CN219163472U - High-voltage power supply circuit and power device of battery pack - Google Patents
High-voltage power supply circuit and power device of battery pack Download PDFInfo
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- CN219163472U CN219163472U CN202223361442.8U CN202223361442U CN219163472U CN 219163472 U CN219163472 U CN 219163472U CN 202223361442 U CN202223361442 U CN 202223361442U CN 219163472 U CN219163472 U CN 219163472U
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Abstract
The utility model discloses a battery pack high-voltage power supply circuit and a power device, wherein the circuit comprises: a battery pack; the first end of the first power supply unit is connected with the positive electrode of the battery pack, and the first end of the second power supply unit is connected with the negative electrode of the battery pack; the pre-charging heating unit comprises a heating component, and is used for realizing the pre-charging function of the external capacitor based on the heating component after the second power supply unit is conducted, realizing the heating function of the battery pack based on the heating component when receiving a heating instruction, wherein the first end of the pre-charging heating unit is connected with the first end of the first power supply unit, the second end of the pre-charging heating unit is connected with the second end of the first power supply unit, and the third end of the pre-charging heating unit is connected with the second end of the second power supply unit.
Description
Technical Field
The application relates to the technical field of vehicle-mounted batteries, in particular to a high-voltage power supply circuit and a power device of a battery pack.
Background
Current high voltage battery power supply circuits are typically provided with a precharge circuit consisting of a precharge relay and a precharge resistor. Because there is the great external electric capacity of capacity in the external consumer, if there is not the precharge circuit, main positive contactor is at the closed moment, and the group battery charges for external electric capacity, is equivalent to short circuit condition, and main positive contactor can take place electric shock ablation or adhesion, leads to main positive contactor performance to reduce or direct scrap, therefore, through setting up precharge circuit, when high voltage power supply circuit is on, precharge circuit is precharged to external electric capacity earlier to avoid main positive contactor to take place electric shock ablation or adhesion.
However, for some battery packs with heating function, the number of relays in the BDU (Battery Disconnect Unit, battery cut-off unit) is excessive, the BDU is large in size, the occupied space in the pack is large, and the cost is high; the resistance of the pre-charge resistor is generally smaller, when a control system fault or external short circuit occurs, the pre-charge resistor is easy to burn out, and because the pre-charge resistor is installed in the BDU, the pre-charge resistor generally causes the BDU shell to deform and burn out when the pre-charge resistor burns out, and other surrounding components can be damaged, so that the whole BDU is scrapped.
Therefore, how to provide a high-voltage power supply circuit for a battery pack to reduce the cost of the BDU and improve the safety is a technical problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides a battery pack high-voltage power supply circuit and a power device, which are used for reducing the cost of BDU and improving the safety.
In a first aspect, there is provided a battery pack high voltage power supply circuit, the circuit comprising:
a battery pack;
the first end of the first power supply unit is connected with the positive electrode of the battery pack, and the first end of the second power supply unit is connected with the negative electrode of the battery pack;
the pre-charging heating unit comprises a heating component and is used for realizing the pre-charging function of an external capacitor based on the heating component after the second power supply unit is conducted, realizing the heating function of the battery pack based on the heating component when receiving a heating instruction, wherein the first end of the pre-charging heating unit is connected with the first end of the first power supply unit, the second end of the pre-charging heating unit is connected with the second end of the first power supply unit, and the third end of the pre-charging heating unit is connected with the second end of the second power supply unit.
In some embodiments, the pre-charge heating unit is in a first state when the pre-charge function is implemented and the pre-charge heating unit is in a second state when the heating function is implemented.
In some embodiments, the pre-charge heating unit comprises a switching relay, the switching relay is provided with a normally-open contact and a normally-closed contact, the pre-charge heating unit is in the first state when the normally-closed contact is closed and the normally-open contact is opened, and the pre-charge heating unit is in the second state when the normally-open contact is closed and the normally-closed contact is opened.
In some embodiments, the heating component is a heating film, one end of the heating component is a first end of the pre-charging heating unit, the other end of the heating component is connected with a common end of the normally open contact and the normally closed contact, the other end of the normally closed contact is connected with a second end of the pre-charging heating unit, and the other end of the normally open contact is connected with a third end of the pre-charging heating unit.
In some embodiments, the coil of the switching relay is connected to a battery management system.
In some embodiments, the pre-charge heating unit further comprises a first fuse connected in series at a first end of the pre-charge heating unit.
In some embodiments, the first power supply unit includes a main positive contactor, the second power supply unit includes a main negative contactor, a first end and a second end of the main positive contactor are a first end and a second end of the first power supply unit, respectively, and a first end and a second end of the main negative contactor are a first end and a second end of the second power supply unit, respectively.
In some embodiments, the coil of the primary positive contactor and the coil of the primary negative contactor are connected to a battery management system, respectively.
In some embodiments, the first power supply unit further includes a second fuse connected in series at a first end of the first power supply unit, and the second power supply unit further includes a current transformer connected in series at a first end of the second power supply unit.
In a second aspect, there is provided a power plant comprising a battery pack high voltage power supply circuit as described in the first aspect.
By applying the above technical scheme, the high-voltage power supply circuit of the battery pack comprises: a battery pack; the first end of the first power supply unit is connected with the positive electrode of the battery pack, and the first end of the second power supply unit is connected with the negative electrode of the battery pack; the pre-charging heating unit comprises a heating component, and is used for realizing the pre-charging function of the external capacitor based on the heating component after the second power supply unit is conducted, realizing the heating function of the battery pack based on the heating component when receiving a heating instruction, wherein the first end of the pre-charging heating unit is connected with the first end of the first power supply unit, the second end of the pre-charging heating unit is connected with the second end of the first power supply unit, and the third end of the pre-charging heating unit is connected with the second end of the second power supply unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a high-voltage power supply circuit of a battery pack according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a high-voltage power supply circuit of a battery pack according to another embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides a battery pack high-voltage power supply circuit, as shown in fig. 1, the circuit comprises:
a battery pack 10;
a first power supply unit 20 and a second power supply unit 30, a first end of the first power supply unit 20 is connected with the positive electrode of the battery pack 10, and a first end of the second power supply unit 30 is connected with the negative electrode of the battery pack 10;
the pre-charging heating unit 40 comprises a heating component, and is used for realizing a pre-charging function for an external capacitor based on the heating component after the second power supply unit 30 is conducted, realizing a heating function for the battery pack 10 based on the heating component when a heating instruction is received, wherein a first end of the pre-charging heating unit 40 is connected with a first end of the first power supply unit 20, a second end of the pre-charging heating unit 40 is connected with a second end of the first power supply unit 20, and a third end of the pre-charging heating unit 40 is connected with a second end of the second power supply unit 30.
In this embodiment, when the battery pack high-voltage power supply circuit is powered on, the second power supply unit 30 is turned on first, and at this time, the pre-charging heating unit 40 realizes the pre-charging function of the external capacitor based on the heating component, after the external capacitor is full, the pre-charging is completed, the first power supply unit 20 is turned on, and the battery pack high-voltage power supply circuit is powered on, in addition, the pre-charging heating unit 40 is shorted after the first power supply unit 20 is turned on, so that the heating component stops working. Upon receiving the heating command, the pre-charge heating unit 40 performs a heating function of the battery pack 10 based on the heating assembly. Because the pre-charging heating unit 40 can respectively realize the pre-charging function and the heating function based on the heating component, the pre-charging relay and the pre-charging resistor can be omitted, the size of the BDU is reduced, the cost of the BDU is reduced, meanwhile, the resistance value of the heating component is larger, the problem of burning out cannot occur, and the safety of the BDU is improved.
To ensure that the pre-charge heating unit 40 reliably implements both the pre-charge function and the heating function, in some embodiments of the present application, the pre-charge heating unit 40 is in a first state when implementing the pre-charge function and the pre-charge heating unit 40 is in a second state when implementing the heating function.
To ensure the reliability of the pre-charge heating unit 40, in some embodiments of the present application, as shown in fig. 2, the pre-charge heating unit 40 includes a switching relay K3, where the switching relay K3 is provided with a normally open contact and a normally closed contact, the pre-charge heating unit 40 is in a first state when the normally closed contact is closed and the normally open contact is opened, and the pre-charge heating unit 40 is in a second state when the normally open contact is closed and the normally closed contact is opened.
In order to ensure the reliability of the pre-charging heating unit 40, in some embodiments of the present application, as shown in fig. 2, the heating component R is a heating film, one end of the heating component R is a first end of the pre-charging heating unit 40, the other end of the heating component R is connected to a common end of a normally open contact and a normally closed contact, the other end of the normally closed contact is connected to a second end of the pre-charging heating unit 40, and the other end of the normally open contact is connected to a third end of the pre-charging heating unit 40.
In order to secure the reliability of the pre-charge heating unit 40, in some embodiments of the present application, as shown in fig. 2, the coil of the switching relay K3 is connected to the BMS (Battery Management System ).
In this embodiment, when the coil of the switching relay K3 is powered off, the normally closed contact is closed and the normally open contact is opened, and when the heating function needs to be started, the battery management system makes the coil of the switching relay K3 powered on, and the normally closed contact is opened and the normally open contact is closed.
In order to improve the reliability of the pre-charge heating unit 40, in some embodiments of the present application, as shown in fig. 2, the pre-charge heating unit 40 includes a first fuse FU1, and the first fuse FU1 is connected in series to a first end of the pre-charge heating unit 40.
In order to ensure the reliability of the first power supply unit 20 and the second power supply unit 30, in some embodiments of the present application, as shown in fig. 2, the first power supply unit 20 includes a main positive contactor K2, the second power supply unit 30 includes a main negative contactor K1, a first end and a second end of the main positive contactor K2 are a first end and a second end of the first power supply unit 20, respectively, and a first end and a second end of the main negative contactor K1 are a first end and a second end of the second power supply unit 30, respectively.
In order to secure reliability of the first power supply unit 20 and the second power supply unit 30, in some embodiments of the present application, as shown in fig. 2, the coil of the main positive contactor K2 and the coil of the main negative contactor K1 are connected to the BMS, respectively.
In this embodiment, the coils of the primary positive contactor K2 and the primary negative contactor K1 are connected to the BMS, respectively, so that the BMS reliably controls the primary positive contactor K2 and the primary negative contactor K1.
In order to improve the reliability of the circuit, in some embodiments of the present application, as shown in fig. 2, the first power supply unit 20 includes a second fuse FU2, the second fuse FU2 is connected in series to the first end of the first power supply unit 20, and the second power supply unit 30 includes a current transformer CT, and the current transformer CT is connected in series to the first end of the second power supply unit 30.
By applying the above technical scheme, the high-voltage power supply circuit of the battery pack comprises: a battery pack; the first end of the first power supply unit is connected with the positive electrode of the battery pack, and the first end of the second power supply unit is connected with the negative electrode of the battery pack; the pre-charging heating unit comprises a heating component, and is used for realizing the pre-charging function of the external capacitor based on the heating component after the second power supply unit is conducted, realizing the heating function of the battery pack based on the heating component when receiving a heating instruction, wherein the first end of the pre-charging heating unit is connected with the first end of the first power supply unit, the second end of the pre-charging heating unit is connected with the second end of the first power supply unit, and the third end of the pre-charging heating unit is connected with the second end of the second power supply unit.
The following describes the operation principle of the battery pack high-voltage power supply circuit in the embodiment of the present application with reference to fig. 2.
When the pre-charging function is needed, the main negative contactor K1 is closed, at the moment, the normally closed contact of the switching relay K3 is closed, and the current path is as follows: the method comprises the steps of a positive electrode of the battery pack 10, a second fuse FU2, a first fuse FU1, a heating component R, a switching relay K3, high-voltage output+ & gt, an external capacitor, high-voltage output- & gt, a main negative contactor K1, a current sensor CT and a negative electrode of the battery pack 10; after the BMS judges that the pre-charging is finished according to the voltage of the external capacitor, the main positive contactor K2 is closed and corresponds to a wire, the first fuse FU1, the heating component R and the switching relay K3 are short-circuited, and the heating component R stops working.
When the heating function needs to be realized:
if electricity is taken from the battery pack 10, the switching relay K3 is electrified, the normally open contact is closed, the normally closed contact is opened, and the current path is as follows: positive pole of the battery pack 10, second fuse FU2, first fuse FU1, heating component R, switching relay K3, main negative contactor K1, current sensor CT and negative pole of the battery pack 10;
if electricity is taken from the charging pile, the main positive contactor K2 needs to be closed, the switching relay K3 is electrified, the normally open contact is closed, the normally closed contact is opened, and the current path is as follows: high voltage output + → main positive contactor k2→ first fuse fu1→ heating element r→switching relay k3→high voltage output-.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of the utility model, "a plurality" means two or more, unless otherwise specifically and clearly defined.
In the present utility model, unless explicitly specified and limited otherwise, the terms "access", "connected", and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.
Claims (10)
1. A battery pack high voltage power supply circuit, the circuit comprising:
a battery pack;
the first end of the first power supply unit is connected with the positive electrode of the battery pack, and the first end of the second power supply unit is connected with the negative electrode of the battery pack;
the pre-charging heating unit comprises a heating component and is used for realizing the pre-charging function of an external capacitor based on the heating component after the second power supply unit is conducted, realizing the heating function of the battery pack based on the heating component when receiving a heating instruction, wherein the first end of the pre-charging heating unit is connected with the first end of the first power supply unit, the second end of the pre-charging heating unit is connected with the second end of the first power supply unit, and the third end of the pre-charging heating unit is connected with the second end of the second power supply unit.
2. The circuit of claim 1, wherein the pre-charge heating unit is in a first state when the pre-charge function is implemented and the pre-charge heating unit is in a second state when the heating function is implemented.
3. The circuit of claim 2, wherein the pre-charge heating unit includes a switching relay therein, the switching relay being provided with a normally open contact and a normally closed contact, the pre-charge heating unit being in the first state when the normally closed contact is closed and the normally open contact is open, the pre-charge heating unit being in the second state when the normally open contact is closed and the normally closed contact is open.
4. The circuit of claim 3, wherein the heating element is a heating film, one end of the heating element is a first end of the pre-charge heating unit, the other end of the heating element is connected to a common end of the normally open contact and the normally closed contact, the other end of the normally closed contact is connected to a second end of the pre-charge heating unit, and the other end of the normally open contact is connected to a third end of the pre-charge heating unit.
5. A circuit as claimed in claim 3, wherein the coil of the switching relay is connected to a battery management system.
6. The circuit of claim 1, wherein the pre-charge heating unit comprises a first fuse connected in series at a first end of the pre-charge heating unit.
7. The circuit of claim 1, wherein the first power supply unit comprises a main positive contactor and the second power supply unit comprises a main negative contactor, the first and second ends of the main positive contactor being the first and second ends of the first power supply unit, respectively, and the first and second ends of the main negative contactor being the first and second ends of the second power supply unit, respectively.
8. The circuit of claim 7, wherein the coil of the main positive contactor and the coil of the main negative contactor are each connected to a battery management system.
9. The circuit of claim 1, wherein the first power supply unit comprises a second fuse connected in series at a first end of the first power supply unit, the second power supply unit comprising a current transformer connected in series at a first end of the second power supply unit.
10. A power plant comprising a battery pack high voltage supply circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223361442.8U CN219163472U (en) | 2022-12-14 | 2022-12-14 | High-voltage power supply circuit and power device of battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223361442.8U CN219163472U (en) | 2022-12-14 | 2022-12-14 | High-voltage power supply circuit and power device of battery pack |
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| CN219163472U true CN219163472U (en) | 2023-06-09 |
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| CN202223361442.8U Active CN219163472U (en) | 2022-12-14 | 2022-12-14 | High-voltage power supply circuit and power device of battery pack |
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