Single battery and battery pack
By setting a guide channel and inner hole in the protective film of the single cell, the electrolyte is actively sucked and distributed by capillary phenomenon, the problem of low infiltration efficiency of the electrolyte is solved, and uniform infiltration and efficient flow of the electrolyte is achieved.
Patent Information
- Application Number
- CN202420416962.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-03-04
AI Technical Summary
In the prior art, the electrolyte is infiltrated in low efficiency, resulting in the electrolyte gathering at the bottom of the shell, the electrode sheet is in a single infiltration direction and the infiltration speed are slow, which affects the efficiency of the liquid injection infiltration process.
A single cell is designed, and its protective film includes a side film, which is provided with a guide channel, which actively sucks the electrolyte through capillary phenomena, and flows the electrolyte to the battery cell through the inner hole to achieve uniform infiltration of the electrolyte.
Through the utilization of capillary phenomena, the electrolyte can actively diffuse along the guiding channel, overcome gravity, improve the flow amplitude and flow range of the electrolyte infiltration, and greatly improve the efficiency of the electrolyte infiltration.
Smart Images
Figure CN222654316U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and in particular to a single cell and a battery pack. Background Art
[0002] The single cell mainly includes a shell, a top cover and a cell placed in the shell. The outside of the square cell needs to be covered with a protective film to prevent the square cell from being scratched when it is placed in the shell. The protective film plays a role of safety protection and insulation.
[0003] After the square cell is loaded into the shell, electrolyte needs to be injected into the shell and the electrolyte needs to be soaked around the side of the cell. The purpose is to soak the outermost electrode of the cell. The current protective film is mostly in plane contact with the outer side of the square cell in the height direction. When injecting electrolyte, the electrolyte tends to gather at the bottom of the shell due to gravity. The electrode is soaked in a single direction and the soaking speed is slow, which affects the efficiency of the injection and soaking process. Utility Model Content
[0004] The present application provides a single cell to solve the technical problem of low electrolyte infiltration efficiency existing in the current technology.
[0005] In a first aspect, the present application provides a single cell, wherein the single cell has a first direction, and the single cell comprises:
[0006] A housing having a receiving cavity;
[0007] A top cover, covering the shell along the first direction to close the accommodating cavity;
[0008] A battery cell, accommodated in the accommodation cavity;
[0009] A protective film, the protective film comprising a side film, the side film covers the peripheral side surface of the battery core parallel to the first direction, and the side film has an inner surface facing the battery core;
[0010] Wherein, the side membrane is provided with a guide channel, and the guide channel is configured to realize a capillary phenomenon and actively draw the electrolyte into the guide channel;
[0011] The side membrane is provided with inner holes, which are respectively connected to the inner surface and the guide channel, and the electrolyte in the guide channel flows to the battery core through the inner holes.
[0012] To implement the above technical solution, the electrolyte accumulated in some areas inside the packaging shell, for example, the electrolyte easily accumulated at the bottom of the packaging shell, can actively diffuse along the guide channel due to the existence of capillary phenomenon, and even overcome its own gravity to move along the first direction of the battery cell. In the process of the electrolyte moving along the guide channel, the electrolyte overflows from the inner hole and contacts the outer peripheral side of the battery cell, thereby reducing the accumulation of the electrolyte in the packaging shell, increasing the flow amplitude and flow range of the electrolyte infiltration, and greatly improving the efficiency of the electrolyte infiltration.
[0013] As one of the optional embodiments of the present application, the inner surface has other areas and a lower area in sequence along the first direction of the battery cell, and the guide channel has a first end and a second end, the first end is in the other area, and the second end is in the lower area.
[0014] To implement the above technical solution, in the actual infiltration process, the static process lasts the longest, and the electrolyte will usually accumulate in the lower area of the shell due to gravity. The setting of the guide channel can attract the electrolyte in the lower accumulation area to other areas where the electrolyte is relatively scarce, thereby further adapting to the most common conditions during the electrolyte injection process to improve the electrolyte infiltration efficiency.
[0015] As one of the optional embodiments of the present application, the inner surface has a second direction perpendicular to the first direction, and the first end and the second end have a distance difference in the second direction.
[0016] To implement the above technical solution, the guide channel may also be inclined.
[0017] As one of the optional embodiments of the present application, the total flow area of the holes in the other regions is greater than the total flow area of the holes in the lower region, and the inner diameter of the holes in the other regions is greater than the inner diameter of the holes in the upper region.
[0018] To implement the above technical solution, since the electrolyte is mainly accumulated in the space of the packaging shell located at the bottom of the battery cell, the electrolyte in the lower part of the battery cell is relatively sufficient, while the electrolyte in other areas of the battery cell is less. This setting facilitates the electrolyte to efficiently penetrate from the inner hole to other areas of the battery cell that are most difficult to wet, thereby improving the overall wetting efficiency of the battery cell.
[0019] As one of the optional implementation schemes of the present application, the diameter of the inner hole is D, 0mm<D≤0.05mm.
[0020] To implement the above technical solution, if the pore size of the inner hole is too large, the electrolyte will preferentially seep out from the inner hole near the electrolyte accumulation area instead of flowing along the guide channel, which will reduce the flow range of the electrolyte.
[0021] As one of the optional embodiments of the present application, the first end portion penetrates through the top surface of the side membrane and is connected to the outside of the side membrane, and the second end portion penetrates through the bottom surface of the side membrane and is connected to the outside of the side membrane.
[0022] To implement the above technical solution, the first end contacts the top injection hole of the packaging shell, and the second end contacts the electrolyte gathered at the bottom of the packaging shell, so that the electrolyte fully enters the guide channel to improve the wetting efficiency.
[0023] As one of the optional embodiments of the present application, the side membrane comprises:
[0024] An inner film covering a peripheral side surface of the battery cell parallel to the first direction;
[0025] An outer film, located on a side of the inner film away from the battery cell;
[0026] A spacer, wherein a plurality of the spacers are arranged at intervals, and the inner membrane and the outer membrane are flexibly connected by the spacers;
[0027] Wherein, two adjacent isolation members, the inner membrane and the outer membrane cooperate to enclose the guide channel.
[0028] To implement the above technical solution, a specific structure of a protective film is provided. The pole piece will expand during the process of charging and discharging of the battery cell. Therefore, when designing and manufacturing the battery cell, considering that the battery cell will not expand in the initial stage, the size of the battery cell will be designed to be smaller, so that there is a certain expansion space between the surrounding side of the battery cell and the inner wall of the packaging shell. This leads to the lack of compactness between the pole pieces, which is very unfavorable for the formation process. On the one hand, the double-layer design of the inner film and the outer film and the design of the separator in this scheme can make the force generated by the expansion of the battery cell act on the inner film and the separator, so that the separator is tilted, and then the spacing between the inner film and the outer film can be changed. That is, the thickness of the protective film can be adaptively changed, so that the design of the initial battery cell can have greater freedom and more reasonable choices. On the other hand, the design in this scheme makes the expansion of the battery cell produce pressure on the protective film, and the protective film will also give a reaction force to the surrounding side of the battery cell, so that the pole pieces of the battery cell are squeezed and fit tightly to each other.
[0029] As one of the optional embodiments of the present application, the side membrane includes an integrally formed membrane body, and the guide channel is opened in the membrane body.
[0030] The above technical solution is implemented to provide another specific structure of the protective film, in which the film body is integrally formed, thereby improving processing convenience and reducing economic costs.
[0031] As one of the optional embodiments of the present application, the side membrane comprises:
[0032] First film;
[0033] A second film is located on a side of the first film away from the battery cell;
[0034] A flexible guide tube, the outer side wall of which is fixedly connected to the first membrane and the second membrane respectively, and the guide channel is formed in the guide tube.
[0035] The above technical solution provides another specific structure of the protective film. An independent guide channel is formed inside the guide tube. The guide tube can also meet the deformation requirement by relying on its own deformation, so that the distance between the first film and the second film is variable.
[0036] As one of the optional embodiments of the present application, the protective film further comprises:
[0037] The bottom film, the side film is integrally connected with the bottom film at the bottom in the first direction, the bottom film is used to cover the bottom surface of the battery cell, and the bottom film is provided with a bottom hole, and the electrolyte contacts the bottom surface of the battery cell through the bottom hole.
[0038] On the other hand, the present application also provides a battery pack, which includes:
[0039] The above-mentioned single cell.
[0040] One of the above technical solutions has the following advantages or beneficial effects:
[0041] 1. The electrolyte accumulated in some areas of the packaging shell, for example, the electrolyte easily accumulated at the bottom of the packaging shell, can actively diffuse along the guide channel due to the existence of capillary phenomenon, and even overcome its own gravity and move along the first direction of the battery cell. In the process of the electrolyte moving along the guide channel, the electrolyte overflows from the inner hole and contacts the outer peripheral side of the battery cell, thereby reducing the accumulation of the electrolyte in the packaging shell, increasing the flow amplitude and flow range of the electrolyte infiltration, and greatly improving the efficiency of the electrolyte infiltration.
[0042] 2. The side membrane includes a double-layer design of an inner membrane, an outer membrane and a separator, so that the overall thickness of the side membrane can be variable, thereby enabling greater freedom and more reasonable choices in the design of the initial battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.
[0044] Figure 1 This is an overall structural diagram mainly used to show a single cell provided in Example 1 of the present application;
[0045] Figure 2 It is a three-dimensional diagram for showing the structure of the protective film provided in Example 1 of the present application;
[0046] Figure 3 It is a three-dimensional diagram of the enclosure perspective for showing the protective film structure provided in Example 1 of the present application;
[0047] Figure 4 is a top perspective view for showing the structure of the protective film provided in Example 1 of the present application;
[0048] Figure 5 This is a cross-sectional view provided in Example 1 of the present application and mainly used to show the double-layer structure design of the protective film;
[0049] Figure 6 This is a front view structure diagram provided in Example 1 of the present application, mainly used to show another double-layer structure of the protective film;
[0050] Figure 7 This is a front view structure diagram provided in Example 1 of the present application and mainly used to show another double-layer structure of the protective film;
[0051] Figure 8 is a cross-sectional view provided in Example 2 of the present application for showing the structure of the protective film;
[0052] Fig. 9 is a cross-sectional view of the protective film provided in Example 3 of the present application;
[0053] Fig.10 It is a perspective view used to show the trajectory of the guide channel;
[0054] Fig.11 It is a perspective view used to show another trajectory of the guide channel.
[0055] Figure numerals: 1. shell; 11. accommodating cavity; 2. top cover; 3. battery cell; 4. protective film; 41. side membrane; 411. inner membrane; 412. outer membrane; 413. separator; 4111. inner surface; 41111. inner hole; 41a. first membrane; 41b. second membrane; 41c. guide tube; 42. bottom membrane; 421. bottom hole; 5. guide channel; 51. first end; 52. second end; 61. other areas; 62. lower area. DETAILED DESCRIPTION
[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.
[0058] The following is combined with Figure 1-11 The present application is further described.
[0059] Example 1
[0060] Reference Figure 1-Figure 3 , is a single cell battery provided in the present application, the single cell battery has a first direction, that is, its own height direction. The single cell battery includes: a shell 1, the shell 1 has a receiving cavity 11. A top cover 2, the top cover 2 is covered on the shell 1 along the first direction to close the receiving cavity 11. A battery cell 3, the battery cell 3 is received in the receiving cavity 11. It also includes a protective film 4, the protective film 4 includes a bottom film 42 and a side film 41, wherein the bottom film 42 covers the bottom surface of the battery cell 3, and the side film 41 is provided with two pieces and is respectively connected integrally on both sides of the length direction of the bottom film 42. The length of the side film 41 is greater than the length of the bottom film 42. When the side film 41 is wrapped around the battery cell 3, it covers the circumferential side surface of the battery cell 3 parallel to the first direction, and the side film 41 has an inner surface 4111 facing the battery cell 3.
[0061] Reference Figure 2 and Figure 3 The side membrane 41 is provided with a guide channel 5, which is configured to realize a capillary phenomenon and actively draw the electrolyte into the guide channel 5. An inner hole 41111 is provided on the inner surface 4111 of the side membrane 41, and the inner hole 41111 is connected to the inner surface 4111 and the guide channel 5 respectively, and the electrolyte in the guide channel 5 flows to the battery cell 3 through the inner hole 41111.
[0062] The above setting enables the electrolyte accumulated in a certain area inside the shell 1, for example, the electrolyte easily accumulated at the bottom of the shell 1, to actively diffuse along the guide channel 5 due to the existence of capillary phenomenon, and even overcome its own gravity and move upward along the first direction of the battery cell 3. In the process of the electrolyte moving along the guide channel 5, the electrolyte overflows from the inner hole 41111 and contacts the outer peripheral side of the battery cell 3, thereby reducing the accumulation of the electrolyte in the shell 1, increasing the flow amplitude and flow range of the electrolyte infiltration, and greatly improving the efficiency of the electrolyte infiltration.
[0063] Combination Figure 3It should be noted that each side film 41 includes a large surface attachment sheet for covering the largest side surface of the battery cell 3 and a small surface attachment sheet for attaching to the smaller side surface parallel to the first direction. The two small surface attachment sheets are respectively connected to one large surface attachment sheet on both sides of the first direction. In this embodiment, the guide channel 5 is arranged only on the large surface attachment sheet, and in other optional embodiments, the guide channel 5 can also be arranged on both the large surface attachment sheet and the small surface attachment sheet. Alternatively, the guide channel 5 can be arranged in a local area of the side film 41.
[0064] Reference Figure 3 and Figure 4 , the inner surface 4111 has other regions 61 and a lower region 62 in sequence along the first direction of the battery cell 3, the guide channel 5 has a first end 51 and a second end 52, the first end 51 is in the other region 61, and the second end 52 is in the lower region 62. In this embodiment, the guide channel 5 extends vertically along the first direction. Among them, the lower region 62 refers to the region where the electrolyte gathers under the action of gravity when the shell 1 is placed, and the amount of electrolyte in the lower region 62 is relatively large, while the electrolyte in the other regions 61 tends to flow through the other regions 61 under the action of gravity and finally gather in the lower region 62, so the amount of electrolyte in the other regions 61 is less than that in the lower region 62.
[0065] The above setting enables the guide channel 5 to attract the electrolyte in the lower area 62 to other areas 61 where the electrolyte is relatively scarce, thereby further adapting to the most common situation during the electrolyte injection process to improve the electrolyte infiltration efficiency. More specifically, the second end 52 of the guide channel 5 is located below the liquid level of the liquid pool formed by the accumulation of electrolyte in the lower area 62, so as to more efficiently increase the electrolyte infiltration range.
[0066] Reference Figure 3 The first end 51 penetrates the top surface of the side film 41 and is connected to the outside of the side film 41, and the second end 52 penetrates the bottom surface of the side film 41 and is connected to the outside of the side film 41. The first end 51 contacts the top injection hole of the packaging shell 1, and the second end 52 contacts the electrolyte gathered at the bottom of the packaging shell 1, so that the electrolyte fully enters the guide channel 5 to improve the infiltration efficiency.
[0067] Reference Fig.10 and Fig.11 It should be noted that the guide channel 5 is not limited to extending along the first direction. In some optional embodiments, for example Fig.10 and Fig.11 In the embodiment, the inner surface 4111 has a second direction perpendicular to the first direction, and the first end 51 and the second end 52 of the guide channel 5 have a distance difference in the second direction.
[0068] The above setting makes it possible for the guide channel 5 to be inclined. It should be noted that the guide channel 5 can also be other irregular shapes, such as Fig.10 and Fig.11 The guide channels 5 may be in a wave shape, or other shapes such as a Z shape. The guide channels 5 may also be mutually cross-connected.
[0069] Reference Figure 4 , the number and arrangement of the inner holes 41111 are the same in the lower area 62 and the other areas 61. The total flow area of the inner holes 41111 in the other areas 61 is greater than the total flow area of the inner holes 41111 in the lower area 62, and the inner diameter of the inner holes 41111 in the other areas 61 is greater than the inner diameter of the inner holes 41111 in the upper area. The diameter of the inner holes 41111 is D, 0mm<D≤0.05mm.
[0070] In the above setting, since the electrolyte is mainly accumulated in the space of the packaging shell 1 located at the bottom of the battery cell 3, the electrolyte in the bottom of the battery cell 3 is relatively sufficient, while the electrolyte in other areas 61 of the battery cell 3 is less. This setting facilitates the electrolyte to efficiently penetrate from the inner hole 41111 to other areas 61 of the battery cell 3 that are most difficult to infiltrate, thereby improving the overall infiltration efficiency of the battery cell 3. However, if the pore size of the inner hole 41111 is too large, the electrolyte will preferentially seep out from the inner hole 41111 near the electrolyte accumulation area, rather than flowing along the guide channel 5, which will reduce the flow range of the electrolyte.
[0071] Reference Figure 2 and Figure 5 , the specific structure of the side membrane 41 is introduced below to disclose the specific composition of the guide channel 5.
[0072] The side membrane 41 includes: an inner membrane 411, covering the peripheral side of the battery cell 3 parallel to the first direction; an outer membrane 412, located on the side of the inner membrane 411 away from the battery cell 3; an isolating member 413, wherein a plurality of isolating members 413 are arranged at intervals, and the inner membrane 411 and the outer membrane 412 are flexibly connected by the isolating members 413; wherein two adjacent isolating members 413, the inner membrane 411 and the outer membrane 412 cooperate to enclose the guide channel 5. In this embodiment, the isolating member 413 is an isolating sheet, which is arranged perpendicular to the inner membrane 411 and the outer membrane 412. The angle between the isolating sheet and the inner membrane 411 is defined as angle α. In the initial state, angle α is equal to ninety degrees.
[0073] Since the separator 413 is flexibly connected to the inner film 411 and the outer film 412, the battery cell 3 expands during the process of being wetted and the battery cell 3 being charged and discharged. The expansion of the battery cell 3 will give a squeezing force to the inner film 411 and the separator 413, so that the separator 413 is tilted, that is, the angle α changes, and the distance between the inner film 411 and the outer film 412 can be changed. That is, the thickness of the protective film 4 can be adjusted.
[0074] In the initial state of this embodiment, the parameters are more specifically set as follows: the spacing between two adjacent spacers is L, 0.05≤L≤0.2mm, the thickness of the spacer is S, S≤0.05mm. The width of the spacer is N, which is slightly smaller than L, so that when the inner film 411 and the outer film 412 are about to be attached, the spacer 413 is in the spacing space formed between the two adjacent spacers 413, and the maximum deformation of the side film 41 has been achieved.
[0075] The reasons for the above settings are as follows: the electrode pieces of the battery cell 3 will expand during the process of charging and discharging. Therefore, when designing and manufacturing the battery cell 3, it will be considered that the battery cell 3 will not expand in the initial stage, and the size of the battery cell 3 will be designed to be smaller, so that there is a certain expansion space between the sides of the battery cell 3 and the inner wall of the packaging shell 1. This will result in the electrode pieces not fitting tightly enough, which is very unfavorable for the formation process. Therefore, this solution designs a side film 41 with a variable thickness, which can allow the battery cell 3 to have greater freedom and more reasonable choices in the initial design. In addition, the design in this solution makes the protective film 4 exert pressure on the protective film 4 when the battery cell 3 expands, and the protective film 4 also exerts a reaction force on the sides of the battery cell 3, so that the electrode pieces of the battery cell 3 are squeezed and fit tightly against each other.
[0076] Reference Figure 6 and Figure 7 It should be noted that in other optional embodiments, the isolating members 413 may not only form a rectangular space, but also other shapes such as a triangle, a trapezoid, etc. The specific size design parameters are based on the guide channel 5 being able to form a capillary phenomenon to play an active guiding role.
[0077] Example 2
[0078] Reference Figure 8 , which is different from the embodiment 1 in that the side membrane 41 comprises an integrally formed membrane body, and the guide channel 5 is opened in the membrane body. In this embodiment, the guide channel 5 is rectangular, and in other optional embodiments, it is not excluded that the cross section of the guide channel 5 is circular, trapezoidal, triangular or irregular.
[0079] As described above, this solution provides another specific structure of the protective film 4. Although it is difficult to achieve the advantage of the subsequent changeability of the side film 41, the film body is integrally formed, which improves the processing convenience and can effectively reduce the economic cost.
[0080] Example 3
[0081] Reference Fig. 9, which is different from the embodiment 1 in that the side film 41 includes a first film 41a, which is attached to the peripheral side of the battery cell 3 parallel to the first direction. And a second film 41b, which is located on the side of the first film 41a away from the battery cell 3. It also includes a flexible guide tube 41c, the outer side wall of which is fixedly connected to the first film 41a and the second film 41b, and a guide channel 5 is formed in the guide tube 41c.
[0082] The above provides another specific structure of the protective film 4. The guide channel 5 is independently formed inside the guide tube 41c. The guide tube 41c can also meet the deformation requirement by its own deformation, so that the distance between the first film 41a and the second film 41b is variable.
[0083] Example 4
[0084] The present application also provides a battery pack, which includes the above-mentioned single battery.
[0085] The above description is only a partial implementation method of the embodiments of the present application and does not constitute any form of limitation on the application. The protection scope of the embodiments of the present application is not limited thereto. Any simple modifications, equivalent changes and modifications that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.
Claims
1. A single cell battery, characterized in that: The single cell has a first direction, and the single cell includes: A housing (1) having a receiving cavity (11); A top cover (2) is covered on the housing (1) along the first direction to close the accommodating cavity (11); A battery cell (3) is accommodated in the accommodation cavity (11); A protective film (4), the protective film (4) comprising a side film (41), the side film (41) covering a peripheral side surface of the battery core (3) parallel to a first direction, the side film (41) having an inner surface (4111) facing the battery core (3); The side membrane (41) is provided with a guide channel (5), and the guide channel (5) is configured to realize a capillary phenomenon and actively draw electrolyte into the guide channel (5); The side membrane (41) is provided with an inner hole (41111), and the inner hole (41111) is respectively connected to the inner surface (4111) and the guide channel (5), and the electrolyte in the guide channel (5) flows to the battery core (3) through the inner hole (41111).
2. The single cell according to claim 1, characterized in that: The inner surface (4111) has other regions (61) and a lower region (62) in sequence along a first direction of the battery core (3); the guide channel (5) has a first end (51) and a second end (52); the first end (51) is located in the other region (61), and the second end (52) is located in the lower region (62).
3. The single cell according to claim 2, characterized in that: The inner surface (4111) has a second direction perpendicular to the first direction, and the first end (51) and the second end (52) have a distance difference in the second direction.
4. The single cell according to claim 2 or 3, characterized in that: The total flow area of the inner holes (41111) of the other regions (61) is greater than the total flow area of the inner holes (41111) of the lower region (62), and the inner diameter of the inner holes (41111) of the other regions (61) is greater than the inner diameter of the inner holes (41111) of the lower region (62).
5. The single cell according to any one of claims 1 to 3, characterized in that: The diameter of the inner hole (41111) is D, 0mm<D≤0.05mm.
6. The single cell according to claim 3, characterized in that: The first end portion (51) penetrates through the top surface of the side membrane (41) and is connected to the outside of the side membrane (41), and the second end portion (52) penetrates through the bottom surface of the side membrane (41) and is connected to the outside of the side membrane (41).
7. The single cell according to claim 1, characterized in that: The side membrane (41) comprises: An inner film (411) covering a peripheral side surface of the battery core (3) parallel to the first direction; An outer film (412) is located on a side of the inner film (411) facing away from the battery core (3); A spacer (413), wherein a plurality of the spacers (413) are arranged at intervals, and the inner membrane (411) and the outer membrane (412) are flexibly connected via the spacers (413); Wherein, the two adjacent isolation members (413), the inner membrane (411) and the outer membrane (412) cooperate to enclose the guide channel (5).
8. The single cell according to claim 1, characterized in that: The side membrane (41) comprises an integrally formed membrane body, and the guide channel (5) is opened in the membrane body.
9. The single cell according to claim 1, characterized in that: The side membrane (41) comprises: A first film (41a); A second film (41b) is located on a side of the first film (41a) facing away from the battery core (3); A flexible guide tube (41c), the outer side wall of which is fixedly connected to the first membrane (41a) and the second membrane (41b) respectively, and the guide channel (5) is formed in the guide tube (41c).
10. The single cell according to claim 1, characterized in that: The protective film (4) further comprises: A bottom film (42), wherein the side film (41) is integrally connected to the bottom film (42) at the bottom in the first direction, and the bottom film (42) is used to cover the bottom surface of the battery cell (3). A bottom hole (421) is formed through the bottom film (42), and the electrolyte contacts the bottom surface of the battery cell (3) through the bottom hole (421).
11. A battery pack, characterized in that: include: A single cell according to any one of claims 1 to 10.