CN216980694U

CN216980694U - Battery pack

Info

Publication number: CN216980694U
Application number: CN201990001331.3U
Authority: CN
Inventors: 田文秀
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2019-02-21
Filing date: 2019-12-20
Publication date: 2022-07-15
Anticipated expiration: 2029-12-20
Also published as: KR20200102185A; KR102296127B1; WO2020171363A1

Abstract

The utility model discloses a battery pack. The battery pack includes: a battery cell; a cooling member having a heat absorbing part disposed at a central region in a length direction of the battery cell and heat dissipating parts disposed at both end regions in the length direction of the battery cell; and a unit holder that accommodates the battery unit and the cooling member together, wherein a contact surface that is in elastic pressure contact with the cooling member is formed on one side of the unit holder. According to the present invention, there is provided an assembled battery in which durability of heat dissipation performance can be maintained for a long time while heat dissipation performance is improved.

Description

Battery pack

Technical Field

The present invention relates to a battery pack.

Background

Unlike a primary battery that is not rechargeable, a secondary battery is generally a battery that can be charged and discharged. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies (uninterruptible power supplies), and the like, and may be used in the form of a single battery or in the form of a module in which a plurality of batteries are connected and bundled into a unit, depending on the type of external device to be used.

A small-sized mobile device such as a portable phone can be operated for a predetermined time using the output and capacity of a single battery, but in a case where a long-time driving, a high-power driving is required such as an electric vehicle, a hybrid vehicle, etc., which consume large power, a module form including a plurality of batteries is preferably adopted due to the problems of the output and capacity, and the output voltage or the output current can be increased according to the number of built-in batteries.

SUMMERY OF THE UTILITY MODEL

Technical problem

One aspect of the utility model includes an assembled battery with improved durability, which can maintain heat dissipation performance of the assembled battery for a long time while heat dissipation performance of the assembled battery can be improved.

Technical scheme

A battery pack of the present invention includes: a battery cell; a cooling member having a heat absorbing part disposed at a central region in a length direction of the battery cell and heat dissipating parts disposed at both end regions in the length direction of the battery cell; and

and a unit holder that accommodates the battery unit and the cooling member together, wherein a contact surface that is in elastic pressure contact with the cooling member is formed on one side of the unit holder.

For example, the unit clamp may include: a battery housing portion for housing the battery unit; and a receiving groove for receiving the cooling member, wherein the receiving groove may be formed in a valley region between battery receiving parts adjacent to each other in outer circumference.

For example, the unit clamp may include: and a first jig and a second jig coupled to face each other in a longitudinal direction of the battery unit, wherein battery receiving parts formed in the first jig and the second jig, respectively, are spatially connected to each other to receive the same battery unit, and receiving grooves formed in the first jig and the second jig, respectively, are spatially separated from each other to receive cooling members different from each other.

For example, the receiving groove may be formed by a space between a blocking wall formed at a central region of the unit holder in a length direction of the battery cell and assembly openings formed at both end regions of the unit holder in the length direction of the battery cell.

For example, the first jig and the second jig may be arranged to face each other in such a manner that the blocking walls are adjacent to each other.

For example, the cooling member may be resiliently biased towards the blocking wall.

For example, the contact surface may be formed on an inner wall of the receiving groove between both end regions and a middle region of the unit clamp.

For example, the contact face may have a spatial gradient between an innermost end of the two end regions adjacent the unit clamp and an outermost end of the two end regions adjacent the central region.

For example, the contact surface may include an inclined surface inclined outward from the innermost end portion to the outermost end portion.

For example, the contact surfaces may be formed in pairs on both sides of the receiving groove.

For example, the cooling part may include: a main body portion including the heat absorbing portion and the heat dissipating portion on one end side and the other end side in a longitudinal direction; and an elastic piece extending in a manner branching from the main body portion.

For example, the heat absorbing part is disposed inside the unit jig, and at least a portion of the heat dissipating part may be exposed outside the unit jig.

For example, a buffer member extending in a length direction of the battery cell while surrounding the heat sink may be formed at an outer circumference of the heat sink.

For example, the elastic piece may be elastically biased to the outside in a manner away from the main body portion.

For example, the elastic piece may include a connecting portion formed at one end and located to be connected to the main body portion, and a contact portion formed at the other end and elastically pressing the contact surface to be in contact therewith.

For example, the contact face may have a spatial gradient between an innermost end adjacent the two end regions of the unit clamp and an outermost end adjacent the central region, and the connection may provide a resilient hinge to resiliently bias the opposite contact portion towards the outermost end of the contact face.

For example, the elastic piece may have a spatial gradient from the connecting portion near the central region of the unit clamp toward the contact portion near the both end regions.

For example, the elastic piece may have an outward inclination from the connecting portion to the contact portion.

For example, the elastic sheet and the contact surface may be brought into pressing contact with each other and have gradients or inclinations in opposite directions to each other.

Technical effects

According to the present invention, there is provided an assembled battery having improved durability, which is capable of improving heat dissipation performance of the assembled battery by fixing the position of a cooling member in such a manner that a heat absorbing part of the cooling member and a center region of a battery cell are aligned with each other, while preventing a situation in which the heat dissipation performance of the assembled battery is degraded due to a positional shift of the cooling member or detachment from the center region of the battery cell caused by a decrease in restraining force against the cooling member over time, by fixing the position of the cooling member by elastic biasing.

Drawings

Fig. 1 and 2 show exploded perspective views different from each other illustrating assembly of battery cells and assembly of cooling members as exploded perspective views of a battery pack according to an embodiment of the present invention.

Fig. 3 shows a diagram illustrating the arrangement of the battery cells and the cooling member.

Fig. 4 is a view showing an assembled state of the unit jig and the cooling member shown in fig. 2.

In fig. 5 is shown a perspective view taken along the line V-V of fig. 2.

Fig. 6 shows a perspective view of the cooling element shown in fig. 4.

Fig. 7 shows a battery pack according to another embodiment of the present invention.

PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION

A battery pack according to the present invention includes: a battery cell; a cooling member having a heat absorbing part disposed at a center region in a length direction of the battery cell and heat radiating parts disposed at both end regions of the battery cell in the length direction of the battery cell; and a unit holder that accommodates the battery unit and the cooling member, wherein a contact surface that is elastically pressed against the cooling member is formed on one side of the unit holder.

Detailed Description

Hereinafter, a battery pack according to a preferred embodiment of the present invention will be described with reference to the drawings.

Fig. 1 and 2 show exploded perspective views different from each other illustrating assembly of battery cells and assembly of cooling members as exploded perspective views of a battery pack according to an embodiment of the present invention. Fig. 3 shows a diagram illustrating the arrangement of the battery cells and the cooling member.

A battery pack according to an aspect of the present invention may include: a plurality of battery cells 10; a cooling part 20 for cooling the battery cell 10; the unit holder 100 is formed with a battery housing portion 101 for housing the battery unit 10 and a housing groove 102 for housing the cooling member 20.

The cell holder 100 may include a first holder 110 and a second holder 120 coupled to face each other in the length direction of the battery cell 10. The unit holder 100 may provide a battery housing part 101 capable of housing the entire length of the battery unit 10 by combining a first holder 110 and a second holder 120, which are separately formed, respectively. The battery receiving parts 101 of the first and

second clamps

110 and 120 may be connected to each other to provide the battery receiving parts 101 corresponding to the entire length of the battery unit 10, and for this, the battery receiving parts 101 of the first and

second clamps

110 and 120 may be spatially connected to each other in the length direction of the battery unit 10.

In an embodiment of the present invention, the entire unit jig 100 including the first jig 110 and the second jig 120 and the battery unit 10 may be formed to have lengths substantially corresponding to each other, and both end regions PE or the center region PC of the unit jig 100 and both end regions PE or the center region PC of the battery unit 10 may respectively represent substantially the same region. In this specification, the both end regions PE of the cell holder 100 and the both end regions PE of the battery cell 10 are given the same reference numerals, and the center region PC of the cell holder 100 and the center region PC of the battery cell 10 are given the same reference numerals for the sake of easy understanding. However, the technical scope of the present invention is not limited thereto, and in another embodiment of the present invention, the both end regions PE or the center region PC of the cell holder 100 and the both end regions PE or the center region PC of the battery cell 10 may be formed in different regions from each other, respectively.

In the present specification, the both-end regions PE of the battery cell 10 indicate not only both ends of the battery cell 10 but also may be used as a general meaning including both ends of the battery cell 10 and regions near both ends in the length direction of the battery cell 10. Further, the center region PC of the battery cell 10 may be used as a general meaning including not only the very center of the battery cell 10 but also the very center of the battery cell 10 and a region near the center in the longitudinal direction of the battery cell 10. As described later, the cooling part 20 of the present invention may include: a heat absorbing part disposed at the central region PC in a length direction of the battery cell 10; and heat dissipation parts disposed at both end regions PE in the longitudinal direction of the battery cell 10, in which case, the heat absorption parts of the cooling member 20 may be disposed at regions closer to the center of the battery cell 10 than both ends of the battery cell 10 in the longitudinal direction of the battery cell 10, and the heat dissipation parts of the cooling member 20 may be disposed at regions closer to both ends of the battery cell 10 than the center of the battery cell 10 in the longitudinal direction of the battery cell 10.

Similarly, in the present specification, the both-end regions PE of the unit jig 100 not only indicate both ends of the unit jig 100 but also can be used as a general meaning including both ends of the unit jig 100 and regions near both ends of the unit jig 100. Also, the unit clamp 100 center region PC indicates not only the very center of the unit clamp 100 but also can be used as a general meaning of a region including the very center of the unit clamp 100 and a region near the center of the unit clamp 100.

Both end portions of the battery cell 10 may be exposed to the outside of the cell holder 100 at both end regions PE of the cell holder 100, and electrical connection between the battery cells 10 different from each other may be accomplished through the exposed both end portions. In the plurality of battery cells 10 housed in the cell holder 100, the same polarities may be connected in parallel, and the opposite polarities may be connected in series, and for this reason, the battery cells 10 adjacent to each other may be arranged in the same arrangement direction, or may be arranged in an inverted direction such that both end portions thereof are inverted.

In one embodiment of the present invention, the battery housing 101 may have a circular cross section corresponding to the cylindrical outer shape of the battery cell 10, and may be formed in a plurality corresponding to the number of battery cells 10. The plurality of battery receiving parts 101 may be arranged in a matrix pattern in rows and columns, and a receiving groove 102 for receiving the cooling member 20 may be formed in a valley region between the battery receiving parts 101 arranged in a circumferentially adjacent manner. For example, the receiving grooves 102 may be formed in valley regions between four battery receiving parts 101 arranged adjacent to each other in the outer circumference in the column direction and the row direction, and may be formed at positions spaced apart from the adjacent battery receiving parts 101 by a uniform distance to provide uniform heat dissipation performance to the adjacent battery cells 10.

Fig. 4 is a view showing an assembled state of the unit holder and the cooling member shown in fig. 2. Fig. 5 shows a perspective view taken along line V-V of fig. 2.

Referring to fig. 2, 4 and 5 together, the receiving groove 102 may be defined as a space from the assembly opening 103 formed at both end regions PE of the unit jig 100 to the blocking wall 105 formed at the central region PC of the unit jig 100, and a space that can receive the cooling member 20 may be provided between the assembly opening 103 and the blocking wall 105. The receiving grooves 102 may be formed in the first jig 110 and the second jig 120, respectively, and the separately formed cooling member 20 may be received in the receiving grooves 102 of the first jig 110 and the second jig 120, respectively. That is, unlike the battery receiving parts 101 of the first and

second jigs

110 and 120, the receiving grooves 102 of the first and

second jigs

110 and 120 are not connected to each other by the combination of the first and

second jigs

110 and 120, and may be spatially separated from each other by the blocking wall 105. At this time, the first jig 110 and the second jig 120 may be arranged in such a manner that the blocking walls 105 face each other.

The housing groove 102 is assembled with a cooling member 20. For the assembly of the cooling member 20, the cooling member 20 is slidably assembled from the assembly openings 103 formed at the both end regions PE of the unit jig 100 toward the blocking wall 105 of the center region PC, and can be fixed in position in a state of being elastically biased against the blocking wall 105. For example, cooling parts 20 different from each other may be assembled to the assembly openings 103 of the first and

second jigs

110, 120 in directions facing each other, and may be arranged adjacent to each other in the blocking wall 105 region. As described later, in the blocking wall 105 region, the one end 20a side heat absorbing portions of the cooling members 20 different from each other may be adjacently disposed, and the region of the blocking wall 105 where the one end 20a side heat absorbing portions of the cooling members 20 different from each other are collectively disposed, that is, the center region PC of the unit clamp 100 can achieve effective cooling with respect to the center region PC of the battery unit 10.

The blocking wall 105 may provide a position alignment surface of the cooling member 20, and more particularly, may align a region of the one end 20a side heat absorbing part in the cooling member 20 to the central region PC of the battery cell 10. As will be described later, the heat absorbing portion on the one end 20a side of the cooling member 20 can absorb heat of the battery cell 10 as vaporization heat in association with the phase change of the working fluid, and the heat radiating portion on the other end 20b side of the cooling member 20 can radiate heat of the battery cell 10 as condensation heat. At this time, the cooling member 20 may absorb heat from the center region PC of the battery cell 10 and release heat from the both end regions PE of the battery cell 10, thereby preventing heat from being accumulated in the center region PC of the battery cell 10, which is relatively spaced from the external atmosphere and thus limiting heat release, and may release heat through the external atmosphere at the both end regions PE of the battery cell 10.

The unit jig 100 may be formed with a contact surface S that comes into pressing contact with a portion (more specifically, the elastic piece T) where the cooling member 20 is provided. The contact surface S may support the cooling member 20 in such a manner that the cooling member 20 is elastically biased toward the blocking wall 105. The contact surface S is formed between the both end regions PE and the central region PC of the unit clamp 100, and may have a spatial gradient between the innermost end SI near the both end regions PE and the outermost end SO near the central region PC. In an embodiment of the present invention, the contact surface S may include an inclined surface inclined outward from the innermost end SI toward the outermost end SO. As described later, the elastic sheet T of the cooling member 20 may be pressure-contacted to the contact surface S.

In one embodiment of the present invention shown in fig. 5, the contact surfaces S may be formed on the inner wall of the housing groove 102, and may be formed as a pair at positions facing each other of the housing groove 102. More specifically, the contact surface S may be formed at an inner wall of the receiving groove 102 defined as a space formed between the assembly opening 103 of the both end regions PE of the unit holder 100 and the blocking wall 105 formed at the center region PC of the unit holder 100, and for example, the receiving groove 102 may be connected with the outermost end SO and the innermost end SI of the contact surface S and form the contact surface S to have different widths from each other in the front and rear. The sectional shape of the receiving groove 102 may vary before and after the contact surface S, and for example, may be formed in a substantially circular sectional shape from the assembly openings 103 formed in the both end regions PE of the unit jig 100 to the contact surface S, and may be formed in a sectional shape including a key hole (key hole) on both sides centering on the circular sectional shape from the blocking wall 105 formed in the central region PC of the unit jig 100 to the contact surface S. Since the contact surface S is formed at the inner wall of the receiving groove 102, a portion of the cooling member 20 (more specifically, the elastic piece T) slidably assembled through the receiving groove 102 may be naturally guided to the contact surface S.

Fig. 6 shows a perspective view of the cooling element shown in fig. 4.

Referring to fig. 4 and 6 together, the cooling part 20 may include: a main body portion B extending in parallel in the longitudinal direction of the battery cell 10; and an elastic piece T which is branched and extended from the main body part B. The body part B may be formed in an elongated shape extending in the length direction of the battery cell 10, and may include heat absorbing parts and heat dissipating parts formed at one end 20a side and the other end 20B side, respectively. Here, the heat absorbing part and the heat dissipating part being formed at the one end 20a side and the other end 20B side of the body part B may mean that regions of the heat absorbing part and the heat dissipating part are not limited to the one end and the other end according to the design of a specific cooling member 20, but may be formed at a region near the one end and a region near the other end, respectively, and may be used as a meaning of defining opposite regions of the heat absorbing part and the heat dissipating part. In one embodiment of the present invention, the cooling member 20 may include a heat pipe that can rapidly transfer a large amount of heat by the working fluid reciprocating between the heat absorbing part at the one end 20a side and the heat dissipating part at the other end 20b side with the phase change.

The main body B is a portion substantially responsible for heat dissipation of the battery cell 10, and absorbs heat from the battery cell 10 in the form of vaporization heat according to the phase change of the working fluid and releases the heat to the outside in the form of condensation heat, so that heat can be transmitted between the heat absorbing portion on the one end 20a side and the heat dissipating portion on the other end 20B side in the longitudinal direction of the main body B.

The heat sink may be disposed at the central region PC of the battery cell 10. The cooling member 20 may be elastically biased toward the blocking wall 105 to be positionally aligned with respect to the blocking wall 105, and more specifically, the heat sink portion formed at the one end 20a side of the cooling member 20 may be aligned with the central region PC of the battery cell 10 through the blocking wall 105. Since the cooling member 20 is assembled such that the heat sink portion at the one end 20a side thereof is elastically pressed toward the blocking wall 105, the correct position of the heat sink portion may be defined by the blocking wall 105, and the heat sink portion may effectively cool the battery cell 10 in the central region PC of the battery cell 10 without departing from the correct position as long as the region of the blocking wall 105 is maintained. The heat absorbing part may be spaced apart from the external atmosphere in the longitudinal direction of the battery cell 10 so that heat is absorbed at the central region PC of the battery cell 10 where heat release is restricted, and the heat absorbed through the heat absorbing part may be released to the external atmosphere through the heat releasing part at the other end 20b side of the cooling member 20 adjacent to the external atmosphere.

A buffer member 31 may be formed at an outer circumference of the heat absorbing part. The buffer member 31 may be formed to surround the outer circumference of the heat absorbing part, so that it may play a role of reducing thermal resistance between the heat absorbing part and the inner wall of the receiving groove 102 (or the inner wall of the unit holder 100). For example, the buffer member 31 may remove a gap between the heat absorbing part and the inner wall of the receiving groove 102 (or the inner wall of the unit holder 100) to prevent an air layer from existing between the heat absorbing part and the inner wall of the receiving groove 102 (or the inner wall of the unit holder 100), and closely attach the heat absorbing part to the unit holder 100, thereby reducing thermal resistance on a heat transfer path from the battery cell 10 to the heat absorbing part via the unit holder 100, and rapidly transferring heat of the battery cell 10 to the heat absorbing part. For example, the buffer member 31 may be formed in a pipe shape to sufficiently surround the heat absorbing part in a length direction of the cooling member 20 while surrounding the outer circumference of the heat absorbing part, and may be formed of, for example, a rubber pipe. Here, the buffer member 31 is formed to surround the heat sink portion may mean that the buffer member 31 is formed to surround at least a portion of the heat sink portion. In another embodiment of the present invention, the buffer member 31 may be formed in a region close to the heat absorbing part, that is, in a region relatively close to the one end 20a side of the cooling member 20, in order to be thermally connected to the heat absorbing part.

The heat dissipation parts may be disposed at both end regions PE of the battery cell 10. Since the heat absorbing part of the cooling member 20 at the one end 20a side is aligned with the central region PC of the battery cell 10, the heat dissipating part of the cooling member 20 at the other end 20b side may be disposed at both end regions PE of the battery cell 10. In one embodiment of the present invention, the heat dissipation portions may be disposed at both end regions PE of the unit jig 100, and at least a part of the heat dissipation portions may be exposed to the outside from the unit jig 100. The heat dissipation part is a position for dissipating heat transferred from the battery cell 10 to the outside atmosphere, and the outside can dissipate heat more effectively than the inside of the cell holder 100. However, since the overall size of the battery pack may increase by the length of the heat dissipation part exposed to the outside of the unit holder 100, and thus there is a problem in that the energy density is lowered compared to the size of the battery pack, the exposed length may be adjusted in consideration of the size of the battery pack when a portion of the heat dissipation part is exposed from the unit holder 100.

In one embodiment of the present invention, the heat radiating portion may be formed in a region close to the other end of the cooling member 20 opposite to the heat absorbing portion on the one end 20a side, and a sealing member 32 may be formed at the other end of the cooling member 20 so as to surround the cooling member 20. The sealing member 32 may block a path through which moisture or external impurities permeate through a gap between the cooling member 20 and the assembly opening 103, so that moisture or external impurities cannot permeate through the gap. For example, the sealing member 32 may be arranged in a pipe shape extending in a predetermined length in a length direction of the cooling member 20 while surrounding the cooling member 20, and for example, may be arranged using a rubber pipe.

The elastic sheet T may include: a connecting part TC connected to the body part B; and a contact portion TS extending from the connection portion TC to form an extended end portion. The elastic piece T may be formed in a plate spring form including a connection part TC at one end and a contact part TS at the other end, and may be assembled in an elastically compressed state to provide an elastic restoring force. Also, the elastic piece T may extend in a direction branching from the main body portion B, and may be elastically biased toward an outer side direction away from the main body portion B.

The contact portion TS may be pressed into contact with the contact surface S of the unit holder 100, thereby providing the blocking wall 105 with an elastic force having a tendency to push out the body portion B. For example, the contact portion TS may contact the contact surface S of the unit clamp 100, and may contact between the innermost end SI and the outermost end SO of the contact surface S.

The connection portion TC may provide a resilient hinge to resiliently bias the contact portion TS of the opposite side toward the outermost end SO of the contact surface S. For example, since the connecting portion TC elastically biases the contact portion TS on the opposite side toward the outermost end portion SO of the contact surface S, even in the case where the effective length (i.e., the shortest distance between the connecting portion TC at one end and the contact portion TS at the other end) determining the elastic force of the elastic piece T is shortened due to deformation of the elastic piece T or abrasion of the elastic piece T, or the like, the pressing contact between the contact portion TS and the contact surface S can be maintained, and the case where the cooling member 20 moves due to the weakening of the elastic force of the elastic piece T can be prevented, and the cooling member 20 can be fixed at the correct position.

The connecting portion TC and the contact portion TS may form one end portion and the other end portion of the elastic sheet T, respectively, the connecting portion TC may form one end portion near the central area PC of the unit holder 100, and the contact portion TS may form the other end portion near the both end areas PE of the unit holder 100. The elastic piece T may have a spatial gradient from the connection part TC near the center region PC toward the contact part TS near the both end regions PE, and may form an inclination toward the outside from the connection part TC toward the contact part TS. For example, the elastic piece T including the connecting portion TC at one end and the contact portion TS at the other end may extend in an oblique line direction while branching from the main body portion B at a predetermined inclination angle with respect to the main body portion B. In one aspect of the present invention, the elastic sheet T and the contact surface S, which are brought into pressure contact with each other, may have gradients or inclinations in opposite directions to each other, and the pressure contact with the contact surface S may be maintained by elastic hinge of the elastic sheet T.

The elastic pieces T may be formed in pairs at positions opposite to each other of the body portion B, and may be pressed into contact with contact surfaces S formed in pairs on the inner wall of the housing groove 102. The pair of elastic pieces T may press the pair of contact surfaces S formed at the inner wall of the receiving groove 102 in a direction away from each other. With regard to the assembly of the cooling member 20, when the cooling member 20 is assembled by sliding from the assembly opening 103 toward the blocking wall 105, since the pair of elastic pieces T in the cooling member 20 are elastically biased in the direction away from each other, the pair of elastic pieces T can be brought into pressing contact with the contact surface S, and since the cooling member 20 pressed by the elastic pieces T is blocked from further sliding movement by the blocking wall 105, a stable fixing position can be achieved.

The elastic piece T may be disposed between the heat absorbing part at one end 20a side and the heat dissipating part at the other end 20B side in the length direction of the body B. If the elastic sheet T is formed at the side of the one end 20a where the heat absorbing part is formed, since the elastic sheet T is disposed in the heat transfer path between the heat absorbing part and the unit holder 100, the flow of heat from the battery cell 10 to the heat absorbing part may be impeded, and the assembly of the buffer member 31 around the outer circumference of the heat absorbing part may be impeded. Also, if the elastic piece T is formed at the other end 20b side where the heat dissipation portion is formed, the elastic force transmitted through the elastic piece T may not be effectively transmitted to the one end 20a side of the cooling member 20, and it may become difficult to press the one end 20a side of the cooling member 20 against the blocking wall 105.

In one embodiment of the present invention, by making the elastic sheet T and the contact surface S, which are brought into pressure contact with each other, have gradients or inclinations in directions opposite to each other, elastic pressure contact between the elastic sheet T and the contact surface S can be maintained even if there is a temporal change that may cause a decrease in elastic force, such as deformation of the elastic sheet T, abrasion of the elastic sheet T or the contact surface S, or the like. For example, the angle between the elastic piece T and the main body portion B may be increased or conversely decreased by the elastic hinge of the connecting portion TC of the cooling member 20 connecting the elastic piece T and the main body portion B, so that the elastic force of the elastic piece T may be appropriately maintained in a manner adapted to the temporal change, and thus the position of the cooling member 20 elastically biased toward the blocking wall 105 by the elastic piece T may be firmly fixed.

In the present invention, the position of the cooling member 20 is fixed based on the elastic pressing contact of the elastic pieces T and the contact surfaces S having gradients in opposite directions or inclinations, and since the cooling member 20 and the unit clamp 100 are engaged with each other by the elastic biasing, the weakening of the coupling force due to the physical abrasion does not occur, and the problem of the reduction of the heat dissipation efficiency due to the movement or the deviation of the position of the cooling member 20 from the correct position due to the weakening of the coupling force is not caused. In contrast to this, a fastening manner such as screw fastening or clip fastening, which fixes the position of the cooling member 20 by directly restraining the cooling member 20 using a separate fastening member, cannot avoid weakening of the coupling force due to friction and abrasion over time caused by the direct restraint, and as the coupling force is weakened, the position of the cooling member 20 may move and a problem of falling off the correct position to cause a drop in the heat dissipation efficiency of the battery cell 10 may be caused.

Fig. 7 shows another battery pack according to another embodiment of the present invention.

As shown in fig. 1 and 2, the battery pack shown in fig. 7 may further include a cover 200 for receiving the cell holder 100 assembled with the battery cell 10 and the cooling member 20. More specifically, the cover 200 may include a first cover 210 and a second cover 220, the first cover 210 and the second cover 220 interposing the unit jig 100 assembled with the battery unit 10 and the cooling member 20 therebetween and being coupled in a direction facing each other.

While the utility model has been described with reference to the embodiments shown in the drawings, which are exemplary only, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof.

Possibility of industrial utilization

The present invention can be applied to a battery pack as a chargeable and dischargeable energy source and various devices using the battery pack as a driving power source.

Claims

1. A battery pack, comprising:

a battery cell;

a cooling member having a heat absorbing part disposed at a central region in a length direction of the battery cell and heat dissipating parts disposed at both end regions in the length direction of the battery cell; and

and a unit holder that accommodates the battery unit and the cooling member, wherein a contact surface that is elastically pressed against the cooling member is formed on one side of the unit holder.

2. The battery pack according to claim 1,

the unit jig includes:

a battery housing portion for housing the battery unit; and

A receiving groove for receiving the cooling member,

wherein the receiving groove is formed in a valley region between the battery receiving parts adjacent to each other in the outer circumference.

3. The battery pack according to claim 2,

the unit jig includes:

a first jig, a second jig coupled to face each other in a length direction of the battery cell,

wherein the battery receiving parts respectively formed at the first jig and the second jig are spatially connected to each other to receive the same battery cell,

the receiving grooves formed in the first jig and the second jig are spatially separated from each other to receive different cooling members.

4. The battery pack according to claim 3,

the receiving groove is formed by a space between a blocking wall formed at a central region of the unit holder in a length direction of the battery cell and assembly openings formed at both end regions of the unit holder in the length direction of the battery cell.

5. The battery pack according to claim 4,

the first jig and the second jig are disposed facing each other in such a manner that blocking walls are adjacent to each other.

6. The battery pack according to claim 4,

The cooling member is resiliently biased toward the blocking wall.

7. The battery pack according to claim 2,

the contact surface is formed on an inner wall of the housing groove between both end regions and a middle region of the unit holder.

8. The battery pack according to claim 7,

the contact surface has a spatial gradient between an innermost end of the two end regions near the unit clamp and an outermost end near the central region.

9. The battery pack according to claim 8,

the contact surface includes an inclined surface inclined outward from the innermost end to the outermost end.

10. The battery pack according to claim 2,

the contact surfaces are formed in pairs on both sides of the receiving groove.

11. The battery pack according to claim 1,

the cooling part includes:

a main body portion including the heat absorbing portion and the heat dissipating portion on one end side and the other end side in a longitudinal direction; and

and an elastic piece extending so as to be branched from the main body portion.

12. The battery pack according to claim 11,

the heat absorbing part is disposed inside the unit clamp,

At least a portion of the heat dissipation part is exposed to the outside of the unit jig.

13. The battery pack according to claim 11,

a buffer member extending in a lengthwise direction of the battery cell while surrounding the heat absorbing part is formed at an outer circumference of the heat absorbing part.

14. The battery pack according to claim 11,

the elastic piece is elastically biased to the outside in a manner of being away from the main body portion.

15. The battery pack according to claim 11,

the elastic piece comprises a connecting part formed at one end and a contact part formed at the other end, the connecting part is connected with the main body part, and the contact part elastically pressurizes the contact surface and is in contact with the contact surface.

16. The battery pack according to claim 15,

the contact face has a spatial gradient between an innermost end of the two end regions near the unit clamp and an outermost end near the central region,

the connecting portion provides a resilient hinge to resiliently bias the contact portion on the opposite side towards the outermost end of the contact face.

17. The battery pack according to claim 15,

the elastic piece has a spatial gradient from the connecting portion near the center region of the unit clamp toward the contact portion near the both end regions.

18. The battery pack according to claim 17,

the elastic piece has an outward inclination from the connecting portion to the contact portion.

19. The battery pack according to claim 17,

the elastic piece and the contact surface are in pressure contact with each other and have gradients or inclinations in opposite directions to each other.