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Secondary battery system

A technology of secondary battery and single battery, which is applied in the direction of secondary battery, secondary battery charging/discharging, secondary battery repair/maintenance, etc., and can solve problems such as inability to perform equalization action, battery voltage difference, etc.

Inactive Publication Date: 2012-08-15
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] That is, in a region where the battery voltage hardly changes with respect to a change in the state of charge, even if there is a difference in the state of charge between the individual cells, since the difference becomes difficult to stand out as a difference in the battery voltage, effective equalization cannot be performed. Action

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0055] Such as figure 1 As shown, the secondary battery system BS mainly includes a battery pack 1 and a charging device 3 , and includes only the charging device 3 as a device that contributes to the current flowing through the entire battery pack 1 .

[0056] The battery pack 1 is configured by connecting a plurality of cells 1a in series, and in the first embodiment, a case where four cells 1a are connected in series will be described as an example.

[0057] Each unit cell 1 a is a lithium ion battery using a lithium compound (for example, lithium iron phosphate) containing an iron component as a positive electrode active material, and is a so-called secondary battery.

[0058] This battery pack 1 is housed in a battery pack BP together with a battery monitoring device 2 that monitors each single battery 1a.

[0059] The battery monitoring device 2 includes: a voltage measurement unit 2a including an A / D converter for measuring the voltage (cell voltage) of each battery c...

no. 2 Embodiment approach

[0097] Next, use Figure 5 A second embodiment of the present invention will be described.

[0098] In the second embodiment, a load 4 is further added to the secondary battery system BS shown in the first embodiment, and the battery pack 1, the charging device 3, and the load 4 are connected in parallel.

[0099] The load 4 is supplied with operating power from one or both of the battery pack 1 and the charging device 3 . The configurations of the battery pack 1 and the charging device 3 are the same as those of the above-mentioned first embodiment except for the control configuration described later and components related thereto. Figure 5 The same codes are assigned to and described in .

[0100] Also in the secondary battery system BS according to the second embodiment, when the battery voltage of any single cell 1a reaches "3.5V", which is the above-mentioned "set voltage for voltage rise suppression", the battery pack 1 It is the same as that of the above-mentioned f...

no. 3 Embodiment approach

[0116] The secondary battery system BS of this embodiment, such as Figure 7 As schematically shown, a battery pack 1 and a charging device 3 are mainly configured, and a load 4 is connected in parallel to the battery pack 1 and charging device 3 . That is, battery pack 1, charging device 3, and load 4 are connected in parallel.

[0117] The charging device 3 supplies charging power to the battery pack 1 and also supplies operating power to the load 4 . The battery pack 1 receives power for charging from the charging device 3 when the state of charge decreases due to discharge, and supplies power for operation to the load 4 as appropriate.

[0118] The battery pack 1 is configured by connecting a plurality of single cells 1a in series, and in this embodiment, a case where four single cells 1a are connected in series will be described as an example.

[0119] Each unit cell 1 a is a lithium ion battery using a lithium compound (for example, lithium iron phosphate) containing a...

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Abstract

Disclosed is a secondary battery system which, when charging a battery pack in a charger, makes it possible to precisely equalize the voltages of the individual cells without needing to greatly increase the capability of the voltage equalizer device. The disclosed secondary battery system is at least provided with a battery pack (1) configured by connecting multiple single secondary cells (1a), a voltage equalizer (BL) which equalizes the variation of the voltages between the single cells (1a), a charger (3) and a charger controller (CC). The charger controller (CC) is configured such that when the cell voltage of any of the multiple single cells (1a) reaches a set voltage for suppressing voltage rise, the current flowing in the entire battery pack (1) is controlled to become zero or an amount of current at which the variation in voltages between the single cells can be reduced by the aforementioned voltage equalizer. The voltage equalizer (BL) is configured so as to equalize the voltage variation between the single cells in parallel to the control exercised by the charger control device (CC).

Description

technical field [0001] The present invention relates to a secondary battery system for charging a secondary battery, and more particularly to a battery pack comprising at least a plurality of battery cells each serving as a secondary battery connected together, and a voltage for equalizing voltage variations among the battery cells. A secondary battery system comprising an equalizing device, a charging device for charging the battery pack, and a charge control device for controlling charging to the battery pack. Background technique [0002] As a charging method for secondary batteries such as lithium-ion batteries, the so-called constant current-constant voltage charging method is well known. For a battery pack composed of connecting a plurality of single cells that are respectively secondary batteries, if this charging method is used to charge , it is also known that there is a variation in the state of charge among the individual cells. [0003] As described in Patent Do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H01M10/44
CPCH01M10/0525H01M10/441H01M10/482H02J7/0016Y02E60/10
Inventor 川内智弘中村将司小西大助白石刚之
Owner GS YUASA INT LTD
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