Battery and battery pack

Abstract

This application provides a battery and a battery pack. The battery includes a casing, an insulator, a battery cell, and a current-conducting component. An injection hole is provided on the top wall of the casing. The insulator is disposed within the casing and has a receiving cavity. The battery cell is disposed within the receiving cavity. The current-conducting component is located between the top wall and the battery cell, forming a current-conducting channel. The orthographic projection of the current-conducting channel on the top wall covers the injection hole. At least one wetting hole is provided on the bottom surface of the insulator. Electrolyte flowing in from the injection hole flows at least partially along the current-conducting channel to the outside of the insulator and downwards to the bottom surface of the insulator, wetting the battery cell upwards through the wetting hole on the bottom surface of the insulator. The bottom surface area of ​​the insulator is S1, the total area of ​​the wetting holes is S2, and S2 / S1 is A. The width of the current-conducting channel is B, in mm, and the range of A / B satisfies 0.01 ≤ A / B ≤ 0.05.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery and a battery pack. Background Technology

[0002] In existing batteries, a Mylar membrane is placed between the cell and the casing. The Mylar membrane has excellent electrical insulation properties and is used to isolate the positive and negative electrode materials (such as electrode plates, tabs, and aluminum-plastic film) to prevent direct contact that could lead to short circuits. It also serves as an insulating layer between the casing and the cell, preventing direct contact between the metal casing and the cell. Within the battery, the Mylar membrane can buffer external impacts, prevent the aluminum-plastic film from being punctured by sharp electrodes, reduce the risk of leakage, and enhance overall stability by wrapping the core, preventing internal shaking.

[0003] To ensure that the battery cell is uniformly wetted by the electrolyte, a flow guide is usually installed above the Mylar membrane. The flow guide can guide the electrolyte to flow along the outer wall of the insulating component to the bottom of the casing under the action of gravity. The electrolyte can wet the battery cell under capillary action. As the electrolyte accumulates, it gradually wets the battery cell from bottom to top, avoiding the liquid sealing phenomenon that occurs when the electrolyte wets from the periphery to the center area. This ensures that all parts of the electrode assembly are uniformly wetted, improving the reliability of the battery cell.

[0004] However, in the existing technology, there are still problems such as low electrolyte wetting efficiency or some electrolyte residue between the Mylar membrane and the shell, which affects the insulation performance of the Mylar membrane between the cell and the shell. Utility Model Content

[0005] In view of this, the embodiments of this application aim to provide a battery and a battery pack to solve the problem in the prior art that the electrolyte wetting efficiency is low, or that some electrolyte remains between the Mylar membrane and the shell, affecting the insulation performance of the Mylar membrane between the cell and the shell.

[0006] A first aspect of this application provides a battery including a housing, the housing having a top wall and an injection hole thereon;

[0007] An insulating element disposed within the housing, the insulating element having a receiving cavity;

[0008] A battery cell, wherein the battery cell is disposed within the receiving cavity;

[0009] A flow guide is located between the top wall and the battery cell and is connected to the insulating component. The flow guide forms a flow channel, and the orthogonal projection of the flow channel on the top wall covers the injection hole.

[0010] The insulating component has at least one wetting hole on its bottom surface. The electrolyte flowing in from the injection hole is configured to flow at least partly along the flow channel to the outside of the insulating component and flow downward to the bottom surface of the insulating component, and then wetting the battery cell upward through the wetting hole on the bottom surface of the insulating component.

[0011] The bottom surface area of ​​the insulating component is S1, the total area of ​​the impregnation holes is S2, and S2 / S1 is A;

[0012] The width of the flow channel is B, in mm, and the range of A / B satisfies 0.01≤A / B≤0.05.

[0013] Another aspect of this application provides a battery pack including at least one battery.

[0014] In the battery manufacturing process of this application embodiment, the insulating component and the battery cell are first placed inside the casing according to a preset position. Then, the top wall of the casing is fixedly connected to the rest of the casing. Next, the electrolyte flows into the battery casing from the injection hole. Due to the obstruction of the flow guide, most of the electrolyte flowing in from the injection hole flows downward along the flow guide channel from the corresponding position of the flow guide channel to the outside of the insulating component and then downward to the bottom surface of the insulating component. It then wets the battery cell upward through the wetting holes on the bottom surface of the insulating component. Only a very small portion of the electrolyte wets the battery cell from above.

[0015] In the battery of this application embodiment, the bottom surface area of ​​the insulating member is S1, the total area of ​​the wetting holes is S2, and S2 / S1 is A; the width of the flow channel is B, in mm, and the range of A / B satisfies 0.01≤A / B≤0.05.

[0016] When the range of A / B satisfies 0.01≤A / B≤0.05, it can ensure that the total area ratio of the wetting holes is relatively high, thereby effectively improving the wetting efficiency of the electrolyte through the wetting holes to wet the battery cell and reducing the time required for the electrolyte wetting process. At the same time, while ensuring the wetting efficiency, it can reduce the coverage area of ​​the electrolyte flowing down from the corresponding position of the guide channel to the bottom surface of the insulator and reduce the area ratio of the wetting holes. This can reduce the amount of electrolyte remaining between the insulator and the shell, ensuring the insulation performance of the insulator between the battery cell and the shell, and also minimize the impact of the wetting holes on the insulation performance of the bottom surface of the insulator. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of the battery of this application is shown;

[0018] Figure 2 A side view of the battery structure of this application is shown;

[0019] Figure 3A schematic diagram of the unfolded structure of the insulating component of the battery of this application is shown;

[0020] Figure 4 A schematic diagram of the unfolded structure of another insulating component of the battery of this application is shown;

[0021] Figure 5 A schematic diagram of the unfolded structure of another insulating component of the battery of this application is shown;

[0022] Figure 6 A side view of another battery of this application is shown.

[0023] Attached image labels:

[0024] 10. Top wall; 11. Injection hole;

[0025] 20. Insulating component; 21. Impregnation hole;

[0026] 30. Flow guide component; 31. Flow guide channel; 32. Flow guide baffle;

[0027] 40. Base plate. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0030] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0031] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0032] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to limit the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0033] like Figures 1 to 3 As shown in the figure, this application embodiment provides a battery, which includes a casing, an insulating component 20, a battery cell, and a current-conducting component 30. The casing is provided with a top wall 10, and the top wall 10 is provided with a liquid injection hole 11;

[0034] An insulating component 20 is disposed within the housing and has a receiving cavity. The battery cell is disposed within the receiving cavity. A flow guide 30 forms a flow channel 31, and the orthogonal projection of the flow channel 31 on the top wall 10 covers the injection hole 11. It is understood that the insulating component 20 may have an opening communicating with the receiving cavity, with the opening facing the top wall 10. This opening may cover the entire top surface of the insulating component 20 or may only be provided on the top surface of the insulating component 20 at the position corresponding to the battery cell tab; no limitation is made here.

[0035] Specifically, the flow guide 30 can be composed of two oppositely arranged flow guide baffles 32, which are arranged in parallel between the top wall 10 of the outer shell and the top of the insulating member 20, and form the aforementioned flow guide channel 31; in another embodiment of this application, the flow guide 30 can also be other structures, as long as it forms the aforementioned flow guide channel 31.

[0036] The bottom surface of the insulating component 20 is provided with at least one wetting hole 21. The electrolyte flowing in from the injection hole 11 is configured to flow at least part of it along the flow channel 31 to the outside of the insulating component 20 and downward to the bottom surface of the insulating component 20, and then wetting the battery cell upward through the wetting hole 21 on the bottom surface of the insulating component 20.

[0037] In the battery manufacturing process of this application embodiment, the insulating component 20 and the battery cell are first placed into the casing according to a preset position. Then, the top wall 10 of the casing is fixedly connected to the rest of the casing. Then, the electrolyte flows into the battery casing from the injection hole 11. Due to the obstruction of the guide component 30, most of the electrolyte flowing in from the injection hole 11 flows downward along the guide channel 31 from the corresponding position of the guide channel 31 to the outside of the insulating component 20 and downward to the bottom surface of the insulating component 20. It then wets the battery cell upward through the wetting hole 21 on the bottom surface of the insulating component 20. Only a very small portion of the electrolyte wets the battery cell from above.

[0038] In the battery of this application embodiment, the bottom surface area of ​​the insulating member 20 is S1, in mm. 2 The total area of ​​the impregnation holes 21 is S2, in mm. 2 S2 / S1 is A; the width of the flow channel 31 is B, in mm, and the range of A / B satisfies 0.01≤A / B≤0.05. In various specific embodiments of this application, the value of A / B can be 0.01, 0.025, 0.04, or 0.05, etc.

[0039] When the range of A / B satisfies 0.01≤A / B≤0.05, it can ensure that the total area ratio of the wetting hole 21 is relatively high, thereby effectively improving the wetting efficiency of the electrolyte through the wetting hole 21 to wet the battery cell and reducing the time required for the electrolyte wetting process. At the same time, while ensuring the wetting efficiency, it can reduce the coverage area of ​​the electrolyte flowing down from the corresponding position of the guide channel 31 to the bottom surface of the insulating component 20 and reduce the area ratio of the wetting hole 21. This can reduce the amount of electrolyte remaining between the insulating component 20 and the shell, ensuring the insulation performance of the insulating component 20 between the battery cell and the shell, and also minimize the impact of the wetting hole 21 on the insulation performance of the bottom surface of the insulating component 20.

[0040] Specifically, in one embodiment of this application, the range of A satisfies 0.2 ≤ A ≤ 0.6. That is, when the range of A satisfies 0.2 ≤ A ≤ 0.6, since A is greater than or equal to 0.2, it can be ensured that the total area of ​​the wetting hole 21 occupies a relatively high proportion of the bottom surface of the insulating component 20, thereby moderately improving the wetting efficiency of the electrolyte through the wetting hole 21 to wet the battery cell upwards; while since A is less than or equal to 0.6, it ensures that the total area of ​​the wetting hole 21 does not occupy a relatively high proportion of the bottom surface of the insulating component 20, so as to reduce the impact of the wetting hole 21 on the insulation performance of the bottom surface of the insulating component 20. In various specific embodiments of this application, the value of A can be 0.2, 0.4, 0.5, or 0.6, etc.

[0041] In one embodiment of this application, the range of B satisfies 10 ≤ B ≤ 50, with units of mm. That is, when the width of the flow channel 31 satisfies 10 ≤ B ≤ 50, with units of mm, since B is greater than or equal to 10 mm, the flow channel 31 can be guaranteed to have a certain width. This ensures that most of the electrolyte flowing in from the injection hole 11 flows downwards along the flow channel 31 at a speed that meets requirements, thereby improving the electrolyte injection efficiency. Conversely, since B is less than or equal to 50 mm, by reducing the width of the flow channel 31, the coverage area of ​​the electrolyte flowing downwards from the corresponding position of the flow channel 31 to the bottom surface of the insulating component 20 can be reduced, thereby reducing the amount of electrolyte remaining between the insulating component 20 and the casing, ensuring the insulation performance of the insulating component 20 between the cell and the casing. In various specific embodiments of this application, the value of B can be 10, 24, 30, or 50, etc.

[0042] like Figure 3 As shown, in one embodiment of this application, a plurality of wetting holes 21 are provided on the bottom surface of the insulating member 20. By providing a plurality of wetting holes 21 on the bottom surface of the insulating member 20, when the electrolyte flows downward from the corresponding position of the flow channel 31 to the bottom surface of the insulating member 20 along the flow channel 31, some of the electrolyte can flow to the wetting holes 21 below the flow channel 31 to wet the battery cell upward, and some of the electrolyte can flow to the wetting holes 21 relatively far from the flow channel 31 to wet the battery cell upward, thereby ensuring that the battery cell is uniformly wetted by the electrolyte as much as possible.

[0043] like Figure 4As shown, in one embodiment of this application, the areas of each wetting hole 21 are the same, and the distribution density of the wetting holes 21 gradually decreases from the bottom surface of the insulating member 20 corresponding to the position of the guiding channel 31 towards the edge of the insulating member 20. Since the areas of each wetting hole 21 are the same, and the distribution density of the wetting holes 21 gradually decreases from the bottom surface of the insulating member 20 corresponding to the position of the guiding channel 31 towards the insulating member 20, most of the electrolyte can wet the battery cell from the wetting holes 21 below the guiding channel 31 upwards, and a small portion of the electrolyte can flow to the wetting holes 21 relatively far from the bottom surface of the guiding channel 31 to wet the battery cell upwards. This ensures that the battery cell can be wetted by the electrolyte everywhere, and while ensuring the wetting efficiency of the electrolyte, it can effectively reduce the total area of ​​the wetting holes 21, thereby minimizing the impact of the wetting holes 21 on the insulation performance of the bottom surface of the insulating member 20.

[0044] like Figure 5 As shown, in another embodiment of this application, each wetting hole 21 is uniformly distributed on the bottom surface of the insulating member 20, and the area of ​​each wetting hole 21 gradually decreases from the position corresponding to the flow channel 31 on the bottom surface of the insulating member 20 towards the edge of the insulating member 20. With each wetting hole 21 uniformly distributed on the bottom surface of the insulating member 20, and the area of ​​each wetting hole 21 gradually decreasing from the position corresponding to the flow channel 31 on the bottom surface of the insulating member 20 towards the edge of the insulating member 20, it is still possible to ensure that most of the electrolyte can wet the battery cell from the wetting holes 21 below the flow channel 31, and a small portion of the electrolyte can flow to the wetting holes 21 relatively far from the flow channel 31 to wet the battery cell. This ensures that all battery cells are wetted by the electrolyte, and while ensuring the wetting efficiency of the electrolyte, it can effectively reduce the total area of ​​the wetting holes 21, thereby minimizing the impact of the wetting holes 21 on the insulation performance of the bottom surface of the insulating member 20.

[0045] like Figure 3 As shown, in one embodiment of this application, the distance between each impregnation hole 21 and the edge of the adjacent insulating member 20 is greater than or equal to 2 mm. When the distance between each impregnation hole 21 and the edge of the adjacent insulating member 20 is greater than or equal to 2 mm, the structural strength of the edge region of the insulating member 20 can be effectively improved, and damage to the edge region of the insulating member 20 can be avoided.

[0046] like Figure 3 As shown, in one embodiment of this application, the shape of the impregnation hole 21 can be any one of a circle, rectangle, triangle, or polygon, and is not limited herein. It is understood that, compared to other shapes, the processing difficulty is lower when the shape of the impregnation hole 21 is a common shape such as a circle or rectangle.

[0047] like Figure 6As shown, in one embodiment of this application, the battery further includes a base plate 40, which is disposed below the insulating member 20. The base plate 40 has openings. The electrolyte flowing in from the injection hole 11 is configured to at least partially flow along the guide channel 31 to the outside of the insulating member 20 and downwards to the bottom surface of the base plate 40, then upwards to wet the battery cell via the openings in the base plate 40 and the wetting holes 21 on the bottom surface of the insulating member 20, and the value of A satisfies 0.4 ≤ A ≤ 0.6. In several specific embodiments of this application, where the battery further includes the base plate 40, the value of A can be 0.4, 0.45, 0.52, or 0.6, etc.

[0048] In the battery manufacturing process of this application embodiment, the insulating component 20, the battery cell, and the bottom support plate 40 are first placed into the casing according to a preset position. Then, the top wall 10 of the casing is fixedly connected to the rest of the casing. Then, the electrolyte flows into the battery casing from the injection hole 11. Due to the obstruction of the guide component 30, most of the electrolyte flowing in from the injection hole 11 flows downward along the guide channel 31 from the corresponding position of the guide channel 31 to the outside of the insulating component 20 and downward to the bottom surface of the bottom support plate 40. It then wets the battery cell upward through the opening of the bottom support plate 40 and the wetting hole 21 on the bottom surface of the insulating component 20.

[0049] Understandably, compared to batteries without a base plate 40, the electrolyte in batteries has a lower wetting efficiency because it needs to pass through the openings on the base plate 40. Therefore, when 0.4 ≤ A ≤ 0.6, since A is greater than or equal to 0.4, the wetting efficiency of the electrolyte through the wetting holes 21 to the battery cell can be moderately improved; while since A is less than or equal to 0.6, according to actual measurements, it can also be ensured that the total area of ​​the wetting holes 21 does not occupy a relatively high proportion of the bottom surface of the insulating component 20, so as to reduce the impact of the wetting holes 21 on the insulation performance of the bottom surface of the insulating component 20.

[0050] As mentioned above, the electrolyte flowing in from the injection hole 11 is configured to at least partially flow along the flow channel 31 to the outside of the insulator 20 and flow downward to the bottom surface of the insulator 20, and then wet the battery cell upward through the wetting hole 21 on the bottom surface of the insulator 20.

[0051] Therefore, in one embodiment of this application, the electrolyte flowing into the injection hole 11 is configured to flow entirely along the flow channel 31 to the outside of the insulating member 20 and downwards to the bottom surface of the insulating member 20, and then upwards to wet the battery cell through the wetting holes 21 on the bottom surface of the insulating member 20. Since the electrolyte flowing into the injection hole 11 flows entirely along the flow channel 31 to the outside of the insulating member 20 and downwards to the bottom surface of the insulating member 20, and then upwards to wet the battery cell through the wetting holes 21 on the bottom surface of the insulating member 20, it can effectively ensure that the battery cell is uniformly wetted by the electrolyte.

[0052] In another embodiment of this application, the gap between the flow guide and the injection hole in the battery height direction is less than 1 mm. Since the gap between the flow guide and the injection hole in the battery height direction is less than 1 mm, it can be ensured that most of the electrolyte can flow along the flow channel 31 to the outside of the insulating member 20 under the action of the flow guide and flow downward to the bottom surface of the insulating member 20, and then wet the battery cell upward through the wetting hole 21 on the bottom surface of the insulating member 20. Only a very small part of the electrolyte wets the battery cell from above.

[0053] This application also provides a battery module that includes at least one of the aforementioned batteries. Specifically, the number of the aforementioned batteries included in the battery module is not limited herein.

[0054] This application also provides a battery pack, which includes at least one of the aforementioned batteries. It is understood that in one embodiment of this application, the battery pack may include at least one of the aforementioned battery modules, and the aforementioned battery module includes at least one of the aforementioned batteries; in another embodiment of this application, the battery pack may be directly composed of at least one of the aforementioned batteries and other necessary devices.

[0055] This application also provides an electrical device that includes at least one of the aforementioned batteries. It is understood that this electrical device can be various types of electrical devices, such as electric vehicles, battery-powered appliances, and energy storage devices, and is not limited thereto. The electrical device may directly include the aforementioned battery, or it may include the aforementioned battery module or battery pack.

[0056] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

[0057] Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A battery, characterized by, include: The outer casing has a top wall (10) and an injection hole (11) on the top wall (10); An insulating element (20) is disposed within the housing and has a receiving cavity; A battery cell, wherein the battery cell is disposed within the receiving cavity; A flow guide (30) is located between the top wall (10) and the battery cell and is connected to the insulating member (20). The flow guide (30) forms a flow channel (31), and the orthographic projection of the flow channel (31) on the top wall (10) covers the injection hole (11). The insulating member (20) has at least one wetting hole (21) on its bottom surface. The electrolyte flowing in from the injection hole (11) is configured to flow at least partly along the flow channel (31) to the outside of the insulating member (20) and flow downward to the bottom surface of the insulating member (20), and then wet the battery cell upward through the wetting hole (21) on the bottom surface of the insulating member (20). The bottom surface area of ​​the insulating component (20) is S1, the total area of ​​the impregnation holes (21) is S2, and S2 / S1 is A; The width of the flow channel (31) is B, in mm, and the range of A / B satisfies 0.01≤A / B≤0.

05.

2. The battery of claim 1, wherein, The range of A satisfies 0.2≤A≤0.

6.

3. The battery of claim 1, wherein, The range of B satisfies 10≤B≤50, and the unit is mm.

4. The battery of claim 1, wherein, The bottom surface of the insulating component (20) is provided with a plurality of impregnation holes (21).

5. The battery of claim 4, wherein, Each of the impregnation holes (21) has the same area, and the distribution density of the impregnation holes (21) gradually decreases from the bottom surface of the insulating member (20) corresponding to the position of the flow channel (31) towards the edge of the insulating member (20).

6. The battery of claim 4, wherein, Each of the impregnation holes (21) is evenly distributed on the bottom surface of the insulating member (20), and the area of ​​each of the impregnation holes (21) gradually decreases from the bottom surface of the insulating member (20) corresponding to the flow channel (31) towards the edge of the insulating member (20).

7. The battery according to any one of claims 1 to 6, characterized in that, The distance between each of the impregnation holes (21) and the edge of the adjacent insulating element (20) is greater than or equal to 2 mm.

8. The battery according to any one of claims 1 to 6, characterized in that, The shape of the immersion hole (21) is circular, rectangular, triangular or polygonal.

9. The battery of claim 1, wherein, It also includes a base plate (40), which is disposed below the insulating member (20) and has openings. The electrolyte flowing in from the injection hole (11) is configured to at least partially flow along the flow channel (31) to the outside of the insulator (20) and flow downward to the bottom surface of the base plate (40), and then wet the battery cell upward through the opening of the base plate (40) and the wetting hole (21) on the bottom surface of the insulator (20). Furthermore, the range of A satisfies 0.4≤A≤0.

6.

10. The battery of claim 1, wherein, The electrolyte flowing into the injection hole (11) is configured to flow entirely along the flow channel (31) to the outside of the insulator (20) and flow downward to the bottom surface of the insulator (20), and then wet the battery cell upward through the wetting hole (21) on the bottom surface of the insulator (20).

11. The battery of claim 1, wherein, The gap between the flow guide and the injection hole in the height direction of the battery is less than 1 mm.

12. A battery pack, characterized by, It includes at least one battery as described in any one of claims 1 to 11.

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