Battery cell structure

Abstract

The utility model provides a battery cell structure which comprises a shell and a roll core, and the roll core is accommodated in the shell; the water heater is characterized in that the water heater further comprises a flow collecting disc, an elastic piece, an inner pipe and an isolating membrane, and the flow collecting disc is electrically connected with the roll core; the elastic piece is arranged between the flow collecting disc and the inner wall of the shell; the inner pipe is filled with a fire fighting medium, the two ends of the inner pipe are sealed through the isolating membranes respectively, and the roll core is wound on the inner pipe. One end of the inner pipe is connected with the flow collecting disc, and the other end of the inner pipe abuts against the inner wall of the shell. The inner pipe is filled with the fire-fighting medium, and the end part of the inner pipe is sealed and is propped against the inner wall of the shell for protection, so that the end part of the inner pipe can be exposed only when the battery is subjected to thermal runaway and the pressure is increased, the flow collecting disc is jacked to displace and the elastic piece is compressed, and then the sealing film is burst open by air pressure to overflow the fire-fighting medium; the structure has the advantages that the sealing film can be set to be larger, and the battery can be easily burst open.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, in particular to a battery core structure. Background Art

[0002] The existing battery cooling and heat dissipation methods mainly use water cooling components such as water cooling plates to dissipate heat, or use air cooling components such as fans to dissipate heat. However, the above methods all achieve heat dissipation through heat conduction, which has the problem of low heat dissipation efficiency. At the same time, in the early stage of battery thermal runaway, the above heat dissipation methods cannot achieve the inhibitory effect on battery thermal runaway, so it is necessary to set up a fire protection structure for the battery.

[0003] The invention patent application with the existing application publication number CN116544569A discloses a battery, a battery pack and an electrical device, wherein the battery includes a shell, a winding core, a column, a first membrane and a second membrane, the shell is provided with an inner cavity, the winding core is assembled in the inner cavity of the shell, the column is supported in the winding core to prevent the winding core from collapsing, the column is provided with a first cavity for storing a lithium supplement medium and a second cavity for storing a fire-fighting medium, the cavity wall of the first cavity is provided with a first hole, the cavity wall of the second cavity is provided with a second hole, the first membrane blocks the first hole, the first membrane ruptures when subjected to a first pressure so that the lithium supplement medium in the first cavity can flow into the inner cavity through the first hole, the second membrane blocks the second hole, the second membrane ruptures when subjected to a second pressure so that the fire-fighting medium in the second cavity can flow into the inner cavity through the second hole, and the second pressure is greater than the first pressure.

[0004] As in the above technical solution, a hollow cylinder is set in the battery to accommodate the firefighting medium. After the membrane on the cylinder is ruptured under pressure, the firefighting medium overflows to suppress the fire inside the battery. However, in this structure, there are many holes on the cylinder, which results in a small area of ​​the membrane used to seal the holes. It is not easy to rupture after being compressed, making it difficult for the firefighting medium to overflow, which will affect the firefighting function of the battery to a certain extent, and there are also problems of design and production difficulties. Utility Model Content

[0005] In view of this, the utility model proposes a battery cell structure which is convenient for fire-fighting medium to overflow, simple in structure and easy to design and produce, so as to solve the problems in existing battery cells that the sealing film is not easy to rupture, the fire-fighting medium is difficult to overflow and the design and production are difficult.

[0006] The technical solution of the utility model is implemented as follows: the utility model provides a battery core structure, including a body and a winding core, wherein the winding core is accommodated inside the shell;

[0007] It also includes a collecting plate, an elastic member, an inner tube and an isolation membrane, wherein:

[0008] The current collecting plate is electrically connected to the winding core;

[0009] The elastic member is arranged between the collecting plate and the inner wall of the shell;

[0010] The inner tube is filled with firefighting medium, and both ends of the inner tube are sealed by an isolation membrane, and the winding core is wound on the inner tube;

[0011] One end of the inner tube is connected to the current collecting plate, and the other end is supported on the inner wall of the shell.

[0012] On the basis of the above technical solution, preferably, the elastic member is a fluid-permeable member, one end of the elastic member is connected to the inner wall of the shell, and the other end is connected to the collecting plate.

[0013] On the basis of the above technical solution, preferably, two inner tubes are arranged in the shell, and one end of each of the two inner tubes is connected to each other, the end of one inner tube is connected to the collecting plate, and the end of the other inner tube is connected to the inner wall of the shell.

[0014] On the basis of the above technical solution, preferably, two current collecting plates and two elastic members are provided in the housing;

[0015] Two inner tubes are arranged in the shell, one end of each of the two inner tubes is connected to each other, and the other ends of the two inner tubes are installed and fixed through the collecting plate and the elastic member.

[0016] On the basis of the above technical solution, preferably, the two isolation membranes on the opposite ends of the two inner tubes are connected by glue dispensing.

[0017] On the basis of the above technical solution, preferably, the two inner tubes are of equal length.

[0018] On the basis of the above technical solution, preferably, the two inner tubes are interconnected.

[0019] On the basis of the above technical solution, preferably, the shell includes a cylinder and an end cover, wherein:

[0020] The winding core and the inner tube are arranged in the cylinder;

[0021] An end cap is provided at each end of the cylinder to seal the cylinder;

[0022] The elastic member is arranged between the collecting plate and the end cover.

[0023] On the basis of the above technical solution, preferably, it further comprises a hose, a through hole is opened on the end cover, and one end of the inner tube connected to the collecting plate is connected to the hose;

[0024] The other end of the hose is connected to the end cover and communicates with the through hole.

[0025] On the basis of the above technical solution, preferably, the isolation membrane is arranged on the end cover to seal the through hole.

[0026] The battery cell structure of the utility model has the following beneficial effects compared with the prior art:

[0027] (1) Firefighting medium is filled in the inner tube, and the end of the inner tube is sealed and pressed against the inner wall of the shell for protection. In this way, only when the battery has thermal runaway and the pressure increases, the collector plate is pushed and displaced, and the end of the inner tube is exposed after the elastic member is compressed. Then, the air pressure breaks the sealing film and the firefighting medium overflows, thereby achieving firefighting of the battery. This structure has the advantages that the sealing film can be set larger and is easy to be broken open, and is easy to design and produce;

[0028] (2) The elastic member is set as a fluid flow, so that the current can be conducted without the need to set up additional conductive components for electrical connection of the winding core, which is conducive to simplifying the battery cell structure;

[0029] (3) By setting two inner tubes and bonding the sealing films at the connecting ends of the two inner tubes by glue dispensing, the sealing films can be torn during the displacement of the inner tubes driven by the collecting plate, thereby eliminating the need for pressure to break the sealing films, further improving the reliability of the application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a three-dimensional diagram of the battery core structure of the utility model;

[0032] Figure 2 An exploded diagram of the battery cell structure of the utility model;

[0033] Figure 3 It is a front view of the battery core structure of the utility model;

[0034] Figure 4 For the utility model Figure 3 Middle AA section view;

[0035] Figure 5 A cross-sectional view of a battery cell structure of the utility model with two inner tubes;

[0036] Figure 6 It is a structural diagram of the current collecting plate and elastic member layout of the battery core structure of the utility model;

[0037] In the figure: 1, shell; 11, cylinder; 12, end cover; 101, through hole; 2, winding core; 3, collecting plate; 4, elastic member; 5, inner tube; 6, isolation membrane; 7, hose. DETAILED DESCRIPTION

[0038] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] like Figures 1 to 6 As shown, the battery cell structure of the utility model includes a shell 1, a winding core 2, a current collecting plate 3, an elastic member 4, an inner tube 5, an isolation membrane 6 and a hose 7.

[0040] like Figures 1 to 4 As shown, the collecting plate 3 is electrically connected to the winding core 2; the elastic member 4 is arranged between the collecting plate 3 and the inner wall of the shell 1; the inner tube 5 is filled with a firefighting medium, and both ends of the inner tube 5 are sealed by an isolation film 6, and the winding core 2 is wound on the inner tube 5; one end of the inner tube 5 is connected to the collecting plate 3, and the other end is abutted against the inner wall of the shell 1;

[0041] As in the above structure, the inner tube 5 is filled with a firefighting medium, which is used to extinguish the battery cell. When the battery is used for too long or the internal pressure increases in the early stage of thermal runaway, the collector plate 3 will be pushed to move. At this time, the elastic member 4 is compressed, and the inner tube 5 also moves with the collector plate 3. The end of the inner tube 5 that is against the inner wall of the shell 1 moves away from the inner wall, exposing the isolation membrane 6. As the pressure continues to increase, the isolation membrane 6 will be opened, and then the firefighting medium in the inner tube 5 will overflow, realizing immersion firefighting.

[0042] like Figure 4 and Figure 6 As shown, the elastic member 4 is a fluid-passing member, one end of the elastic member 4 is connected to the inner wall of the housing 1, and the other end is connected to the collecting plate 3;

[0043] As in the above structure, in some batteries, the battery shell is directly used as an electrode, so a fluid is used as the elastic member 4, which can limit the collecting plate 3 while also transmitting current, which is beneficial to simplify the structure of the battery cell.

[0044] like Figure 5 As shown, two inner tubes 5 are provided in the housing 1, and one end of each of the two inner tubes 5 is connected to each other, wherein the end of one inner tube 5 is connected to the collecting plate 3, and the end of the other inner tube 5 is connected to the inner wall of the housing 1;

[0045] As in the above structure, when two inner tubes 5 are provided, as the inner tube 5 connected to the collecting plate 3 moves, one end of each of the two inner tubes 5 is exposed, and then under the action of pressure, the isolation membrane 6 at the end is broken, allowing the fire fighting medium to overflow.

[0046] Specifically, the fire-fighting medium may be perfluoroacetone.

[0047] like Figure 5 As shown, two current collecting plates 3 and two elastic members 4 are provided in the housing 1; two inner tubes 5 are provided in the housing 1, one end of each of the two inner tubes 5 is connected to each other, and the other ends of the two inner tubes 5 are fixedly mounted through the current collecting plates 3 and the elastic members 4;

[0048] As in the above structure, when two inner tubes 5 are provided, two collecting plates 3 and elastic members 4 can be adaptively provided for movement of the two inner tubes 5, thereby increasing the separation speed and separation distance of the two inner tubes 5 so that the firefighting medium can overflow better.

[0049] It should be noted that the housing 1 is divided into two parts, the two parts of the housing 1 are insulated and connected, and each is connected to an elastic member 4 to prevent short circuit problems.

[0050] Furthermore, the two isolation membranes 6 on the opposite ends of the two inner tubes 5 are connected by glue dispensing;

[0051] As in the above structure, after the isolation membrane 6 at the ends of the two inner tubes 5 are connected by glue, the collecting plate 3 and the inner tube 5 only need to rely on pressure to move. As the two inner tubes 5 separate, the isolation membrane 6 will be torn to allow the fire-fighting medium to overflow. At this time, there is no need for pressure to break through the isolation membrane 6, thereby improving the reliability of the application.

[0052] In some embodiments, the two inner tubes 5 are interconnected;

[0053] As in the above structure, in this structure, only the relatively far ends of the two inner tubes 5 are sealed by the isolation membrane 6, while the relatively connected ends are connected. At this time, when the collecting plate 3 and the inner tubes 5 are moved under the action of pressure, the fire-fighting medium will overflow as soon as the two inner tubes 5 are separated, and there is no need to wait for the pressure to break through the isolation membrane 6, thereby improving the reliability of the application.

[0054] In some embodiments, the two inner tubes 5 are of equal length;

[0055] In some embodiments, the two inner tubes 5 have different lengths. This is because the battery cells are generally placed vertically, and the firefighting medium in the upper inner tube 5 can be more easily overflowed, so the inner tube 5 located on the upper side can be set longer.

[0056] like Figure 1 and Figure 2The shell 1 includes a cylinder 11 and an end cover 12, wherein the winding core 2 and the inner tube 5 are arranged in the cylinder 11; one end cover 12 is arranged at each end of the cylinder 11 to seal the cylinder 11; and the elastic member 4 is arranged between the collecting plate 3 and the end cover 12.

[0057] As in the above structure, the end cap 12 is used as the electrode terminal of the battery cell. In this case, the end cap 12 is insulated from the cylinder 11 to prevent short circuit. The winding core 2 is electrically connected to the end cap 12 through the collecting plate 3 and the elastic member 4.

[0058] like Figure 4 As shown, a through hole 101 is opened on the end cover 12, and one end of the inner tube 5 connected to the collecting plate 3 is connected to the hose 7; the other end of the hose 7 is connected to the end cover 12 and connected to the through hole 101;

[0059] As in the above structure, in order to facilitate the injection of fire-fighting medium into the inner tube 5, a through hole 101 is opened on the end cover 12, and a hose 7 is provided to connect the through hole 101 with the inner tube 5. Under such a structure, the fire-fighting medium can be injected into the inner tube 5 after the battery assembly is completed. Since the inner tube 5 is connected to the end cover 12 through the hose 7, when the collecting plate 3 drives the inner tube 5 to move, the hose 7 will be compressed and deformed to prevent the movement of the inner tube 5 from being affected.

[0060] Furthermore, the isolation membrane 6 is disposed on the end cover 12 to seal the through hole 101 .

[0061] In some embodiments, a plugging cover may be provided to seal the through hole 101 of the end cover 12 .

[0062] Specific implementation steps:

[0063] In the later stage of battery cell use, or in the early stage of thermal runaway, when the internal pressure increases, the collecting plate 3 is pushed to move. At this time, the elastic member 4 and the hose 7 are compressed, and the inner tube 5 moves with the collecting plate 3. The pressure continues to increase and breaks through the isolation membrane 6, and the fire-fighting medium overflows to carry out immersion fire-fighting work.

[0064] When two inner tubes 5 are provided and the two inner tubes 5 are connected, after the collecting plate 3 drives the inner tubes 5 to move, the fire-fighting medium can overflow to perform immersion fire-fighting.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery core structure, comprising a shell (1) and a winding core (2), wherein the winding core (2) is accommodated inside the shell (1); Features: It also includes a collecting plate (3), an elastic member (4), an inner tube (5) and an isolation membrane (6), wherein: The current collecting disk (3) is electrically connected to the winding core (2); The elastic member (4) is arranged between the collecting plate (3) and the inner wall of the housing (1); The inner tube (5) is filled with a fire-fighting medium, and both ends of the inner tube (5) are sealed by an isolation membrane (6), and the winding core (2) is wound on the inner tube (5); One end of the inner tube (5) is connected to the current collecting plate (3), and the other end is abutted against the inner wall of the shell (1).

2. The battery cell structure according to claim 1, characterized in that: The elastic member (4) is a fluid-permeable member; one end of the elastic member (4) is connected to the inner wall of the shell (1), and the other end is connected to the current collecting plate (3).

3. The battery cell structure according to claim 1, characterized in that: Two inner tubes (5) are arranged in the shell (1), and one end of each of the two inner tubes (5) is connected to each other, the end of one of the inner tubes (5) is connected to the collecting plate (3), and the end of the other inner tube (5) is connected to the inner wall of the shell (1).

4. The battery cell structure according to claim 1, characterized in that: Two of the current collecting plates (3) and two of the elastic members (4) are provided in the housing (1); Two inner tubes (5) are arranged in the shell (1), one end of each of the two inner tubes (5) is connected to each other, and the other ends of the two inner tubes (5) are installed and fixed via the collecting plate (3) and the elastic member (4).

5. The battery cell structure according to claim 3 or 4, characterized in that: The two isolation membranes (6) on the opposite ends of the two inner tubes (5) are connected by glue dispensing.

6. The battery cell structure according to claim 3 or 4, characterized in that: The two inner tubes (5) are of equal length.

7. The battery cell structure according to claim 4, characterized in that: The two inner tubes (5) are interconnected.

8. The battery cell structure according to any one of claims 1 to 4, characterized in that: The housing (1) comprises a cylinder (11) and an end cover (12), wherein: The winding core (2) and the inner tube (5) are arranged in the cylinder (11); The end cap (12) is provided at each end of the cylinder (11) to seal the cylinder (11); The elastic member (4) is arranged between the collecting plate (3) and the end cover (12).

9. The battery cell structure according to claim 8, characterized in that: It also comprises a hose (7), the end cover (12) is provided with a through hole (101), and one end of the inner tube (5) connected to the current collecting plate (3) is in communication with the hose (7); The other end of the hose (7) is connected to the end cover (12) and communicates with the through hole (101).

10. The battery cell structure according to claim 9, characterized in that: The isolation membrane (6) is arranged on the end cover (12) and is used to seal the through hole (101).

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