Battery pack filling assembly, battery pack and electric equipment

Abstract

The utility model relates to a battery pack filling assembly, a battery pack and electric equipment, the battery pack filling assembly is suitable for being filled in a gap between a battery cell group of the battery pack and a beam of a tray, the battery pack filling assembly comprises a first shell and a second shell which are connected in a folding manner, and a containing cavity is formed between the first shell and the second shell; one of the first shell and the second shell is propped against the battery cell group, and the other one of the first shell and the second shell is propped against the beam of the tray. According to the battery pack filling assembly provided by the invention, the accommodating cavity can be uniformly filled by utilizing the fluidity of the colloid, so that on one hand, the battery pack filling assembly has good strength, and on the other hand, the battery pack filling assembly is uniformly stressed at all positions, propped against the first shell or the second shell, of the battery cell group; and the battery pack filling assembly can provide good support for the battery cell group in the whole life cycle of the battery cell group by utilizing the lasting and good strength of the colloid after solidification.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery packs, and in particular, to a battery pack filling assembly, a battery pack, and an electrical device. Background Art

[0002] The battery pack capacity retention rate affects the range of electric vehicles and is one of the important indicators for evaluating the comprehensive performance of the battery pack. The battery pack usually includes a tray and a battery cell group arranged in the tray. The battery cell group is composed of multiple stacked batteries. In order to smoothly load the battery cell group into the tray, there must be an assembly gap between the beam of the tray and the battery cell group. The battery cell group has a movable space in the tray, which causes a gap between the batteries. Studies have shown that this gap will cause the capacity of the battery cell to decrease with the increase in the number of charge and discharge cycles, thereby reducing the capacity retention rate of the battery pack. Therefore, it is very necessary to fill the gap between the beam of the tray and the battery cell group. However, the filling effect of this gap in the related art is not ideal. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery pack filling assembly, a battery pack, and an electrical device to at least partially solve the technical problems existing in the related art.

[0004] In order to achieve the above object, according to a first aspect of the present disclosure, a battery pack filling assembly is provided, the battery pack filling assembly is suitable for filling the gap between the battery cell group of the battery pack and the beam of the tray, the battery pack filling assembly comprises a first shell and a second shell connected to each other;

[0005] An accommodating cavity is provided between the first shell and the second shell, and the accommodating cavity is suitable for filling with colloid. One of the first shell and the second shell abuts against the battery cell group, and the other abuts against the beam of the tray.

[0006] Optionally, a first annular protrusion is provided on a side of the first shell facing the second shell;

[0007] The first annular protrusion contacts the second shell to define the accommodating cavity together with the second shell.

[0008] Optionally, a second annular protrusion is provided on a side of the second shell facing the first shell;

[0009] The second annular protrusion is sleeved on the outer side of the first annular protrusion, and a mounting cavity is formed between the inner side wall of the second annular protrusion and the outer side wall of the first annular protrusion;

[0010] The battery pack filling assembly also includes an annular seal disposed within the mounting cavity.

[0011] Optionally, the first housing includes a first plate body and the first annular protrusion disposed on the first plate body, and the first plate body has an annular extension portion located outside the first annular protrusion;

[0012] The second housing includes a second plate body and the second annular protrusion disposed on the second plate body;

[0013] The outer side wall of the first annular protrusion, the inner side wall of the second annular protrusion, the inner wall of the annular extension and a part of the inner wall of the second plate body jointly define the installation cavity;

[0014] One end surface of the annular seal contacts a portion of the inner wall of the second plate body, and the other end surface of the annular seal contacts the inner wall of the annular extension portion.

[0015] Optionally, in a spacing direction between the first plate body and the second plate body, the annular seal is in a compressed state.

[0016] Optionally, in a spacing direction between the first annular protrusion and the second annular protrusion, the annular seal is in a compressed state.

[0017] Optionally, in the spacing direction between the first plate body and the second plate body, the size of the annular seal is 1 mm to 20 mm; and / or,

[0018] In the spacing direction between the first annular convex portion and the second annular convex portion, the size of the annular seal is 1 mm to 20 mm.

[0019] Optionally, a seal is provided at the connection between the first shell and the second shell.

[0020] Optionally, a wire passing groove is provided on the first shell and / or the second shell.

[0021] Optionally, a second annular protrusion is provided on a side of the second shell facing the first shell;

[0022] The second annular protrusion is sleeved on the outer side of the first shell, the wire passing groove is arranged on the outer surface of the side wall of the second annular protrusion, and both ends of the wire passing groove pass through the length direction of the second shell.

[0023] Optionally, the cross-section of the wire groove is in an inverted T shape.

[0024] Optionally, the battery pack filling assembly further includes a colloid, and the colloid is contained in the containing cavity.

[0025] Optionally, the colloid is foaming glue.

[0026] Optionally, the first shell and the second shell are movably connected along the mating direction.

[0027] According to a second aspect of the present disclosure, there is provided a battery pack, comprising a tray, a battery cell group and the above-mentioned battery pack filling assembly;

[0028] The battery cell group is arranged in the cavity of the tray;

[0029] The battery pack filling assembly is filled in the gap between the battery cell group and the beam of the tray.

[0030] According to a third aspect of the present disclosure, there is provided an electrical device, comprising a device body and the above-mentioned battery pack, wherein the battery pack is installed on the device body and is suitable for supplying power to the device body.

[0031] Through the above technical solution, the battery pack filling assembly can be filled in the gap between the battery cell group of the battery pack and the beam of the tray. By injecting a preset amount of colloid into the accommodating cavity, the colloid can fill the accommodating cavity and expand the volume of the accommodating cavity, so that one of the first shell and the second shell abuts the battery cell group, and the other abuts the tray, so as to fill the gap between the tray and the battery cell group. That is, through the pre-tightening force provided by the colloid, the first shell can abut against one of the battery cell group and the beam of the tray, and the second shell can abut against the other of the battery cell group and the beam of the tray. Among them, because the colloid has fluidity, the colloid can evenly fill the accommodating cavity, which is beneficial to ensure that the battery pack filling assembly has good strength on the one hand, and is beneficial to uniform force at various locations where the battery cell group abuts against the first shell or the second shell on the other hand. On the other hand, because the colloid can maintain good strength for a long time after solidification, the battery pack filling assembly can provide good support for the battery cell group throughout its life cycle.

[0032] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0034] Figure 1 is a schematic diagram of a three-dimensional structure of a battery pack provided in one embodiment of the present disclosure;

[0035] Figure 2 is an exploded schematic diagram of a battery pack filling assembly provided in one embodiment of the present disclosure;

[0036] Figure 3 is a cross-sectional schematic diagram of a battery pack filling assembly provided in one embodiment of the present disclosure;

[0037] Figure 4 yes Figure 3 A local enlarged schematic diagram of the middle A;

[0038] Figure 5 yes Figure 3 The partial enlarged schematic diagram of point A in the middle is shown without showing the annular seal and the colloid.

[0039] Description of Reference Numerals

[0040] 1-battery pack filling assembly; 2-battery pack; 3-cell group; 4-tray; 5-gap; 11-first shell; 111-first annular protrusion; 112-first plate; 1121-annular extension; 12-second shell; 121-second annular protrusion; 122-second plate; 20-accommodating cavity; 30-installing cavity; 40-annular seal; 50-wire groove; 60-colloid; a-first size; b-second size; c-third size; d-fourth size. DETAILED DESCRIPTION

[0041] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0042] In the present disclosure, unless otherwise stated, the directional words used, such as "upper, lower, top, bottom", are usually defined by the drawing direction of the corresponding drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. "Inside and outside" refer to the inside and outside of the corresponding component outline. In addition, the terms "first", "second", etc., are used to distinguish one element from another, and do not have order and importance.

[0043] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0044] As mentioned above, the filling effect of the gap between the battery cell group and the beam of the tray in the related art is not ideal.

[0045] In view of this, if Figures 1 to 5As shown, according to the first aspect of the present disclosure, a battery pack filling assembly 1 is provided, and the battery pack filling assembly 1 is suitable for filling in the gap 5 between the battery cell group 3 of the battery pack 2 and the beam (side beam or middle beam) of the tray 4. The battery pack filling assembly 1 includes a first shell 11 and a second shell 12 that are connected to each other, and a receiving cavity 20 is provided between the first shell 11 and the second shell 12. The receiving cavity 20 is suitable for filling a colloid 60, and one of the first shell 11 and the second shell 12 abuts against the battery cell group 3, and the other abuts against the beam of the tray 4, that is, one of the first shell 11 and the second shell 12 is suitable for abutting against the battery cell group 3 under the action of the colloid 60, and the other is suitable for abutting against the beam of the tray 4 under the action of the colloid 60.

[0046] Through the above technical solution, the battery pack filling assembly 1 can be filled in the gap 5 between the cell group 3 of the battery pack 2 and the beam of the tray 4. By injecting a preset amount of colloid 60 into the accommodating cavity 20, the colloid 60 can fill the accommodating cavity 20 and expand the volume of the accommodating cavity 20, so that one of the first shell 11 and the second shell 12 can abut against the cell group 3, and the other can abut against the tray 4, thereby filling the gap 5 between the tray 4 and the cell group 3. That is, through the pre-tightening force provided by the colloid 60, the first shell 11 can abut against one of the cell group 3 and the beam of the tray 4, and the second shell 12 can abut against the other of the cell group 3 and the beam of the tray 4. Among them, because the colloid 60 is fluid, the colloid 60 can evenly fill the accommodating cavity 20, which is beneficial to ensure that the battery pack filling component 1 has good strength on the one hand, and on the other hand, it is beneficial to ensure that the force at each position of the abutment between the battery cell group 3 and the first shell 11 or the second shell 12 is uniform. On the other hand, since the colloid 60 can maintain good strength for a long time after solidification, the battery pack filling component 1 can provide good support for the battery cell group 3 throughout its life cycle.

[0047] In the present disclosure, optionally, the battery pack filling assembly 1 may include a colloid 60, and the colloid 60 is contained in the containing cavity 20. Here, optionally, the colloid 60 may be one or more of a foaming glue, a structural glue, and a thermally conductive glue, which is not limited in the present disclosure.

[0048] In the present disclosure, the colloid 60 can be accommodated in the accommodating cavity 20 in an easy and suitable manner. Optionally, a glue injection hole connected to the accommodating cavity 20 can be set on the first shell 11 or the second shell 12. The battery pack filling assembly 1 can be placed in the gap 5 between the battery cell group 3 and the beam of the tray 4 first, and then a preset amount of colloid 60 can be injected into the accommodating cavity 20 through the glue injection hole, so that one of the first shell 11 and the second shell 12 abuts against the battery cell group 3, and the other abuts against the beam of the tray 4, thereby completing the filling of the gap 5 between the battery cell group 3 and the beam of the tray 4.

[0049] In the embodiment where the colloid 60 is foam glue, optionally, a preset amount of foam glue can be poured into the first shell 11 or the second shell 12, and then the first shell 11 and the second shell 12 are aligned so that the foam glue is located in the accommodating cavity 20, and then the battery pack filling assembly 1 is placed in the gap 5 between the battery cell group 3 and the beam of the tray 4. As the foam glue gradually foams and expands, one of the first shell 11 and the second shell 12 abuts against the battery cell group 3 and the other abuts against the beam of the tray 4, thereby completing the filling of the gap 5 between the battery cell group 3 and the beam of the tray 4.

[0050] Optionally, the material of the first shell 11 and the second shell 12 can be one or more insulating materials such as ceramic, SMC, PP, PVC, epoxy, ABC, etc., which is not limited in the present disclosure.

[0051] In order to prevent the colloid 60 from overflowing to the outside of the battery pack filling assembly 1 and affecting the normal operation of the battery pack 2, in one embodiment of the present disclosure, a seal may be provided at the connection between the first shell 11 and the second shell 12. The present disclosure does not limit the material of the seal, and the material of the seal may include but is not limited to sealing foam.

[0052] It is understandable that in other embodiments of the present disclosure, the above-mentioned seal may not be provided, and the first shell 11 and the second shell 12 may be directly sealed together to prevent the colloid 60 from flowing to the outside of the battery pack filling assembly 1.

[0053] The present disclosure does not limit how the first shell 11 and the second shell 12 can achieve the abutment against the beams of the battery cell group 3 and the tray 4. As an embodiment, the first shell 11 and the second shell 12 can be movably connected along the mating direction of the first shell 11 and the second shell 12, that is, the first shell 11 and the second shell 12 are movably connected along the width direction of the gap 5, so that as the colloid 60 is injected into the accommodating cavity 20, the first shell 11 and the second shell 12 can move opposite to each other along the mating direction of the first shell 11 and the second shell 12, thereby achieving the abutment against the beams of the battery cell group 3 and the tray 4.

[0054] As other embodiments of the present disclosure, the first shell 11 and the second shell 12 can be deformable shells, so that as the colloid 60 is injected into the accommodating cavity 20, the first shell 11 and the second shell 12 are deformed to protrude toward the beams of the battery cell group 3 and the tray 4, thereby achieving resistance against the beams of the battery cell group 3 and the tray 4.

[0055] In order to define a receiving cavity 20 between the first shell 11 and the second shell 12, as an implementation method, Figures 3 to 5As shown, a first annular protrusion 111 is provided on a side of the first shell 11 facing the second shell 12 , and the first annular protrusion 111 contacts the second shell 12 to define a receiving chamber 20 together with the second shell 12 .

[0056] As another embodiment of the present disclosure, a third annular protrusion is provided on a side of the second shell 12 facing the first shell 11 , and the third annular protrusion contacts the first shell 11 to define a receiving chamber 20 together with the first shell 11 .

[0057] In order to improve the sealing performance of the connection between the first shell 11 and the second shell 12, as an implementation method, Figures 3 to 5 As shown, a second annular protrusion 121 is provided on the side of the second shell 12 facing the first shell 11, the second annular protrusion 121 is sleeved on the outside of the first annular protrusion 111, and an installation cavity 30 is formed between the inner wall of the second annular protrusion 121 and the outer wall of the first annular protrusion 111, and the battery pack filling assembly 1 also includes an annular seal 40, which is arranged in the installation cavity 30 to seal the gap between the first shell 11 and the second shell 12.

[0058] By arranging the annular seal 40 in the installation cavity 30, the annular seal 40 can be made to seal contact with the outer wall of the first annular protrusion 111 and the inner wall of the second annular protrusion 121. Therefore, the annular seal 40 can well seal the gap between the first shell 11 and the second shell 12, thereby improving the sealing of the connection between the first shell 11 and the second shell 12.

[0059] It should be noted that the “inside and outside” mentioned above are defined by the inside and outside of the outline of the battery pack filling component 1, that is, Figure 5 As shown, the outer side wall of the first annular protrusion 111 is the side wall of the first annular protrusion 111 that is far away from the accommodating cavity 20 , and the inner side wall of the second annular protrusion 121 is the side wall of the second annular protrusion 121 that is far closer to the accommodating cavity 20 .

[0060] In order to improve the sealing performance of the connection between the first shell 11 and the second shell 12, as an implementation method, Figures 3 to 5As shown, the first housing 11 includes a first plate 112 and a first annular protrusion 111 disposed on the first plate 112, the first plate 112 has an annular extension 1121 located outside the first annular protrusion 111, the second housing 12 includes a second plate 122 and a second annular protrusion 121 disposed on the second plate 122, the outer wall of the first annular protrusion 111, the inner wall of the second annular protrusion 121, the inner wall of the annular extension 1121 and a part of the inner wall of the second plate 122 jointly define the installation cavity 30, one end face of the annular seal 40 contacts a part of the inner wall of the second plate 122, and the other end face of the annular seal 40 contacts the inner wall of the annular extension 1121. Here, the accommodating cavity 20 can be jointly defined by the inner wall of the first annular protrusion 111, the inner wall of the second annular protrusion 121, the first plate 112 and the second plate 122.

[0061] By arranging the annular seal 40 in the installation cavity 30, one of the end faces of the annular seal 40 can be in sealing contact with a portion of the inner wall of the second plate body 122, and the other end face of the annular seal 40 can be in sealing contact with the inner wall of the extension portion. Therefore, the annular seal 40 can well seal the gap between the first shell 11 and the second shell 12, thereby improving the sealing of the connection between the first shell 11 and the second shell 12.

[0062] In addition, optionally, in the spacing direction between the first plate body 112 and the second plate body 122, the outer wall of the first plate body 112 can protrude from the end surface of the second annular protrusion 121 away from the second plate body 122, which can ensure that the outer wall of the first plate body 112 abuts against the beam of the battery cell group 3 or the tray 4, thereby making a larger abutment area between the battery pack filling assembly 1 and the beam of the battery cell group 3 or the tray 4, which is beneficial to improve the stress conditions of the beams of the battery pack filling assembly 1, the battery cell group 3 and the tray 4.

[0063] It should be noted that the “inside and outside” mentioned above are defined by the inside and outside of the outline of the battery pack filling component 1, that is, Figure 5 As shown, the inner wall of the first annular protrusion 111 is the side wall of the first annular protrusion 111 close to the accommodating cavity 20, the inner wall of the second annular protrusion 121 is the side wall of the second annular protrusion 121 farthest from the accommodating cavity 20, the inner wall of the first plate body 112 is the wall of the first plate body 112 close to the accommodating cavity 20, the inner wall of the second plate body 122 is the wall of the second plate body 122 close to the accommodating cavity 20, and the outer wall of the first plate body 112 is the wall of the first plate body 112 away from the accommodating cavity 20.

[0064] In order to improve the sealing effect of the annular seal 40 on the connection between the first shell 11 and the second shell 12, as an optional implementation, the annular seal 40 is in a compressed state in the spacing direction between the first plate body 112 and the second plate body 122, so that the annular seal 40 can fit tightly with the first plate body 112 and the second plate body 122, thereby improving the sealing effect of the annular seal 40 on the connection between the first shell 11 and the second shell 12.

[0065] Optionally, in the spacing direction between the first annular protrusion 111 and the second annular protrusion 121, the annular seal 40 is in a compressed state, so that the annular seal 40 can fit tightly with the first annular protrusion 111 and the second annular protrusion 121, thereby improving the sealing effect of the annular seal 40 on the connection between the first shell 11 and the second shell 12.

[0066] In the present disclosure, the annular seal 40 can be set to any suitable size according to actual needs, such as Figure 4 As shown, in the spacing direction between the first plate body 112 and the second plate body 122 , the size of the annular seal 40 is set to a first size a, and the first size a can be 1 mm to 20 mm, so that the annular seal 40 can fit tightly to the first plate body 112 and the second plate body 122 .

[0067] Alternatively, if Figure 4 As shown, in the spacing direction between the first annular protrusion 111 and the second annular protrusion 121, the size of the annular seal 40 is set to the second size b, and the second size b can be 1mm~20mm, so that the annular seal 40 can well seal the spacing between the first plate body 112 and the second plate body 122.

[0068] Here, optionally, Figure 2 and Figure 5 In the spacing direction between the first plate body 112 and the second plate body 122, the size of the annular seal 40 in the non-compressed state is set to a third size c, the size of the second annular protrusion 121 is set to a fourth size d, and 0.01mm<cd<5mm, so that during the relative movement of the first plate body 112 and the second plate body 122, the annular seal 40 can maintain sealing contact with the first plate body 112 and the second plate body 122.

[0069] In the present disclosure, optionally, as Figure 2 and Figure 3As shown, a wire passing groove 50 is provided on the first shell 11 and / or the second shell 12. Since the wire harness that can pass through the battery pack 2 is arranged in the wire passing groove 50, on the one hand, the arrangement of the wire harness of the battery pack 2 can have more options, which is conducive to optimizing the arrangement of the wire harness of the battery pack 2 and making good use of the space at the gap 5. On the other hand, the setting of other wire passing structures of the battery pack 2 can be saved, which is conducive to saving costs.

[0070] The wire slot 50 can be set at any suitable position according to actual needs. As an implementation method, Figure 2 and Figure 3 As shown, a second annular protrusion 121 is provided on the side of the second shell 12 facing the first shell 11, and the second annular protrusion 121 is sleeved on the outer side of the first shell 11. The wire groove 50 is provided on the outer surface of the side wall of the second annular protrusion 121, and both ends of the wire groove 50 pass through the length direction of the second shell 12.

[0071] Since the second annular protrusion 121 is sleeved on the outside of the first shell 11, the wire groove 50 is set on the outer surface of the side wall of the second annular protrusion 121. When the battery pack filling assembly 1 is located in the gap 5, the wire groove 50 can be exposed to a position that can be operated by the staff, so that the staff can lay the wiring harness in the wire groove 50.

[0072] Furthermore, both ends of the wire passage 50 penetrate the length direction of the second shell 12 , so that the wire harness running in the length direction of the second shell 12 can be arranged in the wire passage 50 .

[0073] In the present disclosure, the cross-section of the wire groove 50 can be any shape, and the present disclosure does not limit this. As an implementation method, Figure 3 As shown, the cross-section of the wire groove 50 may be in an inverted T-shape, which is helpful to prevent the wires arranged in the wire groove 50 from escaping. Optionally, the cross-section of the wire groove 50 may also be in an inverted trapezoidal shape.

[0074] According to a second aspect of the present disclosure, a battery pack 2 is provided, comprising a tray 4, a battery cell group 3 and the above-mentioned battery pack filling assembly 1, wherein the battery cell group 3 is arranged in a cavity of the tray 4, and the battery pack filling assembly 1 is filled in a gap 5 between the battery cell group 3 and the beam of the tray 4.

[0075] According to a third aspect of the present disclosure, there is provided an electrical device, comprising a device body and the above-mentioned battery pack 2, wherein the battery pack 2 is installed in the device body and is suitable for supplying power to the device body.

[0076] Here, the electrical equipment may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, electric tools, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc., the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc., the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc., and the present disclosure does not limit this.

[0077] Optionally, when the electrical device is a vehicle, the battery pack 2 may be installed on the body of the vehicle.

[0078] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0080] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery pack filling assembly, characterized in that: The battery pack filling assembly is suitable for filling the gap between the battery cell group of the battery pack and the beam of the tray, and the battery pack filling assembly includes a first shell and a second shell connected to each other; An accommodating cavity is provided between the first shell and the second shell, and the accommodating cavity is suitable for filling with colloid. One of the first shell and the second shell abuts against the battery cell group, and the other abuts against the beam of the tray.

2. The battery pack filling assembly according to claim 1, characterized in that: A first annular protrusion is provided on a side of the first shell facing the second shell; The first annular protrusion contacts the second shell to define the accommodating cavity together with the second shell.

3. The battery pack filling assembly according to claim 2, characterized in that: A second annular protrusion is provided on a side of the second shell facing the first shell; The second annular protrusion is sleeved on the outer side of the first annular protrusion, and a mounting cavity is formed between the inner side wall of the second annular protrusion and the outer side wall of the first annular protrusion; The battery pack filling assembly also includes an annular seal disposed within the mounting cavity.

4. The battery pack filling assembly according to claim 3, characterized in that: The first housing includes a first plate body and the first annular protrusion disposed on the first plate body, wherein the first plate body has an annular extension portion located outside the first annular protrusion; The second housing includes a second plate body and the second annular protrusion disposed on the second plate body; The outer side wall of the first annular protrusion, the inner side wall of the second annular protrusion, the inner wall of the annular extension and a part of the inner wall of the second plate body jointly define the installation cavity; One end surface of the annular seal contacts a portion of the inner wall of the second plate body, and the other end surface of the annular seal contacts the inner wall of the annular extension portion.

5. The battery pack filling assembly according to claim 4, characterized in that: In the spacing direction between the first plate body and the second plate body, the annular seal is in a compressed state.

6. The battery pack filling assembly according to claim 3, characterized in that: In the spacing direction between the first annular protrusion and the second annular protrusion, the annular seal is in a compressed state.

7. The battery pack filling assembly according to claim 4, characterized in that: In the spacing direction between the first plate body and the second plate body, the size of the annular seal is 1 mm to 20 mm; and / or, In the spacing direction between the first annular convex portion and the second annular convex portion, the size of the annular seal is 1 mm to 20 mm.

8. The battery pack filling assembly according to claim 1, characterized in that: A sealing member is provided at the connection between the first shell and the second shell.

9. The battery pack filling assembly according to any one of claims 1 to 8, characterized in that: The first shell and / or the second shell is provided with a wire passing groove.

10. The battery pack filling assembly according to claim 9, characterized in that: A second annular protrusion is provided on a side of the second shell facing the first shell; The second annular protrusion is sleeved on the outer side of the first shell, the wire passing groove is arranged on the outer surface of the side wall of the second annular protrusion, and both ends of the wire passing groove pass through the length direction of the second shell.

11. The battery pack filling assembly according to claim 10, characterized in that: The cross section of the wire groove is in an inverted T shape.

12. The battery pack filling assembly according to any one of claims 1 to 8, characterized in that: The battery pack filling assembly also includes a colloid, and the colloid is contained in the containing cavity.

13. The battery pack filling assembly according to claim 12, characterized in that: The colloid is foaming glue.

14. The battery pack filling assembly according to any one of claims 1 to 8, characterized in that: The first shell and the second shell are movably connected along the mating direction.

15. A battery pack, characterized in that: Comprising a tray, a battery cell group and a battery pack filling assembly according to any one of claims 1 to 14; The battery cell group is arranged in the cavity of the tray; The battery pack filling assembly is filled in the gap between the battery cell group and the beam of the tray.

16. An electrical equipment, characterized in that: The device comprises a device body and the battery pack according to claim 15, wherein the battery pack is mounted on the device body and is suitable for supplying power to the device body.

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