Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, a first electrode terminal and a second electrode terminal, the housing has a first wall in a first direction, the housing has a second wall and a third wall opposite to each other in a second direction, and the first direction and the second direction are perpendicular to each other. The polarity of the second electrode terminal is opposite to that of the first electrode terminal. Wherein the first wall comprises a first part and a second part which are mutually arranged along a second direction, the second wall is connected with the first part, the third wall is connected with the second part, the second part protrudes out of the first part along the direction from the inner side of the first wall to the outer side of the first wall, and the first electrode terminal and the second electrode terminal are respectively arranged on the first part. According to the technical scheme provided by the invention, the charge-discharge performance of the battery can be effectively improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, how to improve the charge and discharge performance of batteries is a technical problem that urgently needs to be solved in battery technology. Summary of the Utility Model

[0004] The present application provides a battery cell, a battery, and an electrical device, and the technical solution provided by the present application can effectively improve the charge and discharge performance of the battery.

[0005] The present application is implemented through the following technical solutions:

[0006] In a first aspect, some embodiments of the present application provide a battery cell. The battery cell includes a housing, a first electrode terminal, and a second electrode terminal. The housing has a first wall in a first direction and has a second wall and a third wall opposite to each other in a second direction, and the first direction and the second direction are perpendicular to each other. The second electrode terminal has a polarity opposite to that of the first electrode terminal. Wherein, the first wall includes a first part and a second part arranged in the second direction, the second wall is connected to the first part, the third wall is connected to the second part, and along the direction from the inner side of the first wall to the outer side of the first wall, the second part protrudes from the first part, and the first electrode terminal and the second electrode terminal are respectively arranged on the first part.

[0007] In the above solution, by setting the second part to protrude outward relative to the first part, a groove is formed at the junction of the first wall and the second wall, and the first electrode terminal and the second electrode terminal are arranged on the first part. On the one hand, it can make the current flow path inside the battery cell shorter, reduce the internal resistance of the battery cell, thereby improving the charge and discharge performance of the battery cell, and further facilitating the improvement of the charge and discharge performance of the battery. On the other hand, it can protect the first electrode terminal and the second electrode terminal and reduce the impact of external shocks on the electrode terminals, thereby facilitating the improvement of the reliability of the battery cell and further facilitating the improvement of the battery reliability. On the third hand, compared with other positions on the first wall relative to the groove, forming a groove at the junction of the first wall and the second wall makes the first wall have a larger flat area, so that other structural components can be effectively arranged outside the first wall. At the battery level, it is conducive to the improvement of structural stability and further conducive to the improvement of the battery reliability. On the fourth hand, at the battery level, the busbar component can easily electrically connect two battery cells arranged along the second direction, reduce the difficulty of grouping battery cells, and facilitate the improvement of battery manufacturing efficiency.

[0008] According to some embodiments of the present application, along the second direction, the size of the first wall is L1, and the size of the first part is L2, satisfying that L2 / L1 is less than or equal to 1 / 3.

[0009] In the above solution, by limiting the size of the first part along the second direction to be less than or equal to 1 / 3 of the size of the first wall along the second direction, on the one hand, it can effectively shorten the distance between the first electrode terminal and the second electrode terminal, reduce the length of the current flowing through inside the battery cell, and facilitate the improvement of the charge and discharge performance of the battery cell. On the other hand, it can make the size of the second part larger, so that other structural components can be effectively arranged outside the first wall, which is conducive to the improvement of the battery reliability.

[0010] According to some embodiments of the present application, along the direction from the inside of the first wall to the outside of the first wall, the first electrode terminal does not extend beyond the second part, and the second electrode terminal does not extend beyond the second part.

[0011] In the above solution, by setting the first electrode terminal and the second electrode terminal not to exceed the second part, it can effectively reduce the influence of external structural components on the electrode terminals, improve the reliability of the battery cell, and further facilitate the improvement of the battery reliability.

[0012] According to some embodiments of the present application, the outer casing includes a housing, a cover body, and a third wall. The housing includes a second part, a fourth wall, and two fifth walls. The second part and the fourth wall are oppositely arranged in a first direction, and the two fifth walls are oppositely arranged in a third direction. The first direction, the second direction, and the third direction are perpendicular to each other in pairs. Along the second direction, a first opening is formed at one end of the housing, and a second opening is formed at the other end of the housing. The cover body closes the first opening. The cover body includes a second wall, a first part, and a third part. The third part connects the first part and the second part. The third wall closes the second opening.

[0013] In the above solution, by setting the outer casing to include a housing, a cover body, and a third wall that are of a split structure with each other, it is convenient for the assembly of the first electrode terminal, the second electrode terminal, and the electrode assembly, effectively improving the assembly efficiency of the battery cell, so that the manufacturing efficiency of the battery cell is high, and further the manufacturing efficiency of the battery is high.

[0014] According to some embodiments of the present application, the size of the outer casing in the second direction is greater than the size of the outer casing in the first direction, and the size of the outer casing in the first direction is greater than the size of the outer casing in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0015] In the above solution, by setting the size of the outer casing in the third direction to be smaller than the size in the first direction, and setting the size of the outer casing in the first direction to be smaller than the size in the second direction, the outer casing is roughly in a blade shape, which is beneficial to improving the grouping efficiency of the battery cell and the volumetric energy density of the battery.

[0016] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is arranged on the second wall.

[0017] In the above solution, by providing the pressure relief mechanism, the internal pressure of the battery cell can be released, reducing the risk of the battery cell exploding due to thermal runaway, making the battery have high reliability. At the same time, the pressure relief mechanism is arranged on the second wall, which can reduce the occupation of the space where the electrode terminal is located by the pressure relief mechanism, reduce the influence of the pressure relief mechanism on the grouping efficiency of the battery cell, and can effectively improve the volumetric energy density of the battery.

[0018] In a second aspect, some embodiments of the present application further provide a battery, which includes a box body and the battery cell provided in the first aspect. An assembly cavity is provided inside the box body, and the battery cell is arranged in the assembly cavity.

[0019] In the above solution, since the battery includes the battery cells provided in the first aspect, on the one hand, due to the low internal resistance of the battery cells, the charge and discharge performance of the battery is high; on the other hand, since other structural components such as heat management components and flexible circuit boards can be effectively arranged outside the first wall, the reliability of the battery is high; on the third hand, since the busbar component can conveniently connect two adjacent battery cells, the manufacturing efficiency of the battery is high.

[0020] According to some embodiments of the present application, the battery further includes a busbar component. Two adjacent battery cells are electrically connected through the busbar component. Along the direction from the inner side of the first wall to the outer side of the first wall, the busbar component does not protrude beyond the second part.

[0021] In the above solution, setting the busbar component not to exceed the second part can effectively reduce the influence of external structural components on the busbar component, reduce the risk of the busbar component falling off, and is conducive to improving the reliability of the battery.

[0022] According to some embodiments of the present application, the battery further includes a connecting beam. The connecting beam is disposed in the assembly cavity and divides the assembly cavity into a first chamber and a second chamber arranged along the second direction. The first chamber is provided with a first battery cell group, the second chamber is provided with a second battery cell group, the first battery cell group and the second battery cell group are respectively connected to the connecting beam. The first battery cell group includes a plurality of battery cells stacked on each other along the third direction, the second battery cell group includes a plurality of battery cells stacked on each other along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0023] In the above solution, by respectively arranging the first battery cell group and the second battery cell group in the first chamber and the second chamber and respectively connecting them to the connecting beam, on the one hand, the battery structure can be made stable, the overall structural strength is high, which is conducive to improving the reliability of the battery; on the other hand, the energy density and capacitance of the battery can be effectively improved to meet the power consumption requirements.

[0024] According to some embodiments of the present application, along the second direction, the third wall of each battery cell is respectively disposed away from the connecting beam.

[0025] In the above solution, by disposing the third wall of each battery cell away from the connecting beam, the arrangement postures of each battery cell can be made consistent, which is conducive to the busbar component to electrically connect two adjacent battery cells, reduces the arrangement difficulty of the busbar component, and is conducive to improving the manufacturing efficiency of the battery.

[0026] According to some embodiments of the present application, the battery further includes a first busbar component. The connecting beam is formed with a first through hole penetrating along the second direction, and the first through hole is for the first busbar component to pass through so that the first busbar component electrically connects the first battery cell group and the second battery cell group.

[0027] In the above solution, by providing a first through hole in the connecting beam for the first current collecting component to pass through, the first battery cell group and the second battery cell group can be effectively electrically connected, which is beneficial to improving the battery manufacturing efficiency.

[0028] According to some embodiments of the present application, an air flow channel is formed inside the connecting beam. Along the second direction, a first opening and a second opening are respectively formed on two opposite surfaces of the connecting beam. The first opening communicates the air flow channel and the first chamber, and the second opening communicates the air flow channel and the second chamber.

[0029] In the above solution, by providing an air flow channel inside the connecting beam and respectively providing a first opening and a second opening on both sides of the connecting beam, the gas in the box can be collected, so that the air pressure in the box is balanced, which is beneficial to improving the battery reliability.

[0030] According to some embodiments of the present application, the battery further includes a thermal management component. Along the first direction, the thermal management component is arranged on the same side as the second part and is used for heat exchange with the battery cell.

[0031] In the above solution, by arranging the thermal management component on the same side as the second part, the temperature of the battery cell can be effectively adjusted, the risk of thermal runaway of the battery cell can be reduced, and the reliability of the battery can be improved.

[0032] In a third aspect, some embodiments of the present application further provide an electrical device, which includes the battery cell provided in the first aspect and / or the battery provided in the second aspect.

[0033] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained according to these drawings without creative efforts.

[0035] Figure 1 Schematic diagram of a vehicle in some embodiments of the present application;

[0036] Figure 2 Stereo explosion view of a battery in some embodiments of the present application;

[0037] Figure 3 Stereo view of a battery cell in some embodiments of the present application;

[0038] Figure 4 It is a partial enlarged view of a battery cell in some embodiments of the present application;

[0039] Figure 5 It is a side view of a battery cell in some embodiments of the present application;

[0040] Figure 6 It is an exploded perspective view of a housing in some embodiments of the present application;

[0041] Figure 7 It is a schematic diagram of a partial structure of a battery in some embodiments of the present application;

[0042] Figure 8 It is a schematic diagram of a battery cell and a busbar component in some embodiments of the present application;

[0043] Figure 9 It is an exploded perspective view of a partial structure of a battery in some embodiments of the present application;

[0044] Figure 10 It is a schematic diagram of a battery cell, a connecting beam and a first busbar component in some embodiments of the present application;

[0045] Figure 11 It is a schematic diagram of a connecting beam in some embodiments of the present application;

[0046] Figure 12 It is a schematic diagram of a partial structure of a battery in some other embodiments of the present application.

[0047] Reference numerals: 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 20 - box body; 21 - first box body part; 22 - second box body part; 23 - first chamber; 24 - second chamber; 30 - busbar component; 31 - first busbar component; 40 - connecting beam; 41 - first through hole; 42 - first opening; 43 - second opening; 44 - third opening; 50 - first battery cell group; 60 - second battery cell group; 70 - thermal management component;

[0048] 10 - battery cell; 11 - housing; 11a - shell; 11b - cover; 110 - first wall; 1100 - first part; 1101 - second part; 1102 - third part; 111 - second wall; 112 - third wall; 113 - fourth wall; 114 - fifth wall; 12 - first electrode terminal; 13 - second electrode terminal; 14 - pressure relief mechanism; z - first direction; x - second direction; y - third direction. Detailed embodiments

[0049] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and above-mentioned drawings of this application are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0052] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: there is A, there is both A and B, and there is B. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of 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. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "mount", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0057] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell can be in the shape of a cuboid or other shapes, and the embodiments of the present application also do not limit this. 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. The battery 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.

[0058] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement (such as insertion and extraction) of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate 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 positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode tab. 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 plate 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 negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that large currents can pass through without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. 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. In some embodiments, the battery further includes a housing, a positive electrode terminal, and a negative electrode terminal. The electrolyte and the electrolyte are disposed inside the housing. The positive electrode terminal and the negative electrode terminal are respectively disposed on the wall of the housing. The positive electrode terminal is connected to the positive electrode tab, and the negative electrode terminal is connected to the negative electrode tab to realize the input and output of electrical energy. In some embodiments, the electrode terminal includes a pole column.

[0059] The development of battery technology needs to consider multiple design factors simultaneously. For example, parameters such as energy density, cycle life, and discharge capacity. In addition, the charge and discharge performance of the battery also needs to be considered. Currently, the battery cell mainly adopts the scheme of side-out pole columns, that is, the positive pole column and the negative pole column are respectively disposed on both sides of the housing. Since the pole columns are located at both ends of the battery, the length of the current flow is relatively long, the internal resistance of the battery cell is relatively large, and the temperature rise of the battery cell is relatively fast, resulting in poor charge and discharge performance of the battery.

[0060] In view of this, to improve the problem that the internal resistance of the battery cell is too large and affects the charge and discharge performance of the battery, some embodiments of the present application provide a battery cell, which includes a housing, a first electrode terminal, and a second electrode terminal. The housing has a first wall in a first direction, and the housing has a second wall and a third wall opposite to each other in a second direction, and the first direction and the second direction are perpendicular to each other. The polarity of the second electrode terminal is opposite to that of the first electrode terminal. Among them, the first wall includes a first part and a second part arranged along the second direction, the second wall is connected to the first part, the third wall is connected to the second part, and along the direction from the inner side of the first wall to the outer side of the first wall, the second part protrudes from the first part, and the first electrode terminal and the second electrode terminal are respectively arranged on the first part.

[0061] In the above solution, by setting the second part to protrude outward relative to the first part, a groove is formed at the intersection of the first wall and the second wall, and the first electrode terminal and the second electrode terminal are arranged on the first part. On the one hand, it can make the length of the current flowing through the battery cell shorter, reduce the internal resistance of the battery cell, thereby improving the charge and discharge performance of the battery cell, and further facilitating the improvement of the charge and discharge performance of the battery. On the other hand, it can protect the first electrode terminal and the second electrode terminal, reduce the influence of external impact on the electrode terminals, thereby facilitating the improvement of the reliability of the battery cell, and further facilitating the improvement of the battery reliability; on the other hand, compared with the groove being located at other positions of the first wall, forming a groove at the intersection of the first wall and the second wall makes the first wall have a larger flat area, so as to be able to effectively arrange other structural parts on the outer side of the first wall. At the battery level, it is conducive to the improvement of structural stability, and further conducive to the improvement of the battery reliability; on the other hand, at the battery level, the busbar component can easily electrically connect two battery cells arranged along the second direction, reduce the difficulty of battery cell grouping, and facilitate the improvement of battery manufacturing efficiency.

[0062] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using the batteries.

[0063] 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 new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a range-extended 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 drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not make special restrictions on the above electrical devices.

[0064] For the convenience of description, the following embodiments will take an electric device as a vehicle as an example for illustration.

[0065] Figure 1 It is a schematic diagram of a vehicle in some embodiments of the present application.

[0066] Inside the vehicle 1000, a controller 200, a motor 300, and a battery 100 can be arranged. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000 but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] Please refer to Figure 2 , Figure 2 It is a three-dimensional exploded view of the battery 100 in some embodiments of the present application.

[0068] The battery 100 includes battery cells 10 and a box body 20, and the battery cells 10 are accommodated in the box body 20. Among them, the box body 20 is used to provide an accommodation space for the battery cells 10, and the box body 20 can adopt various structures. In some embodiments, the box body 20 can include a first box body part 21 and a second box body part 22. The first box body part 21 and the second box body part 22 are covered with each other, and the first box body part 21 and the second box body part 22 jointly define an accommodation space for accommodating the battery cells 10. The second box body part 22 can be a hollow structure with one end open, and the first box body part 21 can be a plate-like structure. The first box body part 21 covers the open side of the second box body part 22 so that the first box body part 21 and the second box body part 22 jointly define an accommodation space; the first box body part 21 and the second box body part 22 can also both be hollow structures with one side open, and the open side of the first box body part 21 covers the open side of the second box body part 22. Of course, the box body 20 formed by the first box body part 21 and the second box body part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0069] In the battery 100, the number of battery cells 10 can be one or more, and each battery cell 10 can be fixed to the box body 20 through a connecting member (such as a bolt), or each battery cell 10 can be fixed to the box body 20 by bonding.

[0070] In some embodiments, the battery cells 10 in the battery box 20 can be electrically connected through a busbar component 30, so that the battery cells 10 in the battery box 20 are connected in series, parallel or in a hybrid connection with each other.

[0071] Exemplarily, a plurality of groups of battery cells 10 are provided in the battery box 20. Each group of battery cells 10 includes a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series with each other through a busbar component 30. The plurality of groups of battery cells 10 are connected in series with each other through a busbar component 30.

[0072] Some embodiments of the present application provide a battery cell 10. Please refer to Figures 3 - 5 , Figure 3 which is a perspective view of the battery cell 10 in some embodiments of the present application, Figure 4 which is a partially enlarged view of the battery cell 10 in some embodiments of the present application, Figure 5 which is a side view of the battery cell 10 in some embodiments of the present application.

[0073] The battery cell 10 includes a housing 11, a first electrode terminal 12 and a second electrode terminal 13. The housing 11 has a first wall 110 in a first direction z, and the housing 11 has a second wall 111 and a third wall 112 opposite to each other in a second direction x. The first direction z and the second direction x are perpendicular to each other. The second electrode terminal 13 has a polarity opposite to that of the first electrode terminal 12. Wherein, the first wall 110 includes a first part 1100 and a second part 1101 arranged along the second direction x. The second wall 111 is connected to the first part 1100, and the third wall 112 is connected to the second part 1101. Along the direction from the inner side of the first wall 110 to the outer side of the first wall 110, the second part 1101 protrudes from the first part 1100, and the first electrode terminal 12 and the second electrode terminal 13 are respectively arranged on the first part 1100.

[0074] An accommodation cavity is formed inside the housing 11, and an electrode assembly and an electrolyte are arranged in the accommodation cavity. In some embodiments, the housing 11 includes a housing body 11a and a cover body 11b. The housing body 11a is formed with an opening, and the electrode assembly can be placed into the housing body 11a through the opening of the housing body 11a. The cover body 11b is connected to the housing body 11a and closes the opening so that the electrode assembly is in a closed accommodation cavity. In some embodiments, a liquid injection hole can be provided on the wall of the housing 11, and the electrolyte can be injected into the accommodation cavity through the liquid injection hole. The connection relationship between the cover body 11b and the housing body 11a includes but is not limited to riveting, welding or connection with a threaded member.

[0075] The housing 11 can be square. The first wall 110 is a wall portion of the housing 11 in the first direction z. The second wall 111 and the third wall 112 are two wall portions of the housing 11 opposite to each other in the second direction x. The two ends of the first wall 110 in the second direction x are respectively connected to the second wall 111 and the third wall 112.

[0076] The first wall 110 includes a first part 1100 and a second part 1101 arranged along the second direction x. The first part 1100 is connected to the second wall 111, and the second part 1101 is connected to the third wall 112.

[0077] "In the direction from the inner side of the first wall 110 to the outer side of the first wall 110, the second part 1101 protrudes from the first part 1100" can be understood as that the first part 1100 is recessed towards the inside of the housing 11 compared with the second part 1101, so as to form a groove at the junction of the first wall 110 and the second wall 111. The groove penetrates in the third direction y and penetrates in the direction from the third wall 112 to the second wall 111. The first direction z, the second direction x and the third direction y are perpendicular to each other in pairs.

[0078] In some embodiments, the first part 1100 and the second part 1101 can be connected by a third part 1102. Exemplarily, one end of the third part 1102 is perpendicularly connected to the first part 1100, and the other end of the third part 1102 is perpendicularly connected to the second part 1101.

[0079] "The first electrode terminal 12 and the second electrode terminal 13 are respectively arranged on the first part 1100" can be understood as that the positive electrode terminal and the negative electrode terminal are both assembled on the first part 1100. The first electrode terminal 12 is assembled on the first part 1100 and connected to the tab of the corresponding polarity, and the second electrode terminal 13 is assembled on the first part 1100 and connected to the tab of the corresponding polarity.

[0080] In some embodiments, the first electrode terminal 12 and the second electrode terminal 13 can be arranged side by side along the second direction x.

[0081] Exemplarily, taking the first direction z as the height direction of the battery cell 10, the second direction x as the length direction of the battery cell 10, and the third direction y as the thickness direction of the battery cell 10, the battery cell 10 has a first wall 110 and a fourth wall 113 opposite to each other in the first direction z, a second wall 111 and a third wall 112 opposite to each other in the second direction x, and two fifth walls 114 opposite to each other in the third direction y. The first wall 110 and the fourth wall 113 can be wall portions with a longer length, the fifth wall 114 can be a wall portion with a larger surface area, and the second wall 111 and the third wall 112 are wall portions with a smaller surface area. The second part 1101, the two fifth walls 114, and the fourth wall 113 are connected end to end to jointly form a housing 11a. At both ends of the housing 11a in the second direction x, a first opening 42 and a second opening 43 are formed. The second wall 111, the first part 1100, and the third part 1102 are connected to each other and jointly form a cover 11b. The first electrode terminal 12 and the second electrode terminal 13 are assembled on the first part 1100 of the cover 11b and jointly form a cover 11b assembly. The electrode assembly is placed into the housing 11a through the second opening 43, the cover 11b assembly closes the first opening 42, the first electrode terminal 12 and the second electrode terminal 13 are respectively connected to the tabs with corresponding polarities, and the third wall 112 closes the second opening 43.

[0082] Exemplarily, at the battery 100 level, the battery cells 10 are stacked on top of each other. There can be two battery cells 10 stacked on top of each other in the second direction x. The third walls 112 of the two battery cells 10 are arranged to face away from each other, and the grooves between the two battery cells 10 are arranged to face each other. One end of the current collector member 30 can be connected to the first electrode terminal 12 of one of the battery cells 10, and the other end of the current collector member 30 can be connected to the second electrode terminal 13 of the other battery cell 10.

[0083] In the above solution, by setting the second part 1101 to protrude outward relative to the first part 1100, a groove is formed at the junction of the first wall 110 and the second wall 111, and the first electrode terminal 12 and the second electrode terminal 13 are arranged on the first part 1100. On the one hand, it can make the internal current flow path of the battery cell 10 shorter, reduce the internal resistance of the battery cell 10, thereby improving the charge and discharge performance of the battery cell 10, and further facilitating the improvement of the charge and discharge performance of the battery 100. On the other hand, it can protect the first electrode terminal 12 and the second electrode terminal 13, reduce the impact of external shocks on the electrode terminals, thereby facilitating the improvement of the reliability of the battery cell 10, and further facilitating the improvement of the reliability of the battery 100. On the other hand, compared with other positions of the first wall 110 where the groove is located, forming a groove at the junction of the first wall 110 and the second wall 111 makes the first wall 110 have a larger flat area, so that other structural components can be effectively arranged on the outside of the first wall 110. At the battery 100 level, it is conducive to improving the structural stability, and further conducive to improving the reliability of the battery 100. Exemplarily, a thermal management component 70 can be effectively arranged on the outside of the first wall 110, which is conducive to the management of the temperature of the battery cell 10. At the battery 100 level, it is conducive to improving the temperature consistency of the battery cell 10. On the other hand, at the battery 100 level, the busbar component 30 can easily electrically connect two battery cells 10 arranged along the second direction x, reduce the grouping difficulty of the battery cells 10, and facilitate the improvement of the manufacturing efficiency of the battery 100.

[0084] In some embodiments, compared with the groove being located in the middle of the first wall 110, forming a groove at the junction of the first wall 110 and the second wall 111 can reduce the impact on the structural strength of the housing 11 due to the formation of the groove, making the battery 100 highly reliable.

[0085] According to some embodiments of the present application, please refer to Figure 5 , along the second direction x, the size of the first wall 110 is L1, and the size of the first part 1100 is L2, satisfying that L2 / L1 is less than or equal to 1 / 3.

[0086] In some embodiments, the size of the first wall 110 in the second direction x is L1, and the size of the first part 1100 in the second direction x is L2. The value of the ratio of L2 to L1 can be 1 / 3, 1 / 4, 1 / 5, 1 / 6, a smaller value, or any value between two adjacent values.

[0087] In the above solution, the dimension of the first part 1100 in the second direction x is defined to be less than or equal to 1 / 3 of the dimension of the first wall 110 in the second direction x. On the one hand, this can effectively shorten the distance between the first electrode terminal 12 and the second electrode terminal 13, reduce the length of the current flowing through the inside of the battery cell 10, and is conducive to improving the charge and discharge performance of the battery cell 10. On the other hand, it can make the dimension of the second part 1101 larger so that external structural components can be effectively arranged outside the first wall 110, which is conducive to improving the reliability of the battery 100.

[0088] According to some embodiments of the present application, along the direction from the inside of the first wall 110 to the outside of the first wall 110, the first electrode terminal 12 does not extend beyond the second part 1101, and the second electrode terminal 13 does not extend beyond the second part 1101.

[0089] In some embodiments, the first electrode terminal 12 can protrude from the first part 1100, and the first electrode terminal 12 does not protrude beyond the second part 1101. Exemplarily, the surface of the first electrode terminal 12 facing away from the inside of the battery cell 10 is flush with the outer side surface of the second part 1101, or the surface of the first electrode terminal 12 facing away from the inside of the battery cell 10 is closer to the first part 1100 relative to the outer side surface of the second part 1101.

[0090] In some embodiments, the second electrode terminal 13 can protrude from the first part 1100, and the second electrode terminal 13 does not protrude beyond the second part 1101. Exemplarily, the surface of the second electrode terminal 13 facing away from the inside of the battery cell 10 is flush with the outer side surface of the second part 1101, or the surface of the second electrode terminal 13 facing away from the inside of the battery cell 10 is closer to the first part 1100 relative to the outer side surface of the second part 1101.

[0091] In the above solution, setting the first electrode terminal 12 and the second electrode terminal 13 not to exceed the second part 1101 can effectively reduce the influence of external structural components on the electrode terminals, improve the reliability of the battery cell 10, and thus is conducive to the reliability of the battery 100.

[0092] According to some embodiments of the present application, please refer to Figure 6 , Figure 6 which is an exploded perspective view of the housing 11 in some embodiments of the present application.

[0093] The housing 11 includes a shell 11a, a cover 11b and a third wall 112. The shell 11a includes a second portion 1101, a fourth wall 113 and two fifth walls 114. The second portion 1101 and the fourth wall 113 are arranged opposite to each other along a first direction z. The two fifth walls 114 are arranged opposite to each other along a third direction y. The first direction z, the second direction x and the third direction y are mutually perpendicular. Along the second direction x, a first opening 42 is formed at one end of the shell 11a, and a second opening 43 is formed at the other end of the shell 11a. The cover 11b closes the first opening 42. The cover 11b includes a second wall 111, a first portion 1100 and a third portion 1102. The third portion 1102 connects the first portion 1100 and the second portion 1101. The third wall 112 closes the second opening 43.

[0094] The housing 11 may be composed of a plurality of structural parts. In some embodiments, the housing 11 includes a housing 11a, a cover 11b, and a third wall 112, which are separate structures from each other. The housing 11a may form a first opening 42 and a second opening 43, and the electrode assembly may be placed in the housing 11a through the first opening 42, or may be placed in the housing 11a through the second opening 43. The cover 11b closes the first opening 42, and the third wall 112 closes the second opening 43.

[0095] In some embodiments, the housing 11a includes a second portion 1101, a fourth wall 113 and two fifth walls 114. Along the circumference of the second opening 43, the second portion 1101, the fourth wall 113 and the two fifth walls 114 are connected to each other to form the housing 11a, and the first opening 42 and the second opening 43 are formed in the second direction x. The housing 11a can be integrally formed or integrated by welding, bonding or screw connection. The cover 11b includes a second wall 111, a first portion 1100 and a third portion 1102. The second wall 111, the first portion 1100 and the third portion 1102 can be integrally formed or integrated by welding, bonding or screw connection. The cover 11b closes the first opening 42, the end of the second wall 111 away from the first portion 1100 along the first direction z is connected to the fourth wall 113, and the opposite ends of the second wall 111 along the third direction y are respectively connected to the two fifth walls 114. The opposite ends of the first part 1100 along the third direction y are respectively connected to the two fifth walls 114. The end of the third part 1102 away from the first part 1100 along the first direction z is connected to the second part 1101, and the opposite ends of the third part 1102 along the third direction y are respectively connected to the two fifth walls 114. The edges of the third wall 112 are respectively connected to the second part 1101, the fourth wall 113 and the two fifth walls 114.

[0096] In some embodiments, an insulating structure, such as insulating rubber, is provided between the cover body 11b and the housing 11a. In some embodiments, an insulating structure, such as insulating rubber, is provided between the third wall 112 and the housing 11a.

[0097] In the above solution, by setting the outer shell 11 to include the housing 11a, the cover body 11b, and the third wall 112 that are mutually split structures, the assembly of the first electrode terminal 12, the second electrode terminal 13, and the electrode assembly can be facilitated, effectively improving the assembly efficiency of the battery cell 10, thereby enabling the battery cell 10 to have a high manufacturing efficiency, and further enabling the battery 100 to have a high manufacturing efficiency.

[0098] In some other embodiments of the present application, the cover body 11b may include a first part 1100 and a third part 1102, and the housing 11a may include a second part 1101, a second wall 111, a third wall 112, a fourth wall 113, and two fifth walls 114.

[0099] According to some embodiments of the present application, the dimension of the outer shell 11 in the second direction x is greater than the dimension of the outer shell 11 in the first direction z, and the dimension of the outer shell 11 in the first direction z is greater than the dimension of the outer shell 11 in the third direction y, and the first direction z, the second direction x, and the third direction y are perpendicular to each other in pairs.

[0100] In some embodiments, the first direction z may be the height direction of the battery cell 10, the second direction x may be the length direction of the battery cell 10, and the third direction y may be the thickness direction of the battery cell 10.

[0101] In some embodiments, since the battery cell 10 has a long length dimension and a short height dimension, the first electrode terminal 12 and the second electrode terminal 13 are arranged in the height direction and are located on the first part 1100. The distances from the first electrode terminal 12 and the second electrode terminal 13 to the inside of the battery cell 10 are short, reducing the path of the current flow, thereby reducing the impedance of the battery cell 10 during operation, and being able to reduce the heat generation of the battery cell 10 during charging and discharging, which is beneficial to improving the charge and discharge performance of the battery 100.

[0102] In the above solution, by setting the dimension of the outer shell 11 in the third direction y to be smaller than the dimension of the outer shell 11 in the first direction z, and setting the dimension of the outer shell 11 in the first direction z to be smaller than the dimension of the outer shell 11 in the second direction x, the outer shell 11 is generally in a blade shape, which is beneficial to improving the grouping efficiency of the battery cell 10 and is beneficial to improving the volumetric energy density of the battery 100.

[0103] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism 14, and the pressure relief mechanism 14 is disposed on the second wall 111.

[0104] The pressure relief mechanism 14 may refer to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 10 reaches a threshold value.

[0105] The pressure relief mechanism 14 may be in the form of, for example, an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell 10 reaches a threshold value, the pressure relief mechanism 14 performs an action or a weak structure provided in the pressure relief mechanism 14 is damaged, thereby forming an opening or a channel for releasing the internal pressure or temperature. "Actuation" can be understood as the pressure relief mechanism 14 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 10 can be released. The actions generated by the pressure relief mechanism 14 may include, but are not limited to: at least a part of the pressure relief mechanism 14 breaking, shattering, being torn, or opening, etc.

[0106] When the pressure relief mechanism 14 is actuated, the high-temperature and high-pressure gas inside the battery cell 10 will discharge outward from the actuated part. In this way, the battery cell 10 can be pressure-relieved and temperature-relieved under a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0107] In the above solution, the pressure relief mechanism 14 is provided on the second wall 111, which can reduce the occupation of the space where the electrode terminals are located by the pressure relief mechanism 14, reduce the influence of the pressure relief mechanism 14 on the grouping efficiency of the battery cell 10, and can effectively improve the volume energy density of the battery 100.

[0108] According to some embodiments of the present application, a battery 100 is further provided. Please refer to Figure 7 , Figure 7 which is a schematic diagram of a partial structure of the battery 100 in some embodiments of the present application.

[0109] The battery 100 includes a box body 20 and the battery cell 10 provided above. The box body 20 has an assembly cavity inside, and the battery cell 10 is disposed in the assembly cavity.

[0110] In some embodiments, the box body 20 may include a first box body part 21 and a second box body part 22. The first box body part 21 and the second box body part 22 are covered with each other, and the first box body part 21 and the second box body part 22 jointly define an assembly cavity for accommodating the battery cell 10. The second box body part 22 may be a hollow structure with one end open, and the first box body part 21 may be a plate-like structure. The first box body part 21 covers the opening side of the second box body part 22 so that the first box body part 21 and the second box body part 22 jointly define an accommodation space; the first box body part 21 and the second box body part 22 may also both be hollow structures with one side open, and the opening side of the first box body part 21 covers the opening side of the second box body part 22. Of course, the box body 20 formed by the first box body part 21 and the second box body part 22 may be of various shapes, such as a cylinder, a cuboid, etc. The connection relationship between the first box body part 21 and the second box body part 22 includes but is not limited to bonding, riveting, welding, connection by threaded parts, or other connection relationships.

[0111] In some embodiments, the battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 may first form a group of battery cells 10 and then be assembled in the box body 20. Exemplarily, each group of battery cells 10 includes a plurality of battery cells 10 stacked on top of each other in the second direction x, and the battery cells 10 may be electrically connected through a current collecting component 30. The current collecting component 30 may be disposed between two adjacent battery cells 10. One end of the current collecting part may be connected to the first electrode terminal 12 of one of the battery cells 10, and the other end may be connected to the second electrode terminal 13 of another battery cell 10. The connection relationship between the current collecting component 30 and the electrode terminal includes but is not limited to riveting, welding, connection by threaded parts, or other connection relationships. In some embodiments, the current collecting component 30 may include a tab.

[0112] In the above solution, since the battery 100 has the battery cells 10 provided above, on the one hand, because the internal resistance of the battery cell 10 is relatively low, the charge and discharge performance of the battery 100 is high; on the other hand, because other structural components such as the thermal management component 70 and the flexible circuit layout can be effectively arranged outside the first wall 110, the reliability of the battery 100 is high; on the other hand, because the current collecting component 30 can conveniently connect two adjacent battery cells 10, the manufacturing efficiency of the battery 100 is high.

[0113] According to some embodiments of the present application, please refer to Figure 8 , Figure 8 which is a schematic structural diagram of the battery cell 10 and the current collecting component 30 in some embodiments of the present application.

[0114] The battery 100 further includes a current collecting component 30. Two adjacent battery cells 10 are electrically connected through the current collecting component 30. Along the direction from the inside of the first wall 110 to the outside of the first wall 110, the current collecting component 30 does not protrude beyond the second part 1101.

[0115] The bus bar component 30 can be a structural member that electrically connects two battery cells 10. In some embodiments, one end of the bus bar component 30 can be connected to the electrode terminal of one battery cell 10, and the other end of the bus bar component 30 can be connected to the electrode terminal of another battery cell 10.

[0116] Exemplarily, the bus bar component 30 is in a sheet shape, the two battery cells 10 are stacked along the third direction y, the adjacent fifth walls 114 of the two battery cells 10 are close to and fit with each other, one end of the bus bar component 30 along the third direction y is connected to the first electrode terminal 12 of one of the battery cells 10, the other end of the bus bar component 30 along the third direction y is connected to the first electrode terminal 12 of the other battery cell 10, or one end of the bus bar component 30 along the third direction y is connected to the second electrode terminal 13 of one of the battery cells 10, and the other end of the bus bar component 30 along the third direction y is connected to the second electrode terminal 13 of the other battery cell 10.

[0117] Exemplarily, the bus bar component 30 is in a sheet shape, the two battery cells 10 are stacked along the second direction x, the second walls 111 of the two battery cells 10 face each other, one end of the bus bar component 30 along the second direction x is connected to the first electrode terminal 12 of one of the battery cells 10, the other end of the bus bar component 30 along the third direction y is connected to the second electrode terminal 13 of the other battery cell 10, or one end of the bus bar component 30 along the third direction y is connected to the second electrode terminal 13 of one of the battery cells 10, and the other end of the bus bar component 30 along the third direction y is connected to the first electrode terminal 12 of the other battery cell 10.

[0118] In some embodiments, the material of the bus bar component 30 includes but is not limited to aluminum, aluminum alloy, copper, copper alloy, stainless steel or other conductive materials.

[0119] In some embodiments, the connection relationship between the bus bar component 30 and the electrode terminal includes but is not limited to welding, riveting, connection with threaded parts or other connection relationships.

[0120] Please refer to Figure 8 , in the direction from the inner side of the first wall 110 to the outer side of the first wall 110, the outer side of the bus bar component 30 facing away from the first part 1100 does not extend beyond the outer side of the second part 1101. In some embodiments, in the direction from the inner side of the first wall 110 to the outer side of the first wall 110, the outer side of the bus bar component 30 facing away from the first part 1100 is flush with the outer side of the second part 1101.

[0121] In the above solution, the busbar component 30 is arranged not to exceed the second part 1101, which can effectively reduce the influence of the external structural member on the busbar component 30, reduce the risk of the busbar component 30 falling off, and is beneficial to improving the reliability of the battery 100.

[0122] According to some embodiments of the present application, please refer to Figure 7 and Figure 9 , Figure 9 which is a three-dimensional exploded view of the partial structure of the battery 100 in some embodiments of the present application.

[0123] The battery 100 further includes a connecting beam 40. The connecting beam 40 is disposed in the assembly cavity and divides the assembly cavity into a first cavity 23 and a second cavity 24 arranged along the second direction x. The first cavity 23 is provided with a first battery cell group 50, and the second cavity 24 is provided with a second battery cell group 60. The first battery cell group 50 and the second battery cell group 60 are respectively connected to the connecting beam 40. The first battery cell group 50 includes a plurality of battery cells 10 stacked on each other along the third direction y, and the second battery cell group 60 includes a plurality of battery cells 10 stacked on each other along the third direction y. The first direction z, the second direction x, and the third direction y are perpendicular to each other in pairs.

[0124] The connecting beam 40 is a structural member connected to the box body 20. The connecting beam 40 can improve the structural strength of the box body 20 and can be connected to the first battery cell group 50 and the second battery cell group 60. The connecting beam 40 can be in a plate shape. The length direction of the connecting beam 40 is parallel to the third direction y. The two opposite ends of the connecting beam 40 along the third direction y are respectively connected to the two opposite wall portions of the box body 20 along the third direction y. Along the second direction x, the connecting beam 40 divides the interior of the box body 20 into a first cavity 23 and a second cavity 24. The connection relationship between the connecting beam 40 and the box body 20 includes, but is not limited to, bonding, welding, riveting, clamping, connection by threaded parts, or other connection relationships.

[0125] The first battery cell group 50 includes a plurality of battery cells 10. The plurality of battery cells 10 are stacked on each other along the third direction y. Adjacent two battery cells 10 can be electrically connected through a busbar component 30. In some embodiments, the first battery cell group 50 further includes end plates and side plates. Along the third direction y, the two end plates are respectively disposed at both ends of the stacked plurality of battery cells 10, and the two end plates are connected and fixed by the side plates to clamp and fix the stacked plurality of battery cells 10.

[0126] The second battery cell group 60 includes a plurality of battery cells 10, and the plurality of battery cells 10 are stacked one on another along the third direction y, and two adjacent battery cells 10 can be electrically connected through the busbar component 30. In some embodiments, the second battery cell group 60 further includes an end plate and a side plate, and along the third direction y, the two end plates are respectively disposed at both ends of the plurality of stacked battery cells 10, and the two end plates are connected and fixed by the side plates to clamp and fix the plurality of stacked battery cells 10.

[0127] The first battery cell group 50 and the second battery cell group 60 are respectively connected to the connecting beam 40. In some embodiments, the end plate and / or the side plate may be connected to the connecting beam 40. The connection relationship between the end plate and / or the side plate and the connecting beam 40 includes but is not limited to bonding, clamping, screw connection or other connection relationships.

[0128] In the above scheme, by respectively arranging the first battery cell group 50 and the second battery cell group in the first chamber 23 and the second chamber 24 and respectively connecting them to the connecting beam 40, on the one hand, the structure of the battery 100 can be stable and the overall structural strength is high, which is conducive to improving the reliability of the battery 100; on the other hand, the energy density and capacity of the battery 100 can be effectively improved to meet the power demand.

[0129] According to some embodiments of this application, see Figure 9 Along the second direction x, the third wall 112 of each battery cell 10 is disposed away from the connecting beam 40 .

[0130] In some embodiments, in the first battery cell group 50, a plurality of battery cells 10 are stacked one on another along the second direction x, and the third wall 112 of each battery cell 10 is disposed away from the connecting beam 40, and the second wall 111 of each battery cell 10 is disposed toward the connecting beam 40. A groove formed by the first portion 1100 and the second portion 1101 of each battery cell 10 is interconnected and disposed close to the connecting beam 40. In the first battery cell group 50, the busbars 30 connecting two adjacent battery cells 10 are all located in the groove.

[0131] In the second battery cell group 60, a plurality of battery cells 10 are stacked one on another along the second direction x, and the third wall 112 of each battery cell 10 is respectively disposed away from the connecting beam 40, and the second wall 111 of each battery cell 10 is disposed toward the connecting beam 40, and the groove formed by the first portion 1100 and the second portion 1101 of each battery cell 10 is interconnected and disposed close to the connecting beam 40. In the first battery cell group 50, the confluence components 30 connecting two adjacent battery cells 10 are all located in the groove.

[0132] In some embodiments, the connecting beam 40 is formed with a through hole through which the busbar component 30 can pass so that the busbar component 30 can electrically connect the first battery cell group 50 and the second battery cell group 60.

[0133] In other embodiments, the dimension of the connecting beam 40 in the first direction z is smaller than the dimension of the first battery cell group 50 in the first direction z and also smaller than the dimension of the second battery cell group 60 in the first direction z. The busbar component 30 can span across the connecting beam 40 to electrically connect the first battery cell group 50 and the second battery cell group 60.

[0134] In the above solution, by arranging the third wall 112 of each battery cell 10 away from the connecting beam 40, the arrangement postures of each battery cell 10 can be made consistent, which is beneficial for the busbar component 30 to electrically connect two adjacent battery cells 10, reduces the arrangement difficulty of the busbar component 30, and is beneficial for improving the manufacturing efficiency of the battery 100.

[0135] According to some embodiments of the present application, please refer to Figure 10 and Figure 11 , Figure 10 which are schematic diagrams of the battery cell 10, the connecting beam 40 and the first busbar component 31 in some embodiments of the present application, Figure 11 and

[0136] The battery 100 further includes a first busbar component 31. The connecting beam 40 is formed with a first through hole 41 penetrating along the second direction x. The first through hole 41 is for the first busbar component 31 to pass through so that the first busbar component 31 electrically connects the first battery cell group 50 and the second battery cell group 60.

[0137] In some embodiments, the connecting beam 40 has a first through hole 41 that penetrates the connecting beam 40 along the second direction x. Optionally, along the direction from the inner side to the outer side of the first wall 110, the first through hole 41 is located above the first part 1100 of the battery cell 10. The first busbar component 31 is in a plate shape and penetrates through the first through hole 41 along the second direction x. One end of the first busbar component 31 is connected to the electrode terminal of a battery cell 10 in the first battery cell group 50, and the other end of the first busbar component 31 is connected to the electrode terminal of a battery cell 10 in the second battery cell group 60.

[0138] Exemplarily, the connecting beam 40 is provided with two first through holes 41 for two first busbar components 31 to pass through respectively.

[0139] In the above solution, by providing a first through hole 41 on the connecting beam 40 for the first current collecting component 31 to pass through, the first battery cell group 50 and the second battery cell group 60 can be effectively electrically connected, which is conducive to improving the manufacturing efficiency of the battery 100.

[0140] According to some embodiments of the present application, please refer to Figure 11 , an air flow channel is formed inside the connecting beam 40. Along the second direction x, two opposite surfaces of the connecting beam 40 are respectively formed with a first opening 42 and a second opening 43. The first opening 42 communicates the air flow channel with the first chamber 23, and the second opening 43 communicates the air flow channel with the second chamber 24.

[0141] The air flow channel is a chamber structure formed inside the connecting beam 40. In some embodiments, the connecting beam 40 can be formed by splicing a plurality of plate-like structures to form an air flow channel inside it.

[0142] The first opening 42 is formed on the side of the connecting beam 40 facing away from the second chamber 24 for the gas in the first chamber 23 to enter the air flow channel. The second opening 43 is formed on the side of the connecting beam 40 facing away from the first chamber 23 for the gas in the second chamber 24 to enter the air flow channel.

[0143] In some embodiments, the connecting beam 40 can also be provided with a third opening 44. The third opening 44 can connect the outside with the air flow channel to discharge the gas in the air flow channel out of the box body 20. Optionally, the third opening 44 is formed at the end of the connecting beam 40, and the box body 20 can form an exhaust port corresponding to the third opening 44. The third opening 44 discharges the gas to the outside through the exhaust port. The connection part between the end of the connecting beam 40 and the box body 20 can be sealed to reduce the gas discharged from the third opening 44 from entering the box body 20 again.

[0144] Exemplarily, the gas discharged by the pressure relief mechanism 14 due to the charge and discharge of the battery cell 10 can enter the air flow channel through the first opening 42 or the second opening 43, and finally be discharged to the outside through the third opening 44 to avoid excessive air pressure inside the first chamber 23 or the first chamber 23, which affects the battery cell 10 inside it.

[0145] In some other embodiments, the connecting beam 40 is not provided with a third opening 44. Due to the pressure difference, the gas can enter the air flow channel through the first opening 42 or the second opening 43 and remain in the air flow channel.

[0146] In the above solution, by providing an air flow channel inside the connecting beam 40 and respectively providing a first opening 42 and a second opening 43 on both sides of the connecting beam 40, the gas inside the box body 20 can be collected, so that the air pressure inside the box body 20 is balanced, which is conducive to improving the reliability of the battery 100.

[0147] For other embodiments of the present application, please refer to Figure 12 , Figure 12 FIG. Figure 12 is a schematic diagram of a partial structure of the battery 100 in other embodiments of the present application. The battery 100 further includes a thermal management component 70. Along the first direction z, the thermal management component 70 is disposed on the same side as the second part 1101 and is used for heat exchange with the battery cells.

[0148] In some embodiments, the thermal management component 70 is disposed in the assembly cavity and contacts the second part 1101 of the battery cell 10 for regulating the temperature of the battery cell 10.

[0149] The thermal management component 70 is a component for regulating the temperature of the battery cell 10. A medium can be accommodated inside the thermal management component 70 to regulate the temperature of the battery cell 10, so that the battery 100 is within a suitable temperature range, ensuring the transfer activity of metal ions between the positive and negative electrodes, and enabling the battery 100 to have better charge and discharge performance. The medium here can be a liquid, such as water, or a mixed liquid of water and ethylene glycol, etc., which can regulate the temperature. Regulating the temperature means heating or cooling the battery cell 10.

[0150] Optionally, the medium can be circulated to achieve a better temperature regulation effect.

[0151] Optionally, the medium is unidirectional, that is, the medium flows into the thermal management component 70 through the inlet of the thermal management component 70, exchanges heat with the battery cell 10 inside, and is discharged from the outlet of the thermal management component 70, and the discharged medium does not enter the thermal management component 70 again.

[0152] The thermal management component 70 can be a water-cooled plate, and a plurality of flow channels are provided inside the water-cooled plate for the medium to flow. In some other embodiments, the thermal management component 70 can be other components that can accommodate the medium and exchange heat with the battery cell 10. In some embodiments, the material of the thermal management component 70 can be a metal material such as aluminum, aluminum alloy, or stainless steel.

[0153] Please refer to Figure 12 , in some embodiments, the first chamber 23 and the second chamber 24 can be respectively provided with the thermal management component 70, that is, the first battery cell group 50 and the second battery cell group 60 are respectively provided with the thermal management component 70. Taking the first battery cell group 50 as an example, the thermal management component 70 is a water-cooled plate, and the entire water-cooled plate can contact the second part 1101 of each battery cell 10 in the first battery cell group 50 to regulate the temperature of each battery cell 10.

[0154] The connection relationship between the thermal management component 70 and the second part 1101 includes, but is not limited to, adhesion, direct contact, or other connection relationships. Exemplarily, a thermal conductive adhesive can be provided between the thermal management component 70 and the second part 1101, which on the one hand connects the thermal management component 70 to the battery cell 10, and on the other hand facilitates heat conduction and improves the efficiency of thermal management.

[0155] In the above solution, by arranging the thermal management component 70 to be in contact with the second part 1101, the temperature of the battery cell 10 can be effectively adjusted, the risk of thermal runaway of the battery cell 10 can be reduced, and the reliability of the battery 100 can be improved.

[0156] Some embodiments of the present application further provide an electrical device, which includes the battery cell 10 and / or the battery 100 described above.

[0157] Please refer to Figure 1 , the electrical device can be a vehicle 1000, which has a battery 100 and / or a battery cell 10. The battery 100 and / or the battery cell 10 can be used as the operating power source of the vehicle 1000 for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0158] According to some embodiments of the present application, please refer to Figures 1 - 11 , a battery 100 is provided.

[0159] The battery 100 includes a box body 20, a first battery cell group 50, and a second battery cell group 60.

[0160] The box body 20 includes a first box body part 21 and a second box body part 22. The first box body part 21 and the second box body part 22 are connected to each other and jointly enclose an assembly cavity. A connecting beam 40 is arranged in the second box body part 22, and the connecting beam 40 divides the assembly cavity into a first cavity 23 and a second cavity 24 arranged along the second direction x.

[0161] The first battery cell 10 is arranged in the first cavity 23, and the second battery cell 10 is arranged in the second cavity 24. The first battery cell 10 and the second battery cell 10 each include a plurality of battery cells 10, and the plurality of battery cells 10 are stacked along the third direction y.

[0162] The battery cell 10 can be a blade battery cell. The battery cell 10 includes a housing 11, a first electrode terminal 12, and a second electrode terminal 13. The first direction z is the height direction of the battery cell 10, the second direction x is the length direction of the battery cell 10, and the third direction y is the thickness direction of the battery cell 10.

[0163] The housing 11 has a first wall 110 in the first direction z, and the housing 11 has a second wall 111 and a third wall 112 opposite to each other in the second direction x. The first wall 110 includes a first portion 1100 and a second portion 1101 arranged along the second direction x. The second wall 111 is connected to the first portion 1100, and the third wall 112 is connected to the second portion 1101. Along the direction from the inner side of the first wall 110 to the outer side of the first wall 110, the second portion 1101 protrudes from the first portion 1100, so that a groove is formed at the intersection of the first wall 110 and the second wall 111. The first electrode terminal 12 and the second electrode terminal 13 are respectively located in the groove and are arranged on the first portion 1100. The second wall 111 is provided with a pressure relief mechanism 14 for relieving the pressure inside the battery cell 10.

[0164] In the battery 100, along the second direction x, the third wall 112 of each battery cell 10 faces away from the connection beam 40, and the second wall 111 of each battery cell 10 faces the connection beam 40.

[0165] The connection beam 40 has a first through hole 41 through which the first busbar component 31 passes, and the first battery cell group 50 and the second battery cell group 60 are electrically connected through the first busbar component 31.

[0166] The interior of the connection beam 40 has an air flow channel. Along the second direction x, two opposite surfaces of the connection beam 40 are respectively formed with a first opening 42 and a second opening 43. The first opening 42 communicates the air flow channel with the first chamber 23, and the gas in the first chamber 23 can enter the air flow channel through the first opening 42; the second opening 43 communicates the air flow channel with the second chamber 24, and the gas in the second chamber 24 can enter the air flow channel through the second opening 43.

[0167] In the above solution, by disposing both the first electrode terminal 12 and the second electrode terminal 13 of the battery cell 10 in the groove, on the one hand, it can make the current flow path inside the battery cell 10 shorter, reduce the internal resistance of the battery cell 10, thereby improving the charge and discharge performance of the battery cell 10, and further facilitating the improvement of the charge and discharge performance of the battery 100. On the other hand, it can protect the first electrode terminal 12 and the second electrode terminal 13 and reduce the impact of external shocks on the electrode terminals, thereby facilitating the improvement of the reliability of the battery cell 10 and further facilitating the improvement of the reliability of the battery 100. On the other hand, compared with other positions of the groove on the first wall 110, forming a groove at the junction of the first wall 110 and the second wall 111 makes the first wall 110 have a larger flat area, so that other structural components can be effectively arranged outside the first wall 110. At the battery 100 level, it is conducive to the improvement of structural stability and further conducive to the improvement of the reliability of the battery 100. On the other hand, at the battery 100 level, the bus bar component 30 can easily electrically connect two battery cells 10 arranged along the second direction x, reduce the difficulty of grouping the battery cells 10, and facilitate the improvement of the manufacturing efficiency of the battery 100.

[0168] The foregoing is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing, wherein the housing has a first wall in a first direction, and the housing has a second wall and a third wall opposite to each other in a second direction, wherein the first direction and the second direction are perpendicular to each other; a first electrode terminal; a second electrode terminal having a polarity opposite to that of the first electrode terminal; Among them, the first wall includes a first part and a second part arranged along the second direction, the second wall is connected to the first part, the third wall is connected to the second part, and the second part protrudes from the first part along the direction pointing from the inner side of the first wall to the outer side of the first wall, and the first electrode terminal and the second electrode terminal are respectively arranged on the first part.

2. The battery cell according to claim 1, characterized in that: Along the second direction, the size of the first wall is L1, and the size of the first portion is L2, satisfying that L2 / L1 is less than or equal to 1 / 3.

3. The battery cell according to claim 1, characterized in that: Along a direction from the inner side of the first wall to the outer side of the first wall, the first electrode terminal does not exceed the second portion, and the second electrode terminal does not exceed the second portion.

4. The battery cell according to claim 1, characterized in that: The housing comprises a shell, a cover and the third wall, the shell comprises the second part, a fourth wall and two fifth walls, the second part and the fourth wall are arranged opposite to each other along the first direction, the two fifth walls are arranged opposite to each other along the third direction, the first direction, the second direction and the third direction are perpendicular to each other, along the second direction, one end of the shell is formed with a first opening, and the other end of the shell is formed with a second opening; The cover body closes the first opening. The cover body includes the second wall, the first part, and a third part. The third part connects the first part and the second part. The third wall closes the second opening.

5. The battery cell according to claim 1, characterized in that: The size of the shell in the second direction is greater than the size of the shell in the first direction, the size of the shell in the first direction is greater than the size of the shell in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery cell according to claim 1, characterized in that: The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is disposed on the second wall.

7. A battery, characterized in that: include: A box body having an assembly cavity therein; The battery cell according to any one of claims 1 to 6, wherein the battery cell is arranged in the assembly cavity.

8. The battery according to claim 7, characterized in that The battery further comprises a busbar component, two connected battery cells are electrically connected via the busbar component, and the busbar component points from the inner side of the first wall to the outer side of the first wall, and the busbar component does not exceed the second portion.

9. The battery according to claim 7, characterized in that Also includes: a connecting beam, the connecting beam being disposed in the assembly cavity and dividing the assembly cavity into a first cavity and a second cavity arranged along the second direction; The first chamber is provided with a first battery cell group, and the second chamber is provided with a second battery cell group, the first battery cell group and the second battery cell group are respectively connected to the connecting beam, the first battery cell group includes a plurality of battery cells stacked along a third direction, the second battery cell group includes a plurality of battery cells stacked along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. The battery according to claim 9, characterized in that Along the second direction, the third wall of each of the battery cells is disposed away from the connecting beam.

11. The battery according to claim 10, characterized in that Also includes: A first busbar is formed with a first through hole penetrating along the second direction on the connection beam, and the first through hole is used for the first busbar to pass through, so that the first busbar electrically connects the first battery cell group and the second battery cell group.

12. The battery according to claim 11, characterized in that An air flow channel is formed inside the connecting beam, and along the second direction, two surfaces of the connecting beam facing each other are respectively formed with a first opening and a second opening, the first opening connects the air flow channel and the first chamber, and the second opening connects the air flow channel and the second chamber.

13. The battery according to claim 7, characterized in that Also includes: A heat management component is disposed in the assembly cavity. Along the first direction, the heat management component is disposed on the same side as the second portion and is used for heat exchange with the battery cell.

14. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 6, and / or the battery according to any one of claims 7 to 13.

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