Battery pack and electric device

Abstract

This application relates to the field of battery technology, and particularly to a battery pack and an electrical device. The battery pack includes three mutually perpendicular directions: a first direction, a second direction, and a third direction. The battery pack includes a housing, a cell assembly, a separator, and a first adhesive layer. The housing includes a bottom plate and a frame, which define a receiving cavity. The cell assembly is disposed within the receiving cavity and includes multiple individual cells arranged along the second direction. Along the first direction, each individual cell includes a connecting sidewall. The separator is located on one side of each individual cell along the first direction and is connected to the connecting sidewall. Along the third direction, there is a gap between the separator and the bottom plate. Along the first direction, the side of the separator closest to the cell assembly includes a first adhesive sidewall, and a glue-applying space exists between the first adhesive sidewall and the connecting sidewall, communicating with the gap. The first adhesive layer is disposed in the glue-applying space and adheres to the first adhesive sidewall and the connecting sidewall. The electrical device includes the aforementioned battery pack. This battery pack and electrical device have high structural safety.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] In the production process of power batteries, adhesive layers are typically used to bond and fix the battery cells to the casing. Currently, it is difficult to control the uniformity of the adhesive application to the battery cells, which can easily lead to poor bonding or adhesive overflow that affects the assembly of other components. Summary of the Invention

[0003] The main purpose of this application is to propose a battery pack and power supply device, which aims to solve the technical problem that the uniformity of the adhesive coating inside the box is difficult to control, affecting the bonding strength of the battery cell pack inside the box or making the assembly of other components difficult.

[0004] To achieve the above objectives, in a first aspect, this application proposes a battery pack including a first direction, a second direction, and a third direction that are mutually perpendicular to each other, wherein the battery pack includes: A housing, the housing including a base plate and a frame, the frame being connected to the base plate on the third-party upward side, the base plate and the frame defining a receiving cavity; A battery cell assembly is disposed within the receiving cavity. The battery cell assembly includes a plurality of individual cells arranged along the second direction. Along the first direction, each individual cell includes a connecting sidewall. A separator is located on one side of the single cell along the first direction, and the separator is connected to the connecting sidewall; along the third direction, there is a gap between the separator and the bottom plate; along the first direction, the side of the separator near the cell assembly includes a first adhesive sidewall, and there is an adhesive space between the first adhesive sidewall and the connecting sidewall, the adhesive space communicating with the gap; A first adhesive layer is disposed at least within the adhesive application space, and the first adhesive layer adheres to the first adhesive sidewall and the connecting sidewall.

[0005] In some embodiments, along the third direction, the side of the base plate near the receiving cavity includes a second adhesive sidewall, and along the third direction, the side of the cell assembly near the base plate includes a connecting bottom wall; The battery pack further includes a second adhesive layer, which is bonded at least between the connecting bottom wall and the second adhesive side wall.

[0006] In some embodiments, a receiving space is formed between the separator, the individual battery cell, and the base plate, and at least a portion of the receiving space forms the gap; wherein the battery pack is configured to include any of the following features: (a) The first adhesive layer and the second adhesive layer are partially located within the receiving space, the first adhesive layer is located on the side of the second adhesive layer facing away from the base plate along the third direction, and the first adhesive layer is connected to the second adhesive layer; (b) The second adhesive layer is located within the receiving space, and the second adhesive layer is connected to the side of the partition facing the bottom plate along the third direction; (c) The second adhesive layer is located within the receiving space and is spaced apart from the partition along the third direction.

[0007] In some embodiments, the frame includes longitudinal beams spaced apart on one side of the battery cell assembly along the first direction, and the partition, the battery cell assembly, the base plate and the longitudinal beams form a receiving space, at least a portion of the receiving space forming the gap.

[0008] In some embodiments, the longitudinal beam includes a first connecting portion and at least two side plates, the two side plates being disposed opposite each other along the first direction, each side plate including a straight portion and an inclined portion connected to each other along the third direction, the first connecting portion including a body portion and two first ends disposed opposite each other, the two first ends being disposed at opposite ends of the body portion along the first direction, the body portion being connected to the bottom plate, and the two first ends being connected to the two inclined portions respectively; Along the third direction, the two straight portions are arranged parallel to each other; along the first direction, the two inclined portions extend inclinedly in opposite directions. The side plate and the connecting side wall are spaced apart from each other, and along the first direction, the partition is disposed between the connecting side wall and the straight portion.

[0009] In some embodiments, the longitudinal beam further includes a second connecting portion. Along the third direction, the second connecting portion and the first connecting portion are disposed opposite to each other. The second connecting portion has two oppositely disposed second ends, and the two second ends are respectively connected to the two straight portions. Along the first direction, the size of the first connecting portion is larger than the size of the second connecting portion. The battery pack also includes a connector that connects the first connecting part and the base plate.

[0010] In some embodiments, the frame further includes a crossbeam, the battery pack further includes an end plate, the crossbeam is connected to the base plate and the longitudinal beam, and along the second direction, the crossbeam is disposed on one side of the cell assembly; the end plate is disposed between the cell assembly and the crossbeam; Along the second direction, at least a portion of the partition extends to one side of the end plate, and the end plate and the partition are spaced apart along the first direction; The battery pack further includes a first sealing element. Along the first direction, the first sealing element is disposed between the end plate and the separator. The end of the cell assembly along the second direction, the end plate, and the separator are all connected to the first sealing element. The first sealing element is used to seal the gap and the glue application space.

[0011] In some embodiments, both the first adhesive layer and the second adhesive layer are thermally conductive adhesives, and the first adhesive layer and the second adhesive layer have the same thermal conductivity. Alternatively, the first adhesive layer is a thermally conductive adhesive, the second adhesive layer is a structural adhesive, and the thermal conductivity of the first adhesive layer is greater than that of the second adhesive layer.

[0012] In some embodiments, along the third direction, the gap has a first height H1, where H1 satisfies: 12mm ≤ H1 ≤ 18mm.

[0013] In some embodiments, along the second direction, the separator extends from one end of the cell assembly to the other end, and the connecting sidewall of each individual cell is connected to the separator.

[0014] In some embodiments, the battery pack further includes a second adhesive blocking member, which is disposed along the third direction on the side of the adhesive application space opposite to the gap, and the second adhesive blocking member is connected between the first adhesive sidewall and the connecting sidewall.

[0015] Secondly, this application proposes an electrical device, comprising: The battery pack as described in any of the above embodiments.

[0016] Compared with the prior art, the beneficial effects of this application are: In the technical solution of this application, in practical application, the separator is bonded to one side of the individual battery along the first direction by a first adhesive layer. In order to improve the effective bonding strength between the separator and the individual battery, the first adhesive layer generally needs to be applied in excess. This helps to ensure the uniformity of the coating of the first adhesive layer. When the battery pack is placed in the receiving cavity of the housing, the first adhesive layer may overflow from the glue application space due to compression. Since there is a reserved gap between the separator and the bottom plate, and the gap connects to the glue application space, the excess first adhesive layer overflowing from the glue application space will flow directionally into the gap. With the above structure, on the one hand, by setting gaps, the first adhesive layer overflowing from the glue application space can be collected in a directional manner, preventing the first adhesive layer from spreading randomly in all directions. This ensures the bonding and fixing effect of the battery cell assembly and avoids the first adhesive layer overflowing into other areas and affecting the assembly of other components. On the other hand, the battery pack usually contains multiple battery cell assemblies arranged along the first direction, and the separator is set between two adjacent battery cell assemblies. Thus, the gap is set between two adjacent battery cell assemblies. If the first adhesive layer overflows from the glue application space into the gap, the first adhesive layer will fill the gap. At this time, the first adhesive layer can bond the two adjacent battery cell assemblies, which helps to improve the structural strength of the battery pack.

[0017] Electrical devices using the aforementioned battery packs have high structural strength and safety in use. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a battery pack provided in one embodiment of this application; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a structural cross-sectional view of a battery pack provided in an embodiment of this application; Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a schematic diagram of the structure of a longitudinal beam provided in one embodiment of this application.

[0020] Explanation of icon numbers: 10. Battery pack; 100. Box body; 110. Base plate; 120. Longitudinal beam; 130. Receiving cavity; 140. Frame; 111. Second adhesive sidewall; 121. Side plate; 122. First connecting part; 123. Second connecting part; 1211. Straight section; 1212. Inclined section; 1221. Main body; 1222. First end portion; 1231, Second end; 200. Battery cell pack; 210. Single cell; 220. Connecting bottom wall; 211. Connecting sidewalls; 300. Partition; 310. First adhesive sidewall; 400, gap; 500, First adhesive layer; 600, Second adhesive layer; 700. Connectors; 800. Containment Space; 900, crossbeam; 1000, end plate; 1100, First section of rubber parts; 2000, glue application space; 3000, Second-stage rubber parts; X, first direction; Y, second direction; Z, Third-party orientation.

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] In the production process of power batteries, after the cell assembly is coated with an adhesive layer (such as polyurethane, acrylic, etc.), it is then bonded and fixed to the casing to enhance structural strength and improve heat dissipation performance. Currently, the uniformity of the adhesive coating on the cell assembly is poor, resulting in poor bonding performance.

[0026] For example, in order to ensure the bonding stability of the battery pack inside the box, an excessive amount of adhesive layer is usually applied. When the battery pack is placed into the box, the adhesive layer may overflow due to the pressure, which will result in insufficient actual bonding strength of the battery pack and fail to effectively improve the structural strength of the battery pack.

[0027] Based on this, in order to solve the technical problem that overflowing adhesive layer easily leads to insufficient actual bonding strength and poor bonding uniformity of battery pack 10, thus failing to effectively improve the structural strength of battery pack 10, referring to Figures 1 to 5 One embodiment of this application provides a battery pack 10, which includes a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. For example, taking the battery cell group 200 in the battery pack 10 as an example, when the battery cell group 200 is placed upright, the terminal post of the battery cell group 200 faces upward. At this time, the first direction X can be the width direction of the battery cell group 200 when it is placed upright, the second direction Y can be the length direction of the battery cell group 200 when it is placed upright, and the third direction Z can be the height direction of the battery cell group 200 when it is placed upright.

[0028] The battery pack 10 includes a housing 100, a cell assembly 200, a separator 300, and a first adhesive layer 500.

[0029] The housing 100 includes a base plate 110 and a frame 140, the frame 140 being connected to one side of the base plate 110 in the third direction Z, the base plate 110 and the frame 140 defining a receiving cavity 130. Exemplarily, the base plate 110 and the frame 140 may be integrally formed, or the base plate 110 and the frame 140 may be welded together.

[0030] The cell assembly 200 is disposed within the receiving cavity 130. The cell assembly 200 and the frame 140 are located on the same side of the base plate 110 in the third direction Z. The cell assembly 200 includes a plurality of individual cells 210 arranged along the second direction Y. Along the first direction X, each individual cell 210 includes a connecting sidewall 211. Exemplarily, the receiving cavity 130 may be filled with an adhesive layer to bond the cell assembly 200 within the receiving cavity 130.

[0031] The separator 300 is located on one side of the single cell 210 along the first direction X, and the separator 300 is connected to the connecting sidewall 211; along the third direction Z, there is a gap 400 between the separator 300 and the bottom plate 110; along the first direction X, the side of the separator 300 near the cell assembly 200 includes a first adhesive sidewall 310, and there is a glue-applying space 2000 between the first adhesive sidewall 310 and the connecting sidewall 211, and the glue-applying space 2000 communicates with the gap 400.

[0032] A first adhesive layer 500 is disposed at least within the adhesive application space 2000, and the first adhesive layer 500 bonds the first adhesive sidewall 310 and the connecting sidewall 211. For example, the first adhesive layer 500 can be a thermally conductive adhesive, and the first adhesive layer 500 can minimize the gap between the first adhesive sidewall 310 and the connecting sidewall 211, that is, the first adhesive layer 500 can minimize the gap between the separator 300 and the individual battery 210. With the above structure, the operating heat generated by the individual battery 210 during operation can be transferred to the separator 300 through the first adhesive layer 500. The separator 300 can prevent the accumulation of operating heat generated by the individual battery 210, thereby facilitating the cooling of the individual battery 210 and improving the safety of the battery pack 10.

[0033] Specifically, in practical applications, the separator 300 is bonded to one side of the individual battery 210 along the first direction X by the first adhesive layer 500. To improve the effective bonding strength between the separator 300 and the individual battery 210, the first adhesive layer 500 needs to be applied in excess. This helps to ensure the uniformity of the coating of the first adhesive layer 500. When the cell assembly 200 is placed in the receiving cavity 130 of the housing 100, the first adhesive layer 500 may overflow from the glue application space 2000 due to compression. Since there is a reserved gap 400 between the separator 300 and the bottom plate 110, and the gap 400 connects to the glue application space 2000, the excess first adhesive layer 500 overflowing from the glue application space 2000 will flow directionally into the gap 400.

[0034] With the above structure, on the one hand, by setting the gap 400, the first adhesive layer 500 overflowing from the glue application space 2000 can be collected in a directional manner, preventing the first adhesive layer 500 from spreading randomly in all directions and ensuring the structural safety of the battery pack 10; on the other hand, the battery pack 10 usually contains multiple sets of cell groups 200 arranged along the first direction X, and the separator 300 is arranged between two adjacent sets of cell groups 200, and the gap 400 is arranged between two adjacent sets of cell groups 200. If the first adhesive layer 500 overflows from the glue application space 2000 into the gap 400, the first adhesive layer 500 will fill the gap 400. At this time, the first adhesive layer 500 can bond the two adjacent sets of cell groups 200, which is beneficial to improving the structural strength of the battery pack 10.

[0035] Reference Figure 3 and Figure 4 In some embodiments, along the third direction Z, the side of the base plate 110 near the receiving cavity 130 includes a second adhesive sidewall 111, and along the third direction Z, the side of the cell assembly 200 near the base plate 110 includes a connecting bottom wall 220. The battery pack 10 also includes a second adhesive layer 600, which is at least bonded between the connecting bottom wall 220 and the second adhesive sidewall 111.

[0036] For example, the second adhesive layer 600 can be a thermally conductive adhesive. On the one hand, the second adhesive layer 600 can minimize the gap between the connecting bottom wall 220 and the second adhesive side wall 111, that is, the second adhesive layer 600 can minimize the gap between the cell assembly 200 and the base plate 110. With the above structure, the working heat generated by the cell assembly 200 during operation can be transferred to the base plate 110 through the second adhesive layer 600, avoiding the accumulation of working heat generated by the cell assembly 200 at the bottom, achieving effective heat dissipation of the cell assembly 200, and ensuring the safety of the battery pack 10. On the other hand, the second adhesive layer 600 can stably bond the cell assembly 200 to the base plate 110, preventing the cell assembly 200 from shaking in the receiving cavity 130, and improving the structural strength of the battery pack 10.

[0037] Alternatively, the second adhesive layer 600 can also be a structural adhesive. By adopting the above structure, the bonding stability and reliability of the cell assembly 200 on the base plate 110 can be improved, preventing the cell assembly 200 from falling off the base plate 110 after being impacted, and ensuring the structural strength and safety of the battery pack 10.

[0038] Specifically, in practical applications, to improve the effective bonding strength between the cell assembly 200 and the base plate 110, an excess of the second adhesive layer 600 is typically applied to the base plate 110. When the cell assembly 200 is lowered into the receiving cavity 130, the cell assembly 200 adheres to the second adhesive layer 600 while simultaneously pressing the second adhesive layer 600 downwards. Since there is a gap 400 along the third direction Z between the base plate 110 and the separator 300, the pressed second adhesive layer 600 will overflow directionally into the gap 400. With this structure, on the one hand, the excess second adhesive layer 600, after being pressed, will overflow directionally into the gap 400 instead of spreading randomly, which helps ensure the structural safety of the battery pack 10 and prevents the overflowing second adhesive layer 600 from damaging the structure of the battery pack 10; on the other hand, the overflowing second adhesive layer 600 can fill the gap 400, achieving effective bonding between the cell assemblies 200 located on both sides of the gap 400, which helps improve the overall structural strength of the battery pack 10.

[0039] Reference Figure 3 and Figure 4 In some embodiments, the separator 300, the individual battery cell 210, and the base plate 110 form a receiving space 800, and at least a portion of the receiving space 800 forms a gap 400. One possible implementation is that the first adhesive layer 500 and the second adhesive layer 600 are partially located within the receiving space 800, with the first adhesive layer 500 located on the side of the second adhesive layer 600 facing away from the base plate 110 along a third direction (Z), and the first adhesive layer 500 is connected to the second adhesive layer 600. In other words, excess of both the first adhesive layer 500 and the second adhesive layer 600 can overflow into the gap 400, and the first adhesive layer 500 and the second adhesive layer 600 can contact each other within the gap 400. With this structure, since the first adhesive layer 500 and the second adhesive layer 600 can completely fill the gap 400, the effective bonding strength of the battery pack 10 can be improved, ensuring the structural stability and reliability of the battery pack 10.

[0040] Alternatively, another possible implementation is that the second adhesive layer 600 is partially located within the receiving space 800, and the second adhesive layer 600 is connected to the side of the separator 300 facing the bottom plate 110 in the third direction Z. In other words, the amount of the first adhesive layer 500 is moderate, so that the first adhesive layer 500 does not overflow into the gap 400, while the amount of the second adhesive layer 600 is excessive. In this case, the second adhesive layer 600 will fill the gap 400 after being compressed and bond to the separator 300. With the above structure, it is possible to ensure that the second adhesive layer 600 overflows directionally into the gap 400, prevent the second adhesive layer 600 from spreading randomly in all directions, and improve the structural strength of the battery pack 10.

[0041] Alternatively, another possible implementation is that the second adhesive layer 600 is partially located within the receiving space 800, spaced apart from the partition 300 along the third direction Z. In other words, the amount of the first adhesive layer 500 is moderate, preventing it from overflowing into the gap 400, while the amount of the second adhesive layer 600 is excessive, causing it to partially fill the gap 400 after being compressed. Using this structure, the application amount of the first adhesive layer 500 and the second adhesive layer 600 can be precisely controlled, preventing waste of both layers.

[0042] Reference Figures 3 to 5 In some embodiments, the frame 140 includes longitudinal beams 120, which are spaced apart on one side of the battery cell assembly 200 along the first direction X. The partition 300, the battery cell assembly 200, the bottom plate 110 and the longitudinal beams 120 form a receiving space 800, and at least a portion of the receiving space 800 forms a gap 400.

[0043] Specifically, the longitudinal beam 120 divides the receiving cavity 130 into multiple chambers, each of which houses a battery cell assembly 200. A receiving space 800 is located on the side of the battery cell assembly 200 adjacent to the longitudinal beam 120, with at least a portion of the receiving space 800 forming a gap 400. Using this structure, the receiving space 800 can accommodate a sufficient amount of excess adhesive, ensuring that the excess adhesive flows directionally through the gap 400 into the receiving space 800, preventing it from spreading randomly and improving the structural safety of the battery pack 10. When the excess adhesive flows into the receiving space 800, it can bond the battery cell assembly 200 to the longitudinal beam 120, thereby improving the overall structural strength of the battery pack 10.

[0044] Reference Figure 4 and Figure 5In some embodiments, the longitudinal beam 120 includes a first connecting portion 122 and at least two side plates 121. The two side plates 121 are arranged opposite each other along a first direction X. Each side plate 121 includes a straight portion 1211 and an inclined portion 1212 connected to each other along a third direction Z. The first connecting portion 122 includes a body portion 1221 and two oppositely arranged first ends 1222. The two first ends 1222 are respectively disposed at opposite ends of the body portion 1221 along the first direction X. The body portion 1221 is connected to the bottom plate 110. More specifically, the body portion 1221 is connected to the second adhesive sidewall 111, and the two first ends 1222 are respectively connected to the two inclined portions 1212. Along the third direction Z, the two straight portions 1211 are arranged parallel to each other; along the first direction X, the two inclined portions 1212 extend inclinedly in opposite directions. In other words, when the battery pack 10 is placed upright (with the battery pack 10's terminals facing upwards), along the third direction Z, the lower end of the longitudinal beam 120 gradually widens beyond its upper end. The side plate 121 and the connecting side wall 211 are spaced apart from each other, and along the first direction X, the partition 300 is disposed between the connecting side wall 211 and the straight portion 1211.

[0045] Specifically, along the first direction X, the width of the first connecting portion 122 is larger than the distance between the two oppositely arranged side plates 121, and the body portion 1221 of the first connecting portion 122 is connected to the second adhesive side wall 111 (for example, the body portion 1221 can be glued to the second adhesive side wall 111), so that the body portion 1221 and the second adhesive side wall 111 have a larger contact area, which is beneficial to improving the connection stability between the longitudinal beam 120 and the base plate 110 and improving the structural strength of the battery pack 10.

[0046] Since the two inclined portions 1212 extend in opposite directions along the first direction X, that is, the two inclined portions 1212 extend outward along the first direction X, the horizontal distance between the inclined portion 1212 and the connecting sidewall 211 along the first direction X is smaller than the horizontal distance between the straight portion 1211 and the connecting sidewall 211. In other words, the horizontal distance between the inclined portion 1212 and the connecting sidewall 211 along the first direction X is smaller than the horizontal distance between the straight portion 1211 and the connecting sidewall 211. Therefore, there is a larger space between the straight portion 1211 and the connecting sidewall 211 to accommodate the partition 300, allowing the internal space of the battery pack 10 to be effectively utilized and improving the structural compactness of the battery pack 10.

[0047] Reference Figure 4 and Figure 5In some embodiments, the longitudinal beam 120 further includes a second connecting portion 123. Along the third direction Z, the second connecting portion 123 and the first connecting portion 122 are disposed opposite to each other. The second connecting portion 123 has two oppositely disposed second ends 1231, which are respectively connected to two straight portions 1211. Along the first direction X, the size of the first connecting portion 122 is larger than the size of the second connecting portion 123.

[0048] The battery pack 10 also includes a connector 700, which connects the first connecting portion 122 and the base plate 110. For example, the connector 700 can be a connecting bolt. Both the first connecting portion 122 and the base plate 110 may have through bolt holes, and the connecting bolt can be sequentially inserted into the bolt holes of the base plate 110 and the first connecting portion 122 to achieve a bolted connection between the first connecting portion 122 and the base plate 110.

[0049] One possible implementation is that a receiving groove can be provided on the side of the base plate 110 away from the first connecting part 122. The receiving groove can accommodate the end head of the connecting bolt to ensure the surface flatness of the side of the base plate 110 away from the first connecting part 122 and optimize the structural design of the battery pack 10.

[0050] Specifically, along the first direction X, the size of the first connecting portion 122 is larger than the size of the second connecting portion 123, which increases the contact area between the first connecting portion 122 and the second adhesive sidewall 111, improves the connection strength between the first connecting portion 122 and the second adhesive sidewall 111, and thus improves the connection strength between the longitudinal beam 120 and the base plate 110. Furthermore, in addition to direct contact connection, the first connecting portion 122 and the second adhesive sidewall 111 are also fixedly connected by an external connector 700, further improving the connection strength between the first connecting portion 122 and the second adhesive sidewall 111 and ensuring the structural stability and reliability of the battery pack 10.

[0051] Reference Figure 1 and Figure 2In some embodiments, the frame 140 further includes a crossbeam 900, and the battery pack 10 further includes an end plate 1000. The crossbeam 900 is connected to the base plate 110 and the longitudinal beam 120. Along the second direction Y, the crossbeam 900 is disposed on one side of the cell assembly 200; the end plate 1000 is disposed between the cell assembly 200 and the crossbeam 900. Along the second direction Y, at least a portion of the partition 300 extends to one side of the end plate 1000, and the end plate 1000 and the partition 300 are spaced apart along the first direction X. The battery pack 10 also includes a first sealing element 1100 (for example, the first sealing element 1100 can be a sealing foam or other structure). Along the first direction X, the first sealing element 1100 is disposed between the end plate 1000 and the separator 300. The end of the cell assembly 200 along the second direction Y, the end plate 1000 and the separator 300 are all connected to the first sealing element 1100. The first sealing element 1100 is used to seal the gap 400 and the glue application space 2000.

[0052] Specifically, the first sealing component 1100 can seal the connection gap between the cell assembly 200, the end plate 1000 and the separator 300, making the gap 400 and the glue application space 2000 a sealed space. When the cell assembly 200 is squeezed and glue overflows, the overflow can flow in a direction into the gap 400 and the glue application space 2000, instead of overflowing randomly in all directions along the connection gap between the cell assembly 200, the end plate 1000 and the separator 300, thereby ensuring the structural safety of the battery pack 10.

[0053] In some embodiments, both the first adhesive layer 500 and the second adhesive layer 600 are thermally conductive adhesives, and both have the same thermal conductivity. It should be noted that the thermal conductivity of both the first adhesive layer 500 and the second adhesive layer 600 is greater than that of air.

[0054] Specifically, the first adhesive layer 500, in addition to improving the connection strength between the first adhesive sidewall 310 and the connecting sidewall 211, also fills the connection gap between the first adhesive sidewall 310 and the connecting sidewall 211; the second adhesive layer 600, in addition to improving the connection strength between the second adhesive sidewall 111 and the connecting bottom wall 220, also fills the connection gap between the second adhesive sidewall 111 and the connecting bottom wall 220; since the first adhesive layer 500 and the second adhesive layer 600 have high thermal conductivity, the working heat generated by the battery cell assembly 200 can be transferred to the separator 300 through the first adhesive layer 500 and to the bottom plate 110 through the second adhesive layer 600, thereby achieving heat dissipation of the battery cell assembly 200 and preventing excessive heat accumulation inside the battery cell assembly 200, which is beneficial to improving the safety of the battery cell assembly 200 in use.

[0055] Alternatively, in some other embodiments, the first adhesive layer 500 is a thermally conductive adhesive, and the second adhesive layer 600 is a structural adhesive, wherein the thermal conductivity of the first adhesive layer 500 is greater than that of the second adhesive layer 600. It should be noted that the thermal conductivity of the first adhesive layer 500 is greater than that of air.

[0056] Specifically, the first adhesive layer 500 used to bond the first adhesive sidewall 310 and the connecting sidewall 211 is a thermally conductive adhesive. The working heat generated by the battery cell assembly 200 can be transferred to the separator 300 through the first adhesive layer 500. The thermal conductivity of the separator 300 can then transfer the working heat to the outside of the battery cell assembly 200, thereby cooling the battery cell assembly 200 and improving its operational safety. The second adhesive layer 600 used to bond the second adhesive sidewall 111 and the connecting bottom wall 220 is a structural adhesive. This ensures the bonding strength between the battery cell assembly 200 and the bottom plate 110, improves the bonding stability and reliability of the battery cell assembly 200 within the housing 100, prevents the battery cell assembly 200 from shaking within the housing 100, and enhances the structural strength of the battery pack 10.

[0057] Reference Figure 4 In some embodiments, along the third direction Z, the gap 400 has a first height H1, where H1 satisfies: 12mm ≤ H1 ≤ 18mm. For example, the value of H1 can be 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, etc.

[0058] Specifically, setting the first height of the gap 400 within the aforementioned range ensures, on the one hand, that the gap 400 can accommodate more excess adhesive and prevents the excess adhesive from filling the gap 400 and spreading randomly to the surroundings; on the other hand, it ensures that there is sufficient contact area between the partition 300 and the connecting side wall 211 of the battery cell assembly 200, thereby improving the heat exchange efficiency and effect of the partition 300 on the battery cell assembly 200 and enhancing the safety of the battery cell assembly 200 in use.

[0059] Reference Figure 1 and Figure 3 In some embodiments, along the second direction Y, the separator 300 extends from one end of the cell pack 200 to the other end, and the connecting sidewall 211 of each individual cell 210 is connected to the separator 300.

[0060] Specifically, the length of the separator 300 along the second direction Y is consistent with the length of the cell pack 200 along the second direction Y, so that the separator 300 can be connected to the connection sidewall 211 of each individual cell 210 in the cell pack 200. This ensures that the working heat generated by each individual cell 210 in the cell pack 200 can be effectively transferred to the separator 300, thereby using the separator 300 to absorb heat and cool down each individual cell 210, and improving the safety of each individual cell 210 in use.

[0061] Reference Figure 2 and Figure 4 In some embodiments, the battery pack 10 further includes a second adhesive blocking element 3000, which, exemplarily, may be adhesive blocking foam. The second adhesive blocking element 3000 is disposed along a third direction Z on one side of the adhesive application space 2000 opposite to the gap 400, and the second adhesive blocking element 3000 is connected between the first adhesive sidewall 310 and the connecting sidewall 211.

[0062] Specifically, the second adhesive component 3000 can seal the connection gap between the first adhesive sidewall 310 and the connecting sidewall 211, making the adhesive application space 2000 a sealed space. When the cell assembly 200 is squeezed, due to the blocking effect of the second adhesive component 3000, the overflow of the first adhesive layer 500 can flow into the gap 400, preventing the first adhesive layer 500 from flowing out from the connection gap between the first adhesive sidewall 310 and the connecting sidewall 211, ensuring that the first adhesive layer 500 will not damage the internal structure of the battery pack 10, and improving the structural safety of the battery pack 10.

[0063] In addition, the second rubber component 3000 is generally soft and can absorb the impact force of the battery pack 10 when it is subjected to vibration, ensuring the structural stability of the battery pack 10 and improving the safety of the battery pack 10.

[0064] Correspondingly, another embodiment of this application also provides an electrical device, which includes the battery pack 10 in any of the above embodiments. This electrical device can be used in new energy vehicles, etc.

[0065] Specifically, the electrical device using the aforementioned battery pack 10 has high structural strength and safety in use.

[0066] Thanks to the improvements to the battery pack 10 described above, the power supply device of this embodiment has the same technical effects as the battery pack 10 described above, which will not be repeated here.

[0067] It should be noted that other undisclosed contents of the battery pack 10 and electrical device provided in this application can be found in the prior art, and will not be repeated here.

[0068] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery pack, comprising a first direction, a second direction, and a third direction that are perpendicular to each other, characterized in that, The battery pack includes: A housing, the housing including a base plate and a frame, the frame being connected to the base plate on the third-direction upward side, the base plate and the frame defining a receiving cavity; A battery cell assembly is disposed within the receiving cavity. The battery cell assembly includes a plurality of individual cells arranged along the second direction. Along the first direction, each individual cell includes a connecting sidewall. A separator is located on one side of the single cell along the first direction, and the separator is connected to the connecting sidewall; along the third direction, there is a gap between the separator and the bottom plate; along the first direction, the side of the separator near the cell assembly includes a first adhesive sidewall, and there is an adhesive space between the first adhesive sidewall and the connecting sidewall, the adhesive space communicating with the gap; A first adhesive layer is disposed at least within the adhesive application space, and the first adhesive layer adheres to the first adhesive sidewall and the connecting sidewall.

2. The battery pack according to claim 1, characterized in that, Along the third direction, the side of the base plate near the receiving cavity includes a second adhesive sidewall, and along the third direction, the side of the battery cell assembly near the base plate includes a connecting bottom wall; The battery pack further includes a second adhesive layer, which is bonded at least between the connecting bottom wall and the second adhesive side wall.

3. The battery pack according to claim 2, characterized in that, The separator, the individual battery cell, and the base plate form a receiving space, at least a portion of which forms the gap; wherein the battery pack is configured to include any of the following features: (a) The first adhesive layer and the second adhesive layer are partially located within the receiving space, the first adhesive layer is located on the side of the second adhesive layer facing away from the base plate along the third direction, and the first adhesive layer is connected to the second adhesive layer; (b) The second adhesive layer is located within the receiving space, and the second adhesive layer is connected to the side of the partition facing the bottom plate along the third direction; (c) The second adhesive layer is located within the receiving space and is spaced apart from the partition along the third direction.

4. The battery pack according to claim 1, characterized in that, The frame includes longitudinal beams, which are spaced apart on one side of the battery cell assembly along the first direction. The partition, the battery cell assembly, the base plate, and the longitudinal beams form a receiving space, and at least a portion of the receiving space forms the gap.

5. The battery pack according to claim 4, characterized in that, The longitudinal beam includes a first connecting portion and at least two side plates. The two side plates are arranged opposite to each other along the first direction. Each side plate includes a straight portion and an inclined portion that are connected to each other along the third direction. The first connecting portion includes a body portion and two first ends that are arranged opposite to each other. The two first ends are respectively arranged at opposite ends of the body portion along the first direction. The body portion is connected to the bottom plate. The two first ends are respectively connected to the two inclined portions. Along the third direction, the two straight portions are arranged parallel to each other; along the first direction, the two inclined portions extend inclinedly in opposite directions. The side plate and the connecting side wall are spaced apart from each other, and along the first direction, the partition is disposed between the connecting side wall and the straight portion.

6. The battery pack according to claim 4, characterized in that, The longitudinal beam further includes a second connecting portion. Along the third direction, the second connecting portion and the first connecting portion are arranged opposite to each other. The second connecting portion has two oppositely arranged second ends, and the two second ends are respectively connected to the two straight portions. Along the first direction, the size of the first connecting portion is larger than the size of the second connecting portion. The battery pack also includes a connector that connects the first connecting part and the base plate.

7. The battery pack according to claim 4, characterized in that, The frame also includes a crossbeam, and the battery pack also includes an end plate. The crossbeam is connected to the base plate and the longitudinal beam. Along the second direction, the crossbeam is disposed on one side of the cell assembly. The end plate is disposed between the cell assembly and the crossbeam. Along the second direction, at least a portion of the partition extends to one side of the end plate, and the end plate and the partition are spaced apart along the first direction; The battery pack further includes a first sealing element. Along the first direction, the first sealing element is disposed between the end plate and the separator. The end of the cell assembly along the second direction, the end plate, and the separator are all connected to the first sealing element. The first sealing element is used to seal the gap and the glue application space.

8. The battery pack according to claim 2, characterized in that, Both the first adhesive layer and the second adhesive layer are thermally conductive adhesives, and the first adhesive layer and the second adhesive layer have the same thermal conductivity. Alternatively, the first adhesive layer is a thermally conductive adhesive, the second adhesive layer is a structural adhesive, and the thermal conductivity of the first adhesive layer is greater than that of the second adhesive layer.

9. The battery pack according to claim 1, characterized in that, Along the third direction, the gap has a first height H1, where H1 satisfies: 12mm ≤ H1 ≤ 18mm.

10. The battery pack according to claim 1, characterized in that, Along the second direction, the separator extends from one end of the cell assembly to the other end, and the connecting sidewall of each individual cell is connected to the separator.

11. The battery pack according to claim 1, characterized in that, The battery pack further includes a second adhesive stop, which is disposed along the third direction on the side of the adhesive application space opposite to the gap, and the second adhesive stop is connected between the first adhesive sidewall and the connecting sidewall.

12. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1 to 11.

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