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Changes for page 3.3 Control

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69 69  * Min-Max SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if any cell has 100% SOC, b) 0% if any cell has 0% SOC;
70 70  * Max-Min SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if all cells have 100% SOC, b) 0% if all cells have 0% SOC.
71 71  
72 -To change other settings of SOC estimation, select the "Control → SOC estimation” section:
73 -
74 -
75 -In this section:
76 -
77 -* (((
78 78  Other parameters:
79 -)))
73 +
80 80  * Scale the final SOC – a flag to scale the battery SOC by the following values;
81 81  * SOC corresponding to 0% – the battery SOC that sets to be 0%;
82 82  * SOC corresponding to 100% – the battery SOC that sets to be 100%.
... ... @@ -87,7 +87,6 @@
87 87  * Coulomb counting correction (temperature) – the dependence of battery capacity on temperature;
88 88  * Coulomb counting correction (cycles) – the dependence of battery capacity on the number of charge-discharge cycles.
89 89  
90 -
91 91  === SOC correction ===
92 92  
93 93  The BMS Mini device can recalculate the battery SOC after long-term storage or after long-term working in the case when the battery was not charged fully or discharged totally. Recalculation is done based on the tabular dependency Uocv = Uocv (SOC, t) (see [[SOC estimation>>doc:||anchor="HSOCestimation"]]).
... ... @@ -109,18 +109,26 @@
109 109  
110 110  Calculation of the resistance of cells is carried out in two ways. The first method is used when the battery passes from a relaxation state to a charge or discharge state, wherein the cell resistance value
111 111  
112 -R = (U-U,,ocv,,) / I,,stable,,,
105 +{{formula fontSize="SMALL" imageType="PNG"}}
106 +R = \frac{U-U_{ocv}}{I_{stable}}
107 +{{/formula}}
113 113  
114 114  where U is the cell voltage measured in the charge or discharge state, V; U,,ocv,, is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, – stabilized current through the cell in the state of charge or discharge.
115 115  
116 116  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
117 117  
118 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
113 +{{formula fontSize="SMALL"}}
114 +R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
115 +{{/formula}}
119 119  
120 -(Q,,max,, is the maximum cell capacity),
117 +provided that
121 121  
122 -where U,,2,, is the voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, – the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
119 +{{formula fontSize="SMALL"}}
120 +| I_{stable2}-I_{stable1} | > 0.2 × Qmax
121 +{{/formula}}
123 123  
123 +where Q,,max,, — the maximum cell capacity,U,,2,, — voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, — the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
124 +
124 124  The stabilized current I,,stable,, = I, if during the stabilization time the instantaneous current I is in the range from 0.95 × I to 1.05 × I.
125 125  
126 126  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
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137 137  
138 138  The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance/2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see [[Common settings>>doc:||anchor="HCommonsettings"]]). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).
139 139  
141 +=== Low SOC (signal) ===
142 +
143 +To change the parameters of the generation a signal about low battery level, select the "Control → Low SOC (signal)" section:
144 +
145 +[[image:1740396460923-423.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="141" width="800"]]
146 +
147 +In this section:
148 +
149 +* Enable – a flag to enable signal generation;
150 +* Minimum SOC, %;
151 +* Tolerant SOC, %;
152 +* Delay before setting the signal, second;
153 +* Delay before clearing the signal, second;
154 +* Lock – lock the signal until the device is reset.
155 +
156 +Signal generation conditions:
157 +
158 +* the battery SOC is less than the “Minimum SOC” value during the “Delay before setting the signal” time.
159 +
160 +Conditions for clearing the signal:
161 +
162 +* the battery SOC is greater than the “Tolerant SOC” during the “Delay before clearing the signal” time.
163 +
164 +(% class="box infomessage" %)
165 +(((
166 +The "Low SOC signal" is indicative and can be output to a discrete output or a power switch.
167 +)))
168 +
169 +=== High charging current (signal) ===
170 +
171 +To change the parameters of the generation high-current signal, select the "Control → High charging current (signal)" section:
172 +
173 +[[image:1740396996935-403.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="144" width="800"]]
174 +
175 +In this section:
176 +
177 +* Enable – a flag to enable signal generation;
178 +* Maximum charging current, А;
179 +* Tolerant charging current, А;
180 +* Delay before setting the signal, second;
181 +* Delay before clearing the signal, second;
182 +* Lock – lock the signal until the device is reset.
183 +
184 +Signal generation conditions:
185 +
186 +* the measured current is greater than the “Maximum charging current” value during the “Delay before setting the signal” time.
187 +
188 +Conditions for clearing the signal:
189 +
190 +* the measured current is less than the “Tolerant charging current” value during the “Delay before clearing the signal” time.
191 +
192 +(% class="box infomessage" %)
193 +(((
194 +The "High charging current" signal is indicative and can be output to a discrete output or a power switch.
195 +)))
196 +
140 140  === Charge map ===
141 141  
142 142  The BMS Mini device calculates maximum allowable charge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
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145 145  
146 146  To configure parameters for determining the charge current limit, select the "Control → Charge map" section:
147 147  
148 -[[image:1733746766504-864.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="138" width="800"]]
149 -
205 +[[image:1740397188247-315.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="179" width="800"]]
150 150  In this section:
151 151  
152 152  * Enable – a flag to start calculation of the charge current limit;
153 -* Maximum charge current – a maximum allowable value of the charge current (under normal conditions):
154 -* Option 1: Limit charge current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current Kcs depending on SOC and battery temperature;
209 +* Maximum charge current – a maximum allowable value of the charge current (under normal conditions), A;
210 +* Rate of change – a rate of change the current limit to a new value (0 is for immediate change), A/s;
211 +* Option 1: Limit charge current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current** Kcs** depending on SOC and battery temperature;
155 155  * Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;
156 -
157 -[[image:1733746766506-660.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="196" width="800"]]
158 -
159 -* Option 2: Limit charge current by the contactor temperature – a flag to enable correction of maximum allowable charging current Kcc depending on contactor temperature;
213 +* Option 2: Limit charge current by the contactor temperature – a flag to enable correction of maximum allowable charging current **Kcc** depending on contactor temperature;
160 160  * Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;
215 +* Option 3: Limit charge current by the maximum cell voltage - a flag to enable correction of maximum allowable charging current **Kcv** depending on maximum cell voltage;
216 +* Option 3: Cell voltage x Factor – the dependence of the correction factor on maximum cell voltage;
217 +* Option 4: Limit charge current by the cell temperature - a flag to enable correction of maximum allowable charging current **Kct** depending on maximum cell temperature;
218 +* Option 4: Cell temperature x Factor – the dependence of the correction factor on maximum cell temperature.
161 161  
162 -[[image:1733746766508-178.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="184" width="800"]]
220 +Value of the charge current limit at given SOC, temperature, contactors temperature, maximum cell voltage and maximum cell temperature is calculated as follows:
163 163  
164 -* Option 3: Limit charge current by the maximum cell voltage - a flag to enable correction of maximum allowable charging current Kcv depending on maximum cell voltage;
165 -* Option 3: Cell voltage x Factor – the dependence of the correction factor on maximum cell voltage.
222 +**Charge current limit = Maximum charge current × Kcs × Kcc × Kcv × Kct**
166 166  
167 -[[image:1733746766509-971.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="217" width="800"]]
168 -
169 -Value of the charge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows:
170 -
171 -Charging current limit = Maximum charging current × Kcs × Kcc × Kcv
172 -
173 173  === Discharge map ===
174 174  
175 175  The BMS Mini device calculates maximum allowable discharge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
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