CN213340515U

CN213340515U - Heatable battery module and battery box

Info

Publication number: CN213340515U
Application number: CN202021671484.XU
Authority: CN
Inventors: 李俊; 刘汉祥; 吴云川; 侯守林; 曹海月; 付卫东
Original assignee: Zhengzhou Shenlan Power Technology Co Ltd
Current assignee: Zhengzhou Yutong mining equipment Co.,Ltd.
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-06-01
Anticipated expiration: 2030-08-12

Abstract

The utility model relates to a battery module and battery box that can heat, the battery module that can heat includes electric core, heating film, the heating film includes the membrane body and sets up the heater strip in the membrane body, the heating film includes the weak part that extends from top to bottom, be equipped with weak structure on the said weak part; the weak part has at least two and is first weak part and second weak part respectively, weak structure on first weak part and the second weak part leans on respectively and leans on the setting down, it is comparatively even to make the heating film deformation when the heating film warp, first weak part downside size is great simultaneously, be difficult to the fracture, the same reason second weak part upside is difficult to the fracture equally, the heater strip passes from the upside of first weak part downside and second weak part, be difficult to the quilt and tear, the security of heating film has been improved, the technical problem that the potential safety hazard that the easy fracture of heater strip caused in the heating film is big among the present current battery module has been solved.

Description

Heatable battery module and battery box

Technical Field

The utility model relates to a battery module and battery box that can heat.

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.

For solving the problem that the battery box is interfered by external environment temperature and influences the operation, the heating film which can provide heat for the battery cell is added in the battery module in the battery box at present. The heating film is fixed on the side surface of the battery cell in an adhesive mode, and the heating film can transmit heat to the battery cell by self heating during power-on so as to improve the working temperature of the battery cell. But when electric core self charge-discharge, can take place corresponding thermal energy, bond the heating film on the module and can receive the alternation that the module expansive force brought and drag to as for the heating film can be elongated when receiving the alternation and dragging, when the alternation is dragged power and is greater than the bearing limit of heating film, the heating film can be broken by the stretch, and the heater strip in the heating film splits, produces the potential safety hazard. In order to solve the problem that the heating film is easy to damage under the action of alternating pulling force, the mode of perforating on the heating film is adopted at present to improve the deformability of the heating film, but after the deformation of the heating film exceeds the limit fracture, the heater strip in the heating film is still easy to break, and the technical problem of high potential safety hazard exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery module capable of heating, which solves the technical problem of large potential safety hazard caused by easy breakage of heating wires in a heating film in the existing battery module;

additionally, the utility model discloses an in addition aim at provides an use battery box of above-mentioned battery module for solve present battery box because the easy fracture of heater strip arouses the technical problem that the potential safety hazard is big in the battery module.

In order to achieve the above object, the utility model discloses the battery module that can heat adopts following technical scheme:

heatable battery module 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 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 comprises a film body and a heating wire arranged in the film body, and two wiring ends of the heating wire are positioned at the end part of the heating film;

the heating film comprises a weak part extending up and down, a weak structure is arranged on the weak part, and the weak structure is a hole or a seam penetrating through two sides of the heating film; or the weak structure is a thinning recess with the thinned thickness;

the weak part has at least two first weak part and second weak part, and the weak structure of first weak part sets up on the top, and the weak structure of second weak part sets up under, and the heater strip passes first weak part from the downside of the weak structure on first weak part, and the heater strip passes the second weak part from the upside of the weak structure on the second weak part.

Has the advantages that: weak structure on first weak portion and the second weak portion leans on respectively and leans on the setting down, it is comparatively even to make the heating film warp when the heating film warp, first weak portion downside size is great simultaneously, be difficult to the fracture, it is equally difficult to the fracture to reason second weak portion upside, the heater strip passes from the upside of first weak portion downside and second weak portion, be difficult to pulled apart, the security of heating film has been improved, the technical problem that the potential safety hazard is big that the easy fracture of heater strip caused in the heating film among the present battery module has been solved.

Further, any adjacent weak part in the cell arrangement direction satisfies: the two weak portions are a first weak portion and a second weak portion, respectively.

Has the advantages that: the first weak part and the second weak part are alternately arranged in the front-back direction, so that the deformation capacity of the heating film is further improved, meanwhile, the heating wire is not easy to break, and the safety of the heating film is further improved.

Further, weak structure on first weak portion and the second weak portion is the slot hole that extends from top to bottom, and the upside pore wall of slot hole is the down V-arrangement of opening downwards on the first weak portion, and the downside pore wall is the arc, and the downside pore wall opening of slot hole is the V-arrangement of opening upwards on the second weak portion, and the upside pore wall is the arc.

Has the advantages that: the shape of the upper side hole wall of the long hole of the first weak part guides the upper side of the first weak part to break, the shape of the lower side hole wall of the second weak part is used for guiding the lower side of the second weak part to break, the integrity of the position of the heating wire is ensured through the arc-shaped hole wall, the heating wire is not easy to break, and the safety of the heating film is improved.

Furthermore, two terminals of the heating wire are respectively arranged at the front end and the rear end of the heating film.

Has the advantages that: the wiring of the wiring end of the heating wire is convenient.

Furthermore, the heating films are arranged on the left side surface and the right side surface of the electric core group, and heating wires in the heating films on the left side surface and the right side surface of the electric core group are connected in series.

Has the advantages that: the heating wires connected in series can share a power supply, and the wiring mode is simplified.

Furthermore, the heating film is fixedly bonded with the electric core group, at least one of the front end and the rear end of the heating film is a movable end, the front end and the rear end of the electric core group are provided with end plates, the front end and the rear end of the heating film are respectively connected to the two end plates through connecting pieces, each connecting piece is provided with a stop structure for limiting the end part of the heating film to move towards the direction far away from the electric core group, and the 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 front end and the rear end of the heating film are connected to the two end plates through the connecting pieces respectively, the blocking structure on the connecting pieces can prevent the movable end from warping, and the fixing effect of the heating film is improved.

Furthermore, the movable end is provided with the long hole, a 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 a 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: even joint spare is easy to assemble, and can guarantee the stability of movable end with movable end pressure on the end plate.

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 stiff end connection end plate, all is equipped with the locating hole with the connecting piece location on stiff end connection end plate and the heating film.

Has the advantages that: during installation, the heating film is positioned and fixed through the positioning and fixing end, so that the heating film is convenient to install.

The utility model discloses technical scheme of battery box:

the battery box comprises a box body and a battery module;

the battery module is installed in the box, includes:

Drawings

Fig. 1 is a schematic structural diagram of an embodiment 1 of a battery module capable of heating in the present invention;

fig. 2 is a schematic view of an installation structure of a movable end connecting end plate and a heating film of embodiment 1 of a battery module capable of heating according to the present invention;

fig. 3 is a schematic structural view of the relative position of the heating film in embodiment 1 of the battery module capable of heating according to the present invention;

fig. 4 is a schematic structural view of a heating film of embodiment 1 of a battery module capable of heating in the present invention at a cell stacking position;

fig. 5 is a schematic structural view of a heating film in embodiment 1 of the battery module capable of heating according to the present invention;

fig. 6 is a sectional view of a heating film and a movable end connecting end plate in embodiment 1 of the battery module capable of heating according to the present invention;

fig. 7 is a schematic structural view of the relative position of the heating film in embodiment 2 of the battery module capable of heating according to the present invention;

fig. 8 is a schematic structural view of the relative position of the heating film in embodiment 3 of the battery module capable of heating 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; 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-a weak portion; 361-a first weak portion; 362-second weak portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail 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 portion of the invention and are not intended to be all embodiments. The components of particular embodiments of the present invention, as generally described and illustrated in the figures herein, may 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 accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the specific embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present 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 box and the battery module thereof according to the present invention will be described in detail with reference to the following embodiments.

The utility model discloses can the battery module of heating embodiment 1: 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 a front-back direction, the heating film 30 includes a film body and a heating wire (not shown) fixed in the film body, two terminals 33 of the heating wire are respectively located at front and back ends of the heating film, 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.

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.

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.

Meanwhile, there is a gap between the stack position of the weak part 36 of the heating film 30 and the battery core 10, so that the deformation of the heating film at the position can be facilitated, glue injection into the gap is not needed when the battery module is assembled, and the processing efficiency can be improved. In other embodiments, adhesive may also be injected into the recessed space.

Each of the unloading holes 31 is provided at a position where the corresponding adjacent battery cells 10 are stacked, the unloading holes 31 are alternately arranged one above the other in the front-rear direction in adjacent weak portions 36 on the same heating film 30, the weak portions 36 are divided into first weak portions and second weak portions, the unloading holes 31 of the first weak portions are provided above, the unloading holes 31 of the second weak portions are provided below, and one of any two adjacent weak portions is a first weak portion, and the other is a second weak portion.

The unloading hole 31 in the first weak portion extends upward from the middle of the heating film 30, the unloading hole 31 being disposed upward, the unloading hole 31 in the second weak portion extends downward from the middle of the heating film 30, and the unloading hole 31 being disposed 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.

As shown in fig. 5, in the present embodiment, the area inside the dotted line is a heater wire routing area, and the heater wire passes through the first weak portion from the lower side of the unloading hole 31 on the first weak portion and passes through the second weak portion from the upper side of the unloading hole 31 on the second weak portion. After the heating film is tensioned and deformed, the lower side of the unloading hole of the first weak part and the upper side of the unloading hole of the second weak part have high strength and are not easy to be torn off, so that the heating wire is not easy to be torn off, and the safety of the heating wire can be ensured. In this embodiment, the unloading hole 31 is an oblong hole, and when the heating film is deformed by pulling, 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.

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 hole 31 of the left heating film 30 extends downward from the middle of the heating film 30, the unloading hole 31 of the right heating film 30 extends upward from the middle of the heating film 30, and the other is that the unloading hole of the left heating film 30 extends upward from the middle of the heating film 30, and the unloading hole of the right heating film 30 extends downward from the middle of the heating film 30, so that the two heating films on the left and right sides are centrosymmetric, and the two heating films are stressed more uniformly.

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, to facilitate installation. The movable end 342 is pressed on the movable end connecting end plate 201 after the buckle 22 is installed, and a certain pressure exists between the movable end and the movable end connecting end plate, but after the battery cell expands, the movable end and the movable end connecting end plate are subjected to module expansion force along the front-back direction, and when the acting force is larger than the acting force of the maximum static friction force between the movable end and the movable end connecting end plate, the movable end and the movable end connecting end plate can move relatively along the front-back direction.

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 fixed end is connected with the round holes on the end plate and the heating film to form a positioning hole positioned by the buckle.

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.

The end of the fixing screw 222 is provided with a blocking cap 223, the side surface of the blocking cap 223 facing the heating film 30 is in blocking fit with the heating film 30, and the heating film 30 is limited from moving in the direction away from the battery cell 10, and 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 this embodiment constitutes a connecting piece connecting the front end and the rear end of the heating film and the corresponding end plate, and the stop cap constitutes a stop structure limiting the movement of the end part of the heating film to the direction far away from the electric core group.

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.

The utility model discloses can the battery module of heating embodiment 2: 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.

The utility model discloses can the battery module of heating embodiment 3: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: as shown in fig. 8, the upper hole wall of the unloading hole 31 of the first weak portion 361 in this embodiment is in an inverted V shape with a downward opening, and the lower hole wall is in an arc shape, so that when the heating film reaches the tensile limit, the portion of the first weak portion above the unloading hole 31 is torn first. The opening of the lower side hole wall of the unloading hole 31 on the second weak part 362 is in a V shape with an upward opening, the upper side hole wall is in an arc shape, and when the heating film reaches the tensile limit, the part of the second weak part, which is positioned at the lower side of the unloading hole, is firstly torn, so that the safety of the heating wire is ensured. In other embodiments, a circular hole may be provided at one end of the relief slit to guide the tearing direction of the weak portion, similarly to the embodiment 5.

The utility model discloses can the battery module of heating embodiment 4: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in the present embodiment, the first weak portions and the second weak portions are each provided in pairs, two first weak portions are adjacent to each other to form a first weak portion pair, two second weak portions are adjacent to each other to form a second weak portion pair, and the first weak portion pair and the second weak portion pair are alternately arranged in the front-rear direction. In other embodiments, the first weak portion and the second weak portion on the heating film may not be regular, and only the first weak portion and the second weak portion on the heating film need to be satisfied.

The utility model discloses can the battery module of heating concrete embodiment 5, the structure of the battery module in this embodiment only lies in with above-mentioned concrete embodiment's difference: in this embodiment, the movable end connecting 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 it is satisfied that the movable end and the movable end connection end plate can move relatively in the front-rear direction.

The utility model discloses can the battery module of heating concrete embodiment 6, the structure of the battery module in this embodiment only lies in with above-mentioned concrete embodiment's difference: the connecting piece in the embodiment is a connecting stud welded and fixed with the movable end connecting 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.

The utility model discloses can the battery module of heating embodiment 7: 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.

The utility model discloses can the battery module of heating embodiment 8: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the unloading hole is not set up to the butt joint position of the two battery cores, and the unloading hole can be normally used even if deviating from the butt joint position of the two battery cores by a certain distance.

The utility model discloses can the battery module of heating embodiment 9: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: the two terminals of the heating wire are positioned at the same end of the heating film.

The utility model discloses can the battery module's of heating concrete embodiment 10: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the shape of the unloading hole is a square hole, the edge of the square hole has a sharp corner, and when the heating film is stretched by the alternating expansion force, the heating film may be torn at the sharp corner, so that the length of the heating film is increased, and the heating film can adapt to the electric core group which is increased by thermal expansion.

The utility model discloses can the battery module's of heating concrete embodiment 11: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the heating film is provided with a plurality of weak portions along the length direction, wherein two adjacent weak portions are a pair, the unloading holes in one pair of the weak portions are arranged above, and the unloading holes in the other pair of the weak portions adjacent to the pair of the weak portions are arranged below, so that the unloading holes are arranged on the heating film on the side surface of the cell, and at least one pair of the weak portions adjacent to each other in the cell arrangement direction satisfies: 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.

The utility model discloses can the battery module of heating embodiment 12: 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 provided with a long hole extending forward and backward as a locking hole.

The utility model discloses can the battery module's of heating concrete embodiment 13: 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 movable end 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.

The utility model discloses can the battery module's of heating concrete embodiment 14: the structure of the battery module in this embodiment is different from the above-described embodiment only in that: in this embodiment, the heating wires on the two heating films are connected in parallel.

The utility model discloses the concrete embodiment of well battery box: the battery box includes the box, has arranged two at least battery modules in the box, and the structure of battery module is the same with the battery module in the above-mentioned battery module embodiment, consequently about the utility model discloses the concrete embodiment of well battery box is repeated description no longer.

The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. Heatable battery module includes:

it is characterized in that the preparation method is characterized in that,

2. The heatable battery module as claimed in claim 1, wherein any adjacent weak part in the cell arrangement direction satisfies: the two weak portions are a first weak portion and a second weak portion, respectively.

3. The heatable battery module of claim 2, wherein the weak structures of the first weak portion and the second weak portion are elongated holes extending in the vertical direction, the upper side hole wall of the elongated hole of the first weak portion is formed in an inverted V-shape with a downward opening, the lower side hole wall is formed in an arc shape, the lower side hole wall of the elongated hole of the second weak portion is formed in a V-shape with an upward opening, and the upper side hole wall is formed in an arc shape.

4. The heatable battery module according to claim 1, 2 or 3, wherein the two terminals of the heater wire are located at the front and rear ends of the heater film, respectively.

5. The heatable battery module as claimed in claim 4, wherein the heating films are disposed on both left and right sides of the electric core pack, and the heating wires are connected in series in the heating films on the left and right sides of the electric core pack.

6. The heatable battery module according to claim 1, 2 or 3, wherein the heating film is fixedly bonded to the electric core pack, at least one of the front and rear ends of the heating film is a movable end, the front and rear ends of the electric core pack are provided with end plates, the front and rear ends of the heating film are respectively connected to the two end plates through connecting pieces, each connecting piece has a stop structure for limiting the end of the heating film to move away from the electric core pack, and the end plate connected to the movable end is a movable end connection end plate;

7. The heatable battery module of claim 6, wherein the movable end is provided with the elongated hole, and the connecting member connected to the movable end connection end plate is used to press the movable end against the movable end connection end plate, the movable end and movable end connection end plate being relatively moved in the front-rear direction when subjected to a module expansion force that drives the relative movement in the front-rear direction greater than a maximum static friction force therebetween.

8. The heatable battery module as set forth in claim 6, wherein the heating film has a positioning fixing end at one end thereof, the end plate connected to the positioning fixing end is a fixing end connecting end plate, the positioning fixing end is fixed to the fixing end connecting end plate via a connecting member, and positioning holes for positioning the connecting member are formed in both the fixing end connecting end plate and the heating film.

9. A battery case, comprising:

a box body;

the battery module is installed in a box body, and is characterized in that the battery module is the heatable battery module as claimed in any one of claims 1-8.