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Battery controller

A battery control and battery pack technology, applied in the direction of control devices, battery/fuel cell control devices, measurement devices, etc., can solve problems such as battery degradation, heat generation or fire

Inactive Publication Date: 2014-06-11
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the so-called overcharged state in which the charge exceeds the storable capacity and the so-called overdischarged state in which the discharge continues from a state with no stored power are states that lead to deterioration of the storage battery, and there may be heat generation or discharge due to overcharge or overdischarge. Dangerous situations such as fire

Method used

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Examples

Experimental program
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Embodiment 1

[0050] In this embodiment, the maximum storage capacity C which is the maximum storage capacity among all the battery cells 111 constituting the battery pack 110 MAX At the preset upper limit storage capacity C USGMAX Under the above conditions, let the storage capacity of the battery pack C PACK and the maximum storage capacity C MAX Calculation processing is performed for the same value, and at the minimum storage capacity C which is the minimum storage capacity MIN At the preset lower limit storage capacity C USGMIN Under the following conditions, let the storage capacity of the battery pack C PACK and the minimum storage capacity C MIN Calculation processing is performed for the same value.

[0051] Then, the storage capacity C of each battery cell is lower than the lower limit storage capacity C USGMIN Larger than the upper limit storage capacity C USGMIN In the case of a small normal use range, the average storage capacity (actual average storage capacity) C of ea...

Embodiment 2

[0090] Next, Example 2 will be described.

[0091] In this embodiment, the feature is that the lower limit storage capacity C USGMIN and upper limit storage capacity C USGMAX The usual use range between is divided into three ranges: high SOC range, low SOC range and central SOC range. At the maximum storage capacity C MAX and the minimum storage capacity C MIN In the case of the central SOC range, the average storage capacity C AVE As the storage capacity of the battery pack C PACK to calculate, while at the maximum storage capacity C MAX In the case of high SOC range or the minimum storage capacity C MIN In the case of the low SOC range, as in Example 1, according to the average storage capacity C AVE At the upper limit of the average storage capacity C AVEH and the lower limit of the average storage capacity C AVEL The position between is used to calculate the storage capacity of the battery pack C PACK processing.

[0092] Figure 4 The calculation flow of the st...

Embodiment 3

[0132] Next, Example 3 will be described.

[0133] The characteristic of this embodiment is that the following structure is adopted: only in the high SOC range in Example 2, the average storage capacity ratio S is used to calculate the storage capacity C of the battery pack PACK , while in the middle SOC range and low SOC range, the average storage capacity C AVE As the storage capacity of the battery pack C PACK Calculation processing.

[0134] In the above-mentioned embodiment 1, the average storage capacity ratio S is used for calculation in the entire range of the normal use range. In embodiment 2, the average storage capacity ratio S is used in the two ranges of the high SOC range and the low SOC range. Carry out calculations to calculate the storage capacity C of the battery pack PACK , but this calculation method can also be used only in one of the high storage capacity (high SOC range) or low storage capacity (low SOC range).

[0135] For example, compared with plu...

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PUM

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Abstract

The purpose of the present invention is to provide a battery controller that is capable of controlling the charging and discharging of a battery pack without the amount of stored electricity in individual battery cells, constituting a battery, deviating from a predetermined usage range. The present invention is a battery controller that controls a battery pack (110) constituted by connecting a plurality of battery cells (111), wherein the average amount of actual stored electricity (CAVE), which is the average amount of electricity stored in the plurality of battery cells (111), is calculated on the basis of the individual amount of stored electricity (C) in each of the plurality of battery cells (111); the upper limit of the average amount of stored electricity (CAVEH) and the lower limit of the average amount of stored electricity (CAVEL), which the average amount of stored electricity in the plurality of battery cells (111) may take within a preset usage range, are calculated on the basis of the individual amount of stored electricity (C) and the average amount of actual stored electricity (CAVE) of the plurality of battery cells (111); a rate for the average amount of stored electricity (S), which represents the position of the average amount of actual stored electricity (CAVE) between the upper limit of the average amount of stored electricity (CAVEH) and the lower limit of the average amount of stored electricity (CAVEL), is calculated; and the amount of stored electricity in the battery pack (CPACK) for the battery pack (110) is calculated on the basis of the average amount of actual stored electricity (CAVE), the upper limit of the average amount of stored electricity (CAVEH), the lower limit of the average amount of stored electricity (CAVEL), and the rate for the average amount of stored electricity (S).

Description

technical field [0001] The present invention relates to a battery control device for controlling the storage capacity of a battery pack formed by combining a plurality of battery cells or battery modules. Background technique [0002] In a rechargeable storage battery (secondary battery) represented by a lithium-ion storage battery or a nickel-metal hydride storage battery, it is an ideal state to charge and discharge within the range of its storable capacity. This is because the so-called overcharged state in which the charge exceeds the storable capacity and the so-called overdischarged state in which the discharge continues from a state with no stored power are states that lead to deterioration of the storage battery, and there may be heat generation or discharge due to overcharging or overdischarging. Dangerous situations such as fire. In addition, generally, in order to further prevent battery deterioration, a range smaller than the range of the storable capacity is sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3606G01R31/3658G01R31/36H02J7/0068Y02T10/6278B60L58/13B60L58/14B60L58/15B60L58/16B60L58/18B60L58/22B60L2210/40B60L2240/527B60L2240/529B60L2240/545B60L2240/547B60L2240/549G01R31/382G01R31/396Y02T10/70Y02T10/72
Inventor 五十岚直行大川圭一朗河原洋平
Owner HITACHI AUTOMOTIVE SYST LTD