Lithium battery box body with high sealing performance

Abstract

The utility model provides a lithium battery box body with high sealing performance, and relates to the technical field of lithium batteries, a circle of groove is formed in the edge of the top surface of a bottom support, and an insertion piece inserted into the groove is arranged at the bottom of a shell; a plurality of channels are formed in the top face of the bottom support and located at the outer end of the groove, the channels downwards penetrate through the groove to be communicated with the groove, the remaining space in the groove is a glue filling space after the inserting piece is inserted into the groove, sealant is injected into the glue filling space, and a plurality of uneven tooth parts are arranged on the outer surface of the inserting piece. The corner of the inner wall of the bottom support is provided with a hollow groove, the inner end of the hollow groove is provided with an anti-slip strip, the outer end of the hollow groove is provided with an opening communicated with the glue filling space, the depth of the groove is at least one half of the height of the bottom support, and the height of the inserting piece is one half of the height of the groove. A flange face does not need to be arranged on the shell structure, the size of the shell can be reduced, and the utilization rate of actual loading space is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a highly sealed lithium battery housing. Background Technology

[0002] As a new type of energy storage, lithium-ion batteries have been widely used in various new energy storage systems due to their advantages such as high energy density, good safety, light weight, and long cycle life. In particular, lithium-ion power battery systems have become the preferred battery type in the field of electric vehicle energy storage.

[0003] The current sealing design of power battery system battery boxes mainly involves designing flanges for the outer shell and the box cover. The flanges are sealed by compression sealing rings to meet the requirements for outer shell installation. This method requires a large battery pack envelope space, resulting in low utilization of the actual loading space. Furthermore, when the battery is loaded into the outer shell, it is often fully loaded to maximize the effective energy density. In a saturated state, the inner wall of the outer shell is in contact with the battery, which can easily break the battery. In particular, impacts to the battery outer shell during transportation can easily cause explosions and other dangers.

[0004] In summary, this application improves the sealing structure of the battery box. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the inner wall of the outer shell abuts against the battery, which can easily break the battery. In particular, the impact on the battery shell during transportation can easily cause explosions and other dangers. In view of the problems existing in the prior art, a highly sealed lithium battery box is provided.

[0006] The purpose and effects of this utility model are achieved by the following specific technical means:

[0007] A highly sealed lithium battery housing includes a base and an outer shell, which are assembled together to form a housing structure;

[0008] A groove is formed around the top edge of the base, and an insert is provided at the bottom of the outer casing to insert into the groove;

[0009] The top surface of the base is provided with several channels at the outer end of the groove, and the channels extend downward to the groove and communicate with it. After the insert is inserted into the groove, the remaining space in the groove is a filling space. The filling space is filled with sealant, and the outer surface of the insert is provided with several uneven teeth.

[0010] The inner wall corner of the base is provided with a hollow groove, and the inner end of the hollow groove is provided with an anti-slip strip, and the outer end is provided with an opening that communicates with the glue filling space.

[0011] This design uses sealant to secure the connection between the base and the outer shell, with the connection point located inside the base, saving more space compared to traditional flange structures.

[0012] A further preferred embodiment: the depth of the groove is at least half the height of the base, and the height of the insert is half the height of the groove;

[0013] This design is intended to strengthen the connection and prevent it from becoming loose.

[0014] A further preferred embodiment: the channel is L-shaped, and the inner end of the channel is unobstructed and communicates with the glue filling space;

[0015] A rubber plug is provided at the outer end of the channel.

[0016] A further preferred embodiment: the outer surface of the insert is provided with screw holes at positions corresponding to the outer wall of the base, and bolts are connected in the screw holes;

[0017] The bolts are inserted into the sealant, and the bolt design is to further tighten the connection on the basis of the sealant, locking the inside of the insert.

[0018] A further preferred embodiment: The anti-slip strip protrudes at least 2mm from the inner wall of the base, and the surface of the anti-slip strip is provided with several small particles. With this design, after the sealant is injected into the hollow groove, the anti-slip strip will expand and protrude further from the inner wall of the base, moving closer to the battery structure, thereby resisting the battery structure and preventing the battery structure from being broken by contacting the relatively hard base structure.

[0019] The beneficial effects of this utility model are:

[0020] 1. After the bolts are locked, sealant is injected. The sealant will wrap around the bolts, and after cooling, the sealant will hold the bolt threads in place, preventing the bolts from coming out of the bolt holes. This eliminates the need for bolt washers and achieves the anti-loosening effect. Using sealant instead of traditional flange connections eliminates the need for flange faces on the outer shell structure, reducing the size of the outer shell and improving the utilization rate of the actual loading space.

[0021] 2. The anti-slip strip protrudes and can hold the battery structure. Because the anti-slip strip is relatively soft and has several small particles on its surface, it is not easily damaged when holding the battery structure. The anti-slip strip is ≥0.4cm thick and has a thick wall, making it not easy to break. After the sealant solidifies, the anti-slip strip can remain in an expanded and protruding state to protect the battery structure. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram showing the disassembled structure of the base and outer shell of this utility model;

[0025] Figure 3 This utility model Figure 2 A magnified schematic diagram of the structure at point A in the diagram;

[0026] Figure 4 This is a partial planar schematic diagram (front view) of the base and insert structure of this utility model.

[0027] Figure 5 This is a partial planar schematic diagram (front view) of the base and insert structure of this utility model.

[0028] Figures 1-5 In the middle: base (1), groove (101), channel (2), rubber plug (201), opening (3), anti-slip strip (4), hollow groove (401), shell (5), insert (501), tooth (502), screw hole (6), bolt (7). Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely examples for implementing this utility model. It must be pointed out that the disclosed embodiments do not limit the scope of this utility model. On the contrary, any modifications and refinements made without departing from the scope of this utility model are within the patent protection scope of this utility model.

[0030] Please see Figures 1-4 A highly sealed lithium battery housing includes a base 1 and a shell 5, which are assembled together to form a housing structure, and the base 1 carries various battery structures.

[0031] A groove 101 is formed around the top edge of the base 1 (e.g., Figure 3 As shown, the groove 101 is opened inside the base 1 and will not occupy the space of the base 1. The bottom of the outer shell 5 is provided with an insert 501 for inserting into the groove 101. When installing the base 1 and the outer shell 5, align the insert 501 with the groove 101 and then move the outer shell 5 down. The insert 501 will penetrate into the groove 101.

[0032] Furthermore, the depth of the groove 101 is at least half the height of the base 1, and the height of the insert 501 is half the height of the groove 101. This design ensures that the insert 501 penetrates at least half of the groove 101, preferably three-quarters deep. The groove 101 is preferably 20%-40% of the total height of the outer casing 5, making it less prone to collapse when the lithium battery casing 5 is laid flat, especially suitable for vertical battery boxes (such as...). Figure 1 (As shown).

[0033] Please see Figure 1 and Figure 2 , Figure 4 and Figure 5 The top surface of the base 1 has several channels 2 located at the outer end of the groove 101, and the channels 2 extend downwards to communicate with the groove 101. After the insert 501 is inserted into the groove 101, the remaining space in the groove 101 is a filling space. The channels 2 are L-shaped (e.g., ...). Figure 5 As shown), and the inner end of channel 2 is unobstructed and communicates with the filling space. After the insert 501 is inserted into the groove 101, sealant can be injected into the opening 3 of channel 2. There are several channels 2. To improve the injection efficiency, more channels 2 can be opened for injection (e.g. Figure 2 As shown), the sealant spreads rapidly in the filling space. As the sealant overflows into the filling space, the space is gradually filled. Observe the sealant at the top opening of channel 2. If it is close to opening 3, stop the injection. Then let the outer shell 5 stand for 8-12 hours. After the sealant has completely cooled and hardened, a plug 201 is provided at the outer end of channel 2 to block it. The outer surface of the insert 501 has several uneven teeth 502. The sealant can hold the teeth 502 of the insert 501 in place (e.g., ...). Figure 4 As shown), this prevents the insert 501 from dislodging from the groove 101, thus completing the installation with the base 1;

[0034] Furthermore, the outer surface of the insert 501 is provided with screw holes 6 at positions corresponding to the outer wall of the base 1, and bolts 7 are connected to the screw holes 6 (e.g., Figure 5 As shown), after the insert 501 is inserted into the groove 101, the screw holes 6 correspond to each other. Before applying glue, the bolt 7 can be screwed into the screw hole 6. The inner end of the bolt 7 will lock into the screw hole 6 of the insert 501, thereby locking the insert 501 and the base 1 together. This bolt 7 and screw hole 6 structure can be set in multiple sets (e.g., Figure 2 As shown), it is preferably set on the four sides of the base 1 and the insert 501, which can fix the connection between the outer shell 5 and the base 1 on four sides. After the bolt 7 is locked, the sealant is injected. The sealant will wrap the bolt 7. After the sealant cools, it will hold the thread of the bolt 7. The bolt 7 cannot come out of the threaded hole 6. The bolt 7 gasket can be omitted to achieve the anti-loosening effect. The use of sealant to replace the traditional flange connection does not require the flange face to be set on the structure of the outer shell 5. The volume of the outer shell 5 can be reduced and the utilization rate of the actual loading space can be improved.

[0035] Please see Figures 1-4 The inner wall corner of the base 1 is provided with a hollow groove 401, and the inner end of the hollow groove 401 is provided with an anti-slip strip 4, and the outer end is provided with an opening 3 communicating with the filling space. When injecting sealant, the sealant in the filling space will flow into the hollow groove 401 through the opening 3, and as the amount of sealant injected increases, more sealant will be filled into the hollow groove 401 (e.g., Figure 4As shown), the anti-slip strip 4 protrudes at least 2mm from the inner wall of the base 1 until the sealant is filled. The anti-slip strip 4 is made of silicon dioxide with a heat resistance of ≥200°. The temperature of the sealant injected into the filling space in liquid state is 60°-150°. After the sealant enters the hollow groove 401, the anti-slip strip 4 will expand and bulge out by about 1cm, so that the anti-slip strip 4 is close to the battery structure in the base 1. When laying out the battery structure, those skilled in the art can place the battery structure at a position 1cm away from the inner wall of the base 1. After the anti-slip strip 4 protrudes, it can hold against the battery structure. Because the anti-slip strip 4 is relatively soft and has several small particles on its surface, it is not easy to damage the battery structure when it holds against it. The anti-slip strip 4 is ≥0.4cm thick and has a relatively thick wall, so it is not easy to break. After the sealant solidifies, the anti-slip strip 4 can maintain its expanded and protruding state to protect the battery structure.

Claims

1. A highly sealed lithium battery casing, comprising a base and an outer shell, which are assembled together to form a casing structure, characterized in that: A groove is formed around the top edge of the base, and an insert is provided at the bottom of the outer casing to insert into the groove; The top surface of the base is provided with several channels at the outer end of the groove, and the channels extend downward to the groove and communicate with it. After the insert is inserted into the groove, the remaining space in the groove is a filling space. The filling space is filled with sealant, and the outer surface of the insert is provided with several uneven teeth. The inner wall corner of the base is provided with a hollow groove, and the inner end of the hollow groove is provided with an anti-slip strip, and the outer end is provided with an opening that communicates with the glue filling space.

2. The high-sealing lithium battery housing according to claim 1, characterized in that: The groove depth is at least half the height of the base, and the height of the insert is half the height of the groove.

3. The high-sealing lithium battery casing according to claim 1, characterized in that: The channel is L-shaped, and its inner end is unobstructed and communicates with the filling space; A rubber plug is provided at the outer end of the channel.

4. The high-sealing lithium battery housing according to claim 1, characterized in that: The outer surface of the insert is provided with screw holes at positions corresponding to the outer wall of the base, and bolts are connected in the screw holes; The bolts are inserted into the sealant.

5. A high-sealing lithium battery casing according to claim 1, characterized in that: The anti-slip strip protrudes at least 2mm from the inner wall of the base, and the surface of the anti-slip strip is provided with several small particles.

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