Soft package power battery pack thermal protection device

Abstract

The utility model belongs to the field of battery pack protection, and relates to a heat protection device for a soft package power battery pack, which comprises a box cover shell, a battery module and a battery pack box body, and the box cover shell is provided with a flexible insulation heat insulation protection pad and a first pressure relief assembly; each battery module is provided with a heat insulation protection pad, a high-temperature insulation heat insulation protection belt and a high-temperature fire-resistant insulation adhesive tape; and the battery pack box body is provided with a second pressure relief assembly and a hard insulating and heat-insulating protective pad. According to the utility model, when the battery cells in the whole pack are in thermal runaway, the heat diffusion to the outside of the battery pack can be greatly reduced, the thermal runaway of the battery pack is effectively inhibited, enough escape time is reserved for passengers, and the thermal safety performance of the battery pack is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack protection, and in particular to a thermal protection device for a soft-pack power battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the thermal safety performance of lithium-ion battery packs, as the core power unit, has become a key technological bottleneck restricting the industry's development.

[0003] Existing pouch battery systems still have significant shortcomings in thermal management design:

[0004] 1. The lack of effective heat conduction path planning at the battery module level leads to the disorderly diffusion of heat inside the module under abnormal operating conditions. This uncontrollable heat propagation can easily trigger a chain thermal runaway reaction.

[0005] 2. Traditional pressure relief valves mostly adopt a single-sided planar arrangement. When thermal runaway is triggered, the high-temperature jet gas does not form a directional guide, causing direct thermal shock to sensitive electrical components.

[0006] 3. Existing thermal protection components often have low integration, which severely restricts the improvement of battery system energy density. Utility Model Content

[0007] The purpose of this invention is to address the problems in thermal protection of pouch batteries in the prior art by proposing a thermal protection device for pouch power battery packs.

[0008] A thermal protection device for a soft-pack power battery pack consists of a cover shell, a battery module, and a battery pack housing. The cover shell is provided with a flexible insulating heat-insulating protective pad and a first pressure relief component.

[0009] The battery module is equipped with a heat-insulating protective pad, a high-temperature insulating heat-insulating protective strip, and a high-temperature fire-resistant insulating tape;

[0010] The battery pack housing is equipped with a second pressure relief assembly and a rigid insulating and heat-resistant protective pad;

[0011] The flexible insulating and heat-insulating protective pad is installed on the inner wall of the flexible insulating and heat-insulating protective pad, and the first pressure relief component is installed at the front end of the outer shell of the box cover.

[0012] The second pressure relief component is located on the side of the battery pack housing, and the rigid insulating and heat-insulating protective pad is located on the upper end of the battery pack housing;

[0013] The battery modules are equipped with heat-insulating protective pads on both sides, high-temperature insulating heat-insulating protective strips are installed on the busbars between the battery modules, and high-temperature fire-resistant insulating tape is installed on the liquid cooling pipes between the battery modules.

[0014] Furthermore, in a thermal protection device for a soft-pack power battery pack, a single second pressure relief component is disposed on the side of the battery pack housing, and two first pressure relief components are disposed on the front end of the housing cover.

[0015] Furthermore, a thermal protection device for a soft-pack power battery pack, wherein the flexible insulating thermal protection pad is made of mica rolls.

[0016] Furthermore, in a thermal protection device for a soft-pack power battery pack, both the second pressure relief component and the first pressure relief component are explosion-proof valves.

[0017] Furthermore, a thermal protection device for a soft-pack power battery pack, wherein the thermal insulation pad is made of composite aerogel.

[0018] Furthermore, a thermal protection device for a soft-pack power battery pack is provided, wherein the outer shell of the box cover, the flexible insulating heat-insulating protective pad, the battery module, the rigid insulating heat-insulating protective pad, and the battery pack box are connected sequentially from top to bottom.

[0019] Furthermore, in a thermal protection device for a soft-pack power battery pack, the high-temperature fire-resistant insulating tape is wrapped around the liquid cooling pipes between the battery modules.

[0020] Furthermore, a thermal protection device for a soft-pack power battery pack includes a flexible insulating heat-insulating protective pad separating the outer casing of the box and the battery module.

[0021] Furthermore, a thermal protection device for a soft-pack power battery pack, wherein the rigid insulating thermal protection pad separates the battery module and the battery pack housing.

[0022] The beneficial effects of this utility model are:

[0023] 1. Enhanced thermal safety performance: Through the multi-level barrier design of the whole package thermal protection device, the heat diffusion path is effectively blocked when the battery cell thermal runaway occurs, the runaway area is controlled within the range of a single module, the speed of heat spread to the outside is slowed down, and passengers are given time to escape in an emergency.

[0024] 2. Space and protection performance optimization: The battery pack's thermal protection structure is distributed in a tiered manner, with a reasonable and compact structure and high space utilization.

[0025] 3. Targeted pressure relief protection mechanism: Pressure relief valves are arranged at both the front and rear of the battery pack, and the opening pressure is consistent, which reduces the thermal shock of high-pressure gas to electrical components;

[0026] 4. Enhanced insulation protection: An insulating protective pad is placed at the bottom of the battery module to prevent arcing between the module and the casing and puncture of the bottom of the casing after thermal runaway of the entire pack. Attached Figure Description

[0027] Figure 1 This is an isometric view of the structure of a thermal protection device for a soft-pack power battery pack.

[0028] Figure 2 An exploded exploded view of a thermal protection device for a soft-pack power battery pack.

[0029] Figure 3 This is an enlarged schematic diagram of the structure of the heat insulation protective pad.

[0030] Figure 4 This is an enlarged schematic diagram of the structure of a high-temperature insulating and heat-resistant protective strip.

[0031] Figure 5 This is an enlarged schematic diagram of the structure of high-temperature fire-resistant insulating tape.

[0032] In the diagram: 1-box cover, 2-flexible insulating heat-insulating protective pad, 3-first pressure relief component, 4-battery module, 5-heat-insulating protective pad, 6-high temperature insulating heat-insulating protective tape, 7-high temperature fire-resistant insulating tape, 8-rigid insulating heat-insulating protective pad, 9-second pressure relief component, 10-battery pack box. Detailed Implementation

[0033] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0034] As attached Figures 1-5 As shown in Specific Embodiment 1, a thermal protection device for a soft-pack power battery pack comprises the following components:

[0035] A thermal protection device for a soft-pack power battery pack includes a cover shell 1, a battery module 4, and a battery pack housing 10;

[0036] The inner wall of the outer shell 1 is fixed with a flexible insulating and heat-insulating protective pad 2 made of mica roll material, and the front end is symmetrically installed with two explosion-proof valves forming the first pressure relief component 3.

[0037] The battery module 4 has heat-insulating protective pads attached to both sides 5, the busbar between modules is wrapped with high-temperature insulating heat-insulating protective tape 6, and the liquid cooling pipe is covered with high-temperature fire-resistant insulating tape 7.

[0038] The battery pack housing 10 has a second pressure relief assembly 9 consisting of a single explosion-proof valve arranged on its side, and a rigid insulating and heat-insulating protective pad 8 installed at the top.

[0039] The components are arranged in layers: the outer shell 1, the flexible insulating and heat-insulating protective pad 2, the battery module 4, the rigid insulating and heat-insulating protective pad 8, and the battery pack box 10 are tightly connected from top to bottom.

[0040] Specific Embodiment 2: The Functional Effect of a Thermal Protection Device for a Soft-Pack Power Battery Pack

[0041] Two explosion-proof valves are symmetrically arranged at the front end of the outer shell 1 of the box cover, and a single explosion-proof valve is set on the left side of the battery pack box 10.

[0042] The flexible insulating and heat-insulating protective pad 2 made of mica rolls is attached to the inner wall of the outer shell 1 of the box cover, separating the box cover from the battery module 4;

[0043] The module is made of composite aerogel to form heat insulation and protective pads 5 on both sides, and rigid insulating heat insulation and protective pads 8 are embedded in the upper groove of the battery pack box 10 and are in rigid contact with the bottom of the module.

[0044] When the battery cell experiences thermal runaway, the first pressure relief component 3 and the second pressure relief component 9 open simultaneously to release high-temperature gas in a directional manner.

[0045] The flexible insulating and heat-insulating protective pad 2 blocks the heat flow from impacting the outer shell 1 of the box cover, protecting the outer shell 1 from failure under high temperature and high pressure and able to withstand the impact of high temperature heat flow.

[0046] The rigid insulating and heat-insulating protective pad 8 prevents the enclosure from being broken down and prevents the enclosure from being damaged or broken down by high-temperature heat flow after thermal runaway, resulting in leakage and other phenomena.

[0047] The thermal insulation pad 5 inhibits heat transfer between modules, reduces heat transfer between modules, and protects adjacent modules in the event of thermal runaway.

[0048] The high-temperature insulating and heat-resistant protective strip 6 protects the busbar of the battery module 4 from arcing after the cell thermal runaway;

[0049] The high-temperature fire-resistant insulating tape 7 resists the impact of high-temperature heat flow after thermal runaway, protecting the liquid cooling pipe of the battery module 4 from failure.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A thermal protection device for a soft-pack power battery pack, comprising a cover shell (1), a battery module (4), and a battery pack housing (10), characterized in that, The outer shell of the box cover (1) is provided with a flexible insulating heat-insulating protective pad (2) and a first pressure relief component (3); The battery module (4) is equipped with a heat insulation protective pad (5), a high temperature insulation heat insulation protective strip (6), and a high temperature fire resistant insulation tape (7). The battery pack housing (10) is equipped with a second pressure relief assembly (9) and a rigid insulating heat-insulating protective pad (8); The flexible insulating heat-insulating protective pad (2) is installed on the inner wall of the flexible insulating heat-insulating protective pad (2), and the first pressure relief component (3) is installed at the front end of the box cover shell (1); The second pressure relief component (9) is disposed on the side of the battery pack housing (10), and the rigid insulating heat-insulating protective pad (8) is disposed on the upper end of the battery pack housing (10); Heat insulation pads (5) are provided on both sides of the battery module (4), high temperature insulation heat insulation protective strips (6) are provided on the busbar between the battery modules (4), and high temperature fire-resistant insulating tapes (7) are provided on the liquid cooling pipes between the battery modules (4).

2. The thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The second pressure relief component (9) is individually disposed on the side of the battery pack housing (10), and the two first pressure relief components (3) are disposed at the front end of the housing cover (1).

3. The thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The flexible insulating and heat-insulating protective pad (2) is made of mica rolls.

4. The thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, Both the second pressure relief component (9) and the first pressure relief component (3) are explosion-proof valves.

5. The thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The heat-insulating protective pad (5) is made of composite aerogel.

6. The thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The outer shell of the box cover (1), the flexible insulating heat protection pad (2), the battery module (4), the rigid insulating heat protection pad (8), and the battery pack box (10) are connected in sequence from top to bottom.

7. A thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The high-temperature fire-resistant insulating tape (7) is wrapped around the liquid cooling pipe between the battery modules (4).

8. The thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The flexible insulating heat-insulating protective pad (2) separates the box cover shell (1) and the battery module (4).

9. A thermal protection device for a soft-pack power battery pack as described in claim 1, characterized in that, The rigid insulating heat-insulating protective pad (8) separates the battery module (4) and the battery pack housing (10).

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