CN207117237U - A kind of soft starting circuit of battery pack - Google Patents
A kind of soft starting circuit of battery pack Download PDFInfo
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- CN207117237U CN207117237U CN201720941348.XU CN201720941348U CN207117237U CN 207117237 U CN207117237 U CN 207117237U CN 201720941348 U CN201720941348 U CN 201720941348U CN 207117237 U CN207117237 U CN 207117237U
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Abstract
A kind of soft starting circuit of battery pack, including：Battery pack, voltage acquisition unit, relay unit, pre- charge/discharge unit and MCU control unit, total positive output end of battery pack are connected with the collection terminal of voltage acquisition unit and the first end of relay unit respectively；Second end of relay unit is connected with the input of pre- charge/discharge unit, 3rd end is connected with the first output end of pre- charge/discharge unit, first signal output part of the first control terminal and MCU control unit connects, and the secondary signal output end of the second control terminal and MCU control unit connects；First signal input part of MCU control unit and the output end of voltage acquisition unit are connected, and secondary signal input is connected with the second output end of pre- charge/discharge unit；First output end of pre- charge/discharge unit is connected with external load or charge power supply.This technical scheme can be effectively prevented from peak current and circuit components are caused to damage.
Description
Technical field
Battery art is the utility model is related to, more particularly to a kind of soft starting circuit of battery pack.
Background technology
For battery pack when discharge and recharge starts, charging and discharging currents are that specified several times even several times of chargings are opened from zero instantaneous abrupt change
Streaming current or electric discharge starting current, slope is quite big, and this electric current is spike electric current, to main loop key componentses
And the impact failure degree of battery pack is very big, system or key componentses can be substantially reduced for a long time by frequently starting
Service life cycle.
On the other hand, in the circuit of reality, it will usually add some buffering components and spike electric current is absorbed, compared with
Commonly between the output end of battery pack and the input of load in parallel one by MOS switch and absorbed power resistant series group
Into buffering branch road；Or using PTC temperature characterisitic come absorbing peak pulse electric current；Or utilize multiple Control major loops
And pre- charging and discharging circuit reaches the effect of smooth starting current, because MOS group impact resistances are weak, PTC power can not be done
Multiple Control costs are larger in the case of to very big, high current and the reasons such as control logic is complicated, and above technical scheme is all
There are the defects of corresponding different degrees of and limitation.
Utility model content
The purpose of this utility model is to overcome weak point of the prior art, there is provided a kind of soft start electricity of battery pack
Road.
The purpose of this utility model is achieved through the following technical solutions：
A kind of soft starting circuit of battery pack, including：Battery pack, voltage acquisition unit, relay unit, pre- discharge and recharge list
Member and MCU control unit, total positive output end of the battery pack respectively with the collection terminal of the voltage acquisition unit and it is described after
The first end connection of electric appliance unit；
Second end of the relay unit is connected with the input of the pre- charge/discharge unit, the 3rd end and the preliminary filling
The first output end connection of discharge cell, the first control terminal are connected with the first signal output part of the MCU control unit, and second
Control terminal is connected with the secondary signal output end of the MCU control unit；
First signal input part of the MCU control unit is connected with the output end of the voltage acquisition unit, the second letter
Number input is connected with the second output end of the pre- charge/discharge unit；
First output end of the pre- charge/discharge unit is connected with external load or charge power supply.
In one of the embodiments, the voltage acquisition unit includes first resistor R1, second resistance R2,3rd resistor
Collection terminal of R3 and the first electric capacity C1, the first resistor R1 one end as the voltage acquisition unit, the 3rd resistor
Output end of the R3 one end as the voltage acquisition unit, the other end series connection second resistance R2 of the first resistor R1
After be grounded；
Connecting node between the other end of the 3rd resistor R3 and the first resistor R1 and the second resistance R2
Connection；
One end of the first electric capacity C1 is connected with one end of the 3rd resistor R3, other end ground connection.
In one of the embodiments, the pre- charge/discharge unit includes the 4th resistance R4, the 5th resistance R5, the 6th resistance
Input of R6 and the second electric capacity C2, the 4th resistance R4 one end as the pre- charge/discharge unit, the other end is as institute
The first output end of pre- charge/discharge unit is stated, one end of the 6th resistance R6 exports as the second of the pre- charge/discharge unit
End, one end of the 5th resistance R5 are connected with the other end of the 4th resistance R4, other end series connection the 6th resistance R6
After be grounded；
One end of the second electric capacity C2 is connected with one end of the 6th resistance R6, other end ground connection.
In one of the embodiments, the relay unit is single-pole double throw bistable relay.
This technical scheme has following beneficial effect compared to prior art：
1. pre- charge/discharge unit is set, when battery pack carries out the starting stage of discharge and recharge, MCU control unit control relay
Device unit so that pre- charge/discharge unit absorbs peak current；In battery set charge/discharge later stage, MCU control unit control after
Electric appliance unit, the short circuit of pre- charge/discharge unit avoids in discharge and recharge starting stage peak current to circuit components well
Damage.
2. voltage acquisition unit and pre- charge/discharge unit all have voltage acquisition function, in MCU control unit decision circuit
In front and rear step voltage exception be present, control relay unit disconnects, and is effectively protected circuit.
Brief description of the drawings
Fig. 1 is the soft starting circuit principle framework schematic diagram of battery pack in the present embodiment；
Fig. 2 is the soft starting circuit principle schematic of battery pack in the present embodiment.
Embodiment
For the ease of understanding the utility model, the utility model is more fully retouched below with reference to relevant drawings
State.Better embodiment of the present utility model is given in accompanying drawing.But the utility model can come in many different forms
Realize, however it is not limited to embodiments described herein.On the contrary, the purpose for providing these embodiments is to make to this practicality newly
The more thorough and comprehensive that the disclosure of type understands.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is simply in term used in the description of the present utility model herein
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " bag
Include the arbitrary and all combination of the Listed Items of one or more correlations.
A kind of soft starting circuit of battery pack, reference picture 2 is please combined in the lump, including：Battery pack, voltage acquisition unit 100,
Relay unit 200, pre- charge/discharge unit 300 and MCU control unit 400, total positive output end of the battery pack respectively with institute
The collection terminal for stating voltage acquisition unit 100 connects with the first end of the relay unit 200；
Second end of the relay unit 200 is connected with the input of the pre- charge/discharge unit 300, the 3rd end and institute
The first output end connection of pre- charge/discharge unit 300 is stated, the first signal of the first control terminal and the MCU control unit 400 is defeated
Go out end connection, the second control terminal is connected with the secondary signal output end of the MCU control unit 400；
First signal input part of the MCU control unit 400 is connected with the output end of the voltage acquisition unit 100,
Secondary signal input is connected with the second output end of the pre- charge/discharge unit 300；
First output end of the pre- charge/discharge unit 300 is connected with external load or charge power supply.
Specifically, the voltage acquisition unit 100 includes first resistor R1, second resistance R2,3rd resistor R3 and first
Collection terminal of electric capacity C1, the first resistor R1 one end as the voltage acquisition unit 100, the one of the 3rd resistor R3
Output end as the voltage acquisition unit 100 is held, after the other end series connection second resistance R2 of the first resistor R1
Ground connection；
Connecting node between the other end of the 3rd resistor R3 and the first resistor R1 and the second resistance R2
Connection；
One end of the first electric capacity C1 is connected with one end of the 3rd resistor R3, other end ground connection.
Specifically, the pre- charge/discharge unit 300 includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and second
Input of electric capacity C2, the 4th resistance R4 one end as the pre- charge/discharge unit 300, the other end is as the preliminary filling
First output end of discharge cell 300, one end of the 6th resistance R6 export as the second of the pre- charge/discharge unit 300
End, one end of the 5th resistance R5 are connected with the other end of the 4th resistance R4, other end series connection the 6th resistance R6
After be grounded；
One end of the second electric capacity C2 is connected with one end of the 6th resistance R6, other end ground connection.
Specifically, the relay unit 200 is single-pole double throw bistable relay.
Concrete operating principle：
It should be noted that referring once again to Fig. 2, the B+ in Fig. 2 is total positive output end of battery pack, the P+ in Fig. 2
As total positive input terminal of external load or charge power supply, the AI1 in Fig. 2 are the output end of voltage acquisition unit 100, figure
AI2 in 2 is the second output end of pre- charge/discharge unit 300.
Discharge process, voltage acquisition unit 100 is by the control source of collection to MCU control unit 400, MCU control unit
400 in the case where judging that battery pack output voltage is without exception, and MCU control unit 400 inputs control letter to relay unit 200
Number, pre- charge/discharge unit 300 is turned on.Idiographic flow is, MCU control unit 400 is by the first control terminal of relay unit 200
(i.e. DO1 ports in Fig. 2) is set low, and the second control terminal puts high (i.e. DO2 ports in Fig. 2), the first end of relay unit 200
(i.e. c ports in Fig. 2) and the second end (i.e. b ports in Fig. 2) adhesive, pre- charge/discharge unit 300 are started working, absorb and putting
Electric process caused peak current in a flash.MCU control unit 400 sets low the second control terminal of relay unit 200, and first
Control terminal puts height, the input of relay unit 200 and the 3rd end (i.e. a ports in Fig. 2) adhesive, now pre- charge/discharge unit
300 are no longer operated, but battery pack is still by relay unit 200 to external load discharge.
It needs to be emphasized that in discharge process, voltage acquisition unit 100 and pre- charge/discharge unit 300 all have
Voltage acquisition function (unit of collection inputs from AI1 the and AI2 ports in Fig. 2 to MCU control unit 400), is controlled in MCU
In the decision circuit of unit 400 there is exception in front and rear step voltage, and control relay unit 200 disconnects (i.e. first end and the
Two ends and the 3rd end not adhesives), it is effectively protected circuit.
Charging process, voltage acquisition unit 100 gather battery voltage and inputted to MCU control unit 400, MCU control lists
For member 400 when judging that battery pack needs to be charged, MCU control unit 400 is by the first end of relay unit 200 and the second end
Adhesive, pre- charge/discharge unit 300 work, and charge power supply charges to battery pack, after charging process carries out a period of time,
The first end of the control relay unit 200 of MCU control unit 400 and the 3rd end end adhesive, now pre- charge/discharge unit 300 is no longer
It is operated, but charge power supply is still charged by relay unit 200 to battery pack.
It should be noted that either in charging process or discharge process, pre- charge/discharge unit 300, in battery pack
When carrying out the starting stage of discharge and recharge, the control relay unit 200 of MCU control unit 400 so that pre- charge/discharge unit 300 is inhaled
Receive peak current；In battery set charge/discharge later stage, the control relay unit 200 of MCU control unit 400 so that pre- charge and discharge
Electric unit 300 no longer works, and avoids well in damage of the discharge and recharge starting stage peak current to circuit components.
It should also be noted that, referring once again to Fig. 2, after pre- discharge and recharge terminates, loop where Schottky diode D2 connects
Logical, Schottky diode D2 enters row buffering electric discharge, after discharge and recharge terminates, Schottky two to the second control coil L2 corresponding to it
Pole pipe D1 loops are connected, and Schottky diode D1 enters row buffering electric discharge to the first control coil L1 corresponding to it, avoids relay
Device unit 200 draws fox, produces the phenomenon of sparking.
It should also be noted that, need to leave certain dead time between pre- charge/discharge and charge/discharge, ensure contact a and
There was only an adhesive between the b of contact.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (4)
- A kind of 1. soft starting circuit of battery pack, it is characterised in that including：Battery pack, voltage acquisition unit (100), relay Unit (200), pre- charge/discharge unit (300) and MCU control unit (400), total positive output end of the battery pack respectively with institute The collection terminal for stating voltage acquisition unit (100) connects with the first end of the relay unit (200)；Second end of the relay unit (200) is connected with the input of the pre- charge/discharge unit (300), the 3rd end and institute State the first output end connection of pre- charge/discharge unit (300), the first letter of the first control terminal and the MCU control unit (400) The connection of number output end, the second control terminal are connected with the secondary signal output end of the MCU control unit (400)；First signal input part of the MCU control unit (400) is connected with the output end of the voltage acquisition unit (100), Secondary signal input is connected with the second output end of the pre- charge/discharge unit (300)；First output end of the pre- charge/discharge unit (300) is connected with external load or charge power supply.
- 2. the soft starting circuit of battery pack according to claim 1, it is characterised in that the voltage acquisition unit (100) Described in one end including first resistor R1, second resistance R2,3rd resistor R3 and the first electric capacity C1, the first resistor R1 is used as The collection terminal of voltage acquisition unit (100), the output of one end of the 3rd resistor R3 as the voltage acquisition unit (100) Hold, be grounded after the other end series connection second resistance R2 of the first resistor R1；Connecting node connection between the other end of the 3rd resistor R3 and the first resistor R1 and the second resistance R2；One end of the first electric capacity C1 is connected with one end of the 3rd resistor R3, other end ground connection.
- 3. the soft starting circuit of battery pack according to claim 1, it is characterised in that the pre- charge/discharge unit (300) Including the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2, described in one end conduct of the 4th resistance R4 The input of pre- charge/discharge unit (300), first output end of the other end as the pre- charge/discharge unit (300), described Second output end of the six resistance R6 one end as the pre- charge/discharge unit (300), one end of the 5th resistance R5 and institute The 4th resistance R4 other end connection is stated, is grounded after other end series connection the 6th resistance R6；One end of the second electric capacity C2 is connected with one end of the 6th resistance R6, other end ground connection.
- 4. the soft starting circuit of battery pack according to claim 1, it is characterised in that the relay unit (200) is Single-pole double throw bistable relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720941348.XU CN207117237U (en) | 2017-07-31 | 2017-07-31 | A kind of soft starting circuit of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720941348.XU CN207117237U (en) | 2017-07-31 | 2017-07-31 | A kind of soft starting circuit of battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN207117237U true CN207117237U (en) | 2018-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720941348.XU Active CN207117237U (en) | 2017-07-31 | 2017-07-31 | A kind of soft starting circuit of battery pack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818393A (en) * | 2019-01-23 | 2019-05-28 | 宁德时代新能源科技股份有限公司 | Pre-charging circuit and pre-charging method of high-voltage battery pack |
-
2017
- 2017-07-31 CN CN201720941348.XU patent/CN207117237U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818393A (en) * | 2019-01-23 | 2019-05-28 | 宁德时代新能源科技股份有限公司 | Pre-charging circuit and pre-charging method of high-voltage battery pack |
| CN109818393B (en) * | 2019-01-23 | 2020-05-19 | 宁德时代新能源科技股份有限公司 | Pre-charging circuit and pre-charging method of high-voltage battery pack |
| US11404894B2 (en) | 2019-01-23 | 2022-08-02 | Contemporary Amperex Technology Co., Limited | Pre-charging circuit and pre-charging method for high voltage battery pack |
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