CN220138413U - Battery pack - Google Patents

Abstract

The utility model relates to a battery pack, which comprises a box body and a battery module, wherein the box body comprises a coaming, a bottom plate and a top plate, an accommodating space is formed in the coaming, openings communicated with the accommodating space are formed in the opposite ends of the coaming along a first direction, the top plate and the bottom plate are respectively arranged at the opposite ends of the coaming in a covering mode to seal the openings, the battery module is arranged in the accommodating space, a first liquid cooling runner is arranged in the bottom plate, a second liquid cooling runner is arranged in the top plate, and cooling liquid is arranged in the first liquid cooling runner and the second liquid cooling runner. The battery pack integrates the liquid cooling structure in the top plate and the bottom plate of the box body, the liquid cooling plate is not required to be added independently, and the weight of the battery pack is reduced while the cooling effect of the battery pack is improved. Because no liquid cooling plate occupies the space in the box body, the containing space can contain more battery modules, and the space utilization rate of the box body is improved, so that the energy density of the battery pack is improved.

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 can produce heat in the charge and discharge process, and in order to guarantee the normal work of battery system, the battery box is usually provided with the liquid cooling system to cool down the battery module in the battery box through the liquid cooling system.

At present, the battery package includes box and battery module, and battery module sets up in the box, all is provided with the liquid cooling board between the roof and the bottom plate of battery module and box to cool down for battery module through the liquid cooling board. The prior art has the following technical defects: two liquid cooling plates are added in the box body, so that the weight of the battery pack is improved, and the liquid cooling plates occupy part of space in the box body due to certain thickness, so that the installation space of the battery module in the box body is narrowed, the space utilization rate in the box body is reduced, and the energy density of the battery pack is reduced.

Disclosure of Invention

The aim of the embodiment of the utility model is that: provided is a battery pack having a simple structure and high energy density.

To achieve the purpose, the embodiment of the utility model adopts the following technical scheme:

the utility model provides a battery pack, including box and battery module, the box includes bounding wall, bottom plate and roof, have accommodation space in the bounding wall, the bounding wall along the relative both ends of first direction all be provided with accommodation space intercommunication's opening, the roof with the bottom plate covers respectively and establishes the relative both ends of bounding wall are in order to shutoff the opening, the battery module sets up in the accommodation space, be provided with first liquid cooling runner in the bottom plate, be provided with the second liquid cooling runner in the roof, first liquid cooling runner with all be provided with the coolant liquid in the second liquid cooling runner.

As a preferred scheme of the battery pack, the bottom plate comprises a main plate, a first plate and sealing strips, wherein the first plate is arranged on two opposite side surfaces of the main plate along a second direction, the first plate is connected with the coaming in an included angle, the sealing strips are arranged on two opposite side surfaces of the main plate along a third direction, the second direction and the third direction are mutually perpendicular, a first liquid cooling cavity is penetrated and arranged in the main plate along the third direction, a second liquid cooling cavity is penetrated and arranged in the first plate along the third direction, the sealing strips seal openings of the first liquid cooling cavity and the second liquid cooling cavity, and the first liquid cooling cavity and the second liquid cooling cavity are communicated to form a first liquid cooling runner; and/or the number of the groups of groups,

the top plate comprises a second plate and a third plate, the second plate is connected with the coaming, the third plate is arranged on one side, away from the coaming, of the second plate, and the second liquid cooling flow channel is formed by the fact that the third plate faces towards one side face of the second plate in a recessed mode.

As a preferred scheme of battery package, the battery package still includes feed liquor pipe and drain pipe, the feed liquor pipe respectively with first liquid cooling runner with the second liquid cooling runner intercommunication, the feed liquor pipe is used for to first liquid cooling runner with the input of second liquid cooling runner the coolant liquid, the drain pipe respectively with first liquid cooling runner with the second liquid cooling runner intercommunication, the drain pipe is used for discharging first liquid cooling runner with in the second liquid cooling runner the coolant liquid.

As a preferred scheme of the battery pack, at least one support is arranged in the accommodating space, all the supports divide the accommodating space into at least two chambers along the first direction, and at least one group of battery modules is arranged in each chamber.

As a preferred scheme of battery package, the bounding wall includes two first curb plates and two second curb plates, two first curb plate interval and relative setting, two the relative both ends of first curb plate pass through two the second curb plate is connected, the orientation of first curb plate a side concave mounting groove that is equipped with of battery module, first curb plate with the terminal surface that the second curb plate is connected is provided with the mounting hole of mounting groove intercommunication, part the support is followed the mounting hole inserts and establishes extremely in the mounting groove.

As a preferred scheme of battery package, the support includes baffle and two cooperation portions, two cooperation portion sets up the opposite both sides of baffle along the second direction, the length direction of cooperation portion with the length direction of mounting groove is unanimous, cooperation portion inserts and establishes in the mounting groove.

As a preferable mode of the battery pack, the separator is provided with reinforcing beams toward one side surface or both side surfaces of the battery module.

As a preferred embodiment of the battery pack, the mounting groove is formed by punching the first side plate.

As a preferred scheme of the battery pack, a first accommodating groove for accommodating the heating element is concavely formed in one side surface of the bottom plate facing the battery module; and/or the number of the groups of groups,

the upper side of the bracket is concavely provided with a second accommodating groove for accommodating the heating element.

As a preferred scheme of the battery pack, a heat-conducting silica gel pad is arranged between the top plate and the battery module; and/or the number of the groups of groups,

and a heat-conducting silica gel pad is arranged between the bottom plate and the battery module.

The embodiment of the utility model has the beneficial effects that: this battery package sets up first liquid cooling runner through on the bottom plate, sets up the second liquid cooling runner on the roof, lets in the coolant liquid in first liquid cooling runner and second liquid cooling runner to cool off simultaneously the both ends of the battery module in the accommodation space through the coolant liquid, so that this battery package has good cooling effect. And set up first liquid cooling runner on the bottom plate, set up the second liquid cooling runner in the roof, this design is equivalent to having integrated the liquid cooling structure in roof and bottom plate, need not to increase the liquid cooling plate structure alone, when improving battery package cooling effect, still reduced the weight of battery package, does not have the liquid cooling structure and occupies the space in the box to make accommodation space can hold more battery module, improved the space utilization of box, thereby improve the energy density of battery package.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic view of a battery pack according to an embodiment of the present utility model.

Fig. 2 is a cross-sectional view of a battery pack according to an embodiment of the present utility model.

Fig. 3 is a schematic exploded view of a battery pack according to an embodiment of the utility model.

Fig. 4 is a cross-sectional view of a case according to an embodiment of the present utility model.

Fig. 5 is a schematic diagram illustrating disassembly of the case according to an embodiment of the utility model.

Fig. 6 is a cross-sectional view of a base plate of an embodiment of the present utility model.

Fig. 7 is a structure of a stent according to an embodiment of the present utility model.

In the figure:

1. a case; 11. coaming plate; 111. a first side plate; 1111. a mounting groove; 112. a second side plate; 12. a bottom plate; 121. a first liquid cooling flow passage; 122. a main board; 1221. a first liquid cooling chamber; 123. a first plate; 1231. a second liquid cooling chamber; 124. a sealing strip; 13. a top plate; 131. a second liquid cooling flow path; 132. a second plate; 133. a third plate; 14. an accommodation space; 2. a battery module; 3. a liquid inlet pipe; 4. a liquid outlet pipe; 5. a bracket; 51. a partition plate; 511. a stiffening beam; 52. a mating portion; 6. a heating member; 7. a heat-conducting silica gel pad.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The battery pack can produce heat in the charge and discharge process, and in order to guarantee the normal work of battery system, the battery box is usually provided with the liquid cooling system to cool down the battery module in the battery box through the liquid cooling system.

At present, the battery pack comprises a box body and a battery module, wherein the battery module is arranged in the box body, and liquid cooling plates are arranged between the battery module and a top plate and a bottom plate of the box body so as to cool the battery module through the liquid cooling plates. The prior art has the following technical defects: two liquid cooling plates are added in the box body, so that the weight of the battery pack is improved, and the liquid cooling plates occupy part of space in the box body due to certain thickness, so that the installation space of the battery module in the box body is narrowed, the space utilization rate in the box body is reduced, and the energy density of the battery pack is reduced.

To solve the above-mentioned technical problems, an embodiment of the utility model discloses a battery pack, as shown in fig. 1 to 4, the battery pack includes a case 1 and a battery module 2, the case 1 includes a shroud 11, a bottom plate 12 and a top plate 13, an accommodating space 14 is provided in the shroud 11, openings communicating with the accommodating space 14 are provided at opposite ends of the shroud 11 along a first direction, the top plate 13 and the bottom plate 12 are respectively covered at opposite ends of the shroud 11 to seal the openings, the battery module 2 is disposed in the accommodating space 14, a first liquid cooling flow channel 121 is provided in the bottom plate 12, a second liquid cooling flow channel 131 is provided in the top plate 13, and cooling liquids are provided in the first liquid cooling flow channel 121 and the second liquid cooling flow channel 131, and are used for cooling the battery module 2. The battery pack is provided with the first liquid cooling flow channel 121 on the bottom plate 12, the second liquid cooling flow channel 131 on the top plate 13, and cooling liquid is introduced into the first liquid cooling flow channel 121 and the second liquid cooling flow channel 131 so as to cool the upper layer and the lower layer of the battery module 2 in the accommodating space 14 simultaneously through the cooling liquid, so that the battery pack has a good cooling effect. And set up first liquid cooling runner 121 on bottom plate 12, set up second liquid cooling runner 131 in roof 13, this design is equivalent to having integrated the liquid cooling structure in roof 13 and bottom plate 12, need not to increase the liquid cooling plate structure alone, when improving battery package cooling effect, still reduced the weight of battery package, does not have the liquid cooling structure to occupy the space in box 1 to make accommodation space 14 can hold more battery module 2, improved the space utilization of box 1, thereby improve the energy density of battery package.

In an embodiment, as shown in fig. 5 and 6, in order to facilitate the processing of the first liquid cooling channel 121 in the bottom plate 12, the bottom plate 12 is designed in a split manner, specifically, the bottom plate 12 includes a main plate 122, a first plate 123 and sealing strips 124, the opposite sides of the main plate 122 along the second direction are all provided with the first plate 123, the first plate 123 is connected with the coaming 11 by an included angle, the opposite sides of the main plate 122 along the third direction are all provided with the sealing strips 124, the second direction and the third direction are mutually perpendicular, a first liquid cooling cavity 1221 is penetrated in the main plate 122 along the third direction, a second liquid cooling cavity 1231 is penetrated in the first plate 123 along the third direction, the sealing strips 124 seal the openings of the first liquid cooling cavity 1221 and the second liquid cooling cavity 1231, and the first liquid cooling cavity 1221 and the second liquid cooling cavity 1231 are communicated to form the first liquid cooling channel 121. It can be appreciated that, since the first liquid cooling flow channel 121 is disposed inside the bottom plate 12, and in order to prolong the flow path of the cooling liquid in the first liquid cooling flow channel 121, the first liquid cooling flow channel 121 is a serpentine flow channel, and the serpentine flow channel cannot be directly processed and formed in the integrated plate body, so that the bottom body adopts a split type design, and cavities are respectively formed on the main plate 122 and the two first plates 123 in a penetrating manner, so that the processing of the bottom plate 12 is facilitated, and then sealing is performed at the opening of the cavities by adopting the sealing strips 124, so as to prevent the cooling liquid from flowing out of the first liquid cooling flow channel 121.

Alternatively, the first plate 123 and the coaming 11 are welded to form an L-shaped plate, which corresponds to the coaming 11 being welded to the bottom plate 12, and the connection stability between the bottom plate 12 and the coaming 11 is ensured.

In another embodiment, as shown in fig. 5, the top plate 13 includes a second plate 132 and a third plate 133, the second plate 132 is connected to the coaming 11, the third plate 133 is disposed on a side of the second plate 132 away from the coaming 11, and the second liquid cooling flow channel 131 is formed by recessing the third plate 133 toward a side surface of the second plate 132. In other embodiments, the second liquid cooling channel 131 is formed by recessing a side surface of the second plate 132 facing the third plate 133.

The first direction refers to the Z direction of the drawing coordinate system, the second direction refers to the Y direction of the drawing coordinate system, and the third direction refers to the X direction of the drawing coordinate system.

In other embodiments, the bottom plate 12 is also formed by stacking two plates along the first direction, and the first liquid cooling channel 121 is formed by recessing one of the plates, with a similar structure of the top plate 13.

Specifically, as shown in fig. 1, the battery pack further includes a liquid inlet pipe 3 and a liquid outlet pipe 4, the liquid inlet pipe 3 is respectively communicated with the first liquid cooling runner 121 and the second liquid cooling runner 131, the liquid cooling pipe is used for inputting cooling liquid to the first liquid cooling runner 121 and the second liquid cooling runner 131, the liquid outlet pipe 4 is respectively communicated with the first liquid cooling runner 121 and the second liquid cooling runner 131, and the liquid outlet pipe 4 is used for discharging the cooling liquid in the first liquid cooling runner 121 and the second liquid cooling runner 131, so that the cooling liquid in the first liquid cooling runner 121 and the second liquid cooling runner 131 can circulate, and the cooling liquid can be guaranteed to take away heat generated by the battery module 2. In addition, the first liquid cooling flow channel 121 and the second liquid cooling flow channel 131 share one liquid inlet pipe 3 and one liquid outlet pipe 4, so that the use of pipelines is reduced, the weight of the battery pack is further reduced, and the manufacturing cost is reduced.

It can be understood that the liquid inlet pipe 3 and the liquid outlet pipe 4 are both connected with a refrigerating mechanism, the refrigerating mechanism is provided with a pressure pump, the liquid outlet pipe 4 conveys the cooling liquid after absorbing heat to the refrigerating mechanism under the action of the pressure pump, and the refrigerating mechanism cools the cooling liquid, and then the cooled cooling liquid is input into the first liquid cooling flow channel 121 and the second liquid cooling flow channel 131 through the liquid inlet pipe 3.

Optionally, the cooling liquid can be any one of glycol, water or glycerin, and the glycol, the water and the glycerin are all common cooling liquids, and have good cooling effect.

In this embodiment, as shown in fig. 2 to 4, at least one bracket 5 is disposed in the accommodating space 14, and all the brackets 5 divide the accommodating space 14 into at least two chambers along the first direction, and each chamber is provided with a group of battery modules 2. The support 5 is used as a supporting structure of the battery module 2, and supports the battery module 2 above the support 5, so that a plurality of groups of battery modules 2 can be placed in the accommodating space 14 along the first direction. Illustratively, when the accommodating space 14 is provided with one bracket 5, the accommodating space 14 is divided into two chambers by the bracket 5, so that two layers of battery modules 2 are arranged in the battery pack, and the two battery modules 2 can be effectively cooled due to the liquid cooling structures integrated on the bottom plate 12 and the top plate 13. When two brackets 5 are arranged in the accommodating space 14 at intervals, the accommodating space 14 is partitioned into three chambers. Of course, in other embodiments, the support 5 may be three, four or other numbers, which is not limited to the present embodiment.

In an embodiment, the support 5 may be a heat conducting plate, and the battery modules 2 located at two sides of the heat conducting plate are all abutted against the heat conducting plate, so that heat can be conducted between two adjacent groups of battery modules 2, when the accommodating space 14 is divided into more than three chambers, the battery modules 2 located in the middle chamber can transfer heat to the battery modules 2 located at two sides through the heat conducting plate, and finally the battery modules 2 are cooled and radiated through cooling liquid, so that the temperature between the groups of battery modules 2 is guaranteed to be at the same temperature, and the service life of the battery pack is further prolonged.

In this embodiment, as shown in fig. 3, the cross section of the enclosure plate 11 is in a rectangular structure, specifically, the enclosure plate 11 includes two first side plates 111 and two second side plates 112, the two first side plates 111 are oppositely arranged along the second direction at intervals, opposite ends of the two first side plates 111 are connected through the two second side plates 112, a mounting groove 1111 is concavely formed in a side surface of the first side plates 111 facing the battery module 2, a mounting opening communicating with the mounting groove 1111 is formed in one end of the first side plates 111 connected with the second side plates 112, and opposite sides of the bracket 5 are inserted into the mounting groove 1111 from the mounting opening. The bracket 5 is connected with the coaming 11 in a plugging manner, so that the assembly is convenient. In a specific assembly process, the bracket 5 is first inserted into the mounting groove 1111 in a sliding manner so as to achieve pre-fixing between the bracket 5 and the coaming 11, and then the bracket 5 is welded with the first side plate 111 or the second side plate 112, so as to prevent the bracket 5 from accidentally sliding in the mounting groove 1111.

Specifically, as shown in fig. 7, the cross section of the bracket 5 is in an "i" shape, the bracket 5 includes a separator 51 and two mating parts 52, the two mating parts 52 are provided on opposite sides of the separator 51, the battery module 2 is provided on the separator 51, the length direction of the mating parts 52 is identical to the length direction of the mounting groove 1111, and the mating parts 52 are inserted into the mounting groove 1111.

Optionally, the mating portion 52 is hollowed out to reduce the weight of the bracket 5, thereby reducing the weight of the battery pack.

Alternatively, the inner sidewall of the mating part 52 is flush with the inner sidewall of the first side plate 111, so that the sidewall of the receiving space 14 has a planar structure, facilitating the installation of the battery module 2.

In order to further improve the load-bearing capacity of the bracket 5, reinforcing beams 511 are provided at one or both sides of the separator 51 facing the battery module 2 to improve the strength of the separator 51. In this embodiment, the reinforcing beam 511 is provided at the lower surface of the separator 51, and the upper surface is planar, so that the battery module 2 is mounted on the separator 51. In some embodiments, the reinforcement beam 511 is provided on the upper surface of the partition plate 51, or the reinforcement beam 511 is provided on both the upper and lower surfaces of the partition plate 51.

Alternatively, the reinforcement beam 511 includes a cross member and a side member vertically provided on the side of the bulkhead 51 to further enhance the strength of the bulkhead 51.

In this embodiment, the partition plate 51 is spaced from at least one second side plate 112, so that a mounting position of the battery system distribution box is reserved between the partition plate 51 and the second side plate 112.

In another embodiment, the mounting groove 1111 is formed by stamping the first side plate 111, and the stamping process is simple, high in strength and not easy to damage.

In other embodiments, a groove is directly dug in the first side plate 111 to form a mounting groove 1111 for mounting the mating portion 52. Or, two mounting plates are protruded at intervals in the height direction of the battery pack at the first side plate 111, and a mounting groove 1111 is formed between the two mounting plates.

In this embodiment, as shown in fig. 2, a side surface of the bottom plate 12 facing the battery module 2 is concavely provided with a first receiving groove for receiving the heating member 6, and an upper side surface of the bracket 5 is concavely provided with a second receiving groove for receiving the heating member 6. Heating members 6 are provided in both the first and second receiving grooves to heat the battery module 2 through the heating members 6.

Wherein, the heating element 6 can be a PTC heating film which is arranged in the first accommodating groove; the heating element 6 may also be a PTC heating strip, which is arranged in the second receiving groove.

Optionally, at least two heating elements 6 are disposed along the second direction, and a liquid cooling flow channel is disposed between two adjacent heating elements 6. The battery module 2 is favorable to rising the temperature fast through setting up a plurality of heating pieces 6, and because all heating pieces 6 follow second direction interval distribution, through having increased battery module 2 heated area, be favorable to improving battery module 2 temperature's homogeneity. In this embodiment, three heating elements 6 are provided on both the base plate 12 and the partition plate 51.

In the present embodiment, as shown in fig. 3, a heat conductive silica gel pad 7 is provided between the top plate 13 and the battery module 2; and/or, a heat conductive silica gel pad 7 is provided between the bottom plate 12 and the battery module 2 to improve heat transfer efficiency between the battery module 2 and the bottom plate 12 or the top plate 13, thereby heat dissipation efficiency of the battery module 2. The heat-conducting silica gel pad 7 is arranged between the top plate 13 and the battery module 2, so that the phenomenon that the top plate 13 is in direct contact with the battery module 2 or condensed water drops on the battery module 2 to cause short circuit can be prevented.

In the description herein, it should be understood that the terms "upper," "lower," and the like are used for convenience in description and simplicity of operation only, and are not necessarily indicative or implying any particular orientation, configuration or operation of such apparatus or elements herein, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the term "an embodiment" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (10)

1. The utility model provides a battery package, its characterized in that, includes box and battery module, the box includes bounding wall, bottom plate and roof, have accommodation space in the bounding wall, the bounding wall along the relative both ends of first direction all be provided with accommodation space intercommunication's opening, the roof with the bottom plate covers respectively and establishes the relative both ends of bounding wall are in order to shutoff the opening, the battery module sets up in the accommodation space, be provided with first liquid cooling runner in the bottom plate, be provided with the second liquid cooling runner in the roof, first liquid cooling runner with all be provided with the coolant liquid in the second liquid cooling runner.

2. The battery pack according to claim 1, wherein the bottom plate comprises a main plate, a first plate and sealing strips, the first plate is arranged on two opposite sides of the main plate along a second direction, the first plate is connected with the coaming in an included angle, the sealing strips are arranged on two opposite sides of the main plate along a third direction, the second direction and the third direction are mutually perpendicular, a first liquid cooling cavity is arranged in the main plate in a penetrating manner along the third direction, a second liquid cooling cavity is arranged in the first plate in a penetrating manner along the third direction, the sealing strips seal openings of the first liquid cooling cavity and the second liquid cooling cavity, and the first liquid cooling cavity and the second liquid cooling cavity are communicated to form the first liquid cooling runner; and/or the number of the groups of groups,

the top plate comprises a second plate and a third plate, the second plate is connected with the coaming, the third plate is arranged on one side, away from the coaming, of the second plate, and the second liquid cooling flow channel is formed by the fact that the third plate faces towards one side face of the second plate in a recessed mode.

3. The battery pack according to claim 1, further comprising a liquid inlet pipe and a liquid outlet pipe, wherein the liquid inlet pipe is respectively communicated with the first liquid cooling flow channel and the second liquid cooling flow channel, the liquid inlet pipe is used for inputting the cooling liquid to the first liquid cooling flow channel and the second liquid cooling flow channel, the liquid outlet pipe is respectively communicated with the first liquid cooling flow channel and the second liquid cooling flow channel, and the liquid outlet pipe is used for discharging the cooling liquid in the first liquid cooling flow channel and the second liquid cooling flow channel.

4. A battery pack according to any one of claims 1-3, wherein at least one rack is provided in the receiving space, all of the racks dividing the receiving space into at least two chambers in the first direction, each chamber having at least one set of the battery modules provided therein.

5. The battery pack according to claim 4, wherein the surrounding plate comprises two first side plates and two second side plates, the two first side plates are arranged at intervals and are opposite to each other, opposite ends of the two first side plates are connected through the two second side plates, a side surface of the first side plate facing the battery module is concavely provided with a mounting groove, one end surface of the first side plate connected with the second side plate is provided with a mounting opening communicated with the mounting groove, and a part of the support is inserted into the mounting groove from the mounting opening.

6. The battery pack according to claim 5, wherein the bracket includes a separator and two engaging portions provided on opposite sides of the separator in the second direction, a length direction of the engaging portions being identical to a length direction of the mounting groove, the engaging portions being inserted in the mounting groove.

7. The battery pack according to claim 6, wherein the separator is provided with reinforcing beams toward one side or both sides of the battery module.

8. The battery pack of claim 5, wherein the mounting groove is stamped and formed from the first side plate.

9. The battery pack according to claim 5, wherein a side of the bottom plate facing the battery module is concavely provided with a first receiving groove for receiving a heating member; and/or the number of the groups of groups,

the upper side of the bracket is concavely provided with a second accommodating groove for accommodating the heating element.

10. The battery pack according to any one of claims 1 to 3, wherein a thermally conductive silicone pad is provided between the top plate and the battery module; and/or the number of the groups of groups,

and a heat-conducting silica gel pad is arranged between the bottom plate and the battery module.