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 Art

[0002] Generally, unlike a primary battery that cannot be charged, a secondary battery is 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, etc. Depending on the type of external device to which they are applied, they are used in the form of a single battery or in a module form in which a plurality of batteries are connected and grouped into one unit.

[0003] Small mobile devices such as mobile phones can operate for a predetermined time with the output and capacity of a single battery. However, when long-time driving and high-power driving are required, such as in electric vehicles and hybrid vehicles that consume a large amount of power, a module form including a plurality of batteries is preferred due to output and capacity issues, and the output voltage and output current are increased depending on the number of built-in batteries.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The problem to be solved by the present invention is that, through a sensing substrate that provides a deformation accommodation space so that a part of the sensing substrate for obtaining state information of a battery cell is flexibly deformed, it can flexibly follow the positional movement of a bus bar caused by volume expansion such as swelling of the battery cell during charging and discharging of the battery cell, and prevent the accumulation of internal stress due to the positional movement of the bus bar and damage caused thereby. The object is to provide a battery pack including a sensing substrate.

Means for Solving the Problems

[0005] To solve the aforementioned problems and other problems, the present invention provides a battery pack comprising: a plurality of battery cells; and a sensing substrate for collecting state information from the plurality of battery cells, the sensing substrate comprising: a body of the sensing substrate; a branch portion connected to the sensing substrate by bypassing it such that a first deformation accommodation space is interposed between the body of the sensing substrate and the branch portion; and a ring portion connected to the branch portion to form a second deformation accommodation space.

[0006] For example, the branch portion, together with the main body of the sensing substrate, can surround the first deformation accommodation space, and the ring portion can completely surround the second deformation accommodation space.

[0007] For example, the first and second deformation-containment spaces can be formed in a form that is closed off from the outside.

[0008] For example, the first deformation accommodation space extends along the first direction between the branch portion extending in a line along the first direction and the body of the sensing substrate.

[0009] For example, the first deformation accommodation space may be closed by a first support portion connected to the main body of the sensing substrate at both ends along the first direction.

[0010] For example, the first support portion can connect the main body of the sensing substrate to branches that have a rounded shape and extend in a line along the first direction.

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

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

[0013] For example, the second support portion that connects the ring portion and the main body of the sensing substrate can divide the first deformation-accommodating space formed between the branch portion on which the ring portion is formed and the main body of the sensing substrate into two parts.

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

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

[0016] For example, the first and second connection positions may be arranged along the 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 busbars arranged adjacent to each other along the first direction, or to first and second connection points adjacent to each other along the first direction so as to be connected to first and second busbars.

[0018] For example, the first and second connection points may be connected to the first and second busbars.

[0019] For example, the first and second busbars can connect different battery cells to each other.

[0020] For example, the ring portion can be connected to the branch portion where the first connection position is formed and the branch portion where 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 that closes the first deformation-accommodating space may be formed on the opposite side of the ring portion, centered on the first connection position, and a first support portion at the other end that closes the first deformation-accommodating space may be formed on the opposite side of the ring portion, centered on the second connection position.

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

[0023] According to the present invention, there is provided a battery pack including a sensing substrate for obtaining state information of a battery cell, the sensing substrate being configured to flexibly follow a positional movement of a bus bar that occurs in association with a volume expansion such as swelling of the battery cell caused during charging and discharging of the battery cell, via a sensing substrate that provides a deformation accommodation space so that a part of the sensing substrate can be deformed flexibly, thereby preventing accumulation of internal stress due to the positional movement of the bus bar and damage caused thereby.

Brief Description of the Drawings

[0024] [Figure 1] FIG. 1 is an exploded perspective view of a battery pack according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view showing a part of the battery pack shown in FIG. 1. [Figure 3] FIG. 3 is a drawing showing a sensing structure for collecting state information of a battery cell, including a sensing substrate and a connection part connected on the sensing substrate, which is a part of the battery pack shown in FIG. 1. [Figure 4] FIG. 4 is a drawing exemplarily showing first and second pin members sandwiched between first and second deformation accommodation spaces for temporarily fixing a sensing substrate, which is a part of the battery pack shown in FIG. 3.

Embodiments for Carrying Out the Invention

[0025] 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 an embodiment of the present invention.

[0027] FIG. 2 is an exploded perspective view showing a part of the battery pack shown in FIG. 1.

[0028] Figure 3 is a diagram showing a part of the battery pack shown in Figure 1, including a sensing board and a connection part connected to the sensing board, and illustrating a sensing structure for collecting status information of the battery cells.

[0029] Figure 4 is a diagram illustrating a part of the battery pack shown in Figure 3, specifically the first and second pin members that are sandwiched between the first and second deformation accommodation spaces for temporary fixing of the sensing substrate.

[0030] Referring to Figures 1 to 4, a battery pack according to one embodiment of the present invention comprises a plurality of battery cells 10, and a sensing substrate 100 for collecting state 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 that is connected around the sensing substrate 100 so as to interpose a first deformation accommodation space G1 between the main body 101 of the sensing substrate 100, and a ring portion R connected on the branch portion B to form a second deformation accommodation space G2.

[0031] In one embodiment of the present invention, the sensing substrate 100 extends across the terminal surfaces 13 of a plurality of battery cells 10 arranged along a first direction Z1, and first and second electrode terminals 11 and 12 of opposite polarity are formed on the terminal surfaces 13 of the battery cells 10, arranged along a second direction Z2 that intersects the first direction Z1, and the first and second electrode terminals 11 and 12 can be formed in first and second rows on both sides of the second direction Z2 along the plurality of battery cells 10 arranged along the first direction Z1. At this time, the busbars 15 that connect the first and second electrode terminals 11 and 12 of different battery cells 10 and electrically connect the different battery cells 10 can also be formed in first and second rows on both sides of the second direction Z2 along the battery cells 10 arranged along the first direction Z1 so as to form an electrical connection with the first and second rows of electrode terminals 11 and 12.

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

[0033] Throughout this specification, the body 101 of the sensing substrate 100 means the main part of the sensing substrate 100 that is located inward along the second direction Z2 from the branch portion B, with the branch portion B branching outward from the body 101 of the sensing substrate 100 so as to approach the first and second rows of bus bars 15 across the first deformation accommodation space G1, and can occupy most of the area of ​​the sensing substrate 100. For example, in one embodiment of the present invention, the sensing substrate 100 includes the body 101 of the sensing substrate 100 that extends across the terminal surfaces 13 of a plurality of battery cells 10 arranged along the first direction Z1 at a relatively inward position along the second direction Z2, and the branch portion B that is located in a relatively outward position along the second direction Z2 across the first deformation accommodation space G1 so as to approach the first and second rows of bus bars 15 from the body 101 of the sensing substrate 100. The branch portion B may be positioned relatively outward, separated by the first deformation accommodation space G1, so as to approach the first and second rows of busbars 15 from the main body 101 of the sensing substrate 100, which is positioned relatively inward. Throughout this specification, "inward position" means a direction in which the first and second electrode terminals 11 and 12 of opposite polarities, which are arranged along the second direction Z2, face each other, or a relative position along the direction in which they face each other, and "outward position" may mean a direction in which the first and second electrode terminals 11 and 12 of opposite polarities, which are arranged along the second direction Z2, face away from each other, or a relative position along the direction in which they face away from each other.

[0034] In one embodiment of the present invention, the state information of the battery cell 10 includes state information such as the temperature, voltage, and current of the battery cell 10, and the state information compiled from the battery cell 10 is transmitted via the sensing board 100 to a battery management unit (not shown) connected to one end of the sensing board 100. In one embodiment of the present invention, state information of the battery cell 10 can be obtained via a 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, via a connection part 50 connected to the bus bar 15. For example, temperature information of the battery cell 10 can be obtained via a bus bar 15 that is thermally connected to the first and second electrode terminals 11 and 12 of the battery cell 10, and voltage information of the battery cell 10 can be obtained via a 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 relating to the state information of the battery cell 10, including temperature information and / or voltage information of the battery cell 10, is generated via a connection portion 50 connected to a bus bar 15, and the generated electrical signal is also transmitted to a sensing board 100. In one embodiment of the present invention, the sensing board 100 can also be connected to a bus bar 15 connected to the terminal surface 13 of the battery cell 10 in order to collect state information of the battery cell 10, and in various embodiments of the present invention, the sensing board 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 board 100 is connected to the battery cell 10 in order to obtain state information of the battery cell 10 comprehensively means that it is either directly connected to the battery cell 10 itself, such as to the terminal surface 13 of the battery cell 10, or connected to a bus bar 15 connected to the battery cell 10.

[0035] In one embodiment of the present invention, the sensing substrate 100 also includes a main body 101 of the sensing substrate 100 and branch portions B connected from the main body 101 of the sensing substrate 100 to the respective battery cell 10 side (e.g., bus bar 15). The sensing substrate 100, including the main body 101 of the sensing substrate 100 and the branch portions B of the sensing substrate 100, is generally arranged between the first and second rows of bus bars 15, and may be positioned on the inside between the first and second rows of bus bars 15, for example, along a second direction Z2 intersecting a first direction Z1.

[0036] In one embodiment of the present invention, a connecting portion 50 is interposed between the busbar 15 and the sensing substrate 100 to mediate the connection between the busbar 15 and the sensing substrate 100. The connecting portion 50 mediates the transmission of state information of the battery cell 10 between the busbar 15 and the sensing substrate 100. In one embodiment of the present invention, the connecting portion 50 can not only transmit state information of the battery cell 10, but also generate electrical signals related to the state information of the battery cell 10 and transmit the generated state information of the battery cell 10 to the sensing substrate 100.

[0037] In one embodiment of the present invention, the connection portion 50 includes a first connection region 51 thermally and / or electrically connected to the busbar 15, and a second connection region 52 electrically connected to the sensing substrate 100, and includes a sensing element 55 for mediating the transmission of state information of the battery cell 10 between the busbar 15 and the sensing substrate 100, and for generating state information such as temperature and voltage as state information of the battery cell 10 transmitted via the first connection region 51 as an electrical signal. However, in one embodiment of the present invention, the sensing element 55 may be formed in the second connection region 52 connected to the sensing substrate 100, among the first connection region 51 connected to the busbar 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 can transmit temperature information of the busbar 15 to the sensing element 55 in the second connection region 52 while forming a thermal connection with the busbar 15, and can transmit voltage information of the busbar 15 to the sensing element 55 in the second connection region 52 while forming an electrical connection with the busbar 15 in the first connection region 51. Furthermore, the state information of the battery cell 10 generated by the sensing element 55 is also transmitted to the main body 101 of the sensing board 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. The first connection region 51 is connected to the busbar 15 via a welded joint W with the busbar 15, and in one embodiment of the present invention, the first connection region 51 and the busbar 15 may be connected to each other by laser welding.

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

[0041] The configuration of the sensing board 100 for collecting state information of the battery cells 10 will be described in more detail below. The sensing board 100 also includes a main body 101 of the sensing board 100 and a branch portion B that is connected to the main body 101 of the sensing board 100 by bypassing the main body 101 of the sensing board 100 and approaching the bus bar 15, with a first deformation accommodation space G1 interposed between them. The branch portion B generally extends in parallel with the main body 101 of the sensing board 100 along a first direction Z1 and may be positioned offset from the main body 101 of the sensing board 100 toward the bus bar 15 along a second direction Z2 that intersects the first direction Z1 in which the plurality of battery cells 10 are arranged. The branch portion B generally extends along the first direction Z1 for a long distance, and first support portions S1 connected to the main body 101 of the sensing board 100 may be formed at both ends of the branch portion B that extends along the first direction Z1. In one embodiment of the present invention, the branch portion B can provide connection positions P1 and 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 deformation-accommodating space G2 may be formed on the branch portion B, along with the connection positions P1 and P2 with the connection portion 50, so that the branch portion B providing the connection positions P1 and 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 as a result of the swelling of the battery cell 10.

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

[0043] The first deformation-accommodating space G1 is formed between the main body 101 and the branch portion B of the sensing substrate 100 along a second direction Z2 that intersects with a first direction Z1 in which a plurality of battery cells 10 are arranged, and the second deformation-accommodating space G2 is formed on the branch portion B extending along the first direction Z1 between adjacent first and second connecting positions P1 and P2. In one embodiment of the present invention, both the first and second deformation-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 deformation-accommodating spaces G1 and G2. For example, the first deformation-accommodating space G1 is surrounded by the branch portion B of the sensing substrate 100, more specifically, by the branch portion B and the main body 101 of the sensing substrate 100, and the second deformation-accommodating space G2 is surrounded by the ring portion R of the sensing substrate 100. In one embodiment of the present invention, the first and second deformation-accommodating spaces G1 and G2 can also be formed in a form that is closed from the outside. For example, the first deformation-accommodating space G1 can be formed in a form that is closed from the outside by being surrounded by the branch portion B and the main body 101 of the sensing substrate 100, and the second deformation-accommodating space G2 can be formed in a form that is closed from the outside by being surrounded by the ring portion R. For example, when the branch portion B surrounds the first deformation-accommodating space G1, the branch portion B surrounds a part of the first deformation-accommodating space G1, and when the ring portion R surrounds the second deformation-accommodating space G2, the ring portion R can completely or entirely surround the second deformation-accommodating space G2.

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

[0045] In one embodiment of the present invention, the first and second deformation-accommodating spaces G1 and G2 are surrounded by the sensing substrate 100 and formed in a closed manner from the outside, thereby preventing twisting, fluttering, and deformation that causes the sensing substrate 100 to lift off the plane on which it is placed, and maintaining the coplanarity of the sensing substrate 100. If, contrary to the present invention, the first and second deformation-accommodating spaces G1 and G2 are formed in a manner that is open to the outside, then a part of the sensing substrate 100 surrounding the first and second deformation-accommodating spaces G1 and G2 (for example, the branch portion B that forms the first deformation-accommodating space G1, or the ring portion R that forms the second deformation-accommodating space G2, in particular the ends of the branch portion B and ring portion R that open the first and second deformation-accommodating spaces G1 and G2) will not be able to maintain coplanarity on the plane on which the sensing substrate 100 is placed, and deformation such as twisting, flapping, and floating will cause the connection positions P1 and P2 to flow excessively, thereby reducing the workability for connecting with the connection portion 50 at the connection positions P1 and P2.

[0046] In one embodiment of the present invention, the first deformation-accommodating space G1 is also formed in a form that extends long along a first direction Z1 in which a plurality of battery cells 10 are arranged, and extends long along the first direction Z1 between a branch B that extends generally in line along the first direction Z1 and the main body 101 of the sensing substrate 100. For example, as the first deformation-accommodating space G1 is distorted along the first direction Z1 in which a 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 represented, the branch B that forms the first deformation-accommodating space G1 and the connecting positions P1, P2 connected to the branch B may be deformed or displaced along the first direction Z1. In one embodiment of the present invention, the first deformation-accommodating space G1 extends long along the first direction Z1 between the branch B and the main body 101 of the sensing substrate 100, and both ends of the first deformation-accommodating space G1 are also closed by a first support S1 that connects the branch B and the main body 101 of the sensing substrate 100.

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

[0048] In one embodiment of the present invention, the second deformation-accommodating space G2 is formed in a closed loop shape surrounded by an annular portion R connected to the branch portion B, and is formed in a circular closed loop shape depending on the shape of the annular portion R. In one embodiment of the present invention, the annular portion R is formed in a circular closed loop shape, and therefore deforms flexibly in response to thermal stress that can act in various directions, including the first and second directions Z1 and Z2, due to the thermal expansion of the battery cell 10, for example, and does not have a special directionality. However, in other embodiments of the present invention, the annular portion R can be formed in various polygonal shapes other than circular, including elliptical and quadrilateral shapes, and may have anisotropy, exhibiting different behaviors depending on the direction of the thermal stress.

[0049] For example, the second deformation-accommodating space G2 is deformed along a first direction Z1 in which a plurality of battery cells 10 are arranged, or along a first direction Z1 in which the swelling of the plurality of battery cells 10 is cumulatively represented, and the ring portion R that forms the second deformation-accommodating space G2, and the connection positions P1, P2 connected to the ring portion R, can be deformed or displaced along the first direction Z1. In one embodiment of the present invention, the ring portion R, or the second deformation-accommodating space G2 formed by the ring portion R, is formed between two different first and second connection positions P1, P2 along the first direction Z1, and the first and second connection positions P1, P2 can be expanded and contracted while allowing relative displacement between them. The first and second connection positions P1 and P2 are connected to first and second bus bars 151 and 152 (adjacent first and second connecting parts 501 and 502 connected to the first and second bus bars 151 and 152 adjacent to each other along the first direction Z1), respectively, and the ring part R, or the second deformation accommodation space G2 formed by the ring part R, can expand and contract to connect the first and second connection positions P1 and P2 to which the first and second bus bars 151 and 152 adjacent to each other along the first direction Z1 are connected. The first and second connection positions P1 and P2 are formed at different locations on the branch part B extending along the first direction Z1, and include first connection positions P1 and P2 formed between a first support part S1 formed at one end of the branch part B and the ring part R, and second connection positions P1 and P2 formed between a first support part S1 formed at the other end of the branch part B and the ring part R.

[0050] In one embodiment of the present invention, the ring portion R forming the second deformation-accommodating space G2 may be supported by other components of the sensing substrate 100 via two or more second support portions S2 formed along the periphery of the ring portion R. For example, in one embodiment of the present invention, the ring portion R is also connected to the branch portion B via the second support portions S2 on both sides along the first direction Z1, and to the branch portion B where the first and second connection positions P1 and P2 are formed, respectively. In one embodiment of the present invention, the ring portion R is also supported by the branch portion B of the sensing substrate 100 and the main body 101 of the sensing substrate 100 extending on both sides of the ring portion R along the first direction Z1, via three second support portions S2 formed along the periphery of the ring portion R. More specifically, the ring portion R is connected to the branch portion B on both sides via the second support portions S2, while also being connected to the main body 101 of the sensing substrate 100 via other second support portions S2. Furthermore, the second support portion S2, which connects the ring portion R and the main body 101 of the sensing substrate 100, can divide the first deformation-accommodating space G1 formed between the branch portion B on which the ring portion R is formed and the main body 101 of the sensing substrate 100 into two. In this case, two first deformation-accommodating spaces G1, divided by the second support portion S2, can be formed between the branch portion B and the main body 101 of the sensing substrate 100.

[0051] In one embodiment of the present invention, the sensing substrate 100 includes a main body 101 of the sensing substrate 100 and a branch portion B that is separated from the main body 101 of the sensing substrate 100 at an outward position with a first deformation-accommodating space G1 interposed therebetween. Through this specification, the branch portion B means, whole or in part, the portion that is separated from the main body 101 of the sensing substrate 100 with a first deformation-accommodating space G1 interposed therebetween Thus, through this specification, branch B means, either entirely or partially, the portion of the sensing substrate 100 that is separated from the main body 101 of the sensing substrate 100 by the first deformation-accommodating space G1, and in that sense, the second support S2 is also understood to connect the ring R that forms the second deformation-accommodating space G2 to branch B, and branch B is also understood to include the second support S2. In one embodiment of the present invention, branch B includes first support S1 formed at both ends of the first deformation-accommodating space G1 along the first direction Z1, and includes a pair of second support S2 formed at both ends of the ring R that surrounds the second deformation-accommodating space G2 along the first direction Z1, and generally means the portion of the sensing substrate 100 that is separated from the main body 101 of the sensing substrate 100 by the first deformation-accommodating space G1.

[0052] In one embodiment of the present invention, the first and second deformation-accommodating spaces G1 and G2 are also formed in a form that is closed from the outside, for example, by being 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 portion 50 from moving arbitrarily, and for example, the sensing substrate 100 as a whole maintains coplanarity while the busbar 15 using the connection portion 50 and the sensing substrate 100 can be easily connected.

[0053] In one embodiment of the present invention, the first and second deformation-accommodating spaces G1 and G2, in a battery pack where the busbar 15 has been connected, allow deformation or displacement of the connection positions P1 and P2 connected to the busbar 15 or the connection portion 50, thereby allowing flexible deformation or displacement to adapt to the swelling of the battery cell 10, relieving internal stress accumulated in the sensing substrate 100, and contributing to the objective of preventing damage to the sensing substrate 100 due to the accumulation of internal stress. However, in a battery pack where the connection with the busbar 15 has not yet been completed, the first and second deformation-accommodating spaces G1 and G2 can be used to temporarily fix the sensing substrate 100, taking into consideration the ease of connection with the busbar 15 and to improve the convenience of distribution or handling of the sensing substrate 100. Through this specification, temporarily fixing the sensing substrate 100 means, rather than completely fixing the sensing substrate 100 in place, that a part of the sensing substrate 100, such as the branch portion B and the ring portion R, is fixed in place using pin members F1 and F2 which are sandwiched between the branch portion B and the ring portion R.

[0054] The following describes in more detail the structure for temporarily fixing the sensing substrate 100 via the first and second deformation-accommodating spaces G1 and G2. For example, by temporarily fixing the sensing substrate 100 via the first and second deformation-accommodating spaces G1 and G2, the workability for connecting the busbar 15 can be improved. More specifically, the first and second deformation-accommodating spaces G1 and G2 can contribute to preventing movement of the connection positions P1 and P2 with the connection portion 50 and ensuring stable connection with the busbar 15. For example, pin members F1 and F2 for temporarily fixing the branch portion B and ring portion R that form the first and second deformation-accommodating spaces G1 and G2 can be inserted in at least a portion of the first and second deformation-accommodating spaces G1 and G2. For example, in one embodiment of the present invention, pin members F1 and F2 can be inserted in a portion of the first and second deformation-accommodating spaces G1 and G2, specifically at both ends of the first deformation-accommodating space G1 and in the second deformation-accommodating space G2.

[0055] In one embodiment of the present invention, for convenience during connection with the busbar 15 and / or for the distribution or handling of the sensing substrate 100, pin members F1 and F2 are sandwiched in at least a portion of the first and second deformation-accommodating spaces G1 and G2. A first pin member F1 is sandwiched in each of the first support portions S1 formed at both ends of the first deformation-accommodating space G1, more specifically, at both ends of the first deformation-accommodating space G1. Considering the connection with the first pin member F1, for example, considering the contact area with the first pin member F1 which has a circular cross-section, the first support portion S1 is formed in a rounded shape. That is, the first support portion S1 can connect the branch portion B which extends in a rounded shape along the first direction Z1 and the main body 101 of the sensing substrate 100. On the other hand, a second pin member F2 is sandwiched in the second deformation-accommodating space G2, and considering the contact area with the second pin member F2 which has a circular cross-section, the second deformation-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 and F2 are sandwiched between the first and second deformation accommodation spaces G1 and G2, the first and second pin members F1 and F2 are intended to temporarily fix the branch portion B and ring portion R that form the first and second deformation accommodation spaces G1 and G2, and to stably maintain the connection positions P1 and P2 connected to the branch portion B and ring portion R, and to improve the workability for connecting the busbars 15 connected via the connection positions P1 and P2, or to take into consideration the convenience of the distribution or handling of the sensing substrate 100, and the connection of the busbars 15 is completed In the battery pack described above, the first and second deformation-accommodating spaces G1 and G2 are configured such that the first and second pin members F1 and F2 are removed from the first and second deformation-accommodating spaces G1 and G2, and the constraints on the first and second pin members F1 and F2 are removed. With these constraints removed, the first and second deformation-accommodating spaces G1 and G2 can adequately accommodate the deformation of the branch portion B and ring portion R surrounding them, and the connection positions P1 and P2 connected to the branch portion B and ring portion R can expand and contract and be deformed or displaced in accordance with the swelling of the battery cell 10.

[0057] In one embodiment of the present invention, the sensing structure that mediates the transmission of state information between the battery cell 10 and the sensing substrate 100 can also be formed in a symmetrical shape, for example, in a symmetrical shape centered on the ring portion R, or the second deformation accommodation space G2 formed by the ring portion R. More specifically, the first and second deformation accommodation spaces G1 and G2 that form the sensing structure, and the branch portion B and ring portion R surrounding them can also be formed in an overall symmetrical shape, for example, with the ring portion R as the center, first and second connection positions P1 and P2 are formed on both sides along the first direction Z1, and with each of the first and second connection positions P1 and P2 as the center, a first support portion S1 at one end position and a first support portion S1 at the other end position can be formed on the side opposite to the ring portion R, connecting the branch portion B and the main body 101 of the sensing substrate 100. Thus, in one embodiment of the present invention, the sensing structure for mediating the transmission of state information between the battery cell 10 and the sensing substrate 100 is formed in a symmetrical shape, thereby providing temporary fixing to the connection positions P1 and P2. Alternatively, for the purpose of temporarily fixing the sensing substrate 100, the connection positions P1 and P2 or the sensing substrate 100 can be stably temporarily fixed by sandwiching the first and second pin members F1 and F2 in the first and second deformation accommodation spaces G1 and G2. For example, the connection positions P1 and P2 or the sensing substrate 100 can be stably temporarily fixed in positions symmetrical to each other.

[0058] In one embodiment of the present invention, the symmetrical shape of the sensing structure that mediates the transmission of state information between the battery cell 10 and the sensing substrate 100 will be described in more detail as follows. That is, with the ring portion R as the center, first and second connecting positions P1 and P2 are formed at inner positions adjacent to the ring portion R, and a first support portion S1 at one end and a first support portion S1 at the other end can be formed at outer positions relatively far from the ring portion R. Here, the first and second connecting positions P1 and P2 formed at inner positions along the first direction Z1 with respect to the ring portion R are formed in symmetrical positions and shapes, and the first support portion S1 at one end and the first support portion S1 at the other end, formed at outer positions along the first direction Z1 with respect to the ring portion R, can be formed in symmetrical positions and shapes.

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

[0060] Although the present invention has been described with reference to embodiments shown in the accompanying drawings, these are merely illustrative, and a person with ordinary skill in the art to which the present invention pertains will understand that a variety of modifications and equivalent other embodiments are possible therefrom.

[0061] [1] Multiple battery cells, A battery pack comprising a sensing board for collecting state information from a plurality of battery cells, the sensing board including a main body of the sensing board, a branch portion connected around the sensing board such that a first deformation accommodation space is interposed between the sensing board and the main body of the sensing board, and a ring portion connected on the branch portion to form a second deformation accommodation space. [2] The branch portion, together with the main body of the sensing substrate, surrounds the first deformation accommodation space. The battery pack according to [1], characterized in that the ring portion completely surrounds the second deformation accommodation space. [3] The battery pack according to [1], characterized in that the first and second deformable storage spaces are formed in a form that is closed from the outside. [4] The battery pack according to [1], characterized in that the first deformation accommodation space extends along the first direction between the branch portion extending in a line along the first direction and the body of the sensing substrate. [5] The battery pack according to [1], characterized in that the first deformation accommodation space is closed by first support portions connected to the main body of the sensing substrate at both ends along the first direction. [6] The battery pack according to [5], characterized in that the first support portion has a rounded shape and connects the main body of the sensing substrate to branches that extend in a line along the first direction. [7] The battery pack according to [1], characterized in that the ring portion extends in a circular closed loop shape and surrounds a circular second deformation housing space. [8] The battery pack according to [1], characterized in that the ring portion is connected to the branch portions extending on both sides of the ring portion and the main body of the sensing substrate via three second support portions formed along the periphery of the ring portion. [9] The battery pack according to [8], wherein the second support portion, which connects the ring portion and the main body of the sensing substrate to each other, divides the first deformation accommodation space formed between the branch portion on which the ring portion is formed and the main body of the sensing substrate into two parts.

[10] The battery pack according to [1], characterized in that a connection position is formed on the branch portion to connect with the battery cell side.

[11] The battery pack according to

[10] , characterized in that the connection position includes first and second connection positions arranged on both sides with respect to the ring portion.

[12] The battery pack according to

[11] , characterized in that the first and second connection positions are arranged along the first direction in which the plurality of battery cells are arranged.

[13] The battery pack according to

[11] , characterized in that the first and second connection positions are connected to first and second busbars arranged adjacent to each other along a first direction, or to first and second connection portions adjacent to each other along a first direction so as to be connected to first and second busbars.

[14] The battery pack according to

[13] , characterized in that the first and second connection positions are connected to the first and second busbars.

[15] The battery pack according to

[13] , characterized in that the first and second busbars connect different battery cells to each other.

[16] The battery pack according to

[11] , characterized in that the ring portion is connected to the branch portion where the first connection position is formed and the branch portion where the second connection position is formed via second support portions formed on both sides of the ring portion.

[17] Centered on the first connection position, a first support portion is formed at one end position that closes the first deformation accommodation space on the opposite side of the ring portion. The battery pack according to

[15] , characterized in that a first support portion is formed at the other end position that closes the first deformation accommodation space, on the opposite side of the ring portion, with the second connection position as the center.

[18] Centered on the ring portion, The first and second connecting positions are formed at the inner position adjacent to the ring portion. The battery pack according to

[17] , characterized in that a first support portion at one end and a first support portion at the other end are formed at an outer position relatively far from the ring portion. [Explanation of Symbols]

[0062] 10 battery cells 11,12 Battery cell electrode terminals 13. Terminal side of the battery cell 15 Bus Bar 15a Busbar connector 15c Busbar connecting piece 50 Connection part 51 First Connection Area 52 Second Connection Area 100 sensing board 101 Main body of the sensing board 151 Bus Bar No. 1 152 Second Bus Bar 501 First connection section 502 Second Connection Section B Branch R Ring G1 First Deformed Containment Space G2 Second Deformable Containment Space S1 First Support Department S2 Second Support Department P1 First connection position P2 Second connection position W Welding joint

Claims

1. Multiple battery cells, A sensing board for collecting state information from the plurality of battery cells, comprising: a main body of the sensing board; a branch portion connected to the main body of the sensing board, bypassing the sensing board so as to interpose a first deformation-accommodating space; and a ring portion connected to the branch portion to form a second deformation-accommodating space, The battery pack is formed such that the first and second deformation-retaining spaces are completely surrounded by a portion of the sensing substrate and closed off from the outside.

2. The branch portion, together with the main body of the sensing substrate, surrounds the first deformation accommodation space. The battery pack according to claim 1, characterized in that the ring portion completely surrounds the second deformation accommodation space.

3. The battery pack according to claim 1, characterized in that the first deformation accommodation space extends along the first direction between the branch portion extending in a line along the first direction and the main body of the sensing substrate.

4. The battery pack according to claim 1, characterized in that the first deformation accommodation space is closed by a first support portion connected to the main body of the sensing substrate at both ends along the first direction.

5. The battery pack according to claim 4, characterized in that the first support portion connects the main body of the sensing substrate to branches that have a rounded shape and extend in a line along the first direction.

6. The battery pack according to claim 1, characterized in that the ring portion extends in a circular closed loop shape and surrounds a circular second deformation housing space.

7. The battery pack according to claim 1, characterized in that the ring portion is connected to the branch portions extending on both sides of the ring portion and the main body of the sensing substrate via three second support portions formed along the periphery of the ring portion.

8. The battery pack according to claim 7, wherein the second support portion, which connects the ring portion and the main body of the sensing substrate to each other, divides the first deformation-accommodating space formed between the branch portion on which the ring portion is formed and the main body of the sensing substrate into two parts.

9. The battery pack according to claim 1, characterized in that a connection position is formed on the branch portion for connection with the battery cell side.

10. The battery pack according to claim 9, characterized in that the connection positions include first and second connection positions arranged on both sides of the ring portion.

11. The battery pack according to claim 10, characterized in that the first and second connection positions are arranged along the first direction in which the plurality of battery cells are arranged.

12. The battery pack according to claim 10, characterized in that the first and second connection positions are connected to first and second busbars arranged adjacent to each other along a first direction, or to first and second connection portions adjacent to each other along a first direction so as to be connected to first and second busbars.

13. The battery pack according to claim 12, characterized in that the first and second connection positions are connected to the first and second busbars, respectively.

14. The battery pack according to claim 12, characterized in that the first and second busbars connect different battery cells to each other.

15. The battery pack according to claim 10, characterized in that the ring portion is connected to the branch portion where the first connection position is formed and the branch portion where the second connection position is formed via second support portions formed on both sides of the ring portion.

16. Centered on the first connection position, a first support portion is formed at one end position that closes the first deformation accommodation space on the opposite side of the ring portion. The battery pack according to claim 14, characterized in that a first support portion is formed at the other end position that closes the first deformation accommodation space, on the opposite side of the ring portion, with the second connection position as the center.

17. Centered around the aforementioned ring portion, The first and second connecting positions are formed at the inner position adjacent to the ring portion. The battery pack according to claim 16, characterized in that a first support portion at one end and a first support portion at the other end are formed at an outer position relatively far from the ring portion.

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