Specification
Title of Invention: Sub-pack including a plurality of unit modules and BMS assembly and battery pack including same
technical field
[One]
The present invention relates to a sub-pack including a plurality of unit modules and a BMS assembly and a battery pack including the same, and more particularly, to a plurality of unit modules electrically connected in series and parallel through a connecting wire in a mixed form. The present invention relates to a sub-pack having a connected structure and a battery pack having a structure in which a pair of such sub-packs are connected in series through a serial bus bar.
[2]
This application is an application claiming priority to Korean Patent Application No. 10-2019-0169899 filed on December 18, 2019, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
background
[3]
Secondary batteries that are easy to apply according to product groups and have electrical characteristics such as high energy density are not only portable devices, but also electric vehicles (EVs) or hybrid vehicles (HEVs) driven by an electric drive source. It is universally applied. These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency in that not only the primary advantage of being able to dramatically reduce the use of fossil fuels, but also the fact that no by-products are generated from the use of energy.
[4]
The types of secondary batteries currently widely used include a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery, a nickel zinc battery, and the like. The unit secondary battery cell, that is, the operating voltage of the unit battery cell is about 2.5V ~ 4.5V. Accordingly, when a higher output voltage is required, a plurality of battery cells are connected in series to form a battery pack. In addition, a plurality of battery cells may be connected in parallel to form a battery pack according to the charge/discharge capacity required for the battery pack. Accordingly, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge/discharge capacity.
[5]
On the other hand, when configuring a battery pack by connecting a plurality of battery cells in series/parallel, a battery module including at least one battery cell is first configured, and other components are added using the at least one battery module. A method of configuring the battery pack is common.
[6]
Therefore, through the development of a battery pack having a structure in which electrical/mechanical coupling between a plurality of unit modules and electrical/mechanical coupling between unit modules and a battery management system (BMS) can be made as simple as possible, in terms of component cost reduction and management loss needs to be minimized.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[7]
The present invention was devised in consideration of the above-described problems, and a subpack having a structure in which electrical/mechanical coupling between a plurality of unit modules and electrical/mechanical coupling between a unit module and a BMS can be performed as simply as possible, and a subpack including the same An object of the present invention is to provide a battery pack, thereby reducing component cost and minimizing loss in management.
[8]
However, the technical problems to be solved by the present invention are not limited to the above problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.
means of solving the problem
[9]
According to an embodiment of the present invention, there is provided a sub-pack comprising: a battery module assembly including a plurality of unit modules; and a BMS assembly coupled to one side in a longitudinal direction of the battery module assembly, wherein the battery module assembly comprises: a first sub-module including a plurality of unit modules connected in a longitudinal direction; and a second sub-module including a plurality of unit modules, the second sub-module being connected to the first sub-module along a width direction of the unit module; wherein the BMS assembly comprises: a first BMS for controlling charging/discharging of the first sub-module; a second BMS for controlling charging/discharging of the second sub-module; and a BMS frame wrapped around the first BMS and the second BMS and fastened to one side in the longitudinal direction of the battery module assembly. includes
[10]
The unit module may include: a plurality of battery cells forming a plurality of cell groups; a lower housing supporting the plurality of battery cells; an upper housing coupled to an upper portion of the lower housing and providing an accommodating space for the plurality of battery cells; and a plurality of parallel bus bars seated on the upper surface of the upper housing and spaced apart from each other and arranged side by side; may include.
[11]
The cell group may include a plurality of battery cells disposed along a length direction of the unit module.
[12]
Battery cells included in the same cell group may be connected in parallel through the parallel bus bar.
[13]
상기 제1 서브 모듈에 포함되는 복수의 단위 모듈은 동일 연장선 상에 위치하는 병렬 버스바 간의 전기적인 연결에 의해 병렬 연결되고, 상기 제2 서브 모듈에 포함되는 복수의 단위 모듈은 동일 연장선 사에 위치하는 병렬 버스바 간의 전기적인 연결에 의해 병렬 연결될 수 있다.
[14]
상기 제1 서브 모듈과 제2 서브 모듈 상호 간은 서로 인접한 병렬 버스바 간의 전기적인 연결에 의해 서로 직렬로 연결될 수 있다.
[15]
상기 동일한 셀 그룹 내에 포함되는 복수의 배터리 셀들 간의 병렬 연결, 동일한 서브 모듈에 포함되는 복수의 단위 모듈 간의 병렬 연결 및 서로 인접한 복수의 서브 모듈 간의 직렬 연결은 모두 와이어 본딩에 의해 이루어질 수 있다.
[16]
상기 로워 하우징은, 볼팅 홀을 구비하며 상기 로워 하우징의 길이 방향 일 측에 구비되는 적어도 하나의 체결 돌출부; 고정 돌기를 구비하며 상기 로워 하우징의 길이 방향 일 측에 구비되는 적어도 하나의 고정 돌출부; 상기 로워 하우징의 길이 방향 타 측에 구비되되 상기 체결 돌출부와 대응되는 위치에 대응되는 형상으로 구비되는 제1 체결 수용부; 및 상기 로워 하우징의 길이 방향 타 측에 구비되되 상기 고정 돌출부와 대응되는 위치에 대응되는 형상으로 구비되는 제1 고정 수용부; 를 포함할 수 있다.
[17]
The upper housing may include a bolting hole formed at a position corresponding to the first fastening receiving part; and a projection receiving groove formed at a position corresponding to the first fixing receiving portion and having a shape corresponding to the fixing projection; may include
[18]
The BMS frame may include: a plurality of front fastening parts provided at positions corresponding to the fastening protrusions and having bolting holes; a plurality of second fastening accommodating parts provided at positions corresponding to the front fastening part and the fastening protrusion; and a plurality of second fixing accommodating portions provided in shapes corresponding to positions corresponding to the fixing protrusions. may include
[19]
Each of the first BMS and the second BMS includes a plurality of sensing terminals, the sensing terminal of the first BMS is electrically connected to the parallel bus bar of the first sub-module by wire bonding, and the sensing of the second BMS The terminal may be electrically connected to the parallel bus bar of the second sub-module by wire bonding.
[20]
In a battery pack according to an embodiment of the present invention for solving the above problems, the sub-pack according to the embodiment of the present invention is coupled to each other in a mirror-symmetrical form with respect to a central axis parallel to the longitudinal direction of the sub-pack.
[21]
The battery pack may include a serial bus bar configured to connect a pair of sub-packs in series and seated on the BMS frame; may further include.
[22]
A vehicle according to an embodiment of the present invention includes a battery pack according to an embodiment of the present invention.
Effects of the Invention
[23]
According to one aspect of the present invention, electrical/mechanical coupling between a plurality of unit modules constituting a battery pack and electrical/mechanical coupling between the unit module and the BMS can be made as simple as possible, thereby reducing component costs and managing costs. loss can be minimized.
Brief description of the drawing
[24]
The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so the present invention is described in such drawings should not be construed as being limited only to
[25]
1 is a perspective view illustrating a battery pack according to an embodiment of the present invention.
[26]
FIG. 2 is a partial perspective view showing the front surface of the battery pack shown in FIG. 1 well.
[27]
3 is a perspective view illustrating a sub-pack according to an embodiment of the present invention.
[28]
FIG. 4 is a perspective view showing the lower surface of the sub pack shown in FIG. 3 well.
[29]
5 is a perspective view illustrating a battery module assembly applied to a sub-pack according to an embodiment of the present invention.
[30]
6 is a perspective view illustrating a unit module applied to the battery module assembly shown in FIG. 5 .
[31]
7 is a view showing the lower surface of the unit module shown in FIG. 6 well.
[32]
FIG. 8 is a partially enlarged view illustrating a coupling relationship between a pair of unit modules for constituting a sub-module applied to the battery module assembly shown in FIG. 5 .
[33]
9 is a partial perspective view showing the structure of the upper surface of the unit module shown in FIG. 6 .
[34]
FIG. 10 is a diagram illustrating an electrical connection relationship between unit modules constituting the battery module assembly shown in FIG. 5 .
[35]
11 is a view showing a rear block applied to the battery module assembly shown in FIG. 5 .
[36]
12 and 13 are perspective views illustrating the BMS assembly constituting the sub pack shown in FIG. 3 .
[37]
14 is a view illustrating an electrical coupling relationship between the BMS assembly shown in FIGS. 12 and 13 and the battery module assembly shown in FIG. 5 .
[38]
15 is a diagram illustrating an electrical connection relationship between a pair of sub-packs according to an embodiment of the present invention.
[39]
16 is a diagram illustrating a coupling structure between a BMS assembly and a battery module assembly constituting a sub-pack according to an embodiment of the present invention.
Modes for carrying out the invention
[40]
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하기로 한다. 이에 앞서, 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다. 따라서, 본 명세서에 기재된 실시예와 도면에 도시된 구성은 본 발명의 가장 바람직한 일부 실시예에 불과할 뿐이고 본 발명의 기술적 사상을 모두 대변하는 것은 아니므로, 본 출원시점에 있어서 이들을 대체할 수 있는 다양한 균등물과 변형예들이 있을 수 있음을 이해하여야 한다.
[41]
[42]
이하, 도 1 내지 도 5를 참조하여 본 발명의 일 실시예에 따른 배터리 팩에 대한 개략적인 구조를 설명하기로 한다.
[43]
도 1 내지 도 5를 참조하면, 본 발명의 일 실시예에 따른 배터리 팩은, 한 쌍의 서브 팩(1), 히트 싱크(heat sink)(2), 직렬 버스바(3) 및 복수의 체결 볼트(4)를 포함한다.
[44]
상기 한 쌍의 서브 팩(1)은 그 사이에 히트 싱크(2)를 개재한 상태로 배터리 팩의 폭 방향(Y축 방향)과 나란한 중심축을 기준으로 상호 거울 대칭된 형태를 가지며 결합된다. 즉, 상기 한 쌍의 서브 팩(1)은 각각의 바닥면이 서로 대면한 상태로 결합된다. 이하, 설명의 편의를 위해 필요한 경우, 상부에 위치하는 서브 팩(1)을 제1 서브 팩, 하부에 위치하는 서브 팩(1)을 제2 서브 팩이라 지칭하기로 한다. 상기 서브 팩(1)의 구체적인 구조에 대해서는 도 3 이하를 참조하여 상세히 후술하기로 한다.
[45]
상기 히트 싱크(2)는 배터리 팩의 냉각을 위해 적용되는 구성요소로서, 한 쌍의 서브 팩(1) 사이에 개재되며, 이에 따라 그 양 면이 한 쌍의 서브 팩(1) 각각의 바닥면과 접촉한다.
[46]
상기 직렬 버스바(3)는, 서로 거울 대칭 형태로 결합된 한 쌍의 서브 팩(1)을 직렬로 연결시켜준다. 즉, 상기 제1 서브 팩(1)의 폭 방향(Y축과 나란한 방향) 일 측 최외각에 위치하는 병렬 버스바(114)와 제2 서브 팩(1)의 폭 방향(Y축과 나란한 방향) 일 측 최 외각에 위치하는 병렬 버스바(114)는 서로 다른 극성을 가지며, 직렬 버스바(3)는 이러한 한 쌍의 병렬 버스바(114) 사이를 연결함으로써 한 쌍의 서브 팩(1)이 서로 직렬로 연결되도록 하는 것이다.
[47]
상기 체결 볼트(4)는, 한 쌍의 서브 팩(1) 간의 체결에 이용될 수 있다. 또한, 상기 체결 볼트(4)는, 이와는 달리, 단위 모듈(110)들 사이의 체결 및 배터리 모듈 어셈블리(10)와 BMS 어셈블리(20) 간의 체결에 이용되고, 이에 따라 완성된 서브 팩(1) 한 쌍의 결합은 제1 서브 팩(1)과 히트 싱크(2) 사이 및 제2 서브 팩(1)과 히트 싱크(2) 사이에 개재되는 접착층에 의해 이루어질 수도 있다. 또한, 결합력의 극대화를 위해 볼팅에 의한 체결 및 접착층이 개재에 의한 결합을 모두 적용하는 것도 가능하다.
[48]
[49]
다음은, 도 3 내지 도 5를 참조하여, 본 발명의 일 실시예에 따른 서브 팩(1)의 개략적인 구조를 설명하기로 한다.
[50]
도 3 내지 도 5를 참조하면, 본 발명의 일 실시예에 따른 서브 팩(1)은, 배터리 모듈 어셈블리(10) 및 BMS 어셈블리(20)를 포함한다.
[51]
상기 배터리 모듈 어셈블리(10)는, 복수의 서브 모듈(100), 리어 블록(200) 및 사이드 빔(300)을 포함한다.
[52]
The plurality of sub-modules 100 are connected to each other in series, and each sub-module 100 includes a plurality of unit modules 110 connected to each other in parallel. In the drawings of the present invention, one sub-module 100 has a form in which two unit modules 110 are combined, and one battery module assembly 10 has a form in which two sub-modules 100 are combined. Although only a case is shown, the present invention is not limited thereto. That is, one sub-module 100 may have a form in which three or more unit modules 110 are combined, and one battery module assembly 10 may have a form in which three or more sub-modules 100 are combined. It is also possible to have Meanwhile, for convenience of description, each of the pair of sub-modules 100 shown in FIG. 5 will be referred to as a first sub-module 100 and a second sub-module 100 .
[53]
Hereinafter, a detailed structure of the unit module 110 will be described with reference to FIGS. 6 to 9 .
[54]
6 to 9 , the unit module 110 includes a plurality of battery cells 111 , a lower housing 112 , an upper housing 113 , and a plurality of parallel bus bars 114 .
[55]
As the battery cell 111 , for example, a cylindrical battery cell may be applied. A plurality of the battery cells 111 may be provided along the longitudinal direction of the unit module 110 (in a direction parallel to the X-axis in FIG. 6 ), and also in the width direction of the unit module 110 (the Y-axis and the Y-axis in FIG. 6 ). A plurality may be provided along the side-by-side direction). The plurality of battery cells 111 are vertically disposed on the lower housing 112 . Each of the plurality of battery cells 111 includes a positive terminal 111a and a negative terminal 111b exposed to the outside through the upper surface of the upper housing 113 . When the battery cell 111 is a cylindrical battery cell, a can for accommodating the electrode assembly may function as the negative terminal 111b.
[56]
A plurality of battery cells 111 disposed along the longitudinal direction of the unit module 110 are connected in parallel to each other to form one cell group C. As shown in FIG. In addition, the plurality of cell groups C arranged along the width direction of the unit module 110 are connected in series to each other. Hereinafter, if necessary for convenience of description, two cell groups C adjacent to each other among the plurality of cell groups C will be referred to as a first cell group and a second cell group.
[57]
Referring to FIG. 9 , such a parallel/series connection is implemented using a plurality of parallel bus bars 114 and a connecting wire (W). Parallel bus bars 114 are disposed on both sides of each cell group C. As shown in FIG. The positive terminals 111a of the battery cells 111 constituting the first cell group C are connected to the parallel bus bar 114 located on one side of the first cell group C by wire bonding. connected The negative terminals 111b of the battery cells 111 constituting the first cell group C are connected to the parallel bus bar 114 located on the other side of the first cell group C by wire bonding. Accordingly, the plurality of battery cells 111 constituting the first cell group C are connected to each other in parallel.
[58]
In addition, the positive terminals 111a of the plurality of battery cells 111 constituting the second cell group C adjacent to the first cell group C are parallel bus bars 114 positioned at one side of the second cell group. ), that is, connected to the parallel bus bar 114 located on the other side of the first cell group C by wire bonding. The negative terminals 111b of the plurality of battery cells 111 constituting the second cell group C are connected to the parallel bus bar 114 located on the other side of the second cell group C by wire bonding. . Accordingly, the plurality of battery cells 111 constituting the second cell group C form a parallel connection with each other, and the first cell group C and the second cell group C form a series connection with each other.
[59]
6 to 9 , the lower housing 112 supports a plurality of battery cells 111 , and includes a fastening protrusion 112a , a fixed protrusion 112b , a first fastening receiving part 112c and a first fastening accommodating part 112c. 1 may include a fixed accommodating part 112d. The fixing protrusion 112b and the first fixing accommodating part 112d are not essential components, but may be provided for the convenience of fastening between the unit modules 110 .
[60]
At least one fastening protrusion 112a is provided on one side of the lower housing 112 in the longitudinal direction (in a direction parallel to the X axis of FIG. 6 ), and is formed to protrude to the outside of the lower housing 112 . The fastening protrusion 112a includes a bolting hole H1 into which the fastening bolt 4 (refer to FIG. 1 ) can be inserted along the height direction (parallel to the Z axis of FIG. 6 ) of the unit module 110 . . At least one fixing protrusion 112b is provided on one side in the longitudinal direction of the lower housing 112 , and is formed to protrude to the outside of the lower housing 112 . The fixing protrusion 112b includes a fixing protrusion f protruding upward (in a direction parallel to the Z-axis in FIG. 6 ).
[61]
상기 제1 체결 수용부(112c)는 로워 하우징(112)의 길이 방향 타 측에 구비되며, 체결 돌출부(112a)와 대응되는 위치에 대응되는 형상으로 구비된다. 따라서, 서브 모듈(100)의 형성을 위해 복수의 단위 모듈(110)을 길이 방향을 따라 체결하는 경우에 있어서, 하나의 단위 모듈(110)의 체결 돌출부(112a)는 인접한 다른 단위 모듈(110)의 제1 체결 수용부(112c) 내에 삽입된다. 또한, 상기 어퍼 하우징(113)은, 제1 체결 수용부(112c)와 대응되는 위치에 형성되는 볼팅 홀(H2)을 구비한다. 이에 따라, 한 쌍의 단위 모듈(110)이 결합되었을 때 로워 하우징(112)에 구비되는 볼팅 홀(H1)과 어퍼 하우징(113)에 구비되는 볼팅 홀(H2)은 하나의 체결 볼트(4)(도 1 참조)가 통과할 수 있도록 서로 동일한 위치에 놓여진다.
[62]
상기 제1 고정 수용부(112d)는 로워 하우징(112)의 길이 방향 타 측에 구비되며, 고정 돌출부(112b)와 대응되는 위치에 대응되는 형상으로 구비된다. 따라서, 서브 모듈(100)의 형성을 위해 복수의 단위 모듈(110)을 길이 방향을 따라 체결하는 경우에 있어서, 하나의 단위 모듈(110)의 고정 돌출부(112b)는 인접한 다른 단위 모듈(110)의 제1 고정 수용부(112d) 내에 삽입된다. 또한, 상기 어퍼 하우징(113)은, 제1 고정 수용부(112d)와 대응되는 위치에 형성되는 돌기 수용 홈(G)을 구비한다. 이에 따라, 한 쌍의 단위 모듈(110)이 결합되었을 때 로워 하우징(112)에 구비되는 고정 돌기(f)는 어퍼 하우징(113)에 구비되는 돌기 수용 홈(G) 내에 삽입되며, 이로써 한 쌍의 단위 모듈(110)이 수평 방향(도 6의 X-Y 평면에 나란한 방향)을 따라 움직이지 않도록 고정될 수 있다.
[63]
[64]
상기 어퍼 하우징(113)은, 복수의 배터리 셀(111)을 수용할 수 있는 공간을 제공하며, 적어도 하나의 볼팅 홀(H2) 및 상면에 형성되는 복수의 셀 노출부(113a)를 구비한다.
[65]
상기 볼팅 홀(H2)은, 앞서 언급한 바와 같이, 로워 하우징(112)의 제1 체결 수용부(112c)와 대응되는 위치에 형성되어 체결 볼트(4)(도 1 참조)가 삽입될 수 있는 공간을 제공한다.
[66]
상기 셀 노출부(113a)는 어퍼 하우징(113)의 길이 방향(도 6의 X축과 나란한 방향)을 따라 연장된 형태를 가지며, 셀 그룹(C)과 대응되는 위치에 셀 그룹(C)의 개수와 동일한 개수로 구비된다. 상기 셀 노출부(113a)는 배터리 셀(111)의 양극 단자(111a) 및 음극 단자(111b)가 어퍼 하우징(113)의 상면을 통해 외부로 노출될 수 있도록 복수의 슬릿(S)을 구비한다.
[67]
하나의 단위 모듈(110) 내에 구비되는 복수의 상기 배터리 셀(111)들은, 슬릿(S)을 통해 노출된 양극 단자(111a) 및 음극 단자(111b)가 병렬 버스바(114)와 와이어 본딩에 의해 연결됨으로써 직렬/병렬이 혼합된 형태로 전기적인 연결을 이룬다.
[68]
상기 병렬 버스바(114)는 셀 노출부(113a)와 나란한 방향으로 연장된 형태를 가지며, 어퍼 하우징(113)의 상면에 안착된다. 상기 병렬 버스바(114)는 복수의 셀 노출부(113a) 각각의 양 측에 배치된다. 복수의 병렬 버스바(114)들 중 단위 모듈(110)의 폭 방향(도 6의 Y축과 나란한 방향) 일 측 단부에 배치되는 병렬 버스바(114)와 타 측 단부에 배치되는 병렬 버스바(114)는 서로 다른 극성을 갖는다. 이는, 상기 단위 모듈(110)의 폭 방향을 따라 복수의 서브 모듈(100)을 연결함에 있어서 서로 직렬 연결이 가능하도록 하기 위함이다. 도 10을 참조하면, 서로 인접한 서브 모듈(100) 각각의 최 외측에 구비된 한 쌍의 병렬 버스바(114)가 서로 맞닿거나 또는 와이어 본딩에 의해 연결됨으로써 인접한 서브 모듈(100) 간의 직렬 연결이 이루어질 수 있다.
[69]
도 11을 참조하면, 상기 리어 블록(200)은 복수의 서브 모듈(100)의 기계적인 체결을 위해 적용되는 부품으로서, 복수의 리어 체결부(210) 및 복수의 리어 고정부(220)를 구비한다.
[70]
상기 리어 체결부(210)는 로워 하우징(112)의 제1 체결 수용부(112c)와 대응되는 위치에 대응되는 형상으로 구비된다. 상기 리어 체결부(210)는 어퍼 하우징(113)의 볼팅 홀(H2)과 대응되는 위치에 대응되는 사이즈로 형성되는 볼팅 홀(H3)을 구비한다.
[71]
상기 리어 고정부(220)는 로워 하우징(112)의 제1 고정 수용부(112d)와 대응되는 위치에 대응되는 형상으로 구비된다. 도면에 도시되지는 않았으나, 상기 리어 고정부(220)는 어퍼 하우징(113)의 돌기 수용 홈(G)(도 7 참조)과 대응되는 위치에 대응되는 사이즈로 형성되는 고정 돌기를 구비할 수 있다.
[72]
[73]
다음은, 도 12 내지 도 16을 참조하여, 상기 BMS 어셈블리(20)에 대해서 상세히 설명하기로 한다.
[74]
도 12 내지 도 16을 참조하면, 상기 BMS 어셈블리(20)는 복수의 BMS(battery management system)(21) 및 복수의 BMS(21)를 한꺼번에 감싸며 고정시키는 BMS 프레임(22)을 포함한다. 상기 BMS 어셈블리(20)는, 배터리 모듈 어셈블리(10)(도 5 참조)의 길이 방향(도 5의 X축과 나란한 방향) 일 측에 결합된다. 즉, 상기 BMS 어셈블리(20)는, 서브 팩(1)의 개수와 동일한 개수로 구비된다.
[75]
상기 BMS(21)는 복수개가 구비되며, 각각의 BMS(21)는 상부에 구비된 복수의 센싱 단자(T)를 통해 각각의 서브 모듈(100)과 1대1로 연결된다. 즉, 상기 BMS(21)는 서브 모듈(100)의 개수와 동일하게 구비된다. 도 14에 나타난 바와 같이, BMS(21)의 센싱 단자(T)들은 커넥팅 와이어(W)를 이용한 와이어 본딩에 의해 병렬 버스바(114)들과 1대1로 연결된다. 이로써, 하나의 BMS(21)는 복수의 셀 그룹(C)(도 7 참조)의 전압 및/또는 전류를 센싱하고 이에 따라 서브 모듈(100)의 충방전을 제어할 수 있다. 본 발명의 도면에서는 하나의 BMS 어셈블리(20)마다 BMS(21)가 두 개씩 구비되는 경우를 예시적으로 도시하고 있는데, 이 경우 각각의 BMS(21)를 설명의 편의를 위해 제1 BMS(21) 및 제2 BMS(21)로 칭하기로 한다.
[76]
상기 제1 BMS(21)는 제1 서브 모듈(100)(도 5 참조)의 충방전을 제어하고, 제2 BMS(21)는 제1 서브 모듈(100)에 인접한 제2 서브 모듈(100)(도 5 참조)의 충방전을 제어한다.
[77]
상기 BMS 프레임(22)은, 복수의 BMS(21)를 한꺼번에 감싸서 고정시키며, 배터리 모듈 어셈블리(10)(도 5 참조)의 길이 방향 일 측에 결합된다. 상기 BMS 프레임(22)은, 배터리 모듈 어셈블리(10)(도 5 참조)의 폭 방향(도 5의 Y축과 나란한 방향)을 따라 연장된 형태를 가지며, 배터리 모듈 어셈블리(10)의 폭과 대응되는 길이를 갖는다.
[78]
The BMS frame 22 may include a plurality of front fastening parts 22a, a plurality of second fastening accommodating parts 22b, a plurality of second fixing accommodating parts 22c, and a bus bar seating part 22d. .
[79]
The front fastening part 22a is provided at a position corresponding to the fastening protrusion 112a, and has a bolting hole H4. The bolting hole H4 formed in the front fastening part 22a is provided in a shape corresponding to a position corresponding to the bolting hole H1 formed in the lower housing 112 . Accordingly, one fastening bolt 4 (see FIGS. 1 and 2 ) can pass through the bolting hole H4 formed in the front fastening part 22a and the bolting hole H1 formed in the lower housing 112 at the same time. , whereby the battery module assembly 10 and the BMS assembly 20 may be coupled.
[80]
The second fastening receiving part 22b is provided in the form of a groove at a position corresponding to the front fastening part 22a and the fastening protrusion 112a. The second fastening accommodating part 22b has a shape corresponding to the fastening protrusion 112a, and accordingly, the fastening protrusion 112a is inserted into the second fastening receiving part 22b, so that the BMS assembly 20 and the battery module assembly (10) may be in close contact with each other.
[81]
The second fixing receiving portion 22c is provided in the form of a groove at a position corresponding to the fixing protrusion 112b. The second fixing accommodating portion 22c has a shape corresponding to the fixing protrusion 112b, and accordingly, the fixing protrusion 112b is inserted into the second fixing receiving portion 22c, and the BMS assembly 20 and the battery module assembly (10) may be in close contact with each other.
[82]
The bus bar seating part 22d is provided in the form of a groove on one side in the longitudinal direction of the BMS frame 22 . The bus bar seating portion 22d includes a pair of sub-packs 1 coupled to each other in a mirror-symmetrical form, and a serial bus bar 3 connecting the pair of sub-packs 1 in series. provide space. As shown in FIG. 15 , the pair of BMS assemblies 20 are coupled with each other in a mirror-symmetrical shape with respect to a central axis parallel to the width direction (parallel to the Y axis in FIG. 15 ) of the battery pack. The bus bar seating portions 22d provided in each of the pair of BMS assemblies 20 coupled as described above are connected to each other to provide a space in which the serial bus bar 3 can be mounted.
[83]
As such, the serial bus bar 3 seated on the bus bar seating part 22d connects between the parallel bus bars 114 provided at the outermost sides of each of the pair of sub packs 1 , and accordingly, the pair of The sub packs 1 are connected in series with each other. Electrical connection between the serial bus bar 3 and the parallel bus bar 114 is made by wire bonding using a connecting wire (W).
[84]
[85]
As described above, the battery pack according to an embodiment of the present invention has a structure in which a plurality of unit modules 110 can be simply fastened by bolting, as well as a plurality of unit modules 110 are coupled to each other. The coupling between the formed battery module assembly 10 and the BMS assembly 20 also has a structure that can be simply fastened by bolting.
[86]
That is, in the battery pack according to an embodiment of the present invention, as shown in FIGS. 1 and 2 , the fastening bolts 4 are bolted in a state where a pair of sub-packs 1 face each other in a mirror-symmetrical form. It has a structure in which the pair of sub packs 1 can be fastened by being inserted into the holes H1 to H4. In addition, in the battery pack according to an embodiment of the present invention, the fastening between the unit modules 110 constituting each sub-pack 1 and the battery module assembly 10 through the fastening between the pair of sub-packs 1 . ) and the fastening between the BMS assembly 20 has a structure that can also be made at the same time.
[87]
In addition, according to the battery pack according to an embodiment of the present invention, a plurality of unit modules 110 by using the parallel bus bar 114 and the serial bus bar 3 and applying wire bonding to the electrical connection between the components. They can simply create a mixture of series and parallel, so it is very easy to expand the capacity and output voltage as needed.
[88]
Meanwhile, a vehicle according to an embodiment of the present invention includes the battery pack according to the embodiment of the present invention as described above.
[89]
[90]
In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto and will be described below with the technical idea of ​​the present invention by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the scope of equivalents of the claims.

Claims

[Claim 1]
a battery module assembly including a plurality of unit modules; and a BMS assembly coupled to one side in a longitudinal direction of the battery module assembly, wherein the battery module assembly comprises: a first sub-module including a plurality of unit modules connected in a longitudinal direction; and a second sub-module including a plurality of unit modules, the second sub-module being connected to the first sub-module along a width direction of the unit module; wherein the BMS assembly comprises: a first BMS for controlling charging/discharging of the first sub-module; a second BMS for controlling charging/discharging of the second sub-module; and a BMS frame wrapped around the first BMS and the second BMS and fastened to one side in the longitudinal direction of the battery module assembly. A sub-pack comprising a.
[Claim 2]
The apparatus of claim 1 , wherein the unit module comprises: a plurality of battery cells forming a plurality of cell groups; a lower housing supporting the plurality of battery cells; an upper housing coupled to an upper portion of the lower housing and providing an accommodating space for the plurality of battery cells; and a plurality of parallel bus bars seated on the upper surface of the upper housing and spaced apart from each other and arranged side by side; A sub-pack comprising a.
[Claim 3]
The sub-pack according to claim 2, wherein the cell group includes a plurality of battery cells arranged along a length direction of the unit module.
[Claim 4]
The sub-pack according to claim 3, wherein battery cells included in the same cell group are connected in parallel through the parallel bus bar.
[Claim 5]
The plurality of unit modules included in the second sub-module according to claim 4, wherein the plurality of unit modules included in the first sub-module are connected in parallel by an electrical connection between parallel bus bars positioned on the same extension line, and the plurality of unit modules included in the second sub-module are connected in parallel. is a sub-pack, characterized in that it is connected in parallel by an electrical connection between parallel bus bars located on the same extension line.
[Claim 6]
The sub-pack according to claim 5, wherein the first sub-module and the second sub-module are connected in series to each other by an electrical connection between adjacent parallel bus bars.
[Claim 7]
The method of claim 6, wherein the parallel connection between the plurality of battery cells included in the same cell group, the parallel connection between the plurality of unit modules included in the same sub-module, and the series connection between the plurality of adjacent sub-modules are all performed by wire bonding. A sub pack, characterized in that made.
[Claim 8]
The apparatus of claim 2 , wherein the lower housing comprises: at least one fastening protrusion having a bolting hole and provided at one side in a longitudinal direction of the lower housing; at least one fixing protrusion having a fixing protrusion and provided on one side of the lower housing in the longitudinal direction; a first fastening receiving part provided on the other side in the longitudinal direction of the lower housing and having a shape corresponding to a position corresponding to the fastening protrusion; and a first fixing accommodating part provided on the other side of the lower housing in the longitudinal direction and having a shape corresponding to a position corresponding to the fixing protrusion. A sub-pack comprising a.
[Claim 9]
The apparatus of claim 8 , wherein the upper housing comprises: a bolting hole formed at a position corresponding to the first fastening receiving part; and a projection receiving groove formed at a position corresponding to the first fixing receiving portion and having a shape corresponding to the fixing projection; A sub-pack comprising a.
[Claim 10]
The apparatus of claim 8, wherein the BMS frame comprises: a plurality of front fastening parts provided at positions corresponding to the fastening protrusions and having bolting holes; a plurality of second fastening accommodating parts provided at positions corresponding to the front fastening part and the fastening protrusion; and a plurality of second fixing accommodating portions provided in shapes corresponding to positions corresponding to the fixing protrusions. A sub-pack comprising a.
[Claim 11]
The method of claim 2, wherein each of the first BMS and the second BMS includes a plurality of sensing terminals, and the sensing terminals of the first BMS are electrically connected to the parallel bus bar of the first sub-module by wire bonding, The sensing terminal of the second BMS is electrically connected to the parallel bus bar of the second sub-module by wire bonding.
[Claim 12]
A battery pack in which a pair of sub-packs according to claim 1 are coupled to each other in a mirror-symmetrical manner with respect to a central axis parallel to the longitudinal direction of the sub-pack.
[Claim 13]
The apparatus of claim 12 , further comprising: a serial bus bar configured to connect a pair of sub-packs in series and seated on the BMS frame; Battery pack, characterized in that it further comprises.
[Claim 14]
A motor vehicle comprising the battery pack according to claim 12 .