Battery module assembly

Abstract

A battery module assembly includes: a plurality of battery modules mounted in a lower portion of a frame, each battery module extending in a first direction and arranged in a second direction crossing the first direction; and a control circuit configured to control electrical connection between each of a plurality of battery modules and each of the first output terminal and the second output terminal, the plurality of battery modules including a first group of battery modules mounted in the lower portion of the frame and electrically connected to each other, and a second group of battery modules detachably installed in the lower portion of the frame and electrically connected to each other, and the second group of battery modules is connected in parallel to the first group of battery modules and is detachable from the frame in a third direction perpendicular to the first direction and the second direction.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0039397 filed on March 26, 2023, and Korean Patent Application No. 10-2023-0131907 filed on October 4, 2023, in the Korean Intellectual Property Office, the entire disclosure of each of which is incorporated herein by reference. Technical Field

[0003] Aspects of one or more embodiments are directed to battery module assemblies. Background Art

[0004] Secondary batteries are generally configured to be rechargeable and dischargeable multiple times, so they can be reused. Secondary batteries can be used as energy sources for devices such as mobile devices, electric vehicles, hybrid electric vehicles, electric bicycles, and uninterruptible power supplies. Depending on the type of external device using the secondary battery, a secondary battery of a single cell or a multi-cell secondary battery each including a plurality of cells connected to each other in one unit is used.

[0005] The above information disclosed in the Background section is only for enhancement of understanding of the background technology and therefore, the information discussed in this Background section does not necessarily constitute prior art. Utility Model Content

[0006] Aspects of one or more embodiments include a battery module assembly that can be used to adjust the capacity and weight of a battery according to situations and uses due to a configuration capable of easily attaching / detaching a portion of the battery module according to situations and uses.

[0007] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the embodiments presented in the disclosure.

[0008] According to one or more embodiments, a battery module assembly mounted on a frame and electrically connected to an external device through a first output terminal and a second output terminal includes: a plurality of battery modules mounted in a lower portion of the frame, each of the plurality of battery modules extending in a first direction and arranged in a second direction intersecting the first direction; and a control circuit configured to control the electrical connection between each of the plurality of battery modules and each of the first output terminal and the second output terminal, wherein the plurality of battery modules include: a first group of battery modules mounted in the lower portion of the frame and electrically connected to each other; and a second group of battery modules detachably mounted in the lower portion of the frame and electrically connected to each other, the second group of battery modules being connected in parallel to the first group of battery modules and being detachable from the frame in a third direction perpendicular to the first direction and the second direction.

[0009] According to one or more embodiments, a battery module assembly that provides an electrical output through a first output terminal and a second output terminal includes: a frame configured to accommodate a plurality of battery modules, each battery module extending in a first direction and arranged in a second direction intersecting the first direction; wherein the plurality of battery modules include: a first group of battery modules accommodated in a lower portion of the frame and electrically connected to each other; a second group of battery modules detachably accommodated in the lower portion of the frame and electrically connected to each other; a first control circuit configured to electrically control the connection between the positive terminal of the first group of battery modules and the first output terminal; a second control circuit configured to electrically control the connection between the negative terminal of the first group of battery modules and the second output terminal; a third control circuit configured to electrically control the connection between the positive terminal of the second group of battery modules and the first output terminal; and a fourth control circuit configured to electrically control the connection between the negative terminal of the second group of battery modules and the second output terminal, wherein the second group of battery modules is configured to be detachable from the frame in a third direction perpendicular to the first direction and the second direction.

[0010] According to some embodiments, the first set of battery modules may be configured to remain mounted on the frame.

[0011] According to some embodiments, the first direction may be a direction connecting the front and rear faces of the frame.

[0012] According to some embodiments, the third direction may be a direction from an upper portion to a lower portion of the frame.

[0013] According to some embodiments, the plurality of battery modules may be symmetrically arranged within the frame with respect to the first direction.

[0014] According to some embodiments, the battery modules of the first group may be spaced apart from each other by a certain distance, and the battery modules of the second group are located between the battery modules of the first group.

[0015] According to some embodiments, the second group of battery modules may be at a central position of the lower portion of the frame, and the first group of battery modules may be spaced apart from each other in the second direction at edge positions in the lower portion of the frame.

[0016] According to some embodiments, the battery module assembly may further include a bus bar electrically connected to the positive terminal or the negative terminal of each of the plurality of battery modules, the bus bar may include a first bus bar to a fourth bus bar, the first bus bar may be electrically connected to the first control circuit, the second bus bar may be electrically connected to the second control circuit, the third bus bar may be electrically connected to the third control circuit, and the fourth bus bar may be electrically connected to the fourth control circuit.

[0017] According to some embodiments, one of the positive terminal and the negative terminal of each of the plurality of battery modules may be at one end of the frame in the forward direction in the first direction in each of the plurality of battery modules, and the other of the positive terminal and the negative terminal may be at the other end of the frame in the backward direction in the first direction in each of the plurality of battery modules.

[0018] According to some embodiments, terminals at one end of the frame in the forward direction in each of a plurality of battery modules may be formed side by side in the second direction, terminals at the other end of the frame in the rearward direction in each of a plurality of battery modules may be formed side by side in the second direction, and the bus bars may further include a fifth bus bar and a sixth bus bar, the fifth bus bar may electrically connect the positive terminal and the negative terminal of the first group of battery modules among the terminals formed at the other end of the frame in the rearward direction, and the sixth bus bar may electrically connect the positive terminal and the negative terminal of the second group of battery modules among the terminals formed at the other end of the frame in the rearward direction.

[0019] According to some embodiments, the battery module assembly may further include a battery management unit housed inside the frame and configured to selectively disconnect and connect the first control circuit to the fourth control circuit according to the state of charge (SOC) of each of the first group of battery modules and the second group of battery modules.

[0020] According to some embodiments, if the first output terminal and the second output terminal each supply electrical energy to at least one of the multiple battery modules, the battery management unit may have a charging control state, and if at least one of the multiple battery modules supplies electrical energy to the outside through the first output terminal and the second output terminal, the battery management unit has a discharging control state.

[0021] According to some embodiments, in the charging control state, if the SOC value of the first group of battery modules is greater than the SOC value of the second group of battery modules, the battery management unit may disconnect the first control circuit and the second control circuit and short-circuit the third control circuit and the fourth control circuit, and if the SOC value of the second group of battery modules is greater than the SOC value of the first group of battery modules, the third control circuit and the fourth control circuit are disconnected and the first control circuit and the second control circuit are short-circuited.

[0022] According to some embodiments, in the discharge control state, if the SOC value of the second group of battery modules is greater than the SOC value of the first group of battery modules, the battery management unit may disconnect the first control circuit and the second control circuit and short-circuit the third control circuit and the fourth control circuit, and if the SOC value of the first group of battery modules is greater than the SOC value of the second group of battery modules, the third control circuit and the fourth control circuit are disconnected and the first control circuit and the second control circuit are short-circuited.

[0023] According to some embodiments, the battery management unit may disconnect and connect the first to fourth control circuits by wirelessly communicating with the first and second battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other aspects, features and characteristics of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a plan view illustrating a battery module assembly according to some embodiments;

[0026] Figure 2 is a front perspective view illustrating a battery module assembly according to some embodiments;

[0027] Figure 3 is a perspective view illustrating a battery module assembly in which a front frame is omitted according to some embodiments;

[0028] Figure 4 is a rear perspective view illustrating a battery module assembly according to some embodiments;

[0029] Figure 5 is a perspective view illustrating a battery module assembly in which a rear frame is omitted according to some embodiments;

[0030] Figure 6 An exploded perspective view of separating a second battery module according to some embodiments;

[0031] Figure 7 is a rear view of a battery module assembly with a protective cover removed therefrom according to some embodiments;

[0032] Figure 8is a bottom perspective view of a battery module assembly with a protective cover removed therefrom according to some embodiments;

[0033] Fig. 9 is an exploded perspective view of a battery module assembly with a protective cover removed therefrom according to some embodiments;

[0034] Fig.10 is an exploded perspective view of a battery module assembly with a protective cover removed therefrom, viewed from the bottom, to explain the connection between the battery module and the bus bar according to some embodiments;

[0035] Fig.11 is an exploded perspective view for explaining a bus bar and a connection terminal according to some embodiments;

[0036] Fig.12 is a flowchart illustrating a method for controlling charging of a battery module performed by a battery management unit according to some embodiments;

[0037] Fig.13 is a schematic diagram for explaining a control circuit according to some embodiments;

[0038] Fig.14 is a schematic diagram for explaining a first charging control state according to some embodiments;

[0039] Fig.15 is a schematic diagram for explaining a second charging control state according to some embodiments;

[0040] Fig.16 is a flowchart illustrating a method for controlling discharge of a battery module performed by a battery management unit according to some embodiments;

[0041] Fig.17 is a schematic diagram for explaining a first discharge control state according to some embodiments; and

[0042] Fig.18 is a schematic diagram for explaining a second discharge control state according to some embodiments. DETAILED DESCRIPTION

[0043] Reference will now be made in more detail to aspects of some embodiments illustrated in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this regard, the present embodiment may have different forms and should not be construed as being limited to the description set forth herein. Therefore, the embodiments are described below only by reference to the accompanying drawings to explain the various aspects of this specification. As used herein, the term "and / or" includes any and all combinations of one or more related enumerated items. When located before / after a list of elements, expressions such as "at least one of" modify the entire list of elements without modifying a single element in the list.

[0044] Hereinafter, a battery module assembly 1 will be described according to some embodiments with reference to the accompanying drawings.

[0045] Figure 1 FIG. 1 is a plan view illustrating a battery module assembly 1 according to some embodiments. Figure 2 1 is a front perspective view illustrating a battery module assembly 1 according to some embodiments.

[0046] refer to Figure 1 and Figure 2 According to some embodiments, the battery module assembly 1 may include a frame 2 , a battery module 4 and a battery management unit 7 .

[0047] According to some embodiments, the frame 2 may accommodate and protect the battery module 4. The frame 2 may be configured to accommodate the battery module 4. The frame 2 may accommodate and protect the battery management unit 7. The frame 2 may have a forward direction and a rearward direction. The direction from the back to the front of the frame 2 may be the x direction. The direction connecting the front and the back of the frame 2 may be the first direction (e.g., the x direction). The frame 2 may have an upward direction and a downward direction. The direction from the lower side to the upper side of the frame 2 may be the z direction. The battery module 4 may be assembled to the frame 2 by moving from the downward direction to the upward direction of the frame 2. However, the direction of the frame 2 is not limited to the above description. The battery module assembly 1 may not include the frame 2. For example, the battery module assembly 1 may be mounted on the frame 2.

[0048] The frame 2 according to some embodiments may include a front frame 21, a rear frame 22, a side frame 23, and a rib 24. The front frame 21 may protect the front surface of the frame 2 in front of the frame 2. The rear frame 22 may protect the rear surface of the frame 2 behind the frame 2. The side frame 23 may protect both sides of the frame 2. The side frame 23 may extend in the x direction. The rib 24 may support the frame 2 inside the frame 2. The rib 24 may support the side frame 23. The rib 24 may extend in the y direction and be connected to the side frame 23. The rib 24 may be located above the battery module 4. The frame 2 may include a plurality of ribs 24. However, the function and structure of the frame 2 are not limited to the above description.

[0049] The frame 2 may form the exterior of the battery module assembly 1. The frame 2 may support the battery module assembly 1. The frame 2 may be a vehicle body frame 2 forming a vehicle frame. The frame 2 may be a chassis of a vehicle. However, the function and use of the frame 2 are not limited to the above description. For example, the frame 2 may directly or indirectly cover the exterior of the battery module assembly 1.

[0050] The battery module 4 according to some embodiments may store electric energy. The battery module 4 may be accommodated in the lower portion of the frame 2. The battery module 4 may be located and fixed to the lower portion of the frame 2. The battery module 4 may be attached to the frame 2 and detachable from the frame 2. The battery module 4 may be coupled to the frame 2 from a downward direction to an upward direction. The battery module 4 may be separated from the frame 2 in the downward direction. However, the method of coupling the battery module 4 to the frame 2 or separating it from the frame 2 is not limited to the above description.

[0051] The battery module 4 may extend in the longitudinal direction. The battery module 4 may extend in the first direction. The battery module 4 may extend by using the first direction as the longitudinal direction. The first direction may be the direction of the front and rear of the connection frame 2. The first direction may be the x direction. However, the relationship between the first direction and the frame 2 and the shape of the battery module 4 are not limited to the above description. For example, the direction in which the battery module 4 extends may be perpendicular to the direction of the front and rear of the connection frame 2.

[0052] The battery module assembly 1 may include a plurality of battery modules 4. The plurality of battery modules 4 may be arranged side by side. Each of the plurality of battery modules 4 may be arranged in a second direction (e.g., a y direction). The second direction may intersect with the first direction. The second direction may form a certain angle with the first direction. The angle formed by the second direction and the first direction may be approximately a right angle. The second direction may be the y direction. However, the method of arranging the plurality of battery modules 4 and the specific definition of the second direction are not limited to the above description.

[0053] According to some embodiments, the battery module 4 may include a terminal configured to exchange electrical energy. The battery module 4 may include a positive terminal 41 (see Figure 3 and Figure 5 ) and the negative terminal 42 (see Figure 3 and Figure 5 ). One of the positive terminal 41 and the negative terminal 42 of the battery module 4 may be formed at one end of the battery module 4 in the forward direction of the frame 2 in the first direction. The other of the positive terminal 41 and the negative terminal 42 of the battery module 4 may be formed at the other end of the battery module 4 in the rearward direction of the frame 2 in the first direction. The positive terminal 41 and the negative terminal 42 of the battery module 4 may be located at both ends of the frame 2 in the forward direction and the rearward direction, respectively. However, the arrangement of the terminals of the battery module 4 is not limited to the above description. For example, the positive terminal 41 and the negative terminal 42 included in the battery module 4 may be positioned adjacent to each other at one end of the battery module 4.

[0054] The frame 2 according to some embodiments may include a support fixing portion 25. The support fixing portion 25 may play a role in supporting and fixing the battery module 4. The support fixing portion 25 may extend in the longitudinal direction in which the battery module 4 extends. The support fixing portion 25 may extend in the first direction. The middle portion of the support fixing portion 25 may be supported by the rib 24. The support fixing portion 25 may support each of the battery modules 4 on both sides. The support fixing portion 25 may support each of the battery modules 4 on both sides in the second direction. The support fixing portion 25 may extend in the longitudinal direction in which the battery module 4 extends. The frame 2 may include a plurality of support fixing portions 25. A plurality of support fixing portions 25 may be arranged side by side at a certain distance in the second direction. The support fixing portion 25 may be located between a plurality of battery modules 4 arranged in the second direction. The battery module 4 may be located between a plurality of support fixing portions 25 arranged in the second direction. However, the arrangement of the battery module 4 and the support fixing portion 25 is not limited to the above description.

[0055] According to some embodiments, a plurality of battery modules 4 may form a battery module group 400. The battery module group 400 may be a cluster formed by a plurality of battery modules 4 having similar purposes or functions. The battery module group 400 may include a first group of battery modules 410 and a second group of battery modules 420. However, the method of classifying or dividing the battery module group 400 is not limited to the above description.

[0056] The first battery module 410 according to some embodiments may be installed or accommodated in the lower portion of the frame 2. The first battery modules 410 may be electrically connected to each other. The plurality of battery modules 4 constituting the first battery module 410 may be connected in series to each other. However, the arrangement position and electrical connection method of the first battery module 410 are not limited to the above description.

[0057] The second battery module 420 according to some embodiments may be attached and detachably installed or accommodated in the lower portion of the frame 2. The second battery modules 420 may be electrically connected to each other. The plurality of battery modules 4 constituting the second battery module 420 may be connected in series to each other. However, the arrangement position and electrical connection method of the second battery module 420 are not limited to the above description.

[0058] The second group battery module 420 according to some embodiments may be connected in parallel to the first group battery module 410. For example, even if the second group battery module 420 is electrically connected to the first group battery module 410, the voltage supplied to the circuit electrically connected to the first group battery module 410 may not change. However, the method of connecting the first group battery module 410 to the second group battery module 420 is not limited to the above description.

[0059] Figure 3 is a perspective view of a battery module assembly 1 in which the front frame 21 is omitted according to some embodiments.

[0060] refer to Figure 2 and Figure 3 , the frame 2 according to some embodiments may accommodate the battery management unit 7. The front frame 21 may accommodate the battery management unit 7. The battery management unit 7 may be on the frame 2. However, the arrangement position of the battery management unit 7 is not limited to the above description.

[0061] According to some embodiments, the battery module assembly 1 may include a first output terminal 101 and a second output terminal 102. The first output terminal 101 and the second output terminal 102 may be electrically connected to a plurality of battery modules 4. The first output terminal 101 and the second output terminal 102 may provide electrical output to the outside of the battery module assembly 1. The first output terminal 101 and the second output terminal 102 may receive electrical output from the outside of the battery module assembly 1. The first output terminal 101 and the second output terminal 102 may be a channel for exchanging external electrical energy with the battery module assembly 1. However, the method of electrically connecting the battery module 4 to the first output terminal 101 and the second output terminal 102 is not limited to direct connection, but may also include indirect connection. The functions and effects of the first output terminal 101 and the second output terminal 102 are not limited to the above description.

[0062] The first output terminal 101 and the second output terminal 102 according to some embodiments may be electrically connected to an external device. The battery module assembly 1 may be mounted on the frame 2 and electrically connected to the external device through the first output terminal 101 and the second output terminal 102. The external device may be a device located outside the battery module 4. The external device may be accommodated in the frame 2. The external device may be mounted on the frame 2. The external device may be an electric device. For example, the external device may be an electric device such as an electric motor. The external device may be a device that supplies power to the battery module assembly 1. For example, the external device may be a power source. However, the role and type of the external device are not limited to the above description.

[0063] The battery management unit 7 according to some embodiments may control the electrical operation of the plurality of battery modules 4. The battery management unit 7 may include a first output terminal 101 and a second output terminal 102. The battery management unit 7 may control the electrical connection between the plurality of battery modules 4 and the first output terminal 101 and the second output terminal 102. The battery management unit 7 may control the electrical connection between the first group of battery modules 410 and the first output terminal 101 and the second output terminal 102. The battery management unit 7 may control the electrical connection between the second group of battery modules 420 and the first output terminal 101 and the second output terminal 102. However, the arrangement positions of the first output terminal 101 and the second output terminal 102 and the role of the battery management unit 7 are not limited to the above description.

[0064] The first output terminal 101 according to some embodiments may be a terminal connected to the positive terminal 41 of the battery module 4. The second output terminal 102 may be a terminal connected to the negative terminal 42 of the battery module 4. However, the method of electrically connecting the first output terminal 101 to the second output terminal 102 is not limited to the above description.

[0065] The battery module assembly 1 according to some embodiments may include a bus bar 6. The bus bar 6 may be used to transmit electrical energy. The bus bar 6 may electrically connect the battery module 4 to the battery management unit 7. The battery module assembly 1 may include a plurality of bus bars 6. The bus bar 6 may electrically connect the plurality of battery modules 4 to each other. The bus bar 6 may connect the plurality of battery modules 4 in series or in parallel. The bus bar 6 may be connected to one end of the battery module 4. The bus bar 6 may be electrically connected to the positive terminal 41 or the negative terminal 42 of each of the plurality of battery modules 4.

[0066] The bus bar 6 may be electrically connected to the positive terminal 41 or the negative terminal 42 of each of the first group of battery modules 410. The bus bar 6 may be electrically connected to the positive terminal 41 or the negative terminal 42 of each of the second group of battery modules 420. The bus bar 6 may electrically connect the positive terminal 41 of each of the plurality of battery modules 4 to the first output terminal 101. The bus bar 6 may electrically connect the negative terminal 42 of each of the plurality of battery modules 4 to the second output terminal 102. However, the method by which the bus bar 6 connects the terminals of the battery modules 4 to the first output terminal 101 and the second output terminal 102 is not limited to the above description.

[0067] The bus bar 6 according to some embodiments may include first to fourth bus bars 61 to 64. The first to fourth bus bars 61 to 64 may be located in the forward direction of the frame 2. The first bus bar 61 may electrically connect the positive terminal 41 of the first battery module 410 to the first output terminal 101. The second bus bar 62 may electrically connect the negative terminal 42 of the first battery module 410 to the second output terminal 102. The third bus bar 63 may electrically connect the positive terminal 41 of the second battery module 420 to the first output terminal 101. The fourth bus bar 64 may electrically connect the negative terminal 42 of the second battery module 420 to the second output terminal 102. However, the method of electrically connecting the bus bar 6 to the negative terminal 42 and the positive terminal 41 of the battery module 4, the first output terminal 101 and the second output terminal 102 is not limited to direct connection, and may also include indirect connection. The arrangement and function of the first to fourth bus bars 61 to 64 are not limited to the above description.

[0068] According to some embodiments, the first bus bar 61 and the second bus bar 62 may form an electrical connection between the first output terminal 101 and the second output terminal 102 and the first group of battery modules 410. The third bus bar 63 and the fourth bus bar 64 may form an electrical connection between the first output terminal 101 and the second output terminal 102 and the second group of battery modules 420. The first group of battery modules 410 and the second group of battery modules 420 may each be connected in parallel to the first output terminal 101 and the second output terminal 102. However, the connection structure of the bus bar 6 and the electrical connection relationship between the first group of battery modules 410 and the second group of battery modules 420 are not limited to the above description.

[0069] Figure 4 1 is a rear perspective view illustrating a battery module assembly 1 according to some embodiments. Figure 5 is a perspective view illustrating a battery module assembly 1 in which the rear frame 22 is omitted according to some embodiments.

[0070] refer to Figure 3 to Figure 5 According to some embodiments, in each of the plurality of battery modules 4, a terminal may be formed at one end of the frame 2 in the forward direction. In each of the plurality of battery modules 4, a terminal may be formed at the other end of the frame 2 in the rearward direction. The terminals formed at one end of the frame 2 in the forward direction in each of the plurality of battery modules 4 may be arranged side by side in the second direction. The terminals formed at the other end of the frame 2 in the rearward direction in each of the plurality of battery modules 4 may be arranged side by side in the second direction. However, the arrangement of the terminals of the plurality of battery modules 4 is not limited to the above description.

[0071] The first group battery module 410 according to some embodiments may have the positive terminal 41 and the negative terminal 42 arranged side by side in the second direction in the rearward direction of the frame 2. The second group battery module 420 may have the positive terminal 41 and the negative terminal 42 arranged side by side in the second direction in the rearward direction of the frame 2. However, the arrangement of the positive terminal 41 and the negative terminal 42 of each of the first group battery module 410 and the second group battery module 420 is not limited to the above description.

[0072] The bus bar 6 according to some embodiments may further include a fifth bus bar 65 and a sixth bus bar 66. The fifth bus bar 65 and the sixth bus bar 66 may be arranged in the rearward direction of the frame 2. The fifth bus bar 65 may electrically connect the positive terminal 41 and the negative terminal 42 of the first battery module 410 to each other. In the terminal formed at the other end of the frame 2 in the rearward direction, the fifth bus bar 65 may electrically connect the positive terminal 41 and the negative terminal 42 of the first battery module 410 to each other. The sixth bus bar 66 may electrically connect the positive terminal 41 and the negative terminal 42 of the second battery module 420 to each other. In the terminal formed at the other end of the frame 2 in the rearward direction, the sixth bus bar 66 may electrically connect the positive terminal 41 and the negative terminal 42 of the second battery module 420 to each other. However, the arrangement and function of the fifth bus bar 65 and the sixth bus bar 66 are not limited to the above description.

[0073] According to some embodiments, the battery modules 4 constituting the first battery module group 410 may have a series connection direction through the fifth bus bar 65. The battery modules 4 constituting the second battery module group 420 may have a series connection direction through the sixth bus bar 66. However, the connection structure of the bus bar 6 and the electrical connection relationship of the battery modules 4 constituting the first battery module group 410 and the second battery module group 420 are not limited to the above description.

[0074] The battery module assembly 1 according to some embodiments may include a protective cover 10. The protective cover 10 may play a role in protecting the lower portion of the battery module 4. The protective cover 10 may play a role in protecting the lower portion of the frame 2. The protective cover 10 may be fixed to the lower portion of the frame 2. The protective cover 10 may be arranged across the lower portion of the battery module 4. However, the function and role of the protective cover 10 are not limited to the above description.

[0075] Figure 6 FIG. 4 is an exploded perspective view of a separated second battery module 420 according to some embodiments.

[0076] refer to Figure 6 , the battery module assembly 1 according to some embodiments may attach and detach the second battery module 420. The battery module assembly 1 may detach the second battery module 420 in the vertical direction. The battery module assembly 1 may detach the second battery module 420 in a third direction perpendicular to the first direction and the second direction. The battery module assembly 1 may detach the second battery module 420 in a direction from the upper portion to the lower portion of the frame 2. However, the direction in which the second battery module 420 is detached from the battery module assembly 1 is not limited to the above description.

[0077] Figure 7 FIG. 1 is a rear view of the battery module assembly 1 with the protective cover 10 removed therefrom according to some embodiments.

[0078] refer to Figure 6 and Figure 7 According to some embodiments, the battery module 4 may include a fastening flange 461. The fastening flange 461 may play a role in fixing the battery module 4 to the lower portion of the frame 2. The fastening flange 461 may protrude from one end of the battery module 4. The fastening flange 461 may protrude from an end of the battery module 4 adjacent to the supporting and fixing portion 25 in a direction toward the supporting and fixing portion 25. The fastening flange 461 may protrude from an end of the battery module 4 in a direction overlapping with the supporting and fixing portion 25 in the up-down direction. The fastening flange 461 may protrude from a side surface of the battery module 4 in the second direction. However, the configuration and function of the fastening flange 461 are not limited to the above description.

[0079] According to some embodiments, the battery module 4 may include a plurality of fastening flanges 461. The plurality of fastening flanges 461 may be formed in a first direction. The plurality of fastening flanges 461 may be formed at a certain distance in the first direction. The fastening flanges 461 may be independently located on both sides of the battery module 4. The fastening flanges 461 may be located on both sides of the battery module 4 in the second direction. The two sides of the battery module 4 may be positions where the battery module 4 is opposite to the support fixing portion 25. The plurality of fastening flanges 461 may be formed on both sides of the battery module 4 at a certain distance in the first direction. However, the function and arrangement of the fastening flanges 461 are not limited to the above description.

[0080] The battery module assembly 1 according to some embodiments may include a fixing member 48 fixing the battery module 4 to the frame 2. The fixing member 48 may fix the battery module 4 to the frame 2. The fixing member 48 may fix the battery module 4 to the support fixing portion 25. The fixing member 48 may be inserted into the insertion hole 4610 of the fastening flange 461. The fixing member 48 may be fixed to the fastening flange 461. The fixing member 48 may be fastened in a direction from the lower portion to the upper portion of the frame 2. However, the method of fixing the battery module 4 to the frame 2 is not limited thereto.

[0081] The support fixing portion 25 of the frame 2 according to some embodiments may include a fastening hole 250. The fastening hole 250 may accommodate and fix the fixing member 48. The fixing member 48 may be inserted into the fastening hole 250 and fixed to the fastening hole 250. The fixing member 48 may be inserted into the fastening hole 250 of the support fixing portion 25 in the direction from the lower portion to the upper portion of the frame 2. The fastening hole 250 may be concentric with the insertion hole 4610 of the fastening flange 461. The fixing member 48 may be inserted into the insertion hole 4610 of the fastening flange 461 and fixed to the fastening hole 250 of the support fixing portion 25. The fixing member 48 may pass through the fastening flange 461 in the lower portion and be accommodated in the support fixing portion 25. The fixing member 48 may include, but is not limited to, screws, bolts, rivets, etc.

[0082] Figure 8is a bottom perspective view of the battery module assembly 1 with the protective cover 10 removed therefrom according to some embodiments. Fig. 9 is an exploded perspective view of the battery module assembly 1 with the protective cover 10 removed therefrom according to some embodiments.

[0083] refer to Figure 8 and Fig. 9 , the battery module assembly 1 according to some embodiments can disassemble the second group battery module 420 by removing the fixing member 48. The battery module assembly 1 can disassemble the second group battery module 420 by removing the fixing member 48 attached to the fastening flange 461 of the second group battery module 420. However, the method of disassembling the second group battery module 420 is not limited to the above description.

[0084] The battery module assembly 1 according to some embodiments may keep the first battery module 410 mounted on the frame 2 and remove the second battery module 420 from the frame 2. The second battery module 420 may be configured to be independently separated from the first battery module 410 on the frame 2. If the second battery module 420 is detachable from the frame 2 when the first battery module 410 is mounted on the frame 2, the second battery module 420 may be easily detached from the frame 2. If the second battery module 420 is detachable from the frame 2 when the first battery module 410 is mounted on the frame 2, the power supplied to the outside by the battery module assembly 1 may be maintained even during the disassembly. However, the advantages of detaching the second battery module 420 from the frame 2 when the first battery module 410 is mounted on the frame 2 are not limited to the above description.

[0085] If the second battery module 420 according to some embodiments is disassembled, the weight of the battery module assembly 1 can be reduced. Even if the second battery module 420 is disassembled, the electrical output provided by the battery module assembly 1 can be the same as when the second battery module 420 is installed. Even if the second battery module 420 is disassembled, the electrical output provided by the battery module assembly 1 is not reduced. However, the advantages of disassembling the second battery module 420 are not limited to the above description.

[0086] The second battery module 420 according to some embodiments may be installed again after the second battery module 420 is disassembled. The second battery module 420 may be installed on the frame 2 by the fixing member 48. If the second battery module 420 is installed on the battery module assembly 1, the total amount of electric energy stored in the battery module assembly 1 may be increased. However, the advantages of installing the second battery module 420 are not limited to the above description.

[0087] The battery module assembly 1 according to some embodiments may determine whether to attach or detach the second battery module 420 according to the purpose of use. The battery module assembly 1 may determine the attachment and detachment of the second battery module 420 by considering the weight and the electric energy storage capacity. For example, if the battery module assembly 1 is used as a vehicle battery, the second battery module 420 may be detached to reduce the weight of the battery module assembly 1 during city driving. For example, if the battery module assembly 1 is used as a vehicle battery, the second battery module 420 may be installed to increase the electric energy storage capacity of the battery module assembly 1 during long-distance driving. However, the decision method for attaching and detaching the second battery module 420 is not limited to the above description.

[0088] refer to Figures 1 to 9 , the plurality of battery modules 4 included in the battery module assembly 1 according to some embodiments may be arranged symmetrically with respect to the first direction within the frame 2. If the plurality of battery modules 4 are arranged symmetrically with respect to the first direction within the frame 2, the center of gravity of the battery module assembly 1 may be uniform in the second direction. However, the arrangement of the plurality of battery modules 4 is not limited to the above description.

[0089] According to some embodiments, the first battery modules 410 may be spaced apart from each other by a certain distance, and the second battery module 420 may be located therebetween. If the first battery modules 410 are spaced apart from each other by a certain distance, and the second battery module 420 is located therebetween, the moment of inertia of the battery module assembly 1 in the third direction may not be large. If the first battery modules 410 are spaced apart from each other by a certain distance, and the second battery module 420 is located therebetween, even if the second battery module 420 is disassembled, the deflection movement of the battery module assembly 1 in the third direction will not be too large. If the first battery modules 410 are spaced apart from each other by a certain distance, and the second battery module 420 is located therebetween, the moment of inertia of the battery module assembly 1 in the second direction may not be large. If the first battery modules 410 are spaced apart from each other by a certain distance, and the second battery module 420 is located therebetween, even if the second battery module 420 is disassembled, the rolling movement of the battery module assembly 1 in the second direction will not be too large.

[0090] According to some embodiments, the second battery module 420 may be located at a central position in the lower portion of the frame 2, and the first battery module 410 may be located at an edge position in the lower portion of the frame 2 in the second direction. If the first battery module 410 is located at an edge position in the lower portion of the frame 2 in the second direction, even if the second battery module 420 is disassembled, the deflection movement of the battery module assembly 1 in the third direction will not be too large. If the first battery module 410 is located at an edge position in the lower portion of the frame 2 in the second direction, the moment of inertia of the battery module assembly 1 in the second direction may not be large. If the first battery module 410 is located at an edge position in the lower portion of the frame 2 in the second direction, even if the second battery module 420 is disassembled, the rolling movement of the battery module assembly 1 in the second direction will not be too large.

[0091] Fig.10 is an exploded perspective view of the battery module assembly 1 with the protection cover 10 removed therefrom, viewed from the bottom, to explain the connection between the battery module 4 and the bus bar 6 according to some embodiments.

[0092] refer to Figure 3 , Figure 5 , Fig. 9 and Fig.10 , according to some embodiments, the bus bar 6 can be attached to and detached from the battery module 4 from the downward direction to the upward direction. The bus bar 6 may be a quick-connect bus bar 6 that can be quickly attached to and detached from the terminal of the battery module 4 or the bus bar accommodating portion 60 of the battery management unit 7. If the bus bar 6 is attached to and detached from the terminal of the battery module 4 or the bus bar accommodating portion 60 of the battery management unit 7, no additional components are required. If the bus bar 6 is quickly attached to and detached from the terminal of the battery module 4 or the bus bar accommodating portion 60 of the battery management unit 7, the second group of battery modules 420 can be easily detached from the battery module assembly 1. If the bus bar 6 is quickly attached to and detached from the terminal of the battery module 4 or the bus bar accommodating portion 60 of the battery management unit 7, the second group of battery modules 420 can be easily installed on the battery module assembly 1 again. However, the specific method of attaching and detaching the bus bar 6 is not limited to the above description.

[0093] Fig.11 1 is an exploded perspective view for explaining the bus bar 6 and the connection terminals according to some embodiments.

[0094] refer to Fig.10 and Fig.11, the connection terminal according to some embodiments may receive one end of the bus bar 6. The connection terminal may be electrically connected to the bus bar 6. The connection terminal may be a concept including all of the positive terminal 41, the negative terminal 42, and the bus bar accommodating portion 60 of the battery module 4. The connection terminal may be located in the battery module 4 and / or the battery management unit 7. However, the arrangement and function of the connection terminal are not limited to the above description.

[0095] The bus bar 6 may include a mounting protrusion 601 on a side surface of one end connected to a connecting terminal. The bus bar 6 may include a plurality of mounting protrusions 601. The connecting terminal may include a receiving portion groove corresponding to the mounting protrusion 601. The connecting terminal may include a plurality of receiving portion grooves. The mounting protrusion 601 and the receiving portion groove may guide the direction in which the bus bar 6 is connected. For example, the mounting protrusion 601 and the receiving portion groove may guide a specific end of the bus bar 6 to be connected to a specific connecting terminal. For example, the mounting protrusion 601 and the receiving portion groove may serve to indicate a specific connecting terminal to be connected to a specific end of the bus bar 6. However, the functions and effects of the mounting protrusion 601 and the receiving portion groove are not limited to the above description.

[0096] Fig.12 2 is a flowchart illustrating a method of controlling the battery module 4 executed by the battery management unit 7 according to some embodiments. Fig.13 Schematic diagram for explaining first to fourth control circuits 81 ˜ 84 according to some embodiments.

[0097] refer to Figure 1 , Figure 3 , Figure 5 , Fig.12 and Fig.13 According to some embodiments, the battery module assembly 1 may include first to fourth control circuits 81 to 84. The first control circuit 81 may electrically control the connection between the positive terminal 41 of the first battery module 410 and the first output terminal 101. The second control circuit 82 may electrically control the connection between the negative terminal 42 of the first battery module 410 and the second output terminal 102. The third control circuit 83 may electrically control the connection between the positive terminal 41 of the second battery module 420 and the first output terminal 101. The fourth control circuit 84 may electrically control the connection between the negative terminal 42 of the second battery module 420 and the second output terminal 102. However, the functions of the first to fourth control circuits 81 to 84 are not limited to the above description.

[0098] According to some embodiments, the first bus bar 61 may be electrically connected to the first control circuit 81. The second bus bar 62 may be electrically connected to the second control circuit 82. The third bus bar 63 may be electrically connected to the third control circuit 83. The fourth bus bar 64 may be electrically connected to the fourth control circuit 84. However, the electrical connection between the bus bar 6 and the control circuit is not limited to the above description.

[0099] According to some embodiments, the first to fourth control circuits 81 to 84 controlling the electrical connection between the terminal and the output terminal of the battery module 4 may mean controlling the electrical connection between the bus bar 6 and the battery module 4. The first to fourth control circuits 81 to 84 controlling the electrical connection between the terminal and the output terminal of the battery module 4 may mean controlling the electrical connection between the bus bar 6 and the output terminal. However, the method of controlling the electrical connection performed by the first to fourth control circuits 81 to 84 is not limited to the above description.

[0100] According to some embodiments, the battery management unit 7 may control a plurality of battery modules 4. The battery management unit 7 controlling the plurality of battery modules 4 may mean selecting a battery module from among the plurality of battery modules 4 to supply power. The battery management unit 7 controlling the plurality of battery modules 4 may mean selecting a battery module to supply power from among the plurality of battery modules 4. The battery management unit 7 may be electrically connected to the battery module 4. The battery management unit 7 may receive power from the battery module 4.

[0101] According to some embodiments, the battery management unit 7 may selectively disconnect the first to fourth control circuits 81 to 84. The battery management unit 7 may selectively short-circuit the first to fourth control circuits 81 to 84. The battery management unit 7 may selectively disconnect and connect the first to fourth control circuits 81 to 84. The battery management unit 7 selectively disconnecting and connecting the first to fourth control circuits 81 to 84 may mean selecting a battery module from among a plurality of battery modules 4 to supply power. The battery management unit 7 selectively disconnecting and connecting the first to fourth control circuits 81 to 84 may mean selecting a battery module to be supplied power from among a plurality of battery modules 4.

[0102] The battery management unit 7 may receive information about the state of charge (SOC) of each of the plurality of battery modules 4. The battery management unit 7 may receive information about the SOC of each of the first battery module 410 and the second battery module 420. The battery management unit 7 may selectively disconnect and connect the first to fourth control circuits 81 to 84 according to the SOC of each of the first battery module 410 and the second battery module 420.

[0103] The battery management unit 7 may communicate wirelessly with a plurality of battery modules 4. The battery module 4 may include a module control unit 75. The module control unit 75 may be a battery management module (BMM). The battery management unit 7 may be a battery management system (BMS). The battery management unit 7 may communicate with the module control unit 75 of the battery module 4. The battery management unit 7 and the module control unit 75 may communicate via a daisy chain method. However, the method of communicating with the battery module 4 performed by the battery management unit 7 is not limited to the above description.

[0104] The battery management unit 7 may wirelessly communicate with the first battery module 410 and the second battery module 420. The battery management unit 7 may wirelessly receive information about the SOC of each of the first battery module 410 and the second battery module 420. The battery management unit 7 may disconnect and connect the first to fourth control circuits 81 to 84 by wirelessly communicating with the first battery module 410 and the second battery module 420. If a plurality of battery modules 4 are charged or discharged, the battery management unit 7 may select a battery module to be charged or discharged by using the information about the SOC of each of the first battery module 410 and the second battery module 420.

[0105] The battery management unit 7 may wirelessly receive information about the attachment and detachment of the second battery module 420. If the second battery module 420 is detached, the battery management unit 7 may determine that the second battery module 420 is not electrically connected to the first output terminal 101 and the second output terminal 102. If the second battery module 420 is detached, the battery management unit 7 may not operate the cooling channel for cooling the second battery module 420.

[0106] refer to Fig.12 and Fig.13 According to some embodiments, the battery module assembly 1 may have a charging control state 77. The charging control state 77 may be a state in which the battery management unit 7 controls the charging of the plurality of battery modules 4. The charging control state 77 may be a state in which the battery management unit 7 controls the charging between the first battery module 410 and the second battery module 420.

[0107] According to some embodiments, in order to properly manage the battery module group 400 , a long life of the battery module 4 may be maintained by adjusting the SOC of the battery module group 400 to prevent the first battery module 410 and the second battery module 420 from being overcharged.

[0108] The battery management unit 7 may compare the SOC value of the first battery module 410 with the SOC value of the second battery module 420. If the SOC value of the first battery module 410 and the SOC value of the second battery module 420 are the same, the battery management unit 7 may charge the first battery module 410 and the second battery module 420 simultaneously by short-circuiting the first to fourth control circuits 81-84.

[0109] Fig.14 is a schematic diagram for explaining a first charging control state 771 according to some embodiments.

[0110] refer to Figure 8 , Fig. 9 and Figure 12 to Figure 14, the battery module assembly 1 may have a first charging control state 771. If the second battery module 420 according to some embodiments is mounted on the battery module assembly 1, the SOC of the first battery module 410 and the SOC of the second battery module 420 may be different from each other. The first charging control state 771 may be a state in which the SOC value of the first battery module 410 is lower than the SOC value of the second battery module 420 if the battery management unit 7 controls the charging between the first battery module 410 and the second battery module 420. In the first charging control state 771, the battery management unit 7 may short-circuit the first control circuit 81 and the second control circuit 82 and disconnect the third control circuit 83 and the fourth control circuit 84. In the first charging control state 771, the first control circuit 81 and the second control circuit 82 may be in a short-circuit state 88, and the third control circuit 83 and the fourth control circuit 84 may be in a disconnected state 87. In the first charging control state 771 , the battery management unit 7 may use electric energy to charge the first battery module 410 but not to charge the second battery module 420 .

[0111] Fig.15 is a schematic diagram illustrating the second charging control state 772 according to some embodiments.

[0112] refer to Figure 8 , Fig. 9 , Fig.12 and Fig.15 , the battery module assembly 1 may have a second charge control state 772. If the second battery module 420 according to some embodiments is mounted on the battery module assembly 1, the SOC of the first battery module 410 and the SOC of the second battery module 420 may be different from each other. The second charge control state 772 may be a state in which the SOC value of the first battery module 410 is greater than the SOC value of the second battery module 420 if the battery management unit 7 controls the charging between the first battery module 410 and the second battery module 420. In the second charge control state 772, the battery management unit 7 may disconnect the first control circuit 81 and the second control circuit 82 and short the third control circuit 83 and the fourth control circuit 84. In the second charge control state 772, the first control circuit 81 and the second control circuit 82 may be in a disconnected state 87, and the third control circuit 83 and the fourth control circuit 84 may be in a shorted state 88. In the second charging control state 772 , the battery management unit 7 can use electric energy to charge the second battery module 420 but not to charge the first battery module 410 .

[0113] Fig.16 2 is a flowchart illustrating a method for controlling the discharge of the battery module 4 executed by the battery management unit 7 according to some embodiments.

[0114] refer to Fig.13 and Fig.16 According to some embodiments, the battery module assembly 1 may have a discharge control state 78. The discharge control state 78 may be a state in which the battery management unit 7 controls the discharge of each of the plurality of battery modules 4. The discharge control state 78 may be a state in which the battery management unit 7 controls the discharge between the first battery module 410 and the second battery module 420.

[0115] According to some embodiments, in order to properly manage the battery module group 400 , a long life of the battery module 4 may be maintained by adjusting the SOC of the battery module group 400 to prevent the first battery module 410 and the second battery module 420 from being over-discharged.

[0116] The battery management unit 7 may compare the SOC value of the first battery module 410 with the SOC value of the second battery module 420. If the SOC value of the first battery module 410 and the SOC value of the second battery module 420 are the same, the battery management unit 7 may discharge the first battery module 410 and the second battery module 420 simultaneously by short-circuiting the first to fourth control circuits 81 to 84.

[0117] Fig.17 is a schematic diagram illustrating a first discharge control state 781 according to some embodiments.

[0118] refer to Figure 8 , Fig. 9 , Fig.16 and Fig.17 , the battery module assembly 1 may have a first discharge control state 781. If the second battery module 420 according to some embodiments is mounted on the battery module assembly 1, the SOC of the first battery module 410 and the SOC of the second battery module 420 may be different from each other. The first discharge control state 781 may be a state in which the SOC value of the first battery module 410 is lower than the SOC value of the second battery module 420 if the battery management unit 7 controls the discharge between the first battery module 410 and the second battery module 420. In the first discharge control state 781, the battery management unit 7 may disconnect the first control circuit 81 and the second control circuit 82 and short the third control circuit 83 and the fourth control circuit 84. In the first discharge control state 781, the first control circuit 81 and the second control circuit 82 may be in a disconnected state 87, and the third control circuit 83 and the fourth control circuit 84 may be in a shorted state 88. In the first discharge control state 781 , the battery management unit 7 may release electric energy from the second group of battery modules 420 without discharging the first group of battery modules 410 .

[0119] Fig.18 is a schematic diagram illustrating the second discharge control state 782 according to some embodiments.

[0120] refer to Figure 8 , Fig. 9 , Fig.16 and Fig.18 , the battery module assembly 1 may have a second discharge control state 782. If the second battery module 420 according to some embodiments is mounted on the battery module assembly 1, the SOC of the first battery module 410 and the SOC of the second battery module 420 may be different from each other. The second discharge control state 782 may be a state in which the SOC value of the first battery module 410 is greater than the SOC value of the second battery module 420 if the battery management unit 7 controls the discharge between the first battery module 410 and the second battery module 420. In the second discharge control state 782, the battery management unit 7 may short-circuit the first control circuit 81 and the second control circuit 82 and disconnect the third control circuit 83 and the fourth control circuit 84. In the second discharge control state 782, the first control circuit 81 and the second control circuit 82 may be in a short-circuit state 88, and the third control circuit 83 and the fourth control circuit 84 may be in a disconnected state 87. In the second discharge control state 782 , the battery management unit 7 may release electric energy from the first group of battery modules 410 without discharging the second group of battery modules 420 .

[0121] However, the method of controlling the discharge of the plurality of battery modules 4 performed by the battery management unit 7 is not limited to the above description. For example, the battery management unit 7 may control the charge and discharge of the plurality of battery modules 4 based on the internal temperature information of each of the plurality of battery modules 4.

[0122] The battery module assembly according to some embodiments provides a structure capable of easily disassembling the second group of battery modules, and thus, a user can select a balance between the capacity and weight of the battery.

[0123] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. The description of features or aspects in each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the claims.

Claims

1. A battery module assembly, mounted on a frame and electrically connected to an external device through a first output terminal and a second output terminal, characterized in that: The battery module assembly comprises: a plurality of battery modules mounted in a lower portion of the frame, each of the plurality of battery modules extending in a first direction and arranged in a second direction intersecting the first direction; and a control circuit configured to control electrical connection between each of the plurality of battery modules and each of the first output terminal and the second output terminal, The plurality of battery modules include: a first group of battery modules mounted in the lower portion of the frame and electrically connected to each other; and a second group of battery modules, detachably mounted in the lower portion of the frame and electrically connected to each other, The second group of battery modules is connected in parallel to the first group of battery modules and is detachable from the frame in a third direction perpendicular to the first direction and the second direction.

2. The battery module assembly according to claim 1, characterized in that: The second group of battery modules is mounted on the frame so as to be independently separated from the first group of battery modules, so that the first group of battery modules remains mounted on the frame and the second group of battery modules is detachable from the frame.

3. The battery module assembly according to claim 1, characterized in that: The control circuit comprises: a first control circuit configured to electrically control a connection between a positive terminal of the first battery module and the first output terminal; a second control circuit configured to electrically control the connection between the negative terminal of the first battery module group and the second output terminal; a third control circuit configured to electrically control the connection between the positive terminal of the second group of battery modules and the first output terminal; and The fourth control circuit is configured to electrically control the connection between the negative terminal of the second battery module group and the second output terminal.

4. A battery module assembly, providing electrical output through a first output terminal and a second output terminal, characterized in that: The battery module assembly comprises: a frame configured to accommodate a plurality of battery modules, each battery module extending in a first direction and arranged in a second direction intersecting the first direction; The plurality of battery modules include: a first group of battery modules housed in the lower portion of the frame and electrically connected to each other; a second group of battery modules detachably received in the lower portion of the frame and electrically connected to each other; a first control circuit configured to electrically control a connection between a positive terminal of the first battery module and the first output terminal; a second control circuit configured to electrically control the connection between the negative terminal of the first battery module group and the second output terminal; a third control circuit configured to electrically control the connection between the positive terminal of the second group of battery modules and the first output terminal; and a fourth control circuit configured to electrically control the connection between the negative terminal of the second battery module and the second output terminal, The second battery module is configured to be detachable from the frame in a third direction perpendicular to the first direction and the second direction.

5. The battery module assembly according to claim 4, characterized in that: The first group of battery modules is configured to remain mounted on the frame.

6. The battery module assembly according to claim 4, characterized in that: The plurality of battery modules are symmetrically arranged within the frame relative to the first direction.

7. The battery module assembly according to claim 4, characterized in that: The second battery module is centrally located in the lower portion of the frame, and The edge positions of the first group of battery modules in the lower portion of the frame are spaced apart from each other by a certain distance in the second direction, and the second group of battery modules are located between the first group of battery modules.

8. The battery module assembly according to claim 4, characterized in that: The battery module assembly further includes: a bus bar electrically connected to a positive terminal or a negative terminal of each of the plurality of battery modules, The busbars include first to fourth busbars, The first bus bar is electrically connected to the first control circuit, The second bus bar is electrically connected to the second control circuit, The third bus bar is electrically connected to the third control circuit, and The fourth bus bar is electrically connected to the fourth control circuit.

9. The battery module assembly according to claim 8, characterized in that: One of the positive terminal and the negative terminal of each of the plurality of battery modules is at one end of the frame in a forward direction in the first direction in each of the plurality of battery modules, and The other of the positive terminal and the negative terminal is at the other end of the frame in the rearward direction in the first direction in each of the plurality of battery modules.

10. The battery module assembly according to claim 9, characterized in that: terminals at the one end of the frame in the forward direction in each of the plurality of battery modules are arranged side by side in the second direction, the terminals at the other end of the frame in the rearward direction in each of the plurality of battery modules are arranged side by side in the second direction, The bus bar further includes a fifth bus bar and a sixth bus bar, The fifth bus bar is configured to electrically connect the positive electrode terminal and the negative electrode terminal of the first group of battery modules among the terminals at the other end of the frame in the rearward direction, and The sixth bus bar is configured to electrically connect the positive electrode terminal and the negative electrode terminal of the second group of battery modules among the terminals at the other end of the frame in the rearward direction.

11. The battery module assembly according to claim 4, characterized in that: The battery module assembly further includes: a battery management unit on the frame and configured to selectively disconnect and connect the first control circuit to the fourth control circuit according to a charging state of each of the first group of battery modules and the second group of battery modules.

12. The battery module assembly according to claim 11, characterized in that: If the first output terminal and the second output terminal each supply electric energy to at least one of the plurality of battery modules, the battery management unit has a charge control state, and If at least one of the plurality of battery modules supplies electric energy to the outside through the first output terminal and the second output terminal, the battery management unit has a discharge control state.

13. The battery module assembly according to claim 12, characterized in that: In the charging control state, the battery management unit is configured as follows: If the state of charge value of the first battery module group is greater than the state of charge value of the second battery module group, disconnecting the first control circuit and the second control circuit and short-circuiting the third control circuit and the fourth control circuit; and If the state of charge value of the second battery module group is greater than the state of charge value of the first battery module group, the third control circuit and the fourth control circuit are disconnected and the first control circuit and the second control circuit are short-circuited.

14. The battery module assembly according to claim 12, characterized in that: In the discharge control state, the battery management unit is configured as follows: If the state of charge value of the second battery module group is greater than the state of charge value of the first battery module group, disconnect the first control circuit and the second control circuit and short-circuit the third control circuit and the fourth control circuit; and If the state of charge value of the first battery module group is greater than the state of charge value of the second battery module group, the third control circuit and the fourth control circuit are disconnected and the first control circuit and the second control circuit are short-circuited.

15. The battery module assembly according to claim 11, characterized in that: The battery management unit is configured to disconnect and connect the first control circuit to the fourth control circuit by wirelessly communicating with the first group of battery modules and the second group of battery modules.

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