Background
Along with the continuous expansion of new energy automobile markets, automobile manufacturers have higher and higher requirements on power battery modules. The 3P4S module (3 parallel 4 series) is widely applied in the soft package power battery module, 3 electric cores are connected in parallel to form 1 small module, and 4 small modules are connected in series, so that three electric cores are required to be connected in parallel to form one small module, in the prior art, one small module usually needs to be formed by connecting a 2P middle frame and 1P middle frame in parallel, namely, two electric cores are respectively arranged on two sides of one 2P middle frame, one electric core is arranged on two sides of one 1P middle frame, and then the two electric cores are connected in parallel; or, 3 1P middle frames are needed, namely, three battery cells are respectively arranged in the three 1P middle frames and then are connected in parallel. Similarly, for other odd numbers of small modules connected in parallel, a plurality of 2P middle frames are generally adopted to install the battery core to form a plurality of 2 parallel small modules, one 1P middle frame is adopted to install the battery core to form 1 parallel small modules, and then the small modules are connected in parallel, or all the small modules adopt 1 parallel small modules, so that the assembly structure has the following defects:
firstly, the number of small modules is increased by adopting 1 small modules, the number of assembled parts is increased, the connection mode between the small modules is complex, the welding position of the busbar is increased, time and labor are wasted, the assembly efficiency is low, and the manufacturing cost is increased;
secondly, the 1-small module is adopted, so that the number of small modules is increased, and meanwhile, the structural strength of the whole module is greatly reduced.
Patent document with application number of 2016117 1142.X discloses a soft package battery core module assembly structure and an assembly method thereof, wherein the soft package battery core module assembly structure comprises a battery core protection frame, an aluminum protection shell and soft package battery cores, and further comprises an insulating piece, the thickness of the battery core protection frame is matched with the sum of the thicknesses of two soft package battery cores, the two soft package battery cores are closely attached to the battery core protection frame in a mode that homopolar electric lugs are similar, and homopolar electric lugs of the two soft package battery cores are fixedly connected with a pre-buried pole piece respectively. The soft package battery core module assembly structure is characterized in that soft package battery cores are installed through a plurality of battery core protection frames, and two battery cores installed on the battery core protection frames in the module can only be connected in parallel, so that the module is only applicable to the installation of even-numbered parallel battery core modules, otherwise, at least one battery core is only installed on one battery core protection frame, and the energy density of a battery is reduced.
Disclosure of Invention
The invention mainly aims to provide a power battery module middle frame, which aims to solve the problem that the existing soft package battery cell module structure is not suitable for small modules connected in parallel in odd number.
In order to achieve the above-mentioned object, the present invention provides a power battery module middle frame, comprising a frame main body, wherein the frame main body is provided with an opposite end a and an opposite end B, the end a is sequentially provided with a first end a welding base, an end a base partition board and a second end a welding base along the thickness direction of the frame main body, the end a base partition board protrudes outwards from the frame main body to form a whole, and the first end a welding base and the second end a welding base are insulated and spaced; the B end is provided with a B end welding base, and the B end welding base extends continuously in the thickness direction of the frame main body.
Preferably, the frame body is made of plastic, and the frame body is integrally formed with the first A-end welding base, the second A-end welding base and the B-end welding base through injection molding.
Preferably, the first A-end welding base, the second A-end welding base and the B-end welding base are made of aluminum or aluminum alloy materials.
Preferably, a heat conducting aluminum plate is arranged in the middle of the frame main body, and the frame main body and the heat conducting aluminum plate are integrally formed through injection molding.
Preferably, a first a-end combining hole and a second a-end combining hole are formed at the a-end of the frame body, the first a-end welding base is inserted into the first a-end combining hole, and the second a-end welding base is inserted into the second a-end combining hole; the B end of the frame body is provided with a B end combining hole, and the B end welding base is inserted into the B end combining hole.
The invention also provides a power battery module structure, which comprises: a power battery module middle frame according to any one of the above; when the power battery module structure comprises a plurality of small modules which are connected in series, and the small modules are connected in parallel by an odd number of soft package electric cores, at least one pair of adjacent small modules adopts a middle frame of the power battery module; the positive electrode of one of the two soft package electric cores arranged on the power battery module is connected with the first A-end welding base, and the negative electrode of the other of the two soft package electric cores is connected with the second A-end welding base.
Preferably, the power battery module structure further includes: the two opposite ends of the conventional middle frame are respectively provided with a conventional welding base; in the pair of adjacent small modules, the conventional welding bases of the conventional middle frame, which are close to one end of the B-end welding base, are electrically connected with the B-end welding base through a first bus bar, and the conventional welding bases of each small module, which are close to one end of the first A-end welding base or the second A-end welding base, are electrically connected with the corresponding first A-end welding base or second A-end welding base through a second bus bar.
Preferably, when the power battery module structure includes an even number of small modules connected in series with each other, the number of the frames in the power battery module is half the number of the small modules.
Preferably, when the small modules include only one soft package battery cell, each small module adopts the power battery module middle frame.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the first A-end welding base and the second A-end welding base are arranged at one end of the frame main body, insulation isolation is carried out through the A-end base partition plate made of insulation materials, the A-end base partition plate can ensure enough electric gaps and creepage distances, and the B-end welding base arranged at the other end is identical to the structure of the conventional welding base, so that when two soft package electric cores are respectively arranged on two sides of the middle frame of the power battery module, the positive electrode of one soft package electric core and the negative electrode of the other soft package electric core are connected to the B-end welding base, the series connection of the two soft package electric cores can be realized, namely, the 2P middle frame can be used for realizing the series connection of the two single soft package electric cores, the use of the 1P middle frame is reduced, the type and the number of the middle frame are reduced, the die sinking cost of the production middle frame is reduced, the number of other connecting parts such as a bus bar is also reduced, the welding position of the bus bar is reduced, the module structure is simplified, and the manufacturing cost is reduced. And because the number of parts is reduced, the structural strength between small modules in the module is increased, and the compatibility of the small modules to modules with different sizes is improved.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The invention provides a power battery module middle frame.
Referring to fig. 1 to 3, a power battery module middle frame 10 includes a frame body 11, wherein the frame body 11 has opposite ends a and B, the ends a are sequentially provided with a first end a welding base 12, an end a base partition 111, and a second end a welding base 13 along the thickness direction of the frame body, the end a base partition 111 protrudes out from the frame body 11 to form a whole, and the first end a welding base 12 and the second end a welding base 13 are insulated and spaced apart; the B-terminal is provided with a B-terminal welding base 14, and the B-terminal welding base 14 extends continuously in the thickness direction of the frame body 11.
Two conventional welding bases are arranged at two opposite ends of a conventional middle frame (2P middle frame) adopted by the common battery module along a frame plane, the two conventional welding bases have the same structure, when two soft package electric cores are respectively arranged on two sides of the conventional middle frame, positive pole lugs of the two soft package electric cores are connected to the conventional welding bases at one end, and negative pole lugs are connected to the other end, so that the parallel connection of the two soft package electric cores is realized. When more than two odd soft package battery cells are connected in parallel, at least one battery cell at the tail end along the stacking direction of the battery cells needs to be installed through a 1P middle frame, if a 2P middle frame is adopted, the energy density of the whole module can be reduced, a plurality of small modules connected in parallel need a plurality of 1P middle frames, and buses are further needed to be electrically connected in each small module, so that the number of assembled parts is increased.
In the power battery module middle frame in this embodiment, two welding bases of the first a-end welding base 12 and the second a-end welding base 13 are disposed at one end of the frame main body 11, and insulation is performed through the a-end base partition 111 made of insulation materials, the a-end base partition 111 can ensure enough electric gaps and creepage distances, and the B-end welding base 14 disposed at the other end is identical to the structure of the conventional welding base, so that when two soft package electric cores are respectively mounted on two sides of the power battery module middle frame, the positive electrode of one soft package electric core and the negative electrode of the other soft package electric core are connected to the B-end welding base 14, the series connection of the two soft package electric cores can be realized, namely, the 2P middle frame can be used for realizing the series connection of the two single soft package electric cores, so that the use of the 1P middle frame is reduced, the variety and number of the middle frame are reduced, the die opening cost of the production middle frame is reduced, the number of other connecting parts such as the bus bar is also reduced, the welding position of the bus bar is reduced, the assembly is simplified, the assembly efficiency is also improved, and the manufacturing cost is reduced. And because the number of parts is reduced, the structural strength between small modules in the module is increased, and the compatibility of the small modules to modules with different sizes is improved.
Further, the frame body 11 is made of plastic, and the frame body 11 is integrally formed with the first a-end welding base 12, the second a-end welding base 13, and the B-end welding base 14 by injection molding.
Further, the first a-end welding base 12, the second a-end welding base 13 and the B-end welding base 14 are made of aluminum or aluminum alloy.
Further, a heat conducting aluminum plate 15 is arranged in the middle of the frame body 1, and the frame body 11 and the heat conducting aluminum plate 15 are integrally formed through injection molding.
The first A-end welding base 12 and the second A-end welding base 13 are fixed at the A-end of the frame body 1 in an in-mold injection molding mode, the B-end welding base 4 is fixed at the B-end of the frame body 1 in an in-mold injection molding mode, and the heat conducting aluminum plate 5 is fixed at the inner side of the frame body 1 in an in-mold injection molding mode. Specifically, when the power battery module middle frame is manufactured, the first a-end welding base 12, the second a-end welding base 13, the B-end welding base 14 and the heat conducting aluminum plate 15 are disposed in a mold, and then manufactured by injection molding, and the a-end base partition 111 is also formed by one-step molding in the mold, so that the manufacturing process of the power battery module middle frame is simple.
Further, a first a-end coupling hole, into which the first a-end welding base 12 is inserted, and a second a-end coupling hole, into which the second a-end welding base 13 is inserted, are formed at the a-end of the frame body 11; the B end of the frame body 11 is formed with a B end coupling hole, and the B end welding base 14 is inserted into the B end coupling hole.
The conventional module middle frame is generally formed by injection molding, but it will be understood that in other embodiments, the first a-end welding base 12, the second a-end welding base 13, and the B-end welding base 14 may be fixedly connected to the frame main body 11 in other manners, so as to ensure good connection strength, and further ensure insulation and isolation between the first a-end welding base 12 and the second a-end welding base 13, which is not limited herein.
The invention also provides a power battery module structure, which comprises: the power battery module middle frame 10 of any one of the above; when the power battery module structure comprises a plurality of small modules which are connected in series, and the small modules are connected in parallel by an odd number of soft package battery cores 20, at least one pair of adjacent small modules adopts a power battery module middle frame 10; the positive electrode of one of the two soft package electric cores arranged on the power battery middle frame 10 is connected with the first A-end welding base, and the negative electrode of the other of the two soft package electric cores is connected with the second A-end welding base.
The specific structure of the power battery module middle frame refers to the embodiment, and the power battery module structure adopts all the technical schemes of all the embodiments, so that the power battery module middle frame has all the beneficial effects brought by the technical schemes of the embodiments. Specifically, referring to fig. 3, each soft-package battery cell 20 has a battery cell positive electrode 21 and a battery cell negative electrode 22 opposite to each other, in the assembly of the small module, the positive electrode of one soft-package battery cell 20 and the negative electrode of the other soft-package battery cell 20 are connected through the B-end welding base 14 of the middle frame of the small module, the tabs are respectively fixed at two sides of the B-end welding base 14 in a laser welding manner, and the tabs at the other ends of the two battery cells are respectively welded at the sides of the first a-end welding base 12 and the second a-end welding base 13 through laser welding.
Further, referring to fig. 4, the power battery module structure further includes: a conventional middle frame 30, wherein conventional welding bases 31 are arranged at two opposite ends of the conventional middle frame 30; in the pair of adjacent small modules, the conventional soldering bases 31 of the conventional middle frame 30 near one end of the B-terminal soldering base 14 are electrically connected with the B-terminal soldering base 14 through a first bus bar 41, and the conventional soldering bases 31 of each small module near one end of the first a-terminal soldering base 12 or the second a-terminal soldering base 13 are electrically connected with the corresponding first a-terminal soldering base 12 or second a-terminal soldering base 13 through a second bus bar 42.
Fig. 4 is a schematic diagram of a connection mode of a 3P4S module, mainly including six small modules, twelve electric cores 20, five buses with different specifications, including two first buses 41, two second buses 42 and one third bus 43, where small modules numbered (2) and (5) adopt the power battery module middle frame of the present invention, other small modules adopt a common conventional middle frame 30, two electric cores in the small module (1) are connected in parallel with one electric core in the small module (2), another electric core in the small module (2) is connected in parallel with two electric cores in the small module (3), three small modules form a 3P2S unit, and the small module (4), the small module (5) and the small module (6) are connected in the same manner and are connected in series with three other small modules to form a 3P4S module.
Further, when the power battery module structure includes an even number of small modules connected in series with each other, the number of the power battery module middle frames 10 is half of the number of the small modules.
Further, when the small modules include only one soft battery cell, each small module employs the power battery module middle frame 10.
Fig. 5 is a schematic diagram of a connection mode of a 1P12S module, which mainly includes six small modules, twelve electric cores 20, and five bus bars with the same specification, namely a fourth bus bar 44, each small module adopts the power battery module middle frame 10 of the present invention, two electric cores in the small modules are connected in series, and different small modules are connected in series at an end a of the power battery module middle frame 10 to form a 1P12S battery module.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.