JP2015072874A - Battery holder and battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the possibility that short circuits, etc. of a battery are caused by an electrolyte leaking from the battery in a battery unit using a battery pack.SOLUTION: A battery holder 2 of the invention includes: a negative electrode side holding part 21 which holds the negative electrode side of a battery 10; a positive electrode side holding part 22 which holds the positive electrode side of a battery 10 which is located adjacent to the battery 10; an electrolyte holding part 24 which is provided at the outer side of the positive electrode side holding part 22 and holds an electrolyte; and communication holes 27 which allow the inner side of the positive electrode side holding part 22 to communicate with the electrolyte holding part 24.

Description

  The present invention relates to an assembled battery configured by combining a plurality of batteries, and a battery holder used for the assembled battery.

  A battery unit using an assembled battery in which a plurality of batteries are connected by a holder or the like and the plurality of batteries are connected in series or in parallel is known. As a prior art of such a battery unit, for example, a battery pack including a plurality of core packs (assembled batteries) that store eight battery cells in a parallel posture and a circuit board is known (for example, Patent Document 1). reference).

  By the way, for example, a general battery such as a cylindrical secondary battery is provided with a safety valve on the positive electrode side that opens when the internal pressure increases due to overdischarge or the like and maintains the internal pressure below a certain pressure. When the safety valve is opened, the electrolyte may be discharged to the outside together with the internal gas. This is a phenomenon called so-called liquid leakage. In the battery pack of the related art, when the electrolyte leaked from the battery due to liquid leakage contacts the circuit board, a short circuit or the like occurs in the circuit board due to so-called electrochemical migration, thereby causing a failure or the like. There is a fear.

  As a conventional technique for solving such a problem, an electrolyte receiving part is provided between the battery and the circuit board so that the electrolyte leaked from the battery due to liquid leakage does not contact the circuit board. A battery unit in which an absorbent material is provided in the section is known (see, for example, Patent Document 2).

JP 2012-59373 A JP 2013-69646 A

  However, in the above-described prior art, there is a risk that the electrolyte leaked from any of the plurality of batteries may cause a short circuit in another battery or a short-circuit loop passing through the plurality of batteries may be formed. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the possibility of a short circuit of the battery due to the electrolyte solution leaking from the battery in the battery unit using the assembled battery.

<First Aspect of the Present Invention>
The first aspect of the present invention includes a negative electrode side holding portion that holds the negative electrode side of the first battery, a positive electrode side holding portion that holds the positive electrode side of the second battery adjacent to the first battery, and the positive electrode side holding. The battery holder includes an electrolyte solution holding unit that is provided outside the unit and that holds the electrolyte solution, and a communication hole that communicates the inside of the positive electrode side holding unit and the electrolyte solution holding unit.

  The electrolytic solution leaked from the positive electrode side of the second battery to the inside of the positive electrode side holding portion of the battery holder flows into the electrolytic solution holding portion provided outside the positive electrode side holding portion through the communication hole. Held in. Therefore, the possibility that the electrolyte leaked from the positive electrode side of the second battery flows out to the outside of the battery holder can be reduced. As a result, it is possible to reduce the risk of the battery short circuit or the like due to the electrolyte leaking from the positive electrode side of the second battery.

  Thereby, according to the 1st aspect of this invention, in the battery unit using an assembled battery, the effect that the possibility that the short circuit of a battery, etc. will arise by the electrolyte solution which leaked from the battery can be reduced.

<Second Aspect of the Present Invention>
A second aspect of the present invention is a battery holder according to the first aspect of the present invention described above, wherein the electrolytic solution holding part includes an absorbent material that absorbs and holds the electrolytic solution.
According to the second aspect of the present invention, since the electrolyte leaked from the positive electrode side of the second battery is absorbed and held by the absorbent material, the possibility of the electrolyte flowing out of the battery holder is further reduced. can do.

<Third Aspect of the Present Invention>
According to a third aspect of the present invention, in the first aspect or the second aspect of the present invention described above, an opening is further provided that communicates from the outside to the negative terminal of the first battery and the positive terminal of the second battery. It is a battery holder.
According to the 3rd aspect of this invention, the negative electrode terminal of the 1st battery and the positive electrode terminal of a 2nd battery can be connected in the state which connected the adjacent 1st battery and the 2nd battery with the battery holder. . Thereby, safety and work efficiency can be improved in the work process of manufacturing the assembled battery.

<Fourth aspect of the present invention>
A fourth aspect of the present invention includes a first battery, a second battery adjacent to the first battery, and a battery holder that holds the first battery and the second battery, and the battery holder includes: A negative electrode side holding part that holds the negative electrode side of the first battery, a positive electrode side holding part that holds the positive electrode side of the second battery, and an electrolyte solution that is provided outside the positive electrode side holding part and holds the electrolytic solution An assembled battery including a holding portion and a communication hole that communicates the inside of the positive electrode-side holding portion and the electrolyte solution holding portion.
According to the fourth aspect of the present invention, in the battery unit using this assembled battery, the same operational effects as those of the first aspect of the present invention described above can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, in the battery unit using an assembled battery, a possibility that a short circuit etc. of a battery may arise with the electrolyte solution which leaked from the battery can be reduced.

The perspective view of a cylindrical battery. The perspective view of the assembled battery which concerns on this invention. The perspective view of the assembled battery which concerns on this invention seen from the angle different from FIG. The exploded perspective view of a battery holder. Sectional drawing which illustrated the AA cross section of FIG. The perspective view of the holder main body of a battery holder. The perspective view of the holder main body of the battery holder seen from the angle different from FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, this invention is not specifically limited to the Example demonstrated below, It cannot be overemphasized that a various deformation | transformation is possible within the range of the invention described in the claim.

<Configuration of assembled battery according to the present invention>
The structure of the assembled battery according to the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of the battery 10.
The battery 10 is a cylindrical battery such as a nickel hydride secondary battery, and includes a negative electrode terminal 11 and a positive electrode terminal 12. The battery 10 is provided with a safety valve (not shown) inside the positive electrode that opens when the internal pressure rises due to overdischarge or the like and maintains the internal pressure below a certain pressure. The battery 10 is provided with a gas vent hole 13 in the vicinity of the positive electrode terminal 12 through which the electrolyte is discharged together with the internal gas when the safety valve is opened.

  FIG. 2 is a perspective view of the assembled battery according to the present invention. FIG. 3 is a perspective view of the battery pack according to the present invention viewed from an angle different from that in FIG.

  The assembled battery according to the present invention includes first to eighth batteries 10a to 10h and first to seventh battery holders 2a to 2g.

  The first to eighth batteries 10a to 10h are the battery 10 illustrated in FIG. The 1st-7th battery holders 2a-2g are the battery holders 2 mentioned later. The first battery holder 2a holds the negative electrode side of the first battery 10a and the positive electrode side of the second battery 10b adjacent to the first battery 10a. The second battery holder 2b holds the negative electrode side of the second battery 10b and the positive electrode side of the third battery 10c adjacent to the second battery 10b. The third battery holder 2c holds the negative electrode side of the third battery 10c and the positive electrode side of the fourth battery 10d adjacent to the third battery 10c.

  Similarly, the fourth battery holder 2d holds the negative electrode side of the fourth battery 10d and the positive electrode side of the fifth battery 10e adjacent to the fourth battery 10d. The fifth battery holder 2e holds the negative electrode side of the fifth battery 10e and the positive electrode side of the sixth battery 10f adjacent to the fifth battery 10e. The sixth battery holder 2f holds the negative electrode side of the sixth battery 10f and the positive electrode side of the seventh battery 10g adjacent to the sixth battery 10f. The seventh battery holder 2g holds the negative electrode side of the seventh battery 10g and the positive electrode side of the eighth battery 10h adjacent to the seventh battery 10g.

  The negative terminal of the first battery 10a and the positive terminal of the second battery 10b, the negative terminal of the second battery 10b and the positive terminal of the third battery 10c, the negative terminal of the third battery 10c and the positive terminal of the fourth battery 10d, fourth The negative terminal of the battery 10d and the positive terminal of the fifth battery 10e, the negative terminal of the fifth battery 10e and the positive terminal of the sixth battery 10f, the negative terminal of the sixth battery 10f and the positive terminal of the seventh battery 10g, and the seventh battery 10g The negative electrode terminal and the positive electrode terminal of the eighth battery 10h are connected to each other by seven lead plates 30 described later. That is, the assembled battery includes the first to eighth batteries 10a to 10h connected in series, and the power can be taken out from the positive terminal 12a of the first battery 10a and the negative terminal 11g of the eighth battery 10h.

<Configuration of battery holder 2>
The configuration of the battery holder 2 will be described with reference to FIGS.

FIG. 4 is an exploded perspective view of the battery holder 2. FIG. 5 is a cross-sectional view illustrating the AA cross section of FIG. 2. FIG. 6 is a perspective view of the holder body 20 of the battery holder 2. FIG. 7 is a perspective view of the holder main body 20 of the battery holder 2 viewed from an angle different from that in FIG.
The battery holder 2 includes a holder body 20, a lead plate 30, and an absorbent material 40.

  The holder body 20 includes a negative electrode side holding part 21, a positive electrode side holding part 22, and a base part 23.

  The negative electrode side holding portion 21 has a substantially cylindrical shape and holds the negative electrode side of the battery 10. For example, the above-described assembled battery will be described as an example. The negative electrode side holding portion 21b of the second battery holder 2b holds the negative electrode side of the second battery 10b, and the negative electrode side holding portion 21d of the fourth battery holder 2d The negative electrode side of the battery 10d is held (FIG. 5).

  The positive electrode side holding part 22 has a bottomed substantially cylindrical shape and holds the positive electrode side of the battery 10. For example, the above-described assembled battery will be described as an example. The positive electrode side holding portion 22b of the second battery holder 2b holds the positive electrode side of the third battery 10c, and the positive electrode side holding portion 22d of the fourth battery holder 2d The positive electrode side of the battery 10e is held (FIG. 5). Further, an upper end surface of the positive electrode terminal 12 of the battery 10 is provided on the bottom portion 221 of the positive electrode side holding portion 22 so that the electrolyte leaked inside the positive electrode side holding portion 22 does not leak outside the positive electrode side holding portion 22. A hole 222 exposed to the outside of the positive electrode side holding portion 22 is formed.

  The base portion 23 is a substantially oval plate-like portion, and the negative electrode side holding portion 21 and the positive electrode side holding portion 22 are integrally formed on the front side thereof. An electrolyte solution holding part 24 is formed on the back side of the base 23 that is outside the positive electrode side holding part 22. Furthermore, an opening 28 is formed in the approximate center of the base 23 from the outside to the negative terminal 11 of the battery 10 held by the negative holding part 21 and the positive terminal 12 of the battery 10 held by the positive holding part 22. .

  The electrolyte solution holding part 24 is a recess formed between the substantially rectangular inner peripheral wall part 25 and the substantially oval outer peripheral wall part 26, and communicates with the inside of the positive electrode side holding part 22 through the communication hole 27. doing. The electrolyte solution holding unit 24 is provided with an absorbing material 40 to be described later, and holds the electrolyte solution leaked from the gas vent hole 13 of the battery 10 to the inside of the positive electrode side holding unit 22. More specifically, the electrolyte leaked from the gas vent hole 13 of the battery 10 to the inside of the positive electrode side holding portion 22 flows from the bottom portion 221 of the positive electrode side holding portion 22 into the communication hole 27 through the step portion 223 and communicates therewith. It flows into the electrolytic solution holding part 24 from the hole 27 and is absorbed and held by the absorbent 40. For example, the above-described assembled battery will be described as an example. The electrolyte leaking from the third battery 10c to the inside of the positive electrode side holding portion 22b of the second battery holder 2b is absorbed and held by the absorbent 40b through the communication hole 27b. (FIG. 5). Further, for example, the electrolyte solution leaked from the fifth battery 10e to the inside of the positive electrode side holding portion 22d of the fourth battery holder 2d is absorbed and held by the absorbent 40d through the communication hole 27d (FIG. 5).

  The lead plate 30 is made of, for example, a conductive material such as a metal plate, and electrically connects the negative electrode terminal 11 of the battery 10 held by the negative electrode side holding unit 21 and the positive electrode terminal 12 of the battery 10 held by the positive electrode side holding unit 22. It is a member to connect. The lead plate 30 has a substantially rectangular shape and is inserted into the opening 28 of the holder body 20. The opening 28 is formed inside the inner peripheral wall 25 of the holder body 20 and has a shape along the inner peripheral wall 25. In the lead plate 30, the first convex portion 31, the second convex portion 32, the third convex portion 33, and the fourth convex portion 34 formed at the four corners are respectively the first concave portions 251 of the inner peripheral wall portion 25 of the holder body 20. The second recess 252, the third recess 253, and the fourth recess 254 are positioned in the opening 28 while being engaged. The lead plate 30 has one end side welded to the negative electrode terminal 11 of the battery 10 held by the negative electrode side holding portion 21 and the other end side welded to the positive electrode terminal 12 of the battery 10 held by the positive electrode side holding portion 22. This welding can be performed through the opening 28 of the holder body 20. For example, in the case of the assembled battery described above, the lead plate 30b is inserted into the opening 28b of the second battery holder 2b, and the lead plate 30b allows the negative electrode terminal 11b of the second battery 10b and the third battery 10c to be connected. The positive terminal 12c is electrically connected (FIG. 5). A lead plate 30d is inserted into the opening 28d of the fourth battery holder 2d, and the lead plate 30d electrically connects the negative terminal 11d of the fourth battery 10d and the positive terminal 12e of the fifth battery 10e. (FIG. 5).

  The absorbent material 40 is made of a material having water absorption, such as a low density foam material, and is disposed in the electrolyte solution holding unit 24. The absorbent material 40 is a member having a shape that follows the shape of the electrolyte solution holding portion 24, and a rectangular hole 41 is formed at substantially the center. The rectangular hole 41 is formed with four concave portions 43 to 46 corresponding to the outer peripheral surfaces of the first concave portion 251, the second concave portion 252, the third concave portion 253, and the fourth concave portion 254 of the inner peripheral wall portion 25 of the holder body 20, respectively. ing. In the absorbent material 40, the inner peripheral surface of the rectangular hole 41 is in contact with the outer peripheral surface of the inner peripheral wall portion 25 of the electrolytic solution holding portion 24, and the outer peripheral surface 42 is in contact with the inner peripheral surface of the outer peripheral wall portion 26 of the electrolytic solution holding portion 24. In this state, the electrolyte solution holding unit 24 is provided.

  In the battery holder 2 according to the present invention having such a configuration, the electrolyte leaked from the positive electrode side of the battery 10 to the inside of the positive electrode side holding portion 22 is provided outside the positive electrode side holding portion 22 through the communication hole 27. Then, it flows into the electrolyte holding unit 24 and is held by the electrolyte holding unit 24. Thereby, the possibility that the electrolyte leaked from the positive electrode side of the battery 10 flows out of the battery holder 2 can be reduced. Therefore, according to the battery holder 2 according to the present invention, in the battery unit using the assembled battery, it is possible to reduce the possibility that the battery 10 is short-circuited due to the electrolyte solution leaking from the battery 10.

  Further, in the battery holder 2 according to the present invention, the electrolyte solution holding part 24 preferably includes an absorbent material 40 that absorbs and holds the electrolyte solution as in the above-described embodiment. As a result, the electrolyte solution leaking from the positive electrode side of the battery 10 is absorbed and held by the absorbent 40, so that the possibility of the electrolyte solution flowing out of the battery holder 2 can be further reduced.

  Moreover, the battery holder 2 according to the present invention preferably includes an opening 28 that communicates from the outside to the negative electrode terminal 11 of the battery 10 and the positive electrode terminal 12 of the battery 10 as in the above-described embodiment. Thus, in a state where the two batteries 10 are connected, the negative terminal 11 of one battery 10 and the positive terminal 12 of the other battery 10 can be connected. Work efficiency can be improved.

  Moreover, it is preferable that the battery holder 2 according to the present invention is configured to hold two batteries 10 that are the minimum structural unit of the assembled battery as in the above-described embodiment. Thereby, the freedom degree of arrangement | positioning of each battery 10 in an assembled battery can be raised. That is, for example, as in the assembled battery illustrated in FIGS. 2 and 3, if the assembled battery is configured by connecting a large number of batteries 10 using a plurality of battery holders 2 according to the present invention, a wide variety of battery 10 arrangements are possible. The assembled battery can be configured flexibly corresponding to the number. As a result, it is not necessary to design a battery holder or the like in accordance with the configuration of the assembled battery, the number of the batteries 10, and the like, so that the cost of the assembled battery can be greatly reduced.

2 Battery holders 2a to 2g First to seventh battery holders 10 Batteries 10a to 10h First to eighth batteries 20 Holder body 21 Negative electrode side holding part 22 Positive electrode side holding part 23 Base 24 Electrolyte holding part 25 Inner peripheral wall part 26 Outer circumference Wall 27 Communication hole 28 Opening 30 Lead plate 40 Absorbent

Claims (4)

A negative electrode side holding part for holding the negative electrode side of the first battery;
A positive electrode side holding portion for holding a positive electrode side of a second battery adjacent to the first battery;
An electrolytic solution holding unit that is provided outside the positive electrode side holding unit and holds the electrolytic solution;
A battery holder comprising: a communication hole that communicates the inside of the positive electrode side holding portion and the electrolyte solution holding portion.   The battery holder according to claim 1, wherein the electrolytic solution holding part includes an absorbent material that absorbs and holds the electrolytic solution.   3. The battery holder according to claim 1, further comprising an opening communicating from the outside to the negative terminal of the first battery and the positive terminal of the second battery. A first battery;
A second battery adjacent to the first battery;
A battery holder for holding the first battery and the second battery,
The battery holder includes a negative electrode side holding portion that holds a negative electrode side of the first battery;
A positive electrode side holding part for holding the positive electrode side of the second battery;
An electrolytic solution holding unit that is provided outside the positive electrode side holding unit and holds the electrolytic solution;
An assembled battery including a communication hole communicating the inside of the positive electrode side holding portion and the electrolyte solution holding portion.

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