Battery pack

Abstract

The invention relates to the technical field of electric energy storage, and particularly discloses a battery pack, which comprises a battery box body, a plurality of battery compartments and a plurality of battery modules, the plurality of battery modules are arranged in one-to-one correspondence with the battery cabins, and the battery modules are positioned in the middle positions of the corresponding battery cabins; each colloid barrier strip is positioned at the edge position of each battery compartment, and a longitudinal interval space is reserved between each colloid barrier strip and the corresponding battery module; and the heat-conducting glue layer comprises a flat spreading part located at the bottom of the battery module and an overflow part located in the longitudinal interval space and connected to the edge position of the flat spreading part. According to the battery pack provided by the invention, the problems of insufficient bonding strength and cost waste caused by invalid transverse overflow of the heat-conducting glue outside the battery module can be effectively solved.

Description

Technical Field

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

[0002] During the production process of power battery modules, thermal conductive adhesive (such as polyurethane, acrylic, etc.) is usually applied to the bottom of the battery cell, and then the battery module is bonded and fixed to the box to enhance structural strength and improve heat dissipation performance.

[0003] However, existing adhesive coating processes have significant adhesive overflow control flaws. Specifically, during the battery module press process, the thermal adhesive often spreads uncontrollably laterally around the battery module, forming a large, thin layer. This overflowing peripheral layer cannot directly contact the battery module, resulting in insufficient bonding strength and ineffective improvement of the module's overall rigidity, leading to wasted thermal adhesive and increased costs.

[0004] Therefore, it is necessary to improve the existing battery pack to solve the problem of insufficient bonding strength and cost waste caused by the ineffective lateral overflow of thermal conductive adhesive outside the battery module.

[0005] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the Invention

[0006] One object of the present invention is to provide a battery pack that can effectively solve the problem of insufficient bonding strength and cost waste caused by ineffective lateral overflow of thermal conductive adhesive outside the battery module.

[0007] To achieve the above objectives, the present invention provides a battery pack comprising:

[0008] A battery box, wherein a plurality of battery compartments are provided inside the battery box;

[0009] A plurality of battery modules are provided corresponding to each of the battery compartments, wherein the battery modules are located in the middle of the corresponding battery compartments;

[0010] A plurality of colloid baffles, each of the colloid baffles being located at an edge of each of the battery compartments and having a longitudinal spacing space between the colloid baffles and the corresponding battery module;

[0011] The thermally conductive adhesive layer includes a flat portion located at the bottom of the battery module and an overflow portion located in the longitudinal spacing space and connected to an edge of the flat portion.

[0012] Optionally, also include:

[0013] A plurality of raising bars are fixed in the battery compartment and arranged corresponding to the bottom of the battery module, so that a horizontal spacing space for accommodating the flattened portion is left between the bottom surface of the battery module and the bottom of the battery compartment.

[0014] Optionally, each of the heightening strips is arranged parallel to the colloid baffle strip, and the heightening strips close to the colloid baffle strip are provided with a plurality of thinning areas;

[0015] The thinned area forms an exhaust glue outlet for air and thermal conductive glue to flow from the transverse spacing space to the longitudinal spacing space.

[0016] Optionally, the cross-sectional area of the exhaust and glue-passing port remains unchanged in a direction approaching the glue barrier strip.

[0017] Optionally, the cross-sectional area of the exhaust glue outlet gradually increases toward the direction approaching the glue barrier strip.

[0018] Optionally, the battery module includes a plurality of battery cells arranged along the length direction of the heightening strip.

[0019] The exhaust glue port is arranged opposite to the joint position between two adjacent battery cell units.

[0020] Optionally, both the overflow portion and the glue passing portion located at the exhaust glue passing port include a colloid main body arranged parallel to each of the battery cells, and a colloid branch extending from the colloid main body to between edges of two adjacent battery cells.

[0021] Optionally, the battery box includes a liquid cooling plate, a box frame fixed to an edge of the liquid cooling plate and cooperating with the liquid cooling plate to enclose a box space opening upward, and a longitudinal and transverse beam assembly located in the box space and dividing the box space into the battery compartments.

[0022] in,

[0023] The colloid baffle is adhesively fixed to the liquid cooling plate, and a side of the colloid baffle away from the battery module abuts against the box frame to limit the lateral displacement of the colloid baffle after the overflow portion solidifies.

[0024] Optionally, the battery module includes a plurality of battery cells, each of which includes a battery cell body and a protective film attached to the outside of the battery cell body by a wrapping process;

[0025] The edge seam of the protective film is located at the lower part of the side of the battery cell body close to the colloid barrier strip, so that the overflow portion at least partially covers the edge seam.

[0026] Optionally, the height of the colloid barrier strip is greater than the height of the hemming seam, so that the overflow portion completely covers the hemming seam.

[0027] The beneficial effects of the present invention are: providing a battery pack in which the colloid baffles are arranged along the edge of the battery compartment, forming a specific longitudinal spacing space between the battery module. This structure changes the flow characteristics of the colloid, so that the colloid that would originally spread out in all directions is blocked by the colloid baffles and guided to overflow upward. This directional control avoids the ineffective spreading of the colloid in areas where the battery module is not arranged, ensuring that the colloid is concentrated in the effective bonding area. The overflowing colloid forms a vertical overflow portion under the restriction of the colloid baffles, which together with the flat portion spread out at the bottom constitutes a more stable adhesive system, significantly improving the bonding strength between the battery module and the battery case.

[0028] Therefore, the battery pack provided by the present invention can effectively solve the problem of insufficient bonding strength and cost waste caused by ineffective lateral overflow of thermal conductive adhesive outside the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment;

[0031] Figure 2 A schematic cross-sectional view of a battery pack provided in an embodiment;

[0032] Figure 3 A schematic diagram of the heightening strip when the cross-sectional area of the exhaust and glue-passing ports provided in the embodiment remains unchanged;

[0033] Figure 4 A schematic diagram of the heightening strip when the exhaust glue outlet is gradually expanded in a trapezoidal shape provided in the embodiment;

[0034] Figure 5 A schematic diagram of the heightening strip when the exhaust port horn gradually expands provided in the embodiment;

[0035] Figure 6 A schematic diagram of the relative positions of the exhaust port and the battery cell provided in an embodiment;

[0036] Figure 7 A schematic structural diagram of an overflow portion provided in an embodiment;

[0037] Figure 8Schematic diagram of the edge wrapping process of the battery cell provided in the embodiment.

[0038] In the picture:

[0039] 1. Battery box; 101. Liquid cooling plate; 102. Box frame; 103. Vertical and horizontal beam assembly;

[0040] 2. Battery module; 201. Cell; 2011. Cell body; 2012. Protective film; 2013. Edge seam; 2014. First chamfer; 2015. Second chamfer; 2016. Third chamfer;

[0041] 3. Colloid barrier strip;

[0042] 4. Thermal conductive adhesive layer; 401. Flattening portion; 402. Overflow portion; 4021. Colloid trunk; 4022. Colloid branch;

[0043] 5. Heightening strip; 501. Exhaust glue port. DETAILED DESCRIPTION

[0044] Reference to "embodiments" in the present invention means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present invention, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0045] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The use of relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0046] In the description of the present invention, the term "and / or" is used to describe a logical relationship between objects, indicating that three possible relationships exist. For example, A and / or B means: A exists, B exists, and both A and B exist. Furthermore, the character " / " generally indicates that the objects are in a logical "or" relationship.

[0047] In the present invention, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0048] Without further restrictions, in the present invention, the words "include", "comprise", "have" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0049] Consistent with the understanding in the Examination Guidelines, in the present invention, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of the present invention, "multiple" means two or more (including two), and similar expressions related to "multiple," such as "multiple groups" and "multiple times," are also understood in this manner, unless otherwise specifically defined.

[0050] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention.

[0051] Unless otherwise expressly specified or limited, in the description of the embodiments of the present invention, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection between two elements or the interaction relationship between two elements. For those skilled in the art of the technology to which the present invention belongs, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0052] The present invention provides a battery pack that effectively solves the problem of lateral overflow of thermal conductive adhesive in traditional processes through the innovative design of adhesive baffles.

[0053] See also Figure 1 and Figure 2The battery pack provided in this embodiment includes a battery box 1, a plurality of battery modules 2, a plurality of colloid baffles 3, and a thermal conductive adhesive layer 4.

[0054] The battery box 1 is provided with a plurality of battery compartments; each battery module 2 is provided in a one-to-one correspondence with each battery compartment, and the battery module 2 is located in the middle of the corresponding battery compartment;

[0055] Each of the colloid baffles 3 is located at the edge of each of the battery compartments, and a longitudinal spacing space is left between the corresponding battery module 2;

[0056] See also Figure 2 The thermally conductive adhesive layer 4 includes a flat portion 401 located at the bottom of the battery module 2, and an overflow portion 402 located in the longitudinal spacing and connected to the edge of the flat portion 401. The flat portion 401 and the overflow portion 402 are formed by pressing the battery module 2 into the battery case 1. The thermally conductive adhesive can be pre-applied to the battery case 1, corresponding to the position where the battery module 2 is installed. When the battery module 2 is pressed into the battery case 1, the battery module 2 contacts the thermally conductive adhesive, and the thermally conductive adhesive diffuses to the surroundings to form the flat portion 401. The thermally conductive adhesive at the edge of the flat portion 401 corresponding to the position of the colloid barrier 3 can overflow from the side of the battery module 2 into the longitudinal spacing. Under the blocking effect of the colloid barrier 3, it flows upward to form the overflow portion 402. It should be noted that the thermal conductive adhesive flowing into the longitudinal spacing space can flow in the extension direction of the longitudinal spacing space to avoid the problem of uneven height of the overflow portion 402, improve the consistency of connection and heat exchange with the battery module 2, and avoid local stress concentration and temperature unevenness.

[0057] Specifically, the colloid barrier strips 3 are arranged along the edge of the battery compartment, forming a specific longitudinal spacing between the battery module 2. This structure changes the flow characteristics of the colloid, so that the colloid that would otherwise spread outward is blocked by the colloid barrier strips 3 and directed to overflow upward. This directional control avoids the ineffective spreading of the colloid in areas other than the battery module 2, ensuring that the colloid is concentrated in the effective bonding area. Under the restraint of the colloid barrier strips 3, the overflowing colloid forms a vertical overflow portion 402, which connects with the flattened portion 401 at the bottom to form a more stable adhesive system, significantly increasing the bonding area between the battery module 2 and the battery case 1, and thus improving the bonding strength. Because the bottom and side surfaces of the battery module 2 are bonded to the battery case 1, a "three-dimensional constraint" is formed, which significantly reduces the vibration of the battery module 2 in the lateral and longitudinal directions, disperses vibration stress, reduces the impact on the battery module 2, and forms an integrated structure between the battery module 2 and the battery case 1, improving the overall structural strength.

[0058] This structure also optimizes colloid distribution and reduces material waste. The overflow portion 402 can directly contact the side of the battery module 2, increasing the heat dissipation area and facilitating thermal management of the battery module 2. The overall design simultaneously optimizes structural strength, material utilization, and heat dissipation performance without significantly increasing costs, achieving a synergistic improvement in multiple technical effects.

[0059] Therefore, the battery pack provided by the present invention can effectively solve the problem of insufficient bonding strength and cost waste caused by ineffective lateral overflow of thermal conductive adhesive outside the battery module 2.

[0060] In this embodiment, the battery box 1 includes a liquid cooling plate 101, a box frame 102 fixed to the edge of the liquid cooling plate 101 and cooperating with the liquid cooling plate 101 to enclose a box space opening upward, and a longitudinal and transverse beam assembly 103 located in the box space and dividing the box space into the battery compartments.

[0061] in,

[0062] The colloid baffle 3 is bonded and fixed to the liquid cooling plate 101 , and the side of the colloid baffle 3 away from the battery module 2 abuts against the box frame 102 to prevent the overflow portion 402 from being solidified and causing the colloid baffle 3 to shift laterally.

[0063] The design of the colloidal baffle 3, the liquid cooling plate 101, and the chassis frame 102 prevents the colloidal baffle 3 from shifting when the overflow portion 402 solidifies, ensuring structural stability. At the same time, the fixing method of the colloidal baffle 3 simplifies the assembly process, improving production efficiency and reliability.

[0064] It should be noted that, in one embodiment, the colloid barrier strips 3 can be provided only at the edge of the battery compartment corresponding to the box frame 102 to improve space utilization and ensure battery pack capacity density. In other embodiments, the colloid barrier strips 3 can be provided at other edge positions of the battery compartment, for example, at the edge positions corresponding to the longitudinal and transverse beam assemblies 103. The colloid barrier strips 3 can be provided at multiple edge positions, or at all edge positions, as needed.

[0065] In this embodiment, the battery pack further includes a plurality of heightening bars 5. Each heightening bar 5 is fixedly mounted in the battery compartment and disposed below the battery module 2, so that a lateral spacing space for accommodating the flattened portion 401 is left between the bottom surface of the battery module 2 and the bottom of the battery compartment.

[0066] The provision of the spacer strips 5 creates a transverse spacing, allowing the flattened portion 401 of the thermally conductive adhesive to be evenly distributed across the bottom of the battery module 2, ensuring strong adhesion and effective heat dissipation. Optionally, the adhesive strips 3 and the spacer strips 5 can be made of the same material. For example, both can be made of an insulating material such as PC (polycarbonate), rigid polyurethane, foamed silicone, or MPP (modified polypropylene). The material used is not limited to any specific material, as long as it meets the insulation and voltage resistance requirements. The adhesive strips 5 can be adhered to the top surface of the liquid cooling plate 101 or the inside of the chassis frame 102 using double-sided tape, structural adhesive, or other adhesives. Using the same material as the adhesive strips 3 simplifies the production process and reduces material costs. In other embodiments, the adhesive strips 3 and the spacer strips 5 can be made of different materials. The adhesive strips 3 can be made of a cushioning material (e.g., foam) to provide a buffer between the battery module 2 and the chassis frame 102, preventing damage to the battery module 2 caused by rigid impact. Furthermore, the overflow portion 402 can squeeze the colloid barrier strip 3 to a certain extent during solidification, so as to fill the longitudinal spacing space between the battery module 2 and the box frame 102 , thereby further improving the structural strength.

[0067] It should be noted that there are at least two raising bars 5 corresponding to the lower position of each battery module 2, and the two raising bars 5 are symmetrically arranged along the length direction of the battery module 2. The thermal conductive adhesive is applied between the two raising bars, and the battery module 2 is pressed down to spread the thermal conductive adhesive flatly. In this way, the uniformity of the spread portion 401 can be improved.

[0068] Furthermore, each of the heightening strips 5 is arranged parallel to the colloid baffles 3, and the extension direction of the heightening strips 5 is parallel to the extension direction of the colloid baffles 3, so that the heightening strips 5 are arranged opposite to the colloid baffles 3. When thermal conductive adhesive is applied between the heightening strips 5 and the colloid baffles 3, the thermal conductive adhesive can form a flat portion 401 while overflowing upward to form an overflow portion 402. However, due to the small spacing between the heightening strips 5 and the colloid baffles 3, the amount of thermal conductive adhesive that can be applied is small, and the overflow portion 402 of the desired height cannot be formed.

[0069] In one embodiment, the heightening strip 5 near the colloid barrier strip 3 is provided with a plurality of thinning areas; the thinning areas form exhaust ports 501 for air and thermally conductive adhesive to flow from the transverse spacing space to the longitudinal spacing space.

[0070] During the installation of the battery module 2 into the battery compartment, the venting opening 501 formed in the thinned area effectively expels air and excess colloid from the bottom of the battery module 2, preventing poor bonding caused by bubbles. This ensures uniform distribution of the thermally conductive adhesive, improving bonding quality and heat dissipation efficiency. Furthermore, the thermally conductive adhesive on the side of the heightened strip 5 away from the colloid barrier strip 3 can flow along the venting opening 501 into the side of the heightened strip 5 closer to the colloid barrier strip 3 (i.e., overflowing onto both the heightened strip 5 and the colloid barrier strip 3), thereby achieving an overflow portion 402 of the desired height, enhancing heat exchange efficiency and structural strength.

[0071] Optional, such as Figure 3 As shown, the cross-sectional area of the exhaust port 501 remains constant toward the colloid barrier 3. The constant cross-sectional area of the exhaust port 501 stabilizes the flow of air and colloid, avoids turbulence or blockage, further optimizes exhaust and colloid flow efficiency, and improves process controllability.

[0072] Alternatively, the cross-sectional area of the exhaust and glue-passing port 501 gradually increases toward the direction close to the glue barrier 3. For example, the exhaust and glue-passing port 501 is a trapezoidal inclined surface gradually expanding structure (such as Figure 4 As shown) or the speaker arc gradually expands the structure (as shown Figure 5 The gradually expanding venting and glue-passing port 501 (e.g., a trapezoidal or trumpet-shaped port) can accelerate the flow of air and glue, reduce resistance, ensure that the glue fully fills the longitudinal spacing, and enhance the formation effect and bonding strength of the overflow portion 402.

[0073] See also Figure 6 In this embodiment, the battery module 2 includes a plurality of battery cells 201 arranged along the length direction of the heightening strip 5, and the exhaust glue port 501 is arranged opposite to the joint position between two adjacent battery cells 201. The exhaust glue port 501 is arranged opposite to the joint between two adjacent battery cells 201, so that the colloid can directly fill the joint area between the two adjacent battery cells 201, thereby enhancing the bonding strength and structural stability between the two adjacent battery cells 201, and improving the heat dissipation performance at the joint. It should be noted that the exhaust glue port 501 can have a production and manufacturing tolerance with respect to the joint between two adjacent battery cells 201, which is also included in the scope of the application.

[0074] Specifically, see Figure 7, both the overflow portion 402 and the glue portion located at the exhaust glue port 501 include a colloid main trunk 4021 arranged parallel to each of the battery cells 201, and a colloid branch 4022 extending from the colloid main trunk 4021 to the edges of two adjacent battery cells 201. The colloid branch 4022 not only plays a certain anti-collision and buffering role, but also improves the bonding strength between two adjacent battery cells 201. Among them, the glue portion is a thermally conductive glue that flows through the exhaust glue port 501 and enters between the pad 5 and the colloid baffle 3, which can be used to form a partial flattening portion 401 and a partial overflow portion 402. After passing through the exhaust glue port 501, part of the thermally conductive glue will eventually remain and fill the exhaust glue port 501 to ensure the height uniformity between the battery module 2 and the liquid cooling plate 101, refer to Figure 2 shown.

[0075] In particular, refer to Figure 6 、 Figure 7 and Figure 8 The edges of the battery cell 201 are the edges of two adjacent surfaces. The edge between the two side surfaces of the battery cell 201 is provided with a first chamfer 2014, the edges of the side surfaces and the bottom surface are provided with a second chamfer 2015, and the intersection of the edges of the two adjacent side surfaces and the bottom surface is also provided with a third chamfer 2016. The colloid branch 4022 can be filled in the first chamfer 2014 and the third chamfer 2016 of the battery cell 201. At the same time, the colloid trunk 4021 can be fully filled in the second chamfer 2015 of the battery cell 201, and is completely fitted with these chamfers through the overflow portion 402, thereby increasing the bonding strength of the battery cell 201.

[0076] If necessary, a gap can be left between the large surfaces of two battery cells 201 to allow the colloid branch 4022 to extend between the large surfaces of the two battery cells 201, thereby increasing the adhesion between the two battery cells 201 and the bonding strength of the entire battery module 2. The colloid branch 4022 extending between the large surfaces of the two battery cells 201 can also improve temperature uniformity between the battery cells 201. In this case, the seam between two adjacent battery cells 201 is set at the center of this gap, so that the master exhaust glue port 501 is directly opposite the middle position between the two adjacent battery cells 201.

[0077] In addition, if a thermal insulation pad or buffer pad is installed between two adjacent battery cells 201, the seam between the two adjacent battery cells 201 is set at the center of the thermal insulation pad or buffer pad, so that the exhaust glue port 501 can be directly facing the middle position of the two adjacent battery cells 201, ensuring the connection consistency between the two adjacent battery cells 201. In this case, the colloid branch 4022 extends between the two battery cells 201 and can also connect with the thermal insulation pad or buffer pad, improving the reliability of the thermal insulation pad or buffer pad. Figure 8In this embodiment, the battery cell 201 includes a battery body 2011 and a protective film 2012 attached to the outside of the battery body 2011 through a hemming process. The hemming seam 2013 of the protective film 2012 is located at the lower portion of the battery body 2011 near the colloid barrier strip 3, so that the overflow portion 402 at least partially covers the hemming seam 2013.

[0078] Furthermore, the height of the colloid barrier strip 3 is greater than the height of the edge seam 2013 , so that the overflow portion 402 completely covers the edge seam 2013 .

[0079] Typically, protective film 2012 is a blue film. For square cells, the blue film is typically applied using a hemming process to prevent stress concentration at the edges that could puncture the film. This hemming process creates hemming seams 2013. Typically, the blue film is sealed with adhesive, so this hemming seam 2013 is susceptible to water ingress. The specific hemming process for blue film is conventional and will not be detailed in this embodiment.

[0080] The key point of this embodiment is that, considering that the battery cell 201 will expand to a certain extent during operation, there is a risk of stretching the edge seam 2013. At the same time, if there is leakage, liquid can easily enter through the edge seam 2013. Therefore:

[0081] On the one hand, the edge seam 2013 is set at a position of the battery cell 201 close to the overflow portion 402 so that the overflow portion 402 can perform secondary sealing on the edge seam 2013;

[0082] On the other hand, the height of the longitudinal spacing space is controlled so that, after curing and forming within the longitudinal spacing space, the overflow portion 402 is sufficient to completely cover the side of the battery cell 201, thereby completely sealing the edge seam 2013. For example, if the height of the edge seam 2013 is 10 mm, the height of the colloid barrier strip 3 can be designed to be 15 mm so that the height of the overflow portion 402 after curing can also reach 10 mm or more, thereby completely covering the edge seam 2013. Specifically, the height of the colloid barrier strip 3 is greater than or equal to the height of the overflow portion 402, allowing the overflow portion 402 to reach the desired height. Furthermore, the height of the overflow portion 402 is greater than or equal to the height of the edge seam 2013, allowing the overflow portion 402 to completely seal the edge seam 2013, thereby preventing the risk of the edge seam 2013 from expanding and preventing liquid from entering. The edge seam 2013 can be a straight line, an arc, or the like, and its height is its maximum height.

[0083] In summary, the battery pack provided in this embodiment has at least the following advantages:

[0084] ① Directed colloid control: A longitudinal spacing space is formed between the colloid barrier strip 3 and the battery module 2 to guide the colloid to overflow upward, avoid ineffective lateral spreading, and improve bonding strength and material utilization.

[0085] ② Bubble Elimination and Overflow Support: The thinned area of the spacer strip 5 forms an air vent 501 to expel air and excess glue, ensuring a uniform, bubble-free adhesive layer while also maintaining the height of the overflow. ③ Cell Joint Strengthening: The air vent 501 is aligned with the seam of the cell 201, and the glue filling enhances the bonding strength and heat dissipation of the seam.

[0086] ④ Anti-collision and buffering: The colloid branches 4022 extend to the edges of adjacent battery cells 201 to improve buffering performance and local adhesion.

[0087] ⑤ Height adaptation: The height of the colloid barrier strip 3 is greater than the edge seam 2013 , ensuring that the overflow portion 402 completely seals the edge seam, reducing the risk of failure and improving the reliability of the battery cell 201 .

[0088] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A battery pack, characterized in that: include: A battery box (1), wherein a plurality of battery compartments are provided inside the battery box (1); A plurality of battery modules (2) arranged in one-to-one correspondence with each of the battery compartments, the battery modules (2) being located in the middle of the corresponding battery compartment; A plurality of colloid baffles (3), each of the colloid baffles (3) being located at an edge of each of the battery compartments and having a longitudinal spacing space between the colloid baffles and the corresponding battery module (2); A heat-conducting adhesive layer (4), the heat-conducting adhesive layer (4) comprising a flat portion (401) located at the bottom of the battery module (2), and an overflow portion (402) located in the longitudinal spacing space and connected to an edge of the flat portion (401).

2. The battery pack according to claim 1, wherein: Also includes: A plurality of heightening bars (5), each of the heightening bars (5) is fixedly arranged in the battery compartment and arranged corresponding to the bottom of the battery module (2), so that a horizontal spacing space for accommodating the flattening portion (401) is left between the bottom surface of the battery module (2) and the bottom of the battery compartment.

3. The battery pack according to claim 2, wherein: Each of the heightening strips (5) is arranged parallel to the colloid baffle strip (3), and the heightening strip (5) close to the colloid baffle strip (3) is provided with a plurality of thinning areas; The thinned area forms an exhaust glue outlet (501) for air and heat-conducting glue to flow from the transverse spacing space to the longitudinal spacing space.

4. The battery pack according to claim 3, wherein: The cross-sectional area of the exhaust glue outlet (501) remains unchanged in the direction approaching the glue blocking strip (3).

5. The battery pack according to claim 3, wherein: The cross-sectional area of the exhaust glue outlet (501) gradually increases in a direction approaching the glue blocking strip (3).

6. The battery pack according to claim 3, characterized in that: The battery module (2) comprises a plurality of battery cells (201) arranged along the length direction of the heightening strip (5). The exhaust glue port (501) is arranged opposite to the joint position between two adjacent battery cell units (201).

7. The battery pack according to claim 6, characterized in that: The overflow portion (402) and the glue passing portion located at the exhaust glue passing port (501) both comprise a glue main trunk (4021) arranged parallel to each of the battery cells (201), and a glue branch (4022) extending from the glue main trunk (4021) to between the edges of two adjacent battery cells (201).

8. The battery pack according to claim 1, wherein: The battery box (1) comprises a liquid cooling plate (101), a box frame (102) fixed to an edge of the liquid cooling plate (101) and cooperating with the liquid cooling plate (101) to surround and form an upwardly opening inner box space, and a longitudinal and transverse beam assembly (103) located in the inner box space and dividing the inner box space into the battery compartments. in, The colloid baffle (3) is bonded and fixed to the liquid cooling plate (101), and the side of the colloid baffle (3) away from the battery module (2) abuts against the box frame (102) to limit the colloid baffle (3) from shifting laterally after the overflow portion (402) solidifies.

9. The battery pack according to claim 1, wherein: The battery module (2) comprises a plurality of battery cells (201), wherein the battery cells (201) comprise a battery cell body (2011) and a protective film (212) attached to the outside of the battery cell body (2011) by a wrapping process; The edge seam (2013) of the protective film (2012) is located at the lower part of the side of the battery cell body (2011) close to the colloid barrier strip (3), so that the overflow portion (402) at least partially covers the edge seam (2013).

10. The battery pack according to claim 9, characterized in that: The height dimension of the colloid barrier strip (3) is greater than the height dimension of the edge-wrapped seam (2013), so that the overflow portion (402) completely covers the edge-wrapped seam (2013).

Images