CN215578803U

CN215578803U - Battery module, battery and power consumption device

Info

Publication number: CN215578803U
Application number: CN202122354679.2U
Authority: CN
Inventors: 李晓伟; 刘晓梅; 吴宁生
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-18
Anticipated expiration: 2031-09-27

Abstract

The application provides a battery module, battery and electric installation relates to battery technical field. The battery module comprises a bottom plate with at least two fixing grooves; the battery cell fixing device comprises at least two battery cells, at least two fixing grooves and a first sealing strip, wherein the at least two battery cells are arranged in one-to-one correspondence with the at least two fixing grooves; the battery cell is provided with a side plate and an end plate, and second sealing strips are arranged between the battery cell and the side plate as well as between the battery cell and the end plate; and the top plate, and fixing glue is filled among the first sealing strip, the second sealing strip and the top plate. The battery module passes through the fixed slot of bottom plate and the fixed electric core of fixed glue to reduce the vibration of electric core in use top welding seam department as far as possible, improve the welding seam of electric core vibration in the use and despin the safety problem and the life-span problem of weeping, still because be provided with first sealing strip, second sealing strip simultaneously, the fixed glue can be filled the local gap between electric core, and then reduces the influence to energy density.

Description

Battery module, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery module, a battery and an electric device.

Background

With the rapid development of the power electric automobile industry, the loading capacity is increased year by year, and the endurance mileage of the electric automobile is an important factor related to the development.

In order to continuously improve the endurance mileage of the electric vehicle and improve the energy density of the battery, the thickness of the aluminum shell of the battery is gradually reduced. However, in the process of assembling and manufacturing the thin aluminum shell, the welding seam of the electric core of the aluminum shell with the thicker electric core phase is too narrow, and the welding strength is low, which may cause the welding part of the thin aluminum shell to be detached due to vibration in the use process of the battery, thereby causing liquid leakage of the electric core, directly influencing the service life of the battery, and even causing potential safety hazard.

In order to solve the above problems, the currently adopted method is as follows: the battery cores are arranged in the battery pack, and then the battery cores are fixed in a mode of injecting liquid glue into gaps among the battery cores. The mode that adopts direct notes liquid to glue can effectively weaken the shake of electricity core in the use, but the fixed glue is great to the energy density influence of battery module, leads to the energy density reduction of battery module.

SUMMERY OF THE UTILITY MODEL

The application provides a battery module, battery and power consumption device can enough improve the battery and lead to the safety problem and the life-span problem of electric core weeping easily because the vibration in the use, can also improve energy density.

In a first aspect, the present application provides a battery module, which includes a bottom plate, at least two cells, a side plate, and an end plate. Wherein, the bottom plate is provided with at least two fixing grooves; the at least two battery cells and the at least two fixing grooves are arranged in a one-to-one correspondence manner, and the bottoms of the battery cells are fixed in the corresponding fixing grooves; a first sealing strip is arranged between every two adjacent electric cores; second sealing strips are arranged between the battery cell and the side plates and between the battery cell and the end plates; and fixing glue is filled among the first sealing strip, the second sealing strip and the top plate.

In the technical scheme of this application embodiment, in the fixed slot of bottom plate is fixed in to the bottom of every electric core, the top of every electric core can be fixed to the fixed glue of packing between first sealing strip, second sealing strip and the roof to reduce the vibration of electric core top welding seam department in the use as far as possible, improve the welding seam desoldering weeping's that electric core vibration in the use leads to safety problem and the life-span problem. Meanwhile, the first sealing strip and the second sealing strip are arranged, so that the fixing glue can be filled in a local gap between the battery cores, and the influence on the energy density is further reduced.

In some embodiments, the shortest distance from the first sealing strip and the second sealing strip between the cell and the end plate to the bottom plate is equal. The heights of the first sealing strip and the second sealing strip on the large-surface side of the battery cell are equal, and the heights of the fixing glue on the two large-surface sides of each battery cell are equal, so that the acting force of the fixing glue on the two large-surface sides of each battery cell is equal.

In some embodiments, the shortest distance from the first bead and the second bead to the bottom plate is equal. All the first sealing strips and the second sealing strips are equal in height, and the fixing glue positioned on each side of each battery cell is equal in height, so that the acting force of the fixing glue on each battery cell is basically equal.

In some embodiments, the second sealing strip is formed in a loop shape, and both ends of each first sealing strip are connected or overlapped to the second sealing strip. The annular second sealing strip can fill gaps among the side plates, the end plates and the battery cell, so that the fixing glue solution is prevented from continuously flowing to the bottom plate from the gaps among the side plates, the end plates and the battery cell; the two ends of each first sealing strip are connected or lapped on the second sealing strip, so that no gap exists between the first sealing strip and the second sealing strip, the fixing glue can be allowed to pass through, and the fixing glue is prevented from continuously flowing to the bottom plate from the gap between any adjacent electric cores. The glue injection amount is controlled, and the energy density of the battery module is further improved.

In some embodiments, the first sealing strip and the second sealing strip are integrally formed. The first sealing strip and the second sealing strip can be of an integrally formed structure, and when the battery cell is installed, the integrally formed structure formed by the first sealing strip and the second sealing strip is directly sleeved on the battery cells. A plurality of electric cores can be further fixed to the integrated into one piece structure that first sealing strip and second sealing strip formed, reduces the vibration of electric core top welding seam department in the use.

In some embodiments, the cell has a height L₁The distance from the bottom of the first sealing strip and/or the second sealing strip to the top of the battery cell is L₂，1/4L₁≤L₂＜L₁. Distance L from the bottom of the first sealing strip to the top of the battery core₂Greater than or equal to 1/4L₁And is less than L₁During the process, the battery cell can be better fixed through the fixing groove and the fixing glue of the bottom plate, and the vibration of the battery cell at the welding line at the top in the using process is reduced. When L is₂The smaller the value of (a), the higher the energy density of the battery module is, and the worse the effect of relieving the vibration of the battery core is; when L is₂The larger the value, the lower the battery module energy density, and the better the effect of relieving the cell vibration. Different battery modules select suitable injecting glue volume according to the service condition, realize the maximize of electric core safety and energy density.

In some embodiments, the distance between two adjacent cells is L₃，0＜L₃Less than or equal to 10 mm. The part region in the gap between two adjacent electric cores is filled to the fixed glue, and when the interval of two adjacent electric cores is being more than 0 and less than or equal to 10mm, can make the fixed glue realize the effect of fixed electric core, also can reduce the use amount of fixed glue as far as possible, improves battery module energy density.

In some embodiments, the first sealing strip has a width L₄，L₃≤L₄≤1mm+L₃. The width of the first sealing strip is more than or equal to L₃And is less than or equal to 1mm + L₃During the process, the width of the first sealing strip can be equal to the distance between two adjacent electric cores, and can also be slightly wider than the distance between two adjacent electric cores, after the electric cores are installed, the two adjacent electric cores extrude the first sealing strip, the first sealing strip deforms, and the width is reduced.

In some embodiments, the cell has a height L₁The thickness of the first sealing strip and/or the second sealing strip is L₅，0＜L₅≤1/2L₁. The thickness of the first sealing strip and/or the second sealing strip is more than 0 and less than or equal to 1/2L₁During the process, the first sealing strip and/or the second sealing strip can prevent the fixing glue solution from continuously flowing, and the energy density of the battery module is not greatly improved.

In some embodiments, the material of the first sealing strip and/or the second sealing strip is soft rubber. The friction force of soft rubber and electric core, curb plate and end plate is great, and when the injecting glue, first sealing strip and/or second sealing strip can not slide at will to the strict control injecting glue volume.

In a second aspect, the present application provides a battery including the battery module.

In a third aspect, the present application provides an electric device, which includes the above battery module, and the battery module is used for providing electric energy.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a simplified schematic illustration of a vehicle according to some embodiments of the present application;

FIG. 2 is a schematic diagram of the battery of the vehicle of FIG. 1;

fig. 3 is an exploded view of a battery module according to some embodiments of the present application;

fig. 4 is a schematic structural diagram of a plurality of aligned cells provided with a first sealing strip and a second sealing strip according to some embodiments of the present application;

fig. 5 is a front view of a plurality of aligned cells provided with a first sealing strip and a second sealing strip in accordance with some embodiments of the present application;

fig. 6 is a left side view of a plurality of aligned cells provided with a first sealing strip and a second sealing strip in accordance with some embodiments of the present application;

FIG. 7 is a schematic view of the construction of a first and second integrally formed sealing strip in some embodiments of the present application;

FIG. 8 is a top view of the integrally formed first and second sealing strips in some embodiments of the present application;

fig. 9 is a left side view of a plurality of aligned cells provided with a first sealing strip and a second sealing strip, labeled L, according to some embodiments of the present application₁And L₂The position of (a);

fig. 10 is a top view of a plurality of aligned cells provided with a first sealing strip and a second sealing strip in some embodiments of the present application;

FIG. 11 is a partial schematic view of FIG. 10, wherein L is the symbol₃The position of (a);

FIG. 12 is a schematic view of the construction of a first and second integrally formed weatherstrip according to some embodiments of the present application, where L is the reference number₄And L₅The position of (a).

Icon: 1000-a vehicle;

100-a battery; 200-a controller; 300-a motor;

10-a box body; 11-a first part; 12-a second part;

20-a battery module; 21-side plate; 22-an end plate; 23-a top plate; 24-electric core; 25-a fixed groove; 26-a first sealing strip; 27-second sealing strip.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein 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.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein 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 application. 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.

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

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the technical terms "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning a fixed connection, a detachable connection, or an integral part; the connection may be mechanical or electrical. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

The inventor of the application finds that the welding seam of the electric core phase thicker aluminum shell of the thin aluminum shell is too narrow, the welding strength is lower, and the welding joint of the thin aluminum shell caused by vibration in the use process of the battery is likely to be detached, so that the service life of the battery is directly influenced by liquid leakage of the electric core, and even potential safety hazards can be caused. In order to solve the above problems, the currently adopted method is as follows: the battery cores are arranged in the battery pack, and then the battery cores are fixed in a mode of injecting liquid glue into gaps among the battery cores. The mode that adopts direct notes liquid to glue can effectively weaken the shake of electricity core in the use, but the fixed glue is great to the energy density influence of battery module, leads to the energy density reduction of battery module.

The inventor of the application finds that the energy density of the battery module is improved while the jitter of the battery cell in the using process is weakened. The technical effect can be achieved by controlling the glue injection amount of the battery module.

Based on above consideration, in order to solve the problem of the safety and the life of the battery cell that easily leads to the leakage of the battery cell due to vibration in the use process of the battery cell, the energy density of the battery module is also improved. The inventor is through deep research, a battery module has been designed, through set up the fixed slot on the bottom plate, make the bottom one-to-one of every electric core be fixed in the fixed slot of bottom plate, and set up first sealing strip between two adjacent electric cores, at electric core and curb plate, set up the second sealing strip between the end plate, make the stationary glue exist in first sealing strip, the region between second sealing strip and the roof, realize the partial injecting glue of electric core, when reducing the vibration of electric core top welding seam department, the injecting glue volume can also be controlled, further improve battery module energy density.

In such battery module, the bottom of electricity core is fixed by the fixed slot, and the top of electricity core is fixed by the fixed glue to make whole electricity core by better fixing in the casing of battery module. When the battery is used, the vibration at the welding seam at the top is weakened, and the safety problem and the service life problem of the welding seam desoldering leakage caused by the vibration are reduced.

Under the background to the increase of battery energy density demand, the battery module of this application can be through setting up first sealing strip and second sealing strip at different heights, thereby the energy density of control battery module is controlled to the injection volume of the fixed glue solution of control. The injection amount of the fixed glue solution in the battery module can be set according to the vibration degree of the target battery under the actual use working condition, and the injection amount of the fixed glue solution is reduced as far as possible on the premise that the welding seam of the battery core is complete.

In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in this application. The battery cell can be a cylinder, a flat body, a cuboid or other shapes, and the like, and the embodiment of the application is not limited to the above. The cells are generally divided into three types according to the packaging mode: cylinder electricity core, square electricity core and soft-packaged electric core.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate and an isolating membrane. The battery core mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece includes anodal mass flow body and anodal active substance layer, and anodal active substance layer coats in anodal mass flow body's surface, and the anodal mass flow body protrusion in the anodal mass flow body that has coated anodal active substance layer of uncoated anodal active substance layer, and the anodal mass flow body that does not coat anodal active substance layer is as anodal utmost point ear. 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 active material layer, and the negative active material layer coats in the surface of negative current collector, and the negative current collector protrusion in the negative current collector who has coated the negative active material layer of uncoated negative active material layer, the negative current collector who does not coat the negative active material layer makes 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 may be polypropylene (PP) or Polyethylene (PE). 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.

The battery cell also comprises a current collecting component, wherein the current collecting component is used for electrically connecting a lug of the battery cell and the electrode terminal so as to transmit electric energy from the electrode component to the electrode terminal and transmit the electric energy to the outside of the battery cell through the electrode terminal; the electric connection among the plurality of battery cores is realized through the confluence part so as to realize the series connection, the parallel connection or the series-parallel connection of the plurality of battery cores.

It can be understood that the battery module described in the embodiment of the present application may directly supply power to the electric devices, or may form a battery in parallel or in series to supply power to various electric devices in the form of a battery.

The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery modules to provide higher voltage and capacity. The battery generally includes a case for enclosing one or more battery modules, and the case can prevent liquid or other foreign matters from affecting the charging or discharging of the battery cells.

The battery also comprises a sampling terminal and a battery management system, wherein the sampling terminal is connected to the bus component and is used for collecting information of the battery core, such as voltage or temperature. The sampling terminal transmits the acquired information of the battery core to the battery management system, and when the battery management system detects that the information of the battery core exceeds a normal range, the output power of the battery is limited so as to realize safety protection.

It is to be understood that the electric device using the battery module or the battery described in the embodiments of the present application may be applied to various forms, for example, a mobile phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, and the like, an electric toy including a stationary type or a mobile type electric toy, for example, a game machine, an electric car toy, an electric ship toy, an electric plane toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.

The battery module and the battery described in the embodiments of the present application are not limited to be applied to the above-described electric devices, but may be applied to all electric devices using the battery module and the battery.

FIG. 1 illustrates a simplified schematic view of a vehicle in some embodiments of the present application; fig. 2 shows a schematic diagram of the battery of the vehicle in fig. 1.

Referring to fig. 1, a battery 100, a controller 200, and a motor 300 are disposed inside a vehicle 1000, and the battery 100 may be disposed at the bottom or the front or rear of the vehicle 1000, for example. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc.

In some embodiments of the present application, battery 100 may be used for power supply of vehicle 1000, for example, battery 100 may be used as an operating power source of vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for operation power demand at the start, navigation, and traveling of the vehicle 1000.

In other embodiments, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 1000.

Here, the battery 100 according to the embodiment of the present application refers to a single physical module including one or more battery modules 20 to provide higher voltage and capacity. For example, the battery 100 is formed by connecting a plurality of electric battery modules 20 in series or in parallel.

Referring to fig. 2, the battery 100 includes a case 10 and a battery module 20, and the battery module 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery module 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery module 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery modules 20 may be plural, and the plural battery modules 20 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to both the plural battery modules 20 being connected in series and in parallel. The plurality of battery modules 20 can be directly connected in series or in parallel or in series and parallel, and the whole formed by the plurality of battery modules 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery modules 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and the whole is accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery modules 20.

Referring to fig. 3, fig. 3 illustrates an exploded view of a battery module 20 according to some embodiments of the present application.

The present application provides a battery module 20. The battery module 20 includes a bottom plate (not shown), side plates 21, end plates 22, a top plate 23, and at least two cells 24. One side of the bottom plate close to the top plate 23 is provided with at least two fixing grooves 25, at least two battery cells 24 are arranged in one-to-one correspondence with the at least two fixing grooves 25, and the bottoms of the battery cells 24 are fixed in the corresponding fixing grooves 25. A first sealing strip 26 is arranged between any two adjacent battery cells 24, a second sealing strip 27 is arranged between each battery cell 24 and the side plate 21 and the end plate 22, and fixing glue (not shown) is filled between each first sealing strip 26, each second sealing strip 27, the top plate 23, each side plate 21 and each end plate 22.

The bottom plate is a plate-shaped structure for supporting the battery cells 24 in the battery module 20, and the material of the bottom plate may be metal or polymer material.

The fixing grooves 25 are groove structures disposed on the bottom plate and spaced apart from each other, and each fixing groove 25 has the same shape as the bottom of the battery cell 24, and the size of each fixing groove 25 may be the same as or slightly larger than the size of the bottom of the battery cell 24. The fixing groove 25 may be formed integrally with the bottom plate, or the fixing frame with the fixing groove 25 may be formed and then connected to the surface of the bottom plate, the fixing frame may be made of metal or polymer material, the polymer material may include plastic with a higher elastic modulus and rubber with a lower elastic modulus, for example, the fixing frame may be made of polypropylene, polyethylene, polyvinyl chloride or ethylene propylene diene monomer.

The side plate 21 is a plate-shaped structure for abutting against the side surface of the battery cell 24 in the battery module 20, and may be made of metal or polymer material.

The end plate 22 is a plate-shaped structure for abutting against the large surface of the battery cell 24 in the battery module 20, and may be made of metal or polymer material.

It is understood that the bottom plate, the side plates 21 and the end plates 22 may be integrally formed as a partial structure, for example, the bottom plate, the two side plates 21 and the one end plate 22 are integrally formed; the bottom plate, the side plates 21 and the end plates 22 can also be formed separately and connected to each other when being installed.

The top plate 23 is a plate-shaped structure for covering the battery module 20, and may be made of metal or polymer material.

The cells 24 may be arranged in one or more rows on the substrate with the large faces facing the large faces.

The first sealing strip 26 is a strip-shaped structure filled between any two adjacent battery cells 24, and two sides of the first sealing strip 26 abut against the two adjacent battery cells 24 respectively. When the anchoring adhesive reaches first sealing strip 26, first sealing strip 26 can prevent further flow of the anchoring adhesive. The first sealing strip 26 may be made of a polymer material, including a plastic with a higher elastic modulus and a rubber with a lower elastic modulus, where the plastic includes polypropylene, polyethylene or polyvinyl chloride, and the rubber includes ethylene propylene diene monomer, fluororubber or silicone rubber.

The second sealing strip 27 is a strip-shaped structure filled between the battery cell 24 and the side plate 21 and between the battery cell 24 and the end plate 22, and two sides of the second sealing strip 27 abut against the battery cell 24 and the side plate 21/the end plate 22 respectively. When the fixing glue solution reaches the second sealing strip 27, the second sealing strip 27 can prevent the fixing glue solution from continuously flowing, the second sealing strip 27 may be made of a high polymer material, including a plastic with a higher elastic modulus and a rubber with a lower elastic modulus, the plastic includes polypropylene, polyethylene or polyvinyl chloride, and the rubber includes ethylene propylene diene monomer, fluororubber or silicone rubber.

The bottom of every electric core 24 in the battery module 20 of this application is fixed in fixed slot 25 through the card, and the top of every electric core 24 is fixed through the fixed glue of packing between first sealing strip 26, second sealing strip 27 and roof 23 to realize whole electric core 24's fixed, reduce the vibration of electric core 24 top welding seam department in the use as far as possible, improve welding seam desoldering weeping's that electric core 24 vibration leads to in the use safety problem and life-span problem. In addition, because the effect of blockking up of first sealing strip 26 and second sealing strip 27 for the stationary glue exists in the region between first sealing strip 26, second sealing strip 27 and roof 23, realizes the partial injecting glue of electricity core 24, when reducing the vibration of electricity core 24 top welding seam department, can also control the injecting glue volume, further improves battery module 20 energy density.

According to some embodiments of the present application, optionally, please refer to fig. 3 to 6, fig. 4 is a schematic structural diagram of a plurality of arrangement cells 24 provided with a first sealing strip 26 and a second sealing strip 27 according to some embodiments of the present application, fig. 5 is a front view of the plurality of arrangement cells 24 provided with the first sealing strip 26 and the second sealing strip 27 according to some embodiments of the present application, and fig. 6 is a left view of the plurality of arrangement cells 24 provided with the first sealing strip 26 and the second sealing strip 27 according to some embodiments of the present application. The shortest distance from the first sealing strip 26 and the second sealing strip 27 between the cell 24 and the end plate 22 to the bottom plate is equal.

The first and

second beads

26, 27 may or may not be parallel to the base plate. When the first sealing strip 26 and the second sealing strip 27 are parallel to the bottom plate, each position of the first sealing strip 26 and the second sealing strip 27 is equal to the distance from the bottom plate; when the first and

second beads

26, 27 are not parallel to the base plate, the first and

second beads

26, 27 are present at the shortest distance from the base plate.

The first sealing tape 26 and the second sealing tape 27 located on the large surface side of the battery cell 24 have the same height, and the fixing adhesives on the two large surface sides of each battery cell 24 have the same height, so that the acting force of the fixing adhesives on the two large surface sides of each battery cell 24 is equal.

In other embodiments of the present application, the first sealing strip 26 and the second sealing strip 27 between the cell 24 and the end plate 22 may not be equidistant from the bottom plate. This results in unequal forces of fixation of each cell 24 on the two large-face sides.

According to some embodiments of the present application, optionally, with continued reference to fig. 3-6, the shortest distances from the first sealing strip 26 and the second sealing strip 27 to the bottom plate are equal.

All of the first sealing strips 26 and the second sealing strips 27 are equal in height, and the fixing glue located on each side of each cell 24 is equal in height, so that the force of the fixing glue on each cell 24 is substantially equal.

Alternatively, the first sealing tape 26 and the second sealing tape 27 are both linear.

It is understood that the first sealing tape 26 and the second sealing tape 27 are entirely linear in the extending direction thereof, i.e., the first sealing tape 26 and the second sealing tape 27 are linear regardless of the angle from which they are viewed.

Optionally, the first and second sealing strips 26, 27 are both parallel to the bottom or top plate 23.

According to some embodiments of the present application, optionally, the second sealing tape 27 is formed in a ring shape, and both ends of each first sealing tape 26 are connected or overlapped to the second sealing tape 27.

When the number of the second sealing strips 27 is 1, the second sealing strips 27 are formed in a closed structure; when the number of the second sealing strips 27 is 2 or more, a plurality of the second sealing strips 27 are connected end to end or overlapped in sequence to form a closed structure.

The overlapping refers to that the first sealing strip 26 and the second sealing strip 27 are overlapped in the height direction, so that no hollow or gap exists in the height direction of the first sealing strip 26 and the second sealing strip 27, and the downward flowing of the fixing glue is avoided.

The annular second sealing strip 27 can fill gaps among the side plate 21, the end plate 22 and the battery cell 24, so that the fixing glue is prevented from flowing to the bottom plate from the gaps among the side plate 21, the end plate 22 and the battery cell 24; both ends of each first sealing strip 26 are connected or lapped on the second sealing strip 27, so that the first sealing strips 26 can fill the gaps between any adjacent battery cells 24, and the fixing glue solution is prevented from flowing to the bottom plate from the gaps between any adjacent battery cells 24. The glue injection amount is controlled, and the energy density of the battery module 20 is further improved.

According to some embodiments of the present application, referring to fig. 7-8 optionally, fig. 7 is a schematic structural view of a first sealing strip 26 and a second sealing strip 27 integrally formed in some embodiments of the present application, and fig. 8 is a top view of the first sealing strip 26 and the second sealing strip 27 integrally formed in some embodiments of the present application. The first sealing tape 26 and the second sealing tape 27 are integrally formed.

The first sealing strip 26 and the second sealing strip 27 may be integrally formed structures, and when the battery cell is mounted, the integrally formed structures formed by the first sealing strip 26 and the second sealing strip 27 are directly sleeved on the plurality of battery cells 24. The integrated structure formed by the first sealing strip 26 and the second sealing strip 27 can further fix a plurality of battery cells 24, and reduce the vibration at the top welding seam of the battery cells 24 during use. Meanwhile, the integrally formed structure formed by the first sealing strip 26 and the second sealing strip 27 cannot slide randomly during glue injection, and the injection amount of the fixed glue solution can be strictly controlled.

The integral structure means that the integral structure is manufactured into a component during molding, and when the component is assembled, the component can be assembled only as a whole. The first and

second weatherstrips

26, 27 are formed as an integral structure, for example, by injection molding or compression molding.

In other embodiments of the present application, each of the first sealing strip 26 and the second sealing strip 27 may be formed separately. When the battery cells 24 are mounted, each first sealing strip 26 is clamped at a preset position between two adjacent battery cells 24, then the second sealing strip 27 is connected to the side wall of the battery cell 24 in a bonding manner or the like, and the joints of the first sealing strips 26 and the second sealing strips 27 can be connected in a bonding or overlapping manner; or after the first sealing strip 26 is installed at the preset position between two adjacent electric cores 24, the second sealing strip 27 is connected at the corresponding positions of the end plate 22 and the side plate 21 in a bonding mode or the like, so that after the end plate 22 and the side plate 21 are installed, the two ends of the first sealing strip 26 are just overlapped or abutted to the second sealing strip 27.

The abutting means that the end of the first sealing strip 26 presses the side wall of the second sealing strip 27 through the elastic action, so that no hollow or gap exists between the first sealing strip 26 and the second sealing strip 27 in the horizontal direction, and the fixing glue is prevented from flowing downwards.

According to some embodiments of the present application, optionally, referring to fig. 9, fig. 9 is a schematic size diagram of the battery cell 24, the first sealing tape 26, and/or the second sealing tape 27 in some embodiments of the present application. The height of the cell 24 is L₁The distance from the bottom of the first sealing strip 26 and/or the second sealing strip 27 to the top of the battery cell 24 is L₂，1/4L₁≤L₂＜L₁。

The bottom of the second sealing strip 27 is the end of the second sealing strip 27 close to the bottom plate.

The top of the battery cell 24 is the end of the battery cell 24 close to the top plate 23.

The distance L from the bottom of the first sealing strip 26 to the top of the cell 24₂Greater than or equal to 1/4L₁And is less than L₁During the process, the battery cell 24 can be well fixed through the fixing groove 25 of the bottom plate and the fixing glue, and the vibration of the top welding line of the battery cell 24 in the using process is reduced. When L is₂The smaller the value of (a), the higher the energy density of the battery module 20, and the worse the effect of relieving the vibration of the battery cell 24; when L is₂The larger the value of (a), the lower the energy density of the battery module 20, and the better the vibration effect of the battery cell 24 is relieved. Different battery module 20 select suitable injecting glue volume according to the service behavior, realize the maximize of electric core 24 safety and energy density.

According to some embodiments of the present application, optionally, referring to fig. 10 to 11, fig. 10 is a top view of a plurality of arrayed cells 24 provided with a first sealing strip 26 and a second sealing strip 27 in some embodiments of the present application, and fig. 11 is a partial size schematic diagram of fig. 10. The distance between two adjacent electric cores 24 is L₃，0＜L₃≤10mm。

The distance between two adjacent battery cells 24 is the distance between two adjacent large faces of two adjacent battery cells 24.

The fixing glue is filled in a partial area of a gap between two adjacent electric cores 24, when the distance between two adjacent electric cores 24 is greater than 0 and less than or equal to 10mm, the fixing glue can realize the effect of fixing the electric cores 24, the using amount of the fixing glue can be reduced as much as possible, and the energy density of the battery module 20 is improved.

Alternatively,0＜L₃≤3mm。

alternatively, 0.5 ≦ L₃≤1.5mm。

Referring to fig. 12, according to some embodiments of the present application, and optionally, fig. 12, a schematic size view of a first sealing strip 26 and a second sealing strip 27 integrally formed in some embodiments of the present application is shown. The first sealing tape 26 has a width L₄，L₃≤L₄≤1mm+L₃。

The width of the first sealing tape 26 refers to its width in the direction in which the cells 24 are arranged.

The width of the first seal tape 26 is equal to or greater than L₃And is less than or equal to 1mm + L₃During the process, the width of the first sealing strip 26 may be equal to the distance between two adjacent battery cells 24, or slightly wider than the distance between two adjacent battery cells 24, after the battery cells 24 are installed, the two adjacent battery cells 24 extrude the first sealing strip 26, the first sealing strip 26 deforms, and the width decreases.

Alternatively, L₃≤L₄≤0.6mm+L₃。

Alternatively, L₃≤L₄≤0.3mm+L₃。

According to some embodiments of the present application, optionally, referring to fig. 12, the height of the battery cell 24 is L₁The first sealing strip 26 and/or the second sealing strip 27 have a thickness L₅，0＜L₅≤1/2L₁。

The thickness of the first sealing tape 26 and/or the second sealing tape 27 is greater than 0 and equal to or less than 1/2L₁In this case, the first sealing strip 26 and/or the second sealing strip 27 can prevent the fixing glue from flowing continuously, and the energy density of the battery module 20 is not increased to a great extent.

Alternatively, 0 < L₅≤1/6L₁。

Alternatively, 0 < L₅≤1/15L₁。

According to some embodiments of the present application, the material of the first sealing strip 26 and/or the second sealing strip 27 is optionally soft rubber.

The friction force between the soft rubber and the battery cell 24, the side plate 21 and the end plate 22 is large, and the first sealing strip 26 and/or the second sealing strip 27 cannot slide randomly during glue injection, so that the glue injection amount is strictly controlled.

The soft rubber is a vulcanized rubber having a low sulfur content and being excellent in elasticity and flexibility.

Optionally, the material of the first sealing strip 26 and/or the second sealing strip 27 is corrosion-resistant soft rubber.

Optionally, the first sealing strip 26 and/or the second sealing strip 27 are made of epdm, viton or silicone rubber.

The battery module 20 of the present application will be described in further detail with reference to examples.

Example 1

Referring to fig. 1, an embodiment of the present application provides a battery module 20, where the battery module 20 includes a bottom plate, two side plates 21, two end plates 22, a

top plate

23, and 12 battery cells 24, one side of the bottom plate close to the top plate 23 has 12 fixing slots 25, the 12 battery cells 24 are sequentially arranged in the 12 fixing slots 25 in a manner that a large surface faces the large surface, and a distance L between any two adjacent battery cells 24 is provided₃1 mm; the first sealing strip 26 and the second sealing strip 27 are integrally formed and sleeved at the middle parts of the 12 battery cells 24, and the distance from the bottoms of the first sealing strip 26 and the second sealing strip 27 to the top of the battery cell 24 is L₂＝1/4L₁Fixing glue is filled among the first sealing strip 26, the second sealing strip 27, the top plate 23, the side plate 21 and the end plate 22.

Example 2

top plate

23, and 12 battery cells 24, one side of the bottom plate close to the top plate 23 has 12 fixing slots 25, the 12 battery cells 24 are sequentially arranged in the 12 fixing slots 25 in a manner that a large surface faces the large surface, and a distance L between any two adjacent battery cells 24 is provided₃1 mm; the first sealing strip 26 and the second sealing strip 27 are integrally formed and sleeved at the middle parts of the 12 battery cells 24, and the distance from the bottoms of the first sealing strip 26 and the second sealing strip 27 to the top of the battery cell 24 is L₂＝1/2L₁Fixing glue is filled among the first sealing strip 26, the second sealing strip 27, the top plate 23, the side plate 21 and the end plate 22。

Example 3

top plate

23, and 12 battery cells 24, one side of the bottom plate close to the top plate 23 has 12 fixing slots 25, the 12 battery cells 24 are sequentially arranged in the 12 fixing slots 25 in a manner that a large surface faces the large surface, and a distance L between any two adjacent battery cells 24 is provided₃1 mm; the first sealing strip 26 and the second sealing strip 27 are integrally formed and sleeved at the middle parts of the 12 battery cells 24, and the distance from the bottoms of the first sealing strip 26 and the second sealing strip 27 to the top of the battery cell 24 is L₂＝3/4L₁Fixing glue is filled among the first sealing strip 26, the second sealing strip 27, the top plate 23, the side plate 21 and the end plate 22.

Comparative example 1

The application comparative example provides a battery module, and battery module includes bottom plate, two curb plates 21, two end plates, roof and 12 electric cores, and the one side that the bottom plate is close to the roof has 12 fixed slots, and 12 electric cores arrange in 12 fixed slots in proper order with the big face to the mode of big face, the interval L of two arbitrary adjacent electric cores₃1 mm; the gaps among the bottom plate, the top plate, the side plates and the end plates are all filled with fixing glue.

Comparative example 2

The application comparative example provides a battery module, and battery module includes bottom plate, two curb plates 21, two end plates, roof and 12 electric cores, and 12 electric cores arrange on the bottom plate in proper order with big face to big face's mode, adopt the mode bonding of two-sided adhesive with the blotter between arbitrary two adjacent electric cores, and the interval L of arbitrary two adjacent electric cores₃＝1mm。

Test examples

The battery modules of examples 1-3 and comparative examples 1-2 were placed at frequencies of 5Hz and 15Hz respectively for a fixed frequency vibration test, after 24 hours of vibration, the appearance integrity of the battery modules was observed, the number of the battery modules of each example and comparative example was 5, and the test results are shown in tables 1 and 2:

TABLE 1 phenomena after vibration of the battery modules of examples 1 to 3 and comparative examples 1 to 2 at 5Hz for 24 hours

TABLE 2 phenomena after the battery modules of examples 1 to 3 and comparative examples 1 to 2 were vibrated at 15Hz for 24 hours

As can be seen from tables 1 and 2, the larger the amount of injected glue, the better the effect of alleviating the cell vibration; the faster the vibration frequency, the more glue injection is needed.

Compare in the mode of the rubberizing that comparative example 2 disclosed, the battery module of this application embodiment can satisfy electric core safety demand.

When the battery service condition is different from the requirement of life, the first sealing strip and the second sealing strip can be arranged at different heights according to the vibration degree of the target battery under the actual service condition, and then the injection amount of the fixed glue solution is controlled, so that the safety of the battery core and the maximization of the energy density are realized.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. 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.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module (20), comprising:

a base plate having at least two fixing slots (25) thereon;

the battery cell fixing structure comprises at least two battery cells (24), the battery cells (24) and the fixing grooves (25) are arranged in a one-to-one correspondence mode, the bottoms of the battery cells (24) are fixed in the corresponding fixing grooves (25), and a first sealing strip (26) is arranged between every two adjacent battery cells (24);

the battery cell comprises a side plate (21) and an end plate (22), wherein second sealing strips (27) are arranged between the battery cell (24) and the side plate (21) and between the battery cell and the end plate (22);

the top plate (23), it is filled with fixed glue between first sealing strip (26), second sealing strip (27) and top plate (23).

2. The battery module (20) of claim 1, wherein the first sealing strip (26) and the second sealing strip (27) between the cell (24) and the end plate (22) are equidistant from the bottom plate.

3. The battery module (20) according to claim 1, wherein the shortest distance from the first bead (26) and the second bead (27) to the bottom plate is equal.

4. The battery module (20) according to any one of claims 1 to 3, wherein the second sealing tape (27) is formed in a ring shape, and both ends of each of the first sealing tapes (26) are connected or overlapped to the second sealing tape (27).

5. The battery module (20) according to any one of claims 1 to 3, wherein the first sealing tape (26) and the second sealing tape (27) are integrally formed.

6. The battery module (20) according to any one of claims 1 to 5, wherein the height of the battery cell (24) is L₁The distance from the bottom of the first sealing strip (26) and/or the second sealing strip (27) to the top of the battery cell (24) is L₂，1/4L₁≤L₂＜L₁。

7. The battery module (20) according to any one of claims 1 to 6, wherein the distance between two adjacent battery cells (24) is L₃，0＜L₃≤10mm。

8. The battery module (20) according to claim 7, wherein the first sealing strip (26) has a width L₄，L₃≤L₄≤1mm+L₃。

9. The battery module (20) according to any one of claims 1 to 8, wherein the height of the battery cell (24) is L₁The first sealing strip (26) and/or the second sealing strip (27) have a thickness L₅，0＜L₅≤1/2L₁。

10. The battery module (20) according to any one of claims 1 to 9, wherein the first sealing tape (26) and/or the second sealing tape (27) is made of a soft rubber.

11. A battery comprising the battery module (20) according to any one of claims 1 to 10.

12. An electric device, characterized in that the electric device comprises the battery module (20) according to any one of claims 1-10, and the battery module (20) is used for providing electric energy.