Battery module and battery pack

Abstract

A battery module and a battery pack. The battery module comprises: a battery group (1), wherein the battery group (1) comprises a plurality of battery cells (11), and one end of each battery cell (11) in a first direction is provided with an electrode pole (12) and an explosion-proof valve (13); and a protective plate assembly (2), wherein the protective plate assembly (2) is provided on the sides of the battery cells (11) provided with the electrode poles (12) in the first direction, and has mounting gaps (24) and communicating holes (25) which are spaced apart from each other, and the communicating holes (25) are opposite to the explosion-proof valves (13) in the first direction.

Description

Battery module and battery pack

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese Patent Application No. 202421250868.2, filed on June 3, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to, but is not limited to, the technical field of battery pack, and particularly relates to a battery module and a battery pack. BACKGROUND

[0004] In the prior art, when thermal runaway occurs, the substances sprayed from the battery cell may be attached to the conductive sheet from the side of the conductive sheet, directly above the conductive sheet, or below the conductive sheet under high temperature and high pressure. At the same time, the ceramic composite tape, mica paper and other protective plate assemblies commonly used will be separated from the conductive sheet under the high pressure airflow generated during thermal runaway, losing the protective effect, thereby causing a short circuit between the conductive sheet and the top cover of the battery cell, and the safety is not high. SUMMARY

[0005] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims. The present application proposes a battery module which reduces the damage of hot gas and part of impurities to the protective plate assembly, and can avoid the diffusion of hot gas and part of impurities towards the mounting gap to affect the conductive sheet, thereby improving the safety of the battery cell.

[0006] The present application also proposes a battery pack comprising the above-mentioned battery module.

[0007] The battery module according to the embodiments of the present application comprises: a battery pack comprising a plurality of battery cells, one end of the battery cell in a first direction having a pole and an explosion-proof valve; a protective plate assembly provided on the side of the battery cell having the pole in the first direction, the protective plate assembly having a spaced mounting gap and a communication hole, the communication hole being arranged opposite to the explosion-proof valve in the first direction.

[0008] According to the battery module of the embodiments of the present application, by arranging the spaced mounting gap and the communication hole on the protective plate assembly, and the communication hole being opposite to the explosion-proof valve in the first direction. When the battery cell occurs thermal runaway, the hot gas and part of impurities flowing out of the explosion-proof valve can be discharged through the communication hole, avoiding the hot gas and part of impurities sprayed from the explosion-proof valve to spread in any direction, reducing the damage of the hot gas and part of impurities to the protective plate assembly, and avoiding the diffusion of the hot gas and part of impurities towards the mounting gap to affect the structure such as the conductive sheet, thereby avoiding the short circuit of the conductive sheet, and improving the safety of the battery cell.

[0009] In some embodiments of the application, the protective plate assembly comprises a first isolation plate and a second isolation plate arranged in a stack, the first isolation plate is located on a side of the second isolation plate away from the battery cell, and the mounting gap is defined between the first isolation plate and the second isolation plate. The communication hole comprises a first through hole and a second through hole which are in communication with each other in the first direction. The first through hole is provided on the first isolation plate, and the second through hole is provided on the second isolation plate.

[0010] In some embodiments of the application, the first isolation plate is provided with a protruding portion protruding in a direction away from the second isolation plate. The mounting gap is formed between the protruding portion and the second isolation plate.

[0011] In some embodiments of the application, the protruding portion is a plurality of spaced-apart protruding portions. A groove is formed between two adjacent protruding portions. The first through hole is provided on the bottom wall of the groove. The groove is spaced apart from the mounting gap.

[0012] In some embodiments of the application, the first isolation plate is provided with a first positioning hole, and the second isolation plate is provided with a first positioning pin matched with the first positioning hole. Alternatively, the first isolation plate is provided with a first positioning pin, and the second isolation plate is provided with a first positioning hole matched with the first positioning pin.

[0013] In some embodiments of the application, the protective plate assembly further comprises an explosion-proof plate provided in the first through hole for plugging the first through hole.

[0014] In some embodiments of the application, the protective plate assembly further comprises a third isolation plate embedded on a side of the second isolation plate away from the first isolation plate. The communication hole further comprises a third through hole provided on the third isolation plate.

[0015] In some embodiments of the application, a side of the third isolation plate facing the second isolation plate is provided with an annular protrusion surrounding the third through hole. The annular protrusion is provided in the second through hole. An exhaust passage is formed in the annular protrusion. One end of the exhaust passage is in communication with the third through hole, and the other end of the exhaust passage is in communication with the first through hole.

[0016] In some embodiments of the application, the third isolation plate and the second isolation plate are an integral piece. Alternatively, the second isolation plate is provided with a second positioning hole, and the third isolation plate is provided with a second positioning pin matched with the second positioning hole. Alternatively, the second isolation plate is provided with a second positioning pin, and the third isolation plate is provided with a second positioning hole matched with the second positioning pin.

[0017] The battery pack according to the embodiments of the present application comprises the battery module.

[0018] The battery pack according to the embodiments of the present application comprises the battery module.

[0019] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0021] Fig. 1 is an exploded view of a battery module according to an embodiment of the present application;

[0022] Fig. 2 is an enlarged view of A in Fig. 1;

[0023] Fig. 3 is an enlarged view of B in Fig. 1;

[0024] Fig. 4 is an enlarged view of C in Fig. 1;

[0025] Fig. 5 is an enlarged view of D in Fig. 1;

[0026] Fig. 6 is a perspective view of an internal structure of a battery pack according to an embodiment of the present application, in which the protective plate assembly is a perspective view;

[0027] Fig. 7 is an enlarged view of E in Fig. 6.

[0028] Reference numerals: 100, Battery pack; 10, Battery module; 1, Battery group; 11, Cell; 12, Terminal post; 13, Explosion-proof valve; 2, Protective plate assembly; 21, First isolation plate; 211, Protrusion; 212, First positioning hole; 213, Groove; 22, Second isolation plate; 221, First positioning pin; 222, Second positioning hole; 23, Third isolation plate; 231, Annular protrusion; 232, Second positioning pin; 233, Exhaust channel; 24, Installation gap; 25, Connecting hole; 251, First through hole; 252, Second through hole; 253, Third through hole; 26, Through hole; 27, Explosion-proof plate; 3, Conductive sheet; 4, Pressure strip; 41, Main body; 42, Side protrusion; 5, Low-voltage acquisition board. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The battery module 10 according to an embodiment of the present application is described below with reference to Figures 1-7.

[0033] As shown in FIG. 1-7, the battery module 10 according to the embodiments of the present application comprises: a battery pack 1, a protection plate assembly 2 and a conductive sheet 3.

[0034] Specifically, referring to FIG. 1-7, the battery pack 1 comprises a plurality of battery cells 11, wherein, for example, in the present application, the plurality of battery cells 11 are arranged along a third direction (the c direction shown in FIG. 1), one end of the battery cell 11 along a first direction (the a direction shown in FIG. 1) has a pole 12 and an explosion-proof valve 13, the first direction and the third direction are perpendicular; the protection plate assembly 2 is arranged on the side of the battery cell 11 having the pole 12 along the first direction, the protection plate assembly 2 has a mounting gap 24 and a communication hole 25 spaced apart, the communication hole 25 is opposite to the explosion-proof valve 13 in the first direction. The mounting gap 24 extends along the third direction, and the protection plate assembly 2 has a through hole 26 for the pole 12 to pass through; the conductive sheet 3 is arranged in the mounting gap 24, the conductive sheet 3 is a plurality of, the plurality of conductive sheets 3 are used to connect the poles 12 of two adjacent battery cells 11, the through hole 26 and the pole 12 are arranged opposite in the first direction and communicate with the mounting gap 24.

[0035] It should be noted that the pole 12 comprises a positive pole 12 and a negative pole 12, each battery cell 11 has one positive pole 12 and one negative pole 12, one end of each conductive sheet 3 is connected to the positive pole 12 of one battery cell 11, and the other end is connected to the negative pole 12 of the adjacent other battery cell 11; and the through hole 26 is provided to facilitate the connection of the pole 12 and the conductive sheet 3, wherein the pole 12 is a plurality of, and the through hole 26 is also a plurality of one-to-one corresponding, so that the plurality of battery cells 11 can be connected in series, thereby improving the overall voltage of the battery pack 1 and the electrical energy of the battery pack 1. At the same time, the conductive sheet 3 and the pole 12 are connected by welding, and when the conductive sheet 3 and the pole 12 are welded, the conductive sheet 3 can effectively press the protection plate assembly 2, so that the protection plate assembly 2 is tightly attached to the battery cell 11, thereby improving the installation reliability of the conductive sheet 3 and the protection plate assembly 2.

[0036] The arrangement of the explosion-proof valve 13 allows hot gas and some impurities to flow out from the explosion-proof valve 13 when thermal runaway occurs inside the battery cell 11, thereby avoiding excessive pressure inside the battery cell 11 and explosion, thereby improving safety.

[0037] It can be understood that, since the communication hole 25 is opposite to the explosion-proof valve 13 in the first direction, when the battery cell 11 is in thermal runaway, the hot gas and part of the impurities flowing out from the explosion-proof valve 13 can flow to the outside through the communication hole 25, so that the hot gas and part of the impurities can be prevented from being sprayed from the explosion-proof valve 13 and spreading in any direction, and directional overflow of the hot gas and part of the impurities to the outside is realized. Thus, the damage of the hot gas and part of the impurities to the protective plate assembly 2 is reduced, and the influence of the hot gas and part of the impurities on the connection between the protective plate assembly 2 and the battery cell 11 is also reduced, so that the protective plate assembly 2 is more stable, and the protection effect of the protective plate assembly 2 is improved.

[0038] Meanwhile, since the conductive sheet 3 is arranged in the mounting gap 24, the mounting gap 24 and the communication hole 25 are spaced apart, so that the hot gas and part of the impurities can be prevented from diffusing towards the mounting gap 24 and affecting the conductive sheet 3, thereby avoiding the attachment of impurities at the conductive sheet 3 and the detachment of the protective plate assembly 2 at the conductive sheet 3, and avoiding the short circuit of the conductive sheet 3, so that the safety of the battery cell 11 is improved.

[0039] The conductive sheet 3 can be a copper bar, an aluminum bar, etc., so as to realize the connection of the circuit.

[0040] According to the battery module 10 of the embodiments of the present application, the mounting gap 24 and the communication hole 25 are arranged on the protective plate assembly 2 and are spaced apart, and the communication hole 25 is opposite to the explosion-proof valve 13 in the first direction. Thus, when the battery cell 11 is in thermal runaway, the hot gas and part of the impurities flowing out from the explosion-proof valve 13 can be discharged through the communication hole 25, the hot gas and part of the impurities can be prevented from being sprayed from the explosion-proof valve 13 and spreading in any direction, the damage of the hot gas and part of the impurities to the protective plate assembly 2 is reduced, and the hot gas and part of the impurities can be prevented from diffusing towards the mounting gap 24 and affecting the conductive sheet 3 and other structures, so that the short circuit of the conductive sheet 3 is avoided, and the safety of the battery cell 11 is improved.

[0041] In some embodiments of the present application, as shown in FIGS. 1-5 and 7, the protective plate assembly 2 includes a first isolation plate 21 and a second isolation plate 22 arranged in layers, the first isolation plate 21 is located on a side of the second isolation plate 22 away from the battery cell 11, and the mounting gap 24 is defined between the first isolation plate 21 and the second isolation plate 22. The communication hole 25 includes a first through hole 251 and a second through hole 252 which are in communication with each other in the first direction, the first through hole 251 is arranged on the first isolation plate 21, and the second through hole 252 is arranged on the second isolation plate 22.

[0042] It can be understood that the mounting gap 24 is defined between the first isolation plate 21 and the second isolation plate 22, and the conductive sheet 3 is arranged in the mounting gap 24, so that the first isolation plate 21 and the second isolation plate 22 can form protection for the conductive sheet 3, wherein the second isolation plate 22 has a through hole 26 for the pole 12 to pass through, thereby facilitating the connection of the pole 12 and the conductive sheet 3. The first through hole 251 penetrates the first isolation plate 21, and the second through hole 252 penetrates the second isolation plate 22, and the first through hole 251 and the second through hole 252 are communicated, thereby facilitating the outflow of the hot gas and the impurities from the first through hole 251 and the second through hole 252.

[0043] At the same time, it can also further avoid the hot gas and part of the impurities from being sprayed out of the explosion-proof valve 13 and spreading in any direction, thereby reducing the damage of the hot gas and part of the impurities to the protective plate assembly 2, and also reducing the influence of the hot gas and part of the impurities on the connection between the protective plate assembly 2 and the battery cell 11, thereby making the protective plate assembly 2 more stable, thereby improving the protection effect of the protective plate assembly 2.

[0044] In some embodiments of the present application, the first isolation plate 21 and the second isolation plate 22 can be connected by hot riveting, bonding, clamping and the like. Thus, the connection reliability of the first isolation plate 21 and the second isolation plate 22 is improved.

[0045] In some embodiments of the present application, as shown in FIGS. 1, 5 and 7, the first isolation plate 21 is provided with a protruding portion 211 protruding away from the second isolation plate 22, and the mounting gap 24 is formed between the protruding portion 211 and the second isolation plate 22. It can be understood that by arranging the protruding portion 211, the mounting gap 24 of the present application is facilitated, thereby facilitating the installation of the conductive sheet 3 and the like.

[0046] In some embodiments of the present application, as shown in FIGS. 1, 5 and 7, the protruding portion 211 is a plurality of spaced-apart protruding portions, and a groove 213 is formed between two adjacent protruding portions 211, the first through hole 251 is arranged on the bottom wall of the groove 213, and the groove 213 and the mounting gap 24 are spaced apart.

[0047] For example, in the present application, the protruding portion 211 is two spaced-apart protruding portions in the second direction, but the present application is not limited thereto, and the protruding portion 211 can also be more, for example, 3, 4, 5 or 6, etc.

[0048] It can be understood that when the battery cell 11 occurs thermal runaway, the hot gas and part of the impurities are discharged from the explosion-proof valve 13 to the second through hole 252, and then to the first through hole 251. After being discharged from the first through hole 251, the hot gas and part of the impurities enter the groove 213. At this time, the two side walls of the groove 213 in the width direction can block the hot gas and part of the impurities, so that the hot gas and part of the impurities can be discharged from the notch of the groove 213 to the outside, realizing the directional overflow of the hot gas and part of the impurities. Thus, the hot gas and part of the impurities are further prevented from being sprayed from the explosion-proof valve 13 and spreading in any direction, thereby reducing the damage of the hot gas and part of the impurities to the protective plate assembly 2, and reducing the influence of the hot gas and part of the impurities on the connection between the protective plate assembly 2 and the battery cell 11, so that the protective plate assembly 2 is more stable, thereby improving the protection effect of the protective plate assembly 2.

[0049] Meanwhile, since the groove 213 and the mounting gap 24 are spaced apart, the two side walls of the groove 213 in the width direction can block the hot gas and part of the impurities from diffusing towards the mounting gap 24 and affecting the conductive sheet 3, further preventing the impurities from adhering to the conductive sheet 3, and also preventing the protective plate assembly 2 from falling off at the conductive sheet 3 to cause failure, thereby avoiding the short circuit of the conductive sheet 3 and improving the safety of the battery cell 11.

[0050] In some embodiments of the present application, as shown in FIGS. 1, 4 and 5, the first isolation plate 21 is provided with a first positioning hole 212, and the second isolation plate 22 is provided with a first positioning pin 221 matched with the first positioning hole 212, or the first isolation plate 21 is provided with the first positioning pin 221, and the second isolation plate 22 is provided with the first positioning hole 212 matched with the first positioning pin 221. For example, in the present application, the first positioning hole 212 is provided on the first isolation plate 21, and the first positioning pin 221 is provided on the second isolation plate 22.

[0051] It can be understood that the mutual cooperation of the first positioning hole 212 and the first positioning pin 221 improves the connection reliability of the first isolation plate 21 and the second isolation plate 22, and at the same time, the mutual cooperation of the first positioning hole 212 and the first positioning pin 221 improves the connection portability of the first isolation plate 21 and the second isolation plate 22, thereby facilitating the subsequent installation and connection of the first isolation plate 21 and the second isolation plate 22 and improving the installation efficiency.

[0052] In some embodiments of the present application, as shown in FIGS. 1, 4 and 5, the first positioning hole 212 is a plurality of rows spaced apart along a second direction (for example, the b direction shown in FIG. 1), and each row of first positioning holes 212 includes a plurality of first positioning holes 212 spaced apart along a third direction. The first positioning pin is a plurality of first positioning pins corresponding one-to-one to the first positioning holes 212. Thus, the connection reliability of the first isolation plate 21 and the second isolation plate 22 is further improved. The first direction, the second direction and the third direction are perpendicular to each other.

[0053] In some embodiments of the present application, as shown in FIGS. 1 and 5, the explosion-proof plate 27 is arranged in the first through hole 251 to block the first through hole 251, thereby improving the sealing performance.

[0054] In some embodiments of the present application, the thickness of the explosion-proof plate 27 in the first direction is smaller than the thickness of the first isolation plate 21. It can be understood that when thermal runaway occurs, since the thickness of the explosion-proof plate 27 in the first direction is smaller than the thickness of the first isolation plate 21, the hot gas is facilitated to flow out of the first through hole 251 by breaking through the explosion-proof plate 27, so that the first through hole 251 plays a role of guiding, thereby further facilitating the hot gas and part of the impurities flowing out of the explosion-proof valve 13 to be sprayed outwards, so that the hot gas and part of the impurities can be prevented from being dispersed in any direction after being sprayed out of the explosion-proof valve 13, thereby reducing the damage of the hot gas and part of the impurities to the protection plate assembly 2 and reducing the influence of the hot gas and part of the impurities on the connection between the protection plate assembly 2 and the battery cell 11, so that the protection plate assembly 2 is more stable, thereby improving the protection effect of the protection plate assembly 2.

[0055] In some embodiments of the present application, as shown in FIGS. 1 and 3, the protection plate assembly 2 further comprises a third isolation plate 23, the third isolation plate 23 is embedded on the side of the second isolation plate 22 away from the first isolation plate 21, the through hole 25 further comprises a third through hole 253, the third through hole 253 is arranged on the third isolation plate 23, and the arrangement of the first isolation plate 21, the second isolation plate 22 and the third isolation plate 23 can make the structure of the protection plate assembly 2 have higher strength and be more stable, thereby improving the protection reliability of the protection plate assembly 2.

[0056] In some embodiments of the present application, as shown in FIGS. 1 and 2-5, part of the first isolation plate 21 is protruded in the direction away from the second isolation plate 22 to form a protruding portion 211, and in the first direction, the third isolation plate 23 is arranged opposite to the protruding portion 211, thereby facilitating the mutual communication of the first through hole 251, the second through hole 252 and the third through hole 253.

[0057] In some embodiments of the present application, as shown in FIGS. 1, 3 and 4, the side of the third isolation plate 23 facing the first isolation plate 21 is provided with an annular protrusion 231, the annular protrusion 231 is arranged around the third through hole 253, the annular protrusion 231 is arranged in the second through hole 252, and an exhaust passage 233 is formed in the annular protrusion 231, one end of the exhaust passage 233 communicates with the third through hole 253, and the other end communicates with the first through hole 251. It can be understood that when the battery cell 11 occurs thermal runaway, the gas flows from the explosion-proof valve 13 to the third through hole 253, then enters the exhaust passage 233, and then flows out of the first through hole 251 to the outside.

[0058] Therefore, the arrangement of the annular protrusion 231 facilitates the flow of the hot gas in thermal runaway from the third through hole 253 to the first through hole 251, thereby further avoiding the hot gas and part of the impurities from being sprayed out of the explosion-proof valve 13 and spreading in any direction at the second through hole 252, and also avoiding the hot gas and part of the impurities from spreading toward the mounting gap 24 to affect the conductive sheet 3, thereby avoiding the attachment of impurities on the conductive sheet 3 and the detachment of the protective plate assembly 2 on the conductive sheet 3, and further avoiding the short circuit of the conductive sheet 3, thereby improving the safety of the battery cell 11.

[0059] In some embodiments of the present application, as shown in FIGS. 1, 3 and 4, one end of the annular protrusion 231 away from the third isolation plate 23 is flush with one end of the second through hole 252 away from the third isolation plate 23, thereby avoiding the installation interference between the annular protrusion 231 and the first isolation plate 21.

[0060] In some embodiments of the present application, the third isolation plate 23 and the second isolation plate 22 are an integral piece, thereby improving the integrity of the third isolation plate 23 and the second isolation plate 22, and further improving the sealing between the third isolation plate 23 and the second isolation plate 22, thereby avoiding the hot gas and part of the impurities from spreading toward the mounting gap 24 to affect the conductive sheet 3, further avoiding the attachment of impurities on the conductive sheet 3, and avoiding the detachment of the protective plate assembly 2 on the conductive sheet 3, thereby avoiding the short circuit of the conductive sheet 3, and making the protective plate assembly 2 more stable and reliable, and further improving the protection effect of the protective plate assembly 2.

[0061] In some embodiments of the present application, as shown in FIGS. 1, 3 and 4, the second isolation plate 22 is provided with a second positioning hole 222, and the third isolation plate 23 is provided with a second positioning pin 232 matched with the second positioning hole 222, or the second isolation plate 22 is provided with the second positioning pin 232, and the third isolation plate 23 is provided with a second positioning hole 222 matched with the second positioning pin 232. For example, in the present application, the second isolation plate 22 is provided with the second positioning hole 222, and the third isolation plate 23 is provided with the second positioning pin 232 matched with the second positioning hole 222.

[0062] It can be understood that the mutual cooperation of the second positioning hole 222 and the second positioning pin 232 improves the connection reliability of the second isolation plate 22 and the third isolation plate 23, and further improves the connection portability of the second isolation plate 22 and the third isolation plate 23, thereby facilitating the subsequent installation and connection of the third isolation plate 23 and the second isolation plate 22, and improving the installation efficiency.

[0063] In some embodiments of the present application, as shown in FIG. 1, FIG. 3 and FIG. 4, the second positioning holes 222 are multiple rows spaced apart along the second direction, each row of the second positioning holes 222 includes multiple second positioning holes 222 spaced apart along the third direction, and the second positioning posts are multiple corresponding to the second positioning holes 222, thereby further improving the connection reliability of the third isolation plate 23 and the second isolation plate 22.

[0064] In addition, the third isolation plate 23 and the second isolation plate 22 can be connected by secondary injection molding, adhesive, hot melting, riveting, interference fit, ultrasonic welding and the like, thereby improving the connection reliability of the third isolation plate 23 and the second isolation plate 22.

[0065] In some embodiments of the present application, the first isolation plate 21 is a mica plate; it can be understood that the mica plate has good insulation and heat resistance, and thus the first isolation plate 21 is a mica plate, which can reduce the occurrence of electric leakage of the electric core 11 and the conductive sheet 3, and improve the safety. At the same time, it also reduces the melting of the first isolation plate 21 when thermal runaway occurs, thereby improving the structural reliability of the first isolation plate 21 and the protection reliability of the protection plate assembly 2.

[0066] In some embodiments of the present application, the second isolation plate 22 is a plastic plate; it can be understood that the plastic plate has good insulation and heat resistance, and thus the second isolation plate 22 is a plastic plate, which can reduce the occurrence of electric leakage of the electric core 11 and the conductive sheet 3, and avoid short circuit between the electric core 11 and the conductive sheet 3, thereby improving the safety. At the same time, it also reduces the melting of the second isolation plate 22 when thermal runaway occurs, thereby improving the structural reliability of the second isolation plate 22 and the protection reliability of the protection plate assembly 2.

[0067] In some embodiments of the present application, the third isolation plate 23 is a plastic plate. It can be understood that the plastic plate has good insulation and heat resistance, and thus the third isolation plate 23 is a plastic plate, which can reduce the occurrence of electric leakage of the electric core 11 and the conductive sheet 3, and avoid short circuit between the electric core 11 and the conductive sheet 3, thereby improving the safety. At the same time, it also reduces the melting of the third isolation plate 23 when thermal runaway occurs, thereby improving the structural reliability of the second isolation plate 22 and the protection reliability of the protection plate assembly 2.

[0068] In some embodiments of the present application, as shown in FIG. 1 and FIG. 2, the pole 12 is two spaced apart along the second direction, the explosion-proof valve 13 is located between the two poles 12, and the installation gap 24 is two, the two installation gaps 24 are respectively arranged opposite to the two poles 12 in the first direction.

[0069] It can be understood that, of the two pole columns 12, one is a positive pole column 12 and the other is a negative pole column 12, of the two adjacent battery cells 11, the positive pole column 12 of one battery cell 11 is arranged adjacent to the negative pole column 12 of the other battery cell 11 in the third direction, and the conductive sheet 3 connects the positive pole column 12 of one of the two adjacent battery cells 11 and the negative pole column 12 of the other battery cell 11, so as to realize the positive and negative connection of the two adjacent battery cells 11, thereby realizing the series connection of the two adjacent battery cells 11.

[0070] In some embodiments of the present application, as shown in FIGS. 1, 6 and 7, the battery module 10 further comprises a pressing strip 4, the pressing strip 4 and the protection plate assembly 2 are arranged at the same end of the battery cell 11, the pressing strip 4 is connected with the battery cell 11, and part of the pressing strip 4 is arranged on the side of the protection plate assembly 2 away from the battery cell 11 and abuts against the protection plate assembly 2. Wherein, the pressing strip 4 is an insulating piece.

[0071] Therefore, through the arrangement of the pressing strip 4, the pressing strip 4 can press the protection plate assembly 2, thereby improving the installation stability of the protection plate assembly 2 on the battery cell 11, further reducing the situation that the protection plate assembly 2 falls off, and improving the protection reliability of the protection plate assembly 2 to the conductive sheet 3 and the battery cell 11.

[0072] In some embodiments of the present application, as shown in FIGS. 1, 6 and 7, the pressing strip 4 comprises a main body part 41 and a side part protrusion 42 arranged on both sides of the main body part 41 along the second direction, the main body part 41 is connected with the battery cell 11, the side part protrusion 42 close to the protection plate assembly 2 abuts against the side of the protection plate assembly 2 away from the battery cell 11, and the first direction, the second direction and the third direction are perpendicular to each other.

[0073] Wherein, it should be noted that the main body part 41 and the battery cell 11 can be connected by bonding and / or fastener connection and the like, thereby improving the connection reliability between the pressing strip 4 and the battery cell 11, further enabling the pressing strip 4 to press the protection plate assembly 2, thereby improving the installation stability of the protection plate assembly 2 on the battery cell 11, further reducing the situation that the protection plate assembly 2 falls off, and improving the protection reliability of the protection plate assembly 2 to the conductive sheet 3 and the battery cell 11.

[0074] It can be understood that the side part protrusion 42 abuts against the side of the protection plate assembly 2 away from the battery cell 11, thereby facilitating the pressing of the protection plate assembly 2, thereby limiting the movement of the protection plate assembly 2 towards the direction away from the battery cell 11, reducing the situation that the protection plate assembly 2 falls off, and improving the protection reliability of the protection plate assembly 2 to the conductive sheet 3 and the battery cell 11.

[0075] In some embodiments of the present application, as shown in FIG. 1, FIG. 6 and FIG. 7, the battery module 10 further comprises a low-voltage acquisition board 5, the low-voltage acquisition board 5 is arranged in the mounting gap 24, and the low-voltage acquisition board 5 is arranged on the side of the conductive sheet 3 away from the battery cell 11 and connected with the conductive sheet 3.

[0076] It can be understood that the low-voltage acquisition board 5 is used to acquire the temperature and voltage in each component of the battery module 10, and the low-voltage acquisition board 5 is connected with the conductive sheet 3, so that the battery cell 11 can supply power for the low-voltage acquisition board 5. Since the low-voltage acquisition board 5 is located in the mounting gap 24, the mounting gap 24 is spaced apart from the communication hole 25, so that when thermal runaway occurs, the protection plate assembly 2 still has a good protection effect on the low-voltage acquisition circuit, and the voltage and temperature acquisition can still be performed on each component of the battery module 10 (except the thermal runaway area of the battery cell 11) after thermal runaway.

[0077] Next, the battery pack 100 according to the embodiments of the present application is described with reference to FIG. 6 and FIG. 7.

[0078] As shown in FIG. 6 and FIG. 7, the battery pack 100 according to the embodiments of the present application comprises the above-mentioned battery module 10.

[0079] Specifically, with reference to FIG. 1, FIG. 2, FIG. 6 and FIG. 7, the battery module 10 is a plurality of battery modules 10 connected with each other along the second direction, and the pressure strip 4 is arranged between the adjacent two battery modules 10. One side of the pressure strip 4 protrudes 42 and abuts against the side of the protection plate assembly 2 of one of the battery modules 10 away from the battery cell 11, and the other side of the pressure strip 4 protrudes 42 and abuts against the side of the protection plate assembly 2 of the other of the battery modules 10 away from the battery cell 11. Thus, the connection between the adjacent battery modules 10 can be reliable and stable. In addition, the main body 41 and the protection plate assembly 2 can play an insulating role for the adjacent battery modules 10, so as to avoid short circuit between the conductive sheets 3 in the adjacent battery modules 10, thereby avoiding short circuit between the adjacent battery modules 10.

[0080] According to the battery pack 100 of the embodiments of the present application, by arranging the above-mentioned battery module 10, the mounting gap 24 and the communication hole 25 spaced apart on the protection plate assembly 2, and the communication hole 25 is opposite to the explosion-proof valve 13 in the first direction. When the battery cell 11 occurs thermal runaway, the hot gas and part of the impurities flowing out of the explosion-proof valve 13 can be discharged through the communication hole 25, avoiding the hot gas and part of the impurities from being sprayed out of the explosion-proof valve 13 and spreading in any direction, reducing the damage of the hot gas and part of the impurities to the protection plate assembly 2, and avoiding the hot gas and part of the impurities from spreading to the mounting gap 24 and affecting the conductive sheet 3 and other structures, thereby avoiding the short circuit of the conductive sheet 3, and improving the safety of the battery cell 11.

[0081] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. It is emphasized that each of these terms refers to a specific feature, structure, material or characteristic described in connection with a particular embodiment or example. The descriptive terms are not necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0082] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application is defined with respect to the appended claims. Other aspects will become apparent from the following detailed description, taken in conjunction with the accompanying drawings and overally, when considered in conjunction with the accompanying drawings and detailed description, others will become apparent.

Claims

1. A battery module, comprising: a battery pack comprising a plurality of battery cells, one end of the battery cells in a first direction having a pole and an explosion-proof valve; a protection plate assembly provided on a side of the battery cells having the pole in the first direction, the protection plate assembly having a mounting gap and a communication hole spaced apart, the communication hole being provided opposite the explosion-proof valve in the first direction.

2. The battery module of claim 1, wherein, The protection plate assembly comprises a first isolation plate and a second isolation plate stacked, the first isolation plate being located on a side of the second isolation plate away from the battery cells, the mounting gap being defined between the first isolation plate and the second isolation plate, The communication hole comprises a first through hole and a second through hole communicating with each other in the first direction, the first through hole being provided on the first isolation plate, and the second through hole being provided on the second isolation plate.

3. The battery module of claim 2, wherein, The first isolation plate is provided with a protruding portion protruding away from the second isolation plate, and the mounting gap is formed between the protruding portion and the second isolation plate.

4. The battery module of claim 3, wherein, The protruding portion is a plurality of spaced-apart protruding portions, and a groove is formed between adjacent two protruding portions, the first through hole being provided on a bottom wall of the groove, and the groove being spaced apart from the mounting gap.

5. The battery module of claim 2, wherein, The first isolation plate is provided with a first positioning hole, and the second isolation plate is provided with a first positioning pin matched with the first positioning hole, Or, the first isolation plate is provided with a first positioning pin, and the second isolation plate is provided with a first positioning hole matched with the first positioning pin.

6. The battery module of claim 2, wherein, The protection plate assembly further comprises: an explosion-proof plate provided in the first through hole for plugging the first through hole.

7. The battery module of claim 2, wherein, The protection plate assembly further comprises a third isolation plate embedded on a side of the second isolation plate away from the first isolation plate, and the communication hole further comprises a third through hole provided on the third isolation plate.

8. The battery module of claim 7, wherein, A side of the third isolation plate facing the second isolation plate is provided with an annular protrusion surrounding the third through hole, the annular protrusion being provided in the second through hole, and an exhaust passage is formed in the annular protrusion, one end of the exhaust passage communicating with the third through hole and the other end communicating with the first through hole.

9. The battery module of claim 7, wherein, The third isolation plate and the second isolation plate are an integral piece, And / or, the second isolation plate is provided with a second positioning hole, and the third isolation plate is provided with a second positioning pin matched with the second positioning hole, or the second isolation plate is provided with a second positioning pin, and the third isolation plate is provided with a second positioning hole matched with the second positioning pin.

10. A battery pack comprising the battery module according to any one of claims 1-9.

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