CN219716953U

CN219716953U - Battery system of electric vehicle and electric vehicle

Info

Publication number: CN219716953U
Application number: CN202320696465.XU
Authority: CN
Inventors: 张鹤; 黄莹; 郑剑
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-09-19
Anticipated expiration: 2033-03-31

Abstract

The utility model provides a battery system of an electric vehicle and the electric vehicle, and relates to the field of batteries.

Description

Battery system of electric vehicle and electric vehicle

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery system of an electric vehicle and the electric vehicle.

Background

The electric automobile is a vehicle driven by power provided by a power battery, and the power battery of the electric automobile is used as the power output of the whole automobile, so that the advantages of long endurance mileage, high discharge energy efficiency and the like are required to be met. However, the battery performance of the power battery has a great relation with the ambient temperature, and in the debugging stage of the electric automobile, the situation that the power battery cannot be charged or discharged in a low-temperature environment can occur.

The conventional power battery testing mode is generally that a personal computer (Personal Computer, PC) is connected with a controller local area network (Controller Area Network, CAN) line of a power battery system, so that interaction is carried out with a battery manager (Battery Management System, BMS) of the power battery, and temperature offset is changed on an upper computer to debug, but some BMS manufacturers at present do not support the function, only CAN pass bench test, the battery testing process is complex, and whether the whole vehicle end function of an electric vehicle is normal cannot be actually tested.

Disclosure of Invention

The utility model provides a battery system of an electric vehicle and the electric vehicle, which can effectively detect whether the charge and discharge power and the heating of a battery in the electric vehicle are normal at low temperature, and the test method is simple and quick, so that the vehicle acceptance efficiency can be improved.

In a first aspect, the utility model provides a battery system of an electric vehicle, which comprises a battery manager, a heating device, a power battery and a storage battery, wherein the heating device, the power battery and the storage battery are connected with the battery manager, at least two control pins of the battery manager are respectively connected with the positive electrode of the storage battery through at least two control switches, and a grounding pin of the battery manager is connected with the negative electrode of the storage battery;

the storage battery is used for providing at least two different enabling signals to the battery manager when the at least two control switches are closed or opened;

the battery manager is used for receiving at least two different enabling signals and respectively controlling the heating device to heat the power battery according to at least two different target temperatures in response to the at least two different enabling signals;

the battery manager is further configured to detect a battery parameter of the power battery during the heating process of the power battery, and determine whether the power battery is heated normally according to the battery parameter, where the battery parameter includes a temperature and a power of the power battery.

In one possible implementation of the present utility model, the at least two control switches include a first control switch and a second control switch;

the two ends of the first control switch are respectively connected with a first control pin of the battery manager and the positive electrode of the storage battery, and the first control switch is used for controlling the connection or disconnection between the first control pin of the battery manager and the positive electrode of the storage battery;

and two ends of the second control switch are respectively connected with a second control pin of the battery manager and the positive electrode of the storage battery, and the second control switch is used for controlling the connection or disconnection between the second control pin of the battery manager and the positive electrode of the storage battery.

In one possible implementation manner of the present utility model, when both the first control switch and the second control switch are turned off, the storage battery provides a first enabling signal for the battery manager, and the first enabling signal is used for enabling the battery manager to control the heating device to heat the power battery according to a first target temperature;

when the first control switch is closed and the second control switch is opened, the storage battery provides a second enabling signal for the battery manager, and the second enabling signal is used for enabling the battery manager to control the heating device to heat the power battery according to a second target temperature;

when the first control switch is turned off and the second control switch is turned on, the storage battery provides a third enabling signal for the battery manager, and the third enabling signal is used for enabling the battery manager to control the heating device to heat the power battery according to a third target temperature;

when the first control switch and the second control switch are both closed, the storage battery provides a fourth enabling signal for the battery manager, and the fourth enabling signal is used for enabling the battery manager to control the heating device to heat the power battery according to a fourth target temperature.

In one possible implementation manner of the present utility model, the battery manager includes a battery parameter reading module, a battery parameter detecting module, a heating normal determining module and a heating abnormal determining module;

the battery parameter reading module is used for reading the battery parameters of the power battery, and setting indexes and test duration for the battery parameters;

the battery parameter detection module is used for detecting the battery parameter of the power battery in the process of heating the power battery;

the heating normal determining module is configured to determine that the power battery is heated normally if the value of the battery parameter meets the index before the test duration is reached;

and the heating abnormality determining module is used for determining that the power battery is abnormal in heating if the numerical value of the battery parameter does not accord with the index when the test duration is reached.

In one possible implementation of the present utility model, the battery system further includes at least one heating control switch connected to the power battery, the heating device and the battery manager, and the heating control switch is used for controlling the power battery to be disconnected from the heating device or connected for a certain period of time under the control of the battery manager.

In one possible implementation of the present utility model, the battery system further includes a current detection device connected to the power battery and the battery manager, and the current detection device is configured to detect a current in a connection loop between the power battery and the heating control switch, and feed back the current to the battery manager.

In one possible implementation manner of the present utility model, the battery system further includes a charge-discharge control switch connected to the power battery and the battery manager, where the charge-discharge control switch is used to control the power battery to delay to disconnect power supply under the control of the battery manager.

In one possible implementation of the present utility model, the battery system further includes a thermal fusing device connected to the heating device and the power battery, the thermal fusing device being configured to fuse when a temperature heated by the heating device exceeds a temperature threshold, so as to disconnect the power battery from the heating device.

In one possible implementation of the utility model, the heating means comprises a variable resistance heating element or a constant resistance heating element.

In a second aspect, the present utility model provides an electric vehicle comprising a battery system of the electric vehicle according to the first aspect.

When at least two control switches are turned on or off, at least two different enabling signals are provided for a battery manager through a storage battery, the battery manager receives the at least two different enabling signals and responds to the at least two different enabling signals, a heating device is controlled to heat a power battery according to at least two different target temperatures respectively, battery parameters of the power battery are detected in the heating process of the power battery, and whether the power battery is heated normally is determined according to the battery parameters; the battery system of the electric vehicle can automatically detect and heat and debug the power battery at low temperature at the whole vehicle end, the testing method is simple and quick, the batch heating and debugging of the power battery of the electric vehicle are convenient to realize, and the vehicle acceptance efficiency can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an embodiment of a battery system of an electric vehicle according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an embodiment of a battery system of an electric vehicle according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of an embodiment of a battery manager according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of an embodiment of an electric vehicle according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be understood that 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 number of technical features indicated. Thus, a feature defining "a first", "a second" or the like may include one or more of the stated features, either explicitly or implicitly. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment of the utility model that is described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the utility model with unnecessary detail. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

The embodiment of the utility model provides a battery system of an electric vehicle and the electric vehicle, and the battery system and the electric vehicle are respectively described in detail below.

As shown in fig. 2, a schematic structural diagram of an embodiment of a battery system of an electric vehicle according to the present utility model includes a battery manager 1, a heating device 2 connected to the battery manager 1, a power battery 3 and a storage battery 4, at least two control pins of the battery manager 1 are respectively connected to an anode of the storage battery 4 through at least two control switches 5, and a ground pin of the battery manager 1 is connected to a cathode of the storage battery 4.

The battery manager 1 (Battery Management System, BMS) intelligently manages and maintains each battery cell in the electric system of the electric vehicle, prevents the battery from being overcharged and overdischarged, prolongs the service life of the battery, and monitors the state of the battery.

The heating device 2 is a device that heats the power battery 3, and in this embodiment, the heating device 2 includes a variable resistance heating element or a constant resistance heating element. Variable resistance heating elements are commonly referred to as PTC (positive temperature coefficient), while constant resistance heating elements are heating films typically composed of metal heating wires, such as silicone heating films, flexible electrical heating films, and the like.

The power battery 3 is a power source for supplying power to the vehicle, and is a storage battery for supplying power to the electric car in a multi-finger manner. In this embodiment, the power battery 3 is a valve port sealed lead-acid battery, an open tubular lead-acid battery, and a lithium iron phosphate battery.

The storage battery 4 may be a battery in an electric vehicle for supplying power to other devices, for example, the storage battery 4 for supplying power to lighting devices in the electric vehicle, which is not particularly limited in this embodiment, and the storage battery 4 simultaneously supplies power to the battery manager 1.

The control switch 5 may be any switch capable of controlling connection and disconnection between the battery manager 1 and the storage battery 4, such as a single pole double throw switch, a double pole double throw switch, etc., and the embodiment is not particularly limited thereto.

In the battery system of the electric vehicle of the present utility model:

the storage battery 4 is used for providing at least two different enabling signals to the battery manager 1 when at least two control switches 5 are closed or opened;

for example, the voltage of the storage battery 4 may be 24V, and the storage battery 4 may provide two level signals of 0V and 24V, when at least two control switches 5 are closed, the storage battery 4 provides a low level signal of 0V to at least two control pins of the battery manager 1, at this time, the at least two low level signals together form an enable signal for triggering the battery manager 1 to operate, and because there is a difference in the structure of the storage battery 4, the manner of controlling the storage battery 4 to send the enable signal to the battery manager 1 is also different, which is not limited in this embodiment.

The battery manager 1 is configured to receive at least two different enable signals, and control the heating device 2 to heat the power battery 3 according to at least two different target temperatures in response to the at least two different enable signals;

the battery manager 1 is further configured to detect a battery parameter of the power battery 3 during the heating process of the power battery 3, and determine whether the power battery 3 is heated normally according to the battery parameter, where the battery parameter includes a temperature and a power of the power battery 3.

That is, in the present embodiment, the battery manager 1 incorporates therein a program for testing the heating function of the power battery 3, i.e., a test program, also referred to as a test case. Some parameters of the test program are adjustable, and a technician adjusts the parameters according to different test requirements before testing, for example, when testing the heating function of the power battery 3 of different types, the parameters of the test program are adjusted according to the type of the power battery 3, or when testing the heating function of the power battery 3 in different room temperature environments, the parameters of the test program are adjusted according to the room temperature environments, etc.

In the utility model, when at least two control switches 5 are turned on or off, at least two different enabling signals are provided for the battery manager 1 through the storage battery 4, the battery manager 1 receives the at least two different enabling signals and respectively controls the heating device 2 to heat the power battery 3 according to the at least two different target temperatures in response to the at least two different enabling signals, battery parameters of the power battery 3 are detected in the heating process of the power battery 3, and whether the power battery 3 is heated normally is determined according to the battery parameters; the battery system of the electric vehicle provided by the utility model can automatically detect and heat and debug the charge and discharge power of the power battery 3 at low temperature at the whole vehicle end, and the test method is simple and quick, is convenient for realizing batch heating and debugging of the power battery 3 of the electric vehicle, and can improve the vehicle acceptance efficiency.

In some embodiments of the present utility model, as shown in fig. 2, at least two control switches 5 include a first control switch 51 and a second control switch 52;

the two ends of the first control switch 51 are respectively connected with the first control pin GPIO1 of the battery manager 1 and the positive electrode of the storage battery 4, and the first control switch 51 is used for controlling the connection or disconnection between the first control pin GPIO1 of the battery manager 1 and the positive electrode of the storage battery 4;

both ends of the second control switch 52 are respectively connected with the second control pin GPIO2 of the battery manager 1 and the positive electrode of the storage battery 4, and the second control switch 52 is used for controlling the connection or disconnection between the second control pin GPIO2 of the battery manager 1 and the positive electrode of the storage battery 4.

In the present embodiment, since the storage battery 4 has been connected to the first control pin GPIO1, the second control pin GPIO2, and the ground pin GND of the battery manager 1, respectively, at the time of vehicle production, a technician does not need to wire the storage battery 4 and the battery manager 1 at the time of the heating test, simplifying the test process, so as to improve the test efficiency.

In the present embodiment, when both the first control switch 51 and the second control switch 52 are turned off, the storage battery 4 provides the battery manager 1 with a first enable signal for causing the battery manager 1 to control the heating device 2 to heat the power battery 3 according to the first target temperature;

when the first control switch 51 is closed and the second control switch 52 is opened, the storage battery 4 provides a second enabling signal for the battery manager 1, and the second enabling signal is used for enabling the battery manager 1 to control the heating device 2 to heat the power battery 3 according to a second target temperature;

when the first control switch 51 is opened and the second control switch 52 is closed, the storage battery 4 provides a third enabling signal for the battery manager 1, and the third enabling signal is used for enabling the battery manager 1 to control the heating device 2 to heat the power battery 3 according to a third target temperature;

when both the first control switch 51 and the second control switch 52 are closed, the storage battery 4 provides a fourth enable signal to the battery manager 1, and the fourth enable signal is used to enable the battery manager 1 to control the heating device 2 to heat the power battery 3 according to a fourth target temperature.

In this embodiment, when the heating function of the power battery 3 is started to be tested, the first control switch 51 and the second control switch 51 may be correspondingly controlled to be opened or closed according to the temperature requirement, so as to control the battery manager 1 to simulate different heating temperatures, and it should be noted that the first target temperature, the second target temperature, the third target temperature and the fourth target temperature may be any values manually preset, which is not limited in this embodiment.

For the sake of easy understanding, the case of this embodiment will be further described with respect to the case where the battery 4 is a 24V battery.

(1) The first control switch 51 and the second control switch 52 are manually controlled to be turned off, and the first control pin GPIO1 and the second control pin GPIO2 of the battery manager 1 are both input with low level signals of 0V, at this time, a first enable signal is generated in the battery manager 1 according to the low level signals input by the first control pin GPIO1 and the second control pin GPIO2, and the heating device 2 is controlled to heat the power battery 3 according to the simulated temperature of the first target temperature in response to the first enable signal, for example, the first target temperature may be 0 degrees celsius, or may be other temperatures, which is not limited in this embodiment specifically.

(2) The first control switch 51 is manually controlled to be closed, and the second control switch 52 is simultaneously controlled to be opened, the first control pin GPIO1 of the battery manager 1 inputs a high level signal of 24V, the second control pin GPIO2 inputs a low level signal of 0V, at this time, a second enabling signal is generated in the battery manager 1 according to the high level signal input by the first control pin GPIO1 and the low level signal input by the second control pin GPIO2, and the heating device 2 is controlled to heat the power battery 3 according to an analog temperature of a second target temperature in response to the second enabling signal, for example, the second target temperature may be (+5%) degrees celsius, or may be other temperatures, which is not particularly limited in this embodiment.

(3) The first control switch 51 is manually controlled to be opened, the second control switch 52 is simultaneously controlled to be closed, the first control pin GPIO1 of the battery manager 1 inputs a low level signal of 0V, the second control pin GPIO2 inputs a high level signal of 24V, at this time, a third enabling signal is generated in the battery manager 1 according to the low level signal input by the first control pin GPIO1 and the high level signal input by the second control pin GPIO2, and the heating device 2 is controlled to heat the power battery 3 according to an analog temperature of a third target temperature in response to the third enabling signal, for example, the third target temperature may be (+ 15) celsius degrees, or may be other temperatures, which is not particularly limited in this embodiment.

(4) The first control switch 51 and the second control switch 52 are both manually controlled to be closed, and the first control pin GPIO1 and the second control pin GPIO2 of the battery manager 1 are both input with 24V high level signals, at this time, a fourth enable signal is correspondingly generated in the battery manager 1 according to the high level signals input by the first control pin GPIO1 and the second control pin GPIO2, and the heating device 2 is controlled to heat the power battery 3 according to the simulated temperature of the fourth target temperature in response to the fourth enable signal, for example, the fourth target temperature may be (+ 20) celsius degrees, or may be other temperatures, which is not limited in particular in this embodiment.

That is, by the states of the first control switch 51 and the second control switch 52, it is judged whether the heating function of the battery at different low temperatures is normal, and it is possible to judge whether the charge and discharge power is logical.

In this embodiment, the at least two control switches 5 may further include more than two control switches 5, and correspondingly, the simulated temperature at which the battery manager 1 controls the heating device 2 to heat the power battery 3 may also include more different temperatures, where the number of control switches 5 and the numerical value of the simulated temperature are not specifically limited.

In some embodiments of the present utility model, as shown in fig. 3, the battery manager 1 includes a battery parameter reading module 11, a battery parameter detecting module 12, a heating normal determining module 13, and a heating abnormality determining module 14;

the battery parameter reading module 11 is configured to read a battery parameter of the power battery 3, and an index and a test duration set for the battery parameter.

In this embodiment, the power battery 3 has a plurality of battery parameters related to the heating function, one or more battery parameters may be selected for testing, the testing is a continuous operation process, the testing duration may be configured according to the testing requirement, during the heating process, the battery parameters to be tested may change, and the target of the change in the testing duration is the index.

In a test procedure built in the complete battery manager 1, the battery parameters of the power battery 3, the indexes set by the battery parameters and the test duration are related to each other, and the indexes and the test duration are adjustable under the condition of the established battery parameters, so that the battery parameters, the indexes set by the battery parameters and the test duration can be recorded in the form of a configuration file extensible markup language (ExtensibeMarkupLanguage, XML) and the like, and the adjustment is convenient.

In this embodiment, the battery parameter may include the temperature of the power battery 3, and the index set for the temperature includes a first threshold value, that is, the temperature reaches the first threshold value; the battery parameters may also include a temperature rise amplitude of the power battery 3, and correspondingly, the index set for the temperature rise amplitude includes a second threshold value, that is, the temperature rise amplitude reaches the first threshold value; the battery parameters may also include the power of the power battery 3, and the corresponding indicators set for the temperature include a third threshold value, i.e. the power reaches the third threshold value; the battery parameters may also include a variation amplitude of voltage, a variation amplitude of current, and the like, which is not particularly limited in this embodiment.

The battery parameter detection module 12 is configured to detect a battery parameter of the power battery 3 during a heating process of the power battery 3.

In the present embodiment, the battery parameter of the power is detected by the battery parameter detection module 12 in the battery manager 1, for example, the battery parameter includes the temperature of the power battery 3, that is, the value of the temperature (i.e., the temperature value) detected by the battery parameter detection module 12 on the power battery 3 during the heating of the power battery 3.

For another example, the battery parameters include the power of the power battery 3, that is, the value of the temperature detected by the battery parameter detecting module 12 on the power battery 3 during the heating process of the power battery 3, and the power value corresponding to the current temperature of the power battery 3 is obtained by inquiring the power-temperature table, where the power-temperature table may be a linear relation table formed by the temperature and the power of the power battery 3 and is preset according to experience, and the preset power-temperature table is led into the battery manager 1 before the test.

In the present embodiment, the battery parameter detection module 12 may also detect battery parameters by detecting the magnitude of change in the voltage, the magnitude of change in the current, and the like of the power battery 3, which is not particularly limited in the present embodiment.

And the heating normal determining module 13 is configured to determine that the power battery 3 is heated normally if the value of the battery parameter meets the index before the test duration is reached.

The heating normal determination module 13 continuously determines whether the value of the battery parameter meets the index during the timing test duration, and if so, indicates that the expected result of the test is reached, and determines that the heating function test on the power battery 3 is normal at present.

For example, before the test duration is reached, if the value of the temperature of the power battery 3 is equal to the first threshold value, it is determined that the power battery 3 is heated normally; for another example, before the test period is reached, if the value of the temperature increase amplitude of the power battery 3 is equal to the second threshold value, it is determined that the power battery 3 is heated normally.

And the heating abnormality determining module 14 is configured to determine that the power battery 3 is abnormally heated if the value of the battery parameter does not meet the index when the test duration is reached.

The heating abnormality determination module 14 continuously determines whether the values of the battery parameters meet the indexes during the timing test period, and if not, determines that the expected result of the test is not reached, and determines that the heating function test of the power battery 3 is abnormal at present.

For example, when the test duration is reached, if the value of the temperature of the power battery 3 is smaller than the first threshold value, determining that the power battery 3 is abnormally heated; for another example, when the test period is reached, if the value of the temperature increase amplitude of the power battery 3 is smaller than the second threshold value, it is determined that the power battery 3 is abnormally heated.

In some embodiments of the present utility model, the battery system further comprises a current detection device 7 connected to the power battery 3, the heating control switch 6 and the battery manager 1, wherein the current detection device 7 is configured to detect a current in a connection loop of the power battery 3 and the heating control switch 6, and feed back the current to the battery manager 1.

In this embodiment, the current detecting device 7 may include a hall sensor, as shown in fig. 2, an input end of the hall sensor is connected to a charge-discharge output circuit of the power battery 3, and an output end of the hall sensor is connected to the battery manager 1. The battery manager 1 outputs the current in the loop of the connection between the power battery 3 and the heating control switch 6 by detecting the voltage of the output end of the Hall sensor and according to the resistance value in the loop of the charge and discharge of the power battery 3; the battery manager 1 is convenient to judge whether the connection loop of the power battery 3 and the heating control switch 6 is abnormal according to the detected current, so that whether the power battery 3 is abnormal is further judged.

In this embodiment, the battery detection device may further include a shunt resistor or other devices capable of detecting current, which is not specifically limited in this embodiment.

Further, in order to secure the safety of various circuit devices in the battery system of the electric vehicle during the heating of the power battery 3 by the heating device 2, some protection devices may be provided to protect some circuit devices related to the heating device 2.

Thus, in some embodiments of the utility model, the battery system further comprises at least one heating control switch 6 connected to the power battery 3, the heating device 2 and the battery manager 1, the heating control switch 6 being adapted to control the power battery 3 to be disconnected from the heating device 2 or to be connected for a certain period of time under the control of the battery manager 1.

In this embodiment, the at least one heating control switch 6 may include at least one relay, for example, may include a heating positive relay 61 and a heating negative relay 62, two switch pins of the heating positive relay 61 are connected with the positive poles of the heating device 2 and the power battery 3, respectively, two controlled pins of the heating positive relay 61 are connected with the battery manager 1, two switch pins of the heating negative relay 62 are connected with the negative poles of the heating device 2 and the power battery 3, respectively, and two controlled pins of the heating negative relay 62 are connected with the battery manager 1.

In this embodiment, by presetting the threshold value of the on-time of the heating device 2 in the battery manager 1, during the process of testing the power battery 3, the battery manager 1 controls at least one heating control switch 6 to be in the closed state according to the set on-time, so that the heating device 2 heats the power battery 3, and when the threshold value of the on-time is reached, the battery manager 1 controls the heating positive relay 61 and the heating negative relay 62 to be automatically turned off, so as to stop the heating device 2 from heating.

In some embodiments of the present utility model, the battery system further comprises a thermal fusing device 8 connected to the heating device 2 and the power battery 3, the thermal fusing device 8 being configured to fuse when the temperature heated by the heating device 2 exceeds a temperature threshold, so as to disconnect the power battery 3 from the heating device 2.

In this embodiment, the heating and fusing device 8 may include a fuse, and by presetting a temperature threshold value of a connection loop between the heating device 2 and the power battery 3 in the battery manager 1, the battery manager 1 simultaneously detects the temperature of the heating device 2 during the process of testing the power battery 3, and when the heating temperature of the heating device 2 exceeds the temperature threshold value, the fuse is fused to forcibly disconnect the connection loop between the heating device 2 and the power battery 3, so as to avoid burning out or damaging other components in the battery system due to excessive loop temperature.

In some embodiments of the present utility model, the battery system further comprises a charge-discharge control switch 9 connected to the power battery 3 and the battery manager 1, wherein the charge-discharge control switch 9 is used for controlling the power battery 3 to be powered off in a delayed manner under the control of the battery manager 1.

In this embodiment, the charge-discharge control switch 9 may include a charge-discharge relay, two switch pins of which are respectively connected to the negative electrode of the power battery 3 and the charge-discharge negative electrode of the battery system for charging and discharging outwards, and two controlled pins of which are connected to the battery manager 1.

In this embodiment, the battery manager 1 controls the connection or disconnection of the contacts in the charge-discharge relay to control the connection or disconnection of the circuit for charging and discharging the power battery 3 outwards, so as to avoid the problem that other devices of the electric vehicle are damaged due to high temperature or failure of the power battery 3, and play a role in protecting other devices in the electric vehicle.

In some embodiments of the present utility model, the present utility model provides an electric vehicle, as shown in fig. 4, including a battery system of the electric vehicle as described above.

The above description of the battery system of the electric vehicle and the electric vehicle provided by the embodiment of the utility model applies specific examples to describe the principle and implementation of the utility model, and the description of the above examples is only used for helping to understand the method and core idea of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims

1. The battery system of the electric vehicle is characterized by comprising a battery manager, a heating device, a power battery and a storage battery, wherein the heating device, the power battery and the storage battery are connected with the battery manager, at least two control pins of the battery manager are respectively connected with the positive electrode of the storage battery through at least two control switches, and a grounding pin of the battery manager is connected with the negative electrode of the storage battery;

the storage battery is used for sending at least two different enabling signals to the battery manager when the at least two control switches are closed or opened;

2. The battery system of claim 1, wherein the at least two control switches comprise a first control switch and a second control switch;

3. The battery system of claim 2, wherein the battery system comprises a battery cell,

when the first control switch and the second control switch are both disconnected, the storage battery provides a first enabling signal for the battery manager, and the first enabling signal is used for enabling the battery manager to control the heating device to heat the power battery according to a first target temperature;

4. The battery system according to any one of claims 1 to 3, wherein the battery manager includes a battery parameter reading module, a battery parameter detecting module, a heating normal determining module, and a heating abnormality determining module;

5. The battery system of claim 4, further comprising at least one heating control switch coupled to the power battery, the heating device, and the battery manager, the heating control switch configured to control the power battery to be disconnected from the heating device or to be connected for a period of time under control of the battery manager.

6. The battery system of claim 5, further comprising a current detection device coupled to the power cell and the battery manager, the current detection device configured to detect a current in a connection loop of the power cell and the heating control switch and to feed back the current to the battery manager.

7. The battery system of claim 1, further comprising a charge-discharge control switch coupled to the power battery and the battery manager, the charge-discharge control switch configured to control the power battery to be powered off with a delay under control of the battery manager.

8. The battery system of claim 1, further comprising a thermal fuse device coupled to the heating device and the power cell, the thermal fuse device configured to fuse when a temperature heated by the heating device exceeds a temperature threshold to disconnect the power cell from the heating device.

9. The battery system of claim 1, wherein the heating device comprises a variable resistance heating element or a constant resistance heating element.

10. An electric vehicle characterized in that it comprises a battery system of the electric vehicle according to any one of claims 1 to 9.