Connecting member, cell module, and energy storage battery pack

Abstract

Embodiments of the present application relate to the field of energy storage, and provide a connection member, a cell module, and an energy storage battery pack. 【Solution means】 The connection member is used to electrically connect the output ends of two cell groups, and includes a main body portion having a first side and a second side arranged opposite to each other, a first bending portion and a second bending portion, a first connection portion, and a second connection portion. The first bending portion is folded back in the second direction on the first side, the second bending portion is folded back in the second direction on the second side, the first connection portion is located at one end of the first bending portion away from the main body portion, the first connection portion is bent along the third direction from the first bending portion, the third direction is the direction from the second side to the first side, the second connection portion is located at one end of the second bending portion away from the main body portion, and the second connection portion is bent along the fourth direction from the second bending portion, the fourth direction is the direction from the first side to the second side. The connection member according to the embodiments of the present application can at least improve the integration degree of the cell module itself.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage, and particularly to connection members, cell modules, and energy storage battery packs.

Background Art

[0002] In the prior art, generally, first, a plurality of cell groups are combined to form one cell module, then a plurality of cell modules are installed inside a battery pack in series and parallel forms, and electrical members and structural fixing members are installed. Finally, the battery pack is installed in a battery holder to form a battery cluster, and thus an energy storage system is configured.

[0003] Normally, cell modules are assembled in a battery pack. The cell modules achieve electrical connection with each other through copper bars. Also, there are many harnesses in the battery pack, and the harnesses usually pass through the gaps between the cell modules. However, currently, the space of the energy storage battery tank for housing the battery pack is compact, and in order to make the cells occupy a large space so that the energy storage battery pack has a large current-carrying capacity and a large integration degree, the gap between the cell modules becomes small. As a result, there is a risk that the installation space of the copper bars and the current-carrying capacity of the copper bars themselves will face great challenges. In addition, there is a risk of temperature rise in the copper bars themselves, and since many of the electrical connection members are in direct contact with the surface of the cell modules, when the temperature of the cell modules rises, it will affect the electrical connection members, and there is a risk that the overall stability will deteriorate.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the embodiments of the present application, there are provided connection members, cell modules, and energy storage battery packs that are advantageous for improving the integration degree of at least the cell modules themselves and ensuring a high current-carrying capacity of the connection members themselves.

Means for Solving the Problems

[0005] According to some embodiments of the present application, in one aspect of the embodiments of the present application, a connection member is provided, which is used to electrically connect the output ends between two cell groups, and includes a main body portion, a first bending portion and a second bending portion, a first connection portion, and a second connection portion. The main body portion includes a first side and a second side that are oppositely arranged. The main body portion 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 bending portion and the second bending portion are respectively located at the first end and the second end of the main body portion. The first bending portion is connected to the first end of the main body portion and is folded back from the first end toward the second direction 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 toward the second direction on the second side. The first connection portion is connected to one end of the first bending portion away from the main body portion, and the first connection portion is bent along a third direction from the one end of the first bending portion. The third direction is a direction from the second side toward the first side. The second connection portion is connected to one end of the second bending portion away from the main body portion, and the second connection portion is bent along a fourth direction from the one end of the second bending portion. The fourth direction is a direction from the first side toward the second side.

[0006] In some embodiments, the included angle between the first bending portion and the first side is a first included angle, and the included angle between the second bending portion and the second side is a second included angle. 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, and the bending angle of the second bending portion is a second bending angle. 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 bending portion and the first side is the first distance L1, the distance in the third direction between the first bending portion and the second bending portion is the second distance L2, and the range of the ratio of the first distance L1 to the second distance L2 is 1% to 50%.

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

[0010] In some embodiments, the main body portion includes a first buffer structure located between the first bending portion and the second bending portion.

[0011] In some embodiments, the first direction and the third direction constitute a reference plane, and the shape of the orthographic projection pattern of the first buffer structure on the reference plane includes a waveform or a polyline shape.

[0012] In some embodiments, it further includes a second buffer structure located at least on one of the first bending portion and the second bending portion.

[0013] In some embodiments, the distance between the first connecting portion and the main body portion is the third distance, the distance between the second connecting portion and the main body portion is the fourth distance, and the range of at least one of the third distance and the fourth distance is 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, and this cell module includes at least two cell groups and the connecting member described in any one of the above items. The cell group includes an output end, the output end includes an output connecting member, and both ends of the connecting member are electrically in contact with the output connecting members of the two cell groups respectively.

[0015] In some embodiments, it further includes an end plate and an output base, the end plate is located at both ends of the cell group, the first connection part of the connection member is located on the end plate, the output base is located on the end plate, and the upper surface of the main body part of the connection member is not higher than the bottom surface of the output base.

[0016] In some embodiments, it further includes a connection structure, and the connection structure is located between the first connection part of the connection member and the output connection member and between the second connection part of the connection member and the output connection member.

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

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

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

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

Advantages of the Invention

[0021] The technical solution provided by the embodiments of the present application has at least the following advantages.

[0022] The connecting member provided in the embodiment of the present application includes a main body portion, a first bending portion, a second bending portion, a first connecting portion, and a second connecting portion. The main body portion 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 bending portion and the second bending portion are located at the first end and the second end of the main body portion. The first bending portion is connected to the first end of the main body portion and is folded back from the first end toward the second direction 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 toward the second direction on the second side. The first connecting portion is bent along a third direction from one end of the first bending portion away from the main body portion. The third direction is a direction from the second side toward the first side. The second connecting portion is bent along a fourth direction from one end of the second bending portion away from the main body portion. The fourth direction is a direction from the first side toward the second side. Thereby, 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 is 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 module. In this way, the length in the length direction of the connecting member can be increased to at least the length of one cell module and the height of the cell module. Compared with the conventional technical solution 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 a sufficient length to ensure the capacitance between the total output ends between different cell modules, and problems such as heat problems and conduction losses caused by too large capacitance of the cell module can be avoided.

[0023] Further, the first bending portion is folded back from the first end toward the second direction on the first side, and the second bending portion is folded back from the second end toward the second direction on the second side. Since the gap between the two cell modules does not need to occupy a large space due to the problem of the capacitance of the connection member and the problem of attachment, the gap between the two cell modules can be shortened. Thereby, a part of the space in the length direction of the cell module can be reduced and given to other members, increasing the integration degree of the cell module. The folding surfaces of the first bending portion and the second bending portion are opposite folding surfaces. In this way, either one of the first bending portion and the second bending portion can cancel out the fluctuations caused by the other without significantly affecting the deformation of the first bending portion or the second bending portion itself.

Brief Description of the Drawings

[0024] One or more embodiments are exemplarily illustrated in the figures in the corresponding attached drawings. These exemplary descriptions do not limit the embodiments. Unless otherwise specified, the figures in the attached drawings do not form a proportional limitation. To more clearly explain the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

Figure 1

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Figure 8

MODE FOR CARRYING OUT THE INVENTION

[0025] As can be seen from the background art, the integration degree of the conventional cell module itself is limited, and the current-carrying capacity of the connection member itself is poor.

[0026] In an embodiment of the present application, a connection member including a main body portion, a first bending portion, a second bending portion, a first connection portion, and a second connection portion is provided. Here, the main body portion 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 bending portion and the second bending portion are located at the first end and the second end of the main body portion. The first bending portion is connected to the first end of the main body portion and is folded back from the first end toward the second direction 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 toward the second direction on the second side. The first connection portion is bent along a third direction from one end away from the main body portion of the first bending portion, and the third direction is a direction from the second side toward the first side. The second connection portion is bent along a fourth direction from one end away from the main body portion of the second bending portion, and the fourth direction is a direction from the first side toward the second side. Thereby, the length of the connection member is not limited to the gap between the cell modules, that is, the length direction of the connection member is converted from the arrangement direction between the two cell modules to the vertical direction and the horizontal direction. For this reason, the width direction of the main body portion may also be the vertical direction of the cell module. In this way, the length in the length direction of the connection member can be increased to at least the length of one cell module and the height of the cell module. Compared with the conventional technical solution in which the connection member electrically connects adjacent cell modules along the horizontal direction, the length of the connection member can be increased, and the connection member has a sufficient length to ensure the capacitance between the total output ends between different cell modules, and problems such as heat problems and conduction losses caused by an overly large conduction capacitance of the cell module can be avoided.

[0027] Moreover, the first folding portion is folded back from the first end in the second direction on the first side, and the second folding portion is folded back from the second end in the second direction on the second side. Since the gap between the two cell modules does not need to occupy a large space due to the problem of the capacitance of the connecting member and the problem of installation, the gap between the two cell modules can be shortened. Thereby, a part of the space in the length direction of the cell module can be reduced and given to other members, increasing the integration degree of the cell module. The folding surfaces of the first folding portion and the second folding portion are opposite folding surfaces. In this way, either one of the first folding portion and the second folding portion can offset the fluctuations caused by the other without greatly affecting the deformation of the first folding portion or the second folding portion itself.

[0028] Hereinafter, each embodiment of the present application will be described in detail in combination with the drawings. However, as those skilled in the art can understand, in order to enable readers to better understand the present application, a number of technical details are proposed in the embodiments of the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed by the embodiments of the present application can be realized.

[0029] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and should not be understood as explicitly or implicitly indicating relative importance, or implicitly indicating the number of the indicated technical features, a specific order, or the primary-secondary relationship. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically limited otherwise.

[0030] As used herein, the term "example" means that a particular feature, structure, or characteristic described in combination with the examples can be included in at least one example of the present application. The fact that this phrase appears in various places in the specification does not necessarily mean that all of them refer to the same example, nor does it mean exclusive or alternative examples independent of other examples. Those skilled in the art will explicitly and implicitly understand that the examples described in this specification can be combined with other examples.

[0031] In the description of the embodiments of the present application, the term "and / or" only describes an associated relationship for explaining the related object, meaning that three relationships can exist. For example, A and / or B can mean three situations: the existence of A, the simultaneous existence of A and B, and the existence of B. Also, the symbol " / " in this specification generally represents that the related objects before and after are in an "OR" relationship.

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

[0033] In the description of the embodiments of the present application, the orientation or positional relationship 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", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for the purpose of facilitating and simplifying the description of the embodiments of the present application, and does not indicate or imply that the specified device or component must be configured and 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 there are specific and clear regulations and limitations, technical terms such as "attachment", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integrated one. Also, it may be a mechanical connection or an electrical connection. Further, it may be directly connected, indirectly connected through an intermediate medium, or a relationship of communication inside two components or interaction between two components. A person skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0035] In the drawings corresponding to the embodiments of the present invention, for better understanding and easier explanation, the thickness and area of the layers are enlarged. When describing that one component (for example, a layer, film, region, or substrate) is in another component or on the surface of another component, this component may be "directly" disposed on the surface of the other component, or a third component may exist between the two components. Conversely, when describing that one component is on the surface of another component, or when another component is formed or installed on the surface of one component, it indicates that there is no third component between these two components. Also, when it is described that one component is "substantially" formed in another component, it means that this component is not formed on the entire surface (or front surface) of the other component, nor on a part of the edge of the entire surface.

[0036] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise stated, other components are not excluded and there is a possibility that other components are further included. Also, when a component such as a layer, film, region, or plate is said to be "in / positioned in" another component, it means that it is "directly" in the other component (that is, there is no other component between it and the surface of the other component), or a third component may exist between them. Also, when a component such as a layer, film, region, or plate is "directly positioned" in another component, or when a component such as a layer, film, region, or plate is positioned on the surface of another component, it means that there is no other member intervening between them.

[0037] In this specification, the terms used in the various foregoing embodiments are used only for the purpose of describing specific 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 a plurality of forms unless specifically indicated otherwise in the context. Here, the member includes components such as a layer, a film, a region, or a 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, according to some embodiments of the present application, embodiments of the present application provide a connection member for electrically connecting output ends between two cell groups. This connection member includes a main body portion 100 (see FIG. 3), a first bending portion 101 and a second bending portion 102, a first connection portion 111, and a second connection portion 112. Here, the main body portion 100 includes a first side 11 and a second side 12 that are oppositely installed. 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 a second direction. The first bending portion 101 and the second bending portion 102 are located at the first end and the second end of the main body portion 100. The first bending portion 101 is connected to the first end of the main body portion and is folded back from the first end toward the second direction on the first side 11. The second bending portion 102 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 12. The first connection portion 111 is connected to one end of the first bending portion 101 away from the main body portion 100. The first connection portion 111 is bent along a third direction from one end of the first bending portion 101 away from the main body portion 100. The third direction is a direction from the second side 12 toward the first side 11. The second connection portion 112 is connected to one end of the second bending portion 102 away from the main body portion 100. The second connection portion 112 is bent along a fourth direction from one end of the second bending portion 102 away from the main body portion 100. The fourth direction is a direction from the first side 11 toward the second side 12.

[0040] In some embodiments, the connection member is generally used to be electrically connected to the total output end between two cell modules, and the connection 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 total output end of one cell module, and the other end of the connection member is electrically connected to an external connection device, and the external connection device may include a shunt, a control end, or the total output end of an energy storage battery pack, etc.

[0042] In some embodiments, the connection member may be a copper bar, and the copper bar has the characteristics of metallic copper. First, copper has low electrical resistance and small losses in the process of transporting current. Second, because the price is low, the manufacturing cost of the entire battery pack is low. And, because it has a large current-carrying capacity, it can ensure that the current of one cell module is transported through the copper bar without bringing a large safety risk. Finally, the heat dissipation and heat conduction capabilities of the copper bar itself are good, which can avoid the heat problem of the connection member itself, and can also improve the stability and safety of the cell module including the connection member.

[0043] In some embodiments, the total output end is electrically connected to other cell modules or devices and is used to realize the output or input of power. The total output end includes a total positive output end or a total negative output end. The connection member can be electrically connected to the total positive output end or can be electrically connected to the total negative output end.

[0044] In some embodiments, the connecting member includes a first bending portion 101, a second bending portion 102, and by combining the first bending portion 101 and the second bending portion 102, 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 is converted from the arrangement direction between the two cell modules to the vertical direction and the horizontal direction. As a result, even when the width direction of the main body portion is in the vertical direction of the cell module, it is possible to increase the length of the connecting member in the length direction of at least one cell module and the height of the cell module. Compared with the conventional technical solution 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 a sufficient length to ensure the capacitance between the total output ends, thus avoiding problems such as heat problems and conduction losses caused by an overly large capacitance of the cell module.

[0045] In addition, by changing the structure of the connecting member and the special bending direction, the gap between the two cell modules does not need to occupy a large space due to the capacitance problem and the mounting problem of the connecting member. Therefore, the gap between the two cell modules can be shortened, a part of the space in the length direction of the cell module can be reduced and given to other members, and the integration degree of the cell module can be increased.

[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 direction and the horizontal direction, the areas of the first side 11 and the second side 12 do not need to be reduced to avoid interference between the low-voltage connector and the connecting member and the low-voltage connector. Therefore, 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, increasing the cross-sectional area of the connecting member and reducing the electrical resistance of the connecting member.

[0047] In some embodiments, the first bending portion 101 is folded back from the first side 11 along the third direction towards the second direction (i.e., the first bending portion 101 is folded back from the first end along the second direction at the first side 11), and the second bending portion 102 is folded back from the second side 12 along the fourth direction towards the second direction (i.e., the second bending portion 102 is folded back from the second end along the second direction at the second side 12). The folding surfaces of the first bending portion 101 and the second bending portion 102 are opposite folding surfaces, because the fourth direction and the third direction are opposite directions. Thereby, either one of the first bending portion 101 and the second bending portion 102 can cancel out the variation caused by the other without significantly affecting the deformation of the first bending portion 101 or the second bending portion 102 itself.

[0048] Also, due to the design of the first bending portion 101 and the second bending portion 102, direct contact between the main body portion 100 and the cell module can be avoided, and there is a thickness of at least one connecting member between them. Therefore, the contact area between the main body portion 100 and the cell module and the contact area between the connecting member and the cell module can be reduced, contributing to avoiding the interference problem and the heat problem between the connecting member and each member of the cell module. Due to the bending design of the first bending portion 101 and the second bending portion 102, a certain gap is provided between the main body portion 100 and the cell module. This gap contributes to the heat dissipation of the connecting member itself, avoids the jitter of the cell module caused by the jitter of the connecting member, and can improve the stability of the cell module.

[0049] In some embodiments, the first connecting portion 111 is bent along the third direction from one end of the main body portion of the first bending portion 101 away from the main body portion, and the third direction is the direction from the second side 12 towards the first side 11. The second connecting portion 112 is bent along the fourth direction from one end of the main body portion of the second bending portion 102 away from the main body portion, and the fourth direction is the direction from the first side 11 towards the second side 12. From this, it can be seen that the bending directions of the first connecting portion 111 and the second connecting portion 112 are opposite bending directions. Thereby, since both the direction in which the force of both is biased and the direction of deformation are opposite directions, the structural strength of the connecting member can be increased, and since the connecting member is also deformed from two different directions, interference between the two first connecting portions 111 and the second connecting portion 112 can be avoided.

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

[0051] In some embodiments, as shown in FIG. 3, the included angle between the first bending portion 101 and the first side 11 is the first included angle α1, and the included angle between the second bending portion 102 and the second side 12 is the second included angle α2. At least one of the first included angle and the second included angle is 0° to 30°, for example, it may be 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 bending portion 101 can satisfy and offset the mounting tolerance between the two cell modules, and the deformation of the first bending portion 101 does not exceed the degree of deformation of the connecting member itself, so that the connecting member itself can have great strength and structural strength. At the same time, it is necessary to ensure that there is no interference problem between the edge of the first bending portion 101 and the second bending portion 102 and the cell module in the degree of deformation of the first bending portion 101. Similarly, since the degree of deformation of the second bending portion 102 also has the same technical effect as that of the first bending portion 101, it will not be repeatedly described here.

[0052] In some embodiments, as shown in FIG. 4 or FIG. 5, the bending angle of the first bending portion 101 is the first bending angle β1, the bending angle of the second bending portion 102 is the second bending angle β2, and at least one of the first bending angle β1 and the second bending angle β2 is 0° to 90°, for example, 0°, 20°, 30°, 45°, 53°, 66°, 90°, etc. When either one of the first bending angle β1 and the second bending angle β2 is within the above range, the length of the first bending portion 101 itself in the first direction will not be long, the main body portion 100 can have a large space, and the length of the connecting member can be increased. Similarly, since the degree of deformation of the second bending portion 102 also has the same technical effect as that of the first bending portion 101, it will not be repeatedly described here.

[0053] In some embodiments, the extending direction of the length of the main body portion 100 may not be perpendicular to the second direction, that is, the first direction may intersect the second direction, and the intersecting angle is 0° to 90°. When the extending direction of the length of the main body portion 100 and the second direction are perpendicular, the connecting member can be provided with a long length for transporting current by combining the first bending portion 101 and the second bending portion 102.

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

[0055] Similarly, for the thickness of the main body portion 100, the thickness of the first bending portion 101, the thickness of the second bending portion 102, the thickness of the first connecting portion 111, and the thickness of the second bending portion 102, those skilled in the art can set them according to actual needs. In the present application, it is not specifically limited thereto.

[0056] In some embodiments, as shown in FIG. 1, the distance in the third direction between the first bending portion 101 and the first side 11 is the first distance L1, the distance in the third direction between the first bending portion 101 and the second bending portion 102 is the second distance L2, and the range of the ratio of the first distance L1 to the second distance L2 is 1% to 50%. The range of the ratio of the first distance L1 to the second distance L2 may be, for example, 1%, 10%, 23%, 38%, 43%, 50%, etc. If the range of the ratio of the first distance L1 to the second distance L2 is within any of the above ranges, the first bending portion 101 has a large space for deformation, can relax the mounting tolerance between the two cell modules, can increase the yield of the cell modules, and at the same time, due to the distance between the first bending portion 101 and the main body portion, a gap can be provided between the main body portion and the cell module, and the heat dissipation of the connecting member can be improved.

[0057] In some embodiments, as shown in FIG. 1 or FIG. 6, the distance between the second bending portion 102 and the second side 12 is the fifth distance L5, the range of the ratio of the fifth distance L5 to the second distance L2 is 1% to 50%, and may be, for example, 1%, 10%, 23%, 38%, 43%, 50%, etc. If the range of the ratio of the fifth distance L5 to the second distance L2 is within any of the above ranges, the second bending portion 102 has a large space for deformation, can relax the mounting tolerance between the two cell modules, can increase the yield of the cell modules, and at the same time, due to the distance between the second bending portion 102 and the main body portion 100, a gap can be provided between the main body portion 100 and the cell module, and the heat dissipation of the connecting member can be improved.

[0058] In some embodiments, the range of the first distance L1 is from 0 mm to 2.5 mm, and for example, it may be 0 mm, 0.8 mm, 1.3 mm, 1.6 mm, 2.0 mm, 2.5 mm, etc. If the first distance L1 is within the above range, a gap can be provided between the first bending portion 101 and the main body portion 100 to avoid interference and improve the heat dissipation function of the connecting member. If the first distance L1 is within the above range, the distance between the two cell groups can be further shortened, and more cells can be integrated within a limited space, so that the energy storage battery pack can have a larger battery capacity.

[0059] In some embodiments, as shown in FIG. 4, the distance between the first connecting portion 111 (see FIG. 1) and the main body portion 100 is the third distance L3, and the distance between the second connecting portion 112 (see FIG. 1) and the main body portion 100 is the fourth distance L4. The range of at least one of the third distance L3 and the fourth distance L4 is from 2 mm to 100 mm. The lengths of the third distance L3 and the fourth distance L4 are used to ensure that there is no interference problem between the main body portion 100 and the low-voltage connector on the end plate, and to appropriately set the length of the connecting member itself. The appropriate length means that the length of the connecting member can meet the energization needs of the connecting member and can prevent waste of materials caused by the length of the connecting member being too long.

[0060] In some embodiments, as shown in FIG. 2 or FIG. 5, the main body portion 100 includes a first buffer structure 103 located between the first bending portion 101 and the second bending portion 102. The first buffer structure 103 is used to reduce the influence of jitter between two adjacent cell modules, and the first buffer structure 103 can avoid the problem that the welding location between the connecting member and the cell module is cut off.

[0061] In some embodiments, the first direction and the third direction form a reference plane, and the shape of the orthographic projection pattern on the reference plane of the first buffer structure 103 includes a waveform or a polyline shape. The first buffer structure 103 can be designed to effectively utilize the material area, and the first buffer structure 103 has no relation to the cutting of the main body 100. The first buffer structure 103 is a bending design and deformation process for the main body 100. The connecting member still has a structure integrally formed without cracks. The capacitance of the connecting member itself remains unchanged, and the internal resistance of the connecting member is also small. Since the strength of the connecting member itself is increased, the stability and reliability of the cell module can be improved.

[0062] In some embodiments, the connecting member further includes a second buffer structure located at least on one of the first bending portion 101 and the second bending portion 102. By providing the second buffer structure, the stability and reliability of the connecting member can be further improved.

[0063] In some embodiments, the shape of the orthographic projection pattern on the reference plane of the second buffer structure includes a waveform or a polyline shape.

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

[0065] As shown in FIG. 1, the first connection portion 111 and the second connection portion 112 have mounting holes for riveting with an output connection member. Taking the mounting hole of the first connection portion 111 as an example, the distance in the first direction between the edge of the mounting hole and the edge of the first connection portion 111 is the first edge distance S1, and the first edge distance S1 ≥ 20 mm. The distance in the third direction between the edge of the mounting hole and the edge of the first connection portion 111 is the second edge distance S2, and the second edge distance S2 ≥ 20 mm. If the first edge distance S1 and the second edge distance S2 are within the above ranges, the probability of the edge being damaged when a screw is mounted later can be reduced.

[0066] In some embodiments, the width and thickness of the connection member (the cross-sectional area of the connection member) can be set according to the power demand of the entire cell module. In the present application, it is not limited thereto.

[0067] In the connection member provided in the embodiment of the present application, the connection member includes a main body portion 100, a first bending portion 101, a second bending portion 102, a first connection portion 111, and a second connection portion 112. 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 a second direction. The first bending portion 101 and the second bending portion 102 are located at the first end and the second end of the main body portion 100. The first bending portion 101 is connected to the first end of the main body portion and is folded back from the first end toward the second direction on the first side 11. The second bending portion 102 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 12. The first connection portion 111 is bent along a third direction from one end of the first bending portion 101 away from the main body portion 100. The third direction is a direction from the second side 12 toward the first side 11. The second connection portion 112 is bent along a fourth direction from one end of the second bending portion 102 away from the main body portion 100. The fourth direction is a direction from the first side 11 toward the second side 12. Thereby, the length of the connection member is not limited to the gap between the cell modules, that is, the length direction of the connection member is converted from the arrangement direction between the two cell modules to the vertical direction and the horizontal direction. For this reason, the width direction of the main body portion may also be the vertical direction of the cell module. In this way, the length in the length direction of the connection member can be increased to at least the length of one cell module and the height of the cell module. Compared with the conventional technical solution in which the connection member electrically connects adjacent cell modules along the horizontal direction, the length of the connection member can be increased, and the connection member has a sufficient length to ensure the energization capacitance between the total output ends, and problems such as heat problems and energization losses caused by an overly large energization capacitance of the cell module can be avoided.

[0068] Further, the first bending portion 101 is folded back from the first end in the second direction on the first side 11, and the second bending portion 102 is folded back from the second end in the second direction on the second side 12. Since the gap between the two cell modules does not need to occupy a large space due to the problem of the capacitance of the connection member and the problem of attachment, the gap between the two cell modules can be shortened. Thereby, a part of the space in the length direction of the cell module can be reduced and given to other members, enhancing the integration degree of the cell module. The folded surface of the first bending portion 101 and the folded surface of the second bending portion 102 are opposite folded surfaces. In this way, either one of the first bending portion 101 and the second bending portion 102 can cancel out the variation caused by the other without significantly affecting the deformation of the first bending portion 101 or the second bending portion 102 itself.

[0069] Correspondingly, according to some embodiments of the present application, in another aspect of the embodiments of the present application, a cell module including the connection member provided in the above embodiments is further provided. For the same technical features or corresponding technical features as those in the above embodiments, they will not be repeatedly described here.

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

[0071] As shown in FIG. 7, the cell module includes at least two cell groups and the connection member according to any one of the above embodiments. The cell group includes an output end, the output end includes an output connection member 23, and both ends of the connection member 10 are electrically in contact with the output connection members 23 of the two cell groups respectively.

[0072] In some embodiments, a cell group refers to a plurality of cells sequentially arranged along a fifth direction. The plurality of cells are connected in series via busbar connection members. Each cell includes a positive electrode, a negative electrode, and an explosion vent. Both ends of the busbar connection member are electrically connected to the electrodes of two cells respectively. For example, the busbar connection 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 busbar connection member may be an aluminum bar. The aluminum bar has low electrical resistance, low cost, and high weldability with the materials between the aluminum bar and the positive and negative electrodes. The aluminum bar can reduce the contact resistance between the busbar connection member and the cell.

[0074] In some embodiments, both ends of the cell group are provided with a total output terminal. The total output terminal is one electrode of the outermost cell. An output connection member is connected to the total output terminal, and the output connection member may be an aluminum bar.

[0075] In some embodiments, the output connection member and the connection member are connected by implanted bolts, ultrasonic welding, or thermocompression bonding. As shown in FIG. 7, in this application, the connection between the output connection member 23 and the connection member 10 fixed by the implanted bolt 24 will be taken as an example for explanation.

[0076] In some embodiments, since the output connection member 23 and the connection member 10 are integrally formed and installed, during the assembly process of the cell module, there is no need to separately perform the operation of assembling the connection member to the output connection member, which can save the assembly time of the cell module and improve the assembly efficiency. At the same time, since there is no need to install implanted bolts on the output connection member, the height of the cell module can be reduced, that is, the occupied space can be reduced. When assembling the cell module, since there is no need to assemble the implanted bolts with tools, the space required for assembly can be further saved, meeting the requirements of space limitation when assembling the cell module vertically, and reducing the installation cost. When assembling the cell module vertically into the case of the battery pack, the reserved space between two opposing cell modules can be reduced, and the two cell modules can be assembled more compactly to reduce the volume of the battery pack.

[0077] Also, since the output connection member and the connection member are integrally formed and installed, the surface of the connection member and the surface of the output connection member are in close contact at the connection location, and the molecules of the output connection member and the connection member at the connection location are also in close contact, effectively avoiding the progress of the redox reaction, that is, avoiding corrosion at the connection location. Thereby, the connection location between the output connection member and the connection member can be effectively protected, and the service life of the cell module can be extended.

[0078] In some embodiments, the cell module further includes an end plate 22 and an output base 21. The end plate 22 is located at both ends of the cell group, the first connection portion 111 (see FIG. 1) of the connection member 10 is located on the end plate 22, and the output base 21 is located on the end plate 22. Since the upper 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, which is 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, namely an upper surface and a lower surface. 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 the welding performance between aluminum and copper is common, since 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, 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 can be improved, and furthermore, the contact performance between the output connection member and the connection member can be enhanced.

[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 a plurality of cells arranged along the third direction. In some embodiments, referring to FIG. 8, the cell group includes two rows of a plurality of cells arranged along the third direction. In this way, the connection member can be installed based on different cells, and the present invention has high practicality.

[0082] Correspondingly, according to some embodiments of the present application, in another aspect of the embodiments of the present application, an energy storage battery pack including the cell module provided in the above embodiments is further provided. For the same technical features or corresponding technical features as those in the above embodiments, they will not be repeatedly described here.

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

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

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

[0086] Although the present application is disclosed as described in the preferred embodiments, it is not used to limit the scope of the claims. Any person skilled in the art can make some possible changes and modifications without departing from the concept of the present application. Therefore, the protection scope 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 each of the above embodiments is a specific embodiment for implementing the present application, but in practice, various changes can be made in form and details without departing from the scope of the present application. Any person skilled in the art can make changes and modifications respectively without departing from the scope of the present application. Therefore, the protection scope of the present application should be based on the scope limited by the claims.

Claims

1. A connection member for electrically connecting output ends between two cell groups, a main body portion, a first bent portion, a second bent portion, a first connection portion, and a second connection 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 extending 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, respectively, the first folded portion is connected to the first end of the main body portion and is folded back from the first end toward the second direction on the first side, and the second folded 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 connection portion is connected to one end of the first bent portion away 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 away from the main body portion, the second connection portion is bent from the one end of the second bent portion along a fourth direction, the fourth direction being a direction from the first side toward the second side, 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°; 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°; 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 first distance is in the range of 0 mm to 2.5 mm; The main body portion includes a first buffer structure located between the first folded portion and the second folded portion. A connecting member characterized by:

2. 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 connection member according to claim 1 .

3. Further comprising a second buffer structure located at least one of the first folded portion and the second folded portion. The connection member according to claim 1 .

4. 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 connection member according to claim 1 .

5. At least two cell groups and the connection member according to any one of claims 1 to 4, The cell group includes an output end, the output end 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 comprising:

6. the end plates are located at both ends of the cell group, a first connection portion of the connection member is located at the end plates, the output base is located at the end plates, and an upper surface of the main body portion of the connection member is not higher than a bottom surface of the output base, The cell module according to claim 5 .

7. a connection structure is disposed 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 5 .

8. The connection structure surrounds the first connection portion, or the connection structure surrounds the second connection portion. The cell module according to claim 7 .

9. The cell group includes at least one column of cells arranged along the third direction. The cell module according to claim 5 .

10. The cell group includes two rows of cells arranged along the third direction. The cell module according to claim 9 .

11. A cell module comprising a plurality of the cell modules according to claim 5.

1. An energy storage battery pack comprising:

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