Battery cell shell, battery cell, battery and energy storage equipment

Abstract

The utility model provides a battery cell shell, a battery cell, a battery and energy storage equipment. The battery cell shell comprises a shell; the first cover plate is arranged at one end of the shell; a positive terminal and a negative terminal are arranged on the first cover plate; the second cover plate is arranged at the other end of the shell; an anti-explosion valve is arranged on the second cover plate; a shell inner cavity is defined by the shell, the first cover plate and the second cover plate. The insulating spacer is arranged on the inner side of the second cover plate; and in the inner cavity of the shell, the part in front of the insulating spacer and the first cover plate is an energy storage space. The insulating spacer is arranged on the inner side of the second cover plate provided with the anti-explosion valve, so that the spacing distance between the anti-explosion valve and the energy storage unit is increased, contact between metal foreign matter or welding slag at the position of the anti-explosion valve and the energy storage unit is reduced, the risk that the energy storage unit is punctured is reduced, and the wind direction of short circuit is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage devices, and specifically to a battery cell housing, a battery cell, a battery, and an energy storage device. Background Art

[0002] In some traditional battery cells, in order to isolate the explosion-proof valve from the positive and negative terminals, the explosion-proof valve and the positive and negative terminals are respectively placed on opposite end covers of the battery cell shell, but this often leads to a short circuit. Utility Model Content

[0003] Multiple embodiments in this specification provide a battery cell housing, a battery cell, a battery, and an energy storage device that can avoid short circuits.

[0004] The present invention provides a battery cell housing, which includes:

[0005] case;

[0006] a first cover plate, disposed on one end of the housing; a positive terminal and a negative terminal are disposed on the first cover plate;

[0007] A second cover plate is provided at the other end of the shell; an explosion-proof valve is provided on the second cover plate; the shell, the first cover plate and the second cover plate form an inner cavity of the shell;

[0008] An insulating spacer is arranged on the inner side of the second cover plate; in the inner cavity of the shell, the portion between the insulating spacer and the first cover plate is an energy storage space.

[0009] In some embodiments, the insulating spacer has an inner side surface facing away from the second cover plate, and the inner side surface is provided with a first supporting protrusion, and the projection of the first supporting protrusion on the second cover plate at least partially covers the explosion-proof valve; the area of ​​the insulating spacer corresponding to the explosion-proof valve is provided with a plurality of heat dissipation holes passing through the insulating spacer.

[0010] In some embodiments, the insulating spacer has an outer side surface facing the second cover plate; the outer side surface is provided with a first recessed portion, and the projection of the first recessed portion on the second cover plate at least completely covers the explosion-proof valve.

[0011] In some embodiments, the battery cell housing further includes an auxiliary support member; two ends of the auxiliary support member are respectively in contact with the bottom wall of the first recessed portion and the second cover plate.

[0012] In some embodiments, a projection of the auxiliary support member on the second cover plate deviates from the explosion-proof valve.

[0013] In some embodiments, based on the outer side surface of the insulating spacer, the recessed depth of the first recessed portion is equal to the height of the first supporting protrusion.

[0014] In some embodiments, the insulating spacer has an inner side surface facing away from the second cover plate, the inner side surface is provided with a second supporting protrusion, and the projection of the second supporting protrusion on the second cover plate deviates from the explosion-proof valve.

[0015] In some embodiments, a liquid injection hole is provided on the battery cell housing, and the liquid injection hole passes through the second cover plate and the insulating spacer.

[0016] The embodiments of this specification provide a battery cell, including the battery cell shell described in any one of the embodiments of this specification.

[0017] The embodiments of this specification provide a battery, comprising the battery cell described in any one of the embodiments of this specification.

[0018] An embodiment of this specification provides an energy storage device, comprising a battery as described in any one of the embodiments of this specification.

[0019] In the multiple embodiments provided in this specification, an insulating spacer is provided on the inner side of the second cover plate where the explosion-proof valve is provided to increase the spacing distance between the explosion-proof valve and the energy storage unit, reduce the contact between metal foreign matter or welding slag at the explosion-proof valve position and the energy storage unit, reduce the risk of the energy storage unit being punctured, and thus reduce the wind direction of the short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a battery cell casing provided in one embodiment of this specification.

[0021] Figure 2 for Figure 1 A schematic structural diagram of the battery cell casing from another viewing angle is shown.

[0022] Figure 3 for Figure 1 A cross-sectional view of the cell casing is shown.

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the second cover plate, insulating spacer and auxiliary support member.

[0024] Figure 5 for Figure 4 A schematic structural diagram of the structure shown in another viewing direction.

[0025] Figure 6 for Figure 5 Cross-sectional view of the structure shown.

[0026] Figure 7 for Figure 5 Schematic diagram of the structure of the insulating spacer.

[0027] Figure 8 for Figure 6 Schematic diagram of the structure of the middle insulating spacer and auxiliary support.

[0028] Description of Reference Numerals

[0029] 100. Cell shell; 110. Shell; 111. Shell cavity; 120. First cover; 121. Positive terminal; 122. Negative terminal; 130. Second cover; 131. Explosion-proof valve; 140. Insulating spacer; 141. Inner side; 142. First supporting protrusion; 143. Heat dissipation hole; 144. Outer side; 145. First recessed portion; 146. Second supporting protrusion; 150. Auxiliary support member; 160. Liquid injection hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0031] In this specification, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of the local features.

[0032] Unless otherwise indicated, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the art in the technical field of this specification. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the scope of this specification. The term "and / or" used in this specification includes any and all combinations of one or more of the relevant listed items. The singular forms "a", "above", and "the" used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0033] In the description of this specification, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this specification, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. In the description of this specification, the meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0034] In the description of this specification, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of simplifying the description of this specification, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation to this application.

[0035] Throughout this specification, unless otherwise expressly defined, terms such as "installed," "connected," "connect," "fixed," and "disposed" should be interpreted broadly. For example, "connection" can refer to fixed or removable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this specification based on the specific circumstances.

[0036] In the description of this specification, unless otherwise explicitly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0037] The inventors discovered that one of the causes of short circuits in battery cells is the short distance between the explosion-proof valve and the energy storage unit housed within the battery cell housing. This allows foreign metal objects or welding slag near the explosion-proof valve to easily contact and puncture the energy storage unit, causing a short circuit. The energy storage unit can be, but is not limited to, a winding core.

[0038] Based on this, the inventor proposed a battery cell shell, in which an insulating spacer is set on the inner side of the cover plate where the explosion-proof valve is set, so as to increase the distance between the explosion-proof valve and the energy storage unit, reduce the contact between metal foreign matter or welding slag at the explosion-proof valve position and the energy storage unit, reduce the risk of the energy storage unit being punctured, and reduce the direction of short circuit.

[0039] See also Figures 1 to 8The battery cell casing 100 provided in one embodiment of the present specification includes a casing 110, a first cover plate 120, a second cover plate 130, and an insulating spacer 140. The first cover plate 120 is provided at one end of the casing 110; a positive terminal 121 and a negative terminal 122 are provided on the first cover plate 120. The second cover plate 130 is provided at the other end of the casing 110; an explosion-proof valve 131 is provided on the second cover plate 130. The casing 110, the first cover plate 120, and the second cover plate 130 form a casing inner cavity 111. The insulating spacer 140 is provided on the inner side of the second cover plate 130. In the casing inner cavity 111, the portion between the insulating spacer 140 and the first cover plate 120 is an energy storage space.

[0040] It is understood that in this specification, the energy storage space is used to accommodate the energy storage unit, wherein the energy storage unit can be but is not limited to a winding core.

[0041] In the above-mentioned battery cell housing 100, an insulating spacer 140 is provided on the inner side of the second cover plate 130 where the explosion-proof valve 131 is provided to increase the spacing distance between the explosion-proof valve 131 and the energy storage unit, reduce the contact between metal foreign matter or welding slag at the position of the explosion-proof valve 131 and the energy storage unit, reduce the risk of the energy storage unit being punctured, and thus reduce the risk of short circuit.

[0042] In addition, the distance between the explosion-proof valve 131 and the energy storage unit is increased, and the gas generated by the energy storage unit can be temporarily retained between the explosion-proof valve 131 and the energy storage unit, reducing the phenomenon of excessive pressure in the cavity due to the inability to discharge the gas in time, thereby reducing the risk of failure of the energy storage unit.

[0043] Furthermore, the distance between the explosion-proof valve 131 and the energy storage unit is increased, and the gas generated by the energy storage unit can also flow to the position of the explosion-proof valve 131 more quickly, so as to be discharged more smoothly.

[0044] Furthermore, the insulating spacer 140 is non-conductive, thereby playing an insulating role to prevent the explosion-proof valve 131 from short-circuiting with the energy storage unit.

[0045] In addition, the explosion-proof valve 131 and the terminal are located on the cover plates at different ends, so the position of the explosion-proof valve 131 is not restricted, which is more conducive to the discharge of heat.

[0046] In some embodiments, the insulating spacer 140 has an inner side surface 141 facing away from the second cover plate 130. A first support protrusion 142 is provided on the inner side surface 141. The projection of the first support protrusion 142 on the second cover plate 130 at least partially covers the explosion-proof valve 131. The region of the insulating spacer 140 corresponding to the explosion-proof valve 131 is provided with a plurality of heat dissipation holes 143 extending through the insulating spacer 140. The provision of the first support protrusion 142 increases the separation between the explosion-proof valve 131 and the energy storage unit. It is understood that gas generated by the energy storage unit can be dissipated through the heat dissipation holes 143.

[0047] Specifically in this embodiment, the projection of the first supporting protrusion 142 on the second cover plate 130 completely covers the explosion-proof valve 131, so that the interval between the first supporting protrusion 142 and the energy storage unit is maintained more stably.

[0048] Furthermore, specifically in this embodiment, the insulating spacer 140 is provided with a plurality of heat dissipation holes 143, and the plurality of heat dissipation holes 143 are evenly arranged in an array. It is understood that in other feasible embodiments, the plurality of heat dissipation holes 143 may be arranged in other regular or irregular patterns. Furthermore, in other feasible embodiments, the number of heat dissipation holes 143 is not limited to multiple, and may also be one.

[0049] It is understandable that the size of the heat dissipation holes 143 is adaptively determined according to the number of heat dissipation holes 143 and the amount of gas generated by the energy storage unit of the battery cell, which will not be further elaborated here.

[0050] In some embodiments, the insulating spacer 140 has an outer side surface 144 facing the second cover plate 130; this outer side surface 144 is provided with a first recessed portion 145. The projection of the first recessed portion 145 on the second cover plate 130 at least completely covers the explosion-proof valve 131. The provision of the first recessed portion 145 reduces the weight of the insulating spacer 140. The provision of the first recessed portion 145 also increases the temporary storage space for gas released from the energy storage unit, further reducing the risk of excessive pressure within the cavity due to delayed gas discharge, thereby further reducing the risk of energy storage unit failure.

[0051] Specifically in this embodiment, the first recessed portion 145 completely covers the explosion-proof valve 131 and an area within a certain range around the explosion-proof valve 131. It is understandable that in other feasible embodiments, the first recessed portion 145 may also cover only the area of ​​the explosion-proof valve, or cover a larger or smaller area around the explosion-proof valve 131.

[0052] Specifically in this embodiment, the first recessed portion 145 is coaxial with the explosion-proof valve 131. It is understandable that in other embodiments, the axis of the first recessed portion 145 may also be offset from the axis of the explosion-proof valve 131.

[0053] In some embodiments, the cell housing 100 further includes an auxiliary support member 150; both ends of the auxiliary support member 150 abut against the bottom wall of the first recess 145 and the second cover plate 130, respectively. The provision of the auxiliary support member 150 can increase the supporting strength of the insulating spacer 140 and reduce the risk of deformation of the first recess 145 of the insulating spacer 140.

[0054] In some embodiments, the projection of the auxiliary support member 150 on the second cover plate 130 is offset from the explosion-proof valve 131 , thereby preventing the provision of the auxiliary support member 150 from affecting the flow of air toward the explosion-proof valve 131 .

[0055] Optionally, the auxiliary support member 150 is disposed away from the heat dissipation hole 143 to avoid affecting the flow of air.

[0056] Optionally, the auxiliary support member 150 may be, but is not limited to, a metal support member or a polypropylene (PP) support member, as long as it can withstand the temperature of the gas emitted by the energy storage unit.

[0057] Specifically, the auxiliary support member 150 may have any regular or irregular shape.

[0058] Specifically, in this embodiment, there are two auxiliary support members 150, one located on either side of the explosion-proof valve 131, to provide more stable support for the explosion-proof valve 131. It is understood that in other embodiments, the number of auxiliary support members 150 is not limited to two, and may be one or more than three. Similarly, the distribution of the auxiliary support members 150 is not limited to three, and may be at least partially located on one side of the explosion-proof valve 131, or may be arranged around the explosion-proof valve 131.

[0059] In some embodiments, based on the outer side surface 144 of the insulating spacer 140 , the recess depth of the first recess 145 is equal to the protrusion height of the first support protrusion 142 , thereby avoiding excessive increase in the weight of the insulating spacer 140 due to the provision of the first support protrusion 142 .

[0060] In some embodiments, the inner side 141 of the insulating spacer 140 is provided with a second supporting protrusion 146 , the projection of the second supporting protrusion 146 on the second cover 130 being offset from the explosion-proof valve 131 . The provision of the second supporting protrusion 146 enhances the supporting stability of the insulating spacer 140 .

[0061] Specifically, in this embodiment, the insulating spacer 140 is provided with two second support protrusions 146, symmetrically located on either side of the first support protrusion 142. It is understood that in other feasible embodiments, the number of second support protrusions 146 on the insulating spacer 140 is not limited to two, but may be one or more than two. Furthermore, the arrangement of the second support protrusions 146 is not limited to this, and may be distributed in any regular or irregular pattern.

[0062] The battery cell housing 100 is provided with a liquid injection hole 160 , which passes through the second cover plate 130 and the insulating spacer 140 .

[0063] Optionally, the ratio of the length of the energy storage space to the length of the cell housing 100 is within a range of 0.3 to 0.7, such as 0.3, 0.4, 0.5, 0.6 or 0.7. It should be noted that the length direction refers to the direction from the first cover plate 120 to the second cover plate 130.

[0064] An embodiment of the present specification provides a battery cell, which includes the battery cell shell provided in any embodiment of the present specification.

[0065] The above-mentioned battery cell is provided with an insulating spacer on the inner side of the second cover plate where the explosion-proof valve is provided to increase the spacing distance between the explosion-proof valve and the energy storage unit, reduce the contact between metal foreign matter or welding slag at the explosion-proof valve position and the energy storage unit, reduce the risk of the energy storage unit being punctured, and thus reduce the risk of short circuit.

[0066] An embodiment of the present specification provides a battery, which includes the battery cell provided in any embodiment of the present specification.

[0067] The above-mentioned battery is provided with an insulating spacer on the inner side of the second cover plate where the explosion-proof valve is provided to increase the spacing distance between the explosion-proof valve and the energy storage unit, reduce the contact between metal foreign matter or welding slag at the position of the explosion-proof valve and the energy storage unit, reduce the risk of the energy storage unit being punctured, and thus reduce the risk of short circuit.

[0068] An embodiment of this specification provides an energy storage device, which includes the battery provided in any embodiment of this specification.

[0069] The above-mentioned energy storage device is provided with an insulating spacer on the inner side of the second cover plate where the explosion-proof valve is provided to increase the spacing distance between the explosion-proof valve and the energy storage unit, reduce the contact between metal foreign matter or welding slag at the position of the explosion-proof valve and the energy storage unit, reduce the risk of the energy storage unit being punctured, and thus reduce the direction of the short circuit.

[0070] It can be understood that in the various embodiments in this specification, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this specification.

[0071] It can be understood that the various implementation methods described in this specification can be implemented individually or in combination, and the embodiments of this specification are not limited to this.

[0072] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0073] The above description is merely a specific embodiment of this specification, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this specification should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery cell shell, characterized in that: The battery cell housing comprises: case; a first cover plate, disposed on one end of the housing; a positive terminal and a negative terminal are disposed on the first cover plate; A second cover plate is provided at the other end of the housing; an explosion-proof valve is provided on the second cover plate; the housing, the first cover plate and the second cover plate form an inner cavity of the housing; and An insulating spacer is arranged on the inner side of the second cover plate; in the inner cavity of the shell, the portion between the insulating spacer and the first cover plate is an energy storage space.

2. The battery cell housing according to claim 1, wherein: The insulating spacer has an inner side surface facing away from the second cover plate, and the inner side surface is provided with a first supporting protrusion. The projection of the first supporting protrusion on the second cover plate at least partially covers the explosion-proof valve; the area of ​​the insulating spacer corresponding to the explosion-proof valve is provided with a plurality of heat dissipation holes passing through the insulating spacer.

3. The battery cell housing according to claim 1, wherein: The insulating spacer has an outer side surface facing the second cover plate; the outer side surface is provided with a first recessed portion, and the projection of the first recessed portion on the second cover plate at least completely covers the explosion-proof valve.

4. The battery cell housing according to claim 3, wherein: The battery cell housing further includes an auxiliary support member; two ends of the auxiliary support member are respectively in contact with the bottom wall of the first recessed portion and the second cover plate.

5. The battery cell casing according to claim 4, characterized in that: The projection of the auxiliary support member on the second cover plate deviates from the explosion-proof valve.

6. The battery cell casing according to claim 2, characterized in that: The insulating spacer has an outer side surface facing the second cover plate; the outer side surface is provided with a first recessed portion, and the projection of the first recessed portion on the second cover plate at least completely covers the explosion-proof valve.

7. The battery cell casing according to claim 6, characterized in that: The battery cell housing further includes an auxiliary support member; two ends of the auxiliary support member are respectively in contact with the bottom wall of the first recessed portion and the second cover plate.

8. The battery cell casing according to claim 7, characterized in that: The projection of the auxiliary support member on the second cover plate deviates from the explosion-proof valve.

9. The battery cell casing according to claim 6, characterized in that: Taking the outer side surface of the insulating spacer as a reference, the recessed depth of the first recessed portion is equal to the height of the first supporting protrusion.

10. The battery cell casing according to any one of claims 1 to 9, characterized in that: The insulating spacer has an inner side surface facing away from the second cover plate. The inner side surface is provided with a second supporting protrusion. The projection of the second supporting protrusion on the second cover plate deviates from the explosion-proof valve.

11. The battery cell casing according to any one of claims 1 to 9, characterized in that: The battery cell shell is provided with a liquid injection hole, and the liquid injection hole passes through the second cover plate and the insulating spacer.

12. A battery cell, characterized in that: The battery cell shell comprises the battery cell shell according to any one of claims 1 to 11.

13. A battery, characterized in that: Including the battery cell according to claim 12.

14. An energy storage device, characterized in that: Including the battery according to claim 13.

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