Battery pack and battery pack

Abstract

This utility model belongs to the field of battery manufacturing technology and discloses a battery pack and battery assembly. The battery pack includes a plurality of battery cells arranged sequentially. Each battery cell has a first surface and a second surface facing each other. At least one of the first and second surfaces is provided with a first adhesive tape and a second adhesive tape. Adjacent battery cells are connected by the first and second adhesive tapes. The first and second surfaces have a first edge and a second edge facing each other along the arrangement direction of the first and second adhesive tapes. The distance between the first and second adhesive tapes is d mm, and the distance between the first and second edges is D mm, where 0.3 ≤ d / D ≤ 0.9. This utility model ensures stable connection between battery cells and further reduces the possibility of thermal runaway.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to battery packs and battery stacks. Background Technology

[0002] Lithium-ion batteries charge and discharge by moving lithium ions between the negative and positive electrodes, exhibiting high energy density and high output power. Therefore, lithium-ion rechargeable batteries have been widely used in various fields in recent years.

[0003] Existing battery packs are formed by connecting individual battery cells sequentially. However, after connecting them into a pack, it is difficult to balance the stability of the connection with reducing the possibility of thermal runaway.

[0004] Currently, there is an urgent need for a battery pack that can ensure stable connection between individual battery cells while reducing the probability of thermal runaway. Utility Model Content

[0005] The purpose of this invention is to provide a battery pack and battery module that, after ensuring a stable connection between individual battery cells, can further reduce the possibility of thermal runaway.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The first aspect of this application relates to a battery pack comprising a plurality of battery cells arranged in sequence, each battery cell having a first surface and a second surface opposite to each other, at least one of the first surface and the second surface being provided with a first adhesive tape and a second adhesive tape, and two adjacent battery cells being connected by the first adhesive tape and the second adhesive tape; the first surface and the second surface having a first edge and a second edge opposite to each other along the arrangement direction of the first adhesive tape and the second adhesive tape;

[0008] Wherein, the spacing between the first tape and the second tape is d mm, the distance between the first edge and the second edge is D mm, and 0.3≤d / D≤0.9.

[0009] A second aspect of this application relates to a battery pack comprising a housing and the aforementioned battery packs, wherein a plurality of the battery packs are fixed within the housing.

[0010] Beneficial effects:

[0011] In the first aspect of this application, in the actual bonding process, on the one hand, the d / D value cannot be too large. If it is too large, the placement space between the first and second adhesive tapes will be too small. This results in the first and second adhesive tapes, of the same size, being closer to the edges, thus worsening the bonding effect and affecting the firmness of the connection between adjacent battery cells. This makes them more susceptible to displacement due to vibration and impact, affecting the performance of the entire battery pack. On the other hand, the d / D value cannot be too small. If it is too small, the area between the first and second adhesive tapes to accommodate deformation will be too small after the battery cells expand when energized, reducing the expansion space of the battery cells. Furthermore, the higher bonding strength further restricts the expansion of the battery cells, increasing the risk of thermal runaway. Therefore, by limiting d / D to 0.3 ≤ d / D ≤ 0.9 to constrain the position of the first and second adhesive tapes, a stable connection between battery cells can be ensured while reducing the possibility of thermal runaway.

[0012] In the second aspect of this application, the battery pack based on this battery pack can effectively improve the connection strength of the individual battery cells in the battery pack and ensure connection stability; at the same time, it can further reduce the risk of thermal runaway of the entire battery pack and improve safety. Attached Figure Description

[0013] Figure 1 This is a first layout diagram of the first and second adhesive tapes provided in this embodiment of the present invention in a single battery cell;

[0014] Figure 2 This is a second layout diagram of the first and second adhesive tapes provided in this embodiment of the present invention in a single battery cell;

[0015] Figure 3 This is a side view of a portion of the battery pack provided in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the first and second adhesive tapes provided in this embodiment of the present invention at the first dimension of a battery cell;

[0017] Figure 5 This is a schematic diagram of the first and second adhesive tapes provided in this embodiment of the present invention in the second dimension of a battery cell;

[0018] Figure 6 This is a schematic diagram of the first and second adhesive tapes provided in this embodiment of the present invention in the third dimension of a battery cell;

[0019] Figure 7 This is a schematic diagram of the ring-shaped adhesive tape provided in this embodiment of the utility model;

[0020] Figure 8This is a schematic diagram of the structure of the tape provided in this embodiment of the utility model, which has a 45° seam and is circular.

[0021] In the picture:

[0022] 1. Battery cell; 11. First surface; 110. First long side; 111. First edge; 112. Second edge; 12. Second surface; 120. First short side;

[0023] 21. First tape; 211. Edge of the first tape body; 212. Edge of the second tape body; 213. Notch; 22. Second tape; 23. Third tape; 231. Extension; 24. Fourth tape. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0028] Please see the appendix Figure 1 -Appendix Figure 3 The first aspect of this embodiment relates to a battery pack, which includes a plurality of battery cells 1 arranged in sequence. Each battery cell 1 has a first surface 11 and a second surface 12 facing each other. At least one of the first surface 11 and the second surface 12 is provided with a first adhesive tape 21 and a second adhesive tape 22. Two adjacent battery cells 1 are connected by the first adhesive tape 21 and the second adhesive tape 22. The first surface 11 and the second surface 12 have a first edge 111 and a second edge 112 facing each other along the arrangement direction of the first adhesive tape 21 and the second adhesive tape 22. The distance between the first adhesive tape 21 and the second adhesive tape 22 is d mm, and the distance between the first edge 111 and the second edge 112 is D mm, wherein 0.3 ≤ d / D ≤ 0.9.

[0029] Specifically, each battery cell 1 has a cuboid structure, and a battery pack is formed by connecting multiple battery cells 1 arranged sequentially. Each battery cell 1 has two opposing large surfaces, a first surface 11 and a second surface 12. Battery cells 1 are connected to each other using a first adhesive tape 21 and a second adhesive tape 22. The first adhesive tape 21 and the second adhesive tape 22 can be double-sided adhesive to bond adjacent battery cells 1 sequentially. The first adhesive tape 21 and the second adhesive tape 22 are spaced a certain distance apart, specifically dmm. Simultaneously, the distance between the first edge 111 and the second edge 112 of each battery cell 1 along the arrangement direction of the first adhesive tape 21 and the second adhesive tape 22 is Dmm.

[0030] In fact, using the first adhesive tape 21 and the second adhesive tape 22 to fix the battery cells 1 into groups has multiple benefits. First, the adhesive fixation ensures the stability of the battery cells 1, preventing misalignment caused by vibration, impact, or movement, thus preventing internal short circuits or mechanical damage. During assembly, the double-sided adhesive, in conjunction with a pressure mechanism, ensures the battery cells 1 are tightly bonded, ensuring neat arrangement and improving the overall structural rigidity. Furthermore, the battery undergoes slight expansion or contraction during charging and discharging; the elasticity of the double-sided adhesive absorbs these deformations, maintaining long-term stability. Some double-sided adhesives also have vibration absorption, noise isolation, and flame-retardant effects. Moreover, the double-sided adhesive bonding process is simple and easy to operate, suitable for automated production lines, and can significantly improve assembly efficiency. Compared to welding or mechanical fixing methods, double-sided adhesive reduces the use of structural components, lowers manufacturing costs, facilitates later maintenance or battery replacement, and also improves space utilization.

[0031] In the actual bonding process, on the one hand, the d / D value cannot be too large. If it is too large, the available space for the first adhesive tape 21 and the second adhesive tape 22 will be too small. This will result in the first adhesive tape 21 and the second adhesive tape 22, which are of the same size, being closer to the edge, thus worsening the bonding effect and affecting the firmness of the connection between adjacent battery cells 1. This makes them more susceptible to displacement due to other vibration and impact factors, affecting the performance of the entire battery pack. On the other hand, the d / D value cannot be too small. If it is too small, the area between the first adhesive tape 21 and the second adhesive tape 22 will be too small after the battery cell 1 expands when energized, reducing the expansion space of the battery cell 1. At the same time, the greater bonding strength will further restrict the expansion of the battery cell 1, increasing the risk of thermal runaway of the battery cell 1.

[0032] In this embodiment, as Figure 1 As shown, 80mm≤dmm≤400mm, 100mm≤Dmm≤450mm; Figure 2 As shown, 50mm≤dmm≤150mm, 80mm≤Dmm≤160mm. By limiting 0.3≤d / D≤0.9, the positions of the first tape 21 and the second tape 22 on the large surface are constrained, so that d / D is within an appropriate range. This ensures the stability of the battery cells 1 connected into a group, and further reduces the possibility of thermal runaway in the battery pack, thereby improving the overall safety of the battery pack and battery group.

[0033] It should be noted that in this embodiment, d / D is limited to a preset range, satisfying 0.3 ≤ d / D ≤ 0.9, wherein, refer to Appendix Figure 1dmm is limited to the range of 80mm to 400mm, and Dmm is limited to the range of 100mm to 450mm. The value of dmm can be 80mm, 100mm, 115mm, 120mm, 125mm, 200mm, 250mm, 300mm, or 400mm, and can be any value between 80mm and 400mm. Similarly, the value of Dmm can be 100mm, 125mm, 150mm, 160mm, 180mm, 200mm, 300mm, 350mm, or 400mm, and can be any value between 100mm and 450mm. (See attached diagram.) Figure 2 dmm is limited to the range of 50mm to 150mm, and Dmm is limited to the range of 80mm to 160mm. The value of dmm can be 50mm, 55mm, 70mm, 80mm, 100mm, 125mm, or 150mm, and can be any value between 50mm and 150mm. Similarly, the value of Dmm can be 80mm, 90mm, 100mm, 125mm, 130mm, 140mm, 150mm, 155mm, or 160mm, and can be any value between 80mm and 160mm. By limiting 0.3 ≤ d / D ≤ 0.9 and selecting appropriate values, the bonding strength requirements of various types and specifications of battery cells 1 can be met, while also reducing the possibility of thermal runaway.

[0034] Please refer to the appendix for further details. Figure 1 The first surface 11 and the second surface 12 each have two opposing and longer first long sides 110 and two opposing and shorter first short sides 120, and the first tape 21 and the second tape 22 are arranged along the extending direction of the first long side 110. At this time, the two first short sides 120 serve as the first edge 111 and the second edge 112, respectively.

[0035] Specifically, in one embodiment of this invention, the first adhesive tape 21 and the second adhesive tape 22 are arranged along the extending direction of the first long side 110. In this arrangement, the lengths of the first adhesive tape 21 and the second adhesive tape 22 are appropriately reduced, but the distance between the first adhesive tape 21 and the second adhesive tape 22 can be appropriately increased. While ensuring sufficient adhesive strength between the first adhesive tape 21 and the second adhesive tape 22, the first adhesive tape 21 and the second adhesive tape 22 can provide a larger expansion space for the battery cell 1, thereby effectively reducing the possibility of thermal runaway of the battery pack.

[0036] Please see the appendix Figure 4Optionally, the first tape 21 and the second tape 22 each have two opposing first tape edges 211 and two opposing second tape edges 212, the first tape edges 211 extending along the first long side 110 and the second tape edges 212 extending along the first short side 120.

[0037] In this embodiment, the area of ​​the first adhesive tape 21 and the area of ​​the second adhesive tape 22 can be exactly equal, thereby ensuring the consistency of the bonding process. Of course, the areas of the first adhesive tape 21 and the second adhesive tape 22 can also not be exactly equal, allowing for matching adjustments to the areas of the first adhesive tape 21 and the second adhesive tape 22 to adapt to actual process requirements. This embodiment does not specifically limit the specific area values.

[0038] In this embodiment, both the first tape 21 and the second tape 22 are rectangular strips, including two relatively short first tape edges 211 and two relatively long second tape edges 212. The first tape edges 211 are parallel to the first long side 110, and the second tape edges 212 are parallel to the first short side 120.

[0039] Furthermore, the distance between the first edge 211 of the first belt and the adjacent first long side 110 is d1mm, and the length of the first short side 120 is D1mm, where 0.01≤d1 / D1≤0.1.

[0040] Specifically, d1 represents the distance relationship between the short sides of the first adhesive tape 21 and the second adhesive tape 22 and the battery cell 1. In this embodiment, d1 / D1 is limited to a preset range, satisfying 0.01≤d1 / D1≤0.1, where d1mm is limited to 2mm~15mm, and the value of d1mm can be 2mm, 3mm, 4mm, 4.5mm, 4.7mm, 5mm, 8mm, 10mm, 11.5mm, 14mm or 15mm. The value can be one of the aforementioned values ​​or any value between 2mm and 15mm. Of course, D1mm is limited to 80mm~160mm, and the value of D1mm can be 80mm, 90mm, 100mm, 125mm, 130mm, 140mm, 150mm, 155mm or 160mm. The value can be one of the aforementioned values ​​or any value between 80mm and 160mm. By limiting d1 / D1 to an appropriate range, i.e., 0.01 ≤ d1 / D1 ≤ 0.1, the stability of the connection and the possibility of thermal runaway of the battery pack are balanced. d1 / D1 cannot be too large, because an excessively large d1 / D1 would result in an excessively large distance between the short sides of the first adhesive tape 21 and the second adhesive tape 22 and the battery cell 1, thus shortening the length of the first adhesive tape 21 and the second adhesive tape 22 within the limited D1mm, which is detrimental to the adhesive strength. d1 / D1 also cannot be too small, as an excessively small d1 / D1 would increase the adhesive area, easily leading to material waste and increasing the restriction on deformation of the first surface 11 or the second surface 12 on the battery cell 1, thereby increasing the probability of thermal runaway of the battery pack.

[0041] Optionally, the distance between the edge 212 of the second strip and the adjacent first short side 120 is d2mm, and the length of the first long side 110 is D2mm, where 0.01≤d2 / D2≤0.15.

[0042] Similarly, based on stable adhesive strength, the widths of the first tape 21 and the second tape 22 are essentially the same. Typically, 1mm ≤ d2mm ≤ 15mm, and 100mm ≤ D2mm ≤ 450mm.

[0043] In this embodiment, d2 / D2 is limited to a preset range, satisfying 0.01≤d2 / D2≤0.15. This is because d2 / D2 cannot be too large, as an excessively large d2 / D2, under the limited D2mm condition, would cause the distance between the first adhesive tape 21 and the second adhesive tape 22 to be too close, increasing the deformation restriction on the first surface 11 or the second surface 12 of the battery cell 1 and increasing the probability of thermal runaway of the battery pack. Conversely, d2 / D2 cannot be too small, as an excessively small d2 / D2 would cause the distance between the first adhesive tape 21 and the second adhesive tape 22 to be too far, which is detrimental to the bonding strength. Here, d2mm is limited to 1mm to 15mm, and the value of d1mm can be 1mm, 1.5mm, 4mm, 4.5mm, 4.7mm, 5mm, 8mm, 9mm, 11.5mm, 14mm, or 15mm. The value can specifically be one of the aforementioned values ​​or any value between 1mm and 15mm. D2mm is limited to 100mm to 450mm, and the value of D2mm can be 100mm, 125mm, 130mm, 140mm, 150mm, 155mm, 160mm, 200mm, 250mm, 300mm, 400mm, or 450mm. The value can be one of the aforementioned listed values ​​or any value between 100mm and 450mm. By limiting d2 / D2 to an appropriate range, i.e., 0.01 ≤ d2 / D2 ≤ 0.15, the stability of the connection and the possibility of thermal runaway of the battery pack are considered. Furthermore, the distance between the two opposing first strip edges 211 and their respective adjacent first long sides 110 is not equal.

[0044] In this embodiment, the first adhesive tape 21 and the second adhesive tape 22 are not centrally positioned in the extension direction of the first short side 120, and can be optimized and adjusted according to the stability of the adhesion. Specifically, after the battery cells 1 are assembled at the bottom, they can also be bonded to the bottom of the casing using double-sided adhesive, because the first adhesive tape 21 and the second adhesive tape 22 can be closer to the top (terminal position) of the battery cells 1, thereby ensuring that the adhesive force in the direction of the first short side 120 of the battery pack is kept relatively uniformly distributed.

[0045] Please see the appendix Figure 5 Optionally, the first surface 11 and the second surface 12 each have two opposing and longer first long sides 110 and two opposing and shorter first short sides 120, and the first tape 21 and the second tape 22 are arranged along the extending direction of the first short sides 120. In this case, the two first long sides 110 serve as the first edge 111 and the second edge 112, respectively.

[0046] Specifically, as another implementation of this embodiment, the first tape 21 and the second tape 22 can also be arranged along the extending direction of the first short side 120, that is, the first tape 21 and the second tape 22 can extend along the direction of the first long side 110. In this arrangement, the first tape 21 and the second tape 22 can be appropriately lengthened, while the width dimension is adaptively reduced.

[0047] Specifically, the first tape 21 and the second tape 22 each have two opposing first tape edges 211 and two opposing second tape edges 212. The first tape edges 211 extend along the first short side 120, and the second tape edges 212 extend along the first long side 110.

[0048] Based on the above arrangement, the shorter edge 211 of the first belt is parallel to the first short side 120, and the longer edge 212 of the second belt is parallel to the first long side 110.

[0049] Optionally, the distance between the first edge 211 of the first belt and the adjacent first short side 120 is d3mm, and the length of the first long side 110 is D2mm, wherein 0.01≤d3 / D2≤0.15.

[0050] In this embodiment, d3 / D2 is limited to a preset range, satisfying 0.01≤d3 / D2≤0.15. This is because d3 / D2 cannot be too large, as an excessively large d3 / D2 would result in an excessively large distance between the short sides of the first adhesive tape 21 and the second adhesive tape 22 and the battery cell 1. Consequently, within the limited D2mm, the lengths of the first adhesive tape 21 and the second adhesive tape 22 would be shortened, which is detrimental to the bonding strength. Conversely, d3 / D2 cannot be too small, as an excessively small d3 / D2 would increase the bonding area, easily leading to material waste and increasing the restriction on deformation of the first surface 11 or the second surface 12 on the battery cell 1, thus increasing the probability of thermal runaway of the battery pack. Specifically, d3mm is limited to 1mm to 15mm, and the value of d3mm can be 1mm, 1.5mm, 4mm, 4.5mm, 4.7mm, 5mm, 8mm, 9mm, 11.5mm, 14mm, or 15mm. The value can be one of the aforementioned listed values ​​or any value between 1mm and 15mm. By limiting d3 / D2 to an appropriate range, i.e., 0.01 ≤ d3 / D2 ≤ 0.15, the stability of the connection and the possibility of thermal runaway of the battery pack are considered.

[0051] Optionally, the distance between the second edge 212 and the adjacent first long side 110 is d4mm, typically 2mm≤d4mm≤15mm, and the length of the first short side 120 is D1mm, typically 80mm≤D1mm≤160mm, where 0.01≤d4 / D1≤0.1.

[0052] In this embodiment, d4 / D1 cannot be too large, because an excessively large d4 / D1, under the limited D1mm condition, would make the distance between the first adhesive tape 21 and the second adhesive tape 22 too close, increasing the deformation restriction on the first surface 11 or the second surface 12 on the battery cell 1 and increasing the probability of thermal runaway of the battery pack. d4 / D1 also cannot be too small, because an excessively small d4 / D1 would make the distance between the first adhesive tape 21 and the second adhesive tape 22 too far, affecting the bonding strength. d4 / D1 is limited to a preset range, satisfying 0.01≤d4 / D1≤0.1, where d4mm is limited to 2mm~15mm, and the value of d4mm can be 2mm, 4mm, 4.5mm, 4.7mm, 5mm, 8mm, 9mm, 11.5mm, 14mm, or 15mm. The value can specifically be one of the aforementioned values, or any value between 2mm and 15mm. By limiting d4 / D1 to an appropriate range, i.e. 0.01≤d4 / D1≤0.1, the stability of the connection and the possibility of thermal runaway of the battery pack are taken into account.

[0053] Optionally, the distance between the two first strip edges 211 and the adjacent first short side 120 is not equal.

[0054] In this embodiment, the first tape 21 and the second tape 22 can be set in a non-centered manner in the extension direction of the first long side 110, and the specific arrangement can be optimized and adjusted according to the stability of the bonding.

[0055] Optionally, the two first adhesive tapes 21 of two adjacent battery cells 1 are arranged opposite each other, and / or the two second adhesive tapes 22 of two adjacent battery cells 1 are arranged opposite each other.

[0056] In one implementation of this embodiment, for two adjacent battery cells 1, the first adhesive tape 21 and the second adhesive tape 22 are both disposed on the first surface 11. The two opposing first adhesive tapes 21 of the two adjacent battery cells 1 are disposed facing each other, and the two opposing second adhesive tapes 22 are also disposed facing each other, thereby ensuring the consistency of the bonding process and ensuring that the adhesive force forms a regular distribution in the arrangement direction of the battery cells 1 of the entire battery pack, thus ensuring the consistency of the adhesive force distribution.

[0057] Optionally, the two first adhesive strips 21 of two adjacent battery cells 1 are staggered in the extension direction of the first long side 110, and / or staggered in the extension direction of the first short side 120. The two second adhesive strips 22 of two adjacent battery cells 1 are staggered in the extension direction of the first long side 110, and / or staggered in the extension direction of the first short side 120.

[0058] In another implementation of this embodiment, the first adhesive tape 21 and the second adhesive tape 22 on two adjacent battery cells 1 are both disposed on the first surface 11, with the two opposing first adhesive tapes 21 and the two opposing second adhesive tapes 22 being staggered. Specifically, they can be staggered in the extension direction of the first long side 110 or in the extension direction of the first short side 120.

[0059] In fact, the misalignment setting can be adaptively adjusted according to the specific position of the battery cell 1 in the battery pack. The misalignment setting is not the same as the random setting. Therefore, it is necessary to take into account the bonding strength and the possibility of thermal runaway to reasonably adjust the misalignment distance. This embodiment does not limit the specific misalignment distance.

[0060] Please see the appendix Figure 6 Optionally, the battery pack further includes a third tape 23 extending along the arrangement direction of the first tape 21 and the second tape 22, wherein the third tape 23 is at least partially located in the region between the first tape 21 and the second tape 22.

[0061] In this embodiment, the addition of a third adhesive tape 23 further increases the bonding strength, thereby improving the battery pack's vibration and shock resistance, enabling it to adapt to high-impact and high-vibration environments. Simultaneously, the third adhesive tape 23 is positioned between the first adhesive tape 21 and the second adhesive tape 22, avoiding the central area between them. This prevents the increased bonding force from restricting the normal expansion of the individual battery cells 1. Although the placement of the third adhesive tape 23 affects the probability of thermal runaway, this effect can be mitigated by appropriately positioning it.

[0062] Furthermore, a notch 213 is formed on the side of the first tape 21 and the second tape 22 near the third tape 23, and the third tape 23 extends at least partially into the notch 213.

[0063] Typically, the width of the third adhesive tape 23 is roughly equivalent to that of the first adhesive tape 21 and the second adhesive tape 22. When the distance between the first and second adhesive tapes 21 and the edge of the battery cell 1 is close, the space for the third adhesive tape 23 may be compressed. Therefore, to avoid affecting the bonding strength by adaptively reducing the width of the third adhesive tape 23, in this embodiment, a notch 213 is formed on the side of the first and second adhesive tapes 21 and the side closest to the third adhesive tape 23. The notch 213 can avoid the two ends of the third adhesive tape 23. This avoids the width of the third adhesive tape 23 being affected by the bonding area planning.

[0064] Furthermore, at least part of the end of the third tape 23 is used to form an extension 231 that matches the shape of the notch 213, the extension 231 being placed in the notch 213.

[0065] In this embodiment, at least a portion of the end of the third adhesive tape 23 is used to form an extension 231 that matches the shape of the notch 213. The end of the third adhesive tape 23 is provided with an extension 231 that can extend into the notch 213. The extension 231 compensates for the lack of adhesive at the notch 213, ensuring adhesive strength. Specifically, the notch 213 is an L-shaped right-angled structure, and the extension 231 is also adaptively a right-angled protruding structure that extends into the notch 213.

[0066] Optionally, within the notch 213, the minimum distance between the extension 231 and the side of the notch 213 is d5mm, where 0.2mm≤d5mm≤5mm.

[0067] In this embodiment, a gap is formed between the extension 231 and the side of the notch 213, and the minimum gap value is d5mm. d5mm should be limited to a suitable range. In this embodiment, 0.2mm ≤ d5mm ≤ 5mm, meaning that d5mm can be 0.2mm, 0.4mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm. The value can be one of the aforementioned values ​​or any value between 0.2mm and 5mm. d5mm should not be too large, as an excessively large gap value may weaken the bonding strength, affecting adhesion and reliability; d5mm should also not be too small, as an excessively small gap value may restrict the normal expansion of the battery cell 1 at the gap, affecting safety.

[0068] Optionally, the battery pack further includes a fourth adhesive tape 24, which is spaced apart from the third adhesive tape 23 and extends in the same direction. The fourth adhesive tape 24 is at least partially located in the region between the first adhesive tape 21 and the second adhesive tape 22. Figure 7 As shown, the first adhesive tape 21, the second adhesive tape 22, the third adhesive tape 23, and the fourth adhesive tape 24 can be arranged to form a ring, further increasing the bonding strength while ensuring an effective area to accommodate deformation. In this embodiment, to further improve the battery pack's vibration and impact resistance, enabling it to adapt to high-impact and high-vibration environments, the fourth adhesive tape 24 is added to the third adhesive tape 23 to further increase the bonding strength. The fourth adhesive tape 24 can be positioned opposite to the third adhesive tape 23, thereby forming a circumferential bond in four areas. The structure and arrangement of the fourth adhesive tape 24 can be referenced to the third adhesive tape 23, forming a symmetrical layout with it.

[0069] Please see the appendix Figure 8In another embodiment, the notch 213 can be further eliminated, and the ends of the first tape 21, the second tape 22, the third tape 23 and the fourth tape 24 are inclined at 45°, so that the ends of the first tape 21, the second tape 22, the third tape 23 and the fourth tape 24 sequentially form a 45° seam. The appropriate seam gap can not only ensure the bonding strength, but also reduce the restriction on the normal expansion of the battery cell 1, and also reduce the process difficulty.

[0070] In another embodiment, the third tape 23 and the fourth tape 24 may be located entirely within the area between the first tape 21 and the second tape 22. In this case, the first tape 21, the second tape 22, the third tape 23, and the fourth tape 24 are all strip-shaped, eliminating the need for notches 213 or 45° cuts, resulting in a simpler structure and easier processing.

[0071] Optionally, before the battery cells 1 are connected, the coating thickness of the first tape 21 and the second tape 22 is H1mm, and after the battery cells 1 are connected, the gap between two adjacent battery cells 1 is Hmm, where 1.1≤H1 / H≤2.

[0072] Generally, the greater the thickness of the first adhesive tape 21 and the second adhesive tape 22, the stronger the bond strength. This is because a thicker adhesive layer provides a larger contact area and stronger intermolecular forces, thus enhancing the adhesion. For special types of double-sided adhesives, a greater coating thickness can also bring positive effects. For example, the greater the thickness of thermally conductive double-sided adhesive, the better its thermal conductivity. This is because a thicker adhesive layer can accommodate more thermally conductive fillers, thereby forming a more efficient heat conduction path.

[0073] The coating thickness of the first adhesive tape 21 and the second adhesive tape 22 cannot be too large. Firstly, with a design gap Hmm between the two battery cells 1 that is basically the same, a larger coating thickness will result in greater compressive force on the two battery cells 1 after assembly. This not only affects the reduction of the battery pack thickness but may also affect the normal expansion of the battery cells 1 at that gap, thus negatively impacting the likelihood of thermal runaway. Secondly, excessively thick layers of the first adhesive tape 21 and the second adhesive tape 22 may lead to the formation of bubbles and defects. These defects will become stress concentration points, thus reducing the adhesive strength. A thick adhesive layer will also generate significant thermal expansion upon heating, creating greater thermal stress in the interface area, which makes the connection more susceptible to failure. An excessively thick adhesive layer may increase thermal resistance, affecting heat dissipation efficiency. During the curing process, a thick adhesive layer may generate greater internal stress, leading to delamination between the adhesive layer and the battery cell 1. However, Hmm cannot be too small either, as this will reduce the adhesive strength or even cause adhesive failure. Therefore, in this embodiment, the coating thickness of the first adhesive tape 21 and the second adhesive tape 22 is H1mm. Typically, 0.3mm ≤ H1mm ≤ 11.5mm, meaning the value of H1mm can be 0.3mm, 0.4mm, 2mm, 5mm, 6mm, 6.5mm, 8mm, 9mm, 10mm, or 11.5mm. The value can be any value between 0.3mm and 11.5mm, specifically those listed above. Similarly, 0.2mm ≤ Hmm ≤ 8mm, meaning the value of Hmm can be any value between 0.2mm, 0.4mm, 2mm, 5mm, 6mm, 6.5mm, or 8mm. By limiting 1.1 ≤ H1 / H ≤ 2, the connection strength requirement is met, and the drawbacks caused by increased coating thickness are further avoided.

[0074] The second aspect of this embodiment also relates to a battery pack, which includes a housing and a plurality of battery packs, wherein a plurality of battery packs are fixed within the housing.

[0075] Specifically, the bottom of the battery pack can be fixed to the bottom of the casing using structural adhesive.

[0076] In this embodiment, the battery pack based on this battery pack can effectively improve the connection strength of the individual battery cells 1 in the battery pack and ensure connection stability; at the same time, it can further reduce the risk of thermal runaway of the entire battery pack and improve safety.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, The device includes a plurality of battery cells (1) arranged in sequence. Each battery cell (1) has a first surface (11) and a second surface (12) facing each other. At least one of the first surface (11) and the second surface (12) is provided with a first tape (21) and a second tape (22). Two adjacent battery cells (1) are connected by the first tape (21) and the second tape (22). The first surface (11) and the second surface (12) have a first edge (111) and a second edge (112) facing each other along the arrangement direction of the first tape (21) and the second tape (22). Wherein, the distance between the first tape (21) and the second tape (22) is d mm, the distance between the first edge (111) and the second edge (112) is D mm, and 0.3≤d / D≤0.

9.

2. The battery pack according to claim 1, characterized in that, The first surface (11) and the second surface (12) have two opposing and longer first long sides (110) and two opposing and shorter first short sides (120), respectively, and the first tape (21) and the second tape (22) are arranged along the extension direction of the first long side (110).

3. The battery pack according to claim 2, characterized in that, The first tape (21) and the second tape (22) each have two opposing first tape edges (211) and two opposing second tape edges (212), the first tape edges (211) extending along the first long side (110) and the second tape edges (212) extending along the first short side (120).

4. The battery pack according to claim 3, characterized in that, The distance between the first edge (211) of the first strip and the adjacent first long side (110) is d1mm, and the length of the first short side (120) is D1mm, wherein 0.01≤d1 / D1≤0.

1.

5. The battery pack according to claim 3, characterized in that, The distance between the edge (212) of the second strip and the adjacent first short side (120) is d2mm, and the length of the first long side (110) is D2mm, wherein 0.01≤d2 / D2≤0.

15.

6. The battery pack according to claim 3, characterized in that, The distances between the two opposing edges (211) of the first strip and their respective adjacent first long sides (110) are not equal.

7. The battery pack according to claim 1, characterized in that, The first surface (11) and the second surface (12) have two opposing and longer first long sides (110) and two opposing and shorter first short sides (120), respectively, and the first tape (21) and the second tape (22) are arranged along the extension direction of the first short side (120).

8. The battery pack according to claim 7, characterized in that, The first tape (21) and the second tape (22) each have two opposing first tape edges (211) and two opposing second tape edges (212), the first tape edges (211) extending along the first short side (120) and the second tape edges (212) extending along the first long side (110).

9. The battery pack according to claim 8, characterized in that, The distance between the first edge (211) of the first strip and the adjacent first short side (120) is d3mm, and the length of the first long side (110) is D2mm, wherein 0.01≤d3 / D2≤0.

15.

10. The battery pack according to claim 8, characterized in that, The distance between the edge (212) of the second strip and the adjacent first long side (110) is d4mm, and the length of the first short side (120) is D1mm, wherein 0.01≤d4 / D1≤0.

1.

11. The battery pack according to claim 8, characterized in that, The distances between the two first strip edges (211) and the adjacent first short side (120) are not equal.

12. The battery pack according to claim 1, characterized in that, 50mm≤dmm≤400mm.

13. The battery pack according to claim 1, characterized in that, The area of ​​the first tape (21) is not equal to the area of ​​the second tape (22).

14. The battery pack according to claim 1, characterized in that, Two adjacent battery cells (1) are arranged opposite to each other by the two first adhesive tapes (21), and / or, The two second tapes (22) of two adjacent battery cells (1) are arranged opposite each other.

15. The battery pack according to claim 2, characterized in that, The two adjacent battery cells (1) and the two first adhesive tapes (21) are staggered in the extension direction of the first long side (110), and / or, It is offset in the extension direction of the first short side (120).

16. The battery pack according to claim 2, characterized in that, The two adjacent battery cells (1) and the two second adhesive tapes (22) are staggered in the extension direction of the first long side (110), and / or, It is offset in the extension direction of the first short side (120).

17. The battery pack according to claim 1, characterized in that, The first tape (21) and / or the second tape (22) are strips.

18. The battery pack according to claim 1, characterized in that, The battery pack further includes a third tape (23) extending along the arrangement direction of the first tape (21) and the second tape (22), the third tape (23) being at least partially located in the region between the first tape (21) and the second tape (22).

19. The battery pack according to claim 18, characterized in that, The first tape (21) and the second tape (22) have a notch (213) on the side near the third tape (23), and the third tape (23) extends at least partially into the notch (213).

20. The battery pack according to claim 19, characterized in that, The end of the third tape (23) is at least partially used to form an extension (231) that matches the shape of the notch (213), the extension (231) being placed in the notch (213).

21. The battery pack according to claim 20, characterized in that, Within the notch (213), the minimum distance between the extension (231) and the side of the notch (213) is d5mm, where 0.2mm≤d5≤5mm.

22. The battery pack according to claim 20, characterized in that, The notch (213) is L-shaped.

23. The battery pack according to claim 18, characterized in that, The battery pack also includes a fourth tape (24), which is spaced apart from the third tape (23) and extends in the same direction. The fourth tape (24) is at least partially located in the area between the first tape (21) and the second tape (22).

24. The battery pack according to claim 1, characterized in that, Before the battery cells (1) are connected, the coating thickness of the first tape (21) and the second tape (22) is H1mm. After the battery cells (1) are connected, the gap between two adjacent battery cells (1) is Hmm, where 1.1≤H1 / H≤2.

25. A battery pack, characterized in that, It includes a housing and a battery pack as described in any one of claims 1-24, with a plurality of the battery packs fixed inside the housing.

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