Battery cell structure and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cell structure and a battery, a frame is sleeved on the peripheral sides of two stage groups, and tabs of the two stage groups are welded and fixed; the frame and the stage group are wrapped in an insulating film, and the insulating film is provided with a kerf; the insulating film, the frame and the stage group are all inserted into the shell, a vent hole is formed in the side wall of the shell, an anti-explosion valve is arranged at the vent hole, the anti-explosion valve can selectively open or close the vent hole, and at least part of the anti-explosion valve is installed on the end face, facing the inner side of the shell, of the vent hole. The explosion-proof valve is at least partially mounted in the inner cavity of the shell, so that the volume of the explosion-proof valve on the outer side of the shell can be reduced, the damage of the explosion-proof valve caused by collision during transportation is avoided, and the mounting interference of the explosion-proof valve on the battery cell structure can be reduced. The insulating film is wrapped outside the stage group and the frame, and a buffer layer is formed between the frame and the shell, so that the frame is not in direct contact with the anti-explosion valve, and the anti-explosion valve is protected.

Description

Technical Field

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

[0002] Commonly, when the cells inside the battery are in an abnormal working state, they will generate a large amount of gas, causing the pressure inside the battery to rise, and there is a risk of explosion. Therefore, an explosion-proof valve is generally installed on the battery case. The explosion-proof valve is set to a normally closed state. When the pressure inside the battery is greater than the preset pressure threshold inside the explosion-proof valve, the explosion-proof valve opens, so that the gas inside the battery can be discharged through the explosion-proof valve to adjust the pressure inside the battery.

[0003] With the increasing improvement of the functions of new energy vehicles, the internal installation layout is becoming more and more compact, which results in that when the vehicle is running or during vehicle assembly, the explosion-proof valve installed on the outside of the case is easily collided with other structures and damaged.

[0004] Therefore, there is an urgent need for a cell structure and a battery to solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a cell structure and a battery, which can make the battery structure more compact and can protect the explosion-proof valve from damage during the assembly of the battery.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The cell structure includes:

[0008] A frame, the frame is sleeved on the periphery of two cell groups, and the tabs of the two cell groups are welded and fixed;

[0009] An insulating film, the frame and the cell groups are both wrapped in the insulating film, and the insulating film is provided with a slit;

[0010] A case, the insulating film, the frame and the cell groups are all inserted into the case, the side wall of the case is provided with a vent hole, an explosion-proof valve is arranged at the vent hole, the explosion-proof valve can selectively open or close the vent hole, and at least part of the explosion-proof valve is installed on the end face of the vent hole facing the inside of the case.

[0011] As a preferred technical solution of the above battery cell structure, the above housing includes a housing body, a positive end cap, and a negative end cap. The positive end cap and the negative end cap are installed at opposite ends of the housing body in a first direction. The side wall of the housing body in a second direction is provided with a first vent hole, and a first explosion-proof valve is installed in the first vent hole; the positive end cap and / or the negative end cap is provided with a second vent hole, and a second explosion-proof valve is installed at the second vent hole. The two above-mentioned cell groups are arranged in a mirror image along the first direction;

[0012] The first direction and the second direction are perpendicular to each other.

[0013] As a preferred technical solution of the above battery cell structure, the above frame includes two cross beams and two longitudinal beams. The two above-mentioned longitudinal beams are arranged in parallel in the first direction, and the two above-mentioned cross beams are arranged in parallel in the second direction. The cross beams and the longitudinal beams are connected end to end;

[0014] The longitudinal beam is provided with a first flow channel, and the fluid can flow along the first flow channel towards the first vent hole, and / or the cross beam is provided with a second flow channel, and the fluid can flow along the second flow channel towards the second vent hole.

[0015] As a preferred technical solution of the above battery cell structure, the edge of the longitudinal beam is serrated, and the groove formed by two adjacent serrations forms the first flow channel.

[0016] As a preferred technical solution of the above battery cell structure, the thickness of the longitudinal beam is 1 mm to 3 mm.

[0017] As a preferred technical solution of the above battery cell structure, it further includes a support plate and a protection plate. The support plate is located between the two above-mentioned cell groups and is fixed to the frame. The protection plate is movably connected to the support plate. One of the protection plate and the support plate is provided with a placement groove, and the tab of the cell group can be placed in the placement groove and clamped between the support plate and the protection plate.

[0018] As a preferred technical solution of the above battery cell structure, the support plate and the protection plate can be locked by a buckle.

[0019] As a preferred technical solution of the above battery cell structure, the support plate and the protection plate are hinged.

[0020] As a preferred technical solution of the above battery cell structure, the frame is provided with mounting holes, and convex platforms are arranged on both sides of the support plate, and the convex platforms are inserted into the mounting holes.

[0021] A battery is also provided, including the above battery cell structure.

[0022] Advantages of the present utility model:

[0023] The present utility model provides a battery cell structure and a battery. The battery cell structure includes a frame, an insulating film, and a housing. Among them, the frame is sleeved on the periphery of two electrode groups, and the electrode tabs of the two electrode groups are welded and fixed; the frame and the electrode groups are both wrapped in the insulating film, and the insulating film is provided with a slit; the insulating film, the frame, and the electrode groups are all inserted into the housing, and the side wall of the housing is provided with a ventilation hole, and an explosion-proof valve is arranged at the ventilation hole. The explosion-proof valve can selectively open or close the ventilation hole, and at least part of the explosion-proof valve is installed on the end face of the ventilation hole facing the inner side of the housing.

[0024] Specifically, the two electrode groups are electrically connected through the electrode tabs, and the electrode tabs are fixed by welding. In this way, the use of wire harnesses or other connectors can be reduced, costs can be saved, the installation process can be reduced, space can be saved, and the reliability of welding is relatively high; the frame is sleeved on the periphery of the two electrode groups. In this way, the relative positions of the two electrode groups are kept stable, and when the electrode groups are installed in the housing, the frame makes the force received by the two electrode groups uniform; the housing is provided with a ventilation hole, and the ventilation hole can communicate the interior of the housing with the outdoor environment. The explosion-proof valve is installed at the ventilation hole, and the explosion-proof valve can selectively open or close the ventilation hole according to the pressure change of the housing to adjust the pressure inside the housing. At least part of the explosion-proof valve is installed inside the inner cavity of the housing, so that the volume of the explosion-proof valve located outside the housing can be reduced, the damage of the explosion-proof valve caused by collision during transportation can be avoided, and the installation interference of the explosion-proof valve on the battery cell structure can be reduced. The insulating film is wrapped outside the electrode group and the frame, forming a buffer layer between the frame and the housing, so that the frame and the explosion-proof valve do not come into direct contact, protecting the explosion-proof valve. The insulating film is provided with a slit, so that the gas generated by the electrode group can be discharged outside the insulating film through the slit. When the pressure inside the housing is greater than the preset pressure threshold of the explosion-proof valve, the explosion-proof valve opens to discharge part of the gas from the housing to reduce the pressure inside the housing. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0026] Figure 1 It is an assembly schematic diagram of a frame, a support plate, and a protection plate provided by an embodiment of the present utility model;

[0027] Figure 2 It is a structural schematic diagram of a frame provided by an embodiment of the present utility model;

[0028] Figure 3It is a schematic diagram of the assembly of the frame and the stage group provided by the embodiment of the present utility model;

[0029] Figure 4 It is a schematic diagram of the structure of the shell body provided by the embodiment of the present utility model;

[0030] Figure 5 It is Figure 4 The cross-sectional view at A-A in

[0031] Figure 6 It is Figure 5 The partial enlarged view at B in

[0032] Figure 7 It is a schematic diagram of the structure of the negative end cover provided by the embodiment of the present utility model;

[0033] Figure 8 It is a schematic diagram of the open state of the support plate and the protection plate provided by the embodiment of the present utility model;

[0034] Figure 9 It is a schematic diagram of the closed state of the support plate and the protection plate provided by the embodiment of the present utility model.

[0035] In the figure:

[0036] X, the first direction; Y, the second direction; Z, the third direction;

[0037] 100, the frame; 110, the cross beam; 111, the second flow channel; 120, the longitudinal beam; 121, the first flow channel; 122, the mounting hole; 130, the support plate; 140, the protection plate;

[0038] 200, the stage group;

[0039] 300, the housing; 310, the shell body; 311, the first explosion-proof valve; 320, the positive end cover; 330, the negative end cover; 331, the second explosion-proof valve;

[0040] 400, the insulating film. Specific embodiments

[0041] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] As Figures 1 to 9 shown, the present utility model provides a battery cell structure, including a frame 100, an insulating film 400, and a housing 300. Among them, the frame 100 is sleeved on the peripheries of two electrode groups 200, and the tabs of the two electrode groups 200 are welded and fixed; the frame 100 and the electrode groups 200 are both wrapped in the insulating film 400, and the insulating film 400 is provided with a slit; the insulating film 400, the frame 100, and the electrode groups 200 are all inserted into the housing 300, the side wall of the housing 300 is provided with air vents, and an explosion-proof valve is arranged at the air vents. The explosion-proof valve can selectively open or close the air vents, and at least part of the explosion-proof valve is installed on the end face of the air vent facing the inner side of the housing 300.

[0046] Specifically, the two cell groups 200 are electrically connected through the connection of the tabs, and the tabs are fixed by welding. In this way, the use of wire harnesses or other connectors can be reduced, the cost can be saved, the installation process can be reduced, the space can be saved, and the reliability of welding is relatively high; the frame 100 is sleeved on the periphery of the two cell groups 200. In this way, the relative positions of the two cell groups 200 are kept stable, and when the cell groups 200 are installed in the housing 300, the frame 100 makes the forces on the two cell groups 200 uniform; the housing 300 is provided with air vents, and the air vents can communicate the interior of the housing 300 with the outdoor environment. The explosion-proof valve is installed in the air vents, and the explosion-proof valve can selectively open or close the air vents according to the pressure change of the housing 300 to adjust the pressure inside the housing 300. At least part of the explosion-proof valve is installed in the inner cavity of the housing 300, so that the volume of the explosion-proof valve located outside the housing 300 can be reduced, the damage of the explosion-proof valve caused by collision during transportation can be avoided, and the installation interference of the explosion-proof valve on the cell structure can be reduced.

[0047] Generally, the explosion-proof valve is first assembled with the housing 300, and then the frame 100 and the cell groups 200 are assembled with the housing 300. However, during the installation process, the frame 100 is likely to rub or collide with the part of the explosion-proof valve located inside the housing 300, resulting in damage to the explosion-proof valve; for this reason, in this embodiment, the insulating film 400 is wrapped outside the cell groups 200 and the frame 100 to form a buffer layer between the frame 100 and the housing 300, so that the frame 100 and the explosion-proof valve do not come into direct contact, protecting the explosion-proof valve. The insulating film 400 is provided with slits, so that the gas generated by the cell groups 200 can be discharged outside the insulating film 400 through the slits. When the pressure inside the housing 300 is greater than the preset pressure threshold of the explosion-proof valve, the explosion-proof valve opens to discharge part of the gas from the housing 300 to reduce the pressure inside the housing 300.

[0048] Specifically, the slits can be straight slits or cross-shaped slits.

[0049] Optionally, the housing 300 includes a housing body 310, a positive end cover 320 and a negative end cover 330. The positive end cover 320 and the negative end cover 330 are installed at opposite ends of the housing body 310 in the first direction X. The side wall of the housing body 310 in the second direction Y is provided with a first air vent, and a first explosion-proof valve 311 is installed in the first air vent; the positive end cover 320 and / or the negative end cover 330 are provided with second air vents, and second explosion-proof valves 331 are installed at the second air vents. The two cell groups 200 are arranged in a mirror image along the first direction X; the first direction X and the second direction Y are perpendicular.

[0050] Specifically, two stage groups 200 are arranged along the first direction X, and the electrodes of the stage group 200 are adjacent to each other for welding and fixing; by providing a first explosion-proof valve 311 and a second explosion-proof valve 331 in different areas of the housing 300, the travel of gas flow can be shortened, and the gas can be discharged out of the housing 300 from the first explosion-proof valve 311 or the second explosion-proof valve 331 nearby, improving the exhaust efficiency and the safety of the battery cell.

[0051] Preferably, the first air vent is provided at the midpoint position of the positive end cap 320 and the negative end cap 330 in the first direction X.

[0052] It should be noted that at least one first air vent and / or second air vent is provided, and the specific number of settings can be adjusted according to the actual size or usage scenario. The first explosion-proof valve 311 is provided in one-to-one correspondence with the first air vent, and the second explosion-proof valve 331 is provided in one-to-one correspondence with the second air vent.

[0053] Optionally, the frame 100 includes two cross beams 110 and two longitudinal beams 120. The two longitudinal beams 120 are arranged parallel to each other in the first direction X, and the two cross beams 110 are arranged parallel to each other in the second direction Y. The cross beam 110 and the longitudinal beam 120 are connected end to end; the longitudinal beam 120 is provided with a first flow channel 121, and the fluid can flow along the first flow channel 121 towards the first air vent, and / or the cross beam 110 is provided with a second flow channel 111, and the fluid can flow along the second flow channel 111 towards the second air vent.

[0054] In this way, through the first flow channel 121 provided in the longitudinal beam 120, part of the air flow can be diverted to the first air vent, and the second flow channel 111 provided in the cross beam 110 can divert part of the air flow to the second air vent, which can standardize the air flow direction. When the stage group 200 is in an abnormal state, the pressure in the housing 300 increases, and the air flow can find the air vent nearby along the first flow channel 121 or the second flow channel 111 and discharge out of the housing 300, which can shorten the travel of the gas flow and improve the exhaust efficiency.

[0055] Exemplarily, the edge of the longitudinal beam 120 is serrated, and the groove formed between two adjacent serrations is the first flow channel 121. The middle of the cross beam 110 is provided with an avoidance opening, and the avoidance opening is the second flow channel 111. The avoidance opening can be in the shape of a straight line, a cross, etc.

[0056] Specifically, the thickness of the longitudinal beam 120 is 1 mm to 3 mm.

[0057] Optionally, the battery cell structure further includes a support plate 130 and a protection plate 140. The support plate 130 is located between two cell groups 200 and is fixed to the frame 100. The protection plate 140 is movably connected to the support plate 130. One of the support plate 130 and the protection plate 140 is provided with a placement groove. The tab of the cell group 200 can be placed in the placement groove and clamped between the support plate 130 and the protection plate 140.

[0058] Exemplarily, both ends of the support plate 130 in the second direction Y are respectively fixed to the longitudinal beams 120 on both sides. The electrode plates of the cell group 200 can overlap the support plate 130 in the third direction Z. The support plate 130 and the protection plate 140 can be closed or opened. The tab of the cell group 200 is placed in the placement groove, and the support plate 130 and the protection plate 140 are buckled to clamp the tab for protection. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0059] Optionally, the support plate 130 and the protection plate 140 can be locked by a buckle.

[0060] In this embodiment, the support plate 130 and the protection plate 140 are hinged.

[0061] In other embodiments, the support plate 130 and the protection plate 140 are detachably inserted and arranged.

[0062] Optionally, the frame 100 is provided with mounting holes 122, and convex platforms are arranged on both sides of the support plate 130. The convex platforms are inserted into the mounting holes 122.

[0063] A battery is also provided, including the above-mentioned battery cell structure.

[0064] In addition, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. The structure of the battery cell is characterized in that, Including: A frame (100) sleeved on the peripheries of two cell groups (200), and the tabs of the two cell groups (200) are welded and fixed; An insulating film (400), with the frame (100) and the cell group (200) both wrapped inside the insulating film (400), and the insulating film (400) is provided with a slit; A housing (300), with the insulating film (400), the frame (100) and the cell group (200) all inserted into the housing (300). The side wall of the housing (300) is provided with a ventilation hole, and an explosion-proof valve is arranged at the ventilation hole. The explosion-proof valve can selectively open or close the ventilation hole, and at least part of the explosion-proof valve is installed on the end face of the ventilation hole facing the inner side of the housing (300).

2. The cell structure according to claim 1, wherein, The housing (300) includes a housing main body (310), a positive end cover (320) and a negative end cover (330). The positive end cover (320) and the negative end cover (330) are installed at opposite ends of the housing main body (310) in the first direction (X). The side wall of the housing main body (310) in the second direction (Y) is provided with a first ventilation hole, and a first explosion-proof valve (311) is installed at the first ventilation hole; the positive end cover (320) and / or the negative end cover (330) is provided with a second ventilation hole, and a second explosion-proof valve (331) is installed at the second ventilation hole. The two cell groups (200) are arranged in a mirror image along the first direction (X); The first direction (X) is perpendicular to the second direction (Y).

3. The cell structure according to claim 2, characterized in that, The frame (100) includes two cross beams (110) and two longitudinal beams (120). The two longitudinal beams (120) are arranged in parallel in the first direction (X), the two cross beams (110) are arranged in parallel in the second direction (Y), and the cross beams (110) and the longitudinal beams (120) are connected end to end; The longitudinal beam (120) is provided with a first flow channel (121), and fluid can flow along the first flow channel (121) towards the first ventilation hole, and / or the cross beam (110) is provided with a second flow channel (111), and the fluid can flow along the second flow channel (111) towards the second ventilation hole.

4. The battery cell structure according to claim 3, wherein, The edge of the longitudinal beam (120) is serrated, and the groove formed by two adjacent serrations forms the first flow channel (121).

5. The battery cell structure according to claim 3, wherein, The thickness of the longitudinal beam (120) is 1 mm to 3 mm.

6. The cell structure according to claim 1, wherein It further includes a support plate (130) and a protection plate (140). The support plate (130) is located between the two cell groups (200) and fixed to the frame (100). The protection plate (140) is movably connected to the support plate (130). One of the support plate (130) and the protection plate (140) is provided with a placement groove, and the tab of the cell group (200) can be placed in the placement groove and clamped between the support plate (130) and the protection plate (140).

7. The cell structure according to claim 6, wherein The support plate (130) and the protection plate (140) can be locked by a buckle.

8. The cell structure according to claim 6, characterized in that, The support plate (130) and the protection plate (140) are hinged.

9. The cell structure according to claim 6, wherein, The frame (100) is provided with mounting holes (122), and both sides of the support plate (130) are provided with bosses, and the bosses are inserted into the mounting holes (122).

10. A battery, characterized in that, It includes the battery cell structure according to any one of claims 1-9.

Images