Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model discloses a single battery, a battery and electric equipment, the single battery comprises a shell, the shell comprises a first wall and a second wall adjacent to the first wall, the first wall comprises a main body part extending along a first direction, the first wall further comprises an avoiding part, the inner surface of the avoiding part is connected with the inner surface of the main body part, and the second wall is adjacent to the first wall; the inner surface of the avoiding part extends towards the outside of the shell to the second wall so as to form an avoiding space with the second wall; the electrode assembly is accommodated in the shell; wherein the first direction is perpendicular to the stacking direction of the electrode plates of the electrode assembly, the second wall is perpendicular to the first direction, an acute angle is formed between the extension direction of the avoiding part and the first direction, and the end part of the electrode assembly is accommodated in the avoiding space, so that the end part of the electrode assembly can be protected, and the safety and the reliability of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used as convenient and efficient energy carriers. An electrode assembly is accommodated inside a battery cell of the battery. During the process of assembling the electrode assembly into the casing, the electrode assembly is prone to collision and extrusion, thereby causing damage to the electrode assembly, especially the end portion of the electrode assembly. In addition, during the use of the battery, due to vibration or other possible movements, the electrode assembly shakes and tilts inside the casing of the battery cell, which will also cause damage to the end portion of the electrode assembly, thereby generating a risk of lithium plating and threatening the safety of battery use.

[0003] Therefore, how to protect the electrode assembly has become an urgent problem to be solved. Summary of the Utility Model

[0004] Embodiments of the present application provide a battery cell, a battery, and an electrical device, which can protect the end portion of the electrode assembly accommodated in the battery cell.

[0005] In a first aspect, a battery cell is provided, including: a casing, the casing includes a first wall and a second wall adjacent to the first wall, the first wall includes a main body portion extending in a first direction, the first wall further includes an avoidance portion, an inner surface of the avoidance portion is connected to an inner surface of the main body portion, and the inner surface of the avoidance portion extends towards the outside of the casing to the second wall to form an avoidance space with the second wall; an electrode assembly, the electrode assembly is accommodated inside the casing; wherein, the first direction is perpendicular to the stacking direction of the electrode plates of the electrode assembly, the second wall is perpendicular to the first direction, the extending direction of the avoidance portion forms an acute angle with the first direction, and the end portion of the electrode assembly is accommodated in the avoidance space.

[0006] In the embodiments of the present application, the avoidance portion extends towards the outside of the casing to the second wall to form an avoidance space, and the end portion of the electrode assembly is accommodated through the avoidance space, thereby effectively reducing the wear and extrusion of the end portion of the electrode assembly during the battery assembly and use processes, and improving the safety and stability of the battery.

[0007] In combination with the first aspect, in some implementation manners, an outer surface of the avoidance portion is connected to an outer surface of the main body portion, and the outer surface of the avoidance portion extends in a direction forming an acute angle with the first direction and towards the outside of the casing.

[0008] In combination with the first aspect, in some implementation manners, the maximum dimension d1 of the orthographic projection of the casing in the stacking direction along a second direction and the minimum dimension d2 along the second direction satisfy: 0.8≤d2 / d1≤0.99, wherein the second direction is perpendicular to the first direction and the stacking direction.

[0009] In combination with the first aspect, in some implementations, the dimension d3 of the orthographic projection of the avoidance portion in the stacking direction along the first direction ranges from 1 cm to 10 cm, and the dimension d4 of the orthographic projection of the avoidance portion in the stacking direction along the second direction ranges from 0.2 mm to 5 cm, where the second direction is perpendicular to the first direction and the stacking direction.

[0010] In combination with the first aspect, in some implementations, the outer surface of the avoidance portion is flush with the outer surface of the main body portion, and the thickness of the avoidance portion gradually decreases along the first direction.

[0011] In the embodiments of the present application, through the design of the thickness of the outer shell, an avoidance space is designed without changing the appearance of the outer shell, the energy density of the battery is not affected, and the end portion of the electrode assembly can be simply and effectively protected.

[0012] In combination with the first aspect, in some implementations, the thickness of the thinnest part of the avoidance portion ranges from 0.2 mm to 1.5 mm, and the thickness of the main body portion ranges from 1.5 mm to 5 mm.

[0013] In combination with the first aspect, in some implementations, the dimension d3 of the orthographic projection of the avoidance portion in the stacking direction along the first direction and the dimension d5 of the orthographic projection of the main body portion in the stacking direction along the first direction satisfy: 0.01 ≤ d3 / d5 ≤ 0.2.

[0014] In combination with the first aspect, in some implementations, the electrode assembly includes a negative electrode tab, and the negative electrode tab is accommodated in the avoidance space.

[0015] In the embodiments of the present application, the positive electrode tab and the negative electrode tab of the electrode assembly can be combined together by a stacking method, and the end portion of the negative electrode tab can be preferentially protected to avoid lithium deposition caused by excessive wear of the negative electrode tab when the length of the negative electrode tab is greater than that of the positive electrode tab.

[0016] In combination with the first aspect, in some implementations, the electrode assembly further includes a positive electrode tab, and the positive electrode tab and the negative electrode tab are accommodated in the avoidance space.

[0017] In combination with the first aspect, in some implementations, the first wall is the bottom wall of the outer shell.

[0018] In the embodiments of the present application, since when the battery cell is in use, the bottom of the electrode assembly in the gravity direction bears the weight of the entire electrode assembly, it is more vulnerable to damage. By providing an avoidance portion on the first wall that is lower in the gravity direction to form an avoidance space, the wear of the electrode assembly can be more effectively reduced.

[0019] Furthermore, when the edge formed by stacking the corners of the electrode tab is under extrusion and shaking, it is more likely to collide with the bottom wall. Providing an avoidance space on the bottom wall can focus on protecting the edge where the corner of the electrode tab is located.

[0020] In combination with the first aspect, in some implementations, the included angle range between the extending direction of the avoidance portion and the first direction is from 1° to 30°.

[0021] In combination with the first aspect, in some implementations, the inner surface of the avoidance portion and the inner surface of the main body portion are connected by a rounded corner.

[0022] In combination with the first aspect, in some implementations, the battery cell further includes two electrode terminals, the two electrode terminals are arranged on the same side or both sides in the length direction of the battery cell, the housing includes a cover plate, and a pressure relief mechanism is provided on the cover plate or the first wall.

[0023] In combination with the first aspect, in some implementations, the battery cell further includes a first fixing member, the first fixing member is arranged on the side of the cover plate facing the electrode assembly, the first fixing member is detachably connected to the second fixing member, and the second fixing member is used to fix the tab of the electrode assembly.

[0024] In combination with the first aspect, in some implementations, the battery cell further includes: a third fixing member, the third fixing member is oppositely arranged on both sides of the electrode assembly along the second direction, and the third fixing member is fixedly connected to the electrode assembly, wherein the second direction is perpendicular to the first direction and the stacking direction.

[0025] In a second aspect, a battery is provided, including: a box body and a plurality of battery cells according to any implementation of the first aspect, and the plurality of battery cells are arranged along the stacking direction or the first direction.

[0026] In combination with the second aspect, in some implementations, the battery further includes: a fixing portion, wherein the fixing portion is arranged on the inner wall of the box body, and the shape of the fixing portion is at least partially complementary to the shape of the avoidance portion to fix the battery cell.

[0027] In combination with the second aspect, in some implementations, the battery further includes: a cooling mechanism, wherein a cavity is formed between the avoidance portion and the main body portion and the box body, and at least part of the cooling mechanism is located in the cavity.

[0028] In a third aspect, an electrical device is provided, including a battery according to any implementation of the second aspect, and the battery is used to provide electrical energy for the electrical device. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0030] Figure 2 It shows a schematic structural diagram of a battery provided by an embodiment of the present application.

[0031] Figure 3 It shows a schematic diagram of a plurality of battery cells included in the battery provided by an embodiment of the present application.

[0032] Figure 4 The structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0033] Figure 5 The partial exploded structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0034] Figure 6 The front view of the battery cell provided by an embodiment of the present application.

[0035] Figure 7 The front view of the battery cell provided by another embodiment of the present application.

[0036] Figure 8 The schematic diagram showing the stacking of the positive electrode plate and the negative electrode plate of the electrode assembly.

[0037] Figure 9 The front view of the battery cell provided by still another embodiment of the present application.

[0038] Figure 10 The perspective view of the housing of the battery cell provided by some possible embodiments of the present application.

[0039] Figure 11 The structural schematic diagram of the battery provided by an embodiment of the present application.

[0040] Figure 12 The main structural schematic view of the battery provided by an embodiment of the present application.

[0041] Figure 13 The main structural schematic view of the battery provided by another embodiment of the present application. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings.

[0043] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0044] The orientation terms used in the following description are all the directions shown in the figures, and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] In the present application, the battery cell may include a primary battery and a secondary battery. For example, it may be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this. The battery cell may be in the shape of a flat body, a cuboid or other shapes, etc., and the embodiments of the present application do not limit this either. Generally, the battery cell can be divided into a cylindrical battery cell and a square battery cell according to the packaging method, and the embodiments of the present application do not limit this either.

[0046] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0047] The battery cell may include an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector without the coated positive active material layer protrudes from the current collector with the coated positive active material layer. The current collector without the coated positive active material layer serves as the positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector without the coated negative active material layer protrudes from the current collector with the coated negative active material layer. The current collector without the coated negative active material layer serves as the negative electrode ear. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that it does not fuse when passing a large current, the number of positive electrode ears is multiple and stacked together, and the number of negative electrode ears is multiple and stacked together. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto. When the electrode assembly is a wound structure, the electrode assembly can also present a flat shape. The direction towards the flatter side of the electrode assembly is the thickness direction of the electrode assembly, which can also be considered as the stacking direction of the electrode tabs.

[0048] The separator is disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes and at the same time allow active ions to pass through. The present application does not particularly limit the type of the separator, and any well-known porous structure separator with good chemical stability and mechanical stability can be selected.

[0049] Exemplarily, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0050] In the battery cell of the embodiments of the present application, the electrode assembly is accommodated inside. During the process of assembling the electrode assembly into the shell, the electrode assembly is prone to collision and extrusion, thereby causing damage to the electrode assembly, especially to the positions with corners of the electrode assembly. In addition, during the use of the battery, due to vibration or other possible movements, the electrode assembly shakes and tilts inside the outer shell of the battery cell, which will also cause damage to the corners of the electrode assembly, thereby generating a risk of lithium deposition and threatening the use safety of the battery.

[0051] Therefore, the embodiments of the present application provide a battery cell, a battery, and an electrical device, which can solve the problem that the corners of the electrode assembly are easily damaged. For the battery cell housing and the electrode assembly of the embodiments of the present application, the electrode assembly is accommodated in the housing. The housing includes a first wall and a second wall adjacent to the first wall. The first wall includes a main body portion extending in a first direction, and the first wall further includes an avoidance portion. The inner surface of the avoidance portion is connected to the inner surface of the main body portion, and the inner surface of the avoidance portion extends towards the outside of the housing to the second wall to form an avoidance space with the second wall. Wherein, the first direction is perpendicular to the stacking direction of the electrode tabs of the electrode assembly, the second wall is perpendicular to the first direction, the extending direction of the avoidance portion forms an acute angle with the first direction, and the end portion of the electrode assembly is accommodated in the avoidance space. This design can protect the end portion of the electrode assembly in the battery cell and thus avoid damage caused by the end portion colliding with and being squeezed by the inner wall of the housing.

[0052] The technical solutions described in the embodiments of the present application are applicable to various electrical devices or energy storage devices using batteries.

[0053] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and a planer, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical devices.

[0054] The following Figures 1 to 5 describes the general structures of the battery cell, the battery, and the electrical device in the embodiments of the present application.

[0055] For the convenience of description, the following embodiments take the electrical device as a vehicle as an example for illustration.

[0056] For example, as Figure 1As shown in the figure, it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A motor 60, a controller 50, and a battery 10 can be arranged inside the vehicle 1. The controller 50 is used to control the power supply of the battery 10 to the motor 60. For example, the battery 10 can be arranged at the bottom, the front end, or the rear end of the vehicle 1. The battery 10 can be used for power supply of the vehicle 1. For example, the battery 10 can be used as the operating power source of the vehicle 1 and be used for the circuit system of the vehicle 1, such as the power consumption requirements for starting, navigation, and operation of the vehicle 1. In another embodiment of the present application, the battery 10 can not only be used as the operating power source of the vehicle 1 but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0057] To meet different power usage requirements, the battery 10 can include a plurality of battery cells. Among them, the plurality of battery cells can be connected in series, in parallel, or in a series-parallel combination. The series-parallel combination means a combination of series and parallel connections. The battery can also be referred to as a battery pack. Optionally, the plurality of battery cells can first be connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a battery. That is to say, the plurality of battery cells can directly form a battery, or can first form battery modules, and then the battery modules form a battery.

[0058] For example, Figure 2 shows a schematic structural diagram of a battery 10 provided by an embodiment of the present application. The battery 10 can include a plurality of battery cells 20; Figure 3 shows a schematic diagram of the plurality of battery cells 20 included in the battery 10 provided by an embodiment of the present application. As Figure 2 and Figure 3 shown, the battery 10 can further include a box body 11. The inside of the box body 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the box body 11. Figure 2 shows a possible implementation manner of the box body 11 according to an embodiment of the present application. As Figure 2 shown, the box body 11 can include two parts, which are respectively referred to as a first part 111 and a second part 112 here. The first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 can be determined according to the shape of the combined battery cells. At least one of the first part 111 and the second part 112 has an opening. For example, as Figure 2 shown, both the first part 111 and the second part 112 can be hollow cuboids and each has only one open face. The opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are buckled together to form a box body 11 with a closed chamber.

[0059] For another example, different from Figure 2 as shown, only one of the first part 111 and the second part 112 can be a hollow cuboid with an opening, and the other can be a plate-shaped part to cover the opening. For example, here, taking the second part 112 as the hollow cuboid with only one face being the opening face and the first part 111 being plate-shaped, then the first part 111 covers the opening of the second part 112 to form a box body 11 with a closed chamber, and this chamber can be used to accommodate a plurality of battery cells 20. A plurality of battery cells 20 are placed in the box body 11 formed after the first part 111 and the second part 112 are buckled together after being connected in parallel or in series or in a mixed connection combination.

[0060] Optionally, the battery 10 may further include other structures, which will not be elaborated one by one here. For example, as Figure 2 and Figure 3 shown, the battery 10 may further include a busbar component 12, and the busbar component 12 is used to realize the electrical connection between a plurality of battery cells 20, such as parallel connection or series connection or mixed connection. Specifically, the busbar component 12 can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component 12 can be connected to the electrode terminals of the battery cells 20 by welding. The electrical energy of a plurality of battery cells 20 can be further led out through a conductive mechanism passing through the box body 11.

[0061] Figure 3 The busbar component 12 in [[ ]] is exemplarily arranged on the side surface of the battery cell 20, but the busbar component can also be arranged at other positions, such as the top surface of the battery cell 20, and the present application does not make any limitation thereto.

[0062] Figure 4 is a schematic structural diagram of a battery cell 20 provided by an embodiment of the present application, Figure 5 is a partial exploded structural diagram of a battery cell 20 provided by an embodiment of the present application. For example, Figure 5 the battery cell 20 shown can be Figures 2 to 4 any one of the battery cells 20 in [[ ]]. As Figure 4 and Figure 5 shown, for the convenience of description, a rectangular battery cell 20 is taken as an example. Among them, the direction Z in the figure represents the height direction of the battery cell 20, the direction X in the figure represents the width direction of the battery cell 20 or the thickness direction of the battery cell 20. Optionally, when the electrode assembly 22 in the battery cell 20 has a stacked structure, the direction X in the figure can also represent the stacking direction of the electrode plates of the electrode assembly 22 in the battery cell 20, the direction Y in the figure represents the length direction of the battery cell 20, and the height direction Z, width direction X and length direction Y of the battery cell 20 are perpendicular to each other.

[0063] As Figure 4 andFigure 5 As shown, the battery cell 20 of the embodiment of the present application may include: a housing 21. Specifically, the housing 21 may include: a housing body 211, which is a hollow structure with at least one opening; a cover plate 212 for covering the opening of the housing body. The battery cell 20 may further include an electrode assembly 22, and the electrode assembly 22 is accommodated in the housing 21. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum plastic film, etc.

[0064] In the embodiment of the present application, the housing body 211 may be a hollow structure with openings formed at opposite ends, and the cover plates 212 may be provided in two, and the two cover plates 212 respectively cover the openings at both ends of the housing body 211.

[0065] The housing body 211 may be of various shapes, for example, a cuboid or other polyhedrons. Exemplarily, as Figure 4 and Figure 5 shown, in the embodiment of the present application, mainly taking the housing body 211 as a cuboid structure and the housing body 211 as a hollow structure with an opening formed at one end as an example for description.

[0066] It should be understood that the cover plate 212 of the embodiment of the present application is a component for covering the opening of the housing body 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 may be adapted to the shape of the housing body 211. As Figure 4 and Figure 5 shown, the housing body 211 is a cuboid structure, and the cover plate 212 is a rectangular plate-like structure adapted to the housing body 211.

[0067] In the embodiment of the present application, the material of the cover plate 212 may also be various, for example, copper, iron, aluminum, steel, aluminum alloy, etc. Optionally, the material of the cover plate 212 may be the same as or different from the material of the housing body 211.

[0068] In addition, a pressure relief mechanism 213 may be provided for the battery cell 20. The pressure relief mechanism 213 may be provided on the cover plate 212 or on other walls. In the figure, the pressure relief mechanism 213 is shown as being provided on the cover plate, but the present application is not limited thereto. The pressure relief mechanism 213 refers to an element or component that actuates to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The predetermined threshold may be adjusted according to different design requirements. The predetermined threshold may depend on one or several materials among the positive electrode plate, negative electrode plate, electrolyte, and separator membrane in the battery cell 20. The pressure relief mechanism 213 may employ elements or components that are sensitive to pressure or temperature, that is, when the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 213 actuates, thereby forming a channel for the internal pressure or temperature to be released.

[0069] As used in this application, "actuation" refers to the movement or activation of the pressure relief mechanism 213 to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The movement generated by the pressure relief mechanism 213 may include, but is not limited to: at least a part of the pressure relief mechanism 213 rupturing, breaking, being torn, or opening, etc. When the pressure relief mechanism 213 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell 20 can be relieved under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0070] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolytes, dissolved or split positive and negative electrode plates, fragments of separator membranes, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0071] The battery cell 20 further includes electrode terminals 214. The electrode terminals 214 in the embodiments of this application are used to electrically connect to the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. As Figures 4 to 5 shown, the battery cell 20 may include at least two electrode terminals 214. The at least two electrode terminals 214 may include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b. The positive electrode terminal 214a is used to electrically connect to the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used to electrically connect to the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a and the negative electrode terminal 214b may be located on the same side of the battery cell or on different sides. The positive electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, and the negative electrode terminal 214b and the negative electrode tab 222b may be directly connected or indirectly connected. Exemplarily, the positive electrode terminal 214a may be electrically connected to the positive electrode tab 222a through a connecting member, and the negative electrode terminal 214b is electrically connected to the negative electrode tab 222b through a connecting member.

[0072] In the battery cell 20, the electrode assembly 22 is the component that undergoes electrochemical reactions in the battery cell 20. According to actual usage requirements, the electrode assembly 22 in the housing 211 can be set to one or multiple. For example, as Figure 4 and Figure 5 shown, there are 2 electrode assemblies 22 provided in the battery cell 20. The electrode assembly 22 can be a cuboid or a cuboid-like shape, etc. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be adapted to a cuboid structure.

[0073] As Figure 4 and Figure 5As shown, the electrode assembly 22 includes a tab 222 and an electrode main body 221. Among them, the tab 222 of the electrode assembly 22 may include a positive tab 222a and a negative tab 222b. The positive tab 222a may be formed by laminating a portion of the positive electrode tab where the positive active material layer is not coated, and the negative tab 222b may be formed by laminating a portion of the negative electrode tab where the negative active material layer is not coated; the electrode main body 221 may be formed by laminating or winding the positive electrode tab and the negative electrode tab with each other.

[0074] The following will combine Figures 6 to 10 to illustrate a battery cell provided by an embodiment of the present application.

[0075] Among them, Figure 6 is the front view of a battery cell provided by an embodiment of the present application. Figure 7 is the front view of a battery cell provided by another embodiment of the present application.

[0076] As Figure 6 and Figure 7 shown, the housing 21 of the battery cell 20 can accommodate the electrode assembly 22. The housing 21 may include a first wall 216 and a second wall 217, and the second wall 217 may be adjacent to the first wall 216. The first wall 216 may include a main body portion 216b extending in the first direction Y, and the first wall 216 further includes an avoidance portion 216a. The inner surface of the avoidance portion 216a is connected to the inner surface of the main body portion 216b. The inner surface of the avoidance portion 216a extends towards the outside of the housing 21 to the second wall 217 to form an avoidance space 34 with the second wall 217, and the extension direction of the avoidance portion 216a forms an acute angle with the first direction. The end of the electrode assembly 22 is accommodated in the avoidance space 34, thereby reducing the end of the electrode assembly 22 from being squeezed, skewed and worn.

[0077] Among them, the first direction may be a direction perpendicular to the stacking direction of the electrode tabs of the electrode assembly 22. Exemplarily, when the housing 21 is a cube, the first wall 216 may be the wall opposite to the side surface of the electrode assembly 22. At this time, the avoidance space 34 can accommodate the edge formed by the stacking of the corners of the electrode tabs in the electrode assembly 22, so as to better protect the corners of the electrode tabs. The side surface of the electrode assembly 22 refers to the surface parallel to the stacking direction of the electrode tabs.

[0078] When the second wall 217 of the housing 21 is arranged at the position where the opening of the housing 211 is located, the second wall 217 may be a cover plate 212, and the second wall 217 may also be a wall other than the cover plate 212. The embodiment of the present application does not limit this.

[0079] The first wall 216 may be multiple walls of the battery cell 20. For example, Figure 6 in

[0080] When the electrode assembly 22 is a wound electrode assembly, the stacking direction of the electrode tabs can be the direction facing the flatter surface.

[0081] In the embodiment of the present application, the avoidance portion 216a extends towards the outside of the housing 21 to the second wall 217 to form an avoidance space 34. By accommodating the end portion of the electrode assembly 22 through the avoidance space 34, the wear and extrusion of the end portion of the electrode assembly during battery assembly and use are effectively reduced, improving the safety and stability of the battery.

[0082] Optionally, the avoidance space 34 can accommodate the ridge formed by the corner stacking of the electrode tabs in the electrode assembly 22, thereby better reducing the wear and collision damage of the electrode assembly 22.

[0083] The avoidance space 34 can refer to the space formed by the avoidance portion 216a and the entire second wall 217. The avoidance space 34 can accommodate the end portion of the electrode assembly 22, and can also accommodate the first fixing member 32 and the second fixing member 33 in the figure. Exemplarily, the first fixing member 32 is the lower plastic under the cover plate, and the second fixing member 33 is the ear bracket. The lower plastic can fix the ear bracket, and the ear bracket can fix the ear 222.

[0084] Optionally, the battery cell 20 can further include a third fixing member 31. The third fixing member 31 is disposed on both sides of the electrode assembly 22 along the second direction and is fixedly connected to the electrode assembly 22. Exemplarily, the third fixing member 31 can be the side support plate of the electrode assembly 22, and the side support plate can be fixedly connected to the electrode assembly 22 by bonding, thereby restricting the shaking of the electrode assembly 22 in the second direction.

[0085] As a possible embodiment, as Figure 6 shown, the first wall 216 of the housing 21 can be of equal thickness. The entire first wall 216 extends towards the outside of the housing 21 at the avoidance portion 216a. That is, the outer surface of the avoidance portion 216a is connected to the outer surface of the main body portion 216b. The outer surface of the avoidance portion 216a extends to the second wall 217 along a direction that forms an acute angle with the first direction and faces the outside of the housing 21, thereby generating an avoidance space 34 with the second wall 217.

[0086] Optionally, as Figure 6 , Figure 7 and Figure 9 shown, the maximum dimension d1 and the minimum dimension d2 of the orthographic projection of the housing 21 in the stacking direction of the electrode tabs along the second direction satisfy: 0.8 ≤ d2 / d1 ≤ 0.99. That is, the ratio range of the widest dimension to the narrowest dimension of the housing 21 along the second direction is [0.8, 0.99].

[0087] Exemplarily, the ratio of d1 to d2 can be 0.8, 0.82, 0.85, 0.87, 0.90, 0.93, 0.95, 0.98, 0.99, etc.

[0088] Further optionally, d1 and d2 satisfy: 0.85 ≤ d2 / d1 ≤ 0.98.

[0089] An overly small ratio may cause the avoidance portion 216a to extend too long outward, resulting in energy density loss of the battery. An overly large ratio may cause the avoidance portion 216a to not protect the end of the electrode assembly well. In the embodiments of the present application, the ratio of the widest dimension to the narrowest dimension of the outer shell 21 in the second direction is designed to protect the end of the electrode assembly 22 while ensuring the energy density of the battery.

[0090] Optionally, as Figure 6 、 Figure 7 and Figure 9 shown, the dimension d3 of the positive projection of the avoidance portion 216a in the stacking direction of the electrode plates along the first direction ranges from 1 cm to 10 cm, and the dimension d4 of the positive projection of the avoidance portion 216a in the stacking direction of the electrode plates along the second direction ranges from 0.2 mm to 5 cm. That is, the length range of the avoidance portion 216a in the length direction of the battery cell 20 is from 1 cm to 10 cm, and the height range of the avoidance portion 216a in the height direction of the battery cell 20 is from 0.2 mm to 5 cm.

[0091] Exemplarily, d3 can be 1 cm, 1.2 cm, 1.5 cm, 2 cm, 3 cm, 4 cm, 5 cm, 8 cm, 10 cm, etc., and d4 can be 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.3 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, 1 cm, 1.5 cm, 2 cm, 3 cm, 5 cm, etc.

[0092] Further optionally, the range of d3 can be from 2 cm to 6 cm, and the range of d4 can be from 1.5 cm to 3 cm.

[0093] Further optionally, d3 and d4 can satisfy: d3 ≥ d4. The dimension of the avoidance portion 216a in the length direction of the battery cell 20 being greater than the dimension in the height direction of the battery cell 20 is beneficial to improving the energy density of the battery cell 20.

[0094] If the size of the avoidance part 216a in the length direction of the battery cell 20 is too large, it may easily cause the electrode assembly 22 to move, while if the size is too small, the end of the electrode assembly 22 may slide out of the avoidance space 34. If the size of the avoidance part 216a in the height direction of the battery cell 20 is too large, the avoidance part 216a may extend too long outward, resulting in energy density loss of the battery. An overly large ratio may cause the avoidance part 216a to not protect the end of the electrode assembly well. In the embodiments of the present application, by designing the size of the avoidance part 216a, the end of the electrode assembly 22 can be protected within a reasonable range.

[0095] Optionally, as Figure 6 , Figure 7 and Figure 9 shown, the angular range of the angle between the extending direction of the avoidance part 216a and the first direction may be from 1° to 30°.

[0096] Exemplarily, the angle between the extending direction of the avoidance part 216a and the first direction may be 1°, 1.5°, 2°, 3°, 5°, 8°, 10°, 15°, 20°, 25° or 30°, etc.

[0097] Optionally, the angular range of the angle between the extending direction of the avoidance part 216a and the first direction may be from 10° to 30°.

[0098] If the angle between the extending direction of the avoidance part 216a and the first direction is too large, the end of the outer shell may be too large, affecting the energy density of the battery. If the angle between the extending direction of the avoidance part 216a and the first direction is too small, the collision between the electrode assembly 22 and the first wall 216 may not be effectively reduced. In the embodiments of the present application, by designing the angle between the extending direction of the avoidance part 216a and the first direction, the end of the electrode assembly 22 is protected while ensuring the energy density of the battery.

[0099] As another possible embodiment, as Figure 7 shown, the first wall 216 of the outer shell 21 may have unequal thicknesses, and the thickness of the outer shell 21 gradually decreases along the first direction at the avoidance part 216a, that is, the outer surface of the avoidance part 216a is flush with the outer surface of the main body part 216b, and the thickness of the avoidance part 216a gradually decreases along the first direction, thereby generating the avoidance space 34.

[0100] In the embodiments of the present application, by designing the thickness of the outer shell, an avoidance space is designed without changing the appearance of the outer shell, without affecting the energy density of the battery and the stacking between battery cells, and the end of the electrode assembly can be simply and effectively protected.

[0101] Optionally, the thickness of the thinnest part of the avoidance part 216a is 0.2 mm to 1.5 mm, and the thickness of the main body part 216b is 1.5 mm to 5 mm.

[0102] Exemplarily, the thickness of the thinnest part of the avoidance portion 216a can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm or 1.5 mm, and the thickness of the main body portion 216b can be 1.5 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm or 5 mm, etc.

[0103] Further optionally, the thickness of the thinnest part of the avoidance portion 216a is 0.5 mm to 1.0 mm, and the thickness of the main body portion 216b is 2.0 mm to 4.0 mm.

[0104] Optionally, as Figure 6 、 Figure 7 and Figure 9 shown, the dimension d3 of the positive projection of the avoidance portion 216a in the stacking direction of the electrode plates along the first direction and the dimension d5 of the positive projection of the main body portion 216b in the stacking direction of the electrode plates along the first direction satisfy 0.01 ≤ d3 / d5 ≤ 0.2. That is, the ratio range of the length of the avoidance portion 216a in the length direction of the battery cell 20 to the length of the main body portion 216b in the length direction of the battery cell 20 is [0.01, 0.2].

[0105] Exemplarily, the ratio of d3 to d5 can be 0.01, 0.015, 0.02, 0.03, 0.05, 0.08, 0.1, 0.15 or 0.2, etc.

[0106] Further optionally, d3 and d5 satisfy: 0.02 ≤ d3 / d5 ≤ 0.1.

[0107] If the ratio of the dimensions of the avoidance portion 216a to the main body portion 216b in the length direction of the battery cell 20 is too large, the electrode assembly 22 may easily move. If this ratio is too small, the end of the electrode assembly 22 may slide out of the avoidance space 34. In the embodiments of the present application, by designing the ratio of the dimensions of the avoidance portion 216a to the main body portion 216b in the length direction of the battery cell 20, the stability of the electrode assembly 22 and the protection of the end of the electrode assembly 22 are taken into account.

[0108] In a possible design, the electrode assembly 22 includes a positive electrode plate and a negative electrode plate, and the negative electrode plate is accommodated in the avoidance space 34 while the positive electrode plate is not accommodated in the avoidance space 34.

[0109] In a possible design, both the positive electrode tab and the negative electrode tab of the electrode assembly 22 are received in the avoidance space 34. Optionally, when avoidance spaces 34 are provided at both ends of the battery cell 20 in the length direction, only the negative electrode tab may be received in the avoidance space 34 at one end, and both the negative electrode tab and the positive electrode tab may be received in the avoidance space 34 at the other end.

[0110] Specifically, Figure 8 A schematic diagram showing the stacking of the positive electrode tab and the negative electrode tab of the electrode assembly is shown. As Figure 8 shown, the positive electrode tab 41 and the negative electrode tab 42 of the electrode assembly 22 can be combined together by laminating. The negative electrode tab 42 needs to be longer than the positive electrode tab 41 to avoid lithium plating. Therefore, the end portion of the negative electrode tab 42 can be preferentially protected, thereby avoiding excessive wear of the negative electrode tab 42.

[0111] As a possible embodiment, as Figure 9 shown for the battery cell, different from the Figure 6 battery cell, the first wall 216 can be the bottom wall of the battery cell 20.

[0112] Specifically, since when the battery cell 20 is in use, the bottom of the electrode assembly 22 in the gravity direction bears the weight of the entire electrode assembly 22, it is more likely to be damaged by extrusion. By providing the avoidance portion 216a on the first wall 216 that is lower in the gravity direction to form the avoidance space 34, the portion of the electrode assembly 22 that is lower in the gravity direction can be more effectively protected.

[0113] Figure 10 A perspective view of the housing of the battery cell provided by some possible embodiments of the present application is shown.

[0114] Without loss of generality, the following gives an example of a possible housing of the battery cell 20 provided by the embodiments of the present application. As Figure 10 shown in (a) of, the main body portion 216b of the first wall 216 and the inner surface and / or outer surface of the avoidance portion 216a may not be smoothly connected. For example, Figure 10 in, the projection of the connection between the main body portion 216b and the avoidance portion 216a in the stacking direction of the electrode tabs has a corner. This non-smooth connection method is relatively simple to process. When the outer surfaces of the main body portion 216b and the avoidance portion 216a are not smoothly connected, the battery cell 20 can be fixed by providing a structure complementary to the contour of the connection on the inner wall of the housing 11 of the battery 10.

[0115] As Figure 10As shown in (b) therein, the main body portion 216b and the avoidance portion 216a of the first wall 216 can be connected by a rounded corner. Optionally, the inner surface and / or the outer surface of the main body portion 216b and the avoidance portion 216a can be smoothly connected by a rounded corner. When the inner surfaces of the main body portion 216b and the avoidance portion 216a are smoothly connected by a rounded corner, the damage caused by the collision and scratching between the end of the electrode assembly 22 and the first wall 216 is smaller.

[0116] As Figure 10 shown in (c) therein, the avoidance portion 216a and the second wall 217 can be connected by a rounded corner. The smooth connection of the avoidance portion 216a and the second wall 217 by a rounded corner can reduce the damage to the box body 11 and the outer shell 21 caused by scratching between the outer shell 21 and the box body 11 of the battery 10 during use.

[0117] Optionally, the inner surface and / or the outer surface of the avoidance portion 216a can be a curved surface.

[0118] As Figure 10 shown in (d) therein, the extending direction of the avoidance portion 216a of the first wall 216 may be variable. For example, it extends in a direction with a larger included angle with the first direction at a position far from the second wall 217, and the included angle between the extending direction and the first direction is reduced at a position close to the second wall 217. In some cases, there may be a case where the included angle between the extending direction and the first direction is 0°. For example Figure 10 in (d) therein, there may be a plane or other structure extending along the first direction between the avoidance portion 216a and the second wall 217. In this case, it does not conflict with the concept of the present application, so it should also be regarded as an implementation manner of the embodiment of the present application and be protected. At this time, it can be understood that the avoidance portion 216a is connected to the second wall 217 through a chamfer or a transition surface, etc. Reducing the included angle between the extending direction and the first direction at a position close to the second wall 217 can enable the battery cell 20 to contact the box body 11 with a relatively gentle structure, which is beneficial to the placement stability of the battery cell 20 in the box body 11.

[0119] As Figure 10 shown in (e) therein, the first wall 216 can be multiple walls, so as to provide multi-directional deflection protection for the end of the electrode assembly 22. For example, Figure 10 in the outer shell 21 in (e) therein, when the wall with the largest surface area of the battery cell 20 is the first wall 216, the avoidance space 34 can protect the surface of the electrode tab, thereby avoiding damage to the insulating layer.

[0120] As Figure 10 shown in (f) therein, the second wall 217 can be provided with a sunk platform, and the sunk platform does not affect the avoidance space 34 for accommodating the end of the electrode assembly.

[0121] In the possible examples of the above embodiments, without contradiction, it can also be adaptively applied to Figure 7 the design of the battery cells.

[0122] The above examples are only exemplary, and the embodiments of the present application are not limited thereto.

[0123] Figure 11 The structural schematic diagram of the battery provided by an embodiment of the present application is shown.

[0124] As Figure 11 shown in the battery, the battery may include the battery cells 20 in the above embodiments, and the number of the battery cells 20 is not limited. These battery cells 20 may be arranged into a battery pack, and these battery cells 20 may also be arranged with conventional battery cells. The present application does not limit this. These battery cells 20 may be arranged in the stacking direction or the first direction of the electrode plates. Since the battery cells 20 may be flat surfaces in these directions, it does not affect the arrangement density and does not affect the energy density of the battery.

[0125] Figure 12 The schematic front view of the battery provided by an embodiment of the present application is shown.

[0126] As Figure 12 shown in the battery, the battery may include a box body 11 and a fixing part 350. Among them, the fixing part 350 is arranged on the inner wall of the box body 11. The shape of the fixing part 350 may cooperate with the shape of the avoiding part 216a to fix the battery cell 20.

[0127] The cooperation between the shape of the fixing part 350 and the shape of the avoiding part 216a can be understood as that the shape of the fixing part 350 is at least partially complementary to the shape of the avoiding part 216a. For example Figure 12 in the fixing part 350 is trapezoidal, and the two sides of the trapezoid can be complementary to the avoiding parts 216a on both sides of the battery cell 20 at the same time. As another possible design, the fixing part 350 may also be triangular, parallelogram, rectangular, etc. The present application does not limit this. The fixing part 350 may also only cooperate with the avoiding part 216a on one side. The present application is not limited thereto.

[0128] Figure 12 In, an example in which the fixing part 350 is arranged at the bottom of the box body 11 is exemplarily given. The fixing part 350 may also be arranged at other parts of the box body 11, such as the side wall of the box body 11. The position of the fixing part 350 in the box body 11 may be set according to the position of the avoiding part 216a of the battery cell 20. The present application does not limit this.

[0129] Figure 13 The schematic front view of the battery provided by another embodiment of the present application is shown.

[0130] As shown Figure 13 As shown, a cavity is formed between the avoidance portion 216a and the main body portion 216b and the box body 11, and at least a part of the cooling mechanism 351 is located in the cavity. The shape design of the irregular battery cells reserves space for the arrangement of the cooling mechanism 351 and the wiring. The cooling mechanism 351 or the wiring, etc. can also be arranged in or at the position of the fixing portion 350, and the present application does not limit this. The number of the cooling mechanisms 351 shown in the figure is multiple, but the cooling mechanisms 351 or the wiring can also be arranged centrally, and the embodiments of the present application are not limited thereto.

[0131] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing (21), the housing (21) including a first wall (216) and a second wall (217) adjacent to the first wall (216), the first wall (216) including a main body portion (216b) extending in a first direction, the first wall (216) further including an avoidance portion (216a), an inner surface of the avoidance portion (216a) being connected to an inner surface of the main body portion (216b), and the inner surface of the avoidance portion (216a) extending towards the outside of the housing (21) to the second wall (217) to form an avoidance space (34) with the second wall (217); An electrode assembly (22), the electrode assembly (22) being accommodated within the housing (21); Wherein, the first direction is perpendicular to the stacking direction of the electrode plates of the electrode assembly (22), the second wall (217) is perpendicular to the first direction, the extending direction of the avoidance portion (216a) forms an acute angle with the first direction, and an end portion of the electrode assembly (22) is accommodated within the avoidance space (34).

2. The battery cell according to claim 1, wherein An outer surface of the avoidance portion (216a) is connected to an outer surface of the main body portion (216b), and the outer surface of the avoidance portion (216a) extends in a direction forming an acute angle with the first direction and towards the outside of the housing (21).

3. The battery cell according to claim 1, wherein The outer surface of the avoidance portion (216a) is flush with the outer surface of the main body portion (216b), and the thickness of the avoidance portion (216a) gradually decreases along the first direction.

4. The battery cell according to claim 3, wherein The thickness of the thinnest part of the avoidance portion (216a) is 0.2 mm to 1.5 mm, and the thickness of the main body portion (216b) is 1.5 mm to 5 mm.

5. The battery cell according to any one of claims 2 to 4, wherein The maximum dimension d1 and the minimum dimension d2 of the positive projection of the housing (21) in the stacking direction along a second direction satisfy: 0.8 ≤ d2 / d1 ≤ 0.99, Wherein, the second direction is perpendicular to the first direction and the stacking direction.

6. The battery cell according to any one of claims 2 to 4, wherein The dimension d3 of the positive projection of the avoidance portion (216a) in the stacking direction along the first direction ranges from 1 cm to 10 cm, and the dimension d4 of the positive projection of the avoidance portion (216a) in the stacking direction along a second direction ranges from 0.2 mm to 5 cm, Wherein, the second direction is perpendicular to the first direction and the stacking direction.

7. The battery cell according to any one of claims 2 to 4, characterized in that, The dimension d3 of the positive projection of the avoidance portion (216a) in the stacking direction along the first direction and the dimension d5 of the positive projection of the main body portion (216b) in the stacking direction along the first direction satisfy 0.01 ≤ d3 / d5 ≤ 0.

2.

8. The battery cell according to any one of claims 1 to 4, characterized in that, The electrode assembly (22) includes a negative electrode plate, The negative electrode plate is accommodated within the avoidance space (34).

9. The battery cell according to claim 8, wherein The electrode assembly (22) further includes a positive electrode plate, The positive electrode sheet and the negative electrode sheet are received in the avoidance space (34).

10. The battery cell according to any one of claims 1 to 4, characterized in that The first wall (216) is the bottom wall of the outer shell (21).

11. The battery cell according to any one of claims 1 to 4, characterized in that, The included angle range between the extending direction of the avoidance portion (216a) and the first direction is from 1° to 30°.

12. The battery cell according to any one of claims 1 to 4, characterized in that, The inner surface of the avoidance portion (216a) and the inner surface of the main body portion (216b) are connected by a fillet.

13. The battery cell according to any one of claims 1 to 4, characterized in that, The battery cell (20) further includes two electrode terminals (214). The two electrode terminals (214) are disposed on the same side or both sides in the length direction of the battery cell (20). The outer shell (21) includes a cover plate (212), and a pressure relief mechanism (213) is provided on the cover plate (212) or the first wall (216).

14. The battery cell according to claim 13, wherein The battery cell (20) further includes a first fixing member (32). The first fixing member (32) is disposed on the side of the cover plate (212) facing the electrode assembly (22). The first fixing member (32) is detachably connected to a second fixing member (33), and the second fixing member (33) is used to fix the tab (222) of the electrode assembly (22).

15. The battery cell according to any one of claims 1 to 4, characterized in that, The battery cell (20) further includes: A third fixing member (31). The third fixing member (31) is oppositely disposed on both sides of the electrode assembly (22) along a second direction, and the third fixing member (31) is fixedly connected to the electrode assembly (22), wherein the second direction is perpendicular to the first direction and the stacking direction.

16. A battery, characterized in that, Including: A box body (11) and a plurality of battery cells as described in any one of claims 1 to 15 wherein a plurality of the battery cells (20) are received in the box body (11), and the plurality of battery cells (20) are arranged along the stacking direction or the first direction.

17. The battery according to claim 16, characterized in that, The battery further includes: A fixing portion (350) wherein the fixing portion (350) is disposed on the inner wall of the box body (11), and the shape of the fixing portion (350) is at least partially complementary to the shape of the avoidance portion (216a) to fix the battery cell (20).

18. The battery according to claim 16 or 17, characterized in that, The battery further includes: A cooling mechanism (351) wherein a cavity is formed between the avoidance portion (216a) and the main body portion (216b) and the box body (11), and at least a part of the cooling mechanism (351) is located in the cavity.

19. An electrical device, characterized in that, Including the battery as described in any one of claims 16 to 18, and the battery is used to supply electrical energy to the electrical equipment.

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