WO2023092363A1

WO2023092363A1 - Battery case, battery, electric device, and method for manufacturing battery case

Info

Publication number: WO2023092363A1
Application number: PCT/CN2021/132928
Authority: WO
Inventors: 黄智杰; 王庆; 可庆朋
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2023-06-01

Abstract

Provided in the embodiments of the present application are a battery case, a battery, an electric device, and a method for manufacturing a battery case. The battery case comprises a case body, which is open at the top and is provided with a flow channel at the bottom for the circulation of coolant; a cover plate, which covers the bottom of the case body to close the flow channel; and a connecting portion, which is fixedly connected to the bottom of the case body and the cover plate. According to the technical solution of the embodiments of the present application, the heat generated during battery operation can be removed by flowing the coolant through the flow channel so as to alleviate the heat generating condition of the battery. In addition, the case body and the cover plate provide protection for the battery, which not only ensures that the battery is not subject to bumps, but also isolates the battery from the external environment to enable the battery to maintain a good operating temperature even in low-temperature conditions.

Description

Battery box, battery, electrical device and battery box manufacturing method

technical field

The present application relates to the field of batteries, in particular to a battery box, a battery, an electrical device and a method for manufacturing the battery box.

Background technique

Nowadays, the new energy industry has received widespread attention, and batteries, as the core of the new energy industry, have received more attention. In the prior art, on the one hand, heat will inevitably be generated during the working process of the battery, which will affect the life and performance of the battery. When driving in winter, the battery is prone to a reduction in cruising range.

Contents of the invention

Embodiments of the present application provide a battery case, a battery, an electrical device, and a method for manufacturing the battery case, which can alleviate the heat generation of the battery and can also ensure the operating temperature of the battery in a low-temperature environment.

In a first aspect, a battery case is provided, comprising: a case main body with an opening at the top, and a flow channel for circulating cooling liquid at the bottom; a cover plate covering the bottom of the case main body to closing the flow channel; and a connecting part, which fixedly connects the bottom of the box main body and the cover plate.

In the battery case of the embodiment of the present application, since the bottom of the main body of the case is provided with a flow channel for circulating the cooling liquid and a cover plate for closing the flow channel, when the battery is placed in the battery case, The heat generated by the battery can be taken away by making the cooling liquid flow in the flow channel, so as to alleviate the heating of the battery. Isolate the battery from the external environment, so that it has a good working temperature even in a low temperature environment.

In some embodiments, the connection part includes adhesive, which bonds the area of the bottom of the box body other than the flow channel and the cover plate. By using the adhesive, the cover plate and the bottom of the box main body can be connected together more easily and reliably, and the movement and falling off of the cover plate can be avoided.

In some embodiments, the shape of the connection part corresponds to the shape of the flow channel. As a result, the flow channels can be more reliably closed, making the multiple flow channels more distinct, and avoiding gaps between the cover plate and the bottom of the box main body.

In some embodiments, the battery box further includes a positioning structure, which determines the relative position of the cover plate and the box body, so that the cover plate can be connected to a predetermined position of the box body . By arranging the positioning structure, the cover plate can be reliably connected to the predetermined position of the box body, avoiding misalignment and gaps between the cover plate and the bottom of the box body, and ensuring the sealing performance of the flow channel.

In some embodiments, the positioning structure includes a positioning column provided at the bottom of the box body, and a positioning hole provided on the cover plate into which the positioning column can be inserted. Through the cooperation of the positioning post and the positioning hole, multiple positions of the cover plate are positioned, can be reliably connected to predetermined positions of the box body and can prevent the cover plate from moving after being positioned.

In some embodiments, a plurality of bosses are arranged at intervals on the bottom of the box body. In this way, the connection part can be arranged on the boss to increase the area of the connection part, and the connection part can be distributed in multiple positions to more reliably fix the box body and the cover plate.

In some embodiments, the flow path includes a variable speed flow path that varies the flow rate of the coolant. When the flow rate of the cooling liquid changes, it can increase the chance of turbulent flow, thus, more heat can be taken away and the cooling efficiency can be improved.

In some embodiments, the variable speed channel includes a variable speed region, and the cooling liquid forms a confluence and/or a split flow in the variable speed region, so as to increase the probability of turbulent flow of the cooling liquid. The flow rate of the coolant can be easily changed by converging and/or dividing the coolant in the speed change region.

In some embodiments, the speed change area is located in the middle of the speed change channel in the length direction. Since the battery generates more heat in the central area, arranging the shifting area in the middle of the lengthwise direction of the shifting channel can achieve a better cooling effect.

In some embodiments, the flow channel wall of the flow channel has a chamfer structure at a position where the direction changes. Such a structural resistance is very small, and the circulation process of the coolant will be smoother.

In some embodiments, the cross-section of the channel in the depth direction is U-shaped. The water channel with a U-shaped cross section has the advantages of easy processing, small resistance and good cooling effect.

In some embodiments, the thickness of the bottom of the box body is 5-30 mm, and the depth of the flow channel is 3-10 mm.

In some embodiments, the box body is integrally formed with the flow channel. As a result, the flow channel is directly formed at the bottom of the box main body, and the process of setting the flow channel at the bottom of the box body can be omitted.

In some embodiments, the box body is made of plastic and/or the cover is made of metal. The plastic material has good thermal insulation performance, and it also ensures that the cold environment outside the battery box hardly affects the work of the battery module. The cover plate is made of metal material, which has better heat transfer performance and can improve cooling efficiency.

In a second aspect, the present application provides a battery, including the battery case of the first aspect.

In a third aspect, the present application provides an electric device, including: the battery in the second aspect.

In a fourth aspect, a method for manufacturing a battery box is provided, comprising: providing a box main body, one side of which is open, and a flow channel for cooling liquid circulation is provided at the bottom; providing a cover plate covering the box The bottom of the main body is used to close the flow channel; a connection part is provided, which is fixedly connected to the box body and the cover plate.

In some embodiments, the box body is manufactured by injection molding, heat pressing or molding.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the application. Also, the same reference numerals are used to denote the same components throughout the drawings. In the attached picture:

FIG. 1 is a schematic structural view of a vehicle in some embodiments of the present application;

FIG. 2 is a schematic structural view of batteries in some embodiments of the present application;

Fig. 3 is a schematic structural diagram of a battery box in some embodiments of the present application;

Fig. 4 is a top view of the battery case of some embodiments of the present application;

Fig. 5 is a schematic structural diagram of a box body in some embodiments of the present application;

Figure 6 is an enlarged view at B of Figure 5;

Figure 7 is an enlarged view at C of Figure 5;

Fig. 8 is a sectional view along the arrow direction at A-A place of Fig. 4;

FIG. 9 is a flow chart of a method for manufacturing a battery case according to some embodiments of the present application.

The reference numerals in the specific embodiment are as follows:

vehicle 800, motor 400, controller 300, battery 500, battery module 100, battery cell 101,

Box body 600, box body upper body 601, box body body 602, cover plate 603, connection part 604, flow channel 605, positioning part 606, positioning column 606a, positioning hole 606b, boss 607, liquid inlet 608, liquid outlet mouth 609,

The variable speed channel 10, the first channel 11, the second channel 12, the third channel 13, the fourth channel 14, the fifth channel 15, the speed change areas D1, D2.

Detailed ways

Embodiments of the technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples, rather than limiting the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application 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 present application. The occurrences of this 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 understood explicitly and implicitly by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist alone. There are three cases of B. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

"Multiple" appearing in this application refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two groups), and "multi-piece" refers to more than two (Includes two pieces).

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. The battery cells are generally divided into three types according to the way of packaging: cylindrical battery cells, cube square battery cells and pouch battery cells, which is not limited in the embodiment of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, and the like. Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell works primarily by moving metal ions between the positive and negative plates. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector coated with the positive electrode active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current is passed without fusing, the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together. The material of the isolation film can be PP or PE. In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.

The battery will generate heat during the working process, which will affect the life and performance of the battery. On the other hand, when the battery works in a cold environment, it is prone to poor battery life.

In view of this, the present application provides a battery case, comprising: a case main body with an opening at the top and a flow channel for circulating cooling liquid at the bottom; a cover plate covering the bottom of the case main body to closing the flow channel; and a connecting part, which fixedly connects the bottom of the box main body and the cover plate. Since the bottom of the box main body is provided with a flow channel for the circulating flow of the cooling liquid and a cover plate for closing the flow channel, when the battery is placed in the battery box, it is possible to bring the cooling liquid through the flow channel. Take away the heat generated by the battery to alleviate the heating of the battery. On the other hand, the main body and cover of the box protect the battery. It also has a good working temperature.

The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include Airplanes, rockets, space shuttles and spaceships, etc.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applicable to the devices described above, but may also be applicable to all devices using batteries. However, for the sake of brevity, the following embodiments are described by taking an electric vehicle as an example.

Next, specific examples of the present application will be described in detail.

FIG. 1 is a schematic structural diagram of a vehicle 800 according to an embodiment of the present application. The vehicle 800 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. A motor 400 , a controller 300 and a battery 500 may be provided inside the vehicle, and the controller 300 is used to control the battery 500 to supply power to the motor 400 . For example, the battery 500 may be provided at the bottom or front or rear of the vehicle. The battery 500 can be used for power supply of the vehicle. For example, the battery 500 can be used as the operating power source of the vehicle for the circuit system of the vehicle 800 , for example, for the starting, navigation and working power requirements of the vehicle 800 during operation. In another embodiment of the present application, the battery 500 can not only be used as an operating power source for the vehicle 800 , but can also be used as a driving power source for the vehicle 800 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 800 .

In order to meet different power usage requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel or in parallel, and the hybrid connection refers to a mixture of series and parallel connections. Batteries can also be called battery packs. Optionally, a plurality of battery cells can be connected in series, parallel or mixed to form a battery module, and then a plurality of battery modules can be connected in series, parallel or mixed to form a battery. That is to say, multiple battery cells can directly form a battery, or form a battery module first, and then form a battery from the battery module.

FIG. 2 is a schematic structural diagram of a battery 500 according to an embodiment of the present application. The battery 500 may include a plurality of battery cells 101 . The battery 500 may further include a battery case 600 , which is a hollow structure, and a plurality of battery cells 101 are accommodated in the battery case 600 . As shown in FIG. 2 , the battery case 600 may include a case upper body 601 and a case body 602 , and the case upper body 601 and the case body 602 are fastened together. The shapes of the case upper body 601 and the case body 602 can be determined according to the combined shape of multiple battery cells 101 , and both the case upper body 601 and the case body 602 have an opening. For example, the upper casing body 601 and the casing main body 602 can be hollow cuboids and one face is an opening face respectively, the opening of the upper casing body 601 and the opening of the casing main body 602 are arranged oppositely, and the upper casing body 601 and The box bodies 602 are snapped together to form a box with a closed chamber. A plurality of battery cells 101 are connected in parallel or connected in series or combined in parallel and placed in the box formed by fastening the box upper body 601 and the box main body 602 . In addition, the battery case 600 may not include the case upper body 601 .

According to different power requirements, the number of battery cells 101 can be set to any value. Multiple battery cells 101 can be connected in series, in parallel or in parallel to achieve greater capacity or power. Since the number of battery cells 101 included in each battery 500 may be large, for the convenience of installation, the battery cells 101 may be arranged in groups, and each group of battery cells 101 constitutes a battery module 100 . The number of battery cells 101 included in the battery module 100 is not limited, and can be set according to requirements. For example, the battery 500 may include a plurality of battery modules 100, and these battery modules 100 may be connected in series, in parallel or in parallel.

FIG. 3 is a schematic structural diagram of a battery case 600 (excluding the case upper body 601 ) in some embodiments of the present application.

As shown in Figure 3, the battery box 600 includes a box body 602, a cover plate 603, and a connecting portion 604. The top of the box body 602 is open, and the bottom is provided with a flow channel 605 for cooling liquid circulation; the cover plate 603 covers the The bottom of the box body 602 is used to close the flow channel 605 ; the connecting portion 604 is fixedly connected to the bottom of the box body 602 and the cover plate 603 .

In the battery box 600, since the bottom of the box main body 602 is provided with a flow channel 605 for the circulating flow of cooling liquid and a cover plate 603 for closing the flow channel, when the battery module 100 is placed in the box body 602 At this time, only the cover plate 603 and the connection part 604 are separated between the battery module 100 and the cooling liquid, so the heat generated by the battery module 100 can be taken away by making the cooling liquid flow in the flow channel 605, and the battery module 100 can be alleviated. On the other hand, the box body 602 and the cover plate 603 form a double-layer structure to protect the bottom of the battery module 100, which can not only ensure that the battery module 100 is not impacted, but also isolate the battery module 100 from the external environment. The battery module 100 also has a good working temperature in a low temperature environment.

In addition, as shown in FIG. 3 , the cover plate 603 is provided with a liquid inlet 608 and a liquid outlet 609 , and the cooling liquid, for example, flows from the liquid inlet through a pipe (not shown) from the outside of the battery case 600 under the action of a circulating pump. 608 enters the flow channel 605 and leaves the flow channel 605 through the liquid outlet 609 after traveling along the flow channel 605 . When the cooling liquid travels through the channel 605 , it exchanges heat with the battery module 100 placed on the cover plate 603 to help the battery module 100 dissipate heat. In addition, the temperature of the battery module 100 can also be monitored, and the flow rate of the cooling liquid can be controlled according to the temperature of the battery module 100. For example, when the temperature of the battery module 100 is high, the cooling liquid can be controlled to have a faster flow rate and take more heat. The liquid inlet 608 and the liquid outlet 609 can also be arranged at other positions, as long as the cooling liquid can be circulated in and out.

The box main body 602 is preferably made of plastic material, which has better thermal insulation performance, which can ensure that the heat of the battery module 100 is difficult to dissipate to the outside of the battery box 600 during operation, and also ensures that the cold environment outside the battery box 600 will not affect the battery. Module 100 work. Moreover, the density of the plastic is low, and compared with the battery case 600 made of other materials, it has the advantages of light weight and low cost.

The cover plate 603 is preferably made of metal material, which has better heat transfer performance, so that the heat generated by the battery module 100 can be transferred to the cooling liquid under the cover plate 603 faster to improve cooling efficiency.

In some embodiments, as shown in FIG. 3 , the connection part 604 includes adhesive, which bonds the area of the bottom of the box body 602 other than the flow channel 605 and the cover plate 603 .

By using adhesive, the cover plate 603 and the bottom of the box body 602 can be connected together more easily and reliably, and the cover plate 603 can be prevented from moving and falling off. Compared with other connection methods such as bolt connection, the use of adhesive can make the connection area between the cover plate 603 and the bottom of the box body 602 larger and evenly distributed, which can avoid the partial fall of the cover plate 603 and the outflow of coolant due to loose bolts The situation, the operation is also more convenient and faster. Moreover, the adhesive can also fill the gap between the cover plate 603 and the bottom of the box body 602, so that the sealing performance of the flow channel 605 is better. But the present application is not limited thereto, and the above-mentioned bolt connection method can be used to connect the cover plate 603 and the bottom of the box body 602 , or an adhesive can be used in combination with other connection methods.

In addition, the adhesive can also be pre-heated and molded into a solid form corresponding to the shape of the flow channel 605 , and then placed on the bottom of the box body 602 , so that the process of applying the adhesive can be omitted.

In some embodiments, as shown in FIG. 3 , the shape of the connecting portion 604 corresponds to the shape of the flow channel 605 .

The overall shape of the connecting portion 604 is similar to that of the cover plate 603 , and the connecting portion 604 is hollowed out at the position corresponding to the flow channel 605 , and the vacated position on the connecting portion 604 is the position corresponding to the flow channel 605 . Thus, the connecting portion 604 fills all the gaps between the cover plate 603 and the box body 602 except the flow channel 605, which can more reliably close the flow channel 605, make the multiple flow channels 605 more distinct, and make the cooling liquid follow the The established circuit flows to avoid the coolant flow out and the coolant flow disorder.

Fig. 4 is a top view of a battery case 600 (excluding the case upper body 601 ) according to some embodiments of the present application.

In some embodiments, as shown in Figures 3 and 4, the battery case 600 further includes a positioning structure 606, which determines the relative position of the cover 603 and the case body 602, so that the cover 603 can be connected to the case body 602 the intended location.

By setting the positioning structure 606, the cover plate 603 can be reliably connected to the predetermined position of the box body 602, avoiding misalignment and gap between the cover plate 603 and the bottom of the box body 602 during installation, and ensuring the sealing of the flow channel 605 performance.

In some embodiments, as shown in FIG. 3 and FIG. 4 , the positioning structure 605 includes a positioning column 606 a provided at the bottom of the box body 602 , and a positioning hole 606 b provided on the cover plate 603 into which the positioning column 606 a can be inserted.

Through the cooperation of the positioning post 606a and the positioning hole 606b, multiple positions of the cover plate 603 are positioned, and can be reliably connected to the predetermined position of the box body 602, and after the positioning post 606a is inserted into the positioning hole 606b, it can effectively prevent the The cover plate 603 moves. In addition, when the adhesive is used as the connecting portion 604, the adhesive can close the gap between the positioning post 606a and the positioning hole 606b, ensuring the connection and fixing effect on the cover plate 603 while ensuring that the flow channel 605 is reliably sealed. .

In some embodiments, as shown in FIG. 3 , a plurality of bosses 607 are arranged at intervals on the bottom of the box body 602 .

The boss 607 protrudes from the bottom of the box body 602 toward the side of the cover plate 603, so that the connecting portion 604 can be arranged on the boss 607 to increase the area of the connecting portion 604, and the plurality of bosses 607 The arrangement can make the connecting portion 604 distributed in multiple positions, and more reliably fix the box body 602 and the cover plate 603 . In addition, the positioning column 606a can be conveniently arranged on the boss 607 .

FIG. 5 is a schematic structural diagram of a box body 602 in some embodiments of the present application.

As shown in Figure 5, the flow channel 605 is arranged at the bottom of the box body 602, mainly including a transverse flow channel 605a extending along the length direction of the box body 602 (arrow x direction in Figure 5) and a transverse flow channel 605a extending along the width direction of the box body 602 (Figure 5). 5 in the direction of arrow y) extending the longitudinal channel 605b. The horizontal flow channel 605a is arranged close to the two long side walls of the box body 602, and the vertical flow channel 605b is arranged between the horizontal flow channels 605a and perpendicular to the horizontal flow channel 605a. Such a configuration can set the flow channels 605 densely, so that the coolant flows through a larger area, thereby taking away more heat.

FIG. 6 is an enlarged view of area B in FIG. 5 .

In some embodiments, as shown in FIG. 6 , the flow channel 605 includes a variable speed flow channel 10 that changes the flow rate of the coolant. When the flow velocity of the coolant changes, it can increase the chance of turbulent flow. In the depth direction of the channel (perpendicular to the xy plane in Figure 5), the upper part of the coolant that absorbs more heat will move downward during turbulent flow. , while the coolant in the middle or bottom that absorbs less heat will turn over to the upper side to contact the cover plate 603 during turbulent flow, thereby taking away more heat and improving heat exchange efficiency.

In some embodiments, as shown in FIG. 6 , the speed change channel 10 includes speed change areas D1 and D2 , where the cooling liquid forms confluence and/or split flow to increase the probability of turbulent flow of the cooling liquid. The flow rate of the coolant can be easily changed by converging and/or dividing the coolant in the speed change regions D1 and D2. More specifically, for example, as shown in FIG. 6 , the variable speed passage 10 includes a first passage 11 , a second passage 12 , a third passage 13 , a fourth passage 14 and a fifth passage 15 . The first road 11 and the second road 12 are connected to one end of the fifth road 15 , and the third road 13 and the fourth road 14 are connected to the other end of the fifth road 15 . As shown by the arrows in Figure 6, when the coolant enters the fifth track 15 from the first track 11 and the second track 12, confluence occurs and the flow speed increases. When the coolant enters the third track 13 and the fourth track 14 from the fifth track 15, The diversion occurs, and the flow velocity slows down. D1 and D2 at both ends of the fifth channel 15 are the above-mentioned variable speed areas. In addition, the speed change channel 10 may also only include the speed change area D1 where the cooling liquid forms a confluence, or only includes the speed change area D2 where the cooling liquid forms a split flow.

In some embodiments, as shown in FIG. 6 , the speed change regions D1 and D2 are located in the middle of the speed change channel 10 in the length direction (y direction in FIG. 5 ). Since the battery cells generate more heat in the central area, disposing the shifting areas D1 and D2 in the middle of the lengthwise direction of the shifting channel 10 can achieve a better cooling effect. In addition, since the lateral flow channel is close to the edge of the main body 602 of the battery case, the speed-changing flow channel 10 may not be provided on the lateral flow channel, and only the variable-speed flow channel 10 is provided on the longitudinal flow channel. Of course, the variable speed flow channel 10 can also be arranged on the transverse flow channel.

In addition, the speed change channel 10 is not limited to the above-mentioned structure, as long as it can change the flow velocity of the coolant when it flows. For example, setting protrusions and/or depressions on the bottom of the flow channel or on the wall of the flow channel can also change the flow speed of the cooling liquid when it flows through, increasing the chance of turbulent flow.

FIG. 7 is an enlarged view of area C in FIG. 5 .

In some embodiments, as shown in FIG. 7 , the flow channel wall of the flow channel 605 has a chamfer structure 16 at the position where the direction changes, that is, the position where the cooling liquid changes the flow direction when it flows. Such a structural resistance is very small, and the circulation process of the coolant will be smoother.

Fig. 8 is a sectional view along the direction of the arrow at A-A of Fig. 4 .

In some embodiments, as shown in FIG. 8 , the cross section of the flow channel 605 in the depth direction (the up-down direction in FIG. 8 , and the direction perpendicular to the xy plane in FIG. 5 ) is U-shaped. The water channel with a U-shaped cross section has the advantages of easy processing, small resistance and good cooling effect.

In some embodiments, the thickness of the bottom of the box body 602 is 5-30 mm, and the depth of the flow channel is 3-10 mm. The battery modules 100 meeting different specifications can be used. The thickness of the bottom of the box main body 602 is more preferably 10-15mm, such a thickness has a good heat preservation effect, and will not affect the energy density of the battery because of being too thick.

In some embodiments, the box body 602 and the flow channel 605 are integrally formed. Thus, the flow channel 605 is directly formed at the bottom of the box body 602 , and the process of disposing the flow channel 605 at the bottom of the box body 602 can be omitted.

The battery case 600 according to the embodiment of the present application has been described above.

The present application also provides a battery 500, including the battery case 600 of the above-mentioned embodiment.

The present application also provides an electric device, including: the above-mentioned battery 500 . It is used to provide electrical energy. Optionally, the electrical device may be the vehicle 800 shown in FIG. 1 , or may be a ship or a spacecraft.

The present application also provides a method for manufacturing the battery case.

FIG. 9 shows a flowchart of a manufacturing method of a battery case 600 according to an embodiment of the present application.

As shown in Figure 9, the manufacturing method of the present embodiment includes:

Step S1, providing a box main body 602, one side of which is open, and the bottom of which is provided with a flow channel 605 for circulating cooling liquid;

Step S2, providing a cover plate 603 covering the bottom of the box body 605 to close the flow channel 605;

Step S3 , providing a connecting portion 604 , which fixedly connects the bottom of the box main body 602 and the cover plate 603 .

More specifically, for example, the box main body 602 is first manufactured through the mold of the box main body 602, and the manufactured box body 602 includes the above-mentioned runner 605. In addition, the manufactured box body 602 also includes a positioning column 606a and boss 607 . The box body 602 is manufactured by, for example, injection molding, hot pressing or molding. Next, put a metal plate into a stamping die to form a cover plate 603 , and punch out a positioning hole 606 b corresponding to the positioning post 606 a in the cover plate 603 . Finally, apply the adhesive as the connection part 604 on the bottom of the box body 602 except for the water channel 605, and align the positioning hole 606b of the cover plate 603 with the positioning column 606a on the box body 602, and the adhesive The cover plate 603 is connected and fixed with the box main body 602 to complete the battery box 600 .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. All of them should be covered by the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A battery case, comprising:

The main body of the box is open at the top, and the bottom is provided with a flow channel for the circulating flow of cooling liquid;

a cover plate covering the bottom of the box body to close the flow channel; and

The connection part is fixedly connected with the bottom of the box main body and the cover plate.
The battery case according to claim 1, wherein,

The connecting portion includes an adhesive, which bonds the area of the bottom of the box main body other than the flow channel and the cover plate.
The battery case according to any one of claims 1-2, wherein the shape of the connecting portion corresponds to the shape of the flow channel.
The battery case according to any one of claims 1-3, wherein,

It also includes a positioning structure, which determines the relative position of the cover plate and the box body, so that the cover plate can be connected to a predetermined position of the box body.
The battery case according to claim 4, wherein,

The positioning structure includes a positioning column provided at the bottom of the box body, and a positioning hole provided on the cover plate into which the positioning column can be inserted.
The battery case according to any one of claims 1-5, wherein,

The bottom of the box main body is provided with a plurality of bosses at intervals.
The battery case according to any one of claims 1-6, wherein,

The flow path includes a variable speed flow path that changes the flow velocity of the coolant.
The battery case according to claim 7, wherein,

The variable speed channel includes a variable speed area, and the cooling liquid forms confluence and/or split flow in the variable speed area, so as to increase the probability of turbulent flow of the cooling liquid.
The battery case according to claim 8, wherein,

The speed change area is located in the middle of the speed change channel in the length direction.
The battery case according to any one of claims 1-9, wherein,

The flow channel wall of the flow channel has a chamfered structure at the position where the direction changes.
The battery case according to any one of claims 1-10, wherein,

The section in the depth direction of the flow channel is U-shaped.
The battery case according to any one of claims 1-11, wherein,

The thickness of the bottom of the box main body is 5-30mm, and the depth of the flow channel is 3-10mm.
The battery case according to any one of claims 1-12, wherein,

The box main body is integrally formed with the flow channel.
The battery case according to any one of claims 1-13, wherein,

The box body is made of plastic and/or the cover is made of metal.
A battery, comprising the battery case according to any one of claims 1-14.
An electric device, comprising: the battery according to claim 15, the battery is used to provide electric energy.
A method for manufacturing a battery case, comprising:

Provide the main body of the box, one side of which is open, and the bottom of which is provided with a flow channel for the circulation of cooling liquid;

providing a cover plate covering the bottom of the box body to close the flow channel;

A connection portion is provided, which is fixedly connected to the bottom of the box main body and the cover plate.
The method for manufacturing a battery case according to claim 17, wherein:

The box main body is manufactured by injection molding, hot pressing or molding.