Battery module and electric equipment

Abstract

The embodiment of the utility model relates to the technical field of batteries, in particular to a battery module and electric equipment, the battery module comprises a box body, a battery cell assembly, a control assembly and a heat insulation protective cover, the box body is provided with an accommodating cavity, and the battery cell assembly, the control assembly and the heat insulation protective cover are sequentially arranged in the accommodating cavity along a first direction; the control assembly comprises a heat insulation support and a control circuit board electrically connected with the battery cell assembly, the heat insulation support covers the battery cell assembly, the control circuit board is fixed to the side face, away from the battery cell assembly, of the heat insulation support, and the heat insulation support is provided with a flow guide opening corresponding to an anti-explosion valve of the battery cell assembly; a diversion wall extends from the periphery of the diversion port in the direction far away from the battery cell assembly, a diversion channel communicated with the diversion port is defined by the inner wall of the diversion wall, an opening matched with the diversion wall is formed in the heat insulation protection cover, and one end, far away from the battery cell assembly, of the diversion wall penetrates through the opening. According to the embodiment of the utility model, the possibility that the sprayed electrolyte directly contacts the control circuit board is reduced.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of batteries, and in particular to a battery module and an electrical device. Background Art

[0002] A battery module generally includes a battery cell assembly and a control circuit board. The control circuit board is disposed on the top of the battery cell assembly and is electrically connected to the battery cell assembly. The control circuit board is used to control the charging and discharging of the battery cell assembly, and the battery cell assembly is usually formed by electrically connecting a plurality of battery cells, which has important applications in the fields of electric vehicles, power tools, renewable energy storage systems, etc.

[0003] However, the battery cells of the current battery modules on the market are prone to thermal runaway during the charging and discharging process. When the battery cell is in thermal runaway, the electrolyte in the battery cell will break through the explosion-proof valve at the top of the battery cell and spray the electrolyte outward. The control circuit board is directly disposed on the top of the battery cell, and the sprayed electrolyte is likely to directly contact the control circuit board, resulting in damage to the control circuit board and affecting the use of the battery module. Summary of the Utility Model

[0004] In view of the above problems, the embodiments of the present utility model provide a battery module and an electrical device, which overcome the above problems or at least partially solve the above problems.

[0005] According to one aspect of the embodiments of the present utility model, a battery module is provided, which includes a box body, a battery cell assembly, a control assembly, and a heat insulation protection cover; the box body is provided with a receiving cavity; the battery cell assembly, the control assembly, and the heat insulation protection cover are sequentially disposed in the receiving cavity along a first direction; the control assembly includes a heat insulation support and a control circuit board electrically connected to the battery cell assembly. The heat insulation support covers the battery cell assembly, the control circuit board is fixed to the side of the heat insulation support facing away from the battery cell assembly, the heat insulation support is provided with a diversion port corresponding to the explosion-proof valve of the battery cell assembly, and a diversion wall extends from the periphery of the diversion port in a direction away from the battery cell assembly. The inner wall of the diversion wall encloses a diversion channel communicating with the diversion port; the heat insulation protection cover is provided with an opening matching the diversion wall, and one end of the diversion wall away from the battery cell assembly passes through the opening; wherein, the electrolyte ejected from the explosion-proof valve of the battery cell assembly can be ejected to the side of the heat insulation protection cover facing away from the control circuit board through the diversion channel.

[0006] In some embodiments, the control assembly further includes an isolation cover, the isolation cover is disposed at one end of the diversion wall away from the battery cell assembly to cover the diversion channel; an indentation groove is recessed on the surface of the isolation cover, so that the thickness of the isolation cover at the indentation groove is less than the thickness of the isolation cover outside the indentation groove, and the indentation groove is annularly distributed on the surface of the isolation cover.

[0007] In some embodiments, a diversion groove is provided on the surface of the heat insulation protective cover facing away from the control circuit board; along the extending direction of the diversion groove, both ends of the diversion groove protrude from the battery cell assembly; the diversion groove is spaced apart from the opening.

[0008] In some embodiments, the battery module includes two partition bars disposed in the receiving cavity; along the extending direction of the diversion groove, the two partition bars are respectively located on both sides of one end of the battery cell assembly away from the heat insulation protective cover; the partition bar includes a partition portion and a fixing portion that are bent and connected to each other, the side wall of the fixing portion is fixed to the bottom wall of the receiving cavity, and the side wall of the partition portion faces the battery cell assembly.

[0009] In some embodiments, the battery module includes two positioning rods fixed to the bottom wall of the receiving cavity, and the two positioning rods and the two partition bars jointly enclose a receiving groove, and the battery cell assembly is disposed in the receiving groove.

[0010] In some embodiments, the box body includes a liquid cooling plate and a top cover, and the top cover is covered on the liquid cooling plate along the first direction to enclose the receiving cavity; the battery cell assembly is disposed on the liquid cooling plate, and the liquid cooling plate is provided with a liquid inlet, a liquid cooling channel and a liquid outlet that are sequentially communicated.

[0011] In some embodiments, an external explosion-proof valve is provided on the top cover, wherein the gas in the receiving cavity can be discharged from the external explosion-proof valve to the outside of the receiving cavity.

[0012] In some embodiments, the battery cell assembly includes a plurality of battery cells stacked in sequence, an aerogel is disposed between any two adjacent battery cells, end plates are respectively disposed at the head and tail ends after the plurality of battery cells are stacked in sequence, an insulating sheet is disposed between the end plate and the battery cell, and a tie strap is wound around the outside of the end plate and the plurality of battery cells stacked in sequence.

[0013] In some embodiments, the number of the battery cell assemblies and the control assemblies is several, and the several battery cell assemblies are uniformly arranged in the receiving cavity. A heat insulation bracket of a control assembly covers a battery cell assembly, and a control circuit board of a control assembly is fixed to a side of the heat insulation bracket of the control assembly facing away from the battery cell assembly; the number of openings of the heat insulation protective cover is several, and one opening cooperates with a diversion wall of a heat insulation bracket of a control assembly.

[0014] According to one aspect of the embodiments of the present invention, an electrical device is provided, including the above-mentioned battery module.

[0015] The beneficial effects of the embodiments of the present utility model are as follows: Different from the prior art, a battery module provided by the embodiments of the present utility model includes a box body, a battery cell assembly, a control assembly, and a heat insulation protection cover. The battery cell assembly, the control assembly, and the heat insulation protection cover are sequentially arranged in the receiving cavity of the box body along a first direction. The control assembly includes a heat insulation bracket and a control circuit board electrically connected to the battery cell assembly. The heat insulation bracket covers the battery cell assembly, the control circuit board is fixed to the side of the heat insulation bracket facing away from the battery cell assembly, a diversion port corresponding to the explosion-proof valve of the battery cell assembly is formed in the heat insulation bracket, a diversion wall extends from the periphery of the diversion port in a direction away from the battery cell assembly, and an inner wall of the diversion wall encloses a diversion channel communicating with the diversion port. An opening matching the diversion wall is formed in the heat insulation protection cover, and one end of the diversion wall away from the battery cell assembly passes through the opening. The electrolyte ejected from the explosion-proof valve of the battery cell assembly of the battery module in the embodiments of the present utility model can be ejected to the side of the heat insulation protection cover facing away from the control circuit board through the diversion channel, and the heat insulation protection cover further shields the control circuit board, reducing the possibility of the ejected electrolyte directly contacting the control circuit board, thereby reducing the possibility of damage to the control circuit board. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the drawings without creative efforts.

[0017] Figure 1 is a perspective view of the battery module provided by the embodiments of the present utility model;

[0018] Figure 2 is an exploded view of the battery module provided by the embodiments of the present utility model;

[0019] Figure 3 is a cross-sectional view of the battery module provided by the embodiments of the present utility model;

[0020] Figure 4 is a partial cross-sectional view of the assembled battery cell assembly, control assembly, and heat insulation protection cover provided by the embodiments of the present utility model;

[0021] Figure 5 is a structural diagram of the battery module provided by the embodiments of the present utility model after removing the top cover;

[0022] Figure 6 is Figure 5 a structural diagram of the battery module after removing the top cover from another perspective;

[0023] Figure 7It is a schematic structural diagram of the heat insulation protection cover provided by an embodiment of the present utility model;

[0024] Figure 8 It is a schematic structural diagram after the battery cell assembly and the control assembly provided by an embodiment of the present utility model are assembled;

[0025] Figure 9 It is a schematic structural diagram of the control assembly provided by an embodiment of the present utility model;

[0026] Figure 10 It is a schematic structural diagram of the heat insulation bracket provided by an embodiment of the present utility model;

[0027] Figure 11 It is a schematic structural diagram of the isolation cover provided by an embodiment of the present utility model;

[0028] Figure 12 It is a schematic structural diagram after the liquid cooling plate, the isolation bar and the positioning rod provided by an embodiment of the present utility model are assembled;

[0029] Figure 13 It is a schematic structural diagram of the isolation bar provided by an embodiment of the present utility model;

[0030] Figure 14 It is a schematic structural diagram of the battery cell assembly provided by an embodiment of the present utility model;

[0031] Figure 15 It is an exploded schematic diagram of the battery cell assembly provided by an embodiment of the present utility model.

[0032] The reference numerals in the specific implementation manners are as follows:

[0033] 100, battery module;

[0034] 1, box body; 1a, accommodation cavity; 11, liquid cooling plate; 111, liquid inlet; 112, liquid outlet; 12, top cover; 121, external explosion-proof valve;

[0035] 2, battery cell assembly; 21, battery cell; 211, explosion-proof valve; 22, aerogel; 23, insulating sheet; 24, end plate; 25, tie strap;

[0036] 3, control assembly; 31, heat insulation bracket; 311, diversion port; 312, diversion wall; 313, diversion channel; 32, control circuit board; 33, isolation cover; 331, embossing groove;

[0037] 4, heat insulation protection cover; 41, opening; 42, diversion groove;

[0038] 5, isolation bar; 51, fixing part; 52, isolation part;

[0039] 6, positioning rod;

[0040] 7. Accommodating groove;

[0041] X, First direction. Detailed implementation manner

[0042] For the convenience of understanding the present utility model, the following will describe the present utility model 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" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are only for the purpose of illustration.

[0043] 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 to which the present utility model belongs. The terms used in this specification in the description of the present utility model are only for the purpose of describing specific embodiments, and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0044] A battery module generally includes a battery cell assembly and a control circuit board. The control circuit board is disposed on the top of the battery cell assembly, and the control circuit board is electrically connected to the battery cell assembly. The control circuit board is used to control the charging and discharging of the battery cell assembly, and the battery cell assembly is usually formed by electrically connecting a plurality of battery cells, and it has important applications in the fields of electric vehicles, electric tools, renewable energy storage systems, etc.

[0045] In the existing battery module, the battery cells are prone to thermal runaway during the charging and discharging process. When the battery cells are in thermal runaway, the electrolyte in the battery cells will break through the explosion-proof valve at the top of the battery cells and spray the electrolyte outward. The control circuit board is directly disposed on the top of the battery cells, and the sprayed electrolyte is likely to directly contact the control circuit board, thereby causing damage to the control circuit board and affecting the use of the battery module.

[0046] In the embodiment of the present utility model, a diversion channel is provided above the explosion-proof valve of the battery cell, so that the electrolyte sprayed out by the explosion-proof valve can be sprayed out through the diversion channel to the side of the heat insulation protection cover away from the control circuit board. The heat insulation protection cover further shields the control circuit board, reducing the possibility that the sprayed electrolyte directly contacts the control circuit board, thereby reducing the possibility of damage to the control circuit board.

[0047] For the convenience of readers to understand the inventive concept of the present utility model, the following will describe the specific structure of the battery module:

[0048] Please refer to Figures 1-5, the battery module 100 of the present utility model includes a box body 1, a battery cell assembly 2, a control assembly 3 and a heat insulation protection cover 4; the box body 1 is provided with a receiving cavity 1a; the battery cell assembly 2, the control assembly 3 and the heat insulation protection cover 4 are sequentially arranged in the receiving cavity 1a along the first direction X; the control assembly 3 includes a heat insulation bracket 31 and a control circuit board 32 electrically connected to the battery cell assembly 2, the heat insulation bracket 31 covers the battery cell assembly 2, the control circuit board 32 is fixed to the side of the heat insulation bracket 31 facing away from the battery cell assembly 2, the heat insulation bracket 31 is provided with a diversion port 311 corresponding to the explosion-proof valve 211 of the battery cell assembly 2, and a diversion wall 312 extends from the periphery of the diversion port 311 in a direction away from the battery cell assembly 2, and an inner wall of the diversion wall 312 encloses a diversion channel communicating with the diversion port 311; the heat insulation protection cover 4 is provided with an opening 41 that cooperates with the diversion wall 312, and one end of the diversion wall 312 away from the battery cell assembly 2 passes through the opening 41; wherein, the electrolyte ejected from the explosion-proof valve 211 of the battery cell assembly 2 can be ejected through the diversion channel to the side of the heat insulation protection cover 4 facing away from the control circuit board 32, and the heat insulation protection cover 4 further shields the control circuit board 32, reducing the possibility of the ejected electrolyte directly contacting the control circuit board 32, thereby reducing the possibility of damage to the control circuit board 32.

[0049] In some embodiments, please refer to Figure 4 , Figure 6 and Figure 7 , a diversion groove 42 is provided on the surface of the heat insulation protection cover 4 facing away from the control circuit board 32. Along the extending direction of the diversion groove 42, both ends of the diversion groove 42 protrude from the battery cell assembly 2, that is, both ends of the diversion groove 42 protrude from the control circuit board 32, so as to divert the electrolyte ejected from the diversion channel outside the battery cell assembly 2 (such as Figure 6As shown by the arrow), this reduces the possibility of the electrolyte converging on the heat insulation shield 4 from corroding the heat insulation shield 4, also reduces the possibility of the electrolyte staying on the heat insulation shield 4 for a long time and transferring heat to the battery cell assembly 2, and reduces the possibility of the electrolyte flowing from both ends of the diversion groove 42 to the control circuit board 32; the diversion groove 42 is arranged at an interval from the opening 41. Preferably, the extending direction of the diversion groove 42 is perpendicular to the first direction X; the diversion groove 42 is formed by the surface of the heat insulation shield 4 facing away from the control circuit board 32 being recessed inward, so that the distance between the bottom of the diversion groove 42 and the bottom of the box body 1 is less than the distance between the opening 41 and the bottom of the box body 1. The electrolyte ejected from the diversion channel can converge at the bottom of the diversion groove 42 and be diverted from the diversion groove 42 to outside the battery cell assembly 2. Preferably, the opening 41 is in close fit with the outer wall of the diversion wall 312, that is, there is almost no gap or a small gap between the opening 41 and the outer wall of the diversion wall 312. For example, the opening 41 and the outer wall of the diversion wall 312 can be in interference fit to reduce the possibility of the electrolyte ejected from the diversion channel flowing to the control circuit board 32 through the gap between the opening 41 and the outer wall of the diversion wall 312. It can be understood that the shape of the opening 41 can be circular, oval, square, and other polygons, and the number of the opening 41 and the diversion groove 42 can be one or more. For example, along the direction perpendicular to the extension of the diversion groove 42, a plurality of diversion grooves 42 are arranged in an array and evenly distributed on the heat insulation shield 4, and a plurality of openings 41 are arranged between two adjacent diversion grooves 42 so that the diversion groove 42 can evenly converge the electrolyte ejected from the diversion wall 312; the shape of the heat insulation shield 4 is preferably square. Of course, it can also be circular, oval, and other polygons.

[0050] In some embodiments, please refer to Figure 5 and Figure 8 , the numbers of both the battery cell assembly 2 and the control assembly 3 are several. Along the extending direction of the diversion groove 42, several battery cell assemblies 2 are evenly arranged in the accommodation cavity 1a. The heat insulation bracket 31 of a control assembly 3 covers a battery cell assembly 2, and the control circuit board 32 of a control assembly 3 is fixed to the side of the heat insulation bracket 31 of a control assembly 3 facing away from the battery cell assembly 2; the number of the openings 41 of the heat insulation shield 4 is several, and one opening 41 cooperates with the diversion wall 312 of the heat insulation bracket 31 of a control assembly 3. The heat insulation shield 4 covers the surfaces of several control assemblies 3 facing away from the battery cell assembly 2. It can be understood that the direction in which several battery cell assemblies 2 are arranged in the accommodation cavity 1a is not limited to the extending direction of the diversion groove 42 and can be other directions. For example, several battery cell assemblies 2 can be evenly arranged in the accommodation cavity 1a along the direction perpendicular to the extension of the diversion groove 42.

[0051] For the above control assembly 3, please refer to Figure 9 , Figure 10 and Figure 11, the control component 3 includes a heat insulation bracket 31, a control circuit board 32, and an isolation cover 33. The heat insulation bracket 31 covers the battery cell component 2; the control circuit board 32 is fixed to the side of the heat insulation bracket 31 facing away from the battery cell component 2. The heat insulation bracket 31 is used to separate the control circuit board 32 from the battery cell component 2 to prevent the electrolyte ejected from the battery cell component 2 from contacting the control circuit board 32. In addition, the heat insulation bracket 31 is also used to provide a supporting function for the control circuit board 32; preferably, the heat insulation bracket 31 is adhesively bonded to the top of the battery cell component 2, and the material of the heat insulation bracket 31 includes aluminum to have better supporting strength; the material of the heat insulation bracket 31 also includes insulating and heat-insulating materials such as glass fiber, carbon fiber, or ceramic to have better insulation and heat insulation effects. The control circuit board 32 is electrically connected to the battery cell component 2, and the control circuit board 32 is used to control the charging and discharging of the battery cell component 2; the isolation cover 33 is fixed to one end of the diversion wall 312 of the heat insulation bracket 31 away from the battery cell component 2 to cover the diversion channel 313. In this way, the isolation cover 33 can block the electrolyte outside the diversion channel 313 from entering the diversion channel 313, that is, it can reduce the possibility of the ejected electrolyte flowing back into the battery cell component 2 from the diversion channel 313. The isolation cover 33 can be adhesively bonded and fixed to one end of the diversion wall 312 away from the battery cell component 2; further, the surface of the isolation cover 33 is recessed with an indentation groove 331, so that the thickness of the isolation cover 33 at the indentation groove 331 is smaller than the thickness of the isolation cover 33 outside the indentation groove 331. The indentation groove 331 is annularly distributed on the surface of the isolation cover 33. In this way, when the pressure in the diversion channel 313 reaches a predetermined threshold, a part of the isolation cover 33 will tear open towards the outside of the diversion channel 313 along the indentation groove 331, that is, when the pressure in the diversion channel 313 is relatively large, it can instantly break through the isolation cover 33, while the pressure from the outside to the inside of the diversion channel 313 cannot reach this value and cannot open the isolation cover 33 from the outside to the inside, so as to realize that the electrolyte can erupt from the diversion channel 313, but the ejected electrolyte is difficult to pour into other diversion channels 313, thus realizing the function of one-way isolation. Preferably, the isolation cover 33 is a metal sheet, and the indentation groove 331 is close to the periphery of the isolation cover 33 and is arranged around the periphery of the isolation cover 33. It can be understood that the shape of the isolation cover 33 can be circular, elliptical, square, and other polygons; along the width / length direction of the isolation cover 33, the cross-section of the indentation groove 331 is V-shaped. In this way, the thickness of the isolation cover 33 at the bottom of the indentation groove 331 is the smallest, and the isolation cover 33 is more likely to tear open from the inside of the diversion channel 313 along the indentation groove 331 to the outside.

[0052] For the above-mentioned box body 1, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 12, the box body 1 includes a liquid cooling plate 11 and a top cover 12. The top cover 12 is covered on the liquid cooling plate 11 along the first direction X to enclose a receiving cavity 1a. The top cover 12 is provided with an external explosion-proof valve 121. Among them, the gas in the receiving cavity 1a can be discharged from the external explosion-proof valve 121 to the outside of the receiving cavity 1a, so as to reduce the possibility of explosion of the gas in the receiving cavity 1a due to excessive pressure. In some embodiments, the box body 1 includes a fixing member (not shown in the figure). The top cover 12 is detachably fixed to the liquid cooling plate 11 through the fixing member. For example, the fixing member is a bolt. The top cover 12 is provided with a through hole (not shown in the figure). After the fixing member passes through the through hole, it is screwed to the liquid cooling plate 11 to fix the top cover 12 to the liquid cooling plate 11. The battery cell assembly 2 is arranged on the liquid cooling plate 11. The liquid cooling plate 11 is provided with a liquid inlet 111, a liquid cooling channel (not shown in the figure) and a liquid outlet 112 that are connected in sequence. In this way, the coolant can flow into the liquid cooling channel in the liquid cooling plate 11 from the liquid inlet 111 and flow out from the liquid outlet 112 to provide a circulating cooling effect for the battery cell assembly 2 and thus achieve rapid cooling. The electrolyte flowing to the liquid cooling plate 11 can also be cooled by the liquid cooling plate 11 to relieve the heat spread caused by thermal runaway.

[0053] In some embodiments, please refer to Figure 13 , the battery module 100 includes two partition fences 5 arranged in the receiving cavity 1a. Along the extending direction of the diversion groove 42, the two partition fences 5 are respectively located on both sides of one end of the battery cell assembly 2 away from the heat insulation protection cover 4 to block the electrolyte flowing out from both ends of the diversion groove 42 and reduce the possibility of it flowing to the battery cell assembly 2. The partition fence 5 includes a partition part 52 and a fixing part 51 that are bent and connected to each other. The side wall of the fixing part 51 is fixed to the bottom wall of the receiving cavity 1a. Specifically, the side wall of the fixing part 51 is fixed to the surface of the liquid cooling plate 11 facing the battery cell assembly 2. The side wall of the partition part 52 faces the battery cell assembly 2 to better prevent the electrolyte flowing down from both ends of the diversion groove 42 from flowing to the battery cell assembly 2. Preferably, along the direction perpendicular to the extension of the diversion groove 42, the partition fence 5 is L-shaped, and both ends of the partition fence 5 protrude beyond the battery cell assembly 2 to better prevent the electrolyte from flowing to the battery cell assembly 2.

[0054] In some embodiments, the battery module 100 includes two positioning rods 6 fixed to the bottom wall of the receiving cavity 1a. Specifically, the positioning rods 6 are fixed to the surface of the liquid cooling plate 11 facing the battery cell assembly 2. The two positioning rods 6 and the two partition bars 5 jointly enclose a receiving groove 7, and the battery cell assembly 2 is arranged in the receiving groove 7 to facilitate the positioning and installation of the battery cell assembly 2. The positioning rods 6 can also prevent the electrolyte flowing down from both ends of the diversion groove 42 from flowing towards the battery cell assembly 2. It can be understood that the positioning rods 6 can be integrally provided with the liquid cooling plate 11, that is, the surface of the liquid cooling plate 11 facing the battery cell assembly 2 protrudes to form the positioning rods 6. In this way, the number of components can be reduced, thereby reducing the manufacturing cost. In some embodiments, the battery cell assembly 2 can be fixed to the positioning rods 6 so that there is a gap between the battery cell assembly 2 and the surface of the liquid cooling plate 11 facing the battery cell assembly 2, so as to further prevent the electrolyte on the surface of the liquid cooling plate 11 facing the battery cell assembly 2 from contacting the battery cell assembly 2.

[0055] For the above battery cell assembly 2, please refer to Figure 2 、 Figure 14 and Figure 15 : The battery cell assembly 2 includes a plurality of battery cells 21 stacked in sequence. An explosion-proof valve 211 is provided at the top of each battery cell 21, and each battery cell 21 is electrically connected to the control circuit board 32; an aerogel 22 is provided between any two adjacent battery cells 21. The aerogel 22 is used for heat insulation to relieve the thermal runaway of the battery cells 21. Preferably, the opposite two surfaces of the aerogel 22 are adhesively bonded between two adjacent battery cells 21 to prevent the electrolyte from penetrating between two adjacent battery cells 21 after thermal runaway; end plates 24 are respectively provided at the head and tail ends after the plurality of battery cells 21 are stacked in sequence. The end plates 24 are used to fix the stacked battery cells 21 in sequence. In addition, the battery cell assembly 2 can be fixed to the liquid cooling plate 11 through the end plates 24. In the present application, the battery cell assembly 2 is fixed to the positioning rods 6 on the liquid cooling plate 11 through the end plates 24. The end plates 24 can be made of a metal material to have better strength; an insulating sheet 23 is provided between the end plates 24 and the battery cells 21. The insulating sheet 23 is used to insulate the battery cells 21 and the end plates 24. The material of the insulating sheet 23 is an insulating and heat-insulating material, such as glass fiber, carbon fiber or ceramic, to have better insulation and heat-insulating effects; a tie strap 25 is wound around the outside of the end plates 24 and the plurality of stacked battery cells 21 in sequence to further package and fix the stacked battery cells 21 and the end plates 24. The tie strap 25 is preferably a steel strip to provide a strong fastening force.

[0056] The electrolyte ejected from the explosion-proof valve 211 of the battery cell assembly 2 of the battery module 100 according to the embodiment of the present utility model can be ejected to the side of the heat insulation protection cover 4 away from the control circuit board 32 through the diversion channel. The heat insulation protection cover 4 further shields the control circuit board 32, reducing the possibility that the ejected electrolyte directly contacts the control circuit board 32, thereby reducing the possibility of damage to the control circuit board 32. In addition, through the diversion groove 42 of the heat insulation protection cover 4, the electrolyte on the side of the heat insulation protection cover 4 away from the control circuit board 32 can be diverted outside the battery cell assembly 2. By arranging the isolation bars 5 on both sides of the end of the battery cell assembly 2 away from the heat insulation protection cover 4, the possibility that the electrolyte flowing down from both ends of the diversion groove 42 flows to the battery cell assembly 2 can be prevented. By arranging the battery cell assembly 2 and the isolation bars 5 on the liquid cooling plate 11, the battery cell assembly 2 and the electrolyte flowing to the liquid cooling plate 11 can be quickly cooled down to slow down the heat spread caused by thermal runaway.

[0057] The present utility model further provides an embodiment of an electrical device. The electrical device includes the above-mentioned battery module 100. For the functions and structures of the battery module 100, reference can be made to the above embodiments, and details are not described herein again.

[0058] It should be noted that the present utility model provides the preferred embodiments in the description and drawings of the present utility model. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations to the content of the present utility model. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Moreover, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as within the scope described in the description of the present utility model. Further, for those of ordinary skill in the art, improvements or modifications can be made according to the above description, and all such improvements and modifications should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A battery module, characterized in that, Comprising: a box body, a battery cell assembly, a control assembly, and a heat insulation protection cover; The box body is provided with a receiving cavity; The battery cell assembly, the control assembly, and the heat insulation protection cover are sequentially arranged in the receiving cavity along a first direction; The control assembly includes a heat insulation bracket and a control circuit board electrically connected to the battery cell assembly. The heat insulation bracket covers the battery cell assembly, the control circuit board is fixed to a side of the heat insulation bracket facing away from the battery cell assembly, the heat insulation bracket is provided with a diversion port corresponding to an explosion-proof valve of the battery cell assembly, and a diversion wall extends in a direction away from the battery cell assembly at a periphery of the diversion port. An inner wall of the diversion wall encloses a diversion channel communicating with the diversion port; The heat insulation protection cover is provided with an opening matching with the diversion wall, and one end of the diversion wall away from the battery cell assembly passes through the opening; Wherein, electrolyte ejected from the explosion-proof valve of the battery cell assembly can be ejected to a side of the heat insulation protection cover facing away from the control circuit board through the diversion channel.

2. The battery module according to claim 1, wherein The control assembly further includes an isolation cover, and the isolation cover is arranged at an end of the diversion wall away from the battery cell assembly to cover the diversion channel; A stamping groove is recessed on a surface of the isolation cover, so that a thickness of the isolation cover at the stamping groove is less than a thickness of the isolation cover outside the stamping groove, and the stamping groove is annularly distributed on the surface of the isolation cover.

3. The battery module according to claim 1, wherein A diversion groove is arranged on a surface of the heat insulation protection cover facing away from the control circuit board; along an extending direction of the diversion groove, both ends of the diversion groove protrude from the battery cell assembly; the diversion groove and the opening are arranged at intervals.

4. The battery module according to claim 3, wherein The battery module includes two isolation bars arranged in the receiving cavity; along the extending direction of the diversion groove, the two isolation bars are respectively located on two sides of an end of the battery cell assembly away from the heat insulation protection cover; Each isolation bar includes an isolation part and a fixing part which are bent and connected to each other. A side wall of the fixing part is fixed to a bottom wall of the receiving cavity, and a side wall of the isolation part faces the battery cell assembly.

5. The battery module according to claim 4, wherein The battery module includes two positioning rods fixed to a bottom wall of the receiving cavity. The two positioning rods and the two isolation bars jointly enclose a receiving groove, and the battery cell assembly is arranged in the receiving groove.

6. The battery module according to claim 1, wherein The box body includes a liquid cooling plate and a top cover. The top cover is covered on the liquid cooling plate along the first direction to enclose and form the receiving cavity; The battery cell assembly is arranged on the liquid cooling plate, and the liquid cooling plate is provided with a liquid inlet, a liquid cooling channel, and a liquid outlet which are sequentially communicated.

7. The battery module according to claim 6, wherein The top cover is provided with an external explosion-proof valve, and gas in the receiving cavity can be discharged to the outside of the receiving cavity through the external explosion-proof valve.

8. The battery module according to any one of claims 1-7, wherein The battery cell assembly includes a plurality of battery cells stacked in sequence. An aerogel is disposed between any two adjacent battery cells. End plates are respectively disposed at the head and tail ends after the plurality of battery cells are stacked in sequence. An insulating sheet is disposed between the end plate and the battery cell. A cable tie is wound around the outside of the end plate and the plurality of battery cells stacked in sequence.

9. The battery module according to any one of claims 1-7, wherein The number of the battery cell assemblies and the control assemblies is each a plurality. The plurality of battery cell assemblies are uniformly arranged in the accommodation cavity. The heat insulation bracket of a control assembly covers a battery cell assembly, and the control circuit board of a control assembly is fixed to the side of the heat insulation bracket of a control assembly facing away from the battery cell assembly; The number of openings of the heat insulation protection cover is a plurality. One opening is matched with the diversion wall of the heat insulation bracket of a control assembly.

10. An electrical device, characterized in that, It includes the battery module according to any one of claims 1-9.

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