Battery Module and Assembly Method

Abstract

The present application discloses a battery module and an assembly method. The battery module includes: a battery cell assembly, including a battery cell group and a connecting member. The battery cell group includes at least one battery cell. Along the length direction of the battery cell, connecting members are connected to both opposite sides of the battery cell group. On the side of the connecting member facing away from the battery cell group, a first surface and a second surface are sequentially arranged from top to bottom. The first included angle α between the first surface and the horizontal plane satisfies: 0 < α < 90°. The second included angle β between the second surface and the horizontal plane satisfies: 0 < β ≤ 90°, and α < β; a box body assembly that defines an installation cavity for accommodating the battery cell assembly. On the cavity wall of the installation cavity corresponding to the connecting member, a third surface and a fourth surface are sequentially arranged from top to bottom. The third surface is parallel to the first surface, and the fourth surface is parallel to the second surface; a first adhesive layer is disposed at least between the first surface and the third surface, and between the second surface and the fourth surface. In this embodiment, the inclined surface bears the adhesive, which can improve the problem of uneven distribution of the adhesive.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular, to a battery module and an assembly method thereof. Background Art

[0002] A battery module is an important part of the energy system of an electric vehicle, which mainly includes a battery cell group and a battery box body, and the battery cell group is connected inside the battery box body. In related technologies, the battery cell group is usually connected to the battery box body by an adhesive bonding method. However, after the adhesive is coated on the bonding surface between the battery box body and the battery cell group, the adhesive will flow downward under the action of gravity and accumulate at the bottom of the battery box body, resulting in uneven distribution of the adhesive and affecting the bonding effect. Summary of the Invention

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery module, which can improve the problem of uneven distribution of the adhesive and enhance the bonding effect.

[0004] The present application also provides an assembly method for forming the above battery module.

[0005] According to the battery module in the first embodiment of the present application, it includes:

[0006] A battery cell assembly, including a battery cell group and a connecting member. The battery cell group includes at least one battery cell. Along the length direction of the battery cell, connecting members are connected to both opposite sides of the battery cell group. At least a first surface and a second surface are provided on the side of the connecting member facing away from the battery cell group. The first surface and the second surface are arranged in sequence along the top-down direction. In the same connecting member, the direction from the lower end to the upper end of the first surface is defined as a first direction, the direction from the lower end to the upper end of the second surface is defined as a second direction, and the direction from the battery cell group to the connecting member is defined as a third direction. There is a first included angle α between the first direction and the third direction, and a second included angle β between the second direction and the third direction, satisfying: 0 < α < 90°, 0 < β ≤ 90°, and α < β;

[0007] A box body assembly, defining an installation cavity for accommodating the battery cell assembly. The cavity wall of the installation cavity is provided with at least a third surface and a fourth surface corresponding to the connecting member. The third surface and the fourth surface are arranged in sequence along the top-down direction, and the third surface is parallel to the first surface, and the fourth surface is parallel to the second surface;

[0008] A first bonding layer, provided at least between the first surface and the third surface, and between the second surface and the fourth surface.

[0009] According to the battery module of the embodiment of the present application, it has at least the following beneficial effects:

[0010] This embodiment uses an inclined surface to carry the adhesive, which can improve the problem of uneven distribution caused by the adhesive flowing under the action of gravity and improve the bonding effect.

[0011] In other embodiments of the present application, a fifth surface is further provided on the side of the connector away from the battery cell group, and the first surface, the second surface and the fifth surface are sequentially provided from top to bottom, and the direction from the lower end to the upper end of the fifth surface is referred to as a fourth direction, and a third angle γ is formed between the fourth direction and the third direction, satisfying: 0<γ<90°, and γ<β;

[0012] The cavity wall of the installation cavity is further provided with a sixth surface corresponding to the connecting member, and along the direction from top to bottom, the third surface, the fourth surface and the sixth surface are provided in sequence, and the sixth surface is parallel to the fifth surface;

[0013] The first adhesive layer is disposed between the first surface and the third surface, between the second surface and the fourth surface, and between the fifth surface and the sixth surface.

[0014] In other embodiments of the present application, the first angle α satisfies: 20°<α<60°.

[0015] In other embodiments of the present application, the second angle β satisfies: β=90.

[0016] In other embodiments of the present application, the connecting member is made of a light-transmitting material.

[0017] In other embodiments of the present application, a seventh surface is further provided on the side of the connecting member facing away from the battery cell group, and the seventh surface is located at the top of the first surface. The cavity wall of the mounting cavity is provided with an eighth surface corresponding to the seventh surface, and the eighth surface is located at the top of the third surface. The seventh surface abuts against the eighth surface to limit the downward displacement of the connecting member.

[0018] In other embodiments of the present application, the battery module further includes a second adhesive layer, and the second adhesive layer is disposed between the battery cell and the connector.

[0019] In other embodiments of the present application, the battery cell assembly includes a plurality of the battery cells, and the plurality of the battery cells are arranged in parallel along the width direction of the battery cells, and the same side of the plurality of the battery cells is connected to the same connecting member.

[0020] In other embodiments of the present application, along the length direction of the battery cell, the box assembly defines a plurality of the installation cavities, the battery module includes a plurality of the battery cell assemblies, and the plurality of the battery cell assemblies are respectively located in corresponding installation cavities.

[0021] According to the assembly method in the second embodiment of the present application, the following steps are included:

[0022] Prepare the box body assembly and the battery cell assembly;

[0023] Coat an adhesive on at least the third surface, and at least part of the adhesive can remain on the third surface;

[0024] Assemble the battery cell assembly into the installation cavity in the direction from top to bottom, so that the first surface presses the adhesive on the third surface, thereby causing part of the adhesive to flow into the gap between the second surface and the fourth surface;

[0025] Cure the adhesive to form the first adhesive layer.

[0026] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0027] The following further describes the present application in conjunction with the drawings and embodiments, where:

[0028] Figure 1 is a three-dimensional schematic diagram of a battery module in an embodiment of the present application;

[0029] Figure 2 is Figure 1 the exploded schematic diagram of the battery module in;

[0030] Figure 3 is Figure 1 the three-dimensional schematic diagram of the connecting member in;

[0031] Figure 4 is Figure 3 the side view of the connecting member in;

[0032] Figure 5 is Figure 1 the cross-sectional schematic diagram of the box body assembly in;

[0033] Figure 6 is Figure 1 the cross-sectional schematic diagram of the battery module in;

[0034] Figure 7 is Figure 6 the enlarged schematic diagram of area A in;

[0035] Reference Signs:

[0036] Battery cell assembly 100, battery cell group 110, battery cell 111, connecting member 120, first surface 121, second surface 122, fifth surface 123, seventh surface 124, positioning post 125, boss 126;

[0037] The housing assembly 200, the installation cavity 210, the third surface 211, the fourth surface 212, the sixth surface 213, the eighth surface 214, the separator 220;

[0038] The first adhesive layer 300;

[0039] The second adhesive layer 400;

[0040] The bus bar 500, the through hole 510;

[0041] The first direction L1, the second direction L2, the third direction L3, the fourth direction L4;

[0042] The first included angle α, the second included angle β, the third included angle γ. Detailed implementation manners

[0043] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0044] In the description of the present application, it should be understood that for the orientation description, such as the up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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, and thus should not be construed as a limitation to the present application.

[0045] In the description of the present application, the meaning of several is more than one, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If the first and the second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0046] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0047] In the description of this application, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0048] Referring to Figure 1 、 Figure 2 , the battery module of the embodiment of this application includes a battery cell assembly 100 and a box body assembly 200. The box body assembly 200 is used to fix and protect the internal battery cell assembly 100, and the following is a specific description with reference to the accompanying drawings.

[0049] For the convenience of description, taking a single battery cell as an example, this application defines the directions appearing in the text as follows: The length direction of the battery cell refers to the relatively larger horizontal direction of the size, that is, the front-back direction in Figure 1 ; the width direction of the battery cell refers to the relatively smaller horizontal direction of the size, that is, the left-right direction in Figure 1 ; the height direction of the battery cell refers to the vertical direction, that is, the up-down direction in Figure 1 .

[0050] The box body assembly 200 can be an integral frame or a split frame formed by splicing multiple components. Adapted to the square battery cells in the figure, the box body assembly 200 is a rectangular frame, which has an installation cavity inside. The shape and size of the installation cavity are both adapted to the battery cell assembly 100, so that the battery cell assembly 100 can be stably placed in the installation cavity.

[0051] The battery cell assembly 100 is connected to the box body assembly 200, so that the two are in a relatively fixed state. Referring to Figure 2, the battery cell assembly 100 includes a battery cell group 110 and a connecting member 120. The battery cell group 110 includes at least one battery cell 111. It should be understood that when the battery cell group 110 includes more than two battery cells 111, the battery cells 111 may or may not have a connection relationship with each other. That is, at this time, the battery cell group 110 only represents a collection of battery cells 111. Along the length direction of the battery cell 111, connecting members 120 are connected to both opposite sides of the battery cell group 110. The battery cell group 110 is connected to the box body assembly 200 through the connecting members 120. The connecting members 120 and the adhesive can play a certain buffering role and reduce the impact of external shocks on the battery cell group 110. In addition, the connecting members 120 can also be made of materials with certain heat insulation properties, reducing the impact of changes in the external environmental temperature on the temperature of the battery cell group 110 and helping to maintain the consistency of the temperature of the battery cell group 110. In some specific embodiments, the material of the connecting member 120 is plastic, which has both buffering and heat insulation effects.

[0052] In this embodiment, the connecting member 120 and the box body assembly 200 are connected by bonding, and the problem of uneven distribution of the adhesive can be improved. Specifically, refer to Figure 3 , Figure 4 , the connecting member 120 has a side facing the battery cell group 110 (for the convenience of description, it is called the inner side) and a side facing away from the battery cell group 110 (for the convenience of description, it is called the outer side). Among them, the inner side of the connecting member 120 is in contact with the battery cell group 110, specifically, it can be in contact with the adjacent battery cell 111 and is fixedly connected to the battery cell 111. At least a first surface 121 and a second surface 122 are provided on the outer side of the connecting member 120. Along the direction from top to bottom, the first surface 121 and the second surface 122 are arranged in sequence. That is, the lower end of the first surface 121 is connected to the upper end of the second surface 122.

[0053] Taking Figure 3 the shown connecting member 120 as an example, the direction from the lower end to the upper end of the first surface 121 (that is, the direction parallel to the first surface 121 and upward) is defined as the first direction L1, the direction from the lower end to the upper end of the second surface 122 (that is, the direction parallel to the second surface 122 and upward) is defined as the second direction L2, and the direction from the battery cell group 110 to the connecting member 120 (that is, the horizontal direction from the inner side to the outer side of the connecting member 120) is the third direction L3. There is a first included angle α between the first direction L1 and the third direction L3, and a second included angle β between the second direction L2 and the third direction L3, satisfying: 0 < α < 90°, 0 < β ≤ 90°, and α < β. That is, at least the first surface 121 is an inclined surface inclined outward. The second surface 122 can be a vertical surface or an inclined surface inclined outward. When the second surface 122 is an inclined surface, the inclination angle of the first surface 121 is smaller than the inclination angle of the second surface 122.

[0054] Refer to Figure 5, to achieve cooperation with the connecting member 120, the box body assembly 200 defines an installation cavity 210 for accommodating the battery cell assembly 100. Among them, the two connecting members 120 on both sides of the battery cell assembly 100 are respectively matched with the opposite side cavity walls of the installation cavity 210. Taking one side cavity wall as an example, at least a third surface 211 and a fourth surface 212 are provided thereon. Along the direction from top to bottom, the third surface 211 and the fourth surface 212 are arranged in sequence, that is, the lower end of the third surface 211 is connected to the upper end of the fourth surface 212. Among them, the third surface 211 is parallel to the first surface 121, and the fourth surface 212 is parallel to the second surface 122. In other words, the third surface 211 is an inclined surface, and the fourth surface 212 can be a vertical surface or an inclined surface inclined outward. When the fourth surface 212 is an inclined surface, the inclination angle of the third surface 211 is smaller than the inclination angle of the second surface 122.

[0055] Based on the above structure, the adhesive can be first coated on the third surface 211. Since the third surface 211 is an inclined surface, the flow of the adhesive can be reduced. It should be noted that after coating, the adhesive can completely remain on the third surface 211, or a certain amount of adhesive is allowed to flow downward.

[0056] Refer to Figure 5 , it can be seen that the installation cavity 210 has a certain depth. If only one inclined surface is provided on the cavity wall of the installation cavity 210 for assembling with the connecting member 120, the following problems will exist: the horizontal extension distance of the inclined surface is related to the height of the inclined surface and the inclination angle respectively. When the height of the inclined surface is certain, if the inclined surface needs to be set relatively gentle to place the adhesive, the horizontal extension distance of the inclined surface will increase, thereby increasing the volume of the box body assembly 200; if it is necessary to control the horizontal extension distance of the inclined surface to reduce the volume of the box body assembly 200, the inclination angle of the inclined surface will increase accordingly, making it difficult to ensure the retention effect on the adhesive. Based on the above problems, a fourth surface 212 is also provided in this embodiment. The fourth surface 212 can be a vertical surface or an inclined surface with an inclination angle greater than that of the third surface 211. In either case, it can reduce the height of the third surface 211, so that the third surface 211 can be set relatively gentle without significantly increasing the volume of the box body assembly 200. When the fourth surface 212 is a vertical surface, it is most beneficial to control the volume of the box body assembly 200; when the fourth surface 212 is an inclined surface, the fourth surface 212 can also play a certain retention effect, which helps to further improve the problem of adhesive accumulation at the bottom of the installation cavity 210.

[0057] In addition, the first surface 121 and the third surface 211 can also play the role of guiding surfaces, which is convenient for guiding the battery cell assembly 100 into the installation cavity and automatically aligning.

[0058] This embodiment also provides a first adhesive layer 300. Refer to Figure 6 、 Figure 7, the first adhesive layer 300 is disposed at least between the first surface 121 and the third surface 211, and between the second surface 122 and the fourth surface 212, so as to fix the connecting member 120 to the box body assembly 200. The first adhesive layer 300 is formed after the adhesive is cured.

[0059] In some embodiments, referring to Figure 4 , a fifth surface 123 is further disposed on the outer side of the connecting member 120. Along the direction from top to bottom, the first surface 121, the second surface 122 and the fifth surface 123 are arranged in sequence. That is, the lower segment of the first surface 121 is connected to the upper end of the second surface 122, and the lower end of the second surface 122 is connected to the upper end of the fifth surface 123. Denote the direction from the lower end to the upper end of the fifth surface 123 (that is, the direction parallel to the fifth surface 123 and upward) as the fourth direction L4. There is a third included angle γ between the fourth direction L4 and the third direction L3, satisfying: 0 < γ < 90°, and γ < β. That is, the fifth surface 123 is also an inclined surface, and when the second surface 122 is an inclined surface, the inclination angle of the fifth surface 123 is smaller than that of the second surface 122.

[0060] Correspondingly, a sixth surface 213 is further disposed on the cavity wall of the installation cavity 210. Along the direction from top to bottom, the third surface 211, the fourth surface 212 and the sixth surface 213 are arranged in sequence. That is, the lower segment of the third surface 211 is connected to the upper end of the fourth surface 212, and the lower end of the fourth surface 212 is connected to the upper end of the sixth surface 213. The sixth surface 213 is parallel to the fifth surface 123. The sixth surface 213 and the third surface 211 are approximately located at the upper and lower ends of the cavity wall of the installation cavity 210, and can support the upper and lower ends of the battery cell assembly 100; at the same time, the battery cell assembly 100 can be pressed against the inclined surface under the action of gravity, thereby increasing the bonding strength between the battery cell assembly 100 and the box body assembly 200; in addition, the sixth surface 213 also has a certain retention effect. Even if part of the adhesive flows downward from the third surface 211 to the sixth surface 213, the sixth surface 213 can further slow down the flow of the adhesive and prevent the adhesive from accumulating at the bottom of the installation cavity 210.

[0061] Based on the above structure, the first adhesive layer 300 is disposed between the first surface 121 and the third surface 211, between the second surface 122 and the fourth surface 212, and between the fifth surface 123 and the sixth surface 213 to further increase the bonding area and ensure the bonding strength.

[0062] It should be noted that the inclination angles of the first surface 121 and the fifth surface 123 may be the same or different.

[0063] In some embodiments, the setting range of the first included angle α satisfies: 20° < α < 60°. Within this range, the first surface 121 and the third surface 211 can meet the retention requirements of most adhesives. It should be understood that the inclination degrees of the first surface 121 and the third surface 211 can be adjusted according to the fluidity of the adhesive. When the fluidity of the adhesive is poor, the inclination angles of the first surface 121 and the third surface 211 are relatively set larger. On the contrary, when the fluidity of the adhesive is good, the inclination angles of the first surface 121 and the third surface 211 are relatively set smaller, making the inclined surface smoother.

[0064] In some embodiments, the second included angle β = 0, that is, both the second surface 122 and the fourth surface 212 are vertical surfaces. As described above, using vertical surfaces for the second surface 122 and the fourth surface 212 helps to reduce the volume of the box assembly 200.

[0065] In some embodiments, the connecting member 120 is made of a light-transmitting material. Correspondingly, a photo-curable adhesive can be used as the adhesive. After the battery cell assembly 100 is assembled into the installation cavity 210, the curing light can pass through the connecting member 120 and irradiate the bonding position, thereby accelerating curing and reducing the total assembly time. Taking the example shown in the figure, at least the upper end of the connecting member 120 is exposed between the battery cell assembly 100 and the box assembly 200. Therefore, a light source can be arranged above the battery module to assist in curing.

[0066] Refer to Figures 3 to 7 , in some embodiments, a seventh surface 124 is further provided on the outer side of the connecting member 120. The seventh surface 124 can be the horizontal surface shown in the figure, which is located at the top of the first surface 121. The cavity wall of the installation cavity 210 is provided with an eighth surface 214 corresponding to the seventh surface 124. The eighth surface 214 is located at the top of the third surface 211. After assembly, the seventh surface 124 is located above and abuts against the eighth surface 214. This can limit the downward displacement of the connecting member 120. Combining with the guiding functions of the above-mentioned first surface 121 and third surface 211, the battery cell assembly 100 can be positioned synchronously during the assembly process, which helps to improve the assembly efficiency.

[0067] In some embodiments, the battery cell 111 and the corresponding connecting member 120 are also connected by bonding. Refer to Figure 3 , the battery module further includes a second bonding layer 400. The second bonding layer 400 is disposed between the battery cell 111 and the connecting member 120 and is adhesively fixed to both of them respectively. It should be noted that the battery cell 111 and the connecting member 120 can be first connected to each other to form the battery cell assembly 100, and then the battery cell assembly 100 and the box assembly 200 are assembled. Since the battery cell 111 and the connecting member 120 form the battery cell assembly 100 in an open space and there is no problem of adhesive accumulation, the inner side of the connecting member 120 can be bonded to the battery cell 111 by a vertical surface.

[0068] In some embodiments, referring to Figure 1 , Figure 2 , the battery cell assembly 100 includes a plurality of battery cells 111, and the plurality of battery cells 111 are arranged in parallel along the width direction of the battery cells 111. The same side of each battery cell 111 is connected to the same connecting member 120. That is, in the same battery cell assembly 100, all the battery cells 111 can be fixed by two connecting members 120, so that the battery cell assembly 100 can be assembled as a whole. In some other embodiments, the battery cell assembly 100 can also be provided with a plurality of connecting members 120, and each battery cell 111 is connected to two separate connecting members 120.

[0069] Based on the above embodiments, in some embodiments, the battery module includes a plurality of battery cell assemblies 100. Correspondingly, a plurality of installation cavities 210 are provided inside the box body assembly 200. Referring to Figures 5 to 7 , at least one partition member 220 is provided inside the box body assembly 200. The partition member 220 divides the internal space of the box body assembly 200 into a plurality of installation cavities 210. Taking the illustration as an example, one partition member 220 is provided inside the box body assembly 200, which divides into two installation cavities 210, and the two installation cavities 210 are arranged along the length direction of the battery cells 111. The third surface 211 and the fourth surface 212 as described above are provided on both opposite sides of the partition member 220. In some embodiments, the sixth surface 213 and the eighth surface 214 as described above can also be provided, so as to be able to realize the bonding and fixing of two battery cell assemblies 100 respectively.

[0070] It should be noted that the partition member 220 can be integrally formed on the box body assembly 200 or can be connected to the main structure of the box body assembly 200 as a separate structural member.

[0071] Referring to Figures 4 to 7 , a positioning post 125 is further provided inside the connecting member 120. Specifically, a boss 126 protrudes from the inside of the connecting member 120, and the vertical positioning post 125 is provided on the boss 126. The battery module further includes a bus bar 500, and the bus bar 500 is electrically connected to the battery cells 111. Specifically, the two pole columns of two adjacent battery cells 111 are connected by a bus bar 500. A through hole 510 is provided on the bus bar 500. When the battery cell assembly 100 is assembled, the positioning post 125 is inserted into the through hole 510, so as to realize the positioning between the battery cells 111 and the connecting member 120.

[0072] The embodiment of the present application also discloses an assembly method, which is used to form the battery modules in the above embodiments, and includes the following steps:

[0073] Step 1: Prepare the above-mentioned battery cell assembly 100 and the box body assembly 200. Taking the battery cell assembly 100 with multiple battery cells 111 as an example, first, arrange the multiple battery cells 111 in the width direction to form a battery cell group 110. Then, apply adhesive on the inner side surface of the connecting member 120 that fits with the battery cell 111, and attach the two connecting members 120 to both opposite sides of the battery cell group 110 along the battery cell group 110. After the adhesive cures, the battery cell assembly 100 can be formed.

[0074] It should be noted that the steps of preparing the battery cell assembly 100 and the box body assembly 200 are not in a specific order.

[0075] Step 2: Apply adhesive on at least the third surface 211, and ensure that at least part of the adhesive can stay on the third surface 211.

[0076] Step 3: Assemble the battery cell assembly 100 into the installation cavity 210 in the direction from top to bottom, so that the first surface 121 presses the adhesive on the third surface 211, causing part of the adhesive to flow into the gap between the second surface 122 and the fourth surface 212. In this way, it can not only prevent the adhesive from flowing downward actively before being pressed and accumulating, but also enable the adhesive to flow into the gap between the second surface 122 and the fourth surface 212 under the pressure of the first surface 121, thereby increasing the bonding range.

[0077] Step 4: Cure the adhesive, thereby forming a first bonding layer 300 between the first surface 121 and the third surface 211, and between the second surface 122 and the fourth surface 212.

[0078] In the above-mentioned embodiment, the adhesive is applied on the third surface 211 at the upper end. When the adhesive flows downward actively or under pressure, a certain amount of adhesive can still be retained on the third surface 211, which can improve the problem of uneven adhesive distribution. On the other hand, during the assembly process of the battery cell assembly 100, the adhesive can naturally flow into the gap between the second surface 122 and the fourth surface 212 under the pressure of the first surface 121, which can eliminate the step of applying glue on the fourth surface 212 and help improve the assembly efficiency.

[0079] In some embodiments, when the connecting member 120 is also provided with a sixth surface 213, adhesive can also be applied on the sixth surface 213. When the height of the fourth surface 212 is relatively high and the retention effect of the third surface 211 on the adhesive is relatively good, the amount of adhesive flowing from the third surface 211 to the fourth surface 212 will gradually decrease, making it difficult to ensure that there is enough adhesive on the sixth surface 213. Based on this, applying adhesive on the sixth surface 213 away from the third surface 211 can improve the problem of uneven adhesive distribution.

[0080] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. Battery module, characterized in that, include: A cell assembly, comprising a cell group and a connector, wherein the cell group comprises at least one cell, and along the length direction of the cell, opposite sides of the cell group are connected to the connector, and the side of the connector away from the cell group is at least provided with a first surface and a second surface, and along the direction from top to bottom, the lower end of the first surface is connected to the upper end of the second surface, wherein, in the same connector, the direction from the lower end to the upper end of the first surface is the first direction, the direction from the lower end to the upper end of the second surface is the second direction, and the direction from the cell group to the connector is the third direction, and there is a first angle α between the first direction and the third direction, and there is a second angle β between the second direction and the third direction, satisfying: 0<α<90°, 0<β≤90°, and α<β; A box assembly, defining an installation cavity for accommodating the battery cell assembly, wherein a cavity wall of the installation cavity is provided with at least a third surface and a fourth surface corresponding to the connecting member, and along a direction from top to bottom, a lower end of the third surface is connected to an upper end of the fourth surface, and the third surface is parallel to the first surface, and the fourth surface is parallel to the second surface; The first adhesive layer is formed by curing an adhesive, and the first adhesive layer is at least arranged between the first surface and the third surface, and between the second surface and the fourth surface.

2. The battery module according to claim 1, wherein, A fifth surface is further provided on a side of the connector away from the battery cell group, and along a direction from top to bottom, a lower end of the second surface is connected to an upper end of the fifth surface, and a direction from the lower end to the upper end of the fifth surface is referred to as a fourth direction, and a third angle γ is formed between the fourth direction and the third direction, satisfying: 0<γ<90°, and γ<β; The cavity wall of the installation cavity is further provided with a sixth surface corresponding to the connecting piece, and along the direction from top to bottom, the lower end of the fourth surface is connected to the upper end of the sixth surface, and the sixth surface is parallel to the fifth surface; The first adhesive layer is disposed between the first surface and the third surface, between the second surface and the fourth surface, and between the fifth surface and the sixth surface.

3. The battery module according to claim 1, characterized in that, The first angle α satisfies: 20°<α<60°.

4. The battery module according to claim 1, wherein The second angle β satisfies: β=90.

5. The battery module according to claim 1, wherein The connecting piece is made of light-transmitting material.

6. The battery module according to claim 1, wherein A seventh surface is also provided on the side of the connector facing away from the battery cell group, and the seventh surface is located at the top of the first surface. An eighth surface is provided on the cavity wall of the mounting cavity corresponding to the seventh surface, and the eighth surface is located at the top of the third surface. The seventh surface abuts against the eighth surface to limit the downward displacement of the connector.

7. The battery module according to claim 1, characterized in that, The battery module further includes a second adhesive layer, which is arranged between the battery core and the connecting member.

8. The battery module according to claim 1, characterized in that, The battery cell assembly includes a plurality of battery cells. The plurality of battery cells are arranged in parallel along the width direction of the battery cells, and the same side of the plurality of battery cells is connected to the same connecting member.

9. The battery module according to claim 8, wherein, Along the length direction of the battery cell, the box assembly defines a plurality of the installation cavities, the battery module includes a plurality of the battery cell assemblies, and the plurality of the battery cell assemblies are respectively located in corresponding installation cavities.

10. An assembling method for forming the battery module according to any one of claims 1 to 9, characterized in that, The following steps are involved: Prepare the box body assembly and the battery cell assembly; Coat an adhesive on at least the third surface, and at least part of the adhesive can remain on the third surface; Assemble the battery cell assembly into the installation cavity in the direction from top to bottom, so that the first surface presses the adhesive on the third surface, thereby causing part of the adhesive to flow into the gap between the second surface and the fourth surface; Cure the adhesive to form the first adhesive layer.

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