新能源汽车车载交流慢充和维修
本帖最后由 火辣西米秀 于 2024-11-4 09:23 编辑<section data-role="outer" label="edit by 135editor">
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<section>一、慢充结构图</section>
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<p>二、充电流程</p>
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<section>1.插上充电枪;</section>
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<section>2.车载充电机输出12V慢充唤醒信号，唤醒VCU、BMS、仪表;</section>
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<section>3.VCU检测到充电连接确认信号CC，发送充电需求给BMS，仪表点亮充电连接灯;</section>
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<section>4.BMS给车载充电机发送工作指令并闭合继电器;</section>
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<section>5.车载充电机开始工作，给动力电池进行充电;</section>
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<section>6.BMS检测到充满，发送停止充电指令;</section>
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<p>7.车载充电机停止工作;</p>
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<section>三、充电控制</section>
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<section>充电引导盒跟充电机之间没有CAN线的，CP可做充电引导盒跟充电机之间的通信。</section>
<section>1.插上充电枪</section>
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<section>检测点1检测到电压12V→9V，桩连接确认;</section>
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<section>2.车载充电机输出12V慢充唤醒信号，唤醒VCU、BMS、仪表;</section>
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<section>3.VCU检测到充电连接确认信号CC，发送充电需求给BMS，仪表点亮充电连接灯;</section>
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<section>4.充电桩和BMS开始通信</section>
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<section>车:检测点2检测到9V的PWM信号，占空比可知充电桩最大的输出电流，通过RC电阻，可知最大充电电流。最终的充电电流取两者较小值。</section>
<section>5.连接好后车要通知充电桩可以开始充电了</section>
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<section>车:检测点2检测到9V电压，闭合S2，桩检测点1检测到9V→6V，桩可以开始充电。</section>
<section>6.充满电后车要通知充电桩结束充电</section>
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<section>车充满电后断开S2，检测点1:6V→9V，桩将PWM信号切回12V，结束充电。</section>
<section>补充:</section>
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<section>温度低-加热电池-再充电</section>
<section>北汽EV200</section>
<section>电芯温度在0-55℃之间，才可以充电</section>
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<p>低于0℃的温度点，启动自加热模式</p>
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<p>四、允许交流慢充条件</p>
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<section>1.慢充枪连接CC信号有效</section>
<section>2.慢充枪连接CP信号有效</section>
<section>3.车载充电机慢充唤醒信号输出</section>
<section>4.车辆处于静止状态</section>
<section>5.VCU确认各控制器无故障</section>
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<p>6.快充枪连接CC2信号无效</p>
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<p>五、车载交流慢充常见故障</p>
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<section>1、充电桩显示车辆未连接</section>
<section>检查车辆与充电桩两端枪 是否反接</section>
<section>2、动力电池继电器未闭合</section>
<section>检查连接器是否正常连接，</section>
<section>检查充电机输出唤醒是否正常</section>
<section>源</section>
<section>3、电池继电器正常闭合,但充电机 无输出电流检查车端充电枪是否连接到位，检查高压保险是否熔断，</section>
<section>检查高压连接器及线缆是否正确连接</section>
<section>不同的车它的系统设计会有一些不同，但原理上都是一样的。</section>
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国标上PWM好像是±电压
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