CN111312974B - Energy storage system with two different battery modules - Google Patents
Energy storage system with two different battery modules Download PDFInfo
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- CN111312974B CN111312974B CN201811509667.9A CN201811509667A CN111312974B CN 111312974 B CN111312974 B CN 111312974B CN 201811509667 A CN201811509667 A CN 201811509667A CN 111312974 B CN111312974 B CN 111312974B
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- 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
- H01M50/531—Electrode connections inside a battery casing
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- 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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- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides an energy storage system with two different battery modules, which comprises a first battery module and a second battery module. The first battery module includes: a first housing; a plurality of first battery cells are arranged in the first shell; and a plurality of first conductive sheets disposed at both ends of the first battery cell and used to connect the first battery cells in series or in parallel. The second battery module includes: a second housing; a plurality of second battery cells are arranged in the second shell; and a plurality of second conductive sheets disposed at both ends of the second battery cell and used to connect the second battery cells in series or in parallel. Moreover, the length and the width of the current path of the first conductive sheet are different from those of the current path of the second conductive sheet. The invention can enable the overall impedance of the first battery module and the second battery module to be mutually matched through the difference of the structures of the conducting strips, and can avoid increasing the arrangement of power elements and extra cost.
Description
Technical Field
The present invention relates to an energy storage system, and more particularly, to an energy storage system having two different battery modules.
Background
Fig. 1 shows a perspective view of a conventional servo energy storage cabinet. As shown in fig. 1, the conventional servo energy storage cabinet 100 includes a housing 110 and a plurality of battery modules 120. The battery modules 120 are disposed in the housing 110 and electrically connected to each other. As the demand of the system for high power increases, the number of the battery modules 120 carried by the battery system of the servo energy storage cabinet 100 increases, and thus the requirement for the impedance uniformity design of the battery modules 120 is more stringent. To overcome the above problems, the overall impedance of the battery module 120 is conventionally adjusted by adding power devices.
Fig. 2 shows an exploded view of a conventional battery module. As shown in fig. 2, the battery module 120 includes a plurality of cylindrical battery cells 121, at least one cell holder 123, and a plurality of conductive sheets 124. The bracket 123 defines a plurality of battery receiving spaces for placing and fixing the battery cells 121, and the battery cells 121 are stacked in the longitudinal direction x and the width direction z of the bracket 123, respectively. The conductive sheets 124 are respectively disposed at two ends of the battery cells 121, so that the battery cells 121 are connected in parallel or in series to form a plurality of battery cell arrays. The conductive sheet 124 is soldered to each battery cell 121, so as to achieve the series and parallel functions. The battery module 120 further includes a circuit board 126. The circuit board 126 may be a BMS control board. The at least one support 123 further defines an accommodating space for accommodating the circuit board 126. The conductive plates 124 of the final positive or negative electrode at both ends of the battery module 120 are locked to the circuit board 126 by screws 125, and the circuit board 126 is also locked to the bracket 123 by the screws 125. A plurality of electrical connectors are provided on the circuit board 126.
Fig. 3 shows a top view of a conventional conductive sheet. As shown in fig. 3, in order to electrically and smoothly electrically connect the conductive sheet 124 to the battery cell 120, a slot 140 is formed at a position of the conductive sheet 124 corresponding to the electrode of the battery cell 120. The slot 140 separates the two electrical pads 142 so that current can bypass the slot 140 and travel a greater distance, thereby increasing the temperature of the electrical pads 142. So design, can strengthen the fixed effect of electric welding, avoid conducting strip 120 to remove or rock.
Fig. 4 shows a circuit diagram of a conventional servo energy storage cabinet. As shown in fig. 4, the battery modules 120 of the servo energy storage cabinet 100 are connected in parallel with each other. When the overall impedances of the battery modules 120 are different, the current flows to the battery module 120 having a small impedance, so that the single battery module 120 is damaged due to the excessive current. Conventionally, the battery module 120 further includes a power element 127 disposed on the circuit board 126 to adjust the overall impedance of the battery module 120, so that the overall impedances of the battery modules 120 of the servo energy storage cabinet 100 can be matched with each other.
The conventional method of adjusting the overall impedance of the battery module 120 by adding the power element 127 is to locally generate heat at a single point, that is, only the power element 127 generates heat, so the required volume of the accessory heat dissipation component is very large, and when heat cannot be dissipated, the temperature of the power element 127 is often too high, which causes a safety problem. Therefore, it is worth to discuss how to adjust the overall impedance of the battery module 120, and consider the heat dissipation problem, and simplify the process and reduce the cost without increasing the power device 127.
Disclosure of Invention
It is therefore an objective of an embodiment of the present invention to provide an energy storage system, in which the conductive sheets of two different battery modules have different structures, so that the overall impedances of the two different battery modules are matched with each other.
According to an embodiment of the present invention, an energy storage system includes a first battery module and a second battery module. The first battery module includes: a first housing; a plurality of first battery cells are arranged in the first shell; and a plurality of first conductive sheets disposed at both ends of the first battery cell and used to connect the first battery cells in series or in parallel. The second battery module includes: a second housing; a plurality of second battery cells are arranged in the second shell; and a plurality of second conductive sheets disposed at both ends of the second battery cell and used to connect the second battery cells in series or in parallel. Moreover, the length and the width of the current path of the first conductive sheet are different from those of the current path of the second conductive sheet.
In one embodiment, the impedance of the first battery cell of each of the first battery modules is not matched with the impedance of the second battery cell of each of the second battery modules, and the impedance of each of the first battery modules is matched with the impedance of each of the second battery modules.
In one embodiment, an energy storage system includes a first battery module and a second battery module. The first battery module includes: a first housing; a plurality of first battery cells are arranged in the first shell; and a plurality of first conductive sheets disposed at both ends of the first battery cell and used to connect the first battery cells in series or in parallel. The second battery module includes: a second housing; a plurality of second battery cores are arranged in the second shell; and a plurality of second conductive sheets disposed at both ends of the second battery cell and used to connect the second battery cells in series or in parallel. And each first conductive sheet comprises a first slot, each second conductive sheet comprises a second slot, and the shape of the second slot is different from that of the first slot, so that the width or the length of a current path between the second slot and the edge of the surface of each second conductive sheet is different from that between the first slot and the edge of the surface of the first conductive sheet.
In one embodiment, the impedance of the second battery cell of each second battery module is smaller than the impedance of the first battery cell of each first battery module, and the width of the current path between the second slot and the edge of the surface of the second conductive sheet is smaller than the width of the current path between the first slot and the edge of the surface of the first conductive sheet, so that the impedance of each first battery module is matched with the impedance of each second battery module.
In one embodiment, each of the first conductive sheets and each of the second conductive sheets includes a plurality of electrode ends and a plurality of connecting channel portions, each of the connecting channel portions is connected between two adjacent electrode ends, the first slot is located at each of the electrode ends of each of the first conductive sheets, and the second slot is located at each of the electrode ends of each of the second conductive sheets.
In one embodiment, the second slot comprises a curved slot having an opening. Preferably, the opening portions of the second conductive sheet having the shape of the curved slots of at least two of the electrode end portions of the second conductive sheet face in opposite directions to each other.
In one embodiment, the second slot further comprises a bar slot, and the first slot is another bar slot. In one embodiment, the curved slot has a semicircular shape or a C-shape. In an embodiment, each of the second conductive sheets further includes a plurality of channel slots, and each of the channel slots is located at each of the connecting channel portions.
In one embodiment, the current path of each second conductive sheet is greater than the linear distance of each connecting channel portion of each second conductive sheet, and the current path of each second conductive sheet is greater than the current path of each first conductive sheet.
According to an embodiment of the present invention, in the energy storage system, a length and a width of a current path of the first conductive sheet of the first battery module are different from a length and a width of a current path of the second conductive sheet of the second battery module. In another embodiment, the shape of the second slot is different from the shape of the first slot, so that the width or length of the current path between the second slot and the edge of the surface of the second conductive sheet is different from the width or length of the current path between the first slot and the edge of the surface of the first conductive sheet. By the design, the overall impedance of the first battery module and the overall impedance of the second battery module can be matched with each other through the structure difference of the conducting strips, and no additional cost is required to be added without increasing the power element. In one embodiment, the second conductive sheet with higher impedance is distributed evenly, so that heat is not concentrated locally, and local temperature is too high.
Drawings
Fig. 1 shows a perspective view of a conventional servo energy storage cabinet.
Fig. 2 shows an exploded view of a conventional battery module.
Fig. 3 shows a top view of a conventional conductive sheet.
Fig. 4 shows a circuit diagram of a conventional servo energy storage cabinet.
Fig. 5 is a perspective view of an energy storage system according to an embodiment of the invention.
Fig. 6 is a side view illustrating a battery module according to an embodiment of the present invention.
Fig. 7 shows a top view of the first conductive sheet according to an embodiment of the present invention.
Fig. 8 is a top view of a second conductive sheet according to an embodiment of the invention.
Reference numerals:
100: servo energy storage cabinet
110: outer casing
120: battery module
121: battery core
123: support frame
124: conducting strip
125: quilt screw
126: circuit board
127: power element
140: slotting
142: electric welding spot
200: energy storage system
210: outer cover
220a: first battery module
220b: second battery module
221: the battery core
224a: first conductive sheet
224b: second conductive sheet
228: outer casing
241a: slotting
241b: slotting
243: two electric welding points
245: electrode tip
246: connecting channel part
411: strip-shaped slot
412: curved slotting
461: channel slotting
Detailed Description
Fig. 5 is a perspective view of an energy storage system according to an embodiment of the invention. As shown in fig. 5, according to an embodiment of the present invention, the energy storage system 200 includes a module housing 210, a first battery module 220a, and a second battery module 220b. In this embodiment, the energy storage system 200 may be a servo energy storage cabinet. The first battery module 220a and the second battery module 220b are disposed in the module case 210, and are electrically connected in parallel with each other.
Fig. 6 is a side view illustrating a battery module according to an embodiment of the present invention. As shown in fig. 6, the second battery module 220b includes a housing 228, a plurality of cylindrical battery cells 221, and a plurality of second conductive sheets 224b. The casing 228 is used for accommodating the battery cell 221, and in one embodiment, the battery cell 221 may be supported by a bracket (not shown) and accommodated in the casing 228. The second conductive sheets 224b are respectively disposed at two ends of the battery cells 221 for connecting the battery cells 221 in parallel into a plurality of battery arrays and connecting the battery arrays in series to form a second battery module 220b.
In one embodiment, the bracket is formed with a groove for fixing, and the battery case 228 is fixed by the groove structure of the bracket, the conductive sheets 224a and 224b for spot welding (see fig. 7 and 8 described later) can be placed on the bracket, and the bracket can have positioning pins for positioning through the positioning holes of the conductive sheets 224a and 224b, and then the spot welding process is performed.
The structure of the first battery module 220a is similar to that of the second battery module 220b, and therefore the same reference numerals are used for the same elements, and at least one difference between the two will be described below. The first battery module 220a includes a first conductive sheet 224a, and a structure of a current path of the first conductive sheet 224a is different from a structure of a current path of the second conductive sheet 224b. According to the above features, the overall impedance of the battery module can be adjusted, heat dissipation is considered, and the process is simplified and the cost is reduced without increasing power components. The difference between the two conductive sheets will be described in more detail below.
Fig. 7 shows a top view of the first conductive sheet according to an embodiment of the present invention. As shown in fig. 7, the first conductive sheet 224a includes a plurality of electrode end portions 245 and a plurality of connecting channel portions 246. The connection passage portion 246 is connected between two adjacent electrode end portions 245. Each electrode end 245 includes a slot 241a and two electrical pads 243. The slot 241a and the edge of the surface of the first conductive sheet 224a form at least one current path, and the slot 241a is located between the two electrical pads 243 and separates the two electrical pads 243, so that the electrical current for electrical welding can bypass the slot 241a, in the present embodiment, the slot 241a is long, in an embodiment, I-shaped, so that the width wa of the current path between the slot 241a and the edge of the surface of the first conductive sheet 224a can be as large as possible, thereby reducing the impedance and allowing the working current I to easily pass through. In one embodiment, the maximum width wa is greater than the width W of the connecting channel portion 246. Preferably, the width wa of the majority of the area is greater than the width W of the connecting channel portion 246.
Fig. 8 is a top view of a second conductive sheet according to an embodiment of the invention. As shown in fig. 8, the second conductive sheet 224b includes a plurality of electrode end portions 245 and a plurality of connecting channel portions 246. The connection passage portion 246 is connected between two adjacent electrode end portions 245. Each electrode end 245 includes a slot 241b and two electrical pads 243. The slot 241b and the edge of the surface of the second conductive sheet 224b form at least one current path, and the slot 241b is located between the two electrical pads 243 and separates the two electrical pads 243, so that the current can bypass the slot 241 b. In one embodiment, the width wb of the current path between the slot 241b and the edge of the surface of the second conductive plate 224b is smaller than the width wa of the current path between the slot 241a and the edge of the surface of the first conductive plate 224 a. In one embodiment, the width wb of the majority of the area is less than the width W of the connecting channel portion 246. Preferably, the maximum width wb is less than the width W of the connecting channel portion 246.
The overall impedance of the battery module includes the impedance of a Printed Circuit Board Assembly (PCBA), the impedance of a battery core, the impedance of a conductive sheet, the impedance of a cable (cable), and the impedance of a terminal device. Since the energy storage system 200 requires a plurality of battery cells 221, however, the battery cells 221 may have different impedances due to different processes of different suppliers, and in order to make each impedance of the battery modules of the energy storage system 200 the same, in the prior art, power elements, such as mercury elements, semiconductors, etc., are added on the printed circuit board assembly. But this has the additional cost of high cost, requiring additional circuitry, heat generation, etc. Moreover, when the heat generation is high, an additional heat dissipation module is required, which not only increases the cost, but also requires additional space for the heat dissipation module.
On the contrary, according to the present invention, the length and width of the current path are changed by the second conductive sheets 224b having different shapes to adjust the impedance value of the conductive sheets 224b, thereby achieving the design of uniform impedance of the battery modules 220a and 220b. More specifically, the structure of the slot 241b of the second conductive sheet 224b is changed to change the impedance. For example, when the impedance of the battery cell 221 of the first battery module 220a is 60m Ω; the impedance of the first conductive sheet 224a is 40m Ω; when the impedance of the battery cell 221 of the second battery module 220b is 40m Ω, the impedance of the second conductive sheet 224b can be increased to 60m Ω by designing the shape of the slot of the second conductive sheet 224b, so that the overall impedances of the first battery module 220a and the second battery module 220b are both 100m Ω. By the design, additional elements are not added, and the manufacturing cost can be reduced. In addition, since the overall impedance of the first battery module 220a and the second battery module 220b is 100m Ω, when a short circuit occurs outside the energy storage system 200, the current does not completely feed back to the battery cell 221 having an impedance of 40m Ω, and the second battery module 220b is damaged due to the excess of the current.
In addition, since the first conductive sheet 224a of the first battery module 220a and the second conductive sheet 224b of the second battery module 220b are uniformly disposed at both ends of the battery cell 221, heat generation is uniform, and there is no problem of local over-temperature due to local heat generation. In addition, the conductive sheets 224b are all in direct contact with the battery cell 221, so when the conductive sheets 224b generate heat, the heat can be dissipated to the battery cell 221 without concentrating the heat locally.
As described above, according to an embodiment of the present invention, the length and width of the current traveling path are changed by the conductive sheets of different shapes to adjust the impedance value of the conductive sheets, the increased impedance is distributed to the conductive sheets, and the heat sources are equally distributed to facilitate the conduction to the battery cell 221 or the air for cooling, thereby achieving the design of the impedance uniformity of the battery module, reducing the temperature of the battery module when increasing the impedance, and improving the heat dissipation performance. The method for adjusting the length and width of the current walking path on the conductive sheet can be, but is not limited to, this.
Please refer to fig. 8. The slot 241b includes a curved slot 412. The width wb of the current path between the curved slot 412 and the edge of the surface of the second conductive plate 224b is made smaller than the width wa of the current path between the slot 241a and the edge of the surface of the first conductive plate 224 a. In one embodiment, the slot 241b further includes a bar slot 411, which is I-shaped in one embodiment. Preferably, the strip-shaped slot 411 is connected to the middle portion of the curved slot 412. The stripe-shaped slot 411 is located between and separates the two electrical pads 243, and the two electrical pads 243 are located in the area defined by the curved slot 412 and the stripe-shaped slot 411.
In one embodiment, the curved slot 412 has an opening Oa, such as a semicircular shape or a C-shape, and the curved slot 412 is spaced a predetermined distance from the center of the electrode end 245. The openings Oa and Ob in the shape of the two curved grooves 412 in at least two electrode ends 245 (for example, in the region S) of the electrode ends 245 face in opposite directions. With such a design, the length of the travel path of the current i can be made long. Preferably, the current path of the current i of the second conductive plate 224b is greater than the linear distance of the connecting channel portion 246 of the second conductive plate 224b, and in one embodiment, the current path of the current i of the second conductive plate 224b is preferably greater than the current path of the current i of the first conductive plate 224 a.
As shown in fig. 7, the width of the first conductive sheet 224a of the current traveling path is adjusted according to the current density distribution, so that the width of the conductive sheet at the high current density is wider than the width of the conductive sheet at the low current density, thereby adjusting the impedance value of the first conductive sheet 224a and avoiding the over-temperature caused by the over-high temperature, thereby achieving the optimal design. In addition, as shown in fig. 8, the second conductive sheet 224b is provided with a curved slot, so that the length and width of the path of the current running through the conductive sheet are changed to adjust the impedance value of the conductive sheet.
In one embodiment, the second conductive sheet 224a may further include a plurality of channel slots 461, and each channel slot 461 is located at each connecting channel portion 246, so as to reduce the width W of the connecting channel portion 246.
In summary, according to an embodiment of the invention, in the energy storage system 200, the structure of the current path of the first conductive sheet 224a of the first battery module 220a is different from the structure of the current path of the second conductive sheet 224b of the second battery module 220b. Therefore, the overall impedances of the first battery module 220a and the second battery module 220b can be matched with each other by designing the length and width of the current path of the conductive sheet, and no additional cost is required to be added without increasing the number of power elements. The second conductive sheet 224b having a higher resistance is distributed less evenly so that heat is not concentrated locally and thus local temperature is too high, and the second conductive sheet 224b directly contacts the battery cell 221, so that the entire heat can be further dispersed through the battery cell 221.
Claims (11)
1. An energy storage system, comprising:
a first battery module, comprising: a first housing; a plurality of first battery cells are arranged in the first shell; and a plurality of first conductive sheets provided at both ends of the first battery cell and used to connect the first battery cells in series or in parallel; and
a second battery module, comprising: a second housing; a plurality of second battery cores are arranged in the second shell; and a plurality of second conductive sheets provided at both ends of the second battery cell and connecting the second battery cells in series or in parallel,
wherein the content of the first and second substances,
the impedance of each first battery cell of the first battery module is not matched with the impedance of each second battery cell of the second battery module,
each first conductive sheet includes a first slot, and each second conductive sheet includes a second slot,
the shape of the second slot is different from that of the first slot, so that the length and the width of the current path of each first conducting sheet are different from those of the current path of each second conducting sheet, and the impedance of the first battery module is matched with that of the second battery module.
2. The energy storage system of claim 1,
the impedance of each second battery cell of the second battery module is smaller than that of each first battery cell of the first battery module, and
the width of the current path between the second slot and the edge of the surface of the second conducting plate is smaller than the width of the current path between the first slot and the edge of the surface of the first conducting plate, so that the impedance of the first battery module is matched with the impedance of the second battery module.
3. An energy storage system, comprising:
a first battery module, comprising: a first housing; a plurality of first battery cells are arranged in the first shell; and a plurality of first conductive sheets provided at both ends of the first battery cell and used to connect the first battery cells in series or in parallel; and
a second battery module, comprising: a second housing; a plurality of second battery cells are arranged in the second shell; and a plurality of second conductive sheets provided at both ends of the second battery cell and connecting the second battery cells in series or in parallel,
wherein the content of the first and second substances,
the impedance of each first battery cell of the first battery module is not matched with the impedance of each second battery cell of the second battery module,
each of the first conductive sheets includes a first slot and
each second conductive sheet comprises a second slot, and the shape of the second slot is different from that of the first slot, so that the width or the length of a current path between the second slot and the edge of the surface of each second conductive sheet is different from that between the first slot and the edge of the surface of each first conductive sheet, and the impedance of the first battery module is matched with that of the second battery module.
4. The energy storage system of claim 3,
the impedance of each second battery cell of the second battery module is smaller than that of each first battery cell of the first battery module, and
the width of the current path between the second slot and the edge of the surface of the second conducting plate is smaller than the width of the current path between the first slot and the edge of the surface of the first conducting plate, so that the impedance of the first battery module is matched with the impedance of the second battery module.
5. The energy storage system of claim 4,
each first conductive sheet and each second conductive sheet comprise a plurality of electrode ends and a plurality of connecting channel parts, each connecting channel part is connected between two adjacent electrode ends, and
the first slot is located at each electrode end of each first conducting strip, and the second slot is located at each electrode end of each second conducting strip.
6. The energy storage system of claim 5, wherein the second slot comprises a curvilinear slot having an opening.
7. The energy storage system of claim 6, wherein said two of said curvilinear slot-shaped openings of said electrode ends of each of said second conductive sheets face in opposite directions to each other.
8. The energy storage system of claim 7,
the second slot further comprises a strip slot, and
the first slot is another slot.
9. The energy storage system of any of claims 6-8, wherein the curved slot has a semicircular shape or a C-shaped shape.
10. The energy storage system of any one of claims 6 to 8, wherein each second conductive sheet further comprises a plurality of channel slots, and each channel slot is located at each connecting channel portion.
11. The energy storage system according to any one of claims 6 to 8,
the current path of each second conductive sheet is greater than the linear distance of each connecting channel part of each second conductive sheet, and
the current path of each second conducting plate is larger than that of each first conducting plate.
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| CN201811509667.9A CN111312974B (en) | 2018-12-11 | 2018-12-11 | Energy storage system with two different battery modules |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811509667.9A CN111312974B (en) | 2018-12-11 | 2018-12-11 | Energy storage system with two different battery modules |
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| CN111312974B true CN111312974B (en) | 2023-04-07 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529621A (en) * | 2006-10-23 | 2009-09-09 | 株式会社Lg化学 | Equal distribution-typed connecting member, and middle or large-sized battery pack employed with the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7808131B2 (en) * | 2006-10-12 | 2010-10-05 | Xtreme Power Inc. | Precision battery pack circuits |
| TW201507319A (en) * | 2013-08-05 | 2015-02-16 | Hon Hai Prec Ind Co Ltd | Charge and discharge system |
| JP6351395B2 (en) * | 2014-06-20 | 2018-07-04 | 矢崎総業株式会社 | Busbar module |
| WO2016062250A1 (en) * | 2014-10-23 | 2016-04-28 | Quantum Force Engineering Limited | Battery assembly |
| TWM559515U (en) * | 2017-12-05 | 2018-05-01 | 財團法人工業技術研究院 | Battery bus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529621A (en) * | 2006-10-23 | 2009-09-09 | 株式会社Lg化学 | Equal distribution-typed connecting member, and middle or large-sized battery pack employed with the same |
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