Battery cell shell structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell shell structure and a battery, the battery cell shell structure comprises a shell body, a first cover plate, a pole group and a heat-resistant limiting bulge, the shell body defines a space for accommodating the pole group, the first cover plate covers one end of the shell body in a first direction, and the first cover plate is provided with an anti-explosion valve. The shell body is provided with a heat-resistant limiting bulge, and the heat-resistant limiting bulge is fixedly arranged on the inner side of the shell body and between the first cover plate and the pole group, so that the pole group and the first cover plate are arranged at an interval along the first direction. According to the battery cell shell structure and the battery provided by the invention, the stability of the exhaust gap between the pole group and the first cover plate can be effectively ensured through the heat-resistant limiting bulge on the shell body, and when the battery is subjected to thermal runaway, the heat-resistant limiting bulge can still keep the limiting effectiveness on the pole group along with the sharp rise of the internal temperature of the battery cell; the phenomenon that the explosion-proof valve is blocked by the pole group under the impact of airflow is avoided, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell shell structure and a battery. BACKGROUND

[0002] Lithium ion battery has become a representative of modern high-performance battery due to its high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight and small size.

[0003] The battery cell usually includes a shell, a cover plate, a lower plastic part and a pole group. The shell and the cover plate form an enclosed space for accommodating the pole group. The lower plastic part is arranged on the side of the cover plate facing the pole group. An explosion-proof valve is usually arranged on the cover plate for discharging high-pressure gas in the shell. The pole group is mainly pressed by the lower plastic part to achieve the limiting of the pole group by the shell.

[0004] However, the insulating material used to make the lower plastic part is generally made of plastic material (such as PP material), which has a low melting point. When the battery overheats, the limiting effect of the lower plastic part on the pole group is easily lost due to the melting of the lower plastic part, which makes the pole group easily pressed against the inner side of the cover plate under the impact of the high-pressure gas flow in the shell, thereby blocking the explosion-proof valve, affecting the smoothness of the exhaust of the explosion-proof valve, reducing the exhaust effect of the explosion-proof valve, and reducing the safety performance of the battery cell. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present application is to provide a battery cell shell structure and a battery to solve the technical problem that the insulating material used to make the lower plastic part is generally made of plastic material, which has a low melting point. When the battery overheats, the limiting effect of the lower plastic part on the pole group is easily lost due to the melting of the lower plastic part, which makes the pole group easily pressed against the inner side of the cover plate under the impact of the high-pressure gas flow in the shell, thereby blocking the explosion-proof valve, affecting the smoothness of the exhaust of the explosion-proof valve, reducing the exhaust effect of the explosion-proof valve, and reducing the safety performance of the battery cell.

[0006] According to the first aspect of the present application, a battery cell shell structure is provided, which includes a shell body, a first cover plate, a pole group and a heat-resistant limiting protrusion. The shell body forms a space for accommodating the pole group. The first cover plate is arranged at one end of the shell body in a first direction and is provided with an explosion-proof valve.

[0007] The shell body is provided with the heat-resistant limiting protrusion, which is fixedly arranged on the inner side of the shell body between the first cover plate and the pole group, so that the pole group and the first cover plate are arranged in a spaced manner along the first direction.

[0008] Preferably, an insulating piece is further included, which is arranged on a side of the first cover plate facing the pole group.

[0009] In the first direction, at least part of the heat-resistant limiting protrusion is arranged in overlap with the insulating piece.

[0010] Preferably, an outer wall of the insulating piece is provided with a relief groove, and the heat-resistant limiting protrusion is arranged in the relief groove.

[0011] Preferably, the relief groove extends along the first direction, and the relief groove is open at an end of the insulating piece away from the first cover plate.

[0012] Preferably, the shell body includes two narrow edge surfaces arranged opposite to each other along a second direction and two large surfaces arranged opposite to each other along a third direction, the heat-resistant limiting protrusion is arranged on the narrow edge surface, the second direction and the third direction intersect with each other, and the first direction intersects with a plane determined by the second direction and the third direction.

[0013] Preferably, a plurality of heat-resistant limiting protrusions are arranged on each of the narrow edge surfaces, and the plurality of heat-resistant limiting protrusions are arranged at intervals along the third direction.

[0014] Preferably, the heat-resistant limiting protrusion and the shell body are formed as an integral connection.

[0015] Preferably, a second cover plate is further included, which is arranged at an end of the shell body away from the first cover plate.

[0016] Preferably, a first pole and a second pole are further included, which are arranged on the first cover plate and the second cover plate, respectively.

[0017] According to the second aspect of the present application, a battery is provided, which includes the battery cell shell structure according to any one of the technical solutions, and thus has all the beneficial technical effects of the battery cell shell structure, which will not be described herein again.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The battery cell shell structure provided by the application can effectively ensure the stability of the exhaust gap between the pole group and the first cover plate through the heat-resistant limiting protrusion on the shell body. When the battery is in thermal runaway, the heat-resistant limiting protrusion can still effectively limit the pole group as the temperature in the battery cell rises sharply, avoiding the phenomenon that the pole group blocks the explosion-proof valve under the impact of airflow, thereby improving the safety of the battery.

[0020] In order to make the above objectives, characteristics and advantages of the present application more apparent, clear and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 The explosion structure schematic diagram of the battery cell shell structure provided by the embodiment of the present application is shown in the figure.

[0023] Figure 2 The Figure 1 The enlarged structure schematic diagram of the battery cell shell structure provided by the present application at A is shown in the figure.

[0024] Figure 3 The Figure 1 The enlarged structure schematic diagram of the battery cell shell structure provided by the present application at B is shown in the figure.

[0025] Figure 4 The partial structure schematic diagram of another explosion structure of the battery cell shell structure provided by the embodiment of the present application is shown in the figure.

[0026] Reference signs:

[0027] 1-shell body; 11-narrow edge surface; 12-large surface; 2-first cover plate; 21-explosion-proof valve; 22-first pole; 3-heat-resistant limiting protrusion; 4-insulating piece; 41-avoidance groove; 5-pole group; 6-second cover plate.

[0028] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application.

[0030] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application.

[0031] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Figures 1 to 4 The battery and the battery cell shell structure according to some embodiments of the present application are described.

[0035] Referring to Figures 1 to 4 As shown in the drawings, the embodiments of the first aspect of the present application provide a battery cell shell structure, which comprises a shell body 1, a first cover plate 2, a pole group 5 and a heat-resistant limiting protrusion 3. The shell body 1 is arranged to form a space for accommodating the pole group 5. The first cover plate 2 is arranged at one end of the shell body 1 in the first direction F1, and the first cover plate 2 is provided with a pressure relief valve 21. The shell body 1 is provided with the heat-resistant limiting protrusion 3, which is fixedly arranged on the inner side of the shell body 1 and arranged between the first cover plate 2 and the pole group 5, so that the pole group 5 and the first cover plate 2 are arranged in the first direction F1.

[0036] According to the cell housing structure provided by the above technical features, a heat-resistant limiting protrusion 3 is provided on the side of the housing body 1 near the first cover where the explosion-proof valve 21 is located, and is fixedly connected to the housing body 1. The heat-resistant limiting protrusion 3 is positioned between the first cover plate 2 and the electrode group 5. In this way, the heat-resistant limiting protrusion 3 on the housing body 1 can effectively ensure the stability of the venting gap between the electrode group 5 and the first cover plate 2. Furthermore, when the battery experiences thermal runaway, as the internal temperature of the cell rises sharply, the heat-resistant limiting protrusion 3 can still maintain its limiting effect on the electrode group 5, preventing the electrode group 5 from blocking the explosion-proof valve 21 under the impact of airflow, thereby improving the safety of the battery.

[0037] like Figures 1 to 4 As shown in the figure, F1 can be an example of the first direction F1 described above, F2 can be an example of the second direction F2 described below, and F3 can be an example of the third direction F3 described below. The second direction F2 and the third direction F3 intersect, and the first direction F1 intersects the plane defined by the second direction F2 and the third direction F3. Preferably, any two of the three directions F1, F2, and F3 are perpendicular to each other to accommodate most square battery cells.

[0038] Preferably, such as Figure 1 , Figure 2 and Figure 4 As shown, the aforementioned cell housing structure may further include an insulating member 4, which is disposed on the side of the first cover plate 2 facing the electrode group 5. In the first direction F1, at least a portion of the heat-resistant limiting protrusion 3 overlaps with the insulating member 4. Thus, on the one hand, insulation is achieved between the first cover plate 2 and the electrode group 5; on the other hand, the space occupied by the heat-resistant limiting protrusion 3 in the first direction F1 of the cell housing structure is effectively reduced, thereby improving the space utilization rate of the battery.

[0039] Preferably, such as Figure 4 As shown, the dimensions of the portion of the insulating member 4 extending into the shell body 1 along the first direction F1 (i.e., Figure 4 The S1 value shown is greater than or equal to the distance between the end of the heat-resistant limiting protrusion 3 facing away from the first cover plate 2 and the first cover plate 2 (i.e., Figure 4 (S2 value shown) Thus, when the insulating member 4 is assembled at the end of the housing body 1, the heat-resistant limiting protrusion 3 can be hidden inside the insulating member 4 to further reduce the influence of the heat-resistant limiting protrusion 3 on the space of the battery cell in the first direction F1.

[0040] Preferably, such as Figure 1 , Figure 2 and Figure 4As shown, the outer wall of the insulation piece 4 can be provided with a relief groove 41, and the heat-resistant limiting protrusion 3 is arranged in the relief groove 41, so as to further reduce the space occupied by the heat-resistant limiting protrusion 3 in the shell structure of the battery cell, and further improve the space utilization of the battery.

[0041] Preferably, as shown in Figure 2 and Figure 4 , the relief groove 41 extends along the first direction F1, and the relief groove 41 is open at one end of the insulation piece 4 away from the first cover plate 2, so as to facilitate the assembly of the insulation piece 4 and the heat-resistant limiting protrusion 3.

[0042] In an embodiment, as shown in Figures 1 to 4 , the shell body 1 can include two narrow edge surfaces 11 arranged opposite to each other along the second direction F2 and two large surfaces 12 arranged opposite to each other along the third direction F3, wherein the size of the large surface 12 in the second direction F2 is greater than the size of the narrow edge surface 11 in the third direction F3, so as to adapt to most square battery cell structures today.

[0043] Preferably, as shown in Figure 1 , Figure 2 and Figure 4 , the heat-resistant limiting protrusion 3 can be arranged on the narrow edge surface 11, so as to reduce the influence of the heat-resistant limiting protrusion 3 on the structure of the insulation piece 4, and further reduce the cost of modifying the existing battery cell to the battery cell shell structure provided by the present application.

[0044] Preferably, as shown in Figure 2 and Figure 4 , a plurality of heat-resistant limiting protrusions 3 can be arranged on each narrow edge surface 11, and the plurality of heat-resistant limiting protrusions 3 are arranged at intervals along the third direction F3, so as to improve the stability of the heat-resistant limiting protrusion 3 limiting the pole group 5.

[0045] Preferably, the heat-resistant limiting protrusion 3 can be a high-temperature-resistant piece fixedly connected with the shell body 1, for example, the heat-resistant limiting protrusion 3 can be a metal piece, a ceramic piece, etc., so that when the battery is in thermal runaway, the limiting effect of the lower plastic piece on the pole group 5 is lost due to the melting of the lower plastic piece, and the heat-resistant limiting protrusion 3 can still maintain the limiting effectiveness of the pole group 5.

[0046] Preferably, the heat-resistant limiting protrusion 3 and the shell body 1 are formed as an integral connecting piece, so as to improve the connection stability of the heat-resistant limiting protrusion 3 and the shell body 1.

[0047] Optionally, as shown in Figure 2 and Figure 4As shown, the heat-resistant limiting protrusion 3 can be formed by stamping of the shell body 1, on the one hand, facilitating the processing of the heat-resistant limiting protrusion 3; on the other hand, further improving the connection stability of the heat-resistant limiting protrusion 3 and the shell body 1.

[0048] In an embodiment, as shown in Figure 1 and Figure 3 As shown, the above-mentioned battery cell shell structure can further include a second cover plate 6, which is arranged at the end of the shell body 1 away from the first cover plate 2, so as to facilitate the assembly of the battery cell.

[0049] Optionally, the side of the second cover plate 6 facing the pole group 5 can also be provided with the above-mentioned insulating member 4, so as to realize the insulation between the second cover plate 6 and the pole group 5.

[0050] Preferably, as shown in Figures 1 to 3 The above-mentioned battery cell shell structure can further include a first pole 22 and a second pole, both of which are arranged on the first cover plate 2 and the second cover plate 6, respectively.

[0051] However, not limited thereto, both the first pole and the second pole can also be arranged on the first cover plate, which is not shown in the figure. Alternatively, both the first pole and the second pole can also be arranged on the second cover plate, which is not shown in the figure.

[0052] The embodiments of the second aspect of the present application also provide a battery including the battery cell shell structure according to any one of the above-mentioned embodiments, thus having all the beneficial technical effects of the battery cell shell structure, which will not be described here.

[0053] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the above-mentioned embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric cell casing structure, characterized by comprising: The shell body, the first cover plate, the pole group and the heat-resistant limiting protrusion, the shell body surrounds to form a space for accommodating the pole group, the first cover plate is covered on one end of the shell body in the first direction, and the first cover plate is provided with an explosion-proof valve; The shell body is provided with the heat-resistant limiting protrusion, the heat-resistant limiting protrusion is fixedly arranged on the inner side of the shell body, and is arranged between the first cover plate and the pole group, so that the pole group and the first cover plate are arranged in the first direction.

2. The electric cell case structure according to claim 1, wherein Further comprising an insulating piece, the insulating piece is arranged on the side of the first cover plate facing the pole group; In the first direction, at least part of the heat-resistant limiting protrusion is arranged overlapping the insulating piece.

3. The electric cell case structure according to claim 2, characterized by, The outer wall of the insulating piece is provided with a relief groove, and the heat-resistant limiting protrusion is arranged in the relief groove.

4. The electric cell case structure according to claim 3, wherein The relief groove extends in the first direction, and the relief groove is open at the end of the insulating piece away from the first cover plate.

5. The electric cell case structure according to any one of claims 1 to 4, characterized by, The shell body includes two narrow sides arranged opposite to each other in a second direction and two large faces arranged opposite to each other in a third direction, the heat-resistant limiting protrusion is arranged on the narrow side, the second direction and the third direction intersect each other, and the first direction intersects the plane determined by the second direction and the third direction.

6. The electric cell case structure according to claim 5, wherein A plurality of heat-resistant limiting protrusions are arranged on each of the narrow sides, and the plurality of heat-resistant limiting protrusions are arranged in the third direction.

7. The electric cell casing structure according to any one of claims 1 to 4, characterized by, The heat-resistant limiting protrusion and the shell body are formed as an integral connection.

8. The electric cell housing structure according to claim 1, characterized by, Further comprising a second cover plate, the second cover plate is covered on the end of the shell body away from the first cover plate.

9. The electric cell housing structure according to claim 8, characterized by, Further comprising a first pole column and a second pole column, the first pole column and the second pole column are arranged on the first cover plate and the second cover plate respectively.

10. A battery, characterized by The electric cell shell structure of any one of claims 1 to 9 is included.

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