Battery pack

Abstract

To provide a battery pack.SOLUTION: A battery pack contains: a plurality of battery cells; and a main body of a sensor substrate, that is a sensor substrate for collecting state information from the plurality of battery cells that contains a branch part that is connected between the main body of the sensor substrate while bypassing the sensor substrate so as to mediate a first deformation housing space, and an annular part that is connected onto the branch part and forms a second deformation housing space. Thus, the present invention provides the battery pack containing the sensor substrate that can flexibly track a position movement of a bus bar generated in accordance with a volume expansion like swelling of a battery cell generated in a charging and discharging of the battery cell via the sensor substrate providing a deformation housing space so that one part of the sensor substrate for obtaining the state information of the battery cell is flexibly deformed, and prevents an accumulation of an internal stress due to the position movement of the bus bar and a damage due to the accumulation of them.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a battery pack. [Background technology]

[0002] Generally, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, etc., and are used in the form of a single battery or in the form of a module in which multiple batteries are connected together to form a single unit, depending on the type of external device to which they are applied.

[0003] Small mobile devices such as mobile phones can operate for a certain period of time with the output and capacity of a single battery, but when long-term operation and high power operation are required, such as in power-hungry electric and hybrid vehicles, a modular form containing multiple batteries is preferred due to issues of output and capacity, and the output voltage and output current are increased depending on the number of built-in batteries. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a battery pack including a sensing substrate that can flexibly follow a positional movement of a busbar caused by volumetric expansion such as swelling of a battery cell during charging and discharging of the battery cell, via a sensing substrate that provides a deformable accommodation space so that a portion of the sensing substrate for obtaining state information of the battery cell can flexibly deform, and that can prevent accumulation of internal stress due to the positional movement of the busbar and damage caused thereby. [Means for solving the problem]

[0005] In order to solve the above problems and other problems, a battery pack of the present invention includes: a plurality of battery cells; and a sensing substrate for collecting status information from the plurality of battery cells, the sensing substrate including: a main body of the sensing substrate; a branch portion connected around the sensing substrate to interpose a first deformable accommodating space between the main body of the sensing substrate and the branch portion; and a ring portion connected onto the branch portion to form a second deformable accommodating space.

[0006] For example, the branch portion, together with the body of the sensing board, may surround the first deformable accommodation space, and the ring portion may completely surround the second deformable accommodation space.

[0007] For example, the first and second deformable receiving spaces may be formed in a shape that is closed from the outside.

[0008] For example, the first deformation accommodation space extends along the first direction between the branch portion and the main body of the sensing board, the branch portion extending side by side along the first direction.

[0009] For example, the first deformable receiving space may be closed by a first support portion connected to the body of the sensing board at both ends in a first direction.

[0010] For example, the first support portion may have rounded branches extending in parallel along a first direction and connect the branches to the body of the sensing board.

[0011] For example, the ring portion may extend in a circular closed loop shape and surround the circular second deformation accommodation space.

[0012] For example, the ring may be connected to branches extending on both sides of the ring and to the main body of the sensing board via three second supports formed along the periphery of the ring.

[0013] For example, among the second support parts, the second support part connecting the ring portion and the main body of the sensing board may divide a first deformable accommodation space formed between the branch portion on which the ring portion is formed and the main body of the sensing board into two.

[0014] For example, a connection portion to be connected to the battery cell may be formed on the branch portion.

[0015] For example, the connection positions include first and second connection positions disposed on both sides of the ring portion.

[0016] For example, the first and second connection positions may be disposed along a first direction in which the plurality of battery cells are arranged.

[0017] For example, the first and second connection positions may be connected to first and second bus bars arranged adjacent to each other along a first direction, or to first and second connection parts adjacent to each other along the first direction so as to be connected to the first and second bus bars.

[0018] For example, first and second connection parts connected to the first and second bus bars may be connected to the first and second connection positions.

[0019] For example, the first and second bus bars may connect different battery cells.

[0020] For example, the ring portion may be connected to a branch portion in which the first connection position is formed and a branch portion in which the second connection position is formed via second support portions formed on both sides of the ring portion.

[0021] For example, a first support portion at one end position that closes the first deformable accommodating space may be formed on the opposite side of the ring portion relative to the first connecting position, and a first support portion at the other end position that closes the first deformable accommodating space may be formed on the opposite side of the ring portion relative to the second connecting position.

[0022] For example, the first and second connecting positions may be formed at an inner position adjacent to the ring portion, and a first support portion at the one end position and a first support portion at the other end position may be formed at an outer position relatively far from the ring portion. Effect of the Invention

[0023] According to the present invention, there is provided a battery pack including a sensing substrate for obtaining status information of a battery cell, the sensing substrate providing a deformable accommodation space so that a portion of the sensing substrate can flexibly deform, thereby flexibly tracking positional movement of a busbar caused by volumetric expansion such as swelling of a battery cell during charging and discharging of the battery cell, and preventing accumulation of internal stress due to the positional movement of the busbar and resulting damage. [Brief description of the drawings]

[0024] [Figure 1] 1 is an exploded perspective view of a battery pack according to an embodiment of the present invention; FIG. [Diagram 2] FIG. 2 is an exploded perspective view showing a portion of the battery pack shown in FIG. 1. [Diagram 3] 2 is a diagram showing a sensing structure for collecting state information of a battery cell, which is a part of the battery pack shown in FIG. 1 and includes a sensing substrate and a connection part connected to the sensing substrate. [Figure 4] 4 is a view showing an example of a part of the battery pack shown in FIG. 3, including first and second pin members sandwiched between first and second deformable receiving spaces for temporarily fixing a sensing board; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a battery pack according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

[0026] FIG. 1 is an exploded perspective view of a battery pack according to one embodiment of the present invention.

[0027] FIG. 2 is an exploded perspective view showing a portion of the battery pack shown in FIG.

[0028] FIG. 3 is a diagram illustrating a sensing structure, which is a part of the battery pack shown in FIG. 1, including a sensing substrate and a connector connected to the sensing substrate, for collecting status information of a battery cell.

[0029] FIG. 4 is a view illustrating an example of a part of the battery pack illustrated in FIG. 3, including first and second pin members sandwiched between first and second deformable receiving spaces for temporarily fixing a sensing board.

[0030] 1 to 4, a battery pack according to an embodiment of the present invention includes a plurality of battery cells 10, and a sensing substrate 100 for collecting status information from the plurality of battery cells 10, the sensing substrate 100 including a main body 101 of the sensing substrate 100, a branch portion B of the sensing substrate 100 connected around the sensing substrate 100 to interpose a first deformable accommodating space G1 between the main body 101 of the sensing substrate 100, and a ring portion R connected onto the branch portion B to form a second deformable accommodating space G2.

[0031] In an embodiment of the present invention, the sensing substrate 100 extends across the terminal surfaces 13 of the battery cells 10 arranged along a first direction Z1, and first and second electrode terminals 11, 12 of different polarities arranged along a second direction Z2 intersecting the first direction Z1 are formed on the terminal surfaces 13 of the battery cells 10, and the first and second electrode terminals 11, 12 may be formed as first and second row electrode terminals 11, 12 on both sides of the second direction Z2 along the battery cells 10 arranged along the first direction Z1. In this case, the first and second row bus bars 15 that connect the first and second electrode terminals 11, 12 of the different battery cells 10 and electrically connect the different battery cells 10 may also be formed as first and second row bus bars 15 on both sides of the second direction Z2 along the battery cells 10 arranged along the first direction Z1 to electrically connect the first and second electrode terminals 11, 12 of the different battery cells 10.

[0032] 1, in an embodiment of the present invention, the busbar 15 includes connection pieces 15a formed at both ends of the busbar 15 and connected to electrode terminals 11, 12 of different battery cells 10, and a connecting piece 15c formed at a central position of the busbar 15 and connecting the connection pieces 15a on both sides connected to the electrode terminals 11, 12 of different battery cells 10, and the connecting piece 15c is formed in a bent shape from the connection pieces 15a formed at both ends of the busbar 15 to elastically deformably connect the connection pieces 15a formed at both ends. As will be described later, in an embodiment of the present invention, a first connection region 51 of a connection part 50 may be connected to the connecting piece 15c of the busbar 15.

[0033] Throughout the present specification, the body 101 of the sensing board 100 refers to a main part of the sensing board 100 arranged at an inner position from the branch B along the second direction Z2, except for the branch B branched out from the body 101 of the sensing board 100 to an outer position from the body 101 of the sensing board 100 to approach the first and second rows of bus bars 15 across the first deformable accommodating space G1, and may occupy most of the area of ​​the sensing board 100. For example, in one embodiment of the present invention, the sensing board 100 includes the body 101 of the sensing board 100 extending across the terminal surfaces 13 of the battery cells 10 arranged along the first direction Z1 at a relatively inner position along the second direction Z2, and the branch B arranged at a relatively outer position along the second direction Z2 across the first deformable accommodating space G1 to approach the first and second rows of bus bars 15 from the body 101 of the sensing board 100. The branch parts B may be disposed at relatively outer positions separated across the first deformable receiving space G1 from the body 101 of the sensing board 100 disposed at a relatively inner position toward the first and second row bus bars 15. Throughout this specification, the inner position may mean a direction in which the first and second electrode terminals 11 and 12 of different polarities disposed along the second direction Z2 face each other, or a relative position along the direction in which they face each other, and the outer position may mean a direction in which the first and second electrode terminals 11 and 12 of different polarities disposed along the second direction Z2 face each other, or a relative position along the direction in which they face each other.

[0034] In an embodiment of the present invention, the status information of the battery cell 10 includes status information such as the temperature, voltage, and current of the battery cell 10, and the status information collected from the battery cell 10 is also transmitted to a battery management unit (not shown) connected to one end of the sensing substrate 100 through the sensing substrate 100. In an embodiment of the present invention, the status information of the battery cell 10 can be obtained through the bus bar 15 that forms thermal and electrical connections with the first and second electrode terminals 11 and 12 of the battery cell 10, for example, through a connection unit 50 connected to the bus bar 15. For example, the temperature information of the battery cell 10 can be obtained through the bus bar 15 that is thermally connected to the first and second electrode terminals 11 and 12 of the battery cell 10, and the voltage information of the battery cell 10 can be obtained through the bus bar 15 that is electrically connected to the first and second electrode terminals 11 and 12 of the battery cell 10. In one embodiment of the present invention, an electrical signal related to status information of the battery cell 10, including temperature information and / or voltage information of the battery cell 10, is generated through the connection part 50 connected to the bus bar 15, and the generated electrical signal is also transmitted to the sensing substrate 100. In one embodiment of the present invention, the sensing substrate 100 can be connected to the bus bar 15 connected to the terminal surface 13 of the battery cell 10 in order to collect status information of the battery cell 10, and in various embodiments of the present invention, the sensing substrate 100 can be directly connected to the terminal surface 13 of the battery cell 10. That is, in various embodiments of the present invention, the fact that the sensing substrate 100 is connected to the side of the battery cell 10 in order to obtain status information of the battery cell 10 comprehensively means that the sensing substrate 100 is directly connected to the battery cell 10 itself, such as the terminal surface 13 of the battery cell 10, or is connected to the bus bar 15 connected to the battery cell 10.

[0035] In an embodiment of the present invention, the sensing substrate 100 also includes a body 101 of the sensing substrate 100 and a branch portion B connected to each battery cell 10 side (e.g., a bus bar 15) from the body 101 of the sensing substrate 100. The sensing substrate 100 including the body 101 of the sensing substrate 100 and the branch portion B of the sensing substrate 100 is generally disposed between the first and second rows of bus bars 15, for example, at an inner position between the first and second rows of bus bars 15 along a second direction Z2 intersecting the first direction Z1.

[0036] In one embodiment of the present invention, a connection part 50 is interposed between the bus bar 15 and the sensing substrate 100, and the connection part 50 mediates the transmission of status information of the battery cell 10 between the bus bar 15 and the sensing substrate 100. In one embodiment of the present invention, the connection part 50 not only transmits the status information of the battery cell 10, but also generates an electrical signal related to the status information of the battery cell 10 and transmits the generated status information of the battery cell 10 to the sensing substrate 100.

[0037] In an embodiment of the present invention, the connection part 50 includes a first connection region 51 thermally and / or electrically connected to the bus bar 15 and a second connection region 52 electrically connected to the sensing substrate 100, and includes a sensing element 55 for mediating transmission of state information of the battery cell 10 between the bus bar 15 and the sensing substrate 100 and generating state information such as temperature or voltage as the state information of the battery cell 10 transmitted via the first connection region 51 as an electrical signal. However, in an embodiment of the present invention, the sensing element 55 may be formed in the second connection region 52 connected to the sensing substrate 100 out of the first connection region 51 connected to the bus bar 15 and the second connection region 52 connected to the sensing substrate 100.

[0038] In various embodiments of the present invention, the first connection region 51 may transmit temperature information of the busbar 15 to the sensing element 55 of the second connection region 52 while forming a thermal connection with the busbar 15, and may transmit voltage information of the busbar 15 to the sensing element 55 of the second connection region 52 while forming an electrical connection with the busbar 15 in the first connection region 51. Furthermore, status information of the battery cell 10 generated from the sensing element 55 is also transmitted to the body 101 of the sensing substrate 100 via the second connection region 52.

[0039] In one embodiment of the present invention, the first connection region 51 includes a metal terminal, and in a specific embodiment, the first connection region 51 is also formed of a metal terminal including a nickel plate having excellent thermal and electrical conductivity properties. The first connection region 51 is connected onto the bus bar 15 via a welded joint W with the bus bar 15, and in one embodiment of the present invention, the first connection region 51 and the bus bar 15 may be connected to each other by laser welding.

[0040] In one embodiment of the present invention, the second connection region 52 may be provided as a one-sided circuit board or a double-sided circuit board, and in one embodiment of the present invention, the second connection region 52 may be provided as a double-sided circuit board, with the sensing element 55 connected to one side and the sensing substrate 100 connected to the other side. At this time, the second connection region 52 and the sensing element 55, and the second connection region 52 and the sensing substrate 100 may be electrically connected to each other through soldering. In one embodiment of the present invention, the second connection region 52 is a portion of a connection part 50 that mediates connection with the sensor substrate 100, and refers to a region formed in the connection part 50, and also corresponds to connection positions P1 and P2 formed in the sensor substrate 100 as described below. In one embodiment of the present invention, the connection between the connection part 50 and the sensor substrate 100 is performed via a connection between the second connection region 52 of the connection part 50 and the connection positions P1 and P2 of the sensor substrate 100. Thus, the second connection region 52 of the connection part 50 between the connection part 50 and the sensor substrate 100 can be understood to be the same position as the connection positions P1 and P2 of the sensor substrate 100. More specifically, the second connection region 52 refers to one component of the connection part 50, and the connection positions P1 and P2 refer to one component of the sensor substrate 100. As described below, in one embodiment of the present invention, the connection portion 50 includes first and second connection portions 501, 502 connected to adjacent first and second bus bars 151, 152 along the first direction Z1, and similarly, the connection positions P1, P2 include first and second connection positions P1, P2 connected to adjacent first and second bus bars 151, 152 along the first direction Z1, and the first and second connection portions 50 (more specifically, the second connection regions 52 of the first and second connection portions 501, 502) adjacent to each other along the first direction Z1 and the first and second connection positions P1, P2 may be formed at substantially the same positions on the plane formed by the first and second directions Z1, Z2 while being connected to each other at corresponding positions.

[0041] Hereinafter, a configuration of the sensing substrate 100 for collecting the status information of the battery cells 10 will be described in more detail. The sensing substrate 100 includes a body 101 of the sensing substrate 100 and a branch portion B connected to the body 101 of the sensing substrate 100 by bypassing the body 101 of the sensing substrate 100 to approach the bus bar 15 with a first deformable receiving space G1 interposed between the body 101 of the sensing substrate 100 and the bus bar 15. The branch portion B may extend generally in parallel with the body 101 of the sensing substrate 100 along a first direction Z1, and may be disposed at a position offset from the body 101 of the sensing substrate 100 toward the bus bar 15 along a second direction Z2 intersecting the first direction Z1 in which the plurality of battery cells 10 are arranged. The branch portion B extends generally in the first direction Z1, and a first support portion S1 connected to the body 101 of the sensing substrate 100 may be formed at both ends of the branch portion B extending along the first direction Z1. In one embodiment of the present invention, the branch portion B may provide connection positions P1, P2 with the connection portion 50 between the first support portions S1 at both ends, and a closed-loop-shaped ring portion R surrounding the second deformable accommodating space G2 may be formed on the branch portion B together with the connection positions P1, P2 with the connection portion 50 so that the branch portion B providing the connection positions P1, P2 with the connection portion 50 can flexibly follow the displacement of the bus bar 15 or the connection portion 50 connected to the bus bar 15 that occurs due to swelling of the battery cell 10.

[0042] In one embodiment of the present invention, the connection positions P1 and P2 of the connection part 50 refer to positions at which the connection part 50 connecting the battery cell 10 side and the sensing substrate 100 is connected on the sensing substrate 100, and in one embodiment of the present invention, the connection positions P1 and P2 of the connection part 50 include first and second connection positions P1 and P2 at which different first and second connection parts 501 and 502 are connected along the first direction Z1. For example, in an embodiment of the present invention, the first and second connection positions P1 and P2 are positions where adjacent first and second bus bars 151 and 152 are connected to each other via first and second connection parts 501 and 502, and the first and second connection positions P1 and P2 mean positions where adjacent first and second connection parts 501 and 502 are connected to the sensor board 100 along the first direction Z1, and the first and second connection positions P1 and P2 mean positions where adjacent first and second bus bars 151 and 152 are connected to the sensor board 100 along the first direction Z1 via the first and second connection parts 501 and 502, and in this sense, the first and second connection positions P1 and P2 mean positions where adjacent first and second connection parts 501 and 502 are connected to each other along the first direction Z1, or positions where adjacent first and second bus bars 151 and 152 are connected to each other along the first direction Z1. As described later, a ring portion R surrounding a second deformation accommodation space G2 may be interposed between the first and second connecting positions P1, P2 arranged adjacent to each other along the first direction Z1 to allow relative deformation or displacement between the first and second connecting positions P1, P2.

[0043] The first deformable accommodating space G1 is formed between the main body 101 and the branch B of the sensing substrate 100 along a second direction Z2 intersecting with the first direction Z1 in which the battery cells 10 are arranged, and the second deformable accommodating space G2 is formed between the first and second connecting positions P1 and P2 adjacent to each other on the branch B extending along the first direction Z1. In an embodiment of the present invention, both the first and second deformable accommodating spaces G1 and G2 are surrounded by the sensing substrate 100 and are also formed by the configuration of the sensing substrate 100 surrounding the first and second deformable accommodating spaces G1 and G2. For example, the first deformable accommodating space G1 is surrounded by the branch B of the sensing substrate 100, more specifically, by the branch B and the main body 101 of the sensing substrate 100, and the second deformable accommodating space G2 is surrounded by the ring portion R of the sensing substrate 100. In an embodiment of the present invention, the first and second deformable accommodating spaces G1 and G2 may be formed in a shape closed from the outside, for example, the first deformable accommodating space G1 may be surrounded by the branch B and the body 101 of the sensing substrate 100 and may be formed in a shape closed from the outside, and the second deformable accommodating space G2 may be surrounded by the ring R and may be formed in a shape closed from the outside. For example, when the branch B surrounds the first deformable accommodating space G1, the branch B may surround a part of the first deformable accommodating space G1, and when the ring R surrounds the second deformable accommodating space G2, the ring R may completely or entirely surround the second deformable accommodating space G2.

[0044] In one embodiment of the present invention, relative displacement of the connection positions P1, P2 connected to the busbar 15 or the connection portion 50 can be permitted to accommodate displacement of the busbar 15 caused by swelling of the battery cell 10 or displacement of the connection portion 50 connected to the busbar 15. To this end, first and second deformable accommodating spaces G1, G2 can be formed adjacent to the connection positions P1, P2 through the shape design of the branch portion B and the ring portion R connected to the connection positions P1, P2. The first and second deformation accommodating spaces G1, G2 accommodate deformations of the branch portion B and the ring portion R while allowing the branch portion B and the ring portion R to flexibly deform in accordance with the displacement of the connecting positions P1, P2. For example, the first and second deformation accommodating spaces G1, G2 can accommodate deformations such as distortions of the branch portion B and the ring portion R, induce deformations of the branch portion B and the ring portion R, and allow flexible deformation or displacement of the connecting positions P1, P2 via the first and second deformation accommodating spaces G1, G2.

[0045] In one embodiment of the present invention, the first and second deformable accommodating spaces G1 and G2 are surrounded by the sensing substrate 100 and are formed in a form closed from the outside, thereby preventing the sensing substrate 100 from twisting or fluttering, or from floating above the plane on which the sensing substrate 100 is placed, and maintaining the co-planarity of the sensing substrate 100. If the first and second deformable accommodating spaces G1, G2 are formed in a form that is open toward the outside, unlike the present invention, a part of the sensing substrate 100 surrounding the first and second deformable accommodating spaces G1, G2 (e.g., the branch portion B forming the first deformable accommodating space G1, or the ring portion R forming the second deformable accommodating space G2, particularly the ends of the branch portion B and the ring portion R that open the first and second deformable accommodating spaces G1, G2, etc.) cannot maintain coplanarity on the plane on which the sensing substrate 100 is arranged, and the connecting positions P1, P2 move excessively due to deformation such as twisting, fluttering, and floating, thereby reducing the workability of connecting to the connecting portion 50 at the connecting positions P1, P2.

[0046] In an embodiment of the present invention, the first deformable accommodating space G1 is also formed in a shape that extends long along the first direction Z1 in which the plurality of battery cells 10 are arranged, and extends long along the first direction Z1 between the branch B and the body 101 of the sensing substrate 100, which extend approximately side by side along the first direction Z1. For example, while the first deformable accommodating space G1 is distorted along the first direction Z1 in which the plurality of battery cells 10 are arranged, or along the first direction Z1 in which the swelling of the plurality of battery cells 10 is cumulatively expressed, the branch B forming the first deformable accommodating space G1 and the connection positions P1 and P2 connected to the branch B may be deformed or displaced along the first direction Z1. In an embodiment of the present invention, the first deformable accommodating space G1 extends long along the first direction Z1 between the branch B and the body 101 of the sensing substrate 100, and both end positions of the first deformable accommodating space G1 are also closed by the first support S1 that connects the branch B and the body 101 of the sensing substrate 100.

[0047] In various embodiments of the present invention, the first deformable accommodating space G1 may include one space formed between the branch B and the main body 101 of the sensing substrate 100, or may include a plurality of spaces divided into two or more between the branch B and the main body 101 of the sensing substrate 100. As described below, in one embodiment of the present invention, the first deformable accommodating space G1 is also divided into two different first deformable accommodating spaces G1 by a second support part S2 extending from a ring part R connected on the branch B to the main body 101 of the sensing substrate 100.

[0048] In one embodiment of the present invention, the second deformable accommodating space G2 is formed in a closed loop shape surrounded by the ring portion R connected on the branch portion B, and is formed in a circular closed loop shape according to the shape of the ring portion R. In one embodiment of the present invention, the ring portion R is formed in a circular closed loop shape, and thus flexibly deforms in response to thermal stress that can act in various directions including the first and second directions Z1 and Z2 due to thermal expansion of the battery cell 10, and does not have a specific directionality. However, in other embodiments of the present invention, the ring portion R can be formed in various polygonal shapes including an ellipse and a rectangle other than a circle, and may have anisotropy that shows different behaviors depending on the direction of thermal stress.

[0049] For example, the second deformable accommodating space G2 may be distorted along a first direction Z1 in which the plurality of battery cells 10 are arranged, or along the first direction Z1 in which swelling of the plurality of battery cells 10 is cumulatively expressed, and the ring portion R forming the second deformable accommodating space G2 and the connection positions P1, P2 connected to the ring portion R may be deformed or displaced along the first direction Z1. In one embodiment of the present invention, the ring portion R or the second deformable accommodating space G2 formed by the ring portion R is formed between first and second connection positions P1, P2 that are different from each other along the first direction Z1, and may elastically connect the first and second connection positions P1, P2 while allowing a relative displacement between the first and second connection positions P1, P2. The first and second connecting positions P1, P2 are respectively connected to the first and second bus bars 151, 152 adjacent to each other along the first direction Z1 (the first and second connecting parts 501, 502 connected to the first and second bus bars 151, 152 adjacent to each other along the first direction Z1), and the ring portion R or a second deformable accommodating space G2 formed by the ring portion R can flexibly connect the first and second connecting positions P1, P2 to which the first and second bus bars 151, 152 adjacent to each other along the first direction Z1 are connected. The first and second connecting positions P1, P2 are formed at different positions of the branch portion B extending along the first direction Z1, and include the first connecting positions P1, P2 formed between the first supporting portion S1 formed at one end of the branch portion B and the ring portion R, and the second connecting positions P1, P2 formed between the first supporting portion S1 formed at the other end of the branch portion B and the ring portion R.

[0050] In one embodiment of the present invention, the ring R forming the second deformable receiving space G2 may be supported by other components of the sensor board 100 through two or more second support parts S2 formed along the periphery of the ring R. For example, in one embodiment of the present invention, the ring R is also connected to the branch B through the second support parts S2 on both sides along the first direction Z1, and is also connected to the branch B at which the first and second connection positions P1 and P2 are formed. In one embodiment of the present invention, the ring R is also supported by the branch B of the sensor board 100 extending on both sides of the ring R along the first direction Z1 and the main body 101 of the sensor board 100 through three second support parts S2 formed along the periphery of the ring R. That is, more specifically, the ring R is connected to the branch B on both sides through the second support parts S2, and is also connected to the main body 101 of the sensor board 100 through the other second support parts S2. The second support part S2 connecting the ring part R and the main body 101 of the sensing substrate 100 can divide the first deformable accommodating space G1 formed between the branch part B on which the ring part R is formed and the main body 101 of the sensing substrate 100 into two. At this time, two first deformable accommodating spaces G1 divided by the second support part S2 can be formed between the branch part B and the main body 101 of the sensing substrate 100.

[0051] In one embodiment of the present invention, the sensor board 100 includes a body 101 of the sensor board 100 and a branch portion B spaced apart from the body 101 of the sensor board 100 at an outer position to interpose a first deformable accommodating space G1 therebetween. Throughout this specification, the branch portion B refers to a portion spaced apart from the body 101 of the sensor board 100 in whole or in part to interpose the first deformable accommodating space G1 therebetween. In this sense, the first support portion S1 may also be understood as connecting the branch portion B forming the first deformable accommodating space G1 to the body 101 of the sensor board 100, and the branch portion B may also be understood as including the first support portion S1. Thus, throughout this specification, the branch portion B generally or partially refers to a portion separated from the body 101 of the sensing substrate 100 with the first deformable accommodation space G1 interposed therebetween, and in this sense, the second support portion S2 may also be understood as connecting the ring portion R forming the second deformable accommodation space G2 to the branch portion B, and the branch portion B may also be understood as including the second support portion S2. In one embodiment of the present invention, the branch portion B includes a first support portion S1 formed at both ends of the first deformable accommodation space G1 along the first direction Z1, and includes a pair of second support portions S2 formed at both ends of the ring portion R surrounding the second deformable accommodation space G2 along the first direction Z1, and generally refers to a portion separated from the body 101 of the sensing substrate 100 with the first deformable accommodation space G1 interposed therebetween.

[0052] In one embodiment of the present invention, the first and second deformable accommodating spaces G1 and G2 may be formed in a shape that is closed from the outside, for example, they may be formed in a shape that is completely surrounded by a part of the sensing substrate 100 and closed from the outside, thereby preventing the connection positions P1 and P2 with the connection part 50 from moving arbitrarily, for example, the sensing substrate 100 may maintain coplanarity overall, and the connection between the bus bar 15 and the sensing substrate 100 using the connection part 50 may be easily performed.

[0053] In an embodiment of the present invention, the first and second deformable accommodating spaces G1 and G2, in a battery pack in which the connection with the bus bar 15 is completed, may allow deformation or displacement of the connection positions P1 and P2 connected to the bus bar 15 or the connecting parts 50, thereby allowing flexible deformation or displacement to accommodate swelling of the battery cells 10, and may contribute to the purpose of preventing damage to the sensing board 100 due to accumulation of internal stress by eliminating internal stress accumulated in the sensing board 100. However, in a battery pack in which the connection with the bus bar 15 is not completed, the first and second deformable accommodating spaces G1 and G2 may temporarily fix the sensing board 100 through the first and second deformable accommodating spaces G1 and G2 in consideration of workability for connection with the bus bar 15 and for the purpose of improving convenience in distribution or handling of the sensing board 100. Throughout this specification, provisionally fixing the sensing substrate 100 does not mean that the sensing substrate 100 is completely fixed in position, but rather that at least a portion of the sensing substrate 100, such as the branch portion B and the ring portion R, is fixed in position using, for example, pin members F1 and F2 which are parts of the sensing substrate 100 and are sandwiched between the branch portion B and the ring portion R.

[0054] Hereinafter, the structure for temporarily fixing the sensing board 100 through the first and second deformable accommodating spaces G1 and G2 will be described in more detail. For example, by temporarily fixing the sensing board 100 through the first and second deformable accommodating spaces G1 and G2, the workability for connecting the bus bar 15 can be improved. More specifically, the first and second deformable accommodating spaces G1 and G2 can contribute to the purpose of preventing the movement of the connecting portion 50 at the connecting positions P1 and P2 and stably connecting the bus bar 15. For example, pin members F1 and F2 for temporarily fixing the branch portion B and the ring portion R forming the first and second deformable accommodating spaces G1 and G2 can be sandwiched in at least a part of the first and second deformable accommodating spaces G1 and G2. For example, in one embodiment of the present invention, pin members F1 and F2 can be sandwiched in a part of the first and second deformable accommodating spaces G1 and G2, that is, in both end positions of the first deformable accommodating space G1 and the second deformable accommodating space G2.

[0055] In one embodiment of the present invention, for the convenience of connection with the bus bar 15 and / or distribution or handling of the sensing board 100, pin members F1 and F2 are sandwiched in at least a part of the first and second deformable accommodating spaces G1 and G2, and first pin members F1 are sandwiched in first support parts S1 formed at both ends of the first deformable accommodating space G1, more specifically, at both ends of the first deformable accommodating space G1, respectively, and in consideration of the connection with the first pin members F1, for example, in consideration of the contact area with the first pin members F1 having a circular cross section, the first support parts S1 are formed in a rounded shape. That is, the first support parts S1 can connect the branch parts B extending in parallel along the first direction Z1 with a rounded shape to the main body 101 of the sensing board 100. Meanwhile, the second deformable accommodating space G2 is sandwiched in the second pin members F2, and in consideration of the contact area with the second pin members F2 having a circular cross section, the second deformable accommodating space G2 is formed in a circular closed loop shape.

[0056] In one embodiment of the present invention, even if the first and second pin members F1, F2 are sandwiched in the first and second deformable accommodation spaces G1, G2, the first and second pin members F1, F2 are intended to temporarily fix the branch portion B and the ring portion R forming the first and second deformable accommodation spaces G1, G2, and to stably maintain the connection positions P1, P2 connected to the branch portion B and the ring portion R, and to improve the workability for connecting the bus bar 15 connected through the connection positions P1, P2 or to take into consideration the convenience of distribution or handling of the sensing board 100. In the battery pack, when the first and second pin members F1, F2 are removed from the first and second deformable accommodating spaces G1, G2 and the constraint of the first and second pin members F1, F2 is eliminated, the first and second deformable accommodating spaces G1, G2 can fully accommodate the deformation of the branch portion B and ring portion R surrounding them, and the connecting positions P1, P2 connected to the branch portion B and ring portion R can be deformed or displaced in an elastic manner to follow the swelling of the battery cell 10.

[0057] In an embodiment of the present invention, the sensing structure mediating the transmission of state information between the battery cell 10 and the sensing substrate 100 may be formed in a symmetrical shape, for example, symmetrical with respect to the ring portion R or the second deformable accommodation space G2 formed by the ring portion R. More specifically, the first and second deformable accommodation spaces G1, G2 forming the sensing structure and the branch portion B and ring portion R surrounding them may be formed in an overall symmetrical shape, for example, first and second connection positions P1, P2 may be formed on both sides along the first direction Z1 with respect to the ring portion R, and a first support portion S1 at one end position and a first support portion S1 at the other end position may be formed on the opposite side of the ring portion R with respect to the first and second connection positions P1, P2. In this manner, in one embodiment of the present invention, the sensing structure for mediating the transmission of status information between the battery cell 10 and the sensing substrate 100 is formed in a symmetrical shape to provide temporary fixation for the connection positions P1, P2, or the connection positions P1, P2 or the sensing substrate 100 can be stably temporarily fixed by sandwiching the first and second pin members F1, F2 in the first and second deformable accommodating spaces G1, G2 for the purpose of temporarily fixing the sensing substrate 100, for example, the connection positions P1, P2 or the sensing substrate 100 can be stably temporarily fixed at positions symmetrical to each other.

[0058] In an embodiment of the present invention, the symmetrical shape of the sensing structure mediating the transmission of status information between the battery cell 10 and the sensing substrate 100 will be described in more detail below. That is, first and second connection positions P1 and P2 may be formed at inner positions adjacent to the ring portion R around the ring portion R, and a first support part S1 at one end position and a first support part S1 at the other end position may be formed at outer positions relatively far from the ring portion R. Here, the first and second connection positions P1 and P2 formed at inner positions along the first direction Z1 around the ring portion R may be formed in positions and shapes symmetrical to each other, and the first support part S1 at one end position and the first support part S1 at the other end position formed at outer positions along the first direction Z1 around the ring portion R may be formed in positions and shapes symmetrical to each other.

[0059] Throughout this specification, the connection positions P1 and P2 refer to positions where the bus bar 15 or the connection part 50 connected to the bus bar 15 is connected on the sensing board 100. For example, the connection positions P1 and P2 may have an appropriate area and structure in which the second connection region 52 of the connection part 50, for example, the second connection region 52 of the connection part 50 provided as a double-sided circuit board or a single-sided circuit board, can be mounted so as to form an electrical connection with the second connection region 52 of the connection part 50. The connection positions P1 and P2 may have a width (wide width along the second direction Z2) wider than the branch part B and may provide a stable support base for the second connection region 52 of the connection part 50, and may be provided with a conductive pattern (not shown) that can be electrically connected to the second connection region 52 of the connection part 50.

[0060] The present invention has been described with reference to the embodiments shown in the accompanying drawings, but this is merely illustrative, and those skilled in the art to which the present invention pertains will recognize that various modifications and equivalent alternative embodiments are possible. [Explanation of symbols]

[0061] 10 Battery Cells 11,12 Battery cell electrode terminals 13 Battery cell terminal surface 15 Busbar 15a Busbar connection piece 15c Busbar connecting piece 50 Connection 51 First Connection Area 52 Second Connection Area 100 Sensing Board 101 Sensor board body 151 First bus bar 152 2nd bus bar 501 First connection part 502 Second connection part B Branch R Ring G1 1st transformable storage space G2 Second transformable storage space S1 1st support part S2 Second support part P1 First connection position P2 Second connection position W Weld joint

Claims

1. A plurality of battery cells; a sensing substrate for collecting status information from the plurality of battery cells, the sensing substrate including: a body of the sensing substrate; a branch portion connected to the body of the sensing substrate by bypassing the sensing substrate to interpose a first deformable accommodation space between the body of the sensing substrate and the branch portion; and a ring portion connected to the branch portion to form a second deformable accommodation space; A connection position for connection to the battery cell is formed on the branch portion, The battery pack, wherein the connection positions include first and second connection positions disposed on either side of the ring portion.

2. The branch portion, together with the body of the sensing board, surrounds the first deformation receiving space; The battery pack according to claim 1 , wherein the ring portion completely surrounds the second deformable accommodating space.

3. The battery pack according to claim 1 , wherein the first and second deformable accommodating spaces are closed from the outside.

4. The battery pack according to claim 1 , wherein the first deformable accommodating space extends in the first direction between the branch portion and the body of the sensing board, the branch portion extending in parallel in the first direction.

5. The battery pack according to claim 1 , wherein the first deformable accommodating space is closed by a first support part connected to a body of the sensing board at both ends in a first direction.

6. The battery pack according to claim 5 , wherein the first support portion connects rounded branches extending in parallel along the first direction to the body of the sensing board.

7. The battery pack according to claim 1 , wherein the ring portion extends in a circular closed loop shape and surrounds the circular second deformation accommodating space.

8. 2. The battery pack according to claim 1, wherein the ring portion is connected to the branch portions extending on both sides of the ring portion and the main body of the sensing board via three second support portions formed along a periphery of the ring portion.

9. 9. The battery pack of claim 8, wherein the second support portion, which connects the ring portion and the body of the sensing board to each other, divides a first deformable accommodating space formed between the branch portion on which the ring portion is formed and the body of the sensing board into two.

10. The battery pack of claim 1 , wherein the first and second connection positions are arranged along a first direction in which the plurality of battery cells are arranged.

11. 2. The battery pack of claim 1, wherein the first and second connection positions are connected to first and second bus bars disposed adjacent to each other along a first direction, or to first and second connection parts adjacent to each other along the first direction to be connected to the first and second bus bars.

12. The battery pack of claim 11, wherein first and second connection parts connected to the first and second bus bars are connected to the first and second connection positions.

13. The battery pack of claim 11, wherein the first and second bus bars connect different battery cells to each other.

14. 2. The battery pack according to claim 1, wherein the ring portion is connected to the branch portion having the first connection position and the branch portion having the second connection position via second support portions formed on both sides of the ring portion.

15. A first support portion is formed at one end position on the opposite side of the ring portion with respect to the first connecting position, the first support portion being configured to close the first deformation accommodation space, The battery pack according to claim 13 , wherein a first support portion is formed at an opposite end position of the second connecting position to the ring portion, the first support portion closing the first deformable accommodating space.

16. With the ring portion as the center, The first and second connecting positions are formed at inner positions adjacent to the ring portion, The battery pack according to claim 15, wherein a first support portion at the one end and a first support portion at the other end are formed at outer positions relatively far from the ring portion.

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