Spacer, power battery and battery module

Abstract

In order to overcome the problem in the prior art that power batteries generate vibrations during use, which affects the positioning and stability of the battery cells in the shell, the present invention provides a spacer, a power battery, and a battery module; the spacer includes a support portion symmetrically arranged along the center and a partition provided between the two support portions, the support portion includes a base plate and a plurality of grilles, the grilles include a plurality of support plates and a side plate provided on the base plate to connect the plurality of support plates; a first air vent is provided on the support plate, and an injection groove that interfaces with the injection hole and a non-injection groove that does not interface with the injection hole are formed between two adjacent support plates and the side plate. The spacer provided by the present invention is provided with a gap, so that the tabs pass through the gap to clamp and limit the tabs, and then the spacer is used to fix the position of the battery cell during assembly, thereby avoiding displacement caused by vibration during subsequent use of the power battery and improving the stable positioning of the battery cell in the shell.

Description

Technical Field

[0001] The present invention belongs to the technical field of power battery manufacturing, and in particular relates to a spacer, a power battery and a battery module. Background Art

[0002] Power batteries, with their high energy density and long life, are widely used in electric vehicles, backup power systems, microgrid energy storage systems, and other fields. Taking lithium-ion batteries as an example, existing lithium-ion batteries mainly have two structures: prismatic lithium-ion batteries and pouch lithium-ion batteries.

[0003] In the prior art, the main structural components of a power battery include a positive electrode, a negative electrode, and a metal shell. First, a battery cell is prepared by stacking the positive electrode and the negative electrode, and then the battery cell is assembled into a shell and injected with liquid. Since the power battery includes the aforementioned multiple metal structural components, when there are large gaps between the assembled multiple structural components of the power battery, the power battery will vibrate during use, causing the position of the battery cell in the shell to move and contact with the metal shell or other metal structural components, affecting the combined positioning between the battery cell and the metal structural components, posing a great safety hazard during the use of the power battery. Summary of the Invention

[0004] Aiming at the problem in the prior art that power batteries generate vibration during use, which affects the positioning and stability of the battery cells in the housing, a spacer, a power battery and a battery module are provided.

[0005] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0006] In one aspect, the present invention provides a spacer, comprising two support portions symmetrically arranged along the center and a partition disposed between the two support portions, wherein a gap is provided on the partition along its thickness direction for allowing a tab of a power core to pass through, and the width of the gap is 0.1-0.35 times the width of the partition;

[0007] The support portion includes a base plate and a plurality of grilles arranged on the base plate, the grilles include a plurality of support plates arranged on the top surface of the base plate and spaced apart along its length direction, and a side plate arranged on the base plate to connect the plurality of support plates; a first air vent is provided on the support plate, and an injection groove that docks with the injection hole of the battery and a non-injection groove that does not dock with the injection hole of the battery are formed between two adjacent support plates and the side plate.

[0008] Optionally, the partition has two first side edges and a second side edge arranged parallel to each other along its length direction, the side panel includes a first side panel flush with the first side edge and a second side panel flush with the second side edge, and the second side panel is further provided with a second air vent between two adjacent support plates.

[0009] Optionally, the distance between the gap and the first side is 0.4-0.86 times the width of the partition.

[0010] Optionally, the gap divides the partition into a first connecting plate located on the first side and a second connecting plate located on the second side, the first connecting plate is provided with a first chamfer at the bottom surface on the side opposite to the second connecting plate, the second connecting plate is provided with a second chamfer at the bottom surface on the side opposite to the first connecting plate, and the first chamfer is larger than the second chamfer.

[0011] Optionally, the first chamfer angle is 145°-160°, and the second chamfer angle is 105°-130°.

[0012] Optionally, the spacing between adjacent support plates of the grid is the same, and the spacing between adjacent support plates is 2-3 times the diameter of the liquid injection hole of the battery.

[0013] Optionally, the spacing between adjacent support plates of the grid is different, the spacing between the two support plates at the injection groove is 2-5 times the aperture of the injection hole of the battery, and the spacing between the two support plates at the non-injection groove is smaller than the spacing between the two support plates at the injection groove.

[0014] Optionally, the substrate of the supporting part includes a horizontal plate and an inclined plate connecting the horizontal plate and the partition, the horizontal plate and the partition are arranged parallel to each other in the thickness direction, an avoidance area is formed between the inclined plate and the partition, and the grille is arranged on the top of the horizontal plate and the inclined plate.

[0015] Optionally, an included angle α formed between the inclined plate and the horizontal plate is 105°-125°.

[0016] Optionally, the support portion further includes an arc-shaped protruding block surrounding the base plate, the arc-shaped protruding block is connected to the first side plate of the grille to form an enclosed area, and the enclosed area protrudes from the surface of the horizontal plate.

[0017] Optionally, the spacer also includes a liquid through hole arranged on the horizontal plate of the support part, and in the non-liquid injection groove, the liquid through hole connects two adjacent support plates in the horizontal direction, and in the vertical direction, the liquid through hole passes through the horizontal plate and extends to the support plate; in the liquid injection groove, the liquid through hole of the horizontal plate is close to the support plate, and the edge distance of the liquid through hole is 0.7-0.8 times the aperture of the liquid injection hole from the center of the liquid injection groove.

[0018] Optionally, the support plate of the grille has an arc angle at an edge position on one side away from the side.

[0019] Optionally, the partition and the support portion are integrally injection molded, and the material of the spacer includes one of PP material, PE material, polyimide material and epoxy resin material.

[0020] On the other hand, the present invention provides a power battery, including an integrated battery frame, a battery cell with a tab arranged in the integrated battery frame, and the spacer arranged in the integrated battery frame, the integrated battery frame including a metal frame, a pole arranged on the metal frame, an injection hole and an explosion-proof valve, and the spacer is located between the metal frame and the battery cell.

[0021] Optionally, the battery cell is provided with the pole tabs at both ends along its length direction, the power battery includes two spacers, and the two spacers are respectively provided at both ends of the battery cell having the pole tabs, and the pole tabs pass through the gap and are welded and fixed to the poles of the integrated battery frame.

[0022] Optionally, the bottom surface of the substrate abuts against the end of the battery cell, and the support plate is located between the metal frame and the battery cell.

[0023] Optionally, the power battery further includes an insulating film disposed in the integrated battery frame and covering the outside of the battery cell, the insulating film extending along the length direction of the battery cell, and both ends of the insulating film are respectively connected to the spacer by heat melting.

[0024] Optionally, the power battery also includes a shell cover assembly, which includes a first shell cover and a second shell cover, and the first shell cover and the second shell cover are respectively located on two sides of the integrated battery frame, and together with the metal frame of the integrated battery frame, form a accommodating area for fixing the battery cell and the spacer.

[0025] On the other hand, the present invention provides a battery module comprising the power battery.

[0026] The beneficial effects of the present invention are:

[0027] The spacer provided by the present invention, during the assembly of the power battery, on the one hand, clamps and limits the tabs on the battery cell by passing the tabs through the gap, and uses the spacer to fix the position of the battery cell during assembly, thereby avoiding vibration problems during subsequent use of the power battery and avoiding contact between the tabs of the battery cell and other metal structural parts in the battery, thereby effectively improving the stability of the positioning of the battery cell in the shell; on the other hand, the side of the support portion facing away from the battery cell contacts with other assembly parts of the power battery, reducing the assembly gap, and the support portion can also play a good supporting role in the assembly of the power battery, avoiding squeezing of the tabs and the battery cell by other assembly parts of the power battery; in addition, a first air vent is provided on the support portion of the spacer, which is conducive to exhaust and heat dissipation and increases the safety performance of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic diagram of the spacer structure provided by the present invention;

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of the spacer provided by the present invention;

[0030] Figure 3 This is a schematic diagram of the integrated battery frame structure provided by the present invention;

[0031] Figure 4 This is a schematic structural diagram of the metal frame and pole assembly provided by the present invention;

[0032] Figure 5 This is a schematic diagram of the power battery structure provided by the present invention;

[0033] Figure 6 is a schematic cross-sectional view of the power battery provided by the present invention;

[0034] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0035] Figure 8 This is an exploded view of the power battery provided by the present invention.

[0036] The reference numerals in the drawings of the specification are as follows:

[0037] 1. Support part; 11. Base plate; 111. Grille; 1111. Support plate; 1112. First side plate; 1113. Second side plate; 12. Horizontal plate; 13. Inclined plate; 14. Arc raised block; 2. Partition; 3. Gap; 4. Liquid injection groove; 5. Non-liquid injection groove; 6. Second connecting plate; 61. Second chamfer; 7. First connecting plate; 71. First chamfer; 8. Integrated battery frame; 81. Battery cell; 82. Pole; 83. Liquid injection hole; 84. Explosion-proof valve; 85. Metal frame; 9. Tab; 10. Insulating film; 15. Shell cover assembly; 151. First shell cover; 152. Second shell cover; 16. Spacer; 17. Liquid passage hole; 18. First air vent; 19. Second air vent. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] Reference Figure 1-2 The present invention provides a spacer 16, which includes two support portions 1 symmetrically arranged along the center and a partition 2 arranged between the two support portions 1. The partition 2 is provided with a gap 3 along its thickness direction for the tab 9 of the power core 81 to pass through. The width of the gap 3 is 0.1-0.35 times the width of the partition 2.

[0042] The support portion 1 includes a substrate 11 and a plurality of grilles 111 arranged on the substrate 11, the grilles 111 include a plurality of support plates 1111 arranged on the top surface of the substrate 11 and spaced apart along its length direction, and a side plate arranged on the substrate 11 to connect the plurality of support plates 1111; a first air vent 18 is provided on the support plate, and an injection groove 4 that docks with the injection hole 83 of the battery and a non-injection groove 5 that does not dock with the injection hole 83 of the battery are formed between two adjacent support plates 1111 and the side plate.

[0043] The spacer 16 provided by the present invention, during the assembly of the power battery, on the one hand, the pole ear 9 on the battery cell 81 is clamped and limited by the operation of passing the pole ear 9 through the gap 3, and the spacer 16 is used to fix the position of the battery cell 81 during assembly, thereby avoiding vibration problems during subsequent use of the power battery, thereby effectively improving the stability of the positioning of the battery cell 81 in the shell; on the other hand, the side of the support part 1 facing away from the battery cell 81 is in contact with other assembly parts of the power battery, reducing the assembly gap 3, and the support part 1 can also play a good supporting role in the assembly of the power battery, thereby avoiding squeezing of the pole ear 9 and the battery cell 81 by other assembly parts of the power battery; in addition, a liquid injection groove 4 and a non-liquid injection groove 5 are formed on the support part 1 of the spacer 16. Compared with the setting of the liquid injection hole 83 in the prior art, the liquid injection groove 4 of the present application is simple and easy to operate. In addition, a first air vent 18 is provided on the support part of the spacer, which is conducive to exhaust and heat dissipation and increases the safety performance of the power battery.

[0044] The gap 3 set on the partition 2 along its thickness direction is mainly used for the insertion of the tab 9 of the battery cell 81. In this application, the width of the gap 3 is set to 0.1-0.35 times the width of the partition 2, with the purpose of better clamping the tab 9 to limit the battery cell 81. When the width of the gap 3 is less than 0.1 times the width of the partition 2, the gap 3 is too small and the tab is easily squeezed. When the width of the gap 3 is greater than 0.35 times the width of the partition 2, the width of the gap 3 is too large, the structural strength of the partition is insufficient, and the tab cannot be well supported. In addition, in the specific preparation, the width of the gap 3 can be set according to the thickness of the tab 9 to be clamped, so as to realize the insertion of the tab 9 and play a clamping and fixing role.

[0045] In some embodiments, the partition 2 has two first side edges and a second side edge arranged parallel to each other along its length direction, and the side panel includes a first side panel 1112 flush with the first side edge and a second side panel 1113 flush with the second side edge, and the second side panel 1113 is also provided with a second air vent 19 between the two adjacent support plates.

[0046] Specifically, the second air holes 19 provided on the second side plate 1113 can also provide a good exhaust and heat dissipation channel for the power battery.

[0047] Reference Figure 3 In some embodiments, the distance between the gap 3 and the first side is 0.4-0.86 times the width of the partition 2.

[0048] Specifically, in order to ensure the connection between the pole lug 9 and other structural parts, the pole lug 9 is offset in the gap 3 in the present application. After the offset, the pole lug 9 is deflected toward the direction close to the first connecting plate 7 after passing through the gap 3. At the same time, in order to avoid assembly extrusion, it is necessary to set an appropriate distance between the gap 3 and the first side of the first connecting plate 7. That is, when the distance between the gap 3 and the first side is 0.4-0.86 times the width of the partition 2, it can not only meet the offset requirement of the pole lug 9 but also avoid assembly extrusion.

[0049] Reference Figure 7 In some embodiments, the gap 3 divides the partition 2 into a first connecting plate 7 located on the first side and a second connecting plate 6 located on the second side, the first connecting plate 7 is provided with a first chamfer 71 at the bottom surface on the side opposite to the second connecting plate 6, and the second connecting plate 6 is provided with a second chamfer 61 at the bottom surface on the side opposite to the first connecting plate 7, and the first chamfer 71 is larger than the second chamfer 61.

[0050] Specifically, the first connecting plate 7 located on the first side and the second connecting plate 6 located on the second side together constitute the gap 3. A first chamfer 71 is provided on the bottom surface of the first connecting plate 7 on the side opposite to the second connecting plate 6, and a second chamfer 61 is provided on the bottom surface of the second connecting plate 6 on the side opposite to the first connecting plate 7. The setting of the first chamfer 71 and the second chamfer 61 prevents the first connecting plate 7 or the second connecting plate 6 with sharp edges from damaging the pole ear 9 passing through the gap 3.

[0051] Specifically, in the battery structure provided by the present invention, in order to ensure the connection between the pole lug 9 and other structural parts, the pole lug 9 is biased here, that is, the pole lug 9 is tilted toward the direction close to the first connecting plate 7 after passing through the gap 3, and the angle of the first chamfer 71 is set to be greater than the angle of the second chamfer 61, which is beneficial to avoid the first connecting plate 7 from being decompressed and touching the pole lug 9; in addition, compared with the first chamfer 71, the second chamfer 61 is set smaller, which is beneficial to form a relatively stable clamping position for the pole lug 9, improve the stability of the assembly of the battery cell 81, and at the same time reduce space waste, improve space utilization, and thus increase battery capacity or reduce battery size, improve battery electrical performance and reduce costs.

[0052] In some embodiments, the first chamfer 71 is 145°-160°, and the second chamfer 61 is 105°-130°.

[0053] Specifically, the first chamfer 71 can be 145°, 150°, 155° or 160°, and the second chamfer 61 can be 105°, 110°, 115°, 120°, 115°, 120°, 125° or 130°. It should be noted that, when the first side plate 1112 and the second side plate 1113 do not touch or extrude the tab 9 during the process of passing the gap 3 through the tab 9, the specific angles of the first chamfer 71 and the second chamfer 61 can be set according to the actual preparation parameters.

[0054] In some embodiments, the spacing between adjacent support plates 1111 of the grid 111 is the same, and the spacing between adjacent support plates 1111 is 2-3 times the diameter of the liquid injection hole 83 of the battery.

[0055] Specifically, the same spacing between adjacent support plates 1111 of the grid 111 is provided, which is beneficial to providing uniform and balanced support force during battery installation and avoiding squeezing of structural parts due to uneven force; the spacing between adjacent support plates 1111 is 2-3 times the aperture of the battery's injection hole 83, that is, the spacing between adjacent support plates 1111 is greater than the aperture of the injection hole 83. This arrangement is beneficial to the injection and circulation of electrolyte.

[0056] In some embodiments, the spacing between adjacent support plates 1111 of the grid 111 is different, the spacing between the two support plates 1111 at the injection groove 4 is 2-5 times the aperture of the injection hole 83 of the battery, and the spacing between the two support plates at the non-injection groove is smaller than the spacing between the two support plates at the injection groove.

[0057] Specifically, the distance between the two support plates 1111 forming the liquid injection groove 4 is slightly larger than the distance between the two support plates 1111 forming the non-liquid injection groove 5, so that the electrolyte injected through the liquid hole has enough space to flow.

[0058] In some embodiments, the substrate 11 of the support portion 1 includes a horizontal plate 12 and an inclined plate 13 connecting the horizontal plate 12 to the partition 2. The horizontal plate 12 and the partition 2 are arranged parallel to each other in the thickness direction, and an avoidance area is formed between the inclined plate 13 and the partition 2. The grille 111 is arranged on the top of the horizontal plate 12 and the inclined plate 13.

[0059] Specifically, a relief zone is formed between the inclined plate 13 and the partition 2 , which avoids the initial lead-out end of the tab 9 , thereby preventing the end of the support portion 1 close to the tab 9 from contacting and squeezing the tab 9 .

[0060] In some embodiments, the angle α between the inclined plate 13 and the horizontal plate 12 is 105°-125°.

[0061] Specifically, the angle between the inclined plate 13 and the horizontal plate 12 can be 105°, 110°, 115°, 120° or 125°; it should be noted that when the avoidance zone avoids the initial lead-out end of the tab 9, the specific angle between the inclined plate 13 and the horizontal plate 12 can be set according to the actual preparation parameters.

[0062] In some embodiments, the support portion 1 further includes an arc-shaped protruding block 14 surrounding the base plate 11 , and the arc-shaped protruding block 14 is connected to the first side plate 1112 of the grille 111 to form an enclosed area, and the enclosed area protrudes from the surface of the flat plate.

[0063] Specifically, the arc-shaped protrusion block 14 is connected to the grid 111 to form an enclosed area. The enclosed area protrudes from the surface of the horizontal plate to enclose the injected electrolyte, allowing the electrolyte to flow into the interior of the battery through the liquid hole 17 on the spacer 16 for infiltration, thereby preventing the electrolyte from flowing out.

[0064] In some embodiments, the spacer 16 also includes a liquid through hole provided on the horizontal plate of the support portion, wherein in the non-liquid injection groove, the liquid through hole connects two adjacent support plates in the horizontal direction, and in the vertical direction, the liquid through hole passes through the horizontal plate and extends to the support plate; in the liquid injection groove, the liquid through hole of the horizontal plate is close to the support plate, and the edge distance of the liquid through hole is 0.7-0.8 times the aperture of the liquid injection hole from the center of the liquid injection groove.

[0065] The provision of the liquid-passing hole facilitates the flow of the electrolyte. In addition, when the liquid is injected, the pressure is high, and the liquid-passing hole is not provided at the position of the substrate 11 corresponding to the injection groove 4 to avoid excessive injection pressure from damaging the battery cell 81.

[0066] In some embodiments, the support plate 1111 of the grille 111 has an arc angle at an edge position on one side away from the side.

[0067] Specifically, the setting of the arc angle on the edge can avoid puncturing and damaging the insulating film 10, and at the same time can effectively reduce the friction between the battery cell 81 and the battery shell, thereby avoiding damage to the battery cell 81.

[0068] In some embodiments, the partition 2 and the support portion 1 are integrally injection-molded, and the material of the spacer 16 includes one of PP material, PE material, polyimide material and epoxy resin material.

[0069] Specifically, the partition 2 and the support part 1 are integrally injection molded, which is beneficial to reducing the number of components, simplifying the production process, and reducing production costs. By integrating the spacer 16 with the support part 1, additional assembly steps and possible human operation errors are avoided, thereby improving the accuracy of power battery assembly and product consistency.

[0070] Specifically, the spacer 16 formed by the partition 2 and the support portion 1 is an insulating member, which can provide good insulation effect. In addition to the above-mentioned insulating materials, the spacer 16 can also be made of other materials with insulating effects, which are not specifically limited.

[0071] Reference Figure 4-6 Another embodiment of the present invention provides a power battery, including an integrated battery frame 8, a battery cell 81 with a tab 9 arranged in the integrated battery frame 8, and the spacer 16 arranged in the integrated battery frame 8, the integrated battery frame 8 includes a metal frame 85, a pole 82 arranged on the metal frame 85, a liquid injection hole 83 and an explosion-proof valve 84, and the spacer 16 is located between the metal frame 85 and the battery cell 81.

[0072] Specifically, in the power battery provided by the present invention, the spacer 16 is arranged between the metal frame 85 and the battery cell 81 during assembly, so that the spacer 16 can occupy and fill the assembly gap 3 generated during the assembly process of the metal frame 85 and the battery cell 81, thereby improving the stability of the overall structural assembly of the power battery, alleviating and improving the vibration generated during the use of the power battery and the displacement of the battery cell 81.

[0073] Specifically, compared with the prior art, the present application connects the pole 82 to the metal frame 85 to facilitate connection with the pole lug 9 passing through the gap 3 , which is beneficial to reducing connection impedance.

[0074] Specifically, the metal frame 85 can be obtained by bending and welding, and the welding can be achieved by friction welding or laser welding or a combination of the two.

[0075] Reference Figure 8 In some embodiments, the battery cell 81 is provided with the pole tabs 9 at both ends along its length direction, the power battery includes two spacers 16, and the two spacers 16 are respectively provided at the two ends of the battery cell 81 having the pole tabs 9, and the pole tabs 9 pass through the gap 3 and are welded and fixed to the pole posts 82 of the integrated battery frame 8.

[0076] Specifically, in the design of the power battery, tabs 9 are provided at both ends of the battery cell 81. The tabs 9 are an important part for connecting the battery to the external circuit. The tabs 9 extend through the gap 3 in the spacer 16 and are connected to the poles 82 on the battery frame by welding. This structural design can effectively ensure the mechanical fixation of the battery cell 81 in the power battery and the stability of the electrical connection, reducing poor contact due to vibration or impact.

[0077] In some embodiments, the bottom surface of the substrate 11 abuts against the end of the battery cell 81 , and the support plate 1111 is located between the metal frame 85 and the battery cell 81 .

[0078] Specifically, the bottom surface of the substrate 11 abuts against the end of the battery cell 81, which is conducive to achieving stable connection and mechanical support of the battery cell 81 by the spacer 16. The support plate 1111 is set between the metal frame 85 and the battery cell 81 to prevent poor contact or structural displacement due to vibration or impact during the use of the power battery.

[0079] In some embodiments, the power battery further includes an insulating film 10 disposed in the integrated battery frame 8 and wrapped around the outside of the battery cell 81 . The insulating film 10 extends along the length direction of the battery cell 81 , and the two ends of the insulating film 10 are respectively connected to the spacer 16 by thermal melting.

[0080] Specifically, in the structure of the battery, the insulating film 10 is an important safety component used to isolate the battery cell 81 from other parts of the battery to prevent short circuits and play a role in stabilizing the structure; during the assembly of the power battery, the two ends of the insulating film 10 are connected to the spacer 16 through hot melt technology, and the contact surface between the insulating film 10 and the spacer 16 is melted by high temperature, and a strong bond is formed after cooling, which can effectively prevent the insulating film 10 from shifting or peeling off.

[0081] Specifically, the insulating film 10 is usually made of a heat-resistant material. The insulating film 10 provided in the present application is made of a material selected from polyester (PET) or polypropylene (PP).

[0082] In some embodiments, the power battery also includes a shell cover assembly 15, which includes a first shell cover 151 and a second shell cover 152. The first shell cover 151 and the second shell cover 152 are respectively located on two sides of the integrated battery frame 8, and together with the metal frame 85 of the integrated battery frame 8, form a accommodating area for fixing the battery cell 81 and the spacer 16.

[0083] Specifically, the metal frame 85 serves as the main body supporting the power battery. The head and tail ends of the metal frame 85 are bent and welded to form a hollow frame structure. The first shell cover 151 and the second shell cover 152 are used to close the two ends of the metal frame 85 to form a sealed accommodating area, which accommodates the battery cell 81 and the spacer 16. Through the coordinated connection between the metal frame 85 and the first shell cover 151 and the second shell cover 152, the processing difficulty of the shell cover assembly 15 can be reduced, the dimensional processing accuracy of the shell cover assembly 15 can be improved, and the production cost of the shell cover assembly 15 can be reduced.

[0084] Another embodiment of the present invention provides a battery module including the power battery.

[0085] Specifically, the battery module provided by the present invention includes the power battery described above. During the assembly of the power battery, the spacer 16 provided by the present invention, on the one hand, clamps and limits the tab 9 on the battery cell 81 by allowing the tab 9 to pass through the gap 3, and utilizes the spacer 16 to fix the position of the battery cell 81 during assembly, thereby avoiding vibration problems during subsequent use of the power battery, and thereby effectively improving the stability of the positioning of the battery cell 81 in the shell; on the other hand, the side of the support portion 1 facing away from the battery cell 81 contacts with other assembly parts of the power battery, reducing the assembly gap 3, and the support portion 1 can also play a good supporting role in the assembly of the power battery, thereby avoiding squeezing of the tab 9 and the battery cell 81 by other assembly parts of the power battery; in addition, a liquid injection groove 4 and a non-liquid injection groove 5 are formed on the support portion 1 of the spacer 16. Compared with the setting of the liquid injection hole 83 in the prior art, the liquid injection groove 4 of the present application is simple and easy to operate. In addition, the setting of the non-liquid injection groove 5 for the circulation of gas inside the battery is conducive to exhaust and heat dissipation, which increases the safety performance of the power battery.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A spacer, characterized in that: The spacer includes two support parts symmetrically arranged along the center and a partition provided between the two support parts, wherein a gap is provided on the partition along its thickness direction for the tab of the power core to pass through, the support part includes a base plate and a plurality of grids provided on the base plate, the grids include a plurality of support plates provided on the top surface of the base plate and spaced apart along its length direction, and a side plate provided on the base plate to connect the plurality of support plates; The support plate is provided with a first vent hole, and a liquid injection groove connected to the liquid injection hole of the battery and a non-liquid injection groove not connected to the liquid injection hole of the battery are formed between two adjacent support plates and the side plate; The partition has two parallel first and second sides along its length, the side panels include a first side panel flush with the first side panel and a second side panel flush with the second side panel, and the second side panel is further provided with a second air vent between two adjacent support panels; The gap divides the partition into a first connecting plate located on the first side and a second connecting plate located on the second side. The first connecting plate is provided with a first chamfer at the bottom surface on the side opposite to the second connecting plate, and the second connecting plate is provided with a second chamfer at the bottom surface on the side opposite to the first connecting plate. The first chamfer is larger than the second chamfer.

2. A spacer according to claim 1, characterized in that: The distances between adjacent support plates of the grid are the same.

3. A spacer according to claim 1, characterized in that: The distances between adjacent support plates of the grid are different, and the distance between two support plates at the non-liquid injection groove is smaller than the distance between two support plates at the liquid injection groove.

4. A spacer according to claim 1, characterized in that: The base plate of the support part includes a horizontal plate and an inclined plate connecting the horizontal plate and the partition. The horizontal plate and the partition are arranged parallel to each other in the thickness direction. An avoidance area is formed between the inclined plate and the partition. The grille is arranged on the top of the horizontal plate and the inclined plate.

5. A spacer according to claim 4, characterized in that: The spacer further includes a liquid passage hole provided on the horizontal plate of the support portion.

6. A power battery, characterized in that: Comprising an integrated battery frame, a battery cell with a tab disposed in the integrated battery frame, and a spacer according to any one of claims 1 to 5 disposed in the integrated battery frame; The integrated battery frame includes a metal frame, poles arranged on the metal frame, an injection hole and an explosion-proof valve, and the spacer is located between the metal frame and the battery cell; the battery cell is provided with the pole ears at both ends along its length direction, and the pole ears pass through the gap and are welded and fixed to the poles of the integrated battery frame.

7. A power battery according to claim 6, characterized in that: The power battery further includes an insulating film disposed in the integrated battery frame and covering the outside of the battery core and connected to the spacer by thermal melting.

8. A battery module, characterized in that: Including the power battery according to claim 6 or 7.

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