CN218769815U - Cylindrical battery module - Google Patents

Abstract

The utility model provides a cylindrical battery module, which comprises a first fixing frame, a second fixing frame and a plurality of battery cell groups positioned between the first fixing frame and the second fixing frame; wherein, the electric core group includes connecting rod and a plurality of monomer electricity core, and monomer electricity core axis department is provided with the through-hole that supplies the connecting rod to pass, and a plurality of monomer electricity core are established in order on the connecting rod, and a plurality of monomer electricity core series connection each other, and the both ends of connecting rod are connected with first mount and second mount respectively. Monomer electricity core on this embodiment electricity core group passes through the connecting rod and establishes ties each other, improves monomer electricity core efficiency in groups greatly, and the space utilization of monomer electricity core in the battery module can improve, and then makes the energy density of cylinder battery module improve by a wide margin.

Description

Cylindrical battery module

Technical Field

The utility model relates to a battery technology field especially relates to a cylinder type battery module.

Background

At present, lithium ion batteries have the advantages of high specific energy, many recycling times, long storage time and the like, and are widely applied to portable electronic equipment such as mobile phones, digital cameras and portable computers, and also widely applied to large and medium-sized electric equipment such as electric automobiles, electric bicycles, electric tools and the like, so that the performance requirements on the lithium ion batteries are higher and higher. Among them, a battery module composed of a plurality of cylindrical lithium ion cores is widely used in the field of electric vehicles.

At the present stage, the cylinder battery module comprises a plurality of cylindrical monomer electric cores, upper framework and lower framework, and a plurality of monomer electric cores are arranged into electric core group and arranged in the middle of upper and lower framework, fix the monomer electric core through upper and lower framework and then constitute stable in structure's cylinder battery module.

Among the prior art, arrange at the horizontal direction array by the cylinder monomer electric core of a plurality of vertical settings usually and form single electric core group, from this, then cause the cylinder battery module can only improve energy density through increasing monomer electric core in the horizontal direction, nevertheless can't integrate more electric core groups in the direction of height to lead to the unable improvement of cylinder battery module energy density in the space. In order to be able to adapt to the use of high power of cylindrical battery modules on an electric vehicle, it is necessary to stack a plurality of cylindrical battery modules in the height direction in series, thereby increasing the energy by combining a plurality of cylindrical battery modules together. However, the space utilization rate of the battery module cannot be effectively improved by the cylindrical battery module integration method, so that the installation of the multi-battery module in the equipment in a narrow space is limited.

Chinese patent publication No. CN107681098A discloses a cylindrical power battery module, which is formed by connecting a plurality of battery modules in series, each battery module is formed by connecting a plurality of cylindrical battery monomers in parallel, and the battery modules adopt an assembled mortise-tenon structure, thereby improving the space utilization rate. Although the technical scheme disclosed in the patent integrates a plurality of battery modules together to a certain extent, the space utilization rate and the energy density of the battery module can be improved. However, each battery module is formed by connecting a plurality of cylindrical battery monomers in parallel, and each cylindrical battery monomer with small capacity is fixed by two opposite battery supports to form a battery module with large capacity. Meanwhile, the battery supports at the two ends of the battery module are also provided with a bus board and a power taking board, and the battery modules are connected in parallel. Such structure setting leads to connecting through more battery support, cylinder manifold and getting the electric board between a plurality of monomer electricity cores in whole battery module, and more spare part will occupy more spaces of battery module, and then leads to the battery module space utilization of this mode of assembling to reduce, the unable maximize of energy density.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a cylinder type battery module solves among the prior art the problem that cylinder battery module space utilization is low, and energy density can't improve by a wide margin.

The technical scheme of the utility model is realized like this:

the utility model provides a cylindrical battery module, which comprises a first fixing frame, a second fixing frame and a plurality of electric core groups positioned between the first fixing frame and the second fixing frame; wherein the content of the first and second substances,

the electric core group includes connecting rod and a plurality of monomer electricity core, monomer electricity core axis department is provided with the confession the through-hole that the connecting rod passed, it is a plurality of monomer electricity core is established in order the cover and is established on the connecting rod, and is a plurality of monomer electricity core series connection each other, the both ends of connecting rod respectively with first mount with the second mount is connected.

On the basis of the technical scheme, preferably, the plurality of electric core groups are horizontally arranged between the first fixing frame and the second fixing frame, and are arranged in an array manner in a space formed by the first fixing frame and the second fixing frame.

On the basis of the technical scheme, preferably, the positive pole post and the negative pole post that the position corresponds are provided with respectively at monomer electricity core length direction both ends, pass through between two adjacent monomer electricity cores on the electricity core group the positive pole post with the negative pole post electricity is connected, monomer electricity core length direction one end is provided with the location bellying, the other end be provided with location bellying complex location depressed part, pass through between two adjacent monomer electricity cores on the electricity core group the location bellying with the location depressed part is connected.

In one embodiment, the positioning protrusion is disposed on the positive electrode terminal surface, and the positioning recess is disposed on the negative electrode terminal surface.

Further, preferably, the number of the positive pole posts and the number of the negative pole posts are two, and the positive pole posts and the negative pole posts are symmetrically arranged relative to the through holes.

As an embodiment, the positioning protrusion and the positive pole are spaced in a radial direction of one end of the cell, and the positioning recess and the negative pole are spaced in a radial direction of the other end of the cell.

On the basis of the technical scheme, preferably, the axis of the connecting rod is provided with a liquid cooling channel which penetrates through the connecting rod, and the liquid cooling channel is used for introducing cooling liquid.

On the basis of the above technical scheme, preferably, the first fixing frame and the second fixing frame are both provided with first positioning holes for the positive pole column and the negative pole column to pass through, and the first fixing frame and/or the second fixing frame are/is provided with second positioning holes for the positioning protrusions to pass through.

On the basis of the technical scheme, preferably, the battery module further comprises a cover plate and a bottom plate, the cover plate is horizontally arranged at the topmost end of the electric core group, two ends of the cover plate are respectively fixedly connected with the first fixing frame and the second fixing frame, the bottom plate is horizontally arranged at the bottommost end of the electric core group, and two ends of the bottom plate are respectively fixedly connected with the first fixing frame and the second fixing frame.

Further, preferably, the battery module further comprises a plurality of fixing supports arranged on the battery core group, through holes for the single battery cells to pass through are formed in the fixing supports, the joints of the two adjacent single battery cells are located in the through holes, and the upper end and the lower end of each fixing support are respectively fixedly connected with the cover plate and the bottom plate.

The utility model discloses following beneficial effect has for prior art:

(1) The utility model discloses a cylinder type battery module, through setting up the through-hole in monomer electricity core axis department, utilize the connecting rod to pass the through-hole on a plurality of monomer electricity cores, make a plurality of monomer electricity cores establish ties each other on the connecting rod and connect, constitute the electric core group from this, a plurality of electric core group arrays are arranged between first mount and second mount, and make the both ends of connecting rod be connected with first mount and second mount respectively, establish ties each other between the monomer electricity core on the electric core group, need not extra adapting unit to form monomer electricity core group by cluster, improve monomer electricity core group efficiency greatly, the space utilization of monomer electricity core in the battery module can improve, and then make the energy density of cylinder battery module improve by a wide margin;

(2) The plurality of electric core groups are arranged in an array mode in the space formed by the first fixing frame and the second fixing frame, so that the space utilization rate of the electric core groups in the battery module is greatly improved, and the energy density and the capacity of the whole cylindrical battery module are improved;

(3) The positive pole column and the negative pole column are respectively arranged at two ends of each monomer battery cell, and the positioning protruding part and the positioning concave part which are matched with each other are respectively arranged at two ends of each monomer battery cell, a plurality of monomer battery cells are sequentially sleeved on the connecting rod, two adjacent monomer battery cells can be connected in series through the positive pole column and the negative pole column, and meanwhile, the positioning protruding part and the positioning concave part between two adjacent monomer battery cells are matched and connected, so that the plurality of monomer battery cells can be prevented from rotating relatively, the plurality of monomer battery cells on the connecting rod can be integrated, the plurality of battery cells on the battery cell group can be ensured to be connected in series with each other, and the stable structure of the monomer battery cells on the battery cell group can be realized;

(4) The liquid cooling channel is arranged at the axis of the connecting rod, and cooling liquid can be introduced into the liquid cooling channel, so that the middle parts of the single battery cells can be cooled and radiated, and thermal runaway caused by overhigh temperature of the middle parts of the cylindrical single battery cells is avoided;

(5) The first fixing frame and the second fixing frame are matched with each other, so that the positions of a plurality of single battery cores in the axial direction of the connecting rod can be limited, meanwhile, the terminal posts on the single battery cores at the end parts of the battery core group can be matched with the first positioning hole and the positioning bosses are matched with the second positioning hole by arranging the first positioning hole and the second positioning hole, and therefore the phenomenon that the whole body formed by the plurality of single battery cores on the connecting rod rotates radially relative to the connecting rod is avoided, and the structural stability of the battery core group in the battery module is improved;

(6) Through the arrangement of the cover plate and the bottom plate, the clamping and fixing strength of the first fixing frame and the second fixing frame to the electric core group can be improved, and the structural strength of the whole battery module is improved;

(7) Through set up the fixed bolster on the electric core group, set up the through hole that supplies monomer electricity core to pass on the fixed bolster, two adjacent monomer electricity core junctions are located the through hole, the upper and lower both ends of fixed bolster respectively with apron and bottom plate fixed connection, set up from this, can support the electric core group through the fixed bolster, avoid the electric core group in connecting rod atress warp, cause the disconnect-between monomer electricity core, improve the reliability and the stability of battery module.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a cylindrical battery module according to the present invention;

fig. 2 is a structural embodiment of a single cell disclosed in the present invention;

fig. 3 is another structural embodiment of a single cell disclosed in the present invention;

fig. 4 is a schematic perspective view of the electric core assembly disclosed in the present invention;

fig. 5 is an exploded view of a cylindrical battery module according to the present invention;

fig. 6 is a schematic perspective view of a first fixing frame and a second fixing frame of the present invention;

fig. 7 is a schematic plan view of a cylindrical battery module according to the present invention;

FIG. 8 is an enlarged view of a portion A of FIG. 7;

reference numerals:

1. a first fixing frame; 2. a second fixing frame; 3. the electric core group; 31. a single cell; 32. a connecting rod; 310. a through hole; 311. a positive post; 312. a negative pole post; 313. a positioning recess; 314. a positioning boss; 321. a liquid cooling channel; s1, a first positioning hole; s2, second positioning holes; 4. a cover plate; 5. a base plate; 6. fixing a bracket; 61. a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1, in combination with fig. 2-4, the embodiment of the present invention discloses a cylindrical battery module, which includes a first fixing frame 1, a second fixing frame 2, and a plurality of battery cell sets 3 disposed between the first fixing frame 1 and the second fixing frame 2.

In the present embodiment, the battery cell group 3 includes a connecting rod 32 and a plurality of single battery cells 31, and through holes 310 for the connecting rod 32 to pass through are provided at the axes of the single battery cells 31. In order to facilitate the manufacturing of the single battery cells 31, the through holes 310 in the single battery cells 31 are preferably circular holes, and the connecting rods 32 are cylindrical structures. The plurality of monomer battery cores 31 are sequentially sleeved on the connecting rod 32, and the connecting rod 32 and the through hole 310 are in clearance fit. A plurality of monomer batteries 31 are connected in series with each other, and the both ends of connecting rod 32 are connected with first mount 1 and second mount 2 respectively.

Adopt above-mentioned technical scheme, utilize connecting rod 32 to pass through-hole 310 on a plurality of monomer electricity cores 31, make a plurality of monomer electricity cores 31 series connection each other on connecting rod 32, constitute electricity core group 3 from this, a plurality of electricity core group 3 arrays are arranged between first mount 1 and second mount 2, and make the both ends of connecting rod 32 be connected with first mount 1 and second mount 2 respectively, it is fixed to the tight of a plurality of electricity core group 3 clamp to realize first mount 1 and second mount 2, form the battery module of stable in structure. Establish ties each other between the monomer electric core 31 on the electric core group 3 in this embodiment, need not extra adapting unit and form a cluster monomer electric core 31 in groups, improve monomer electric core 31 efficiency in groups greatly, the space utilization of monomer electric core 31 in the battery module can improve, and then makes the energy density of cylinder battery module improve by a wide margin.

In order to improve the space utilization and the energy density of the battery module, the embodiment adopts the following modes: the plurality of electric core groups 3 are horizontally arranged between the first fixing frame 1 and the second fixing frame 2, and the plurality of electric core groups 3 are arranged in an array mode in the space formed by the first fixing frame 1 and the second fixing frame 2. From this setting, a plurality of electric core groups 3 are arranged with vertical direction array in above-mentioned space to improve monomer electricity core 31 space utilization in battery module greatly, and then improve battery module's energy density.

In order to realize the electrical connection when the plurality of monomer battery cells 31 on the connecting rod 32 are connected in series, in this embodiment, the positive electrode post 311 and the negative electrode post 312 corresponding to the positions are respectively disposed at two ends of the monomer battery cells 31 in the length direction, and two adjacent monomer battery cells 31 on the battery cell group 3 are electrically connected through the positive electrode post 311 and the negative electrode post 312. In this embodiment, the plurality of cell cores 31 are connected in the head, and under the clamping of the first fixing frame 1 and the second fixing frame 2, the plurality of cell cores 31 are connected in series in the axial direction of the connecting rod 32, and are connected in a butting manner through the positive pole column 311 and the negative pole column 312, so that the series connection between the cell cores 31 is realized.

In order to ensure that the poles between two adjacent single battery cells 31 are not dislocated after being connected, referring to fig. 7 and 8, in this embodiment, a positioning protrusion 314 is disposed at one end of each single battery cell 31 in the length direction, a positioning recess 313 matched with the positioning protrusion 314 is disposed at the other end of each single battery cell 31, and two adjacent single battery cells 31 on the battery cell group 3 are connected through the positioning protrusion 314 and the positioning recess 313. From this setting, can avoid a plurality of monomer electricity core 31 to rotate relatively to realize that a plurality of monomer electricity core 31 group 3 on the connecting rod 32 become whole, guarantee to establish ties each other between a plurality of electric cores on the electricity core group 3, realize the monomer electricity core 31 stable in structure on the electricity core group 3.

As some examples, referring to fig. 2, the positioning protrusion 314 of the present embodiment is provided on the end face of the positive post 311, and the positioning recess 313 is provided on the end face of the negative post 312. From this setting, through positive post 311 and negative pole post 312 mutual butt joint between two adjacent monomer batteries 31 to make the location bellying 314 on the positive post 311 and the cooperation of the location depressed part 313 on the negative pole post 312, simultaneously because monomer battery 31 overlaps through its central through-hole 310 cover that sets up and establishes on connecting rod 32, thereby make interconnect between two adjacent monomer batteries 31 constitute wholly, avoid taking place relative rotation.

On the basis of the above technical scheme, in order to ensure stable connection between two adjacent monomer battery cells 31, two positive posts 311 and two negative posts 312 are provided, and the two positive posts 311 and the two negative posts 312 are symmetrically arranged with respect to the through hole 310. From this setting, connect through two positive posts 311 and two negative poles 312, on the one hand, guarantee that positive post 311 and negative pole 312 area of contact are bigger, avoid two adjacent monomer electricity core 31 junctions contact failure, lead to opening circuit, on the other hand, all set up location bellying 314 on two positive posts 311, all set up location depressed part 313 on two negative poles 312, when making positive post 311 and negative pole 312 connect, two location bellying 314 and two location depressed parts 313 cooperate one by one to be connected, thereby it is more stable to make to connect between two adjacent monomer electricity cores 31, improve electric core group 3's structural stability and reliability.

As another example, referring to fig. 3, the positioning convex portion 314 and the positive pole 311 are spaced apart from each other in the radial direction of one end of the cell 31, and the positioning concave portion 313 and the negative pole 312 are spaced apart from each other in the radial direction of the other end of the cell 31. With the arrangement, the positive pole 311 and the positioning convex part 314 are separated from each other, the negative pole 312 and the positioning concave part 313 are separated from each other, and are symmetrical relative to the through hole 310, and the above components are respectively connected, so that the positive pole 311 and the negative pole 312 on the single electric cores 31 at the head and tail ends of the electric core group 3 can be conveniently connected with the busbar subsequently.

In the present embodiment, the cross-sectional shape of the positioning boss 314 may be circular, square, triangular, or the like. The positioning concave part 313 and the positioning convex part 314 are matched.

In some preferred embodiments, a liquid cooling channel 321 is disposed through the connecting rod 32 at the axis of the connecting rod 32, and the liquid cooling channel 321 is used for introducing cooling liquid. From this setting, set up liquid cooling passageway 321 through connecting rod 32 axis department, can let in the coolant liquid in the liquid cooling passageway 321 to the realization is cooled off the heat dissipation to monomer electric core 31 middle part, avoids cylinder monomer electric core 31 middle part high temperature to cause thermal runaway.

Because the two ends of the connecting rod 32 are respectively and fixedly connected with the first fixing frame 1 and the second fixing frame 2, in order to avoid the whole body formed by the plurality of monomer battery cells 31 on the connecting rod 32 rotating relative to the connecting rod 32, the first positioning holes S1 for the positive pole posts 311 and the negative pole posts 312 to pass through are respectively arranged on the first fixing frame 1 and the second fixing frame 2 in the embodiment. The first fixing frame 1 and/or the second fixing frame 2 are/is provided with a second positioning hole S2 for the positioning protrusion 314 to pass through. From this setting, avoid the whole that 3 groups of a plurality of monomer batteries 31 on the connecting rod 32 become to take place radial rotation for connecting rod 32, improve the structural stability of electric core group 3 in the battery module, on the other hand, can also make things convenient for anodal post 311, negative pole post 312 to pass first locating hole S1, make things convenient for anodal post 311 and negative pole post 312 on the monomer batteries 31 at follow-up busbar and electric core group 3 both ends to weld, thereby realize that all monomer batteries 31 establish ties or parallelly connected in the battery module.

In this embodiment, since the plurality of single electric cores 31 on one electric core set 3 belong to serial connection, if the plurality of electric core sets 3 need to be connected in series, the direction of the electric core set 3 needs to be changed, and therefore, the second positioning hole S2 needs to be arranged on the first fixing frame 1 and/or the second fixing frame 2 for the positioning protrusion 314 to pass through.

In order to improve the fixed intensity of first mount 1 and the centre gripping of second mount 2 to electric core group 3, it is shown with reference to fig. 5 and 6, the battery module of this embodiment still includes apron 4 and bottom plate 5, and apron 4 level is located a plurality of 3 topmost ends of electric core group, the both ends of apron 4 respectively with first mount 1 and 2 fixed connection of second mount, 5 levels of bottom plate set up a plurality of 3 bottommost ends of electric core group, the both ends of bottom plate 5 respectively with first mount 1 and 2 fixed connection of second mount. From this setting, apron 4 and bottom plate 5 carry out the horizontal stretch to first mount 1 and second mount 2 to improve the centre gripping fixed strength of first mount 1 and second mount 2 to electric core group 3, and then improve the structural strength of whole battery module.

Because a plurality of electric core groups 3 are arranged in the space direction array, a plurality of monomer electricity cores 31 establish ties on connecting rod 32, the both ends of connecting rod 32 are by first mount 1 and the 2 tractive of second mount, because the weight that monomer electricity core 31 loaded on connecting rod 32 is great, cause connecting rod 32 compressive deformation easily, and then make and break away from the connection between the monomer electricity core 31 on the connecting rod 32, for this reason, this embodiment is through setting up fixed bolster 6 on electric core group 3, set up the through hole 61 that supplies monomer electricity core 31 to pass on the fixed bolster 6, two adjacent monomer electricity core 31 junctions are located through hole 61, the upper and lower both ends of fixed bolster 6 respectively with apron 4 and bottom plate 5 fixed connection, set up from this, can support electric core group 3 through fixed bolster 6, avoid electric core group 3 in connecting rod 32 atress warp, cause the disconnection between the monomer electricity core 31, improve the reliability and the stability of battery module.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A cylinder type battery module, its characterized in that: the battery module comprises a first fixing frame (1), a second fixing frame (2) and a plurality of electric core groups (3) positioned between the first fixing frame (1) and the second fixing frame (2); wherein the content of the first and second substances,

the electric core group (3) includes connecting rod (32) and a plurality of monomer electricity core (31), monomer electricity core (31) axis department is provided with the confession through-hole (310) that connecting rod (32) passed, and is a plurality of monomer electricity core (31) are established in order the cover and are established on connecting rod (32), and are a plurality of series connection between monomer electricity core (31) each other, the both ends of connecting rod (32) respectively with first mount (1) with second mount (2) are connected.

2. The cylindrical battery module as set forth in claim 1, wherein: the plurality of electric core groups (3) are horizontally arranged between the first fixing frame (1) and the second fixing frame (2), and the plurality of electric core groups (3) are arranged in an array mode in a space formed by the first fixing frame (1) and the second fixing frame (2).

3. The cylindrical battery module as set forth in claim 1, wherein: the utility model discloses a battery pack, including monomer electricity core group (3), positive post (311) and negative pole post (312) that the position corresponds are provided with respectively at monomer electricity core (31) length direction both ends, pass through between two adjacent monomer electricity cores (31) on the electricity core group (3) between positive post (311) with negative pole post (312) electricity is connected, monomer electricity core (31) length direction one end is provided with location bellying (314), the other end be provided with location bellying (314) matched with location depressed part (313), pass through on the electricity core group (3) between two adjacent monomer electricity cores (31) location bellying (314) with location depressed part (313) are connected.

4. The cylindrical battery module as set forth in claim 3, wherein: the positioning convex part (314) is arranged on the end face of the positive pole (311), and the positioning concave part (313) is arranged on the end face of the negative pole (312).

5. The cylindrical battery module as set forth in claim 4, wherein: the number of the positive posts (311) and the number of the negative posts (312) are two, and the positive posts (311) and the negative posts (312) are symmetrically arranged relative to the through holes (310).

6. The cylindrical battery module as set forth in claim 3, wherein: the positioning convex part (314) and the positive pole column (311) are arranged at intervals in the radial direction of one end of the single battery cell (31), and the positioning concave part (313) and the negative pole column (312) are arranged at intervals in the radial direction of the other end of the single battery cell (31).

7. The cylindrical battery module as set forth in claim 1, wherein: the axis of the connecting rod (32) is provided with a liquid cooling channel (321) which penetrates through the connecting rod (32), and the liquid cooling channel (321) is used for introducing cooling liquid.

8. The cylindrical battery module as set forth in claim 3, wherein: the first fixing frame (1) and the second fixing frame (2) are respectively provided with a first positioning hole (S1) for the positive pole column (311) and the negative pole column (312) to pass through, and the first fixing frame (1) and/or the second fixing frame (2) are/is provided with a second positioning hole (S2) for the positioning boss (314) to pass through.

9. The cylindrical battery module as set forth in claim 1, wherein: the battery module is still including apron (4) and bottom plate (5), apron (4) level is located a plurality ofly the most top of electric core group (3), the both ends of apron (4) respectively with first mount (1) and second mount (2) fixed connection, bottom plate (5) level sets up a plurality of the most bottom of electric core group (3), the both ends of bottom plate (5) respectively with first mount (1) and second mount (2) fixed connection.

10. The cylindrical battery module as set forth in claim 9, wherein: the battery module further comprises a plurality of fixing supports (6) arranged on the battery core group (3), through holes (61) for the monomer battery cores (31) to pass through are formed in the fixing supports (6), the adjacent two through holes are formed in the joints of the monomer battery cores (31) and are located in the through holes (61), and the upper end and the lower end of each fixing support (6) are respectively fixedly connected with the cover plate (4) and the bottom plate (5).

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