CN212921140U - Multi-load pre-charging circuit - Google Patents
Multi-load pre-charging circuit Download PDFInfo
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- CN212921140U CN212921140U CN202021970786.7U CN202021970786U CN212921140U CN 212921140 U CN212921140 U CN 212921140U CN 202021970786 U CN202021970786 U CN 202021970786U CN 212921140 U CN212921140 U CN 212921140U
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Abstract
The utility model discloses a many loads pre-charge circuit, including a plurality of loads and a plurality of main relay, main relay and load one-to-one, power battery's positive pole is connected with the load one end that corresponds through main relay, and power battery's negative pole is connected to the other end of load, the pre-charge circuit still includes a pre-charge resistance R and a plurality of pre-charge relay, the pre-charge relay with the load one-to-one, power battery's positive pole is connected with pre-charge resistance R's one end, and pre-charge resistance R's the other end is connected with each pre-charge relay respectively, every the pre-charge relay corresponds the one end of connecting a load. The utility model has the advantages that: the structure is simple, the implementation is convenient, the multi-load pre-charging circuit can be conveniently implemented, and the cost can be saved.
Description
Technical Field
The utility model relates to an electric automobile battery field, in particular to multi-load pre-charging circuit of electric automobile battery.
Background
In the load system of the electric automobile, a plurality of loads contain bus capacitors. Because the capacitor is an energy storage element, a bus capacitor in a load needs to be charged at the initial stage of circuit closing, so that the current in the circuit is very large, and if the current is not limited, the circuit is damaged due to large current impact.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a many loads preliminary filling circuit, improve current preliminary filling circuit, make preliminary filling circuit adaptation many loads.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a many loads pre-charge circuit, includes a plurality of loads and a plurality of main relay, main relay and load one-to-one, power battery's positive pole is connected with the load one end that corresponds through main relay, and power battery's negative pole is connected to the other end of load, pre-charge circuit still includes a pre-charge resistance R and a plurality of pre-charge relay, pre-charge relay with the load one-to-one, power battery's positive pole is connected with pre-charge resistance R's one end, and pre-charge resistance R's the other end is connected with each pre-charge relay respectively, every the one end of a load is connected in pre-charge relay correspondence.
The pre-charging relay and the main machine relay are respectively connected with the main control unit, and the main control unit is used for controlling the on and off of the pre-charging relay and the main machine relay.
The main control unit is a control unit of a battery management system BMS.
The utility model has the advantages that: the structure is simple, the implementation is convenient, the multi-load pre-charging circuit can be conveniently implemented, and the cost can be saved; in the patent scheme, any load can be singly pre-charged and electrified by a single load R, and also can be pre-charged and electrified by multiple loads in sequence according to pre-designed electrifying logic. In the whole distribution circuit, no matter how many loads N of the whole vehicle reach, the pre-charging resistor R in the whole circuit is only used one, and the connected high-voltage wires are reduced, so that the resource utilization is obviously more prominent. The space size of the whole vehicle distribution box is reduced structurally, the space utilization rate is improved remarkably, and sharing and integration are embodied on products.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic circuit diagram of a pre-charge circuit according to the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
In the electric automobile, a power battery is an energy source of the whole system and provides electric energy for various high-voltage electric equipment, wherein the equipment comprises a motor controller, an air conditioner compressor, a DC/DC (direct current/direct current) and various pumps and the like. Because of the requirement of the working environment of the whole vehicle, the state has strict indexes on the electromagnetic interference of the whole vehicle, so that the high-voltage equipment has a filter circuit at the input end, and a bus capacitor (X capacitor) is a core component of the filter circuit. The bus capacitor is an energy storage element, and due to the existence of the bus capacitor, a power battery can generate large impact current when directly providing electric energy for electric equipment, and the impact current can cause mistaken fusing of a fuse or contact adhesion of a relay. The pre-charging circuit is added in the current finished automobile circuit, but the number of pre-charging resistors and the number of loads are multiplied with the increase of electric loads of the finished automobile, so that the circuit of a finished automobile power distribution system is complex, the space utilization rate of an accessory box is low, and the cost of the whole system is increased. In order to solve the problem, the pre-charging circuit is realized by adopting one resistor, so that the line connection cost and the high-voltage wiring harness cost are reduced, and the space cost can be reduced.
As shown in fig. 1, a multi-load pre-charging circuit includes a plurality of loads and a plurality of main relays, wherein the main relays correspond to the loads one by one, and the number of the main relays is the same as that of the loads; the pre-charging circuit also comprises a pre-charging resistor R and a plurality of pre-charging relays, the pre-charging relays correspond to the loads one by one, and the number of the pre-charging relays is the same as that of the loads; the positive pole of the power battery is connected with one end of a corresponding load through a main relay, and the other end of the load is connected with the negative pole of the power battery, so that a main loop of the positive pole of the power battery, the main relay, the load and the negative pole of the power battery is formed; the positive pole of the power battery is connected with one end of a pre-charging resistor R, the other end of the pre-charging resistor R is respectively connected with each pre-charging relay, each pre-charging relay is correspondingly connected with one end of a load, and the other end of the load is connected with the negative pole of the power battery, so that a pre-charging loop of the positive pole of the power battery, the resistor R, the pre-charging relays, the load and the negative pole of the power battery is realized.
The pre-charging relay and the main machine relay are respectively connected with a control unit of the battery management system BMS, and the control unit of the battery management system BMS is used for controlling the opening and closing of the pre-charging relay and the main machine relay so as to control the opening and closing of the pre-charging circuit and the power-on closing and opening of the main loop.
As shown in fig. 1, the circuit of the present embodiment includes an integer number of loads (loads 1 to N, respectively), an integer number of pre-charge relays K (pre-charge relays K1 to N, respectively), an integer number of main relays KM (KM1 to N), and 1 pre-charge resistor R in the pre-charge circuit. The number of the pre-charging relays K is the same as that of the main relays.
The input ends of a plurality of pre-charging relays K (1-N) are connected in parallel, and the parallel connection is connected with one end of a pre-charging resistor R. The input ends of a plurality of main relays KM (1-N) are mutually connected in parallel, and the parallel point is connected with the other end of the pre-charging resistor and finally connected to the anode of the power battery. The output end of any pre-charging relay KN is connected with the output end KMN of the corresponding main relay in parallel, the parallel connection point is finally connected to an internal circuit of the corresponding load N, the branch line inside the load N is connected with one end of a bus capacitor CN, the other end of the bus capacitor CN is connected with the output end KMN of the load in parallel, an integral number of load (1-N) output ends are all connected in parallel after the load is discharged, the parallel connection point is finally connected with the negative electrode of a power battery, and the circuit is shown in figure 1.
In the scheme, the number of the pre-charging resistors R is not increased along with the increase of the number of the loads, one pre-charging resistor is used for completing multi-load pre-charging of the whole system circuit, and single pre-charging of a certain load can be performed in the pre-charging process, and sequential pre-charging of multiple loads can also be performed.
When a certain load N needs to be electrified, the pre-charging relay KN in the pre-charging circuit corresponding to the load is firstly attracted, the whole circuit is conducted, and the current in the circuit is limited due to the existence of the pre-charging resistor RN, so that the design index is met. After the pre-charging is finished, the corresponding main relay KMN is attracted, the pre-charging relay KN is disconnected after the main relay KMN is attracted, and the whole circuit is electrified to be finished. However, in the existing scheme, the number of the pre-charging resistors R is the same as that of the pre-charging relays KN, the whole system is too complex, and the structure and the cost are not advantageous.
According to the multi-load pre-charging scheme, any load in the scheme can be pre-charged and electrified separately, and multi-load pre-charging and electrifying can be carried out sequentially according to pre-designed electrifying logic. In the whole distribution circuit, no matter how many loads N of the whole vehicle reach, the pre-charging resistor R in the whole circuit is used for only one, and the number of connected high-voltage wires is reduced. Compared with the existing N pre-charging resistor schemes, the method is obviously more outstanding in resource utilization. The space size of the whole vehicle distribution box is reduced structurally, the space utilization rate is improved remarkably, and sharing and integration are embodied on products.
The control of preliminary filling generally adopts BMS to control the closure of preliminary filling relay and realizes the preliminary filling process, generally adopts the following control mode:
(1) any load N is powered up separately.
When a certain load N needs to be electrified, the pre-charging relay KN in the pre-charging circuit corresponding to the load is firstly attracted, the whole circuit is conducted, and the current in the circuit is limited due to the existence of the pre-charging resistor R, so that the design index is met. After the pre-charging is finished, the corresponding main relay KMN is attracted, the pre-charging relay KN is disconnected after the main relay KMN is attracted, and the whole circuit is electrified to be finished.
(2) Multi-load pre-charge power-up
When multiple loads need to be powered on, any load can be set as a first pre-charging sequence according to design requirements, and other loads are sequentially arranged backwards according to the setting (the arrangement sequence of different loads according to projects can also be different). Assume that the precharge sequence of the present scheme is load 1 → load 2 … … load N in that order. The method comprises the steps that firstly, a load 1 is attracted to a pre-charging relay K1 in a corresponding pre-charging circuit, the whole circuit is conducted, due to the existence of a pre-charging resistor R, the circuit in the circuit is limited to meet design indexes, after pre-charging is completed, a corresponding main relay KM1 is attracted, after the main relay KM1 is attracted, a pre-charging relay K1 is disconnected, the load 1 and charging are completed, and the load 2 enters a pre-charging link.
When the K1 is switched off, the pre-charging relay K2 in the pre-charging circuit corresponding to the load 2 is attracted, the whole circuit is conducted, due to the existence of the pre-charging resistor R, the circuit in the circuit is limited to meet the design index, the corresponding main relay KM2 is attracted after the pre-charging is finished, the pre-charging relay K2 is switched off after the main relay KM2 is attracted, and the circuit of the whole load 2 is electrified. The pre-charging of the loads 3 to N is performed in sequence as described above.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (3)
1. The utility model provides a many loads are circuit in advance, includes a plurality of loads and a plurality of main relay, main relay and load one-to-one, power battery's positive pole is connected with the load one end that corresponds through main relay, and power battery's negative pole, its characterized in that are connected to the other end of load: the pre-charging circuit further comprises a pre-charging resistor R and a plurality of pre-charging relays, the pre-charging relays correspond to the loads one to one, the anode of the power battery is connected with one end of the pre-charging resistor R, the other end of the pre-charging resistor R is connected with each pre-charging relay respectively, and each pre-charging relay is correspondingly connected with one end of one load.
2. A multi-load pre-charge circuit as in claim 1, wherein: the pre-charging relay and the main machine relay are respectively connected with the main control unit, and the main control unit is used for controlling the on and off of the pre-charging relay and the main machine relay.
3. The multi-load pre-charge circuit of claim 2, wherein the main control unit is a control unit of a Battery Management System (BMS).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021970786.7U CN212921140U (en) | 2020-09-10 | 2020-09-10 | Multi-load pre-charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021970786.7U CN212921140U (en) | 2020-09-10 | 2020-09-10 | Multi-load pre-charging circuit |
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| CN212921140U true CN212921140U (en) | 2021-04-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113459812A (en) * | 2021-07-09 | 2021-10-01 | 山东元齐新动力科技有限公司 | Pre-charging device, power battery and pre-charging method |
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- 2020-09-10 CN CN202021970786.7U patent/CN212921140U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113459812A (en) * | 2021-07-09 | 2021-10-01 | 山东元齐新动力科技有限公司 | Pre-charging device, power battery and pre-charging method |
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