WO2022142069A1

WO2022142069A1 - Assembly having anti-thermal runaway function and battery module

Info

Publication number: WO2022142069A1
Application number: PCT/CN2021/093838
Authority: WO
Inventors: 王佳; 杨秋立; 马姜浩; 张鹏
Original assignee: 江苏正力新能电池技术有限公司
Priority date: 2020-12-31
Filing date: 2021-05-14
Publication date: 2022-07-07
Also published as: CN214428739U

Abstract

An assembly having an anti-thermal runaway function and a battery module. The assembly having an anti-thermal runaway function comprises: a fireproof plate (1); and a harness plate (2), which is disposed below the fireproof plate (1). Several thin and weak parts (11) are disposed on the fireproof plate (1), and several through holes (20) are disposed on the harness plate (2). The thin and weak parts (11) and the through holes (20) all correspond to explosion-proof valves (31) of a battery (3). A first guard wall (111) is disposed in the thin and weak parts (11), and a second guard wall (201) is disposed in the through holes (20). The thin and weak parts (11) are broken under a specified condition, and the first guard wall (111) and the second guard wall (201) form a fireproof channel. The described assembly can form a fireproof wall channel, isolate high and low voltage components in a module from a high-temperature substance and a flame, and reduce the probability of thermal diffusion by a battery cell in the module.

Description

A thermal runaway-proof component and battery module

This application claims the priority of the Chinese patent application filed on December 31, 2020 with the application number 202023313171.X and the invention titled "A thermal runaway-proof component and battery module", the entire contents of which are approved by Reference is incorporated in this application.

technical field

The application belongs to the technical field of battery production and manufacture, and specifically relates to a thermal runaway-proof component and a battery module.

Background technique

Nowadays, all countries are vigorously developing green and high-efficiency secondary batteries. As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small volume, long cycle life, good safety, and environmental protection. It is widely used in portable electrical appliances, power tools, large It has broad application prospects in energy storage and electric transportation power supply. With the launch of the new national standard for power batteries in 2020, more and more battery manufacturers have begun to take thermal runaway protection as the focus of power battery safety considerations. However, in the current thermal runaway, most of the considerations are the thermal insulation between cells and modules. As well as the thermal protection of the upper cover of the battery pack, little consideration is given to the protection of high-temperature conductive substances rushing out of the explosion-proof valve.

When the battery is thermally out of control, a large amount of metal powder, electrolyte and other high-temperature substances are sprayed out and scattered on the surface of the module. In this case, the plastic upper cover of the module is easily melted through, resulting in the exposure of the high-voltage circuit. In the box environment, it is easy to produce arc short circuit after being connected by conductive substances, resulting in secondary thermal runaway, which eventually leads to unstoppable thermal spread.

SUMMARY OF THE INVENTION

One of the purposes of the present application is to provide a thermal runaway-proof component in view of the deficiencies of the prior art, which can form a fire wall channel, isolate high and low voltage devices in the module, high-temperature substances and flames, and reduce the battery core in the module. Probability of thermal diffusion.

In order to achieve the above object, the application adopts the following technical solutions:

An assembly for preventing thermal runaway, comprising a fireproof board; a wire harness board arranged below the fireproof board; wherein the fireproof board is provided with a number of weak parts, the wire harness board is provided with a number of through holes, the Both the weak part and the through hole correspond to the explosion-proof valve of the battery, the weak part is provided with a first protective wall, the through hole is provided with a second protective wall, the weak part is broken under set conditions, the The first protective wall and the second protective wall form a fire escape.

Preferably, the thickness of the weak portion is smaller than that of other parts of the fireproof board, the weak portion is ruptured under a set pressure, and the thickness difference between the weak portion and the fireproof board is less than 10 mm.

Preferably, the first protective wall is arranged on the lower surface of the fireproof board, the first protective wall is arranged around the weak part, the second protective wall is arranged on the upper surface of the wiring harness board, the The second protective wall is arranged around the through hole, the first protective wall and the second protective wall are fixedly connected, and the fixed connection method includes at least one of the following: socket connection, clip connection and bonding.

Preferably, the first protective wall extends downward, the second protective wall extends upward, and a tubular space is formed between the first protective wall and the second protective wall.

Preferably, the outer contour of the first protective wall and the outer contour of the through hole are both larger than the outer contour of the explosion-proof valve.

Preferably, the contour of the first protective wall is smaller than that of the second protective wall, and the first protective wall is sleeved into the second protective wall.

Preferably, several of the weak parts and several of the through holes are arranged in sequence along the length direction.

The second purpose of the present application is to provide a battery module, which includes a plurality of batteries, an explosion-proof valve is provided, and a bus bar is installed between two adjacent batteries, and the bus bar is connected to the poles of the batteries. column; end plate and side plate, enclosing a frame for accommodating a plurality of the batteries; as in the above-mentioned thermal runaway prevention component, the wiring harness board is provided with a mounting groove matched with the busbar, and the wiring harness board is The edges are provided with baffles for limiting the busbars.

Preferably, the battery module further includes a collection board, the bus bar is electrically connected to the collection board, and the collection board is an integrated or split structure.

Preferably, several batteries are arranged in sequence along the length direction, and a heat insulating pad is provided between the large surfaces of two adjacent batteries.

The beneficial effect of the present application is that the present application includes a fireproof board; a wire harness board is arranged below the fireproof board; wherein, the fireproof board is provided with a number of weak parts, and the wire harness board is provided with a number of through holes, so Both the weak portion and the through hole correspond to the explosion-proof valve of the battery, the weak portion is provided with a first protective wall, and the through hole is provided with a second protective wall, the weak portion is broken under set conditions, so the The first protective wall and the second protective wall form a fire passage. When the battery is thermally out of control, a large amount of metal powder, electrolyte and other high-temperature substances are sprayed out and scattered on the surface of the module. In this case, the plastic upper cover of the module is easily melted through, resulting in high-voltage circuits. When exposed to the box environment, it is easy to produce arc short circuit after being connected by conductive substances, resulting in secondary thermal runaway, which eventually leads to unstoppable heat spread. There are through holes, and the weak parts and through holes are in one-to-one correspondence with the explosion-proof valve of the battery. Before the abnormality or thermal runaway of the battery occurs, when the internal pressure of the battery is large, the weak part will rupture, so that the internal pressure of the battery is sharply reduced, and at the same time , the metal powder, electrolyte and other high-temperature substances of the explosion-proof valve will also impact the weak part, and the weak part absorbs part of the impact energy, while the other parts of the fireproof board will not be damaged by the impact. In addition, the first protective wall and the second protective wall Form a fire passage to ensure that high-temperature substances or flames will not splash on the components on the wiring harness board, and prevent short-circuit arcing and flame erosion, resulting in thermal runaway of other cells. Among them, the first protective wall and the second protective wall Using high-temperature refractory fireproof material, the high-temperature jet flame cannot be melted through, which not only protects the parts on the wiring harness board, reduces the probability of exposure of the parts, but can also pass the protective wall to the high-temperature flame sprayed from the explosion-proof valve and conduct electricity. The material is channeled to the outside of the battery module, and the fireproof board is made of a thin plate made of fireproof stone, which can prevent high-temperature substances from melting through the fireproof board. After diffusion, it spreads out in a basin shape when it comes into contact with the fire board, that is, a layer of high temperature barrier is formed between the flame and the parts on the wiring harness board to prevent the internal parts from being eroded by high temperature and reduce the impact of flame and high temperature substances on the battery module. impact, which helps to improve the safety of battery modules. The application can form a fire wall channel, so that the high-temperature eruption flame and material when the battery core is thermally out of control can conduct heat from the channel to the inside of the box, isolate the high and low voltage devices in the module, high-temperature materials and flames, and reduce the heat of the battery core in the module. probability of spreading.

Description of drawings

The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present application.

FIG. 2 is a schematic structural diagram of the first embodiment of the present application after being decomposed.

FIG. 3 is an exploded side view of the first embodiment of the present application.

FIG. 4 is an exploded bottom view of the first embodiment of the present application.

FIG. 5 is a schematic cross-sectional view of the fireproof board according to the first embodiment of the present application.

FIG. 6 is a schematic structural diagram of Embodiment 4 of the present application.

FIG. 7 is a schematic cross-sectional view of the fourth embodiment of the present application.

FIG. 8 is an exploded schematic diagram of Embodiment 5 of the present application.

FIG. 9 is a schematic diagram of several batteries according to Embodiment 6 of the present application.

FIG. 10 is an exploded schematic diagram of several batteries according to Embodiment 6 of the present application.

Among them, the reference numerals are described as follows:

1-fireproof board; 11-weak part; 111-first protective wall;

2-Wire harness board; 20-Through hole; 21-Installation slot; 22-Baffle plate; 201-Second protective wall;

3-battery; 31-explosion-proof valve; 32-pole;

4- busbar;

5-end plate;

6-side plate;

7- collection board;

8-Insulation pad;

X-Length direction.

Detailed ways

As used in the specification and claims, certain terms are used to refer to particular components. It should be understood by those skilled in the art that hardware manufacturers may refer to the same component by different nouns. The description and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as a criterion for distinguishing. As mentioned in the entire specification and claims, "comprising" is an open-ended term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range, and basically achieve technical effects.

Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the application, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

The present application will be further described in detail below with reference to the accompanying drawings 1-10, but it is not intended to limit the present application.

Embodiment 1

An assembly for preventing thermal runaway, comprising a fireproof board 1; a wire harness board 2, arranged below the fireproof board 1; wherein, the fireproof board 1 is provided with a number of weak parts 11, and the wire harness board 2 is provided with a number of through holes 20, weak Both the portion 11 and the through hole 20 correspond to the explosion-proof valve 31 of the battery 3. The weak portion 11 is provided with a first protective wall 111, and the through hole 20 is provided with a second protective wall 201. The protective wall 111 and the second protective wall 201 form a fire escape.

When the battery is thermally out of control, a large amount of metal powder, electrolyte and other high-temperature substances are sprayed out and scattered on the surface of the module. In this case, the plastic upper cover of the module is easily melted through, resulting in high-voltage circuits. When exposed to the box environment, it is easy to cause arcing and short circuit after being connected by conductive substances, resulting in secondary thermal runaway, which eventually leads to unstoppable heat spread. Therefore, see Figures 1 to 5. A number of weak parts 11 are provided, and a number of through holes 20 are provided in the wiring harness board 2, and the weak parts 11 and the through holes 20 are in one-to-one correspondence with the explosion-proof valves 31 of the battery 3, so that the internal pressure of the battery can be reduced before the battery is abnormal or thermally out of control. When it is larger, the weak part 11 ruptures, causing the internal pressure of the battery to decrease sharply. At the same time, the metal powder, electrolyte and other high-temperature substances of the explosion-proof valve will also impact the weak part 11. The weak part 11 absorbs part of the impact energy, and the fireproof plate 1 The other parts of the wire harness will not be damaged by impact. In addition, the first protective wall 111 and the second protective wall 201 form a fire passage to ensure that high-temperature substances or flames will not splash to the components on the wiring harness board 2, preventing short-circuit arcing and flames The corrosion of other cells will cause thermal runaway of other cells. The first protective wall 111 and the second protective wall 201 are made of high-temperature fire-resistant fire-resistant materials, and the high-temperature jet flame cannot be melted and penetrated, which not only protects the zeroes on the wiring harness board 2 The function of the components reduces the probability of exposure of the components, and can also guide the high-temperature flame and conductive substances ejected from the explosion-proof valve 31 to the outside of the battery module through the protective wall. The high temperature material melts through the fireproof board 1, and even if the weak part 11 is broken, it can block the flame and the parts on the wiring harness board 2, so that the flame spreads around, and spreads out in a basin shape when it contacts the fireproof board 1, that is, in the A layer of high temperature barrier is formed between the flame and the parts on the harness board 2, which prevents the internal parts from being eroded by high temperature, reduces the influence of flame and high temperature substances on the battery module, and helps to improve the safety of the battery module.

In the thermal runaway prevention assembly according to the present application, as shown in FIG. 5 , the thickness of the weak portion 11 is smaller than that of other parts of the fireproof board 1 , and the weak portion 11 is ruptured under a set pressure. Specifically, when the material of the weak part 11 is the same as the material of the fireproof board 1, the thickness of the weak part 11 can be made smaller than the thickness of other parts of the fireproof board 1, so that the weak part 11 is ruptured under the set pressure, and the pressure relief and The effect of releasing high temperature flame and high temperature material, when the material of the weak part 11 is different from the material of the fire board 1, the tensile strength of the weak part 11 is smaller than the tensile strength of other parts of the outer fire board It can be broken under constant pressure.

In the thermal runaway prevention assembly according to the present application, the thickness difference between the weak portion 11 and the fireproof board 1 is less than 10 mm. The thickness difference between the weak part 11 and the fireproof board 1 is limited to prevent the thickness difference between the two from being too large, so that the weak part 11 cannot be broken under the set pressure or the impact of high-temperature substances, and at the same time, the fireproof board 1 is prevented from being too thick, This leads to an increase in the production cost of the battery.

In the thermal runaway prevention assembly according to the present application, as shown in FIG. 4 , the first protective wall 111 is disposed on the lower surface of the fireproof board 2 , the first protective wall 111 is disposed around the weak portion 11 , and the second protective wall 201 is disposed on the line On the upper surface of the bundle plate 2 , the second protective wall 201 is arranged around the through hole 20 . Specifically, the first protective wall 111 is disposed around the weak portion 11, and the second protective wall 201 is disposed around the through hole 20. When the thermal runaway occurs in the battery cell, the first protective wall 111 and the second protective wall 201 can withstand high temperature, so that the The function of enclosing the periphery of the flame limits the flame in the protective wall and prevents the flame from overflowing from the fire escape to other parts of the harness board 2 .

In the thermal runaway prevention assembly according to the present application, the first protective wall 111 and the second protective wall 201 are fixedly connected, and the fixed connection method is socket connection, and the contour of the first protective wall 111 is smaller than that of the second protective wall 201 , the first protective wall 111 is sleeved into the second protective wall 201 . In this embodiment, the contour of the first protective wall 111 is smaller than the contour of the second protective wall 201 , so that the first protective wall 111 can be inserted into the second protective wall 201 so that the second protective wall 201 can surround the first protective wall. The circumference of 111 is equivalent to increasing the overall thickness of the protective wall, but the present application is not limited to this. The wall 111 only needs to be sleeved with the first protective wall 111 and the second protective wall 201. At the same time, at least one of the first protective wall 111 and the second protective wall 201 is provided with a buckle portion and/or a clip portion. After completing the first protective wall 111 and the second protective wall 201 After the first protective wall 111 and the second protective wall 201 are sleeved together, the corresponding positions of the first protective wall 111 and the second protective wall 201 are snapped together, which helps to improve the stability and sealing of the protective wall, thereby improving the safety of the battery. sex.

How this application works is:

Several weak parts 11 are provided on the fireproof board 1, and several through holes 20 are provided on the wiring harness board 2, and the weak parts 11 and the through holes 20 are in one-to-one correspondence with the explosion-proof valves 31 of the battery 3, which can prevent the battery from abnormal or thermal runaway before it occurs. , when the internal pressure of the battery is high, the weak part 11 ruptures, so that the internal pressure of the battery decreases sharply. At the same time, the metal powder, electrolyte and other high-temperature substances of the explosion-proof valve will also impact the weak part 11, and the weak part 11 absorbs part of the impact energy, The other parts of the fireproof board 1 will not be damaged by impact. In addition, the first protective wall 111 and the second protective wall 201 form a fireproof channel to ensure that high-temperature substances or flames will not splash to the components on the wiring harness board 2 and prevent short circuits. Arc drawing and flame erosion cause thermal runaway of other cells. Among them, the first protective wall 111 and the second protective wall 201 are made of high-temperature fire-resistant fire-resistant materials, and the high-temperature jet flame cannot be melted and penetrated, which not only protects the wiring harness The function of the parts on the board 2 reduces the probability of exposure of the parts, and can also guide the high-temperature flame and conductive substances ejected from the explosion-proof valve 31 to the outside of the battery module through the protective wall. The fire board 1 is made of fireproof stone material. The thin plate can prevent high-temperature substances from melting through the fireproof board 1. Even after the weak part 11 is broken, it can block the flame and the parts on the wiring harness board 2, so that the flame spreads around, and when it contacts the fireproof board 1, it is scattered in a basin shape Open, that is, a layer of high temperature barrier is formed between the flame and the parts on the harness board 2 to prevent the internal parts from being corroded by high temperature, reduce the impact of flame and high temperature substances on the battery module, and help improve the safety of the battery module. sex.

Embodiment 2

The difference from the first embodiment is that in this embodiment, the first protective wall 111 and the second protective wall 201 are fixedly connected, and the fixed connection method is snap connection, the first protective wall 111 extends downward, and the second protective wall 201 upwards. Extending, a tubular space is formed between the first protective wall 111 and the second protective wall 201 , and the outer contour of the first protective wall 111 and the outer contour of the through hole 20 are both larger than the outer contour of the explosion-proof valve 31 . In this embodiment, the first protective wall 111 and the second protective wall 201 are fixedly connected by clipping, and at least one of the first protective wall 111 and the second protective wall 201 is provided with a buckle portion and/or a clip portion , but this application is not limited to this, the first protective wall 111 and the second protective wall 201 can also be sleeved first, and then the corresponding positions of the first protective wall 111 and the second protective wall 201 are clamped, which is helpful for Improve the stability and sealing of the protective wall, thereby improving the safety of the battery; wherein, the first protective wall 111 extends downward, and the second protective wall 201 extends upward, which can reduce the difference between the first protective wall 111 and the second protective wall 201. The distance between the two can reduce the gap between the two, the first protective wall 111 and the second protective wall 201 can withstand high temperature, play the role of surrounding the flame, confine the flame in the protective wall, and prevent the flame from overflowing from the fire channel to the Other parts of the harness board 2; specifically, the outer contour of the first protective wall 111 and the outer contour of the through hole 20 are usually groove-shaped or circular thin walls, which are larger than the outer contour of the explosion-proof valve 31, which can make the explosion-proof valve 31 smooth. Open to avoid blocking the explosion-proof valve 31 .

Other structures are the same as those in the first embodiment, and are not repeated here.

Embodiment 3

The difference from Embodiment 1 is that in this embodiment, the first protective wall 111 and the second protective wall 201 are fixedly connected, and the fixed connection method is bonding, and the plurality of weak parts 11 and the plurality of through holes 20 are all along the length direction. The Xs are arranged in order. In this embodiment, the first protective wall 111 and the second protective wall 201 are fixedly connected by bonding, that is, glue is applied to the connecting surface of the first protective wall 111 and the second protective wall 201, but this application does not use This is limited, the first protective wall 111 and the second protective wall 201 can also be sleeved first, and then the corresponding positions of the first protective wall 111 and the second protective wall 201 can be bonded, which helps to improve the stability of the protective wall. and sealing, thereby improving the safety of the battery, several weak parts 11 and several through holes 20 are arranged in sequence along the length direction X, and a number of explosion-proof valves 31 of the battery 3 arranged in sequence along the length direction X correspond one by one, However, the present application is not limited to this. According to the actual position of the explosion-proof valve 31 of the battery 3 , the positions of the weak portion 11 and the through hole 20 can be increased, so that the weak portion 11 and the through hole 20 correspond to the explosion-proof valve 31 .

Embodiment 4

A battery module includes a plurality of batteries 3, an explosion-proof valve 31 is provided, a bus bar 4 is installed between two adjacent batteries 3, and the bus bar 4 is connected to the pole 32 of the battery 3; the end plate 5 and the side The board 6 encloses a frame for accommodating several batteries 3; as in the thermal runaway prevention component of the first embodiment, the wiring harness board 2 is provided with a mounting groove 21 which is matched with the bus bar 4, and the edge of the wiring harness board 2 is provided with a The baffle plate 22 for limiting the bus bar 4 .

It should be noted that: as shown in FIG. 6 and FIG. 7 , the bus bar 4 is connected to the pole 32 of the battery 3, so that the batteries 3 can be connected to each other to form a circuit to realize series or parallel connection, and the wiring harness board 2 is provided with a mounting slot 21. The busbar 4 is installed in the installation groove 21, and the surface of the busbar 4 is provided with a bent portion. Specifically, the middle of the busbar 4 is provided with a bent portion, which cooperates with the mounting groove 21 to limit the position of the busbar 4 on the harness board 2. At the same time, the baffle plate 22 is provided on the edge of the wire harness board 2, which can also limit the position of the bus bar 4, and reduce the probability of the bus bar 4 being displaced or shaken.

The battery 3 includes a casing, a top cover and an electric core. The top cover is provided with an explosion-proof valve 31 and a pole 32. The battery 3 has two poles 32, which are a first pole and a second pole, both of which are arranged on the two poles. On the top cover, the first pole may be a positive pole or a negative pole, and correspondingly, the second pole may be a negative pole or a positive pole. In this embodiment, the first pole is used as a positive pole, and the second pole is used as a negative pole. When the first pole is used as a positive pole, the battery cell includes a positive pole piece, a separator and a negative pole piece, which can be stacked and wound in sequence, and the positive pole piece includes a positive pole. The current collector, and the positive electrode active material coated on the surface of the positive electrode current collector, the negative electrode sheet includes the negative electrode current collector, and the negative electrode active material coated on the surface of the negative electrode current collector. The first tab is connected to the positive electrode current collector, the second tab is connected to the negative electrode current collector, the edge of the positive electrode current collector may have a blank area not covered by the positive active material, and the first tab can be directly formed by cutting the blank area . Similarly, the second tab can be directly cut through the blank area of the negative electrode current collector. In addition, the first tab and the second tab can also be fixed to the blank area of the positive electrode sheet and the negative electrode sheet respectively by welding.

Embodiment 5

A battery module includes a plurality of batteries 3, an explosion-proof valve 31 is provided, a bus bar 4 is installed between two adjacent batteries 3, and the bus bar 4 is connected to the pole 32 of the battery 3; the end plate 5 and the side The board 6 encloses a frame for accommodating a number of batteries 3; as in the thermal runaway prevention component of the second embodiment, the wiring harness board 2 is provided with a mounting groove 21 matched with the bus bar 4, and the edge of the wiring harness board 2 is provided with The baffle plate 22 for limiting the bus bar 4 .

It should be noted that: as shown in FIG. 8 , the battery module further includes a collection board 7 , the bus bar 4 is electrically connected to the collection board 7 , and the collection board 7 is of an integrated or split structure. The collection board 7 can collect the voltage and temperature information on the bus bar 4 and feed it back to the battery management system. In this embodiment, the collection board 7 has a split structure and is a flexible circuit board. The board 7 can be combined by multiple pieces, which can be adapted to different battery arrangements and the structure of the bus bar 4, which helps to improve the applicability of the collection board 7, and can also be pasted to the wiring harness board 2 by single-sided adhesive.

Embodiment 6

A battery module includes a plurality of batteries 3, an explosion-proof valve 31 is provided, a bus bar 4 is installed between two adjacent batteries 3, and the bus bar 4 is connected to the pole 32 of the battery 3; the end plate 5 and the side The board 6 encloses a frame for accommodating several batteries 3; as in the thermal runaway prevention component of the third embodiment, the wiring harness board 2 is provided with a mounting slot 21 that is matched with the bus bar 4, and the edge of the wiring harness board 2 is provided with The baffle plate 22 for limiting the bus bar 4 .

It should be noted that: as shown in FIG. 9 and FIG. 10 , several batteries 3 are arranged in sequence along the length direction X, and a heat insulating pad 8 is provided between the large surfaces of two adjacent batteries 3 . Specifically, the thermal insulation pad 8 is a silicone thermal insulation pad, which is arranged between the large surfaces of the battery cells and has materials with extremely low thermal conductivity, such as aerogel, super cotton, etc., which can reduce the passage of a large amount of heat from the thermally runaway battery. The outer casing directly enters the adjacent battery 3, preventing the heat transfer between the outer casing and the external components, so as to delay the transfer rate when the module is thermally runaway.

Based on the disclosure and teaching of the above specification, those skilled in the art to which the present application pertains can also make changes and modifications to the above-described embodiments. Therefore, the present application is not limited to the above-mentioned specific embodiments, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present application.

Claims

An assembly for preventing thermal runaway, comprising:

fire board (1);

a wiring harness board (2), arranged below the fireproof board (1);

Wherein, the fireproof board (1) is provided with several weak parts (11), the wiring harness board (2) is provided with several through holes (20), the weak parts (11) and the through holes (20) ) are corresponding to the explosion-proof valve (31) of the battery (3), the weak portion (11) is provided with a first protective wall (111), and the through hole (20) is provided with a second protective wall (201), so The weak portion (11) is ruptured under a set condition, and the first protective wall (111) and the second protective wall (201) form a fireproof passage.
An assembly for preventing thermal runaway according to claim 1, characterized in that: the thickness of the weak part (11) is smaller than the thickness of other parts of the fireproof board (1), and under a set pressure, the The weak part (11) is broken, and the thickness difference between the weak part (11) and the fireproof board (1) is less than 10 mm.
An assembly for preventing thermal runaway according to claim 1, characterized in that: the first protective wall (111) is arranged on the lower surface of the fireproof board (2), and the first protective wall (111) around the weak part (11), the second protection wall (201) is arranged on the upper surface of the wiring harness plate (2), and the second protection wall (201) is arranged around the through hole (20) , the first protective wall (111) and the second protective wall (201) are fixedly connected, and the fixed connection method includes at least one of the following: socket connection, snap connection and bonding.
The assembly for preventing thermal runaway according to claim 3, wherein the first protective wall (111) extends downward, the second protective wall (201) extends upward, and the first protective wall A tubular space is formed between (111) and the second protective wall (201).
An assembly for preventing thermal runaway according to claim 3, characterized in that: the outer contour of the first protective wall (111) and the outer contour of the through hole (20) are both larger than the explosion-proof valve (31) ) outline.
An assembly for preventing thermal runaway according to claim 3, characterized in that: the contour of the first protective wall (111) is smaller than the contour of the second protective wall (201), and the first protective wall ( 111) Sleeve the second protective wall (201).
The assembly for preventing thermal runaway according to claim 1, characterized in that: a plurality of the weak parts (11) and a plurality of the through holes (20) are arranged in sequence along the length direction (X).
A battery module, characterized in that, comprising:

A plurality of batteries (3) are provided with explosion-proof valves (31), a busbar (4) is installed between two adjacent batteries (3), and the busbar (4) is connected to the batteries (3) ) of the pole (32);

an end plate (5) and a side plate (6), enclosing a frame for accommodating a plurality of the batteries (3);

The assembly for preventing thermal runaway according to any one of claims 1-7, wherein the wiring harness board (2) is provided with a mounting groove (21) matched with the busbar (4), and the edge of the wiring harness board (2) A baffle plate (22) for limiting the position of the bus bar (4) is provided.
The battery module according to claim 8, characterized in that: the battery module further comprises a collection board (7), the busbar (4) is electrically connected to the collection board (7), and the The collecting board (7) has an integrated or split structure.
A battery module according to claim 8, characterized in that: a plurality of batteries (3) are arranged in sequence along the length direction (X), and a large surface of two adjacent batteries (3) is arranged between the large surfaces. Insulation pad (8).