Battery module and battery pack

Abstract

The utility model relates to a battery module. The battery module comprises a battery assembly, an end plate, a first insulating sheet, a side plate and a second insulating sheet, and the first insulating sheet and the second insulating sheet can insulate and isolate the battery assembly along two different directions respectively. Moreover, the first folding edge of the first insulating sheet can wrap at least part of the edge of the end plate, so that the distance between the edge of the end plate and the battery assembly is farther, and the creepage distance and the electric gap between the end plate and the battery assembly can be increased. Therefore, in the use process of the battery module, the probability that the first insulating sheet is electrified due to electric polarization can be effectively reduced, so that the insulation failure of the first insulating sheet is effectively prevented. Therefore, the insulating property of the battery module is improved. In addition, the utility model further provides a battery pack.

Description

Technical Field

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

[0002] With the development of electric vehicles and energy storage technologies, the requirements for battery safety are also getting higher and higher. Insulation failure inside the battery is an important factor causing safety hazards such as thermal runaway, so the insulation arrangement inside the battery is particularly important. At present, general battery modules only perform surface insulation between the end plates and the batteries, between the batteries and the side plates, and between the batteries and the liquid cooling plates. Due to the compact structure inside the battery module, the thickness of the insulation parts is usually small, resulting in easy occurrence of creepage phenomenon. After the battery module undergoes multiple cycles, insulation failure problems are likely to occur. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a battery module that can improve insulation performance in view of the above problems.

[0004] A battery module includes a battery assembly, end plates arranged on both sides in the length direction of the battery assembly, first insulating sheets arranged between the end plates and the battery assembly, side plates arranged on both sides in the width direction of the battery assembly, and second insulating sheets arranged between the side plates and the battery assembly. A first folded edge protruding towards the end plate is formed at the edge of the first insulating sheet, and the first folded edge covers at least part of the edge on the side of the end plate facing the battery assembly.

[0005] In one embodiment, a sinking step is formed along the edge of each end plate on the side facing the battery assembly, and the first folded edge extends into the sinking step.

[0006] In one embodiment, the sinking steps are formed at the edges of three sides of the end plate except the top, and the first folded edges are formed at the edges of three sides of the first insulating sheet opposite to the sinking steps. The height of the first insulating sheet is greater than or equal to the heights of the end plate and the battery assembly.

[0007] In one embodiment, first bending parts protruding towards the battery assembly are formed at the edges of both ends in the length direction of each side plate, and the first bending parts at both ends of the side plate are respectively attached to and connected with the side of the end plate facing away from the battery assembly.

[0008] In one embodiment, second bending parts protruding towards the battery assembly are formed at the bottom edge of each side plate, and the second bending parts support the bottom of the battery assembly.

[0009] In one embodiment, it further includes a third insulating sheet disposed at the bottom of the battery assembly. Both ends of the third insulating sheet in the width direction extend to within the range of the second bending portions on both sides of the battery assembly and are in contact with the inner sides of the second bending portions.

[0010] In one embodiment, both ends of the second insulating sheet in the length direction extend to contact the first folded edges of the first insulating sheets on both sides, both ends of the third insulating sheet in the length direction extend to contact the first folded edges of the first insulating sheets on both sides, and both ends of the third insulating sheet in the width direction extend to contact the second insulating sheets on both sides.

[0011] In one embodiment, the side plate is provided with an extension piece protruding beyond the height range of the battery assembly in the height direction, and the edge of the second insulating sheet extends outside the range of the side plate.

[0012] In one embodiment, a second folded edge is formed at the top edge of the second insulating sheet, and the second folded edge extends from one side of the extension piece facing the battery assembly to the other side; the bottom edge of the second insulating sheet extends to the bottom of the battery assembly.

[0013] For the above battery module, the first insulating sheet and the second insulating sheet can respectively insulate and isolate the battery assembly in two different directions. Moreover, since the first folded edge of the first insulating sheet can wrap at least part of the edge of the end plate, the distance between the edge of the end plate and the battery assembly is farther, thereby increasing the creepage distance and electrical clearance between the end plate and the battery assembly. In this way, during the use of the battery module, the probability of the first insulating sheet being polarized and charged can be effectively reduced, thereby effectively preventing the insulation failure of the first insulating sheet. Therefore, the insulation performance of the above battery module is improved.

[0014] In addition, the present invention also provides a battery pack.

[0015] A battery pack includes the battery module according to any one of the above preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. 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 efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the battery module in a preferred embodiment of the present invention;

[0018] Figure 2 is Figure 1 a schematic structural view of the battery module shown from another angle;

[0019] Figure 3 is Figure 1 an exploded view of the battery module shown;

[0020] Figure 4 is Figure 1 a schematic structural view of the end plate in the battery module shown;

[0021] Figure 5 is Figure 1 a schematic structural view of the first insulating sheet in the battery module shown;

[0022] Figure 6 is Figure 1 a schematic structural view of the side plate in the battery module shown;

[0023] Figure 7 is Figure 1 a schematic structural view of the second insulating sheet in the battery module shown. Detailed Embodiments

[0024] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed embodiments of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0025] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0030] Please refer to Figure 1 , the present utility model provides a battery module 100. In addition, the present utility model also provides a battery pack.

[0031] The above battery pack includes the above battery module 100 and can be powered by the above battery module 100. Among them, the above battery pack can supply electrical energy to an electrical device, and the electrical device can be a vehicle, a spacecraft, an electric toy, an electric tool, an energy storage device, a amusement device, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc.; the amusement device can be a carousel, a drop tower, etc.

[0032] For a new energy vehicle, the above battery module can be used as a drive power source to replace fossil fuels to provide driving power. Moreover, the battery pack also includes a battery management system (BMS) to manage the battery module 100. Generally, a plurality of battery modules 100 are provided, and the plurality of battery modules 100 can be electrically connected in series, in parallel, or in a hybrid manner of series and parallel, and are communicatively connected to the battery management system. The above battery management system controls and monitors the working states of the respective battery modules 100.

[0033] Please refer to again Figure 2 and Figure 3 In the battery module 100 of the preferred embodiment of the present utility model, it includes a battery assembly 110, end plates 120, first insulating sheets 130, side plates 140, and second insulating sheets 150.

[0034] The battery assembly 110 generally includes a plurality of battery cells arranged in sequence and an insulating film covering the outside of the plurality of battery cells. While fixing the plurality of battery cells, the insulating film can also play a role of insulating isolation. The arrangement direction of the plurality of battery cells is the length direction of the battery assembly 110, and the width direction of the battery cell is the width direction of the battery assembly 110. Specifically, in this embodiment, the battery cells are square shell batteries, so the battery assembly 110 is also generally in the shape of a long cuboid. The plurality of battery cells can be electrically connected in series, in parallel, or in a hybrid manner of series and parallel, and adjacent battery cells can be electrically connected through connecting pieces such as bus bars.

[0035] The material of the end plate 120 is generally aluminum metal, which can be a profile or a cast aluminum. The end plates 120 are arranged on both sides of the battery assembly 110 in the length direction to provide support strength for the battery module 100. A first insulating sheet 130 is provided between each end plate 120 and the battery assembly 110. The first insulating sheet 130 can be bonded to the surface of the end plate 120 close to the battery assembly 110, or can be fixed only through the clamping action of the end plate 120 and the battery assembly 110. The first insulating sheet 130 can be a film sheet with good insulation performance such as a PET film or a PC film, and can play a role of insulating isolation between the battery assembly 110 and the end plate 120.

[0036] Please refer to Figure 5 , a first folded edge 131 protruding toward the end plate 120 is formed at the edge of the first insulating sheet 130, and the first folded edge 131 can be formed by bending the edge of the first insulating sheet 130. Moreover, the first folded edge 131 covers at least a part of the edge of the end plate 120 on the side facing the battery module 110. In this way, the distance between the edge of the end plate 120 and the battery module 110 is farther, so that the creepage distance and the electrical clearance between the end plate 120 and the battery module 110 can be increased. During the use of the battery module 100, the probability that the first insulating sheet 130 is polarized and charged can be effectively reduced, thereby effectively preventing the insulation failure of the first insulating sheet 130.

[0037] Please refer to Figure 4 , in this embodiment, a sinking step 121 is formed along the edge of each end plate 120 on the side facing the battery module 110, and the first folded edge 131 extends into the sinking step 121.

[0038] Specifically, the sinking step 121 can be processed by cutting the edge of the end plate 120. The cooperation between the sinking step 121 and the first folded edge 131 can position and limit the first insulating sheet 130, so it is convenient to install the first insulating sheet 130 and can improve the stability of the first insulating sheet 130, preventing the first insulating sheet 130 from shifting due to aging, vibration, etc.

[0039] The end plate 120 and the first insulating sheet 130 are generally both arranged in a rectangular shape. The sinking step 121 can extend along the circumferential direction of the edge of the end plate 120 and form a closed ring, or can be only distributed locally on the edge of the end plate 120. For example, in this embodiment, the sinking step 121 is formed on the edges of three sides of the end plate 120 except the top, and the first folded edge 131 is formed on the edges of three sides of the first insulating sheet 130 opposite to the sinking step 121. That is, the first folded edge 131 is formed on the edges of three sides of the first insulating sheet 130 corresponding to the end plate 120 one by one, so as to realize the limit fixation of the first insulating sheet 130 in two directions and prevent the insulation failure caused by the shift of the first insulating sheet 130. Specifically, the bottom edge and the two widthwise edges of the end plate 120 are recessed to form the sinking step 121, and the sinking steps 121 located on different sides are continuous with each other. The first insulating sheet 130 also forms continuous first folded edges 131 on three edges to be embedded in the sinking step 121. Thus, the first insulating sheet 130 can not only increase the creepage distance in the width direction and the height direction of the end plate, but also realize the limit in the width direction and the height direction of the end plate 120, improving the overall stability and safety.

[0040] Since the top edge of the end plate 120 does not form a sunken step 121, the end face of the top edge is flat, which facilitates leading out a plurality of electrical components connected to the battery assembly 110 from above the top edge of the end plate 120. At this time, the top edge of the end plate 120 is not covered by the first folded edge 131.

[0041] Specifically, in this embodiment, in order to further increase the creepage distance between the end plate 120 and the battery assembly 110, on the premise that the top edge of the end plate 120 is not covered by the first folded edge 131, the height of the first insulating sheet 130 is set to be greater than or equal to the height of the end plate 120 and the battery assembly 110. Specifically, if the height of the battery assembly 110 is greater than the height of the end plate 120, the height of the first insulating sheet 130 is greater than the height of the battery assembly 110; if the height of the end plate 120 is greater than the height of the battery assembly 110, the height of the first insulating sheet 130 is greater than the height of the end plate 120, so as to prevent insulation failure between the top of the end plate 120 and the top of the battery assembly 110.

[0042] In addition, in this embodiment, referring to Figure 5 , the part of the first folded edge 131 higher than the end plate 120 is recessed inward to form an avoidance portion 132. The avoidance portion 132 is used to avoid the bolts (not shown in the figure) fastened to the end plate 120, avoid interference with the bolt installation, and at the same time can maintain the creepage distance.

[0043] It should be noted that in this embodiment, the "top" refers to the end facing upward during the use of the battery module 100, and the "bottom" refers to the end facing downward.

[0044] The material of the side plate 140 is generally also aluminum metal, which is strip-shaped and extends along the length direction of the battery assembly 110. The side plates 140 are arranged on both sides in the width direction of the battery assembly 110, and the side plates 140 on both sides are fixedly connected to the end plates 120 on both sides of the battery assembly 110 to jointly provide support and fixation.

[0045] Please refer to Figure 6 together. In this embodiment, at both ends of the length direction of each side plate 140, edges are formed with first bending portions 141 protruding toward the battery assembly 110, and the first bending portions 141 at both ends of the side plate 140 are respectively attached to and connected to the side of the end plates 120 on both sides of the battery assembly 110 facing away from the battery assembly 110.

[0046] The first bending portion 141 can be formed by bending the edges at both ends of the side plate 140 inward, or plates protruding towards the battery assembly 110 can be welded to the edges at both ends of the side plate 140 to form the first bending portion 141. The first bending portion 141 can be connected to the end plate 120 by means of screwing with threaded fasteners or welding. Moreover, since the first bending portion 141 is in contact with the side of the end plate 120 facing away from the battery assembly 110, the contact area between the two is large, which can improve the connection strength between the side plate 140 and the end plate 120. Moreover, the side plate 140 can be attached to the first folded edge 131, thereby ensuring the stability of the first insulating sheet 130. When the first folded edge 131 is disposed on the sinking step 121, the first folded edge 131 can be prevented from protruding from the end plate 120, reducing the volume occupied, and at the same time facilitating the installation of the side plate 140 and the end plate 120, and ensuring the connection strength between the side plate 140 and the end plate 120.

[0047] Further, in this embodiment, a second bending portion 142 protruding towards the battery assembly 110 is formed at the bottom edge of each side plate 140, and the second bending portion 142 supports the bottom of the battery assembly 110. Similarly, the second bending portion 142 can be formed by bending the bottom edge of the side plate 140 inward, or plates protruding towards the battery assembly 110 can be welded to the bottom edge of the side plate 140 to form the second bending portion 142. The second bending portion 142 can provide support for the bottom of the battery assembly 110, thereby further improving the overall support strength of the battery module 100. Moreover, the second bending portion 142 can also provide protection for the bottom of the battery assembly 110, effectively preventing the insulating film on the surface of the battery assembly 110 from being punctured.

[0048] A second insulating sheet 150 is disposed between each side plate 140 and the battery assembly 110. The second insulating sheet 150 can be bonded to the inner surface of the side plate 140, or can be fixed only by the clamping action between the side plate 140 and the battery assembly 110. The second insulating sheet 150 can be formed of the same material as the first insulating sheet 130, and can be a film sheet with good insulation performance such as a PET film or a PC film, which can play an insulating and isolating role between the battery assembly 110 and the side plate 140.

[0049] In addition, in this embodiment, an extension piece 143 protruding beyond the height range of the battery assembly 110 is provided on the side plate 140 in the height direction, and the edge of the second insulating sheet 150 extends beyond the range of the side plate 140.

[0050] That is to say, the top edge of the side plate 140 is higher than the top edge of the battery assembly 110, and the size of the second insulating sheet 150 is larger than that of the side plate 140. Generally, the edge of the second insulating sheet 150 extends beyond the edge of the side plate 140 by about 2 mm to 5 mm. Therefore, the entire large surface of the side plate 140 is separated from the battery assembly 110 by the second insulating sheet 150, and the insulation performance between the side plate 140 and the battery assembly 110 can be significantly improved.

[0051] Furthermore, please refer to Figure 7 together. In this embodiment, a second folded edge 151 is formed at the top edge of the second insulating sheet 150, and the second folded edge 151 extends from one side of the extension piece 143 facing the battery assembly 110 to the other side.

[0052] It can be seen that the second folded edge 151 can be formed by bending the top edge of the second insulating sheet 150 twice and cooperates with the main body part of the second insulating sheet 150 to form a U shape, so as to effectively cover the top edge of the side plate 140 to prevent it from being exposed. In this way, the distance between the top edge of the side plate 140 and the battery assembly 110 can be made farther, thereby increasing the creepage distance and electrical clearance between the side plate 140 and the battery assembly 110, and effectively preventing the second insulating sheet 150 from being polarized and charged. And the setting of the second folded edge 151 also facilitates the relative position fixation of the second insulating sheet 150 and the side plate 140, preventing the position of the second insulating sheet 150 from shifting.

[0053] In other embodiments, referring to Figure 3 and Figure 7 shown, the bottom edge of the second insulating sheet 150 is bent and extended to the bottom of the battery assembly 110, so as to ensure that both the top and bottom of the second insulating sheet 150 can be limited, further improving the stability of the second insulating sheet 150.

[0054] Please refer to Figure 2 and Figure 3 again. In this embodiment, a third insulating sheet 160 is provided at the bottom of the battery assembly 110. The third insulating sheet 160 can also be a film sheet with good insulation performance such as an ET film or a PC film. The third insulating sheet 160 is covered on the bottom of the battery assembly 110, which can protect the battery assembly 110 and at the same time play an insulating and isolating role between the battery assembly 110 and the liquid cooling plate (not shown in the figure) of the battery module 100 and the inner wall of the box. It can be seen that the first insulating sheet 130, the second insulating sheet 150 and the third insulating sheet 160 can realize insulating isolation of the battery assembly 110 in three different directions, so it can also improve the insulation performance of the battery module 100 to a certain extent.

[0055] Further, in this embodiment, both ends of the third insulating sheet 160 in the width direction respectively extend to the range of the second bending portions 142 on both sides of the battery assembly 110 and are attached to the inner sides of the second bending portions 142. The second bending portions 142 can provide attachment points for the third insulating sheet 160, facilitating the installation of the third insulating sheet 160. Moreover, the second bending portions 142 can press the third insulating sheet 160 against the bottom of the battery assembly 110, effectively preventing the third insulating sheet 160 from falling off. The second bending portions 142 can also protect the third insulating sheet 160 and effectively prevent the third insulating sheet 160 from being punctured.

[0056] In addition, in this embodiment, both ends of the second insulating sheet 150 in the length direction respectively extend to contact the first folded edges 131 of the first insulating sheets 130 on both sides; both ends of the third insulating sheet 160 in the length direction respectively extend to contact the first folded edges 131 of the first insulating sheets 130 on both sides, and both ends of the third insulating sheet 160 in the width direction respectively extend to contact the second insulating sheets 150 on both sides.

[0057] The first folded edges 131 of the first insulating sheet 130, the second insulating sheet 150, and the third insulating sheet 160 can be adhered to each other to form an integral structure. Specifically, the first insulating sheet 130, the second insulating sheet 150, and the third insulating sheet 160 can be connected by an adhesive, or the first insulating sheet 130, the second insulating sheet 150, and the third insulating sheet 160 can be directly lap-connected, which can avoid forming gaps at the junctions of the insulating sheets, thereby enclosing a relatively closed insulating environment. In this way, the insulation performance of the battery module 100 can be further improved.

[0058] For the above-mentioned battery module 100, the first insulating sheet 130 and the second insulating sheet 150 can respectively insulate and isolate the battery assembly 110 in two different directions, thus ensuring the overall insulation of the battery module 100. Moreover, since the first folded edge 131 of the first insulating sheet 130 can wrap at least part of the edge of the end plate 120, making the distance between the edge of the end plate 120 and the battery assembly 110 farther, the creepage distance and electrical clearance between the end plate 120 and the battery assembly 110 can be increased. In this way, during the use of the battery module 100, the probability of the first insulating sheet 130 being polarized and charged can be effectively reduced, thereby effectively preventing the insulation failure of the first insulating sheet 130. Therefore, the insulation performance of the above-mentioned battery module 100 is improved.

[0059] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0060] The embodiments described above merely represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A battery module (100), comprising a battery assembly (110), end plates (120) arranged on both sides of the battery assembly (110) in a length direction, a first insulating sheet (130) arranged between the end plates (120) and the battery assembly (110), side plates (140) arranged on both sides of the battery assembly (110) in a width direction, and a second insulating sheet (150) arranged between the side plates (140) and the battery assembly (110), characterized in that: The edge of the first insulating sheet (130) is formed with a first folded edge (131) protruding toward the end plate (120), and the first folded edge (131) covers at least a portion of the edge of the end plate (120) facing the battery assembly (110).

2. The battery module (100) according to claim 1, characterized in that: A sinking step (121) is formed along the edge of each end plate (120) on a side facing the battery assembly (110), and the first folded edge (131) extends into the sinking step (121).

3. The battery module (100) according to claim 2, characterized in that: The sunken step (121) is formed on the edges of three sides of the end plate (120) except the top, and the first folded edge (131) is formed on the edges of three sides of the first insulating sheet (130) opposite to the sunken step (121), and the height of the first insulating sheet (130) is greater than or equal to the height of the end plate (120) and the battery assembly (110).

4. The battery module (100) according to claim 1, characterized in that: The edges at both ends of each side plate (140) in the length direction are formed with a first bent portion (141) protruding toward the battery assembly (110), and the first bent portions (141) at both ends of the side plate (140) are respectively attached to and connected to a side of the end plate (120) facing away from the battery assembly (110).

5. The battery module (100) according to claim 4, characterized in that: A second bent portion (142) protruding toward the battery assembly (110) is formed on the bottom edge of each side plate (140), and the second bent portion (142) is supported on the bottom of the battery assembly (110).

6. The battery module (100) according to claim 5, characterized in that: It also includes a third insulating sheet (160) arranged at the bottom of the battery assembly (110), and the two ends of the third insulating sheet (160) in the width direction respectively extend to the range of the second bending portion (142) on both sides of the battery assembly (110) and fit with the inner side of the second bending portion (142).

7. The battery module (100) according to claim 6, characterized in that: The two ends of the second insulating sheet (150) in the length direction respectively extend to contact the first folded edges (131) of the first insulating sheets (130) on both sides, the two ends of the third insulating sheet (160) in the length direction respectively extend to contact the first folded edges (131) of the first insulating sheets (130) on both sides, and the two ends of the third insulating sheet (160) in the width direction respectively extend to contact the second insulating sheets (150) on both sides.

8. The battery module (100) according to claim 1, characterized in that: The side plate (140) is provided with an extension piece (143) protruding beyond the height range of the battery assembly (110) along the height direction, and the edge of the second insulating sheet (150) extends beyond the range of the side plate (140).

9. The battery module (100) according to claim 8, characterized in that: A second folded edge (151) is formed on the top edge of the second insulating sheet (150), and the second folded edge (151) extends from one side of the extension sheet (143) toward the other side of the battery assembly (110); The bottom edge of the second insulating sheet (150) extends to the bottom of the battery assembly (110).

10. A battery pack, characterized in that: A battery module (100) comprising any one of claims 1 to 9.

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