A single cell and a battery pack

Abstract

This application provides a single-cell battery and a battery pack, belonging to the field of battery technology. The single-cell battery has a first orientation and includes a casing, an end cap, and a bottom support plate. The casing has a bottom wall with an explosion-proof valve. The end cap is connected to one end of the casing along the first orientation and is disposed opposite to the bottom wall along the first orientation; the end cap has an electrode post. The bottom support plate is disposed inside the casing and includes a limiting plate and an isolation plate connected along the first orientation. The isolation plate is connected to the end cap, and a venting space is formed between the limiting plate and the bottom wall. The limiting plate has a vent that extends through the first orientation, corresponding to the explosion-proof valve, and the venting space communicates with the vent. The single-cell battery provided in this application, by connecting the isolation plate and the end cap, and using the bottom support plate to provide support and reinforcement between the casing and the end cap, further improves the overall strength and stability of the single-cell battery and effectively prevents casing deformation.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] In the field of power batteries, ensuring the manufacturability and safety and reliability of batteries is of paramount importance to battery manufacturers. Among these, the reliability of the battery's valve opening and pressure relief is particularly critical.

[0003] The existing explosion-proof valve is located at the bottom of the battery. When the cell experiences thermal runaway, high-temperature and high-pressure gas is generated inside. The gas exerts the greatest expansion pressure on the top end cap area, causing the end cap to deform. This reduces the strength of the end cap weld area and may even cause the end cap to burst open, posing a safety risk. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0005] This application provides the following technical solution: a single-cell battery, having a first orientation, comprising: A housing having a bottom wall, wherein an explosion-proof valve is provided on the bottom wall; An end cap is connected to one end of the housing along the first direction and is disposed opposite to the bottom wall along the first direction; the end cap is provided with a pole post. A bottom support plate is disposed inside the housing. The bottom support plate includes a limiting plate and an isolation plate connected along the first direction. The isolation plate is connected to the end cover. An exhaust space is formed between the limiting plate and the bottom wall. The limiting plate is provided with an exhaust port that extends through the first direction. The exhaust port corresponds to the explosion-proof valve. The exhaust space is connected to the exhaust port.

[0006] In some embodiments, the single battery cell further includes an insulating element disposed within the housing, the insulating element being connected to the end cap on the side near the bottom support plate; The insulating component has a support platform on the side away from the end cover. The support platform protrudes along the first direction toward the bottom support plate. The end of the isolation plate away from the limiting plate is fixedly connected to the support platform.

[0007] In some embodiments, the single cell also has a second direction intersecting the first direction; The number of support platforms is multiple, and the multiple support platforms are arranged at intervals along the second direction; The isolation plate has a connecting part at one end away from the limiting plate. There are multiple connecting parts, which are arranged at intervals along the second direction and are connected to multiple support platforms.

[0008] In some embodiments, the single battery cell further includes a first electrode assembly and a second electrode assembly disposed within the housing; Both the first electrode assembly and the second electrode assembly are connected to the limiting plate. The isolation plate is located between the first electrode assembly and the second electrode assembly. The ends of the first electrode assembly and the second electrode assembly that are close to the end cap along the first direction are both in contact with the support platform.

[0009] In some embodiments, the single cell further includes an insulating film disposed within the housing and wrapped around the outside of the first electrode assembly and the second electrode assembly; Along the first direction, the insulating film has a through hole on the side adjacent to the limiting plate, the through hole is corresponding to the exhaust port, and the through hole communicates with the exhaust port.

[0010] In some embodiments, the single cell further has a third direction intersecting the first direction, and the separator has a notch extending through the third direction, the notch being located near the exhaust port and communicating with the exhaust port.

[0011] In some embodiments, the area of ​​the notch is larger than the area of ​​the exhaust port.

[0012] In some embodiments, the housing further has a sidewall connected to the bottom wall and the end cap, and the edge of the limiting plate and the sidewall have a gap that communicates with the exhaust space.

[0013] In some embodiments, the single cell further has a third direction intersecting the first direction, and along the third direction, the separator is disposed in the middle of the limiting plate, the limiting plate being symmetrical about the plane in which the separator is located.

[0014] Secondly, this application provides a battery pack including the aforementioned single battery cell.

[0015] The embodiments of this application have the following advantages: by connecting the separator plate and the end cap, the bottom support plate forms a supporting and reinforcing effect between the shell and the end cap, thereby further improving the overall strength and stability of the single cell and effectively preventing shell deformation; at the same time, the limiting plate and the bottom wall form an exhaust space, and the limiting plate is provided with an exhaust port corresponding to the explosion-proof valve, so that the high temperature and high pressure gas generated by the electrode assembly can enter the exhaust space through the exhaust port and open the explosion-proof valve, and allow the gas to be discharged from the explosion-proof valve.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 An exploded view of a single-cell battery provided by some embodiments of this application is shown; Figure 2 This application provides a schematic diagram of the internal structure of a single-cell battery from one perspective, based on some embodiments thereof. Figure 3 This invention provides a schematic diagram of the structure of a bottom support plate in a single-cell battery according to some embodiments of the present application. Figure 4 A cross-sectional view of a single cell provided by some embodiments of this application is shown.

[0019] Explanation of key component symbols: 100-Housing; 110-Exhaust space; 120-Side wall; 200-End cap; 300-Bottom wall; 210-Electrode post; 310-Explosion-proof valve; 400-Bottom support plate; 410-Limiting plate; 420-Isolation plate; 411-Exhaust port; 430-Connecting part; 220-Insulating component; 221-Support platform; 421-Notch; 500-First electrode assembly; 600-Second electrode assembly.

[0020] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the membrane plate is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figures 1 to 4 As shown, some embodiments of this application provide a single battery cell with a first direction X, which is mainly used to improve the stability of the connection between the end cap 200 and the housing 100, improve the overall compressive strength of the single battery cell, and improve the safety performance of the single battery cell.

[0027] The single cell includes a casing 100, an end cap 200, and a base plate 400.

[0028] Along the first direction X, one side of the housing 100 has a bottom wall 300, and the bottom wall 300 is equipped with an explosion-proof valve 310 to control the internal pressure of the individual battery, thereby preventing the individual battery from exploding. When excessive pressure is generated inside the individual battery, the explosion-proof valve 310 will open under the pressure, thereby releasing the high-pressure gas generated inside the individual battery into the external environment, thereby reducing the internal pressure of the individual battery and effectively preventing the risk of individual battery explosion.

[0029] End cap 200 is connected to one end of housing 100 along the first direction X, and end cap 200 and bottom wall 300 are disposed opposite each other along the first direction X. End cap 200 is provided with electrode post 210. It can be understood that bottom wall 300 and end cap 200 are respectively located on two opposite sides of single cell along the first direction X, that is, electrode post 210 and explosion-proof valve 310 are respectively disposed on two opposite sides of single cell along the first direction X, so as to form a thermoelectric separation structure on single cell, that is, explosion-proof valve 310 and electrode post 210 are not designed on the same side. By physically separating explosion-proof valve 310 and electrode, the safety, thermal management efficiency and stability of single cell are improved.

[0030] The connection method between the end cap 200 and the housing 100 includes at least one of the following: snap-fit, adhesive, bolt connection, or integral connection.

[0031] The bottom support plate 400 is disposed inside the housing 100. The bottom support plate 400 includes a limiting plate 410 and an isolation plate 420 connected along the first direction X. The connection method between the limiting plate 410 and the isolation plate 420 includes any one of bonding, snap-fitting, welding or integral molding.

[0032] In this embodiment, the limiting plate 410 and the isolation plate 420 are integrally formed to improve the overall strength and stability of the base plate 400.

[0033] It should be noted that the limiting plate 410 and the isolation plate 420 are parallel to the first direction X, and the limiting plate 410 and the isolation plate 420 are perpendicular to each other.

[0034] The separator 420 is connected to the end cap 200 on the side opposite to the limiting plate 410. The connection method between the separator 420 and the end cap 200 includes any one of bonding, snap-fitting, welding, or integral molding, which can be specifically set according to the actual situation. It can be understood that by connecting the separator 420 and the end cap 200, the bottom support plate 400 and the end cap 200 are connected. The bottom support plate 400 provides support and reinforcement between the housing 100 and the end cap 200, thereby further improving the overall strength and stability of the single battery cell and effectively preventing deformation of the housing 100.

[0035] In addition, an exhaust space 110 is formed between the limiting plate 410 and the bottom wall 300. The limiting plate 410 is provided with an exhaust port 411 that extends through the first direction X. The exhaust port 411 corresponds to the explosion-proof valve 310. The exhaust space 110 is connected to the exhaust port 411 so that the high temperature and high pressure gas generated by the electrode assembly can enter the exhaust space 110 through the exhaust port 411 and open the explosion-proof valve 310, and allow the gas to be discharged from the explosion-proof valve 310.

[0036] like Figure 2 and Figure 4 As shown, in some embodiments of this application, the single battery cell further includes an insulating member 220. The insulating member 220 is disposed inside the housing 100 and is connected to the end cap 200 on the side near the bottom support plate 400. The insulating member 220 separates the electrode assembly in the single battery cell from the end cap 200 to prevent short circuit between the terminal post 210 and the housing 100. At the same time, the insulating member 220 provides support and buffering in the single battery cell, and can absorb some stress to prevent the electrode assembly in the single battery cell from directly contacting the end cap 200 and causing deformation or damage.

[0037] The insulating component 220 has a support platform 221 on the side opposite to the end cap 200. The support platform 221 protrudes along the first direction X towards the base plate 400. The support platform 221 transforms the surface contact between the electrode assembly and the insulating component 220 into a point contact, thereby dispersing pressure, preventing localized stress concentration on the side of the electrode assembly facing the insulating component 220, ensuring uniform spacing between the electrode assembly and the end cap 200, and reducing deformation caused by compression. Furthermore, the support platform 221 provides a buffer space for the expansion of the electrode assembly in the single battery cell, effectively preventing the expansion force of the electrode assembly from being directly transmitted to the end cap 200, thus preventing deformation of the end cap 200.

[0038] In addition, the end of the isolation plate 420 facing away from the limiting plate 410 is fixedly connected to the support platform 221, thereby connecting the bottom support plate 400 and the insulating member 220. The outer wall of the bottom support plate 400, the side of the insulating member 220 facing the bottom support plate 400, and the inner wall of the housing 100 form a cavity, allowing the electrode assembly to be installed into the cavity. The bottom support plate 400, the insulating member 220, and the inner wall of the housing 100 provide limiting and fixing functions for the electrode assembly, thereby ensuring the stability of the electrode assembly in the cavity.

[0039] like Figure 2 and Figure 4 As shown, in some embodiments of this application, the single battery cell further has a second direction Y intersecting the first direction X. The first direction X and the second direction Y are perpendicular to each other.

[0040] The number of support platforms 221 is multiple, and the multiple support platforms 221 are arranged at intervals along the second direction Y. It can be understood that the number of support platforms 221 can be any number of two or more values, and can be specifically set according to the actual situation. In some embodiments, the multiple support platforms 221 are arranged at equal intervals along the second direction Y.

[0041] Additionally, the isolation plate 420 has a connecting portion 430 at one end opposite to the limiting plate 410. There are multiple connecting portions 430, which are arranged at intervals along the second direction Y, and each connecting portion 430 is connected to a plurality of support platforms 221. It is understood that the number of connecting portions 430 is equal to the number of support platforms 221, and one connecting portion 430 is connected to one support platform 221.

[0042] It is understandable that by increasing the number of connecting parts 430 and support platforms 221, the stability of the connection between the isolation plate 420 and the insulating member 220 is increased, thereby improving the stability of the connection between the insulating member 220 and the base plate 400.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the single battery cell further includes a first electrode assembly 500 and a second electrode assembly 600 disposed within the housing 100. It should be noted that the electrode assembly in any of the above embodiments includes the first electrode assembly 500 and the second electrode assembly 600.

[0044] The first electrode assembly 500 and the second electrode assembly 600 are both connected to the limiting plate 410 and are spaced apart along the third direction Z. The isolation plate 420 is located between the first electrode assembly 500 and the second electrode assembly 600 to separate the first electrode assembly 500 and the second electrode assembly 600. The ends of the first electrode assembly 500 and the second electrode assembly 600 near the end cap 200 along the first direction X abut against the support platform 221.

[0045] It is understandable that, along the first direction X, the insulating member 220 and the limiting plate 410 respectively provide limiting and fixing functions for the first electrode assembly 500 and the second electrode assembly 600, so as to improve the stability of the first electrode assembly 500 and the second electrode assembly 600 in the first direction X.

[0046] like Figure 1As shown, in some embodiments of this application, the single battery cell further includes an insulating film disposed inside the housing 100. The insulating film wraps around the outside of the first electrode assembly 500 and the second electrode assembly 600, so as to insulate and separate the first electrode assembly 500 and the second electrode assembly 600 from the housing 100 respectively, and prevent the first electrode assembly 500 and the second electrode assembly 600 from being connected to the housing 100 and forming a short circuit.

[0047] Along the first direction X, the insulating film has a through hole on the side adjacent to the limiting plate 410. The through hole is correspondingly provided with the exhaust port 411 and is connected to the exhaust port 411 so that the gas generated by the first electrode assembly 500 and the second electrode assembly 600 can enter the exhaust space 110 through the through hole and the exhaust port 411 during the operation of the single cell. This allows the gas generated by the first electrode assembly 500 and the second electrode assembly 600 to be discharged into the exhaust space 110, so as to provide a guiding effect for the gas through the through hole.

[0048] In addition, the diameter of the through hole can be set according to the specific circumstances.

[0049] like Figure 3 As shown, in some embodiments of this application, the single cell also has a third direction Z intersecting the first direction X. The separator 420 is provided with a notch 421 extending through the third direction Z. The notch 421 is located near the exhaust port 411 and is connected to the exhaust port 411. The notch 421 is provided so that the gas generated by the first electrode assembly 500 and the second electrode assembly 600 can enter the exhaust port 411 through the notch 421, so as to guide the gas through the notch 421, so that the gas can flow quickly into the exhaust port 411 through the notch 421 and enter the exhaust space 110 through the exhaust port 411.

[0050] like Figure 2 As shown, in some embodiments of this application, the area of ​​the notch 421 is larger than the area of ​​the exhaust port 411. It can be understood that the larger the notch 421 is, the greater the gas flow rate through the notch 421 per unit time. That is, by increasing the area of ​​the notch 421, the efficiency of the gas generated by the first electrode assembly 500 and the second electrode assembly 600 being discharged into the exhaust port 411 through the notch 421 is improved.

[0051] like Figure 4As shown, in some embodiments of this application, the housing 100 further has a sidewall 120 connected to the bottom wall 300 and the end cap 200. The edge of the limiting plate 410 and the sidewall 120 have a gap, which communicates with the exhaust space 110, so that the gas generated by the first electrode assembly 500 and the second electrode assembly 600 can be discharged through the gap between the edge of the limiting plate 410 and the sidewall 120, thereby allowing the discharged gas to enter the exhaust space 110, thereby further improving the exhaust efficiency.

[0052] It is understood that in some embodiments, along the second direction Y, there are gaps between the two opposite sides of the limiting plate 410 and the sidewall 120; in other embodiments, along the third direction Z, there are gaps between the two opposite sides of the limiting plate 410 and the sidewall 120; and in still other embodiments, along the direction perpendicular to the first direction X, there are gaps between the edge of the limiting plate 410 and the sidewall 120.

[0053] In other words, by controlling the area of ​​the gap between the limiting plate 410 and the side wall 120, the efficiency of the gas inside the housing 100 flowing from the side wall 120 and the limiting plate 410 into the exhaust space 110 is adjusted.

[0054] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the single cell also has a third direction Z intersecting the first direction X. Along the third direction Z, the isolation plate 420 is disposed in the middle of the limiting plate 410. The limiting plate 410 is symmetrical about the plane in which the isolation plate 420 is located, so as to ensure the uniformity and smoothness of the first electrode assembly 500 and the second electrode assembly 600 during the exhaust process, and to ensure the synchronicity and consistency of the exhaust of the first electrode assembly 500 and the second electrode assembly 600, so as to avoid the situation of uneven exhaust leading to bulging.

[0055] In some embodiments, the isolation plate 420 is provided with a plurality of first guide grooves on its two opposite sides. One end of the first guide groove is connected to the notch 421 so as to guide the gas generated inside the housing 100 through the first guide groove, thereby improving the efficiency of the gas entering the exhaust space 110 through the notch 421.

[0056] In other embodiments, along the first direction X, the limiting plate 410 is provided with a plurality of second guide grooves on the side facing the isolation plate 420. One end of the second guide groove is connected to the exhaust port 411 so as to guide the gas flowing through the surface of the limiting plate 410 through the second guide groove, so that the gas can flow quickly into the exhaust port 411 through the second guide groove, thereby improving the exhaust efficiency.

[0057] Some embodiments of this application provide a battery pack including the single battery cells described in any of the above embodiments.

[0058] It is understood that the battery pack has the beneficial effects of the individual cells in any of the above embodiments, which will not be elaborated here.

[0059] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A single-cell battery having a first orientation (X), characterized in that, include: The housing (100) has a bottom wall (300) and an explosion-proof valve (310) is provided on the bottom wall (300). An end cap (200) is connected to one end of the housing (100) along the first direction (X) and is disposed opposite to the bottom wall (300) along the first direction (X). The end cap (200) is provided with a pole post (210). A bottom support plate (400) is disposed inside the housing (100). The bottom support plate (400) includes a limiting plate (410) and an isolation plate (420) connected along the first direction (X). The isolation plate (420) is connected to the end cap (200). An exhaust space (110) is formed between the limiting plate (410) and the bottom wall (300). The limiting plate (410) is provided with an exhaust port (411) that extends along the first direction (X). The exhaust port (411) corresponds to the explosion-proof valve (310). The exhaust space (110) is connected to the exhaust port (411).

2. The single-cell battery according to claim 1, characterized in that, The single cell also includes an insulating component (220), which is disposed inside the housing (100) and is connected to the end cap (200) on the side near the bottom support plate (400). The insulating component (220) has a support platform (221) on the side away from the end cover (200). The support platform (221) protrudes along the first direction (X) towards the bottom support plate (400). The end of the isolation plate (420) away from the limiting plate (410) is fixedly connected to the support platform (221).

3. The single-cell battery according to claim 2, characterized in that, The single cell also has a second direction (Y) that intersects the first direction (X); The number of the support platforms (221) is multiple, and the multiple support platforms (221) are arranged at intervals along the second direction (Y); The isolation plate (420) has a connecting part (430) at one end away from the limiting plate (410). There are multiple connecting parts (430), which are arranged at intervals along the second direction (Y), and each of the multiple connecting parts (430) is connected to a multiple support platform (221).

4. The single-cell battery according to claim 2, characterized in that, The single cell also includes a first electrode assembly (500) and a second electrode assembly (600) disposed within the housing (100). The first electrode assembly (500) and the second electrode assembly (600) are both connected to the limiting plate (410), and the isolation plate (420) is located between the first electrode assembly (500) and the second electrode assembly (600). The ends of the first electrode assembly (500) and the second electrode assembly (600) along the first direction (X) near the end cap (200) are both in contact with the support platform (221).

5. The single-cell battery according to claim 4, characterized in that, The single cell also includes an insulating film disposed inside the housing (100) and wrapped around the outside of the first electrode assembly (500) and the second electrode assembly (600); Along the first direction (X), the insulating film has a through hole on the side adjacent to the limiting plate (410), the through hole is corresponding to the exhaust port (411), and the through hole communicates with the exhaust port (411).

6. The single-cell battery according to claim 1, characterized in that, The single cell also has a third direction (Z) intersecting the first direction (X), and the separator (420) has a notch (421) that runs through the third direction (Z). The notch (421) is located near the exhaust port (411) and is connected to the exhaust port (411).

7. The single-cell battery according to claim 6, characterized in that, The area of ​​the notch (421) is larger than the area of ​​the exhaust port (411).

8. The single-cell battery according to claim 1, characterized in that, The housing (100) also has a sidewall (120) connected to the bottom wall (300) and the end cap (200), and the edge of the limiting plate (410) and the sidewall (120) have a gap that communicates with the exhaust space (110).

9. The single-cell battery according to claim 1, characterized in that, The single cell also has a third direction (Z) intersecting the first direction (X) and the third direction (Z). Along the third direction (Z), the separator (420) is disposed in the middle of the limiting plate (410), and the limiting plate (410) is symmetrical about the plane in which the separator (420) is located.

10. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 9.

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