Battery and battery pack

Abstract

The present application relates to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises: an outer case having an accommodating cavity and an opening in communication with the accommodating cavity; an inner case provided in the accommodating cavity, wherein the inner case has an electrolyte injection cavity, the electrolyte injection cavity is in communication with the opening in a first direction, and electrolyte storage cavities are defined between the inner case and the outer case; an electrode assembly arranged in the electrolyte injection cavity; a cover assembly covering the opening, wherein a first gap is reserved between the cover assembly and the inner case in the first direction, the first gap makes the electrolyte injection cavity in communication with the electrolyte storage cavities, the cover assembly is provided with an electrolyte injection hole, and the electrolyte injection hole is in communication with the electrolyte injection cavity; and unidirectional communication members arranged on the inner case, wherein the unidirectional communication members are configured to allow unidirectional communication from the electrolyte storage cavities to the electrolyte injection cavity when the pressure of the electrolyte storage cavities exceeds a threshold. The present application is conducive to reducing the problem of wrinkles forming on electrode assemblies during charging and discharging of batteries, and prolonging the cycle service life of the batteries.

Description

A battery and battery pack

[0001] This application claims priority to Chinese Patent Application No. 202411844724.4, filed on December 13, 2024, entitled “A Battery and Battery Pack”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery and a battery pack. Background Technology

[0003] Lithium batteries continuously consume electrolyte and generate gas during use. As the electrolyte is consumed to a certain extent, it can easily cause inadequate wetting of the electrodes, leading to lithium plating on the electrodes and a significant reduction in capacity retention, thus affecting the cycle life of the battery. Summary of the Invention

[0004] Purpose of the invention: This application provides a battery to solve the above-mentioned technical problems; another purpose of this application is to provide a battery pack using the above-mentioned battery.

[0005] Technical solution: A battery according to an embodiment of this application, the battery having a first orientation, the battery comprising:

[0006] The outer shell has a receiving cavity and an opening communicating with the receiving cavity;

[0007] An inner shell is disposed in the receiving cavity, the inner shell has a liquid injection cavity, the liquid injection cavity communicates with the opening in the first direction, and a liquid storage cavity is formed between the inner shell and the outer shell;

[0008] An electrode assembly is disposed in the injection chamber;

[0009] A cover assembly is provided on the opening, the cover assembly and the inner shell have a first gap in the first direction, and the first gap connects the injection chamber and the storage chamber, the cover assembly has an injection hole, and the injection hole connects to the injection chamber;

[0010] A one-way flow element is disposed in the inner housing, and the one-way flow element is configured to enable the liquid storage chamber to unidirectionally flow into the injection chamber when the pressure of the liquid storage chamber exceeds a threshold.

[0011] In some embodiments, the inner housing has a first end and a second end disposed opposite to each other in the first direction, the first end facing the cover assembly, and the unidirectional guide being disposed at the second end.

[0012] In some embodiments, the battery further includes a flow guiding component disposed in the liquid storage cavity, the flow guiding component connecting the outer shell and the inner shell, the flow guiding component separating the liquid storage cavity and forming a flow guiding channel, the flow guiding channel having a third end and a fourth end disposed opposite to each other in the first direction, the third end facing the cover assembly, and the flow guiding channel being configured to prevent electrolyte from flowing from the fourth end to the third end.

[0013] In some embodiments, the flow guiding assembly includes multiple sets of flow guiding groups, each set of flow guiding groups having multiple flow guiding parts, the multiple sets of flow guiding groups being spaced apart in the liquid storage cavity along a first direction, the multiple flow guiding parts of each set of flow guiding groups being arranged along directions intersecting the first direction, and a second gap being between adjacent flow guiding parts;

[0014] In two adjacent groups of guide sections, at least a portion of the guide section in one group is directly opposite the second gap between two adjacent guide sections in the other group, and in the direction intersecting the first direction, the width of the guide section directly opposite the second gap is a, and the width of the second gap is b, satisfying a≥b.

[0015] In some embodiments, the flow guide has a fifth end and a sixth end disposed opposite to each other in a first direction, the fifth end facing the cover assembly, and the flow guide has a flow guide surface that slopes from the fifth end toward the sixth end.

[0016] In some embodiments, the flow guide includes a first sub-part, a second sub-part, and a third sub-part connected to each other, the first sub-part being disposed on the side of the second sub-part and the third sub-part facing the cover assembly, the first sub-part extending along the first direction, and a second gap being formed between the second sub-part of one of two adjacent flow guides and the third sub-part of the other in each group of flow guides;

[0017] In the first direction, at least a portion of the first sub-part is directly opposite the second gap, and the second sub-part and the third sub-part extend obliquely from the end connected to the first sub-part toward the fourth end, and the extension direction of the second sub-part and the extension direction of the third sub-part form an angle.

[0018] The first sub-part has a seventh end that is away from the connected second sub-part, the second sub-part has an eighth end that is away from the connected first sub-part, and the third sub-part has a ninth end that is away from the connected first sub-part. In the direction intersecting the first direction, the width of the seventh end is c, which satisfies b≥c, and the distance between the eighth end and the ninth end is d, which satisfies b<d.

[0019] In some embodiments, the flow guiding assembly further includes a first enclosure and a second enclosure, the flow guiding portion is connected between the first enclosure and the second enclosure, the first enclosure, the second enclosure and the flow guiding portion define the flow guiding channel, the first enclosure, the second enclosure and the flow guiding portion are disposed in the liquid storage cavity, and the first enclosure is connected to the outer shell and the second enclosure is connected to the inner shell;

[0020] The second enclosure has a through-hole facing the unidirectional guide member, and the through-hole is connected to the flow channel.

[0021] In some embodiments, the liquid storage chambers are provided in multiple ways, and the multiple liquid storage chambers are distributed around the outer periphery of the inner shell, and at least some of the liquid storage chambers are interconnected.

[0022] In some embodiments, the battery further has a second direction and a third direction, wherein the first direction, the second direction, and the third direction intersect each other;

[0023] The inner housing has a first side and a second side disposed opposite to each other in the second direction, and the inner housing has a third side and a fourth side disposed opposite to each other in the third direction;

[0024] The liquid storage chamber is located on one of the first side, the second side, the third side, and the fourth side.

[0025] In some embodiments, the battery further has a second direction and a third direction, wherein the first direction, the second direction, and the third direction intersect each other;

[0026] The inner housing has a first side and a second side disposed opposite to each other in the second direction, and the inner housing has a third side and a fourth side disposed opposite to each other in the third direction;

[0027] The liquid storage chamber is provided in multiple ways, and the multiple liquid storage chambers are distributed at intervals on at least one of the first side, the second side, the third side and the fourth side. The inner shell is provided with the one-way guide for each liquid storage chamber.

[0028] In some embodiments, the inner housing has a first end facing the cover assembly in the first direction;

[0029] The electrode assembly includes a battery cell body and a tab connected to the battery cell body. The tab is located at one end of the battery cell body facing the cover assembly. In the first direction, the end of the battery cell body facing the cover assembly is lower than or flush with the first end.

[0030] Accordingly, the battery pack described in this application includes the battery described above.

[0031] Beneficial Effects: A battery according to an embodiment of this application includes an outer shell, an inner shell, an electrode assembly, a cover assembly, and a one-way conductive element. The outer shell has a receiving cavity and an opening communicating with the receiving cavity. The inner shell is disposed in the receiving cavity and has a liquid injection cavity communicating with the opening in a first direction. A liquid storage cavity is formed between the inner shell and the outer shell. The electrode assembly is disposed in the liquid injection cavity, and the cover assembly covers the opening. The cover assembly and the inner shell have a first gap in the first direction, which communicates the liquid injection cavity and the liquid storage cavity. The cover assembly has a liquid injection hole communicating with the liquid injection cavity. The one-way conductive element is disposed in the inner shell and is configured to allow the liquid storage cavity to communicate unidirectionally with the liquid injection cavity when the pressure in the liquid storage cavity exceeds a threshold. Electrolyte is injected into the injection chamber through the injection hole. Part of the electrolyte flows into the storage chamber through the first gap and is stored. During battery use, the electrolyte in the injection chamber is consumed, generating gas. This gas enters the storage chamber through the first gap. As the gas increases until it reaches the conduction pressure threshold of the unidirectional conductor, the stored electrolyte in the storage chamber is forced into the injection chamber by the gas, thus replenishing the injection chamber with electrolyte and wetting the electrode assembly, which helps extend the battery's cycle life. Furthermore, the inner shell provides restraint to the electrode assembly, helping to reduce wrinkles generated during charging and discharging, and improving battery stability. Attached Figure Description

[0032] 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.

[0033] Figure 1 is a schematic diagram of the structure of the battery according to an embodiment of this application;

[0034] Figure 2 is a schematic diagram of the exploded structure of the battery according to an embodiment of this application;

[0035] Figure 3 is a schematic diagram of the battery cover assembly viewed from the front along the first direction according to an embodiment of this application;

[0036] Figure 4 is a cross-sectional view along line AA in Figure 3;

[0037] Figure 5 is a cross-sectional view along line BB in Figure 3;

[0038] Figure 6 is a schematic diagram of the structure of the receiving cavity, the injection cavity, and the storage cavity in an embodiment of this application;

[0039] Figure 7 is a cross-sectional view along line CC in Figure 6;

[0040] Figure 8 is a schematic diagram of the flow guiding component according to an embodiment of this application;

[0041] Figure 9 is a schematic diagram of the structure of the split-type flow guide component according to an embodiment of this application;

[0042] Figure 10 is a schematic diagram of the structure of a flow guide section according to an embodiment of this application;

[0043] Figure 11 is a schematic diagram of the flow guide section according to another embodiment of this application;

[0044] Figure 12 is a schematic diagram of the flow guide section according to another embodiment of this application;

[0045] Figure 13 is a cross-sectional view of the inner casing above the battery cell body according to another embodiment of this application;

[0046] Reference numerals: 1. Outer shell; 10. Receiving cavity; 11. Opening; 12. Liquid storage cavity; 13. First gap; 2. Inner shell; 20. Liquid injection cavity; 21. First end; 22. Second end; 23. First side; 24. Second side; 25. Third side; 26. Fourth side; 3. Electrode assembly; 30. Cell body; 31. Tab; 4. Cover assembly; 40. Cover plate; 41. Liquid injection hole; 42. Insulating component; 43. Terminal post; 5. One-way conduction component; 6. Flow guiding assembly; 60 600. Flow guiding channel; 601. Third end; 601. Fourth end; 61. Flow guiding part; 610. Fifth end; 611. Sixth end; 612. First sub-part; 6120. Seventh end; 613. Second sub-part; 6130. Eighth end; 614. Third sub-part; 6140. Ninth end; 615. Flow guiding surface; 62. Second gap; 63. First enclosure; 64. Second enclosure; 640. Connecting port; 7. Explosion-proof valve; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] Currently, lithium batteries continuously consume electrolyte and generate gas during use. As the electrolyte is consumed to a certain extent, it can easily lead to inadequate wetting of the electrodes, resulting in lithium plating on the electrodes and a significant reduction in capacity retention, thus affecting the cycle life of the battery.

[0050] In addition, during the charging and discharging process, the electrodes inside the battery will expand. Some power batteries do not restrain this expansion, which can easily cause uneven stress release on the electrodes, leading to wrinkles on the electrodes and affecting the stability of the battery.

[0051] In view of the above, referring to Figures 1 to 13, embodiments of this application provide a battery that aims to solve at least one of the above-mentioned technical problems.

[0052] It should be noted that the following embodiments introduce a first direction X, a second direction Y, and a third direction Z that intersect each other. Referring to Figure 1, the first direction X is approximately parallel to the height direction of the battery as a whole, the second direction Y is approximately parallel to the thickness direction of the battery as a whole, and the third direction Z is approximately parallel to the length direction of the battery as a whole.

[0053] Referring to Figures 1 to 7, a battery includes an outer shell 1, an inner shell 2, an electrode assembly 3, a cover assembly 4, a one-way conduction component 5, and an explosion-proof valve 7.

[0054] The outer shell 1 has a receiving cavity 10 and an opening 11 communicating with the receiving cavity 10. The inner shell 2 is disposed in the receiving cavity 10 and has a liquid injection cavity 20 communicating with the opening 11 in the first direction X. A liquid storage cavity 12 is formed between the inner shell 2 and the outer shell 1. The electrode assembly 3 is disposed in the liquid injection cavity 20, and the cover assembly 4 is disposed on the opening 11. The cover assembly 4 and the inner shell 2 have a first gap 13 in the first direction X, which communicates the liquid injection cavity 20 and the liquid storage cavity 12. The cover assembly 4 has a liquid injection hole 41 communicating with the liquid injection cavity 20. A one-way guiding member 5 is disposed in the inner shell 2 and is configured to allow the liquid storage cavity 12 to unidirectionally communicate with the liquid injection cavity 20 when the pressure in the liquid storage cavity 12 exceeds a threshold.

[0055] Electrolyte is injected into the injection chamber 20 through the injection hole 41, and some of the electrolyte flows into the storage chamber 12 through the first gap 13 and is stored. During battery use, the electrolyte in the injection chamber 20 is consumed and gas is generated. The gas enters the storage chamber 12 through the first gap 13. As the amount of gas generated increases until it reaches the conduction pressure threshold of the one-way conductor 5, the electrolyte stored in the storage chamber 12 can pass through the one-way conductor 5 and enter the injection chamber 20 by the pressure of the gas, thereby replenishing the injection chamber 20 with electrolyte and wetting the electrode assembly 3, which helps to extend the battery's cycle life. During battery charging and discharging, the inner shell 2 simultaneously restrains the electrode assembly 3, and the storage chamber 12 can also serve as a buffer space for the electrode assembly 3 to expand, which helps to reduce the wrinkling problem generated by the electrode assembly 3 during charging and discharging and improves the stability of the battery.

[0056] In some embodiments, referring to Figures 2, 4, and 5, the cover assembly 4 includes a cover plate 40, an insulator 42, and an electrode post 43. The cover plate 40 covers the opening 11, and an injection hole 41 is formed in the cover plate 40. The insulator 42 is disposed on the side of the cover plate 40 facing the electrode assembly 3 to insulate the cover plate 40 and the electrode assembly 3. The electrode post 43 passes through the cover plate 40 and is used for electrical connection to the electrode assembly 3. Referring to Figure 4, a first gap 13 is formed between the cover plate 40 and the electrode assembly 3.

[0057] In some embodiments, referring to Figures 4 and 5, the inner housing 2 has a first end 21 and a second end 22 disposed opposite to each other in the first direction X, with the first end 21 facing the cover plate 40. The electrode assembly 3 includes a cell body 30 and a tab 31 connected to the cell body 30. The tab 31 is located at the end of the cell body 30 facing the cover plate 40 to facilitate electrical connection to the electrode post 43. In the first direction X, the end of the cell body 30 facing the cover plate 40 does not protrude beyond the first end 21. In this embodiment, the end of the cell body 30 facing the cover plate 40 is flush with the first end 21. In other embodiments, the end of the cell body 30 facing the cover plate 40 may be lower than the first end 21. At the same time, the height of the outer housing 1 in the first direction X is greater than the height of the inner housing 2 in the first direction X, so that the cover plate 40 can seal the opening 11 and ensure that the electrolyte can smoothly enter the storage chamber 12 for storage.

[0058] As shown in Figure 4, the end of the battery cell body 30 facing the cover plate 40 is flush with the first end 21. In other embodiments, as shown in Figure 13, the end of the battery cell body 30 facing the cover plate 40 may also be lower than the first end 21, so that the inner shell 2 can completely cover the outer periphery of the battery cell body 30. This avoids the inner edge of the first end 21 of the inner shell 2 from squeezing the battery cell body 30 during the expansion process of the battery cell body 30 during charging and discharging, thereby reducing the risk of damaging the battery cell body 30 and improving the protection and restraint of the battery cell body 30.

[0059] In some embodiments, referring to Figures 4 and 5, the one-way guide 5 is disposed at the second end 22. The one-way guide 5 can be a one-way valve, and its one-way conduction principle is prior art, which will not be described in detail here. The one-way guide 5 is disposed at the second end 22 to make full use of the height of the inner shell 2, that is, to ensure full utilization of the electrolyte stored in the liquid storage chamber 12. In other embodiments, the one-way guide 5 can also be flexibly adjusted in position, as long as it can conduct the liquid storage chamber 12 and the liquid injection chamber 20 and has a distance from the first end 21 in the first direction X.

[0060] In some embodiments, referring to Figures 2 to 7, a plurality of liquid storage cavities 12 are provided, and the plurality of liquid storage cavities 12 are distributed around the outer periphery of the inner shell 2, and at least some of the liquid storage cavities 12 are interconnected.

[0061] Specifically, taking a prismatic battery as an example in this embodiment, referring to Figures 2 to 7, the inner casing 2 has a first side 23 and a second side 24 arranged opposite to each other in the second direction Y, and a third side 25 and a fourth side 26 arranged opposite to each other in the third direction Z. The first side 23, the second side 24, the third side 25, and the fourth side 26 of the inner casing 2 are spaced apart from the corresponding sides of the outer casing 1, that is, the first side 23, the second side 24, the third side 25, and the fourth side 26 of the inner casing 2 form a liquid storage cavity 12 with the outer casing 1. Each liquid storage cavity 12 surrounds the inner casing 2 and is interconnected, or it can be considered as multiple liquid storage cavities 12 interconnected to form an overall liquid storage cavity 12 surrounding the inner casing 2. Correspondingly, multiple unidirectional conductive elements 5 can be provided and arranged around the inner casing 2. The liquid storage cavities 12 surrounding the inner casing 2 and the multiple unidirectional conductive elements 5 facilitate the uniform storage and input of electrolyte towards the injection cavity 20, improving the storage capacity of the electrolyte and the uniformity of electrolyte replenishment.

[0062] It is understood that in other embodiments, some liquid storage chambers 12 may not be connected to other liquid storage chambers 12. In this case, a corresponding one-way conduction element 5 needs to be set for each individual liquid storage chamber 12 to ensure that the independent liquid storage chamber 12 can output electrolyte.

[0063] In addition, in some embodiments, there may be only one liquid storage chamber 12, located on one of the first side 23, the second side 24, the third side 25, and the fourth side 26. It is understood that, based on the designer's flexible choice, increasing the volume of the liquid storage chamber 12, while keeping the overall battery volume unchanged, will to some extent reduce the volume of the liquid injection chamber 20 and the volume of the cell body 30. In this case, with only one liquid storage chamber 12 located on one of the first side 23, the second side 24, the third side 25, and the fourth side 26, the other three sides of the inner shell 2 can be attached to the outer shell 1, and the volume of the liquid injection chamber 20 can be appropriately increased; this will not be elaborated further here.

[0064] In addition, in some embodiments, multiple liquid storage chambers 12 can also be provided. The difference from the above-mentioned scheme in which each liquid storage chamber 12 is connected is that multiple liquid storage chambers 12 can be distributed at least one of the first side 23, the second side 24, the third side 25 and the fourth side 26. In this case, the inner shell 2 is provided with a one-way guide 5 for each liquid storage chamber 12.

[0065] It should be noted that, in some embodiments, referring to Figures 2 and 4, the outer shell 1 and the inner shell 2 may be integrally formed or welded together.

[0066] Understandably, in order to quickly inject the electrolyte into the receiving cavity 10, both positive and negative pressure are used, that is, air is injected or evacuated into the receiving cavity 10 to ensure that the electrolyte is fully injected into the receiving cavity 10. However, during the evacuation process, there is a problem that the electrolyte may be drawn out of the receiving cavity 10, which affects the electrolyte injection efficiency.

[0067] In view of this, in some embodiments, referring to Figures 2 to 12, the battery further includes a flow guiding component 6, which is disposed in the liquid storage chamber 12. The flow guiding component 6 connects the outer shell 1 and the inner shell 2. The flow guiding component 6 separates the liquid storage chamber 12 and forms a flow guiding channel 60. The flow guiding channel 60 has a third end 600 and a fourth end 601 disposed opposite to each other in the first direction X. The third end 600 faces the cover plate 40. The flow guiding channel 60 is configured to prevent electrolyte from flowing from the fourth end 601 to the third end 600.

[0068] Due to the flow-blocking effect of the flow guiding component 6, the electrolyte that has been injected into the storage chamber 12 during the pumping process is difficult to flow from the fourth end 601 to the third end 600, thereby reducing the problem of electrolyte backflow and improving the electrolyte injection efficiency.

[0069] In some embodiments, referring to Figures 8 to 12, the flow guiding assembly 6 includes multiple sets of flow guiding groups, each set having multiple flow guiding sections 61. The multiple sets of flow guiding groups are arranged at intervals along a first direction X in the liquid storage chamber 12. The multiple flow guiding sections 61 of each set are arranged along a direction intersecting the first direction X, and a second gap 62 is provided between adjacent flow guiding sections 61. In two adjacent sets of flow guiding groups, at least a portion of the flow guiding sections 61 in one set is directly opposite the second gap 62 between two adjacent flow guiding sections 61 in the other set, and in the direction intersecting the first direction X, the width of the flow guiding section 61 facing the second gap 62 is a, and the width of the second gap 62 is b, satisfying a ≥ b.

[0070] Specifically, referring to the three embodiments shown in Figures 10 to 12, taking the flow guiding components 6 distributed on the first side 23 and the second side 24 of the inner shell 2 as an example, the multiple flow guiding parts 61 of each flow guiding group are arranged along the third direction Z. In other embodiments, taking the flow guiding components 6 corresponding to the third side 25 and the fourth side 26 of the inner shell 2 as an example, the multiple flow guiding parts 61 of each flow guiding group are arranged along the second direction Y.

[0071] In some embodiments, referring to FIG12, the flow guide 61 adopts a convex strip structure extending along the third direction Z. In the first direction X, the second gap 62 is opposite to the adjacent flow guide 61 to form an obstruction to the flow of electrolyte from the fourth end 601 to the third end 600.

[0072] In some embodiments, referring to FIG11, the flow guide 61 has a fifth end 610 and a sixth end 611 disposed opposite to each other in the first direction X, the fifth end 610 facing the cover plate 40, and the flow guide 61 has a flow guide surface 615 extending obliquely from the fifth end 610 toward the sixth end 611. In this embodiment, the flow guide surface 615 adopts an arc-shaped surface structure, and the entire flow guide 61 forms an arc-shaped extension structure. Compared with the embodiment shown in FIG12, the flow guide surface 615 is beneficial for guiding the electrolyte from the third end 600 to the fourth end 601, thereby improving the efficiency of electrolyte injection into the storage chamber 12.

[0073] In addition, in some embodiments, the flow guide 61 can be configured as a triangular structure, with one corner of the triangular flow guide 61 facing the adjacent second gap 62 in the first direction X. In this case, the two sides of the triangle forming the corner are the flow guide surface 615, and the third side of the triangle forms an obstruction to the flow of electrolyte from the fourth end 601 to the third end 600, which will not be described in detail here.

[0074] In some embodiments, referring to FIG10, the flow guide 61 includes a first sub-part 612, a second sub-part 613, and a third sub-part 614 connected together. The first sub-part 612 is disposed on the side of the second sub-part 613 and the third sub-part 614 facing the cover plate 40. The first sub-part 612 extends along a first direction X. A second gap 62 is formed between the second sub-part 613 of one of two adjacent flow guides 61 and the third sub-part 614 of the other. In the first direction X, at least a portion of the first sub-part 612 is directly opposite the second gap 62. The second sub-part 613 and the third sub-part 614 extend obliquely from the end connected to the first sub-part 612 toward the fourth end 601, and the extension direction of the second sub-part 613 and the extension direction of the third sub-part 614 form an angle. The first sub-part 612 has a seventh end 6120 that is away from the connected second sub-part 613, the second sub-part 613 has an eighth end 6130 that is away from the connected first sub-part 612, and the third sub-part 614 has a ninth end 6140 that is away from the connected first sub-part 612. In the direction intersecting the first direction X, the width of the seventh end 6120 is c, and the distance between the eighth end 6130 and the ninth end 6140 is d, satisfying b < d.

[0075] By setting the entire flow guide 61 in a Y shape, the first sub-part 612 can guide the electrolyte to flow from the third end 600 to the fourth end 601, while the second sub-part 613 and the third sub-part 614, which form an angle with each other, obstruct the upward flow of electrolyte in the lower second gap 62, that is, prevent the electrolyte from flowing from the fourth end 601 to the third end 600.

[0076] In addition, in other embodiments, the overall flow guiding component 6 may also adopt a Tesla valve structure, etc., with the aim of enabling the formed flow guiding channel 60 to guide the electrolyte from the third end 600 to the fourth end 601 and prevent the electrolyte from flowing from the fourth end 601 to the third end 600.

[0077] It is understood that in the above embodiments, the flow guide 61 can be integrally formed with the inner shell 2 and the outer shell 1. In some embodiments, to reduce manufacturing difficulty, assembly and maintenance difficulty, etc., referring to Figures 2, 4 to 9, the flow guide assembly 6 can be separately arranged from the inner shell 2 and the outer shell 1. The flow guide assembly 6 also includes a first enclosure 63 and a second enclosure 64. The flow guide 61 is connected between the first enclosure 63 and the second enclosure 64. The first enclosure 63, the second enclosure 64 and the flow guide 61 define a flow guide channel 60. The first enclosure 63, the second enclosure 64 and the flow guide 61 are disposed in the liquid storage cavity 12, and the first enclosure 63 is connected to the outer shell 1, and the second enclosure 64 is connected to the inner shell 2. The second enclosure 64 is provided with a connecting port 640 through the unidirectional guide member 5, and the connecting port 640 connects to the flow guide channel 60.

[0078] It should be noted that in some embodiments, the first enclosure 63 and the second enclosure 64 can be configured as a frame structure integrally formed and surrounding the inner shell 2, and the first enclosure 63, the second enclosure 64 and the flow guide 61 are integrally formed and assembled into the liquid storage cavity 12.

[0079] To further reduce the difficulty of manufacturing and assembly, this embodiment, referring to Figures 2, 6, and 9, employs a split-type first enclosure 63 and second enclosure 64 structure corresponding to the first side 23, second side 24, third side 25, and fourth side 26 of the inner shell 2, respectively, to ensure distribution around the inner shell 2. Referring simultaneously to Figure 8, the multiple liquid storage chambers 12 formed by the split-type first enclosure 63 and second enclosure 64 are interconnected via a connecting port 640 and a notch corresponding to the connecting port 640 at the first enclosure 63. The first enclosure 63 and second enclosure 64 can be made of the same material as the inner shell 2 and the outer shell 1, ensuring that they can avoid reaction with the electrolyte.

[0080] Accordingly, this application provides a battery pack including the aforementioned battery. This battery pack can be applied to electronic devices, energy storage devices, electric vehicles, and other equipment. It is understood that this battery pack can possess all the technical features and corresponding beneficial effects of the aforementioned battery, which will not be elaborated upon here.

[0081] The present application provides a detailed description of a battery and 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 battery, wherein, The battery has a first orientation, and the battery includes: The outer shell has a receiving cavity and an opening communicating with the receiving cavity; An inner shell is disposed in the receiving cavity, the inner shell has a liquid injection cavity, the liquid injection cavity communicates with the opening in the first direction, and a liquid storage cavity is formed between the inner shell and the outer shell; An electrode assembly is disposed in the injection chamber; A cover assembly is provided on the opening, the cover assembly and the inner shell have a first gap in the first direction, and the first gap connects the injection chamber and the storage chamber, the cover assembly has an injection hole, and the injection hole connects to the injection chamber; A one-way flow element is disposed in the inner housing, and the one-way flow element is configured to enable the liquid storage chamber to unidirectionally flow into the injection chamber when the pressure of the liquid storage chamber exceeds a threshold.

2. The battery according to claim 1, wherein, The inner housing has a first end and a second end disposed opposite to each other in the first direction, the first end facing the cover assembly, and the unidirectional guide is disposed at the second end.

3. The battery according to claim 1 or 2, wherein, The battery further includes a flow guiding component disposed in the liquid storage cavity. The flow guiding component connects the outer shell and the inner shell. The flow guiding component separates the liquid storage cavity and forms a flow guiding channel. The flow guiding channel has a third end and a fourth end that are disposed opposite to each other in the first direction. The third end faces the cover assembly. The flow guiding channel is configured to prevent electrolyte from flowing from the fourth end to the third end.

4. The battery according to claim 3, wherein, The flow guiding assembly includes multiple flow guiding groups, each flow guiding group having multiple flow guiding parts. The multiple flow guiding groups are arranged at intervals along a first direction in the liquid storage cavity. The multiple flow guiding parts of each flow guiding group are arranged along directions intersecting the first direction, and there is a second gap between adjacent flow guiding parts. In two adjacent groups of guide sections, at least a portion of the guide section in one group is directly opposite the second gap between two adjacent guide sections in the other group, and in the direction intersecting the first direction, the width of the guide section directly opposite the second gap is a, and the width of the second gap is b, satisfying a≥b.

5. The battery according to claim 4, wherein, The battery also has a second direction that intersects with the first direction; and a plurality of the flow guides in each flow guide group are arranged along the second direction.

6. The battery according to claim 5, wherein, The battery also has a third direction, wherein the first direction, the second direction, and the third direction intersect each other; The plurality of flow guides in each flow guide group are arranged along the third direction.

7. The battery according to claim 6, wherein, The guide section is a convex strip structure extending in the third direction.

8. The battery according to claim 7, wherein, In the first direction, the second gap is opposite to the adjacent flow guide to form an obstruction to the flow of electrolyte from the fourth end to the third end.

9. The battery according to claim 4, wherein, The flow guide has a fifth end and a sixth end disposed opposite to each other in a first direction, the fifth end facing the cover assembly, and the flow guide has a flow guide surface that slopes from the fifth end toward the sixth end.

10. The battery according to claim 9, wherein, The guide surface has an arc-shaped structure, and the entire guide part forms an arc-shaped extended structure.

11. The battery according to claim 9, wherein, The flow guide is a triangular structure; one corner of the flow guide is directly opposite the adjacent second gap in the first direction, and the two sides of the triangle forming this corner are the flow guide surface, and the third side of the triangle forms an obstruction to the flow of electrolyte from the fourth end to the third end.

12. The battery according to claim 4, wherein, The flow guide includes a first sub-part, a second sub-part, and a third sub-part connected to each other. The first sub-part is disposed on the side of the second sub-part and the third sub-part facing the cover assembly. The first sub-part extends along the first direction. A second gap is formed between the second sub-part of one of two adjacent flow guides and the third sub-part of the other in each group of flow guides. In the first direction, at least a portion of the first sub-part is directly opposite the second gap, and the second sub-part and the third sub-part extend obliquely from the end connected to the first sub-part toward the fourth end, and the extension direction of the second sub-part and the extension direction of the third sub-part form an angle. The first sub-part has a seventh end that is away from the connected second sub-part, the second sub-part has an eighth end that is away from the connected first sub-part, and the third sub-part has a ninth end that is away from the connected first sub-part. In the direction intersecting the first direction, the width of the seventh end is c, which satisfies b≥c, and the distance between the eighth end and the ninth end is d, which satisfies b<d.

13. The battery according to claim 4, wherein, The flow guiding assembly further includes a first enclosure and a second enclosure, and the flow guiding part is connected between the first enclosure and the second enclosure. The first enclosure, the second enclosure and the flow guiding part define the flow guiding channel. The first enclosure, the second enclosure and the flow guiding part are disposed in the liquid storage cavity, and the first enclosure is connected to the outer shell and the second enclosure is connected to the inner shell. The second enclosure has a through-hole facing the unidirectional guide member, and the through-hole is connected to the flow channel.

14. The battery according to claim 13, wherein, The first enclosure and the second enclosure are integrally formed and surround the inner shell in a frame structure. The first enclosure, the second enclosure and the flow guide are integrally formed and assembled into the liquid storage cavity.

15. The battery according to claim 3, wherein, The liquid storage chamber is provided in multiple ways, and the multiple liquid storage chambers are distributed around the outer periphery of the inner shell, and at least some of the liquid storage chambers are interconnected.

16. The battery according to claim 3, wherein, The battery also has a second direction and a third direction, wherein the first direction, the second direction and the third direction intersect each other; The inner housing has a first side and a second side disposed opposite to each other in the second direction, and the inner housing has a third side and a fourth side disposed opposite to each other in the third direction; The liquid storage chamber is located on one of the first side, the second side, the third side, and the fourth side.

17. The battery according to claim 16, wherein, A split first enclosure and a second enclosure structure are respectively provided on the first side, the second side, the third side and the fourth side of the inner shell; The multiple liquid storage chambers formed by the split first and second enclosures are interconnected by a connecting port and a notch provided at the corresponding connecting port on the first enclosure.

18. The battery according to claim 3, wherein, The battery also has a second direction and a third direction, wherein the first direction, the second direction and the third direction intersect each other; The inner housing has a first side and a second side disposed opposite to each other in the second direction, and the inner housing has a third side and a fourth side disposed opposite to each other in the third direction; The liquid storage chamber is provided in multiple ways, and the multiple liquid storage chambers are distributed at intervals on at least one of the first side, the second side, the third side and the fourth side. The inner shell is provided with the one-way guide for each liquid storage chamber.

19. The battery according to claim 1, wherein, The inner housing has a first end facing the cover assembly in the first direction; The electrode assembly includes a battery cell body and a tab connected to the battery cell body. The tab is located at one end of the battery cell body facing the cover assembly. In the first direction, the end of the battery cell body facing the cover assembly is lower than or flush with the first end.

20. A battery pack, wherein, Includes the battery as described in any one of claims 1 to 19.

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