EPS: add initial battering heating schema concept with some notes

modules/EPS/Battery_heater.kicad_sch

@@ -0,0 +1,382 @@
+(kicad_sch (version 20210621) (generator eeschema)
+
+  (uuid 11cd2ff5-feed-4db2-af14-43763d29bc27)
+
+  (paper "A4")
+
+  (title_block
+    (title "BUTCube - EPS")
+    (date "2021-06-01")
+    (rev "v1.0")
+    (company "VUT - FIT(STRaDe) & FME(IAE & IPE)")
+    (comment 1 "Author: Petr Malaník")
+  )
+
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+      )
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+        (effects (font (size 1.27 1.27)) hide)
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+      (property "Datasheet" "https://www.diodes.com/assets/Datasheets/AP22652_53_52A_53A.pdf" (id 3) (at 0 -21.59 0)
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+      (property "ki_description" "Precision adjustable current-limited power switches" (id 5) (at 0 0 0)
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+          (number "4" (effects (font (size 1.27 1.27))))
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+          (number "5" (effects (font (size 1.27 1.27))))
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+        (pin power_in line (at -8.89 2.54 0) (length 2.54)
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+        (effects (font (size 1.27 1.27)) hide)
+      )
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+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_description" "Power symbol creates a global label with name \"GND\" , ground" (id 5) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (symbol "GND_0_1"
+        (polyline
+          (pts
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+            (xy 0 -1.27)
+            (xy 1.27 -1.27)
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+            (xy -1.27 -1.27)
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+          (stroke (width 0)) (fill (type none))
+        )
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+        (pin power_in line (at 0 0 270) (length 0) hide
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+          (number "1" (effects (font (size 1.27 1.27))))
+        )
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+
+
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+    (stroke (width 0) (type solid) (color 0 0 0 0))
+    (uuid ad5b3022-fd8c-4f9c-9ad6-aaa5d29af12c)
+  )
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+    (stroke (width 0) (type solid) (color 0 0 0 0))
+    (uuid 3a163c64-855b-4319-8a09-45352ba36d48)
+  )
+  (wire (pts (xy 148.59 58.42) (xy 148.59 59.69))
+    (stroke (width 0) (type solid) (color 0 0 0 0))
+    (uuid 3a163c64-855b-4319-8a09-45352ba36d48)
+  )
+  (wire (pts (xy 163.83 48.26) (xy 166.37 48.26))
+    (stroke (width 0) (type solid) (color 0 0 0 0))
+    (uuid afc13369-99c8-487c-8822-56c368b15e03)
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+  (text "Assumed heater is resistive heating\n	wire fixed to battery with Kapton tape.\n\nHeating power should be in range of 1-4W.\n\nSuggested heating wire is Kanthal or Konstantan.\n\nWith nominal battery voltage of 3.7V,\n	resistance of wire for 2W heating\n	should be around 6.8R.\n\nFor uniform heat distribution there should be\n	more then at least 20 turns of wire or more."
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+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 461c1ad1-5390-4515-b8f6-2552d42852ec)
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+  (text "Heating can operate in two modes.\nConstant current and Pulse mode.\n\nSelection of right mode depends on heating power.\nPulse is better suited for high power heating.\n\nCurrent limiting resistor for load switch must be\n	adapted for each mode."
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+)