Battery pack and electrical equipment

Abstract

The present application provides a battery pack and electrical equipment, including a shell, a battery cell, an adapter and a seal, wherein a plurality of battery cells are provided and are all located in the shell; the adapter is connected to the tab of the battery cell; the seal is used to seal the adapter and the tab, and the seal is provided with grooves and / or holes. The seal that seals the adapter and the tab is formed by solidifying the colloid, and in the process of solidifying the colloid into the seal, a detachable mold or a non-detachable mold is provided to form grooves and / or holes in the seal. With such a setting, on the basis of ensuring the sealing requirements of the adhesive layer to the adapter, by forming grooves and / or holes in the seal, the amount of colloid used can be reduced under the premise of keeping the thickness of the adhesive layer unchanged. That is to say, while ensuring the sealing level requirements of the colloid to the adapter, the amount of colloid used can be reduced, thereby reducing the weight of the seal, and then reducing the weight of the battery pack, so as to achieve the purpose of reducing the weight of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] With the rapid development of battery technology, battery packs are needed in more and more fields. Battery packs provide electrical energy for the normal operation of electrical equipment. How to reduce the weight of the battery pack while ensuring that the battery pack meets normal usage functions is an urgent problem that technical personnel in this field need to solve. Summary of the Invention

[0003] In view of this, the present application provides a battery pack to solve the problem of heavy battery packs. The present application also provides an electrical device including the battery pack.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A battery pack, comprising:

[0006] case;

[0007] There are multiple battery cells, all of which are located in the housing;

[0008] An adapter, connected to the tab of the battery cell;

[0009] A sealing member seals the adapter and the tab, wherein the sealing member is provided with a hole and / or a groove.

[0010] Optionally, the sealing member is provided with a fixing groove for accommodating and fixing the tab, the groove is not connected to the fixing groove, and / or the hole is not connected to the fixing groove.

[0011] Optionally, the battery pack further includes a glue filling cover, which is connected to the adapter and receives a sealant that seals the adapter and the tab.

[0012] Optionally, the sealing member wraps the head of the tab and the adapter, and the sealing member is in contact with the glue potting cover near a surface of the glue potting cover.

[0013] Optionally, the sealing member is formed by curing foam glue or potting glue.

[0014] Optionally, a weight-reducing portion is provided on the side of the glue filling cover protruding toward the battery core, and the density of the weight-reducing portion is less than the density of the seal; and / or a weight-reducing part is provided on the side of the glue filling cover toward the battery core, and the density of the weight-reducing part is less than the density of the seal.

[0015] Optionally, the weight-reducing member is a hollow tube.

[0016] Optionally, the sealing member is arranged around the weight-reducing member to form the groove.

[0017] Optionally, the weight-reducing portion is an annular protrusion integrally formed with the glue-filling cover.

[0018] Optionally, the sealing member is arranged around the weight-reducing portion and forms the hole.

[0019] Optional,

[0020] The hole and the groove are not connected;

[0021] and / or, the extending length of the groove is greater than the extending length of the hole;

[0022] and / or, in the thickness direction of the sealing member, the depth of the hole is greater than the depth of the groove;

[0023] And / or, the extending direction of the groove is parallel to the extending direction of the hole.

[0024] Optionally, at least some of the multiple battery cells are stacked, the weight-reducing portion is arranged between the pole tabs of adjacent battery cells, and / or the weight-reducing member is arranged between the pole tabs of adjacent battery cells.

[0025] Optionally, in a direction perpendicular to the length direction of the weight-reducing member, the cross section of the weight-reducing member is trapezoidal, and the side length of the cross section close to the glue potting cover is smaller than the side length away from the glue potting cover.

[0026] Optionally, a limiting member for limiting the distance between the weight reducing member and the adapter is provided on a side of the weight reducing member close to the adapter.

[0027] Optionally, in the height direction of the battery core, the height of the limiting member is H, where H satisfies: 2mm≤H≤10mm.

[0028] Optionally, when the battery pack is inverted and the seal is formed, in the vertical direction, the top of the seal is higher than the top seal edge of the battery cell, and the top of the seal is lower than the top of the weight-reducing part, and the top of the seal is higher than or equal to the top of the weight-reducing part.

[0029] Optionally, the height of the seal is higher than the dimension h of the top sealing edge of the battery cell, where h satisfies: 1mm≤h≤7mm.

[0030] Optionally, a glue filling hole is provided on one end of the side wall of the shell close to the glue filling cover.

[0031] Optionally, a plurality of exhaust holes are provided on the adapter.

[0032] Optionally, the glue filling cover is provided with a buckle that is engaged with the edge of the adapter.

[0033] An electrical device comprising the battery pack described in any one of the above items.

[0034] The battery pack provided in the present application forms a seal for sealing the adapter and the tab by solidifying the colloid, and in the process of solidifying the colloid into the seal, a detachable mold or a non-detachable mold is provided to form grooves and / or holes in the seal. Among them, the tab and the adapter need to be sealed by a seal, and the sealing is to prevent corrosive liquids or dust from entering the adapter plate and the battery cell from above the battery pack, to avoid corrosion of the tab and the adapter, and to avoid affecting the sampling function of the adapter. With such a setting, on the basis of ensuring the sealing requirements of the glue layer to the adapter, by forming grooves and / or holes in the seal, the amount of colloid can be reduced under the premise of keeping the thickness of the glue layer unchanged. That is to say, while ensuring the sealing level requirements of the colloid to the adapter, the amount of colloid can be reduced, thereby reducing the weight of the seal, and then reducing the weight of the battery pack, so as to achieve the purpose of reducing the weight of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0036] Figure 1 This is a schematic diagram of the structure of the battery cell, adapter and glue potting cover provided in this embodiment.

[0037] Figure 2 This is a top view of the glue potting cover.

[0038] Figure 3 This is a structural diagram of the glue filling cover.

[0039] Figure 4 This is a side view of the battery cell, adapter and potting cover.

[0040] Figure 5 This is an exploded view of the battery cell, adapter and filling cover before filling.

[0041] Figure 6 This is an exploded view of the battery cell and adapter.

[0042] Figure 7 This is an exploded view of the battery cell, sealant and filling cover after filling.

[0043] Figure 8 Schematic diagram of the structure of the glue filling cover and glue layer.

[0044] Figure 9 Schematic diagram of the seal structure.

[0045] Figure 10 for Figure 4 Enlarged view of point M in the middle.

[0046] Figures 1-10 middle:

[0047] 1-battery cell, 2-adapter, 3-seal, 4-glue potting cover, 5-weight reduction component;

[0048] 11-top sealing edge, 21-exhaust hole, 31-hole, 32-groove, 33-fixing groove, 41-weight reduction part, 42-clip. DETAILED DESCRIPTION

[0049] The present application provides a battery pack and an electrical device including the battery pack.

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] like Figures 1-10 As shown, an embodiment of the present application provides a battery pack, which is used to be installed on an electrical device to provide power to the electrical device. The battery pack mainly includes a housing (not shown in the figure), a battery cell 1, an adapter 2, and a seal 3. Among them, the shell is used to provide a storage space for components such as the battery cell 1, adapter 2 and seal 3 of the battery pack; there are multiple battery cells 1, and all are located in the shell, and the battery cell 1 is formed by winding or stacking a positive electrode sheet, a negative electrode sheet and a diaphragm arranged between the positive electrode sheet and the negative electrode sheet, and the connection relationship between the multiple battery cells 1 is not limited here. For example, the multiple battery cells 1 can be connected in series, or in parallel, or some battery cells 1 can be connected in series and some battery cells 1 can be connected in parallel; the adapter 2 is connected to the tab of the battery cell 1. Specifically, the adapter 2 includes a connection end connected to the tab of the battery cell 1 and a connection end connected to the BMS board of the battery pack. The adapter 2 is used to transfer the voltage information of the battery cell 1 to the BMS board, so as to realize the detection of the voltage in multiple battery cells 1; the seal 3 is used to seal the adapter 2 and the tab, and the seal 3 is usually formed by solidifying an insulating colloid.

[0052] Specifically, the seal 3 is provided with a groove 32 and / or a hole 31. In this embodiment, an optional implementation is provided, in which a glue pouring cover 4 for carrying the colloid is provided, the glue pouring cover 4 is connected to the adapter 2, and a weight-reducing structure is provided at the position where the colloid forms the seal 3. In the process of pouring the colloid into the battery pack to form the seal 3, the weight-reducing structure can occupy the glue pouring space of the colloid, thereby forming the hole 31 and / or the groove 32 in the seal 3. It should be noted that, under this setting, the glue pouring cover 4 is not demolded after the glue injection is completed, that is, the glue pouring cover 4 is bonded to the seal 3; and as for the weight-reducing structure, the weight-reducing structure can be demolded, and of course the density of the weight-reducing structure can be set to a material that is less than the density of the colloid, which can also achieve the effect of reducing the weight of the battery pack. Another optional implementation is also provided in this embodiment, in which a mold for carrying the colloid is provided (not shown in the figure). The mold includes at least a carrying mold for carrying the colloid, and a weight-reducing mold for forming the holes 31 and / or grooves 32 of the seal 3. In order to facilitate demolding of the mold, a release agent can be coated on the above-mentioned mold. In the process of pouring the colloid into the battery pack to form the seal 3, after waiting for the colloid to solidify to form the seal 3, the above-mentioned carrying mold and weight-reducing mold are removed to form the seal 3 with the holes 31 and / or grooves 32.

[0053] It should be emphasized that the battery pack in the present application is preferably a battery pack installed in an aircraft, that is, the battery pack in the present application is applied to the field of aircraft. Here, aircraft refers to a mechanical flying object manufactured by humans, which can fly off the ground and fly in the atmosphere or outside the atmosphere. For example, the aircraft can be a manned aircraft, a drone, a spacecraft, a satellite, an aircraft, a rocket, a missile, etc. Since the above-mentioned battery pack is installed in an aircraft, in the field of aircraft, it is necessary to reduce the weight of the aircraft as much as possible while ensuring the flight safety of the aircraft. Reducing the weight of the aircraft in the field of aircraft is a difficult problem that those skilled in the art urgently need to overcome. The battery pack installed on the aircraft in the present application reduces the weight of the aircraft by reducing the weight of the battery pack, so as to improve the performance of the aircraft in many aspects, such as improving the carrying capacity of the aircraft, increasing the flight mileage of the aircraft, increasing the flight speed of the aircraft, improving the maneuverability of the aircraft, reducing energy consumption and saving costs, etc.

[0054] It should also be noted that the adapter 2 can be a PCB board or an FPC board.

[0055] In the battery pack of the above structure, the seal adapter 2 and the tab seal 3 are formed by curing the colloid. During the curing process of the colloid into the seal 3, a removable or non-removable mold is provided to form a groove 32 and / or a hole 31 in the seal 3. This arrangement, while ensuring the sealing performance requirements of the adhesive layer to the adapter 2, can reduce the amount of colloid used by forming the groove 32 and / or the hole 31 in the seal 3 without changing the thickness of the adhesive layer. In other words, while ensuring the sealing level requirements of the colloid to the adapter 2, the amount of colloid used is reduced, thereby reducing the weight of the seal 3 and, in turn, the weight of the battery pack, thereby achieving the purpose of reducing the weight of the battery pack.

[0056] In some embodiments, see Figure 8 and Figure 9 The seal 3 is provided with a fixing groove 33 for accommodating and fixing the tab. Specifically, the seal 3 is usually made of solidified colloid, and the fixing groove 33 is fitted with the tab. The fixing groove 33 of the seal 3 can facilitate the fixation of the tab, further prevent the tab from displacement, and thus improve the fixing effect of the tab.

[0057] Furthermore, if the fixing groove 33 is connected to the groove 32, or the fixing groove 33 is connected to the hole 31, the contact area between the seal 3 and the tab will be reduced, thereby affecting the seal 3's ability to fix the tab, and ultimately affecting the sealing effect of the seal 3. Therefore, in this embodiment, the groove 32 is not connected to the fixing groove 33, and / or the hole 31 is not connected to the fixing groove 33, which can improve the sealing effect of the seal 3 on the adapter 2 and the tab.

[0058] In some embodiments, see Figures 1 to 8 The battery pack also includes a glue filling cover 4, which is connected to the adapter 2 and can receive the seal 3 of the sealing adapter 2 and the tab. Specifically, when glue is poured into the glue filling cover 4 to form the sealing adapter 2 and the tab seal 3, the glue filling cover 4 and the seal 3 are bonded together. Compared with the above-mentioned embodiment of demolding the mold after glue filling is completed, the embodiment of providing the glue filling cover 4 can reduce the subsequent demolding process, improve the efficiency of glue filling to form the seal 3, and improve the assembly efficiency of the battery pack. Moreover, by providing the glue filling cover 4, support can be provided for the sealed adapter 2 and seal 3, thereby improving the stability of their structure.

[0059] In some embodiments, see Figure 8 , the seal 3 wraps the head of the tab and the adapter 2, and the surface of the seal 3 close to the potting cover 4 abuts against the potting cover 4. In other words, a seal 3 is provided between the tab and the potting cover 4, and a seal 3 is also provided between the adapter 2 and the potting cover 4, so that the seal 3 wraps the tab head and the adapter 2, thereby improving the sealing effect of the seal 3 on the tab and the adapter 2.

[0060] It should be noted that the seal 3 wraps the head of the tab and the adapter 2, which means that the head of the tab and the adapter 2 are both located inside the seal 3. Correspondingly, the head of the tab refers to the bent portion of the tab.

[0061] In some embodiments, the sealing member 3 is formed by solidifying a foaming adhesive or a potting adhesive, so as to improve the sealing effect of the solidified sealing member 3 on the adapter 2 and the tab, and enhance the stability of the structure.

[0062] It should be noted that foam glue refers to a product that combines aerosol technology and polyurethane foam technology, and potting glue is a liquid material used for bonding, sealing, potting and coating protection of electronic components.

[0063] In some embodiments, see Figures 3 to 7 The side of the glue potting cover 4 facing the battery cell 1 is protruded with a weight-reducing portion 41 that blocks the groove 32 and / or hole 31 of the seal 3. That is, during the process of pouring glue into the glue potting cover 4 and solidifying the glue to form the seal 3 that seals the adapter 2 and the tab, the weight-reducing portion 41 is provided on the side of the glue potting cover 4 facing the battery cell 1 before glue potting. The weight-reducing portion 41 can occupy part of the glue potting space, so that the seal 3 after the glue is solidified forms the groove 32 and / or hole 31, and the density of the weight-reducing portion 41 is ensured to be less than that of the seal 3. Compared with the solution without the weight-reducing portion 5, this arrangement can reduce the weight of the seal 3, thereby reducing the weight of the battery pack.

[0064] In some embodiments, see Figures 8 and 9 A weight-reducing member 5 is provided on the side of the glue-filling cover 4 facing the battery cell 1 to block the groove 32 and / or hole 31 of the seal 3. That is, during the process of pouring glue into the glue-filling cover 4 and solidifying the glue to form the seal 3 that seals the adapter 2 and the tab, the weight-reducing member 5 is provided on the side of the glue-filling cover 4 facing the battery cell 1 before glue pouring. The weight-reducing member 5 can occupy part of the glue-filling space, so that the seal 3 after the glue solidifies forms the groove 32 and / or hole 31, and ensures that the density of the weight-reducing member 5 is lower than that of the seal 3. Compared with a solution without the weight-reducing member 5, this arrangement can reduce the weight of the seal 3, thereby reducing the weight of the battery pack.

[0065] It should be noted that the arrangement of the weight-reducing portion 41 and the weight-reducing member 5 is not limited herein. Only the weight-reducing portion 41 may be provided; only the weight-reducing member 5 may be provided; or both the weight-reducing portion 41 and the weight-reducing member 5 may be provided. Furthermore, there is no limitation on the number of weight-reducing portions 41 and weight-reducing members 5 provided. One or more weight-reducing portions 41 and weight-reducing members 5 may be provided.

[0066] In some embodiments, see Figure 4The weight-reducing member 5 is configured as a hollow tube. This configuration can further reduce the weight of the weight-reducing member 5, further reduce the weight of the battery pack, and enhance the weight-reducing effect on the battery pack.

[0067] It should be noted that, here, it is sufficient to ensure that the density of the weight-reducing member 5 is less than that of the sealant 3 after the colloid is cured, so that the weight of the battery pack can be reduced. For example, the weight-reducing member 5 can also be a lightweight structure such as a foam tube or a foam tube.

[0068] In some embodiments, see Figure 8 The sealing member 3 is disposed around the weight-reducing member 5 and forms a groove 32. In other words, the weight-reducing member 5 is filled in the groove 32. As can be seen from the above embodiment, the sealing member 3 is formed by solidifying the foam glue or potting glue. After the foam glue or potting glue is solidified into the sealing member 3, the sealing member 3 will be bonded to the weight-reducing member 5. This can ensure the sealing effect of the sealing member 3 while reducing the weight of the sealing member 3.

[0069] In some embodiments, see Figure 3 The weight-reducing portion 41 is provided as an annular protrusion integrally formed with the glue filling cover 4. In other words, the weight-reducing portion 41 is a hollow protrusion, which can further reduce the weight of the battery pack compared to a solid protrusion, further improving the weight-reducing effect. In addition, the integral formation of the weight-reducing portion 41 and the glue filling cover 4 can improve the structural stability of the weight-reducing portion 41 and prevent the weight-reducing portion 41 from shaking during the glue filling process.

[0070] It should be noted that, here, it is sufficient to ensure that the density of the weight-reducing portion 41 is less than that of the sealant 3 after the colloid is cured, so that the weight of the battery pack can be reduced. In addition, the weight-reducing portion 41 and the glue filling cover 4 can also be in other forms, for example, the weight-reducing portion 41 and the glue filling cover 4 are separately provided, and the weight-reducing portion 41 and the glue filling cover 4 are connected together by bonding, clamping, etc.

[0071] In some embodiments, see Figure 8 and Figure 9 The seal 3 is arranged around the weight-reducing portion 41 and forms a hole 31. In other words, the seal 3 is formed by solidifying the foam glue or potting glue, and the weight-reducing portion 41 is partially filled in the foam glue or potting glue. After the foam glue or potting glue is solidified into the seal 3, the seal 3 and the weight-reducing portion 41 are bonded together, and the weight-reducing portion 41 is part of the potting cover 4 or connected to the potting cover 4. In this way, the tightness of the bonding between the seal 3 and the potting cover 4 is improved, the stability of the structure of the seal 3 and the potting cover 4 is improved, and the weight of the seal 3 can be reduced while ensuring the sealing effect of the seal 3.

[0072] In some embodiments, see Figure 8If the hole 31 and the groove 32 were connected, the amount of colloid filling in this location would be less, resulting in a thinner and lighter seal 3 at this location. This would result in poor structural stability of the seal 3 and the possibility of breakage of the seal 3 at this location during the inevitable shaking of the assembled battery pack. Therefore, in this embodiment, the hole 31 and the groove 32 are kept separate. This improves the structural stability of the seal 3 at this location and enhances the sealing effect of the seal 3 on the tab and adapter 2.

[0073] In some embodiments, see Figure 8 The extending length of the groove 32 is greater than the extending length of the hole 31. Specifically, in the thickness direction of the seal 3, because the hole 31 penetrates the seal, the structural strength of the region of the seal 3 where the hole 31 is provided is lower than the region of the seal 3 where the groove 32 is provided. Therefore, ensuring that the length of the groove 32 is greater than the length of the hole 31 further reduces the weight of the seal 3 while maintaining the structural strength of the seal 3.

[0074] In some embodiments, see Figure 8 In the thickness direction of the seal 3, the depth of the hole 31 is greater than the depth of the groove 32. Since the hole 31 penetrates the seal 3 in the thickness direction of the seal 3, while the groove 32 does not, the provision of the hole 31 can further reduce the weight of the seal 3 compared to the provision of the groove 32.

[0075] It should be noted that the thickness direction of the seal 3 refers to Figure 8 The direction indicated by the double-headed arrow Y.

[0076] In some embodiments, see Figure 8 The extending direction of the groove 32 is parallel to the extending direction of the hole 31. Compared with an arrangement in which the extending directions of the groove 32 and the hole 31 intersect, this arrangement of this embodiment can improve the rigidity of the seal 3. When the seal 3 is subjected to external force, the external force can be dispersed by various parts of the seal 3, preventing the seal 3 from breaking due to the inevitable vibration of the battery pack, thereby improving the structural strength of the seal 3.

[0077] Exemplarily, the extending direction of the groove 32 and the extending direction of the hole 31 are both the length direction of the sealing member 3 .

[0078] In some embodiments, see Figures 4 to 6At least some of the multiple battery cells 1 are stacked, the weight-reducing portions 41 are disposed between adjacent battery cells 1 , and / or the weight-reducing members 5 are disposed between adjacent battery cells 1 . Specifically, in the process of pouring glue into the battery pack to form the seal 3, first, the battery cells 1 are stacked together; then, a tab bracket is set to weld the positive tab and negative tab of the battery cell 1 and the adapter 2 together, and after the welding is completed, the tab bracket can be removed to further reduce the weight of the battery pack; then, the glue filling cover 4 and the adapter 2 are installed together, and the weight reduction part 5 is installed on the side of the glue filling cover 4 close to the battery cell 1; then, the assembled battery cell assembly is installed in the shell; then, the battery cell assembly installed in the shell is inverted as a whole, and glue is poured into the glue filling cover 4 through the glue filling holes located on the shell, so that the glue flows to the glue filling cover to seal the adapter 2 and the tabs of the battery cell 1; finally, after waiting for the glue to solidify into the seal 3, the shell and the battery cell 1 assembly are placed upright to complete the subsequent battery pack assembly steps. Since the top width of the tab of the battery cell 1 is smaller than the width of the battery cell 1, the gap at the top position between adjacent battery cells 1 is larger. Therefore, by arranging the weight-reducing portion 41 and / or the weight-reducing component 5 between adjacent battery cells 1, the arrangement of the weight-reducing portion 41 and / or the weight-reducing component 5 can be facilitated to make the internal layout of the battery pack more compact, and the weight-reducing portion 41 and / or the weight-reducing component 5 can occupy more glue filling space to enhance the weight-reducing effect of the seal 3 and further reduce the weight of the battery pack.

[0079] In some embodiments, see Figure 6 Taking the upright battery cell 1 as an example, curling will inevitably occur in the area near the tab at the top of the battery cell 1, resulting in a smaller distance between the two adjacent battery cells 1 at the area near the tab at the top of the battery cell 1. If the cross-section of the weight-reducing component 5 is a rectangular structure, the distance between the top of the hollow tube and the curling position of the battery cell 1 will be too small. In this way, during the process of pouring glue into the glue cap 4, bubbles may be generated at this position due to the small distance between the weight-reducing component 5 and the curling of the battery cell 1, affecting the molding effect of the seal 3. Therefore, in the direction perpendicular to the length of the weight-reducing component 5, the cross-section of the weight-reducing component 5 is trapezoidal, and the side length of the cross-section close to the glue cap 4 is smaller than the side length away from the glue cap 4. In this way, the distance between the weight-reducing component 5 and the curling of the battery cell 1 can be increased to avoid the formation of bubbles in the colloid during the glue pouring process, thereby improving the stability of the seal 3 formed by the solidification of the colloid and improving the sealing effect of the seal 3 on the adapter 2.

[0080] For example, the length direction of the weight-reducing member 5 is Figure 6 The direction indicated by the double-headed arrow A is perpendicular to the length direction of the weight-reducing member 5. Figure 6 The plane where arrows B and C are located.

[0081] In some embodiments, as can be seen from the above-mentioned glue filling process for the adapter 2, after the glue filling cover 4 and the adapter 2 are installed together, when the assembled battery cell 1 components and the glue filling cover 4 are in an upright position, the weight-reducing member 5 is inserted from the top area of ​​the battery cell 1 between adjacent battery cells 1, and then the above-mentioned assembled components are placed in the housing. After that, the above-mentioned components placed in the housing are inverted. At this time, the weight-reducing member 5 will move toward the glue filling cover 4 due to its own gravity and fit with the adapter 2. In this way, during the glue filling process, if the gap between the weight-reducing member 5 and the adapter 2 is too small, the glue will not be able to flow between the weight-reducing member 5 and the adapter 2, that is, it may cause bubbles to form between the weight-reducing member 5 and the adapter 2, resulting in a poor sealing effect of the glue on the adapter 2. Therefore, a limiter (not shown in the figure) is provided on the side of the weight-reducing member 5 close to the adapter 2 to limit the distance between the weight-reducing member 5 and the adapter 2. In this way, the colloid can fill the space between the adapter 2 and the weight-reducing member 5 during the glue pouring process, thereby improving the sealing effect of the adapter 2.

[0082] For example, the limiting member may be one or a combination of structures such as foam, hollow tube, or support blocks arranged at intervals.

[0083] In some embodiments, see Figure 6 The height of the stopper is H, along the height of the battery cell 1, where H satisfies the following conditions: 2mm≤H≤10mm. Maintaining the stopper's height within this range prevents it from being too small, thus preventing air bubbles from forming between the weight-reducing component 5 and the adapter 2 during the glue pouring process, thereby improving the sealing effect of the sealant 3 on the adapter 2. It also prevents the stopper from being too large, thus preventing the weight-reducing component 5 from occupying too little space during the glue pouring process, and thus preventing the battery pack from losing too little weight.

[0084] It should be noted that the height of the limiter refers to the height of the limiter at Figure 6 Dimensions in the direction indicated by the double-headed arrow B.

[0085] Exemplarily, the height of the limiting member can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0086] In some embodiments, when the battery pack is inverted and the seal 3 is formed, that is, the battery pack is in a glue-filled state and the glue is solidified into the seal 3, in the vertical direction, the top of the seal 3 is higher than the top seal 11 of the battery cell 1, so as to ensure the sealing requirements of the seal 3 on the adapter 2 and the tab, so as to ensure the sealing effect of the adapter 2 and the tab; and, it can be seen from the above embodiments that in order to improve the weight reduction effect of the battery pack, the weight reduction portion 41 is preferably set as an annular protrusion, that is, the top of the weight reduction portion 41 is an opening when the battery pack is inverted, thereby ensuring that the top of the seal 3 is lower than the top of the weight reduction portion 41, which can prevent the glue from flowing out from the opening position of the annular protrusion, thereby avoiding increasing the weight of the battery pack.

[0087] In addition, the top of the sealant 3 needs to be higher than or equal to the top of the weight-reducing part 5, that is, during the glue injection process, the colloid is completely submerged in the weight-reducing part 5 or the top surface of the colloid is flush with the top surface of the weight-reducing part 5. This can further reduce the amount of glue injection, so as to further reduce the weight of the battery pack while meeting the sealing requirements of the adapter 2.

[0088] It should be noted that the battery pack is in the upright position. Figure 1 The state shown is the state in which the glue filling cover 4 and the adapter 2 are located on the top of the battery cell 1; the state in which the battery pack is inverted (not shown in the figure) is the state in which the glue filling cover 4 and the adapter 2 are located at the bottom and the battery cell 1 is located at the top.

[0089] In some embodiments, the height of the seal 3 is measured above the top seal 11 of the battery cell 1 by a dimension h, where h satisfies the following: 1 mm ≤ h ≤ 7 mm (not shown). Ensuring that the height of the seal 3 exceeds the dimension of the top seal 11 within the above range prevents the seal 3 from failing to seal the top seal 11 of the battery cell 1, resulting in a low seal height that fails to meet the sealing requirements of the adapter 2. Furthermore, the seal 3 can be prevented from exceeding the top seal 11 by too much, which could result in excessive glue injection.

[0090] It should be noted that the height of the seal 3 refers to Figure 6 Dimensions in the direction indicated by the double-headed arrow B.

[0091] For example, the height of the sealing member 3 may be higher than the top sealing edge 11 by 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc.

[0092] In some embodiments, a glue hole (not shown) is defined in the side wall of the housing near one end of the glue filling cap 4. This arrangement allows the glue filling cap 4 to be filled with glue when the battery pack is in an inverted state. This reduces the distance the glue travels to the glue filling cap 4, preventing the glue from adhering to other parts of the battery pack, further reducing friction, and thus, to a certain extent, reducing the weight of the battery pack.

[0093] In some embodiments, see Figure 6 , an exhaust hole 21 is provided on the adapter 2. Specifically, the glue filling cover 4 is usually connected to the adapter 2. In order to make the layout of the battery pack more compact and reduce the amount of glue filling, the adapter 2 is usually fitted together with the wall of the glue filling cover 4. In the process of filling glue into the glue filling cover 4, since the adapter 2 and the glue filling cover 4 are too tightly fitted, the glue may not flow well to various positions between the adapter 2 and the glue filling cover 4. Here, by providing the exhaust hole 21 on the adapter 2, the glue can be made to flow between the adapter 2 and the glue filling cover 4 during the glue flow process, reducing or even avoiding the generation of bubbles between the adapter 2 and the glue filling cover 4, thereby improving the sealing effect of the glue on the adapter 2.

[0094] Furthermore, multiple exhaust holes 21 are opened on the adapter 2, and multiple exhaust holes 21 are opened evenly on the adapter 2, which can further reduce the bubbles between the adapter 2 and the glue filling cover 4, and further improve the sealing effect of the seal 3 on the adapter 2 after the colloid is cured.

[0095] In some embodiments, see Figure 3 The glue potting cover 4 is provided with a clip 42 that engages with the edge of the adapter 2, that is, the glue potting cover 4 and the adapter 2 are detachably connected by clipping. Here, by connecting the glue potting cover 4 and the adapter 2 in this manner, it is possible to prevent shaking between the glue potting cover 4 and the adapter 2 before the battery cell 1 assembly is inverted and glue is poured into the glue potting cover 4, thereby preventing the two from shifting, thereby improving the stability of their connection; moreover, by achieving the connection between the adapter 2 and the glue potting cover 4 through clipping, the clip 42 can play a positioning role, which can improve the installation efficiency of the glue potting cover 4.

[0096] In addition, the glue filling cover 4 can also be connected to the adapter 2 in other ways. For example, the glue filling cover 4 can also be connected to the adapter 2 by magnetic connection, bonding, bolt connection, etc.

[0097] An electric device includes any one of the above battery packs. Since the electric device includes the above battery pack, the beneficial effects of the electric device brought by the battery pack can be found in the above content and will not be repeated here.

[0098] It should be noted that the electrical equipment can be industrial electrical equipment, such as cranes, excavators and other construction machinery; the electrical equipment can also be household appliances, such as cleaning robots, refrigeration appliances and other household appliances; the electrical equipment can also be transportation vehicles, such as electric vehicles, hybrid vehicles, fuel vehicles and other transportation vehicles; of course, the electrical equipment can also be the aircraft mentioned above.

[0099] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0100] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0101] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0102] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0103] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0104] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery pack, characterized in that: include: case; There are multiple battery cells, all of which are located in the housing; An adapter, connected to the tab of the battery cell; A sealing member, sealing the adapter and the tab, the sealing member being provided with a hole and / or a groove; the sealing member being provided with a fixing groove for accommodating and fixing the tab, the groove being not connected to the fixing groove, and / or the hole being not connected to the fixing groove; A glue potting cover, the glue potting cover is connected to the adapter and receives the seal that seals the adapter and the tab; a weight-reducing member is provided on the side of the glue potting cover facing the battery cell, and the density of the weight-reducing member is less than the density of the seal; in a direction perpendicular to the length of the weight-reducing member, the cross-section of the weight-reducing member is trapezoidal, and the length of the side of the cross-section close to the glue potting cover is less than the length of the side away from the glue potting cover; a weight-reducing portion is provided on the side of the glue potting cover facing the battery cell; Among them, at least some of the multiple battery cells are stacked, the weight-reducing portion is arranged between the pole tabs of adjacent battery cells, and / or the weight-reducing member is arranged between the pole tabs of adjacent battery cells.

2. The battery pack according to claim 1, wherein: The sealing component wraps the head of the tab and the adapter, and the sealing component is close to the surface of the glue potting cover and abuts against the glue potting cover.

3. The battery pack according to claim 1, wherein: The sealing member is formed by solidifying foaming glue or potting glue.

4. The battery pack according to claim 1, wherein: The density of the weight-reducing portion is lower than the density of the sealing member.

5. The battery pack according to claim 4, characterized in that: The weight-reducing member is a hollow tube.

6. The battery pack according to claim 4, characterized in that: The sealing member is arranged around the weight-reducing member and forms the groove.

7. The battery pack according to claim 4 or 5, characterized in that: The weight-reducing portion is an annular protrusion integrally formed with the glue-filling cover.

8. The battery pack according to claim 7, characterized in that: The sealing member is disposed around the weight reduction portion and forms the hole.

9. The battery pack according to claim 8, characterized in that: The hole and the groove are not connected; and / or, the extending length of the groove is greater than the extending length of the hole; and / or, in the thickness direction of the sealing member, the depth of the hole is greater than the depth of the groove; And / or, the extending direction of the groove is parallel to the extending direction of the hole.

10. The battery pack according to claim 1 or 4, characterized in that: A limiting member for limiting the distance between the weight reducing member and the adapter is provided on a side of the weight reducing member close to the adapter.

11. The battery pack according to claim 10, characterized in that: In the height direction of the battery core, the height of the limiting member is H, where H satisfies: 2mm≤H≤10mm.

12. The battery pack according to claim 4, characterized in that: When the battery pack is inverted and the seal is formed, in the vertical direction, the top of the seal is higher than the top seal edge of the battery cell, and the top of the seal is lower than the top of the weight-reducing part, and the top of the seal is higher than or equal to the top of the weight-reducing part.

13. The battery pack according to claim 12, wherein: The height of the seal is higher than the dimension of the top sealing edge of the battery cell by h, wherein h satisfies: 1mm≤h≤7mm.

14. The battery pack according to claim 1, wherein: A glue filling hole is formed on one end of the side wall of the shell body close to the glue filling cover.

15. The battery pack according to claim 1, wherein: A plurality of exhaust holes are provided on the adapter.

16. The battery pack according to claim 1, wherein: The glue filling cover is provided with a buckle which is engaged with the edge of the adapter.

17. An electrical device, characterized in that: Comprising the battery pack according to any one of claims 1 to 16.

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