CN113451697B

CN113451697B - Battery pack

Info

Publication number: CN113451697B
Application number: CN202111000776.XA
Authority: CN
Inventors: 曹新成; 田瑞生
Original assignee: CALB Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2021-11-19
Anticipated expiration: 2041-08-30
Also published as: CN113451697A

Abstract

The invention discloses a battery pack, which is characterized in that a reinforcing piece and a heating film are arranged between a battery and a bottom plate of a box body, and the heating film is arranged between the reinforcing piece and the bottom plate, so that the reinforcing piece can protect the heating film, the battery pack is prevented from damaging the heating film, and the heating film can be ensured to work normally; meanwhile, the heating film is arranged, so that the active heat preservation of the battery pack can be realized, the low-temperature application performance of the battery pack is improved, and the application scene of the battery pack is expanded; and, the reinforcement can have better roughness, and then can guarantee the roughness of heating film to and the bonding strength with the reinforcement, avoid the problem that the heating film appears droing or shifting to appear, and then avoid appearing dry combustion method, avoid the battery package to appear thermal runaway, thereby improve the reliability and the security of battery package.

Description

Battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack.

Background

The battery pack may generally include: the box and be located the group battery in the box, wherein the group battery is different with the battery module, and the battery module includes the framework and is located the battery in the framework, and the group battery then does not include the framework, so the bottom plate of group battery and box need bond through gluing. However, since the battery pack is adhered to the bottom plate by the adhesive and the battery pack does not include the frame, when the heating film is disposed, if the heating film is disposed between the battery pack and the bottom plate, the weight of the battery pack may damage the heating film, and the heating film may not work normally.

Therefore, for the battery pack including the battery pack, how to set the heating film to avoid damaging the heating film and ensure that the heating film can normally work is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a battery pack which is used for setting a heating film so as to avoid damage to the heating film and ensure that the heating film can work normally.

An embodiment of the present invention provides a battery pack, including: the battery pack comprises a box body, a battery pack, a reinforcing piece and a heating film;

the battery pack, the reinforcing member and the heating film are stacked in the box body in the order from top to bottom;

the reinforcement and the heating film are disposed between the battery pack and the bottom plate of the case.

The reinforcing piece and the heating film are arranged between the battery and the bottom plate of the box body, and the heating film is arranged between the reinforcing piece and the bottom plate, so that the reinforcing piece can protect the heating film, the battery pack is prevented from damaging the heating film, and the heating film can be ensured to work normally; meanwhile, the heating film is arranged, so that the active heat preservation of the battery pack can be realized, the low-temperature application performance of the battery pack is improved, and the application scene of the battery pack is expanded; and, the reinforcement can have better roughness, and then can guarantee the roughness of heating film to and the bonding strength with the reinforcement, avoid the problem that the heating film appears droing or shifting to appear, and then avoid appearing dry combustion method, avoid the battery package to appear thermal runaway, thereby improve the reliability and the security of battery package.

Optionally, in an embodiment of the present invention, the reinforcing member has a first surface facing a side of the battery pack;

the reinforcement further includes: the first groove is formed in the first surface, glue is arranged in the first groove, and the reinforcing piece is bonded with the battery pack through the glue.

So, through setting up first recess, and will glue the setting in first recess, can set up more glue between reinforcement and group battery, and then improve the bonding strength between reinforcement and the group battery, play better fixed action to the group battery.

And, to glue the setting in first recess, can avoid gluing and spill over outside group battery and the reinforcement when reinforcement and group battery bond, and then avoid causing harmful effects to other structures, reduced the clear process of gluing simultaneously to when improving the reliability of battery package, simplified the manufacture craft, reduced the cost of manufacture.

Optionally, in an embodiment of the present invention, the stiffener has a second surface facing a side of the heating film;

the reinforcement further includes: the first protrusion is arranged on the second surface and corresponds to the first groove.

So, set up first recess and first arch through corresponding, can be favorable to increasing the intensity of reinforcement, avoid the reinforcement to warp to can play the guard action to the heating film, avoid the heating film to receive the damage, can also effectively reduce the thick end of reinforcement and reach material saving's purpose, improve the energy density of battery package.

Optionally, in the embodiment of the present invention, the battery pack is provided with a plurality of battery packs, the first grooves are provided with a plurality of first grooves, and the first grooves and the battery packs are arranged in a one-to-one correspondence manner;

the heating film is provided with a plurality of, the heating film set up in first arch, just the heating film with first arch one-to-one sets up.

So, make every heating film can heat corresponding group battery to improve the precision of heating, can also do benefit to simultaneously and avoid thermal waste, reduce the cost of heating the membrane.

Optionally, in an embodiment of the present invention, a side surface of the base plate facing the heating film has a second recess, and the second recess accommodates the first protrusion and the heating film.

So, can occupy the inner space of battery package because of first bellied setting, and the heating film sets up between first arch and box bottom plate, probably extrudees the heating film, consequently, the second recess holds first arch and heating film, can avoid the heating film to extrude, improves the reliability and the security performance of heating film.

Optionally, in an embodiment of the present invention, a side surface of the bottom plate facing away from the heating film has a second protrusion, and the second groove is disposed corresponding to the second protrusion.

So, be favorable to improving the intensity of bottom plate, avoid the bottom plate to take place deformation, and then improve better supporting role to the structure of battery package inside, effectively protect the structure in the battery package.

Optionally, in the embodiment of the present invention, a plurality of first protrusions are provided, a plurality of second grooves are provided, and the first protrusions and the second grooves are provided in a one-to-one correspondence.

So, can be so that group battery, reinforcement and heating film can fix at the bottom plate well, avoid taking place to shift in the use, and then avoid causing the harm to group battery and heating film to improve the reliability and the security of battery package.

Optionally, in an embodiment of the present invention, the reinforcement and the bottom plate are connected by a clinch rivet.

Therefore, the reinforcing piece and the bottom plate are connected through the lock riveting rivet, so that the connection quality can be effectively improved, meanwhile, the battery pack can be effectively fixed, and the reliability of the battery pack is improved.

Optionally, in an embodiment of the present invention, the locking rivet is disposed around the heating film.

So, can effectively fix reinforcement and bottom plate, avoid the reinforcement to take place to shift, and then avoid group battery and heating film etc. to take place to shift, avoid causing the influence to other structures in the battery package simultaneously to improve the reliability of battery package.

Optionally, in an embodiment of the present invention, the heating film includes a connection line for transmitting an electrical signal;

the edge of reinforcement is provided with dodges the hole, the connecting wire passes dodge the hole.

In this manner, the connection wires are easily extended out of the reinforcement member, and are easily connected to other structures (such as, but not limited to, a temperature control structure) to provide energy (e.g., electrical energy) to the heating film so that the heating film can heat the corresponding battery pack.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic sectional view specifically enlarged in part of the structure in a plane direction formed parallel to the direction F1 and the direction F2 in fig. 1;

fig. 3 is another cross-sectional view specifically enlarged in part of the structure in a plane direction formed parallel to the direction F1 and the direction F2 in fig. 1;

fig. 4 is a further enlarged schematic sectional view of a part of the structure in a plane direction formed parallel to the direction F1 and the direction F2 in fig. 1;

FIG. 5 is an enlarged schematic structural view of a rivet according to an embodiment of the present invention;

FIG. 6 is a schematic view of a distribution of rivet locks provided in an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an avoiding hole provided in the embodiment of the present invention.

10-box, 11-bottom plate, 11 a-second groove, 11B-second protrusion, 20-battery, 20 a-battery bottom, 30-reinforcing piece, 31-first groove, 32-first protrusion, 33-avoiding hole, 40-heating film, 41-connecting wire, 50-glue, 60-rivet, B1-first surface, B2-second surface.

Detailed Description

A specific embodiment of a battery pack according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The inventors have found in their studies that, in a battery pack including a battery pack, since the battery pack does not include end plates and side plates (which may constitute a frame for accommodating batteries), it is necessary to bond the battery pack to a bottom plate of a case of the battery pack so as to facilitate fixing of the battery pack.

When the heating film is arranged, the battery pack and the bottom plate are bonded through the structural adhesive, and the heating film cannot bear the weight of the battery pack, so that the heating film cannot be arranged between the battery pack and the bottom plate; in order to solve this problem, a heating film may be provided at a side of the battery pack and bonded to the battery pack by a structural adhesive, and in order to heat uniformly, heating films may be provided at both opposite sides of the battery pack.

So, not only make the use quantity of heating film increase, increased the cost of manufacture of battery package, when the battery takes place the inflation, the heating film that is located the side probably takes place to shift or drop because of the expansive force for there is the hole between heating film and the group battery, if the heating film heats this moment, the problem of dry combustion method can appear, leads to battery thermal runaway, finally leads to the security greatly reduced of battery package.

Therefore, the embodiment of the invention provides a battery pack, which is used for improving the safety and the reliability of the battery pack while avoiding the increase of the manufacturing cost of the battery pack.

Specifically, a battery pack provided in an embodiment of the present invention, as shown in fig. 1, may include: the case 10, the battery pack 20, the reinforcement 30, and the heating film 40;

the battery pack 20, the reinforcing member 30, and the heating film 40 are stacked in the case 10 in this order from the top down;

the reinforcement 30 and the heating film 40 are both disposed between the battery pack 20 and the bottom plate 11 of the case 10.

In fig. 1, the number of heating films 40 and the number of battery packs 20 are not limited to three, and may be two, four, five, or the like, and may be provided according to actual needs.

To illustrate, three battery packs 20 are shown in fig. 1, wherein the three battery packs 20 are arranged in the direction F1; each battery pack 20 includes a plurality of unit cells, and for any battery pack 20, the plurality of unit cells are arranged along the direction F3.

So, through setting up reinforcement and heating film between battery and bottom plate, and the heating film setting is between reinforcement and bottom plate for the reinforcement can play the guard action to the heating film, avoids the battery group to cause the damage to the heating film, and then can guarantee that the heating film can normally work, can have better heating effect to the battery package heating through the bottom simultaneously.

Meanwhile, the active heat preservation of the battery pack can be realized by arranging the heating film, the low-temperature application performance of the battery pack is improved, and the application scene of the battery pack is expanded.

And, the reinforcement can have better roughness, and then can guarantee the roughness of heating film to and the bonding strength with the reinforcement, avoid the problem that the heating film appears droing or shifting to appear, and then avoid appearing dry combustion method, avoid the battery package to appear thermal runaway, thereby improve the reliability and the security of battery package.

Alternatively, in the embodiment of the invention, as shown in fig. 2, the reinforcing member 30 has a first surface B1 facing the side of the battery pack 20;

the reinforcement 30 further includes: the first groove 31 is provided at the first surface B1, the glue 50 is provided in the first groove 31, and the reinforcing member 30 is bonded to the battery pack 20 by the glue 50.

Wherein in fig. 2 the first surface B1 is shown provided with three first grooves 31, and counting from left to right, glue 50 is shown in the first two first grooves 31, and no glue 50 is shown in the rightmost first groove 31, but this does not mean that no glue 50 is provided in the rightmost first groove 31, here only for the sake of clarity of the first grooves 31, in practice glue 50 is provided in each first groove 31.

To illustrate, only one of the sides of the battery pack 20 is shown in fig. 2, and only a part of the heights of the three battery packs in the direction F2 is shown in the drawing; similarly, fig. 3 and 4, referred to later, also show the partial height of the three battery packs in the direction F2.

Specifically, in the embodiment of the present invention, the kinds of glue may include, but are not limited to: the structural adhesive, the heat-conducting gel, the heat-conducting structural adhesive, and the like can be arranged according to actual needs, and are not limited herein.

Based on the first groove provided on the first surface of the stiffener, the following arrangement may also be made:

case 1:

alternatively, in the embodiment of the present invention, as shown in fig. 3, the reinforcement 30 has a second surface B2 facing the side of the heating film 40;

the reinforcement 30 further includes: the first protrusion 32 is disposed on the second surface B2, and the first protrusion 32 is disposed corresponding to the first groove 31.

Specifically, when one first groove and one first protrusion are arranged, the first groove and the first protrusion are correspondingly arranged; or when the first groove and the first protrusion are both provided with a plurality of protrusions, the first groove and the first protrusion are arranged in a one-to-one correspondence manner, and the number of the first groove and the number of the first protrusion are the same.

Of course, optionally, one first protrusion may also be disposed corresponding to a plurality of first grooves (not shown), or one first groove may be disposed corresponding to a plurality of first protrusions (not shown), so as to improve flexibility of design, meet requirements of different application scenarios, and specifically may be performed according to actual requirements, which is not limited herein.

Specifically, the first protrusion may be integrated with the reinforcement, and at this time, the first groove and the first protrusion that are correspondingly disposed may be formed by a stamping method, which is simple in process and easy to implement, and may also be formed by other process methods, and no limitation is made herein.

Specifically, on the basis that the second surface of the reinforcing member is provided with the first protrusions, other arrangements will be described below.

Firstly, when the number of the first grooves and the heating film are arranged, the following modes can be included:

mode 1:

optionally, in the embodiment of the present invention, one first groove is provided, and the first groove is provided corresponding to all battery packs, which is not shown in the drawings.

At this time, the first protrusion may be provided with one.

So, first recess and first bellied quantity that sets up in the reinforcement that can significantly reduce, and then simplify the preparation degree of difficulty of reinforcement greatly, can also increase the intensity of reinforcement to a certain extent simultaneously.

Further, in the embodiment of the present invention, when the heating film is provided, only one heating film may be provided, and the heating film may be provided to the first protrusion.

So, can heat all group batteries through a heating film, reduce the quantity that sets up of heating film, simplify the preparation degree of difficulty of battery package simultaneously.

Alternatively, the heating film may be provided in plurality, each of the heating films being provided to the first protrusion, and each of the heating films corresponding to at least one battery pack.

So, make every heating film can heat partial cell group to improve the precision of heating, can also do benefit to simultaneously and avoid thermal waste, reduce the cost of heating the membrane.

Preferably, the heating film corresponds to each battery pack one by one, and further, the area of the surface of the heating film facing the side of the reinforcing member may be the same as the area of the bottom of the battery pack (i.e., the orthographic projection of the bottom of the battery pack on the heating film completely overlaps with the heating film).

Thus, the heating efficiency of the heating film can be improved, and the waste of heat can be avoided.

When the heating device is specifically implemented, the heating film can be set according to actual needs, so that the flexibility of design is improved, and the requirements of different application scenes are met.

Mode 2:

optionally, in the embodiment of the present invention, a plurality of first grooves are provided, and the number of the first grooves is less than the number of the battery packs, and each first groove is provided corresponding to a part of the battery packs, which is not shown in the drawing.

To illustrate, alternatively, some of the battery packs mentioned herein may be: one battery, two batteries, three batteries, or other number of batteries, but not all batteries; moreover, the number of the battery packs corresponding to different first grooves may be different or the same.

So, can reduce first recess and the first bellied quantity that sets up in the reinforcement to a certain extent, and then simplify the preparation degree of difficulty of reinforcement, simultaneously can also greatly increased the intensity of reinforcement.

Further, in the embodiment of the present invention, when the heating film is provided, the arrangement in the above-described mode 1 may be adopted, and details thereof will not be described.

Mode 3:

optionally, in the embodiment of the present invention, the first grooves 31 are provided in plural, and the number of the first grooves 31 is equal to the number of the battery packs 20, and each first groove 31 is provided corresponding to one battery pack 20, that is: the first grooves 31 are provided in one-to-one correspondence with the battery packs 20, as shown in fig. 3.

So, can effectively increase the intensity of reinforcement, can also avoid simultaneously gluing to spill over the region outside the group battery, avoid causing harmful effects to the region outside the group battery to improve the reliability of battery package.

Further, in the embodiment of the present invention, a plurality of heating films 40 are disposed, the heating films 40 are disposed on the first protrusions 32, and the heating films 40 are disposed in one-to-one correspondence with the first protrusions 32, as shown in fig. 3.

Namely: the heating films 40 are disposed in one-to-one correspondence with the battery packs 20, so that each heating film 40 can heat only the correspondingly disposed battery pack 20.

And, when the area of the first groove and the first protrusion is the same (i.e. the orthographic projection of the first groove on the first protrusion completely overlaps the first protrusion), and the area of the first groove is greater than or equal to the area of the bottom of the battery pack (i.e. the orthographic projection of the bottom of the battery pack on the first groove is located in the first groove), the area of the surface of the heating film on the side facing the stiffener may be the same as the area of the bottom of the battery pack (i.e. the orthographic projection of the bottom of the battery pack on the heating film completely overlaps the heating film) (as shown in fig. 3, in which only one side of the battery pack 20 and one side of the heating film 40 are shown in fig. 3, the area of the bottom of the battery pack 20 is represented by the same area of the surface of the heating film 40 on the side facing the stiffener 30), or the area of the surface of the heating film on the side facing the stiffener may be greater than the area of the bottom of the battery pack (i.e. the heating film is greater than the orthographic projection of the bottom of the battery pack on the heating film), so that the heating film effectively heats the battery pack.

That is, the areas of the first groove, the first protrusion, and the heating film may be set according to actual needs, and are not limited herein.

Of course, alternatively, in the embodiment of the present invention, when the heating film is provided, only one heating film may be provided, and the heating film may heat all the battery packs.

It should be noted that, since a plurality of first protrusions are provided, when one heating film is provided, a part of the heating film may be located on the first protrusions, and a part of the heating film is not located on the first protrusions, which is not shown in the figure.

Therefore, only one heating film needs to be bonded on the reinforcing part, and a plurality of heating films do not need to be bonded, so that the manufacturing process becomes simple and easy to operate, and the manufacturing process of the battery pack is simplified.

Secondly, the bottom plate is arranged as follows:

alternatively, in the embodiment of the present invention, as shown in fig. 3 and 4, a side surface of the base plate 11 facing the heating film 40 has a second recess 11a, and the second recess 11a receives the first protrusion 32 and the heating film 40.

Wherein the depth S1 of the second groove may be equal to the sum of the height S2 of the first protrusion and the thickness of the heating film S3, as shown in fig. 3; alternatively, the depth of the second groove may be greater than the sum of the height of the first protrusion and the thickness of the heating film, which is not shown; still alternatively, the depth of the second groove may be smaller than the sum of the height of the first protrusion and the thickness of the heating film, which is not shown; the specific setting can be carried out according to actual needs, and is not limited herein.

Specifically, in the embodiment of the present invention, as to the number of the second grooves, the following may be included:

one second groove is provided, and the second groove accommodates all the first protrusions and all the heating films, which are not shown;

alternatively, each heating film is disposed on a plurality of first protrusions (i.e., the heating film and the first protrusions may be in a one-to-many relationship), and the heating film and the corresponding first protrusions form a protrusion combination (not shown), or each first protrusion is provided with one heating film thereon (i.e., the heating film and the first protrusions are in a one-to-one relationship), and each first protrusion and the corresponding heating film form a protrusion combination (as shown in fig. 4), a plurality of second grooves are provided, and each second groove accommodates at least one protrusion combination (including that each second groove accommodates one protrusion combination, and at this time, the second groove and the first protrusion are in one-to-one correspondence), or each second groove accommodates a plurality of protrusion combinations, and at this time, the second groove and the first protrusion are in a one-to-many relationship).

Moreover, the battery pack, the reinforcing piece and the heating film can be well fixed on the bottom plate, the displacement in the use process is avoided, the damage to the battery pack and the heating film is further avoided, and therefore the reliability and the safety of the battery pack are improved.

Certainly, when the method is implemented specifically, the number of the second grooves can be set according to actual needs, so that the flexibility of design is improved, and the requirements of different application scenes are met.

Alternatively, in the embodiment of the present invention, as shown in fig. 4, a surface of the bottom plate 11 facing away from the heating film 40 has a second protrusion 11b, and the second groove 11a is disposed corresponding to the second protrusion 11 b.

Specifically, when one second groove and one second protrusion are arranged, the second groove and the second protrusion are correspondingly arranged; or when the second grooves and the second bulges are arranged in a plurality of numbers, the second grooves and the second bulges are arranged in a one-to-one correspondence mode, and the number of the second grooves and the number of the second bulges are the same.

That is to say, when second recess and the protruding one-to-one of second set up, can form through the punching press mode to in the intensity of improvement bottom plate, avoid warping, and then improve better supporting role to the inside structure of battery package, effectively protect the structure in the battery package.

Of course, optionally, one second protrusion may also be disposed corresponding to a plurality of second grooves (not shown), or one second groove may be disposed corresponding to a plurality of second protrusions (not shown), so as to improve flexibility of design, meet requirements of different application scenarios, and specifically may be performed according to actual requirements, which is not limited herein.

Further, alternatively, as shown in fig. 3, a side surface of the base plate 11 facing away from the heating film 40 may also be provided as a flat surface, i.e., without the second protrusion.

Therefore, the thickness increase of the battery pack can be avoided, the size of the battery pack is reduced, the miniaturization setting is facilitated, and the application range and the application field are improved.

Case 2:

alternatively, in the embodiment of the present invention, as shown in fig. 2, the second surface B2 of the reinforcement 30 is provided as a flat surface, i.e., without the first protrusion.

Therefore, the thickness of the battery pack can be favorably prevented from being increased, the size of the battery pack is favorably reduced, the miniaturization setting is favorably realized, and the application range and the application field are improved.

On the basis, for the arrangement of the heating film, the battery pack and the bottom plate, any combination can be performed based on the arrangement number of the first grooves, the arrangement number of the heating film, the corresponding arrangement relationship between the battery pack and the first grooves, and the second grooves and the second protrusions of the bottom plate, which can be specifically referred to the embodiment in case 1 above and will not be described in detail herein.

In a word, to the setting of first recess, first arch, heating film, second recess and second arch, can set up according to actual need to improve the flexibility of design, satisfy the needs of different application scenarios.

Alternatively, in the embodiment of the present invention, as shown in fig. 5, the reinforcing member 30 is connected to the base plate 11 by the clinch rivet 60.

Wherein, lock rivet under the exogenic action, can be through piercing through the reinforcement, and flow and extend at the bottom plate of box, form a rivet connection structure of the permanent plastic deformation who inlays each other, this structure has higher tensile strength and shear strength, and riveting rivet surface has better surface quality, when improving reinforcement and bottom plate joint strength, can also guarantee the roughness on reinforcement surface, be favorable to the assembly of group battery, and the junction can also have waterproof nature and better gas tightness.

Alternatively, in the embodiment of the present invention, as shown in fig. 6, the rivet locking rivet 60 is disposed around the heating film 40.

As shown in fig. 6, three heating films 40 are shown, but this does not mean that the battery pack includes only these three heating films 40, and here, only three heating films 40 are taken as an example for description, and in actual cases, the number of heating films 40 to be provided is required to be set according to the battery pack, and is not limited herein.

As shown in fig. 6, the periphery of each heating film 40 is provided with the rivet locking rivets 60, and the number of the rivet locking rivets 60 arranged around each heating film 40 may be the same, but may also be different, and may be set according to factors such as actual needs, manufacturing cost, and process requirements, and the like, which is not limited herein.

Specifically, in the embodiment of the present invention, the clinch rivet may be provided in a region other than the first projection in the reinforcement.

For example, in the case where a plurality of first protrusions are provided, a plurality of heating films are provided, and the heating films and the first protrusions are provided in one-to-one correspondence, the rivet-locking rivet may be provided around each first protrusion.

Alternatively, in the embodiment of the present invention, as shown in fig. 7, the heating film 40 includes a connection line 41 for transmitting an electrical signal;

the edge of the reinforcement 30 is provided with a relief hole 33, and the connection line 41 passes through the relief hole 33.

The arrangement structure of the avoidance hole 33 is not limited to that shown in fig. 7, as long as the connection line 41 can be led out, and the specific arrangement structure of the avoidance hole 33 is not specifically limited herein.

Optionally, in the embodiment of the present invention, the reinforcing member may be made of a high-strength metal plate material such as steel, aluminum alloy, or the like, so that the reinforcing member has good strength and flatness, and further, the subsequent heating film is convenient to be disposed.

Alternatively, in the embodiment of the present invention, the specific implementation structure of the heating film may adopt any structure known to those skilled in the art that can implement a heating function, and is not limited herein.

Optionally, in the embodiment of the present invention, the box body may be made of, but not limited to, a metal plate or an aluminum profile, so that the box body has a better strength, and further, the structure inside the battery pack is effectively protected.

Optionally, in the embodiment of the present invention, in addition to the above-described structure, the battery pack may further include other structures, such as, but not limited to, bus bars, wiring board, flexible circuit board, and liquid cooling board, which may be specifically configured according to actual needs and will not be described in detail herein.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A battery pack, comprising: the battery pack comprises a box body, a battery pack, a reinforcing piece and a heating film;

the reinforcing member and the heating film are disposed between the battery pack and a bottom plate of the case;

the reinforcing member has a first surface facing a side of the battery pack; the reinforcement further includes: the first groove is formed in the first surface, glue is arranged in the first groove, and the reinforcing piece is bonded with the battery pack through the glue;

the stiffener has a second surface facing a side of the heating film; the reinforcement further includes: the first protrusion is arranged on the second surface and corresponds to the first groove;

wherein the first groove, the first protrusion and the reinforcing member are of an integral structure.

2. The battery pack according to claim 1, wherein the battery pack is provided in plurality, the first grooves are provided in plurality, and the first grooves are provided in one-to-one correspondence with the battery packs;

3. The battery pack according to claim 2, wherein a side surface of the base plate facing the heating film has a second recess that receives the first protrusion and the heating film.

4. The battery pack according to claim 3, wherein a surface of the bottom plate facing away from the heating film has a second protrusion, and the second groove is provided corresponding to the second protrusion.

5. The battery pack according to claim 4, wherein the first protrusions are provided in plurality, the second grooves are provided in plurality, and the first protrusions and the second grooves are provided in one-to-one correspondence.

6. The battery pack of claim 1, wherein the reinforcement member is connected to the base plate by a clinch rivet.

7. The battery pack according to claim 6, wherein the rivet locking rivet is provided around each of the heating films.

8. The battery pack according to claim 1, wherein the heating film includes a connection line for transmitting an electrical signal;