GB2305292A - Pressure sensing device located within a sealed cell wall controls charging current - Google Patents
Pressure sensing device located within a sealed cell wall controls charging current Download PDFInfo
- Publication number
- GB2305292A GB2305292A GB9519043A GB9519043A GB2305292A GB 2305292 A GB2305292 A GB 2305292A GB 9519043 A GB9519043 A GB 9519043A GB 9519043 A GB9519043 A GB 9519043A GB 2305292 A GB2305292 A GB 2305292A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- cell
- charging current
- switch
- charging
- 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
Links
Classifications
-
- 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
- H01M10/445—Methods for charging or discharging in response to gas pressure
-
- 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
-
- 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
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/00719—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to degree of gas development in the battery
-
- 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
- H01M50/574—Devices or arrangements for the interruption of current
-
- 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
The charging current supplied to a rechargeable electrochemical cell e.g. a NiCd, NiMH battery by a charger is controlled by a pressure sensing device located within a sealed cell wall of the cell an increase in the pressure within the cell wall is indicative of the cell becoming fully charged and the charging current is controlled in response to the pressure sensing device in order to prevent overcharging of the battery. The pressure sensing device may be a pressure sensitive switch or an active sensor, and control means incorporated in the battery or sensor may disconnect the charging current in response thereto, or the control means may be adapted to vary the charging current in response to pressure variations prior to final disconnection of the current. Alternatively, a pressure sensitive switch may be adapted to disconnect the current directly. Pressure sensitive switch 30 comprises fixed contact 32 located in and electrically isolated from cell wall 34 and a second contact consisting of a flexible dome 38 located on the interior of the cell wall and which will deform to close the switch at a predetermined cell pressure.
Description
RECHARGING ELECTRICAL CELLS
This invention relates to improvements in or relating to rechargeable electrical cells (or "batteries"). More particularly, the invention relates to improved methods and apparatus for controlling the recharging of electrical cells.
With the increasing use of rechargeable electrical cells as power sources for portable electronic equipment, including telephones, computers etc., it is important for such cells to be capable of being recharged as rapidly as possible. However, electrical cells are liable to damage by overcharging. Accordingly, rapid charging schemes require means for detecting when the cell is fully charged and for disconnecting the charging current so as to avoid damage to the cell.
Conventionally, the end of charge is detected by monitoring the cell voltage.
Typically, the rate of change of the voltage reduces as the cell approaches its maximum charge, and then the voltage begins to drop. The changes in voltage which must be detected in order to determine that the cell is fully charged are relatively subtle, so that relatively complex algorithms are required to monitor the voltage and to control the charger in response thereto. This increases the complexity and cost of the charging equipment. Charge cut-off systems relying on voltage monitoring also tend to respond only after there has been at least a minimal degree of overcharging, so that there tends to be incremental damage to the cell on each charging cycle.
In accordance with a first aspect of the present invention there is provided a rechargeable electrochemical cell of the type having a sealed cell wall, including pressure sensing means for sensing the pressure within said sealed wall whereby a charging current applied to the cell may be controlled in response to pressure variations within the cell.
Preferably, said pressure sensing means is adapted to provide an indication when said pressure exceeds a predetermined threshold value.
The pressure sensing means may comprise a pressure sensitive switch which operates when the pressure exceeds the predetermined threshold. If the switch is normally open, then the closure of the switch may be detected by associated control means and the charging current to the cell disconnected in response thereto. If the switch is normally closed, the opening of the switch may also be detected in the same way, or the switch may be incorporated in the charging circuit in order to disconnect the charging current directly.
Alternatively, the pressure sensing means may comprise an active sensor adapted to generate a signal which varies with the pressure. Such a signal may be monitored by associated control means and the charging current disconnected when the signal indicates that the pressure has exceeded the predetermined threshold. In this case, the charging current may also be varied in response to variations in said signal prior to final disconnection of the current once the signal indicates that said threshold has been exceeded.
Where the pressure sensor is a normally open switch, said switch may comprise a first, fixed contact located in said cell wall and a second, flexible contact located inside said cell wall and adapted to deform in response to said pressure, such that the switch is closed when said pressure reaches said predetermined threshold value. Preferably, the second contact comprises a flexible, conductive dome attached to the interior of said cell wall and enclosing said first contact. Preferably also, said first contact is electrically isolated from said cell wall.
Control means responsive to the pressure sensing means could be incorporated into the cell, or may be included in associated charging apparatus.
In accordance with a second aspect of the invention, there is provided charging apparatus for use with a rechargeable electrochemical cell in accordance with the first aspect of the invention, said apparatus including means for generating a charging current and means for connecting said charging current to said cell, and further including control means responsive to the pressure sensing means of said cell for controlling the charging current in response to pressure variations within the cell.
Preferably, the control means operate to disconnect the charging current when said pressure exceeds a predetermined threshold. Where the pressure sensing means of the cell comprises a pressure sensitive switch, the control means of the charging apparatus is preferably adapted to disconnect the charging current in response to operation of said switch.
Alternatively, the pressure sensing means of the cell comprises a sensor adapted to generate a signal which varies with said pressure and the control means of the charging apparatus is adapted to monitor said signal and to disconnect the charging current when the signal indicates that the pressure has exceeded the predetermined threshold.
In this case, the charging current may also be varied in response to variations in said signal prior to final disconnection of the current once the signal indicates that said threshold has been exceeded.
In accordance with a third aspect of the invention, there is provided a method of charging a rechargeable electrochemical cell of the type having a sealed cell wall, comprising the steps of applying a charging current to the cell, monitoring the pressure within said cell wall while the charging current is applied, and controlling the charging current in response to pressure variations within the cell.
Preferably, the charging current is disconnected when said pressure exceeds a predetermined threshold value.
The pressure may be monitored by means of a pressure sensitive switch located within said cell wall and the charging current disconnected in response to operation of said switch.
Alternatively, the pressure may be monitored by means of a sensor adapted to generate a signal which varies with said pressure and the charging current disconnected when the signal indicates that the pressure has exceeded the predetermined threshold. In this case, the charging current may also be varied in response to variations in said signal prior to final disconnection of the current once the signal indicates that said threshold has been exceeded.
The voltage variations detected by conventional battery chargers are caused by increased pressure within the battery resulting from the evolution of gases from the cell materials as the cell becomes fully charged. Monitoring the pressure change provides a more direct indication of the battery becoming fully charged than is the case with voltage monitoring. Controlling the charging current on the basis of a predetermined pressure threshold also allows a very simple control algorithm to be employed. Alternatively, monitoring a continuously varying pressure-representative signal allows the charging current to be controlled in a more sophisticated manner.
The invention is particularly applicable to NiCd and NiMH batteries, but also to other types of rechargeable batteries which exhibit similar variations in cell pressure during charging.
Embodiments of the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a schematic block diagram illustrating a first embodiment of an
arrangement of a battery and a battery charger in accordance with the
invention;
Figure 2 is a schematic block diagram illustrating a second embodiment of
an arrangement of a battery and a battery charger in accordance with the
invention;
Figure 3 is a schematic sectional view of an example of a pressure sensitive
switch installed in the cell wall of a battery in accordance with the present
invention.
Referring now to the drawings, Figure 1 shows a rechargeable battery 10 with its positive and negative terminals connected to a battery charger 12, whereby a charging current may be applied to the battery 10 by the charger 12.
The battery 10 is of a type which includes a closed cell wall, and incorporates a pressure sensing device 14 responsive to changes in pressure within the cell wall.
In this embodiment, the pressure sensing device 14 is connected to control means 16, the control means 16 also being connected to the charger 12. The pressure within the cell wall typically increases as the cell becomes fully charged. The control means 16 is responsive to the pressure sensing device 14 and is adapted to control the charger 1 2 so as to disconnect the charging current from the battery 10 when a predetermined pressure condition indicative of the battery becoming fully charged is detected by the pressure sensing device 14.
The pressure sensing device 14 may comprise any suitable type of pressure sensor.
If the device 14 is an active sensor which generates a signal which varies with the cell pressure, then the control means may include level detection means or comparator means or the like together with logic means for determining when charging current should be disconnected in response to the signal. Suitable control means may be implemented using solid state electronics, for example, in any of a variety of ways which will be apparent to those skilled in the art. In this case, the control means may be further adapted to vary the charging current in response to variations in the pressure-representative signal prior to final disconnection of the charging current once the predetermined threshold has been exceeded.
Alternatively, the pressure sensing device may comprise a pressure sensitive switch which opens or closes when the cell pressure crosses a predetermined threshold level. In this case the control means 16 need only be capable of detecting whether the switch is open or closed in order to determine when the charging current is to be disconnected. Again, means for detecting the state of the switch and for controlling the charging current in response thereto will be apparent to those skilled in the art.
The control means 16 would typically be incorporated into the charging device, but could alternatively form part of the battery. In this case the control means would control switch means (not shown) associated with one or both of the battery terminals so as to disconnect the charging current in response to the pressure sensing device.
Where a "normally closed" pressure sensitive switch is used as the pressure sensing device (ie a switch which opens when the pressure threshold is reached), the switch may be associated with one or both of the battery terminals so that the opening of the switch itself disconnects the charging current directly.
Such an arrangement is illustrated schematically in Figure 2, where the battery 20 incorporates a normally closed pressure sensitive switch 24 in circuit with one of the battery terminals so as to interrupt the charging current from the charger 22 when the predetermined pressure threshold is reached. This allows the separate control means 16 of Figure 1 to be omitted. In this case the benefits of the pressure controlled charging cycle could be obtained using a conventional charger, since the disconnection of the charging current is performed by the battery itself.
Figure 3 shows an example of a normally open pressure sensitive switch 30 suitable for the purposes of the invention. The switch is similar to "keypad" type switches, and comprises a first, fixed contact 32 located in the cell wall 34 of the battery and electrically isolated therefrom by insulation material 36, and a second contact in the form of a flexible dome 38, typically of polymeric material which is either electrically conductive or coated with electrically conductive material, located on the interior of the cell wall 32 so as to enclose the fixed contact.
The dome 38 will deform under pressure generated in the interior of the cell, and at a predetermined pressure will contact the fixed contact 32, thereby closing the switch. The switch contacts 32 and 38 would be connected by any suitable means to control means adapted to detect the closing of the switch and to disconnect the charging current in response thereto, as discussed above in relation to Figure 1.
The cell wall itself may provide one of the connections for the switch. If required, the insulation material 36 might be perforated with one or more vent holes or may be gas permeable, so as to facilitate the deformation of the dome 38 in response to internal cell pressure.
Claims (20)
1. A rechargeable electrochemical cell of the type having a sealed cell wall, including pressure sensing means for sensing the pressure within said sealed wall whereby a charging current applied to the cell may be controlled in response to pressure variations within the cell.
2. A rechargeable electrochemical cell as claimed in Claim 1, wherein said pressure sensing means is adapted to provide an indication when said pressure exceeds a predetermined threshold value.
3. A rechargeable electrochemical cell as claimed in Claim 2, wherein said pressure sensing means comprises a pressure sensitive switch which operates when the pressure exceeds said predetermined threshold value.
4. A rechargeable electrochemical cell as claimed in Claim 3, wherein said switch is normally open.
5. A rechargeable electrochemical cell as claimed in Claim 3, wherein said switch is normally closed.
6. A rechargeable electrochemical cell as claimed in Claim 5, wherein said switch is arranged so as to be incorporated in the charging circuit when said battery is connected to charging means in order to disconnect the charging current directly.
7. A rechargeable electrochemical cell as claimed in Claim 1 or claim 2, wherein said pressure sensing means comprises an active sensor adapted to generate a signal which varies with said pressure.
8. A rechargeable electrochemical cell as claimed in Claim 4, wherein said switch comprises a first, fixed contact located in said cell wall and a second, flexible contact located inside said cell wall and adapted to deform in response to said pressure, such that the switch is closed when said pressure reaches said predetermined threshold value.
9. A rechargeable electrochemical cell as claimed in Claim 8, wherein said second contact comprises a flexible, conductive dome attached to the interior of said cell wall and enclosing said first contact.
10. A rechargeable electrochemical cell as claimed in Claim 9, wherein said first contact is electrically isolated from said cell wall.
11. Charging apparatus for use with a rechargeable electrochemical cell as claimed in any one of Claims 1 to 10, said apparatus including means for generating a charging current and means for connecting said charging current to said cell, and further including control means responsive to the pressure sensing means of said cell for controlling the charging current in response to pressure variations within the cell.
1 2. Charging apparatus as claimed in Claim 11, wherein said control means is adapted to disconnect the charging current when said pressure exceeds a predetermined threshold.
13. Charging apparatus as claimed in claim 12, wherein the pressure sensing means of the cell comprises a pressure sensitive switch and wherein the control means of the charging apparatus is adapted to disconnect the charging current in response to operation of said switch.
14. Apparatus as claimed in Claim 12, wherein the pressure sensing means of the cell comprises a sensor adapted to generate a signal which varies with said pressure and wherein the control means of the charging apparatus is adapted to monitor said signal and to disconnect the charging current when the signal indicates that the pressure has exceeded the predetermined threshold.
15. Apparatus as claimed in Claim 14, wherein said control means is further adapted to vary the charging current in response to variations in said signal prior to final disconnection of the current once the signal indicates that said threshold has been exceeded.
16. A method of charging a rechargeable electrochemical cell of the type having a sealed cell wall, comprising the steps of applying a charging current to the cell, monitoring the pressure within said cell wall while the charging current is applied, and controlling the charging current in response to predetermined pressure variations within the cell.
17. A method as claimed in Claim 16, wherein the charging current is disconnected when said pressure exceeds a predetermined threshold value.
18. A method as claimed in Claim 17 wherein said pressure is monitored by means of a pressure sensitive switch located within said cell wall and wherein the charging current is disconnected in response to operation of said switch.
19. A method as claimed in Claim 16, wherein said pressure is monitored by means of a sensor adapted to generate a signal which varies with said pressure and wherein the charging current is disconnected when the signal indicates that the pressure has exceeded the predetermined threshold.
20. A method as claimed in Claim 19, wherein the charging current is varied in response to variations in said signal prior to final disconnection of the current once the signal indicates that said threshold has been exceeded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9519043A GB2305292B (en) | 1995-09-18 | 1995-09-18 | Recharging electrical cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9519043A GB2305292B (en) | 1995-09-18 | 1995-09-18 | Recharging electrical cells |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9519043D0 GB9519043D0 (en) | 1995-11-15 |
| GB2305292A true GB2305292A (en) | 1997-04-02 |
| GB2305292B GB2305292B (en) | 1999-02-10 |
Family
ID=10780880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9519043A Expired - Fee Related GB2305292B (en) | 1995-09-18 | 1995-09-18 | Recharging electrical cells |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2305292B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1073132A1 (en) * | 1999-07-30 | 2001-01-31 | IMPLEX Aktiengesellschaft Hearing Technology | Secondary electrochemical cell |
| EP1126535A2 (en) * | 2000-02-18 | 2001-08-22 | NTK Powerdex, Inc. | Safety device for lithium-ion-polymer battery |
| WO2015135696A1 (en) * | 2014-03-12 | 2015-09-17 | Robert Bosch Gmbh | Sensor housing for a sensor element for detecting at least one physical property of an energy storage cell, sensor, energy storage system, and method for producing a sensor housing of this kind |
| WO2016197713A1 (en) * | 2016-01-08 | 2016-12-15 | 中兴通讯股份有限公司 | Battery deformation detection method and device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB660989A (en) * | 1947-03-14 | 1951-11-14 | Tech Gautrat Bureau | Improvements in electric accumulators |
| GB728870A (en) * | 1952-05-05 | 1955-04-27 | Fulmen | Charge regulating device for banks of electric accumulators |
| GB1204387A (en) * | 1967-11-25 | 1970-09-09 | Dynamic Instr Corp | Improvements in or relating to pressure transducers for use in charging batteries |
| GB1269115A (en) * | 1968-08-07 | 1972-04-06 | Marathon Mfg Company | Fast rechargeable sealed nickel-cadmium battery cells combined with excess pressure and temperature controls |
| GB2058456A (en) * | 1979-09-11 | 1981-04-08 | Lucas Industries Ltd | Monitoring gas pressure during charging of electric storage batteries |
| EP0074444A1 (en) * | 1980-03-05 | 1983-03-23 | Jerome Hal Lemelson | Rechargeable electric battery system |
| JPS62190667A (en) * | 1986-02-14 | 1987-08-20 | Matsushita Electric Ind Co Ltd | Sealed lead-acid battery |
| JPH0449819A (en) * | 1990-06-15 | 1992-02-19 | Nec Corp | Battery charging controller |
| US5260638A (en) * | 1991-10-25 | 1993-11-09 | Fujitsu Limited | Method and circuit for quick charging of secondary cell |
| JPH0676861A (en) * | 1992-08-31 | 1994-03-18 | Shinko Electric Co Ltd | Battery charging device for unmanned conveying vehicle |
-
1995
- 1995-09-18 GB GB9519043A patent/GB2305292B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB660989A (en) * | 1947-03-14 | 1951-11-14 | Tech Gautrat Bureau | Improvements in electric accumulators |
| GB728870A (en) * | 1952-05-05 | 1955-04-27 | Fulmen | Charge regulating device for banks of electric accumulators |
| GB1204387A (en) * | 1967-11-25 | 1970-09-09 | Dynamic Instr Corp | Improvements in or relating to pressure transducers for use in charging batteries |
| GB1269115A (en) * | 1968-08-07 | 1972-04-06 | Marathon Mfg Company | Fast rechargeable sealed nickel-cadmium battery cells combined with excess pressure and temperature controls |
| GB2058456A (en) * | 1979-09-11 | 1981-04-08 | Lucas Industries Ltd | Monitoring gas pressure during charging of electric storage batteries |
| EP0074444A1 (en) * | 1980-03-05 | 1983-03-23 | Jerome Hal Lemelson | Rechargeable electric battery system |
| JPS62190667A (en) * | 1986-02-14 | 1987-08-20 | Matsushita Electric Ind Co Ltd | Sealed lead-acid battery |
| JPH0449819A (en) * | 1990-06-15 | 1992-02-19 | Nec Corp | Battery charging controller |
| US5260638A (en) * | 1991-10-25 | 1993-11-09 | Fujitsu Limited | Method and circuit for quick charging of secondary cell |
| JPH0676861A (en) * | 1992-08-31 | 1994-03-18 | Shinko Electric Co Ltd | Battery charging device for unmanned conveying vehicle |
Non-Patent Citations (3)
| Title |
|---|
| Japio Abstract Section E,Section No.1211,Vol.16,No.240, pg.124 & JP 04 049 819 A * |
| Japio Abstract Section E,Section No.580,Vol.12,No.38,pg.10 & JP 62 190 667 A * |
| WPI Abstract No:94-120652 & JP 06 076 861 A * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1073132A1 (en) * | 1999-07-30 | 2001-01-31 | IMPLEX Aktiengesellschaft Hearing Technology | Secondary electrochemical cell |
| AU746488B2 (en) * | 1999-07-30 | 2002-05-02 | Cochlear Limited | Secondary electrochemical cell |
| US7232625B2 (en) | 1999-07-30 | 2007-06-19 | Cochlear Limited | Secondary electrochemical cell |
| US7713651B2 (en) | 1999-07-30 | 2010-05-11 | Cochlear Limited | Electrochemical cell |
| EP1126535A2 (en) * | 2000-02-18 | 2001-08-22 | NTK Powerdex, Inc. | Safety device for lithium-ion-polymer battery |
| EP1126535A3 (en) * | 2000-02-18 | 2003-01-29 | NTK Powerdex, Inc. | Safety device for lithium-ion-polymer battery |
| WO2015135696A1 (en) * | 2014-03-12 | 2015-09-17 | Robert Bosch Gmbh | Sensor housing for a sensor element for detecting at least one physical property of an energy storage cell, sensor, energy storage system, and method for producing a sensor housing of this kind |
| WO2016197713A1 (en) * | 2016-01-08 | 2016-12-15 | 中兴通讯股份有限公司 | Battery deformation detection method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2305292B (en) | 1999-02-10 |
| GB9519043D0 (en) | 1995-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030918 |