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Battery voltage conversion circuit and battery management system

A technology for converting circuit and battery voltage, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve problems such as reduced service life, battery damage, and unbalanced battery capacity, so as to reduce the probability of failure, reduce operating voltage, Effect of Large Voltage Headroom

Active Publication Date: 2015-09-30
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the above, it can be seen that the currents I1-I4 flowing through the individual batteries 11-14 in the existing battery voltage conversion circuit are unbalanced with each other, which will cause unbalanced battery capacity during long-term operation, causing damage to the battery and reducing its capacity. service life

Method used

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  • Battery voltage conversion circuit and battery management system
  • Battery voltage conversion circuit and battery management system
  • Battery voltage conversion circuit and battery management system

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0038] As mentioned in the background art, in the existing battery voltage conversion circuit, the currents flowing through the individual batteries are unbalanced, which will cause unbalanced battery capacity during long-term operation, causing damage to the battery and reducing its service life.

[0039] Based on this, an embodiment of the present application provides a battery voltage conversion circuit, wherein, by collecting the sampling signal of the outp...

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Abstract

The invention discloses a battery voltage conversion circuit and a battery management system. The battery voltage conversion circuit comprises a battery unit, a conversion unit and a compensation unit, wherein the compensation unit comprises a collection module and a transmission module, the collection module is used for collecting sampling signals of any one of a first output branch and all second output branches, and compensating current is generated according to the sampling signals; the transmission module is used for transmitting the compensating current to at least one output branch of the output branches except the collected output branch, then the phenomenon of unbalance of current flowing through a single battery is reduced, and the service life of the battery is long. The working current of a first operational amplifier of each of a second submodule and an Nth submodule adopts a rail-to-rail mode, so that the current of the corresponding operational branch is not required to be compensated; each operational branch comprises a P type transistor arranged on a negative power source pin of the corresponding first operational amplifier, a low-voltage device of the first operational amplifier can obtain higher voltage allowance, and the probability of failure of the first operational amplifier is reduced.

Description

technical field [0001] The invention relates to the field of voltage conversion, and more specifically, to a battery voltage conversion circuit and a battery management system. Background technique [0002] refer to figure 1 Shown is an existing battery voltage conversion circuit, wherein the battery voltage conversion circuit includes a plurality of batteries 11-14 connected in series, and conversion sub-modules 21-24 respectively connected to a single battery 11-14. Wherein, the conversion sub-module 21 includes a resistor R1, and the resistor R1 is used as an output branch; the conversion sub-modules 22-24 all include an operational amplifier OPA, a P-type transistor PMOS, a resistor R2 and a resistor R3, and the resistor R2 , P-type transistor PMOS and resistor R3 are an output branch. [0003] Among them, refer to figure 1 As shown, taking the operating current Ia of the operational amplifier in the conversion sub-module 22-24 as an example and the branch current Ic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 汤小虎
Owner CRM ICBG (WUXI) CO LTD
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