WO2023188784A1 - Battery holder - Google Patents

Abstract

The present invention improves the adhesion of a battery holder to a secondary battery. This battery holder comprises a first holder member and a second holder member that sandwich a cylindrical secondary battery therebetween from the radially outside of the secondary battery, and are joined to each other. The first holder member and the second holder member each have a first member that comes into contact with a peripheral side surface of the secondary battery and is deformable, and a second member that is disposed outside the first member in the radial direction of the secondary battery and is harder than the first member.

Description

battery holder

The present disclosure relates to a battery holder.

Patent Document 1 discloses a battery holding device having a holder that holds a plurality of cylindrical secondary batteries. The holder is constructed by laminating a plurality of metal plates. Further, the holder holds the circumferential side of the secondary battery from the outside in the radial direction, and holds the plurality of secondary batteries in parallel.

JP2015-005412A

In a cylindrical secondary battery, the outer diameter of the secondary battery has a design dimensional tolerance. On the other hand, the holder of Patent Document 1 is made of metal and has a structure in which the portion that contacts the peripheral side of the secondary battery does not deform. Therefore, if the outer diameter of the secondary battery is small within the dimensional tolerance, the holder of Patent Document 1 and the peripheral surface of the secondary battery may not come into close contact with each other, and the holder may not be able to properly hold the secondary battery. be.

The present disclosure has been made in view of the above, and an object of the present disclosure is to improve adhesion with a secondary battery in a battery holder.

The battery holder of the present disclosure includes a first holder member and a second holder member that sandwich the cylindrical secondary battery from the outside in the radial direction and are coupled to each other, and the first holder member and the second holder member are coupled to each other. The holder member and the second holder member each contact a circumferential surface of the secondary battery and include a deformable first member, and a first member that is disposed radially outward of the secondary battery from the first member, and and a second member that is harder than the first member.

According to the present disclosure, it is possible to improve the adhesion with the secondary battery in the battery holder.

FIG. 1 is a perspective view of a battery pack to which a battery holder according to a first embodiment is applied. FIG. 2 is an exploded perspective view of the battery pack. FIG. 3 is a side view of the first holder member. FIG. 4 is a side view of the second holder member. FIG. 5 is a side view showing a state in which the first holder member, the second holder member, and the third holder member are combined. FIG. 6 is a side view of the first holder member in the battery holder according to the second embodiment. FIG. 7 is a sectional view of the first holder member in the battery holder according to the third embodiment.

Hereinafter, embodiments will be described in detail based on the drawings. Note that the present disclosure is not limited to this embodiment. It goes without saying that each embodiment is an example, and that parts of the configurations shown in different embodiments can be replaced or combined. In the second embodiment and subsequent embodiments, descriptions of common matters with the first embodiment will be omitted, and only different points will be explained. In particular, similar effects due to similar configurations will not be mentioned for each embodiment.

<First embodiment>
FIG. 1 is a perspective view of a battery pack to which a battery holder according to a first embodiment is applied. FIG. 2 is an exploded perspective view of the battery pack.

The battery pack 1 can be applied as a power source to electronic devices, electric vehicles, power tools, and the like. The battery pack 1 includes an outer case 10 and a battery unit 20, as shown in FIG.

The exterior case 10 is box-shaped and houses the battery unit 20. The exterior case 10 has a first case part 11 and a second case part 12. As shown in FIG. 2, the battery unit 20 includes a plurality of secondary batteries 30, a lead plate 40, a battery holder 50, and a plurality of coupling members 60. The coupling member 60 is, for example, a screw.

The secondary battery 30 is, for example, a lithium ion battery. The secondary battery 30 has a cylindrical shape. The plurality of secondary batteries 30 are arranged in parallel. Further, the plurality of secondary batteries 30 are arranged in such a manner that the positive electrode terminal 31 on one end face of both end faces and the negative electrode terminal 32 on the other end face have a predetermined orientation. It is being It goes without saying that the arrangement of the plurality of secondary batteries 30 is not limited to this arrangement.

The lead plate 40 is electrically connected to the terminal of the secondary battery 30. Specifically, the battery pack 1 has a plurality of lead plates 40, and each of the plurality of lead plates 40 connects the secondary battery 30 so that the plurality of secondary batteries 30 are electrically connected in series or in parallel. It is electrically connected to a positive terminal 31 and a negative terminal 32 of.

The battery holder 50 holds the secondary battery 30. The battery holder 50 includes a first holder member 51, a second holder member 52, and a third holder member 53. The first holder member 51 and the second holder member 52 hold the plurality of secondary batteries 30 by sandwiching the plurality of secondary batteries 30 from the outside in the radial direction of the secondary batteries 30.

FIG. 3 is a side view of the first holder member 51. The first holder member 51 includes a first soft part 51a as a first member, a first hard part 51b as a second member, and a first coupling part 51c.

There are a plurality of first soft parts 51a (for example, five). The plurality of first soft parts 51a each have an arcuate cross section with a substantially constant wall thickness, and are arranged in parallel. The first soft portion 51a is deformable. The first soft portion 51a has a soft groove Sf as a first groove in which the secondary battery 30 is placed.

The soft groove Sf contacts the peripheral side surface of the secondary battery 30. Specifically, the soft groove Sf contacts the peripheral side surface of the secondary battery 30 over the entire length of the secondary battery 30 in the axial direction. This improves battery retention. Note that, in the axial direction of the secondary battery 30, the soft groove Sf may be in contact with a part of the circumferential side of the secondary battery 30.

The first soft part 51a is made of a soft material as a deformable first material. Thereby, the adhesion between the first soft portion 51a and the secondary battery 30 can be improved. Moreover, the soft material is a material that can conduct heat. Note that the soft material may be an elastically deformable material.

The Young's modulus of the soft material is 100 MPa or less. The soft material may be any one of silicone rubber, acrylic rubber, urethane rubber, styrene-butadiene rubber, olefin elastomer, urethane elastomer, styrene elastomer, ester elastomer, and amide elastomer, or any one of these materials. It is a material containing at least one selected from the following materials. Note that it goes without saying that the Young's modulus of the soft material is 100 MPa or less, and that the soft material is not limited to these materials.

The first soft portion 51a may be formed of one of the above-mentioned soft materials mixed with a material having high thermal conductivity such as a metal filler. According to this, the first soft part 51a has improved heat conduction performance and can more easily release heat generated from the secondary battery 30 to the outside than when the first soft part 51a is formed only of the above-mentioned soft material.

Note that the "Young's modulus" of a soft material can be determined by a general measurement method. For example, when the soft material is a resin material, it is determined according to the resin material tensile test standard of JIS K7161 (ISO 527). Further, when the soft material is a rubber material, it is determined according to rubber material tensile test standards such as JIS K6250 (ISO 23529), JIS K6251 (ISO 37), and JIS K6272 (ISO 5893).

Further, the outer diameter of the secondary battery 30 has a design dimensional tolerance and has a predetermined range. Based on this predetermined range of the outer diameter of the secondary battery 30, the inner diameter of the soft groove Sf is determined to be equal to or less than the minimum value of the outer diameter of the secondary battery 30. Thereby, the adhesion between the first soft portion 51a and the secondary battery 30 can be reliably improved.

Furthermore, the inner diameter of the soft groove Sf is a predetermined first percentage (e.g., 20%) smaller than the minimum value of the outer diameter of the secondary battery 30 (e.g., 80% of the minimum value of the outer diameter of the secondary battery 30). ) or more. The first ratio is calculated, for example, based on the stress generated in the first soft part 51a and the first hard part 51b when the first holder member 51 and the second holder member 52 hold the secondary battery 30. Thereby, damage to the first holder member 51 can be prevented. The inner diameters of the soft grooves Sf of the plurality of first soft parts 51a are equal to each other.

There are a plurality of first hard parts 51b (for example, five). Each of the plurality of first hard parts 51b has an arcuate cross-section and a substantially constant wall thickness. The first hard part 51b is harder than the first soft part 51a. The first hard part 51b is arranged radially outward of the secondary battery 30 from the first soft part 51a. The first hard part 51b has a hard groove Sh as a second groove in which the first soft part 51a is arranged.

The plurality of first hard parts 51b are arranged in parallel. The ends of two adjacent first hard parts 51b in the parallel direction are integrally formed, so that the plurality of first hard parts 51b are integrated. In addition, the ends of the two first hard parts 51b adjacent to each other in the parallel direction are constituted by a first hard end surface Sk1. Note that, among the plurality of first hard parts 51b, the outer ends in the parallel direction of the first hard parts 51b located at both ends in the parallel direction are constituted by second hard end surfaces Sk2.

The first hard end surface Sk1 and the second hard end surface Sk2 are located on the same plane. Further, the first soft portion 51a is not arranged on the first hard end surface Sk1 and the second hard end surface Sk2.

The first hard part 51b is made of a hard material as a second material. The hard material is harder than the soft material described above. A hard material is a material that has relatively high rigidity and is relatively difficult to deform. Thereby, even when the battery holder 50 holds the secondary battery 30, deformation of the battery holder 50 can be suppressed. Moreover, the hard material is a material that can conduct heat.

The Young's modulus of the hard material is 700 MPa or more. The hard material is a thermoplastic resin. Thereby, deformation of the battery holder 50 is reliably suppressed. It goes without saying that the Young's modulus of the hard material is not limited to 700 MPa or more, and that the hard material is not limited to thermoplastic resin. Note that the "Young's modulus" of a hard material is determined in the same manner as the "Young's modulus" of a soft material.

The first hard part 51b may be formed of a thermoplastic resin mixed with other materials. Examples of other materials include glass fiber reinforced plastic, carbon fiber reinforced plastic, long glass fiber mat reinforced thermoplastic plastic, boron fiber reinforced plastic, aramid fiber reinforced plastic, Kepler fiber reinforced plastic, Daimani fiber reinforced plastic, and Zylon reinforced plastic. , wood/plastic composite materials, etc. According to this, the first hard part 51b has improved impact resistance than when it is formed only of thermoplastic resin, and it becomes easier to suppress the impact when the battery pack 1 is dropped.

Furthermore, based on the predetermined range of the outer diameter of the secondary battery 30 described above, the inner diameter of the hard groove Sh is set to be equal to or larger than the maximum value of the outer diameter of the secondary battery 30. Thereby, the first hard part 51b can appropriately hold the secondary battery 30 via the first soft part 51a.

Further, the inner diameter of the hard groove Sh is a predetermined second percentage (for example, 20%) larger than the maximum outer diameter of the secondary battery 30 (for example, 120% of the maximum diameter of the secondary battery 30). It is defined below. The second ratio is calculated, for example, based on the stress generated in the first soft part 51a and the first hard part 51b when the first holder member 51 and the second holder member 52 hold the secondary battery 30. Thereby, damage to the first holder member 51 can be prevented. The inner diameters of the hard grooves Sh of the plurality of first hard parts 51b are equal to each other.

The first coupling portion 51c is a portion that is coupled to the second holder member 52 by the coupling member 60. There are a plurality of first coupling parts 51c (for example, four). The first coupling portions 51c are located on both sides of the plurality of first hard portions 51b in the parallel direction, and are integral with the first hard portions 51b. The first coupling portion 51c has a cylindrical shape with both ends open. The first contact end surface St1, which is the end surface of the first coupling portion 51c that contacts the second holder member 52, is located on the same plane as the second hard end surface Sk2.

The third holder member 53 is formed similarly to the first holder member 51, and includes a plurality of third soft parts 53a, a plurality of third hard parts 53b, and a plurality of third hard parts 53b, as shown in FIG. A third coupling portion 53c is provided. The third soft part 53a and the third hard part 53b correspond to the first soft part 51a and the first hard part 51b of the first holder member 51, respectively. The third hard portion 53b has a seventh hard end surface Sk7 and an eighth hard end surface Sk8. The seventh hard end surface Sk7 and the eighth hard end surface Sk8 correspond to the first hard end surface Sk1 and the second hard end surface Sk2 of the first hard portion 51b.

Furthermore, the third coupling portion 53c corresponds to the first coupling portion 51c of the first holder member 51. The third coupling portion 53c has a fourth contact end surface St4 corresponding to the first contact end surface St1. Note that the number of the third soft part 53a, the third hard part 53b, and the third joint part 53c may be different from the number of the first soft part 51a, the first hard part 51b, and the first joint part 51c.

The third holder member 53 sandwiches the secondary battery 30 with the second holder member 52 from the radially outer side of the secondary battery 30 on the opposite side with the second holder member 52 in between.

FIG. 4 is a side view of the second holder member. The second holder member 52 includes a second soft part 52a, a second hard part 52b, and a second coupling part 52c.

There are a plurality of second soft parts 52a (for example, 10 pieces), and they are formed in the same manner as the first soft part 51a described above. That is, the second soft portion 52a has a soft groove Sf and is made of a soft material. The plurality of second soft parts 52a are divided into two groups. Hereinafter, the second soft parts 52a of the first set will be described with a suffix "1" added to the reference numerals, and the second soft parts 52a of the second set will be described with the suffix "2" added to the numbers. Note that when the two groups are to be explained without distinguishing them, the explanation will be made without adding subscripts. The soft groove Sf of the second soft part 52a1 of the first set and the soft groove Sf of the second soft part 52a2 of the second set face opposite to each other.

The first set of second soft parts 52a1 are arranged in parallel and sandwich the first soft part 51a of the first holder member 51 and the secondary battery 30 from the radial outside of the secondary battery 30. The soft groove Sf of the second soft part 52a1 of the first set faces the soft groove Sf of the first soft part 51a.

The second set of second soft parts 52a2 are arranged in parallel and sandwich the secondary battery 30 from the third soft part 53a of the third holder member 53 and the secondary battery 30 from the radial outside. The soft groove Sf of the second soft part 52a2 of the second set faces the soft groove Sf of the third soft part 53a.

There are a plurality of second hard parts 52b (for example, ten), and they are formed in the same manner as the first hard part 51b described above. That is, the second hard part 52b has a hard groove Sh and is made of a hard material. The plurality of second hard parts 52b are divided into two groups. Hereinafter, the second hard portions 52b of the first set will be described with a suffix “1” added to the reference numerals, and the second hard portions 52b of the second set will be described with the suffix “2” added to the numerals. Note that when the two groups are to be explained without distinguishing them, the explanation will be made without adding subscripts. The hard groove Sh of the second hard part 52b1 of the first set and the hard groove Sh of the second hard part 52b2 of the second set face opposite to each other.

The first set of second hard parts 52b1 are arranged in parallel. The first set of second soft parts 52a1 are arranged in the hard grooves Sh of the first set of second hard parts 52b1. The second hard part 52b1 of the first set is integrally formed like the first hard part 51b described above. The second hard portion 52b1 of the first set has a third hard end surface Sk3 and a fourth hard end surface Sk4 that contact the first hard end surface Sk1 and the second hard end surface Sk2 of the first hard portion 51b. The first set of second soft portions 52a1 are not arranged on the third hard end surface Sk3 and the fourth hard end surface Sk4.

The second hard parts 52b2 of the second set are arranged in parallel. The second soft portion 52a2 of the second set is arranged in the hard groove Sh of the second hard portion 52b2 of the second set. The second hard part 52b2 of the second set is integrally formed like the first hard part 51b described above. The second hard portion 52b2 of the second set has a fifth hard end surface Sk5 and a sixth hard end surface Sk6 that contact the seventh hard end surface Sk7 and the eighth hard end surface Sk8 of the third hard portion 53b. The second set of second soft portions 52a2 is not arranged on the fifth hard end surface Sk5 and the sixth hard end surface Sk6. Furthermore, the first set of second hard parts 52b1 and the second set of second hard parts 52b2 are integrally formed.

There are a plurality of second coupling portions 52c (for example, eight), and the second coupling portions 52c have a cylindrical shape and have a screw hole for coupling with the coupling member 60, which is a screw. The second coupling portion 52c is divided into two groups. Hereinafter, the second coupling portions 52c of the first set will be described with a suffix “1” attached to the reference numerals, and the second coupling portions 52c of the second set will be explained with the suffix “2” attached to the reference numerals. Note that when the two groups are to be explained without distinguishing them, the explanation will be made without adding subscripts.

The second coupling portion 52c1 of the first set is coupled to the first coupling portion 51c of the first holder member 51 by the coupling member 60. The second coupling portion 52c1 of the first set has a second contact end surface St2 that contacts the first contact end surface St1 of the first coupling portion 51c.

The second coupling portion 52c2 of the second set is coupled to the third coupling portion 53c of the third holder member 53 by the coupling member 60. The second coupling portion 52c2 of the second set has a third contact end surface St3 that contacts the fourth contact end surface St4 of the third coupling portion 53c.

FIG. 5 is a side view showing a state in which the first holder member, the second holder member, and the third holder member are combined.

In a state where the first holder member 51 and the second holder member 52 are coupled, the first contact end surface St1 of the first coupling portion 51c and the second contact end surface St2 of the second coupling portion 52c1 of the first set are are in contact. Further, the first hard end surface Sk1 and the second hard end surface Sk2 of the first hard part 51b and the third hard end surface Sk3 and the fourth hard end surface Sk4 of the second hard part 52b1 of the first set are the same as those of the secondary battery 30. They are in contact on the outside in the radial direction.

Specifically, the first contact end surface St1 and the second contact end surface St2 are in direct contact without interposing the first soft portion 51a. Further, the first hard end surface Sk1, the second hard end surface Sk2, the third hard end surface Sk3, and the fourth hard end surface Sk4 are in direct contact without interposing the first soft portion 51a. Therefore, the position of the first holder member 51 relative to the second holder member 52 can be stabilized. Thereby, the amount of deformation of each of the first soft portion 51a and the first set of second soft portions 52a1 that sandwich the secondary battery 30 can be stabilized at a desired amount of deformation.

In the state where the second holder member 52 and the third holder member 53 are coupled, the third contact end surface St3 of the second coupling portion 52c of the second set and the fourth contact end surface St4 of the third coupling portion 53c are are in contact. Further, the fifth hard end surface Sk5 and the sixth hard end surface Sk6 of the second hard portion 52b of the second set, and the seventh hard end surface Sk7 and the eighth hard end surface Sk8 of the third hard portion 53b are the same as those of the secondary battery 30. They are in contact on the outside in the radial direction.

Specifically, the third contact end surface St3 and the fourth contact end surface St4 are in direct contact without interposing the first soft portion 51a. Further, the fifth hard end surface Sk5, the sixth hard end surface Sk6, the seventh hard end surface Sk7, and the eighth hard end surface Sk8 are in direct contact without interposing the first soft portion 51a. Therefore, the position of the third holder member 53 with respect to the second holder member 52 can be stabilized. Thereby, the amount of deformation of each of the third soft portion 53a and the second set of second soft portions 52a2 that sandwich the secondary battery 30 can be stabilized at a desired amount of deformation.

Furthermore, as described above, the first soft part 51a, the second soft part 52a, and the third soft part 53a are in close contact with the peripheral side surface of the secondary battery 30. Therefore, the heat of the secondary battery 30 is efficiently transferred to the first soft part 51a, the second soft part 52a, and the third soft part 53a. The heat of the secondary battery 30 is transferred from the first soft part 51a, the second soft part 52a, and the third soft part 53a to the first hard part 51b, the second hard part 52b, and the third hard part 53b, and the heat is transferred to the battery holder 50. released to the outside. Therefore, the heat dissipation of the secondary battery 30 can be improved.

Furthermore, as described above, the first soft part 51a, the second soft part 52a, and the third soft part 53a are made of a deformable soft material. Therefore, even if the battery pack 1 were to fall, the impact acting on the battery holder 50 and therefore the secondary battery 30 is suppressed by the first soft part 51a, the second soft part 52a, and the third soft part 53a. Therefore, the impact resistance of the battery holder 50 can be improved.

Furthermore, even when the battery pack 1 vibrates during actual use of the battery pack 1, the first soft part 51a, the second soft part 52a, and the third soft part 53a can suppress the vibration of the secondary battery 30. . Therefore, the vibration resistance of the battery holder 50 can be improved.

<Second embodiment>
Next, regarding the battery holder 50 according to the second embodiment, mainly the different parts from the battery holder 50 according to the above-described first embodiment will be explained.

FIG. 6 is a side view of the first holder member in the battery holder according to the second embodiment. In the plurality of first soft parts 51a according to the first embodiment, the soft grooves Sf each have the same inner diameter. On the other hand, in the plurality of first soft parts 151a of the first holder member 151 according to the second embodiment, the farther the first soft parts 151a are from the first coupling part 51c in the parallel direction, the smaller the inner diameter of the soft groove Sf. .

Specifically, among the plurality (five) of first soft parts 151a shown in FIG. 6, the first soft parts 151a at both ends in the parallel direction are closest to the first coupling part 51c. Then, in this order, the first soft parts 151a at both ends in the parallel direction, the first soft parts 151a adjacent to the first soft parts 151a at both ends in the parallel direction, and the first soft part 151a at the center in the parallel direction, It is separated from the first coupling portion 51c. Therefore, the inner diameter of the soft groove Sf in the first soft part 151a at both ends in the parallel direction is r3, and the inner diameter of the soft groove Sf in the first soft part 151a adjacent to the first soft part 151a at both ends in the parallel direction is r2. , and when the inner diameter of the soft groove Sf of the first soft portion 151a located at the center in the parallel direction is r1, r3, r2, and r1 are smaller in this order.

The farther the first soft part 151a is located from the first coupling part 51c, the lower the pressing force against the secondary battery 30 that is generated by the coupling of the first coupling part 51c and the second coupling part 52c. Therefore, as described above, by making the inner diameter of the soft groove Sf smaller as the first soft part 151a is farther away from the first coupling part 51c in the parallel direction, it is possible to suppress a decrease in the pressing force against the secondary battery 30. . Therefore, the adhesion with the secondary battery 30 can be improved.

In addition, in the plurality of second soft parts 52a of the second holder member 52 and the plurality of third soft parts 53a of the third holder member 53, similarly to the plurality of first soft parts 151a, in the parallel direction, The inner diameter of the soft groove Sf may be made smaller as the second soft part 52a and the third soft part 53a are further away from the second joint part 52c and the third joint part 53c.

<Third embodiment>
Next, regarding the battery holder 50 according to the third embodiment, mainly the different parts from the battery holder 50 according to the first embodiment described above will be described.

FIG. 7 is a cross-sectional view of the first holder member in the battery holder according to the third embodiment. Note that in the first holder member 251 of FIG. 7, illustration of the first soft portion 51a is omitted.

In the cross-sectional view of the plurality of first hard parts 251b in a state before being combined with the second holder member 52, the first holder member 251 of the third embodiment has two of the plurality of hard grooves Sh at both ends in the parallel direction. With respect to the straight line L connecting the ends, the ends of the plurality of hard grooves Sh other than the two ends are located on the opposite side to the bottoms B of the plurality of hard grooves Sh.

Specifically, in a cross-sectional view, the two ends of the plurality of hard grooves Sh at both ends in the parallel direction are points P1 and P2 at the end of the second hard end surface Sk2, and the straight line L is between the points P1 and P2. It is a straight line connecting these.

Further, the ends of the plurality of hard grooves Sh other than the two ends of the plurality of hard grooves Sh at both ends in the parallel direction are points Q1, Q2, Q3, Q4, Q5, Q6, Q7 at the end of the first hard end surface Sk1. , Q8, and is located on the side opposite to the bottoms B of the plurality of hard grooves Sh with respect to the straight line L. As a result, when the first coupling part 251c of the first holder member 251 is not coupled with the second coupling part 52c of the second holder member 52, the hard groove Sh on the inside in the parallel direction is connected to the hard groove Sh on the inside in the parallel direction. It is closer to the second holder member 52 than the groove Sh. Then, when the first coupling part 251c of the first holder member 251 is coupled with the second coupling part 52c of the second holder member 52, as shown in FIG. The hard end surface Sk2 contacts the third hard end surface Sk3 and the fourth hard end surface Sk4 of the second hard portion 52b1 of the first set.

As described above, the farther the first soft part 51a is from the first joint part 51c, that is, the farther inside the first soft part 51a is in the parallel direction, the more the first joint part 51c and the second joint part 52c are connected. The pressing force on the secondary battery 30 generated by the bonding is reduced. Therefore, as described above, the hard groove Sh on the inside in the parallel direction is closer to the second holder member 52 than the hard grooves Sh on both ends in the parallel direction, so that the pressing force against the secondary battery 30 on the inside in the parallel direction is reduced. can be suppressed. Therefore, the adhesion with the secondary battery 30 can be improved.

Furthermore, in a cross-sectional view, the hard groove Sh may be arranged so that the end of the hard groove Sh that is further away from the first coupling portion 51c in the parallel direction is further away from the straight line L. In this case, in a cross-sectional view, lines connecting the ends of the plurality of hard grooves Sh from one side to the other in the parallel direction, that is, points P1, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 , P2 in this order has a substantially circular arc shape that protrudes to the side opposite to the bottom B of the hard groove Sh.

Note that, similarly to the first holder member 51, in the third holder member 53, in a cross-sectional view of the plurality of third hard parts 53b in a state before being combined with the second holder member 52, a plurality of third hard parts 53b at both ends in the parallel direction are With respect to the straight line connecting the two ends of the hard groove Sh, the ends of the hard grooves Sh other than those two ends may be located on the side opposite to the bottoms B of the hard grooves Sh. In this case, the two ends of the plurality of hard grooves Sh at both ends in the parallel direction are at the ends of the eighth hard end surface Sk8 in cross-sectional view. Moreover, the ends of the plurality of third hard parts 53b other than the two ends of the plurality of third hard parts 53b at both ends in the parallel direction are located at the end of the seventh hard end surface Sk7 in cross-sectional view.

Note that the embodiments described above are intended to facilitate understanding of the present disclosure, and are not intended to be interpreted as limiting the present disclosure. This disclosure may be modified/improved without departing from its spirit, and the present disclosure also includes equivalents thereof.

For example, the first holder member 51 and the second holder member 52 may be coupled by a snap fit. In this case, the battery pack 1 does not have the coupling member 60, and the first coupling part 51c and the second coupling part 52c are each formed by a hook constituting a snap fit, and a convex part and a concave part on which the hook is caught. be done. Note that the second holder member 52 and the third holder member 53 may also be connected by snap fit.

Furthermore, the battery holder 50 does not need to have the third holder member 53. In this case, the second holder member 52 includes a first set of second soft parts 52a1, a first set of second hard parts 52b1, and a first set of second coupling parts 52c1.

1 Battery pack 30 Secondary battery 50 Battery holder 51 First holder member 51a First soft part (first member)
51b First hard part (second member)
51c First joint part (joint part)
52 Second holder member 52a Second soft part (first member)
52b Second hard part (second member)
52c Second joint part (joint part)
53 Third holder member 53a Third soft part (first member)
53b Third hard part (second member)
53c Third joint part (joint part)
B Bottom L Straight Sf Soft groove (first groove)
Sh Hard groove (second groove)

Claims (10)

comprising a first holder member and a second holder member that sandwich the cylindrical secondary battery from the outside in the radial direction and are coupled to each other;
The first holder member and the second holder member each include:
a first member that is in contact with the peripheral side of the secondary battery and is deformable;
a second member disposed radially outward of the secondary battery from the first member and harder than the first member;
battery holder. The first member is in contact with a peripheral side surface of the secondary battery over the entire length of the secondary battery in the axial direction.
The battery holder according to claim 1. The second member of the first holder member and the second member of the second holder member are in contact with each other on the radially outer side of the secondary battery.
The battery holder according to claim 1 or 2. The secondary battery is held between the second holder member and the second holder member from the radially outer side of the secondary battery on the opposite side of the first holder member across the second holder member, and the first member and the second further comprising a third holder member having a member;
The battery holder according to any one of claims 1 to 3. The first member has a first groove in which the secondary battery is placed,
The first holder member has a plurality of first members arranged in parallel and a coupling portion that couples with the second holder member,
In the parallel direction, the further the first member is from the coupling portion, the smaller the inner diameter of the first groove is.
The battery holder according to any one of claims 1 to 4. The second member has a second groove in which the first member is disposed,
The first holder member has a plurality of second members arranged in parallel, and a coupling portion coupled to the second holder member on both sides of the plurality of second members in the parallel direction,
In a cross-sectional view of the plurality of second members in a state before the first holder member is combined with the second holder member, a straight line connecting two ends of the plurality of second grooves at both ends in the parallel direction On the other hand, the ends of the plurality of second grooves other than the two ends are located on the opposite side from the bottoms of the plurality of second grooves,
The battery holder according to any one of claims 1 to 4. The first member includes a first material,
Young's modulus of the first material is 100 MPa or less,
The battery holder according to any one of claims 1 to 6. The first material is any one of silicone rubber, acrylic rubber, urethane rubber, styrene-butadiene rubber, olefin elastomer, urethane elastomer, styrene elastomer, ester elastomer, and amide elastomer.
The battery holder according to claim 7. the second member includes a second material;
The Young's modulus of the second material is 700 MPa or more.
The battery holder according to any one of claims 1 to 8. the second material is a thermoplastic resin;
The battery holder according to claim 9.

Images