Heating system for battery system of electric vehicle

Abstract

The utility model discloses a heating system for a battery system of an electric vehicle, and the heating system comprises at least one battery pack, the battery pack comprises at least two battery packs provided with heating assemblies, the battery packs are connected in series, and the heating assemblies are connected in series; the high-voltage box is connected with the battery pack and comprises a battery management system, and a relay and a current sensor which are connected with the battery pack; the battery pack is provided with a first connector connected with the heating assembly; the high-voltage box is provided with a second connector connected with the first connector, and a heating main positive relay and a heating main negative relay which are connected with the second connector; and the battery management system controls closing of the heating main positive relay and the heating main negative relay, so that the heating assembly obtains the total voltage of the battery pack through the first connector and the second connector to start heating. The two needle pins are adopted to simplify the line connection of the heating loop, reduce the number of connectors and cables, and further reduce the cost of the whole vehicle.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a heating system for an electric vehicle battery system. Background Art

[0002] Due to the large vehicle and load capacity of electric heavy-duty commercial vehicles, the required battery energy will be greater than that of ordinary electric passenger vehicles; the power battery capacity of general electric passenger vehicles is mostly below 100kWh, while the power battery capacity of electric commercial vehicles is generally around 300-400kWh, or even higher.

[0003] Most electric heavy-duty commercial vehicles currently on the market use multi-branch battery systems connected in parallel to provide energy to the vehicle's electrical terminals. Because multiple battery packs are combined, each with its own heating element (PTC, thermal resistor, etc.), which requires the total voltage of the battery system to provide operating voltage, each battery pack requires additional heating circuit cables, connectors, and other components.

[0004] Existing technical solutions, such as Figure 1 As shown, P1, P2, P3, and P4 are four independent battery packs respectively, among which: P1 contains battery BT1 and heating component TC1; P2 contains battery BT2 and heating component TC2; P3 contains battery BT3 and heating component TC3; P4 contains battery BT4 and heating component TC4; P1 and P2 are connected in series, P3 and P4 are connected in series, and the batteries of the two circuits are connected in series to H1. H1 is a high-voltage box, which contains battery management system BMS, relay S1, relay S2, relay S3, and current sensor MT1; relay S4 is the main positive relay for controlling the heating circuit, and relay S5 is the main negative relay for controlling the heating circuit; when the battery temperature is low and needs to be heated, the battery management system BMS controls the heating relays S4 and S5 to close, so that the heating components TC1 and TC2 obtain the total battery voltage through connectors J1 and J2 and start working; similarly, TC3 and TC4 start working through J3 and J4.

[0005] In the existing technical solution, connectors J1, J2, J3, and J4 are used in each battery pack, which causes waste in terms of materials for the entire vehicle; and connectors J2 and J4 need to be returned to the high-voltage box, which also increases the complexity of the circuit and the cost of the wiring harness. Summary of the Invention

[0006] The purpose of this application is to provide a heating system for an electric vehicle battery system, which simplifies the line connection of the heating circuit, reduces the use of connectors and cables, and further reduces the cost of the entire vehicle.

[0007] To achieve the above objectives, this application provides the following solutions:

[0008] In a first aspect, the present application provides a heating system for an electric vehicle battery system, comprising:

[0009] At least one battery pack, the battery pack comprising at least two battery packs provided with heating components, the battery packs being connected in series, and the heating components being connected in series;

[0010] A high-voltage box connected to the battery pack, the high-voltage box comprising: a battery management system, a relay connected to the battery pack, and a current sensor;

[0011] The heating system further comprises:

[0012] The battery pack is provided with a first connector connected to the heating assembly;

[0013] The high-voltage box is provided with a second connector connected to the first connector, a heating main positive relay and a heating main negative relay connected to the second connector;

[0014] The battery management system controls the closing of the heating main positive relay and the heating main negative relay so that the heating component obtains the total voltage of the battery pack through the first connector and the second connector to start heating.

[0015] Optionally, when there are more than two battery packs, the battery packs are connected in parallel to the relay of the high-voltage box.

[0016] Optionally, the high-voltage box is provided with at least two second connectors, which are respectively connected to the first connectors on the at least two battery packs.

[0017] Optionally, the at least two second connectors are connected in parallel to the heating main positive relay and the heating main negative relay.

[0018] Optionally, the high-voltage box is provided with at least two or more heating main positive relays and heating main negative relays, which are respectively connected to the at least two or more second connectors.

[0019] Optionally, the first connector and the second connector are both 2-pin pins.

[0020] Optionally, a temperature sensor is provided on the battery pack and connected to the battery management system. When the battery temperature is lower than a preset temperature, the temperature sensor outputs a signal to control the battery management system to heat the battery pack.

[0021] Optionally, the high-voltage box includes at least two relays, which are respectively connected to the at least two battery packs.

[0022] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0023] The present application provides a heating system for an electric vehicle battery system. By replacing the 1-pin connector in the prior art with a 2-pin connector, the line connection of the heating circuit is simplified, the use of connectors and cables is reduced, and the cost of the entire vehicle is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A circuit diagram of a heating system for a battery system of an electric vehicle in the prior art provided in an embodiment of the present application.

[0026] Figure 2 A circuit diagram of a heating system for an electric vehicle battery system provided in an embodiment of the present application.

[0027] Figure 3 A circuit diagram of a heating system for an electric vehicle battery system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] refer to Figure 2 As shown, the present application provides a heating system for an electric vehicle battery system. The battery system includes: a battery pack, which includes a battery pack P1 equipped with a heating component TC1 and a battery pack P2 equipped with a heating component TC2. Battery packs P1 and P2 are connected in series, and heating components TC1 and TC2 are connected in series. The positive and negative electrodes of the battery pack are connected to a relay S1 provided in a high-voltage box H1 via a current sensor MT1.

[0031] In this heating system, a first connector JA1 is provided on the battery pack P1 of the battery group, and a second connector JA3 is provided on the high-voltage box H1. The first connector JA1 and the second connector JA3 are connected in series. The second connector JA3 is connected to the heating main positive relay S4 and the heating main negative relay S5 provided in the high-voltage box H1. The heating main positive relay S4 is connected to the relay S1, and the heating main negative relay S5 is connected to the relay S3.

[0032] In an embodiment of the present application, when the battery temperature is too low and needs to be heated, the battery management system BMS provided inside the high-voltage box H1 controls the relay S1, relay S3, heating main positive relay S4 and heating main negative relay S5 to close, and the heating component TC1 and the heating component TC2 obtain the total voltage of the battery pack through the connector JA1 and the connector JA3, thereby starting the heating process.

[0033] refer to Figure 3 As shown, the present application provides a heating system for an electric vehicle battery system, the battery system comprising:

[0034] Two battery packs, each comprising a battery pack P1 equipped with a heating component TC1 and a battery pack P2 equipped with a heating component TC2, as well as a battery pack P3 equipped with a heating component TC3 and a battery pack P4 equipped with a heating component TC4. Battery packs P1 and P2 are connected in series, battery packs P3 and P4 are connected in series, heating components TC1 and TC2 are connected in series, and heating components TC3 and TC4 are connected in series. Relays S1 and S2 are provided in parallel in the high-voltage box H1. The positive poles of the two battery packs are connected to relays S1 and S2, respectively, and the negative poles are connected to current sensor MT1. In an exemplary embodiment, when the high-voltage box H1 has only one positive relay, the positive poles of the two battery packs are connected in parallel to the positive relay.

[0035] In this heating system, a first connector JA1 is provided on the battery pack P1 of the first battery group, and a second connector JA3 is provided on the high-voltage box H1. The first connector JA1 and the second connector JA3 are connected in series, and the second connector JA3 is connected to the main positive heating relay S4 and the main negative heating relay S5 provided in the high-voltage box H1. A third connector JA2 is provided on the battery pack P3 of the second battery group, and a fourth connector JA4 is provided on the high-voltage box H1. The third connector JA2 and the fourth connector JA4 are connected in series, and the third connector JA2 is connected to the main positive heating relay S4 and the main negative heating relay S5 provided in the high-voltage box H1. The first connector JA1 and the second connector JA3 are connected in parallel with the third connector JA2 and the fourth connector JA4.

[0036] In an embodiment of the present application, when the battery temperature is too low and needs to be heated, the battery management system BMS provided inside the high-voltage box H1 controls the relay S1, relay S2, relay S3, heating main positive relay S4 and heating main negative relay S5 to be closed, and the heating component TC1 and the heating component TC2 obtain the total voltage of the battery group through the connector JA1 and the connector JA3, and heat the first battery group (battery pack P1 and battery pack P2); the heating component TC3 and the heating component TC4 obtain the total voltage of the battery group through the connector JA2 and the connector JA4, and heat the second battery group (battery pack P3 and battery pack P4).

[0037] In the embodiments of this application, the first connector JA1, the second connector JA3, the third connector JA2, and the fourth connector JA4 all utilize two-pin pins. By using two-pin connectors, the heating circuit does not need to return to the high-voltage box after passing through battery packs P2 and P4, reducing cable connections. Furthermore, all connectors in the heating circuit utilize two-pin pins, further reducing connector usage and thus lowering vehicle costs.

[0038] In an embodiment of the present application, a temperature sensor is provided on the battery pack and connected to the battery management system. When the battery temperature is lower than a preset temperature, the temperature sensor outputs a signal to the battery management system so that the battery management system heating component controls the heating of the battery pack.

[0039] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A heating system for an electric vehicle battery system, comprising: At least one battery pack, the battery pack comprising at least two battery packs provided with heating components, the battery packs being connected in series, and the heating components being connected in series; A high-voltage box connected to the battery pack, the high-voltage box comprising: a battery management system, a relay connected to the battery pack, and a current sensor; It is characterized in that: the heating system also includes: The battery pack is provided with a first connector connected to the heating assembly; The high-voltage box is provided with a second connector connected to the first connector, a heating main positive relay and a heating main negative relay connected to the second connector; The battery management system controls the closing of the heating main positive relay and the heating main negative relay so that the heating component obtains the total voltage of the battery pack through the first connector and the second connector to start heating.

2. The heating system for an electric vehicle battery system according to claim 1, characterized in that: When there are more than two battery packs, the battery packs are connected in parallel to the relay of the high-voltage box.

3. The heating system for an electric vehicle battery system according to claim 2, characterized in that: The high-voltage box is provided with at least two second connectors, which are respectively connected to the first connectors on the at least two battery packs.

4. The heating system for an electric vehicle battery system according to claim 3, characterized in that: The at least two second connectors are connected in parallel to the heating main positive relay and the heating main negative relay.

5. The heating system for an electric vehicle battery system according to claim 3, characterized in that: The high-voltage box is provided with at least two or more heating main positive relays and heating main negative relays, which are respectively connected to the at least two or more second connectors.

6. The heating system for an electric vehicle battery system according to any one of claims 1 to 5, characterized in that: The first connector and the second connector are both 2-pin pins.

7. The heating system for an electric vehicle battery system according to any one of claims 1 to 5, characterized in that: The battery pack is provided with a temperature sensor connected to the battery management system. When the battery temperature is lower than a preset temperature, the temperature sensor outputs a signal to control the battery management system to heat the battery pack.

8. The heating system for an electric vehicle battery system according to claim 2, characterized in that: The high-voltage box includes at least two relays, which are respectively connected to the at least two battery packs.

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