Lower plastic of battery

Abstract

The utility model provides lower plastic of a battery, a liquid injection channel and a discharge channel are arranged in the middle of the surface of the lower plastic, a first sinking groove is arranged on the upper surface of the lower plastic, a second sinking groove is arranged on the bottom wall of the first sinking groove, a through liquid injection hole is arranged on the bottom surface of the second sinking groove, and a plurality of through liquid guide grooves are arranged on the side wall of the second sinking groove. The liquid injection channel and the drainage channel are communicated through the drainage grooves, the liquid guide grooves in the liquid injection channel are communicated with the grooves in the drainage channel, the drainage channel is communicated with the drainage grooves in the drainage channel, the drainage channel is communicated with the drainage grooves in the drainage channel, the drainage channel is communicated with the drainage channel, and the drainage channel is communicated with the drainage channel in the drainage channel. When the anti-explosion valve is opened due to thermal runaway, gas and heat generated by thermal runaway of the battery can be subjected to air pressure and heat diffusion through the drainage groove, the strip-shaped groove and the flow guide hole, the pressure relief paths are multiple, the gas can be guided out or discharged in time, and the problem that the battery is still subjected to thermal runaway when the valve is opened is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion batteries, and in particular to a plastic material under a battery. Background Technology

[0002] In the prior art, the insulating component installed below the top cover of the battery is generally referred to as the lower plastic. The lower plastic is placed between the top cover and the bare cell to prevent short circuits between the bare cell and the top cover.

[0003] The lower plastic is usually assembled to the bottom of the top cover plate by interference fit. In order to increase the capacity of the battery cell, the distance between the lower plastic and the battery cell is getting closer and closer. When the explosion-proof valve opens due to thermal runaway, most of the gas and heat generated by the thermal runaway of the battery can only be diffused through the lower plastic connection part at the explosion-proof valve. However, the lower plastic venting protrusion at the explosion-proof valve is usually blocked by the bare battery cell, so it cannot release pressure and remove heat in time. If the gas is not discharged or vented in time, it may cause the battery to explode.

[0004] To address this issue, we propose a method for using a lower plastic layer in the battery to resolve the problem of untimely venting and pressure relief at the explosion-proof valve port of the lower plastic layer. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology. To achieve the above objective, this utility model adopts the following technical solution:

[0006] A battery lower plastic includes a lower plastic, wherein an injection channel and a drain channel are formed in the middle of the surface of the lower plastic. The injection channel includes a sink first, a sink second, an injection hole and a guide groove. The sink first is formed on the upper surface of the lower plastic. The sink second is formed on the bottom wall of the sink first. The bottom surface of the sink second has a through injection hole. Several through guide grooves are formed on the side wall of the sink second.

[0007] The discharge channel includes a baffle and a groove. The horizontal position of the upper surface of the baffle is lower than the horizontal position of the upper surface of the lower plastic. A through strip groove is formed on both sides of the baffle surface. A groove is formed on the lower plastic surface on both sides of the baffle. A through guide hole is formed on the bottom wall of the groove. The baffle and the upper surface of the lower plastic maintain an appropriate distance, that is, the distance between the baffle and the explosion-proof valve. On the one hand, it prevents the explosion-proof valve from directly contacting the lower plastic baffle during vibration. On the other hand, it reduces the space between the explosion-proof valve and the lower plastic. The upper surface of the baffle is a conical surface that slopes from the center to the edge. The inclined conical surface facilitates the flow of electrolyte to the edge, reducing the accumulation of electrolyte during the drop test. This greatly weakens the impact of free electrolyte energy conversion on the explosion-proof valve and reduces the risk of the explosion-proof valve opening during the drop test.

[0008] More preferably, the surface of the baffle is a conical surface, and the conical surface is inclined towards the edge with the center position as the midpoint.

[0009] A further preferred embodiment includes a drainage channel, which is formed between the sink and the recess, and the drainage channel connects the sink and the recess.

[0010] More preferably, the lower plastic surface is provided with a plurality of positioning posts, and the positioning posts are adjacent to the edge of the lower plastic body.

[0011] More preferably, the lower plastic surface has two pole mounting holes distributed on both sides of the lower plastic.

[0012] More preferably, the bottom of the lower plastic is provided with protrusions on both sides, and the upper surface of the lower plastic is provided with square grooves at the protrusions, and the square grooves are provided with two through guide holes.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] The liquid injection channel and the drain channel of this utility model are connected by a drainage groove, so that the several liquid guide grooves on the liquid injection channel and the grooves on the drain channel are connected. When the explosion-proof valve opens due to thermal runaway, the gas and heat generated by the thermal runaway of the battery can be diffused through the drainage groove, the strip groove and the guide hole at one point for gas pressure and heat diffusion. It has multiple pressure relief paths, which can timely export or discharge the gas, effectively solving the problem of thermal runaway still occurring when the battery valve is opened. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front structure of this utility model. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the front structure of this utility model. Figure 2 ;

[0017] Figure 3 This is a schematic diagram of the rear structure of this utility model.

[0018] In the diagram: 1. Lower plastic, 2. Electrode mounting hole, 3. Injection channel, 4. Drainage channel, 5. Positioning post, 6. Square groove, 31. Settling tank 1, 32. Settling tank 2, 33. Injection hole, 34. Liquid guide groove, 35. Drainage groove, 41. Baffle, 42. Groove, 411. Drainage hole 1, 421. Drainage hole 2, 61. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figures 1-3 A battery lower plastic includes a lower plastic 1. An injection channel 3 and a drain channel 4 are provided in the middle of the surface of the lower plastic 1. The injection channel 3 includes a first sink 31, a second sink 32, an injection hole 33, and a guide groove 34. The first sink 31 is provided on the upper surface of the lower plastic 1. The second sink 32 is provided on the bottom wall of the first sink 31. The bottom surface of the second sink 32 has a through injection hole 33. Several through guide grooves 34 are provided on the side wall of the second sink 32.

[0021] In this embodiment, several through-type liquid guiding grooves 34 are provided on the side wall of the settling tank 32. The liquid guiding grooves 34 are connected to the discharge channel 4 through the diversion groove 35. When the explosion-proof valve opens due to thermal runaway, the gas and heat generated by the battery thermal runaway can be diffused through the discharge channel 4 and the liquid guiding grooves 34. With multiple pressure relief paths, the gas can be discharged or released in time, effectively solving the problem of thermal runaway still occurring when the battery valve is opened.

[0022] The discharge channel 4 includes a baffle 41 and a groove 42. The horizontal position of the upper surface of the baffle 41 is lower than the horizontal position of the upper surface of the lower plastic. A through strip groove 411 is provided on both sides of the surface of the baffle 41. A groove 42 is provided on the surface of the lower plastic and on both sides of the baffle 41. A through guide hole 421 is provided on the bottom wall of the groove 42.

[0023] In the embodiment: the baffle and the upper surface of the lower plastic are kept at an appropriate distance, that is, the distance between the baffle and the explosion-proof valve. On the one hand, this prevents the explosion-proof valve from directly contacting the lower plastic baffle during vibration. On the other hand, the space between the explosion-proof valve and the lower plastic is reduced, which reduces the accumulation of electrolyte during the drop test and greatly weakens the impact of free electrolyte energy conversion on the explosion-proof valve. This reduces the risk of the explosion-proof valve opening during the drop test.

[0024] The surface of the baffle 41 is a conical surface, which is inclined towards the edge with the center position as the midpoint.

[0025] In the embodiment: the upper surface of the baffle 41 is a conical surface that slopes towards the edge with the center position as the midpoint. The inclined conical surface facilitates the flow of electrolyte towards the edge. The strip groove 411 on the baffle can not only reduce the accumulation of electrolyte between the lower plastic and the explosion-proof valve, but also accelerate the backflow of electrolyte accumulated between the lower plastic and the explosion-proof valve. This reduces electrolyte accumulation, greatly weakens the impact of free electrolyte energy conversion on the explosion-proof valve, and reduces the risk of the explosion-proof valve opening.

[0026] It also includes a diversion channel 35, which is formed between the sink 31 and the groove 42, and the diversion channel 35 connects the sink 31 and the groove 42.

[0027] In the embodiment: the diversion groove 35 connects the liquid injection channel 3 and the discharge channel 4, increasing its pressure relief path so that the gas can be discharged or released in a timely manner, effectively solving the problem of thermal runaway still occurring when the battery valve is opened.

[0028] The surface of the lower plastic 1 is provided with a plurality of positioning posts 5, and the positioning posts 5 are close to the edge of the lower plastic body.

[0029] In the embodiment: the positioning post 5 is a T-shaped structure, and is positioned and snapped into the top cover.

[0030] The lower plastic 1 has two pole mounting holes 2 on its surface, which are distributed on both sides of the lower plastic 1.

[0031] In the embodiment: one is a positive terminal mounting hole, and the other is a negative terminal mounting hole.

[0032] The bottom of the lower plastic 1 is provided with protrusions on both sides, and a square groove 6 is provided on the upper surface of the lower plastic 1 at the protrusions. The square groove 6 is provided with a through guide hole 61.

[0033] In the embodiment: the bottom of the boss abuts against the bare battery cell, and the square grooves 6 are evenly distributed on both sides of the lower plastic 1. When gas or liquid enters between the lower plastic 1 and the top cover, the square grooves 6 cooperate with the internal guide holes 61 to realize the function of venting and draining liquid inside the battery.

[0034] The liquid injection channel and the drain channel of this utility model are connected by a drainage groove, so that the several liquid guide grooves on the liquid injection channel and the grooves on the drain channel are connected. When the explosion-proof valve opens due to thermal runaway, the gas and heat generated by the thermal runaway of the battery can be diffused through the drainage groove, the strip groove and the guide hole at one point for gas pressure and heat diffusion. It has multiple pressure relief paths, which can timely export or discharge the gas, effectively solving the problem of thermal runaway still occurring when the battery valve is opened.

Claims

1. A type of plastic under a battery, characterized in that, The device includes a lower plastic material, on the middle of which an injection channel and a drain channel are provided. The injection channel includes a sink 1, a sink 2, an injection hole, and a guide channel. The sink 1 is located on the upper surface of the lower plastic material. The sink 2 is located on the bottom wall of the sink 1. The bottom surface of the sink 2 has a through injection hole. Several through guide channels are provided on the side wall of the sink 2. The discharge channel includes a baffle and a groove. The horizontal position of the upper surface of the baffle is lower than the horizontal position of the upper surface of the lower plastic. A through strip groove is provided on both sides of the surface of the baffle. A groove is provided on the surface of the lower plastic located on both sides of the baffle. A through guide hole is provided on the bottom wall of the groove.

2. The battery under-body plastic according to claim 1, characterized in that, The surface of the baffle is a cone, and the cone is inclined towards the edge with the center position as the midpoint.

3. The battery under-body plastic according to claim 2, characterized in that, It also includes a drainage channel, which is formed between the sink and the groove, and the drainage channel connects the sink and the groove.

4. The battery under-body plastic according to claim 2, characterized in that, The lower plastic surface is provided with a number of positioning posts, and the positioning posts are close to the edge of the lower plastic body.

5. The battery under-body plastic according to claim 1, characterized in that, The lower plastic surface has two electrode mounting holes, which are distributed on both sides of the lower plastic.

6. The battery under-body plastic according to claim 1, characterized in that, The bottom of the lower plastic is provided with protrusions on both sides, and a square groove is provided on the upper surface of the lower plastic at the protrusion. The square groove is provided with a through guide hole.

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