CN212848568U - Laminate polymer battery module - Google Patents

Abstract

The utility model discloses a soft package battery module, which comprises a battery cell group, a left side plate, a right side plate, an upper cover plate, a lower cover plate, a front side plate and a rear side plate, wherein the left side plate and the right side plate are arranged outside the battery cell group; the left side plate and the right side plate are connected with the upper cover plate, the lower cover plate and/or the front side plate and the rear side plate, so that pretightening force applied to the battery cell by the left side plate and the right side plate before connection is converted into pressure pointing to the battery cell after connection, and the connection at least comprises welding; at least one heat insulation plate is arranged between the left side plate and the right side plate and between the electric core group; the left side plate, the right side plate, the upper cover plate, the lower cover plate and the front side plate are connected to encapsulate the battery cell; the battery pack comprises foam, the left side plate and the right side plate are parallel to or in the same direction with the plane of the battery piece, and the front side plate and the rear side plate are perpendicular to the left side plate, the right side plate and the horizontal plane. The soft package battery module of the utility model overcomes the problem of battery core expansion; the arrangement of the heat insulation plate can avoid adverse effects of heat generated by external welding on the internal electric core; the arrangement of the polylactic acid forming the heat absorption layer can better ensure the stability of the battery core.

Description

Laminate polymer battery module

Technical Field

The utility model relates to a battery technology field relates to a laminate polymer battery module, especially relates to a laminate polymer battery module convenient to pretension and assembly.

Background

The lithium ion power battery is taken as a core component of the new energy automobile at present, and the performance of the lithium ion power battery directly determines the development key of the new energy automobile. When the lithium ion battery is charged, lithium ions are extracted from the positive electrode, and are inserted into the negative electrode graphite, and the negative electrode expands. During discharge, lithium ions are extracted from the negative electrode and inserted into the layered positive electrode material to expand. Meanwhile, in the aging process of the battery, the electrolyte can generate gas to cause the expansion of the thickness of the battery. This life and the circulation that not only influences the battery holds the electric potential to the electric core of module moreover, and size design brings very big influence. And tests prove that a certain pre-tightening force for the lithium battery is greatly improved in performance and circulation compared with a clamping-free device.

In the actual assembly process, the battery core is firstly added into the outer frame, then the pretightening force is applied to the outer frame from the side surface,

the excellent outer frame design needs to simultaneously meet two aspects of easy assembly and good pretightening force application. At present, the outer frame structure of the soft package battery module is commonly provided with an n, a u and an opening; all three of the above structures have some technical and structural drawbacks. In order to enable the outer frame to continuously apply pretightening force to the battery cell, the technical scheme that the size of the battery cell is equal to or slightly larger than the size of the inner part of the outer frame is favorable, but in the actual operation process, if the size of the battery cell is larger than or equal to the size of the outer frame, because the outer frame structure and the battery cell are rigid structures, the elastic deformation is small, when the sizes of the battery cell and the battery cell are equal to or larger than the size of the outer frame, the installation is very difficult, the battery cell is difficult to put into the outer frame by manpower, and if a mechanical tool is used for applying mechanical force, on one hand, the outer frame or the battery cell is easy to damage, on the other hand, the tool is difficult to enter;

if the size of the battery cell is smaller than that of the outer frame, although the assembly efficiency can be improved, under the condition, the pre-tightening force is absorbed by the outer frame, the pre-tightening force application effect is poor, and after the outer frame absorbs the pre-tightening force, deformation is easily generated due to the fact that no battery applies corresponding pressure on the inner side, and the product is not in accordance with the design requirement.

Therefore, for the existing three outer frame structures of 'n', 'u' and 'opening', the assembly efficiency and the effective applied pretightening force are irreconcilable contradictions.

CN 109346630A discloses a laminate polymer battery module structure, including an aluminum shell frame (9), characterized by also including an integrally formed reverse S-shaped aluminum plate (8), the upper end face, the lower end face and the opening position of the reverse S-shaped aluminum plate (8) are filled with a laminate polymer battery core pack; the soft-package battery core group comprises two soft-package battery cores (12); the soft package battery cell (12) and the reverse S-shaped aluminum plate (8) are fixed and then integrally inserted into the aluminum shell outer frame (9), and the side surface of the reverse S-shaped aluminum plate (8) is in contact with the inner side surface of the aluminum shell outer frame (9); an integrated cover plate (7) is arranged at one end of the aluminum shell outer frame (9), and a tab (6) of the soft package battery cell (12) is embedded into the integrated cover plate (7) and led out through an insulating plate (3), and then is fixedly sealed through a right insulating cover plate (2) and a right fixed end plate (1); the other end part of the aluminum shell outer frame (9) is fixedly sealed through a left insulating cover plate (11) and a left fixed end plate (10); the reverse S-shaped aluminum plate (8) is of an integrally formed structure. The soft package battery is simple in assembly process and easy to operate, and the production efficiency of products is improved.

CN 109411667A discloses laminate polymer battery module, its characterized in that: the soft package battery comprises a bottom plate, a protection frame assembly, at least two soft package battery cores arranged in parallel, at least one first insulating plate, at least one second insulating plate, at least one first busbar used for leading out the positive electrode of each soft package battery core and at least one second busbar used for leading out the negative electrode of each soft package battery core, wherein the protection frame assembly is arranged on the bottom plate in a surrounding manner, the first insulating plate, the second insulating plate, the first busbar and the second busbar are arranged on the bottom plate, a spacing piece used for heat insulation is arranged between the soft package battery cores, the bottom of each soft package battery core is connected to the bottom plate through a heat-conducting adhesive material, the positive lug of each soft package battery core is connected with the first side face of the first busbar through a first adhesive, and the negative lug of each soft package battery core is connected with the first side face of the second busbar through the first adhesive, the second side surface of the first busbar is fixedly connected with the first side surface of the first insulating plate through the first adhesive, the second side surface of the second busbar is fixedly connected with the first side surface of the second insulating plate through the first adhesive, and the second side surface of the first insulating plate and the second side surface of the second insulating plate are respectively and fixedly connected to the inner side of the protective frame assembly through the second adhesive. The gap between the insulation board of this laminate polymer battery module and the busbar, between busbar and the laminate polymer battery core is filled with first adhesive, and the insulation board bonds through the second adhesive with the curb plate and is in the same place, and frame and other the structure that plays the fixed action in the current battery module can be replaced to first adhesive and second adhesive, are guaranteeing still to have reduced laminate polymer battery module's weight by a wide margin after the fixed of battery module structure. However, the positional relationship of the plates of the module is revealed only by the explosion diagram, the connection relationship of the plates and the blocks of the module is not involved, and the problem that the module cannot be installed and pre-tightened cannot be solved.

For this reason, the applicant disclosed in the prior patent documents that the left and right side plates, the upper and lower cover plates, and the front and rear side plates are assembled by detachable connection, so that the tool can indirectly act on the battery cell through the left and right side plates during installation, and meanwhile, in order to ensure continuous application of pretightening force, the front and rear side plates or the upper and lower cover plates are fixedly connected to the left and right side plates by interference fit connection, so as to continuously apply pressure directed to the battery cell to the left and right side plates; although the problems of pre-tightening force and installation of the module are solved by the installation mode, the strength of the module is difficult to ensure only by a mechanical connection mode due to the existence of interaction force between the left side plate, the right side plate, the upper cover plate, the lower cover plate and/or the front side plate and the rear side plate, and therefore the module needs to be fixed by welding and the like.

However, the applicant finds that the cell performance is deteriorated due to the excessively high welding temperature, and the stable use of the battery is influenced. Therefore, compromise laminate polymer battery module assembly efficiency and effectively exert the pretightning force in the time, still need further improve the structure in order to reduce the adverse effect that external heat caused to electric core.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem that exists among the prior art, the utility model aims to provide a laminate polymer battery module especially lies in providing a laminate polymer battery module convenient to pretension and assembly.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a soft package battery module, the soft package battery module comprises a battery cell group, a left side plate, a right side plate, an upper cover plate, a lower cover plate, a front side plate and a rear side plate, wherein the left side plate and the right side plate are arranged outside the battery cell group;

the left side plate and the right side plate are connected with the upper cover plate, the lower cover plate and/or the front side plate and the rear side plate, so that pre-tightening force applied to the battery cell by the left side plate and the right side plate before connection is converted into pressure pointing to the battery cell after connection, and the connection at least comprises welding;

at least one heat insulation plate is arranged between the left side plate and the right side plate and between the electric core group;

the left side plate, the right side plate, the upper cover plate, the lower cover plate, the front side plate and the rear side plate are connected to encapsulate the battery cell to form a soft package battery module;

the battery pack comprises foam, the left side plate and the right side plate are parallel to or in the same direction with the plane of the battery piece, and the front side plate and the rear side plate are perpendicular to the left side plate, the right side plate and the horizontal plane.

The utility model discloses in, the pretightning force indicates that electric core is from electric core side face applied force before curb plate and upper and lower apron and/or front and back curb plate are connected about, for example can press from both sides tight left side board, right side board and be located the electric core group between the two and apply the pretightning force through the frock, and the pretightning force can be obtained through current testing arrangement, and the pretightning force can directly transmit to electric core through controlling the curb plate unattenuated.

The utility model discloses in, the effort that the curb plate lasts to exerting about to the curb plate is lapped or around to about the pressure indicates about, it is about the curb plate with lap and/or around the curb plate be connected after obtaining. Taking the connection of the left and right side plates with the upper and lower cover plates as an example, the pressure can be obtained by the interference fit connection mode between the upper and lower cover plates and the left and right side plates; alternatively, the upper cover plate and the lower cover plate can be directly installed at corresponding positions of the left side plate and the right side plate under the condition that the pretightening force is not released, and then the upper cover plate and the lower cover plate are directly fixed through welding.

Therefore, even if the pre-tightening force is removed by the tool applying the pre-tightening force, the upper cover plate and the lower cover plate still apply pressure to the left side plate and the right side plate due to factors such as mechanical deformation, and the left side plate and the right side plate apply corresponding pressure to the battery cell so as to achieve the purpose of pre-tightening.

The same structure or principle is also applicable to the front and rear side plates, and technicians can select the front and rear side plates or the upper and lower cover plates to apply the pressure for maintaining the pre-tightening to the left and right side plates according to the design requirements of the module, and can also apply the pressure through the upper and lower cover plates or the front and rear side plates simultaneously.

As an embodiment of the present invention, the pressure and the pre-tightening force may be equal, that is, the difference between the pressure and the pre-tightening force should be only within the error range; as an error, the difference between the pressure and the preload should not be greater than 10%, i.e., P (pressure)/P (preload) is 90% to 110%; preferably, the error range is not more than 5%.

During module design, pressure can be designed to be different in pretightening force according to the actual condition of the module, for example, a smaller value can be used as the pretightening force of initial pretightening, a larger value can be selected as the pressure continuously existing after the module is assembled, and a two-step pretightening mode is adopted to realize the pretightening; similarly, it is also possible to use a larger value for the pretension and a smaller value for the pressure.

The big or small relation of above-mentioned pretightning force and pressure can be adjusted according to the module design, and the requirement of the big or small relation between pretightning force-pressure is different for different modules, should think that above-mentioned technical scheme all is in the utility model discloses an within the scope of protection.

The utility model discloses an among the laminate polymer battery module, electric core group includes a plurality of (also at least two) electric cores, and two at least electric cores are a set of, and the interval is provided with the bubble cotton between every group electric core.

In the soft package battery module, the battery cell is always subjected to corresponding pre-tightening pressure in the assembling process, so that the problem caused by the expansion of the battery cell is effectively solved; moreover, the welding connection ensures that the frame structure cannot be out of work due to the expansion deformation at the end of the service life of the battery cell; furthermore, all be provided with an at least heat insulating board between left side board and the right side board and the electric core group, can avoid the heat that outside welding produced to cause adverse effect to inside electric core better.

The utility model discloses a laminate polymer battery module, electric core have received corresponding pretension pressure throughout in assembling process, pretension pressure includes: the pretightening force that the electric core received before the curb plate was connected with upper and lower apron and/or front and back curb plate about with to and the pressure that the electric core received after the connection.

The utility model discloses in, left side board and right side board set up relatively, the upper cover plate sets up relatively with lower apron, preceding curb plate sets up relatively with the posterior lateral plate.

As the preferred technical scheme of laminate polymer battery module, the heat insulating board is close to electric core side (also can be called inboard) and still is provided with the absorber plate, the absorber plate adopts the combination of arbitrary one or two kinds in physics cooling plate or the chemistry absorber plate.

The physical cooling plate comprises: a cooling plate provided with a flow passage for circulating a cooling liquid (e.g., cooling water). But not limited to the above-mentioned mode, other cooling modes that can be used alternatively in the cooling plate are also suitable for the utility model.

The chemical heat absorption plate comprises: an absorber plate comprising an endothermic material that undergoes an endothermic reaction when heated. The utility model discloses do not do specifically and restrict the material kind that takes place endothermic reaction to being heated, the temperature of being heated is relevant with the selection of kind, for example if avoid producing adverse effect to electric core because of the laser welding heat production, then the material of selection needs to take place endothermic reaction below received temperature to reach its absorption welding heat's of effective performance purpose.

Preferably, neither the starting material nor the product of the endothermic reaction is a gas-free reaction.

Preferably, the endothermic reaction is irreversible. After the endothermic reaction (for example, welding heat triggers the endothermic reaction), the endothermic reaction is not acted after the battery is used, and the arrangement can avoid the influence of the heat absorbing plate on the heat distribution of the battery in the use process to the greatest extent.

The endothermic reaction of the present invention is not particularly limited, and may be, for example, a crystalline phase endothermic reaction or a phase transition reaction.

Preferably, the endothermic reaction raw material is capable of reacting at 60 to 80 ℃, and as an embodiment, the endothermic material is polylactic acid.

Particularly preferably, polylactic acid is used as the heat absorbing material, and is known to have a glass transition at 60 to 80 ℃ and a strong endothermic peak in the vicinity of the temperature range; through modes such as thermal analysis simulation or thermal probe test, the temperature of the side of the electric core is still 60-80 ℃ after high heat generated in the welding process is isolated by the thermal insulation plate, and the temperature needs to be further reduced for better protecting the electric core. Therefore, the heat absorbing plate which can absorb heat rapidly within the range of 60-80 ℃ is arranged on the side of the battery cell, so that the heat absorbing plate plays an important role in stabilizing the battery cell, and a polylactic acid layer is preferably formed on the side, close to the battery cell, of the heat insulating plate, namely the obtained heat insulating plate and heat absorbing plate composite plate; therefore, the polylactic acid is coated on the heat insulation plate, so that the polylactic acid can absorb a large amount of heat through glass transition when the temperature exceeds 60 ℃ in the welding process, and the effect of protecting the battery core is achieved. Polylactic acid is used as a heat absorbing material, no special requirement is required for the structure of the heat absorbing plate, the preparation is simple, and the heat absorbing peak of the polylactic acid is completely matched with the temperature of the core side of the heat insulating plate, so that the polylactic acid is a particularly suitable material for the application.

Preferably, adopt modified polylactic acid (PLA) as heat absorbing material, PLA is a class of crystalline polymer that has a higher melting point, but crystallization rate is slower, leads to its heat distortion temperature lower, and this is unfavorable to the utility model discloses, therefore, the utility model discloses in, as preferred scheme, adopt modified polylactic acid as heat absorbing material, preferably, adopt the talcum powder to modify PLA, more preferably adopt 5-15 wt% talcum powder modified polylactic acid, in this talcum powder content scope, PLA is at 90-110 ℃'s crystallization rate and improves by a wide margin for when electricity core side temperature is too high, PLA can pass through the crystallization and absorb the heat fast, and makes PLA's heat resistance improve through the modification, does benefit to the stability of electricity core.

The utility model discloses a "5-15 wt% talcum powder modified polylactic acid" indicates: the total mass of the talcum powder modified polylactic acid is 100 wt%, and the mass percentage of the talcum powder in the talcum powder modified polylactic acid is 5-15 wt%.

The preparation method of the talc modified polylactic acid is known in the art, for example, the talc and the PLA are mixed in an internal mixer, and the mixing temperature is not particularly limited, and can be 100-200 ℃.

The utility model discloses creative use polylactic acid especially the modified polylactic acid of talcum powder as heat absorbing material, introduce the absorber plate in, with heat insulating board mating reaction, the inside temperature of electric core just matches when going on with this application welding process, can not only pass through the isolated most welding heat of heat insulating board, can also absorb the waste heat through this specific heat absorbing material, especially can obtain suitable crystallization rate, effective absorption heat under the prerequisite of non-deformability, thereby avoid the heat that outside welding produced to cause adverse effect to inside electric core better.

Preferably, the heat absorbing plate and the heat insulating plate are arranged in the following manner: and coating a heat absorption material which is heated to generate heat absorption reaction on the heat insulation plate, and drying to form the heat absorption plate on the surface of the heat insulation plate.

Preferably, the heat insulation plate is a high-temperature resistant material, preferably a mica layer.

Preferably, the thickness of the thermal insulation panel is 1mm to 10cm, such as 1mm, 5mm, 1cm, 2.5cm, 5cm, 7cm, 8cm or 9cm, etc.

The utility model discloses the preferred mica sheet that adopts is as the heat insulating board, and the short time can be able to bear or endure 1000 ℃ high temperature, can bear or endure high temperature more than 500 ℃ for a long time.

Preferably, pressure-sensitive adhesive and/or heat-conducting adhesive are/is arranged between the electric cores, and the heat-conducting adhesive and the pressure-sensitive adhesive are mixed on the plane of the electric cores on the same layer to improve the temperature uniformity between the electric cores. The utility model discloses do not injecing the specific kind of heat-conducting adhesive and pressure-sensitive adhesive, the heat-conducting adhesive that prior art disclosed and pressure-sensitive adhesive all are applicable to the utility model discloses.

Preferably, the left and right side plates are fixedly connected with the upper and lower cover plates or the front and rear side plates in a detachable connection mode and then welded.

The utility model discloses it is right can dismantle the mode of connecting does not limit, can be the common connected mode of prior art, for example conventional mechanical cooperation mode, preferably include buckle, block or adopt bolt and/or nut to connect. The connection between the left side plate, the right side plate, the upper cover plate and the lower cover plate is used as an example, the contact part of the upper cover plate and the side plate can be set to be a bending part, the distance between the two bending parts of the cover plate is slightly smaller than or equal to the lateral width of the whole module, and the upper cover plate and the side plate form interference fit to form a tight structure. The upper cover plate and the lower cover plate may be provided with protrusions (the shape is not limited, for example, a cone shape) respectively, and the left and right side plates may be provided with grooves capable of accommodating the protrusions, so that the upper and lower cover plates may be engaged with the side plates.

Preferably, the welding comprises laser welding.

Preferably, the heat insulation plate is connected with the left/right side plate through heat insulation glue.

Preferably, the heat absorbing plate is connected with the electric core group through a heat insulation glue.

As a laminate polymer battery module's preferred technical scheme, the curb plate is any one of following two kinds of forms around:

the front side plate and the rear side plate are front end cover assembling plates and rear end cover assembling plates which are arranged oppositely;

secondly, the front and rear side plates include: the battery pack comprises a front end cover assembling plate, a rear end cover assembling plate, a front cover plate assembling plate and a rear cover plate assembling plate, wherein the front end cover assembling plate and the rear end cover assembling plate are oppositely arranged, the front cover plate assembling plate and the rear cover plate assembling plate are oppositely arranged, and the front cover plate assembling plate and the rear cover plate assembling plate are respectively positioned on one side, close to the battery core, of the front end cover assembling plate and the rear end cover.

Preferably, the front cover plate assembly plate comprises a copper bar and a plate groove for supporting the copper bar, the electric core is connected to the copper bar through a wire to form a complete circuit loop, the plate groove is arranged in the front cover plate assembly plate to play a role in supporting the copper bar, and the copper bar and the electric core lug are isolated simultaneously to prevent the contact between the copper bar and the electric core lug.

Preferably, the front end cover assembly plate consists of a front end cover and an insulating plate, and the insulating plate physically isolates the copper bars to prevent electric leakage and short circuit.

Preferably, the back shroud assembly plate includes the copper bar and supports the board groove of copper bar, the electric core line forms complete circuit loop on the copper bar, and the board groove sets up in the back shroud assembly plate, plays the effect of supporting the copper bar, keeps apart copper bar and electric core utmost point ear simultaneously, prevents both contacts.

Preferably, the rear end cover assembly plate is composed of an end cover and an insulating plate, and the insulating plate physically isolates the copper bars to prevent electric leakage and short circuit.

Preferably, still be provided with the FPC pilot board between upper cover plate and the electric core group, the FPC pilot board includes flexible line way board and FPC backup pad, set up limit structure in the FPC backup pad for fixed flexible line way board, be provided with temperature acquisition piece and voltage acquisition piece on the flexible line way board.

The utility model discloses a laminate polymer battery module forms a whole that has certain intensity and rigidity through modes such as welding and gluing to guarantee the reliability of electric core in the frame construction.

The heat insulation plate is arranged between the left side plate, the right side plate and the battery cell, or the heat insulation plate and the heat absorption plate are arranged at the same time, so that the influence of high temperature on the performance of the battery cell in the welding (such as laser welding) process of the left side plate, the right side plate, the upper cover plate, the lower cover plate and/or the front side plate and the rear side plate can be.

Preferably, the left and right side plates, the upper and lower cover plates, the front end cover and the rear end cover are made of aluminum materials, and high-strength aluminum materials are preferred.

Preferably, the left and right side plates are formed by stamping or extrusion.

Preferably, the upper cover plate and the lower cover plate are formed by stamping or bending.

Preferably, the front end cover and the rear end cover are formed by extrusion or casting.

As a preferred technical scheme of laminate polymer battery module, the width of upper and lower apron can be adjusted according to electric core and the cotton pretension requirement of bubble.

The utility model also provides an assembly method as in the first aspect laminate polymer battery module, the method includes following step:

(1) at least one heat insulation plate is respectively stacked on two sides of the electric core group, then a left side plate and a right side plate are respectively stacked, and pretightening force is applied in the width direction of the module to clamp the module;

(2) under the tight condition of maintenance clamp, with upper cover plate and lower apron respectively with left side board and right side board be connected, and/or be connected preceding curb plate and posterior lateral plate respectively with left side board and right side board for a set of or two sets of in upper and lower apron, the front and back curb plate exert the pressure of directional electric core to controlling the curb plate, form laminate polymer battery module.

The utility model discloses step (2) a set of or two sets of, can be a set of upper and lower apron, also can be a set of curb plate around, can also be a set of upper and lower apron and a set of curb plate around.

As the preferable technical proposal of the method of the utility model, a heat absorbing plate is arranged between the electric core group and the heat insulating plate.

As an embodiment of the present invention, in the step (2), the left and right side plates and the upper and lower cover plates and/or the front and rear side plates to which the pressure is applied may be directly connected by welding.

As another embodiment of the present invention, in step (2), the left and right side plates and the upper and lower cover plates or the front and rear side plates can be connected by interference fit, so that the left and right side plates and the upper and lower cover plates can apply pressure to the left and right side plates, for example, any one group of plates in the front and rear side plates or the upper and lower cover plates is fixedly connected by the detachable connection mode, and then the plates are released and clamped, and then the left side plate, the right side plate, the upper cover plate, the lower cover plate, the joint of the front side plate and the rear side plate is connected by the detachable connection mode. In this scheme, the left and right sides board and the inside electric core group that contains the bubble cotton are in clamping state when the assembly, and apron/front and back curb plate has detachable construction (for example buckling structure) with the left and right sides apron about, and the release is pressed from both sides tightly after can dismantling the connection, and apron/front and back curb plate belongs to the interference fit state with the left and right sides board about this moment.

The utility model discloses an among the method, if the preceding curb plate includes front end housing assembly plate and front shroud assembly plate, the posterior lateral plate includes rear end housing assembly plate and back shroud assembly plate, then carries out according to following mode:

the front cover plate and the rear cover plate are connected with each other before the front end cover assembly plate and the rear end cover assembly plate are connected with each other. For example, the front cover plate assembly plate and the rear cover plate assembly plate are detachably connected with the left side plate and the right side plate respectively, then the clamping is released, and finally the upper cover plate, the lower cover plate, the front end cover assembly plate and the rear end cover assembly plate are connected with the left side plate, the right side plate, the upper cover plate assembly plate and the lower cover plate assembly plate.

As a preferred technical solution of the method of the present invention, the method further comprises performing the following operations after the step (2): and sealing the joints of the front side plate, the rear side plate, the left side plate, the right side plate, the upper cover plate and the lower cover plate.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) this application has abandoned "n", "u", "three kinds of frame structures of mouth" apron about with three or four combinations formation integrated device of curb plate, with electric core "stopper" go into the technical scheme of this kind of structure, the utility model provides a laminate polymer battery module, outer frame include about apron, about curb plate and front and back curb plate, six parts that correspond are independent structure, about curb plate and its upper and lower apron and/or front and back curb plate of exerting pressure are connected to these six parts can be dismantled to connect (for example through block device interconnect each other) or adopt welded mode to connect, form laminate polymer battery outer frame. And simultaneously, the utility model discloses a welded mode is fixed to set up the heat insulating board or set up heat insulating board and absorber plate simultaneously about the combination of electric core between the curb plate, both guaranteed that frame construction can not become invalid because of electric core last stage of life dilatancy, guaranteed again can not cause adverse effect to inside electric core because of the heat that outside welding produced.

(2) The utility model discloses a method, because stack left and right side board to electric core group side earlier for the frock can apply required pretension to electric core, through suitable pretension, there is very big improvement to the wholeness ability of battery, simultaneously, can design the board and the front and back end cover board of upper and lower cover battery according to actual demand, consequently, the whole assembly efficiency of battery obtains very big improvement, because of size problem when apron or front and back end cover board about can not having the assembly, lead to the unable puzzlement that gets into or withdraw from of frock.

(3) The utility model discloses creative modes such as thermal analysis simulation or heat probe test of passing through, obtain, the inside temperature distribution of electric core during the welding, and then obtain, the welding process produces the high heat and still has 60-80 through the temperature of heat insulating board isolation back electric core side, select specific polylactic acid especially 5-15wt talcum powder modified polylactic acid as heat absorbing material, introduce into the absorber plate, with heat insulating board mating reaction, can not only pass through the isolated most welding heat of heat insulating board, can also absorb the waste heat through this specific heat absorbing material, especially can obtain suitable crystallization rate, when polylactic acid itself 60-80 ℃'s the unable digestion heat of heat absorption, further change the heat absorption through the crystalline phase, thereby avoid the heat that outside welding produced to cause adverse effect to inside electric core better.

Drawings

FIG. 1 is an exploded view of the detachable module of the present invention;

FIG. 2 is a schematic structural view of the cell assembly of the present invention;

FIG. 3 is a schematic view of the fastening structure of the detachable module of the present invention, wherein the upper and lower cover plates are connected to the left and right side plates;

FIG. 4 is a schematic structural view of the FPC assembly board of the present invention;

FIG. 5 is a schematic structural view of a front cover plate assembly plate of the present invention;

FIG. 6 is a schematic structural view of the front end cover assembly plate of the present invention;

FIG. 7 is a schematic view of the welding position of the joint formed by the detachable connection of the left and right side plates, the upper and lower cover plates, and the front and rear side plates of the present invention, wherein eight deepened regions shown at the right side edge are the welding positions;

the flexible printed circuit board comprises, by weight, 1-an upper cover plate, 2-an FPC assembly plate, 3-a rear end cover assembly plate, 4-a rear cover assembly plate, 5-a right side plate, 6-a heat conduction structure adhesive, 7-an electric core group, 8-a lower cover plate, 9-a front cover assembly plate, 10-a front end cover assembly plate, 11-a left side plate, 12-a voltage acquisition sheet, 13-a temperature acquisition sheet, 14-a limiting structure, 15-a flexible printed circuit board, 16-an FPC support plate, 17-a copper bar, 18-a plate groove, 19-an insulation plate, 20-an end cover, 21-a thermal insulation plate, 22-a matching structure, 71-foam cotton, 72-an electric core lug, 73-an electric core and 74-an adhesive layer.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "front", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Example 1

The embodiment provides a soft package battery module, in particular to a detachable module, an explosion diagram of which is shown in fig. 1, wherein the soft package battery module comprises a battery cell group 7, a left side plate, a right side plate, an upper cover plate, a lower cover plate, a front side plate and a rear side plate, which are arranged on the outer side of the battery cell group 7;

the battery core group 7 (see fig. 2 for a structural schematic diagram) includes at least two battery cells, at least two battery cells 73 are in a group, foam 71 is arranged between each group of battery cells at intervals, an adhesive layer 74 is arranged between the battery cells inside each group of battery cells, and the adhesive layer 74 is made of pressure sensitive adhesive and/or conductive adhesive.

The left and right side board includes relative left side board 11 and the right side board 5 that sets up, upper and lower apron is including relative upper cover plate 1 and the lower apron 8 that sets up, the front and back curb plate includes: the front end cover assembly plate 10 (shown in a structural schematic view in fig. 6) and the rear end cover assembly plate 3 are oppositely arranged, and the front cover plate assembly plate 9 (shown in a structural schematic view in fig. 5) and the rear cover plate assembly plate 4 are oppositely arranged, and the front cover plate assembly plate 9 and the rear cover plate assembly plate 4 are respectively positioned on one sides, close to the electric core group, of the front end cover assembly plate 10 and the rear end cover assembly plate 3;

front end housing assembly panel 10 includes copper bar 17 and the board groove 18 that supports copper bar 17, on copper bar 17 was wired to the electric core group 7, formed complete circuit loop, board groove 18 sets up in front end housing assembly panel 10, plays the effect that supports copper bar 17, keeps apart copper bar 17 and electric core utmost point ear simultaneously, prevents both contacts.

The front cover plate assembly plate 9 consists of an end cover 20 and an insulating plate 19, and the insulating plate 19 physically isolates the copper bar 17 to prevent electric leakage and short circuit.

Rear end cover assembly plate 3 includes copper bar 17 and the board groove 18 that supports copper bar 17, on copper bar 17 was wired to the electric core group 7, formed complete circuit loop, board groove 18 sets up in front end cover assembly plate 10, plays the effect that supports copper bar 17, keeps apart copper bar 17 and electric core utmost point ear simultaneously, prevents both contacts.

The rear cover plate assembly plate 4 consists of an end cover 20 and an insulating plate 19, and the insulating plate 19 physically isolates the copper bar 17 to prevent electric leakage and short circuit.

Still be provided with FPC assembly panel 2 (the structure schematic diagram refers to figure 4) between upper cover plate 1 and the electric core group 7, FPC assembly panel 2 includes flexible line way board 15 and FPC backup pad 16, set up limit structure 14 in the FPC backup pad 16 for fixed flexible line way board 15, be provided with temperature acquisition piece 13 and voltage acquisition piece 12 on the flexible line way board 15, the temperature acquisition piece is used for gathering temperature information, the voltage acquisition piece is used for gathering voltage information.

And heat insulation plates 21 are arranged between the left side plate 11 and the right side plate 5 and between the electric core group 7 and are connected through heat conduction structural adhesive 6. A heat absorbing material layer is arranged on one side surface of the heat insulation plate 21, and the heat absorbing material is 10 wt% of talcum powder modified polylactic acid;

the left and right side plates are connected with the upper and lower cover plates in an interference fit manner through a clamping structure (see fig. 3 for a structural schematic diagram), so that the left and right side plates continuously bear the pressure of the upper and lower cover plates pointing to the battery cell, and the battery cell is tightly forced, wherein the pressure is 5-300 kPa;

the left side plate, the right side plate, the upper cover plate, the lower cover plate, the front side plate and the rear side plate are connected through clamping to package the battery cell, so that a soft package battery module is formed;

the electric core group 7 comprises foam, the left side plate and the right side plate are parallel to or in the same direction with the plane of the battery piece, and the front side plate and the rear side plate are perpendicular to the left side plate, the right side plate and the horizontal plane.

Example 2

The embodiment provides an assembling method of the pouch battery module described in embodiment 1, including the following steps:

(1) coating 10 wt% of talcum powder modified polylactic acid on the surface of a mica sheet, and drying to form a heat absorption layer on the mica sheet;

(2) respectively attaching the mica sheets with the heat absorption layers obtained in the step (1) to two sides of the electric core group 7 through a tool, wherein the heat absorption layers are close to the side of the electric core group 7 (the structural schematic diagram of the electric core group is shown in figure 2), and then attaching the left side plate 11 and the right side plate 5 to the side of the mica sheets to apply pretightening force for clamping;

(3) then, adhering an FPC (flexible printed circuit) assembling plate 2 between the upper cover plate 1 and the electric core group 7 under the condition of maintaining clamping, adhering heat insulation plates 21 between the left side plate 11 and the electric core group 7 and between the right side plate 5 and the electric core group 7 respectively, and clamping the upper cover plate 1, the lower cover plate 8, the left side plate 11 and the right side plate 5, wherein the clamping is realized by arranging a matching structure 22 on the corresponding edge of the plates (the clamping structure is schematically shown in figure 2);

(4) then the front cover plate assembly plate 9, the rear cover assembly plate 4, the front end cover transfer plate 10 and the rear end cover assembly plate 3 are clamped to form a complete soft package battery module;

(5) the front end cover assembly plate 10, the rear end cover assembly plate 3, the upper cover plate 1, the lower cover plate 8, the left side plate 11 and the right side plate 5 are welded (see fig. 7 for a schematic welding position) and sealed.

Example 3

This example differs from example 1 in that: the left and right side plates, the upper and lower cover plates for applying pressure to the left and right side plates, and the front and rear side plates are directly connected by welding.

The applicant states that the present invention is described in detail by the above embodiments, but the present invention is not limited to the above detailed method, i.e. the present invention is not meant to be implemented by relying on the above detailed method. It should be clear to those skilled in the art that any improvement of the present invention, to the equivalent replacement of each raw material of the present invention, the addition of auxiliary components, the selection of specific modes, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims (10)

1. The soft package battery module is characterized by comprising a battery cell group, a left side plate, a right side plate, an upper cover plate, a lower cover plate, a front side plate and a rear side plate, wherein the left side plate, the right side plate, the upper cover plate and the lower cover plate are arranged on the outer side of the battery cell group;

the left side plate and the right side plate are connected with the upper cover plate, the lower cover plate and/or the front side plate and the rear side plate, so that pre-tightening force applied to the battery cell by the left side plate and the right side plate before connection is converted into pressure pointing to the battery cell after connection, and the connection at least comprises welding;

at least one heat insulation plate is arranged between the left side plate and the right side plate and between the electric core group;

the left side plate, the right side plate, the upper cover plate, the lower cover plate, the front side plate and the rear side plate are connected to encapsulate the battery cell to form a soft package battery module;

the battery pack comprises foam, the left side plate and the right side plate are parallel to or in the same direction with the plane of the battery piece, and the front side plate and the rear side plate are perpendicular to the left side plate, the right side plate and the horizontal plane.

2. The laminate battery module as recited in claim 1, wherein a heat absorbing plate is further arranged on the side of the heat insulating plate close to the electric core, and the heat absorbing plate is a physical cooling plate or a chemical heat absorbing plate or a combination of the two;

the physical cooling plate comprises: a cooling plate provided with a circulating cooling liquid flow passage;

the chemical heat absorption plate comprises: an absorber plate comprising an endothermic material that undergoes an endothermic reaction when heated.

3. The laminate battery module according to claim 1, wherein the heat absorbing plate and the heat insulating plate are arranged in the following manner: and coating a heat absorption material which is heated to perform heat absorption reaction on the heat insulation plate, and drying to form the heat absorption plate on the surface of the heat insulation plate, wherein the heat insulation plate is made of a high temperature resistant material.

4. The soft package battery module according to claim 1, wherein pressure-sensitive adhesive and/or heat-conducting adhesive are/is arranged between the cells in the cell group, and the heat-conducting adhesive and the pressure-sensitive adhesive are mixed and used on the same cell plane.

5. The laminate polymer battery module of claim 1, wherein the left and right side plates are fixedly connected with the upper and lower cover plates or the front and rear side plates in a detachable connection manner, and then are welded, wherein the detachable connection manner comprises a buckle, a clamping or a bolt and/or a nut connection.

6. The laminate battery module as recited in claim 2, wherein the heat insulation plate is connected with the left side plate/the right side plate through a heat insulation glue, and the heat absorption plate is connected with the electric core group through a heat insulation glue.

7. The laminate battery module according to claim 1, wherein the front and rear side plates are in any one of two forms:

the front side plate and the rear side plate are front end cover assembling plates and rear end cover assembling plates which are arranged oppositely;

secondly, the front and rear side plates include: the battery pack comprises a front end cover assembling plate, a rear end cover assembling plate, a front cover plate assembling plate and a rear cover plate assembling plate, wherein the front end cover assembling plate and the rear end cover assembling plate are oppositely arranged, the front cover plate assembling plate and the rear cover plate assembling plate are oppositely arranged, and the front cover plate assembling plate and the rear cover plate assembling plate are respectively positioned on one side, close to the battery core, of the front end cover assembling plate and the rear end cover.

8. The laminate battery module of claim 7, wherein the front cover plate assembly plate comprises a copper bar and a plate groove for supporting the copper bar, the battery cell is connected to the copper bar to form a complete circuit loop, and the plate groove is arranged in the front cover plate assembly plate to support the copper bar and isolate the copper bar from a tab of the battery cell to prevent the copper bar and the tab from contacting with each other;

the front end cover assembly plate consists of a front end cover and an insulating plate, and the insulating plate physically isolates the copper bar to prevent electric leakage and short circuit;

the rear cover plate assembly plate comprises a copper bar and a plate groove for supporting the copper bar, the electric core is connected to the copper bar in a wiring mode to form a complete circuit loop, and the plate groove is arranged in the rear cover plate assembly plate and plays a role in supporting the copper bar, and meanwhile, the copper bar and an electric core lug are isolated to prevent the copper bar and the electric core lug from contacting;

the rear end cover assembly plate consists of an end cover and an insulating plate, and the insulating plate physically isolates the copper bar to prevent electric leakage and short circuit;

still be provided with the FPC pilot board between upper cover plate and the electric core group, the FPC pilot board includes flexible line way board and FPC backup pad, set up limit structure in the FPC backup pad for fixed flexible line way board, be provided with temperature acquisition piece and voltage acquisition piece on the flexible line way board.

9. The laminate polymer battery module of claim 1, wherein the left and right side plates, the upper and lower cover plates, the front end cover and the rear end cover are made of aluminum, the left and right side plates are made of stamping or extrusion molding, the upper and lower cover plates are made of stamping or bending molding, and the front end cover and the rear end cover are made of extrusion or casting molding.

10. The soft package battery module of claim 1, wherein the widths of the upper and lower cover plates are adjusted according to the pre-tightening requirements of the battery cell and the foam.

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