CN115764076B

CN115764076B - Battery module and battery pack

Info

Publication number: CN115764076B
Application number: CN202310034308.7A
Authority: CN
Inventors: 尚随军; 胡先刚; 王林; 袁丹丹; 吴刚
Original assignee: Suzhou Youlionbattery Inc
Current assignee: Suzhou Youlionbattery Inc
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-04-28
Anticipated expiration: 2043-01-10
Also published as: CN115764076A

Abstract

The invention belongs to the technical field of batteries, and discloses a battery module and a battery pack, wherein the battery module comprises a hollow battery cell and a shell, the shell comprises an upper cooling part, a lower cooling part and a side cooling part, the side cooling part is supported between the upper cooling part and the upper cooling part, the lower cooling part and the side cooling part are respectively contacted with the upper end, the lower end and the side wall of the battery cell which are arranged in a matrix manner and fixedly seal the battery cell in the shell, and cavities for accommodating cooling mediums are formed in the upper cooling part, the lower cooling part and the side cooling part. According to the battery module and the battery pack, the shell can be used for carrying the battery cells, meanwhile, the upper ends and the lower ends of the battery cells which are arranged in the matrix can be cooled through the upper cooling part and the lower cooling part, and the side walls of the battery cells which are arranged in the matrix can be cooled through the side cooling parts, so that the overall cooling effect of the battery cells which are arranged in the matrix is improved.

Description

Battery module and battery pack

Technical Field

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

Background

The lithium ion battery has the advantages of green environmental protection, high energy density, high output voltage, small self-discharge and the like, and is widely applied to various living scenes, such as mobile phones, notebooks, automobiles and the like. With the development of the age, the requirements of people on lithium ion batteries are also higher and higher, and especially the requirements on the power, the energy density and the safety performance of the lithium ion batteries are more urgent.

The lithium ion battery has the characteristics of thermal runaway transmission blocking property, good sealing property and high product consistency, and has higher safety performance in the whole life cycle. Traditional lithium ion battery is mostly solid structure, and the heat dissipation only relies on the casing surface, and the inside heat of lithium ion battery can't the quick transmission to the casing surface, leads to the inside and outside temperature difference of lithium ion battery big, and lithium ion battery cycle life reduces. Along with the increase of lithium ion battery size, the heat in the battery is more difficult to diffuse to the battery surface, and because the demand of fast charge is higher and higher, the multiplying power of charging is increased along with the increase, and the battery temperature rise is also higher, influences the heat dissipation problem of the battery module that a plurality of single cell arrays are constituteed to influence its life.

In the prior art, a cooling structure is arranged in a box body provided with a module, but the cooling structure has certain limitation, only the side wall of the lithium ion battery can be cooled, the heat dissipation problem can not be effectively solved, and the heat dissipation efficiency is low.

Disclosure of Invention

The invention aims to provide a battery module and a battery pack capable of rapidly radiating heat.

To achieve the purpose, the invention adopts the following technical scheme:

the invention provides a battery module, which comprises a battery monomer and a shell for loading the battery monomer, wherein the battery monomer is a hollow battery, a plurality of battery monomers are arranged in a matrix form into one or more groups, the shell comprises an upper cooling part, a lower cooling part and a side cooling part, and the side cooling part is supported between the upper cooling part and the lower cooling part;

the upper cooling part, the lower cooling part and the side cooling part are respectively contacted with the upper ends, the lower ends and the side walls of the battery cells which are arranged in a matrix manner and fixedly seal the battery cells in the shell, and cavities for accommodating cooling mediums are formed in the upper cooling part, the lower cooling part and the side cooling part.

Preferably, the upper cooling part comprises an upper cover plate and a first hollow plate buckled with the upper cover plate;

the lower cooling part comprises a lower cover plate and a second hollow plate buckled with the lower cover plate;

the first hollow plate and the second hollow plate are both provided with cavities.

The upper cooling part is formed by the upper cover plate and the first hollow plate, and the lower cooling part is formed by the lower cover plate and the second hollow plate, so that the cavity can be processed more easily and is easy to maintain compared with the upper cooling part formed by adopting an integrally-formed processing mode.

Preferably, the first hollow plate and the second hollow plate are each provided with an input end and an output end through which the cooling medium flows;

and notches matched with the input end or the output end are formed in the upper cover plate and the lower cover plate, and when the upper cover plate is buckled with the first hollow plate, the lower cover plate is buckled with the second hollow plate, the input end and the output end are embedded into the notches.

Through setting up the notch, do benefit to the equipment of upper cover plate and first cavity board, lower apron and second cavity board, and can provide a dismantlement's impetus, do benefit to follow-up dismantlement operation.

Preferably, the upper cooling part and the lower cooling part are respectively provided with a plug-in nozzle, and the plug-in nozzles are correspondingly and hermetically plugged in the hollow cavities of the battery cells.

Through setting up the grafting mouth for first cavity board and second cavity board are in with the free tip contact heat transfer of battery in order to cool off, can also peg graft the intercommunication with the free cavity of battery, in order to cool off the free inside of battery with the help of cooling medium.

Preferably, at least one sealing ring is arranged on the plug nozzle, the sealing rings are sleeved along the axial spacing of each plug nozzle, and the sealing rings are in interference fit with the inner wall of the hollow cavity.

By arranging the sealing ring, the sealing effect of the plug nozzle and the hollow cavity is improved.

Preferably, the upper cooling part and the lower cooling part are provided with positioning grooves for embedding the ends of the battery cells.

Through setting up the constant head tank, can provide location and spacing effect for the battery monomer when battery matrix and last cooling part, lower cooling part assemble.

Preferably, the side cooling part comprises a plurality of side cooling plates, each side cooling plate is clamped between adjacent rows or columns of battery cells, a plurality of arc grooves are formed in two side walls of each side cooling plate, which are in contact with the battery cells, and each arc groove is attached to the side wall of each battery cell.

By arranging the arc-shaped groove, the contact area between the side cooling plate and the battery monomer is enlarged, and the cooling effect on the battery monomer is improved.

Preferably, the arc grooves on both side walls of the side cooling plate are alternately arranged along the arrangement direction of the arc grooves.

Through the arc grooves arranged alternately, each battery monomer in the battery matrix is compacter in arrangement.

Preferably, the depth of the arc-shaped groove is greater than half the thickness of the side cooling plate.

By the arrangement mode, the thickness of the side cooling plate can be further reduced, and the compactness of the battery matrix is improved.

The invention also discloses a battery pack, which comprises the battery module, and a plurality of battery modules are arranged in parallel and/or in series in a stacked manner.

The invention has the beneficial effects that:

according to the battery module and the battery pack, the shell can be used for carrying the battery cells and simultaneously can be used for cooling the ends of the battery cells arranged in the matrix through the upper cooling part and the lower cooling part of the shell, and the side wall of the battery cells arranged in the matrix can be cooled through the side cooling part of the shell, so that the cooling effect on the battery cells arranged in the matrix is improved.

Drawings

Fig. 1 is a schematic view of a battery module according to an embodiment of the present invention;

fig. 2A is a schematic structural diagram of a battery cell according to a first embodiment of the present invention;

FIG. 2B is a second schematic diagram of a battery cell according to the first embodiment of the invention;

fig. 3 is an exploded view of a battery module according to a first embodiment of the present invention;

fig. 4 is a schematic view showing the structure of an upper cooling portion and a lower cooling portion in the first embodiment of the present invention;

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

fig. 6 is a sectional view of a battery module according to a first embodiment of the present invention;

FIG. 7 is a schematic diagram of a positioning slot according to a first embodiment of the present invention;

FIG. 8 is a schematic view of a side cooling plate according to a first embodiment of the present invention;

FIG. 9A is a schematic illustration of an arrangement of arcuate slots in accordance with a first embodiment of the present invention;

FIG. 9B is a second schematic diagram of an arrangement of arcuate slots in a first embodiment of the present invention;

FIG. 9C is a third schematic view of an arrangement of arcuate slots in accordance with the first embodiment of the present invention;

fig. 10 is a schematic structural view of a battery module according to a second embodiment of the present invention.

In the figure:

1. a battery cell; 101. an upper end; 102. a lower end; 103. a sidewall; 2. a housing; 201. an upper cooling part; 2011. an upper cover plate; 2012. a first hollow plate; 202. a lower cooling part; 2021. a lower cover plate; 2022. a second hollow plate; 203. a side cooling unit; 2031. a side cooling plate; 2032. an arc-shaped groove; 2033. a flow port; 3. an input end; 4. an output end; 5. a notch; 6. a plug-in nozzle; 7. a seal ring; 8. a positioning groove; 9. wire slot.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, 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 invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, 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.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

Referring to fig. 1, the embodiment discloses a battery module, which includes a battery cell 1 and a housing 2 for loading the battery cell 1, wherein the battery cell 1 is a hollow battery, a plurality of battery cells 1 are arranged in a matrix form to form a group, the matrix arrangement of the battery cells 1 in the embodiment can be understood as a combination of multiple rows and multiple columns, and two adjacent rows or columns of battery cells 1 can be symmetrically arranged, or alternatively arranged. It should be noted that, in the present embodiment, the battery cell 1 may be a cylindrical battery or a prismatic battery on the basis of being a hollow battery, and in the present embodiment, a cylindrical battery is taken as an example.

Specifically, as shown in fig. 2A and 2B, the battery cell 1 disclosed in the present embodiment is in a hollow cylindrical structure as a whole, two bottom surfaces of two ends of the axial direction of the battery cell corresponding to the cylindrical body are respectively an upper end 101 and a lower end 102, a circumferential side surface of the battery cell corresponding to the cylindrical body is a side wall 103, and a hollow cavity penetrating from the upper end 101 to the lower end 102 is also provided.

Referring to fig. 1 again, the housing 2 includes an upper cooling portion 201, a lower cooling portion 202 and a side cooling portion 203, wherein the side cooling portion 203 is supported between the upper cooling portion 201 and the upper cooling portion 201, and it is known that the upper cooling portion 201 and the lower cooling portion 202 are generally parallel, and the side cooling portion 203 is perpendicular to the upper cooling portion 201 and the lower cooling portion 202 so as to be supported therebetween. The upper cooling part 201, the lower cooling part 202 and the side cooling part 203 are respectively contacted with the upper ends 101, the lower ends 102 and the side walls 103 of the battery cells 1 which are arranged in a matrix and fixedly seal the battery cells 1 in the shell 2, and cavities for accommodating cooling mediums are arranged in the upper cooling part 201, the lower cooling part 202 and the side cooling part 203.

It can be understood that, in the present embodiment, the upper ends 101 and the lower ends 102 of the battery cells 1 arranged in a matrix are respectively in contact with the upper cooling portion 201 and the lower cooling portion 202, the upper cooling portion 201 and the lower cooling portion 202 after the cooling medium is input exchange heat with the upper ends 101 and the lower ends 102 of the battery cells 1, so that the battery cells 1 can be further cooled, the side cooling portion 203 is in contact with the side walls 103 of the battery cells 1 arranged in a matrix, and the side cooling portion 203 exchanges heat with the side walls 103 of the battery cells 1 after the cooling medium is input. It can be seen that the upper cooling portion 201, the lower cooling portion 202 and the side cooling portion 203 are made of heat conductive materials.

Specifically, the above-mentioned cooling medium may be a fluid such as a gas or a liquid, for example, air, ethylene glycol, or the like, and the cooling medium may be circulated and heat-exchanged by an external cooling device to be maintained in a low temperature state suitable for cooling the battery cells 1.

Thus, in the battery module of this embodiment, the housing 2 can load the battery cells 1, and at the same time, the upper cooling portion 201 and the lower cooling portion 202 of the housing 2 can cool the ends of the battery cells 1 arranged in a matrix, and the side cooling portion 203 of the housing 2 can cool the side walls 103 of the battery cells 1 arranged in a matrix, so that the cooling effect of the battery cells 1 arranged in a matrix is improved.

Specifically, referring to fig. 3 and 4, in the present embodiment, the upper cooling portion 201 includes an upper cover 2011, and a first hollow plate 2012 fastened to the upper cover 2011; the lower cooling part 202 comprises a lower cover plate 2021 and a second hollow plate 2022 buckled with the lower cover plate 2021; the first hollow plate 2012 and the second hollow plate 2022 are each provided with a cavity. Namely, the upper cover plate 2011 and the first hollow plate 2012 having a groove structure are buckled together to enable the upper cooling portion 201 to form a cavity capable of inputting an external cooling medium, and the lower cover plate 2021 and the second hollow plate 2022 having a groove structure are buckled together to enable the lower cooling portion 202 to form a cavity capable of inputting an external cooling medium. In the present embodiment, the upper cooling portion 201 and the lower cooling portion 202 may be provided with only a flow passage through which the cooling medium can flow, and no cavity having a larger volume is provided, and the flow passage may be formed by drilling a hole in a plate material as a whole of the upper cooling portion 201 and the lower cooling portion 202, which is not limited herein.

Preferably, the cavity for cooling medium input formed by the upper cover plate 2011 and the first hollow plate 2012, and the cavity for cooling medium input formed by the lower cover plate 2021 and the second hollow plate 2022 are at least arranged opposite to the ends of the battery cells 1 arranged in a matrix, i.e. the projection of the cavities of the upper cooling part 201 and the lower cooling part 202 on the end surface of the battery matrix covers the ends of each battery cell 1 when viewed from the end direction of the battery matrix, so that the cooling medium in the cavities of the upper cooling part 201 and the lower cooling part 202 can directly exchange heat with the parts of the upper cooling part 201 and the lower cooling part 202 for contacting the ends of the battery cells 1, thereby improving the cooling effect.

The first hollow plate 2012 and the second hollow plate 2022 are respectively provided with an input end 3 and an output end 4 for circulating a cooling medium; the upper cover 2011 and the lower cover 2021 are provided with notches 5 matched with the input end 3 and the output end 4, and when the upper cover 2011 is buckled with the first hollow plate 2012 and the lower cover 2021 is buckled with the second hollow plate 2022, the input end 3 and the output end 4 are embedded in the notches 5. It will be appreciated that the input end 3 and the output end 4 are usually circulated by pipes, and the pipes usually occupy a certain space, and on this basis, the assembly of the upper cover 2011 and the first hollow plate 2012 and the assembly of the lower cover 2021 and the second hollow plate 2022 can be facilitated by providing the upper cover 2011 and the lower cover 2021 with notches 5 matching the input end 3 and the output end 4. On the other hand, the notch 5 can provide a disassembling force application point when the upper cover plate 2011 and the first hollow plate 2012 are disassembled, or when the lower cover plate 2021 and the second hollow plate 2022 are disassembled, so that the disassembly is easier; still further, due to the addition of the notch 5, the upper cover plate 2011 is assembled with the first hollow plate 2012, and the lower cover plate 2021 is assembled with the second hollow plate 2022 in a manner similar to a snap-fit connection, so that the connection relationship is more stable, and an interference fit effect can be achieved, so as to improve the sealing effect of the assembled upper cooling portion 201 and lower cooling portion 202. It can be appreciated that the shape of the recess 5 in the present embodiment may be adaptively set according to the shapes of the input end 3 and the output end 4, for example, the input end 3 and the output end 4 with circular cross sections correspond to the recess 5 with a circular arc shape.

Referring to fig. 4, based on the above, the cavities on the first hollow plate 2012 and the second hollow plate 2022 may be disposed corresponding to the battery cells 1 arranged in a matrix, that is, a plurality of cavity units may be disposed corresponding to each row or column of the battery cells 1 on the basis of the arrangement of the battery cells 1 in a row or column, and each cavity unit is provided with a corresponding input end 3 and output end 4. Based on this, a single cavity unit may be adapted to the shape of a matrix unit formed by each row or column of battery cells 1 to further reduce the volume of the cavity unit, and reduce the time required for the cooling medium to fill the entire cavity unit, so as to facilitate the improvement of the cooling effect on the battery cells 1.

On the basis that the first hollow plate 2012 and the second hollow plate 2022 are disposed by a plurality of hollow units, since each hollow unit needs to be correspondingly provided with the input end 3 and the output end 4, a phenomenon of pipe confusion is easy to occur, and in order to make a predetermined distance between the input end 3 and the output end 4, in this embodiment, the input ends 3 or the output ends 4 of two adjacent hollow units are staggered, that is, the input ends or the output ends 4 of two adjacent hollow units are located at different ends of the hollow units.

Specifically, referring to fig. 5 and 6, in the present embodiment, the first hollow plate 2012 and the second hollow plate 2022 are provided with the plug connector 6, and the plug connector 6 on the first hollow plate 2012 corresponds to the plug connector 6 on the second hollow plate 2022, and the plug connector 6 is correspondingly and hermetically plugged into the hollow cavity of the battery cell 1. In the present embodiment, the plug 6 is provided to allow communication between the upper cooling part 201 and the lower cooling part 202 and the hollow cavity inside the battery cell 1, so that the cooling medium fed into the upper cooling part 201 or the lower cooling part 202 can flow through the plug 6 and the hollow cavity of the battery cell 1, thereby cooling the inside of the battery cell 1. It can be known that the plug connectors 6 on the first hollow plate 2012 and the second hollow plate 2022 are disposed in a one-to-one correspondence with the battery cells 1 arranged in a matrix.

Based on the above, after one of the upper cooling part 201 and the lower cooling part 202 is introduced with the cooling medium, the cooling medium can flow through the hollow cavity of the battery cell 1, and flow out from the other of the upper cooling part 201 and the lower cooling part 202, thereby forming a cooling circuit with the cooling device to cool the end portion of the battery cell 1 and the hollow cavity. After the cooling medium is introduced into the side cooling part 203, the cooling medium can flow in and out from both ends of the side cooling part 203, respectively, so that another cooling circuit is formed between the cooling medium and the cooling device to cool the side wall 103 portion of the battery cell 1. The cooling medium in the two cooling circuits flowing to the upper cooling portion 201 and the lower cooling portion 202 and to the side cooling portion 203 may be supplied by the same or different cooling apparatuses, and are not limited herein. As a result, the hollow cavities of the battery cells 1 can be cooled at the same time, that is, the multi-directional cooling can be achieved by one cooling structure, on the premise that the upper cooling portion 201 and the lower cooling portion 202 can cool the end portions of the battery cells 1. Further, it can be understood that in the present embodiment, the through-flow of the cooling medium with the upper cooling portion 201 and the lower cooling portion 202 is achieved by providing the plug connector 6, so that the cooling medium can accurately flow into the hollow cavity or flow out of the hollow cavity into the upper cooling portion 201 or the lower cooling portion 202, and on the other hand, the plug connector 6 needs to be sealed and plugged with the hollow cavity of the battery cell 1, so that an initial positioning effect can be provided for the battery cell 1 when the battery cell 1 is assembled with the upper cooling portion 201 and the lower cooling portion 202.

Based on the above, in order to be able to form a circuit, one of the first hollow plate 2012 and the second hollow plate 2022 is provided with the input end 3, and the other of the first hollow plate 2012 and the second hollow plate 2022 is provided with the output end 4, so that after the cooling medium is input to the one of the first hollow plate 2012 and the second hollow plate 2022, it can be output through the other of the first hollow plate 2012 and the second hollow plate 2022.

Preferably, the depth of insertion of the plug 6 into the hollow cavity of the battery cell 1 is generally 1/11-1/9 of the length of the battery cell 1. It will be appreciated that, in order that the cooling medium will not overflow from the open end of the hollow cavity when the spigot 6 is docked with the hollow cavity, the cooling medium will be less likely to overflow mainly according to the depth of insertion of the spigot 6 into the hollow cavity, i.e. the deeper the spigot 6 is inserted into the hollow cavity; meanwhile, as the depth of the insertion nozzle 6 inserted into the hollow cavity increases, the area of the inner wall of the hollow cavity in direct contact with the cooling medium gradually decreases, i.e., the cooling effect of the cooling medium on the hollow cavity decreases. In this embodiment, the depth of the insertion nozzle 6 inserted into the hollow cavity of the battery cell 1 is set to be 1/11-1/9 of the length of the battery cell 1, so that the insertion nozzle 6 does not occupy an excessive contact area with the hollow cavity as much as possible under the premise of reducing the overflow of the cooling medium as much as possible. Further preferably, in this embodiment, the depth of insertion of the plug 6 into the hollow cavity of the battery cell 1 is generally 1/10 of the length of the battery cell 1.

Preferably, the insertion end of the insertion nozzle 6 has a hemispherical structure so as to be easier to insert into the hollow cavity of the battery cell 1. In this embodiment, the plug connector 6 may be made of a flexible material capable of being deformed to a certain extent, so that its size may be slightly larger than that of the hollow cavity, and when communicating with the hollow cavity, an interference fit may be achieved, thereby realizing a high seal and avoiding the overflow of the cooling medium from the hollow cavity.

Preferably, referring to fig. 5, in this embodiment, a sealing ring 7 is provided on the plug nozzle 6, and the sealing ring 7 is sleeved on the periphery of the plug nozzle 6 and is used for interference fit with the inner wall of the hollow cavity, so as to provide a sealing effect. Preferably, more than two sealing rings 7 can be arranged on each plugging nozzle 6, each sealing ring 7 arranged on each plugging nozzle 6 is sleeved along the axial spacing of each plugging nozzle 6 so as to improve the sealing effect, and when the sealing effect of one sealing ring 7 fails, the other sealing ring 7 can still meet the basic sealing requirement. Further, the respective sealing rings 7 provided on each of the plug nozzles 6 may have different cross-sectional shapes such as a circle, a D-shape, a P-shape, a corrugated shape, a trapezoid shape, etc. to compensate for possible machining dimensional deviations or structural damages of the inner wall of the hollow cavity.

Specifically, referring to fig. 7, in the present embodiment, both the upper cooling part 201 and the lower cooling part 202 are provided with positioning grooves 8, and the positioning grooves 8 are used to embed the ends of the battery matrix. It can be understood that on the premise that the plug nozzle 6 provides the initial positioning effect for the battery cell 1, the individual size of the plug nozzle 6 is generally smaller than that of the battery cell 1, so that the positioning effect on the battery cell 1 is generally not ideal, that is, the battery cell 1 still has a certain small-range active area on the premise that the plug nozzle 6 and the hollow cavity of the battery cell 1; therefore, in the present embodiment, by providing the positioning groove 8, the positioning groove 8 can provide a positioning effect for the battery cell 1 when the battery matrix is assembled with the upper cooling portion 201 and the lower cooling portion 202, and maintain the position of the battery cell 1 at the positioning groove 8, that is, can provide a certain limiting effect on the basis of providing the positioning effect; at the same time, a certain tolerance space can be provided for the plug connector 6, i.e. the position of the plug connector 6 on the first hollow plate 2012 and the second hollow plate 2022 can be allowed to have a certain position error during processing.

Preferably, in the present embodiment, the depth of the positioning groove 8 is 2-5 times the thickness of the end cap of the battery cell 1. It can be understood that, based on the above-mentioned function of the positioning groove 8 for positioning and limiting, the positioning groove 8 can be used for positioning and limiting, i.e. the greater the contact area between the positioning groove 8 and the side wall 103 of the battery cell 1, the better the positioning and limiting effect of the positioning groove 8 on the battery cell 1, and meanwhile, based on the consideration of processing cost, the size of the first hollow plate 2012 and the second hollow plate 2022 increases along with the increase of the contact area between the positioning groove 8 and the battery cell 1, so in this embodiment, the depth range of the positioning groove 8 is preferably 2-5 times the thickness of the end cover of the battery cell 1.

Specifically, in this embodiment, the upper cooling portion 201 is further provided with a wire groove 9. It can be understood that the end of the battery cell 1 is provided with a wiring, and if the wiring is led out directly from the battery cells 1, the wiring may be too disordered and interference phenomenon may occur easily, so in this embodiment, the wiring grooves 9 are provided, so that the wiring of the battery matrix can be arranged along the wiring grooves 9, thereby improving the space compactness of the battery module.

Specifically, referring to fig. 8, in the present embodiment, the side cooling part 203 includes a plurality of side cooling plates 2031, each side cooling plate 2031 being sandwiched between adjacent rows or columns of battery cells 1, each side cooling plate 2031 having a cavity that accommodates a cooling medium. It can be appreciated that, by sandwiching each side cooling plate 2031 between adjacent rows or columns of battery cells 1, each side wall 103 of each battery cell 1 can have a certain contact area with the side cooling plate 2031, so that each side wall 103 of each battery cell 1 can be cooled, thereby improving the cooling effect of the entire battery module. It can be seen that both ends of the side cooling plate 2031 are provided with the inflow and outflow ports 2033, respectively, in consideration of the circulation of the cooling medium and the reduction of the space of the entire battery module as much as possible.

Specifically, in the present embodiment, arc grooves 2032 are provided on both side walls of the side cooling plate 2031 that are in contact with the battery cell 1, and the arc grooves 2032 are attached to the side walls 103 of the battery cell 1. It can be appreciated that the arc-shaped groove 2032 in the embodiment can provide a certain positioning effect for the battery cell 1 on one hand, and can further improve the cooling effect on the side wall 103 of the battery cell 1 because the side wall 103 of the battery cell 1 is arc-shaped and the contact area between the arc-shaped groove 2032 and the side wall 103 of the battery cell 1 can be larger on the other hand. It will be appreciated that the fit of the arcuate slot 2032 to the side wall 103 of the battery cell 1 may also be interpreted as a shape fit of the arcuate slot 2032 to the side wall 103 of the battery cell 1.

Specifically, in the present embodiment, the arc-shaped grooves 2032 on both side walls of the side cooling plate 2031 are alternately arranged along the arrangement direction of the arc-shaped grooves 2032. It can be understood that in the present embodiment, by alternately arranging the arc-shaped grooves 2032, the battery cells 1 corresponding to the arc-shaped grooves 2032 can be made more compact when constituting the battery matrix than when using a symmetrical arrangement. Of course, in other embodiments, the arc-shaped grooves 2032 may be symmetrically arranged.

Preferably, on the basis that the above-mentioned arc-shaped grooves 2032 are alternately arranged in the arrangement direction of the arc-shaped grooves 2032, projection portions of the arc-shaped grooves 2032 on both side walls of the side cooling plate 2031 on the end face of the side cooling plate 2031 overlap, that is, the depth of the arc-shaped grooves 2032 may be made larger than half or more of the thickness of the side cooling plate 2031. It can be appreciated that by this arrangement, the thickness of the side cooling plates 2031 can be reduced as much as possible on the basis of satisfying the alternate arrangement of the arc-shaped grooves 2032, so that the compactness of the battery matrix can be improved, and the overall space occupation of the individual battery modules can be reduced. Fig. 9A, 9B, and 9C illustrate, for example, the case where the arc grooves 2032 are symmetrically arranged, the arc grooves 2032 are alternately arranged, and the projected portions of the arc grooves 2032 on the end surface of the side cooling plate 2031 are overlapped, respectively.

Preferably, as shown in fig. 8, the end portions of the side cooling plates 2031 are arranged in a triangular structure, and the tip portions are used for providing the circulation ports 2033. It can be appreciated that since the end of the side cooling plate 2031 is not normally in contact with the battery cell 1 and is mainly used for the purpose of inputting the cooling medium, by arranging the end of the side cooling plate 2031 in a delta-shaped structure, the space of the end of the side cooling plate 2031 is reduced so that the cooling medium can flow more quickly to the portion in contact with the side wall 103 of the battery cell 1, rather than diverting a portion for filling the end of the side cooling plate 2031, whereby the cooling speed of the cooling medium to the side wall 103 of the battery cell 1 can be improved. It should be noted that providing the end portion of the side cooling plate 2031 in a triangular shape is only a preferred choice in the present embodiment, and the side cooling plate 2031 may be adaptively provided in a circular arc shape or the like for different usage scenarios.

Example two

Referring to fig. 10, a battery module is disclosed in the present embodiment, which is different from the above-described embodiment in that: the plurality of battery cells 1 are arranged in a matrix form into a plurality of groups, the plurality of groups of battery cells 1 are stacked, and meanwhile, the upper cooling part 201 or the lower cooling part 202 between two adjacent groups of battery cells 1 are spaced, so that both end parts of the battery cells 1 can be cooled. In order to realize the circulation of the cooling medium, the upper cooling part 201 or the lower cooling part 202 for spacing the adjacent two groups of battery cells 1 are provided with the plug-in connectors 6 on the contact surfaces of the upper cooling part or the lower cooling part and the two groups of battery cells 1, so that the circulation of the cooling medium among the groups of battery cells 1 can be realized.

Example III

The embodiment discloses a battery pack, which comprises a plurality of battery modules in the first embodiment or the second embodiment, wherein the plurality of battery modules are stacked in parallel and/or in series.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The battery module comprises battery cells (1) and a shell (2) for loading the battery cells (1), and is characterized in that the battery cells (1) are hollow batteries, a plurality of the battery cells (1) are arranged in a matrix form into one group or a plurality of groups, the shell (2) comprises an upper cooling part (201), a lower cooling part (202) and a side cooling part (203), and the side cooling part (203) is supported between the upper cooling part (201) and the lower cooling part (202);

the upper cooling part (201), the lower cooling part (202) and the side cooling part (203) are respectively contacted with the upper ends (101), the lower ends (102) and the side walls (103) of the battery cells (1) which are arranged in a matrix manner and fixedly seal the battery cells (1) in the shell (2), and cavities for accommodating cooling mediums are respectively arranged in the upper cooling part (201), the lower cooling part (202) and the side cooling part (203);

the upper cooling part (201) and the lower cooling part (202) are respectively provided with a plug-in nozzle (6), and the plug-in nozzles (6) are correspondingly and hermetically plugged in the hollow cavity of the battery cell (1).

2. The battery module according to claim 1, wherein the upper cooling part (201) comprises an upper cover plate (2011), a first hollow plate (2012) snapped together with the upper cover plate (2011);

the lower cooling part (202) comprises a lower cover plate (2021) and a second hollow plate (2022) buckled with the lower cover plate (2021);

the first hollow plate (2012) and the second hollow plate (2022) are each provided with a cavity.

3. The battery module according to claim 2, wherein the first hollow plate (2012) and the second hollow plate (2022) are each provided with an input end (3) and an output end (4) through which the cooling medium flows;

and recess (5) matched with input end (3) or output end (4) are arranged on upper cover plate (2011) and lower cover plate (2021), when upper cover plate (2011) and first hollow plate (2012), lower cover plate (2021) and second hollow plate (2022) are buckled together, input end (3) and output end (4) are embedded in recess (5).

4. The battery module according to claim 1, wherein at least one sealing ring (7) is arranged on the plug connector (6), the sealing ring (7) is sleeved along the axial spacing of each plug connector (6), and the sealing ring (7) is in interference fit with the inner wall of the hollow cavity.

5. The battery module according to claim 1, wherein the upper cooling part (201) and the lower cooling part (202) are each provided with a positioning groove (8), and the positioning grooves (8) are used for embedding the end portions of the battery cells (1).

6. The battery module according to any one of claims 1 to 5, wherein the side cooling part (203) comprises a plurality of side cooling plates (2031), each side cooling plate (2031) is sandwiched between adjacent rows or columns of the battery cells (1), a plurality of arc grooves (2032) are provided on both side walls of each side cooling plate (2031) that are in contact with the battery cells (1), and each arc groove (2032) is bonded to a side wall (103) of the battery cell (1).

7. The battery module according to claim 6, wherein the arc-shaped grooves (2032) on both side walls of the side cooling plates (2031) are alternately arranged along the arrangement direction of the arc-shaped grooves (2032).

8. The battery module according to claim 7, wherein the depth of the arc-shaped groove (2032) is greater than half or more of the thickness of the side cooling plate (2031).

9. A battery pack comprising a plurality of battery modules according to any one of claims 1 to 8, wherein a plurality of the battery modules are stacked in parallel and/or in series.