Battery pack liquid cooling plate flow channel structure with fire protection function and method of battery pack liquid cooling plate flow channel structure

Abstract

The invention belongs to the technical field of battery system fire protection, and particularly relates to a battery pack liquid cooling plate runner structure with fire protection and a method thereof, the structure comprises a liquid cooling plate, a fire protection structure is fixedly mounted at the top of the liquid cooling plate, and a heat exchange structure is arranged at the top of the liquid cooling plate and far away from the fire protection structure; the fire fighting structure comprises a fire fighting intervention flow channel, the fire fighting intervention flow channel is formed in an inner cavity of the liquid cooling plate, the top of the liquid cooling plate communicates with a fire fighting liquid inlet pipe, branch flow channels are formed in the inner surface of the fire fighting intervention flow channel, and fire fighting medium spraying holes are formed in the inner surfaces of the branch flow channels. According to the battery pack liquid cooling plate flow channel structure with the fire protection function and the method thereof, the fire protection pipe is inserted into the fire protection liquid inlet pipe, then the combined battery packs are stacked into a battery cabinet, and when the battery packs emit heat, heat is exchanged through flowing of cooling liquid, so that the temperature difference of the battery packs is smaller, the temperature rise is lower, and the service life of the whole battery pack is prolonged; and meanwhile, when the temperature of a single battery pack is abnormal, cooling can be performed immediately.

Description

Technical Field

[0001] The present invention relates to the technical field of battery system fire protection, and in particular to a battery pack liquid cooling plate flow channel structure with fire protection and a method thereof. Background Art

[0002] Due to the advantages of lithium-ion batteries such as large specific capacity, long cycle life, light weight and high performance, they have been extended from the digital 3C field to transportation power, energy storage, communications, robotics and other fields, and their applications are becoming more and more extensive. However, as the performance requirements for lithium-ion batteries become higher and higher, safety factors are becoming more and more prominent. Usually, lithium-ion batteries are prone to thermal runaway under abnormal conditions such as overcharging, over-discharging, internal short circuit, etc., which further cause combustion or even explosion, causing casualties or property losses. In related technologies, the fire extinguishing system is mainly configured separately outside the battery module or packaging package. When a fire alarm occurs, the fire extinguishing system quickly sprays a large amount of water on the battery pack to extinguish the fire or activates a fire extinguisher to extinguish the fire.

[0003] However, in the existing battery system, a fire-fighting structure in which a fire-fighting device is installed on the top of the container is adopted. When a safety problem such as a fire caused by thermal runaway occurs, the fire-fighting system will indiscriminately extinguish the fire according to instructions, causing the entire container (or electric cabinet) to be contaminated by the medium, and a large amount of fire-fighting medium is required. Therefore, in the event of an abnormal fire, the loss caused is all the electric box covers in the entire container (electric cabinet), and the amount of fire-fighting medium required to meet the overall fire-fighting. In this regard, a structure and method for a liquid cooling plate flow channel for heat dissipation of a battery pack with a fire-fighting channel are proposed to achieve fixed-point fire-fighting. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the inventors conducted in-depth research and completed the present invention after paying a lot of creative work.

[0005] Specifically, the technical problem to be solved by the present invention is to provide a battery pack liquid cooling plate flow channel structure with fire protection and a method thereof, so as to solve the technical problem that after the current battery pack catches fire, the fire-fighting equipment will extinguish the entire battery cabinet comprehensively, and it is impossible to extinguish the fire at a specific point on a single battery pack that has heated up and caught fire.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A battery pack liquid cooling plate flow channel structure with fire protection and a method thereof, comprising a liquid cooling plate, a fire protection structure is fixedly installed on the top of the liquid cooling plate, and a heat exchange structure is arranged on the top of the liquid cooling plate and away from the fire protection structure;

[0008] The fire protection structure includes a fire protection intervention flow channel, which is opened in the inner cavity of the liquid cooling plate. The top of the liquid cooling plate is connected to a fire protection liquid inlet pipe, and the bottom end of the fire protection liquid inlet pipe is connected to the inner surface of the fire protection intervention flow channel. The inner surface of the fire protection intervention flow channel is provided with a branch flow channel, and the inner surface of the branch flow channel is provided with a fire protection medium ejection hole.

[0009] As an improved technical solution, the heat exchange structure includes a heat exchange channel, which is opened in the inner cavity of the liquid cooling plate. The top of the liquid cooling plate is connected to a cooling liquid inlet pipe, and a cooling liquid outlet pipe is arranged at the top of the liquid cooling plate and away from the cooling liquid inlet pipe.

[0010] As an improved technical solution, the bottom end of the cooling liquid inlet pipe is connected to the inner surface of the heat exchange channel, and the bottom end of the cooling liquid outlet pipe is connected to the inner surface of the heat exchange channel.

[0011] As an improved technical solution, an electrical box cover is fixedly installed on the top of the liquid cooling plate.

[0012] A battery pack, a battery pack method with fire protection steps:

[0013] S1. After the system detects that the temperature of the battery cells inside the box is abnormal, resulting in thermal runaway, the system controls the fire pipe valve of the upper box of the box to open the channel;

[0014] S2. The fire-fighting medium enters the interior of the liquid cooling plate through the fire-fighting medium inlet, passes through the fire-fighting medium branch channel in the cooling plate, and is sprayed to the electric box cover of the next layer through the fire-fighting medium spraying through hole;

[0015] S3. Due to the high-temperature and high-pressure gas generated by the thermal runaway of the electric box cover, the upper cover of the electric box cover is melted. After the fire-fighting medium is sprayed out from the cold plate of the upper electric box cover, it flows into the thermal runaway electric box cover of the battery cell through the broken hole of the melted upper cover of the lower electric box cover, covering the thermal runaway battery cell, reducing the temperature and isolating oxygen, thereby achieving the effect of fixed-point fire fighting.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The present invention is designed to extinguish fires of battery packs individually by setting up fire passages, and by using fire intervention channels and branch channels in conjunction with fire medium spray outlets and fire liquid inlet pipes, and then by using liquid cooling plates and electric box covers in conjunction with each other, to achieve the effect of extinguishing fires on individual battery packs, thereby preventing firefighting equipment from extinguishing fires on the entire battery cabinet when the battery pack heats up and spontaneously combusts, causing normal battery packs that have not spontaneously combusted to be soaked and unable to be used a second time, thereby reducing the utilization rate of the battery packs.

[0018] 2. The present invention is designed to perform heat exchange on each battery pack through the use of coolant. Through the coordinated use of liquid cooling plates and heat exchange channels with the cooling inlet pipe and the cooling outlet pipe, and then through the coordinated use of multiple liquid cooling plates and the electric box cover, the temperature difference of the battery pack is smaller and the temperature rise is lower, thereby extending the service life of the entire battery pack. At the same time, the battery cells on the inlet side are arranged above different numbers of flow channels. The front end battery cells are greatly affected by the coolant temperature. At this time, the temperature of the battery cells close to the inlet is lower than that of other battery cell areas. Therefore, the number of flow channel cavities can be reduced to avoid waste of resources and reduce the impact caused by the low coolant temperature. The minimum temperature of the battery cells on the inlet side is higher, thereby reducing the maximum temperature on the outlet side and improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the flow channel structure of the liquid cooling plate of a battery pack with fire protection and the method thereof of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the liquid cooling plate and the electric box cover combination of the liquid cooling plate flow channel structure and method of the battery pack with fire protection of the present invention.

[0022] Figure 3 It is a schematic diagram of a three-dimensional cross-sectional structure of a liquid cooling plate of a battery pack liquid cooling plate flow channel structure with fire protection and a method thereof of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional side view structure of the liquid cooling plate of the battery pack liquid cooling plate flow channel structure with fire protection and the method thereof of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the electric box cover of the battery pack liquid cooling plate flow channel structure with fire protection and method thereof of the present invention.

[0025] Description of reference numerals:

[0026] 1. Liquid cooling plate; 2. Fire protection structure; 21. Fire protection intervention flow channel; 22. Fire protection liquid inlet pipe; 23. Branch flow channel; 24. Fire protection medium spray hole; 3. Heat exchange structure; 31. Heat exchange flow channel; 32. Cooling liquid inlet pipe; 33. Cooling liquid outlet pipe; 4. Electric box cover. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0030] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown together, this embodiment provides a battery pack liquid cooling plate flow channel structure with fire protection and a method thereof, the battery pack liquid cooling plate flow channel structure with fire protection and a method thereof include a liquid cooling plate 1, a fire protection structure 2 is fixedly installed on the top of the liquid cooling plate 1, and a heat exchange structure 3 is arranged on the top of the liquid cooling plate 1 and away from the fire protection structure 2;

[0032] The fire protection structure 2 includes a fire protection intervention flow channel 21, which is opened in the inner cavity of the liquid cooling plate 1. The top of the liquid cooling plate 1 is connected to a fire protection liquid inlet pipe 22, and the bottom end of the fire protection liquid inlet pipe 22 is connected to the inner surface of the fire protection intervention flow channel 21. The inner surface of the fire protection intervention flow channel 21 is provided with a branch flow channel 23, and the inner surface of the branch flow channel 23 is provided with a fire protection medium ejection hole 24.

[0033] When a single battery pack valve spontaneously ignites, the fire-fighting liquid sprayed from the fire-fighting medium spray hole 24 will cover the entire battery pack. The battery pack fire-fighting liquid can be quickly released when a fire occurs inside the battery pack to extinguish the fire.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown together, the heat exchange structure 3 includes a heat exchange channel 31, which is opened in the inner cavity of the liquid cooling plate 1. The top of the liquid cooling plate 1 is connected to a cooling liquid inlet pipe 32, and a cooling liquid outlet pipe 33 is arranged at the top of the liquid cooling plate 1 and away from the cooling liquid inlet pipe 32.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown together, the bottom end of the cooling liquid inlet pipe 32 is connected to the inner surface of the heat exchange channel 31 , and the bottom end of the cooling liquid outlet pipe 33 is connected to the inner surface of the heat exchange channel 31 .

[0036] The coolant flows in the heat exchange channel 31, transferring the heat from the high-temperature battery pack to the low-temperature battery pack, making the temperature difference of the battery pack smaller and the temperature rise lower, thereby extending the service life of the entire battery pack. At the same time, by measuring the temperature of the coolant flowing in each battery pack, the effect of abnormal battery pack temperature can be detected.

[0037] like Figure 1 and Figure 5 As shown together, an electrical box cover 4 is fixedly installed on the top of the liquid cooling plate 1.

[0038] The electric box cover 4 and the liquid cooling plate 1 are combined into a whole to form an electric box capable of accommodating a battery pack, and a plurality of electric boxes are stacked together to form a battery cabinet.

[0039] A battery pack, a battery pack method with fire protection steps:

[0040] S1. After the system detects that the temperature of the battery cells inside the box is abnormal, resulting in thermal runaway, the system controls the fire pipe valve of the upper box of the box to open the channel;

[0041] S2. The fire-fighting medium enters the interior of the liquid cooling plate through the fire-fighting medium inlet, passes through the fire-fighting medium branch channel in the cooling plate, and is sprayed to the electric box cover of the next layer through the fire-fighting medium spraying through hole;

[0042] S3. Due to the high-temperature and high-pressure gas generated by the thermal runaway of the electric box cover, the upper cover of the electric box cover is melted. After the fire-fighting medium is sprayed out from the cold plate of the upper electric box cover, it flows into the thermal runaway electric box cover of the battery cell through the broken hole of the melted upper cover of the lower electric box cover, covering the thermal runaway battery cell, reducing the temperature and isolating oxygen, thereby achieving the effect of fixed-point fire fighting.

[0043] During use, the user first places the battery pack into the liquid cooling plate 1 and covers it with the electrical box cover 4, and then inserts the coolant pipes into the cooling inlet pipe 32 and the cooling outlet pipe 33 respectively, so that the coolant can be injected from the cooling inlet pipe 32 into the heat exchange channel 31 and flow out from the cooling outlet pipe 33 for a cycle, and then the fire hose is inserted into the fire inlet pipe 22, and then the assembled battery packs are stacked into a battery cabinet. When the battery pack generates heat, the heat is exchanged out through the flow of coolant, so that the temperature difference of the battery pack is smaller and the temperature rise is lower, thereby extending the service life of the entire battery pack. At the same time, when the temperature of a single battery pack is abnormal, it can be cooled down in the first time. When the battery pack generates heat and ignites spontaneously, the fire liquid will flow into the fire intervention channel 21 through the fire inlet pipe 22, and be sprayed out from the connected branch channel 23 fire medium spray hole 24 to extinguish the battery pack below.

[0044] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or deformations to the present invention, and all of these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A battery pack liquid cooling plate flow channel structure with fire protection, comprising a liquid cooling plate (1), characterized in that: A fire-fighting structure (2) is fixedly mounted on the top of the liquid-cooling plate (1), and a heat exchange structure (3) is arranged on the top of the liquid-cooling plate (1) away from the fire-fighting structure (2); The fire protection structure (2) comprises a fire protection intervention flow channel (21), wherein the fire protection intervention flow channel (21) is provided in the inner cavity of the liquid cooling plate (1), the top of the liquid cooling plate (1) is connected to a fire protection liquid inlet pipe (22), the bottom end of the fire protection liquid inlet pipe (22) is connected to the inner surface of the fire protection intervention flow channel (21), the inner surface of the fire protection intervention flow channel (21) is provided with a branch flow channel (23), and the inner surface of the branch flow channel (23) is provided with a fire protection medium ejection hole (24).

2. The flow channel structure of the battery pack liquid cooling plate with fire protection according to claim 1 is characterized in that: The heat exchange structure (3) comprises a heat exchange channel (31), the heat exchange channel (31) is opened in the inner cavity of the liquid cooling plate (1), the top end of the liquid cooling plate (1) is connected to a cooling liquid inlet pipe (32), and a cooling liquid outlet pipe (33) is arranged at the top end of the liquid cooling plate (1) and away from the cooling liquid inlet pipe (32).

3. The flow channel structure of the battery pack liquid cooling plate with fire protection according to claim 2 is characterized in that: The bottom end of the cooling liquid inlet pipe (32) is connected to the inner surface of the heat exchange channel (31), and the bottom end of the cooling liquid outlet pipe (33) is connected to the inner surface of the heat exchange channel (31).

4. The flow channel structure of the battery pack liquid cooling plate with fire protection according to claim 1 is characterized in that: An electrical box cover (4) is fixedly mounted on the top of the liquid cooling plate (1).

5. A battery pack, characterized in that: The steps of the battery pack method with fire protection as described in any one of claims 1 to 4: S1. After the system detects that the temperature of the battery cells inside the box is abnormal, resulting in thermal runaway, the system controls the fire pipe valve of the upper box of the box to open the channel; S2. The fire-fighting medium enters the interior of the liquid cooling plate through the fire-fighting medium inlet, passes through the fire-fighting medium branch channel in the cooling plate, and is sprayed to the electric box cover of the next layer through the fire-fighting medium spraying through hole; S3. Due to the high-temperature and high-pressure gas generated by the thermal runaway of the electric box cover, the upper cover of the electric box cover is melted. After the fire-fighting medium is sprayed out from the cold plate of the upper electric box cover, it flows into the thermal runaway electric box cover of the battery cell through the broken hole of the melted upper cover of the lower electric box cover, covering the thermal runaway battery cell, reducing the temperature and isolating oxygen, thereby achieving the effect of fixed-point fire fighting.

Images