Battery shell assembly and battery

Abstract

The utility model discloses a battery shell assembly which comprises a shell, a battery cell side plate, a protective cover and an anti-explosion valve, and the shell is provided with an anti-explosion hole and an inner cavity for placing a battery cell pole group; the battery cell side plate is arranged in the inner cavity and is positioned on one side, provided with the anti-explosion hole, of the shell; the protective cover is arranged between the battery cell side plate and the shell and corresponds to the explosion-proof hole, the protective cover is connected with the inner wall of the shell, and the protective cover is provided with at least one first through hole; and the anti-explosion valve is connected in the anti-explosion hole. According to the utility model, the anti-explosion valve and the battery cell side plate are isolated by arranging the protective cover, so that the anti-explosion valve can be prevented from being scratched when the battery cell pole group and the shell are assembled, the anti-explosion valve can be prevented from being extruded by the movement of the battery cell side plate in the working process of the battery, and the battery cell pole group can be prevented from being rubbed and punctured by residual metal burrs generated by processing the anti-explosion hole; and the safety of the battery shell assembly is improved.

Description

Technical Field

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

[0002] As a common energy storage device, power batteries such as lithium-ion batteries are widely used in the energy supply systems of electric vehicles and other electrical equipment. As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] The existing lithium-ion battery structure includes a shell, an explosion-proof valve, a battery cell side plate, and a battery cell disposed in the shell. The explosion-proof valve can explode and release pressure when the pressure is too high due to thermal runaway inside the battery. The battery cell side plate is disposed between the battery cell and the shell, and is provided with an air passage connected to the explosion-proof valve to protect the battery cell. However, during the assembly of the battery cell into the shell and the use of the battery, the vibration of the battery cell and the battery cell side plate often squeezes and scrapes the explosion-proof valve, posing a safety hazard. In addition, the metal burrs that may exist in the explosion-proof holes formed by machining and stamping of the shell will also rub against the battery cell, causing risks such as puncture. Utility Model Content

[0004] According to one object of the utility model, a battery housing assembly is provided, which can isolate the explosion-proof valve from the battery cell side plate to avoid mutual squeezing and scraping between the battery cell side plate and the explosion-proof valve.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A battery shell assembly comprises an outer shell, a battery cell side plate, a protective cover and an explosion-proof valve, wherein the outer shell is provided with an explosion-proof hole and an inner cavity for placing a battery cell pole group; the battery cell side plate is arranged in the inner cavity and is located on a side of the outer shell where the explosion-proof hole is arranged; the protective cover is arranged between the battery cell side plate and the outer shell and is arranged corresponding to the explosion-proof hole, the protective cover is connected to the inner wall of the outer shell, and the protective cover is provided with at least one first through hole; the explosion-proof valve is connected in the explosion-proof hole.

[0007] Preferably, the battery cell side plate and the side wall plate of the shell on which the explosion-proof hole (11) is arranged are spaced apart in a first direction, and a height L of the protective cover in the first direction is smaller than a distance H between the battery cell side plate and the shell.

[0008] Preferably, a cross-sectional area of ​​the protective cover perpendicular to the first direction is S, and a cross-sectional area of ​​the explosion-proof hole perpendicular to the first direction is F, wherein S / F≥1.1.

[0009] Preferably, the protective cover comprises a connecting portion and a protective plate, the connecting portion is arranged at the edge of the protective plate and connected to the outer shell, and the protective plate is used to isolate the explosion-proof valve from the battery cell side plate.

[0010] Preferably, the protective plate protrudes in a direction away from the explosion-proof hole, and the connecting portion and the protective plate form a buffer cavity.

[0011] Preferably, the battery cell side plate is provided with a plurality of second through holes, and at least some of the second through holes are arranged corresponding to the explosion-proof holes.

[0012] Preferably, the battery cell side plate comprises a protrusion, the protrusion is arranged on a side of the battery cell side plate close to the explosion-proof hole, and the top of the protrusion abuts against the inner wall of the shell.

[0013] Preferably, a plurality of the protrusions are provided, and the plurality of the protrusions are arranged at intervals along the length direction of the battery cell side plate.

[0014] Preferably, the protrusion is a trapezoidal table structure.

[0015] According to another object of the utility model, a battery is provided, comprising a battery cell pole group and a battery housing assembly as described in any one of the above items, wherein the battery cell pole group is arranged in the inner cavity of the battery housing assembly and is located on a side of the battery cell side plate away from the explosion-proof hole.

[0016] Beneficial effects of the utility model:

[0017] The battery shell assembly provided by the utility model includes an outer shell, a battery cell side plate, a protective cover and an explosion-proof valve, wherein the outer shell is provided with an explosion-proof hole, the battery cell side plate is provided in the shell and is located on a side provided with the explosion-proof hole, the protective cover is provided corresponding to the explosion-proof hole and is connected to the inner wall of the outer shell, and the explosion-proof valve is provided in the explosion-proof hole. The utility model can avoid the explosion-proof valve being scratched when the battery cell pole group is assembled with the shell and the explosion-proof valve being squeezed by the battery cell side plate during battery operation by providing a protective cover to isolate the explosion-proof valve from the battery cell side plate, and can prevent the metal burrs remaining in the processing of the explosion-proof hole from rubbing and piercing the battery cell pole group, thereby improving the safety of the battery shell assembly.

[0018] The battery provided by the utility model comprises the above-mentioned battery housing assembly and battery core electrode group, and has higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded diagram of the battery provided by the utility model;

[0020] Figure 2 It is a partial cross-sectional view of the battery housing assembly provided by the utility model;

[0021] Figure 3 It is a schematic diagram of a protective cover of a battery housing assembly provided by the utility model;

[0022] Figure 4 It is a partial schematic diagram of a cell side plate of a battery housing assembly provided by the utility model.

[0023] In the figure:

[0024] 1. Shell; 11. Explosion-proof hole;

[0025] 2. battery cell side plate; 21. second through hole; 22. protrusion;

[0026] 3. Protective cover; 31. First through hole; 32. Connecting part; 33. Protective plate;

[0027] 4. Explosion-proof valve; 5. Battery cell group. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 3As shown, the utility model provides a battery shell assembly, which can be used in a battery to achieve the installation of a battery cell pole group 5. Specifically, the battery shell assembly includes a shell 1, a battery cell side plate 2, a protective cover 3 and an explosion-proof valve 4. The shell 1 is provided with an explosion-proof hole 11 and an inner cavity for placing the battery cell pole group 5. In some embodiments, the shell 1 is a square shell, and one side of the shell 1 forms a side opening for the battery cell pole group 5 to enter and exit. The battery cell side plate 2 is arranged in the inner cavity and is located on the side of the shell 1 where the explosion-proof hole 11 is provided to protect the battery cell pole group 5. The protective cover 3 is arranged between the battery cell side plate 2 and the shell 1 and is arranged corresponding to the explosion-proof hole 11. In some embodiments, the protective cover 3 is a metal part, and in some other embodiments, the protective cover 3 can also be a plastic part. The protective cover 3 is connected to the inner wall of the shell 1. The protective cover 3 can be welded to the inner wall of the shell 1, or it can be connected to the inner wall of the shell 1 by bonding. At least one first through hole 31 is provided on the protective cover 3, and the first through hole 31 serves as an exhaust passage between the explosion-proof valve 4 and the battery cell pole group 5, so as to ensure that the airflow can flow into the explosion-proof hole 11 through the first through hole 31 when the battery cell pole group 5 is thermally expanded. The explosion-proof valve 4 is connected in the explosion-proof hole 11.

[0032] The battery shell assembly provided by the utility model includes a shell 1, a battery cell side plate 2, a protective cover 3 and an explosion-proof valve 4, wherein the shell 1 is provided with an explosion-proof hole 11, the battery cell side plate 2 is provided in the shell 1 and on one side close to the explosion-proof hole 11, the protective cover 3 is provided corresponding to the explosion-proof hole 11 and connected to the inner wall of the shell 1, and the explosion-proof valve 4 is connected in the explosion-proof hole 11. The utility model isolates the explosion-proof valve 4 and the battery cell side plate 2 by providing the protective cover 3, thereby preventing the battery cell pole group 5 from being scratched on the explosion-proof valve 4 when being assembled with the shell 1 and the explosion-proof valve 4 from being squeezed by the battery cell side plate 2 during battery operation, and preventing the metal burrs remaining in the processing of the explosion-proof hole 11 from rubbing and piercing the battery cell pole group 5, thereby improving the safety of the battery shell assembly.

[0033] In some embodiments, at least two explosion-proof holes 11 are provided, and at least two explosion-proof holes 11 are spaced apart and arranged on the same side of the housing 1. In a specific embodiment, Figure 1 As shown, two explosion-proof holes 11 are arranged on the top plate of the housing 1, and an explosion-proof valve 4 is arranged in each explosion-proof hole 11. A mounting groove is arranged on the outside of the explosion-proof hole 11, and the explosion-proof valve 4 is installed in the mounting groove to prevent the outer end surface of the explosion-proof valve 4 from protruding from the outer wall surface of the housing 1, facilitate the positioning of the explosion-proof valve 4, and make the housing 1 compact.

[0034] In a specific embodiment, the battery cell side plate 2 is disposed in the inner cavity of the housing 1 and is located at the top of the inner cavity, that is, the battery cell side plate 2 and the top plate of the housing 1 are spaced apart in a first direction, and the first direction is the height direction of the housing 1. Of course, in other embodiments, when the setting position of the explosion-proof hole 11 in the housing 1 is changed, the battery cell side plate 2 can also be set at other positions in the inner cavity to achieve a relative setting with the explosion-proof hole 11. At this time, the first direction is other directions of the housing 1, such as the front-to-back direction or the left-to-right direction.

[0035] Further, refer to Figure 2 As shown, the height L of the protective cover 3 in the first direction is less than the distance H between the battery cell side plate 2 and the outer shell 1. Such a setting can avoid the friction between the battery cell pole group 5 and the battery cell side plate 2 and the protective cover 3 when they are installed in the outer shell 1, reduce the difficulty of assembling the battery, and eliminate the loss of the battery during assembly. Of course, the smaller the gap between L and H, the more compact the structure between the outer shell 1 and the battery cell side plate 2 and the battery cell pole group 5, and the smaller the shaking degree of the battery cell pole group 5 when it oscillates in the outer shell 1; the larger the gap between L and H, the faster the gas flow rate of the battery cell pole group 5 when it expands thermally, and the higher the safety of the battery.

[0036] In some embodiments, the ratio of L / H satisfies: 0.5≤L / H≤0.8, so as to take into account both the compactness and safety of the battery housing assembly. In a specific embodiment, L / H is 0.5; in a specific embodiment, L / H is 0.6; in a specific embodiment, L / H is 0.7; in a specific embodiment, L / H is 0.8.

[0037] Furthermore, the cross-sectional area of ​​the protective cover 3 in a direction perpendicular to the first direction is S, the cross-sectional area of ​​the explosion-proof hole 11 in a direction perpendicular to the first direction is F, and the ratio of S / F satisfies: S / F≥1.1. Since the protective cover 3 needs to cover the explosion-proof hole 11, the cross-sectional area S of the protective cover 3 needs to be greater than or equal to the cross-sectional area F of the explosion-proof hole 11, and part of the protective cover 3 is used to connect with the inner wall of the shell 1, and the cross-sectional area S of the protective cover 3 needs to be greater than the cross-sectional area F of the explosion-proof hole 11. In order to ensure the connection strength and the structural strength of the protective cover 3, the ratio of S / F needs to satisfy S / F≥1.1, and the larger the ratio of S / F, the more firmly the connection between the protective cover 3 and the shell 1 is.

[0038] In a specific embodiment, the S / F ratio is 1.2; in a specific embodiment, the S / F ratio is 1.3; in a specific embodiment, the S / F ratio is 1.4; in a specific embodiment, the S / F ratio is 1.5; in a specific embodiment, the S / F ratio is 1.6.

[0039] In some embodiments, the cross section of the protective cover 3 is square, the cross section of the explosion-proof hole 11 is a waist-shaped hole, and the explosion-proof valve 4 is a waist-shaped explosion-proof disk. In some other embodiments, the cross section of the protective cover 3 can be circular, elliptical, etc., the cross section of the explosion-proof hole 11 can also be circular, square, etc., and the explosion-proof valve 4 can also be a circular or square explosion-proof disk.

[0040] As a preference, Figure 3 As shown, the protective cover 3 includes a connecting portion 32 and a protective plate 33. The connecting portion 32 is arranged at the edge of the protective plate 33 for connecting with the outer shell 1, and the connecting portion 32 can be bonded to the inner wall of the outer shell 1, and can also be welded to the inner wall of the outer shell 1. The protective plate 33 is used to isolate the explosion-proof valve 4 and the battery cell side plate 2, and plays a role in protecting the explosion-proof valve 4 and the battery cell side plate 2. A first through hole 31 can be set on the protective plate 33 to ensure gas circulation between the inner cavity of the outer shell 1 and the explosion-proof hole 11.

[0041] As a specific implementation, the protective plate 33 is raised in a direction away from the explosion-proof hole 11, the raised portion is the protective plate 33, the edge portion that is not raised is the connecting portion 32, and the connecting portion 32 and the protective plate 33 form a buffer cavity. In this embodiment, the protective plate 33 is a flat plate structure, and in some other embodiments, the protective plate 33 may also be an arc-shaped structure.

[0042] Continue to refer to Figure 3 In this embodiment, the cross-sectional shape of the first through hole 31 is an ellipse, and multiple rows of first through holes 31 are evenly arranged on the protective cover 3. In some other embodiments, the first through holes 31 may also be circular holes, square holes, or long holes of other shapes. The arrangement of the first through holes 31 may also be different, such as being distributed in a circular ring shape, multiple rows of first through holes 31 being staggered, etc.

[0043] Furthermore, if Figure 4 As shown, the battery cell side plate 2 is provided with a plurality of second through holes 21, and the second through holes 21 are used for the gas inside the battery cell pole group 5 to flow out to the explosion-proof valve 4. At least part of the second through holes 21 are arranged corresponding to the explosion-proof hole 11, which can further reduce the flow distance of the gas to the explosion-proof valve 4, making the gas flow more unobstructed, and can effectively ensure that the explosion-proof valve 4 can be normally exploded. As a preferred embodiment, the plurality of second through holes 21 are evenly distributed on the entire battery cell side plate 2, increasing the gas flow channel and expanding the gas flow speed. In this embodiment, the second through hole 21 is a long strip hole. In some other embodiments, the second through hole 21 can also be set as a circular hole, an elliptical hole, etc.

[0044] Continue to refer to Figure 4, the cell side plate 2 is provided with a protrusion 22, which is provided on the side of the cell side plate 2 close to the explosion-proof hole 11 and on the edge of the cell side plate 2, and the top of the protrusion 22 abuts against the inner wall of the shell 1. In some embodiments, a plurality of protrusions 22 are arranged in two rows in the width direction of the cell side plate 2, and the two rows of protrusions 22 are located at the edge of the cell side plate 2. Through the provision of the protrusion 22, after the battery is assembled, it can abut against the inner wall of the shell 1 to play a supporting role, prevent the cell side plate 2 from being tightly attached to the protective cover 3, and the space formed between the protective cover 3 and the cell pole group 5 is more conducive to the rapid discharge of gas inside the battery, avoiding the problem of poor airflow.

[0045] Furthermore, the cell side plate 2 is provided with a plurality of protrusions 22, which are arranged at intervals along the length direction of the cell side plate 2, and the plurality of protrusions 22 are all in contact with the inner wall of the shell 1 to ensure the stability of the cell side plate 2 and the shell 1 and prevent the cell side plate 2 from tilting.

[0046] In one embodiment, the protrusion 22 is a trapezoidal structure. In some parallel embodiments, the protrusion 22 is a rectangular structure or a cylindrical structure.

[0047] Continue to refer to Figure 1 As shown, the utility model also provides a battery, the battery includes a battery cell pole group 5 and the above-mentioned battery shell assembly, the battery cell pole group 5 is arranged in the inner cavity of the battery shell assembly, and is located on the side of the battery cell side plate 2 away from the explosion-proof hole 11. The battery can avoid the battery cell pole group 5 from scratching the explosion-proof valve 4 when assembling the battery cell pole group 5 and the battery shell assembly, and can prevent the metal burrs remaining in the processing of the explosion-proof hole 11 from rubbing and piercing the battery cell pole group 5, thereby improving the safety of the battery shell assembly and ensuring the service life of the battery.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing assembly, characterized in that: include A shell, wherein the shell is provided with an explosion-proof hole and an inner cavity for placing a battery cell electrode group; A battery cell side plate, the battery cell side plate is arranged in the inner cavity and located on a side of the shell where the explosion-proof hole is provided; A protective cover, the protective cover is arranged between the battery core side plate and the shell and is arranged corresponding to the explosion-proof hole, the protective cover is connected to the inner wall of the shell, and at least one first through hole is arranged on the protective cover; An explosion-proof valve is connected in the explosion-proof hole.

2. The battery housing assembly according to claim 1, characterized in that: The battery cell side plate and the side wall plate of the shell where the explosion-proof hole is arranged are spaced apart in the first direction, and a height L of the protective cover in the first direction is smaller than a distance H between the battery cell side plate and the shell.

3. The battery housing assembly according to claim 1, characterized in that: The cross-sectional area of ​​the protective cover perpendicular to the first direction is S, and the cross-sectional area of ​​the explosion-proof hole perpendicular to the first direction is F, wherein S / F≥1.

1.

4. The battery housing assembly according to claim 1, characterized in that: The protective cover comprises a connecting portion and a protective plate, wherein the connecting portion is arranged at the edge of the protective plate and connected to the outer shell, and the protective plate is used to isolate the explosion-proof valve from the battery cell side plate.

5. The battery housing assembly according to claim 4, characterized in that: The protective plate protrudes in a direction away from the explosion-proof hole, and the connecting portion and the protective plate form a buffer cavity.

6. The battery housing assembly according to claim 1, characterized in that: The battery cell side plate is provided with a plurality of second through holes, and at least some of the second through holes are arranged corresponding to the explosion-proof holes.

7. The battery housing assembly according to claim 1, characterized in that: The battery cell side plate comprises a protruding portion, the protruding portion is arranged on a side of the battery cell side plate close to the explosion-proof hole, and the top of the protruding portion abuts against the inner wall of the shell.

8. The battery housing assembly according to claim 7, characterized in that: A plurality of the protrusions are provided, and the plurality of the protrusions are arranged at intervals along the length direction of the battery cell side plate.

9. The battery housing assembly according to claim 7, characterized in that: The protrusion is a trapezoidal table structure.

10. A battery, characterized in that: It comprises a battery cell pole group and a battery casing assembly according to any one of claims 1 to 9, wherein the battery cell pole group is arranged in the inner cavity of the battery casing assembly and is located on a side of the battery cell side plate away from the explosion-proof hole.

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