Battery and battery module

Abstract

The utility model provides a battery and a battery module, the battery comprises a battery cell, an electrolyte and a battery shell, the battery cell comprises a main body part, the battery shell comprises a first scouring pit and a second scouring pit, the first scouring pit accommodates the main body part and accommodates at least part of the electrolyte, the second scouring pit does not accommodate the main body part, and the second scouring pit does not accommodate at least part of the electrolyte. The first scouring pit is arranged in the main body part and contains at least part of the electrolyte, so that in the production and use process of the battery cell, the main body part is extruded, the electrolyte stored in the first scouring pit can be extruded to the position outside the first scouring pit, and the second scouring pit can exactly contain the part of the extruded electrolyte, so that the gathering amount of the electrolyte can be reduced, and the production efficiency is improved. And the impact of the extruded electrolyte on the battery shell is buffered and even avoided, so that the battery shell can be prevented from being damaged, the risk of short circuit is reduced, and the possible deformation of the battery shell can also be avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and a battery module. Background Art

[0002] Soft-pack batteries are widely used in digital products such as mobile phones, wearable electronics, and laptops, as well as power tools and electric vehicles, due to their advantages such as good safety, light weight, large capacity, and flexible design. As a key component of the battery, the packaging shell of the soft-pack battery has a significant impact on the battery's size.

[0003] Since the outer shell of a soft-pack battery is usually a film layer that is easily deformed, during the production and use of the battery cell, the electrolyte may accumulate in the top seal area. The accumulated electrolyte may have a strong impact on the outer shell, which can easily cause damage, deformation or other adverse consequences to the outer shell. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a battery and a battery module to solve or partially solve the problems raised in the background art.

[0005] Based on the above-mentioned purpose, the first aspect of the present application provides a battery, comprising: a battery cell, an electrolyte and a battery shell, wherein the battery cell includes a main body, and the battery shell includes a first pit and a second pit, wherein the first pit accommodates the main body and accommodates at least part of the electrolyte, and the second pit does not accommodate the main body and accommodates at least part of the electrolyte.

[0006] In this way, during the production and use of the battery cell, the electrolyte stored in the first pit may be squeezed to a position outside the first pit due to the squeezing of the main body. The setting of the second pit can just accommodate this part of the squeezed electrolyte, which can reduce the amount of electrolyte accumulation, buffer or even avoid the impact of the squeezed electrolyte on the battery shell, thereby avoiding damage to the battery shell, reducing the risk of short circuit, and avoiding possible deformation of the battery shell.

[0007] Optionally, the battery housing further includes a transition portion, and the transition portion is located between the first pit and the second pit.

[0008] In actual use of the battery, if the ends of the first pit and the second pit are directly connected, stress concentration may occur at the connection position, resulting in possible damage to the stress-concentrated portion when subjected to pressure.

[0009] Therefore, in the present application, a transition portion is provided between the first pit and the second pit. The presence of the transition portion can avoid direct connection between the first pit and the second pit, thereby reducing stress concentration between the two pits. This can avoid damage to the first pit, the second pit or the transition portion when subjected to pressure, thereby improving the safety of the battery.

[0010] In addition, during the production of the battery, if the ends of the first pit and the second pit are directly connected, the battery shell may be damaged when the first pit and the second pit are made because the two pits are very close to each other.

[0011] Therefore, the present application increases the distance between the first pit and the second pit by setting a transition portion between the first pit and the second pit, avoiding damage or deformation of the battery shell when making the first pit and the second pit, and reducing the difficulty of production.

[0012] Optionally, the transition portion and the first punching hole meet the condition: 5L≤H 2 / M≤150L, wherein H is the distance between the most convex position of the first pit and the plane where the most concave position of the transition portion is located, M is the thickness of the transition portion, and L is the length of the transition portion.

[0013] H 2 / M is the ratio of the depth of the first pit to the thickness of the transition portion. During the battery production process, the deeper the pit, the more severe the transition portion will be stretched during the pitting, resulting in a thinner thickness of the transition portion. If the thickness of the transition portion is too thin, the structural strength of the transition portion will be insufficient.

[0014] Therefore, in this application, control 5L≤H 2 / M≤150L, which can ensure that the depth of the punching pit and the thickness of the transition part are kept in an appropriate ratio, and can maintain the structural strength of the transition part while ensuring that the pit depth is sufficient to accommodate the main body and the electrolyte.

[0015] Optionally, 1mm≤H≤6mm, 0.05mm≤M≤0.16mm, 0.4mm≤L≤1.5mm.

[0016] 1mm≤H≤6mm. The lower limit ensures that the depth of the first pit is sufficient to effectively form a space for the main body and electrolyte, and the upper limit ensures that the setting of the first pit does not affect the position of the battery tab on the main body. If H is less than 1mm, the depth of the first pit is insufficient to effectively accommodate the main body and electrolyte. If H is greater than 6mm, the depth of the first pit is too deep and affects the position of the battery tab on the main body.

[0017] 0.05mm≤M≤0.16mm, the lower limit can ensure the mechanical strength of the transition part, and the upper limit can ensure the forming effect of the punching machining. If M<0.05mm, the mechanical strength of the transition part is insufficient; if M>0.16mm, the thickness of the transition part is too thick, affecting the forming effect of the punching machining.

[0018] 0.4mm≤L≤1.5mm can ensure the appropriate length of the transition portion. The lower limit can effectively reduce the stress between the two pits, and the upper limit can ensure that the setting of the transition portion does not affect the battery capacity. If L is less than 0.4mm, the length of the transition portion is too short and cannot effectively reduce the stress between the two pits. If L is greater than 1.5mm, the length of the transition portion is too long, which will compress the battery capacity.

[0019] Optionally, the distance between the plane where the most convex position of the first pit and the most concave position of the transition portion are located is greater than or equal to the distance between the plane where the most convex position of the second pit and the most concave position of the transition portion are located.

[0020] In this way, the depth of the second pit is less than or equal to the depth of the first pit, which not only allows the second pit to accommodate the electrolyte squeezed out of the first pit, but also ensures that the setting of the second pit does not increase the overall thickness of the battery shell.

[0021] Furthermore, the depth of the second pit will not affect the configuration between batteries, thereby not affecting the convenience of setting up the battery module, nor affecting the capacity space of the battery module.

[0022] Optionally, the first pit includes a first bottom surface, the second pit includes a second bottom surface, the transition portion, the first bottom surface and the second bottom surface are parallel, and the distance between the first bottom surface and the plane where the transition portion is located is less than or equal to the distance between the second bottom surface and the plane where the transition portion is located.

[0023] The transition portion, the first bottom surface and the second bottom surface are parallel, so that when the batteries are assembled into a module, the fit between the batteries is better, thereby increasing the overall capacity of the module.

[0024] Optionally, the battery further includes an electrode, and the battery cell further includes a tab extending outward from the top surface of the main body, the tab includes a welding area, the welding area is welded to the electrode, the orthographic projection of the welding area on the first plane does not coincide with the orthographic projection of the second pit on the first plane, and the first plane is the plane where the welding area is located.

[0025] In this way, the welding area is set closer to the upper part of the battery shell, so that the distance between the welding area and the battery shell in the thickness direction is shorter, which can ensure that during battery production and use, the battery shell provides certain protection and constraints to the welding area, so that the welding area has better stability in the thickness direction.

[0026] Optionally, the side of the first pit close to the second pit is a first connecting portion, the first connecting portion includes a first end and a second end, the side of the second pit close to the first pit is a second connecting portion, the second connecting portion includes a third end and a fourth end, the first end and the third end are connected, and there is a gap between the second end and the fourth end.

[0027] The first end and the third end are connected, that is, the distance between the first end and the third end is zero. In this way, during the production and use of the battery cell, the electrolyte squeezed out from the first punching hole can immediately enter the second punching hole, which can almost completely avoid the impact of the squeezed electrolyte on the battery casing.

[0028] A gap is formed between the second end and the fourth end, creating a gap between the first and second pits. This gap provides space for deformation of the first and second pits. When the electrolyte squeezed out of the first pit is squeezed into the second pit, it may cause slight deformation of the second pit. This gap provides a buffer for this slight deformation of the second pit, preventing the outer wall of the second pit from interfering with the outer wall of the first pit.

[0029] Optionally, the second punching hole is located on a side of the first punching hole close to the top surface of the main body, and / or is located on a side of the first punching hole close to the bottom surface of the main body.

[0030] The second punching pit and the first punching pit are arranged in a diversified manner, which can improve the flexibility of the preparation process and facilitate the actual preparation process while ensuring that the second punching pit can accommodate the electrolyte squeezed out during the production and use of the battery cell.

[0031] Optionally, the first pit includes two pit side walls arranged opposite to each other, and the second pit is provided on a side of at least one of the pit side walls away from the first pit.

[0032] The second pit is set on at least one side of the first pit. In this way, during the production and use of the battery cell, the electrolyte stored in the first pit will be squeezed to a position outside the first pit due to the squeezing of the main body. The setting of the second pit can just accommodate this part of the squeezed electrolyte, which can reduce the amount of electrolyte accumulation, buffer or even avoid the impact of the squeezed electrolyte on the battery shell, thereby avoiding damage to the battery shell and reducing the risk of ion short circuit.

[0033] Optionally, the battery housing includes two half-shells arranged opposite to each other, and at least one of the half-shells is provided with the first pit and the second pit.

[0034] The positions of the first and second pits are diversified, which can ensure that the second pit can accommodate the electrolyte squeezed out during the production and use of the battery cell, and can also flexibly adjust the positions of the first and second pits based on actual needs.

[0035] Optionally, the battery housing includes two half-shells arranged opposite to each other, one of the half-shells is provided with the first pit and the second pit, and the other half-shell is provided with the first pit.

[0036] A first pit is provided on each of the two half shells, and the two first pits together accommodate the main body, so that a larger main body can be accommodated, which is beneficial to improving the volume energy density of the battery.

[0037] A second aspect of the present application provides a battery module, comprising the battery described in any one of the first aspects above.

[0038] As can be seen from the above, the battery and battery module provided by the present application, the battery includes a battery cell, an electrolyte and a battery shell, the battery cell includes a main body, the battery shell includes a first pit and a second pit, the first pit accommodates the main body and part of the electrolyte, the second pit does not accommodate the main body, and accommodates part of the electrolyte, so that during the production and use of the battery cell, the electrolyte stored in the first pit may be squeezed to a position outside the first pit due to the squeezing of the main body, and the setting of the second pit can just accommodate this part of the squeezed electrolyte, so that the amount of electrolyte accumulation can be reduced, and the impact of the squeezed electrolyte on the battery shell can be buffered or even avoided, thereby avoiding damage to the battery shell, reducing the risk of short circuit, and avoiding possible deformation of the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1a This is an exemplary front view of a conventional soft-pack battery;

[0041] Figure 1b This is an exemplary front view of an existing soft-pack battery during the production and use of the battery cell;

[0042] Figure 1c The figure is an exemplary cross-sectional diagram of an existing soft-pack battery during the production and use of the battery cell;

[0043] Figure 2 A schematic diagram of the first structure of a battery provided in an embodiment of the present application;

[0044] Figure 3 A first front view of a battery provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of the second structure of the battery provided in an embodiment of the present application;

[0046] Figure 5 A third structural schematic diagram of a battery provided in an embodiment of the present application;

[0047] Figure 6 A fourth structural schematic diagram of a battery provided in an embodiment of the present application;

[0048] Figure 7 A fifth structural diagram of a battery provided in an embodiment of the present application;

[0049] Figure 8 A second front view of the battery provided in an embodiment of the present application;

[0050] Figure 9 A third front view of the battery provided in an embodiment of the present application;

[0051] Figure 10 A sixth structural diagram of a battery provided in an embodiment of the present application;

[0052] Figure 11 This is a schematic diagram of the seventh structure of the battery provided in an embodiment of the present application.

[0053] In the figure: 01, shell; 011, crater; 012, stress concentration area;

[0054] 1. Battery cell; 11. Main body; 12. Tab; 121. Welding area; 2. Battery case; 21. First pit; 211. First bottom surface; 212. First connecting portion; 2121. First end; 2122. Second end; 213. Pit sidewall; 22. Second pit; 221. Second bottom surface; 222. Second connecting portion; 2221. Third end; 2222. Fourth end; 23. Transition portion; 24. Half shell; 3. Electrode; 4. Insulating connecting portion;

[0055] H1, the horizontal distance between the first bottom surface and the plane where the transition portion is located; H2, the horizontal distance between the second bottom surface and the plane where the transition portion is located; L, the length of the transition portion. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0057] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0058] Unlike primary batteries, secondary batteries are being widely researched and developed recently due to their rechargeability and potential in large capacity and small size. As technology develops and demand for mobile devices increases, demand for secondary batteries as their power source is also rapidly increasing.

[0059] Based on the shape of the battery casing, secondary batteries are categorized as prismatic, cylindrical, and pouch-type. Secondary batteries contain an electrode assembly and electrolyte. The electrode assembly, housed within the battery casing, is a rechargeable and dischargeable power-generating element consisting of a stacked or wound structure of electrode sheets and a separator.

[0060] The outer shell of a soft-pack battery is typically made of a deformable film, such as aluminum-plastic film. This film typically has a three-layer structure, with the inner and outer layers being organic films and the middle layer being a metal film. When a single-sided dented outer shell is used for assembly, the non-dented side is folded back and top and side seals are performed.

[0061] Figure 1a This is an exemplary front view of an existing soft pack battery. Figure 1b This is an exemplary front view of an existing soft-pack battery during the production and use of the battery cell. Figure 1c This is an exemplary cross-sectional diagram of an existing soft-pack battery during the production and use of the battery cell.

[0062] like Figure 1a 、 Figure 1b and Figure 1cAs shown, during the production and use of the battery cell, the electrolyte is squeezed out and gathered in the top seal area. The gathered electrolyte exerts a strong impact on the shell 01, resulting in a large stress at the junction of the sealed area and the unsealed area of the shell 01, forming a stress concentration area 012. Such impact of the electrolyte can easily cause damage to the inner layer of this part of the shell 01, causing the electrolyte to contact the middle metal film layer of the aluminum-plastic film, forming an ion short circuit, thereby increasing the risk of corrosion, and in severe cases, even the risk of leakage.

[0063] Therefore, there is an urgent need to provide a new shell structure to solve the problem that the electrolyte squeezed out during the production and use of the battery cell causes a large impact on the battery shell.

[0064] Based on this, the first aspect of the present application provides a battery. Figure 2 This is a schematic diagram of the first structure of the battery provided in the embodiment of the present application. Figure 3 This is a first front view of the battery provided in an embodiment of the present application.

[0065] See also Figure 2 and Figure 3 As shown, the battery includes: a battery cell 1, an electrolyte and a battery shell 2, the battery cell 1 includes a main body 11, the battery shell 2 includes a first pit 21 and a second pit 22, the first pit 21 is used to accommodate the main body 11 and part of the electrolyte, and the second pit 22 does not accommodate the main body 11, but accommodates part of the electrolyte.

[0066] Specifically, the main body 11 is formed by stacking or winding a positive electrode sheet, a separator, and a negative electrode sheet.

[0067] The battery housing 2 may be an aluminum-plastic film and includes a first recess 21 and a second recess 22 . The first recess 21 accommodates the main body 11 and part of the electrolyte, while the second recess 22 does not accommodate the main body 11 but accommodates part of the electrolyte.

[0068] There can be one or two first pits 21 , that is, the battery can have a single-sided pit or a double-sided pit.

[0069] The number of second pits 22 is the same as the number of first pits 21. When one first pit 21 is provided, one second pit 22 is also provided, and the first pit 21 and the second pit 22 are provided on the same side of the battery housing 2. When two second pits 22 are provided and are respectively provided on two side walls of the battery housing 2, two second pits 22 are also provided and are respectively provided on two side walls of the battery housing 2. In this way, the first pit 21 and the second pit 22 are provided on the same side of the battery housing 2, making the side wall of the entire battery housing 2 more neat and convenient for subsequent stacking of multiple batteries.

[0070] The cross-sectional shapes of the first punching pit 21 and the second punching pit 22 can be a trapezoidal structure, an arc structure, a square structure, a rectangular structure, etc., which are not limited here and are set according to actual needs.

[0071] In practice, when assembling the battery, the main body 11 of the battery cell 1 is placed in the first recess 21 of the battery case 2, and the battery case 2 is flipped over along the fold line to cover the battery cell 1. Then, the side and top edges of the battery case 2 are sealed.

[0072] In the present application, not only is a first recess 21 provided on the battery housing 2 for accommodating the main body 11 of the battery cell 1, but a second recess 22 for accommodating the electrolyte is also provided on the battery housing 2. During the production and use of the battery cell 1, due to the compression of the main body 11, the electrolyte stored in the first recess 21 will be squeezed to a position outside the first recess 21. The provision of the second recess 22 is just enough to accommodate this squeezed-out electrolyte, thereby reducing the amount of electrolyte accumulation, cushioning or even preventing the impact of this squeezed-out electrolyte on the battery housing 2, thereby preventing damage to the battery housing 2, reducing the risk of short circuits, and preventing possible deformation of the battery housing 2.

[0073] Figure 4 A second structural schematic diagram of the battery housing 2 according to an embodiment of the present application is shown.

[0074] In some embodiments, see Figure 4 As shown, the battery housing 2 further includes a transition portion 23 , which is located between the first dent 21 and the second dent 22 .

[0075] Specifically, in actual use of the battery, if the ends of the first pit 21 and the second pit 22 are directly connected, stress concentration may occur at the connection position, resulting in possible damage to the stress-concentrated portion when subjected to pressure.

[0076] Therefore, in the present application, a transition portion 23 is provided between the first pit 21 and the second pit 22. The presence of the transition portion 23 can avoid direct connection between the first pit 21 and the second pit 22, thereby reducing stress concentration between the two pits. In this way, damage to the first pit 21, the second pit 22 or the transition portion 23 when subjected to pressure can be avoided, thereby improving the safety of the battery.

[0077] In addition, during the production of the battery, if the ends of the first pit 21 and the second pit 22 are directly connected, the battery housing 2 may be damaged when the first pit 21 and the second pit 22 are made because the two pits are very close to each other.

[0078] Therefore, the present application increases the distance between the first pit 21 and the second pit 22 by setting a transition portion 23 between the first pit 21 and the second pit 22, thereby avoiding damage or deformation of the battery shell 2 when making the first pit 21 and the second pit 22, and reducing the difficulty of production.

[0079] In some embodiments, each corner or vertex of the first pit 21 and the second pit 22 forms a chamfered structure or a rounded structure; the position where the first pit 21 and the second pit 22 are connected to the transition portion 23, or the position where the first pit 21 and the second pit 22 are directly connected, forms a chamfered structure or a rounded structure, so that stress concentration is not likely to occur when the pressure inside the battery housing 2 increases.

[0080] Figure 5 A third structural schematic diagram of the battery housing 2 according to an embodiment of the present application is shown.

[0081] In some embodiments, the transition portion 23 and the first crater 21 satisfy the condition: 5L≤H 2 / M≤150L, wherein H is the distance between the most convex position of the first punching pit 21 and the plane where the most concave position of the transition portion is located, M is the thickness of the transition portion 23, and L is the length of the transition portion 23.

[0082] Specifically, the plane refers to the most convex position or the plane where the most convex position is located, which is perpendicular to the thickness direction of the main body 11 of the battery cell 1, and the thickness direction refers to the stacking direction of the positive electrode, separator and negative electrode in the main body 11.

[0083] H 2 / M is the ratio of the pit depth of the first punching pit 21 to the thickness of the transition portion 23. During the battery production process, the deeper the pit depth, the more severe the transition portion 23 will be stretched during punching, causing the thickness of the transition portion 23 to become thinner. If the thickness of the transition portion 23 is too thin, the structural strength of the transition portion 23 will be insufficient.

[0084] Therefore, in this application, control 5L≤H 2 / M≤150L, which can ensure that the depth of the punching pit and the thickness of the transition portion 23 are kept in an appropriate ratio, and can maintain the structural strength of the transition portion 23 while ensuring that the pit depth is sufficient to accommodate the main body 22 and the electrolyte.

[0085] Here, H is used to represent the pit depth of the first pit 21. However, since the bottom surface of the first pit 21 is not necessarily a plane, and the surface of the transition portion 23 near the first pit 21 is not necessarily a plane, the pit depths at different locations of the first pit 21 are different.

[0086] like Figure 5 As shown, in this application, H is the most convex position of the first punching pit 21 (i.e. Figure 5 The position shown in B in FIG) and the most concave position of the transition portion 23 (ie Figure 5 The distance between the planes where the position shown by A in the figure is located, that is, H is the deepest pit depth among the different pit depths at different positions of the first punching pit 21. In this way, the length of the transition portion 23 obtained based on the deepest pit depth is the most appropriate, which can ensure that the length of the transition portion 23 is sufficient and ensure that the transition portion 23 will not be torn and damaged due to the punching pit or broken when impacted by the electrolyte.

[0087] M is the thickness of the transition portion 23. Generally, the thickness of the transition portion 23 is equal to the thickness of the battery housing 2. The thicker the transition portion 23 is, the stronger the impact resistance of the transition portion 23 is.

[0088] In the present application, by controlling the ratio of the pit depth of the first punching pit 21 to the thickness of the transition portion 23, it is possible to ensure that the depth of the punching pit and the thickness of the transition portion 23 are maintained in an appropriate ratio, thereby maintaining the structural strength of the transition portion 23 while ensuring that the pit depth is sufficient to accommodate the main body 11 and the electrolyte.

[0089] In some embodiments, 1 mm ≤ H ≤ 6 mm, 0.05 mm ≤ M ≤ 0.16 mm, and 0.4 mm ≤ L ≤ 1.5 mm.

[0090] Specifically, 1mm≤H≤6mm. The lower limit ensures that the depth of the first pit 21 is sufficient to effectively form a space for accommodating the main body 11 and the electrolyte, and the upper limit ensures that the arrangement of the first pit 21 does not affect the position of the battery tab on the main body 11. If H is less than 1mm, the depth of the first pit 21 is insufficient to effectively accommodate the main body 11 and the electrolyte. If H is greater than 6mm, the depth of the first pit 21 is too deep, affecting the position of the battery tab on the main body 11.

[0091] 0.05mm≤M≤0.16mm. The lower limit can ensure the mechanical strength of the transition portion 23, and the upper limit can ensure the forming effect of the punching machining. If M is less than 0.05mm, the mechanical strength of the transition portion 23 is insufficient; if M is greater than 0.16mm, the thickness of the transition portion 23 is too thick, affecting the forming effect of the punching machining.

[0092] 0.4mm≤L≤1.5mm can ensure that the length of the transition portion 23 is appropriate. The lower limit can effectively reduce the stress between the two pits, and the upper limit can ensure that the setting of the transition portion 23 does not affect the battery capacity. If L is less than 0.4mm, the length of the transition portion 23 is too short and cannot effectively reduce the stress between the two pits. If L is greater than 1.5mm, the length of the transition portion 23 is too long, which will compress the battery capacity.

[0093] In this application, by controlling the pit depth, thickness and length of the transition portion 23, it can be ensured that the transition portion 23 can not only effectively buffer the impact force of the electrolyte, but also avoid the transition portion 23 being damaged by excessive impact of the electrolyte.

[0094] In some embodiments, see Figure 5 The distance between the most convex position of the first punching pit 21 and the plane where the most concave position of the transition part 23 is located is greater than or equal to the distance between the most convex position of the second punching pit 22 and the plane where the most concave position of the transition part 23 is located.

[0095] Specifically, the plane refers to the most convex position or the plane where the most convex position is located, which is perpendicular to the thickness direction of the main body 11 of the battery cell 1, and the thickness direction refers to the stacking direction of the positive electrode, separator and negative electrode in the main body 11.

[0096] The most convex position of the first punching pit 21 (i.e. Figure 5 The position shown in B) and the most concave position of the transition portion 23 (i.e. Figure 5 The distance between the planes where the position shown in A is located is the deepest pit depth of the first punching pit 21.

[0097] The most convex position of the second punching pit 22 (i.e. Figure 5 The position shown by O in the figure) and the most concave position of the transition portion 23 (i.e. Figure 5 The distance between the planes where the position shown in A is located is the deepest pit depth of the second punching pit 22.

[0098] The depth of the first pit 21 is greater than the depth of the second pit. Thus, the depth of the second pit 22 is less than or equal to the depth of the first pit 21. This allows the second pit 22 to accommodate the electrolyte squeezed out of the first pit 21 and ensures that the provision of the second pit 22 does not increase the overall thickness of the battery housing 2.

[0099] Furthermore, the depth of the second pit 22 will not affect the arrangement of the batteries, thereby not affecting the convenience of setting up the battery module, nor will it affect the capacity space of the battery module.

[0100] In some embodiments, see Figure 4 The first punching pit 21 includes a first bottom surface 211, the second punching pit 22 includes a second bottom surface 221, the transition portion 23, the first bottom surface 211 and the second bottom surface 221 are parallel, and the horizontal distance between the first bottom surface 211 and the plane where the transition portion 23 is located is greater than or equal to the horizontal distance between the second bottom surface 221 and the plane where the transition portion 23 is located.

[0101] Specifically, the transition portion 23 , the first bottom surface 211 and the second bottom surface 221 are parallel, so that when the batteries are assembled into a module, the fit between the batteries is better, thereby increasing the overall capacity of the module.

[0102] The horizontal distance between the first bottom surface 211 and the plane where the transition portion 23 is located (i.e. Figure 4 H1 in the figure is greater than or equal to the horizontal distance between the second bottom surface 221 and the plane where the transition portion 23 is located (i.e. Figure 4 H2), so that the depth of the second pit 22 is less than or equal to the depth of the first pit 21, so that the second pit 22 can accommodate the electrolyte squeezed out of the first pit 21, and it can also ensure that the setting of the second pit 22 does not increase the overall thickness of the battery shell 2.

[0103] In some embodiments, see Figure 2 The battery also includes an electrode 3, and the battery cell 1 also includes a tab 12 extending outward from the top surface of the main body 11. The tab 12 includes a welding area 121, and the welding area 121 is welded to the electrode 3. The orthographic projection of the welding area 121 on the first plane does not coincide with the orthographic projection of the second pit 22 on the first plane. The first plane is the plane where the welding area 121 is located.

[0104] Specifically, one end of the electrode 3 is welded to the welding area 121 of the tab 12 , and the other end of the electrode 3 extends out of the battery housing 2 .

[0105] The orthographic projection of the welding area 121 on the first plane does not overlap with the orthographic projection of the second pit 22 on the first plane, that is, the welding area 121 and the second pit 22 are staggered. In this way, when the electrolyte squeezed out of the first pit 21 is squeezed into the second pit 22, the electrolyte will not cause impact and influence on the welding area 121, thereby ensuring the welding stability of the tab 12 and the electrode 3.

[0106] In addition, the welding area 121 is arranged at a position closer to the upper part of the battery shell 11, so that the distance between the welding area 121 and the battery shell 2 in the thickness direction is shorter, which can ensure that during the production and use of the battery, the battery shell 2 forms a certain protection and constraint on the welding area 121, so that the welding area 121 has better stability in the thickness direction.

[0107] In some embodiments, see Figure 2As shown, the side of the first pit 21 close to the second pit 22 is a first connecting portion 212, the first connecting portion 212 includes a first end 2121 and a second end 2122, the side of the second pit 22 close to the first pit 21 is a second connecting portion 222, the second connecting portion 222 includes a third end 2221 and a fourth end 2222, the first end 2121 and the third end 2221 are connected, and there is a gap between the second end 2122 and the fourth end 2222.

[0108] Specifically, the first end 2121 and the third end 2221 are connected, that is, the distance between the first end 2121 and the third end 2221 is zero, and the distance between the first pit 21 and the second pit 22 is very close. In this way, during the production and use of the battery cell 1, the electrolyte squeezed out from the first pit 21 can immediately enter the second pit 22, so that the impact of the squeezed electrolyte on the battery casing can be almost completely avoided.

[0109] A gap is provided between the second end 2122 and the fourth end 2222, so that the first pit 21 and the second pit 22 are not connected except for the first end 2121 and the third end 2221. The gap between the first pit 21 and the second pit 22 provides space for deformation of the first pit 21 and the second pit 22. When the electrolyte squeezed out of the first pit 21 is squeezed into the second pit 22, it may cause slight deformation of the second pit 22. Thus, the gap provides a buffer for this slight deformation of the second pit 22, preventing interference between the outer wall of the second pit 22 and the outer wall of the second pit 22.

[0110] Figure 6 A fourth structural schematic diagram of the battery housing 2 according to an embodiment of the present application is shown; Figure 7 A fifth structural schematic diagram of the battery housing 2 according to an embodiment of the present application is shown.

[0111] In some embodiments, as Figure 2 and Figure 6 As shown, the second punching hole 22 is located on a side of the first punching hole 21 close to the top surface of the main body 11 and / or on a side of the first punching hole 21 close to the bottom surface of the main body 11 .

[0112] Specifically, the top surface of the main body 11 is a surface of the main body 11 from which the tab 12 extends, and the bottom surface of the main body 11 is a surface opposite to the top surface of the main body 11 .

[0113] For example, taking the top surface of the main body 11 at the top and the bottom surface of the main body 11 at the bottom as an example, the second punching hole 22 can be located only on one side of the first punching hole 21 close to the top surface of the main body 11, that is, the second punching hole 22 can be located above the first punching hole 21 (such as Figure 2It can also be located only on one side of the first punching pit 21 close to the bottom surface of the main body 11, that is, the second punching pit 22 can be located below the first punching pit 21 (as shown); Figure 5 It can also be located at the same time on one side of the first punching hole 21 close to the bottom surface of the main body 11 and one side close to the top surface of the main body 11 (as shown); Figure 7 As shown), the second flushing pit 22 can be located above and below the first flushing pit 21 at the same time. In this case, one second flushing pit 22 corresponds to two second flushing pits 22. The setting position and number of the second flushing pits 22 are not limited here and can be selected according to actual needs.

[0114] In the present application, the second punching pit 22 and the first punching pit 21 are arranged in a diversified position, which can improve the flexibility of the preparation process and facilitate the actual preparation process while ensuring that the second punching pit 22 accommodates the electrolyte squeezed out during the production and use of the battery cell 1.

[0115] Figure 8 A second schematic front view of the battery housing 2 according to an embodiment of the present application is shown; Figure 9 A third schematic front view of the battery housing 2 according to an embodiment of the present application is shown.

[0116] In some embodiments, as Figure 8 and Figure 9 As shown, the first pit 21 includes two pit side walls 213 arranged opposite to each other, and the second pit 22 is provided on a side of at least one of the pit side walls 213 away from the first pit 21 .

[0117] Specifically, of the two crater side walls 213, only one crater side wall 213 may have the second crater 22 (e.g., Figure 9 As shown), the second crater 22 can also be provided on both sides of the two crater sidewalls 213 away from the first crater 21 (as shown). Figure 8 shown).

[0118] In the present application, the second pit 22 is arranged on at least one side of the first pit 21. In this way, during the production and use of the battery cell, the electrolyte stored in the first pit will be squeezed to a position outside the first pit due to the squeezing of the main body. The setting of the second pit can just accommodate this part of the squeezed electrolyte, which can reduce the amount of electrolyte accumulation, buffer or even avoid the impact of this part of the squeezed electrolyte on the battery shell, thereby avoiding damage to the battery shell and reducing the risk of ion short circuit.

[0119] Figure 10 A sixth structural schematic diagram of the battery housing 2 according to an embodiment of the present application is shown.

[0120] In some embodiments, as Figure 2 and Figure 10 As shown, the battery housing 2 includes two half-shells 24 arranged opposite to each other, and at least one of the half-shells 24 is provided with the first pit 21 and the second pit 22 .

[0121] Specifically, the first punching hole 21 and the second punching hole 22 may be provided on only one half shell 24 (e.g. Figure 2 As shown), the first punching hole 21 and the second punching hole 22 can also be provided on the two half shells 24 at the same time (as shown Figure 10 There is no specific limitation and you can choose according to your actual needs.

[0122] When the first pit 21 and the second pit 22 are provided on only one half shell 24, the second pit 22 can be used to accommodate the electrolyte squeezed out during the production and use of the battery cell 1 without increasing the complexity of the manufacturing process too much. Moreover, when the pit is provided on one side, the width of the entire shell is relatively small.

[0123] When the first pits 21 and the second pits 22 are simultaneously provided on the two half shells 24 , the two second pits 22 can accommodate more electrolyte in the double-sided pits compared to the single-sided pits, but the width of the entire shell will be slightly increased.

[0124] In the present application, the positions of the first pit 21 and the second pit 22 are diversified, which can ensure that the second pit 22 can accommodate the electrolyte squeezed out during the production and use of the battery cell 1, and can also flexibly adjust the positions of the first pit 21 and the second pit 22 based on actual needs.

[0125] Figure 11 A seventh structural schematic diagram of the battery housing 2 according to an embodiment of the present application is shown.

[0126] In some embodiments, see Figure 11 As shown, the battery housing 2 includes two half-shells 24 arranged opposite to each other, one of the half-shells 24 is provided with the first pit 21 and the second pit 22 , and the other half-shell 24 is provided with the first pit 21 .

[0127] Specifically, one of the two half-shells 24 is provided with the first recess 21 and the second recess 22. The first recess 21 accommodates the main body 11 and at least a portion of the electrolyte, while the second recess 22 accommodates at least a portion of the electrolyte. Meanwhile, the first recess 21 is provided on the other half-shell 24 to accommodate the main body 11 together with the first recess 21 on the first half-shell 24. This allows for a larger main body 11 to be accommodated, thereby increasing the volumetric energy density of the battery.

[0128] A second aspect of the present application provides a battery module comprising one or more batteries according to any one of the first aspects. The battery module has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0129] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the above embodiments or technical features in different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of simplicity.

[0130] The embodiments of the present application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: A battery cell, an electrolyte and a battery shell, wherein the battery cell includes a main body, and the battery shell includes a first pit and a second pit, wherein the first pit accommodates the main body and at least part of the electrolyte, and the second pit does not accommodate the main body and accommodates at least part of the electrolyte.

2. The battery according to claim 1, characterized in that The battery housing further includes a transition portion located between the first pit and the second pit.

3. The battery according to claim 2, characterized in that The transition portion and the first punching pit meet the condition: 5L≤H 2 / M≤150L, wherein H is the distance between the most convex position of the first pit and the plane where the most concave position of the transition portion is located, M is the thickness of the transition portion, and L is the length of the transition portion.

4. The battery according to claim 3, characterized in that 1mm≤H≤6mm, 0.05mm≤M≤0.16mm, 0.4mm≤L≤1.5mm.

5. The battery according to any one of claims 2 to 4, characterized in that The distance between the plane where the most convex position of the first punching pit and the plane where the most concave position of the transition portion are located is greater than or equal to the distance between the plane where the most convex position of the second punching pit and the plane where the most concave position of the transition portion are located.

6. The battery according to claim 5, characterized in that The first pit includes a first bottom surface, the second pit includes a second bottom surface, the transition portion, the first bottom surface and the second bottom surface are parallel, and the distance between the first bottom surface and the plane where the transition portion is located is less than or equal to the distance between the second bottom surface and the plane where the transition portion is located.

7. The battery according to claim 1, characterized in that The battery also includes an electrode, and the battery cell also includes a tab extending outward from the top surface of the main body. The tab includes a welding area, and the welding area is welded to the electrode. The orthographic projection of the welding area on the first plane does not overlap with the orthographic projection of the second pit on the first plane. The first plane is the plane where the welding area is located.

8. The battery according to claim 1, characterized in that The side of the first pit close to the second pit is a first connecting portion, the first connecting portion includes a first end and a second end, the side of the second pit close to the first pit is a second connecting portion, the second connecting portion includes a third end and a fourth end, the first end and the third end are connected, and there is a gap between the second end and the fourth end.

9. The battery according to claim 1, characterized in that The second punching hole is located on a side of the first punching hole close to the top surface of the main body, and / or is located on a side of the first punching hole close to the bottom surface of the main body.

10. The battery according to claim 1, characterized in that The first crater comprises two oppositely arranged crater side walls, and the second crater is provided on a side of at least one of the crater side walls away from the first crater.

11. The battery according to claim 1, characterized in that The battery housing includes two half-shells arranged opposite to each other, and at least one of the half-shells is provided with the first pit and the second pit.

12. The battery according to claim 1, characterized in that The battery housing includes two half-shells arranged opposite to each other, one of the half-shells is provided with the first pit and the second pit, and the other half-shell is provided with the first pit.

13. A battery module, characterized in that: A battery comprising the battery according to any one of claims 1 to 12.

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