GB2526064A - Secondary battery with an overcharge protection circuit - Google Patents

Secondary battery with an overcharge protection circuit Download PDF

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Publication number
GB2526064A
GB2526064A GB1407656.6A GB201407656A GB2526064A GB 2526064 A GB2526064 A GB 2526064A GB 201407656 A GB201407656 A GB 201407656A GB 2526064 A GB2526064 A GB 2526064A
Authority
GB
United Kingdom
Prior art keywords
heat dissipation
secondary battery
overcharge
battery case
dissipation plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1407656.6A
Other versions
GB201407656D0 (en
GB2526064B (en
Inventor
Donald Pi Hsiang Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Energy Control Ltd
Original Assignee
Energy Control Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Energy Control Ltd filed Critical Energy Control Ltd
Priority to GB1407656.6A priority Critical patent/GB2526064B/en
Publication of GB201407656D0 publication Critical patent/GB201407656D0/en
Publication of GB2526064A publication Critical patent/GB2526064A/en
Application granted granted Critical
Publication of GB2526064B publication Critical patent/GB2526064B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

A secondary battery with an overcharge protection device includes a battery case 20 with a chamber 21 for holding a plurality of secondary battery cells 10; a heat dissipation plate 30 fixed to the battery case 20; and an overcharge discharge device 400 disposed in the battery case 20 and including a plurality of overcharge discharge modules electrically connected to the secondary battery cells. Each overcharge discharge module includes a balance resistor fixed to the heat dissipation plate. The battery case and the heat dissipation plate are made of metal, the balance resistors are cement resistors, a plurality of first connectors 50 are electrically connected to the overcharge discharge modules, and a plurality of second connectors 60 are electrically connected to the cement resistors 41 and removably fixed to a corresponding one of the first connectors 50. Other components include heat dissipation grooves 413, heat conduction surface 411, circuit board 401, heat dissipation space 33, connecting portions 23, 32 and voltage detecting unit 44.

Description

SECONDARY BATTERY WITH AN OVERCHARGE PROTECTION
DEVICE
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a secondary battery and, more particularly, to a secondary battery with an overcharge protection device.
Description of the Prior Art
The existing secondary battery is usually provided with a BMS (battery management system) which is used to monitor and control the charging process of each battery cells, preventing overcharge and battery damage. However, BMS is quite expensive and unreliable iii quality. Therefore, BMS is replaced with an overcharge protection circuit.
With the overcharge protection circuit, the extra power is shifted to and consumed by the balance resistor, so as to prevent the voltage of the secondary battery from continuously climbing and causing damage to the battery. However, the balance resistor is a low-power resistor, which will produce too much heat energy. Besides, the battery itself will also produce heat energy. When too many secondary battery cells are charged synchronously, and the power is offloaded, the heat produced by the secondary battery will be large enough to adversely affect the charging effect.
Therefore, heat dissipation system is designed to solve this problem, and the most commonly seen heat dissipation system includes heat dissipation path, heat dissipation structure, and a fan. However, the existing heat dissipation systems are mostly independent structures, which make the secondary battery complicated, and the heat dissipation effect is limited.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
SUMMARY OF THE INVENTION
The primary objective of tile present invention is to provide a secondary battery with an overcharge protection device. With the metal made battery case, the heat dissipation plate and the high-power cement resistors mounted on the heat dissipation plate, the second battery of tile present invention, without complicated structure, will provide a good heat dissipation performance and charging effect during charging process, substantially reducing the possibility of high temperature explosion.
To achieve the above objective, a secondary battery with an overcharge protection device in accordance with the present invention comprises: a battery case with a chamber for holding a plurality of secondary battery cells; a heat dissipation plate fixed to the battery case; and an overcharge discharge device disposed in the battery case and including a plurality of overcharge discharge modules electrically connected to the secondary battery cells, the number of the overcharge discharge modules being equal to that of the secondary battery cells, and each of the overcharge discharge modules including a balance resistor which is fixed to the heat dissipation plate and used to consume electric power.
The secondary battery with an overcharge protection device is characterized in that: the battery case and the heat dissipation plate are made of metal, the balance resistors are cement resistors, a plurality of first connectors are electrically connected to the overcharge discharge modules, and a plurality of second connectors are electrically connected to the cement resistors and removably fixed to a corresponding one of the first connectors.
Preferably, the battery case further includes an outer surface, and two spaced apart first connecting portions protruded from the outer surface, the heat dissipation plate includes a heat dissipation portion spaced apart from the outer surface of the battery case, and two second connecting portions formed on the heat dissipation portion and fixed to the first connecting portions, so that the heat dissipation plate and the battery case define a heat dissipation space for passage of liquid.
Preferably, the overcharge discharge device further comprises a circuit board which is disposed at an entrance of the chamber of the battery case and provided for electrical connection of the overcharge discharge modules and the secondary battery cells.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. I is an exploded view of a secondary battery with an overcharge protection device in accordance with the present invention; Fig. 2 is an assembly view of the secondary battery with the overcharge protection device in accordance with the present invention; Fig. 3 is a top view of the secondary battery with the overcharge protection device in accordance with the present invention; and Fig. 4 is a cross sectional view of the secondary battery with the overcharge protection device in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention will be clearer from the following description when viewed together with the accompanying drawings, winch show, for purpose of illustration only, the preferred embodiment in accordance with the present invention.
Referring to Figs. 1-3, a secondary battery with an overcharge protection device in accordance with the present invention comprises: a battery case 20, a heat dissipation plate 30, an overcharge discharge device 400, a plurality of first connectors 50, and a plurality of second connectors 60.
The battery case 20 is made of metal with good heat dissipation performance and includes a chamber 21 for holding a plLtrality of secondary battery cells 10. In this embodiment, there are four secondary battery cells 10, and the battery case 20 further includes an outer surface 22, and two spaced apart first connecting portions 23 protruded from the outer surface 22.
The heat dissipation plate 30 is made of metal with good heat dissipation performance and fixed to the battery case. In this embodiment, the heat dissipation plate 30 includes a heat dissipation portion 31 spaced apart from the outer surface 22 of the battery case 20, and two second connecting portions 32 formed on the heat dissipation portion 31 and fixed to the first connecting portions 23, so that the heat dissipation plate 30 and the battery case 20 define a heat dissipation space 33 for passage of liquid. The first and second connecting portions 23, 32 are fixed together by screws 34.
The overcharge discharge device 400 is disposed in the battery case 20 and includes a plurality of overcharge discharge modules 40 electrically connected to the secondary battery cells 10. The number of the overcharge discharge modules 40 is equal to that of the secondary battery cells 10, and each of the overcharge discharge modules 40 includes a balance resistor which is fixed to the heat dissipation plate 30 and used to consume electric power Tn this embodiment, each of the balance resistors is a cement resistor 41. The cement resistor 41 is fixed to the heat dissipation portion 31 of the heat dissipation plate 30, located in the heat dissipation space 33, and includes a heat conduction surface 4!] abutted against the heat dissipation plate 30, two locking portions 12 fixed to the heat dissipation plate 30 by screws 42, and a plurality of heat dissipation grooves 413.
Each of the first connectors 50 is electrically connected to a corresponding one of the overcharge discharge modules 40.
Each of the second connectors 60 is electrically connected to a corresponding one of the cement resistors 41 and removably fixed to a corresponding one of the first connectors 50.
Since the battery case 20 and the heat dissipation plate 30 are made of metal with good heat dissipation performance, when each of the secondary battery cells 10 is overcharged, the heat energy produced by the secondary battery cells 10 will be absorbed by the battery case 20 and dissipated into surrounding air via the outer surface, so as to quckly reduce the temperature of the respective secondary battery cells 10 during the charging process. When each of the secondary battery cells 10 is overcharged during charging process, the cement resistors 41 of the overcharge discharge modules 40 will consume electric power. At this moment, the heat dissipation grooves 413 will dissipate the heat energy converted from electric power into surround air, and the heat conduction surface 411 will also bring the heat energy to the heat dissipation plate 30, so that the heat energy can be quickly dissipated into surrounding air by the heat dissipation plate 30, and the temperature of the cement resistors 41 is effectively lowered. With the metal made battery case 20, the heat dissipation plate 30 and the high-power cement resistors 41 mounted on the heat dissipation plate 30, the second battery of the present invention, without complicated structure, will provide a good heat dissipation performance and charging effect during charging process, substantially reducing the possibility of high temperature explosion.
It is to bc notcd that, with the metal made battery case 20, the hcat dissipation plate 30 and the high-power cement resistors 41 mounted on the heat dissipation plate 30, the second battery of the present invention does not need extra heat dissipation system, therefore it is simply structured and easy to manufacture.
In addition, the cement resistors 41 on the heat dissipation plate 30 are electrically connected to the first connectors 50 of the overcharge discharge modules via the second connectors 60, and the first and second connectors 50, 60 are connected in a removable manner, which makes the maintenance and assembly of the secondary battery of the present invention much convenient.
It is to be noted that the overcharge discharge device 400 further comprises a circuit board 401 which is disposed at the entrance of the chamber 21 of the battery case 20 and provided for electrical connection of the overcharge discharge modules and the secondary battery cells 10. Each of the overcharge discharge modules 40 comprises a semiconductor switch 43 as a discharge switch, and a voltage detecting unit 44 for detecting the voltage of the secondary battery cells 10. Since the voltage detecting unit 44 and the semiconductor switch 43 are of conventional technology, frirther explanations are omitted. The circuit board 401 ftmrther comprises a positive electrode 402 and a negative electrode 403 as power output terminals of the secondary battery.

Claims (4)

  1. WHAT IS CLAIMED IS: 1. A secondary battery with an overcharge protection device comprising: a battery case with a chamber for holding a plurality of secondary battery cells; a heat dissipation plate fixed to the battety case; an overcharge discharge device disposed in the battery case and including a plurality of overcharge discharge modules electrically connected to the secondary battery cells, the number of the overcharge discharge modules being equal to that of the secondary battery cells, and each of the overcharge discharge modules including a balance resistor which is fixed to the heat dissipation plate and used to consume electric power; characterized iii that: the battery case and the heat dissipation plate are made of metal, the balance resistors are cement resistors, a plurality of first connectors are electrically connected to the overcharge discharge modules, and a plurality of second connectors are electrically connected to the cement resistors and removably fixed to a corresponding one of the first connectors.
  2. 2. The secondary battery with the overcharge protection device as claimed in claim 1, wherein the battery case further includes an outer surface, and two spaced apart first connecting portions protruded from the outer surface, the heat dissipation plate includes a heat dissipation portion spaced apart from the outer surface of the battery case, and two second connecting portions formed on the heat dissipation portion and fixed to the first connecting portions, so that the heat dissipation plate and the battery case define a heat dissipation space for passage of liquid.S
  3. 3. The secondary battery with the overcharge protection device as claimed in claim 1, wherein the overcharge discharge device further comprises a circuit board which is disposed at an entrance of the chamber of the battery case and provided for electrical connection of the overcharge discharge modules and the secondary battery cells.
  4. 4. A secondary battery with an overcharge protection device substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB1407656.6A 2014-05-01 2014-05-01 Secondary battery with an overcharge protection device Active GB2526064B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1407656.6A GB2526064B (en) 2014-05-01 2014-05-01 Secondary battery with an overcharge protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1407656.6A GB2526064B (en) 2014-05-01 2014-05-01 Secondary battery with an overcharge protection device

Publications (3)

Publication Number Publication Date
GB201407656D0 GB201407656D0 (en) 2014-06-18
GB2526064A true GB2526064A (en) 2015-11-18
GB2526064B GB2526064B (en) 2020-11-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2539921A (en) * 2015-07-01 2017-01-04 Energy Control Ltd Secondary battery with an overcharge protection device
GB2588393A (en) * 2019-10-18 2021-04-28 Xerotech Ltd A sensor carrier for a battery pack

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2349284A (en) * 1999-04-22 2000-10-25 Aea Technology Plc Preventing overcharge of lithium cells
US20010019256A1 (en) * 2000-03-01 2001-09-06 Olsson Dan Hakan Lennart Method and device for balancing charges of a plurality of series-connected battery cells
WO2013053802A1 (en) * 2011-10-13 2013-04-18 Continental Automotive Gmbh Method for balancing storage cells of a storage device, and storage system for carrying out the method
US8465864B1 (en) * 2012-02-07 2013-06-18 Hyundai Motor Company Heat dissipation plate for battery cell module and battery cell module having the same
FR2992787A3 (en) * 2012-07-02 2014-01-03 Renault Sa Discharge device for battery module in battery pack of electric and/or hybrid car, has switching unit connecting each resistor to battery module independent of other resistors in decreasing order of resistance values of resistors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2349284A (en) * 1999-04-22 2000-10-25 Aea Technology Plc Preventing overcharge of lithium cells
US20010019256A1 (en) * 2000-03-01 2001-09-06 Olsson Dan Hakan Lennart Method and device for balancing charges of a plurality of series-connected battery cells
WO2013053802A1 (en) * 2011-10-13 2013-04-18 Continental Automotive Gmbh Method for balancing storage cells of a storage device, and storage system for carrying out the method
US8465864B1 (en) * 2012-02-07 2013-06-18 Hyundai Motor Company Heat dissipation plate for battery cell module and battery cell module having the same
FR2992787A3 (en) * 2012-07-02 2014-01-03 Renault Sa Discharge device for battery module in battery pack of electric and/or hybrid car, has switching unit connecting each resistor to battery module independent of other resistors in decreasing order of resistance values of resistors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2539921A (en) * 2015-07-01 2017-01-04 Energy Control Ltd Secondary battery with an overcharge protection device
GB2539921B (en) * 2015-07-01 2021-09-22 Energy Control Ltd Secondary battery with an overcharge protection device
GB2588393A (en) * 2019-10-18 2021-04-28 Xerotech Ltd A sensor carrier for a battery pack

Also Published As

Publication number Publication date
GB201407656D0 (en) 2014-06-18
GB2526064B (en) 2020-11-18

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