Battery Module

Abstract

The present application relates to the field of battery technology, and in particular to a battery module. The battery module includes a battery module body and an exhaust device arranged on the battery module body, the battery module body includes a plurality of battery modules, the exhaust device is provided with an exhaust inlet corresponding to the explosion-proof valve of each of the plurality of battery modules, the exhaust device is also provided with an exhaust outlet and an exhaust channel, the exhaust inlet and the exhaust outlet are respectively connected to the exhaust channel, when the gas is ejected from the explosion-proof valve, the gas enters the exhaust channel through the exhaust inlet, and then is discharged from the battery module through the exhaust outlet. Solve the problem that when the battery module has thermal runaway, the gas ejects from the explosion-proof valve, accumulates in the module and is difficult to be discharged, which is easy to cause explosion.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module. Background Art

[0002] In the existing square shell battery module, when the square shell battery cell has thermal runaway (when the battery is charged at a constant voltage, the current and battery temperature have a cumulative enhancement effect and gradually damage), the battery cell will produce gas. When the internal gas pressure of the battery cell reaches a certain level, the explosion-proof valve on the top of the battery cell will be opened, and the gas will be ejected from the explosion-proof valve. The ejected gas is high-temperature gas, which can generally reach above 230°C. When thermal runaway occurs, the gas can only be discharged through some structural gaps in the module. The exhaust efficiency is low and uncontrolled, which will cause two situations: 1. When the structural gap in the module is too small, a large amount of high-temperature gas will accumulate in the module in a short period of time, which is easy to cause a violent explosion. 2. When the high-temperature gas is ejected irregularly, it is easy to cause other battery cells to catch fire and explode.

[0003] Application Contents

[0004] In view of the shortcomings of the existing technology, the present application proposes a battery module, which aims to solve the problem that when the battery module experiences thermal runaway, gas sprays out from the explosion-proof valve, accumulates in the module and is difficult to discharge, which easily causes explosion.

[0005] The technical solution proposed in this application is:

[0006] A battery module comprises a battery module body and an exhaust device arranged on the battery module body, wherein the battery module body comprises a plurality of battery cell modules, the exhaust device is provided with an exhaust inlet corresponding to an explosion-proof valve of each of the plurality of battery cell modules, the exhaust device is further provided with an exhaust outlet and an exhaust channel, the exhaust inlet and the exhaust outlet are respectively connected to the exhaust channel, when gas is ejected from the explosion-proof valve, the gas enters the exhaust channel through the exhaust inlet, and then is discharged from the battery module through the exhaust outlet.

[0007] Further, the exhaust device includes an upper shell and a lower shell, the lower shell is arranged at the lower side of the upper shell, the exhaust channel is formed between the upper shell and the lower shell, the exhaust inlet is arranged at the lower side wall of the lower shell, and the exhaust outlet is arranged at the upper side wall of the upper shell, the battery module body includes a plurality of battery cell isolation sleeves, the plurality of battery cell isolation sleeves are arranged between every two battery cell modules among the plurality of battery cell modules, the lower shell is arranged on the plurality of battery cell isolation sleeves, the lower side wall of the lower shell is attached to the plurality of battery cell modules, and each explosion-proof valve is located in the corresponding exhaust inlet.

[0008] Further, the lower side wall of the upper shell is provided with a groove ring, and the upper side wall of the lower shell is provided with a raised ring matching with the groove ring, or the lower side wall of the upper shell is provided with a raised ring, and the upper side wall of the lower shell is provided with a raised ring and a groove ring matching with the raised ring, the groove ring is provided with a high-temperature glue layer, the raised ring is inserted into the groove ring, and the groove ring is bonded to the raised ring through the high-temperature glue layer.

[0009] Furthermore, the battery module also includes a sealing structure, and the sealing structure is arranged between the lower side wall of the lower shell and the multiple battery cell modules.

[0010] Furthermore, the sealing structure includes a sealing foam layer, the upper side wall of the sealing foam layer is provided with a first high-temperature tape layer, the lower side wall of the sealing foam layer is provided with a second high-temperature tape layer, the sealing foam layer, the first high-temperature tape layer and the second high-temperature tape layer are provided with first through holes at corresponding positions of each exhaust inlet, the first high-temperature tape layer is bonded to the lower side wall of the lower shell, and the second high-temperature tape layer is bonded to the multiple battery cell modules.

[0011] Furthermore, the exhaust device also includes an exhaust pipe, the upper side wall of the upper shell is provided with a mounting hole, the exhaust pipe is inserted into the mounting hole provided on the upper side wall of the upper shell and exposed to the battery module body, the exhaust pipe is connected to the exhaust channel, and the exhaust outlet is the pipe opening at the upper end of the exhaust pipe.

[0012] Furthermore, the exhaust device also includes multiple groups of mounting plates, each mounting plate is provided with a first mounting hole, each group of mounting plates consists of two mounting plates, which are respectively arranged on the two side walls of the upper shell and correspond to the position of a battery cell isolation sleeve, each group of mounting plates corresponds to a group of first mounting holes, one group of first mounting holes is a round hole, and the remaining groups of first mounting holes are waist-shaped holes, each battery cell isolation sleeve is provided with a group of second mounting holes corresponding to the group of first mounting holes, and the upper shell is connected to the battery cell isolation sleeve by screws passing through the first mounting holes and connecting with the second mounting holes.

[0013] Furthermore, the exhaust device also includes two groups of mounting plates, each mounting plate is provided with a first mounting hole, each group of mounting plates consists of two mounting plates, which are respectively provided on the two side walls of the upper shell and correspond to the position of a battery cell isolation sleeve, each group of mounting plates corresponds to a group of first mounting holes, one group of first mounting holes is a round hole, and the other group of first mounting holes is a waist-shaped hole, two of the multiple battery cell isolation sleeves are respectively provided with a group of second mounting holes corresponding to the group of first mounting holes, and the upper shell is connected to the battery cell isolation sleeve by screws passing through the first mounting holes and connecting with the second mounting holes, and the remaining battery cell isolation sleeves of the multiple battery cell isolation sleeves are respectively provided with a group of snap-fit ​​structures, and each group of snap-fit ​​structures respectively snaps on the two sides of the upper side wall of the upper shell.

[0014] Furthermore, each of the plurality of battery cell isolation sleeves is provided with a group of buckle structures, and each group of buckle structures is buckled with two sides of the upper side wall of the upper shell respectively.

[0015] Furthermore, a lower side wall of the lower shell is provided with a frame body surrounding each of the exhaust inlets, and a side wall of the frame body is provided with a plurality of first groove rings.

[0016] According to the above technical scheme, the present application has the beneficial effect: when the battery module has thermal runaway, the gas is ejected from the explosion-proof valve. Since an exhaust device is provided on the battery module body, the gas enters the exhaust channel through the exhaust inlet after being ejected, and then is discharged from the battery module through the exhaust outlet. The gas will not accumulate in the battery module and be difficult to discharge. The problem that when the battery module has thermal runaway, the gas ejected from the explosion-proof valve accumulates in the module and is difficult to discharge, which can easily cause an explosion is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a battery module provided by an embodiment of the present application;

[0018] Figure 2 is an exploded schematic diagram of a battery module provided by an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of the structure of the upper shell and the lower shell provided by the embodiment of the present application;

[0020] Figure 4 is an exploded schematic block diagram of another battery module provided by an embodiment of the present application;

[0021] Figure 5 It is a schematic block diagram of another battery module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a battery module 11, including a battery module body 11 and an exhaust device 12, and the exhaust device 12 is arranged on the battery module body 11.

[0024] The exhaust device 12 is provided with a plurality of exhaust inlets 121 , exhaust passages 122 and exhaust outlets 123 .

[0025] The battery module body 11 includes a plurality of battery cell modules 111 , and the battery cell modules 111 have explosion-proof valves 1111 .

[0026] The multiple exhaust inlets 121 correspond to the explosion-proof valve 1111 of each battery module 111 in the multiple battery modules 111, that is, the exhaust inlet 121 is installed at the explosion-proof valve 1111, and is used to collect the gas sprayed from the explosion-proof valve 1111. The exhaust inlet 121 and the exhaust outlet 123 are respectively connected to the exhaust channel 122. When the gas is sprayed from the explosion-proof valve 1111, the gas enters the exhaust channel 122 through the exhaust inlet 121, and then is discharged from the battery module 11 through the exhaust outlet 123.

[0027] To this end, when the battery module 11 has thermal runaway, gas is ejected from the explosion-proof valve 1111. Since an exhaust device 12 is provided on the battery module body 11, the gas enters the exhaust channel 122 through the exhaust inlet 121 after being ejected, and then is discharged from the battery module 11 through the exhaust outlet 123. The gas will not accumulate in the battery module 11 and be difficult to discharge. This solves the problem that when the battery module has thermal runaway, gas ejected from the explosion-proof valve accumulates in the module and is difficult to discharge, which can easily cause an explosion.

[0028] In this embodiment, the exhaust device 12 includes an upper shell 13 and a lower shell 14, the lower shell 14 is arranged on the lower side of the upper shell 13, an exhaust channel 122 is formed between the upper shell 13 and the lower shell 14, the exhaust inlet 121 is arranged on the lower side wall of the lower shell 14, and the exhaust outlet 123 is arranged on the upper side wall of the upper shell 13, the battery module body 11 includes a plurality of battery cell isolation sleeves 112, the plurality of battery cell isolation sleeves 112 are arranged between every two battery cell modules 111 in the plurality of battery cell modules 111, the lower shell 14 is arranged in the plurality of battery cell isolation sleeves 112, the lower side wall of the lower shell 14 is attached to the plurality of battery cell modules 111, and each explosion-proof valve 1111 is located in the corresponding exhaust inlet 121. Since the upper shell 13 and the lower shell 14 are a shell structure, when the upper shell 13 and the lower shell 14 are installed together, the interior is an inner cavity structure, therefore, an exhaust channel 122 can be formed, one explosion-proof valve 1111 corresponds to one exhaust inlet 121, and the lower side wall of the lower shell 14 is tightly fitted to the battery cell module 111, having a sealing effect, so that the gas ejected from the explosion-proof valve 1111 can only enter the exhaust channel 122 through the exhaust inlet 121.

[0029] like Figure 3As shown, in this embodiment, the lower side wall of the upper shell 13 is provided with a groove ring 151, and the upper side wall of the lower shell 14 is provided with a raised ring 152 matched with the groove ring 151, or, the lower side wall of the upper shell 13 is provided with a raised ring 152, and the upper side wall of the lower shell 14 is provided with a groove ring 151 with a raised ring 152 matched with the raised ring 152, the groove ring 151 is provided with a high-temperature glue layer 153, the raised ring 152 is inserted into the groove ring 151, and the groove ring 151 is bonded to the raised ring 152 through the high-temperature glue layer 153. The upper shell 13 and the lower shell 14 are connected together through the groove ring 151 and the raised ring 152. If the groove ring 151 is set on the upper shell 13, the raised ring 152 is set on the lower shell 14 accordingly, and if the groove ring 151 is set on the lower shell 14, the raised ring 152 is set on the upper shell 13 accordingly. In order to make the connection between the upper shell 13 and the lower shell 14 more secure, high temperature glue is applied to the groove ring 151 to form a high temperature glue layer 153 for bonding the raised ring 152 .

[0030] In this embodiment, the battery module 11 further includes a sealing structure 16, which is disposed between the lower side wall of the lower shell 14 and the plurality of battery modules 111. The sealing structure 16 is used to increase the sealing effect between the lower side wall of the lower shell 14 and the battery module 111, so that the gas ejected from the explosion-proof valve 1111 can only enter the exhaust channel 122 through the exhaust inlet 121.

[0031] In this embodiment, the sealing structure 16 includes a sealing foam layer 161, the upper side wall of the sealing foam layer 161 is provided with a first high temperature tape layer 162, the lower side wall of the sealing foam layer 161 is provided with a second high temperature tape layer 163, the sealing foam layer 161, the first high temperature tape layer 162 and the second high temperature tape layer 163 are provided with first through holes 164 at corresponding positions of each exhaust inlet 121, the first high temperature tape layer 162 is bonded to the lower side wall of the lower shell 14, and the second high temperature tape layer 163 is bonded to a plurality of battery modules 111. The sealing foam layer 161 can be compressed and has the performance of sealing gas, the first high temperature tape layer 162 is bonded to the lower side wall of the lower shell 14 and the sealing foam layer 161, the second high temperature tape layer 163 is bonded to the sealing foam layer 161 and the battery module 111, and the first high temperature tape layer 162 and the first high temperature tape layer 162 have not only bonding functions, but also sealing functions. The opening of the first through hole 164 is 1 mm to 3 mm larger than the outer contour of the explosion-proof valve 1111. Specifically, the sealing foam layer can be a foamed silicone foam layer.

[0032] In this embodiment, the exhaust device 12 further includes an exhaust pipe 124. The upper side wall of the upper shell 13 is provided with a mounting hole 132. The exhaust pipe 124 is inserted into the mounting hole 132, which is provided on the upper side wall of the upper shell 13 and exposed to the battery module body 11. The exhaust pipe 124 is connected to the exhaust channel 122, and the exhaust outlet 123 is the pipe opening at the upper end of the exhaust pipe 124. The exhaust pipe 124 and the upper shell 13 may be connected by laser welding, high-temperature glue bonding, or die-casting integral molding.

[0033] In the present embodiment, the exhaust device 12 also includes a plurality of groups of mounting plates 131, each of which is provided with a first mounting hole 1311, and each group of mounting plates 131 consists of two mounting plates 131, which are respectively provided on the two side walls of the upper shell 13 and correspond to the position of a battery cell isolation sleeve 112, and each group of mounting plates 131 corresponds to a group of first mounting holes 1311, a group of first mounting holes 1311 are round holes, and the remaining groups of first mounting holes 1311 are waist-shaped holes, and each battery cell isolation sleeve 112 is provided with a group of second mounting holes 1121 corresponding to a group of first mounting holes 1311, and the upper shell 13 is connected to the battery cell isolation sleeve 112 by passing the first mounting holes 1311 through the screws 125 to connect with the second mounting holes 1121. The upper shell 13 is connected to the cell isolation sleeve 112 through the first mounting hole 1311 of the upper shell 13 and the second mounting hole 1121 on the cell isolation sleeve 112 by screws 125, that is, the exhaust device 12 is installed on the cell isolation sleeve 112. The middle group of the multiple groups of first mounting holes 1311 is a round hole, which is used for accurate positioning of the screws 125 during the installation process, and the other multiple groups are waist-shaped holes, which are used to absorb tolerances during the installation process. Among them, the remaining groups of first mounting holes 1311 are the remaining groups except for the group of first mounting holes 1311.

[0034] The exhaust pipe 124 and the upper shell 13 are both made of metal, which can be aluminum, iron or tin, etc. The lower shell 14 is made of high-temperature plastic material, which can be made of one of PI (polyimide), PBI (polybenzimidazole), PEEK (polyetheretherketone) and LCP (liquid crystal polymer).

[0035] like Figure 4As shown, in some embodiments, the exhaust device 12 also includes two groups of mounting plates 131, each mounting plate 131 is provided with a first mounting hole 1311, each group of mounting plates 131 includes two mounting plates 131, which are respectively arranged on the two side walls of the upper shell 13 and correspond to the position of a battery cell isolation sleeve 112, each group of mounting plates 131 corresponds to a group of first mounting holes 1311, one group of first mounting holes 1311 is a round hole, and the other group of first mounting holes 1311 is a waist-shaped hole, two battery cell isolation sleeves 112 among the multiple battery cell isolation sleeves 112 are respectively provided with a group of second mounting holes 1121 corresponding to the group of first mounting holes 1311, and the upper shell 13 is connected to the battery cell isolation sleeve 112 by passing the first mounting holes 1311 and the second mounting holes 1121 through the screws 125, and the remaining battery cell isolation sleeves 112 among the multiple battery cell isolation sleeves 112 are respectively provided with a group of snap structures 126, and each group of snap structures 126 are respectively snapped on both sides of the upper side wall of the upper shell 13. A group of buckle structures 126 is two buckle structures 126. Not only threaded connection but also buckle connection is adopted, so that the connection is kept fixed and the user is convenient to operate. This solution reduces the number of screws 125 and ensures good air tightness of the exhaust device 12 at the same time.

[0036] like Figure 5 As shown, in some embodiments, each of the multiple battery cell isolation sleeves 112 is provided with a group of snap structures 126, and each group of snap structures 126 is respectively snapped on both sides of the upper side wall of the upper shell 13. A group of snap structures 126 is two snap structures 126. The snap connection is adopted to keep the connection fixed and make it convenient for users to operate. The snap structure 126 buckles the exhaust device 12 to ensure the overall air tightness and reliability. The lower side wall of the lower shell 14 is provided with a frame 141 surrounding each exhaust inlet 121, and the side wall of the frame 141 is provided with a plurality of first groove rings 1411. The first groove ring 1411 increases the creepage distance between the upper shell 13 and the battery module 111. A first high temperature glue layer 1412 is provided on the lower side wall of the frame 141 , the upper side wall of the first high temperature glue layer 1412 is bonded to the lower side wall of the frame 141 , and the lower side wall of the first high temperature glue layer 1412 is bonded to the plurality of battery modules 111 .

[0037] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery module, characterized in that: The invention comprises a battery module body and an exhaust device arranged on the battery module body, wherein the battery module body comprises a plurality of battery cell modules, the exhaust device is provided with an exhaust inlet corresponding to an explosion-proof valve of each of the plurality of battery cell modules, the exhaust device is further provided with an exhaust outlet and an exhaust channel, the exhaust inlet and the exhaust outlet are respectively connected with the exhaust channel, when the gas is ejected from the explosion-proof valve, the gas enters the exhaust channel through the exhaust inlet, and then is discharged from the battery module through the exhaust outlet; The exhaust device comprises an upper shell and a lower shell, the lower shell is arranged at the lower side of the upper shell, the exhaust passage is formed between the upper shell and the lower shell, the exhaust inlet is arranged at the lower side wall of the lower shell, and the exhaust outlet is arranged at the upper side wall of the upper shell; The lower side wall of the upper shell is provided with a groove ring, and the upper side wall of the lower shell is provided with a raised ring matched with the groove ring; The lower side wall of the lower shell is provided with a frame body surrounding each of the exhaust inlets, and the side wall of the frame body is provided with a plurality of first groove rings; The battery module also includes a sealing structure, which is arranged between the lower side wall of the lower shell and the multiple battery core modules, and the sealing structure includes a sealing foam layer, the upper side wall of the sealing foam layer is provided with a first high-temperature tape layer, and the lower side wall of the sealing foam layer is provided with a second high-temperature tape layer, and the sealing foam layer, the first high-temperature tape layer and the second high-temperature tape layer are provided with first through holes at positions corresponding to each exhaust inlet, the first high-temperature tape layer is bonded to the lower side wall of the lower shell, and the second high-temperature tape layer is bonded to the multiple battery core modules; The upper shell is made of metal, and the lower shell is made of high-temperature plastic material.

2. The battery module according to claim 1, characterized in that: The battery module body includes a plurality of battery cell isolation sleeves, wherein the plurality of battery cell isolation sleeves are arranged between every two battery cell modules among the plurality of battery cell modules, the lower shell is arranged on the plurality of battery cell isolation sleeves, the lower side wall of the lower shell is attached to the plurality of battery cell modules, and each explosion-proof valve is located in the corresponding exhaust inlet.

3. The battery module according to claim 1, characterized in that: The lower side wall of the upper shell is provided with a raised ring, the upper side wall of the lower shell is provided with a raised ring groove ring matching with the raised ring, the groove ring is provided with a high-temperature glue layer, the raised ring is inserted into the groove ring, and the groove ring is bonded to the raised ring through the high-temperature glue layer.

4. The battery module according to any one of claims 1 to 3, characterized in that: The exhaust device also includes an exhaust pipe. The upper side wall of the upper shell is provided with a mounting hole. The exhaust pipe is inserted into the mounting hole provided on the upper side wall of the upper shell and exposed to the battery module body. The exhaust pipe is connected to the exhaust channel, and the exhaust outlet is the pipe opening at the upper end of the exhaust pipe.

5. The battery module according to any one of claims 1 to 3, characterized in that: The exhaust device also includes multiple groups of mounting plates, each of which is provided with a first mounting hole. Each group of mounting plates consists of two mounting plates, which are respectively provided on the two side walls of the upper shell and correspond to the position of a battery cell isolation sleeve. Each group of mounting plates corresponds to a group of first mounting holes, one group of first mounting holes is a round hole, and the remaining groups of first mounting holes are waist-shaped holes. Each battery cell isolation sleeve is provided with a group of second mounting holes corresponding to the group of first mounting holes. The upper shell is connected to the battery cell isolation sleeve by screws passing through the first mounting holes and connecting with the second mounting holes.

6. The battery module according to any one of claims 1 to 3, characterized in that: The exhaust device also includes two groups of mounting plates, each of which is provided with a first mounting hole. Each group of mounting plates consists of two mounting plates, which are respectively provided on the two side walls of the upper shell and correspond to the position of a battery cell isolation sleeve. Each group of mounting plates corresponds to a group of first mounting holes, one group of first mounting holes is a round hole, and the other group of first mounting holes is a waist-shaped hole. Two of the multiple battery cell isolation sleeves are respectively provided with a group of second mounting holes corresponding to the group of first mounting holes. The upper shell is connected to the battery cell isolation sleeve by screws passing through the first mounting holes and connecting with the second mounting holes. The remaining battery cell isolation sleeves of the multiple battery cell isolation sleeves are respectively provided with a group of snap-fit ​​structures, and each group of snap-fit ​​structures respectively snaps on the two sides of the upper side wall of the upper shell.

7. The battery module according to claim 2, characterized in that: Each of the plurality of battery cell isolation sleeves is provided with a group of buckle structures, and each group of buckle structures is buckled with two sides of the upper side wall of the upper shell respectively.

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