CN208842232U - The control circuit of preliminary filling relay is protected in battery management system - Google Patents
The control circuit of preliminary filling relay is protected in battery management system Download PDFInfo
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- CN208842232U CN208842232U CN201820598807.3U CN201820598807U CN208842232U CN 208842232 U CN208842232 U CN 208842232U CN 201820598807 U CN201820598807 U CN 201820598807U CN 208842232 U CN208842232 U CN 208842232U
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- preliminary filling
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Abstract
The utility model provides the control circuit that preliminary filling relay is protected in a kind of battery management system, the control circuit includes: power battery pack, main positive relay, main negative relay, load capacitance, preliminary filling relay, preliminary filling resistance, wherein, the positive relay of master, one end of the negative relay of master is separately connected the positive terminal of the power battery pack, negative pole end, the positive relay of master, the other end of the negative relay of master is connect with the load capacitance, the both ends that the positive relay of the master is connected to after the preliminary filling relay series connection precharging circuit form parallel circuit, the precharging circuit includes the first preliminary filling resistance being sequentially connected in series, filter capacitor, the circuit that second preliminary filling resistance is formed, the other end of the filter capacitor is connect with the negative pole end of the power battery pack.The control circuit, to form low-pass filtering net, reduces current signal noise jamming by setting preliminary filling resistance and capacitor, guarantees preliminary filling loop current stability, extends the service life of preliminary filling relay.
Description
Technical field
The utility model relates to technical field of battery management, has and be related to protecting preliminary filling relay in a kind of battery management system
The control circuit of device.
Background technique
With the promotion of national new energy policy, the market share shared by electric car is increasing, but electric car rises
Fiery event also frequently occurs.Therefore, people increasingly pay attention to the safety for the power battery that power is provided for electric car, from
And perfect aspect is badly in need of at one to the battery management system that power battery is managed.And influence power battery safety
A principal element be high-voltage relay adhesion problems.The high-voltage relay is for controlling power battery and electric car
The connecting and disconnecting of motor, relay are equivalent to a safety switch.Therefore the quality of the working condition of relay is to vehicle
The influence of energy can not be ignored.
For electric car in braking or deceleration, power battery pack is under battery management system (BMS) control by power generation
The electric energy that machine generates charges, and in dynamic mode, power battery pack is by electric discharge to drive vehicle motor.Power battery pack is filled
In electricity and discharge process, BMS frequently controls relay closure, disconnects.Before relay is closed every time, it is necessary to battery
Capacitor in the connected high-pressure system of packet is pre-charged, and after the completion of determining pre-charge process, ability closing relay is no
Then, contact adhesion phenomenon easily occurs for relay.So-called relay adhesion is exactly the wink connected in power battery pack high-pressure system
Between, relay pulls out electric arc before contact, and contact is melted in high-temperature electric arcing, and the phenomenon that disconnect contact can not.High-voltage relay
The damage of device such as adhesion, there are great security risks, are easy to cause power battery over-discharge, excess temperature, even occur when serious
The major accidents such as fire, explosion, seriously threaten passenger, car inspection and repair personnel's personal safety.
High-pressure system capacitor pre-charge method at present is first closed total negative relay and pre-charge-relay, when BMS is acquired
The total voltage of battery pack and the voltage value at capacitor both ends when difference is less than certain value, determine that pre-charge process is completed, closed high
Total positive relay in system disconnects preliminary filling relay contact, then drives electric automobile motors.But it is pre- in high-pressure system capacitor
In charging process, due to current break in precharging circuit, lead to preliminary filling relay damaged failure, reduces the use of preliminary filling relay
Service life.
Utility model content
In order to overcome the deficiencies of the prior art, this practical provides protects preliminary filling relay in a kind of battery management system
Control circuit, the control circuit, to form low-pass filtering net, it is dry to reduce current signal clutter by setting preliminary filling resistance and capacitor
It disturbs, guarantees preliminary filling loop current stability, extend the service life of preliminary filling relay.
The utility model provides the control circuit that preliminary filling relay is protected in a kind of battery management system, and the control is electric
Road includes: power battery pack, main positive relay, main negative relay, load capacitance, preliminary filling relay, preliminary filling resistance, wherein institute
State main positive relay, one end of the negative relay of the master is separately connected the positive terminal of the power battery pack, negative pole end, the master
Positive relay, the negative relay of the master the other end connect with the load capacitance, the preliminary filling relay series connection precharging circuit
The both ends for being connected to the positive relay of the master afterwards form parallel circuit, and the precharging circuit includes the first precharge being sequentially connected in series
The circuit that resistance, filter capacitor, the second preliminary filling resistance are formed, the cathode of the other end of the filter capacitor and the power battery pack
End connection.
Preferably, the precharging circuit includes the first preliminary filling resistance being sequentially connected in series, the first filter capacitor, the second precharge
The first precharging circuit formed is hindered, the other end of first filter capacitor is connect with the negative pole end of the power battery, described
The second preliminary filling resistance other end is connected with the preliminary filling relay.
Preferably, the precharging circuit further includes resistance switching relay, and the resistance switching relay is equipped with normally opened
Contact, at least two normally-closed contacts, first normally-closed contact are connected with first precharging circuit, second normally-closed contact
It connects with the second precharging circuit, second precharging circuit includes being sequentially connected in series third preliminary filling resistance, the second filter capacitor, the 4th
The circuit that preliminary filling resistance is formed, the other end of second filter capacitor connect with the negative pole end of the power battery, and described the
The four preliminary filling resistance other ends are connected with the preliminary filling relay.
Preferably, the resistance switching relay is closed the first normally-closed contact, and the preliminary filling relay is closed, and described first
Preliminary filling resistance and first filter capacitor form level-one filtering, bear described in the second preliminary filling resistance and high-voltage control circuit
It carries capacitor and forms secondary filter.
The utility model has the following beneficial effects: the utility model, which provides, protects preliminary filling relay in a kind of battery management system
The control circuit of device, for the control circuit by the way that precharging circuit is arranged, preliminary filling resistance and capacitor in precharging circuit form low pass filtered
Wave net can reduce current signal noise jamming, guarantee preliminary filling loop current stability, and extend preliminary filling relay uses the longevity
Life, and due to the setting of precharging circuit, eliminate main positive relay and main negative relay both end voltage it is excessive cause it is main just after
Electric appliance and main negative relay adhesion fault occur, which is also provided with the second spare precharging circuit, prevents first
After precharging circuit failure, relay contact is switched by convert resistance, eliminate preliminary filling relay, main positive relay, it is main it is negative after
Electric appliance sticks together failure, improves the security level of precharging circuit Yu battery management system entirety, has reached and met
The requirement of ISO26262 functional safety.
Detailed description of the invention
The electric operation control circuit figure of preliminary filling relay is protected in a kind of Fig. 1 battery management system provided by the utility model.
Specific embodiment
Specific embodiment of the present utility model is described in further detail below in conjunction with attached drawing, to enable art technology
Personnel's refer to the instruction text can be implemented accordingly.
It should be appreciated that mention in the present specification or may mention up, down, left, right, before and after, front, the back side, top
The positional terms such as portion, bottom are defined relative to each construction shown in the drawings, they are opposite concepts, therefore are had
Different location according to locating for it, different use state and correspondingly changed.So also should not by these or
Other positional terms are construed to restricted term.
The utility model provides the control circuit that preliminary filling relay is protected in a kind of battery management system, the control circuit
It include: power battery pack, main positive relay, main negative relay, load capacitance A, preliminary filling relay, preliminary filling resistance, wherein described
Main positive relay, the negative relay of the master one end be separately connected the positive terminal of the power battery pack, negative pole end, the master is just
Relay, the negative relay of the master the other end connect with the load capacitance, after preliminary filling relay series connection precharging circuit
The both ends for being connected to the positive relay of the master form parallel circuit, and the precharging circuit includes the first preliminary filling resistance being sequentially connected in series
The circuit that R1, filter capacitor C1, the second preliminary filling resistance R11 are formed, the other end and the power battery of the filter capacitor C1
The negative pole end of packet connects.
The precharging circuit includes resistance switching relay, the first precharging circuit, the second precharging circuit ... N precharge
Road, resistance switching relay are equipped with normally opened contact, at least two normally-closed contacts, first normally-closed contact 1 with it is described
The series connection of first precharging circuit, second normally-closed contact 2 are connected with the second precharging circuit, N normally-closed contact and the N preliminary filling
Two precharging circuits, the resistance switching relay setting and preliminary filling circuit same number is usually arranged in circuit series connection
Normally-closed contact, first precharging circuit include the first preliminary filling resistance R1, the first filter capacitor C1, the second preliminary filling being sequentially connected in series
The circuit that resistance R11 is formed, the other end that the first filtered electrical C1 holds are connect with the negative pole end of the power battery, and described the
The two preliminary filling resistance R11 other ends are connected with the preliminary filling relay, and second precharging circuit includes being sequentially connected in series third preliminary filling
Resistance R2, the second filter capacitor C2, the 4th preliminary filling resistance R22 formed circuit, the other end of the second filter capacitor C2 with
The negative pole end of the power battery connects, and the 4th preliminary filling resistance R22 other end is connected with the preliminary filling relay.
In general, the resistance switching relay is closed the first normally-closed contact 1, the preliminary filling relay is closed, described first
Preliminary filling resistance R1 and the first filter capacitor C1 forms level-one filtering, the second preliminary filling resistance R11 and high-voltage control circuit
Described in load capacitance A formed secondary filter.It can be before the second preliminary filling resistance R11 in first precharging circuit
Multiple repetitive units such as the first preliminary filling resistance R1 and the first filter capacitor C1 composition are set.Make because capacitor plays filtering
With electric current is after the first preliminary filling resistance R1 and the first filter capacitor C1 forms level-one filtering, 10Khz or more clutter
It is filtered out completely, forms secondary filter by load capacitance A described in the second preliminary filling resistance R11 and high-voltage control circuit
Afterwards, 100hz or more clutter is filtered out completely, reaches requirement, current signal after secondary filter after secondary filter by electric current
Noise jamming signal it is less, electric current can be more stable in precharging circuit, extends the service life of preliminary filling relay.Described
More several such as the first preliminary filling resistance R1 and the first filter capacitor C1 of setting are formed multiple heavy before two preliminary filling resistance R11
Multiple unit, can have certain effect, but effect is unobvious to filtering clutter.
In specific embodiment of the utility model, the second precharging circuit is the stand-by circuit of the first precharging circuit, when
One precharging circuit blow or the first precharging circuit in after preliminary filling resistance failure, relay normally closed contact 2 is connected to by switching,
The second precharging circuit is switched to, ensure that precharging circuit normal use, the stability of precharging circuit is improved, then eliminates master
Positive relay and main negative relay both end voltage are excessive and cause to lead positive relay and main negative relay adhesion fault occurs, that is, protect
The stability and safe handling for having demonstrate,proved main positive relay and main negative relay, also comply with ISO26262 functional safety requirement, improve
The safety integrity level of battery management system.
It is not only in the description and the implementation although the embodiments of the present invention have been disclosed as above
Listed utilization, it can be applied to various fields suitable for the present invention completely, for those skilled in the art,
Other modifications may be easily implemented, therefore without departing from the general concept defined in the claims and the equivalent scope, this reality
It is not limited to specific details and legend shown and described herein with novel.
Claims (3)
1. in a kind of battery management system protect preliminary filling relay control circuit, the control circuit include: power battery pack,
Main positive relay, main negative relay, load capacitance, preliminary filling relay, preliminary filling resistance, which is characterized in that the positive relay of the master,
One end of the negative relay of master is separately connected the positive terminal of the power battery pack, negative pole end, the positive relay of the master, described
The other end of main negative relay is connect with the load capacitance, is connected to the master after the preliminary filling relay series connection precharging circuit
The both ends of positive relay form parallel circuit, and the precharging circuit includes the first preliminary filling resistance being sequentially connected in series, filter capacitor, the
The circuit that two preliminary filling resistance are formed, the other end of the filter capacitor are connect with the negative pole end of the power battery pack.
2. protecting the control circuit of preliminary filling relay in battery management system according to claim 1, which is characterized in that institute
Stating precharging circuit includes the first preliminary filling that the first preliminary filling resistance, the first filter capacitor, the second preliminary filling resistance being sequentially connected in series are formed
The other end of circuit, first filter capacitor is connect with the negative pole end of the power battery, and the second preliminary filling resistance is another
It connects with the preliminary filling relay at end.
3. protecting the control circuit of preliminary filling relay in battery management system according to claim 2, which is characterized in that institute
Stating precharging circuit further includes resistance switching relay, resistance switching relay be equipped with normally opened contact, at least two it is normally closed
Contact, first normally-closed contact are connected with first precharging circuit, second normally-closed contact and the second precharging circuit string
Connection, second precharging circuit include the electricity for being sequentially connected in series third preliminary filling resistance, the second filter capacitor, the 4th preliminary filling resistance and being formed
The other end on road, second filter capacitor is connect with the negative pole end of the power battery, the 4th preliminary filling resistance other end
It connects with the preliminary filling relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820598807.3U CN208842232U (en) | 2018-04-25 | 2018-04-25 | The control circuit of preliminary filling relay is protected in battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820598807.3U CN208842232U (en) | 2018-04-25 | 2018-04-25 | The control circuit of preliminary filling relay is protected in battery management system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208842232U true CN208842232U (en) | 2019-05-10 |
Family
ID=66351318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820598807.3U Expired - Fee Related CN208842232U (en) | 2018-04-25 | 2018-04-25 | The control circuit of preliminary filling relay is protected in battery management system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208842232U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111546892A (en) * | 2020-04-21 | 2020-08-18 | 汉腾汽车有限公司 | Control sequence method for relay in failure of new energy automobile power battery system |
| CN113707955A (en) * | 2021-09-28 | 2021-11-26 | 蜂巢能源科技有限公司 | Method, device and system for controlling relay inside distribution box of battery system |
| CN114312391A (en) * | 2020-09-30 | 2022-04-12 | 比亚迪股份有限公司 | Pre-charging control system and method and vehicle |
-
2018
- 2018-04-25 CN CN201820598807.3U patent/CN208842232U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111546892A (en) * | 2020-04-21 | 2020-08-18 | 汉腾汽车有限公司 | Control sequence method for relay in failure of new energy automobile power battery system |
| CN114312391A (en) * | 2020-09-30 | 2022-04-12 | 比亚迪股份有限公司 | Pre-charging control system and method and vehicle |
| CN114312391B (en) * | 2020-09-30 | 2023-08-08 | 比亚迪股份有限公司 | Pre-charge control system, method and vehicle |
| CN113707955A (en) * | 2021-09-28 | 2021-11-26 | 蜂巢能源科技有限公司 | Method, device and system for controlling relay inside distribution box of battery system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200115 Address after: Room 710, 701-712, juoyue Times Square building, No. 4068, Yitian Road, Futian community, Futian District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Lvting Power Technology Co.,Ltd. Address before: 230000 B3 workshop of garment processing park, Yaohai Industrial Park, Hefei, Anhui Patentee before: ANHUI EAST ROAD NEW ENERGY TECHNOLOGY CO.,LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190510 |