Battery module and processing method thereof

Abstract

The invention relates to the technical field of batteries, in particular to a battery module and a processing method thereof. The battery module comprises a metal shell, a battery cell group, a foam group and two battery brackets, an accommodating cavity is formed in the metal shell, and the battery cell group and the foam group are arranged in the accommodating cavity; the metal shell is provided with a first shell and a second shell which are oppositely arranged in the thickness direction of the battery cell group, the first shell and the second shell form two openings communicated with the accommodating cavity in the width direction of the battery cell group, and the two battery brackets cover the openings respectively; and the first shell and the second shell are welded and fixed in the length direction of the battery cell group and then provide clamping pre-tightening force for the battery cell group and the foam group which are positioned in the first shell and the second shell. When the battery cell group expands in the thickness direction, the foam group is extruded and shrunk; when the battery cells are contracted from an expanded state to an original state, the foam group rebounds, so that uniform pre-tightening force is always applied to the battery cells.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a battery module and a processing method thereof. Background Art

[0002] Traditional battery modules include several battery cells stacked together and a metal frame. During the production process of the battery module, several battery cells need to be stacked together, and then the stacked battery cells are installed in the metal frame. In this structure, due to the insufficient binding force of the metal frame on the battery cells, the metal frame cannot provide a sufficient pre-tightening force for each battery cell. Generally, the pre-tightening force of the battery cells near both sides of the metal frame is too large, and the pre-tightening force of the battery cells located at the center is insufficient. This results in uneven pre-tightening forces of each single battery cell within the metal frame, making it impossible for each single battery cell to achieve full charge and discharge within the battery module, thus easily affecting the safety, stability, and service life of the entire battery module. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: aiming at the problem of uneven binding force of the metal frame in the existing battery module on the battery cells, to provide a battery module and a processing method thereof.

[0004] To solve the above technical problem, on the one hand, an embodiment of the present invention provides a battery module, including a metal shell, a battery cell group, a foam group, and two battery brackets. An accommodation cavity is formed inside the metal shell, and the battery cell group and the foam group are arranged in the accommodation cavity;

[0005] The metal shell has a first shell and a second shell oppositely arranged in the thickness direction of the battery cell group. The first shell and the second shell form two openings communicating with the accommodation cavity in the width direction of the battery cell group. The two battery brackets respectively cover the openings. After the first shell and the second shell are welded and fixed in the length direction of the battery cell group, they provide a clamping pre-tightening force for the battery cell group and the foam group located therein.

[0006] Optionally, the battery cell group includes a plurality of battery cells stacked along its thickness direction. The foam group includes a plurality of first foams arranged between two adjacent battery cells, a second foam arranged between the first shell and the battery cell group, and a third foam arranged between the second shell and the battery cell group.

[0007] Optionally, the battery module further includes an adhesive group, which includes a plurality of first double-sided adhesive layers disposed between the battery cell and the first foam, a second double-sided adhesive layer disposed between the first housing and the second foam, and a third double-sided adhesive layer disposed between the second housing and the third foam. In this embodiment, the first double-sided adhesive layer, the second double-sided adhesive layer, and the third double-sided adhesive layer are preferably double-sided tapes. The battery cell near the first foam is bonded to the first foam through the first adhesive layer; the first housing is bonded to the second foam through the second adhesive layer; the second housing is bonded to the third foam through the third adhesive layer, so that the first housing, the second housing, the battery cells, and the foam group form an integral body. During the expansion and contraction of the battery cells, the adhesive group keeps adjacent components bonded together, preventing misalignment between adjacent components, and enabling the metal housing to continuously apply a pre-tightening force to the battery cell group.

[0008] Optionally, the thickness of the battery module is less than the sum of the initial thicknesses of the foam group and the battery cell group. In this embodiment, this enables the metal housing to apply a certain pre-tightening force to the battery cell group, putting the battery cell group and the foam group in the accommodation cavity in a compressed state.

[0009] Optionally, the number of battery cells in the battery cell group is 3 - 15. The battery cell group with other numbers of battery cells is also within the protection scope of this embodiment. Preferably, the number of battery cells in the battery cell group is three, which can enable the metal housing to achieve a better pre-tightening effect on the battery cells.

[0010] Optionally, the first housing of the metal housing includes the first bottom plate and first side plates connected to opposite sides of the first bottom plate, the second housing includes the second bottom plate and second side plates connected to opposite sides of the second bottom plate, the first bottom plate and the second bottom plate are spaced apart, the first side plates are bent towards the second bottom plate, and the second side plates are bent towards the first bottom plate; the second side plates are welded to the outer sides of the first side plates, and an accommodation cavity is formed inside the first housing and the second housing.

[0011] Optionally, the battery bracket has an outlet channel matching the battery cell group, and the outlet channel communicates with the accommodation cavity.

[0012] Optionally, the metal housing is provided with positioning notches on the first side plates and the second side plates, and the side of the battery bracket is provided with positioning grooves, and the positioning grooves of the battery bracket communicate with the positioning notches of the metal housing.

[0013] Optionally, the battery module further includes two metal plates disposed between the first side plate of the metal housing and the battery cell group, and the thickness of the metal plate is 0.3 mm to 1.2 mm. In this embodiment, the metal plate can prevent the battery cells from being affected by the welding of the first housing and the second housing. At the same time, an insulating plate is disposed between the metal plate and the battery cells, which can better prevent the battery cells from short-circuiting.

[0014] According to the battery module of this embodiment, through the metal housing, a certain pre-tightening force can be applied to the limitedly stacked battery cells in the battery cell group in the thickness direction of the battery cell group by using the clamping force of the metal housing. At the same time, the foam group has high resilience. When the battery cell group expands in its thickness direction, the foam group is squeezed and contracted, so that all the battery cells in the battery cell group can be uniformly subjected to the pre-tightening force provided by the metal housing and the foam group, enabling the battery cells to effectively retract; when the battery cell group shrinks from the expanded state to the original state, the foam group will correspondingly rebound, continuously providing sufficient pre-tightening force for the battery cells in the battery cell group, ensuring that each battery cell can return to the original state during the limited expansion and retraction processes. Through the mutual cooperation of the metal housing and the foam group, each battery cell in the battery cell group can be uniformly and continuously pre-tightened throughout the entire charging and discharging process, ensuring that each single battery cell can be uniformly and continuously pre-tightened during the limited number of cyclic uses of the battery cell group, enabling the electrical performance of each single battery cell to remain basically consistent, thereby effectively improving the safety, stability and service life of the entire battery module.

[0015] On the other hand, an embodiment of the present invention provides a processing method for a battery module, including the following steps:

[0016] Stacking step: Stacking the battery cell group and the foam group in sequence along the thickness direction of the battery cell group to form a stacked group;

[0017] Housing installation step: Placing the first housing and the second housing on both sides of the stacked group respectively;

[0018] Bracket installation step: Installing two battery brackets at the opening enclosed by the first housing and the second housing respectively;

[0019] Clamping step: Pushing the first housing and the second housing to move towards each other so that the first housing and the second housing are butted to form the metal housing;

[0020] Welding step: Welding and fixing the first housing and the second housing on the side surfaces in the length direction of the battery cell group through a welding device.

[0021] According to the processing method of the battery module of this embodiment, the first shell and the second shell moving towards each other clamp the stacking group, and the metal outer shell is welded in the length direction of the battery cell group, so that the battery cell group can receive uniform and continuous pre-tightening force during the entire charging and discharging process. Furthermore, the battery cell group can effectively expand and retract during use, ensuring the safety and stability of the battery cell group during the process of cyclic use. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a battery module from a first perspective provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a battery module from a second perspective provided by an embodiment of the present invention;

[0024] Figure 3 is Figure 2 a schematic structural diagram cut along line A-A;

[0025] Figure 4 is an exploded view of a battery module provided by an embodiment of the present invention;

[0026] Figure 5 is an exploded view of a battery cell group of a battery module provided by an embodiment of the present invention;

[0027] Figure 6 is a flowchart of the processing method of the battery module provided by the present invention.

[0028] The reference numerals in the specification are as follows:

[0029] 1, metal outer shell; 2, battery cell; 3, accommodation cavity; 4, first foam; 5, second foam; 6, third foam; 7, first bottom plate; 8, second bottom plate; 9, battery bracket; 10, positioning notch; 11, first shell; 111, first side plate; 12, second shell; 121, second side plate; 13, metal plate; 14, insulating plate; 15, tab; 91, outlet channel. Detailed Embodiments

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] As Figures 1 to 5 shown, an embodiment of the present invention provides a battery module, including a metal outer shell 1, a battery cell group, a foam group and two battery brackets 9. An accommodation cavity 3 is formed inside the metal outer shell 1, and the battery cell group and the foam group are arranged in the accommodation cavity 3;

[0032] The metal housing 1 has a first housing 11 and a second housing 12 that are oppositely arranged in the thickness direction of the battery cell group. The first housing 11 and the second housing 12 form two openings communicating with the accommodation cavity 3 in the width direction of the battery cell group. Two battery brackets 9 are respectively covered at the openings. After the first housing 11 and the second housing 12 are welded and fixed in the length direction of the battery cell group, a clamping pre-tightening force is provided to the battery cell group and the foam group located therein.

[0033] In one embodiment, the battery cell group includes a plurality of battery cells 2 stacked along its thickness direction. The foam group includes a plurality of first foams 4 arranged between two adjacent battery cells 2, a second foam 5 arranged between the first housing 11 and the battery cell group, and a third foam 6 arranged between the second housing 12 and the battery cell group.

[0034] In one embodiment, the thickness of the battery module is less than the sum of the initial thickness of the foam group and the initial thickness of the battery cell group.

[0035] In the present invention, there are M battery cells 2 provided in the battery cell group. It is set that the thickness of each battery cell 2 in the initial state is X. Correspondingly, the initial thickness of the battery cell group is the sum of M Xs, defined as A. There are N foams provided in the foam group. It is set that the thickness of each foam in the initial state is Y. Correspondingly, the initial thickness of the foam group is the sum of N Ys, defined as B. After the processing of the battery module provided by the present invention, the thickness of the battery module is H, and this H < (A + B). That is, by squeezing the metal housing 1, the metal housing 1 provides a continuous squeezing force to the battery cell group and the foam group arranged in its accommodation cavity 3, so that the metal housing 1 can apply a certain pre-tightening force to the battery cell group, making the battery cell group and the foam group in the accommodation cavity 3 in a compressed state.

[0036] Furthermore, in order to enable each battery cell 2 located in the metal housing 1 to obtain a uniform pre-tightening force, the thickness H of the battery module provided by the present invention = (h1 + h2) + A + (60% - 90%)B; where h1 is the thickness of the first housing 11 and h2 is the thickness of the second housing 12. That is, the compression amount of the thickness H of the battery module being less than the sum of the initial thickness of the foam group and the initial thickness of the battery cell group comes from the compression of the foam group. When the thickness of the foam group is compressed to 60% - 90% of the initial thickness B, the pressing force on the foam can be converted into the pre-tightening force of the foam on the battery cell 2. By each foam in the foam group providing a continuous and effective pre-tightening force to the adjacent battery cell 2, the purpose of controlling the pre-tightening force of each single battery cell 2 in the battery module is achieved.

[0037] In a more preferred embodiment, when the thickness H of the battery module is H=(h1 + h2)+A+(70%)B, the pre-tightening force generated by the foam on the battery cell 2 is most appropriate. It can not only achieve the continuous pre-tightening force of the foam on the expansion and contraction of the battery cell 2 during the effective cycle times of charging and discharging of the battery cell 2, but also enable the foam to maintain the best resilience and more continuous cycle times of compression and rebound in its working state. Moreover, during the charging and discharging process of the battery module, if the battery cell 2 continuously expands, it will continuously compress the foam, causing its overall thickness to decrease. Generally, when the battery cell 2 expands to the limit, the thickness of the foam group is 55%-60% of the initial thickness. When the battery cell 2 retracts during charging and discharging, the compressed part of the foam will rebound accordingly, continuously adhering to the outer surface of the battery cell, and providing a supporting force for the retraction of the battery cell 2. After the retraction of the battery cell 2 is completed, it returns to the designed thickness H of the battery module.

[0038] In one embodiment, the number of cells 2 in the cell group is 3, the corresponding number of first foams 4 is 2, the number of second foams 5 is 1, and the number of third foams 6 is 1. The number of first double-sided adhesive layers on a single first foam 4 is 2, the second double-sided adhesive layer on a single second foam 5 is 1, and the number of third double-sided adhesive layers on a single third foam 6 is 1. The original thicknesses of the respective structures before the cell 2 expands are as follows: the original thickness of a single cell 2 is 11.7 mm, the original thickness of a single first foam 4 is 1.5 mm, the original thickness of a single second foam 5 is 1 mm, the original thickness of a single third foam 6 is 1 mm, the original thickness of a single first double-sided adhesive layer is 0.05 mm, the original thickness of a single second double-sided adhesive layer is 0.05 mm, and the original thickness of a single third double-sided adhesive layer is 0.05 mm. At the same time, the size of the accommodation cavity 3 in the thickness direction of the cell 2 is 39.9 mm, that is, after the metal shell 1 is wrapped around the cell 2, the total compression amount of the first foam 4, the second foam 5, and the third foam 6 under the pre-tightening force of the metal shell 1 is 0.5 mm, and the pre-compression ratio of the foam group before the cell 2 expands is 0.5 / (1 + 1.5 + 1.5 + 1) = 10%. According to experimental measurements, when the foam group is compressed by 10%, the pressure corresponding to the pre-tightening force applied by the metal shell 1 is approximately 0.035 Mpa. In addition, after the cell 2 expands, the thickness of the cell 2 is 12.5 mm, and the total compression amount of the first foam 4, the second foam 5, and the third foam 6 under the restraint of the metal shell 1 is 2.9 mm. The compression ratio of the foam group after the cell 2 expands is 2.9 / (1 + 1.5 + 1.5 + 1) = 58%. According to experimental measurements, when the foam group is compressed by 58%, the pressure corresponding to the pre-tightening force applied by the metal shell 1 is approximately 0.147 Mpa. During compression, the internal forces of the system received by each foam are equal, and the compression ratios of each foam are also the same. It can be seen from this that during the expansion and contraction of the cell 2, although the pressure exerted by the metal shell 1 on the cell 2 and the foam changes, and although the compression ratio of the foam changes, the pre-tightening force received by each cell 2 is uniform. Therefore, the performance and stability of the battery module can be well guaranteed. At the same time, according to experiments, when fully charged, the compression ratio of the foam is about 60%. At the same time, the pre-tightening force received by the cell 2 during the whole process should not be too large or too small. Therefore, in this embodiment, the optimal dimensions of the above-mentioned respective structures are obtained through multiple verifications. Among them, the foam is preferably silicone foam or EPDM foam, and the double-sided adhesion is preferably Stick DS-5.

[0039] In one embodiment, the thickness of the first foam 4 is greater than or equal to the thickness of the second foam 5; the thickness of the first foam 4 is greater than or equal to the thickness of the third foam 6. The first foam 4 is disposed between the first shell 11 of the metal housing 1 and the battery cell group, and the second foam 5 is disposed between the second shell 12 of the metal housing 1 and the battery cell group. In this embodiment, the thickness of the first foam 4 is equal to the thickness of the second foam 5, and the thickness of the first foam 4 is greater than the thickness of the third foam 6. With such a setting, the first foam 4 and the second foam 5 located outside the entire battery cell group are subjected to a greater pressing force from the metal housing 1 on both sides towards the center, and their thickness is greater than that of the third foam 6 located inside the battery cell group, absorbing more deformation.

[0040] In one embodiment, the battery module further includes an adhesive group, and the adhesive group includes a plurality of first double-sided adhesive layers disposed between the battery cells 2 and the first foam 4, a second double-sided adhesive layer disposed between the first shell 11 and the second foam 5, and a third double-sided adhesive layer disposed between the second shell 12 and the third foam 6. In this embodiment, the first double-sided adhesive layer, the second double-sided adhesive layer, and the third double-sided adhesive layer are preferably double-sided tapes. The battery cells 2 adjacent to the first foam 4 are bonded to the first foam 4 through the first adhesive layer; the first shell 11 is bonded to the second foam 5 through the second adhesive layer; the second shell 12 is bonded to the third foam 6 through the third adhesive layer, so that the first shell 11, the second shell 12, and the foam group form a whole. During the expansion and contraction of the battery cells 2, the setting of the adhesive group bonds adjacent components together, preventing misalignment between adjacent components, so that the metal housing 1 can continuously apply a pre-tightening force to the battery cell group, thereby ensuring the safety and stability of the battery module.

[0041] In one embodiment, the number of battery cells 2 in the battery cell group is 3 - 15. When the number of battery cells 2 in the battery cell group is other numbers, it is also within the protection scope of this embodiment. Preferably, the number of battery cells 2 in the battery cell group is three, so that the metal housing 1 can achieve a better pre-tightening effect on the battery cells 2.

[0042] In one embodiment, the first shell 11 of the metal housing 1 includes a first bottom plate 7 and first side plates 111 connected to opposite sides of the first bottom plate 7. The second shell 12 includes a second bottom plate 8 and second side plates 121 connected to opposite sides of the second bottom plate 8. The first bottom plate 7 and the second bottom plate 8 are spaced apart. The first side plates 111 are bent towards the second bottom plate 8, and the second side plates 121 are bent towards the first bottom plate 7. The second side plates 121 are welded to the outer side surfaces of the first side plates 111, and an accommodation cavity 3 is formed inside the first shell 11 and the second shell 12.

[0043] In one embodiment, the battery bracket 9 has an outlet channel 91 matching the battery cell group, and the outlet channel 91 communicates with the accommodation cavity 3.

[0044] In one embodiment, the metal housing 1 is provided with positioning notches 10 on the first side plate 111 and the second side plate 121, and the side surface of the battery bracket 9 is provided with positioning grooves, and the positioning grooves of the battery bracket 9 communicate with the positioning notches 10 of the metal housing 1.

[0045] In one embodiment, the battery module further includes two metal plates 13 disposed between the first side plate 111 of the metal housing 1 and the battery cell group. The metal plate 13 is disposed on the outer side surface of the battery cell group of the entire battery module, that is, in the thickness direction of the battery cell group. The two end portions of the metal plate 13 are respectively inserted into the positioning grooves of the battery bracket 9 at the openings on both sides of the metal housing 1. The metal plate 13 is located between the first side plate 111 of the metal housing 1 and the battery cell group, and the metal plate 13 is located at the welding joint of the first housing 11 and the second housing 12 of the metal housing 1. When the first housing 11 and the second housing 12 are welded, the metal plate 13 can not only play a role in supporting and fixing the welding of the metal housing 1, but also prevent the welding laser from penetrating the metal housing 1 during the welding process, avoiding damage to the battery cell group caused by welding. The width of the metal plate 13 should be greater than the width of the overlapping portion of the first side plate 111 of the first housing 11 and the second side plate 121 of the second housing 12 on the outer side surface of the battery cell group. The thickness of the metal plate 13 is 0.3 mm to 1.2 mm. The thickness of the metal plate 13 is greater than or equal to the thickness of the metal housing 1, ensuring that while providing support for the welding position of the metal housing 1, it can also prevent the welding laser from penetrating. In this embodiment, the metal plate 13 can prevent the protection of the battery cell 2 from being affected by the welding of the first housing 11 and the second housing 12. Among them, according to the different battery cells 2, the thickness of the metal plate 13 can be appropriately adjusted.

[0046] At the same time, in one embodiment, the battery module further includes two insulating plates 14 disposed between the metal plate 13 and the battery cell group. Through the insulating plates 14, it is possible to prevent the battery cell group from directly contacting the metal housing 1 in the thickness direction of the battery cell group, which can better prevent the short circuit of the battery cell group.

[0047] For the battery module according to this embodiment, through the metal housing 1, a certain pre-tightening force can be applied to the limitedly stacked battery cells in the battery cell group in the thickness direction of the battery cell group by using the clamping force of the metal housing 1. At the same time, the foam group has high resilience. When the battery cell group expands in its thickness direction, the foam group is squeezed and shrinks, ensuring that all the battery cells 2 in the battery cell group can be uniformly subjected to the pre-tightening force provided by the metal housing 1 and the foam group, so that the battery cells 2 can effectively retract; when the battery cell group shrinks from the expanded state towards the original state, the foam group will correspondingly rebound, continuously providing sufficient pre-tightening force for the battery cells 2 in the battery cell group, ensuring that each battery cell 2 can return to the original state during the limited number of expansion and retraction processes. Through the mutual cooperation of the metal housing 1 and the foam group, each battery cell 2 in the battery cell group can be uniformly and continuously subjected to the pre-tightening force throughout the entire charge and discharge process, ensuring that each single battery cell 2 can be uniformly and continuously subjected to the pre-tightening force during the limited number of cyclic uses, enabling the electrical performance of each single battery cell 2 to remain basically consistent, thereby effectively improving the safety, stability and service life of the entire battery module.

[0048] In addition, as Figure 6 shown, an embodiment of the present invention provides a processing method for a battery module, including the following steps:

[0049] Stacking step: Stack the battery cell group and the foam group in sequence along the thickness direction of the battery cell group to form a stacked group;

[0050] Housing installation step: Place the first housing 11 and the second housing 12 on both sides of the stacked group respectively;

[0051] Bracket installation step: Install two battery brackets 9 at the opening enclosed by the first housing 11 and the second housing 12 respectively;

[0052] Clamping step: Push the first housing 11 and the second housing 12 to move towards each other so that the first housing 11 and the second housing 12 are butted to form the metal housing 1;

[0053] Welding step: Weld and fix the first housing 11 and the second housing 12 on the side surfaces in the length direction of the battery cell group through welding equipment.

[0054] It further includes an adhesive step before the stacking step, attaching double-sided tape to the outer side surface of each battery cell 2 so as to form an adhesive layer between the battery cell group and the stacked group;

[0055] It further includes a pre-installation step before the housing installation step, fixing insulating plates on both side surfaces in the thickness direction of the battery cell group, and fixing metal plates 13 outside the insulating plates.

[0056] According to the processing method of the battery module of the present embodiment, the first shell 11 and the second shell 12 moving towards each other clamp the stacking group, and the metal shell 1 is welded in the length direction of the battery cell group, so that the battery cell group can be subjected to uniform and continuous pre-tightening force during the entire charging and discharging process. Furthermore, the battery cell group can effectively expand and contract during use, ensuring the safety and stability of the battery cell group during the process of cyclic use.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery module, characterized in that, It includes a metal housing, a battery cell group, a foam group and two battery brackets. An accommodation cavity is formed inside the metal housing, and the battery cell group and the foam group are arranged in the accommodation cavity; The metal housing has a first shell and a second shell oppositely arranged in the thickness direction of the battery cell group, The first shell and the second shell form two openings communicating with the accommodation cavity in the width direction of the battery cell group, and the two battery brackets respectively cover the openings, After the first shell and the second shell are welded and fixed in the length direction of the battery cell group, they provide a clamping pre-tightening force to the battery cell group and the foam group located therein.

2. The battery module according to claim 1, characterized in that, The battery cell group includes a plurality of battery cells stacked along its thickness direction, and the foam group includes a plurality of first foams arranged between two adjacent battery cells, a second foam arranged between the first shell and the battery cell group, and a third foam arranged between the second shell and the battery cell group.

3. The battery module according to claim 2, characterized in that, It further includes an adhesive group, and the adhesive group includes a plurality of first double-sided adhesive layers arranged between the battery cells and the first foam, a second double-sided adhesive layer arranged between the first shell and the second foam, and a third double-sided adhesive layer arranged between the second shell and the third foam.

4. The battery module according to claim 1, characterized in that, The thickness of the battery module is less than the sum of the initial thickness of the foam group and the initial thickness of the battery cell group.

5. The battery module according to claim 1, characterized in that, The number of battery cells in the battery cell group is 3 - 15.

6. The battery module according to claim 1, characterized in that, The first shell of the metal housing includes the first bottom plate and first side plates connected to opposite sides of the first bottom plate. The second shell includes the second bottom plate and second side plates connected to opposite sides of the second bottom plate. The first bottom plate and the second bottom plate are spaced apart. The first side plate bends towards the second bottom plate, and the second side plate bends towards the first bottom plate; the second side plate is welded to the outer side surface of the first side plate, and the accommodation cavity is formed inside the first shell and the second shell.

7. The battery module according to claim 6, characterized in that, The battery bracket has an outlet channel matching the battery cell group, and the outlet channel communicates with the accommodation cavity.

8. The battery module according to claim 6, characterized in that, The metal housing is provided with positioning notches on the first side plate and the second side plate, and the side surface of the battery bracket is provided with positioning grooves, and the positioning grooves of the battery bracket communicate with the positioning notches of the metal housing.

9. The battery module according to claim 6, characterized in that, The battery module further includes two metal plates arranged between the first side plate of the metal housing and the battery cell group, and the thickness of the metal plate is 0.3 mm - 1.2 mm.

10. A processing method for manufacturing the battery module according to any one of claims 1-9, characterized in that, It includes the following steps: Stacking step: Stack the battery cell group and the foam group in sequence along the thickness direction of the battery cell group to form a stacked group; Housing installation step: Place the first shell and the second shell on both sides of the stacked group respectively; Bracket installation step: Install the two battery brackets at the openings enclosed by the first shell and the second shell respectively; Clamping step: Push the first shell and the second shell to move towards each other so that the first shell and the second shell are butted to form the metal housing; Welding step: Weld and fix the side surfaces of the first shell and the second shell in the length direction of the battery cell group through welding equipment.

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