Battery and battery pack

Abstract

The invention discloses a battery and a battery pack, and belongs to the technical field of batteries, and the battery comprises an outer shell which is provided with a containing cavity and an opening communicated with the containing cavity; the inner shell is arranged in the containing cavity, the inner shell is provided with a liquid injection cavity, the liquid injection cavity communicates with the opening in the first direction, and a liquid storage cavity is defined between the inner shell and the outer shell; the electrode assembly is arranged in the liquid injection cavity; the cover body assembly covers the opening, a first gap is formed between the cover body assembly and the inner shell in the first direction, the first gap communicates with the liquid injection cavity and the liquid storage cavity, a liquid injection hole is formed in the cover body assembly, and the liquid injection hole communicates with the liquid injection cavity; and the one-way conducting piece is arranged in the inner shell, and the one-way conducting piece is configured to enable the liquid storage cavity to be in one-way communication with the liquid injection cavity when the pressure of the liquid storage cavity exceeds a threshold value. The problem of wrinkles generated by the electrode assembly in the charging and discharging process of the battery is reduced, and the cycle service life of the battery is prolonged.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery and a battery pack. Background Art

[0002] Lithium batteries will continuously consume electrolyte and generate gas during use. As the electrolyte is consumed to a certain extent, it is easy to cause the problem of insufficient electrode wetting, which in turn leads to lithium deposition on the electrode and a significant reduction in capacity retention, affecting the cycle life of the battery. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a battery to solve the above-mentioned technical problems; another purpose of the present application is to provide a battery pack using the above-mentioned battery.

[0004] Technical solution: A battery according to an embodiment of the present application, the battery has a first direction, and the battery includes:

[0005] An outer shell having a receiving cavity and an opening communicating with the receiving cavity;

[0006] An inner shell is disposed in the accommodating cavity, the inner shell has a liquid injection cavity, the liquid injection cavity is connected to the opening in the first direction, and a liquid storage cavity is formed between the inner shell and the outer shell;

[0007] An electrode assembly, disposed in the liquid injection cavity;

[0008] a cover assembly, which covers the opening, wherein a first gap is formed between the cover assembly and the inner shell in the first direction, and the first gap communicates with the injection cavity and the liquid storage cavity, and the cover assembly is provided with an injection hole, and the injection hole communicates with the injection cavity;

[0009] The one-way conductive member is disposed on the inner shell, and is configured to enable the liquid storage chamber to conduct one-way flow through the liquid injection chamber when the pressure of the liquid storage chamber exceeds a threshold value.

[0010] In some embodiments, the inner shell has a first end and a second end that are oppositely disposed in the first direction, the first end faces the cover assembly, and the one-way conductive member is disposed at the second end.

[0011] In some embodiments, the battery further includes a flow guide component, which is disposed in the liquid storage chamber, the flow guide component connects the outer shell and the inner shell, the flow guide component separates the liquid storage chamber and forms a flow guide channel, the flow guide channel has a third end and a fourth end relatively disposed in the first direction, the third end faces the cover body assembly, and the flow guide channel is configured to be able to hinder the electrolyte from flowing from the fourth end to the third end.

[0012] In some embodiments, the flow guide assembly includes a plurality of flow guide groups, each flow guide group has a plurality of the flow guide parts, the plurality of flow guide groups are arranged in the liquid storage chamber at intervals along a first direction, the plurality of the flow guide parts of each flow guide group are arranged along a direction intersecting the first direction, and a second gap is provided between adjacent flow guide parts;

[0013] In two adjacent groups of the guide groups, at least part of the guide portions in one group are directly opposite to the second gap between two adjacent guide portions in the other group, and in a direction intersecting the first direction, the width of the guide portion directly opposite to the second gap is a, and the width of the second gap is b, satisfying a≥b.

[0014] In some embodiments, the guide portion has a fifth end and a sixth end that are relatively arranged in the first direction, the fifth end faces the cover assembly, and the guide portion has a guide surface that is inclined from the fifth end toward the sixth end.

[0015] In some embodiments, the guide portion includes a first sub-portion, a second sub-portion, and a third sub-portion connected to each other, the first sub-portion is arranged on a side of the second sub-portion and the third sub-portion facing the cover assembly, the first sub-portion extends along the first direction, and the second gap is formed between the second sub-portion of one of the two adjacent guide portions in each group of the guide portions and the third sub-portion of the other;

[0016] In the first direction, at least a portion of the first sub-section is directly opposite to the second gap, the second sub-section and the third sub-section respectively extend obliquely from one end connected to the first sub-section toward the fourth end, and an extension direction of the second sub-section and an extension direction of the third sub-section form an angle;

[0017] The first sub-section has a seventh end away from the connected second sub-section, the second sub-section has an eighth end away from the connected first sub-section, and the third sub-section has a ninth end away from the connected first sub-section. In a direction intersecting the first direction, the width of the seventh end is c, satisfying b≥c, and the distance between the eighth end and the ninth end is d, satisfying b<d.

[0018] In some embodiments, the flow guide assembly further includes a first enclosure and a second enclosure, the flow guide portion is connected between the first enclosure and the second enclosure, the first enclosure, the second enclosure and the flow guide portion define the flow guide channel, the first enclosure, the second enclosure and the flow guide portion are arranged 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;

[0019] A communication opening is formed in the second enclosure toward the one-way conducting member, and the communication opening is connected to the guide channel.

[0020] In some embodiments, the liquid storage chambers are provided in plurality, the plurality of liquid storage chambers are distributed around the outer circumference of the inner shell, and at least some of the liquid storage chambers are interconnected.

[0021] In some embodiments, the battery further has a second direction and a third direction, and the first direction, the second direction and the third direction intersect each other;

[0022] The inner shell has a first side and a second side that are oppositely arranged in the second direction, and the inner shell has a third side and a fourth side that are oppositely arranged in the third direction;

[0023] The liquid storage chamber is disposed on one of the first side, the second side, the third side, and the fourth side.

[0024] In some embodiments, the battery further has a second direction and a third direction, and the first direction, the second direction and the third direction intersect each other;

[0025] The inner shell has a first side and a second side that are oppositely arranged in the second direction, and the inner shell has a third side and a fourth side that are oppositely arranged in the third direction;

[0026] The liquid storage chambers are provided in plurality, and the plurality of liquid storage chambers are spaced and distributed on at least one of the first side, the second side, the third side and the fourth side, and the inner shell is provided with the one-way conductive member corresponding to each of the liquid storage chambers.

[0027] In some embodiments, the inner shell has a first end facing the cover assembly in the first direction;

[0028] 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, and in the first direction, the end of the battery cell body facing the cover assembly is lower than the first end or flush with the first end.

[0029] Correspondingly, a battery pack described in an embodiment of the present application includes the above-mentioned battery.

[0030] Beneficial effects: A battery according to an embodiment of the present application includes an outer shell, an inner shell, an electrode assembly, a cover assembly, and a one-way conductor. The outer shell has a receiving chamber and an opening connected to the receiving chamber, the inner shell is arranged in the receiving chamber, the inner shell has a liquid injection chamber, the liquid injection chamber is connected to the opening in a first direction, and a liquid storage chamber is surrounded between the inner shell and the outer shell. The electrode assembly is arranged in the liquid injection chamber, the cover assembly is arranged to cover the opening, the cover assembly and the inner shell have a first gap in the first direction, the first gap connects the liquid injection chamber and the liquid storage chamber, the cover assembly is provided with a liquid injection hole, and the liquid injection hole is connected to the liquid injection chamber. The one-way conductor is arranged in the inner shell, and the one-way conductor is configured to enable the liquid storage chamber to conduct one-way to the liquid injection chamber when the pressure of the liquid storage chamber exceeds a threshold value. Electrolyte is injected into the injection cavity through the injection hole, and part of the electrolyte flows into the liquid storage cavity through the first gap and is stored. During the use of the battery, the electrolyte in the injection cavity is consumed and gas is generated. The gas enters the liquid storage cavity through the first gap. As the gas increases until it reaches the conduction pressure threshold of the one-way conductor, the electrolyte stored in the liquid storage cavity is pressed into the injection cavity by the gas, thereby replenishing the electrolyte in the injection cavity and infiltrating the electrode assembly, which is beneficial to prolonging the battery cycle life. In addition, the inner shell forms a restraining effect on the electrode assembly, which is beneficial to reducing the wrinkles generated during the charge and discharge process of the electrode assembly and improving the stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a schematic diagram of the structure of a battery in an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the explosion structure of the battery of the embodiment of the present application;

[0034] Figure 3 is a structural schematic diagram of a cover assembly of a battery according to an embodiment of the present application viewed from the first direction;

[0035] Figure 4 yes Figure 3 Sectional view along line AA;

[0036] Figure 5 yes Figure 3 Sectional view along line BB;

[0037] Figure 6 It is a schematic diagram of the structure of the accommodating chamber, the liquid injection chamber and the liquid storage chamber in the embodiment of the present application;

[0038] Figure 7 yes Figure 6 Sectional view along line CC;

[0039] Figure 8 It is a schematic diagram of the structure of the diversion assembly of the embodiment of the present application;

[0040] Fig. 9 It is a structural schematic diagram of a split-type flow guide assembly according to an embodiment of the present application;

[0041] Fig.10 It is a structural schematic diagram of a flow guide portion according to an embodiment of the present application;

[0042] Fig.11 is a schematic structural diagram of a flow guide portion of another embodiment of the present application;

[0043] Fig.12 is a schematic structural diagram of a flow guide portion of another embodiment of the present application;

[0044] Fig.13 is a cross-sectional view of another embodiment of the present application in which the inner shell is higher than the battery cell body;

[0045] Reference numerals: 1, outer shell; 10, accommodating 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, battery cell body; 31, pole ear; 4, cover assembly; 40, cover plate; 41, liquid injection hole; 42, insulating member; 43, pole; 5, one-way conductive member; 6, flow guide assembly; 60 , flow guide channel; 600, third end; 601, fourth end; 61, flow guide 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 guide 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 DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0048] At present, lithium batteries will continuously consume electrolyte and generate gas during use. As the electrolyte is consumed to a certain extent, it is easy to cause the problem of insufficient electrode wetting, which in turn leads to lithium deposition of the electrode and a significant reduction in capacity retention rate, affecting the cycle life of the battery.

[0049] In addition, during the battery charging and discharging process, the electrode inside the battery will expand. Some power batteries do not restrain this expansion, which can easily cause uneven stress release of the electrode, and then cause the electrode to wrinkle, affecting the stability of battery use.

[0050] In view of this, refer to Figures 1 to 13 , an embodiment of the present application provides a battery, aiming to solve at least one of the above-mentioned technical problems.

[0051] 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. Figure 1 , wherein the first direction X is roughly parallel to the height direction of the entire battery, the second direction Y is roughly parallel to the thickness direction of the entire battery, and the third direction Z is roughly parallel to the length direction of the entire battery.

[0052] Reference Figures 1 to 7 A battery includes an outer shell 1, an inner shell 2, an electrode assembly 3, a cover assembly 4 and a one-way conductor 5.

[0053] The outer shell 1 has a receiving cavity 10 and an opening 11 connected to the receiving cavity 10, the inner shell 2 is arranged in the receiving cavity 10, the inner shell 2 has a liquid injection cavity 20, the liquid injection cavity 20 is connected to the opening 11 in the first direction X, and a liquid storage cavity 12 is surrounded between the inner shell 2 and the outer shell 1. The electrode assembly 3 is arranged in the liquid injection cavity 20, the cover assembly 4 is covered on the opening 11, the cover assembly 4 and the inner shell 2 have a first gap 13 in the first direction X, the first gap 13 connects the liquid injection cavity 20 and the liquid storage cavity 12, the cover assembly 4 is provided with a liquid injection hole 41, and the liquid injection hole 41 is connected to the liquid injection cavity 20. The one-way conductor 5 is arranged in the inner shell 2, and the one-way conductor 5 is configured to enable the liquid storage cavity 12 to unidirectionally conduct to the liquid injection cavity 20 when the pressure of the liquid storage cavity 12 exceeds a threshold value.

[0054] Electrolyte is injected into the injection cavity 20 through the injection hole 41, and part of the electrolyte flows into the liquid storage cavity 12 through the first gap 13 and is stored. During the use of the battery, the electrolyte in the injection cavity 20 is consumed and gas is generated. The gas enters the liquid storage cavity 12 through the first gap 13. As the generated gas increases until it reaches the conduction pressure threshold of the one-way conductor 5, the electrolyte stored in the liquid storage cavity 12 can rely on the pressure of the gas to pass through the one-way conductor 5 into the injection cavity 20, thereby replenishing the electrolyte for the injection cavity 20 and infiltrating the electrode assembly 3, which is beneficial to prolonging the battery cycle life. During the battery charging and discharging process, the inner shell 2 also forms a restraining effect on the electrode assembly 3, and the liquid storage cavity 12 can also serve as a buffer space for the electrode assembly 3 to expand, which is beneficial to reduce the wrinkling problem generated during the charging and discharging process of the electrode assembly 3 and improve the stability of the battery.

[0055] In some embodiments, reference Figure 2 , Figure 4 and Figure 5 The cover assembly 4 includes a cover plate 40, an insulating member 42 and a pole 43. The cover plate 40 covers the opening 11, and the injection hole 41 is opened in the cover plate 40. The insulating member 42 is arranged 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 pole 43 is passed through the cover plate 40 and is used to electrically connect the electrode assembly 3. Figure 4 As shown in , the first gap 13 is formed between the cap plate 40 and the electrode assembly 3 .

[0056] In some embodiments, reference Figure 4 and Figure 5, the inner shell 2 has a first end 21 and a second end 22 that are arranged opposite to each other in the first direction X, and the first end 21 faces the cover plate 40. The electrode assembly 3 includes a battery cell body 30 and a pole ear 31 connected to the battery cell body 30, and the pole ear 31 is located at one end of the battery cell body 30 facing the cover plate 40, so as to facilitate electrical connection to the pole 43. In the first direction X, the end of the battery cell body 30 facing the cover plate 40 does not protrude from the first end 21. In this embodiment, it is taken as an example that the end of the battery cell body 30 facing the cover plate 40 is flush with the first end 21. In other embodiments, the end of the battery cell body 30 facing the cover plate 40 may also be lower than the first end 21. At the same time, the height of the outer shell 1 in the first direction X is greater than the height of the inner shell 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 liquid storage chamber 12 for storage.

[0057] The end of the cell body 30 facing the cover plate 40 is as follows Figure 4 flush with the first end 21. In other embodiments, Fig.13 As shown, 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 peripheral side of the battery cell body 30, avoiding the inner edge of the first end 21 of the inner shell 2 from squeezing the battery cell body 30 during the expansion 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.

[0058] In some embodiments, reference Figure 4 and Figure 5 , the one-way conducting member 5 is arranged at the second end 22. The one-way conducting member 5 can be a one-way valve, and its one-way conducting principle is a prior art and will not be described in detail here. The one-way conducting member 5 is arranged at the second end 22 to fully utilize the height of the inner shell 2, that is, to ensure that the electrolyte stored in the liquid storage chamber 12 is fully utilized. In other embodiments, the one-way conducting member 5 can also flexibly adjust the setting position to meet the requirements of being able to conduct the liquid storage chamber 12 and the liquid injection chamber 20 and being at a distance from the first end 21 in the first direction X.

[0059] In some embodiments, reference Figures 2 to 7 There are multiple liquid storage chambers 12, and the multiple liquid storage chambers 12 are distributed around the outer circumference of the inner shell 2, and at least some of the liquid storage chambers 12 are connected to each other.

[0060] Specifically, in this embodiment, square shell battery is taken as an example, referring to Figures 2 to 7The inner shell 2 has a first side 23 and a second side 24 arranged opposite to each other in the second direction Y, and has 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 shell 2 are spaced from the corresponding sides of the outer shell 1, that is, the first side 23, the second side 24, the third side 25 and the fourth side 26 of the inner shell 2 respectively form a liquid storage cavity 12 with the outer shell 1, and each liquid storage cavity 12 surrounds the inner shell 2 and is connected to each other, and can also be regarded as a plurality of liquid storage cavities 12 connected to form an integral liquid storage cavity 12 surrounding the inner shell 2. Correspondingly, a plurality of one-way conductive members 5 can be provided and arranged around the inner shell 2. The liquid storage cavity 12 surrounding the inner shell 2 and the plurality of one-way conductive members 5 are conducive to uniformly storing and inputting electrolyte toward the injection cavity 20, thereby increasing the storage capacity of the electrolyte and the uniformity of replenishing the electrolyte.

[0061] It is understandable 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 conductive member 5 needs to be provided for each individual liquid storage chamber 12 to ensure that the independent liquid storage chamber 12 can output electrolyte.

[0062] In addition, in some embodiments, only one liquid storage chamber 12 may be provided, and the liquid storage chamber 12 is provided on one of the first side 23, the second side 24, the third side 25, and the fourth side 26. It is understandable that, according to the flexible choice of the designer, under the condition that the overall battery volume remains unchanged, increasing the volume of the liquid storage chamber 12 will reduce the volume of the injection chamber 20 and the volume of the battery cell body 30 to a certain extent. If one liquid storage chamber 12 is provided and is provided 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 close to the outer shell 1 and the volume of the injection chamber 20 can be appropriately expanded, which will not be repeated here.

[0063] In addition, in some embodiments, there may also be multiple liquid storage chambers 12. The difference from the above-mentioned solution in which the liquid storage chambers 12 are connected is that the multiple liquid storage chambers 12 may be distributed at intervals on 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 unidirectional conductive member 5 corresponding to each liquid storage chamber 12.

[0064] It should be noted that, in some embodiments, referring to Figure 2 and Figure 4 The outer shell 1 and the inner shell 2 can be integrally formed or welded together.

[0065] It is understandable that in order to quickly inject the electrolyte into the receiving chamber 10, positive pressure and negative pressure are used, that is, the receiving chamber 10 is inflated or evacuated to ensure that the electrolyte is fully injected into the receiving chamber 10. However, during the evacuation process, there is a problem of extracting the electrolyte out of the receiving chamber 10, which affects the injection efficiency of the electrolyte.

[0066] In view of this, in some embodiments, referring to Figures 2 to 12 The battery also includes a guide component 6, which is arranged in the liquid storage chamber 12. The guide component 6 connects the outer shell 1 and the inner shell 2. The guide component 6 separates the liquid storage chamber 12 and forms a guide channel 60. The guide channel 60 has a third end 600 and a fourth end 601 that are relatively arranged in the first direction X. The third end 600 faces the cover plate 40. The guide channel 60 is configured to prevent the electrolyte from flowing from the fourth end 601 to the third end 600.

[0067] Due to the flow blocking effect of the flow guide component 6, the electrolyte that has been injected into the liquid storage chamber 12 during the air extraction process is difficult to flow from the fourth end 601 to the third end 600, thereby reducing the problem of electrolyte reflux and improving the electrolyte injection efficiency.

[0068] In some embodiments, reference Figures 8 to 12 The flow guide assembly 6 includes a plurality of flow guide groups, each flow guide group has a plurality of flow guide portions 61, and the plurality of flow guide groups are arranged in the liquid storage chamber 12 at intervals along the first direction X. The plurality of flow guide portions 61 of each flow guide group are arranged along a direction intersecting the first direction X, and a second gap 62 is provided between adjacent flow guide portions 61. Among two adjacent flow guide groups, at least a portion of the flow guide portions 61 in one group are directly opposite to the second gap 62 between two adjacent flow guide portions 61 in the other group, and in the direction intersecting the first direction X, the width of the flow guide portion 61 directly opposite to the second gap 62 is a, and the width of the second gap 62 is b, satisfying a≥b.

[0069] Specifically, refer to Figures 10 to 12 In the three embodiments shown, taking the guide assembly 6 distributed on the first side 23 and the second side 24 of the inner shell 2 as an example, the multiple guide portions 61 of each guide group are arranged along the third direction Z. In other embodiments, taking the guide assembly 6 corresponding to the third side 25 and the fourth side 26 of the inner shell 2 as an example, the multiple guide portions 61 of each guide group are arranged along the second direction Y.

[0070] In some embodiments, reference Fig.12 The guide portion 61 is a convex strip structure extending along the third direction Z. In the first direction X, the second gap 62 is opposite to the adjacent guide portion 61 to form an obstacle to the electrolyte flowing from the fourth end 601 to the third end 600 .

[0071] In some embodiments, reference Fig.11 The guide portion 61 has a fifth end 610 and a sixth end 611 that are arranged opposite to each other in the first direction X. The fifth end 610 faces the cover plate 40, and the guide portion 61 has a guide surface 615 that is inclined from the fifth end 610 toward the sixth end 611. In this embodiment, the guide surface 615 adopts an arc surface structure, and the entire guide portion 61 forms an arc extension structure. Compared with Fig.12 In the illustrated embodiment, the guide surface 615 is helpful in guiding the electrolyte to flow from the third end 600 to the fourth end 601 , thereby improving the efficiency of injecting the electrolyte into the liquid storage chamber 12 .

[0072] In addition, in some embodiments, the guide portion 61 can also be set to a triangular structure, such as a triangle structure, with one corner of the triangular guide portion 61 facing the adjacent second gap 62 in the first direction X. At this time, the two sides of the triangle forming the angle are the guide surface 615, and the third side of the triangle forms an obstacle to the electrolyte flowing from the fourth end 601 to the third end 600, which will not be repeated here.

[0073] In some embodiments, reference Fig.10 The air guide portion 61 includes a first sub-portion 612, a second sub-portion 613 and a third sub-portion 614 connected to each other. The first sub-portion 612 is disposed on the side of the second sub-portion 613 and the third sub-portion 614 facing the cover plate 40. The first sub-portion 612 extends along the first direction X. A second gap 62 is formed between the second sub-portion 613 of one of the two adjacent air guide portions 61 in each group of air guide portions 61 and the third sub-portion 614 of the other. In the first direction X, at least a portion of the first sub-portion 612 faces the second gap 62. The second sub-portion 613 and the third sub-portion 614 extend obliquely from one end connected to the first sub-portion 612 toward the fourth end 601, and an angle is formed between the extension direction of the second sub-portion 613 and the extension direction of the third sub-portion 614. The first sub-portion 612 has a seventh end 6120 away from the connected second sub-portion 613, the second sub-portion 613 has an eighth end 6130 away from the connected first sub-portion 612, and the third sub-portion 614 has a ninth end 6140 away from the connected first sub-portion 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.

[0074] By setting the guide portion 61 in a Y shape as a whole, the first sub-portion 612 can guide the electrolyte to flow from the third end 600 to the fourth end 601, and the second sub-portion 613 and the third sub-portion 614 forming an angle with each other form an obstacle to the upward flow of electrolyte in the second gap 62 below, that is, to hinder the electrolyte from flowing from the fourth end 601 to the third end 600.

[0075] In addition, in other embodiments, the overall flow guide component 6 may also adopt a Tesla valve structure, etc., so as to realize that the formed flow guide channel 60 can guide the electrolyte to flow from the third end 600 to the fourth end 601 and hinder the electrolyte from flowing from the fourth end 601 to the third end 600.

[0076] It is understandable that in the above embodiments, the guide portion 61 can be directly integrally formed with the inner shell 2 and the outer shell 1. In some embodiments, in order to reduce the difficulty of process manufacturing, assembly and maintenance, etc., refer to Figure 2 , Figures 4 to 9 , the flow guide assembly 6 can be separately arranged with 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, and the flow guide portion 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 portion 61 define a flow guide channel 60. The first enclosure 63, the second enclosure 64 and the flow guide portion 61 are arranged in the liquid storage chamber 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 penetrated by a communication port 640 toward the one-way guide member 5, and the communication port 640 is connected to the flow guide channel 60.

[0077] It should be noted that, in some embodiments, the first enclosure 63 and the second enclosure 64 can be set to a frame structure that is integrally formed and surrounds the inner shell 2, and the first enclosure 63, the second enclosure 64 and the guide portion 61 are integrally formed and assembled into the liquid storage chamber 12.

[0078] In order to further reduce the difficulty of process manufacturing and assembly, Figure 2 , Figure 6 and Fig. 9 , a split first enclosure 63 and a second enclosure 64 structure are respectively provided on the first side 23, the second side 24, the third side 25 and the fourth side 26 of the inner shell 2, so as to be distributed around the inner shell 2. Figure 8 The multiple liquid storage chambers 12 formed by the split first enclosure 63 and the second enclosure 64 are connected to each other by means of the communication port 640 and the notch provided at the first enclosure 63 corresponding to the communication port 640. The first enclosure 63 and the second enclosure 64 can be made of the same material as the inner shell 2 and the outer shell 1, as long as they can avoid reaction with the electrolyte.

[0079] In addition, it should be noted that, in some embodiments, reference Figure 4 and Figure 6 The battery also includes an explosion-proof valve 7 arranged on the outer shell 1. The explosion-proof valve 7 and the cover plate 40 are arranged in the first direction X. By arranging the explosion-proof valve 7 and the pole 43 away from each other, it is helpful to reduce the damage of the high-temperature gas to the electrical connection structure on the side of the battery pole 43 when thermal runaway occurs in the battery, thereby improving the protection of the electrical connection structure of the battery.

[0080] Accordingly, an embodiment of the present application provides a battery pack, which includes the above-mentioned battery. The battery pack can be applied to electronic equipment, power storage equipment, power vehicles and other equipment. It can be understood that the battery pack can have all the technical features and corresponding beneficial effects of the above-mentioned batteries, which will not be repeated here.

[0081] The above is a detailed introduction to a battery and a battery pack provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: The battery has a first orientation, the battery comprising: An outer shell having a receiving cavity and an opening communicating with the receiving cavity; An inner shell is disposed in the accommodating cavity, the inner shell has a liquid injection cavity, the liquid injection cavity is connected to the opening in the first direction, and a liquid storage cavity is formed between the inner shell and the outer shell; An electrode assembly, disposed in the liquid injection cavity; a cover assembly, which covers the opening, wherein a first gap is formed between the cover assembly and the inner shell in the first direction, and the first gap communicates with the injection cavity and the liquid storage cavity, and the cover assembly is provided with an injection hole, and the injection hole communicates with the injection cavity; The one-way conductive member is disposed on the inner shell, and is configured to enable the liquid storage chamber to conduct one-way flow through the liquid injection chamber when the pressure of the liquid storage chamber exceeds a threshold value.

2. The battery according to claim 1, characterized in that The inner shell has a first end and a second end that are oppositely arranged in the first direction, the first end faces the cover assembly, and the one-way conductive member is arranged at the second end.

3. The battery according to claim 1 or 2, characterized in that: The battery also includes a flow guide component, which is arranged in the liquid storage cavity, the flow guide component connects the outer shell and the inner shell, the flow guide component divides the liquid storage cavity and forms a flow guide channel, the flow guide channel has a third end and a fourth end arranged opposite to each other in the first direction, the third end faces the cover body assembly, and the flow guide channel is configured to be able to hinder the electrolyte from flowing from the fourth end to the third end.

4. The battery according to claim 3, characterized in that The flow guide assembly includes a plurality of flow guide groups, each flow guide group has a plurality of the flow guide parts, the plurality of flow guide groups are arranged in the liquid storage chamber at intervals along a first direction, the plurality of the flow guide parts of each flow guide group are arranged along a direction intersecting the first direction, and a second gap is provided between adjacent flow guide parts; In two adjacent groups of the guide groups, at least part of the guide portions in one group are directly opposite to the second gap between two adjacent guide portions in the other group, and in a direction intersecting the first direction, the width of the guide portion directly opposite to the second gap is a, and the width of the second gap is b, satisfying a≥b.

5. The battery according to claim 4, characterized in that The guide portion has a fifth end and a sixth end that are oppositely arranged in the first direction, the fifth end faces the cover assembly, and the guide portion has a guide surface that is inclined from the fifth end toward the sixth end.

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

7. The battery according to claim 4, characterized in that The flow guide assembly further includes a first enclosure and a second enclosure, the flow guide portion is connected between the first enclosure and the second enclosure, the first enclosure, the second enclosure and the flow guide portion define the flow guide channel, the first enclosure, the second enclosure and the flow guide portion are arranged in the liquid storage chamber, and the first enclosure is connected to the outer shell, and the second enclosure is connected to the inner shell; A communication opening is formed in the second enclosure toward the one-way conducting member, and the communication opening is connected to the guide channel.

8. The battery according to claim 3, characterized in that There are a plurality of liquid storage cavities, which are distributed around the outer circumference of the inner shell, and at least some of the liquid storage cavities are interconnected.

9. The battery according to claim 3, characterized in that The battery also has a second direction and a third direction, and the first direction, the second direction and the third direction intersect each other; The inner shell has a first side and a second side that are oppositely arranged in the second direction, and the inner shell has a third side and a fourth side that are oppositely arranged in the third direction; The liquid storage chamber is disposed on one of the first side, the second side, the third side, and the fourth side.

10. The battery according to claim 3, characterized in that The battery also has a second direction and a third direction, and the first direction, the second direction and the third direction intersect each other; The inner shell has a first side and a second side that are oppositely arranged in the second direction, and the inner shell has a third side and a fourth side that are oppositely arranged in the third direction; The liquid storage chambers are provided in plurality, and the plurality of liquid storage chambers are spaced and distributed on at least one of the first side, the second side, the third side and the fourth side, and the inner shell is provided with the one-way conductive member corresponding to each of the liquid storage chambers.

11. The battery according to claim 1, characterized in that The inner shell 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, and in the first direction, the end of the battery cell body facing the cover assembly is lower than the first end or flush with the first end.

12. A battery pack, characterized in that: Comprising the battery as claimed in any one of claims 1 to 11.

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