CN114079101A - Battery module and battery box with heating function - Google Patents
Battery module and battery box with heating function Download PDFInfo
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- CN114079101A CN114079101A CN202010809040.6A CN202010809040A CN114079101A CN 114079101 A CN114079101 A CN 114079101A CN 202010809040 A CN202010809040 A CN 202010809040A CN 114079101 A CN114079101 A CN 114079101A
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- heating film
- heating
- battery module
- battery
- end plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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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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- Electromagnetism (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention relates to a battery module and a battery box with a heating function, the battery module with the heating function comprises a battery core, an end plate and a heating film, the heating film is fixedly bonded with the battery core, two ends of the heating film of the battery module are connected with the end plate through a connecting piece, a stop structure on the connecting piece can prevent the end part of the heating film from warping and improve the fixing effect of the heating film, compared with the prior fixing mode that the heating film is only bonded, after the battery module expands, the stress on the end part of the heating film in the stacking direction of the battery core is unbalanced, the end part of the heating film is easy to warp, the stopping structure can be matched with the end part of the heating film in a stopping way, so that the end part of the heating film is not warped, and the technical problem that the service life of the battery module is shortened because the heating film is easy to fall off by adhering the heating film to the module to realize fixation in the conventional battery module is solved.
Description
Technical Field
The invention relates to a battery module with a heating function and a battery box.
Background
The existing battery box can be influenced by the ambient temperature when in use, and the battery discharge capacity is poorer at low temperature. In addition, at low temperature, the conductivity of charged ions inside the battery is poor, the ability of charge transfer and intercalation inside the negative electrode material structure is also poor, and a large amount of lithium ions are accumulated on the negative electrode surface and cannot be intercalated during charging at low temperature. The electron deposition on the electrode surface can cause the lithium simple substance to pile up, and the lithium metal is very easy to have the phenomenon of uneven crystal growth, and the dendritic crystal grows to a sufficient scale, so that the diaphragm can be pierced, and the direct communication between the anode and the cathode is caused to form an internal short circuit in the battery core.
The problem that battery box charge and discharge exist under low temperature environment can be solved through set up the heating film in the battery box, and the heating film bonds usually to fix on the side of electric core at present, and the heating film is heated electric core through the heat that produces after the circular telegram, improves the temperature in the battery box. Because electric core can expand at the charge-discharge in-process, paste the heating film on the module and can receive the effect of module inflation cross stress, drop from the module easily, influence the life of battery module.
Disclosure of Invention
The invention aims to provide a battery module with a heating function, and the battery module is used for solving the technical problem that the service life of the battery module is shortened due to the fact that a heating film is bonded to the module to be fixed in the conventional battery module and is easy to fall off.
Another object of the present invention is to provide a battery box using the battery module, so as to solve the technical problem of the current battery box that the service life of the battery box is low due to the easy falling of the heating film in the battery module.
In order to achieve the purpose, the battery module with the heating function adopts the following technical scheme:
the battery module with the heating function includes:
the battery cell comprises a plurality of battery cells, wherein the plurality of battery cells are stacked along the front-back direction to form a battery cell group;
the end plates are arranged at the front end and the rear end of the electric core group;
the heating film extends in the front-back direction, is arranged on at least one of the left side surface and the right side surface of the electric core group and is used for heating the electric core;
the heating film is fixedly bonded with the battery core;
the end parts of the heating films at the front end and the rear end of the heating film are connected with the end plates at the two ends through the connecting pieces, and the connecting pieces are provided with stop structures for limiting the end parts of the heating films to move towards the direction far away from the electric core group.
Has the advantages that: compared with the prior fixing mode that the heating film is only glued, the stop structure on the connecting piece can prevent the movable end from warping, and the fixing effect of the heating film is improved.
Furthermore, at least one of the front end and the rear end of the heating film is a movable end, and an end plate connected with the movable end is a movable end connecting end plate; the movable end and/or the movable end connecting end plate is provided with a long hole or a long groove which is matched with the connecting piece in a sliding way in the front-back direction, so that the movable end and the movable end connecting end plate can move relatively in the front-back direction.
Has the advantages that: the movable end and/or the long hole or the long groove on the movable end connecting end plate enable the movable end and the end plate to move relatively, so that the heating film is convenient to install, can adapt to the expansion of the electric core group, and is not easy to fall off.
Furthermore, the connecting piece connected with the movable end connecting end plate is used for pressing the movable end on the movable end connecting end plate, and the movable end connecting end plate move relatively in the front-back direction when the expansion force of the module driving the movable end and the movable end to move relatively in the front-back direction is larger than the maximum static friction force between the movable end and the movable end.
Has the advantages that: the movable end is pressed against the end plate to stabilize the movable end.
Furthermore, the movable end is provided with the long hole, the connecting piece is clamped on the corresponding end plate, and the blocking structure on the connecting piece is a blocking cap positioned on one side of the heating film back to the electric core.
Has the advantages that: the connecting piece is clamped above the end plate and is convenient to mount.
Further, the one end of heating film is the location stiff end, and the end plate of being connected with the location stiff end is stiff end connection end plate, and the location stiff end passes through the connecting piece to be fixed at the stiff end and connects the end plate, and the stiff end is connected and is equipped with location structure between end plate and the location stiff end, perhaps the stiff end is connected the end plate and is passed through the connecting piece location with the location stiff end.
Has the advantages that: one end of the heating film is fixed, and the other end of the heating film is movable, so that the heating film is convenient to position and mount.
Further, a weak part is arranged on the heating film, and a hole or a seam penetrating through two sides of the heating film is formed in the weak part; or the weak part is provided with a thinning dent with the thinned thickness;
the weak portion extends in a direction perpendicular to the arrangement direction of the cells, and is opposed to the stacking position of two adjacent cells.
Has the advantages that: electric core is when charge-discharge, two adjacent electric cores can expand, the interval that the position was piled up to electric core can the grow, because the side and the heating film relatively fixed of electric core, when alternating bulging force transmits weak part department, because opening that hole or seam formed on the heating film can the grow, the attenuate makes thick attenuation and easier deformation of membrane, thereby can make when the heating film receives external force in the heating film lie in the part of weak part both sides keep away from each other, the deformation of lengthening through weak part weakens the influence of alternating bulging force to heating film rest part, rest part is difficult to come unstuck with electric core, can improve the deformability of heating film under the prerequisite of not changing the heating film material, and the production cost is reduced.
Further, two adjacent weak parts in the cell arrangement direction both satisfy: the hole or slit or thinned recess in one weakened portion is located above and the hole or slit or thinned recess in the other weakened portion is located below.
Has the advantages that: when the heating film is influenced by the alternating expansion force, the deformation of the part above the heating film is relatively balanced with the deformation of the part below the heating film, so that the heating film is prevented from being stretched into a trapezoid or inverted trapezoid shape and the like, and the heating film is prevented from being broken due to stress concentration in the heating film, and the capacity of resisting the alternating expansion force of the heating film is improved.
Furthermore, the left side face and the right side face of the electric core group are provided with heating films, in two weak parts opposite to the stacking position of the same pair of adjacent electric cores on the heating films on the left side and the right side, a hole or a seam or a thinning recess on one side is arranged on the upper side, and a hole or a seam or a thinning recess on the other side is arranged on the lower side.
Has the advantages that: arrange like this and to make the left heating film of electric core and the heating film on electric core right side to pull open the position that warp and stagger in the up-down direction with the alternating bulging force, avoid appearing electric core one end in the up-down direction and tightly tighten, the condition that the other end relaxes makes the heating film can bear higher alternating bulging force.
Further, a gap exists between the weak part on the heating film and the stacking position of the adjacent battery cells, and the hole or the seam on the weak part is communicated with the gap.
Has the advantages that: the heating film can play an unloading role through the holes or the slits in the process that the module bears alternating expansion force, and the deformation of the heating film is facilitated at intervals.
The technical scheme of the battery box of the invention is as follows:
the battery box comprises a box body and a battery module;
the battery module is installed in the box, includes:
the battery cell comprises a plurality of battery cells, wherein the plurality of battery cells are stacked along the front-back direction to form a battery cell group;
the end plates are arranged at the front end and the rear end of the electric core group;
the heating film extends in the front-back direction, is arranged on at least one of the left side surface and the right side surface of the electric core group and is used for heating the electric core;
the heating film is fixedly bonded with the battery core;
the end parts of the heating films at the front end and the rear end of the heating film are connected with the end plates at the two ends through the connecting pieces, and the connecting pieces are provided with stop structures for limiting the end parts of the heating films to move towards the direction far away from the electric core group.
Has the advantages that: compared with the prior fixing mode that the heating film is only glued, the stop structure on the connecting piece can prevent the end part of the heating film from warping in the stacking direction of the battery core after the battery module expands, and the end part of the heating film is easy to warp.
Furthermore, at least one of the front end and the rear end of the heating film is a movable end, and an end plate connected with the movable end is a movable end connecting end plate; the movable end and/or the movable end connecting end plate is provided with a long hole or a long groove which is matched with the connecting piece in a sliding way in the front-back direction, so that the movable end and the movable end connecting end plate can move relatively in the front-back direction.
Has the advantages that: the movable end and/or the long hole or the long groove on the movable end connecting end plate enable the movable end and the end plate to move relatively, so that the heating film is convenient to install, can adapt to the expansion of the electric core group, and is not easy to fall off.
Furthermore, the connecting piece connected with the movable end connecting end plate is used for pressing the movable end on the movable end connecting end plate, and the movable end connecting end plate move relatively in the front-back direction when the expansion force of the module driving the movable end and the movable end to move relatively in the front-back direction is larger than the maximum static friction force between the movable end and the movable end.
Has the advantages that: the movable end is pressed against the end plate to stabilize the movable end.
Furthermore, the movable end is provided with the long hole, the connecting piece is clamped on the corresponding end plate, and the blocking structure on the connecting piece is a blocking cap positioned on one side of the heating film back to the electric core.
Has the advantages that: the connecting piece is clamped above the end plate and is convenient to mount.
Further, the one end of heating film is the location stiff end, and the end plate of being connected with the location stiff end is stiff end connection end plate, and the location stiff end passes through the connecting piece to be fixed at the stiff end and connects the end plate, and the stiff end is connected and is equipped with location structure between end plate and the location stiff end, perhaps the stiff end is connected the end plate and is passed through the connecting piece location with the location stiff end.
Has the advantages that: one end of the heating film is fixed, and the other end of the heating film is movable, so that the heating film is convenient to position and mount.
Further, a weak part is arranged on the heating film, and a hole or a seam penetrating through two sides of the heating film is formed in the weak part; or the weak part is provided with a thinning dent with the thinned thickness;
the weak portion extends in a direction perpendicular to the arrangement direction of the cells, and is opposed to the stacking position of two adjacent cells.
Has the advantages that: electric core is when charge-discharge, two adjacent electric cores can expand, the interval that the position was piled up to electric core can the grow, because the side and the heating film relatively fixed of electric core, when alternating bulging force transmits weak part department, because opening that hole or seam formed on the heating film can the grow, the attenuate makes thick attenuation and easier deformation of membrane, thereby can make when the heating film receives external force in the heating film lie in the part of weak part both sides keep away from each other, the deformation of lengthening through weak part weakens the influence of alternating bulging force to heating film rest part, rest part is difficult to come unstuck with electric core, can improve the deformability of heating film under the prerequisite of not changing the heating film material, and the production cost is reduced.
Further, two adjacent weak parts in the cell arrangement direction both satisfy: the hole or slit or thinned recess in one weakened portion is located above and the hole or slit or thinned recess in the other weakened portion is located below.
Has the advantages that: when the heating film is influenced by the alternating expansion force, the deformation of the part above the heating film is relatively balanced with the deformation of the part below the heating film, so that the heating film is prevented from being stretched into a trapezoid or inverted trapezoid shape and the like, and the heating film is prevented from being broken due to stress concentration in the heating film, and the capacity of resisting the alternating expansion force of the heating film is improved.
Furthermore, the left side face and the right side face of the electric core group are provided with heating films, in two weak parts opposite to the stacking position of the same pair of adjacent electric cores on the heating films on the left side and the right side, a hole or a seam or a thinning recess on one side is arranged on the upper side, and a hole or a seam or a thinning recess on the other side is arranged on the lower side.
Has the advantages that: arrange like this and to make the left heating film of electric core and the heating film on electric core right side to pull open the position that warp and stagger in the up-down direction with the alternating bulging force, avoid appearing electric core one end in the up-down direction and tightly tighten, the condition that the other end relaxes makes the heating film can bear higher alternating bulging force.
Further, a gap exists between the weak part on the heating film and the stacking position of the adjacent battery cells, and the hole or the seam on the weak part is communicated with the gap.
Has the advantages that: the heating film can play an unloading role through the holes or the slits in the process that the module bears alternating expansion force, and the deformation of the heating film is facilitated at intervals.
Drawings
Fig. 1 is a schematic structural view of a battery module according to embodiment 1 of the present invention;
fig. 2 is a schematic view of an installation structure of a movable end connection end plate and a heating film of a battery module having a heating function according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of the relative position of a heating film in embodiment 1 of the battery module with a heating function according to the present invention;
fig. 4 is a schematic structural view of a heating film at a cell stacking position in the battery module according to embodiment 1 of the present invention;
fig. 5 is a schematic structural view of a heating film in embodiment 1 of the battery module with a heating function according to the present invention;
fig. 6 is a sectional view of a heating film and a movable end connection end plate in embodiment 1 of the battery module having a heating function according to the present invention;
fig. 7 is a schematic structural view of the relative position of a heating film in embodiment 2 of the battery module with a heating function according to the present invention;
in the figure: 10-electric core; 11-chamfering; 12-an indent space; 20-an end plate; 201-movable end connecting end plate; 202-fixed end connecting end plate; 21-a clamping hole; 22-buckling; (ii) a 221-an expansion sleeve; 222-a set screw; 223-a stop cap; 30-heating the film; 31-relief holes; 32-unloading the seam; 33-terminal; 341-positioning fixed end; 342-a movable end; 35-long holes; 36-the weak portion.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention, i.e., the embodiments described are only a subset of the embodiments of the invention and are not all embodiments. The components of a particular embodiment of the present invention, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of specific embodiments of the invention presented in the figures is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the specific embodiments of the invention without making any creative effort, fall within the protection scope of the invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the battery case and the battery module according to the present invention will be described in further detail with reference to specific embodiments.
Embodiment 1 of the battery module having a heating function in the present invention: as shown in fig. 1 to 6, the battery module mainly includes a cell 10, an end plate, and a heating film 30. The plurality of battery cells 10 are stacked along the thickness direction of the battery cells 10 to form a battery cell group, and the battery cells 10 are relatively fixed by gluing. The stacking direction of the battery cells is the front-back direction, and the front end and the back end of the heating film 30 are a fixed end 341 and a movable end 342 respectively. The end plates 20 are two, namely a movable end connecting end plate 201 and a fixed end connecting end plate 202, and the movable end connecting end plate 201 and the fixed end connecting end plate 202 are respectively arranged at the front end and the rear end of the electric core pack.
In this embodiment, the heating films 30 are bonded and fixed to the left and right sides of the electric core group, and the electric core can be heated by the heating films 30 after being electrified, so that the temperature of the working environment of the electric core 10 is increased. The heating film 30 is in a strip shape and extends in the front-back direction, the heating film 30 includes a film body and a heating wire fixed in the film body (the dotted line in fig. 5 indicates a wire running region of the heating wire), two terminals 33 of the heating wire are respectively located at the front and back ends of the heating film, and in this embodiment, the two heating films are connected in series through two terminals of the movable end 342. In other embodiments, the heating films on the left and right sides may be integrally disposed, and the heating films are integrally U-shaped. In other embodiments, a plurality of heating wires may be disposed on the heating film, for example, the number of the heating wires corresponds to the number of the battery cells one to one, at this time, each heating wire has two terminals, at this time, the two terminals of the heating wire are disposed on the upper side, and the terminals of the heating wires are integrated together, so that the installation is facilitated.
In the process of charging and discharging of the battery core, the battery core 10 expands and contracts to generate an alternating expansion force, in the stacking direction of the battery cores 10, the expansion forces of the battery cores 10 are mutually superposed, the heating film 30 is subjected to pulling action force of the battery core 10 in the front-back direction, the end portion of the heating film is easy to warp and deform due to unbalanced stress, and separation of the battery core 10 from the positioning fixed end 341 and the movable end 342 is intensified, in order to improve the fixing effect of the heating film 30, in the present embodiment, the movable end 342 is provided with a long hole 35, the long waist of the long hole 35 extends in the front-back direction, the movable end connection end plate 201 is provided with a clamping hole 21 corresponding to the long hole 35, the movable end connection end plate 201 is further provided with a columnar buckle 22, the buckle 22 passes through the long hole 35 and the clamping hole 21 and then is clamped on the movable end connection end plate 201, the buckle 22 and the long hole 35 can be in sliding fit in the front-back direction before fixing, so that the movable end 342 and the movable end connection end plate 201 can relatively move in the front-back direction, to facilitate installation. After the buckle 22 is installed, the movable end 342 is pressed on the movable end connection end plate 201, and a certain pressure exists between the movable end and the movable end connection end plate, but after the battery cell expands, the movable end and the movable end connection end plate can move relatively in the front-back direction when the acting force along the front-back direction is applied, and the acting force is larger than the acting force of the maximum static friction force between the movable end and the movable end connection end plate.
In this embodiment, the buckle 22 includes an expansion sleeve 221 and a fixing screw 222, the expansion sleeve 221 is inserted into the fastening hole, and the fixing screw 222 is screwed into the expansion sleeve 221 to fasten the expansion sleeve 221 and the fastening hole. In this embodiment, the positioning fixing end 341 of the heating film is provided with a circular hole, and the fixing end connection end plate 202 is also provided with a circular hole, so that the positioning fixing plate of the heating film is fixed with the fixing end connection end plate 202 by a buckle. The front end and the rear end of the heating film are ensured not to be warped and deformed. The round hole on stiff end connection end plate and the heating film forms the locating hole with the buckle location, and the stiff end connection end plate passes through the buckle location with the location stiff end. In other embodiments, a positioning structure may be disposed between the fixed end connection end plate and the positioning fixed end, for example, a positioning protrusion is disposed on the fixed end connection end plate, and the positioning fixed end is provided with a positioning hole. In other embodiments, a positioning pin may be inserted into the end plate after penetrating through the positioning fixing end, the positioning pin has no stop cap, and a fixing bolt may be additionally provided to fix the heating film and the fixing end to connect the end plate.
When the heating film fixing device is used, the fixed end 341 of the heating film is fixed through the buckle, and then the movable end 342 is pressed through the buckle, so that wrinkles in the middle of the heating film are avoided, and the heating film is convenient to mount. In other embodiments, the fixed positioning and fixing end can also be a fixing bolt, a positioning pin with a blocking cap and the like. In other embodiments, both ends of the heating film may be movable ends, or both ends may be fixed ends.
The end of the fixing screw 222 is provided with a blocking cap 223, the blocking cap 223 is arranged at one end of the buckle 22 away from the end plate 20, the side surface of the blocking cap 223 facing the heating film 30 is matched with the heating film 30 in a blocking manner, so that the heating film 30 is limited to move in a direction away from the battery cell 10, under the action of the blocking cap 223, the heating film 30 is not easy to warp, and the bonding position between the heating film 30 and the battery cell 10 is not easy to come unstuck, so that the fixing effect of the heating film 30 is better. Even if the heating film is degummed, the heating film is not warped, the contact area between the heating film and the module is not influenced, and the heating film can normally heat the battery cell. The buckle in the embodiment forms a connecting piece for connecting the front end and the rear end of the heating film with the end plate, and the stop cap forms a stop structure for limiting the end part of the heating film to move towards the direction far away from the electric core group.
The heating film 30 is provided with an unloading hole 31, the unloading hole 31 is formed in a weak portion 36 which is easily deformed when an external force is applied, the unloading hole 31 is an oblong through hole, and the waist of the unloading hole 31 extends in the vertical direction, that is, in the height direction of the battery cell 10.
In this embodiment, the plurality of weak portions 36 extend vertically and are provided, each weak portion 36 is provided with one unloading hole 31, each unloading hole 31 is provided at intervals in the length direction of the heating film 30, when the heating film 30 is influenced by the alternating expansion force in the front-rear direction, the heating film 30 is stretched in the front-rear direction, the alternating expansion force is transmitted to the unloading hole 31, the unloading hole 30 deforms, and the portions of the weak portions 36 on both sides of the unloading hole are away from each other, so that the heating film 30 adapts to the deformation of the electric core group. In other embodiments, the number of the relief holes may be set according to the requirement, for example, two relief holes are set at a weak portion, and two relief holes are set up above each other.
In this embodiment, the unloading hole is an oblong hole, and when the heating film is pulled and deformed, there is no sharp corner at both ends of the unloading hole, which can effectively prevent the heating film from tearing at the end of the unloading hole.
As shown in fig. 1 and 4, a chamfer 11 is formed at an edge extending up and down from the cell casing, when two cells 10 are stacked, an inner concave space 12 is formed by the two chamfers 11, after the heating film 30 is bonded and fixed with the cells 10, no adhesive is applied to the inner concave space 12, and a weak portion 36 on the heating film 30 is opposite to the inner concave space 12 in the left-right direction, so that a gap exists between the weak portion 36 of the heating film 30 and the stacking position of the cells 10.
The position of the unloading hole 31 is opposite to the stacking position of two adjacent electric cores 10 in the electric core group, and the stacking position of the two electric cores 10 is the mutual bonding position of the two electric cores 10, so that the two adjacent electric cores 10 are respectively bonded and fixed with the parts of the heating film 30, which are positioned at the left and right sides of the unloading hole 31. When the battery cell 10 is expanded in charging and discharging, one side of each of the two adjacent battery cells 10 is bulged, the interval between the two adjacent battery cells 10 is increased, the unloading hole 31 is formed in the stacking position of the two battery cells 10, the weak portion 36 of the heating film 30 is more easily deformed and can adapt to the change of the interval between the two adjacent battery cells 10, and therefore the heating film 30 is kept to be bonded and fixed with the battery cells 10. In other embodiments, the unloading hole may not face the stacking position of two battery cells 10. Meanwhile, a gap may exist between the weak portion 36 of the heating film 30 and the stacking position of the battery cell 10, and glue is not injected into the gap when the battery module is assembled.
The unloading holes 31 are provided at the positions where the corresponding adjacent battery cells 10 are stacked, in the adjacent weak portions 36 on the same heating film 30, the unloading holes 31 are alternately arranged one above the other in the front-rear direction, i.e., the unloading hole 31 in one weak portion 36 extends upward from the middle of the heating film 30, the unloading hole 31 is provided upward, the unloading hole 31 in one weak portion 36 extends downward from the middle of the heating film 30, and the unloading hole 31 is provided downward. When the heating film 30 is affected by the alternating expansion force, the deformation amount of the upper portion of the heating film 30 is relatively balanced with the deformation amount of the lower portion of the heating film 30, so that the heating film 30 is prevented from being stretched into a trapezoidal or inverted trapezoidal shape, and the heating film 30 is prevented from being broken due to stress concentration.
In this embodiment, the heating films 30 are fixedly bonded to the left and right sides of the cell group, and in two weak portions 36 opposite to the stacking position of the same pair of adjacent cells 10 on the heating films 30 on the left side and the heating films 30 on the right side, the unloading hole 31 on one weak portion 36 is arranged above, and the unloading hole 31 on the other weak portion 36 is arranged below, and there are two distribution forms in this embodiment: one is that the unloading holes 31 of the left heating film 30 extend downward from the middle of the heating film 30 and the unloading holes 31 of the right heating film 30 extend upward from the middle of the heating film 30, and the other is that the unloading holes of the left heating film 30 extend upward from the middle of the heating film 30 and the unloading holes of the right heating film 30 extend downward from the middle of the heating film 30.
Of course, the battery module of the present invention is not limited to the technical solution provided in the above embodiment 1, and the technical solution provided in the following embodiment may also be adopted.
Embodiment 2 of the battery module having a heating function in the present invention: the difference from the above embodiment is that the heating film in this embodiment is provided with an unloading slit instead of the unloading hole in embodiment 1, as shown in fig. 7, the heating film 30 is provided with the unloading slit 32 by mechanical punching, the unloading slit 32 extends in a direction perpendicular to the stacking direction of the battery cells, the heating film 30 is broken at the unloading slit 32, and when the heating film 30 is stretched by the alternating expansion force, the opening at the unloading slit 32 is enlarged, so that the heating film 30 has a greater deformation degree. Meanwhile, round holes are punched at two ends of the unloading seam 32, and the edges of the round holes are in smooth transition, so that the heating film can be prevented from being torn at the round holes. It should be noted that the shape of the unloading slit in this embodiment is different from that of the unloading hole in embodiment 1, and the position of the unloading slit is the same as that of the unloading hole.
Embodiment 3 of the battery module having a heating function in the present invention: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the movable end connection end plate is also provided with a long hole extending forward and backward.
Embodiment 4 of the battery module having a heating function in the present invention: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: the connecting piece is a fixing bolt, the fixing bolt is fixed on the end plate in a threaded mode, and the bolt head of the fixing bolt limits the end portion of the heating film to move back to the battery cell. In other embodiments, the connecting member may also be a pin fixed to the end plate, and a stop cap is provided at one end of the pin to limit separation from the pin.
In embodiment 5 of the battery module having a heating function according to the present invention, the structure of the battery module in this embodiment is different from that of the above embodiment only in that: in this embodiment, the end plate is provided with a long groove extending forward and backward, and the connecting member is slidably fitted in the long groove. In another embodiment, a fixed plate may be provided at the movable end, and a long groove extending in the front-rear direction may be provided in the fixed plate, so that the clip can slide in the long groove, and the movable end and the end plate can move relative to each other in the front-rear direction.
In embodiment 6 of the battery module with a heating function according to the present invention, the structure of the battery module in this embodiment is different from that of the above embodiment only in that: the connecting piece in the embodiment is a connecting stud welded and fixed with the end plate, a nut is arranged on the connecting stud after the movable end is fixed, the nut forms a blocking structure, and the movable end is limited by the nut to move upwards away from the battery cell group.
Embodiment 7 of the battery module having a heating function in the present invention: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, an unloading groove that replaces the unloading hole is provided at the position of the unloading hole in embodiment 1, the unloading groove is a thinning recess that can thin the film thickness, the outer side surface of the heating film that is away from the electric core is recessed toward the inner side surface of the heating film that is close to the electric core, and the unloading groove is not arranged in a through manner in the thickness direction of the heating film, but the film thickness of the position of the unloading groove in the heating film is smaller than the film thickness of other portions, so that the heating film is more easily stretched and deformed at this position, and the deformation capability of the heating film is provided on the premise that the material of the heating film is not changed.
Embodiment 8 of the battery module having a heating function in the present invention: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the unloading holes are arranged on the heating film at intervals along the arrangement direction of the battery cells, and all the unloading holes on the same heating film are at the same height.
Embodiment 9 of the battery module having a heating function in the present invention: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the unloading holes on the left and right sides of the battery core are also located in the same height direction.
The specific embodiment of the battery box of the invention is as follows: the battery box includes a box body in which at least two battery modules are arranged, and the structure of the battery modules is the same as that of the battery modules in the above-described embodiment of the battery modules, and therefore, description about the embodiment of the battery box in the present invention will not be repeated.
The above-mentioned embodiments, the objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. Battery module with heating function includes:
the battery cell comprises a plurality of battery cells, wherein the plurality of battery cells are stacked along the front-back direction to form a battery cell group;
the end plates are arranged at the front end and the rear end of the electric core group;
the heating film extends in the front-back direction, is arranged on at least one of the left side surface and the right side surface of the electric core group and is used for heating the electric core;
the heating film is fixedly bonded with the battery core;
it is characterized in that the preparation method is characterized in that,
the end parts of the heating films at the front end and the rear end of the heating film are connected with the end plates at the two ends through the connecting pieces, and the connecting pieces are provided with stop structures for limiting the end parts of the heating films to move towards the direction far away from the electric core group.
2. The battery module with heating function according to claim 1, wherein at least one of the front and rear ends of the heating film is a movable end, and the end plate connected to the movable end is a movable end connection end plate; the movable end and/or the movable end connecting end plate is provided with a long hole or a long groove which is matched with the connecting piece in a sliding way in the front-back direction, so that the movable end and the movable end connecting end plate can move relatively in the front-back direction.
3. The battery module with heating function according to claim 2, wherein the connecting member connected to the movable end connection end plate serves to press the movable end against the movable end connection end plate, and the movable end connection end plate are relatively moved in the front-rear direction when subjected to a module expansion force that drives the relative movement therebetween in the front-rear direction, which is greater than a maximum static friction force therebetween.
4. The battery module with the heating function as claimed in claim 2 or 3, wherein the movable end is provided with the slot, the connecting member is clamped on the corresponding end plate, and the stopping structure on the connecting member is a stopping cap on a side of the heating film opposite to the battery core.
5. The battery module with the heating function as claimed in claim 2 or 3, wherein the heating film has a fixed end, an end plate connected to the fixed end is a fixed end connecting end plate, the fixed end is fixed to the fixed end connecting end plate via a connecting member, and a positioning structure is disposed between the fixed end connecting end plate and the fixed end, or the fixed end connecting end plate and the fixed end are positioned via a connecting member.
6. The battery module with the heating function according to claim 1, 2 or 3, wherein the heating film is provided with a weak portion, and the weak portion is provided with a hole or a slit penetrating both sides of the heating film; or the weak part is provided with a thinning dent with the thinned thickness;
the weak portion extends in a direction perpendicular to the arrangement direction of the cells, and is opposed to the stacking position of two adjacent cells.
7. The battery module with the heating function as claimed in claim 6, wherein two adjacent weak portions in the cell arrangement direction both satisfy: the hole or slit or thinned recess in one weakened portion is located above and the hole or slit or thinned recess in the other weakened portion is located below.
8. The battery module with the heating function as claimed in claim 6, wherein the heating films are disposed on the left side surface and the right side surface of the cell pack, and in the two weak portions of the heating films on the left side and the right side opposite to the stacking position of the same pair of adjacent cells, the hole or the slit or the thinning recess on one is disposed above, and the hole or the slit or the thinning recess on the other is disposed below.
9. The battery module with the heating function according to claim 6, wherein a gap is formed between the weak portion of the heating film and the adjacent cell stacking position, and the hole or the slit of the weak portion is communicated with the gap.
10. A battery case, comprising:
a box body;
the battery module is installed in the box, characterized in that, the battery module is the battery module of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010809040.6A CN114079101A (en) | 2020-08-12 | 2020-08-12 | Battery module and battery box with heating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010809040.6A CN114079101A (en) | 2020-08-12 | 2020-08-12 | Battery module and battery box with heating function |
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| Publication Number | Publication Date |
|---|---|
| CN114079101A true CN114079101A (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010809040.6A Pending CN114079101A (en) | 2020-08-12 | 2020-08-12 | Battery module and battery box with heating function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115189074A (en) * | 2022-09-09 | 2022-10-14 | 深圳海润新能源科技有限公司 | Battery module and battery pack |
-
2020
- 2020-08-12 CN CN202010809040.6A patent/CN114079101A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115189074A (en) * | 2022-09-09 | 2022-10-14 | 深圳海润新能源科技有限公司 | Battery module and battery pack |
| CN115189074B (en) * | 2022-09-09 | 2022-12-09 | 深圳海润新能源科技有限公司 | Battery module and battery pack |
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