Connecting member, cell module, and energy storage battery pack

Abstract

To provide, in the field of energy storage, a connection member, a cell module, and an energy storage battery pack.SOLUTION: The connection member is used to electrically connect output terminals of two cell groups, and includes a body portion having a first side and a second side disposed opposite to each other, a first bent portion, a second bent portion, a first connection portion, and a second connection portion. The first bent portion is bent back in a second direction at the first side, and the second bent portion is bent back in the second direction at the second side. The first connection portion is located at an end of the first bent portion away from the body portion, and is bent along a third direction from the first bent portion, the third direction being a direction from the second side toward the first side. The second connection portion is located at an end of the second bent portion away from the body portion, and is bent along a fourth direction from the second bent portion, the fourth direction being a direction from the first side toward the second side. The connection member according to the present embodiment can improve at least the integration level of the cell module itself.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present embodiments relate to the field of energy storage, and in particular to connecting members, cell modules and energy storage battery packs. [Background technology]

[0002] In conventional technology, multiple cell groups are typically combined into a single cell module, then the multiple cell modules are mounted in a series-parallel configuration inside a battery pack, electrical components and structural fixing components are then attached, and finally the battery pack is mounted in a battery holder to form a battery cluster, thereby forming an energy storage system.

[0003] Typically, cell modules are assembled within a battery pack, and the cell modules are electrically connected to each other using copper bars. The battery pack also contains many harnesses, which typically pass through the gaps between the cell modules. However, the space required for energy storage battery tanks to house the battery pack is currently compact, and in order to provide the energy storage battery pack with a large current-carrying capacity and high integration, the cells must occupy a large space, resulting in small gaps between the cell modules. This presents significant challenges to the installation space for the copper bars and the current-carrying capacity of the copper bars themselves. Furthermore, the copper bars themselves are at risk of overheating, and since many of the electrical connection components are in direct contact with the surface of the cell modules, an increase in the temperature of the cell modules can affect the electrical connection components and potentially worsen the overall stability. Summary of the Invention [Problem to be solved by the invention]

[0004] The present embodiment provides a cell module and an energy storage battery pack that are advantageous in improving the integration of the connection members, or at least the cell module itself, and in ensuring a high current-carrying capacity of the connection members themselves. [Means for solving the problem]

[0005] According to some embodiments of the present application, in one aspect of the embodiments of the present application, a connection member is provided, the connection member being used to electrically connect output ends between two cell groups, the connection member including a main body portion, a first bent portion, a second bent portion, a first connection portion, and a second connection portion, the main body portion having a first side and a second side oppositely disposed, the main body portion extending from a first end to a second end along a first direction and from a first edge to a second edge along a second direction, the first bent portion and the second bent portion being located at the first end and the second end of the main body portion, respectively, the first bent portion being connected to the first end of the main body portion and being in contact with the first connection portion on the first side. the second bending portion is connected to the second end of the main body portion and is folded back from the second end on the second side toward the second direction; the first connection portion is connected to one end of the first bending portion remote from the main body portion and the first connection portion is folded from the one end of the first bending portion along a third direction, the third direction being the direction from the second side toward the first side; the second connection portion is connected to one end of the second bending portion remote from the main body portion and the second connection portion is folded from the one end of the second bending portion along a fourth direction, the fourth direction being the direction from the first side toward the second side.

[0006] In some embodiments, the angle between the first bent portion and the first side is a first included angle, the angle between the second bent portion and the second side is a second included angle, and at least one of the first included angle and the second included angle is between 0° and 30°.

[0007] In some embodiments, the bending angle of the first bending portion is a first bending angle, the bending angle of the second bending portion is a second bending angle, and at least one of the first bending angle and the second bending angle is greater than 0° and less than 90°.

[0008] In some embodiments, the distance in the third direction between the first bent portion and the first side is a first distance L1, the distance in the third direction between the first bent portion and the second bent portion is a second distance L2, and the ratio of the first distance L1 to the second distance L2 ranges from 1% to 50%.

[0009] In some embodiments, the first distance L1 is in the range of 0 mm to 2.5 mm.

[0010] In some embodiments, the body portion comprises a first cushioning structure located between the first folded portion and the second folded portion.

[0011] In some embodiments, the first direction and the third direction form a reference plane, and the shape of the orthogonal projection pattern of the first buffer structure on the reference plane includes a wave shape or a polygonal line shape.

[0012] In some embodiments, the device further includes a second cushioning structure located on at least one of the first folded portion and the second folded portion.

[0013] In some embodiments, the distance between the first connection portion and the main body portion is a third distance, the distance between the second connection portion and the main body portion is a fourth distance, and at least one of the third distance and the fourth distance is in the range of 2 mm to 100 mm.

[0014] According to some embodiments of the present application, in another aspect of the embodiments of the present application, a cell module is further provided, the cell module including at least two cell groups and a connection member described in any one of the above, wherein the cell groups include output terminals, the output terminals include output connection members, and both ends of the connection member are electrically contacted to the output connection members of the two cell groups, respectively.

[0015] In some embodiments, the cell stack further includes end plates and an output base, wherein the end plates are located at both ends of the cell group, the first connection portion of the connection member is located at the end plates, the output base is located at the end plates, and the top surface of the main body portion of the connection member is not higher than the bottom surface of the output base.

[0016] In some embodiments, the connection structure may further include a connection structure located between the first connection portion of the connection member and the output connection member and between the second connection portion of the connection member and the output connection member.

[0017] In some embodiments, the connection structure surrounds the first connection portion, or the connection structure surrounds the second connection portion.

[0018] In some embodiments, the group of cells includes at least one column of cells arranged along the third direction.

[0019] In some embodiments, the group of cells includes two rows of cells arranged along the third direction.

[0020] According to some embodiments of the present application, in another aspect of the present application, there is further provided an energy storage battery pack including a plurality of cell modules according to any one of the above aspects. [Effects of the Invention]

[0021] The technical solutions provided in the embodiments of the present application have at least the following advantages:

[0022] The connecting member provided in the embodiment of the present application includes a main body portion, a first bent portion, a second bent portion, a first connecting portion, and a second connecting portion, the main body portion extending from a first end to a second end along a first direction and extending from a first edge to a second edge along a second direction, the first bent portion and the second bent portion being located at the first end and the second end of the main body portion, the first bent portion being connected to the first end of the main body portion and extending from the first end to the second direction on the first side. The connecting member is folded back toward the first end of the main body portion, the second bent portion is connected to the second end of the main body portion and is folded back from the second end toward the second direction on the second side, the first connecting portion is folded from one end of the first bent portion away from the main body portion along a third direction, the third direction being the direction from the second side toward the first side, and the second connecting portion is folded from one end of the second bent portion away from the main body portion along a fourth direction, the fourth direction being the direction from the first side toward the second side. This means that the length of the connecting member is not limited to the gap between the cell modules, i.e., the length direction of the connecting member can be converted from the arrangement direction between the two cell modules to the vertical direction and the horizontal direction, and therefore the width direction of the main body portion can also be the vertical direction of the cell modules. In this way, the length of the connecting member can be increased to the length and height of at least one cell module. Compared to conventional technical solutions in which the connecting member electrically connects adjacent cell modules along the horizontal direction, the length of the connecting member can be increased, and the connecting member has sufficient length to ensure the current-carrying capacity between the total output terminals of different cell modules, thereby avoiding problems such as heat problems and current loss caused by excessively large current-carrying capacity of the cell modules.

[0023] Furthermore, the first bent portion is folded back from the first end toward the second direction on the first side, and the second bent portion is folded back from the second end toward the second direction on the second side. Because the gap between the two cell modules does not need to occupy a large space due to issues of the current-carrying capacity of the connecting members and installation issues, the gap between the two cell modules can be shortened. This allows some space in the length direction of the cell modules to be reduced and used for other members, thereby increasing the integration density of the cell modules. The folded surface of the first bent portion and the folded surface of the second bent portion are opposite folded surfaces. In this way, either the first bent portion or the second bent portion can offset fluctuations caused by the other bent portion without significantly affecting the deformation of the first bent portion or the second bent portion itself. [Brief explanation of the drawings]

[0024] One or more embodiments are illustratively described in corresponding figures in the accompanying drawings, and these illustrative descriptions do not limit the embodiments, and unless otherwise specified, the figures in the accompanying drawings do not form proportional limitations. In order to more clearly explain the embodiments of the present disclosure or technical solutions in the prior art, the following will briefly describe the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without paying creative labor. [Figure 1] FIG. 1 is a diagram showing the structure of a connection member provided in one embodiment of the present application. [Figure 2] FIG. 2 is a diagram showing the structure of another connecting member provided in one embodiment of the present application. [Figure 3] FIG. 3 is a top view of a connecting member provided in one embodiment of the present application. [Figure 4] FIG. 4 is a left side view of a connecting member provided in one embodiment of the present application. [Figure 5] FIG. 5 is a left side view of another connecting member provided in one embodiment of the present application. [Figure 6]FIG. 6 is a local cross-sectional view of another connecting member provided in one embodiment of the present application. [Figure 7] FIG. 7 is a diagram showing the local structure of a cell module provided in one embodiment of the present application. [Figure 8] FIG. 8 is a diagram showing the local structure of another cell module provided in one embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0025] As can be seen from the background art, the integration density of conventional cell modules is limited, and the current-carrying capacity of the connecting members themselves is poor.

[0026] In an embodiment of the present application, there is provided a connecting member including a main body portion, a first folded portion, a second folded portion, a first connecting portion, and a second connecting portion, wherein the main body portion extends from a first end to a second end along a first direction and from a first edge to a second edge along a second direction, the first folded portion and the second folded portion are located at the first end and the second end of the main body portion, and the first folded portion is connected to the first end of the main body portion and extends from the first end to the second end on a first side. The connecting member is folded in two directions, the second folding portion is connected to the second end of the main body portion and is folded back on the second side from the second end toward the second direction, the first connecting portion is folded from one end of the first folding portion away from the main body portion along a third direction, the third direction being the direction from the second side toward the first side, and the second connecting portion is folded from one end of the second folding portion away from the main body portion along a fourth direction, the fourth direction being the direction from the first side toward the second side. This means that the length of the connecting member is not limited to the gap between the cell modules, i.e., the length direction of the connecting member can be converted from the arrangement direction between the two cell modules to the vertical direction and the horizontal direction, and therefore the width direction of the main body portion can also be the vertical direction of the cell modules. In this way, the length of the connecting member can be increased to the length and height of at least one cell module. Compared to conventional technical solutions in which the connecting member electrically connects adjacent cell modules along the horizontal direction, the length of the connecting member can be increased, and the connecting member has sufficient length to ensure the current-carrying capacity between the total output terminals of different cell modules, thereby avoiding problems such as heat problems and current loss caused by excessively large current-carrying capacity of the cell modules.

[0027] Furthermore, the first bent portion is folded back from the first end toward the second direction on the first side, and the second bent portion is folded back from the second end toward the second direction on the second side. Because the gap between the two cell modules does not need to occupy a large space due to issues of the current-carrying capacity of the connecting members and installation issues, the gap between the two cell modules can be shortened. This allows some space in the length direction of the cell modules to be reduced and used for other members, thereby increasing the integration density of the cell modules. The folded surface of the first bent portion and the folded surface of the second bent portion are opposite folded surfaces. In this way, either the first bent portion or the second bent portion can offset fluctuations caused by the other bent portion without significantly affecting the deformation of the first bent portion or the second bent portion itself.

[0028] Hereinafter, each embodiment of the present application will be described in detail in conjunction with the drawings. However, as will be understood by those skilled in the art, although many technical details are proposed in the embodiments of the present application to help readers better understand the present application, the technical solutions claimed for protection in the embodiments of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.

[0029] In the description of the embodiments of the present application, technical terms such as "first," "second," etc. are used only to distinguish between different objects, and should not be understood as expressing or implying relative importance, or implicitly indicating the number, specific order, or primary relationship of the technical features shown. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise specified.

[0030] The term "embodiment" as used in the specification means that a particular feature, structure, or characteristic described in combination with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to all the same embodiment, nor does it mean that the embodiment is independent of or interchangeable with other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiment described herein can be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is merely a relational relationship that describes related objects, and means that three relationships can exist. For example, A and / or B can mean that there are three situations: A exists, A and B exist simultaneously, and B exists. In addition, the symbol " / " in this specification generally indicates that the related objects before and after it are in an "OR" relationship.

[0032] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "multiple sets" refers to two or more sets (including two sets); and "plurality" refers to two or more (including two).

[0033] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of the embodiments of the present application. They do not indicate or imply that a specified device or part must be configured or operated in a specific orientation, and should not be understood as limiting the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "attached," "connected," "coupled," and "fixed" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integrated structure. They may also refer to a mechanical connection or an electrical connection. They may also refer to a direct connection, an indirect connection via an intermediate medium, internal communication between two components, or an interactive relationship between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to the specific circumstances.

[0035] In the drawings corresponding to the embodiments of the present invention, the thickness and area of ​​layers are exaggerated for better understanding and ease of explanation. When describing one component (e.g., a layer, film, region, or substrate) as being on or on the surface of another component, this component may be disposed "directly" on the surface of the other component, or a third component may exist between the two components. Conversely, when describing one component as being on the surface of another component, or having another component formed or attached to the surface of one component, it indicates that there is no third component between the two components. Also, when describing one component as being "substantially" formed on another component, it means that this component is not formed on the entire surface (or front surface) of the other component, but rather on a partial edge of the entire surface.

[0036] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise specified, other components are not excluded and may further include other components. Furthermore, when a component such as a layer, film, region, or plate is said to be "located / positioned" on another component, it may be "directly located" on the other component (i.e., there are no other components between it and the surface of the other component), or there may be other components between them. Furthermore, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it means that there are no other components interposed between them.

[0037] In this specification, the terms used in the various embodiments described above are used only to describe particular embodiments and are not intended to be limiting. As used in the description of the various embodiments described and in the appended claims, "the member" is also intended to include plural forms unless the context clearly dictates otherwise. Here, a member includes a component such as a layer, film, region, or plate.

[0038] FIG. 1 is a diagram showing the structure of a connection member provided in one embodiment of the present application, and FIG. 2 is a diagram showing the structure of another connection member provided in one embodiment of the present application.

[0039] As shown in FIG. 1 , some embodiments of the present application provide a connection member for electrically connecting output ends between two cell groups, and the connection member includes a main body 100 (see FIG. 3 ), a first bent portion 101 and a second bent portion 102, a first connection portion 111, and a second connection portion 112, wherein the main body 100 has a first side 11 and a second side 12 arranged opposite to each other, the main body 100 extends from a first end to a second end along a first direction, and extends from a first edge to a second edge along a second direction, the first bent portion 101 and the second bent portion 102 are located at the first end and the second end of the main body 100, the first bent portion 101 is connected to the first end of the main body, and the first side 11 is connected to the second end of the main body. the first connecting portion 111 is connected to one end of the first bending portion 101 remote from the main body portion 100, and the first connecting portion 111 is folded from the one end of the first bending portion 101 remote from the main body portion 100 along a third direction, the third direction being a direction from the second side 12 to the first side 11; the second connecting portion 112 is connected to one end of the second bending portion 102 remote from the main body portion 100, and the second connecting portion 112 is folded from the one end of the second bending portion 102 remote from the main body portion 100 along a fourth direction, the fourth direction being a direction from the first side 11 to the second side 12.

[0040] In some embodiments, the connecting member is generally used to electrically connect the aggregate output terminal between two cell modules, and the connecting member is used to connect two adjacent cell modules in series or in parallel.

[0041] In some embodiments, one end of the connection member is electrically connected to the overall output terminal of one cell module, and the other end of the connection member is electrically connected to an external connection device, which may include a shunt, a control terminal, or an overall output terminal of the energy storage battery pack.

[0042] In some embodiments, the connecting member may be a copper bar, which has the properties of metallic copper. First, copper has low electrical resistance and small losses during current transport. Second, copper is inexpensive, which reduces the manufacturing cost of the entire battery pack. Third, it has a large current-carrying capacity, which ensures that the current of a single cell module is transported through the copper bar without posing a significant safety risk. Finally, the copper bar itself has good heat dissipation and heat conduction capabilities, which can avoid thermal issues in the connecting member itself and improve the stability and safety of the cell module including the connecting member.

[0043] In some embodiments, the total output terminal is electrically connected to another cell module or device to realize power output or input. The total output terminal includes a total positive output terminal or a total negative output terminal. The connection member can be electrically connected to the total positive output terminal or the total negative output terminal.

[0044] In some embodiments, the connecting member has a first bent portion 101, a second bent portion 102, and a combination of the first bent portion 101 and the second bent portion 102, so that the length of the connecting member is not limited to the gap between the cell modules. That is, the length of the connecting member can be converted from the arrangement direction between the two cell modules to the vertical direction or the horizontal direction, and thus the width direction of the body portion may be the vertical direction of the cell modules. In this way, the length of the connecting member can be increased to the length of at least one cell module and the height of the cell module. Compared to conventional technical solutions in which the connecting member electrically connects adjacent cell modules along the horizontal direction, the increased length of the connecting member allows the connecting member to have a sufficient length to ensure the current-carrying capacity between the total output terminals, thereby avoiding problems such as heat and current loss caused by an excessive current-carrying capacity of the cell modules.

[0045] In addition, by changing the structure of the connecting member and the special bending direction, the gap between the two cell modules no longer needs to occupy a large space due to issues with the current-carrying capacity and installation of the connecting member, so the gap between the two cell modules can be shortened, and some space in the length direction of the cell modules can be reduced and given to other components, thereby increasing the integration degree of the cell modules.

[0046] In some embodiments, since the length direction of the connecting member is converted from the arrangement direction between the two cell modules to the vertical and horizontal directions, the area of ​​the first side 11 and the second side 12 also does not need to be reduced to avoid interference between the low-voltage connector and the connecting member and the low-voltage connector, so the cross-section of the first side 11 and the second side 12 or the main body portion 100 can extend along the height direction of the cell, thereby increasing the cross-sectional area of ​​the connecting member and reducing the electrical resistance of the connecting member.

[0047] In some embodiments, the first bent portion 101 is folded back from the first side 11 along the third direction toward the second direction (i.e., the first bent portion 101 is folded back from the first end on the first side 11 toward the second direction), and the second bent portion 102 is folded back from the second side 12 along the fourth direction toward the second direction (i.e., the second bent portion 102 is folded back from the second end on the second side 12 toward the second direction). The folded surfaces of the first bent portion 101 and the second bent portion 102 are opposite folded surfaces because the fourth direction and the third direction are opposite directions. This allows either the first bent portion 101 or the second bent portion 102 to cancel out the deformation of the other without significantly affecting the deformation of the first bent portion 101 or the second bent portion 102 itself.

[0048] Furthermore, the design of the first bending portion 101 and the second bending portion 102 prevents direct contact between the main body 100 and the cell module, and provides a gap the thickness of at least one connecting member between the two, thereby reducing the contact area between the main body 100 and the cell module and the contact area between the connecting member and the cell module, helping to avoid interference and heat problems between the connecting member and each component of the cell module. The bending design of the first bending portion 101 and the second bending portion 102 leaves a certain gap between the main body 100 and the cell module. This gap contributes to heat dissipation from the connecting member itself, prevents cell module jitter caused by jitter in the connecting member, and improves the stability of the cell module.

[0049] In some embodiments, the first connecting portion 111 is bent from one end of the first bent portion 101 away from the main body portion along a third direction, where the third direction is the direction from the second side 12 to the first side 11, and the second connecting portion 112 is bent from one end of the second bent portion 102 away from the main body portion along a fourth direction, where the fourth direction is the direction from the first side 11 to the second side 12. From this, it can be seen that the first connecting portion 111 and the second connecting portion 112 are bent in opposite directions. As a result, the directions of application of force and deformation of both are opposite, which can increase the structural strength of the connecting member, and since deformation of the connecting member occurs in two different directions, interference between the first connecting portion 111 and the second connecting portion 112 can be avoided.

[0050] FIG. 3 is a top view of a connecting member provided in one embodiment of the present application, FIG. 4 is a left side view of a connecting member provided in one embodiment of the present application, FIG. 5 is a left side view of another connecting member provided in one embodiment of the present application, and FIG. 6 is a local cross-sectional view of another connecting member provided in one embodiment of the present application.

[0051] In some embodiments, as shown in FIG. 3, the included angle between the first bent portion 101 and the first side 11 is a first included angle α1, and the included angle between the second bent portion 102 and the second side 12 is a second included angle α2, and at least one of the first included angle and the second included angle is between 0° and 30°, for example, 0°, 8°, 13°, 16°, 22°, 26°, 30°, etc. When either the first included angle or the second included angle is within the above range, the degree of deformation of the first bent portion 101 can satisfy and offset the installation tolerance between the two cell modules, and the deformation of the first bent portion 101 does not exceed the degree of deformation of the connecting member itself, allowing the connecting member itself to have high strength and structural integrity. At the same time, the degree of deformation of the first bent portion 101 must also ensure that there are no interference problems between the edges of the first bent portion 101 and the second bent portion 102 and the cell modules. Similarly, the degree of deformation of the second bent portion 102 achieves the same technical effect as the first bent portion 101, and therefore will not be described again here.

[0052] In some embodiments, as shown in FIG. 4 or 5 , the bending angle of the first bending portion 101 is a first bending angle β1, and the bending angle of the second bending portion 102 is a second bending angle β2. At least one of the first bending angle β1 and the second bending angle β2 is between 0° and 90°, such as 0°, 20°, 30°, 45°, 53°, 66°, or 90°. When either the first bending angle β1 or the second bending angle β2 is within the above range, the length of the first bending portion 101 itself in the first direction is not long, allowing the main body 100 to have a large space and the length of the connecting member to be increased. Similarly, the degree of deformation of the second bending portion 102 achieves the same technical effect as the first bending portion 101, and therefore will not be described again here.

[0053] In some embodiments, the direction of extension of the length of the body portion 100 does not have to be perpendicular to the second direction, i.e., the first direction may intersect with the second direction, and the angle of intersection is between 0° and 90°. When the direction of extension of the length of the body portion 100 and the second direction are perpendicular, the combination of the first bent portion 101 and the second bent portion 102 allows the connecting member to have a long length for transporting current.

[0054] In some embodiments, the width of the main body portion 100 may be the same as the width of the first folded portion 101 and the second folded portion 102, or the width of the main body portion 100 may be greater than the width of the first folded portion 101 and the second folded portion 102. In the embodiments of the present application, the size of the width between the main body portion 100 and the first folded portion 101 and the second folded portion 102 is not limited.

[0055] Similarly, the thickness of the main body 100, the thickness of the first bent portion 101, the thickness of the second bent portion 102, the thickness of the first connecting portion 111, and the thickness of the second bent portion 102 can be set by a person skilled in the art according to actual needs, and the present application does not specifically limit this.

[0056] 1 , the distance in the third direction between the first bent portion 101 and the first side 11 is a first distance L1, the distance in the third direction between the first bent portion 101 and the second bent portion 102 is a second distance L2, and the ratio of the first distance L1 to the second distance L2 ranges from 1% to 50%. The ratio of the first distance L1 to the second distance L2 may range from 1%, 10%, 23%, 38%, 43%, 50%, etc. If the ratio of the first distance L1 to the second distance L2 is within any of the above ranges, the first bent portion 101 has a large space for deformation, which reduces the mounting tolerance between the two cell modules and increases the yield of the cell modules. At the same time, the distance between the first bent portion 101 and the main body portion allows a gap to be provided between the main body portion and the cell modules, which improves heat dissipation of the connecting member.

[0057] 1 or 6, the distance between the second bent portion 102 and the second side 12 is a fifth distance L5, and the ratio of the fifth distance L5 to the second distance L2 is in the range of 1% to 50%, such as 1%, 10%, 23%, 38%, 43%, 50%, etc. When the ratio of the fifth distance L5 to the second distance L2 is within any of the above ranges, the second bent portion 102 provides a large space for deformation, reducing the mounting tolerance between the two cell modules and increasing the yield of the cell modules. At the same time, the distance between the second bent portion 102 and the main body portion 100 can provide a gap between the main body portion 100 and the cell modules, improving heat dissipation of the connection members.

[0058] In some embodiments, the first distance L1 is in the range of 0 mm to 2.5 mm, and may be, for example, 0 mm, 0.8 mm, 1.3 mm, 1.6 mm, 2.0 mm, or 2.5 mm. When the first distance L1 is within the above range, a gap is provided between the first bent portion 101 and the main body 100, which can prevent interference and improve the heat dissipation function of the connecting member. When the first distance L1 is within the above range, the distance between the two cell groups can be further reduced, allowing more cells to be integrated in a limited space, resulting in a larger battery capacity for the energy storage battery pack.

[0059] In some embodiments, as shown in FIG. 4, the distance between the first connecting portion 111 (see FIG. 1) and the main body 100 is a third distance L3, and the distance between the second connecting portion 112 (see FIG. 1) and the main body 100 is a fourth distance L4, with at least one of the third distance L3 and the fourth distance L4 ranging from 2 mm to 100 mm. The lengths of the third distance L3 and the fourth distance L4 are used to ensure that there are no interference issues between the main body 100 and the low-voltage connector on the end plate and to appropriately lengthen the connecting member itself. The appropriate length means that the length of the connecting member can meet the current-carrying needs of the connecting member and prevent material waste due to excessive length of the connecting member.

[0060] 2 or 5, the main body 100 includes a first buffer structure 103 located between the first bent portion 101 and the second bent portion 102. The first buffer structure 103 is used to reduce the effect of jitter between two adjacent cell modules, and the first buffer structure 103 can avoid the problem of the weld between the connecting member and the cell module being cut.

[0061] In some embodiments, the first direction and the third direction form a reference plane, and the shape of the orthogonal projection pattern of the first buffer structure 103 on the reference plane includes a wave shape or a broken line shape. The first buffer structure 103 can be designed to efficiently utilize the material area, and the first buffer structure 103 does not involve cutting the main body 100. The first buffer structure 103 is a bending design and deformation treatment on the main body 100, and the connecting member remains a one-piece molded structure without cracks, so the current-carrying capacity of the connecting member itself remains unchanged, the internal resistance of the connecting member is small, and the strength of the connecting member itself is increased, thereby improving the stability and reliability of the cell module.

[0062] In some embodiments, the connecting member further includes a second buffer structure located at at least one of the first bent portion 101 and the second bent portion 102. The provision of the second buffer structure can further enhance the stability and reliability of the connecting member.

[0063] In some embodiments, the shape of the orthogonal projection pattern on the reference surface of the second buffer structure comprises a wave shape or a polygonal line shape.

[0064] In some embodiments, the maximum length of the first buffer structure 103 in the third direction is less than 2 mm, which can avoid interference between the first buffer structure 103 and other components.

[0065] As shown in FIG. 1 , the first connecting portion 111 and the second connecting portion 112 have mounting holes for riveting to the output connecting member. Taking the mounting hole of the first connecting portion 111 as an example, the distance in the first direction between the edge of the mounting hole and the edge of the first connecting portion 111 is a first edge distance S1, where the first edge distance S1 is equal to or greater than 20 mm. The distance in the third direction between the edge of the mounting hole and the edge of the first connecting portion 111 is a second edge distance S2, where the second edge distance S2 is equal to or greater than 20 mm. If the first edge distance S1 and the second edge distance S2 are within the above ranges, the probability of the edges being damaged when screws are subsequently attached can be reduced.

[0066] In some embodiments, the width and thickness of the connecting member (cross-sectional area of ​​the connecting member) can be set according to the current demand of the entire cell module, although the present application does not limit this.

[0067] In the connection member provided in the embodiment of the present application, the connection member includes a main body portion 100, a first bent portion 101, a second bent portion 102, a first connecting portion 111, and a second connecting portion 112, wherein the main body portion 100 extends from a first end to a second end along a first direction and extends from a first edge to a second edge along the second direction, the first bent portion 101 and the second bent portion 102 are located at the first end and the second end of the main body portion 100, and the first bent portion 101 is connected to the first end of the main body portion and extends from the first end to the second end along a first side 111. The connecting member is folded in two directions, the second bent portion 102 is connected to the second end of the main body portion and is folded back from the second end at the second side 12 in the second direction, the first connecting portion 111 is folded from one end of the first bent portion 101 away from the main body portion 100 along a third direction, the third direction being the direction from the second side 12 to the first side 11, and the second connecting portion 112 is folded from one end of the second bent portion 102 away from the main body portion 100 along a fourth direction, the fourth direction being the direction from the first side 11 to the second side 12. As a result, the length of the connecting member is not limited to the gap between the cell modules; that is, the length direction of the connecting member can be converted from the arrangement direction between the two cell modules to the vertical direction and the horizontal direction. Therefore, the width direction of the main body portion may also be the vertical direction of the cell modules. In this way, the length of the connecting member can be increased to the length and height of at least one cell module. Compared to conventional technical solutions in which the connecting member electrically connects adjacent cell modules along the horizontal direction, the length of the connecting member can be increased, and the connecting member has sufficient length to ensure the current-carrying capacity between the total output terminals, thereby avoiding problems such as heat problems and current loss caused by the cell module's excessively large current-carrying capacity.

[0068] Furthermore, the first bent portion 101 is bent back from the first end toward the second direction on the first side 11, and the second bent portion 102 is bent back from the second end toward the second direction on the second side 12. Because the gap between the two cell modules does not need to occupy a large space due to issues of the current-carrying capacity of the connecting members and installation issues, the gap between the two cell modules can be shortened. This allows some space in the length direction of the cell modules to be reduced and used for other members, thereby increasing the integration density of the cell modules. The folded surface of the first bent portion 101 and the folded surface of the second bent portion 102 are opposite folded surfaces. In this way, either the first bent portion 101 or the second bent portion 102 can offset the deformation of the other without significantly affecting the deformation of the first bent portion 101 or the second bent portion 102 itself.

[0069] In response to the above, some embodiments of the present application further provide a cell module including the connection member provided in the above embodiments in another aspect of the embodiments of the present application. The same or corresponding technical features as those in the above embodiments will not be described again here.

[0070] FIG. 7 is a diagram showing a local structure of a cell module provided in one embodiment of the present application, and FIG. 8 is a diagram showing a local structure of another cell module provided in one embodiment of the present application.

[0071] As shown in Figure 7, the cell module includes at least two cell groups and a connection member according to any one of the above embodiments, where the cell groups include output ends, the output ends include output connection members 23, and both ends of the connection member 10 are electrically connected to the output connection members 23 of the two cell groups, respectively.

[0072] In some embodiments, a cell group refers to a group of cells arranged in sequence along a fifth direction. The cells are connected in series via a busbar connecting member. Each cell includes a positive electrode, a negative electrode, and an explosion-proof opening. Each end of the busbar connecting member is electrically connected to the electrodes of two cells. For example, the busbar connecting member is electrically connected to the positive electrode of one cell and the negative electrode of the other cell. The fifth direction may be the third direction in the above embodiments.

[0073] In some embodiments, the bus bar connection members may be aluminum bars, which have low electrical resistance, low cost, and high weldability between the aluminum bars and the materials between the positive and negative electrodes, and can reduce contact resistance between the bus bar connection members and the cells.

[0074] In some embodiments, both ends of the cell group have a common output terminal, the common output terminal being one electrode of the outermost cell, and an output connection member being connected to the common output terminal, which may be an aluminum bar.

[0075] In some embodiments, the connection between the output connection member and the connection member is made by a stud bolt, ultrasonic welding, or thermocompression. As shown in Figure 7, this application will be described taking as an example that the connection between the output connection member 23 and the connection member 10 is made by a stud bolt 24.

[0076] In some embodiments, the output connection member 23 and the connection member 10 are integrally molded and installed, eliminating the need to assemble the connection member to the output connection member separately during the cell module assembly process, thereby saving cell module assembly time and improving assembly efficiency. At the same time, the need to install studs on the output connection member is eliminated, allowing the height of the cell module to be reduced, i.e., occupying less space. The need to use tools to install studs during cell module assembly further reduces assembly space, meets the space limitations when assembling cell modules vertically, and reduces installation costs. When assembling cell modules vertically in a battery pack case, the reserved space between two opposing cell modules is reduced, allowing the two cell modules to be assembled more compactly, thereby reducing the volume of the battery pack.

[0077] Furthermore, the output connection member and the connection member are integrally molded and installed, so that the surfaces of the connection member and the output connection member at the connection point are in close contact with each other, and the molecules of the output connection member and the connection member at the connection point are also in close contact with each other, effectively preventing the progression of oxidation-reduction reactions and thus corrosion at the connection point, thereby effectively protecting the connection point between the output connection member and the connection member and extending the life of the cell module.

[0078] In some embodiments, the cell module further includes end plates 22 and an output base 21, the end plates 22 being located at both ends of the cell group, the first connection portion 111 (see FIG. 1) of the connection member 10 being located on the end plates 22, and the output base 21 being located on the end plates 22. Since the top surface of the main body portion 100 (see FIG. 1) of the connection member 10 is not higher than the bottom surface of the output base 21, interference between the connection member 10 and the output base 21 can be avoided.

[0079] In some embodiments, the cell module further includes a connection structure, the connection structure being located between the first connection portion of the connection member and the output connection member and between the second connection portion of the connection member and the output connection member. The connection structure has two surfaces, an upper surface and a lower surface, and the upper surface of the connection structure is welded to the connection member, and the lower surface of the connection structure is welded to the output connection member. Although aluminum and copper have general welding performance, the welding performance between the material of the connection member and the material of the first connection portion or the second connection portion is good. Therefore, by installing an additional connection member as a welding spacer between the output connection member and the connection member, the welding performance between the connection member and the output connection member and further the contact performance between the output connection member and the connection member can be improved.

[0080] In some embodiments, the connection structure surrounds the first connection portion, or the connection structure surrounds the second connection portion.

[0081] In some embodiments, the cell group includes at least one row of cells arranged along the third direction. In some embodiments, referring to Figure 8, the cell group includes two rows of cells arranged along the third direction. In this way, the connection members can be installed based on different cells, making the present invention highly practical.

[0082] In response to the above, some embodiments of the present application further provide an energy storage battery pack including the cell module provided in the above embodiments. The same or corresponding technical features as those in the above embodiments will not be described again here.

[0083] In some embodiments, an energy storage battery pack includes a plurality of cell modules of any of the above embodiments.

[0084] In some embodiments, the energy storage battery pack may be a pack in an energy storage tank, and a plurality of cell modules may be regularly arranged to form the energy storage battery pack. The specific number of cell modules may be set as needed and is not particularly limited herein. For example, the number of cell modules may be set to one, two, four, five, six, etc.

[0085] The energy storage battery pack further includes a BMS system, which can be used to control and detect the operation of each cell module.

[0086] Although the present application has been disclosed as above in preferred embodiments, they are not used to limit the scope of the claims, and any person skilled in the art can make some possible changes and modifications without departing from the concept of the present application, so the scope of protection of the present application should be based on the scope defined in the claims of the present application.

[0087] Those skilled in the art will understand that the above embodiments are specific examples for realizing the present application, but that various changes in form and details are possible in practice without departing from the scope of the present application. Since anyone skilled in the art can make changes and modifications without departing from the scope of the present application, the scope of protection of the present application should be based on the scope limited by the claims.

Claims

1. A connecting member for electrically connecting output ends between two cell groups, a main body portion, a first bent portion, a second bent portion, a first connecting portion, and a second connecting portion; the body portion has oppositely disposed first and second sides, the body portion extending from a first end to a second end along a first direction and from a first edge to a second edge along a second direction; the first bent portion and the second bent portion are located at the first end and the second end of the main body portion, respectively, the first bent portion is connected to the first end of the main body portion and is folded back from the first end on the first side toward the second direction, and the second bent portion is connected to the second end of the main body portion and is folded back from the second end on the second side toward the second direction, the first connection portion is connected to one end of the first bent portion that is distant from the main body portion, the first connection portion is bent from the one end of the first bent portion along a third direction, the third direction being a direction from the second side toward the first side, the second connection portion is connected to one end of the second bent portion that is remote from the main body portion, and the second connection portion is bent from the one end of the second bent portion along a fourth direction, and the fourth direction is a direction from the first side toward the second side. A connecting member characterized by:

2. The angle between the first bent portion and the first side is a first included angle, the angle between the second bent portion and the second side is a second included angle, and at least one of the first included angle and the second included angle is between 0° and 30°. The connecting member according to claim 1 .

3. a bending angle of the first bending portion is a first bending angle, a bending angle of the second bending portion is a second bending angle, and at least one of the first bending angle and the second bending angle is greater than 0° and less than 90°; The connecting member according to claim 1 .

4. a distance in the third direction between the first bent portion and the first side is a first distance, a distance in the third direction between the first bent portion and the second bent portion is a second distance, and a ratio of the first distance to the second distance is in a range of 1% to 50%; The connecting member according to claim 1 .

5. The first distance ranges from 0 mm to 2.5 mm. The connecting member according to claim 4 .

6. The main body portion includes a first buffer structure located between the first bent portion and the second bent portion. The connecting member according to claim 1 .

7. the first direction and the third direction form a reference plane, and the shape of the orthogonal projection pattern of the first buffer structure on the reference plane includes a wave shape or a polygonal line shape; The connecting member according to claim 6 .

8. further comprising a second buffer structure located at least one of the first bent portion and the second bent portion; The connecting member according to claim 1 .

9. a distance between the first connection portion and the main body portion is a third distance, a distance between the second connection portion and the main body portion is a fourth distance, and at least one of the third distance and the fourth distance is in a range of 2 mm to 100 mm; The connecting member according to claim 1 .

10. At least two cell groups and the connection member according to any one of claims 1 to 9, The cell group includes an output terminal, the output terminal includes an output connection member, and both ends of the connection member are in electrical contact with the output connection members of two of the cell groups, respectively. A cell module characterized by:

11. The solar cell further includes end plates and an output base, the end plates being located at both ends of the cell group, the first connection portion of the connection member being located at the end plates, the output base being located at the end plates, and the top surface of the main body portion of the connection member being not higher than the bottom surface of the output base. The cell module according to claim 10 .

12. further including a connection structure, the connection structure being located between the first connection portion of the connection member and the output connection member and between the second connection portion of the connection member and the output connection member; The cell module according to claim 10 .

13. The connection structure surrounds the first connection portion, or the connection structure surrounds the second connection portion. The cell module according to claim 12 .

14. the cell group includes at least one column of cells arranged along the third direction; The cell module according to claim 10 .

15. the cell group includes two rows of cells arranged along the third direction; The cell module according to claim 14 .

16. A cell module according to any one of claims 10 to 15, 1. An energy storage battery pack comprising:

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