CN217182265U - Battery and electric equipment - Google Patents

Abstract

A battery and a power consumption device are provided. The battery includes: a plurality of battery cells arranged in a first direction; the heat management part extends along a first direction and is connected with a first wall of each battery cell in the plurality of battery cells, the first wall is the wall with the largest surface area in the battery cells, the heat management part comprises a flow channel, the flow channel is used for containing fluid to adjust the temperature of the battery cells, and the second direction is perpendicular to the first wall; wherein, the size of runner is W in the second direction, and the capacity Q of battery monomer satisfies with the size W of runner: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm. According to the technical scheme of the embodiment of the application, the energy density of the battery is improved, and meanwhile the thermal management of the battery is guaranteed, so that the performance of the battery is improved.

Description

Battery and electric equipment

Technical Field

The present application relates to the field of charging, and more particularly, to a battery and a powered device.

Background

With the increasing environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor regarding its development.

The energy density of the battery is an important parameter in the performance of the battery, however, other performance parameters of the battery need to be considered when improving the energy density of the battery. Therefore, how to improve the performance of the battery is an urgent technical problem to be solved in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and consumer, can guarantee the thermal management of battery when promoting the energy density of battery to promote the performance of battery.

In a first aspect, a battery is provided, comprising: a plurality of battery cells arranged in a first direction; a thermal management member extending in the first direction and connected to a first wall of each of the plurality of battery cells, the first wall having a largest surface area in the battery cell, the thermal management member including a flow channel for receiving a fluid to regulate a temperature of the battery cell, the second direction being perpendicular to the first wall; wherein, the size of the flow channel in the second direction is W, and the capacity Q of the single battery and the size W of the flow channel satisfy: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm.

In the embodiment of the application, the heat management part is arranged in the battery and connected with the first wall with the largest surface area of each battery cell in a row of the plurality of battery cells arranged along the first direction, and the size W of the flow channel of the heat management part and the capacity Q of the battery cells in the second direction meet 1.0Ah/mm & lt Q/W & lt 400 Ah/mm. Therefore, the middle part of the box body of the battery does not need to be provided with structures such as a beam and the like, and the space utilization rate in the battery can be improved to a large extent, so that the energy density of the battery is improved; meanwhile, the thermal management component can also ensure thermal management in the battery. Therefore, the technical scheme of the embodiment of the application can guarantee the thermal management in the battery while improving the energy density of the battery, so that the performance of the battery can be improved.

In one possible implementation manner, a dimension D of the battery cell in the second direction and a dimension H of the thermal management component in the third direction satisfy: D/H is more than or equal to 0.03 and less than or equal to 5.5, and the third direction is perpendicular to the first direction and the second direction. Therefore, the size of the heat management component can be flexibly set for the battery cells with different sizes, the requirement on energy density is met, and heat diffusion among the battery cells can be well prevented.

In one possible implementation, the dimension H of the thermal management component in the third direction is 15mm to 300 mm. Therefore, space, strength and thermal management can be taken into consideration, and the performance of the battery is guaranteed.

In one possible implementation, the dimension W of the flow channel is 0.8mm to 50 mm. Therefore, space, strength and thermal management can be taken into consideration, and the performance of the battery is guaranteed.

In one possible implementation, the thermal management component includes a first thermally conductive plate and a second thermally conductive plate disposed opposite each other along the second direction; and a flow channel is arranged between the first heat-conducting plate and the second heat-conducting plate and used for containing and adjusting the fluid of the temperature of the battery monomer.

In a possible implementation manner, the heat management component further comprises a reinforcing rib, the reinforcing rib is arranged between the first heat conduction plate and the second heat conduction plate, and the reinforcing rib, the first heat conduction plate and the second heat conduction plate form the flow channel. In this way, the structural strength of the thermal management component may be enhanced.

In a possible implementation manner, an included angle between the reinforcing rib and the first heat-conducting plate or the second heat-conducting plate is an acute angle. In this way, the thermal management member may have a larger compression space in the second direction, thereby providing more expansion space for the battery cell.

In one possible implementation manner, the battery cell includes two first walls oppositely arranged in a second direction and two second walls oppositely arranged in the first direction, wherein in the first direction, the second walls of two adjacent battery cells are opposite. Therefore, the first wall with a large area is connected with the thermal management component, so that the heat exchange of the single battery is facilitated, and the performance of the battery is guaranteed.

In one possible implementation manner, the battery includes a plurality of rows of the plurality of battery cells arranged along the first direction and a plurality of the thermal management components, where the plurality of rows of the battery cells and the plurality of the thermal management components are alternately arranged in the second direction. Like this, multiseriate battery monomer and a plurality of thermal management parts interconnect form a whole, hold in the box, can enough carry out effectual thermal management to each battery monomer, can guarantee the holistic structural strength of battery again to can promote the performance of battery.

In one possible implementation, the thermal management component is bonded to the first wall. In this way, the strength of the connection between the thermal management component and the first wall is increased.

In a second aspect, there is provided an electric device, including the battery in the first aspect or any possible implementation manner of the first aspect, where the battery is configured to provide electric energy.

In a third aspect, a method for preparing a battery is provided, comprising: providing a plurality of battery cells arranged in a first direction; providing a thermal management member extending in the first direction and connected to a first wall of each of the plurality of battery cells, the first wall having a largest surface area in the battery cell, the thermal management member including a flow channel for receiving a fluid to regulate a temperature of the battery cell, the second direction being perpendicular to the first wall; wherein, the size of the flow channel in the second direction is W, and the capacity Q of the single battery and the size W of the flow channel satisfy: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm.

In a fourth aspect, there is provided an apparatus for preparing a battery, comprising means for performing the method of the third aspect described above.

According to the technical scheme of the embodiment of the application, the heat management part is arranged in the battery and connected with the first wall with the largest surface area of each battery monomer in the battery monomers arranged in the first direction, and the size W of the flow channel of the heat management part and the capacity Q of the battery monomers in the second direction meet the condition that Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm. Therefore, the middle part of the box body of the battery does not need to be provided with structures such as a beam and the like, and the space utilization rate in the battery can be improved to a large extent, so that the energy density of the battery is improved; meanwhile, the thermal management component can also ensure thermal management in the battery. Therefore, the technical scheme of the embodiment of the application can guarantee the thermal management in the battery while improving the energy density of the battery, so that the performance of the battery can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.

FIG. 1 is a schematic illustration of a vehicle according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a battery according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a battery cell according to an embodiment of the present application;

FIG. 4A is a schematic diagram of a battery according to an embodiment of the present application;

FIG. 4B is an enlarged schematic view of the thermal management component of FIG. 4A;

FIG. 5 is a schematic diagram of a battery according to an embodiment of the present application;

FIG. 6 is a schematic view of a battery cell coupled to a thermal management component according to an embodiment of the present application;

FIG. 7 is a cross-sectional view taken along A-A of FIG. 6;

FIG. 8 is an enlarged schematic view of region B of FIG. 7;

FIG. 9 is a schematic diagram of a battery according to an embodiment of the present application;

fig. 10 is a schematic view of a method of making a battery according to an embodiment of the present application;

fig. 11 is a schematic view of an apparatus for manufacturing a battery according to an embodiment of the present application.

In the drawings, the drawings are not necessarily to scale.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terminology used is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures, are intended to cover non-exclusive inclusions; "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed and removable connections as well as integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

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, or the like, which is not limited in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells are generally divided into three types in an encapsulation manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are not limited in the embodiment of the application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery pack or the like. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the isolation film can be polypropylene (PP), Polyethylene (PE) or the like. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

In order to meet different power requirements, a battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Alternatively, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted. The battery is further arranged in the electric equipment to provide electric energy for the electric equipment.

The development of battery technology should take into consideration various design factors such as energy density, cycle life, discharge capacity, charge and discharge rate, safety, etc. Under the condition that the internal space of the battery is fixed, the utilization rate of the internal space of the battery is improved, and the method is an effective means for improving the energy density of the battery. However, other parameters of the battery, such as thermal management of the battery, etc., are also considered while improving the utilization of the internal space of the battery.

In the free use of battery, can produce a large amount of heats, when the heat can not in time distribute away, these heats constantly accumulate, and the stack can take place thermal runaway, the incident such as smoking, fire, explosion appear. Meanwhile, long-term severe temperature non-uniformity may greatly reduce the service life of the battery. In addition, when the temperature is low, the discharge efficiency of the battery is low, and even the battery is difficult to start at low temperature, which affects the normal use of the battery. Therefore, how to guarantee the battery is critical to the need for thermal management.

In view of this, the present invention provides a solution, in which a thermal management component is disposed in a battery, and is connected to a first wall having a largest surface area of each of a plurality of battery cells arranged in a row along a first direction, wherein the thermal management component includes a flow channel, and in a second direction, a size W of the flow channel satisfies a capacity Q of the battery cell: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm. Like this, the box middle part of battery can not need to set up roof beam isotructure again, can promote the inside space utilization of battery by great limit to promote the energy density of battery. Meanwhile, the heat management component can prevent heat diffusion among the battery cells. Therefore, the technical scheme of the embodiment of the application can guarantee the thermal management in the battery while improving the energy density of the battery, so that the performance of the battery can be improved.

The technical scheme described in the embodiment of the application is applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships, spacecrafts and the like, and the spacecrafts comprise airplanes, rockets, space shuttles, spacecrafts and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described devices, but may be applied to all devices using batteries, and for simplicity of description, the following embodiments are all described by taking an electric vehicle as an example.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 1 according to an embodiment of the present disclosure, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being configured to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, for example, the battery 10 may be used as an operation power supply of the vehicle 1 for a circuit system of the vehicle 1, for example, for power demand for operation at the start, navigation, and running of the vehicle 1. In another embodiment of the present application, the battery 10 may be used not only as an operation power source of the vehicle 1 but also as a driving power source of the vehicle 1, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1.

In order to meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, as shown in fig. 2, the battery 10 may include a plurality of battery cells 20 for a structural schematic diagram of the battery 10 according to an embodiment of the present disclosure. The battery 10 may further include a case 11, the inside of the case 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series or in a combination of series and parallel to each other and then placed in the case 11.

Optionally, the battery 10 may also include other structures, which are not described in detail herein. For example, the battery 10 may further include a bus member for electrically connecting the plurality of battery cells 20, such as in parallel or in series-parallel. Specifically, the bus member may achieve electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus bar member may be fixed to the electrode terminals of the battery cells 20 by welding. The electric energy of the plurality of battery cells 20 can be further led out through the box body by the conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of the battery cells 20 may be set to any number according to various power requirements. A plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve greater capacity or power. Since the number of the battery cells 20 included in each battery 10 may be large, the battery cells 20 may be arranged in groups for convenience of installation, each group of the battery cells 20 constituting a battery module. The number of the battery cells 20 included in the battery module is not limited and may be set as required. The battery may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.

As shown in fig. 3, which is a schematic structural diagram of a battery cell 20 according to an embodiment of the present disclosure, the battery cell 20 includes one or more electrode assemblies 22, a case 211, and a cover plate 212. The housing 211 and cover 212 form a housing or battery compartment 21. The walls of the housing 211 and the cover plate 212 are referred to as the walls of the battery cell 20, wherein for the cuboid battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The case 211 is determined according to the shape of one or more electrode assemblies 22 after being combined, for example, the case 211 may be a hollow rectangular parallelepiped or a square or a cylinder, and one of the faces of the case 211 has an opening so that one or more electrode assemblies 22 can be placed in the case 211. For example, when the housing 211 is a hollow rectangular parallelepiped or square, one of the planes of the housing 211 is an open plane, i.e., the plane has no wall body so that the housing 211 communicates inside and outside. When the housing 211 may be a hollow cylinder, the end surface of the housing 211 is an open surface, i.e., the end surface has no wall body so that the housing 211 is communicated with the inside and the outside. The cap plate 212 covers the opening and is connected with the case 211 to form a closed cavity in which the electrode assembly 22 is placed. The case 211 is filled with an electrolyte, such as an electrolytic solution.

The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 may be disposed on the cap plate 212. The cap plate 212 is generally in the shape of a flat plate, and two electrode terminals 214 are fixed to the flat plate surface of the cap plate 212, the two electrode terminals 214 being a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. One connecting member 23, which may also be referred to as a current collecting member 23, is disposed at each of the electrode terminals 214, between the cap plate 212 and the electrode assembly 22, for electrically connecting the electrode assembly 22 and the electrode terminals 214.

As shown in fig. 3, each electrode assembly 22 has a first tab 221a and a second tab 222 a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected with one electrode terminal by one connecting member 23, and the second tab 222a of one or more electrode assemblies 22 is connected with the other electrode terminal by the other connecting member 23. For example, the positive electrode terminal 214a is connected to a positive electrode tab through one connecting member 23, and the negative electrode terminal 214b is connected to a negative electrode tab through the other connecting member 23.

In the battery cell 20, the electrode assembly 22 may be provided singly or in plurality according to actual use requirements, and as shown in fig. 3, 4 independent electrode assemblies 22 are provided in the battery cell 20.

The battery cell 20 may also be provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is actuated to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

The pressure relief mechanism 213 may be any of various possible pressure relief structures, which are not limited in the embodiments of the present application. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and/or, pressure relief mechanism 213 may be a pressure sensitive pressure relief mechanism configured to rupture when the internal air pressure of battery cell 20 in which pressure relief mechanism 213 is disposed reaches a threshold value.

Fig. 4A is a schematic structural diagram of a battery according to an embodiment of the present application, and fig. 4B is an enlarged schematic diagram of the thermal management component in fig. 4A. As shown in fig. 4A and 4B, the battery 10 includes a plurality of battery cells 20 arranged in a first direction and a thermal management member 101. The thermal management member 101 extends in a first direction and is connected to a first wall 20a of each of the plurality of battery cells 20, and the first wall 20a is a wall having a largest surface area in the battery cell 20. The thermal management member 101 includes a flow channel 104 for receiving a fluid to regulate the temperature of the battery cell 20, and the second direction is perpendicular to the first wall 20 a. The size of the flow channel 104 in the second direction is W, and the capacity Q of the battery cell and the size W of the flow channel satisfy the following conditions: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm.

The flow passage 104 may be formed by a pair of heat conductive plates in the heat management part 101, and the dimension W of the flow passage in the second direction may be a distance between inner walls of the heat conductive plates in the second direction. The larger the dimension W of the flow channel 104, the larger the volume of fluid that can flow in the flow channel 104, and thus the faster the heat transfer between the battery cell 20 and the thermal management member 101. For example, when the thermal management component 101 is a water-cooled plate, the larger the size W of the flow channel 104, the faster the heat dissipation of the battery cell 20, and thus the cooling of the battery cell 20, the more quickly the heat dissipation of the battery cell 20 can be prevented from spreading to the adjacent battery cell 20. Alternatively, the fluid may be circulated for better temperature regulation. Alternatively, the fluid may be water, a mixture of water and ethanol, refrigerant, air, or the like.

Fig. 5 is a schematic structural view of a battery according to an embodiment of the present application, and as shown in fig. 5, the thermal management member 101 and the plurality of battery cells 20 each extend in a first direction, i.e., an x direction, and the thermal management member 101 is connected to a first wall 20a of each battery cell 20, i.e., the first wall 20a faces the thermal management member 101. In this way, the heat of the battery cell 20 may be transferred to the thermal management member 101 and carried away via the fluid in the flow channel 104, enabling control of the temperature of the battery cell 20, e.g., enabling cooling of the battery cell 20.

Optionally, the length of the thermal management component 101 in the first direction is equal to the sum of the lengths of all the battery cells 20 in the same column, so that the battery cells 20 can be sufficiently cooled while reducing the space occupied by the thermal management component 101. In other embodiments, the length of the thermal management component 101 may be less than or equal to the sum of the lengths of all the battery cells 20, and may be specifically set according to actual requirements, which is not limited in the embodiments of the present application.

The size W of the flow channel 104 of the heat management component 101 and the capacity Q of the battery cell 20 meet the condition that Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm. Through the rapid cooling of the battery cell 20 with the excessively high temperature, the heat of the battery cell 20 can be prevented from being diffused and transferred to the adjacent battery cell 20, thereby causing the excessively high temperature of the adjacent battery cell 20.

When Q/W is larger than 400Ah/mm, the size W of the flow channel 104 is small, the volume of the fluid which can flow through the flow channel 104 is small, and the battery cell 20 cannot be cooled in time. In this way, when the temperature of a certain battery cell 20 is too high, since the battery cell 20 is not cooled in time, the heat of the battery cell 20 is diffused to the adjacent battery cell 20, so that the temperature of the adjacent battery cell 20 is too high, and an abnormality occurs, which affects the performance of the entire battery 10.

When Q/W is less than 1.0Ah/mm, the dimension W of the flow channel 104 is large, and the volume of the fluid that can flow through the flow channel 104 is large, so that the battery cell 20 can be sufficiently cooled. However, the large size of the flow channel 104 results in a large space occupied by the thermal management member 101, and the energy density of the battery 10 cannot be ensured, and the excessively large volume of the thermal management member 101 also results in an increase in cost.

In the embodiment of the present application, the thermal management member 101 is connected to the first wall 20a having the largest surface area of each of the plurality of battery cells 20 in the same column arranged in the first direction, and the size W of the flow channel 104 and the capacity Q of the battery cell 20 satisfy: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm. The middle part of the box body of the battery can be free from structures such as beams, the space utilization rate inside the battery can be improved to a large extent, and therefore the energy density of the battery is improved. Meanwhile, the thermal management component can also ensure thermal management in the battery. Therefore, the technical scheme of the embodiment of the application can guarantee the thermal management in the battery while improving the energy density of the battery, so that the performance of the battery can be improved.

Fig. 6 is a schematic structural diagram illustrating connection between a battery cell and a thermal management component according to an embodiment of the present application. Fig. 7 is a sectional view taken along a-a in fig. 6, and fig. 8 is an enlarged view of a region B in fig. 7. Optionally, in an embodiment of the present application, with reference to fig. 6 to 8, a dimension D of the battery cell 20 in the second direction and a dimension H of the thermal management component 101 in the third direction satisfy: D/H is more than or equal to 0.03 and less than or equal to 5.5, and the third direction is perpendicular to the first direction and the second direction.

The dimension D of the battery cell 20 in the second direction may be a thickness D of the battery cell 20, the thickness D of the battery cell 20 being related to a capacity Q of the battery cell 20, the larger the thickness D, the larger the capacity Q.

The dimension H of the thermal management component 101 in the third direction may be a height H of the thermal management component 101 in the z-direction, where the larger H, the larger the volume of the thermal management component 101, the larger the occupied space, and the stronger the thermal management capability. For example, when the thermal management member 101 is a water-cooled plate, the larger H is, the higher the cooling capacity of the battery cell 20 is, and the more effectively the heat of the battery cell 20 is prevented from being diffused to the adjacent battery cell 20.

When D/H < 0.03, the dimension H of the heat management member 101 in the third direction is large, and the requirement of preventing the heat diffusion of the battery cell 20 can be sufficiently satisfied, but it is difficult to satisfy the energy density requirement of the battery 10, and the large volume of the heat management member 101 also causes an increase in production cost.

When D/H > 5.5, the thermal management component 101 is difficult to satisfy the thermal management requirement for the battery cell 20, that is, the heat of the battery cell 20 cannot be conducted out in time, so that the heat is diffused to the adjacent battery cell 20, which causes temperature abnormality of other battery cells 20, and further affects the performance of the battery 10.

Optionally, in an embodiment of the present application, the dimension H of the thermal management component 101 in the third direction is 15mm to 300 mm. In this way, the thermal management component 101 may compromise strength with thermal management performance requirements.

Optionally, in an embodiment of the present application, the dimension W of the flow channel 104 is 0.8mm to 50 mm. In this way, the requirements of strength and thermal management performance can be considered.

Optionally, in an embodiment of the present application, the thermal management component 101 includes a first thermally conductive plate 1011 and a second thermally conductive plate 1012 disposed opposite in a second direction; a flow channel 104 is disposed between the first heat conduction plate 1011 and the second heat conduction plate 1012, and the flow channel 104 is used for accommodating a fluid for adjusting the temperature of the battery cell 20.

The first heat-conductive plate 1011 and the second heat-conductive plate 1012 extend in the first direction and are disposed oppositely in the second direction. Thus, in the second direction, the cavity between the first heat conduction plate 1011 and the second heat conduction plate 1012 forms the flow passage 104.

Optionally, in an embodiment of the present application, the thermal management component 101 further includes a reinforcing rib 1013, the reinforcing rib 1013 is disposed between the first heat-conducting plate 1011 and the second heat-conducting plate 1012, and the reinforcing rib 1013, the first heat-conducting plate 1011 and the second heat-conducting plate 1012 form the flow channel 104. In this way, the structural strength of the thermal management component 101 may be enhanced.

Alternatively, the number of the ribs 1013 is one, so that one or two flow passages 104 may be formed between the first heat conduction plate 1011 and the second heat conduction plate 1012. When the reinforcing rib 1013 is connected to the first heat conducting plate 1011 or the second heat conducting plate 1012 only, the reinforcing rib 1013 is a cantilever with one end connected to the heat conducting plate, and at this time, only one flow channel 104 is formed; when the reinforcement 1013 is connected to the first heat conduction plate 1011 and the second heat conduction plate 1012, two flow channels 104 are formed. The number of the ribs 1013 may be specifically set according to the requirement, and the embodiment of the present application does not limit this.

Optionally, when the number of the flow passages 104 is multiple, different flow passages 104 may be independent from each other, or may be communicated through an adapter.

Optionally, the stiffener 1013 extends along the first direction, and the angle between the stiffener and the first heat conducting plate 1011 or the second heat conducting plate 1012 is a right angle. In this case, the thermal management component 101 may withstand greater pressures.

Optionally, in an embodiment of the present application, an included angle between the reinforcement rib 1013 and the first heat conduction plate 1011 or the second heat conduction plate 1012 is an acute angle. In this way, the thermal management component 101 may have a larger compression space in the second direction, which may provide more expansion space for the battery cell 20.

Alternatively, in an embodiment of the present application, the battery cell 20 includes two first walls 20a disposed opposite to each other in the second direction and two second walls 20b disposed opposite to each other in the first direction, wherein the second walls 20b of two adjacent battery cells 20 are opposite to each other in the first direction. For example, the battery cell 20 includes a first wall 20a, a second wall 20b, and third walls, the first wall 20a, the second wall 20b, and the third walls being adjacent to each other, wherein the surface area of the first wall 20a is larger than the surface area of the second wall 20b, one of the third walls is disposed away from the bottom of the case as a top surface of the battery cell, and the other is disposed toward the bottom of the case as a bottom surface of the battery cell.

Fig. 9 is a schematic structural diagram of a battery according to an embodiment of the present application. Alternatively, in an embodiment of the present application, as shown in fig. 9, the battery 10 includes a plurality of rows of the plurality of battery cells 20 arranged in the first direction and a plurality of heat management parts 101, wherein the plurality of rows of the battery cells 20 and the plurality of heat management parts 101 are alternately arranged in the second direction.

The battery 10 includes a case 11, a plurality of rows of battery cells 20, and a plurality of heat management members 101, a duct 103, and a current collector 102. The current collector 102 and the pipe 103 are disposed at both ends of the thermal management member 101 in the first direction, and the fluid is transferred to the current collector 102 via the pipe 103, and then collected by the current collector 102 and transferred to the thermal management member 101, thereby cooling the battery cell 20.

The plurality of rows of battery cells 20 and the plurality of heat management parts 101 are alternately arranged in the second direction, wherein the battery cells may be arranged in a battery cell-heat management part-battery cell manner or in a heat management part-battery cell-heat management part manner along the second direction. In the former arrangement, the number of rows of the battery cells 20 is N, the number of the thermal management members 101 is N-1, and the energy density of the battery 10 is higher. In the latter arrangement, the number of rows of the battery cells 20 is N, and the number of the thermal management members 101 is N +1, so that the thermal management performance of the battery 10 is better and the cooling speed of the battery cells 20 is faster. The two arrangement modes can cool the battery cells 20 in time on the premise of ensuring the energy density of the battery 10, and effectively prevent the heat of the battery cells 20 from diffusing to the adjacent battery cells 20.

Alternatively, in the battery 10, the thermal management member may be arranged in a manner of battery cell-thermal management member, as long as cooling or heating of the first wall 20a of the battery cell 20 can be achieved, which is not limited by the embodiment of the present application.

Optionally, in an embodiment of the present application, the thermal management component 101 is bonded to the first wall 20 a. In this way, the fixing strength between the thermal management member 101 and the first wall 20a is increased.

Alternatively, the thermal management member 101 may also be sandwiched between the battery cells 20 of the adjacent rows or the side walls of the case 11 and the battery cells 20 by abutting against the first wall 20 a.

It should be understood that relevant portions in the embodiments of the present application may be mutually referred, and are not described again for brevity.

An embodiment of the present application also provides a powered device, which may include the battery 10 in the foregoing embodiments. Optionally, the electric device may be a vehicle 1, a ship, a spacecraft, or the like, but the embodiment of the present application is not limited thereto.

The battery 10 and the electric device according to the embodiment of the present application are described above, and the method and the device for manufacturing the battery according to the embodiment of the present application will be described below, wherein the parts not described in detail can be referred to the foregoing embodiments.

Fig. 10 shows a schematic flow diagram of a method 300 of preparing a battery according to an embodiment of the present application. As shown in fig. 10, the method 300 may include:

310 providing a plurality of battery cells 20 arranged in a first direction;

a heat management member 101, wherein the heat management member 101 extends along a first direction and is connected with the first wall 20a of each battery unit 20 in the plurality of battery units 20, the first wall 20a is a wall with the largest surface area in the battery unit 20, the heat management member comprises a flow channel 104, the flow channel 104 is used for containing fluid to regulate the temperature of the battery unit 20, and the second direction is perpendicular to the first wall; wherein, the size of the flow channel 104 in the second direction is W, and the capacity Q of the battery cell 20 and the size W of the flow channel 104 satisfy: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm.

Fig. 11 shows a schematic block diagram of an apparatus 400 for preparing a battery according to an embodiment of the present application. As shown in fig. 11, the apparatus 400 for preparing a battery may include: a first providing module 410 and a second providing module 420.

The first providing module 410 is used for providing a plurality of battery cells 20 arranged in a first direction.

The second providing module 420 is configured to provide a thermal management member 101, the thermal management member 101 extends along a first direction and is connected to a first wall 20a of each battery cell 20 in the plurality of battery cells 20, the first wall 20a is a wall with a largest surface area in the battery cell 20, the thermal management member includes a flow channel 104, the flow channel 104 is configured to contain a fluid to regulate the temperature of the battery cell 20, and the second direction is perpendicular to the first wall; wherein, the size of the flow channel 104 in the second direction is W, and the capacity Q of the battery cell 20 and the size W of the flow channel 104 satisfy: Q/W is more than or equal to 1.0Ah/mm and less than or equal to 400 Ah/mm.

Hereinafter, examples of the present application will be described. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the present disclosure.

The battery 10 was subjected to a thermal diffusion test according to GB38031-2020 using a combination of two columns of battery cells 20 and two thermal management components 101, the test results being shown in table 1.

Table 1 thermal diffusion testing of different specifications of cells and thermal management components

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (11)

1. A battery (10), comprising:

a plurality of battery cells (20) arranged in a first direction;

a thermal management member (101), the thermal management member (101) extending along the first direction and being connected to a first wall (20a) of each battery cell (20) of the plurality of battery cells (20), the first wall (20a) being a wall having a largest surface area in the battery cell (20), the thermal management member (101) comprising a flow channel (104), the flow channel (104) being used for containing a fluid to regulate the temperature of the battery cell (20);

wherein the size of the flow channel (104) in the second direction is W, and the capacity Q of the battery cell (20) and the size W of the flow channel (104) satisfy: 1.0Ah/mm < Q/W < 400Ah/mm, said second direction being perpendicular to said first wall (20 a).

2. The battery (10) according to claim 1, wherein a dimension D of the battery cell (20) in the second direction and a dimension H of the thermal management member (101) in a third direction satisfy: D/H is more than or equal to 0.03 and less than or equal to 5.5, and the third direction is perpendicular to the first direction and the second direction.

3. The battery (10) according to claim 2, wherein a dimension H of the thermal management member (101) in the third direction is 15mm to 300 mm.

4. The battery (10) of claim 1, wherein the flow channel (104) has a dimension W of 0.8mm to 50 mm.

5. The battery (10) of claim 1, wherein the thermal management component (101) comprises a first thermally conductive plate (1011) and a second thermally conductive plate (1012) disposed opposite in the second direction;

a flow channel (104) is arranged between the first heat conduction plate (1011) and the second heat conduction plate (1012), and the flow channel (104) is used for containing a fluid for adjusting the temperature of the battery cell (20).

6. The battery (10) of claim 5, wherein the thermal management member (101) further comprises a stiffener (1013), the stiffener (1013) being disposed between the first heat-conducting plate (1011) and the second heat-conducting plate (1012), the stiffener (1013), the first heat-conducting plate (1011), and the second heat-conducting plate (1012) forming the flow channel (104).

7. The battery (10) of claim 6, wherein the angle of the stiffener (1013) with the first heat-conducting plate (1011) or the second heat-conducting plate (1012) is acute.

8. The battery (10) according to claim 1, wherein the battery cell (20) comprises two first walls (20a) oppositely disposed in the second direction and two second walls (20b) oppositely disposed in the first direction, wherein the second walls (20b) of two adjacent battery cells (20) are opposite in the first direction.

9. The battery (10) according to claim 1, wherein the battery includes a plurality of rows of the plurality of battery cells (20) arranged in the first direction and a plurality of the thermal management members (101), wherein the plurality of rows of the battery cells (20) and the plurality of the thermal management members (101) are alternately arranged in the second direction.

10. The battery (10) according to any one of claims 1 to 9, wherein the thermal management member (101) is bonded to the first wall (20 a).

11. An electrical device, comprising: the battery (10) according to any one of claims 1 to 10, the battery (10) being for providing electrical energy.

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