Waterproof shell of lithium battery

Abstract

The waterproof shell comprises a battery barrel, a battery cell group is arranged in the battery barrel, a front cover and a rear cover are arranged at the front end and the rear end of the battery barrel respectively, a battery cell support is arranged between the front cover and the battery cell group, a BMS is arranged on the inner side of the battery cell support, an output port of the BMS is located on the front face of the battery cell support, and the battery cell support is provided with a plurality of glue pouring holes. Gap spaces between the battery cell group and the battery barrel, between the battery cell group and the rear cover and between the battery cell group and the battery cell support are arranged to be glue pouring parts, sealant is arranged between the battery cell support and the battery barrel, a stepped concave part is arranged at the front end of the battery barrel, the front cover comprises an end cover plate and an attaching part connected with the end cover plate, the attaching part is arranged corresponding to the stepped concave part, the end cover plate right faces an output port of the BMS, and the end cover plate is arranged on the battery barrel. Sealant is arranged between the battery cell support at the front end of the battery cell group and the battery barrel, the rear cover at the rear end is sealed and welded at the tail part of the battery barrel, and overall glue filling of the battery is matched, so that impact resistance is facilitated, and the waterproof sealing performance of the battery is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a waterproof casing for lithium batteries. Background Technology

[0002] With the development of new energy equipment, the use of lithium batteries is becoming increasingly widespread. The cell capacity, output power, and battery load of lithium batteries are increasing, which places higher demands on how to improve overall strength and ensure battery safety. In the existing technology, such as patent CN210516774U, a high-temperature resistant lithium battery module plastic shell for food delivery vehicles is disclosed. The plastic shell includes a front cover at the front end, four battery chambers inside the plastic shell, a horizontal plate slidably connected to the right end of the front cover, multiple heat sinks at both ends of the plastic shell, a battery pack inside the battery chambers, and a rear cover with a cooling fan at the rear end of the plastic shell. The lithium battery has good heat dissipation, increases battery life, and is highly practical. However, the plastic shell lacks waterproof measures, which is not conducive to improving the safety of battery use. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and provide a waterproof casing for lithium batteries.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A waterproof lithium battery casing includes a battery compartment containing a battery cell assembly. A front cover and a rear cover are respectively installed at the front and rear ends of the battery compartment. The rear cover is welded to the rear end of the battery compartment. A battery cell support is arranged between the front cover and the battery cell assembly. A battery management system (BMS) is arranged inside the battery cell support. The output port of the BMS is located on the front of the battery cell support. The battery cell support has several potting holes. The gaps between the battery cell assembly and the battery compartment, the battery cell assembly and the rear cover, and the battery cell assembly and the battery cell support are designated as potting sections. Adhesive is injected into the potting sections. Sealant is provided between the battery cell support and the battery compartment.

[0006] In some embodiments of this utility model, the front end of the battery compartment is provided with a stepped recess, and the front cover includes an end cover plate and a connecting part thereto. The connecting part is provided corresponding to the stepped recess, and the end cover plate is directly opposite the output port of the BMS.

[0007] In some embodiments of this utility model, the bonding portion is in contact with the cell support, and the end cover plate is integrally formed with the bonding portion.

[0008] In some embodiments of this utility model, the front side of the battery cell bracket is recessed with a groove, and the inner side of the fitting part is provided with a protrusion corresponding to the groove.

[0009] In some embodiments of this utility model, screw holes are provided at the front end of the front cover and the battery compartment, and the screw holes are used to install fastening screws.

[0010] In some embodiments of this utility model, a bracket mounting part is provided inside the battery box corresponding to the cell bracket, and the cell bracket is mounted on the bracket mounting part by a second fastener.

[0011] In some embodiments of this utility model, a limiting recess is provided on the outer side of the rear cover.

[0012] In some embodiments of this utility model, inserts are provided on the inner side of the cell support corresponding to the cell assembly.

[0013] In some embodiments of this utility model, the battery compartment, front cover, and rear cover are all made of aluminum.

[0014] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following advantages:

[0015] Beneficial effects:

[0016] 1. The cell support is equipped with several potting holes, which facilitate the overall potting process of the battery.

[0017] 2. The battery compartment is filled with a gel, which fully fills the filling part, enhancing the battery's drop resistance and waterproof performance. Combined with the high-strength battery compartment made of aluminum, it helps resist impacts, protects the battery, and improves battery safety.

[0018] 3. A sealant is installed between the cell support at the front end of the cell pack and the battery box. The rear cover of the cell pack is welded to the rear of the battery box, which helps to ensure the waterproof and sealing performance of the battery. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the installation of the battery cell support of this utility model;

[0022] Figure 3 This is a schematic diagram of the battery cell support of this utility model;

[0023] Figure 4This is a schematic diagram of the installation of the back cover of this utility model;

[0024] Explanation of key figure labels:

[0025] 1. Battery compartment; 10. Stepped recess; 2. Cell assembly; 3. Rear cover; 30. Limiting recess; 4. Front cover; 40. Fitting part; 41. End cover plate; 5. Cell bracket; 50. Potting hole; 51. Output port; 52. Groove; 53. Insert; 6. Screw hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0028] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0029] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0030] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0031] See the example. Figure 1-4 :

[0032] A waterproof lithium battery casing includes a battery compartment 1, within which a battery cell assembly 2 is housed. A front cover 4 and a rear cover 3 are respectively installed at the front and rear ends of the battery compartment 1. The rear cover 3 is welded to the rear end of the battery compartment 1. A battery cell support 5 is arranged between the front cover 4 and the battery cell assembly 2. A battery management system (BMS) is arranged inside the battery cell support 5. Sealant is applied between the battery cell support 5 and the battery compartment 1. The battery cell support 5 has several potting holes 50. These potting holes 50 facilitate the overall battery potting process. The use of a front-sealing and rear-welding method, combined with overall battery potting, helps resist impacts, ensures the battery's waterproof sealing performance, protects the battery, and improves battery safety.

[0033] The gaps between the cell assembly 2 and the battery compartment 1, the cell assembly 2 and the rear cover 3, and the cell assembly 2 and the cell support 5 are set as the potting section. The glue is poured into the potting section through the potting hole 50. Preferably, during assembly, the rear cover 3 is first welded to the tail of the battery compartment 1, the cell assembly 2 is placed in, the cell support 5 is installed and connected to the BMS, and then the battery compartment 1 is stood up with the front end of the battery compartment 1 facing upward, which facilitates the pouring of the glue and helps to ensure that the glue fully fills the potting section, thereby enhancing the battery's drop resistance and waterproof performance.

[0034] It is understood that the cell assembly 2 is a lithium battery. The potting holes 50 are located on both sides of the cell support 5 and are directly opposite the potting section, and the glue is poured in and reaches the potting section.

[0035] Preferably, the back cover 3 and the battery compartment 1 are welded together using argon arc welding.

[0036] In one embodiment, the BMS output port 51 is located on the front of the cell support 5, the front end of the battery compartment 1 has a stepped recess 10, and the front cover 4 includes an end cover plate 41 and a connected fitting portion 40. The fitting portion 40 is disposed corresponding to the stepped recess 10, and the end cover plate 41 faces the BMS output port 51. Preferably, the cell support 5 is provided with a port hole for placing the BMS output port 51, and the output port 51 faces the end cover plate 41.

[0037] In one embodiment, the end cap 41 and the fitting part 40 are integrally formed.

[0038] In one embodiment, the fitting portion 40 contacts the cell support 5. When the front cover 4 is installed, the fitting portion 40 presses against the cell support 5, thus protecting the cell support 5. Preferably, the front side of the cell support 5 is recessed with a groove 52, and the inner side of the fitting portion 40 is provided with a protrusion corresponding to the groove 52.

[0039] In one embodiment, the front cover 4 and the front end of the battery compartment 1 are respectively provided with screw holes 6, which are used to install fastening screws.

[0040] In one embodiment, the battery compartment 1 is provided with a bracket mounting part corresponding to the cell bracket 5, and the cell bracket 5 is mounted on the bracket mounting part by a second fastener. Preferably, the exposed tip of the second fastener is also covered with sealant.

[0041] In one embodiment, a limiting recess 30 is provided on the outer side of the rear cover 3 to facilitate the installation of the protective shell containing the battery cell assembly 2 in the usage position; specifically, the usage position is the battery placement compartment, and the battery placement compartment is provided with a positioning block corresponding to the limiting recess 30.

[0042] In one embodiment, the inner side of the cell support 5 is provided with a insert 53 corresponding to the cell assembly 2, which facilitates the installation of the cell support 5.

[0043] In one embodiment, the battery compartment 1, the front cover 4, and the rear cover 3 are all made of aluminum, which has high strength and is beneficial for resisting impact and protecting the battery; specifically, the aluminum material is an aluminum alloy.

[0044] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A waterproof casing for a lithium battery, characterized in that: The battery includes a battery box (1), which contains a battery cell assembly (2). A front cover (4) and a rear cover (3) are installed at the front and rear ends of the battery box (1), respectively. The rear cover (3) is welded to the tail of the battery box (1). A battery cell support (5) is arranged between the front cover (4) and the battery cell assembly (2). A BMS is arranged inside the battery cell support (5). The output port (51) of the BMS is located on the front of the battery cell support (5). The battery cell support (5) is provided with several potting holes (50). The gaps between the battery cell assembly (2) and the battery box (1), the battery cell assembly (2) and the rear cover (3), and the battery cell assembly (2) and the battery cell support (5) are set as potting sections. The potting sections are filled with glue. A sealant is provided between the battery cell support (5) and the battery box (1).

2. The waterproof casing for a lithium battery according to claim 1, characterized in that: The battery compartment (1) has a stepped recess (10) at the front end. The front cover (4) includes an end cover plate (41) and a connecting part (40). The connecting part (40) is provided corresponding to the stepped recess (10), and the end cover plate (41) is directly opposite the output port (51) of the BMS.

3. A waterproof casing for a lithium battery according to claim 2, characterized in that: The bonding part (40) is in contact with the cell support (5).

4. A waterproof casing for a lithium battery according to claim 3, characterized in that: The front of the battery cell bracket (5) is recessed with a groove (52), and the inner side of the fitting part (40) is provided with a protrusion corresponding to the groove (52).

5. A waterproof casing for a lithium battery according to claim 1, characterized in that: The front cover (4) and the front end of the battery compartment (1) are respectively provided with screw holes (6), which are used to install fastening screws.

6. A waterproof casing for a lithium battery according to claim 1, characterized in that: The battery box (1) is provided with a bracket mounting part corresponding to the cell bracket (5), and the cell bracket (5) is mounted on the bracket mounting part by a second fastener.

7. A waterproof casing for a lithium battery according to claim 1, characterized in that: The rear cover (3) has a limiting recess (30) on its outer side.

8. A waterproof casing for a lithium battery according to claim 1, characterized in that: The inner side of the cell support (5) is provided with a insert (53) corresponding to the cell assembly (2).

9. A waterproof casing for a lithium battery according to any one of claims 1-8, characterized in that: The battery compartment (1), front cover (4), and rear cover (3) are all made of aluminum.

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