CN211830237U - Battery charging and discharging circuit - Google Patents
Battery charging and discharging circuit Download PDFInfo
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- CN211830237U CN211830237U CN201920818889.2U CN201920818889U CN211830237U CN 211830237 U CN211830237 U CN 211830237U CN 201920818889 U CN201920818889 U CN 201920818889U CN 211830237 U CN211830237 U CN 211830237U
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- battery module
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Abstract
The utility model relates to a battery charge-discharge circuit belongs to energy memory technical field. The battery charging and discharging circuit includes: the battery branch is formed by connecting at least two battery modules in series; each battery module is provided with a cut-out switch for cutting it out of the battery branch. The circuit is simple and reliable, low in cost, and capable of ensuring the service life of the battery by cutting off the overcharged or overdischarged battery module without influencing the normal work of other battery modules through configuring a cutting-off switch for each battery module.
Description
Technical Field
The utility model relates to a battery charge-discharge circuit belongs to energy memory technical field.
Background
With the development of the automobile industry, electric automobiles have become a trend of development in the future. The battery system of the electric automobile is formed by connecting a plurality of battery modules in series, and due to the existence of the barrel effect, when the consistency of the batteries is poor, the whole battery system cannot be charged and discharged after individual batteries reach the charging and discharging cut-off condition, and the available capacity of the battery system is influenced. In recent years, the above problems are solved by equalizing charge, for example, chinese patent document No. CN 106849266B discloses an equalizing circuit for lithium battery charge and discharge power source management, which selects a double-pole single-throw relay as a switch on-off element for selecting a battery, and performs equalizing charge of each battery module by detecting the voltage of each battery module, thereby avoiding the battery module from being shortened in service life due to overcharge and overdischarge of the battery module, and affecting the whole battery system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a battery charging and discharging circuit for it is too complicated to solve current battery charging and discharging circuit, leads to problem with high costs.
In order to achieve the above object, the utility model provides a battery charging and discharging circuit, this battery charging and discharging circuit includes:
the battery branch is formed by connecting at least two battery modules in series;
each battery module is provided with a cut-out switch for cutting it out of the battery branch.
The beneficial effects are that: this circuit is through disposing the excision switch for every battery module, with this battery module excision when certain battery module overcharges or overdischarging, and then do not influence other battery module's normal work, the circuit is simple reliable, and is with low costs, will overcharge or the excision of overdischarging battery module moreover, can guarantee the life of battery, and then guarantee whole charge-discharge system's life.
Furthermore, the cut-off switch is a single-pole double-throw switch, each single-pole double-throw switch comprises a movable contact and two fixed contacts, the movable contact and the fixed contacts are arranged on the battery branch circuit, the fixed contacts are connected with one end of the corresponding battery module, and the other fixed contacts are connected with the other end of the battery module through the cut-off circuit.
The beneficial effects are that: through the single-pole double-throw switch, the overcharged or overdischarged battery module can be completely cut off from the battery branch, and the stability of a charging and discharging system is further ensured.
Furthermore, the battery charging and discharging circuit also comprises a single voltage acquisition module correspondingly connected with each battery module and used for acquiring the voltage of each battery module.
The beneficial effects are that: the circuit judges whether the battery module is overcharged or overdischarged according to the voltage of each battery module, and is simple and reliable.
Furthermore, the battery charging and discharging circuit further comprises a control module, wherein the control module is connected with the cut-off switch and used for controlling the cut-off of the battery module corresponding to the cut-off switch.
The beneficial effects are that: the control module can automatically and quickly control the cut-off switch, so that the over-charged or over-discharged battery module can be cut off from the battery branch reliably and timely, and the stability of a charge and discharge system is further ensured.
Furthermore, the battery charging and discharging circuit further comprises a control module, the input end of the control module is connected with each monomer voltage acquisition module, and the output end of the control module is connected with the cut-off switch and used for controlling the cut-off of the battery module corresponding to the cut-off switch through voltage information.
The beneficial effects are that: the control module judges whether the battery module is cut off or not through the voltage information, the cut-off switch can be automatically and rapidly controlled through the control module, the battery module which is overcharged or overdischarged is ensured to be cut off from the battery branch reliably and timely, and the stability of a charging and discharging system is further ensured.
Drawings
Fig. 1 is a circuit diagram of a battery charging and discharging circuit of the present invention;
FIG. 2 is a particular embodiment of the cut-off switch of the present invention;
fig. 3 is a flow chart of the battery charging and discharging circuit of the present invention.
Detailed Description
The battery charging and discharging circuit proposed in this embodiment is shown in fig. 1, and includes a battery branch formed by connecting at least two battery modules in series; each battery module is provided with a cut-out switch.
The battery branch is used for connecting a charging device or a load to charge or discharge the battery, and the cut-off switch is used for cutting off the corresponding battery module from the battery branch in the case of overcharge or overdischarge.
In the present embodiment, the number of battery modules is n, that is, Bat 1, Bat 2, Bat 3, …, Bat n in the figure; the excision switch is a single-pole double-throw switch, each single-pole double-throw switch comprises a movable contact and two fixed contacts, the movable contact and the fixed contacts are arranged on the battery branch circuit, the fixed contacts are connected with one end of the corresponding battery module, and the other fixed contacts are connected with the other end of the battery module through the excision circuit. As another embodiment, the cut-off switch may be a single-pole switch connected in parallel with the corresponding battery module as shown in fig. 2, but this method cannot completely cut off the battery module from the battery branch, that is, when the single-pole switch is closed, the overcharged or overdischarged battery module is still connected in the battery branch, which may have a certain influence on other battery modules and cause instability of the charging and discharging system. Of course, the excision switch can be manual switch, also can be electronic switch, the utility model discloses do not do the restriction to the embodiment of excision switch, as long as can realize with the battery module follow battery branch road excision that corresponds can.
In this embodiment, the battery charging and discharging circuit further includes a single voltage collecting module (i.e., the single battery voltage collecting module in fig. 1) correspondingly connected to each battery module, and is configured to collect voltages of the battery modules, and determine whether each battery module is overcharged or overdischarged according to the voltages of the battery modules. Of course, there are many methods for determining whether the battery module is overcharged or overdischarged, and the present invention is not limited to this type of voltage collection.
In this embodiment, the battery charging and discharging circuit further includes a control module, and the control module is connected to the single-pole double-throw switch and is used for controlling the battery module corresponding to the single-pole double-throw switch to be cut off. The control module can receive the information collected by each monomer voltage collecting module and then control the cutting of the battery module, and can also manually control the control module to control the cutting of the battery module. Of course, in the case where the cut-off switch is a manual switch, the control module may be absent.
As a specific implementation mode, the fixed contact and the movable contact of the single-pole double-throw switch are the contacts of a double-contact relay, the control module is a relay control module, and the output end of the relay control module and the control coil (namely S in the figure) of each relay1、S2、S3、…、Sn) And the input end of the relay control module is connected with each monomer voltage acquisition module and is used for receiving the voltage information acquired by each monomer voltage acquisition module and judging whether to control the battery module corresponding to each double-contact relay to be cut off.
The working process of the battery charging and discharging circuit is shown in fig. 3:
when a battery charging and discharging circuit is charged and discharged, firstly, judging whether a double-contact relay is electrified or not (the double-contact relay is electrified to enable a corresponding battery module to be in a cut-off state, and the double-contact relay is powered off to enable the corresponding battery module to be connected into a battery branch circuit);
when judging that the double-contact relay is electrified, the direction of the current can be divided into two conditions: 1) if the battery charging and discharging circuit discharges, judging whether the voltage of the battery module corresponding to the charged double-contact relay is greater than a discharging release threshold value, if so, controlling the double-contact relay to be powered off, connecting the corresponding battery module into a battery branch circuit, and entering a discharging process; if not, entering a discharging process; 2) if the battery charging and discharging circuit is charged, judging whether the voltage of the battery module corresponding to the charged double-contact relay is smaller than a charging release threshold value, if so, controlling the double-contact relay to be powered off, connecting the corresponding battery module into a battery branch circuit, and entering a charging process; if not, entering a charging process;
when the double-contact relay is judged not to be electrified, the battery charging and discharging circuit directly enters a charging and discharging process;
the charging process comprises the steps that the single voltage acquisition module detects voltages at two ends of each battery module in real time, the acquired voltage information is sent to the relay control module, and when the battery module is judged to be overcharged (greater than an overcharge threshold value), the corresponding double-contact relay is controlled to be electrified, and the corresponding battery module is cut off;
the discharging process is that the single voltage acquisition module detects voltages at two ends of each battery module in real time, and sends acquired voltage information to the relay control module, and when the battery module is over-discharged (smaller than an over-discharge threshold value), the corresponding double-contact relay is controlled to be electrified, and the corresponding battery module is cut off.
The charge release threshold may be equal to the overcharge threshold, may be slightly smaller (about 100mV smaller) than the overcharge threshold or smaller to avoid frequent switching of the two-contact relay, and similarly, the discharge release threshold may be equal to the overdischarge threshold, may be slightly larger (about 100mV larger) than the overdischarge threshold or larger.
Claims (3)
1. A battery charge and discharge circuit, comprising:
the battery branch is formed by connecting at least two battery modules in series;
each battery module is provided with a cut-off switch for cutting off the battery module from a battery branch, the cut-off switch is a single-pole double-throw switch, each single-pole double-throw switch comprises a movable contact and two fixed contacts, one movable contact and one fixed contact are arranged on a battery branch, the fixed contacts are connected with one end of the corresponding battery module, and the other fixed contact is connected with the other end of the battery module through a cut-off circuit; one movable contact and two fixed contacts of the single-pole double-throw switch are contacts of a double-contact relay;
the control module is a relay control module, and the output end of the relay control module is connected with the control coil of each double-contact relay.
2. The battery charging and discharging circuit according to claim 1, further comprising a cell voltage collecting module connected to each battery module for collecting voltage of each battery module.
3. The battery charging and discharging circuit according to claim 2, wherein the input end of the control module is connected to each cell voltage acquisition module, and the output end of the control module is connected to the cut-off switch, so as to control the cut-off of the battery module corresponding to the cut-off switch through the voltage information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920818889.2U CN211830237U (en) | 2019-05-31 | 2019-05-31 | Battery charging and discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920818889.2U CN211830237U (en) | 2019-05-31 | 2019-05-31 | Battery charging and discharging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211830237U true CN211830237U (en) | 2020-10-30 |
Family
ID=72995395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920818889.2U Expired - Fee Related CN211830237U (en) | 2019-05-31 | 2019-05-31 | Battery charging and discharging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211830237U (en) |
-
2019
- 2019-05-31 CN CN201920818889.2U patent/CN211830237U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201030 Termination date: 20210531 |
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| CF01 | Termination of patent right due to non-payment of annual fee |