Lower plastic, cover plate assembly and battery

Abstract

The utility model provides lower plastic, a cover plate assembly and a battery, and relates to the technical field of batteries. The lower plastic comprises a main body piece, a connecting piece and an abutting piece, a placement hole is formed in the main body piece, the abutting piece is located in the placement hole, the first end of the connecting piece is connected with the abutting piece, and the second end of the connecting piece is connected with the hole wall of the placement hole; at least part of the connecting piece is complete or bent. In this way, the connecting piece can deform, so that the abutting piece can move relative to the main body piece. When the battery vibrates, the pole group applies force to the abutting piece, and the abutting piece moves relative to the main body piece, so that the force applied by the abutting piece to the pole group is reduced, the risk of damage of a diaphragm in the pole group is reduced, and the risk of damage of the battery caused by short circuit of a positive electrode and a negative electrode of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a lower plastic, a cover plate assembly and a battery. Background Art

[0002] The battery generally includes a pole group, a shell and a cover assembly. The cover assembly is connected to the shell to encapsulate the pole group inside the shell. The cover assembly includes a cover body and a lower plastic. The lower plastic abuts against the pole group to limit the pole group.

[0003] However, when the battery vibrates, the lower plastic will exert a greater force on the electrode group, which increases the risk of damage to the diaphragm in the electrode group. Damage to the diaphragm can cause a short circuit between the positive and negative electrodes of the battery, thereby causing damage to the battery. Utility Model Content

[0004] In view of this, the present application provides a lower plastic, a shell and a cover plate assembly to solve the problem that when the battery vibrates, the lower plastic will exert force on the electrode group, causing a greater risk of damage to the diaphragm in the electrode group.

[0005] According to a first aspect of the present application, a lower plastic is provided, the lower plastic comprising a main body, a connecting member and a contact member, the main body is provided with a placement hole, the contact member is located in the placement hole, the first end of the connecting member is connected to the contact member, the second end of the connecting member is connected to the hole wall of the placement hole, and at least a portion of the connecting member is bent or folded.

[0006] Preferably, the cross section of the abutment member is circular, and the first end of the connecting member and the second end of the connecting member are opposite to or staggered in the radial direction of the abutment member.

[0007] Preferably, the main body comprises a fitting plane and a recessed portion, the recessed portion is recessed from the fitting plane toward the interior of the main body, the recessed portion is provided with the placement hole, and the recessed portion is used to face the explosion-proof valve.

[0008] Preferably, the abutment member and the wall of the mounting hole enclose a first airflow channel, the recessed portion opens a plurality of second airflow channels, and the sum of the area of ​​the first airflow channel and the area of ​​the plurality of second airflow channels is greater than the area of ​​the direct projection of the explosion-proof valve on the main body.

[0009] Preferably, the size of the connecting piece in a direction perpendicular to the fitting plane is 0.2 mm-5 mm.

[0010] Preferably, the dimension of the abutment piece in a direction perpendicular to the fitting plane is 3 mm-7 mm.

[0011] Preferably, the lower plastic further includes a limiting member, the limiting member is fixed to a side of the main body facing away from the fitting plane, and the limiting member includes a limiting plane facing away from the main body;

[0012] The abutment member includes an abutment plane facing away from the main body member, and the distance between the abutment plane and the fitting plane is greater than or equal to the distance between the limiting plane and the fitting plane.

[0013] Preferably, the lower plastic includes a plurality of connecting members, and the plurality of connecting members are arranged at intervals.

[0014] According to a second aspect of the present application, a cover plate assembly is provided, the cover plate assembly comprising a cover plate body and the above-mentioned lower plastic, wherein the lower plastic is connected to the cover plate body.

[0015] According to a third aspect of the present application, a battery is provided, comprising the above-mentioned cover plate assembly.

[0016] In a battery including the lower plastic of the present application, the abutment in the lower plastic is used to abut against the pole group, the first end of the connector is connected to the abutment, and the second end of the connector is connected to the hole wall of the placement hole; at least part of the connector is bent or folded. In this way, the connector can be deformed so that the abutment can move relative to the main body. When the battery vibrates, the pole group applies force to the abutment, and the abutment moves relative to the main body, which reduces the force applied by the abutment to the pole group, reduces the risk of damage to the diaphragm in the pole group, and thus reduces the risk of damage to the battery due to short circuit of the positive and negative poles of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A structural schematic diagram showing a perspective of the lower plastic according to the first embodiment of the utility model;

[0019] Figure 2 A schematic structural diagram showing another perspective of the lower plastic according to the first embodiment of the utility model;

[0020] Figure 3 A structural schematic diagram showing another viewing angle of the lower plastic according to the first embodiment of the utility model;

[0021] Figure 4 A schematic diagram showing the structure of the lower plastic according to the second embodiment of the utility model is shown;

[0022] Figure 5 A schematic diagram showing the structure of the lower plastic according to the third embodiment of the present utility model is shown;

[0023] Figure 6 A diagram showing the relative position of the lower plastic and the pole group;

[0024] Figure 7 A diagram showing the relative positions of the cover plate assembly and the pole group from one perspective;

[0025] Figure 8 A diagram showing the relative positions of the cover plate assembly and the pole group from another perspective.

[0026] Icons: 1-lower plastic; 11-main body; 111-recessed part; 112-receiving hole; 113-second air flow channel; 115-through hole; 116-first air flow channel; 12-connecting piece; 13-abutting piece; 131-side plate; 132-abutting plate; 14-limiting piece; 2-cover body; 3-explosion-proof valve; 4-pole group; 5-pole column; S1-abutting plane; S2-fitting plane; S3-limiting plane. DETAILED DESCRIPTION

[0027] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0028] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0029] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0030] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0031] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0032] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0033] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0034] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0035] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0036] According to a first aspect of the present application, a lower plastic 1 is provided, such as Figures 1 to 5 As shown, the lower plastic 1 includes a main body 11, a connecting member 12 and an abutting member 13. The main body 11 is provided with a placement hole 112. The abutting member 13 is located in the placement hole 112. The first end of the connecting member 12 is connected to the abutting member 13, and the second end of the connecting member 12 is connected to the hole wall of the placement hole 112. At least part of the connecting member 12 is bent or folded. In a battery including the lower plastic 1 of the present application, as Figure 6 As shown, the abutment member 13 in the lower plastic 1 abuts against the electrode group 4, the first end of the connecting member 12 is connected to the abutment member 13, and the second end of the connecting member 12 is connected to the hole wall of the placement hole 112; at least part of the connecting member 12 is bent or folded, so that the connecting member 12 can be deformed so that the abutment member 13 can move relative to the main body 11. When the battery vibrates, the electrode group 4 applies force to the abutment member 13, and the abutment member 13 moves relative to the main body 11, which reduces the force applied by the abutment member 13 to the electrode group 4, reduces the risk of damage to the diaphragm in the electrode group 4, and thus reduces the risk of battery damage caused by short circuit of the positive and negative electrodes of the battery.

[0037] In the lower plastic 1 provided in this application, as Figures 2 to 5 As shown, the cross-section of the abutment 13 can be circular, that is, the abutment 13 can be cylindrical or truncated cone-shaped. The abutment 13 includes a side plate 131 and an abutment plate 132. The side plate 131 surrounds the abutment plate 132. The first end of the connecting member 12 is connected to the side plate 131. The plane of the abutment plate 132 facing away from the side plate 131 is the abutment plane S1. In the battery including the lower plastic 1, the abutment plane S1 abuts against the electrode group 4, thereby limiting the electrode group 4.

[0038] Furthermore, the placement hole 112 may be a circular hole, the axis of the placement hole 112 coincides with the axis of the abutment member 13, and the first end of the connection member 12 and the second end of the connection member 12 are opposite or staggered in the radial direction of the abutment member 13. For example, the connection member 12 may be in a "C", "U", "V" or "W" shape, in which case the first end of the connection member 12 and the second end of the connection member 12 are opposite in the radial direction of the abutment member 13. When the connection member 12 is in a "C" shape, Figure 4 and Figure 6 As shown, the middle portion of the connecting member 12 may protrude in a clockwise direction or a counterclockwise direction relative to the first end of the connecting member 12 and the second end of the connecting member 12. For another example, the connecting member 12 may be in an "S" shape, such as Figure 2 and Figure 3 As shown, the first end of the connecting member 12 is staggered with the second end of the connecting member 12 in the radial direction of the abutment member 13 , and the first end of the connecting member 12 is located on one side of the second end of the connecting member 12 in the clockwise direction or the counterclockwise direction.

[0039] It should be noted that the shapes of the abutment 13 and the seating hole 112 are not limited to the above-mentioned forms. For example, the abutment 13 can be cylindrical and the seating hole 112 can be a square hole; for another example, the abutment 13 can be rectangular and the seating hole 112 can be a round hole; for another example, the abutment 13 can be rectangular and the seating hole 112 can be a square hole.

[0040] Optionally, there are multiple connectors 12, for example, there are 2, 3, 4 or more connectors 12, and the multiple connectors 12 are arranged at intervals.

[0041] like Figures 2 to 5 As shown, the abutment member 13 and the hole wall of the mounting hole 112 enclose a first airflow channel 116. When the abutment member 13 is cylindrical and the mounting hole 112 is a circular hole, the first airflow channel 116 is an annular space. Multiple connecting members 12 divide the first airflow channel 116 into multiple chambers. The multiple chambers can all be used as channels for the infiltration of electrolyte. At the same time, the first airflow channel 116 can also be used as an exhaust channel for the explosion-proof valve 3. When thermal runaway occurs, the gas can flow to the explosion-proof valve 3 through the first airflow channel 116.

[0042] In the lower plastic 1 provided in the present application, the main body 11 can be in the shape of a flat plate, and the main body 11 includes a fitting plane S2. In the cover assembly, the fitting plane S2 fits with the cover body 2. A recessed portion 111 is formed in the middle of the main body 11, and the recessed portion 111 is recessed from the fitting plane S2 to the inside of the main body 11. The recessed portion 111 is rectangular, and the recessed portion 111 is provided with the above-mentioned placement hole 112. In the cover assembly including the lower plastic 1, the recessed portion 111 faces the explosion-proof valve 3, which makes the position of the first airflow channel 116 correspond to the position of the explosion-proof valve 3, so that the gas flows to the explosion-proof valve 3 through the first airflow channel 116. The abutment member 13 protrudes relative to the recessed portion 111 to the side facing away from the fitting plane S2, so that the abutment member 13 abuts against the pole group 4, thereby realizing the limiting of the pole group 4.

[0043] In addition, the recessed portion 111 is provided with a plurality of second airflow channels 113, and the sum of the area of ​​the first airflow channel 116 and the area of ​​the plurality of second airflow channels 113 is greater than the area of ​​the orthographic projection of the explosion-proof valve 3 on the main body 11, so that the lower plastic 1 can provide sufficient exhaust channels, thereby ensuring that when thermal runaway occurs, the airflow flowing to the explosion-proof valve 3 through the first airflow channel 116 and the second airflow channel 113 can break through the explosion-proof valve 3. Optionally, the second airflow channel 113 can be located at any position of the recessed portion 111 except the placement hole 112, and the shape of the second airflow channel 113 can be selected according to the position.

[0044] Optionally, two through holes 115 are provided on the main body 11 , and the two through holes 115 can allow two poles 5 to pass through.

[0045] In addition, the dimension of the connecting member 12 in the direction perpendicular to the bonding plane S2 can be 0.2 mm-5 mm, that is, the thickness of the connecting member 12 is 0.2 mm-5 mm. In this way, the connecting member 12 can be deformed while ensuring its own structure.

[0046] Preferably, the size of the connector 12 in the direction perpendicular to the bonding plane S2 is 0.5 mm to 2 mm. For example, the size of the connector 12 in the direction perpendicular to the bonding plane S2 may be 0.5 mm, 0.7 mm, 0.8 mm, 1 mm, 1.5 mm or 2 mm.

[0047] Optionally, the connecting member 12 may be an elastic rib.

[0048] In the lower plastic 1 provided in the present application, the size of the abutment 13 in the direction perpendicular to the bonding plane S2 is 3 mm-7 mm, so as to ensure that the abutment 13 can limit the electrode group 4. Optionally, the size of the abutment 13 in the direction perpendicular to the bonding plane S2 can be 3 mm, 3.5 mm, 4 mm, 5 mm, 5.5 mm, 6 mm, 6.2 mm or 7 mm, etc.

[0049] Furthermore, the lower plastic 1 also includes a limit member 14, which is fixed on the side of the main body 11 facing away from the fitting plane S2, and the limit member 14 includes a limit plane S3 facing away from the main body 11; the abutment member 13 includes an abutment plane S1 facing away from the main body 11, and the distance between the abutment plane S1 and the fitting plane S2 is greater than or equal to the distance between the limit plane S3 and the fitting plane S2.

[0050] Preferably, the distance between the abutting plane S1 and the fitting plane S2 is greater than the distance between the limiting plane S3 and the fitting plane S2. In this way, when the abutting plane S1 of the abutting member 13 abuts against the electrode group 4, the limiting plane S3 of the limiting member 14 does not contact the electrode group 4. When the battery vibrates and causes the electrode group 4 to move, the limiting plane S3 of the limiting member 14 can limit the electrode group 4. Optionally, the limiting member 14 can be a hollow structure, in which case the limiting plane S3 is ring-shaped.

[0051] Preferably, the number of the limiting members 14 may be two, and the two limiting members 14 are respectively located on two sides of the recessed portion 111 .

[0052] During the use of the lower plastic 1 of the present application, the abutment member 13 abuts against the pole group 4, thereby limiting the position of the pole group 4. When vibration occurs, the vibration is buffered by the deformation of the connecting member 12, reducing the risk of damage to the pole group 4.

[0053] According to a second aspect of the present application, a cover plate assembly is provided, such as Figure 7 and Figure 8 As shown, the cover assembly includes a cover body 2 and the above-mentioned lower plastic 1, and the lower plastic 1 can be riveted to the cover body 2. When the cover assembly is installed on the battery housing, the abutment 13 abuts against the electrode group 4 to limit the position of the electrode group 4. The deformation of the connecting member 12 can reduce the impact of vibration on the electrode group 4, thereby reducing the risk of damage to the electrode group 4.

[0054] According to the third aspect of the present application, a battery is provided, the battery comprising a pole group 4, a shell and the above-mentioned cover assembly, the cover assembly is connected to the shell, so as to encapsulate the pole group 4 in the shell. The abutment 13 in the lower plastic 1 included in the cover assembly abuts against the pole group 4, so as to limit the position of the pole group 4. When the battery vibrates, the connecting member 12 is deformed, so that the force applied by the abutment 13 to the pole group 4 is reduced, thereby reducing the risk of damage to the pole group 4.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A lower plastic, characterized in that: The lower plastic includes a main body, a connecting member and a contact member. The main body is provided with a placement hole. The contact member is located in the placement hole. The first end of the connecting member is connected to the contact member. The second end of the connecting member is connected to the hole wall of the placement hole. At least a portion of the connecting member is bent or folded.

2. The lower plastic according to claim 1, characterized in that: The cross section of the abutment member is circular, and the first end of the connecting member and the second end of the connecting member are directly opposite or staggered in the radial direction of the abutment member.

3. The lower plastic according to claim 1, characterized in that: The main body comprises a fitting plane and a recessed portion, wherein the recessed portion is recessed from the fitting plane toward the interior of the main body, the recessed portion is provided with the placement hole, and the recessed portion is used to face the explosion-proof valve.

4. The lower plastic according to claim 3, characterized in that: The abutment member and the hole wall of the placement hole enclose a first airflow channel, the recessed portion opens a plurality of second airflow channels, and the sum of the areas of the first airflow channel and the plurality of second airflow channels is greater than the area of ​​the positive projection of the explosion-proof valve on the main body.

5. The lower plastic according to claim 3, characterized in that: The dimension of the connecting piece in a direction perpendicular to the bonding plane is 0.2 mm to 5 mm.

6. The lower plastic according to claim 3, characterized in that: The dimension of the abutment piece in a direction perpendicular to the bonding plane is 3 mm to 7 mm.

7. The lower plastic according to claim 3, characterized in that: The lower plastic also includes a limiting member, the limiting member is fixed to a side of the main body that is opposite to the bonding plane, and the limiting member includes a limiting plane that is opposite to the main body; The abutment member includes an abutment plane facing away from the main body member, and the distance between the abutment plane and the fitting plane is greater than or equal to the distance between the limiting plane and the fitting plane.

8. The lower plastic according to any one of claims 1 to 7, characterized in that: The lower plastic includes a plurality of connecting pieces, and the plurality of connecting pieces are arranged at intervals.

9. A cover plate assembly, characterized in that: The cover assembly comprises a cover body and the lower plastic according to any one of claims 1 to 8, wherein the lower plastic is connected to the cover body.

10. A battery, characterized in that: The battery comprises the cover plate assembly of claim 9.

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