Waterproof battery module, battery pack and electric device

Abstract

The embodiment of the utility model provides a waterproof battery module, a battery pack and an electric device. The waterproof battery module comprises: a battery module, wherein the battery module comprises two end surfaces which are arranged away from each other along the first direction; wherein the first direction is the length direction of the battery module; the thermal shrinkable sleeve is coated on the battery module along the first direction, at least part of the thermal shrinkable sleeve extends out of the end surface, and the thermal shrinkable sleeve and the end surface are enclosed to form a containing cavity with an opening; and the sealing glue layer is arranged in the accommodating cavity so as to seal the opening. In the embodiment of the invention, the structure of the waterproof battery module is simpler, and the cost is saved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a waterproof battery module, a battery pack and an electrical device. Background Art

[0002] Power batteries, such as lithium-ion batteries and sodium-ion batteries, are widely used in various fields, including portable electronic devices, electric vehicles, and energy storage devices, due to their advantages such as high energy density and excellent cycle performance. With the widespread application of power batteries, in order to meet the increasing safety performance requirements of power batteries, power batteries often adopt waterproof structures to ensure waterproof performance.

[0003] In the prior art, waterproof battery modules typically include a battery module, a heat shrink sleeve, and a sealant layer. The heat shrink sleeve is applied to the outer surface of the battery module, leaving open openings at both ends. A sealant layer is typically required to seal these open openings to achieve waterproofing. However, to improve the sealing effect of the sealant layer on the open openings, additional components are typically installed on the end faces of the battery module to limit the sealant during the formation of the sealant layer. This makes the waterproof battery module structure more complex and expensive. Utility Model Content

[0004] The present application aims to provide a waterproof battery module, a battery pack and an electrical device to solve the problem that the existing waterproof battery module has a relatively complex structure and high cost.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a waterproof battery module, comprising:

[0007] A battery module, the battery module comprising two end surfaces disposed away from each other along a first direction; wherein the first direction is a length direction of the battery module;

[0008] a heat shrink sleeve, the heat shrink sleeve covering the battery module along the first direction, the heat shrink sleeve at least partially extending outside the end surface, the heat shrink sleeve and the end surface enclosing a receiving cavity with an open opening;

[0009] and a sealing layer, wherein the sealing layer is arranged in the accommodating cavity to seal the opening.

[0010] Optionally, the area of ​​a first cross section of the opening close to the end face is a, the area of ​​a second cross section of the opening away from the end face is b, and the relationship between a and b satisfies: a≤b.

[0011] Optionally, the sealant layer is formed by solidifying liquid sealant.

[0012] Optionally, the waterproof battery module further comprises a gasket;

[0013] The battery module includes two battery holders arranged in parallel along the first direction and a plurality of battery cells, and the end surfaces of the two battery holders along the first direction are aligned; the plurality of battery cells are installed in the battery holders;

[0014] The gasket is connected to the end surfaces of the two battery cell supports, and the gasket and the heat shrink sleeve are enclosed to form the accommodating cavity.

[0015] Optionally, the gasket is adhered to the end faces of the two battery cell supports.

[0016] Optionally, the gasket includes an adhesive layer, and the adhesive layer is arranged on a side of the gasket away from the battery module.

[0017] Optionally, the liner is a polycarbonate liner.

[0018] Optionally, the heat shrink sleeve is made of polyvinyl chloride heat shrink film.

[0019] Optionally, the sealant is a self-leveling liquid before curing.

[0020] In a second aspect, the present application further discloses a battery pack, which includes at least one waterproof battery module as described in any one of the above items.

[0021] In a third aspect, the present application further discloses an electrical device, which includes the battery pack described above.

[0022] In the embodiment of the present application, the waterproof battery module includes: a battery module, a heat shrink sleeve and a sealing layer, the battery module includes two end faces arranged in opposite directions along the first direction; the heat shrink sleeve is wrapped around the battery module along the first direction, the heat shrink sleeve at least partially extends outside the end face, and the heat shrink sleeve and the end face are combined to form a receiving cavity with an open opening; the sealing layer is arranged in the receiving cavity to close the opening. In this way, by at least partially protruding from the end of the heat shrink sleeve and combining with the end face to form a receiving cavity with an open opening, and injecting sealant into the receiving cavity to form a sealing layer, the opening can be sealed. That is, in the process of forming the sealing layer, there is no need to set additional components to limit the sealing glue, thereby making the structure of the waterproof battery module simpler and reducing costs.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic structural diagram of a waterproof battery module according to an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the structural decomposition of a waterproof battery module according to an embodiment of the present application;

[0027] Figure 3 This is another structural schematic diagram of a waterproof battery module described in an embodiment of the present application;

[0028] Figure 4 This is a schematic diagram of the coordination of a waterproof battery module and auxiliary tooling shown in an embodiment of the present application.

[0029] Figure numerals: 1 - waterproof battery module, 10 - battery module, 101 - end face, 11 - heat shrink sleeve, 102 - opening, 1021 - first cross section, 1022 - second cross section, 103 - accommodating cavity, 104 - battery cell holder, 105 - battery cell, 12 - sealing adhesive layer, 13 - gasket, 14 - auxiliary tooling, Z - first direction. DETAILED DESCRIPTION

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. 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.

[0031] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] An embodiment of the present application provides a waterproof battery module, which is described in detail below with reference to the accompanying drawings.

[0035] Reference Figure 1 , shows a schematic structural diagram of a waterproof battery module according to an embodiment of the present application, referring to Figure 2 , shows a schematic diagram of the exploded structure of a waterproof battery module according to an embodiment of the present application. The waterproof battery module 1 comprises: a battery module 10, comprising two end faces 101 disposed in a first direction Z, which is the length of the battery module 10; a heat shrink sleeve 11, which is wrapped around the battery module 10 along the first direction Z, and at least partially extends beyond the end faces 101. The heat shrink sleeve 11 and the end faces 101 enclose a receiving cavity 103 having an opening 102; and a sealant layer 12, which is disposed within the receiving cavity 103 to seal the opening 102.

[0036] In the embodiment of the present application, by wrapping the heat shrink sleeve 11 around the exterior of the battery module 10, the battery module 10 can be completely and seamlessly wrapped, thereby providing the battery module 10 with excellent waterproofing. By extending at least a portion of the heat shrink sleeve beyond the protruding end and enclosing the end surface to form an open accommodating cavity, and injecting sealant into the accommodating cavity to form a sealant layer, the open cavity can be sealed, further enhancing the waterproofing performance of the battery module 10. Furthermore, during the formation of the sealant layer 12, no additional components are required to limit the sealant, thereby simplifying the structure of the waterproof battery module 1 and reducing costs.

[0037] Specifically, refer to Figure 1 and Figure 2 The heat shrink sleeve 11 is placed over the battery module 10 along its length. The length of the heat shrink sleeve 11 needs to be greater than the length of the battery module 10 to allow for deformation of the heat shrink sleeve 11. When heated, the heat shrink sleeve 11 deforms toward the surface of the battery module 10, completely covering the surface of the battery module 10.

[0038] Specifically, the accommodating cavity 103 is formed by attaching an auxiliary tooling 14 to the end of the battery module 10. The auxiliary tooling 14 has a raised portion that mates with the accommodating cavity 103. The raised portion of the auxiliary tooling 14 is made of silicone. After being heated, the heat shrink sleeve 11 mates with the raised portion of the auxiliary tooling 14 at the end surface 101 to form the accommodating cavity 103 with an opening 102. After the heat shrink sleeve 11 is completely shrunk, the auxiliary tooling 14 is removed, forming the accommodating cavity 103.

[0039] Specifically, one of the end faces 101 is a lead end, and a wire (not shown in the figure) is provided at the lead end. One end of the wire is connected to the battery module, and the other end is used to connect to an external load to supply power to the external load.

[0040] Optionally, refer to Figure 3 , shows a structural schematic diagram of a waterproof battery module described in an embodiment of the present application, the area of ​​the first cross-section 1021 of the opening 102 close to the end face 101 is a, the area of ​​the second cross-section 1022 of the opening 102 away from the end face 101 is b, and the relationship between a and b satisfies: a≤b.

[0041] In this embodiment, if Figure 3As shown, the area a of the first cross-section 1021 can be less than or equal to the area b of the second cross-section 1022. When a equals b, the cross-sectional area of ​​the sealant layer 12 in the accommodating cavity 103 along the first direction Z is identical to the cross-sectional area of ​​the end face 101 along the first direction Z, further improving the sealing effect of the end face 101. When a is less than b, the cross-sectional area of ​​the sealant layer 12 along the first direction Z is less than the cross-sectional area of ​​the end face 101 along the first direction Z. The accommodating cavity 103 has an overall tapered structure. Without affecting the sealing effect of the end face 101, the amount of sealant contained therein is reduced, further reducing the cost of the waterproof battery module 1.

[0042] Optionally, the sealant layer 12 is formed by curing liquid sealant.

[0043] In this embodiment, the sealant layer 12 is formed by solidifying a liquid sealant, which is a self-leveling liquid. The sealant is injected into the accommodating cavity 103, and the sealant can self-level and fill the accommodating cavity 103. After solidification, a sealant layer 12 is formed. In actual applications, a liquid sealant is used to form the sealant layer 12 to seal the end face of the battery module 10. During the formation of the sealant layer 12, no additional process is required. The liquid sealant can self-level to form the sealant layer 12, making the process of the waterproof battery module 1 simpler.

[0044] Optionally, refer to Figure 2 The waterproof battery module 1 also includes a gasket 13; the battery module 10 includes two battery cell holders 104 and a plurality of battery cells 105 arranged in parallel along the first direction Z, and the end faces 101 of the two battery cell holders 104 along the first direction Z are aligned; the plurality of battery cells 105 are installed in the battery cell holders 104; the gasket 13 is connected to the end faces 101 of the two battery cell holders 104, and the gasket 13 and the heat shrink sleeve 11 enclose the accommodating cavity 103.

[0045] In this embodiment, if Figure 2 As shown, two battery cell holders 104 are arranged side by side along a first direction Z, and the end faces 101 of the two battery cell holders 104 along the first direction Z are aligned. A plurality of battery cells 105 are installed in the battery cell holders 104. There is a gap between the end faces 101 of the two battery cell holders 104. A gasket 13 is connected to the end faces of the two battery cell holders 104 to block the gap and prevent the sealant from flowing into the gap and onto the battery cell 105, which can cause the battery cell to malfunction and thus affect the normal operation of the waterproof battery module 1. In addition, when the waterproof battery module 1 is subjected to other situations such as collision, resulting in cracking, damage, etc. of the sealant layer 12, the gasket 13 can also prevent water from entering the gap, further improving the waterproof effect of the end face of the waterproof battery module 1.

[0046] Optionally, refer to Figure 2 The gasket 13 is adhered to the end faces 101 of the two battery cell supports 104 .

[0047] Specifically, the gasket 13 is an adhesive-backed gasket, and the glue on its back can be waterproof glue. In this embodiment, the gasket 13 can be attached to the end faces 101 of the two battery holders 104 to close the gap between the end faces 101 of the two battery holders 104, further improving the connection reliability between the gasket 12 and the end faces 101.

[0048] Optionally, refer to Figure 2 , refer to Figure 4 , shows a schematic diagram of the cooperation between a waterproof battery module and auxiliary tooling shown in an embodiment of the present application, the pad 13 includes an adhesive layer, and the adhesive layer 130 is arranged on the side of the pad 13 away from the battery module 10.

[0049] In practical applications, such as Figure 2 and Figure 4 As shown, the adhesive layer 130 is disposed on the side of the gasket 13 away from the battery module 10. The adhesive layer is disposed in the middle of the gasket 13 and may be smaller in area than the gasket 13. The adhesive layer is used to secure the auxiliary fixture 14. The auxiliary fixture 14 is secured to the end face 101 of the battery module 10 via the adhesive layer. This allows the heat shrink sleeve 11 to deform toward the surface of the battery module 10 after being heated, completely covering the surface of the battery module 10. The end face 101 cooperates with the raised portion of the auxiliary fixture 14 to form a receiving cavity 103 with an opening 102.

[0050] For example, the adhesive layer can be made of glue, tape, or fixing glue, and the embodiment of the present application does not specifically limit the material of the adhesive layer.

[0051] Optionally, the liner 13 is a polycarbonate liner.

[0052] In this embodiment, the gasket 13 is a polycarbonate gasket. On the one hand, the polycarbonate gasket has good waterproof performance, which further improves the waterproof performance of the waterproof battery module 1. On the other hand, polycarbonate is a common material. Using a polycarbonate gasket can further reduce the cost of the waterproof battery module 1.

[0053] The heat shrink sleeve 11 is made of polyvinyl chloride heat shrink film.

[0054] Specifically, polyvinyl chloride heat shrinkable film has good transparency, is easy to shrink, has high strength, and its shrinkage rate can be freely adjusted according to user needs. It is highly operable and has good waterproof effect. It is widely used in the packaging of various commodities such as wine, food, sporting goods, sterilized tableware, electronic appliances, daily necessities, handicrafts, health care products, audio-visual products, medicines, stationery, toys, doors, plastic hardware, glass and ceramics. In the embodiment of the present application, the heat shrinkable sleeve 11 is made of polyvinyl chloride heat shrinkable film. On the one hand, it makes the waterproof battery module have higher waterproof performance. On the other hand, polyvinyl chloride heat shrinkable film is a common heat shrinkable sleeve material, which can further reduce the cost of the waterproof battery module.

[0055] In summary, the waterproof battery module 1 provided in the embodiment of the present application has at least the following advantages:

[0056] In the embodiment of the present application, by wrapping the heat shrink sleeve 11 around the outside of the battery module 10, the battery module 10 can be completely and seamlessly wrapped, making the battery module 10 waterproof. By at least partially extending the heat shrink sleeve beyond the protruding end and enclosing the end surface to form an open accommodating cavity, and injecting sealant into the accommodating cavity to form a sealant layer, the open opening can be sealed, further improving the waterproof performance of the battery module 10. On the other hand, during the formation of the sealant layer 12, no additional components are required to limit the sealant, thereby making the structure of the waterproof battery module 1 simpler and reducing costs.

[0057] An embodiment of the present application further provides a battery pack, which includes at least one waterproof battery module 1 described in any of the above embodiments.

[0058] It should be noted that in the embodiment of the present application, the structure of the waterproof battery module 1 is the same as the structure of the waterproof battery module 1 described in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0059] The present application also provides an electrical device, which includes the battery pack described in the above embodiment. The battery pack is used to provide electrical energy to the electrical device, which can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy and electric tool. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys; electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0060] It should be noted that in the embodiment of the present application, the structure of the battery pack is the same as the structure of the battery pack described in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0061] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0062] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A waterproof battery module, characterized in that: The waterproof battery module (1) comprises: A battery module (10), the battery module (10) comprising two end surfaces (101) disposed in opposite directions along a first direction (Z); wherein the first direction (Z) is the length direction of the battery module (10); a heat shrink sleeve (11), the heat shrink sleeve (11) covering the battery module (10) along the first direction (Z), the heat shrink sleeve (11) at least partially extending outside the end surface (101), the heat shrink sleeve (11) and the end surface (101) enclosing to form a receiving cavity (103) having an opening (102); and a sealing rubber layer (12), wherein the sealing rubber layer (12) is disposed in the accommodating cavity (103) to seal the opening (102).

2. The waterproof battery module according to claim 1, characterized in that: The area of ​​a first cross section (1021) of the opening (102) close to the end surface (101) is a, and the area of ​​a second cross section (1022) of the opening (102) away from the end surface (101) is b, and the relationship between a and b satisfies: a≤b.

3. The waterproof battery module according to claim 1, characterized in that: The sealant layer (12) is formed by solidifying liquid sealant.

4. The waterproof battery module according to claim 1, characterized in that: The waterproof battery module further includes a gasket (13); The battery module (10) comprises two battery cell supports (104) and a plurality of battery cells (105) arranged in parallel along the first direction (Z), wherein the end faces (101) of the two battery cell supports (104) are aligned along the first direction (Z); the plurality of battery cells (105) are installed in the battery cell supports (104); The gasket (13) is connected to the end surfaces (101) of the two battery core supports (104), and the gasket (13) and the heat shrink sleeve (11) are enclosed to form the accommodating cavity (103).

5. The waterproof battery module according to claim 4, characterized in that: The gasket (13) is adhered to the end surfaces (101) of the two battery cell supports (104).

6. The waterproof battery module according to claim 4, characterized in that: The gasket (13) comprises an adhesive layer, and the adhesive layer is arranged on a side of the gasket (13) away from the battery module (10).

7. The waterproof battery module according to claim 4, characterized in that: The liner (13) is a polycarbonate liner.

8. The waterproof battery module according to claim 1, characterized in that: The material of the heat shrink sleeve (11) is polyvinyl chloride heat shrink film.

9. A battery pack, characterized in that: Comprising at least one waterproof battery module according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical device includes the battery pack according to claim 9.

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