Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, and relates to the technical field of batteries, the battery module comprises end plates, pressing strips and battery cells, the plurality of battery cells are sequentially arranged along a first direction to form a battery cell group; the two end plates abut against the two ends of the battery cell group respectively; the pressing strip comprises a pressing strip body and a connecting assembly, the pressing strip body extends in the first direction, and the connecting assembly is connected to at least one end, in the first direction, of the pressing strip body; the pressing strip abuts against the battery cell set, and the connecting assembly is movably connected with the side, away from the battery cell set, of the end plate in an abutting mode. According to the battery module provided by the utility model, the anti-expansion capability of the battery module in all directions is improved through the interaction of the end plates and the pressing strips, and the stable and reliable structure of the battery module in the whole life cycle is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] As the new energy vehicle market develops rapidly, the safety of power battery systems has always been the focus of the industry. Battery module assembly technology is an important direction for battery pack integrated design. Since the battery module has side panels or straps for constraints, its structural stability is better than that of the CTP battery pack.

[0003] In the related art, the group design method of battery modules usually adopts a heavy end and side plate solution, or lightweights them, which leads to insufficient restraint on the battery cells, causing insufficient structural strength of the battery module throughout its life cycle, and then causing irreversible expansion and deformation, or affecting the cycle life of the battery module. Utility Model Content

[0004] The embodiments of the utility model provide a battery module and a battery pack, which can improve the structural strength and cycle life of the battery module.

[0005] In a first aspect, an embodiment of the utility model provides a battery module, including an end plate, a pressure strip and a battery cell;

[0006] The plurality of battery cells are arranged in sequence along a first direction to form a battery cell group;

[0007] The two end plates are respectively abutted against two ends of the battery cell group;

[0008] The pressure strip comprises a pressure strip body and a connecting assembly, wherein the pressure strip body extends along the first direction, and the connecting assembly is connected to at least one end of the pressure strip body in the first direction;

[0009] The pressure strip is pressed against the battery cell group, and the connecting component is movably abutted against a side of the end plate away from the battery cell group.

[0010] In some embodiments, the connection assembly includes a preload and a connection portion;

[0011] The connecting portion is connected to at least one end of the pressure strip body, the pre-tightening member is movably connected to the connecting portion along the first direction, and the end of the pre-tightening member away from the connecting portion abuts against the end plate.

[0012] In some embodiments, a protruding structure extending along the first direction is further provided on the end plate, and an end of the protruding structure facing away from the end plate is inserted into the connecting portion.

[0013] In some embodiments, a connecting hole is formed on the connecting portion, the protruding structure is inserted into a portion of the connecting hole, and the preload member is inserted into another portion of the connecting hole and abuts against the protruding structure.

[0014] In some embodiments, the preload member is threadedly connected to the connecting hole.

[0015] In some embodiments, the pressure strip body includes a first pressure strip portion and a second pressure strip portion, the first pressure strip portion and the second pressure strip portion respectively extend along the first direction, the second pressure strip portion is connected to one side of the first pressure strip portion, the first pressure strip portion and the second pressure strip portion respectively press against the adjacent two sides of the battery cell group, and the two sides of the connecting component are respectively connected to the first pressure strip portion and the second pressure strip portion.

[0016] In some embodiments, the connection assembly includes a connection portion;

[0017] The two sides of the connection portion are respectively connected to the first pressure strip portion and the second pressure strip portion, and the connection portion, the first pressure strip portion and the second pressure strip portion are perpendicular to each other.

[0018] In some embodiments, the number of the pressure strips is at least two, and the at least two pressure strips are located at diagonally opposite corners of the battery cell group.

[0019] In some embodiments, the battery module further includes an adhesive layer, and the adhesive layer is disposed between the pressure strip and the battery cell group.

[0020] In a second aspect, an embodiment of the present invention provides a battery pack, comprising the battery module as described above.

[0021] Beneficial effects of the embodiments of the utility model:

[0022] In an embodiment of the utility model, a cell group is formed by arranging the cells in sequence along a first direction, and then a cell frame of the cell group is formed by two end plates abutting at both ends of the cell group and a pressure strip connecting the two end plates, thereby providing a restraining effect on all directions of the cell group, and the pressure strip and the end plate are movably abutted by a connecting component arranged at at least one end of the pressure strip body, and the connecting component brings the end plates at both ends close to each other through the movably abutting end plate until the cell group is clamped, thereby increasing the binding force on the cell group along the first direction, and further enhancing the restraining effect on the cell group in the first direction, thereby ensuring the anti-expansion ability of the battery module in all directions, and ensuring that the structure of the battery module is stable and reliable throughout its life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a three-dimensional schematic diagram of a battery module provided by an embodiment of the utility model;

[0025] Figure 2 is an exploded view of a battery module provided by an embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the structure of the layering strip provided in an embodiment of the utility model;

[0027] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0028] Figure 5 It is a structural schematic diagram of an end plate provided in an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the structure of a battery pack provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0031] like Figure 1-2 As shown, the embodiment of the utility model provides a battery module 10, including an end plate 1, a pressure strip 2 and a battery cell 3;

[0032] The plurality of battery cells 3 are sequentially arranged along a first direction X to form a battery cell group 4;

[0033] The two end plates 1 are respectively abutted against two ends of the battery cell group 4;

[0034] It should be noted that the shape of the end plate 1 can match the shape of the battery cell 3. For example, when the battery cell 3 is a square battery cell, the end plate 1 is also square; and further, the size of the end plate 1 also matches the size of the battery cell 3. By setting the sizes of the end plate 1 and the battery cell 3 to match, the restraining effect of the end plate 1 on the battery cell 3 can be improved.

[0035] like Figure 3 As shown, the pressure strip 2 includes a pressure strip body 21 and a connecting component 22, the pressure strip body 21 extends along the first direction X, and the connecting component 22 is connected to at least one end of the pressure strip body 21 in the first direction X;

[0036] The pressure strip 2 is pressed against the battery cell group 4 , and the connecting component 22 is movably abutted against a side of the end plate 1 away from the battery cell group 4 .

[0037] It can be understood that the connection component 22 can be connected to only one end of the layering body 21 in the first direction X, or can be connected to both ends of the layering body 21 in the first direction X. When the connection component 22 is connected to only one end of the layering body 21 in the first direction X, the layering body 21 at the other end can be connected to the end plate 1 in a fixed connection manner, and the end with the connection component 22 is movably abutted against the end plate 1; when the connection component 22 is connected to both ends of the layering body 21 in the first direction X, the connection components 22 at both ends are movably abutted against the two end plates 1 respectively.

[0038] For example, Figure 1 and 2 As shown, the battery cell 3 is a square battery cell, and a plurality of battery cells 3 are arranged in sequence along the thickness direction to form a battery cell group 4 , and two end plates 1 are respectively abutted against two ends of the battery cell group 4 .

[0039] like Figure 3 As shown, the pressure strip 2 includes a pressure strip body 21 and a connecting component 22, wherein the pressure strip body 21 extends along a first direction X, and the connecting component 22 is connected to at least one end of the pressure strip body 21 in the first direction X. In other words, the connecting component 22 and the pressure strip body 21 are integral, and two connecting components 22 are respectively connected to two ends of the pressure strip body 21.

[0040] The pressure strip 2 is pressed against the cell group 4, and the connecting component 22 is movably abutted against the side of the end plate 1 away from the cell group 4. By buckling the pressure strip 2 on the cell group 4 and movably abutting the pressure strip 2 against the end plate 1 through the connecting component 22, the end plate 1 and the pressure strip 2 form a cell frame for constraining the cell group 4, providing a restraining effect on the cell group 4 in all directions, and the connecting component 22 arranged at the end of the pressure strip body 21 movably abuts the end plate 1 to make the end plates 1 at both ends approach each other until the cell group 4 is clamped, thereby improving the binding force on the cell group 4 along the first direction X, and further improving the restraining effect of the pressure strip 2 and the end plate 1 on the cell group 4 in the first direction X, thereby ensuring the anti-expansion ability of the battery module 10 in all directions, and ensuring that the battery module 10 has a stable and reliable structure throughout its life cycle.

[0041] Preload force is one of the important design parameters of the battery module 10, and has a significant impact on the cycle life and initial stiffness of the battery module 10. However, in related technologies, the battery module 10 is usually designed with a fixed preload force, and it is impossible to adjust the initial preload force of the battery module 10 to match the size fluctuations of the incoming materials.

[0042] In some embodiments, Figure 3 As shown, the connecting assembly 22 includes a pre-tightening member 221 and a connecting portion 222; the connecting portion 222 is connected to at least one end of the pressure strip body 21, the pre-tightening member 221 is movably connected to the connecting portion 222 along the first direction X, and the end of the pre-tightening member 221 away from the connecting portion 222 abuts against the end plate 1.

[0043] That is to say, the connecting portion 222 is connected to the pressure strip body 21, and is connected to the connecting portion 222 along the first direction X through the pre-tightening member 221, and the end of the pre-tightening member 221 away from the connecting portion 222 is abutted against the end plate 1, thereby realizing the connection between the pressure strip 2 and the end plate 1. At the same time, the pre-tightening member 221 is used to realize the flexible adjustment of the pre-tightening force of the battery module 10, thereby solving the problems of excessive or insufficient pre-tightening force that are prone to occur when the size of the incoming materials fluctuates, and avoiding the cycle life affected by the excessive or insufficient pre-tightening force of the battery module 10.

[0044] In some embodiments, Figure 5 As shown, a protruding structure 11 extending along the first direction X is further provided on the end plate 1 , and one end of the protruding structure 11 away from the end plate 1 is inserted into the connecting portion.

[0045] By providing a protruding structure 11 on the end plate 1 and inserting the end of the protruding structure 11 away from the end plate 1 into the connecting portion 222, a positioning function can be provided for the end plate 1 and the pressure strip 2, thereby better realizing the connection between the two.

[0046] It should be noted that the shape of the protrusion structure 11 can be cylindrical, square column or other shapes.

[0047] Furthermore, if Figure 3 and 4 As shown, a connecting hole 2221 is formed on the connecting portion 222 , the protruding structure 11 is inserted into a portion of the connecting hole 2221 , and the pre-tightening member 221 penetrates into another portion of the connecting hole 2221 and abuts against the protruding structure 11 .

[0048] On the one hand, the protruding structure 11 inserted into the connection hole 2221 plays a positioning role, and on the other hand, the preload member 221 and the protruding structure 11 abut against each other in the connection hole 2221, thereby realizing the connection between the end plate 1 and the pressure strip 2, and the structure is more compact.

[0049] In addition, when the battery cell group 4 expands, it will generate outward expansion pressure on the pressure strips 2 distributed around the battery cell group 4, thereby increasing the radial force of the pre-tightening member 221, thereby affecting the pre-tightening adjustment and removal of the pre-tightening member 221. The protruding structure 11 provided on the end plate 1 can not only play a positioning role, but also improve the radial limiting role, and can reduce the radial force of the pre-tightening member 221 when the battery module 10 is non-uniformly deformed when the battery cell group 4 expands and deforms, thereby reducing the impact of the expansion of the battery cell group 4.

[0050] In some embodiments, the preload member 221 is threadedly connected to the connecting hole 2221 .

[0051] The preload member 221 is threadedly connected to the connecting hole 2221, and the preload member 221 is connected to the pressure strip 2 and pressurizes the end plate 1 to achieve the connection between the pressure strip 2 and the end plate 1. At the same time, the connecting hole 2221 cooperates with the protruding structure 11 to achieve the positioning effect. The preload member 221 is connected to the connecting hole 2221 by a threaded connection, which is convenient for flexible adjustment of the preload force.

[0052] Exemplarily, the pre-tightening member 221 may be a tightening adjustment bolt, and the connecting hole 2221 may be a threaded hole.

[0053] In some embodiments, Figure 3 As shown, the pressure strip body 21 includes a first pressure strip portion 211 and a second pressure strip portion 212, the first pressure strip portion 211 and the second pressure strip portion 212 extend respectively along the first direction X, the second pressure strip portion 212 is connected to one side of the first pressure strip portion 211, the first pressure strip portion 211 and the second pressure strip portion 212 respectively press against the adjacent two sides of the battery cell group, and the two sides of the connecting component 22 are respectively connected to the first pressure strip portion 211 and the second pressure strip portion 212.

[0054] The first pressure strip portion 211 and the second pressure strip portion 212 are respectively pressed against the adjacent two sides of the battery cell group 4. The first pressure strip portion 211 and the second pressure strip portion 212 can respectively provide constraints on the battery cell group 4 in different directions, and at the same time improve the structural strength in two directions. Through the mutual cooperation of multiple pressure strips 2, the battery cell group 4 can form a more stable whole, and the overall rigidity of the battery module 10 can be significantly improved.

[0055] Furthermore, the connection assembly 22 includes a connection portion 222 ; two sides of the connection portion 222 are respectively connected to the first pressure strip portion 211 and the second pressure strip portion 212 , and the connection portion 222 , the first pressure strip portion 211 and the second pressure strip portion 212 are perpendicular to each other.

[0056] For example, Figure 3 As shown, the first beading portion 211 and the second beading portion 212 are perpendicular to each other, that is, the beading body 21 is an "L"-shaped structure, and the connecting portion 222 is perpendicular to the first beading portion 211 and the second beading portion 212. For the battery cell group 4 composed of square battery cells, the mutually perpendicular first beading portion 211 and the second beading portion 212 can improve the structural strength in two directions. At the same time, the mutually perpendicular first beading portion 211, the second beading portion 212 and the connecting portion 222 can play a role in positioning and limiting the end plate 1 in three directions, thereby improving the structural stability of the battery module 10.

[0057] It should be noted that the widths of the first pressure strip portion 211 and the second pressure strip portion 212 can be the same or different; in actual application, the widths and relative positions of the first pressure strip portion 211 and the second pressure strip portion 212 can be adjusted according to the size of the constraint effect provided in different directions as needed.

[0058] In some embodiments, at least two of the pressure strips 2 are provided, and at least two of the pressure strips 2 are respectively located at diagonally opposite corners of the battery cell group 4 .

[0059] Since the pressure strip 2 includes the first pressure strip portion 211 and the second pressure strip portion 212, and the first pressure strip portion 211 and the second pressure strip portion 212 can provide constraints on the battery cell group 4 in two different directions, the two pressure strips 2 arranged diagonally can provide good clamping and fixing effects on the battery cell group 4, and the pressure strip 2 and the end plate 1 can cooperate to provide constraints in all directions for the battery cell group 4.

[0060] It is understandable that by increasing the number of pressure strips 2, the stability of the structure can be further improved, providing a better restraint effect for the battery cell group. Figure 1-2 As described above, a pressure strip 2 is disposed at each of the four corners of the battery cell group 4 consisting of square battery cells.

[0061] In some embodiments, Figure 2 As shown, the battery module 10 further includes an adhesive layer 6 , and the adhesive layer 6 is disposed between the pressure strip 2 and the battery cell group 4 .

[0062] That is, the pressure strip 2 and the battery cell group 4 are bonded together by the adhesive layer 6 to form a sandwich structure, so that the pressure strip 2 and the battery cell group 4 form a whole; for example, Figure 2 As shown, an adhesive layer 6 is provided between the "L"-shaped pressure strip 2 and the cell group 4 composed of square cells. The adhesive layer 6 bonds the pressure strip 2 and the cell group 4 together, and at the same time makes the multiple cells 3 in the cell group 4 form a whole. The pressure strip 2 not only plays a role in structural stability in the height and width directions of the battery module 10, but also improves the structural stability of the battery module 10 in the length direction.

[0063] In some embodiments, Figure 2 As shown, the battery module 10 further includes foam 7 , and the foam 7 is located between two adjacent battery cells 3 and / or between the end plate 1 and the battery cell 3 adjacent to the end plate 1 .

[0064] The foam 7 can be arranged between the end plate 1 and the battery cell 3 adjacent to the end plate 1, or between adjacent battery cells 3 used to form the battery cell group 4, or at both of the above positions. The foam 7 can limit the gap between the end plate 1 and the battery cell 3, and / or between adjacent battery cells 3, and provide a buffering effect.

[0065] Furthermore, the foam 7 can be a hollow structure, and the foam 7 with a hollow structure only covers the circumferential edge of the battery cell 3 and / or the end plate 1, so that there is a certain gap between adjacent battery cells 3 or between the end plate 1 and the battery cell 3. On the one hand, it can reduce the adjustment pressure when adjusting the preload force. This is mainly because the foam 7 with a hollow structure has a smaller area and only covers the circumferential edge of the end plate 1 and / or the battery cell 3, so the resistance generated during the tightening adjustment process is smaller; on the other hand, a cavity is formed between the end plate 1 and the battery cell 3, and / or between adjacent battery cells 3, thereby improving the overall heat dissipation capacity of the battery module 10 and reserving expansion space between the battery cells 3.

[0066] For example, Figure 2 As shown, the battery cell 3 is a square battery cell, and the foam 7 is a corresponding square frame structure. The foam 7 with the square frame structure is arranged between adjacent battery cells 3 and between the end plate 1 and the battery cell 3 at the same time.

[0067] like Figure 6 As shown, an embodiment of the present invention provides a battery pack 100 including the battery module 10 as described above.

[0068] It should be noted that the battery pack 100 may include only one battery module 10 , or may include multiple battery modules 10 at the same time.

[0069] By applying the above-mentioned battery module 10 to the battery pack 100, since the battery module 10 has good anti-expansion ability in all directions and a stable and reliable structure throughout the entire life cycle, the safety and reliability of the battery pack 100 are improved.

[0070] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery module, characterized in that: Including end plates, pressure strips and battery cells; The plurality of battery cells are arranged in sequence along a first direction to form a battery cell group; The two end plates are respectively abutted against two ends of the battery cell group; The pressure strip comprises a pressure strip body and a connecting assembly, wherein the pressure strip body extends along the first direction, and the connecting assembly is connected to at least one end of the pressure strip body in the first direction; The pressure strip is pressed against the battery cell group, and the connecting component is movably abutted against a side of the end plate away from the battery cell group.

2. The battery module according to claim 1, characterized in that: The connecting assembly includes a pre-tightening member and a connecting portion; The connecting portion is connected to at least one end of the pressure strip body, the pre-tightening member is movably connected to the connecting portion along the first direction, and the end of the pre-tightening member away from the connecting portion abuts against the end plate.

3. The battery module according to claim 2, characterized in that: The end plate is also provided with a protruding structure extending along the first direction, and one end of the protruding structure away from the end plate is inserted into the connecting portion.

4. The battery module according to claim 3, characterized in that: The connecting portion is provided with a connecting hole, the protruding structure is inserted into a part of the connecting hole, and the pre-tightening member is inserted into another part of the connecting hole and abuts against the protruding structure.

5. The battery module according to claim 4, characterized in that: The preload member is threadedly connected to the connection hole.

6. The battery module according to any one of claims 1 to 5, characterized in that: The pressure strip body includes a first pressure strip portion and a second pressure strip portion, the first pressure strip portion and the second pressure strip portion extend along the first direction respectively, the second pressure strip portion is connected to one side of the first pressure strip portion, the first pressure strip portion and the second pressure strip portion respectively press against two adjacent sides of the battery cell group, and the two sides of the connecting component are respectively connected to the first pressure strip portion and the second pressure strip portion.

7. The battery module according to claim 6, characterized in that: The connecting assembly includes a connecting portion; The two sides of the connection portion are respectively connected to the first pressure strip portion and the second pressure strip portion, and the connection portion, the first pressure strip portion and the second pressure strip portion are perpendicular to each other.

8. The battery module according to claim 6, characterized in that: The number of the pressure strips is at least two, and the at least two pressure strips are respectively located at diagonally opposite corners of the battery cell group.

9. The battery module according to any one of claims 1 to 5, characterized in that: The battery module further includes an adhesive layer, and the adhesive layer is arranged between the pressure strip and the battery cell group.

10. A battery pack, characterized in that: Comprising a battery module as described in any one of claims 1 to 9.

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