CN209981419U - Battery module - Google Patents
Battery module Download PDFInfo
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- CN209981419U CN209981419U CN201920993058.9U CN201920993058U CN209981419U CN 209981419 U CN209981419 U CN 209981419U CN 201920993058 U CN201920993058 U CN 201920993058U CN 209981419 U CN209981419 U CN 209981419U
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- Prior art keywords
- voltage detection
- battery cells
- battery module
- detection unit
- battery
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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
Abstract
The utility model provides a battery module can prevent easily that path resistance from producing the inequality in every connecting path, path resistance is the path resistance of a plurality of connecting paths of being connected a plurality of range upon range of battery unit's electrode terminal and voltage detection portion electricity. A battery module (1) is provided with: a plurality of stacked battery cells (2); and a voltage detection unit (5) that is disposed on the outer surface of the plurality of stacked battery cells (2) and is connected to the electrode terminals (21, 22) of the battery cells (2) to detect the voltage of the battery cells (2), wherein the connection path between the electrode terminals (21, 22) of some of the battery cells (2) and the voltage detection unit (5) includes a connection circuit (6) having a fixed pattern, and the electrode terminals (21, 22) of all of the battery cells (2) are electrically connected to the voltage detection unit (5) using the connection circuit (6) having the same pattern.
Description
Technical Field
The utility model relates to a battery module (battery module) that has a plurality of battery cell (cell) of range upon range of.
Background
A hybrid car (hybrid car) or an electric car is equipped with a battery module in which a plurality of battery cells such as lithium ion (lithium ion) secondary batteries are stacked. Conventionally, as such a battery module, it has been known that a voltage detection unit detects a voltage of a battery cell and monitors a remaining capacity of the battery cell to control charging and discharging of the battery cell (for example, see patent document 1).
[ Prior art documents ]
[ patent document ]
Patent document 1: japanese patent laid-open publication No. 2010-137807
SUMMERY OF THE UTILITY MODEL
[ problem to be solved by the utility model ]
The voltage detection unit includes a plurality of electronic components, and is configured as a housing that accommodates the electronic components in one housing. Generally, such a voltage detection part is electrically connected to an electrode terminal of a battery cell by a wire harness. In this case, if there are an electrode terminal of a battery cell close to the voltage detection unit and an electrode terminal of a battery cell far away from the voltage detection unit, the lengths of connection paths (harnesses) electrically connecting the electrode terminals and the voltage detection unit are different depending on the distance between the electrode terminals and the voltage detection unit, and there is a problem that path resistance unevenness occurs in each connection path. If the path resistance is not uniform, an error may occur in the detection value, and the detection accuracy may be lowered. Further, since it is necessary to prepare a plurality of types of harnesses having different lengths when constructing the battery module, there is a problem that the number of parts to be managed is large, which increases the cost.
Therefore, an object of the present invention is to provide a battery module capable of preventing occurrence of unevenness in each connection path due to path resistance of a plurality of connection paths for electrically connecting electrode terminals of a plurality of stacked battery cells to a voltage detection unit, and capable of reducing cost.
[ means for solving problems ]
(1) The battery module (for example, the battery module described later) of the present invention includes: a plurality of stacked battery cells (for example, battery cells described later); and a voltage detection unit (for example, a voltage detection unit described later) disposed on an outer side surface of the plurality of stacked battery cells and connected to electrode terminals (for example, a positive electrode terminal and a negative electrode terminal described later) of the battery cells to detect voltages of the battery cells, wherein a connection path between the electrode terminals of some of the battery cells and the voltage detection unit includes a connection circuit (for example, a connection circuit described later) having a fixed pattern, and the electrode terminals of all of the battery cells are electrically connected to the voltage detection unit using the connection circuit having the same pattern.
According to the battery module described in the above (1), since all the electrode terminals of the plurality of stacked battery cells and the voltage detection unit are electrically connected by the connection circuit having the same pattern, it is possible to easily prevent the occurrence of variation in path resistance in each connection path. Further, since the plurality of connection circuits are shared by the same pattern, the number of components to be managed can be reduced, and cost reduction can be achieved.
(2) In the battery module according to (1), it is preferable that the voltage detection unit has a flat shape extending over the entire battery cell in the stacking direction.
According to the battery module described in the above (2), since the amount of protrusion of the voltage detection unit from the outer side surface of the plurality of stacked battery cells is suppressed, the height dimension of the battery module is suppressed, and the connection path between the electrode terminal of each battery cell and the voltage detection unit can be shared by the shortest path.
(3) In the battery module according to (1) or (2), it is preferable that the battery cells are stacked in a plurality with terminal surfaces (for example, terminal surfaces described later) having the electrode terminals arranged on the same plane, the voltage detection unit is arranged between a pair of the positive and negative electrode terminals of each battery cell on the terminal surfaces, and the connection circuit is provided across a side surface (for example, a side surface described later) of the voltage detection unit that faces the electrode terminals and the electrode terminals.
According to the battery module described in the above (3), since the connection circuit is disposed from the side surface of the voltage detection unit toward each electrode terminal, the connection circuit does not protrude upward from the voltage detection unit, and the height of the battery module does not increase due to the connection of the connection circuit to the voltage detection unit.
(4) In the battery module according to (1) or (2), the connection circuit preferably includes a bus bar portion (for example, a bus bar portion described later) that electrically connects the electrode terminals of the adjacent battery cells to each other, and a connection portion (for example, a connection portion described later) that electrically connects the bus bar portion and the voltage detection portion, and at least the connection portion of the bus bar portion and the connection portion is preferably formed using a flexible printed board (for example, a flexible printed board described later).
(5) In the battery module according to (3), it is preferable that the connection circuit includes a bus bar portion (for example, a bus bar portion described later) that electrically connects the electrode terminals of the adjacent battery cells to each other, and a connection portion (for example, a connection portion described later) that electrically connects the bus bar portion and the voltage detection portion, and at least the connection portion of the bus bar portion and the connection portion is formed using a flexible printed board (for example, a flexible printed board described later).
According to the battery modules described in (4) and (5), since the connecting portion of each connecting circuit can be made as thin as possible and can be easily bent and deformed, the connecting portion does not affect the height dimension of the battery module. In addition, since the flexible printed circuit board is lightweight, the battery module can also be lightweight.
(6) In the battery module according to (4), the connection portion is preferably detachably and electrically connected to the voltage detection portion via a connector (e.g., a connector described later).
(7) In the battery module according to (5), it is preferable that the connection portion is detachably electrically connected to the voltage detection portion via a connector (for example, a connector described later).
According to the battery modules described in the above (6) and (7), the connection circuits and the voltage detection unit can be easily connected without relying on welding or the like, and the battery modules are excellent in assembly workability. Further, the connection between each connection circuit and the voltage detection unit can be easily released as necessary.
[ effects of the utility model ]
According to the present invention, it is possible to provide a battery module in which unevenness in the path resistance of a plurality of connection paths that electrically connect the electrode terminals of a plurality of stacked battery cells to the voltage detection unit can be prevented from occurring in each connection path, and reduction in cost can be achieved.
Drawings
Fig. 1 is an overall perspective view of the battery module of the present invention.
Fig. 2 is an exploded perspective view of the battery module of the present invention.
Fig. 3 is a plan view of the battery module of the present invention.
Fig. 4 is a perspective view showing one connection circuit of the battery module according to the present invention.
Fig. 5 is a side view of the battery module of the present invention.
Description of the symbols
1: battery module
2: battery unit
2 a: terminal surface
21: positive terminal (electrode terminal)
22: negative terminal (electrode terminal)
5: voltage detection unit
5 a: side surface (of voltage detection unit)
6: connection circuit
61: bus bar part
62: connecting part
621: flexible printed circuit board
622: connector with a locking member
Detailed Description
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
Fig. 1 is an overall perspective view of the battery module of the present invention. Fig. 2 is an exploded perspective view of the battery module of the present invention. Fig. 3 is a plan view of the battery module of the present invention.
The battery module 1 is configured by integrally fastening a plurality of stacked battery cells 2 together with a pair of end plates 3 by a fastening member 4. In addition, among the directions shown in the drawing, the D1 direction is a direction along the stacking direction of the plurality of battery cells 2, and indicates the longitudinal direction of the battery module 1. The direction D2 is a direction orthogonal to the stacking direction of the plurality of battery cells 2, and indicates the width direction of the battery module 1. The direction D3 is a direction orthogonal to the stacking direction of the plurality of battery cells 2, and indicates the height direction (vertical direction) of the battery module 1. In the direction D3, the upper side of the paper surface is "upper" and the lower side is "lower".
The battery cell 2 includes, for example, a lithium ion secondary battery, and an electrode body (not shown) is housed inside a cell case 20 having a rectangular parallelepiped shape made of aluminum, an aluminum alloy, or the like. The upper surface of the battery cell 2 is covered with a terminal surface 2a on which a pair of electrode terminals, i.e., a positive electrode terminal 21 and a negative electrode terminal 22, are protrudingly disposed.
The battery cell 2 is formed in a box shape having a thickness along the direction D1 sufficiently smaller than a width along the direction D2. As shown in fig. 2, the plurality of battery cells 2 are stacked in the thickness direction with their respective terminal surfaces 2a facing upward so that the terminal surfaces 2a are flush with each other. The adjacent battery cells 2, 2 are arranged such that the positive electrode terminals 21 and the negative electrode terminals 22 are alternately aligned when viewed in the stacking direction. The adjacent battery cells 2, 2 are insulated from each other by sandwiching an insulating plate material 23 called a spacer, and are held at a fixed interval.
The end plates 3 are formed of metal, resin, or a composite thereof, and are disposed at both ends of the plurality of stacked battery cells 2 in the stacking direction. The end plate 3 includes a rectangular plate-like member similar to the side surface 2b facing in the stacking direction of the battery cells 2. All the battery cells 2 are disposed so as to be sandwiched between a pair of end plates 3, and are integrally fastened by a pair of fastening members 4, 4. As shown in fig. 2, the insulating plate material 23 is also interposed between the battery cells 2 disposed at both ends in the stacking direction and the end plates 3.
The fastening member 4 is a connecting band made of metal that binds the entirety of the plurality of stacked battery cells 2 and the pair of end plates 3, and is formed long along the stacking direction of the battery cells 2. The pair of fastening members 4, 4 are arranged so as to sandwich the entire plurality of stacked battery cells 2 and the pair of end plates 3, 3 from both sides. Fixing pieces 41, 41 bent at right angles toward the inside (the battery cell 2 side) are provided at both ends of each fastening member 4, 4 in the longitudinal direction (direction D1). The fastening member 4 is fixed to the outer surface 3a of the end plate 3 by the fixing pieces 41 and 41 using an appropriate number of fixing members 42 such as bolts (bolts). As a result, a binding force is applied to all the battery cells 2 in the stacking direction between the end plates 3, 3 by the pair of fastening members 4, and expansion due to charging and discharging of the battery cells 2 is suppressed.
In the battery module 1, the voltage detection unit 5 is disposed on the outer surface of the plurality of stacked battery cells 2. The voltage detection unit 5 is a voltage detection circuit including a plurality of electronic components, not shown, housed in a rectangular parallelepiped housing 50. The voltage detection unit 5 detects the voltage of each battery cell 2 via the plurality of connection circuits 6, and outputs the detection result to the outside of the battery module 1 via a signal line, not shown.
The voltage detection unit 5 shown in the present embodiment is disposed on the upper surface 1a of the battery module 1 including the terminal surface 2a of each battery cell 2. Specifically, the voltage detection unit 5 is disposed between the positive electrode terminal 21 and the negative electrode terminal 22 on each terminal surface 2a on the upper surface 1a of the battery module 1. Therefore, the voltage detection unit 5 can be disposed close to the positive electrode terminal 21 and the negative electrode terminal 22 in the planar direction (the direction parallel to the upper surface 1a of the battery module 1) without affecting the protrusion heights of the positive electrode terminal 21 and the negative electrode terminal 22. Since the voltage detection unit 5 is disposed in contact with or in proximity to the terminal surface 2a of each battery cell 2, the height of the battery module 1 can be reduced as compared with a case where the voltage detection unit 5 is placed above the positive electrode terminal 21 and the negative electrode terminal 22, for example.
As shown in fig. 1 and 3, the voltage detection unit 5 of the present embodiment extends over the entire battery cells 2 in the stacking direction. The voltage detection unit 5 is formed to be long in the planar direction at a higher angle (direction D3) by disposing the electronic components inside the housing 50 in a dispersed manner in the planar direction, specifically, the planar direction is the stacking direction of the battery cells 2. Therefore, the voltage detector 5 has a flat shape in which the height (thickness) along the direction D3 is sufficiently smaller than the width along the direction D2. Thus, even if the voltage detection unit 5 is disposed on the upper surface 1a of the battery module 1, the amount of protrusion of the voltage detection unit 5 from the upper surface 1a can be suppressed, and therefore, as shown in fig. 5, the height dimension H of the battery module 1 is also suppressed. The voltage detection unit 5 is fixed to the upper end surfaces 3b and 3b of the end plates 3 and 3 by fixing members 52 such as screws by means of mounting portions 51 and 51 integrally provided at both ends in the longitudinal direction.
As shown in fig. 3, the width of the voltage detection unit 5 is sufficiently smaller than the separation distance between the pair of electrode terminals (the positive electrode terminal 21 and the negative electrode terminal 22) protruding from the terminal surface 2a of the battery cell 2. Thus, a constant distance L is provided between the voltage detection unit 5 and the positive electrode terminal 21 and the negative electrode terminal 22 of each battery cell 2. In the voltage detection unit 5, the two side surfaces 5a and 5a facing in the direction D2 are arranged so as to face the rows of the positive electrode terminal 21 and the negative electrode terminal 22 arranged along the stacking direction of the battery cells 2. Since the voltage detection unit 5 extends over the entire stack of the battery cells 2 in the stacking direction, the distances L between the positive electrode terminals 21 and the negative electrode terminals 22 and the side surfaces 5a and 5a of the voltage detection unit 5 are uniform for all the positive electrode terminals 21 and the negative electrode terminals 22.
The voltage detection unit 5 is electrically connected to the positive electrode terminal 21 and the negative electrode terminal 22 of each battery cell 2 through a plurality of connection circuits 6 having the same pattern on both side surfaces 5a and 5 a. The connection circuit 6 constitutes a connection path between the positive electrode terminal 21 and the negative electrode terminal 22 of each battery cell 2 and the voltage detection unit 5. Since the distances L between the positive electrode terminals 21 and the negative electrode terminals 22 and the side surfaces 5a and 5a of the voltage detection unit 5 are uniform for all the positive electrode terminals 21 and the negative electrode terminals 22, the connection paths can be shared by the shortest paths.
An example of the configuration of the connection circuit 6 will be described in further detail with reference to fig. 4. The connection circuit 6 has a bus bar portion 61 and a connection portion 62. The bus bar portion 61 electrically connects two electrode terminals, i.e., the positive electrode terminal 21 and the negative electrode terminal 22, which are adjacent to each other in the stacking direction. The connection portion 62 electrically connects the bus bar portion 61 and the voltage detection portion 5. The connection circuit 6 is patterned into a circuit by the bus bar portions 61 and the connection portions 62, and a plurality of connection circuits 6 having the same pattern (the same structure and the same shape) are applied to the electrical connection between the positive electrode terminal 21 and the negative electrode terminal 22 of the other adjacent battery cells 2 and the voltage detection portion 5, respectively. Therefore, all the connection circuits 6 in the battery module 1 are shared in one pattern, and therefore, the path resistance does not vary among the connection circuits 6. In addition, since the plurality of connection circuits 6 are shared, the number of parts to be managed can be reduced, and the cost of the battery module 1 can be reduced.
The bus bar portion 61 shown in the present embodiment includes a thin metal plate having a rectangular flat plate shape. The bus bar portion 61 has two through holes 611 and 611 through which the electrode terminals pass. The bus bar portion 61 is fixed by inserting and fitting the positive electrode terminal 21 and the negative electrode terminal 22 into the through holes 611 and 611, respectively, and screwing a nut (nut), not shown, to the positive electrode terminal 21 and the negative electrode terminal 22. Thus, the bus bar portion 61 is fixed across the positive electrode terminal 21 and the negative electrode terminal 22, and electrically connects the positive electrode terminal 21 and the negative electrode terminal 22.
The bus bar portion 61 of the connection circuit 6 shown in the present embodiment is formed by shifting the positive electrode terminal 21 and the negative electrode terminal 22 fitted in the two through holes 611 and 611 one by one on both sides of the voltage detection unit 5. Therefore, the bus bar portion 61 of each connection circuit 6 connects all the battery cells 2 in series by electrically connecting all the adjacent positive electrode terminals 21 and negative electrode terminals 22, except for one of the pair of electrode terminals (in the present embodiment, the positive electrode terminal 21A of the battery cell 2 at one end and the negative electrode terminal 22A of the battery cell 2 at the other end) of the two battery cells 2, 2 disposed at both ends. However, in the battery module 1, all the battery cells 2 may be connected in parallel by the bus bar portion 61 by arranging and laminating the positive electrode terminals 21 and the negative electrode terminals 22 of the adjacent battery cells 2 and 2 on the same side.
The connection portion 62 shown in this embodiment includes a flexible printed circuit board 621 (hereinafter referred to as an fpc (flexible printed circuit)621) and a connector 622. The FPC621 is configured by laminating an insulating layer 621B on both surfaces of a metal thin film layer 621A formed in a band shape. On one surface of the one end portion 621A of the FPC621, the metal thin film layer 621A is exposed by removing a part of the insulating layer 621B. The FPC621 has the exposed metal thin film layer 621A of the one end portion 621A in contact with the surface of the bus bar portion 61, and is joined to the bus bar portion 61 by a fixing member (none of them are shown) such as a conductive adhesive, solder, or screw.
The connector 622 is provided at the other end 621b of the FPC 621. The connector 622 is fitted to the connector mounting portion 53 provided at a distance in the stacking direction on the side surface 5a of the voltage detection portion 5, thereby electrically connecting the FPC621 (metal thin film layer 621A) to the voltage detection portion 5 in a detachable manner. The battery module 1 shown in the present embodiment has six connector mounting portions 53 on one side surface 5a of the voltage detection portion 5, and five connector mounting portions 53 on the other side surface 5 a. Therefore, as shown in fig. 3, the battery module 1 is provided with eleven connecting circuits 6 corresponding to the connector mounting portions 53 so as to protrude laterally (in the direction D2).
Since all the connection circuits 6 are connected by the side surface 5a of the voltage detection unit 5, they do not protrude upward from the voltage detection unit 5. Therefore, as shown in fig. 5, the height dimension H of the battery module is not increased by connecting the connection circuit 6 to the voltage detection unit 5. Since the connection circuits 6 are connected to the voltage detection unit 5 by the connectors 622, the connection circuits 6 and the voltage detection unit 5 can be easily connected without using solder, screws, or the like, and thus the assembly workability of the battery module 1 is excellent. In addition, the connection between each connection circuit 6 and the voltage detection unit 5 can be easily released during maintenance of the battery module 1, replacement of parts, or the like.
Further, since the connection portion 62 of each connection circuit 6 is configured to include the FPC621, the connection portion 62 can be made as thin as possible and the connection portion 62 can be configured to be easily deformed by bending, as compared with a case where a normal wiring having a circular cross-sectional shape is used. Therefore, there is no concern that the connecting portion 62 affects the height H of the battery module 1. Moreover, since the FPC621 is lightweight, the battery module 1 can be reduced in weight.
The bus bar portion 61 of the connection circuit 6 is not limited to a metal plate, and may include a wire (wire), for example. In the connection circuit 6, the bus bar portion 61 may be formed of an FPC integrated with the connection portion 62. Since the entire connection circuit 6 except for the connector 622 can be FPC-printed, the connection circuit 6 can be simplified, the component cost can be reduced, and the battery module 1 can be further reduced in weight. The connection portion 62 of the connection circuit 6 is not limited to one detachably connected by the connector 622, and may be connected to the voltage detection portion 5 in a non-detachable manner.
Claims (7)
1. A battery module, comprising: a plurality of stacked battery cells; and a voltage detection unit disposed on an outer surface of the plurality of stacked battery cells and connected to electrode terminals of the battery cells to detect voltages of the battery cells, wherein the battery module is characterized in that,
a connection path of a part of the electrode terminals of the battery cells to the voltage detection part includes a connection circuit having a fixed pattern,
the electrode terminals of all the battery cells are electrically connected to the voltage detection unit using the connection circuit of the same pattern.
2. The battery module according to claim 1,
the voltage detection unit has a flat shape extending over the entire battery cell in the stacking direction.
3. The battery module according to claim 1 or 2,
a plurality of the battery cells are stacked with the terminal surfaces having the electrode terminals disposed on the same plane,
the voltage detection unit is disposed between the pair of electrode terminals of each of the battery cells on the terminal surface,
the connection circuit is provided across the electrode terminal and a side surface of the voltage detection unit that faces the electrode terminal.
4. The battery module according to claim 1 or 2,
the connection circuit includes bus bar portions electrically connecting the electrode terminals of the adjacent battery cells to each other, and a connection portion electrically connecting the bus bar portions and the voltage detection portion,
at least the connecting portion of the bus bar portion and the connecting portion is formed using a flexible printed circuit board.
5. The battery module according to claim 3,
the connection circuit includes bus bar portions electrically connecting the electrode terminals of the adjacent battery cells to each other, and a connection portion electrically connecting the bus bar portions and the voltage detection portion,
at least the connecting portion of the bus bar portion and the connecting portion is formed using a flexible printed circuit board.
6. The battery module according to claim 4,
the connection portion is detachably electrically connected to the voltage detection portion via a connector.
7. The battery module according to claim 5,
the connection portion is detachably electrically connected to the voltage detection portion via a connector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-125956 | 2018-07-02 | ||
| JP2018125956A JP7229681B2 (en) | 2018-07-02 | 2018-07-02 | battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209981419U true CN209981419U (en) | 2020-01-21 |
Family
ID=69100429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920993058.9U Active CN209981419U (en) | 2018-07-02 | 2019-06-28 | Battery module |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7229681B2 (en) |
| CN (1) | CN209981419U (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6012595B2 (en) | 2011-03-29 | 2016-10-25 | 三洋電機株式会社 | Battery module, battery system, electric vehicle, moving object, power storage device, power supply device, and electric device |
| JP5673484B2 (en) | 2011-10-26 | 2015-02-18 | 株式会社オートネットワーク技術研究所 | Connection structure between connecting member and electric wire and battery module |
| US9198292B2 (en) | 2012-05-08 | 2015-11-24 | Samsung Sdi Co., Ltd. | Battery pack including circuit board assembly having first circuit board connected to terminals and second circuit board connected to first circuit board |
| JP5786891B2 (en) | 2013-05-09 | 2015-09-30 | トヨタ自動車株式会社 | Power storage device and substrate |
| JP2015159024A (en) | 2014-02-24 | 2015-09-03 | 愛三工業株式会社 | bus bar module |
| WO2015159524A1 (en) | 2014-04-17 | 2015-10-22 | パナソニックＩｐマネジメント株式会社 | Bus bar module, battery monitoring module, and battery module |
| JP6359362B2 (en) | 2014-07-07 | 2018-07-18 | 株式会社東芝 | Battery module |
| JP2018006276A (en) | 2016-07-07 | 2018-01-11 | カルソニックカンセイ株式会社 | Battery pack and power supply device |
| JP2019079726A (en) | 2017-10-25 | 2019-05-23 | 株式会社ケーヒン | Voltage detection device |
-
2018
- 2018-07-02 JP JP2018125956A patent/JP7229681B2/en active Active
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2019
- 2019-06-28 CN CN201920993058.9U patent/CN209981419U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP7229681B2 (en) | 2023-02-28 |
| JP2020004681A (en) | 2020-01-09 |
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