battery pack with a large capacity for rapid charging can reach 1000A.
  • Embodiments of the present invention provide a battery pack charging system and method, which can ensure that a battery pack with a large charging current is normally charged.
  • an embodiment of the present invention provides a battery pack charging system including N charging branches sequentially arranged between a positive pole of a charging power source and a negative pole of a charging power source, where N is an integer greater than or equal to 2;
  • the input end of the charging branch is connected to the positive pole of the charging power source, and the output end of the first charging branch is connected to the negative pole of the charging power source through the first switching device; except for the first charging branch and the Nth charging branch
  • the input terminals of the remaining remaining charging branches pass through the second switching device Connected to the positive pole of the charging power supply, the output end of the remaining charging branch is connected to the negative pole of the charging power source through the third switching device;
  • the input end of the Nth charging branch is connected with the positive pole of the charging power source through the fourth switching device, the Nth
  • the output end of the charging branch is connected to the negative pole of the charging power source;
  • the output end of the i-th charging branch is connected to the input end of the i+1th charging branch through the fifth switching
  • an embodiment of the present invention provides a battery pack charging method, which is used in the battery pack charging system in the above embodiment, the method includes: detecting whether the battery assembly is in a charging state; and if the battery assembly is in a charging state, The input end of the charging branch of the first charging is connected to the positive pole of the charging power source, the output end of the Nth charging branch is connected to the negative pole of the charging power source, the fifth switching device is closed, and the switching devices except the fifth switching device are disconnect.
  • Embodiments of the present invention provide a battery pack charging system and method, the system including N charging branches arranged in sequence.
  • the input end of the first charging branch is connected to the positive pole of the charging power source, and the output end of the first charging branch is connected to the negative pole of the charging power source through the first switching device.
  • the input end and the output end of the remaining charging branch except the first charging branch and the Nth charging branch are respectively connected to the positive pole and the negative pole of the charging power source through the second switching device and the third switching device.
  • the input end of the Nth charging branch is connected to the positive pole of the charging power source through the fourth switching device, and the output end of the Nth charging branch is connected to the negative pole of the charging power source.
  • the output end of the i-th charging branch is connected to the input end of the i+1th charging branch through the fifth switching device.
  • the N charging branches are connected in series when the battery assembly is in a charged state, reducing the total charging current of the battery pack charging circuit. Therefore, with an overcurrent device that supports a small charging current, it is also possible to ensure that the battery pack with a large charging current is normally charged.
  • FIG. 1 is a schematic structural view of a battery pack charging system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of another battery pack charging system according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a battery pack charging system in an example of an embodiment of the present invention.
  • FIG. 4 is a flow chart of a battery pack charging method according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a battery pack charging method according to another embodiment of the present invention.
  • FIG. 6 is a flow chart of a battery pack charging method according to still another embodiment of the present invention.
  • Embodiments of the present invention provide a battery pack charging system and method, which can utilize an existing overcurrent device supporting a small charging current to ensure that a battery pack having a large charging current can be normally charged.
  • the switching device can be disposed at a connection between the charging branch of the battery pack and the anode of the charging power source, the cathode of the charging power source, and the charging branches.
  • multiple charging branches are routed in parallel and converted into series. Thereby reducing the total charging current in the battery pack charging circuit, and avoiding the use of an overcurrent device supporting a smaller charging current to affect the normal charging of the battery pack.
  • charging the battery pack is equivalent to charging the battery assembly in the battery pack charging system.
  • the battery pack charging system in the embodiment of the present invention includes N charging branches sequentially arranged between the positive pole of the charging power source and the negative pole of the charging power source, and N is an integer greater than or equal to 2.
  • FIG. 1 is a schematic structural diagram of a battery pack charging system 10 according to an embodiment of the present invention.
  • FIG. 1 there are three charging branches between the positive pole of the charging power source and the negative pole of the charging power source, which are B1, B2 and B3, respectively. Can also be used at the convergence point of 3 charging branches and charging power
  • a switching device K6 is provided between the positive electrodes, and a switching device K7 is provided between the convergence points of the three charging branches and the negative terminal of the charging power source. It is possible to control whether or not charging is performed by controlling the opening and closing states of the switching devices K6 and K7. When the switching devices K6 and K7 are closed, charging is performed. When at least one of the switching devices K6 and K7 is turned off, charging is stopped.
  • the input end of the first charging branch B1 is connected to the positive pole of the charging power source, and the output end of the first charging branch B1 is connected to the cathode of the charging power source via the first switching device K1.
  • the input end of the second charging branch B2 is connected to the positive pole of the charging power source via the second switching device K2, and the output end of the second charging branch B2 is connected to the negative pole of the charging power source via the third switching device K3.
  • the input end of the third charging branch B3 is connected to the positive pole of the charging power source via the fourth switching device K4, and the output end of the third charging branch B3 is connected to the negative pole of the charging power source.
  • the output of any one of the charging branches is connected to the input of the next charging branch via the fifth switching device K5. That is to say, the output end of the ith charging branch and the input end of the i+1th charging branch are connected by the fifth switching device K3, i is an integer and 1 ⁇ i ⁇ N.
  • the output end of the first charging branch B1 and the input end of the second charging branch B2 are connected by the fifth switching device K5, and the output end of the second charging branch B2 and the third charging branch B3 The input is connected via a fifth switching device K5.
  • Each of the above charging branches includes at least one battery assembly.
  • the battery assembly can concentrate or discharge power.
  • the accumulated power is the charge, and the discharge is the discharge.
  • each charging branch includes two battery assemblies.
  • the input end of the first charging branch B1 can be connected to the positive terminal of the charging power source, the first switching device K1 can be disconnected, and the second switching device K2 can be disconnected.
  • the fifth switching device K5 can be closed.
  • the three branches in the battery pack charging system are connected in series, and the total charging current in the battery charging circuit through the three branches after the series is much smaller than the three branches through the parallel connection. The total charging current in the battery pack charging loop.
  • the overcurrent device in the battery charging circuit can support the total charging current of 600A.
  • the three charging branches are connected in series, and the total charging current of the battery charging circuit is 300A, in the overcurrent.
  • the range of total charge currents that the device can support allows the battery assembly in the battery pack to be properly charged.
  • the input terminals of the remaining charging branches except the first charging branch and the Nth charging branch pass through the second
  • the switching device is connected to the positive pole of the charging power source, and the output ends of the remaining charging branches are connected to the negative pole of the charging power source through the third switching device.
  • FIG. 2 is a schematic structural diagram of another battery pack charging system according to an embodiment of the present invention.
  • the battery pack charging system includes four charging branches, namely D1, D2, D3 and D4. It is also possible to provide a switching device K6 between the convergence point of the four charging branches and the positive terminal of the charging power source, and a switching device K7 is provided between the convergence point of the four charging branches and the negative terminal of the charging power source. Whether or not charging is performed can be controlled by controlling the opening and closing states of the switching devices K6 and K7. When the switching devices K6 and K7 are closed, charging is performed. When at least one of the switching devices K6 and K7 is turned off, charging is stopped.
  • the input end of the first charging branch D1 is connected to the positive pole of the charging power source, and the output end of the first charging branch D1 is connected to the cathode of the charging power source via the first switching device K1.
  • the output end of the first charging branch D1 and the input end of the second charging branch are connected via a fifth switching device K5.
  • the input end of the second charging branch D2 is connected to the positive pole of the charging power source through the second switching device K2, and the output end of the second charging branch D2 is connected to the negative pole of the charging power source through the third switching device K3.
  • the output of the second charging branch D2 and the input of the third charging branch D3 are connected via a fifth switching device K5.
  • the input end of the third charging branch D3 is connected to the positive pole of the charging power source through the second switching device K2, and the output end of the third charging branch D3 is connected to the negative pole of the charging power source through the third switching device K3.
  • the output of the third charging branch D3 and the input of the fourth charging branch D4 are connected by a fifth switching device K5.
  • the input end of the fourth charging branch D4 is connected to the positive pole of the charging power source via the fourth switching device K4, and the output end of the fourth charging branch D4 is connected to the negative pole of the charging power source.
  • the number of the first switching device, the second switching device, the third switching device, the fourth switching device, and the fifth switching device in the above embodiment may be one or more, and is not limited.
  • the input end of the first charging branch can be directly connected to the positive pole of the charging power source, or can be connected through a switching device.
  • the output of the Nth charging branch can be directly connected to the negative pole of the charging power source or can be connected through a switching device.
  • the first charging branch is in communication with the positive pole of the charging power source, and the Nth charging branch is in communication with the negative pole of the charging power source.
  • Embodiments of the present invention provide a battery pack charging system including N charging branches arranged in sequence.
  • the input end of the first charging branch is connected to the positive pole of the charging power source, and the output end of the first charging branch is connected to the negative pole of the charging power source through the first switching device.
  • the input end and the output end of the remaining charging branch except the first charging branch and the Nth charging branch are respectively connected to the positive pole and the negative pole of the charging power source through the second switching device and the third switching device.
  • the input end of the Nth charging branch is connected to the positive pole of the charging power source through the fourth switching device, and the output end of the Nth charging branch is connected to the negative pole of the charging power source.
  • the output end of the i-th charging branch is connected to the input end of the i+1th charging branch through the fifth switching device.
  • the input end of the first charging branch can be connected to the positive terminal of the charging power source, and the first switching device can be closed to enable the second switch.
  • the device is closed, the third switching device can be closed, the fourth switching device can be closed, and the output end of the Nth charging branch can be connected to the negative terminal to disconnect the fifth switching device.
  • the order of opening or closing of the first switching device, the second switching device, the third switching device, the fourth switching device, and the fifth switching device may be set.
  • the fifth switching device can be turned off first, and then the first switching device, the second switching device, the third switching device, and the fourth switching device are both closed.
  • the N charging branches in the battery charging system are connected in parallel, and each charging branch in parallel can be Output power to the outside.
  • a mutually exclusive state can be formed.
  • any one of the first switching device, the second switching device, the third switching device, and the fourth switching device is in a closed state, and the fifth switching device is in an off state.
  • the fifth switching device is in a closed state, and the first switching device, the second switching device, the third switching device, and the fourth switching device are all in an off state. Therefore, the switching devices in the mutually exclusive state are prevented from being simultaneously closed, causing a short circuit in the charging circuit or the discharging circuit.
  • the battery pack charging system may further include a first adhesion detecting module and a first control module.
  • the first adhesion detecting module is configured to detect whether any one of the first switching device, the second switching device, the third switching device, and the fourth switching device is closed before charging the battery assembly.
  • the first control module is configured to disable charging of the battery assembly if any one of the first switching device, the second switching device, the third switching device, and the fourth switching device is closed.
  • any one of the first switching device K1, the second switching device K2, the third switching device K3, and the fourth switching device K4 is closed, the switching device K6 and / Or K7 is disconnected, and the battery assembly is prohibited from charging.
  • the fifth switching device is enabled. K5 is disconnected, thereby disabling the charging of the battery assembly.
  • the plurality of charging branches cannot be connected in series, which may affect the battery The group is charged normally.
  • the battery pack charging system may further include a second adhesion detection module and a second control module.
  • the second adhesion detecting module is configured to detect whether the fifth switching device is closed before the battery assembly is discharged.
  • the second control module is configured to inhibit the battery assembly from discharging if the fifth switching device is closed.
  • the plurality of charging branches are connected in series, which may cause a short circuit in the charging branch, thereby affecting the normal discharge of the battery pack.
  • the fifth switching device may be connected with a fuse. If the current passing between the i-th charging branch and the i+1th charging branch is too large, the fuse is blown.
  • the charging circuit can be disconnected in the event of an overcurrent or short circuit in the charging circuit, thereby protecting the battery pack charging system.
  • FIG. 3 is a schematic structural diagram of a battery pack charging system 10 in an example of an embodiment of the present invention. 3 is different from FIG. 1 in that the output end of the first charging branch B1 and the fifth switching device K5 can be connected by a fuse f1, and the output end of the second charging branch B2 and the fifth switching device K5 can be connected by fuse f2.
  • the fuse may be disposed between the input end of the charging branch and the fifth switching device.
  • the fifth switching device K5 and the input end of the second charging branch B2 are connected by a fuse
  • the fifth switching device K5 and the The input terminals of the three charging branches B3 are connected by a fuse.
  • the switching device (including the first switching device, the second switching device, the third switching device, the fourth switching device, and the fifth switching device) in the above embodiments includes a contactor, and may also be other switching devices having a switching function.
  • the contactor can be a relay. If the relay is installed in a high voltage circuit, the relay can be placed in a high voltage box.
  • the battery assembly may include a battery cell, a battery module, or a battery pack.
  • the battery assembly can be selected according to the working scenario. For example, if the battery pack charging system is used to charge the battery pack of the electric vehicle, the battery assembly can be a battery pack to provide more electric power for the electric vehicle.
  • the battery pack charging method includes steps 201-202.
  • step 201 it is detected whether the battery assembly is in a charged state.
  • step 202 if the battery assembly is in a charging state, the input end of the first charging branch is controlled to communicate with the positive terminal of the charging power source of the charging power source, and the output end of the Nth charging branch is connected to the negative terminal of the charging power source.
  • the fifth switching device is closed, and the switching devices other than the fifth switching device are turned off.
  • the input end of the first charging branch is controlled to communicate with the positive terminal of the charging power source.
  • the output end of the i-th charging branch is in communication with the input end of the i+1th charging branch.
  • the output end of the Nth charging branch is in communication with the negative terminal of the charging power source.
  • Embodiments of the present invention provide a battery pack charging method, which is applied to a battery pack charging system. If the battery assembly is in a charging state, controlling the input end of the first charging branch to communicate with the positive pole of the charging power source, the output end of the Nth charging branch is in communication with the negative pole of the charging power source, and the fifth switching device is closed, except the The switching devices other than the five-switch device are disconnected. Thereby all the charging branches in the battery pack charging system are connected in series, which reduces the total charging current of the battery pack charging circuit. Therefore, with an overcurrent device that supports a small charging current, it is also possible to ensure that the battery pack with a large charging current is normally charged.
  • FIG. 5 is a flowchart of a battery pack charging method according to another embodiment of the present invention. 5 is different from FIG. 4 in that the battery pack charging method shown in FIG. 5 further includes steps 203 to 204.
  • step 203 it is detected whether the battery assembly is in a discharged state.
  • whether the battery assembly is in a discharged state can be detected by detecting whether a discharge signal is present. If there is a discharge signal, the battery assembly is in a discharged state.
  • step 204 if the battery assembly is in a discharged state, the input end of the first charging branch is controlled to communicate with the positive terminal of the charging power source, and the output end of the Nth charging branch is connected to the negative terminal of the charging power source, and the fifth switch The device is turned off and the switching devices except the fifth switching device are closed.
  • the input terminals of all the charging branches are controlled to communicate with the positive pole of the charging power source, and the output ends of all the charging branches are connected with the negative pole of the charging power source.
  • One charging branch is disconnected from the next charging branch and is not conducting.
  • a plurality of charging branches are connected in parallel.
  • step 203 and step 204 may be performed after step 202, or may be performed before step 201, and the order of execution of step 203 and step 204 and other steps is not limited herein.
  • FIG. 6 is a flow chart of a battery pack charging method according to still another embodiment of the present invention. 6 is different from FIG. 5 in that the battery pack charging method shown in FIG. 6 may further include steps 205 to 208.
  • step 205 it is detected whether any one of the first switching device, the second switching device, the third switching device, and the fourth switching device is closed before the battery assembly is charged.
  • the switching device that may cause the charging branch to be connected in parallel is detected before the battery assembly is charged, that is, immediately before the battery assembly is charged. If it is possible to close any one of the switching devices in parallel with the charging branch, the battery assembly is prohibited from being charged, and the total charging current of the battery charging circuit is prevented from being excessively large, which affects the normal charging of the battery pack.
  • step 206 if any one of the first switching device, the second switching device, the third switching device, and the fourth switching device is closed, charging of the battery assembly is prohibited.
  • step 207 it is detected whether the fifth switching device is closed before the battery assembly is discharged.
  • the switching device that may cause the charging branch to be connected is closed before the battery assembly is discharged, that is, immediately before the battery assembly is discharged. If it is possible to close the switching device in series with the charging branch, the battery assembly is prohibited from being discharged to avoid affecting the normal discharge of the battery pack.
  • step 208 if the fifth switching device is closed, the battery assembly is inhibited from discharging.
  • the functional modules (such as the first adhesion detection module, the first control module, the second adhesion detection module, and the second control module) in the above embodiments may be implemented as hardware, software, firmware, or a combination thereof.
  • it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, plug-ins, function cards, and the like.
  • ASIC application specific integrated circuit
  • the elements of the present invention are programs or code segments that are used to perform the required tasks. Program or code segment can It is stored in a machine readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave.
  • a "machine-readable medium” can include any medium that can store or transfer information.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne un système et un procédé de charge de bloc-batterie, se rapportant au domaine des batteries d'alimentation. Le système de charge de bloc-batterie comprend N branches de charge disposées séquentiellement entre une électrode positive et une électrode négative d'une alimentation électrique de charge. Une première branche de charge (B1) est connectée à l'électrode positive de l'alimentation électrique de charge et elle est connectée à l'électrode négative de l'alimentation électrique de charge au moyen d'un premier dispositif de commutation (K1). Les branches de charge restantes, autres que la première branche de charge (B1) et une Nième branche de charge, sont toutes connectées à l'électrode positive de l'alimentation électrique de charge au moyen d'un deuxième dispositif de commutation (K2). Les branches de charge restantes sont toutes connectées à l'électrode négative de l'alimentation électrique de charge au moyen d'un troisième dispositif de commutation (K3). La Nième branche de charge est connectée à l'électrode négative de l'alimentation électrique de charge et elle est connectée à l'électrode positive de l'alimentation électrique de charge au moyen d'un quatrième dispositif de commutation (K4). Une extrémité de sortie d'une ième branche de charge est connectée à une extrémité d'entrée d'une (i+1)ème branche de charge au moyen d'un cinquième dispositif de commutation (K5). Des ensembles de batteries dans les branches de charge se trouvent dans un état de charge. La première branche de charge (B1) est en communication avec l'électrode positive de l'alimentation électrique de charge, la Nième branche de charge est en communication avec l'électrode négative, le cinquième dispositif de commutation (K5) est fermé et les dispositifs de commutation, autres que le cinquième dispositif de commutation (K5), sont tous ouverts. Le système et le procédé de charge de bloc-batterie peuvent assurer la charge normale d'un bloc-batterie avec un courant de charge plus élevé.
PCT/CN2017/093372 2017-05-19 2017-07-18 Système et procédé de charge de bloc-batterie WO2018209786A1 (fr)

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