CN211720290U

CN211720290U - Circuit structure of battery access node in serial charge-discharge loop

Info

Publication number: CN211720290U
Application number: CN202020437047.5U
Authority: CN
Inventors: 彭正雄; 李震; 潘龙; 徐利东
Original assignee: JIANGSU JINFAN POWER TECHNOLOGY CO LTD
Current assignee: JIANGSU JINFAN POWER TECHNOLOGY CO LTD
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-10-20
Anticipated expiration: 2030-03-30

Abstract

The utility model discloses a withdraw or insert the battery and can not break off the circuit structure of battery access node in the serial-type charge-discharge circuit in charge-discharge circuit, include: the charging and discharging system comprises two charging and discharging access ends, wherein one charging and discharging access end is directly used as a battery access end, the other charging and discharging access end is connected with the other battery access end through a charging and discharging on-off switch circuit, two ends of the charging and discharging on-off switch circuit are connected in parallel with a charging follow current circuit, and a charging and discharging bypass switch circuit and a discharging follow current circuit are connected between the two charging and discharging access ends in parallel. Adopted the charge-discharge circuit of structure battery access node can be widely applied to a plurality of occasions such as battery manufacturing, use and detection, is particularly useful for the occasion of the manufacturing, use and the detection of lithium cell.

Description

Circuit structure of battery access node in serial charge-discharge loop

Technical Field

The utility model relates to a serial-type charge-discharge circuit, concretely relates to circuit structure of battery access node in serial-type charge-discharge circuit.

Background

Before the storage battery leaves a factory, the capacity and the performance of the battery need to be tested, and batteries with similar capacity are matched and sold. At present, most of storage battery production enterprises adopt the storage battery to be connected in series to carry out constant current or constant voltage charge and discharge in groups, all the accessed batteries are charged and discharged simultaneously, and each battery can not be charged to the same voltage according to the difference of the performance of each battery in the battery pack, so that some batteries are not charged enough, some batteries are overcharged, and after a plurality of charge and discharge cycles, the performance difference of each battery in the battery pack is more obvious, and finally the whole group of batteries is scrapped. Therefore, the above-mentioned charging manner greatly reduces the service life of the battery pack. When the battery pack is assembled, the voltage of the charged or discharged storage battery needs to be manually measured, the battery is assembled according to the voltage of the battery, if one battery in the battery pack is found to have a problem in the charging and discharging process, the battery with the problem needs to be manually removed after the charging and discharging process is suspended, and the charging and discharging process is restarted, so that the labor intensity of operators is increased, and the assembly is not accurate enough due to the large error generated by manual measurement, and the service life of the storage battery is further influenced. In addition, since the lithium battery cannot be overcharged or overdischarged at all, the performance of the lithium battery is greatly affected and even the lithium battery is scrapped once the lithium battery is overcharged or overdischarged. Therefore, the conventional series charging and discharging device cannot be used for charging and discharging the lithium battery. At present, each battery is charged and discharged independently, namely single-point charging and discharging, and as is known, the single-point charging and discharging circuit is complex, so that the occupied area is large, and the cost of the single-point charging equipment is high.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: a circuit structure of a battery access node in a series-connection type charge-discharge loop is provided, wherein the charge-discharge loop can not be disconnected when a battery is removed or accessed.

For solving the technical problem, the utility model discloses the technical scheme who adopts does: a circuit structure of a battery access node in a series charging and discharging loop comprises: the charging and discharging system comprises two charging and discharging access ends, wherein one charging and discharging access end is directly used as a battery access end, the other charging and discharging access end is connected with the other battery access end through a charging and discharging on-off switch circuit, two ends of the charging and discharging on-off switch circuit are connected in parallel with a charging follow current circuit, and a charging and discharging bypass switch circuit and a discharging follow current circuit are connected between the two charging and discharging access ends in parallel.

As a preferable scheme, in the circuit structure of the battery access node in the series charging and discharging circuit, the charging freewheel circuit and the discharging freewheel circuit are both one-way conduction devices.

As a preferable scheme, in the circuit structure of the battery access node in the series charging and discharging loop, the one-way conduction device is a diode.

As a preferable scheme, in the circuit structure of the battery access node in the series-connection type charge-discharge loop, the charge-discharge on-off switch circuit and the charge-discharge bypass switch circuit are a group of normally open contacts in a relay or a contactor.

As a preferable scheme, in the circuit structure of the battery access node in the series-connection type charge-discharge loop, the charge-discharge on-off switch circuit and the charge-discharge bypass switch circuit adopt a single-pole double-throw switch.

As a preferable scheme, in the circuit structure of the battery access node in the series-connection type charge-discharge loop, the charge-discharge on-off switch circuit and the charge-discharge bypass switch circuit are MOSFETs or IGBTs.

As a preferable scheme, in the circuit structure of the battery access node in the series-connection type charge-discharge loop, the charge-discharge on-off switch circuit and the charge-discharge bypass switch circuit are MOSFETs or IGBTs having inverse diodes therein, and the inverse diodes in the MOSFETs or IGBTs form the charge freewheeling circuit and the discharge freewheeling circuit, respectively.

The utility model has the advantages that: because set up in the charge-discharge return circuit the battery access node of structure for the structure in whole charge-discharge return circuit is fairly simple, and the cost is reduced and area, this battery access node through connect in parallel at the charge-discharge bypass switch circuit of charge-discharge access end with discharge the afterflow circuit and connect in parallel mutually supporting at the afterflow circuit that charges at charge-discharge on-off switch circuit both ends, make and remove or insert the whole charge-discharge return circuit of battery in the arbitrary battery access node all can not break off, promptly: the whole charge-discharge loop is always in a closed loop state, so that the normal charge-discharge of all batteries is ensured, and the charge-discharge on-off switch circuit is not damaged due to the generation of electric arcs, so that the service life of the charge-discharge on-off switch circuit is prolonged; in addition, because the charging and discharging follow current circuit only works at the switching moment, basically no heat is generated, thereby greatly prolonging the service life of the charging and discharging follow current circuit, and simultaneously, no radiator is required to be additionally arranged, thereby saving the production cost. In addition, by adopting the charge and discharge loop of the battery access node, the battery after charge and discharge can be timely removed by sampling the voltages of all the batteries in real time, and the overcharge or the overdischarge cannot occur (which is particularly important for the charge and discharge of the lithium battery), so that the service life of the battery is greatly prolonged.

Drawings

Fig. 1 is a schematic diagram of a circuit structure of a battery access node in a first serial charge-discharge loop.

Fig. 2 is a schematic diagram of a circuit structure of a battery access node in a second series-connection charging and discharging loop.

Fig. 3 is a schematic diagram of a circuit structure of a battery access node in a third serial charging/discharging circuit.

Detailed Description

The following describes in detail a specific embodiment of a circuit structure of a battery access node in a series charging and discharging circuit according to the present invention with reference to the accompanying drawings.

As shown in fig. 1, the series-type charge-discharge circuit includes the battery access node that charge-discharge device 3 and a plurality of N series connection are in the same place to first battery access node is taken as an example, the concrete structure of battery access node includes: the charging and discharging device comprises two charging and discharging access ends A and B, wherein the charging and discharging access end A is directly used as a battery access end, the charging and discharging access end B is connected with a battery access end C through a switch SW1-1 used as a charging and discharging on-off switch circuit, a switch SW1-2 used as a charging and discharging bypass switch circuit and a diode D1-2 used as a discharging follow current circuit are further connected between the two charging and discharging access ends A and B in parallel, and two ends of the switch SW1-1 are connected with a diode D1-1 used as a charging follow current circuit in parallel.

In practical applications, the switches SW1-1 and SW1-2 may be replaced by a set of normally open contacts of a relay or a contactor, as shown in fig. 3, and the two switches SW1-1 and SW1-2 may also be replaced by a single-pole double-throw transfer relay; as shown in fig. 2, the switches SW1-1 and SW1-2 may be replaced by MOSFETs or IGBTs and their control circuits, and when the MOSFETs or IGBTs have their own backward diodes inside, the charging and discharging freewheel circuits are directly formed by the own backward diodes inside the MOSFETs or IGBTs.

When the battery is charged or discharged, the batteries BAT 1-BATn are connected to the battery access end C and another battery access end, namely the charging and discharging access end a, of the corresponding battery access node respectively. When the battery BAT1 needs to be connected to a charge-discharge loop, the switch SW1-2 is firstly opened, and then the switch SW1-1 is immediately closed; when the battery BAT1 needs to be removed from the charging and discharging loop, the switch SW1-1 is turned off first, and then the switch SW1-2 is turned on immediately.

In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the shapes, structures, features and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A circuit structure of a battery access node in a series charging and discharging loop comprises: two charge-discharge incoming ends, its characterized in that: among the two charging and discharging access ends, one charging and discharging access end is directly used as a battery access end, the other charging and discharging access end is connected with the other battery access end through a charging and discharging on-off switch circuit, two ends of the charging and discharging on-off switch circuit are connected with a charging follow current circuit in parallel, and a charging and discharging bypass switch circuit and a discharging follow current circuit are connected between the two charging and discharging access ends in parallel.

2. The circuit structure of battery access node in serial charging and discharging loop according to claim 1, wherein: the charging follow current circuit and the discharging follow current circuit are both one-way conduction devices.

3. The circuit structure of battery access node in serial charging and discharging loop according to claim 2, wherein: the unidirectional conducting device is a diode.

4. A circuit configuration of a battery access node in a series charging and discharging circuit according to claim 1, 2 or 3, characterized in that: the charging and discharging on-off switch circuit and the charging and discharging bypass switch circuit are a group of normally open contacts in a relay or a contactor.

5. A circuit configuration of a battery access node in a series charging and discharging circuit according to claim 1, 2 or 3, characterized in that: the charging and discharging on-off switch circuit and the charging and discharging bypass switch circuit adopt a single-pole double-throw switch.

6. A circuit configuration of a battery access node in a series charging and discharging circuit according to claim 1, 2 or 3, characterized in that: the charging and discharging on-off switch circuit and the charging and discharging bypass switch circuit are MOSFETs or IGBTs.

7. The circuit structure of battery access node in serial charging and discharging loop according to claim 1, wherein: the charging and discharging on-off switch circuit and the charging and discharging bypass switch circuit are MOSFETs or IGBTs with reverse diodes inside, and the reverse diodes in the MOSFETs or the IGBTs respectively form the charging follow current circuit and the discharging follow current circuit.