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Method for determining state of charge of battery system, battery system

A battery system and state of charge technology, applied in the direction of secondary battery charging/discharging, battery circuit devices, secondary batteries, etc., can solve the problems of excessive sizing and cost increase, and achieve improved usability, reduced current consumption, and low cost Effect

Pending Publication Date: 2022-03-15
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With a usable capacity of 20Ah, oversizing and cost increase by about 30%

Method used

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  • Method for determining state of charge of battery system, battery system
  • Method for determining state of charge of battery system, battery system
  • Method for determining state of charge of battery system, battery system

Examples

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Embodiment Construction

[0040] In the following description of embodiments of the invention, identical or similar elements are identified with the same reference numerals, a repeated description of these elements being omitted in individual cases. The figures show only schematically the subject matter of the present aspect.

[0041] figure 1 A schematic diagram of a battery system 10 for supplying energy to an on-board electrical network of a vehicle, for example a 12V on-board electrical network, is shown. The battery system 10 is provided here to carry out the method proposed according to the invention.

[0042] The battery system 10 here includes a positive battery terminal 12 and a negative battery terminal 14 . Furthermore, the battery system 10 includes four battery cells 16 interconnected in series and a battery management system 18 for monitoring and controlling the battery system 10 .

[0043] Additionally, the battery system 10 includes a safety disconnect switch 20 for isolating the bat...

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Abstract

The invention relates to a method for determining a state of charge of a battery system (10) having at least one battery cell (16) and an additional energy store (24), which is connected in series to the at least one battery cell (16) and can be switched on and off. According to the invention, the method comprises the following method steps: switching on the additional energy store (24); measuring the voltage of the additional energy store (24) at a predetermined time interval; -ascertaining a change in capacity of the additional energy store (24) on the basis of the measured voltage of the additional energy store (24) and a voltage characteristic curve; ascertaining a charging amount per unit time of the additional energy store (24) as a function of the ascertained change in capacity of the additional energy store (24); and ascertaining the state of charge of the battery system (10) on the basis of the ascertained charge amount per unit time.

Description

technical field [0001] The invention relates to a method for ascertaining the state of charge of a battery system having at least one battery cell and an additional energy store which is connected in series with the at least one battery cell and can be switched on and off. able to disconnect. The invention also relates to a battery system which is designed to carry out the method proposed according to the invention. [0002] Furthermore, the invention relates to a vehicle which is designed to carry out the method proposed according to the invention and / or which comprises the battery system proposed according to the invention. Background technique [0003] In vehicles today, 12V / 24V lead-acid batteries are mostly used to ensure the safety-relevant components during driving (such as brake assistance, steering assistance, automatic steering / braking in the case of highly automated driving) Supply and ensure supply to the controller which is always awakened again in the parking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44H01M10/48
CPCH01M10/441H01M10/4285H01M10/4207H01M10/4257H01M10/446H01M10/482H02J7/0048G01R31/3842G01R31/396G01R31/3828B60R16/033
Inventor A·伊姆勒
Owner ROBERT BOSCH GMBH
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