Battery modules and battery packs

Abstract

The present invention relates to a battery module and a battery pack, the battery module comprising: a plurality of battery cells, a plurality of buffer pads and a fastening band. The plurality of battery cells are arranged in parallel along the thickness direction. The plurality of buffer pads are arranged on one side or both sides of the battery cells along the arrangement direction of the battery cells. The fastening band hoop is arranged on the periphery of the battery cells and the buffer pads. The thickness of the buffer pad is a, the number of the buffer pads is b, the number of battery cells is n, the thickness tolerance of the battery cell is c, and the thickness tolerance of the buffer pad is d, which meet, and the units are all millimeters. The battery module provided by the present invention will not cause the fastening band to be too tight around the battery cell due to the excessive thickness of the buffer pad, causing damage to the inside of the battery cell, and the battery module will not be unable to be fastened by the fastening band due to the excessive thickness of the buffer pad.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery module and a battery pack. Background Art

[0002] In a single module, there are generally multiple battery cells arranged in parallel, and buffer pads are provided at both ends of the module. The buffer pad itself has a certain degree of compressibility, but the compression of the buffer pad generally does not exceed 50%. A tightening belt is generally provided on the outside of the module. Therefore, when the thickness of the buffer pad is too large, the overall length of the module will be too large, which will cause the tightening belt to be too tight on the outside of the module, or even cause the tightening belt to be unable to cover the module. If the tightening belt is too tight, the buffer pad will be compressed to the limit. When the module is in use, the battery cell inside will expand, and the expanded battery cell will further squeeze the buffer pad. At this time, the buffer pad can no longer provide buffering, and the extrusion force generated by the expansion of the battery cell will be transmitted to the inside of the battery cell, causing damage to the internal parts of the battery cell and affecting the service life of the module. When the thickness of the buffer pad is too small, the overall length of the module will be too small, which will cause the tightening belt to be too loose when it is set on the outside of the module. Summary of the invention

[0003] In view of this, it is necessary to provide a battery module and a battery pack to solve the problem that the thickness of the buffer pad is too large, causing the battery module to be easily damaged, or the thickness of the buffer pad is too small, causing the fastening belt to be unable to tighten the battery module.

[0004] The present invention provides a battery module, which includes: a plurality of battery cells, a plurality of buffer pads and a fastening band. The plurality of battery cells are arranged in parallel along the thickness direction. The plurality of buffer pads are arranged on one side or both sides of the battery cells along the arrangement direction of the battery cells. The fastening band hoop is arranged on the periphery of the battery cells and the buffer pads. The thickness of the buffer pad is a, the number of the buffer pads is b, the number of the battery cells is n, the thickness tolerance of the battery cells is c, the thickness tolerance of the buffer pad is d, and it satisfies, and All units are millimeters.

[0005] In one embodiment of the present invention, the cushion includes a first strip segment, a second strip segment, a third strip segment and a fourth strip segment, which are connected end to end and enclose a rectangular structure. With such a configuration, the cushion has a simpler structure and is convenient for processing and manufacturing.

[0006] In one embodiment of the present invention, the first and second segments are attached to the edge area of ​​the battery cell along the width direction of the battery cell, and the third and fourth segments are attached to the edge area of ​​the battery cell along the height direction of the battery cell. This helps to avoid the extrusion force being concentrated in the middle area of ​​the battery cell, causing damage to the internal structure of the battery cell. In addition, this arrangement expands the total coverage area of ​​the buffer pad and the battery cell, which helps to improve the structural strength of the battery module.

[0007] In one embodiment of the present invention, a filling groove is formed between the first segment, the second segment, the third segment, the fourth segment and two adjacent battery cells, and an adhesive is provided in the filling groove to connect adjacent battery cells. This helps to prevent the adhesive from overflowing the filling groove and causing failure of the battery module.

[0008] In one embodiment of the present invention, the area covered by the adhesive in the filling slot is S, and the bottom area of ​​the filling slot is Q, satisfying S≥0.3*Q. The area covered by the adhesive in the filling slot exceeds 30% of the bottom area of ​​the filling slot, which is beneficial to increase the contact area between the adhesive and the adjacent battery cells and improve the structural strength of the battery module.

[0009] In one embodiment of the present invention, 0.4*Q≤S≤0.6*Q. In this way, the amount of adhesive applied to the filling slot can be controlled more accurately to avoid insufficient adhesive affecting the connection strength of the battery cell, and to avoid excessive adhesive causing the adhesive to overflow from the filling slot, affecting the use of the battery module.

[0010] In one embodiment of the present invention, the buffer pad is adhered to the battery cell. With this arrangement, the connection between the buffer pad and the battery cell is simpler and more efficient.

[0011] In one embodiment of the present invention, 10≤n≤40. Thus, by the formula And the formula The calculated thickness range of the cushion is more reasonable.

[0012] In one embodiment of the present invention, c is ±0.3 mm, and d is ±0.2 mm.

[0013] The present invention also provides a battery pack, comprising the battery module described in any one of the above embodiments.

[0014] The battery module and battery pack provided by the present invention have a plurality of buffer pads in the battery module, and the total thickness of the buffer pads is a*b. and When the thickness of the buffer pad is too large, the battery module will not be too tight around the battery cell due to the fastening belt, causing damage to the inside of the battery cell. In addition, the battery module will not be unable to be fastened by the fastening belt due to the thickness of the buffer pad being too small. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the present invention;

[0016] Figure 2 It is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0017] Figure 3 A schematic structural diagram of a battery module according to an embodiment of the present invention;

[0018] Figure 4 for Figure 3 An exploded view of the battery module shown;

[0019] Figure 5 A schematic structural diagram of a battery module according to another embodiment of the present invention;

[0020] Figure 6 for Figure 5 An exploded view of the battery module shown;

[0021] Figure 7 Schematic diagram of the structure of a buffer pad according to an embodiment of the present invention.

[0022] Figure numerals: 100, battery pack; 1, battery module; 11, battery cell; 12, buffer pad; 12a, first segment; 12b, second segment; 12c, third segment; 12d, fourth segment; 13, fastening tape; 14, filling groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly mounted on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] like Figure 2 As shown, the thickness direction of the battery cell 11 is the S direction, and the battery cells 11 are arranged along the thickness direction, so the arrangement direction of the battery cells 11 is also the S direction. The width direction of the battery cell 11 is the R direction. The height direction of the battery cell 11 is the T direction.

[0027] See also Figure 3-6 The present invention provides a battery module 1, which includes: a plurality of battery cells 11, a plurality of buffer pads 12 and a fastening belt 13. The plurality of battery cells 11 are arranged in parallel along the thickness direction. The plurality of buffer pads 12 are arranged on one side or both sides of the battery cells 11 along the arrangement direction of the battery cells 11. It should be noted that "the plurality of buffer pads 12 are arranged on one side or both sides of the battery cells 11 along the arrangement direction of the battery cells 11" includes the following two situations: one is that buffer pads 12 are arranged between all adjacent battery cells 11; the other is that buffer pads 12 are arranged only between some adjacent battery cells 11.

[0028] The fastening band 13 is clamped around the outer periphery of the battery cell 11 and the buffer pad 12. The thickness of the buffer pad 12 is a, the number of the buffer pads 12 is b, the number of the battery cells 11 is n, the thickness tolerance of the battery cell 11 is c, and the thickness tolerance of the buffer pad 12 is d, which satisfies, and All units are millimeters.

[0029] The total length of the battery module 1 along the arrangement direction of the battery cells 11 mainly depends on: the thickness of the battery cells 11, the number of battery cells 11, the thickness of the buffer pads 12, the number of buffer pads 12, the length of the fastening belt 13 along the arrangement direction of the battery cells 11, and the length of other components in the battery module 1 along the arrangement direction of the battery cells 11. It should be noted that in this embodiment, other components refer to components in the battery module 1 that are tightened on the inner side of the fastening belt 13 and are other than the battery cells 11 and the buffer pads 12, such as end plates and insulating plates. The number of battery cells 11 is n, and the thickness tolerance of the battery cells 11 is c. Therefore, the total length error of the battery cells 11 along the arrangement direction is The thickness tolerance of the buffer pad 12 is d, and the number of the buffer pads 12 is b. Therefore, the total length error of the buffer pad 12 along the arrangement direction of the battery cell 11 is The total length error of other components along the arrangement direction of the battery cell 11 is: The length tolerance of the fastening tape 13 is ±0.5 mm. Therefore, the total length error of the fastening tape 13 along the arrangement direction of the battery cells 11 is Therefore, when the length of the fastening belt 13 along the arrangement direction of the battery cells 11 is too small, the maximum total length error of the battery module 1 along the arrangement direction of the battery cells 11 is Therefore, when the length of the fastening belt 13 along the arrangement direction of the battery cells 11 is too large, the maximum total length error of the battery module 1 along the arrangement direction of the battery cells 11 is The thickness of the buffer pad 12 is a, so the total thickness of the buffer pad 12 is a*b, and the minimum compression of the buffer pad 12 is a*b / 10, and the maximum compression of the buffer pad 12 is a*b / 2. Therefore, when the length of the fastening belt 13 is too small, the maximum total length error of the battery module 1 along the arrangement direction of the battery cells 11 meets the minimum compression of the buffer pad 12. When the length of the fastening belt 13 is too long, the maximum total length error of the battery module 1 along the arrangement direction of the battery cells 11 and the minimum compression amount of the buffer pad 12 meet. At this time, the battery module 1 will not be damaged due to the fastening belt 13 being too tight around the battery cell 11 due to the excessive thickness of the buffer pad 12, and the battery module 1 will not be unable to be fastened by the fastening belt 13 due to the excessive thickness of the buffer pad 12.

[0030] Typically, the thickness tolerance c of the battery cell 11 is ±0.3 mm, and the thickness tolerance d of the buffer pad 12 is ±0.2 mm.

[0031] The fastening strap 13 can be a plastic strap or a steel strap. The plastic strap is light in weight, which can reduce the total weight of the battery module 1 and increase the energy density of the battery module 1. The steel strap is stronger, which is conducive to improving the structural strength of the battery module 1.

[0032] In one embodiment, the number of the battery cells 11 is n, which satisfies 10≤n≤40. Thus, by the formula And the formula The calculated thickness range of the buffer pad 12 is more reasonable. Therefore, the number of the battery cells 11 is usually limited to between 10 and 40.

[0033] In one embodiment, if Figure 7As shown, the cushion pad 12 includes a first strip segment 12a, a second strip segment 12b, a third strip segment 12c and a fourth strip segment 12d, and the first strip segment 12a, the third strip segment 12c, the second strip segment 12b and the fourth strip segment 12d are connected end to end in sequence and enclose a rectangular structure. With such a configuration, the structure of the cushion pad 12 is simpler, which is conducive to the processing and manufacturing of the cushion pad 12. However, it is not limited to this. In the actual processing process, the cushion pad 12 can also be processed and formed by an integral molding method, removing part of the structure in the middle area of ​​the cushion pad 12. At this time, the part of the structure outside the middle area of ​​the cushion pad 12 is an integral molding structure. In this way, it is conducive to improving the structural strength of the cushion pad 12.

[0034] In one embodiment, if Figure 4 , Figure 6 and Figure 7 As shown, the first segment 12a and the second segment 12b are attached to the edge area of ​​the battery cell 11 along the width direction of the battery cell 11, and the third segment 12c and the fourth segment 12d are attached to the edge area of ​​the battery cell 11 along the height direction of the battery cell 11. The buffer pad 12 is arranged at the edge area of ​​the battery cell 11, so that the extrusion force between adjacent battery cells 11 is dispersed in the edge area of ​​the battery cell 11. Generally, the edge area of ​​the battery cell 11 has a greater hardness and is not easily deformed. This is conducive to avoiding the extrusion force from being concentrated in the middle area of ​​the battery cell 11, causing damage to the internal structure of the battery cell 11. In addition, such an arrangement expands the total coverage area of ​​the buffer pad 12 and the battery cell 11, which is conducive to improving the structural strength of the battery module 1.

[0035] Specifically, the first segment 12a and the second segment 12b extend along the width direction of the battery cell 11 to the outermost end of the battery cell 11 respectively, the third segment 12c extends along the height direction of the battery cell 11 and abuts against the first segment 12a and the second segment 12b, and the fourth segment 12d extends along the height direction of the battery cell 11 and abuts against the first segment 12a and the second segment 12b.

[0036] In one embodiment, if Figure 4 , Figure 6 and Figure 7 As shown, a filling groove 14 is formed between the first segment 12a, the second segment 12b, the third segment 12c, the fourth segment 12d and two adjacent battery cells 11, and an adhesive is provided in the filling groove 14, and the adhesive connects the adjacent battery cells 11. In this way, the adhesive is filled in the filling groove 14, and the filling groove 14 formed by the buffer pad 12 and the adjacent battery cells 11 is a closed structure, which is conducive to preventing the adhesive from overflowing the filling groove 14 and causing the failure of the battery module 1. Usually, the adhesive is an acrylic adhesive. Acrylic adhesive is easy to use and can be directly applied to the filling groove 14. Acrylic adhesive has strong impact resistance and can effectively prevent the adjacent battery cells 11 from being displaced after being impacted by external forces.

[0037] In one embodiment, the area covered by the adhesive on the filling slot 14 is S, and the bottom area of ​​the filling slot 14 is Q, satisfying S≥0.3*Q. It should be noted that the area covered by the adhesive on the filling slot 14 refers to the area covered by the adhesive on the filling slot 14 after the buffer pad 12 is compressed and the adhesive is finally cured and fixed. The area covered by the adhesive on the filling slot 14 exceeds 30% of the bottom area of ​​the filling slot 14, which is conducive to increasing the contact area between the adhesive and the adjacent battery cell 11 and improving the structural strength of the battery module 1.

[0038] Furthermore, 0.4*Q≤S≤0.6*Q. In this way, the amount of adhesive applied to the filling slot 14 can be controlled more accurately to avoid insufficient adhesive affecting the connection strength of the battery cell 11 and excessive adhesive causing the adhesive to overflow from the filling slot 14 and affect the use of the battery module 1.

[0039] In one embodiment, the buffer pad 12 is adhered to the battery cell 11. In this way, the connection between the buffer pad 12 and the battery cell 11 is simpler and more efficient.

[0040] like Figure 1 As shown, the present invention further provides a battery pack 100, comprising the battery module 1 described in any one of the above embodiments.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells (11), wherein the plurality of battery cells (11) are arranged in parallel along a thickness direction; A plurality of buffer pads (12), wherein the plurality of buffer pads (12) are arranged on one side or both sides of the battery core (11) along the arrangement direction of the battery core (11); and A fastening belt (13) is clamped around the outer periphery of the battery core (11) and the buffer pad (12); The thickness of the buffer pad (12) is a, the number of the buffer pads (12) is b, the number of the battery cells (11) is n, the thickness tolerance of the battery cells (11) is c, and the thickness tolerance of the buffer pad (12) is d, satisfying: and All units are millimeters.

2. The battery module according to claim 1, characterized in that: The buffer pad (12) comprises a first segment (12a), a second segment (12b), a third segment (12c) and a fourth segment (12d); the first segment (12a), the third segment (12c), the second segment (12b) and the fourth segment (12d) are connected end to end in sequence to form a rectangular structure.

3. The battery module according to claim 2, characterized in that: The first segment (12a) and the second segment (12b) are attached to the edge region of the battery cell (11) along the width direction of the battery cell (11), and the third segment (12c) and the fourth segment (12d) are attached to the edge region of the battery cell (11) along the height direction of the battery cell (11).

4. The battery module according to claim 2, characterized in that: A filling groove (14) is formed between the first segment (12a), the second segment (12b), the third segment (12c), the fourth segment (12d) and two adjacent battery cells (11), and an adhesive is provided in the filling groove (14), and the adhesive connects adjacent battery cells (11).

5. The battery module according to claim 4, characterized in that: The area covered by the adhesive on the filling groove (14) is S, and the bottom area of ​​the filling groove (14) is Q, satisfying S≥0.3*Q.

6. The battery module according to claim 5, characterized in that: 0.4*Q≤S≤0.6*Q.

7. The battery module according to claim 1, characterized in that: The buffer pad (12) is adhered to the battery core (11).

8. The battery module according to claim 1, characterized in that: 10≤n≤40。 9. The battery module according to claim 1, characterized in that: c is ±0.3mm and d is ±0.2mm.

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

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