CN115911761A - Battery module and vehicle - Google Patents

Abstract

The application provides a battery module and a vehicle. The battery module includes a plurality of battery cells. The single battery comprises a shell, a battery core, a first pole and a second pole. The battery core is located inside the shell. Along the first direction, the shell comprises a first opening and a second opening which are oppositely arranged. The first pole column and the second pole column respectively seal the first opening and the second opening. The battery cell comprises a first tab and a second tab. The first tab is electrically connected with the first pole. The second tab is electrically connected with the second pole column. Wherein, a plurality of monomer batteries are consecutive along first direction. And a heat insulation gap is formed between two surfaces of the first pole column of one single battery and the second pole column of the other single battery, which are opposite to each other. The battery module of this application can delay the problem that the heat between the battery cell stretchs in the battery module.

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 heavy use of fossil fuels, the problems of environmental pollution and energy shortage are receiving increasing attention. The search for new energy storage devices has become a research hotspot in the related field of new energy. 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 battery module may include a plurality of unit batteries. In the operation process of the single battery, phenomena such as internal resistance increase and lithium metal deposition may occur inside the battery core. The risk of thermal runaway will gradually increase over time. In addition to the factors that affect the use of the electrical core, other factors such as water immersion, thermal shock, vibration, overcharge and overdischarge may also cause thermal runaway. In the battery module system, when a thermal runaway phenomenon occurs in one unit cell, the thermal runaway may spread to adjacent unit cells and the surrounding environment due to a heat transfer phenomenon.

Disclosure of Invention

The application provides a battery module and vehicle can delay the problem that heat between the battery cell spreads in the battery module.

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

the battery cell comprises a shell, a battery cell, a first pole column and a second pole column, wherein the battery cell is positioned inside the shell, the shell comprises a first opening and a second opening which are oppositely arranged along a first direction, the first pole column and the second pole column respectively seal the first opening and the second opening, the battery cell comprises a first pole lug and a second pole lug, the first pole lug is electrically connected with the first pole column, and the second pole lug is electrically connected with the second pole column;

the plurality of single batteries are sequentially connected along a first direction, and a heat insulation gap is formed between two opposite surfaces of the first pole of one single battery and the second pole of the other single battery.

The application provides a battery module, mutual electric connection's first utmost point post and second utmost point post can form thermal-insulated clearance between two surfaces relative to each other. Therefore, the surfaces of the first pole post and the second pole post opposite to each other can be in incomplete contact, so that the contact area between the first pole post and the second pole post is reduced, and the heat transfer is favorably slowed down.

Consequently, thermal-insulated clearance can reduce the heat that adjacent battery cell received, is favorable to slowing down heat and spreads, and then can reduce the battery module overall temperature and too high and lead to causing the possibility of loss.

According to one embodiment of the application, the first pole post is provided with a first concave portion, in two adjacent single batteries, part of the second pole post of one single battery is located in the first concave portion of the first pole post of the other single battery, and a heat insulation gap is formed between the surface of the second pole post of one single battery facing the other single battery and the bottom wall of the first concave portion of the first pole post of the other single battery.

According to an embodiment of the application, a cross-sectional shape of a portion of the second pole post located within the first recess matches a cross-sectional shape of the first recess, the cross-section being perpendicular to the first direction.

According to an embodiment of the application, between the first pole post and the second pole post connected, the second pole post has a first end facing the first pole post, the first end is provided with a chamfer, and the cross-sectional area of the first recess of the first pole post is gradually reduced, the cross-section being perpendicular to the first direction.

According to one embodiment of the application, between the first utmost point post and the second utmost point post that connect, the first utmost point post has the second end towards the second utmost point post, and the second end is provided with the chamfer.

According to one embodiment of the application, the first pole post is provided with a second concave portion, an orthographic projection of the second concave portion is located inside an orthographic projection of the second pole post along the first direction, a heat insulation gap is formed between the surface, facing the first pole post, of the second pole post and the bottom wall of the second concave portion between the connected first pole post and the second pole post.

According to an embodiment of the application, along the first direction, an orthographic projection of the outer contour of the first pole is arranged close to an orthographic projection of the outer contour of the housing, and/or;

the orthographic projection of the outer contour of the second pole is close to the orthographic projection of the outer contour of the shell.

According to an embodiment of the present application, the battery module further includes a heat insulating member located inside the heat insulating gap.

According to one embodiment of the application, the cross-sectional shape of the thermal insulation element matches the cross-sectional shape of the insulation gap.

In another aspect, the present application provides a vehicle including the battery module of any one of the above embodiments. The battery module may provide power to a driving motor of the vehicle. The driving motor can be connected with wheels on the vehicle through a transmission mechanism so as to drive the vehicle to move.

In the battery module of this application, can form thermal-insulated clearance between mutual electrically connected's first utmost point post and the relative two surfaces of second utmost point post each other to can reduce the area of mutual contact between first utmost point post and the second utmost point post, be favorable to slowing down the heat transfer. Consequently, thermal-insulated clearance can reduce the heat that adjacent battery cell received, is favorable to slowing down heat and stretchs, and then can reduce the battery module bulk temperature and too high the possibility that leads to influencing battery module working property, is favorable to reducing latent potential safety hazard.

In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems that can be solved by the battery module and the vehicle provided by the embodiments of the present application, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

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

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

fig. 2 is a schematic structural diagram of a single battery according to an embodiment of the present application;

fig. 3 is an exploded view of a single battery according to an embodiment of the present disclosure;

fig. 4 is a schematic partial sectional view illustrating a battery module according to an embodiment of the present disclosure;

fig. 5 is a partial sectional view illustrating a battery module according to another embodiment of the present application;

fig. 6 is a schematic partial sectional view illustrating a battery module according to another embodiment of the present disclosure;

fig. 7 is a schematic partial sectional view illustrating a battery module according to still another embodiment of the present disclosure.

Description of reference numerals:

10. a battery module;

10a, a heat insulation gap;

10b, accommodating grooves;

100. a single battery;

110. a housing;

120. an electric core;

121. a first tab;

122. a second tab;

130. a first pole column;

130a, a first recess;

130b, a second recess;

131. a second end portion;

140. a second pole;

141. a first end portion;

200. a thermal insulation member;

x, a first direction;

y, a second direction;

z, third direction.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.

Detailed Description

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

The unit battery 100 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 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 cell 100 may be generally classified into a square unit cell and a pouch unit cell in a packaging manner. Illustratively, the unit cell 100 of the present application may be a square unit cell.

A plurality of the unit batteries 100 of the present application may be connected in series to form the battery module 10, so that energy may be supplied to a vehicle, a ship, a small airplane, or the like. Taking a vehicle as an example, the vehicle of the present application may be a new energy automobile. The new energy automobile can be a pure electric automobile, and also can be a hybrid electric automobile or a range-extended automobile.

The battery module 10 can be used as a driving power supply of an automobile to replace or partially replace fuel oil or natural gas to provide driving power for the automobile. 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 move. Specifically, the battery module 10 formed by connecting a plurality of unit batteries 100 in series may be horizontally disposed at the bottom of the vehicle.

The unit battery 100 includes a cell 120. The battery cell 120 includes a positive plate, a separator, and a negative plate. The positive electrode sheet, the separator, and the negative electrode sheet may be formed into the winding type battery cell 120 by a winding process.

Alternatively, the positive plate, the separator, the negative plate and the separator may be stacked in sequence to form the laminated battery cell 120.

Alternatively, the positive electrode sheet, the separator, and the negative electrode sheet may form the battery cell 120 by a winding process combined with a lamination process.

Take the example that the unit cell 100 may be a lithium ion battery. The unit cell 100 is mainly charged and discharged by movement of lithium ions between the positive and negative electrode tabs. During the charging process of the unit cell 100, lithium ions may be deintercalated from the positive electrode sheet and then may be deintercalated into the negative electrode sheet through the separator.

The battery module 10 may include a plurality of unit batteries 100. During the operation of the single battery 100, phenomena such as internal resistance increase and lithium metal deposition may occur inside the battery cell 120. The risk of thermal runaway gradually increases as time accumulates. In addition to the factors that affect the use of the battery cell 120, other factors such as water immersion, thermal shock, vibration, overcharge, overdischarge, and the like may also cause thermal runaway.

In the related art, a plurality of cooling structures are designed in the battery module, so that the battery module can be effectively subjected to heat conduction treatment when thermal runaway occurs, and further occurrence of large-area thermal runaway is delayed.

For example, the battery module may be provided with a liquid cooling plate. The liquid cooling plate may be in contact with the unit batteries 100 to achieve large-area cooling heat dissipation of the unit batteries 100.

However, the applicant has found that, in a battery module system, when a thermal runaway phenomenon occurs in one unit cell, the thermal runaway may spread to adjacent unit cells and the surrounding environment due to a heat transfer phenomenon, and a cooling mode such as a liquid cooling plate is difficult to achieve an effect of slowing down heat transfer between a plurality of unit cells.

Based on the above problems, the applicant has improved the existing battery module. In the battery module 10 of the present application, the thermal insulation gap 10a can be formed between two surfaces of the first electrode post 130 and the second electrode post 140 that are electrically connected to each other, so that the area of mutual contact between the first electrode post 130 and the second electrode post 140 can be reduced, which is beneficial to reducing heat transfer. Therefore, the heat insulation gap can reduce the heat received by the adjacent single batteries 100, which is beneficial to slowing down the heat spreading, and further can reduce the possibility that the working performance of the battery module 10 is influenced due to the overhigh temperature of the whole battery module 10, and is beneficial to reducing potential safety hazards.

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

Referring to fig. 1 to 5, a battery module 10 according to an embodiment of the present disclosure includes a plurality of unit batteries 100.

The unit battery 100 includes a case 110, a battery cell 120, a first pole post 130, and a second pole post 140. Referring to fig. 2 and 3, the battery cell 120 may be located inside the casing 110. Along the first direction X, the housing 110 may include a first opening and a second opening that are oppositely disposed. The first and second pole posts 130 and 140 enclose the first and second openings, respectively. The battery cell 120 includes a first tab 121 and a second tab 122. The first tab 121 is electrically connected to the first pole column 130. The second pole ear 122 is electrically connected to the second pole post 140.

Wherein the plurality of unit batteries 100 are sequentially connected along the first direction X. Referring to fig. 4 and 5, an insulation gap 10a is formed between two surfaces of the first pole 130 of one unit cell 100 and the second pole 140 of the other unit cell 100 facing each other.

The insulating gap 10a may be formed between two surfaces of the first pole post 130 and the second pole post 140 electrically connected to each other, which are opposite to each other. Therefore, the surfaces of the first pole post 130 and the second pole post 140 facing each other may not be in complete contact with each other, so as to reduce the contact area between the first pole post 130 and the second pole post 140, which is beneficial to slow down the heat transfer.

Therefore, the heat insulation gap 10a can obstruct heat generated by one single battery 100 from being transferred to the adjacent single battery 100 electrically connected with the single battery 100, so that the heat received by the adjacent single battery 100 can be reduced, the heat spreading can be favorably slowed down, and the possibility of loss caused by overhigh temperature of the whole battery module 10 can be reduced.

In some examples, two adjacent unit batteries 100 may be directly connected to each other. That is, no other adapter parts need to be arranged between the first pole 130 of one unit battery 100 and the second pole 140 of another unit battery 100, so as to improve the overcurrent capacity between the unit batteries 100.

In some realizable ways, referring to fig. 4, the first pole 130 of the present embodiments is provided with a first recess 130. In two adjacent single batteries 100, a part of the second pole 140 of one single battery 100 can be located in the first concave portion 130 of the first pole 130 of the other single battery 100. The surface of the second pole 140 of one unit cell 100 facing the other unit cell 100 and the bottom wall of the first recess 130 of the first pole 130 of the other unit cell 100 form an insulating gap 10a.

Between the first pole post 130 and the second pole post 140 electrically connected to each other, a portion of the second pole post 140 may be located in the first concave portion 130 of the first pole post 130. Therefore, the circumferential surface of the second pole 140 may be connected to the inner sidewall of the first recess 130 to achieve electrical conduction between the two unit batteries 100.

Along the first direction X, an insulating gap 10a may be formed between a surface of the second terminal post 140 facing the first terminal post 130 and a bottom wall of the first recess 130 to reduce a possibility of heat transfer to the unit battery 100 electrically connected thereto.

In some examples, the dimension of the thermal gap 10a along the first direction X, if set to be smaller, may easily affect the effect of heat diffusion, thereby easily causing the thermal gap 10a to fail. If the size of the heat insulating gap 10a is set large, the internal space of the battery module 10 in the first direction X is easily occupied.

Therefore, it can be understood that the size of the heat insulation gap 10a in the first direction X may be designed according to the comprehensive factors of the inner space of the battery module 10, the overcurrent capacity, and the like. And is not particularly limited in this application.

In some realizable manners, referring to fig. 4, the cross-sectional shape of the portion of the second pole 140 located within the first recess 130 matches the cross-sectional shape of the first recess 130, the cross-section being perpendicular to the first direction X.

The circumferential surface of the second pole 140 located in the first concave portion 130 may be tightly connected to the inner sidewall of the first concave portion 130, so as to realize electrical conduction between the two single batteries 100, which is beneficial to improving the connection reliability between the first pole 130 and the second pole 140, and reducing the occurrence of movement between the first pole 130 and the second pole 140 along the second direction Y and the third direction Z, thereby affecting the connection stability between the first pole 130 and the second pole 140.

In some examples, the housing 110 of the present embodiments is a square structure. The first direction X may be a length direction of the housing 110. The second direction Y may be a thickness direction of the housing 110. The third direction Z may be a width direction of the case 110.

In some examples, in two adjacent single batteries 100, the first pole 130 of one single battery 100 and the second pole 140 of the other single battery 100 may be connected by welding, riveting or bonding, which is not limited in this application.

In some realizable forms, see fig. 3 and 4, between the connected first pole post 130 and second pole post 140, the second pole post 140 has a first end 141 facing the first pole post 130. The first end portion 141 is provided with a chamfer, and the cross-sectional area of the first recess 130 of the first pole 130 gradually decreases, the cross-section being perpendicular to the first direction X.

In some examples, the first end 141 may be provided with a chamfer and the side wall of the first recess 130 may be provided with an oblique angle. Therefore, when the second pole post 140 is inserted into the first recess 130 of the first pole post 130, the thermal insulation gap 10a is formed between the surfaces of the first pole post 130 and the second pole post 140 facing each other after the first pole post 130 and the second pole post 140 are relatively fixed in the first direction X.

In some examples, the chamfer of the first end 141 may also have a guiding function to facilitate the electrical connection between the first pole post 130 and the second pole post 140.

In some realizable manners, referring to fig. 4, between the connected first and second pole posts 130, 140, the first pole post 130 has a second end 131 facing the second pole post 140. The second end 131 is provided with a chamfer.

In some examples, an end of the first pole column 130 facing away from the self cell 120 is a second end 131. The chamfer of the second end 131 of the first pole 130 and the chamfer of the first end 141 of the second pole 140 may together form the receiving groove 10b.

It is understood that a chamfered portion of the first end 141 of the second pole 140 may be located within the first recess 130 and another portion may be located outside of the first recess 130. The chamfer of the first end portion 141 located at the outside of the first recess 130 may form a receiving groove 10b with the second chamfer.

Taking the example that the first pole post 130 and the second pole post 140 electrically connected to each other are connected by welding, the first pole post 130 and the second pole post 140 can be fused to each other after being melted. The receiving groove 10b may store a liquid formed by melting the first and second poles 130 and 140. After the liquid is cooled, the first pole post 130 and the second pole post 140 can be fixedly connected, so that the connection reliability between the first pole post 130 and the second pole post 140 can be improved. In addition, the housing groove 10b may also reduce the possibility that the liquid overflows and then cools to form a solid body, occupying the outer space of the battery pack, thereby affecting the energy density of the entire battery module 10.

In some realizable ways, referring to fig. 5, the first pole 130 of the present embodiments is provided with a second recess 130b. Along the first direction X, the orthographic projection of the second recess 130b is located inside the orthographic projection of the second pole 140. Between the connected first pole post 130 and the second pole post 140, an insulation gap 10a is formed between the surface of the second pole post 140 facing the first pole post 130 and the bottom wall of the second recess 130b.

The second concave portion 130b may be recessed toward the electric core 120 along a surface of the first pole 130 facing away from the electric core 120, so as to form a thermal insulation gap 10a between the first pole 130 and the second pole 140, so that heat of one unit battery 100 may be diffused and cooled through the thermal insulation gap 10a, which is beneficial to slow down heat transfer.

In some examples, between the first pole post 130 and the second pole post 140 electrically connected to each other, along the first direction X, an orthogonal projection of the second recess 130b may be located inside an orthogonal projection of the second pole post 140. The surface of the second pole 140 facing the first pole 130 may form an insulating gap 10a with the bottom wall of the second recess 130b.

In some realizable manners, referring to fig. 4, along the first direction X, the orthographic projection of the outer contour of the first pole 130 may be disposed close to the orthographic projection of the outer contour of the housing 110. The orthographic projection of the outer contour of the second pole 140 may be disposed close to the orthographic projection of the outer contour of the housing 110.

In some examples, the size of the first pole post 130 and the size of the second pole post 140 may be set to be large enough so that a contact area for effective electrical connection between the first pole post 130 and the second pole post 140 may be satisfied while a sufficient thermal insulation space may be formed through the thermal insulation gap 10a for alleviating thermal spread between the unit batteries 100.

In some realizable manners, as shown in fig. 6 and 7, the battery module 10 of the embodiment of the present application may include a heat insulator 200. The heat insulating member 200 may be located inside the heat insulating gap 10a.

The heat insulating member 200 according to the embodiment of the present application may block heat of the unit battery 100 from being transferred to the adjacent unit battery 100.

In some examples, insulation 200 may have a low thermal conductivity and be resistant to high temperatures. It is understood that the melting point of the thermal shield 200 can be greater than the melting point of any of the first post 130, the second post 140, or the housing 110. When the temperature of the single battery 100 is increased to the melting point of the first pole post 130 and the second pole post 140, a phenomenon that the first pole post 130 and the second pole post 140 are fused into a whole exists between two adjacent single batteries 100. At this time, the thermal insulation member 200 may obstruct the fusion area between the first pole post 130 and the second pole post 140, and at the same time, the thermal runaway may be more effectively mitigated based on the low thermal conductivity of the thermal insulation member 200 itself.

In some examples, the material of the thermal shield 200 can be a ceramic silicone rubber. Under normal circumstances, the ceramic silicone rubber can have the general properties of common silicone rubber materials. Under the environment with higher temperature, the ceramic silicon rubber can quickly form a hard ceramic shell, so that the ceramic fire-resistant silicon rubber has better fire resistance, heat insulation and thermal shock resistance.

In some examples, the interior of the thermal shield 200 may form a porous structure at higher temperatures. Illustratively, the interior of the thermal shield 200 may form a plurality of bubble chambers for storing air when heated. Hot air generated from the unit cells 100 may enter the bubble chamber. The bubble chamber may trap hot air, so that the fluidity of the hot air may be reduced, which is advantageous to slow down the thermal spread between the unit batteries 100.

In some realizable manners, the cross-sectional shape of insulation 200 may match the cross-sectional shape of insulation gap 10a, as shown in fig. 6 and 7.

The heat insulating member 200 according to the embodiment of the present application may be filled in the heat insulating gap 10a. The thermal shield 200 may be in sufficient contact with the first pole post 130 and the second pole post 140.

The present application also provides a vehicle that may include the battery module 10 that may be provided with the above-described embodiments. The battery module 10 may provide power to the vehicle.

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

In some examples, the unit cell 100 may further include a vent channel plate and an explosion-proof valve. The vent passage plate may be located inside the housing 110. The explosion proof valve may be located outside the housing 110. The discharge channel plate and the explosion-proof valve can be correspondingly arranged. The discharge channel plate may be configured to support the battery cell, so that a gap may be formed between the battery cell and the inner wall of the casing 110, and when the single battery 100 is abnormal, the battery cell is not easy to block the explosion-proof valve, so as to cause the explosion-proof valve to fail.

In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

Reference throughout this specification to apparatus or components, in embodiments or applications, means or components must be constructed and operated in a particular orientation and therefore should not be construed as limiting the present embodiments. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise 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 means two or more. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for convenience of description and distinction and are not intended to limit the scope of the embodiments of the present application.

It should be understood that, in the embodiment of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

Claims (10)

1. A battery module, comprising:

the battery cell comprises a shell, a battery cell, a first pole column and a second pole column, wherein the battery cell is positioned inside the shell, the shell comprises a first opening and a second opening which are oppositely arranged along a first direction, the first pole column and the second pole column respectively seal the first opening and the second opening, the battery cell comprises a first pole lug and a second pole lug, the first pole lug is electrically connected with the first pole column, and the second pole lug is electrically connected with the second pole column;

the single batteries are sequentially connected along the first direction, and a heat insulation gap is formed between two opposite surfaces of the first pole column of one single battery and the second pole column of the other single battery.

2. The battery module according to claim 1, wherein the first electrode post is provided with a first concave portion, in two adjacent single batteries, a part of the second electrode post of one single battery is located in the first concave portion of the first electrode post of the other single battery, and the thermal insulation gap is formed between the surface of the second electrode post of one single battery facing the other single battery and the bottom wall of the first concave portion of the first electrode post of the other single battery.

3. The battery module according to claim 2, wherein a cross-sectional shape of a portion of the second pole post located in the first recess matches a cross-sectional shape of the first recess, the cross-section being perpendicular to the first direction.

4. The battery module according to claim 3, wherein between the first pole post and the second pole post connected, the second pole post has a first end portion facing the first pole post, the first end portion is provided with a chamfer, and a cross-sectional area of the first recess of the first pole post is gradually reduced, the cross-section being perpendicular to the first direction.

5. The battery module according to claim 4, wherein between the first pole post and the second pole post that are connected, the first pole post has a second end portion that faces the second pole post, and the second end portion is provided with a chamfer.

6. The battery module according to claim 1, wherein the first terminal post is provided with a second concave portion, an orthogonal projection of the second concave portion is located inside an orthogonal projection of the second terminal post along the first direction, the first terminal post and the second terminal post are connected with each other, and the thermal insulation gap is formed between the surface of the second terminal post facing the first terminal post and the bottom wall of the second concave portion.

7. The battery module according to claim 6, wherein, along the first direction, an orthographic projection of the outer contour of the first pole is arranged close to an orthographic projection of the outer contour of the housing, and/or;

and the orthographic projection of the outer contour of the second pole is close to the orthographic projection of the outer contour of the shell.

8. The battery module according to claim 1, comprising a heat insulator located inside the heat insulating gap.

9. The battery module according to claim 8, wherein a cross-sectional shape of the heat insulating member matches a cross-sectional shape of the heat insulating gap.

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

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