CN209217068U - Battery modules and battery pack - Google Patents
Battery modules and battery pack Download PDFInfo
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- CN209217068U CN209217068U CN201822273635.5U CN201822273635U CN209217068U CN 209217068 U CN209217068 U CN 209217068U CN 201822273635 U CN201822273635 U CN 201822273635U CN 209217068 U CN209217068 U CN 209217068U
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- battery modules
- leptoprosopy
- secondary cell
- electrode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model relates to a kind of battery modules and battery packs.Battery modules include: more than two secondary cells, more than two secondary cells are arranged side by side along first direction, secondary cell includes shell, electrode assembly and closure, shell includes the receiving hole with opening, receiving hole extends in a second direction, first direction and second direction intersection, closure is hermetically connected with the shell with lid make and break mouth, electrode assembly is set in receiving hole and including more than two electrode units, electrode unit includes the first pole piece, the second pole piece and diaphragm, and more than two electrode units are stacked in a second direction.The battery modules of the utility model embodiment are smaller from the swell increment in secondary cell orientation, can effectively promote use process safety.
Description
Technical field
The utility model relates to battery technology fields, more particularly to a kind of battery modules and battery pack.
Background technique
With the development of technology, secondary cell will be used wider and wider, and is related to producing or live.Secondary cell is also referred to as dynamic
Power battery is rechargeable battery.Secondary cell is widely used.The secondary cell of low capacity can be used for small-sized electric car
, the secondary cell of high capacity can be used for Large Electric vehicle, such as hybrid vehicle or electric car.Secondary cell is in groups
In use, needing each secondary cell serial or parallel connection using busbar connector.Usually busbar connector and secondary cell is positive and negative
Pole is welded to connect.Battery modules include multiple secondary cells and the connector for fixing multiple secondary cells.
Secondary cell mainly includes shell, electrode assembly and cap assembly.Wherein, electrode assembly be by anode pole piece,
Cathode pole piece and isolation film winding stack.In charge and discharge process, the electrode assembly itself that secondary cell includes can be sent out
Raw expansion, so that very big expansive force can be discharged to external.
Multiple secondary cells as included by battery modules are arranged side by side along a direction, and the expansion of electrode assembly release
Power, therefore can shape after the expansive force superposition of the release of electrode assembly included by multiple secondary cells along the arragement direction of secondary cell
At biggish resultant force, so that the electrical property for not only resulting in secondary cell deteriorates, and connector structure with higher is required
Intensity constrains counteracting expansive force, this just needs the volume by increasing connector to be achieved, and thereby reduces secondary cell
Energy density and space utilization rate.
Utility model content
The utility model embodiment provides a kind of battery modules and battery pack.Battery modules are arranged from secondary cell
Swell increment on direction is smaller, can effectively promote use process safety.
On the one hand, the utility model embodiment proposes a kind of battery modules, comprising:
More than two secondary cells, more than two secondary cells are arranged side by side along first direction, and secondary cell includes
Shell, electrode assembly and closure, shell include the receiving hole with opening, and receiving hole extends in a second direction, first party
Intersect to second direction, closure is hermetically connected with the shell with lid make and break mouth, and electrode assembly is set in receiving hole and wraps
More than two electrode units are included, electrode unit includes the first pole piece, the second pole piece and diaphragm, more than two electrode unit edges
Second direction is stacked.
According to the one aspect of the utility model embodiment, electrode unit includes wide face and leptoprosopy, wide face and closure phase
To setting, leptoprosopy is located at wide face along the side of first direction, and the area in wide face is greater than the area of leptoprosopy.
According to the one aspect of the utility model embodiment, the ratio of the area in the area of leptoprosopy and wide face is 1/10~1/
2。
According to the one aspect of the utility model embodiment, the first pole piece, the second pole piece and membrane winding form electrode list
Member, electrode unit are flat structure, and including two wide faces and two leptoprosopy, two leptoprosopy are connected to wide face along first direction
Opposite two sides.
Have according to the one aspect of the utility model embodiment, between the first pole piece of two adjacent rings corresponding with leptoprosopy position
The first gap, the size in the first gap is 5um to 50um.
Have according to the one aspect of the utility model embodiment, between the first pole piece of two adjacent rings corresponding with leptoprosopy position
The first gap and the second gap corresponding with wide face position, the size in the first gap is greater than the size in the second gap.
According to the one aspect of the utility model embodiment, the material of shell is metal material, shell include the first side wall,
The area of second sidewall and the bottom wall being connected with the first side wall and second sidewall, the first side wall is greater than second sidewall, bottom wall
Area, the first side wall of two neighboring secondary cell is oppositely arranged, leptoprosopy setting corresponding with the first side wall.
According to the one aspect of the utility model embodiment, there is third space, between third between leptoprosopy and the first side wall
The size of gap is 0.3mm to 0.9mm.
According to the one aspect of the utility model embodiment, the thickness of the first side wall and second sidewall is respectively less than the thickness of bottom wall
Degree.
According to the one aspect of the utility model embodiment, closure includes lamina tecti and electrode terminal, lamina tecti and electricity
Extreme son is respectively positioned on the side of electrode assembly in a second direction, and lamina tecti is connected to shell, and electrode terminal is set to lamina tecti simultaneously
And it is electrically connected with electrode assembly.
According to the one aspect of the utility model embodiment, battery modules further include first end plate and the second end plate, and first
End plate and the second end plate are arranged along first direction interval, more than two secondary cells be set to first end plate and the second end plate it
Between, the Young's modulus of first end plate and the second end plate is less than 30Gpa.
Battery modules according to the utility model embodiment include it is more than two along first direction be arranged side by side it is secondary
Battery.Electrode unit included by each secondary cell is stacked along the second direction of the receiving hole of shell.The present embodiment
When electrode unit expands, mainly along the second direction dilatancy of receiving hole, and swell increment in a first direction is smaller.
In this way, the expansion resultant force that each secondary cell is accumulated in a first direction is smaller.In a first direction, battery modules do not need to make
It is constrained with the structural member with higher-strength and offsets expansive force or counteracting expansion can be constrained using more low intensive structural member
Power, so that battery modules self structure is more compact, effectively promotes battery mould so that the total quality of battery modules be effectively reduced
The energy density of group.Meanwhile swell increment is smaller in a first direction for battery modules itself, can effectively promote use process safety
Property.
On the other hand, a kind of battery pack is provided according to the utility model embodiment, comprising: cabinet has accommodating chamber；
Such as the battery modules of above-described embodiment, battery modules are housed inside accommodating chamber.
According to the other side of the utility model embodiment, in a second direction, the height of cabinet is secondary greater than one times
The height of the height of battery and the secondary cell less than twice.
According to the other side of the utility model embodiment, battery pack includes 2 of the width direction arrangement along cabinet
To 6 battery modules, each battery modules include 20 to 32 secondary cells.
According to the other side of the utility model embodiment, the thickness of secondary cell is more than or equal to 50mm, secondary cell
Height be more than or equal to 80mm.
Detailed description of the invention
The feature, advantage and technical effect of the utility model exemplary embodiment are described below by reference to attached drawing.
Fig. 1 is the structural schematic diagram of the battery modules of an embodiment of the present invention；
Fig. 2 is the decomposition texture schematic diagram of the secondary cell of an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the electrode unit of an embodiment of the present invention；
Fig. 4 is the schematic cross-sectional view of the secondary cell of an embodiment of the present invention；
Fig. 5 is enlarged drawing at A in Fig. 4；
Fig. 6 is the decomposition texture schematic diagram of the battery pack of an embodiment of the present invention；
Fig. 7 is the overall structure diagram of the battery pack of an embodiment of the present invention.
In the accompanying drawings, the attached drawing is not drawn according to the actual ratio.
Description of symbols:
10, battery modules；
11, secondary cell；
12, shell；12a, receiving hole；121, the first side wall；122, second sidewall；123, bottom wall；
13, electrode assembly；
14, electrode unit；14a, wide face；14b, leptoprosopy；141, the first pole piece；142, the second pole piece；143, diaphragm；
15, cap assembly；151, lamina tecti；152, electrode terminal；
16, the first gap；
17, the second gap；
18, third space；
19, first end plate；
20, the second end plate；
30, battery pack；
31, cabinet；31a, accommodating chamber；311, upper cover；312, bottom case；
X, first direction；Y, second direction.
Specific embodiment
The embodiments of the present invention is described in further detail with reference to the accompanying drawings and examples.Following embodiment
The detailed description and the accompanying drawings for illustratively illustrating the principles of the present invention, but cannot be used to limit the model of the utility model
It encloses, i.e., the utility model is not limited to described embodiment.
In the description of the present invention, it should be noted that unless otherwise indicated, the meaning of " plurality " is two or two
More than a；The orientation or positional relationship of the instructions such as term " on ", "lower", "left", "right", "inner", "outside" is merely for convenience of retouching
State the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore should not be understood as limiting the present invention.In addition, term " first ", " second "
Etc. being used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be directly connected, it can also be indirectly connected through an intermediary.For the ordinary skill in the art,
Visual concrete condition understands the concrete meaning of above-mentioned term in the present invention.
The utility model in order to better understand, below with reference to Fig. 1 to Fig. 7 to the battery modules of the utility model embodiment
10 are described in detail.
Shown in Figure 1, the utility model embodiment also provides a kind of battery modules 10 comprising: more than two
The secondary cell 11 of embodiment and busbar connector for connecting two secondary cells 11.More than two secondary cells 11 are along
One direction X is arranged side by side, wherein first direction X is the arragement direction of more than two secondary cells 11.One end of busbar connector with
A secondary cell 11 in two secondary cells 11 is connected and fixed, and the other end is connected and fixed with another secondary cell 11.?
In one example, the secondary cell 11 of the present embodiment can be hard shell battery or soft-package battery.
Shown in Figure 2, the secondary cell 11 of the utility model embodiment includes shell 12, the electricity being set in shell 12
Pole component 13 and the closure being tightly connected with shell 12.
The shell 12 of the present embodiment can be four prisms cylinder shape or other shapes.Shell 12 has accommodate electrod component 13
With the inner space of electrolyte.Shell 12 can be manufactured by such as aluminium, aluminium alloy or plastic or other material.
Shown in Figure 3, the electrode assembly 13 of the present embodiment includes more than two electrode units 14.The electricity of the present embodiment
Pole unit 14 can form main body and the first pole piece 141, the second pole piece 142 and diaphragm 143 are stacked or wound together
Portion and the tab being connected with main part.Diaphragm 143 is the insulator between the first pole piece 141 and the second pole piece 142.
The electrode unit 14 of the present embodiment is formed by diaphragm 143, the first pole piece 141 and the second pole piece 142 winding, and electrode unit 14
For the flat structure of multi-turn.It in the present embodiment, with the first pole piece 141 is illustratively positive plate, the second pole piece 142 is negative
Pole piece is illustrated.Similarly, in other examples, the first pole piece 141 can also be negative electrode tab, and the second pole piece 142
For positive plate.In addition, positive active material is applied on the coating area of positive plate, and negative electrode active material is applied to cathode
On the coating area of piece.The multiple uncoated areas extended from main part are then used as tab, and electrode unit 14 includes two tabs, i.e.,
Anode ear and negative electrode lug, anode ear are formed by the multiple uncoated region layer extended from the coating area of positive plate are folded；Negative electrode lug by
The multiple uncoated region layer extended from the coating area of negative electrode tab are folded to be formed.The electrolyte of process is manufactured in secondary cell 11
It infiltrating in process or later period use process, active material layer included by the electrode unit 14 of the present embodiment can expand,
It is expanded so as to cause electrode unit 14 is whole.Optionally, the capacity of the electrode unit of the present embodiment is 50Ah to 300Ah.
The closure of the present embodiment can be by the aluminum plastic film of the formation such as aluminium alloy, plastics and nylon, be also possible to by
The cap assembly 15 that the materials such as metal are formed, the closure of the present embodiment are cap assembly 15, wherein cap assembly 15 includes top
Cover board 151 and electrode terminal 152.Lamina tecti 151 and electrode terminal 152 are respectively positioned on the side of the Y in a second direction of electrode assembly 13.
Cap assembly 15 is sealedly attached to shell 12 by lamina tecti 151.Electrode terminal 152 is set to lamina tecti 151 and and electrode
Component 13 is electrically connected.
The battery modules 10 of the present embodiment include more than two secondary cells 11.More than two secondary cells 11 are along
One direction X is arranged side by side.Secondary cell 11 includes the electricity for having the shell 12 of receiving hole 12a and being set in receiving hole 12a
Pole component 13, wherein receiving hole 12a has opening and extends along second direction Y, i.e. second direction Y and receiving hole 12a's prolongs
It is parallel to stretch direction.Electrode assembly 13 includes more than two electrode units 14.More than two electrode units 14 Y in a second direction
It is stacked, wherein second direction Y is parallel with the stacking direction of more than two electrode units 14.The second direction of the present embodiment
Y is mutually perpendicular to first direction X, and the opening and closure of second direction Y and receiving hole 12a are also mutually perpendicular to.It is easy reason
The second direction Y of Xie Di, the present embodiment can also intersect with first direction X and approach vertical, the second direction Y of the present embodiment
It can intersect with the opening of receiving hole 12a and closure and approach vertical.When the electrode unit 14 of the present embodiment expands, electricity
Second expansive force of Y with the first expansive force along first direction X and in a second direction of pole component 13, due to multiple electrodes unit
14 stackings, therefore the first expansive force is less than the second expansive force.Therefore, electrode assembly 13 mainly expands on second direction Y, from
And make the expansive force of electrode assembly 13 mainly Y in a second direction, and in a first direction on X, the first expansive force is smaller, therefore to shell
12 influence is smaller.When more than two secondary cells 11 of the present embodiment are arranged side by side along first direction X, due to each secondary
Battery 11 when expanding generated second expansive force intersect with first direction X, i.e., when each secondary cell 11 expands
The direction of generated second expansive force Y in a second direction, therefore the second expansive force that generates of each secondary cell 11 will not be
It is accumulated on first direction X and forms biggish resultant force.In this way, fixed on using external fixator in a first direction X includes two
It is lower to the stiffness and strength requirement of fixing piece itself when the battery modules 10 of the secondary cell 11 of a above the present embodiment,
To favorably reduce the volume or weight of fixing piece, and then be conducive to improve the energy of 10 entirety of secondary cell 11 and battery modules
Density and space utilization rate；Furthermore be conducive to improve the cycle performance of secondary cell.
Electrode unit 14 in the present embodiment includes width face 14a and leptoprosopy 14b, wherein wide face 14a is opposite with closure to be set
Set, here, the surface of wide face 14a and closure towards width face 14a be oppositely arranged be not it is proper completely relatively,
It is oppositely arranged including the two part or towards the surface of width face 14a is in smooth with closure when width face 14a is domed because of expansion
Situation is oppositely arranged when face.Leptoprosopy 14b is located at width face 14a along the side of first direction X, and here, wide face 14a is along first direction
X has opposite two sides, and a leptoprosopy 14b is connected to the side of wide face 14a.The area of wide face 14a is greater than the face of leptoprosopy 14b
Product.Since the area of wide face 14a is greater than the area of leptoprosopy 14b, this time width face 14a is larger compared to the expansive force that leptoprosopy 14b is generated,
To further reduce the expansive force of the X in a first direction of secondary cell 11.Preferably, the area of leptoprosopy 14b is with width face 14a's
The ratio of area is 1/10~1/2, and when the ratio of the two is greater than 1/2, the area of leptoprosopy 12b is larger at this time, and first is swollen at this time
The resultant force of expansive force is larger；When the ratio of the two is less than 1/10, at this point, in the case where 11 identical capacity of secondary cell, wide face
14a area is excessive, infiltrates so as to cause electrolyte difficult.
The electrode unit 14 of the present embodiment is preferably formed by the first pole piece 141, the second pole piece 142 and diaphragm 143 winding.
The electrode unit 14 of the present embodiment is flat structure.Electrode unit 14 include opposite two winding end faces and with winding end
The perpendicular winding axis in face.Shown in Figure 3, electrode unit 14 includes width face 14a and leptoprosopy 14b.Wherein, leptoprosopy 14b
Including at least the circular arc sector of part, the quantity of wide face 14a and the quantity of leptoprosopy 14b are two.Face 14a two wide is along second
Direction Y is oppositely arranged, and each width face 14a is perpendicular to second direction Y, and two leptoprosopy 14b are oppositely arranged along first direction X
And it is connected to the respectively two sides opposite along first direction X face 14a two wide.Wide face 14a and leptoprosopy 14b surrounds electrode list
The winding axis of member 14 is arranged alternately.The respective width face 14a of two neighboring electrode unit 14 contacts with each other.The electrode of the present embodiment
When unit 14 expands, wide face 14a and leptoprosopy 14b can be expanded.Wide face 14a is expanded simultaneously on second direction Y
And the swell increment of width face 14a is greater than the swell increment of leptoprosopy 14b.In one example, wide face 14a is burnishing surface, and leptoprosopy 14b is
Arcwall face.
Shown in Figure 3, the electrode unit 14 that the winding of the present embodiment is formed itself is radially forming the first pole of multilayer
Piece 141.There is the first gap 16 corresponding with the position leptoprosopy 14b between the first pole piece of two adjacent rings 141.The first pole of two adjacent rings
There is the second gap 17 corresponding with the position wide face 14a between piece 141.Here, between the size L1 and second in the first gap 16
The size L2 of gap 17 refer to gap between diaphragm 143 and the first pole piece 141 and diaphragm 143 and the second pole piece 142 it
Between the sum of gap.The active material coated on the first pole piece 141 or the second pole piece 142 of electrode unit 14 expands
When, due to the effect of expansive force, every layer of first pole piece 141 can be subjected to displacement along the radial direction of electrode unit 14, and the first gap 16
The displacement of every layer of first pole piece 141 can be absorbed with the second gap 17, therefore effectively reduces the leptoprosopy 14b of electrode unit 14
With the expansion displacement amount of wide face 14a, to effectively reduce the whole expansive force released in all directions of electrode unit 14.?
In one embodiment, the size L1 in the first gap 16 is greater than the size L2 in the second gap 17, so that the first gap 16 is relative to the
Two gaps 17 can absorb bigger 141 expansion displacement amount of the first pole piece, so that the expansion displacement of the leptoprosopy 14b of electrode unit 14
Amount is less than the expansion displacement amount of the wide face 14a of electrode unit 14, to reduce the tired of expansive force X in a first direction to a greater extent
Product.In one embodiment, the first gap 16 and the second gap 17 are by the gap shape between the first pole piece 141 of identical two circle
At.In one embodiment, the size L1 in the first gap 16 is 5um to 50um.When the first gap 16 size L1 be less than 5um,
When electrode unit 14 expands, the leptoprosopy 14b of electrode unit 14 can touch shell 12 earlier, so that electrode unit 14 exists
Leptoprosopy 14b is touched when continuing expansion after shell 12, will receive biggish reaction force, and then the electrolyte in the first gap 16
Discharge can be extruded, cause lithium ion can not normal transmission, influence the service life of secondary cell 11.Simultaneously as electrode list
The leptoprosopy 14b of member 14 is constrained by shell 12, so that expansive force can be shifted to wide face 14a, it is excessive so as to cause expansive force
Ground is accumulated on X in a first direction.When the size L1 in the first gap 16 is greater than 50um, between the first pole piece of adjacent two layers 141
First gap 16 can be excessive, causes lithium ion transport overlong time, to cause leptoprosopy 14b dynamic performance poor, is easy to
Now analyse lithium phenomenon.
The material of the shell 12 of the present embodiment is preferably metal material.Shown in Figure 2, shell 12 includes the first side wall
121, second sidewall 122 and the bottom wall 123 being connected with the first side wall 121 and second sidewall 122.Cap assembly 15 and bottom wall
The 123 corresponding settings of Y in a second direction.Cap assembly 15 and the first side wall 121 and second sidewall 122 are tightly connected.First side
The area of wall 121 is greater than the area of second sidewall 122, also greater than the area of bottom wall 123.The first of two neighboring secondary cell 11
Side wall 121 is oppositely arranged.Referring to fig. 4 or shown in Fig. 5, leptoprosopy 14b setting corresponding with the first side wall 121.Under specific circumstances,
The leptoprosopy 14b of electrode unit 14 can also be expanded, but its swell increment is smaller, and the compression applied to the first side wall 121 is smaller,
Expansive force resultant force to be accumulated on each secondary cell 11 in a first direction X is smaller, furthermore due to the face of the first side wall 121
Product is larger, can reduce the deformation extent of the first side wall 121.Meanwhile the swell increment of electrode unit 14 is bigger, and 16 He of the first gap
The size L2 in the second gap 17 will be smaller.In 14 use process of electrode unit, the electrolyte of therein can be consumed, therefore need
It will be constantly from external complement electrolyte.When electrode unit 14 expands, the first side wall 121 can play leptoprosopy 14b
Effect of contraction is difficult to supplement by the first gap 16 so that the first gap 16 can become smaller so as to cause the electrolyte in shell 12
To inside electrode unit 14, the electric property of electrode unit 14 is influenced.In addition, being located at most when electrode unit 14 expands
The first pole piece 141 or the second pole piece 142 of outer layer can bear biggish tensile stress, to be easy to lead to the first pole piece 141 or the
The fracture of two pole pieces 142.The first side wall 121 of the present embodiment can play effect of contraction to leptoprosopy 14b, and leptoprosopy 14b is prevented to expand
Measure it is excessive, to be effectively reduced the first pole piece 141 or a possibility that the second pole piece 142 is broken.In one example, first
The quantity of side wall 121 and second sidewall 122 is two.The first side wall 121 and second sidewall 122 are arranged alternately, to construct
It is the tubular structure of rectangle at cross section.Bottom wall 123 is rectangular plate-like structure, is sealed with the first side wall 121 and second sidewall 122
Connection.
In one embodiment, shown in Figure 5, there is third space 18 between leptoprosopy 14b and the first side wall 121.The
The size L3 in three gaps 18 is 0.3mm to 0.9mm.When the size L3 of third space 18 is less than 0.3mm, the leptoprosopy of electrode unit 14
The degree that 14b is expanded will occupy third space 18 when smaller completely and contact with the first side wall 121 and to the first side wall
121 apply compression, so that electrode unit 14 is to the first side wall when the leptoprosopy 14b of electrode unit 14 reaches maximum swelling amount
121 stress applied can be excessive, and then can result in the first side wall 121 and deform or cause entire battery modules 10 the
It deforms on one direction X.When the size L3 of third space 18 is greater than 0.9mm, what the leptoprosopy 14b of electrode unit 14 was expanded
Degree can occupy third space 18 when larger completely and contact with the first side wall 121, can not so as to cause the first side wall 121
Operative constraint is formed to electrode unit 14, and then occurs leading to electrode list because the leptoprosopy 14b swell increment of electrode unit 14 is excessive
There is a situation where be broken for first 14 outermost first pole pieces 141 or the second pole piece 142.
In one embodiment, the first side wall 121 and the thickness of second sidewall 122 are respectively less than the thickness M of bottom wall 123.By
In the main expansion direction of electrode unit 14 of the present embodiment be Y in a second direction, therefore when electrode unit 14 expands, phase
For the first side wall 121 and second sidewall 122, the stress that electrode unit 14 applies bottom wall 123 is bigger.Increase bottom wall 123
Thickness M can enhance the intensity of bottom wall 123, improve restraint performance and itself anti-deformation to electrode unit 14.In electricity
Towards in the embodiment of bottom wall 123, bottom wall 123 plays constraint to the swell increment of electrode unit 14 and makees the wide face 14a of pole unit 14
With, so that the swell increment of electrode unit 14 is not too big, so that the first gap 16 will not be occupied by complete extruding and be disappeared, guarantee
Electrolyte in first gap 16 is sufficient.In addition, reducing the thickness of the first side wall 121 and second sidewall 122, two are advantageously reduced
The whole weight of primary cell 11, to be conducive to improve the energy density of secondary cell 11 and battery modules 10.
Shown in Figure 1, the battery modules 10 of the present embodiment further include first end plate 19 and the second end plate 20.First end plate
19 and second end plate 20 along the interval first direction X be arranged.More than two secondary cells 11 are set to first end plate 19 and second
Between end plate 20.First end plate 19 and the Young's modulus of the second end plate 20 are respectively less than 30Gpa.Due to the present embodiment battery modules 10
Expansive force of the included each secondary cell 11 in a first direction on X is smaller, therefore first end plate 19 and the second end plate 20 exist
Thickness on first direction X can design it is smaller, itself stiffness and strength require it is relatively low, to be conducive to mitigation first
The weight of end plate 19 and the second end plate 20 is conducive to the energy density for promoting secondary cell 11 and battery modules 10, while also dropping
The restriction of the low material to first end plate 19 and the second end plate 20, selection is more extensive, reduces processing and manufacturing difficulty and cost.?
In one embodiment, battery modules 10 further include the connector connecting simultaneously with first end plate 19 and the second end plate 20.Connector
First end plate 19 and the second end plate 20 can be tensed, to tense each secondary cell 11, promotes the position of each secondary cell 11
Set stability.
The battery modules 10 of the utility model embodiment include more than two secondary electricity being arranged side by side along first direction X
Pond 11.Y is stacked electrode unit 14 included by each secondary cell 11 in a second direction.The electrode unit 14 of the present embodiment
When expanding, main Y dilatancy in a second direction, and the swell increment in a first direction on X is smaller.In this way, each secondary
The expansion resultant force that battery 11 is accumulated on X in a first direction is smaller.In a first direction on X, battery modules 10 are not needed using having
The structural member of higher-strength can constrain counteracting expansive force to constrain counteracting expansive force or the more low intensive structural member of use, thus
The total quality of battery modules 10 is effectively reduced, so that 10 self structure of battery modules is more compact, effectively promotes battery modules
10 energy density.Meanwhile swell increment is smaller on X in a first direction for battery modules 10 itself, can effectively promote use process
Safety.
Referring to shown in Fig. 6 and Fig. 7, the utility model embodiment also provides a kind of battery pack 30.The battery pack 30 can answer
For vehicles such as automobiles.Automobile has the receiving cabinet for accommodating battery pack 30, and the bottom of automobile can be located at by accommodating cabinet generally,
And the chassis of automobile is closer with ground distance, and the height for accommodating cabinet determines the height space of automobile, therefore, in order to reduce
The height space of automobile, this requires accommodating cabinet to lengthen on the length direction of automobile or width direction, and battery pack 30
It will correspondingly be lengthened with the length of battery modules 10, at this point, expansive force in the longitudinal direction increases accordingly, this just needs electricity
Pond packet 30 not only can be reduced the occupied space in automobile short transverse, but also the expansive force of length direction can be made to be unlikely to excessive.Automobile
Short transverse it is parallel with second direction Y, one in motor vehicle length direction or width direction is identical as first direction X.
The battery pack 30 of the present embodiment includes the battery modules of cabinet 31 and the above-described embodiment being set in cabinet 31
10.The quantity of battery modules 10 can be one, be also possible to two or more.
The cabinet 31 of the present embodiment has the accommodating chamber 31a for accommodating battery modules 10.In one embodiment, case
Body 31 includes upper cover 311 and bottom case 312.Upper cover 311 and bottom case 312 can be tightly connected so that battery modules 10 are sealed in receiving
In chamber 31a.The battery modules 10 for being housed inside accommodating chamber 31a can be connected and fixed with bottom case 312.
In one embodiment, the height N of cabinet 31 greater than one times of secondary cell 11 height H and less than twice two
The height H of primary cell 11, wherein the short transverse of cabinet 31 is identical as second direction Y.In this way, cabinet 31 and battery modules 10
Each secondary cell 11 between be reserved with gap.Electrode unit 14 occurs excessively to expand and applies excessive answer to cap assembly 15
When power, which can form cap assembly 15 and step down, and cap assembly 15 is disconnected with shell 12, to drop
The excessively expansion of low secondary cell 11 can not pressure release and a possibility that explode.
In one embodiment, battery pack 30 includes 2 to 6 battery modules arranged along the width direction of cabinet 31
10.Each battery modules 10 include 20 to 32 secondary cells 11.In the present embodiment, the width direction and first party of cabinet 31
It is perpendicular to X and second direction Y, and the length direction of cabinet 31 is identical as first direction X.Due to the secondary cell of the present embodiment
11 swell increment in a first direction on X is smaller, therefore more secondary cells 11 can be arranged side by side on X in a first direction, from
And greatly promote the energy density of battery modules 10.
In one embodiment, the thickness D of secondary cell 11 is (shown in Figure 1) is more than or equal to 50mm.Secondary cell 11
Height H it is (shown in Figure 4) be more than or equal to 80mm.The thickness direction of secondary cell 11 is identical as first direction X.Secondary cell
11 short transverse is identical as second direction Y.
The battery pack 30 of the present embodiment is included including cabinet 31 and battery modules 10.When battery modules 10 expand, battery
Swell increment of the mould group 10 on the length direction of cabinet 31 is smaller, thus the expansive force that battery modules 10 discharge in the longitudinal direction
Smaller, the stress applied to cabinet 31 is smaller.In this way, not needing in a first direction on X using the higher structural member of structural strength
Battery modules 10 are constrained, the volume and weight for reducing structural member is conducive to, so that being conducive to battery pack 30 designs lightweight, are mentioned
The energy density of high battery pack 30.Also do not need cabinet 31 simultaneously has stronger stiffness and strength on X in a first direction, reduces
The structural requirement of cabinet 31.
Although the present utility model has been described by reference to the preferred embodiments, but in the model for not departing from the utility model
In the case where enclosing, various improvement can be carried out to it and can replace component therein with equivalent, especially, as long as not depositing
In structural conflict, items technical characteristic mentioned in the various embodiments be can be combined in any way.The utility model
It is not limited to specific embodiment disclosed herein, but is included all technical solutions falling within the scope of the claims.
Claims (15)
1. a kind of battery modules characterized by comprising
More than two secondary cells, more than two secondary cells are arranged side by side along first direction, the secondary cell
Including shell, electrode assembly and closure, the shell includes the receiving hole with opening, and the receiving hole is in a second direction
Extend, the first direction and second direction intersection, the closure are connect to cover and close described open with the housing seal
Mouthful, the electrode assembly is set in the receiving hole and including more than two electrode units, and the electrode unit includes
First pole piece, the second pole piece and diaphragm, more than two electrode units are stacked along the second direction.
2. battery modules according to claim 1, which is characterized in that the electrode unit includes wide face and leptoprosopy, described
Wide face is oppositely arranged with the closure, and the leptoprosopy is located at the wide face along the side of the first direction, the width face
Area is greater than the area of the leptoprosopy.
3. battery modules according to claim 2, which is characterized in that the area of the leptoprosopy and the area in the wide face
Ratio is 1/10~1/2.
4. battery modules according to claim 2, which is characterized in that first pole piece, second pole piece and described
Membrane winding forms the electrode unit, and the electrode unit is flat structure, and including two wide faces and two institutes
Leptoprosopy is stated, two leptoprosopy are connected to the wide face two sides opposite along the first direction.
5. battery modules according to claim 4, which is characterized in that have and institute between the first pole piece described in two adjacent rings
Corresponding first gap in leptoprosopy position is stated, the size in first gap is 5um to 50um.
6. battery modules according to claim 4, which is characterized in that have and institute between the first pole piece described in two adjacent rings
It states corresponding first gap in leptoprosopy position and the second gap corresponding with the wide face position, the size in first gap is big
Size in second gap.
7. battery modules according to claim 4, which is characterized in that the material of the shell is metal material, the shell
Body includes the first side wall, second sidewall and the bottom wall being connected with the first side wall and the second sidewall, and described first
The area of side wall is greater than the area of the second sidewall, the bottom wall, the first side wall of the two neighboring secondary cell
It is oppositely arranged, leptoprosopy setting corresponding with the first side wall.
8. battery modules according to claim 7, which is characterized in that have the between the leptoprosopy and the first side wall
Three gaps, the size of the third space are 0.3mm to 0.9mm.
9. battery modules according to claim 7, which is characterized in that the thickness of the first side wall and the second sidewall
The thickness of the respectively less than described bottom wall.
10. battery modules according to claim 1, which is characterized in that the closure includes lamina tecti and electrode terminal,
The lamina tecti and the electrode terminal are respectively positioned on the electrode assembly along the side of the second direction, the lamina tecti connection
In the shell, the electrode terminal is set to the lamina tecti and electrically connected to the electrode assembly.
11. the battery modules according to any of claims 1 to 10, the battery modules further include first end plate and second
End plate, the first end plate and second end plate are arranged along the first direction interval, more than two secondary cells
It is set between the first end plate and second end plate, the Young's modulus of the first end plate and second end plate is less than
30Gpa。
12. a kind of battery pack characterized by comprising
Cabinet has accommodating chamber；Battery modules as described in any one of claim 1 to 11, the battery modules are received
In the accommodating chamber.
13. battery pack according to claim 12, which is characterized in that along the second direction, the height of the cabinet is big
In the height of one times of the secondary cell and the height of the secondary cell less than twice.
14. battery pack according to claim 12, which is characterized in that the battery pack includes along the width side of the cabinet
To 2 to 6 battery modules of arrangement, each battery modules include 20 to 32 secondary cells.
15. battery pack described in 3 or 14 according to claim 1, which is characterized in that the thickness of the secondary cell is more than or equal to
The height of 50mm, the secondary cell are more than or equal to 80mm.
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| CN201822273635.5U CN209217068U (en) | 2018-12-29 | 2018-12-29 | Battery modules and battery pack |
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| CN201822273635.5U CN209217068U (en) | 2018-12-29 | 2018-12-29 | Battery modules and battery pack |
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| WO2020134748A1 (en) * | 2018-12-29 | 2020-07-02 | 宁德时代新能源科技股份有限公司 | Secondary battery, battery module, and manufacturing method for secondary battery |
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