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Method for monitoring current sensors

A current sensor and current technology, applied in electrical devices, only measuring current, electrochemical generators, etc., can solve problems such as explosion danger, drive failure, and endanger the thermal stability of the battery pack, and achieve the effect of avoiding failure.

Inactive Publication Date: 2016-05-04
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Besides that, too high a discharge current may compromise the thermal stability of the battery pack and thus lead to an explosion hazard
If the discharge current of the vehicle battery pack cannot be reliably determined, the international standard ISO26262 requires the interruption of the battery pack current, which especially in battery-operated vehicles leads to a complete failure of the drive

Method used

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  • Method for monitoring current sensors
  • Method for monitoring current sensors

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Embodiment Construction

[0040] figure 1 A circuit 1 is shown which has current sensors 7 , 8 , 9 for determining the total current I flowing through the circuit and by means of which the method according to the invention can be carried out by way of example. The total current I is delivered by a battery pack, not shown here, which is preferably embodied as a lithium-ion battery pack.

[0041] Circuit 1 has a main line section 2 and a parallel line section 3 connected in series with main line section 2 , wherein main line section 2 has a main line 4 and parallel line section 3 has at least two parallel line paths 5 , 6 . The total current I flows in the main line 4 and divides the current I 1 , I 2 Each flows in at least two parallel line paths 5 , 6 . Furthermore, the at least two line paths 5 , 6 each have a function for determining the corresponding partial current I 1 , I 2 The current sensor 7,8. Furthermore, the circuit 1 has a current sensor 9 for determining the total current I in the bu...

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Abstract

The invention relates to a method for monitoring current sensors (7), (8), (9) during the determining of a total electric current, I, from a battery, preferably from a lithium-ion battery, in an electrical circuit (1) having current sensors (7), (8) in a parallel conductor section (3) with at least two parallel conduction paths (5), (6), for determining the respective current components I1, I2. According to the invention, the electric circuit (1) has a further current sensor (9) for determining the total current I. In a scaling step, scaling factors S1, S2 are defined, by the use of which current components I1, I2 flowing in the parallel conduction paths (5), (6) can be scaled up to the total current, I. In a monitoring step, measured current components IM1, IM2 are scaled up by means of scaling factors S1, S2 and thus calculated total currents IB1 (10), IB2 (11) are defined and compared with one another and with a total current IM (12) determined by the current sensor (9). The invention further relates to a battery system with a control device configured to perform such a method.

Description

technical field [0001] The invention relates to a method for monitoring a current sensor when determining the current delivered by a battery pack. Background technique [0002] Battery pack systems are increasingly used as energy accumulators for not only stationary but also mobile applications. Examples of stationary use include wind power plants and backup power systems and examples of mobile use include electric vehicles and hybrid vehicles. In this case, very high demands are placed on the battery system in terms of reliability, performance, lifetime and safety in this type of use. [0003] Battery systems based on lithium-ion battery cells are very frequently used here. For this purpose, generally a plurality of battery cells are connected in series to form a battery module. A plurality of battery modules are in turn connected in series and / or in parallel to form a battery system, also referred to below as a battery pack. [0004] In order to be able to meet the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R35/00
CPCG01R19/00G01R35/00H01M10/48G01R31/36G01R19/0092Y02E60/10B60L3/0038G01R19/10
Inventor J.施奈德F.福拉特
Owner ROBERT BOSCH GMBH