Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, and relates to the technical field of new energy. The battery module comprises a plurality of battery cells and a liquid cooling system, the liquid cooling system comprises a bottom cooling plate and a side cooling plate which are communicated with each other, the top surface of the bottom cooling plate is attached to the bottom surfaces of the battery cells, and the side cooling plate is of an integrated structure with a plurality of bent structures, so that a plurality of accommodating grooves which are sequentially formed in the first direction are formed through the bent structures; the opening directions of the multiple containing grooves are the same, the multiple battery cells and the multiple containing grooves are arranged in a one-to-one correspondence mode, and the battery cells are placed in the containing grooves so that the peripheral side faces of the containing grooves can be attached to the peripheral side faces of the battery cells. According to the battery module and the battery pack, the problem of thermal runaway risk caused by improvement of the charging rate of a lithium battery in the prior art can be solved, and the heat dissipation capability of the battery module is improved by increasing the cooling area of the battery module, so that the use safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a battery module and a battery pack. Background Art

[0002] With the development of the new energy industry, more and more vehicles are beginning to use lithium batteries as power sources. Compared with traditional fuel systems, although lithium batteries have cost advantages during use, they also have defects such as long charging time and insufficient cruising range, which are technical problems that the industry urgently needs to solve.

[0003] In order to solve the above problems, many manufacturers continue to increase the charging rate of lithium batteries to shorten the charging time. This method will cause the temperature of the battery cell to rise rapidly during the charging process. If there is no reasonable thermal management system involved, it is easy to cause thermal runaway, which will bring certain safety hazards.

[0004] At present, most of the design solutions in the industry are to add a liquid cooling plate at the bottom of the battery module. Since a single square battery cell has six sides, each side will accumulate a certain amount of heat during operation. Simply cooling at the bottom of the battery module will have a very limited cooling effect. Utility Model Content

[0005] The purpose of the utility model is to provide a battery module and a battery pack, which can solve the problem in the prior art that lithium batteries have a risk of thermal runaway due to increasing the charging rate, and improve the heat dissipation capacity of the battery module by increasing the cooling area of ​​the battery module, thereby improving the safety of the battery pack.

[0006] The embodiment of the utility model is achieved as follows:

[0007] The first aspect of the embodiment of the utility model provides a battery module, including multiple battery cells and a liquid cooling system, wherein the liquid cooling system includes a bottom cold plate and a side cold plate that are interconnected, wherein the top surface of the bottom cold plate is arranged in abutment with the bottom surface of the battery cell, and the side cold plate is an integrated structure having multiple bending structures, so that multiple receiving grooves arranged in sequence along a first direction are formed by the bending structures, and the opening directions of the multiple receiving grooves are the same, and the multiple battery cells are arranged in a one-to-one correspondence with the multiple receiving grooves, and the battery cells are placed in the receiving grooves so that the peripheral side surfaces of the receiving grooves are arranged in abutment with the peripheral side surfaces of the battery cells. The battery module can solve the problem of thermal runaway risk of lithium batteries due to increased charging rate in the prior art, and improve the heat dissipation capacity of the battery module by increasing the cooling area of ​​the battery module, thereby improving the safety of the battery pack.

[0008] As an implementation method, each of the bending structures includes a folding portion, an end face portion and a side portion connected in sequence, the folding portion and the side portion are arranged opposite to each other, the end face portions of two adjacent bending structures are arranged opposite to each other, and the folding portions of two adjacent bending structures are arranged alternately, so that the folding portion, the end face portion and the side portion of any one of the bending structures and the end face portions of adjacent bending structures together form the peripheral side surface of the accommodating groove.

[0009] As an implementation method, a buffer is provided on a side of the side portion of any bending structure away from its folding portion, and the side of the buffer away from the side portion is flush with the side of the folding portion of an adjacent bending structure away from its side portion.

[0010] As an implementation method, a water inlet and a water outlet are provided on the bottom cold plate, a first flow channel is provided in the bottom cold plate, a second flow channel is provided in the side cold plate, and the water inlet, the first flow channel and the second flow channel are connected through a three-way valve.

[0011] As an implementation method, a branch channel is provided in the side cold plate, and the branch channel extends along a second direction perpendicular to the first direction. There are multiple second flow channels, and the multiple second flow channels are arranged at intervals and are all connected to the branch channel.

[0012] As an implementation method, the cavity areas of the plurality of second flow channels gradually decrease from a side away from the bottom cold plate to a side close to the bottom cold plate.

[0013] As an implementable embodiment, the liquid cooling system further includes a controller, wherein the controller is electrically connected to the three-way valve and is used to control the on-off of the three-way valve.

[0014] As an implementation method, it also includes two end plates and a restraining member, the two end plates are respectively arranged at the opposite ends of the multiple battery cells, the inner sides of the two end plates are respectively fitted with two bending structures located at the opposite ends of the multiple battery cells, and the restraining member is arranged around the multiple battery cells and the two end plates to form the surrounding side surface of the entire module.

[0015] As an implementation method, it also includes an I-shaped pressure plate and a plurality of connecting rows, each of the battery cells is provided with two poles on the top surface, the poles of two adjacent battery cells are connected through the connecting row, the opposite ends of the I-shaped pressure plate are respectively fixedly connected to the top surfaces of the two end plates, and the I-shaped pressure plate is provided with avoidance holes corresponding to the connecting rows.

[0016] The second aspect of the embodiment of the utility model provides a battery pack, comprising the above-mentioned battery module. The battery module can solve the problem of thermal runaway risk of lithium batteries due to increased charging rate in the prior art, and improve the heat dissipation capacity of the battery module by increasing the cooling area of ​​the battery module, thereby improving the safety of the battery pack.

[0017] The beneficial effects of the embodiments of the utility model include:

[0018] The battery module includes a plurality of battery cells and a liquid cooling system, the liquid cooling system includes a bottom cold plate and a side cold plate that are interconnected, the top surface of the bottom cold plate is arranged in abutment with the bottom surface of the battery cell, the side cold plate is an integrated structure with a plurality of bending structures, so that a plurality of receiving grooves arranged in sequence along a first direction are formed by the bending structures, the opening directions of the plurality of receiving grooves are the same, a plurality of battery cells are arranged in a one-to-one correspondence with the plurality of receiving grooves, and the battery cells are placed in the receiving grooves so that the peripheral side surfaces of the receiving grooves are arranged in abutment with the peripheral side surfaces of the battery cells. Compared with the heat dissipation method provided in the prior art, which can only cool the bottom surface of the battery cell, the battery module provided in the present application, on the basis of the bottom cold plate, is further provided with a side cold plate with a plurality of bending structures, so that a plurality of receiving grooves are formed by a plurality of bending structures, so that a plurality of battery cells are placed in a one-to-one correspondence in the plurality of receiving grooves, not only forming a layout scheme in which a plurality of battery cells are arranged in sequence along the first direction, but also significantly increasing the cooling area of ​​the liquid cooling system for cooling the battery cells (increased from one surface to five surfaces), thereby improving the heat dissipation capacity of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a battery module provided by an embodiment of the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged view of

[0022] Figure 3 One of the structural schematic diagrams of the side cooling plate provided in the embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the structure of a bottom cold plate provided in an embodiment of the utility model;

[0024] Figure 5The second structural schematic diagram of the side cooling plate provided in the embodiment of the utility model.

[0025] Icons: 100-battery module; 10-battery cell; 21-bottom cold plate; 211-water inlet; 212-water outlet; 213-first flow channel; 214-three-way valve; 22-side cold plate; 221-folding part; 222-end face part; 223-side face part; 224-diverter channel; 225-second flow channel; 23-receiving groove; 24-sealing plate; 30-end plate; 40-binding member; 50-X-shaped pressure plate; 60-connecting row; 70-output row; 71-mounting frame; a-first direction; b-second direction. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Please refer to Figures 1 to 5 The embodiment of the present application provides a battery module 100, including a plurality of battery cells 10 and a liquid cooling system, wherein the liquid cooling system includes a bottom cold plate 21 and a side cold plate 22 which are interconnected, wherein the top surface of the bottom cold plate 21 is arranged in abutment with the bottom surface of the battery cell 10, and the side cold plate 22 is an integrated structure having a plurality of bending structures, so that a plurality of receiving grooves 23 arranged in sequence along a first direction a are formed by the bending structures, and the opening directions of the plurality of receiving grooves 23 are the same, and the plurality of battery cells 10 are arranged in a one-to-one correspondence with the plurality of receiving grooves 23, and the battery cells 10 are placed in the receiving grooves 23 so that the peripheral side surfaces of the receiving grooves 23 are arranged in abutment with the peripheral side surfaces of the battery cells 10. The battery module 100 can solve the problem in the prior art that the lithium battery has a risk of thermal runaway due to the increase in the charging rate, and by increasing the cooling area of ​​the battery module 100, the heat dissipation capacity of the battery module 100 is improved, thereby improving the safety of the battery pack.

[0033] It should be noted that if Figure 1 and Figure 2 As shown, the battery module 100 includes a plurality of battery cells 10, so that the battery module 100 is formed by connecting the plurality of battery cells 10 in series and in parallel. As for the implementation of the series and parallel connection between the plurality of battery cells 10, the electrical connection between two adjacent battery cells 10 can be realized by a tab or the like, and those skilled in the art should be able to make reasonable selections and designs according to actual conditions, and no specific limitation is made here.

[0034] like Figure 1 and Figure 2 As shown, the battery cell 10 is a square structure with six faces, namely, a bottom face, a top face, two side faces (or small faces) and two end faces (or large faces). Currently, a liquid cooling plate is added to the bottom of the battery cell 10 to cool the bottom of the battery cell 10. However, in the actual working process, each face of the battery cell 10 will accumulate a certain amount of heat, so there is a problem of poor cooling effect.

[0035] In order to solve the above problems, Figure 1 and Figure 2 As shown, the liquid cooling system provided by the present application includes a bottom cold plate 21 and a side cold plate 22 that are interconnected, so that a cooling channel for the circulation of coolant is formed by the bottom cold plate 21 and the side cold plate 22. Among them, the same as the prior art is that the bottom cold plate 21 is fixedly arranged at the bottom of the battery cell 10, so that the top surface of the bottom cold plate 21 is arranged in abutment with the bottom surface of the battery cell 10; different from the prior art is that the side cold plate 22 is an integrated structure with multiple bending structures, so that multiple receiving grooves 23 arranged in sequence along the first direction a are formed by multiple bending structures, and the opening directions of the multiple receiving grooves 23 are the same, and the multiple battery cells 10 are arranged one by one with the multiple receiving grooves 23, so that the battery cell 10 is placed in the receiving groove 23 through the opening, and when the battery cell 10 is placed in the receiving groove 23, the peripheral side surface of the receiving groove 23 is arranged in abutment with the peripheral side surface of the battery cell 10.

[0036] In the actual manufacturing process, the side cold plate 22 is made by an integrated molding process, and the actual size of the receiving groove 23 should be designed according to the actual size of the battery cell 10, and the receiving groove 23 formed by the bending structure only needs to be able to accommodate the battery cell 10. In this way, the bottom surface of the battery cell 10 can be cooled by the bottom cold plate 21, and the peripheral side surfaces (including two side surfaces and two end surfaces) of the battery cell 10 can be cooled by the side cold plate 22, thereby realizing the cooling of the five surfaces of the battery cell 10 (i.e., the bottom surface, two side surfaces and two end surfaces).

[0037] Compared with the heat dissipation method provided in the prior art, which can only cool the bottom surface of the battery cell 10, the battery module 100 provided in the present application, on the basis of the bottom cold plate 21, is further provided with a side cold plate 22 with multiple bending structures, so as to form multiple accommodating grooves 23 through multiple bending structures, so that multiple battery cells 10 can be placed in the multiple accommodating grooves 23 one by one, which not only forms a layout scheme in which multiple battery cells 10 are arranged in sequence along the first direction a, but also can significantly increase the cooling area of ​​the liquid cooling system for cooling the battery cell 10 (from the original one surface to five surfaces), thereby improving the heat dissipation capacity of the battery module 100.

[0038] As an implementation method, Figure 3As shown, each bending structure includes a folding portion 221, an end portion 222 and a side portion 223 which are connected in sequence, and the folding portion 221 and the side portion 223 are arranged relative to each other so as to cool the two side surfaces of the battery cell 10 respectively through the folding portion 221 and the side portion 223 of the same bending structure, and the end portions 222 of two adjacent bending structures are arranged relative to each other so as to cool the two end surfaces of the battery cell 10 respectively through the end portions 222 of two adjacent bending structures, and the folding portions 221 of two adjacent bending structures are arranged in an alternating manner so as to facilitate the reversal of the two adjacent bending structures during layout design, so that the folding portion 221, the end portion 222 and the side portion 223 of any bending structure and the end portion 222 of the adjacent bending structure jointly form the peripheral side surface of the accommodating groove 23.

[0039] As an implementation method, Figure 3 As shown, a plurality of bending structures are connected in sequence to form a plurality of accommodating grooves 23, and a side surface portion 223 of the last bending structure is provided with a sealing plate 24, and the sealing plate 24 and the end surface portion 222 of the last bending structure are arranged opposite to each other so that the sealing plate 24 closes the accommodating groove 23, thereby cooling the two end surfaces of the battery cell 10 placed therein respectively through the sealing plate 24 and the end surface portion 222 of the last bending structure.

[0040] As an implementation method, Figures 1 to 3 As shown, a side of the side portion 223 of any bending structure away from its folding portion 221 is provided with a buffer (not shown in the figure), and the side of the buffer away from the side portion 223 is flush with the side of the folding portion 221 of the adjacent bending structure away from its side portion 223, thereby ensuring that under the action of the buffer, the surfaces of the battery module 100 on two opposite sides along the first direction a are flush. For example, in this embodiment, the buffer can be a buffer pad, a buffer glue, a buffer foam, etc.

[0041] As an implementation method, Figure 4 and Figure 5 As shown, the bottom cold plate 21 is provided with a water inlet 211 and a water outlet 212, and a first flow channel 213 is provided in the bottom cold plate 21, and a second flow channel 225 is provided in the side cold plate 22. The water inlet 211, the first flow channel 213 and the second flow channel 225 are connected through a three-way valve 214. In this way, the coolant entering the cooling flow channel through the water inlet 211 can be diverted to the first flow channel 213 and the second flow channel 225 under the action of the three-way valve 214, thereby ensuring that the bottom cold plate 21 and the side cold plate 22 can work normally, and finally converge to the water outlet 212 through the three-way valve 214.

[0042] The first flow channel 213 and the second flow channel 225 provided in the above solution are both S-shaped, which may easily lead to uneven heat dissipation of the battery cell 10 near the water inlet 211 and the battery cell 10 far from the water inlet 211. In order to solve this problem, as an implementation method, please refer to Figures 3 to 5 , a branch channel 224 is provided in the side cold plate 22, and the branch channel 224 extends along a second direction b perpendicular to the first direction a, and there are multiple second channels 225, and the multiple second channels 225 are arranged at intervals and are all connected to the branch channel 224. In this way, the coolant entering the cooling channel through the water inlet 211 can be firstly divided into the first channel 213 and the branch channel 224 under the action of the three-way valve 214, and then divided into the multiple second channels 225 through the branch channel 224, so as to improve the uniformity of heat dissipation.

[0043] In order to further improve the uniformity of heat dissipation, as an implementation method, Figure 5 As shown, the cavity area of ​​the multiple second flow channels 225 gradually decreases from the side away from the bottom cold plate 21 to the side close to the bottom cold plate 21. In this way, the difference in the flow rate of the coolant in the multiple second flow channels 225 can be ensured by controlling the cavity area of ​​the second flow channels 225. Since the coolant is subjected to greater pressure and greater resistance the farther away from the bottom cold plate 21, the cavity area of ​​the second flow channel 225 is greater the farther away from the bottom cold plate 21, which can reduce the flow resistance of the coolant, thereby ensuring the uniformity of heat dissipation of the multiple second flow channels 225 of the entire side cold plate 22.

[0044] In order to improve the intelligence of the liquid cooling system, as an implementable embodiment, the liquid cooling system also includes a controller (not shown in the figure), which is electrically connected to the three-way valve 214 and is used to control the on and off of the three-way valve 214. When the battery module 100 is in a low power consumption state, the heat dissipation demand of the battery cell 10 can be met only by the bottom cold plate 21. At this time, the valve between the three-way valve 214 and the side cold plate 22 can be closed by the controller, so that the connection between the three-way valve 214 and the second flow channel 225 (or the branch flow channel 224) is disconnected, and the side cold plate 22 is put into a standby state; when the battery module 100 is in a high power consumption state, the heat dissipation demand of the battery cell 10 can no longer be met only by the bottom cold plate 21. At this time, the valve between the three-way valve 214 and the side cold plate 22 can be opened by the controller, so that the connection with the second flow channel 225 (or the branch flow channel 224) is reconnected, and the side cold plate 22 is put into a working state.

[0045] As an implementation method, Figure 1 and Figure 2As shown, the battery module 100 also includes two end plates 30 and a restraining member 40, the two end plates 30 are respectively arranged at the opposite ends of the plurality of battery cells 10, and the inner side surfaces of the two end plates 30 are respectively arranged in affixed with the two bending structures located at the opposite ends of the plurality of battery cells 10, so as to restrain the plurality of battery cells 10 and the side cold plate 22 in the first direction a through the two end plates 30, and the restraining member 40 is arranged around the peripheral side surface of the module as a whole formed by the plurality of battery cells 10 and the two end plates 30, so as to restrain the module as a whole formed by the plurality of battery cells 10, the side cold plate 22 and the two end plates 30 in the circumferential direction through the restraining member 40. Among them, the restraining member 40 can be an elastic band, a plastic steel band, etc., which is not specifically limited here. For example, in this embodiment, the number of restraining members 40 is two, and the two restraining members 40 are arranged at intervals along the second direction b, one of the restraining members 40 is close to the top surface of the battery cell 10, and the other restraining member 40 is close to the bottom surface of the battery cell 10, so as to further improve the restraining effect.

[0046] As an implementation method, Figure 1 and Figure 2 As shown, the battery module 100 also includes a "J"-shaped pressing plate 50 and a plurality of connecting rows 60. Two poles are arranged on the top surface of each battery cell 10. The poles of two adjacent battery cells 10 are connected through the connecting row 60 so that the plurality of battery cells 10 can be connected in series. The opposite ends of the "J"-shaped pressing plate 50 are respectively fixedly connected to the top surfaces of the two end plates 30, so that the plurality of battery cells 10 can be constrained in the second direction b by the "J"-shaped pressing plate 50 in cooperation with the bottom cold plate 21. The "J"-shaped pressing plate 50 is provided with avoidance holes corresponding to the connecting row 60 to avoid interference with the connection between the poles and the connecting row 60. In addition, the battery module 100 also includes two output rows 70. One of the poles of two battery cells 10 located at the opposite ends of the plurality of battery cells 10 is connected to the output row 70 so as to connect the battery module 100 to the power circuit. The output row 70 can be fixed on the end plate 30 through the mounting frame 71.

[0047] The embodiment of the present application further provides a battery pack, comprising the above-mentioned battery module 100. Since the structure and beneficial effects of the battery module 100 have been described in detail in the above-mentioned embodiment, they will not be described again here.

[0048] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery module, characterized in that: It includes multiple battery cells and a liquid cooling system, the liquid cooling system includes a bottom cold plate and a side cold plate which are interconnected, the top surface of the bottom cold plate is fitted with the bottom surface of the battery cell, the side cold plate is an integrated structure with multiple bending structures, so that multiple accommodating grooves arranged in sequence along a first direction are formed by the bending structures, the opening directions of the multiple accommodating grooves are the same, the multiple battery cells are arranged in a one-to-one correspondence with the multiple accommodating grooves, and the battery cells are placed in the accommodating grooves so that the peripheral side surfaces of the accommodating grooves are fitted with the peripheral side surfaces of the battery cells.

2. The battery module according to claim 1, characterized in that: Each of the bending structures includes a folding portion, an end face portion and a side face portion connected in sequence, the folding portion and the side face portion are arranged opposite to each other, the end face portions of two adjacent bending structures are arranged opposite to each other, and the folding portions of two adjacent bending structures are arranged alternately, so that the folding portion, the end face portion and the side face portion of any one of the bending structures and the end face portions of adjacent bending structures together form the peripheral side surface of the accommodating groove.

3. The battery module according to claim 2, characterized in that: A buffer is provided on one side of the side portion of any bending structure away from its folding portion, and the side of the buffer away from the side portion is flush with the side of the folding portion of the adjacent bending structure away from its side portion.

4. The battery module according to claim 1, characterized in that: The bottom cold plate is provided with a water inlet and a water outlet, and a first flow channel is provided in the bottom cold plate, and a second flow channel is provided in the side cold plate. The water inlet, the first flow channel and the second flow channel are connected through a three-way valve.

5. The battery module according to claim 4, characterized in that: A shunt channel is arranged in the side cold plate, and the shunt channel extends along a second direction perpendicular to the first direction. There are a plurality of second flow channels, and the plurality of second flow channels are arranged at intervals and are all connected to the shunt channel.

6. The battery module according to claim 5, characterized in that: The cavity areas of the plurality of second flow channels gradually decrease from a side away from the bottom cold plate to a side close to the bottom cold plate.

7. The battery module according to claim 4, characterized in that: The liquid cooling system further comprises a controller, which is electrically connected to the three-way valve and is used for controlling the on-off of the three-way valve.

8. The battery module according to claim 1, characterized in that: It also includes two end plates and a restraining member, the two end plates are respectively arranged at the opposite ends of the plurality of battery cells, the inner sides of the two end plates are respectively fitted with two bending structures located at the opposite ends of the plurality of battery cells, and the restraining member is arranged around the plurality of battery cells and the two end plates to form the surrounding side surface of the entire module.

9. The battery module according to claim 8, characterized in that: It also includes an I-shaped pressure plate and a plurality of connection rows, wherein two poles are arranged on the top surface of each battery cell, and the poles of two adjacent battery cells are connected through the connection row, and the opposite ends of the I-shaped pressure plate are respectively fixedly connected to the top surfaces of the two end plates, and the I-shaped pressure plate is provided with avoidance holes corresponding to the connection rows.

10. A battery pack, characterized in that: A battery module comprising any one of claims 1 to 9.

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