Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and belongs to the technical field of batteries, the single battery comprises a top cover assembly, the top cover assembly comprises a top cover piece and an insulating part, the top cover piece is connected with a shell and covers a containing cavity, a liquid injection hole is formed in the top cover piece, and the liquid injection hole penetrates through the top cover piece in the height direction of the top cover piece; the insulating part is connected with one side, close to the electrode assembly, of the top cover plate, and the insulating part is provided with a liquid discharge hole communicated with the liquid injection hole; the partition plate is located in the containing cavity and connected with the insulating part, the partition plate comprises a liquid blocking area, the liquid blocking area and the insulating part are arranged at intervals in the height direction, the partition plate is provided with a plurality of flow guide holes, the flow guide holes are arranged around the liquid blocking area, and the orthographic projection of the hole wall of the liquid drainage hole on the partition plate in the height direction is located in the liquid blocking area. The liquid blocking area is arranged to prevent the fluid medium injected from the flow guide hole from directly washing the electrode assembly, the flow guide effect can be improved through the flow guide hole, it is ensured that the fluid medium is rapidly discharged into the containing cavity, and it is ensured that the fluid medium is normally immersed into the electrode assembly.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a single battery and a battery pack. BACKGROUND

[0002] With the increasing maturity of battery technology, single batteries are widely used in electric vehicles and energy storage fields, and the use performance and safety of single batteries are increasingly required. However, in the liquid injection process of the single battery, the fluid medium entering the battery cavity from the injection hole will directly high-pressure flush the electrode assembly, affecting the safety of the electrode assembly. UTILITY MODEL CONTENT

[0003] The utility model aims to solve the technical problem of how to high-pressure flush the electrode assembly in the battery liquid injection process to affect the safety of the electrode assembly.

[0004] Technical scheme: The utility model provides a single battery, comprising:

[0005] a shell having a containing cavity;

[0006] an electrode assembly located in the containing cavity;

[0007] a top cover assembly, the top cover assembly comprising a top cover sheet and an insulating piece, the top cover sheet being connected with the shell and covering and sealing the containing cavity, the top cover sheet having a height direction, the top cover sheet being provided with an injection hole, the injection hole penetrating through the top cover sheet along the height direction; the insulating piece being connected with one side of the top cover sheet close to the electrode assembly, the insulating piece having a drainage hole, the drainage hole being in communication with the injection hole;

[0008] a separator located in the containing cavity, the separator being connected with the insulating piece, the separator comprising a liquid blocking area, the liquid blocking area being arranged in the height direction and spaced apart from the insulating piece, the separator being provided with a plurality of flow guide holes, the plurality of flow guide holes being arranged around the liquid blocking area, and the hole wall of the drainage hole being located in the liquid blocking area in the orthographic projection of the height direction on the separator.

[0009] In some embodiments, the area of the plurality of flow guide holes is S mm 2 , and satisfies: 40 < S < 96.

[0010] In some embodiments, the insulating piece comprises a flow guide part, the flow guide part extending around the drainage hole and towards one side of the electrode assembly, and the flow guide part being arranged in the height direction and spaced apart from the separator.

[0011] In some embodiments, the top cover sheet has a length direction, the length direction and the height direction intersecting, and the insulating piece further comprises:

[0012] an insulating piece body connected with one side of the top cover sheet close to the electrode assembly, and the flow guide part being arranged on one side of the insulating piece body close to the electrode assembly;

[0013] The first protrusion is disposed on both sides of the insulating body along the length direction, and the first protrusion faces the electrode assembly and is connected to the electrode assembly.

[0014] The second boss is located on the side of the insulating body facing the electrode assembly. The partition is located between the first boss and the second boss and is connected to the first boss and the second boss respectively.

[0015] In some embodiments, the partition includes:

[0016] The separator body is provided with a liquid-blocking area and multiple flow guide holes around the liquid-blocking area. The separator body is spaced apart from the electrode assembly.

[0017] The first connecting part is located between the partition body and the first boss, and is connected to the partition body and the first boss respectively;

[0018] The second connecting part is located between the partition body and the second boss, and is connected to the partition body and the second boss respectively.

[0019] In some embodiments, the first boss has a first snap-fit ​​groove, and the first connecting portion passes through the first snap-fit ​​groove and snaps into the first boss.

[0020] The second protrusion has a second snap-fit ​​groove, and the second connecting part passes through the second snap-fit ​​groove and snaps into the second protrusion.

[0021] In some embodiments, the top cover 10 further has a width direction Z, which intersects the length direction Y and the height direction X in pairs; there are multiple first connecting portions 23, which are spaced apart along the width direction Z; there are multiple second connecting portions 24, which are spaced apart along the width direction Z.

[0022] In some embodiments, the top cover sheet also has a width direction, which intersects the length direction and the height direction in pairs; the partition also includes a flow guiding slope, which is disposed on both sides of the partition body along the width direction, the flow guiding slope is inclined relative to the width direction, and extends inclinedly from the connection between the flow guiding slope and the partition body toward the insulating member.

[0023] In some embodiments, the top cover sheet also has a width direction, which intersects the length direction and the height direction in pairs; the width of the partition body along the width direction Z is smaller than the width of the insulating member along the width direction Z.

[0024] In some embodiments, the insulating member further includes a flow guide portion disposed on the side of the insulating member body near the electrode assembly, the flow guide portion surrounding the drain hole and extending toward the liquid blocking area.

[0025] In some embodiments, the arrangement trajectory of the multiple guide holes is circular.

[0026] In some embodiments, the arrangement trajectory of the multiple guide holes is polygonal.

[0027] Accordingly, this application provides a battery pack including the aforementioned single battery cell.

[0028] Beneficial Effects: The single-cell battery of this application embodiment includes a top cover assembly, which includes a top cover sheet and an insulating member. The top cover sheet is connected to the housing and seals the receiving cavity. The top cover sheet has a height direction and is provided with a liquid injection hole that penetrates the top cover sheet along the height direction. The insulating member is connected to the side of the top cover sheet near the electrode assembly and has a drain hole that communicates with the liquid injection hole. A separator is located in the receiving cavity and is connected to the insulating member. The separator includes a liquid-blocking area, which is spaced apart from the insulating member along the height direction. The separator is provided with multiple flow guide holes, which are arranged around the liquid-blocking area. The orthogonal projection of the drain hole wall along the height direction onto the separator is located within the liquid-blocking area. By setting a liquid-blocking area to prevent the fluid medium injected from the flow guide hole from directly scouring the electrode assembly, and by setting flow guide holes around the periphery of the liquid-blocking plate, the flow guiding effect can be improved, ensuring that the fluid medium is quickly discharged into the receiving cavity and that the fluid medium is properly immersed in the electrode assembly.

[0029] The battery pack of this application embodiment includes the above-described single battery cell, and therefore the battery pack can have all the technical features and beneficial effects of the above-described single battery cell, which will not be repeated here. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a cross-sectional view of a single battery cell according to an embodiment of this application;

[0032] Figure 2 This is a cross-sectional view of a single cell according to another embodiment of this application;

[0033] Figure 3 This is a top view of a top cover assembly according to an embodiment of this application;

[0034] Figure 4 This is a bottom view of a top cover assembly according to an embodiment of this application;

[0035] Figure 5 This is a structural schematic diagram of the first type of top cover assembly and partition according to an embodiment of this application;

[0036] Figure 6This is a bottom view of the first type of partition according to an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the structure of the first type of partition according to an embodiment of this application;

[0038] Figure 8 This is a structural schematic diagram of the second type of top cover assembly and partition according to an embodiment of this application;

[0039] Figure 9 This is a bottom view of the second type of partition according to an embodiment of this application;

[0040] Figure 10 This is a schematic diagram of the structure of the second type of partition according to an embodiment of this application;

[0041] Figure 11 This is a structural schematic diagram of the third type of top cover assembly and partition according to an embodiment of this application;

[0042] Figure 12 This is a bottom view of the third type of partition according to an embodiment of this application;

[0043] Figure 13 This is a schematic diagram of the structure of the third type of partition according to an embodiment of this application;

[0044] Figure 14 This is a structural schematic diagram of the fourth type of top cover assembly and partition according to an embodiment of this application;

[0045] Figure 15 This is a bottom view of the fourth type of partition according to an embodiment of this application;

[0046] Figure 16 This is a schematic diagram of the structure of the fourth type of partition in this application embodiment.

[0047] Reference numerals: 1. Top cover assembly; 2. Partition; 10. Top cover piece; 11. Insulating component; 20. Liquid-blocking area; 21. Flow guide hole; 22. Partition body; 23. First connecting part; 24. Second connecting part; 25. Flow guide slope; 100. Injection hole; 110. Drain hole; 111. Flow guide part; 112. Insulating component body; 113. First boss; 114. Second boss; 1130. First snap-fit ​​groove; 1140. Second snap-fit ​​groove; X, height direction; Y, length direction; Z, width direction. Detailed Implementation

[0048] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0049] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0050] The applicant noted that during the electrolyte filling process, the fluid medium enters the individual cell through the filling port. When the fluid medium is injected, it directly impacts the electrode assembly under high pressure, which could affect the safety of the electrode assembly. Currently, a separator with flow channels is typically placed between the filling port and the electrode assembly to prevent the fluid medium from impacting the electrode assembly and to guide the flow of the fluid medium. However, due to space limitations of the separator and the influence of subsequent processes such as adhesive bonding, the flow guiding effect of the flow channels can be affected.

[0051] In view of this, this application provides a single-cell battery including a top cover assembly. The top cover assembly includes a top cover sheet and an insulating member. The top cover sheet is connected to the housing and seals the receiving cavity. The top cover sheet has a height direction and is provided with a liquid injection hole that penetrates the top cover sheet along the height direction. The insulating member is connected to the side of the top cover sheet near the electrode assembly and has a drain hole that communicates with the liquid injection hole. A separator is located in the receiving cavity and is connected to the insulating member. The separator includes a liquid-blocking area that is spaced apart from the insulating member along the height direction. The separator is provided with multiple flow guide holes that are arranged around the liquid-blocking area. The orthogonal projection of the drain hole wall along the height direction onto the separator is located within the liquid-blocking area. By setting the liquid-blocking area, the fluid medium injected from the flow guide hole is prevented from directly scouring the electrode assembly. The flow guide holes on the periphery of the liquid-blocking plate can improve the flow guiding effect, ensuring that the fluid medium is quickly discharged into the receiving cavity and that the fluid medium is properly immersed in the electrode assembly.

[0052] The single-cell battery and battery pack of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0053] Figure 1 This is a cross-sectional view of a single battery cell according to an embodiment of this application; Figure 2 This is a cross-sectional view of a single cell according to another embodiment of this application; Figure 3 This is a top view of a top cover assembly 1 according to an embodiment of this application;

[0054] Figure 4 This is a bottom view of a top cover assembly 1 according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the first type of top cover assembly 1 and partition 2 according to an embodiment of this application; Figure 6 This is a bottom view of the first type of partition 2 according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the first type of partition 2 according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the second type of top cover assembly 1 and partition 2 according to an embodiment of this application; Figure 9 This is a bottom view of the second type of partition 2 according to an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the second type of partition 2 according to an embodiment of this application; Figure 11 This is a schematic diagram of the structure of the third type of top cover assembly 1 and partition 2 according to an embodiment of this application; Figure 12 This is a bottom view of the third type of partition 2 in this application embodiment; Figure 13 This is a schematic diagram of the structure of the third type of partition 2 in this application embodiment; Figure 14 This is a schematic diagram of the structure of the fourth type of top cover assembly 1 and partition 2 according to an embodiment of this application;

[0055] Figure 15 This is a bottom view of the fourth type of partition 2 according to an embodiment of this application; Figure 16 This is a schematic diagram of the structure of the fourth type of partition 2 in this application embodiment.

[0056] refer to Figures 1 to 16This application provides a single-cell battery, including a housing, an electrode assembly, a top cover assembly 1, and a separator 2. The housing has a receiving cavity. The electrode assembly is located within the receiving cavity. The top cover assembly 1 includes a top cover sheet 10 and an insulating member 11. The top cover sheet 10 is connected to the housing and seals the receiving cavity. The top cover sheet 10 has a height direction X and is provided with an injection hole 100 that penetrates the top cover sheet 10 along the height direction X. The insulating member 11 is connected to the side of the top cover sheet 10 near the electrode assembly and has a drain hole 110 that communicates with the injection hole 100. The injection hole 100 and the drain hole 110 are used to connect the interior and exterior of the single-cell battery to allow a fluid medium to be injected into the receiving cavity inside the single-cell battery from the injection hole 100 and the drain hole 110. The fluid medium refers to a fluid that can flow; for a single-cell battery, the fluid medium can be an electrolyte.

[0057] The partition 2 is located within the receiving cavity and connected to the insulating component 11. The partition 2 includes a liquid-blocking area 20, which is spaced apart from the insulating component 11 along the height direction X. The partition 2 has multiple guide holes 21 arranged around the liquid-blocking area 20. The orthogonal projection of the drain hole 110 along the height direction X onto the partition 2 lies within the liquid-blocking area 20, which is located below the drained liquid. The liquid-blocking area 20 prevents the fluid medium injected into the receiving cavity from the guide holes 21 from directly scouring the electrode assembly. The fluid medium injected through the injection hole 100 and drain hole 110 scours the liquid-blocking area 20, thereby changing the flow direction of the fluid medium and reducing its scouring force. This prevents the electrode assembly from being scoured by the fluid medium, resulting in powder shedding, and thus avoids the risk of short circuits and safety issues during production or later use. A flow guide hole 21 is provided around the baffle plate so that the fluid medium whose flow direction has been changed can flow out through the flow guide hole 21. This setting can improve the flow guiding effect, ensure that the fluid medium is quickly discharged into the receiving cavity, and ensure that the fluid medium is properly immersed in the electrode assembly.

[0058] exist Figure 6 , Figure 9 , Figure 12 and Figure 15 In the embodiment shown, the area of ​​the plurality of guide holes 21 is S mm. 2 The condition is satisfied that 40 < S < 96. Specifically, the area S of the multiple guide holes 21 can be 41 mm². 2 45mm 2 50mm 2 55mm 2 60mm 2 65mm 2 70mm 2 75mm 2 80mm 2 85mm2 90mm 2 95mm 2 The range of values ​​between any one or any two values ​​in the range.

[0059] By limiting the area of ​​multiple guide holes 21, the risk of low liquid injection efficiency caused by the area of ​​multiple guide holes 21 being too small can be avoided, thereby avoiding the risk of liquid overflow during the liquid injection process; it can also avoid the risk of excessive flow rate of the fluid medium caused by the area of ​​multiple guide holes 21 being too large, which would cause the electrode assembly to be washed away by the fluid medium and cause powder and material to fall off, thereby avoiding the risk of short circuit failure of the electrode assembly and affecting the safety of the electrode assembly during production or later use.

[0060] In some embodiments, the top cover 10 has a length direction Y and a width direction Z, and the length direction Y, the width direction Z, and the height direction X intersect. Figure 2 In the illustrated embodiment, the length direction Y, width direction Z, and height direction X are arranged perpendicular to each other. The axis of the injection hole 100 and the guide hole 21 have a first dimension L1 mm in the direction perpendicular to the height direction X, satisfying: 5 ≤ L1 ≤ 7. Specifically, the first dimension L1 of the axis of the injection hole 100 and the guide hole 21 in the direction perpendicular to the height direction X can be any one value or a range between any two values ​​from 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, and 7 mm.

[0061] It is understandable that the orthogonal projections of the wall of the guide hole 21 and the wall of the injection hole 100 in the height direction X do not coincide. If the first dimension L1 of the axis of the injection hole 100 and the guide hole 21 in the direction perpendicular to the height direction X is too small, the buffer distance between the fluid medium and the guide hole 21 after it flows into the liquid-retaining zone 20 will be too short, and the flow velocity of the fluid medium entering the receiving cavity will be too fast, which may damage the electrode assembly and cause powder and material shedding from the electrode assembly. If the first dimension L1 of the axis of the injection hole 100 and the guide hole 21 in the direction perpendicular to the height direction X is too large, the fluid medium may not be able to be quickly discharged into the receiving cavity after it flows into the liquid-retaining zone 20, thereby affecting the normal immersion of the fluid medium into the electrode assembly and reducing the performance of the single cell. By defining the first dimension L1 of the axis of the injection hole 100 and the guide hole 21 in the direction perpendicular to the height direction X, the fluid medium injected through the injection hole 100 can have a certain buffer distance with the guide hole 21 after it is flushed by the liquid blocking area 20. This can effectively reduce the flushing force of the fluid medium, thereby protecting the electrode assembly and preventing the electrode assembly from being flushed by the fluid medium, which would cause powder or material to fall off. This would avoid the risk of short circuit failure and affecting the safety of the electrode assembly during production or later use.

[0062] exist Figure 6 , Figure 9 , Figure 12 and Figure 15 In the illustrated embodiment, similar to the above embodiment, there is a third dimension L3 mm between the two guide holes 21 arranged opposite each other in the direction perpendicular to the height direction X, satisfying: 10≤L3≤14. It can be understood that the third dimension L3 between the two guide holes 21 arranged opposite each other in the direction perpendicular to the height direction X is twice the first dimension L1 of the axis of the injection hole 100 and the guide hole 21 in the direction perpendicular to the height direction X. For example, the third dimension L3 between the two guide holes 21 arranged opposite each other in the direction perpendicular to the height direction X can be any one of 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm or a range between any two values.

[0063] By defining a third dimension L3 between two guide holes 21 arranged opposite each other in a direction perpendicular to the height direction X, the fluid medium injected through the injection hole 100 can have a certain buffer distance between itself and the guide holes 21 on the periphery of the baffle plate after it is flushed by the liquid-blocking area 20. This can effectively reduce the flushing force of the fluid medium, thereby protecting the electrode assembly and preventing the electrode assembly from being flushed by the fluid medium, which would cause powder or material to fall off. This would avoid the risk of short circuit failure and affecting the safety of the electrode assembly during production or later use.

[0064] exist Figure 2 In the illustrated embodiment, the outer diameter of the drain hole 110 is D mm, satisfying: 4 ≤ D ≤ 6. Specifically, the outer diameter D of the drain hole 110 can be any one of 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, and 6 mm, or a range between any two values.

[0065] By defining a third dimension L3 between two guide holes 21 arranged opposite each other in a direction perpendicular to the height direction X, and the outer diameter D of the drain hole 110, the fluid medium injected through the injection hole 100 can have a certain buffer distance between itself and the guide holes 21 on the periphery of the baffle plate after it is flushed by the liquid-blocking area 20. This can effectively reduce the flushing force of the fluid medium, thereby protecting the electrode assembly and preventing the electrode assembly from being flushed by the fluid medium, which would cause powder or material to fall off. This would avoid the risk of short circuit failure and affecting the safety of the electrode assembly during production or later use.

[0066] exist Figure 6 , Figure 9 , Figure 12 and Figure 15In the illustrated embodiment, there is a second dimension L2 mm between two adjacent guide holes 21, satisfying: 0.7 ≤ L2 ≤ 1. Specifically, the second dimension L2 between two adjacent guide holes 21 can be any one of 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or a range between any two values.

[0067] After flowing to the liquid-retaining zone 20, a portion of the fluid medium can be directly injected into the receiving cavity through the guide holes 21, while the remaining fluid medium flows to the area outside the guide holes 21 through the partition 2 between adjacent guide holes 21, thereby increasing the flow path of the fluid medium on the partition 2. By limiting the second dimension L2 between two adjacent guide holes 21, that is, the distance between adjacent guide holes 21, the flow rate of the fluid medium injected into the receiving cavity can be controlled to achieve a better guiding effect and fluid medium distribution, thereby protecting the electrode assembly and improving the safety of the individual battery. In addition, limiting the second dimension L2 between two adjacent guide holes 21 can also ensure the strength and rigidity of the partition 2, preventing the partition 2 from deforming, bending, or breaking during the flushing process of the fluid medium, which would affect the safety and reliability of the individual battery.

[0068] In some embodiments, the top cover 10 further has a width direction Z, which intersects the length direction Y and the height direction X in pairs; the width of the partition body 22 along the width direction Z is smaller than the width of the insulating member 11 along the width direction Z. Figure 2 In the illustrated embodiment, the insulating member 11 has a dimension M mm in the width direction Z, and the partition body 22 has a dimension N mm in the width direction Z, satisfying: 7 ≤ MN ≤ 14. It can be understood that when the dimension M of the insulating member 11 in the width direction Z and the dimension N of the partition body 22 in the width direction Z satisfy 7 ≤ MN ≤ 14, it indicates that the partition body 22 and the insulating member 11 are spaced apart on opposite sides along the width direction Z, and the sum of the distances between the two sides is between 7 mm and 14 mm. Specifically, the difference between the dimension M of the insulating member 11 in the width direction Z and the dimension N of the partition body 22 in the width direction Z can be any one of 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, and 14 mm, or a range between any two values.

[0069] With this configuration, the tabs of the electrode assembly can be folded and extended between the separator body 22 and the insulating member 11 and connected to the pole on the top cover assembly 1. By limiting the difference between the dimension M of the insulating member 11 in the width direction Z and the dimension N of the separator body 22 in the width direction Z, it can be ensured that the tabs have sufficient space while increasing the flow path of the fluid medium on the separator body 22, so as to effectively control the flow rate of the fluid medium injected into the receiving cavity and achieve a better flow guiding effect and fluid medium distribution.

[0070] exist Figure 2 and Figure 4 In the illustrated embodiment, the insulating member 11 includes an insulating member body 112, which is connected to the top cover plate 10 near the electrode assembly. The insulating member 11 includes a flow guide 111, which is disposed on the insulating member body 112 near the electrode assembly and extends around the drain hole 110 towards the liquid-blocking zone 20. The drain hole 110 is positioned opposite the liquid-blocking zone 20, and the orthogonal projection of the drain hole 110 along the height direction X onto the partition plate 2 lies within the liquid-blocking zone 20. This allows the fluid medium injected from the injection hole 100 and the drain hole 110 to completely flush the liquid-blocking zone 20, thereby changing the flow direction of the fluid medium and reducing its flushing force. This prevents the electrode assembly from being flushed by the fluid medium, causing powder shedding, and thus avoids the risk of short circuits and safety issues affecting the electrode assembly during production or later use. The flow guide 111 is spaced apart from the partition 2 to form a flow channel, facilitating the injection of fluid medium into the receiving cavity through the flow guide hole 21. The flow guide 111 guides the fluid medium injected through the injection port. Furthermore, the flow guide 111 protrudes from the insulating body 112 to prevent the injection port from being blocked by adhesive tape or electrode tabs, thus preventing the smooth injection of fluid medium.

[0071] exist Figure 1 In the illustrated embodiment, the insulating member 11 further includes a first boss 113 and a second boss 114. The first boss 113 is disposed on both sides of the insulating member body 112 along the length direction Y, facing the electrode assembly and connected to it. The second boss 114 is disposed on the side of the insulating member body 112 facing the electrode assembly. The partition 2 is disposed between the first boss 113 and the second boss 114, and is connected to both the first boss 113 and the second boss 114. The first boss 113 and the second boss 114 are used to abut against the electrode assembly to achieve positioning of the electrode assembly. The partition 2, disposed between the first boss 113 and the second boss 114, has a simple and stable structure, can effectively fix the partition 2, and is not prone to displacement or loosening.

[0072] In some embodiments, the partition 2 includes a partition body 22, a first connecting portion 23, and a second connecting portion 24. The partition body 22 is provided with a liquid-blocking area 20 and a plurality of guide holes 21 surrounding the liquid-blocking area 20, and the partition body 22 is spaced apart from the electrode assembly. The first connecting portion 23 is located between the partition body 22 and the first boss 113, and is connected to both the partition body 22 and the first boss 113. The second connecting portion 24 is located between the partition body 22 and the second boss 114, and is connected to both the partition body 22 and the second boss 114. The first connecting portion 23 and the first boss 113 can be connected by a snap-fit ​​connection. For example, the first boss 113 has a first snap-fit ​​groove 1130, and the first connecting portion 23 passes through the first snap-fit ​​groove 1130 and snaps into the first boss 113 to achieve a fixed connection with the first boss 113. The second connecting part 24 and the second boss 114 can be connected by a snap-fit ​​connection. For example, the second boss 114 has a second snap-fit ​​groove 1140, and the second connecting part 24 passes through the second snap-fit ​​groove 1140 and snaps into the second boss 114 to achieve a fixed connection with the second boss 114. This configuration is simple in structure and easy to install. It can prevent the partition 2 from shifting or loosening, ensure the correct relative position between the liquid-blocking area 20, the guide hole 21 and the drain hole 110, and avoid the electrode assembly from being washed away by the fluid medium, thus avoiding the risk of short circuit and damage to the electrode assembly during production or later use.

[0073] In some embodiments, the top cover 10 further has a width direction Z, which intersects the length direction Y and the height direction X in pairs; there are multiple first connecting portions 23, which are spaced apart along the width direction Z; there are multiple second connecting portions 24, which are spaced apart along the width direction Z. This arrangement can improve the connection stability between the partition 2 and the insulating member 11.

[0074] exist Figure 6 , Figure 9 , Figure 12 and Figure 15In the illustrated embodiment, the first connecting portion 23 has a dimension P mm in the width direction Z, and the second connecting portion 24 has a dimension Q mm in the width direction Z, satisfying: 1 ≤ |PQ| ≤ 2. It can be understood that by differentiating the dimension P of the first connecting portion 23 in the width direction Z and the dimension Q of the second connecting portion 24 in the width direction Z, such that the difference between the dimension P of the first connecting portion 23 in the width direction Z and the dimension Q of the second connecting portion 24 in the width direction Z is between 1 mm and 2 mm, a foolproof mechanism can be established to ensure that the separator 2 is correctly installed between the first boss 113 and the second boss 114. Furthermore, the battery also satisfies: 6 ≤ P ≤ 10, 6 ≤ Q ≤ 10. Specifically, the dimension P of the first connecting portion 23 in the width direction Z can be any one or a range between any two of the following values: 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, and 10 mm. The dimension Q of the second connecting portion 24 in the width direction Z can be any one or a range between any two of the following: mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, and 10 mm. This arrangement ensures the stability of the connection between the partition 2 and the insulating member 11, while also ensuring the strength of the first protrusion 113 and the second protrusion 114 of the insulating member 11, so that the first protrusion 113 and the second protrusion 114 can effectively limit the electrode assembly.

[0075] exist Figure 1 In the illustrated embodiment, the insulating member 11 has a dimension H1 mm in the height direction X, and the flow guiding part 111 and the partition 2 have a dimension H2 mm in the height direction X, satisfying: 3≤H1≤6, 0.5≤H2≤3. Specifically, the dimension H1 of the insulating member 11 in the height direction X can be any one of 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm or a range between any two values, and the dimension H2 of the flow guiding part 111 and the partition 2 in the height direction X can be any one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or a range between any two values.

[0076] In some embodiments, the dimension H1 of the insulating member 11 in the height direction X is the distance from the side of the guide portion 111 near the electrode assembly to the side of the insulating member body 112 near the top cover plate 10. It is understood that by limiting the dimension H1 of the insulating member 11 in the height direction X, it can be ensured that the fluid medium flows correctly to the liquid-blocking zone 20 under the guidance of the guide portion 111, avoiding problems with unstable flow direction of the fluid medium. Furthermore, by limiting the dimension H1 of the insulating member 11 in the height direction X, the flow velocity and impact force of the fluid medium in the guide portion 111 can be controlled, to a certain extent reducing the scouring force of the fluid medium on the liquid-blocking zone 20, and preventing the electrode assembly from being scoured by the fluid medium when injected into the receiving cavity, resulting in powder or material shedding. It can also ensure that the protrusion of the guide portion 111 is appropriate, effectively preventing clogging problems.

[0077] In some embodiments, if the dimension H2 of the flow guide 111 and the partition 2 in the height direction X is too small, the flow channel between the flow guide 111 and the partition 2 will be too small, affecting the injection speed and potentially posing a risk of overflow. If the dimension H2 of the flow guide 111 and the partition 2 in the height direction X is too large, the fluid medium flow rate will increase, leading to a risk of powder or material shedding due to the fluid medium washing over the electrode assembly when it is injected into the receiving cavity. This application provides sufficient space to accommodate the flow and washing of the fluid medium by limiting the dimension H2 of the flow guide 111 and the partition 2 in the height direction X. An appropriate spacing can reduce the washing force of the fluid medium on the electrode assembly, preventing powder or material shedding due to the fluid medium washing over the electrode assembly.

[0078] In some embodiments, the side of the partition 2 facing the electrode assembly is positioned higher than the side of the first boss 113 and the second boss 114 facing the electrode assembly. This prevents the partition 2 from contacting the electrode assembly and prevents the partition 2 from shifting or loosening.

[0079] In some embodiments, the partition 2 includes a partition body 22 and a flow guiding slope 25. The partition body 22 is provided with a liquid-blocking area 20 and a plurality of flow guiding holes 21 surrounding the liquid-blocking area 20. The flow guiding slope 25 is disposed on both sides of the partition body 22 along the width direction Z. The flow guiding slope 25 is inclined relative to the width direction Z and extends obliquely from the connection between the flow guiding slope 25 and the partition body 22 toward the insulating member 11. By configuring the partition in the embodiments of this application, the fluid medium has two flow paths. Part of the fluid medium, after being injected through the drain hole 110, flows along the liquid-blocking zone 20 to the guide hole 21 on the periphery of the liquid-blocking zone 20, and is injected into the receiving cavity through the guide hole 21. Another part of the fluid medium, after being injected through the drain hole 110, flows along the length Y direction of the partition 2 to the edge of the partition body 22, and after contacting the first connecting part 23 and the second connecting part 24, flows into the guide hole 21, and is injected into the receiving cavity through the guide hole 21. Yet another part of the fluid medium, after being injected through the drain hole 110, flows along the width Z direction of the partition 2 to the edge of the partition body 22 and the guide slope 25, then flows back to the guide hole 21 through the guide slope 25, and is injected into the receiving cavity through the guide hole 21. The inclined arrangement of the guide slope 25 relative to the partition body 22 guides the fluid medium to flow along a specific path. When part of the fluid medium is injected through the drain hole 110, the guide slope 25 guides it to the guide hole 21, and it is injected into the receiving cavity through the guide hole 21. This design helps control the flow direction of the fluid medium, ensuring it enters the containment cavity correctly.

[0080] In some embodiments, the arrangement trajectory of the plurality of guide holes 21 is polygonal. For example, in... Figures 5 to 7 In the embodiment shown, the guide hole 21 is rectangular in shape; Figures 8 to 10 In the embodiment shown, the guide hole 21 is L-shaped; in Figures 11 to 13 In the illustrated embodiment, the guide hole 21 is trapezoidal in shape. This application does not limit the shape of the guide hole 21.

[0081] In other embodiments, the plurality of guide holes 21 are arranged in a circular pattern. Exemplarily, in... Figures 14 to 16 In the illustrated embodiment, the guide hole 21 is annular in shape. This application does not limit the shape of the guide hole 21.

[0082] Accordingly, embodiments of this application provide a battery pack including the aforementioned individual battery cells. A battery pack can be a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. When there are multiple individual battery cells, they can be connected in series, parallel, or a combination thereof.

[0083] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0084] The present application provides a detailed description of a single battery cell and a battery pack, and uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single-cell battery, characterized in that, include: The shell has a receiving cavity; The electrode assembly is located within the receiving cavity; A top cover assembly includes a top cover sheet and an insulating member. The top cover sheet is connected to the housing and seals the receiving cavity. The top cover sheet has a height direction and is provided with a liquid injection hole that penetrates the top cover sheet along the height direction. The insulating member is connected to the side of the top cover sheet near the electrode assembly and is provided with a drain hole that communicates with the liquid injection hole. A partition is located within the receiving cavity and is connected to the insulating component. The partition has a liquid-blocking area and is provided with multiple flow guide holes arranged around the liquid-blocking area. The orthogonal projection of the wall of the drain hole along the height direction on the partition is located within the liquid-blocking area.

2. The single-cell battery according to claim 1, characterized in that, The top cover plate also has a length direction, which intersects with the height direction, and the insulating element includes: The insulating body is connected to the side of the top cover plate closest to the electrode assembly; The first protrusion is disposed on both sides of the insulating body along the length direction, and the first protrusion protrudes toward the electrode assembly and is connected to the electrode assembly; The second protrusion is disposed on the side of the insulating body facing the electrode assembly and is spaced apart from the first protrusion along the length direction. The partition is disposed between the first protrusion and the second protrusion and is connected to the first protrusion and the second protrusion respectively.

3. The single-cell battery according to claim 2, characterized in that, The partition includes: The partition body has the liquid-blocking area and is provided with a plurality of the flow guiding holes; The first connecting part is located between the partition body and the first boss, and is connected to the partition body and the first boss respectively; The second connecting part is located between the partition body and the second boss, and is connected to the partition body and the second boss respectively.

4. The single-cell battery according to claim 3, characterized in that, The first boss has a first snap-fit ​​groove, and the first connecting part passes through the first snap-fit ​​groove and snaps into the first boss. The second boss has a second snap-fit ​​groove, and the second connecting part passes through the second snap-fit ​​groove and snaps into the second boss.

5. The single-cell battery according to claim 3, characterized in that, The top cover also has a width direction, which intersects the length direction and the height direction in pairs; there are multiple first connecting parts, which are spaced apart along the width direction; there are multiple second connecting parts, which are spaced apart along the width direction.

6. The single-cell battery according to claim 3, characterized in that, The top cover plate also has a width direction, which intersects the length direction and the height direction in pairs; the partition also includes a flow guiding slope, which is disposed on both sides of the partition body along the width direction, the flow guiding slope is inclined relative to the width direction, and extends inclinedly towards the insulating member from the connection between the flow guiding slope and the partition body.

7. The single-cell battery according to claim 3, characterized in that, The top cover also has a width direction, which intersects the length direction and the height direction in pairs; the width of the partition body along the width direction is smaller than the width of the insulating member along the width direction.

8. The single-cell battery according to claim 2, characterized in that, The insulating component further includes a flow guide portion disposed on the side of the insulating component body near the electrode assembly, the flow guide portion surrounding the drain hole and extending toward the liquid blocking area.

9. The single-cell battery according to claim 1, characterized in that, The arrangement trajectory of the multiple guide holes is circular; or; The arrangement trajectory of the multiple guide holes is polygonal.

10. A battery pack, characterized in that, Includes a single cell battery as described in any one of claims 1 to 8.

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