WO2021253329A1

WO2021253329A1 - Battery pack and electric vehicle

Info

Publication number: WO2021253329A1
Application number: PCT/CN2020/096839
Authority: WO
Inventors: 张海飞; 曾朝勇
Original assignee: 东莞新能安科技有限公司
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-12-23

Abstract

Embodiments of the present application relate to the field of batteries, and disclose a battery pack and an electric vehicle. The battery pack comprises: a housing provided with an accommodating cavity; a cell assembly, comprising a plurality of cells and disposed in the accommodating cavity, a first channel and a second channel being provided between the cell assembly and the housing, the second channel being filled with an adhesive to fix the cell assembly and the housing, and a spacer being disposed between the first channel and the second channel; and a pressure relief portion, disposed on the housing. Thus, according to the battery pack provided by the embodiments of the present application, when thermal runaway occurs, the resulting high-temperature gas can smoothly escape by means of the first channel and the pressure relief portion, thereby avoiding the defect that high-temperature gas cannot be discharged timely during thermal runaway of the cell assembly, and eliminating the hidden danger of explosion of the battery pack.

Description

Battery packs and electric vehicles

Technical field

The embodiments of the present application relate to the field of battery technology, and in particular, to a battery pack and an electric vehicle.

Background technique

A battery pack is a device that converts external energy into electrical energy and stores it inside to supply power to external devices when needed. Generally, a battery pack includes a battery cell assembly, a battery management assembly, and a casing for accommodating the above two components. Among them, the battery core assembly as the core component usually includes a plurality of battery cores arranged adjacently and connected in series (or in parallel), and the plurality of battery cores can work together to achieve the desired power output.

In order to ensure that the battery cell assembly can be stably installed in the housing without displacement changes, some manufacturers will use potting glue, silica gel and other glue to fill the battery pack so that the above-mentioned glue is filled on the outer surface of the battery pack The battery core assembly is completely wrapped with the inner wall of the shell, and the battery core assembly is stably fixed to the shell as a whole, thereby overcoming the defect of displacement of the battery core assembly in the shell.

However, the inventor of the present application discovered in the process of realizing the present application that when an abnormal accident such as a short circuit or an overcharge of the internal cell assembly occurs in a battery that has undergone a glue-filling process, the cell assembly will be thermally out of control and generate high-temperature gas, and Glue-filling treatment makes the battery cell assembly in a sealed state, and it is difficult to discharge the above-mentioned high-temperature gas in time. Therefore, the battery that has undergone the glue-filling treatment may cause accidents such as battery explosion when the heat is out of control.

Summary of the invention

The embodiments of the present application are intended to provide a battery pack and an electric vehicle to solve the technical problem that the current battery pack that has been glue-filled cannot discharge high-temperature gas in time when the battery pack is thermally out of control.

The following technical solutions are adopted in the embodiments of this application to solve the technical problems:

A battery pack includes a shell, an electric core assembly and a pressure relief part. The shell is provided with an accommodating cavity. The cell assembly includes a plurality of cells, which are arranged in the containing cavity, a first channel and a second channel are provided between the cell assembly and the housing, and the second channel is filled with glue to fix the cells. Spacers are arranged between the cell assembly and the housing, and the first channel and the second channel. The pressure relief part is provided in the housing.

As a further improvement of the above technical solution, the battery cell includes an electrode assembly, a packaging bag and a first tab, the electrode assembly is arranged in the packaging bag, the first tab extends out of the packaging bag, and the packaging bag A weak portion is provided, and the weak portion is provided between the first channel and the electrode assembly.

As a further improvement of the above technical solution, the packaging bag is provided with a sealing portion, the sealing portion includes a first sealing portion, the first tabs extend out of the packaging bag from the first sealing portion, and the weak portion It includes a first weak portion provided on the first sealing portion.

As a further improvement of the above technical solution, the housing includes a bottom wall, a top wall and a plurality of side walls, the bottom wall and the plurality of side walls form the accommodating cavity, the first channel and the second The two channels are arranged between the battery cell assembly and the plurality of side walls.

As a further improvement of the above technical solution, the spacer is arranged between the side wall and the battery cell assembly.

As a further improvement of the above technical solution, the side wall includes a first side wall, the pressure relief portion is provided on the first side wall, and the weak portion is provided between the first side wall and the electrode assembly.

As a further improvement of the above technical solution, the pressure relief portion is provided on the top wall, a circuit board and a fixing frame are provided between the pressure relief portion and the first channel, and the circuit board is fixed to the fixing frame , The fixing frame is provided with an air passage communicating with the first passage.

As a further improvement of the above technical solution, a circuit board and a fixing frame are provided between the pressure relief portion and the first channel, the circuit board is fixed to the fixing frame, and the fixing frame is provided with the first channel Connected first air passage.

As a further improvement of the above technical solution, the fixing frame includes a first frame and a second frame, the circuit board and the second frame are both fixed to the first frame, and the first frame and the second frame are fixed between the first frame and the second frame. A gap is provided, the battery pack includes a flexible circuit board connected to the battery cell, the flexible circuit board is fixed to the circuit board through the gap, and the air channel is provided in the first bracket and/or the second bracket .

As a further improvement of the above technical solution, the spacer is made of styrofoam, the battery pack includes an insulating member arranged between the cell assembly and the side wall, and the first side wall includes a The fixing part, the insulating part is in contact and connection with the fixing part, the spacer is in contact and connected with the insulating part and the fixing part, and the first channel and the spacer are arranged on different sides of the fixing part.

As a further improvement of the above technical solution, the battery pack includes a filler provided in the second channel, and the fixing portion, the insulating member, the filler, the battery cell assembly and the casing jointly surround Forming a filling area, and the spacers are arranged in the filling area.

As a further improvement of the above technical solution, the spacer is connected to the bottom wall.

As a further improvement of the above technical solution, the battery cell assembly includes a spacer arranged between the battery cores, and the spacer can restrict the passage of the glue.

As a further improvement of the above technical solution, the pressure relief portion is a pressure relief hole or an explosion-proof structure provided in the housing, and the explosion-proof structure includes a rupture disk.

As a further improvement of the above technical solution, the pressure relief hole includes a display panel light hole and/or a key hole which are provided in the housing and communicate with the containing cavity.

As a further improvement of the above technical solution, the side wall includes a second side wall adjacent to the first side wall, the sealing portion includes a second sealing portion, and the second sealing portion is provided on the electrode assembly Between and the second side wall, the weakened portion includes a second weakened portion provided on the second sealing portion, and the first channel is provided between the electrode assembly and the second side wall.

As a further improvement of the above technical solution, the side wall includes a fourth side wall adjacent to the first side wall, the sealing portion includes a third sealing portion, and the third sealing portion is provided on the Between the electrode assembly and the fourth side wall, the weak portion includes a third weak portion provided on the third sealing portion, and the first channel is provided between the electrode assembly and the fourth side wall between.

The embodiments of this application also adopt the following technical solutions to solve their technical problems:

An electric vehicle includes the above-mentioned battery pack.

The beneficial effects of this application are:

The battery pack provided by the embodiment of the present application includes a casing, a battery cell assembly, and a pressure relief portion. Wherein, the housing is provided with a containing cavity for containing the battery cell assembly. A first channel and a second channel are provided between the cell assembly and the housing, and a spacer is provided between the first channel and the second channel to separate the two channels; wherein, the first channel is located between the cell assembly and the Between the shells, the second channel is filled with glue for fixing the cell assembly and the shell. The pressure relief part is arranged on the shell.

Compared with the current battery packs on the market, the battery pack in the embodiment of the present application is fixedly connected to the casing through the glue in the second channel, and when thermal runaway occurs, the high-temperature gas generated can be Smoothly escape through the first channel and the pressure relief part, so as to avoid the disadvantage of not being able to discharge high-temperature gas in time when the battery cell assembly is thermally out of control, so as to eliminate the hidden danger of battery pack explosion.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present application more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings may be obtained based on the structure shown in these drawings.

FIG. 1 is a three-dimensional partial schematic diagram of a battery pack provided by one of the embodiments of this application;

Fig. 2 is a partial exploded schematic diagram of the battery pack in Fig. 1;

3 is an exploded schematic diagram of the battery cell assembly and multiple side walls of the housing in FIG. 2;

4 is a schematic cross-sectional view of the battery pack in FIG. 1 in one direction;

Fig. 5 is a partial enlarged schematic diagram of A in Fig. 3;

Fig. 6 is a three-dimensional schematic diagram of the top wall in Fig. 2;

FIG. 7 is a three-dimensional schematic diagram of the battery core assembly in FIG. 2;

Fig. 8 is an exploded schematic diagram of the battery cell assembly in Fig. 2;

Figure 9 is a three-dimensional schematic diagram of the battery cell;

Figure 10 is an expanded schematic diagram of the battery cell;

Figure 11 is a three-dimensional schematic diagram of a battery management component;

Fig. 12 is a schematic diagram of a projection of the battery management component in one direction.

detailed description

In order to facilitate the understanding of the present application, the following describes the present application in more detail with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to"/"fixed to" another element, it can be directly on the other element, or there may be one or more central elements in between. When an element is said to be "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements in between. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of this application. The terms used in the description of this application are only for the purpose of describing specific embodiments, and are not used to limit the application. The term "and/or" used in this specification includes any and all combinations of one or more related listed items.

In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

In this specification, the "installation" includes welding, screwing, clamping, bonding, etc. to fix or restrict an element or device to a specific position or place, and the element or device can be held in a specific position or place. It can also move within a limited range without moving, and the element or device can be disassembled or cannot be disassembled after being fixed or restricted to a specific position or place, which is not limited in the embodiment of the present application.

Please refer to FIGS. 1 and 2 together, which respectively show a three-dimensional schematic diagram and a partially exploded schematic diagram of the battery pack provided by the present application. The battery pack includes a casing 100, a battery cell assembly 200, and a pressure relief portion (not shown) And the battery management assembly 300. Wherein, the housing 100 is provided with an accommodating cavity 111. The battery cell assembly 200 is received in the accommodating cavity 111 and includes a plurality of battery cells 210. 4, which shows a schematic cross-sectional view of the battery pack in one direction. A first channel 112 and a second channel 113 are provided between the battery cell assembly 200 and the housing 100. The first channel 112 and the second channel 113 are A spacer 114 is arranged between the two channels 113 and separated by the spacer 114; wherein, the second channel 113 is filled with glue to fix the battery cell assembly 200 and the housing 100. The pressure relief portion is provided in the housing 100, and the first channel 112 is located between the cell assembly 200 and the housing. It is worth noting that the "plurality" mentioned in this application means two or more.

The housing 100, referring to FIG. 2 in conjunction with FIG. 4, includes a bottom wall 110, a plurality of side walls 120, and a top wall 130. Wherein, the bottom wall 110 has a plate-like structure as a whole. The plurality of side walls 120 are enclosed to form a hollow rectangular parallelepiped shape extending along the first direction X. One end of the plurality of side walls 120 is fixed to the bottom wall 110 and encloses the bottom wall 110 to form the aforementioned accommodating cavity 111 . In this embodiment, the above-mentioned multiple side walls 120 are specifically a first side wall 121, a second side wall 122, a third side wall 123, and a fourth side wall 124. The shape of the cuboid. Wherein, the first side wall 121 and the third side wall 123 are both provided with two fixing portions 1211 extending along the first direction X at one end close to the cell assembly 200, and the fixing portion 1211 has a threaded hole at one end close to the bottom wall 110 , The bottom wall 110 is provided with adapted via holes at corresponding positions, so that the bottom wall 110 is connected with the first side wall 121 and the third side wall 123 by screws. The top wall 130 is provided at one end of the plurality of side walls 120 away from the bottom wall 110 and substantially closes the opening of the accommodating cavity 111.

For the cell assembly 200, please refer specifically to FIGS. 7 and 8, which respectively show a three-dimensional schematic diagram and an exploded schematic diagram of the cell assembly 200. At the same time, in conjunction with FIGS. 1 to 4, the cell assembly 200 includes a plurality of The battery cells 210 stacked in sequence in the first direction X form the first channel 112 and the second channel 113 between the battery cell assembly 200 and the plurality of side walls 120, and the first channel 112 and the second channel 113 are respectively Extending along the first direction X, that is, the first channel 112 and the second channel 113 are provided between the cell assembly and the plurality of side walls 120. Please refer to FIG. 5, which shows a partial enlarged schematic view at A in FIG. 3. The battery pack also includes two spacers 114 extending along the first direction X. The two spacers 114 are disposed on the battery cell assembly 200 and the housing 100 between the first side walls 121 and respectively abut the cell assembly 200 and the first side walls 121 to separate the gap between the cell assembly 200 and the plurality of side walls 120 into a first channel 112 and Second channel 113. Wherein, the first channel 112 is provided between the cell assembly 200 and the first side wall 121; the second channel 113 is provided in the cell assembly 200 and other side walls (the second side wall 122, Between the third side wall 123 and the fourth side wall 124), and the second channel 113 is filled with glue for fixing the cell assembly 200 and the housing 100. In this embodiment, the glue is potting glue, which is understandable Yes, in other embodiments of the present application, the glue may also be other curable fluid materials such as styrofoam, silica gel, and thermal conductive glue, which are not limited here.

Optionally, the above-mentioned spacer 114 is a cured styrofoam. The battery pack is provided with two filling areas, so that the styrofoam is foamed and molded into the above-mentioned spacer 114 in the two filling areas according to expected rules. In this embodiment, each of the above-mentioned filling areas is formed by the above-mentioned fixing portion 1211, the insulating member 115, the cell assembly 200, the filling member 116 and the housing 100. 4, in conjunction with other drawings, the two insulating members 115 respectively correspond to the two fixing portions 1211 on the first side wall 121, and an insulating member 115 is embedded between a fixing portion 1211 and the cell assembly 200 In between, the insulating member 115 can restrict the passage of the styrofoam; the two filler members 116 correspond to the fixing portions 1211 on the first side wall 121, respectively, and a filler member 116 is embedded in the battery cell assembly 200 and the second side. Between the walls 122, another filler 116 is embedded between the cell assembly 200 and the fourth side wall 124, and the filler 116 can restrict the passage of styrofoam; in this way, the two fixing portions 1211 of the first side wall 121 are The corresponding insulator 115, the corresponding filler 116, the cell assembly 200, and the housing 100 respectively enclose the aforementioned filling area extending along the first direction X, and the aforementioned spacers are provided in the filling area. That is, the insulating member 115 is in contact with the fixing portion 1211, the spacer 116 is in contact with the corresponding insulating member 115 and the corresponding fixing portion 1211, and the first channel and the spacer 116 are located on different sides of the corresponding fixing portion. Further optionally, one end of the aforementioned spacer 114 extends to connect to the bottom wall 110, and the other end extends to an end of the cell assembly 200 away from the bottom wall 110. It can be understood that in some other embodiments of the present application, the insulating member 115 may be omitted. In addition, in some other embodiments of the present application, the above-mentioned filling area can also be filled with styrofoam (i.e., spacers) and glue at the same time; specifically, in the actual foaming process of the styrofoam in the above-mentioned filling area, the foaming The glue may not fill the entire foaming area, so along the vertical direction shown in FIG. 4, there may be a gap between the foaming rubber and the filler 116. This application further fills the above-mentioned glue in the above-mentioned filling area to fill the glue. The gap between the styrofoam and the filler 116 is that the above-mentioned glue is arranged between the styrofoam and the filler.

For the battery cell 210, please refer specifically to FIGS. 9 and 10, which respectively show a three-dimensional schematic diagram and an expanded schematic diagram of a single cell 210. At the same time, in conjunction with FIGS. 7 and 8, the cell 210 includes an electrode assembly 211, a packaging bag 212, and Two first pole ears 213. Wherein, the electrode assembly 211 is arranged inside the packaging bag 212, and the packaging bag 212 is formed by bending a whole piece of material to wrap the electrode assembly 211, and at the same time, the peripheral area of the electrode assembly 211 is sealed and connected by means of adhesive, hot melt, etc.; The sealed connection portion forms a sealed portion (not shown) of the packaging bag 212. In order to facilitate the high temperature gas inside the battery cell 210 to escape from a specific part in a timely and targeted manner when it is thermally out of control, the packaging bag 212 is provided with a weak part (not shown) in the area of the sealing part. ), the strength of the weak part is lower than the strength of other parts, and the high-temperature gas generated by the battery cell 210 will quickly break through the weak part and escape. In this embodiment, the weak portion is provided between the first channel 112 and the electrode assembly 211, that is, the weak portion is provided between the electrode assembly 211 and the first side wall 121; of course, in other embodiments, the weak The part may also be arranged between the electrode assembly 211 and other side walls.

One end of the first tab 213 is connected to the electrode assembly 211, and the other end extends out of the packaging bag 212. The pair of first tabs 213 are respectively a positive pole and a negative pole. Optionally, the sealing portion includes a first sealing portion provided between the electrode assembly 211 and the first channel 112, and the first tab 213 extends out of the packaging bag 212 from the first sealing portion. In this embodiment, The first sealing portion is provided on the top edge of the battery core and corresponds to the first side wall 121. The sealing portion further includes a second sealing portion and a third sealing portion respectively provided on both sides of the battery core. The second sealing portion The third sealing portion corresponds to the second side wall 122 and the fourth side wall 124 respectively. The above-mentioned weak portion includes a first weak portion provided on the first sealing portion. Each first tab 213 includes a connecting portion and a bending portion. One end of the connecting portion is connected to the electrode assembly 211, and the other end passes through the packaging bag 211 and extends in a direction away from the packaging bag 212 along the second direction Y, wherein , The second direction Y is a direction perpendicular to the first direction X; one end of the bent portion is connected to an end of the connecting portion away from the main body, and the other end extends along the first direction X. Between any two adjacent battery cores 210, the extension directions of the bent portions of the two corresponding first tabs 213 are opposite to each other, wherein a pair of the bent portions of the adjacent two battery cores 210 that are close to each other overlap each other. Welding and fixing. In this embodiment, the battery cores 210 are connected in series, and the polarity of the first tab 213 corresponding to the position of the battery cores 210 is opposite. It is understandable that in other embodiments of the present application, the cells 210 can also be connected in parallel. In this case, it is only necessary to set the first pole ears connected to each other to have the same polarity on the basis of the above, and pass a The copper bar is connected to the first tab of each positive polarity, and the first tab of each negative polarity is connected through another copper bar.

Further, in order to avoid the bending part being easily damaged and deformed due to suspension, the battery cell assembly 200 further includes a first support 220. Specifically, please refer back to FIG. 7 and FIG. 8, and in conjunction with other drawings, the first support member 220 is provided at one end of the packaging bag 212 close to the first channel 112 and abuts against the packaging bag 212 and the insulating member 115, respectively. Along the first direction X, a first support 220 abuts against the packaging bags 212 of the two battery cells 210 at the same time; the bent portion of the first tab 213 is carried on the end of the first support 220 away from the packaging bags 212. Optionally, the first support 220 is made of foam, which has an air-permeable structure. On the one hand, the first support 220 can be used to carry the bent portion of the first tab 213, and on the other hand, it can also allow batteries to The high temperature gas generated by 210 passes through.

Furthermore, in order to prevent the first tab 212 of the cell assembly 200 from contacting other metal parts and cause circuit failure during the assembly or use of the battery pack, the cell assembly 200 further includes an insulating baffle 230. Referring specifically to FIG. 7, the insulating baffle 230 is provided at one end of the battery cell assembly 200 where the first tab 213 is provided, and it entirely covers the first tab 213 of each cell 210 and is fixed to each cell 210. The melting temperature of the insulating baffle 230 is a first threshold, which will melt when subjected to a temperature greater than the above-mentioned first threshold. If the first threshold is less than the thermal runaway temperature of the battery pack, the high-temperature gas generated by the cell assembly 200 can penetrate The insulating baffle 230 enters the first channel 112 and then escapes the housing 100 via the above-mentioned pressure relief portion.

The pressure relief portion is arranged in the housing 100 and is weaker than other parts of the housing 100. The first channel 112 is specifically located between the battery cell assembly 200 and the pressure relief portion, and the pressure relief portion is used for When the cell assembly 200 produces high-temperature gas due to factors such as thermal runaway, the high-temperature gas is passed through so that the high-temperature gas escapes out of the casing 100. In this embodiment, the pressure relief portion is a pressure relief hole structure; specifically, referring to FIG. 6, which shows a three-dimensional schematic diagram of the top wall 130, the outer surface of the top wall 130 is provided with a communication port 111 The display panel light hole 131 and the key hole 132 have through-hole structures, and the pressure relief hole includes the display panel light hole 131 and/or the key hole 132. An air channel is also provided between the pressure relief portion and the first channel, that is, the air channel is in communication with the first channel, and the high-temperature gas escaping from the battery cell assembly 200 sequentially passes through the first channel, the air channel, and the leak The pressure hole escapes the housing 100. It is understandable that in other embodiments of the present application, the pressure relief portion may also have other structures, as long as it can allow the high-temperature gas to pass through when the cell assembly generates high-temperature gas; for example: In other embodiments, the pressure relief portion may also be an explosion-proof structure, the explosion-proof structure includes a rupture disk, high-temperature gas rushes through the rupture disk to flow out of the housing 100, the rupture disk may be a low-strength weakening of the housing 100 itself In the area, the rupture disk may also be a film structure that is additionally covered after the housing 100 is opened, and the rupture disk may also be an explosion-proof membrane structure on an explosion-proof valve installed on the housing 100. In addition, the pressure relief portion may also be provided at other locations. For example, in some embodiments, the pressure relief portion is provided on the first side wall.

In this embodiment, the battery pack further includes a buffer assembly 400. For details, please refer to FIG. 8 in conjunction with other drawings. The buffer assembly 400 has certain elasticity. It is arranged between at least a part of the cell assembly 200 and the side wall of the housing 100, and cooperates with the fixing portion 1211, the insulating member 115, and the filling member 116, so that each battery The core 210 and the first support 220 can be maintained in a relatively fixed position. In this embodiment, the buffer assembly 400 can restrict the passage of the above-mentioned glue, which is beneficial to reduce the amount of glue and reduce the cost. The buffer assembly 400 includes an end buffer 410 and a side buffer 420; wherein the end buffer 510 is provided between the battery cell assembly 200 and the third side wall 123 of the housing 100, and the side buffer 242 is provided in the electrical Between the core assembly 200 and the second side wall 122 (or the fourth side wall 124 or the bottom wall 110) of the housing 100. Optionally, the end buffer 510 and/or the side buffer 520 are foam.

Further, the above-mentioned battery cell assembly 200 further includes a spacer 240 arranged between the battery cores 210. Specifically, referring to FIG. 8, the spacer 240 has a flat sheet-like structure as a whole, and can restrict the passage of the above-mentioned glue. The spacer 240 is arranged so that there is a certain safety gap between two adjacent electric cores 210, which is safe The gap provides a certain margin for the expansion of the battery core 210. Optionally, the isolating member 240 is an elastic member. When the cell is thermally out of control, the isolating member 240 can efficiently absorb the expansion of the cell 210 through elastic deformation, thereby preventing the cell 210 from being deformed and exploding due to excessive air pressure. The hidden dangers.

For the battery management assembly 300, please refer to FIGS. 11 and 12, which respectively show a three-dimensional schematic diagram of the battery management assembly 300 and a projection schematic view in one direction. At the same time, in conjunction with other drawings, the battery management assembly 300 is disposed in the above-mentioned accommodating cavity 111, and located between the first channel and the pressure relief part, it includes a circuit board 310, a fixing frame 320, two copper bars 330 (FIG. 4), and a flexible circuit board 340 (FIG. 4). The circuit board 310 is fixed to the fixing frame 320 and electrically connected to the battery cell assembly 200, and is used to control and manage the battery cell assembly 200 to complete the desired work in a timely manner. The fixing frame 320 includes a first bracket 321 and a second bracket 322. Wherein, the first bracket 321 is in the shape of a box placed away from the battery cell assembly 200, and defines a receiving cavity (not shown) for receiving the circuit board 310 and the second bracket 412; along the first direction X, the first A bracket 321 is provided on one side of the battery cell assembly 200 and is located on the path of the high-temperature gas flowing from the first channel 112 to the pressure relief portion, and the circuit board 310 is specifically fixed to the first bracket 321. The second bracket 322 is received in the above-mentioned receiving cavity and fixed to the first bracket 321, and a gap 323 is provided between the first bracket 411 and one end of the first side wall 121. The second bracket 322 is used to install the two copper bars. 330. One end of the copper bar 330 away from the second bracket 322 is connected to the positive electrode or the negative electrode of the battery cell assembly 200. One end of the flexible circuit board 340 is electrically connected to the tabs of the above-mentioned battery cells 210, and the other end first passes through the first bracket 321 and is close to the end of the battery cell assembly 200, and then passes through the gap 323 to be fixed and electrically connected to the circuit board 310 .

In order to facilitate the discharge of the high-temperature gas generated by the battery cell assembly 200, the fixing frame 320 is provided with a first air passage 350 communicating with the first passage 112. In this embodiment, the first air passage 350 is provided in the first support 321 and the second support 322 at the same time, and it penetrates the first support 321 and the second support 322 as a whole; specifically, it includes the first support provided in the first support 321 A through hole, and a second through hole provided in the second bracket 322, the second through hole communicates with the above-mentioned first through hole. That is, the high-temperature gas escaping from the battery cell assembly 200 sequentially escapes the housing 100 through the above-mentioned first passage, part of the air passage, first air passage, part of the air passage, and the pressure relief portion. It is understandable that in other embodiments of the present application, the first air passage may also be provided only in the first support; when the second support is not received in the receiving cavity of the first support, the above-mentioned first air passage may also be only Set in the second bracket.

The battery pack provided by the embodiment of the present application includes a housing 100, a battery cell assembly 200, a pressure relief portion, and a battery management assembly 300. Wherein, the housing 100 is provided with a accommodating cavity 111 for accommodating the battery cell assembly 200. A first channel 112 and a second channel 113 are provided between the cell assembly 200 and the housing 100, and a spacer 114 is provided between the first channel 112 and the second channel 113 to separate the two channels; A channel 112 is located between the cell assembly 200 and the housing 100, and the second channel 113 is filled with glue for fixing the cell assembly 200 and the housing 100. The pressure relief part is provided on the housing 100. Then, compared with the battery packs currently on the market, the battery pack in the embodiment of the present application provides the battery cell assembly 200 and the housing 100 fixedly connected by the glue in the second channel 113, and when thermal runaway occurs, The high-temperature gas can escape through the first channel 112 and the pressure relief portion, so as to avoid the disadvantage that the high-temperature gas cannot be discharged in time when the battery cell assembly 200 is thermally out of control, so as to eliminate the hidden danger of battery pack explosion.

It should be understood that even though the first tab 213 corresponds to the first side wall 121 in the above embodiment, and the first weak portion is disposed between the battery cell assembly 200 and the first side wall 121, the application is not limited to this. For example, in some embodiments, the first tab 213 still corresponds to the first side wall 121, and the above-mentioned weak portion further includes a second weak portion provided on the second sealing portion, that is, the second weak portion and the second sealing portion They are all located between the electrode assembly 211 and the second side wall 122. Correspondingly, the first channel 112 is provided between the electrode assembly 211 and the second side wall 122. For another example, in some embodiments, the above-mentioned weak portion further includes a third weak portion provided on the third sealing portion, that is, the third weak portion and the third sealing portion are both located between the electrode assembly 211 and the fourth side wall 124 Accordingly, the first channel 112 is provided between the electrode assembly 211 and the fourth side wall 124. For another example, in some embodiments, the weakened portion includes at least two of the first weakened portion, the second weakened portion, and the third weakened portion. Accordingly, the first channel 112 is provided in the weakened portion (the first weakened portion). Part or the second weak part or the third weak part) and the side wall corresponding to the weak part. In addition, the location of the pressure relief portion can also vary with the location of the first weak portion. For example, when the first channel is located between the electrode assembly 211 and the second side wall 122, the pressure relief portion can be located on the second side wall. Side wall 122; for example, when the first channel is located between the electrode assembly 211 and the fourth side wall 124, the pressure relief portion may be provided on the fourth side wall 124.

Based on the same inventive concept, this application also provides another battery pack. In order to distinguish it from the battery pack in the first embodiment, this battery pack will be referred to as the second battery pack hereinafter, and the battery pack in the first embodiment Called the first battery pack. The main difference between the second battery pack and the first battery pack is:

The first battery pack has only one first channel 112, and the battery cell 210 includes two first tabs 213, and the two first tabs 213 are both arranged on the same side of the battery;

The second battery pack is also provided with another first channel. The battery cell 210 includes a first tab and a second tab. The first tab and the second tab are arranged on different sides of the battery.

Specifically, the other first channel is disposed between the cell assembly and the third side wall. Two spacers are arranged between the battery cell assembly 200 and the third side wall. The two spacers, the battery cell assembly and the third side wall jointly enclose another first channel. The area of the gap excluding the first channel is the second channel, that is, the two spacers separate the other first channel from the second channel. Optionally, the above-mentioned sealing portion further includes a fourth sealing portion provided between the electrode assembly and the third side wall, and the packaging bag further includes a fourth weak portion provided on the fourth sealing portion, that is, it is generated by a single cell The high-temperature gas can escape at least partially through the fourth weakened portion, and then escape the shell through the other first channel and the pressure relief portion. Furthermore, a pressure relief portion may also be provided on the third side wall.

The first tab is provided between the electrode assembly and the first side wall, and has the same structure as the first tab 213 in the first battery pack; the second tab is provided between the electrode assembly and the third side wall, It also has the same structure as the first tab 213 in the first battery pack. One end of the second tab is connected to the electrode assembly, and the other end extends out of the packaging bag from the fourth sealing portion.

Compared with the first battery pack in the first embodiment, this embodiment provides that the second battery pack can simultaneously release the pressure through the two first channels and the pressure relief portion when the thermal runaway occurs, and its exhaust efficiency is higher. Therefore, the second battery pack has a higher exhaust efficiency. The explosion-proof effect of the second battery pack is better.

It is understandable that, in some other embodiments of the second battery pack, the pressure relief portion may also be provided on the third side wall, or the number of pressure relief portions is multiple, and at least one pressure relief portion is provided on the top wall. At least one pressure relief portion is provided on the first side wall, and at least one pressure relief portion is provided on the third side wall. In addition, in the second battery pack, the first weak portion and/or the fourth weak portion may also be provided not corresponding to the tabs, that is, the first weak portion and/or the fourth weak portion are provided between the electrode assembly and the second Between the side walls 122 (or the fourth side wall 124).

Based on the same inventive concept, the present application also provides an energy storage device, which includes the battery pack in any of the foregoing embodiments. Since the battery pack is included, the energy storage device can discharge high-temperature gas in time when the battery pack is thermally out of control, eliminating the hidden danger of battery pack explosion.

Based on the same inventive concept, this application also provides an electric vehicle, which includes the above-mentioned energy storage device, that is, the electric vehicle also includes the above-mentioned battery pack. The electric vehicle can discharge high-temperature gas in time when the battery pack is thermally out of control, eliminating the hidden danger of battery pack explosion.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, not to limit them; under the idea of this application, the above embodiments or the technical features in different embodiments can also be combined. The steps can be implemented in any order, and there are many other variations in different aspects of the application as described above. For the sake of brevity, they are not provided in the details; although the application has been described in detail with reference to the foregoing embodiments, it is common in the art Technical personnel should understand that: they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the implementations of this application Examples of the scope of technical solutions.

Claims

A battery pack, characterized in that it comprises:

The shell is provided with an accommodating cavity;

The battery cell assembly includes a plurality of stacked battery cells arranged in the accommodating cavity, a first channel and a second channel are provided between the battery cell assembly and the housing, and the second channel is filled with glue, To fix the cell assembly and the casing, a spacer is arranged between the first channel and the second channel; the pressure relief part is arranged on the casing.
The battery pack according to claim 1, wherein the battery cell comprises an electrode assembly, a packaging bag and a first tab, the electrode assembly is arranged in the packaging bag, and the first tab extends out of the packaging bag The packaging bag is provided with a weak portion, and the weak portion is provided between the first channel and the electrode assembly.
The battery pack according to claim 2, wherein the packaging bag is provided with a sealing portion, the sealing portion includes a first sealing portion, and the first tab extends out of the packaging bag from the first sealing portion , The weakened portion includes a first weakened portion provided on the first sealing portion.
The battery pack according to any one of claims 1-3, wherein the housing includes a bottom wall, a top wall, and a plurality of side walls, and the bottom wall and the plurality of side walls form the housing The cavity, the first channel and the second channel are arranged between the cell assembly and the plurality of side walls.
The battery pack according to claim 4, wherein the spacer is provided between the side wall and the battery cell assembly.
The battery pack according to claim 4, wherein the side wall comprises a first side wall,

The pressure relief portion is provided on the first side wall, and the weak portion is provided between the first side wall and the electrode assembly.
The battery pack according to claim 5, wherein the pressure relief portion is provided on the top wall, the weak portion is provided between the side wall and the electrode assembly, and the battery pack includes a Air channel.
The battery pack according to claim 7, wherein a circuit board and a fixing frame are provided between the pressure relief portion and the first channel, the circuit board is fixed to the fixing frame, and the fixing frame The frame is provided with a first air passage communicating with the first passage.
8. The battery pack according to claim 8, wherein the fixing frame comprises a first frame and a second frame, the circuit board and the second frame are both fixed to the first frame, and the first frame A gap is provided between the battery and the second bracket, the battery pack includes a flexible circuit board connected to the battery, the flexible circuit board is fixed to the circuit board through the gap, and the first air channel is provided in the first air channel. A bracket and/or a second bracket.
The battery pack according to claim 5, wherein:

The spacer is made of styrofoam, the battery pack includes an insulating member arranged between the cell assembly and the side wall, the first side wall includes a fixing part arranged in the first channel, and the insulating member is connected to the The fixing part is in contact and connection, the spacer is in contact and connected with the insulating member and the fixing part, and the first channel and the spacer are arranged on different sides of the fixing part.
The battery pack according to claim 10, wherein the battery pack comprises a filler provided in the second channel, the fixing part, the insulating member, the filler, the battery cell assembly and the The shells jointly enclose a filling area, and the spacers are arranged in the filling area.
The battery pack according to claim 10, wherein the spacer is connected to the bottom wall.
The battery pack according to claim 5, wherein the battery cell assembly includes a spacer arranged between the battery cores, and the spacer can restrict the passage of the glue.
The battery pack according to claim 1, wherein the pressure relief portion is a pressure relief hole or an explosion-proof structure provided in the housing, and the explosion-proof structure includes a rupture disk.
The battery pack according to claim 14, wherein the pressure relief hole comprises a display board light hole and/or a key hole provided in the housing and communicating with the accommodating cavity.
An electric vehicle, characterized by comprising the battery pack according to any one of claims 1 to 15.