Power storage device and power consuming device

Abstract

This disclosure provides an energy storage device and an electrical device. The energy storage device includes a lower housing, a battery module, and a gel structure layer. The battery module is disposed within the lower housing and includes an end plate. The end plate has a first channel extending along a first direction and a first opening communicating with the first channel. A third opening communicating with the first channel is also provided on the end plate, located near the end of the first opening in a first direction. A gap exists between the lower housing and the end plate. The gel structure layer includes a first gel and a second gel. The first gel is disposed within the first channel, and the second gel extends from the third opening into the gap. The second gel is bonded to the sidewalls of the end plate and the lower housing. Therefore, the energy storage device of this disclosure has the advantages of reducing wire bonding failure in the top area of ​​the energy storage device and improving the mechanical reliability and durability of the energy storage device.

Description

Technical Field

[0001] This disclosure relates to the field of new energy technology, specifically to an energy storage device and an electrical appliance having the energy storage device. Background Technology

[0002] Energy storage devices typically include an outer casing and battery modules housed within the casing, with gaps usually existing between the battery modules and the lower casing of the outer casing. Each battery module is further divided into multiple cell groups, with end plates at both ends of each cell group along its length.

[0003] In related technologies, a colloid is placed between the bottom wall of the battery cell assembly and the outer casing, and the busbar is fixed to the tab bracket on the top of the outer casing. Energy storage devices are prone to reduced discharge performance under vibration or drop conditions. Utility Model Content

[0004] In view of this, the present disclosure aims to provide an energy storage device and an electrical device to solve the problem that energy storage devices in the prior art are prone to reduced discharge performance.

[0005] This disclosure provides an energy storage device.

[0006] This disclosure also provides an electrical appliance.

[0007] The energy storage device of this disclosure includes a lower housing, a battery module, and a gel structure layer.

[0008] The lower housing has a receiving cavity, and one end of the lower housing in a first direction has an assembly port communicating with the receiving cavity. The battery module is disposed in the receiving cavity. The battery module includes a cell assembly and end plates disposed on both sides of the cell assembly in a second direction. The end plates have a first channel extending along the first direction, and the end plates have a first opening on the side of the end plate facing the assembly port in the first direction. The first opening communicates with the first channel. The end plates have a third opening communicating with the first channel. In the second direction, the third opening is located on the outer wall surface of the end plate on the side away from the cell assembly, and the third opening is disposed at the end of the end plate close to the first opening in the first direction. There is a gap between the lower housing and the end plates. The colloid structure layer includes a first colloid and a second colloid connected to each other. The first colloid is disposed in the first channel, and the second colloid extends from the third opening toward the direction away from the assembly port in the gap. The second colloid is bonded to the side walls of the end plates and the lower housing. It is understood that the colloidal structure layer includes a first colloidal material disposed within the first channel and a second colloidal material formed by overflow from the third opening and bonded between the end plate and the lower housing.

[0009] The energy storage device of this disclosure provides a third opening near the upper region on the outer wall surface of the side away from the battery cell assembly in the second direction. A second adhesive layer overflows from this third opening and adheres to the end plate and the lower housing, forming a second adhesive layer. This second adhesive layer provides bonding force between the upper end of the end plate and the lower housing, increasing the firmness between the top region of the end plate and the lower housing, and reducing the "cantilever effect." When the lower housing is impacted, the battery module and lower housing with the added second adhesive layer can transmit the impact force to the entire energy storage device, thereby limiting the lateral or torsional displacement of the top of the battery module relative to the lower housing. This makes the battery module and lower housing more closely resemble a "rigid connection," reducing vibration at the top of the energy storage device and thus reducing the mechanical root cause of wire cracking at the electrical component connections at the top. Therefore, the structural reliability and electrical connection durability of the energy storage device are improved.

[0010] Meanwhile, because the second colloid itself is viscoelastic, it can dissipate energy during vibration, providing shock absorption and cushioning. This further enhances the mechanical reliability of the energy storage device.

[0011] In addition, a first colloid is formed inside the end plate. When subjected to impact, the first colloid inside the end plate can increase the shear force that the end plate can withstand, effectively improving the end plate's resistance to bending.

[0012] The energy storage device of the present disclosure has the advantages of reducing wire bonding failure in the top area of ​​the energy storage device and improving the mechanical reliability and durability of the energy storage device.

[0013] In one embodiment, in the first direction, the end face of the end plate away from the first opening has a second opening communicating with the first channel; the colloid structure layer further includes a third colloid located within the gap, the third colloid extending through the second opening toward the assembly port, the third colloid located on the side of the second colloid away from the assembly port, and the third colloid bonded to the side wall of the end plate and the lower housing.

[0014] In some embodiments, the end plate is provided with a second channel extending along the first direction, the second channel being spaced apart from the first channel, and the end plate is provided with a fourth opening on one side of the end plate facing the assembly port in the first direction, and a fifth opening on the other side of the end plate, the fourth opening and the fifth opening being connected to the second channel;

[0015] In some embodiments, the colloidal structure layer further includes a fourth colloidal body extending through the fourth opening into the gap, and the fourth colloidal body connecting to the third colloidal body. The fourth colloidal body and the second colloidal body are spaced apart in a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] In some embodiments, the second colloid is extended in a strip shape.

[0017] In some embodiments, the second colloid connects to the third colloid.

[0018] In some embodiments, the fourth colloid is extended in a strip shape and is connected to the third colloid.

[0019] In some embodiments, the colloidal structure layer further includes a bottom adhesive disposed on the side of the cell assembly opposite to the assembly port, and the bottom adhesive is bonded between the bottom of the cell assembly and the bottom wall of the lower casing.

[0020] In some embodiments, the end plate includes a first plate portion and a second plate portion that are disposed opposite to each other and spaced apart along the second direction. A plurality of reinforcing ribs are provided between the first plate portion and the second plate portion to divide the first channel into a plurality of sub-cavities. At least two of the sub-cavities are connected. The first colloid is located in the plurality of sub-cavities. The first plate portion is attached to the battery cell assembly. The second plate portion is provided with the third opening.

[0021] In some embodiments, the energy storage device further includes a tab bracket, the tab bracket including a bracket body and buckles connected to both ends of the bracket body in a second direction, the bracket body being disposed on one end of the battery cell assembly facing the assembly port, the buckles being snapped into the third opening, and the buckles being clearance-fitted with the third opening, the buckles being bonded to the end plate through the colloidal structure layer.

[0022] In some embodiments, the bottom wall of the lower housing has a boss, and the end plate abuts against the boss.

[0023] In some embodiments, the battery module further includes side plates disposed opposite to each other on both sides in a third direction, the cell assembly includes a plurality of cells arranged sequentially in the receiving cavity along a second direction, the side plates are fixedly connected to the end plates at both ends in the second direction, and the third direction, the first direction and the second direction are perpendicular to each other.

[0024] In some embodiments, the side plate includes a side plate body and a first side plate flange, the first side plate flange being connected to the end of the side plate body away from the assembly opening in the first direction, the side plate body abutting against the battery cell assembly, and the side plate body being in contact with the side wall surfaces of the plurality of battery cells.

[0025] In some embodiments, the side plate further includes a second side plate folded edge, the second side plate folded edge being connected to one end of the side plate body facing the assembly port in the first direction, and the second side plate folded edge being disposed opposite to one end of the battery cell assembly facing the assembly port;

[0026] In some embodiments, the colloidal structure layer further includes a bottom adhesive, with a gap between the first side plate folds of the two side plates, a portion of the bottom adhesive being bonded to the first side plate fold, and / or another portion of the bottom adhesive being bonded to the wall surface on the side of the cell assembly facing the bottom wall of the lower housing.

[0027] In some embodiments, the colloidal structure layer further includes a side adhesive, the outer side of the side plate having a fin assembly extending along the second direction, the side adhesive being bonded to a portion of the fin assembly near the bottom wall of the lower housing, the end face of the side adhesive facing the assembly port being arranged in a smooth curve, and / or the height of the side adhesive in the first direction first decreasing and then increasing.

[0028] In some embodiments, the fin includes a first fin and a plurality of second fins, the first fin being disposed on the bottom wall closest to the lower housing, and the first fin having an inclined surface extending outwardly from the bottom wall to the mounting opening;

[0029] In some embodiments, the end plate has a second opening at the other end in the first direction that communicates with the first channel, and the height of the second opening is lower than the height of the first fin.

[0030] The electrical equipment disclosed herein includes an energy storage device according to any one of the preceding descriptions. Attached Figure Description

[0031] Figure 1 This is a perspective view of an energy storage device according to an embodiment of the present disclosure.

[0032] Figure 2 This is a top view of an energy storage device according to an embodiment of the present disclosure.

[0033] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0034] Figure 4 This is an exploded view of an energy storage device according to an embodiment of the present disclosure.

[0035] Figure 5 This is yet another exploded view of the energy storage device according to an embodiment of this disclosure.

[0036] Figure 6 yes Figure 5 Enlarged view at point B.

[0037] Figure 7 This is a left view of the energy storage device according to an embodiment of the present disclosure, with the lower housing omitted.

[0038] Figure 8 This is a front view of the energy storage device according to an embodiment of the present disclosure, with the lower housing omitted.

[0039] Figure 9 This is a perspective view of the lower housing according to an embodiment of this disclosure.

[0040] Figure 10 This is a perspective view of the end plate according to an embodiment of this disclosure.

[0041] Figure 11 This is a perspective view of the side panel according to an embodiment of the present disclosure.

[0042] Explanation of reference numerals in the attached figures:

[0043] Lower housing 1; receiving cavity 11; assembly port 12; boss 13;

[0044] Battery module 2; Cell assembly 21; End plate 22; First plate portion 221; Second plate portion 222; Reinforcing rib portion 223; First opening 201; Second opening 202; Third opening 203; Fourth opening 204; Fifth opening 205;

[0045] Side plate 23; side plate body 231; first side plate folded edge 232; second side plate folded edge 233; first fin 234; second fin 235;

[0046] Colloidal structure layer 3; second colloid 32; third colloid 33; fourth colloid 34; bottom colloid 35; side colloid 36;

[0047] 4. Electrode support; 41. Support body; 42. Buckle. Detailed Implementation

[0048] The technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments.

[0049] The following is for reference. Figures 1-11 The present disclosure provides examples of energy storage devices and electrical appliances according to embodiments thereof.

[0050] It should be noted that in existing technologies, the busbars and battery cell terminals in energy storage devices are fixed by welding. In the vertical direction, the bottom of battery module 2 is fixedly connected to the lower casing 1, but the upper part of battery module 2 is in a cantilevered state. Under conditions such as drops, the impact force acts on the lower casing 1, causing battery module 2 to shift relative to the lower casing 1 due to inertia. This impact force can easily be transmitted to the top of battery module 2, causing relative displacement and high-frequency vibration between the upper part of battery module 2 and the outer casing. This vibration can easily be transmitted to the top of the battery cell, causing the weld lines to crack, leading to increased internal resistance or short circuits, and ultimately reducing the discharge performance of the energy storage device.

[0051] The energy storage device of this disclosure includes a lower housing 1, a battery module 2, and a gel structure layer 3.

[0052] The lower housing 1 has a receiving cavity 11, and the lower housing 1 is in a first direction (e.g., Figure 1 One end (as shown in the up-down direction) Figure 1 The upper end shown has an assembly port 12 communicating with the receiving cavity 11 (e.g., Figure 1 The energy storage device also includes an upper cover (not shown in the figure), which is located at the assembly opening 12; the battery module 2 is disposed within the receiving cavity 11, and the battery module 2 includes a cell assembly 21 and a battery assembly disposed in the cell assembly 21 in a second direction (e.g., Figure 1 The end plates 22 on both sides (shown in the left-right direction) have a first channel extending in the first direction, and a first opening 201 on the end face of the end plate 22 facing the assembly port 12 in the first direction, which connects to the first channel; a third opening 203 is opened on the end plate 22 to connect to the first channel. In the second direction, the third opening 203 is located on the outer wall of the end plate 22 away from the cell assembly 21, and the third opening 203 is located at the end of the end plate 22 close to the first opening 201 in the first direction. There is a gap between the lower housing 1 and the end plate 22; the colloid structure layer 3 includes a first colloid (not shown) and a second colloid 32 connected to each other. The first colloid is disposed in the first channel, and the second colloid 32 extends from the third opening 203 in the gap in the direction away from the assembly port 12, and the second colloid 32 is bonded to the side wall of the end plate 22 and the lower housing 1. It is understood that the colloidal structure layer 3 includes a first colloid disposed in the first channel and a second colloid 32 formed by overflowing from the third opening 203 and bonded between the end plate 22 and the lower housing 1.

[0053] The energy storage device of this embodiment features a third opening 203 on the outer wall surface near the upper region on the side away from the battery cell assembly 21 in the second direction. A second adhesive 32 overflows from the third opening 203 and adheres to the end plate 22 and the lower housing 1, forming a second adhesive 32. This second adhesive 32 provides bonding force to the area between the upper end and the lower housing 1, increasing the firmness between the top region of the end plate 22 and the lower housing 1 and reducing the "cantilever effect." When the lower housing 1 is impacted, the battery module 2 and the lower housing 1 with the added second adhesive 32 can transmit the impact force to the entire energy storage device, thereby limiting the lateral or torsional displacement of the top of the battery module 2 relative to the lower housing 1. This makes the battery module 2 and the lower housing 1 closer to a "rigid connection," reducing vibration at the top of the energy storage device and thus reducing the mechanical root cause of wire cracking at the electrical component connections at the top. Therefore, the structural reliability and electrical connection durability of the energy storage device are improved.

[0054] Meanwhile, because the second colloid 32 itself is viscoelastic, it can dissipate energy during vibration, providing shock absorption and cushioning. This further enhances the mechanical reliability of the energy storage device.

[0055] In addition, a first colloid is formed inside the end plate 22. When subjected to impact, the first colloid inside the end plate 22 can increase the shear force that the end plate 22 can withstand, effectively improving the bending resistance of the end plate 22.

[0056] The energy storage device of the present disclosure has the advantages of reducing wire bonding failure in the top area of ​​the energy storage device and improving the mechanical reliability and durability of the energy storage device.

[0057] Specifically, the first colloid is a colloid that is poured into the first channel through the colloid filling hole and then cured. The second colloid 32 overflows from the first channel through the third opening 203 and cures on the end plate 22 and the lower housing 1.

[0058] like Figure 5 and Figure 10 As shown, in the first direction, the end face of the end plate 22 away from the first opening 201 has a second opening 202 communicating with the first channel; the colloid structure layer 3 also includes a third colloid 33 located in the gap, the third colloid 33 extends through the second opening 202 toward the direction close to the assembly port 12, the third colloid 33 is located on the side of the second colloid 32 away from the assembly port 12, and the third colloid 33 is bonded to the side wall of the end plate 22 and the lower housing 1.

[0059] The energy storage device of this embodiment, by adding a third colloid 33, can increase the connection area between the end plate 22 and the lower housing 1, thereby uniformly transferring the load to the entire bonding surface, improving stress distribution, and avoiding stress concentration. This is beneficial for further improving the robustness of the connection between the end plate 22 and the lower housing 1, as well as their combined load-bearing capacity.

[0060] Preferably, the second colloid 32 is connected to the third colloid 33.

[0061] The energy storage device of this embodiment connects the second colloid 32 (longitudinal) and the third colloid 33 (transverse), which is equivalent to setting an "anchoring node" in the colloid. This effectively prevents cracks in the colloid structure layer 3 from propagating along a single path under vibration. Moreover, the intersection point couples and redistributes forces in different directions, and the impact or vibration load is quickly dispersed to a larger area, avoiding the problem of local stress concentration. Therefore, the energy storage device of this embodiment improves the mechanical strength of the bonding interface between the end plate 22 and the lower housing 1.

[0062] Furthermore, such as Figure 4 and Figure 5 As shown, the second colloid 32 extends in a strip shape, and the third colloid 33 fills the gap accordingly.

[0063] The energy storage device of this embodiment, by extending the second colloid 32 in a strip-like distribution, can reduce colloid waste while ensuring the connection strength between the lower housing 1 and the top of the end plate 22. The third colloid 33, which conformally fills the gap, can prevent unfilled areas between the lower region of the lower housing 1 and the end plate 22, thereby further increasing the stability of the connection between the lower housing 1 and the end plate 22.

[0064] like Figure 2 , Figure 4 and Figure 10 As shown, the end plate 22 has a second channel extending along a first direction, the second channel being spaced apart from the first channel. The end plate 22 has a fourth opening 204 on one side of its end face facing the assembly port 12 in the first direction, and a fifth opening 205 on the other side of its end face. Both the fourth and fifth openings 204 communicate with the second channel. The colloidal structure layer 3 also includes a fourth colloidal material 34, which extends through the fourth opening 204 into the gap. The fourth colloidal material 34 connects to a third colloidal material 33. The fourth colloidal material 34 and the second colloidal material 32 are in a third direction (e.g., ...). Figure 1 The front and rear directions shown are spaced apart, with the first, second, and third directions perpendicular to each other. In other words, the added fourth adhesive 34 is equivalent to increasing the bonding surface between the top of the end plate 22 and the lower housing 1.

[0065] The energy storage device of this embodiment can further increase the bonding area between the top of the end plate 22 and the lower housing 1 by adding a fourth colloid 34.

[0066] like Figure 5 and Figure 7 As shown, the fourth colloid 34 extends in a strip shape and is connected to the third colloid 33.

[0067] The energy storage device of this embodiment, by connecting the fourth colloid 34 with the third colloid 33, similarly helps to further increase the stability of the connection between the lower housing 1 and the end plate 22.

[0068] Optionally, the fourth colloid 34 is the excess colloid that overflows from the fourth opening 204 or is misaligned with the injection port and forms on the outer wall surface of the end plate 22.

[0069] Optionally, there can be multiple fourth colloids 34, each of which is spaced apart from the second colloid 32 in a third direction. For example, as Figure 5 and Figure 7 As shown, there are two fourth colloids 34, and the two fourth colloids 34 extend in strips to the third colloid 33.

[0070] like Figure 8 As shown, the colloidal structure layer 3 also includes a bottom colloidal layer 35, which is disposed on the side of the cell assembly 21 opposite to the assembly port 12, and is bonded between the bottom of the cell assembly 21 and the bottom wall of the lower housing 1.

[0071] The energy storage device of this disclosure can increase the firmness of the connection between the battery cell assembly 21 and the lower housing 1 by adding a bottom colloid 35.

[0072] In some embodiments, at least one of a fourth colloid 34 and a bottom colloid 35 may be provided in addition to the first colloid 32, the second colloid 32, and the third colloid 33. The third colloid 33 may be integrally connected to any one of the first colloid 34, the second colloid 32, the fourth colloid 34, and the bottom colloid 35 in pairs.

[0073] like Figure 10 As shown, the end plate 22 includes a first plate portion 221 and a second plate portion 222 that are arranged opposite to each other and spaced apart along the second direction. A plurality of reinforcing ribs 223 are provided between the first plate portion 221 and the second plate portion 222 to divide the first channel into a plurality of sub-cavities. At least two sub-cavities are connected. The first colloid is located in the plurality of sub-cavities. The first plate portion 221 can be attached to the battery cell assembly 21. The second plate portion 222 is provided with a third opening 203.

[0074] The energy storage device of this disclosure reduces the bending deformation of the end plate 22 under the expansion force of the battery cell assembly 21 or external impact by providing a plurality of reinforcing ribs 223 in the end plate 22. This not only strengthens the structural strength of the end plate 22, but also achieves the purpose of lightweighting the energy storage device.

[0075] Furthermore, by connecting at least two compartments, the number of dispensing heads required during dispensing can be reduced, ensuring the consistency of the initial dispensing height.

[0076] Optionally, the end plate 22 can be formed by stamping or casting to create a first plate portion 221, a reinforcing rib, and a second plate portion 222. For example, the end plate 22 can be made of extruded aluminum profile, and each reinforcing rib portion 223 can extend along the height direction of the energy storage device. Furthermore, multiple cavities can be connected by providing first channels on the reinforcing ribs, ensuring the flatness of the upper surface of the first adhesive formed inside the end plate 22 during glue filling.

[0077] like Figures 5 to 7 As shown, the energy storage device in this embodiment of the present disclosure also includes a tab bracket 4. The tab bracket 4 includes a bracket body 41 and a buckle 42 connected to both ends of the bracket body 41 in a second direction. The bracket body 41 is disposed on one end of the cell assembly 21 facing the assembly port 12. The buckle 42 is snapped into the third opening 203, and the buckle 42 and the third opening 203 are in clearance fit. The buckle 42 is bonded to the end plate 22 through the adhesive structure layer 3.

[0078] The energy storage device of this embodiment utilizes a snap-fit ​​mechanism (SMR) to engage the tab bracket 4 within the third opening 203. This third opening 203 not only serves to prevent adhesive leakage during assembly but also secures the tab bracket 4, increasing the overall structural stability. Furthermore, the snap-fit ​​42 is bonded to the end plate 22 via the adhesive layer 3, preventing the tab bracket 4 from wobbling under impact. This further prevents cracking of the solder joints between the electrode post and the busbar. Therefore, the reliability and durability of the energy storage device structure are significantly improved.

[0079] like Figure 9 As shown, the bottom wall of the lower housing 1 has a boss 13, and the end plate 22 abuts against the boss 13. The boss 13 of the lower housing 1 abuts against the end plate 22, providing positioning and support for the end plate 22. This prevents the bottom of the battery module 2 from directly contacting the inner wall of the battery box cavity, thus avoiding excessive compression of the bottom adhesive 35 and resulting in low bottom connection strength. In other words, it helps to form a bottom adhesive 35 of a certain thickness, which helps to increase the connection strength of the bottom area.

[0080] like Figure 4 , Figure 5 and Figure 8 As shown, the battery module 2 also includes side plates 23 disposed opposite to each other on both sides in the third direction. The cell assembly 21 includes a plurality of cells arranged sequentially in the receiving cavity 11 along the second direction. The side plates 23 are connected to the end plates 22 at both ends in the second direction. The third direction, the first direction and the second direction are perpendicular to each other.

[0081] The energy storage device of this embodiment can provide circumferential all-round protection for the battery cell assembly 21 by setting the side plate 23 and connecting it to the end, thereby helping to increase the overall structural strength of the battery module 2.

[0082] Specifically, the two end plates 22 and the two side plates 23 are connected end-to-end. For example, a rectangular frame can be formed.

[0083] like Figure 4 , Figure 5 and Figure 11 As shown, the side plate 23 includes a side plate body 231 and a first side plate fold 232. The first side plate fold 232 is connected to the end of the side plate body 231 that is away from the assembly port 12 in a first direction. The side plate body 231 abuts against the battery cell assembly 21 and is in contact with the side wall surface of multiple battery cells.

[0084] The energy storage device of this embodiment divides the side plate 23 into a side plate body 231 and a first side plate flange 232, and connects the first side plate flange 232 to the lower end of the side plate body 231. This increases the constraint on the lower end of the cell assembly 21, providing vertical constraint force to the cell assembly 21 and helping to maintain the stability of the stacked structure. Furthermore, the first side plate flange 232 increases the cross-sectional area of ​​the side plate 23 in the thickness direction, thereby improving bending stiffness and helping to reduce the lateral deformation of the side plate 23 under cell expansion force or external impact.

[0085] Optionally, the first side plate flange 232 bends inward (towards the cell assembly 21) from the lower end of the side plate body 231, forming a partial covering structure for the cell assembly 21. Therefore, the energy storage device of this embodiment has the advantages of good structural integrity and ease of processing.

[0086] like Figure 11 As shown, the side plate 23 also includes a second side plate folded edge 233, which is connected to the end of the side plate body 231 facing the assembly port 12 in the first direction. The second side plate folded edge 233 is disposed opposite to the end of the battery cell assembly 21 facing the assembly port 12. That is, the first side plate folded edge 232 and the second side plate folded edge 233 are disposed opposite to each other at both ends of the side plate body 231 along the height direction of the energy storage device.

[0087] The energy storage device of this embodiment features a first side plate flange 232 and a second side plate flange 233 at both ends of the side plate 231. These two flanges form a positioning reference for the battery module 2 on the lower housing 1, facilitating precise module alignment and reducing assembly errors. Furthermore, the two flanges also provide height-direction limits and constraints on the cell assembly 21, thereby further enhancing the stability of the energy storage device.

[0088] like Figure 1 and Figure 8As shown, the colloidal structure layer 3 also includes a bottom colloidal layer 35, with a gap between the first side plate folds 232 of the two side plates 23, a portion of the bottom colloidal layer 35 is bonded to the first side plate folds 232, and / or another portion of the bottom colloidal layer 35 is bonded to the wall surface of the cell assembly 21 at the end away from the assembly port 12.

[0089] The energy storage device of this embodiment can fill the space between the first side plate fold 232 and the lower housing 1 by adding a bottom adhesive 35, forming an "overlapping + covering" type of adhesion, which significantly improves the shear and peel strength. Furthermore, the bottom adhesive 35 can be a coating adhesive layer formed on the bottom of the cell assembly 21.

[0090] like Figure 8 As shown, the colloidal structure layer 3 also includes a side colloidal layer 36. The outer side of the side plate 231 has a fin assembly extending along the second direction. The side colloidal layer 36 is bonded to a portion of the fin assembly near the bottom wall of the lower housing 1. The end face of the side colloidal layer 36 facing the assembly port 12 is arranged in a smooth curve, and / or the height of the side colloidal layer 36 in the first direction first decreases and then increases.

[0091] The energy storage device of this embodiment increases the heat dissipation area of ​​the side plate 231 by providing fins on the outer side of the side plate 231, thereby improving the overall heat dissipation capacity of the battery module 2. Furthermore, the side adhesive 36 is formed on a portion of the fins near the bottom wall of the lower housing 1, and the end face of the side adhesive 36 facing the assembly port 12 is arranged in a smooth curve. The height of the side adhesive 36 first decreases and then increases in the first direction, which helps to increase the robustness of the connection between the battery module 2 and the lower housing 1 without affecting heat dissipation.

[0092] like Figure 7 , Figure 8 and Figure 11 As shown, the fin includes a first fin 234 and a plurality of second fins 235. The first fin 234 is located on the bottom wall closest to the lower housing 1 and has an inclined surface extending outward from the bottom wall to the mounting opening 12.

[0093] The energy storage device of this disclosure forms an inclined surface on the fin (first fin 234) closest to the bottom wall of the lower housing 1. This inclined surface can provide a guide surface when the battery module 2 is installed in the housing. On the other hand, the inclined surface of the fin also helps to fill the area below the fin with the injected adhesive before entering the fin area, which helps to reduce the adhesion of the adhesive to the fin area.

[0094] like Figure 8 As shown, the end plate 22 has a second opening 202 at the other end in the first direction that communicates with the first channel, and the height of the second opening 202 is lower than the height of the first fin 234.

[0095] The energy storage device of this embodiment sets the height of the second opening 202 to be lower than the height of the fin closest to the bottom wall of the lower housing 1, so that during glue filling, the glue liquid can flow smoothly from the gap between the end plate 22 and the lower housing 1 into the lower area of ​​the side plate 23 without being blocked by the fin.

[0096] The electrical equipment according to embodiments of this disclosure includes an energy storage device according to any one of the above.

[0097] The electrical equipment disclosed in this embodiment has the advantages of reducing wire bonding failure in the top area of ​​the energy storage device and improving the mechanical reliability and durability of the energy storage device.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0099] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0101] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0102] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0103] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0104] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An energy storage device, characterized in that, include: The lower housing has a receiving cavity, and one end of the lower housing in a first direction has an assembly port communicating with the receiving cavity; A battery module, wherein the battery module is disposed within the receiving cavity, and the battery module includes a cell assembly and end plates disposed on both sides of the cell assembly in a second direction; The end plate is provided with a first channel extending along the first direction, and the end plate is provided with a first opening on the side of the end plate facing the assembly port in the first direction, and the first opening communicates with the first channel. The end plate has a third opening that connects to the first channel. In the second direction, the third opening is located on the outer wall of the end plate on the side away from the cell assembly, and the third opening is located at the end close to the first opening in the first direction. There is a gap between the lower housing and the end plate. The colloidal structure layer includes a first colloidal body and a second colloidal body that are interconnected. The first colloidal body is disposed in the first channel, and the second colloidal body extends from the third opening into the gap in a direction away from the assembly opening. The second colloidal body is bonded to the end plate and the side wall of the lower housing.

2. The energy storage device according to claim 1, characterized in that, In the first direction, the end plate has a second opening on the other end face away from the first opening, which communicates with the first channel; The colloidal structure layer also includes a third colloidal material located within the gap. The third colloidal material extends through the second opening toward the assembly port. The third colloidal material is located on the side of the second colloidal material away from the assembly port. The third colloidal material is bonded to the end plate and the side wall of the lower housing.

3. The energy storage device according to claim 2, characterized in that, The end plate is provided with a second channel extending along the first direction. The second channel is spaced apart from the first channel. The end plate is provided with a fourth opening on one side of the end face facing the assembly port in the first direction and a fifth opening on the other side of the end face. Both the fourth opening and the fifth opening are connected to the second channel. The colloidal structure layer further includes a fourth colloidal body, which extends into the gap through the fourth opening and is connected to the third colloidal body. The fourth colloidal body and the second colloidal body are spaced apart in a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other. And / or, the second colloid is provided in a strip-like extended form; And / or, the second colloid connects to the third colloid; And / or, the fourth colloid is extended in a strip shape, and the fourth colloid is connected to the third colloid; And / or, the colloidal structure layer further includes a bottom adhesive, which is disposed on the side of the cell assembly opposite to the assembly port, and the bottom adhesive is bonded between the bottom of the cell assembly and the bottom wall of the lower casing.

4. The energy storage device according to claim 2, characterized in that, The end plate includes a first plate portion and a second plate portion that are arranged opposite to each other and spaced apart along the second direction. A plurality of reinforcing ribs are provided between the first plate portion and the second plate portion to divide the first channel into a plurality of sub-cavities. At least two of the sub-cavities are connected. The first colloid is located in the plurality of sub-cavities. The first plate portion is attached to the battery cell assembly. The second plate portion is provided with the third opening.

5. The energy storage device according to claim 1, characterized in that, It also includes a tab bracket, which includes a bracket body and buckles connected to both ends of the bracket body in a second direction. The bracket body is disposed on the end of the cell assembly facing the assembly port. The buckles are engaged in the third opening, and the buckles are clearance-fitted with the third opening. The buckles are bonded to the end plate through the adhesive structure layer. And / or, the bottom wall surface of the lower housing has a boss, and the end plate abuts against the boss.

6. The energy storage device according to claim 1, characterized in that, The battery module also includes side plates disposed opposite to each other on both sides in a third direction. The cell assembly includes multiple cells arranged sequentially in the receiving cavity along a second direction. The side plates are fixedly connected to the end plates at both ends in the second direction. The third direction, the first direction, and the second direction are perpendicular to each other.

7. The energy storage device according to claim 6, characterized in that, The side plate includes a side plate body and a first side plate folded edge. The first side plate folded edge is connected to the end of the side plate body away from the assembly port in the first direction. The side plate body abuts against the battery cell assembly and is in contact with the side wall surfaces of the plurality of battery cells.

8. The energy storage device according to claim 7, characterized in that, The side plate also includes a second side plate folded edge, which is connected to one end of the side plate body facing the assembly port in the first direction, and the second side plate folded edge is disposed opposite to the end of the battery cell assembly facing the assembly port; And / or, the colloidal structure layer further includes a bottom colloid, with a gap between the first side plate folds of the two side plates, a portion of the bottom colloid is bonded to the first side plate fold, and / or another portion of the bottom colloid is bonded to the wall surface on the side of the cell assembly facing the bottom wall of the lower housing; And / or, the colloidal structure layer further includes a side colloidal layer, the outer side of the side plate having a fin assembly extending along the second direction, the side colloidal layer being bonded to a portion of the fin assembly near the bottom wall of the lower housing, the side colloidal layer having a smooth curve on the end face facing the assembly port, and / or the height of the side colloidal layer in the first direction first decreasing and then increasing.

9. The energy storage device according to claim 8, characterized in that, The fin includes a first fin and a plurality of second fins. The first fin is located on the bottom wall closest to the lower housing and has an inclined surface that extends outward from the bottom wall to the assembly opening. And / or, the end plate has a second opening at the other end in the first direction that communicates with the first channel, the height of the second opening being lower than the height of the first fin.

10. An electrical appliance, characterized in that, Includes the energy storage device according to any one of claims 1-9.

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