Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment, the battery pack comprises a shell, a plurality of battery cells, an adapter and a sealing element, and the battery cells are all located in the shell; the adapter is connected with a tab of the battery cell; the sealing piece is used for sealing the adapter piece and the tab; and the sealing piece is provided with a groove and / or a hole. The method comprises the following steps: forming a sealing element for sealing the adapter and the tab by curing the colloid, and forming a groove and / or a hole in the sealing element by arranging a detachable mold or a non-detachable mold in the process of curing the colloid into the sealing element. By means of the arrangement, on the basis that the requirement of the glue layer for the sealing performance of the adapter is guaranteed, the groove and / or the hole are / is formed in the sealing piece, the using amount of glue can be reduced on the premise that the thickness of the glue layer is not changed, in other words, the using amount of the glue is reduced on the premise that the requirement of the glue layer for the sealing grade of the adapter is guaranteed, and therefore the weight of the sealing piece is reduced; therefore, the weight of the battery pack is reduced, and the purpose of reducing the weight of the battery pack is achieved.

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. On the premise that the battery packs meet normal use functions, how to reduce the weight of the battery packs is an urgent problem that technicians 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 weight of the battery pack. 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: A battery pack, comprising: case; A plurality of battery cells are provided and all are located in the housing; A switching piece connected to the tab of the battery cell; A sealing member is used to seal the adapter and the tab, wherein the sealing member is provided with a hole and / or a groove.

[0005] Optionally, the sealing member is provided with a fixing groove for accommodating and fixing the pole ear, the groove is not connected to the fixing groove, and / or the hole is not connected to the fixing groove.

[0006] 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.

[0007] Optionally, the sealing component wraps the head of the tab and the adapter, and the sealing component abuts against the glue potting cover on a surface close to the glue potting cover.

[0008] Optionally, the sealing member is formed by curing foam glue or potting glue.

[0009] 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 lower than the density of the seal; and / or a weight-reducing component is provided on the side of the glue filling cover toward the battery core, and the density of the weight-reducing component is lower than the density of the seal.

[0010] Optionally, the weight-reducing member is a hollow tube.

[0011] Optionally, the sealing member is arranged around the weight-reducing member to form the groove.

[0012] Optionally, the weight-reducing portion is an annular protrusion integrally formed with the glue potting cover.

[0013] Optionally, the sealing member is arranged around the weight-reducing portion and forms the hole.

[0014] Optional, 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, an extension direction of the groove is parallel to an extension direction of the hole.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] Optionally, in the height direction of the battery core, the height of the limiting member is H, wherein H satisfies: 2mm≤H≤10mm.

[0019] 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.

[0020] Optionally, 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.

[0021] Optionally, a glue filling hole is formed on one end of the side wall of the shell near the glue filling cover.

[0022] Optionally, a plurality of exhaust holes are provided on the adapter.

[0023] Optionally, the glue filling cover is provided with a buckle that is engaged with the edge of the adapter.

[0024] An electrical device comprises a battery pack as described in any one of the above items.

[0025] 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 tabs 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 the top of the battery pack, to avoid corrosion of the tabs and the adapter, and to avoid affecting the sampling function of the adapter. With such a configuration, 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 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 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

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the battery cell, adapter and glue filling cover provided in this embodiment.

[0028] Figure 2 This is a top view of the glue potting cover.

[0029] Figure 3 This is a schematic diagram of the structure of the glue filling cover.

[0030] Figure 4 This is a side view of the battery cell, adapter and glue filling cover.

[0031] Figure 5 This is an exploded view of the battery cell, adapter and filling cover before filling.

[0032] Figure 6 This is an exploded view of the battery cell and adapter.

[0033] Figure 7 This is an exploded view of the battery cell, sealant and filling cover after filling with glue.

[0034] Figure 8 Schematic diagram of the structure of the glue filling cover and glue layer.

[0035] Fig. 9 A schematic diagram of the seal structure.

[0036] Fig.10 for Figure 4 Enlarged view of point M in the middle.

[0037] Figure 1-Figure 10 middle: 1-battery core, 2-adapter, 3-seal, 4-glue filling cover, 5-weight reduction part; 11-top sealing edge, 21-exhaust hole, 31-hole, 32-groove, 33-fixing groove, 41-weight reduction part, 42-buckle. DETAILED DESCRIPTION

[0038] The present application provides a battery pack and an electrical device including the battery pack.

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] like Figure 1-Figure 10 As shown, the embodiment of the present application provides a battery pack, which is used to be installed on an electrical device to provide electrical energy to the electrical device. The battery pack mainly includes a shell (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, the adapter 2 and the seal 3 of the battery pack; there are multiple battery cells 1, and all are located in the shell, 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. Exemplarily, 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 pole ear of the battery cell 1. Specifically, the adapter 2 includes a connecting end connected to the pole ear of the battery cell 1 and a connecting 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 the multiple battery cells 1; the seal 3 is used to seal the adapter 2 and the pole ear, and the seal 3 is usually formed by solidifying an insulating colloid.

[0041] 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 carrying the colloid is provided, the glue pouring cover 4 is connected to the adapter 2, and a weight reduction 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 reduction structure can occupy the glue pouring space of the colloid, so that the seal 3 forms the hole 31 and / or the groove 32. It should be noted that, under this setting mode, 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 for the weight reduction structure, the weight reduction structure can be demolded, and of course the density of the weight reduction structure can be set to a material less than the density of the colloid, which can also achieve the effect of reducing the weight of the battery pack. In this embodiment, another optional implementation is also provided, in which a mold for carrying the colloid is provided (not shown in the figure), the mold at least includes 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 the weight-reducing mold are removed to form the seal 3 with holes 31 and / or grooves 32.

[0042] 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, where the aircraft refers to a mechanical flying object manufactured by humans, capable of flying off the ground, and flying in the atmosphere or in the outer space of the atmosphere. Exemplarily, the aircraft can be a manned aircraft, a drone, a spacecraft, a satellite, an aircraft, a rocket, a missile, and the like. Since the above-mentioned battery pack is installed in an aircraft, in the field of aircraft, on the premise of ensuring the flight safety of the aircraft, it is necessary to reduce the weight of the aircraft as much as possible. Reducing the weight of the aircraft in the field of aircraft is a difficult problem that technicians in the field of aircraft 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.

[0043] It should also be noted that the adapter 2 can be a PCB board or an FPC board.

[0044] The battery pack of the above structure forms the sealing adapter 2 and the seal 3 of the tab by curing the colloid, and in the process of curing the colloid into the seal 3, a detachable mold or a non-detachable mold is provided to form a groove 32 and / or a hole 31 in the seal 3. In this way, on the basis of ensuring the sealing requirements of the adhesive layer to the adapter 2, by forming the groove 32 and / or the hole 31 in the seal 3, the amount of colloid can be reduced under the premise of keeping the thickness of the adhesive layer unchanged, that is, the amount of colloid can be reduced under the premise of ensuring the sealing level requirements of the colloid to the adapter 2, so as to reduce the weight of the seal 3, thereby reducing the weight of the battery pack, so as to achieve the purpose of reducing the weight of the battery pack.

[0045] In some embodiments, see Figure 8 and Fig. 9 The seal 3 is provided with a fixing groove 33 for accommodating and fixing the tab. Specifically, the seal 3 is usually formed by curing colloid, and the fixing groove 33 is fitted with the tab. The fixing groove 33 of the seal 3 can facilitate the fixing of the tab, further prevent the tab from displacement, and thus improve the fixing effect of the tab.

[0046] 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 effect of the seal 3 fixing the tab, and finally affecting the sealing effect of the seal 3. Therefore, further 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, so that the sealing effect of the seal 3 on the adapter 2 and the tab can be improved.

[0047] 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 the glue is poured into the glue filling cover 4 to form the seal 3 of the sealing adapter 2 and the tab, the glue filling cover 4 is bonded to the seal 3. Compared with the above-mentioned implementation method of demolding the mold after the glue filling is completed, the implementation method 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 the seal 3, thereby improving the stability of the structure.

[0048] 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 glue potting cover 4 abuts against the glue potting cover 4. In other words, a seal 3 is provided between the tab and the glue potting cover 4, and a seal 3 is also provided between the adapter 2 and the glue 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.

[0049] 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.

[0050] In some embodiments, the sealing member 3 is formed by curing a foaming glue or a potting glue, so as to improve the sealing effect of the cured sealing member 3 on the adapter 2 and the tab and improve the stability of the structure.

[0051] 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.

[0052] In some embodiments, see Figures 3 to 7 The glue filling cover 4 is provided with a weight-reducing part 41 protruding from one side of the glue filling cover 4 toward the battery cell 1, which blocks the groove 32 and / or hole 31 of the seal 3. That is to say, in the process of filling glue into the glue filling cover 4 and solidifying the glue into the seal 3 of the sealing adapter 2 and the tab, the weight-reducing part 41 is provided on the side of the glue filling cover 4 toward the battery cell 1 before filling glue. The weight-reducing part 41 can occupy part of the glue filling space, so that the seal 3 after the glue is solidified forms the groove 32 and / or hole 31, and it is ensured that the density of the weight-reducing part 41 is less than the density of the seal 3. Compared with the scheme without the weight-reducing part 5, such a configuration can reduce the weight of the seal 3, thereby achieving weight reduction of the battery pack.

[0053] In some embodiments, see Figures 8 to 9 , a weight-reducing piece 5 for blocking the groove 32 and / or hole 31 of the seal 3 is provided on the side of the glue-filling cover 4 facing the battery cell 1, that is, in the process of filling glue into the glue-filling cover 4 and solidifying the glue into the seal 3 of the sealing adapter 2 and the tab, the weight-reducing piece 5 is provided on the side of the glue-filling cover 4 facing the battery cell 1 before filling glue, and the weight-reducing piece 5 can occupy part of the glue-filling space, so that the seal 3 after the glue solidifies can form a groove 32 and / or hole 31, and ensure that the density of the weight-reducing piece 5 is less than that of the seal 3. Compared with the scheme without the weight-reducing piece 5, such a configuration can reduce the weight of the seal 3, thereby achieving weight reduction of the battery pack.

[0054] It should be noted that the arrangement of the weight-reducing portion 41 and the weight-reducing member 5 is not limited here, and 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. Moreover, the number of the weight-reducing portion 41 and the weight-reducing member 5 provided is not limited, and one or more weight-reducing portions 41 and weight-reducing members 5 may be provided.

[0055] In some embodiments, see Figure 4, the weight-reducing member 5 is set as a hollow tube. Such a setting 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.

[0056] It should be noted that, here, it is only necessary to ensure that the density of the weight-reducing component 5 is smaller than that of the sealing component 3 after the colloid is cured, so that the purpose of reducing the weight of the battery pack can be achieved. Exemplarily, the weight-reducing component 5 can also be a lightweight structure such as a foam tube or a foam tube.

[0057] In some embodiments, see Figure 8 The sealing member 3 is arranged around the weight-reducing member 5 and forms a groove 32. That is, the weight-reducing member 5 is filled in the groove 32. As can be seen from the above embodiments, the sealing member 3 is formed by solidifying the foam glue or the potting glue. After the foam glue or the potting glue is solidified into the sealing member 3, the sealing member 3 will be bonded to the weight-reducing member 5, so that the sealing effect of the sealing member 3 can be ensured while reducing the weight of the sealing member 3.

[0058] In some embodiments, see Figure 3 , the weight-reducing part 41 is set as an annular protrusion integrally formed with the glue filling cover 4. In other words, the weight-reducing part 41 is a hollow protrusion, which can further reduce the weight of the battery pack compared with a solid protrusion, further improving the weight-reducing effect, and the weight-reducing part 41 and the glue filling cover 4 are integrally formed to improve the stability of the weight-reducing part 41 structure, and prevent the weight-reducing part 41 from shaking during the glue filling process.

[0059] It should be noted that, here, it is only necessary to ensure that the density of the weight-reducing part 41 is smaller than that of the sealant 3 after the colloid is cured, so that the purpose of reducing the weight of the battery pack can be achieved. In addition, the weight-reducing part 41 and the glue-filling cover 4 can also be in other forms, for example, the weight-reducing part 41 and the glue-filling cover 4 are separately arranged, and the weight-reducing part 41 and the glue-filling cover 4 are connected together by bonding, clamping, etc.

[0060] In some embodiments, see Figure 8 and Fig. 9 , the seal 3 is arranged around the weight-reducing portion 41 and forms a hole 31. That is to say, the seal 3 is formed by solidifying the foam glue or the potting glue, and the weight-reducing portion 41 is partially filled in the foam glue or the potting glue. After the foam glue or the potting glue is solidified into the seal 3, the seal 3 will be bonded to the weight-reducing portion 41, and the weight-reducing portion 41 is a part of the potting cover 4 or connected to the potting cover 4, so that 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.

[0061] In some embodiments, see Figure 8If the hole 31 is connected to the groove 32, the amount of colloid filling at this location will be small, which will result in the seal 3 being thinner and lighter in weight. In this way, the structural stability of the seal 3 is poor. When the assembled battery pack inevitably shakes, the seal 3 at this location may break. Therefore, in this embodiment, the hole 31 and the groove 32 are not connected, which can improve the structural stability of the seal 3 at this location and improve the sealing effect of the seal 3 on the tab and the adapter 2.

[0062] In some embodiments, see Figure 8 , the extension length of the groove 32 is greater than the extension length of the hole 31. Specifically, in the thickness direction of the seal 3, since the hole 31 penetrates the seal, the structural strength of the area where the hole 31 is provided in the seal 3 is lower than the area where the groove 32 is provided in the seal 3. Here, the length of the groove 32 is ensured to be greater than the length of the hole 31, so that the structural strength of the seal 3 can be ensured while further reducing the weight of the seal 3.

[0063] 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, and the groove 32 does not penetrate the seal 3, compared with the groove 32, the hole 31 can further reduce the weight of the seal 3.

[0064] It should be noted that the thickness direction of the seal 3 refers to Figure 8 The direction is indicated by the double-headed arrow Y.

[0065] 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 the arrangement in which the extending directions of the groove 32 and the hole 31 intersect, the arrangement of this embodiment can improve the rigidity of the seal 3, and when the seal 3 is subjected to external force, each part of the seal 3 can disperse the external force, thereby preventing the seal 3 from breaking when the battery pack inevitably vibrates, thereby improving the structural strength of the seal 3.

[0066] 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 .

[0067] 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 filling the battery pack with glue 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 component 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 pole ear 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, it is convenient to arrange the weight reducing portion 41 and / or the weight reducing component 5, so as to make the internal layout of the battery pack more compact, and enable the weight reducing portion 41 and / or the weight reducing component 5 to occupy more glue filling space, so as to enhance the weight reducing effect of the seal 3 and further reduce the weight of the battery pack.

[0068] In some embodiments, see Figure 6 , taking the battery cell 1 placed upright as an example, curling will inevitably occur in the area near the pole ear at the top of the battery cell 1, resulting in a smaller distance between the areas near the pole ear at the top of the battery cell 1 of two adjacent battery cells 1. If the cross-section of the weight-reducing member 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 pouring cover 4, bubbles may be generated at this position due to the small distance between the weight-reducing member 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 direction of the weight-reducing member 5, the cross-section of the weight-reducing member 5 is a trapezoid, and the side length of the cross-section close to the glue pouring cover 4 is smaller than the side length away from the glue pouring cover 4. In this way, the distance between the weight-reducing member 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 structure formed by the solidification of the colloid and improving the sealing effect of the seal 3 on the adapter 2.

[0069] For example, the length direction of the weight-reducing member 5 is Figure 6 The direction indicated by the double-headed arrow A in the figure is perpendicular to the length direction of the weight-reducing member 5. Figure 6 The plane where arrows B and C are located.

[0070] In some embodiments, it can be seen from the above-mentioned glue pouring process of the adapter 2 that after the glue pouring cover 4 and the adapter 2 are installed together, when the assembled battery cell 1 components and the glue pouring cover 4 are in an upright state, the weight-reducing member 5 is inserted between the adjacent battery cells 1 from the top area of ​​the battery cell 1, and then the above-mentioned assembled components are placed in the shell, and then the above-mentioned components placed in the shell are inverted. At this time, the weight-reducing member 5 will move toward the glue pouring cover 4 due to its own gravity and fit with the adapter 2. In this way, during the glue pouring process, if the gap between the weight-reducing member 5 and the adapter 2 is too small, the colloid will not be able to flow between the weight-reducing member 5 and the adapter 2, that is, bubbles may be formed between the weight-reducing member 5 and the adapter 2, resulting in a poor sealing effect of the colloid on the adapter 2. Therefore, a limiting member (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, so that 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.

[0071] Exemplarily, the limiting member may be one or a combination of structures such as foam, hollow tube, or support blocks arranged at intervals.

[0072] In some embodiments, see Figure 6 , in the height direction of the battery cell 1, the height of the limiter is H, where H satisfies: 2mm≤H≤10mm. Here, ensuring that the height of the limiter is within the above range can prevent the size of the limiter from being too small, avoid the formation of bubbles between the weight-reducing component 5 and the adapter 2 during the glue filling process, and improve the sealing effect of the sealing component 3 on the adapter 2; it can also prevent the height of the limiter from being too large, avoid the weight-reducing component 5 from occupying too little glue filling space, and avoid too little weight reduction of the battery pack.

[0073] It should be noted that the height of the limiter refers to the height of the limiter. Figure 6 Dimensions in the direction indicated by the double-headed arrow B.

[0074] Exemplarily, the height of the limiter may be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0075] 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 for the adapter 2 and the pole ear, so as to ensure the sealing effect of the adapter 2 and the pole ear; and, it can be seen from the above embodiments that in order to enhance 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 open 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.

[0076] In addition, the top of the seal 3 is required to be higher than or equal to the top of the weight-reducing component 5, that is, during the glue injection process, the colloid is completely submerged in the weight-reducing component 5 or the top surface of the colloid is flush with the top surface of the weight-reducing component 5. This can further reduce the amount of glue injection, thereby further reducing the weight of the battery pack while meeting the sealing requirements of the adapter 2.

[0077] It should be noted that the battery pack is in the upright position. Figure 1 The state shown is the state where the glue filling cover 4 and the adapter 2 are located at the top of the battery cell 1; the inverted state of the battery pack (not shown in the figure) is the state where the glue filling cover 4 and the adapter 2 are located at the bottom and the battery cell 1 is located at the top.

[0078] In some embodiments, the height of the seal 3 is higher than the dimension of the top seal 11 of the battery cell 1 by h, where h satisfies: 1mm≤h≤7mm (not shown in the figure). Here, ensuring that the height of the seal 3 exceeds the dimension of the top seal 11 to meet the above range can avoid the seal 3 failing to complete the sealing of 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; and can also avoid the height of the seal 3 exceeding the top seal 11 by too much, avoiding excessive glue injection.

[0079] 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.

[0080] Exemplarily, the height of the sealing member 3 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, etc. higher than the top sealing edge 11 .

[0081] In some embodiments, a glue injection hole (not shown in the figure) is provided on one end of the side wall of the housing near the glue injection cover 4. With such a configuration, when the battery pack is in an inverted state and the glue injection cover 4 is injected with glue, the glue injection hole is arranged close to the glue injection cover 4, which can reduce the movement distance of the glue flowing to the glue injection cover 4, prevent the glue from adhering to other parts of the battery pack, further reduce the use of the glue, and thus achieve the purpose of reducing the weight of the battery pack to a certain extent.

[0082] 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 with 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 colloid 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 colloid can flow between the adapter 2 and the glue filling cover 4 during the colloid 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 colloid on the adapter 2.

[0083] Furthermore, a plurality of exhaust holes 21 are provided on the adapter 2, and the exhaust holes 21 are evenly provided on the adapter 2, which can further reduce 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.

[0084] In some embodiments, see Figure 3 The glue filling cover 4 is provided with a buckle 42 that is engaged with the edge of the adapter 2, that is, the glue filling cover 4 and the adapter 2 are detachably connected by the buckle. Here, by connecting the glue filling cover 4 and the adapter 2 in the above manner, it is possible to avoid shaking between the glue filling cover 4 and the adapter 2 before the battery cell 1 assembly is inverted and the glue filling cover 4 is filled with glue, and to avoid displacement between the two, thereby improving the stability of the connection; and, by the buckle 42, the connection between the adapter 2 and the glue filling cover 4 is achieved by the buckle, which can play a positioning effect, and can improve the installation efficiency of the glue filling cover 4.

[0085] 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.

[0086] 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.

[0087] It should be noted that the electrical equipment may be industrial electrical equipment, such as cranes, excavators and other construction machinery; the electrical equipment may also be household appliances, such as cleaning robots, refrigeration appliances and other household appliances; the electrical equipment may also be transportation vehicles, such as electric vehicles, hybrid vehicles, fuel vehicles and other transportation vehicles; of course, the electrical equipment may also be the aircraft mentioned above.

[0088] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0089] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0090] 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. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0091] 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 the widest scope consistent with the principles and novel features disclosed herein.

[0092] 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 explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0093] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery pack, characterized in that: include: case; A plurality of battery cells are provided and all are located in the housing; A switching piece connected to the tab of the battery cell; A seal seals the adapter and the pole lug, the seal is provided with a hole and / or a groove; the seal is provided with a fixing groove for accommodating and fixing the pole lug, the groove is not connected to the fixing groove, and / or the hole is not connected to the fixing groove.

2. The battery pack according to claim 1, characterized in that: It also includes a glue filling cover, which is connected to the adapter and receives a sealant that seals the adapter and the tab.

3. The battery pack according to claim 2, characterized in that: The sealing component wraps the head of the tab and the adapter, and the sealing component is in contact with the glue potting cover on a surface close to the glue potting cover.

4. The battery pack according to claim 1 or 2, characterized in that: The sealing member is formed by curing the foaming glue or the potting glue.

5. The battery pack according to claim 2, characterized in that: A weight-reducing portion is provided on one side of the glue filling cover protruding toward the battery core, and the density of the weight-reducing portion is lower than the density of the seal; and / or a weight-reducing component is provided on one side of the glue filling cover protruding toward the battery core, and the density of the weight-reducing component is lower than the density of the seal.

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

7. The battery pack according to claim 5, characterized in that: The sealing member is disposed around the weight reducing member and forms the groove.

8. The battery pack according to claim 5 or 6, characterized in that: The weight-reducing portion is an annular protrusion formed integrally with the glue-filling cover.

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

10. The battery pack according to claim 9, 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, an extension direction of the groove is parallel to an extension direction of the hole.

11. The battery pack according to claim 5, characterized in that: At least some of the 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.

12. The battery pack according to claim 5, characterized in that: 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.

13. The battery pack according to claim 5 or 12, characterized in that: A limiting member for limiting the distance between the weight reducing member and the adapter is arranged on one side of the weight reducing member close to the adapter.

14. The battery pack according to claim 13, characterized in that: In the height direction of the battery core, the height of the limiting member is H, wherein H satisfies: 2mm≤H≤10mm.

15. The battery pack according to claim 5, 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 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.

16. The battery pack according to claim 15, characterized in that: 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.

17. The battery pack according to claim 2, characterized in that: A glue injection hole is formed on one end of the side wall of the shell body close to the glue injection cover.

18. The battery pack according to claim 1, characterized in that: A plurality of exhaust holes are provided on the adapter.

19. The battery pack according to claim 2, characterized in that: The glue-filling cover is provided with a buckle which is engaged with the edge of the adapter.

20. An electrical equipment, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 19.

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