CN-122008913-A - Low-temperature charging compensation method and new energy source flow vehicle

CN122008913ACN 122008913 ACN122008913 ACN 122008913ACN-122008913-A

Abstract

The invention discloses a low-temperature charging compensation method and a new energy source flow vehicle, wherein the method comprises the steps of judging whether the current lowest monomer temperature T min is lower than a preset low-temperature threshold value or not; if not, entering a charging and heating stage, wherein the WPTC continuously works to heat the battery, and a battery charging window is released to allow the battery to be charged. According to the low-temperature charging compensation method and the new energy source flow vehicle, when the current lowest monomer temperature T min is lower than the preset low-temperature threshold value, a charging preheating process based on a charging compensation strategy is carried out, so that the low-temperature charging efficiency of the new energy source flow vehicle is improved, the charging waiting time is shortened, the charging current value request problem that the battery temperature is lower than 0 ℃ is optimized, the charging energy supplementing efficiency is accelerated, and the low-temperature charging problem that T min is lower than-20 ℃ can be solved.

Inventors

YAN YIFEI
CHEN YAO
ZHU YONGCHANG
WANG HAO
GUO FENG
SU SONGLIN
YUAN ZHIMING
ZHU LUSHENG

Assignees

安徽江淮汽车集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (10)

1. A low temperature charge compensation method, comprising: judging whether the current lowest monomer temperature T min is lower than a preset low-temperature threshold value or not; If yes, charging and preheating are carried out, and charging compensation is carried out in the charging and preheating process; if not, entering a charging and heating stage, wherein the WPTC continuously works to heat the battery, and the battery charging window is released to allow the battery to be charged.
2. The low temperature charge compensation method of claim 1, wherein the preset low temperature threshold is-20 ℃.
3. The low-temperature charge compensation method according to claim 1, wherein the performing charge warm-up and performing charge compensation during charge warm-up includes: Setting the initial request pile current to 5A; detecting a battery charging current value in real time, and performing dynamic compensation adjustment on the battery charging current value; After the battery charging current value is stable, starting an air conditioner for heating, adjusting the output current of the pile, and triggering the dynamic compensation adjustment of the battery charging current value again; After the air conditioner heating stably operates, the air conditioner heating is closed, and the pile request current is adjusted downwards.
4. The low-temperature charge compensation method according to claim 3, wherein the detecting the battery charge current value in real time while performing the dynamic compensation adjustment on the battery charge current value comprises: If the initial request pile current is 5A, the output current of the charging pile is 5A, the current WPTC heating consumption current is 14.5A-15.5A, the battery external discharge current is 9.5A-10.5A, a dynamic adjustment strategy is triggered at the moment, the request current of the BMS for the charging pile is increased at the speed of 2A/s until the battery discharge detects the external discharge of 1A-2A, the output current of the charging pile is finally 12.5A-13.5A, the battery output current is 1.5A-2.5A, and the WPTC consumption current is 14.5A-15.5A.
5. The method of claim 4, wherein detecting the battery charging current value in real time while performing dynamic compensation adjustment on the battery charging current value, further comprises: in the process of the BMS dynamically adjusting the request current, the condition for stopping adjustment comprises that the difference value between the battery charging current value detected in real time and the current value obtained through MAP table lookup is within 2A.
6. The low temperature charge compensation method of claim 4, wherein in the process of dynamically adjusting the request current by the BMS, if the battery charging current value detected in real time cannot always reach the current value obtained by MAP lookup due to the power limit of the charging pile, an upper limit adjustment value of the battery charging current value is set.
7. The low-temperature charge compensation method according to claim 6, wherein the upper limit adjustment value of the battery charge current value is 40A.
8. The method of claim 4, wherein detecting the battery charging current value in real time while performing dynamic compensation adjustment on the battery charging current value, further comprises: if the BMS request current value is increased by the upper limit adjustment value due to the limitation of the power of the charging pile, and the battery charging current still cannot reach the current MAP table lookup value, the battery charging current is output in a steady state according to the maximum adjustment request current value; If the power of the charging pile is tested to be released and the output current suddenly increases, the BMS detects that the actual value of the battery charging current value exceeds the MAP query value 5A, then the charging current is requested according to the MAP query value by directly subtracting the dynamically adjusted charging request increasing value in the next second; after steady state operation for 1min, dynamic adjustment of the battery charging current value is triggered again.
9. The method of claim 3, wherein the starting the air conditioning heating, adjusting the pile output current, and triggering the dynamic compensation adjustment of the battery charging current value again comprises: The passenger cabin is started for air-conditioning heating, the consumption current of the electric appliance at the whole vehicle end is increased by 7A, the discharge current of the battery is increased to 8A-9A, the pile request current is continuously regulated at the speed of 2A/s, the pile output current is finally 19A-21A, the battery output current is 1.5A-2.5A, the WPTC and the air-conditioning heating consumption are 22A-24A, After the air conditioner heating stably operates, the air conditioner heating is closed, the pile request current is adjusted downwards, and the method comprises the following steps: after the air conditioner heating stably operates, the air conditioner heating is turned off suddenly, 7A current of the original air conditioner heating enters the battery, and the battery detects charging current of-5A, so that the charging window does not allow charging, the BMS can regulate the pile request current to 7A in the next second, and dynamic balance adjustment is recovered.
10. A new energy source vehicle employing the low temperature charge compensation method of any one of claims 1-8.

Description

Low-temperature charging compensation method and new energy source flow vehicle Technical Field The invention relates to the technical field of new energy logistics vehicles, in particular to a low-temperature charging compensation method and a new energy source flow vehicle. Background The energy supplementing efficiency of the new energy automobile is an important bottleneck for limiting the replacement of the fuel oil automobile, and the energy supplementing efficiency of the new energy automobile is close to the energy supplementing efficiency of the fuel oil automobile because different technical routes are all on the ground, such as a circuit changing technical route, and the full power supplementing for 3 minutes can be realized. Another is a fast charging strategy, the new energy automobile power battery still uses liquid electrolyte as the main material, and the energy battery itself has limited fast charging capacity. With the expansion of new energy logistics vehicle application manufacturers, the problem of the charging speed of vehicles in cold areas becomes a relatively popular research topic. With the technical iteration progress, the low-temperature charging compensation technology has a good market prospect, and the biggest advantage is that the low-temperature area energy supplementing efficiency of the new energy pure electric light card quick charging is improved. Therefore, there is a need for a low temperature charge compensation method and a new energy source vehicle. Disclosure of Invention The invention aims to provide a low-temperature charging compensation method and a new energy source flow vehicle, so as to solve the problems in the prior art, improve the low-temperature charging efficiency of the new energy source flow vehicle and reduce the charging waiting time. The invention provides a low-temperature charging compensation method and a new energy source flow vehicle, wherein the method comprises the following steps: judging whether the current lowest monomer temperature T min is lower than a preset low-temperature threshold value or not; If yes, charging and preheating are carried out, and charging compensation is carried out in the charging and preheating process; if not, entering a charging and heating stage, wherein the WPTC continuously works to heat the battery, and the battery charging window is released to allow the battery to be charged. The low temperature charge compensation method as described above, wherein the preset low temperature threshold is preferably-20 ℃. The low-temperature charge compensation method as described above, wherein preferably, the performing charge preheating and performing charge compensation during charge preheating includes: Setting the initial request pile current to 5A; detecting a battery charging current value in real time, and performing dynamic compensation adjustment on the battery charging current value; After the battery charging current value is stable, starting an air conditioner for heating, adjusting the output current of the pile, and triggering the dynamic compensation adjustment of the battery charging current value again; After the air conditioner heating stably operates, the air conditioner heating is closed, and the pile request current is adjusted downwards. The low-temperature charging compensation method as described above, wherein preferably, the detecting the battery charging current value in real time and performing dynamic compensation adjustment on the battery charging current value at the same time includes: If the initial request pile current is 5A, the output current of the charging pile is 5A, the current WPTC heating consumption current is 14.5A-15.5A, the battery external discharge current is 9.5A-10.5A, a dynamic adjustment strategy is triggered at the moment, the request current of the BMS for the charging pile is increased at the speed of 2A/s until the battery discharge detects the external discharge of 1A-2A, the output current of the charging pile is finally 12.5A-13.5A, the battery output current is 1.5A-2.5A, and the WPTC consumption current is 14.5A-15.5A. The low temperature charge compensation method as described above, wherein it is preferable that the condition for stopping the adjustment in the process of the BMS dynamically adjusting the request current includes that the difference between the battery charge current value detected in real time and the current value obtained through MAP lookup is within 2A. The low-temperature charging compensation method as described above, wherein preferably, the detecting the battery charging current value in real time and performing dynamic compensation adjustment on the battery charging current value at the same time further includes: in the process of BMS dynamic adjustment of request current, if the battery charging current value detected in real time can not reach the current value obtained through MAP table lookup all the time due to the limitation o