Battery cell, battery cell module and battery pack
By setting two explosion-proof valves and protective patches on both ends of the housing of the long battery cell, the problem of pressure imbalance in the battery cell and poor exhaust effect is solved, and more efficient gas discharge and explosion-proof valve opening is achieved.
Patent Information
- Application Number
- CN202420324852.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-21
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-02-21
AI Technical Summary
The existing long battery cell is equipped with only one explosion-proof valve, which causes the internal high-temperature and high-pressure gas exhaust path and small area, which leads to the internal pressure imbalance of the battery cell, and the pole group squirms and blocks the pressure relief port of the explosion-proof valve, affecting the exhaust gas. Effect.
The first explosion-proof valve and the second explosion-proof valve are respectively arranged at both ends of the housing length direction of the battery cell, and a protective patch is provided at the second explosion-proof valve to form a gap for preventing contamination to ensure that the gas inside the battery cell can Effective discharge.
By setting up two explosion-proof valves, the exhaust path of high-temperature and high-pressure gas inside the battery cell is shortened, the exhaust area is increased, the probability and timeliness of explosion-proof valve opening are improved, and the pressure imbalance in the battery cell and the pole group squirming are avoided. Explosion-proof valve blockage problem.
Smart Images
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Abstract
Description
Technical Field
[0001] The present application relates to the field of battery cell structures, and in particular to a battery cell, a battery cell module and a battery pack. Background Art
[0002] At present, square battery cells are only equipped with one explosion-proof valve. For large-capacity long battery cells, when short-circuit thermal runaway occurs inside, the internal gas can only be discharged through an explosion-proof valve on the cover plate at one end of the battery. The exhaust path is long and the exhaust area is small. In addition, since the long battery cell has an explosion-proof valve pressure relief port only at one end, the pressure on the other side is usually higher. Inside the battery cell, the air pressure gradually decreases from the side without the explosion-proof valve to the side with the explosion-proof valve, which causes an imbalance in the internal pressure of the battery cell, pushing the pole group to move to the side with the explosion-proof valve, and ultimately causing the explosion-proof valve pressure relief port to be blocked by the pole group, affecting the exhaust effect. Utility Model Content
[0003] In view of this, the purpose of the present application is to provide a battery cell, a battery cell module and a battery pack to solve the problem of internal pressure imbalance of the battery cell caused by the fact that the existing long battery cell is only provided with one explosion-proof valve and is not convenient for exhaust.
[0004] According to the above purpose, the first aspect of the present utility model provides a battery cell, wherein the battery cell comprises:
[0005] Pole group;
[0006] A shell, wherein the pole group is located inside the shell; a first explosion-proof valve, a second explosion-proof valve and a protective patch corresponding to the second explosion-proof valve are arranged at the end of the shell in the length direction, and the protective patch is formed with a notch for preventing the second explosion-proof valve from being contaminated.
[0007] Preferably, the shell includes a first cover plate, a main shell and a second cover plate connected in sequence; the first explosion-proof valve and the second explosion-proof valve are respectively arranged at the first cover plate and the second cover plate; or, the first explosion-proof valve and the second explosion-proof valve are both located at the first cover plate or the second cover plate.
[0008] Preferably, the second cover plate is also provided with a liquid injection port.
[0009] Preferably, when the second explosion-proof valve is located at the second cover plate, along the length direction of the second cover plate, the distance between the center of the liquid injection port and the edge of the second explosion-proof valve is greater than 11 mm.
[0010] Preferably, along the length direction of the second cover plate, the notch is formed at the end of the protective patch away from the liquid injection port.
[0011] Preferably, the notch extends along the length direction of the second cover plate.
[0012] Preferably, along the width direction of the second cover plate, the width of the notch is 0.1 mm.
[0013] Preferably, the protective patch covers the top of the second explosion-proof valve.
[0014] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell described above.
[0015] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell module as described above.
[0016] According to the battery cell, battery cell module and battery pack of the utility model, a first explosion-proof valve and a second explosion-proof valve are provided at the ends of the shell of the battery cell in the length direction, that is, the long battery cell is arranged with two explosion-proof valve pressure relief structures, which can greatly shorten the exhaust path of the high-temperature and high-pressure gas inside the battery cell and increase the exhaust area, thereby improving the probability and timeliness of opening the explosion-proof valve when thermal runaway occurs in the battery cell, so as to avoid pressure imbalance inside the battery cell, and further prevent the pole group from moving due to pressure imbalance inside the battery cell and blocking the pressure relief port of the explosion-proof valve.
[0017] In addition, the second explosion-proof valve is also provided with a corresponding protective patch, which is formed with a notch for preventing the second explosion-proof valve from being contaminated, so as to ensure that the second explosion-proof valve is not contaminated by the electrolyte during the liquid injection process.
[0018] 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
[0019] 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.
[0020] Figure 1 is a partial schematic diagram of a battery cell according to an embodiment of the utility model;
[0021] Figure 2 is a schematic diagram of a second cover plate according to an embodiment of the utility model;
[0022] Figure 3 It is a schematic diagram of a protective patch according to an embodiment of the utility model.
[0023] Icon: 1-pole group; 20-main shell; 21-first cover plate; 22-second cover plate; 30-first explosion-proof valve; 31-second explosion-proof valve; 32-liquid injection port; 33-protective patch; 34-gap. DETAILED DESCRIPTION
[0024] 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.
[0025] 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.
[0026] 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.
[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] like Figures 1 to 3As shown, according to the first aspect of the utility model, a battery cell is provided, which includes a pole group 1 and a shell, and the pole group 1 is arranged inside the shell; in addition, the first end and the second end of the shell in the length direction are respectively provided with a first explosion-proof valve 30 and a second explosion-proof valve 31, that is, both ends of the long battery cell are arranged with an explosion-proof valve pressure relief structure, so that the exhaust path of the high-temperature and high-pressure gas inside the battery cell can be further shortened and the exhaust area can be increased, thereby improving the probability and timeliness of the explosion-proof valve opening when the battery cell has thermal runaway, so as to avoid pressure imbalance inside the battery cell. In the following, the specific structure of the above-mentioned parts of the battery cell according to the utility model will be described in detail.
[0034] In this embodiment, if Figure 1 As shown, the shell includes a first cover plate 21, a main shell 20 and a second cover plate 22 connected in sequence. The first explosion-proof valve 30 and the second explosion-proof valve 31 are respectively arranged at the first cover plate 21 and the second cover plate 22. In addition, the first cover plate 21 is also provided with a positive electrode column, and the second cover plate 22 is provided with a negative electrode column and a liquid injection port 32.
[0035] Furthermore, a protective patch 33 corresponding to the second explosion-proof valve 31 is further provided at the second end of the shell in the length direction, that is, the second cover plate 22 is provided with a protective patch 33 corresponding to the second explosion-proof valve 31, and in order to prevent the electrolyte from being pumped out and contaminating the explosion-proof valve during the process of injecting the electrolyte into the battery cell through the injection port 32, in this embodiment, Figure 2 As shown, along the length direction of the second cover plate 22, the distance (ie, S) between the center of the injection hole and the edge of the second explosion-proof valve 31 is set to be greater than 11 mm.
[0036] It should be noted that the shape and size of the protective patch 33 should correspond to those of the second explosion-proof valve 31 , that is, the protective patch 33 covers the top of the second explosion-proof valve 31 .
[0037] Furthermore, if Figures 2 to 3 As shown, the protective patch 33 is formed with a notch 34 for preventing the second explosion-proof valve 31 from being contaminated, so as to ensure that the second explosion-proof valve 31 will not be contaminated by the electrolyte during the liquid injection process. Specifically, along the length direction of the second cover plate 22, the end of the protective patch 33 away from the liquid injection port 32 is formed with the notch 34, and the notch 34 extends along the length direction of the second cover plate 22. Preferably, along the width direction of the second cover plate 22, the width of the notch 34 is 0.1 mm.
[0038] According to the battery cell of the utility model, the first explosion-proof valve 30 and the second explosion-proof valve 31 are respectively provided at both ends of the shell in the length direction of the battery cell, that is, explosion-proof valve pressure relief structures are arranged at both ends of the long battery cell, which can greatly shorten the exhaust path of the high-temperature and high-pressure gas inside the battery cell and increase the exhaust area, thereby increasing the probability and timeliness of opening the explosion-proof valve when the battery cell has thermal runaway, so as to avoid pressure imbalance inside the battery cell, and further prevent the pole group 1 from moving due to the pressure imbalance inside the battery cell and blocking the explosion-proof valve pressure relief port.
[0039] In addition, the second explosion-proof valve 31 is also provided with a corresponding protective patch 33, and the protective patch 33 is formed with a notch 34 for preventing the second explosion-proof valve 31 from being contaminated, so as to ensure that the second explosion-proof valve 31 is not contaminated by the electrolyte during the injection process.
[0040] According to a second aspect of the utility model, a battery cell module is provided, wherein the battery cell module comprises the battery cell as described above.
[0041] According to a third aspect of the present invention, a battery pack is provided, wherein the battery pack is provided with the battery cell module as described above.
[0042] 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, characterized in that: The battery cell comprises: Pole group; A shell, wherein the pole group is located inside the shell; a first explosion-proof valve, a second explosion-proof valve and a protective patch corresponding to the second explosion-proof valve are arranged at the end of the shell in the length direction, and the protective patch is formed with a notch for preventing the second explosion-proof valve from being contaminated.
2. The battery cell according to claim 1, characterized in that: The shell includes a first cover plate, a main shell and a second cover plate connected in sequence; the first explosion-proof valve and the second explosion-proof valve are respectively arranged at the first cover plate and the second cover plate; or, the first explosion-proof valve and the second explosion-proof valve are both located at the first cover plate or the second cover plate.
3. The battery cell according to claim 2, characterized in that: The second cover plate is also provided with a liquid injection port.
4. The battery cell according to claim 3, characterized in that: When the second explosion-proof valve is located at the second cover plate, along the length direction of the second cover plate, the distance between the center of the liquid injection port and the edge of the second explosion-proof valve is greater than 11 mm.
5. The battery cell according to claim 4, characterized in that: The notch is formed at the end of the protective patch away from the liquid injection port along the length direction of the second cover plate.
6. The battery cell according to claim 5, characterized in that: The notch extends along the length direction of the second cover plate.
7. The battery cell according to claim 6, characterized in that: Along the width direction of the second cover plate, the width of the notch is 0.1 mm.
8. The battery cell according to claim 1, characterized in that: The protective patch covers the top of the second explosion-proof valve.
9. A battery cell module, characterized in that: The battery cell module comprises the battery cell according to any one of claims 1 to 8.
10. A battery pack, characterized in that: The battery pack is provided with the battery cell module as claimed in claim 9.