CN111162219A - Battery PACK of electricity core monomer cluster and parallel combination - Google Patents
Battery PACK of electricity core monomer cluster and parallel combination Download PDFInfo
- Publication number
- CN111162219A CN111162219A CN202010055781.XA CN202010055781A CN111162219A CN 111162219 A CN111162219 A CN 111162219A CN 202010055781 A CN202010055781 A CN 202010055781A CN 111162219 A CN111162219 A CN 111162219A
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- Prior art keywords
- battery
- connection part
- cell
- battery pack
- electrode tab
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- 239000000178 monomer Substances 0.000 title description 7
- 230000005611 electricity Effects 0.000 title description 2
- 239000010410 layer Substances 0.000 claims description 25
- 239000012792 core layer Substances 0.000 claims description 24
- 230000007774 longterm Effects 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
A battery PACK with single battery cells connected in series and in parallel comprises a box body, a battery cell layer and an electric control assembly, wherein the battery cell layer and the electric control assembly are arranged in the box body, the battery cell layer is connected with the electric control assembly, the battery cell layer comprises a plurality of battery cell rows connected in series, the battery cell rows comprise a plurality of battery cell groups connected in series, and the battery cell groups comprise a plurality of battery cells connected in parallel; and the battery cell is provided with a positive pole column and a negative pole column. Compared with the prior art, the battery PACK formed by the serial-parallel combination of the battery cells provided by the invention has the following advantages: the battery cells are connected in series and parallel, the assembly is flexible and convenient, the efficiency is high, and the problems that the square series busbar in the prior art is large in size and the current-carrying capacity is wasted are solved; and the processing difficulty of the special-shaped bus bar is high, the sectional areas of different positions of the bus bar are different, the balance among the electric cores is not easy to control, and the balance of the electric cores is influenced after long-term use.
Description
Technical Field
The invention relates to a battery PACK, in particular to a battery PACK formed by combining a battery cell monomer in a serial-parallel mode.
Background
At present, the electric core that uses among lithium cell fork truck battery PACK mainly divide into two big types, and electric core monomer and electric core module no matter which type, the purpose all is for battery PACK provides corresponding voltage and electric quantity to guarantee the supply of power.
The advantage of using electric core module is that the reliability is higher, and it is convenient to connect, but the module shaping adds man-hour, and processing cost is also higher relatively, and the module current-carrying capacity is limited great, also has certain requirement to battery PACK's space. Therefore, when the number of the required battery cores is not high, the size is limited to be more, and the requirement on the current-carrying capacity is higher, the battery core monomers are used for serial-parallel combination, so that the battery core is a good choice.
When the required electric quantity is large, the lithium battery monomers need to be connected in parallel and then connected in series, the serial bus bar is large in simple shape, and the phenomenon of current-carrying capacity waste exists; the special-shaped bus bar is not beneficial to processing, the sectional areas of different positions of the bus bar are different, the balance among the battery cores is not easy to control, and the long-term use and the balance of the whole pack can be slightly influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the battery PACK with a simple structure, easy processing, easy assembly, balanced current-carrying capacity and good stability, wherein the battery cells are formed by series-parallel combination of single cells.
The battery PACK with the series-parallel combination of the battery cells provided by the invention adopts the following main technical scheme: the battery cell line comprises a box body, a battery cell layer and an electric control assembly, wherein the battery cell layer and the electric control assembly are arranged in the box body, the battery cell layer is connected with the electric control assembly, the battery cell layer comprises a plurality of battery cell lines which are connected in series, the battery cell line comprises a plurality of battery cell groups which are connected in series, and the battery cell groups comprise a plurality of battery cells which are connected in parallel; the battery cell is provided with a positive pole column and a negative pole column;
the positive pole posts of a plurality of electric cores in the same electric core group are connected through positive pole splicing, and the negative pole posts of a plurality of electric cores in the same group are connected through negative pole splicing;
in two adjacent electric core groups, the negative pole tab in one electric core group is connected with the positive pole tab in the other electric core group through the first bridging plate;
in two adjacent battery cell rows, the negative electrode connecting piece at one end of the battery cell row is connected with the positive electrode connecting piece at the other end of the battery cell row through the second bridging plate.
The battery PACK with the battery cell monomer serial-parallel combination also adopts the following accessory technical scheme:
at least two battery cell layers which are distributed up and down are arranged in the box body, and in two adjacent battery cell layers, the negative pole splicing piece at the corner of one battery cell layer is connected with the positive pole splicing piece at the corner of the other battery cell layer through a third bridging plate.
The positive electrode connecting piece and the negative electrode connecting piece are of the same structure and are rectangular connecting plates.
The first bridge plate comprises a first connecting part, a second connecting part and a first flexible connecting part positioned between the first connecting part and the second connecting part; when the first bridging plate is connected with two adjacent electric core groups, the first connecting part is connected with the negative pole connecting piece in one electric core group, and the second connecting part is connected with the positive pole connecting piece in the other electric core group.
The longitudinal projection of the first bridging plate is rectangular.
The second bridge plate comprises a third connecting part, a fourth connecting part and a second flexible connecting part for connecting the third connecting part and the fourth connecting part; when the second bridging plate is connected with two adjacent battery cell rows, the third connecting part is connected with the negative electrode connecting piece at one end part of one battery cell row, and the fourth connecting part is connected with the positive electrode connecting piece at the other end part of the other battery cell row.
The second bridge board comprises a first hot-press welding soft bus bar, one end of the first hot-press welding soft bus bar is turned and folded to form the third connecting part, the other end of the first hot-press welding soft bus bar is turned and folded to form the fourth connecting part, the middle part of the first hot-press welding soft bus bar is the second flexible connecting part, and the third connecting part and the fourth connecting part are both perpendicular to the second flexible connecting part; the third connecting part and the fourth connecting part are positioned on the same plane, and the plane where the third connecting part and the fourth connecting part are positioned is parallel to the plane where the second flexible connecting part is positioned.
The third bridge plate comprises a fifth connecting part, a sixth connecting part and a third flexible connecting part for connecting the fifth connecting part and the sixth connecting part; when the third bridge plate is connected with two adjacent electric core layers, the fifth connecting part is connected with the negative electrode connecting piece at the corner of one electric core layer, and the sixth connecting part is connected with the positive electrode connecting piece at the corner of the other electric core layer.
The third bridge plate comprises a second hot-press welding soft busbar, two ends of the second hot-press welding soft busbar are respectively bent towards the same side to form a fifth connecting part and a sixth connecting part respectively, the middle part of the second hot-press welding soft busbar is a third flexible connecting part, and the fifth connecting part and the sixth connecting part are both perpendicular to the third flexible connecting part; the plane of the fifth connecting part is parallel to the plane of the sixth connecting part, and the plane of the fifth connecting part and the plane of the sixth connecting part are both perpendicular to the plane of the third flexible connecting part.
The positive pole post with all be equipped with the screw hole on the negative pole post, positive pole tab the negative pole tab first bridging plate the second bridging plate with the third bridging plate all through the screw with positive pole post with the negative pole post is connected.
And the first flexible connecting part, the second flexible connecting part and the third flexible connecting part are all provided with insulating protective sleeves.
The insulating protective sleeve is a heat shrinkable tube.
Compared with the prior art, the battery PACK formed by the serial-parallel combination of the battery cells provided by the invention has the following advantages: the battery cells are connected in series and parallel, the assembly is flexible and convenient, the efficiency is high, and the problems that the square series busbar in the prior art is large in size and the current-carrying capacity is wasted are solved; the processing difficulty of the special-shaped bus bar is high, the sectional areas of different positions of the bus bar are different, the balance among the electric cores is difficult to control, and the balance of the electric cores is influenced after long-term use; compared with the structure that a plurality of battery cell modules are arranged in the battery box in the prior art, the module forming process is omitted, and the production cost is reduced; and the space in the box is not influenced by the appearance of electric core module, can furthest utilize the space in the battery box to set up electric core quantity and improve duration, and current-carrying capacity is superior to electric core module greatly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of the present invention with the cabinet and the electronic control assembly removed.
Fig. 2 is a structural diagram of the present invention with the case, the electronic control assembly, and a portion of the cell removed.
Fig. 3 is a block diagram of the present invention with the top cover of the cabinet and the electronic control assembly removed.
FIG. 4 is a structural view of a rectangular connecting plate in the present invention.
Fig. 5 is a structural view of a first bridging plate in the present invention.
Fig. 6 is a structural view of a second bridge plate according to the present invention.
Fig. 7 is a structural view of a third bridge plate in the present invention.
Fig. 8 is a view illustrating a state in which the negative electrode tabs of one electric core pack are connected to the positive electrode tabs of the other electric core pack through two first bridging plates, among the two adjacent electric core packs according to the present invention.
Fig. 9 is a diagram showing a state in which the negative electrode tab at the end of one cell row is connected to the positive electrode tab at the end of the other cell row via two second bridge plates, in two adjacent cell rows according to the present invention.
Fig. 10 is a diagram showing a state in which the negative electrode tab at the corner of one cell layer is connected to the positive electrode tab at the corner of the other cell layer through two third bridge plates, among two adjacent cell layers in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1 to 10, the embodiment of the battery PACK in which the battery cells 10 are combined in series and parallel according to the present invention includes a box 1, a battery core layer and an electronic control assembly, wherein the battery core layer is disposed in the box 1 and is connected to the electronic control assembly, the battery core layer includes a plurality of battery cell columns connected in series, the battery cell columns include a plurality of battery cell groups connected in series, and the battery cell groups include a plurality of battery cells 10 connected in parallel; the battery cell 10 is provided with a positive pole column and a negative pole column; the battery cell group in this embodiment includes three battery cells 10 connected in parallel. The positive poles of a plurality of electric cores 10 in the same electric core group are connected through positive pole splicing, and the negative poles of a plurality of electric cores 10 in the same group are connected through negative pole splicing; in two adjacent electric core groups, the negative electrode contact pieces in one electric core group are connected with the positive electrode contact pieces in the other electric core group through two first bridging plates 6; in two adjacent cell rows, the negative electrode tab at the end of one cell row is connected to the positive electrode tab at the end of the other cell row through two second bridging plates 7. The box body 1 and the electric control assembly are mature technologies in the prior art, and detailed description is omitted here; the battery cells 10 are connected in series and parallel in the mode, the assembly is flexible and convenient, the efficiency is high, and the problems that a square series busbar in the prior art is large in size and the current-carrying capacity is wasted are solved; the processing difficulty of the special-shaped bus bar is high, the sectional areas of different positions of the bus bar are different, the balance among the electric cores 10 is difficult to control, and the balance of the electric cores 10 is influenced after long-term use; compared with the structure that a plurality of battery cells 10 are arranged in the battery box in the prior art, the module forming process is omitted, and the production cost is reduced; and the space in the box 1 is not influenced by the appearance of electric core 10 module, can furthest utilize the space in the battery box to set up electric core 10 quantity and improve duration, and the current-carrying capacity is superior to electric core 10 module greatly. When the battery pack is used specifically, a plurality of battery cells can be assembled together by using the fixing sleeve 3, the fixing sleeve 3 is only used as a component for fastening the plurality of battery cells, and the battery cells in the fixing sleeve 3 are not represented as a battery cell group or a battery cell row.
Referring to fig. 1 to fig. 3, according to the above embodiment of the present invention, at least two cell layers are disposed in the box body 1, and in two adjacent cell layers, the negative electrode tab at the corner of one cell layer is connected to the positive electrode tab at the corner of another cell layer through two third bridge plates 8. This embodiment is in be equipped with three electric core layer that are distribution from top to bottom in box 1, including first electric core layer 21, second electric core layer 22 and third electric core layer 23, wherein second electric core layer 22 and third electric core layer 23 are located the coplanar, and second electric core layer 22 and third electric core layer 23 all are located the top of first electric core layer 21, the vertical projection area of first electric core layer 21 is greater than the sum of the vertical projection area of second electric core layer 22 and the vertical projection area of third electric core layer 23, second electric core layer 22 with be formed with automatically controlled subassembly installation position 4 between the third electric core layer 23, the duration of battery box has been improved greatly to this kind of structure to the inner structure of box 1 has been simplified.
Referring to fig. 4 to 10, according to the above embodiment of the present invention, the cross-sectional areas of the positive electrode tab, the negative electrode tab, the first bridging plate 6, the second bridging plate 7, and the third bridging plate 8 are all equal, so that the uniformity of the system current during charging and discharging is ensured, the service life of the battery box is prolonged, and the number of times and the cost of maintenance are reduced.
Referring to fig. 1 to 4, and 8 to 10, according to the above-described embodiment of the present invention, the positive electrode tab and the negative electrode tab have the same structure and are rectangular connecting plates 5. Simple structure, convenient assembly and low production cost.
Referring to fig. 1, 2, 5 and 8, according to the above-described embodiment of the present invention, the first bridge plate 6 includes a first connection portion 61, a second connection portion 62, and a first flexible connection portion 63 between the first connection portion 61 and the second connection portion 62; when the first bridging plate 6 is connected with two adjacent electric core groups, the first connecting part 61 is connected with the negative pole connecting piece in one electric core group, and the second connecting part 62 is connected with the positive pole connecting piece in the other electric core group. The longitudinal projection of the first bridging plate 6 is rectangular. The first bridging plate 6 is simple in structure, convenient to assemble and low in production cost, the arrangement of the first flexible connecting part 63 ensures that the reliability of connection between the electric core groups is not influenced by vibration, and the reliability of the invention is greatly improved. The first bridging plate 6 is made of a hot-press welding soft busbar, and is convenient to process and low in production cost.
Referring to fig. 1, 2, 6 and 9, according to the above-described embodiment of the present invention, the second bridge plate 7 includes a third connection portion 71, a fourth connection portion 72, and a second flexible connection portion 73 connecting the third connection portion 71 and the fourth connection portion 72; when the second bridge plate 7 connects two adjacent cell rows, the third connection portion 71 is connected to the negative electrode tab at the end of one cell row, and the fourth connection portion 72 is connected to the positive electrode tab at the end of the other cell row. The second bridging plate 7 is simple in structure, convenient to assemble and low in production cost, and the arrangement of the second flexible connecting portion 73 ensures that the reliability of connection between the battery cell rows is not influenced by vibration, so that the reliability of the invention is greatly improved.
Referring to fig. 1, 2, 6 and 9, according to the above embodiment of the present invention, the second bridge plate 7 includes a first thermocompression bonding soft bus bar, one end of the first thermocompression bonding soft bus bar is turned up and folded to form the third connection portion 71, the other end of the first thermocompression bonding soft bus bar is turned up and folded to form the fourth connection portion 72, the middle of the first thermocompression bonding soft bus bar is the second flexible connection portion 73, and the third connection portion 71 and the fourth connection portion 72 are both perpendicular to the second flexible connection portion 73; the third connecting portion 71 and the fourth connecting portion 72 are located on the same plane, and the plane where the third connecting portion 71 and the fourth connecting portion 72 are located is parallel to the plane where the second flexible connecting portion 73 is located. The first hot-press welding soft busbar is rectangular, and the second bridging plate 7 is made of the first hot-press welding soft busbar, so that the processing is convenient, and the production cost is low.
Referring to fig. 1, 2, 7 and 10, according to the above-described embodiment of the present invention, the third bridge plate 8 includes a fifth connection portion 81, a sixth connection portion 82, and a third flexible connection portion 83 connecting the fifth connection portion 81 and the sixth connection portion 82; when the third bridge plate 8 is connected to two adjacent battery cell layers, the fifth connection portion 81 is connected to the negative electrode tab at the corner of one battery cell layer, and the sixth connection portion 82 is connected to the positive electrode tab at the corner of the other battery cell layer. The third bridging plate 8 is simple in structure, convenient to assemble and low in production cost, and the arrangement of the third flexible connecting portion 83 ensures that the connection reliability between the cell layers is not influenced by vibration, so that the reliability of the invention is greatly improved.
Referring to fig. 1, 2, 7 and 10, according to the above embodiment of the present invention, the third bridge plate 8 includes a second thermocompression bonding soft bus bar, two ends of the second thermocompression bonding soft bus bar are respectively bent toward the same side to form the fifth connection portion 81 and the sixth connection portion 82, the middle of the second thermocompression bonding soft bus bar is the third flexible connection portion 83, and the fifth connection portion 81 and the sixth connection portion 82 are both perpendicular to the third flexible connection portion 83; the plane of the fifth connecting portion 81 is parallel to the plane of the sixth connecting portion 82, and the planes of the fifth connecting portion 81 and the sixth connecting portion 82 are both perpendicular to the plane of the third flexible connecting portion 83. The second thermocompression bonding soft busbar is rectangular, and the third bridging plate 8 is made of the first thermocompression bonding soft busbar, so that the processing is convenient, and the production cost is low.
Referring to fig. 1 to 10, according to the above embodiment of the present invention, the positive electrode tab, the negative electrode tab, the first bridging plate 6, the second bridging plate 7 and the third bridging plate 8 are all flow guide members. Anodal utmost point post with all be equipped with the screw hole on the negative pole utmost point post, anodal splicing the negative pole splicing first bridging plate 6 second bridging plate 7 with third bridging plate 8 all through screw 9 with anodal utmost point post with the negative pole utmost point post is connected. The positive pole connecting piece, the negative pole connecting piece, the first bridging plate 6, the second bridging plate 7 and the third bridging plate 8 are all provided with screw top through holes 91, when one positive pole column or negative pole column is connected with the plurality of flow guide components, a screw 9 can also be adopted to sequentially penetrate through the screw top through holes 91 on the flow guide components to be connected and then be matched with threaded holes on the positive pole column or the negative pole column, compared with a welding mode, the connecting mode greatly improves the assembling efficiency of the invention, improves the reliability of series-parallel connection among the battery cores 10 and reduces the production cost.
Referring to fig. 5 to 10, according to the above embodiment of the present invention, the first flexible connecting portion 63, the second flexible connecting portion 73 and the third flexible connecting portion 83 are provided with an insulating protective sheath. The insulating protective sleeve is a heat shrinkable tube. The first flexible connecting portion 63, the second flexible connecting portion 73 and the third flexible connecting portion 83 are arranged on the insulating protective sleeve, and meanwhile, an operator can assemble the insulating protective sleeve conveniently.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010055781.XA CN111162219A (en) | 2020-01-17 | 2020-01-17 | Battery PACK of electricity core monomer cluster and parallel combination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010055781.XA CN111162219A (en) | 2020-01-17 | 2020-01-17 | Battery PACK of electricity core monomer cluster and parallel combination |
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| Publication Number | Publication Date |
|---|---|
| CN111162219A true CN111162219A (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010055781.XA Pending CN111162219A (en) | 2020-01-17 | 2020-01-17 | Battery PACK of electricity core monomer cluster and parallel combination |
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| JP2019149235A (en) * | 2018-02-26 | 2019-09-05 | トヨタ自動車株式会社 | Power supply apparatus |
| JP2019186001A (en) * | 2018-04-09 | 2019-10-24 | 矢崎総業株式会社 | Bus bar module, battery module, battery pack, and battery cell connection method |
| CN211350749U (en) * | 2020-01-17 | 2020-08-25 | 北斗航天汽车（北京）有限公司 | Battery PACK of electricity core monomer cluster and parallel combination |
-
2020
- 2020-01-17 CN CN202010055781.XA patent/CN111162219A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004119187A (en) * | 2002-09-26 | 2004-04-15 | Auto Network Gijutsu Kenkyusho:Kk | Battery configuration method |
| CN102257655A (en) * | 2010-01-28 | 2011-11-23 | 松下电器产业株式会社 | Cell module |
| CN102255064A (en) * | 2010-05-20 | 2011-11-23 | Sb锂摩托有限公司 | Battery pack |
| JP2013037861A (en) * | 2011-08-05 | 2013-02-21 | Toshiba Corp | Secondary battery device and manufacturing method of the same |
| JP2019149235A (en) * | 2018-02-26 | 2019-09-05 | トヨタ自動車株式会社 | Power supply apparatus |
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