CN111435718A

CN111435718A - Battery system and electric vehicle having the same

Info

Publication number: CN111435718A
Application number: CN201910027681.3A
Authority: CN
Inventors: 乐继明; 王军; 谭军; 张舒; 陈虎; J.W.江
Original assignee: Farasis Energy Ganzhou Co Ltd
Current assignee: Farasis Energy Ganzhou Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2020-07-21

Abstract

The invention discloses a battery system and an electric vehicle having the same. The battery system comprises an installation shell, a battery module, a heat exchange device and an elastic piece. The mounting shell is internally provided with a mounting cavity; the elastic piece is arranged between the heat exchange device and the first wall surface of the mounting cavity and/or between the battery module and the second wall surface of the mounting cavity and is in contact with the battery module and the second wall surface of the mounting cavity, and the elastic piece is in a compressed state. The battery module of the battery module comprises a plurality of batteries, each battery comprises a body and positive and negative lugs, and the center lines of the positive and negative lugs are positioned between the first end surface of the body and the length center line; the positive electrode bus bar is positioned between the central line of the positive electrode lug and the second end face; and the negative electrode bus bar body of the negative electrode bus bar is positioned between the central line of the negative electrode lug and the second end surface. The battery system provided by the embodiment of the invention has the advantages of high energy density, large electric quantity, high heat transfer efficiency, stable performance, long service life, high safety and the like.

Description

Battery system and electric vehicle having the same

Technical Field

The present invention relates to the field of batteries, and in particular, to a battery system, and also to an electric vehicle having the battery system.

Background

The battery is a power source of the electric vehicle and is a core component of the electric vehicle. Temperature directly affects the performance of the battery and requires strict control over the operating temperature of the battery. The abnormality in temperature may have a great influence on the performance and life of the battery of the electric vehicle, and may even cause a safety problem such as thermal runaway.

Disclosure of Invention

An object of the present invention is to overcome the problems of the prior art and to provide a battery system and an electric vehicle having the same.

In order to achieve the above object, a first aspect of the present invention provides a battery system including: the mounting structure comprises a mounting shell, a first connecting piece and a second connecting piece, wherein a mounting cavity is formed in the mounting shell, and the mounting cavity is provided with a first wall surface and a second wall surface which are opposite in a first direction; the battery module, the battery module is established the installation intracavity, the battery module includes a plurality of battery modules, every the battery module includes: a plurality of cells, each of the cells including a body having first and second ends opposite in a length direction thereof and first and second end faces opposite in a width direction thereof, a positive tab disposed at the first end and a negative tab disposed at the second end, a center line of each of the positive and negative tabs being located between the first end face and a length center line of the body in the width direction thereof, the center line of each of the positive and negative tabs extending in the length direction of the body; a positive electrode bus bar including a positive electrode bar body and a plurality of positive electrode connecting portions, the positive electrode bar body being located between the center line of the positive electrode tab and the second end surface in the width direction of the body, the plurality of positive electrode connecting portions being provided on the positive electrode bar body at intervals in the thickness direction of the body, wherein the positive electrode tabs of the plurality of cells are connected to the plurality of positive electrode connecting portions; and a negative electrode bus bar, wherein the negative electrode bus bar comprises a negative electrode bar body and a plurality of negative electrode connecting parts, the negative electrode bar body is positioned between the central line of the negative electrode lug and the second end surface in the width direction of the body, the negative electrode connecting parts are arranged on the negative electrode bar body at intervals along the thickness direction of the body, the negative electrode lugs of the batteries are connected with the negative electrode connecting parts, the battery modules are connected in series, and the positive electrode bus bar of one of two adjacent battery modules is connected with the negative electrode bus bar of the other of the two adjacent battery modules; the heat exchange device is arranged in the installation cavity, is positioned between the battery module and the first wall surface of the installation cavity in the first direction, and is in contact with the battery module; and the elastic piece is arranged between the heat exchange device and the first wall surface of the mounting cavity in the first direction and/or between the battery module and the second wall surface of the mounting cavity in the first direction, and is in contact with each of the heat exchange device and the first wall surface of the mounting cavity and/or is in contact with each of the battery module and the second wall surface of the mounting cavity, wherein the elastic piece is in a compressed state.

The battery system has the advantages of high energy density, large electric quantity, high heat transfer efficiency, stable performance, long service life and high safety.

Preferably, the elastic member is an elastic plate or an elastic layer.

Preferably, the number of the battery modules is plural, the number of the elastic members is plural, and the plural elastic members are disposed at intervals, wherein each of the battery modules is opposite to at least two of the elastic members in the first direction.

Preferably, the compression of the elastic member is 20% -60% and/or the compression stress of the elastic member is 30-90 kpa.

Preferably, the battery system further includes a first flexible material layer, the first flexible material layer is disposed between the heat exchanging device and the first wall surface of the installation cavity in the first direction, the first flexible material layer is in contact with the first wall surface of the installation cavity, the first flexible material layer is in contact with one of the heat exchanging device and the elastic member, and the first flexible material layer is a heat insulating layer.

Preferably, the battery system further includes a second flexible material layer provided between the battery module and the heat exchanging device in the first direction, the second flexible material layer being in contact with each of the battery module and the heat exchanging device, wherein the second flexible material layer is a heat conductive layer.

Preferably, the center line of the positive tab and the length center line of the body are separated by a first distance in the width direction of the body, the center line of the negative tab and the length center line of the body are separated by a second distance in the width direction of the body, a ratio of the first distance to the width of the body is greater than zero and less than or equal to 0.3, and a ratio of the second distance to the width of the body is greater than zero and less than or equal to 0.3.

Preferably, a first end of each positive electrode connecting part is connected with the positive electrode row body, a positive electrode tab penetrating groove is defined between every two adjacent positive electrode connecting parts, and the end part, far away from the positive electrode row body, of each positive electrode tab penetrating groove is open; the first end of each negative electrode connecting part is connected with the negative electrode row body, a negative electrode tab penetrating groove is defined between every two adjacent negative electrode connecting parts, and the end part, far away from the negative electrode row body, of each negative electrode tab penetrating groove is open.

Preferably, one positive electrode connecting part is arranged between two adjacent positive electrode lugs, each positive electrode lug is provided with a positive electrode bending part, and the positive electrode bending part of each of the two adjacent positive electrode lugs is connected with the positive electrode connecting part; the negative electrode connecting part is arranged between every two adjacent negative electrode lugs, each negative electrode lug is provided with a negative electrode bending part, and the negative electrode bending part of each of the two adjacent negative electrode lugs is connected with the negative electrode connecting part.

A second aspect of the invention provides an electric vehicle including: a vehicle body; and a battery system according to the first aspect of the invention, the battery system being provided on the vehicle body.

The electric vehicle provided by the invention has the advantages of long endurance, less charging frequency, stable performance and high safety by arranging the battery system.

Drawings

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

fig. 2 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a battery of the battery module according to the embodiment of the present invention;

fig. 4 is a partial structural view of a battery of the battery module according to the embodiment of the present invention;

fig. 5 is a schematic structural view of a positive electrode bus bar and a negative electrode bus bar of a battery module according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a positive electrode bus bar and a negative electrode bus bar of a battery module according to an embodiment of the present invention;

fig. 7 is a partial exploded view of a battery module according to an embodiment of the present invention;

fig. 8 is an exploded view of a housing of a battery module according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a first end cap (second end cap) of a battery module according to an embodiment of the present invention;

fig. 10 is a partial sectional view of a housing of a battery module according to an embodiment of the present invention;

fig. 11 is a partial structural view of a battery module according to an embodiment of the present invention;

fig. 12 is a partial structural view of a battery module according to an embodiment of the present invention;

fig. 13 is a partial structural view of a battery module according to an embodiment of the present invention;

fig. 14 is a partial structural view of a battery module according to an embodiment of the present invention;

fig. 15 is a partial sectional view of a battery module according to an embodiment of the present invention;

fig. 16 is a partial structural schematic view of a battery system according to an embodiment of the present invention;

fig. 17 is a partial exploded view of a battery system according to an embodiment of the present invention;

fig. 18 is a partial exploded view of a battery system according to an embodiment of the present invention;

fig. 19 is a partial structural schematic view of an electric vehicle according to an embodiment of the invention;

fig. 20 is a partial exploded view of an electric vehicle according to an embodiment of the present invention;

fig. 21 is a partial structural schematic view of an electric vehicle according to an embodiment of the invention;

fig. 22 is a partial sectional view of a signal transmission member of a battery module according to an embodiment of the present invention;

fig. 23 is a partial sectional view of a signal transmission member of a battery module according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A battery system 100 according to an embodiment of the present invention is described below with reference to the drawings. As shown in fig. 3 to 6, 14, and 16 to 18, a battery system 100 according to an embodiment of the present invention includes a mounting case 2, a battery module 1, a heat exchanging device 3, and an elastic member 4.

Have installation cavity 23 in the installation shell 2, installation cavity 23 has relative first wall 231 and the second wall 232 in the first direction, and battery module 1 establishes in installation cavity 23, and heat transfer device 3 establishes in installation cavity 23. The heat exchanging device 3 is located between the battery module 1 and the first wall surface 231 of the mounting cavity 23 in the first direction, and the battery module 1 is in contact with the heat exchanging device 3.

The elastic member 4 is provided between the heat exchanging device 3 and the first wall 231 of the mounting cavity 23 in the first direction and/or between the battery module 1 and the second wall 232 of the mounting cavity 23 in the first direction. The elastic member 4 is in contact with each of the heat exchanging device 3 and the first wall 231 of the mounting cavity 23 and/or the elastic member 4 is in contact with each of the battery module 1 and the second wall 232 of the mounting cavity 23. The resilient member 4 is in a compressed state.

The battery module 1 includes a plurality of battery modules 10 a. As shown in fig. 3 to 6 and 14, each battery module 10a includes a plurality of batteries 11, a positive electrode bus bar 12, and a negative electrode bus bar 13.

Each battery 11 includes a body 111, a positive tab 112, and a negative tab 113. The body 111 has first and second ends opposite to each other in a length direction thereof, and first and second ends opposite to each other in a width direction thereof, the positive tab 112 is provided at the first end of the body 111, and the negative tab 113 is provided at the second end of the body 111. Wherein, a center line of each of the positive tab 112 and the negative tab 113 is located between the first end surface of the body 111 and a length center line of the body 111 in the width direction of the body 111, and the center line of each of the positive tab 112 and the negative tab 113 extends along the length direction of the body 111.

The positive electrode bus bar 12 includes a positive electrode row body 121 and a plurality of positive electrode connection portions 122, the positive electrode row body 121 being located between the center line of the positive electrode tab 112 and the second end face of the body 111 in the width direction of the body 111, the plurality of positive electrode connection portions 122 being provided on the positive electrode row body 121 at intervals in the thickness direction of the body 111. The positive electrode tabs 112 of the plurality of batteries 11 are connected to the plurality of positive electrode connecting portions 122.

The negative electrode bus bar 13 includes a negative electrode bar body 131 and a plurality of negative electrode connection portions 132, the negative electrode bar body 131 being located between the center line of the negative electrode tab 113 and the second end face of the body 111 in the width direction of the body 111, the plurality of negative electrode connection portions 132 being provided on the negative electrode bar body 131 at intervals in the thickness direction of the body 111. Negative electrode tabs 113 of the plurality of batteries 11 are connected to the plurality of negative electrode connecting portions 132. In which a plurality of battery modules 10a are connected in series, and a positive electrode bus bar 12 of one of the adjacent two battery modules 10a is connected to a negative electrode bus bar 13 of the other of the adjacent two battery modules 10 a.

The center line of the positive electrode tab and the center line of the negative electrode tab of the conventional battery are overlapped with the length center line of the battery body. Therefore, the space on both sides of the positive and negative electrode tabs of the conventional battery is small, resulting in a small space for accommodating the positive and negative electrode bus bars, i.e., the size of the positive and negative electrode bus bars is small, resulting in a low energy density of the conventional battery.

The battery module 10a can increase the distance between the positive tab 112 and the second end face of the body 111 and the distance between the negative tab 113 and the second end face of the body 111 by locating the center line of the positive tab 112 and the center line of the negative tab 113 between the first end face of the body 111 and the length center line of the body 111 in the width direction of the body 111. In other words, the distance between the positive tab 112 and the second end face of the body 111 may be greater than the distance between the positive tab and the end face (corresponding to the second end face) of the conventional battery, and the distance between the negative tab 113 and the second end face of the body 111 may be greater than the distance between the negative tab and the end face (corresponding to the second end face) of the conventional battery.

The battery module 10a thus has a larger space for accommodating the positive electrode bank 121 and a larger space for accommodating the negative electrode bank 131, so that the size of the positive electrode bank 121 and the size of the negative electrode bank 131 can be increased. That is, the size of the cathode array 121 may be larger than that of the existing battery, and the size of the anode array 131 may be larger than that of the existing battery. This can increase the overcurrent capacity of the positive electrode bus bar 12 (positive electrode bar body 121) and the overcurrent capacity of the negative electrode bus bar 13 (negative electrode bar body 131), and thus can increase the energy density of the battery module 10 a.

Since the battery module 10a has advantages such as high energy density, the battery module 1 and the battery system 100 also have advantages such as high energy density.

According to the battery system 100 of the embodiment of the invention, the elastic member 4 in a compressed state is arranged between the heat exchanging device 3 and the first wall surface 231 of the installation cavity 23 and/or the elastic member 4 in a compressed state is arranged between the battery module 1 and the second wall surface 232 of the installation cavity 23, so that the elastic member 4 can apply an elastic force to the heat exchanging device 3 and/or an elastic force to the battery module 1 and/or the heat exchanging device 3.

Therefore, the heat exchange device 3 can be tightly and effectively contacted with the battery module 1, heat can be effectively transferred between the battery module 1 and the heat exchange device 3, namely, the battery module 1 can be effectively cooled or heated by the heat exchange device 3, so that the temperature of the battery module 1 is always in the working temperature range, and the battery module 1 and the battery system 100 are ensured to be in good working states.

Therefore, the battery system 100 according to the embodiment of the invention has the advantages of high energy density, large electric quantity, high heat transfer efficiency, stable performance, long service life, high safety and the like.

As shown in fig. 1 to 23, in some embodiments of the present invention, the battery module 1 may include a module battery assembly 10, a plurality of graphite heat-conductive members 151, a graphite soaking plate 152, a first insulating protective plate 161, a second insulating protective plate 162, a third insulating protective plate 163, a fourth insulating protective plate 164, and a case 17.

The housing 17 may include a case 171, the case 171 may have an accommodation cavity 177 therein, and the module battery assembly 10, the plurality of graphite heat-conducting members 151, the graphite soaking plate 152, the first insulating protection plate 161, the second insulating protection plate 162, the third insulating protection plate 163, and the fourth insulating protection plate 164 may be disposed in the accommodation cavity 177.

As shown in fig. 3 and 4, the battery module 10a may include a plurality of cells 11, a positive electrode bus bar 12, and a negative electrode bus bar 13, each cell 11 may include a body 111, a positive electrode tab 112, and a negative electrode tab 113, the body 111 may have first and second ends opposite in a length direction thereof, and the body 111 may have first and second ends opposite in a width direction thereof, wherein the length direction of the body 111 is as indicated by an arrow a in fig. 4, and the width direction of the body 111 is as indicated by an arrow B in fig. 4, it may be understood by those skilled in the art that the positive electrode tab 112 of the cell 11 may be disposed on the first end of the body 111, a center line L1 of the positive electrode tab 112 may be disposed between the first end of the body 111 and a length center line L2 of the body 111 in the width direction of the body 111, the center line of the positive electrode tab 112 may extend in the length direction of the body 111, the negative electrode tab 113 of the cell 11 may be disposed on the second end of the body 111, the center line of the negative electrode tab 113 may be disposed between the first end of the body 111 and the center line 113 of the body 111 in the width direction of the length of the body 111.

That is, the center line of positive tab 112 and the center line of negative tab 113 may both be offset from the length center line of body 111 to the same side in the width direction of body 111. The length center line of the body 111 is a center line of the body 111 extending along the length direction thereof.

As shown in fig. 5, 6 and 14, the positive electrode bus bar 12 may include a positive electrode bar body 121 and a plurality of positive electrode connection parts 122, and the positive electrode bar body 121 may be located between the center line of the positive electrode tab 112 and the second end face of the body 111 in the width direction of the body 111. A plurality of positive electrode connecting portions 122 may be provided on the positive electrode row body 121 at intervals in the thickness direction of the body 111.

The negative electrode bus bar 13 may include a negative electrode bar body 131 and a plurality of negative electrode connection parts 132, and the negative electrode bar body 131 may be located between the center line of the negative electrode tab 113 and the second end surface of the body 111 in the width direction of the body 111. A plurality of negative electrode connecting portions 132 may be provided on the negative electrode bank 131 at intervals in the thickness direction of the body 111.

For example, when the width direction of the body 111 coincides with (is the same as) the up-down direction, the positive electrode bank 121 may be located between the center line of the positive electrode tab 112 and the second end face of the body 111 in the up-down direction, and the negative electrode bank 131 may be located between the center line of the negative electrode tab 113 and the second end face of the body 111 in the up-down direction. For further example, the positive electrode bank 121 may be located above the center line of the positive electrode tab 112, the positive electrode bank 121 may be located below the second end face of the body 111, the negative electrode bank 131 may be located above the center line of the negative electrode tab 113, and the negative electrode bank 131 may be located below the second end face of the body 111.

Wherein the positive electrode tabs 112 of the plurality of batteries 11 may be connected to the plurality of positive electrode connection parts 122, and the negative electrode tabs 113 of the plurality of batteries 11 may be connected to the plurality of negative electrode connection parts 132, so as to connect the plurality of batteries 11 in parallel.

By locating the center line of the positive tab 112 and the center line of the negative tab 113 between the first end face of the body 111 and the length center line of the body 111 in the width direction of the body 111, the distance between the positive tab 112 and the second end face of the body 111 and the distance between the negative tab 113 and the second end face of the body 111 can be increased. In other words, the distance between the positive tab 112 and the second end face of the body 111 may be greater than the distance between the positive tab and the end face (corresponding to the second end face) of the conventional battery, and the distance between the negative tab 113 and the second end face of the body 111 may be greater than the distance between the negative tab and the end face (corresponding to the second end face) of the conventional battery.

The battery module 10a thus has a larger space for accommodating the positive electrode bank 121 and a larger space for accommodating the negative electrode bank 131, so that the size of the positive electrode bank 121 and the size of the negative electrode bank 131 can be increased. That is, the size of the cathode array 121 may be larger than that of the existing battery, and the size of the anode array 131 may be larger than that of the existing battery. This can increase the overcurrent capacity of the positive electrode bus bar 12 (positive electrode bar body 121) and the overcurrent capacity of the negative electrode bus bar 13 (negative electrode bar body 131), and thus can increase the energy density of the battery module 10a, and further can increase the energy density of the module battery assembly 10 and the battery module 1.

Therefore, the module battery assembly 10 and the battery module 1 according to the embodiment of the present invention have advantages of high energy density, etc.

Specifically, the width of the cathode bank 121 (the dimension of the cathode bank 121 in the width direction of the body 111) may be greater than that of the cathode bank of the existing battery, and the width of the anode bank 131 (the dimension of the anode bank 131 in the width direction of the body 111) may be greater than that of the anode bank of the existing battery.

Preferably, the center line of positive electrode tab 112 is spaced from the length center line of body 111 by a first distance S1 in the width direction of body 111, and the center line of negative electrode tab 113 is spaced from the length center line of body 111 by a second distance in the width direction of body 111. Wherein, the ratio of the first distance S1 to the width of the body 111 is greater than zero and less than or equal to 0.3, and the ratio of the second distance to the width of the body 111 is greater than zero and less than or equal to 0.3. More preferably, a ratio of the first distance S1 to the width of the body 111 may be equal to or greater than 0.1 and equal to or less than 0.3, and a ratio of the second distance to the width of the body 111 may be equal to or greater than 0.1 and equal to or less than 0.3.

Wherein the greater the ratio of the first distance S1 to the width of the body 111 and the greater the ratio of the second distance to the width of the body 111, the greater the energy density of the battery module 10a, the module battery assembly 10, and the battery module 1. In other words, the greater the first distance S1 and the greater the second distance, the greater the energy density of the battery module 10a, the module battery assembly 10, and the battery module 1. First distance S1 may be equal to the second distance, i.e., the centerline of positive tab 112 and the centerline of negative tab 113 may coincide.

The modular battery assembly 10 may include a first PCB board 14, a second PCB board (not shown in the drawings), and a plurality of battery modules 10a, and the modular battery assembly 10 may be disposed in the receiving cavity 177 of the housing 17 of the battery module 1.

Preferably, a plurality of battery modules 10a may be connected in series. The positive electrode bus bar 12 of one of the adjacent two battery modules 10a and the negative electrode bus bar 13 of the other of the adjacent two battery modules 10a may be connected so as to connect the adjacent two battery modules 10a in series, as shown in fig. 14.

The positive electrode bus bar 12 and the negative electrode bus bar 13 that are connected (e.g., electrically connected) may constitute a series bar 12a, i.e., the series bar 12a may be connected (e.g., electrically connected) to the positive electrode tab 112 of each battery 11 of one of the two adjacent battery modules 10a and the negative electrode tab 113 of each battery 11 of the other of the two adjacent battery modules 10 a. Preferably, the battery module 1 may include a plurality of the series rows 12a, i.e., the battery module 1 may include at least three battery modules 10 a.

The first PCB 14 may be connected to a portion of the plurality of series rows 12a and the second PCB may be connected to the remaining portion of the plurality of series rows 12 a. In other words, the first PCB board 14 may be positioned at one side (in the length direction of the body 111) of the plurality of battery modules 10a (as shown in fig. 2), and the second PCB board may be positioned at the other side (in the length direction of the body 111) of the plurality of battery modules 10 a.

The positive electrode bus bar 12 may be made of a first conductive material (e.g., aluminum), and the negative electrode bus bar 13 may include a first base, which may be made of the first conductive material, and a first connection layer, which may be made of a second conductive material (e.g., copper) different from the first conductive material, provided on the first base.

Negative tab 113 may be made of the second conductive material and positive tab 112 may be made of the first conductive material. Wherein the negative tab 113 may be welded to the first connection layer and the positive tab 112 may be welded to the positive bus bar 12. Since both the positive electrode tab 112 and the positive electrode bus bar 12 are made of the first conductive material and both the negative electrode tab 113 and the first connection layer are made of the second conductive material, the occurrence of electrochemical corrosion can be prevented.

Preferably, the first base of one of the adjacent two battery modules 10a and the positive electrode bus bar 12 of the other of the adjacent two battery modules 10a may be integrally molded. The structure of the battery assembly 10 and the battery module 1 can thereby be made more rational.

In one embodiment of the present invention, the cathode bank 121 may include a first portion and a second portion, and the first portion and the second portion may be opposite and spaced apart in a width direction of the body 111. A first end of each positive electrode connection portion 122 may be connected to the first portion, a second end of each positive electrode connection portion 122 may be connected to the second portion, and a positive electrode tab slot may be defined between two adjacent positive electrode connection portions 122. The negative electrode bank 131 may include a third portion and a fourth portion, the third portion being opposite to and spaced apart from the fourth portion in the width direction of the body 111. A first end of each negative electrode connection part 132 may be connected to the third portion, a second end of each negative electrode connection part 132 may be connected to the fourth portion, and a negative electrode tab through groove may be defined between adjacent two negative electrode connection parts 132.

When the positive electrode bus bar 12 and the negative electrode bus bar 13 are assembled with the plurality of cells 11, both the positive electrode bus bar 12 and the negative electrode bus bar 13 can move relative to the plurality of cells 11 in the length direction of the body 111. For example, both the positive electrode bus bar 12 and the negative electrode bus bar 13 can be moved in the horizontal direction with respect to the plurality of cells 11. Wherein, a positive tab 112 may pass through the positive tab through slot of the positive bus bar 12, and a negative tab 113 may pass through the negative tab through slot of the negative bus bar 13.

By making the positive electrode bank 121 include the first portion and the second portion and making the negative electrode bank 131 include the third portion and the fourth portion, the space of the battery module 10a for accommodating the positive electrode bank 121 and the space for accommodating the negative electrode bank 131 are more fully utilized. This can further improve the overcurrent capacity of the positive electrode bus bar 12 (positive electrode bar body 121) and the overcurrent capacity of the negative electrode bus bar 13 (negative electrode bar body 131), and can further improve the energy densities of the battery module 10a, the module battery assembly 10, and the battery module 1.

In another embodiment of the present invention, as shown in fig. 5, 6 and 14, a first end of each positive electrode connecting portion 122 may be connected to the positive electrode row body 121, a positive electrode tab penetrating groove 123 may be defined between two adjacent positive electrode connecting portions 122, and an end of each positive electrode tab penetrating groove 123 far from the positive electrode row body 121 may be open. A first end of each negative electrode connection part 132 may be connected to the negative electrode bank body 131, a negative electrode tab penetrating groove 133 may be defined between adjacent two negative electrode connection parts 132, and an end of each negative electrode tab penetrating groove 133, which is away from the negative electrode bank body 131, may be open. In other words, both the positive electrode bus bar 12 and the negative electrode bus bar 13 may be substantially comb-shaped.

When the positive electrode bus bar 12 and the negative electrode bus bar 13 are assembled with the plurality of cells 11, both the positive electrode bus bar 12 and the negative electrode bus bar 13 can be moved in the width direction of the body 111 relative to the plurality of cells 11. For example, both the positive electrode bus bar 12 and the negative electrode bus bar 13 can move in the up-down direction with respect to the plurality of cells 11. There may be positive tab 112 passing through positive tab through slot 123 of positive bus bar 12 and negative tab 113 passing through negative tab through slot 133 of negative bus bar 13.

Since both the positive tab 112 and the negative tab 113 have a certain flexibility, the positive bus bar 12 and the negative bus bar 13 are moved relative to the plurality of cells 11 in the width direction of the body 111, so that the positive bus bar 12, the negative bus bar 13, and the plurality of cells 11 can be assembled together more easily and more quickly, and thus the difficulty of assembling the battery module 10a can be reduced, and the assembly efficiency of the battery module 10a can be improved.

Specifically, both the positive and

negative electrode tabs

112 and 113 may, and may not necessarily, bend or wrinkle during the stacking of the cells. The more distant the positive tab 112 and the negative tab 113 are from the body 111, the greater the degree of bending and wrinkling, and the root of the positive tab 112 (the portion of the positive tab 112 adjacent to the body 111) and the root of the negative tab 113 (the portion of the negative tab 113 adjacent to the body 111) are not bent or wrinkled.

If the end of positive tab penetrating groove 123 remote from positive bar body 121 is not open and the end of each negative tab penetrating groove 133 remote from negative bar body 131 is not open, positive bar 12 and negative bar 13 can only be moved relative to body 111 substantially along the length of body 111 when assembling positive bar 12, negative bar 13 and plurality of cells 11 together, i.e. positive bar 12 and negative bar 13 are moved in a direction adjacent to body 111. In other words, positive tab penetrating groove 123 first passes through the portion of positive tab 112 away from body 111, and negative tab penetrating groove 133 first passes through the portion of negative tab 113 away from body 111. In order to ensure a certain welding area of positive electrode bus bar 12 and negative electrode bus bar 13, the width of positive electrode tab penetrating groove 123 and the width of negative electrode tab penetrating groove 133 tend to be small. This results in the failure of bent and wrinkled positive tab 112 to pass through positive tab penetration groove 123 and the failure of bent and wrinkled negative tab 113 to pass through negative tab penetration groove 133.

By opening the end of positive tab penetrating groove 123 remote from positive row 121 and the end of each negative tab penetrating groove 133 remote from negative row 131, it is possible to insert positive tab penetrating groove 123 from the root of positive tab 112 for assembly and to insert negative tab penetrating groove 133 from the root of negative tab 113 for assembly. Therefore, the bending and the wrinkling of the positive electrode tab 112 and the negative electrode tab 113 can be prevented from adversely affecting the assembly of the positive electrode bus bar 12 and the negative electrode bus bar 13, so that the assembly difficulty of the battery module 10a can be reduced, and the assembly efficiency of the battery module 10a can be improved.

Preferably, there may be one positive electrode connection part 122 between two adjacent positive electrode tabs 112, and each of the two adjacent positive electrode tabs 112 may be connected to the one positive electrode connection part 122. One negative electrode tab 132 may be provided between two adjacent negative electrode tabs 113, and each of the two adjacent negative electrode tabs 113 may be connected to the one negative electrode tab 132.

More preferably, each positive tab 112 may have a positive electrode bent portion, the positive electrode bent portion of each of two adjacent positive tabs 112 may be connected to the one positive electrode connection portion 122, each negative electrode tab 113 may have a negative electrode bent portion, and the negative electrode bent portion of each of two adjacent negative tabs 113 may be connected to the one negative electrode connection portion 132.

It will be understood by those skilled in the art that an insulating support may be provided between the positive bus bar 12 and the bodies 111 of the plurality of cells 11, and an insulating support may be provided between the negative bus bar 13 and the bodies 111 of the plurality of cells 11. The insulating support may be known and is not relevant to the inventive point of the present application and is therefore not described in detail.

As shown in fig. 2, the battery module 1 may further include a first PCB 14 and a second PCB (not shown), the first PCB 14 may be connected to a portion of the plurality of serial rows 12a, and the second PCB may be connected to the remaining portion of the plurality of serial rows 12 a. Specifically, the portion of the plurality of series rows 12a may be located at a first side of the bodies 111 of the plurality of cells 11, and the remaining portion of the plurality of series rows 12a may be located at a second side of the bodies 111 of the plurality of cells 11, the first side of the body 111 being opposite to the second side of the body 111 in a length direction (e.g., a front-rear direction) of the body 111.

As shown in fig. 2, the battery module 1 may further include a signal transmission member 19. As shown in fig. 22 and 23, the signal transmitting member 19 may include a collecting portion 191, a receiving portion 192, a plurality of first contact portions 1913, a plurality of second contact portions 1923, and a transmitting portion 195. The collecting part 191 may be provided with one of a plurality of first pins 1911 and a plurality of first slots 1912, and the receiving part 192 may be provided with one of a plurality of second pins 1921 and a plurality of second slots 1922.

The plurality of first contact portions 1913 may be disposed in the plurality of first slots 1912 in a one-to-one correspondence, and the plurality of second contact portions 1923 may be disposed in the plurality of second slots 1922 in a one-to-one correspondence. In other words, the number of first contacts 1913 may be equal to the number of first slots 1912, the number of second contacts 1923 may be equal to the number of second slots 1922, one first contact 1913 is disposed in each first slot 1912, and one second contact 1923 is disposed in each second slot 1922.

The first end of the transmitting part 195 may be provided with the other one of the plurality of first pins 1911 and the plurality of first slots 1912, and the second end of the transmitting part 195 may be provided with the other one of the plurality of second pins 1921 and the plurality of second slots 1922. The plurality of first pins 1911 may be fitted in the plurality of first slots 1912 in a one-to-one correspondence, the plurality of first pins 1911 may be in contact with the plurality of first contact portions 1913 in a one-to-one correspondence, the plurality of second pins 1921 may be fitted in the plurality of second slots 1922 in a one-to-one correspondence, and the plurality of second pins 1921 may be in contact with the plurality of second contact portions 1923 in a one-to-one correspondence.

That is, the number of the first pins 1911 may be equal to the number of the first slots 1912, the number of the second pins 1921 may be equal to the number of the second slots 1922, the first pins 1911 fitted in the first slots 1912 may contact the first contact portions 1913 in the first slots 1912, and the second pins 1921 fitted in the second slots 1922 may contact the second contact portions 1923 in the second slots 1922.

A first protection layer 196 may be disposed in each first slot 1912, the first protection layer 196 may cover the contact position of the corresponding first plug 1911 and the first contact portion 1913, a second protection layer 197 may be disposed in each second slot 1922, and the second protection layer 197 may cover the contact position of the corresponding second plug 1921 and the second contact portion 1923.

The respective first pin 1911 and first contact 1913 refer to: a first plug 1911 and a first contact 1913, which are located in the same first slot 1912 as the first protective layer 196; the respective second insert pins 1921 and second contact portions 1923 refer to: and a second pin 1921 and a second contact 1923 of the second protective layer 197 in the same second slot 1922.

By providing the first protective layer 196 covering the contact portions of the respective first pins 1911 and first contact portions 1913 and the second protective layer 197 covering the contact portions of the respective second pins 1921 and second contact portions 1923, it is possible to block the insulating paste with the first protective layer 196 and the second protective layer 197 when the insulating paste is filled into the receiving cavity 177 of the battery module 1.

This prevents the insulating paste from pushing apart the first plug 1911 and the first contact portion 1913 and the second plug 1921 and the second contact portion 1923 that are connected together, i.e., prevents the insulating paste from flowing between the first plug 1911 and the first contact portion 1913 and between the second plug 1921 and the second contact portion 1923, and thus prevents the first plug 1911 and the first contact portion 1913 from being disconnected and the second plug 1921 and the second contact portion 1923 from being disconnected.

The first plug 1911 and the first contact 1913, and the second plug 1921 and the second contact 1923 can be stably connected, that is, effectively connected together, so that the voltage signal of each battery 11 in the battery module 1 can be stably and effectively collected.

As shown in fig. 22, a first protection layer 196 may be disposed at the opening of the corresponding first slot 1912, the first protection layer 196 may fill the gap between the wall of the corresponding first slot 1912 and the corresponding first pin 1911, a second protection layer 197 may be disposed at the opening of the corresponding second slot 1922, and the second protection layer 197 may fill the gap between the wall of the corresponding second slot 1922 and the corresponding second pin 1921.

Wherein, the corresponding first slot 1912 refers to the first slot 1912 filled with the first protection layer 196, the corresponding first pin 1911 refers to the first pin 1911 fitted in the first slot 1912 filled with the first protection layer 196, the corresponding second slot 1922 refers to the second slot 1922 filled with the second protection layer 197, and the corresponding second pin 1921 refers to the second pin 1921 fitted in the second slot 1922 filled with the second protection layer 197.

That is, the first protection layer 196 may be disposed on the first plug 1911, the first protection layer 196 may close the opening of the first slot 1912, and the first protection layer 196 may be spaced apart from the corresponding contact between the first plug 1911 and the first contact portion 1913. The second protection layer 197 may be disposed on the second pins 1921, the second protection layer 197 may block the openings of the second slots 1922, and the second protection layer 197 may be spaced apart from the contacts of the corresponding second pins 1921 and the second contacts 1923.

The first protective layer 196 may thereby block the entry of the insulating glue into the first slot 1912 and the second protective layer 197 may block the entry of the insulating glue into the second slot 1922, thereby preventing the insulating glue from washing apart the first pin 1911 and the first contact 1913 and the second pin 1921 and the second contact 1923 that are connected together, so as to ensure that the first pin 1911 and the first contact 1913 and the second pin 1921 and the second contact 1923 are stably and effectively connected together.

As shown in fig. 23, the first protective layer 196 may be in contact with the respective first pins 1911 and first contacts 1913, and the second protective layer 197 may be in contact with the respective second pins 1921 and second contacts 1923. The corresponding first contact 1913 refers to the first contact 1913 disposed in the same first slot 1912 as the first protection layer 196, and the corresponding second contact 1923 refers to the second contact 1923 disposed in the same second slot 1922 as the second protection layer 197.

The first protective layer 196 may thereby block the contact of the insulating glue with the corresponding first pins 1911 and first contacts 1913, and the second protective layer 197 may block the contact of the insulating glue with the corresponding second pins 1921 and second contacts 1923, thereby preventing the insulating glue from washing apart the first pins 1911 and first contacts 1913 and the second pins 1921 and second contacts 1923 that are connected together, so as to ensure that the first pins 1911 and first contacts 1913 and the second pins 1921 and second contacts 1923 are stably and effectively connected together.

Each first pin 1911 or first contact 1913 in each first slot 1912 of the signal transmission member 19 may be connected to the first PCB 141, and each second pin 1921 or second contact 1923 in each second slot 1922 of the signal transmission member 19 may be connected to the second PCB 142. The signal transmission member 19 may transmit the voltage signal collected by one of the first and second PCB boards 141 and 142 to the other of the first and second PCB boards 141 and 142. The signal transmission member 19 is used for acquiring a voltage signal and a temperature signal of the battery pack (including a plurality of batteries 11), and the acquisition points of the temperature signal can be on the first PCB 141 and the second PCB 142.

Preferably, the transmitting part 195 may have flexibility. Thereby, the transmission part 195 can be more conveniently and easily connected to the collection part 191 and the reception part 192.

The heat-conducting piece is arranged between two adjacent batteries of the existing battery module, so that the heat of the batteries is conducted to the bottom of the battery module through the heat-conducting piece, and finally the heat of the bottom of the battery module is led out through the liquid cooling device. However, the conventional battery module has a drawback of unstable performance.

After the intensive research of the inventor, the inventor finds that: although the heat generated by each battery is conducted out by the heat conducting member, the heat dissipation conditions of the batteries are different due to different positions of the batteries in the battery module, so that the temperature difference still exists among the batteries, namely, the temperature of some batteries is higher, the performance of the batteries is unstable due to the higher temperature, and the performance of the battery module is unstable.

As shown in fig. 11-13, in an embodiment of the present invention, each graphite heat-conducting member 151 may have a first heat-conducting flat plate portion 1511 and a second heat-conducting flat plate portion 1512, and the first heat-conducting flat plate portion 1511 may be perpendicular to the second heat-conducting flat plate portion 1512. Here, one first heat-conducting flat plate portion 1511 may be disposed between two adjacent batteries 11, and each first heat-conducting flat plate portion 1511 may contact each of two adjacent batteries 11.

The graphite soaking plate 152 may be parallel to the second thermally conductive flat plate portion 1512 of each of the plurality of graphite thermally conductive members 151, and the graphite soaking plate 152 may be in contact with the second thermally conductive flat plate portion 1512 of each of the plurality of graphite thermally conductive members 151. Here, the second heat-conductive flat plate portion 1512 of each of the plurality of graphite heat-conductive members 151 may be located between the graphite soaking plate 152 and each cell 11 in a direction perpendicular to the graphite soaking plate 152 (e.g., the first direction). Whereby the graphite soaking plate 152 can be in contact with each cell 11 through the plurality of graphite heat-conducting members 151.

According to the battery module 1 of the embodiment of the invention, the plurality of graphite heat-conducting members 151 in contact with the batteries 11 and the graphite soaking plate 152 in contact with the plurality of graphite heat-conducting members 151 are arranged, so that the plurality of batteries 11 can be in contact with the graphite soaking plate 152 through the plurality of graphite heat-conducting members 151, and therefore, the graphite soaking plate 152 can be used for transferring heat between the batteries 11 with temperature difference, so that the temperatures of the plurality of batteries 11 are equalized and the temperature difference between the plurality of batteries 11 is eliminated, even if the temperatures of the plurality of graphite heat-conducting members 151 are more uniform and even, the temperatures of the plurality of batteries 11 are more uniform and even, and the balance of the internal temperature field temperature of the battery module 1 is realized.

The plurality of cells 11 may be in contact with the second heat-conducting flat plate portions 1512 of the plurality of graphite heat-conducting members 151 in a one-to-one correspondence. The structure of the battery module 1 can thereby be made more rational. A double-sided adhesive tape may be filled between the adjacent battery 11 and the first heat-conducting flat plate portion 1511.

Preferably, the graphite soaking plate 152 has a thickness of 0.04 mm to 0.5 mm, and the second heat-conducting flat plate portion 1512 of each of the graphite heat-conducting members 151 has a thickness of 0.04 mm to 0.5 mm.

The housing 171 may be integrally formed, and preferably, the housing 171 may be an integrally stretch-formed aluminum case. The receiving cavity 177 may have a first wall (e.g., a top wall) and a second wall (e.g., a bottom wall) opposite in a first direction, which may be perpendicular to a second direction, and a third wall (e.g., a front wall) and a fourth wall (e.g., a rear wall) opposite in the second direction.

The receiving cavity 177 may have first and second ends opposite in a third direction, and both the first and second ends of the receiving cavity 177 may be open, and the third direction may be perpendicular to each of the first and second directions.

Specifically, the first direction, the width direction of the body 111, and the height direction of the case 171 may coincide with (be the same as) each other, the second direction, the length direction of the body 111, and the width direction of the case 171 may coincide with (be the same as) each other, and the third direction, the thickness direction of the body 111, and the length direction of the case 171 may coincide with (be the same as) each other. More specifically, the first direction may be an up-down direction, the second direction may be a front-rear direction, and the third direction may be a left-right direction. Here, the up-down direction is indicated by an arrow C in fig. 2, the front-back direction is indicated by an arrow D in fig. 2, and the left-right direction is indicated by an arrow E in fig. 2.

As shown in fig. 2 and 7, each of a first insulating protective plate 161 and a second insulating protective plate 162 may be provided on the module battery assembly 10, the first insulating protective plate 161 may be located between the first wall surface and the module battery assembly 10 in the first direction, and the second insulating protective plate 162 may be located between the second wall surface and the module battery assembly 10 in the first direction.

Each of the third and fourth insulating

protection plates

163 and 164 may be connected to the first insulating protection plate 161, the third insulating protection plate 163 may be located between the third wall and the module battery assembly 10 in the second direction, and the fourth insulating protection plate 164 may be located between the fourth wall and the module battery assembly 10 in the second direction.

Since the first end and the second end of the receiving cavity 177 are open, the modular battery assembly 10 can move in the third direction when the modular battery assembly 10 is loaded into the receiving cavity 177.

By providing the first insulating protection plate 161, the second insulating protection plate 162, the third insulating protection plate 163 and the fourth insulating protection plate 164 between the module battery pack 10 and the wall surface of the receiving cavity 177 (the first wall surface to the fourth wall surface), so that, during the process of mounting the modular battery assembly 10 in the receiving cavity 177, not only the modular battery assembly 10 can be protected by the first insulating protection plate 161, the second insulating protection plate 162, the third insulating protection plate 163 and the fourth insulating protection plate 164, so as to prevent the case 171 from damaging the edge seals of the modular battery assembly 10, and the module battery assembly 10 may be insulated from the case 171 by the first insulating protective plate 161, the second insulating protective plate 162, the third insulating protective plate 163 and the fourth insulating protective plate 164, so as to further improve the insulating property between the modular battery assembly 10 and the case 171, i.e., to further improve the insulating property of the battery module 1.

Preferably, the first insulating protection plate 161, the second insulating protection plate 162, the third insulating protection plate 163, and the fourth insulating protection plate 164 may be PC insulating protection plates (sheets, layers).

A first adhesive layer (e.g., a double-sided tape) may be disposed between the first insulating and protecting plate 161 and the module battery assembly 10, and a second adhesive layer (e.g., a double-sided tape) may be disposed between the second insulating and protecting plate 162 and the module battery assembly 10. In other words, the first insulating and protective plate 161 may be bonded to (the upper surface of) the module battery assembly 10 by the first adhesive layer, and the second insulating and protective plate 162 may be bonded to (the lower surface of) the module battery assembly 10 by the second adhesive layer.

As shown in fig. 2 and 7, the first insulating protection plate 161 may have a first edge and a second edge in the second direction, and an edge of the third insulating protection plate 163 may be connected to the first edge and an edge of the fourth insulating protection plate 164 may be connected to the second edge. Wherein each of the third and fourth insulating

protection plates

163 and 164 may extend from the first insulating protection plate 161 to a direction adjacent to the second insulating protection plate 162. The structure of the battery module 1 can thereby be made more rational.

Specifically, the upper edge of the third insulating and protecting plate 163 may be connected to the front edge of the first insulating and protecting plate 161, and the upper edge of the fourth insulating and protecting plate 164 may be connected to the rear edge of the first insulating and protecting plate 161.

Preferably, the first insulating protection plate 161, the third insulating protection plate 163, and the fourth insulating protection plate 164 may be integrally molded. The manufacturing difficulty and manufacturing cost of the battery module 1 can thereby be reduced.

As shown in fig. 15, in some embodiments of the present invention, the battery module 1 may further include an insulating glue layer 18, and the insulating glue layer 18 is filled in the receiving cavity 177.

Through filling insulating glue layer 18 in holding chamber 177 to not only can avoid each part of battery module 1 to produce under long-term vibrations not hard up, so that can greatly prolong battery module 1's life, can prevent moreover that water, dust etc. from entering into holding chamber 177 in, so that improve battery module 1's insulating properties and protection level.

The insulating glue layer 18 may be formed of an insulating glue, which may contain an isocyanate-based prepolymer, a chain extender, and carbonate in a weight ratio of 100: 20-120: 0.5-25, and the number average molecular weight of the isocyanate prepolymer is 2000-4500.

The insulating adhesive can also contain an isocyanate prepolymer, a chain extender and a polymeric alcohol, wherein the number average molecular weight of the isocyanate prepolymer is 1000-4500, and the number average molecular weight of the polymeric alcohol is 200-4000.

Preferably, an insulating glue layer 18 may be filled between two adjacent batteries 11, an insulating glue layer 18 may be filled between the first PCB 14 and the plurality of batteries 11, and an insulating glue layer 18 may be filled between the second PCB and the plurality of batteries 11. Therefore, each part of the battery module 1 can be further prevented from loosening under long-term vibration, and the insulating property and the protection grade of the battery module 1 can be further improved.

As shown in fig. 15, an insulating adhesive layer 18 may be filled between the first insulating protective plate 161 (insulating protective plate) and the first wall surface of the accommodating cavity 177, an insulating adhesive layer 18 may be filled between the second insulating protective plate 162 and the second wall surface of the accommodating cavity 177, an insulating adhesive layer 18 may be filled between the third insulating protective plate 163 (first insulating protective side plate) and the third wall surface of the accommodating cavity 177, and an insulating adhesive layer 18 may be filled between the fourth insulating protective plate 164 (second insulating protective side plate) and the fourth wall surface of the accommodating cavity 177. Therefore, each part of the battery module 1 can be further prevented from loosening under long-term vibration, and the insulating property and the protection grade of the battery module 1 can be further improved.

The first PCB 14 may be located between the third insulating protection plate 163 and the plurality of cells 11 in the second direction, and the second PCB may be located between the fourth insulating protection plate 164 and the plurality of cells 11 in the second direction, wherein an insulating glue layer 18 may be filled between the first PCB 14 and the third insulating protection plate 163, and an insulating glue layer 18 may be filled between the second PCB and the fourth insulating protection plate 164. Therefore, each part of the battery module 1 can be further prevented from loosening under long-term vibration, and the insulating property and the protection grade of the battery module 1 can be further improved.

Preferably, the insulating glue layer 18 may fill the receiving cavity 177. Not only can further avoid battery module 1's each part to produce under long-term vibrations not hard up from this, can further prevent moreover that water, dust etc. from entering into and holding in the chamber 177 to further improve battery module 1's insulating properties and protection level.

As shown in fig. 1, 8 and 10, the housing 171 may have first and second ends opposite in the third direction, and the housing 17 may further include first and second end caps 172 and 173. A first end cap 172 may be provided on the first end portion of the housing 171, and the first end cap 172 may cover a first end of the receiving cavity 177. A second end cap 173 may be provided on a second end of the case 171, and the second end cap 173 may cover a second end of the receiving cavity 177. At least one of the first end cap 172 and the second end cap 173 may have a glue filling hole 174 communicating with the accommodating chamber 177. The insulating paste can be poured into the accommodating cavity 177 through the paste pouring hole 174 to form the insulating paste layer 18.

Preferably, the housing 17 may further include a first sealing ring 175 and a second sealing ring 176, the first sealing ring 175 may be disposed between the first end cap 172 and the first end portion of the housing 171 to seal the first end of the receiving cavity 177, and the second sealing ring 176 may be disposed between the second end cap 173 and the second end portion of the housing 171 to seal the second end of the receiving cavity 177. Wherein the first sealing ring 175 may be disposed around the first end of the accommodating chamber 177, and the second sealing ring 176 may be disposed around the second end of the accommodating chamber 177.

The housing 171, the first end cap 172, the second end cap 173, the first sealing ring 175, and the second sealing ring 176 may define a sealed accommodating cavity 177, so that when the insulating adhesive is poured into the accommodating cavity 177 through the adhesive pouring hole 174, the insulating adhesive is prevented from flowing out of the accommodating cavity 177.

Moreover, by providing the first seal ring 175 and the second seal ring 176, the housing 17 does not need to be sealed by hot melt adhesive, and thus the manufacturing cost of the battery module 1 can be reduced, the manufacturing efficiency of the battery module 1 can be improved, and the labor cost can be reduced.

As shown in fig. 10, in an example of the present invention, a first surface of the first end cover 172 opposite to the housing 171 may be provided with a first catching groove, and a first surface of the first end portion of the housing 171 opposite to the first end cover 172 may be provided with a second catching groove. For example, the first locking groove may be provided on a right side surface of the first cap 172, and the second locking groove may be provided on a left side surface of the housing 171.

The first seal ring 175 may include a first seal ring 1751 and a second seal ring 1752. A part of the first seal ring 1751 may be engaged with the first groove, another part of the first seal ring 1751 may be engaged with the second groove, and the extending direction of the first seal ring 1751 may be the same as (the same as) the third direction (the longitudinal direction of the housing 171).

An outer circumferential surface of the second seal ring 1752 may be provided on an inner circumferential surface of the first seal ring 1751, and an extending direction of the second seal ring 1752 may be perpendicular to the extending direction of the first seal ring 1751. Wherein a second seal ring 1752 may be provided between the first end cap 172 and the first end portion of the housing 171, the second seal ring 1752 may be in contact with each of the first surface of the first end cap 172 and the first surface of the first end portion of the housing 171. The sealing performance of the receiving cavity 177 can be further improved.

Preferably, a first layer of sealant may be disposed between the second seal ring 1752 and the first surface of the first end cap 172, and a second layer of sealant may be disposed between the second seal ring 1752 and the first surface of the first end portion of the housing 171.

As shown in fig. 10, a first surface of the second end cap 173 opposite to the case 171 may be provided with a third catching groove, and a first surface of the second end portion of the case 171 opposite to the second end cap 173 may be provided with a fourth catching groove. For example, the third locking groove may be provided on the left side surface of the second end cap 173, and the fourth locking groove may be provided on the right side surface of the housing 171.

The second seal ring 176 may include a third seal ring 1761 and a fourth seal ring 1762. A portion of third seal ring 1761 may be engaged in the third groove and another portion of third seal ring 1761 may be engaged in the fourth groove. The extending direction of the third seal ring 1761 may coincide with (be the same as) the third direction (the longitudinal direction of the housing 171).

An outer circumferential surface of the fourth seal ring 1762 may be provided on an inner circumferential surface of the third seal ring 1761, and an extending direction of the fourth seal ring 1762 may be perpendicular to an extending direction of the third seal ring 1761. Wherein a fourth seal ring 1762 may be provided between the second end cap 173 and the second end of the housing 171, the fourth seal ring 1762 may be in contact with each of the first surface of the second end cap 173 and the first surface of the second end of the housing 171. The sealing performance of the receiving cavity 177 can be further improved.

Preferably, a third layer of sealant may be disposed between fourth seal ring 1762 and the first surface of second end cap 173, and a fourth layer of sealant may be disposed between fourth seal ring 1762 and the first surface of the second end portion of housing 171.

As shown in fig. 1, 7 and 8, the housing 171 is provided with at least one glue overflow opening 178. From this not only can in time discharge the air that holds in the chamber 177 to prevent to be too big at the pressure in the in-process shell 17 that pours the insulating cement, can also flow out through whether having the insulating cement and overflow gluey mouth 178, judge whether the insulating cement 18 is full of and hold the chamber 177, judge whether the insulating cement is full of and hold the chamber 177 promptly.

Preferably, at least one of the first wall surface and the second wall surface of the receiving cavity 177 may be provided with a glue overflow opening 178, and the glue overflow opening 178 may penetrate along the first direction. Specifically, the upper wall surface (the first wall surface) of the accommodating cavity 177 may be provided with a plurality of glue outlets 178, and each glue outlet 178 may penetrate the top plate of the housing 171 in the up-down direction.

As shown in fig. 8 and 9, each of the first end cap 172 and the second end cap 173 may include a cover 1721, and the cover 1721 may have first and second opposite end faces 1725 and 1721 in a thickness direction thereof (e.g., the third direction).

The cover 1721 of at least one of the first end cap 172 and the second end cap 173 is provided with a glue filling hole 174 penetrating along a thickness direction (e.g., the third direction), a first end face 1725 of the cover 1721 of the at least one of the first end cap 172 and the second end cap 173 may be provided with a plurality of glue guiding grooves 1724, the plurality of glue guiding grooves 1724 may be radially disposed relative to the glue filling hole 174, and a first end (e.g., an inner end) of each glue guiding groove 1724 may be engaged with the glue filling hole 174.

Through setting up a plurality of glue guide grooves 1724 that are radially arranged relative to glue filling hole 174 on lid 1721 to can make the insulating glue that enters into in the shell 17 by glue filling hole 174 enter into a plurality of glue guide grooves 1724, and flow along a plurality of glue guide grooves 1724, so that can make the insulating glue that enters into in the shell 17 by glue filling hole 174 can flow along a plurality of directions (the extending direction of a plurality of glue guide grooves 1724) simultaneously, can make the insulating glue that enters into in the shell 17 by glue filling hole 174 evenly distribute to holding in the chamber 177.

Because the insulating cement that enters into in the shell 17 from encapsulating hole 174 can flow to a plurality of directions simultaneously, consequently not only can be with faster speed to encapsulating hole 174 in inject insulating cement, can make insulating cement be full of more fast moreover and hold chamber 177, can improve encapsulating speed and encapsulating efficiency from this.

The first end of each glue guide 1724 may be spaced a predetermined distance from the glue hole 174, i.e., the first end of each glue guide 1724 is not immediately adjacent to the glue hole 174.

This prevents the insulating adhesive entering the housing 17 through the adhesive filling hole 174 from flowing only along one or more of the plurality of adhesive guide grooves 1724, so that the accommodating chamber 177 can be filled with the insulating adhesive more quickly, and the adhesive filling speed and efficiency can be further improved. Preferably, the first end of each glue guide groove 1724 may be spaced 0.5 mm-2 mm from the glue hole 174.

A second end of each glue guide slot 1724 may be adjacent to a rim of the first end face 1725 of the cover 1721. From this can make the insulating cement along leading gluey groove 1724 flow to the border that holds chamber 177 to can make the insulating cement distribute more evenly in holding chamber 177, so that make the insulating cement be full of more fast and hold chamber 177, and then can further improve encapsulating speed and encapsulating efficiency. The first end of each glue guide slot 1724 may be an inner end of the glue guide slot 1724 and the second end of each glue guide slot 1724 may be an outer end of the glue guide slot 1724.

As shown in fig. 9, the first end face 1725 of the cover 1721 of the at least one of the first end cap 172 and the second end cap 173 may further have a glue receiving slot 179 formed thereon, the glue receiving slot 179 may be adjacent to the glue filling hole 174, the glue receiving slot 179 may be disposed around the glue filling hole 174, and the first end of each glue guiding slot 1724 may be connected to the glue receiving slot 179.

The insulation paste entering the housing 17 through the glue filling hole 174 enters the glue containing groove 179 first, and then enters each glue guide groove 1724, that is, the insulation paste in the glue containing groove 179 can enter each glue guide groove 1724. From this can make the insulating cement that enters into in the shell 17 by encapsulating hole 174 enter into every glue guide groove 1724 more evenly to can make the insulating cement be full of more fast and hold chamber 177, so that can further improve encapsulating speed and encapsulating efficiency.

As shown in fig. 9, the at least one of the first end cap 172 and the second end cap 173 may further include a stopper 1722, the stopper 1722 may be disposed on the first end surface of the cover 1721, and the stopper 1722 may be located below the glue filling hole 174.

The insulating paste tends to flow downward under its own weight. By providing a stopper 1722 below the glue filling hole 174, the insulation glue can be blocked from flowing downward. From this can make by encapsulating hole 174 enter into the insulating cement in the shell 17 distribute more evenly to hold the chamber 177 in to can make the insulating cement be full of more fast and hold the chamber 177, and then can further improve encapsulating speed and encapsulating efficiency.

Preferably, the stopper 1722 may be adjacent to the glue hole 174, thereby better blocking the insulation glue from flowing downward. More preferably, the stopper 1722 may have a preset height, whereby the insulation paste may be better blocked from flowing downward.

As shown in fig. 9, the at least one of the first end cap 172 and the second end cap 173 may further include a plurality of protrusions 1723, the plurality of protrusions 1723 may be disposed on the first end surface of the cover 1721, and the plurality of protrusions 1723 may be disposed around the glue filling hole 174. Wherein, a glue guiding groove 1724 can be defined between two adjacent protrusions 1723, a first end of each protrusion 1723 can be spaced from the glue filling hole 174 by a predetermined distance so as to form the glue containing groove 179, and a second end of each protrusion 1723 can be adjacent to an edge of the first end surface of the cover 1721. Thereby, the difficulty of manufacturing the at least one of the first and second end caps 172 and 173 may be reduced.

Preferably, a stop 1722 and a plurality of protrusions 1723 may be disposed around the glue hole 174. One glue guiding groove 1724 can be defined between the stopping block 1722 and one projection 1723, and another glue guiding groove 1724 can be defined between the stopping block 1722 and another projection 1723.

As shown in fig. 9, specifically, a glue guiding groove 1724 extending in a vertical direction, a glue guiding groove 1724 extending in a substantially horizontal direction, and a glue guiding groove 1724 extending obliquely upward may be defined between two adjacent protrusions 1723, and a glue guiding groove 1724 extending obliquely downward may be defined between the protrusions 1723 and the stopping block 1722.

As shown in fig. 16 to 18, the battery system 100 may include a mounting case 2, a battery module 1, a heat exchanging device 3, and an elastic member 4, and the heat exchanging device 3 may be a liquid cooling device. The mounting case 2 may have therein a mounting cavity 23, the mounting cavity 23 may have a first wall surface 231 and a second wall surface 232 opposite in the first direction (e.g., up-down direction), the battery module 1 may be provided in the mounting cavity 23, and the heat exchanging device 3 may be provided in the mounting cavity 23. The heat exchanging device 3 may be located between the battery module 1 and a first wall 231 (e.g., a bottom wall) of the mounting cavity 23 in the first direction, and the battery module 1 may be in contact with the heat exchanging device 3. That is, the battery module 1 may be located between the heat exchanging device 3 and the second wall surface 232 of the mounting cavity 23 in the first direction.

The elastic member 4 may be disposed between the heat exchanging device 3 and the first wall 231 of the mounting cavity 23 in the first direction and/or between the battery module 1 and the second wall 232 of the mounting cavity 23 in the first direction. The elastic member 4 may be in contact with each of the heat exchanging device 3 and the first wall 231 of the mounting cavity 23 and/or the elastic member 4 may be in contact with each of the battery module 1 and the second wall 232 of the mounting cavity 23, and the elastic member 4 may be in a compressed state.

In other words, the elastic member 4 may be provided between the heat exchanging device 3 and the first wall 231 of the mounting cavity 23, or the elastic member 4 may be provided between the battery module 1 and the second wall 232 of the mounting cavity 23. In addition, an elastic member 4 may be disposed between the heat exchanging device 3 and the first wall 231 of the mounting cavity 23, and an elastic member 4 may be disposed between the battery module 1 and the second wall 232 of the mounting cavity 23.

By providing the elastic member 4 in a compressed state between the heat exchanging device 3 and the first wall 231 of the mounting cavity 23 and/or providing the elastic member 4 in a compressed state between the battery module 1 and the second wall 232 of the mounting cavity 23, the elastic member 4 can apply an elastic force to the heat exchanging device 3 toward the battery module 1 and/or apply an elastic force to the battery module 1 toward the heat exchanging device 3.

As shown in fig. 17 and 18, the elastic member 4 may be an elastic plate or an elastic layer. Preferably, the compression of the elastic member 4 may be 20% -60% and/or the compression stress of the elastic member 4 may be 30 kpa-90 kpa. Not only can the heat exchanging device 3 and the battery module 1 be ensured to be in close and effective contact, but also the elastic member 4 can be prevented from being elastically failed.

More preferably, the compression of the elastic member 4 may be 30% -50% and/or the compression stress of the elastic member 4 may be 45 kpa-75 kpa. Further preferably, the compression of the elastic member 4 may be 40% and/or the compression stress of the elastic member 4 may be 62 kpa. Not only can the heat exchanging device 3 and the battery module 1 be further ensured to be in close and effective contact, but also the elastic member 4 can be further prevented from being elastically failed.

As shown in fig. 17 and 18, the battery system 100 may further include a first flexible material layer 5, the first flexible material layer 5 may be disposed between the heat exchanging device 3 and the first wall 231 of the mounting cavity 23 in the first direction, the first flexible material layer 5 may be in contact with the first wall 231 of the mounting cavity 23, and the first flexible material layer 5 may be in contact with one of the heat exchanging device 3 and the elastic member 4. Specifically, when the elastic member 4 is disposed between the heat exchanging device 3 and the first wall 231 of the installation cavity 23, the first flexible material layer 5 may be in contact with the elastic member 4, that is, the elastic member 4 may be located between the heat exchanging device 3 and the first flexible material layer 5 in the first direction, and when the elastic member 4 is not disposed between the heat exchanging device 3 and the first wall 231 of the installation cavity 23, the first flexible material layer 5 may be in contact with the heat exchanging device 3.

By arranging the first flexible material layer 5 between the heat exchanging device 3 and the first wall 231 of the installation cavity 23, rigid friction between the heat exchanging device 3 and the installation shell 2 (such as the chassis 21) can be avoided, and thus leakage of the heat exchanging device 3 can be prevented.

The first layer of flexible material 5 may be an insulating layer. From this can utilize first flexible material layer 5 to block external heat to prevent that external heat from transmitting heat transfer device 3, thereby can avoid the temperature of the coolant liquid in heat transfer device 3 to rise or reduce, and then can improve heat transfer device 3's cooling effect or heating effect, so that can further ensure that the temperature of battery module 1 is in operating temperature range all the time.

Preferably, a first fireproof adhesive layer may be disposed between the first flexible material layer 5 and the first wall 231 of the installation cavity 23, and a second fireproof adhesive layer may be disposed between the first flexible material layer 5 and the one of the heat exchanging device 3 and the elastic member 4. That is, the first flexible material layer 5 may be bonded to the first wall 231 of the installation cavity 23 by the first fireproof adhesive layer, and the first flexible material layer 5 may be bonded to the one of the heat exchanging device 3 and the elastic member 4 by the second fireproof adhesive layer. When the elastic member 4 is disposed between the heat exchanging device 3 and the first wall 231 of the installation cavity 23, a third fireproof adhesive layer may be disposed between the elastic member 4 and the heat exchanging device 3.

As shown in fig. 17 and 18, the battery system 100 may further include a second flexible material layer 6, the second flexible material layer 6 may be disposed between the battery module 1 and the heat exchange device 3 in the first direction, and the second flexible material layer 6 may be in contact with each of the battery module 1 and the heat exchange device 3.

Through set up second flexible material layer 6 between heat transfer device 3 and battery module 1 to can avoid producing rigid friction between heat transfer device 3 and the battery module 1, can prevent from heat transfer device 3 weeping from this.

The second layer of flexible material 6 may be a heat conducting layer. From this can promote the heat transfer between battery module 1 and heat transfer device 3 through second flexible material layer 6 to can make heat transfer device 3 cool off or heat battery module 1 more effectively, can further ensure that the temperature of battery module 1 is in operating temperature range all the time, and then ensure that battery module 1 and battery system 100 performance are more stable, are in good operating condition all the time.

Preferably, a seventh fireproof glue layer may be disposed between the second flexible material layer 6 and the battery module 1, and an eighth fireproof glue layer may be disposed between the second flexible material layer 6 and the heat exchange device 3. In other words, the second flexible material layer 6 can be bonded to the battery module 1 through the seventh fireproof adhesive layer, and the second flexible material layer 6 can be bonded to the heat exchange device 3 through the eighth fireproof adhesive layer.

When being equipped with elastic component 4 between the second wall 232 of battery module 1 and installation cavity 23, can be equipped with the fifth fire prevention glue film between elastic component 4 and the battery module 1, can be equipped with the sixth fire prevention glue film between the second wall 232 of elastic component 4 and installation cavity 23. In other words, the elastic member 4 can be bonded to the battery module 1 through the fifth fireproof adhesive layer, and the elastic member 4 can be bonded to the second wall surface 232 of the mounting cavity 23 through the sixth fireproof adhesive layer.

When the elastic member 4 is arranged between the heat exchange device 3 and the first wall 231 of the installation cavity 23 and the first flexible material layer 5 is not arranged between the heat exchange device 3 and the first wall 231 of the installation cavity 23, a third fireproof adhesive layer can be arranged between the elastic member 4 and the heat exchange device 3, and a fourth fireproof adhesive layer can be arranged between the elastic member 4 and the first wall 231 of the installation cavity 23.

As shown in fig. 17 and 18, in one embodiment of the present invention, the battery module 1 may be plural, the elastic member 4 may be plural, and the plural elastic members 4 may be provided at intervals. Wherein each battery module 1 is opposite to at least two elastic members 4 in the first direction.

The at least two elastic members 4 can thereby apply elastic force toward the battery module 1 to the portion of the heat exchanging device 3 opposite to the battery module 1 in the first direction, so that the portion of the heat exchanging device 3 opposite to the battery module 1 in the first direction and the battery module 1 can be brought into closer and more effective contact. And/or, the at least two elastic members 4 may apply an elastic force to the battery module 1 toward the heat exchanging device 3, so that a portion of the heat exchanging device 3 opposite to the battery module 1 in the first direction and the battery module 1 may be brought into more close and effective contact. Whereby heat can be efficiently transferred between the battery module 1 and the heat exchanging device 3.

Preferably, the plurality of elastic members 4 may be located on the same plane.

As shown in fig. 16, the battery system 100 may further include a mounting beam 7, the mounting beam 7 may be provided on the first wall surface 231, and the battery module 1 may be detachably mounted on the mounting beam 7 by a fastener. Whereby the battery module 1 can be more conveniently and more stably mounted in the mounting cavity 23.

Preferably, the first wall 231 may be a surface of the bottom chassis 21, and the second wall 232 may be a surface of the cover plate 22.

One of the wall surface of the mounting cavity 23 and the heat exchange device 3 can be provided with a clamping groove, and the other of the wall surface of the mounting cavity 23 and the heat exchange device 3 is provided with a clamping protrusion which can be matched in the clamping groove. This makes it possible to limit the heat exchanger 3 in a plane perpendicular to the first direction, and thus to stabilize the structure of the battery system 100.

As shown in fig. 19-21, in some examples of the invention, the mounting housing 2 may include a chassis 21, a cover plate 22, mounting posts 24, and a seal 25. The cover 22 may be disposed on the chassis 21, and the cover 22 and the chassis 21 may define a mounting cavity 23 therebetween, and the mounting cavity 23 may have a first wall 231 and a second wall 232 opposite to each other in the first direction (e.g., a height direction of the mounting cavity 23). The second wall 232 (e.g., the top wall) may have a first through hole 221 formed therein. The mounting post 24 may be disposed on a first wall 231 (e.g., a bottom wall) of the mounting cavity 23, and a portion of the mounting post 24 may pass through the first through hole 221 so as to protrude out of the mounting cavity 23.

The seal 25 may include a sealing portion 251 and a connecting portion 252, the sealing portion 251 may be located outside the mounting cavity 23, and the sealing portion 251 may be provided on the portion of the mounting post 24. The connecting portion 252 may be connected to the sealing portion 251, and the first portion 2521 of the connecting portion 252 may pass through the first through hole 221 and protrude into the mounting cavity 23, i.e., the first portion 2521 of the connecting portion 252 may be located in the mounting cavity 23. The first portion 2521 of the connection portion 252 can be connected to the mounting post 24. The sealing portion 251 can be in sealing contact with the one of the cover plate 22 and the chassis 21 (i.e., the one provided with the first through hole 221) and/or the mounting post 24 can be in sealing contact with the second wall surface 232 of the mounting cavity 23.

Since the sealing portion 251 can be in sealing contact with the one (i.e., the one provided with the first through hole 221) of the cover plate 22 and the bottom plate 21, the edge of the sealing portion 251 may be located outside the edge of the first through hole 221, i.e., the edge of the sealing portion 251 may surround the first through hole 221, so as to prevent foreign matter (e.g., water) from entering the installation cavity 23 through the first through hole 221.

Since the mounting post 24 can be in sealing contact with the second wall surface 232 of the mounting cavity 23, the edge of the mounting post 24 can be located outside the edge of the first through hole 221, that is, the edge of the mounting post 24 can surround the first through hole 221, so as to prevent external impurities (such as water) from entering the mounting cavity 23 through the first through hole 221.

In order to make the electric vehicle have a larger driving range and less frequent charging, the electric quantity of the battery system can only be increased, i.e. the battery system comprises more battery modules, which results in that the battery system is more flat under the condition that the height of the battery system (i.e. the X direction of the whole vehicle) is limited. For a flattened battery system, if only the hoisting points are arranged on the circumferential edge of the battery system, the modal requirement of the battery system cannot be met, and the installation strength of the battery system cannot be met.

The mounting case 2 according to the embodiment of the present invention is provided with the mounting posts 24 on the first wall surface 231 of the mounting cavity 23, so that the strength requirement of the flattened battery system 100 can be satisfied by attaching the mounting posts 24 to the body of the electric vehicle.

Further, by providing the sealing member 25 and bringing the sealing portion 251 into sealing contact with one of the cover plate 22 and the chassis 21 and/or the mounting post 24 into sealing contact with the second wall surface 232 of the mounting cavity 23, the first through hole 221 can be sealed, whereby the sealing performance and the safety performance of the mounting case 2 and the battery system 100 can be improved.

The battery system 100 may be flat. Specifically, the ratio of the length and height of the chassis 21 may be (8-12): 1, the ratio of the width to the height of the chassis 21 may be (6-10): 1, the ratio of the length to the height of the cover 22 may be (8-12): 1, the ratio of the width to the height of the cover 22 may be (6-10): 1. that is, the ratio of the length to the height of the mounting housing 2 may be substantially (8-12): 1, the ratio of the width to the height of the mounting housing 2 may be substantially (6-10): 1, the ratio of the length to the height of the mounting cavity 23 may be substantially (8-12): 1, the ratio of the width to the height of the mounting cavity 23 may be substantially (6-10): 1.

the invention also provides a battery system 100, wherein the battery system 100 can comprise a mounting shell 2 and a battery module 1, and the battery module 1 can be arranged in the mounting cavity 23 of the mounting shell 2. The battery system 100 according to the embodiment of the invention has the advantages of high installation strength, good sealing performance and the like.

The present invention also provides an electric vehicle including a vehicle body and the battery system 100, and the battery system 100 may be provided on the vehicle body. Preferably, the vehicle body may have a lifting beam 200, and the mounting post 24 of the mounting case 2 of the battery system 100 may be connected to the lifting beam 200.

As shown in fig. 19 to 21, the part of the mounting post 24 passes through the hoist beam 200, and the seal portion 251 is located between the hoist beam 200 and the cover plate 22 in the height direction of the mounting chamber 23. Since the seal portion 251 is located between the hoist beam 200 and the cover plate 22 in the height direction (the first direction) of the mounting cavity 23, the hoist beam 200 may be spaced apart from the cover plate 22, that is, the hoist beam 200 may be spaced apart from the mounting case 2, whereby it is possible to avoid affecting the performance of the electric vehicle such as collision, extrusion, and the like.

Preferably, the electric vehicle may further include a mounting member (e.g., a nut) capable of being threadedly fitted over the portion of the mounting column 24, and the hoist beam 200 may be located between the mounting member and the sealing portion 251 in the height direction of the mounting cavity 23. Specifically, the mounting member may be located above the hoist beam 200, the sealing portion 251 may be located below the hoist beam 200, the mounting member may abut against the hoist beam 200, the sealing portion 251 may abut against the hoist beam 200, and the sealing portion 251 may abut against one of the cover plate 22 and the chassis 21. The mounting member may be a second clamping member 244.

The first wall 231 of the mounting cavity 23 may be provided with a second through hole. As shown in fig. 20 and 21, the mounting post 24 may include a post 241, a mounting portion 242, a first clamp 243, and a second clamp 244. The cylinder 241 may be provided on the first wall 231 of the mounting cavity 23, the cylinder 241 may have a third through hole penetrating the cylinder 241 in the height direction thereof, that is, the cylinder 241 may have a third through hole penetrating the cylinder 241 in the first direction (for example, the vertical direction), and the cylinder 241 may be in sealing contact with the second wall 232. Specifically, the upper surface of the cylinder 241 can be in sealing contact with the second wall 232. The first wall 231 may be a part of the surface of the bottom plate 21, and the second wall 232 may be a part of the surface of the cover plate 22.

The mounting portion 242 can pass through the first through hole 221, the second through hole, and the third through hole, that is, the mounting portion 242 can pass through the bottom chassis 21, the cylinder 241, and the cover plate 22. That is, the first through hole 221, the second through hole, and the third through hole are generally opposite in the first direction. Since the pillar 241 is disposed on the first wall 231 of the mounting cavity 23, and the second through hole and the third through hole are substantially opposite to each other in the first direction, the edge of the pillar 241 may be located outside the edge of the second through hole, that is, the edge of the pillar 241 may surround the second through hole, otherwise the pillar 241 cannot be disposed on the first wall 231 of the mounting cavity 23.

The cylinder 241 can be welded to the first wall 231 of the mounting cavity 23; alternatively, a sealing ring may be disposed between the cylinder 241 and the first wall 231 of the mounting cavity 23; or the cylinder 241 and the first wall 231 of the mounting cavity 23 may be integrally formed to prevent foreign materials (e.g., water) from entering the mounting cavity 23 through the second through hole.

A portion 2421 of the mounting part 242 can pass through the first through hole 221 so as to protrude out of the mounting cavity 23. Wherein the sealing portion 251 can be sleeved on a portion 2421 of the mounting portion 242.

The first clamping member 243 and the second clamping member 244 can be provided on the mounting portion 242, and at least one of the first clamping member 243 and the second clamping member 244 can be threaded on the mounting portion 242. Wherein the first clamp 243 can abut on the other one of the base plate 21 and the cover plate 22 (i.e., the one not provided with the first through hole 221) or the cylinder 241.

As shown in fig. 19 to 21, specifically, the mounting portion 242 can pass through the hoist beam 200, the first clamp 243 can abut on the column 241, and the second clamp 244 can abut on the hoist beam 200. In other words, the cylinder 241, the cover plate 22, the sealing part 251 and the hoist beam 200 can be clamped between the first and

second clamps

243 and 244. Therefore, the battery system 100 can be conveniently and stably installed on the hoisting beam 200, and the battery system 100 can be conveniently and easily replaced.

As shown in fig. 21, the second clamping member 244 may be located above the lifting beam 200, the lifting beam 200 may be located above the sealing portion 251, the sealing portion 251 may be located above the cover plate 22, the cover plate 22 may be located above the column 241, the column 241 may be located above the base plate 21, and the base plate 21 may be located above the first clamping member 243.

Preferably, the first clamping member 243 and the mounting portion 242 may be integrally formed to constitute a bolt, and the second clamping member 244 may be a nut. The cylinder 241 may be provided with a receiving groove, and the first clamping member 243 may be disposed in the receiving groove. This can prevent the first clamp 243 from interfering with and rubbing against other components of the electric vehicle.

As shown in fig. 20 and 21, the connecting portion 252 can be fitted over the mounting portion 242. In a specific example of the present invention, the wall surface of the third through hole may be provided with an internal thread, the circumferential surface of at least a portion of the first portion 2521 of the connection portion 252 may be provided with an external thread capable of being engaged with the internal thread, and the first portion 2521 of the connection portion 252 may be engaged in the third through hole by the internal thread and the external thread. In other words, the first portion 2521 of the connection portion 252 may be screw-fitted in the third through hole.

Specifically, the first portion 2521 of the connection portion 252 may pass through the first through hole 221 so as to protrude into the third through hole. Since the first portion 2521 of the connection portion 252 is screw-fitted in the third through-hole, by rotating the connection portion 252 (the sealing portion 251 rotates along with the connection portion 252), the sealing portion 251 can be moved in a direction adjacent to the one of the cover plate 22 and the chassis 21 (i.e., the one provided with the first through-hole 221), and then the sealing portion 251 can be brought into contact with the one of the cover plate 22 and the chassis 21. As the sealing portion 251 is further moved, the sealing portion 251 may press the one of the cover 22 and the bottom chassis 21 (e.g., the cover 22) in a direction adjacent to the cylinder 241 until the one of the cover 22 and the bottom chassis 21 (e.g., the cover 22) is in sealing contact with the cylinder 241, i.e., the second wall surface 232 is in sealing contact with the cylinder 241.

Specifically, the first through hole 221 may be disposed on the cover plate 22, and the first through hole 221 may penetrate the cover plate 22 along the first direction.

As shown in fig. 20 and 21, the mounting housing 2 may further include a sealing ring 26, and the sealing ring 26 may be disposed between the cylinder 241 and the second wall surface 232. Whereby the sealing performance of the mounting case 2 and the battery system 100 can be further improved. It will be appreciated by those skilled in the art that the outer edge of the sealing ring 26 may be located outside the edge of the first through hole 221, i.e. the outer edge of the sealing ring 26 may surround the first through hole 221.

Since the one of the cover plate 22 and the base plate 21 is pressed against the gasket 26 by the sealing portion 251, that is, the one of the cover plate 22 and the base plate 21 does not rotate relative to the gasket 26, the one of the cover plate 22 and the base plate 21 does not wear the surface of the gasket 26, thereby not affecting the sealing performance of the gasket 26, and thus the sealing performance of the mounting case 2 and the battery system 100 can be further improved.

A sealing ring may be disposed between the sealing portion 251 and the one of the cover plate 22 and the bottom plate 21, and since the sealing portion 251 rotates when moving to a direction adjacent to the one of the cover plate 22 and the bottom plate 21, the surface of the sealing ring is worn by the sealing portion 251, which results in a reduction in sealing performance of the sealing ring.

Preferably, the cross section of the sealing portion 251 may be circular, the cross section of the connecting portion 252 may be circular, and the inner circumferential surface of the sealing portion 251 and the inner circumferential surface of the connecting portion 252 may be flush. The construction of the seal 25 can thereby be made more rational.

As shown in fig. 19 and 20, the mounting post 24 may be provided in plural, and the plural mounting posts 24 may be provided on the first wall 231 of the mounting cavity 23 at intervals along the longitudinal direction of the chassis 21. This can further improve the mounting strength of the flattened battery system 100.

Preferably, each mounting post 24 may be located at a middle portion of the first wall 231 in the width direction of the chassis 21. The structure of the mounting housing 2 can thereby be made more rational. The length direction of the chassis 21, the length direction of the cover plate 22, the length direction of the mounting cavity 23, and the length direction of the mounting case 2 may be the same, and the width direction of the chassis 21, the width direction of the cover plate 22, the width direction of the mounting cavity 23, and the width direction of the mounting case 2 may be the same.

A plurality of battery modules 1 may be provided in the mounting cavity 23, and the plurality of battery modules 1 may be located on both sides of the plurality of mounting posts 24 in the width direction of the chassis 21.

As shown in fig. 20, the mounting case 2 may further include at least one first reinforcement 271 and two second reinforcements 272. The plurality of mounting posts 24 and the at least one first reinforcement 271 may be alternately arranged along the length direction of the chassis 21. In other words, a first reinforcement 271 may be disposed between two adjacent mounting posts 24. Wherein each first reinforcement 271 is provided on the first wall 231, each first reinforcement 271 may be connected to each of the two adjacent mounting posts 24.

Each of the second reinforcing members 272 may be provided on the first wall 231, and the mounting cavity 23 has third and fourth walls opposite in the longitudinal direction of the chassis 21. Wherein one second stiffener 272 may be attached to each of the third wall and the mounting post 24 adjacent the third wall and another second stiffener 272 may be attached to each of the fourth wall and the mounting post 24 adjacent the fourth wall. Thereby, the structural strength of the mounting case 2 and the battery system 100 can be further improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either mechanically or in conjunction or communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A battery system, comprising:

the mounting structure comprises a mounting shell, a first connecting piece and a second connecting piece, wherein a mounting cavity is formed in the mounting shell, and the mounting cavity is provided with a first wall surface and a second wall surface which are opposite in a first direction;

the battery module, the battery module is established the installation intracavity, the battery module includes a plurality of battery modules, every the battery module includes:

a plurality of cells, each of the cells including a body having first and second ends opposite in a length direction thereof and first and second end faces opposite in a width direction thereof, a positive tab disposed at the first end and a negative tab disposed at the second end, a center line of each of the positive and negative tabs being located between the first end face and a length center line of the body in the width direction thereof, the center line of each of the positive and negative tabs extending in the length direction of the body;

a positive electrode bus bar including a positive electrode bar body and a plurality of positive electrode connecting portions, the positive electrode bar body being located between the center line of the positive electrode tab and the second end surface in the width direction of the body, the plurality of positive electrode connecting portions being provided on the positive electrode bar body at intervals in the thickness direction of the body, wherein the positive electrode tabs of the plurality of cells are connected to the plurality of positive electrode connecting portions; and

a negative electrode bus bar including a negative electrode bar body and a plurality of negative electrode connection portions, the negative electrode bar body being located between the center line of the negative electrode tab and the second end surface in the width direction of the body, the plurality of negative electrode connection portions being provided on the negative electrode bar body at intervals in the thickness direction of the body, the negative electrode tabs of the plurality of batteries being connected to the plurality of negative electrode connection portions, the plurality of battery modules being connected in series, the positive electrode bus bar of one of two adjacent battery modules being connected to the negative electrode bus bar of the other of the two adjacent battery modules;

the heat exchange device is arranged in the installation cavity, is positioned between the battery module and the first wall surface of the installation cavity in the first direction, and is in contact with the battery module; and

the elastic piece is arranged between the heat exchange device and the first wall surface of the installation cavity in the first direction and/or between the battery module and the second wall surface of the installation cavity in the first direction, and is in contact with each of the heat exchange device and the first wall surface of the installation cavity and/or in contact with each of the battery module and the second wall surface of the installation cavity, wherein the elastic piece is in a compressed state.

2. The battery system of claim 1, wherein the elastic member is an elastic plate or an elastic layer.

3. The battery system according to claim 1, wherein the battery module is plural, the elastic member is plural, and the elastic members are provided at intervals, wherein each of the battery modules is opposed to at least two of the elastic members in the first direction.

4. A battery system according to any of claims 1-3, characterized in that the compression of the elastic member is 20-60% and/or the compression stress of the elastic member is 30-90 kpa.

5. The battery system of claim 1, further comprising a first flexible material layer disposed between the heat exchanging device and the first wall of the mounting cavity in the first direction, the first flexible material layer contacting the first wall of the mounting cavity, the first flexible material layer contacting one of the heat exchanging device and the elastic member, wherein the first flexible material layer is a thermal insulation layer.

6. The battery system of claim 1, further comprising a second layer of flexible material disposed between the battery module and the heat exchange device in the first direction, the second layer of flexible material in contact with each of the battery module and the heat exchange device, wherein the second layer of flexible material is a thermally conductive layer.

7. The battery system according to claim 1, wherein the center line of the positive electrode tab is spaced from the length center line of the body by a first distance in a width direction of the body, and the center line of the negative electrode tab is spaced from the length center line of the body by a second distance in the width direction of the body, wherein a ratio of the first distance to the width of the body is greater than zero and equal to or less than 0.3, and a ratio of the second distance to the width of the body is greater than zero and equal to or less than 0.3.

8. The battery system according to claim 1,

the first end of each positive electrode connecting part is connected with the positive electrode row body, a positive electrode lug penetrating groove is defined between every two adjacent positive electrode connecting parts, and the end part, far away from the positive electrode row body, of each positive electrode lug penetrating groove is open;

the first end of each negative electrode connecting part is connected with the negative electrode row body, a negative electrode tab penetrating groove is defined between every two adjacent negative electrode connecting parts, and the end part, far away from the negative electrode row body, of each negative electrode tab penetrating groove is open.

9. The battery system according to claim 8,

the positive electrode connecting part is arranged between every two adjacent positive electrode lugs, each positive electrode lug is provided with a positive electrode bending part, and the positive electrode bending part of each two adjacent positive electrode lugs is connected with the positive electrode connecting part;

the negative electrode connecting part is arranged between every two adjacent negative electrode lugs, each negative electrode lug is provided with a negative electrode bending part, and the negative electrode bending part of each of the two adjacent negative electrode lugs is connected with the negative electrode connecting part.

10. An electric vehicle, characterized by comprising:

a vehicle body; and

a battery system according to any one of claims 1 to 9, the battery system being provided on the vehicle body.