Battery

Abstract

The utility model provides a battery which comprises a box body and a battery cell arranged in the box body, a bottom plate of the box body is provided with an exhaust channel, a confluence flow channel and a battery cell shell, the shell is provided with a liquid cooling flow channel for a liquid cooling medium to flow, and at least two liquid cooling holes are formed in one side, facing the bottom plate, of the shell. The liquid cooling flow channel is communicated with the confluence flow channel through the liquid cooling holes, and the at least two liquid cooling holes comprise at least one liquid inlet hole and at least one liquid outlet hole; the battery cell body is arranged in the shell; the anti-explosion valve is arranged on the side, facing the bottom plate, of the shell, and the anti-explosion valve communicates with the exhaust channel. The battery provided by the utility model solves the problem that thermal runaway is easy to occur in the battery in the prior art.

Description

Technical Field

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

[0002] With the continuous expansion of the new energy vehicle market, batteries, as the core energy storage and supply devices of new energy vehicles, are attracting increasing attention in society for their safety. Currently, batteries on the market usually have multiple cells inside, and a liquid cooling plate is installed at the bottom of the cell to cool the cell. At the same time, an explosion-proof valve is installed on the cell so that the cell can be discharged through the explosion-proof valve when thermal runaway occurs.

[0003] However, the liquid cooling plate in the battery is arranged on the outside of the battery cell shell, which has a certain heat conduction path. At present, the charging speed is getting faster and faster, and the fast charging of the battery cells will generate a lot of heat. The current liquid cooling system may not be able to take away the heat in time, so it cannot meet the current requirements for faster and faster charging speeds. The battery cells are prone to thermal runaway, leading to safety problems. In addition, the explosion-proof valves of the current battery cells are mostly set on the top cover of the battery cells. In this way, when the temperature and pressure inside the battery cell exceed the preset safety value, the high-temperature and high-pressure substances discharged by the explosion-proof valve are likely to affect other battery cells, causing thermal runaway of other battery cells and leading to safety problems.

[0004] As can be seen from the above, the battery in the prior art has the technical problem of being prone to thermal runaway. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery to solve the problem that the battery in the prior art is prone to thermal runaway.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery is provided, the battery includes a box body and a battery cell arranged inside the box body, the bottom plate of the box body has an exhaust channel and a confluence channel, the battery cell includes a shell, the shell has a liquid cooling channel for the flow of liquid cooling medium, and at least two liquid cooling holes are opened on the side of the shell facing the bottom plate, the liquid cooling channel is connected with the confluence channel through the liquid cooling holes, and the at least two liquid cooling holes include at least one liquid inlet hole and at least one liquid outlet hole; the battery cell body, the battery cell body is arranged inside the shell; the explosion-proof valve, the explosion-proof valve is arranged on the side of the shell facing the bottom plate, and the explosion-proof valve is connected with the exhaust channel.

[0007] Furthermore, the converging flow channel includes an inlet flow channel and an outlet flow channel arranged at intervals, the inlet hole is connected to the inlet flow channel, the outlet hole is connected to the outlet flow channel, and the exhaust channel is arranged between the inlet flow channel and the outlet flow channel.

[0008] Furthermore, the shell includes a bottom cold plate and multiple side cold plates, the multiple side cold plates and the bottom cold plate cooperate to form an installation cavity for accommodating the battery cell body, and each side cold plate and the bottom cold plate are provided with liquid cooling channels interconnected.

[0009] Furthermore, the shell also includes an intermediate cold plate, which is upright inside the installation cavity, dividing the installation cavity into a plurality of sub-cavities for accommodating the battery cell body. The intermediate cold plate has a liquid cooling channel, and the liquid cooling channel of the intermediate cold plate is connected to the liquid cooling channel in the bottom cold plate and / or the side cold plate.

[0010] Furthermore, an intermediate cold plate is provided between every two adjacent battery cell bodies.

[0011] Furthermore, the shell includes a bottom cold plate and an annular baffle, the baffle is arranged on the bottom cold plate for blocking the liquid cooling channel, the baffle is arranged to form an explosion-proof channel extending along the height direction of the shell, the explosion-proof channel is connected to the exhaust channel, and at least a portion of the explosion-proof valve is arranged inside the explosion-proof channel and connected to the explosion-proof channel.

[0012] Furthermore, the liquid cooling hole includes a liquid inlet hole and a liquid outlet hole, the liquid inlet hole is connected to the liquid inlet channel, and the liquid outlet hole is connected to the liquid outlet channel.

[0013] Further, the battery cell body is provided with one or more explosion-proof valves at the bottom of each battery cell body; and / or, the battery cell body is provided with one or more explosion-proof valves at the bottom of each battery cell body; and / or, the battery cell body is provided with one or more explosion-proof valves at the bottom of each battery cell body.

[0014] Furthermore, the battery cell further includes a top cover and a pole arranged on the top cover, and the top cover is arranged at the top opening of the shell; or the pole is arranged on at least one side surface of the shell.

[0015] Furthermore, the battery also includes a seal, a first through hole connected to the exhaust channel is provided on the bottom plate, at least a portion of the explosion-proof valve extends into the interior of the first through hole, and the seal is arranged between the explosion-proof valve and the inner wall surface of the first through hole; and\or a second through hole connected to the converging flow channel is provided on the bottom plate, the shell has a protruding structure extending toward the bottom plate, the protruding structure has a liquid cooling hole extending along the height direction of the shell, at least a portion of the protruding structure extends into the interior of the second through hole, and the seal is arranged between the protruding structure and the inner wall surface of the second through hole.

[0016] By applying the technical solution of the utility model, the following technical effects are achieved:

[0017] 1. By arranging the explosion-proof valve on the side of the battery body close to the bottom of the box, the explosion-proof valve is connected to the exhaust channel on the bottom plate of the box, so as to facilitate the discharge of high-temperature and high-pressure gas discharged from the explosion-proof valve through the exhaust channel of the box when the internal pressure of the battery exceeds the preset safety value, thereby avoiding the safety problem caused by the high-temperature and high-pressure substances discharged from the explosion-proof valve in the prior art that easily affect other battery cells and cause thermal runaway of other battery cells.

[0018] 2. Since the liquid cooling channel of the shell is directly connected to the converging channel in the box through the liquid cooling hole, the liquid cooling medium in the liquid cooling channel can directly contact the shell of the battery cell for heat exchange. The heat conduction distance is short and the cooling efficiency is higher. The heat can be taken away in time to reduce thermal runaway of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the box and battery of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the battery cell of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the housing of the present application;

[0023] Figure 4 A cross-sectional view of the housing of the present application;

[0024] Figure 5 for Figure 4 A magnified view of point A;

[0025] Figure 6 Another angle sectional view of the housing of the present application;

[0026] Figure 7 for Figure 6 The enlarged view of point B;

[0027] Figure 8 This is a schematic diagram of the structure of the explosion-proof passage of this application.

[0028] The above drawings include the following reference numerals:

[0029] 1. Box body; 11. Exhaust channel; 12. Converging channel; 121. Liquid inlet channel; 122. Liquid outlet channel; 2. Battery cell; 3. Shell; 31. Liquid cooling hole; 311. Liquid inlet hole; 312. Liquid outlet hole; 32. Bottom cold plate; 33. Side cold plate; 34. Middle cold plate; 35. Baffle; 36. Explosion-proof channel; 4. Battery cell body; 5. Explosion-proof valve; 6. Pole; 7. Seal. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0033] In order to solve the technical problem that batteries in the prior art are prone to thermal runaway, the present application provides a battery that overcomes the above problem by setting an explosion-proof valve at the bottom end of the battery cell and separating it from the pole.

[0034] A battery, see Figures 1 to 8 , including a box body 1 and a battery cell 2 arranged inside the box body 1, the bottom plate of the box body 1 has an exhaust channel 11 and a converging channel 12, the battery cell 2 includes a shell 3, a battery cell body 4 and an explosion-proof valve 5, the shell 3 has a liquid cooling channel for the flow of liquid cooling medium, and the shell 3 is provided with at least two liquid cooling holes 31 on the side facing the bottom plate, the liquid cooling channel is connected with the converging channel 12 through the liquid cooling holes 31, and at least two liquid cooling holes 31 include at least one liquid inlet hole and at least one liquid outlet hole, so as to realize the inflow and outflow of liquid cooling medium in the liquid flow channel; the battery cell body 4 is arranged inside the shell 3, and the explosion-proof valve 5 is arranged on the side of the shell 3 facing the bottom plate, and the explosion-proof valve 5 is connected with the exhaust channel 11.

[0035] During the installation of the battery cell 2 into the box body 1, the explosion-proof valve 5 is connected to the exhaust channel 11, and the liquid cooling hole 31 is connected to the converging flow channel 12, so as to realize the exhaust and liquid cooling cycle of the battery cell 2. By setting the explosion-proof valve 5 on the side of the battery cell 2 close to the bottom surface of the box body 1, it is convenient to realize that when the internal pressure of the battery exceeds the preset safety value, the high-temperature and high-pressure gas discharged by the explosion-proof valve 5 is discharged from the exhaust channel 11, avoiding the problem of high-temperature and high-pressure substances discharged by the explosion-proof valve causing thermal runaway of other battery cells in the prior art; at the same time, since the liquid cooling flow channel of the shell is directly connected to the converging flow channel in the box body through the liquid cooling hole, the liquid cooling medium in the liquid cooling flow channel can directly contact the shell of the battery cell for heat exchange, and its heat conduction distance is short, the cooling efficiency is higher, and the heat can be taken away in time to reduce the thermal runaway of the battery cell. It should be noted that the liquid cooling medium in the present application does not necessarily have only a cooling effect, but can also be heated to heat the battery cell by heating it.

[0036] In this embodiment, the opening shapes of the exhaust channel 11 and the converging flow channel 12 may be rectangular, circular or any polygonal.

[0037] Furthermore, the converging channel 12 includes an inlet channel 121 and an outlet channel 122 arranged at intervals, the inlet hole 311 is connected to the inlet channel 121, the outlet hole 312 is connected to the outlet channel 122, and the exhaust channel 11 is arranged between the inlet channel 121 and the outlet channel 122.

[0038] Liquid cooling requires the liquid cooling medium to circulate in the housing 3 to take away the heat of the battery body 4, so the confluence channel 12 needs to be divided into a liquid inlet channel 121 and a liquid outlet channel 122. Since the gas discharged from the explosion-proof valve 5 is high-temperature gas, the exhaust channel 11 is arranged between the liquid inlet channel 121 and the liquid outlet channel 122. By circulating the liquid cooling medium in the liquid inlet channel 121 and the liquid outlet channel 122, the exhaust channel 11 can be cooled to avoid the direct discharge of high-temperature gas and cause safety accidents.

[0039] In this embodiment, the shell 3 includes a bottom cold plate 32 and multiple side cold plates 33. The multiple side cold plates 33 and the bottom cold plate 32 cooperate to form an installation cavity for accommodating the battery cell body 4. Each side cold plate 33 and the bottom cold plate 32 are provided with liquid cooling channels that are interconnected.

[0040] Among them, multiple side cold plates 33 and the bottom cold plate 32 of the shell 3 are all provided with liquid cooling channels, which can increase the contact area between the battery cell body 4 and the cold plate with the liquid cooling channel, so that the part of the battery cell body 4 in contact with the shell 3 can be cooled by liquid cooling, thereby improving the heat dissipation effect of the battery cell body 4.

[0041] Furthermore, the housing 3 further includes an intermediate cold plate 34, which is vertically arranged inside the mounting cavity, dividing the mounting cavity into a plurality of sub-cavities for accommodating the battery cell body 4. The intermediate cold plate 34 has a liquid cooling channel, and the liquid cooling channel of the intermediate cold plate 34 can be connected to the liquid cooling channel in the bottom cold plate 32, or the liquid cooling channel of the intermediate cold plate 34 can be connected to the liquid cooling channel in the side cold plate 33. Of course, the liquid cooling channel of the intermediate cold plate 34 can also be connected to the liquid cooling channel in the bottom cold plate 32 and the liquid cooling channel in the side cold plate 33 at the same time. In this embodiment, each sub-cavity can accommodate one battery cell body 4, or multiple battery cell bodies 4.

[0042] It is understandable that when there are multiple battery cell bodies 4, in order to improve the heat dissipation efficiency of the multiple battery cell bodies 4, an intermediate cold plate 34 is added to the shell 3. After the battery cell bodies 4 are installed, the intermediate cold plate 34 is located between two adjacent battery cell bodies 4, and the heat is dissipated on the side of the two adjacent battery cell bodies 4 that are close to each other, thereby improving the heat dissipation effect of the battery cell bodies 4. In order to further ensure the heat dissipation effect, the intermediate cold plate 34 is provided with a liquid cooling channel and is connected to the liquid cooling channel in the shell 3 to realize a liquid cooling cycle.

[0043] Furthermore, an intermediate cold plate 34 is provided between every two adjacent battery cell bodies 4 ; that is, each sub-cavity accommodates only one battery cell body 4 , so that each battery cell body 4 can be in full contact with the cold plate, achieving a better heat dissipation effect.

[0044] In this embodiment, the shell 3 also includes an annular baffle 35, which is arranged on the bottom cold plate 32 for blocking the liquid cooling channel. The baffle 35 is arranged to form an explosion-proof channel 36 extending along the height direction of the shell 3. The explosion-proof channel 36 is connected to the installation cavity and the exhaust channel 11. At least a portion of the explosion-proof valve 5 is arranged inside the explosion-proof channel 36 and is connected to the explosion-proof channel 36.

[0045] The baffle 35 serves as a partition to divide the liquid cooling channel and the explosion-proof valve 5 , and is simultaneously arranged in an annular direction to form an explosion-proof passage 36 , and the explosion-proof passage 36 is provided for the setting of the explosion-proof valve 5 .

[0046] In this embodiment, one or more battery cell bodies 4 are provided, and an explosion-proof valve 5 is provided at the bottom of each battery cell body 4 .

[0047] The battery cell body 4 may use one explosion-proof valve 5 alone, or multiple battery cell bodies 4 may share one explosion-proof valve 5 ; preferably, when each battery cell body 4 uses one explosion-proof valve 5 alone, a better explosion-proof effect can be achieved.

[0048] In this embodiment, one or more battery cell bodies 4 are provided, and at least one liquid inlet hole 311 and at least one liquid outlet hole 312 are provided at the bottom of each battery cell body 4 .

[0049] At least one liquid inlet hole 311 and at least one liquid outlet hole 312 are disposed under each battery cell body 4 , so that each battery cell body 4 can be cooled relatively evenly, thereby achieving a better cooling effect.

[0050] In this embodiment, the battery cell 2 further includes a top cover and a pole 6 disposed on the top cover, and the top cover is disposed at the opening of the housing 3 .

[0051] The pole 6 is not limited to being arranged on the cover plate, but may also be arranged on at least one side of the housing 3. Preferably, the pole is arranged on a side of the housing 3 different from the side where the explosion-proof valve is located.

[0052] The pole 6 serves to connect with the other components. By arranging the pole 6 at the top of the shell 3 and the explosion-proof valve 5 at the bottom of the shell 3, the pole 6 is separated from the explosion-proof valve 5. When a safety accident occurs to the explosion-proof valve 5, the connection of the pole 6 is not affected, which may lead to a more severe thermal accident.

[0053] In this embodiment, the battery also includes a seal 7, a first through hole connected to the exhaust channel 11 is provided on the bottom plate, at least a portion of the explosion-proof valve 5 extends into the interior of the first through hole, and the seal 7 is arranged between the explosion-proof valve 5 and the inner wall surface of the first through hole; a second through hole connected to the confluence flow channel 12 is provided on the bottom plate, the shell 3 has a protruding structure extending toward the bottom plate, and the protruding structure has a liquid cooling hole 31 extending along the height direction of the shell 3, at least a portion of the protruding structure extends into the interior of the second through hole, and the seal 7 is arranged between the protruding structure and the inner wall surface of the second through hole.

[0054] By arranging the seal 7 between the explosion-proof valve 5 and the bottom plate and between the liquid cooling hole 31 and the bottom plate, the sealing of the connection between the battery cell 2 and the box body 1 can be increased, and the leakage of the coolant or the gas discharged from the explosion-proof valve 5 can be reduced.

[0055] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0056] 1. By arranging the explosion-proof valve 5 on the side of the battery cell 2 close to the bottom surface of the box body 1, it is convenient to discharge the high-temperature and high-pressure gas discharged from the explosion-proof valve 5 through the exhaust passage 11 when the internal pressure of the battery exceeds the preset safety value, thereby avoiding the safety problem caused by the high-temperature and high-pressure substances discharged from the explosion-proof valve 5 in the prior art that easily affect other battery cells 2 and cause thermal runaway of other battery cells 2.

[0057] 2. Since the liquid cooling channel of the shell 3 is directly connected to the converging channel 12 in the box body 1 through the liquid cooling hole 31, the liquid cooling medium in the liquid cooling channel can directly contact the shell 3 of the battery cell 2 for heat exchange. The heat conduction distance is short and the cooling efficiency is higher. The heat can be taken away in time to reduce the thermal runaway of the battery cell.

[0058] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery, characterized in that: The battery comprises a box (1) and a battery cell (2) arranged inside the box (1), the bottom plate of the box (1) having an exhaust channel (11) and a converging channel (12), and the battery cell (2) comprises: A shell (3), the shell (3) having a liquid cooling channel for liquid cooling medium to flow, the shell (3) having at least two liquid cooling holes (31) on a side facing the bottom plate, the liquid cooling channel being connected to the converging channel (12) through the liquid cooling holes (31), and at least two of the liquid cooling holes (31) including at least one liquid inlet hole (311) and at least one liquid outlet hole (312); A battery cell body (4), wherein the battery cell body (4) is arranged inside the shell (3); An explosion-proof valve (5), the explosion-proof valve (5) being arranged on a side of the housing (3) facing the bottom plate, the explosion-proof valve (5) being in communication with the exhaust passage (11).

2. The battery according to claim 1, characterized in that The converging flow channel (12) comprises a liquid inlet flow channel (121) and a liquid outlet flow channel (122) arranged at intervals, the liquid inlet hole (311) is connected to the liquid inlet flow channel (121), the liquid outlet hole (312) is connected to the liquid outlet flow channel (122), and the exhaust channel (11) is arranged between the liquid inlet flow channel (121) and the liquid outlet flow channel (122).

3. The battery according to claim 1, characterized in that The shell (3) comprises a bottom cold plate (32) and a plurality of side cold plates (33); the plurality of side cold plates (33) and the bottom cold plate (32) cooperate to form a mounting cavity for accommodating the battery cell body (4); each of the side cold plates (33) and the bottom cold plate (32) is provided with the liquid cooling flow channels that are interconnected.

4. The battery according to claim 3, characterized in that The shell (3) further comprises an intermediate cold plate (34), wherein the intermediate cold plate (34) is vertically arranged inside the installation cavity, dividing the installation cavity into a plurality of sub-cavities for accommodating the battery cell body (4), and the intermediate cold plate (34) has the liquid cooling flow channel, and the liquid cooling flow channel of the intermediate cold plate (34) is connected with the liquid cooling flow channel in the bottom cold plate (32) and / or the side cold plate (33).

5. The battery according to claim 4, characterized in that An intermediate cold plate (34) is provided between each two adjacent battery core bodies (4).

6. The battery according to claim 1, characterized in that The shell (3) comprises a bottom cold plate (32) and an annular baffle (35), wherein the baffle (35) is arranged on the bottom cold plate (32) for blocking a liquid cooling channel, and the baffle (35) is arranged to form an explosion-proof channel (36) extending along the height direction of the shell (3), wherein the explosion-proof channel (36) is connected to the exhaust channel (11), and at least a portion of the explosion-proof valve (5) is arranged inside the explosion-proof channel (36) and is connected to the explosion-proof channel (36).

7. The battery according to claim 2, characterized in that The liquid cooling hole (31) comprises a liquid inlet hole (311) and a liquid outlet hole (312); the liquid inlet hole (311) is connected to the liquid inlet channel (121); and the liquid outlet hole (312) is connected to the liquid outlet channel (122).

8. The battery according to claim 1, characterized in that The battery cell body (4) is provided with one or more explosion-proof valves (5), and each battery cell body (4) is provided with one explosion-proof valve (5) at the bottom; and / or The battery cell body (4) is provided with one or more, and the bottom of each battery cell body (4) is provided with at least one liquid inlet hole (311) and at least one liquid outlet hole (312).

9. The battery according to any one of claims 1 to 8, characterized in that The battery cell (2) further comprises a top cover and a pole (6) arranged on the top cover, wherein the top cover is arranged at the opening of the shell (3); or The pole (6) is arranged on at least one side surface of the housing (3).

10. The battery according to any one of claims 1 to 8, characterized in that The battery further comprises a sealing member (7), The bottom plate has a first through hole connected to the exhaust channel (11), at least a portion of the explosion-proof valve (5) extends into the interior of the first through hole, and the sealing member (7) is arranged between the explosion-proof valve (5) and the inner wall surface of the first through hole; and\or The bottom plate has a second through hole connected to the converging channel (12), the shell (3) has a protruding structure extending toward the bottom plate, the protruding structure has the liquid cooling hole (31) extending along the height direction of the shell (3), at least a portion of the protruding structure extends into the interior of the second through hole, and the sealing member (7) is arranged between the protruding structure and the inner wall surface of the second through hole.

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