阅读说明：本技术 车辆及其电池包冷却控制方法 (Vehicle and battery pack cooling control method thereof ) 是由 张媛 徐少禹 于 2019-09-20 设计创作，主要内容包括：本发明公开了一种车辆及其电池包冷却控制方法,车辆包括：循环管路；泵体,所述泵体设置在所述循环管路上；总流量控制阀,所述总流量控制阀设置于所述循环管路上；多个电池包,每个所述电池包内均设置有冷却通道,所有所述电池包的冷却通道在所述循环管路上仅并联连接。由此,进入到每个电池包的冷却通道内的冷却水温度基本相同,可以使得每个电池包的温度基本接近,从而可以使得多个电池包温度均衡,充放电性能稳定,进而可以更好地保护电池包,可以延长电池包的使用寿命。(The invention discloses a vehicle and a battery pack cooling control method thereof, wherein the vehicle comprises: a circulation line; a pump body disposed on the circulation line; a total flow control valve disposed on the circulation line; the cooling device comprises a plurality of battery packs, wherein each battery pack is internally provided with a cooling channel, and the cooling channels of all the battery packs are only connected in parallel on the circulating pipeline. Therefore, the temperature of cooling water entering the cooling channel of each battery pack is basically the same, the temperature of each battery pack is basically close to each other, the temperature of a plurality of battery packs can be balanced, the charging and discharging performance is stable, the battery packs can be better protected, and the service life of the battery packs can be prolonged.)

1. A vehicle, characterized by comprising:

a circulation line;

a pump body disposed on the circulation line;

a total flow control valve disposed on the circulation line;

the cooling device comprises a plurality of battery packs, wherein each battery pack is internally provided with a cooling channel, and the cooling channels of all the battery packs are only connected in parallel on the circulating pipeline.

2. The vehicle of claim 1, wherein a water inlet pipeline and a water outlet pipeline are connected to the cooling channel of each battery pack and the circulation pipeline, and a flow dividing control valve is arranged on the water inlet pipeline.

3. The vehicle of claim 2, characterized in that the total flow control valve and the split flow control valve are both throttle valves.

4. The vehicle of claim 2, wherein a plurality of said batteries comprise at least one battery pack group, and wherein a plurality of said water inlet lines share a common inlet branch pipe and a plurality of said water outlet lines share a common outlet branch pipe within the same battery pack group, and wherein said inlet branch pipe and said outlet branch pipe are both connected to said circulation pipe.

5. The vehicle of claim 1, characterized in that the total flow control valve is further provided in parallel with a heat exchanger.

6. The vehicle of claim 2, further comprising: the temperature sensor comprises an inlet temperature sensor and an outlet temperature sensor, wherein the inlet temperature sensor and the outlet temperature sensor are respectively arranged at an inlet and an outlet of the pump body.

7. The vehicle of claim 6, further comprising: the battery management system is electrically connected with the thermal management system, and the inlet temperature sensor, the outlet temperature sensor, the total flow control valve and the branch flow control valve are electrically connected with the thermal management system.

8. A battery pack cooling control method of a vehicle, characterized in that the vehicle is the vehicle of any one of claims 1 to 7;

the control method comprises the following steps:

detecting the highest temperature T of the battery pack_max；

T_maxAnd a first set value T_{Set value 1}The relationship between:

1) when T is_max＝T_{Set value 1}Opening the total flow control valve;

2)T_max≤T_{set value 2}The opening degree of the total flow rate control valve is increased.

9. The battery pack cooling control method of the vehicle according to claim 8, characterized by further comprising:

determination of T_maxAnd a second set value T_{Set value 2}The relationship between:

1) when T is_{Set value 1}＜T_max＜T_{Set value 2}Increasing the opening degree of the total flow control valve;

2) when T is_max≥T_{Set value 2}The total flow control valve is increased to a maximum.

10. The battery pack cooling control method of a vehicle according to claim 9, wherein the total flow rate control valve is further provided in parallel with a heat exchanger;

the control method further comprises the following steps:

when T is_max>T_{Set value 2}While turning on the heat exchanger.

11. The battery pack cooling control method of the vehicle according to claim 8, wherein a divided flow rate control valve is provided for each of the battery packs;

the control method further comprises the following steps:

finding out the battery pack with the highest and the lowest temperature and detecting the temperature as T_maxAnd T_min，T_max-T_min＝ΔT_max；

Determination of DeltaT_maxDifference Δ T from the first setting_{Set value 1}The relationship between:

1) when Δ T_max＝ΔT_{Set value 1}When the temperature of the battery pack is higher than the preset temperature, the shunt flow control valve of the battery pack with the highest temperature and the lowest temperature is opened and kept at the minimum opening;

2) when Δ T_{Set value 1}＜ΔT_maxAnd increasing the opening degree of the divided flow rate control valve of the battery pack having the highest and lowest temperatures.

12. The battery pack cooling control method of a vehicle according to claim 11, characterized in that it is further necessary to determine T_maxDifference Δ T from the second setting_{Set value 2}The relationship between:

1)ΔT_{set value 1}＜ΔT_max＜ΔT_{Set value2}Increasing the opening degree of the split flow control valve of the battery pack with the highest and lowest temperature;

2)ΔT_max≥ΔT_{set value 2}And increasing the opening degrees of the divided flow rate control valves of the battery packs having the highest and lowest temperatures to the maximum.

Technical Field

The invention relates to the technical field of vehicles, in particular to a vehicle and a battery pack cooling control method thereof.

Background

At present, most of electric automobiles adopt lithium ion batteries, and the capacity and the discharge capacity of the lithium ion batteries have a direct relation with the temperature. When the temperature is too low, the capacity of the power battery is reduced, and if the power battery is recycled at low temperature, the service life of the power battery is shortened; when the temperature is too high, the performance of the power battery is affected, and considering that the temperature of the use environment of the electric automobile is different, how to enable the power battery to work in an ideal temperature range becomes more important.

With the increase of energy density of the power battery and the increase of the requirement of the endurance mileage of the whole vehicle, the traditional power battery heat management system (natural cooling or air cooling) cannot meet the requirement, so that the high-power battery needs to adopt a liquid cooling scheme. The cooling scheme adopted by the passenger vehicle at present is the combination of a battery pack and a cooling unit, the structural integration degree of the scheme is high, but because the water channel connection mode of the scheme is series-parallel connection combination, the temperature consistency is difficult to control, the battery pack is poor in cooling balance, the energy utilization rate of the system is low, and the cycle life of the system is short.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a vehicle, which can reasonably control the operating temperature of a battery pack and ensure the operational safety of the battery pack.

The invention further provides a battery pack cooling control method of the vehicle.

A vehicle according to an embodiment of the present invention includes: a circulation line; a pump body disposed within the circulation line; a total flow control valve disposed on the circulation line; the cooling device comprises a plurality of battery packs, wherein each battery pack is internally provided with a cooling channel, and the cooling channels of all the battery packs are only connected in parallel on the circulating pipeline.

From this, the equal parallel connection of cooling channel of two arbitrary battery packages, the cooling water temperature that enters into in the cooling channel of every battery package is the same basically like this, can be so that the temperature of every battery package is close basically to can make a plurality of battery package temperature balance, the charge-discharge performance is stable, and then can protect the battery package better, can prolong the life of battery package.

In some examples of the present invention, the cooling channel of each of the battery packs is connected to the circulation line with a water inlet line and a water outlet line, and the water inlet line is provided with a flow dividing control valve.

In some examples of the invention, the total flow control valve and the split flow control valve are both throttle valves.

In some examples of the present invention, the plurality of batteries constitute at least one battery pack group, and in the same battery pack group, the plurality of water inlet pipelines share one branch inlet pipe, the plurality of water outlet pipelines share one branch outlet pipe, and the branch inlet pipe and the branch outlet pipe are both connected to the circulation pipeline.

In some examples of the invention, the total flow control valve is also provided in parallel with a heat exchanger.

In some examples of the invention, the vehicle further comprises: the temperature sensor comprises an inlet temperature sensor and an outlet temperature sensor, wherein the inlet temperature sensor and the outlet temperature sensor are respectively arranged at an inlet and an outlet of the pump body.

In some examples of the invention, the vehicle further comprises: the battery management system is electrically connected with the thermal management system, and the inlet temperature sensor, the outlet temperature sensor, the total flow control valve and the branch flow control valve are electrically connected with the thermal management system.

According to the battery pack cooling control method of the vehicle of the invention, the vehicle is the vehicle; detecting the highest temperature T of the battery pack_max；T_maxAnd a first set value T_{Set value 1}The relationship between: 1) when T is_max＝T_{Set value 1}Opening the total flow control valve; 2) when T is_max≤T_{Set value 2}The opening degree of the total flow rate control valve is increased.

In some examples of the invention, the control method further comprises: determination of T_maxAnd a second set value T_{Set value 2}The relationship between: 1) when T is_{Set value 1}＜T_max＜T_{Set value 2}Increasing the opening degree of the total flow control valve; 2) when T is_max≥T_{Set value 2}While increasing the total flowThe amount control valve is maximized.

In some examples of the invention, the total flow control valve is further provided in parallel with a heat exchanger; the control method further comprises the following steps: when T is_max>T_{Set value 2}While turning on the heat exchanger.

In some examples of the invention, each battery pack is provided with a flow dividing control valve; the control method further comprises the following steps: finding out the battery pack with the highest and the lowest temperature and detecting the temperature as T_maxAnd T_min，T_max-T_min＝ΔT_max(ii) a Determination of DeltaT_maxDifference Δ T from the first setting_{Set value 1}The relationship between: 1) when Δ T_max＝ΔT_{Set value 1}When the temperature of the battery pack is higher than the preset temperature, the shunt flow control valve of the battery pack with the highest temperature and the lowest temperature is opened and kept at the minimum opening; 2) when Δ T_{Set value 1}＜ΔT_maxAnd increasing the opening degree of the divided flow rate control valve of the battery pack having the highest and lowest temperatures.

In some examples of the invention, it may also be desirable to determine T_maxDifference Δ T from the second setting_{Set value 2}The relationship between: 1) delta T_{Set value 1}＜ΔT_max＜ΔT_{Set value 2}Increasing the opening degree of the split flow control valve of the battery pack with the highest and lowest temperature; 2) delta T_max≥ΔT_{Set value 2}And increasing the opening degrees of the divided flow rate control valves of the battery packs having the highest and lowest temperatures to the maximum.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic illustration of a vehicle with respect to battery pack cooling according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a battery pack cooling control method of a vehicle according to one embodiment of the invention;

fig. 3 is a schematic diagram of a battery pack cooling control method of a vehicle according to another embodiment of the present invention.

Reference numerals:

a circulation line 10; a water inlet line 11; a water outlet pipeline 12; a branch inlet pipe 13; a branched outlet pipe 14;

a pump body 20; a total flow control valve 30; a battery pack 40; the divided flow rate control valve 41;

a heat exchanger 50; an inlet temperature sensor 60; an outlet temperature sensor 70; a battery management system 80; a thermal management system 90.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

A vehicle according to an embodiment of the invention is described below with reference to fig. 1.

As shown in fig. 1, a vehicle according to an embodiment of the present invention may include: the cooling water circulation system comprises a circulation pipeline 10, a pump body 20, a total flow control valve 30 and a plurality of battery packs 40, wherein the pump body 20 is a water pump, the pump body 20 is arranged in the circulation pipeline 10, and the pump body 20 can provide power for circulation cooling water flowing in the circulation pipeline 10. The total flow control valve 30 is disposed on the circulation line 10, the total flow control valve 30 is connected in series with the pump body 20, the total flow control valve 30 is used to control the flow rate of the circulation line 10, and the total flow control valve 30 may be a throttle valve.

Each battery pack 40 is provided with a cooling channel (not shown), and the cooling channels of all the battery packs 40 are connected in parallel on the circulation pipeline 10, that is, the cooling channels in any two battery packs 40 are not connected in series. A plurality of electric cores arranged in sequence are arranged in the battery pack 40, and the cooling channel can be arranged around the plurality of electric cores. Wherein, the cooling channel in every battery package 40 all communicates with circulation pipeline 10, like this cooling water can pass through in every battery package 40, the heat of electric core can effectively be taken away to the cooling water in the cooling channel, and the equal parallel connection of cooling channel of arbitrary two battery packages 40, the cooling water temperature that enters into in the cooling channel of every battery package 40 like this is the same basically, can make the temperature of every battery package 40 approximate basically, thereby can make a plurality of battery packages 40 temperature balanced, the charge and discharge performance is stable, and then can protect battery package 40 better, can prolong battery package 40's life.

According to an alternative embodiment of the present invention, as shown in fig. 1, a water inlet pipe 11 and a water outlet pipe 12 are connected to the cooling passage of each battery pack 40 and the circulation pipe 10, and a flow dividing control valve 41 is provided on the water inlet pipe 11. The water inlet pipeline 11 and the water outlet pipeline 12 are respectively used for water inlet and outlet to the cooling channel, and the flow dividing control valve 41 can be used for controlling the flow of cooling water entering the cooling channel corresponding to the battery pack 40, so that the effect of accurately controlling the temperature of each battery pack 40 can be achieved, the temperature balance of the plurality of battery packs 40 can be better, and the battery packs 40 can be further better protected. The divided flow rate control valve 41 may also be a throttle valve.

As shown in fig. 1, a plurality of batteries form at least one battery pack group, in the same battery pack group, a plurality of water inlet pipelines 11 share one branch inlet pipe 13, a plurality of water outlet pipelines 12 share one branch outlet pipe 14, and the branch inlet pipe 13 and the branch outlet pipe 14 are both connected to the circulation pipeline 10. By arranging the branch inlet pipe 13 and the branch outlet pipe 14, cooling water can be conveniently fed into and discharged from the cooling channel of each battery pack 40, the number of water inlet and outlet ports arranged on the circulation pipeline 10 can be reduced, and the structure of the circulation pipeline 10 can be simplified.

Optionally, as shown in FIG. 1, total flow control valve 30 is also provided in parallel with heat exchanger 50. It can be understood that, when the temperature of the cooling water supplied to the battery pack 40 is high and the heat of the battery pack 40 cannot be effectively taken away, the vehicle can control the heat exchanger 50 to be opened, the heat exchanger 50 can reduce the temperature of the cooling water in the circulating pipeline 10 in a heat exchange manner, so that the heat of the battery pack 40 can be effectively taken away by the cooling water after the temperature is reduced, the battery pack 40 is in a reasonable working temperature range, and the charging and discharging stability of the battery pack 40 can be ensured.

Specifically, as shown in fig. 1, the vehicle may further include: an inlet temperature sensor 60 and an outlet temperature sensor 70, the inlet temperature sensor 60 and the outlet temperature sensor 70 being provided at the inlet and the outlet of the pump body 20, respectively. The inlet temperature sensor 60 and the outlet temperature sensor 70 can detect the inlet cooling water temperature and the outlet cooling water temperature of the pump body 20, that is, the inlet temperature sensor 60 and the outlet temperature sensor 70 can detect the cooling water temperature supplied to the battery pack 40 and the cooling water temperature flowing out of the battery pack 40, so that the cooling water temperature in the whole circulation line 10 can be effectively known, and the control of the working temperature of the battery pack 40 can be facilitated.

Further, as shown in fig. 1, the vehicle further includes: a battery management system 80 and a thermal management system 90, wherein the battery management system 80 is electrically connected to the thermal management system 90, and the inlet temperature sensor 60, the outlet temperature sensor 70, the total flow control valve 30 and the split flow control valve 41 are electrically connected to the thermal management system 90. The battery management system 80 may control the operating temperature of the battery packs 40 through the thermal management system 90, and the thermal management system 90 may receive the detection temperatures of the inlet temperature sensor 60 and the outlet temperature sensor 70, and control the total flow control valve 30 and the divided flow control valve 41 to selectively operate according to a set condition, so that the operating temperatures of the plurality of battery packs 40 may be within a reasonable operating temperature range, and thus the battery packs 40 may be effectively protected, and the service lives of the battery packs 40 may be prolonged.

As shown in fig. 2, a battery pack cooling control method of a vehicle according to an embodiment of the present invention may include: detecting the highest temperature T between the battery packs 40_maxWherein the inlet temperature sensor 60 and the outlet temperature sensor 70 are used to detect the respective temperatures T_max；T_maxAnd a first set value T_{Set value 1}The relationship between: 1) when T is_max＝T_{Set value 1}Opening total flow control valve 30; 2) when T is_{Set value 1}＜T_maxAt this time, the opening degree of the total flow rate control valve 30 is increased. Wherein, let water flow be represented by Y, Y ═ kx + b, Y denote total flow, k denote adjustable coefficient, x denote adjustable flow, b denote minimum flow. When T is_max＝T_{Set value 1}When the total flow rate control valve 30 is opened, the opening degree is b, and T is_{Set value 1}＜T_max＜T_{Set value 2}When, according to k ═ f (T)_max) (means that k follows T_maxIs adjusted) by the value of (c). Through the aperture of reasonable control total flow control valve 30, can rationally control the operating temperature of a plurality of battery package 40, can effectively protect battery package 40, can prolong battery package 40's life.

Further, as shown in fig. 2, the control method further includes: determination of T_maxAnd a second set value T_{Set value 2}The relationship between: 1) when T is_{Set value 1}＜T_max＜T_{Set value 2}At this time, the opening degree of the total flow control valve 30 is increased; 2) when T is_max≥T_{Set value 2}At this time, the total flow control valve 30 is increased to a maximum, k_max. The control method can select the flow rate of the cooling water supplied to the cooling channel of the battery pack 40 according to the actual temperature of the cooling water of the battery pack 40, thereby accurately controlling the working temperature of the plurality of battery packs 40 and enabling the plurality of battery packs 40 to meet the power output requirement under various working conditions of the vehicle.

The control method further comprises the following steps: when T is_max>T_{Set value 2}At this time, the heat exchanger 50 is turned on. When T is_max>T_{Set value 2}During the process, the battery management system 80 requests to start refrigeration, and the thermal management system 90 detects a high-temperature alarm of the battery management system 80, at the moment, the heat exchanger 50 is opened, and the battery pack 40 starts to be cooled, so that the heat exchanger 50 can quickly complete heat exchange of cooling water in the circulating pipeline 10, the cooling water after temperature reduction can effectively reduce the working temperature of the battery pack 40, the battery pack 40 can be effectively protected, and the battery pack 40 can be in a reasonable working temperature range. When the thermal management system 90 detects that the highest temperature of the battery core in the battery pack 40 is below an alarm recovery value, or the voltage of the low-voltage power supply is lower than a low-voltage power supply allowable use voltage lower limit protection value, the heat exchanger 50 is closed, and refrigeration is stopped; additionally, the heat exchanger 50 is shut down when the battery management system 80 does not have a high temperature alarm. Through setting up heat exchanger 50, can intervene the cooling system of battery package 40 fast when battery package 40 high temperature, can reduce the cooling water temperature in the circulating line 10 fast, can further reduce the temperature of battery package 40 fast, canSo as to prevent the battery pack 40 from being damaged and ensure the safety of the battery pack 40.

Optionally, as shown in fig. 3, the control method further includes: find the battery pack 40 with the highest and lowest temperature and detect the temperature thereof as T_maxAnd T_min，T_max-T_min＝ΔT_max(ii) a Determination of DeltaT_maxDifference Δ T from the first setting_{Set value 1}The relationship between: 1) when Δ T_max＝ΔT_{Set value 1}When the temperature is the highest, the split flow rate control valve 41 of the battery pack 40 of the lowest temperature is opened and kept at the minimum opening degree; 2) when Δ T_{Set value 1}＜ΔT_maxThe opening degrees of the divided flow rate control valves 41 of the battery packs 40 having the highest and lowest temperatures are increased. Wherein, let Y_ipThe throttle valve, Y, corresponding to the battery pack 40 at which the temperature is at a maximum_iqThe throttle valve corresponding to the battery pack 40 with the minimum temperature value is determined according to the total water flow rate_ip+ΔY_iq0, wherein Y_ip＝k_ip x_ip+b_ip；Y_iq＝k_iq x_iq+b_iqWhen Δ T is_max＝ΔT_{Set value 1}At this time, the branch flow rate control valve 41 corresponding to the battery pack 40 having the highest temperature is set to the initial value. The maximum temperature value and the minimum temperature value are combined into a group, the second maximum temperature value and the second minimum temperature value are combined into a group, and the rest is repeated, and finally the requirement of delta Y is met_ip+ΔY_iqI.e., the flow direction of the cooling channels of the two battery packs 40 is opposite to each other.

Further, thermal management system 90 also needs to determine T_maxDifference Δ T from the second setting_{Set value 2}The relationship between: 1) delta T_{Set value 1}＜ΔT_max＜ΔT_{Set value 2}When the temperature is high, the opening degree of the split flow control valve 41 of the battery pack 40 with the highest temperature and the lowest temperature is increased; 2) delta T_max≥ΔT_{Set value 2}At this time, the opening degree of the divided flow rate control valve 41 of the battery pack 40 having the highest temperature and the lowest temperature is increased to the maximum. Thus, by appropriately controlling the temperature of each battery pack 40, the temperature balance among the plurality of battery packs 40 can be further improved, and the safety of the battery packs 40 can be improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.