Battery cell cover plate, battery cell and battery cell module
By setting high-temperature resistant parts on the outer wall of the plastic boss under the battery cover plate, and using high-temperature resistant adhesive bonding, the problem of plastic decomposition failure when the battery core is thermally out of control is solved, and the effect of pole group limit and high-temperature gas discharge is achieved. Improves the safety performance of the battery cell.
Patent Information
- Application Number
- CN202420351968.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-23
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-02-23
AI Technical Summary
The lower plastic in the existing battery cell cover plate decomposes and fails when the battery cell gets thermally out of control, resulting in the loss of the pole limit effect, which leads to the problem of the pole group squirting and blocking the exhaust passage of the explosion-proof valve.
A battery cell cover plate is designed, and the lower plastic forms a boss, and a high-temperature resistant member is provided on the outer wall of the boss. The high-temperature resistant member is bonded to the lower plastic through the high-temperature resistant adhesive to form a through hole to contact the outside.
When the battery cell is thermally out of control, the high-temperature resistant parts remain stable, preventing the pole group from squirting, delaying the battery cell temperature rise speed, reducing the peak temperature, and improving the thermal runaway test pass rate and overall safety performance of the battery cell.
Smart Images
Figure CN222530577U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery cell structures, and in particular to a battery cell cover, a battery cell and a battery cell module. Background Art
[0002] In the existing battery cell cover, a lower plastic is often provided to play the role of pressing the electrode group and hot-melting and fixing it with the bare battery cell insulation sheet. However, the existing lower plastic of the cover is usually made of PP material, that is, the melting point of the lower plastic is basically 160-170°C. When the battery cell has thermal runaway, the internal temperature of the battery cell can reach above 400°C, and the plastic under the cover will quickly decompose and fail. Under the action of the high-temperature and high-pressure gas inside the battery cell, the electrode group inside the shell is no longer restricted and loses balance, and then the electrode group moves to the side of the explosion-proof valve and blocks the exhaust channel of the explosion-proof valve. Utility Model Content
[0003] In view of this, the purpose of the present application is to provide a battery cover, a battery cell and a battery cell module to solve the problem that the lower plastic in the existing battery cover will decompose and fail when the battery cell has thermal runaway, resulting in the disappearance of the limiting effect on the electrode group.
[0004] According to the above purpose, the first aspect of the present utility model provides a battery cover, wherein the battery cover comprises:
[0005] A main body, wherein a lower plastic is disposed at the bottom of the main body, and the lower plastic is formed with a boss protruding in a direction away from the main body; and
[0006] The high temperature resistant component corresponds to the boss and is arranged on the outer wall of the boss. The high temperature resistant component is provided with a plurality of through holes so that the lower plastic is in contact with the external space.
[0007] Preferably, the high temperature resistant component is bonded to the lower plastic by high temperature resistant glue.
[0008] Preferably, the thickness of the high temperature resistant adhesive is 0.03 mm to 0.1 mm.
[0009] Preferably, the thickness of the high temperature resistant component is 0.15 mm to 0.3 mm.
[0010] Preferably, the thickness of the lower plastic is 0.5 mm to 1.5 mm.
[0011] Preferably, the protruding height of the boss is 4 mm to 8 mm.
[0012] Preferably, along the width direction of the battery cell cover plate, the through holes are distributed at both ends of the high temperature resistant component.
[0013] Preferably, a plurality of heat dissipation holes are provided at the bottom of the high temperature resistant component.
[0014] According to a second aspect of the utility model, a battery cell is provided, wherein the battery cell comprises the battery cell cover plate as described above.
[0015] According to a third aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell as described above.
[0016] According to the battery cover, battery cell and battery cell module of the utility model, the lower plastic is formed with a boss protruding in the direction away from the battery cover body, and the boss can achieve a limiting effect on the electrode group; in addition, the outer wall of the boss is provided with a corresponding high-temperature resistant part, so that when the temperature inside the battery cell reaches the temperature that can melt the lower plastic of PP material, the high-temperature resistant part will not melt and can play a good role in fixing the electrode group, thereby preventing the electrode group from moving up and down; further, the high-temperature resistant part can also provide support for the rapid discharge of high-temperature and high-pressure gas along the plastic exhaust channel under the cover, which can effectively delay the speed of heating of the battery cell due to thermal runaway, reduce the peak temperature, greatly improve the pass rate of thermal runaway test of the battery cell, and improve the safety performance of the battery cell and even the entire PACK package.
[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] 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.
[0019] Figure 1 is a schematic diagram of a battery cell cover according to an embodiment of the utility model;
[0020] Figure 2 It is a side view of a battery cell cover according to an embodiment of the utility model.
[0021] Icon: 1-main body; 2-lower plastic; 20-boss; 3-high temperature resistant part; 30-through hole; 31-heat dissipation hole. DETAILED DESCRIPTION
[0022] 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.
[0023] 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.
[0024] 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.
[0025] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] like Figure 1 to Figure 2 As shown, according to the first aspect of the utility model, a battery cell cover is provided, which includes a main body 1 and a high temperature resistant part 3. A lower plastic 2 is provided at the bottom of the main body 1, and the lower plastic 2 is formed with a boss 20 protruding in a direction away from the main body 1. The boss 20 can limit the pole group in the battery cell to support the exhaust channel, thereby ensuring the safety performance of the battery cell when in use.
[0032] Hereinafter, the specific structures of the above-mentioned parts of the battery cell cover according to the present invention will be described in detail.
[0033] In this embodiment, if Figure 1 to Figure 2As shown, the high temperature resistant part 3 corresponds to the boss 20 and is arranged at the outer wall of the boss 20, that is, the limiting effect of the lower plastic 2 on the electrode group is actually the limiting effect of the high temperature resistant part 3 on the electrode group. Further, the high temperature resistant part 3 in this embodiment is bonded to the lower plastic 2 by a high temperature resistant glue, so that the stability of the connection between the high temperature resistant part 3 and the lower plastic 2 can be better ensured under high temperature conditions. Specifically, the thickness of the high temperature resistant glue is 0.03mm~0.1mm, the thickness T1 of the high temperature resistant part 3 is 0.15mm~0.3mm (preferably 0.2mm), and the overall thickness T2 of the lower plastic 2 is 0.5mm~1.5mm (preferably 1mm); in addition, the protruding height H of the boss 20 (that is, the distance between the bottom of the boss 20 away from the main body 1 and the bottom of the lower plastic 2) is 4mm~8mm, and the height is preferably 6mm. The above numerical range is the optimal range that can achieve the above technical effects after multiple tests, but the specific dimensions of each component still need to be determined comprehensively based on actual conditions.
[0034] In addition, in this embodiment, Figure 1 As shown, along the width direction of the cell cover, the high temperature resistant part 3 is provided with a plurality of through holes 30 at both ends, through which the lower plastic 2 can be in contact with the external space, thereby facilitating the stable hot melting of the insulating sheet (not shown in the figure, which is an inherent component of the cell) and the lower plastic 2. It should be noted that there is no fixed restriction on the number, shape and size of the through holes 30, as long as the above technical effects can be achieved.
[0035] In addition, a plurality of heat dissipation holes 31 are provided at the bottom of the high temperature resistant component 3 to facilitate heat dissipation of the battery core.
[0036] According to the battery cell cover of the utility model, the lower plastic 2 is formed with a boss 20 protruding in a direction away from the battery cell cover body 1, and the boss 20 can achieve a limiting effect on the electrode group; in addition, the outer wall of the boss 20 is provided with a corresponding high temperature resistant part 3, so that when the temperature inside the battery cell reaches the temperature that can melt the lower plastic 2 made of PP material, the high temperature resistant part 3 will not melt and can play a good role in fixing the electrode group, thereby preventing the electrode group from moving up and down; further, the high temperature resistant part 3 can also provide support for the rapid discharge of high temperature and high pressure gas along the exhaust channel of the lower plastic 2 of the cover, which can effectively delay the speed of heating of the battery cell due to thermal runaway, reduce the peak temperature, greatly improve the pass rate of thermal runaway test of the battery cell, and improve the safety performance of the battery cell and even the entire PACK package.
[0037] According to the second aspect of the utility model, a battery cell is provided, wherein the battery cell comprises the battery cell cover as described above. The battery cell also comprises an insulating sheet, and the insulating sheet is hot-melt-connected with the lower plastic 2 (the boss 20) through the through hole 30 of the high temperature resistant part 3 to increase the stability of the battery cell cover and the battery cell as a whole.
[0038] According to a third aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell as described above.
[0039] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims
1. A battery cell cover, characterized in that: The battery cover plate comprises: A main body, wherein a lower plastic is disposed at the bottom of the main body, and the lower plastic is formed with a boss protruding in a direction away from the main body; and The high temperature resistant component corresponds to the boss and is arranged on the outer wall of the boss. The high temperature resistant component is provided with a plurality of through holes so that the lower plastic is in contact with the external space.
2. The cell cover plate according to claim 1, characterized in that: The high temperature resistant part is bonded to the lower plastic by high temperature resistant glue.
3. The cell cover plate according to claim 2, characterized in that: The thickness of the high temperature resistant adhesive is 0.03 mm to 0.1 mm.
4. The battery cover according to claim 2, characterized in that: The thickness of the high temperature resistant part is 0.15 mm to 0.3 mm.
5. The cell cover plate according to claim 2, characterized in that: The thickness of the lower plastic is 0.5 mm to 1.5 mm.
6. The cell cover plate according to claim 1, characterized in that: The protruding height of the boss is 4 mm to 8 mm.
7. The cell cover plate according to claim 1, characterized in that: Along the width direction of the battery cell cover plate, the through holes are distributed at both ends of the high temperature resistant component.
8. The cell cover plate according to claim 1, characterized in that: A plurality of heat dissipation holes are arranged at the bottom of the high temperature resistant component.
9. A battery cell, characterized in that: The battery cell comprises the battery cell cover plate according to any one of claims 1 to 8.
10. A battery cell module, characterized in that: The battery cell module includes the battery cell as claimed in claim 9.