Battery, battery module and battery pack

Abstract

The utility model provides a battery, a battery module and a battery pack. The battery comprises a shell, a pole piece assembly, a pin structure and a guide structure, according to the technical scheme, the electrolyte located at the bottom end of the pole piece assembly is conveyed to the second guide piece through the first guide piece, and then the electrolyte is conveyed to the top of the pole piece assembly through the second guide piece, so that the electrolyte at the top of the pole piece assembly can be supplemented in the battery, the overall wettability of the pole piece assembly is improved, and the service life of the battery is prolonged. Therefore, the possibility of local drying of the electrolyte is reduced, and the risk of battery failure is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery, battery module and battery pack. BACKGROUND

[0002] In the related art, during the recycling process of the battery, as the number of battery recycling increases, the electrolyte inside the battery can gradually be consumed or unevenly distributed, thereby causing the phenomenon of local electrolyte drying in the battery, which in turn can cause the risk of battery capacity decline and battery failure. SUMMARY

[0003] Embodiments of the utility model provide a battery, battery module and battery pack, which can improve the phenomenon of local electrolyte drying in the battery to reduce the risk of battery failure.

[0004] In a first aspect, embodiments of the utility model provide a battery, comprising:

[0005] A shell comprising a housing and a top cover assembly, the housing has a cavity inside, and the top cover assembly is connected to the housing and covers the cavity;

[0006] A pole piece assembly is arranged in the cavity;

[0007] A pin structure is arranged in the cavity, one end of the pin structure is connected to the top cover assembly; and

[0008] A guide structure comprising a first guide and a second guide, the first guide is arranged on the inner wall of the housing forming the cavity, and the second guide is arranged on the end of the pin structure connected to the top cover assembly;

[0009] The first guide is configured to transfer the electrolyte to the second guide, and the second guide is configured to transfer the electrolyte to the pole piece assembly.

[0010] In an embodiment, the pin structure comprises a pole post connecting part, which is located between the pole piece assembly and the top cover assembly;

[0011] The second guide is arranged on the pole post connecting part.

[0012] In an embodiment, the pin structure further comprises a tab connecting part, which is arranged between the housing and the pole piece assembly and connected to the pole post connecting part, and the tab connecting part is also connected to the pole piece assembly;

[0013] The guide structure further comprises a third guide, which is arranged on the tab connecting part and communicates with the second guide;

[0014] The first guide communicates with the second guide and / or the third guide.

[0015] In an embodiment, the battery further comprises an insulation film, the insulation film is arranged between the pole piece assembly and the pin structure.

[0016] In an embodiment, the guide structure comprises a fourth guide, the fourth guide is arranged on the insulation film, and the fourth guide is configured to transport the electrolyte to the pole piece assembly.

[0017] In an embodiment, the second guide is arranged on at least one side of the pole column connecting portion in the first direction.

[0018] In an embodiment, a size of the first guide in the first direction is defined as L, and a size of the shell in the first direction is defined as L1; wherein L and L1 satisfy: 2 / 3L1≤L≤3 / 4L1.

[0019] In an embodiment, the shell comprises two first side walls and two second side walls, the two first side walls are oppositely arranged along a second direction, the two second side walls are oppositely arranged along a third direction, and the two first side walls and the two second side walls are sequentially connected in a head-to-tail manner to enclose the cavity, the first direction intersects the second direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0020] Wherein, an area of the first side wall is greater than an area of the second side wall, and the first guide is arranged on the second side wall.

[0021] In an embodiment, a size of the first guide in the second direction is defined as L3; wherein L3 satisfies: 1.3mm≤L3≤2.2mm.

[0022] In an embodiment, a plurality of convex portions are arranged on the second side wall, and the plurality of convex portions are located in the cavity.

[0023] In an embodiment, the first guide is a capillary structure; and / or

[0024] The second guide is a capillary structure.

[0025] In an embodiment, the capillary structure comprises at least one of a mesh structure and a capillary core structure.

[0026] In a second aspect, an embodiment of the utility model provides a battery, comprising:

[0027] A shell comprising a shell and a top cover assembly, the shell is provided with a cavity, and the top cover assembly is connected with the shell and covers the cavity.

[0028] A pole piece assembly arranged in the cavity.

[0029] A guide structure comprising a first guide, the first guide is arranged on the shell and located in the cavity.

[0030] A size of the first guide in the first direction is defined as L, and a size of the shell in the first direction is defined as L1; wherein the L and the L1 satisfy: 2 / 3L1≤L≤3 / 4L1.

[0031] In an embodiment, the shell comprises two first side walls and two second side walls, the two first side walls are oppositely arranged along a second direction, the two second side walls are oppositely arranged along a third direction, and the two first side walls and the two second side walls are sequentially connected in a head-to-tail manner to enclose the cavity, the second direction intersects the first direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0032] The area of the first side wall is greater than the area of the second side wall, and the first guide is arranged on the second side wall.

[0033] In an embodiment, a size of the first guide in the second direction is defined as L3; wherein the L3 satisfies: 1.3mm≤L3≤2.2mm.

[0034] In an embodiment, a plurality of convex portions are arranged on the second side wall, and the plurality of convex portions are located in the cavity.

[0035] In an embodiment, the first guide is a capillary structure.

[0036] In a third aspect, an embodiment of the utility model provides a battery module comprising a battery.

[0037] In a fourth aspect, an embodiment of the utility model provides a battery pack comprising a battery module

[0038] The embodiment of the utility model has the beneficial effects of:

[0039] In the technical scheme of the present application, the electrolyte at the bottom end of the pole piece assembly is transmitted to the second guide through the first guide, and then the electrolyte is transmitted to the top of the pole piece assembly through the second guide, thereby the electrolyte at the top of the pole piece assembly in the battery can be supplemented, the overall wettability of the pole piece assembly is improved, the possibility of local dryness of the electrolyte is reduced, and the risk of battery failure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0041] Figure 1 is an explosion schematic diagram of the battery provided by the embodiment of the utility model;

[0042] Figure 2 is a perspective view of the pin structure provided by the embodiment of the utility model;

[0043] Figure 3 is Figure 1 enlarged view of A in the middle;

[0044] Figure 4 is a perspective view of the shell provided by the embodiment of the utility model;

[0045] Figure 5 is a structural view of the second side wall provided by the embodiment of the utility model;

[0046] Figure 6 is Figure 5 enlarged view of B in the middle.

[0047] Explanation of reference signs:

[0048] 1, shell; 11, shell; 1A, cavity; 111, first side wall; 112, second side wall; 12, top cover assembly; 121, cover plate; 122, pole column; 2, pole piece assembly; 21, main body part; 22, pole lug; 3, pin structure; 31, pole column connecting part; 32, pole lug connecting part; 4, guide structure; 41, first guide; 42, second guide; 43, third guide; 44, fourth guide; 5, insulating film; 6, protruding part. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, the orientation words such as "upper" and "lower" are generally used to refer to the upper and lower of the device in the actual use or working state, and the specific direction is the direction of the drawing in the drawings. And "inner" and "outer" are used in relation to the outline of the device.

[0050] In a first aspect, the application provides a battery, Figures 1 to 6 for some embodiments of the application. As shown in the drawings, the Z direction is the first direction, the Y direction is the second direction, and the X direction is the third direction. The first direction intersects the second direction, and the third direction is perpendicular to the first direction and the second direction. Hereinafter, the first direction Z, the second direction Y and the third direction X are described and explained.

[0051] Firstly, the background of the present application is explained and described. During the cycle use of the battery, as the electrolyte is consumed, the electrolyte located at the top of the electrode assembly 2 will gradually dry up, and most of the electrolyte will accumulate at the bottom end of the electrode assembly 2, thereby causing the phenomenon of local electrolyte drying in the battery.

[0052] The top of the above-mentioned electrode assembly 2 is the end of the electrode assembly 2 close to the top cover assembly 12 in the following embodiments.

[0053] Please refer to Figures 1 to 2 In some embodiments of the present application, the battery comprises a shell 1 and an electrode assembly 2, the shell 1 comprises a shell body 11 and a top cover assembly 12, the shell body 11 is provided with a cavity 1A, and the top cover assembly 12 is connected with the shell body 11 to cover the cavity 1A, so as to seal the electrode assembly 2 located in the cavity 1A.

[0054] In some embodiments of the present application, the cavity 1A is provided with an opening in the first direction Z, that is, the top cover assembly 12 is located on one side of the shell body 11 in the first direction Z.

[0055] In some embodiments of the present application, the top cover assembly 12 comprises a cover plate 121 and a pole 122, the cover plate 121 is connected with the shell body 11 and covers the cavity 1A, and the pole 122 is located on the cover plate 121 and connected with the electrode assembly 2.

[0056] In some embodiments of the present application, the battery further comprises a pin structure 3, one end of the pin structure 3 is connected with the top cover assembly 12, and the other end of the pin structure 3 is connected with the electrode assembly 2, so as to transmit the electric energy inside the battery to an external device.

[0057] In some embodiments of the present application, the battery further comprises a guide structure 4, the guide structure 4 comprises a first guide 41 and a second guide 42, the first guide 41 is arranged on the inner wall of the shell body 11 forming the cavity 1A, and the second guide 42 is arranged on the end of the pin structure 3 connected with the top cover assembly 12; wherein the first guide 41 is configured to transmit the electrolyte to the second guide 42, and the second guide 42 is configured to transmit the electrolyte to the electrode assembly 2.

[0058] In the technical scheme of the present application, the electrolyte located at the bottom end of the electrode assembly 2 is transmitted to the second guide 42 through the first guide 41, and then the electrolyte is transmitted to the top of the electrode assembly 2 through the second guide 42, thereby the electrolyte at the top of the electrode assembly 2 in the battery can be supplemented, so as to improve the overall wettability of the electrode assembly 2, reduce the possibility of local electrolyte drying, and thereby reduce the risk of battery failure.

[0059] It can be understood that, since one end of the pin structure 3 is connected with the top cover assembly 12, and the top cover assembly 12 is located at one side of the pole piece assembly 2 in the first direction Z, the part of the pin structure 3 connected with the top cover assembly 12 is close to the end of the pole piece assembly 2 towards the top cover assembly 12, that is, close to the top end of the pole piece assembly 2, so as to deliver the electrolyte to the top end of the pole piece assembly 2.

[0060] In some embodiments of the present application, the pin structure 3 comprises a pole post connecting part 31 located between the pole piece assembly 2 and the top cover assembly 12, and the second guide 42 is arranged on the pole post connecting part 31; that is, in this embodiment, the second guide 42 is also located between the pole piece assembly 2 and the top cover assembly 12, so as to be able to deliver the electrolyte into the gap at the top of the pole piece assembly 2, so as to accelerate the infiltration speed of the electrolyte in the pole piece assembly 2.

[0061] In the present application, the type of the battery is not limited, and the battery can be a jelly-roll battery or a stacked battery; when the battery is a jelly-roll battery, the pole piece assembly 2 is formed by winding the positive pole piece and the negative pole piece with each other, so that the gap in the first direction Z is formed; when the battery is a stacked battery, the pole piece assembly 2 is formed by stacking the positive pole piece and the negative pole piece, so that the gap in the first direction Z is also formed.

[0062] In some embodiments of the present application, the first guide 41 is a capillary structure, that is, the first guide 41 can generate capillary phenomenon, so as to be able to deliver the electrolyte in the cavity 1A into the second guide 42.

[0063] In some embodiments of the present application, the first guide 41 can be directly formed on the shell 11, or can be assembled on the shell 11 as an independent component; this is not limited.

[0064] In addition, the first guide 41 is located at one side of the pole piece assembly 2 in the second direction Y or the third direction X, and the first guide 41 is further configured to deliver the electrolyte from one side of the pole piece assembly 2 in the second direction Y or the third direction X into the pole piece assembly 2.

[0065] In some embodiments of the present application, the second guide 42 is a capillary structure, that is, the second guide 42 can generate capillary phenomenon, so as to deliver the electrolyte delivered from the first guide 41 into the gap at the top of the pole piece assembly 2.

[0066] In some embodiments of the present application, the second guide 42 can be directly formed on the pole post connecting part 31, or can be assembled on the pole post connecting part 31 as an independent component; this is not limited.

[0067] In some embodiments of the present application, the first guide 41 and the second guide 42 are both capillary structures, so that the electrolyte in the cavity 1A can enter the gap on the top of the electrode assembly 2 along the extension direction of the first guide 41 and the extension direction of the second guide 42, so as to soak the electrode assembly 2.

[0068] In some embodiments of the present application, the pin structure 3 further comprises a tab connecting portion 32, which is arranged between the electrode assembly 2 and the shell 11 and connected with the pole connecting portion 31, and is also connected with the electrode assembly 2; that is, in this embodiment, the pole connecting portion 31 connects the electrode assembly 2 through the tab connecting portion 32, so as to transmit the electric energy inside the battery to the external device.

[0069] In some embodiments of the present application, the electrode assembly 2 comprises a main body portion 21 and a tab 22, which is connected with the main body portion 21 and arranged between the shell 11 and the main body portion 21; wherein the main body portion 21 comprises a positive electrode plate and a negative electrode plate. In an embodiment of the present application, the tab 22 is arranged on one side of the main body portion 21 in the second direction Y; in another embodiment of the present application, the tab 22 is arranged on one side of the main body portion 21 in the third direction X.

[0070] Wherein the tab connecting portion 32 is connected with the tab 22.

[0071] In some embodiments of the present application, the guide structure 4 comprises a third guide 43, which is arranged on the tab connecting portion 32 and communicates with the second guide 42; wherein the first guide 41 communicates with the second guide 42 and / or the third guide 43; that is, in this embodiment, the first guide 41 transmits the electrolyte in the cavity 1A to the second guide 42 and / or the third guide 43, and finally transmits the electrolyte to the gap on the top of the electrode assembly 2 through the second guide 42, so as to supplement the electrolyte on the top of the electrode assembly 2 inside the battery, thereby improving the overall wettability of the electrode assembly 2.

[0072] In some embodiments of the present application, the first guide 41 communicates with the second guide 42, so that the first guide 41 can transmit the electrolyte in the cavity 1A to the second guide 42.

[0073] In addition, in this embodiment, the third guide 43 can also transmit the electrolyte in the cavity 1A to the second guide 42.

[0074] In some embodiments of the present application, the first guide 41 communicates with the third guide 43, so that the first guide 41 can transmit the electrolyte in the cavity 1A to the third guide 43, and then transmit the electrolyte to the second guide 42 through the third guide 43.

[0075] In addition, in the embodiment, the third guide 43 can also transmit the electrolyte in the cavity 1A to the second guide 42.

[0076] In some embodiments of the present application, the first guide 41 is in communication with the second guide 42 and the third guide 43 at the same time, that is, the electrolyte flowing out of the first guide 41 has two paths, one path is that the electrolyte flows through the first guide 41 to the third guide 43 and then to the second guide 42, and the other path is that the electrolyte flows through the first guide 41 directly to the second guide 42.

[0077] In addition, in the embodiment, the third guide 43 can also transmit the electrolyte in the cavity 1A to the second guide 42.

[0078] In some embodiments of the present application, the third guide 43 is a capillary structure, that is, the third guide 43 can generate capillary phenomenon, thereby being capable of transmitting the electrolyte in the first guide 41 to the second guide 42.

[0079] In some embodiments of the present application, the third guide 43 can be directly formed on the tab connecting portion 32 or can be assembled to the tab connecting portion 32 as an independent component; this is not limited here.

[0080] In some embodiments of the present application, the pole connecting portion 31 extends along the second direction Y or the third direction X, so the second guide 42 provided on the pole connecting portion 31 also extends along the second direction Y or the third direction X, so the contact area between the second guide 42 and the shell 11 is small or there is a certain gap between the second guide 42 and the shell 11, and by providing the third guide 43 on the tab connecting portion 32 in communication with the second guide 42, because the tab connecting portion 32 extends along the first direction Z and is located between the shell 11 and the main body portion 21, the electrolyte in the first guide 41 can be conveniently transmitted to the third guide 43 on the tab connecting portion 32 and then to the second guide 42, thereby improving the overall wetting effect on the tab assembly 2.

[0081] Similarly, part of the tab connecting portion 32 can also directly contact the electrolyte in the battery, thereby enabling the electrolyte in the battery to be directly transmitted to the third guide 43, so as to improve the overall wetting effect on the tab assembly 2.

[0082] In some embodiments of the present application, the battery further comprises an insulating film 5 provided between the main body portion 21 and the pin structure 3; wherein the provision of the insulating film 5 can avoid direct contact between the pin structure 3 and the main body portion 21 causing short circuit, and the insulating film 5 is made of plastic material, thereby being capable of generating certain capillary phenomenon, thereby also being capable of transmitting the electrolyte to the gap at the top of the tab assembly 2.

[0083] Referring to Figure 1 and Figure 3 In some embodiments of the present application, the guide structure 4 further comprises a fourth guide 44 disposed on the insulating film 5; the fourth guide 44 is configured to transport electrolyte into the gap on one side of the electrode assembly 2 in the first direction Z. In one embodiment, the insulating film 5 can be directly in contact with the electrolyte, so that the electrolyte in the battery can be directly transported from the fourth guide 44 into the gap on the top of the electrode assembly 2; in another embodiment, the electrolyte in the first guide 41 or the third guide 43 can be transported into the fourth guide 44, so that the electrolyte can be transported from the fourth guide 44 into the gap on the top of the electrode assembly 2.

[0084] It should be noted that the insulating film 5 is provided for the insulating pin structure 3 and the main body 21, so at least part of the insulating film 5 is disposed between the pole connecting portion 31 and the main body 21; and at least part of the fourth guide 44 disposed on the insulating film 5 can be disposed between the pole connecting portion 31 and the main body 21, so as to transport the electrolyte into the gap on the top of the electrode assembly 2.

[0085] In some embodiments of the present application, the second guide 42 is disposed on at least one side of the pole connecting portion 31 in the first direction Z; that is, in this embodiment, the position of the second guide 42 is not limited, as long as the second guide 42 is located on one side of the electrode assembly 2 in the first direction Z.

[0086] In one embodiment of the present application, the second guide 42 is disposed on the side of the pole connecting portion 31 in the first direction Z close to the main body 21, and the third guide 43 is disposed on the side of the tab connecting portion 32 close to the main body 21, so that the second guide 42 and the third guide 43 can be communicated.

[0087] Referring to Figure 2 In another embodiment of the present application, the second guide 42 is disposed on the side of the pole connecting portion 31 in the first direction Z away from the main body 21, and the third guide 43 is disposed on the side of the tab connecting portion 32 away from the main body 21, so that the second guide 42 and the third guide 43 can be communicated.

[0088] In yet another embodiment of the present application, the second guide 42 is disposed on both sides of the pole connecting portion 31 in the first direction Z, and the third guide 43 is disposed on both sides of the tab connecting portion close to and away from the main body 21.

[0089] Referring to Figures 4 to 5In some embodiments of the present application, the first guide 41 has a size L in the first direction Z, and the shell 11 has a size L1 in the first direction Z; wherein L and L1 satisfy: 2 / 3L1≤L≤3 / 4L1; in this embodiment, L and L1 are set to satisfy this interval range, so that the setting position of the first guide 41 can be opposite to the position of the pin structure 3 in the battery in the first direction Z, so that the first guide 41 can transmit the electrolyte to the second guide 42 on the pin structure 3, and also so that the first guide 41 can directly transmit the electrolyte to the top of the electrode assembly 2.

[0090] If L is less than 2 / 3L1, there may be a risk that the first guide 41 cannot transmit the electrolyte to the top of the electrode assembly 2 and cannot transmit the electrolyte to the second guide 42, and if L is greater than 3 / 4L1, part of the first guide 41 in the first direction Z exceeds the height of the pin structure 3 in the first direction Z, and part of the electrolyte is located in the part of the first guide 41 in the first direction Z that exceeds the pin structure 3, so that the electrolyte is wasted during transmission.

[0091] In addition, designing L and L1 to satisfy the interval range of 2 / 3L1≤L≤3 / 4L1 can also enable the electrode assembly 2 to transmit the electrolyte to the top of the electrode assembly 2 in the first direction Z.

[0092] In some embodiments of the present application, the shell 11 includes two first side walls 111 and two second side walls 112, the two first side walls 111 are oppositely arranged along the second direction Y, and the two second side walls 112 are oppositely arranged along the third direction X; the two first side walls 111 and the two second side walls 112 are sequentially connected end to end to enclose the cavity 1A; wherein the area of the first side wall 111 is greater than the area of the second side wall 112, and the first guide 41 is arranged on the second side wall 112; in this embodiment, the electrode assembly 2 is located in the cavity 1A, and the expansion direction of the electrode assembly is towards the second direction Y, and the first guide 41 is arranged on the second side wall 112 to avoid the expansion of the electrode assembly 2 pressing the first guide 41, so as to affect the transmission effect of the electrolyte of the first guide 41.

[0093] Please refer to Figure 6 In some embodiments of the present application, the first guide 41 has a size L3 in the second direction Y; wherein L3 satisfies: 1.3mm≤L3≤2.2mm. Setting L3 to satisfy this interval range enables the first guide 41 to have a capillary effect, thereby being able to draw electrolyte from the cavity 1A and transmit the electrolyte to the electrode assembly 2.

[0094] If L3 is less than 1.3 mm, it will be difficult for the electrolyte to be transmitted in the first guide 41. If L3 is greater than 2.2 mm, it will result in poor capillary effect of the first guide 41 or the first guide 41 will not have a capillary effect.

[0095] Please see Figure 5 In some embodiments of this application, a plurality of protrusions 6 are provided on the second sidewall 112, and the plurality of protrusions 6 are all located in the cavity 1A; by providing the protrusions 6, the electrode assembly 2 is prevented from squeezing the first guide 41 inside the battery, so as to affect the electrolyte transmission effect of the first guide 41.

[0096] In some embodiments of this application, the first guide 41 is a capillary structure and includes at least one of a mesh structure and a capillary core structure.

[0097] In some embodiments of this application, the side of the second sidewall 112 facing the cavity 1A is pulverized to control the roughness of the side of the second sidewall 112 facing the cavity 1A to be between 4 and 16, so that the first guide 41 can better fit with the second sidewall 112, and at the same time improve the aggregation effect of the electrolyte on the second sidewall 112.

[0098] In some embodiments of this application, the second guide 42 is a capillary structure and includes at least one of a mesh structure and a capillary core structure.

[0099] In some embodiments of this application, the third guide 43 is a capillary structure and includes at least one of a mesh structure and a capillary core structure.

[0100] In some embodiments of this application, the fourth guide 44 is a capillary structure and includes at least one of a mesh structure and a capillary core structure.

[0101] Secondly, this application proposes a battery, which includes a housing 1 and an electrode assembly 2. The housing 1 includes a shell 11 and a top cover assembly 12. A cavity 1A is provided inside the shell 11. The top cover assembly 12 is connected to the shell 11 and covers the cavity 1A to seal the electrode assembly 2 located in the cavity 1A.

[0102] In some embodiments of this application, the cavity 1A is provided as an opening in the first direction Z, that is, the top cover assembly 12 is located on one side of the housing 11 in the first direction Z.

[0103] In some embodiments of the present application, the battery further comprises a guide structure 4, the guide structure comprising a first guide 41, the first guide 41 being arranged on the shell 11 and located in the cavity 1A; a size of the first guide in the first direction is defined as L, a size of the shell in the first direction is defined as L1; wherein the L and the L1 satisfy: 2 / 3L1≤L≤3 / 4L1; in this embodiment, the L and the L1 are arranged in this interval range, so that the jelly roll assembly 2 can transmit the electrolyte to the top of the jelly roll assembly 2 in the first direction Z.

[0104] If the L is less than 2 / 3L1, there is a risk that the first guide 41 cannot transmit the electrolyte to the top of the jelly roll assembly 2, and if the L is greater than 3 / 4L1, part of the first guide 41 in the first direction Z exceeds the height of the jelly roll assembly 2 in the first direction Z, and part of the electrolyte is located in the part of the first guide 41 in the first direction Z that exceeds the jelly roll assembly 2, so that the electrolyte is wasted during transmission.

[0105] In some embodiments of the present application, the shell 11 comprises two first side walls 111 and two second side walls 112, the two first side walls 111 being oppositely arranged along the second direction Y, and the two second side walls 112 being oppositely arranged along the third direction X, the two first side walls 111 and the two second side walls 112 being sequentially connected end to end to enclose the cavity 1A; wherein the area of the first side wall 111 is greater than the area of the second side wall 112, and the first guide 41 is arranged on the second side wall 112; in this embodiment, the jelly roll assembly 2 is located in the cavity 1A, and the expansion direction of the jelly roll assembly is towards the second direction Y, and the first guide 41 is arranged on the second side wall 112 to avoid the expansion of the jelly roll assembly 2 pressing the first guide 41, so as to affect the transmission effect of the electrolyte of the first guide 41.

[0106] Please refer to Figure 6 In some embodiments of the present application, a size of the first guide 41 in the second direction Y is defined as L3; wherein the L3 satisfies: 1.3mm≤L3≤2.2mm. The L3 is arranged in this interval range, so that the first guide 41 has a capillary effect, thereby being able to draw the electrolyte from the cavity 1A and transmit the electrolyte to the jelly roll assembly 2.

[0107] If the L3 is less than 1.3mm, it is not easy for the electrolyte to be transmitted in the first guide 41, and if the L3 is greater than 2.2mm, the capillary effect of the first guide 41 is poor or the first guide 41 does not have a capillary effect.

[0108] In some embodiments of the present application, a plurality of protrusions 6 are arranged on the second side wall 112, and each of the plurality of protrusions 6 is located in the cavity 1A; by arranging the protrusions 6, the pole piece assembly 2 can be prevented from pressing the first guide 41 in the battery, so as to affect the transmission effect of the electrolyte of the first guide 41.

[0109] In some embodiments of the present application, the first guide 41 is a capillary structure and includes at least one of a mesh structure and a capillary core structure.

[0110] In a third aspect, the present application further provides a battery module, the battery module including a battery, and the battery is as described above. Since the battery module adopts all the technical solutions of all the embodiments described above, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0111] In a fourth aspect, the present application further provides a battery pack, the battery pack including a battery module, and the battery module is as described above. Since the battery pack adopts all the technical solutions of all the embodiments described above, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0112] The above has carried out the detailed introduction to the embodiment of the present application, the principle and implementation mode of the present application have been described in this paper by applying specific examples, the above embodiment is only used for helping to understand the method of the present application and its core idea; At the same time, for the person skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A battery, characterized by, The battery comprises: a shell comprising a shell body and a top cover assembly, the shell body being provided with a cavity, the top cover assembly being connected with the shell body and covering the cavity; a tab assembly arranged in the cavity; a pin structure arranged in the cavity, one end of the pin structure being connected with the top cover assembly; and a guide structure comprising a first guide member and a second guide member, the first guide member being arranged on an inner wall of the shell body forming the cavity, and the second guide member being arranged on one end of the pin structure connected with the top cover assembly; wherein the first guide member is configured to transmit electrolyte to the second guide member, and the second guide member is configured to transmit electrolyte to the tab assembly. The pin structure comprises a pole post connecting portion located between the tab assembly and the top cover assembly; 2. The battery of claim 1, wherein, wherein the second guide member is arranged on the pole post connecting portion. The pin structure further comprises a tab connecting portion arranged between the shell body and the tab assembly and connected with the pole post connecting portion, and the tab connecting portion is further connected with the tab assembly; 3. The battery of claim 2, wherein, the guide structure further comprises a third guide member arranged on the tab connecting portion and in communication with the second guide member; wherein the first guide member is in communication with the second guide member and / or the third guide member. The battery further comprises an insulating film arranged between the tab assembly and the pin structure.

4. The battery of claim 1, wherein, The guide structure comprises a fourth guide member arranged on the insulating film, and the fourth guide member is configured to transmit electrolyte to the tab assembly.

5. The battery of claim 4, wherein, The second guide member is arranged on at least one side of the pole post connecting portion in a first direction.

6. The battery of claim 2, wherein, The size of the first guide member in the first direction is defined as L, and the size of the shell body in the first direction is defined as L1; wherein the L and the L1 satisfy: 2 / 3L1≤L≤3 / 4L1.

7. The battery according to any one of claims 1 to 6, characterized in that, The shell comprises two first side walls and two second side walls, the two first side walls being oppositely arranged along a second direction, and the two second side walls being oppositely arranged along a third direction, the two first side walls and the two second side walls being sequentially connected end to end to enclose the cavity, the second direction intersecting the first direction, and the third direction being perpendicular to the first direction and the second direction; 8. The battery according to any one of claims 1 to 6, characterized in that wherein the area of the first side wall is greater than the area of the second side wall, and the first guide member is arranged on the second side wall. The size of the first guide member in the second direction is defined as L3; wherein the L3 satisfies: 1.3mm≤L3≤2.2mm.

9. The battery of claim 8, wherein, The second side wall is provided with a plurality of convex portions, and the plurality of convex portions are located in the cavity.

10. The battery of claim 8, wherein, The first guide member is a capillary structure; and / or 11. The battery according to any one of claims 1 to 6, characterized in that, The second guide member is a capillary structure. The capillary structure comprises at least one of a mesh structure and a capillary core structure.

12. The battery of claim 11, wherein, The battery comprises:

13. A battery, characterized by a shell comprising a shell body and a top cover assembly, the shell body being provided with a cavity, the top cover assembly being connected with the shell body and covering the cavity; a tab assembly arranged in the cavity; ​ The guide structure comprises a first guide element arranged on the shell and located in the cavity; The size of the first guide element in the first direction is defined as L, and the size of the shell in the first direction is defined as L1; wherein the L and the L1 satisfy: 2 / 3L1≤L≤3 / 4L1.

14. The battery of claim 13, wherein, The shell comprises two first side walls and two second side walls, the two first side walls are oppositely arranged along a second direction, the two second side walls are oppositely arranged along a third direction, and the two first side walls and the two second side walls are sequentially connected in a head-to-tail manner to form the cavity, the first direction intersects the second direction, and the third direction is perpendicular to the first direction and the second direction respectively; The area of the first side wall is greater than the area of the second side wall, and the first guide element is arranged on the second side wall.

15. The battery of claim 14, wherein, The size of the first guide element in the second direction is defined as L3; wherein the L3 satisfies: 1.3mm≤L3≤2.2mm.

16. The battery of claim 14, wherein, A plurality of convex portions are arranged on the second side wall, and the plurality of convex portions are located in the cavity.

17. The battery of any one of claims 13 to 16, wherein, The first guide element is a capillary structure.

18. A battery module, comprising: The battery comprises the battery as claimed in any one of claims 1 to 17.

19. A battery pack, characterized by The battery module comprises the battery as claimed in claim 18.

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