CN221327952U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses a battery pack. The battery pack comprises a battery module and a heat exchange piece, wherein the battery module comprises at least one row of battery packs, and each row of battery packs comprises a plurality of electric cores; the heat exchange piece comprises a heat exchange main body and a plurality of protection bulges, each protection bulge is connected with the heat exchange main body, and a space is reserved between two adjacent protection bulges; the heat exchange piece is attached to one surface of the battery module, and all the protection bulges are back to the battery module and extend in a direction away from the battery module. When the battery pack is impacted at the bottom or any part of the battery pack, the protection bulge is bent and deformed before the heat exchange main body and absorbs impact energy, so that the deformation of the heat exchange main body and the battery cell is reduced, the effects of buffering and protecting the battery cell are achieved, and the safety performance of the battery pack is effectively improved; and secondly, the protective bulge has the advantages of light structural form, low cost and low energy consumption of the whole automobile, and the cruising of the electric automobile is ensured.

Description

Battery pack

Technical Field

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

Background

The battery pack is used as a core component of the new energy automobile, the safety problem of the battery pack is critical to driving safety, and comprehensive statistical investigation of fire accidents of the electric automobile shows that about 1/3 of the fire accidents are caused by road foreign body impact or other types of mechanical loads. In the whole car level, the battery pack of the electric car passenger car is generally designed to be arranged at the bottom of the car body, the design reduces the ground clearance of the car, the problem of bottom supporting safety is easier to cause in dynamic running, and the ground impact caused by ground impact objects can lead to deformation or damage of the battery pack structure, thereby causing thermal runaway of an energy storage element and serious fire accidents. The bottom supporting working condition refers to that the bottom of the automobile touches the ground or protrudes obstacles to strike the bottom of the automobile during running.

In the prior art, in order to improve the anti-bottom supporting capacity of a battery pack, the measures of directly reinforcing the thickness of a liquid cooling plate, improving the strength of reinforcing ribs and the like or reinforcing a bottom protection plate structure and the like are generally adopted, and the measures can improve the anti-bottom supporting capacity to a certain extent, but bring about the increase of cost and weight, increase the energy consumption of the whole vehicle and reduce the cruising duration.

Disclosure of utility model

The utility model aims to provide a battery pack.

In order to achieve the above object, the present utility model provides a battery pack comprising:

the battery module comprises at least one row of battery packs, and each row of battery packs comprises a plurality of electric cores;

The heat exchange piece comprises a heat exchange main body and a plurality of protection protrusions, each protection protrusion is connected with the heat exchange main body, and a space is reserved between two adjacent protection protrusions;

The heat exchange piece is attached to one surface of the battery module, and all the protection protrusions face away from the battery module and extend in a direction away from the battery module.

In some embodiments, the protective projections each extend at an angle A to the surface of the heat exchange body adjacent to the protective projections, and 30A 90.

In some embodiments, the included angle a is between 30 ° and 60 °.

In some embodiments, the shield projection has a first sidewall and a second sidewall opposite the first sidewall, the first sidewall having an angle of less than or equal to 90 ° with a surface of the heat exchange body proximate the shield projection;

at least part of the protection bulge is provided with a notch part from the first side wall to the second side wall.

In some embodiments, the heat exchange member is attached to the bottom of the battery module.

In some embodiments, the notch portion has an inner sidewall, a maximum distance from the inner sidewall to the first sidewall is a, and in the protection protrusion, a distance from the first sidewall to the second sidewall is b, where a and b satisfy: a/b is less than or equal to 0.5.

In some embodiments, the heat exchange body is provided with heat exchange channels for passing a heat exchange medium therethrough to exchange heat with the battery module.

In some embodiments, the heat exchange body includes a first plate body and a second plate body, the first plate body and the second plate body are arranged at intervals to form the heat exchange channel, and opposite ends of the first plate body are respectively connected with the second plate body.

In some embodiments, the heat exchange body further comprises a reinforcing rib disposed in the heat exchange channel, the reinforcing rib connecting the first plate body and the second plate body;

The protection bulge is provided with a first side wall and a second side wall opposite to the first side wall, an included angle between the first side wall and the surface of the heat exchange main body, which is close to the protection bulge, is smaller than or equal to 90 degrees, and the distance between the first side wall and the second side wall is b; the width of the reinforcing rib is c, and b and at least part of the width c of the reinforcing rib satisfy the following conditions: b/c is less than or equal to 1.

In some embodiments, the heat exchange body is integrally formed with the shield protrusion.

Compared with the prior art, the utility model provides a battery pack, which has the beneficial effects that:

The battery pack comprises a battery module and a heat exchange piece, wherein the battery module comprises at least one row of battery packs, each row of battery packs comprises a plurality of battery cells, the heat exchange piece comprises a heat exchange main body and a plurality of protection protrusions, each protection protrusion is connected with the heat exchange main body, a space is reserved between two adjacent protection protrusions, the heat exchange piece is attached to one surface of the battery module, and all the protection protrusions face away from the battery module and extend towards a direction far away from the battery module. Based on the structure, when the bottom supporting or other impact collision conditions to the battery pack occur, the protection bulge is bent and deformed before the heat exchange main body and absorbs impact energy, so that the deformation of the heat exchange main body and the battery cell is obviously reduced, the effects of buffering and protecting the battery cell and the heat exchange main body are achieved, and the safety performance of the battery pack is effectively improved; secondly, for the mode of increasing thickness, set up the bellied structural style weight of protection lighter, the cost is lower, and whole car energy consumption is lower, has guaranteed electric automobile's duration.

Drawings

FIG. 1 is a schematic perspective view of a heat exchange member according to an embodiment of the present utility model;

FIG. 2 is a schematic front view of a heat exchange member according to an embodiment of the present utility model;

FIG. 3 is an enlarged partial schematic view of the area A in FIG. 2;

FIG. 4 is a schematic view of a heat exchange member according to another embodiment of the present utility model;

fig. 5 is a partial schematic structure of a battery pack according to still another embodiment of the present utility model;

FIG. 6 is a partially enlarged schematic illustration of region B of FIG. 5;

FIG. 7 is a schematic view of a heat exchange member according to another embodiment of the present utility model;

fig. 8 is an enlarged partial schematic view of region C in fig. 7.

In the figure: 10. a heat exchange member; 100. a heat exchange main body; 110. a first plate body; 120. a second plate body; 121. a bottom surface; 130. a protective protrusion; 131. a notch portion; 131a, inner side walls; 132. an end face; 133. a first sidewall; 134. a second sidewall; 140. a heat exchange channel; 150. reinforcing ribs; 20. a battery module; 200. and a battery cell.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is to be understood that in the description of the present application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, i.e., features defining "first," "second," may explicitly or implicitly include one or more such features. Furthermore, unless otherwise indicated, the meaning of "a plurality" is two or more.

It should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

CTP (Cell to PACK) technology refers to the integration of the cells directly into the battery PACK, omitting the assembly steps required by conventional module architecture. The conventional battery pack is composed of a plurality of battery modules, each module comprises a plurality of battery cells, and the modules are connected by connectors, so that the structure has the problems of space waste, energy loss and thermal coupling between battery components to a certain extent. However, the battery pack formed by the CPT technology is relatively weak in impact resistance due to the fact that a module structure is omitted, deformation is serious when the battery pack meets the bottom supporting condition, and the possibility of battery failure is high. Therefore, no matter the battery cell in the battery pack formed by CTP or the battery cell in the traditional battery module, special impact resistance design is required.

With the above consideration in mind, as shown in fig. 1, 2 and 5, an embodiment of the present utility model provides a battery pack, including a battery module 20 and a heat exchanging member 10, wherein the battery module 20 includes at least one row of battery packs, each row of battery packs includes a plurality of electric cores 200, the heat exchanging member 10 includes a heat exchanging body 100 and a plurality of protection protrusions 130, each protection protrusion 130 is connected with the heat exchanging body 100, and a space is provided between two adjacent protection protrusions 130; the heat exchange member 10 is attached to a surface of the battery module 20, and all the protection protrusions 130 are disposed opposite to the battery module 202 and extend away from the battery module 20.

Specifically, the battery cell 200 has six orientations of a top surface, a front surface, a rear surface, a left surface, a right surface and a bottom surface, and one or more orientations of the six orientations of the battery cell 200 can be attached with the heat exchange member 10 so as to protect the battery cell 200 from one or more orientations. In the present embodiment, the heat exchange body 100 is attached to the bottom of the battery module 20, that is, the heat exchange member 10 is attached to the bottom surface of the battery cell 200. In some embodiments, the heat exchange member 10 includes a plurality of battery modules 20 that enclose a receiving chamber, and the battery cells 200 are disposed in the receiving chamber. In some embodiments, the protection protrusion 130 is integrally formed with the heat exchange body 100, such that the structural strength and the connection strength are greater, the impact resistance is stronger, and the protection protrusion 130 also plays a role in heat dissipation when the heat exchange member 10 is a heat dissipation member. Of course, the protection protrusion 130 and the heat exchange body 100 may be welded, adhered, fastened (a clamping groove is provided on the heat exchange body 100), riveted, bolted, and mortise-tenon connected. It should be understood that the heat exchange member 10 is embodied as a heat dissipation member or a heating member, and the heat exchange medium may be a low temperature medium for dissipating heat from the battery module 20 or a high temperature medium for heating the battery module 20.

Based on the above structure, when the bottom supporting or other impact collision conditions to the battery pack occur, the protection protrusion 130 arranged on one side of the heat exchange main body 100 bends and deforms before the heat exchange main body 100 and absorbs impact energy, so that the deformation of the heat exchange main body 100 and the battery cell 200 is effectively reduced, the effects of buffering and protecting the battery cell 200 and the heat exchange main body 100 are achieved, and the safety performance of the battery pack is effectively improved; secondly, for the mode of increasing thickness, the structural form of the protective bulge 130 is lighter in weight and lower in cost, the whole vehicle energy consumption is lower, and the cruising of the electric vehicle is ensured.

Alternatively, as shown in fig. 3, in the present embodiment, the heat exchange body 100 is provided with heat exchange channels 140, and the heat exchange channels 140 are used for passing a heat exchange medium to exchange heat with the battery module 20, and in some embodiments, the heat exchange body 100 includes a first plate 110 and a second plate 120 that are disposed opposite to each other. The first plate body 110 and the second plate body 120 are disposed at intervals, opposite ends of the first plate body 110 are connected with the second plate body 120, respectively, and the first plate body 110 and the second plate body 120 are disposed at intervals to form a heat exchange channel 140. Specifically, the connection between the first plate 110 and the second plate 120 and the formation of the heat exchange channels 140 may be direct molding by a mold, or may be a method in which the first plate 110 and the second plate 120 are disposed opposite to each other and welded, screwed, clamped, or connected in a second other manner. In some embodiments, the heat exchange body 100 further includes a reinforcing rib 150, the reinforcing rib 150 is disposed in the heat exchange channel 140, one end of the reinforcing rib 150 is connected to the first plate 110, the other end of the reinforcing rib 150 is connected to the second plate 120, and the reinforcing rib 150 is provided in plurality; the protection protrusion 130 is disposed on a side of the second plate 120 opposite to the first plate 110. In some embodiments, the protection protrusions 130 are disposed at both sides of the second plate 120 opposite to the reinforcing ribs 150. In this way, the reinforcing rib 150 plays a role in connecting the first plate body 110 and the second plate body 120, so that the structural strength of the heat exchange main body 100 is improved, and on the other hand, the reinforcing rib 150 and the protection protrusion 130 are correspondingly arranged, so that the strength of the protection protrusion 130 can be improved, the transmission of impact force is facilitated, and the deformation of the first plate body 110 and the second plate body 120 is reduced. In addition, the structure of the heat exchange main body 100 is light, the weight and the cost of the liquid cooling plate and the bottom guard plate of the battery pack are reduced, and the light design of the new energy automobile is facilitated.

In some embodiments, the number of the guard protrusions 130 may be less than the number of the reinforcing ribs 150, and some or all of the guard protrusions 130 may be disposed corresponding to the reinforcing ribs 150. In some embodiments, the number of guard protrusions 130 is equal to and corresponds to one with the number of ribs 150. In this way, the impact strength of the protection protrusion 130 can be improved, and the deformation of the first plate 110 and the second plate 120 when being impacted can be further reduced.

Optionally, as shown in fig. 3, in this embodiment, the protecting protrusion 130 includes a first side wall 133 and a second side wall 134 opposite to the first side wall 133, an angle between the first side wall 133 and a surface of the heat exchange body 100 adjacent to the protecting protrusion 130 is less than or equal to 90 °, the surface of the heat exchange body 100 adjacent to the protecting protrusion 130 is a plane, and a distance between the first side wall 133 and the second side wall 134 is b, that is, a thickness of the protecting protrusion 130 is b; the width of the ribs 150 is c, and b and at least part of the width c of the ribs 150 satisfy: b/c is less than or equal to 1. In this way, the reinforcing ribs 150 are prevented from being severely deformed or broken. It should be appreciated that b/c.ltoreq.1 may be satisfied for either part of the ribs 150, i.e. one or more ribs 150, or all ribs 150.

Considering that the backing is generally occurred during the running of the automobile, that is, the obstacle is generally a collision impact with the shielding protrusion 130 from the front side or the rear side of the shielding protrusion 130, the shielding protrusion 130 is optionally disposed obliquely with respect to the surface of the heat exchange body 100 facing away from the battery cell 200 as shown in fig. 4 in the present embodiment. As such, the guard protrusion 130 is more likely to be bent and deformed when receiving an impact force, thereby absorbing more impact energy more rapidly.

Alternatively, as shown in fig. 4, in the present embodiment, the heat exchange body 100 includes a bottom surface 121, and the bottom surface 121 is a plane, that is, the first sidewall 133 is a sidewall adjacent to the bottom surface 121 of the heat exchange body 100. The angle A formed between the first side wall 133 and the bottom surface 121 is 30 DEG A90 deg. The heat exchange pieces 10 with different included angles A are designed, and impact deformation tests are respectively carried out after the heat exchange pieces are assembled into a battery pack. Specifically, a ball with a diameter of 150mm is adopted, the same impact force is applied to the protection bulge 130 from the bottom of the battery pack by 120J energy, then measuring Z-direction deformation of the battery cells corresponding to different included angles A by using a measuring tool such as a vernier caliper, and the Z-direction deformation of the battery cells corresponding to the included angles is obtained as shown in the following table 1.

TABLE 1

As can be seen from table 1, as the included angle a increases gradually, the Z-directional deformation of the battery cell tends to decrease first and then increase, and accordingly, the impact energy absorbable by the protection protrusion tends to decrease first and then increase. When the included angle A is 45 degrees, the Z-direction deformation of the battery cell reaches the minimum value, and when the included angle A is 30 degrees and 90 degrees, the Z-direction deformation of the battery cell is similar and smaller than 1mm. Therefore, the included angle A is limited between 30 degrees and 90 degrees, so that the impact energy absorbed by the protection bulge is larger, and the Z-direction deformation of the battery cell is relatively smaller. Preferably, the angle a is between 30 ° and 60 °. When the angle a is larger than 60 degrees, more impact energy can be absorbed, but the protective bulge 130 is not easy to bend and deform, and one end of the protective bulge 130 away from the heat exchange main body 100 is relatively close to the ground, so that the bottom supporting condition is easy to occur; when the angle a is smaller than 30 °, the margin of bending deformation of the guard protrusion 130 is smaller, and the absorbable impact energy is smaller.

Alternatively, as shown in fig. 6 and 7, in the present embodiment, at least part of the shielding protrusion 130 is formed with a notch 131 from the first sidewall 133 toward the second sidewall 134. So, when taking place to hold in the palm the end that the heat transfer main part 100 was kept away from to the protection arch 130 first towards notch 131 department bending deformation, namely, protection arch 130 part takes place to the bending deformation position of the protection arch 130 of being convenient for control need not whole protection arch 130 and takes place to deform, only need increase the deformation range of local protection arch 130, and then improve the performance of preventing the ball and hit, avoid because of protection arch 130 whole bending deformation great lead to first plate body 110 and second plate body 120 deformation arch, thereby avoid leading to liquid cooling board and/or electric core 200 to receive the secondary impact of heat transfer main part 100.

Alternatively, as shown in fig. 8, in the present embodiment, the distance from the end of the protecting protrusion 130 away from the heat exchange body 100 to the heat exchange body 100 is H, and the distance from the notch 131 to the heat exchange body 100 is H, for example, H/h=1/2 or H/h=7/12 or H/h=2/3. Thus, the bending deformation position of the protection protrusion 130 can be controlled, and the first plate 110, the second plate 120 and the battery cell 200 can be effectively prevented from being subjected to secondary impact caused by the bending deformation of the protection protrusion 130. Alternatively, as shown in fig. 8, in the present embodiment, the notch 131 has an inner sidewall 131a, the maximum distance from the inner sidewall 131a to the first sidewall 133 is a, and in the protection protrusion, the distances from the first sidewall 133 to the second sidewall 134 are b, where a and b satisfy: a/b is less than or equal to 0.5. In this way, the protective protrusion 130 is prevented from being directly broken and thus from being failed due to the excessive depth of the notch 131.

Alternatively, as shown in fig. 4, in the present embodiment, the end of the protecting protrusion 130 away from the heat exchange body 100 has an end surface 132, the end surface 132 faces away from the bottom surface 121, and the end surface 132 is disposed parallel to the bottom surface 121. Thus, the structure of the protection protrusion 130 is more reasonable, and the impact absorbing performance is better while the manufacturing is facilitated.

Example 1

As shown in fig. 1 to 5, an embodiment of the present utility model provides a battery pack including a battery module 20 and a heat exchanging member 10, the battery module 20 including at least one row of battery packs, each row of battery packs including a plurality of battery cells 200, the heat exchanging member 10 including a heat exchanging body 100 and a plurality of shielding protrusions 130, each shielding protrusion 130 being connected to the heat exchanging body 100 with a space between two adjacent shielding protrusions 130;

The heat exchange member 10 is attached to the bottom of the battery module 20, and all the protection protrusions 130 are opposite to the battery module 202 and extend away from the battery module 20. The heat exchange main body 100 comprises a first plate body 110, a second plate body 120 and reinforcing ribs 150 which are oppositely arranged, wherein the end of the first plate body 110 is connected with the second plate body 120, a heat exchange channel 140 is formed by arranging the first plate body 110 and the second plate body 120 at intervals, the reinforcing ribs 150 are arranged at the position of the heat exchange channel 140, one ends of the reinforcing ribs 150 are connected with the first plate body 110, the other ends of the reinforcing ribs 150 are connected with the second plate body 120, the reinforcing ribs 150 are arranged in a plurality, the protection protrusions 130 are arranged on one side, opposite to the first plate body 110, of the second plate body 120, and the number of the protection protrusions 130 is equal to that of the reinforcing ribs 150 and corresponds to one.

The protection protrusion 130 is vertically disposed on a side of the protection plate facing away from the battery cell 200.

Example 2

As shown in fig. 4, this embodiment is different from embodiment 1 in that the protection protrusion 130 is disposed obliquely with respect to a side surface of the heat exchange body 100 facing away from the battery cell 200. The shield protrusion 130 includes a first sidewall 133, and the heat exchange body 100 includes a bottom surface 121, and the first sidewall 133 is a side surface adjacent to the bottom surface 121 of the heat exchange body 100. The angle a formed between the first sidewall 133 and the bottom surface 121 is 50 °.

Example 3

As shown in fig. 5 to 8, the present embodiment is different from embodiment 1 in that the protection protrusion 130 is disposed obliquely with respect to a side surface of the heat exchange body 100 facing away from the battery cell 200. The shield protrusion 130 includes a first sidewall 133, and the heat exchange body 100 includes a bottom surface 121, and the first sidewall 133 is a side surface adjacent to the bottom surface 121 of the heat exchange body 100. The angle a formed between the side face 133 and the bottom face 121 is 50 °. At least part of the shielding protrusion 130 is formed with a notch 131 from the first sidewall 133 toward the second sidewall 134, and the notch 131 faces the bottom 121 of the heat exchange body 100. The notch 131 has an inner sidewall 131a, a maximum distance from the inner sidewall 131a to the first sidewall 133 is a, and in the protection protrusion, a distance from the first sidewall 133 to the second sidewall 134 is b, where a and b satisfy: a/b=0.4.

Example 4

The difference between this embodiment and embodiment 3 is that the distance from the end of the protecting protrusion 130 away from the heat exchange body 100 to the heat exchange body 100 is H, the distance from the notch 131 to the heat exchange body 100 is H, and H satisfy: h/h=7/12.

In summary, the embodiment of the utility model provides a battery pack, which mainly comprises a battery module 20 and a heat exchange member 10, wherein the battery module 20 comprises at least one row of battery packs, each row of battery packs comprises a plurality of electric cores 200, the heat exchange member 10 comprises a heat exchange main body 100 and a plurality of protection protrusions 130, each protection protrusion 130 is connected with the heat exchange main body 100, and a space is reserved between two adjacent protection protrusions 130;

The heat exchange member 10 is attached to a surface of the battery module 20, and all the protection protrusions 130 face away from the battery module 202 and extend away from the battery module 20. Compared with the prior art, the battery pack has the following advantages:

1. When the bottom supporting occurs, the protection bulge 130 arranged on one side of the protection plate body is bent and deformed before the heat exchange main body 100 and absorbs impact energy, so that the deformation of the heat exchange main body 100 and the battery cell 200 is obviously reduced, the effects of buffering and protecting the battery cell 200 are achieved, and the safety performance of the battery pack is effectively improved; secondly, for the mode of increasing thickness, the structural form of the protective bulge 130 is lighter in weight and lower in cost, the whole vehicle energy consumption is lower, and the cruising of the electric vehicle is ensured.

2. The reinforcing rib 150 plays a role in connecting the first plate body 110 and the second plate body 120, so that the structural strength of the heat exchange main body 100 is improved, and on the other hand, the reinforcing rib 150 is arranged corresponding to the protection protrusion 130, so that the strength of the protection protrusion 130 can be improved, the transmission of impact force is facilitated, and the deformation of the first plate body 110 and the second plate body 120 is reduced. In addition, the structure of the heat exchange main body 100 is light, the weight and the cost of the liquid cooling plate and the bottom guard plate of the battery pack are reduced, and the light design of the new energy automobile is facilitated.

3. The protection protrusion 130 is disposed to be inclined with respect to a side surface of the heat exchange body 100 facing away from the battery cell 200, and when receiving an impact force, the protection protrusion 130 is more easily bent and deformed, thereby more rapidly absorbing more impact energy.

4. When the bottom supporting occurs, the end of the protection protrusion 130 away from the heat exchange main body 100 is bent and deformed towards the notch 131, so that the bending and deformation position of the protection protrusion 130 is controlled conveniently, deformation and arching of the first plate body 110 and the second plate body 120 due to large overall bending and deformation of the protection protrusion 130 are avoided, and secondary impact of the liquid cooling plate and/or the battery cell 200 on the heat exchange main body 100 is avoided.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (10)

1. A battery pack, comprising:

the battery module comprises at least one row of battery packs, and each row of battery packs comprises a plurality of electric cores;

The heat exchange piece comprises a heat exchange main body and a plurality of protection protrusions, each protection protrusion is connected with the heat exchange main body, and a space is reserved between two adjacent protection protrusions;

The heat exchange piece is attached to one surface of the battery module, and all the protection protrusions face away from the battery module and extend in a direction away from the battery module.

2. The battery pack as claimed in claim 1, wherein each of the shielding protrusions extends at an angle a with respect to a surface of the heat exchange body adjacent to the shielding protrusion, and a is 30 ° or more and 90 ° or less.

3. The battery pack of claim 2, wherein the included angle a is between 30 ° and 60 °.

4. A battery pack as claimed in any one of claims 1 to 3, wherein the shield projection has a first side wall and a second side wall opposite to the first side wall, and an angle between the first side wall and a surface of the heat exchange body adjacent to the shield projection is less than or equal to 90 °;

at least part of the protection bulge is provided with a notch part from the first side wall to the second side wall.

5. A battery pack as claimed in any one of claims 1 to 3, wherein the heat exchanging member is attached to the bottom of the battery module.

6. The battery pack according to claim 4, wherein the notch portion has an inner sidewall, a maximum distance from the inner sidewall to the first sidewall is a, and in the protection protrusion, a distance from the first sidewall to the second sidewall is b, and a and b satisfy: a/b is less than or equal to 0.5.

7. A battery pack as claimed in any one of claims 1 to 3, wherein the heat exchange body is provided with heat exchange channels for passing a heat exchange medium therethrough for heat exchange of the battery module.

8. The battery pack as claimed in claim 7, wherein the heat exchange body comprises a first plate body and a second plate body, the first plate body and the second plate body are arranged at intervals to form the heat exchange channel, and opposite ends of the first plate body are respectively connected with the second plate body.

9. The battery pack of claim 8, wherein the heat exchange body further comprises a stiffener disposed within the heat exchange channel, the stiffener connecting the first plate and the second plate;

The protection bulge is provided with a first side wall and a second side wall opposite to the first side wall, an included angle between the first side wall and the surface of the heat exchange main body, which is close to the protection bulge, is smaller than or equal to 90 degrees, and the distance between the first side wall and the second side wall is b; the width of the reinforcing rib is c, and b and at least part of the width c of the reinforcing rib satisfy the following conditions: b/c is less than or equal to 1.

10. A battery pack as claimed in any one of claims 1 to 3, wherein the heat exchange body is integrally formed with the shield protrusion.