CN218957971U - Battery module and vehicle - Google Patents

Abstract

The application provides a battery module and a vehicle. The battery module comprises a single battery. The single battery comprises a first pole and a second pole. The number of the single batteries is plural along the first direction. The plurality of unit cells are connected in series to form a battery pack. The number of the battery packs is plural. The plurality of battery packs are arranged side by side along the second direction. Two single cells connected in series in the battery pack are adjacent. The first pole of one single battery is directly connected with the second pole of the other single battery. The battery module can solve the problem that the arrangement among a plurality of single batteries is unreasonable, so that the energy density of the battery module is reduced and the overcurrent capacity is limited.

Description

Battery module and vehicle

Technical Field

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

Background

With the progress of economic globalization and the massive use of fossil fuels, the problems of environmental pollution and energy shortage are increasingly receiving attention. Searching for new energy storage devices has become a research hotspot in the new energy-related field. The battery is rapidly developed into a new generation of energy storage equipment by virtue of the advantages of high energy density, low self-discharge, good cycle performance, no memory effect and the like, and is used for power support in the fields of information technology, electric vehicles, aerospace and the like.

The plurality of single batteries can be electrically connected and then placed in the same frame to form a battery module. In the related art, a plurality of single batteries are unreasonably distributed, so that larger space is easily occupied, and the phenomenon of lower energy density of the battery module is easily caused.

Disclosure of Invention

The application provides a battery module and vehicle can solve and arrange unreasonable between a plurality of battery cells, leads to the problem that battery module's energy density reduces.

In one aspect, the present application provides a battery module, which includes:

the single battery comprises a first pole and a second pole;

the number of the single batteries is plural along the first direction, the plurality of the single batteries are connected in series to form a battery pack, the number of the battery packs is plural, the plurality of the battery packs are arranged side by side along the second direction,

two single batteries which are connected in series in the battery pack are adjacent, wherein a first pole of one single battery is directly connected with a second pole of the other single battery.

The application provides a battery module, a plurality of battery cells can be arranged in proper order along two directions to reduce along the space that occupies in a specific direction. Two monomer batteries connected in series are adjacently arranged and directly connected. Therefore, the shorter connecting path between the two single batteries can effectively reduce the resistance, thereby being beneficial to improving the overcurrent capacity between the two single batteries.

Meanwhile, in the two single batteries which are connected in series in the battery pack, the first pole of one single battery and the second pole of the other single battery can be directly and electrically connected. That is, no conductive connector such as a switching piece is arranged between two adjacent single batteries. Therefore, the utilization rate of the internal space of the battery pack can be effectively improved, so that on one hand, the capacity density of the battery pack is improved, and on the other hand, the overall size of the battery pack can be effectively reduced.

According to one embodiment of the application, the battery module comprises a connecting sheet, and in two adjacent battery packs along the second direction, the tail end of one battery pack is correspondingly arranged with the tail end of the other battery pack, and two single batteries at the tail end are connected through the connecting sheet.

According to one embodiment of the present application, a plurality of unit cells are arranged side by side along a first direction, and of two adjacent unit cells of a battery pack, a first pole of one unit cell and a second pole of the other unit cell are connected to two surfaces opposite to each other.

According to one embodiment of the present application, the orthographic projections of the outer contours of the plurality of unit cells coincide with each other in the first direction, and the orthographic projections of the outer contours of the plurality of battery packs coincide with each other in the second direction.

According to one embodiment of the present application, in the second direction, insulation is provided between two opposing surfaces of two adjacent battery packs.

According to one embodiment of the application, the single battery comprises a housing, the housing comprises two openings along a first direction, the first pole and the second pole are respectively closed to form an accommodating space, and the first pole, the second pole and the housing are enclosed.

According to one embodiment of the present application, along the first direction, the front projection of the first pole and the front projection of the second pole are both located inside the front projection of the housing.

According to one embodiment of the present application, the outer contour of the first pole coincides with the outer contour of the housing, and the outer contour of the second pole coincides with the outer contour of the housing.

According to one embodiment of the application, the first pole and the second pole are respectively connected with the shell in an insulating way;

alternatively, one of the first pole and the second pole is connected to the housing in an insulating manner, and the other is connected to the housing in an electrical manner.

On the other hand, the application provides a vehicle, and the vehicle comprises the battery module of any embodiment. The application provides a battery module, a plurality of battery cells can be arranged in proper order along two directions to reduce along the space that occupies in a specific direction. Two monomer batteries connected in series are adjacently arranged and directly connected. Therefore, the shorter connecting path between the two single batteries can effectively reduce the resistance, thereby being beneficial to improving the overcurrent capacity between the two single batteries.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

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

fig. 2 is a schematic top view of a battery module according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a single battery according to an embodiment of the present disclosure;

FIG. 4 is an enlarged schematic view of FIG. 2 at A;

fig. 5 is a schematic view illustrating a partial structure of a battery module according to an embodiment of the present application;

FIG. 6 is an enlarged schematic view at B in FIG. 5;

fig. 7 is an exploded view of a battery cell according to an embodiment of the present disclosure;

fig. 8 is a schematic partial structure of a single battery according to an embodiment of the present application.

Reference numerals illustrate:

10. a battery module;

100. a battery pack;

110. a single battery;

110a, an accommodation space;

111. a first pole;

112. a second post;

113. a housing;

114. a battery cell;

115. an insulating film;

116. a bleed passage plate;

117. an explosion-proof valve;

120. a connecting sheet;

200. a liquid cooling plate assembly; 210. a liquid cooling plate; 211. an insulating layer;

x, a first direction;

y, second direction;

z, third direction.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

The unit cell 110 of the embodiment of the present application may include a lithium ion secondary battery, a lithium sulfur battery, a sodium lithium ion battery, or the like. The battery 100 of the embodiment of the present application may be a solid-state battery or a semi-solid-state battery. And are not limited in this application. The unit cells 110 may be generally divided into square cells and pouch cells in a packaged manner. Illustratively, the battery cells 110 of the present application may be prismatic cells.

The battery module 10 of the present application can provide energy for vehicles, ships, small aircraft, and the like. Taking a vehicle as an example, the vehicle of the application can be a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile.

The battery module 10 may be used as a driving power source of an automobile to supply driving power to the automobile instead of or in part of fuel oil or natural gas. For example, the battery module 10 may supply power to the driving motor. The driving motor is connected with wheels on the vehicle through a transmission mechanism so as to drive the vehicle to travel. Specifically, the battery module 10 may be horizontally disposed at the bottom of the vehicle.

The battery module 10 includes a plurality of unit cells 110. The plurality of unit cells 110 may be electrically connected to form the battery module 10.

In the related art, a plurality of unit cells are electrically connected through a conductive adaptor. The arrangement of a plurality of single batteries is unreasonable, and a large space is easy to occupy, so that the phenomenon that the energy density of the battery module is influenced due to the low space utilization rate in the battery module is caused.

For example, a plurality of unit cells are arranged side by side only along one direction, which easily results in a large space occupied in this direction, and it is difficult to satisfy the application environment of the battery module.

Accordingly, based on the above-mentioned problems, the applicant has improved the structure of the battery module. In this application, the plurality of unit cells 110 may be sequentially arranged along two directions to reduce the space occupied along one specific direction. Two unit cells 110 connected in series with each other may be adjacently disposed.

On this basis, the applicant has also found that it is more advantageous to increase the energy density of the battery module 10 if the tabs electrically connecting the adjacent two unit cells 110 connected in series with each other are also eliminated.

The battery module 10 provided in the present application will be further described with reference to specific embodiments.

Referring to fig. 1 to 7, a battery module 10 of the embodiment of the present application includes a unit cell 110. The unit cell 110 includes a first pole 111 and a second pole 112. The first pole 111 and the second pole 112 may be opposite in polarity. The first and second poles 111 and 112 may be located at both ends of the unit cell 110, respectively, in the first direction X.

The number of unit cells 110 is plural along the first direction X. The plurality of unit cells 110 may be connected in series to form the battery pack 100. The number of the battery packs 100 is plural. The plurality of battery packs 100 are arranged side by side in the second direction Y.

Two unit cells 110 connected in series with each other in the battery pack 100 are disposed adjacent to each other. Wherein, the first pole 111 of one single cell 110 is directly connected with the second pole 112 of another single cell 110.

The present application describes specific embodiments using the example that the battery may be a prismatic battery. The first direction X may be a length direction of the unit cell 110. The second direction Y may be a thickness direction of the unit cell 110. The first direction X and the second direction Y are perpendicular to each other.

The plurality of unit cells 110 of the embodiment of the present application may be connected in series to form a plurality of battery packs 100. The plurality of battery packs 100 are connected in series with each other to form the battery module 10. The battery module 10 can collect the voltages of the plurality of unit cells 110, so as to provide energy for the device more permanently, rapidly and conveniently.

The plurality of unit cells 110 according to the embodiment of the present application may be sequentially arranged along two directions to reduce the space occupied along one specific direction. Two unit cells 110 connected in series with each other are disposed adjacent to each other and are directly connected. Therefore, the shorter connection path between the two unit cells 110 can effectively reduce the resistance, thereby being beneficial to improving the overcurrent capability between the two unit cells 110.

Meanwhile, in the two unit cells 110 connected in series in the battery pack 100, the first pole 111 of one unit cell 110 and the second pole 112 of the other unit cell 110 may be directly electrically connected. I.e., a conductive connector such as a tab is not provided between two adjacent unit cells 110. Therefore, the overall size of the battery pack 100 can be effectively reduced, so that the overall size of the battery module 10 can be correspondingly reduced, and the possibility that the battery module 10 occupies a large internal space within the device can be reduced.

In some examples, a space for accommodating the battery module 10 may be reserved in a device to which the battery module 10 may be applied. Under the condition that the space is kept unchanged, the two single batteries 110 connected in series with each other in the battery pack 100 are directly connected, and the space utilization rate in the battery module 10 can be improved, so that the size of the battery cell 114 can be correspondingly increased, and the energy density of the battery module 10 can be improved.

In some examples, the number of the unit cells 110 included in the battery pack 100 may be set according to the application environment of the battery module 10. The number of the unit cells 110 in the battery pack 100 according to the embodiment of the present application may be set according to the space reserved on the device for accommodating the battery module 10.

In some examples, the number of unit cells 110 within the plurality of battery packs 100 may be the same to form the regular structural shape of the battery module 10. Alternatively, the number of unit cells 110 in the plurality of battery packs 100 may be different to match the arrangement of other components in the device.

In some implementations, referring to fig. 2 and 4, the battery module 10 of the embodiments of the present application includes a connecting tab 120. In the second direction Y, the ends of one battery pack 100 are disposed corresponding to the ends of the other battery pack 100 in the adjacent two battery packs 100. The two unit cells 110 at the ends are connected by a connection piece 120.

In some examples, the second direction Y may be a thickness direction of the unit cell 110. Electrical conduction between two adjacent battery packs 100 can be performed through the connecting sheet 120.

In some examples, a plurality of unit cells 110 may first be connected in series in a first direction X to form the battery pack 100. And then the plurality of battery packs 100 are connected in series through the connection sheet 120.

Fig. 2 is a schematic top view of the battery module 10. Referring to the direction of fig. 2, the unit cells 110 positioned at the left side in the first row of the battery packs 100 and the unit cells 110 positioned at the left side in the second row of the battery packs 100 may be electrically connected by the connection pieces 120. The unit cells 110 located at the right side in the second row of the battery packs 100 and the unit cells 110 located at the right side in the third row of the battery packs 100 may be electrically connected by the connection pieces 120. And so on, so that the plurality of battery packs 100 are connected in series with each other to form the battery module 10.

In some examples, the connection tab 120 and the unit cell 110 may be connected using a welding process. The specific connection manner is not specifically limited in the embodiments of the present application.

In some implementations, as shown in fig. 5 and 6, a plurality of cells 110 are disposed side-by-side along the first direction X. Of the two unit cells 110 adjacent to the battery pack 100, the first post 111 of one unit cell 110 and the second post 112 of the other unit cell 110 are connected to opposite surfaces of each other.

In some examples, two surfaces of the first post 111 of one unit cell 110 and the second post 112 of another unit cell 110 opposite to each other may be attached to each other to increase an effective contact area of the first post 111 of one unit cell 110 and the second post 112 of another unit cell 110, thereby facilitating an increase in overcurrent capability between adjacent two unit cells 110.

In some examples, the first pole 111 of one cell 110 and the second pole 112 of the other cell 110 may be partially connected between two surfaces opposite to each other. Gaps can be formed in the areas where the two single batteries are not connected, so that when one single battery 110 is abnormal to generate larger heat, the gaps can effectively block heat transfer, the speed that the abnormal single battery 110 spreads the generated heat to the other single battery 110 adjacent to the abnormal single battery is reduced, and the possibility of faults of the battery module 10 caused by overhigh temperature can be reduced.

In some implementations, referring to fig. 6, the orthographic projections of the outer contours of the plurality of cells 110 coincide with each other along the first direction X. In the second direction Y, the orthographic projections of the outer contours of the plurality of battery packs 100 coincide with each other.

In some examples, the cell 110 of embodiments of the present application may be square in configuration.

When the same number of unit cells 110 are provided in each battery pack 100, the battery module 10 of a regular square structure may be formed.

In some implementations, in the second direction Y, two opposite surfaces of the adjacent two battery packs 100 are insulated from each other, so as to reduce the possibility that an abnormality occurs in one of the unit cells 110, which may cause a short circuit between the unit cells 110.

In some examples, referring to fig. 4, the battery module may further include a liquid cooling plate assembly 200. In the second direction, at least one side of the battery packs 100 may be provided with a liquid cooling plate assembly 200, and a liquid cooling plate assembly 200 is provided between adjacent two battery packs 100. The liquid cooling plate assembly 200 may be insulated from the battery pack 100.

The liquid cooling plate assembly 200 can be fully contacted with the battery pack 100 to improve the heat dissipation and cooling efficiency of the battery pack 100.

In some examples, referring to fig. 7, the outside of each unit cell 100 may be coated with an insulating film 115. A plurality of unit cells 100 may be connected in series in a first direction to form a battery pack 100. The liquid cooling plate assembly 200 may be glued to the battery pack 100.

Alternatively, a plurality of unit cells 100 are connected in series in the first direction to form the battery pack 100. The outer surface of the battery pack 100 may be coated with an insulating film 115. The liquid cooling plate assembly 200 may be glued to the battery pack 100.

Further, the plurality of unit cells 100 are connected in series in the first direction to form the battery pack 100. The liquid cooling plate assembly 200 may include a liquid cooling plate 210 and an insulating layer 211. The insulating layer 211 may cover the outer surface of the liquid cooling plate 210. Accordingly, the liquid cooling plate assembly 200 may be directly connected to the battery pack 100.

In some examples, the plurality of battery packs 100 are each provided with a liquid cooling plate assembly 200 therebetween, and form the battery module 10. An insulating material may be provided to both surfaces of the battery module 10 in the third direction Z.

In some examples, the third direction Z may be a width direction of the unit cell.

The insulating film may be a plastic film having insulating properties. Alternatively, an insulating film may be formed by coating the outer surface of the unit cell 110 or the battery pack 100 with an insulating paste. The present application is not particularly limited.

In some examples, a side surface of the unit cell 110 having the largest surface area may be in contact with the liquid cooling plate assembly 200 to improve the cooling efficiency of the unit cell 110.

In some implementations, referring to fig. 7, the cell 110 of an embodiment of the present application includes a housing 113. Along the first direction X, the housing 113 includes two openings. The first pole 111 and the second pole 112 close the two openings, respectively, and the first pole 111, the second pole 112 and the housing 113 enclose an accommodating space 110a.

The first pole 111 and the second pole 112 of the embodiment of the present application may be used to directly connect with the adjacent unit cells 110. The first and second poles 111 and 112 may be disposed at both ends of the case 113, respectively, to facilitate connection with the adjacent unit cells 110.

In some examples, the battery cells 110 may also include battery cells 114. The battery cell 114 may be placed into the receiving space 110a of the case 113 through one of the openings. At least one end of the cell 114 may lead out of the tab. The tab can be electrically connected to the first pole 111 or the second pole 112. For example, two opposite-polarity tabs may be led out from two ends of the battery cell 114 along the first direction X. The two tabs may be electrically connected to the first and second poles 111 and 112, respectively.

In some examples, the outer surface of the cell 114 may be provided with an insulating layer to reduce the likelihood of electrical conduction between the tab and the metal housing 113, resulting in shorting of the cell 110.

In some examples, the cells 114 may be wound cells or laminated cells. Alternatively, the battery cell 114 may be a battery cell formed by combining a winding process and a lamination process. And are not limited in this application.

In some implementations, referring to fig. 6 and 8, in a first direction X, the front projection of the first pole 111 and the front projection of the second pole 112 are both located inside the front projection of the housing 113.

Along the first direction X, if the front projection of the outer contour of the first pole 111 and the front projection of the outer contour of the second pole 112 exceed the front projection of the outer contour of the housing 113, when the plurality of unit cells 110 are electrically connected through the respective first pole 111 and second pole 112 to form the battery pack 100, the first pole 111 and the second pole 112 easily occupy the outer space of the battery pack 100 along the second direction Y, so as to affect the series connection of the plurality of battery packs 100 along the second direction Y. The embodiment of the application can effectively solve the above problems, reduce the possibility that the first pole 111 and the second pole 112 occupy the internal space of the battery module 10 and affect the energy density of the battery module 10.

In some implementations, referring to fig. 8, the outer contour of the first pole 111 coincides with the outer contour of the housing 113. The outer contour of the second post 112 coincides with the outer contour of the housing 113.

The surface of the first pole 111 facing away from the battery cell 114 in the embodiment of the present application may be used for electrical connection with other unit cells 110. Along the first direction X, the orthographic projection of the outer contour of the first pole 111 may coincide with the orthographic projection of the outer contour of the case 113 to achieve maximization of the first pole 111, so that the overcurrent capability of the battery may be improved.

Accordingly, the orthographic projection of the outer contour of the second post 112 may coincide with the orthographic projection of the outer contour of the housing 113 along the first direction X to maximize the second post 112.

Therefore, the two unit cells 110 connected in series with each other in the battery pack 100, the first post 111 of one unit cell 110 and the second post 112 of the other unit cell 110 are directly electrically connected. Since the first and second poles 111 and 112 can be maximally disposed, the over-current capability between the unit cells 110 can be improved, which is advantageous for improving the rapid charge and discharge of the battery module 10.

In addition, after the plurality of unit batteries 110 are electrically connected to form the battery module 10, when data information such as voltage of the battery needs to be collected through the first pole 111 or the second pole 112, the collection sheet can be easily connected with the first pole 111 or the second pole 112 from the outside of the housing 113, thereby being beneficial to improving the assembly efficiency of the unit batteries 110.

In some examples, the acquisition sheet of embodiments of the present application may be disposed on one side of the unit cell 110 along the third direction Z.

In some implementations, the first pole 111 and the second pole 112 may be respectively connected with the housing 113 in an insulating manner. The housing 113 has no electrical property. The first pole 111 and the second pole 112 may have opposite polarities, respectively.

In some examples, an insulating assembly may be disposed between the first pole 111 and the housing 113. The insulation assembly may insulate the first pole 111 from the housing 113.

In some examples, the insulation assembly may have a better strength and rigidity, and is not itself susceptible to deformation. Illustratively, the material of the insulating component may be plastic.

In some examples, the insulation assembly may include a plurality of insulation members. The plurality of insulating members may be of a split structure or an integrally injection-molded structure. And are not limited in this application.

In some implementations, one of the first pole 111 and the second pole 112 is connected with the housing 113 in an insulating manner, and the other is electrically connected with the housing 113.

In the embodiment of the present application, the housing 113 may be equipotential with one of the first pole 111 or the second pole 112. For example, the first pole 111 may be electrically connected with the housing 113, and the second pole 112 may be electrically connected with the housing 113, so that the first pole 111 is equipotential with the housing 113. I.e., the first pole 111 has the same polarity as the housing 113.

In some examples, when data information such as voltage of the unit cell 110 needs to be collected through the first pole 111 or the second pole 112, the collecting piece may be directly connected to the housing 113 because the housing 113 may be equipotential with the first pole 111 or the second pole 112. The case 113 has a large contact area so that the collecting tab can be easily connected to the case 113 to collect the voltage of the unit cell 110.

The embodiment of the application also provides a vehicle. The vehicle may be provided with the battery module 10 in the above-described embodiment. The battery module 10 may provide power to the vehicle.

In some examples, the cell 110 may also include a vent passage plate 116 and an explosion proof valve 117. Vent passage plate 116 may be located inside housing 113. The explosion proof valve 117 may be located outside the housing 113. Vent passage plate 116 and explosion vent valve 117 may be provided in correspondence. The bleed passage plate 116 may be used to support the battery cell 114 so that there may be a gap between the battery cell 114 and the inner wall of the housing 113 so that when a battery abnormality occurs, the battery cell 114 is less likely to block the explosion proof valve 117, resulting in failure of the explosion proof valve 117.

In some examples, the battery module 10 may be located at the bottom of the vehicle.

In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The embodiments or implications herein must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the embodiments herein. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless specifically stated otherwise.

The terms first, second, third, fourth and the like in the description and in the claims of embodiments of the application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the present application described herein may be implemented, for example, in sequences other than those illustrated or described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The term "plurality" herein refers to two or more. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship; in the formula, the character "/" indicates that the front and rear associated objects are a "division" relationship.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application.

It should be understood that, in the embodiments of the present application, the sequence number of each process described above does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims (10)

1. A battery module, comprising:

the battery cell comprises a first pole and a second pole;

the number of the single batteries is plural along the first direction, the single batteries are connected in series to form a battery pack, the number of the battery packs is plural, the battery packs are arranged side by side along the second direction,

two single batteries which are connected in series in the battery pack are adjacent, wherein the first pole of one single battery is directly connected with the second pole of the other single battery.

2. The battery module according to claim 1, comprising a connecting piece, wherein in the second direction, the ends of two adjacent battery packs are disposed corresponding to the ends of the other battery pack, and two unit cells at the ends are connected by the connecting piece.

3. The battery module according to claim 1, wherein a plurality of the unit cells are arranged side by side in the first direction, and the first post of one of the unit cells and the second post of the other unit cell are connected to each other at two surfaces opposite to each other, of the two unit cells adjacent to the battery pack.

4. The battery module according to claim 3, wherein the orthographic projections of the outer contours of the plurality of unit cells coincide with each other in the first direction, and the orthographic projections of the outer contours of the plurality of battery packs coincide with each other in the second direction.

5. The battery module according to any one of claims 1 to 4, wherein, in the second direction, two surfaces of the adjacent two battery packs opposing each other are insulated from each other.

6. The battery module according to any one of claims 1 to 4, wherein the unit cell includes a case, the case includes two openings along the first direction, the first and second poles respectively close the two openings, and the first, second and case enclose to form an accommodation space.

7. The battery module of claim 6, wherein the front projection of the first post and the front projection of the second post are both located inside the front projection of the housing along the first direction.

8. The battery module of claim 7, wherein the outer contour of the first post coincides with the outer contour of the housing and the outer contour of the second post coincides with the outer contour of the housing.

9. The battery module according to claim 7, wherein the first and second poles are respectively connected with the case in an insulating manner; alternatively, one of the first pole and the second pole is connected with the housing in an insulating manner, and the other is connected with the housing in an electrical manner.

10. A vehicle, characterized by comprising: the battery module according to any one of claims 1 to 9.

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